Patent application number | Description | Published |
20100318269 | Closed-Loop Torque Phase Control for Shifting Automatic Transmission Gear Ratios Based on Friction Element Load Estimation - A closed loop shift control apparatus and method based on estimated torque in friction elements controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The estimated torque is preferably calculated by using estimated torque signals generated as a function of speed measurements represented either the engine speed and turbine output speed or transmission output speed and wheel speed under dynamically changing conditions. | 12-16-2010 |
20110172889 | Controlling Wheel Hop in a Vehicle Driveline - A method for controlling wheel-hop in a vehicle driveline includes detecting that a wheel-hop condition occurs upon determining an amplitude and frequency of speed oscillations of a component that transmits power to wheels of the driveline, engaging a transmission friction clutch that transmits torque in the driveline between an engine and the wheels, and modulating requested engine torque. | 07-14-2011 |
20120130608 | Synchronous Automatic Transmission Up-Shift Control Utilizing Input Torque Signal - A synchronous automatic transmission up-shift control utilizes input torque measurements. The input torque is measured during an up-shift having preparatory, torque, and inertia phases. Target input torque profiles for the torque and inertia phases are determined based on the input torque during the preparatory phase. During the torque phase, an engine torque is controlled to cause the input torque to achieve the target profile for the torque phase. During the inertia phase, an on-coming clutch is controlled to cause the input torque to achieve the target profile for the inertia phase. | 05-24-2012 |
20120130610 | Non-Synchronous Automatic Transmission Up-Shift Control Utilzing Input Torque Signal - A non-synchronous automatic transmission up-shift control utilizes input torque measurements. The input torque is measured during an up-shift having preparatory, torque, and inertia phases. Target input torque profiles for the torque and inertia phases are determined based on the input torque during the preparatory phase. During the torque phase, an engine torque is controlled to cause the input torque to achieve the target profile for the torque phase. During the inertia phase, the on-coming clutch is controlled to cause the input torque to achieve the target profile for the inertia phase. | 05-24-2012 |
20120158260 | Automatic Transmission and Method of Control for Rejecting Erroneous Torque Measurements - A method for an automatic transmission includes measuring torque of a component of the transmission using a torque sensor in communication with the component. The torque of the component is estimated from information other than the measured torque. The measured torque is rejected from being used in a control operation of the transmission if the difference between the measured torque and the estimated torque is greater than a selected threshold. | 06-21-2012 |
20120297895 | Magnetic Torque Sensor Packaging for Automatic Transmissions - Designs to package a magneto-elastic torque sensor in an automotive transmission, such as front wheel drive (FWD) automatic transmissions, for volume production applications are provided. | 11-29-2012 |
20130263654 | Transmissions with Electronics Interface Assembly for Torque Sensor - A transmission includes sensors positioned adjacent respective pairs of magnetized bands on a shaft of the transmission for detecting magnetic flux emanating from the bands in response to torque on the shaft. The transmission further includes an electronics interface assembly configured to respectively provide drive signals to the sensors and to receive from the sensors, in response to the drive signals, output signals indicative of the torque on the shaft as detected by the sensors. | 10-10-2013 |
20130311057 | Closed-Loop Torque Phase Control for Shifting Automatic Transmission Gear Ratios Based on Friction Element Load Estimation - A closed loop shift control apparatus and method based on estimated torque in friction elements controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The estimated torque is preferably calculated by using estimated torque signals generated as a function of speed measurements represented either the engine speed and turbine output speed or transmission output speed and wheel speed under dynamically changing conditions. | 11-21-2013 |
20130345022 | CONTROL SYSTEM AND METHOD FOR A VEHICLE TRANSMISSION - A control system for a vehicle transmission includes a controller configured to output a first torque estimate defined in terms of one nonlinear function of a transmission parameter for a particular value of the transmission parameter. The controller also receives a measured torque of the transmission at the particular value of the transmission parameter, and outputs a modified torque estimate for the particular value of the transmission parameter based on the measured torque. | 12-26-2013 |
