Control system for automatic transmission.

摘要

A control system for an automatic transmission (2) comprising a torque converter (2a) having an input and output members through which a driving power is transmitted, a lock-up clutch (2c) provided in the torque converter (2a) for connecting the input and output member without intervening a hydraulic fluid, a multiple stage transmission gear mechanism connected with the output member of the torque converter (2a) and having a plurality of shift gear stages, a shift control device (5) for shifting the shift gear stage in accordance with a vehicle operating condition, an engaging force control device for controlling an engaging force of the lock-up clutch (2c) in a manner that a slip rate of the lock-up clutch (2c) is changed, an acceleration judging device (59) for judging a required acceleration, and the engaging force control device reducing the engaging force as the required acceleration is increased. The control is made in a manner that the driving power transmitted through the automatic transmission (2) is continuously changed in accordance with the required acceleration. Both acceleration performance and fuel consumption performance can be improved.