KR19980074021A - Combustion chamber variable of engine - Google Patents
Combustion chamber variable of engine Download PDFInfo
- Publication number
- KR19980074021A KR19980074021A KR1019970009646A KR19970009646A KR19980074021A KR 19980074021 A KR19980074021 A KR 19980074021A KR 1019970009646 A KR1019970009646 A KR 1019970009646A KR 19970009646 A KR19970009646 A KR 19970009646A KR 19980074021 A KR19980074021 A KR 19980074021A
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- South Korea
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- engine
- oil
- combustion chamber
- compression ratio
- supplied
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 39
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 28
- 230000008859 change Effects 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
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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
- F02B75/00—Other engines
- F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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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)
Abstract
본 발명은 엔진의 연소실 가변장치에 관한 것으로, 엔진의 성능은 과급압력을 높이거나 흡기 온도를 높이고 점화시기의 조정에 따라 결정되므로, 엔진의 최적화를 위하여 연소실내의 압축비의 향상은 무엇보다 중요하게 대두되고 있다.The present invention relates to a combustion chamber variable apparatus of an engine, and the performance of the engine is determined by increasing the supercharging pressure, increasing the intake temperature, and adjusting the ignition timing. Therefore, the improvement of the compression ratio in the combustion chamber is most important for the optimization of the engine. It is emerging.
특히, 일반적인 엔진의 경우에는 연소실의 정형화되어 있고 압축비가 일정하나 엔진의 출력향상을 위하여 압축비를 높이는 경우에는 흡입가스가 자연 발화하는 노킹을 발생하여 밸브기구의 손상과 피스톤의 손상을 일으키는 문제점이 있었다.In particular, in the case of a general engine, the combustion chamber is standardized and the compression ratio is constant, but when the compression ratio is increased to improve the output of the engine, there is a problem that the intake gas is spontaneously ignited, causing damage to the valve mechanism and piston. .
이에, 본 발명은 예시도면 도 2 내지 도 3 에서와 같이 오일을 공급하여 주는 오일펌프(16)와 공급된 오일의 역류를 방지하여 주는 체크밸브(20)로 구성된 오일공급부(10), 연소실의 상단 실린더헤드(34)에 장착되어 상기 오일공급부(10)에서 공급되는 오일의 유입으로 연소실(30) 체적이 가변되는 작동부(12), 오일팬으로 오일이 복귀되는 작은지름의 관로인 유출구(32)로 구성된 배출부(14)로 이루어진 것이다.Thus, the present invention is an oil supply unit 10, the combustion chamber consisting of an oil pump 16 for supplying oil and a check valve 20 for preventing back flow of the supplied oil as shown in FIGS. An operating part 12 mounted on the upper cylinder head 34 to change the volume of the combustion chamber 30 by the inflow of the oil supplied from the oil supply part 10, and an outlet of a small diameter conduit through which oil is returned to the oil pan ( 32 is composed of a discharge portion (14).
따라서, 본 발명은 엔진의 회전수에 따라 유압이 증가하고 감소함에 따라 압축피스톤은 승하강하여 연소실의 체적이 가변하게 되므로, 전 영역의 엔진의 회전수에 따라 엔진의 압축비는 최적화되어 엔진의 성능이 향상되는 효과가 있다.Therefore, according to the present invention, as the hydraulic pressure increases and decreases according to the rotational speed of the engine, the compression piston moves up and down so that the volume of the combustion chamber is variable, so that the compression ratio of the engine is optimized according to the rotational speed of the engine of the entire area, thereby improving the performance of the engine. There is an effect to be improved.
Description
본 발명은 엔진의 연소실 가변장치에 관한 것으로, 더욱 상세하게는 엔진의 연소실을 가변적으로 변화시켜서 엔진의 회전수에 따른 최적의 압축비를 얻을 수 있는 엔진의 연소실 가변장치에 관한 것이다.The present invention relates to a combustion chamber variable apparatus of an engine, and more particularly, to a combustion chamber variable apparatus of an engine capable of variably changing the combustion chamber of an engine to obtain an optimum compression ratio according to the rotational speed of the engine.
