Method and apparatus for identifying remote sending units in a tire pressure monitor system of a vehicle using secondary modulation of wheel rotation
First Claim
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1. A method for a receiving unit in a remote tire monitor system of a vehicle, the method comprising:
- receiving radio signals transmitted by sending units associated with wheels of the vehicle; and
positioning a transmitting sending unit on the vehicle based on variation in the radio signals associated with movement of the transmitting sending unit.
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Abstract
A remote tire monitoring system (10) includes tire monitors (12) positioned at respective wheels of a vehicle (V) for transmitting radio signals modulated by tire data and modulation means positioned above near the tire monitors for imposing a secondary modulation on the radio signals. A receiver (14) receives the radio signals and recovers the tire data (26) from the radio signals and associates the tire monitor with the respective wheels of the vehicle using the secondary modulation.
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Citations
12 Claims
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1. A method for a receiving unit in a remote tire monitor system of a vehicle, the method comprising:
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receiving radio signals transmitted by sending units associated with wheels of the vehicle; and
positioning a transmitting sending unit on the vehicle based on variation in the radio signals associated with movement of the transmitting sending unit. - View Dependent Claims (2, 3, 4, 5)
comparing the variation in the radio signals with stored data; and
when a particular variation matches stored data, associating a vehicle position for the transmitting sending unit with a stored position for the stored tire information.
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3. The method of claim 1 further comprising:
recovering tire data from the received radio signals.
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4. The method of claim 3 wherein positioning the transmitting sending unit comprises:
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comparing the variation in the radio signals with stored data; and
based on the comparison, associating the tire data with a particular sending unit at a particular wheel position on the vehicle.
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5. The method of claim 1 wherein receiving radio signals comprises:
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detecting a primary modulation of a carrier signal transmitted by the transmitting sending unit; and
detecting a secondary modulation of the carrier signal due to the variations in the radio signals.
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6. A receiving unit for use in a remote tire monitor system including a plurality of sending units located at respective wheel locations of a vehicle and configured to transmit radio signals, the radio signals being subject to first modulation by tire data and second modulation imposed by the operating environment of a respective sending unit, the receiving unit comprising:
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demodulation means responsive to the first modulation for recovering the tire data from the radio signals, and decoding means responsive to the second modulation for associating the tire data with respective wheel locations of the vehicle. - View Dependent Claims (7, 8, 9)
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10. A kit for a remote tire pressure monitor system of a vehicle, the kit comprising:
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one or more tire monitors mountable on wheels of the vehicle and configured to transmit radio signals conveying tire data; and
modulation components positionable near respective tire monitors of the one or more tire monitors for imposing secondary variations on the radio signals, the second variations uniquely positioning the respective tire monitors on the vehicle. - View Dependent Claims (11, 12)
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Specification