Patent ID: 7693636

Claim:
A drive control system for an automatic vehicle, comprising: an engine; an automatic transmission; a torque converter disposed between the engine and the automatic transmission; an oil pump driven in synchronism with the engine; a start clutch engaged under a hydraulic oil pressure discharged from the oil pump to allow torque transmission from the engine to the automatic transmission via the torque converter at a start of the vehicle; an engine control unit that controls an output torque of the engine; a hydraulic pressure control unit that regulates the hydraulic oil pressure to control an engagement state of the start clutch; an automatic engine stop/restart control unit that stops the engine upon satisfaction of certain vehicle conditions and restarts the engine upon dissatisfaction of the certain vehicle conditions; and a torque transmission control unit configured to: calculate a target clutch engagement time and a final target clutch engagement torque of the start clutch based on an accelerator opening of the vehicle; calculate a transient target engine clutch engagement torque based on the target clutch engagement time and the final target clutch engagement torque; and cause the hydraulic pressure control unit and the engine control unit to control the engagement state of the start clutch and the output torque of the engine according to the transient target clutch engagement torque, at a restart of the engine.