JP6477088B2 - NOx吸蔵量推定装置 - Google Patents
NOx吸蔵量推定装置 Download PDFInfo
- Publication number
- JP6477088B2 JP6477088B2 JP2015057084A JP2015057084A JP6477088B2 JP 6477088 B2 JP6477088 B2 JP 6477088B2 JP 2015057084 A JP2015057084 A JP 2015057084A JP 2015057084 A JP2015057084 A JP 2015057084A JP 6477088 B2 JP6477088 B2 JP 6477088B2
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- Prior art keywords
- nox
- amount
- catalyst
- occlusion
- nox occlusion
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- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
- F02D2200/0804—Estimation of the temperature of the exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0808—NOx storage capacity, i.e. maximum amount of NOx that can be stored on NOx trap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
- F02D41/2448—Prohibition of learning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2454—Learning of the air-fuel ratio control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
NOxパージ制御部60は、本発明の触媒再生手段であって、排気をリッチ状態にしてNOx吸蔵還元型触媒32に吸蔵されているNOxを還元浄化により無害化して放出することで、NOx吸蔵還元型触媒32のNOx吸蔵能力を回復させる触媒再生処理(以下、この制御をNOxパージ制御という)を実行する。
図3は、NOxパージリーン制御部60AによるMAF目標値MAFNPL_Trgtの設定処理を示すブロック図である。第1目標空気過剰率設定マップ61は、エンジン回転数Ne及びアクセル開度Qに基づいて参照されるマップであって、これらエンジン回転数Neとアクセル開度Qとに対応したNOxパージリーン制御時の空気過剰率目標値λNPL_Trgt(第1目標空気過剰率)が予め実験等に基づいて設定されている。
数式(1)において、Qfnl_corrdは後述する学習補正された筒内インジェクタ11の燃料噴射量(ポスト噴射を除く)、RoFuelは燃料比重、AFRstoは理論空燃比、Maf_corrは後述するMAF補正係数をそれぞれ示している。
図4は、NOxパージリッチ制御部60Bによる排気管噴射又はポスト噴射の目標噴射量QNPR_Trgt(単位時間当たりの噴射量)の設定処理を示すブロック図である。第2目標空気過剰率設定マップ65は、エンジン回転数Ne及びアクセル開度Qに基づいて参照されるマップであって、これらエンジン回転数Neとアクセル開度Qとに対応したNOxパージリッチ制御時の空気過剰率目標値λNPR_Trgt(第2目標空気過剰率)が予め実験等に基づいて設定されている。
数式(2)において、MAFNPL_TrgtはNOxパージリーンMAF目標値であって、前述のMAF目標値演算部62から入力される。また、Qfnl_corrdは後述する学習補正されたMAF追従制御適用前の筒内インジェクタ11の燃料噴射量(ポスト噴射を除く)、RoFuelは燃料比重、AFRstoは理論空燃比、Maf_corrは後述するMAF補正係数をそれぞれ示している。
NOxパージ制御は、(1)NOxパージフラグFNPのオンから排気管噴射又はポスト噴射の噴射量を累積し、この累積噴射量が所定の上限閾値量に達した場合、(2)NOxパージ制御の開始から計時した経過時間が所定の上限閾値時間に達した場合、(3)NOx吸蔵量推定部70によって推定されるNOx吸蔵量推定値str_estがNOx除去成功を示す所定の閾値まで低下した場合の何れかの条件が成立すると、NOxパージフラグFNPをオフにして終了される(図2の時刻t2参照)。
図5は、NOx吸蔵量推定部70によるNOx吸蔵量推定値str_estの推定処理を説明するブロック図である。
触媒出口NOx量演算部79は、NOx吸蔵還元型触媒32を通過した排気ガス中のNOx量(以下、触媒出口NOx量Out_NOxという)を演算する。触媒出口NOx量Out_NOxは、触媒入口NOx量In_NOxからNOx吸蔵量推定値str_estを減算した値に、リーン時NOx放出量rel_lean_utを加算する以下の数式(4)に基づいて演算される。
