Automatic transmission lockup control apparatus

Details Automatic transmission lockup control apparatus Automatic transmission lockup control apparatus

1997-04-30

2000-04-11

Zanelli, Michael J.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Clutch control

701 58, 477169, F16H 6114

Patent

active

060497521

ABSTRACT:
A lockup control apparatus for use with an automotive vehicle including an engine, an automatic transmission and a torque converter having a lockup clutch operable on a variable engagement force to provide a controlled degree of mechanical connection between the engine and the automatic transmission during deceleration. The lockup engagement force is set at a target value substantially equal to a first value calculated based on vehicle operating conditions plus a second value calculated based on engine output at a first stage of lockup control operation when the engine output remains positive after the driver's operation is detected and it is decreased at a predetermined rate to the first value at a second stage of lockup control operation after the engine output becomes negative.

REFERENCES:
patent: 5115897 (1992-05-01), Yoshimura et al.
patent: 5325946 (1994-07-01), Kashiwabara et al.
patent: 5520594 (1996-05-01), Fukasawa et al.
patent: 5547438 (1996-08-01), Nozaki et al.
patent: 5588937 (1996-12-01), Kono et al.
patent: 5616099 (1997-04-01), Sakai
patent: 5649881 (1997-07-01), Iizuka
patent: 5667458 (1997-09-01), Narita et al.

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