CN104978534A - Method and system for preventing vehicle mileage tampering - Google Patents
Method and system for preventing vehicle mileage tampering Download PDFInfo
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- CN104978534A CN104978534A CN201410146078.4A CN201410146078A CN104978534A CN 104978534 A CN104978534 A CN 104978534A CN 201410146078 A CN201410146078 A CN 201410146078A CN 104978534 A CN104978534 A CN 104978534A
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Abstract
The invention provides a method and a system for preventing vehicle mileage tampering. The method comprises the following steps of: obtaining mileage record data of a vehicle; performing data checking calculation on the obtained mileage record data and then obtaining a checking value; performing coding processing on the mileage record data and the checking value obtained after the calculation to form mileage record data backup and storing the mileage record data backup, wherein the storage position of the mileage record data backup is different from a conventional storage position of the mileage record data; during vehicle ignition starting, comparing the mileage corresponding to the mileage record data backup with the mileage obtained from the conventional storage position, and comparing the checking value obtained after the calculation with the checking value corresponding to the mileage obtained from the conventional storage position; if the mileages are consistent and the checking values are consistent, normally displaying the mileage obtained from the conventional storage position by a vehicle instrument; and if at least one item is inconsistent, displaying error prompt through the vehicle instrument. Therefore whether the vehicle running mileage is artificially modified or not can be known, so that the vehicle running mileage is prevented from being illegally tempered.
Description
Technical field
The present invention relates to automation field, being specifically related to a kind of for preventing the method and system of tampering vehicle mileage.
Background technology
In used automobile market, the distance travelled of vehicle is used to estimate one of vehicle condition very important reference frame, can have influence on the selling price of vehicle to a great extent.Therefore, market there is illegal cracker by the distance travelled of tampering vehicle, make vehicular meter can not reflect the newness degree of vehicle faithfully, thus illegally make a profit.
Current a kind of common tampering methods is compared by the EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM) of the distance travelled to store car in vehicular meter, find out flash memory (flash) address of the distance travelled of registration of vehicle, revise value corresponding to this address and realize distorting.
For example, as shown in Figure 1, first, the data Replica stored by EEPROM in vehicular meter is in another EEPROM, when vehicle travels comparatively short distance (such as 2km), respectively by the data copy of two EEPROM out, be designated as EEPROM1, EEPROM2 respectively.The data now travelled in 2km, EEPROM1 due to vehicle can change thereupon, and the data that EEPROM2 is corresponding then remain unchanged.Then, EEPROM1, EEPROM2 are compared, find out different data blocks, thus determine which data block there occurs change along with the traveling of vehicle.Because the data stored in EEPROM are except the distance travelled of vehicle, also may comprise multiple data blocks of other several data such as travel direction composition, illegal cracker and do not know data block which flash address stores corresponding be distance travelled.Then, illegal interpolater rewrites a data block in the data block that EEPROM1 changes one by one, observe the distance travelled shown in instrument more whether to change thereupon, if constant, then continue to rewrite next data block, until find the data block that the distance travelled shown in instrument can change thereupon, this data block is called correct data block, its correspondence be distance travelled.Finally, illegal cracker just can at random revise this data block, thus the distance travelled of the vehicle shown in vehicular meter will change thereupon, and is not inconsistent with the actual travel mileage of vehicle.
Summary of the invention
In order to prevent the distance travelled of vehicle by artificial illegal modifications, the invention provides a kind of for preventing the method and system of tampering vehicle mileage, can learn whether the distance travelled of vehicle is modified fast, thus to prevent the distance travelled of vehicle from illegally being distorted.
The invention provides a kind of for preventing the method for tampering vehicle mileage, the method comprises:
Obtain the mileage record data of vehicle;
For obtained mileage record data, after carrying out data check calculating, obtain proof test value;
To form mileage record data backup after the proof test value coded treatment obtained after mileage record data and calculating and preserve, the memory location of mileage record data backup be different from the conventional memory location of the mileage record data in vehicular meter;
When vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating for the mileage corresponding to mileage record data backup is compared;
If all consistent, then normally shown the mileage obtained from conventional memory location by vehicular meter;
If at least one is inconsistent, then show miscue by vehicular meter.
