Interrelated power delivery controls – including engine control – Clutch control – With fluid drive
Patent
1995-12-12
1997-03-11
Wright, Dirk
Interrelated power delivery controls, including engine control
Clutch control
With fluid drive
477171, B60K 4102
Patent
active
056095511
ABSTRACT:
An improved lockup control system for a lockup-type torque converter including a lockup clutch performs a lockup releasing control of the lockup clutch with a satisfactory response characteristic at any input torque of the torque converter without causing a lockup releasing shock. The control system includes a controller which is operative when the driving condition of a vehicle as represented by the throttle valve opening and the vehicle speed is judged to belong to a lockup releasing region, to reduce the differential pressure across the lockup clutch for disengaging the lockup clutch and thereby releasing the lockup. On such occasion, in the first place, the differential pressure is set to an initial differential pressure immediately before the lockup clutch begins to slip, depending upon the input torque of the torque converter at the instant of the lockup releasing command. Subsequently, the differential pressure is gradually reduced from the initial differential pressure to become zero after the lapse of a predetermined time.
REFERENCES:
"Service Manual for Nissan RE4R01A-Type Full-Range Electronically-Controlled Automatic Transmission" issued by Nissan Motor Co., Ltd. (1987).
Nissan Motor Co,. Ltd.
Wright Dirk
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