Aiming at a certain motorcycle type equipped with the metal-belt continuously variable transmission（CVT）

torque model and fuel consumption model of its engine are established which provides target curves concerning to rotation speed adjustment features.Then after the aimed speed ratios of CVT was acquired

the driveline model is simplified in a mass-concentration method.Based on the fuzzy-PID principles

a fuzzy-PID control algorithm to optimize the performance is put forward where speed ratio change rate of CVT is regarded as the control object.In the platform of simulink

simulation is done for the auto model with CVT containing this algorithm in variable cases of starting-up

accelerating and braking.The results could demonstrate that the real ratio can follow the target ratio exactly as expected.