| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 180421000 | With condition modulated steering | 69 |
| 20090000855 | POWER STEERING DEVICE - Right-turn and left-turn aimed input shaft drive mechanisms are provided, each comprising a piston unit that slides in a bore formed in an output shaft and a contact surface that is formed on an input shaft. Under normal cruising of a vehicle, a comfortable steering feeling is given by a relatively small counter torque that is produced by a contact between the piston unit and a second inclined surface of the contact surface, and upon stray running of the vehicle due to doze in driving or the like, a relatively large steering torque is produced by a contact between the piston unit and a first inclined surface of the contact surface. An inclination angle of the second inclined surface relative to a traveling path of the piston unit is greater than that of the first inclined surface. | 01-01-2009 |
| 20090038876 | Steering System - A steering system, comprising: an input cylinder having a first hydraulic chamber and a second hydraulic chamber; a transmission mechanism, wherein a transmission efficiency for converting and transmitting a linear motion of the input cylinder to a rotary motion of a steering wheel is less than a transmission efficiency for converting and transmitting the rotary motion of the steering wheel to the linear motion of the input cylinder; an output cylinder connected to a steerable vehicle wheel and having a third hydraulic chamber and a fourth hydraulic chamber; a first hydraulic passage for connecting the first hydraulic chamber to the third hydraulic chamber; a second hydraulic passage for connecting the second hydraulic chamber to the fourth hydraulic chamber; a flow rate control mechanism for exchanging hydraulic oil with: a first hydraulic circuit including the first and third hydraulic chambers and the first hydraulic passage; and a second hydraulic circuit including the second and fourth hydraulic chambers and the second hydraulic passage, in order to adjust a ratio of hydraulic oil quantities in the first and second hydraulic circuits; a steering actuator for providing the steerable vehicle wheel with a steering power assistance; and
| 02-12-2009 |
| 20090101430 | POWER STEERING APPARATUS - A power steering apparatus includes a steering shaft, a hydraulic power cylinder connected to the steering shaft and having first and second hydraulic chambers, a hydraulic pump that discharges a hydraulic pressure to the power cylinder, a control valve that supplies the hydraulic pressure from the pump to the first and second hydraulic chambers selectively in response to a steering operation, a steering shaft actuation unit driven by the hydraulic pressure from the pump to apply a torque to the steering shaft, a detection unit that detects information about a vehicle, driver and/or road, and a hydraulic control unit that supplies the hydraulic pressure from the pump to either of the control valve and the steering shaft actuation unit according to the detected information and, at the supply of the hydraulic pressure to the steering shaft actuation unit, increases the hydraulic pressure supplied to the steering shaft actuation unit. | 04-23-2009 |
| 20090133953 | POWER STEERING SYSTEM HAVING A VARIABLE-RATIO DRIVE MECHANISM FOR A VEHICLE - A power steering system for translating movement to a pair of wheels of a vehicle having an engine is disclosed. The system includes a steering assembly adapted for coupling engagement to the wheels for turning the wheels. The system includes a hydraulic pump having a pump input and a pump output and is coupled to the steering assembly and a planetary gear set. The system also includes a steering shaft operatively connected to the hydraulic pump for controlling a direction of the pump output and coupled to the steering assembly. The system further includes a variable-ratio drive mechanism having an electric motor and a controller. The electric motor is coupled to the planetary gear set and the controller communicates with the electric motor for controlling a rotational speed of the planetary gear set to maintain the pump output. | 05-28-2009 |
| 20090133954 | Rear axle steering system for a mobile crane - A rear axle steering system for a mobile crane including at least one actively steered rear axle with wheels arranged thereon. A rear axle steering system of this type is provided with a hydraulic steering system including one or more hydraulic steering cylinders of which a particular number are in each case associated with an actively steered rear axle in order to steer this actively steered rear axle in a desired manner. A braking system is adapted to individually brake each wheel of the at least one actively steered rear axle. In the event of an error in the hydraulic steering system, a control system actuates the braking system in such a way that by selective braking of at least one wheel of the actively steered rear axle, which is affected by this error, the rear axle is brought to a predetermined, desired steering position. A method of steering a rear axle, with wheels of a mobile crane arranged thereon, by means of a hydraulic steering system. | 05-28-2009 |
| 20100044142 | HYDRAULIC STEERING - The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank connection (T) and a working connection arrangement with two working connections (L, R), an auxiliary-force operated steering valve, which is located in parallel with the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R), and a feedback suppressing device, which is active, when the steering valve is active. It is endeavoured to find a simple manner of ensuring the priority of the steering initiator over the steering valve. For this purpose, the steering initiator interacts with an activation sensor, which deactivates the feedback suppressing device on an activation of the steering initiator. | 02-25-2010 |
