JP5946269B2 - 内部および外部の排ガスリサーキュレーションを有するnoxコントローラー - Google Patents
内部および外部の排ガスリサーキュレーションを有するnoxコントローラー Download PDFInfo
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- JP5946269B2 JP5946269B2 JP2011283995A JP2011283995A JP5946269B2 JP 5946269 B2 JP5946269 B2 JP 5946269B2 JP 2011283995 A JP2011283995 A JP 2011283995A JP 2011283995 A JP2011283995 A JP 2011283995A JP 5946269 B2 JP5946269 B2 JP 5946269B2
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Description
・ 排ガスの第一の部分は、内部の排ガスリサーキュレーションとして、ディーゼルエンジンの燃焼室から、燃焼室に付設されたアウトレットバルブを介して、後続する排ガス経路へと排出され、そして再びアウトレットバルブを介して後続する排ガス経路からディーゼルエンジンの燃焼室へと戻され、
・ 排ガスの第二の部分は、燃焼室内にとどまり、押し出されず、
・ 排ガスの第三の部分は、外部の排ガスリサーキュレーションとして、アウトレットバルブから排出された後に、排ガスリサーキュレーションバルブを介して燃焼室に戻され、および、
・ 排ガスの各部分は、燃焼行程のために燃焼室内における残留排ガスを共に形成し、
その際、残留排ガス、及び/又は、燃焼室内の排ガスの部分の間の少なくとも比率が調節されることが提案される。
2 圧縮装置
3 コンプレッサー
4 排ガスタービン
5 低圧排ガスリサーキュレーション
6 高圧排ガスリサーキュレーション
7 外部の排ガスリサーキュレーション
8 排ガスリサーキュレーションバルブ
9 エンジン制御部
10 数値演算ユニット
11 バルブ制御装置
12 冷却部
13 新気供給部
14 排ガス経路
15 排ガス浄化装置
16 残留排ガスの圧力および温度を決定するための装置
17 センサー
18 燃焼室
19 残留排ガス
20 第一の部分
21 アウトレットバルブ
22 第二の部分
23 第三の部分
Claims (16)
- ディーゼルエンジンにおいて窒素酸化物排出物を減少するための方法であって、この方法において少なくとも、燃焼室(10)内のエンジン内燃焼の排ガスが、以下のように分割される、つまり、
・ 排ガスの第一の部分(20)は、内部の排ガスリサーキュレーションとして、ディーゼルエンジンの燃焼室から、燃焼室(18)に付設されたアウトレットバルブ(21)を介して、後続する排ガス経路(14)へと排出され、そして再びアウトレットバルブ(21)を介して後続する排ガス経路(14)からディーゼルエンジン(1)の燃焼室(18)へと戻され、
・ 排ガスの第二の部分(22)は、燃焼室(18)内にとどまり、押し出されず、
・ 排ガスの第三の部分(23)は、外部の排ガスリサーキュレーションとして、排ガスリサーキュレーションバルブ(8)を介して燃焼室(18)に戻され、および、
・ 排ガスの各部分(20,22,23)は、燃焼行程のための燃焼室内における残留排ガス(19)を共に形成し、
その際、残留排ガス(19)の温度及び/又は圧力、及び/又は、少なくとも燃焼室(18)内の排ガスの部分(20,22,23)の間の比率が調節され、
その際、吸入された、燃焼室(18)に対して求められた新気の第一の温度と、残留排ガス(19)の第二の温度が求められ、および数値演算ユニット(10)、点火遅れを計算するためのモデルを使用して、および少なくとも第一および第二の温度を考慮して、シリンダー充填温度が計算されることを特徴とする方法。 - ディーゼルエンジン(1)の運転中に、方法ステップ中において、燃焼室(18)内の残留排ガス(19)の温度及び圧力を含む、少なくとも一つの物理量が検出され、別の方法ステップ中において、残留排ガス(19)の密度および残留排ガス(19)の質量が計算されるか、または始動過程において予め定められることを特徴とする請求項1に記載の方法。
