摘要
为降低天然气发动机起动阶段的HC排放,在一台6缸火花点火天然气发动机上进行了起动试验研究。控制起动阶段的喷射脉宽和点火提前角,采集起动后1min内的转速和排放数据。试验结果表明:在一定范围内,HC排放随喷射脉宽和点火提前角的增加而增加。为保证顺利起动并有较低的HC排放,起动初始阶段应采用较大的喷射脉宽和较大的点火提前角,而转速稳定后采用逐渐减小的喷射脉宽和点火提前角。
To reduce HC emissions of the CNG engine during starting period, starting experiments were carried out on a six-cylinder spark-ignited CNG engine. Data of engine speed and HC emissions at dif- ferent injection pulse widths and spark timing were collected within 60 s after starting. The results indicate that wider injection pulse width and earlier spark timing cause higher HC emissions. To guarantee reliable start and low HC emissions, the engine should be started with relatively wider injection pulse width and earlier spark timing, and when reaching stable speed, recovered smaller injection pulse width and spark advance angle.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2012年第3期10-13,19,共5页
Chinese Internal Combustion Engine Engineering
基金
汽车安全与节能国家重点实验室基金项目(zz2010-062)
