What is the principle of the built-in tire pressure monitoring system in cars?
2 Answers
The principle of the built-in tire pressure monitoring system in cars is that when the car starts moving, the acceleration sensor first sends a signal to the receiver, and then transmits the monitored tire pressure and temperature signals together to the receiver. Once the receiver receives the signal, it immediately displays the information. Here are the relevant details: 1. While the car is in motion, the wireless tire pressure monitor's sensor checks the data every 4 seconds. If no abnormalities are detected, it sends data to the receiver every 20 seconds to conserve power. If an abnormality is detected, it sends data to the receiver every 4 seconds. 2. The tire pressure monitoring system consists of a main unit and sub-units: the main unit is installed inside the car, receiving signals from the sub-units and promptly issuing alarm information. 3. The sub-units are installed on the four wheel hubs, integrated with the valve stems and tightly attached to the hubs. During installation, the original valve stems are usually replaced. The sub-unit modules monitor the tire pressure of each tire and send relevant information to the main unit.
As an old hand who has driven for many years, let me talk about tire pressure monitoring. The system in the car usually monitors tire pressure in two ways: the direct method and the indirect method. The direct method involves a sensor inside the tire, like a small chip, mounted on the valve stem or attached to the wheel rim. It measures the air pressure in real time and then transmits the data to the car's computer via wireless signals—usually radio frequency or Bluetooth. The computer triggers a warning light if it detects low pressure. The indirect method, on the other hand, uses the car's ABS system sensors to monitor the rotational speed of each tire. Since a tire with low pressure rotates slower, the computer can compare the speeds and identify which tire has an issue. I must remind you that regular checks are crucial. The sensor batteries can last several years but will degrade over time, and failing to repair them promptly may lead to false alarms. This system is a real convenience. Back in the day, we had to kick the tires and guess, but now driving feels much safer.
