排气再循环与燃烧边界条件耦合对增压汽油机有效热效率的影响  

Effect of Exhaust Gas Recirculation with Combustion Boundary Conditions on Thermal Efficiency of Turbocharged Port Fuel Injection Gasoline Engine

作　　者：胡鹏[1,2] 王伟[1] 邓康耀[2] 王孟轲[1] 

机构地区：[1]奇瑞汽车股份有限公司前瞻院/发动机工程研究院,安徽芜湖241009 [2]上海交通大学机械与动力学院,上海200240

出　　处：《西安交通大学学报》2016年第1期34-40,共7页Journal of Xi'an Jiaotong University

基　　金：国家高技术研究发展计划资助项目(2012AA11171)

摘　　要：在一台小型增压进气道喷射汽油机上开展了排气再循环技术与关键燃烧边界协同性对发动机燃油经济性和燃烧循环波动影响的试验研究。结果表明：增压技术、排气再循环技术和压缩比协同控制较为重要,协同性明显影响燃油经济性和燃烧循环波动;转速为2 000r/min、负荷为0.2~0.4 MPa时排气再循环对燃油经济性改善不明显;转速为1 500~2 500r/min、负荷为0.6~1.0MPa时排气再循环率对汽油机燃油经济性改善明显,燃油消耗率降幅为2%~7%;考虑高能点火系统本身能耗,转速为2 000r/min、负荷为0.2~1.0MPa时多重火花电容放电的高能点火系统对燃油经济性改善不明显,但循环波动得到了改善;对于上市整车匹配1.6L进气道喷射汽油机,采取集增压技术、排气再循环技术、高滚流进气道和1.3L排量措施后的进气道喷射汽油机的整车循环油耗降低了8.86%,整车具备达到相应油耗水平的潜力。The influence of exhaust gas recirculation coupled with various combustion boundary conditions on brake specific fuel consumption and cyclic variations of indicated mean effective pressure is investigated in a 1.3Lturbocharged port fuel injection gasoline engine.Results show that it is important to make supercharging technology,exhaust gas recirculation and high compression ratio control harmoniously,which favors to both brake specific fuel consumption and cyclic variations.Introducing exhaust gas recirculation into gasoline engine can improve the brake specific fuel consumption under medium and high loads（including wide open throttle operation）at 1 500-2 500r/min,however,it has little improvement on brake specific fuel consumption under the loads of 0.2-0.6 MPa BMEP（brake mean effective pressure）and engine speed of2 000r/min.Considering the high energy consumption of the capacitor discharge high-energy ignition system,introducing exhaust gas recirculation into gasoline engine does not effectivelyimprove brake specific fuel consumption but improve cyclic variations under the loads of 0.2-1.0MPa BMEP and engine speed of at 2 000r/min.Fuel consumption per 100 km for the vehicle equipped with the turbocharged gasoline engine coupled with supercharging,exhaust gas recirculation,high tumble inlet ports and 1.3Ldisplacement is estimated 8.86% under NEDC（new European driving cycle）condition,which is lower than that equipped with 1.6 L displacement naturally aspirated engine.

关 键 词：进气道喷射汽油机 排气再循环 燃烧边界 燃油消耗率 燃烧循环波动 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]