How Does a Tire Pressure Sensor Work?
2 Answers
Tire pressure sensors operate differently depending on the type of tire pressure monitoring system: 1. The working principle of direct tire pressure monitoring sensors is: using a wireless transmitter to send pressure information from inside the tire to a central receiver module, which displays the air pressure data of each tire; 2. The working principle of indirect tire pressure monitoring sensors is: when the air pressure of a tire decreases, the vehicle's weight causes the rolling radius of that wheel to become smaller, resulting in its rotational speed being faster than other wheels. Tire pressure sensors are installed at the valve stem position or inside the tire, forming a simple tire pressure monitoring system that utilizes the ABS sensing function to compare the number of rotations of the tires. A tire with insufficient pressure will have a shorter circumference, and if one of the four tires has insufficient pressure, its rotation count will differ from the others during driving.
The working principle of tire pressure sensors is quite interesting, mainly relying on small internal components to achieve pressure monitoring. These sensors are usually installed on the inner wall of the tire or the valve stem, containing a tiny pressure-sensing element that can continuously detect changes in the tire's internal pressure. When the pressure is too high or too low, this element triggers a wireless signal through a circuit, using radio frequency (RF) technology to send the data to the vehicle's receiver. The receiver then relays the information to the dashboard, and the warning light turns on, reminding you to check the tire pressure. The entire system is powered by a small battery, but the battery may deplete after a few years, so regular replacement is necessary. Sometimes, the signal can also be affected by interference, such as in tunnels or areas with high electrical interference, leading to inaccurate data. This design enhances driving safety by helping to prevent tire blowouts.
