小型LPG发动机匹配三效催化器的起燃特性研究  

Study on Light-off Characteristics of a Small LPG Engine with Three-Way Catalyst

作　　者：李棠[1] 李理光[2] 刘志敏[3] 

机构地区：[1]上海大众汽车有限公司,上海201805 [2]同济大学汽车学院,上海201804 [3]上海交通大学机械与动力工程学院,上海200030

出　　处：《内燃机学报》2006年第3期256-262,共7页Transactions of Csice

基　　金：国家"十五"科技攻关资助项目(2003BA408B09A);国家自然科学基金资助项目(50376034)

摘　　要：对小型点燃式电控LPG发动机匹配三效催化器的冷起动过程进行了试验研究,测量了冷起动过程排气管不同位置的排温变化,对比了催化器不同安装位置、不同点火提前角下的起燃特性。通过优化催化器安装位置,调整发动机起动后的怠速转速和点火提前角来改变排气温度,从而使催化器快速起燃,降低了冷起动过程HC和CO的排放。The light-off characteristics of a small LPG engine with three-way catalyst were investigated. The temperature variations at different exhaust pipe positions were measured. The light-off characteristics at different installed positions of TWC and different ignition timings were compared. Through optimizing the installing position, adjusting idling speed and ignition timing to change the exhaust gas temperature, which then shortens the light off time of TWC, realizing reduction in HC and CO emissions during cold start and engine warming-up.

关 键 词：液化石油气 小型点燃式发动机 三效催化器 快速起燃 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]