Entries |
Document | Title | Date |
20080196966 | STEERING SYSTEM - A steering controller for an electric power steering device | 08-21-2008 |
20080217098 | Motor-driven power steering apparatus - In a motor-driven power steering apparatus, there is provided a correction coefficient memory previously storing an output correction coefficient to be multiplied by a current control signal applied to an electric motor at certain points in a range of temperatures in such a manner as to correct a temperature dependent output torque changing in dependence upon an environmental temperature of the electric motor to a demand output torque required in the electric motor. A temperature sensor for detecting the environmental temperature of the electric motor is provided, a correction coefficient computing circuit for reading the output correction coefficient corresponding to the temperature detected by the temperature sensor from the correction coefficient memory is provided, and a current control computing means for calculating a corrected current control signal by multiplying the current control signal of the electric motor computed on the basis of a steered condition of a vehicle by the output correction coefficient read from the correction coefficient computing circuit is provided. The drive control signal is output based on the corrected current control signal to the motor driving means. | 09-11-2008 |
20080217099 | Electric Power Steering Apparatus, Control Method Thereof and Program for Electric Power Steering Apparatus - It is an object to provide an electric power steering apparatus capable of preventing torque steer or deflection during braking, a control method thereof and a program for the electric power steering apparatus. An electric power steering apparatus controlling a steering assist motor | 09-11-2008 |
20080236934 | Electric Power Steering Apparatus - When a current input to a step-up voltage device of an electric power steering apparatus is equal to or higher than a first threshold current and an input voltage applied to the step-up voltage device is lower than a first threshold voltage, the step-up voltage device of the electric power steering apparatus discontinuously switches an output voltage to a voltage lower than a rated step-up voltage. When the input voltage becomes lower than a second threshold voltage which is lower than the first threshold voltage, the step-up voltage device sets the output voltage to a voltage equal to the input voltage. | 10-02-2008 |
20080251312 | Vehicle Steering Apparatus - In a vehicle steering apparatus of a steer-by-wire system, front wheels are controlled to be turned by a computer program processing. A displacement/torque conversion section | 10-16-2008 |
20080257635 | Magnetostrictive coat forming method, magnetostrictive torque sensor manufacturing method, and electric power steering apparatus employing the sensor - For forming an annular magnetostrictive coat on an outer peripheral surface of a rotational shaft associated with a magnetostrictive torque sensor, a magnetostrictive-coat forming method comprises a step of fitting a cylindrical masking jig over the outer peripheral surface of the rotational shaft and securing the masking jig to the outer peripheral surface, a step of placing the rotational shaft in a plating tank to thereby form the magnetostrictive coat by plating on the outer peripheral surface, and a step of detaching the masking jig from the rotational shaft. | 10-23-2008 |
20080264713 | Electric power assist module for steering system - An electric power assist module for a steering system has an integrated housing for accommodating the torque sensor, motor and electronic control unit. A helical gear train including a pinion gear, an intermediate gear and steering gear are provided to transfer the motion from the motor to an output shaft that is coupled to an input shaft by way of a torsion bar. | 10-30-2008 |
20080264714 | VARIABLE GEAR RATIO STEERING APPARATUS - A variable gear ratio steering apparatus has a steering operating member, a turning unit to turn a vehicle wheel and a gear ratio varying unit arranged between the steering operating member and the turning unit. The gear ratio varying unit comprises a differential gear mechanism, a gear ratio control motor and a steering torque assistance motor. The differential gear mechanism has a first internally toothed gear coupled to the steering operating member, a second internally toothed gear coupled to an input shaft of the turning unit and arranged coaxially with respect to the first internally toothed gear, at least one inside gear meshing with both the first and second internally toothed gears, and an inside gear support member rotatably supporting the inside gear. The gear ratio control motor is connected to the inside gear support part. The steering torque assistance motor is connected to the second internally toothed gear. | 10-30-2008 |
20080308342 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus for reducing disturbances caused by loads on a rack shaft is disclosed. The electric power steering apparatus performs compensation so as to obtain a value of zero for the deviation between a target rack travel distance computed by a target rack travel distance computation unit and an actual rack travel distance computed by a rack travel distance computation unit. Bringing the deviation close to zero reduces disturbances originating in the loads on the rack shaft. | 12-18-2008 |
20090014231 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus including a steering system into which steering torque is inputted, an electric motor for imparting steering assist force to the steering system, a controller for controlling a energizing state of the electric motor according to the steering torque, a terminal board electrically connected to the electric motor, and a control unit provided with a connector, wherein a mounting face of the electric motor with respect to the control unit, a mounting face of the terminal board with respect to the control unit, and a mounting face of the connector with respect to the control unit are arranged on a same plane. | 01-15-2009 |
20090020356 | STEERING DEVICE FOR FLOOR CLEANING MACHINE - A floor cleaning machine having a speed control and steering member which operates under operator-applied deformation thereof. The invention provides improved consumer convenience at steering and/or speed control. | 01-22-2009 |
20090026003 | VEHICLE STEERING APPARATUS - A vehicle steering apparatus | 01-29-2009 |
20090026004 | POWER STEERING APPARATUS HAVING FAILURE DETECTION DEVICE FOR ROTATION ANGLE SENSORS - A power steering apparatus has a steering power assisting system coupled to tire wheels and a variable gear transfer system coupled to a steering wheel. The steering power assisting system includes a torsion bar rotation sensor and a first actuator rotation sensor to calculate a first pinion angle and a second pinion angle based on the detected rotation angles, respectively. The variable gear transfer system includes a steering sensor and a second actuator rotation sensor to calculate a third pinion angle based on the detected rotation angles. Sensor failure is detected by comparing the calculated first, second and third pinion angles. | 01-29-2009 |
20090050400 | ELECTRIC POWER STEERING APPARATUS - The vehicle front side end portion of a lower column tube | 02-26-2009 |
20090065288 | ELECTRIC POWER STEERING APPARATUS - A controller samples a motor current value detected by a motor current detector at a sampling start timing for turning on a switching device to start holding in a motor current hold section, and fetches the motor current value held in the motor current hold section at a hold timing for turning off the switching device. The sampling start timing and the hold timing are variable. | 03-12-2009 |
20090071745 | CONTROL UNIT FOR ELECTRIC POWER STEERING APPARATUS - The present invention provides a high-performance control unit for an electric power steering apparatus structured such as to improve a steering feeling at a time of a control stop of the control apparatus by calculating a steering torque correction short-amount without stopping a function of a motor control signal monitoring means and applying an electromagnetic brake to the motor in correspondence to the steering torque correction short-amount even in the case of stopping a motor control during generation of a steering assist torque, lighten a load applied to a driver due to a rapid release of a tire torsion force at a time of stopping the assist, and prevent a driver from feeling an uncomfortable feeling. | 03-19-2009 |
20090078494 | Method for Compensating for Drive Influences on the Steering System of a Vehicle Using an Electric Power Steering System - The invention relates to a method for compensating for drive influences of a drive train of a motor vehicle on its steering system, said motor vehicle having an electric power steering system. A drive train simulation model which is integrated into the motor vehicle and permanently activated is used to determine disturbance variables from a driven behavior so that a compensation torque which counteracts the disturbance variables is generated for the power steering system. | 03-26-2009 |
20090095565 | Apparatus for controlling vehicle - Tire-uniformity components may generate a lateral force on a vehicle body, when the vehicle is in a turning movement. The lateral force may cause vibrations on the vehicle body. The controller controls a motor of an electric power steering system to modulate an assist torque acting on steerable wheels in accordance with the tire-uniformity components. The assist torque is modulated in the same direction as the lateral force. As a result, it is possible to reduce vibrations on the vehicle body, since the modulated assist torque avoids conflict with the lateral force and release the lateral force. | 04-16-2009 |
20090114471 | Electric power steering system - An electric power steering system which includes a torque detector for detecting a steering torque applied to a steering member and a steering assist brushless DC motor, whereby a plurality of phase currents are caused to flow to the brushless DC motor based on the steering torque detected by the torque detector so as to give steering assistance. A current detector for detecting each of the plurality of phase currents, an adder for adding up respective values of the currents detected by the current detectors and a determination device for determining whether or not a result of an addition by the adder falls outside a predetermined range are provided, whereby it is designed to determined as abnormal when the determination device determines that the result of the addition falls outside the predetermined range. | 05-07-2009 |
20090120714 | Electric Power Steering Apparatus - A electric power steering apparatus having a steering torque detecting unit for detecting a steering torque transmitted to the steering system; an electric motor for generating a steering assist force to give to the steering system; a motor control unit for controlling the electric motor based on at least the steering torque. The apparatus comprises a motor stop condition detecting unit for detecting a condition to stop the electric motor while the electric motor is under control by the motor control unit; and an electromagnetic brake control unit over the electric motor in order to suppress a kick-back based on at least either one of a steering condition of the steering system and a running condition of the vehicle when a detection result by the motor stop condition detecting unit shows that a condition occurs to stop the electric motor. | 05-14-2009 |
20090133956 | STEERING SYSTEM MOTOR - A plurality of magnetic pole bodies, provided on a stator of a steering motor, are divided into two electrically independent groups. Each group includes i) six magnetic pole bodies that are arranged in succession and ii) a corresponding number of magnetic pole bodies arranged opposing those six magnetic pole bodies. The two groups vibrate only slightly when operating normally. However, if one of the groups fails, vibration of the stator from elastic deformation in an undulating manner in the circumferential direction will increase, thereby alerting the driver of an abnormality in the steering motor. This increases the likelihood of measures being taken promptly to fix the abnormality in the steering motor, thus improving fail-safe performance. | 05-28-2009 |
20090139793 | Steering assist system for motorcycle - A steering assist system for a motorcycle includes an actuator configured to provide a steering torque to steering of a motorcycle. A target-torque calculation unit is configured to obtain a target-torque for the steering, on a basis of a state of the motorcycle. A torque detecting unit is configured to detect a steering torque. A torque control unit is configured to drive an actuator on a basis of a deviation between the target torque obtained from the target-torque calculation unit and the steering torque obtained from the torque detecting unit. | 06-04-2009 |
20090173566 | STEERING SYSTEM FOR VEHICLE - A steering system for a vehicle is disclosed. The steering system includes variable gear ratio steering apparatus, a first ECU for controlling the apparatus, an electric power steering apparatus, a second ECU for controlling the apparatus, The steering system further includes a steering wheel angle sensor and a steering wheel angle ECU, which are integrated. The steering wheel angle sensor detects a steering wheel angle of a steering wheel. The ECU calculates an estimation value of the steering wheel angle of the steering wheel and compare between the estimation value and the detected value of the steering wheel angle. Thereby, the ECU performs a process of determining detection accuracy of the steering wheel angle sensor. | 07-09-2009 |
