Abstract
of Next Generation 2-Stroke Engine
Developed
by Orbital leading international developer of engine technologies direct in
cylinder fuel injection & lean bum system for enhanced fuel economy &
lower emission. This technology exceeds the EP A 2006 emission standards &
offers 40% fuel efficiency over conventional two stroke. Different automotive
companies have licensed & experimented with Orbital clean burning
two-stroke engine & auto major like Peugot, Aprila & other are directly
installing these on their new models. It may not take long before this
technology reaches India as Bajaj auto already has a tie-up with Orbital. This
technology is not only restricted to two wheeler but Ford, BMW and other four
wheeler auto majors have used this technology to manufacture cars powered with
ASDI. Two stroke engine which much better performance than an equivalent four
stroke engine.
Principle
Of (A R C) : -
When
fuel is brought to the right pressure & temperature; molecule breaks down
into what are known as active radical molecules. These are highly unstable
chemical compounds. Formed as an intermediate step in the actual combustion
reaction. When hot exhaust gases remains in the cylinder the small percentage
of active radical molecules combines with the incoming fuel charge & begins
to auto ignite at a lower temperature than a pure petrol/air mixture.
1.
Fresh fuel (white) enters the combustion chamber, pushing the exhaust (gray)
out the open exhaust valve in opposite side of the cylinder.
2.
The incoming fuel mixes with the exhaust & some pockets of fuel are
isolated within the exhaust. The exhaust valve closes & the compression of
the mixture is increased as the piston travels upwards.
3.
The fuel/exhaust mixture is compressed & auto ignites as the piston reaches
the top· of its stroke. This bums all the fuel, and reduces the emission of
unbent hydrocarbons into the environment. At small throttle openings, a
conventional two stroke will start a repeating pattern of misfiring, which
allows a large amount of unbent gas and oil to be expelled directly into the
atmosphere. At these low engine speed, the mixture not ignite by the spark is
the expelled directly into the exhaust system. Each time this misfiring occurs,
the amount of fuel remaining in the cylinder increase, until it is great enough
to be ignited by the spark. But the EXP-2 ignites the entire mixture without
the use of spark at low & medium loads and is able to bum off and oil in
the cylinder in every cycle, eliminating the possibility of misfire and reducing
hydrocarbon emissions. This 400-cc single cylinder not only uses the ASDI and
active radial combustion but a trapping valve too. This is a new technology ion
the design of exhaust valve for two-stroke engine
