Health state diagnosis early-warning circuit and method of electric automobile high-voltage system

Abstract

The invention provides a health state diagnosis early-warning circuit and method of an electric automobile high-voltage system. The circuit comprises an insulation resistance detection module, a connecting resistance detection module, a battery management module, a motor control module, a pre-charging monitoring module, a relay monitoring module and a control computing module. The modules are used for detecting an insulation resistance value between a serial-connection battery pack of an electric automobile and an automobile body, a connecting resistance value of a high-voltage circuit, the health state, voltage and current of the serial-connection battery pack, a fault grade of a driving motor system, voltage and current of the direct-current input end of the driving motor system, a fault grade of a pre-charging circuit and a fault grade of a relay on line. Quantified comprehensive representation and on-line recognition are achieved for the health state of the high-voltage system, and therefore high-voltage safe management is performed on the safety state of the electric automobile high-voltage system more scientifically and reasonably.

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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