Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1974-07-30
1976-04-20
Aegerter, Richard E.
Measuring and testing
Volume or rate of flow
Expansible chamber
73194E, 307271, G01F 105
Patent
active
039509893
ABSTRACT:
A circuit for converting an input DC value to a pulse signal of a given frequency, and including an integration circuit which receives as its input a composite DC signal which includes the DC value, and provides an integrated output therefrom. A hysteresis amplifier receives the integrated output, and in response thereto provides a binary output signal. A switching device having two states receives the binary output signal, and in response thereto, respectively switches between its two states. A pulse generating circuit is coupled to the switching device and produces a sequence of fixed pulses at a predetermined, noncritical rate. The switching device only permits the fixed pulses to be transmitted during one of its states. An output circuit which includes a counting device is coupled to the switching means and receives the fixed pulses which are transmitted by the switching device and counts them. A frequency to DC conversion circuit is coupled in a feed back arrangement between the switching device and the integration circuit for converting into a DC level the average pulse rate which the switching devices transmits. The DC level in conjunction with the input DC value forms the composite DC signal. The total number of pulses counted per unit time will depend upon the composite DC signal. In a specific embodiment, the DC to frequency conversion circuit is incorporated in a fuel flow system for providing a pulse count output representing the amount of fuel consumed.
The aforementioned Abstract is neither intended to define the invention of the application which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
REFERENCES:
patent: 3504267 (1970-03-01), James et al.
patent: 3635084 (1972-01-01), Lamphere et al.
patent: 3835419 (1974-09-01), Milne et al.
Aegerter Richard E.
Thaler Michael H.
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