JP6432401B2 - 排気浄化システム - Google Patents
排気浄化システム Download PDFInfo
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- JP6432401B2 JP6432401B2 JP2015050412A JP2015050412A JP6432401B2 JP 6432401 B2 JP6432401 B2 JP 6432401B2 JP 2015050412 A JP2015050412 A JP 2015050412A JP 2015050412 A JP2015050412 A JP 2015050412A JP 6432401 B2 JP6432401 B2 JP 6432401B2
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- 238000000746 purification Methods 0.000 title claims description 11
- 238000002347 injection Methods 0.000 claims description 134
- 239000007924 injection Substances 0.000 claims description 134
- 239000000446 fuel Substances 0.000 claims description 49
- 239000003054 catalyst Substances 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 22
- 230000008929 regeneration Effects 0.000 claims description 12
- 238000011069 regeneration method Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000010926 purge Methods 0.000 description 81
- 238000012937 correction Methods 0.000 description 39
- 239000007789 gas Substances 0.000 description 14
- 238000007254 oxidation reaction Methods 0.000 description 12
- 238000011144 upstream manufacturing Methods 0.000 description 12
- 230000006866 deterioration Effects 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- Engineering & Computer Science (AREA)
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Description
NOxパージリーン制御部60及び、NOxパージリッチ制御部70は、本発明の触媒再生手段であって、排気をリッチ雰囲気にしてNOx吸蔵還元型触媒32に吸蔵されているNOxを還元浄化により無害化して放出することで、NOx吸蔵還元型触媒32のNOx吸蔵能力を回復させる制御(以下、この制御をNOxパージ制御という)を実行する。
図3は、NOxパージリーン制御部60によるMAF目標値MAFNPL_Trgtの設定処理を示すブロック図である。第1目標空気過剰率設定マップ61は、エンジン回転数Ne及びアクセル開度Qに基づいて参照されるマップであって、これらエンジン回転数Neとアクセル開度Qとに対応したNOxパージリーン制御時の空気過剰率目標値λNPL_Trgtが予め実験等に基づいて設定されている。
数式(1)において、Qfnl_corrdは後述する学習補正された燃料噴射量(ポスト噴射を除く)、RoFuelは燃料比重、AFRstoは理論空燃比、Maf_corrは後述するMAF補正係数をそれぞれ示している。
図4は、NOxパージリッチ制御部70による排気管噴射又はポスト噴射の目標噴射量QNPR_Trgt(単位時間当たりの噴射量)の設定処理を示すブロック図である。第2目標空気過剰率設定マップ75は、エンジン回転数Ne及びアクセル開度Qに基づいて参照されるマップであって、これらエンジン回転数Neとアクセル開度Qとに対応したNOxパージリッチ制御時の空気過剰率目標値λNPR_Trgtが予め実験等に基づいて設定されている。
数式(2)において、MAFNPL_TrgtはNOxパージリーンMAF目標値であって、前述のMAF目標値演算部62から入力される。また、Qfnl_corrdは後述する学習補正されたMAF追従制御適用前の燃料噴射量(ポスト噴射を除く)、RoFuelは燃料比重、AFRstoは理論空燃比、Maf_corrは後述するMAF補正係数をそれぞれ示している。
NOxパージ制御は、(1)NOxパージリッチフラグFNPRのオンから排気管噴射又はポスト噴射の噴射量を累積し、この累積噴射量が所定の上限閾値量に達した場合、(2)NOxパージ制御の開始から計時した経過時間が所定の上限閾値時間に達した場合、(3)エンジン10の運転状態やNOx/ラムダセンサ45のセンサ値等を入力信号として含む所定のモデル式に基づいて演算されるNOx吸蔵還元型触媒32のNOx吸蔵量がNOx除去成功を示す所定の閾値まで低下した場合の何れかの条件が成立すると、NOxパージリーンフラグFNPL及び、NOxパージリッチフラグFNPRをオフにして終了される(図2の時刻t3参照)。
MAF追従制御部80は、(1)通常運転のリーン状態からNOxパージ制御によるリッチ状態への切り替え期間及び、(2)NOxパージ制御によるリッチ状態から通常運転のリーン状態への切り替え期間に、各インジェクタ11の燃料噴射タイミング及び燃料噴射量をMAF変化に応じて補正する制御(以下、この制御をMAF追従制御という)を実行する。
図8に示すように、噴射量学習補正部90は、学習補正係数演算部91と、噴射量補正部92とを有する。
MAF補正係数演算部95は、NOxパージ制御時のMAF目標値MAFNPL_Trgtや目標噴射量QNPR_Trgtの設定に用いられるMAF補正係数Maf_corrを演算する。
なお、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。
11 インジェクタ
12 吸気通路
13 排気通路
16 吸気スロットルバルブ
24 EGRバルブ
31 酸化触媒
32 NOx吸蔵還元型触媒
33 フィルタ
34 排気管噴射装置
40 MAFセンサ
45 NOx/ラムダセンサ
50 ECU
Claims (1)
- 内燃機関の排気系に設けられて排気中のNOxを浄化するNOx触媒と、
前記内燃機関の空気流量を取得する空気流量取得手段と、
前記内燃機関の空気流量を所定の目標空気流量まで減少させる空気系制御と、燃料噴射量を増加させる噴射系制御とを併用して、前記NOx触媒のNOx浄化能力を回復させる触媒再生処理を実施する触媒再生手段と、を備え、
前記触媒再生手段は、前記触媒再生処理を実施する場合に、前記空気系制御から開始し、前記空気流量取得手段によって取得される空気流量が前記目標空気流量まで減少すると、前記噴射系制御を開始し、
前記噴射系制御を開始した後に、前記空気流量取得手段によって取得される空気流量の前記目標空気流量に対する増加量が所定の閾値以下であれば、当該噴射系制御を継続させ、前記空気流量取得手段よって取得される空気流量の前記目標空気流量に対する増加量が所定の閾値を超えた場合は、当該噴射系制御を強制終了させる
排気浄化システム。
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US15/558,180 US10675587B2 (en) | 2015-03-13 | 2016-03-08 | Exhaust purification system |
CN201680015223.2A CN107429590B (zh) | 2015-03-13 | 2016-03-08 | 排气净化系统 |
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US6990951B1 (en) * | 2004-07-12 | 2006-01-31 | International Engine Intellectual Property Company, Llc | Torque control strategy for a diesel engine during lean-rich modulation using independent fuel injection maps |
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JP2008202425A (ja) | 2007-02-16 | 2008-09-04 | Mitsubishi Motors Corp | 排ガス浄化装置 |
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US7831374B2 (en) * | 2008-06-06 | 2010-11-09 | Southwest Research Institute | Combustion control system for internal combustion engine with rich and lean operating conditions |
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