JP2012062883A - 内燃機関用制御装置、および内燃機関用制御方法 - Google Patents
内燃機関用制御装置、および内燃機関用制御方法 Download PDFInfo
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Abstract
【解決手段】内燃機関2は吸気通路3および排気通路4を有し、排気通路4から吸気通路3に濾過済排気6を戻すための濾過済排気還流装置5を有する。吸気通路3の第2の区間32には、新気8と還流した濾過済排気23との混合気体が流れる。装置は、濾過済排気還流装置5によって還流した濾過済排気23の流量の調節によって、吸気通路3の第2の区間32の中の酸素濃度を制御する。吸気通路3の第2の区間32には、酸素センサ13が配置されている。酸素濃度の制御は、吸気通路3の第2の区間32における新気8と還流された濾過済排気23との混合気体から検知された酸素濃度に基づいて実行される。制御は、混合過程の物理モデルに基づいて設計され、実行される。
【選択図】図1
Description
この実施形態は、内燃機関2における吸入空気の酸素濃度を制御するための内燃機関用制御装置1に関する。図1は、本発明を適用した第1実施形態に係る内燃機関用制御装置1のブロック図である。内燃機関1を代表するものとして、図の中央部に、内部にピストンが配置されたシリンダが図示されている。シリンダとピストンは、燃焼室内に入れられた気体を圧縮する。燃焼室では、吸気と添加された燃料とが燃焼され、排気になる燃焼工程が実行される。
Claims (19)
- 吸気通路(3)、排気通路(4)、および前記排気通路(4)から前記吸気通路(3)へ濾過された濾過済排気(6)を還流する濾過済排気還流装置(5)を備える内燃機関(2)のための内燃機関用制御装置において、
前記吸気通路(3)は、前記吸気通路(3)への前記濾過済排気の合流口(7)の上流に位置する第1の区間(31)と、前記吸気通路(3)への前記濾過済排気の合流口(7)の下流であって、かつ機関入口(9)の上流に位置し、新気(8)と還流された濾過済排気(23)との混合気体が流れることができる第2の区間(32)とを備え、
前記排気通路(4)は、パティキュレートフィルタ(11)の上流に位置し、非濾過排気(12)が流れる第1の区間(41)と、前記パティキュレートフィルタ(11)の下流に位置し、濾過済排気が流れる第2の区間(42)とを備え、
さらに、前記吸気通路(3)の前記第2の区間(32)に配置された吸気酸素センサ(13)に基づいて、前記濾過済排気還流装置(5)から還流される濾過済排気(23)の質量流量を調節することにより、前記吸気通路(3)の前記第2の区間(32)における新気(8)と濾過済排気(23)との混合気体の酸素濃度を制御する制御手段(14)を備えることを特徴とする内燃機関用制御装置。 - 前記制御手段(14)は、酸素濃度予測値を算出するための制御手段(14)であって、酸素濃度の調節のための遅延時間、および/または酸素濃度の検出のための遅延時間を予測するように適合されたモデルに基づいて構成されていることを特徴とする請求項1に記載の内燃機関用制御装置。
- さらに、前記吸気通路(3)の前記第1の区間(31)に配置された新気(8)の質量流量を決定するための質量流量センサ(15)を備えることを特徴とする請求項1または請求項2に記載の内燃機関用制御装置。
- さらに、前記吸気通路(3)の前記第2の区間(32)に配置された圧力センサ(21)を備えることを特徴とする請求項1から請求項3のいずれかに記載の内燃機関用制御装置。
- さらに、前記排気通路(4)の前記第2の区間(42)に配置された排気酸素センサ(16)を備えることを特徴とする請求項1から請求項4のいずれかに記載の内燃機関用制御装置。
- 前記吸気酸素センサ(13)は、前記吸気通路(3)に設けられたコンプレッサ(17)の下流に配置されていることを特徴とする請求項1から請求項5のいずれかに記載の内燃機関用制御装置。
- 前記吸気酸素センサ(13)は、前記吸気通路(3)に設けられたインタークーラ(18)の下流に配置されていることを特徴とする請求項1から請求項6のいずれかに記載の内燃機関用制御装置。
