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WO2024201933A1 - Moteur à combustion interne avec chambre de combustion auxiliaire - Google Patents

Moteur à combustion interne avec chambre de combustion auxiliaire Download PDF

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Publication number
WO2024201933A1
WO2024201933A1 PCT/JP2023/013307 JP2023013307W WO2024201933A1 WO 2024201933 A1 WO2024201933 A1 WO 2024201933A1 JP 2023013307 W JP2023013307 W JP 2023013307W WO 2024201933 A1 WO2024201933 A1 WO 2024201933A1
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WO
WIPO (PCT)
Prior art keywords
combustion chamber
partition wall
main combustion
communication passage
communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/013307
Other languages
English (en)
Japanese (ja)
Inventor
敏之 山田
欣也 井上
伸治 林
貴之 城田
大 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to PCT/JP2023/013307 priority Critical patent/WO2024201933A1/fr
Priority to JP2025509527A priority patent/JPWO2024201933A1/ja
Publication of WO2024201933A1 publication Critical patent/WO2024201933A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/12—External control gear, e.g. having dash-pots
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an internal combustion engine having a secondary combustion chamber within a main combustion chamber.
  • injector fuel injection device
  • spark plug that is positioned facing the combustion chamber inside the cylinder.
  • Patent Document 1 discloses an internal combustion engine equipped with a secondary combustion chamber within a combustion chamber (main combustion chamber).
  • a mixture with a relatively high fuel concentration is supplied to the secondary combustion chamber, and the mixture in the secondary combustion chamber is ignited by an ignition plug, causing a flame to be injected (ejected) from the secondary combustion chamber into the main combustion chamber and burn the mixture in the main combustion chamber.
  • This makes it possible to improve the ignition of the mixture in the main combustion chamber and increase the output of the internal combustion engine, or to reduce the fuel concentration in the main combustion chamber and improve fuel efficiency.
  • Patent Document 1 discloses an internal combustion engine that has multiple nozzle holes that inject flames from an auxiliary combustion chamber, and is configured so that the flames are injected radially toward the cylinder wall surface.
  • the present invention was made to solve these problems, and aims to provide an internal combustion engine with a pre-combustion chamber that promotes combustion in the pre-combustion chamber.
  • the internal combustion engine with an auxiliary combustion chamber of the present invention comprises a main combustion chamber formed by a cylinder head, a cylinder block, and a piston, an auxiliary combustion chamber provided in the cylinder head and partitioned from the main combustion chamber by a partition wall, a fuel injection device that supplies fuel to the main combustion chamber, and an ignition device that ignites in the auxiliary combustion chamber, and the partition wall is provided with a communication passage that connects the auxiliary combustion chamber to the main combustion chamber, the communication passage having a first communication passage that is provided at the end of the partition wall on the piston side and communicates in the axial direction of the main combustion chamber, and the auxiliary combustion chamber is formed so that the side opposite the piston extends along an axis that is inclined in a predetermined direction with respect to the axis of the main combustion chamber.
  • the communication passage has a plurality of second communication passages arranged in a line circumferentially around the partition wall, the plurality of second communication passages are arranged at the same position in the axial direction of the main combustion chamber, and the extension lines of the plurality of second communication passages are arranged so as to intersect with the extension line of the first communication passage.
  • the fuel that has passed through the multiple second communication passages and flowed into the auxiliary combustion chamber collides on an extension of the first communication passage, generating a flow that moves along the extension of the first communication passage in the opposite direction to the first communication passage. Therefore, a strong swirling flow of the mixture can be generated in the auxiliary combustion chamber by the fuel that has passed through the first and second communication passages and flowed into the auxiliary combustion chamber.
  • the second communication passage located on the predetermined direction side of the partition wall has a larger path cross-sectional area than the other second communication passages.
  • a large amount of the mixture flows in from the second communication passages that are located on the predetermined direction side among the plurality of second communication passages, and a strong swirling flow of the mixture can be generated in the auxiliary combustion chamber.
