关键词: 无级变速器, 模糊PID控制, 速比控制, 整车仿真

Abstract: Aiming at the engine’s part throttle characteristics and governor control characteristics, this paper proposes methods to determine the target speed ratio of CVT. A simplified model of CVT system is established based on concentrated mass method and a simulation model of the vehicle is built on the Simulink platform. In allusion to the shortcomings of vehicle PID speed ratio control in non-steady-state conditions and combined with the fuzzy control theory, a fuzzy-PID CVT ratio control strategy is proposed. On the basis of the established vehicle model, the vehicle in unsteady conditions is simulated and researched. The results show that, fuzzy-PID speed control can make the actual gear ratio track the target speed ratio well both in the non-steady-state conditions and in steady-state conditions.

Key words: Continuously Variable Transmission（CVT）, fuzzy-PID control, ratio control, whole vehicle simulation