The present invention also provides a kind of for preventing the system of tampering vehicle mileage, and this system comprises:
Collecting unit, for obtaining the mileage record data of vehicle;
Storage unit, for storing mileage record data in vehicular meter;
Backup units, for preserving mileage record data backup;
Electronic control unit, for the mileage record data obtained for collecting unit, obtains proof test value after carrying out data check calculating; Mileage record data backup is formed by mileage record data with after calculating the rear proof test value coded treatment obtained; And when vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from storage unit with the proof test value obtained after the mileage obtained from storage unit and described calculating for the mileage corresponding to mileage record data backup is compared; And
Display unit, for when the comparative result of electronic control unit is all consistent, the mileage that normal display obtains from storage unit; When the comparative result of electronic control unit be at least one inconsistent, display miscue.
According to provided by the invention for preventing the method and system of tampering vehicle mileage, by calculating the proof test value of the mileage record data of vehicle, the mileage record data of backup vehicle, again by the mileage corresponding to mileage record data backup and the mileage obtained from conventional memory location, and the proof test value that obtains afterwards of the described calculating proof test value corresponding with the mileage obtained from conventional memory location compares, can determine that whether the mileage that conventional memory location stores is identical with the mileage of backup, and it is whether corresponding with proof test value, just can judge whether the distance travelled of vehicle is tampered, thus point out user when determining to be tampered, the distance travelled that effectively prevent vehicle is illegally modified, improve the reliability of the distance travelled of vehicle, contribute to assessing vehicle condition.
Accompanying drawing explanation
By reading below in conjunction with the explanation of accompanying drawing to the specific embodiment of the invention, above-mentioned and other feature and advantage of the present invention will become more obvious.Wherein:
Fig. 1 schematically shows the flow process of a kind of method of the distance travelled of illegal tampering vehicle in prior art;
Fig. 2 is for preventing the process flow diagram of a method embodiment of tampering vehicle mileage according to provided by the invention;
Fig. 3 schematically shows the driving mileage data of vehicle and the mileage record data group of proof test value composition;
Fig. 4 according to provided by the invention for preventing the structured flowchart of a system embodiment of tampering vehicle mileage.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 2 shows according to provided by the invention for preventing method embodiment of tampering vehicle mileage.As shown in Figure 2, the invention provides that a kind of the method comprises: in step 101 for preventing the method for tampering vehicle mileage, obtaining the mileage record data of vehicle; In step 102, for obtained mileage record data, after carrying out data check calculating, obtain proof test value; In step 103, will form mileage record data backup after the proof test value coded treatment obtained after mileage record data and calculating and preserve, the memory location of mileage record data backup be different from the conventional memory location of the mileage record data in vehicular meter; In step 104, when vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating for the mileage corresponding to mileage record data backup is compared; In step 105, if all consistent, then normally shown the mileage obtained from conventional memory location by vehicular meter; In step 106, if at least one is inconsistent, then show miscue by vehicular meter.Thus, when the proof test value that the mileage corresponding to mileage record data backup is corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating is all consistent, can determine that vehicle mileage is not tampered, normally can show vehicle mileage; And when the mileage corresponding to mileage record data backup is different from the mileage obtained from conventional memory location or when the proof test value that the proof test value obtained after described calculating is corresponding with the mileage obtained from conventional memory location is different, can determine that the mileage of mileage and the backup obtained from conventional memory location is different or with to calculate the proof test value that obtains not corresponding, thus can judge that vehicle mileage is tampered.
Wherein said verification can be multiple verification such as such as parity checking, Cyclic Redundancy Check etc.The conventional memory location of the mileage record data in described vehicular meter is the memory locations being commonly used to the mileage depositing the vehicle that will show, such as, EEPROM in odometer, mileometer, vehicular meter or other storage area etc.
