Tire Pressure Sensor (TPMS)

Tire Pressure Sensor (TPMS) Did you know by early recognition that a tire is under-inflated or any tire malfunction we can totally avoid traffic accidents? According to U.S. Government Accountability Office or US GOA, underinflated tire impact a driver´s ability to control a vehicle against skidding, blowouts, and other tire failures. Under inflated tires contributed to 247, or 0.8percent, of 32,061 fatalities and 23,100, or 0.8 percent, of almost 3 million injuries. In addition, U.S. Department Of Transportation or NHTSA estimates that 41 vehicular-related deaths occur annually because of blowouts alone from under inflated tires. Moreover, tire that are not inflated to the appropriate pressure result in a slight decline in fuel economy. Due to these issues, the federal government recommends using a tire pressure gauge to check pressure regularly and re-inflate tires to maintain proper inflation. Also, tire pressure monitoring systems (TPMS) equipment for passenger cars and light trucks will alert drivers when a tire’s pressure falls 25 percent below a vehicle manufacturer’s recommended level or minimum activation pressure specified in the regulations, whichever is higher. TPMS also help in reducing CO2 emission and reducing tire abrasion by an optimal inflation.

There are two types of Tire Pressure Monitoring System that are currently available – Direct TPMS and Indirect TPMS. A direct TPMS sensor consists of following main functions requiring only a few external components (e.g. battery, housing, PCB) to get the sensor module which is mounted to the valve inside the tire: Pressure sensor, Analog-Digital Converter, Microcontroller, System Controller, Oscillator, Radio Frequency Transmitter, Low Frequency Receiver and a Voltage regulator (battery management). By employing physical pressure sensors inside each tire, Direct TPMS process and send information to a central processing unit (cpu) in the vehicle. These systems can recognize simultaneously under-inflation in all four tires in any combination. Direct TPMS are specifically designed to cope with temperature changes which influence the tire pressure. The pressure thresholds for the warning activation are usually derived from the manufacturers recommended “cold placard inflation pressures”. In order to transfer the data from a rotating wheel, a direct TPMS use a radio frequency communication channel. The other type of system is the Indirect TPMS which do not use physical pressure sensors. Indirect TPMS determines a deviation of an under-inflated tire due to its higher rotational speed. It is not concrete whether the Indirect TPMS will be accurate enough to achieve the objective of the mandatory regulations.
A little investment for our safety is very important. We are not only saving our money by reducing gas consumption but we are also protecting our family and thinking of their safety by riding a well maintained vehicle.

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