公开(公告)号：JP2002155793A

公开(公告)日：2002-05-31

申请号：JP2000357417

申请日：2000-11-24

Applicant: TOYOTA MOTOR CORP

Inventor： HAYASHI KOTARO ,  MATSUSHITA SOICHI ,  OKI HISASHI ,  MAGATA HISAFUMI ,  ISHIYAMA SHINOBU ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  ODA TOMIHISA ,  HARADA YASUO ,  NEGAMI AKIHIKO ,  MATSUOKA HIROKI ,  OTSUBO YASUHIKO ,  AOYAMA TARO ,  TAWARA ATSUSHI

IPC: F02D45/00 ,  F01N3/08 ,  F01N3/20 ,  F02D41/02 ,  F02D41/04

Abstract: PROBLEM TO BE SOLVED: To improve an exhaust emission control technology of an internal combustion engine by establishing a technology judging the state of deterioration of a NOx catalyst. SOLUTION: The exhaust emission control device is provided with a lean combustion type internal combustion engine 1; an NOx catalyst 20; an NOx purification control means 35 for executing NOx purification processing so as to release and reduce a nitrogen oxide absorbed by the NOx catalyst 20; a poisoning dissolving control means 35 for executing poisoning dissolving processing so as to dissolve poisoning of the NOx catalyst by an oxide; a poisoning dissolving processing number memory means 35 for memorizing the number of the poisoning dissolving processing executed by the poisoning dissolving control means 35; and a catalyst deterioration judgment means 35 for judging a deterioration state of the NOx catalyst based on the executed number of the poisoning dissolving processing memorized in the poisoning dissolving processing number memory means 35.

公开(公告)号：JP2002122019A

公开(公告)日：2002-04-26

申请号：JP2000316643

申请日：2000-10-17

Applicant: TOYOTA MOTOR CORP

Inventor： ODA TOMIHISA ,  MATSUSHITA SOICHI ,  OKI HISASHI ,  HAYASHI KOTARO ,  ISHIYAMA SHINOBU ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  MAGATA HISAFUMI ,  HARADA YASUO ,  NEGAMI AKIHIKO ,  MATSUOKA HIROKI ,  OTSUBO YASUHIKO ,  AOYAMA TARO ,  TAWARA ATSUSHI

IPC: F01N3/28 ,  F01N3/08 ,  F01N3/20

Abstract: PROBLEM TO BE SOLVED: To prevent degradation of a catalyst and deterioration of exhaust emission by supplying reducing agent, based on a bed temperature of a NOx catalyst. SOLUTION: This device is provided with the NOx catalyst 20, an operation state detection means for detecting the operation state of an internal combustion engine 1, an inlet gas temperature measuring means 37 for measuring the temperature of exhaust flowing into the NOx catalyst 20, an outlet gas temperature measuring means 24 for measuring the temperature of exhaust flowing out of the NOx catalyst 20, a catalyst bed temperature estimation means 35 by inlet gas for estimating the bed temperature of the NOx catalyst 20, based on the temperature of exhaust and the operating state, a reducing agent supply means 28 for supplying reducing agent based on the bed temperature of the NOx catalyst 20, a catalyst bed temperature detection means 35 by outlet gas for detecting the bed temperature of the NOx catalyst 20 based on the temperature of exhaust and an abnormality determining means for determining whether the NOx catalyst is abnormal.

公开(公告)号：JP2002106332A

公开(公告)日：2002-04-10

申请号：JP2001212889

申请日：2001-07-12

Applicant: TOYOTA MOTOR CORP

Inventor： SHIBATA DAISUKE ,  MATSUSHITA SOICHI ,  TSUKASAKI YUKIHIRO ,  MATSUOKA HIROKI ,  HAYASHI KOTARO ,  ISHIYAMA SHINOBU ,  OTSUBO YASUHIKO ,  MAGATA HISAFUMI ,  KOBAYASHI MASAAKI ,  NEGAMI AKIHIKO ,  ODA TOMIHISA ,  HARADA YASUO ,  ONO TOMOYUKI

