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With the economic development of countries around the world led by BRICs(Brazil, Russia, India, China), the total number of automobiles in the world continues to rise. From the standpoint of preserving limited petroleum resources and reducing CO2 emissions, improved fuel consumption is necessary if we are to continue enjoying the use of automobiles. In Europe, significant development of diesel engine technology as a power source for automobiles has taken place to reduce fuel consumption and to enhance the “Fun to Drive” experience, and market share of diesel engines has increased in this area. However, with increasing environmental awareness worldwide, all areas of the globe are seeing tightened regulations for not only fuel consumption, but also exhaust emissions, including those for PM(Particulate Matter) and NOx. Of these regulations, the requirement for vehicles to satisfy the US Tier 2 Bin 5 rating, regardless of whether they are gasoline or dieselpowered, is the most stringent.