20090188743 | Steering angle sensor - A steering angle sensor comprises a main rotor which can be rotated in a rotationally synchronous manner and which can be coupled to a steering column or to a steering wheel. The main rotor can be rotated about the rotational axis of the steering column. The steering angle sensor also comprises at least one additional rotor which can be driven by the main rotor, a first scanning unit which is used to scan the position of the rotational angle of the main rotor, and a second scanning unit which is used to scan the rotational angle of the additional rotor. The additional rotor can be rotated about the rotational axis of the steering column and can drive the additional rotor of at least one transmission element driven by the main rotor. A method for determining the absolute steering angle of a steering wheel is also disclosed. | 07-30-2009 |
20090188744 | Steering System and Method for Adapting Return Torque Relative to Hand Wheel Speed - A method for generating a return torque signal in an electric servo steering system of a vehicle, including the steps of: determining a current steering wheel position; determining a current vehicle speed; generating a return torque signal as a function of the steering wheel position and the vehicle speed; determining a current speed of steering wheel rotation; determining a scaling factor dependent on the speed of steering wheel rotation; and multiplying the return torque signal by the scaling factor in order to obtain a modified return torque signal. Also, a servo steering system which is designed to carry out such a method. | 07-30-2009 |
20090194363 | MATERIALS HANDLING VEHICLE HAVING A STEER SYSTEM INCLUDING A TACTILE FEEDBACK DEVICE - A materials handling vehicle is provided comprising: a frame comprising an operator's compartment; wheels supported on the frame, at least one of the wheels being a steerable wheel; a steer-by-wire system and control apparatus. The steer-by-wire system is associated with the steerable wheel to effect angular movement of the steerable wheel about a first axis. | 08-06-2009 |
20090200098 | ELECTRIC POWER STEERING DEVICE - In an electric power steering device, if the temperature of a specific site that increases due to the driving of a steering assist motor exceeds a threshold, the motor current is controlled to be equal to or below a current restriction value. The temperature Toff of the specific site detected when an engine is stopped, and the current restriction value Ioff provided when the engine is stopped are stored into a storage. A temperature difference Ta between the temperature detected when a starter switch is turned on and the temperature Toff is computed. If the temperature of the specific site when the starter switch is turned on is above the threshold, the current restriction value is set to be equal to or above the current restriction value Ioff stored in the storage, according to the temperature difference Ta, over a time following the turning-on of the starter switch. | 08-13-2009 |
20090200099 | ELECTRIC POWER STEERING CONTROL SYSTEM - An electric power steering control system for a vehicle that has a steering device coupled by a steering assembly to at least one tire steered by the steering device. The control system controls a current in a motor for generating torque applied to the steering assembly. The control system comprises a feed-forward component that generates a torque target signal representative of the torque applied by the motor to the steering assembly. The torque target signal is proportional to a multiplication of a steering torque from the steering device. There is also a sensor component that senses the motor current and provides a motor current signal. A motor control component receives the torque target signal and the sensed motor signal. The motor current signal is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal. | 08-13-2009 |
20090218163 | PRESSURE DETECTION DEVICE AND PRESSURE DETECTION METHOD - The pressure detection device includes a buffer member deformable by a pressure change, including one or more magnets, and a sensor assembly including one or more magnetic sensors to detect a variation of a magnetic field accompanied by deformation of the buffer member. | 09-03-2009 |
20090250289 | ELECTRIC POWER STEERING DEVICE - Provided are an electric power steering device which is capable of determining a failure without using a motor current, and an electric power steering device which removes any motor current detecting unit for detecting the motor current such as a shunt resistor, and suppresses the heat generation and the power loss in the device, thereby making it possible to realize the downsized device, a reduction in the costs, and the higher efficiency. An electric power steering device according to the present invention includes: a motor coupled with a steering system; a drive control unit for controlling a drive of the motor; a motor impression voltage detecting unit for detecting an applied voltage of the motor; and an abnormality determining unit for determining abnormality based on a comparison result of the detected motor impression voltage and an output voltage of the drive control unit. | 10-08-2009 |
20090266641 | ELECTRIC POWER STEERING SYSTEM - In an electric power steering system for a vehicle that controls a force that urges a steering wheel toward a neutral position thereof, a control unit ( | 10-29-2009 |
20090283354 | STEERING SYSTEM FOR VEHICLE - A vehicle steering system including: (a) a steering operation member; (b) a movement-amount variably transmitting device including: (b-1) a housing fixed to a vehicle body; (b-2) a differential mechanism including (i) a first element connected to the steering operation member, (ii) a second element movable relative to the first element, and (iii) a third element engaged with the first and second elements; and (b-3) a drive source for moving the third element, such that an amount of relative movement of the first and second elements is changeable depending on an amount of movement of the third element; and (c) a wheel turning device connected to the second element to turn a vehicle wheel. The movement-amount variably transmitting device further includes (b-4) a third-element-movement inhibiting device for inhibiting movement of the third element. The steering system further includes (d) a third-element-movement inhibition cancelling device for cancelling inhibition of the movement of the third element. | 11-19-2009 |
20090288907 | Electric Power Steering System, Controller, and Method of Operation - An electric power steering system for a vehicle includes a motor for providing assistance in turning the wheels of the vehicle. The motor is electrically connected to a controller. The controller includes a power device, such as a power transistor, electrically connected to the motor to variably provide electric power to the motor as needed. The controller also includes a gate drive device electrically connected to the power device for regulating operation the power device. A shutdown mechanism is electrically connected between the gate drive device and a power input. In the event of a fault, the shutdown mechanism isolates electrical power from the gate drive device. This prevents the power device from providing electric power to the power steering motor. | 11-26-2009 |
20090294206 | Reducing The Effects Of Vibrations In An Electric Power Steering (EPS) System - The system and method described herein can be used to reduce the effects of periodic vibrations in an electric power steering (EPS) system for a vehicle, particularly, those that can lead to smooth road shake (SRS), torsional nibble, and/or other undesirable conditions. According to an exemplary embodiment, an electric motor is used to purposely generate counter-acting vibrations in the EPS system to cancel out the periodic vibrations generated by the wheel assemblies or corners. | 12-03-2009 |
20090294207 | Motor-Driven Power Steering System - According to the present invention, unlike to motor-driven power steering systems in the related art, it is possible to generate an appropriate assistant steering force that is required to drive the motor according to steering of the driver, without expensive components, such as a torque sensor and an electronic controller, such that it is possible to achieve a motor-driven power steering system having a simple structure at a low cost. | 12-03-2009 |
20090294208 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus is configured in such a way as to include a first filtering unit that applies filtering processing to the detected steering torque signal and outputs the processed torque signal; a control unit that generates and outputs a motor drive signal, based on a steering torque signal outputted from a first filtering unit; a second filtering unit that applies filtering processing to the detected steering torque signal and outputs the processed torque signal; and an interlock unit that generates and outputs a motor drive inhibition signal, based on the steering torque signal outputted from the second filtering unit. The second filtering unit performs filtering processing in such a way as to output a steering torque signal the same as or similar to the steering torque signal that is outputted from the first filtering unit at least when a vehicle is in a predetermined driving condition. | 12-03-2009 |
20090294209 | Method and Device for Operating a Vehicle with a Steering System, and a Steering System - A steering system arranged in a vehicle having a steering wheel, a steering system control unit and a steering assistance unit with an electric motor. The steering system is designed to assist, by the motor of the steering assistance unit, a predefined steering movement of a driver at the steering wheel for steering steerable wheels of the vehicle and to steer the steerable wheels in accordance with the predefined steering movement. In this context, the steering wheel is mechanically coupled to the steering assistance unit. The steering system is also designed to block a predefined steering movement at the steering wheel, and therefore to block steering of the steerable wheels by the steering assistance unit, in a predefined state of rest of the vehicle. | 12-03-2009 |
20090308683 | IN-VEHICLE ELECTRONIC CONTROL APPARATUS AND STEERING CONTROL SYSTEM - An electric power steering system includes a multi-phase electric motor, an inverter connected to the rotary electric machine and an electronic control apparatus. One phase of the motor is pulled up by a resistor. The electronic control apparatus detects disconnection abnormality between the motor and the inverter by checking phase voltages of the inverter by stopping the inverter operation. If disconnection is detected, current is supplied to the remaining normal two phases. The electronic control apparatus detects short-circuit abnormality by checking an electric angle (rotation angle) of the motor. | 12-17-2009 |
20090314573 | Magnetostrictive Torque Sensor and Electric Steering System - A magnetostrictive torque sensor comprising: a magnetostrictive film provided on a ferromagnetic shaft; a bias magnetization device which applies a bias magnetic field to the shaft to magnetize the shaft; and a detection device which detects a change in magnetism of the magnetostrictive film, wherein: a torque acting on the shaft calculated based on the detection results of the detection device; and the bias magnetization device applies a bias magnetic field to the shaft at a predetermined timing. | 12-24-2009 |
20100044146 | ELECTRIC POWER STEERING DEVICE - An electric power steering device, including an electric motor supplied with power from a power supply device to generate a predetermined steering assistance force for a steered wheel, and an assistance control device the controls the amount of electrical power supplied to the electric motor, according to the steering state of a steering wheel. The assistance control device detects the power supply voltage of the power supply device. The assistance control device controls the electrical current supplied to the electric motor, so as to maintain the power supply voltage greater than or equal to a set voltage which is set in advance. | 02-25-2010 |
20100071988 | Apparatus for use in turning steerable vehicle wheels - An approved apparatus ( | 03-25-2010 |
20100084216 | POWER SUPPLY CIRCUIT AND SIGNAL DETECTION APPARATUS - In a power supply circuit, first and second loads are connected in parallel to a power source though first and second power lines, respectively. A power line connector connects the first and second power lines together in such a manner that even when one of the first and second power lines is broken, the first and second loads are supplied with electric power from the power source through the other of the first and second power lines. A rectifier device is connected to each of the first and second power lines between the power source and the power line connector. The rectifier device allows an electric current in a direction from the power source to the first and second loads and blocks the electric current in opposite direction. | 04-08-2010 |
