JP6079116B2 - engine - Google Patents

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JP6079116B2
JP6079116B2 JP2012224286A JP2012224286A JP6079116B2 JP 6079116 B2 JP6079116 B2 JP 6079116B2 JP 2012224286 A JP2012224286 A JP 2012224286A JP 2012224286 A JP2012224286 A JP 2012224286A JP 6079116 B2 JP6079116 B2 JP 6079116B2
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cylinder
intake passage
injection
injector
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JP2014077374A (en
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健介 柳川
健介 柳川
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0082—Controlling each cylinder individually per groups or banks

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

本発明は、筒内インジェクタ及び吸気通路インジェクタの燃料噴射の比率を変化させるエンジンに関する。   The present invention relates to an engine that changes a ratio of fuel injection between an in-cylinder injector and an intake passage injector.

筒内に燃料を直接噴射する燃料噴射弁（筒内インジェクタ）を備えるエンジンを搭載する車両がある（例えば、特許文献１）。このエンジンは、着火時期などから燃焼の状態を判断し、燃焼モードを通常燃焼モード又は予混合燃焼モードに切り替える。通常燃焼モードでは、吸気行程中から圧縮行程中の任意の期間に燃料を噴射するパイロット噴射と、圧縮行程中に燃料を噴射するメイン噴射とが含まれる。予混合燃焼モードでは、燃料と空気をあらかじめ混合させておき、これを燃焼させる。これらの２つの燃焼モードを切り替える際に、着火時期がずれたり燃焼が不安定になったりしないように、複数ある気筒のうち一部の気筒を先行して切り替える。燃焼モードを切り換えた後の状況を確認し、他の残りの気筒の燃焼モードを切り替える。   There is a vehicle equipped with an engine equipped with a fuel injection valve (in-cylinder injector) that directly injects fuel into a cylinder (for example, Patent Document 1). This engine determines the state of combustion from the ignition timing and switches the combustion mode to the normal combustion mode or the premixed combustion mode. The normal combustion mode includes pilot injection for injecting fuel during an arbitrary period from the intake stroke to the compression stroke, and main injection for injecting fuel during the compression stroke. In the premixed combustion mode, fuel and air are mixed in advance and burned. When switching between these two combustion modes, some of the plurality of cylinders are switched in advance so that the ignition timing is not shifted and combustion is not unstable. Check the situation after switching the combustion mode, and switch the combustion mode of the other remaining cylinders.

また、筒内に燃料を直接噴射する筒内噴射用インジェクタ（筒内インジェクタ）及び吸気ポートに燃料を噴射する吸気通路噴射用インジェクタ（吸気通路インジェクタ）を各気筒に備えるエンジンを搭載する車両がある（例えば、特許文献２）。このエンジンでは、運転状態に対応させて筒内インジェクタ及び吸気通路インジェクタの噴き分け比率（燃料噴射比率）が決定される。比率は、エンジンの回転数及び負荷率によって決まる運転領域ごとに予め設定されており、筒内インジェクタのみから燃料噴射が行われる場合、吸気通路インジェクタのみから燃料噴射が行われる場合、筒内インジェクタ及び吸気通路インジェクタの両方からそれぞれ決まった割合で燃料噴射が行われる場合に分類される。   Further, there is a vehicle equipped with an engine provided in each cylinder with an in-cylinder injector (in-cylinder injector) that directly injects fuel into the cylinder and an intake-path injector (intake-path injector) that injects fuel into the intake port. (For example, patent document 2). In this engine, the injection ratio (fuel injection ratio) of the in-cylinder injector and the intake passage injector is determined in accordance with the operating state. The ratio is set in advance for each operation region determined by the engine speed and the load factor. When fuel is injected only from the in-cylinder injector, when fuel is injected only from the intake passage injector, the in-cylinder injector and It is classified when fuel injection is performed at a fixed rate from both of the intake passage injectors.

特開２００８−４５５２０号公報JP 2008-45520 A 特開２００６−２５８０１７号公報JP 2006-258017 A

特許文献１の場合、燃料噴射を行なうタイミングを変化させ燃焼モードを変えるのに対し、特許文献２の場合、吸気通路インジェクタと筒内インジェクタから噴射される燃料の比率を変える。したがって、吸気通路インジェクタと筒内インジェクタの燃料噴射の割合は、テーリング制御によって切替えられる。このとき、吸気通路インジェクタが噴射する燃料の圧力に対し、筒内インジェクタが噴射する燃料の圧力は、はるかに高く、噴射時間が短い。また筒内インジェクタから噴射される燃料の量が最小駆動時間によって決まる（クリップされる）とともに、吸気通路インジェクタから噴射された燃料が付着燃料となっている場合などに起因して、空気／燃料比率が、化学量論的値、いわゆる「ストイキ（理論空気量（Stoichimetric Air））」から外れ、リッチ又はリーンになることがある。   In the case of Patent Document 1, the fuel injection timing is changed to change the combustion mode. In the case of Patent Document 2, the ratio of the fuel injected from the intake passage injector and the in-cylinder injector is changed. Therefore, the ratio of fuel injection between the intake passage injector and the in-cylinder injector is switched by tailing control. At this time, the pressure of the fuel injected by the in-cylinder injector is much higher and the injection time is shorter than the pressure of the fuel injected by the intake passage injector. In addition, the amount of fuel injected from the in-cylinder injector is determined by the minimum driving time (clipped), and the air / fuel ratio is caused by the case where the fuel injected from the intake passage injector is attached fuel. May deviate from the stoichiometric value, the so-called “Stoichimetric Air”, and become rich or lean.

