JP6257941B2 - ディーゼルエンジン排ガス中の窒素酸化物を減少させる方法 - Google Patents
ディーゼルエンジン排ガス中の窒素酸化物を減少させる方法 Download PDFInfo
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
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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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- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
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- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
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Description
(1)浄化すべき排ガス中へ還元剤としてアンモニアおよび/またはアンモニアに分解する化合物を添加するための装置;
(2)第1のSCRユニットを形成する1つまたは複数のSCR触媒;
(3)上記第1のSCRユニットの後方の、排ガス中のアンモニア濃度を求めるためのアンモニアセンサ;
(4)上記第2のSCRユニットを形成する1つまたは複数のSCR触媒および/またはアンモニア酸化触媒;
(5)排ガスエンドパイプ中の窒素酸化物(NOx)の濃度を求めるための窒素酸化物センサ(NOxセンサ);
を上記順序で有する排ガス後処理システムを用いてディーゼルエンジン排ガス中の窒素酸化物を減少させる方法によって解決される。
本発明方法では、排ガス中に添加すべきアンモニアおよび/またはアンモニアに分解する化合物の量を、上記アンモニアセンサによって求めた第1のSCRユニット後方の排ガス中のアンモニア濃度と、上記NOxセンサで求めた排ガスエンドパイプ中の窒素酸化物濃度とを用いて調節する。本発明方法は、上記アンモニアセンサと上記NOxセンサのセンサ信号から、バーチャルNOx/NH3センサの実際値を計算し、それをPI制御器またはPID制御器のための入力量として用い、上記制御器では実際値と所定の目標値とを比較して上記アンモニアおよび/またはアンモニアに分解する化合物の添加量を定めることを特徴とする。
Claims (7)
- 排ガス後処理システムを用いてディーゼルエンジン排ガス中の窒素酸化物を減少させる方法であって、
排ガスの流れ方向に下記(1)〜(5)を下記の順序で有し:
(1)浄化すべき排ガス中へ還元剤としてアンモニアおよび/またはアンモニアに分解する化合物を添加するための装置;
(2)第1のSCRユニットを形成する1つまたは複数のSCR触媒;
(3)上記第1のSCRユニットの後方の、排ガス中のアンモニア濃度を求めるためのアンモニアセンサ;
(4)第2のSCRユニットを形成する1つまたは複数のSCR触媒および/またはアンモニア酸化触媒;
(5)排ガスエンドパイプ中の窒素酸化物(NOx)の濃度を求めるための窒素酸化物センサ(NOxセンサ);
排ガス中に添加すべきアンモニアおよび/またはアンモニアに分解する化合物の量を、上記アンモニアセンサによって求めた第1のSCRユニット後方の排ガス中のアンモニア濃度と、上記NOxセンサで求めた排ガスエンドパイプ中の窒素酸化物濃度とを用いて調節し、
上記アンモニアセンサと上記NOxセンサのセンサ信号から、バーチャルNOx/NH3センサの実際値を計算し、それをPI制御器またはPID制御器のための入力量として用い、この制御器では実際値と所定の目標値とを比較して上記アンモニアおよび/またはアンモニアに分解する化合物の添加量を定め、
アンモニアおよび/またはアンモニアに分解する化合物の上記添加量を排ガス中へ供給し、
上記の所定の目標値は第1のSCRユニットの排ガスの空間速度および第1のSCRユニットのSCRユニットの平均温度の関数であり、
上記バーチャルNO x /NH 3 センサの実際値の計算を下記1)〜3)の手順で行うことを特徴とする方法:
1)NO x センサ信号をNH 3 センサ信号で補正して排ガスエンドパイプ中の実際のNO x 濃度を表す補正されたNOx値NOxCorDSを計算し、この値NOxCorDSはゼロより小さくなく、
2)値NOxCorDSに(−1)で乗算して[−NOxCorDS]とし;
3)マップから所定の重み付け係数を乗算して値[−NOxCorDS]を重み付けし、上記重み付け係数は0と1の間の値をとり、
第1のSCRユニット後方の排ガス中のアンモニアセンサが所定の第1の最大許容値を上回らないアンモニア濃度を検出している間は上記の重み付け係数は1であり、この第1の最大許容値は、浄化すべき排ガス中のアンモニアがエンジンのすべての運動点において第2のSCRユニット中で完全に窒素に変換できるように選択され、
アンモニアセンサによって検出された第1のSCRユニット後方の排ガス中のアンモニア濃度が所定の第2の最大許容値に達するか、それを上回った場合には上記の重み付け係数が0とする。 - 第1のSCRユニット後方の排ガス中のアンモニアの最大許容濃度を目標値として設定し、この目標値はゼロより大きい請求項1に記載の方法。
- 上記目標値が第1のSCRユニットおよび第2のSCRユニットに対する排ガスの空間速度と、第1のSCRユニットおよび第2のSCRユニットの平均温度の関数である請求項1または2に記載の方法。
- PI制御器またはPID制御器用の他の入力量として、比例成分と、積分成分と、アンモニアおよび/またはアンモニアに分解する化合物の最大可能添加量とを設定し、これら他の入力量が第1のSCRユニット、および第2のSCRユニットに対する排ガスの空間速度と、第1のSCRユニットおよび第2のSCRユニットの平均温度との関数である請求項1〜3のいずれか一項に記載の方法。
- 目標値と実際値との差が所定の閾値を上回るか、下回った場合に、上記の比例成分および積分成分にパラメータ化可能な増幅係数を乗算して目標値への制御を促進する請求項4に記載の方法。
- 下記(1)〜(5):
(1)浄化すべき排ガス中へ還元剤としてアンモニアおよび/またはアンモニアに分解する化合物を添加するための装置;
(2)第1のSCRユニットを形成する1つまたは複数のSCR触媒;
(3)上記第1のSCRユニットの後方の、排ガス中のアンモニア濃度を求めるためのアンモニアセンサ;
(4)第2のSCRユニットを形成する1つまたは複数のSCR触媒および/またはアンモニア酸化触媒;
(5)排ガスエンドパイプ中の窒素酸化物(NO x )の濃度を求めるための窒素酸化物センサ(NO x センサ);
を下記の順序で有し、
排ガス中に添加すべきアンモニアおよび/またはアンモニアに分解する化合物の量が、上記アンモニアセンサによって求めた第1のSCRユニット後方の排ガス中のアンモニア濃度と、上記NO x センサで求めた排ガスエンドパイプ中の窒素酸化物濃度とを用いて調節され、
上記アンモニアセンサと上記NO x センサのセンサ信号から、バーチャルNO x /NH 3 センサの実際値を計算し、それをPI制御器またはPID制御器のための入力量として用い、この制御器では実際値と所定の目標値とを比較して上記アンモニアおよび/またはアンモニアに分解する化合物の添加量を定め、上記の所定の目標値は第1のSCRユニットの排ガスの空間速度および第1のSCRユニットのSCRユニットの平均温度の関数である、
ことを特徴とする請求項1〜5のいずれか一項に記載の方法を実施するための排ガス後処理システム。 - ディーゼルエンジンと、請求項6に記載の排ガス後処理システムとを有する車両または装置。
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EP12005203.0A EP2684597A1 (de) | 2012-07-14 | 2012-07-14 | Verfahren zur Verminderung von Stickoxiden aus Dieselmotorenabgasen |
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US20140020364A1 (en) | 2014-01-23 |
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