Indirect Tire Pressure Monitoring System

There are two kinds of wireless tire pressure monitoring systems: direct and indirect. Both of them can tell you the tire situation in real-time: underinflated, correct, and over-inflated. Also, they can monitor the temperature data of tires to avoid the overheating issue. When the sensors detect the incorrect tire situation, they start to warn the driver preventing the small inconvenience from becoming a nightmare.

Indirect tire pressure monitors:

Generally, a direct tire pressure monitoring system provides more detailed and accurate data and better warning to drivers than indirect tire pressure sensors. The indirect tpms has an indirect monitoring method: it monitors the tire pressure by checking the changes in the rotational speed of tires. If one of the tires becomes underinflated, the rotational radius will become different. The load will fall gradually onto the underinflated tires, and the rotational radius of this tire gets smaller. Thus the speed of this tire is getting slower. The car’s antilock braking system’s wheel speed sensors will detect the difference and warn the drivers of the lower tire pressure alert by showing the alert on the dashboard display or anything else. The connection is under-inflation of one of the tires—–the load this tire carries becomes more——- rotational radius changes—–speed of tires becomes slower——- sensed by wheel speed sensors by comparing it with other tires—alert generated.

Weaknesses of indirect tire pressure monitor:

An indirect tire pressure monitoring system doesn’t offer data like pressure readings and temperature and also does not warn you of which tire is not correct in tire pressure. Thus if the four tires drop the almost same tire pressure, the indirect tire pressure monitoring system would be blind in this situation. Indirect being blind does not mean this is normal, actually it is also dangerous since it’s related to the underinflation for 4 tires! Also, indirect tpms has a very high rate of false alerts of underinflated tires. One user’s car usually generates the lower tire pressure, but when he went to the repair shop or 4S shop to check, the guy told him the tire pressure was correct after careful checks. These false alarms bother his daily life. It becomes beeping if a lower tire pressure alarm occurs. However, he is not authorized to turn off the beeping alert. The only way to turn off the underinflated alert is to go to the authorized 4S shop. The professional staff canceled the alert after a conventional check. Also, the alert is controlled by the central server, and can’t be dismissed by anyone else. These complicated formalities take time. At last, he decided to take the indirect tpms away from his car.