WO2011117970A1 - Internal combustion engine with exhaust gas recirculation device - Google Patents

Internal combustion engine with exhaust gas recirculation device Download PDF

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Publication number
WO2011117970A1
WO2011117970A1 PCT/JP2010/054976 JP2010054976W WO2011117970A1 WO 2011117970 A1 WO2011117970 A1 WO 2011117970A1 JP 2010054976 W JP2010054976 W JP 2010054976W WO 2011117970 A1 WO2011117970 A1 WO 2011117970A1
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Prior art keywords
exhaust
valve
exhaust gas
internal combustion
combustion engine
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PCT/JP2010/054976
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French (fr)
Japanese (ja)
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裕史 ▲吉▼村
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トヨタ自動車株式会社
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Priority to PCT/JP2010/054976 priority Critical patent/WO2011117970A1/en
Publication of WO2011117970A1 publication Critical patent/WO2011117970A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/43—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics

Definitions

  • the present invention relates to an internal combustion engine with an exhaust gas recirculation device, and more particularly to an internal combustion engine with an exhaust gas recirculation device that recirculates exhaust gas of a specific cylinder to the intake side.
  • Patent Literature 1 discloses an exhaust gas recirculation device for a supercharged multi-cylinder diesel engine that includes an exhaust gas recirculation passage that connects an exhaust passage of a specific cylinder and an intake passage downstream of a compressor.
  • the exhaust gas from the specific cylinder returns to the intake passage through the exhaust gas recirculation passage and the exhaust passage through which the exhaust gas from the cylinders other than the specific cylinder flows.
  • a switching valve is provided for switching between a flow path form in which exhaust gas from a specific cylinder merges.
  • the amount of exhaust gas recirculated from the specific cylinder to the intake passage can be adjusted by controlling the switching valve.
  • the exhaust system in which the switching valve is arranged is a part that generally becomes high temperature and pressure. If the switching valve is placed in such an environment for a long period of time, there is a risk of problems such as sticking or malfunction. As a result, it may be difficult to ensure high reliability in the operation of the switching valve.
  • the present invention has been made to solve the above-described problems.
  • the recirculated exhaust gas amount is ensured while ensuring high reliability.
  • An object of the present invention is to provide an internal combustion engine with an exhaust gas recirculation device that can be adjusted.
  • a first invention is an internal combustion engine with an exhaust gas recirculation device, At least one first exhaust port provided in a specific cylinder of the internal combustion engine and connected to an exhaust passage communicating with the atmosphere; At least one second exhaust port provided in the specific cylinder; An exhaust gas recirculation passage communicating the second exhaust port and the intake passage; At least one first exhaust valve responsible for opening and closing the first exhaust port; At least one second exhaust valve responsible for opening and closing the second exhaust port; An exhaust variable valve operating apparatus that varies a valve opening characteristic of at least one of the first exhaust valve and the second exhaust valve; It is characterized by providing.
  • the second invention is the first invention, wherein
  • the exhaust variable valve operating device is a valve operating device that relatively changes a valve opening characteristic of the first exhaust valve and a valve opening characteristic of the second exhaust valve.
  • the third invention is the first or second invention, wherein
  • the specific cylinder is at least one cylinder that is not all of the cylinders included in the internal combustion engine
  • the exhaust variable valve operating apparatus includes a first valve stop mechanism capable of stopping the first exhaust valve at a valve closing position.
  • the exhaust variable valve operating apparatus includes a second valve stop mechanism capable of stopping the second exhaust valve at a closed position
  • the internal combustion engine further includes valve stop execution means for stopping the second exhaust valve at a closed position using the second valve stop mechanism under a predetermined operating condition in which combustion becomes unstable.
  • the fifth invention is the first or second invention, wherein
  • the exhaust variable valve mechanism includes a variable working angle mechanism that varies a working angle of at least one of the first exhaust valve and the second exhaust valve.
  • the sixth invention is the fifth invention, wherein
  • the internal combustion engine uses the variable working angle mechanism to set the working angle of at least one of the first exhaust valve and the second exhaust valve so that the exhaust gas recirculation rate becomes the target exhaust gas recirculation rate. It further comprises operating angle adjusting means for adjusting.
  • the second exhaust port and the exhaust gas recirculation passage from the specific cylinder are adjusted by adjusting the valve opening characteristics of at least one of the first exhaust valve and the second exhaust valve using the variable exhaust valve operating device.
  • the amount of exhaust gas recirculated to the intake passage (the amount of recirculated exhaust gas) can be adjusted. For this reason, according to the present invention, it is possible to adjust the amount of recirculated exhaust gas while ensuring high reliability even if the exhaust system that is at high temperature and high pressure is not provided with a special switching valve.
  • the valve opening characteristic of the first exhaust valve and the valve opening characteristic of the second exhaust valve are relatively changed by using the variable exhaust valve operating device, thereby ensuring high reliability. It becomes possible to adjust the amount of recirculated exhaust gas.
  • the second exhaust valve is stopped at the closed position by the first valve stop mechanism, whereby the entire amount of the exhaust gas from the specific cylinder can be recirculated to the intake passage, and high reliability is achieved. It is possible to adjust the amount of recirculated exhaust gas with the characteristics.
  • the fourth aspect of the invention it is possible to prevent the exhaust gas from the specific cylinder from recirculating to the intake passage under operating conditions where combustion is unstable, and to ensure combustion stability.
  • the exhaust gas recirculation rate of the internal combustion engine can be made variable by adjusting the operating angle of at least one of the first exhaust valve and the second exhaust valve.
  • the exhaust gas recirculation rate of the internal combustion engine becomes the target exhaust gas recirculation rate by adjusting the working angle of at least one of the first exhaust valve and the second exhaust valve. It becomes possible to control.
  • FIG. 1 is a diagram for explaining a configuration of an internal combustion engine 10 according to a first embodiment of the present invention.
  • the system of this embodiment includes a spark ignition type internal combustion engine (gasoline engine) 10.
  • the internal combustion engine 10 is, for example, an in-line four-cylinder engine having four cylinders A to D.
  • each of the cylinders A to D is provided with two intake ports 12.
  • Each of the cylinders A to D is provided with an intake valve 14 for opening and closing each intake port 12.
  • Each intake port 12 is connected to an intake passage 16 for taking air into each cylinder.
  • An air cleaner 18 is installed in the vicinity of the inlet of the intake passage 16.
  • An air flow meter 20 that outputs a signal corresponding to the flow rate of air taken into the intake passage 16 is provided downstream of the air cleaner 18.
  • a compressor 22 a of the turbocharger 22 is disposed downstream of the air flow meter 20.
  • An intercooler 24 for cooling the intake air compressed by the compressor 22a is installed downstream of the compressor 22a.
  • a throttle valve 26 is provided downstream of the intercooler 24.
  • the throttle valve 26 is an electronically controlled throttle valve that can control the throttle opening independently of the accelerator opening.
  • a surge tank 28 is provided downstream of the throttle valve 26.
  • the intake passage 16 branches downstream of the surge tank 28 and is connected to the cylinders A to D.
  • each of the cylinders A to D is provided with an exhaust valve 32 for opening and closing each exhaust port 30.
  • the branch pipe portions 34A to 34D of the exhaust passage 34 communicating with the atmosphere are connected to the cylinders A to D, respectively.
  • the branch pipe portions 34A to 34C in the cylinders A to C are configured as a common pipe line for the two exhaust ports 30 of the respective cylinders.
  • the turbine 22b of the turbocharger 22 is connected to the exhaust passage 34 after the branch pipe portions 34A to 34D are joined.
  • a catalyst 40 for purifying exhaust gas is installed downstream of the turbine 22b.
  • the system of this embodiment includes a fuel injection valve 42 for injecting fuel into each cylinder A to D, a spark plug 44 for igniting an air-fuel mixture in each cylinder A to D, and an engine speed. And a crank angle sensor 46 for detection.
  • the system of this embodiment includes an exhaust variable valve operating device 48 that drives the exhaust valve 32 of each of the cylinders A to D.
  • the exhaust valve 32 that opens and closes the first exhaust port 30a provided in the cylinder D which is a cylinder dedicated to EGR exhaust, is referred to as a first exhaust valve 32a (symbol “EX1” may be attached).
  • the exhaust valve 32 that opens and closes the second exhaust port 30b provided in the cylinder D is referred to as a second exhaust valve 32b (the symbol “EX2” may be attached).
