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mechanical to electronic speedometer conversion
Mechanical to electronic speedometer conversion how to do:
1:Just replace the mechanical watch with an electronic watch and install a speed sensor of the same model in the wave box.
2:The shaft of the automobile engine transmits power to the gearbox, and the transmission ratio from the output shaft of the gearbox to the wheels is constant. A "flexible shaft" is installed on the output shaft of the gearbox, which leads to the odometer in front of the driver. The so-called "flexible shaft" is a spiral tube with a steel wire core like the stay wire used for the bicycle brake. There is lubricating oil between the tube wall and the inner core. The outer tube is fixed and the inner core can rotate. The speed of the inner core has a constant proportional relationship with the speed of the wheel.
3:The flexible shaft is connected to the speedometer, so that the pointer can indicate the driving speed of the car. At the same time, the rotation of the flexible shaft is also transmitted to the roller counter in the middle of the speedometer through the worm gear, and the mileage represented by the rotation of the wheel is accumulated. Because the speed and mileage are driven by the rotation action transmitted from the same flexible shaft, the two watches are together, the former is indicated by the pointer, and the latter is accumulated by the roller counter.
The flexible shaft in the purely mechanical speedometer rotates at high speed, and its motion, hysteresis, and the limit of the alternating stress limit of the steel wire. High-speed vehicles often cause fatigue fracture of the steel wire flexible shaft, thus making the function of the odometer invalid. Therefore, the purely mechanical odometer has gradually withdrawn from the market.Compared with the mechanical speed odometer, the mechanical-electronic speedometer mainly replaces the flexible shaft with a sensor, which overcomes the shortcomings of the mechanical speedometer pointer swing, the flexible shaft is easy to break, and the photoelectric pulse or magnetic. The electric pulse signal, after being processed by the microcomputer inside the instrument, can display the vehicle speed on the display screen.The pure electronic speed odometer does not have the error of the vehicle speed and mileage caused by the error between the actual speed ratio and the theoretical speed ratio of the main and passive gears of the odometer, so the indicated reading of the speed odometer is more accurate than the first two.
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