VVT与LPEGR对混合动力汽油机燃油经济性的影响  

Effects of VVT and Low-Pressure EGR on Fuel Economy of Hybrid Gasoline Engine

作　　者：张龙平 宫宝利[1,3] 黄德军 伍晨波[1] 刘永刚 胥昌懋[1] ZHANG Longping;GONG Baoli;HUANG Dejun;WU Chenbo;LIU Yonggang;XU Changmao(China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China;State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China;Key Laboratory of Traffic Safety on Track of Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中国汽车工程研究院股份有限公司,重庆401122 [2]重庆大学机械传动国家重点实验室,重庆400044 [3]中南大学轨道交通安全教育部重点实验室,湖南长沙410083

出　　处：《车用发动机》2022年第3期1-6,共6页Vehicle Engine

基　　金：国家重点研发计划重点专项(2017YFB0103500);重庆市技术预计与科技创新项目(cstc2021jsyj-ydxwtAX0007)。

摘　　要：为了应对日益严格的碳排放法规,充分挖掘VVT和LPEGR技术对混合动力汽油机在节能方面的潜力,试验研究了VVT和LPEGR技术对混合动力发动机燃油消耗率的影响。结果表明:在不加入LPEGR时,燃油消耗率随进气VVT增大、排气VVT减小而降低,最佳进/排气VVT组合是50°/0°;不同VVT组合下加入LPEGR,燃油消耗率都呈下降趋势,但下降幅度不同,最大下降7.4%,且呈现出随进气VVT的增大,降幅和最佳EGR率逐渐减小的趋势;另外,最佳EGR率下的燃油消耗率则随VVT的减小而降低,最佳进/排气VVT组合是10°/0°,对应的最佳EGR率为23.2%,燃油消耗率为205.5g/(k W·h),说明VVT和LPEGR技术对改善燃油经济性具有较大潜力且LPEGR技术的潜力更大。In order to meet the increasingly stringent carbon regulations and fully tap the potential of VVT and low-pressure EGR technology in energy saving for hybrid gasoline engine,the effects of VVT and low-pressure EGR technologies on fuel economy of hybrid engine were experimentally investigated.The results show that the specific fuel consumption of hybrid engine without low-pressure EGR decreases with the increase of intake VVT and the decrease of exhaust VVT and the optimal intake and exhaust VVT combination is 50°and 0°.The specific fuel consumptions all decline after introducing low-pressure EGR under different VVT combinations,but the decreases are different with the maximum decrease of 7.4%.And the decrease of specific fuel consumption and the optimal EGR rate gradually decrease with the increase of intake VVT.In addition,the specific fuel consumption decreases with the decrease of VVT at the optimal EGR rate.The optimal combination of inlet and exhaust VVT is 10°and 0°,the optimal EGR rate is 23.2%,and the corresponding sperific fuel consumption is 205.5 g/(kW·h),According to the above analysis,the VVT and low-pressure EGR technologies have a great potential for improving fuel economy and it is especially true for low-pressure EGR technology.

关 键 词：混动动力 汽油机 可变气门正时 废气再循环 燃油消耗率 

分 类 号：TK421.7[动力工程及工程热物理—动力机械及工程]