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Fault diagnosis method and system for a temperature sensor

A temperature sensor and fault diagnosis technology, applied in thermometers, thermometer testing/calibration, instruments, etc., can solve the problems of increasing hardware volume and cost, improve effective utilization, reduce redundant quantities, and avoid misjudgment of battery status. Effect

Active Publication Date: 2019-03-05
FUZHOU DANLAW XICHENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is an effective method, but it undoubtedly increases the hardware size and cost

Method used

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  • Fault diagnosis method and system for a temperature sensor
  • Fault diagnosis method and system for a temperature sensor
  • Fault diagnosis method and system for a temperature sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Please refer to Figure 1-5 , Embodiment 1 of the present invention is:

[0084] A kind of fault diagnosis method of temperature sensor provided by the present invention comprises:

[0085] Step 1, preset the number of tests and the number of abnormalities; the threshold of the number of tests is the first number of tests; the threshold of the number of abnormalities is the first number of abnormalities; the number of tests and the number of abnormalities are initialized, specifically: the number of tests K y and the number of abnormalities K x The recorded number of times is cleared (K y = 0,K x =0). The first number of tests is set to 50 times, and the first number of abnormalities is set to 5 times.

[0086] Step 2. Obtain the first temperature data T of the single battery casing through the temperature sensor to be tested s ;

[0087] Step 3. Calculate the shell temperature of the single battery according to the least squares algorithm and the thermal model ...

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Abstract

The invention relates to the field of fault diagnosis, and in particular to a temperature sensor fault diagnosis method and system for improving effective utilization rates of resources. According tothe method, a software manner and a hardware manner are adopted to respectively obtain the temperature data of a unit cell case; the temperature data obtained through the two manners is compared; if areasonable frequency range is exceeded in multiple obtaining test processes, the fact that a fault condition occurs is determined; abnormal information stored in an abnormal database is combined to carry out analysis; and if abnormal information is not stored in the abnormal database, the fact that a to-be-tested temperature sensor breaks down is determined. The temperature sensor fault diagnosismethod and system is not only capable of avoiding the wrong cell state judgement caused by temperature sensor faults, but also capable of greatly decreasing the redundant number of the temperature sensors, does not need to obtain data of the abnormal database in real time, and only needs to obtain the data of the abnormal database when fault conditions are preliminarily determined, thereby greatly improving the effective utilization rates of system resources.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a fault diagnosis method and system for a temperature sensor. Background technique [0002] The power battery system is the main power or auxiliary power source of various electric vehicles, and its normal operation depends on the battery management system to accurately estimate the current SOC / SOH state of the power battery. The power battery management system must rely on the data of the temperature sensor in its system to estimate the state of the battery. Therefore, the reliability of the data obtained by the temperature sensor directly affects the accurate estimation of the state of the power battery. [0003] In order to ensure the reliability of the data obtained by temperature sensors, many current battery management systems mostly adopt the method of multi-sensor redundant arrangement, that is, two or more temperature sensors are used to measure the same group of signals,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K15/00G01R31/36G01R31/385
CPCG01K15/007G01R31/387G01R31/392
Inventor 郑昕斌陈颖
Owner FUZHOU DANLAW XICHENG ELECTRONICS TECH CO LTD