摘要
汽油发动机具有非线性、时变时滞等特点,传统的增益可调PID方法很难保证发动机整个工作范围内转速控制的稳定性及性能要求。笔者采用模糊PID控制,来实现小型汽油发动机的恒转速控制。在不同转速/负载点,采用时域阶跃响应方法,建立了一组线性模型来表示发动机的非线性特性。基于建立的发动机模型,给出了模糊规则和推理来在线调整PID参数。发动机台架实验结果表明,所设计的控制器在负载扰动、工况变化和可变时间延迟的情况下都能保持期望的参考转速,满足小型无人直升机对发动机的控制要求。
Classical gain-scheduled PID speed regulation method provides no guarantee for closed-loop system stability or performances for the full operating range of an engine due to the existence of nonlinear behavior,time varying dead time.In this paper,a fuzzy gain scheduled PID speed controller is designed and evaluated for a mini gasoline engine.A set of linear models are developed from step responses at various engine speeds and torque loads to represent the nonlinear behavior of the engine.Based on these mathematical models,fuzzy rule and fuzzy inference are presented to adjust the PID parameters.The proposed control system is implemented in an engine ground tester.It is proved that the designed controller can provide reference speed tracking despite the presence of torque load disturbances,operating condition changes and variable time delays,and can meet the performance requirements for the unmanned helicopter engine.
出处
《机械科学与技术》
CSCD
北大核心
2011年第2期195-199,共5页
Mechanical Science and Technology for Aerospace Engineering
