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Automatic Car Headlamp range Control Circuit

2015-03-02 00:15  
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A headlamp is a lamp attached to the front of a vehicle to light the road ahead. Headlamp performance has steadily improved throughout the automobile age, spurred by the great disparity between daytime and nighttime traffic fatalities.The U.S. National Highway Traffic Safety Administration states that nearly half of all traffic-related fatalities occur in the dark, despite only 25% of traffic travelling during darkness.It is annoying to realize that you have left your car headlights on only to find that the battery is flat. One possible way to prevent this is with the present control. The circuit does not provide a warning, but an action: when you switch off the ignition, relay Rel is de-energized and the headlights are switched offa€”unless you deliberately decide otherwise. That decision is made possible by switchSI , which, when operated, triggers silicon-controlled rectifier Thl so that Rel is energized. Notice that this is possible only when the ignition switch, S2, is off. Otherwise, the voltage across Thl is so low, owing to shunt diode Dl, that it cannot be triggered. However, the headlights should not normally be switched on when the ignition is off; in most cases SI will be used only rarely and the switch can then be omitted altogether. The relay should be a standard 12-V car type with contacts that can switch up to 25 A. Automatic headlight range control ensures the best headlight setting for illumination of the road ahead. It automatically adjusts the angle of the beam to compensate for your car’s load, stopping your lights dazzling oncoming traffic. The control function automatically adjusts the headlights’ angle of inclination depending on the current vehicle load.

 

Car Headlight Control