Automatic headlamp dimmer having improved signal discrimination and signal processing

  • US 5,329,206 A
  • Filed: 10/30/1992
  • Issued: 07/12/1994
  • Est. Priority Date: 05/06/1991
  • Status: Expired due to Fees
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First Claim
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1. An automatic headlamp dimmer system for a vehicle having high and low beam headlamps including a light sensor for producing an electrical light signal in response to incoming light, an amplifier for amplifying said light signal, and a controller for transmitting a switch signal for causing said headlamps to switch between high beam and low beam modes, said controller comprising:

  • means for detecting when the level of said light signal crosses a threshold;

    means for generating said switch signal a predetermined period of time after said light signal crosses said threshold;

    means for detecting periodicity in said light signal crossing said threshold; and

    means for blocking the generation of said switch signal when said periodicity is present, whereby said headlamps will not switch between high and low beams.

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