  • the fuel injection device is provided on the partition wall of the main combustion chamber in the specified direction, and among the plurality of second communication passages, the second communication passage directly facing the fuel injection position of the fuel injection device has a larger opening area on the main combustion chamber side than the other second communication passages.
  • the fuel injected from the fuel injection device flows more into the second communication passage that faces directly out of the multiple second communication passages. Therefore, the penetrating force of the fuel injection can generate a strong swirling flow of the mixture in the auxiliary combustion chamber.
  • the ignition device is a spark plug
  • the central electrode of the spark plug is disposed on the central axis of the auxiliary combustion chamber
  • the ground electrode of the spark plug is disposed laterally with respect to a plane that passes through the central axis of the auxiliary combustion chamber and extends in the predetermined direction.
  • the internal combustion engine with a pre-combustion chamber of the present invention can generate a swirling flow in the pre-combustion chamber, suppressing uneven distribution of the air-fuel mixture in the pre-combustion chamber and promoting combustion in the pre-combustion chamber. This allows a strong flame to be generated in the pre-combustion chamber and injected into the main combustion chamber, improving combustibility in the main combustion chamber and improving output or fuel efficiency.
  • FIG. 1 is a configuration diagram of an intake and exhaust system of an internal combustion engine according to an embodiment of the present invention
  • FIG. 2 is a top view of a cylinder in the internal combustion engine of the present embodiment.
  • FIG. 4 is a vertical cross-sectional view of the inside of a cylinder showing a fuel injection state.
  • FIG. 4 is a vertical cross-sectional view showing a detailed shape of an upper part of the cylinder.
  • FIG. 4 is a vertical cross-sectional view of an upper part of a cylinder, showing a state of fuel movement within an auxiliary combustion chamber.
  • FIG. 1 is a configuration diagram of an intake and exhaust system of an internal combustion engine 1 (an internal combustion engine with an auxiliary combustion chamber) according to one embodiment of the present invention.
  • the internal combustion engine 1 of this embodiment is a direct injection type gasoline engine having an injector 3 (fuel injection device) that injects gasoline, which is a fuel, into a combustion chamber.
  • an air cleaner 6, an intercooler 7, and a throttle valve 8 are provided upstream of the intake port 2 along the flow of intake air.
  • an upstream side exhaust purification catalyst 12 and a downstream side exhaust purification catalyst 13 are provided along the flow of exhaust gas from the exhaust port 31.
  • the internal combustion engine 1 is also equipped with a turbocharger 15 and an EGR system 16 .
  • the EGR system 16 includes an EGR passage 20 that connects the exhaust passage 11 and the intake passage 5 of the internal combustion engine 1, an EGR valve 21 that changes the flow area of the EGR passage 20, and an EGR cooler 22 that cools the exhaust passing through the EGR passage 20.
  • the EGR passage 20 connects the exhaust passage 11 between the upstream side exhaust purification catalyst 12 and the downstream side exhaust purification catalyst 13, and the intake passage 5 between the air cleaner 6 and the compressor of the turbocharger 15.
  • Fig. 2 is a top view of the inside of a cylinder 30 in the internal combustion engine 1 of this embodiment.
  • Fig. 3 is a vertical cross-sectional view of the inside of the cylinder showing a fuel injection state.
  • the internal combustion engine 1 is provided with two intake ports 2 and two exhaust ports 31 for each cylinder 30. Furthermore, each of the two intake ports 2 is provided with an intake valve 32, and each of the two exhaust ports 31 is provided with an exhaust valve 33.
  • the injector 3 is provided in the cylinder head 34, one for each cylinder, and is disposed circumferentially between the two intake ports 2.
  • the injector 3 is disposed so as to inject fuel toward the combustion chamber, more specifically, toward an upper portion of the center of a main combustion chamber 41, which will be described later.
  • An ignition plug 35 (ignition device) is provided in the center of the cylinder head 34.
  • a main combustion chamber 41 is provided, which is a substantially cylindrical space surrounded by a cylinder block 36, a cylinder head 34, and a piston 37, and a sub-combustion chamber 43 is provided in the upper center of the main combustion chamber 41.