したがって、吸気通路インジェクタのみから燃料噴射が行われる運転状態を吸気通路インジェクタ及び筒内インジェクタを併用して燃料噴射が行われる運転状態へ切り換わる場合、吸気通路インジェクタ及び筒内インジェクタを併用して燃料噴射が行われる運転状態から筒内インジェクタのみから燃料噴射が行われる運転状態へ切り換わる場合、またはこれらの逆の場合など、燃料噴射の比率を変化させる際、排ガス中のＨＣ（炭化水素）やＮＯｘが増えてしまうことが懸念される。   Therefore, when the operation state in which fuel injection is performed only from the intake passage injector is switched to the operation state in which fuel injection is performed by using both the intake passage injector and the in-cylinder injector, the fuel is injected using the intake passage injector and the in-cylinder injector together. When changing from the operating state where injection is performed to the operating state where fuel injection is performed only from the in-cylinder injector, or vice versa, when changing the ratio of fuel injection, HC (hydrocarbon) in exhaust gas or There is a concern that NOx will increase.

そこで、吸気通路インジェクタと筒内インジェクタがそれぞれ噴射する燃料の量の比率を変えても排ガス中のＨＣやＮＯｘが著しく増えない噴射制御を行うエンジンを提供する。   Therefore, an engine is provided that performs injection control in which HC and NOx in the exhaust gas do not increase remarkably even if the ratio of the amount of fuel injected by each of the intake passage injector and the in-cylinder injector is changed.

本発明に係る一実施形態のエンジンは、吸気ポートへ燃料を噴射する吸気通路インジェクタ及び筒内へ燃料を噴射する筒内インジェクタを複数の気筒のそれぞれに有し、エンジンの運転状態に合わせて各気筒の燃料の噴射モードを、吸気通路モード、吸気通路＋筒内モード、筒内モード、の３つの噴射モードに切り換え可能な制御装置を備える。吸気通路モードでは、吸気通路インジェクタのみから燃料を噴射する。吸気通路＋筒内モードでは、吸気通路インジェクタ及び筒内インジェクタに燃料を分配して噴射する。筒内モードでは、筒内インジェクタのみから燃料を噴射する。そして、制御装置は、複数の気筒を少なくとも２つの群に分け、１つの群の噴射モードを切り換える間、残りの群の噴射モードをそれまでの噴射モードに維持するように各群の噴射モードを順番に切り換える。このとき、吸気通路モードから吸気通路＋筒内モードへ噴射モードを切り換える場合、および、吸気通路＋筒内モードから吸気通路モードへ噴射モードを切り換える場合、各群には１つの気筒をそれぞれ含み、吸気通路＋筒内モードから筒内モードへ噴射モードを切り換える場合、および、筒内モードから吸気通路＋筒内モードへ噴射モードを切り換える場合、各群には点火順序が連続しない少なくとも２つの気筒をそれぞれ含む。 An engine according to an embodiment of the present invention has an intake passage injector that injects fuel into an intake port and an in-cylinder injector that injects fuel into a cylinder in each of a plurality of cylinders. comprises injection mode of cylinders of the fuel intake passage mode, the intake passage + cylinder mode, the cylinder mode, the control device capable of switching to the three injection modes. In the intake passage mode, fuel is injected only from the intake passage injector. In the intake passage + in-cylinder mode, fuel is distributed and injected to the intake passage injector and the in-cylinder injector. In the in-cylinder mode, fuel is injected only from the in-cylinder injector. Then, the control device divides the plurality of cylinders into at least two groups and switches the injection mode of each group so that the injection mode of the remaining group is maintained at the previous injection mode while switching the injection mode of one group. Switch in order. At this time, when the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode, and when the injection mode is switched from the intake passage + in-cylinder mode to the intake passage mode, each group includes one cylinder, When switching the injection mode from the intake passage + in-cylinder mode to the in-cylinder mode and when switching the injection mode from the in-cylinder mode to the intake passage + in-cylinder mode, each group includes at least two cylinders whose ignition order is not continuous. Includes each.

このとき、制御装置は、１つの群の噴射モードの切り替えを完了した後、次の群の噴射モードの切り換えを開始するまで、一定の時間を空ける。 At this time, the control device, after completing the switching of the injection mode of the one group, to the start of switching of the injection mode of the next group, Ru at a certain time.

本発明に係るエンジンによれば、複数の気筒を少なくとも２つの群に分け、１つの群の噴射モードを切り換える間、残りの群の噴射モードを維持するので、噴射モードを切り換えている群の気筒の燃焼状態がストイキから外れてリッチ又はリーンになったとしても、残りの群の気筒の燃焼状態がストイキに維持されている。したがって、噴射モードを切り換える間、エンジンの出力は安定しているとともに、エンジンから排出される排ガス中のＨＣ濃度またはＮＯｘ濃度も低く抑えることができる。触媒などを使用した排ガスの浄化処理にかかる負荷を軽減できる。   According to the engine of the present invention, the plurality of cylinders are divided into at least two groups, and while the injection mode of one group is switched, the remaining group injection modes are maintained. Even if the combustion state of the cylinder is deviated from the stoichiometric state and becomes rich or lean, the combustion state of the remaining groups of cylinders is maintained at the stoichiometric state. Therefore, while switching the injection mode, the output of the engine is stable, and the HC concentration or NOx concentration in the exhaust gas discharged from the engine can be kept low. The load on the exhaust gas purification process using a catalyst or the like can be reduced.

また、１つの群の噴射モードの切り替えを完了した後、次の群の噴射モードの切り換えを開始するまで、一定の時間を空ける発明に係るエンジンによれば、エンジン出力が安定しやすく、噴射モードを切り換えている間に発生したＨＣやＮＯｘは、噴射モードの切り替えが行われていない間に排出される排気ガスによってさらに希釈される。   In addition, according to the engine according to the invention in which a certain period of time is left after the switching of the injection mode of one group is completed until the switching of the injection mode of the next group is started, the engine output is easily stabilized, and the injection mode The HC and NOx generated during the switching are further diluted by the exhaust gas discharged while the injection mode is not switched.

