JP2016098692A - 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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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 87
- 239000003054 catalyst Substances 0.000 claims abstract description 125
- 239000000446 fuel Substances 0.000 claims abstract description 82
- 238000010926 purge Methods 0.000 claims abstract description 35
- 238000000746 purification Methods 0.000 claims description 57
- 238000003795 desorption Methods 0.000 claims description 49
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 33
- 239000007924 injection Substances 0.000 abstract description 33
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 abstract description 13
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 12
- 239000004202 carbamide Substances 0.000 abstract description 12
- 239000000243 solution Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 79
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 50
- 238000000034 method Methods 0.000 description 41
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 24
- 230000007423 decrease Effects 0.000 description 16
- 238000006722 reduction reaction Methods 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
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- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
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Abstract
Description
前記排気通路の前記第1触媒より下流に設けられ、前記排気通路に還元剤を添加する添加弁と、
前記排気通路の前記添加弁より下流に設けられ、前記還元剤によりNOxを選択的に還元する第2触媒と、
前記第1触媒に吸蔵されたNOxのパージを要求するか否かを判定するパージ判定手段と、
前記パージ判定手段がパージを要求すると判定した場合に、前記第1触媒に吸蔵されたNOxが還元されるようリッチ雰囲気にする前記内燃機関の燃焼制御であるリッチ燃焼制御とは異なる制御であって、前記第1触媒を昇温させることで、前記第1触媒に吸蔵されたNOxを脱離させる昇温制御を実行する昇温実行手段と、
前記昇温制御の実行により前記第1触媒から脱離したNOxを前記第2触媒で還元させるよう前記添加弁による還元剤添加を実行する添加制御手段と、
を備えることを特徴とする。
4NO+4NH3+O2→4N2+6H2O ・・・(式1)
6NO2+8NH3→7N2+3H2O ・・・(式2)
NO+NO2+2NH3→2N2+3H2O ・・・(式3)
ここで、図2で説明したように、LNT温度がある温度T1以上では高温になるほどNOx吸蔵限界量は低下する。NOx吸蔵限界量が低下して、NOx吸蔵量がNOx吸蔵限界量を超過すると、この超過分は短い時間で一度に(瞬時に)放出されてしまう。その結果、SCR触媒10に一度に大量のNOxが流入してしまい、SCR触媒10でNOxを浄化しきれず、テールパイプNOxが悪化してしまう(図6(j)の時間d1−d2の点線部分)。S6の昇温制御では、このような事態を防ぐために、SCR触媒10のNOx浄化能力を考慮して、LNT8の昇温速度を制御している。以下、S6の昇温制御の詳細を説明する。
目標NOx吸蔵限界量=現時点のNOx吸蔵量−目標NOx脱離速度×演算周期 ・・・(式4)
