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Wide dynamic range shaft speed sensor

  • US 4,484,137 A
  • Filed: 04/15/1982
  • Issued: 11/20/1984
  • Est. Priority Date: 04/15/1982
  • Status: Expired due to Fees
First Claim
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1. A shaft speed signal generator for providing a signal responsive to a speed of a shaft, said speed being variable, comprising:

  • means for generating cycles of an alternating current signal having a variable frequency responsive to said speed;

    a clock effective to produce clock pulses at at least first and second substantially different fixed frequencies;

    accumulator means for counting a number of said clock pulses occuring during a predetermined successive number of said cycles for storing a count therein;

    means for changing said fixed clock pulses from said first frequency to said second fixed frequency in response to said speed exceeding a predetermined value;

    means responsive to said count and to said predetermined successive number for calculating said speed; and

    means responsive to each predetermined change in said speed for changing said predetermined successive number whereby said count remains within a predetermined range over an entire speed range of said shaft.

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