また、１つの群に１つの気筒を含む発明に係るエンジンによれば、１気筒ずつ噴射モードが切り替わるので、他の場合と同様にエンジンの出力が安定しやすく排ガス中のＨＣ及びＮＯｘの濃度を低く抑えることができる。   Further, according to the engine according to the invention including one cylinder in one group, the injection mode is switched one cylinder at a time, so that the output of the engine is easily stabilized as in other cases, and the concentrations of HC and NOx in the exhaust gas are reduced. It can be kept low.

また、点火順序が連続しない少なくとも２つの気筒を１つの群に含む発明に係るエンジンによれば、噴射モードを切り換えている間のエンジン出力が乱れにくく、また、ＨＣまたはＮＯｘが発生した場合に噴射モードを切り換えている２つの気筒の間で点火されてストイキ運転を続けている気筒から排出される排気ガスによって希釈される。したがって、エンジンから排出される排ガス中のＨＣやＮＯｘの濃度に斑が生じにくいため、触媒などによる排ガスの浄化処理に対する負荷が軽減される。   Further, according to the engine according to the invention including at least two cylinders in which the ignition order is not continuous in one group, the engine output is hardly disturbed while the injection mode is switched, and the injection is performed when HC or NOx is generated. It is diluted by the exhaust gas that is ignited between the two cylinders that are switching modes and that is exhausted from the cylinder that continues the stoichiometric operation. Therefore, since the spots of HC and NOx in the exhaust gas discharged from the engine are less likely to be uneven, the burden on the exhaust gas purification process by the catalyst or the like is reduced.

吸気通路モードから吸気通路＋筒内モードへ噴射モードを切り換える場合、および、吸気通路＋筒内モードから吸気通路モードへ噴射モードを切り換える場合、１つの群に１つの気筒を含み、制御装置が順番に各群の噴射モードを切り換える発明に係るエンジンによれば、噴射モードを切り換えられる気筒は常に１つであるので、噴射モードを切り換えている気筒の燃焼状態がストイキから外れても、全体で見たときの変動は小さい。筒内インジェクタから噴射される燃料の圧力は高いため、最小駆動時間で一度に噴射される燃料の量が多く、テーリング制御を行なっても、最小駆動時間で噴射される燃料の量よりも少ない量の調整ができない。つまり、筒内インジェクタから噴射される燃料の量の割合が小さい段階において、その影響が燃焼状態に表れやすい。この発明の場合、１気筒ずつ噴射モードを切り換えるので、この気筒がストイキから外れてＨＣやＮＯｘを発生させる量は、エンジン全体の排ガス量から比べれば、充分に小さい。したがって、触媒などを使用した排ガスの浄化処理に係る負荷は小さい。   When the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode, and when the injection mode is switched from the intake passage + in-cylinder mode to the intake passage mode, one group includes one cylinder, and the control device sequentially According to the engine according to the invention for switching the injection mode of each group, the number of cylinders to which the injection mode can be switched is always one. Therefore, even if the combustion state of the cylinder for which the injection mode is switched is out of stoichiometry, The fluctuation at the time is small. Because the pressure of the fuel injected from the in-cylinder injector is high, the amount of fuel injected at a time in the minimum drive time is large, and even if tailing control is performed, the amount is less than the amount of fuel injected in the minimum drive time Cannot be adjusted. That is, at the stage where the ratio of the amount of fuel injected from the in-cylinder injector is small, the influence tends to appear in the combustion state. In the case of the present invention, since the injection mode is switched one cylinder at a time, the amount by which this cylinder is removed from the stoichiometry and generates HC and NOx is sufficiently small compared to the exhaust gas amount of the entire engine. Therefore, the load related to the purification treatment of exhaust gas using a catalyst or the like is small.

また、吸気通路＋筒内モードから筒内モードへ噴射モードを切り換える場合、および、筒内モードから吸気通路＋筒内モードへ噴射モードを切り換える場合、点火順序が連続しない少なくとも２つの気筒を１つの群に含み、制御装置が順番に各群の噴射モードを切り換える発明に係るエンジンによれば、２つの気筒が同時期に噴射モードを切り換えられるので、エンジン全体の噴射モードの切り換えが早く完了する。筒内インジェクタに比べた吸気通路インジェクタから噴射される燃料の圧力は低く、最小駆動時間で一度に噴射される燃料の量が少ない。また、筒内モードにおいて噴射される燃料量は、吸気通路＋筒内モードにおいて噴射される燃料量よりも多い。すなわち、吸気通路インジェクタから噴射される燃料量の誤差による影響は、極めて小さい。１つの群に含まれる２つの気筒の噴射モードを同時期に切り換えても、これらの気筒がストイキから外れてＨＣやＮＯｘを発生する量は、エンジン全体の排ガス量から比べれば充分に小さい。したがって、触媒などを使用した排ガスの浄化処理に係る負荷は小さい。   Further, when switching the injection mode from the intake passage + in-cylinder mode to the in-cylinder mode, and when switching the injection mode from the in-cylinder mode to the intake passage + in-cylinder mode, at least two cylinders whose ignition order is not continuous are set to one According to the engine according to the invention that is included in the group and in which the control device sequentially switches the injection mode of each group, since the two cylinders can switch the injection mode at the same time, the switching of the injection mode of the entire engine is completed quickly. The pressure of the fuel injected from the intake passage injector is lower than that of the in-cylinder injector, and the amount of fuel injected at a time in the minimum driving time is small. The amount of fuel injected in the in-cylinder mode is larger than the amount of fuel injected in the intake passage + in-cylinder mode. That is, the influence of the error in the amount of fuel injected from the intake passage injector is extremely small. Even if the injection modes of the two cylinders included in one group are switched at the same time, the amount of these cylinders that deviate from the stoichiometry and generate HC and NOx is sufficiently small compared to the exhaust gas amount of the entire engine. Therefore, the load related to the purification treatment of exhaust gas using a catalyst or the like is small.

