CN105698970A - Battery pack temperature detection circuit fault diagnosis method - Google Patents
Battery pack temperature detection circuit fault diagnosis method Download PDFInfo
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- CN105698970A CN105698970A CN201610073830.6A CN201610073830A CN105698970A CN 105698970 A CN105698970 A CN 105698970A CN 201610073830 A CN201610073830 A CN 201610073830A CN 105698970 A CN105698970 A CN 105698970A
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of automobile parts and provides a battery pack temperature detection circuit fault diagnosis method which comprises the following steps: temperature values of all temperature sensors are collected, and temperature values that are greater than a first preset temperature value or smaller than a second preset temperature value are removed; the highest temperature value, the second highest temperature value, the lowest temperature value and the second lowest temperature value are obtained by comparing the remaining temperature values of the temperature sensors; when the difference between the highest temperature value and the second highest temperature value as well as the difference between the lowest temperature value and the second lowest temperature value are smaller than a third preset temperature value, and the temperature change rate of each temperature sensor is smaller than a preset change rate, the highest temperature value and the second highest temperature value are output. According to the battery pack temperature detection circuit fault diagnosis method, by obtaining the difference between the highest temperature value and the second highest temperature value in the temperature values of all the temperature sensors as well as the difference between the lowest temperature value and the second lowest temperature value in the temperature values of all the temperature sensors, whether the temperature sensors which are also called thermistors are micro-short-circuited when connected to the ground or a power source can be determined, and therefore the service life of a single-cell battery and the performance of a whole automobile can be maintained.
Description
Technical field
The invention belongs to technical field of automobile control, be specifically related to a kind of battery bag temperature sensing circuit method for diagnosing faults。
Background technology
Electric automobile has become as the trend of future development, one core component of electric automobile is battery bag, in order to detect the temperature of battery bag, usual battery bag is connected to battery bag temperature sensing circuit, include multiple thermally sensitive temperature sensor being connected to battery bag diverse location, if during the extreme temperatures of existing battery bag temperature sensing circuit thermally sensitive temperature sensor, then it is equivalent to thermally sensitive temperature sensor and is short-circuited with power supply；If the temperature of thermally sensitive temperature sensor is extremely low, then be equivalent to thermally sensitive temperature sensor be short-circuited, need this to carry out fault diagnosis。Generally first gather the temperature value of each thermally sensitive temperature sensor, it is judged that whether each temperature value is more than 125 DEG C, or less than-40 DEG C, if being all unsatisfactory for, then compares each temperature value, output maximum temperature and minimum temperature；If certain or several temperature value are greater than 125 DEG C, or less than-40 DEG C, then export the thermally sensitive temperature sensor failure that this temperature value is corresponding, after removing this temperature value, carry out the comparison of all the other each temperature values, the maximum temperature of output residuals temperatures value and minimum temperature again。
Extreme temperatures or the extremely low power supply short circuit caused due to thermally sensitive temperature sensor is only detected by existing this fault diagnosis；Then cannot detecting for the micro-short circuit of ground or power supply for critesistor, this fault can cause thermal run away wrong report or heat management misoperation, and then causes that the life time decay of cell and vehicle performance decline。
Summary of the invention
It is an object of the invention to provide a kind of battery bag temperature sensing circuit method for diagnosing faults; by judge maximum temperature values and time difference of high temperature value in the temperature value of each temperature sensor, secondary low temperature value and lowest temperature angle value difference; determine that whether over the ground or power supply micro-short circuit temperature sensor and critesistor; to avoid thermal run away wrong report and heat management misoperation, and then the performance of the life-span of protection cell and car load。
To achieve these goals, the present invention provides following technical scheme:
A kind of battery bag temperature sensing circuit method for diagnosing faults, including:
Step S1: gather the temperature value of each temperature sensor, rejects the temperature value temperature value more than the first preset temperature or the temperature sensor less than the second preset temperature；
Step S2: compare the temperature value of all the other each temperature sensors, obtains maximum temperature value, secondary high temperature value, lowest temperature angle value and secondary low temperature value；
