Cylinder Deactivation with Mechanically Fully Variable Valve Train

Event
SAE 2012 World Congress & Exhibition
Authors Abstract
Content
The targets for future gasoline engines in terms of fuel consumption and exhaust gas emissions require the introduction of advanced technologies to increase engine efficiency.
The mechanically fully-variable valve train system UniValve is an effective device to reduce fuel consumption through throttle-free load control. This is achieved by the simultaneous variation of valve lift and valve opening event. The method of cylinder deactivation by closing the gas exchange valves is a further approach to increase the efficiency of combustion engines especially at part load.
This paper presents the combination of both techniques on a downsized, turbo charged 4-cylinder DI gasoline engine. The mechanical integration of the valve shut-off capability for cylinder deactivation into the Univalve system is explained and strategies for the transition between 2-cylinder and 4-cylinder modus are discussed. The thermodynamic benefits through adoption of both technologies are analyzed and a reasonable application area of cylinder deactivation in the engine operation map is pointed out. In the conclusion, the achievable fuel consumption benefits will be presented.
Meta TagsDetails
DOI
https://doi.org/10.4271/2012-01-0160
Pages
9
Citation
Flierl, R., Lauer, F., Breuer, M., and Hannibal, W., "Cylinder Deactivation with Mechanically Fully Variable Valve Train," SAE Int. J. Engines 5(2):207-215, 2012, https://doi.org/10.4271/2012-01-0160.
Additional Details
Publisher
Published
Apr 16, 2012
Product Code
2012-01-0160
Content Type
Journal Article
Language
English