Transmission Detent Shift Control with Acceleration-Based Compensation

摘要

An improved detent shift control in which upshift initiation is adjusted in relation to the engine acceleration and the expected shift delay time so that the engine speed limit is not exceeded. Data recorded in the course of the shift is analyzed upon completion of the shift, and the control adaptively adjusts the expected delay time if a significant timing error is detected. Whenever the engine throttle position exceeds a detent threshold, a shift trigger speed for the next higher gear is determined by subtracting a delay-based speed from the desired engine shift speed. The delay-based speed is determined according to the product of the engine acceleration and the stored delay time. The shift is initiated when the engine speed reaches the trigger speed so that the engine speed is prevented from exceeding the desired shift speed. If data collected during the shift reveals that the actual shift speed significantly deviated from the desired shift speed, the controller develops and stores a temperature-based adaptive delay time correction for that shift type. In subsequent detent upshifting to the same gear, the delay time correction is combined with the stored empirical delay time in the determination of the shift trigger speed.