Step S3: if the difference of described maximum temperature value and the difference of described high temperature value, described low temperature value and described lowest temperature angle value is respectively less than the 3rd preset temperature, and the rate of temperature change of each described temperature sensor is less than default rate of change, then export described maximum temperature value and described lowest temperature angle value；
If described maximum temperature value is not less than the 3rd preset temperature with the difference of described high temperature value or the difference of described low temperature value and described lowest temperature angle value, or there is the rate of temperature change temperature sensor more than described default rate of change of temperature sensor, then report the unbalanced fault of temperature；
Wherein, described first preset temperature is temperature when described temperature sensor and power supply short circuit；Described second preset temperature is the temperature of described temperature sensor and ground short circuit, and described first preset temperature is more than described second preset temperature。
Preferably, described step S1 also includes:
Reject the rate of temperature change temperature value more than the temperature sensor of described default rate of change。
Preferably, described rejecting temperature value is more than the temperature value of the first preset temperature or the temperature sensor less than the second preset temperature, and described rejecting rate of temperature change includes more than the temperature value of the temperature sensor of described default rate of change:
Step S11: whether compare the temperature value of Current Temperatures sensor more than described first preset temperature；
Step S12: if the temperature value of described Current Temperatures sensor is not more than described first preset temperature, relatively whether the temperature of described Current Temperatures sensor is less than described second preset temperature；
If the temperature value of described Current Temperatures sensor is more than described first preset temperature, report described Current Temperatures sensor fault, and reject the temperature value of described Current Temperatures sensor, perform step S15；
Step S13: if the temperature value of described Current Temperatures sensor is not less than described second preset temperature, relatively whether the rate of temperature change of described Current Temperatures sensor is more than described default rate of change；
If the temperature value of described Current Temperatures sensor is less than described second preset temperature, report described Current Temperatures sensor fault, reject the temperature value of described Current Temperatures sensor, perform step S15；
Step S14: if the rate of temperature change of described Current Temperatures sensor is more than described default rate of change, report described Current Temperatures sensor fault, rejects the temperature value of described Current Temperatures sensor, performs step S15；
If the rate of temperature change of described Current Temperatures sensor is not more than described default rate of change, store the temperature value of described Current Temperatures sensor, perform step S15；
Step S15: judge whether described Current Temperatures sensor is last temperature sensor；
Step S16: if described Current Temperatures sensor is last temperature sensor, proceeds to step S2 and performs；
If described Current Temperatures sensor is not last temperature sensor, next temperature sensor is set to described Current Temperatures sensor, returns step S11 and perform。
Preferably, described step S3 includes:
Step S31: relatively whether described maximum temperature value and the difference of time high temperature value be less than described 3rd preset temperature；
Step S32: if the difference of described maximum temperature value and described high temperature value is less than described 3rd preset temperature, relatively whether the difference of described low temperature value and described lowest temperature angle value is less than described 3rd preset temperature；
If the difference of described maximum temperature value and described high temperature value is not less than described 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S33: if the difference of described low temperature value and described lowest temperature angle value is less than described 3rd preset temperature, perform step S34；
If the difference of described low temperature value and described lowest temperature angle value is not less than described 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S34: whether compare the rate of temperature change of each temperature sensor successively more than described default rate of change；
Step S35: if there is the rate of temperature change temperature sensor more than described default rate of change, then report the unbalanced fault of temperature；
If being absent from the rate of temperature change temperature sensor more than described default rate of change, then export described maximum temperature value and described lowest temperature angle value。
Preferably, described first preset temperature is 125 DEG C。
Preferably, described second preset temperature is-40 DEG C。
Preferably, described 3rd preset temperature is 5 DEG C。
