Method and system for estimating the insulation resistance between a battery and an electrical earth

A technology of insulation resistance and electrical grounding, applied in the field of electric dipole measurement, can solve the problems of complexity, high cost, and unreliable measurement technology, and achieve the effect of reducing functionality

Active Publication Date: 2014-12-10
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It thus appears that existing measurement tech

Method used

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  • Method and system for estimating the insulation resistance between a battery and an electrical earth
  • Method and system for estimating the insulation resistance between a battery and an electrical earth
  • Method and system for estimating the insulation resistance between a battery and an electrical earth

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Embodiment Construction

[0044] exist figure 1 In , a measuring circuit CM is shown, comprising a resistor R and a capacitor CE, which is connected to a terminal of the high-voltage battery Batt of the electric vehicle equipment. The battery Batt is eg a rear wheel or front wheel drive battery of the electric vehicle.

[0045] By means of the measuring line CM, the insulation resistance Risol can be determined. The resistance Risol is the resistance between one terminal or any other point of the battery Batt and the electrical ground M of the vehicle.

[0046] The measurement circuit CM comprises an input terminal intended to receive the input voltage Ue and an output terminal connected to one of these terminals of the battery Batt. The resistance R of the measuring line CM has a known value and the coupling capacitance CE of this measuring line has a value to be determined.

[0047] In order to determine the capacitance CE on the one hand and the resistance Risol between this terminal connected to...

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Abstract

A method for estimating the insulation resistance between a terminal of a battery (Batt) and an electrical earth, comprising: -connection of a measuring circuit (CM) to one terminal of the battery (Batt), said measuring circuit comprising a resistance (R) of known value and a capacitance (CE); and -application (1) of a known input signal having an input voltage (Ue). The method further comprises: -measurement (2) of an output voltage between the earth and a point (P) located between the resistance (R) of known value and the capacitance (CE); -determination (3) of a complex impedance of a dipole consisting of the capacitance (CE) and the insulation resistance (Risol) or determination of the parameters of a differential equation; and -determination (4) of the insulation resistance (Risol) from the parameters of the differential equation or said complex impedance.

Description

technical field [0001] The technical field of the invention relates to the measurement of electric dipoles, and more precisely to the measurement of insulation resistance in, for example, vehicles including high voltage batteries. Background technique [0002] In an electric vehicle or an electric hybrid vehicle that includes a high voltage battery, at a point on the battery that is connected to the high voltage (for example: the positive or negative terminals of the battery or the connectors between the cells of the battery, or the high voltage The insulation resistance between the bus) and the electric ground electrode of the vehicle is an indispensable safety component. In fact, it is the insulation resistance that makes it possible to prevent any electric shock to the vehicle occupants or to living organisms that come into contact with the vehicle. [0003] Measuring this resistance is indispensable in order to detect and then correct any insulation fault before a secon...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R27/02
CPCG01R31/025G01R27/025G01R31/52G01R31/1227
Inventor L·科尔代塞M·门斯勒S-A·兰迪D·沙特鲁S·卡尔库埃
Owner RENAULT SA
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