JP2589592Y2 - Diesel engine exhaust purification system - Google Patents
Diesel engine exhaust purification systemInfo
- Publication number
- JP2589592Y2 JP2589592Y2 JP1993014111U JP1411193U JP2589592Y2 JP 2589592 Y2 JP2589592 Y2 JP 2589592Y2 JP 1993014111 U JP1993014111 U JP 1993014111U JP 1411193 U JP1411193 U JP 1411193U JP 2589592 Y2 JP2589592 Y2 JP 2589592Y2
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- reduction catalyst
- temperature
- amount
- catalyst
- 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.)
- Expired - Lifetime
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Description
【考案の詳細な説明】[Detailed description of the invention]
【０００１】[0001]
【産業上の利用分野】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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an exhaust gas purification device for a diesel engine.
【０００２】[0002]
【従来の技術】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２−１４９
３１７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。2. Description of the Related Art An apparatus for purifying nitrogen oxides discharged from a diesel engine is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-149.
No. 317 and JP-A-63-100919, a reduction catalyst is provided in the middle of the exhaust passage.
In some cases, a reducing agent is added upstream 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)。Conventionally, as shown in FIG. 4, for example, as shown in FIG. 4, a reduction catalyst 3 is interposed in an exhaust passage 2 of a diesel engine 1 and a part of light oil stored in a fuel tank 4 is removed. Some include an addition device 5 that adds a reducing agent upstream of the reduction catalyst 3 in the exhaust passage 2.
The reduction catalyst 3 is designed to decompose nitrogen oxides in the exhaust gas into nitrogen and oxygen by contacting the exhaust gas containing the nitrogen oxides in an oxidizing atmosphere or in the presence of a hydrocarbon (Japanese Unexamined Patent Publication (Kokai) No. Heisei 9 (1994) -207). 1-11-1809 reference).
【０００４】[0004]
【考案が解決しようとする課題】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 exhaust gas purifying apparatus for a diesel engine, when a reducing agent is supplied during a warm-up period in which the temperature rises to a temperature at which the catalyst is activated, FIG. As described above, there is a problem that the reducing agent is discharged without reacting.
【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 has as its object to suppress the discharge of the reducing agent without being reacted during the warm-up of the reduction catalyst.
【０００６】[0006]
【課題を解決するための手段】本考案は、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、
この検出温度から還元触媒の温度が所定値以上になると
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、その算出量に１以下の定数αを掛けて還元剤の添加
量を決定する手段と、この決定量に還元剤の添加量を制
御する手段と、還元触媒の温度が所定値以上のときに還
元剤の添加開始時点からの経過時間に応じて定数αを初
期値から１に漸増させる手段と、を備える。According to the present invention, there is provided a reduction catalyst provided in the middle of an exhaust passage, a means for adding a reducing agent upstream of the reduction catalyst, a means for detecting a temperature of the reduction catalyst,
Means for determining at the start of addition of the detection from the temperature and the temperature of the reduction catalyst becomes equal to or higher than a predetermined value <br/> reducing agent, a means for detecting the engine speed and the engine load, the detection of the engine speed and engine load Means for calculating the addition amount of the reducing agent from the value, and adding the reducing agent by multiplying the calculated amount by a constant α of 1 or less.
The means for determining the amount and the amount of reducing agent added to this determined amount
Control means, and return when the temperature of the reduction catalyst is equal to or higher than a predetermined value.
The constant α is initially set according to the elapsed time from the start of the addition of the base agent.
Means for gradually increasing the period value to 1 .
【０００７】[0007]
【作用】請求項１に記載の考案においては、還元触媒の
温度が所定値（触媒活性が得られる温度）以上になる
と、還元剤の添加開始時と判定される。還元剤の添加量
は、エンジン回転数とエンジン負荷の検出値から算出さ
れるが、その算出量に定数αを掛けて決定されるのであ
り、定数αは還元剤の添加開始時点からの経過時間に応
じて初期値から１に漸増する。その結果、還元剤の添加
量は触媒が活性化する度合いに応じて算出値へと漸増す
るように制御されるため、還元触媒の温度は所定値以上
でも、触媒の活性化がまだ十分でなく、還元剤の一部が
未反応のまま排出されてしまうのを抑えることができ
る。According to the first aspect of the present invention, the reduction catalyst is used.
