Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1979-04-30
1980-12-09
Myracle, Jerry W.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340 58, B60C 2302
Patent
active
042377285
ABSTRACT:
An abnormal tire profile indicating system comprising a telemetry unit mounted on each wheel of a vehicle and a central receiver. Each telemetry unit comprises a piezoelectric transducer which is deflected with each wheel revolution when the tire profile is low. Deflecting the transducer produces an electric pulse. The transducer pulses are accumulated on a charge storage capacitor to provide a power supply. When the level of charge on the capacitor reaches a predetermined level, a counter commences counting the transducer pulses. When a predetermined number of pulses are counted, the counter renders a transistor conductive, which transistor connects the power supply capacitor to an encoder and a transmitter. The encoder produces encoded signals and resets the counter after a predetermined number of encoder signals are produced. The central receiver receives the modulated radio signals from each of the telemetry units. The counter limits the transmitter to transmitting only after a sufficient number of low profiles are detected to assure reliable operation and only after a sufficient number of wheel revolutions to meet FCC periodicity of transmission requirements. The reset counter limits the duration of transmissions to meet FCC requirements.
REFERENCES:
patent: 3760351 (1973-09-01), Thomas
patent: 4117452 (1978-09-01), Snyder et al.
Betts David A.
Ledenbach Gregory W.
Baumann Russell E.
Gould Inc.
Minnich Richard J.
Myracle Jerry W.
National Semiconductor Corporation
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