JP2009243463A - エンジン制御装置 - Google Patents
エンジン制御装置 Download PDFInfo
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Abstract
【解決手段】クランクシャフトの角加速度とその慣性モーメントとに基づいて算出されたベース値T_bに、トーショナルダンパの捻れ角度Δθとそのばね係数K_dampの乗算値として求められた弾性補正値による補正を行ってエンジントルクT_qを算出することとした。そのため、トーショナルダンパの捻れによるトルクの吸収分を見込んでのエンジントルクT_qの算出が可能となる。
【選択図】図2
Description
上記課題を解決するため、請求項1に記載の発明では、クランクシャフトの回転をトーショナルダンパを介して出力するエンジンの制御を行う装置であって、前記クランクシャフトの角加速度とその慣性モーメントとに基づいてエンジントルクを算出する算出手段と、前記トーショナルダンパの捻れ角度に基づいて算出した補正値にて前記エンジントルクの算出値を補正する補正手段と、を備えることをその要旨としている。
請求項12に記載の発明は、請求項9〜11のいずれか1項に記載のエンジン制御装置において、前記判定手段の判定結果に基づいて前記エンジンの燃焼状態が良好に維持されるようにエンジン制御量をフィードバック制御するフィードバック制御手段を備えることをその要旨としている。
(1)本実施形態では、クランクシャフト11の角加速度とその慣性モーメントとに基づくエンジントルクT_qの算出に際して、トーショナルダンパ14の捻れ角度に基づいて算出した弾性補正値T_eにてエンジントルクの算出値を補正するようにしている。より具体的には、上記弾性補正値T_eを、トーショナルダンパ14の捻れ角度Δθ及びそのばね係数K_damp の乗算値として算出して補正を行っている。されてなることをその要旨としている。トーショナルダンパ14の捻れ角度Δθからは、その捻れにより吸収された分のエンジントルクの大きさを求めることができる。ここでトーショナルダンパ14を単純なばね要素と見做せば、その捻れにより吸収されたトルクの大きさは、トーショナルダンパ14の捻れ角度Δθとそのばね係数K_damp との乗算値となる。そのため、上記の如く算出された弾性補正値T_eによる補正を行えば、トーショナルダンパ14の捻れにより吸収された分のトルクも見込んでエンジントルクの算出を行うことができるようになる。したがって、低剛性のトーショナルダンパ14がクランクシャフト11に連結されていても、クランクシャフト11の角速度情報に基づくエンジントルクの算出を精度良く行い、ひいてはその算出結果に基づくエンジン制御をより好適に行うことができるようになる。
なお上記実施の形態は、以下のように変更して実施することもできる。
トーショナルダンパ14の減衰係数がある程度よりも大きいときには、トーショナルダンパ14のトルク吸収量を求める際に、トーショナルダンパ14のばね要素としての側面だけでなく、減衰要素としての側面も無視できないことになる。そこで、そうした場合には、次式(3)を用いてエンジントルクT_qを算出するようにすると良い。
・上記実施の形態では、機関冷却水温及び機関回転速度に基づき算出された摩擦補正値T_fによる補正を行ってエンジントルクT_qの算出を行っていた。機関冷却水温や機関回転速度によるフリクショントルクの変化が十分に小さいのであれば、摩擦補正値T_fを定数としてエンジントルクT_qの算出を行うようにしても良い。またフリクショントルクが無視し得るほど小さいのであれば、エンジントルクT_qの算出に際しての摩擦補正値T_fによる補正を省略するようにしても良い。
Claims (18)
- クランクシャフトの回転をトーショナルダンパを介して出力するエンジンの制御を行う装置であって、
前記クランクシャフトの角加速度とその慣性モーメントとに基づいてエンジントルクを算出する算出手段と、
前記トーショナルダンパの捻れ角度に基づいて算出した補正値にて前記エンジントルクの算出値を補正する補正手段と、
を備えることを特徴とするエンジン制御装置。 - 前記補正値は、前記捻れ角度及び前記トーショナルダンパのばね係数の乗算値として算出されてなる
請求項1に記載のエンジン制御装置。 - 前記補正値は、前記捻れ角度及び前記トーショナルダンパのばね係数の乗算値と、前記トーショナルダンパの前後の角速度の差及び同トーショナルダンパの減衰係数の乗算値との2つの乗算値の和として算出されてなる
請求項1に記載のエンジン制御装置。 - 前記補正手段による補正後の前記エンジントルクの算出値の規定時間の平均値から前記エンジントルクの特定周波数成分を抽出する抽出手段を備える
請求項1〜3のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段は、2つの異なる規定時間についての前記平均値をそれぞれ算出するとともに、それら2つの平均値の差から前記エンジントルクの特定周波数成分を抽出する
請求項4に記載のエンジン制御装置。 - 規定機関回転速度における前記補正手段による補正後の前記エンジントルクの算出値の規定燃焼回数分の平均値から前記エンジントルクの特定周波数成分を抽出する抽出手段を備える
請求項1〜4のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段は、2つの異なる燃焼回数についての前記平均値をそれぞれ算出するとともに、それら2つの平均値の差から前記エンジントルクの特定周波数成分を抽出する
請求項6に記載のエンジン制御装置。 - 前記補正手段による補正後の前記エンジントルクの算出値にデジタルフィルタ処理を施して前記エンジントルクの特定周波数成分を抽出する抽出手段を備える
請求項1〜3のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段の抽出した前記エンジントルクの特定周波数成分の大きさに基づいて前記エンジンの燃焼状態の良否を判定する判定手段を備える
請求項4〜8のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段の抽出した前記エンジントルクの特定周波数成分の大きさの分布に基づいて前記エンジンの燃焼状態の良否を判定する判定手段を備える
請求項4〜8のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段の抽出した前記エンジントルクの特定周波数成分の大きさの平均値に基づいて前記エンジンの燃焼状態の良否を判定する判定手段を備える
請求項4〜8のいずれか1項に記載のエンジン制御装置。 - 前記判定手段の判定結果に基づいて前記エンジンの燃焼状態が良好に維持されるようにエンジン制御量をフィードバック制御するフィードバック制御手段を備える
請求項9〜11のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段は、前記エンジントルクの特定周波数成分の抽出を前記エンジンの気筒別に行なう
請求項4〜8のいずれか1項に記載のエンジン制御装置。 - 前記抽出手段が気筒別に抽出した前記エンジントルクの特定周波数成分の大きさに基づいて前記エンジンの各気筒の燃焼状態の良否を個別に判定する判定手段を備える
請求項13に記載のエンジン制御装置。 - 前記抽出手段が気筒別に抽出した前記エンジントルクの特定周波数成分の大きさの分布に基づいて前記エンジンの各気筒の燃焼状態の良否を個別に判定する判定手段を備える
請求項13に記載のエンジン制御装置。 - 前記抽出手段が気筒別に抽出した前記エンジントルクの特定周波数成分の大きさの平均値に基づいて前記エンジンの各気筒の燃焼状態の良否を個別に判定する判定手段を備える
請求項13に記載のエンジン制御装置。 - 前記判定手段の判定結果に基づいて各気筒の燃焼状態が良好に維持されるようにエンジン制御量を気筒毎に個別にフィードバック制御するフィードバック制御手段を備える
請求項14〜16のいずれか1項に記載のエンジン制御装置。 - 前記クランクシャフトは、前記トーショナルダンパを介して電動機の回転子に連結されてなる
請求項1〜17のいずれか1項に記載のエンジン制御装置。
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