| 摘要 |
Tire pressure monitors are incorporated in vehicles having pneumatic tires to continuously or periodically measure the air pressure in the tires and to alert the driver should the pressure in one of the tires fall below a predetermined value. A self-contained generator-transmitter unit is affixed to each wheel, each unit monitoring the air pressure in the tire associated therewith and generating an RF signal when the pressure falls below a predetermined value. A receiver, located in the passenger compartment of the vehicle, receives the signal(s) from the generator-transmitter units to indicate a low tire condition to the vehicle operator. The generators operate only during rotation of the wheels which effect relative rotation between two members in each generator, one member carrying a permanent magnet and the other carrying an inductor. The member carrying the inductor is mounted to a wheel and the second member is mounted for rotation proximate the first member, having a mass center which is displaced from the axis of the first member, resulting in a pendulum or vertical position seeking affect.
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