点火提前角对通用小型汽油机缸内燃烧及排放的影响

发布时间：2018-11-24 17:03

【摘要】：以168F汽油机为样机,由原机磁电机电感无触点式点火系统改装为开环电控点火系统,实现点火提前角的柔性控制,以美国环境保护署(EPA)第三阶段排放法规为目标,研究点火提前角对通用小型汽油机缸内燃烧及排放的影响。研究发现增大点火提前角,缸内最大燃烧压力和最高燃烧温度增大,其分别对应的曲轴转角均提前;燃烧循环波动先减小后增大,氮氧化合物(NOx)和碳氢化合物(HC)排放值均增大。依据美国EPA第三阶段排放法规的排放限值和试验方法,对电控汽油机不同工况的点火提前角进行了优化,保持原机标定功率值,以降低排放为主要目标,兼顾经济性和工作稳定性,形成了168F汽油机最优点火提前角脉谱图。试验结果表明应用该脉谱图后,整机综合性能优化,实现点火提前角的柔性控制,汽油机整机实测一氧化碳(CO)、HC、NOx排放分别下降了6.6%、11.2%、15.8%。
[Abstract]:Taking the 168F gasoline engine as a prototype, the original magneto motor inductance contactless ignition system was modified into an open loop electrically controlled ignition system, which realized the flexible control of ignition advance angle. The goal was the third stage emission regulation of (EPA) of the United States Environmental Protection Agency. The effect of ignition advance angle on combustion and emission in cylinder of a general purpose small gasoline engine was studied. It is found that the maximum combustion pressure and the maximum combustion temperature increase with the increase of ignition advance angle, and the corresponding crankshaft rotation angles advance. The fluctuation of combustion cycle decreases first and then increases, and the emission values of (NOx) and (HC) increase. According to the emission limit and test method of the third stage emission regulation of EPA in the United States, the ignition advance angle of electrically controlled gasoline engine under different working conditions is optimized to maintain the calibrated power value of the original engine and to reduce the emission as the main goal. Considering economy and working stability, the optimal ignition angle pulse spectrum diagram of 168F gasoline engine is obtained. The experimental results show that the overall performance of the whole engine is optimized and the flexible control of ignition advance angle is realized. The measured carbon monoxide (CO), HC,NOx) emission from the whole gasoline engine decreases by 6.6 ~ 11.2g / 15.8 respectively.
【作者单位】：江苏大学汽车与交通工程学院;
【基金】：江苏高校优势学科建设工程项目(苏证办发〔2014〕)
【分类号】：TK411

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