KR0184165B1 - Gasoline engine for a car having a squash piston - Google Patents

Gasoline engine for a car having a squash piston Download PDF

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Publication number
KR0184165B1
KR0184165B1 KR1019960015869A KR19960015869A KR0184165B1 KR 0184165 B1 KR0184165 B1 KR 0184165B1 KR 1019960015869 A KR1019960015869 A KR 1019960015869A KR 19960015869 A KR19960015869 A KR 19960015869A KR 0184165 B1 KR0184165 B1 KR 0184165B1
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South Korea
Prior art keywords
fuel
engine
piston
combustion chamber
injector
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KR1019960015869A
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Korean (ko)
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KR970075261A (en
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이용균
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김영귀
기아자동차주식회사
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Priority to KR1019960015869A priority Critical patent/KR0184165B1/en
Publication of KR970075261A publication Critical patent/KR970075261A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/28Other pistons with specially-shaped head
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/40Squish effect

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

본 발명은 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진에 관한 것으로, 엔진이 이론공연비로 운전할 때 연료의 분사가 연소실(7)내에 장착될 인젝터(8)에 의해이루어져 분산된 연료의 기화시 연소실(7)이 냉각되어 흡입공기의 충진효율이 향상되면서 연소온도 또한 저하되어 노킹발생이 억제되며, 압축비가 증가되어 엔진출력이 10%이상 향상되는 한편, 연소실(7)내의 연료가 직접 분사되어 냉간시동시 이론공연비로의 운전이 가능하면서 이에 따라 일산화탄소의 발생이 저감되면서 가/감속운전시 연료가 포트벽에 접촉되지 않으므로 정밀한 공연비제어가 가능하여 탄화수소배출이 저감되고, 인젝터(8)로부터 분사된 연료는 연소실(7)내에서 전부 연소되어 출력으로 전환되므로 엔진의 응답성이 향상되어 운전성이 개선될 수 있도록 한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct gasoline engine for automobiles having a squash piston, wherein when the engine is operated at theoretical performance ratios, the injection of fuel is carried out by the injector 8 to be mounted in the combustion chamber 7 to vaporize fuel dispersed therein ( 7) Cooling improves the filling efficiency of the intake air, lowers the combustion temperature, suppresses knocking, increases the compression ratio, improves the engine output by more than 10%, and directly cools the fuel in the combustion chamber 7 by cold starting. It is possible to operate at the theoretical theoretical fuel ratio, and accordingly the generation of carbon monoxide is reduced, and the fuel is not in contact with the port wall during acceleration / deceleration operation, so precise air-fuel ratio control is possible, thereby reducing hydrocarbon emissions, and fuel injected from the injector 8. Since the combustion is all in the combustion chamber 7 is converted to the output is to improve the response of the engine to improve the operability.

Description

스쿼시피스톤을 갖는 자동차용 직분식 가솔린 엔진Automotive direct gasoline engine with squash piston

제1a, b, c는 본 발명에 따라 스쿼시피스톤을 갖는 직분식 가솔린엔진의 개략적이 단면도와 이의 측단면도 및 평면도.1a, b, c are schematic cross-sectional views and side sectional and plan views thereof of a direct gasoline engine having a squash piston in accordance with the present invention;

제2a, b는 본 발명의 직분식 가솔린엔진에서 연료의 분사상태를 저부하시와 고부하시로 개략적인 각기 도시한 단면상태도,2a and b are cross-sectional state diagrams schematically showing the injection state of the fuel in the direct gasoline engine of the present invention at low and high loads,

제3도는 엔진부하와 회전수에 따른 각각의 연료분사를 나타낸 그래프.3 is a graph showing fuel injection for each engine load and rotational speed.

제4도는 엔진부하와 회전수를 고려한 공연비를 나타낸 그래프.4 is a graph showing the air-fuel ratio in consideration of the engine load and the number of revolutions.

제5도는 연료분사시기에 따른 연료와 피스톤과의 접촉되는 구간을 나타낸그래프.5 is a graph showing a section in which the fuel and the piston in contact with the fuel injection timing.

제6도는 희박연소시 펌핑손실을 나타낸 그래프.6 is a graph showing the pumping loss in lean burn.

