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.
Cylinder Deactivation with Mechanically Fully Variable Valve Train
Sae Int. J. Engines
SAE 2012 World Congress & Exhibition ; 2012
Sae International Journal of Engines ; 5 , 2 ; 207-215
16.04.2012
9 pages
Aufsatz (Konferenz)
Englisch
Cylinder Deactivation with Mechanically Fully Variable Valve Train
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