作　　者： ; ; ; ; ; ;

机构地区： 吉林大学汽车工程学院

出　　处： 《燃烧科学与技术》 2008年第3期216-220,共5页

摘　　要： 基于循环控制策略,在一台125 mL单缸四行程电控喷射点燃式发动机上,分别燃用汽油、LPG和甲醇3种燃料进行了冷起动瞬态工况着火特性的试验研究.在只喷射一次燃料的情况下,确保汽油、LPG和甲醇发动机可靠起动时,研究循环喷射量和环境温度的影响.试验结果表明,循环喷射量对汽油和LPG发动机可靠起动影响显著,合适的循环喷射量即可保证汽油和LPG发动机可靠起动;环境温度对甲醇发动机可靠起动影响最显著,循环喷射量次之,环境温度低于16℃时,不采取辅助起动措施,低喷射压力下喷多少燃料都不能使甲醇发动机起动;同一喷射时刻,汽油和LPG发动机可实现"即喷即着"的理想着火,甲醇发动机要比汽油和LPG发动机晚一个循环着火. The transient firing behavior of a spark-ignition engine fueled with gasoline, liquid petroleum gas （LPG） and methanol respectively during cold start was investigated experimentally by means of cycle-by-cycle control strategy on a 125 mL-single-cylinder four-stroke electronically controlled fuel injection engine. The amount of fuel injected per cycle and the ambient temperature for assuring gasoline, LPG and methanol engine reliable start were investigated experimentally based on the single cycle fuel injection. The results show that the amount of fuel injected per cycle significantly affects gasoline and LPG engine cold start reliability. A proprer amount of fuel injected per cycle can ensure a reliable start of gasoline and LPG engine. The ambient temperature affects methanol engine reliable cold start the most significantly, and the amount of methanol injected per cycle takes the second place. When the ambient temperature is below 16 ℃, the methanol engine cannot be started reliably without auxiliary start-aids even with the large amount of methanol injected per cycle under low injection pressure. At the same injection timing, gasoline and LPG engine may realize the ideal firing of next cycle combustion after fuel injection, and the firing of methanol engine is one cycle later than that of gasoline and LPG engine.

关 键 词： 点燃式发动机 燃料 冷起动 循环控制 着火特性

领　　域： [动力工程及工程热物理]