The experience in improving automotive diesel engines concerning stricter emission laws revealed that a flexible fuel injection system especially with product features like injection rate shaping, free adjustment of injection pressure, flexible start of injection, pre and post injection, can safely fulfil customer requirements. An environment friendly combustion is also of high significance for medium speed engines for marine and stationary application. Therefore, heavy fuel (HFO) engines will need common rail (CR) injection systems with a high degree of flexibility that will dominate the market in the future. MAN B&W has developed the future oriented HFO CR technology in-house. Based on a bench-marking of different CR system concepts by means of hydraulic simulations, combustion simulations, cost value analysis und concept test, the MAN B&W CR concept was incorporated in a long term technology planning. Besides the emission requirements, important safety aspects for marine application were integrated from the beginning of the development. After the first basic investigations, a modular system of components for a HFO CR fuel injection system was developed, depending on the engine type and size. The novel concept for HFO application finally comprised a single circuit system without additional servo-control circuit and with modular rail segments. By matching the control valve, the injection rate can be adjusted and the injection divided into separate events with pre and post injection. The modular layout and hydraulic concept ensure an easy retrofit also for engines in the field. The start of the first customer application was preceded by an extensive test programme at the development centre validating the development.
New concept of HFO common rail injection system for MAN B&W MS diesel engines
Neues Konzept eines Common-Rail-Einspritzsystems für den Betrieb von MAN B&W MS Dieselmotoren mit schwerem Heizöl
2004
12 Seiten, 19 Bilder, 4 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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