Abstract
The test engine was a turbocharged 10.5L engine with an intercooler. A performance target was set at a rated power of 300 kW (BMEP = 1.7 MPa) and peak torque of 1842 Nm (BMEP = 2.2 MPa). Emission targets were set at a level of near future and stringent regulation standards in Japan. The engine was equipped with new technologies such as a high pressure common rail system, FCD piston, a high pressure ratio VGT and an aftertreatment system. The high and low pressure loop EGR system was installed and this system with a VGT had a high performance and could increase an EGR rate in order to reduce BSNOx while maintaining the satisfied BSFC and PM performance simultaneously not only in the steady state condition but also in the transient condition.
Highlights
Diesel engines still have considerable advantages in regard to engine power, fuel economy and durability for commercial vehicles when compared with other types of internal combustion engines
The engine-out emission targets without aftertreatment systems are BSNOx = 1.0 g/kWh and Particulate matter (PM) = 0.10 g/kWh under the same test cycle. This target will be achieved by means of combustion improvement and new technologies such as a high pressure common rail system, FCD (Ductile cast iron) piston [10], a high pressure ratio variable geometry turbocharger (VGT) and a combination of high and low pressure loop EGR [7, 8]
In case of the combination of High Pressure Loop EGR (HPL-EGR) and Low Pressure Loop EGR (LPL-EGR) with the back-pressure control valve (BPCV), the EGR rate (HPI = 60, 30, 0%) increased to 40% and the Gt of the combination of HPL-EGR and LPL-EGR gradually decreased to EGR rate 40%
Summary
Diesel engines still have considerable advantages in regard to engine power, fuel economy and durability for commercial vehicles when compared with other types of internal combustion engines. These advantages along with the continuous refinement have led diesel vehicles to the widespread use as prime movers for heavy-duty vehicles. (New ACE) was established in 1992 and has researched the improvement of thermal efficiency and exhaust emissions in heavy duty diesel engines (HDDE) by single cylinder engines [2,3,4,5,6]. In this paper the author has reviewed the research of these 10 years focusing on the improvement of thermal efficiency and exhaust emissions of a heavy duty six cylinder engine [7,8,9]
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