JPH0673317U - Exhaust gas purification device for diesel engine - Google Patents
Exhaust gas purification device for diesel engineInfo
- Publication number
- JPH0673317U JPH0673317U JP1411193U JP1411193U JPH0673317U JP H0673317 U JPH0673317 U JP H0673317U JP 1411193 U JP1411193 U JP 1411193U JP 1411193 U JP1411193 U JP 1411193U JP H0673317 U JPH0673317 U JP H0673317U
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- addition
- reduction catalyst
- addition amount
- engine
- 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.)
- Granted
Links
- 238000000746 purification Methods 0.000 title 1
- 239000003054 catalyst Substances 0.000 claims abstract description 46
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 46
- 230000009467 reduction Effects 0.000 claims abstract description 33
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
(57)【要約】
【目的】 ディーゼルエンジンの排気浄化装置におい
て、還元触媒のウォームアップ中に還元剤が未反応のま
ま排出されるのを抑制する。
【構成】 ディーゼルエンジン１の排気通路２の途中に
介装される還元触媒３と、還元触媒３の上流側に還元剤
を添加する添加装置５と、還元触媒３の入口温度Ｔを検
出するセンサ７と、検出温度Ｔから還元剤の添加開始時
を判定する手段１１と、エンジン回転数とエンジン負荷
を検出する手段１２と、エンジン回転数とエンジン負荷
の検出値から還元剤の添加量Ｍを算出する手段１３と、
還元剤の添加開始時からの経過時間ｔに応じて定めた所
定の添加量Ｍへと漸進的に還元剤の添加量を増大させる
還元剤添加制御手段１４とを備える。
(57) [Summary] [Purpose] In an exhaust emission control device for a diesel engine, it is possible to prevent the reducing agent from being discharged unreacted during warm-up of the reduction catalyst. [Structure] A reduction catalyst 3 installed in the middle of an exhaust passage 2 of a diesel engine 1, an addition device 5 for adding a reducing agent to the upstream side of the reduction catalyst 3, and a sensor for detecting an inlet temperature T of the reduction catalyst 3. 7, a means 11 for determining the start time of addition of the reducing agent from the detected temperature T, a means 12 for detecting the engine speed and the engine load, and an addition amount M of the reducing agent from the detected values of the engine speed and the engine load. Calculating means 13,
And a reducing agent addition control means 14 for gradually increasing the reducing agent addition amount to a predetermined addition amount M determined according to the elapsed time t from the start of addition of the reducing agent.
Description
【０００１】[0001]
本考案は、ディーゼルエンジンの排気浄化装置の改良に関するものである。 The present invention relates to an improvement in an exhaust emission control device for a diesel engine.
【０００２】[0002]
ディーゼルエンジンから排出される窒素酸化物を浄化する装置として、例えば 特開平２−１４９３１７号公報、特開昭６３−１００９１９号公報にも見られる ように、排気通路の途中に還元触媒が介装され、還元触媒の上流側に還元剤を添 加するものがある。 As a device for purifying nitrogen oxides discharged from a diesel engine, a reduction catalyst is provided in the middle of an exhaust passage as seen in, for example, JP-A-2-149317 and JP-A-63-110919. In some cases, a reducing agent is added on the upstream side of the reduction catalyst.
【０００３】 このような排気浄化装置として、従来例えば図４に示すように、ディーゼルエ ンジン１の排気通路２の途中に還元触媒３が介装され、燃料タンク４に貯溜され る軽油の一部を還元剤として排気通路２の還元触媒３の上流側に添加する添加装 置５を備えるものがある。還元触媒３は、酸化雰囲気中あるいは炭化水素の存在 下で、窒素酸化物を含有する排ガスを接触させることにより、排ガス中の窒素酸 化物を窒素と酸素に分解するようになっている(特開平１−１１８０９号公報、 参照)。As such an exhaust emission control device, as shown in FIG. 4, for example, a reduction catalyst 3 is interposed in the middle of an exhaust passage 2 of a diesel engine 1 and a part of light oil stored in a fuel tank 4 is stored. In some cases, an addition device 5 is added as a reducing agent on the upstream side of the reduction catalyst 3 in the exhaust passage 2. The reduction catalyst 3 is adapted to decompose the nitrogen oxides in the exhaust gas into nitrogen and oxygen by contacting the exhaust gas containing nitrogen oxides in an oxidizing atmosphere or in the presence of hydrocarbons (Japanese Patent Laid-Open No. Hei 10-1999) No. 1-118009).
