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公开(公告)号：JP2001012260A
公开(公告)日：2001-01-16
申请号：JP18194799
申请日：1999-06-28
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TOSHIOKA TOSHISUKE , ASANUMA TAKAMITSU , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To perform various controls by a single exhaust control valve. SOLUTION: An exhaust control valve 23 and a pair of exhaust gas discharge ports 25a, 26a are provided in the outlet of an exhaust pipe 21 connected to an engine exhaust port. The exhaust control valve 23 is controlled to three positions of a position S1 making exhaust gas flowing out of the outlet of the exhaust pipe 21 flow in one exhaust gas discharge port 25a, position S2 making exhaust gas flowing out of the outlet of the exhaust pipe 21 flow in the other exhaust gas discharge port 26a, and a position almost fully closing the outlet of the exhaust pipe 21.
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公开(公告)号：JP2001012229A
公开(公告)日：2001-01-16
申请号：JP17701199
申请日：1999-06-23
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , TANAKA TOSHIAKI
IPC: F01N3/02 , B01D53/92 , F01N3/01 , F01N3/022 , F01N3/023 , F01N3/033 , F01N3/035 , F01N3/08 , F01N3/24 , F01N13/02
Abstract: PROBLEM TO BE SOLVED: To prevent pressure loss of exhaust by clogging of a scavenging material by restraining formation of ash on an exhaust emission control device furnished with the scavenging material to scavenge a particulate matter contained in the exhaust discharged from an internal combustion engine. SOLUTION: An exhaust emission control device of an internal combustion engine 1 is furnished with a scavenging material to scavenge a particulate matter contained in exhaust discharged from the internal combustion engine 1, and the scavenging material is constituted by supporting metal having electronegativity of not more than the same of a specified component contained in fuel and/or lubricating oil of the internal combustion engine 1.
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公开(公告)号：JP2001003729A
公开(公告)日：2001-01-09
申请号：JP17284899
申请日：1999-06-18
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To prevent increase in size and complicatedness of a device and to surely supply a desired amount of a reducing agent by varying the capacity of a reducing agent storeroom according to the storage amount of the reducing agent. SOLUTION: A reducing agent storing tank 12 is provided with a reducing agent storing container 121 built in an enclosure 120. As the reducing agent storing container 121 is formed of expansible material, the capacity is varied according to the amount of stored material and the internal pressure. A solid reducing agent in the reducing agent storing container 121 is heat-exchanged with cooling water and gasified. At that time, the pressure in the reducing agent storing container 121 is increased by a temperature rise due to heat exchange and gasification of the reducing agent, so that the gasified reducing agent (reducing gas) is force-fed to a reducing agent supply pipe through a reducing agent discharge port 122. The pressure of cooling water flowing through a gap 125 is applied to the reducing agent storing container 121 in addition to the shrinkage force of the container itself, so that even if the reducing agent storage amount is decreased, the pressure is not lowered. Accordingly, all of the reducing agent in the reducing agent storing tank 12 can be surely supplied to an exhaust pipe without a pump.
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公开(公告)号：JP2000265828A
公开(公告)日：2000-09-26
申请号：JP6569299
申请日：1999-03-11
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, capable of purifying NOx in a range of operation areas as wider as possible as compared with that in the past. SOLUTION: An NOx absorption and reduction catalyst 3 capable of occluding NOx when the air-fuel ratio of exhaust gas is lean, and of emitting and reducing occluded NOx when the oxygen concentration in exhaust gas is lowered, is provided for the exhaust passage of a lean combustion type internal combustion engine, and the engine is also provided with an urea selective reducing catalyst 4 capable of letting reduction take place while urea is being added, and it is so devised that exhaust emission control is performed by two catalysts while they are mutually compensating for exhaust emission control roughly in the whole range of operation areas for the internal combustion engine.
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公开(公告)号：JP2000170525A
公开(公告)日：2000-06-20
申请号：JP35181198
申请日：1998-12-10
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To efficiently reduce/discharge SOx absorbed by an NOx catalyst SO2. SOLUTION: When the specified amount of SOx is absorbed by an NOx catalyst 17 and an ECU 30 determines an SOx discharging time, to discharge SOx from the NOx catalyst 17, the ECU 30 controls the air-fuel ratio of exhaust gas flowing into the NOx catalyst 17 such that an exhaust air-fuel ratio in the outlet of the NOx catalyst 17 reaches a stoichiometric point, and performs exhaust gas temperature control for maintaining exhaust gas at a specified temperature or higher.
