Electric vehicle insulation resistance detection method and system with selectivity

Abstract

The invention provides an electric vehicle insulation resistance detection method and system with selectivity. The positive electrode voltage to ground and the negative electrode voltage to ground ofthe battery total voltage of a battery system of an electric vehicle are measured through a high-voltage power battery, a power distribution system and a voltage division circuit. Equivalent insulation resistance values of the positive electrode and the negative electrode of the battery system to the ground and equivalent insulation resistance values of the positive electrode and the negative electrode of a load system to the ground are calculated, the calculated equivalent insulation resistance values are compared with a preset minimum insulation resistance value, and whether an insulation fault occurs or not is judged. The ground insulation resistance of the positive and negative electrodes of the battery system and the ground insulation resistance of the positive and negative electrodesof the load system of the electric vehicle can be accurately detected and positioned, the whole process is automatically completed by a control system, and the detection efficiency and accuracy are improved. The problem that the insulation detection sampling modes of a battery system and different load systems are complex and not selective in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle insulation detection, in particular to a selective electric vehicle insulation resistance detection method and system. Background technique [0002] As a green and environment-friendly means of transportation, electric vehicles have been used more and more. Many countries and regions have supported the promotion and use of electric vehicles in terms of policies, and their market share will increase in the future. As the power battery system of electric vehicles, different models have great differences, but all have exceeded the safe voltage range. If the power voltage insulation drops and an electric shock fault occurs, it will directly endanger the lives of personnel and the safety of equipment. Therefore, in the operation of electric vehicles, it is necessary The insulation status is detected in real time. When the insulation of the components drops, it is necessary to be able to identi...

AI Technical Summary

Problems solved by technology

As the power battery system of electric vehicles, different models have great differences, but all have exceeded the safe voltage range. If the power voltage insulation drops and an electric shock fault occurs, it will directly endanger the lives of personnel and the safety of equipment. Therefore, in the operation of electric vehicles, it is necessary Detect the insulation status in real time. When the insulation of the components drops, it mus

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