【０００４】[0004]
しかしながら、このような従来のディーゼルエンジンの排気浄化装置にあって は、触媒が活性化する温度まで上昇するウォームアップ中に還元剤が投入される と、図５に示すように、還元剤が未反応のまま排出されるという問題点がある。 However, in such a conventional diesel engine exhaust emission control device, if the reducing agent is injected during the warm-up that rises to the temperature at which the catalyst is activated, as shown in FIG. There is a problem that the reaction is discharged as it is.
【０００５】 本考案は上記の問題点に着目し、還元触媒のウォームアップ中に還元剤が未反 応のまま排出されるのを抑制することを目的とする。The present invention focuses on the above-mentioned problems, and an object thereof is to prevent the reducing agent from being discharged unreacted during the warm-up of the reduction catalyst.
【０００６】[0006]
本考案は、図１に示すように、ディーゼルエンジン１の排気通路２の途中に介 装される還元触媒３と、還元触媒３の上流側に還元剤を添加する添加装置５と、 還元触媒３の入口温度Ｔを検出するセンサ７と、検出温度Ｔから還元剤の添加開 始時を判定する手段１１と、エンジン回転数とエンジン負荷を検出する手段１２ と、エンジン回転数とエンジン負荷の検出値から還元剤の添加量Ｍを算出する手 段１３と、還元剤の添加開始時からの経過時間ｔに応じて定めた所定の添加量Ｍ へと漸進的に還元剤の添加量を増大させる還元剤添加制御手段１４とを備える。 As shown in FIG. 1, the present invention is directed to a reduction catalyst 3 installed in the exhaust passage 2 of a diesel engine 1, an addition device 5 for adding a reducing agent to the upstream side of the reduction catalyst 3, and a reduction catalyst 3 Sensor 7 for detecting the inlet temperature T of the engine, means 11 for determining the start time of addition of the reducing agent from the detected temperature T, means 12 for detecting the engine speed and engine load, and detection of the engine speed and engine load A step 13 for calculating the addition amount M of the reducing agent from the value, and gradually increasing the addition amount of the reducing agent to a predetermined addition amount M determined according to the elapsed time t from the start of the addition of the reducing agent. And a reducing agent addition control means 14.
【０００７】[0007]
請求項１記載の考案においては、還元触媒３の入口温度Ｔが所定の触媒活性が 得られる所定温度Ｔ1を越えて上昇してから、経過時間に応じて定めた所定の添 加量Ｍへと漸進的に還元剤の添加量を増大させて添加することにより、触媒が活 性化する度合いに応じて還元剤が添加されることになり、還元剤が未反応のまま 排気通路２を通って外部に排出されることを抑制できる。In the invention according to claim 1, after the inlet temperature T of the reducing catalyst 3 rises above a predetermined temperature T 1 at which a predetermined catalyst activity is obtained, a predetermined addition amount M determined according to the elapsed time is reached. By gradually increasing the addition amount of the reducing agent, the reducing agent is added according to the degree of activation of the catalyst, and the reducing agent passes through the exhaust passage 2 without being reacted. Can be suppressed from being discharged to the outside.
【０００８】[0008]
以下、本考案の実施例を添付図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
【０００９】 図１に示すように、ディーゼルエンジン１の排気通路２の途中に還元触媒３が 介装される。還元触媒３は例えばアルミナ、シリカ、ゼオライト等の基材と銅等 の金属からなる触媒物質をハニカム状の担体に担持した構造を有し、酸化雰囲気 中あるいは炭化水素の存在下で、窒素酸化物（ＮＯｘ）を含有する排ガスを接触 させることにより、排ガス中の窒素酸化物を窒素と酸素に分解するようになって いる。As shown in FIG. 1, a reduction catalyst 3 is interposed in the exhaust passage 2 of a diesel engine 1. The reduction catalyst 3 has, for example, a structure in which a base material such as alumina, silica, zeolite or the like and a catalyst substance made of a metal such as copper are supported on a honeycomb-shaped carrier, and the nitrogen oxide is used in an oxidizing atmosphere or in the presence of hydrocarbon. By contacting exhaust gas containing (NOx), nitrogen oxides in the exhaust gas are decomposed into nitrogen and oxygen.
