How to Read a Car Tire Pressure Gauge?
1 Answers
Tire pressure gauges are generally divided into three types: analog (dial) tire pressure gauges, digital tire pressure gauges, and alarm-type tire pressure gauges. The latter two can display tire pressure through numerical values or alarms, and their principles are relatively simple. However, analog tire pressure gauges need to be connected to the tire valve stem to check the car's tire pressure, and then the tire pressure can be read by observing the pointer on the gauge head. There are three commonly used methods for tire pressure monitoring: Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire's air pressure. The pressure information is transmitted from inside the tire to a central receiver module via a wireless transmitter, and then the tire pressure data for each tire is displayed. When the tire pressure is too low or there is a leak, the system will automatically issue an alarm. Indirect Tire Pressure Monitoring: When the air pressure in a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in a faster rotation speed compared to the other wheels. By comparing the differences in rotation speeds between the tires, the purpose of monitoring tire pressure is achieved. Indirect tire alarm systems actually rely on calculating the rolling radius of the tires to monitor air pressure. Introduction to Tire Pressure Monitoring System (TPMS): It combines the advantages of the two systems mentioned above. Direct sensors are installed in two diagonally opposite tires, and a 4-wheel indirect system is also equipped. Compared to using only a direct system, this hybrid system can reduce costs and overcome the limitation of indirect systems, which cannot detect when multiple tires simultaneously have low air pressure. However, it still cannot provide real-time data on the actual pressure in all four tires as a direct system does.
