混合动力系统用发动机冷起动排放.pdf

44 10 上 海 交 通 大 学 学 报 V ol. 44 N o. 10 20 10 10 J OU RN AL O F SH AN GH A I J IA OT O N G U N IV ERSIT Y O ct . 20 10 : 100624 67( 2010 王存磊, 殷承良, 于海生 ( , 200240 : 通过分析发动机起动点火喷油及进气量控 策略, 确定了发动机冷起动过程中影响 H C 和N Ox 排放的关键参数为: 拖转转速起始喷油转速和点火推迟. 研究表明: 较高的拖转转速可以 减少发动机起动所需的燃油量改善燃油雾化质量促进完全燃烧降低H C 排放; 而过高的拖转转 速则会恶化N Ox 排放; 推迟点火可以有效地加速催化器起燃显著地降低排放, 若点火太迟只能有 限加速催化器起燃, 而且会增加油耗使燃烧不稳定增加失火, H C 及N Ox 排放同时恶化. 通过研 究排放规律, 选定了合适的冷起动参数, 为今后精确排放标定奠定了基础. : 混合动力系统; 发动机; 冷起动; 排放; 标定 : T K 421 : A Hybrid Engine Cold Start Emissions WA N G Cunl ei , YI N Che ng li ang , Y U H aisheng ( N at ional Engineering L aborat ory fo r A ut omo tive Elect ronics Cont ro l T echno logy , Shang hai Jiaot ong U niv ersity , Shang hai 200240, China Abstract: T he key parameters influencing cold start H C and N Ox emissions, including mot oring speed, fuelo n speed and ig nit ion ret ard, w er e analy zed by st udying eng ine st ar t ignit ion, f uel delivery and air charging st rat eg ies . T he r esult s show that hig her mot or ing speed help s to reduce start f uel, improves fuel at om ization and completes com bu st ion , and t hus reducing t he H C emission . But t oo hig h a m ot oring speed w il l det eriorate N Ox em ission . Ig nit ion r et ard can accelerat e T W C lighto ff ef fect ively, but t o o m uch of it w il l cau se unst able com bu st ion and misf ire, and det erio rat e H C and N Ox emissions sim ult aneou sly. By st udying the law of st ar t em ission , t he opt imized paramet ers w er e select ed , laying a f oundat ion