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公开(公告)号：JP2001132436A
公开(公告)日：2001-05-15
申请号：JP31733899
申请日：1999-11-08
Applicant: TOYOTA MOTOR CORP
Inventor： TOSHIOKA TOSHISUKE , HIROTA SHINYA , ASANUMA TAKAMITSU , TANAKA TOSHIAKI
IPC: F01N3/08 , F01N3/20 , F01N3/22 , F01N3/24 , F02D9/04 , F02D41/02 , F02D41/04 , F02D41/30 , F02D41/34 , F02D43/00
Abstract: PROBLEM TO BE SOLVED: To restrict deterioration of emission of exhaust when it is cool by providing technology for efficiently conducting purification of unburnt fuel components and heating of exhaust in an exhaust heating device for heating exhaust while purifying unburnt fuel components included in exhaust. SOLUTION: This exhaust heating device for an internal combustion engine is provided with an exhaust restrictor valve to regulate flow of exhaust flowing through an exhaust passage, a valve control means for controlling the exhaust restrictor valve to be roughly totally closed for reducing unburnt fuel components included in exhaust, an engine air-fuel ratio control means for operating an internal combustion engine at a stoiciometrie air-fuel ratio or fuel rich air-fuel ratio when the exhaust restrictor valve is controlled to be roughly totally closed by the valve control means, and a secondary air supply means to supply secondary air to an upsteam part in the exhaust passage when the exhaust restrictor valve is controlled to be roughly totally closed by the valve control means.
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公开(公告)号：JP2001123825A
公开(公告)日：2001-05-08
申请号：JP30052899
申请日：1999-10-22
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
IPC: B01D53/94 , B01J23/46 , F01N3/20 , F01N3/24 , F01N3/36 , F01N9/00 , F01N13/08 , F02B27/06 , F02D41/06 , F02D43/00 , F02P23/02 , F01N7/08
Abstract: PROBLEM TO BE SOLVED: To inhibit worsening of exhaust emission at the start of an internal combustion engine by providing technology for stably burning combustible mixture supplied from the internal combustion engine at the upstream side of an exhaust emission catalyst. SOLUTION: This exhaust emission control device for an internal combustion engine comprises an igniting means, provided in an exhaust passage at the upstream side of an exhaust emission catalyst for igniting combustible mixture supplied from the internal combustion engine to heat the exhaust emission catalyst, where an exhaust throttle means is provided in the exhaust passage at the downstream side of the exhaust emission catalyst for throttling the flow rate of exhaust gas flowing in the exhaust passage during heating of the exhaust emission catalyst.
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公开(公告)号：JP2001050035A
公开(公告)日：2001-02-23
申请号：JP21993699
申请日：1999-08-03
Applicant: TOYOTA MOTOR CORP
Inventor： IWASAKI EIJI , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To increase a NOx purification ratio while reducing an amount of ammonia emitted to the atmosphere. SOLUTION: A NOx reduction catalyst 18 suitable for reducing NOx in exhaust gas by ammonia in oxygen-excessive condition is disposed in an exhaust passage of an internal combustion engine. An ammonia oxidation catalyst 21 suitable for oxidizing ammonia to nitrogen in oxygen-excessive condition is disposed in the exhaust passage downstream of the NOx reduction catalyst 18. Aqueous urea is supplied from supply means 24 in an exhaust passage 17 upstream of the NOx reduction catalyst 18. A supply quantity of the aqueous urea is controlled such that an equivalence ratio thereof with respect to a flow rate of the NOx flowing in the NOx reduction catalyst 18 is greater than 1.
