EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To avoid deterioration of exhaust emission properties by accurately predicting NOxdesorption in an NOxtrap catalyst during a rich spike control, and by appropriately controlling the supply quantity of a reducing agent used at desorption of NOx. SOLUTION: During a period of time...

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Bibliographische Detailangaben
1. Verfasser:	HOSAKA YUICHI
Format:	Patent
Sprache:	eng
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 avoid deterioration of exhaust emission properties by accurately predicting NOxdesorption in an NOxtrap catalyst during a rich spike control, and by appropriately controlling the supply quantity of a reducing agent used at desorption of NOx. SOLUTION: During a period of time the reducing agent controls the desorption of NOxand an NOxdesorption speed (NOxdesorption quantity) is substantially fixed, immediately after the rich spike control, exhaust emission λ is fixed at a predetermined value and supply of the reduction agent is controlled. During the following time period, when adsorption/desorption of NOxis controlled according to Langmuir adsorption equation and the NOxdesorption speed is reduced, emission λ is made variable, according to the NOxdesorption rate and supply of the reduction agent is controlled. COPYRIGHT: (C)2009,JPO&INPIT