IPC: B01D53/86 ,  B01D53/94 ,  F01N3/08 ,  F01N3/20 ,  F01N3/28 ,  F01N3/36 ,  F02B37/00 ,  F02M25/07

Abstract: PROBLEM TO BE SOLVED: To make the air fuel ratio in NOX catalyst close to the target air fuel ratio near stoichimetric air amount in the case of adding a reducer in an exhaust passage in the upstream of NOX catalyst. SOLUTION: This exhaust emission control device of an internal combustion engine is provided with the NOX catalyst 17 disposed in the exhaust passage 16 of a lean-burn internal combustion engine 1, a fuel additive supply means 19 disposed in the exhaust passage in the upstream of the NOX catalyst 17, a load detecting means for detecting load of the internal combustion engine, an addition quantity calculating means for calculating the fuel additive supply quantity used in one time NOX reducing process according to the load of the internal combustion engine, and a fuel addition control means for dividing the calculated quantity of fuel additive into plural times and adding the same. According to the degree of engine load, the quantity of added reducer is controlled. Addition of the reducer calculated according to the engine load is executed in plural times, the air fuel ratio on the NOX catalyst side is changed to repeat rich and lean burn near the stoichimetric air amount so that the average air fuel ratio in adding the reducer is adjusted to be near the stoichimetric air amount.

公开(公告)号：JP2002089350A

公开(公告)日：2002-03-27

申请号：JP2000272185

申请日：2000-09-07

Applicant: TOYOTA MOTOR CORP

Inventor： MAGATA HISAFUMI ,  MATSUSHITA SOICHI ,  OKI HISASHI ,  HAYASHI KOTARO ,  ISHIYAMA SHINOBU ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  ODA TOMIHISA ,  HARADA YASUO ,  NEGAMI AKIHIKO ,  MATSUOKA HIROKI ,  OTSUBO YASUHIKO ,  AOYAMA TARO ,  TAWARA ATSUSHI

IPC: F02D45/00 ,  F01N3/08 ,  F01N3/20 ,  F02B37/00 ,  F02D41/02 ,  F02D41/04 ,  F02D41/14

Abstract: PROBLEM TO BE SOLVED: To make possible proper feedback-control of an air-fuel ratio in an exhaust emission control device for an internal combustion engine and to prevent deterioration of exhaust gas emission by providing technology capable of correcting an output value of an air-fuel ratio sensor provided in an exhaust gas passage. SOLUTION: This exhaust emission control device is furnished with the lean combustion type internal combustion engine 1, an NOX catalyst 20 provided in the exhaust gas passage 19 of the internal combustion engine 1, an NOX purification control means 35 to carry out NOX purifying treatment to discharge and reduce nitrogen oxides absorbed in the NOX catalyst 20, a poisoning cancelling treatment to cancel poisoning by the oxides of the NOX catalyst 20, an air-fuel ratio measuring means 23 provided in the exhaust air passage 19 and to measure the air-fuel ratio of exhaust air and an air-fuel ratio correction means 35 to correct an output signal of the air-fuel ratio measuring means 23 thereafter in accordance with the output signal of the air-fuel ratio measuring means 23 in the middle of practicing the poisoning cancelling treatment.

公开(公告)号：JP2002081312A

公开(公告)日：2002-03-22

申请号：JP2000269232

申请日：2000-09-05

Applicant: TOYOTA MOTOR CORP

Inventor： MAGATA HISAFUMI ,  MATSUSHITA SOICHI ,  TSUKASAKI YUKIHIRO ,  MATSUOKA HIROKI ,  HAYASHI KOTARO ,  ISHIYAMA SHINOBU ,  OTSUBO YASUHIKO ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  NEGAMI AKIHIKO ,  ODA TOMIHISA ,  HARADA YASUO ,  ONO TOMOYUKI

IPC: F02D45/00 ,  F01N3/08 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N3/36

Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine capable of efficiently performing SOx poisoning recovery of a NOx reduction catalyst provided on an exhaust system of the internal combustion engine and normally and stably optimizing an exhaust characteristic. SOLUTION: An ECU 80 of an engine (internal combustion engine) 1 performs both of a fuel addition to an exhaust system 60 through a fuel addition nozzle 13 and a temperature rise of a NOx catalyst 41 when executing a SOx poisoning recovery control for promoting emission of SOx deposited on the NOx catalyst 41. During the execution of the SOx poisoning recovery control, timing when an air-fuel ratio (detected air-fuel ratio) detected on a downstream side of the catalyst 41 starts to rise from a lower limit value is recognized as emission starting timing of SOx. An emission ratio of SOx is estimated and calculated based on a deviation between the lower limit value of the air-fuel ratio and the detected air-fuel ratio during the emission period of SOx.

