单缸EGR发动机压缩比优化及涡轮增压器匹配研究  

Compression Ratio Optimization and Turbocharger Matching for Single Cylinder EGR Engine

作　　者：马兴兴[1,2] 马志刚 于书海[1,2] 孙剑 乔静波[1,2] 崔亚彬 宋东先[1,2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心,河北保定071000

出　　处：《车用发动机》2017年第4期59-62,67,共5页Vehicle Engine

摘　　要：在1台气道喷射单缸EGR发动机上,独立控制EGR缸喷油及点火,实现燃料改质,研究了不同压缩比对发动机性能的影响,此外还匹配了不同涡轮增压器,用于改善外特性扭矩。试验结果表明:单缸EGR能有效改善发动机的燃油经济性,NOx和CO排放性能均所改善,但THC排放恶化,动力性能下降;提高压缩比能有效提高发动机的热效率,降低燃油消耗,但过高压缩比使发动机爆震倾向严重,限制发动机外特性扭矩;通过匹配小涡轮增压器低速扭矩有所改善。The effects of different compression ratios on engine performance were investigated on a single cylinder EGR engine by controlling the injection and ignition separately.Different turbochargers were matched to improve the full torque of each speed.The results show that the single cylinder EGR improves the fuel economy and NOx and CO emissions,but leads to the deterioration of THC emission and total power.Higher compression ratio can improve the engine thermal efficiency efficiently and reduce the fuel consumption,but too high compression ratio will increase the probability of engine knock and limit the torque of external characteristic.In the end,the torque at low speed improves by designing the turbocharger with a small turbine.

关 键 词：汽油机 废气再循环 压缩比 热效率 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]