제7도는 종래의 가솔린엔진의 개략적인 단면도이다.7 is a schematic cross-sectional view of a conventional gasoline engine.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 흡기밸브 2 : 배기밸브1: intake valve 2: exhaust valve

3 : 점화플러그 4 : 실린더헤드3: spark plug 4: cylinder head

5 : 실린더 6 : 피스톤5: cylinder 6: piston

6a : 오목부 6b : 돌출부6a: recess 6b: protrusion

7 : 연소실 8 : 인젝터7: combustion chamber 8: injector

[산업상의 이용분야][Industrial use]

본 발명은 스쿼시스피스톤을 갖는 자동차용 직분식 가솔린엔진에 관한 것으로, 특히 엔진의 저부하시에는 희박연소에 의한 연비를 향상시키면서 고부하시에는 이론공연비로의 운전이 실시되게 하여 기관의 출력향상 및 배기가 스저감의 효과를 얻을 수 있도록 된 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct gasoline engine for automobiles having a squash piston, in particular, to improve fuel efficiency due to lean combustion at low load of the engine, and to operate at theoretical performance ratio at high load, thereby improving engine output and exhausting. The present invention relates to a direct gasoline engine for automobiles having squash pistons that can achieve the effect of reducing gas.

[종래의 기술 및 문제점]Conventional Technology and Issues

일반적으로 자동차의 가솔린엔진에서는 제7도에 도시된 바와 같이, 연소실(11)내부로 연료를 공급시켜 주는 인젝터(12)가 흡기매니폴드(13)의 흡기포트(14)쪽에 장착되어, 인젝터(12)를 통한 연료의 분사가 흡기행정중 흡기밸브(15)가 닫힌상태에서 이루어져 흡기포트(14)내부로 연료가 분사되어 유입되고, 이 흡기포트(14)내에 분사된 연료는 다음번 흡기행정중 흡기밸브(15)가 개방되면서 연소실(11)로 유입되어 압축행정을 거쳐 압축된 다음 점화플러그(16)의 점화후 연소되어진다.In general, in the gasoline engine of an automobile, an injector 12 for supplying fuel into the combustion chamber 11 is mounted on the intake port 14 side of the intake manifold 13, as shown in FIG. 12) Injection of fuel through the intake stroke is performed while the intake valve 15 is closed, and fuel is injected into the intake port 14, and the fuel injected into the intake port 14 is in the next intake stroke. As the intake valve 15 is opened, it is introduced into the combustion chamber 11, compressed through a compression stroke, and then burned after ignition of the spark plug 16.

그런데, 이러한 종래의 가솔린엔진에는 흡기포트(14)내부로 분사된 연료가 흡기포트(14) 내벽에 붙어 원하는 만큼의 연료가 유입되지 못할 뿐만 아니라, 흡기행정후 흡기밸브(15)가 닫힌 다음 분사된 연료가 다음번 흡기행정이 시작될 때서야 비로서 연소실(11)내로 유입됨으로 연료의 유입이 지연되는 현상(Time Delay)이 발생되었고, 이론공연비로 운전될 경우의 공회전과 같은 초기운전시에는 흡기공기가 드로틀밸브의 폐쇄로 인해 연소실(11)내로의 유입이 차단되어 연소실(11)내에서는 부압이 발행되므로 피스톤(17)의 하향운동에서 피스톤(17)과 실린더(18)내벽사이의 저항이 생기므로 엔진효율이 대략 30%정도 떨어지는 단점이 있었다.However, in the conventional gasoline engine, the fuel injected into the intake port 14 adheres to the inner wall of the intake port 14, and thus, the desired amount of fuel cannot be introduced, and the intake valve 15 is closed after the intake stroke. When the spent fuel is introduced into the combustion chamber 11 only when the next intake stroke starts, a delay in the inflow of fuel occurs (Time Delay), and during incipient operation such as idling when operating at theoretical performance ratio Due to the closing of the throttle valve, inflow into the combustion chamber 11 is blocked and negative pressure is generated in the combustion chamber 11, so that resistance between the piston 17 and the inner wall of the cylinder 18 is generated in the downward motion of the piston 17. As a result, the engine efficiency dropped by about 30%.

또한 상기 인젝터(15)가 흡기매니폴드(13)의 흡기코트(14)쪽에 장착된 종래의 가솔린엔진에서의 연소실(11)내로 유입된 공기와 연료의 혼합기를 압축시키는 압축비를 높이는데 노킹에 따른 한계가 있는 단점이 있었다.In addition, the injector 15 increases the compression ratio for compressing a mixture of air and fuel introduced into the combustion chamber 11 in the conventional gasoline engine mounted on the intake coat 14 side of the intake manifold 13. There were limitations.

