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公开(公告)号：JP2002038920A
公开(公告)日：2002-02-06
申请号：JP2000221887
申请日：2000-07-24
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , HIROTA SHINYA , TANAKA TOSHIAKI , ASANUMA TAKAMITSU , NAKATANI KOICHIRO , KIMURA KOICHI
Abstract: PROBLEM TO BE SOLVED: To accurately diagnose the presence or absence of abnormality in a mechanism reversing the upstream and the downstream of a carrier carrying a fine grain oxidation remover. SOLUTION: An exhaust emission control device 50 is provided between the upstream 30u and the downstream 30d of an exhaust passage 30 in an engine 10. This exhaust emission control device 50 is provided with a switching part 51 and a carrier storage part 52. The upstream 30u and the downstream 30d of the exhaust passage 30 and a first and a second passage 52a, 52b of the carrier storage part 52 are respectively selectively connected by a valve 51d of the switching part 51. In this way, the upstream and the downstream of a DPR 60 stored in the carrier storage part 52 are reversed. When a differential pressure of an exhaust pressure detected by a pair of pressure sensors 55, 56 is an initial pressure loss or less which is a differential pressure under a condition with no exhaust gas component accumulated, presence of abnormality in the valve 51b is judged.
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公开(公告)号：JP2002013413A
公开(公告)日：2002-01-18
申请号：JP2001128288
申请日：2001-04-25
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , TANAKA TOSHIAKI , HIROTA SHINYA , ASANUMA TAKAMITSU , KIMURA KOICHI , NAKATANI KOICHIRO
Abstract: PROBLEM TO BE SOLVED: To realize temperature rise for SOX poisoning recovery of an NOX occlusion and reduction catalyst device arranged in an engine exhaust system, to absorb NOX when atmosphere in the neighbourhood is of a lean air-fuel ratio and to discharge NOX when it is of a logical air-fuel ratio or a rich air- fuel ratio in a short period of time. SOLUTION: This exhaust emission control device is furnished with a reversing means 71 to reverse the exhaust upstream side and the exhaust downstream side of the NOX occlusion and reduction catalyst device 70 and a supply means 74 to supply a reducing matter to the NOX occlusion and reduction catalyst device from the exhaust upstream side, supplies the reducing matter by the supply means for SOX poisoning recovery of the NOX occlusion and reduction catalyst device and reverses the exhaust upstream side and the exhaust downstream side of the NOX occlusion and reduction catalyst device by the reversing means.
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公开(公告)号：JP2002013411A
公开(公告)日：2002-01-18
申请号：JP2000402947
申请日：2000-12-28
Applicant: TOYOTA MOTOR CORP
Inventor： GOTO MASAHITO , SASAKI SHIZUO , YOSHIZAKI KOJI , ITO TAKEKAZU , ASANUMA TAKAMITSU , TANAKA TOSHIAKI , HIROTA SHINYA , ITO KAZUHIRO , KIMURA KOICHI , NAKATANI KOICHIRO
IPC: F02M25/07 , B01D46/42 , B01D53/94 , F01N3/02 , F01N3/24 , F01N9/00 , F02D21/06 , F02D21/08 , F02D23/00 , F02D41/02 , F02D41/14 , F02D41/22 , F02D41/38 , F02D45/00
Abstract: PROBLEM TO BE SOLVED: To prevent at least early blinding of a particulate filter as well as to prevent discharge of a large amount of particulates into the atmospheric air. SOLUTION: At least a part of exhaust gas by-passes the particulate filter while a valve system is changed over and changing-over of the valve system is stopped at the time when particulate discharge from an engine combustion chamber at a set point of time is large (step 102 and 104) on an exhaust gas purifying device of an internal combustion engine on which the particulate filter oxidizes the collected particulates, the valve system which is a reversing means is changed over at the set point of time and a first collecting surface and a second collecting surface of a collecting wall are alternately used to collect the particulates as the exhaust upstream side and the exhaust downstream side of the particulate filter are reversed.
