CN112380059B - Method and system for storing mileage information of vehicle instrument - Google Patents
Method and system for storing mileage information of vehicle instrument Download PDFInfo
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- CN112380059B CN112380059B CN202011271226.7A CN202011271226A CN112380059B CN 112380059 B CN112380059 B CN 112380059B CN 202011271226 A CN202011271226 A CN 202011271226A CN 112380059 B CN112380059 B CN 112380059B
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000004590 computer program Methods 0.000 claims description 9
- 230000011218 segmentation Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000013500 data storage Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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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
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
- G06F11/2094—Redundant storage or storage space
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The embodiment of the invention provides a method and a system for storing mileage information of a vehicle instrument, wherein the method comprises the following steps: calculating the mileage of the vehicle in real time by a vehicle instrument; writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data at intervals of preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment includes a predetermined number of data bits. The invention solves the problems of data error and loss which are easy to occur in the traditional method by utilizing the data segmentation and redundancy backup method, so that the accuracy of mileage information of the vehicle instrument is ensured. In addition, the data segmentation method expands a plurality of data bits, and expands the mileage information writing times of the memory on the premise of not increasing new hardware cost.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to a method and a system for storing mileage information of an automobile instrument.
Background
The mileage information is the most important information of the vehicle, is an important basis for three packages, buying, selling and maintaining of the vehicle, needs to be stored in real time, and cannot be lost or wrong.
At present, mileage information of a vehicle is stored in an eporom of a vehicle instrument, however, the writing frequency of one data bit of the eporom is only 100 ten thousand times, and the mileage information of the vehicle, namely the total mileage data, is at least 999999 kilometers, can be stored once every 1 kilometer, and the writing frequency of the eporom is approximate, so that the problem of data loss is very easy to occur. Moreover, only one data is stored at a time, and in extreme cases, the problem of data storage errors is easy to occur; the data precision saved by the method is only 1km, and the requirement of higher precision can not be met.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method and a system for storing mileage information of a vehicle meter, which overcome or at least partially solve the above problems.
In a first aspect, an embodiment of the present invention provides a method for storing mileage information of an instrument for a vehicle, including:
s1, calculating vehicle mileage in real time by a vehicle instrument;
s2, writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data every other preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment includes a predetermined number of data bits.
Preferably, before step S2, the method further comprises:
defining the total mileage data stored in the memory as two parts of data segments including a first data segment and a second data segment; and, total mileage data= (value of first data segment x n+second data segment effective value) = data accuracy;
wherein n is the total number of data bits of the second data segment, (the value of the first data segment is n+the effective value of the second data segment), which represents the number of times of storing the total mileage data, and the data precision represents the preset mileage length in step S2.
Preferably, the first data segment includes three identical sub-data.
Preferably, before writing the newly increased mileage of the vehicle into the first data piece and the second data piece of the total mileage data in step S2, the method further includes:
checking an initialization mark of the total mileage data, initializing the first data segment and the second data segment if the initialization mark is invalid, and marking the initialization valid after the initialization is completed;
if the initialization mark is valid, the correctness of the three sub-data of the first data segment is judged.
Preferably, the determining the correctness of the three sub-data of the first data segment includes:
if judging that the values of at least two parts of sub data in the three parts of sub data of the first data segment are the same, judging that the same sub data is correct sub data; and the value of the first data segment is the same value of the sub-data.
Preferably, in step S2, the writing of the newly added mileage length of the vehicle into the first data segment and the second data segment of the total mileage data at intervals of a preset mileage length specifically includes:
if the preset mileage is 1km, the instrument marks one data bit of the second data segment as valid when the vehicle runs for 1 km;
after all the data bits of the second data segment are marked valid, the second data segment is marked invalid, and the values of the three sub-data of the first data segment are respectively added by 1.
Preferably, the method for storing the mileage information of the vehicle instrument further comprises the following steps:
s3, reading the first data segment and the second data segment from the memory, and automatically calculating total mileage data according to the first data segment and the second data segment; wherein total mileage data= (value of first data segment x n+second data segment effective value) = data accuracy.
Preferably, the memory is a nonvolatile memory.
In a second aspect, an embodiment of the present invention provides a vehicle meter mileage information storage system, including a nonvolatile memory, a processor, and a computer program stored in the nonvolatile memory and capable of running on the processor, where the processor implements the vehicle meter mileage information storage method provided in the embodiment of the first aspect when executing the computer program.
