Pure electric vehicle insulation detection system and method with contactor adhesion judgment

Abstract

The invention relates to a pure electric vehicle insulation detection system and method with contactor adhesion judgment. The system comprises a power battery, a first main contactor, a second main contactor, an insulation detector and a main motor controller, wherein the positive electrode of the power battery is electrically connected with the positive electrode of the main motor controller through the first main contactor, the negative electrode of the power battery is electrically connected with the negative electrode of the main motor controller through the second main contactor, the negative electrode of the insulation detector is electrically connected with the negative electrode of the power battery, and the positive electrode of the insulation detector is electrically connected with the positive electrode of the main motor controller. According to the invention, only one path of high-voltage circuit is need for sampling, which not only can realize the insulation resistance detection of the whole vehicle, but also can detector the adhesion condition of the contactor, so that the wire harness cost and the hardware cost caused by multi-path high-voltage sampling are reduced,the complexity of the assembly process is also reduced, the complexity of comprehensive detection and judgment of the whole vehicle controller is reduced, and the integration degree is higher.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a pure electric vehicle insulation detection system and method with contactor adhesion judgment. Background technique [0002] With the increasingly serious environmental pollution and the impact of the energy crisis, in order to alleviate many problems such as the global energy crisis and the deterioration of the living environment, the development of new energy vehicles is now highly valued. my country is vigorously promoting the development and use of electric vehicles. Now Nowadays, pure electric vehicles are becoming more and more popular among the public. The pure electric vehicle power system is mainly composed of lithium power battery, charging unit (DC or AC), high-voltage maintenance switch MSD, motor or electronic control MCU system, and auxiliary power system. The high voltage range of electric vehicles is usually between 250V-750V , such a high-voltage, h...

AI Technical Summary

Problems solved by technology

[0003] However, the existing electric vehicle insulation detection methods have the following problems: 1. Most of them adopt multi-channel high-voltage circuit sampling instead of only one high-voltage circuit sampling, so as to detect the insulation resistance of the whole vehicle and judge the contactor adhesion. To detect the contactor adhesion while detecting the insulation resistance of the vehicle, it is necessary to add an additional high-voltage sampling circuit, which will lead to an increase in hardware costs; 2. The insulation fault of the vehicle and the contactor adhesion fault are sent separately. Sending will cause the complexity of the comprehensive judgment and processing of the vehicle controller

Images