JP5921178B2 - ガスセンサの故障を判定するための方法 - Google Patents
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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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Description
[0002]これらのシステムは、静止・触媒用途では十分に実証されている。アンモニアを直接使用することが一般に可能でない(または少なくとも望ましくない)移動型の用途では、尿素水溶液が、排気ガス流中での適切なアンモニア源であることが実証されている。これにより、広範囲の車両用途でSCRを使用できるようになっている。
[0021]定量供給サブシステム32は、供与量制御装置80によって生成されるNH3要求信号に応答し、注入点(node)68にNOx還元物質を送達するように構成され、このNOx還元物質は、制御された正確な供与量70(例えば単位時間当たりの質量)で排気ガス流中に導入される。一般に、還元物質(「還元剤」)は、(1)NH3ガス、または(2)所定の既知の濃度の尿素を含有する尿素水溶液でよい。見やすくするために、定量供給ユニット32はブロック形式で図示してあり、いくつかの下位要素を備えることができ、これらの下位要素は、限定はしないが、一体型ポンプまたは貯蔵タンクから尿素水溶液を加圧下で輸送する他の圧力源を含むことがある流体送達機構と、(点68での)電子制御式噴射器やノズルなど流体調整機構と、プログラムされた供与量制御ユニットとを含むことができる。定量供給サブシステム32は、当技術分野で知られている様々な形態を取ることができ、市販の構成要素を備えることができる。
[0045]ステップ315で、EMF1およびEMF2の予測値が求められる。EMF1およびEMF2の予測値の決定は、排気中のNOおよびNO2のレベルをエンジン動作状況に関係付ける所定のエンジンマッピング情報に基づくことができる。あるいは、EMF1およびEMF2の予測値は、例えば図1のセンサ40など別のセンサからの測定NOxレベルに基づいて求められることができる。さらに、EMF1およびEMF2の予測値の決定は、EMF1およびEMF2を排気中のNOおよびNO2のレベルに関係付ける所定のセンサ特性に基づくことができる。EMF1およびEMF2の予測値の決定は、ルックアップテーブル、式を利用した計算、またはそれらの組合せによって達成することができる。あるいは、EMF1およびEMF2の測定値を利用して、所定のセンサモデルに基づいてNOおよびNO2(NOx)を計算することができる。計算されたNOおよびNO2(NOx)は、所定のエンジンマッピングに基づく、またはセンサ40など別のNOxセンサを用いたNOおよびNO2(NOx)の予測値と比較することができる。
12 燃焼排気ガス
14 排気ガス処理システム
16 エンジン制御ユニット(ECU)
18 入出力部
20 排気空気質量流量(MAF)パラメータ
24 診断トラブルコード(DTC)
28 ディーゼル酸化触媒(DOC)
30 ディーゼル粒子フィルタ(DPF)
32 定量供給サブシステム
34 還元剤(例えば尿素水溶液)貯蔵タンク
36 定量供給ユニット
38 選択的触媒還元(SCR)触媒
39 DOC入口温度センサ
40 NOxセンサ
42 NOx信号
44 第1の排気ガス温度センサ
46 第1の温度信号
48 第2の排気ガス温度センサ
50 第2の温度信号
52 第1の圧力センサ
54 第1の圧力信号
56 第2の圧力センサ
58 第2の圧力信号
60 アンモニア(NH3)濃度センサ
62 アンモニア濃度信号
64 NOxセンサ
66 第2のNOx信号
68 注入点
70 供与量
80 供与量制御装置
Claims (8)
- ガス混合物にさらされるガスセンサの故障を判定するための方法であって、
前記ガス混合物中の第1のガス種の濃度と前記ガス混合物中の第2のガス種の濃度との両方に従って変化する出力を有する第1のガスセンサから第1の出力信号を受信するステップと、
前記ガス混合物中の前記第1のガス種の濃度と前記ガス混合物中の前記第2のガス種の濃度との両方に従って変化する出力を有する第2のガスセンサから第2の出力信号を受信するステップと、
前記第1のガスセンサまたは前記第2のガスセンサの故障を判定するように、前記第1の出力信号および前記第2の出力信号を、前記第1のガスセンサのモデルおよび前記第2のガスセンサのモデルを実装する診断制御装置内で処理するステップと、
判定された故障を示すステップと
を含み、
前記ガス混合物が、前記ガス混合物中にアンモニアを制御可能に導入するための手段を備える排気システムを有する内燃機関からの排気ガスを含み、前記第1のガス種がNH 3 であり、前記第2のガス種がNO x であり、
前記第1の出力信号および前記第2の出力信号の処理が、
前記ガス混合物中の前記第1のガス種の濃度を計算するように、前記第1の出力信号および前記第2の出力信号を前記モデルへの入力として使用するステップと、
前記第2のガスセンサから予測信号レベルを計算するように、計算された前記第1のガス種の前記濃度を前記第2のガスセンサの前記モデルへの入力として使用するステップと、
前記第2の出力信号が第1の所定の範囲内にない場合に、第1の故障状態を示すステップと、
前記予測信号レベルが第2の所定範囲内にない場合に、第2の故障状態を示すステップと、
前記第2の出力信号と前記予測信号レベルの差が第3の所定の範囲内にない場合に、第3の故障状態を示すステップと
を含む方法。 - 前記ガス混合物中にアンモニアを制御可能に導入するための手段が前記ガス混合物中にアンモニアを導入するように制御される時に、前記第1の出力信号および前記第2の出力信号が測定される請求項1に記載の方法。
- 前記第1の所定の範囲、前記第2の所定の範囲、および前記第3の所定の範囲のうち少なくとも1つが、前記内燃機関の動作状態の関数である請求項2に記載の方法。
- 前記第1の出力信号および前記第2の出力信号の処理が、
前記第1の出力信号が第4の所定の範囲内にない場合に、第4の故障状態を示すステップを含む請求項1に記載の方法。 - 前記ガス混合物中にアンモニアを制御可能に導入するための手段が前記ガス混合物中へのアンモニアの導入を妨げるように制御される時に、前記第1の出力信号および前記第2の出力信号が測定される請求項4に記載の方法。
- 前記第1の所定の範囲および前記第2の所定の範囲のうちの少なくとも一方が、前記内燃機関の動作状態の関数である請求項5に記載の方法。
- 判定された故障を示す前記ステップが、出力装置を制御するように動作可能な信号を発生するステップを含む請求項1に記載の方法。
- 前記出力装置が、視覚表示装置またはメモリ記憶デバイスである請求項7に記載の方法。
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US13/047,888 US9097192B2 (en) | 2011-03-15 | 2011-03-15 | Method and apparatus for identifying gas sensor faults |
US13/047,888 | 2011-03-15 |
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JP2012193729A JP2012193729A (ja) | 2012-10-11 |
JP5921178B2 true JP5921178B2 (ja) | 2016-05-24 |
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EP (1) | EP2500557B1 (ja) |
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US9482137B2 (en) * | 2011-12-01 | 2016-11-01 | Cummins Inc. | Method and algorithm for diagnosing an NH3 sensor in an SCR system using measurements from two channels of the sensor |
JP6238564B2 (ja) * | 2013-05-16 | 2017-11-29 | ボッシュ株式会社 | 診断装置、排気浄化装置、および診断方法 |
US9115630B1 (en) * | 2014-05-02 | 2015-08-25 | Cummins Inc. | Diagnostic for a mid-catalyst NH3 sensor |
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