Patent ID: 6645122
Filing Date: 2003-11-11
Classification: B60W,F16H,Y10T

Abstract:
A control system for an automatic transmission having an input shaft and an output shaft comprising:a torque converter disposed between a driving power source and a speed change gear unit to hydraulically transmit rotation of the driving power source to the speed change gear unit; a first friction engagement element engageable to connect the torque converter and the speed change gear unit; a second friction engagement element engageable to perform a forward driving shift stage in the speed change gear unit; a third friction engagement element engageable to generate an engaging force to prevent the output shaft from being rotated in a reverse direction; vehicle stopping detecting means for detecting a vehicle stopped condition when a forward driving range is selected; vehicle weight detecting means for detecting a weight of the vehicle; and control means for controlling a disengaging operation of the first and second friction engagement elements and an engaging operation of the third friction engagement element with the engaging force in response to the vehicle weight detected by the vehicle weight detecting means when the vehicle stopped condition is detected by the vehicle stopping detecting means while the forward driving range is selected.