Engine control system with rapid catalyst warm-up

The control method for an internal combustion engine having its exhaust coupled to a catalytic converter, involves retarding ignition timing from a nominal value during a period following engine start and returning the ignition timing to the nominal value by termination of the period. A mixture of a...

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Bibliographische Detailangaben
Hauptverfasser:	HUSAK, PHILIP WILLIAM, MEYER, DANIEL LAWRENCE, WHITTIER, STEVEN RAY, HAMBURG, DOUGLAS RAY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION 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 GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	The control method for an internal combustion engine having its exhaust coupled to a catalytic converter, involves retarding ignition timing from a nominal value during a period following engine start and returning the ignition timing to the nominal value by termination of the period. A mixture of air and fuel inducted into the engine is offset by a predetermined amount in a lean direction during the period to shift engine exhaust gas mixture towards an air/fuel ratio lean of stoichiometry by a preselected amount. The predetermined air/fuel mixture offset by a correction value is then corrected so that the exhaust gas mixture is shifted more closely to the lean offset from stoichiometry. The further involves returning the ignition timing to the nominal value during the period in response to a demand for engine power from a vehicle operator. The ignition timing is retarded during the period in response to at least one of vehicle speed and engine rpm deceleration, the ignition timing retardation being a function of the at least one of vehicle speed and engine rpm during the deceleration.