CN116834606B - Processing method for monomer voltage during AFE monomer acquisition disconnection - Google Patents
Processing method for monomer voltage during AFE monomer acquisition disconnection Download PDFInfo
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- CN116834606B CN116834606B CN202310997643.7A CN202310997643A CN116834606B CN 116834606 B CN116834606 B CN 116834606B CN 202310997643 A CN202310997643 A CN 202310997643A CN 116834606 B CN116834606 B CN 116834606B
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- 239000000178 monomer Substances 0.000 title claims abstract description 130
- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 230000002159 abnormal effect Effects 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000003745 diagnosis Methods 0.000 claims description 21
- 230000005856 abnormality Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007488 abnormal function Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the field of new energy automobile battery management systems, and particularly relates to a processing method applied to the cell voltage when an AFE cell is acquired and disconnected, wherein the cell voltage values of the current period and the last acquisition period are acquired, and an average voltage value effectively acquired by all cells and a difference value between each cell voltage value and the average voltage value are generated in the AFE; preferentially judging whether the number of the effective monomer voltages meets a preset value, if so, terminating the processing flow, otherwise, further judging whether the effective voltage value of each section of monomer meets a preset screening interval, and recording the monomer voltage numbers of the effective monomers meeting the interval so as to identify the abnormal monomer positions according to the numbers; according to the AFE practical application scene, the abnormal value is acquired by pointedly processing the monomer voltage in the abnormal and fault unacknowledged process, and the effective monomer voltage at the forward moment is used for replacing the abnormal voltage acquired in real time in the process.
Description
Technical Field
The invention belongs to the field of new energy automobile battery management systems, and particularly relates to a processing method of monomer voltage when an AFE monomer is used for collecting and breaking wires.
Background
The cell voltage acquisition function of the battery management system is based on a battery sampling chip (AFE), and the cell voltage directly affects important parameter estimation such as SOC (state of charge) of the vehicle, SOE (battery remaining energy), SOP (power state of battery) and the like, and related fault diagnosis of the battery.
In the prior art, when the single voltage is acquired based on the battery sampling chip, if a certain sampling line is in a disconnected state, at this time, the upper and lower battery cores of the sampling line are divided by the equivalent resistor Ri in the AFE, an invalid voltage value is acquired, and if the abnormal voltage value is used as a real voltage, a certain probability exists to cause calculation errors of relevant parameters of SOX (SOC, SOE, SOP), misdiagnosis of overcharge or overdischarge faults of the power-off core, and the like.
The method for detecting broken wires by AFE manufacturers in the current market can be roughly divided into two types: a current source method and a resistor voltage division method. However, in any detection method, in practical application, a broken line fault diagnosis function is added in a gap in a monomer acquisition process, and multiple redundancy judgment is added to prevent misdiagnosis of a broken line fault, so that a long time for confirming the broken line fault diagnosis is caused (a certain difference exists between different BMS manufacturers, and the time is generally different from hundreds of milliseconds to seconds). In this process, if an effective processing mode is lacking, the collected invalid voltage still has probability of causing abnormal functions of the vehicle.
Disclosure of Invention
The invention aims to provide a processing method of monomer voltage applied to AFE monomer acquisition and disconnection, which solves the problems in the background technology.
The invention realizes the above purpose through the following technical scheme:
a processing method applied to the single voltage when the AFE single body collects the broken line is applied to the processing of the voltage sampling value abnormality in the process of executing the broken line diagnosis in a battery management system, and the processing method comprises the following steps:
s1: the battery management system collects the voltage values of all the monomers in the current period and the last collecting period, and generates an average voltage value effectively collected by all the monomers and a difference value between the voltage value of each section of the monomers and the average voltage value in the AFE; preferentially judging whether the number of the effective monomer voltages meets a preset value, if so, terminating the processing flow, otherwise, further judging whether the effective voltage value of each section of monomer meets a preset screening interval, and recording the monomer voltage numbers of the effective monomers meeting the interval so as to identify the abnormal monomer positions according to the numbers;
s2: repeatedly executing the step S1 until the number of the effective monomers in the AFE is greater than two, and generating an abnormal monomer value of a substitute mark according to the effective monomer voltage of the current period, the current monomer voltage of the previous period and the difference value between the current effective monomer voltage and the average voltage; otherwise, using the effective monomer voltage value before abnormality to replace the marked abnormal monomer value;
s3: after the battery management system executes continuous disconnection diagnosis for a plurality of times, when the abnormal single body generated in the step S2 meets the disconnection fault condition, setting the single body to acquire a disconnection fault flag bit as effective, and using an ineffective value as the voltage value of the abnormal single body; otherwise, the marked monomer number is cleared, and the current acquired value is used as the monomer voltage value.
