Electrical system for vehicle daytime running lights

  • US RE37,677 E1
  • Filed: 02/05/1998
  • Issued: 04/30/2002
  • Est. Priority Date: 02/05/1987
  • Status: Expired due to Term
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First Claim
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1. A headlight circuit for a vehicle, said vehicle having an engine and a plurality of headlights including headlight filaments, and wherein the vehicle operator may select a normal mode of operation of said headlights whereby a parallel circuit connection is established between at least two headlight filaments, comprising in combination:

  • electrical circuit means for establishing said parallel circuit connection between said headlight filaments;

    electrical circuit means for establishing a series circuit connection between said headlight filaments;

    means for detecting when the engine is running;

    means for detecting when the operator has selected said normal mode of operation of the headlights , and for providing a normal-mode signal in response thereto;

    means for establishing a reference voltage; and

    electrical circuit means for converting said parallel circuit connection to said series circuit connection when the engine is running and the operator has not selected the normal mode of operation of the headlights, and said normal-mode signal is below said reference voltage, whereby said conversion of said parallel circuit connection reduces the current flowing through the headlight filaments and reduces the intensity of the light output from said filaments.

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