Where is the tire pressure monitoring device installed?

[DiDakota]

Tire pressure monitoring devices are generally located at the tire valve stem or on the wheel hub. The tire pressure monitoring device automatically monitors tire pressure in real-time while driving and alerts the driver in case of tire leaks or low pressure to ensure driving safety. There are three commonly used tire pressure monitoring methods: Direct tire pressure monitoring: The direct tire pressure monitoring device uses pressure sensors installed in each tire to directly measure tire pressure. It transmits pressure information from inside the tire to a central receiver module via wireless transmitters, then displays the pressure data for each tire. The system automatically alerts when tire pressure is too low or if there is a leak. Indirect tire pressure monitoring: When a tire's pressure decreases, the vehicle's weight causes that wheel's rolling radius to become smaller, making it rotate faster than other wheels. By comparing the rotational speed differences between tires, it monitors tire pressure. The indirect tire alert system essentially relies on calculating the tire's rolling radius to monitor pressure. Tire Pressure Monitoring System (TPMS): It combines the advantages of both systems mentioned above. Direct sensors are installed in two diagonally opposite tires, along with a 4-wheel indirect system. Compared to using only direct systems, this hybrid system can reduce costs and overcome the indirect system's inability to detect simultaneous low pressure in multiple tires. However, it still cannot provide real-time pressure data for all four tires like a direct system.