JP2019070376A - エンジン制御装置 - Google Patents
エンジン制御装置 Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims abstract description 21
- 239000000779 smoke Substances 0.000 claims abstract description 18
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims description 78
- 239000000446 fuel Substances 0.000 claims description 61
- 229920006395 saturated elastomer Polymers 0.000 claims description 46
- 238000003795 desorption Methods 0.000 claims description 29
- 238000000746 purification Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000006722 reduction reaction Methods 0.000 abstract description 34
- 239000003054 catalyst Substances 0.000 abstract description 22
- 230000008929 regeneration Effects 0.000 abstract description 20
- 238000011069 regeneration method Methods 0.000 abstract description 20
- 101150110390 Slc10a6 gene Proteins 0.000 abstract 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 168
- 238000010586 diagram Methods 0.000 description 22
- 230000006870 function Effects 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 229910000510 noble metal Inorganic materials 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- YREOLPGEVLLKMB-UHFFFAOYSA-N 3-methylpyridin-1-ium-2-amine bromide hydrate Chemical compound O.[Br-].Cc1ccc[nH+]c1N YREOLPGEVLLKMB-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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- 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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Abstract
Description
本発明の実施の形態1について図を参照して説明する。
図1は、実施の形態のシステム構成を示す図である。図1に示すシステムは、車両に搭載されるディーゼルエンジン10(以下単に「エンジン10」ともいう。)を備えたエンジン制御装置として構成されている。エンジン10の各気筒には、燃料としての軽油を噴射するインジェクタ12が設けられている。なお、図1に描かれるエンジン10は直列4気筒エンジンであるが、エンジン10の気筒数および気筒配列は特に限定されない。また、図1には、4つのインジェクタ12のうちの1つが描かれている。
本実施の形態では、ECU30によるエンジン制御として、DPF22bの昇温制御(以下「PM再生制御」ともいう。)が行われる。PM再生制御は、DPF22bで捕集したPMの推定値が除去要求量に到達したときに、燃料添加弁24から燃料を添加する制御である。例えば差圧センサ36で検出した圧力差が所定値に到達したときに、PMの推定値が除去要求量に到達したと判断することができる。燃料添加弁24から燃料を添加することでDOC22aにおいて添加燃料を酸化し、この酸化反応熱によりDPF22bの床温を600℃以上まで上昇させる。これにより、DPF22bで捕集したPMを燃焼除去できるので、DPF22bの捕集機能を回復させることができる。なお、DPF22bの床温を600℃以上に上昇させるための燃料添加弁24からの添加燃料量(以下「DPF用燃料量)は、DPFの床温と関連付けたマップに基づき決定されるものとする。このようなマップは例えばECU30のROMに記憶させておき、DPF22bの実際の床温に応じて適宜読み出すことができる。
ところで、ディーゼルエンジンの燃料や潤滑油には一般に硫黄が含まれており、燃料の燃焼に伴ってこうした硫黄からSOxが生成する。本実施の形態においても同様で、エンジン10での燃料の燃焼に伴ってSOxが生成する。生成したSOxはエンジン10から排出されて排気浄化装置22に流入し、主にDOC22aに吸着する。但し、DOC22aの床温が高くなると、ここに吸着していたSOxが脱離し始める。DOC22aの組成等により多少変動するものの、PM再生制御を行う温度域ではDOC22aからSOxが脱離して下流側に放出される。
DOC22aの下流における排気中のH2SO4の濃度が高くなり過ぎないように燃料添加弁24から燃料を添加すれば、PM再生制御中のサルフェート白煙の発生を抑制できる。そこで、本実施の形態のECU30は、制御モデルを用いてDOC22aの下流におけるSO3の濃度を算出する。そして、ECU30は、算出したSO3の濃度がサルフェート白煙に関する制約を満たすように、PM再生制御中のDOC22aの床温の目標温度(以下「目標床温Ttrg」ともいう。)を算出する。なお、このような制約SO3濃度(DOC22aの下流におけるSO3濃度の上限値)は、例えばECU30のROMに記憶させておくことができる。
