WO2021161553A1 - 副室式火花点火エンジン - Google Patents

副室式火花点火エンジン Download PDF

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Publication number
WO2021161553A1
WO2021161553A1 PCT/JP2020/025900 JP2020025900W WO2021161553A1 WO 2021161553 A1 WO2021161553 A1 WO 2021161553A1 JP 2020025900 W JP2020025900 W JP 2020025900W WO 2021161553 A1 WO2021161553 A1 WO 2021161553A1
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WIPO (PCT)
Prior art keywords
chamber
sub
fuel
main
end side
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.)
Ceased
Application number
PCT/JP2020/025900
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English (en)
French (fr)
Japanese (ja)
Inventor
山田　敏之
欣也 井上
貴之 城田
一成 野中
晃弘 津田
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
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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 JP2022500215A priority Critical patent/JP7226639B2/ja
Publication of WO2021161553A1 publication Critical patent/WO2021161553A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/08—Engines characterised by precombustion chambers the chamber being of air-swirl type
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • 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 a sub-chamber type spark ignition engine provided with a system for igniting the air-fuel mixture in the main chamber by ejecting a flame formed by igniting the air-fuel mixture in the sub-chamber into the main chamber.
  • a sub-combustion chamber (also called a sub-chamber) separated from the main combustion chamber (also called a main chamber) by a partition is provided, and a communication passage connecting these main chamber and the sub-chamber to each other is formed in the partition. Then, the air-fuel mixture in the sub-chamber is ignited, and the flame formed in the sub-chamber at this time is ejected into the main room through the communication passage to ignite the air-fuel mixture in the main room (also called a jet ignition system).
  • a sub-chamber spark ignition engine is known (see, for example, Patent Document 1).
  • the fuel supply form of the jet ignition system as described above includes a passive system in which fuel is supplied to the sub-chamber via the main chamber and an active system in which fuel is directly supplied to the sub-chamber.
  • FIG. 7 the configuration shown in FIG. 7 was considered as a sub-chamber spark ignition engine equipped with a passive jet ignition system. That is, as shown in FIG. 7, a partition wall 123 for partitioning the sub chamber 122 is arranged inside in the region including the bore central axis of the upper portion of the main chamber 121 (ceiling wall portion on the cylinder head 103 side), and the main chamber is provided.
  • the injector 117 is arranged on the side wall portion 111a of 121.
  • a plurality of communication passages 124 communicating the main chamber 121 and the sub chamber 122 are formed in the partition wall 123, and one of the communication passages 124 is used as a fuel supply passage 124a.
  • the injector 117 is arranged so that the fuel injection direction is toward the fuel supply path 124a.
  • This case was created by paying attention to such issues, and enables stable ignition in the sub-chamber in a sub-chamber spark ignition engine equipped with a passive jet ignition system. That is one of the purposes. Not limited to this purpose, it is also an action and effect derived by each configuration shown in the embodiment for carrying out the invention described later, and it is also for another purpose of this case to exert an action and effect that cannot be obtained by the conventional technique. be.
  • the sub-chamber spark ignition engine of the present invention includes a main chamber, a sub-chamber partitioned by the main chamber and a partition wall, a plurality of passages provided in the partition wall and communicating the main chamber and the sub-chamber, and the above-mentioned
  • a spark plug provided in the central axis of the sub-chamber or in the vicinity of the central axis to ignite the air-fuel mixture in the sub-chamber is provided, and a flame formed in the sub-chamber by ignition of the air-fuel mixture in the sub-chamber is provided.
  • a sub-chamber type spark ignition engine that is ejected into the main chamber through the continuous passage to ignite the air-fuel mixture in the main chamber, and the continuous passage is directed toward the central axis of the sub-chamber.
  • a swirl flow generation passage that is formed at an inclined angle with respect to the main chamber and generates a swirl flow in the sub chamber by compressed air from the main chamber, and the swirl flow generation in a direction toward the central axis of the sub chamber. It is characterized in that it is formed at an angle different from that of the communication passage, and includes a fuel inflow communication passage for supplying fuel from the main chamber side to the sub chamber.
  • the swirl flow generation passage and the fuel inflow passage are formed on one end side of the sub chamber, and the spark plug is formed on the other end side of the sub chamber, and the swirl flow generation passage and the fuel inflow passage are formed.