In a third aspect, an embodiment of the present invention provides a non-transitory computer readable storage medium, where the non-transitory computer readable storage medium stores computer instructions that cause the computer to execute the method for storing vehicle meter mileage information provided in the embodiment of the first aspect.
The method and the system for storing the mileage information of the vehicle instrument, provided by the embodiment of the invention, solve the problems of data errors and loss which are easy to occur in the traditional method by utilizing the data segmentation and redundancy backup method, so that the mileage information correctness of the vehicle instrument is ensured. In addition, the data segmentation method expands a plurality of data bits, and expands the mileage data writing times of the memory on the premise of not increasing new hardware cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for storing mileage information of a vehicle instrument according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of data segmentation of total mileage data in a memory according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vehicle instrument mileage information storage system 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 invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
At present, mileage information of a vehicle is stored in an epom of a vehicle instrument, wherein the mileage information refers to total mileage data. However, the writing frequency of one data bit of the eporom is only 100 ten thousand times, and the mileage information of the vehicle is at least 999999 km to be stored, only once every 1km, and the writing frequency of the eporom is approximate, so that the problem of data loss is very easy to occur. Moreover, only one piece of data is stored at a time, and in extreme cases, the problem of data storage errors is liable to occur.
Therefore, the embodiment of the invention provides a vehicle instrument mileage information storage method, which solves the problems of data errors and loss which are easy to occur in the traditional mileage information storage method by utilizing the data segmentation and redundancy backup method, so that the mileage information correctness of the vehicle instrument is ensured. The following description and description will be made with reference to the drawings by way of various embodiments.
Fig. 1 is a schematic flow chart of a method for storing mileage information of a vehicle instrument according to an embodiment of the present invention. First, the overall principle of the method provided by the embodiment of the invention is described, and the method comprises the following steps:
s1, calculating vehicle mileage in real time by a vehicle instrument;
it can be understood that the vehicle meter can calculate the vehicle mileage in real time according to the speed and time of the present running, where the vehicle mileage refers to the mileage of the present running.
S2, writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data every other preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment includes a predetermined number of data bits.
In the embodiment of the invention, the first data segment and the second data segment of the total mileage data are written in real time by the newly increased mileage length of the vehicle and stored in the memory in the running process of the vehicle, so that the real-time storage of the total mileage data is ensured. Preferably, the memory in this embodiment is a nonvolatile memory.
Before step S2 is performed, the present invention defines the total mileage data stored in the memory as two-part data pieces including a first data piece and a second data piece. And, there is the following relationship between total mileage data and two parts of data segments:
total mileage data= (value of first data segment n+second data segment effective value) = data accuracy;
where n is the total number of data bits of the second data segment, i.e. the length of the second data segment. (value of the first data segment x n+effective value of the second data segment) represents the number of times of saving the total mileage data, and the data accuracy represents the preset mileage length in step S2. The second data segment valid value indicates the number of valid data bits in the current second data segment.
Fig. 2 is a schematic diagram of data segmentation of total mileage data in a memory according to an embodiment of the present invention, where the total mileage data includes a first data segment and a second data segment. The "data segment 1" in fig. 2 refers to the first data segment in the embodiment of the present invention, and the "data segment 2" in fig. 2 refers to the second data segment in the embodiment of the present invention. Referring to fig. 2, in the present embodiment, the first data segment includes three identical sub-data, wherein two sub-data are redundant copies. The problem of error in the storage of the recorded data of the instrument under extreme conditions can be avoided.
It can be appreciated that in this embodiment, the length of the second data segment, that is, the number of data bits, may be preset, and the meter marks one data bit of the second data segment valid every preset mileage length, for example, every 1km for driving the vehicle; after the last data bit of the second data segment is marked as valid, all data bits of the second data segment are marked as invalid, and the values of the three sub-data of the first data segment are respectively added with 1.
The method for storing the mileage information of the vehicle instrument provided by the embodiment of the invention solves the problems of data errors and loss which are easy to occur in the traditional method by utilizing the data segmentation and redundancy backup method, so that the mileage information correctness of the vehicle instrument is ensured. In addition, the data segmentation method expands a plurality of data bits, and expands the mileage information writing times of the memory on the premise of not increasing new hardware cost.
On the basis of the above embodiment, as an optional embodiment, before writing the newly added mileage length of the vehicle into the first data segment and the second data segment of the total mileage data in step S2, the vehicle meter mileage information saving method further includes:
checking an initialization mark of the total mileage data, initializing the first data segment and the second data segment if the initialization mark is invalid, and marking the initialization valid after the initialization is completed;
if the initialization mark is valid, the correctness of the three sub-data of the first data segment is judged.
