Method and apparatus for digital calculation of rotational speed

Details Method and apparatus for digital calculation of rotational speed Method and apparatus for digital calculation of rotational speed

1974-06-26

1976-06-15

Corbin, John K.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324170, G01P 348, G01P 354

Patent

active

039639878

ABSTRACT:
A method and apparatus for determining the rotational speed of an engine, using electrical pulses produced with revolving parts of the engine, including the use of a number of series of transducers or pickups producing numbers of asynchronous pulses, different for each series during each revolution of the engine, the transducers corresponding to as many series of detection elements comprising teeth and/or bosses spaced on the periphery of corresponding revolving parts of the engine, such that if n is the number of detection elements of a largest series giving the highest pulse frequency for a corresponding transducer due to engine revolution, and q is the total number of transducers associated with another series of detection elements, then the angular location of said another series of detection elements is obtained to the nearest 360.degree./qn. The pulses obtained are shaped, compared with a fixed reference frequency to count the shaped pulses and then divided and converted into analog signals or properly coded signals.

REFERENCES:
patent: 2556471 (1951-06-01), Elam
Hammond, P. W. "Zero-Speed Pulse Tachometer", IEEE Trans Industrial Electronics Control Instrum., vol. IECI-17, No. 4, 1970, pp. 292-296.
Walewski, L. G., Kendrick, V. C. "Position Detection Device using Amplitude Modulation", IBM Tech. Disclosure Bulletin, vol. 14, No. 7, Dec. 1971, pp. 2119-2120.

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