20140046557 | SYSTEM AND METHOD FOR CONTROLLING A VEHICLE POWERTRAIN - A system and method for controlling a vehicle powertrain includes a controller that is operative to automatically control at least one powertrain function other than engine torque based on a measured torque and a predetermined torque range. The predetermined torque range is based on a first engine torque estimate. The measured torque is related to actual engine torque, and can be measured directly at the engine crankshaft, or in another location in the powertrain and then transferred to the engine space. | 02-13-2014 |
20140069759 | Transmission and Method of Controlling Clutch During Ratio Change - A transmission and control method are disclosed which ensure proper stroke pressure and minimize torque transients during a shift event. The transmission includes a clutch having a torque capacity based on a fluid pressure, a torque sensor adapted to measure a torque value that varies in relationship to the torque capacity, and a controller. The method includes varying the fluid pressure around a predetermined value, measuring a resulting torque difference with the torque sensor, and adjusting a clutch control parameter if the resulting torque difference is less than a threshold value. | 03-13-2014 |
20140080668 | DECELERATION FUEL SHUT OFF SCHEDULING BASED ON VEHICLE PARAMETERS - A method for enacting DFSO in a motor vehicle having an engine and a transmission. The method includes, during a condition of normal engine-braking efficiency, disabling the DFSO below a higher gear of the transmission. During a condition of reduced engine-braking efficiency, by contrast, the DFSO is disabled below a lower gear of the transmission. | 03-20-2014 |
20140081541 | Line Pressure Control with Input Shaft Torque Measurement - A method of controlling a line pressure in a transmission is provided. Line pressure in a transmission is set to a pressure value including a first term that is proportional to an input torque value. The first term has a coefficient of proportionality that is increased in response to a signal indicating clutch slippage. The input torque value is a measured input torque value in a steady-state condition. The input torque value may be a maximum of the measured input torque value and a driver demand torque value in a transient condition. | 03-20-2014 |
20140148304 | Adjusting Clutch Slip Based on Sensed Parameter of Transmission Shaft to Control NVH Level in Vehicle Powertrain - A vehicle powertrain includes a transmission and a clutch. The slip of the clutch is adjusted to a target where a magnitude of a sensed parameter of a shaft of the transmission corresponds to a desired noise, vibration, and harshness (NVH) level in the powertrain. The sensed parameter of the transmission shaft may be one of acceleration, speed, and torque of the transmission shaft. The transmission shaft may be one of the input shaft and output shaft of the transmission. | 05-29-2014 |
20140200789 | DRIVER FEEDBACK FOR VEHICLE OPERATION - The following description relates to systems and methods for adjusting vehicle response parameters in response to indications of vehicle operator preferences. In one example approach, a method comprises, during a cruise control mode of operation, adjusting a vehicle response parameter from a default set-point based on an indication of vehicle operator preference. | 07-17-2014 |
20140230570 | Magnetic Sensor Packaging for Transmissions - Designs to package a magneto-elastic torque sensor in an automotive transmission for volume production applications are provided. One transmission includes an output shaft and a magnetic torque sensor. The output shaft has a magnetized region. The sensor, for detecting torque of the output shaft, is mounted on friction reduction members such as bushings supporting the output shaft. In another transmission, the sensor is alternatively mounted to a transmission case. | 08-21-2014 |
20140244120 | Vehicle Mass Computation - A vehicle having a drivetrain is controlled based on a difference between a torque transmitted by the drivetrain when the vehicle has constant non-zero speed and the torque transmitted by the drivetrain when the vehicle is accelerating. The drivetrain torque may be measured by a drivetrain torque sensor. The effective vehicle mass is computed from the torque difference. The computed mass of the vehicle is used to adjust the activation of a collision warning system or a collision avoidance system. A method of operating a vehicle where the activation of a collision avoidance system is adjusted based on a difference between a torque transmitted by a drivetrain when the vehicle has constant non-zero speed and the torque transmitted by the drivetrain when the vehicle is accelerating is disclosed. The torque difference is used to compute a vehicle mass that is used to adjust a collision warning distance. | 08-28-2014 |
20140274555 | AUTOMATIC TRANSMISSION SHIFT CONTROL BASED ON TRANSMISSION INPUT SHAFT TORQUE SIGNAL - A system and method for minimizing torque disturbances during a shift event for an automatic transmission control actual transmission input shaft torque using a transmission input shaft signal produced by an input shaft torque sensor. The torque sensor provides a signal to a controller that monitors the measured transmission input torque. The torque sensor may be implemented by a strain gauge, a piezoelectric load cell, or a magneto-elastic torque sensor. The system may include a vehicle powertrain having an engine, a transmission coupled to the engine via a torque converter, an input torque sensor coupled to the input shaft of the transmission and a controller configured to control engine torque to cause the measured transmission input shaft torque to achieve a target transmission input shaft torque during the shift event. | 09-18-2014 |
