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1 二次空气喷射系统及其极修1.1 二次空气喷射系统的构成与工作由于车辆在冷起动阶段混合气较浓,因而排气中未燃烧的碳氢化合物的比例较高,通过二次空气喷射系统可以使三效催化转化器提前达到工作状态,从而改善三效催化转化器内的氧化过程(二次氧化)并减少排气中的有害物质。二次氧化所产生的热量还可大大缩短三效催化转化器的起作用时间,从而大大改善冷起动阶段的排放净化性能。一汽奥迪A6轿车二次空气喷射系统的构成如图1所示。
1 secondary air injection system and its supernatural 1.1 secondary air injection system composition and work As the vehicle during the cold start stage of the mixture is thick, so the proportion of unburned hydrocarbons in the exhaust gas is high, through the secondary air The injection system allows the three-way catalytic converter to reach its working state ahead of schedule, thereby improving the oxidation process (secondary oxidation) and reducing harmful substances in the exhaust gas in the three-way catalytic converter. The heat generated by the secondary oxidation can also greatly shorten the working time of the three-way catalytic converter, thus greatly improving the emission purification performance during the cold start phase. FAW Audi A6 sedan secondary air injection system configuration shown in Figure 1.