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Apparatus and method for extrapolating the angular position of a rotating body

  • US 4,081,995 A
  • Filed: 02/22/1977
  • Issued: 04/04/1978
  • Est. Priority Date: 02/22/1977
  • Status: Expired due to Term
First Claim
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1. In a timing control system having a sensor device that provides a reference pulse at least once during each period of rotation of a rotatable member to indicate that the rotatable member is at a known angular position, a clock source for generating a periodic clockpulse signal, a counter responsive to the clock source for producing a pulse-count signal the value of which is a function of the number of clock-pulses generated, a computing device for receiving a plurality of signals that indicate a corresponding plurality of parameters for computing a count corresponding to a desired angular position of the rotatable member and for generating a signal representative of the desired angle count, and a comparator for receiving the pulse-count signal and the desired angle count signal and for producing a function initiating signal when the pulse-count signal and the desired angle count signal are equal;

  • an improved position extrapolation device comprising;

    means in said counter for generating a count signal that is a non-linear function of time and for resetting said counter to a known starting count at each occurrence of said reference pulse,means for sequentially storing the final non-linear count signal to occur immediately prior to each said resetting, andmeans in said computing device responsive to said storing means and to said parameter indicating signals for computing and generating a signal representing the non-linear count corresponding to a subsequent desired angular position for producing a function signal, whereby a function signal is produced at a desired angular position that is based upon a non-linear extrapolation of a known angular position.

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