Volvo Car Corporation

Henrik Oest Simonsen

Ingemar Denbratt

Jonny Nisbet

Lars-Olof Carlsson

Internal combustion engine with fuel injection directly into the combustion chamber of the engine. The engine has inlet channels, the angle of incidence (valve angle) (&agr;) of which is greater than 20&deg; relative to the longitudinal axis of the cylinder chamber. The piston tops are made, firstly, with a surface portion inclined relative to a plane normal to the longitudinal axis of the cylinder chamber by an angle (&ggr;) equal to or less than the angle of incidence of the inlet channel, and, secondly, with a cavity connected to the inclined surface portion. By interaction between the angle of incidence of the inlet channels and the shape of the piston tops, there is generated in the combustion chambers a primary vortical movement in the inlet air about an axis perpendicular to the longitudinal axis of the cylinder chamber. The primary vortical movement generates a secondary vortical movement in the opposite direction in the piston cavity.

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Molndal, Sweden

Henrik Oest Simonsen