本発明に係る一実施形態のエンジンを示す概略図。1 is a schematic diagram showing an engine according to an embodiment of the present invention. 図１のエンジンに設定された燃料噴射モードの分布領域を示す図。The figure which shows the distribution area | region of the fuel-injection mode set to the engine of FIG. 図２中の吸気通路モードから吸気通路＋筒内モードに移行するときのタイムチャート。FIG. 3 is a time chart when a transition is made from an intake passage mode in FIG. 2 to an intake passage + in-cylinder mode. 図２中の吸気通路＋筒内モードから筒内モードに移行するときのタイムチャート。FIG. 3 is a time chart when shifting from the intake passage + in-cylinder mode to the in-cylinder mode in FIG. 2. 図１のエンジンの制御装置によって噴射モードを切り換えるためのフローチャート。The flowchart for switching injection mode by the engine control apparatus of FIG.

本発明に係る一実施形態のエンジン１０について、図１から図５を参照して説明する。図１に示すエンジン１０は、例えば直列４気筒のエンジンである。図１には１つの気筒２をピストン２５のストロークに沿う平面で切った断面を示す。このエンジン１０は、シリンダブロック２１、シリンダヘッド２２、吸気通路２３、排気通路２４、ピストン２５、吸気バルブ２３１、排気バルブ２４１、点火プラグ２６、吸気通路インジェクタ３１、筒内インジェクタ３２、制御装置（Electric Control Unit:ＥＣＵ）４、燃料タンク５、供給ポンプ５１、高圧ポンプ５２を備える。吸気バルブ２３１によって塞がれた吸気通路２３の端部に、吸気ポート２３Ａが形成される。また、排気バルブ２４１によって塞がれた排気通路２４の端部に、排気ポート２４Ａが形成される。排気通路２４は、排ガスを浄化処理するための触媒２４２を下流に備えている。   An engine 10 according to an embodiment of the present invention will be described with reference to FIGS. An engine 10 shown in FIG. 1 is, for example, an in-line four-cylinder engine. FIG. 1 shows a cross section of one cylinder 2 cut by a plane along the stroke of the piston 25. The engine 10 includes a cylinder block 21, a cylinder head 22, an intake passage 23, an exhaust passage 24, a piston 25, an intake valve 231, an exhaust valve 241, a spark plug 26, an intake passage injector 31, an in-cylinder injector 32, a control device (Electric Control Unit: ECU) 4, fuel tank 5, supply pump 51, and high-pressure pump 52. An intake port 23 </ b> A is formed at the end of the intake passage 23 that is blocked by the intake valve 231. An exhaust port 24A is formed at the end of the exhaust passage 24 that is blocked by the exhaust valve 241. The exhaust passage 24 includes a catalyst 242 for purifying exhaust gas downstream.

吸気通路インジェクタ３１は、各気筒２の吸気ポート２３Ａの上流の吸気通路２３に設置され、吸気ポート２３Ａに向けて燃料を噴射する。筒内インジェクタ３２は、シリンダヘッド２２に設置され、各気筒２の筒内へ燃料を噴射する。吸気通路インジェクタ３１は、燃料タンク５から供給ポンプ５１によって燃料が供給される。筒内インジェクタ３２は、供給ポンプ５１によって送り出された燃料の一部をさらに高圧ポンプ５２によって加圧した燃料が供給される。   The intake passage injector 31 is installed in the intake passage 23 upstream of the intake port 23A of each cylinder 2, and injects fuel toward the intake port 23A. The in-cylinder injector 32 is installed in the cylinder head 22 and injects fuel into the cylinder of each cylinder 2. The intake passage injector 31 is supplied with fuel from a fuel tank 5 by a supply pump 51. The in-cylinder injector 32 is supplied with fuel obtained by further pressurizing a part of the fuel sent out by the supply pump 51 by the high-pressure pump 52.

制御装置４は、エンジン１０の運転状態を検出するために、各所に配置されたセンサに接続されている。センサとして、エアーフローメータ、空燃比センサ、圧力センサ、クランク角センサ４１、冷却水温センサ４２、アクセル開度センサ４３、速度計などが含まれる。エンジン回転数は、クランク角センサ４１が出力する信号から算出されてもよいし、別途、回転計（タコメータ）を装備してもよい。また、制御装置４は、さらに、点火プラグ２６、スロット弁、吸気通路インジェクタ３１、筒内インジェクタ３２、供給ポンプ５１、高圧ポンプ５２にも接続されている。   The control device 4 is connected to sensors arranged at various places in order to detect the operating state of the engine 10. Examples of the sensor include an air flow meter, an air-fuel ratio sensor, a pressure sensor, a crank angle sensor 41, a coolant temperature sensor 42, an accelerator opening sensor 43, and a speedometer. The engine speed may be calculated from a signal output from the crank angle sensor 41, or a tachometer may be separately provided. The control device 4 is further connected to a spark plug 26, a slot valve, an intake passage injector 31, an in-cylinder injector 32, a supply pump 51, and a high pressure pump 52.