Preferably, described default rate of change is 20 DEG C/s。
The beneficial effects of the present invention is:
First the present invention rejects irrational temperature sensor, make the temperature value of remaining temperature sensor all in normal value, namely no more than the first preset temperature and be not less than the second preset temperature, then the difference of maximum temperature value and time difference of high temperature value, secondary low temperature value and lowest temperature angle value is obtained, by the analysis to two differences, if secondary low temperature value is bigger with the difference of lowest temperature angle value, namely lowest temperature angle value is relatively big with the temperature value deviation of other temperature sensor, then be judged as temperature sensor micro short circuit ground or ground, crack road；If maximum temperature value is bigger with the difference of time high temperature value; namely maximum temperature value is bigger with the temperature value deviation of other temperature sensor; then it is judged as temperature sensor micro short circuit power supply or crack road power supply; thus avoid thermal run away wrong report and heat management misoperation, and then the performance of the life-span of protection cell and car load。
Accompanying drawing explanation
Fig. 1 is the flow chart of battery bag a kind of detailed description of the invention of temperature sensing circuit method for diagnosing faults provided by the present invention；
Fig. 2 is the flow chart of battery bag temperature sensing circuit method for diagnosing faults another kind detailed description of the invention provided by the present invention；
Fig. 3 is battery bag temperature sensing circuit method for diagnosing faults one detailed description of the invention system diagram provided by the present invention；
Fig. 4 is the circuit diagram of the battery bag temperature sensing circuit method for diagnosing faults single temperature sensor of a kind of detailed description of the invention provided by the present invention。
Accompanying drawing labelling:
In Figs. 1-4:
1, battery management system, NTC1, first temperature sensor, NTC2, second temperature sensor, NTC3, three-temperature sensor, NTC4, 4th temperature sensor, NTC5, 5th temperature sensor, NTC6, 6th temperature sensor, NTC7, 7th temperature sensor, NTC8, 8th temperature sensor, AN1, first temperature signal detection port, AN2, second temperature signal detection port, AN3, 3rd temperature signal detection port, AN4, 4th temperature signal detection port, AN5, 5th temperature signal detection port, AN6, 6th temperature signal detection port, AN7, 7th temperature signal detection port, AN8, 8th temperature signal detection port, RC2, second resistance, RC3, 3rd resistance, CC1, electric capacity, GND, ground, UC1, operational amplifier, TEMP_AD, temperature detection port。
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated。Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention。
Refer to Fig. 1-Fig. 2, in a kind of detailed description of the invention, a kind of battery bag temperature sensing circuit method for diagnosing faults provided by the present invention, it is characterised in that including:
Step S1: gather the temperature value of each temperature sensor, rejects the temperature value temperature value more than the first preset temperature or the temperature sensor less than the second preset temperature；
Step S2: compare the temperature value of all the other each temperature sensors, obtains maximum temperature value, secondary high temperature value, lowest temperature angle value and secondary low temperature value；
Step S3: if the difference of maximum temperature value and time difference of high temperature value, secondary low temperature value and lowest temperature angle value is respectively less than the 3rd preset temperature, and the rate of temperature change of each temperature sensor is less than default rate of change, then output maximum temperature value and lowest temperature angle value；
If maximum temperature value is not less than the 3rd preset temperature with the difference of time high temperature value or the difference of secondary low temperature value and lowest temperature angle value, or there is the rate of temperature change temperature sensor more than default rate of change of temperature sensor, namely the rate of temperature change that the difference of maximum temperature value and time high temperature value is not less than the 3rd preset temperature, the difference of secondary low temperature value and lowest temperature angle value is not less than the 3rd preset temperature, there is temperature sensor has one to meet more than the temperature sensor three of default rate of change, then report the unbalanced fault of temperature；
Wherein, the first preset temperature is temperature when described temperature sensor and power supply short circuit；Second preset temperature is the temperature of temperature sensor and ground short circuit, and the first preset temperature is more than the second preset temperature。
