WO2024201932A1 - 副燃焼室付内燃機関 - Google Patents

副燃焼室付内燃機関 Download PDF

Info

Publication number
WO2024201932A1
WO2024201932A1 PCT/JP2023/013306 JP2023013306W WO2024201932A1 WO 2024201932 A1 WO2024201932 A1 WO 2024201932A1 JP 2023013306 W JP2023013306 W JP 2023013306W WO 2024201932 A1 WO2024201932 A1 WO 2024201932A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion chamber
communication passage
main combustion
partition wall
auxiliary
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/JP2023/013306
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
敏之 山田
欣也 井上
伸治 林
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/JP2023/013306 priority Critical patent/WO2024201932A1/ja
Priority to JP2025509526A priority patent/JPWO2024201932A1/ja
Publication of WO2024201932A1 publication Critical patent/WO2024201932A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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.
  • Many internal combustion engines such as gasoline engines used in automobiles, have an injector (fuel injection device) that injects fuel into the intake passage or combustion chamber, and an ignition device (spark plug) that is positioned facing the combustion chamber inside the cylinder.
  • injector fuel injection device
  • ignition device spark plug
  • Patent Document 1 further discloses an internal combustion engine equipped with a secondary combustion chamber within the combustion chamber (main combustion chamber).
  • a mixture with a relatively high fuel concentration is supplied to the secondary combustion chamber, and an ignition device is used to ignite the mixture in the secondary combustion chamber, 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 is equipped with multiple nozzle holes that inject flames from the auxiliary combustion chamber to promote combustion in the main combustion chamber, and is configured so that the flames are injected radially toward the cylinder wall surface.
  • the present invention has been made to solve these problems, and aims to provide an internal combustion engine with a pre-chamber that efficiently introduces fuel into the pre-chamber and promotes combustion in the main combustion chamber by the flame injected from the pre-chamber.
  • the internal combustion engine with an auxiliary combustion chamber of the present invention is an internal combustion engine with an auxiliary combustion chamber, which 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 injects fuel into the main combustion chamber, an ignition device that ignites in the auxiliary combustion chamber, and a plurality of communication passages provided in the partition wall that connect the auxiliary combustion chamber to the main combustion chamber and are arranged side by side in the circumferential direction of the partition wall, the communication passages have a first communication passage located in the injection area of the fuel injection device and a plurality of second communication passages other than the first communication passages, and are formed to extend toward the central axis of the auxiliary combustion chamber, the opening of the first communication passage on the main combustion chamber side is circular, and the opening of the second communication passage on the main combustion chamber side is formed such that the width on the circumferential
  • the flame is sprayed widely into the main combustion chamber through multiple second communication passages that are arranged in a line around the circumferential direction of the partition wall and have long hole-shaped openings on the main combustion chamber side, increasing the surface area of the flame within the main combustion chamber and promoting combustion.
  • the opening of the first communication passage on the main combustion chamber side is circular, even if the fuel injected from the fuel injection device moves in the axial direction of the cylinder block relative to the opening of the first communication passage due to, for example, changes in the intake tumble flow in the main combustion chamber, the fuel can still flow efficiently into the first communication passage, improving combustibility in the auxiliary combustion chamber.
  • the opening areas of all the first communication passages and the second communication passages on the main combustion chamber side are the same. This allows the same amount of flame to be injected into the main combustion chamber from each of the second communication passages and the first communication passage, so that the air-fuel mixture can be combusted approximately evenly around the auxiliary combustion chamber in the main combustion chamber.
  • the fuel injection device is disposed on the intake side of the cylinder head, and the first communication passage is disposed at a portion of the intake side of the partition wall. This allows the fuel injected from the fuel injection device toward the first communication passage to reach the first communication passage efficiently along the flow of intake air flowing from the intake side to the exhaust side at the top of the main combustion chamber.
  • the second communication passages are formed such that their lengths in the circumferential direction increase as their installation positions in the partition wall approach the intake side or the exhaust side.
  • a flame is injected with a long circumferential width toward the intake side or exhaust side where fuel is likely to stagnate due to tumble flow, and a flame is injected with a short circumferential width between the intake side and exhaust side. This allows fuel to be injected far away without being obstructed by the cylinder head, and improves combustibility over a wide area around the auxiliary combustion chamber.
  • all of the communication passages have the same inclination angle with respect to a direction perpendicular to a central axis of the cylinder block, and extend toward the same position on the central axis of the partition wall. This allows the flame generated by ignition in the auxiliary combustion chamber to be sprayed evenly radially from the first communication passage and the first communication passage into the main combustion chamber, improving combustibility in the main combustion chamber.
