KR100287688B1 - Structure of intake port for lean burn engine - Google Patents

Structure of intake port for lean burn engine Download PDF

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Publication number
KR100287688B1
KR100287688B1 KR1019970043566A KR19970043566A KR100287688B1 KR 100287688 B1 KR100287688 B1 KR 100287688B1 KR 1019970043566 A KR1019970043566 A KR 1019970043566A KR 19970043566 A KR19970043566 A KR 19970043566A KR 100287688 B1 KR100287688 B1 KR 100287688B1
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South Korea
Prior art keywords
swirl
port
straight
combustion chamber
intake port
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KR1019970043566A
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Korean (ko)
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KR19990020119A (en
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이원형
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이계안
현대자동차주식회사
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Priority to KR1019970043566A priority Critical patent/KR100287688B1/en
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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
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
    • 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
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/10—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of charging or scavenging apparatus
    • 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
    • F02M29/00—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture
    • F02M29/04—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture having screens, gratings, baffles or the like
    • F02M29/06—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture having screens, gratings, baffles or the like generating whirling motion of mixture
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE: A structure of an intake port for a lean burn engine is provided to prevent an output reduction and to reduce gas mileage by constituting a swirl generating passageway between a swirl port and a straight port as to generate strong eddy flow in rare fuel-air ratio operation. CONSTITUTION: An intake port consists of a swirl port(52) and a straight port(54) which are connected with a combustion chamber(50). A swirl control valve(56) is installed front of the swirl port. An opening and shutting valve(58) is installed back of the straight port. A swirl generating passageway(60) extending from the straight port to the swirl port is installed so that the swirl control valve and the opening and shutting valve are closed in rare fuel-air ratio operation, whereby mixed gas is introduced into the combustion chamber through the swirl generating passageway. The swirl generating passageway slopes towards air flow direction so that mixed gas flows smoothly from the straight port to the swirl port.

Description

린번 엔진의 흡기 포트 구조Intake port structure of the lean burn engine

본 발명은 린번(Lean Burn) 엔진의 흡기 포트 구조에 관한 것으로서, 특히 스월 포트와 직선형 포트 사이에 스월 발생 통로를 형성하여 희박 공연비 운전시에 보다 강한 맴돌이를 생성시킴으로써 전개시에 출력 저하를 방지하고 연비를 저감할 수 있도록 한 린번 엔진의 흡기 포트 구조에 관한 것이다.The present invention relates to an intake port structure of a lean burn engine, and in particular, a swirl generation passage is formed between a swirl port and a straight port to generate a stronger eddy in the lean air-fuel ratio operation, thereby preventing output degradation during deployment. It relates to an intake port structure of a lean burn engine capable of reducing fuel economy.

일반적으로 린번(Lean Burn) 엔진은 하나의 연소실에 2 개의 흡기 포트가 도입되어 엔진의 상태 및 운전 조건에 따라 한 쪽의 흡기 포트를 개폐시키므로써 연료와 공기의 혼합비를 조절하게 되고, 결과적으로 공기와 연료의 혼합비가 22:1 정도의 희박 공연비로도 운전이 가능하게 되어 엔진 성능 및 연비 향상을 도모할 수 있도록 되어 있다.In general, a lean burn engine has two intake ports in one combustion chamber to open and close one intake port according to the engine condition and operating conditions, thereby controlling the fuel and air mixing ratio. It is possible to operate at a lean air-fuel ratio of about 22: 1 with the fuel mixture ratio, so that the engine performance and fuel economy can be improved.

상기한 린번 엔진의 흡기 포트 구조는 도 1에 도시된 바와 같이 흡기 포트가 연소실(10)로 도입되는 과정에서 직선형 포트(14)와 스월 포트(12)로 분리되고, 상기 직선형 포트(14)에는 스월 제어 밸브(16)가 설치되어 있다. 이것은 공연비가 22:1 정도의 희박 공연비 운전 조건에서 상기 스월 제어 밸브(16)를 작동하여 직선형 포트(14)는 닫고 스월 돌기(12a)가 형성된 스월 포트(12)만을 개방한 상태에서 연료와 공기의 혼합기를 연소실(10)에 흡입하고, 이에 따라 동력 행정이 이루어지도록 되어 있다.As shown in FIG. 1, the intake port structure of the lean burn engine is separated into a straight port 14 and a swirl port 12 while the intake port is introduced into the combustion chamber 10. The swirl control valve 16 is provided. This is because fuel and air are operated while the swirl control valve 16 is operated under the lean air-fuel ratio operating condition of the air-fuel ratio of about 22: 1, and the straight port 14 is closed and only the swirl port 12 having the swirl protrusion 12a is opened. Is mixed into the combustion chamber 10, whereby a power stroke is made.