  • the exhaust variable valve operating device 48 has a first valve stop mechanism capable of switching the operation state of the first exhaust valve EX1 provided in the cylinder D between the valve operating state and the valve closed stop state. Further, the variable exhaust valve device 48 independently changes the operation state of the second exhaust valve EX2 between the valve operation state and the valve closed stop state independently of the switching of the operation state of the first exhaust valve EX1.
  • a switchable second valve stop mechanism is provided.
  • the specific configuration for realizing the first and second valve stop mechanisms is not particularly limited. For example, the rocker arm swinging operation for transmitting the cam acting force to the exhaust valve EX1 or EX2. It is possible to use a configuration that can be stopped using a switching pin. For example, an electromagnetically driven valve can be used.
  • the system shown in FIG. 1 includes an ECU (Electronic Control Unit) 50.
  • ECU Electronic Control Unit
  • various sensors for detecting the operating state of the internal combustion engine 10 are connected to the input of the ECU 50.
  • various actuators such as the exhaust variable valve operating device 48 described above are connected to the output of the ECU 50.
  • the ECU 50 can control the operating state of the internal combustion engine 10 based on those sensor outputs.
  • FIG. 2 is a diagram showing the valve opening characteristics of the first exhaust valve EX1 and the second exhaust valve EX2 controlled by the exhaust variable valve operating apparatus 48 shown in FIG.
  • the first valve stop mechanism provided in the exhaust variable valve device 48 described above, by driving a hydraulic or electric actuator (not shown) provided in the first valve stop mechanism based on a drive signal from the ECU 50.
  • the first exhaust valve EX1 can be stopped at the closed position.
  • FIG. 2A by operating such a first valve stop mechanism, the second exhaust valve EX2 is normally opened and closed, and the first exhaust valve EX1 is closed by the first valve stop mechanism. The state controlled to stop at the valve position is shown.
  • FIG. 2B shows that by operating such a second valve stop mechanism, the first exhaust valve EX1 is normally opened and closed, and the second exhaust valve EX2 is closed by the second valve stop mechanism. The state controlled to stop at the valve position is shown.
  • step 100 If the determination in step 100 is not established, that is, if it can be determined that the operating condition is such that EGR can be introduced, the first exhaust valve EX1 is closed by the first valve stop mechanism, and the second exhaust valve is stopped.
  • the variable exhaust valve device 48 is controlled so that the valve EX2 is in the valve operating state (step 102).
  • step 100 when the determination in step 100 is satisfied, that is, when it can be determined that the operating condition is concerned that combustion may become unstable when EGR is introduced, the first exhaust valve EX1 is in the valve operating state. Then, the variable exhaust valve device 48 is controlled so that the second exhaust valve EX2 is closed by the second valve stop mechanism (step 104).
  • the internal combustion engine 10 of the present embodiment is provided with the cylinder D as an EGR exhaust exclusive cylinder.
  • the exhaust passage 34 is connected to the first exhaust port 30a
  • the EGR passage 36 is connected to the second exhaust port 30b.
  • the first and second valve stop mechanisms capable of switching the operation state between the valve operating state and the valve closed stop state for each of the two exhaust valves EX1 and EX2 in the EGR exhaust dedicated cylinder D are provided. I made it. According to such a configuration, the valve opening characteristic of the first exhaust valve EX1 and the valve opening characteristic of the second exhaust valve EX2 in the EGR exhaust dedicated cylinder D can be relatively changed.
  • the first exhaust valve EX1 is closed and the second exhaust valve EX2 is in the valve operating state, whereby the total amount of exhaust gas discharged from the cylinder D is transferred to the intake passage 16 via the EGR passage 36. It can be refluxed. Thereby, the introduction property and combustion resistance of EGR can be improved.
  • the second exhaust valve EX2 is closed and the first exhaust valve EX1 is operated so that the cylinder D can be operated.
  • the entire amount of exhaust gas discharged can be circulated through the exhaust passage 34.
  • the opening characteristics of the first exhaust valve EX1 in the EGR exhaust dedicated cylinder D and the second opening characteristic can be obtained without providing a special switching valve in the exhaust system that is at high temperature and high pressure.
  • the variable exhaust valve device 48 that can relatively change the valve opening characteristic of the exhaust valve EX2, it is possible to adjust the EGR gas amount while ensuring high reliability.
  • the EGR exhaust dedicated cylinder D corresponds to the “specific cylinder” in the first aspect of the invention.
  • the “valve stop execution means” in the fourth aspect of the present invention is realized by the ECU 50 executing the processing of steps 100 and 104 described above.
  • the internal combustion engine 60 shown in FIG. 4 is configured in the same manner as the internal combustion engine 10 of the first embodiment described above, except that the configuration of the variable exhaust valve operating device 62 is different from that of the variable exhaust valve operating device 48. That is, the variable exhaust valve device 62 of the present embodiment continuously varies the operating angle (opening time) of the first exhaust valve EX1 in the EGR exhaust dedicated cylinder D instead of the first and second valve stop mechanisms.
  • a variable working angle mechanism is not particularly limited. For example, the configuration detailed in International Publication No. WO 2006/132059 of the international application can be used.
  • FIG. 5 is a diagram showing the valve opening characteristics of the first exhaust valve EX1 controlled by the exhaust variable valve operating apparatus 62 shown in FIG.
  • a hydraulic or electric actuator (not shown) provided in the variable working angle mechanism is driven based on a drive signal from the ECU 50, thereby As shown in FIG. 5, the operating angle (and lift amount) of the first exhaust valve EX1 can be continuously changed.
  • the amount of exhaust gas discharged through the first exhaust valve EX1 can be adjusted by controlling the operating angle of the first exhaust valve EX1, and accordingly, the first 2 It is possible to adjust the amount of exhaust gas that exits the exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36. For this reason, the EGR rate can be varied during operation of the internal combustion engine 60 by adjusting the operating angle of the first exhaust valve EX1.
  • the operating angle of the first exhaust valve EX1 is increased (that is, when the opening time of the first exhaust valve EX1 is increased), the amount of exhaust gas flowing out through the first exhaust valve EX1 increases. Accordingly, the amount of exhaust gas that exits from the second exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36 is reduced. Thereby, an EGR rate falls. Conversely, when the operating angle of the first exhaust valve EX1 is reduced (that is, when the opening time of the first exhaust valve EX1 is shortened), the EGR rate can be increased.
  • variable exhaust valve operating device 62 having the variable operating angle mechanism that makes the operating angle of the first exhaust valve EX1 variable is provided, so that the The valve opening characteristic of the first exhaust valve EX1 and the valve opening characteristic of the second exhaust valve EX2 can be relatively changed.
  • the configuration of this embodiment also makes it possible to adjust the amount of EGR gas while ensuring high reliability even if the exhaust system that is at high temperature and high pressure is not equipped with a special switching valve.
  • the exhaust variable valve operating apparatus 62 having a variable working angle mechanism that makes the working angle of the first exhaust valve EX1 variable is provided.
  • the exhaust variable valve operating apparatus in the present invention is not limited to this. That is, the valve opening of the first exhaust valve EX1 in the specific cylinder of the present invention is also achieved by controlling the operating angle of the second exhaust valve EX2 by providing a variable operating angle mechanism that makes the operating angle of the second exhaust valve EX2 variable.
  • the characteristics and the valve opening characteristics of the second exhaust valve EX2 can be changed relatively, thereby adjusting the amount of EGR gas that leaves the second exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36. can do.
  • variable working angle mechanism that makes the working angle of the second exhaust valve EX2 variable may be provided, or a variable working angle that makes the working angle of the first exhaust valve EX1 variable.
  • a variable working angle mechanism that makes the working angle of the second exhaust valve EX2 variable may be provided.
  • the EGR exhaust dedicated cylinder D has two exhaust ports (first exhaust port 30a and second exhaust port 30b) and two exhaust valves corresponding to the exhaust ports (first exhaust port).
  • the description has been given by taking the internal combustion engine 10 or 60 having the valve EX1 and the second exhaust valve EX2) as an example.
  • the number of first and second exhaust ports provided in a specific cylinder in the present invention and the number of first and second exhaust valves corresponding thereto are not limited to the above. That is, the specific cylinder has one or more first exhaust ports connected to the exhaust passage communicating with the atmosphere, one or more second exhaust ports connected to the exhaust gas recirculation passage, and the number of those exhaust ports. Any configuration including a corresponding number of first and second exhaust valves may be used.

