CN102332616B - Diagnosis and control method for power battery management system - Google Patents
Diagnosis and control method for power battery management system Download PDFInfo
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 11
- 239000011449 brick Substances 0.000 claims description 10
- 238000002405 diagnostic procedure Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 238000004092 self-diagnosis Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
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- 238000002955 isolation Methods 0.000 description 2
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a diagnosis and control method for a power battery management system (BMS). The BMS performs self-diagnosis and self-control, namely diagnosis and processing for own faults; and the BMS performs diagnosis and control on a power battery, namely diagnosis for the safety of the battery, diagnosis for a voltage sampling fault, diagnosis for a current sensor or circuit damage, diagnosis for a temperature sampling fault, diagnosis for a controller area network (CAN) communication fault, processing for startup sequence, diagnosis for a contactor fault and diagnosis and processing for battery state information.
Description
Technical field
The present invention relates to a kind of power battery management system (BMS), especially the dependent diagnostic work of the power battery management system such as pure electric automobile, hybrid vehicle, plug-in hybrid-power automobile, is specifically related to a kind of diagnosis control method of power battery management system.
Background technology
Electrokinetic cell is as new industry, have broad application prospects, its application extensively with reliable, safety, advanced management technology is inseparable, again because the popularity rate of current electric automobile is not very high, along with environmental protection cry is more and more higher, electric automobile has wide market prospects, and electrokinetic cell administrative skill is as a core technology, not only in hybrid electric vehicle, on pure electric vehicle, there is extensive use, and there is equally very large market potential in other electrokinetic cell industry, the diagnostic function of management system is not also very perfect at present, can not ensure validity and the fail safe of system.
The power of electric automobile is from electrokinetic cell, and the management of electrokinetic cell becomes one of technology most crucial on electric automobile.Battery management system is mainly the monitoring to the various states of battery, improves battery and efficiency, meets car load dynamic property and Eco-power requirement, makes battery provide in the best condition energy, car load to obtain satisfied result of use.In order to ensure high security and the validity of power battery management system, research and development diagnostic function strategy is absolutely necessary, has the work of practical significance.
Summary of the invention
The object of the present invention is to provide a kind of diagnosis control method of power battery management system, improve battery management system diagnostic function, ensure the safe and effective operation of system.
Battery management system BMS diagnoses the fault that self may exist, fail safe, voltage sample failure diagnosis, temperature sampling failure diagnosis, the diagnosis of CAN communication failure, starting up's sequential processes, contactor failure diagnosis, battery status information diagnostic process, realize the elaboration to battery management system diagnosis by above several aspects, adopt V-type development mode to realize whole Embedded exploitation.
Concrete technical scheme is as follows:
A diagnosis control method for power battery management system, battery management system BMS diagnoses self and controls, and comprises diagnosis and processing to faults itself; Battery management system BMS diagnoses electrokinetic cell and controls, and comprises battery security diagnosis, voltage sample failure diagnosis, current sensor or loop damage diagnosis, temperature sampling failure diagnosis, the diagnosis of CAN communication failure, starting up's sequential processes, contactor failure diagnosis and battery status information diagnostic process.
Further, described diagnosis control specifically adopts following means by battery management system BMS: the embedded software of battery management system BMS comprises upper application software and bottom software, this upper application software comprises control logic and strategy, use Matlab/Simulink exploitation upper strata to control model, automatically generate C code; Bottom software comprises bottom layer driving software and communications protocol and supports the software of other corresponding function, and upper layer software (applications) and bottom layer driving software interface adopt global variable mode, realize two-way I/O, and this diagnostic work that jointly cooperated.
Further, in described battery security diagnosis, voltage, the temperature of battery management system BMS to each batteries in power brick monitored, simultaneously the reliability of the brace between electric current, voltage, internal resistance, electric leakage, immersion, collision and the cell of monitoring battery bag
Further, in described voltage sample failure diagnosis, battery management system BMS compares sampled value and threshold values within the sampling period, judges fault; Or through super-high-current, the situation of change of more each sampling channel magnitude of voltage is diagnosed.
Further, described current sensor or loop are damaged in failure diagnosis, adopt following steps:
(1) judge the validity of electric current: determine this moment for charge and discharge condition and sampling threshold values etc. whether electric current is effective;
(2) in the time that car load is started to walk according to change in voltage, record now stagnation pressure;
(3) find in starting-up process voltage low valley point;
(4) when the maximum of the electric current absolute value in step (3) is no more than definite value;
(5) judge current circuit fault.