Specifically, referring to fig. 2, the total mileage data stored in the memory further includes an initialization flag. Before writing in the newly added mileage length and storing, firstly checking an initialization mark of the total mileage data, if the initialization mark is invalid, initializing the first data segment and the second data segment, wherein the initialization process is to clear the data of the first data segment and mark the second data segment as invalid. After the initialization is completed, the flag initialization is valid. Thus, the total mileage data need only be initialized once.
Further, if the initialization flag is checked to find that the initialization flag is valid, the correctness of the three sub-data of the first data segment is judged. The process for judging the correctness of the three sub-data of the first data segment comprises the following steps: if judging that the values of at least two parts of sub data in the three parts of sub data of the first data segment are the same, judging that the same sub data is correct sub data; and the value of the first data segment is the same value of the sub-data.
According to the method for storing the mileage information of the vehicle instrument, provided by the embodiment of the invention, after the initialization mark is checked, the error data can be automatically corrected, and the accuracy of the stored total mileage data is improved.
Based on the foregoing embodiments, in step S2, writing the newly added mileage length of the vehicle into the first data segment and the second data segment of the total mileage data every preset mileage length, which specifically includes:
if the preset mileage is 1km, the instrument marks one data bit of the second data segment as valid when the vehicle runs for 1 km;
when all the marks of the data bits of the second data segment are valid, the data of the second data segment is cleared, and the values of three sub-data of the first data segment are respectively added by 1. Total mileage data= (value of first data segment n+second data segment valid value) = data accuracy.
Thus, when the length n of the second data segment is 10, i.e. the second data segment comprises 10 data bits. It is understood that the number of times of saving the mileage data for one round is 10. The value of the first data segment represents the number of rounds in which the total mileage data is saved for 10 times. The second data segment valid value is the number of data bits marked valid in the current second data segment, and the range of second data segment valid values [0, n-1] is rounded. It can be understood that the total mileage data= (the value of the first data segment x n+the second data segment effective value) = data accuracy. Wherein (the value of the first data segment is n+the effective value of the second data segment) represents the number of times of saving the total mileage data.
The existing mileage information preservation method has the problem that the precision of the preserved data is only 1km, and the requirement of higher precision cannot be met. For this problem, the present embodiment can set the preset mileage in S2 to 0.1km, that is, the data accuracy to 0.1km. When the vehicle runs for 0.1km, the total mileage data is stored once. Compared with the prior art that the data precision of the stored total mileage data is only 1km, the method can improve the data precision of the stored total mileage data.
In one embodiment, an exemplary method for storing mileage information provided by the embodiment of the present invention is:
assuming that before the vehicle travels, the values of three sub-data in the first data segment are all 20, the effective value of the second data segment is 0, and the total mileage data of the vehicle which has been traveled before the vehicle travels this time is (20×10+0) ×0.1 km=20 km. Assuming that the second data segment includes 10 data bits, the preset mileage in step S2 is 0.1km, i.e. the data precision is 0.1km. Then, when the vehicle travels for 0.1km, the meter marks one data bit of the second data segment valid, and when the vehicle travels for 0.9km, the meter marks 9 data bits in the second data segment valid. At this time, total mileage data= (20×10+9) ×0.1 km=20.9 km.
Further, when the vehicle runs for 1km, all 10 data bits in the second data segment are written with 0.1km, all data bits in the second data segment are marked as valid, at this time, all data bits in the second data segment are marked as invalid, and all values of three sub-data in the first data segment are added with 1, at this time, the value of the first data segment is 20+1, and the valid value of the second data segment is 0. Total mileage data= (21×10+0) ×0.1 km=21 km.
On the basis of the above embodiment, the method for storing the mileage information of the vehicle instrument further includes:
s3, reading the first data segment and the second data segment from the memory, and automatically calculating total mileage data according to the first data segment and the second data segment; wherein total mileage data= (value of first data segment x n+second data segment effective value) = data accuracy.
In this embodiment, after the total mileage data is written into and stored in the memory, when the user needs to read the current total mileage data, the first data segment and the second data segment are read from the memory, and the total mileage data is automatically calculated according to the first data segment and the second data segment by adopting the above formula, so that the current total mileage data can be read.
