HC吸附系统降低汽油车冷起动HC排放的研究

Study on Reduction of Cold Start HC Emission by HC Absorption System in Gasoline Car

为降低冷起动时HC排放,利用吸附剂的低温吸附、高温脱附特性制作HC吸附系统。该系统由吸附催化器、控制阀及真空管路等组成,其中吸附催化器包含吸附和催化两种载体。即通过真空调节吸附系统的阀体开闭,控制流入吸附载体的气体量以进行吸附,达到一定温度后进行脱附,由后部催化器将其转化。利用CFD模拟计算优化气流分布,并通过整车试验确定阀体开闭的最佳时间。试验结果表明,该系统可降低冷起动HC排放30%以上。

To reduce cold start HC emission, we make use of the low temperature adsorption and high temperature desorption performance of absorbent to produce HC absorption system. This system consists of an absorber catalytic converter, control valve, vacuum circuit and so on, the HC absorber includes adsorption material and substrate. Through adjust the vacuum adsorption system＇s valve opening and closing to control the amount of gas flowing into the adsorption substrate for absorption, which is then desorbed at certain temperature, and converted by the rear catalytic converter. CFD simulation is carried out to optimize the distribution of gas flow, and vehicle test is performed to determine the best time to open the valve. The test results show that the HC emission can be reduced by over 30% with this system.