【００１０】 還元触媒３の上流側に還元剤を添加する手段として、燃料タンク４に貯溜され る軽油の一部を排気通路２の還元触媒３の上流側に添加する添加装置５が設けら れる。As a means for adding the reducing agent to the upstream side of the reduction catalyst 3, an addition device 5 for adding a part of the light oil stored in the fuel tank 4 to the upstream side of the reduction catalyst 3 in the exhaust passage 2 is provided. .
【００１１】 還元触媒３の温度を検出する手段として、還元触媒３の直上流側に排ガス温度 を検出する温度センサ７が配設される。なお、還元触媒３の温度を検出する手段 として、還元触媒３の温度を直接検出するセンサを設けてもよい。As a means for detecting the temperature of the reduction catalyst 3, a temperature sensor 7 for detecting the exhaust gas temperature is arranged immediately upstream of the reduction catalyst 3. As a means for detecting the temperature of the reduction catalyst 3, a sensor that directly detects the temperature of the reduction catalyst 3 may be provided.
【００１２】 図中６は添加装置５からの還元剤の添加量を制御する制御装置である。制御装 置６は、エンジン回転数とエンジン負荷の検出手段１２からの検出信号に基づい て還元剤の添加量Ｍを算出するとともに、還元触媒３の入口温度Ｔが触媒の活性 化が始まる所定値Ｔ1以上になってからの経過時間ｔに応じて定めた所定の添加 量Ｍへと漸進的に還元剤の添加量を増大させるように添加装置５に指令する。In the figure, 6 is a control device for controlling the addition amount of the reducing agent from the addition device 5. The control device 6 calculates the addition amount M of the reducing agent on the basis of the engine speed and the detection signal from the engine load detection means 12, and the inlet temperature T of the reduction catalyst 3 is a predetermined value at which the activation of the catalyst starts. The addition device 5 is instructed to gradually increase the addition amount of the reducing agent to the predetermined addition amount M determined according to the elapsed time t after the time T 1 or more.
【００１３】 図２のフローチャートは制御装置６において実行される還元剤の添加を行う制 御プログラムを示しており、これは一定時間毎に行われる。The flowchart of FIG. 2 shows a control program executed by the control device 6 for adding a reducing agent, which is executed at regular time intervals.
【００１４】 これについて説明すると、まずステップ１でエンジン回転数Ｎとエンジン負荷 Ｑを読込み、ステップ２で所定のマップに基づいてこれら運転状態に応じた還元 剤の添加量Ｍを検索する。Explaining this, first, in step 1, the engine speed N and engine load Q are read, and in step 2, the reducing agent addition amount M according to these operating states is searched based on a predetermined map.
【００１５】 続いてステップ３で温度センサ７の検出温度Ｔを読込み、ステップ４で触媒入 口温度Ｔが所定値Ｔ1以上かどうかを判定する。触媒入口温度Ｔが所定値Ｔ1より 低い場合にステップ１３に進んで還元剤の添加を停止する。Subsequently, in step 3, the temperature T detected by the temperature sensor 7 is read, and in step 4, it is determined whether the catalyst inlet temperature T is equal to or higher than a predetermined value T 1 . When the catalyst inlet temperature T is lower than the predetermined value T 1 , the process proceeds to step 13 and the addition of the reducing agent is stopped.
【００１６】 触媒入口温度Ｔが所定値Ｔ1以上の場合に、ステップ５に進んで触媒入口温度 Ｔが所定値Ｔ1を越えてからの経過時間ｔを計測する。When the catalyst inlet temperature T is equal to or higher than the predetermined value T 1 , the process proceeds to step 5 and the elapsed time t after the catalyst inlet temperature T exceeds the predetermined value T 1 is measured.
