| 摘要 |
PURPOSE: A hydraulic control method of an automatic transmission vehicle is provided to perform kick down promptly, and to improve endurance by outputting the compensation duty with calculating engine torque and turbine torque in applying a kick down signal after lift-foot-up. CONSTITUTION: A TCU(Transmission Control Unit) detects the throttle opening degree, engine RPM(Revolution Per Minute) and turbine RPM from sensors(S100). The decision of kick down during lift-foot-up is detected with comparing(S200). Turbine torque is output with calculating the speed rate of a torque converter and the torque rate from the predetermined map(310). The equation of the slip torque of a release member and hydraulic pressure is calculated(S321). The D-value is calculated for the slip torque of the release member to be more than the turbine torque(S330), and the duty compensation value is operated with subtracting the D-value from the present duty(S340). An output signal is transmitted to a hydraulic control valve with increasing hydraulic pressure as the calculated duty compensation value. Shifting is performed promptly in applying the kick down signal during lift-foot-up, and endurance is improved.
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