20100108432 | STEERING CONTROL DEVICE - The steering control device performs a control of applying an assist torque based on a steering by a driver. Concretely, the steering control device sets a transfer function from an inputted steering angle to a wheel turning angle to a predetermined frequency response. Then, the steering control device determines the assist torque corresponding to a steering amount based on the frequency response, a transfer function of the steering angle in a relational formula between the steering angle, the wheel turning angle and the assist torque, and a transfer function of the assist torque in the relational formula. By executing the steering assist based on the determined assist torque, it becomes possible to control the response of the wheel turning angle to the steering angle with high accuracy. | 05-06-2010 |
20100126795 | Electric power steering apparatus for vehicles - While a steering angle speed which represents a steering speed of the steering wheel is equal to or smaller than a predetermined speed, i.e., while the vehicle is making a steady turn with the steering wheel being held at a given angle or while the vehicle is running straight, when the rate of change of a rack load calculated by a rack load rate-of-change calculator becomes equal to or greater than a predetermined value, an EPS motor is supplied with a corrective current or which serves as a corrective signal for a drive signal in a direction to cancel out the rate of change of the rack load. | 05-27-2010 |
20100181140 | ELECTRIC POWER STEERING APPARATUS - A rotational angle sensor used in an electric power steering apparatus detects a rotational angle of a motor shaft at a portion on a steering system side, as a motor rotational angle (θm). A MPU sets a base correction amount (Δθ′m) based on a q-axis actual current value (Iq). The MPU sets a rotational angle correction amount (Δθm) used to correct the motor rotational angle (θm) by decreasing the base correction amount (Δθ′m) as a rotational angular speed (ω) increases and by increasing the base correction amount (Δθ′m) as a torque differential value (dT/dt) increases. | 07-22-2010 |
20100206657 | POWER STEERING DEVICE FOR A SADDLE-RIDDEN VEHICLE - To suppress temperature rises of an electric power steering device provided at a vehicle equipped with a diff lock device and to restrict the operation of the electric power steering device at times other than during diff locking. An electric power steering device that is coupled to a steering shaft fitted with handlebars at an upper end and that generates auxiliary force that supplements the steering force, and a diff lock unit that selects a differential state and a non-differential state (diff lock) of a differential device are provided. An ECU reduces the maximum value of the auxiliary force generated by the electric power steering device to a prescribed limit value when the diff lock is detected by the diff lock sensor is also provided. The ECU releases limiting of the maximum value of the auxiliary force when release of the diff lock is detected by the diff lock sensor. | 08-19-2010 |
20100252355 | VEHICLE STEERING SYSTEM - In a steering system for a vehicle incorporated with a rear drive electric motor ( | 10-07-2010 |
20100263962 | MAGNETOSTRICTIVE TORQUE SENSOR AND ELECTRIC POWER STEERING APPARATUS - A magnetostrictive torque sensor includes a rotatable shaft rotatably supported by bearings, a magnetostrictive film disposed on the surface of the rotatable shaft, and a detecting coil that detects a change in a magnetic property of the magnetostrictive film. A hollow cylindrical ring is press-fitted over and fixed to the rotatable shaft near the magnetostrictive film, for example, near the right end of the magnetostrictive film. | 10-21-2010 |
20100288577 | MOTOR FOR ELECTRIC POWER STEERING DEVICE WITH INTEGRATED CONTROLLER AND ELECTRIC POWER STEERING DEVICE - A motor for an electric power steering device with an integrated controller ( | 11-18-2010 |
20100294586 | ELECTRIC POWER STEERING APPARATUS - When stopping operation of an electric power steering apparatus, a motor relay is kept in an on-state even after a power supply relay is in an off-state. A drive control portion sets a target value of a d-axis current to a value other than zero and sets a target value of a q-axis current to zero, and performs a processing same as that at the time of rotating a motor. MOS-FETs contained in a motor driving circuit are controlled such that each of driving currents of the two phases or more is not zero and the brushless motor does not rotate even supplied with these driving currents. Electric charge accumulated in a capacitor is discharged via the MOS-FETs each in an on-state, a motor relay and the windings of the brushless motor. The electric charge accumulated in the capacitor may be discharged via the excitation coil of the motor relay. | 11-25-2010 |
20100326763 | METHODS OF RETROFITTING ELECTRIC POWER STEERING SYSTEMS FOR VEHICLES - A method for retrofitting an electric power steering system for a vehicle, the electric power steering system comprising a torsion bar and a controller configured to facilitate steering control based at least in part on a deflection or a strain of the torsion bar, is provided. The method includes the steps of obtaining the electric power steering system, and reconfiguring the controller so as to be further configured to at least facilitate adjusting a stiffness of the torsion bar based at least in part on a parameter pertaining to operation of the vehicle. | 12-30-2010 |
20110000738 | ELECTRIC POWER STEERING DEVICE - An electric motor ( | 01-06-2011 |
20110024224 | ELECTRIC POWER STEERING SYSTEM - In an electric power steering system, when a motor rotation angular speed ω and a motor rotation angular acceleration α of a steering assisting motor both exceed corresponding predetermined values ωs and αs, respectively, an abnormal external force application-determining section determines that an external force equal to or greater than a predetermined value is applied to a steering mechanism, and sets an abnormal external force application determination flag (FLG) to 1. When the abnormal external force application determination flag (FLG) is 1, a d-axis electric current command value-calculating section activates a motor rotation angular speed-reducing section and performs field-strengthening control based on a motor rotation speed/d-axis electric current command value map. | 02-03-2011 |
20110036660 | VEHICLE STEERING CONTROL DEVICE - An object of the present invention is to reduce the possibility of a power assistance failure because of the phenomenon that steering assisting power which an electric power steering unit can generate is lower than the steering assisting power which is required for the electric power steering unit. A vehicle steering control device comprises an electric power steering unit, a steering ratio varying unit which drives an output member relative to an input member driven by steering operation of a driver to vary a steering ratio, and a control means which controls the steering ratio varying unit. The control means decreases in magnitude the relative drive velocity of the output member driven by the steering ratio varying unit relative to the input member when the magnitude of a difference between the maximum value of the steering drive velocity range of said steerable wheels which allows said power steering unit to generate a required steering assisting power and an actual steering drive velocity of said steerable wheels is small in contrast to the large difference. | 02-17-2011 |
20110048840 | VEHICLE HAVING A VARIABLE ASSIST POWER STEERING ASSEMBLY - A wheeled vehicle ( | 03-03-2011 |
20110067947 | MAGNESTOSTRICTIVE TORQUE SENSOR AND MANUFACTURING METHOD THEREOF, AND ELECTRIC POWER STEERING SYSTEM - A magnestostrictive torque sensor | 03-24-2011 |
20110094821 | ELECTRICAL POWER SUPPLY UNIT FOR VEHICLE - An electrical power supply unit for vehicle comprises: a Main Power Supply | 04-28-2011 |
20110127104 | VEHICULAR STEERING APPARATUS - A vehicular steering apparatus includes: a road-wheel turning mechanism mechanically separated from, but electrically connected to a steering wheel; a first rotation shaft connected to the steering wheel; a second rotation shaft connected to the road-wheel turning mechanism; and a connection mechanism for interconnecting the first and second rotation shafts in such a manner that the first and second rotation shafts can rotate idle relative to each other within a range of a predetermined relative rotational angle. | 06-02-2011 |
20110214934 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - In a motor control device, a control calculation unit obtains a phase voltage instruction value. A current detecting unit detects an electric current which flows into the brushless motor. A rotational position detecting unit detects the rotational position of a rotor in the brushless motor. A correction unit corrects the phase voltage instruction value based on the detection results of the current detecting unit and the rotational position detecting unit so that a dependency of a ratio on an electric angle shown by a secondary harmonic component of the ratio concerning the electric angle of the brushless motor. The ratio is a ratio of a q-axis or d-axis component of the electric current, which flows into the brushless motor, to a q-axis or d-axis instruction value. A driving unit drives the brushless motor based on the phase voltage instruction value after the correction by the correction unit. | 09-08-2011 |
20110232988 | TORQUE DETECTOR AND ELECTRIC POWER STEERING SYSTEM - A torque detector includes a sensor unit including a single magnetic sensor capable of detecting a change of flux, a torque detecting unit that detects torque based on an output of the sensor unit, and a magnetic field generator capable of generating a magnetic field in an area including the sensor unit. The torque detecting unit has a failure detecting mode that detects an abnormality of the sensor unit based on an offset amount of the output of the sensor unit. The offset amount is obtained when the magnetic field is generated by the magnetic field generator. | 09-29-2011 |
20110240400 | ELECTRIC POWER STEERING SYSTEM - An electric power steering system includes a steering wheel, a rack-and-pinion type steering gear box connected to the steering wheel, a steering torque sensor, a pinion shaft, and a steering actuator mounted on the pinion shaft to assist a steering operation conducted by a driver. An overload preventing control is conducted so that a sum of a torque conversion value of an assist current and a steering torque detected by the steering torque sensor equal a predetermined threshold value. When the steering gear box has reached a stroke end, and the assist current or the steering torque is smaller than a predetermined threshold value, the overload preventing control is conducted using a threshold value that is less than the predetermined threshold value. | 10-06-2011 |
20110272205 | ELECTRIC POWER STEERING DEVICE - An electric power steering device for a vehicle includes an estimation mechanism estimating if there is a possibility that a backward electric current flows in a booster circuit toward a vehicle battery device, and a boosting controller stopping the boosting operation of the booster circuit to prevent a backward electric current from flowing in the booster circuit when it is estimated that there is a possibility that a backward electric current flows by the estimation mechanism. The estimation mechanism estimates that there is a possibility that a backward electric current flows in the booster circuit when the steering condition of a steering wheel is a returning condition or a steering-held condition. Otherwise, the estimation mechanism estimates if a backward electric current flows on the basis of input and output voltages of the booster circuit and information on the switching of a first boosting switching element. Thereby, overheat of the booster circuit can be prevented. | 11-10-2011 |
20110297475 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - A motor control device and an electric power steering system that make it possible to suppress occurrence of voltage saturation with a simple configuration are provided. A current limiting value computing unit computes a current limiting basic value of which the value is lower as a rotation angular velocity of a motor increases, and computes a voltage gain of which the value is smaller as a power voltage value, detected by a first voltage sensor provided at an electric power line that constitutes an electric power supply line to the motor, decreases. In addition, the current limiting value computing unit computes a difference between a control voltage value, detected by a second voltage sensor provided at a control line independent of the electric power line, and the above power voltage value, and computes an output gain of which the value is smaller as the difference increases. Then, by multiplying the output gain by the current limiting basic value together with a voltage gain, a current limiting value is computed. | 12-08-2011 |
20110315470 | Motor drive apparatus and method, and electric power steering system using the same - When an inverter or a coil set of one system fails in a motor drive apparatus having two power supply systems, a power supply relay of a failing system is turned off. In this case, while a travel speed detection value is less than a predetermined threshold value, current supply to a motor by the other system operating normally is stopped to thereby stop driving of the motor and generate no steering assist torque. Thus, a driver will be caused to surely notice occurrence of failure. | 12-29-2011 |