Abstract

An internal combustion engine provided with an exhaust gas recirculation device is configured so that the exhaust gas from a specific cylinder is recirculated to the air intake path, and the configuration enables the amount of recirculated exhaust gas to be adjusted with high reliability. An internal combustion engine provided with an exhaust gas recirculation device comprises a first exhaust gas discharge port (30a) which is provided to a cylinder (D) (specific cylinder) of the internal combustion engine (10), the cylinder (D) being dedicated to EGR discharge, and which is connected to the exhaust gas discharge passage (34) communicating with the atmosphere; a second exhaust gas discharge port (30b) provided to the cylinder (D); an EGR passage (36) for connecting the second exhaust gas discharge port (30b) and the air intake passage(16); a first exhaust gas discharge valve EX1 (32a) and a second exhaust gas discharge valve EX2 (32b) which open and close the first exhaust gas discharge port (30a) and the second exhaust gas discharge port (30b); and a variable valve device (34) for exhaust gas, having valve stop mechanisms respectively provided for the first exhaust gas discharge valve EX1 (32a) and the second exhaust gas discharge valve EX2 (32b).

Description

排気ガス再循環装置付き内燃機関Internal combustion engine with exhaust gas recirculation device
　この発明は、排気ガス再循環装置付き内燃機関に係り、特に、特定気筒の排気ガスを吸気側に再循環させる排気ガス再循環装置付き内燃機関に関する。 The present invention relates to an internal combustion engine with an exhaust gas recirculation device, and more particularly to an internal combustion engine with an exhaust gas recirculation device that recirculates exhaust gas of a specific cylinder to the intake side.
　従来、例えば特許文献１には、特定気筒の排気通路とコンプレッサ下流の吸気通路とを接続する排気還流通路を備える過給式多気筒ディーゼルエンジンの排気還流装置が開示されている。この従来のディーゼルエンジンは、上記特定気筒からの排気ガスが排気還流通路を通って吸気通路に還流される流路形態と、上記特定気筒以外の気筒からの排気ガスが流れる排気通路に対して上記特定気筒からの排気ガスが合流する流路形態とを切り換える切換弁を備えている。
　尚、出願人は、本発明に関連するものとして、上記の文献を含めて、以下に記載する文献を認識している。 Conventionally, for example, Patent Literature 1 discloses an exhaust gas recirculation device for a supercharged multi-cylinder diesel engine that includes an exhaust gas recirculation passage that connects an exhaust passage of a specific cylinder and an intake passage downstream of a compressor. In this conventional diesel engine, the exhaust gas from the specific cylinder returns to the intake passage through the exhaust gas recirculation passage and the exhaust passage through which the exhaust gas from the cylinders other than the specific cylinder flows. A switching valve is provided for switching between a flow path form in which exhaust gas from a specific cylinder merges.
The applicant has recognized the following documents including the above-mentioned documents as related to the present invention.
日本実開昭６３－１３２８６５号公報Japanese Utility Model Publication No. 63-132865 日本特開平１１－２５７１６４号公報Japanese Unexamined Patent Publication No. 11-257164
　上述した従来の排気還流装置では、上記切換弁を制御することで、上記特定気筒から吸気通路に還流される排気ガス量（再循環排気ガス量）を調整することができる。しかしながら、上記切換弁が配置される排気系は、一般的に高温高圧となる部位である。上記切換弁がそのような環境下に長期間に渡って置かれると、固着または動作不良等の不具合が生ずるおそれがある。その結果、切換弁の動作に高い信頼性を確保することが難しくなる場合が生じ得る。 In the conventional exhaust gas recirculation device described above, the amount of exhaust gas recirculated from the specific cylinder to the intake passage (recirculated exhaust gas amount) can be adjusted by controlling the switching valve. However, the exhaust system in which the switching valve is arranged is a part that generally becomes high temperature and pressure. If the switching valve is placed in such an environment for a long period of time, there is a risk of problems such as sticking or malfunction. As a result, it may be difficult to ensure high reliability in the operation of the switching valve.
　この発明は、上述のような課題を解決するためになされたもので、特定気筒からの排気ガスを吸気通路に還流させる構成を有する場合において、高い信頼性を確保しながら再循環排気ガス量の調整を可能とする排気ガス再循環装置付き内燃機関を提供することを目的とする。 The present invention has been made to solve the above-described problems. In the case where the exhaust gas from a specific cylinder is recirculated to the intake passage, the recirculated exhaust gas amount is ensured while ensuring high reliability. An object of the present invention is to provide an internal combustion engine with an exhaust gas recirculation device that can be adjusted.
　第１の発明は、排気ガス再循環装置付き内燃機関であって、
　内燃機関の特定気筒に設けられ、大気と連通する排気通路と接続される少なくとも１つの第１排気ポートと、
　前記特定気筒に設けられた少なくとも１つの第２排気ポートと、
　前記第２排気ポートと吸気通路とを連通する排気ガス再循環通路と、
　前記第１排気ポートの開閉を担う少なくとも１つの第１排気弁と、
　前記第２排気ポートの開閉を担う少なくとも１つの第２排気弁と、
　前記第１排気弁および前記第２排気弁のうちの少なくとも一方の開弁特性を可変とする排気可変動弁装置と、
　を備えることを特徴とする。 A first invention is an internal combustion engine with an exhaust gas recirculation device,
At least one first exhaust port provided in a specific cylinder of the internal combustion engine and connected to an exhaust passage communicating with the atmosphere;
At least one second exhaust port provided in the specific cylinder;
An exhaust gas recirculation passage communicating the second exhaust port and the intake passage;
At least one first exhaust valve responsible for opening and closing the first exhaust port;
At least one second exhaust valve responsible for opening and closing the second exhaust port;
An exhaust variable valve operating apparatus that varies a valve opening characteristic of at least one of the first exhaust valve and the second exhaust valve;
It is characterized by providing.
　また、第２の発明は、第１の発明において、
　前記排気可変動弁装置は、前記第１排気弁の開弁特性と前記第２排気弁の開弁特性とを相対的に変化させる動弁装置であることを特徴とする。 The second invention is the first invention, wherein
The exhaust variable valve operating device is a valve operating device that relatively changes a valve opening characteristic of the first exhaust valve and a valve opening characteristic of the second exhaust valve.
　また、第３の発明は、第１または第２の発明において、
　前記特定気筒は、前記内燃機関が備える気筒の全部ではない少なくとも１つの気筒であり、
　前記排気可変動弁装置は、前記第１排気弁を閉弁位置で停止可能な第１弁停止機構を含むことを特徴とする。 The third invention is the first or second invention, wherein
The specific cylinder is at least one cylinder that is not all of the cylinders included in the internal combustion engine,
The exhaust variable valve operating apparatus includes a first valve stop mechanism capable of stopping the first exhaust valve at a valve closing position.
　また、第４の発明は、第１乃至第３の発明の何れかにおいて、
　前記排気可変動弁装置は、前記第２排気弁を閉弁位置で停止可能な第２弁停止機構を含み、
　前記内燃機関は、燃焼が不安定となる所定の運転条件では、前記第２弁停止機構を用いて前記第２排気弁を閉弁位置で停止させる弁停止実行手段を更に備えることを特徴とする。 According to a fourth invention, in any one of the first to third inventions,
The exhaust variable valve operating apparatus includes a second valve stop mechanism capable of stopping the second exhaust valve at a closed position,
The internal combustion engine further includes valve stop execution means for stopping the second exhaust valve at a closed position using the second valve stop mechanism under a predetermined operating condition in which combustion becomes unstable. .
　また、第５の発明は、第１または第２の発明において、
　前記排気可変動弁装置は、前記第１排気弁および前記第２排気弁のうちの少なくとも一方の作用角を可変とする可変作用角機構を含むことを特徴とする。 The fifth invention is the first or second invention, wherein
The exhaust variable valve mechanism includes a variable working angle mechanism that varies a working angle of at least one of the first exhaust valve and the second exhaust valve.
　また、第６の発明は、第５の発明において、
　前記内燃機関は、排気ガス再循環率が目標排気ガス再循環率となるように、前記可変作用角機構を用いて前記第１排気弁および前記第２排気弁のうちの少なくとも一方の作用角を調整する作用角調整手段を更に備えることを特徴とする。 The sixth invention is the fifth invention, wherein
The internal combustion engine uses the variable working angle mechanism to set the working angle of at least one of the first exhaust valve and the second exhaust valve so that the exhaust gas recirculation rate becomes the target exhaust gas recirculation rate. It further comprises operating angle adjusting means for adjusting.
