Lock-up control apparatus for automatic transmission

Details Lock-up control apparatus for automatic transmission Lock-up control apparatus for automatic transmission

1995-07-07

1997-09-16

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Clutch control

With fluid drive

477 62, 477118, B60K 4102

Patent

active

056674589

ABSTRACT:
A lock-up control apparatus for a vehicle automatic transmission enables an engine stalling prevention at the time of a sudden deceleration in the lock-up state of a torque converter without causing the slip of the torque converter before the sudden deceleration, and prevents effectiveness of the fuel consumption from being sacrificed by a fuel cut. A controller performs the change-speed control on an automatic transmission through shift solenoids and on the basis of a throttle opening and a transmission output speed, and also performs the lock-up control of the torque converter through a lock-up solenoid. During the coasting drive when the throttle opening is set close to zero, the controller sets the torque converter to have a minimum lock-up capacity through the lock-up solenoid within such a range that no slip occurs. When the sudden deceleration is carried out, the controller releases the lock-up, though this lock-up release is rapidly achieved with the minimum lock-up capacity thereby to avoid the engine stalling.

REFERENCES:
patent: 4768635 (1988-09-01), Sakurai et al.
patent: 5325946 (1994-07-01), Kashiwabara et al.
"Service Manual for Nissan RE4R01A-Type Full-Range Electronically-Controlled Automatic Transmission" Issued by Nissan Motor Co., Ltd. (1987).

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