JP4757886B2 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
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- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
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- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
- F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
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- F02D41/0002—Controlling intake air
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- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
- F02D2041/0075—Estimating, calculating or determining the EGR rate, amount or flow by using flow sensors
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- F02D41/30—Controlling fuel injection
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Output Control And Ontrol Of Special Type Engine (AREA)
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Description
[第1の実施形態]
図1は本発明の第1の実施形態にかかる内燃機関、及びその制御装置の構成を示す図である。内燃機関(以下「エンジン」という)1は、シリンダ内に燃料を直接噴射するディーゼルエンジンであり、各気筒に燃料噴射弁9が設けられている。燃料噴射弁9は、電子制御ユニット(以下「ECU」という)20に電気的に接続されており、燃料噴射弁9の開弁時期及び開弁時間は、すなわち燃料噴射時期及び燃料噴射量ECU20により制御される。
N個の要素からなる入力データベクトルxjを下記式(1)で定義し、自己組織化マップを構成する各ニューロンの重みベクトルwiを下記式(2)で定義する。ニューロンの数はM個とする。すなわち、パラメータiは、1からMまでの値をとる。重みベクトルwiの初期値は乱数を用いて与えられる。
xj=(xj1,xj2,…,xjN) (1)
wi=(wi1,wi2,…,wiN) (2)
wi(t+1)=wi(t)+α(t)(xj−wi(t)) (4)
wi(t+1)=wi(t) (5)
xEGR=(Lcmd,PB,TI,PE,Tout,GA,NE)
(10)
Ci=(C0i,C1i,C2i,C3i,C4i,C5i,C6i,C7i)
(11)
EGRhat=C1i×Lcmd+C2i×PB+C3i×TI+C4i×PE
+C5i×Tout+C6i×GA+C7i×NE+C0i
(12)
Rm1=Toutm1/(Toutm1+Toutm2) (13)
Toutmbs(k)=Tout(k)−Toutp(k) (14)
Toutm1bs(k)=Km1×Rm1×Toutmbs(k) (15)
Toutm1(k)=min(Toutmbs(k),Toutm1bs(k))
(16)
Toutm2(k)=Toutmbs(k)−Toutm1(k) (17)
ステップS31では、上述した自己組織化マップ(SOM)を用いて、推定排気還流量EGRhatを算出する。すなわち、EGR弁のリフト量指令値Lcmd及び過給圧PBに応じてニューロンNRiを選択し、ニューロンNRiに対応する重み係数ベクトルCi及び各入力パラメータを式(12)に適用して、推定排気還流量EGRhatを算出する。
θCR(k)T=[a(k) b(k)] (21)
θCR(k)=θCR(k-1)+KP(k)×eid(k) (22)
eid(k)=EGRact(k)−θCR(k-1)Tζ(k) (23)
ζT(k)=[EGRhat(k) 1] (24)
EGRls=a(k)×EGRhat+b(k) (27)
本実施形態は、リーンNOx触媒31に捕捉されたNOx量の算出に適用されるNOx排出量を、相関パラメータa(k)に応じて補正するようにしたものである。以下、第1の実施形態と異なる点を説明する。
xNOx=(Lcmd,PB,TI,PE,Tout,Rm1,GA,NE)
(31)
CNOxi=(CNOx0i,CNOx1i,CNOx2i,
CNOx3i,CNOx4i,CNOx5i,
CNOx6i,CNOx7i,CNOx8i) (32)
NOxhat=CNOx1i×Lcmd+CNOx2i×PB
+CNOx3i×TI+CNOx4i×PE
+CNOx5i×Tout+CNOx6i×Rm1
+CNOx7i×GA+CNOx8i×NE+CNOx0i
(33)
xRed=(Lcmd,PB,TI,PE,Tout,Rm1,
Toutpost,GA,NE) (34)
CRedi=(CRed0i,CRed1i,CRed2i,CRed3i,
CRed4i,CRed5i,CRed6i,CRed7i,
CRed8i,CRed9i) (35)
Redhat=CRed1i×Lcmd+CRed2i×PB
+CRed3i×TI+CRed4i×PE+CRed5i×Tout
+CRed6i×Rm1+CRed7i×Toutpost
+CRed8i×GA+CRed9i×NE+CRed0i (36)
MNOx(k)=MNOx(k-1)+Krsm×NOxhat/a(k) (37)
MNOx(k)=MNOx(k-1)−Redhat (38)
Toutm1=Rm1×Toutmbs (15a)