| 20100044143 | HYDRAULIC STEERING - The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank connection (T) and a working connection arrangement with two working connections (L, R), an auxiliary-force operated steering valve, which is located in parallel with the steering unit between the supply connection arrangement (P, T) and the working connection arrangement (L, R), and a feedback suppressing device, which is active, when the steering valve is active. It is endeavoured to find a simple manner of ensuring the priority of the steering initiator over the steering valve. For this purpose, the steering initiator interacts with an activation sensor, which deactivates the feedback suppressing device on an activation of the steering initiator. | 02-25-2010 |
| 20100059307 | Device for Controlling Torsional Stiffness of Power Steering System - A device for controlling torsional stiffness of a power steering system, may include a variable torsion bar, an input shaft that is connected with a steering wheel, a pinion shaft equipped with a pinion gear engaged with a rack bar of a steering gear box, wherein the input shaft and the pinion shaft are combined each other to form a guide hole and slidably receive the variable torsion bar therein, and an actuating apparatus that moves the variable torsion bar toward the input shaft or the pinion shaft along a longitudinal axis of the input shaft and the pinion shaft according to a hydraulic pressure so as to change a size of a cross-section of the device. | 03-11-2010 |
| 20100307857 | STEERING OPERATION DEVICE - In a steering operation device, a hydraulic actuator is driven by hydraulic pressure and vary the steering angle of the vehicle. A steering valve adjusts the flow rate of oil supplied to the actuator according to a pilot pressure. A pilot valve adjusts the pilot pressure input to the steering valve according to a difference between a displacement of an operation input shaft and a displacement of a feedback input shaft. A joystick lever is linked to the operation input shaft and moves the operation input shaft according to a tilt angle. A drive device displaces the feedback input shaft. A steering angle sensor detects the steering angle and outputs the angle as a detected signal. A controller sends a command signal to the drive device so as to displace the feedback input shaft according to the detected steering angle. | 12-09-2010 |
| 20100320024 | HYDRAULIC STEERING - The invention concerns a hydraulic steering ( | 12-23-2010 |
| 20120000725 | Engine-Off Power Steering System - Motor vehicles are equipped with a center-closed power steering system to provide power steering assistance in engine-off conditions for reduced fuel consumption. The power steering system includes a hydraulic pump mechanically driven by the engine, a high pressure accumulator, a steering gearbox fluidly connected to the accumulator, and a center closed valve mechanically connected to a driver-operated steering wheel. The valve is configured to selectively control flow of pressurized fluid from the accumulator to the steering gearbox to provide power steering assistance. | 01-05-2012 |
| 20130015013 | POWER STEERING APPARATUSAANM SUNAGA; SosukeAACI Higashimatsuyama-shiAACO JPAAGP SUNAGA; Sosuke Higashimatsuyama-shi JPAANM Ishikawa; ShogoAACI Hiki-gunAACO JPAAGP Ishikawa; Shogo Hiki-gun JP - A power steering apparatus including a power cylinder, first and second pumps, a control valve serving for selectively supplying a working fluid supplied from the first or second pump to one of a pair of pressure chambers of the power cylinder in accordance with a steering operation, first and second reservoir tanks, and a return passage changeover valve disposed between the control valve and the first and second pumps, the return passage changeover valve serving for communicating the first and second pumps with the control valve regardless of an axial position of a valve element and communicating one of the first and second reservoir tanks with the control valve in accordance with the axial position of the valve element to thereby carry out changeover between circulating fluid passages for circulating the working fluid to the first reservoir tank and the second reservoir tank. | 01-17-2013 |
| 20130037340 | SYSTEM AND METHOD FOR SELECTIVELY CHARGING AND DISCHARGING A STEERING ACCUMULATOR - A system and method for selectively charging and discharging a steering accumulator are provided. One vehicle steering system includes a hydraulic pump configured provide a source of pressurized hydraulic fluid for use in steering the vehicle. The steering system also includes an accumulator configured to hold pressurized hydraulic fluid from the pump for use in steering the vehicle in case of need. The steering system includes a charging circuit configured to selectively allow the hydraulic fluid to flow from the hydraulic pump to the accumulator based on a fluid pressure applied by a first pilot and a second pilot. The steering system includes a charging bypass circuit configured to allow the hydraulic fluid to flow to a steering control unit and to bypass the charging circuit. The hydraulic pump supplies fluid to the charging circuit and the bypass circuit. | 02-14-2013 |