目標LNT昇温速度=(目標LNT温度−現時点のLNT温度)/演算周期 ・・・(式5)
2 ディーゼルエンジン(内燃機関)
7 排気通路
8 LNT(NOx吸蔵還元触媒、第1触媒)
9 添加弁
10 SCR触媒(NOx選択還元触媒、第2触媒)
16 ECU
Claims (7)
- 内燃機関(2)の排気通路(7)に設けられ、リーン雰囲気においてNOxを吸蔵しリッチ雰囲気において吸蔵されたNOxを還元する第1触媒(8)と、
前記排気通路の前記第1触媒より下流に設けられ、前記排気通路に還元剤を添加する添加弁(9)と、
前記排気通路の前記添加弁より下流に設けられ、前記還元剤によりNOxを選択的に還元する第2触媒(10)と、
前記第1触媒に吸蔵されたNOxのパージを要求するか否かを判定するパージ判定手段(S1、S2)と、
前記パージ判定手段がパージを要求すると判定した場合に、前記第1触媒に吸蔵されたNOxが還元されるようリッチ雰囲気にする前記内燃機関の燃焼制御であるリッチ燃焼制御とは異なる制御であって、前記第1触媒を昇温させることで、前記第1触媒に吸蔵されたNOxを脱離させる昇温制御を実行する昇温実行手段(S5、S6、S8)と、
前記昇温制御の実行により前記第1触媒から脱離したNOxを前記第2触媒で還元させるよう前記添加弁による還元剤添加を実行する添加制御手段(S7)と、
を備えることを特徴とする内燃機関の排気浄化装置(1)。 - 前記第1触媒に流入する排気ガスの温度である入りガス温度を取得するガス温度取得手段(11、S4)と、
前記パージ判定手段がパージを要求すると判定した場合に、前記入りガス温度が第1閾値未満のときには、前記リッチ燃焼制御を実行するリッチ燃焼実行手段(S10、S11、S13)とを備え、
前記昇温実行手段は、前記入りガス温度が前記第1閾値以上のときに前記昇温制御を実行することを特徴とする請求項1に記載の内燃機関の排気浄化装置。 - 前記第1触媒の温度を取得する触媒温度取得手段(S8、11)を備え、
前記昇温実行手段は、前記第1触媒の温度が第2閾値以上となるまで前記昇温制御を実行することを特徴とする請求項2に記載の内燃機関の排気浄化装置。 - 前記昇温実行手段は、
前記第2触媒の状態を取得して、その状態に基づいて前記第2触媒のNOx浄化能力を算出する浄化能力算出手段(S24)と、
前記第1触媒のNOx脱離速度の目標値である目標脱離速度を前記NOx浄化能力に応じて設定する脱離速度設定手段(S25)と、
前記第1触媒のNOx脱離速度が前記目標脱離速度となるように前記第1触媒の昇温速度を制御する昇温速度制御手段(S26〜S31)とを備えることを特徴とする請求項1〜3のいずれか1項に記載の内燃機関の排気浄化装置。 - 前記昇温実行手段は、
前記第1触媒のNOx吸蔵限界量を取得する限界量取得手段(S21)と、
前記第1触媒の現時点のNOx吸蔵量を取得する吸蔵量取得手段(S22)と、
前記NOx吸蔵限界量と前記NOx吸蔵量の差が所定量未満か否かを判定する判定手段(S23)とを備え、
前記昇温速度制御手段は、前記差が前記所定量未満であると前記判定手段が判定したときに、前記第1触媒のNOx脱離速度が前記目標脱離速度となるように前記第1触媒の昇温速度を制御することを特徴とする請求項4に記載の内燃機関の排気浄化装置。 - 前記昇温実行手段(S29、S30、S31)は、前記差が前記所定量以上のときには、前記第2触媒のNOx浄化能力にかかわらず前記第1触媒の昇温速度が一定値となるように前記昇温制御を実行することを特徴とする請求項5に記載の内燃機関の排気浄化装置。
- 前記昇温制御は、前記第1触媒に未燃燃料を供給することで前記第1触媒を昇温させる制御であり、
前記昇温速度制御手段は、
前記第1触媒のNOx脱離速度が前記目標脱離速度となるように前記第1触媒の昇温速度の目標値である目標昇温速度を設定する昇温速度設定手段(S26〜S28)と、
前記目標昇温速度に基づいて前記第1触媒への未燃燃料供給量の基準量を設定する基準量設定手段(S30)と、
前記基準量の未燃燃料を供給したときにおける前記第1触媒の実際のNOx脱離速度である実脱離速度を取得する脱離速度取得手段(S31、13)と、
前記目標脱離速度と前記実脱離速度との差を小さくする方向に前記基準量を補正する補正手段(S31)とを備えることを特徴とする請求項4〜6のいずれか1項に記載の内燃機関の排気浄化装置。
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JP6230005B1 (ja) * | 2016-08-02 | 2017-11-15 | マツダ株式会社 | エンジンの排気浄化装置 |
CN107503829A (zh) * | 2017-10-10 | 2017-12-22 | 广西玉柴机器股份有限公司 | 柴油机后处理装置 |
CN107642398A (zh) * | 2017-10-10 | 2018-01-30 | 广西玉柴机器股份有限公司 | 柴油机后处理装置 |
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