What is the Principle of Tire Pressure Sensors?

[DelGideon]

There are two principles for automotive tire pressure monitoring, as detailed below: 1. Direct Tire Pressure Monitoring. 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. The system will automatically alert when the tire pressure is too low or there is a leak. 2. Indirect Tire Pressure Monitoring. 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 a faster rotation speed compared to other wheels. By comparing the differences in rotation speeds between tires, the system monitors tire pressure. Indirect tire pressure warning systems essentially rely on calculating the rolling radius of the tires to monitor air pressure.