公开(公告)号：JP2002038942A

公开(公告)日：2002-02-06

申请号：JP2000223052

申请日：2000-07-24

Applicant: TOYOTA MOTOR CORP

Inventor： MATSUOKA HIROKI ,  MATSUSHITA SOICHI ,  TSUKASAKI YUKIHIRO ,  HAYASHI KOTARO ,  ISHIYAMA SHINOBU ,  OTSUBO YASUHIKO ,  MAGATA HISAFUMI ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  NEGAMI AKIHIKO ,  ODA TOMIHISA ,  HARADA YASUO ,  ONO TOMOYUKI

IPC: F01N3/36 ,  B01D53/94 ,  F01N3/08

Abstract: PROBLEM TO BE SOLVED: To always supply proper quantity of a reducing agent to a NOX catalyst, even if an operating state of an internal combustion engine is changed. SOLUTION: This device is provided with the NOX catalyst 17 provided on an exhaust passage of the internal combustion engine 1 capable of performing lean combustion to discharge and reduce absorbed NOX by the reducing agent, a reducing agent supply means 19 provided in the exhaust passage on an upstream side of the NOX catalyst 17, a load detection means for detecting load of the internal combustion engine 1, a particle size control means for controlling a particle size of the added reducing agent according to load of the internal combustion engine 1. The reducing agent controlled in particle size is added to the NOX catalyst 17 based on the load detected by the load detection means. When the internal combustion engine 1 has low load, adhesion of particle on a wall surface within the exhaust passage can be reduced by reducing the particle size since an exhaust temperature is low and flow speed of exhaust is slow.

公开(公告)号：JP2002021539A

公开(公告)日：2002-01-23

申请号：JP2000201660

申请日：2000-07-03

Applicant: TOYOTA MOTOR CORP

Inventor： HAYASHI KOTARO ,  MATSUSHITA SOICHI ,  TSUKASAKI YUKIHIRO ,  MATSUOKA HIROKI ,  ISHIYAMA SHINOBU ,  OTSUBO YASUHIKO ,  MAGATA HISAFUMI ,  KOBAYASHI MASAAKI ,  SHIBATA DAISUKE ,  NEGAMI AKIHIKO ,  ODA TOMIHISA ,  HARADA YASUO ,  ONO TOMOYUKI

IPC: F01N13/08 ,  F01N3/08 ,  F01N3/24 ,  F01N3/28 ,  F01N13/10 ,  F02D21/08 ,  F02M25/07 ,  F01N7/08 ,  F01N7/10

Abstract: PROBLEM TO BE SOLVED: To prevent a reducing agent supplied to a NOx absorber from entering an EGR system causing clogging of a gas passage in an EGR cooler and fluctuation of torque. SOLUTION: An engine 1 includes an exhaust manifold 14 interconnecting the exhaust ports of a series 4-cylinder engine 1; an engine exhaust passage having a NOx absorber 175 a connecting pipe 15 for connecting the exhaust manifold to a turbine 6b installed on the exhaust pipe 16; an EGR pipe 23 causing recirculation of part of exhaust gas to an engine intake system; and a nozzle 19 for adding gas oil to the NOx absorber 17. The connecting pipe 15 is connected to one end portion of the exhaust manifold 14 and the EGR pipe 23 is connected to the other end portion of the exhaust manifold 14. The nozzle 19 is installed at the exhaust port of the fourth cylinder #4 closest to the one end portion of the exhaust manifold 14 and a check valve 50 is provided between the fourth cylinder #4 and the third cylinder #3 of the exhaust manifold 14.

