全可变气门机构中的液压压力波动现象  

Hydraulic Pressure Fluctuation in Fully Variable Valve Train

作　　者：谢宗法[1,2] 秦磊[1] 王志明[2] 刘永田[3] 陈俭[1] 

机构地区：[1]山东大学机械工程学院,山东济南250061 [2]山东大学能源与动力工程学院,山东济南250061 [3]山东建筑大学机电工程学院,山东济南250101

出　　处：《内燃机学报》2011年第5期455-460,共6页Transactions of Csice

基　　金：汽车安全与节能国家重点实验室开放基金资助项目(KF10072);山东省自然科学基金资助项目(ZR2009FM040)

摘　　要：液压压力波动决定了全可变液压气门机构的最高允许转速.当发动机转速达到或超过该最高允许转速时,液压系统内压力波动将加剧,最低压力波谷值将会达到或低于低压系统的压力值.在此情况下,液压油将不能及时得到排泄,气门运动规律已失去有效控制,气门机构对进气量也失去调节作用.通过研究发现,降低气门机构运动件质量,提高液压气门机构的刚度,减小液压系统内的节流作用,合理设计配气凸轮型线,能够有效降低气门机构中液压压力波动.试验结果表明,经过改进设计后,全可变液压气门机构中的压力波动明显降低,最高允许转速已达5,600,r/min.The maximum permissible speed of the fully variable valve train is determined by the pressure fluctuation of hydraulic system. When the maximum permissible speed reaches or exceeds, the pressure fluctuation of hydraulic system will be intensified and minimum value of pressure decrease to below the pressure in low-pressure system. In this case, the hydraulic liquid can not drain in time, the characteris- tics of valve movement will be out of control, and the intake air volume can not be regulated by the fully variable valve train. The pressure fluctuation of fully variable valve train can be improved by decreasing the mass of moving parts in valve train, increasing the stiffness of valve train, reducing the choking effect in the hydraulic system, and rationally designing the valve cam profile. Experimental results show that the pressure fluctuation of hydraulic system decreases obviously in the newly designed train, and the fully variable hydraulic valve train can operate steadily and reliably up to 5 600 r/min.

关 键 词：全可变气门机构 液压压力波动 压力测量 最高允许转速 

分 类 号：TK413.4[动力工程及工程热物理—动力机械及工程]