高压缩比米勒循环发动机设计与分析  

Design and Analysis of A Miller-Cycle Engine with High Compression Ratio

作　　者：徐玉梁[1] 赵广兴 祖炳锋[1] 王振[1] 刘丽娜 Xu Yuliang;Zhao Guangxing;Zu Bingfeng;Wang Zhen;Liu Lina(Internal Combustion Engine Research Institute,Tianjin University,Tianjin 300072)

机构地区：[1]天津大学内燃机研究所,天津300072

出　　处：《汽车技术》2018年第9期46-50,共5页Automobile Technology

基　　金：国家自然科学基金重点项目(50976076)

摘　　要：为提高发动机的热效率,提出了高压缩比结合米勒循环的解决方案。在某2.0 L自然吸气发动机的基础上,通过增加发动机活塞顶凸台的方法实现了压缩比从10到13的提高,并采用遗传算法对凸轮型线进行了选型,通过进气门晚关(LIVC)方式实现了米勒循环。试验结果表明,与原发动机相比,高压缩比米勒循环发动机最低燃油消耗率下降10.4 g/(k W?h),低油耗范围明显扩大,且主要是向低转速小负荷的方向扩展。To improve the engine’s thermal efficiency,a solution of high-compression ratio combined with Miller cycle was presented in this paper.Compression ratio was increased from 10 to 13 by the means of raising piston crown boss on a 2.0 L naturally aspirated gasoline engine.Then a cam profile was chosen with the method of genetic algorithm,and Miller cycle was achieved by Late Intake Valve Closing(LIVC).Experiment results show that minimum fuel consumption of the Miller cycle engine decreases by 10.4 g/(kW?h)compared with the original engine and the low-fuel consumption region expands obviously and moves toward low-load and low-speed area.

关 键 词：发动机 米勒循环 高压缩比 燃油经济性 

分 类 号：U464.9[机械工程—车辆工程]