胡军义1，段伟2

 1.泛亚汽车技术中心有限公司，上海201210；2.安徽水利水电职业技术学院，安徽合肥230071

 摘要：根据排气通过汽油机颗粒捕集器（gasoline particulate filter，GPF）后温度发生变化的特性，设计一种基于GPF前、后端温差的GPF载体缺失诊断方案。在GPF的前端与后端各安装一个排气温度传感器，通过试验数据统计与分析，选取适当的诊断工况，通过比较诊断工况中2个位置的排气温度差异来判断GPF载体是否存在缺失故障。在实际道路上进一步验证诊断方案和故障限值，结果表明该诊断方案可以准确区分GPF载体正常件和载体缺失件。

 关键词：温度传感器；汽油机颗粒捕捉器；诊断方案

 Abstract：According to the characteristics of exhaust temperature changing after passing through the gasoline particulate filter (GPF), a GPF subtract missing diagnosis scheme based on the temperature difference between the front and back end of GPF is designed. Two exhaust temperature sensors are installed at the front end and the back end of the GPF respectively. Through the statistics and analysis of the test data, the appropriate diagnosis condition is selected, and the exhaust temperature difference between the two positions in this condition is compared to judge whether the GPF carrier is missing. The results show that the diagnosis scheme can accurately distinguish the normal parts and the missing parts.

 Keywords:temperature sensor;GPF;diagnostic strategy