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Fault diagnosis method for insulation resistance detection circuit

A detection circuit and insulation resistance technology, which is applied in the field of fault diagnosis based on insulation resistance detection circuit, can solve the problems of fault diagnosis of measurement circuit and low reliability of measurement circuit, and achieve the effect of improving reliability

Inactive Publication Date: 2018-12-21
CH AUTO TECH CORP CO LTD
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  • Abstract
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Problems solved by technology

[0003] However, the above insulation resistance measurement method does not perform fault diagnosis on the corresponding measurement circuit, resulting in low reliability of the measurement circuit

Method used

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  • Fault diagnosis method for insulation resistance detection circuit
  • Fault diagnosis method for insulation resistance detection circuit
  • Fault diagnosis method for insulation resistance detection circuit

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Embodiment Construction

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0024] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...

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Abstract

The invention provides a fault diagnosis method for an insulation resistance detection circuit. The fault diagnosis method comprises the following steps of, when the insulation resistance detection circuit is electrified, judging whether the total voltage of a battery is higher than a preset voltage or not; if yes, disconnecting a first switch of a direct-current positive electrode bus to a chassis ground side and a second switch of a direct-current negative electrode bus to the chassis ground side, and judging whether a first voltage of the direct-current positive electrode bus relative to the chassis ground and a second voltage of the direct-current negative electrode bus relative to the chassis ground tend to be stable at the moment or not; and if yes, performing fault diagnosis on theinsulation resistance detection circuit according to the total voltage of the battery, the first voltage and the second voltage. According to the method, accurate fault diagnosis can be carried out onthe insulation resistance detection circuit, so that the reliability of the insulation resistance detection circuit is improved.

Description

technical field [0001] The invention relates to the technical field of insulation detection, in particular to a fault diagnosis method based on an insulation resistance detection circuit. Background technique [0002] The insulation of the electric vehicle power battery to the ground is related to the safety of the occupants in the vehicle, and the detection of its insulation is very important. Insulation resistance is an important index of insulation, and the national standard also gives the corresponding insulation resistance measurement method. In this measurement method, the smaller value of the insulation resistance on both sides is calculated by collecting the voltage of the DC positive busbar of the power battery to the vehicle body ground and the DC negative busbar to the vehicle body ground, as the insulation resistance value of the power battery to the ground. [0003] However, the above insulation resistance measurement method does not perform fault diagnosis on ...

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Application Information

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IPC IPC(8): G01R27/02G01R31/12
CPCG01R27/025G01R31/1272
Inventor 陆群曾梦远
Owner CH AUTO TECH CORP CO LTD
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