The temperature is higher than a predetermined value (the temperature at which catalytic activity can be obtained)
It is determined that the addition of the reducing agent has started. Amount of reducing agent added
Is calculated from the detected value of the engine speed and the engine load.
Is calculated by multiplying the calculated amount by a constant α.
The constant α depends on the elapsed time from the start of the addition of the reducing agent.
Then, it gradually increases from the initial value to 1. As a result, the addition of a reducing agent
The amount gradually increases to the calculated value according to the degree of activation of the catalyst
Control so that the temperature of the reduction catalyst
However, the activation of the catalyst is not yet enough and some of the reducing agent
It is possible to suppress the discharge without being reacted
You .
【０００８】[0008]
【実施例】以下、本考案の実施例を添付図面に基づいて
説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below 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 diesel engine 1
The reduction catalyst 3 is interposed in the middle of the exhaust passage 2. The reduction catalyst 3 has a structure in which a base material such as alumina, silica, zeolite and the like and a catalyst material composed of a metal such as copper are supported on a honeycomb-shaped carrier, and in a oxidizing atmosphere or in the presence of a hydrocarbon, a nitrogen oxide is used. By contacting an 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 means for adding the reducing agent upstream 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 exhaust passage 2 upstream of the reduction catalyst 3 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 means for detecting the temperature of the reduction catalyst 3,
A temperature sensor 7 for detecting the temperature of exhaust gas is disposed immediately upstream of the reduction catalyst 3. Note that a sensor that directly detects the temperature of the reduction catalyst 3 may be provided as a unit that detects the temperature of the reduction catalyst 3.
【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は温度センサ７
の検出値から還元触媒３の入口温度が触媒の活性化が始
まる所定値Ｔ １ 以上になると還元剤の添加開始時を判定
する手段（添加開始判定手段１１）と、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を算出する手段（添加量算出手段１
３）と、添加装置５への指令（制御信号）を制御する手
段（添加量制御手段１４）と、を備える。添加量制御手
段１４は図示しないが、還元剤の算出量Ｍに１以下の定
数αを掛けて還元剤の添加量（Ｍ×α）を決定する手段
と、この決定量（Ｍ×α）に相当する制御信号を出力す
る手段と、還元触媒の温度が所定値以上のときに還元剤
の添加開始時点からの経過時間に応じて定数αを初期値
α １ から１に漸増させる手段と、から構成される。 In the figure, reference numeral 6 denotes a control device for controlling the amount of the reducing agent added from the adding device 5. The control device 6 includes a temperature sensor 7
From the detected value of, the inlet temperature of the reduction catalyst 3 starts activation of the catalyst.
Determining at the start of addition of the reducing agent and circle a predetermined value above T 1
(Addition start determination means 11) and the engine speed
And the detection signal from the engine load detection means 12
Means for calculating the addition amount M of the reducing agent (addition amount calculation means 1)
3) and a method of controlling a command (control signal) to the adding device 5
(Addition amount control means 14). Addition amount control
The stage 14 is not shown, but the calculated amount M of the reducing agent is set to a value of 1 or less.
Means for determining the addition amount (M × α) of the reducing agent by multiplying by a number α
And outputs a control signal corresponding to the determined amount (M × α).
Means for reducing the reducing agent when the temperature of the reducing catalyst is equal to or higher than a predetermined value.
Initial value of constant α according to the elapsed time from the start of
means for gradually increasing from α 1 to 1.
【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。FIG. 2 is a flowchart showing a control program executed by the control device 6 for adding a reducing agent, which is performed at regular 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。To explain this, first, step 1
Then, the engine speed N and the engine load Q are read, and in step 2, the addition amount M of the reducing agent according to these operating conditions 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Ｔ
1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 detected temperature T of the temperature sensor 7 is read, and in step 4, the catalyst inlet temperature T is set to a predetermined value T.