Step 104 performs when vehicle ignition starts, and to avoid taking more system resource, and just can be tampered by Timeliness coverage vehicle mileage once vehicle ignition startup.
In step 105 and 106, the mileage obtained from conventional memory location can be shown by the LCDs of such as vehicular meter, and miscue can be shown by this LCDs or other devices, such as, normally be shown mileage when vehicle mileage is not tampered by LCDs, shown mistake when vehicle mileage is tampered.
Thus when the proof test value that the mileage corresponding to mileage record data backup is corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating is all consistent, the mileage that can judge conventional memory location not by people as distorting, the mileage obtained from conventional memory location is reliable, at this moment can cross vehicular meter and normally show the mileage obtained from conventional memory location, and vehicle condition can be correctly judged how from the mileage obtained.When any one proof test value that the mileage corresponding to mileage record data backup is corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating or neither consistent time, the mileage that can judge conventional memory location by people as distorting, the mileage obtained from conventional memory location is insecure, at this moment can show miscue by vehicular meter or give a warning, user is learnt, and the mileage of conventional memory location be tampered.
Preferably, mileage record data and proof test value can form mileage record data group as mileage record data backup.Described mileage record data group comprises multiple data block, each data block comprises the mileage byte representing mileage record data, one or more data blocks in described multiple data block comprise check byte, and check byte comprises the proof test value of all bytes before this check byte.
For example, as shown in Figure 3, described mileage record data group comprises 3 data blocks, be designated as data block 1 respectively, data block 2, data block 3, each data block comprises 4 bytes, wherein front 3 bytes of each data block and byte 1 ~ byte 3, byte 5 ~ byte 7, byte 9 ~ byte 11 is the mileage byte (representing with FF in the drawings) representing mileage together, last byte and byte 4, byte 8, byte 12 (uses CRC1 in the drawings for check byte, CRC2, CRC3 represents), front 3 bytes of 3 data blocks are identical, i.e. byte 1, byte 5, byte 9 is identical, byte 2, byte 6, byte 10 is identical, byte 3, byte 7, byte 11 is identical, may be used for the mileage representing vehicle together.Because front 3 bytes of each data block can represent that maximal value is the mileage of 999999km together, be therefore enough by 3 byte representation mileages, in the prior art, last byte and byte 4, byte 8, byte 12 are non-use usually.In the present invention, check byte can be used as by last unused bytes of the one or more data blocks in 3 data blocks.Last byte of 3 data blocks and check byte are designated as CRC1, CRC2, CRC3 respectively, it can be identical, also can be different, described check byte can adopt various algorithm to draw as required, some position any in data block also can be adopted as required to carry out verification and draw.Such as, each check byte is the proof test value of all bytes before this check byte, then CRC1, CRC2, CRC3 can be obtained by following equation:
CRC1=CRC(byte 1 ~ byte 3)
CRC2=CRC(byte 1 ~ byte 7)
CRC3=CRC(byte 1 ~ byte 11)
CRC wherein in equation represents that cyclic redundancy check (CRC) calculates, and other checking algorithms certainly can also be adopted similarly to carry out calculation check value.CRC2 wherein carries out verifying to front 7 bytes comprising CRC1 producing, and CRC2 carries out verifying to front 11 bytes comprising CRC1, CRC2 producing, and has actually passed 3 heavy verify calculation, has considerably increased and crack difficulty.
Like this, due to illegal cracker and do not know check byte adopt which kind of algorithm draw, which do not know according to data to draw yet, therefore when only revising front 3 bytes representing mileage, do not know how to revise check byte, thus the object of tampering vehicle mileage cannot be reached.
