Variable Valve Trains for Passenger Car Diesel Engines – Potentials, Limits and Ways of Realisation

Authors

Dipl.-Ing. K. Blumenröder, Dipl.-Ing. G. Buschmann, Dipl.-Ing. J. Kahrstedt, Dipl.-Ing. A. Sommer, Dr.-Ing. O. Maiwald, IAV GmbH, Berlin

Year

2006

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 622

Summary

The challenge facing passenger-car diesel engine developers lies in meeting drastically reduced emission ceilings while maintaining or even enhancing the specific benefits of the diesel engine. At the same time, the cost aspect plays an increasingly important role. In the course of its ADCS (Advanced Diesel Combustion System) development project, IAV GmbH looks at the contribution a variable valve train can make in this context. This paper first assesses the potential offered by all known variable valve actuation concepts for reducing the exhaust gas raw emissions both in steady-state and transient engine operation. The most promising approaches are then used to run suitable tests on a single-cylinder engine with a fully variable valve train. The results demonstrate that improvements can be achieved both in steady-state and transient operation. In the case of the homogenized combustion process, this opens up possibilities for rapid combustion phasing through gas composition and gas temperature control. The next step focuses on implementing a variable valve train on a multi-cylinder engine. Design integration in the cylinder head and the closed-loop control strategy for transient engine operation are shown.

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