Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1982-04-15
1984-11-20
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324161, G01P 348, G01P 354
Patent
active
044841370
ABSTRACT:
A digital shaft speed sensor modifies a clock frequency and counting period to provide a speed signal having wide dynamic range with adequate resolution. The division ratio of a programmable divider counting pulses from a shaft encoder is modified by a central processing unit based on the count or speed measured in a preceding counting. The output of the programmable divider sets an interval during which clock pulses are counted to determine the shaft speed. Since the dividing ratio of the programmable divider is dynamically changed according to previous speed measurements, the total number of clock pulses is correspondingly changed. In addition, the output frequency of the clock pulses is changed so that, at low speed, a low clock frequency can be used and at higher speeds, one or more higher clock frequencies can be used to maintain resolution with reasonable memory size.
REFERENCES:
patent: 3470365 (1969-09-01), Nather
patent: 3863153 (1975-01-01), Eshraghian
patent: 4041289 (1977-08-01), Brosh
patent: 4080657 (1978-03-01), Caldicott
Cole: "Measure Pulse-Rate Ratios Automatically . . . ", Electronic Design--Nov. 22, 1976--pp. 140-142.
Mereness: "Bicycle Tachometer/Speedometer", IBM Tech. Discl. Bull.--vol. 17, No. 9--pp. 2570-2571.
General Electric Company
Krawczewicz Stanley T.
Mitchell James W.
Solis Jose M.
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