　第１の発明によれば、排気可変動弁装置を用いた第１排気弁および第２排気弁の少なくとも一方の開弁特性の調整によって、特定気筒から第２排気ポートおよび排気ガス再循環通路を介して吸気通路に還流される排気ガス量（再循環排気ガス量）を調整することができる。このため、本発明によれば、高温高圧となる排気系に特別な切換弁を備えていなくても、高い信頼性を確保しながら再循環排気ガス量を調整することが可能となる。 According to the first invention, the second exhaust port and the exhaust gas recirculation passage from the specific cylinder are adjusted by adjusting the valve opening characteristics of at least one of the first exhaust valve and the second exhaust valve using the variable exhaust valve operating device. The amount of exhaust gas recirculated to the intake passage (the amount of recirculated exhaust gas) can be adjusted. For this reason, according to the present invention, it is possible to adjust the amount of recirculated exhaust gas while ensuring high reliability even if the exhaust system that is at high temperature and high pressure is not provided with a special switching valve.
　第２の発明によれば、排気可変動弁装置を用いて第１排気弁の開弁特性と第２排気弁の開弁特性とを相対的に変化させることにより、高い信頼性を確保しながら再循環排気ガス量を調整することが可能となる。 According to the second aspect of the invention, the valve opening characteristic of the first exhaust valve and the valve opening characteristic of the second exhaust valve are relatively changed by using the variable exhaust valve operating device, thereby ensuring high reliability. It becomes possible to adjust the amount of recirculated exhaust gas.
　第３の発明によれば、第１弁停止機構によって第２排気弁を閉弁位置で停止させることにより、特定気筒からの排気ガスの全量を吸気通路に還流させることを可能としながら、高い信頼性を伴う再循環排気ガス量の調整が可能となる。 According to the third aspect of the invention, the second exhaust valve is stopped at the closed position by the first valve stop mechanism, whereby the entire amount of the exhaust gas from the specific cylinder can be recirculated to the intake passage, and high reliability is achieved. It is possible to adjust the amount of recirculated exhaust gas with the characteristics.
　第４の発明によれば、燃焼が不安定な運転条件下において、特定気筒からの排気ガスが吸気通路に還流するのを防ぐことができ、燃焼安定性を確保することができる。 According to the fourth aspect of the invention, it is possible to prevent the exhaust gas from the specific cylinder from recirculating to the intake passage under operating conditions where combustion is unstable, and to ensure combustion stability.
　第５の発明によれば、第１排気弁および第２排気弁のうちの少なくとも一方の作用角の調整によって、内燃機関の排気ガス再循環率を可変とすることができる。 According to the fifth aspect of the invention, the exhaust gas recirculation rate of the internal combustion engine can be made variable by adjusting the operating angle of at least one of the first exhaust valve and the second exhaust valve.
　第６の発明によれば、第１排気弁および第２排気弁のうちの少なくとも一方の作用角の調整を用いて、内燃機関の排気ガス再循環率が目標排気ガス再循環率となるように制御することが可能となる。 According to the sixth aspect of the invention, the exhaust gas recirculation rate of the internal combustion engine becomes the target exhaust gas recirculation rate by adjusting the working angle of at least one of the first exhaust valve and the second exhaust valve. It becomes possible to control.
本発明の実施の形態１の内燃機関の構成を説明するための図である。It is a figure for demonstrating the structure of the internal combustion engine of Embodiment 1 of this invention. 図１に示す排気可変動弁装置により制御される第１排気弁ＥＸ１および第２排気弁ＥＸ２の開弁特性を表した図である。FIG. 3 is a diagram showing valve opening characteristics of a first exhaust valve EX1 and a second exhaust valve EX2 controlled by the variable exhaust valve operating device shown in FIG. 本発明の実施の形態１において実行されるルーチンのフローチャートである。It is a flowchart of the routine performed in Embodiment 1 of the present invention. 本発明の実施の形態２の内燃機関の構成を説明するための図である。It is a figure for demonstrating the structure of the internal combustion engine of Embodiment 2 of this invention. 図４に示す排気可変動弁装置により制御される第１排気弁ＥＸ１の開弁特性を表した図である。FIG. 5 is a diagram showing a valve opening characteristic of a first exhaust valve EX1 controlled by the exhaust variable valve operating apparatus shown in FIG.
実施の形態１．
[実施の形態１のシステム構成の説明]
　図１は、本発明の実施の形態１の内燃機関１０の構成を説明するための図である。本実施形態のシステムは、火花点火式の内燃機関（ガソリンエンジン）１０を備えている。本実施形態では、内燃機関１０は、一例として、気筒Ａ～Ｄの４つの気筒を有する直列４気筒型エンジンであるものとする。 Embodiment 1 FIG.
[Description of System Configuration of Embodiment 1]
FIG. 1 is a diagram for explaining a configuration of an internal combustion engine 10 according to a first embodiment of the present invention. The system of this embodiment includes a spark ignition type internal combustion engine (gasoline engine) 10. In the present embodiment, the internal combustion engine 10 is, for example, an in-line four-cylinder engine having four cylinders A to D.
　図１に示すように、Ａ～Ｄの各気筒には、２つの吸気ポート１２がそれぞれ設けられている。また、Ａ～Ｄの各気筒には、各吸気ポート１２の開閉を担う吸気弁１４がそれぞれ設けられている。各吸気ポート１２には、各気筒に空気を取り込むための吸気通路１６が接続されている。 As shown in FIG. 1, each of the cylinders A to D is provided with two intake ports 12. Each of the cylinders A to D is provided with an intake valve 14 for opening and closing each intake port 12. Each intake port 12 is connected to an intake passage 16 for taking air into each cylinder.
　吸気通路１６の入口近傍には、エアクリーナ１８が設置されている。エアクリーナ１８の下流には、吸気通路１６に吸入される空気の流量に応じた信号を出力するエアフローメータ２０が設けられている。エアフローメータ２０の下流には、ターボ過給機２２のコンプレッサ２２ａが配置されている。コンプレッサ２２ａの下流には、コンプレッサ２２ａで圧縮された吸入空気を冷却するためのインタークーラ２４が設置されている。 An air cleaner 18 is installed in the vicinity of the inlet of the intake passage 16. An air flow meter 20 that outputs a signal corresponding to the flow rate of air taken into the intake passage 16 is provided downstream of the air cleaner 18. A compressor 22 a of the turbocharger 22 is disposed downstream of the air flow meter 20. An intercooler 24 for cooling the intake air compressed by the compressor 22a is installed downstream of the compressor 22a.
　インタークーラ２４の下流には、スロットルバルブ２６が設けられている。スロットルバルブ２６は、アクセル開度と独立してスロットル開度を制御することのできる電子制御式スロットルバルブである。スロットルバルブ２６の下流には、サージタンク２８が設けられている。吸気通路１６は、サージタンク２８の下流において分岐し、各気筒Ａ～Ｄと接続されている。 A throttle valve 26 is provided downstream of the intercooler 24. The throttle valve 26 is an electronically controlled throttle valve that can control the throttle opening independently of the accelerator opening. A surge tank 28 is provided downstream of the throttle valve 26. The intake passage 16 branches downstream of the surge tank 28 and is connected to the cylinders A to D.
　また、Ａ～Ｄの各気筒には、２つの排気ポート３０がそれぞれ設けられている。更に、Ａ～Ｄの各気筒には、各排気ポート３０の開閉を担う排気弁３２がそれぞれ設けられている。図１に示すように、Ａ～Ｄの各気筒には、大気と連通する排気通路３４の各枝管部３４Ａ～Ｄがそれぞれ接続されている。より具体的には、気筒Ａ～Ｃにおける各枝管部３４Ａ～Ｃは、それぞれの気筒の２つの排気ポート３０に共通の管路として構成されている。 Further, two exhaust ports 30 are provided in each of the cylinders A to D, respectively. Further, each of the cylinders A to D is provided with an exhaust valve 32 for opening and closing each exhaust port 30. As shown in FIG. 1, the branch pipe portions 34A to 34D of the exhaust passage 34 communicating with the atmosphere are connected to the cylinders A to D, respectively. More specifically, the branch pipe portions 34A to 34C in the cylinders A to C are configured as a common pipe line for the two exhaust ports 30 of the respective cylinders.