- 計算されたか、または予め定められた残留排ガス(19)の質量を使用して、燃焼室(18)内の酸素濃度が調節され、又は調整されることを特徴とする請求項1または2に記載の方法。
- 計算されたシリンダー充填温度を介して、残留排ガス(19)の第一の部分(20)および第三の部分(23)の比率の分配が推量されることを特徴とする請求項1から3のいずれか一項に記載の方法。
- 残留排ガス(19)の少なくとも一または複数の部分(20,22,23)の温度及び/又は圧力、及び/又は、残留排ガス(19)の部分(20,22,23)の一または複数の比率が、互いに目標値としてコントロール部内で予め定められることを特徴とする請求項1から4いずれか一項に記載の方法。
- 残留排ガス(19)の第一の部分(20)、及び/又は、残留排ガスの第三の部分(23)の比率が、調整されることを特徴とする請求項1から5いずれか一項に記載の方法。
- 算出された燃焼室(18)内の点火遅れを介して、最大点火遅れ期間に属する最少の圧縮終了温度が計算され、および最少の圧縮終了温度を達成するために、最少の圧縮終了温度を使って最少のシリンダー充填温度が計算されることを特徴とする請求項1から6のいずれか一項に記載の方法。
- 最少の圧縮終了温度を達成するために、燃焼室内の残留排ガスの第一の部分(20)及び/又は第二の部分(22)の比率が調整されることを特徴とする請求項7に記載の方法。
- 少なくとも温度及び/又は圧力を含む、一つの物理量が、点火遅れを計算するためにある時点に対して検出され、これに対してエンジンのアウトレットバルブ(21)が閉じられ、そして検出された点火遅れが残留排ガス及び/又は残留ガスの部分の密度及び質量の計算へと取り入れられることを特徴とする請求項2から8のいずれか一項に記載の方法。
- 少なくとも、燃焼室に供給される新気の温度及び/又は圧力が、センサー(17)を使って、存在するデータ及び/又は計算されたデータを使って求められることを特徴とする請求項1から9のいずれか一項に記載の方法。
- 少なくとも、残留排ガス(19)の温度及び/又は圧力、及び/又は、少なくとも残留排ガス(19)の一つの部分(20,22,23)の比率が、センサー(17)を使って、存在するデータ及び/又は計算されたデータを使って、求められることを特徴とする請求項1から10のいずれか一項に記載の方法。
- 可変バルブ制御を使って、残留排ガス(19)の第一の部分(20)の比率が、燃焼室(18)内のシリンダー充填温度を考慮して、少なくとも制御されることを特徴とする請求項1から11のいずれか一項に記載の方法。
- 残留排ガス(19)の部分(20,22,23)の互いの比率、及び/又は、残留排ガス(19)の部分(20,22,23)の温度及び/又は圧力が、シリンダーの幾何データの助けを借りて検出されることを特徴とする請求項1から12のいずれか一項に記載の方法。
- ディーゼルエンジン(1)を含む、内燃機関であって、請求項1から13のいずれか一項に記載の方法を組み込まれており、各燃焼室のための新気供給部(13)、内部の排ガスリサーキュレーションを実行するための少なくとも一つの可変バルブ駆動部、少なくとも一つの排ガスリサーキュレーションバルブ(8)、少なくとも一つの、残留排ガス(19)及び/又はその部分(20,22,23)の温度および圧力を求めるための装置(16)、および数値演算ユニット(10)を有する内燃機関において、
数値演算ユニット(10)が、少なくとも、点火遅れを計算し、および残留排ガス及び/又はその部分(20,22,23)の密度及び質量を求めるためのモデルを有し、および、算出された戻される排ガスの質量を基に、各燃焼室のための新気供給部を求める又は調整を行うコントロール部を有することを特徴とする内燃機関。 - 外部の排ガスリサーキュレーション(7)が設けられており、この排ガスリサーキュレーションが、低圧および高圧排ガスリサーキュレーション(5,6)を含むことを特徴とする請求項14に記載の内燃機関。
- 外部の排ガスリサーキュレーション(7)が、冷却部を備えることを特徴とする請求項14または15に記載の内燃機関。
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