| 摘要 |
A ratio control for a continuously variable transmission is disclosed. In this control, a speed sensor detects a wheel speed of a driving road wheel drivingly coupled with the continuously variable transmission, and the sensor output, namely a speed indicative signal indicative of the wheel speed detected, is used in conjunction with an engine load indicative signal in deriving a target value in a predetermined reduction ratio dependent variable, such as a turbine speed. Then, an actuator effects a shift in reduction ratio in such a direction as to bring an actual value in the predetermined reduction ratio dependent variable into agreement with the target value. During braking condition, the speed indicative signal may drop to zero or a small value owing to a wheel slip, resulting in a change in target value which causes a shift toward the maximum reduction ratio. For improved recovery from the wheel slip condition upon release of the brake, an estimated vehicle speed is used instead of the speed indicative signal in deriving the target value after the brake has been depressed.
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