【摘要】 电磁气门驱动(Electromagnetic Valve Actuation,EVA)是一项可变气门技术,具有很大的潜在技术优势。目前EVA还没有得到实用化,主要难点是控制气门软着陆。EVA是一个非线性系统,气门落座速度控制通常采用的方法是在落座平衡点附近将EVA模型进行泰勒展开,然后使用比较成熟的线性方法控制。双电磁气门驱动EVA将采用精确线性化方法变换成一个全局的线性模型,然后使用LQR线性方法进行控制。其结果是:初始化平均落座速度为0.08 m/s,单次过渡过程平均速度为0.05 m/s。分析可能影响控制效果的诸因素,结果表明:双气门控制中进排气门子系统之间基本上没有干扰,选择合适的控制开始时间可以得到理想的落座速度,但系统参数和传感器测试信号的准确性对控制有较大的影响。更多还原

【Abstract】 EVA is a variable valve technology,which has a potential tendency.At present,EVA has not been practicalized yet,whose main difficulty is soft landing in valve control.The method to control valve crash speed normally used is Taylor expansion of EVA model close to break even point of crash,then a more grown linear method is used to control.The derived result is: the initialized average crash speed is 0.08 m/s.By analyzing some factors may effecting control efficient,the result shows that subsystem between intake and exhaust valves in dual valve control doesn’t interface and selecting proper time to control start can get ideal crash speed,but the veracity of system parameter and sensor testing signal have bigger effect on control.更多还原