  • a partition wall 42 is provided in the cylinder head 34 so as to surround a center electrode 35a of the ignition plug 35, and the portion surrounded by the partition wall 42 in the main combustion chamber 41 becomes the sub-combustion chamber 43.
  • the main combustion chamber 41 has a substantially circular cross section taken along a plane perpendicular to the moving direction of the piston 37.
  • the partition wall 42 is formed in a cylindrical shape that protrudes downward (toward the piston 37) from the ignition plug 35, and has a substantially hemispherical lower part, and is disposed so as to cover the center electrode 35a and the ground electrode 35b of the ignition plug 35.
  • the center electrode 35a of the ignition plug 35 is located in the upper center of the sub-combustion chamber 43, i.e., in the upper part of the partition wall 42 and on the central axis.
  • the partition wall 42 has multiple communication passages 44a, 44b, 44c that connect the main combustion chamber 41 and the auxiliary combustion chamber 43.
  • the operation of the internal combustion engine 1 is controlled by a control unit 50 (control unit).
  • the control unit 50 is composed of an output device, a storage device (ROM, RAM, non-volatile RAM, etc.), a central processing unit (CPU), etc.
  • the control unit 50 acquires the crank angle, intake volume, exhaust temperature, EGR gas volume, etc., and controls the operation of the injector 3, spark plug 35, throttle valve 8, EGR valve 21, etc.
  • the partition wall 42 and spark plug 35 of this embodiment are positioned near the central axis of the cylinder 30, with their upper portions (the side opposite the piston 37) inclined toward the intake side (the intake valve 32 side: the specified direction in this invention) with respect to the axis CL1 of the cylinder 30 (the central axis of the main combustion chamber 41).
  • the upper portions of the partition wall 42 and the central axis CL2 of the auxiliary combustion chamber 43 therein are inclined toward the intake side with respect to the axis CL1 of the cylinder 30.
  • a plurality of (for example, eight) communication passages 44 a, 44 b are arranged at substantially equal intervals in the circumferential direction of the partition wall 42 .
  • the communication passages 44 a and 44 b are provided at a position slightly below the upper end of the hemispherical portion of the lower part of the partition wall 42 .
  • one communication passage 44a is provided in a position directly facing the injector 3.
  • the fuel injected from the injector 3 is mainly injected toward the communication passage 44a.
  • the communication passages 44a, 44b are arranged on the same plane perpendicular to the axis CL1 of the cylinder 30.
  • the communication passages 44a, 44b extend at an angle to the plane perpendicular to the axis CL1 of the cylinder 30, and are inclined upward (toward the spark plug 35) from the main combustion chamber 41 toward the auxiliary combustion chamber 43.
  • the axes of the communication passages 44a, 44b are set to intersect at the same intersection CP1 on the axis CL2 of the partition wall 42.
  • the partition wall 42 is located near the central axis of the cylinder 30, and the intersection CP1 of the axes of the communication passages 44a and 44b is located on the axis CL1 of the cylinder 30.
  • a communication passage 44c (first communication passage) is provided at the lower end of the partition wall 42. More specifically, the communication passage 44c is provided at a position of the partition wall 42 closest to the piston 37, and extends on the axis CL1 of the cylinder 30. The intersection CP1 of the axes of the communication passages 44a and 44b is located on an extension of the communication passage 44c.
  • the internal combustion engine 1 of this embodiment is provided with an auxiliary combustion chamber 43 partitioned by a partition wall 42 in the upper center of the main combustion chamber 41.
  • the partition wall 42 is provided with communication passages 44a, 44b, and 44c that connect the main combustion chamber 41 and the auxiliary combustion chamber 43.
  • this embodiment uses a direct-injection type injector 3, which first injects fuel to supply it into the main combustion chamber 41. Then, it injects again to supply fuel to the auxiliary combustion chamber 43.
  • the injector 3 is positioned to inject fuel toward the auxiliary combustion chamber 43, and as the piston 37 moves in the compression direction while injecting fuel, some of the fuel that has reached the vicinity of the auxiliary combustion chamber 43 flows into the auxiliary combustion chamber 43 from the communication passages 44a, 44b, and 44c. The remaining fuel that does not flow into the auxiliary combustion chamber 43 is mixed with the intake air in the main combustion chamber 41, just like the fuel that was initially injected.
