Denso CRS - Common Rail System Operation Overview; Diesel Engine Environmental Impact and Regulations

Operation Section
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1. GENERAL DESCRIPTION
1.1 Changes In Environment Surrounding The Diesel Engine
z Throughout the world, there is a desperate need to improve vehicle fuel economy for the purposes of preventing global
warming and reducing exhaust gas emissions that affect human health. Diesel engine vehicles are highly acclaimed in
Europe, due to the good fuel economy that diesel fuel offers. On the other hand, the "nitrogen oxides (NOx)" and "par-
ticulate matter (PM)" contained in the exhaust gas must be greatly reduced to meet exhaust gas regulations, and tech-
nology is being actively developed for the sake of improved fuel economy and reduced exhaust gases.
(1) Demands on Diesel Vehicles
• Reduce exhaust gases (NOx, PM, carbon monoxide (CO), hydrocarbon (HC) and smoke).
• Improve fuel economy.
• Reduce noise.
• Improve power output and driving performance.
(2) Transition of Exhaust Gas Regulations (Example of Large Vehicle Diesel Regulations)
• The EURO IV regulations take effect in Europe from 2005, and the 2004 MY regulations take effect in North America
from 2004. Furthermore, the EURO V regulations will take effect in Europe from 2008, and the 2007 MY regulations
will take effect in North America from 2007. Through these measures, PM and NOx emissions are being reduced in
stages.
Q000989E
PM
g/kWh
NOx
g/kWh
2005 20082004 2007
3.5
2.0
2.7
0.27
1998 MY 2004 MY 2007 MY
EURO EURO EURO
EURO EURO EURO
1998 MY 2004 MY 2007 MY
0.013
0.13
0.11
0.03
Europe Europe
North America
North
America
2005 20082004 2007