First above-described embodiment rejects irrational temperature sensor, make the temperature value of remaining temperature sensor all in normal value, namely no more than the first preset temperature and be not less than the second preset temperature, then the difference of maximum temperature value and time difference of high temperature value, secondary low temperature value and lowest temperature angle value is obtained, by the analysis to two differences, if secondary low temperature value is bigger with the difference of lowest temperature angle value, namely lowest temperature angle value is relatively big with the temperature value deviation of other temperature sensor, then be judged as temperature sensor micro short circuit ground or ground, crack road；If maximum temperature value is bigger with the difference of time high temperature value; namely maximum temperature value is bigger with the temperature value deviation of other temperature sensor; then it is judged as temperature sensor micro short circuit power supply or crack road power supply; thus avoid thermal run away wrong report and heat management misoperation, and then the performance of the life-span of protection cell and car load。
Wherein, temperature sensor is thermally sensitive temperature sensor。
Step S1 also includes:
Reject the rate of temperature change temperature value more than the temperature sensor of default rate of change。
During owing to not breaking down, the variations in temperature of single temperature sensor is less, therefore by above-mentioned flow process, namely can determine whether that whether the data of this temperature sensor are effective, to ensure the accuracy that consequent malfunction judges。
Reject the temperature value temperature value more than the first preset temperature or the temperature sensor less than the second preset temperature, and rejecting rate of temperature change include more than the temperature value of the temperature sensor of described default rate of change:
Step S11: whether compare the temperature value of Current Temperatures sensor more than described first preset temperature；
Whether step S12: if the temperature value of Current Temperatures sensor is not more than described first preset temperature, compare the temperature of Current Temperatures sensor less than the second preset temperature；
If the temperature value of Current Temperatures sensor is more than the first preset temperature, report Current Temperatures sensor fault, and reject the temperature value of Current Temperatures sensor, perform step S15；
Whether step S13: if the temperature value of Current Temperatures sensor is not less than described second preset temperature, compare the rate of temperature change of Current Temperatures sensor more than default rate of change；
If the temperature value of Current Temperatures sensor is less than the second preset temperature, report Current Temperatures sensor fault, reject the temperature value of Current Temperatures sensor, perform step S15；
Step S14: if the rate of temperature change of Current Temperatures sensor is more than default rate of change, reports Current Temperatures sensor fault, rejects the temperature value of Current Temperatures sensor, performs step S15；
If the rate of temperature change of Current Temperatures sensor is not more than default rate of change, the temperature value of storage Current Temperatures sensor, perform step S15；
Step S15: judge whether Current Temperatures sensor is last temperature sensor；
Step S16: if Current Temperatures sensor is last temperature sensor, proceeds to step S2 and performs；
If Current Temperatures sensor is not last temperature sensor, next temperature sensor is set to Current Temperatures sensor, returns step S11 and perform。
Judge whether temperature sensor exists fault one by one by this step, and each temperature sensor is sequentially carried out and the comparison of the first preset temperature, the second preset temperature and default rate of change, as long as the former is unsatisfactory for, then illustrate that this temperature sensor is broken down, directly remove its temperature value, and do not carry out follow-up judgement, save program successively, save the time of whole determining program。The comparison of above-mentioned three can also be all carried out certainly for each temperature sensor。
Reject the temperature value temperature value more than the first preset temperature or the temperature sensor less than the second preset temperature, after rejecting the rate of temperature change temperature value more than the temperature sensor of described default rate of change, effective temperature value is n, adopts conventional algorithm to obtain maximum temperature value, secondary high temperature value, lowest temperature angle value and secondary low temperature value。
Step S3 includes:
Step S31: whether compare the maximum temperature value difference with time high temperature value less than the 3rd preset temperature；
Step S32: if the difference of maximum temperature value and time high temperature value is less than the 3rd preset temperature, relatively whether time low temperature value and the difference of lowest temperature angle value be less than the 3rd preset temperature；
If the difference of maximum temperature value and time high temperature value is not less than the 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S33: if the difference of secondary low temperature value and lowest temperature angle value is less than the 3rd preset temperature, perform step S34；
If the difference of secondary low temperature value and lowest temperature angle value is not less than the 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S34: whether compare the rate of temperature change of each temperature sensor successively more than default rate of change；
