LPG电控喷射冷起动循环的着火及HC排放影响因素分析  

Key Factors Affecting Ignition and HC Emission During Cold-start in a LPG EFI Engine

作　　者：王振锁[1] 肖宗成[1] 王惠萍[1] 邓宝清[1] 李理光[2] 

机构地区：[1]吉林大学汽车工程学院,长春130025 [2]上海交通大学内燃机研究所,上海200030

出　　处：《汽车工程》2004年第2期157-161,共5页Automotive Engineering

基　　金：自然基金资助 (5 0 376 0 34);清洁汽车行动项目 (2 0 0 3BA4 0 8B0 9A);国家教育部青年骨干教师基金资助

摘　　要：分析了电喷LPG发动机冷起动过程中影响着火及HC排放的主要因素。试验在一台四冲程、水冷1 2 5mL单缸电喷发动机上进行。试验结果表明 :LPG发动机冷起动混合气的浓度相当于稳定燃烧混合气浓度的1 5倍左右 ,比汽油机稀 ,HC排放也低 ;随着混合气变稀 ,首次着火循环逐渐推迟 ;高起动转速是发动机冷起动可靠的一个主要保障因素 ;适当提前点火和增大火花塞间隙有利于降低冷起动循环的首次着火循环数 ;In this paper,key factors affecting ignition and HC emission during cold start in a LPG EFI engine are analyzed based on the test on a four stroke,water cooled,125mL single cylinder SI engine with EFI system Test results show that the LPG mixture in cold start is 1 5 times as rich as that in normal running,but is still leaner than that of gasoline engine,so HC emission of LPG engine at start condition is lower than that of gasoline engine The first firing cycle is postponed when the mixture becomes lean High cranking speed for cold starting is a main factor to ensure the successful firing and combustion The proper advanced spark timing and wider spark gap are helpful in improving cold starting And the ambient temperature is also an important factor for cold starting

关 键 词：电喷LPG发动机 冷起动 着火 HC排放 车用发动机 排放控制 

分 类 号：U464[机械工程—车辆工程]