Electric vehicle high voltage system health state diagnosis and early warning circuit and method

Abstract

The invention provides an electric vehicle high-voltage electric system health state diagnosis and early warning circuit and method, including: an insulation resistance detection module, a connection resistance detection module, a battery management module, a motor control module, a pre-charging monitoring module, a relay monitoring module, a control Calculation module, the above-mentioned module is used for online detection of the insulation resistance value between the series battery pack and the body ground of the electric vehicle, the connection resistance value of the high-voltage line, the health status of the series battery pack, the voltage of the series battery pack, and the current of the series battery pack , The fault level of the driving motor system, the voltage of the DC input terminal of the driving motor system, the current of the DC input terminal of the driving motor system, the fault level of the pre-charging circuit, and the fault level of the relay. The invention realizes the quantitative comprehensive characterization and online identification of the health state of the high-voltage system, thereby enabling more scientific and reasonable high-voltage safety management on the safety state of the high-voltage system of the electric vehicle.

Description

technical field [0001] The invention relates to electric vehicle high-voltage safety technology, in particular to an electric vehicle high-voltage system health state diagnosis and early warning circuit and method. Background technique [0002] Electric vehicles have become the focus and focus of global development. In order to meet the demand of high-power electric drive, the current passing through the high-voltage circuit of the car is as high as hundreds of amperes. High-voltage safety has become the key technology that needs to be solved first in the application of electric drive vehicles, and has a very important impact on the safety of the vehicle itself, the safety of drivers and passengers, and the safety of the vehicle operating environment. At present, although there are detection and diagnosis methods for high-voltage safety faults such as high-voltage circuit connection resistance faults and insulation resistance faults, there is a lack of comprehensive charact...

AI Technical Summary

Problems solved by technology

At present, although there are detection and diagnosis methods for high-voltage safety faults such as high-voltage circuit connection resistance faults and insulation resistance faults, there is a lack of comprehensive characterization methods and diagnostic and early warning methods for the health status of high-voltage power systems. The scientific basis for safety management has resulted in the abuse of the high-voltage system and the frequent occurrence of high-voltage safety accidents, making it difficult to effectively solve the hidden dangers of high-voltage safety in electric vehicles

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