20120006612 | ELECTRIC POWER STEERING SYSTEM - An electric power assisted steering system comprises a torque sensor, a motor connected to a part of the steering assembly to provide an assistance torque to the steering assembly and a motor controller which is adapted to receive an output signal from the torque sensor and to generate a motor torque demand signal indicative of the torque to be applied by said motor to said steering system. The motor torque demand signal comprises a driver demand component with a value dependent upon the value of said handwheel torque applied by the driver; and a diagnostic component with a value independent of said handwheel torque applied by said driver and which varies in value over time in a predetermined manner. The system further comprises a monitor that correlates the diagnostic component with the output signal and generates a signal indicating that the output signal is faulty if the correlation between the two correlated signals falls outside of a predefined range. | 01-12-2012 |
20120031697 | Motor and electric power steering apparatus using motor - A magnetic sensor disposed in an axial direction of a shaft of a motor detects the rotation angle of the rotor by detecting magnetism of the magnet that is disposed on one end of the shaft. A first and second conducting wires extend in parallel with an axis of the shaft, and are equidistantly positioned relative to the axis, on a virtual circle that has a center point on the axis of the shaft. The electric current flowing in the first conducting wire and the electric current flowing in the second conducting wire have the same magnitude and the same flow direction with each other at any time. When the first conducting wire and the second conducting wire are on opposite sides relative to the center point of the virtual circle, the magnetic fields around the conducting wires cancel with each other, thereby enabling accurate detection of the rotation angle. | 02-09-2012 |
20120055731 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus including a motor includes: a steering torque sensor; a speed sensor; an auxiliary steering force setting unit configured to output a signal representing a linear change of a gradual increase or decrease; a map setter configured to receive a signal output from the auxiliary steering force setting unit and to set an auxiliary steering force map where a maximum steering torque, a maximum target motor current, or a ratio of a target motor current to a steering torque at a specific speed gradually increases or decreases; a current signal supply configured to output the steering torque signal and a target motor current signal corresponding to the speed signal according to the auxiliary steering force map; and a motor driving unit configured to supply a current corresponding to the target motor current signal to the motor. | 03-08-2012 |
20120055732 | ELECTRIC POWER STEERING SYSTEM - An electric power steering system includes a motor that applies assist force to a steering system, and updates a motor resistance (Rm) that is a value indicating a resistance of the motor. Specifically, the motor resistance (Rm) is updated on the basis of the fact that an induced voltage (EX) of the motor is smaller than a first determination value (GA). In addition, when the induced voltage (EX) is smaller than or equal to a second determination value (GB), a divided value that is obtained by dividing a motor voltage (Vm) by a motor current (Im) is set as a new motor resistance (Rm). | 03-08-2012 |
20120061169 | METHODS, SYSTEMS AND APPARATUS FOR STEERING WHEEL VIBRATION REDUCTION IN ELECTRIC POWER STEERING SYSTEMS - Methods, system and apparatus are provided for suppression of steering wheel vibrations generated by an electric power steering system of a vehicle. A feedback controller is provided that extracts information from ABS pulse trains communicated over the vehicle's LAN to generate estimates of instantaneous tire position and angular velocity. The estimated tire position is used to generate carrier signals. The carrier signals are then processed with a measured dynamic disturbance signal to extract periodic content of the torque sensor. The estimated tire frequency is applied to a stored inverse motor drive-to-sensor torque transfer function to generate gain and phase adjustments that, along with the extracted periodic content of the torque sensor, can be applied to carrier signals to generate a gain-and-phase-compensated motor drive signal. The gain-and-phase-compensated motor drive signal is fedback to the electric motor to suppress the periodic content in the output signal of the torque sensor to suppress vibrations at the vehicle's steering wheel. | 03-15-2012 |
20120061170 | MOTOR-DRIVEN STEERING ASSIST APPARATUS - In a motor-driven steering assist apparatus, a gear train transmitting a rotation of an electric motor to an output shaft comprises a single unit body surrounded by housings, and an attaching boss to a vehicle body side bracket is provided in a lower surface of the housing as seen from an axial direction of the output shaft. | 03-15-2012 |
20120061171 | FACTORY STEERING RACK CENTERING AND PREVENTING PINCH POINTS USING ELECTRIC POWER STEERING SYSTEM - A method is provided for centering a steering rack in an automotive vehicle, particularly a vehicle that includes an electric power steering (EPS) system. The centering method includes locating a center by using an electric motor of the EPS system. The method includes temporarily locking the steering rack in place and subsequently installing a steering wheel to a steering column. An on-board processor or ECU of the automotive vehicle determines or locates the center of the rack by detecting the first and second ends of the rack when at least one of a velocity of the electric motor reaches zero, a current of the electric motor reaches a preselected level, and steering angle of the electric motor stabilizes. The method monitors potential pinch point zones and reverses turning of the tires upon reaching the pinch threshold level and the automatic centering process is terminated. | 03-15-2012 |
20120080259 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING APPARATUS - An angular velocity estimate (ωe) used in motor control of an electric power steering is obtained as follows. In a first state period during which the motor substantially stops its rotation, a resistance calculation unit calculates a motor resistance value (Rc) on the basis of a detected value (Vm) of motor voltage and a detected value (Im) of motor current. An average calculation unit obtains an average value (Rav) of the calculated resistance values (Rc) in a retained period. A current-resistance characteristic that associates motor current with motor resistance is held in a characteristic holding unit, and a characteristic updating unit updates the current-resistance characteristic on the basis of the average value (Rav). An estimate calculation unit calculates the angular velocity estimate (ωe) on the basis of the detected value (Vm) of motor voltage, the detected value (Im) of motor current and a motor resistance value (Rm) obtained from the current-resistance characteristic. | 04-05-2012 |
20120090913 | ELECTRIC POWER STEERING SYSTEM - A controller applies slight rotational torque to a drive gear of a reduction mechanism also in a predetermined range in which a motor does not produce any steering operation assist force. That is, the motor is caused to produce slight rotational torque not enough to drive a driven gear, and the rotational torque direction is reversed under a given condition. Accordingly, a backlash between the drive gear and the driven gear is eliminated. | 04-19-2012 |
20120111658 | VEHICULAR STEERING CONTROL APPARATUS - A vehicular steering control apparatus has a steering direction control device and a reaction force application device. The steering direction control device controls a steering angle of steered wheels by controlling a steering direction control motor based on a steering wheel angle. The reaction force application unit is provided more closer to a steering wheel than the steering direction control device is and has a differential reduction unit and a reaction force application motor. The differential reduction unit transfers rotation of an input shaft to an output shaft. The reaction force application motor drives the differential reduction unit. The steering wheel and the steered wheels are normally linked mechanically, so that no fail-safe device is needed. | 05-10-2012 |
20120138381 | STEERING DEVICE FOR AN ELECTRIC VEHICLE - A steering device includes: a main body mounted on an electric vehicle; a pivot axle unit mounted rotatably to the main body and having opposite rod portions extending outwardly and respectively from opposite lateral sides of the main body; a control unit coupled to the pivot axle unit for generating a control signal associated with forward or rearward movement of the electric vehicle in response to rotation of the pivot axle unit relative to the main body; and an operating unit operable to drive rotation of the pivot axle unit and including two mounting members that are connected respectively to the rod portions of the pivot axle unit, and a connecting member interconnecting the mounting members. Each mounting member has radially extending operating rods. | 06-07-2012 |
20120145472 | Electric Power Steering Device - An an electric power steering device which, when an abnormality occurs in one phase of a three-phase brushless motor, permits continuous driving of the motor using the remaining two phases without deteriorating the steering feeling. When a power distribution abnormality of a drive system of one phase of respective phase coils has been detected by an abnormality detection section, an abnormal-time phase current instruction value for using the remaining two phase coils is calculated based on a steering assist electric current instruction value, and an electric motor is driven based on that abnormal-time phase current instruction value. At that time, when an electrical angle falls within an acceleration region, the abnormal-time phase current instruction value is increased or decreased for correction in order to accelerate rotation of the three-phase brushless motor in a steering direction. | 06-14-2012 |
20120145473 | MOTOR DRIVE APPARATUS AND ELECTRIC POWER STEERING SYSTEM USING THE SAME - A booster circuit of a motor drive apparatus has at least two sub-booster circuits connected in series. Each sub-booster circuit includes a booster coil, a boosting switching element, a reducing switching element and an output capacitor, and outputs, by boosting an input voltage, a boosted output voltage. The booster circuit | 06-14-2012 |
20120152647 | TORQUE SENSOR, TORQUE DETECTOR, AND ELECTRIC POWER STEERING DEVICE - In a torque sensor, a torque signal and a monitoring signal have values between a first lower limit and a first upper limit. A limiting section changes the torque signal to a second lower limit when the torque signal is equal to or less than the second lower limit that is greater than the first lower limit, and changes the torque signal to a second upper limit when the torque signal is equal to or greater than the second upper limit that is less than the first upper limit. When abnormality has occurred in the torque signal, an output section transmits a first fault notification signal that is a value between the first and second lower limits or a second fault notification signal that is a value between the first and second upper limits. | 06-21-2012 |
20120175183 | ELECTRIC POWER STEERING APPARATUS | 07-12-2012 |
20120199414 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus includes a motor control unit for controlling an electric motor operatively connected to a steering shaft. The motor control unit includes a first control unit for controlling a steering torque detected by a torque detecting unit so as to bring the steering torque to zero or to a first predetermined value, and a second control unit for controlling the steering torque detected by the torque detecting unit so as to bring the steering torque to a second predetermined value which is greater than zero or than the first predetermined value, based on an operational quantity detected by an operational-quantity detecting unit or a quantity representative of a vehicle behavior detected by a vehicle-behavior detecting unit. The motor control unit controls the electric motor based on an output signal from the first control unit and an output signal from the second control unit. | 08-09-2012 |
20120205185 | ELECTRIC POWER STEERING SIMULATED TRAVEL STOPS - A control system for controlling a steering system is provided. The control system includes a first module that determines a position control value based on a handwheel position. A second module generates a torque command based on the position control value to simulate an end of travel stop in the steering system. | 08-16-2012 |
20120205186 | ELECTRIC POWER STEERING SYSTEM - An electric power steering system calculates a motor resistance Rm using a resistance map, and calculates an estimated inducted voltage based on a motor current and a motor voltage. If the estimated induced voltage is determined as being equal to or smaller than a determination value that is set in accordance with the current level, the electric power steering system calculates a motor resistance (estimated motor resistance Rma) and updates the resistance map based on the estimated motor resistance Rma. | 08-16-2012 |