일반적으로 엔진은 차량의 동력을 발생시키는 중요한 부분으로, 연소실에서 발생한 열에너지를 기계적 일로 바꾸는 기관이며 피스톤의 직선운동을 회전운동으로 바꾸기 위하여 피스톤과 크랭크축을 커넥팅로드로 연결한 기구로 이루어졌으며, 혼합기를 흡입하고 압축한 다음 점화 연소시켜 연소가스를 배출하는 흡입, 압축, 폭발, 배기의 4단계를 반복하여 동력을 발생시킨다.In general, the engine is an important part that generates the power of the vehicle, an engine that converts thermal energy generated from the combustion chamber into mechanical work, and consists of a mechanism that connects the piston and the crankshaft with connecting rods to convert the linear motion of the piston into rotational motion. Suction, compression, ignition and combustion to generate power by repeating four stages of suction, compression, explosion, and exhaust.
예시도면 도 1 은 엔진의 구조를 나타낸 도면으로, 엔진(1)은 그 형식에 따라 여러 가지 형식의 것이 있고, 그 구조는 각각 다른점이 있으나 기본적으로 엔진(1)의 기본구조는 거의 동일하다.Exemplary Drawings FIG. 1 is a diagram showing the structure of an engine. The engine 1 has various types according to its type, and the structure thereof is different, but the basic structure of the engine 1 is basically the same.
엔진(1)을 대별하면 정지부품과 운동부품과 각종 부속장치로 구분되는데, 엔진(1)의 주요부는 실린더블록(2), 실린더헤드(3), 피스톤 커넥팅로드 어셈블리(4), 크랭크축(5) 및 밸브기구(6) 등으로 구성되어 있다.The engine (1) is roughly divided into a stationary part, a moving part, and various accessories. The main part of the engine (1) includes a cylinder block (2), a cylinder head (3), a piston connecting rod assembly (4), and a crank shaft ( 5) and the valve mechanism 6 or the like.
따라서, 엔진(1)의 각 실린더블록(2) 안에는 피스톤과 커넥팅로드가 연결된 피스톤 커넥팅로드 어셈블리(4)가 장착되어 있고 커넥팅로드의 하단에는 크랭크축(5)이 연결되어 있어 피스톤이 왕복 운동을 하면, 크랭크축(5)은 회전운동을 하게된다.Therefore, each cylinder block 2 of the engine 1 is equipped with a piston connecting rod assembly 4 in which a piston and a connecting rod are connected, and a crank shaft 5 is connected to the lower end of the connecting rod so that the piston reciprocates. The crankshaft 5 is then rotated.
또한, 실린더블록(2)의 상부에는 실린더헤드(3)가 있으며, 이 실린더헤드(3)의 하단부는 연소실(7)의 일부가 되며 이 부분에는 캠축에 의해서 구동되는 흡기밸브와 배기밸브가 설치되어 있다.In addition, a cylinder head 3 is located above the cylinder block 2, and a lower end of the cylinder head 3 becomes part of the combustion chamber 7, and an intake valve and an exhaust valve driven by a camshaft are installed in this part. It is.
따라서, 흡기밸브와 배기밸브가 개폐하여 엔진(1)의 연소실(7)내로 혼합기가 흡입되고 피스톤의 작용으로 압축되고 점화플러그(8)에 의해서 점화된 압축공기가 배기가스로 배출되는 것이다.Therefore, the intake valve and the exhaust valve are opened and closed, the mixer is sucked into the combustion chamber 7 of the engine 1, compressed by the action of the piston, and the compressed air ignited by the spark plug 8 is discharged as exhaust gas.