또한, 상기와 다르게 도 2에 도시된 바와 같이 개폐 포트(24)의 안쪽, 즉 연소실(10)의 입구측에 개폐 밸브(28)가 설치되어 희박 공연비 운전시에는 상기 개폐 포트(24)의 개폐 밸브(28)는 닫고 스월 포트(22)만 개방시킨 상태에서 혼합기를 흡입하게 된다.In addition, unlike the above, as shown in FIG. 2, an opening / closing valve 28 is installed inside the opening / closing port 24, that is, at the inlet side of the combustion chamber 10, so that the opening / closing port 24 is opened or closed during lean air-fuel ratio operation. The valve 28 is closed and the mixer is sucked in with only the swirl pot 22 opened.

그러나, 상기한 바와 같은 종래 린번 엔진의 흡기 포트 구조에서 도 1에 도시된 바와 같은 흡기 포트는 희박 연소시에 스월 제어 밸브(16)가 직선형 포트(14)를 닫아 스월 포트(12)로만 혼합기가 유동되면서 스월 돌기(12a)에 의해 맴돌이가 형성되기 때문에 전개(full load) 운전시 흡입 공기량이 떨어져 엔진의 출력이 저하되는 문제점이 있다.However, in the intake port structure of the conventional lean burn engine as described above, the intake port as shown in Fig. 1 has a swirl control valve 16 closes the straight port 14 during the lean burn so that the mixer only has the swirl port 12. Since the eddy is formed by the swirl protrusion 12a while flowing, there is a problem that the output of the engine is lowered when the intake air amount drops during the full load operation.

또한, 도 2에 도시된 바와 같은 흡기 포트는 희박 연소시 개폐 포트(24)의 개폐 밸브(28)는 닫히고 스월 포트(22)로만 혼합기가 흡입되어 연소실(10) 내에서 맴돌이 현상이 발생되나 이때에는 약한 맴돌이만 생성되어 연소 효율이 떨어지는 문제점이 있다.In addition, in the intake port as shown in FIG. 2, when the lean combustion, the opening / closing valve 28 of the opening / closing port 24 is closed and the mixer is sucked only into the swirl port 22, thereby causing a circulating phenomenon in the combustion chamber 10. There is a problem in that the combustion efficiency is lowered because only weak eddy is generated.

본 발명은 상기한 문제점을 해결하기 위해 안출된 것으로서, 직선형 포트에서 스월 포트로 통하는 스월 발생 통로를 형성하여 희박 운전시 강한 맴돌이를 생성시킴으로써 희박 운전에 의해 연비를 저감할 수 있고 풀로드시 출력 저하를 방지할 수 있도록 한 린번 엔진의 흡기 포트 구조를 제공하는 데 있다.The present invention has been made to solve the above problems, by forming a swirl generating passage from the straight port to the swirl pot to create a strong eddy in lean operation to reduce fuel economy by lean operation and output reduction at full load It is to provide an intake port structure of the lean burn engine to prevent the.

도 1과는 도 2는 종래 린번 엔진의 흡기 포트 구조가 도시된 개략적인 단면도,1 and 2 is a schematic cross-sectional view showing the intake port structure of a conventional lean burn engine,

도 3은 본 발명에 따른 린번 엔진의 흡기 포트 구조가 도시된 단면도이다.　3 is a cross-sectional view showing an intake port structure of a lean burn engine according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

50 : 연소실 52 : 스월 포트50: combustion chamber 52: swirl pot

54 : 직선형 포트 56 : 스월 제어 밸브54: straight port 56: swirl control valve

58 : 개폐 밸브 60 : 스월 발생 통로58: opening and closing valve 60: swirl generating passage

