TIRE PRESSURE MONITORING SYSTEM
First Claim
1. A tire pressure monitoring system including a tuned circuit rotating with the tire to be monitored, the tuned circuit including a pressure-responsive switch, said system further including a variable frequency transmitter supplying energy to the tuned circuit, a controller producing a ramp voltage at a predetermined frequency which is low relative to the frequency range of said transmitter, means coupling said controller to said transmitter, the frequency of said transmitter being determined by said ramp voltage, whereby said transmitter transmits signals over a band of frequencies, and a receiver for detecting energy in the tuned circuit, said band of frequencies including the resonant frequency of the tuned circuit.
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Abstract
A tire pressure monitoring system has a tuned circuit rotating with the tire to be monitored. The tuned circuit incorporates a pressure-responsive switch, and energy is applied to the tuned circuit by a transmitter. A receiver detects energy in the tuned circuit, and the transmitter transmits signals over a band of frequencies including the resonant frequency of the tuned circuit.
12 Citations
2 Claims
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1. A tire pressure monitoring system including a tuned circuit rotating with the tire to be monitored, the tuned circuit including a pressure-responsive switch, said system further including a variable frequency transmitter supplying energy to the tuned circuit, a controller producing a ramp voltage at a predetermined frequency which is low relative to the frequency range of said transmitter, means coupling said controller to said transmitter, the frequency of said transmitter being determined by said ramp voltage, whereby said transmitter transmits signals over a band of frequencies, and a receiver for detecting energy in the tuned circuit, said band of frequencies including the resonant frequency of the tuned circuit.
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2. A system as claimed in claim 1 in which the output frequency of the receiver is compared with the output frequency of the ramp voltage, and a warning is given only if the compared frequencies are unequal.
Specification
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Current AssigneePaul Anthony Harris
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Original AssigneePaul Anthony Harris
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InventorsHarris, Paul Anthony
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Primary Examiner(s)Waring, Alvin H.
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Application NumberUS05/382,848Time in Patent Office523 DaysField of Search340/58 200/61.22,61.25US Class Current340/448CPC Class CodesB60C 23/0428 using passive wheel mounted...