[발명의 목적][Purpose of invention]

이에 본 발명은 상기와 같은 문제점을 해소하기 위해 발명된 것으로, 엔진의 저부하시와 고부하시에 각기 연료의 분사시기 및 분사시간을 조절하여 희박연소에 의한 연비의 향상과 이론공연비로의 운전을 실시가능케 하면서 기관의 출력향상 및 배기가스저감의 효과를 얻을 수 있도록 된 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진을 제공함에 그 목적이 있다.Accordingly, the present invention has been invented to solve the above problems, by adjusting the injection timing and injection time of the fuel at the low and high load of the engine to improve the fuel efficiency by lean combustion and to operate the theoretical fuel ratio It is an object of the present invention to provide a direct gasoline engine for automobiles having squash pistons, which makes it possible to improve engine output and reduce emissions.

[발명의 구성][Configuration of Invention]

상기와 같은 목적을 달성하기 위한 본 발명은, 흡/배기밸브(1, 2)와 점화플러그(3)를 장착하고 연소실(7)을 갖는 실린더헤드(4)와, 실린더(5)내에서 상하 승강하는 피스톤(6)으로 구성된 것에 있어서; 상기 실린더헤드(4)의 연소실(7)이 대략 삼각주의 지붕형상으로 이루어 지고, 피스톤(6)은 그 상부가 분할되어 일부는 돌출부(6b)가 돌출되고, 이 돌출부(6b)에 단차지게 오목한 형태로 파인오목면(6a)을 갖추고, 연료를 분사하는 인젝터(8)가 연소실(7)내의 상측 가장자리인 흡/배기밸브(1, 2)사이를 향하도록 실린더헤드(4)에 장착되도록 구성되어 있다.The present invention for achieving the above object, the cylinder head (4) having a combustion chamber (7) equipped with intake / exhaust valves (1, 2) and spark plugs (3), up and down in the cylinder (5) In the configuration of the lifting piston (6); The combustion chamber 7 of the cylinder head 4 is formed in the shape of a substantially triangular roof, and the piston 6 is divided in its upper part and a part of the piston 6b protrudes, and is recessed stepwise to the protrusion 6b. It has a fine concave surface 6a in the form, and is configured to be mounted to the cylinder head 4 so that the injector 8 for injecting fuel is directed between the intake / exhaust valves 1 and 2 which are upper edges in the combustion chamber 7. It is.

[실시예]EXAMPLE

이하 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제1a, b, c는 본 발명에 따라 스쿼시피스톤을 갖는 직분식 가솔린 엔진의 개략적인 단면도와 이의 측단면도 및 평면도이다.1a, b, c are schematic cross-sectional views, side cross-sectional views and plan views thereof of a direct gasoline engine having a squash piston in accordance with the present invention;

본 발명은 도면에 도시면 바와 같이, 흡/배기밸브(1)(2)와 점화플러그(3)를 실린더블록의 상부와 실린더헤드(4)가 형성하는 연소실(7)의 상부쪽에 장착하게 된다.As shown in the drawing, the intake / exhaust valve (1) (2) and the spark plug (3) are mounted on the upper side of the combustion chamber (7) formed by the upper part of the cylinder block and the cylinder head (4). .

이 연소실(7)의 내부로 연료를 공급시켜 주는 인젝터(8)는 흡기매니폴드의 흡기포트쪽에 구비하고서 이 인젝터를 통한 연료의 분사가 흡기행정중 흡기밸브(1)가 닫힌상태에서 이루어져 흡기포트내부로 연료가 분사되어 유입되고, 이 흡기포트내에 분사된 연료는 다음번 흡기행정중 흡기밸브(1)의 개방에 따라 연소실내로 유입되어 압축행정을 거쳐 압축된 다음 점화플러그(3)의 점화에 의해 연소가 이루어 지는 것은 일반적인 가솔린엔진과 같다.An injector 8 for supplying fuel to the combustion chamber 7 is provided on the intake port side of the intake manifold, and the injection of fuel through the injector is performed while the intake valve 1 is closed during the intake stroke. Fuel is injected into the inlet, and the fuel injected into the intake port flows into the combustion chamber in accordance with the opening of the intake valve 1 during the next intake stroke, is compressed through a compression stroke, and then ignition of the ignition plug 3. Combustion is carried out like a normal gasoline engine.

