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old cars with digital speedometer
Such as BMW, such as Volkswagen. Now most cars have digital speed display. In fact, the technology has been improving since the development of automobiles. In the early days, the analog instruments, namely mechanical instruments, can display the current speed of automobiles more intuitively and accurately. If the analog instrument is to be converted into digital signal, the analog instrument has been used until now due to the limitation of the acquisition accuracy, real-time, reliability and cost of the sensor in the early stage.
The specific steps for the car odometer to change the number are as follows: 1. Find the odometer sensor plug on the gearbox or transmission shaft at a different position on the car clutch housing and gently pull it out by hand; 2. Then insert the output plug of the meter walker into the signal socket in the pulled sensor plug; 3. Insert the meter walker into the cigarette lighter accurately; 4. Turn on the car key and rotate it. Just adjust the small adjusting button on the meter walker to adjust the speed of the car to the desired speed; 5. The number will automatically advance a lot when you start working. About 8 hours can automatically increase the distance of 3000 kilometers; 6. Special attention: It is better to try one jack. Don't try every one to make sure it is the signal cable jack. Otherwise, the meter reader will fail.
You can also change the old car speedometer to digital speedometer:
Just replace the mechanical watch with an electronic one and install a speed sensor of the same model in the wave box. The shaft of the automobile engine transmits power to the gearbox, and the transmission ratio from the output shaft of the gearbox to the wheel is constant. A "flexible shaft" is installed on the output shaft of the gearbox, which goes all the way to the odometer in front of the driver. The so-called "flexible shaft" is a spiral tube with a steel wire core, like the 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 rotation speed of the inner core has a constant proportional relationship with the rotation speed of the wheel. The flexible shaft is connected to the speedometer so that the pointer can indicate the driving speed of the vehicle. 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 worm to accumulate the mileage represented by the rotation of the wheel. Because the speed and mileage are driven by the rotation action transmitted by the same flexible shaft, the two tables are together, the former is indicated by the pointer, and the latter is accumulated by the roller counter.
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