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Demonstration of a Euro 3 Heavy-Duty Diesel Engine Using Exhaust Gas Recirculation
Published April 24, 1997 by Verlag Des Verein Deutscher Ingenieure GmbH in Germany
A project has been undertaken to demonstrate the potential of exhaust gas recirculation (EGR) to achieve the expected Euro 3 emission limits for heavy-duty engines, while maintaining the good fuel economy of the baseline Euro 2 engine.
The paper covers the development of EGR system on a 4-valve, multicylinder, heavy-duty engine. It was found that, by means of EGR in combination with a variable geometry turbocharger (VGT), ECE R49 test cycle vales of <5g/kWh NOx and <1g/kWh particulates were achieved, with acceptable fuel consumption. Results over the proposed OICA test cycle are also given in the paper.
The paper includes results from a 1000-hour endurance test with EGR and observations from initial driveability tests on a heavy truck fitted with the EGR system.
The project has identified areas where further development is necessary in order to take the EGR system into full scale production, notably the EGR system and the VGT.