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The Principle Of The Instrument Panel
Sep 13, 2017

Speedometer

The traditional speedometer is mechanical, with a typical mechanical odometer connected to a soft shaft, there is a steel cable in the soft shaft, the other end of the soft shaft is connected to a gearbox, the gear rotates and the wire is rotated, the wire cable drives a magnet in the odometer circle, the ring is connected with the pointer and the pointer is placed in 0 digits through the gossamer. The speed of the magnet rotates, which causes the change of the magnetic field, and the balance is driven by the broken pointer. This speedometer is simple and practical, and is widely used in large-size cars. However, with the development of electronic technology, many car meters have already used electronic speedometer, the common one is to get the signal from the speed sensor on the transmission, deflect the pointer or display the number by the change of the pulse frequency.

Odometer

Odometer is a digital instrument, it through the counter drum wheel transmission gear and the speed meter transmission shaft of the worm meshing, so that the counter drum rotation, which is characterized by a first-level drum rotation round, the next level drum rotation 1/10 laps. Like speedometer, odometer also has an electronic odometer, which obtains mileage signals from the speed sensor. The mileage data accumulated by electronic odometer is stored in nonvolatile memory and can be stored in the absence of an electric state.


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