English 
what does speedometer mean
The speedometer is composed of a speedometer that indicates the speed of the car and an odometer that records the distance traveled by the car. It is divided into three types: pure mechanical type, mechanical-electronic type, and pure electronic type."Mai" = mile, "Mai" is the transliteration of English mile (mile);mile A unit of length equal to 5,280 feet or 1,760 yards (1,609 meters);
A speedometer consists of a speedometer, which indicates how fast the car is traveling, and an odometer, which records the distance traveled by the car.
The car speedometer is divided into two types: roller counter and dot-distance LCD screen. It consists of a speedometer that indicates the speed of the car and an odometer that records the distance traveled by the car. The two are installed in a common housing and are composed of driven by the same shaft. Ordinary speedometers are generally magnetic induction type. There are three types of speedometers: purely mechanical, mechanical-electronic and purely electronic. The flexible shaft in the purely mechanical speedometer rotates at high speed, and its motion hysteresis is limited by the alternating stress limit of the steel wire. Vehicles traveling at high speed often cause fatigue fracture of the steel wire flexible shaft, thus making the function of the odometer invalid. Purely mechanical odometers have been slowly withdrawn from the market.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 and the flexible shaft easily broken. The electric pulse signal, after being processed by the microcomputer inside the instrument, can display the vehicle speed on the display screen. The odometer calculates and displays the mileage according to the vehicle speed and accumulated running time. The vehicle speed sensor is connected to the outside of the driven wheel of the mechanical odometer. It is in direct contact with the driven wheel. The pure electronic speed odometer has no error between the actual speed ratio and the theoretical speed ratio of the main and passive gears of the odometer, resulting in the error of the vehicle speed and mileage. The two are more accurate, and there are fewer transmission parts in contact with each other, and the damage rate and cost are reduced, so they are widely used in the automotive industry.
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