A method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch

摘要

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 (5) for controlling an output torque of an engine (2) according to a command value, a unit (8) for changing the transmission ratio of the automatic transmission, a unit (3) for detecting a variation of the engine torque, a unit (7) for deciding a target driving torque, a unit (4) 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 (4) for deciding a transmission ratio at which the reduction of the driving torque due to the reduction of the engine torque is compensated for.