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公开(公告)号：JP2001027113A
公开(公告)日：2001-01-30
申请号：JP20322999
申请日：1999-07-16
Applicant: TOYOTA MOTOR CORP
Inventor： IWASAKI EIJI , TANAKA TOSHIAKI , ITO KAZUHIRO
Abstract: PROBLEM TO BE SOLVED: To maintain optimally volume of reducing agent fed to a NOX catalyst. SOLUTION: This device has a NOX catalyst 11 capable of deoxidizing NOX in an oxidizing atmosphere containing a reducing agent, and having a reducing agent storage capacity arranged inside an engine exhaust passage. Reducing agent storing volume that indicates volume of reducing agent stored in the NOX catalyst 11 is obtained to obtain reducing agent feeding volume that is volume of reducing agent required to be fed to the NOX catalyst 11 on the basis of the reducing agent storing volume. A reducing agent is fed from a reducing agent feeding device 13 to the NOX catalyst 11 by the reducing agent feeding volume to deoxidixe NOX. A difference of the reducing agent storing volume comparing to the volume of reducing agent actually stored in the NOX catalyst 11 is judged if it is larger than an acceptable value or not. When the difference is judged to be larger than the acceptable value, NOX catalyst 11 is heated by a catalyst heating device 17 to have the whole reducing agent stored in the NOX catalyst 11 released from the NOX catalyst 11, and the reducing agent storing volume is returned to be zero.
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公开(公告)号：JP2001003799A
公开(公告)日：2001-01-09
申请号：JP17259899
申请日：1999-06-18
Applicant: TOYOTA MOTOR CORP
Inventor： ASANUMA TAKAMITSU , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To remarkably reduce unburnt HC discharge in the atmosphere during starting and warming up of an engine. SOLUTION: In this internal combustion engine, an exhaust control valve 24 is arranged in an exhaust pipe 22. During starting and warming up of an engine, the exhaust control valve 24 is approximately fully closed and in addition to main fuel, auxiliary fuel is additionally injected during an expansion stroke. An exhaust gas temperature at an exhaust port outlet is detected by a temperature sensor 32, and the opening of the exhaust control valve 24 is controlled so that the exhaust gas temperature is adjusted to a target value.
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Patent Agency Ranking
公开(公告)号：JP2000230419A
公开(公告)日：2000-08-22
申请号：JP3068899
申请日：1999-02-08
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To execute a reviving process for the SOx absorbing agent at an appropriate time in an exhaust emission control device comprising an SOx absorbing agent upstream of an NOx catalyst. SOLUTION: An SOx sensor 24 and an NOx catalyst 20 are provided downstream of an SOx absorbing agent 17. At the time of rich spike immediately after reviving the SOx absorbing agent 17, the SOx concentration in the exhaust gas downstream of the SOx absorbing agent 17 is detected by the SOx sensor 24. Based on the size of the SOx concentration, the state (degree) of the thermal deterioration of the SOx absorbing agent 17 is judged so that frequency of reviving the SOx absorbing agent 17 is increased according to the progress of the thermal deterioration.
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公开(公告)号：JP2000220437A
公开(公告)日：2000-08-08
申请号：JP2480399
申请日：1999-02-02
Applicant: TOYOTA MOTOR CORP
Inventor： IWASAKI EIJI , TANAKA TOSHIAKI
IPC: B01D53/94 , B01J21/06 , B01J23/40 , B01J23/64 , B01J23/70 , B01J29/06 , F01N3/08 , F01N3/20 , F01N3/28 , F01N13/02
Abstract: PROBLEM TO BE SOLVED: To supply an NOX reducing agent with a simple structure. SOLUTION: A solid urea lump 24 is placed in a bypass tube 22 returning to an exhaust pipe 18 diverged from the exhaust pipe 18 in an upper stream of exhaust catalyst 19. And a bypass control valve 26 is arranged at the entrance part 22a of the bypass tube 22. A generated material including a reducing agent generated from the solid urea lump 24 when the solid urea lump 24 is heated by exhaust gas circulating in the bypass tube 22 is separated from the solid urea lump 24 and supplied to exhaust emission catalyst 19. The opening of a bypass control valve 26 is controlled in accordance with NOX amount discharged from an engine to control the amount of generated material supplied to the exhaust emission catalyst 19.
