What is Passive Tire Pressure Monitoring?
2 Answers
Passive tire pressure monitoring is an indirect tire pressure monitoring system that utilizes the wheel speed sensors of a vehicle's ABS anti-lock braking system to compare the rotational speed differences between tires, thereby achieving the purpose of monitoring tire pressure. The indirect tire pressure warning system essentially relies on calculating the rolling radius of tires to monitor air pressure. The ABS system determines whether a wheel is locked by using wheel speed sensors, and then decides whether to activate the anti-lock braking system. When tire pressure decreases, the vehicle's weight causes the tire diameter to become smaller, resulting in changes in vehicle speed. These speed changes trigger the tire pressure monitoring alarm system, alerting the driver to insufficient tire pressure.
Passive tire pressure monitoring is a system that indirectly checks tire pressure through the vehicle's anti-lock braking system (ABS), eliminating the need for additional sensors on the tires. Having driven for many years, I frequently rely on this system, which primarily uses ABS wheel speed sensors to monitor the rotational speed changes of each tire. If a tire's pressure is low, that tire will rotate slightly faster, and upon detecting this discrepancy, the system triggers a warning light on the dashboard to alert you to check the tire pressure. This method is quite practical, especially during long-distance driving or in variable road conditions, as it helps prevent potential blowout risks in a timely manner. However, it is less precise than active tire pressure monitoring, as it cannot display specific pressure values and only alerts when an issue arises. I recommend that drivers still manually check tire pressure regularly to ensure safety, particularly in winter when temperature fluctuations can significantly affect tire pressure.
