Method for detecting fault of high-voltage circuit of blade electric vehicle

Abstract

The invention discloses a method for detecting a fault of a high-voltage circuit of a blade electric vehicle and belongs to the field of new energy automobiles. The method comprises the steps that interlocking signals of a main discharge circuit, a motor three-phase discharge circuit and a high-voltage accessory circuit are obtained; when any of the interlocking signals of the main discharge circuit, the motor three-phase discharge circuit and the high-voltage accessory circuit meets a preset fault condition, a fault signal is fed back; according to the fed back fault signal, a motor is controlled to stop outputting power, and a high-voltage relay is disconnected with a power source. According to the method, the high-voltage circuit to be detected is divided into the main discharge circuit, the motor three-phase discharge circuit and the high-voltage accessory circuit to be detected, when the high-voltage circuit breaks down, fault points on the main discharge circuit, the motor three-phase discharge circuit and the high-voltage accessory circuit can be detected respectively, and therefore the search range of the fault points is effectively narrowed.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a fault detection method for a high-voltage loop of a pure electric vehicle. Background technique [0002] A pure electric vehicle is a vehicle powered entirely by rechargeable batteries (such as lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries or lithium-ion batteries). An important feature of a pure electric vehicle is that it is equipped with a high-voltage loop that provides driving energy. Normally, an electric vehicle uses a voltage of more than 300 volts, and the current can reach tens of amperes or even hundreds of amperes during normal operation. , which requires electric vehicle manufacturers to carry out pre-safety control of the high-voltage electric shock risk during the operation and maintenance of the high-voltage loop. Reliable use of high voltage loops. [0003] Usually, the solution for fault detection of the high-voltage loop of...

AI Technical Summary

Problems solved by technology

[0005] The maintenance personnel of the vehicle will use the detector to find the fault points of the wire connectors on the high-voltage loop of the pure electric vehicle in turn. Find the fault point. Since there are many wire connectors in the location that needs to be searched, the search time will be longer, resulting in a longer maintenance time for the vehicle.

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