For safety, almost every car will have ABS, and every wheel will have a sensor. According to the data detected by the sensor (the number of turns of the wheel), the actual speed of the car can be calculated. There is lcd speedometer for sale.
The vehicle speed calculated in this way should be accurate, but why is it still not in line with the actual vehicle speed? Since the value should be accurate and different from the actual vehicle speed, there is only one situation: the speedometer is set deliberately. Indeed, there is such a national standard-"Automobile Speedometer" (GB15082-2008), which stipulates that the speed displayed on the car speedometer must be greater than the actual speed. The specific gap ranges are as follows:
For example, if the actual speed of the car is 60km/h, then the range displayed by the speedometer must be between 60km/h and 70km/h. By analogy, if the actual vehicle speed is 100km/h, the range displayed by the speedometer is between 100km/h and 114km/h.
If this is the case, doesn't it mean that we can increase the speed a bit, even faster than the speed limit? Friends who have this kind of thinking hurry to stop. The error between the speedometer speed and the actual speed is only a range. You don’t know how much it is. Speeding at will is not only unsafe, it is also easy to deduct points and fines, so don’t use this. Click to speed deliberately.
So is it possible that the actual vehicle speed is faster than the speed indicated by the speedometer? Of course, it is also possible. As mentioned above, the actual vehicle speed is calculated by detecting the number of turns of the wheel, and the wheel diameter in the calculation is the factory value.
If you change to a tire with a larger wheel, if the tire thickness is the same, C=πd, the diameter increases, the tire circumference will naturally increase, and the distance will be longer under the same number of laps, and the actual speed will naturally be faster. Up. In this way, the speed displayed by the speedometer will be slower than the actual speed. Deviations in the speed of the vehicle cannot be a reason for us to try to speed. It is a good habit to drive civilly without speeding.
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