Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1980-05-16
1982-06-08
Woodiel, Donald O.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
731468, 137224, 137227, B60C 2304
Patent
active
043334911
ABSTRACT:
A system for obtaining precise inflation to a desired pressure setting of pneumatic tires comprises a pressure transducer which provides an output voltage proportional to its input pressure determines the output frequency of a voltage/frequency converter. The output of the voltage/frequency converter is gated into a counter for a set period determined by a timer unit so that in such period the counter assembles a count which is a measure of the sensed pressure. The timer unit is adapted to divide down the local a.c. mains supply frequency so as to derive therefrom discrete timing pulses enabling cyclic operation of the apparatus within a predetermined timing framework. A user has the facility to enter a pressure target into the apparatus and, during each cyclic operation, a comparison is effected between the pressure sensed by the transducer and the set target pressure and, depending upon the outcome of this comparison, a pressure increment or decrement is affectuated as appropriate by operation of an inflate or exhaust valve. Compensation for transducer and/or voltage/frequency converter drift is described, together with variants such as for enabling extra large tires to be rapidly inflated.
REFERENCES:
patent: 3421106 (1969-01-01), Garber et al.
patent: 3762223 (1973-10-01), Feuer et al.
patent: 3908460 (1975-09-01), Lichowsky
patent: 4089058 (1978-05-01), Murdock
patent: 4115767 (1978-09-01), Brosh
patent: 4192005 (1980-03-01), Kurtz
patent: 4226125 (1980-10-01), Waugh
patent: 4250759 (1981-02-01), Vago et al.
patent: 4253480 (1981-03-01), Kessel et al.
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