Communications: electrical – Selective – Having indication or alarm
Patent
1977-12-08
1980-01-29
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
731465, 116 34R, 200 6125, 235 92T, B60C 2302, G08B 2100
Patent
active
041863771
ABSTRACT:
A method and apparatus are provided for monitoring tire pressure for motor vehicles, or the like, in which coded sound signals emitted from a wheel-mounted sound signal generator are detected and processed. The coded signal from the generator serves to distinguish the sound signal from background noise. The output of the generator is comprised of at least two coherent frequencies that beat acoustically with one another to produce an amplitude modulated sound signal that is then detected by a transducer which converts the sound signals into the electrical signals. The electrical signals are then fed through the processing circuitry including a detector which extracts the modulation envelope and applies it to an audio band-pass filter. The filter accepts the envelope within a predetermined frequency range, eliminating all signals which are not within the designed band pass. A second detector converts the audio signal to a DC level and feeds it to a threshold comparator. The level of the DC signal is directly proportional to the percentage of modulation of the originally received signal. If this level exceeds the threshold value of the comparator, the output actuates a bistable device, which, in turn, actuates a warning indicator.
The rate of loss of tire pressure may also be determined by means of a signal generator adapted to emit at least two time-spaced sound signals at different pressures. The two signals are detected and processing circuitry calculates the time and/or pressure remaining before the vehicle becomes immobile. This information is displayed to the operator.
REFERENCES:
patent: 3296590 (1967-01-01), Dalton
patent: 3513463 (1970-05-01), Stevenson et al.
patent: 3691549 (1972-09-01), Wilson
patent: 3713092 (1973-01-01), Ivenbaum
patent: 3721972 (1973-03-01), Hermans
patent: 3835447 (1974-09-01), Lowrance
patent: 3890595 (1975-06-01), Barabino
patent: 3934223 (1976-01-01), Barabino
Caldwell Sr. John W.
Nowicki Joseph E.
Safety Research & Engineering Corporation
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