What is the working principle of the tire pressure monitoring system in Golf 7?

[AuroraMarie]

Golf 7's tire pressure monitoring principle is: By utilizing ABS sensors to compare the rolling circumference and rotational speed of each vehicle's wheels. If the tire pressure of one or more wheels changes, the tire pressure loss indicator in the combination instrument and infotainment system display will issue an alert. Golf 7 refers to the seventh-generation product of the Golf. In terms of body dimensions, the Golf 7 measures 4255mm in length, 1799mm in width, and 1452mm in height, with a wheelbase of 2637mm. The Golf 7 is equipped with EA211 series 1.6L and 1.4T engines, featuring a MacPherson strut front suspension and a torsion beam rear suspension.

[Francisco]

After driving for so many years, I've studied quite a few tire pressure monitoring systems. The Golf 7 uses an indirect TPMS. Instead of installing pressure sensors directly in the tires, it utilizes the ABS wheel speed sensors to compare wheel rotation speeds. When each wheel spins, their speeds should be roughly the same; but if a tire's pressure is low, its diameter decreases slightly, causing it to rotate faster to keep up with the others. The system continuously monitors this speed difference in the background. Once it detects that a wheel is rotating significantly faster than its counterparts, it immediately illuminates the tire pressure warning light on the dashboard to alert you of a pressure issue. This method is cost-effective and space-saving since it reuses ABS hardware, but its drawback is frequent false alarms—for example, load imbalance during sharp turns can also trigger false warnings. I've experienced this on the highway: the warning light flashed, startling me into pulling over immediately, only to find a nail causing a slow leak in the tire. During routine maintenance, remember to manually check the tire pressure frequently to calibrate the system.

[JaceMarie]

In my daily commute with the Golf 7, I really like the design of its tire pressure monitoring system. Simply put, it guesses pressure issues based on changes in wheel speed. The system uses ABS sensors to check if the wheel rotation speeds are consistent. A tire with lower pressure has a slightly smaller diameter, causing it to rotate faster. If the system detects a deviation, it alerts you. When the warning light on the dashboard comes on, you might need to pull over to reset or check it. I remember once before a long trip, the pressure was normal, but after two hours of driving, the light flashed. After checking for a while, I found out the right front tire had a puncture. This method is convenient but not precise—it can't specify which tire is faulty, and after changing a tire, you still need to manually recalibrate it. Personally, I think it's better to keep a digital tire pressure gauge in the car to get accurate readings immediately after an alarm.

[DylanLee]

I understand that the Golf 7 tire pressure monitoring system operates on an indirect principle. It doesn't measure air pressure directly, but rather uses wheel speed sensors to make determinations. Under normal conditions, the rotation speeds of the wheels should be synchronized. However, low tire pressure can cause a wheel to rotate slightly faster, and the system detects this discrepancy to alert the driver. For example, the warning light will illuminate when there's a leak. A drawback is that it might give false alarms during high-speed cornering.