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Glow plug alternator control

  • US 4,858,576 A
  • Filed: 11/27/1987
  • Issued: 08/22/1989
  • Est. Priority Date: 11/28/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus (20) for controlling the resistance of a glow plug (28) over various operating temperature ranges of an internal combustion engine (24), said apparatus comprising:

  • means (116) for sensing current through said glow plug (28) and delivering a signal relative to the magnitude of said sensed current;

    means (118) for sensing voltage across said glow plug (28) and delivering a signal relative to the magnitude of said sensed voltage;

    means (120,122) for modifying said sensed current and voltage signals to include a preselected resistance;

    means (124) for comparing said modified current signal to said modified voltage signal to produce a resistance error signal in response to a difference between said compared signals;

    means (126) for delivering a voltage signal to said glow plug (28) to control said glow plug'"'"'s resistance relative to said preselected resistance in response to receiving the resistance error signal.

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