摘要
针对发动机凸轮驱动式液压可变气门控制跟踪误差较大问题,设计了无凸轮发动机液压执行机构,并采用了复合控制系统。建立了混合执行器数学模型,分析了气门阀液压驱动工作原理。给出了压电致动器等效电路图和数学表达式,推导出气门阀液压驱动运动方程式。结合前馈控制和反馈控制的各自优点,设计了复合控制系统。采用MATLAB软件对发动机气门运动位移、压电位移和压力变化跟踪误差进行仿真,并且与反馈控制系统输出误差进行比较和分析。结果表明:与反馈控制系统相比,采用复合控制系统反应迅速,自适应调节能力较好。气门运动位移、压电位移和压力变化跟踪误差较小。因此,提高了气门运动轨迹跟踪精度,改善了发动机综合性能。
In view of the large tracking error of the engine cam driven hydraulic variable valve control,a cam less engine hydraulic actuator was designed and a composite control system was adopted.The mathematical model of the hybrid actuator was established,and the working principle of the valve hydraulic drive was analyzed.The equivalent circuit diagram and mathematical expression of the piezoelectric actuator were given,and the hydraulic driving motion equation of the valve was derived.Combined with the advantages of feedforward control and feedback control,a compound control system was designed.Matlab software was used to simulate the tracking error of valve movement displacement,piezoelectric displacement and pressure change.At the same time,it was compared and analyzed with the output error of feedback control system.The results show that compared with the feedback control system,the composite control system has a faster response and better adaptive regulation ability.The tracking errors of valve movement displacement,piezoelectric displacement and pressure change are small.Therefore,the tracking accuracy of valve trajectory is improved and the comprehensive performance of engine is improved.
作者
王德云
袁翔
WANG De-yun;YUAN Xiang(Electromechanical Department,Changde Vocational Technical College,Changde Hunan 415000,China;College of automobile and Mechanical Engineering,Changsha University of Science&Technology,Changsha 410000,China)
出处
《组合机床与自动化加工技术》
北大核心
2021年第1期131-134,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
湖南省教育厅科研资助项目(15C0179)。
