JP6316471B1 - エンジン制御装置およびエンジン制御方法 - Google Patents
エンジン制御装置およびエンジン制御方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 52
- 239000000446 fuel Substances 0.000 claims abstract description 356
- 239000001301 oxygen Substances 0.000 claims abstract description 284
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 284
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 281
- 238000012937 correction Methods 0.000 claims abstract description 147
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 37
- 239000007789 gas Substances 0.000 claims description 20
- 230000004044 response Effects 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 description 30
- 230000008859 change Effects 0.000 description 16
- 230000007423 decrease Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
特許文献2のように、推定した酸素センサ温度に基づいて測定空燃比を補正するには、測定空燃比が実空燃比となるように補正係数を持つ必要がある。しかしながら、酸素センサ出力電圧と空燃比の関係は、線形ではない。このため、補正係数を求める処理が複雑化するおそれがあった。
図1は、本発明の実施の形態1に係るエンジン制御装置がエンジンに取り付けられた状態を示す構成図である。図1において、コントロールユニット1は、エンジン制御装置の主要部を構成するCPUおよびメモリを含むマイクロコンピュータからなる。そして、このコントロールユニット1は、エンジン19の全体の動作を制御するためのプログラムやマップデータを格納している。
[条件1]空燃比フィードバック制御条件が成立した初回か否か。
[条件2]空燃比フィードバック制御条件成立前にリーン状態が一定時間継続しているか否か。
[条件1]空燃比フィードバック制御条件が成立した初回か否か。
[条件3]空燃比フィードバック制御条件成立前にリッチ状態が一定時間継続しているか否か。
Kgain_tgt=Kgain_tgt×Kgain_et
を算出し、その次に、エンジン回転速度の変動量が判定値以上であると判定された場合には、
Kgain_tgt=Kgain_tgt×Kgain_acc
を算出し、最後に、燃料カット中であると判断された場合には、
Kgain_tgt=Kgain_tgt×Kgain_fc
を算出し、目標酸素センサ電圧補正係数Kgain_tgtを求めてもよい。
Kgain=Kgain_1st×Kgain_nml
として算出し、図8のステップS20へ進む。
VAFtmp=(VAF−0.45)×Kgain+0.45[V]
として算出し、ステップS23へ進む。
VAFtmp=0.45−(0.45−VAF)×Kgain[V]
として算出し、ステップS23へ進む。
SGi(n)=SGi(n−1)+Gi
として行い、ステップS27に進む。
Kfb=1.0+Gp+SGi
として演算し、一連処理を終了する。
Claims (15)
- エンジン温度、エンジン回転速度、スロットル開度を含むエンジンの運転状態情報を検出する各種センサと、
前記エンジンの排ガス中の酸素濃度に感応して出力電圧値が変化する酸素センサと、
前記運転状態情報および前記出力電圧値に基づいて前記エンジンへの燃料噴射量を調整する空燃比フィードバック制御手段と
を備えたエンジン制御装置であって、
前記空燃比フィードバック制御手段は、直接的に酸素センサ温度を推定して求めることなしに、前記各種センサの検出結果に基づく前記運転状態情報に応じて前記出力電圧値を補正するための係数である酸素センサ出力電圧補正係数を算出し、前記酸素センサ出力電圧補正係数による補正後の酸素センサ出力電圧値を用いて算出した空燃比フィードバック制御補正量に基づいて空燃比フィードバック制御を実施し、前記エンジンへの燃料噴射量を調整する
エンジン制御装置。 - 前記空燃比フィードバック制御手段は、
前記運転状態情報に応じて前記酸素センサ出力電圧補正係数を算出する補正係数算出手段と、
前記酸素センサ出力電圧補正係数を基に前記補正後の酸素センサ出力電圧値を算出する出力電圧補正手段と、
前記補正後の酸素センサ出力電圧値に基づいて比例ゲインを決定する比例ゲイン演算手段と、
前記補正後の酸素センサ出力電圧値に基づいて積分ゲインを決定する積分ゲイン演算手段と、
前記比例ゲインと前記積分ゲインに基づいて、前記空燃比フィードバック制御補正量を決定する補正量演算手段と
を有する
請求項1に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報に基づき、車両の運転状態がエンジン始動直後であると判断した場合には、エンジン始動直後用の酸素センサ出力電圧補正係数を算出する
請求項2に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報に基づき、車両の運転状態が加速中であると判断した場合には、加速用の酸素センサ出力電圧補正係数を算出する
請求項2または3に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報に基づき、車両の運転状態が減速中であると判断した場合には、減速用の酸素センサ出力電圧補正係数を算出する
請求項2から4のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報に基づき、車両の運転状態が燃料カット中であると判断した場合には、燃料カット時用の酸素センサ出力電圧補正係数を算出する
請求項2から5のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報から取得したエンジン温度に応じて、前記酸素センサ出力電圧補正係数を算出する
請求項2から6のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報から取得したエンジン回転速度よりエンジン回転速度の変動量を算出し、前記エンジン回転速度の変動量があらかじめ設定した判定値よりも大きいと判断した場合には、エンジン回転変動時用の酸素センサ出力電圧補正係数を算出する
請求項2から7のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報から取得した吸入空気量と前記エンジン回転速度によって決まる運転領域に応じて前記酸素センサ出力電圧補正係数を算出する
請求項2から8のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記酸素センサが活性化しているか否かの判定を行い、活性化していると判定した場合には、酸素センサ活性化判定時用の酸素センサ出力電圧補正係数を算出する
請求項2から9のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、空燃比フィードバック制御開始前に、前記酸素センサの電圧に応じて、実際の排気管内の空燃比である実空燃比がリッチであるかリーンであるかの判定を行い、前記実空燃比がリーンである状態が一定時間継続したと判断した場合には、空燃比フィードバック制御開始前リーン用の酸素センサ出力電圧補正係数を算出する
請求項2から10のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、空燃比フィードバック制御開始前に、前記酸素センサの電圧に応じて、実際の排気管内の空燃比である実空燃比がリッチであるかリーンであるかの判定を行い、前記実空燃比がリッチである状態が一定時間継続したと判断した場合には、空燃比フィードバック制御開始前リッチ用の酸素センサ出力電圧補正係数を算出する
請求項2から11のいずれか1項に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報から取得したスロットル開度から前記吸入空気量を求める
請求項9に記載のエンジン制御装置。 - 前記補正係数算出手段は、前記運転状態情報から取得した吸気圧から前記吸入空気量を求める
請求項9に記載のエンジン制御装置。 - エンジン温度、エンジン回転速度、スロットル開度を含むエンジンの運転状態情報を検出する各種センサと、
前記エンジンの排ガス中の酸素濃度に感応して出力電圧値が変化する酸素センサと、
前記運転状態情報および前記出力電圧値に基づいて前記エンジンへの燃料噴射量を調整する空燃比フィードバック制御手段と
を備えたエンジン制御装置において、前記空燃比フィードバック制御手段により実行されるエンジン制御方法であって、
直接的に酸素センサ温度を推定して求めることなしに、前記各種センサの検出結果に基づく前記運転状態情報に応じて前記出力電圧値を補正するための係数である酸素センサ出力電圧補正係数を算出する第1ステップと、
前記酸素センサ出力電圧補正係数による補正後の酸素センサ出力電圧値を用いて空燃比フィードバック制御補正量を算出する第2ステップと、
前記空燃比フィードバック制御補正量に基づいて空燃比フィードバック制御を実施し、前記エンジンへの燃料噴射量を調整する第3ステップと
を有するエンジン制御方法。
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