【００１７】 ステップ６で経過時間ｔが所定時間ｔ1より短いと判定された場合、ステップ ７に進んで添加量をＭ×α1（α1＜１）として算出する。When it is determined in step 6 that the elapsed time t is shorter than the predetermined time t 1 , the process proceeds to step 7 and the addition amount is calculated as M × α 1 (α 1 <1).
【００１８】 ステップ８で経過時間ｔが所定時間ｔ1以上で所定時間ｔ2より短いと判定され た場合、ステップ９に進んで添加量をＭ×α2（１＞α2＞α1）として算出する 。When it is determined in step 8 that the elapsed time t is equal to or longer than the predetermined time t 1 and shorter than the predetermined time t 2 , the process proceeds to step 9 and the addition amount is set to M × α 2 (1> α 2 > α 1 ). calculate .
【００１９】 同様にステップ１０，１１，１２と進んで経過時間ｔが増加するのにしたがっ て所定の添加量Ｍへと漸進的に還元剤の添加量を増大させる。Similarly, the process proceeds to Steps 10, 11, and 12, and as the elapsed time t increases, the reducing agent addition amount is gradually increased to the predetermined addition amount M.
【００２０】 次に、作用について説明する。Next, the operation will be described.
【００２１】 図３に示すように、還元触媒３の入口温度Ｔが所定の触媒活性が得られる所定 値Ｔ1を越えて上昇してから時間ｔが経過するのに伴って触媒の活性化が進む。As shown in FIG. 3, as the inlet temperature T of the reduction catalyst 3 rises above a predetermined value T 1 at which a predetermined catalyst activity is obtained, the activation of the catalyst becomes move on.
【００２２】 したがって、還元触媒３の入口温度Ｔが所定温度Ｔ1を越えて上昇してから、 経過時間に応じて添加量を段階的に増大させることにより、触媒が活性化状態に 応じて還元剤が添加されることになり、窒素酸化物の還元効率を速やかに高めら れるとともに、トータルハイドロカーボン（ＴＨＣ）の排出量を速やかに減らし て、還元剤が未反応のまま排気通路２を通って外部に排出されることを抑制でき る。Therefore, after the inlet temperature T of the reduction catalyst 3 rises above the predetermined temperature T 1 , the addition amount is increased stepwise according to the elapsed time, whereby the catalyst is reduced according to the activated state. Since the reducing agent is added, the reduction efficiency of nitrogen oxides can be rapidly increased, and the total hydrocarbon (THC) emission amount can be rapidly reduced so that the reducing agent passes through the exhaust passage 2 without being reacted. It is possible to suppress the discharge to the outside.
【００２３】 なお、還元触媒の検出温度が所定値を越えて上昇する運転条件を判定する手段 として、温度センサ７の検出温度Ｔが所定値Ｔ1以上かどうかを判定する代わり に、エンジン回転数Ｎとエンジン負荷Ｑの検出値に基づいて還元剤の添加開始時 を判定してもよい。As a means for determining the operating condition in which the detected temperature of the reduction catalyst rises above a predetermined value, instead of determining whether the detected temperature T of the temperature sensor 7 is a predetermined value T 1 or more, the engine speed The start time of adding the reducing agent may be determined based on the detected values of N and the engine load Q.
