Method and an apparatus for controlling a car equipped with an a

Details Method and an apparatus for controlling a car equipped with an a Method and an apparatus for controlling a car equipped with an a

1996-08-21

1997-10-28

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Engine ignition control for transmission change

477107, 477111, 477121, B60K 4104

Patent

active

056812388

ABSTRACT:
The present invention relates to a method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch. According to the control method of the present invention, when the lockup clutch is in the lockup state, a variation of a generated torque is detected. When the range of the torque variation detected exceeds a predetermined value, an engine torque is reduced by controlling the engine, and the automatic transmission is controlled to compensate for a reduction of the driving torque due to a reduction of the engine torque. Thus, the speed change ratio is changed to the low gear side. The control unit of the present invention includes a unit for controlling an output torque of an engine according to a command value, a unit for changing the transmission ratio of the automatic transmission, a unit for detecting a variation of the engine torque, a unit for deciding a target driving torque, a unit for reducing a torque command value when the range of a detected variation of the torque has exceeded a predetermined value when the lockup clutch was in the lockup state, and a unit for deciding a transmission ratio at which the reduction of the driving torque due to the reduction of the engine torque is compensated for.

REFERENCES:
patent: 4484497 (1984-11-01), Hibino
patent: 4580465 (1986-04-01), Omitsu
patent: 4735114 (1988-04-01), Satoh et al.
patent: 5150635 (1992-09-01), Minowa et al.
patent: 5191953 (1993-03-01), Ito et al.
patent: 5385517 (1995-01-01), Hara et al.
patent: 5580330 (1996-12-01), Minowa et al.

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