CONTROL SYSTEM FOR A MULTIPLE RATIO TRANSMISSION HAVING A LOCKUP CLUTCH TORQUE CONVERTER

摘要

A control valve system for an automatic transmission having a hydrokinetic torque converter (16), a lockup clutch (28) in the torque converter for mechanically bypassing the hydrokinetic torque flow path, speed and torque responsive valves for effecting ratio changes in the transmission, a bypass clutch control valve (530/540) for engaging and disengaging the lockup clutch (28) and a converter bypass valve (586) for triggering operation of the bypass clutch control valve, the bypass clutch control valve (586) being responsive to input torque and speed signals received in a control module (588).