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Patent Agency Ranking
公开(公告)号：JP2000110547A
公开(公告)日：2000-04-18
申请号：JP28570298
申请日：1998-10-07
Applicant: TOYOTA MOTOR CORP
Inventor： IWASAKI EIJI , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To easily connect and disconnect a filter device to and from an exhaust pipe and to easily regenerate and treat it. SOLUTION: A cylindrical filter 5 is furnished in the inside of a cylindrical main body 4 to be connected to an exhaust pipe free to connect and disconnect in the pipe axial direction, and the filter is regenerated by detaching it from the axial direction of the exhaust pipe. The cylindrical filter in the cylindrical main body captures particulator materials (particulate materials) in exhaust gas passing through an exhaust gas passage 10 provided on the cylindrical main body. At the time of regeneration, the particulator materials captured by reversing the filter, etc., are removed.
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公开(公告)号：JP2000080913A
公开(公告)日：2000-03-21
申请号：JP25254698
申请日：1998-09-07
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To prevent any nitrogen oxide once emitted out of a nitrogen-oxide absorbent from being absorbed by this absorbent again. SOLUTION: A catalytic converter is equipped with a plurality of cells demarcated by a cellular wall 14 almost parallelly extending to an exhaust passage axis, and it is so constituted that an upstream end open cell 16u where an exhaust upstream end 15u is opened and an exhaust downstream end 15d is closed, and a downstream end open cell 16d where the exhaust upstream end 15u is closed and the exhaust downstream end 15d is opened both are alternately and repeatedly placed side by side. When an air-fuel ratio of incoming exhaust is in a lean side, a nitrogen-oxide absorbent 10 which absorbs nitrogen oxide when an air-fuel ratio of incoming exhaust is in a lean side, and emits the nitrogen oxide being once absorbed when oxygen content in the incoming exhaust is lowered, is set up in each inner wall surface of the upstream end open cell 16u and the downstream end open cell 16d. When the nitrogen oxide should be emitted out of the NOX absorbent 10, the air-fuel ratio to be taken into the NOX absorbent 10 is temporarily set to a rich side.
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公开(公告)号：JP2000027624A
公开(公告)日：2000-01-25
申请号：JP19556798
申请日：1998-07-10
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To surely reduce sulfate. SOLUTION: An NOx catalyst 16 for reducing NOx in the oxidizing atmosphere is arranged in an exhaust passage, and a depositing material 19 is arranged in the downstream of the NOx catalyst 16. The depositing material 19 is provided with a porous carrier, and deposits a carbon included component from hydrocarbon contained in the exhaust for holding. Sulfate discharged from the NOx catalyst 16 is adsorbed by the carbon contained component in the depositing material 19 for reduction.
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公开(公告)号：JP2000018026A
公开(公告)日：2000-01-18
申请号：JP1102599
申请日：1999-01-19
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI , IGUCHI SATORU , TOSHIOKA TOSHISUKE
Abstract: PROBLEM TO BE SOLVED: To simplify the structure of an exhaust emission control device for separating and discharging SOX by making exhaust gas reversely flow into a storage reducing type NOX catalyst. SOLUTION: An exhaust pipe 9 connected to an engine 1 is connected to a first port of an exhaust switching valve 20 having four ports, an exhaust port 10 for discharging exhaust gas to the atmosphere is connected to a second port, an exhaust pipe 11 connected to an inlet 30a of a catalyst converter 30 is connected to a third port, and an exhaust pipe 12 connected to an outlet 30b of the catalyst converter 30 is connected to a fourth port. When the exhaust switching valve 20 is positioned in forward flow, the exhaust pipe 10 and the exhaust pipe 12 are connected to each other as well as connecting the exhaust pipe 9 and the exhaust pipe 11 to each other, and exhaust gas flows from the inlet 30a to the outlet 30b in the catalyst converter 20. When the exhaust switching valve 20 is positioned in reverse flow, the exhaust pipe 10 and the exhaust pipe 11 are connected to each other as well as connecting the exhaust pipe 9 and the exhaust pipe 12 to each other, and exhaust gas flows from the outlet 30b to the inlet 30a in the catalyst converter 20.
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公开(公告)号：JP2000008914A
公开(公告)日：2000-01-11
申请号：JP17894598
申请日：1998-06-25
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To reduce an amount of Nox discharged to the downstream of a catalyst by providing a reducing agent injection means for injecting a reducing agent inside a cylinder of an internal combustion engine and a injection timing change means for advancing a fuel injection timing at the specific time. SOLUTION: A catalyst 9 for reducing and cleaning a Nox discharged from an internal combustion engine 1 is attached to an exhaust passage 5. When the internal combustion engine 1 is in an accelerating operation state, a fuel is injected into a cylinder 2 from a fuel injection valve 8 at an earlier timing than a predetermined reference injection timing. An amount which is thermally decomposed, of the fuel earlier injected is greater than an amount which is thermally decomposed, of the fuel injected at the predetermined reference injection timing. The thermally decomposed fuel has high combustibility, Nox is easy to burn in the catalyst 9. Accordingly, as the reducing agent having high combustibility is supplied to the catalyst, a cleaning rate of exhaust gas in the catalyst can be kept high.
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