TPMS Sensor Description and Operation

Description

1. 1
   General Description: The WU is a sensor mounted inside the tire that reports pressure and temperature. The WU is mounted inside the wheel and fixed to the valve. The angle between the valve and the WU body is variable, which allows adaptation to different wheel types. The wheel unit consists of a printed circuit board supporting the electronic equipment, enclosed in a housing filled with polyurethane. It is powered by a battery and includes all systems for parameter measurement (pressure, temperature and centrifugal acceleration, and optionally rotation direction), radio frequency transmission and low frequency detection. To achieve the specified battery life, the WU supports various measurement and transmission timings depending on the WU operating mode. For radio frequency transmission, the WU uses an internal antenna.
2. 2
   First Block Mode: When the vehicle starts moving, the sensor enters first block mode. The typical radio emission period is 16 seconds, 40 times for auto learn and automatic location function.
3. 3
   Driving Mode: After 19 minutes of parking, and then finishing, the first block mode and WU mode enter driving mode. The typical radio emission period is 64 seconds when vehicle speed is above 4 g.
4. 4
   Parking Mode: When vehicle speed is below 3 g, the system enters parking mode. The typical radio transmission period is 13 hours.