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An odometer tells you how many miles/kilometers you have traveled
The old/mechanical type of odometers work by a cable that turns a bunch of gears that create an INCREDIBLE gear ratio. When the cable turns, the cable turns the gear train which therefore turn the numbers. Unfortunately, the great disadvantage of such devices are that they can be roll backwards by using a drill and turning the cable backwards, (or forwards so the numbers can roll back to 0), or just simply driving the car backwards. Also, it's not very accurate.
The newer type of odometers, electronic/computer, work by using two magnets, one attached to the spokes of the wheel, one attached to the car itself. Every time the wheel spins once, the magnets make a close contact and an electric charge is made. A computer inside counts how many contacts are made then calculates the total distance depending on how long the spokes are and how many revolutions were spun.
The above is the same for bicycle odometers, except the computer has to be programmed to the length of the spokes.
For an electronic odometer, it's harder to "rollback" the odometer because the ECU (engine control unit) will store the number. Therefore, if someone tries to "rollback" the number, the stored value in the ECU will disagree; this value can be detected in all car-dealership companies.
The above does not state whether you can hack the ECU so the number will change, or changing the ECU itself with a newer one.
References
- Me
- HowStuffWorks
- Wikipedia
Wiki User
∙ 12y ago
An odometer is a device that measures the distance traveled by a vehicle. It typically works by counting the rotations of the vehicle's wheels and converting that into distance traveled. This information is then displayed on the vehicle's dashboard for the driver to see.
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