New Approaches to Variable Displacement – What Will Be Next after Cylinder Deactivation on Gasoline Engines?

Authors

Dr.-Ing. J. Roß, Dr.-Ing. P. Grigoriadis,
Dipl.-Ing. O. Dingel, Dipl.-Ing. A. Werler,
Dipl.-Ing. H. Neukirchner, IAV GmbH, Chemnitz

Year

2012

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 735

Summary

Fuel economy results close to those of diesel engines could be obtained for the gasoline (Otto) engine in the New European Driving Cycle (NEDC) by means of cylinder deactivation (CDA). This can be achieved without renouncing the classical benefits of the gasoline engine such as low noise and emission levels or its typical liveliness. In cycles providing higher load fractions, the positive fuel economy effect of CDA can turn out to be much smaller. Additionally, shutting off cylinders by deactivating the intake and exhaust valves does not lead to significantly reduced friction torque in the engine. This article therefore discusses additional measures aimed at further decreasing fuel consumption such as the partial deactivation of the cranktrain, an asymmetric displacement split and a combination with variable valve lift.

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