To enable warming-up of a selective reduction catalyst, while suppressing slip of ammonia adsorbed in the selective reduction catalyst, in the time of starting an internal combustion engine including the time of restarting.SOLUTION: An E/G-ECU 200 injects urea water from a urea addition valve 80 so that ammonia is adsorbed on an SCR catalyst 74 when an engine 1 is stopped. Then, the E/G-ECU determines and controls the operating state of the engine 1 so that when the engine 1 is started, a release ammonia amount separated from the SCR catalyst 74 due to the temperature rise of the SCR catalyst 74 does not exceed an amount consumed by purification of NOx discharged from the engine 1.SELECTED DRAWING: Figure 2
【課題】再始動時を含む、内燃機関の始動時において、選択還元触媒に吸着されていたアンモニアのスリップを抑止しつつ、選択還元触媒の暖機を可能とする。【解決手段】E/G-ECU200は、エンジン1の停止時にSCR触媒74にアンモニアが吸着されるよう、尿素添加弁80から尿素水を噴射する。そして、エンジン1の始動時に、SCR触媒74の温度上昇に伴いSCR触媒74から脱離する放出アンモニア量が、エンジン1から排出されたNOxの浄化によって消費される量を超えないように、エンジン1の運転状態を決定し、制御する。【選択図】図2
EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE, AND EXHAUST PURIFICATION METHOD OF INTERNAL COMBUSTION ENGINE
内燃機関の排気浄化システムおよび内燃機関の排気浄化方法
2022-10-03
Patent
Electronic Resource
Japanese
IPC: | F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen |
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