Research into Thermal Response Time Fault Diagnosis of Temperature Sensor in High-Speed EMU

High-speed EMU temperature sensors are used to detect important parameters such as temperature on the train. The thermal response time of the temperature sensor is the main factor affecting the temperature measurement. The failure of the thermal response time will lead to the failure or false positives of the vehicle temperature sensor, which will cause the speed limit and stop, which will seriously affect the railway operation order. This paper focuses on the thermal response time of the temperature sensor of the high-speed EMU and analyzes the dissection and simulation of the temperature sensor. The results show that the reason for the failure of the thermal response time is that the sensor probe into the air leads to the thermal resistance becomes larger, reduces the heat transfer speed, and finally makes the thermal response time longer. Finally, according to the diagnostic analysis, results put forward the corresponding measures.