INTRODUCTION
A wiper generally consists of
an arm, pivoting at one end and with a long rubber blade attached to the other.
The blade is swung back and forth over the glass, pushing water from its surface.
The speed is normally adjustable, with several continuous speeds and often one
or more "intermittent" settings. Most automobiles use two
synchronized radial type arms, while many commercial vehicles use one or more
pantograph arms. Mercedes-Benz pioneered a system called the Monoblade in which
a single wiper extends outward to get closer to the top corners, and pulls in
at the ends and middle of the stroke, sweeping out a somewhat 'W'-shaped path.
Some larger cars are equipped with "hidden" (or "depressed-park")
wipers. When wipers are switched off, a "parking" mechanism or
circuit moves the wipers to the lower extreme of the wiped area, near the
bottom of the windscreen, but still in sight. To hide the wipers, the
windscreen extends below the rear edge of the hood, and the wipers park
themselves below the wiping range at the bottom of the windscreen, but out of
sight.
falls the driver has to sense
it and switch on the button that actuates the wiper. Wipers may be powered by a
variety of means, although most in existence today are powered by an electric
motor through a series of mechanical components, typically two 4-bar linkages
in series or parallel. Vehicles with air operated brakes sometimes use air
operated wipers, run by bleeding a small amount of air pressure from the brake
system to a small air operated motor mounted just above the windscreen. These
wipers are activated by opening a valve which allows pressurized air to enter
the motor.
So in conventional wiper system, when the
rain in our project we have installed a sensor to detect the rainfall and
actuate the wiper automatically.
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