  • the passage is formed so as to be inclined from one end side toward the other end side as it goes from the main chamber to the sub chamber, and an extension line of the fuel inflow communication passage is a surface of the partition wall on the sub chamber side.
  • the position to reach the wall surface of the sub-chamber is preferably the other end side of the position where the extension line of the swirl flow generation communication passage reaches the wall surface of the sub-chamber.
  • the other end side of the sub-chamber wall surface is a cylindrical inner wall surface formed in a cylindrical shape, and the extension line of the fuel inflow communication passage reaches the cylindrical inner wall surface.
  • the one end side of the sub-chamber wall surface is formed with a reduced diameter inner wall surface whose cross-sectional area gradually decreases from the other end side toward the one end side.
  • the one end side recess is formed on the surface of the partition wall on the main chamber side, and the fuel inflow communication passage is formed in the recess.
  • the main chamber is provided with a fuel injection valve for injecting fuel
  • the recess is provided with a receiving surface on which the direct injection fuel from the fuel injection valve collides.
  • the fuel injected into the main chamber can concentrate the rich mixture of fuel around the spark plug in the sub chamber by the swirl flow generated in the sub chamber. As a result, stable ignition can be realized, and the amount of fuel supplied to the sub-chamber can be suppressed.
  • FIGS. 1A and 1B are views showing the configuration of a combustion chamber of one cylinder of the subchamber type spark ignition engine according to the embodiment
  • FIG. 1A is a vertical sectional view thereof
  • FIG. 1B is a top view thereof
  • 2A and 2B are views for explaining the characteristics of the communication passage formed in the partition wall of the sub-chamber type spark ignition engine shown in FIGS. 1A and 1B
  • FIG. 2A is a main part of the sub-chamber showing the orientation of the communication passage.
  • 2B is a schematic cross-sectional view of the above
  • FIG. 2B is a vertical cross-sectional view of the sub chamber.
  • FIGS. 1A and 1B are perspective views showing the shape of a modified example of the concave portion of the sub chamber of the subchamber type spark ignition engine shown in FIGS. 1A and 1B.
  • FIG. 3A shows the first modified example
  • FIG. 3B shows the first modified example.
  • a second modification is shown.
  • 4A and 4B are schematic perspective views for explaining the state of gas flow in the sub-chamber of the sub-chamber type spark ignition engine shown in FIGS. 1A and 1B
  • FIG. 4A shows the protrusion of the recess into the sub-chamber.
  • FIG. 4B shows a case where the protrusion of the recess into the sub-chamber is taken into consideration.
  • FIGS. 5A to 5C are vertical cross-sectional views of the combustion chamber showing the fuel injection modes of the sub-chamber spark ignition engine shown in FIGS. 1A and 1B in the order of strokes in FIGS. 5A to 5C.
  • FIG. 6 is a diagram showing a modified example of the sub chamber of the sub chamber type spark ignition engine shown in FIGS. 1A and 1B.
  • FIG. 7 is a vertical cross-sectional view of the combustion chamber for explaining the problem of this case.
  • the sub-chamber type spark ignition engine (which is a spark ignition type internal combustion engine and includes a gasoline engine; hereinafter, also simply referred to as “engine”) 1 according to the present embodiment is a multi-cylinder engine, and each cylinder is shown in FIG.
  • FIG. 1A the cylinder 11 formed in the cylinder block 2, the piston 12 reciprocating in the cylinder 11, the intake port 13 and the exhaust port 14 formed in the cylinder head 3, and the intake port 13 are equipped.
  • the intake valve 15 and the exhaust valve 16 provided in the exhaust port 14 are provided.
  • two intake ports 13 (15 intake valves) and two exhaust ports 14 (exhaust valves 16) are provided, but the number of intake ports (number of intake valves).
  • the number of exhaust ports (the number of exhaust valves) are not limited to this.
  • the combustion chamber 20 is partitioned by the inner wall of the cylinder 11, the top surface 12a of the piston 12, and the cylinder head 2.
  • An intake port 13 opened and closed by an intake valve 15 and an exhaust port 14 opened and closed by an exhaust valve 16 are connected to the combustion chamber 20 so as to communicate with each other.
  • the top of the combustion chamber 20 is formed in a pent roof shape having an intake slope provided with the intake valve 15 and an exhaust slope provided with the exhaust valve 16.