  • the fuel injected from the fuel injection device can be efficiently introduced into the auxiliary combustion chamber mainly through the first communication passage, increasing the fuel concentration in the auxiliary combustion chamber and improving combustibility. Therefore, when ignition occurs in the auxiliary combustion chamber, a strong flame can be ejected from the auxiliary combustion chamber.
  • the flame generated in the auxiliary combustion chamber can be injected so as to spread around the partition wall through the first and second communication passages, and in particular, the flame can be injected from the second communication passage so as to spread widely, thereby improving the combustibility in the main combustion chamber. This can improve the output of the internal combustion engine, or reduce fuel consumption by reducing the amount of fuel injected.
  • 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
  • 1 is a top view of a cylinder in an internal combustion engine according to an embodiment of the present invention.
  • FIG. FIG. FIG. 4 is a side view seen from the intake side showing the shape of the partition wall.
  • FIG. 4 is a vertical cross-sectional view showing a detailed shape of a partition wall.
  • 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 of the inside of a cylinder, showing a state in which flame is injected from an auxiliary combustion chamber.
  • 13 is an explanatory diagram showing the shape of a communication passage of a partition wall according to another embodiment.
  • 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 communicates the exhaust passage 11 and the intake passage 5 of the internal combustion engine 1, an EGR valve 21 that changes the flow path 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 to the intake passage 5 between the air cleaner 6 and the compressor of the turbocharger 15.
  • Figure 2 is a top view of the inside of the cylinder 30 in the internal combustion engine 1 of this embodiment.
  • Figure 3 is a front view showing the structure of the partition wall 42 that forms the auxiliary combustion chamber 43 inside.
  • Figure 4 is a side view of the partition wall 42 as seen from the intake side.
  • 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 upper portion (cylinder head 34) of a cylinder 30 of the internal combustion engine 1 two intake ports 2 are arranged side by side on one side with the center portion in between, and two exhaust ports 31 are arranged side by side on the other side.
  • 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 upper center of the combustion chamber, more specifically, 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.
  • the bottom surface of the cylinder head 34 facing the main combustion chamber 41 is pent roof shaped, inclined downward (towards the piston 37) from the center in the intake/exhaust direction toward the intake side and the exhaust side.
  • a main combustion chamber 41 which is a substantially cylindrical space surrounded by the cylinder block 36, the cylinder head 34, and the piston 37, and furthermore, a sub-combustion chamber 43 is provided in the upper center of the main combustion chamber 41.
  • the cylinder head 34 is provided with a partition wall 42 that surrounds the center electrode of the ignition plug 35, and the part of the main combustion chamber 41 surrounded by the partition wall 42 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 also substantially hemispherical and protrudes downward (towards the piston 37), and the cross section taken along a plane perpendicular to the moving direction of the piston 37 is substantially cylindrical.
  • the partition wall 42 is provided with a plurality of communication passages 44a, 44b, and the main combustion chamber 41 and the sub-combustion chamber 43 are connected via the communication passages 44a, 44b.
  • 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.
  • each communication passage 44a, 44b is arranged at approximately equal intervals in the circumferential direction of the partition wall .
  • the communication passages 44a, 44b are provided near the radially outermost portion of the partition wall 42 in a cross section taken along a plane perpendicular to the direction of movement of the piston 37 (near the upper end of the approximately hemispherical portion protruding downward).
  • the first communication passage 44a which is located directly opposite the fuel injection port 3a of the injector 3, has a circular opening on the main combustion chamber 41 side.
  • the fuel injected from the injector 3 is injected toward the first communication passage 44a, and most of the fuel flows into the communication passage 44a due to the penetration force of the fuel injection.
  • the first communication passage 44a is located in the injection area of the fuel injected from the injector 3.
  • the seven second communication passages 44b other than the first communication passage 44a are long holes that are long in the circumferential direction of the partition wall 42.
  • the major axis of the second communication passage 44b is longer than the diameter of the first communication passage 44a, and the minor axis (diameter in the vertical direction) of the second communication passage 44b is shorter than the diameter of the first communication passage 44a.
  • the opening area of the first communication passage 44a on the main combustion chamber 41 side and the opening area of each of the second communication passages 44b on the main combustion chamber 41 side are set to be the same.
  • the first communication passage 44a and the second communication passage 44b extend at an angle to a plane perpendicular to the axis CL of the partition wall 42 (the axis of the cylinder block 36), and are inclined upward (toward the ignition plug 35) from the main combustion chamber 41 toward the auxiliary combustion chamber 43.
  • the axes of all of the communication passages 44a, 44b are set to intersect at the same intersection point P1 on the axis CL of the partition wall 42.
  • the partition wall 42 is located at the center of the cylinder block 36, and the intersection point P1 of the axes of the first communication passage 44a and the second communication passage 44b is located on the central axis of the cylinder block 36.
  • 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 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. After that, another injection is performed 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 periphery of the partition wall 42 flows into the auxiliary combustion chamber 43 from the communication passages 44a, 44b.
