Udo Schlemmer-Kelling

Benefits With Common Rail Injection for Medium Speed Engines

The NOx emission of sea going ships is limited by the IMO. The black smoke emission is in the focus of the port authorities and the ship owners. More stringent limits are expected for the near future. Caterpillar Motoren decided to be pro active and to start an emission reduction program in the mid of the nineties. Inside the engine technology like: higher compression ratio, Miller Cycle, injection tuning and internal exhaust gas recirculation were investigated to reduce the NOx Emission. To lower the soot emission a Common Rail system was implemented. The effects of Pre-, Post- and Split injections were optimized for further emission reductions. A special trim of the injection characteristic can improve the transient load acceptance of the engine. A low emission strategy was defined. NOTE: This paper was presented at the ASME 2003 Internal Combustion Engine Division Spring Technical Conference but was printed in the ASME 2003 Internal Combustion Engine and Rail Transportation Divisions Fall Technical Conference proceedings, pages 443–454. It should appear under the CIMAC heading.

Reduction of nitrogen oxide emission from maritime diesel engines in common rail operation

In the framework of the joint EMI-MINI II project, research activities on how to meet the future IMO limits for maritime diesel engines have been performed over a period of 3 years. A reduction of NOx emission by approximately 40 % could be reached by a combination of the Miller cycle with the common rail injection technology, while keeping the efficiency factor constant and an acceptable smoke behaviour.

Reduzierung der Stickoxid emission von Schiffsdieselmotoren im Common-Rail-Betrieb

Im Rahmen des Verbundvorhabens EMI-MINI II wurden uber einen Zeitraum von drei Jahren Forschungsarbeiten zur Erfullung der zukunftigen IMO-Grenzwerte fur Schiffsdieselmotoren durchgefuhrt. Durch Kombination des Miller-Verfahrens mit der Common-Rail-Einspritztechnik konnte eine Reduktion der Stickoxidemission um etwa 40 % bei konstantem Wirkungsgrad und akzeptablem Rauchverhalten erreicht werden.