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Method and system for measuring electric current

A technology for measuring current and measurement error, applied in the field of battery current measurement, to achieve the effect of compensation error, simple compensation method, and easy implementation

Inactive Publication Date: 2014-08-06
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, these two patent applications do not deal with hysteresis

Method used

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  • Method and system for measuring electric current
  • Method and system for measuring electric current
  • Method and system for measuring electric current

Examples

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Embodiment Construction

[0047] figure 1 A Hall effect sensor 1 is shown represented by a ring through which the actual current intensity IREEL passes. This sensor is connected to the battery output and measures the measured current intensity IMES based on the actual current intensity IREEL.

[0048] IMES measurements show measurement errors, namely offset and gain errors as well as errors due to hysteresis of the Hall effect sensor. Linearity errors are generally already compensated by commercially available Hall effect sensors.

[0049] The system has a measurement error compensation device 2 connected to the Hall effect sensor output, which compensates for measurement errors. At the output of the device 2, the corrected current intensity ICORR then has a smaller measurement error than the current intensity IMES.

[0050] Sensor 1 can be represented schematically as a block 3 followed by a block 4 representing the addition of the sensor 1 measurement error. Block 3 corresponds to offset and gain...

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Abstract

A system for measuring electric current supplied by an electric battery, in particular a battery in a motor vehicle, comprising: a Hall effect current sensor (1); a device (2) for compensating for measurement errors made by the sensor, comprising means (6) for applying an operation close to the inverse of an operator characterizing the magnetic hysteresis of the sensor to the measured current (IMES).

Description

technical field [0001] The present invention relates to the technical field of current sensors, and more particularly to the technical field of current sensors using the Hall effect. The invention is particularly applicable to the measurement of battery current, for example batteries fitted to motor vehicles. Background technique [0002] The use of Hall effect current sensors for measuring current is known from the prior art. These sensors are susceptible to various types of measurement errors, namely offset errors, gain and linearity errors, and errors due to hysteresis. [0003] Patent application EP 0877232 discloses a method of compensating for offset errors by simple comparison of Hall effect sensor measurements with current measurements made for known current values. [0004] Compensation for gain and linearity errors by calibration or mapping is known from the prior art. [0005] Compensation methods for errors due to sensor hysteresis are likewise known. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/20G01R33/00
CPCG01R33/0029G01R15/202G01R35/005G01R31/361G01R31/3828
Inventor P·多尔奇尼
Owner RENAULT SA
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