Peugeot Citroen Automobiles Sa

Institute Francais Du Petrole

Ali Chaouche

Piet Ameloot

Djamal Medioun

Mickael Gascoin

Gaetan Monnier

Claire Vermonet

Yvon Beauge

Stephane Henriot

David Gimbres

Jean-Pierre Chemisky

A system for assisting regeneration of a storage/release NOx trap integrated in an exhaust line () of a motor vehicle diesel engine () is characterized in that it comprises gas admission means for admitting gas into the engine, means for injecting fuel () into the cylinders thereof in the form of at least pilot and main injections, and means for controlling () said gas admission and/or fuel injection means for periodically switching the engine () between a lean-mixture standard operating mode in which NOx is stored in the trap () and a rich-mixture regeneration operating mode, with at least two pilot injections () and one main injection (), in which NOx is released from the trap () and the trap is regenerated.

System for assisting regeneration of a storage/release NOx trap for a motor vehicle diesel engine

This system for assisting regeneration of a storage/release NOtrap integrated into an exhaust system () of a motor vehicle diesel engine () is characterized in that it includes means () for injecting fuel into the cylinders of the engine () in the form of pilot injections and main injections and means () for controlling the injection means () to switch the engine () periodically from a standard mode of operation using a lean mixture and pilot injection and main injection, in which NOare stored in the trap (), to a regeneration mode of operation using a rich mixture, with at least two pilot or main injections depending on the engine load, in which NO, are released from the trap () and the trap is regenerated.

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The present invention relates to an applied ignition internal combustion engine having at least one cylinder in which a piston slides along the cylinder axis, with a cylinder head capping the cylinder and, together with the piston and cylinder, defining a combustion chamber. The piston has a recess open toward the cylinder head, the recess having several shapes of an ellipsoid section along a transverse plane of the piston, of which the main axis and generatrices are substantially parallel to the lengthwise axis of the piston in order to reduce the area-volume ratios in the combustion chamber and increase turbulence levels at the end of the compression cycle. The ellipse or ellipses is or are such that:

Applied ignition internal combustion engine whose pistons have

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Paris, France

Ali Chaouche