张锦三,孙竹青,李理光.乘用车后处理器贵金属配比对排放物转化效率的影响[J].内燃机工程,2026,47(1):151-157.
乘用车后处理器贵金属配比对排放物转化效率的影响
Effects of Platinum Group Metal Ratio of Aftertreatment System for Passenger Car on Emission Conversion Efficiencies
DOI：
关键词:乘用车  后处理器  贵金属配比  排放物  转化效率
Key Words:passenger car  after-treatment system  platinum group metal ratio  emission  conversion efficiency
基金项目:
作者单位E-mail
张锦三* 同济大学 汽车学院，上海 201804
优美科汽车催化剂（苏州）有限公司，苏州215000 		362450526@qq.com 
孙竹青 优美科汽车催化剂（苏州）有限公司，苏州215000 irina.sun@ap.umicore.com 
李理光* 同济大学 汽车学院，上海 201804 liguang@tongji.edu.cn 
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摘要:基于一辆搭载2.0 L 4缸增压直喷汽油机的插电式混合动力乘用车，针对国六b排放法规，通过试验设计（design of experiment， DOE）方法设计后处理器的贵金属配比，建立排放模型观测贵金属配比对后处理器转化效率的影响，并通过该模型对后处理成本及排放控制进行研究。结果表明：相较于传统方法设计贵金属配比，使用DOE方法可以大幅降低贵金属用量，降低后处理器成本，提高后处理器转化效率。紧耦合催化器（close-coupled catalyst， CCC）前区钯和铑浓度越高，一氧化碳（CO）和总碳氢化合物（total hydrocarbons， THC）转化效率越高。紧耦合催化器后区钯浓度、底盘催化器（under-floor catalyst， UFC）铂浓度及底盘催化器铑浓度均对CO和THC转化效率无显著影响。铑浓度越高，氮氧化物（NOx）转化效率越高。紧耦合催化器前区钯浓度、紧耦合催化器后区钯浓度、底盘催化器铂浓度和底盘催化器铑浓度均对NOx转化效率无显著影响。根据试验设计模型计算，该车型在满足排放法规国六b要求的前提下，后处理器贵金属成本较原车降低39%。
Abstract:Based on a plug-in hybrid passenger car equipped with a 2.0 L four-cylinder turbo-charged direct injection gasoline engine， catalysts’ platinum group metal（PGM） ratio matrix was designed using design of experiment（DOE） method to meet China 6b regulation. Vehicle emission model was built up to observe the PGM ratio influence on conversion efficiencies. Furthermore， aftertreatment converter cost and emission control were studied based on the model. The results show that compared with the traditional PGM ratio design method， the DOE method can significantly reduce the amount of PGM and the cost of aftertreatment system while improving the gaseous conversion efficiency. The higher the concentration of palladium （Pd） and rhodium （Rh） in the front zone of the close-coupled catalyst （CCC）， the higher the conversion efficiency of carbon monoxide （CO） and total hydrocarbons （THC）. Conversely， the Pd concentration in the rear zone of the CCC， the platinum （Pt） concentration in the under-floor catalyst （UFC）， and the Rh concentration in the UFC have no significant impact on CO and THC conversion efficiencies. Additionally， higher Rh concentration in the CCC improves nitrogen oxide （NOx） conversion efficiency， while the Pd concentration in the front and rear zones of the CCC， as well as the Pt and Rh concentrations in the UFC， show no significant influence on NOx conversion. According to calculations from the DOE model， the aftertreatment system’s PGM cost for the vehicle model can be reduced by 39% compared to that of the original configuration when meeting China 6b regulation.
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