Importance

Loading Importance Indicators...

Abstract

A basic speed change ratio of a continuously variable transmission is set depending on operation conditions, a target speed change ratio that follows the basic speed change ratio at a predetermined rate of changing the speed is obtained, and the speed change ratio is controlled according to the target speed change ratio. Based on the basic speed change ratio and the target speed change ratio, furthermore, a rate of progress in the change of speed is operated according to rate of progress=1--(.vertline.basic speed change ratio--target speed change ratio.vertline.)/basic speed change ratio. Based on the rate of progress and the throttle opening degree, the up-shift is discriminated to be in any one of a first up-shift mode where the throttle opening degree is maintained constant, a second up-shift mode where the throttle is fully closed or a third up-shift mode where the throttle is closed to a half opened state to shift the acceleration to a steadily traveling state. Different rates of changing the speed are set for these up-shift modes.

Loading the Abstract Image...

First Claim