Adaptive line pressure control for an electronic automatic trans

Details Adaptive line pressure control for an electronic automatic trans Adaptive line pressure control for an electronic automatic trans

1994-01-21

1995-10-17

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477161, B06K 4110

Patent

active

054585457

ABSTRACT:
The present invention provides a method and apparatus for controlling the hydraulic line pressure in an automatic transmission for a vehicle in response to the torque transmitted through the transmission such that a minimum hydraulic line pressure is provided to the frictional elements to achieve a no-slip condition through the transmission increasing transmission efficiency, thereby increasing the fuel economy of the vehicle. Hydraulic line pressure is controlled by activating a solenoid activated valve which allows fluid recirculation from the high-pressure side of the hydraulic pump to the low-pressure side of the pump. Control signals are generated based on engine speed, turbine speed, output speed (vehicle speed), hydraulic line pressures, driver selected gear, the operating gear and the torque converter operating condition for energizing the solenoid-actuated valve. The present invention further provides closed-loop adaptive control technology to learn the minimum line pressure requirements to compensate for production variability of clutch return springs, friction characteristics, surface finishes and flatness, as well as hydraulic response resulting from valve body part variation, wear, and changes over the life of the transmission.

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McKenny, et al.; General Motors All New Electronic Transverse FWD Automatic Transaxle(4T80-E); Presented at International Congress and Exposition Mar. 1-5, 1993; pp. 42-43.

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