The current odometer reading data of at least one further control unit is then stored on the data bus in a storage means. The control units transmit the odometer reading data, which is stored at a particular time, onto the data bus at specific time intervals, and a control unit accepts the odometer reading transmitted onto the data bus if that reading is higher than its stored value, and uses that value for the further counting and storage in the particular control unit.
This application claims the priority of German Application No. The invention relates to a method for the tamper-proof storage of the odometer reading in a vehicle.
The tamper-proof storage of a distance covered by a vehicle is very important. Recently, insurance companies have attempted to make their premiums for vehicles dependent on the distance which they travel annually. In addition, the odometer reading is a decisive factor in determining the price when a secondhand car is bought or sold. In addition, the method which is used when writing to the nonvolatile memory permits checking for faults to be carried out by setting and comparing an additional parity bit for each stored data value.
Here, the significant digital value of an odometer reading is set as an address pointer for the nonvolatile memory in which the non-significant digital value of the odometer reading is then stored.
In addition, electronic tampering with odometer reading data is prevented in that, during writing, an additional flag is set which cannot be deleted and is additionally checked.
German Patent No. DE discloses a method and a device for the tamper-proof storage of odometer reading data of a vehicle. Here, the data which is determined by a counting unit is transmitted in encrypted form to a receiver unit. In the receiver unit the data is encrypted and stored. Japanese Patent No. In order to prevent misuse, when the non-volatile memory is tampered with at the start of the process part the odometer reading information contained there is written back into the non-volatile memory.
The object of the present invention is to make available an alternative method for the tamper-proof storage of odometer reading data. Here in particular the protection against errors during the transmission of the odometer data is improved. The object is achieved according to the invention by storing the current odometer reading data of at least one further control unit on the data bus in a memory.
The control units transmit the odometer reading data, which is stored at a particular time, onto the data bus at specific time intervals. A control unit accepts the odometer reading transmitted onto the data bus only if the reading is higher in value than its stored value. This value is used by the control unit for the further counting and storage. The redundant storage of the odometer reading data in the further control units enhances the protection against tampering. Possible tampering would then have to be carried out not only in the first control unit but also in the further control units.
As tampering with the odometer reading data generally has the objective of reducing the odometer reading data, the method ensures that the odometer reading, having the highest value transmitted on the data bus, is always stored by the storage means of the control units. In this way, when tampering which occurs with the odometer reading data at one of the control units, this tampering is prevented from being spread to the other control units. In addition, when a control unit is changed it is not necessary to reset the odometer reading.
The correct value is automatically accepted by the new control unit when this method is applied. Post Reply. Perhaps I missed it in the previous thread about the gentleman who had his odometer suddenly drop k miles when he disconnected and then reconnected his battery, but is there an official answer to whether the ecm stores the mileage along with the cluster. If not, then HOW did his mileage change after he reconnected the battery?
I've been trying to figure out a solid answer to this question for a while now. I've got a very low mileage tacoma 48k miles that I've always been just a tiny bit suspicious about probably just paranoid. The only records my truck came with were inspection printouts for every year since new. They all list the mileage. Each year the mileage increases between 1k and 2k. I've always wondered if the dude just disconnected the odometer for a majority of the year then reconnected it for 1k miles or so and then had it inspected as not to raise any eyebrows.
If the mileage were stored on the ecm, I should be able to check it against what the cluster reads. IFGD , Aug 22, Gauges can be calibrated by hand when the cluster is turned off. Calibrate the gas gauge when the gas light turns on. The odometer does not roll over to 1 million kilometers. But the trip computer still works, as you can see here, I drove just over a kilometer to see what would happen. Just a thought. Question 1 year ago on Step Question 1 year ago on Introduction.
I have a honda accord and my speedometer is missing can a new one be used or it has to be programed also how do'es that proces works? Question 2 years ago on Step 3. Question 2 years ago on Step 6. Okay so if you could I would love to talk to you about decoding an eeprom file from certain clusters and how you do it.
Or how do you identify which is what? Question 2 years ago on Introduction. I don't want to loose my mileage and obviously i don't want my odometer to read in km while it supposed to read in miles. Thank you. Question 3 years ago. Any help would be appreciated. Thanks charles. Question 3 years ago on Introduction. Hi sir I have model mahindra thar m2dicr. It's odometer has no eeprom how to change its mileage.
I like the idea of recording 'exact' mileage of vehicle. It's always interesting to see just how far you can go. Nice write up on reading, decoding, and writing the odometer. I'm planning on doing the same thing to, but to a different make and model vehicle. I bought a used BCM and the mileage on the car went from 96k to 32k. The dealer refused to reprogram the BCM even though GM built in a one time mileage update feature for someone like me.
Henrick Top Post Dawg. It is stored in instruments cluster - the actual part where your speedo and tacho is. When swapping ECUs, your bigger conecrn might be mating the immobilizer. It's stored in both, visually though you will only see the mileage shown on the gauge clusters but I believe it's also stored on the ecu for the reason being to compare it against the cluster, for tampering reasons, I believe anyway.
I could be wrong, but it is written in both locations. VW does the same thing
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