CN113762341A - Vehicle fault priority calculation method and system - Google Patents
Vehicle fault priority calculation method and system Download PDFInfo
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- CN113762341A CN113762341A CN202110889385.1A CN202110889385A CN113762341A CN 113762341 A CN113762341 A CN 113762341A CN 202110889385 A CN202110889385 A CN 202110889385A CN 113762341 A CN113762341 A CN 113762341A
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- 238000004364 calculation method Methods 0.000 title claims description 18
- 230000003068 static effect Effects 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000001186 cumulative effect Effects 0.000 claims description 19
- 238000012913 prioritisation Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 230000015654 memory Effects 0.000 abstract description 22
- 230000000694 effects Effects 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011058 failure modes and effects analysis Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
- G06F18/211—Selection of the most significant subset of features
- G06F18/2113—Selection of the most significant subset of features by ranking or filtering the set of features, e.g. using a measure of variance or of feature cross-correlation
Abstract
The invention provides a method and a system for calculating the priority of a vehicle fault, wherein the method comprises the steps of respectively calculating the static priority and the dynamic priority of the current fault after the occurrence of the fault is confirmed; and calculating the fault priority of the current fault based on the fault static priority and the fault dynamic priority. According to the fault storage method and the fault storage device, the fault priority is calculated according to the fault static priority and the fault dynamic priority, and based on the storage priority of the fault code corresponding to the fault priority, the risk that frequently-occurring faults cannot enter the fault memory for storage or the fault memory is kicked out by the fault code with the higher fixed priority is reduced, the fault is rapidly maintained, and the fault storage device and the fault storage method and the fault storage device are suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of fault code storage, in particular to a method and a system for calculating a vehicle fault priority.
Background
To facilitate the troubleshooting of the vehicle, the fault code needs to be stored in the fault memory when a fault occurs so that the diagnostic tool can read the fault and the status of the fault code. In order to save the cost of the controller, the fault code storage memories in the electronic control unit are limited in number, all fault codes cannot be stored, and whether the fault code storage memories are accessed to store the fault codes needs to be judged according to the fault priority when the fault occurs.
In the prior art, the priority of the fault code is generally a fixed value obtained by DFMEA (Design Failure Mode and Effects Analysis) Analysis. The risk that faults which are frequently generated but have low priority of fault codes cannot enter a fault memory for storage exists, the risk that the fault codes are stored, the fault priorities are not updated after the corresponding faults occur again, and the fault codes are replaced by new faults exists, so that the fault codes cannot be read by diagnostic equipment, and after-sales personnel cannot maintain in time, and potential safety hazards are caused to vehicle operation.
Disclosure of Invention
The invention provides a vehicle fault priority calculation method and a vehicle fault priority calculation system, which are used for solving the problem of potential safety hazard in the existing fault code priority storage method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a method for calculating a priority of a vehicle fault, including the steps of:
after confirming that the fault occurs, respectively calculating the fault static priority and the fault dynamic priority of the current fault;
and calculating the fault priority of the current fault based on the fault static priority and the fault dynamic priority.
Further, the method comprises the following steps after calculating the fault priority of the current fault:
and sequencing the corresponding fault codes based on the fault priority.
Further, the basis for confirming the fault occurrence is that the fault occurrence exceeds the fault jitter time.
Further, the calculation of the static priority of the fault specifically includes:
acquiring a fail-safe static priority value from a fail-safe static priority CURVE table and acquiring a fail-safe static priority value from a fail-safe emission static priority CURVE table based on an index value of a current failure;
and carrying out weighted summation on the value of the fault safety static priority and the value of the fault emission static priority to obtain the fault static priority.
Further, the fail-safe static priority is weighted more heavily than the fail-safe static priority.
Further, the calculation of the fault dynamics with priority is specifically as follows:
respectively acquiring a value of the priority of the cumulative occurrence frequency of the faults, a value of the priority of the frequency of the faults and a value of the priority of the fault storage state from a fault dynamic priority MAP table based on an index value of the current faults, the cumulative occurrence frequency of the faults, the frequency of the faults and the fault storage state;
and carrying out weighted summation on the value of the priority of the cumulative occurrence times of the faults, the value of the priority of the occurrence frequency of the faults and the value of the priority of the storage state of the faults to obtain the dynamic priority of the faults.