  • a fuel injection valve 17 is provided on the peripheral wall 11a at the top of the cylinder 11 (upper part in FIG. 1A). It is configured as a direct injection engine). In the present embodiment, only the fuel injection valve 17 that injects fuel directly into the cylinder 11 is provided, but in addition to this, a fuel injection valve for port injection that injects fuel into the intake port 13 may be added. ..
  • the engine according to the present embodiment is a spark ignition type engine, and is a spark-ignition engine in the combustion chamber 20 at the top of the combustion chamber 20 (here, the top of the pent roof shape) 20a, in the vicinity of the bore central axis or the bore central axis.
  • the ignition plug 18 is equipped with the 18a exposed.
  • the top 20a of the combustion chamber 20 is provided with a partition wall 23 that divides the internal space of the combustion chamber 20 into a main chamber (main combustion chamber) 21 and a sub chamber (sub combustion chamber) 22.
  • the partition 23 is arranged so as to cover the space where the spark discharge portion 18a of the spark plug 18 is exposed, and the internal space (the space including the spark discharge portion 18a) covered by the partition 23 in the combustion chamber 20 is the sub chamber 22.
  • the external space of the partition wall 23 in the combustion chamber 20 is the main chamber 21.
  • the sub chamber 22 is formed in a rotating body shape except for a part.
  • the partition wall 23 is formed with a plurality of (six in this embodiment) communication passages (also referred to as “nozzles”) 24 that communicate the main chamber 21 and the sub chamber 22.
  • a plurality of (six in this embodiment) communication passages 24 are used to allow the inflow of the air-fuel mixture from the main chamber 21 side to the sub-chamber 22 and the outflow of flame from the sub-chamber 22 side to the main chamber 21 side. It is provided.
  • a part (here, one) of the plurality of communication passages 24 functions as a fuel inflow communication passage 24a for introducing the fuel injected into the main chamber 21 from the fuel injection valve 17 into the sub chamber 22, and the other passages 24.
  • the communication passage 24 functions as an air inflow communication passage for introducing the air in the main chamber 21 (strictly speaking, an air-fuel mixture leaning fuel) into the sub chamber 22.
  • the fuel injection valve 17 includes an injection port for supplying fuel into the sub chamber 22.
  • the fuel (air-fuel mixture containing a large amount of fuel) introduced through the fuel inflow passage 24a is ignited by the ignition plug 18 at a predetermined timing in the compression stroke, and the sub-chamber 22 is ignited by this ignition.
  • the flame formed inside is jetted into the main chamber 21 through a plurality of communication passages 24 to ignite the air-fuel mixture in the main chamber 21 and promote combustion.
  • Such an ignition system also called a jet ignition system, is effective in igniting a dilute mixture and promoting combustion, and can be applied to lean burn in the main chamber 21 or a large amount of EGR, thereby improving fuel efficiency. Become.
  • the direct injection fuel from the fuel injection valve 17 collides with the outer surface of the sub chamber 22 (that is, the outer surface of the partition wall 23) around the opening 24b where the fuel inflow communication passage 24a opens.
  • a recess 30 having a receiving surface 30a is formed.
  • the recess 30 of the present embodiment is formed in the shape of a mortar formed by a smooth curved surface.
  • the opening 24b is arranged at or near the bottom of the mortar-shaped recess 30.
  • the shape of the recess 30 is not limited to this, and it is sufficient that the diameter of the recess 30 is gradually reduced from the outside to the inside of the sub chamber 22, for example, a funnel (funnel) using a conical surface such as a conical surface. ) May be in shape. That is, it may be formed by using a conical surface like the concave portion 30A shown as a modified example in FIG. 3A, or may be formed by using a pyramidal surface like the concave portion 30B shown as a modified example in FIG. 3B. In the example shown in FIG. 3B, a quadrangular pyramid surface is used, but other pyramid surfaces can also be applied.
  • the wide side B (corresponding to the opening of the concave portion 30) and the narrow side T (corresponding to the bottom surface portion of the concave portion 30) of the conical surface are circular. And regular polygons, but may be ellipses and other polygons. Further, as shown in the recesses 30A and 30B shown in FIGS. 3A and 3B, the lines (L1 and L2 in FIG. 3) connecting the center of the wide side B of the conical surface and the center of the narrow side T of the conical surface are the lines of the frustum.
  • FIGS. 3A and 3B An inner surface shape of a frustum inclined with respect to the bottom surface B or the top surface T (that is, a frustum in which the top surface T is laterally displaced with respect to the bottom surface B) may be applied.
