JP5087836B2 - 排気ガス浄化システムの制御方法及び排気ガス浄化システム - Google Patents
排気ガス浄化システムの制御方法及び排気ガス浄化システム Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 16
- 239000007789 gas Substances 0.000 claims description 304
- 239000003054 catalyst Substances 0.000 claims description 167
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- 230000003647 oxidation Effects 0.000 claims description 70
- 238000007254 oxidation reaction Methods 0.000 claims description 70
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- 229910052760 oxygen Inorganic materials 0.000 claims description 58
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 12
- 230000003197 catalytic effect Effects 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 117
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- 229910021529 ammonia Inorganic materials 0.000 description 2
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- 238000006477 desulfuration reaction Methods 0.000 description 2
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- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
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- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
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- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
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- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
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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
- B01D53/9495—Controlling the catalytic process
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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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
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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Description
この制御では、図3〜図5に示すような酸化触媒12のライトオフ用データを予め用意して制御装置20に記憶しておく。このライトオフ用データは、次のようにして求める。
温度Tgi、酸素濃度Co2、CO濃度Cco、HC濃度Chcと目標HC浄化率ηphcとの関係に基づいて、酸化触媒12に流入する排気ガスの温度Tgim、排気ガス成分濃度検出手段で検出された、酸素濃度Co2m、CO濃度Ccom、HC濃度Chcmから、供給すべきHC量Ahcを算出して設定することができる。
1 排気ガス浄化システム
2 吸気通路
4 排気通路
8 燃料噴射弁
10 排気ガス浄化装置
11 触媒付きフィルタ(DPF)
12 酸化触媒
13 HC供給装置
21 差圧センサ
22 触媒入口排気温度センサ
23 触媒出口排気温度センサ
24 フィルタ出口排気温度センサ
25 上流側のガス成分濃度センサ
26 下流側のガス成分濃度センサ
Claims (4)
- 内燃機関の排気通路に排気ガス浄化装置を備えると共に、還元剤の供給量及び供給時期を調整しながら、前記排気ガス浄化装置に流入する排気ガス中に還元剤を供給する還元剤供給手段と、排気ガスの温度を検出する排気ガス温度検出手段と、排気ガス中の酸素濃度、CO濃度、HC濃度を検出する排気ガス成分濃度検出手段とを備え、前記還元剤供給手段が、前記排気ガス温度検出手段で検出された排気ガスの温度が、所定の判定用温度以上のときに、前記排気ガス浄化装置に流入する排気ガス中に還元剤を供給する制御を行う制御装置を有する排気ガス浄化システムの排気ガス浄化方法において、
還元剤の供給に際して、前記排気ガス浄化装置に流入する排気ガスの酸素濃度、CO濃度、HC濃度と所定の判定用温度との関係に基づいて、前記排気ガス成分濃度検出手段で検出された前記排気ガス浄化装置に流入する排気ガスの酸素濃度、CO濃度、HC濃度から、前記所定の判定用温度を設定すると共に、
前記排気ガス浄化装置に流入する排気ガスの温度、酸素濃度、CO濃度と消費可能なHC量との関係に基づいて、前記排気ガス浄化装置に流入する排気ガスの温度、酸素濃度、CO濃度、HC濃度から、排気ガス中に供給する還元剤の供給量を、前記消費可能なHC量から排気ガス中のHC量を差し引いた値で算出して設定し、該供給量で還元剤を排気ガス中に供給することを特徴とする排気ガス浄化システムの制御方法。 - 前記排気ガス浄化装置が、酸化触媒、触媒付きディーゼルパテイキュレートフィルタ、NOx吸蔵還元型触媒、直接還元型NOx触媒、選択的接触触媒の内の一つ以上を備えたことを特徴とする請求項1記載の排気ガス浄化システムの制御方法。
- 内燃機関の排気通路に排気ガス浄化装置を備えると共に、還元剤の供給量及び供給時期を調整しながら、前記排気ガス浄化装置に流入する排気ガス中に還元剤を供給する還元剤供給手段と、排気ガスの温度を検出する排気ガス温度検出手段と、排気ガス中の酸素濃度、CO濃度、HC濃度を検出する排気ガス成分濃度検出手段とを備え、前記還元剤供給手段が、前記排気ガス温度検出手段で検出された排気ガスの温度が、所定の判定用温度以上のときに、前記排気ガス浄化装置に流入する排気ガス中に還元剤を供給する制御を行う制御装置を有する排気ガス浄化システムにおいて、
前記制御装置が、還元剤の供給に際して、前記排気ガス浄化装置に流入する排気ガスの酸素濃度、CO濃度、HC濃度と所定の判定用温度との関係に基づいて、前記排気ガス成分濃度検出手段で検出された前記排気ガス浄化装置に流入する排気ガスの酸素濃度、CO濃度、HC濃度から、前記所定の判定用温度を設定すると共に、
前記排気ガス浄化装置に流入する排気ガスの温度、酸素濃度、CO濃度と消費可能なHC量との関係に基づいて、前記排気ガス浄化装置に流入する排気ガスの温度、酸素濃度、CO濃度、HC濃度から、排気ガス中に供給する還元剤の供給量を、前記消費可能なHC量から排気ガス中のHC量を差し引いた値で算出して設定し、該供給量で還元剤を排気ガス中に供給することを特徴とする排気ガス浄化システム。 - 前記排気ガス浄化装置が、酸化触媒、触媒付きディーゼルパテイキュレートフィルタ、NOx吸蔵還元型触媒、直接還元型NOx触媒、選択的接触触媒の内の一つ以上を備えたことを特徴とする請求項3記載の排気ガス浄化システム。
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CN2006800449353A CN101316993B (zh) | 2005-12-14 | 2006-11-22 | 废气净化系统的控制方法以及废气净化系统 |
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