Abstract:

The catalytic mechanism of electrically heated three way catalyst converter for HEV was analyzed and the control-oriented dynamic model of catalyst converter was created. Then, the operation of the vehicle was simulated. Some factors which can affect the catalytic converter's light-off time, such as electrically heated power capacity and location, were investigated systematically. The simulation was  accomlished in NEDC(new European driving cycle).Effects of electrically heated energy for the battery's state of charge, the vehicle's fuel
 comsumption and emissions were analyzed. Simulation results show that electrically heated source equipped in HEV can increase the light-off of catalytic converters effectively with tiny price of fuel consumption, improve the HC/CO catalytic efficiency during the period of cold start and depletion of battery can be avoided.

Key words: hybrid electric vehicle(HEV), three way catalyst(TWC), electrically heated, light off, cold start

摘要：

对混合动力汽车电加热型三元催化器冷起动阶段的催化过程进行了分析, 建立了适用于开发整车控制策略的三元催化器动力学模型。在此基础之上，通过对混合动力汽车运行工况的模拟，对影响三元催化器起燃的加热功率和位置等因素进行了研究，分析了电加热能量对电池荷电状态、整车油耗和排放的影响。结果表明, 混合动力汽车采用电加热方式不会造成电池过放电，能以微小的燃油消耗为代价，有效加快三元催化器起燃，提高冷起动阶段的HC/CO转化效率。

关键词: 混合动力汽车, 三元催化器；电加热；起燃时间；冷起动