  • the recesses 30A and 30B are shown obliquely downward in correspondence with FIGS. 1A and 1B.
  • the opening 24b of the fuel inflow passage 24a is arranged at the deepest part (bottom) of the recesses 30A and 30B, but the arrangement of the opening 24b is limited to this. No. Further, the number of openings 24b (the number of fuel inflow communication passages 24a) is not limited to one. A plurality (here, two) openings 24b may be provided as in the recess 30B shown in FIG. 3B. In this case, the direction in which the openings 24b are lined up may be either the first direction D1 or the second direction D2.
  • the upper part of the partition wall 23 [the upper part in FIG. 2B (that is, the spark plug 18 side)] is formed in a cylindrical shape, and the lower part of the partition wall 23 [the lower part in FIG. 2B (that is, the piston 12 side) goes downward. It is formed in a shape whose diameter is reduced accordingly (here, a substantially hemispherical shape). Further, the partition wall 23 is formed in a rotating body shape centered on the position of the spark discharge portion 18a of the spark plug 18 (that is, the position near the sub chamber central axis CL or the sub chamber central axis CL), except for a part. Has been done. However, the shape of the partition wall 23 is not limited to this.
  • the upper portion preferably has a cylindrical shape centered on the spark discharge portion 18a of the spark plug 18, but the lower portion may have a shape that is continuous with the cylindrical shape of the upper portion and whose diameter decreases as it goes downward and the cross-sectional area gradually decreases. ..
  • each of the communication passages 24 is arranged in a portion (diameter-reduced portion) having a shape in which the cross-sectional area gradually decreases in the lower part of the sub chamber 22.
  • the direction of the auxiliary chamber central axis CL and the direction of the bore central axis do not necessarily have to be the same, and the auxiliary chamber central axis CL may be provided so as to be inclined with respect to the bore central axis.
  • the inner wall surface of the sub chamber 22 (the sub chamber wall surface 22W) has a cylindrical inner wall surface 22W1 and a lower portion (that is, the ignition plug 18 side) formed in a cylindrical shape at the upper portion (that is, the ignition plug 18 side). That is, it is provided with a diameter-reduced inner wall surface 22W2 formed in a shape in which the diameter is reduced toward the bottom on the piston 12 side).
  • Each of the communication passages 24 is formed on the reduced diameter inner wall surface 22W2 at the lower part of the sub chamber 22.
  • the recess 30 is also formed in the reduced diameter inner wall surface 22W2 at the lower part of the sub chamber 22, and as shown in FIG. 4B, the portion where the recess 30 is formed in the inner wall surface of the sub chamber 22 is formed in the sub chamber 22. It is a convex inner wall portion 22W3 formed in a convex shape toward the surface.
  • the fuel inflow passage 24a is in the direction toward the central axis CL of the sub chamber 22 and upward (that is, on the spark plug 18 side) when viewed from the axial direction (direction in which the central axis of the bore extends). ) Is oriented toward. As a result, the fuel introduced from the outside to the inside of the sub chamber 22 tends to approach the spark discharge portion 18a of the spark plug 18.
  • each of the communication passages 24c is oriented in a direction in which the passages 24c are inclined to the left at the same angle in a plan view with respect to the direction toward the center of the sub chamber 22.
  • these communication passages 24c function as swirl flow generation communication passages.
  • the inclination direction of the plurality of swirl flow generation passages 24c may be to the right with respect to the direction of the central axis of the sub chamber 22, and the inclination angles of the swirl flow generation passages 24c do not necessarily have to be the same. good.
  • the fuel inflow communication passage 24a and the swirl flow generation communication passage 24c are any of them. Is also oriented in an inclined direction from one end side [lower piston 12 side in FIG. 2B] to the other end side [upper spark plug 18 side in FIG. 2B] of the sub chamber 22.
  • the extension line of the fuel inflow passage 24a to the sub chamber wall surface 22W is arranged so as to reach the cylindrical inner wall surface (cylindrical inner wall surface) 22W1 in the upper part of the sub chamber 22.
