IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0168326
(2001-09-18)
|
우선권정보 |
JP-0350587 (2000-11-17); JP-0219667 (2001-07-19) |
국제출원번호 |
PCT/JP01/08115
(2002-06-20)
|
국제공개번호 |
WO02/40836
(2002-05-23)
|
발명자
/ 주소 |
- Kato, Zenichiro
- Yanagihara, Hiromichi
- Sugiyama, Toshihisa
- Henda, Yoshimitsu
- Shiratani, Kazuhiko
- Kuroki, Rentaro
|
출원인 / 주소 |
- Toyota Jidosha Kabushiki Kaisha
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
12 인용 특허 :
10 |
초록
▼
A first heat-resistant filter medium is disposed in an exhaust pathway of an internal combustion engine. The first heat-resistant filter medium traps hydrocarbon compounds and carbon-containing particulates included in a flow of exhaust gas in a dispersive manner to bring the respective particulates
A first heat-resistant filter medium is disposed in an exhaust pathway of an internal combustion engine. The first heat-resistant filter medium traps hydrocarbon compounds and carbon-containing particulates included in a flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas. The trapped hydrocarbon compounds and the trapped carbon-containing particulates are subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates. A second heat-resistant filter medium is further disposed downstream of the first heat-resistant filter medium to trap the remaining carbon-containing particulates, which have not been trapped by the first heat-resistant filter medium but have passed through the first heat-resistant filter medium. This arrangement desirably enhances the reduction rate of the particulates.
대표청구항
▼
1. An emission control device that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, that comprises a plurality of combustion chambers, an exhaust manifold that unites flows of exhaust gas from said plurality of combustion chambers to at lea
1. An emission control device that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, that comprises a plurality of combustion chambers, an exhaust manifold that unites flows of exhaust gas from said plurality of combustion chambers to at least one joint flow, and an exhaust pipe that leads the joint flow of exhaust gas united by said exhaust manifold to the air, said emission control device comprising:a first heat-resistant filter medium that traps hydrocarbon compounds and the carbon-containing particulates included in the flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby makes the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates, said first heat-resistant filter medium being disposed in said exhaust manifold, anda second heat-resistant filter medium that traps the remaining carbon-containing particulates, which have not been trapped by said first heat-resistant filter medium but have passed through said first heat-resistant filter medium, said second heat-resistant filter medium being disposed in said exhaust pipe. 2. An emission control device in accordance with claim 1, wherein said second heat-resistant filter medium is capable of trapping the remaining carbon-containing particulates, which are smaller in size than the carbon-containing particulates collectable by said first heat-resistant filter medium. 3. An emission control device in accordance with claim 1, wherein said first heat-resistant filter medium is disposed at a specific position where the flows of exhaust gas from said plurality of combustion chambers are united to the at least one joint flow, in said exhaust manifold. 4. An emission control device that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, that comprises a plurality of combustion chambers, an exhaust manifold that unites flows of exhaust gas from said plurality of combustion chambers to at least one joint flow, and an exhaust pipe that leads the joint flow of exhaust gas united by said exhaust manifold to the air, said emission control device comprising:a first heat-resistant filter medium that traps hydrocarbon compounds and the carbon-containing particulates included in the flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby makes the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates; and said first heat-resistant filter medium being disposed in said exhaust manifold, anda second heat-resistant filter medium that traps the remaining carbon-containing particulates, which have not been trapped by said first heat-resistant filter medium but have passed through said first heat-resistant filter medium, said second heat-resistant filter medium being disposed in said exhaust pipe;wherein said first heat-resistant filter medium does not trap most of metal sulfate particulates but allows passage of the metal sulfate particulates therethrough, the metal sulfate particulates being produced from metal components added to lubricating oil of said internal combustion engine and sulfur in a fuel of said internal combustion engine and being suspended in the flow of exhaust gas. 5. An emission control device that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, said emission control device comprising:a first heat-resistant filter medium that tr aps hydrocarbon compounds and the carbon-containing particulates included in the flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby makes the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates;a second heat-resistant filter medium that traps the remaining carbon-containing particulates, which have not been trapped by said first heat-resistant filter medium but have passed through said first heat-resistant filter medium; anda vane that is located on a pathway of the flow of exhaust gas from said internal combustion engine, is driven by the flow of exhaust gas, and breaks down the particulates included in the flow of exhaust gas,wherein said first heat-resistant filter medium is disposed upstream of said vane, andsaid second heat-resistant filter medium is disposed downstream of said vane. 6. An emission control device in accordance with claim 5, wherein said internal combustion engine is provided with a supercharger that utilizes fluidization energy of the exhaust gas to supercharge intake air of said internal combustion engine, andsaid vane is a turbine of said supercharger actuated by the flow of exhaust gas. 7. An emission control device in accordance with claim 1, said emission control device further comprising a control catalyst that is disposed in back wash of said second heat-resistant filter medium to reduce air pollutants flown with the exhaust gas out of said emission control device. 8. An emission control device in accordance with claim 1, wherein said second heat-resistant filter medium has an active oxygen release agent carried thereon, the active oxygen release agent taking in and holding oxygen in the presence of excess oxygen in its atmosphere and releasing the oxygen held therein as active oxygen with a decrease in concentration of oxygen in the atmosphere. 