Magneti Marelli France

Micha&euml;l Pontoppidan

Separated air flow in the neighborhood of the leading edge of a butterfly valve plate in a throttle body fuel injection system can result in whistling. To alleviate the noise, a provided with an recess, or relief, on the suction side of the butterfly valve plate, near the leading edge. The recess has sides that are substantially radial lines starting at the outer periphery of the valve plate and extending toward the center of the valve plate. At their centermost ends, they are connected by a substantially straight line running parallel to the axis of rotation of the butterfly valve plate.

Throttle body comprising a butterfly with a spot face

The invention concerns an intake manifold ( ) comprising a plenum ( ) and air ducts ( ) one of which at least, for each combustion chamber of the engine, has a sudden enlargement ( ) of its passage cross-section, immediately followed in downstream direction by a duct portion ( ) having a gradually decreasing cross-section and ending ( ) upstream of a flange fixing ( ) the manifold ( ) to the engine and its cylinder head. The plenum ( ) and each of the air ducts ( ) at least are made of synthetic material, preferably capable of being molded. The invention is useful for equipping internal combustion engine with pistons driven in reciprocating movement in the cylinders.

Air intake manifold with sudden enlargement for internal combustion engine

The invention concerns a direct injection internal combustion engine comprising a camshaft and at least two cylinders ( ), having in each cylinder a mobile piston ( ) associated with at least to intake valves ( ), each located in an induction pipes ( ), and at least an exhaust valve ( ). The displacement of said valves is independent of the rotation of the camshaft and is controlled by a computer ( ). The induction pipes ( ) are designed to produce an air velocity field inside the cylinder ( ) parallel to said cylinder axis. The computer ( ) controls, cylinder by cylinder, the opening and closing times of said at lent two intake valves ( ) to adapt the shape of the air velocity field inside the cylinder ( ) to the engine power.

Direct-injection internal combustion engine with controlled valves

The invention concerns a combustion chamber delimited by a piston head having, inside a planar peripheral ring, a recess in the form of a concave bowl open towards the chamber and off-center on the piston axis (X&mdash;X) side which faces towards the injector inclined on the axis (X&mdash;X) and is laterally implanted on the cylinder head for direct injection into the chamber, and on the axis (X&mdash;X), a boss having, in layout, a horseshoe or crescent shape which partially enclosed the recess. The boss has an overhanging edge above the connection between the recess and the boss, whereof the upper surface is convex towards the chamber. The width of the overhanging edge is at its maximum in the horseshoe shaped boss base and gradually decreases until it substantially disappears at the tips of the two wings of the horseshoe-shaped boss, thereby ensuring a good preparation for the air/fuel mixture in the center of the chamber, opposite the axial plug at the chamber top. The invention is applicable to internal combustion engine with applied ignition and direct injection.

Piston with active guiding head, and associated combustion chamber

The injector comprises a tip having at least one outlet orifice (,) for fuel delivered to an engine combustion chamber. A ceramic coating (,) is deposited on the external face of the tip, preferably in a kink (,) bounding a recess in this external face, at least around and immediately downstream of the outlet orifice (,) relative to the direction in which the fuel is delivered. This invention is applicable to fuel injectors with a ceramic coating to protect against deposits of carbon oil for use with spark-ignition and direct injection internal combustion engines.

Growing community of inventors

Colombes, France

Michaël Pontoppidan

Growing community of inventors

Colombes, France

Micha&euml;l Pontoppidan

Michaël Pontoppidan