CN113849338B - Combined instrument total mileage storage device and method - Google Patents
Combined instrument total mileage storage device and method Download PDFInfo
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- CN113849338B CN113849338B CN202111147632.7A CN202111147632A CN113849338B CN 113849338 B CN113849338 B CN 113849338B CN 202111147632 A CN202111147632 A CN 202111147632A CN 113849338 B CN113849338 B CN 113849338B
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- total mileage
- storage
- odo
- mileage
- partition
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005192 partition Methods 0.000 claims abstract description 38
- 238000004590 computer program Methods 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0644—Management of space entities, e.g. partitions, extents, pools
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Security & Cryptography (AREA)
- Quality & Reliability (AREA)
- Measurement Of Distances Traversed On The Ground (AREA)
Abstract
The invention discloses a total mileage storage device of a combination instrument, which comprises an EEPROM, wherein the EEPROM is provided with n subareas, and each subarea is used for storing: the total mileage ODO, a CRC check code corresponding to the value of the total mileage ODO, and the number of errors M read or written. When the method is used for storing, the total mileage ODO and the CRC check code corresponding to the value of the total mileage ODO are stored at the same time, and the total mileage ODO is checked by using the CRC check code when the method is used for reading; and no storage and reading operations are performed on partitions where the number of errors M exceeds a certain value. The invention improves the reliability of the total mileage ODO data.
Description
Technical Field
The invention relates to the field of total mileage storage of vehicles, in particular to a total mileage storage device and method of a combination instrument.
Background
The combination meter is an important part for a driver to acquire vehicle information, the driver can acquire the vehicle speed, the rotating speed, the total mileage and alarm information of various vehicles through the combination meter, and the driver can perform the next operation on the vehicles according to the information acquired by the combination meter. The total mileage is an important information in the combination instrument, and has the characteristics of accuracy, reliability and uniqueness, and a user can judge when to maintain according to the total mileage; with the gradual rise of the automobile second-hand market, the importance of the total mileage is further improved, the reliability of the total mileage requirement is very high, and the total mileage requirement cannot be lost, hopped and tampered in the whole life cycle of the vehicle. For the above reasons, a method of storing the total mileage in the combination meter is very important.
Disclosure of Invention
The invention aims to provide a total mileage storage device and method for a combination instrument, so as to improve the accuracy and reliability of total mileage data.
In order to solve the technical problems, the invention provides a technical scheme that: a combined instrument total mileage storage method, in which total mileage is stored in an EEPROM provided with n partitions each for storing: the method comprises the steps of totalizing mileage ODO, CRC check codes corresponding to the value of the totalized mileage ODO and the number M of errors of reading or writing, wherein the storage steps are as follows:
s1, when a vehicle turns from IGN_ON to IGN_OFF or runs for k kilometers in the running process of the vehicle, storing the current total mileage ODO and the corresponding CRC check code;
s2, if the storage fails in the storage process, adding 1 to the error number M in the partition with the storage failure, and storing the next partition, wherein the partition with the error number M being more than or equal to M is not stored; if the error times M of all the partitions in one storage operation meet M more than or equal to M, outputting a storage failure signal; if the storage is successful in the storage process, the error times M in the partition with the storage failure are zeroed;
the reading steps are as follows:
r1, when BAT is powered on, reading the total mileage ODO and CRC check codes stored in all the partitions, carrying out correctness check on the corresponding total mileage ODO by utilizing each CRC check code, then outputting the maximum value in all the correct total mileage ODO, and adding 1 to the error times M of the partitions which are failed in the correctness check;
r2, when the vehicle is IGN_ON, directly reading the total mileage ODO in the memory.
M=5 according to the above scheme.
In the above scheme, k=1.
A cluster total mileage storage device, the device comprising an EEPROM provided with n partitions, wherein each partition is for storing: the total mileage ODO, a CRC check code corresponding to the value of the total mileage ODO, and the number of errors M read or written.
In the above scheme, n=5.
An automobile stores the total mileage ODO by using the combination meter total mileage storage method described above.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the cluster total mileage storage method as described above when the computer program is executed.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the cluster total mileage storage method as described above.
The beneficial effects of the invention are as follows: by dividing the EEPROM into a plurality of partitions, each partition performs independent storage and reading operation, and the improvement of the storage and reading fault tolerance rate is realized on the basis of not changing original hardware.
Further, by synchronously storing the CRC check code associated with the total mileage ODO in the storage process and carrying out CRC check on the total mileage ODO in the reading process, the accuracy of the read total mileage ODO is improved.
