点火提前角对通用小型汽油机缸内燃烧及排放的影响  

Effects of Ignition Advance Angle on Combustion and Emissions of Small Non-Road Spark Ignition Engine

作　　者：刘胜吉[1] 曾瑾瑾 李崇尚 韩维维[1] 王建[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《内燃机工程》2016年第5期109-114,共6页Chinese Internal Combustion Engine Engineering

基　　金：江苏高校优势学科建设工程项目(苏证办发〔2014〕)

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%。A small non-road SI engine of 168F was taken as a base engine and its contactless ignition system of magneto inductive energy storage was modified into an open loop electronic ignition system to realize a flexible control of ignition advance angle. Simultaneously, taking U.S. environmental protection agency（EPA） phase Ⅲ emissions regulation as a target, a research on the effect of ignition advance angle on combustion and emissions of small non-road SI engines was carried out. The study has showed that increase of ignition advance angle would result in increases of the maximum combustion pressure and the maximum combustion temperature in cylinder, and decreases of their corresponding crank angles; that combustion cycle fluctuation first increases then decreases, and HC and NOx emissions increase. According to the limits of U.S. EPA phase Ⅲ emissions regulation and test method, the ignition advance angles under different working conditions were optimized to reduce emissions while keeping the original rated power as well as balancing fuel economy and working stability. The optimized ignition advance angle MAP of the 168F gasoline engine was thus developed and verified by a bench test. The results show that when the 168F gasoline engine is equipped with this new electronic ignition system, its comprehensive performance is optimized and the flexible control of ignition advance angle is realized. Besides, CO emission goes down by 6.6%, HC emission comes to a drop of 11.2% and NOx decreases by 15.8%.

关 键 词：内燃机 汽油机 电控 点火系统 点火提前角 排放 性能 

分 类 号：TK417.1[动力工程及工程热物理—动力机械及工程]