| 20130075186 | APPARATUS FOR USE IN TURNING STEERABLE VEHICLE WHEELS - An apparatus includes a hydraulic power steering motor. A continuously variable transmission has an input shaft rotatable under the influence of force transmitted from the engine and an output shaft operable to drive a pump. The continuously variable transmission is operable to drive the pump at a first speed when one of the input and output shafts of the continuously variable transmission rotates at a first speed. The continuously variable transmission is operable to drive the pump at a second speed when the one of the input and output shafts rotates at a second speed. A centrifugal sensor is connected with the one of the input and output shafts. The centrifugal sensor transfers rotational movement of the one of the input and output shafts to a linearly displaceable input member of the continuously variable transmission to change the speed at which the pump is driven. | 03-28-2013 |
| 20130075187 | APPARATUS FOR USE IN TURNING STEERABLE VEHICLE WHEELS - An apparatus ( | 03-28-2013 |
| 20130075188 | APPARATUS FOR USE IN TURNING STEERABLE VEHICLE WHEELS - An apparatus ( | 03-28-2013 |
| 20130118826 | POWER STEERING SYSTEM - A power steering system includes: a hydraulic cylinder that generates a steering assist force; a hydraulic control valve that has a spool that adjusts the state of supply and drainage of the hydraulic fluid to and from the hydraulic cylinder based on a position of the spool; a driving unit that displaces the spool by driving the spool with a predetermined driving force; and a determination unit that determines that there is an abnormality in the hydraulic control valve when the driving force for displacing the spool falls outside a predetermined range. | 05-16-2013 |
| 20130161113 | HYDRAULIC POWER STEERING SYSTEM - When an ECU is powered on, an overall control unit determines whether a temperature detected by a temperature sensor is lower than or equal to a predetermined temperature. When it is determined that the detected temperature is lower than or equal to the predetermined temperature, the overall control unit provides a second operation start command for operating a valve driving motor control unit in a rotation direction alternately switching mode, to the valve driving motor control unit. When the valve driving motor control unit receives the second operation start command from the overall control unit, the valve driving motor control unit starts operating in the rotation direction alternately switching mode. | 06-27-2013 |
| 20140332308 | POWER STEERING ASSEMBLY WITH DIFFERENTIAL ANGLE SENSOR SYSTEM - A power steering assembly having an input shaft for connection to a steering wheel, an output shaft coupled to the input shaft for operational engagement with a steering rod, a servo controller, an actuator, a sensor system, and an evaluation unit for evaluating measurement values provided by the sensor system. The coupling between input and output shafts permits a relative rotation therebetween. The servo controller has a rotatable final control element with and driven by the output shaft. The steering force assistance is controlled depending on relative rotation between the input shaft and control element. The engagement between the output shaft and control element provides a relative displacement therebetween. The actuator relatively displaces the control element in relation to the output shaft. The sensor system measures at least one differential angle between the control element and output shaft or between the control element and input shaft. | 11-13-2014 |
| 20140332309 | STEERING SYSTEM FOR WHEELED CONSTRUCTION EQUIPMENT - Disclosed is a steering system which is capable of ensuring that a wheeled excavator travels straight while being driven on a paved road. The steering system for wheeled construction equipment includes: a hydraulic oil pump; a steering motor connected to the hydraulic oil pump; a steering valve controlling the operation of the steering motor; a steering handle operating the steering motor and the steering valve according to steering manipulation by the driver; and a steering cylinder steered by the manipulation of the steering handle. The steering system further includes an idle mode control unit which converts working mode into a steering mode not having straight line driving recovery performance when working mode, in which working and driving are enabled, is selected, and which converts exclusive driving mode into a steering mode having the straight line driving recovery performance through a signal input when the exclusive driving mode, in which only driving is enabled, is selected. | 11-13-2014 |
| 20150047919 | UNIVERSAL CARTRIDGE TORQUE OVERLAY ASSEMBLY - In one aspect of the invention, a power steering assist system is provided. The system includes a housing, an actuator assembly, a rotary valve assembly, a bearing assembly, a differential pressure transducer, and a coupler. The coupler includes a first end and a free second end, the free second end extending from the housing and configured to couple to a component of a steering gear system. | 02-19-2015 |
| 20150298729 | POWER STEERING SYSTEM FOR A VEHICLE - A power steering system includes a first steering mechanism designed to control the steering of at least one of the wheels of a steered axle and includes a mechanical transmission of the movement from a steering wheel of the vehicle to the wheel, a first actuator controlled by a parameter related to the steering wheel movement and capable of providing a steering assistance effort to the wheel. The power steering system further includes a second steering mechanism which includes a second actuator capable of providing a steering assistance effort to at least one of the wheels of the same axle, the second actuator having a housing which is secured to the axle, a first and a second piston rods able to slide through the housing and extending, on opposite sides, beyond the housing, with the piston rods being substantially parallel to the axle. | 10-22-2015 |