20120205187 | ELECTRIC POWER STEERING SYSTEM - An inverter energy consumption calculating portion estimates the actual power consumption of a steering operation assist motor after an engine is placed in an idle-stop state, and a command value of current to be supplied to the steering operation assist motor is limited such that the command value is smaller as the energy consumption is larger. The inverter energy consumption calculating portion calculates the energy consumption of an inverter drive circuit by integrating an amount of electric power consumed by the drive circuit. | 08-16-2012 |
20120211299 | ELECTRIC POWER STEERING APPARATUS - An electrical angle estimation section calculates an estimative electrical angle on the basis of an inductive voltage generated in a motor, and obtains an estimative electrical angle by correcting the estimative electrical angle by an electrical angle correction amount. On the basis of a detection value which represents the difference in electrical angle between the q-axis and the δ-axis calculated by an electrical-angle-error detection section, an electrical-angle-correction-amount computation section calculates an electrical angle correction amount such that the electrical angle of the δ-axis falls within a prescribed angular range, which lags behind the q-axis in terms of electrical angle. Thus, when sensorless control is performed, a phenomenon in which the motor loses synchronism can be restrained. | 08-23-2012 |
20120217086 | ANTI-CORROSION ELECTROMECHANICAL POWER STEERING - The invention relates to an electrically driven or supported steering system having a steering housing ( | 08-30-2012 |
20120241246 | ELECTRIC POWER STEERING DEVICE - An electric power steering device includes a first housing that supports an output shaft rotatable together with a driven member with a first bearing placed there between and a second housing that rotatably supports a driving member. The first housing includes an eccentric engagement section that is eccentric with respect to a first bearing holding section holding the first bearing. The eccentric engagement section is fitted to an engagement section of the second housing. When the center-to-center distance between the driving member and the driven member is adjusted, the eccentric engagement section of the first housing is rotated with respect to the engagement section of the second housing. | 09-27-2012 |
20120261209 | TORQUE SENSOR AND POWER STEERING SYSTEM - First and second shafts are connected with each other through a torsion bar and arranged to rotate relative to each other within a relative rotational angle range A. A s torque sensor includes first and second resolvers for sensing the angular potions of the first and second shafts, respectively. The first resolver produces a periodical first resolver output signal so that the number X | 10-18-2012 |
20120273293 | ELECTRIC POWER STEERING APPARATUS - As a quotient, which is produced when the value of an assistive current for causing an electric motor to generate an assistive torque is divided by the value of a steering torque detected by a steering torque sensor, becomes greater, a greater phase-lag compensation (smaller phase-lead compensation) is performed on the steering torque detected by the steering torque sensor. Within a region in which the steering sensation is reduced, a greater phase-lead compensation is performed. | 11-01-2012 |
20120273294 | POWER STEERING SYSTEM AND METHOD FOR ASSEMBLING THE POWER STEERING SYSTEM - A power steering system having a housing having first and second housing sections, a steering shaft rotatably housed in the housing, a sensor coil, a coil bobbin having a coil holding part and a flange part and housed in the first housing section, a first held section provided at the flange part, a sensor board housed in the housing, a second held section provided at the sensor board, first and second riveting portions provided at the first housing section, and an electric motor. The first riveting portion fixes the coil bobbin to the first housing section by melting and deforming the first riveting portion with the first held section touching the first riveting portion. The second riveting portion fixes the sensor board to the first housing section by melting and deforming the second riveting portion with the second held section touching the second riveting portion. | 11-01-2012 |
20120312627 | ELECTRIC POWER STEERING DEVICE - Disclosed is an electric power steering device capable of applying a prescribed steering assist force to a steering assembly, even when a torque sensor is out of order and the electric power steering device is in a state of being unable to sense steering torque by the torque sensor. Using an angle of rotation of a rotating element, which is detected by a resolver that serves as a rotating element angle of rotation sensing unit of a motor, a steering angle and a steering angular velocity are estimated, and a prescribed steering assist force is applied to a steering assembly by the motor, on the basis of an estimated steering angle and/or an estimated steering angular velocity. | 12-13-2012 |
20120318603 | STEERING APPARATUS FOR TURNING MULTIPLE SETS OF STEERABLE VEHICLE WHEELS - A steering apparatus ( | 12-20-2012 |
20130001006 | Method for Supplying Power to an Electrically Assisted Steering System - A method for supplying power to an electrically assisted steering system is described. In one example, the method adjusts alternator field current to increase energy supplied to the electrically assisted steering system in response to an automatic engine stop request. The method may improve operation of the electrically assisted steering system. | 01-03-2013 |
20130056294 | STEERING DEVICE FOR A VEHICLE - The invention relates to a steering device for a vehicle, comprising a steering drive ( | 03-07-2013 |
20130062137 | Electric Power Steering System - An electric power steering system has an electric motor that is housed in a motor housing having a cylindrical portion and provides a steering assist force to a steering shaft; a control unit that controls the electric motor and has an ECU housing located on an opposite side to an output shaft of the electric motor in an axial direction of the motor housing; a power conversion circuit housed in the ECU housing and having a semiconductor switch for controlling the electric motor; and a control circuit housed in the ECU housing and controlling the semiconductor switch. The electric power steering system also has a conductive member that electrically connects an output terminal of the semiconductor switch and an input terminal of the electric motor. Part of a metal board of the conductive member is contiguous to an inner surface of the motor housing or of the ECU housing. | 03-14-2013 |
20130062138 | ROTATING ELECTRICAL MACHINE CONTROL DEVICE AND STEERING CONTROL SYSTEM - A rotating electrical machine control device includes a target current value calculation section, a PWM signal generation section, a voltage application section, and a control section. The target current value calculation section calculates target current values of electric currents supplied to windings of a rotating electrical machine. The PWM signal generation section generates PWM signals for the respective windings based on the target current values. The voltage application section applies voltages to the respective windings based on the PWM signals. When the control section stops driving of the rotating electrical machine, the PWM signal generation section generates the PWM signals in which a timing of a pulse change in the PWM signal of at least one phase is different from timings of pulse changes in the PWM signals of the other phases. | 03-14-2013 |
20130075191 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus includes: a detector that detects a value corresponding to a steering torque of a steering wheel; a correcting unit that corrects a detection value detected by the detector by taking into account a hysteresis between an actual steering torque and the detection value detected by the detector; and a target current calculating unit that calculates a target current which is supplied to an electric motor on the basis of a corrected detection value corrected by the correcting unit. The correcting unit makes a correction by using a correction value corresponding to the detection value detected by the detector so as to make the hysteresis small in a case where the steering torque is small and large in a case where the steering torque is large. | 03-28-2013 |
20130112494 | TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM - A torque detection device includes: a torsion bar that couples a first shaft to a second shaft such that the first shaft and the second shaft are rotatable relative to each other; an annular magnet that is fixed to the first shaft; a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face the magnet; and Hall ICs. Each of the magnetic yokes has a plurality of lugs arranged at equal intervals in a circumferential direction, and each lug becomes narrower toward its distal end, and has a curved profile with rounded corners when viewed from a radial direction of the corresponding magnetic yoke. | 05-09-2013 |
20130140105 | PINION SENSOR ASSEMBLY, PINION SENSOR COVER ASSEMBLY, AND ELECTRONIC POWER STEERING APPARATUS HAVING THE SAME PIPE - Disclosed are a pinion sensor assembly and an electric power steering apparatus having the same. According to the present invention, it is possible to substantially reduce the number of constitutional elements to be assembled when assembling a torque sensor and neighboring elements, to reduce an error in change of torque caused by accumulation of assembling errors of the constitutional elements, thereby preventing a malfunction, and to enhance assemblability. | 06-06-2013 |
20130161116 | STEERING SYSTEM - In a steering system, an operation mechanism that includes an operation member includes: a steering angle sensor that detects a steering angle of the operation member; and a steering direction detection unit that detects a steering direction of the operation member. The steering direction detection unit includes: a threaded shaft that is rotatable in the steering direction of the operation member; a nut that is screwed to the threaded shaft; a nut guide that causes the nut to move in accordance with rotation of the threaded shaft; a stopper that prevents movement of the nut beyond a predetermined position; a proximity detection sensor that detects a fact that the nut is in proximity to the stopper; and a variable axial length mechanism that reduces a clearance between the nut and the stopper in response to occurrence of a malfunction in the steering angle sensor. | 06-27-2013 |
20130161117 | STEERING SYSTEM - A steering system includes: an operation mechanism that includes an operation member used to perform a steering operation; and a steered mechanism that is not mechanically coupled to the operation mechanism, and that steers a wheel based on the steering operation of the operation member. The operation mechanism includes a steering angle sensor that detects a steering angle of the operation member, and steering direction detection unit that detects only a steering direction of the operation member. | 06-27-2013 |
20130161118 | STEERING SYSTEM - A steering system includes: an operation mechanism that includes an operation member; and a steered mechanism that is not mechanically coupled to the operation mechanism and that steers a wheel on the basis of a steering operation of the operation member. The operation mechanism includes a steering angle sensor that detects a steering angle of the operation member and a steering direction detection unit that detects a steering direction of the operation member. The steering direction detection unit includes a threaded shaft that is rotatable in the steering direction of the operation member, a nut that is screwed to the threaded shaft, a nut guide that causes the nut to move in an axial direction of the threaded shaft in accordance with rotation of the threaded shaft, and a force detection sensor that detects a force that the nut guide receives from the nut. | 06-27-2013 |
20130213728 | VEHICLE STEERING SYSTEM - A variable transmission ratio mechanism is provided on an intermediate portion of a steering shaft, and is able to change a transmission ratio between a shaft on the steering wheel side and a shaft on the steered wheel side by transmitting the sum of rotation of the first shaft and rotation of a rotary shaft of a motor to the second shaft. The variable transmission ratio mechanism is provided with a lock mechanism that restricts the operation of the variable transmission ratio mechanism. When the fact that a rate of change in torque that acts on the steering shaft exceeds a predetermined rate is detected, a period of time until the torque that acts on the steering shaft reaches a torque determination value is estimated. On the condition that the estimated time is shorter than or equal to a predetermined period of time, the lock mechanism is activated. | 08-22-2013 |
