Electric automobile body insulation detection system and method

A detection system, electric vehicle technology, applied in the direction of testing dielectric strength, etc., can solve the problem that symmetrical insulation faults cannot be measured, achieve high precision, and enhance the effect of human-computer interaction

Active Publication Date: 2017-05-24
BIT HUACHUANG ELECTRIC VEHICLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method fundamentally solves the shortcoming that the positive and negative busbars of the electric vehicle battery cannot be measured for symmetrical insulation faults to the ground, and it can also detect the insulation performance between the high-voltage circuit and the car body when the battery is open.

Method used

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  • Electric automobile body insulation detection system and method
  • Electric automobile body insulation detection system and method
  • Electric automobile body insulation detection system and method

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Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the electric vehicle body insulation detection system described in the embodiment of the present invention includes a power protection circuit, an MCU micro control unit, a power isolation circuit, a voltage injection circuit, an internal storage circuit, a detection voltage injection feedback circuit, a resistance measurement circuit, a CAN , LED indicating running state circuit, switching value or PWM indicating insulation fault level circuit; the power protection circuit is connected to the low-voltage auxiliary power supply of the electric vehicle, and supplies power to the insulation detection system of the electric vehicle body from the low-voltage auxiliary power supply; the power protection circuit and the MCU micro There is a power isolation circuit between the control units, and the power isolation circuit is used for direct electrical isolation in the high and low voltage system when the high voltage system performs voltage injection...

Embodiment 2

[0057] In combination with Embodiment 1, taking the insulation resistance detection and insulation failure as an example after one power-on, the electric vehicle body insulation detection system and detection method of the present invention are further described.

[0058] Such as Figure 7 As shown, an electric vehicle body insulation detection system is installed on an actual vehicle. At the same time, a 20MΩ resistor is connected to the high-voltage positive bus with a high-voltage battery of 600V to the vehicle body, and a 330KΩ resistor is connected to the high-voltage negative bus to the vehicle body. Then close the main switch of the low-voltage power supply of the vehicle, commonly known as the "big gate". At this time, the low-voltage power supply vehicle supplies power to the insulation detection system normally. The insulation detection system starts to work normally, and at the same time, the number of power-on times is increased by 1 and stored in the internal stor...

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PUM

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Abstract

The invention relates to an electric automobile body insulation detection system and method. The electric automobile body insulation detection system comprises a power supply protection circuit, an MCU (Micro Control Unit), a power supply isolation circuit, a voltage injection circuit, an internal storage circuit, a detection voltage injection feedback circuit, a resistance measurement circuit, a CAN, an operating state indication circuit, a switching value or PWM insulation fault level indication circuit. The electric automobile body insulation detection system further retains high precision of insulation resistance measurement on the basis of reducing the injection voltage and current, and can also assess which side of positive and negative buses has lower insulation resistance for the automobile body.

Description

technical field [0001] The invention relates to the technical field of electrical insulation detection of electric vehicles, in particular to an electric vehicle body insulation detection system and detection method. Background technique [0002] With the rapid development of pure electric new energy vehicles in China, the safety performance of pure electric new energy vehicles has attracted more and more attention. In pure electric new energy vehicles, there is a high-voltage system with a voltage greater than 300V. If the positive pole (or negative pole) of the high-voltage battery is poorly insulated from the chassis of the car body, it may affect the normal operation of some controllers on the vehicle and endanger the safety of drivers and passengers. Therefore, an insulation detection system for detecting the insulation performance of the vehicle's high-voltage battery to the vehicle body is needed. [0003] Common solutions for insulation detection systems on the mark...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 林程时军辉董爱道覃建华
Owner BIT HUACHUANG ELECTRIC VEHICLE TECH
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