Gm Global Technolgoy Operations, Inc.

Timothy R Stockdale

Dongxu Li

Matthew D Whitton

David Chris Webert

Shawn M Harris

Todd R Berger

Joel H Gunderson

Nathaniel E Wilke

Colin Hultengren

James L Abington

Amanda P Igel

Mark S Reinhart

Chet Daavettila

Leanne F Giardini

A method for supporting car wash mode of a vehicle with internal electronic transmission range selection includes entering the vehicle into car wash mode with the engine off and the transmission in the Neutral position. Next, the method continues with monitoring the vehicle for misuse of car wash mode, and transitioning the vehicle transmission to Park from Neutral when misuse of car wash mode is detected.

Method for supporting car wash mode of vehicles with internal electronic transmission range selection

A continuously variable transmission, a control system, and a method are provided. The control system and method are configured to learn a desired running pressure to be applied to a clutch that is lower than a pulley clamping pressure and higher than a pressure at which the clutch would slip (a clutch critical pressure), so that the clutch can act as a fuse to avoid pulley slip. A plurality of clutch slip tests are performed, each of which include decreasing pressure supplied to the clutch until a clutch slip occurs. Clutch slip data points are collected at the point of slip and used to determine a gain and an offset, where the gain is a clutch pressure versus clutch torque capacity gain, and the offset is a clutch pressure offset, which is used to determine the clutch critical pressure.

Adaptive clutch slip learning for critical capacity clutch fusing in a continuously variable transmission

A system for a vehicle includes a desired pressure module, a valve actuation module, a filter module, and a capacity detection module. The desired pressure module selectively generates an increase in a desired pressure of hydraulic fluid for a clutch of an automatic transmission. The valve actuation module actuates a solenoid valve based on the desired pressure. The solenoid valve supplies hydraulic fluid to a regulator valve, and the regulator valve supplies hydraulic fluid to the clutch. The filter module filters an acceleration of a shaft of the automatic transmission to generate a filtered acceleration. The capacity detection module indicates whether the clutch reached torque carrying capacity based on the filtered acceleration.

Clutch capacity detection systems and methods

A vehicle includes an engine, a transmission, and a controller. The transmission includes a pressure control solenoid (PCS) valve device having a PCS and a regulating valve, a friction clutch, and a clutch piston in fluid communication with the regulating valve. The piston is operable to apply a clutch pressure to the friction clutch during a shift of the transmission. The controller is programmed to receive an acceleration value describing a lateral and/or longitudinal acceleration force of the vehicle, calculate the clutch pressure using the received acceleration value, and control an operation of the regulating valve via the PCS using the calculated clutch pressure. The acceleration value may be determined via one or more accelerometers or calculated. A method is also disclosed for compensating for acceleration in control of the regulating valve in a vehicle having a transmission that includes a friction clutch, PCS, and regulating valve.

Transmission with acceleration-compensated valve control

A control system for a transmission of a vehicle includes a first angular rotation module, a second angular rotation module, and a lash module. The first angular rotation module determines a first angular rotation of a first shaft during a first predetermined period based on a first signal generated by a first shaft sensor. The second angular rotation module determines a second angular rotation of a second shaft during the first predetermined period based on a second signal generated by a second shaft sensor. The lash module selectively detects lash between gears of the transmission based on the first angular rotation and the second angular rotation.

System and method for detecting lash in a transmission and controlling an engine and/or a motor based on lash detections

A control system for a transmission of a vehicle includes a first angular rotation module, a second angular rotation module, and a slip module. The first angular rotation module determines a first angular rotation of a first component of the transmission during a predetermined period based on a first signal generated by a first sensor. The second angular rotation module determines a second angular rotation of a second component of the vehicle during the predetermined period based on a second signal generated by a second sensor. The slip module selectively indicates that a clutch of the transmission is slipping based on the first angular rotation and the second angular rotation.

Clutch slip identification systems and methods

A control system for a transmission includes a pressure control module and a pressure adapt module. The pressure control module operates a hydraulic control system of the transmission at a target pressure during steady-state operation of the transmission. The target pressure is based on first and second learned pressures for different predetermined first and second torque ranges. The pressure adapt module selectively adjusts at least one of the first learned pressure and the second learned pressure based on a first pressure at which a slip condition of the transmission occurs. The first and second learned pressures define a learned pressure gain and offset. When adjusting the first and second learned pressures, the pressure adapt module limits increases and decreases in the learned pressure gain offset based on a predetermined pressure gain and offset. A method is also provided.

Growing community of inventors

Brighton, MI, United States of America

Timothy R Stockdale