System and method for monitoring a pneumatic tire
First Claim
1. A transponder for monitoring a pneumatic tire mounted on a conductive wheel and usinq the conductive wheel as an antenna for transmittinq a signal in response thereto, the transponder comprising:
- a generally cylindrical housing having a first chamber adapted for fluid coupling to the pneumatic tire, the housing including a conductive portion for contacting the conductive wheel;
a pressure transducer mounted within the first chamber so as to define a second chamber within the housing, the second chamber being isolated from the first chamber by the transducer;
a generally cylindrical member slidingly engageable with the housing adapted to receive a circuit board and a battery; and
a circuit board disposed within the generally cylindrical member, the circuit board being in electrical communication with the pressure transducer for receiving a first signal therefrom, the circuit board generating a second signal in response to the first signal for transmission from the conductive wheel to a receiver.
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Accused Products
Abstract
A pneumatic tire monitoring system is disclosed which provides a pressure sensor/transponder unit for each pneumatic tire of a vehicle to monitor tire pressure. A coded signal transmitted from each transponder unit is received by a multi-purpose receiver which may provide information to the vehicle operator or to other vehicle systems and subsystems. Each transponder unit is characterized by ultra low power consumption to extend the useful battery life. The transponder units may be mounted within the vehicle tires, or externally mounted. Impedance matching circuitry allows the use of the wheel rims with the transmitting antenna so as to avoid doppler shift induced by the rotating antenna and frequency drift induced by capacitive coupling.
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Citations
11 Claims
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1. A transponder for monitoring a pneumatic tire mounted on a conductive wheel and usinq the conductive wheel as an antenna for transmittinq a signal in response thereto, the transponder comprising:
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a generally cylindrical housing having a first chamber adapted for fluid coupling to the pneumatic tire, the housing including a conductive portion for contacting the conductive wheel; a pressure transducer mounted within the first chamber so as to define a second chamber within the housing, the second chamber being isolated from the first chamber by the transducer; a generally cylindrical member slidingly engageable with the housing adapted to receive a circuit board and a battery; and a circuit board disposed within the generally cylindrical member, the circuit board being in electrical communication with the pressure transducer for receiving a first signal therefrom, the circuit board generating a second signal in response to the first signal for transmission from the conductive wheel to a receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification