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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| creator | HOSAKA YUICHI |
| description | 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 |
| format | Patent |
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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. 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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. 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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</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE |
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