| 20160200349 | STEERING SYSTEM HAVING DUAL STEERING RATIOS | 07-14-2016 |
| 180422000 | With electrical control | 46 |
| 20080236931 | HYDRAULIC STEERING SYSTEM - The invention provides a steering system e.g. for a vehicle. The system comprises a system-pump, a steering actuator, a rotary valve, a rotary meter, and a motor. The system-pump is arranged to provide a flow of a fluid to the steering actuator via the rotary valve and via the rotary meter, and the motor is arranged to provide rotation of the rotary valve and the rotary meter. To handle an emergency situation if the system-pump fails, the motor is dimensioned to operate the rotary meter as a fail-operational pump for pumping a flow of the fluid to the steering actuator if the system-pump fails. | 10-02-2008 |
| 20080264711 | Force-Based Power Steering System - A power steering system includes a double-acting power cylinder ( | 10-30-2008 |
| 20080277187 | Power steering apparatus - An engine driven pump | 11-13-2008 |
| 20080277188 | Front Steering Module For A Zero Turn Radius Vehicle - A front steering module adapted for integration with the subframe of a zero-turn radius vehicle incorporating an electronic steering apparatus. The module provides both front wheel steering and corresponding control inputs for the electronic steering apparatus. The module has a frame member having a pair of steered wheel assemblies mounted thereto and a mounting member for attachment to the vehicle. The module further comprises a steering mechanism and a steering position sensor for providing input to the electronic steering apparatus. | 11-13-2008 |
| 20090014230 | On-demand electro-hydraulic steering system - A method of steering a vehicle with a hydraulic steering system is disclosed. A first control signal is sent to a pilot valve. The pilot valve is operated to direct pilot fluid to a main valve in response to the first control signal. The main valve is opened to a first position in response to the pilot fluid. Fluid is directed through the main valve to a first actuator. Resistance to actuation of the first actuator is detected. The detected resistance is compared to a threshold resistance. A second control signal is sent to the pilot valve when the detected resistance exceeds the threshold resistance. The pilot valve is operated to direct pilot fluid to the main valve in response to the second control signal. The main valve is opened to a second position in response to the pilot fluid. Fluid is directed through the main valve to the first actuator and a second actuator. | 01-15-2009 |
| 20090159360 | Energy efficient power steering pump control system - An electronic control unit monitors pressure conditions present at the input to the steering system and other vehicle data signals and then provides override control of a hydro-mechanical flow control device. An electro-hydraulic valve is connected to the supply side of the hydro-mechanical flow control device and reacts to the electronic monitoring of pressure and other vehicle data to alter the counter-balancing forces within the hydro-mechanical flow control device. This causes a by-pass diversion of steering fluid to the source by the hydro-mechanical flow control device and thereby relieves backpressure on the pump when relatively little steering assist is required to be provided by the steering system. The control of steering fluid diversion at such times results in a significant reduction in parasitic losses within the steering system and improves the operating and fuel efficiency of the vehicle. | 06-25-2009 |
| 20090194361 | Power Assisted Steering System with an Auxiliary Electric Pump - A power assist steering system for a vehicle, especially for a truck or commercial vehicle, is disclosed that includes a mechanical engine-driven power steering pump that pumps hydraulic fluid to a power steering unit, and an electrical pump adapted to pump hydraulic fluid so as to optimize a power steering flow to the power steering unit and to minimize internal pump flow. | 08-06-2009 |
| 20090211835 | INHERENTLY FAILSAFE ELECTRIC POWER STEERING SYSTEM - An electronically controlled hydro-mechanically coupled power steering system includes a double-acting power cylinder having a directional control under-lapped four-way open center valve and a motor driven pump. A controller selectively provides pressurized fluid to the double-acting power cylinder to function in the manner of an inherently failsafe EPS system. | 08-27-2009 |
| 20090211836 | Hydraulic Servo-Steering Device and Method for Controlling a Pump Drive Motor - A hydraulic servo-steering device includes a pump and a pump drive motor. At least one defined high power stage (C) and one defined low power stage (B) are provided in which the motor is selectively operated. Moreover, a defined additional power stage (A) is provided for the motor, in which the speed of the motor is reduced with respect to the low power stage (B). According to a method for controlling the pump drive motor of the hydraulic servo-steering device, the motor is operated in the additional power stage (A) under certain conditions which rule out an impairment to driving safety. | 08-27-2009 |
| 20090223737 | Power Assisted Steering System - A hybrid electrical power assist system (EPAS) for an automotive vehicle that utilizes the advantages of a conventional EPAS system to provide power assist based upon several distinct sensor inputs, in a heavy duty vehicle that requires significantly more assistance forces than a conventional EPAS can provide. The hybrid system utilizes a hydraulic amplifier that is connected to receive the torque output from an EPAS motor actuator and responsively provide a fluid under differential pressure through a pair of high pressure lines to a steering piston. | 09-10-2009 |