20130233639 | ELECTRIC POWER STEERING SYSTEM AND CONTROLLER OF THE ELECTRIC POWER STEERING SYSTEM - Electric power steering system has steering mechanism; input and output shaft side rotation angle sensors detecting rotation angles of input and output shafts; operation circuit calculating command current for an electric motor; rotation direction judging circuit judging whether rotation directions of the input and output shafts are identical; advanced-phase judging circuit judging which phase of input and output shaft side rotation angle signals (S | 09-12-2013 |
20130299270 | ELECTRONIC POWER STEERING WITH DITHERED STEERING MOTOR CONTROL - Methods and apparatus are provided for a dithered EPS system of a vehicle. The apparatus includes a steering assembly having one or more sensors for sensing user steering input. A controller is responsive to the user steering input for providing a motor control signal. The apparatus also includes a dither signal generator providing a dither signal and a combiner for combining the motor control signal and the dither signal to provide a dithered motor control signal to control the motor of the apparatus. The methods include sensing user steering input via one or more sensors coupled to a steering assembly of a vehicle and generating a motor control signal responsive to the user steering input. A dither signal is generated and combined with the motor control signal to provide a dithered motor control signal that is used to control motor. | 11-14-2013 |
20130299271 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING DEVICE USING THE SAME - Provided are a motor controller for suppressing a torque pulsation with a simple configuration and obtaining a sufficient output torque in the case of an open-type fault occurring in any one of windings of a motor and inverters, and an electric power steering device using the motor controller. In the motor controller for controlling a current supplied from and a voltage applied from a power source with respect to the motor including winding sets of a plurality of systems, when a fault determination unit ( | 11-14-2013 |
20140041958 | VEHICLE STEERING DEVICE - The present invention provides a vehicle steering device, comprising: a manual steering means for manually steering steerable wheels in a vehicle; a steering-torque detection means for detecting a steering torque applied to the manual steering means; a first electromotive-torque determination means for determining a first electromotive-torque value based on the detected steering torque; a vehicle-behavior detection means for detecting behavior of the vehicle; a second electromotive-torque determination means for determining a second electromotive-torque value based on a detected value obtained by the vehicle-behavior detection means; an electric motor for applying a combined electromotive torque to the steerable wheels; and a current control means for controlling current supplied to the electric motor based on a value of the combined electromotive torque obtained by adding the first electromotive-torque value to the second electromotive-torque value. | 02-13-2014 |
20140054103 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE USING SAME - Provided are a motor control device ( | 02-27-2014 |
20140076654 | TORQUE SENSOR AND POWER STEERING SYSTEM USING THE TORQUE SENSOR - Torque sensor detects torque of steering shaft formed by first and second shafts which are connected through torsion bar. Torque sensor has: a magnetic member provided at the first shaft and having magnetic poles alternately arranged in circumferential direction concentrically with rotation axis; a first yoke member provided at the second shaft and having (a) first nail portions arranged concentrically with the rotation axis and facing the magnetic member in radial direction and (b) a first ring portion; a second yoke member provided at the second shaft and having (c) second nail portions arranged concentrically with the rotation axis so that the first and second nail portions are alternately arranged in the circumferential direction and the second nail portions face the magnetic member in the radial direction and (d) a second ring portion arranged to be separated from and face the first ring portion; and a magnetic sensor. | 03-20-2014 |
20140076655 | TORQUE SENSOR AND POWER STEERING SYSTEM USING THE TORQUE SENSOR - Torque sensor has: magnetic member; first yoke member having (a) first nail portions arranged concentrically to face the magnetic member in radial direction and (b) first ring portion; second yoke member having (c) second nail portions arranged concentrically so that the first and second nail portions are circumferentially alternately arranged and the second nail portions face the magnetic member in radial direction and (d) second ring portion; first magnetic flux concentration ring provided between the first and second ring portions; second magnetic flux concentration ring provided between the second ring portion and the first magnetic flux concentration ring; and magnetic sensor. The first and second magnetic flux concentration rings and the first and second ring portions are arranged in layers in radial direction. A part or all of axial direction area of the first and second magnetic flux concentration rings is surrounded and shielded by the second ring portion. | 03-20-2014 |
20140076656 | RELATIVE ROTATIONAL ANGULAR DISPLACEMENT DETECTION DEVICE, TORQUE DETECTION DEVICE, TORQUE CONTROL DEVICE, AND VEHICLE - A permanent magnet includes magnetic poles that are arranged so as to alternate in polarity in the circumferential direction of the axis of rotation. The magnet is attached to one of a pair of rotatable members. The rotatable members are relatively rotatable about an axis of rotation. A magnetic flux inducing ring, including an annular ring body and a plurality of protrusions protruding from the ring body, is attached to the other rotatable member. A plurality of magnetic sensors is arranged adjacent to the ring body. A first facing portion and a second facing portion, each for inducing a part of a magnetic flux of the ring body, are provided and do not rotate with the permanent magnet and the magnetic flux inducing ring. | 03-20-2014 |
20140116799 | STEERING CONTROL SYSTEM AND METHOD FOR MANUAL WHEELCHAIRS - An electromechanical steering system for attachment to a manually operated wheelchair, the electromechanical steering system including: an input device arranged to develop an input signal, a motor and a wheel steering system driven by the motor and arranged to communicate with a wheel of the manually operated wheelchair to adjust a steering direction of the wheel based on the input signal. | 05-01-2014 |
20140158455 | ROTATION ANGLE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM INCLUDING THE SAME - Rotation angle computation modes include a normal mode and a simple mode. In normal mode, a rotation angle of an input shaft is computed based on output signals from first and second magnetic sensors, which are sampled at two sampling timings. In simple mode, the rotation angle of the input shaft is computed based on the output signals from the first and second magnetic sensors, which are sampled at one sampling timing, and an amplitude ratio between the output signals from the magnetic sensors set in advance. After a power supply is turned on, the rotation angle is computed in the simple mode until a condition that the rotation angle of the input shaft can be computed in the normal mode even if the immediately preceding value of the rotation angle of the input shaft is not present is satisfied. Then, the rotation angle is computed in the normal mode. | 06-12-2014 |
20140174844 | ELECTRICAL POWER STEERING APPARATUS - A motor control circuit includes a power relay, a converter division, a smoothing condenser, a control circuit and a motor drive circuit, and is connected to a battery as high voltage power and to an electrical motor. The battery is connected with a driving battery having the high voltage such as 288V etc. A step down circuit reduces the high voltage to a low voltage such as 36V etc., charges a low voltage charge device and supplies drive power to the motor drive circuit. When the vehicle collision is occurred, the control circuit detects the collision by a value of detected acceleration, a power change relay is turned on to change to the power source from the low voltage charge device after voltage of the smoothing condenser is reduced, thereby connecting the low voltage to the motor drive circuit. | 06-26-2014 |
20140209407 | ELECTRICAL POWER-STEERING SYSTEM FOR A MOTOR-VEHICLE - An electrical power-steering system for motor-vehicles includes a first pinion and a second pinion meshing with two portions of a rack member which controls the steering angle of the wheels. The two pinions are driven by respective electric motors which are in turn controlled by an electronic control unit. The two portions of the rack member are constituted by two separate elements connected to each other by a connection member interposed therebetween, such that the first and second portions of the rack member behave like a single rigid element when they are driven with identical displacements in a steering maneuver, whereas the connection member allows for a relative movement in the longitudinal direction of the first and second portions of the rack member, with a resulting lengthening or shortening of the rack member, when the first and second portions of the rack member are driven with differentiated displacements in an operative mode for adjustment of the convergence angle of the wheels. | 07-31-2014 |
20140238768 | ELECTRIC POWER STEERING APPARATUS - An end determination unit determines that a steering apparatus is in an end touching state when an angle deviation, which is a difference between an actual turning angle and a target turning angle, exceeds a threshold. This angle deviation exceeds the threshold before a large axial force is generated in a steering shaft. Accordingly, is it possible to determine that the steering apparatus is in the end touching state more quickly. | 08-28-2014 |
20140238769 | ELECTRIC POWER STEERING APPARATUS - A zero point change model executes banked road correspondence control when a vehicle travels on a banked road. By this control, a target turning angle when the total torque is zero can be changed from a neutral turning angle to a lower side of an inclined road surface. Thus, a steering angle of a steering wheel according to a banked road can be realized even if the driver does not apply steering torque during traveling on a banked road. Accordingly, the driver can obtain a suitable steering feeling when traveling on a banked road while achieving the target turning angle according to the total torque. | 08-28-2014 |
20140238770 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus includes a controller that controls, based on an assist command value, driving of a motor used to apply assist torque to a steering mechanism. The controller calculates a first assist component based on a steering torque transmitted to the steering mechanism and calculates a steered angle command value based on the steering torque. The controller executes feedback control to cause a steered angle of steerable wheels to agree with the steered angle command value, thereby calculating a second assist component. The controller calculates the assist command value based on a value obtained by adding the assist components. The controller estimates a grip factor of the wheels on a road surface on which the wheels are traveling based on the steering torque, a first assist torque determined based on the first assist component, and a second assist torque determined based on the second assist component. | 08-28-2014 |
20140246267 | STEERING ANGLE SENSOR AND ELECTRIC POWER STEERING DEVICE EMPLOYING THE SAME - A steering angle sensor | 09-04-2014 |
20140262593 | ELECTRICAL STEERING ASSIST FEATURES FOR MATERIALS HANDLING VEHICLES - A system for providing an electrical steering assist for a materials handling vehicle includes a drive housing; a steerable wheel coupled to the drive housing; a steering arm pivotally mounted to the drive housing; a steer drive unit coupled to the steerable wheel; an input sensing device; and a controller. The steering arm is operatively configured to determine a steering direction of the steerable wheel. The input sensing device is arranged to detect a turning force applied to the steering arm by an operator, wherein the turning force is provided to change the angle of travel of the vehicle. The input sensing device includes a strain measuring assembly defining a strain sensitive region between the steering arm and the steer drive unit. The controller is operatively configured to control the steer drive unit to turn the steerable wheel based upon a signal from the input sensing device. | 09-18-2014 |
20140311817 | ELECTRIC POWER STEERING SYSTEM - An EPS includes a first rack and pinion mechanism that converts rotation of a pinion shaft due to a steering operation, to reciprocating motion of a rack shaft; and a steering force assist device that applies a motor torque of a motor as an assist force by using a second rack and pinion mechanism; and an ECU that controls an operation of the steering force assist device. Rack teeth of the rack shaft constituting the first rack and pinion mechanism are formed so that a steering gear ratio is changed depending on a steering angle. The ECU computes a motor neutral point by subtracting a conversion value from a motor angle detection value. The conversion value is computed based on a steering angle detection value by referring to a conversion map that is set taking into account the steering gear ratio corresponding to the steering angle. | 10-23-2014 |