  • 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 in the same way as the initially injected fuel. Note that a tumble flow occurs in the main combustion chamber 41, in which the intake air swirls vertically.
  • the ignition plug 35 ignites the air-fuel mixture in the auxiliary combustion chamber 43.
  • the flame generated by ignition in the auxiliary combustion chamber 43 passes through the communication passages 44a and 44b and is injected into the main combustion chamber 41, combusting the air-fuel mixture in the main combustion chamber 41.
  • the communication passages 44a, 44b are arranged at approximately equal intervals in the circumferential direction on the partition wall 42 of the auxiliary combustion chamber 43, which is located approximately in the center of the main combustion chamber 41, so that flames are sprayed from the auxiliary combustion chamber 43 radially outwardly of the main combustion chamber 41, all around the circumference.
  • the second communication passage 44b is a long hole extending in the circumferential direction of the partition wall 42, so that the flame injected from the second communication passage 44b is injected so as to spread in the circumferential direction from near the center of the main combustion chamber 41. Therefore, the surface area of the flame injected from the second communication passage 44b can be increased, and combustion in the main combustion chamber 41 can be promoted.
  • the fuel injected from the injector 3 toward the first communication passage 44a may be affected by the tumble flow in the main combustion chamber 41 and may reach a different position in the axial direction of the cylinder block 36 (axial direction of the cylinder 30: vertical direction) relative to the first communication passage 44a.
  • the opening of the first communication passage 44a directly facing the fuel injection port 3a of the injector 3 is circular, even if the fuel injected from the injector 3 moves in the vertical and horizontal directions in the main combustion chamber 41 due to the influence of the tumble flow, it is easy for it to flow into the first communication passage 44a.
  • the opening area of the first communication passage 44a arranged in the circumferential direction of the partition wall 42 is set to be the same as the opening area of each of the second communication passages 44b, so that the same amount of flame can be injected from each communication passage 44a, 44b from the auxiliary combustion chamber 43 to the main combustion chamber 41. Therefore, the air-fuel mixture can be burned approximately evenly and efficiently around the auxiliary combustion chamber 43 in the main combustion chamber 41.
  • the injector 3 is disposed on the intake side (intake valve 32 side) of the cylinder head 34, the fuel injected from the injector 3 toward the first communication passage 44a can efficiently reach the first communication passage 44a along the tumble flow of intake air that flows from the intake side to the exhaust side at the top of the main combustion chamber 41.
  • all of the communication passages 44a, 44b have the same inclination angle with respect to the central axis CL of the partition wall 42, i.e., the perpendicular direction to the central axis of the cylinder block 36, and extend toward the intersection point P1 at the same position on the central axis CL. Therefore, the flame generated by ignition in the auxiliary combustion chamber 43 can be sprayed radially from the first communication passage 44a and the second communication passage 44b into the main combustion chamber 41 at the same angle, improving the combustibility in the main combustion chamber 41.
  • the circumferential lengths of the multiple second communication passages 44b provided in the partition wall 42 may be different depending on the installation position. As shown in Fig. 8, the circumferential lengths of the second communication passages 44b (indicated by dashed arrows in Fig. 8) may be shorter for the second communication passages 44b located on the lateral sides in the intake/exhaust direction, and longer as they approach the intake side or the exhaust side.
  • Fig. 8 shows a cross-sectional view of the partition wall 42 and the shape of each second communication passage 44b as viewed from the front.
  • a flame is injected with a long circumferential width toward the intake side or exhaust side where fuel is likely to stagnate due to tumble flow, improving combustibility, and a flame is injected with a short circumferential width between the intake side and exhaust side, allowing fuel to be injected far outward in the circumferential direction without being obstructed by the wall surface of the pent roof type cylinder head 34, improving combustibility over a wide area around the auxiliary combustion chamber 43.
  • first communication passages 44a and second communication passages 44b are provided in the partition wall 42 and aligned in the circumferential direction, but the number may be more than eight or may be any other number.
  • the positions and detailed shapes of the communication passages 44a, 44b may be changed as appropriate.
  • the shape of the opening of the second communication passage 44b on the main combustion chamber 41 side may be a rectangle, a pentagon, a triangle, or the like that is elongated in the circumferential direction of the partition wall 42.
  • the present invention may also be applied to an internal combustion engine in which the central axis CL of the partition wall 42 is inclined relative to the central axis of the cylinder block 36.
  • one cylinder is provided with two intake valves 32 and two exhaust valves 33, but the present invention can also be applied to internal combustion engines with other numbers, such as one intake valve 32 and one exhaust valve 33.
  • the internal combustion engine of the present invention can also be applied to various internal combustion engines for driving automobiles, etc.
  • the injector 3 that supplies fuel to the auxiliary combustion chamber 43 is used as a means for supplying fuel to the main combustion chamber 41, but a separate injector may be provided, and the injector may be installed not only inside the cylinder but also in the intake port.