| 20090255750 | STEERING SYSTEM FOR ENGINEERING VEHICLE - A priority valve | 10-15-2009 |
| 20090314572 | Closed center valve steering system with adjustable pressure - The present invention relates to an apparatus ( | 12-24-2009 |
| 20100006366 | STEERING SYSTEM FOR CONTROLLING THE TURNING ANGLE OF THE STEERING WHEELS OF A VEHICLE - A steering system is provided for controlling the turning angle of the steering wheels of a vehicle. The steering system includes two electro-hydraulic circuits each including an actuator, both actuators being mechanically coupled and acting simultaneously on the turning angle of the wheels. A first circuit is displacement-controlled relative to a position set point while a second circuit is stress controlled. The set point applied of the second circuit includes a component developed from the filtering of the position set point applied to the first circuit. | 01-14-2010 |
| 20100018796 | Apparatus for controlling a power-assisted steering gear in response to vehicle conditions - An apparatus ( | 01-28-2010 |
| 20100108431 | STEERING SYSTEM - A steering system that with a directional control valve | 05-06-2010 |
| 20100147619 | METHODS AND SYSTEMS INVOLVING ELECTROMAGNETIC TORSION BARS - An actuator assembly including, a polar assembly including an inner tooth and an outer tooth, and a magnet disposed between the inner tooth and the outer tooth, the magnet operative to interact with the polar assembly to induce an electromagnetic torsion bar operative to impart a torque on a first shaft connected to the ring magnet. | 06-17-2010 |
| 20100212994 | Hybrid Steering System - A steering system for a vehicle comprising a steering control to effect mechanical steering of the vehicle, the steering control being mechanically connected via a mechanical steering train, to at least one steerable ground engaging wheel. A power assistor apparatus is present for power assisting the mechanical steering of the vehicle when the operator operates the steering control. The system includes a hydraulic steering actuator which is operable by an electronically controlled hydraulic steering control valve to effect hydraulic power steering of the vehicle independently of the operation of the steering control. The electronically controlled hydraulic steering control valve is operable in response to signals from an electronic controller, the hydraulic steering actuator being supplied with pressurised hydraulic fluid from a supply valve arrangement. A sensor device detects when the steering control is operated and provides input to the electronic controller, the controller disabling the hydraulic power steering in response. | 08-26-2010 |
| 20100307858 | Vehicle Steering System - The invention relates to a vehicle steering system having a hydraulic actuator ( | 12-09-2010 |
| 20110094820 | Vehicle Steering System of the By-Wire Design Type - A vehicle by-wire steering system includes a hydraulic default level. A hydraulic feed unit and a hydraulic actuating unit can be connected together by two hydraulic lines such that when an actuator is non-functional, a steering wheel rotational angle is transformed into a corresponding wheel steering angle by the hydraulic feed unit and the hydraulic actuating unit. The hydraulic lines can be connected together by a switchable steering valve, which is designed as a proportional servo valve, of which the flow cross section can be adjusted in essence continuously between the two extremes of completely closed and completely open. | 04-28-2011 |
| 20110132681 | Steering Control System Combining Electro-Hydraulic And Manually-Actuated Pilot Pressure Control Valves For Safe Operation - A steering control system for directing fluid to steering actuators on a machine include a set of right and left manually-operated pilot pressure fluid control valves and a set of right and left electro-hydraulic (EH) pilot pressure fluid control valves, with both sets being coupled to a main steering control valve for controlling movement of the latter to effect operation of the steering actuators. An electronic control unit (ECU) includes a computer and a memory and receives signals representative of various operating parameters of the control system and of the vehicle ground speed and operates to control the EH pilot pressure control valves and a set of right and left solenoid-operated valves such that only flow from the set of manually-operated valves is connected for operating the main steering control valve to effect a least aggressive steering mode when the vehicle speed is indicative of road travel, and for also actuating the EH pilot pressure control valves for effecting a more aggressive steering mode when the vehicle speed is low indicating off-road travel. EH valve failure results in the control system defaulting to that for effecting the least aggressive steering mode, while failure of one or both of the manually-controlled valves results in the EH control valves being activated to provide that pilot pressure called for by the manually-operated valve. | 06-09-2011 |
| 20110266084 | METHOD OF RELIEVING POWER STEERING ASSIST AND A POWER STEERING SYSTEM UTILIZING THE METHOD - A power steering system for a ground vehicle includes an accumulator that supplies high-pressure fluid through a control valve to a fluid motor that drives the steerable wheels of the vehicle. A normally open control valve between the accumulator and the fluid motor closes prior to the steerable wheels reaching an axle stop to relieve power assist. | 11-03-2011 |