　これに対し、気筒Ｄでは、一方の第１排気ポート３０ａのみが、排気通路３４の枝管部３４Ｄに接続されている。そして、気筒Ｄにおける他方の第２排気ポート３０ｂは、排気ガス再循環通路（以下、「ＥＧＲ通路」と称する）３６の一端と接続されている。ＥＧＲ通路３６の他端は、サージタンク２８に接続されている。ＥＧＲ通路３６の途中の部位には、ＥＧＲ通路３６を通る排気ガス（再循環排気ガス（ＥＧＲガス））を冷却するためのＥＧＲクーラ３８が設けられている。以上のように、気筒Ｄは、他の気筒Ａ～Ｃとは異なり、吸気通路１６に還流される排気ガス（ＥＧＲガス）を排出するＥＧＲ排出専用気筒として構成されている。 In contrast, in the cylinder D, only one first exhaust port 30a is connected to the branch pipe portion 34D of the exhaust passage 34. The other second exhaust port 30 b in the cylinder D is connected to one end of an exhaust gas recirculation passage (hereinafter referred to as “EGR passage”) 36. The other end of the EGR passage 36 is connected to the surge tank 28. An EGR cooler 38 for cooling the exhaust gas (recirculated exhaust gas (EGR gas)) passing through the EGR passage 36 is provided at a position in the middle of the EGR passage 36. As described above, unlike the other cylinders A to C, the cylinder D is configured as an EGR exhaust dedicated cylinder that exhausts exhaust gas (EGR gas) recirculated to the intake passage 16.
　また、各枝管部３４Ａ～３４Ｄが合流した後の排気通路３４には、ターボ過給機２２のタービン２２ｂが接続されている。タービン２２ｂの下流には、排気ガスを浄化するための触媒４０が設置されている。更に、本実施形態のシステムは、各気筒Ａ～Ｄに燃料を噴射するための燃料噴射弁４２と、各気筒Ａ～Ｄ内の混合気に点火するための点火プラグ４４と、エンジン回転数を検知するためのクランク角センサ４６とを備えている。 Further, the turbine 22b of the turbocharger 22 is connected to the exhaust passage 34 after the branch pipe portions 34A to 34D are joined. A catalyst 40 for purifying exhaust gas is installed downstream of the turbine 22b. Furthermore, the system of this embodiment includes a fuel injection valve 42 for injecting fuel into each cylinder A to D, a spark plug 44 for igniting an air-fuel mixture in each cylinder A to D, and an engine speed. And a crank angle sensor 46 for detection.
　更に、本実施形態のシステムは、Ａ～Ｄの各気筒の排気弁３２を駆動する排気可変動弁装置４８を備えている。尚、ここでは、ＥＧＲ排出専用気筒である気筒Ｄに設けられた第１排気ポート３０ａの開閉を担う排気弁３２を第１排気弁３２ａ（符号「ＥＸ１」を付すこともある。）と称し、また、気筒Ｄに設けられた第２排気ポート３０ｂの開閉を担う排気弁３２を第２排気弁３２ｂ（符号「ＥＸ２」を付すこともある。）と称する。 Furthermore, the system of this embodiment includes an exhaust variable valve operating device 48 that drives the exhaust valve 32 of each of the cylinders A to D. Here, the exhaust valve 32 that opens and closes the first exhaust port 30a provided in the cylinder D, which is a cylinder dedicated to EGR exhaust, is referred to as a first exhaust valve 32a (symbol “EX1” may be attached). In addition, the exhaust valve 32 that opens and closes the second exhaust port 30b provided in the cylinder D is referred to as a second exhaust valve 32b (the symbol “EX2” may be attached).
　排気可変動弁装置４８は、気筒Ｄに設けられた第１排気弁ＥＸ１の動作状態を、弁稼動状態と閉弁停止状態との間で切り換え可能な第１弁停止機構を有している。また、排気可変動弁装置４８は、第１排気弁ＥＸ１の動作状態の上記切り換えと独立して、第２排気弁ＥＸ２の動作状態を、弁稼動状態と閉弁停止状態との間で個別に切り換え可能な第２弁停止機構を有している。尚、これらの第１および第２弁停止機構を実現する具体的な構成は、特に限定されるものではなく、例えば、カムの作用力を排気弁ＥＸ１またはＥＸ２に伝達するロッカーアームの揺動動作を切換ピンを用いて休止可能な構成を用いることができる。また、例えば、電磁駆動弁を用いることもできる。 The exhaust variable valve operating device 48 has a first valve stop mechanism capable of switching the operation state of the first exhaust valve EX1 provided in the cylinder D between the valve operating state and the valve closed stop state. Further, the variable exhaust valve device 48 independently changes the operation state of the second exhaust valve EX2 between the valve operation state and the valve closed stop state independently of the switching of the operation state of the first exhaust valve EX1. A switchable second valve stop mechanism is provided. The specific configuration for realizing the first and second valve stop mechanisms is not particularly limited. For example, the rocker arm swinging operation for transmitting the cam acting force to the exhaust valve EX1 or EX2. It is possible to use a configuration that can be stopped using a switching pin. For example, an electromagnetically driven valve can be used.
　図１に示すシステムは、ＥＣＵ(Electronic Control Unit)５０を備えている。ＥＣＵ５０の入力には、上述したエアフローメータ２０およびクランク角センサ４６に加え、内燃機関１０の運転状態を検知するための各種センサが接続されている。また、ＥＣＵ５０の出力には、上述した排気可変動弁装置４８等の各種のアクチュエータが接続されている。ＥＣＵ５０は、それらのセンサ出力に基づいて、内燃機関１０の運転状態を制御することができる。 The system shown in FIG. 1 includes an ECU (Electronic Control Unit) 50. In addition to the air flow meter 20 and the crank angle sensor 46 described above, various sensors for detecting the operating state of the internal combustion engine 10 are connected to the input of the ECU 50. Also, various actuators such as the exhaust variable valve operating device 48 described above are connected to the output of the ECU 50. The ECU 50 can control the operating state of the internal combustion engine 10 based on those sensor outputs.
　図２は、図１に示す排気可変動弁装置４８により制御される第１排気弁ＥＸ１および第２排気弁ＥＸ２の開弁特性を表した図である。
　上述した排気可変動弁装置４８が備える第１弁停止機構によれば、ＥＣＵ５０からの駆動信号に基づいて第１弁停止機構が備える油圧式もしくは電動式のアクチュエータ（図示省略）を駆動することにより、第１排気弁ＥＸ１を閉弁位置で停止させることができる。図２（Ａ）は、そのような第１弁停止機構を機能させることにより、第２排気弁ＥＸ２の開閉動作が通常通り行われ、かつ、第１弁停止機構によって第１排気弁ＥＸ１が閉弁位置で停止するように制御された状態を示している。 FIG. 2 is a diagram showing the valve opening characteristics of the first exhaust valve EX1 and the second exhaust valve EX2 controlled by the exhaust variable valve operating apparatus 48 shown in FIG.
According to the first valve stop mechanism provided in the exhaust variable valve device 48 described above, by driving a hydraulic or electric actuator (not shown) provided in the first valve stop mechanism based on a drive signal from the ECU 50. The first exhaust valve EX1 can be stopped at the closed position. In FIG. 2A, by operating such a first valve stop mechanism, the second exhaust valve EX2 is normally opened and closed, and the first exhaust valve EX1 is closed by the first valve stop mechanism. The state controlled to stop at the valve position is shown.
　また、上述した排気可変動弁装置４８が備える第２弁停止機構によれば、ＥＣＵ５０からの駆動信号に基づいて第２弁停止機構が備える油圧式もしくは電動式のアクチュエータ（図示省略）を駆動することにより、第２排気弁ＥＸ２を閉弁位置で停止させることができる。図２（Ｂ）は、そのような第２弁停止機構を機能させることにより、第１排気弁ＥＸ１の開閉動作が通常通り行われ、かつ、第２弁停止機構によって第２排気弁ＥＸ２が閉弁位置で停止するように制御された状態を示している。 Further, according to the second valve stop mechanism provided in the exhaust variable valve operating device 48 described above, a hydraulic or electric actuator (not shown) provided in the second valve stop mechanism is driven based on a drive signal from the ECU 50. Thus, the second exhaust valve EX2 can be stopped at the valve closing position. FIG. 2B shows that by operating such a second valve stop mechanism, the first exhaust valve EX1 is normally opened and closed, and the second exhaust valve EX2 is closed by the second valve stop mechanism. The state controlled to stop at the valve position is shown.
［実施の形態１の制御］
　図３は、内燃機関１０のＥＧＲ率を制御するために、本実施の形態１においてＥＣＵ５０が実行するルーチンのフローチャートである。
　図３に示すルーチンでは、現在の内燃機関１０の運転条件が燃焼の不安定となる所定の運転条件であるか否かが判定される（ステップ１００）。より具体的には、本ステップ１００における所定の運転条件とは、排気ガスを吸気通路１６に還流させると著しく燃焼が不安定となる条件であり、例えば、始動時が該当する。 [Control of Embodiment 1]
FIG. 3 is a flowchart of a routine executed by the ECU 50 in the first embodiment in order to control the EGR rate of the internal combustion engine 10.
