[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

sunshine penetration photosensor



Well hi! lister
Someone asking if he could modify the photosensor.
I have some information on how it's work this sensor so maybe help a little.
 
The air-conditioning temperature control is affected by sunshine penetration photosensor.
It measures the sunlight falling directly on the car's occupants.
How it work::
The sunlight impinges on a photodiode through a filter and an optical element.The filter has the same effect as sunglasses and prevents sublight from damaging the photodiode.
The photodiode is a light-sensitive semiconductor element. When it is not illuminated, only a small electric current can flow through the diode.
When it is illuminated,the electric current increases.
The stronger the light,the higher the current.
To the control unit, an increase in electric current indicated higher sunshine penetration.
It regulates the interior temperature accordingly.
 
Diagonal sunlight penetration:
 
Particularly sunlight incident on the car's occupants diagonaly from the front,(i.e. directly.increases the feeling of warmth)
The optical element deflects a large proportion of diagonaly penetrating sunlight onto the photodiode.
Cooling is increase to equalised the effect to heat radiation on the body.
 
Vertical sunlight penetration:
 
Vertically incident sunlight is screened by the car's roof.
The optical element deflevts less light onto the photodiode.
Cooling can be reduced as the car's occupants are not directly exposed to haet radiation.
 
Julio,