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Method for judging contactor adhesion failure in high voltage circuit with battery in electric car

A high-voltage circuit, electric vehicle technology, applied in electric vehicles, battery/fuel cell control devices, electrical devices, etc., can solve the problems of cumbersome, affecting the normal operation of the system, difficult to quickly find the fault location, etc. adaptable effect

Inactive Publication Date: 2017-05-24
天津易鼎丰动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the contactor has a sticking failure, it will no longer be able to perform its normal function, thus affecting the normal operation of the system
The conventional method of contactor adhesion fault analysis is cumbersome, and it is difficult to quickly find the fault location and solve the problem

Method used

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  • Method for judging contactor adhesion failure in high voltage circuit with battery in electric car
  • Method for judging contactor adhesion failure in high voltage circuit with battery in electric car

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0012] The method of the invention is adopted on the basis of not changing the existing high-voltage electrical connection structure of the electric vehicle. Such as figure 1 The structure of the existing high-voltage circuit of the battery is as follows: a power battery 1 and a total negative contactor 2 are connected in series between the battery high-voltage positive pole and the left side of the battery high-voltage negative pole through a circuit connection line, and the high-voltage positive pole of the battery is connected in series. There are two branches connected in parallel with each other, one branch is connected with the main contactor 3, and the other branch is connected in series with the pre-charging relay 4 and the pre-charging resistor.

[0013] A method for judging a contactor adhesion fault in a high-voltage circuit of a batt...

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Abstract

The invention discloses a method for judging contactor adhesion failure in a high voltage circuit with a battery in an electric car. The method comprises following steps: (1) closing a total negative contactor in the high voltage circuit with the battery in the electric car, and detecting a total voltage changing situation between the high-voltage positive pole and the high-voltage negative pole, judging that adhesion failure happens to the master contactor in the high voltage circuit with the battery if the total voltage suddenly changes, and judging that adhesion failure happens to a pre-charged relay in the high voltage circuit with the battery if the total voltage gradually changes, (2) closing the pre-charged relay and disconnecting the total negative contactor, and then detecting the total voltage changing situation if the total voltage does not change, and judging that adhesion failure happens to the total negative contactor if the total voltage changes. The method can quickly determine failure locations.

Description

technical field [0001] The invention relates to a method for judging a contactor adhesion fault in an electric vehicle. Background technique [0002] There are many contactors in electric vehicles, and contactors can quickly cut off the AC and DC main circuits and can frequently connect to high-current control circuits. The contactor can not only connect and cut off the circuit, but also has the function of low voltage release protection, which plays an extremely important role in electric vehicles. If the contactor has a sticking failure, it will no longer be able to perform its normal function, thus affecting the normal operation of the system. The conventional method of contactor adhesion fault analysis is cumbersome, and it is difficult to quickly find the fault location and solve the problem. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for judging the contactor adhesio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L3/00B60L11/18
CPCB60L3/0023B60L58/10B60L2240/547Y02T10/70
Inventor 吴家驹杜森谢立洁翟世欢徐梓荐周振通
Owner 天津易鼎丰动力科技有限公司
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