What is the principle of the tire pressure monitoring system?

[StLayla]

There are two principles of automotive tire pressure monitoring: direct tire pressure monitoring and indirect tire pressure monitoring. Below is an introduction to the principles of tire pressure monitoring: 1. Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire's air pressure. A wireless transmitter sends the pressure information from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. When the tire pressure is too low or there is a leak, the system will automatically alert; 2. The working principle of indirect tire pressure monitoring is: when the pressure of a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in its rotational speed being faster than the other wheels. By comparing the differences in rotational speeds between the tires, the purpose of monitoring tire pressure is achieved. Indirect tire pressure warning systems actually rely on calculating the rolling radius of the tires to monitor air pressure.