Research And Design Of Tire Pressure Monitoring System

As the vehicle industry heats up recent years, the correlative electronic technology has been fully developed and widely utilized. While sudden traffic accidents happen more frequently, the vehicle-safety becomes more notable.When vehicles move at a high speed, the tire fault is a hidden danger and hard to prevent, thus it is the major cause of sudden traffic accidents. As statistics show, 70%-80% of the traffic accidents which happened in superhighway are caused by tire blow-out. How to prevent a tire blow-out has become a key issue in vehicle safety field.As authoritative research indicates, the key to prevent a tire blow-out is maintaining standard tire pressure and detecting tire fault beforehand. Thus, tire pressure monitoring becomes meaningful and important.A vehicle Tire Pressure Monitoring System(TPMS) is designed in the paper. The system monitors tire parameters real-time, and alarms when detecting parameter exception, thus help the driver avoid traffic accidents.After analyzing and comparing various TPMS structures applied currently, the paper proposes a new structure. It bases on direct TPMS, and introduces the LF(low frequency) wake-up mode, and combines the Passive Keyless Entry(PKE) system.The LF wake-up mode solves the tire location detecting problem and the RF(radio frequency) communication confliction problem, which are universal problems in TPMS designing, it greatly improves the RF communication efficiency of the tire module, saves battery energy, and prolongs the life-span of tire module.The PKE system realizes the hands-off door controlling function in vehicle,it accords with the trend of intelligent security-system,and will be a standard equipment in vehicles in the future. By combining TPMS and PKE ,the system realizes the time-sharing reuse function of RF/LF modules, cuts down the hardware cost, and achieves a higher integration.Each part of the system has been analysed and designed in the paper.The crucial technical problems,such as signal collection, RF/LF communication, and code-hopping encryption, has been solved.The hardware and software has been debugged.The experimental results suggest that the system reaches design target in power consumption, commnunication distance and reliability.