SYSTEM AND METHOD FOR CONTROLLING THE EMISSIONS OF A SPARK-IGNITION INTERNAL COMBUSTION ENGINE OF A MOTOR-VEHICLE

A system for controlling the emissions of a spark-ignition internal combustion engine of a motor-vehicle comprises first and second exhaust gas treatment devices (12, 13) and a secondary air feeding system (14; 20) for feeding secondary air into the exhaust gas conduit (11), between the first and se...

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Bibliographische Detailangaben
Hauptverfasser:	BEDOGNI, Mr. Fabio, PIVETTI, Mr. Gianluca, MUSU, Mr. Ettore
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A system for controlling the emissions of a spark-ignition internal combustion engine of a motor-vehicle comprises first and second exhaust gas treatment devices (12, 13) and a secondary air feeding system (14; 20) for feeding secondary air into the exhaust gas conduit (11), between the first and second exhaust gas treatment devices (12, 13). The secondary air feeding system (14; 20) is activated only when the load of the engine is greater than a predetermined load value and/or when the engine rotational speed is greater than a predetermined speed value. In this condition the air/fuel ratio of the engine is kept at a value lower than the stoichiometric value, so as to feed the engine with a rich mixture. In one example an electronic controller (E) is programmed for controlling the activation of the secondary air feeding system on the basis of a map, as a function of values of the engine load and the engine rotational speed. The map is predetermined depending upon the specific characteristics of the engine.