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公开(公告)号：JP2000186537A
公开(公告)日：2000-07-04
申请号：JP36576898
申请日：1998-12-22
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To improve performance of purifying a harmful gas ingredient by determining the state of an exhaust emission control means, and changing the combustion condition of a combustion device to make the properties of combustion gas discharged from the combustion device according to the condition of the exhaust emission control means. SOLUTION: An internal combustion engine 1 is provided with a combustion heater 14, and intake air taken through an intake air introducing passage 15 from an intake passage 3 and evaporated fuel obtained by evaporating fuel taken through a fuel introducing passage 20 by a glow plug are mixed and ignited to be burnt. The generated combustion gas is introduced through a combustion gas exhaust passage 17 into an exhaust pipe 7 on the upstream of an occlusion reducing type lean NOx catalyst 8 and mixed with exhaust gas flowing from the upstream of the exhaust pipe 7 to flow into the NOx catalyst 8 to purify the exhaust gas. At this time, according to the purifying time of granular material such as NOx, SOx and soot in the NOx catalyst 8, the combustion condition of the combustion chamber heater 14 is changed to vary the properties of mixed gas flowing into the NOx catalyst 8.
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公开(公告)号：JP2000186531A
公开(公告)日：2000-07-04
申请号：JP36576598
申请日：1998-12-22
Applicant: TOYOTA MOTOR CORP
Inventor： SUZUKI MAKOTO , HAYASHI KOTARO , KOBAYASHI HIDEO , HIROTA SHINYA , TANAKA TOSHIAKI
IPC: F02M25/07 , F01N3/08 , F01N3/20 , F01N3/24 , F01N3/28 , F01N3/36 , F01N13/04 , F02B33/44 , F02B37/00 , F02D21/08 , F02D41/14
Abstract: PROBLEM TO BE SOLVED: To enough supply a reducing agent such as hydrocarbon or the like to a lean NOx catalyst by providing a combustion heater for raising the temperature of an engine related element, and providing an introduction path for introducing combustion gas emitted by the combustion heater toward the upstream of a catalyst in an exhaust path when the regenerating process for the lean NOx catalyst is required. SOLUTION: An inlet pipe 23 of a Diesel engine l is largely divided with a boundary of a compressor 15a into a downstream connecting pipe 27 pressurized by forced push-in of intake air. and an upstream connecting pipe 25. The downstream connecting pipe 27 is formed by an L-shaped main stream pipe 29 connecting a compressor 15a and an intake manifold 21 and a heater branch pipe 31 as a branch pipe connected to the main stream pipe 29 like a bypass, and a combustion heater 17 is interposed in the branch pipe 31. A three-way valve 97 is interposed in an exhaust passage 35 connecting the downstream end of the combustion heater 17 connected to a car compartment heater 9 to the main stream pipe 29, thereby supplying combustion gas of the combustion heater 17 as a reducing agent to a catalytic converter 39 through an introduction path 99.
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公开(公告)号：JP2000161045A
公开(公告)日：2000-06-13
申请号：JP33461298
申请日：1998-11-25
Applicant: TOYOTA MOTOR CORP
Inventor： HIROTA SHINYA , TANAKA TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To prevent discharging of SOx absorbed by occulusion reduction type NOx catalyst when a car is stopped or driven with extremely low speed. SOLUTION: After SOx is absorbed by an NOx catalyst 17 by a specific amount, an ECU 30 determines a discharging timing of SOx. The ECU 30 performs stoichi controlling of an air-fuel ratio of the exhaust gas for discharging SOx from the NOx catalyst 17 while keeping temperature of the exhaust gas at a specified value or higher. That is, it performs high temperature stoichi controlling for discharging SOx. However, when the running speed of a car sensed by a vehicular speed sensor 27 is not higher than a lower limit value, that is, the car is stopped or driven with extremely low speed, the high temperature stoichi controlling is suspended. Low temperature stoichi controlling where the exhaust air-fuel ratio is kept in stoichi state and the exhaust gas temperature is kept lower than SOx discharge reduction temperature is executed, so that SOx discharging from the NOx catalyst is suspended to thereby discontinue a SOx discharging treatment.
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