烃类添加剂改善M100甲醇发动机冷起动的试验研究

Experimental Investigation on Improving Cold Start of M100 Methanol Engine with Hydrocarbon Addition

针对M100甲醇发动机在低温环境下起动困难的问题,在M100甲醇中添加烃类添加剂,改善甲醇发动机的低温起动性能。按体积比在M100甲醇中分别添加15%汽油、8.5%异戊烷、10%石油醚作为添加剂,采用试验的方法测量了-20℃,-10℃,0℃三种环境温度下,甲醇发动机的起动性能。结果表明:甲醇中添加15%的汽油、8.5%的异戊烷、10%的石油醚,-20℃时M100甲醇发动机可以正常起动,起动时间小于3.5s,在-10℃时起动时间小于2.5s,在0℃时起动时间小于1.5s;环境温度为-10℃时,增大首循环喷射脉宽有利于缩短起动时间,首循环喷射脉宽从110ms增大到130 ms,添加上述比例添加剂后,M100甲醇发动机的起动时间分别缩短0.2s,0.2s,0.05s。

For the difficult start problems of M100 methanol engine at low temperature ,methanol was mixed with hydrocar-bon additive .With the prepared methanol blended fuel mixed with 15% gasoline ,8 .5% isopentane and 10% petroleum ether , the cold start performance of methanol engine at -20 ℃ ,-10 ℃ ,0 ℃ was studied respectively .The results show that metha-nol engine fueled with blended fuel can start within 3 .5 s ,2 .5 s and 1 .5 s in turn at three different temperatures .At -10 ℃ , increased initial injection width is helpful to accelerate the start process and the start time can shorten by 0 .2 s ,0 .2 s and 0 .05 s respectively when the initial injection width increases from 110 ms to 130 ms .