Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1993-01-11
1994-09-06
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324165, 340672, 364565, G01P 3481, G01P 3489
Patent
active
053451716
ABSTRACT:
In one aspect of the present invention, an apparatus determines the rotational speed and direction of a rotating object. The apparatus includes a sensor adapted to detect the speed and direction of the rotating object and responsively produce a frequency signal indicative of the speed of the rotating object and a direction signal having a voltage value indicative of the rotational direction of the rotating object. A distinguishing stage receives the frequency and direction signals, and determines the voltage value of the portion of the direction signal that coincides with the falling edge of the frequency signal. Responsively the distinguishing stage produces a control signal having a voltage level responsive to the determined voltage value of the direction signal. A converting stage receives the frequency signal and responsively produces an output signal having a DC voltage proportional to the frequency of the frequency signal. A directional stage receives the control signal and the output signal, and changes the polarity of the output signal in response to the voltage level of said control signal. An output device receives the polarized output signal, and stores the magnitude and polarity of the output signal.
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Heilborn, John; Tech Talk All About Pointing Devices Computer Shopper, Dec. 1992, pp. 856-858.
Article: Electronic Design, Sep. 17, 1992, "Build an Error-Free Encoder Interface", James A. Kuzdrall.
Love W. John
Simmons Jeffrey J.
Caterpillar Inc.
Masterson David M.
Strecker Gerard R.
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