English 
speedometer showing faster speed
The stopwatch of the car uses the sensor fixed in the inner tube of the vehicle to measure the distance traveled by the vehicle, and adds the circumference of the tire to calculate the speed of the vehicle. There are several reasons why the speedometer of the car is 30 kilometers faster than the actual speed. The reason why the speedometer is inconsistent with the actual speed is that the tires are insufficiently inflated, the tires are severely worn, and the vehicle is driven at a super high speed. Under-inflated tires: Under-inflated tires reduce the effective radius of the tire, which in turn affects the circumference. The speed calculator will not adaptively reduce the girth value according to the set girth. If the tires are under-inflated, the speed indicator on the car dashboard will be greater than the actual driving speed. Severely worn tires: For severely worn tires, if the circumference decreases, the measured speed will be higher than the actual driving speed, so it is not recommended to use severely worn tires to drive on the road. Ultra-high-speed driving: When the vehicle is running at ultra-high speed, it will not only face a lot of wind resistance, but also face a lot of downforce. The radius and diameter of the wheel will be reduced, resulting in the measured speed being higher than the actual driving speed.
The car calculates the distance by the number of revolutions of the tires, and adding the time can get the speed per hour. The factory setting is calculated based on the standard tire pressure (such as 2.4).Another situation is that there is a problem with the instrument parameter data. In this case, the computer can be used to reset the instrument value. In addition, the data value in the instrument is based on the value in the ABS. In this case, check whether the data in the ABS is on the standard parameter value. Again, it is necessary to consider the signal interference caused by the installation and modification of the line, or the corrosion and short circuit of the line.
There are many advantages to indicating that the speed of the vehicle is greater than the actual speed. For example, on a road section with a speed limit of 120Km/h, some drivers will drive the car to more than 110km/h, which is very close to the speed limit. If the indicated speed is equal to the actual speed, then this If you operate a car carefully, you may overspeed. The manufacturer has reserved a certain space in the setting, even if the car is accidentally driven to a little over 120, it will not be illegal. Therefore, this setting is very beneficial for the driver to control the speed of the vehicle. Although we know that the display of the speedometer will be higher than the actual speed, it does not mean that you can speed up when driving. After all, speeding is very dangerous, and the manufacturer's settings are also based on safety considerations to a certain extent.
Get a Quote / Info