  • the recess 30 is formed on a slope portion deviated from the auxiliary chamber central axis CL in a substantially hemispherical portion (a shape in which the diameter is reduced toward the lower side and the cross-sectional area is gradually reduced) in the lower part of the partition wall 23. Therefore, the lower portion of the partition wall 23 is formed in a substantially hemispherical shape except for the portion where the recess 30 is formed. Further, in the present embodiment, a recess 30 is formed in a part of the lower portion of the partition wall 23 while maintaining a substantially uniform thickness, and the recess 30 is formed on the outer surface of the partition wall 23 and on the inner surface of the partition wall 23. A convex portion 31 corresponding to the concave portion 30 is formed.
  • the recess 30 may have a shape in which the outer surface of the sub chamber 22 (outer surface of the partition wall 23) is cut out.
  • the recess 30 is formed in the outer surface of the partition wall 23 while maintaining a substantially hemispherical shape on the inner surface of the partition wall 23. May be formed. In this case, the thickness of the portion where the recess 30 is formed decreases.
  • the receiving surface 30a is formed at the center of the fuel injection range from the fuel injection valve 17, and the opening 24b is arranged at a position deviated from the center of the fuel injection range from the fuel injection valve 17.
  • the center of the fuel injection range is the face center (center of the front view) of the recess 30 in the front view
  • the opening 24b is arranged at a position deviated from the center of the front view.
  • the center of the fuel injection range is slightly shifted downward in FIG. 2B (that is, the piston 12 side), and the opening 24b is upward (that is, the cylinder head) in FIG. 2B. There is a slight shift to the 3rd side).
  • the direction in which the opening 24b deviates from the center of the fuel injection range is not limited to this.
  • the fuel inflow passage 24a is closer to the axis in the sub chamber 22 (near the sub chamber central axis CL or the sub chamber central axis CL) from the opening 24b toward the inside of the sub chamber 22, and is upward in FIG. 2B. It is inclined toward (that is, the cylinder head 3 side).
  • the fuel inflow direction in the fuel inflow passage 24a is a direction approaching the spark discharge portion 18a of the upper spark plug 18 in the sub chamber 22.
  • fuel is injected from the fuel injection valve 17 into the main chamber 21 at the beginning of the intake stroke [see FIG. 5A], and at the end of the subsequent compression stroke, the fuel injection valve 17 enters the sub chamber 22 via the main chamber 21.
  • Fuel is injected into (see FIG. 5B).
  • port injection port injection is adopted, port injection is performed in the exhaust stroke, and fuel is supplied into the main chamber 21 together with the intake air in the intake stroke.
  • the air-fuel mixture formed in the sub chamber 22 by the spark plug 18 is ignited, and the flame formed in the sub chamber 22 by this ignition is transmitted to the main chamber through the plurality of communication passages 24.
  • a jet is ejected into the main chamber 21 to ignite the air-fuel mixture in the main chamber 21 and burn it [see FIG. 5C].
  • the pressurized air (fuel-lean air-fuel mixture) in the main chamber 21 enters the sub-chamber 22 through the communication passage 24 in the compression stroke. .. Then, the air entering the sub-chamber 22 through the swirl flow generation communication passage 24c generates a swirl flow in the sub-chamber 22 as shown in FIGS. 2A and 2B. As shown in FIGS. 4A and 4B, this swirl flow rises toward the spark plug 18 while developing in the sub-chamber 22.
  • fuel is injected from the fuel injection valve 17 into the sub chamber 22 via the main chamber 21, and is introduced into the sub chamber 22 from the opening 24b via the fuel inflow communication passage 24a.
  • the swirl flow generated in the sub-chamber 22 collects fuel in the vicinity of the spark discharge portion 18a of the spark plug 18 near the center of the swirl because the swirling flow velocity is slow, and the air of the fuel because the swirling flow velocity is fast near the outside of the swirl. Mixing with is promoted.
  • the air-fuel mixture having a high fuel concentration near the spark discharge portion 18a of the spark plug 18 will be ignited, and the ignition will be performed reliably. be able to.
  • a flame can be surely formed in the sub chamber 22, and the flame is jetted into the main chamber 21 through the plurality of passages 24 to ignite and burn the air-fuel mixture in the main chamber 21. be able to.
  • the air-fuel mixture having a high fuel concentration is generated only in the vicinity of the spark discharge portion 18a, it is possible to reduce the amount of direct injection fuel.
  • a convex inner wall surface 22W3 corresponding to the recess 30 is formed on the inner surface of the partition wall 23 (inner wall surface of the sub chamber 22), and the air entering the sub chamber 22 through the swirl flow generation communication passage 24c is convex.
