【摘要】 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。更多还原

【Abstract】 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 hydraulic system,a VCT mathematical model was set up.Aiming at non-liner and time varying characteristics 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.更多还原