Further, in described temperature sampling failure diagnosis diagnosis, adopt following steps:
(1), according to battery behavior, mean temperature above freezing and the subzero mean temperature of mean temperature is set;
(2) battery management system BMS judges that turn-on temperature is whether within normal sample range;
(3) the battery management system BMS upper sampled value of judgement and next sampled value gap;
(4) battery management system BMS reports and safeguards that prompting and warning message, warning message are divided into I level and II level is reported to the police according to concrete fault;
(5) battery management system BMS power-limiting in the time of I level;
(6) disconnecting high pressure in II level alarm protects.
Further, in the diagnosis of described CAN communication failure, adopt following steps: in the time there is CAN broken string, or while there is CAN packet loss phenomenon, battery management system BMS confirms as CAN communication failure, requires to do disconnect high voltage protective and process;
Wherein CAN broken string comprises: without counter CAN message, within 10 message cycles, do not receive association message, or, there is counter CAN message, association message is in 500ms, and Counter Value remains unchanged;
Wherein CAN packet loss phenomenon comprises: with the message packet loss of car load communication, and with charger communication information packet loss.
Further, described contactor failure diagnosis concrete steps are: when battery management system has positive relay, negative relay, preliminary filling relay, before relay is all not closed, intersect and gather power brick both end voltage Uab, Ucd, when Uab, Ucd exceed definite value, judge that so relay has sticky dead phenomenon, when preliminary filling completes, it is closure state that positive relay drives instruction, and without other faults, relay does not respond, discharge loop can not be closed, judge that relay is uncontrolled, now battery management system BMS sends relay fault information.
Compared with currently available technology, the present invention, by succinct feasible control strategy, realizes diagnosis and battery status diagnosis to battery management system itself.The dependent diagnostic strategy comparatively comprehensively system being done, comprises fail safe, voltage sample failure diagnosis, temperature sampling failure diagnosis, the diagnosis of CAN communication failure, starting up's sequential processes, contactor failure diagnosis, battery status information diagnostic process.Make battery provide in the best condition energy, car load to obtain satisfied result of use.Ensure high security and the validity of power battery management system.
Brief description of the drawings
Fig. 1 is contactor Fault Diagnosis Strategy schematic diagram
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
The Diagnostic Strategy of the power battery management system that the present embodiment relates to, is mainly divided into two classes: being the dependent diagnostic of battery management system itself on the one hand, is the diagnosis for electrokinetic cell state on the other hand.
(1) fail safe
Voltage, the temperature of each batteries of system to power brick are all monitored, and the reliability of the brace between the electric current to power brick, voltage, internal resistance, electric leakage, immersion, collision and cell simultaneously, have reliably monitoring.Generally all there is the potential hazard of curtage in electric automobile.Under normal operating condition, use the measure such as the physical isolation such as insulated wire, insulation resistance can obtain safe high-tension electricity isolation.At some in particular cases, also can there is the problem that electric insulation lost efficacy, therefore, the device that we need to provide some diagnosing insulations to lose efficacy.For example adopt the safeguard measures such as high-tension electricity cuts off automatically, manually cut-out, interlock system, special tool(s), ground connection can reach the object of high-tension electricity protection.Adopt high-voltage safety standard by following necessity:
1 driver and crew's life security
The safety of 2 high-pressure system parts
The safety of 3 battery bodies
4 meet the necessity of high voltage standard
For better ensureing the fail safe of high-pressure system, the following control strategy of main consideration at present:
consider the disconnection strategy of each energy source device working limit
(2) sampling Diagnostic Strategy
First to judge the validity of electric current, determine for charge and discharge condition and sampling threshold values etc. whether electric current is effective this moment.Secondly in the time that car load is started to walk, have larger variation according to voltage, beginning voltage is more steady, records now stagnation pressure, find in starting-up process, and voltage low valley point, if electric current absolute value maximum is no more than certain value in this process, current circuit fault.(need do vehicle test and obtain Diagnostic parameters)
(3) temperature sampling Fault Diagnosis Strategy:
According to battery behavior, conventionally charge and discharge are above freezing and subzeroly have different requirements.So temperature is can be according to mean temperature above freezing and subzeroly consider.Turn-on temperature whether within normal sample range, a upper sampled value and next sampled value gap.Temperature rise is too high considers the judgement of catching fire.
BMS processes:
A, the concrete fault of basis report safeguards that prompting and warning message, warning message are divided into I level and II level is reported to the police;
B, I level power-limiting;
C, the warning of II level disconnect high pressure and protect;
(3) CAN communication failure Diagnostic Strategy:
Be divided into CAN broken string and packet loss phenomenon
B, have counter CAN message, association message is in 500ms, and Counter Value remains unchanged; According to message
Important level is selected proper parameter.