상술된 바와 같이 엔진(1)의 동력행정은 흡기밸브에서 공급되는 홉합기가 피스톤의 왕복운동으로 연소실에서 압축되고 점화플러그(8)의 스파크에 의해서 폭발하여 연소의 과정을 거치면서 크랭크축(5)으로 동력을 전달시키고 배기밸브로 배기가스가 배출된다.As described above, the power stroke of the engine 1 includes the crankshaft (5), in which the hop-mixer supplied from the intake valve is compressed in the combustion chamber by the reciprocating motion of the piston and exploded by the spark of the spark plug 8 to undergo the process of combustion. ) Power is transmitted and exhaust gas is discharged through exhaust valve.
그러나, 상기한 엔진(1)의 성능은 과급압력을 높이거나 흡기 온도를 높이고 점화시기의 조정에 따라 결정되는 바, 엔진(1)의 최적화를 위하여 연소실(7)내의 압축비의 향상은 무엇보다 중요하게 대두되고 있다.However, the performance of the engine 1 is determined by increasing the boost pressure or raising the intake temperature and adjusting the ignition timing. Therefore, the improvement of the compression ratio in the combustion chamber 7 is most important for the optimization of the engine 1. Is emerging.
특히, 일반적인 엔진(1)의 경우에는 연소실(7)의 정형화되어 있어 압축비가 일정하나 엔진(1)의 출력향상을 위하여 압축비를 높이는 경우도 있지만, 이는 흡입가스가 자연 발화하는 노킹을 발생시켜서 밸브기구의 손상과 피스톤의 손상을 일으키는 문제점이 있었다.Particularly, in the case of the general engine 1, the combustion chamber 7 is standardized, and the compression ratio is constant. However, the compression ratio may be increased to improve the output of the engine 1, but this causes a knocking in which the intake gas naturally ignites. There was a problem causing damage to the mechanism and damage to the piston.
이에 본 발명은 상기한 종래 기술이 지닌 문제점을 해소시키기 위하여 안출된 것으로, 엔진 출력의 변화에 따라 연소실의 체적을 가변적으로 변화시켜서 이에 흡입되는 혼합가스의 압축비를 향상시키고 엔진의 최적화를 이루며 엔진의 출력을 향상시키는 엔진의 연소실 가변장치를 제공하는데 발명의 목적이 있다.Accordingly, the present invention has been made to solve the above problems of the prior art, by varying the volume of the combustion chamber in accordance with the change of the engine output to improve the compression ratio of the mixed gas sucked therein and to achieve the optimization of the engine It is an object of the invention to provide a combustion chamber variable device of an engine that improves the power.
상기와 같은 목적을 실현하기 위한 본 발명은 오일펌프에 의해서 오일파이프로 오일이 공급되는 오일공급부와, 실린더헤드의 연소실 상부에 설치되어 엔진의 출력에 따라 상하로 운동하는 압축피스톤과 리턴스프링으로 이루어진 작동부와, 오일이 배출되는 배출구로 구성된 것이다.The present invention for realizing the above object consists of an oil supply unit is supplied to the oil pipe by the oil pump, the compression piston and the return spring is installed in the upper combustion chamber of the cylinder head to move up and down according to the output of the engine It consists of an operating part and an outlet through which oil is discharged.
따라서, 본 발명은 차량의 속도에 따라 지속적으로 증감하는 엔진의 출력에 의하여 작동하는 오일펌프가 엔진의 상부에 성형된 챔버로 오일을 공급하여 연소실의 체적을 변화시키는 것으로, 엔진의 회전수의 변화에 따라 압축피스톤이 승하강하여 최적의 압축비를 형성시켜서 엔진의 성능을 향상시키는 것이다.Accordingly, the present invention is to change the volume of the combustion chamber by supplying oil to the chamber formed in the upper portion of the engine of the oil pump operating by the output of the engine continuously increasing or decreasing according to the speed of the vehicle, As the compression piston moves up and down to form an optimal compression ratio, the performance of the engine is improved.
도 1 은 종래 엔진의 구조를 나타낸 개요도,1 is a schematic diagram showing the structure of a conventional engine;
도 2 는 본 발명에 따른 연소실 가변장치의 구성도,2 is a configuration diagram of a combustion chamber variable apparatus according to the present invention;
도 3 은 본 발명에 따른 연소실 가변장치가 장착된 상태를 나타낸 개요도이다.3 is a schematic view showing a state in which a combustion chamber variable apparatus according to the present invention is mounted.
