动态气门运行特性及二冲程制动性能耦合研究  

Study on Coupling Relationship Between Dynamic Valve OperatingCharacteristics and Two-Stroke Braking Performance

作　　者：崔靖晨[1] 魏磊 郝彩红 董鹏博[1] Cui Jingchen;Wei Lei;Hao Caihong;Dong Pengbo(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Future Technology,Weichai Power Company Limited,Weifang 261061,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]潍柴动力股份有限公司未来技术研究院,山东潍坊261061

出　　处：《内燃机学报》2024年第1期70-77,共8页Transactions of Csice

基　　金：校企合作资助项目(2019-187)。

摘　　要：基于自主研发的变模式气门驱动装置,进行发动机和该气门驱动装置联合仿真,研究了二者的强耦合运行特性,为该装置的装机应用提供理论依据.研究结果表明:缸内压力和气门运行之间的强耦合关系在上止点附近排气门运行阶段尤为明显,尤其是在2300 r/min以下,发动机转速越高,气门动态升程损失程度越大,最大缸内压力越高;高于该转速后,二者变化程度逐渐减小;排气制动凸轮在上止点后设置过渡升程可消除排气门反跳的问题,并且可进一步改善制动功率和最大缸内压力之间的矛盾关系;与理想四冲程制动相比,二冲程制动的制动功率明显增加,最大缸内压力明显降低,发动机转速分别为1600、1900和2400 r/min时,实际二冲程制动功率分别提高了35.94%、45.61%和27.54%,最大缸内压力分别降低了45.42%、27.20%和7.35%.Based on the self-developed variable-mode valve actuation system,a combined simulation of the valve actuation system and the engine used was carried out to study their coupling operation characteristics,which provides a theoretical proof for vehicle application.The results show that there is a strong coupling relationship between the in-cylinder pressure and the valve operation,especially in the exhaust valve operation stage near top dead center(TDC)and below the engine speed of 2300 r/min.The higher the engine speed is,the greater the valve dynamic lift loses,and the higher the maximum cylinder pressure is.While their change degree is gradually reduced at engine speed over 2300 r/min.Adding a transitional lift on the exhaust brake cam after TDC can eliminate the exhaust valve recoil,and further improve contradiction relationship between the braking power and the maximum in-cylinder pressure.Compared with the ideal four-stroke brake,braking power of the two-stroke brake is obviously increased,and the maximum in-cylinder pressure is obviously reduced.The actual two-stroke braking power is increased by 35.94%,45.61%and 27.54%,and the maximum in-cylinder pressure decreased by 45.42%,27.20%and 7.35%at 1600,1900 and 2400 r/min,respectively.

关 键 词：发动机 二冲程制动 变模式气门驱动装置 联合仿真 

分 类 号：U464.134.3[机械工程—车辆工程]