この制御装置４は、エンジン１０の運転状態に合わせて各気筒２の燃料の噴射モードを、吸気通路モード、吸気通路＋筒内モード、筒内モード、のいずれかに切り換える。吸気通路モードでは、吸気通路インジェクタ３１のみから燃料を噴射する。吸気通路＋筒内モードでは、吸気通路インジェクタ３１及び筒内インジェクタ３２のそれぞれに燃料を分配して噴射する。吸気通路インジェクタ３１及び筒内インジェクタ３２に割り当てられる燃料の比率は、運転状態に応じて決定される。筒内モードでは、筒内インジェクタ３２のみから燃料を噴射する。   The control device 4 switches the fuel injection mode of each cylinder 2 to one of an intake passage mode, an intake passage + in-cylinder mode, and an in-cylinder mode in accordance with the operating state of the engine 10. In the intake passage mode, fuel is injected only from the intake passage injector 31. In the intake passage + in-cylinder mode, fuel is distributed and injected to each of the intake passage injector 31 and the in-cylinder injector 32. The ratio of the fuel allocated to the intake passage injector 31 and the in-cylinder injector 32 is determined according to the operating state. In the in-cylinder mode, fuel is injected only from the in-cylinder injector 32.

エンジン１０の運転状態としてエンジン回転数及びエンジン負荷を条件とする場合の各噴射モードの領域を図２に示す。図２によれば、吸気通路モードは、エンジン回転数によらず、エンジン負荷が小さい領域に設定されている。筒内モードは、エンジン回転数が高く、かつエンジン負荷も高い領域に設定されている。吸気通路＋筒内モードは、吸気通路モードと筒内モードの間の領域に設定される。吸気通路インジェクタ３１と筒内インジェクタ３２からそれぞれ噴射される燃料量は、条件に応じて数段階にあるいは無段階に変更される。   FIG. 2 shows the regions of the respective injection modes when the engine speed and the engine load are used as the operating state of the engine 10. According to FIG. 2, the intake passage mode is set to a region where the engine load is small irrespective of the engine speed. The in-cylinder mode is set in a region where the engine speed is high and the engine load is high. The intake passage + in-cylinder mode is set in a region between the intake passage mode and the in-cylinder mode. The amount of fuel injected from each of the intake passage injector 31 and the in-cylinder injector 32 is changed in several steps or steplessly depending on conditions.

制御装置４は、エンジン１０の運転状態が噴射モードの各領域を超えて変化した場合、すべての気筒２の噴射モードを同時期に変更せず、複数ある気筒２を少なくとも２つの群に分け、１つの群の噴射モードを切り換える間、残りの群の噴射モードをそれまでの噴射モードに維持する。本実施形態では、エンジン１０は、直列４気筒であって、＃１の気筒２からクランクシャフトに沿って＃２の気筒２、＃３の気筒２、＃４の気筒２の順に並んで設置されており、＃１→＃３→＃４→＃２の順に点火されるように各気筒２の各行程が設定されている。   When the operating state of the engine 10 changes beyond each region of the injection mode, the control device 4 does not change the injection mode of all the cylinders 2 at the same time, and divides the plurality of cylinders 2 into at least two groups, While switching the injection mode of one group, the injection mode of the remaining groups is maintained at the previous injection mode. In the present embodiment, the engine 10 is an in-line four cylinder, and is installed along the crankshaft from the # 1 cylinder 2 in the order of the # 2 cylinder 2, the # 3 cylinder 2, and the # 4 cylinder 2. Each stroke of each cylinder 2 is set so that ignition is performed in the order of # 1 → # 3 → # 4 → # 2.

１つの群は、例えば図３に示すように１つの気筒２を含むように構成されるか、または例えば図４に示すように点火順序が連続しない２つの気筒２を含むように構成される。図４において、＃１と＃４の気筒２、＃３と＃２の気筒２がそれぞれ１つの群である。また、制御装置４は、図３及び図４に示すように、１つの群の噴射モードの切り換えが完了した後、次の群の噴射モードの切り換えを開始するまで、一定の時間を空ける、すなわち、噴射モードの切り換えを行わない禁止行程（待機行程）ＸＩＧを設ける。   One group is configured to include one cylinder 2 as shown in FIG. 3, for example, or is configured to include two cylinders 2 whose ignition order is not continuous as shown in FIG. 4, for example. In FIG. 4, cylinders # 1 and # 4 and cylinders # 3 and # 2 are each one group. Further, as shown in FIGS. 3 and 4, the control device 4 waits for a certain period of time until the switching of the injection mode of the next group is started after the switching of the injection mode of one group is completed, that is, A prohibition stroke (standby stroke) XIG that does not switch the injection mode is provided.

この制御装置４は、吸気通路モードから吸気通路＋筒内モードに噴射モードを切り換える場合、図３に示すように、各群に含まれる気筒２を１つとし、各群の噴射モードを順番に切り換える。図３に示された一例では、点火順序に従って、＃１→＃３→＃４→＃２の順に噴射モードを切り換えている。また、吸気通路＋筒内モードから吸気通路モードに噴射モードを切り換える場合も同様に、各群に含まれる気筒２を１つとし、点火順序に従って噴射モードを順番に切り換える。   When the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode, the control device 4 uses one cylinder 2 included in each group as shown in FIG. Switch. In the example shown in FIG. 3, the injection modes are switched in the order of # 1 → # 3 → # 4 → # 2 in accordance with the ignition order. Similarly, when the injection mode is switched from the intake passage + in-cylinder mode to the intake passage mode, the number of cylinders 2 included in each group is one, and the injection mode is switched in order according to the ignition order.

