How many types of ABS tire pressure monitoring principles are there?
2 Answers
There are two types of ABS tire pressure monitoring principles: direct tire pressure monitoring systems and indirect tire pressure monitoring systems. The direct tire pressure monitoring system uses pressure sensors installed in each tire to directly measure the tire pressure. It then transmits the pressure information from inside the tire to a central receiver module via a wireless transmitter, displaying the tire pressure data for each tire. The system automatically alerts when the tire pressure is too low or there is a leak. The indirect tire pressure monitoring system works by detecting when a tire's pressure decreases, causing the vehicle's weight to make that wheel's rolling radius smaller, which results in its rotation speed becoming faster than other wheels. By comparing the differences in rotation speeds between tires, it achieves the purpose of monitoring tire pressure.
I've been driving for over twenty years and am very familiar with various tire pressure monitoring systems. The ABS-based tire pressure monitoring mainly uses an indirect method, where the system utilizes the ABS wheel speed sensors to compare wheel rotation speeds. When a tire is underinflated, its diameter decreases, causing its rotation speed to increase. The ABS control module detects this discrepancy and illuminates a warning light to alert you. This method is cost-effective as it doesn't require additional sensors inside the tires, but it has drawbacks like occasional false alarms—for instance, it can't detect when all tires are losing pressure. I remember once when the warning light came on during high-speed driving, and after pulling over, I found the right rear tire was indeed low on air—this system really saved the day. Nowadays, I always recommend manually checking tire pressure regularly, about once a month, to ensure tire condition. Safety comes first, and though this technology seems small, its impact is huge. Some older car models rely solely on this, while newer models sometimes combine it with more advanced direct systems.