図20は本実施形態にかかる内燃機関及びその制御装置の構成を示す図である。本実施形態では、排気還流量センサ26が設けられておらず、排気管4のエンジン1の直ぐ下流側に空燃比センサ30が設けられている。空燃比センサ30は、排気中の酸素濃度を検出することにより、燃焼室内の混合気の空燃比AFを検出し、検出信号をECU20に供給する。図20に示すこれ以外の構成は、図1に示す構成と同一である。
Lcmd(k)=Lcmdbs(k)+Lsmc(k) (41)
σL(k)=eaf(k)+SL×eaf(k-1) (45)
eaf(k)=Kact(k)−Kcmd(k) (46)
σV(k)=epb(k)+Sθ×epb(k-1) (50)
epb(k)=PBcmd(k)−PB(k) (51)
Toutm1(k)=Km1×Rm1×Toutmbs(k) (15b)
ステップS101ではEGR弁リフト量指令値Lcmd(k)及び検出過給圧PB(k)を下記式(61)に適用し、EGR量SOMのすべてのニューロンについて2次元距離Disci(k)を算出する。式(61)のLcmdci及びPBciは、i番目(i=1〜M)のニューロンNRiの図2に示す2次元平面上の座標である。
Discmin(k)=
min(Disc1(k),Disc2(k),…,DiscM(k)) (62)
Disemin(k)=
min(Dise1(k),Dise2(k),…,DiseM(k)) (65)
Disamin(k)=
min(Disa1(k),Disa2(k),…,DisaM(k)) (68)
本実施形態は、リーンNOx触媒31に捕捉されたNOx量の算出に適用されるNOx排出量を、距離パラメータDiscaveに応じて補正するようにしたものである。以下、第3の実施形態と異なる点を説明する。
MNOx(k)=MNOx(k-1)
+(1+Discave(k))×Krsm×NOxhat (71)
図34は本発明の第5の実施形態にかかる内燃機関及びその制御装置の構成を示す図である。本実施形態では、吸気管2は吸気管2A,2Bに分岐し、さらに各気筒に対応して分岐する。なお、図34には1つの気筒に対応する構成のみが示されている。エンジン1の各気筒には、2つの吸気弁(図示せず)及び2つの排気弁(図示せず)が設けられている。2つの吸気弁により開閉される吸気口(図示せず)はそれぞれ吸気管2A,2Bに接続されている。
θSCV=KSCV×θSCVbs (81)
ただし、算出されたSCV開度制御量θSCVが全開状態に対応する上限値θSCVMAXを超えたときは、SCV開度制御量θSCVは上限値θSCVMAXに設定される。
本実施形態は、第3の実施形態において、さらに距離パラメータDiscave(k)を用いて、SCV開度制御量θSCVを算出するようにしたものである。すなわち、本実施形態では図34に示す構成から、排気還流量センサ26を削除し、空燃比センサ30を追加した構成が採用される(図示省略)。以下に説明する点以外は、第3の実施形態と同一である。
5 排気還流通路(排気還流手段)
6 排気還流制御弁(排気還流手段)
9 燃料噴射弁(燃料噴射手段)
20 電子制御ユニット(推定排気還流量算出手段、機関制御パラメータ算出手段、差パラメータ算出手段、燃料噴射制御手段、故障判定手段)
26 排気還流量センサ(排気還流量検出手段)
31 リーンNOx触媒(NOx浄化手段)
41 スワール制御弁(スワール制御手段)
Claims (6)
- 排気の一部を吸気系に還流する排気還流手段を備える内燃機関の制御装置において、
前記機関の運転状態を示す機関運転パラメータが入力され、前記排気還流手段による排気還流量の推定値を出力するニューラルネットワークを用いて、推定排気還流量を算出する推定排気還流量算出手段と、
前記機関を制御するための機関制御パラメータであって、前記排気還流手段による排気還流量の影響を受ける機関制御パラメータを、前記推定排気還流量に基づいて算出する機関制御パラメータ算出手段と、
前記排気還流量を検出する排気還流量検出手段とを備え、
前記機関制御パラメータ算出手段は、検出された排気還流量と前記推定排気還流量との差を示す差パラメータを算出する差パラメータ算出手段を有し、前記差パラメータに応じて前記機関制御パラメータを算出し、
前記ニューラルネットワークは、新品でありかつ量産される平均的な特性を有する機関に対応して設定されており、
前記差パラメータは、前記推定排気還流量と検出排気還流量との関係を示す近似直線の傾きを示す相関パラメータであって、逐次型統計処理アルゴリズムにより算出されるものであることを特徴とする内燃機関の制御装置。 - 前記ニューラルネットワークは、自己組織化マップアルゴリズムが適用されるものであることを特徴とする請求項1に記載の内燃機関の制御装置。
- 前記機関は燃焼室内に燃料を噴射する燃料噴射手段を備え、
前記機関の所定運転状態において、1燃焼サイクル中に複数回の燃料噴射を実行するように前記燃料噴射手段を制御する燃料噴射制御手段を備え、
前記機関制御パラメータは、前記複数回の燃料噴射における燃料噴射量の分割比率を含むことを特徴とする請求項1または2に記載の内燃機関の制御装置。 - 前記機関は、排気中のNOxを浄化するNOx浄化手段を備え、
前記NOx浄化手段に捕捉されるNOx量の推定値である推定捕捉NOx量を算出する捕捉NOx量推定手段を備え、
前記機関制御パラメータは、前記推定捕捉NOx量を含むことを特徴とする請求項1から3の何れか1項に記載の内燃機関の制御装置。 - 前記機関は燃焼室内の混合気のスワールを制御するスワール制御手段を備え、
前記機関制御パラメータは、前記スワール制御手段の制御量を含むことを特徴とする請求項1から4の何れか1項に記載の内燃機関の制御装置。 - 前記差パラメータに基づいて前記排気還流手段の故障を判定する故障判定手段をさらに備えることを特徴とする請求項1から5の何れか1項に記載の内燃機関の制御装置。
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EP08001628A EP2085593B1 (en) | 2008-01-29 | 2008-01-29 | Control system for internal combustion engine |
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