JP4069044B2 - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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- JP4069044B2 JP4069044B2 JP2003320030A JP2003320030A JP4069044B2 JP 4069044 B2 JP4069044 B2 JP 4069044B2 JP 2003320030 A JP2003320030 A JP 2003320030A JP 2003320030 A JP2003320030 A JP 2003320030A JP 4069044 B2 JP4069044 B2 JP 4069044B2
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- reducing agent
- exhaust
- supply
- temperature
- exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/065—Surface coverings for exhaust purification, e.g. catalytic reaction for reducing soot ignition temperature
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- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
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- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
請求項1記載の発明は、排気ガスの空燃比が相対的にリーンであるときに排気ガス中の物質を吸蔵するとともに同空燃比が相対的にリッチであるときに前記物質を還元して放出する吸蔵還元触媒を備える内燃機関の排気浄化装置において、前記吸蔵還元触媒に吸蔵された物質を還元して当該機関の下流側に排出させるべく前記吸蔵還元触媒の上流側から還元剤の供給を開始した後、同還元剤の供給を一旦停止するとともに同還元剤の供給の開始に伴う排気系の温度の上昇の度合いを監視し、該監視結果に基づいて前記還元剤の供給を再開し、前記還元剤の供給は間欠的に行われるものであって、且つ前記還元剤の供給の開始に伴う前記排気系の温度の上昇の度合いが所定の閾値以下となるとき、1回当たりの還元剤の供給量を増加させることをその要旨とする。
請求項5記載の発明は、請求項1、2、及び4のいずれか1項に記載の発明において、前記還元剤の供給に伴って前記排気系の温度が所定の温度よりも高くなると、前記排気系の温度が所定量以上低下するまで前記還元剤の供給を禁止することをその要旨とする。
この点、上記構成によれば、こうした状況下において、排気系の温度が所定量以上低下するまで還元剤の供給を禁止することで、排気系の温度が過度に上昇することを好適に回避することができるようになる。
請求項8記載の発明は、請求項1、2、及び4〜7のいずれか1項に記載の発明において、前記排気ガスに含まれる微粒子を捕捉するフィルタを更に備えることをその要旨とする。
以下、本発明にかかる内燃機関の排気浄化装置をディーゼルエンジンの排気浄化装置に適用した第1の実施形態について説明する。
ここで、上記S被毒回復制御について更に詳述する。
図2は、本実施形態におけるS被毒回復制御を示すタイムチャートである。図2(a)は、S被毒回復制御の実行条件の成立の有無を、図2(b)は、排気経路34中の実際の空燃比をそれぞれ示している。また、図2(c)は、上記添加弁68から燃料の添加を行わないときにオンとなるフラグである添加カットフラグの状態を示している。また、図2(d)は、インクリメントとデクリメントとを繰り返し、そのインクリメント動作が上記添加弁68からの燃料の添加に対応するカウンタのカウント値を示している。また、図2(e)は、上記第1排気温センサ44又は第2排気温センサ46の検出値を示している。
(ア)S被毒回復を行う時期であると判断されたこと。これは、例えば前回のS被毒回復制御が終了したときから現在までの燃料噴射量の積算値が算出され、この積算値が所定値を上回っているか否かによって判断するようにすればよい。
(イ)上記(ア)の条件が成立することによって、排気フィルタ38近傍の温度を高温化(例えば600〜700℃)する昇温制御が完了していること。ちなみに、本実施形態では、排気フィルタ38近傍の温度として、上記第1排気温センサ44及び第2排気温センサ46の各検出値を用いている。
(ウ)S被毒回復制御が開始されている場合、SOxの還元が行われるのに十分な時間がまだ経過していないこと。
なお、上記ステップ250において上記論理積条件が満たされないと判断されたときや、ステップ270においてカウンタ値が「0」でないと判断されたとき、ステップ280やステップ290の処理が終了したときには、この一連の処理を一旦終了する。
(1)S被毒回復制御によって上記添加弁68から間欠的な燃料の添加を行うに際し、初回の燃料の添加後、同燃料の添加に伴う温度の上昇の度合いを監視し、該監視結果に基づいて2回目以降の燃料の添加の再開を決定するようにした。これにより、排気フィルタ38近傍の温度が過度に上昇することを回避することができるようになる。
以下、本発明にかかる内燃機関の排気浄化装置をディーゼルエンジンの排気浄化装置に適用した第2の実施形態について、上記第1の実施形態との相違点を中心に説明する。
(3)第1排気温センサ44や第2排気温センサ46の検出値の最大値が大きくなるほど1回当たりの燃料の添加量を減少させることで、上記検出値の上昇を好適に抑制することができるようになる。更に、こうした制御によれば、上記検出値が上昇するほど各回の燃料の添加タイミング間を離間させる場合よりも検出値の変動を低減することもできる。
以下、本発明にかかる内燃機関の排気浄化装置をディーゼルエンジンの排気浄化装置に適用した第3の実施形態について、上記第2の実施形態との相違点を中心に説明する。
(エ)第1排気温センサ44の検出値がディーゼルエンジン2の運転状態によって定まるマップによって規定される上限値未満であること。この上限値は、例えばリッチスパイクによって排気フィルタ38近傍の温度が同排気フィルタ38の浄化性能を劣化させるほど上昇しないと考えられる値に設定する。