  • the flame generated by ignition in the auxiliary combustion chamber 43 passes through the connecting passages 44a, 44b, and 44c and is injected into the main combustion chamber 41, combusting the mixture in the main combustion chamber 41.
  • the lower end of the partition wall 42 is provided with a communication passage 44c, which extends parallel to the axis CL1 of the cylinder 30. During the compression stroke when the piston 37 moves upward, fuel flows from the communication passage 44c toward the upper part of the auxiliary combustion chamber 43.
  • the central axis CL2 of the auxiliary combustion chamber 43 is inclined toward the intake side at its upper part with respect to the axis CL1 of the cylinder 30, so that the fuel that flows into the auxiliary combustion chamber 43 from the communication passage 44c moves from the center of the auxiliary combustion chamber 43 toward a position biased toward the exhaust side. Then, when it collides with the ignition plug 35 and turns around, a swirling flow is generated in the auxiliary combustion chamber as shown by the arrows in Figure 5. This promotes the diffusion of fuel in the auxiliary combustion chamber 43, improving the combustibility in the auxiliary combustion chamber 43.
  • a strong flame is generated in the auxiliary combustion chamber 43 and injected into the main combustion chamber 41 from the connecting passages 44a, 44b, and 44c, which increases the combustibility of the mixture in the main combustion chamber 41, improving the output of the internal combustion engine 1 or improving fuel efficiency by reducing the amount of fuel injection. It is also possible to prevent unburned gas from leaking out of the main combustion chamber 41.
  • the partition wall 42 is provided with a plurality of communication passages 44a, 44b arranged in the circumferential direction, so that during the compression stroke, fuel also flows into the auxiliary combustion chamber 43 through the communication passages 44a, 44b.
  • the extension lines of the communicating passages 44a, 44b are inclined upwardly on the opposite side to the communicating passage 44c with respect to a direction perpendicular to the extension line of the communicating passage 44c (the axis CL1 of the cylinder 30) and are arranged so as to intersect on the extension line (CL1) of the communicating passage 44c. Therefore, the fuel flowing in from the communicating passages 44a, 44b collides on the extension line (CL1) of the communicating passage 44c, generating a flow that moves toward the upper part of the auxiliary combustion chamber 43 along the extension line of the communicating passage 44c.
  • a swirling flow of the mixture can be generated in the auxiliary combustion chamber 43 by the fuel that flows from the main combustion chamber 41 through the communication passages 44 a , 44 b , and 44 c into the auxiliary combustion chamber 43 .
  • the communication passage 44a located on the side in the direction in which the upper part of the auxiliary combustion chamber 43 slopes is formed to have a larger path cross-sectional area on the main combustion chamber 41 side than the other communication passages 44b. Therefore, since more fuel flows in from the communication passage 44a out of the multiple communication passages 44a, 44b, a strong swirling flow of the mixture can be generated in the auxiliary combustion chamber 43.
  • the communication passage 44a directly facing the fuel injection port 3a of the injector 3 allows fuel to flow directly into the communication passage 44a by injection from the injector 3.
  • the communication passage 44a directly facing the fuel injection port 3a has a larger opening area on the main combustion chamber 41 side than the other communication passages 44b, so that the penetrating force of the fuel injection strongly flows fuel from the communication passage 44a toward the exhaust side of the auxiliary combustion chamber 43.
  • the partition wall 42 has a plurality of communication passages 44a, 44b arranged at approximately equal intervals in the circumferential direction, so that flames are injected from the auxiliary combustion chamber 43 radially outwardly of the main combustion chamber 41 over the entire circumference. This can promote combustibility in the main combustion chamber 41.
  • the size of the opening area and opening direction on the main combustion chamber 41 side of the communicating passages 44a, 44b can be appropriately set. This enables the flame to propagate evenly within the main combustion chamber 41, thereby improving the combustibility in the main combustion chamber 41.
  • the partition wall 42 has a total of eight communication passages 44a and 44b arranged in the circumferential direction, but the number may be more than eight or may be any other number.