公开(公告)号：JP2001336416A

公开(公告)日：2001-12-07

申请号：JP2000153746

申请日：2000-05-24

Applicant: TOYOTA MOTOR CORP

Inventor： ISHIYAMA SHINOBU ,  TAWARA ATSUSHI ,  SHIBATA DAISUKE ,  MATSUSHITA SOICHI ,  TSUKASAKI YUKIHIRO ,  HAYASHI KOTARO ,  OBA TAKAHIRO ,  NEGAMI AKIHIKO

IPC: F01N3/20 ,  B01D53/94 ,  F01N3/08 ,  F01N3/28

Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device which can surely recover an ecclusion reduction type NOX catalyst from SOX poisoning, and also to suppress degradation of fuel consumption during recovering from the poisoning. SOLUTION: An NOX catalyst 17 is arranged in an intermediate portion of an exhaust pipe. A fuel-adding nozzle 21 for adding fuel into the exhaust gas during recovering from the SOX poisoning is arranged at a just upstream position of the NOX catalyst 17. An exhaust pipe 16 at the downstream portion of the NOX catalyst 17 is coupled to an EGR pipe 26 via a bypass pipe 29. A flow control valve 30 is arranged in the bypass pipe 29. During recovering from the SOX poisoning, the flow control valve is opened to introduce part of the exhaust gas flowing in the EGR pipe 26 to an exhaust confluent pipe 31 via the bypass pipe 29 by bypassing the fuel-adding nozzle 21 and the NOX catalyst 17. Thus, amount of exhaust gas passing the NOX catalyst 17 is reduced. The exhaust confluent pipe 31 is provided with an oxidation catalyst 19.

公开(公告)号：JP2001227325A

公开(公告)日：2001-08-24

申请号：JP2000035733

申请日：2000-02-14

Applicant: TOYOTA MOTOR CORP

Inventor： SHIBATA DAISUKE ,  MATSUSHITA SOICHI ,  ISHIYAMA SHINOBU ,  TAWARA ATSUSHI

IPC: F02D45/00 ,  F01N3/08 ,  F01N3/24 ,  F01N3/36 ,  F02D41/04

Abstract: PROBLEM TO BE SOLVED: To estimate catalyst floor temperature of a lean NOx catalyst. SOLUTION: A DPF 18 is provided in the middle of an exhaust pipe 14 of a diesel engine 1, and an occlusion reduction type NOx catalyst is borne on this DPF 18. An addition nozzle 21 is provided on the upstream of the DPF 18, and fuel as a reducer is supplied to the NOx catalyst borne by the DPF 18 from the addition nozzle 21. An ECU 9 estimates catalyst floor temperature of the NOx catalyst in consideration of a calorific value at the time when fuel added from the addition nozzle 21, and HC, CO in the exhaust gas react with the NOx catalyst.

公开(公告)号：JPH09264232A

公开(公告)日：1997-10-07

申请号：JP9938596

申请日：1996-03-27

Applicant: TOYOTA CENTRAL RES & DEV ,  TOYOTA MOTOR CORP ,  DENSO CORP ,  NIPPON SOKEN

Inventor： SAITO AKINORI ,  KINOSHITA MASAO ,  MATSUSHITA SOICHI ,  NIWA YUTAKA ,  SHIBATA HITOSHI

IPC: F02M51/06 ,  F02B75/12 ,  F02M53/04 ,  F02M61/18

Abstract: PROBLEM TO BE SOLVED: To suppress the cumulus of deposits by reducing the temperature of the injection port of a fuel injection valve lower than the specified distillation temperature of fuel, and make a deposit precursor flow out and from the injection port by ejection flow of fuel, and eliminating the deposit precursor, while holding the deposit precursor in fuel in a liquid phase condition. SOLUTION: In a deposit reducing type fuel injection valve 1, the temperature of the injection port 3 of a fuel injection valve 1 is reduced lower than a temperature which distillates from fuel for 90%, and a cooling water passage 5 is arranged on the top end part of the fuel injection valve 1 so as to cool the top end part of the fuel injection valve 1 positively. A deposit precursor included in fuel is dispersed and held in a liquid phase condition, it is prevented adhesion between the inner surface of the injection port 3 and the precursor from applying thereon so as to suppress the cumulus of deposits on the inner surface of the injection port 3, and also the precursor dispersed in fuel flows out from the injection port 3 together with in distillation fuel having fluid performance when fuel is injected.