Detection and control circuit and detection method of electric vehicle high voltage circuit

Abstract

The invention discloses a detection and control circuit and detection method of an electric vehicle high voltage circuit. The detection and control circuit comprises a plurality of high voltage devices, a battery management module, a high voltage control module and a vehicle control unit, wherein each high voltage device is connected with a contactor and / or a fuse; the battery management module isused for enabling a main negative contactor and generating main negative contactor enabling signals; the high voltage control module is used for detecting the voltage at the back end of each fuse andgenerating the fuse detection signals, detecting the voltage at the back end of each auxiliary contact of each contactor and generating the contactor contact detection signals, and enabling each contactor except the main negative contactor and generating the contactor enabling signals; and the vehicle control unit is used for judging the working state of the fuses and the contactors according tothe obtained fuse detection signals, the contactor contact signals, the contactor enabling signals and the main negative contactor enabling signals. The detection and control circuit of the electric vehicle high voltage circuit solves the problem of misjudging the contactors as abnormal when the fuses are fused, and can accurately judge the working states of the contactors.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a detection and control circuit of a high-voltage circuit of an electric vehicle. Background technique [0002] At present, electric vehicles use a single BMS control and acquisition for high-voltage contactor control, high-voltage loop current collection, and high-voltage contactor status judgment. The state of the contactor (disconnected, closed, abnormal, adhesion). [0003] Use a single component BMS to control all high-voltage contactors and judge the status of the contactors by collecting the back-end voltage of the contactor (the back-end refers to the contact on the electrical appliance side), but it is not accurate to judge the state of the contactor by collecting the back-end voltage of the contactor, because In the existing high-voltage circuit, it is impossible to judge whether the fuse of the current circuit is blown. After the fuse is blown, t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to: aim at the above technical problems, to provide a high-voltage circuit detection and control circuit for electric vehicles, so as to realize the collection of fuses and contactor back-end voltages and correctly judge the working status of contactors; High-voltage contactor, the problem that the high-voltage contactor cannot be safely controlled when the control module fails

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