Where is the tire pressure sensor?

[ArielFitz]

The tire pressure sensor is located inside the tire, and depending on the installation position, it can be divided into built-in and external types. The built-in sensor is installed inside the tire, while the external type adds a sensor outside the valve stem. The working principle of indirect tire pressure monitoring is: when the air pressure of a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in its rotation speed being faster than other wheels. By comparing the speed difference between the tires, the purpose of monitoring tire pressure is achieved. The tire pressure monitoring sensor can accurately measure the temperature and pressure inside the tire. Tire pressure monitoring systems can be divided into two types: one is the indirect tire pressure monitoring system, which determines whether the tire is abnormal by the speed difference of the tires; the other is the direct tire pressure monitoring system, which installs four tire pressure monitoring sensors inside the tires.