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Apparatus and method for comparing output signals indicative of engine rotational speed and/or generator rotational speed

  • US 6,750,635 B2
  • Filed: 09/24/2001
  • Issued: 06/15/2004
  • Est. Priority Date: 09/24/2001
  • Status: Expired due to Term
First Claim
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1. An apparatus for comparing a pair of speed-indicative signals indicative of engine rotational speed or indicative of generator rotational speed, comprising:

  • an input port for electrical connection to a positive voltage output from a rectifier of a generator;

    speed signal circuitry connected to the input port and configured to convert rippling in said positive voltage output into a speed-indicative signal indicative of engine rotational speed or indicative of generator rotational speed;

    an output port connected to said circuitry for applying said speed-indicative signal to a comparator; and

    a means for providing a voltage signal indicative of a voltage across a rectifier bridge of an alternator, said voltage signal being received by said comparator, wherein said comparator is configured to indicated whether a diode of said rectifier bridge is open or inoperative by comparing said speed-indicative signal and said voltage signal.

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