China 
Africa 
Explore chapters and articles related to this topic
Tire Pressure Monitoring Systems: A Case Study in Automotive Mechatronics
Published in Satya Bir Singh, Prabhat Ranjan, A. K. Haghi, Applied Mechatronics and Mechanics, 2020
The second option is based on the pressure sensor (also referred to as direct TPMS). This TPMS system makes use of a pressure sensor which is installed in each tire of the vehicle to measure the tire pressure and that data is shown in driver’s display and monitors the pressure of each tire. These days many cars are fitted with tire pressure sensors. Rapid miniaturization of sensors is an important development in the deployment of TPMS. The four sensors are connected in a wireless sensor network and the tire pressure information is displayed wirelessly. The main goal is to reduce the power consumption of the wireless sensors. This chapter deals with only direct TPMS as described in the next section.
Chassis systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
Direct TPMS means each wheel of the vehicle has a sensor fixed to monitor the changes in pressure from the tyre. They also measure temperature. Each sensor sends its signal to the receiver inside the vehicle using a wireless connection. In Europe, the transmission frequency is 433 Mhz.
Robust estimation method of tire torsional resonance frequency to detect decrease in tire inflation pressure
Published in Vehicle System Dynamics, 2022
TPMS is classified into two types, direct TPMS and indirect TPMS. Direct TPMS measures pressure directly by attaching a sensor within a tire. When the measured pressure is below the threshold value, direct TPMS warns the driver. On the other hand, for vehicles equipped with an Anti-lock Brake System (ABS), indirect TPMS do not require air pressure sensors. In order to determine whether the tire pressure is low, indirect TPMS uses two methods, rotational radius analysis and torsional frequency analysis, with the signals measured from four wheel speed sensors in the ABS.