噴射モードを切り換える気筒２の順番は、点火順序にしたがっていなくてもよく、すべての気筒２が順番に切り換えられれば、噴射モードの切り換えが必要となった時点で最もタイミングの良い気筒から、ランダムに噴射モードが切り換えられてもよい。噴射モードを切り換える際は、テーリング制御によって、吸気通路モードから吸気通路＋筒内モードへ徐々に移行する。吸気通路＋筒内モードから吸気通路モードに切換えられる場合も同様である。   The order of the cylinders 2 for switching the injection mode does not have to follow the ignition order. If all the cylinders 2 are switched in order, the cylinders with the best timing at the time when switching of the injection modes is required are randomly selected. The injection mode may be switched. When switching the injection mode, the intake passage mode is gradually shifted from the intake passage mode to the in-cylinder mode by tailing control. The same applies when switching from the intake passage + in-cylinder mode to the intake passage mode.

制御装置４は、吸気通路＋筒内モードから筒内モードに噴射モードを切り換える場合、図４に示すように、各群に含まれる気筒２を点火順序が連続しない２つの気筒２とし、各群の噴射モードを順番に切り換える。図４に示された一例では、＃１と＃４の気筒２が同時期に筒内モードから吸気通路＋筒内モードへ切り換えられ、その後、禁止行程ＸＩＧを経てから、＃３と＃２の気筒２の噴射モードを同時期に切り換えている。
When switching the injection mode from the intake passage + in- cylinder mode to the in-cylinder mode, the control device 4 sets the cylinders 2 included in each group to two cylinders 2 in which the firing order is not continuous, as shown in FIG. Are switched in order. In the example shown in FIG. 4, the cylinders # 1 and # 4 are switched from the in-cylinder mode to the intake passage + in- cylinder mode at the same time, and after passing through the prohibition stroke XIG, The injection mode of cylinder 2 is switched to the same period.

以上のように機能する制御装置４の燃料噴射制御における噴射モードの切り換えについて、図５に示すフローチャートを基に以下に説明する。図５に示すように、制御装置４は、現在の噴射モードが何であるか確認するために、吸気通路モードであるか判断（Ｓ１）し、違う場合は吸気通路＋筒内モードであるか判断（Ｓ２）し、さらに違う場合は筒内モードであると判断（Ｓ３）する。吸気通路モードである場合、吸気通路＋筒内モードに切換えるかエンジン回転数、エンジン負荷、冷却水温度などの運転条件（Ｓ４）を基に判断（Ｓ５）する。切り換える必要が無い場合は、制御装置４は、そのままの噴射モードを維持し噴射モード切り換え制御を終了する。   The switching of the injection mode in the fuel injection control of the control device 4 functioning as described above will be described below based on the flowchart shown in FIG. As shown in FIG. 5, in order to confirm what the current injection mode is, the control device 4 determines whether it is the intake passage mode (S1), and if not, determines whether it is the intake passage + in-cylinder mode. (S2) If it is further different, it is determined that the in-cylinder mode is selected (S3). If it is in the intake passage mode, a determination is made (S5) based on operating conditions (S4) such as switching to the intake passage + in-cylinder mode or engine speed, engine load, coolant temperature, and the like. If there is no need to switch, the control device 4 maintains the injection mode as it is and ends the injection mode switching control.

Ｓ５の判断の結果、燃料噴射モードを切り換える必要がある場合、図３に示したように、＃１の気筒２から順番に噴射モードを吸気通路モードから吸気通路＋筒内モードへ切り換え（Ｓ６）る。＃１の気筒２の噴射モードが吸気通路モードから吸気通路＋筒内モードに切り換わるまで、他の気筒２、この場合は、＃３、＃４、＃２の気筒２の噴射モードは、吸気通路モードに維持されている。＃１の気筒２の噴射モードが吸気通路＋筒内モードに切り換わると、次に＃３の気筒２の噴射モードを吸気通路モードから吸気通路＋筒内モードに切り換える前に、いずれの気筒２も噴射モードを切り換えない禁止行程ＸＩＧ（Ｓ７）を一定時間設ける。禁止行程ＸＩＧ（Ｓ７）が完了すると、＃３の気筒２の噴射モードを吸気通路モードから吸気通路＋筒内モードに切り換え（Ｓ８）る。＃３の気筒２の噴射モードが切り換わるまで、他の気筒２、この場合は、＃１、＃４、＃２の気筒２の噴射モードは、＃３の気筒２の噴射モードを切り換える前のまま維持される。つまり＃１の気筒２は、吸気通路＋筒内モード、＃４と＃２の気筒２は、吸気通路モードに保持される。   As a result of the determination in S5, when it is necessary to switch the fuel injection mode, as shown in FIG. 3, the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode in order from the cylinder # 2 (S6). The Until the injection mode of the # 2 cylinder 2 is switched from the intake passage mode to the intake passage + in-cylinder mode, the other cylinders 2, in this case, the injection modes of the # 2, # 4, and # 2 cylinders 2 The passage mode is maintained. When the injection mode of the cylinder # 2 is switched to the intake passage + in-cylinder mode, any cylinder 2 is switched before the injection mode of the cylinder # 3 is switched from the intake passage mode to the intake passage + in-cylinder mode. Also, a prohibition stroke XIG (S7) that does not switch the injection mode is provided for a certain period of time. When the forbidden stroke XIG (S7) is completed, the injection mode of the # 2 cylinder 2 is switched from the intake passage mode to the intake passage + in-cylinder mode (S8). Until the injection mode of the cylinder 2 of # 3 is switched, the injection mode of the other cylinder 2, in this case, the cylinder 2 of # 1, # 4, and # 2, is before the injection mode of the cylinder 2 of # 3 is switched. Maintained. That is, the # 1 cylinder 2 is held in the intake passage + in-cylinder mode, and the # 4 and # 2 cylinders 2 are held in the intake passage mode.

