JP5028509B2 - 内燃機関のegr制御装置 - Google Patents
内燃機関のegr制御装置 Download PDFInfo
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Description
2 ECU(第1EGR制御入力算出手段、第1EGR制御手段、推定第1不活性 ガスパラメータ算出手段、第2EGR制御入力算出手段、第2EGR制御手段 、推定筒内不活性ガスパラメータ算出手段、目標筒内不活性ガスパラメータ算 出手段、ガス状態パラメータ検出手段、推定ガス状態パラメータ算出手段、誤 差パラメータ算出手段、修正値算出手段、割合パラメータ算出手段、分割手段 、第1EGR用修正値算出手段、第2EGR用修正値算出手段、目標第1不活 性ガス量算出手段)
3 内燃機関
3a 気筒
5 吸気通路
10 排気通路
11 低圧EGR装置(第1EGR装置)
12 高圧EGR装置(第2EGR装置)
22 エアフローセンサ(ガス状態パラメータ検出手段)
28 LAFセンサ(ガス状態パラメータ検出手段)
40 目標不活性ガス総流量算出部(目標筒内不活性ガスパラメータ算出手段)
50 目標LP不活性ガス流量算出部(目標第1不活性ガス量算出手段)
60 不活性ガス推定部(推定第1不活性ガスパラメータ算出手段、推定不活性ガス パラメータ算出手段)
70 モデル修正器(誤差パラメータ算出手段、修正値算出手段、分割手段、割合パ ラメータ算出手段、第1EGR用修正値算出手段、第2EGR用修正値算出手 段)
80 LP開度コントローラ(第1EGR制御入力算出手段)
90 HP開度コントローラ(第2EGR制御入力算出手段)
160 不活性ガス推定部(推定第1不活性ガスパラメータ算出手段、推定不活性ガス パラメータ算出手段、推定ガス状態パラメータ算出手段)
αLP_cmd 目標LP開度(第1EGR制御入力)
αHP_cmd 目標HP開度(第2EGR制御入力)
dGiegr_cyl_LP_hat 筒内LP不活性ガス流量の推定値(推定第1不活性ガスパラメータ 、推定第1不活性ガス量)
dGiegr_CP_hat チャンバ不活性ガス流量の推定値(推定第1不活性ガスパラメータ )
dGiegr_cyl_hat 筒内不活性ガス総流量の推定値(推定筒内不活性ガスパラメータ、 推定不活性ガス総量)
dGiegr_cmd 目標不活性ガス総流量(目標筒内不活性ガスパラメータ、目標不活 性ガス総量)
dGiegr_LP_cmd 目標LP不活性ガス流量(目標第1不活性ガス量)
dGafm 新気流量(ガス状態パラメータ)
dGafm_hat 新気流量の推定値(推定ガス状態パラメータ)
φ 検出当量比(ガス状態パラメータ)
φ_hat 検出当量比の推定値(推定ガス状態パラメータ)
EVNS 誤差(誤差パラメータ)
EVNS_LP LP用誤差(第1EGR用の誤差パラメータ)
EVNS_HP HP用誤差(第2EGR用の誤差パラメータ)
KVNS_LP LP用修正値(修正値、第1EGR用修正値)
KVNS_HP HP用修正値(修正値、第2EGR用修正値)
RLP LP不活性ガス比(割合パラメータ)
Claims (4)
- 第1EGR装置により、既燃ガスの一部が第1EGRガスとして吸気通路内に供給されるとともに、第2EGR装置により、既燃ガスの一部が第2EGRガスとして前記第1EGR装置よりも短い経路で気筒内に供給される内燃機関のEGR制御装置であって、
前記第1EGR装置を制御するための第1EGR制御入力を算出する第1EGR制御入力算出手段と、
当該算出された第1EGR制御入力を用いて、前記第1EGR装置を制御する第1EGR制御手段と、
前記吸気通路内にまたは前記吸気通路を介して前記気筒内に供給される第1EGRガス中の不活性ガス量と、当該第1EGRガス中の不活性ガス割合との一方の推定値である推定第1不活性ガスパラメータを、ニューラルネットワークおよび物理式を併用するモデリング手法と、ニューラルネットワークを適用したモデリング手法との一方を用いて導出されたモデルを用いて算出する推定第1不活性ガスパラメータ算出手段と、
前記第1EGR装置と前記第2EGR装置によって前記気筒内に供給される不活性ガス総量、および当該気筒内の総ガス量に対する当該不活性ガス総量の割合の一方の推定値である推定筒内不活性ガスパラメータを算出する推定筒内不活性ガスパラメータ算出手段と、
当該推定筒内不活性ガスパラメータの目標となる目標筒内不活性ガスパラメータを算出する目標筒内不活性ガスパラメータ算出手段と、
前記算出された推定第1不活性ガスパラメータおよび所定のフィードバック制御アルゴリズムを用いて、前記算出された推定筒内不活性ガスパラメータが前記算出された目標筒内不活性ガスパラメータに収束するように、前記第2EGR装置を制御するための第2EGR制御入力を算出する第2EGR制御入力算出手段と、
