基于模糊PID控制的可变配气相位控制系统仿真研究

将模糊PID系统(Fuzzy-PID)用于现在主流使用的液压控制连续可变配气相位正时系统(VCT)．对连续可变凸轮相位器系统进行了分析，建立了系统的数学模型。针对液压油驱动VCT系统液力、机械结构具有非线性特征及系统时变性等特点提出了模糊PID控制策略。在对PID控制的响应特性进行分析的基础上，应用模糊控制技术，提出并设计了模糊PID控制器，并利用MATLAB软件进行了仿真研究。仿真研究结果表明，模糊PID控制相对于PID控制来说有较好的执行性能，提出的控制算法具有结构简单、实时性好、响应快等优点，较好地满足了VCT控制要求。

Simulation of Variable Cam Timing Control System Based on Fuzzy-PID

A fuzzy-PID control system was applied to a hydraulically-operated continuous variable cam timing (VCT) now in the mainstream of variable valve actuation systems. Through analysis of the hy?draulic system, a VCT mathematical model was set up. Aiming at non-liner and time varying charac?teristics of the hydromechanical mechanism of the VCT system driven by hydraulic oil, we proposed fuzzy-PID control strategy. Based on the detailed analysis to response state of PID control, the fuzzy- PID controller was proposed and designed by the fuzzy control technology. A model was established and simulated by the MATLAB code with strong capabilities of engineering calculation and number analysis. The results of simulation indicate that the fuzzy-PID control has better actuating performance compared with PID control; the control algorithm is simple in structure, good in real time capability, fast in response and can preferably satisfy control request.