- 도면의 주요부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawings-
10 - 오일공급부, 12 - 작동부,10-oil supply, 12-actuator,
14 - 배출부, 16 - 오일펌프,14-outlet, 16-oil pump,
18 - 오일파이프, 20 - 체크밸브,18-oil pipe, 20-check valve,
22 - 챔버, 24 - 리프터,22-chamber, 24-lifter,
26 - 리턴스프링, 28 - 압축피스톤,26-return spring, 28-compression piston,
30 - 연소실, 32 - 유출구,30-combustion chamber, 32-outlet,
34 - 실린더헤드.34-cylinder head.
이하 본 발명을 첨부된 예시도면에 의거하여 구성과 작용을 상세히 설명하면 다음과 같다.Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.
본 발명은 오일을 공급하여 주는 오일펌프(16)와 공급된 오일의 역류를 방지하여 주는 체크밸브(20)로 구성된 오일공급부(10)와, 연소실의 상단 실린더헤드(34)에 장착하되 상기 오일공급부(10)에서 공급되는 오일의 의해서 연소실(30) 체적이 가변되는 작동부(12)와, 오일팬으로 오일이 복귀되는 작은지름의 관로인 유출구(32)로 구성된 배출부(14)로 이루어진 엔진의 연소실 가변장치이다.The present invention is mounted on the oil supply unit 10 and the upper cylinder head 34 of the combustion chamber consisting of an oil pump 16 for supplying oil and a check valve 20 for preventing a back flow of the supplied oil. The discharge part 14 is composed of an operation part 12 in which the volume of the combustion chamber 30 is changed by the oil supplied from the supply part 10, and an outlet port 32, which is a small diameter conduit through which oil is returned to the oil pan. It is a combustion chamber variable device of an engine.
예시도면 도 2 는 본 발명에 따른 연소실 가변장치의 구성도이고, 도 3 은 본 발명에 따른 연소실 가변장치가 장착된 상태를 나타낸 개요도로서, 이하 이를 상세히 설명하면 다음과 같다.2 is a configuration diagram of a combustion chamber variable apparatus according to the present invention, Figure 3 is a schematic view showing a state in which the combustion chamber variable apparatus according to the present invention is described below.
상기 오일펌프(16)는 엔진의 오일팬에 장착되며, 작동부(12)로 오일을 공급하여 주기 위하여 오일파이프(18)로 연결되어 있다.The oil pump 16 is mounted on the oil pan of the engine, and is connected to the oil pipe 18 to supply oil to the operation unit 12.
또한, 작동부(12)는 챔버(22)로 공급되는 오일의 압력에 의해서 실린더헤드(34)내로 하강하는 리프터(24)와 일체로 이루어진 압축피스톤(28)이 설치되고, 이를 상승시켜주는 리턴스프링(26)이 삽입되어 있다.In addition, the operation unit 12 is provided with a compression piston 28 integrally formed with the lifter 24 which is lowered into the cylinder head 34 by the pressure of the oil supplied to the chamber 22, the return to raise it The spring 26 is inserted.
즉, 리프터(24)는 유압에 의해서 하강할 수 있도록 챔버(22)의 하부에 설치되어 있고, 리프터(24)의 하단에 일체로 부착된 압축피스톤(28)은 그 형상이 원통형으로 성형되어 실린더헤드(34)내로 승하강하여 연소실(30)의 체적을 가변시킬 수 있도록 설치되어 있으며, 리턴스프링(26)은 하강된 압축스프링(28)이 복귀될 수 있도록 리프터(24)의 하단에 설치되어 있다.That is, the lifter 24 is installed in the lower part of the chamber 22 so that it can be lowered by the hydraulic pressure, the compression piston 28 integrally attached to the lower end of the lifter 24 is formed in a cylindrical shape and the cylinder It is installed to ascend and descend the head 34 to change the volume of the combustion chamber 30, the return spring 26 is installed at the lower end of the lifter 24 so that the lowered compression spring 28 can be returned. .
