汽车三元催化转化器（TWC）工作效率监控方法研究

【作者】 聂存庆；

【导师】 王生昌；

【作者基本信息】 长安大学 ， 载运工具运用工程， 2005， 硕士

【摘要】 随着汽车排放法规的日益严格,三元催化转化器的开发和应用已成为控制汽车排放污染物的根本途径。当前,电子燃油喷射加三元催化转化器闭环控制技术已经成为控制汽车排放的主要措施之一,但是随着三元催化转化器使用时间的不断延长,其净化效率不断地下降,因而,对三元催化转化器转化效率的实时监控也成为人们关注和研究的问题。本文将在整车模拟道路试验的基础上,研究采用催化器出入口温差来监控三元催化转化器转化效率的方法。本文在分析研究电控喷射汽车排放控制技术及三元催化转化器失效机理、工作效率监控技术的基础上,通过选定车型—福莱尔三元催化转化器进出口温度差在定负荷不同车速试验条件下的试验数据分析研究,得到反映三元催化转化器工作效率的必要信息,运用数理统计的方法得出进出口温差值和催化转化器转化效率的对应函数关系,并建立一个能用于监控在用车催化转化器工作效率的评价模型。本文研究成果对汽车排放的实时监控具有一定的实用价值和指导意义。更多还原

【Abstract】 Along with the automobile emissiong regulationg increasingly strict,the three-way catalytic converter development and applications have become the basic path that contolled automobile emissiong. Current, the electric-control fuel-injection and three-way catalyst converts that formed the shut wreath controlling technique already have become one of the main measures to control the automobile exhaust. But along with the three-way catalytic converter’s service time continuously prolonging, its efficiency of purge descent constantly, as a result.So how to actual time supervise the three-way catalytic converter has become a problem that people concerned and researched. On the foundation of the whole car imitating the road experiment, this paper investigate the method of viaing the inlet-outlet temperature difference of catalyst to monitor catalyst’s work efficiency. In this paper, based on the analysing the emissiong controlling technique of the electric-control fuel-injection vehicle and three-way catalyst converts’ expiration mechanism and work efficiency, we have done many experiments of catalyst’s inlet-outlet temperature difference character when the vehicle that we have already made selection the car type is set in stable state of different speed and load, then we analyse the record of the experiment, and get the necessary information of reflecting the three-way catalytic converter work efficiency.To use mathematics and statistics getts the function relation between the inlet-outlet temperature difference of catalyst and the three-way catalytic converter work efficiency,then build up an evaluation model that can be used for supervision the car catalyst work efficiency.The paper’s research achievement certainly is useful to the ctual time supervise of vehicle’s emissiong.更多还原