Preferably, in a step 102, above-mentioned backup is carried out every predetermined mileage, to save computational resource when forming mileage record data backup.Wherein said predetermined mileage can be arranged according to specific needs, and such as the mileage record data of vehicle upgrade once every 2km usually, then can set and once back up every 2km execution, thus the mileage record data backup formed can be upgraded in time; Or once back up every performing much larger than the mileage of 2km, such as perform every 500km and once back up, thus illegal interpolater is not easy the memory address finding mileage record data backup when the method according to Fig. 1 is by comparing EEPROM and searching the flash address of vehicle mileage, be difficult to amendment mileage record data.
Preferably, when mileage record Data Update, carry out above-mentioned backup, and it is provided by the invention for preventing the method for tampering vehicle mileage from can also comprise: step 107, when comparative result be at least one inconsistent, upgrade the mileage of conventional memory location with the mileage corresponding to mileage record data backup.Thus when determining that vehicle mileage is tampered, the mileage of conventional memory location can be reverted to mileage corresponding to mileage record data backup, avoiding vehicle mileage and be tampered.
According to a kind of embodiment, mileage record data backup can be stored in vehicular meter.Wherein the memory location of mileage record data backup is different from the conventional memory location of the mileage record data in vehicular meter, such as, storer in vehicular meter can comprise multiple storage area, one of them storage area is as the conventional memory location of mileage record data, for storing mileage record data to be shown, and another storage areas different from this storage unit in vehicular meter may be used for mileage record data backup.
Alternatively, mileage record data backup can also be stored in other electronic control units outside vehicular meter, and in other electronic control units one or more that can be stored in outside vehicular meter or connected storage unit.Other electronic control units described can comprise vehicle body control unit, control unit of engine, gear box control unit etc. in such as vehicle.Thus, if illegal interpolater wants to realize distorting object by changing vehicular meter, then owing to all storing mileage record data backup in other electronic control units one or more outside vehicular meter, only change the object that the vehicular meter storing mileage record data can not realize distorting, but need vehicular meter together with all other electronic control units storing mileage record data backup, so just considerably increase the cost distorting mileage, avoid vehicle mileage and be tampered.
The present invention also provides a kind of for preventing the system of tampering vehicle mileage, and as shown in Figure 4, this system comprises: collecting unit 10, for obtaining the mileage record data of vehicle; Storage unit 20, for storing mileage record data in vehicular meter; Backup units 30, for preserving mileage record data backup; Electronic control unit 40, for the mileage record data obtained for collecting unit, obtains proof test value after carrying out data check calculating; Mileage record data backup is formed by mileage record data with after calculating the rear proof test value coded treatment obtained; And when vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from storage unit 20 with the proof test value obtained after the mileage obtained from storage unit 20 and described calculating for the mileage corresponding to mileage record data backup is compared; And display unit 50, for when the comparative result of electronic control unit 40 is all consistent, the mileage that normal display obtains from storage unit 20; When the comparative result of electronic control unit 40 be at least one inconsistent, display miscue.
Preferably, described electronic control unit 40 carries out above-mentioned backup every predetermined mileage and it is stored in backup units 30.
Preferably, described electronic control unit 40 is also for carrying out above-mentioned backup when mileage record Data Update, and at comparative result be at least one inconsistent, with the mileage corresponding to mileage record data backup upgrade in described storage unit 20 store mileage.
Preferably, described backup units 30 is arranged in other electronic control units outside vehicular meter or vehicular meter.Other electronic control units described can comprise vehicle body control unit, control unit of engine, gear box control unit etc. in such as vehicle.
According to a kind of embodiment, described for preventing the system of tampering vehicle mileage from can be vehicular meter, storer wherein in vehicular meter can comprise multiple memory block, one of them memory block is used as the storage unit 20 storing mileage record data, and another storage areas different from this storage area in vehicular meter is used as the backup units 30 of preserving mileage record data backup.
In other embodiments, described for preventing the system of tampering vehicle mileage from comprising vehicular meter and being arranged in the storer of the electronic control unit such as vehicle body control unit, control unit of engine, gear box control unit of the such as vehicle outside vehicular meter.Vehicular meter comprises above-mentioned collecting unit 10, storage unit 20, electronic control unit 30 and display unit 50, and backup units 30 is then arranged in the storer that these are positioned at the electronic control unit outside vehicular meter.