20140353073 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus includes an electric motor configured to apply an assist torque to an steering system of a motor vehicle, a rotational quantity detection unit for detecting a rotational quantity of the electric motor while the rotational quantity detection unit is in a wake-up state, and a counter electromotive voltage detection unit for detecting a counter electromotive voltage of the electric motor. When a main power supply of the electric power steering apparatus is turned off, the rotational quantity detection unit enters into a sleep state, and when a prescribed condition is established based on the counter electromotive voltage detected by the counter electromotive voltage detection unit, the rotational quantity detection unit transitions from the sleep state to the wakeup state. | 12-04-2014 |
20140360803 | STEERING CONTROLLER - A control section of a steering controller calculates a steer angle which is a turning angle of a first column shaft based on a first detection value detected by a steer angle sensor, and calculates a second shaft turning angle which is a turning angle of a second column shaft based on a second detection value detected by a second shaft rotation angle sensor. A steering torque detection value is calculated based on a third detection value detected by a torque sensor. An abnormality determination part determines abnormalities of the steering torque detection value based on the steer angle and the second shaft turning angle. Thereby, abnormalities of the steering torque detection value are detected without multiplexing the steering torque detection value. Further, if the steering torque detection value is multiplexed, an abnormal steering torque detection value can be specifically identified. | 12-11-2014 |
20140360804 | TORQUE DETECTION APPARATUS AND ELECTRIC POWER STEERING APPARATUS - The torque detection apparatus detects torque using torsion of a torsion bar. The torque detection apparatus includes a first rotating shaft and a second rotating shaft connected with a torsion bar in which torsion is produced when torque is applied, at least one optical scale that moves with rotations of the first rotating shaft and the second rotating shaft, at least one optical sensor that is paired with the optical scale, and detects the polarization of transmissive light or reflected light, the polarization varying depending on a position where light source light is passed through or reflected on the optical scale, and a computing unit that computes a relative rotational angle of the optical scale with respect to the optical sensor, and computes rotational displacements of the first rotating shaft and the second rotating shaft. | 12-11-2014 |
20150027801 | MOVING BODY - The moving mechanism is capable of separating an orientation of a vehicle body from a traveling direction. In addition, the moving mechanism has a low center of gravity and is capable of reducing its weight. A moving body includes a vehicle body, steering actuators, right and left steering hubs, vehicle wheel actuators, and vehicle wheels. The steering actuators are disposed on the right and left sides of the vehicle body and drivable around a vertical axis. The right and left steering hubs are driven by the steering actuators. The vehicle wheel actuators are fixed to the steering hubs. The vehicle wheels are driven by the vehicle wheel actuators and are disposed in an inclined manner with respect to a vertical direction. | 01-29-2015 |
20150090519 | SEMI-DECOUPLED STEERING SYSTEM - A steering system for a vehicle is disclosed. The steering system may have a steering linkage and a controller. When operation of the steering system is within a predefined relative rotational range, the controller may be programmed to translate steering motion to a steering gear box through a motor. Operation of the steering system outside the predefined rotational limit actuates the steering linkage. Once the steering linkage is actuated, steering motion is translated to the steering gear box directly through the steering linkage. | 04-02-2015 |
20150090520 | COLUMN UNIT FOR AN ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus capable of being both lightweight and rigid. A lightweight electric power steering apparatus is achieved wherein a gear housing ( | 04-02-2015 |
20150096826 | METHOD OF CONTROLLING AN ELECTRIC MOTOR OF A POWER STEERING SYSTEM, AND POWER STEERING SYSTEM - A method of controlling an electric motor of a power steering system having at least three windings is described, wherein a control unit applies a current to the windings of the electric motor to generate a total torque having a value which is ascertained by the control unit from a set-point torque for steering assistance and a set-point torque for damping. A damping set-point circuit ascertains the set-point torque for damping and a steering assist set-point circuit ascertains the set-point torque for steering assistance. A monitoring circuit monitors the function of the windings of the electric motor. In the event of a malfunction of any of the windings, the monitoring circuit outputs an error signal, upon which the set-point torque for steering assistance is reduced. | 04-09-2015 |
20150144418 | ELECTRIC POWER STEERING APPARATUS - Provided is an electric power steering apparatus capable of performing steering of a steering wheel with a comfortable steering feeling while stabilizing a vehicle behavior even in a vicinity of a steering neutral position. A first electric power steering apparatus includes a steering torque sensor for detecting a steering torque inputted by a driver, a steering angle sensor for detecting a steering angle of a steering wheel, a steering assist motor for applying a steering assist force to the steering wheel, and a drive control unit for performing drive control of the steering assist motor based on the steering torque and the steering angle. The drive control unit performs drive control of the steering assist motor based on the steering angle detected by the steering angle sensor and hysteresis characteristics related to a steering reaction force associated with a change of the steering angle. | 05-28-2015 |
20150298725 | ELECTRIC POWER STEERING SYSTEM - According to an electric power steering system of the present invention, a bearing support housing member supporting at least one rolling bearing is preferably formed of a resin which can be continuously used in a temperature environment ranging from −40° C. to 85° C., which is made of a resin composition containing a fibrous filler ranging from 30% by mass to 55% by mass, which has a coefficient of linear expansion ranging from 1.2×10 | 10-22-2015 |
20150307126 | TORQUE DETECTION STRUCTURE FOR POWER STEERING DEVICE, AND POWER STEERING DEVICE USING SAME - A ball bearing for rotatably supporting a steering shaft, which is comprised of an input shaft and an output shaft connected to each other via a torsion bar is secured by a lock nut. The lock nut has an inside diameter Y | 10-29-2015 |
20150321691 | COMPENSATION CONTROL APPARATUS OF MOTOR DRIVEN POWER STEERING SYSTEM - A compensation control apparatus of motor driven power steering may include: a torque sensor for measuring a driver's column torque inputted to a steering wheel; and a controller for generating an assist torque based on the column torque measured through the torque sensor, compensating for a phase margin in a low-frequency band for the generated assist torque, detecting a resonance frequency to attenuate resonance, and outputting a final assist torque. | 11-12-2015 |
20150344069 | OSCILLATORY FEEDBACK THROUGH VEHICLE STEERING - There is disclosed a steering system for a vehicle. The system comprises a rotatable steering column co-operable with a steering wheel. A steering member is co-operable with the steering column such that rotary motion of the steering column causes linear motion of the steering member and linear motion of the steering member causes rotary motion of the steering column. An actuator is co-operable with the steering member for linear actuation of the steering member, the actuator being configured for receiving and executing commands from a controller that sends, in dependence on a defined condition, an oscillation command to the actuator to impart an oscillating force to the steering member. A method of providing feedback through a steering system of a vehicle is also disclosed, as are suitable controllers, software and processors. | 12-03-2015 |
20150360716 | Independent Supplementary Electrically Assisted Power Steering System - The present invention involves a primary electric assist with a secondary fall back steering assist in the case of failures of the primary steering system. The primary and fall back systems can be steering column or steering rack based or any combination of these two options. The secondary steering assist system is a low cost design that ensures the steering torque levels will not exceed predetermined values. The secondary electric steering assist will usually deliver less than 50% of the assistance that is provided by the primary steering assistance system. This level of assistance by the secondary system is sufficient to provide for safe operation of the vehicle. | 12-17-2015 |
20160016607 | ROTATION DETECTION DEVICE AND POWER STEERING DEVICE - A welding plate | 01-21-2016 |
20160036288 | DRIVE UNIT AND ELECTRIC POWER STEERING DEVICE INCLUDING THE DRIVE UNIT - A drive unit that includes a rotating electric machine having a stator with winding wound on the stator and with a shaft rotating within the stator, and a rotor rotatable relative to the stator. The drive unit also includes a controller holding member disposed on one end of the rotating electric machine, and a controller having a substrate fixed to the controller holding member, a heat generation element mounted on a heat generation element mounting surface. The drive unit further includes a power supply connector connecting the substrate and a power supply, and a ground line coupled to a ground terminal of the power supply providing a conductive connection to the controller holding member via the substrate and the power supply connector. With this structure, the drive unit's common mode noise may be reduced. | 02-04-2016 |
20160036289 | DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE INCLUDING THE DRIVE DEVICE - A drive device includes a rotating electric machine, a substrate, a first drive element, a second drive element, a first extension line, and a second extension line. The rotating electric machine including a stator with a first winding group and a second winding group wound on the stator in at least three phases. The first extension line and the first drive element, as well as the second extension line and the second drive element have respectively reversed phase orders in an arrangement of the phase orders from an end close to a reference position toward an other end of the arrangement. In such manner, variation of wiring lengths from an electric power supply region among different phases is reduced. | 02-04-2016 |
20160036296 | DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE INCLUDING THE DRIVE DEVICE - A drive device that includes a rotating electric machine having a stator with a winding wound on the stator, a rotor rotatably disposed relative to the stator, and a shaft rotating together with the rotor. The drive device also includes a frame member fixed on the rotating electric machine. The drive device further includes a circuit board fixed on the frame member, with a first surface of the circuit board on a frame member side serving as a heat generation element mount surface. The drive device also has a drive element located on the first surface of the circuit board in a heat dissipatable manner, and serving as a component of an inverter that switches on and off to supply an electric current to the winding. | 02-04-2016 |
20160036304 | DRIVE UNIT AND ELECTRIC POWER STEERING INCLUDING THE DRIVE UNIT - A drive unit includes a rotating electric machine, a frame member, and a controller. The rotating electric machine has a stator that has a winding wound on the stator, a rotor disposed relative to the stator, and a shaft rotating together with the rotor. The frame member is disposed on one axial end of the rotating electric machine. The controller includes a substrate attached on one surface of the frame member facing away from the rotating electric machine, a heat generation element disposed on a heat generation element mounting surface of the substrate, the heat generation element mounting surface facing the frame member, and an electronic component disposed on an electronic component mounting surface of the substrate. | 02-04-2016 |
20160046320 | STEERING DEVICE - A steering device includes: a steering mechanism which includes a steering shaft coupled with a steering wheel and a steered shaft coupled with steered wheels; a steering actuator which applies an assist torque to the steered shaft; a torque sensor which detects a steering torque applied to the steering shaft; and a control unit which controls the steering actuator so as to generate the assist torque based on the steering torque detected by the torque sensor. The steering shaft includes a column shaft which is dividable from another constituent element of the steering shaft. The steering actuator and the control unit are provided as a single unit. The torque sensor is provided at the column shaft. The torque sensor mounts therein a memory unit for storing unique information of the torque sensor. | 02-18-2016 |