| 20110297473 | HYDRO-MECHANICAL STEERING UNIT WITH INTEGRATED EMERGENCY STEERING CAPABILITY - A steering system includes a steer-by-wire (SBW) valve, a main steering pump, a steering actuator, and a steering control unit (SCU). The SCU is in fluid communication with the actuator via a pair of fluid conduits, and includes upper and lower portions. The upper portion contains a first solenoid valve and a cross-over check valve assembly. The lower portion contains a fluid control valve. An ECU generates a steering input signal in response to steering wheel rotation, and transmits the signal to the SBW valve. The SCU controls the first solenoid valve to deliver fluid from the lower portion to the actuator via the cross-over valve assembly in an emergency steering mode, and also controls the first solenoid valve to prevent flow into the actuator and allow recirculation of fluid within the lower portion in a torque feel mode. | 12-08-2011 |
| 20120097471 | HYDRAULIC POWER STEERING APPARATUS - A hydraulic power steering apparatus assists in steering of a vehicle with a hydraulic cylinder. The hydraulic power steering apparatus includes a flow control valve, a steering torque sensor, a steering angle sensor, a vehicle speed sensor, and an ECU. The flow control valve changes the supply/drainage amount of hydraulic fluid for the hydraulic cylinder. The ECU sets a supply/drainage mode for supplying/draining the hydraulic fluid with respect to the hydraulic cylinder based on detection results from the aforementioned sensors and controls the flow control valve in accordance with the supply/drainage mode of the hydraulic fluid. | 04-26-2012 |
| 20120097472 | HYDRAULIC POWER STEERING SYSTEM - A hydraulic power steering system includes: a hydraulic cylinder in which an interior is partitioned into first and second hydraulic chambers by a piston on a steered shaft; a variable displacement electric pump that supplies hydraulic fluid to the hydraulic cylinder; a selector valve selectively set in a mode in which the hydraulic fluid is supplied to the first hydraulic chamber and drained from the second hydraulic chamber or in a mode in which the hydraulic fluid is supplied to the second hydraulic chamber and drained from the first hydraulic chamber; a detector that detects torque, steering angle, and/or vehicle speed; and a controller. | 04-26-2012 |
| 20120160594 | Power Steering System - Disclosed is a power steering system comprising: a control valve disposed in the steering mechanism to selectably supply a working liquid supplied from a first pump or a second pump to a pair of pressure chambers of a power cylinder providing a steering force for at least one steered wheel in accordance with a rotational steering operation of a steering wheel; a first switching valve disposed between the first pump and the control valve to switch a communication and an interruption of the working liquid between the first pump and the control valve; and a second switching valve disposed between the second pump and the control valve to switch the communication and the interruption of the working liquid between the second pump and the control valve, a communication state and an interruption state being selectably formed in the second switching valve when the first switching valve is in the communication state. | 06-28-2012 |
| 20120199411 | VARIABLE DISPLACEMENT PUMP - A variable displacement pump includes a pumping part and a cam ring for supplying working fluid to a vehicle steering device. The cam ring is arranged radially outside of the pumping part, and configured to move along with a change in eccentricity of the cam ring, wherein the change in eccentricity causes a change in specific discharge rate. A solenoid is configured to control the eccentricity of the cam ring by being driven with an energizing current conformed to a control setpoint. A base setpoint is calculated based on steering angular speed and vehicle speed. The control setpoint is calculated based on the base setpoint and steering angular acceleration in a manner that the control setpoint increases more quickly than the base setpoint when the base setpoint increases in accordance with steering operation of the steering wheel. | 08-09-2012 |
| 20120247864 | SOLENOID VALVE DEVICE, HYDRAULIC APPARATUS EQUIPPED WITH THE SOLENOID VALVE DEVICE, AND HYDRAULIC POWER STEERING SYSTEM EQUIPPED WITH THE HYDRAULIC APPARATUS - A solenoid valve device includes: a solenoid valve that includes a solenoid that is supplied with driving current to generate magnetic flux, and a valve element that is moved by the magnetic flux generated from the solenoid; and a control device that controls the solenoid valve. The control device includes an alternating current component in the driving current and supplies the driving current including the alternating current component to the solenoid, and detects an impedance of the solenoid. | 10-04-2012 |
| 20120305328 | STEERING SYSTEM HAVING A HYDRAULIC STEERING COLUMN - The invention relates to a steering system for a motor vehicle, comprising a steering wheel, a steering gear shaft and a hydraulic master unit, the steering gear shaft being in mechanical active connection with the master unit via a toothing, and also comprising hydraulic lines and a hydraulic slave unit in a steering gear which, for swivelling steerable wheels is mechanically coupled therewith, an electronic control for controlling an electric servomotor being provided which is actively connected to the steering gear, the active connection between the steering shaft and the hydraulic master unit being a toothing with a variable transmission. | 12-06-2012 |
