Abstract：The mass datas indicated that, can greatly reduce the blowout to the tire correct gasification the possibility. In order to solve this problem, tire pressure monitor system (TPMS) the research starts to receive takes. Direct TPMS is in each tire the working pressure sensor, and the installment wireless launcher, transmits the pressure information from the tire interior to the central receiver module in the system. Uses the direct system, may determine each tire interior as necessary the actual pressure, very easy definite breakdown tire.
At present the direct tire pressure monitor system (is decided including 4 or 5 by spare tire whether equips sensor) the tire module and a central receiver module. The tire module by the pressure transmitter, the temperature sensor, the control module (for example ASIC or MCU), the launcher, the antenna as well as the battery is composed. Also may include more external systems in, like the start launch low frequency (LF) the detector, the inertia switch or do not have sets at battery installment and so on power source。
A simple receiver module by a central antenna, receiver IC and the connection which connect with the vehicles other parts is composed. General connection including control territory network (CAN) connection, this connection usual equipment in vehicles automobile body controller. Data by automobile body controller processing, when the tire pressure is low, it may use for to the driver to give the warning.
TPMS (tire pressure monitor system) the function is carries on the real-time automatic monitor in the automobile travel process to the tire pressure, and carries on to tire flat with the low atmospheric pressure reports to the police, guarantees the traffic safety.
This article mainly enlarges to the simulated signal, A/D transforms, as well as the monolithic integrated circuit control demonstration barometric pressure gives detailed introduction showing.
Keyword: TPMS AT89C51 ADC0809 PTR2000