한편, 본 발명에서는, 상기 흡/배기밸브(1, 2)와 점화플러그(3)를 장착한 실린더 헤드(4)와 실린더(5)내 피스톤(6)의 상부가 형성하는 연소실(7)이 대략 삼각주의 지붕(Trigonal Roof)으로 이루어 지면서 상기 피스톤(6)이, 이른바 스쿼시피스톤으로 지칭되는 즉 상부면이 일부는 볼록한 돌출부(6b)가 돌출되고, 이에 단차진 상태로 오목한 형태로 파인 오목면(6a)을 각각 분할하여 갖추게 된다.On the other hand, in the present invention, the cylinder head 4 equipped with the intake / exhaust valves 1 and 2 and the spark plug 3 and the combustion chamber 7 formed by the upper part of the piston 6 in the cylinder 5 are provided. A concave surface in which the piston 6 is formed of a roughly trigonal roof, which is referred to as a so-called squash piston, that is, a convex protrusion 6b with a part of which is convex, protrudes in a stepped state. Each of 6a is provided separately.

그리고, 연료를 분사하는 인젝터(8)가 연소실(7)내의 상측 가장자리인 흡/배기밸브(1, 2)사이를 향하도록 실린더헤드(4)에 장착된 구조로 되어 있다.The injector 8 for injecting fuel is mounted on the cylinder head 4 so as to face the intake / exhaust valves 1 and 2 which are upper edges in the combustion chamber 7.

또한 상기 인젝터(8)는 엔진이 저부하시에는 제2a에 도시된 바와 같이, 피스톤(6)의 압축행정중에 연료를 연소실(7)내로 직접 분사(Late Fuel Injection)시키도록 되어 있으며, 엔진이 고부하시에는 제2b도에 도시된 바와 같이, 피스톤(6)의 흡기행정중에 이 피스톤(6)이 하향행정중에 연료를 연소실(7)내로 직접 분사(Early Fuel Injection)시키도록 되어 있다.In addition, the injector 8 is configured to directly inject fuel into the combustion chamber 7 during the compression stroke of the piston 6 as shown in FIG. 2A when the engine is under low load. At the time, as shown in FIG. 2B, during the intake stroke of the piston 6, the piston 6 directly injects fuel into the combustion chamber 7 during the downstroke.

한편, 상기와 같이 인젝터(8)를 통한 연료의 분사시기는 엔진부하에 따른 분사시기 및 소용시간을 나타낸 제3도에 도시된 바와 같이, 엔진의 저부하시 분사(Late Fuel Injection)는 상기 피스톤(6)이 실린더(5)내에서 흡기행정의 하사점 이후이면서 흡기밸브(1)가 닫힌 이후 시점에서부터 피스톤(6)의 압축행정의 상사점이전 시점까지의 사이구간에서 엔진부하에 따라 가변적으로 이루어지며, 엔진의 구부하시, 분사(Early Fuel Injection)는 상기 피스톤(6)이 실린더(5)내에서 흡기행정의 상사점 이후이면서 배기밸브(2)가 닫힌 이후 시점에서부터 피스톤(6)의 압축행정의 상사점 이전 시점까지의 사이구간에서 엔진부하에 따라 가변적으로 이루어진다.On the other hand, as shown in FIG. 3 showing the injection timing and the use time according to the engine load, the injection timing of the fuel through the injector 8 as described above, the low fuel injection of the engine (Late Fuel Injection) is the piston (6) is variable depending on the engine load in the interval between the bottom dead center of the intake stroke and the top dead center of the compression stroke of the piston 6 from the time after the bottom dead center of the intake stroke in the cylinder (5). When the engine is bent, the injection (Early Fuel Injection) is the compression of the piston 6 from the time after the piston 6 is closed after the top dead center of the intake stroke in the cylinder 5 and the exhaust valve 2 is closed. It is variable depending on the engine load in the section until the top dead center of the stroke.

여기서 상기 인젝터(8)를 통한 연료의 분사량은 엔진부하와 회전수를 고려하여 각 엔진조건에 따른 연료의 분사가 각각의 공연비별로 이루어짐을 나타낸 제4도의 도시선에서와 같이 공연비를 만족시키도록 조절된다.Here, the injection amount of fuel through the injector 8 is adjusted to satisfy the air-fuel ratio as shown in FIG. 4 of the city line showing that the injection of the fuel according to each engine condition is made for each air-fuel ratio in consideration of the engine load and the rotation speed. do.