Further, the weight of the failure occurrence frequency priority, the failure storage state priority and the failure accumulated occurrence frequency priority is sequentially reduced.
A second aspect of the present invention provides a vehicle fault prioritization computing system, comprising:
the first calculating unit is used for respectively calculating the fault static priority and the fault dynamic priority of the current fault after the fault is confirmed to occur;
a second calculation unit calculating a fault priority of a current fault based on the fault static priority and the fault dynamic priority
Further, the system also comprises a sorting unit, and the sorting unit sorts the corresponding fault codes based on the fault priority.
A third aspect of the invention provides a computer storage medium having stored therein computer instructions which, when run on the computing system, cause the computing system to perform the steps of the method.
The system according to the second aspect of the present invention is capable of implementing the method according to the first aspect and each implementation manner of the first aspect, and achieves the same effects.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
according to the fault storage method and the fault storage device, the fault priority is calculated according to the fault static priority and the fault dynamic priority, and based on the storage priority of the fault code corresponding to the fault priority, the risk that frequently-occurring faults cannot enter the fault memory for storage or the fault memory is kicked out by the fault code with the higher fixed priority is reduced, the fault is rapidly maintained, and the fault storage device and the fault storage method and the fault storage device are suitable for large-scale application.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic flow chart of a specific implementation of the method of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of the system of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
As shown in fig. 1 and 2, the present invention provides a method for calculating a priority of a vehicle fault, comprising the following steps:
s1, respectively calculating the fault static priority and the fault dynamic priority of the current fault after confirming that the fault occurs;
s2, calculating the fault priority of the current fault based on the fault static priority and the fault dynamic priority.
In step S1, the basis for the failure occurrence is determined as the failure occurrence exceeds the jitter (debounce) time. And if the fault is in the confirmed state, calculating the fault priority to be used as a fault storage basis, if the fault is not in the confirmed state, keeping the fault priority as an original value, and then respectively calculating the fault static priority and the fault dynamic priority.
In another embodiment of the present invention, the method further comprises, after calculating the fault priority of the current fault, the steps of:
and sequencing the corresponding fault codes based on the fault priority.
In this embodiment, a larger fault priority value indicates a higher fault priority. And after the fault priority is calculated, the corresponding fault codes are sequentially stored from front to back according to the sequence of the fault priority from big to small. In this embodiment, the fault code with the highest fault priority is stored in the first bit.
As shown in fig. 2, first, a failure confirmation is performed, as in S100; then, calculating the static priority of the failure safety, such as S101; fault emission static priority calculation, such as S102; calculating the static priority of the fault according to the S101 and the S102S 103; next, priority of cumulative occurrence number of faults is carried out, in step S104; priority of frequency of occurrence of failure, as in S105; fault storage status priority, e.g., S106; and based on steps S104-S106, calculating the dynamic priority of the fault, such as S107; based on step S107 and step S103, the failure priority is calculated as S108, and the stored failure code sorting is performed as S109.
In steps S101 and S102, based on the index value of the current fault, obtaining the value of the fail-safe static priority from the fail-safe static priority CURVE table and obtaining the value of the fail-safe emission static priority from the fail-emission static priority CURVE table;
in step S103, the value of the fail-safe static priority and the value of the fail-safe static priority are weighted and summed to obtain the fail-safe static priority.
The CURVE table of the failure safety static priority calibrates an initial value to judge each failure driving safety grade from three dimensions of unexpected acceleration, unexpected deceleration and unexpected turning of a driving from a failure, and the failure driving safety grade is divided into four grades: no influence on the safety level, slight influence on the safety level, moderate influence on the safety level and severe influence on the safety level.