According to provided by the invention for preventing the method and system of tampering vehicle mileage, can learn whether the distance travelled of vehicle is distorted by people in time, and can recover the mileage that be tampered when judging that mileage is tampered, thus prevent coming into force of illegally distorting.And provided by the invention for preventing the method and system of tampering vehicle mileage from not needing the new hardware module of increase just can realize, save production cost.
Although above by some exemplary embodiments to provided by the invention for preventing the method and system of tampering vehicle mileage to be described in detail, but these embodiments above are not exhaustive, and those skilled in the art can realize variations and modifications within the spirit and scope of the present invention.Therefore, the present invention is not limited to these embodiments, and scope of the present invention is only as the criterion by claims.
Claims (10)
1., for preventing a method for tampering vehicle mileage, the method comprises:
Obtain the mileage record data of vehicle;
For obtained mileage record data, after carrying out data check calculating, obtain proof test value;
To form mileage record data backup after the proof test value coded treatment obtained after mileage record data and calculating and preserve, the memory location of mileage record data backup be different from the conventional memory location of the mileage record data in vehicular meter;
When vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from conventional memory location with the proof test value obtained after the mileage obtained from conventional memory location and described calculating for the mileage corresponding to mileage record data backup is compared;
If all consistent, then normally shown the mileage obtained from conventional memory location by vehicular meter;
If at least one is inconsistent, then show miscue by vehicular meter.
2. method according to claim 1, wherein mileage record data and proof test value composition mileage record data group are as mileage record data backup, described mileage record data group comprises multiple data block, each data block comprises the mileage byte representing mileage record data, one or more data blocks in described multiple data block comprise check byte, and check byte comprises the proof test value of all bytes before this check byte.
3. method according to claim 1, wherein said verification is cyclic redundancy check (CRC).
4. method according to claim 1, wherein carries out above-mentioned backup every predetermined mileage.
5. method according to claim 1, wherein when mileage record Data Update, carry out above-mentioned backup, and the method also comprises:
When comparative result be at least one inconsistent, upgrade the mileage of conventional memory location with the mileage corresponding to mileage record data backup.
6. method according to claim 1, wherein mileage record data backup is stored in other electronic control units in vehicular meter or outside vehicular meter.
7., for preventing a system for tampering vehicle mileage, this system comprises:
Collecting unit, for obtaining the mileage record data of vehicle;
Storage unit, for storing mileage record data in vehicular meter;
Backup units, for preserving mileage record data backup;
Electronic control unit, for the mileage record data obtained for collecting unit, obtains proof test value after carrying out data check calculating; Mileage record data backup is formed by mileage record data with after calculating the rear proof test value coded treatment obtained; And when vehicle ignition starts, respectively proof test value corresponding with the mileage obtained from storage unit with the proof test value obtained after the mileage obtained from storage unit and described calculating for the mileage corresponding to mileage record data backup is compared; And
Display unit, for when the comparative result of electronic control unit is all consistent, the mileage that normal display obtains from storage unit; When the comparative result of electronic control unit be at least one inconsistent, display miscue.
8. system according to claim 7, wherein said electronic control unit carries out above-mentioned backup every predetermined mileage and it is stored in backup units.
9. system according to claim 7, wherein said electronic control unit carries out above-mentioned backup when mileage record Data Update, and at comparative result be at least one inconsistent, upgrade with the mileage corresponding to mileage record data backup the mileage stored in described storage unit.
10. system according to claim 7, wherein said backup units is arranged in other electronic control units outside vehicular meter or vehicular meter.
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| CN201410146078.4A CN104978534A (en) | 2014-04-11 | 2014-04-11 | Method and system for preventing vehicle mileage tampering |
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| CN201410146078.4A CN104978534A (en) | 2014-04-11 | 2014-04-11 | Method and system for preventing vehicle mileage tampering |
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