In the step S1, all effective voltages in the AFE are identified according to the single voltage acquisition configuration and the acquisition disconnection fault sign in the AFE, and if the number of the effective single voltages is less than or equal to 5, the number of the effective voltages is considered to be too small and is not processed.
A further improvement is that in step S1, the preset screening interval is:
the V-V is greater than Vk and V-V is less than Vk/2;
wherein Vm is the monomer voltage value collected in the current period of the AFE, vn is the monomer voltage value collected in the previous collection period, va is the average voltage value of all effective monomer voltages in the current collection period, vl is the average voltage value of all collected effective monomer voltages of the AFE, and Vk is a set voltage threshold.
In the further improvement, in step S2, if at least one abnormal monomer exists when step S1 is repeatedly executed, the frequency of diagnosing the disconnection fault is increased, the monomer voltage value Vn of the previous acquisition period is not updated, and the acquired voltage value Vm of the current period is updated to the monomer voltage value Vn of the previous acquisition period.
In the further improvement, in step S2, if the number of effective monomers is greater than 2, vm=va+vd, where Vd is the difference between the current effective monomer and the average voltage; if the number of effective monomer voltages is less than or equal to 2, the effective monomer voltage value before abnormality is used for replacing the marked abnormal monomer value, namely vn=vm.
The invention has the beneficial effects that:
according to the AFE practical application scene, when partial original acquired voltage is abnormal, the invention immediately and continuously starts multiple times of disconnection diagnosis, optimizes the problem of overlong time of conventional disconnection diagnosis, pertinently processes the abnormal value acquired by the single voltage in the abnormal and fault unacknowledged process, and replaces the abnormal voltage acquired in real time in the process by using the effective single voltage at the advancing moment;
according to the invention, the possible voltage dynamic change in the disconnection diagnosis process is fully considered, the substitution value is calculated according to the AEF acquisition voltage distribution rule, and the consistency of the single voltage during the dynamic change is ensured;
the invention can effectively avoid the voltage acquisition problem caused by loosening problems of connectors, wire harnesses and the like in practical application, effectively improves the accuracy and the reliability of single voltage acquisition and reduces the probability of error calculation of important parameters (SOX, equalization and the like) related to single voltage intensity on the premise of not changing hardware;
the invention aims at the small time that the AFE diagnosis strategy is not determined to be abnormal in the use scene of the actual broken line of the AFE, and the influence caused by the abnormal acquisition value is avoided by using a reasonable strategy in the small time.
Drawings
FIG. 1 is a flow chart of the execution of the processing method in the present invention.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, wherein it is to be understood that the following detailed description is for the purpose of illustration only and is not to be construed as limiting the scope of the invention, as various insubstantial modifications and adaptations of the invention to those skilled in the art may be made in light of the foregoing disclosure.
Example 1
As shown in fig. 1, the present embodiment proposes a processing method of a single voltage applied to an AFE single unit when collecting and breaking, which is applied to a process of executing an abnormality of a voltage sampling value in a broken line diagnosis process in a battery management system, and the processing method includes:
s1: the battery management system collects the voltage values of all the monomers in the current period and the last collecting period, and generates an average voltage value effectively collected by all the monomers and a difference value between the voltage value of each section of the monomers and the average voltage value in the AFE; preferentially judging whether the number of the effective monomer voltages meets a preset value, if so, terminating the processing flow, otherwise, further judging whether the effective voltage value of each section of monomer meets a preset screening interval, and recording the monomer voltage numbers of the effective monomers meeting the interval so as to identify the abnormal monomer positions according to the numbers;
the preset screening interval is as follows:
the V-V is greater than Vk and V-V is less than Vk/2;
wherein Vm is the monomer voltage value collected in the current period of the AFE, vn is the monomer voltage value collected in the previous collection period, va is the average voltage value of all effective monomer voltages in the current collection period, vl is the average voltage value of all collected effective monomer voltages of the AFE, and Vk is a set voltage threshold.
S2: repeatedly executing the step S1 until the number of the effective monomers in the AFE is greater than two, and generating an abnormal monomer value of a substitute mark according to the effective monomer voltage of the current period, the current monomer voltage of the previous period and the difference value between the current effective monomer voltage and the average voltage; otherwise, using the effective monomer voltage value before abnormality to replace the marked abnormal monomer value;
s3: after the battery management system executes continuous disconnection diagnosis for a plurality of times, when the abnormal single body generated in the step S2 meets the disconnection fault condition, setting the single body to acquire a disconnection fault flag bit as effective, and using an ineffective value as the voltage value of the abnormal single body; otherwise, the marked monomer number is cleared, and the current acquired value is used as the monomer voltage value.