In this embodiment, the non-affected security level, the slightly affected security level, the moderately affected security level, and the heavily affected security level in the static security-related priority levels are 0, 20, 50, and 90 in sequence.
The fault emission static priority CURVE table is calibrated to have an initial value of judging each fault emission grade from three dimensions of fault to NOx emission, PM emission and CO2 emission, and the fault emission grade is divided into four grades: a no influence emission level, a light influence emission level, a moderate influence emission level and a heavy influence emission level;
in this embodiment, the values of the priorities corresponding to the no-influence, light-influence, medium-influence and heavy-influence emission levels in the static priority levels related to the fault emission are 0, 15, 45 and 80 in sequence.
The weight of the fail-safe static priority is greater than that of the fail-safe static priority, and if the weight values are 0.9 and 0.7 respectively.
In steps S104-S106, respectively acquiring a fault accumulated occurrence frequency priority value, a fault occurrence frequency priority value and a fault storage state priority value from a fault dynamic priority MAP table based on an index value of a current fault, the fault accumulated occurrence frequency, the fault occurrence frequency and the fault storage state;
in step S107, the value of the priority of the cumulative occurrence frequency of the fault, the value of the priority of the occurrence frequency of the fault, and the value of the priority of the storage state of the fault are weighted and summed to obtain the dynamic priority of the fault.
In this embodiment, the failure dynamic priority MAP table is divided into a failure cumulative occurrence frequency priority MAP table, a failure occurrence frequency priority MAP table, and a failure storage state priority MAP table.
In this embodiment, the current cumulative occurrence number of faults is increased by 1 every time a fault is changed from no fault to a fault confirmation, and the maximum limit value is 65535.
In this embodiment, the MAP calibration value of the cumulative number of occurrences of the fault increases as the cumulative number of occurrences of the fault increases, the value of the calibrated priority is 0 when the cumulative number of occurrences of the fault is 0, the upper limit of the calibrated priority value is 70, and the value is maintained at 70 after reaching the upper limit.
In this embodiment, the failure occurrence frequency priority is obtained by looking up a dynamic priority CURVE table related to the failure occurrence frequency.
In this embodiment, the failure occurrence frequency is the cumulative number of times that the current failure occurs for one week of the cumulative operating time of the vehicle, and the failure occurrence frequency is updated when the cumulative operating time of the vehicle reaches the threshold value for one week.
In this embodiment, the dynamic priority MAP table calibration related to the fault occurrence frequency increases as the fault occurrence frequency increases, the priority value is set to 0 when the cumulative occurrence frequency of faults is 0, the upper limit of the priority value is set to 90, and the priority value is maintained at 90 after reaching the upper limit.
In this embodiment, the priority of the storage state of the faulty memory is obtained by checking a MAP table of dynamic related priorities of the storage state of the faulty memory according to the storage state of the faulty memory. The calibration initial value of the priority MAP table of the storage state of the fault memory is divided into a historical activated fault code state, a pending fault code state, a confirmed and activated fault code state and a permanent fault code state according to the storage state of the fault memory, and the priorities of the fault code state and the permanent fault code state are sequentially increased.
In this embodiment, the failure memory storage state priority calculation policy is as follows: firstly, judging whether the current fault is stored in a fault memory: if the fault is not stored in the fault memory, the priority of the storage state of the fault memory is 0; and if the fault is stored in the fault memory, inquiring the storage state in the fault memory, and checking a dynamic relevant priority MAP table of the storage state of the fault memory according to the fault storage state to obtain the priority of the storage state of the fault memory.
In this embodiment, the priority of the storage state of the faulty memory corresponding to the storage state of the faulty memory is divided into a historical activated fault code state, an undetermined fault code state, a confirmed and activated fault code state, and a permanent fault code state, and the priority corresponding values are 20, 40, 80, and 90 in sequence.
In this embodiment, the priority of the occurrence frequency of the fault, the priority of the storage state of the fault, and the priority of the cumulative occurrence frequency of the fault influence the proportion in turn. Such as weight values of 0.9, 0.8 and 0.6 in sequence.