- 前記制御手段(14)は、前記新気(8)の質量流量と還流された濾過済排気(23)の質量流量との混合過程のための物理モデルに基づいて、前記吸気通路(3)の前記第2の区間(32)における酸素濃度予測値の算出処理を実行するために適合され、予測精度を高めるように前記物理モデルを補正するために、実際に決定された酸素濃度が用いられることを特徴とする請求項1から請求項7のいずれかに記載の内燃機関用制御装置。
- さらに、酸素濃度の検出を較正するための較正手段を備えることを特徴とする請求項1から請求項8のいずれかに記載の内燃機関用制御装置。
- 前記較正手段は、前記酸素センサの近くにおける圧力として決定された圧力に基づいて、かつ圧力によって生じる酸素濃度の検出値のバイアス量のための相関マップに基づいて、酸素濃度の検出値を補正するように適合されていることを特徴とする請求項9に記載の内燃機関用制御装置。
- 前記較正手段は、前記吸気酸素センサ(13)の近くにおける圧力として決定された圧力、および新気(8)だけが前記吸気酸素センサ(13)に接触する運転状態の間の新気(8)の既知の酸素濃度とに基づいて、酸素濃度の検出値における圧力由来のバイアス量を補正するように適合されていることを特徴とする請求項9または請求項10に記載の内燃機関用制御装置。
- 前記吸気酸素センサ(13)は、空燃比センサであることを特徴とする請求項1から請求項11のいずれかに記載の内燃機関用制御装置。
- 前記内燃機関(2)は、前記排気通路(4)の前記第1の区間(41)から前記吸気通路(3)の第3の区間(33)へ非濾過排気(12)を戻すための非濾過排気還流装置(20)を有し、
前記吸気通路(3)の前記第3の区間(33)は、前記吸気通路(3)への非濾過排気の合流口(26)の下流であって、かつ機関入口(9)の上流に位置しており、
さらに、前記吸気通路(3)の前記第3の区間(33)には、新気(8)、還流した濾過済排気(23)、および還流した非濾過排気(27)の混合気体が流れることを特徴とする請求項1から請求項12のいずれかに記載の内燃機関用制御装置。 - 内燃機関の吸気通路における酸素濃度を制御する内燃機関用制御方法において、
内燃機関用制御装置を用いることにより、濾過済排気の合流口(7)から機関入口(9)への方向に延びる吸気通路(3)の第2の区間(32)における新気(8)と還流された濾過済排気(23)との混合気体から検出された酸素濃度の検出値に基づいて還流された濾過済排気(23)の質量流量を設定することにより、前記吸気通路(3)の第2の区間(32)における新気(8)と還流された濾過済排気(23)との混合気体の酸素濃度を調節することを特徴とする内燃機関用制御方法。 - 濾過済排気還流装置(5)から還流された濾過済排気(23)の質量流量は制御弁(22)の駆動状態により調節可能であり、前記制御弁(22)により前記還流された濾過済排気(23)の質量流量を設定することにより、酸素濃度の調節を実行することを特徴とする請求項14に記載の内燃機関用制御方法。
- 酸素濃度の調節のための遅延時間、および/または前記吸気通路(3)の第2の区間(32)における酸素濃度の検出のための遅延時間を予測するためにモデルに基づく調節を用いることを特徴とする請求項14または請求項15に記載の内燃機関用制御方法。
- 新気(8)の質量流量と還流された濾過済排気(23)の質量流量との混合過程のための物理モデルを用いたモデルに基づく調節を用いることを特徴とする請求項14から請求項16のいずれかに記載の内燃機関用制御方法。
- 前記内燃機関用制御装置は、請求項1から請求項13のいずれかに記載の構成を有することを特徴とする請求項14から請求項17のいずれかに記載の内燃機関用制御方法。
- 前記吸気酸素センサ(13)の検出値の較正のために還流した濾過済排気(23)の質量流量をゼロに設定し、既知の酸素濃度の新気(8)だけに前記吸気酸素センサ(13)を晒すことを特徴とする請求項14から請求項18のいずれかに記載の内燃機関用制御方法。
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