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Tachometer system for measuring the RPM of an internal combustion engine with no physical or visual connection

  • US 5,151,654 A
  • Filed: 07/06/1988
  • Issued: 09/29/1992
  • Est. Priority Date: 07/06/1988
  • Status: Expired due to Fees
First Claim
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1. A tachometer system for an internal combustion engine, comprising:

  • electromagnetic pulse sensing means, coupled in a non-contact manner to an operative area of said internal combustion engine, for sensing an electromagnetic signal produced by a firing of said engine, and producing an output signal indicative thereof;

    means for sensing a parameter indicative of pulse timing in said output signal;

    means for converting said parameter into a value indicative of revolutions of said internal combustion engine per unit time; and

    said sensing means comprising;

    means for receiving said output signal from said electromagnetic pulse sensing means;

    means for detecting a pulse in said output signal;

    means for counting an elapsed time;

    means for selectively enabling and disabling said counting means;

    means for selectively providing an accumulated count of said counting means to an external port; and

    control means, connected to said receiving means, said detecting means, said counting means, said providing means and said selecting means, for initiating a sequence upon detecting a pulse by said detecting means, by, in order;

         1) disabling said counting of said counting means,

         2) commanding said providing means to provide said accumulated count,

         3) resetting said counting means, and finally

         4) enabling said counting means.

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