Lockup control system for torque converter

摘要

A lockup control system for a torque converter of a vehicle equipped with an air conditioner. The lockup control system maintains a coasting slip restricted state of the torque converter even during coasting of the vehicle with an accelerator pedal released, for restricting slip rotation between input and output elements of the torque converter. The coasting slip restricted state is achieved by a coasting lockup capacity that is lower than a lockup capacity of the torque converter in a driving condition of the vehicle with the accelerator pedal depressed. According to the invention, the coasting lockup capacity is controlled according to an operation load of the air conditioner and increased as the operation load of the air conditioner increases.