满足欧Ⅱ及欧Ⅲ排放法规的车用汽油机冷起动排放控制技术

Cold Starting HC Emission Control Technology for Vehicular Gasoline Engines to Meet EuroⅡand EuroⅢEmission Regulations

配有三效催化器的汽油机,排气中的HC排放物70%～80%是在冷起动阶段产生的。从冷起动阶段HC产生的主要原因入手,分析了空燃比、点火提前角对HC的影响,提出了现今国内外为满足欧Ⅱ及欧Ⅲ排放法规、减少冷起动阶段HC排放所采取的机内措施和排气后处理技术,并对不同排气后处理技术装置进行了对比。

percent of HC emissions of gasoline engines with the three-way catalyst converter is produced.during cold starting phase.Starting from the primary reasons of HC emissions during cold starting phase,effects of air fuel ratio and ignition advance angle are analyzed,and out-of-engine measures and post-processing technologies to meet re-quirements of EUROⅡand EUROⅢemission regulations and to reduce HC emissions during cold starting phase inside and outside of China,and different exhaust post-processing technology equipments are compared.