Slip control apparatus for motor vehicle lock-up clutch

Details Slip control apparatus for motor vehicle lock-up clutch Slip control apparatus for motor vehicle lock-up clutch

1995-07-18

1997-03-18

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

477169, F16H 6114

Patent

active

056117507

ABSTRACT:
An apparatus for controlling the amount of slip of a lock-up clutch between pump and turbine impeller of a torque converter or other fluid-filled power transmitting device in a motor vehicle, the lock-up clutch including a piston which is operated by a pressure difference between pressures in two oil chambers on the opposite sides of the piston, and the apparatus including a slip control device for controlling the lock-up clutch according to a slip control output such that the actual slip of the lock-up clutch coincides with a target slip speed, and an output oscillating device for oscillating the slip control output to oscillate the pressure difference without vibrating the piston. The slip control output is oscillated preferably when the pressure difference is relatively small, for example, when the torque of the lock-up clutch is smaller than a threshold or the vehicle deceleration rate is higher than a threshold, or when the target slip speed determined depending upon the vehicle running condition is almost equal to the actual slip speed.

REFERENCES:
patent: 4947734 (1990-08-01), Fujita et al.
patent: 5029087 (1991-07-01), Cowan et al.
patent: 5141089 (1992-08-01), Nobumoto et al.
patent: 5303616 (1994-04-01), Palansky et al.
patent: 5341703 (1994-08-01), Palansky et al.
patent: 5417622 (1995-05-01), Asayama et al.

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