Tuesday, November 10, 2015

Headlights, auto turn off

Used to be, headlights were on a switch on the dash. They came on when you pulled a knob out, and went off when you pushed the knob in.
    Simple days, long gone.  Now the car's microprocessor leaves the headlights on to give you some light to get to the door and find the front door key. 
   Except, the microprocessor doesn't get it right.  Either the headlights go off too soon, leaving you fumbling in the dark, or they stay on too long, leaving you standing out in the rain, watching to make sure the microprocessor does finally turn the headlights off, to avoid running down the battery.  Most of us have experienced a car with a flat battery after someone failed to turn ALL the lights off.  And we don't trust microprocessors to get it right.
   Mostly  the microprocessors start timing the head light turnoff time from when the ignition is turned off.  Bad idea.  Better results would be had by starting the turnoff timer when the driver's door opens and closes. The driver may have some packages on the passenger's seat he needs to bring into the house.  Which requires some fumbling around in the dark.   For that matter, the microprocessor should check for other door openings and closings.  The driver may have some groceries in the back seat, and the headlamp timeout should start when the last door is closed. 
   It will take Detroit about 50 years to get this right.

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