JP2010116781A - 内燃機関の空燃比制御装置 - Google Patents
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Abstract
【解決手段】内燃機関3の空燃比制御装置1は、第1フィードバック制御アルゴリズム[式(17)〜(27)]を用いて、酸素濃度センサ22の出力値VO2が目標出力値VO2_TRGTに収束するように、吸気量を制御するとともに、第2フィードバック制御アルゴリズム[式(32)〜(42)]を用いて、酸素濃度検出手段の出力値VO2が目標出力値VO2_TRGTに収束するように、ポスト燃料噴射量Gpostを制御する。第1フィードバック制御アルゴリズムでは、出力値VO2の目標出力値VO2_TRGTへの収束速度が、第2フィードバック制御アルゴリズムにおける出力値VO2の目標出力値VO2_TRGTへの収束速度よりも遅くなるように構成されている。
【選択図】図3
Description
2 ECU(目標出力値設定手段、第1燃料量決定手段、吸気量制御手段、第2燃 料量制御手段、出力フィルタ値算出手段、吸気量可変機構制御手段、吸気量制 御入力算出手段、分配手段、新気量制御手段、不活性ガス量制御手段、第2燃 料量制御入力算出手段、第2燃料供給機構制御手段)
3 内燃機関
3a 気筒
4 燃料噴射弁(第2燃料供給機構)
6 ターボチャージャ(吸気量可変機構、新気量可変機構)
7 排気還流機構(吸気量可変機構、不活性ガス量可変機構)
9 排気通路(排気系)
10 三元触媒(排気浄化装置)
22 酸素濃度センサ(酸素濃度検出手段)
50 TWC後空燃比コントローラ(目標出力値設定手段、吸気量制御手段、第2燃 料量制御手段、出力フィルタ値算出手段、吸気量可変機構制御手段、吸気量制 御入力算出手段、分配手段、第2燃料量制御入力算出手段)
60 メインコントローラ(第1燃料量決定手段、吸気量制御手段、第2燃料量制御 手段、吸気量可変機構制御手段、新気量制御手段、不活性ガス量制御手段、第 2燃料供給機構制御手段)
Gcomb トルク燃料噴射量(第1燃料量)
Gpost ポスト燃料噴射量(第2燃料量)
VO2 酸素濃度センサの出力値(酸素濃度検出手段の出力値)
VO2_TRGT 目標出力値
VO2_IPS 出力フィルタ値
Usmc_AE AIR−EGR用補正値(吸気量制御入力)
Dgair FB新気量(新気量制御入力)
Dgegr FB・Inert−EGR量(不活性ガス量制御入力)
Dgpost FBポスト噴射量(第2燃料量制御入力)
Uadp_gp 適応則入力(補償入力成分)
λgp 忘却係数
Claims (5)
- 排ガスを浄化する排気浄化装置が排気系に設けられ、気筒内で燃焼させるための燃料が第1燃料として当該気筒内に供給されるとともに、未燃燃料が第2燃料として前記排気浄化装置に供給される内燃機関において、前記気筒への吸気量、前記第1燃料量および前記第2燃料量を制御することによって、前記排気浄化装置よりも下流側の排ガスの空燃比を制御する内燃機関の空燃比制御装置であって、
前記排気浄化装置よりも下流側に設けられ、排ガス中の酸素濃度を表す検出信号を出力する酸素濃度検出手段と、
前記酸素濃度検出手段の出力値の目標となる目標出力値を設定する目標出力値設定手段と、
前記第1燃料量を決定する第1燃料量決定手段と、
前記決定された第1燃料量および所定の第1フィードバック制御アルゴリズムを用いて、前記酸素濃度検出手段の前記出力値が前記目標出力値に収束するように、前記吸気量を制御する吸気量制御手段と、
前記決定された第1燃料量および所定の第2フィードバック制御アルゴリズムを用いて、前記酸素濃度検出手段の前記出力値が前記目標出力値に収束するように、前記第2燃料量を制御する第2燃料量制御手段と、
を備え、
前記第1フィードバック制御アルゴリズムでは、前記出力値の前記目標出力値への収束速度が、前記第2フィードバック制御アルゴリズムにおける前記出力値の前記目標出力値への収束速度よりも遅くなるように構成されていることを特徴とする内燃機関の空燃比制御装置。 - 前記内燃機関は、前記吸気量を変更可能な吸気量可変機構を備えており、
前記吸気量制御手段は、
前記酸素濃度検出手段の前記出力値に所定のフィルタ処理を施すことにより、出力フィルタ値を算出する出力フィルタ値算出手段と、
当該出力フィルタ値が前記目標出力値に収束するように、前記吸気量可変機構を制御する吸気量可変機構制御手段と、
を有し、
前記フィルタ値算出手段は、前記出力フィルタ値を、前記出力値の状態に応じて、前記出力値の所定周波数以上の高周波成分が遮断された状態、または前記出力値に対して位相遅れのない状態で算出することを特徴とする請求項1に記載の内燃機関の空燃比制御装置。 - 前記出力フィルタ値算出手段は、前記出力フィルタ値を、前記出力値の変動量の絶対値が所定値以下のときに、前記出力値の前記所定周波数以上の高周波成分が遮断された状態で算出し、前記出力値の前記変動量の絶対値が前記所定値を超えたときに、前記出力値に対して位相遅れのない状態で算出することを特徴とする請求項2に記載の内燃機関の空燃比制御装置。
- 前記内燃機関は、前記気筒内に吸入される新気量を変更可能な新気量可変機構と、前記前記気筒内に吸入される不活性ガス量を変更可能な不活性ガス量可変機構と、を備えており、
前記吸気量制御手段は、
前記第1フィードバック制御アルゴリズムを用いて、前記酸素濃度検出手段の前記出力値が前記目標出力値に収束するように、前記吸気量を制御するための吸気量制御入力を算出する吸気量制御入力算出手段と、
当該吸気量制御入力を、前記新気量を制御するための新気量制御入力と、前記不活性ガス量を制御するための不活性ガス量制御入力とに分配する分配手段と、
当該新気量制御入力を用いて、前記新気量可変機構を制御する新気量制御手段と、
前記不活性ガス量制御入力を用いて、前記不活性ガス量可変機構を制御する不活性ガス量制御手段と、
を有することを特徴とする請求項1に記載の内燃機関の空燃比制御装置。 - 前記内燃機関は、前記第2燃料を前記排気浄化装置に供給する第2燃料供給機構を備えており、
前記第2燃料量制御手段は、
所定の第2フィードバック制御アルゴリズムを用いて、前記酸素濃度検出手段の前記出力値が前記目標出力値に収束するように、前記第2燃料量を制御するための第2燃料量制御入力を算出する第2燃料量制御入力算出手段と、
当該第2燃料量制御入力を用いて、前記第2燃料供給機構を制御する第2燃料供給機構制御手段と、を有しており、
前記第2燃料量制御入力算出手段は、前記第2燃料量制御入力を、前記酸素濃度検出手段の前記出力値と前記目標出力値との間の定常偏差を補償するための補償入力成分を含むように算出するとともに、当該補償入力成分を所定の忘却処理を施しながら算出することを特徴とする請求項1に記載の内燃機関の空燃比制御装置。
