Device for purifying the exhaust gas of an internal combustion engine
First Claim
1. A device for purifying the exhaust gas of an internal combustion engine comprising:
- a particulate filter arranged in the exhaust system on which the trapped particulates are oxidized, reversing means for reversing the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter, and improving means for improving the amount of particulates that can be oxidized and removed on said particulate filter, wherein said particulate filter has a trapping wall, said trapping wall has a first trapping surface and a second trapping surface, said reversing means reverses the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter so that said first trapping surface and said second trapping surface are used alternately to trap the particulates, wherein said particulate filter carries an active-oxygen releasing agent on said first and second trapping surfaces, and active-oxygen released from said active-oxygen releasing agent oxidizes the trapped particulates on said particulate filter.
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Accused Products
Abstract
A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device has a particulate filter arranged in the exhaust system on which the trapped particulates are oxidized, and a reversing mechanism for reversing the exhaust gas upstream side and the exhaust gas downstream side of the particulate filter. The particulate filter has a trapping wall. The trapping wall has a first trapping surface and a second trapping surface. The reversing mechanism reverses the exhaust gas upstream side and the exhaust gas downstream side of the particulate filter so that the first trapping surface and the second trapping surface are used alternately to trap the particulates. The device can improve the amount of particulates that can be oxidized and removed on the particulate filter.
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Citations
21 Claims
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1. A device for purifying the exhaust gas of an internal combustion engine comprising:
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a particulate filter arranged in the exhaust system on which the trapped particulates are oxidized, reversing means for reversing the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter, and improving means for improving the amount of particulates that can be oxidized and removed on said particulate filter, wherein said particulate filter has a trapping wall, said trapping wall has a first trapping surface and a second trapping surface, said reversing means reverses the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter so that said first trapping surface and said second trapping surface are used alternately to trap the particulates, wherein said particulate filter carries an active-oxygen releasing agent on said first and second trapping surfaces, and active-oxygen released from said active-oxygen releasing agent oxidizes the trapped particulates on said particulate filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. A device for purifying the exhaust gas of an internal combustion engine comprising a particulate filter arranged in the exhaust system on which the trapped particulates are oxidized, and reversing means for reversing the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter, wherein said particulate filter carries an active-oxygen releasing agent, active-oxygen released from said active-oxygen releasing agent oxidizes the trapped particulates on said particulate filter, said active-oxygen releasing agent holds NOX to combine the NOX with oxygen when excessive oxygen is present in the surroundings and releases to decompose the combined NOX and oxygen into NOX and active-oxygen when the oxygen concentration in the surroundings drops, said particulate filter has a trapping wall, said trapping wall has a first trapping surface and a second trapping surface, wherein said first and second trapping surfaces carry the active-oxygen releasing agent, said reversing means reverses the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter so that said first trapping surface and said second trapping surface are used alternately to trap the particulates, and said device further comprises improving means for improving the amount of particulates that can be oxidized and removed of said particulate filter by making said oxygen concentration in said surroundings drop to release NOX from said active-oxygen releasing agent.
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20. A device for purifying the exhaust gas of an internal combustion engine comprising:
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a particulate filter arranged in the exhaust system on which the trapped particulates are oxidized, the particulate filter carries an active-oxygen releasing agent, and active-oxygen released from said active-oxygen releasing agent oxidizes the trapped particulates on said particulate filter, and reversing means for reversing the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter, wherein said particulate filter has a trapping wall, said trapping wall has a first trapping surface and a second trapping surface, wherein said first and second trapping surfaces carry the active-oxygen releasing agent, said reversing means reverses the exhaust gas upstream side and the exhaust gas downstream side of said particulate filter so that said first trapping surface and said second trapping surface are used alternately to trap the particulates, said particulate filter has an oxidation ability and the both end portions of said particulate filter have the oxidization ability higher than that of the central portion of said particulate filter. - View Dependent Claims (21)
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Specification