Calibration method and calibration circuit of current measuring system used for measuring storage battery current in motor vehicle

A current measurement and calibration circuit technology, applied in the direction of measuring electrical variables, measuring electricity, measuring only current, etc., can solve the problems of expensive resistance and measuring amplifier, inaccurate measurement results, etc., to achieve the effect of improving operational safety

Inactive Publication Date: 2011-11-09
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But such temperature-stable and long-term stable resistors and measuring amplifiers are on the one hand very expensive and on the other hand still change over time, making the measurement results imprecise

Method used

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  • Calibration method and calibration circuit of current measuring system used for measuring storage battery current in motor vehicle
  • Calibration method and calibration circuit of current measuring system used for measuring storage battery current in motor vehicle

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Embodiment Construction

[0018] figure 1 A detail of the motor vehicle electrical system is shown schematically and in a circuit diagram. In the vehicle electrical system, a device is provided for measuring the battery current I B The measuring system 200 of the measuring system is arranged in this example between the positive pole 301' and ground in the motor vehicle electrical system. The measuring system 200 comprises a main measuring resistor 210 having a resistance value R and a measuring resistor 210 for amplifying the battery current I due to the resistor 210 B while dropping the voltage and is used to output the measuring voltage U S The measurement amplifier 220. The measuring voltage U S and battery current I B There is a relationship defined by measuring system 200 , wherein in the prior art measuring system 200 or its components are designed or selected such that a temperature-stable and long-term stable relationship results. That is, in the prior art, the calibration is usually impl...

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Abstract

The invention relates to a calibration method of a current measuring system (200) used for measuring storage battery current (IB) in a motor vehicle. The calibration current (IK) is guided to pass through calibration resistance (110) and the current measuring system (200). The current measured by the current measuring system (200) is compared with the calibration current (IK), and the calibration of the current measuring system (200) is conducted based on the comparison.

Description

technical field [0001] The invention relates to a calibration method and a calibration circuit for a current measuring system for measuring the battery current in a motor vehicle. Background technique [0002] In order to recognize the state of the battery in a motor vehicle, the temperature, current and / or voltage are usually detected and processed by means of suitable algorithms. Typically, a microcontroller or a corresponding computing unit is used here. To sense current, a shunt resistor is usually used. [0003] EP 0 990 167 B1 discloses a correspondingly designed battery measuring terminal for current measurement, which has a measuring resistor (bypass) inside it as well as a measuring and signal processing unit via a data line For example, the LIN bus is connected to the control unit of the motor vehicle. Such "smart" battery terminals are complex, complicated and expensive. [0004] As a development, it is proposed in DE 10 2008 041 539 A1 that the battery termin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01R31/36
CPCG01R1/203G01R19/0092G01R35/005G01R31/3606G01R31/382
Inventor M·沃尔夫
Owner ROBERT BOSCH GMBH
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