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公开(公告)号：JP2002004837A
公开(公告)日：2002-01-09
申请号：JP2001045442
申请日：2001-02-21
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI , ITO KAZUHIRO , NAKATANI KOICHIRO , KIMURA KOICHI
IPC: F02B37/00 , B01D46/42 , B01D53/34 , B01D53/56 , B01D53/81 , B01D53/94 , F01N3/02 , F01N3/08 , F01N3/10 , F01N3/20 , F01N3/22 , F01N3/24 , F01N3/26 , F01N3/28 , F01N3/30 , F02B37/12 , F02D21/08 , F02D23/00 , F02D41/02 , F02D41/04 , F02D41/34 , F02D41/38 , F02D41/40 , F02D43/00 , F02M25/07
Abstract: PROBLEM TO BE SOLVED: To continuously oxidize and remove fine particles in exhaust gas on a particulate filter, which purifying NOX in exhaust gas. SOLUTION: A particulate filter 22, having NOX-absorbing function, is situated in an engine exhaust passage. The amount of discharge fine particles discharged per a unit time from a combustion chamber 5 is decreased to a value which is lower than an amount of oxidation removable fine particles, capable of being oxidized and removed per unit time without generating luminous flame at a position above the particulate filter 22. Furthermore, the temperature of the particulate filter 22 is maintained in a temperature range, in which NOX- absorption factor becomes higher than a fixed value.
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公开(公告)号：JP2001342820A
公开(公告)日：2001-12-14
申请号：JP2001091118
申请日：2001-03-27
Applicant: TOYOTA MOTOR CORP
Inventor： ITO KAZUHIRO , TANAKA TOSHIAKI , HIROTA SHINYA , ASANUMA TAKAMITSU , KIMURA KOICHI , NAKATANI KOICHIRO
IPC: F02M25/07 , F01N3/02 , F01N3/023 , F01N3/08 , F01N3/20 , F01N3/24 , F02B37/00 , F02D41/04 , F02D43/00
Abstract: PROBLEM TO BE SOLVED: To make innocuous toxic matter in exhaust emission flowing to the downstream side from a particulate filter in the case of backflow of exhaust emission by preventing most of fine particles from being collected on one side of a partition wall of a particulate filter, and exerting the oxidizing and removing action on the fine particles on the downstream of exhaust emission from the partition wall so that the action of sufficiently transmitting the action of oxidizing and removing fine particles collected on the partition wall by active oxygen is transmitted to all of the fine particle to inhibit the fine particles from being deposited on the partition wall. SOLUTION: An oxidizer 61 for emitting active oxygen for oxidizing fine particles 62 temporarily collected on the partition wall 54 of the particulate filter 22 is supported on the partition wall 54, the exhaust emission flow passing through the partition 54 is reversed to disperse the fine particles collected on the partition wall 54 to one side of partition wall and the other side of the partition wall, thereby lowering the possibility that the fine particles collected on the partition wall 54 are deposited without being oxidized and removed, and a filter 80 as a means for making innocuous toxic component in exhaust emission is disposed on the downstream of the exhaust emission flow from the particulate filter 22.
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Patent Agency Ranking
公开(公告)号：JP2001342819A
公开(公告)日：2001-12-14
申请号：JP2001091082
申请日：2001-03-27
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI , ITO KAZUHIRO , ASANUMA TAKAMITSU , NAKATANI KOICHIRO , KIMURA KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of preventing a particulate filter from being clogged with collected particulates. SOLUTION: This exhaust emission control device is provided with a particulate filter disposed in an engine exhaust system, and a by-pass passage allowing exhaust emission to by-pass the particulate filter. In the particulate filter, the collected particulates are oxidized, the particulate filter has oxidization removable fine particle quantity depending on the temperature of the particulate filter, and when the current exhaust gas state (step 102-104) is that the oxidization removable fine particle quantity of the particulate filter is made below the current required oxidization removable fine particle quantity (step 105), at least some of exhaust emission is forced to bypass by the bypass passage (step 107).