Step S35: if there is the rate of temperature change temperature sensor more than default rate of change, then report the unbalanced fault of temperature；
If being absent from the rate of temperature change temperature sensor more than default rate of change, then output maximum temperature value and lowest temperature angle value。
The program of breakdown judge can be saved further by this step。
First preset temperature is 125 DEG C。Obtaining by testing, this temperature value can be better protected from occurring that the gathering line of temperature sensor has the state being shorted to power supply to occur。
Second preset temperature is-40 DEG C。Obtaining by testing, this temperature value can be better protected from occurring that the gathering line of temperature sensor has the state being shorted to ground to occur。
3rd preset temperature is 5 DEG C。By Experimental Calibration, this numerical value is better protected from occurring that the gathering line of temperature sensor has the state being shorted to power supply or ground to occur。
Default rate of change is 20 DEG C/s。By Experimental Calibration, this numerical value is better protected from occurring that the gathering line of temperature sensor has the state being shorted to power supply or ground to occur。
With reference to Fig. 3, battery bag temperature sensing circuit includes battery management system 1, battery management system 1 is provided with temperature signal detection mouth, as the first temperature signal detects port AN1, the second temperature signal detection port AN2, the 3rd temperature signal detection port AN3, the 4th temperature signal detection port AN4, the 5th temperature signal detection port AN5, the 6th temperature signal detection port AN6, the 7th temperature signal detection port AN7, the 8th temperature signal detection port AN8；Each temperature signal detection mouth connects a thermally sensitive temperature sensor, the first temperature sensor NTC1 is connected as the first temperature signal detects port AN1, second temperature signal detection port AN2 connects the second temperature sensor NTC2, 3rd temperature signal detection port AN3 connects three-temperature sensor NTC3, 4th temperature signal detection port AN4 connects the 4th temperature sensor NTC4, 5th temperature signal detection port AN5 connects the 5th temperature sensor NTC5, 6th temperature signal detection port AN6 connects the 6th temperature sensor NTC6, its temperature signal detection port AN7 connects the 7th temperature sensor NTC7, 8th temperature signal detection port AN8 connects the 8th temperature sensor NTC8；The circuit diagram of each thermally sensitive temperature sensor and battery management system 1, with reference to Fig. 4, it is the testing circuit figure of the first temperature sensor NTC1: battery management system 1 provides the power supply of a 5VREF, it is connected to one end of the first temperature sensor NTC1, the other end of the first temperature sensor NTC1 and one end of the 3rd resistance RC3 connect, the other end ground connection GND of the 3rd resistance RC3, with the first temperature sensor NTC1 to power supply 5VREF dividing potential drop。3rd resistance RC3 is parallel with the RC filter circuit that the second resistance RC2 and electric capacity CC1 are constituted, and the fabric swatch area for preventing circuit board is excessive or the long impact that feedback signal is caused。Once brother's circuit also increased the operational amplifier UC1 voltage follower circuit constituted, and its outfan is connected to temperature detection port TEMP_AD。
Although the present invention is described in conjunction with above example, but the present invention is not limited to above-described embodiment, and it being only limited by the restriction of claim, it easily can be modified and change by those of ordinary skill in the art, but and without departing from the essential idea of the present invention and scope。
Claims (8)
1. a battery bag temperature sensing circuit method for diagnosing faults, it is characterised in that including:
Step S1: gather the temperature value of each temperature sensor, rejects the temperature value temperature value more than the first preset temperature or the temperature sensor less than the second preset temperature；
Step S2: compare the temperature value of all the other each temperature sensors, obtains maximum temperature value, secondary high temperature value, lowest temperature angle value and secondary low temperature value；
Step S3: if the difference of described maximum temperature value and the difference of described high temperature value, described low temperature value and described lowest temperature angle value is respectively less than the 3rd preset temperature, and the rate of temperature change of each described temperature sensor is less than default rate of change, then export described maximum temperature value and described lowest temperature angle value；
If described maximum temperature value is not less than the 3rd preset temperature with the difference of described high temperature value or the difference of described low temperature value and described lowest temperature angle value, or there is the rate of temperature change temperature sensor more than described default rate of change of temperature sensor, then report the unbalanced fault of temperature；