In the routine shown in FIG. 3, it is determined whether or not the current operating condition of the internal combustion engine 10 is a predetermined operating condition in which combustion becomes unstable (step 100). More specifically, the predetermined operating condition in step 100 is a condition in which combustion becomes extremely unstable when the exhaust gas is recirculated to the intake passage 16, and corresponds to, for example, a start time.
　上記ステップ１００における判定が不成立である場合、すなわち、ＥＧＲを導入可能な運転条件であると判断できる場合には、第１弁停止機構により第１排気弁ＥＸ１が閉弁停止状態となり、第２排気弁ＥＸ２が弁稼動状態となるように、排気可変動弁装置４８が制御される（ステップ１０２）。 If the determination in step 100 is not established, that is, if it can be determined that the operating condition is such that EGR can be introduced, the first exhaust valve EX1 is closed by the first valve stop mechanism, and the second exhaust valve is stopped. The variable exhaust valve device 48 is controlled so that the valve EX2 is in the valve operating state (step 102).
　一方、上記ステップ１００における判定が成立する場合、すなわち、ＥＧＲを導入すると燃焼が不安定となることが懸念される運転条件であると判断できる場合には、第１排気弁ＥＸ１が弁稼動状態となり、第２弁停止機構により第２排気弁ＥＸ２が閉弁停止状態となるように、排気可変動弁装置４８が制御される（ステップ１０４）。 On the other hand, when the determination in step 100 is satisfied, that is, when it can be determined that the operating condition is concerned that combustion may become unstable when EGR is introduced, the first exhaust valve EX1 is in the valve operating state. Then, the variable exhaust valve device 48 is controlled so that the second exhaust valve EX2 is closed by the second valve stop mechanism (step 104).
　以上説明したように、本実施形態の内燃機関１０は、ＥＧＲ排出専用気筒として気筒Ｄを備えるようにした。そして、このＥＧＲ排出専用気筒Ｄでは、第１排気ポート３０ａに対しては排気通路３４が接続され、第２排気ポート３０ｂに対してはＥＧＲ通路３６が接続されるようにした。更に、ＥＧＲ排出専用気筒Ｄにおける２つの排気弁ＥＸ１およびＥＸ２のそれぞれに対して、弁稼動状態と閉弁停止状態との間で動作状態を切り換え可能な第１および第２弁停止機構を備えるようにした。このような構成によれば、ＥＧＲ排出専用気筒Ｄにおける第１排気弁ＥＸ１の開弁特性と第２排気弁ＥＸ２の開弁特性とを相対的に変化させることができるようになる。 As described above, the internal combustion engine 10 of the present embodiment is provided with the cylinder D as an EGR exhaust exclusive cylinder. In the EGR exhaust dedicated cylinder D, the exhaust passage 34 is connected to the first exhaust port 30a, and the EGR passage 36 is connected to the second exhaust port 30b. Furthermore, the first and second valve stop mechanisms capable of switching the operation state between the valve operating state and the valve closed stop state for each of the two exhaust valves EX1 and EX2 in the EGR exhaust dedicated cylinder D are provided. I made it. According to such a configuration, the valve opening characteristic of the first exhaust valve EX1 and the valve opening characteristic of the second exhaust valve EX2 in the EGR exhaust dedicated cylinder D can be relatively changed.
　その結果、第１排気弁ＥＸ１を閉弁停止状態とし、第２排気弁ＥＸ２を弁稼動状態とすることにより、気筒Ｄから排出される排気ガスの全量をＥＧＲ通路３６を介して吸気通路１６に還流させることが可能となる。これにより、ＥＧＲの導入性および燃焼耐性を向上させることができる。 As a result, the first exhaust valve EX1 is closed and the second exhaust valve EX2 is in the valve operating state, whereby the total amount of exhaust gas discharged from the cylinder D is transferred to the intake passage 16 via the EGR passage 36. It can be refluxed. Thereby, the introduction property and combustion resistance of EGR can be improved.
　また、内燃機関１０の燃焼が不安定となる始動時などの運転条件下において、第２排気弁ＥＸ２を閉弁停止状態とし、第１排気弁ＥＸ１を弁稼動状態とすることにより、気筒Ｄから排出される排気ガスの全量を排気通路３４に流通させることができる。これにより、燃焼が不安定な運転条件下において、気筒Ｄからの排気ガスが吸気通路１６に還流するのを防ぐことができ、燃焼安定性を確保することができる。 Further, under the operating conditions such as at the time of start when the combustion of the internal combustion engine 10 becomes unstable, the second exhaust valve EX2 is closed and the first exhaust valve EX1 is operated so that the cylinder D can be operated. The entire amount of exhaust gas discharged can be circulated through the exhaust passage 34. Thereby, it is possible to prevent the exhaust gas from the cylinder D from returning to the intake passage 16 under an operation condition in which combustion is unstable, and to ensure combustion stability.
　以上のように、本実施形態の構成によれば、高温高圧となる排気系に特別な切換弁を備えていなくても、ＥＧＲ排出専用気筒Ｄにおける第１排気弁ＥＸ１の開弁特性と第２排気弁ＥＸ２の開弁特性とを相対的に変化させられる排気可変動弁装置４８を備えることによって、高い信頼性を確保しながらＥＧＲガス量を調整することが可能となる。 As described above, according to the configuration of the present embodiment, the opening characteristics of the first exhaust valve EX1 in the EGR exhaust dedicated cylinder D and the second opening characteristic can be obtained without providing a special switching valve in the exhaust system that is at high temperature and high pressure. By providing the variable exhaust valve device 48 that can relatively change the valve opening characteristic of the exhaust valve EX2, it is possible to adjust the EGR gas amount while ensuring high reliability.
　尚、上述した実施の形態１においては、ＥＧＲ排出専用気筒Ｄが前記第１の発明における「特定気筒」に相当している。
　また、ＥＣＵ５０が上記ステップ１００および１０４の処理を実行することにより前記第４の発明における「弁停止実行手段」が実現されている。 In the first embodiment described above, the EGR exhaust dedicated cylinder D corresponds to the “specific cylinder” in the first aspect of the invention.
Further, the “valve stop execution means” in the fourth aspect of the present invention is realized by the ECU 50 executing the processing of steps 100 and 104 described above.
実施の形態２．
　次に、図４および図５を参照して、本発明の実施の形態２について説明する。
[実施の形態２のシステム構成の説明]
　図４は、本発明の実施の形態２の内燃機関６０の構成を説明するための図である。尚、図４において、上記図１に示す構成要素と同一の要素については、同一の符号を付してその説明を省略または簡略する。 Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 4 and FIG.
[Description of System Configuration of Embodiment 2]
FIG. 4 is a diagram for illustrating the configuration of the internal combustion engine 60 according to the second embodiment of the present invention. In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted or simplified.
　図４に示す内燃機関６０は、排気可変動弁装置６２の構成が排気可変動弁装置４８と異なる点を除き、上述した実施の形態１の内燃機関１０と同様に構成されている。すなわち、本実施形態の排気可変動弁装置６２は、上記第１および第２弁停止機構に代え、ＥＧＲ排出専用気筒Ｄにおける第１排気弁ＥＸ１の作用角（開口時間）を連続的に可変させられる可変作用角機構を備えている。このような可変作用角機構の具体的な構成は、特に限定されるものではないが、例えば、国際出願の国際公開第ＷＯ ２００６／１３２０５９号において詳述された構成を用いることができる。 The internal combustion engine 60 shown in FIG. 4 is configured in the same manner as the internal combustion engine 10 of the first embodiment described above, except that the configuration of the variable exhaust valve operating device 62 is different from that of the variable exhaust valve operating device 48. That is, the variable exhaust valve device 62 of the present embodiment continuously varies the operating angle (opening time) of the first exhaust valve EX1 in the EGR exhaust dedicated cylinder D instead of the first and second valve stop mechanisms. A variable working angle mechanism. The specific configuration of such a variable working angle mechanism is not particularly limited. For example, the configuration detailed in International Publication No. WO 2006/132059 of the international application can be used.
