METHOD OF CONTROLLING CONTINUOUS VARIABLE TRANSMISSION

摘要

A method of controlling a continuously variable transmission (4) which includes a fixed pulley member (6,12) and a movable pulley member (8,14) supported relative to the fixed pulley member (6,12) so as to be movable both toward and away from the fixed pulley member (6,12),including the steps of decreasing and increasing the width of a groove defined between the pulley members (6,8,12,14) to thereby respectively increase and decrease a rotational radius of a belt (2A) which is reeved between the pulley members (6,8,12,14) in the groove. When a target engine rotational speed based on throttle opening degree and vehicle velocity changes during vehicle running, a transient speed change control is performed so as to change the transmissionratio based on a predetermined rate limit value. A control unit (84) is provided for receiving the throttle opening degree and vehicle velocity input 5 and executing the transient speed change control. During execution of the transient speed change control, the rate limit value is changed in accordance with the throttle opening degree and vehicle velocity, the throttle opening is changed on the basis of vehicle velocity, and the final target engine rotational speed is changed on the basis of the rate limit value. A time limit for execution of transient control is set on the basis of the throttle opening degree and the vehicle velocity.