＃３の気筒２の噴射モードが切り換わると、＃１の気筒２の噴射モードを切り換えた後と同様に禁止行程ＸＩＧ（Ｓ９）が設けられ、＃４の気筒２の噴射モードの切り換え（Ｓ１０）、禁止行程ＸＩＧ（Ｓ１１）、＃２の気筒２の噴射モードの切り換え（Ｓ１２）という具合に、各気筒２の噴射モードを切り換える行程（Ｓ６とＳ８、Ｓ８とＳ１０、Ｓ１０とＳ１２）の間にそれぞれ禁止行程ＸＩＧ（Ｓ７、Ｓ９、Ｓ１１）を設けている。   When the injection mode of the # 2 cylinder 2 is switched, the prohibition stroke XIG (S9) is provided in the same manner as after the injection mode of the # 1 cylinder 2 is switched, and the injection mode of the # 4 cylinder 2 is switched (S10). ), Forbidden stroke XIG (S11), switching of injection mode of cylinder 2 of # 2 (S12), etc., during the stroke of switching the injection mode of each cylinder 2 (S6 and S8, S8 and S10, S10 and S12) Are respectively provided with prohibition strokes XIG (S7, S9, S11).

Ｓ２において、吸気通路＋筒内モードであると判定された場合、吸気通路モードに切り換えるかエンジン回転数、エンジン負荷、冷却水温度などの運転条件（Ｓ１３）を基に判断（Ｓ１４）し、切り換える必要がある場合は、Ｓ６〜Ｓ１２と同様に＃１の気筒２から点火順序に従って、禁止行程ＸＩＧを間に挟みながら、＃３、＃４、＃２の気筒２を順番に吸気通路＋筒内モードから吸気通路モードに切り換え（Ｓ１５〜Ｓ２１）る。   If it is determined in S2 that the intake passage + in-cylinder mode is selected, the mode is switched to the intake passage mode or is determined (S14) based on the operating conditions (S13) such as the engine speed, engine load, and coolant temperature. If necessary, the cylinders # 3, # 4, and # 2 are sequentially placed in the intake passage + in-cylinder while interposing the forbidden stroke XIG in accordance with the ignition sequence from the cylinder # 2 as in S6 to S12. The mode is switched to the intake passage mode (S15 to S21).

Ｓ１４において、吸気通路＋筒内モードから吸気通路モードに切り換えない判断がされた場合、さらに吸気通路＋筒内モードから筒内モードに切換えるか判断（Ｓ２２）される。Ｓ２２において筒内モードに切り換える判断がされると、図４に示したように、点火順序が連続しない２つの気筒２、この場合、＃１と＃４の気筒２の噴射モードを吸気通路＋筒内モードから筒内モードへ同時期に切り換え（Ｓ２３）る。そして、噴射モードを切り換えない禁止行程ＸＩＧ（Ｓ２４）を間に挟んで、残りの気筒である＃３と＃２の気筒２の噴射モードを吸気通路＋筒内モードから筒内モードへ同時期に切り換え（Ｓ２５）る。Ｓ２において吸気通路＋筒内モードであると判断されたのち、Ｓ１４で吸気通路モードに切り換えないし、Ｓ２２で筒内モードにも切り換えないと判断された場合、制御装置４は、吸気通路＋筒内モードに噴射モードをそのまま維持し、噴射モード切り換え制御を終了する。   If it is determined in S14 that the intake passage + in-cylinder mode is not switched to the intake passage mode, it is further determined whether the intake passage + in-cylinder mode is switched to the in-cylinder mode (S22). If it is determined in S22 that the mode is switched to the in-cylinder mode, as shown in FIG. 4, the injection modes of the two cylinders 2 in which the ignition order is not continuous, in this case, the cylinders 2 of # 1 and # 4, are changed to the intake passage + cylinder. The inner mode is switched to the in-cylinder mode at the same time (S23). The injection mode of the remaining cylinders # 3 and # 2 is changed from the intake passage + in-cylinder mode to the in-cylinder mode at the same time with the prohibition stroke XIG (S24) not switching the injection mode in between. Switch (S25). If it is determined in S2 that the intake passage + in-cylinder mode is selected, and if it is determined in S14 that the intake passage mode is not switched or the in-cylinder mode is not switched in S22, the control device 4 The injection mode is maintained in the mode, and the injection mode switching control is terminated.

また、筒内モードであるＳ３と判定された場合、吸気通路＋筒内モードに切り換えるかエンジン回転数、エンジン負荷、冷却水温度等の運転条件（Ｓ２６）を基に判断（Ｓ２７）する。噴射モードを切り換える必要があると判断された場合、Ｓ２３〜Ｓ２５と同様に＃１と＃４の気筒２の噴射モードを筒内モードから吸気通路＋筒内モードに切り換え（Ｓ２８）、禁止行程ＸＩＧ（Ｓ２９）を間に挟んで、＃３と＃２の気筒２の噴射モードを筒内モードから吸気通路＋筒内モードに切り換え（Ｓ３０）る。Ｓ２７において噴射モードを筒内モードから切り換えないと判断された場合は、筒内モードを維持したまま噴射モード切り換え制御を終了する。   If it is determined that the in-cylinder mode is S3, a determination is made (S27) based on the operating conditions (S26) such as the engine speed, the engine load, the coolant temperature, etc. When it is determined that it is necessary to switch the injection mode, the injection mode of the cylinders # 1 and # 4 is switched from the in-cylinder mode to the intake passage + in-cylinder mode (S28) as in S23 to S25, and the prohibition process XIG With the (S29) in between, the injection mode of the cylinders # 3 and # 2 is switched from the in-cylinder mode to the intake passage + in-cylinder mode (S30). If it is determined in S27 that the injection mode is not switched from the in-cylinder mode, the injection mode switching control is terminated while maintaining the in-cylinder mode.