【００２４】[0024]
以上説明したようにこの考案は、ディーゼルエンジンの排気通路の途中に介装 される還元触媒と、還元触媒の上流側に還元剤を添加する手段と、還元触媒の温 度を検出する手段と、検出温度から還元剤の添加開始時を判定する手段と、エン ジン回転数とエンジン負荷を検出する手段と、エンジン回転数とエンジン負荷の 検出値から還元剤の添加量を算出する手段と、還元剤の添加開始時からの経過時 間に応じて定めた所定の添加量へと漸進的に還元剤の添加量を増大させる還元剤 添加制御手段とを備えたため、触媒が活性化した度合いに応じて還元剤が添加さ れることにより、触媒のウォームアップに時間を要することや応答遅れに原因し て還元剤が未反応のまま排出されることを抑制できる。 As described above, the present invention has a reduction catalyst installed in the exhaust passage of a diesel engine, a means for adding a reducing agent to the upstream side of the reduction catalyst, and a means for detecting the temperature of the reduction catalyst. A means for determining the start of addition of the reducing agent from the detected temperature, a means for detecting the engine rotation speed and the engine load, a means for calculating the addition amount of the reducing agent from the detected values of the engine rotation speed and the engine load, and reducing Since a reducing agent addition control means that gradually increases the reducing agent addition amount to a predetermined addition amount determined according to the elapsed time from the start of the addition of the agent is provided, By adding the reducing agent as described above, it is possible to prevent the reducing agent from being discharged unreacted because it takes time to warm up the catalyst and the response is delayed.
【図１】本考案の一実施例を示す構成図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】同じく制御内容を示すフローチャート。FIG. 2 is a flowchart showing the same control contents.
【図３】同じく作用を示す線図。FIG. 3 is a diagram showing the same operation.
【図４】従来例を示す構成図。FIG. 4 is a configuration diagram showing a conventional example.
【図５】同じく作用を示す線図。FIG. 5 is a diagram showing the same operation.
１ ディーゼルエンジン ２ 排気通路 ３ 還元触媒 ５ 添加装置（添加手段） ６ 制御装置 １１ 添加開始時判定手段 １２ エンジン回転数と負荷の検出手段 １３ 還元剤の添加量算出手段 １４ 還元剤添加制御手段 DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Exhaust passage 3 Reduction catalyst 5 Addition device (addition means) 6 Control device 11 Addition start time determination means 12 Engine speed and load detection means 13 Reducing agent addition amount calculation means 14 Reducing agent addition control means
Claims (1)
と、還元触媒の上流側に還元剤を添加する手段と、還元
触媒の温度を検出する手段と、検出温度から還元剤の添
加開始時を判定する手段と、エンジン回転数とエンジン
負荷を検出する手段と、エンジン回転数とエンジン負荷
の検出値から還元剤の添加量を算出する手段と、還元剤
の添加開始時からの経過時間に応じて定めた所定の添加
量へと漸進的に還元剤の添加量を増大させる還元剤添加
制御手段とを備えたことを特徴とするディーゼルエンジ
ンの排気浄化装置。1. A reduction catalyst interposed in the middle of an exhaust passage, a means for adding a reducing agent to the upstream side of the reduction catalyst, a means for detecting the temperature of the reduction catalyst, and the addition of the reducing agent from the detected temperature. Means for determining the time, means for detecting the engine speed and engine load, means for calculating the addition amount of the reducing agent from the detected values of the engine speed and the engine load, and the elapsed time from the start of the addition of the reducing agent An exhaust emission control device for a diesel engine, comprising: a reducing agent addition control means for gradually increasing the reducing agent addition amount to a predetermined addition amount determined according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993014111U JP2589592Y2 (en) | 1993-03-25 | 1993-03-25 | Diesel engine exhaust purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993014111U JP2589592Y2 (en) | 1993-03-25 | 1993-03-25 | Diesel engine exhaust purification system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0673317U true JPH0673317U (en) | 1994-10-18 |
| JP2589592Y2 JP2589592Y2 (en) | 1999-01-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993014111U Expired - Lifetime JP2589592Y2 (en) | 1993-03-25 | 1993-03-25 | Diesel engine exhaust purification system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2589592Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002008583A1 (en) * | 2000-07-24 | 2002-01-31 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| JP2004116461A (en) * | 2002-09-27 | 2004-04-15 | Hino Motors Ltd | Method of removing sulfate of particulate filter |
-
1993
- 1993-03-25 JP JP1993014111U patent/JP2589592Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002008583A1 (en) * | 2000-07-24 | 2002-01-31 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| JP2004116461A (en) * | 2002-09-27 | 2004-04-15 | Hino Motors Ltd | Method of removing sulfate of particulate filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2589592Y2 (en) | 1999-01-27 |
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