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 second speed region of the upshift shift stage after the accelerator pedal off, and the shift stage is the upshift shift stage. If the throttle is in the power-off state smaller than the set reference voltage, the 2nd speed control at the kickdown 3rd speed is delayed for the set time and then returned to the accelerator pedal off control. When the shift stage enters the third speed region of the upshift shift stage, it is determined whether the shift stage enters the third speed region of the upshift shift stage after the SB point. When the power off state is lower than the set reference voltage, the 2nd speed control at the kickdown 3rd speed is returned to the accelerator pedal off control after the delay for the set time, and the final shift stage is set at 3rd speed, so that the shock is shifted during the shift of the automatic transmission vehicle. It is effective to improve the riding comfort by preventing the durability of the automatic transmission.