JP6540824B2 - Wiebe関数パラメータ同定方法及びWiebe関数パラメータ同定装置 - Google Patents
Wiebe関数パラメータ同定方法及びWiebe関数パラメータ同定装置 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 46
- 238000002485 combustion reaction Methods 0.000 claims description 289
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- 238000004364 calculation method Methods 0.000 claims description 20
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- 238000013459 approach Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 description 39
- 239000007924 injection Substances 0.000 description 39
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- 244000089486 Phragmites australis subsp australis Species 0.000 description 30
- 230000020169 heat generation Effects 0.000 description 11
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- 238000013500 data storage Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
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- 239000002131 composite material Substances 0.000 description 4
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- 238000012545 processing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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Description
内燃機関の運転時の運転データを取得し、
前記運転データと、前記第1Wiebe関数及び前記第2Wiebe関数の少なくとも1つの同一パラメータの値間の差分とに基づいて、前記Wiebe関数の組み合わせに含まれる複数のパラメータの値を同定することを含み、
複数の前記パラメータは、前記第1Wiebe関数及び前記第2Wiebe関数のそれぞれに含まれる形状指数、燃焼開始時期、及び燃焼期間を含み、
前記差分は、前記形状指数の差分及び前記燃焼期間の差分のうちの少なくともいずれか一方を含む、Wiebe関数パラメータ同定方法が提供される。
併せて、燃焼開始時期θsocからある時期Θまでの発生した総熱発生量は下式で表される。
図9を再度参照する。パラメータ同定装置10は、運転データ取得部11と、筒内圧データ取得部12と、熱発生率算出部13と、最適化演算部14と、モデルパラメータ格納部15と、モデルパラメータ記憶部16とを含む。これらの各部の説明は後に行う。尚、運転データ取得部11、筒内圧データ取得部12、熱発生率算出部13、最適化演算部14、及びモデルパラメータ格納部15は、例えば、図11に示した制御部101が主記憶部102等内の1つ以上のプログラムを実行することで実現できる。また、モデルパラメータ記憶部16は、例えば図11に示した補助記憶部103により実現できる。
2 運転データ記憶部
4 エンジンシステム
6、6A センサ群
10、10A パラメータ同定装置
11 運転データ取得部
12、12A 筒内圧データ取得部
13 熱発生率算出部
14 最適化演算部
15 モデルパラメータ格納部
16 モデルパラメータ記憶部
30 エンジン制御装置
32 モデルパラメータ取得部
34 Wiebe関数演算部
36 エンジントルク算出部
38 制御値算出部
Claims (5)
- 内燃機関の気筒内の燃焼による熱発生率を、第1Wiebe関数及び第2Wiebe関数を含む2つ以上のWiebe関数の組み合わせによりモデル化するWiebe関数パラメータ同定方法であって、
内燃機関の運転時の運転データを取得し、
前記運転データと、前記第1Wiebe関数及び前記第2Wiebe関数の少なくとも1つの同一パラメータの値間の差分とに基づいて、前記Wiebe関数の組み合わせに含まれる複数のパラメータの値を同定することを含み、
複数の前記パラメータは、前記第1Wiebe関数及び前記第2Wiebe関数のそれぞれに含まれる形状指数、燃焼開始時期、及び燃焼期間を含み、
前記差分は、前記形状指数の差分及び前記燃焼期間の差分のうちの少なくともいずれか一方を含む、Wiebe関数パラメータ同定方法。 - 前記複数のパラメータの値を同定することは、評価式を用いた最適化計算により前記複数の前記パラメータの値を同定することを含み、
前記評価式は、前記差分が大きいほど最適解に近づく第1の項を含む、請求項1に記載のWiebe関数パラメータ同定方法。 - 前記評価式は、前記運転データに基づく熱発生率の算出値と前記Wiebe関数の組み合わせに基づく熱発生率の算出値との第2差分が小さいほど最適解に近づく第2の項を更に含む、請求項2に記載のWiebe関数パラメータ同定方法。
- 前記評価式は、前記第1の項及び前記第2の項のそれぞれに対する重み付け係数を含む、請求項3に記載のWiebe関数パラメータ同定方法。
- 内燃機関の気筒内の燃焼による熱発生率を、第1Wiebe関数及び第2Wiebe関数を含む2つ以上のWiebe関数の組み合わせによりモデル化するWiebe関数パラメータ同定装置であって、
内燃機関の運転時の運転データを取得する取得部と、
前記運転データと、前記第1Wiebe関数及び前記第2Wiebe関数の少なくとも1つの同一パラメータの値間の差分とに基づいて、前記Wiebe関数の組み合わせに含まれる複数のパラメータの値を同定する同定部とを含み、
複数の前記パラメータは、前記第1Wiebe関数及び前記第2Wiebe関数のそれぞれに含まれる形状指数、燃焼開始時期、及び燃焼期間を含み、
前記差分は、前記形状指数の差分及び前記燃焼期間の差分のうちの少なくともいずれか一方を含む、Wiebe関数パラメータ同定装置。
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JP4581993B2 (ja) * | 2005-12-26 | 2010-11-17 | トヨタ自動車株式会社 | 内燃機関の燃焼異常検出装置 |
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