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公开(公告)号：JP2001317335A
公开(公告)日：2001-11-16
申请号：JP2000131655
申请日：2000-04-28
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI , ITO KAZUHIRO , ASANUMA TAKAMITSU , NAKATANI KOICHIRO , KIMURA KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine capable of further reliably and continuously burning the particulates trapped by a particulate filter and quickly raising the temperature of the particulate filter when it is required to increase the oxidizing/removing capability of particulates on the particulate filter. SOLUTION: This exhaust emission control device is provided with the filter carrying an active oxygen releasing agent accelerating the oxidation of the particulates in the exhaust gas and capable of temporarily trapping the particulates in the exhaust gas, and an exhaust switching means switching a first flow feeding the exhaust gas from one side of the filter and a second flow feeding the exhaust gas from the other side of the filter in turn. The temperature of the exhaust gas flowing into the filter differs when the first flow is used and when the second flow is used. The exhaust emission control device is also provided with a control means selecting the side having the higher temperature of the exhaust gas flowing into the filter between the first flow and the second flow when the temperature of the filter is low and the oxidation of the particulates must be accelerated.
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公开(公告)号：JP2001303937A
公开(公告)日：2001-10-31
申请号：JP2000275725
申请日：2000-09-11
Applicant: TOYOTA MOTOR CORP
Inventor： ASANUMA TAKAMITSU , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To detect the degree of thermal deterioration of a storage and reduction type NOx catalyst. SOLUTION: This exhaust emission control device for an internal combustion engine having the storage and reduction type NOx catalyst 17 in an exhaust pipe 16 for the lean-combustible internal combustion engine comprises an incoming gas SOx sensor 23 provided at the upstream side of the NOx catalyst 17 and an outgoing gas SOx sensor 24 and an air/fuel ratio sensor 27 at the downstream side. SOx poisoning recovery treatment is executed to the NOx catalyst 17, and right after almost complete poisoning recovery, saturated NOx release treatment is executed to the NOx catalyst 17 and a change-to-rich time is measured and compared with a change-to-rich time for a new NOx catalyst 17 for judging the degree of thermal deterioration in accordance with the comparison value. Otherwise, the NOx clean-up rate of the NOx catalyst is measured for judging the degree of thermal deterioration. When the degree of thermal deterioration exceeds a preset level, thermal deterioration inhibiting means is operated for inhibiting further thermal deterioration.
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公开(公告)号：JP2001289034A
公开(公告)日：2001-10-19
申请号：JP2000113261
申请日：2000-04-10
Applicant: TOYOTA MOTOR CORP
Inventor： NAKATANI KOICHIRO , TANAKA TOSHIAKI , HIROTA SHINYA , ITO KAZUHIRO , KIMURA KOICHI
Abstract: PROBLEM TO BE SOLVED: To continuously and oxidatively remove particulates in exhaust gas on a particulate filter. SOLUTION: The particulate filter 22 is arranged in an engine exhaust passage. When the engine is in such as operation state as having a possibility of exceeding the oxidatively removable particulate amount where the exhaust particulate amount exhausted from a combustion chamber 5 per a unit hour can be oxidatively removed on the particulate filter 22 without emitting a luminous flame per the unit hour, at least, either of the exhausted particulate amount or the oxidatively removable particulate amount is so controlled that the exhausted particulate amount becomes less than the oxidatively removable particulate amount. The particulates in the exhaust gas can be thus continuously oxidatively removed on the particulate filter 22 without emitting a luminous flame.
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公开(公告)号：JP2001200715A
公开(公告)日：2001-07-27
申请号：JP2000010387
申请日：2000-01-17
Applicant: TOYOTA MOTOR CORP
Inventor： NAKATANI KOICHIRO , TANAKA TOSHIAKI , ITO KAZUHIRO
Abstract: PROBLEM TO BE SOLVED: To enable ignition of particulates for combustion, caught even in the low-temperature combustion conditions. SOLUTION: A particulate filter 10 is arranged in an exhaust passage 6 of a diesel engine body 2. The particulate filter 10 carries NOx absorbent 26. In the case of operation in the low-temperature combustion condition where the particulate are accumulated, an additive, including the alkali metal element and alkali earth metal element, is supplied from an additive supplying device 12, so that the particulates caught by the particulate filter can be made to burn even at low-temperature conditions.
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