Homogeneous Diesel Combustion Process for EURO 5 and TIER2/LEV2 – Implementation of the Modified Working Cycle using Innovative Hardware and Control Concepts

Authors

Dipl.-Ing. J. Kahrstedt, Dipl.-Ing. G. Buschmann, Dipl.-Ing. O. Predelli, Dr.-Ing. K. Kirsten, IAV GmbH, Berlin

Year

2004

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 566

Summary

From where we stand today, post-2007 exhaust-emission legislation for passenger-car diesel engines will demand the full exploitation of cost- and CO2-optimising measures wherever possible to reduce the limited emissions. As one concept, this paper demonstrates the potential benefits to be harnessed from a homogeneous diesel combustion process for the engine map's lower part-load range. Permitting combustion virtually free of NOx and particulate emission, the ideally labelled Homogeneous Charge Compression Ignition (HCCI) process significantly reduces the demands on costintensive, active exhaust gas aftertreatment systems. Analysing the legal framework and the state of developments in homogeneous diesel combustion based on today's engine concepts, the paper shows the demands placed on realising the changes in process control by examining the chemical kinetics in conjunction with engine process simulation and provides verification in the form of measurements on a single-cylinder engine. Future development activity aiming at an extension of the load range has to focus on the fine adjustment of combustion chamber processes (intake temperature, compression, exhaust-gas recirculation, boost pressure, charge mass, injection and mixture formation) which, in part, will demand an approach to engine control systems based on physical models. The paper demonstrates that the development of the homogeneous diesel combustion essentially coincides with the evolutionary progress being presently made in modern diesel engines.

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