In step S108, the failure static priority and the failure dynamic priority are added to obtain a failure priority.
In step S109, the stored fault codes are reordered according to the calculated fault priority.
The CURVE table and the MAP table mentioned in the above embodiments describe the corresponding relationship between parameters under different conditions. Wherein the CURVE table can be obtained by functional safety analysis calculation; the fault discharge static priority CURVE table can be obtained by a discharge bench test; the failure accumulation occurrence frequency priority MAP table, the failure occurrence frequency priority MAP table and the failure storage state priority MAP table are obtained by firstly giving a calibration initial value and then calibrating and optimizing in an actual test.
As shown in fig. 3, the present invention provides a calculation system of vehicle failure priority, which includes a first calculation unit 1, a second calculation unit 2, and a ranking unit 3.
After confirming that a fault occurs, the first calculating unit 1 respectively calculates the fault static priority and the fault dynamic priority of the current fault; the second calculating unit 2 calculates the fault priority of the current fault based on the fault static priority and the fault dynamic priority; the sorting unit 3 sorts the corresponding fault codes based on the fault priority.
The computing system of the invention can realize the steps of the embodiments of the computing method and obtain the same effect.
The present invention also provides a computer storage medium having stored therein computer instructions which, when run on the computing system, cause the computing system to perform the steps of the computing method.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. A method for calculating the priority of a vehicle fault is characterized by comprising the following steps:
after confirming that the fault occurs, respectively calculating the fault static priority and the fault dynamic priority of the current fault;
and calculating the fault priority of the current fault based on the fault static priority and the fault dynamic priority.
2. The method for calculating the priority of a vehicle fault as claimed in claim 1, further comprising the steps of, after calculating the fault priority of the current fault:
and sequencing the corresponding fault codes based on the fault priority.
3. The method for calculating the priority of the vehicle fault according to claim 1 or 2, wherein the calculation of the fault static priority is specifically as follows:
acquiring a fail-safe static priority value from a fail-safe static priority CURVE table and acquiring a fail-safe static priority value from a fail-safe static priority CURVE table based on an index value of a current failure occurring;
and carrying out weighted summation on the value of the fault safety static priority and the value of the fault emission static priority to obtain the fault static priority.
4. The method of calculating the priority of vehicle failure according to claim 3, wherein the fail-safe static priority is weighted more heavily than the fail-safe emission static priority.
5. The method for calculating the priority of the vehicle fault according to claim 1 or 2, wherein the fault dynamics prioritized calculation is specifically as follows:
respectively acquiring a value of the priority of the cumulative occurrence frequency of the faults, a value of the priority of the frequency of the faults and a value of the priority of the fault storage state from a fault dynamic priority MAP table based on an index value of the current faults, the cumulative occurrence frequency of the faults, the frequency of the faults and the fault storage state;
and carrying out weighted summation on the value of the priority of the cumulative occurrence times of the faults, the value of the priority of the occurrence frequency of the faults and the value of the priority of the storage state of the faults to obtain the dynamic priority of the faults.
6. The method for calculating the priority of a vehicle failure according to claim 5, wherein the priorities of the failure occurrence frequency priority, the failure storage state priority and the failure cumulative occurrence number priority are sequentially reduced in weight.
7. A vehicle fault prioritization computing system, the computing system comprising:
the first calculating unit is used for respectively calculating the fault static priority and the fault dynamic priority of the current fault after the fault is confirmed to occur;
and the second calculation unit is used for calculating the fault priority of the current fault based on the fault static priority and the fault dynamic priority.
8. The vehicle fault prioritization system of claim 7, further comprising a ranking unit that ranks corresponding fault codes based on the magnitude of the fault priorities.
9. A computer storage medium having computer instructions stored thereon, which, when run on the computing system of claim 7 or 8, cause the computing system to perform the steps of the method of claim 1 or 2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117572852A (en) * | 2024-01-16 | 2024-02-20 | 中国第一汽车股份有限公司 | Vehicle component fault analysis method, device, equipment, medium and product |
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