电液驱动可变气机构缓冲过程研究

电液驱动可变气门机构缓冲过程影响气门机构的冲击性能及气门运动的响应性能。基于AMESim仿真软件，设计了电液驱动可变气门系统，研究了节流阀节流面积和节流行程对气门运动缓冲过程的影响规律，并采用遗传算法对节流阀控制参数进行寻优，改善气门运动缓冲性能。结果表明，减小节流行程和增大节流面积可以提高气门运动的响应性能。通过遗传算法对控制参数进行寻优，在优化的控制参数下气门行程终了速度明显改善，气门开启至最大行程时速度降至0.11m/s，气门关闭落座速度降至0.07m/s，同时保证气门运动的响应性能。

Research on Buffering Process of Electro-hydraulic Variable Valve Train

The buffering of electro-hydraulic variable valve train might affect the impact properties and the response performance of the valve motions. Therefore, a electro-hydraulic variable valve train system was designed based on AMESim. Throttling area and throttling stroke of the throttle possessed effects on the buffering process of the valve motions. In addition, genetic algorithm was used to search for the optimization control parameters of throttle to improve buffering performance of the valve motions. It may be concluded that decreasing throttling stroke and increasing throttling area may improve the response performance of valve motions. The final speed of valve stroke may be greatly optimized by genetic algorithm, and may be reduced to 0.11m/s in valve opening process and 0.07m/s in valve closing process, as well as guarantee of the response performance of valve motions.