(オ)第2排気温センサ46の検出値が所定の温度(例えば660℃)未満であること。この所定の温度は、例えばリッチスパイクによって排気フィルタ38近傍の温度が同排気フィルタ38の浄化性能を劣化させるほど上昇しないと考えられる値に設定する。
(4)排気温センサの検出値が所定値を上回ると、同検出値が所定量ΔT以上低下するまでリッチスパイクを禁止した。これにより、排気フィルタ38の近傍の温度の過度の上昇を回避することができるようになる。
なお、上記各実施形態は以下のように変更して実施することもできる。
・2回目以降の燃料の添加量を1回目の燃料の添加量と比べて増加させる制御を行わなくても、先の第1の実施形態の上記(1)の効果を得ることはできる。
・燃料の添加を開始した後、同燃料の添加を一旦停止するとともに同燃料の添加の開始に伴う排気温度の検出値の上昇の度合いを監視し、該監視結果に基づいて燃料の添加を再開する手法としては、初回の添加後に排気温度の検出値の上昇度合いを監視するものに限らない。例えば複数回の燃料の添加後に上記検出値の上昇度合いを監視するようにしてもよい。
Claims (8)
- 排気ガスの空燃比が相対的にリーンであるときに排気ガス中の物質を吸蔵するとともに同空燃比が相対的にリッチであるときに前記物質を還元して放出する吸蔵還元触媒を備える内燃機関の排気浄化装置において、
前記吸蔵還元触媒に吸蔵された物質を還元して当該機関の下流側に排出させるべく前記吸蔵還元触媒の上流側から還元剤の供給を開始した後、同還元剤の供給を一旦停止するとともに同還元剤の供給の開始に伴う排気系の温度の上昇の度合いを監視し、該監視結果に基づいて前記還元剤の供給を再開し、前記還元剤の供給は間欠的に行われるものであって、且つ前記還元剤の供給の開始に伴う前記排気系の温度の上昇の度合いが所定の閾値以下となるとき、1回当たりの還元剤の供給量を増加させる
ことを特徴とする内燃機関の排気浄化装置。 - 排気ガスの空燃比が相対的にリーンであるときに排気ガス中の物質を吸蔵するとともに同空燃比が相対的にリッチであるときに前記物質を還元して放出する吸蔵還元触媒を備える内燃機関の排気浄化装置において、
前記吸蔵還元触媒に吸蔵された物質を還元して当該機関の下流側に排出させるべく前記吸蔵還元触媒の上流側から還元剤の供給を開始した後、同還元剤の供給を一旦停止するとともに同還元剤の供給の開始に伴う排気系の温度の上昇の度合いを監視し、該監視結果に基づいて前記還元剤の供給を再開し、前記還元剤の供給は間欠的に行われるものであって、且つ前記還元剤の供給の開始後における初回の前記還元剤の供給量を2回目以降の前記還元剤の供給量に比して低減させる
ことを特徴とする内燃機関の排気浄化装置。 - 排気ガスの空燃比が相対的にリーンであるときに排気ガス中の物質を吸蔵するとともに同空燃比が相対的にリッチであるときに前記物質を還元して放出する吸蔵還元触媒を備える内燃機関の排気浄化装置において、
前記吸蔵還元触媒に吸蔵された物質を還元して当該機関の下流側に排出させるべく前記吸蔵還元触媒の上流側から間欠的な前記還元剤の供給を行うとともに、該還元剤の供給開始後における初回の前記還元剤の供給量を2回目以降の前記還元剤の供給量に比して低減させる
ことを特徴とする内燃機関の排気浄化装置。 - 請求項1又は2に記載の内燃機関の排気浄化装置において、
前記還元剤の供給は間欠的に行われるものであって、且つ前記排気系の温度が高くなるにつれて1回当たりの還元剤の供給量を減少させる
ことを特徴とする内燃機関の排気浄化装置。 - 請求項1、2、及び4のいずれか1項に記載の内燃機関の排気浄化装置において、
前記還元剤の供給に伴って前記排気系の温度が所定の温度よりも高くなると、前記排気系の温度が所定量以上低下するまで前記還元剤の供給を禁止する
ことを特徴とする内燃機関の排気浄化装置。 - 請求項1、2、4、及び5のいずれか1項に記載の内燃機関の排気浄化装置において、
前記還元剤の供給は、周期的にインクリメントとデクリメントとを繰り返すカウンタのカウント値がインクリメントされているときに行うものであって、
前記還元剤の供給が禁止される所定の条件下、前記カウンタのカウント値のインクリメントを禁止するとともに同カウント値を初期値までデクリメントする
ことを特徴とする内燃機関の排気浄化装置。 - 前記吸蔵還元触媒に吸蔵された物質であって且つ前記還元剤の供給により当該機関の下流側に排出させる物質が酸化硫黄である
請求項1、2、及び4〜6のいずれか1項に記載の内燃機関の排気浄化装置。 - 請求項1、2、及び4〜7のいずれか1項に記載の内燃機関の排気浄化装置において、
前記排気ガスに含まれる微粒子を捕捉するフィルタを更に備える
ことを特徴とする内燃機関の排気浄化装置。
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ES04021630T ES2279269T3 (es) | 2003-09-11 | 2004-09-10 | Aparato de purificacion de escape de un motor de combustion interna. |
DE602004004843T DE602004004843T2 (de) | 2003-09-11 | 2004-09-10 | Vorrichtung zur Abgasreinigung einer Brennkraftmaschine |
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JP4311441B2 (ja) * | 2006-12-21 | 2009-08-12 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
FR2914946B1 (fr) * | 2007-04-12 | 2009-05-22 | Renault Sas | Systeme de traitement des gaz d'echappement pour moteur a combustion interne |
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JP2016133050A (ja) * | 2015-01-19 | 2016-07-25 | いすゞ自動車株式会社 | 排気浄化システム |
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