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首页> 外文会议>Advanced hybrid vehicle powertrains, 2009 >Characteristics of Three-way Catalyst during Quickly Start-up Process in a PFI Engine for HEV Application
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Characteristics of Three-way Catalyst during Quickly Start-up Process in a PFI Engine for HEV Application

机译：HEV PFI发动机快速启动过程中三效催化剂的特性

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摘要

The characteristics of three-way-catalyst during engine start process were investigated based on a simulated start/stop test system for HEV application. Although the catalyst has already reached its light-off temperature, the conversion efficiency is poor during engine start process due to the deviation of lambda from stoichiometric. The high concentration hydrocarbon emission spike can be stored by catalyst substrate temporarily, then it is released. This dynamic process decreases the conversion efficiency for the following exhaust hydrocarbon emission. When the initial temperature of catalyst substrate before engine start increased from 150℃ to 400℃, the conversion efficiency for both the hydrocarbon and NO are increased. For the engine investigated in this study, in order to convert the hydrocarbon efficiently (conversion efficiency >50%) from the beginning of engine start, the catalyst substrate temperature should be maintained at least at 350℃, as well as the lambda should be controlled at its optimal range throughout the start transient process.
机译：基于用于混合动力汽车的模拟起停测试系统，研究了发动机启动过程中三效催化剂的特性。尽管催化剂已经达到其起燃温度，但是由于λ与化学计量的偏差，因此在发动机启动过程中转化效率很低。高浓度碳氢化合物排放峰值可以由催化剂底物暂时存储，然后释放。该动态过程降低了后续废气排放的转化效率。当发动机启动之前催化剂底物的初始温度从150℃升高到400℃时，碳氢化合物和NO的转化效率都会提高。对于本研究中所研究的发动机，为了从发动机启动之初就有效地转化碳氢化合物（转化效率> 50％），催化剂底物温度应至少保持在350℃，并且应控制lambda。在整个瞬态过程中始终处于最佳范围。

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