JP2020118157A - プローブの作動準備ができていない場合に排気ガス成分のための触媒の貯蔵部の充填レベルを制御するための方法および制御器 - Google Patents
プローブの作動準備ができていない場合に排気ガス成分のための触媒の貯蔵部の充填レベルを制御するための方法および制御器 Download PDFInfo
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Abstract
Description
Claims (14)
- 内燃機関(10)の排気ガス中の触媒(26)の排気ガス成分貯蔵部の充填を制御する方法であって、排気ガス成分貯蔵部の実際の充填レベル(θ ̄mod)を第1のシステムモデル(100)によって決定し、触媒(26)の上流側で排気ガス流に突き出しており排気ガス成分の濃度を検出する第1の排気ガスプローブ(32)の信号(λin,meas)を、第1排気ガスプローブ(32)の作動準備ができている場合に第1システムモデル(100)に供給する、方法において、
第1の制御ループ(22、32、128、130、132)のためのラムダ目標値(λin,set)をラムダ目標値フィードフォワード制御によって設定し、第1排気ガスプローブ(32)の作動準備ができていない場合に、第1排気ガスプローブ(32)の信号の代替信号を前記システムモデル(100)に供給し、この代替信号を、ラムダ目標値(λin,set)の初期値としてラムダ目標値フィードフォワード制御に使用すること、を特徴とする方法。 - 請求項1に記載の方法において、
前記第1排気ガスプローブ(32)の信号の代替信号として、内燃機関の燃料/空気混合気組成物のフィードフォワード制御部からのラムダ信号を使用する、方法。 - 請求項1または2に記載の方法において、
前記第1の制御ループ(22、32、128、130、132)のための前記ラムダ目標値(λin,set)をラムダ目標値フィードフォワード制御によって設定し、第1システムモデル(100)と同一の第2システムモデル(100′)によってラムダ目標値のための初期値を仮想充填レベル(θ ̄set,fictious)に変換し、仮想充填レベル(θ ̄set,fictious)を目標値発生器(118,120)によって出力された目標充填レベル(θ ̄set,flt)の値と比較し、前記充填レベル目標値と前記仮想充填レベルとの間の差が所定の範囲よりも大きいことを比較結果が示した場合には、比較結果に応じてラムダ目標値を繰り返し変更し、比較結果が前記充填レベル目標値と仮想充填レベル(θ ̄set,fictious)との間に差がないことを示した場合にはラムダ目標値を変更しないように、ラムダ目標値フィードフォワード制御を設定する、方法。 - 請求項3に記載の方法において、
所定の前記目標充填レベル(θ ̄set,flt)からの実際の前記充填レベル(θ ̄mod)のずれを決定し、充填レベル制御(124)によってラムダ目標値補正値として処理し、ラムダ目標値とラムダ目標値補正値との和を形成し、該和を、前記内燃機関(10)の少なくとも1つの燃焼室(20)への燃料計量に影響を及ぼす補正値を形成するために使用する、方法。 - 請求項1から4までのいずれか1項に記載の方法において、
排気ガス成分が酸素であり、前記第1排気ガスプローブ(32)の前記信号(λin,meas)をラムダ実際値として処理するラムダ制御を第1制御ループ(22、32、128、130、132)で行い、前記ラムダ目標値(λin,set)を第2制御ループ(22、32、100、122、124、126、128、132、22)で形成し、充填レベル制御ずれを、フィルタ処理された目標充填レベル(θ ̄set,flt)の値からの、第1の触媒モデル(100)によってモデル化された充填レベルθ ̄modのずれとして形成し、この充填レベル制御ずれを、ラムダ目標値補正値を形成する充填レベル制御アルゴリズム(124)に供給し、該ラムダ目標値補正値を、必要に応じて繰り返し変更されるラムダ目標値に加算し、このようにして計算された和をラムダ目標値(λin,set)とする、方法。 - 請求項1から5までのいずれか1項に記載の方法において、
前記第1システムモデル(100)が触媒モデル(102)を含む、方法。 - 請求項6に記載の方法において、
前記触媒モデル(102)が、入力エミッションモデル(108)と、充填レベルおよびエミッションモデル(110)とを有する、方法。 - 請求項7に記載の方法において、
前記触媒モデル(102)が部分モデルを有し、これらの部分モデルをそれぞれ実際の触媒(26)の部分容積に割り当てる、方法。 - 請求項7または8に記載の方法において、
前記触媒モデル(102)が出力ラムダモデル(106)を有し、該出力ラムダモデルが、第1の触媒モデル(102)を使用して、個々の排気ガス成分の計算された濃度を、触媒の下流(26)に配置され排気ガスに露出されている第2排気ガスプローブ(34)の信号と比較可能な信号に変換するように設定された方法。 - 請求項9に記載の方法において、
前記出力ラムダモデル(106)によって計算された信号を、前記第2排気ガスプローブ(34)によって測定された信号と比較する、方法。 - 請求項9に記載の方法において、
三元触媒(26)から流出した排気ガスのためにモデル化されたラムダ値(λout,mod)が、前記排気ガス中で測定されたラムダ値(λout,meas)に対応するまで、前記システムモデル(100)のパラメータを連続的に変化させる、方法。 - 請求項3に記載の方法において、
充填レベルの目標値が、触媒(26)の最大酸素貯蔵容量の10%〜50%、特に25%〜35%である、方法。 - 制御器(16)であって、内燃機関(10)の排気ガス中の触媒(26)の排気ガス成分貯蔵部の充填を制御するように構成され、排気ガス成分貯蔵部の実際の充填レベル(θ ̄modを第1システムモデル(100)によって決定し、第1システムモデル(100)に、触媒(26)の上流側で排気ガス流に突き出しており排気ガス成分の濃度を検出する第1排気ガスプローブ(32)の信号(λin,meas)を、第1排気ガスプローブ(32)の作動準備ができている場合に処理するように構成された、制御器(16)において、
該制御器が、第1の制御ループ(22、32、128、130、132)のためのラムダ目標値をラムダ目標値フィードフォワード制御によって設定し、第1排気ガスプローブ(32)の作動準備ができていない場合に、第1排気ガスプローブ(32)の信号の代替信号を前記システムモデル(100)に供給し、基本ラムダ目標値の初期値としてラムダ目標値フィードフォワード制御に使用するように構成されたこと、を特徴とする制御器(16)。 - 請求項13に記載の制御器(16)において、
請求項2から12までのいずれか1項に記載の方法のプロセスを制御するように構成された制御器(16)。
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