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A heavy-duty engine concept for ultra-low emissions
Published May 10, 2000 by Societe des Ingenieurs de l'Automobile in France
It is expected that heavy-duty engine legislation in Europe will continue to drive down test cycle BSNOx emissions to levels below 3.5 g/kWh by 2005 and below 2.0 g/kWh by 2008. In the same timeframe, cycle particulate emissions are likely to be cut to below 0.02 g/kWh over the European Steady-state Cycle (ESC). It is unlikely that re-optimization of the engine combustion system alone will be sufficient to meet the future BSNOx and BSPM targets. Other technologies, such as cooled exhaust gas recirculation (EGR) and/or the use of exhaust aftertreatment systems, will be required to achieve these future emissions targets.
Previous work by Ricardo defined a configuration for a premium heavy-duty truck engine for the European market for the model year 2005. Further research, reported here, extended the earlier work to cover developments in aftertreatment technology and the revised proposed emissions levels for 2005 and beyond. Furthermore, an analysis of the cost implications of the various possible emissions control strategies was undertaken and is reported.
A turbocompounded EGR engine fitted with a diesel particulate filter (DPF) was found to achieve the future performance and proposed 2005 emissions targets at minimum cost. Selective catalytic reduction (SCR) was found to offer a potentially commercially competitive alternative to EGR at the lower legislated BSNOx levels expected for beyond 2008.