Cost and Fuel Efficient SCR-only Solution for Post-2010 HD Emission Standards

Robert Cloudt; Frank Willems; Peter van der Heijden

doi:10.4271/2009-01-0915

2009-04-20

Cost and Fuel Efficient SCR-only Solution for Post-2010 HD Emission Standards 2009-01-0915

A promising SCR-only solution is presented to meet post-2010 NO_x emission targets for heavy duty applications. The proposed concept is based on an engine from a EURO IV SCR application, which is considered optimal with respect to fuel economy and costs. The addition of advanced SCR after treatment comprising a standard and a close-coupled SCR catalyst offers a feasible emission solution, especially suited for EURO VI.

In this paper, results of a simulation study are presented. This study concentrates on optimizing SCR deNO_x performance. Simulation results of cold start FTP and WHTC test cycles are presented to demonstrate the potential of the close-coupled SCR concept. Comparison with measured engine out emissions of an EGR engine shows that a close-coupled SCR catalyst potentially has NO_x reduction performance as good as EGR. Practical issues regarding the use of an SCR catalyst in close-coupled position will be addressed, as well as engine and exhaust layout.

For comparison, the requirements of a US 2010/EURO VI compliant high EGR engine are discussed: base engine design, heat rejection, fuel injection equipment, turbo charging and fuel economy. From this study, it is concluded that the SCR-only approach leads to a less expensive engine design with better fuel economy and lower PM emissions.

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Cost and Fuel Efficient SCR-only Solution for Post-2010 HD Emission Standards 2009-01-0915

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