本願の発明者は、PM再生制御中のDOC22aでのSOx反応について鋭意研究を重ねた。そして、PM再生制御中のDOC22aでは、SO2からSO3への酸化反応だけでなく、SO3からSO2への還元反応も活発に起きていることに着眼した。従来の技術のように、還元反応を考慮しない制御モデルでは、DOC22aから排出されるSO3量が実際よりも多く算出されてしまう。その結果、目標床温Ttrgは、実際に許容される床温よりも低い温度に設定される。この場合、PM再生制御の実行期間が長期化し、燃費の悪化を招いてしまう。
図3は、目標床温Ttrgを算出するためのロジックを示す機能ブロック図であり、これはECU30により実現される。この図に示すように、ECU30は、流入SOx量推定部M1と、SOx飽和率推定部M2と、新規吸着SOx量およびすり抜けSOx量推定部M3と、吸着後SOx分布推定部M4と、新規脱離SOx量推定部M5と、最終吸着SOx分布推定部M6と、すり抜けSO3量推定部M7と、SO2還元率推定部M8と、許容脱離SO3量算出部M9と、白煙抑制目標床温算出部M10と、を備えており、これらの要素M1〜M9によって制御周期ごとに(具体的にはエンジン10の燃焼サイクルごとに)目標床温Ttrgを算出するものとする。なお、以下の説明においては、要素M1〜M9を簡略化するものとし、例えば流入SOx量推定部M1を「推定部M1」ともいう。
12 インジェクタ
20 排気管
22 排気浄化装置
22a DOC
22b DPF
22c コート材
22d 貴金属
24 燃料添加弁
30 ECU
Claims (6)
- ディーゼルエンジンの排気管に設けられる浄化装置と、前記浄化装置に未燃燃料を供給する燃料供給手段と、前記燃料供給手段から未燃燃料を供給することにより前記浄化装置の温度を微粒子が燃焼する温度域の目標温度まで上昇させる昇温制御を実行する制御手段と、を有するエンジン制御装置であって、
前記制御手段は、
所定の制御周期ごとに前記浄化装置の温度の代表値である代表温度を取得する温度取得手段と、
前記浄化装置に流入するSOx量を流入SOx量として前記制御周期ごとに推定する流入SOx量推定手段と、
前記流入SOx量と前記代表温度とを用いて、前記浄化装置の温度上昇中の各温度において前記浄化装置に最終的に吸着するSOx量を前記代表温度に関連付けたグラフとして表される最終吸着SOx分布を前記制御周期ごとに推定する最終吸着SOx分布推定手段と、
前記流入SOx量と前記代表温度とを用いて、前記浄化装置にSOxの状態で流入して前記浄化装置に吸着することなくすり抜けるSOxのうちSO3に転化するSOx量をすり抜けSO3量として前記制御周期ごとに推定するすり抜けSO3量推定手段と、
前記浄化装置においてSO3からSO2へと還元される割合であるSO2還元率を推定するSO2還元率推定手段と、
サルフェート白煙に関する制約に相当する前記浄化装置の下流における制約SO3量と、前記すり抜けSO3量と、前記SO2還元率とを用いて、前記浄化装置から脱離することが許されるSO3量を許容脱離SO3量として前記制御周期ごとに算出する許容脱離SO3量算出手段と、
前記最終吸着SOx分布と前記許容脱離SO3量とを用いて、前記目標温度を前記制御周期ごとに算出する目標温度算出手段と、
を備えることを特徴とするエンジン制御装置。 - 前記SO2還元率推定手段は、
前記SO2還元率と、前記燃料供給手段による未燃燃料の供給量と、前記浄化装置に流入するガス量との関係に基づいて、前記SO2還元率を推定する
ように構成されていることを特徴とする請求項1に記載のエンジン制御装置。 - 前記すり抜けSO3量推定手段は、
前記浄化装置の温度上昇中の各温度において前記浄化装置に吸着するSOx量を前記代表温度に関連付けたグラフとして表される吸着SOx分布と、前記浄化装置の温度上昇中の各温度において前記浄化装置に吸着するSOx最大量を前記代表温度に関連付けたグラフとして表される飽和SOx分布と、を用いて、前記浄化装置におけるSOx飽和率を前記制御周期ごとに推定し、
前記流入SOx量と前記SOx飽和率とを用いて、前記浄化装置に流入して前記浄化装置に新たに吸着するSOx量を新規吸着SOx量として前記制御周期ごとに推定し、
前記新規吸着SOx量を用いて、前記浄化装置に流入して前記浄化装置に吸着することなくすり抜けるSOx量をすり抜けSOx量として前記制御周期ごとに推定し、
前記浄化装置においてSO3に転化するSO2の転化率と前記代表温度との関係を表した転化率マップと、前記代表温度と、前記すり抜けSOx量と、を用いて、前記すり抜けSO3量を前記制御周期ごとに推定する
ように構成されていることを特徴とする請求項1又は2に記載のエンジン制御装置。 - 前記最終吸着SOx分布推定手段は、
前記流入SOx量と前記代表温度とを用いて、前記浄化装置から新たに脱離するSOx量を新規脱離SOx量として前記制御周期ごとに推定し、
前記新規脱離SOx量を用いて、前記最終吸着SOx分布を前記制御周期ごとに推定する
ように構成されていることを特徴とする請求項1乃至3の何れか1項に記載のエンジン制御装置。 - 前記温度取得手段は、
前記排気管における前記浄化装置の下流側に流れたガスの温度を前記代表温度として取得する
ように構成されていることを特徴とする請求項1乃至4の何れか1項に記載のエンジン制御装置。 - 前記浄化装置は、前記排気管を流れる微粒子を捕集するフィルタを含み、
前記制御手段は、
前記昇温制御を、前記フィルタに捕集された微粒子量の推定値が除去要求量に到達したときに開始する
ように構成されていることを特徴とする請求項1乃至5の何れか1項に記載のエンジン制御装置。
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