BMS processes:
One of above two kinds of phenomenons are set up, and confirm as CAN communication failure, require to do the processing of disconnection high voltage protective.
(4) starting up's sequential processes strategy:
Starting up's step is: initialization-> System self-test-> wait command.
Initialization order is: chip internal module initialization-> peripheral module initialization-> RAM data initialization.
System self-test order is: EEPROM diagnosis-> sampling module diagnosis-> Communication diagnostic.
System initialization is complete, and System self-test passes through, and waits for and discharges and recharges order, otherwise carry out corresponding conservation treatment.
Before system does not start completely, require not respond extraneous any order.
(5) contactor Fault Diagnosis Strategy:
Be divided into the sticky dead b of two classes: a, relay, relay is uncontrolled
Having positive relay, negative relay, preliminary filling relay according to current system is example explanation, sees Fig. 1:
A, as shown in the figure, before relay is not closed, intersects and gathers power brick both end voltage Uab, Ucd
If b now Uab, Ucd exceedes certain value, relay has sticky dead phenomenon so.
C, preliminary filling complete, and it is closure state that positive relay drives instruction, and without other faults, relay does not respond, and discharge loop can not be closed, and relay is uncontrolled
Send relay fault information, car load can not READY.
(6) battery status information diagnostic process strategy:
The state information of battery own is very important reference quantity, generally include overcurrent, module is under-voltage, stagnation pressure is under-voltage, module overvoltage, stagnation pressure overvoltage, module excess temperature, inclusion excess temperature, module low temperature, inclusion low temperature, power brick dump energy (SOC), power brick health index, humidity, consensus information etc.According to the characteristic of different batteries, power brick is done to condition diagnosing processing.
Result is pressed to different stage and divide, take different disposal measure.Mainly be divided into three ranks: I level information, II level warning message, III level disconnects high voltage protective battery.
BMS software comprises upper application software and bottom software, and upper application software comprises control logic and strategy, uses Matlab/Simulink exploitation upper strata to control model, automatically generates C code; Bottom software comprises the software of other functions of support such as bottom layer driving software and communications protocol.Upper layer software (applications) and bottom layer driving software interface adopt global variable mode, realize two-way I/O.By both this diagnostic works that jointly cooperated.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (3)
1. a diagnosis control method for power battery management system, is characterized in that, battery management system BMS diagnoses self and controls, and comprises diagnosis and processing to faults itself, battery management system BMS diagnoses electrokinetic cell and controls, comprise battery security diagnosis, voltage sample failure diagnosis, diagnosis is damaged in current sensor or loop, temperature sampling failure diagnosis, the diagnosis of CAN communication failure, starting up's sequential processes, contactor failure diagnosis and battery status information diagnostic process, described contactor failure diagnosis concrete steps are: when battery management system has positive relay, negative relay, preliminary filling relay, before relay is all not closed, intersect and gather power brick both end voltage Uab, Ucd, work as Uab, Ucd exceedes definite value, judge that so relay has sticky dead phenomenon, when preliminary filling completes, it is closure state that positive relay drives instruction, and without other faults, relay does not respond, be that discharge loop can not be closed, judge that relay is uncontrolled, now battery management system BMS sends relay fault information.
2. the diagnosis control method of power battery management system as claimed in claim 1, it is characterized in that, described diagnosis and control specifically adopt following means by battery management system BMS: the embedded software of battery management system BMS comprises upper application software and bottom software, this upper application software comprises control logic and strategy, use Matlab/Simulink exploitation upper strata to control model, automatically generate C code; Bottom software comprises bottom layer driving software and communications protocol and supports the software of other corresponding function, and upper layer software (applications) and bottom layer driving software interface adopt global variable mode, realize two-way I/O, and this diagnostic work that jointly cooperated.
3. the diagnosis control method of power battery management system as claimed in claim 1 or 2, it is characterized in that, in described battery security diagnosis, voltage, the temperature of battery management system BMS to each batteries in power brick monitored, simultaneously the reliability of the brace between electric current, voltage, internal resistance, electric leakage, immersion, collision and the cell of monitoring battery bag.
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Owner name: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SAIC CHERY AUTOMOBILE CO., LTD. Effective date: 20141230 |
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Effective date of registration: 20141230 Address after: 241009 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. Effective date of registration: 20141230 Address after: 241009 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. |
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Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Patentee after: Chery New Energy Automobile Co.,Ltd. Address before: 241009 no.226, South Huajin Road, Yijiang District, Wuhu City, Anhui Province Patentee before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |