EXHAUST EMISSION CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE

To improve diagnosis accuracy for deterioration of an SCR converter.SOLUTION: An exhaust emission control system of an internal combustion engine is configured to determine that an SCR converter deteriorates in a case where an outflowing ammonia concentration AC at the time when a specified period ε...

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Bibliographische Detailangaben
Hauptverfasser:	MORI KOHEI, FUKURODA TAKASHI, MATSUSHITA TOMOHIKO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING 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 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:	To improve diagnosis accuracy for deterioration of an SCR converter.SOLUTION: An exhaust emission control system of an internal combustion engine is configured to determine that an SCR converter deteriorates in a case where an outflowing ammonia concentration AC at the time when a specified period ε has elapsed since an ammonia slip has been confirmed is equal to or higher than a deterioration determination concentration ζ (S200: YES), in addition to a case where a lapse time T1 from the start of ammonia supply (S120) to the confirmation of the ammonia slip (S150: YES) is shorter than a deterioration determination time γ (S170: YES).SELECTED DRAWING: Figure 2 【課題】ＳＣＲコンバータの劣化の診断精度を向上する。【解決手段】アンモニア供給の開始（Ｓ１２０）からアンモニアスリップが確認されるまで（Ｓ１５０：ＹＥＳ）の経過時間Ｔ１が劣化判定時間γ未満である（Ｓ１７０：ＹＥＳ）ことに加え、更にアンモニアスリップが確認されてから規定期間εが経過した時点における流出アンモニア濃度ＡＣが劣化判定濃度ζ以上の場合（Ｓ２００：ＹＥＳ）にＳＣＲコンバータが劣化していると判定するようにした。【選択図】図２