GDI发动机直接起动首循环着火和转动特性  

First-cycle ignition and rotation characteristics of GDI engine direct-start mode

作　　者：孙文旭[1] 洪伟[1] 王建军[2] 解方喜[1] 杨俊伟[3] 汤绪雯[3] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022 [2]保定长城内燃机制造有限公司,河北保定072650 [3]奇瑞汽车股份有限公司,安徽芜湖241009

出　　处：《吉林大学学报（工学版）》2015年第5期1443-1449,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51206059);'863'国家高技术研究发展计划项目(2012AA111702);中国博士后科学基金项目(2013M540250);吉林省青年科研基金项目(20140520128JH)

摘　　要：为了促进发动机直接起动模式的成功实现,在一台四缸GDI发动机上研究了不同主动因素和被动因素对发动机首循环着火和转动特性的影响,并分析了在不同被动因素下使首循环能够可靠着火的主动因素控制范围和获得较好转动特性所对应的主动因素优化选取。研究结果表明:合理控制点火正时和过量空气系数能使首循环同时获得较高的燃烧压力及燃烧一致性。不同冷却液温度、轨压和活塞初始位置等被动因素下,保证首循环可靠着火的点火正时和过量空气系数范围也存在一定的差异。并且,不同被动因素下需分别选取适当的点火正时和过量空气系数才能使首循环获得较高的转动速度,促进发动机直接起动模式的实现。To promote the realization of direct-start mode without using starter,the influences of active and passive factors on the first-cycle ignition and engine rotation characteristics were investigated on a four-cylinder GDI engine.Under different passive factors,the control ranges of the active factors,which assure the reliable first-cycle ignition,and optimized control making engine to gain higher speak speed are analyzed.Experimental results indicate that the reasonable control of ignition timing and excess air coefficient can obtain higher combustion pressure and consistency for the first-cycle.Under different passive factors including coolant temperature,initial piston position and fuel pressure in oil rail,certain differences exist in the ranges of ignition timing and excess air coefficient that assure the reliable first-cycle ignition.Meanwhile,the excess air coefficient and ignition timing should be selected separately to get better rotation characteristics and promote the realization of direct-start mode for different passive factors.

关 键 词：动力机械工程 缸内直喷汽油机 直接起动模式 首循环 着火和转动特性 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]