Kickdown 3-speed 2-speed control method of automatic transmission

摘要

The present invention relates to a method for controlling a two-speed shift from a three-speed kickdown of an automatic transmission, and before the shift stage is actually shifted to the target shift stage, that is, before the SB point, during the two-speed control from the kickdown three-speed while the vehicle is driving. It is judged whether the shift stage enters the 2nd and 3rd speed range of the upshift shifting stage by the accelerator pedal off, and then it is judged whether the throttle is the power-off state smaller than the set reference voltage, and then the shifting stage is returned to the 3rd speed, The duty cycle is controlled to 0% to return the final shift stage to 3 speeds, and after the SB point, it is determined whether the shift stage enters the 2nd speed range of the upshift shift stage by the accelerator pedal off. In case of entering the 2nd speed range of the stage, if the throttle is in the power-off state less than the set reference voltage, the 2nd speed control at the kickdown 3rd speed is delayed for the set time, and then the shift stage is upshifted by the accelerator pedal off control. When the shift stage enters the 3-speed range of the upshift shift stage, when the throttle is in the power-off state smaller than the set reference voltage, the 2nd speed control is set at the kick-down 3-speed range. By returning to the accelerator pedal off control after the delay, and setting the final gear speed to 3 speed, it is possible to prevent shift shock during shifting of the automatic transmission vehicle, thereby improving riding comfort and improving durability of the automatic transmission.