Drawings
FIG. 1 is a flow chart of a total mileage storage according to an embodiment of the present invention;
FIG. 2 is a flow chart of the aggregate mileage reading and storing according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Referring to fig. 1 and 2, a total mileage storage method of a combination meter includes the following storage steps:
s1, when a vehicle turns from IGN_ON to IGN_OFF or the vehicle runs for 1 km each time under a certain vehicle speed condition, storing the current total mileage ODO and a corresponding CRC check code;
s2, if the storage fails in the storage process, adding 1 to the error number M in the partition with the storage failure, and storing the next partition, wherein the partition with the error number M being more than or equal to 5 is not stored; if the error times M of all the partitions in one storage operation meet M more than or equal to 5, outputting a storage failure signal; if the storage is successful in the storage process, the error times M in the partition with the storage failure are zeroed;
the reading steps are as follows:
r1, when BAT is powered on, reading the total mileage ODO and CRC check codes stored in all the partitions, carrying out correctness check on the corresponding total mileage ODO by utilizing each CRC check code, then outputting the maximum value in all the correct total mileage ODO, and adding 1 to the error times M of the partitions which are failed in the correctness check;
r2, when the vehicle is IGN_ON, directly reading the total mileage ODO in the memory.
A cluster total mileage storage device, the device comprising an EEPROM provided with 5 partitions, wherein each partition is for storing: the total mileage ODO, a CRC check code corresponding to the value of the total mileage ODO, and the number of errors M read or written.
Partition and storage information is as follows:
| first partition | Second partition | Third partition | Fourth partition | Fifth partition |
| ODO 1 | ODO 2 | ODO 3 | ODO 4 | ODO 5 |
| CRC 1 | CRC 2 | CRC 3 | CRC 4 | CRC 5 |
| M 1 | M 2 | M 3 | M 4 | M 4 |
An automobile stores the total mileage ODO by using the combination meter total mileage storage method described above.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the cluster total mileage storage method as described above when the computer program is executed.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the cluster total mileage storage method as described above.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (8)
1. A total mileage storage method of a combination instrument is characterized in that: in the method, the total mileage is stored in an EEPROM, and the EEPROM is provided with n partitions, wherein each partition is used for storing: the method comprises the steps of totalizing mileage ODO, CRC check codes corresponding to the value of the totalized mileage ODO and the number M of errors of reading or writing, wherein the storage steps are as follows:
s1, when a vehicle turns from IGN_ON to IGN_OFF or runs for k kilometers in the running process of the vehicle, storing the current total mileage ODO and the corresponding CRC check code;
s2, if the storage fails in the storage process, adding 1 to the error number M in the partition with the storage failure, and storing the next partition, wherein the partition with the error number M being more than or equal to M is not stored; if the error times M of all the partitions in one storage operation meet M more than or equal to M, outputting a storage failure signal; if the storage is successful in the storage process, the error times M in the partition with the storage failure are zeroed;
the reading steps are as follows:
r1, when BAT is powered on, reading the total mileage ODO and CRC check codes stored in all the partitions, carrying out correctness check on the corresponding total mileage ODO by utilizing each CRC check code, then outputting the maximum value in all the correct total mileage ODO, and adding 1 to the error times M of the partitions which are failed in the correctness check;
r2, when the vehicle is IGN_ON, directly reading the total mileage ODO in the memory.
2. The combination meter total mileage storage method of claim 1, wherein: m=5.
3. The combination meter total mileage storage method of claim 1, wherein: k=1.
4. A combination meter total mileage storage apparatus for realizing the combination meter total mileage storage method according to any one of claims 1 to 3, wherein: the device comprises an EEPROM provided with n partitions, each of which is intended to store: the total mileage ODO, a CRC check code corresponding to the value of the total mileage ODO, and the number of errors M read or written.
5. The combination meter total mileage storage apparatus of claim 4, wherein: n=5.
6. An automobile, characterized in that: the storage of the total mileage ODO is performed using the combination meter total mileage storage method according to any one of claims 1 to 3.
7. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized by: the processor, when executing the computer program, implements the steps of the method for storing total mileage of a combination meter according to any one of claims 1 to 3.
8. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program when executed by a processor implements the steps of the cluster total mileage storage method according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111147632.7A CN113849338B (en) | 2021-09-29 | 2021-09-29 | Combined instrument total mileage storage device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111147632.7A CN113849338B (en) | 2021-09-29 | 2021-09-29 | Combined instrument total mileage storage device and method |
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| CN113849338A CN113849338A (en) | 2021-12-28 |
| CN113849338B true CN113849338B (en) | 2024-03-01 |
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| CN113849338A (en) | 2021-12-28 |
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