本実施形態ではエンジン１０が直列４気筒であり、吸気通路モードから吸気通路＋筒内モードへまたはその逆へ噴射モードを切り換える場合、１つの群に含まれる気筒２の数を１つとし、吸気通路＋筒内モードから筒内モードへまたはその逆へ噴射モードを切り換える場合、１つの群に含まれる気筒２の数を２つとしている。吸気通路インジェクタ及び筒内インジェクタの最小駆動時間や排気通路２４に設置される触媒２４２の浄化処理能力に応じて、１つの群に含まれる気筒の数は適宜変更される。例えば、１つの群に２つ以上の気筒を含んだ複数の群に分け、吸気通路モードから吸気通路＋筒内モードに切り換えるまたはその逆へ噴射モードを切り換えてもよいし、１つの群に１つの気筒を含み、吸気通路＋筒内モードから筒内モードへまたはその逆へ噴射モードを切り換えてもよい。   In this embodiment, when the engine 10 is an in-line four cylinder and the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode or vice versa, the number of cylinders 2 included in one group is one, When the injection mode is switched from the passage + in-cylinder mode to the in-cylinder mode or vice versa, the number of cylinders 2 included in one group is two. The number of cylinders included in one group is appropriately changed according to the minimum drive time of the intake passage injector and the in-cylinder injector and the purification processing capability of the catalyst 242 installed in the exhaust passage 24. For example, it may be divided into a plurality of groups each including two or more cylinders in one group, and the injection mode may be switched from the intake passage mode to the intake passage + in-cylinder mode or vice versa. One cylinder may be included, and the injection mode may be switched from the intake passage + in-cylinder mode to the in-cylinder mode or vice versa.

また、直列６気筒、Ｖ型６気筒、Ｖ型８気筒など気筒数が多いエンジンの場合には、噴射モードの切り換えを同時に実施しない群の数を増やしてもよいし、１つの群に含まれる気筒の数を増やしてもよい。その場合、好ましくは、点火順序が連続しない気筒どうしを１つの群に含むものとする。   Further, in the case of an engine having a large number of cylinders such as in-line 6 cylinders, V-type 6 cylinders, and V-type 8 cylinders, the number of groups that do not simultaneously switch the injection mode may be increased or included in one group. The number of cylinders may be increased. In that case, it is preferable that cylinders whose ignition order is not continuous are included in one group.

１０…エンジン、２…気筒、４…制御装置、２３Ａ…吸気ポート、３１…吸気通路インジェクタ、３２…筒内インジェクタ、ＸＩＧ…禁止行程。   DESCRIPTION OF SYMBOLS 10 ... Engine, 2 ... Cylinder, 4 ... Control apparatus, 23A ... Intake port, 31 ... Intake passage injector, 32 ... In-cylinder injector, XIG ... Prohibited stroke

Claims (2)

吸気管へ燃料を噴射する吸気通路インジェクタ及び筒内へ燃料を噴射する筒内インジェクタを複数の気筒のそれぞれに有したエンジンであって、
前記エンジンの運転状態に合わせて各気筒の燃料の噴射モードを、前記吸気通路インジェクタのみから燃料を噴射する吸気通路モード、前記吸気通路インジェクタ及び前記筒内インジェクタに燃料を分配して噴射する吸気通路＋筒内モード、前記筒内インジェクタのみから燃料を噴射する筒内モードの３つの噴射モードに切り換え可能な制御装置を備え、
前記制御装置は、複数の前記気筒を少なくとも２つの群に分け、１つの群の噴射モードを切り換える間、残りの群の噴射モードをそれまでの噴射モードに維持するようにそれぞれの前記群の前記噴射モードを順番に切り換えるものであって、
前記吸気通路モードから前記吸気通路＋筒内モードへ前記噴射モードを切り換える場合、および、前記吸気通路＋筒内モードから前記吸気通路モードへ前記噴射モードを切り換える場合、前記群は、１つの前記気筒をそれぞれ含み、
前記吸気通路＋筒内モードから前記筒内モードへ前記噴射モードを切り換える場合、および、前記筒内モードから前記吸気通路＋筒内モードへ前記噴射モードを切り換える場合、前記群は、点火順序が連続しない少なくとも２つの気筒をそれぞれ含む
ことを特徴とするエンジン。 An engine having an intake passage injector for injecting fuel into the intake pipe and an in-cylinder injector for injecting fuel into the cylinder in each of the plurality of cylinders,
The fuel injection mode of each cylinder according to the operating state of the engine, the intake passage mode in which fuel is injected only from the intake passage injector, and the intake passage in which fuel is distributed and injected to the intake passage injector and the in-cylinder injector + cylinder mode, a control device capable of switching to the three injection mode of the in-cylinder mode for injecting fuel only from the in-cylinder injector,
The control device divides the plurality of cylinders into at least two groups, and switches the injection mode of one group while maintaining the injection mode of the remaining group in the previous injection mode while switching the injection mode of one group. It switches the injection mode in order,
When the injection mode is switched from the intake passage mode to the intake passage + in-cylinder mode, and when the injection mode is switched from the intake passage + in-cylinder mode to the intake passage mode, the group is one cylinder. Each
When the injection mode is switched from the intake passage + in-cylinder mode to the in-cylinder mode, and when the injection mode is switched from the in-cylinder mode to the intake passage + in-cylinder mode, the group has a continuous ignition sequence. An engine characterized by comprising at least two cylinders each not . 前記制御装置は、１つの群の噴射モードの切り換えを完了した後、次の群の噴射モードの切り換えを開始するまで、一定の時間を空ける
ことを特徴とする請求項１に記載されたエンジン。 2. The engine according to claim 1, wherein after the switching of the injection mode of one group is completed, the control device waits for a certain period of time until the switching of the injection mode of the next group is started.
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