当該算出された第2EGR制御入力を用いて、前記第2EGR装置を制御する第2EGR制御手段と、
を備えることを特徴とする内燃機関のEGR制御装置。 - 前記内燃機関の前記吸気通路および排気通路の一方を流れるガスの物理量および化学量の一方を表すガス状態パラメータを検出するガス状態パラメータ検出手段と、
当該ガス状態パラメータの推定値として推定ガス状態パラメータを算出する推定ガス状態パラメータ算出手段と、
当該算出された推定ガス状態パラメータおよび前記検出されたガス状態パラメータを用いて、前記モデルの誤差を表す誤差パラメータを算出する誤差パラメータ算出手段と、
当該算出された誤差パラメータを用いて、前記モデルを修正するための修正値を算出する修正値算出手段と、
をさらに備え、
前記推定第1不活性ガスパラメータ算出手段は、前記算出された修正値で修正された前記モデルを用いて、前記推定第1不活性ガスパラメータを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EGR制御装置。 - 前記モデルは、前記吸気通路および前記排気通路内のガスの物理量と前記第1EGRガス量との関係を表す第1EGRモデルと、前記吸気通路および前記排気通路内のガスの物理量と前記第2EGRガス量との関係を表す第2EGRモデルとを含み、
前記推定第1不活性ガスパラメータ算出手段は、前記推定第1不活性ガスパラメータとして、前記気筒内に供給される第1EGRガス中の不活性ガス量である推定第1不活性ガス量を算出し、
前記修正値算出手段は、
前記推定第1不活性ガス量と、前記気筒内に供給される第2EGRガス中の不活性ガス量の推定値である推定第2不活性ガス量との割合を表す割合パラメータを算出する割合パラメータ算出手段と、
当該算出された割合パラメータを用いて、前記誤差パラメータを第1EGR用の誤差パラメータと第2EGR用の誤差パラメータとに分割する分割手段と、
当該第1EGR用の誤差パラメータを用いて、前記修正値として、前記第1EGRモデルを修正するための第1EGR用修正値を算出する第1EGR用修正値算出手段と、
前記第2EGR用の誤差パラメータを用いて、前記修正値として、前記第2EGRモデルを修正するための第2EGR用修正値を算出する第2EGR用修正値算出手段と、
を有し、
前記推定第1不活性ガスパラメータ算出手段は、前記算出された第1EGR用修正値で修正された前記第1EGRモデルと、前記算出された第2EGR用修正値で修正された前記第2EGRモデルとを用いて、前記推定第1不活性ガス量を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EGR制御装置。 - 前記推定第1不活性ガスパラメータ算出手段は、前記推定第1不活性ガスパラメータとして、前記気筒内に供給される第1EGRガス中の不活性ガス量である推定第1不活性ガス量を算出し、
当該推定第1不活性ガス量の目標となる目標第1不活性ガス量を算出する目標第1不活性ガス量算出手段をさらに備え、
前記第1EGR制御入力算出手段は、当該算出された目標第1不活性ガス量を用いて、前記第1EGR制御入力を算出し、
前記モデルは、前記吸気通路および前記排気通路内のガスの物理量と前記第1EGRガス量との関係を表す第1EGRモデルと、前記吸気通路および前記排気通路内のガスの物理量と前記第2EGRガス量との関係を表す第2EGRモデルとを含み、
前記推定筒内不活性ガスパラメータは、前記不活性ガス総量の推定値である推定不活性ガス総量であり、
前記目標筒内不活性ガスパラメータは、当該推定不活性ガス総量の目標となる目標不活性ガス総量であり、
前記修正値算出手段は、
前記目標第1不活性ガス量と前記目標不活性ガス総量との比を用いて、前記誤差パラメータを第1EGR用の誤差パラメータと第2EGR用の誤差パラメータとに分割する分割手段と、
当該第1EGR用の誤差パラメータを用いて、前記修正値として、前記第1EGRモデルを修正するための第1EGR用修正値を算出する第1EGR用修正値算出手段と、
前記第2EGR用の誤差パラメータを用いて、前記修正値として、前記第2EGRモデルを修正するための第2EGR用修正値を算出する第2EGR用修正値算出手段と、
を有し、
前記推定第1不活性ガスパラメータ算出手段は、前記算出された第1EGR用修正値で修正された前記第1EGRモデルと、前記算出された第2EGR用修正値で修正された前記第2EGRモデルとを用いて、前記推定第1不活性ガス量を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EGR制御装置。
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