A recent typical ABS is composed of a
central electronic unit, four speed sensors (one for each wheel), and two or
more hydraulic valves on the brake circuit. The electronic unit constantly
monitors the rotation speed of each wheel. When it senses that one or more
wheel is rotating slower than the others (a condition that will bring it to
lock), moves the valves to decrease the pressure on the braking circuit,
effectively reducing the braking force on that wheel.
On high-traction surfaces
such as bitumen, whether wet or dry, most ABS-equipped cars are
able to attain braking distances better (i.e. shorter) than those that would be
possible without the benefit of ABS. A moderately-skilled driver without ABS
might be able, through the use of cadence-braking, to match the performance of a
novice driver with an ABS-equipped vehicle. However, for a significant number
of drivers, ABS will improve their braking distances in a wide variety of
conditions.
The brake pedal or Bush
Button was activated at the time of any braking time. The Electrical Signal is
given to the solenoid valve, when the pedal/Bush Button is activated. The
compressed air is goes to the solenoid valve.
The solenoid valve is simultaneously activated at the
time of pedal/Button pushed. The compressed air goes to the pneumatic cylinder.
The compressed air pusses the pneumatic cylinder piston and move forward. The
braking operation occurred at the of solenoid valve activated time. This
activation of solenoid valve is continuous process and a constant and smooth so
that the smooth braking operation is done.
Another solenoid valve is deactivated at the time of
pedal releasing time. The inside of the pneumatic cylinder air goes to the
solenoid valve with the help of exhaust port.
ADVANTAGES:
Ø It requires simple maintenance cares
Ø The safety system for automobile.
Ø Checking and cleaning are easy,
because of the main parts are screwed.
Ø Easy to Handle.
Ø Manual power required is less
Ø Repairing is easy.
Ø Replacement of parts is easy.
Ø No Oil wastage.
v Initial cost is high.
v High maintenance cost
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