  • a turbulent flow is generated to promote mixing of the fuel with air, and then, while rising, along the cylindrical inner wall surface (cylindrical inner wall surface) in the upper part of the sub chamber 22. It is rectified and develops into a high-speed swirl flow. Therefore, the convex inner wall portion 22W3 corresponding to the concave portion 30 contributes to the uniformization of the equivalent ratio in the sub chamber 22.
  • the fuel (fuel-rich air-fuel mixture) introduced into the sub chamber 22 through the fuel inflow passage 24a is a cylinder close to the spark discharge portion 18a of the spark plug 18 from the reduced diameter inner wall surface 22W2 in the sub chamber 22.
  • the fuel fuel-rich air-fuel mixture
  • the convex inner wall portion 22W3 is formed on the reduced diameter inner wall surface 22W2, so that the air entering the sub chamber 22 is convex as shown in FIG.
  • the fuel injected from the fuel injection valve 17 first collides with the receiving surface 30a of the recess 30. Therefore, the direct-injection fuel is promoted to split and vaporize while staying in the recess 30 and its vicinity, and is introduced into the sub-chamber 22 from the opening 24b via the fuel inflow communication passage 24a.
  • the splitting and vaporization in the recess 30 contributes to the subsequent promotion of mixing with air in the sub chamber 22.
  • the direct-injection fuel is caught in the recess 30 and proceeds from the opening 24b to the fuel inflow passage 24a, so that a part of the fuel injected from the injector 17 does not enter the sub-chamber 22 and the partition wall. Passing along the outer surface of 23 (the wall portion of the sub chamber 22) is suppressed, and reaching the opposite side of the injector 17 to form a rich air-fuel mixture is avoided or suppressed. Therefore, it is possible to avoid or suppress the generation of a large amount of NOx due to the rich air-fuel mixture.
  • the opening 24b of the fuel inflow passage 24a is arranged at the bottom of the recess 30 or near the bottom, the fuel that collides with the receiving surface 30a and is promoted to split or vaporize is along the wall surface of the recess 30. The fuel smoothly flows into the sub chamber 22 from the opening 24b through the fuel inflow passage 24a.
  • the fuel inflow communication passage 24a Since the fuel inflow communication passage 24a is inclined in a direction approaching the spark discharge portion 18a of the spark plug 18, the fuel passing through the fuel inflow communication passage 24a goes toward the spark discharge portion 18a in the upper part of the sub chamber 22 and is directed to the spark discharge portion 18a. A rich fuel mixture is concentrated in the vicinity of 18a. Therefore, the ignition by the spark plug 18 and the flame formed in the sub chamber 22 after that can be strengthened, and a strong jet is ejected into the main chamber 21 through the plurality of communication passages 24 to mix in the main chamber 21. It can ignite the qi and promote combustion.
  • the configuration of the sub-chamber spark ignition engine described above is an example.
  • the arrangement of the sub chamber 22, that is, the partition wall 23 for partitioning the sub chamber 22 is not necessarily limited to the bore central axis of the top 20a of the combustion chamber 20 or the vicinity of the bore central axis, and also the top 20a of the combustion chamber 20. Not limited.
  • only one fuel inflow communication passage 24a is provided, but a plurality of fuel inflow communication passages 24a may be provided in the recess 30.
  • the fuel injection valve 17 may be provided with an injection port for supplying fuel into the main chamber 21 in addition to the injection port for supplying fuel into the sub chamber 22.
  • the recess 30 is formed, but this is not essential, and the shape of the sub chamber 22, that is, the partition wall 23 for partitioning the sub chamber 22, is shown in the fuel inflow chain as shown in FIG. It may have a perfect rotating body shape except for the passage 24a.
  • the recess 30 has a funnel shape using a mortar-shaped or conical surface formed by a smooth curved surface, but the shape of the recess 30 is not limited to this.
  • the opening 24b is arranged at the bottom of the recess 30 or near the bottom, but if the inner surface shape of the recess 30 is a shape that can guide the fuel received by the receiving portion 30a to the opening 24b. , The opening 24b may be arranged at the bottom of the recess 30 or near the bottom.

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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)
PCT/JP2020/025900 2020-02-10 2020-07-01 副室式火花点火エンジン Ceased WO2021161553A1 (ja)

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Cited By (5)

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