| 摘要 |
A 2-1 kickdown control method for automatic transmission wherein a transmission control unit TCU receives signals regarding three variables for a throttle opening rate just prior to an abrupt operation of the accelerator pedal, the vehicle speed and the throttle opening rate changes during the operation of the accelerator pedal; if the throttle opening rate is lower than 20%, the vehicle speed is lower than 20Km/h and the throttle opening rate change is lower than 30%, the transmission control unit TCU applies to the pressure control solenoid valve a first duty control pattern in which duty rate is constant with respect to time changes from shift start point; and if any one of said variables equal to or higher than the above reference values, the transmission control unit TCU applies to the pressure control solenoid valve a second duty control pattern in which the applied duty rate changes in multi-steps with regard to time change from shift start point. <IMAGE> |