　図５は、図４に示す排気可変動弁装置６２により制御される第１排気弁ＥＸ１の開弁特性を表した図である。
　上述した排気可変動弁装置６２が備える可変作用角機構によれば、ＥＣＵ５０からの駆動信号に基づいて可変作用角機構が備える油圧式もしくは電動式のアクチュエータ（図示省略）を駆動することにより、図５に示すように、第１排気弁ＥＸ１の作用角（およびリフト量）を連続的に変更させられるようになっている。 FIG. 5 is a diagram showing the valve opening characteristics of the first exhaust valve EX1 controlled by the exhaust variable valve operating apparatus 62 shown in FIG.
According to the variable working angle mechanism provided in the exhaust variable valve device 62 described above, a hydraulic or electric actuator (not shown) provided in the variable working angle mechanism is driven based on a drive signal from the ECU 50, thereby As shown in FIG. 5, the operating angle (and lift amount) of the first exhaust valve EX1 can be continuously changed.
　以上説明した本実施形態の構成によれば、第１排気弁ＥＸ１の作用角を制御することにより、第１排気弁ＥＸ１を通って排出される排気ガス量を調整することができ、従って、第２排気弁ＥＸ２から出てＥＧＲ通路３６を介して吸気通路１６に還流する排気ガス量を調整することが可能となる。このため、第１排気弁ＥＸ１の作用角の調整によって、内燃機関６０の運転中にＥＧＲ率を可変とすることができる。 According to the configuration of the present embodiment described above, the amount of exhaust gas discharged through the first exhaust valve EX1 can be adjusted by controlling the operating angle of the first exhaust valve EX1, and accordingly, the first 2 It is possible to adjust the amount of exhaust gas that exits the exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36. For this reason, the EGR rate can be varied during operation of the internal combustion engine 60 by adjusting the operating angle of the first exhaust valve EX1.
　より具体的には、第１排気弁ＥＸ１の作用角を拡大すると（すなわち、第１排気弁ＥＸ１の開口時間を長くすると）、第１排気弁ＥＸ１を通って流出する排気ガス量が増大する。従って、第２排気弁ＥＸ２から出てＥＧＲ通路３６を介して吸気通路１６に還流する排気ガス量が減少する。これにより、ＥＧＲ率が低下する。逆に、第１排気弁ＥＸ１の作用角を縮小すると（すなわち、第１排気弁ＥＸ１の開口時間を短くすると）、ＥＧＲ率を増大させることができる。 More specifically, when the operating angle of the first exhaust valve EX1 is increased (that is, when the opening time of the first exhaust valve EX1 is increased), the amount of exhaust gas flowing out through the first exhaust valve EX1 increases. Accordingly, the amount of exhaust gas that exits from the second exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36 is reduced. Thereby, an EGR rate falls. Conversely, when the operating angle of the first exhaust valve EX1 is reduced (that is, when the opening time of the first exhaust valve EX1 is shortened), the EGR rate can be increased.
　以上のように、本実施形態の構成によれば、第１排気弁ＥＸ１の作用角を可変とする可変作用角機構を有する排気可変動弁装置６２を備えることにより、ＥＧＲ排出専用気筒Ｄにおける第１排気弁ＥＸ１の開弁特性と第２排気弁ＥＸ２の開弁特性とを相対的に変化させることができる。そして、本実施形態の構成によっても、高温高圧となる排気系に特別な切換弁を備えていなくても、高い信頼性を確保しながらＥＧＲガス量を調整することが可能となる。 As described above, according to the configuration of the present embodiment, the variable exhaust valve operating device 62 having the variable operating angle mechanism that makes the operating angle of the first exhaust valve EX1 variable is provided, so that the The valve opening characteristic of the first exhaust valve EX1 and the valve opening characteristic of the second exhaust valve EX2 can be relatively changed. The configuration of this embodiment also makes it possible to adjust the amount of EGR gas while ensuring high reliability even if the exhaust system that is at high temperature and high pressure is not equipped with a special switching valve.
　ところで、上述した実施の形態２の構成によれば、排気可変動弁装置４８が備える可変作用角機構を用いて第１排気弁ＥＸ１の作用角を制御することにより、内燃機関６０のＥＧＲ率を可変とすることができる。そこで、内燃機関６０のＥＧＲ率が運転状態に応じた目標ＥＧＲ率となるように、ＥＣＵ５０が可変作用角機構を用いて第１排気弁ＥＸ１の作用角を調整する制御を行うようにしてもよい。 By the way, according to the configuration of the second embodiment described above, the EGR rate of the internal combustion engine 60 is controlled by controlling the operating angle of the first exhaust valve EX1 using the variable operating angle mechanism provided in the variable exhaust valve operating device 48. It can be variable. Therefore, the ECU 50 may perform control to adjust the operating angle of the first exhaust valve EX1 using the variable operating angle mechanism so that the EGR rate of the internal combustion engine 60 becomes the target EGR rate corresponding to the operating state. .
　また、上述した実施の形態２においては、第１排気弁ＥＸ１の作用角を可変とする可変作用角機構を有する排気可変動弁装置６２を備えるようにしている。しかしながら、本発明における排気可変動弁装置は、これに限定されるものではない。すなわち、第２排気弁ＥＸ２の作用角を可変とする可変作用角機構を備えて第２排気弁ＥＸ２の作用角を制御することによっても、本発明の特定気筒における第１排気弁ＥＸ１の開弁特性と第２排気弁ＥＸ２の開弁特性とを相対的に変化させることができ、これにより、第２排気弁ＥＸ２から出てＥＧＲ通路３６を介して吸気通路１６に還流するＥＧＲガス量を調整することができる。従って、第１排気弁ＥＸ１に代えて第２排気弁ＥＸ２の作用角を可変とする可変作用角機構を備えるようにしてもよいし、第１排気弁ＥＸ１の作用角を可変とする可変作用角機構とは別に第２排気弁ＥＸ２の作用角を可変とする可変作用角機構を備えるようにしてもよい。 Further, in the second embodiment described above, the exhaust variable valve operating apparatus 62 having a variable working angle mechanism that makes the working angle of the first exhaust valve EX1 variable is provided. However, the exhaust variable valve operating apparatus in the present invention is not limited to this. That is, the valve opening of the first exhaust valve EX1 in the specific cylinder of the present invention is also achieved by controlling the operating angle of the second exhaust valve EX2 by providing a variable operating angle mechanism that makes the operating angle of the second exhaust valve EX2 variable. The characteristics and the valve opening characteristics of the second exhaust valve EX2 can be changed relatively, thereby adjusting the amount of EGR gas that leaves the second exhaust valve EX2 and returns to the intake passage 16 via the EGR passage 36. can do. Therefore, instead of the first exhaust valve EX1, a variable working angle mechanism that makes the working angle of the second exhaust valve EX2 variable may be provided, or a variable working angle that makes the working angle of the first exhaust valve EX1 variable. In addition to the mechanism, a variable working angle mechanism that makes the working angle of the second exhaust valve EX2 variable may be provided.
　ところで、上述した実施の形態１および２においては、気筒Ａ～Ｄの４つの気筒を有し、かつ、そのうちの１つの気筒ＤがＥＧＲ排出専用気筒である直列４気筒型の内燃機関１０または６０を例に挙げて説明を行った。しかしながら、本発明における内燃機関の気筒数は、特に限定されるものではない。ただし、第１排気弁ＥＸ１の開弁特性と第２排気弁ＥＸ２の開弁特性との相対的な調整を行うだけでなく、上述した実施の形態１の内燃機関１０のように第１排気弁ＥＸ１を閉弁停止状態とすることで気筒Ｄからの排気ガスの全量を吸気通路１６に還流可能な構成を備えている場合には、次のような内燃機関が本発明の対象となる。すなわち、少なくとも２つの気筒を有し、そのうちの全部ではない少なくとも１つの気筒を本発明における特定気筒とする内燃機関が本発明の対象となる。 In the first and second embodiments described above, the in-line four-cylinder internal combustion engine 10 or 60 has four cylinders A to D, and one of the cylinders D is a dedicated EGR exhaust cylinder. An explanation was given using as an example. However, the number of cylinders of the internal combustion engine in the present invention is not particularly limited. However, not only the relative adjustment of the valve opening characteristic of the first exhaust valve EX1 and the valve opening characteristic of the second exhaust valve EX2 is performed, but the first exhaust valve as in the internal combustion engine 10 of the first embodiment described above. The following internal combustion engine is an object of the present invention when the exhaust gas from the cylinder D is recirculated to the intake passage 16 by setting the EX1 in the closed valve stop state. In other words, an internal combustion engine having at least two cylinders and at least one of which is a specific cylinder in the present invention is an object of the present invention.