20160064853 | Electrical Connector Assembly, Electronic Control Unit Using Same, and Electric Power Steering System Therewith - An electrical connector assembly, connected to a power source or a detection sensor through a cable, includes (a) a base body made of a synthetic resin, the base body having a bottom surface wall, a side surface wall standing up from a periphery of the bottom surface wall, and an interior space defined on the bottom surface wall and enclosed by the side surface wall; and (b) a connector body for achieving an electrical connection, the connector body extending from the bottom surface wall along the side surface wall through the interior space. The bottom surface wall of the base body has an inclined plane that is inclined in relation to a horizontal plane. The interior space of the base body is filled with a sealing agent by allowing the sealing agent to flow down on the inclined plane by gravity. | 03-03-2016 |
20160065030 | ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE - In construction of an electric drive device such as an electric power steering device or the like, there is employed a cylindrical metal housing that has therein in order first, second, third and fourth spaces coaxially arranged to respectively house therein a power circuit part, a power conversion circuit part, a control circuit part and an electric motor, a circular heat transfer metal substrate is arranged in the cylindrical metal housing between the first and second spaces and the circular heat transfer metal substrate has a cylindrical outer wall that is in contact with a cylindrical inner surface of the cylindrical metal housing, one flat surface to which a basal metal plate of the power circuit part is intimately connected and another flat surface to which a basal metal plate of the power conversion circuit part is intimately connected. | 03-03-2016 |
20160075369 | Autopark Steering Wheel Snap Reduction - A system and strategy for reducing rapid steering wheel movement at the end of an autopark maneuver. The strategy includes maintaining or ramping-out power-steering motor torque to reduce steering wheel movement that may occur due to tire windup that has occurred up to that point in the autopark maneuver. The strategy may include the stopping of an autopark maneuver at any time during the maneuver, or functioning at the end of an autopark maneuver. The autopark event may be a park-out maneuver. | 03-17-2016 |
20160090119 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus includes steering mechanisms that direct left and right front wheels of a vehicle equipped with the electric power steering apparatus according to rotation of a steering shaft to which a steering wheel is coupled, a first motor and a second motor that give an assist torque to the steering mechanisms, and a controller that controls the assist torques generated by the first motor and the second motor. The controller causes the first motor to generate the torque in a direction of the steering operation when a generation of the assist torque is started. The controller causes the second motor to generate the torque after a rotation of the first motor is detected. The torque of the second motor is smaller than the torque of the first motor and opposite from the direction of the steering operation. | 03-31-2016 |
20160111985 | BRUSHLESS MOTOR AND ELECTRIC POWER STEERING APPARATUS - On the basis of an energization phase signal being output from a rotational phase sensor and changing its output at every predetermined rotational phase corresponding to a stepwise change (increase or decrease) in rotational phase, a motor controller switches a phase current passing through the corresponding phase coil, and changes the magnitude of the phase current passing through the corresponding phase coil such that an actual motor torque detected by a torque sensor coincides with a target motor torque. | 04-21-2016 |
20160111988 | ROTATING ELECTRIC MACHINE CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE USING THE SAME - A rotating electric machine control device for controlling a rotating electric machine having a winding set with windings for multiple phases includes: an inverter having upper and lower arm elements connected to high and low potential sides, respectively, and converting an electric power of the rotating electric machine; a terminal voltage detection device detecting a terminal voltage of each phase; a resistor connecting each phase and a positive side of a power supply; and a control device having a signal generation device generating a control signal for the upper and lower arm elements and a failure detection device detecting a failure based on a sum of the terminal voltage in all phases when all control signals represents an off command, and a rotation speed of the rotating electric machine is lower than a threshold. | 04-21-2016 |
20160129933 | ELECTRIC POWER STEERING SYSTEM WITH MOTOR CONTROLLER - An electric power steering system for a vehicle works to determine an assist command based on steering torque to produce assist torque through an electric motor for assisting in turning a steering wheel of the vehicle, also determines a tracking command for producing automatic steering torque which brings a value of a given physical quantity associated with steering of the vehicle into agreement a target value, and calculates a steering correction command for use in producing a steering correction torque which reduces the steering torque which arises from output of the torque from the electric motor based on a transfer characteristic of transmission of the output of torque from the electric motor as a part of the steering torque. A motor driver works to actuate the electric motor based on sum of the assist command, the tracking command, and the steering correction command. | 05-12-2016 |
20160129934 | ELECTRIC POWER STEERING SYSTEM WITH MOTOR CONTROLLER - An electric power steering system for a vehicle works to determine an assist command based on steering torque to produce assist torque through an electric motor for assisting in turning a steering wheel of the vehicle, also determines a tracking command for producing automatic steering torque which brings a value of a given physical quantity associated with steering of the vehicle into agreement a target value, and controls a response rate at which a value of a given physical quantity is brought into agreement with a target value in a feedback mode. A motor driver works to actuate an electric motor based on the sum of the assist command and the tracking command to output the torque for steering the system vehicle. | 05-12-2016 |
20160129935 | ELECTRIC POWER STEERING SYSTEM WITH MOTOR CONTROLLER - An electric power steering system for a vehicle works to determine an assist command based on steering torque to produce assist torque through an electric motor for assisting in turning a steering wheel of the vehicle, also determines a tracking command for producing automatic steering torque which brings a value of a given physical quantity associated with steering of the vehicle into agreement a target value, and calculates a vibration correction command for use in producing vibration correction torque which suppresses vibration of the steering torque which arises from output of the torque from the electric motor based on a transfer characteristic of transmission of the output of torque from the electric motor as a part of the steering torque through the steering mechanism. A motor driver works to actuate the electric motor based on the sum of the assist command, the tracking command, and the vibration correction command. | 05-12-2016 |
20160137220 | ELECTRIC POWER STEERING DEVICE - A column-assist type electric power steering device ( | 05-19-2016 |
20160142003 | Motor Control Circuit - A motor control circuit for an electric motor of an electric power assisted steering system comprises a switching circuit comprising a plurality of electrical switches, a current demand signal generator which converts the torque demand signal into a current demands signal; and a fault mode motor current controller that is responsive to an error signal that represents the difference between the current demand signal and the actual current flowing in the motor and is operable in the event of a fault where one phase is open-circuit to drive the remaining two phases as a single combined phase by generating a single voltage demand signal that is representative of the voltage to be applied across the combined phases, the voltage signal being in turn fed into a drive circuit for the switches that generates pulse width modulated switching signals for the switching circuit required to apply the voltage across the combined phases. | 05-19-2016 |
20160144889 | ELECTRIC POWER STEERING DEVICE - An electric power steering device includes a basic return command value calculation unit configured to calculate a basic return command value in a direction returning the steering wheel to a neutral position, on the basis of detection results of a steering angle detector detecting a steering angle of the steering wheel, a first correction gain calculation unit configured to calculate a first correction gain correcting the basic return command value, on the basis of detection results of a vehicle speed detector detecting vehicle speed, and a second correction gain calculation unit configured to calculate a second correction gain correcting the basic return command value, on the basis of a change amount of the steering torque detected by the torque sensor. The basic return command value is corrected by the first and second correction gains so as to calculate a return command value. The return command value is added to the assist command value so as to drive the electric motor. | 05-26-2016 |
20160159388 | STEERING SYSTEM FOR VEHICLE - A steering system includes a steering unit including a first actuator; a turning unit including a second actuator; and a backup mechanism configured to mechanically couple the steering unit and the turning unit, wherein a maximum torque that the first actuator is able to transmit to the second actuator via the backup mechanism is larger than or equal to a maximum torque that the second actuator is able to transmit to the first actuator via the backup mechanism. | 06-09-2016 |
20160159389 | CONTROL APPARATUS - A control apparatus controls a motor of an electric power steering system including: an input shaft connected to a steering member; a column shaft connected to the input shaft; a turning device that includes a rack and pinion mechanism, and turns a wheel; and the motor. The control apparatus includes a reliability computation portion that computes a reliability according to an abnormality detection state regarding at least one of a current sensor, a torque sensor, and a rotational angle sensor; a steering-shaft load estimation portion that estimates a steering shaft load, a torque corresponding value, and a rotational angle corresponding value; and a weight changing portion that changes a weighting of the current corresponding value, the torque corresponding value, or the rotational angle corresponding value according to the reliability. | 06-09-2016 |
20160181953 | DRIVE CONTROL APPARATUS FOR ELECTRIC MOTOR | 06-23-2016 |
20160200352 | CONTROL DEVICE FOR ROTARY MACHINE, AND ELECTRIC POWER STEERING APPARATUS | 07-14-2016 |
20160200355 | Motor Controller, Electric Power Steering Device Using the Motor Controller, and Vehicle Using the Motor Controller | 07-14-2016 |
20180022384 | STEERING CONTROL APPARATUS | 01-25-2018 |
20190144031 | METHODS AND APPARATUS FOR CONTROLLING STEERING NIBBLE IN POSITION CONTROLLED STEERING SYSTEMS | 05-16-2019 |
20190144033 | COIL TEMPERATURE ESTIMATION | 05-16-2019 |
20220135119 | STEERING CONTROL DEVICE AND STEERING CONTROL METHOD - A steering control device and a steering control method are disclosed. Particularly, a steering control device according to the disclosure comprises: a command current calculation unit for calculating a first command current on the basis of detected steering wheel steering information; a resistance calculation unit for calculating internal resistance on the basis of a detected internal temperature; a supply current estimation unit for estimating the supply current of a battery on the basis of an input supply voltage of the battery, the first command current and the internal resistance; and a command current applying unit for comparing the supply current and a preset reference current and, if the supply current is greater than the reference current, changing the first command current to a second command current and applying the second command current to a steering motor. | 05-05-2022 |
20220135120 | PHASE ADJUSTMENT METHOD, CORRECTION VALUE CALCULATION DEVICE, MOTOR CONTROL DEVICE, ELECTRIC ACTUATOR PRODUCT, AND ELECTRIC POWER STEERING DEVICE - A phase adjustment method for a rotation angle sensor configured to detect a rotation angle of a rotor of a brushless motor, the phase adjustment method including: measuring a first rotation speed and a second rotation speed when the brushless motor is driven with a same torque command current to rotate clockwise and counterclockwise, respectively, on a basis of the rotation angle of the rotor detected by the rotation angle sensor; and calculating a correction value to correct a phase of the rotation angle sensor so that a rotation speed difference between the first rotation speed and the second rotation speed decreases. | 05-05-2022 |