Locomotive temperature sensor fault diagnosis and fault tolerance estimation method

Abstract

The invention discloses a locomotive temperature sensor fault diagnosis and fault tolerance estimation method comprising the following steps: (1) pre-establishing the corresponding relationship between fault conditions and measured temperature values and a relation model between the measured temperature value and true temperature value under each fault condition; (2) acquiring the current measured temperature value in real time when a locomotive is running, judging whether the current measured temperature value is an effective detection value, diagnosing that a temperature sensor is in a normal state and outputting the current measured temperature value as a true temperature value if the current measured temperature value is an effective detection value, or diagnosing that the temperature sensor is in a faulty state and going to step (3); and (3) positioning the fault condition corresponding to the current measured temperature value according to the corresponding relationship, and reconstructing or estimating the current true temperature value according to the relation model. The locomotive temperature sensor fault diagnosis and fault tolerance estimation method of the invention is advantageous in that implementation and operation are simple, the fault of the temperature sensor can be automatically diagnosed, and accurate positioning of a specific fault condition and true temperature value reconstruction or estimation are realized.

Description

technical field [0001] The invention relates to the technical field of locomotive fault diagnosis, in particular to a method for fault diagnosis and fault tolerance estimation of a locomotive temperature sensor. Background technique [0002] In the locomotive transmission control system, temperature is an important indicator to characterize the working environment and state of the equipment, such as the oil temperature of the traction transformer, the water outlet temperature sensor of the traction converter water cooling system, and the temperature of the traction motor. If the temperature is too high, the locomotive needs to take protective actions such as power reduction operation and main break to ensure the safe operation of the equipment. Due to strong vibration or even maintenance during locomotive operation, sensor failures (such as disconnection, short circuit, reverse connection, etc.) may occur. When the temperature sensor fails, the measured value of the sensor ...

AI Technical Summary

Problems solved by technology

This type of method can only realize a simple judgment of whether a fault occurs, but cannot accurately locate the specific fault that occurred. If the actual value of the temperature needs to be obtained, it needs to be measured again after the fault is removed, thus limiting the effectiveness and effectiveness of fault diagnosis. system availability

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