点燃式LPG发动机暖机过程的排放特性与优化控制研究(英文)  

Emission Characteristics and Optimizing Control during Warm-up in an LPG SI Engine

作　　者：刘志敏[1] 李理光[2] 邓宝清[3] 

机构地区：[1]上海交通大学内燃机研究所,上海200030 [2]同济大学汽车学院,上海201804 [3]吉林大学内燃机系,吉林长春130025

出　　处：《内燃机学报》2006年第3期206-214,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(50376034)。

摘　　要：介绍了冷起动暖机过程中HC和CO排放特性及其控制策略的研究。试验在一台单缸四行程125 mLLPG电控喷射点燃式发动机上进行。通过对三效催化器前后HC和CO浓度的测量,计算出相应排放的转换效率。基于点火提前角的调整控制,使怠速转速控制在±25 r/min。研究了不同怠速转速和节气门开启角度对总排放和转化效率的影响,结果发现,本试验样机暖机阶段排放最优控制的怠速转速为1 500 r/min,节气门开启角度是11.5°。The characteristics of HC and CO emissions during warm-up and their controlling strategies were experimentally investigated in a 125 cm^3 single-cylinder LPG spark ignition engine. Measurements on HC and CO emissions before and after Three-Way-Catalytic converter （TWC） were conducted. The total emissions after the TWC and the conversion efficiency of TWC were calculated. The fluctuation of the idling speed was controlled within ±25 r/min through adjusting the ignition advance angle. The effects of different idling speeds and throttle openings on the total emissions and TWC conversion efficiency were obtained. The study showed that the optimal idling speed was 1 500 r/ min and the optimal throttle opening was 11.5° for achieving the lowest emissions during warm-up.

关 键 词：暖机 LPG 怠速转速 节气门开度 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程] U464.174[机械工程—车辆工程]