Apparatus for controlling a headlight of a vehicle

  • US 4,891,559 A
  • Filed: 12/28/1987
  • Issued: 01/02/1990
  • Est. Priority Date: 06/13/1985
  • Status: Expired due to Term
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First Claim
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1. A computer-controlled apparatus for controlling a headlight of a vehicle comprising:

  • light detecting means for receiving a light impinging on a front end of the vehicle, including a photosensor having a plurality of photoelectric elements at least one of which is a special photoelectric element, said light detecting means for generating a plurality of light detection signals, each said light detection signal corresponding respectively to a quantity of the light received in each of said photoelectric elements, said special photoelectric element being arranged in a central portion of said photosensor and receiving an increased incident range of angles of light on the upper side thereof as compared with others of said photoelectric elements;

    control means, coupled to receive said light detection signals from said light detecting means, for;

    (1) comparing a level of at least one of said light detection signals corresponding to a quantity of light received in a predetermined photoelectric element with a predetermined level;

    (2) discriminating a presence or absence of a preceding vehicle or an oncoming vehicle based on a distribution of a quantity of light received at said plurality of photoelectric elements;

    (3) selecting a high beam mode or low beam mode as an illumination mode of a headlight of said vehicle based on a result of said comparing and discriminating; and

    (4) generating a control signal for commanding said selected high beam mode or low beam mode; and

    illumination switching means for receiving said control signal from said control means and switching the illumination mode of said headlight to obtain said selected high beam mode or low beam mode.

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