| 摘要 |
PURPOSE:To reduce a shock when the down-shift is changed to the up-shift at the time of acceleration and obtain smooth acceleration feeling by correcting the change gear speed with the change speed of the target value and the variation between the target value and the actual value. CONSTITUTION:At the time of kick-down acceleration, the target change gear ratio is is set to the low-speed stage side when an accelerator is depressed, the change gear speed di/dt is calculated based on the variation between it and the actual change gear ratio (i), the car speed is controlled with the duty ratio D determined by the relationship between it and the actual change gear ratio, and the actual change gear ratio (i) immediately follows the target change gear ratio is is moved to the up-shift direction according to the response condition of the actual change gear ratio (i) immedi ately after being set on the low-speed stage side. The coefficient K1 is changed in sequence from a large value to a small value based on the variation (is-i) of a variation calculating unit 61, and the change gear speed di/dt is decreased and corrected in sequence. The down-shift speed of the actual change gear ratio (i) is quickly reduced, and it is smoothly converged toward the up-shift direction nearly same as that of the target change gear ratio is. |
