Tire pressure monitoring is very important in the process of automobile driving. When the tire pressure is too high, the contact area between the tire and the ground will decrease. At this time, the pressure on the tire is relatively increased, and the grip of the tire will be affected. In addition, when vehicles pass through ditches or bumpy roads, there is not enough spare space in the tires to absorb vibration, which will not only affect the driving stability and ride comfort, but also increase the impact on the suspension system and bring harm. At the same time, the hidden danger of puncture at high temperature will increase accordingly. There are two main types of tire pressure monitoring: direct tire pressure monitoring and indirect tire pressure monitoring. The direct tire pressure monitoring device uses the pressure sensor installed on each tire to directly measure the tire pressure, uses the wireless transmitter to send the pressure information inside the tire to the central receiving module, and then displays the tire pressure data. When the tire pressure is too low or leaks, the system will automatically give an alarm. The working principle of indirect tire pressure monitoring is that when the air pressure of one tire decreases, the rolling radius of the wheel will decrease due to the weight of the vehicle, resulting in its rotating speed being faster than other wheels. By comparing the speed difference between tires, tire pressure can be monitored. The indirect tire warning system actually monitors the air pressure by calculating the tire rolling radius.
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