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JP2008288379A JP4654287B2 (ja) | 2008-11-11 | 2008-11-11 | 内燃機関の空燃比制御装置 |
EP09175059A EP2184469A3 (en) | 2008-11-11 | 2009-11-04 | Air-fuel ratio control system and method for internal combustion engine |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012020509A1 (ja) * | 2010-08-10 | 2012-02-16 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2013108421A (ja) * | 2011-11-18 | 2013-06-06 | Mitsubishi Motors Corp | エンジンの排気浄化装置 |
JP2015132198A (ja) * | 2014-01-10 | 2015-07-23 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
DE112014006704B4 (de) * | 2014-05-28 | 2021-06-10 | Delphi Technologies Ip Limited | Abgasreinigungssystem für einen Verbrennungsmotor |
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JP6259596B2 (ja) * | 2013-07-11 | 2018-01-10 | ヤンマー株式会社 | 排気ガス浄化装置 |
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JP3373724B2 (ja) | 1996-04-05 | 2003-02-04 | 本田技研工業株式会社 | 内燃機関の空燃比制御装置 |
DE60019514T2 (de) * | 1999-08-16 | 2005-08-18 | Mazda Motor Corp. | Verfahren und Vorrichtung zur Steuerung einer Dieselbrennkraftmaschine |
JP3957180B2 (ja) * | 2002-08-09 | 2007-08-15 | 本田技研工業株式会社 | デシメーションフィルタを用いた内燃機関の空燃比制御装置 |
DE102006020675A1 (de) * | 2006-05-04 | 2007-11-08 | Volkswagen Ag | Verfahren zur Lambda- und Momentenregelung einer Verbrennungskraftmaschine sowie Programmalgorithmus |
EP1887202B1 (en) * | 2006-08-01 | 2009-07-29 | Honda Motor Co., Ltd. | Sulfur purge control device for an internal combustion engine |
JP4845762B2 (ja) * | 2007-02-13 | 2011-12-28 | 本田技研工業株式会社 | 内燃機関の排ガス浄化装置 |
JP4724217B2 (ja) * | 2008-10-14 | 2011-07-13 | 本田技研工業株式会社 | 内燃機関の制御装置 |
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JPH02252943A (ja) * | 1989-03-27 | 1990-10-11 | Mazda Motor Corp | エンジンのアイドル回転数制御装置 |
JP2000345888A (ja) * | 1999-06-03 | 2000-12-12 | Toyota Motor Corp | 内燃機関の回転数制御装置 |
JP2004150280A (ja) * | 2002-10-28 | 2004-05-27 | Honda Motor Co Ltd | εフィルタを用いて信号を平滑化する装置 |
JP2008128174A (ja) * | 2006-11-24 | 2008-06-05 | Denso Corp | 内燃機関の制御装置 |
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WO2012020509A1 (ja) * | 2010-08-10 | 2012-02-16 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP5556891B2 (ja) * | 2010-08-10 | 2014-07-23 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2013108421A (ja) * | 2011-11-18 | 2013-06-06 | Mitsubishi Motors Corp | エンジンの排気浄化装置 |
JP2015132198A (ja) * | 2014-01-10 | 2015-07-23 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
DE112014006704B4 (de) * | 2014-05-28 | 2021-06-10 | Delphi Technologies Ip Limited | Abgasreinigungssystem für einen Verbrennungsmotor |
Also Published As
Publication number | Publication date |
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EP2184469A2 (en) | 2010-05-12 |
EP2184469A3 (en) | 2010-06-02 |
JP4654287B2 (ja) | 2011-03-16 |
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