Insulation fault detection method and control device

An insulation fault and detection method technology, applied in the detection field, can solve the problems of not being too small resistance, long sampling cycle, long fault reporting cycle, etc., to achieve the effect of ensuring detection accuracy and shortening confirmation time

Active Publication Date: 2019-10-29
컨템포러리엠퍼렉스테크놀로지씨오리미티드
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Problems solved by technology

[0004] The inventors found that there are at least the following problems in the prior art: in the bridge balance method, the voltage sampling can only be performed after the voltage of the detection branch is stable; and, in order not to affect the actual insulation of the whole vehicle, the resistance connected to the detecti

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  • Insulation fault detection method and control device
  • Insulation fault detection method and control device

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, various implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in this application can also be realized.

[0024] The first embodiment of the present invention relates to an insulation fault detection method, including a setting step and a detection step. Such as figure 1 Shown is a flow chart of the insulation fault detection method according to this embodiment, wherein the setting step includes step 101, and t...

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Abstract

The embodiment of the invention relates to the technical field of electric vehicles, and discloses an insulation fault detection method and a control device. The method comprises the following steps:setting first detection time and second detection time, wherein the first detection time and the second detection time are duration required by an insulation fault detection circuit to reach a stablestate in a first connection state and a second connection state when the resistance value of an insulation resistor is a preset fault threshold; switching the insulation fault detection circuit to thefirst connection state, and sampling from a detection point to obtain a first voltage value when first detection time is up; switching to the second connection state, and sampling from the detectionpoint to obtain a second voltage value when the second detection time is up; calculating an estimated resistance value of the insulation resistor at least according to the first voltage value and thesecond voltage value; and obtaining a fault detection result according to the estimated resistance value and the fault threshold. The embodiment of the invention further provides a control device. Theembodiment method and device of the invention can shorten the insulation fault confirmation time and quickly report the insulation fault.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of detection, and in particular to an insulation fault detection method and a control device. Background technique [0002] The replacement of fuel vehicles by electric vehicles has become the development trend of the automobile industry. The mileage, service life and safety of battery packs are all very important for the use of electric vehicles. The battery pack is one of the key components of electric vehicles, and its high-voltage safety must be one of the primary considerations for the battery pack system. Therefore, the detection of the insulation performance of electric vehicles is an essential part of the design. [0003] At this stage, the bridge balance method is commonly used. By connecting the positive pole and the ground of the battery pack in parallel, and between the negative pole and the ground, the detection branch (the detection branch contains a megohm resistance)...

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Application Information

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IPC IPC(8): G01R31/14
CPCG01R31/14
Inventor 马行黄学文
Owner 컨템포러리엠퍼렉스테크놀로지씨오리미티드
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