Automatic headlamp dimming system

  • US 4,862,037 A
  • Filed: 12/24/1987
  • Issued: 08/29/1989
  • Est. Priority Date: 12/24/1987
  • Status: Expired due to Fees
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First Claim
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1. A method of controlling the down-switching of a multibeam pattern headlamp system in a vehicle when opposing vehicles approach within the corresponding beam pattern, comprising the steps of:

  • providing headlamps on said vehicle for projecting a plurality of predetermined high intensity patterns directed outwardly from the vehicle in overlapping areas;

    providing a source of electrical energy for energizing the headlamps;

    providing a switching means that is controllable to connect said source of electrical energy to selected headlamps;

    providing a first sensor for sensing the presence of headlamp radiation from oncoming vehicle headlamps over a wide range including said overlapping areas of said beam patterns and indicating said presence when said oncoming radiation is sensed as being above a predetermined threshold;

    providing a second sensor for sensing the presence of headlamp radiation from oncoming vehicle headlamps within a limited area of said overlapping beam patterns corresponding to one of the beam patterns and indicating said presence when the intensity of said oncoming radiation is sensed as being above a predetermined threshold; and

    controlling said switching means in response to the indications from said first and second sensors in order to down-switch said headlamp beam patterns by disconnecting said source of electrical energy from appropriate headlamps and restoring said connections when said first and second sensors cease to provide said indications.

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