9. An emission control device that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, said emission control device comprising:a first heat-resistant filter medium that traps hydrocarbon compounds and the carbon-containing particulates included in the flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby makes the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates; anda second heat-resistant filter medium that traps the remaining carbon-containing particulates, which have not been trapped by said first heat-resistant filter medium but have passed through said first heat-resistant filter medium;wherein said second heat-resistant filter medium has an active oxygen release agent carried thereon, the active oxygen release agent taking in and holding oxygen in the presence of excess oxygen in its atmosphere and releasing the oxygen held therein as active oxygen with a decrease in concentration of oxygen in the atmosphere, andwherein said second heat-resistant filter medium has a noble metal catalyst belonging to a platinum group carried thereon, in addition to the active oxygen release agent. 10. An emission control device that reduces carbon-containing particulates, which are included in a flow of exhaust gas with a variation in flow rate emitted from an internal combustion engine, using a filter material having a large number of pores tangled in a three-dimensional manner, said emission control device comprising:a first heat-resistant filter medium that is composed of the filter material, makes the exhaust gas flown int o the pores, which are greater in size than the carbon-containing particulates, and causes the carbon-containing particulates to collide with and adhere to regions defining the pores of the filter material, thereby trapping the carbon-containing particulates;a second heat-resistant filter medium that filters the flow of exhaust gas passing through said first heat-resistant filter medium to trap the remaining carbon-containing particulates included in the flow of exhaust gas; anda flow rate variation mitigation module that mitigates the variation in flow rate of the exhaust gas flown into said second heat-resistant filter medium;wherein said first heat-resistant filter medium traps hydrocarbon compounds and the carbon-containing particulates included in the flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby makes the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates, andsaid second heat-resistant filter medium has an active oxygen release agent carried thereon, the active oxygen release agent taking in and holding oxygen in the presence of excess oxygen in its atmosphere and releasing the oxygen held therein as active oxygen with a decrease in concentration of oxygen in the atmosphere. 11. An emission control device in accordance with claim 10, wherein said flow rate variation mitigation module comprises a supercharger that is actuated by fluidization energy of the exhaust gas and supercharges intake air of said internal combustion engine. 12. An emission control device in accordance with claim 11, wherein said flow rate variation mitigation module further comprises a flow-restriction element that is disposed in back wash of said second heat-resistant filter medium to restrict the flow of the exhaust gas. 13. An emission control device in accordance with claim 12, wherein said flow-restriction element is a control catalyst that reduces air pollutants included in the flow of exhaust gas passing through said second heat-resistant filter medium. 14. An emission control method that reduces carbon-containing particulates included in a flow of exhaust gas from an internal combustion engine, said emission control method comprising the steps of:uniting flows of exhaust gas from a plurality of combustion chambers of said internal combustion engine to at least one joint flow in an exhaust manifold;using a first heat-resistant filter medium disposed in said exhaust manifold to trap hydrocarbon compounds and the carbon-containing particulates included in the united flow of exhaust gas in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas; making the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having an inflow temperature into said first heat-resistant filter medium lower than a combustible temperature of the carbon-containing particulates; andusing a second heat-resistant filter medium disposed in an exhaust pipe to trap the remaining carbon-containing particulates, which have not been trapped by said first heat-resistant filter medium but have passed through said first heat-resistant filter medium, in said exhaust pipe through which the exhaust gas that has passed through the first heat-resistant filter medium is released to the air. 15. An emission control method that reduces hydrocarbon compounds and carbon-containing particulates, which are included in a flow of exhaust gas with a variation in flow rate emitted from an internal combustion engine, using a filter material having a large number of pores tangled in a three-dimensional manner, said emission control method comprising the steps of:making the exhaust gas flow into pores of a first heat-resistant filter medium that is composed of the filter material, the pores of the first heat-resistant filter medium greater in size than the carbon-containing particulates, and causing the carbon-containing particulates to collide with and adhere to regions defining the pores of the filter material, thereby trapping the hydrocarbon compounds and the carbon-containing particulates in a dispersive manner to bring the respective particulates and hydrocarbon compounds in contact with oxygen included in the exhaust gas, and thereby making the trapped hydrocarbon compounds and the trapped carbon-containing particulates subjected to combustion with the exhaust gas having a filter inflow temperature lower than a combustible temperature of the carbon-containing particulates;mitigating the variation in flow rate of the exhaust gas; andfiltering the flow of exhaust gas with the mitigated variation in flow rate through a second heat-resistant filter medium with an active oxygen release agent carried thereon, the active oxygen release agent taking in and holding oxygen in the presence of excess oxygen in its atmosphere and releasing the oxygen held therein as active oxygen with a decrease in concentration of oxygen in the atmosphere, thereby trapping the remaining carbon-containing particulates included in the flow of exhaust gas.
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