Determine if it is 1 or more. When the catalyst inlet temperature T reaches a predetermined value T 1
If it is lower, 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。If the catalyst inlet temperature T is equal to or higher than the predetermined value T 1 , the routine proceeds to step 5 where 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。If it is determined in step 6 that the elapsed time t is shorter than the predetermined time t 1 , the flow advances to step 7 to calculate the addition amount 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。If 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 added 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 program proceeds to steps 10, 11, and 12, and as the elapsed time t increases, the addition amount of the reducing agent is gradually increased to a 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 time t elapses after the inlet temperature T of the reduction catalyst 3 exceeds a predetermined value T 1 at which a predetermined catalyst activity can be obtained, the activation of the catalyst is started. 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 amount of addition is increased stepwise according to the elapsed time, whereby the catalyst is reduced according to the activated state. As a result, the reduction efficiency of nitrogen oxides can be promptly increased, and the emission amount of total hydrocarbons (THC) can be rapidly reduced. It can be suppressed from being discharged 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。[0023] Incidentally, as means for determining the operating condition detecting temperature of the reduction catalyst rises above a predetermined value, instead of determining the detected temperature T of the temperature sensor 7 whether a predetermined value above T 1, the engine speed The start of the addition of the reducing agent may be determined based on the detected values of N and the engine load Q.
【００２４】[0024]
【考案の効果】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、この検出温度から還元触
媒の温度が所定値以上になると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、その算出量に１以下
の定数αを掛けて還元剤の添加量を決定する手段と、こ
の決定量に還元剤の添加量を制御する手段と、還元触媒
の温度が所定値以上のときに還元剤の添加開始時点から
の経過時間に応じて定数αを初期値から１に漸増させる
手段とを備えるため、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, according to the present invention, the reduction catalyst interposed in the exhaust passage of the diesel engine, the means for adding the reducing agent upstream of the reduction catalyst, and the detection of the temperature of the reduction catalyst means for, touch reduced from this detected temperature
Means for determining when to start adding the reducing agent when the temperature of the medium becomes equal to or higher than a predetermined value ; means for detecting the engine speed and the engine load; and calculating the amount of the reducing agent added from the detected values of the engine speed and the engine load. Means and the calculated amount is 1 or less
Means for determining the amount of reducing agent to be added by multiplying by the constant α of
Means for controlling the addition amount of the reducing agent to the determined amount, and the reduction catalyst
From the time when the addition of the reducing agent starts when the temperature of the
Gradually increases the constant α from the initial value to 1 according to the elapsed time of
Means , the reducing agent is added in accordance with the degree of activation of the catalyst, so that the warming-up of the catalyst takes time and the reducing agent is discharged unreacted due to a response delay. Can be suppressed.
【図１】本考案の一実施例を示す構成図。FIG. 1 is a configuration 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 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 determination means 12 Engine speed and load detection means 13 Reducing agent addition amount calculation means 14 Reducing agent addition control means
Claims (1)
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、この検出温度から還元触媒の
温度が所定値以上になると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、その算出量に１以下の定
数αを掛けて還元剤の添加量を決定する手段と、この決
定量に還元剤の添加量を制御する手段と、還元触媒の温
度が所定値以上のときに還元剤の添加開始時点からの経
過時間に応じて定数αを初期値から１に漸増させる手段
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。A reduction catalyst interposed in the exhaust passage;
Means for adding a reducing agent to the upstream side of the reduction catalyst, and means for detecting the temperature of the reduction catalyst, the reduction catalyst from the detected temperature
Means for determining when to start adding the reducing agent when the temperature is equal to or higher than a predetermined value ; means for detecting the engine speed and the engine load; and means for calculating the amount of the reducing agent added from the detected values of the engine speed and the engine load. And the calculated amount is less than 1
A means for determining the amount of reducing agent to be added by multiplying by a number α;
Means for controlling the amount of the reducing agent added for the determination, and the temperature of the reduction catalyst
When the degree is equal to or higher than the predetermined value,
Means for gradually increasing the constant α from the initial value to 1 according to the elapsed time
And an exhaust purification device for a diesel engine.
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 JPH0673317U (en) | 1994-10-18 |
| JP2589592Y2 true JP2589592Y2 (en) | 1999-01-27 |
Family
ID=11852011
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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3613676B2 (en) * | 2000-07-24 | 2005-01-26 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP3906135B2 (en) * | 2002-09-27 | 2007-04-18 | 日野自動車株式会社 | Method for removing sulfate from particulate filter |
-
1993
- 1993-03-25 JP JP1993014111U patent/JP2589592Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0673317U (en) | 1994-10-18 |
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