Apparatus for controlling a direct drive clutch for a vehicle automatic transmission

摘要

An automatic transmission includes a torque converter with a direct drive clutch and at least one planetary gear unit, and is controlled electronically. The engagement of the direct drive clutch is controlled, independently of a first relation between the vehicle speed and the engine torque to perform shifting, on the basis of a second relation between the vehicle speed and the engine torque. The direct drive clutch can be engaged in each forward running shift postion, and is disengaged at the time of shifting for a predetermined time. Line pressure from a main regulator valve is modulated when the direct drive clutch is engaged.