Fogging on the inside of the windshield
is a common phenomenon that occurs when the inside of the windshield reaches
the dew point caused by drastic changes in temperature and humidity between
the outside and inside of the vehicle. This impairs the driver's vision
and therefore all passengers safety. To ensure safety, action must be taken
before the windshield becomes fogged. Our sensor measures
the dew point via the relative humidity and temperature
on the inside of the windshield, allowing the
HVAC system
to actively prevent fogging. To simulate the drastic temperature and humidity
change between indoors and outdoors I'm using a coolant spray. I want to show you what happens
if the temperature and humidity between indoors
and outdoors change. For this i’m spraying coolant onto the outside of the demonstrator,
which replicates the vehicle windshield. On the plot, you can see that
the temperature is rapidly decreasing. The windshield begins to fog up as soon as the temperature falls be
low
the dew point temperature. As a response, the HVAC automatically
blows air onto the windshield to raise the temperature
and lower the humidity to prevent fogging. This is clearly indicated
with the purple ribbon. You can now see that the temperature
gets back to normal and the HVAC stops blowing air onto the windshield.
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