EXHAUST EMISSION CONTROL DEVICE OF ENGINE

PROBLEM TO BE SOLVED: To precisely control the exhaust gas flowing into an HC adsorbing catalyst to the reduction side while HC is desorbed from the HC adsorbing catalyst. SOLUTION: The exhaust emission control device comprises a three-way catalyst 25 including an oxygen absorbing material, disposed...

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Hauptverfasser:	KATOU YASUHIKO, KAWABATA HISAYA, NAKAMOTO JINJIYU, IMADA MICHIHIRO, SHIGETSU MASAHIKO
Format:	Patent
Sprache:	eng
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 LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To precisely control the exhaust gas flowing into an HC adsorbing catalyst to the reduction side while HC is desorbed from the HC adsorbing catalyst. SOLUTION: The exhaust emission control device comprises a three-way catalyst 25 including an oxygen absorbing material, disposed on the upstream side of the HC adsorbing catalyst 27, and a desorption determining means 42 for determining whether the operation condition is switched to the desorption operation condition in which the quantity of HC desorbed from the HC adsorbing material of the HC adsorbing catalyst 27 exceeds the quantity of HC adsorbed in the HC adsorbing material. When it is determined that the engine is in the desorption operation condition by the desorption determining means 42, the oxygen emission control is executed for controlling the exhaust gas on the upstream side of the HC adsorbing catalyst 27 to the reduction side so that oxygen is emitted from the oxygen absorbing material. Before the operation is switched to the oxygen emission control, the initial control is executed for reducing the quantity of oxygen absorbed in the oxygen absorbing material of the three-way catalyst 25.