Engine restart and vehicle start control apparatus in transmission unit

摘要

A transmission unit is composed of an engine E, a torque converter TC, and an automatic transmission TM. The engine restart and vehicle start control apparatus comprises an electromagnetic valve capable of calculating the pump impeller suction torque of the torque converter and setting the oil pressure increase ratio for the oil pressure supplied to the vehicle start clutch. When the engine is restarted from an engine stopped state and the vehicle start stage is set by supplying hydraulic oil to a friction engagement element and engaging the friction engagement element, an oil pressure supply increasing at a first oil pressure increase ratio is conducted till the calculated pump impeller suction torque reaches the prescribed criterial value, and an oil pressure supply increasing at a second oil pressure increase ratio which is less than the first oil pressure increase ratio is conducted from the instant the calculated pump impeller suction torque becomes greater than the prescribed criterial value.