Control system for vehicle automatic transmission

Details Control system for vehicle automatic transmission Control system for vehicle automatic transmission

1996-02-13

1998-04-28

Tai, Khoi Q.

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

477175, 701 57, 701 68, F16H 6114, F16H 5906

Patent

active

057438293

ABSTRACT:
A control system of a lockup clutch of a torque converter of a vehicle automatic transmission. A basic manipulated variable is determined in response to the vehicle operating condition in accordance with a predetermined characteristic, and the lockup clutch engaging force is controlled in response to the variable. In the system, fuzzy reasoning is carried out using the detected vehicle operating parameters to correct the basic manipulated variable, and the engaging force is controlled in response to the corrected manipulated variable, when the control condition is met. The corrected manipulated variable is gradually decreased with respect to time when the vehicle driving state has shifted from a region in which the engaging force is controlled in response to the corrected manipulated variable to a region in which the lockup clutch is disengaged. In addition, the corrected manipulated variable is gradually increased when the vehicle driving state has shifted from a region in which the lockup clutch is disengaged to a region in which the engaging force is controlled in response to the corrected manipulated variable.

REFERENCES:
patent: 5095435 (1992-03-01), Tokoro et al.
patent: 5267158 (1993-11-01), Sakaguchi et al.
patent: 5627750 (1997-05-01), Kono et al.

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