排温传感器在天然气发动机上的失效模式分析

Failure Mode Analysis of Exhaust Temperature Sensor on Natural Gas Engine

针对国六天然气发动机在整车道路试验中排温传感器易损坏的问题进行了分析研究,认为其原因是整车试验工况超出了排温传感器规格书给定的使用范围,导致排温传感器寿命大幅降低。通过台架试验进行故障复现,发现制动时确实存在排温传感器温升/温降过快的情况。因此,对排温传感器的安装位置进行了调整,从而规避了排温传感器大规模失效的风险。

Aiming at the problem that the exhaust temperature sensor is easy to be damaged in the road test of the national six natural gas engine,after coordinating with the manufacturer for analysis and research,It is considered that the working conditions during vehicle test exceed the service conditions given in the exhaust temperature sensor specification.As a result,the service life of the exhaust temperature sensor is greatly reduced.The R&D personnel reproduce the fault through bench test,during braking,the temperature rise/fall of exhaust temperature sensor is too fast.Therefore,the installation position of the exhaust temperature sensor needs to be adjusted to avoid large-scale failure.