Landscapes

  • 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/JP2023/013306 2023-03-30 2023-03-30 副燃焼室付内燃機関 Ceased WO2024201932A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2023/013306 WO2024201932A1 (ja) 2023-03-30 2023-03-30 副燃焼室付内燃機関
JP2025509526A JPWO2024201932A1 (https=) 2023-03-30 2023-03-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/013306 WO2024201932A1 (ja) 2023-03-30 2023-03-30 副燃焼室付内燃機関

Publications (1)

Publication Number Publication Date
WO2024201932A1 true WO2024201932A1 (ja) 2024-10-03

Family

ID=92904454

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/013306 Ceased WO2024201932A1 (ja) 2023-03-30 2023-03-30 副燃焼室付内燃機関

Country Status (2)

Country Link
JP (1) JPWO2024201932A1 (https=)
WO (1) WO2024201932A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007247420A (ja) * 2006-03-13 2007-09-27 Nissan Motor Co Ltd 副室式内燃機関
JP2019031961A (ja) * 2017-08-09 2019-02-28 トヨタ自動車株式会社 内燃機関
WO2020196685A1 (ja) * 2019-03-27 2020-10-01 三菱自動車工業株式会社 副室式内燃機関

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007247420A (ja) * 2006-03-13 2007-09-27 Nissan Motor Co Ltd 副室式内燃機関
JP2019031961A (ja) * 2017-08-09 2019-02-28 トヨタ自動車株式会社 内燃機関
WO2020196685A1 (ja) * 2019-03-27 2020-10-01 三菱自動車工業株式会社 副室式内燃機関

Also Published As

Publication number Publication date
JPWO2024201932A1 (https=) 2024-10-03

Similar Documents

Publication Publication Date Title
US7814883B2 (en) Internal combustion engine with auxiliary combustion chamber
CN1262757C (zh) 燃料喷射系统
US4852525A (en) Combustion chamber in internal combustion engine
JPH0323314A (ja) 成層燃焼型内燃エンジン
JP4501832B2 (ja) 火花点火式直噴エンジン
US6935302B2 (en) In-cylinder injection type internal combustion engine
JP2001227344A (ja) トーチ点火式ガスエンジンの噴孔構造
JP7673220B2 (ja) 点火プラグとプレチャンバ点火プラグとを有する内燃機関
JP2019120131A (ja) 内燃機関の制御装置
CN114233465B (zh) 氨燃料燃烧系统、发动机及燃烧控制方法
WO2020196210A1 (ja) 副室式内燃機関
US4111161A (en) Engine operated on hydrogen-supplemented fuel
JP2004308449A (ja) ディーゼルエンジン
WO2024201932A1 (ja) 副燃焼室付内燃機関
CN114233464B (zh) 燃烧系统、发动机及燃烧控制方法
JP2007138780A (ja) 副室式内燃機関
WO2024201933A1 (ja) 副燃焼室付内燃機関
WO2020196683A1 (ja) 副室式内燃機関
WO2024201935A1 (ja) 副燃焼室付内燃機関
JP7846458B2 (ja) 内燃機関
WO2021161552A1 (ja) 副室式エンジン
JP4682885B2 (ja) 筒内直接噴射式内燃機関
WO2024201934A1 (ja) 副燃焼室付内燃機関
JPH11182249A (ja) 直噴火花点火式内燃機関
JP7643293B2 (ja) 内燃機関用のスパークプラグ及びこれを備えた内燃機関

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23930569

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2025509526

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025509526

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 23930569

Country of ref document: EP

Kind code of ref document: A1