Design of CRH axle temperature alarm based on digital potentiometer

To solve the test problems of alarm module used for CRH axle temperature monitoring system of the CRRC Qingdao Sifang CO. LTD., this paper analyzed the limitations of traditional debugging method (heating the temperature sensor area with a hot-air gun): long time for heating up, low efficiency. This paper takes the digital potentiometer as the temperature compensation component. We can change the equivalent resistance of PT100 temperature sensor by setting the temperature parameters of system manually through the touch screen and MCU, to simulate the axel temperature rising. Therefore the performance of the new axle temperature monitoring system can be verified through action of the alarm and the emergency brake. The original physical heating mode is replaced by the non-destructive embedded method which completes the test of alarm function of the axle temperature monitoring system.