상기한 과제를 실현하기 위한 본 발명의 린번 엔진의 흡기 포트 구조는, 흡기 포트가 스월 포트와 직선형 포트로 분리되어 연소실에 연결되고, 상기 스월 포트의 전방에는 스월 제어 밸브가 설치되며, 상기 직선형 포트의 후방에는 개폐 밸브가 설치되며, 상기 직선형 포트에서 스월 포트쪽으로 관통되는 스월 발생 통로가 형성되어; 희박 공연비 운전시에는 상기 스월 제어 밸브 및 개폐 밸브를 닫아 상기 스월 발생 통로를 통해 혼합기가 연소실에 유입되도록 이루어지고; 상기 스월 발생통로는 상기 직선형 포트에서 스월 포트 방향으로 혼합기의 유동이 원활토록 공기 흐름 방향으로 경사지게 형성된 것을 특징으로 한다.In the intake port structure of the lean burn engine of the present invention for realizing the above object, the intake port is separated into a swirl port and a straight port connected to the combustion chamber, a swirl control valve is installed in front of the swirl port, the straight port An opening / closing valve is installed at a rear side of the swirl port, and a swirl generation passage penetrating from the straight port toward the swirl port is formed; During the lean air-fuel ratio operation, the swirl control valve and the closing valve are closed to allow a mixer to flow into the combustion chamber through the swirl generation passage; The swirl generation passage is characterized in that the flow of the mixer in the direction of the swirl pot from the straight port is inclined in the air flow direction so as to smoothly.

이하, 첨부된 도면을 참조하여 본 발명의 실시 예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

본 발명에 의한 린번 엔진의 흡기 포트 구조는 도 3에 도시된 바와 같이 흡기 포트가 분기되어 연소실(50)에 도입되는 스월 포트(52) 및 직선형 포트(54)와, 상기 스월 포트(52)의 전방에 설치된 스월 제어 밸브(56)와, 상기 직선형 포트(54)의 후방에 설치된 개폐 밸브(58)와, 상기 직선형 포트(54)의 중간에서 스월 포트(52)쪽으로 관통되는 스월 발생 통로(60)로 구성되어 있다.As shown in FIG. 3, the intake port structure of the lean burn engine according to the present invention includes a swirl port 52 and a straight port 54 into which the intake port is branched and introduced into the combustion chamber 50. The swirl control valve 56 provided in the front, the opening / closing valve 58 provided in the back of the said linear port 54, and the swirl generation | passage passage 60 which penetrates toward the swirl port 52 in the middle of the said linear port 54. It consists of).

여기서, 상기 스월 발생 통로(60)는 상기 직선형 포트(54)에서 스월 포트(52) 방향으로 혼합기 유동이 원활토록 혼합기 흐름 방향으로 경사지게 형성되는 것이 바람직하다.Here, the swirl generation passage 60 is preferably formed to be inclined in the mixer flow direction so that the mixer flow in the direction of the swirl port 52 in the straight port 54.

상기와 같은 구성되는 본 발명에 따른 린번 엔진의 흡기 포트 구조의 작용을 설명하면 다음과 같다.Referring to the operation of the intake port structure of the lean burn engine according to the present invention constituted as described above are as follows.

희박 공연비 운전시에는 상기 스월 제어 밸브(56) 및 개폐 밸브(58)를 닫아 상기 스월 발생 통로(60)를 통해 혼합기가 연소실(50)에 유입되도록 이루어 진다.In the lean air-fuel ratio operation, the swirl control valve 56 and the opening / closing valve 58 are closed to allow the mixer to flow into the combustion chamber 50 through the swirl generation passage 60.

즉, 스월 포트(52)의 전방에 위치된 스월 제어 밸브(56)가 닫혀있기 때문에 스월 포트(52)로는 곧바로 혼합기가 유입되지 않게 되고, 직선형 포트(54)의 후방에 위치된 개폐 밸브(58)도 닫혀있기 때문에 직선형 포트(54)를 통해서도 연소실(50)에 혼합기가 유입되지 않게 된다. 그러나, 연소실의 흡기 부압에 의해 상기 직선형 포트(54)로 유입되는 혼합기는 스월 발생 통로(60)를 통해 스월 포트(52)쪽으로 유동되면서 연소실(50)로 흡입되게 된다.That is, since the swirl control valve 56 located in front of the swirl pot 52 is closed, the mixer does not flow directly into the swirl pot 52, and the opening / closing valve 58 located behind the straight port 54 is provided. ) Is also closed, so that the mixer does not flow into the combustion chamber 50 even through the straight port 54. However, the mixer introduced into the straight port 54 by the intake negative pressure of the combustion chamber is sucked into the combustion chamber 50 while flowing toward the swirl port 52 through the swirl generation passage 60.