　また、上述した実施の形態１および２においては、ＥＧＲ排出専用気筒Ｄに、２つの排気ポート（第１排気ポート３０ａおよび第２排気ポート３０ｂ）およびこれに対応する２つの排気弁（第１排気弁ＥＸ１および第２排気弁ＥＸ２）を備える内燃機関１０または６０を例に挙げて説明を行った。しかしながら、本発明における特定気筒に設けられる第１および第２排気ポートの数、並びにこれに対応する第１および第２排気弁の数は、上記に限定されるものではない。すなわち、特定気筒に、大気と連通する排気通路に接続される１以上の第１排気ポートと、排気ガス再循環通路に接続される１以上の第２排気ポートと、それらの排気ポートの数に対応する数の第１および第２排気弁とを備える構成であればよい。 In the first and second embodiments described above, the EGR exhaust dedicated cylinder D has two exhaust ports (first exhaust port 30a and second exhaust port 30b) and two exhaust valves corresponding to the exhaust ports (first exhaust port). The description has been given by taking the internal combustion engine 10 or 60 having the valve EX1 and the second exhaust valve EX2) as an example. However, the number of first and second exhaust ports provided in a specific cylinder in the present invention and the number of first and second exhaust valves corresponding thereto are not limited to the above. That is, the specific cylinder has one or more first exhaust ports connected to the exhaust passage communicating with the atmosphere, one or more second exhaust ports connected to the exhaust gas recirculation passage, and the number of those exhaust ports. Any configuration including a corresponding number of first and second exhaust valves may be used.
１０、６０　内燃機関
１２　吸気ポート
１４　吸気弁
１６　吸気通路
２０　エアフローメータ
２６　スロットルバルブ
２８　サージタンク
３０　排気ポート
３０ａ　気筒Ｄの第１排気ポート
３０ｂ　気筒Ｄの第２排気ポート
３２　排気弁
３２ａ　気筒Ｄの第１排気弁ＥＸ１
３２ｂ　気筒Ｄの第２排気弁ＥＸ２
３４　排気通路
３４Ａ～３４Ｄ　排気通路の各枝管部
３６　排気ガス再循環通路（ＥＧＲ通路）
３８　ＥＧＲクーラ
４２　燃料噴射弁
４４　点火プラグ
４６　クランク角センサ
４８、６２　排気可変動弁装置
５０　ＥＣＵ(Electronic Control Unit) 10, 60 Internal combustion engine 12 Intake port 14 Intake valve 16 Intake passage 20 Air flow meter 26 Throttle valve 28 Surge tank 30 Exhaust port 30a First exhaust port 30b of cylinder D Second exhaust port 32 of cylinder D Exhaust valve 32a First exhaust port of cylinder D 1 exhaust valve EX1
32b Second exhaust valve EX2 of cylinder D
34 Exhaust passages 34A to 34D Each branch pipe portion 36 of the exhaust passage 36 Exhaust gas recirculation passage (EGR passage)
38 EGR cooler 42 Fuel injection valve 44 Spark plug 46 Crank angle sensor 48, 62 Exhaust variable valve gear 50 ECU (Electronic Control Unit)

Claims (6)

  1. 　内燃機関の特定気筒に設けられ、大気と連通する排気通路と接続される少なくとも１つの第１排気ポートと、
    　前記特定気筒に設けられた少なくとも１つの第２排気ポートと、
    　前記第２排気ポートと吸気通路とを連通する排気ガス再循環通路と、
    　前記第１排気ポートの開閉を担う少なくとも１つの第１排気弁と、
    　前記第２排気ポートの開閉を担う少なくとも１つの第２排気弁と、
    　前記第１排気弁および前記第２排気弁のうちの少なくとも一方の開弁特性を可変とする排気可変動弁装置と、
    　を備えることを特徴とする排気ガス再循環装置付き内燃機関。     At least one first exhaust port provided in a specific cylinder of the internal combustion engine and connected to an exhaust passage communicating with the atmosphere;
    At least one second exhaust port provided in the specific cylinder;
    An exhaust gas recirculation passage communicating the second exhaust port and the intake passage;
    At least one first exhaust valve responsible for opening and closing the first exhaust port;
    At least one second exhaust valve responsible for opening and closing the second exhaust port;
    An exhaust variable valve operating apparatus that varies a valve opening characteristic of at least one of the first exhaust valve and the second exhaust valve;
    An internal combustion engine with an exhaust gas recirculation device.
  2. 　前記排気可変動弁装置は、前記第１排気弁の開弁特性と前記第２排気弁の開弁特性とを相対的に変化させる動弁装置であることを特徴とする請求項１記載の排気ガス再循環装置付き内燃機関。 2. The exhaust according to claim 1, wherein the variable exhaust valve operating device is a valve operating device that relatively changes a valve opening characteristic of the first exhaust valve and a valve opening characteristic of the second exhaust valve. Internal combustion engine with gas recirculation device.
  3. 　前記特定気筒は、前記内燃機関が備える気筒の全部ではない少なくとも１つの気筒であり、
    　前記排気可変動弁装置は、前記第１排気弁を閉弁位置で停止可能な第１弁停止機構を含むことを特徴とする請求項１または２記載の排気ガス再循環装置付き内燃機関。     The specific cylinder is at least one cylinder that is not all of the cylinders included in the internal combustion engine,
    3. The internal combustion engine with an exhaust gas recirculation device according to claim 1, wherein the exhaust variable valve operating device includes a first valve stop mechanism capable of stopping the first exhaust valve at a valve closing position.
  4. 　前記排気可変動弁装置は、前記第２排気弁を閉弁位置で停止可能な第２弁停止機構を含み、
    　前記内燃機関は、燃焼が不安定となる所定の運転条件では、前記第２弁停止機構を用いて前記第２排気弁を閉弁位置で停止させる弁停止実行手段を更に備えることを特徴とする請求項１乃至３の何れか１項記載の排気ガス再循環装置付き内燃機関。     The exhaust variable valve operating apparatus includes a second valve stop mechanism capable of stopping the second exhaust valve at a closed position,
    The internal combustion engine further includes valve stop execution means for stopping the second exhaust valve at a closed position using the second valve stop mechanism under a predetermined operating condition in which combustion becomes unstable. An internal combustion engine with an exhaust gas recirculation device according to any one of claims 1 to 3.
  5. 　前記排気可変動弁装置は、前記第１排気弁および前記第２排気弁のうちの少なくとも一方の作用角を可変とする可変作用角機構を含むことを特徴とする請求項１または２記載の排気ガス再循環装置付き内燃機関。 3. The exhaust according to claim 1, wherein the variable exhaust valve operating system includes a variable working angle mechanism that varies a working angle of at least one of the first exhaust valve and the second exhaust valve. Internal combustion engine with gas recirculation device.
  6. 　前記内燃機関は、排気ガス再循環率が目標排気ガス再循環率となるように、前記可変作用角機構を用いて前記第１排気弁および前記第２排気弁のうちの少なくとも一方の作用角を調整する作用角調整手段を更に備えることを特徴とする請求項５記載の排気ガス再循環装置付き内燃機関。 The internal combustion engine uses the variable working angle mechanism to set the working angle of at least one of the first exhaust valve and the second exhaust valve so that the exhaust gas recirculation rate becomes the target exhaust gas recirculation rate. 6. The internal combustion engine with an exhaust gas recirculation device according to claim 5, further comprising operating angle adjusting means for adjusting.
PCT/JP2010/054976 2010-03-23 2010-03-23 Internal combustion engine with exhaust gas recirculation device WO2011117970A1 (en)

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FR3005110A1 (en) * 2013-04-30 2014-10-31 Peugeot Citroen Automobiles Sa EXHAUST GAS RECIRCULATION COMBUSTION ENGINE WITH SELECTED RECIRCULATION RATE
CN105201661A (en) * 2014-06-19 2015-12-30 福特环球技术公司 Systems And Methods For Stopping And Starting An Engine With Dedicated Egr
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JP2018131950A (en) * 2017-02-14 2018-08-23 トヨタ自動車株式会社 Control device for internal combustion engine
DE102013211366B4 (en) 2012-06-22 2022-08-18 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Engine with dedicated EGR exhaust port and independently deactivatable exhaust valves

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JP2013124585A (en) * 2011-12-14 2013-06-24 Hino Motors Ltd Internal combustion engine
DE102013211366B4 (en) 2012-06-22 2022-08-18 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Engine with dedicated EGR exhaust port and independently deactivatable exhaust valves
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US10473044B2 (en) 2017-02-14 2019-11-12 Toyota Jidosha Kabushiki Kaisha Control device for internal combustion engine

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