REMOTE TIRE PRESSURE MONITORING SYSTEM EMPLOYING CODED TIRE IDENTIFICATION AND RADIO FREQUENCY TRANSMISSION, AND ENABLING RECALIBRATION UPON TIRE ROTATION OR REPLACEMENT

摘要

A system for indicating low tire pressure in vehicles, in which each vehicle wheel has a transmitter (100) with a unique code. Acentral receiver (200) in the vehicle is taught, at manufacture, to recognize the codes for the respective transmitters (100) for the vehicle, andalso a common transmitter code, in the event one of the transmitters (102) needs to be replaced. During vehicle operation and maintenance,when the tires are rotated, the system can be recalibrated to to relearn the locations of the transmitters. The transmitters (100) employsurface acoustic wave (SAW) devices (110). An application specific integrated circuit (ASIC) encoder (130) in each transmitter (100) isprogrammed at manufacture, in accordance with its unique code, to send its information at different intervals, to avoid clash between twoor more transmitters (100) on the vehicle. The transmitters (100) are powered by long-life batteries.