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Abstract
With the development of science technology and
economics, car has been important vehicle that people can
not been without. However, the increasement of the amount
of cars leads to more and more traffic accidents happened.
In these, the pressure of tyre is key factor.
According to SAE (society of automotive engineers),
about 260,000 accidents is caused by the lack of pressure
of tyre. And in china, about 70% accidents are caused by
tyre burst. So, preventing tyre burst has been an
important issue. As far, TPMS is divided into two
kinds—directly and indirectly. In this paper, I select
the first one for its convenience.
In addition, compare of three kinds of sensors is
made. At last, SP12 is chosen. As a kind of sensor used
specially in car, SP12 has a good character. To lower the
power consumption, I choose the mode of awakening by low
frequency. MC33690 is used to transfer a signal with a
low frequency. And this signal is received by a LC
circuit. To support a steady power, ER2450 was used,
which is made by ABLE company. The most of information is
transferred in the mode of wireless. NRF24L01 is used to
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