Wherein, described first preset temperature is temperature when described temperature sensor and power supply short circuit；Described second preset temperature is the temperature of described temperature sensor and ground short circuit, and described first preset temperature is more than described second preset temperature。
2. battery bag temperature sensing circuit method for diagnosing faults according to claim 1, it is characterised in that described step S1 also includes:
Reject the rate of temperature change temperature value more than the temperature sensor of described default rate of change。
3. battery bag temperature sensing circuit method for diagnosing faults according to claim 2, it is characterized in that, described rejecting temperature value is more than the temperature value of the first preset temperature or the temperature sensor less than the second preset temperature, and described rejecting rate of temperature change includes more than the temperature value of the temperature sensor of described default rate of change:
Step S11: whether compare the temperature value of Current Temperatures sensor more than described first preset temperature；
Step S12: if the temperature value of described Current Temperatures sensor is not more than described first preset temperature, relatively whether the temperature of described Current Temperatures sensor is less than described second preset temperature；
If the temperature value of described Current Temperatures sensor is more than described first preset temperature, report described Current Temperatures sensor fault, and reject the temperature value of described Current Temperatures sensor, perform step S15；
Step S13: if the temperature value of described Current Temperatures sensor is not less than described second preset temperature, relatively whether the rate of temperature change of described Current Temperatures sensor is more than described default rate of change；
If the temperature value of described Current Temperatures sensor is less than described second preset temperature, report described Current Temperatures sensor fault, reject the temperature value of described Current Temperatures sensor, perform step S15；
Step S14: if the rate of temperature change of described Current Temperatures sensor is more than described default rate of change, report described Current Temperatures sensor fault, rejects the temperature value of described Current Temperatures sensor, performs step S15；
If the rate of temperature change of described Current Temperatures sensor is not more than described default rate of change, store the temperature value of described Current Temperatures sensor, perform step S15；
Step S15: judge whether described Current Temperatures sensor is last temperature sensor；
Step S16: if described Current Temperatures sensor is last temperature sensor, proceeds to step S2 and performs；
If described Current Temperatures sensor is not last temperature sensor, next temperature sensor is set to described Current Temperatures sensor, returns step S11 and perform。
4. battery bag temperature sensing circuit method for diagnosing faults according to claim 2, it is characterised in that described step S3 includes:
Step S31: relatively whether described maximum temperature value and the difference of time high temperature value be less than described 3rd preset temperature；
Step S32: if the difference of described maximum temperature value and described high temperature value is less than described 3rd preset temperature, relatively whether the difference of described low temperature value and described lowest temperature angle value is less than described 3rd preset temperature；
If the difference of described maximum temperature value and described high temperature value is not less than described 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S33: if the difference of described low temperature value and described lowest temperature angle value is less than described 3rd preset temperature, perform step S34；
If the difference of described low temperature value and described lowest temperature angle value is not less than described 3rd preset temperature, report the unbalanced fault of temperature, perform step S34；
Step S34: whether compare the rate of temperature change of each temperature sensor successively more than described default rate of change；
Step S35: if there is the rate of temperature change temperature sensor more than described default rate of change, then report the unbalanced fault of temperature；
If being absent from the rate of temperature change temperature sensor more than described default rate of change, then export described maximum temperature value and described lowest temperature angle value。
5. battery bag temperature sensing circuit method for diagnosing faults according to claim 1, it is characterised in that described first preset temperature is 125 DEG C。
6. battery bag temperature sensing circuit method for diagnosing faults according to claim 1, it is characterised in that described second preset temperature is-40 DEG C。
7. battery bag temperature sensing circuit method for diagnosing faults according to claim 1, it is characterised in that described 3rd preset temperature is 5 DEG C。
8. battery bag temperature sensing circuit method for diagnosing faults according to claim 1, it is characterised in that described default rate of change is 20 DEG C/s。
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