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

1998-03-10

Marmor, Charles A.

Machine element or mechanism

Gearing

Plural power paths from prime mover

74336B, 74665GE, 74720, 74721, 192 489, 475210, 475214, F16H 3702

Patent

active

057248664

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 hanging 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: 4458558 (1984-07-01), Frank
patent: 4548100 (1985-10-01), Hohn
patent: 4736652 (1988-04-01), Shimamoto
patent: 4856369 (1989-08-01), Stockton
patent: 4901597 (1990-02-01), Hattori et al.
patent: 5088352 (1992-02-01), Ishimaru

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