Preferably, in step S1, all effective voltages in the AFE are identified according to the configuration of the acquisition of the monomer voltages in the AFE and the acquisition of the disconnection fault sign, and if the number of the effective monomer voltages is less than or equal to 5, the number of the effective voltages is considered to be too small, and the processing is not performed.
Preferably, in step S2, if at least one abnormal cell exists when step S1 is repeatedly executed, the frequency of diagnosing the disconnection fault is increased, the cell voltage value Vn of the previous acquisition period is not updated, and the cell voltage value Vm of the current period is updated to the cell voltage value Vn of the previous acquisition period.
Preferably, in step S2, if the number of effective monomers is greater than 2, vm=va+vd, where Vd is the difference between the current effective monomer and the average voltage; if the number of effective monomer voltages is less than or equal to 2, the effective monomer voltage value before abnormality is used for replacing the marked abnormal monomer value, namely vn=vm.
The voltage change trend is not used as a sampling abnormal fault diagnosis, but because the fault diagnosis principle of the AFE in the use process has a gray time period in the actual use process, namely the acquired value is abnormal, but the diagnosis result is not determined to be abnormal, and if no proper strategy is adopted in the gray time period to avoid the acquisition of the abnormal value, a worse result is possibly caused; the application is aimed at the use scene: in the small period of time when the line is actually broken but the AFE diagnosis strategy is not determined to be abnormal, the influence caused by the abnormal acquisition value is avoided by using a reasonable strategy in the small period of time, and the method is different from the method aiming at the full period of AFE acquisition in the prior art, and the method is used for reasonably judging the confirmed hardware abnormality or the acquired value completely.
The abnormality diagnosis is that the AFE collects the relation of external hardware circuits (mainly filter capacitors), the voltage slowly drops in the abnormal triggering and failure unacknowledged process, and if the voltage value in the dropping process is not processed and directly used, the voltage value can have a larger influence on part of functions of the BMS.
In this embodiment, the present invention is applicable to a variety of applications. The processing method for the monomer voltage is divided into the following three processes:
1. and (5) identifying abnormal monomer positions.
The monomer voltage of the current acquisition period of the AFE is marked as Vm, the monomer voltage acquired in the previous acquisition period is marked as Vn, the average voltage of all effective acquisition voltages of the AFE is marked as Vl, and the difference between each section of monomer voltage and the average voltage is marked as Vd;
b. identifying all effective voltages in the AFE according to the single voltage acquisition configuration and the acquisition broken line fault sign in the AFE, and if the number of the effective single voltages is less than or equal to 5, considering that the number of the effective voltages is too small, and not processing; otherwise, judging whether each section of effective voltage meets the following conditions;
the V-V is greater than Vk and V-V is less than Vk/2;
c. b, after the judgment condition in the step b is met, recording the monomer voltage number;
d. counting the number of the recorded numbered monomers in the AFE, if the number is more than or equal to 1, improving the diagnosis frequency of the disconnection fault, and not updating the voltage value Vn of the monomer in the last acquisition period; otherwise, the single voltage value Vn of the previous acquisition period is updated by using the voltage value Vm acquired in the current period.
2. Abnormal cell voltage value substitution
Obtaining the obtained number of effective monomers and abnormal monomer numbers, if the number of the effective monomer voltages is more than 2, recalculating an average monomer voltage value Va in the AFE according to all the effective monomer voltages, and replacing marked abnormal monomer values by using the difference value between the effective monomer average voltage in the current period and the current voltage in the last period and the effective average monomer voltage, namely vm=Va+Vd; if the number of effective monomer voltages is less than or equal to 2, the effective monomer voltage value before abnormality is used for replacing the marked abnormal monomer value, namely vn=vm.