| 20130032429 | POWER STEERING SYSTEM FOR A VEHICLE PROVIDED WITH MEANS FOR ACTUATING THE STOP & START FUNCTION IN A MOVING VEHICLE, ESPECIALLY AN INDUSTRIAL OR COMMERCIAL OR SPECIAL VEHICLE - The present invention relates to a power steering system for a vehicle provided with means for actuating the stop & start function in a moving vehicle, especially an industrial or commercial or special vehicle, said vehicle being equipped with hybrid drive of the parallel type, comprising a thermal engine ( | 02-07-2013 |
| 20130037341 | HYDRAULIC POWER STEERING SYSTEM - A pump rotation speed correcting unit includes a valve opening degree command differential value computing unit, a pump rotation speed correction value computing unit, and a correction value adding unit. The valve opening degree command differential value computing unit computes a temporal differential value of a valve opening degree command value that is set by a valve opening degree command value setting unit. The pump rotation speed correction value computing unit computes a correction value of a pump rotation speed command value on the basis of the valve opening degree command differential value. The correction value adding unit adds the pump rotation speed correction value to the pump rotation speed command value that is set by the pump rotation speed command value setting unit. | 02-14-2013 |
| 20130112492 | HYDRAULIC POWER STEERING SYSTEM - A hydraulic power steering system includes a rotation angle sensor that detects a rotation angle of a shaft. A rotary valve includes a valve element that rotates together with the shaft of an electric motor and a housing that has an internal space connected to oil passages. A control unit reflects an output from the rotation angle sensor on control of the electric motor. | 05-09-2013 |
| 20130199865 | HYBRID POWER STEERING SYSTEM - In a hybrid power steering system, two steering assisters for supporting a steering force when the driver operates the steering wheel. The steering supporting force can be divisionally used according to the increase of speed and weight of a vehicle, thereby reducing the load applied to any of the steering assisters such that operating noise can be reduced and the endurance can be increased. Further, a motor of a lower power specification may be used even in the case of a truck or a bus that requires a relatively high steering force as compared to a passenger vehicle. Accordingly, production costs can be reduced and a sufficient steering supporting force can be obtained, thereby improving the driver's convenience, and enhancing fuel efficiency while increasing energy efficiency. Further, the steering can be safely maintained even when one of the steering assisters is not operating normally while the vehicle is being driven. | 08-08-2013 |
| 20130240287 | APPARATUS FOR USE IN TURNING STEERABLE VEHICLE WHEELS - An apparatus ( | 09-19-2013 |
| 20130277136 | METHOD FOR UNOBTRUSIVE ADAPTATION TO ENABLE POWER STEERING IN VINTAGE CARS - A retro-fittable power steering system for a vehicle; said system including an actuator acting on a component of the steering system of a said vehicle downstream of the steering box of said steering system; said system characterised in that said power steering system is activated manually under driver control; said system further characterised in that original steering components of said vehicle remain un-modified. | 10-24-2013 |
| 20140246264 | FULL HYDRAULIC POWER STEERING WITH POSITIVE FORCE FEEDBACK - A force feedback system including a first hydraulic cylinder operably coupled to one or more tires of a vehicle, a power assist steering unit operably coupled to the one or more tires of the vehicle, and a second hydraulic cylinder operably coupled to the power assist steering unit, wherein the first and second hydraulic cylinders are hydraulically coupled to transmit force between the first and second hydraulic cylinders. | 09-04-2014 |
| 20140367189 | STEERING DEVICE FOR VEHICLE - Front wheels ( | 12-18-2014 |
| 20150041239 | ELECTRO-HYDRAULIC POWER STEERING APPARATUS FOR ENVIRONMENT-FRIENDLY VEHICLE AND METHOD OF CONTROLLING THE SAME - An electro-hydraulic power steering apparatus for an environment-friendly vehicle and a method of controlling the same is provided. In particular, a gear box assists in a steering force of a steering wheel, and a reservoir tank stores hydraulic oil therein. An electro-hydraulic power pump pumps the hydraulic oil via an electric motor to supply the hydraulic oil to the gear box. A first valve is mounted to a hydraulic line through which the hydraulic oil flows from the electro-hydraulic power pump to the gear box, and a second valve is mounted to a hydraulic line through which the hydraulic oil returns from the gear box to the reservoir tank. | 02-12-2015 |
| 20150144417 | POWER STEERING SYSTEM - In a power steering system, when power is on, a normal mode process is executed and a target rotational speed is set based on a rotational speed map for a normal mode. When the normal mode process is being executed, if a first mode switching condition that a detected vehicle speed is equal to or lower than a prescribed value, the absolute value of a detected steering angle is equal to or greater than a prescribed value, and the absolute value of a detected steering, angular velocity is equal to or less than a prescribed value is satisfied, the target rotational speed is set based on a rotational speed map for a rack end mode. | 05-28-2015 |
