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Battery current sensor fault diagnosis system and method thereof

A technology for current sensors and sensor failures, applied in instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as increasing system costs, and achieve the effect of improving reliability and safety

Inactive Publication Date: 2013-07-10
SHANGHAI YIRUI AUTOMOBILE TECH
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  • Abstract
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Problems solved by technology

However, this method will inevitably increase the system cost in industrial applications.

Method used

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  • Battery current sensor fault diagnosis system and method thereof
  • Battery current sensor fault diagnosis system and method thereof
  • Battery current sensor fault diagnosis system and method thereof

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Embodiment Construction

[0041] The present invention will be further explained in detail below in conjunction with the accompanying drawings, which are a preferred example of various implementations of the present invention. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

[0042] Such as figure 1 It is an embodiment of the current sensor fault diagnosis system of the present invention, mainly including: a current sensor signal sampling module 1, a battery terminal voltage sampling module 2, a battery terminal voltage redundant sampling module 3, a diagnosis strategy module 4, and a fault protection module 5.

[0043] The current sensor signal sampling module 1 is connected with the sampling signal line of the current sensor in the battery pack, and is used to convert the sampling signal into a current sampling value through a calculation formula, denoted as I 1 ;

[0044] The bat...

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Abstract

The invention provides a battery current sensor failure (short circuit, open circuit and function deviation) fault diagnosis system and a method thereof. Firstly, a diagnosis system is established and mainly comprises a current sensor signal sampling module, a battery terminal voltage sampling module, a battery terminal voltage redundancy sampling module, a diagnosis strategy module and a fault protection module. Secondarily, a diagnosis strategy is established, and a base method comprises calculating a terminal voltage response value through a battery voltage response algorithm according to the current sampled value of a current sensor; then processing and comparing a calculated value of terminal voltage with a sampled value of the terminal voltage through a setting algorithm; and judging whether current sensor failure happens. The battery current sensor fault diagnosis system improves detectability of accidental failure of a battery current sensor of a new energy automobile and enhances safety of the new energy automobile using high voltage battery.

Description

technical field [0001] The invention belongs to the field of new energy vehicle control, and relates to a fault diagnosis system and method for battery current sensor failure (short circuit, open circuit, function deviation). Background technique [0002] The high-voltage battery is the energy source storage and supply system of new energy vehicles, and its normal operation is related to the overall safety level and function realization of the vehicle. Accurately detecting whether the battery system is outputting current normally is an important function of the battery management system and its current sensor, which is related to the safe operation of the battery system and the accurate calculation of important parameters of the battery, such as the state of charge (SOC) and the current input and output power. The more common current sensors include Hall-type and resistive current sensors. The detected current value is transmitted to the battery management system through a ...

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Application Information

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IPC IPC(8): G01R31/02G01R35/00
Inventor 袁永军王珂刘天翼王志强
Owner SHANGHAI YIRUI AUTOMOBILE TECH
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