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Glow plug duty cycle modulating apparatus

  • US 4,312,307 A
  • Filed: 02/04/1980
  • Issued: 01/26/1982
  • Est. Priority Date: 02/04/1980
  • Status: Expired due to Term
First Claim
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1. Apparatus for providing a thermal analog of diesel engine glow plugs and to modulate the duty cycle of power supplied to such glow plugs comprisinga housing, first and second ceramic like heater elements disposed in the housing, a heat sensitive, normally closed switch mounted on top of each of the first and second heater elements in thermally coupled relation with each respective heater element, heat sink means thermally coupled to both the first and second heater elements, means to connect the switches in series circuit relation and connectable to means controlling the energization of the glow plugs and to an ignition switch, one of the two switches modulating the current flow to the glow plugs, the other of the two switches as a back up protector, means to electrically energize the first and second heater elements only when current is passing through both heat sensitive switches, and means to interrupt current flow to the glow plugs upon the occurrence of a preselected condition.

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