What is the principle of the built-in tire pressure monitoring?

[Catherine]

Built-in tire pressure monitoring in cars can be divided into two types: direct tire pressure monitoring and indirect tire pressure monitoring. The difference lies in that direct monitoring can display specific tire pressure values, while indirect monitoring only alerts when there is a problem with the tire pressure. Below is an introduction to the two types of tire pressure monitoring: 1. Direct tire pressure monitoring uses pressure sensors to directly measure tire pressure: The direct tire pressure monitoring device uses pressure sensors installed in each tire to directly measure the tire pressure. It then sends the pressure information from inside the tire to a central receiver module via a wireless transmitter, displaying 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. Indirect tire pressure monitoring detects when a tire's pressure drops, causing its rolling radius to decrease and its rotation speed to become faster than other wheels: The working principle of indirect tire pressure monitoring is that when the pressure of a tire decreases, the vehicle's weight causes the rolling radius of that wheel to become smaller, resulting in its rotation speed being faster than other wheels. By comparing the differences in rotation speeds between tires, the system monitors the tire pressure. The indirect tire pressure alert system essentially relies on calculating the rolling radius of the tires to monitor the pressure.