Torque converter lockup strategy

Details Torque converter lockup strategy Torque converter lockup strategy

1998-01-16

2000-07-04

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 58, 701 53, 701 64, 477 45, 477 46, 477 44, 477 48, 477169, 477 62, 477118, 192 33, 192331, 192 0076, G06F 1900, F16H 5900

Patent

active

060851368

ABSTRACT:
According to a torque converter lockup control, a lockup actuator, including a lockup solenoid, is operative responsive to an output command signal issued by a controller to adjust lockup clutch engagement force to a commanded value. The lockup clutch engagement force is a force with which the lockup clutch is engaged. The controller determines the commanded value as a function of a deviation between a current value of slip speed within the torque converter and a desired value thereof. For preventing the lockup clutch from shifting deeply into its converter position when the deviation persists to stay in the neighborhood of zero, the controller sets a limit to the determined commanded value during operation of the lockup clutch in the slip lockup mode.

REFERENCES:
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 5086894 (1992-02-01), Iizuka et al.
patent: 5219055 (1993-06-01), Imamura
patent: 5507372 (1996-04-01), Boardman et al.
patent: 5588937 (1996-12-01), Kono et al.
patent: 5643136 (1997-07-01), Kono et al.

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