따라서, 상기 직선형 포트(52)로 유입되는 혼합기는 스월 발생 통로(60)의 경사면과 스월 포트(52)의 경사면과 스월 포트(52)의 유선형 구조에 의해 연소실(50)로 유입되면서 강한 맴돌이를 생성하기 때문에 연소실(50) 내의 성층화 현상을 촉진하여 희박 공연비 조건에서도 연소 효율이 상승된다.Therefore, the mixer flowing into the straight pot 52 is introduced into the combustion chamber 50 by the inclined surface of the swirl generating passage 60, the inclined surface of the swirl pot 52, and the streamlined structure of the swirl pot 52, and thus has a strong eddy. Since it produces | generates, the stratification phenomenon in the combustion chamber 50 is accelerated | stimulated and combustion efficiency improves even in lean air fuel ratio conditions.

한편, 이론 공연비 운전시에는 상기 스월 포트(52) 및 직선형 포트(54)의 스월 제어 밸브(56)와 개폐 밸브(58)를 개방시킨 상태에서 연소실(50)에 혼합기를 흡입하면 된다.On the other hand, in the theoretical air-fuel ratio operation, the mixer may be sucked into the combustion chamber 50 while the swirl control valve 56 and the open / close valve 58 of the swirl pot 52 and the straight port 54 are opened.

상기와 같이 구성되고 작용하는 본 발명에 의한 린번 엔진의 흡기 포트 구조는 희박 공연비 운전시 스월 발생 통로(60)를 통해 직선형 포트(54)에서 스월 포트(52)로만 혼합기가 유동되어 연소실(50) 내에서 강한 맴돌이가 형성되기 때문에 연소 효율이 향상되어 연비가 저감됨은 물론 유해 배기 가스가 저감되고 린번 엔진의 단점인 전개시 출력 저하가 방지되는 이점이 있다.In the intake port structure of the lean burn engine according to the present invention configured and acting as described above, the mixer is only flowed from the straight port 54 to the swirl pot 52 through the swirl generating passage 60 during the lean air-fuel ratio operation, and thus the combustion chamber 50 is operated. Since the strong eddy is formed in the combustion efficiency is improved to reduce the fuel economy as well as to reduce the harmful exhaust gas has the advantage of preventing the power output during deployment, which is a disadvantage of the lean burn engine.

Claims (1)

흡기 포트가 스월 포트와 직선형 포트로 분리되어 연소실에 연결되고, 상기 스월 포트의 전방에는 스월 제어 밸브가 설치되며, 상기 직선형 포트의 후방에는 개폐 밸브가 설치되며, 상기 직선형 포트에서 스월 포트쪽으로 관통되는 스월 발생 통로가 형성되어; 희박 공연비 운전시에는 상기 스월 제어 밸브 및 개폐 밸브를 닫아 상기 스월 발생 통로를 통해 혼합기가 연소실에 유입되도록 이루어지고;The intake port is divided into a swirl port and a straight port and connected to the combustion chamber, a swirl control valve is installed in front of the swirl port, and an opening and closing valve is installed at the rear of the straight port and penetrates from the straight port toward the swirl port. A swirl generation passage is formed; During the lean air-fuel ratio operation, the swirl control valve and the closing valve are closed to allow a mixer to flow into the combustion chamber through the swirl generation passage; 상기 스월 발생 통로는 상기 직선형 포트에서 스월 포트 방향으로 혼합기의 유동이 원활토록 공기 흐름 방향으로 경사지게 형성된 것을 특징으로 하는 린번 엔진의 흡기 포트 구조.The swirl generation passage is an intake port structure of a lean burn engine, characterized in that the inclined in the air flow direction so that the flow of the mixer from the straight port to the swirl port smoothly.
KR1019970043566A 1997-08-30 1997-08-30 Structure of intake port for lean burn engine KR100287688B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848712A (en) * 1981-09-02 1983-03-22 Toyota Motor Corp Air inlet device of internal-combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848712A (en) * 1981-09-02 1983-03-22 Toyota Motor Corp Air inlet device of internal-combustion engine

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