또한, 상기 엔진의 고부하시 분사(Early Fuel Injection)의 시작시기는 제5도의 도시된 바와 같이 인젝터(8)를 통해 분사되는 연료가 엔진의 흡기행정중 피스톤(6)이 하향운동을 할 때 피스톤(6)의 상부면과 접촉됨(Quenching)을 회피할 수 있도록 하는 시점에서 결정된다.In addition, the start timing of the early fuel injection of the engine is the piston when the fuel 6 injected through the injector 8 moves downward during the intake stroke of the engine as shown in FIG. It is determined at a point in time so as to avoid quenching with the upper surface of (6).

이하 본 발명의 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진에서 저부하시 분사(Late Fuel Injection)와 고부하시 분사(Early Fuel Injection)를 각각 설명하면 다음과 같다.Hereinafter, low fuel injection and early fuel injection in an automotive direct gasoline engine having a squash piston of the present invention will be described as follows.

먼저 엔진의 저부하시 분사(Late Fuel Injection)는, 상기 실린더(5)내에서 피스톤(6)이 흡기행정의 하사점 이후 이면서 흡기밸브(1)가 닫힌 이후인 압축행정중에서 엔진부하에 따라 그 시작시점이 가변적으로 조절되면서 종료시간 압축행정의 상사점 이전 시점으로 고정되어 이루어 지는데, 이때 인젝터(8)를 통해 분사되는 연료의 유동은 상승되는 피스톤(6)의 단차진 부위에 의해 유도되어 점화플러그(3)주위로 모여들게되어 연료의 성층화를 아룰 수 있게 되어 희박연소가 가능하게 되는바, 이 시점에서 상기 피스톤(6)의 상측 오목면(6a)은 인젝터(8)를 통해분사된 연료가 실린더(5)와 피스톤(6)사이의 틈새(Crevice)로 유입되지 않도록 연료의 흐름을 점화플러그(3) 주위로 유도할 수 있다.First, the low fuel injection of the engine is performed according to the engine load during the compression stroke in which the piston 6 is after the bottom dead center of the intake stroke in the cylinder 5 and after the intake valve 1 is closed. The start point is variably adjusted and fixed to a point before the top dead center of the end time compression stroke, wherein the flow of fuel injected through the injector 8 is induced by the stepped portion of the raised piston 6 to ignite. When the fuel is injected through the injector 8, the upper concave surface 6a of the piston 6 is allowed to lean around the plug 3 to cover the stratification of the fuel. It is possible to direct the flow of fuel around the spark plug 3 so that it does not enter the crevice between the cylinder 5 and the piston 6.

따라서, 종래에 이 틈새(Crevice)로 유입되어 배기가스중 포함되어 배출되는 유해성분중 하나인 탄화수소(HC)를 줄어 들게 해 준다.Therefore, it reduces the hydrocarbon (HC), which is one of the harmful components introduced into the crevice and discharged in the exhaust gas.

또한, 엔진의 희박시 이에 따른 펌핑손실을 나타낸 제6도에 도시된 바와 같이, 이론공연비로 엔진을 운전했을 때보다 펌핑손실이 대략 25%이상 감소되는 이점이 있었고, 연소실(7)내로 유입되는 질소와 산소의 양이 증가하여 비열비가 증대되면서 연료가 연소실(7)내에 직접 설치된 인젝터(8)를 매개로 직접분사되어 연료의 기화열에 의한 연소실(7)내의 온도저하로 압축비도 증대시킬 수 있게 되므로 본 발명의 스쿼시피스톤을 갖는 직분식 가솔린엔진은 상승된 이론열효율을 발휘할 수 있게 된다. [참고:엔진의 이론열효율=1-(1/압축비) 비열비-1 ]In addition, as shown in FIG. 6 showing the pumping loss according to the leanness of the engine, the pumping loss was reduced by approximately 25% or more than when the engine was operated at the theoretical performance ratio, and the pumping loss was introduced into the combustion chamber 7. As the amount of nitrogen and oxygen increases and the specific heat ratio increases, fuel is directly injected through the injector 8 installed directly in the combustion chamber 7 so that the compression ratio can be increased by lowering the temperature in the combustion chamber 7 due to the heat of vaporization of the fuel. Therefore, the direct gasoline engine having the squash piston of the present invention can exhibit an increased theoretical thermal efficiency. [Reference: Theoretical Thermal Efficiency of the Engine = 1- (1 / Compression Ratio) Specific Heat Ratio-1]

