JP2014037787A5 - - Google Patents
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- JP2014037787A5 JP2014037787A5 JP2012179375A JP2012179375A JP2014037787A5 JP 2014037787 A5 JP2014037787 A5 JP 2014037787A5 JP 2012179375 A JP2012179375 A JP 2012179375A JP 2012179375 A JP2012179375 A JP 2012179375A JP 2014037787 A5 JP2014037787 A5 JP 2014037787A5
- Authority
- JP
- Japan
- Prior art keywords
- urea water
- injection control
- catalytic converter
- amount
- water injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
より具体的には、尿素水噴射制御部７４は、排気のＮＨ３濃度に対して０よりもやや大きな値に目標値を設定し、ＮＨ３濃度算出部７２によって算出されるＮＨ３濃度が、上記目標値に一致した状態が維持されるように尿素水の噴射量を制御する。換言すると、尿素水噴射制御部７４は、下流触媒コンバータ３３から、ごく僅かな量のＮＨ３がスリップした状態が維持されるように尿素水の噴射量を制御する。下流触媒コンバータ３３のＳＣＲ触媒は、その温度に応じて変化する最大ＮＨ３ストレージ容量だけＮＨ３を貯蔵する能力があり、また貯蔵するＮＨ３の量が多い程ＮＯｘの還元性能が高くなる。したがって、尿素水噴射制御部７４によって、僅かな量のＮＨ３がスリップした状態が維持されるように尿素水噴射制御を行うことにより、ＮＨ３のスリップ量を最小限に留めつつ、下流触媒コンバータ３３のＮＯｘ浄化性能を高く維持できる。なお、下流触媒コンバータ３３からスリップするＮＨ３は、ＮＨ３センサ５のさらに下流側にＳＣＲ触媒や酸化触媒等を設けておき、これら触媒で適宜処理することによって、システム外にＮＨ３が排出するのを防止できる。また、ＮＨ３センサの検出信号から算出されたＮＨ３濃度に基づいて、このような尿素水噴射制御を実現するための具体的なアルゴリズムについては、例えば本願出願人による国際公開第２００９／１２８１６９に記載されているので、ここでは詳細な説明を省略する。
More specifically, the urea solution injection control unit 74, than 0 for NH 3 concentration of the exhaust sets a target value slightly greater, the NH 3 concentration calculated by the NH 3 concentration calculator 72, The injection amount of urea water is controlled so that the state matching the target value is maintained. In other words, the urea water injection control unit 74 controls the injection amount of urea water so that a very small amount of NH 3 slips from the downstream catalytic converter 33. The SCR catalyst of the downstream catalytic converter 33 has the ability to store NH 3 by the maximum NH 3 storage capacity that changes according to the temperature, and the NO 3 reduction performance increases as the amount of NH 3 stored increases. Therefore, the urea water injection control unit 74 performs urea water injection control so as to maintain a state in which a small amount of NH 3 slips, thereby minimizing the slip amount of NH 3 and reducing the downstream catalytic converter. 33 NOx purification performance can be maintained high. The NH 3 slipping from the downstream catalytic converter 33 is provided with an SCR catalyst, an oxidation catalyst, or the like further downstream of the NH 3 sensor 5 and appropriately treated with these catalysts, whereby NH 3 is discharged outside the system. Can be prevented. Further, a specific algorithm for realizing such urea water injection control based on the NH 3 concentration calculated from the detection signal of the NH 3 sensor is, for example, International Publication No. 2009/128169 by the present applicant. Therefore, detailed description thereof is omitted here.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012179375A JP5812952B2 (en) | 2012-08-13 | 2012-08-13 | Exhaust gas purification system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012179375A JP5812952B2 (en) | 2012-08-13 | 2012-08-13 | Exhaust gas purification system for internal combustion engine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2014037787A JP2014037787A (en) | 2014-02-27 |
| JP2014037787A5 true JP2014037787A5 (en) | 2014-04-10 |
| JP5812952B2 JP5812952B2 (en) | 2015-11-17 |
Family
ID=50286099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012179375A Expired - Fee Related JP5812952B2 (en) | 2012-08-13 | 2012-08-13 | Exhaust gas purification system for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5812952B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6102908B2 (en) * | 2014-12-26 | 2017-03-29 | トヨタ自動車株式会社 | Exhaust purification device deterioration diagnosis device |
| JP6102907B2 (en) * | 2014-12-26 | 2017-03-29 | トヨタ自動車株式会社 | Exhaust purification device deterioration diagnosis device |
| JP2016166757A (en) * | 2015-03-09 | 2016-09-15 | 本田技研工業株式会社 | Failure detection method of nh3 sensor |
| JP2016166546A (en) * | 2015-03-09 | 2016-09-15 | 本田技研工業株式会社 | Device for detecting failure of nh3 sensor |
| JP2017067041A (en) * | 2015-10-01 | 2017-04-06 | 本田技研工業株式会社 | Exhaust emission control system for internal combustion engine |
| JP6483004B2 (en) * | 2015-10-19 | 2019-03-13 | 本田技研工業株式会社 | Humidity estimation method and exhaust purification system for internal combustion engine |
| JP6278039B2 (en) * | 2015-12-14 | 2018-02-14 | トヨタ自動車株式会社 | Degradation diagnosis device for selective catalytic reduction catalyst |
| JP6867921B2 (en) * | 2016-10-24 | 2021-05-12 | 日本碍子株式会社 | Ammonia concentration measuring device, ammonia concentration measuring system, exhaust gas treatment system, and ammonia concentration measuring method |
| DE102017202574A1 (en) * | 2017-02-17 | 2018-08-23 | Ford Global Technologies, Llc | Method for operating an exhaust gas aftertreatment device of a motor vehicle |
| CN114000937B (en) * | 2021-10-29 | 2023-03-24 | 潍柴动力股份有限公司 | Automatic recognition cleaning device for urea crystallization and control method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4211232B2 (en) * | 2001-04-19 | 2009-01-21 | トヨタ自動車株式会社 | Exhaust gas sensor |
| JP5033017B2 (en) * | 2008-02-22 | 2012-09-26 | 日本特殊陶業株式会社 | Ammonia gas sensor |
| JP2010139238A (en) * | 2008-12-09 | 2010-06-24 | Ngk Spark Plug Co Ltd | Ammonia gas sensor |
-
2012
- 2012-08-13 JP JP2012179375A patent/JP5812952B2/en not_active Expired - Fee Related
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