  • one cylinder is provided with two intake valves 32 and two exhaust valves 33, but the present invention can be applied to an internal combustion engine with other numbers, such as one intake valve 32 and one exhaust valve 33.
  • the internal combustion engine of the present invention can be applied to various internal combustion engines for driving automobiles, etc.
  • a direct-injection type injector 3 is used as the fuel injection device that supplies fuel to the main combustion chamber 41, but a type that supplies fuel to the intake port can also be used.
  • fuel flows into the auxiliary combustion chamber 43 as an air-fuel mixture, not as injected fuel.
  • a secondary combustion chamber is used that is inclined toward the intake side, but even if it is inclined in a direction different from the intake and exhaust side, such as toward the exhaust side or a direction perpendicular to the intake and exhaust direction, a swirling flow can be generated in the secondary combustion chamber, and the bias of the mixture in the secondary combustion chamber can be suppressed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

La présente invention porte sur un moteur à combustion interne qui comprend : une chambre de combustion principale 41 qui est formée à partir d'une culasse 34, d'un bloc-cylindres 36 et d'un piston 37 ; une chambre de combustion auxiliaire 43 qui est disposée dans la culasse 34 et séparée de la chambre de combustion principale 41 par une paroi de séparation 42 ; et un passage de communication 44c qui est formé dans la paroi de séparation 42 et fournit une communication entre la chambre de combustion auxiliaire 43 et la chambre de combustion principale 41. Le passage de communication 44c a un passage de communication 44c qui est disposé au niveau d'une partie d'extrémité côté piston de la paroi de séparation 42 et s'étend parallèlement à un axe central CL1 de la chambre de combustion principale 43, et la chambre de combustion auxiliaire 43 est formée de façon à s'étendre le long d'un axe CL2 dont la partie supérieure est inclinée par rapport à l'axe central CL1 du bloc-cylindres 36.
PCT/JP2023/013307 2023-03-30 2023-03-30 Moteur à combustion interne avec chambre de combustion auxiliaire Pending WO2024201933A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2023/013307 WO2024201933A1 (fr) 2023-03-30 2023-03-30 Moteur à combustion interne avec chambre de combustion auxiliaire
JP2025509527A JPWO2024201933A1 (fr) 2023-03-30 2023-03-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/013307 WO2024201933A1 (fr) 2023-03-30 2023-03-30 Moteur à combustion interne avec chambre de combustion auxiliaire

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WO2024201933A1 true WO2024201933A1 (fr) 2024-10-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399110A (en) * 1977-02-08 1978-08-30 Daihatsu Motor Co Ltd Internal combustion engine having precombustion chamber
JPH06307247A (ja) * 1993-04-26 1994-11-01 Mitsubishi Heavy Ind Ltd 副室式内燃機関の燃焼室
JP2009270540A (ja) * 2008-05-09 2009-11-19 Osaka Gas Co Ltd エンジン及びエンジン用点火プラグ
WO2020196685A1 (fr) * 2019-03-27 2020-10-01 三菱自動車工業株式会社 Moteur à combustion interne à chambre secondaire
WO2021157322A1 (fr) * 2020-02-05 2021-08-12 株式会社デンソー Système d'allumage de type à chambre auxiliaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399110A (en) * 1977-02-08 1978-08-30 Daihatsu Motor Co Ltd Internal combustion engine having precombustion chamber
JPH06307247A (ja) * 1993-04-26 1994-11-01 Mitsubishi Heavy Ind Ltd 副室式内燃機関の燃焼室
JP2009270540A (ja) * 2008-05-09 2009-11-19 Osaka Gas Co Ltd エンジン及びエンジン用点火プラグ
WO2020196685A1 (fr) * 2019-03-27 2020-10-01 三菱自動車工業株式会社 Moteur à combustion interne à chambre secondaire
WO2021157322A1 (fr) * 2020-02-05 2021-08-12 株式会社デンソー Système d'allumage de type à chambre auxiliaire

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Publication number Publication date
JPWO2024201933A1 (fr) 2024-10-03

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