Simulation Guided Development of High Boosted Diesel Engines with Exhaust Gas Recirculation

Authors

Harald Fessler, Gilles Hardy, Thomas Eckhardt, Wolfgang Gstrein, IVECO Motorenforschung AG, Arbon

Year

2005

Summary

The use of highly boosted heavy duty diesel engines with EGR (Exhaust Gas Recirculation) is one way in which future exhaust emission legislations and test procedures, which include cold phases, can be satisfied. High EGR rates, either at full load or part load, are employed to enable the use of alternative combustion modes. High boost levels are necessary so that at least the current power densities can be maintained. EGR can be combined with SCRT (Selective Catalytic Reduction Technology) or even partially substitute it where necessary. A further challenge is to be able to reduce the size of the exhaust after-treatment components whilst maintaining the necessary optimum operating temperature levels. Enhanced one-dimensional cycle-simulation calculations were employed to ascertain the limits of the turbo-charging and the EGR systems, interacting with the after-treatment components. Specifically developed CFD models are used in IVECO for the investigation and layout of new combustion concepts. The new ECFM-3Z combustion model from IFP is well able to capture the pre-mixed and diffusion phases of compression ignition combustion. The CFD calculations are successfully employed both as diagnostic and development tools and the use of these methods allows us to explore the possibilities to satisfy future limits.

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