High-voltage interlocking fault detection method and device and automobile

Abstract

The invention discloses a high-voltage interlocking fault detection method and device and an automobile. The method comprises the steps of acquiring a first voltage signal through a first port of a high-voltage interlocking fault detection circuit, and acquiring a second voltage signal through a second port; filtering the first voltage signal to obtain a first filtering signal, and filtering the second voltage signal to obtain a second filtering signal; calculating a first fluctuation parameter according to the first filtering signal, and calculating a second fluctuation parameter according tothe second filtering signal; determining a first fault judgment threshold value according to the first fluctuation parameter, and determining a second fault judgment threshold value according to thesecond fluctuation parameter; performing high-voltage interlocking fault detection and judgment on the first port according to the first fault judgment threshold, and performing high-voltage interlocking fault detection and judgment on the second port according to the second fault judgment threshold; and if the first port has the high-voltage interlocking fault and / or the second port has the high-voltage interlocking fault, judging that the vehicle has a high-voltage interlocking fault. According to the invention, the problem of fault false alarm caused by electromagnetic interference is solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a high-voltage interlock fault detection method, device and automobile. Background technique [0002] With the rapid popularization and development of pure electric vehicles, the public has higher and higher requirements for vehicle power performance, such as better acceleration performance and higher maximum speed, etc. However, unlike traditional fuel vehicles, pure electric vehicles All energy comes from high-voltage power batteries, so many components are powered by high-voltage batteries. [0003] Driven by the public's requirements for vehicle power performance, the output voltage of high-voltage power batteries for pure electric vehicles is gradually increasing. At present, the output voltage of power batteries for mainstream pure electric vehicles has reached nearly 500V. Different from alternating current, high-voltage direct current is more dangerous. When the same...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a high-voltage interlock fault detection method, device and automobile, which solves the false alarm problem of high-voltage interlock fault detection caused by unreal fault factors such as electromagnetic interference

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