CONTROLLER FOR VEHICULAR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of shock owing to sudden change of torque at the acceleration time from deceleration operation state with lock-up of torque converter. SOLUTION: A lock-up solenoid is selected at duty ratio = 95% (S8) where stable complete engaging state is secured in the case of an idle switch being OFF and in the case of the idle switch being ON, engagement force is weakened by selecting duty ratio of smaller value DH (DH<95) than the case of being OFF (S4) in the lock-up region of a torque converter. In the case the idle switch is shifted from ON to OFF, the duty ratio is kept in the same value as in the case of ON (S5-S7) for prescribed time to eliminate the sudden change of output torque of engine by the torque converter at the time of acceleration from deceleration operation state.