Electric motor coach high-voltage load system fault diagnosis method based on multi-domain sparse representation

Abstract

The invention relates to an electric motor coach high-voltage load system fault diagnosis method based on multi-domain sparse representation, and belongs to the field of electric motor coach high-voltage load system-level fault diagnosis. The method comprises a preparation process before diagnosis and a diagnosis process, the electric motor coach is tested for multiple times before diagnosis, current response signals are obtained, and dictionary matrixes in a time domain, a frequency domain and a geometric domain are constructed respectively; in the diagnosis process, a current response signal of a test sample is firstly collected, then the current response signal is sparsely expressed in a time domain, a frequency domain and a geometric domain by using a labeled sample dictionary matrix, sparse vectors in the time domain, the frequency domain and the geometric domain are obtained by using a batch matching pursuit algorithm, the sparse vectors in the three domains are fused, and the diagnosis result is obtained. And processing the test sample and identifying the fault mode of the test sample. The method is used for fault diagnosis of the high-voltage load system of the electric motor coach, and potential risks of the high-voltage system of the electric motor coach are found and eliminated in time.

Description

technical field [0001] The invention belongs to the field of high-voltage load system-level fault diagnosis of electric passenger cars, and relates to a fault diagnosis method for high-voltage load systems of electric passenger cars based on multi-domain sparse expression. Background technique [0002] In order to alleviate the energy crisis and reduce environmental pollution, electric buses have achieved rapid development in recent years, and have been promoted in batches in many cities. However, since the power battery voltage platform of the electric bus is up to 750V, and the power is up to 500KWh, or even more, both the voltage platform and the stored power are much higher than those of the electric passenger car, and as a public transportation for passengers, the electric bus The passenger capacity also far exceeds that of private electric passenger cars. Therefore, the safety of the high-voltage system of electric passenger cars is very important. Once the high-voltag...

AI Technical Summary

Problems solved by technology

[0004] There are few studies on the system-level fault diagnosis and location of electric buses, which provides obstacles for the intelligent maintenance of urban buses

Images