3. Broken line fault diagnosis
After the continuous disconnection diagnosis is finished, if the monomer with the marked number has disconnection fault, updating the monomer to acquire a disconnection fault flag bit, and using an invalid value as a monomer voltage value; otherwise, the marked monomer number is cleared, and the current acquisition value is used as the monomer voltage value.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (2)
1. The utility model provides a processing method that is applied to the monomer voltage when AFE monomer gathers the broken wire, is applied to the processing that carries out the voltage sampling value in the diagnosis process of broken wire in the battery management system and unusual, its characterized in that: the processing method comprises the following steps:
s1: the battery management system collects the voltage values of all the monomers in the current period and the last collecting period, and generates an average voltage value effectively collected by all the monomers and a difference value between the voltage value of each section of the monomers and the average voltage value in the AFE; preferentially judging whether the number of the effective monomer voltages meets a preset value, if so, terminating the processing flow, otherwise, further judging whether the effective voltage value of each section of monomer meets a preset screening interval, and recording the monomer voltage numbers of the effective monomers meeting the interval so as to identify the abnormal monomer positions according to the numbers;
s2: repeatedly executing the step S1 until the number of the effective monomers in the AFE is greater than two, and generating an abnormal monomer value of a substitute mark according to the effective monomer voltage of the current period, the current monomer voltage of the previous period and the difference value between the current effective monomer voltage and the average voltage; otherwise, using the effective monomer voltage value before abnormality to replace the marked abnormal monomer value;
s3: after the battery management system executes continuous disconnection diagnosis for a plurality of times, when the abnormal single body generated in the step S2 meets the disconnection fault condition, setting the single body acquisition disconnection fault flag bit as effective, and using an ineffective value as an abnormal single body voltage value; otherwise, eliminating the marked monomer number, and using the current acquisition value as a monomer voltage value;
in step S1, the preset screening interval is:
the V-V is greater than Vk and V-V is less than Vk/2;
wherein Vm is a monomer voltage value acquired in the current period of the AFE, vn is a monomer voltage value acquired in the previous acquisition period, va is an average voltage value of all effective monomer voltages in the current acquisition period, vl is an average voltage value of all the acquired effective monomer voltages of the AFE, and Vk is a set voltage threshold;
in step S2, if at least one abnormal monomer exists when step S1 is repeatedly executed, the frequency of diagnosing the disconnection fault is increased, and the monomer voltage value Vn of the previous acquisition period is not updated, otherwise, the acquired voltage value Vm of the current period is updated to the monomer voltage value Vn of the previous acquisition period;
in step S2, if the number of effective monomers is greater than 2, vm=va+vd, where Vd is the difference between the current effective monomer and the average voltage; if the number of effective monomer voltages is less than or equal to 2, the effective monomer voltage value before abnormality is used for replacing the marked abnormal monomer value, namely vn=vm.
2. The method for processing the monomer voltage when the AFE monomer is used for collecting and disconnecting wires according to claim 1, which is characterized in that: in the step S1, all effective voltages in the AFE are identified according to the single voltage acquisition configuration and the acquisition disconnection fault sign in the AFE, and if the number of the effective single voltages is less than or equal to 5, no treatment is performed.
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| CN202310997643.7A CN116834606B (en) | 2023-08-09 | 2023-08-09 | Processing method for monomer voltage during AFE monomer acquisition disconnection |
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| CN116834606B true CN116834606B (en) | 2024-02-23 |
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Citations (6)
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| JP2014060116A (en) * | 2012-09-19 | 2014-04-03 | Nissan Motor Co Ltd | Cell voltage measurement device |
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| CN110065394A (en) * | 2019-03-29 | 2019-07-30 | 福建省汽车工业集团云度新能源汽车股份有限公司 | A kind of power battery monomer low-voltage protection method and system |
| CN114274777A (en) * | 2021-12-15 | 2022-04-05 | 重庆长安新能源汽车科技有限公司 | Battery abnormity monitoring method and system and vehicle |
| CN114312319A (en) * | 2021-12-15 | 2022-04-12 | 重庆长安新能源汽车科技有限公司 | Battery safety monitoring method based on voltage accumulated value, storage medium and vehicle |
| CN115946573A (en) * | 2022-12-06 | 2023-04-11 | 北汽福田汽车股份有限公司 | Battery electric connection abnormity identification method and device, storage medium and new energy automobile |
-
2023
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014060116A (en) * | 2012-09-19 | 2014-04-03 | Nissan Motor Co Ltd | Cell voltage measurement device |
| CN108859764A (en) * | 2017-11-01 | 2018-11-23 | 深圳市仕威新能源有限公司 | Battery emergency failure method of disposal, device, system and automobile |
| CN110065394A (en) * | 2019-03-29 | 2019-07-30 | 福建省汽车工业集团云度新能源汽车股份有限公司 | A kind of power battery monomer low-voltage protection method and system |
| CN114274777A (en) * | 2021-12-15 | 2022-04-05 | 重庆长安新能源汽车科技有限公司 | Battery abnormity monitoring method and system and vehicle |
| CN114312319A (en) * | 2021-12-15 | 2022-04-12 | 重庆长安新能源汽车科技有限公司 | Battery safety monitoring method based on voltage accumulated value, storage medium and vehicle |
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