Vehicle body insulation resistance test method

A testing method and insulation resistance technology, which is applied in the field of testing the insulation resistance of the car body, can solve problems affecting the measurement effect and achieve stable and reliable test results

Inactive Publication Date: 2016-07-06
OPTIMUM BATTERY CO LTD
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Problems solved by technology

[0012] Aiming at the defects of the prior art, the object of the present invention is to provide a method for measuring the insulation resistance of the vehicle body, aiming to solve the problem that the bus voltage of the c

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  • Vehicle body insulation resistance test method
  • Vehicle body insulation resistance test method

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] An electric vehicle is a complex mechatronic product, and many of its components, including power batteries, motors, chargers, energy recovery devices, auxiliary battery charging devices, etc., will involve high-voltage electrical insulation problems. The working conditions of these components are relatively harsh. Vibration, corrosion of acid and alkali gases, changes in temperature and humidity may cause rapid aging of power cables and other insulating materials or even damage to insulation, greatly reducing the insulation strength of equipment and endangering personal safety. The inventio...

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Abstract

The invention provides a method for testing the insulation resistance of a vehicle body, comprising the following steps: (1) generating a low-frequency AC signal and injecting the low-frequency AC signal into the vehicle body; (2) obtaining U through a first-level measurement circuit 9_30 ; 9‑30 The average value in one cycle reflects the unbalanced condition of the positive and negative poles to the body resistance; the variation dU in half a cycle 9_30 Participate in the calculation of the resistance value of the second-level measurement as the fluctuation parameter of the bus voltage; (3) obtain the AC voltage amplitude U through the second-level measurement circuit 9_25 , a single insulation resistance R = F (U 9_25 )*W, W is the weight, W=f(dU 9_30 ); (4) Take the average value of each measurement to obtain the vehicle body insulation resistance Ravr=(w1*R1+w2*R2+.....Wn*Rn)/(w1+w2+....Wn). On the basis of the original low-frequency signal injection method, the present invention correlates the weight of the weighted filter when calculating the insulation resistance with the variation of the DC bus voltage fluctuation, the weight is small when the bus voltage fluctuates greatly, and the weight is large when the bus voltage fluctuates small, thus Make the test results tend to be stable and reliable.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and more specifically relates to a method for testing the insulation resistance of a vehicle body. Background technique [0002] With the increasing requirements of human society for environmental protection, electric vehicles have begun to be paid attention to and developed all over the world. Various technologies related to electric vehicles have also been developed accordingly. As my country is a big oil importing country, the development of electric vehicles has more strategic significance for energy security. As a relatively backward country in the automobile industry, electric vehicles also carry the country's expectation of overtaking in curves in the automobile industry. As one of the electric vehicle technologies, insulation monitoring has been developed in many ways. The international standard for electric vehicles stipulates that the insulation resistance value divided by the nomina...

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Application Information

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IPC IPC(8): G01R27/02H03H11/46
CPCG01R27/025H03H11/46
Inventor 哈玉九尹旭勇文明李瑶
Owner OPTIMUM BATTERY CO LTD
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