Patent ID: 6709363
Filing Date: 2004-03-23
Classification: B60W,F16H,Y10T

Abstract:
An engine restart and vehicle start control apparatus in a transmission unit comprising an engine that can be stop controlled under prescribed conditions, a torque converter connected to an output shaft of said engine, and a speed change mechanism which is connected to an output shaft of said torque converter and changes the speed and transmits the output rotation thereof, said speed change mechanism comprising a friction engagement element which is engaged and actuated by receiving a hydraulic force when the vehicle is started and sets a vehicle start stage;wherein this transmission unit comprises pump impeller suction torque calculating means for calculating the pump impeller suction torque of said torque converter, and oil pressure supply control means that can set an increase ratio of the oil pressure supplied to said friction engagement element and wherein, when said engine is restarted from an engine stopped state and hydraulic fluid is supplied to said friction engagement element and said friction engagement element is engaged, said oil pressure supply control means conducts oil pressure supply at a first oil pressure increase ratio to said friction engagement element till the calculated pump impeller suction torque reaches a prescribed criterial value, and conducts oil pressure supply at a second oil pressure increase ratio which is less than said first oil pressure increase ratio from the instant said calculated pump impeller suction torque becomes higher than said prescribed criterial value.