本実施形態では、このように、リーン運転時に排気温度の上昇等によってNOx吸蔵還元型触媒32から離脱して放出されるリーン時NOx放出量rel_lean_utを考慮に入れて、NOx吸蔵量推定値str_estや触媒出口NOx量Out_NOxを推定演算することで、これらの推定精度を確実に向上することが可能になる。
MAF追従制御部80は、(1)通常運転のリーン状態からNOxパージ制御によるリッチ状態への切り替え期間及び、(2)NOxパージ制御によるリッチ状態から通常運転のリーン状態への切り替え期間に、各筒内インジェクタ11の燃料噴射タイミング及び燃料噴射量をMAF変化に応じて補正するMAF追従制御を実行する。
図6に示すように、噴射量学習補正部90は、学習補正係数演算部91と、噴射量補正部92とを有する。
MAF補正係数演算部95は、NOxパージ制御時のMAF目標値MAFNPL_Trgtや目標噴射量QNPR_Trgtの設定に用いられるMAF補正係数Maf_corrを演算する。
なお、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。
11 筒内インジェクタ
12 吸気通路
13 排気通路
16 吸気スロットルバルブ
24 EGRバルブ
31 酸化触媒
32 NOx吸蔵還元型触媒
33 フィルタ
34 排気インジェクタ
40 MAFセンサ
45 NOx/ラムダセンサ
50 ECU
Claims (2)
- エンジンの排気通路に設けられて排気中のNOxを浄化するNOx吸蔵型触媒のNOx吸蔵量推定装置であって、
前記NOx吸蔵型触媒の触媒温度を取得する触媒温度取得手段と、
前記エンジンの運転状態から推定される触媒入口NOx量及び、前記触媒温度取得手段によって取得される触媒温度に基づいて、前記エンジンから排出されて前記NOx吸蔵型触媒に吸蔵されるNOx量を暫定NOx吸蔵量として演算する暫定NOx吸蔵量演算手段と、
前記触媒入口NOx量及び前記触媒温度に基づいて、前記触媒のNOx吸蔵容量を演算する吸蔵容量演算手段と、
前記吸蔵容量演算手段によって演算された前記NOx吸蔵容量に基づいて、NOx吸蔵レベルを演算する吸蔵レベル演算手段と、
前記エンジンのリーン運転時に前記触媒温度取得手段によって取得される触媒温度、前記吸蔵レベル演算手段によって演算されたNOx吸蔵レベル、及びNOx放出速度に基づいて、当該リーン運転時に前記NOx吸蔵型触媒から離脱して放出されるリーン時NOx放出量を演算するNOx放出量演算手段と、
前記暫定NOx吸蔵量から前記リーン時NOx放出量を減算することで、前記NOx吸蔵型触媒に吸蔵されている実NOx吸蔵量を演算する実NOx吸蔵量演算手段と、を備える
NOx吸蔵量推定装置。 - 前記NOx吸蔵型触媒が、排気リーン状態で排気中のNOxを吸蔵すると共に、排気リッチ状態で吸蔵されていたNOxを還元浄化するNOx吸蔵還元型触媒であって、
前記触媒温度取得手段によって取得される触媒温度に基づいて、排気リッチ状態で前記NOx吸蔵還元型触媒から還元浄化されるNOx還元量を演算するNOx還元量演算手段をさらに備え、
前記実NOx吸蔵量演算手段は、前記暫定NOx吸蔵量から前記リーン時NOx放出量と前記NOx還元量とを減算することで、前記実NOx吸蔵量を演算する
請求項1に記載のNOx吸蔵量推定装置。
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US15/560,024 US10683788B2 (en) | 2015-03-20 | 2016-03-15 | NOx occlusion amount estimating device and NOx occlusion amount estimating method |
EP16768555.1A EP3273024B1 (en) | 2015-03-20 | 2016-03-15 | NOx OCCLUSION AMOUNT ESTIMATING DEVICE AND NOx OCCLUSION AMOUNT ESTIMATING METHOD |
CN201680016635.8A CN107407180B (zh) | 2015-03-20 | 2016-03-15 | NOx吸收量推定装置和NOx吸收量推定方法 |
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US20180073413A1 (en) | 2018-03-15 |
WO2016152652A1 (ja) | 2016-09-29 |
EP3273024A4 (en) | 2018-12-26 |
JP2016176403A (ja) | 2016-10-06 |
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CN107407180A (zh) | 2017-11-28 |
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