| 20150298728 | POWER-STEERING DEVICE - A power steering device is provided with a device body and a hollow motor. The device body has a steering system in which a piston is disposed on an output shaft via a ball screw mechanism so that a steering (rotational) torque is transmitted from an input shaft to the output shaft and converted to rotation of a sector shaft by axial movement of the piston for steering of steerable wheels. The hollow motor is connected to the outer circumference of the input shaft and driven by energization control based on driving support information from a vehicle-mounted camera and the like. A key and a key groove are provided on the outer circumference of the input shaft and the inner circumference of a rotor of the hollow motor, respectively, so as to constitute a key connection between the input shaft and the hollow motor. | 10-22-2015 |
| 20150307124 | ELECTRIC-CONTROL MULTIMODE STEERING VALVE, STEERING HYDRAULIC CONTROL SYSTEM, AND WHEEL TYPE CRANE - An electric-control multimode steering valve comprises: a flow distributing and collecting valve, a first electromagnetic valve, and a second electromagnetic valve. A valve body comprises four groups of paired valve oil ports. First oil ports of the first and second electromagnetic valves are in communication with a first group. Second oil ports of the first and second electromagnetic valves are in communication with a second group. A third oil port of the first electromagnetic valve is in communication with a flow collecting port of the flow distributing and collecting valve. A first flow distributing port of the flow distributing and collecting valve and a third oil port of the second electromagnetic valve are in communication with a third group. A second flow distributing port of the flow distributing and collecting valve and the third oil port of the second electromagnetic valve are in communication with a fourth group. | 10-29-2015 |
| 20160107681 | STEERING SYSTEM WITH MAGNETIC TORQUE OVERLAY - A steering system with magnetic torque overlay of a vehicle is provided. The system comprises a hydraulic valve and differential-pressure transducer that monitors pressure created by the valve due to torque exerted by a driver of the vehicle in various directions on a steering wheel thereof. The transducer is fastened to a recirculating ball steering gear. A magnetic actuator generates an output of torque required from the steering gear for a maneuver of the steering wheel and applies the torque to the valve independently of input by the driver. A permanent magnet is located proximate the actuator. A control module calculates an appropriate amount of electric current and sends it to the actuator to generate the output torque. The torque is added to or subtracted from the system in any of the directions independently of the driver input by the pressure-monitoring and inputs from the vehicle into the control module. | 04-21-2016 |
| 20160152260 | CONTROL METHOD FOR ELECTRO HYDRAULIC POWER STEERING SYSTEM | 06-02-2016 |
| 20160159391 | STEERING SYSTEM FOR AN AGRICULTURAL VEHICLE - A steering system for an agricultural vehicle has at least one steering cylinder for changing a steering angle of the agricultural vehicle, a hydraulic main steering valve for pressurizing the at least one steering cylinder, a steering transducer for actuating the main steering valve, a steering boost for controlling an adjustment characteristic between the steering transducer and the at least one steering cylinder and a sensor system for detecting an external signal of the agricultural vehicle. The steering boost controls the adjustment characteristic on the basis of the detected external signal. | 06-09-2016 |
| 20180022380 | HYDRAULIC ARRANGEMENT WITH TWO DRIVE MOTORS | 01-25-2018 |
| 180423000 | Vehicle speed condition only | 2 |
| 20090026002 | Hydraulic Power Steering Apparatus - In a hydraulic power steering apparatus, hydraulic pressure for generating steering assist power is varied by varying opening of a variable throttle portion by movement of a spool. The spool is disposed in a provisional origin by driving a stepping motor in one direction according to a number of steps for setting provisional origin from a position at a time of start of control, and the number of steps at a time of completing of the driving is set to a provisional origin for calculation. In a return to origin permission state where the spool is disposed in a provisional origin and the number of steps from the provisional origin for calculation is zero, a number of steps at a time when the driving of the stepping motor according to a number of steps obtained by subtracting the number of steps for setting provisional origin from a number of steps for setting origin is completed is set to an origin for calculation, and the movement of the spool is stopped at the origin with a stopper. After setting the origin for calculation, a number of steps from the origin for calculation instead of the provisional origin for calculation is set according to the vehicle driving condition for positioning the spool. | 01-29-2009 |
| 20130175111 | POWER STEERING SYSTEM FOR A VEHICLE - In a vehicle including a traction engine designed to drive wheels through a driveline that includes an upstream portion which is connected to the engine and a downstream portion which is permanently connected to the drive wheels, the power steering system includes a hydraulic circuit including a fluid tank and a steering actuator. The power steering system further includes a first pump which is driven by mechanical power from the downstream portion of the driveline, and a second pump which is driven by an electric motor. The first and second pumps are arranged in parallel between the fluid tank and the steering actuator and are capable of supplying fluid from the fluid tank to the steering actuator at the same time. | 07-11-2013 |