그리고 엔진의 고부하시 분사(Early FJel Injection)는 상기 실린더(5)내에서 피스톤(6)이 흡기행정중, 하향이동되면서 시작되어 엔진부하에 따라 그 종료시점이 가변적으로 조절되면서 이루어지는데, 이때 인젝터(8)를 통해 분사되는 연료는 1차로 흡기밸브(1)를 통한 흡입유동에 편성되어 미립확 촉진되면서 흡기와의 혼합이 잘 이루어지고 2차로 피스톤(6)의 상향이동인 압축행정중 오목면(6a)에 의한 스쿼시유동이 유도되어 연소속도가 증가되어 완전연소에 의한 배기가스의 발생이 줄어들며 엔진의 출력이 향상되게 된다.In addition, the early FJel injection of the engine is started while the piston 6 moves downward in the intake stroke of the cylinder 5, and the end point is variably adjusted according to the engine load. The fuel injected through (8) is firstly formed in the suction flow through the intake valve (1) to facilitate fine granulation, and is well mixed with the intake and concave surface during the compression stroke, which is the upward movement of the piston (6). Squash flow by (6a) is induced to increase the combustion speed, thereby reducing the generation of exhaust gas due to complete combustion and improving the output of the engine.

[발명의 효과][Effects of the Invention]

이상 설명한 바와 같이 본 발명 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진에 의하면, 이론공연비로 운전할 때 연료의 분사가 연소실(7)내에 장착된 인젝터(8)에 의해 이루어져 분사된 연료의 기화시 연소실(7)이 냉각되어 흡입공기의 충진효율이 향상되고, 연소온도 또한 저하되어 노킹발생이 억제된다.As described above, according to the present invention, a direct gasoline engine for automobiles having squash pistons, when driving at theoretical performance ratio, the injection of fuel is made by the injector 8 mounted in the combustion chamber 7, and the combustion chamber during vaporization of the injected fuel ( 7) is cooled to improve the filling efficiency of the intake air, the combustion temperature is also lowered, knocking is suppressed.

또, 압축비가 증대되므로 엔진출력이 10%이상 향상되는 한편, 연소실(7)내의 연료가 직접 분사되어 냉각시동시 이론공연비로의 운전이 가능하면서 이에 따라 일산화탄소의 발생이 저감되면서 가/감속운전시 연료가 포트벽에 접촉되지 않으므로 정밀한 공연비제가 가능하여 탄화수소배출이 저감되고, 인젝터(8)로부터 분사된 연료는 연소실(7)내에서 전부 연소되어 출력으로 전환되므로 엔진의 응답성이 향상되어 운전성이 개선될 수 있는 이점이 있게된다.In addition, since the compression ratio is increased, the engine output is improved by 10% or more, while the fuel in the combustion chamber 7 is directly injected to allow the operation to the theoretical performance ratio at the time of cooling, thereby reducing the generation of carbon monoxide. Since the fuel does not come into contact with the port wall, a precise air-fuel ratio is possible, thereby reducing hydrocarbon emissions, and the fuel injected from the injector 8 is completely burned in the combustion chamber 7 and converted into output, thereby improving the response of the engine and driving performance. There is an advantage that can be improved.

Claims (1)

흡/배기밸브(1, 2)와 점화플러그(3)를 장착하고 연소실(7)을 갖는 실린더 헤드(4)와, 실린더(5)내에서 상하 승강하는 피스톤(6)으로 구성된 것에 있어서; 상기 실린더헤드(4)의 연소실(7)이 대략 삼각주의 지붕형상으로 이루어 지고, 피스톤(6)은 그 상부가 분할되어 일부는 돌출부(6b)가 돌출되고, 이 돌출부(6b)에 단차지게 오목한 형태로 파인오목면(6a)을 갖추고, 연료를 분사하는 인젝터(8)가 연소실(7)내의 상측 가장자리인 흡/배기밸브(1, 2)사이를 향하도록 실린더헤드(4)에 장착되어 구성된 스쿼시피스톤을 갖는 자동차용 직분식 가솔린엔진.A cylinder head (4) equipped with intake / exhaust valves (1, 2) and spark plugs (3), having a combustion chamber (7), and a piston (6) which moves up and down in the cylinder (5); The combustion chamber 7 of the cylinder head 4 is formed in the shape of a substantially triangular roof, and the piston 6 is divided in its upper part and a part of the piston 6b protrudes, and is recessed stepwise to the protrusion 6b. It has a fine concave surface 6a in the form and is mounted to the cylinder head 4 so that the injector 8 for injecting fuel is directed between the intake / exhaust valves 1 and 2, which are upper edges in the combustion chamber 7. Automotive direct gasoline engine with squash pistons.
KR1019960015869A 1996-05-14 1996-05-14 Gasoline engine for a car having a squash piston KR0184165B1 (en)

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