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Mitsubishi Heavy Industries,
Ltd. (MHI) has obtained a certification for its engines from the Vehicle
Certification Agency (VCA) of the U.K., first in the world, for clearing
the required criteria for the second phase of exhaust gas emission control
regulations set by the European Union (EU). The two types of its industrial
use diesel engines utilize the swirl chamber method with their power ranging
from 37 kW (kilowatts) to 75 kW.
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 The regulation of the EU's Phase
II emission control, to be enforced from the year 2002, aims at reducing
overall emissions of nitrogen oxide (NOx) and particle material (PM) by
40%, requiring the NOx emission to be below 7 grams per kilowatt hour
(kWh)
and PM to be below 0.4 gram/kWh.
MHI has satisfied this stringent criteria by improving cylinder design
and enabling smoother fuel gas flow from the swirl chamber to main combustion
chamber, among other innovations.
MHI supplies both gasoline and diesel engines for industrial use. Its
Sagamihara Machinery Works produces 83,500 diesel engines annually, of
which 80,000 units are small-sized diesels ranging from 5 hp (horsepower)
to 130 hp with 30,000 units being exported. These engines are mainly used
for general construction machinery, forklift trucks, agricultural and
forestry machinery. The engines certified by the VCA (two of its four
engine types in the 37 kW to 75 kW category) are used mainly for agricultural
use tractors, forklift trucks and power supply for construction machinery,
among additionals.
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The swirl
chamber engines have two chambers; a swirl flow chamber and main combustion
chamber. The swirl chamber engines have an advantage of lower noise levels
compared to direct injection engines. MHI has strived to reduce NOx and
PM, as well as further lowering of current noise levels. Specifically, MHI
has reduced NOx by controlling sudden temperature rise of fuel gas in the
combustion chamber. To reduce PM emission to a half, which is emitted as
unburned fuel material, MHI takes careful design measures to ensure that
the fuel gas flow from the swirl chamber to the main combustion chamber
is smoother for complete combustion.
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MHI will further strengthen
its industrial use engine marketing structure while at the same time apply
to the VCA for certification for its remaining two engine types in the
37 kW to 75 kW category.
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Engine and
Transmission Sales Group
Business Department
Sagamihara Machinery Works |
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TEL: 81-42-761-2823
FAX: 81-42-763-0814
E-mail:jjr200@mail.smw.mhi.co.jp
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