Methods of tire pressure monitoring

1. Direct Tire Pressure Monitoring: Direct tire pressure monitoring systems use pressure sensors installed in each tire to directly measure tire pressure. A wireless transmitter sends the pressure information from inside the tire to a central receiver module, which then displays the tire pressure data. The system automatically alarms when 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 air pressure in a tire decreases, the weight of the vehicle causes that tire's rolling radius to decrease, resulting in it rotating faster than other tires. By comparing the difference in rotational speed between the tires, the tire pressure can be monitored. In fact, indirect tire pressure monitoring systems rely on calculating the tire's rolling radius to monitor air pressure.

3. Tire Intelligent Monitoring System (TPMS) Introduction: This system combines the advantages of the two systems mentioned above. It equips direct sensors in two diagonally opposite tires and incorporates a four-wheel indirect system. Compared to using only direct systems, this composite system reduces costs and overcomes the limitation of indirect systems that cannot detect multiple tires simultaneously having low pressure. However, it still cannot provide real-time data on the actual pressure in all four tires like a direct system.