EXHAUST EMISSION CONTROL DEVICE OF ENGINE

PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an engine capable of properly increasing temperature of a first exhaust emission control catalyst and a second exhaust emission control catalyst.SOLUTION: When executing regeneration processing of repeating a cycle comprising a r...

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Bibliographische Detailangaben
Hauptverfasser:	KANAYAMA KUNIMI, HATAKE MICHIHIRO
Format:	Patent
Sprache:	eng ; jpn
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 PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an engine capable of properly increasing temperature of a first exhaust emission control catalyst and a second exhaust emission control catalyst.SOLUTION: When executing regeneration processing of repeating a cycle comprising a rich period and a lean period and regenerating a first exhaust emission control catalyst and a second exhaust emission control catalyst, an exhaust emission control device of an engine sets a target average air-fuel ratio for each one cycle of an air-fuel ratio of exhaust gas discharged from the second exhaust emission control catalyst, and also determines a fuel amount injected from a fuel injection valve as a post injection for the rich period on the basis of the target average air-fuel ratio.SELECTED DRAWING: Figure 4 【課題】第１の排気浄化触媒及び第２の排気浄化触媒を適切に昇温させることができるエンジンの排気浄化装置を提供する。【解決手段】リッチ期間とリーン期間とからなるサイクルを繰り返して第１の排気浄化触媒及び第２の排気浄化触媒を再生する再生処理を実行する際に、第２の排気浄化触媒から排出される排気の空燃比の１サイクル毎の目標平均空燃比を設定すると共に、この目標平均空燃比に基づいてリッチ期間にポスト噴射として燃料噴射弁から噴射される燃料量を決定する。【選択図】図４