CAJ | 학술논문

针对增压直喷汽油机的特点，进行了冷起动 HC排放影响因素的探讨，研究过程采用试验与仿真相结合的方法，基于发动机试验台测试数据，重点分析了冷起动过程中空燃比、点火策略、缸内残余废气、喷油策略对 HC排放的影响。分析结果表明：在发动机冷起动过程中，实现有效的稀燃和降低缸内残余废气有利于降低 HC排放；适当的喷油策略可降低 HC排放，但需要合理地组织发动机瞬态进气；发动机点火角提前有利于降低 HC排放，但需要考虑整车三元催化器暖起过程。
침대증압직분기유궤적특점，진행료랭기동 HC배방영향인소적탐토，연구과정채용시험여방진상결합적방법，기우발동궤시험태측시수거，중점분석료랭기동과정중공연비、점화책략、항내잔여폐기、분유책략대 HC배방적영향。분석결과표명：재발동궤랭기동과정중，실현유효적희연화강저항내잔여폐기유리우강저 HC배방；괄당적분유책략가강저 HC배방，단수요합리지조직발동궤순태진기；발동궤점화각제전유리우강저 HC배방，단수요고필정차삼원최화기난기과정。
For the characteristics of turbocharged GDI engine ,the influencing factors of HC emission during cold start was discussed through test and simulation .Based on the measured data from test bench ,the influences of air-fuel ratio ,ignition strategy ,in-cylinder residual gas and injection strategy on HC emission were mainly analyzed during cold start .The results showed that the effective lean burn and in-cylinder residual gas reduction during cold start were beneficial to the HC reduction . The appropriate fuel injection strategy could reduce HC emission ,but the reasonable adjustment of transient intake was neces-sary .The advance of ignition timing was also helpful to reduce HC emission ,but the warming-up of vehicle three way catalysts should be considered .