Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-07
1995-05-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356218, G01J 350
Patent
active
054163188
ABSTRACT:
A combined ambient light magnitude and light source direction sensor controls the headlamps and cabin climate of a vehicle. The combined unit employs a photodiode having a predetermined spectral response and a diffuser which also has a predetermined spectral response, the spectral responses being combined to achieve an overall spectral response which corresponds to that of the human eye. With this arrangement, the headlamps of a motor vehicle are turned on and off under different ambient light conditions, in a manner which corresponds to the perception of the driver. In addition, a light modulator provides the combined unit with a sensitivity to the angular location of the sun with respect to the vehicle in which the unit is installed. Such angular sensitivity facilitates in determining the portion of the interior of the vehicle undergoing thermal loading by the sun, and facilitates a corresponding adjustment of the climate control system.
REFERENCES:
patent: 4933550 (1990-06-01), Hegyi
patent: 5029220 (1991-07-01), Juday
patent: 5235178 (1993-08-01), Hegyi
Le Que T.
Nelms David C.
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