Abstract
By variation of the compression ratio the fuel consumption of high boosted gasoline engines can be reduced. The two-stage VCR system (variable compression ratio) enables a high share of fuel saving potential relative to full variable systems. FEV has evaluated different known and new two-stage VCR systems. Considering a low cost manufacturability and a beneficial integratability into common engine architectures the length-adjustable conrod using an eccentric piston pin in the small eye has proved as a favorable concept. The adjustment is performed by a combination of gas and mass forces.
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