Volvo Car Corporation

Magnus Gustavsson

Jonny Nisbet

Stefan Str&ouml;mberg

A combustion system for engines having at least one cylinder ( ). The system may e.g. consist of an exhaust duct, an intake duct ( ), a cylinder chamber ( ), a fuel injector for injecting fuel into the cylinder chamber ( ), a piston ( ) performing a reciprocating motion in the cylinder chamber ( ), and a valve ( ) for intake and one for exhaust. The intake duct ( ) is connected to the cylinder chamber ( ) and said intake valve ( ) is operative to open and close, respectively, the connection between the intake duct ( ) and the cylinder chamber ( ). The crown ( ) of the piston ( ) is provided with a cavity ( ), shaped so as to enhance the generation of tumbling inside the cylinder chamber ( ) during the intake stroke and to contribute to the breakdown during the compression stroke inside the cylinder chamber ( ). The intake duct ( ) has an intermittent curve coinciding with the direction of the valve ( ), where a longitudinal axis ( ) of the valve ( ) is angled towards the top ( ) of the cylinder chamber ( ), for generating the tumbling effect inside the cylinder chamber ( ).

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Hindås, Sweden

Magnus Gustavsson