20140274556 | AUTOMATIC TRANSMISSION SHIFT CONTROL BASED ON TORQUE PHASE DETECTION USING MEASURED TRANSMISSION INPUT TORQUE - A system and method for controlling a vehicle powertrain having a transmission to improve shift quality to detect the start of a torque phase of the shift based on a measured transmission input shaft torque. A torque sensor provides a signal to a controller that monitors initial rise time of the measured transmission input shaft torque. The torque sensor may be implemented by a strain gauge, a piezoelectric load cell, or a magneto-elastic torque sensor. The system may include a vehicle powertrain having an engine, a transmission coupled to the engine via a torque converter and a controller configured to initiate torque phase control when the slope of the transmission input shaft torque exceeds a predetermined threshold after initiation of the shift preparatory phase. | 09-18-2014 |
20140318272 | Sensor Packaging at Output Side of Front Wheel Drive (FWD) Transmissions - Various packaging designs for placement of a magnetic torque sensor at the output shaft of a front wheel drive transmission are provided. One design provides for mounting a sensor on a chain drive sprocket or integrating a sensor into a modified sprocket bearing mount. Another design provides for mounting a sensor at the grounded ring gear of a final planetary drive. Another design provides for mounting a sensor at the differential housing. Another design provides for mounting a sensor at the output planetary carrier hub/park gear. Another design provides for mounting a sensor at a multi-piece transfer gear face. | 10-30-2014 |
20140324308 | CONTROL OF A TRANSMISSION FRICTION ELEMENT USING AN ADAPTIVE TRANSFER FUNCTION - A transmission clutch control method includes defining a transfer function relating clutch torque to a control signal under transmission operating conditions; determining a target clutch torque for current operating conditions; determining the target control signal from the transfer function to produce target torque at the clutch; correcting clutch torque on the basis of a difference between the target clutch torque and the actual torque at the clutch by adjusting the control signal; calculating actual clutch torque with reference to transmission input torque and transmission output torque; computing a clutch torque error as a difference between calculated clutch torque and the target clutch torque; and repetitively adjusting the transfer function on the basis of the clutch torque error. | 10-30-2014 |
20140350810 | Transmission and Method of Controlling Clutch During Ratio Change - A transmission and control method are disclosed which ensure proper stroke pressure and minimize torque transients during a shift event. The transmission includes a clutch having a torque capacity based on a fluid pressure, a torque sensor adapted to measure a torque value that varies in relationship to the torque capacity, and a controller. The method includes varying the fluid pressure around a predetermined value, measuring a resulting torque difference with the torque sensor, and adjusting a clutch control parameter if the resulting torque difference is less than a threshold value. | 11-27-2014 |
20140365085 | SKIP-SHIFT OPERATIONS FOR AUTOMATIC TRANSMISSION SYSTEMS - Method and system providing manual skip-shift for operating the automatic transmission of a vehicle. The method includes accepting the input of gear states by operating a selector mechanism to select a value. The system accepts input of a selected sequence of gear states from a plurality of available gear states, the selected sequence including fewer gear states than the number of available gear states. The system then operates a selector mechanism to select the gear state from the selected sequence. The system also includes an electronic control module, a selector mechanism, and a power train control module. | 12-11-2014 |
20150024904 | Adjusting Clutch Slip Based on Sensed Parameter of Transmission Shaft to Control Vehicle NVH - A vehicle powertrain includes a transmission and a clutch. The slip of the clutch is adjusted to a predefined target where a sensed parameter of a shaft of the transmission corresponds to a specified noise, vibration, and harshness (NVH) level in the powertrain. The sensed parameter of the transmission shaft may be one of acceleration, speed, and torque of the transmission shaft. The transmission shaft may be one of the input shaft and output shaft of the transmission. | 01-22-2015 |
20150066316 | METHODS AND SYSTEMS FOR OPERATING A TRANSMISSION - Systems and methods for operating and interfacing to a transmission of a vehicle are presented. In one example, a human machine interface allows a driver to assign gear ratios or simulated gear ratios to gear position slots of a shifter. The assignment of gear ratios to gear position slots of a shifter may allow a driver to experience the feeling of driving a manually shifted transmission without having to operate a clutch. | 03-05-2015 |