In one embodiment, fig. 3 is a schematic structural diagram of a vehicle meter mileage information storage system according to an embodiment of the present invention, and referring to fig. 3, an embodiment of the present invention provides a vehicle meter mileage information storage system, which includes a nonvolatile memory, a processor, and a computer program stored in the nonvolatile memory and capable of running on the processor, where the processor and the nonvolatile memory are connected through a communication line. The steps of implementing the method for storing vehicle meter mileage information provided by the embodiment of the first aspect when the processor executes the computer program include, for example: s1, calculating vehicle mileage in real time by a vehicle instrument; s2, writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data every other preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment includes a predetermined number of data bits.
In one embodiment, based on the same conception, the embodiment of the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program which is implemented when executed by a processor to perform the steps of the vehicle meter mileage information saving method provided in the above embodiments, for example, including: s1, calculating vehicle mileage in real time by a vehicle instrument; s2, writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data every other preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment includes a predetermined number of data bits.
In summary, the embodiment of the invention provides a method and a system for storing mileage information of a vehicle instrument, which solve the problems of data errors and loss easily occurring in the traditional method by utilizing a data segmentation and redundancy backup method, so that the accuracy of the mileage information of the vehicle instrument is ensured. In addition, the data segmentation method expands a plurality of data bits, and expands the mileage information writing times of the memory on the premise of not increasing new hardware cost.
The embodiments of the present invention may be arbitrarily combined to achieve different technical effects.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The method for storing the mileage information of the vehicle instrument is characterized by comprising the following steps of:
s1, calculating vehicle mileage in real time by a vehicle instrument;
s2, writing the newly increased mileage length of the vehicle into a first data segment and a second data segment of total mileage data every other preset mileage length, and storing the first data segment and the second data segment in a memory; wherein the second data segment comprises a preset number of data bits;
prior to step S2, the method further comprises:
defining the total mileage data stored in the memory as two parts of data segments including a first data segment and a second data segment; and, total mileage data= (value of first data segment x n+second data segment effective value) = data accuracy;
wherein n is the total number of data bits of the second data segment, (the value of the first data segment is n+the effective value of the second data segment) represents the number of times of storing the total mileage data, and the data precision represents the preset mileage length in step S2;
the number of data bits of the second data segment may be preset, and the meter marks one data bit of the second data segment valid every preset mileage length, and marks all data bits of the second data segment invalid after the last data bit of the second data segment is marked valid.
2. The vehicle meter mileage information maintaining method according to claim 1, wherein the first data piece includes three identical sub data.
3. The vehicle meter mileage information keeping method according to claim 2, wherein before writing the newly added mileage length of the vehicle into the first data piece and the second data piece of the total mileage data in step S2, the method further includes:
checking an initialization mark of the total mileage data, initializing the first data segment and the second data segment if the initialization mark is invalid, and marking the initialization valid after the initialization is completed;
if the initialization mark is valid, the correctness of the three sub-data of the first data segment is judged.
4. The method for saving vehicle meter mileage information according to claim 3, wherein said determining the correctness of the three sub-data of the first data segment includes:
if judging that the values of at least two parts of sub data in the three parts of sub data of the first data segment are the same, judging that the same sub data is correct sub data; and the value of the first data segment is the same value of the sub-data.
5. The method for saving vehicle meter mileage information according to claim 4, wherein in step S2, the newly added mileage length of the vehicle is written into the first data segment and the second data segment of the total mileage data every preset mileage length, specifically comprising:
if the preset mileage is 1km, the instrument marks one data bit of the second data segment as valid when the vehicle runs for 1 km;
after all the data bits of the second data segment are marked valid, the second data segment is marked invalid, and the values of the three sub-data of the first data segment are respectively added by 1.
6. The vehicle meter mileage information maintaining method according to claim 1, further comprising:
s3, reading the first data segment and the second data segment from the memory, and automatically calculating total mileage data according to the first data segment and the second data segment; wherein total mileage data= (value of first data segment x n+second data segment effective value) = data accuracy.
7. The vehicle meter mileage information maintaining method according to claim 1, wherein the memory is a nonvolatile memory.
8. A vehicle meter mileage information keeping system, characterized by comprising a non-volatile memory, a processor and a computer program stored in the non-volatile memory and executable on the processor, said processor implementing the steps of the vehicle meter mileage information keeping method according to any one of claims 1 to 7 when executing said computer program.
9. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the vehicle meter mileage information saving method according to any one of claims 1 to 7.
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