System and apparatus to determine the angular position, and spee

Details System and apparatus to determine the angular position, and spee System and apparatus to determine the angular position, and spee

1980-07-10

1982-10-26

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324173, 324392, 731173, 364565, G01P 348, G01P 354

Patent

active

043564470

ABSTRACT:
To positively allocate output signals from a transducer scanning marker elements arranged at a uniform distance from the center of a rotating disk, the markers are located around the circumference of the disk in accordance with a predetermined pattern, for example, uniformly distributed 30.degree. apart, or distributed with uniformly increasing relative distances, and an additional market element (33) and forming a reference marker is located in the zones between adjacent markers spaced from a neighboring marker element (21) of the plurality of marker elements by a distance which is substantially larger than the angular distance with respect to the marker element at the other side of the reference marker. The outputs from a pick-up sensor are evaluated by applying the outputs to two counters, counting a different clock rate, the count output of one of the counters being stored and compared with a subsequent count state of the other counter operating at a higher clock rate. If the second counter has not reached the previously stored count, a positive indication that the sense marker as the reference marker is obtained, permitting a comparator to switch over a transfer switch to route the sensor output to a line indicating that the marker was the reference marker; if the faster-counting counter has, however, reached the count state of a slower counter in the prior cycle, an indication is obtained that the marker is a regularly recurring one, thus permitting control of the transfer of the output from the sensor to a routing line indicating that the marker is a regularly recurring one. The count rates are preferably sufficiently different to accomodate expected variations in speed of rotation of the disk within the recurrence time between adjacent markers.

REFERENCES:
patent: 3763420 (1973-10-01), Maisonville
patent: 3767902 (1973-10-01), Estes et al.
patent: 3883795 (1975-05-01), Klein et al.
patent: 4036190 (1977-07-01), Bigliani et al.
patent: 4039931 (1977-08-01), Schweizer
patent: 4095179 (1978-06-01), Bremer et al.
patent: 4166976 (1979-09-01), Ruhnau et al.
patent: 4262251 (1981-04-01), Fujishiro et al.

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