그리고, 배출구(14)는 상기 챔버(22)의 일측에 형성된 지름이 작은 관로이며, 오일펌프(16)가 설치된 오일팬으로 연결되어 있다.In addition, the outlet 14 is a small diameter conduit formed on one side of the chamber 22, and is connected to an oil pan provided with an oil pump 16.
이하, 본 장치의 작용은 후술되는 바와 같다.Hereinafter, the operation of the apparatus is as described later.
오일펌프(16)는 엔진의 크랭크축에 치합된 구동기어에 의해서 작동하는 것으로, 엔진의 회전수에 대응하는 압축된 오일을 오일파이프(18)를 통하여 챔버(22)로 공급하게 되고, 상기 공급된 오일의 유압에 의해서 리프터(24)와 일체로 성형된 압축피스톤(28)이 하강되는 것이다.The oil pump 16 is operated by a drive gear engaged with the crankshaft of the engine. The oil pump 16 supplies the compressed oil corresponding to the engine speed to the chamber 22 through the oil pipe 18. The compressed piston 28 integrally formed with the lifter 24 is lowered by the hydraulic pressure of the oil.
즉, 상기 압축피스톤(28)의 하강으로 엔진의 회전수에 따른 연소실(30)의 체적은 감소하고 여기에 흡입된 혼합가스는 고압축비를 얻을 수 있다.That is, as the compression piston 28 descends, the volume of the combustion chamber 30 according to the engine speed decreases, and the mixed gas sucked therein may obtain a high compression ratio.
반면 엔진의 회전수가 감소하면 이에 대응하는 압축된 오일이 오일파이프(18)로 공급되고 이와 동시에 유출구(32)로는 오일이 지속적으로 배출되어 압축피스톤(28)은 오일압의 차이만큼 상승하게 되며, 리턴스프링(26)은 압축피스톤(28)의 상승을 보좌한다.On the other hand, when the engine speed decreases, the corresponding compressed oil is supplied to the oil pipe 18 and at the same time, the oil is continuously discharged to the outlet 32 so that the compression piston 28 rises by the difference in oil pressure. The return spring 26 assists in raising the compression piston 28.
따라서, 압축피스톤(28)은 상승하여 엔진의 회전수가 감소한 상태의 연소실(30) 체적을 얻게되어 엔진이 최적의 상태에서 연소하여 폭발하는 것이다.Therefore, the compression piston 28 rises to obtain the volume of the combustion chamber 30 in which the rotation speed of the engine is reduced, so that the engine burns and explodes in an optimal state.
또한, 오일파이프(18)에 설치된 체크밸브(20)는 상기와 같은 엔진의 폭발력에 의해서 압축피스톤(28)이 상승하는 것을 방지하기 위하여 설치된 것으로, 챔버(22)내의 오일이 오일펌프(16)쪽으로 역류하는 것을 방지한다.In addition, the check valve 20 installed in the oil pipe 18 is installed to prevent the compression piston 28 from rising by the explosion force of the engine as described above, and the oil in the chamber 22 is the oil pump 16. Prevent backflow to the side.
상술된 바와 같이 본 발명은 엔진의 회전수에 따라 오일을 공급하여 주는 오일공급부와 연소실의 체적을 가변시켜 주는 압축피스톤과 리턴스프링으로 이루어진 작동부 및 오일이 배출되는 배출부로 이루어진 것으로, 엔진의 회전수에 따라 유압이 증가하고 감소함에 따라 압축피스톤은 승하강하여 연소실의 체적이 가변하게 되므로, 전 영역의 엔진의 회전수에 따라 엔진의 압축비는 최적 화되어 엔진의 성능이 향상되는 효과가 있다.As described above, the present invention is composed of an oil supply unit for supplying oil according to the number of revolutions of the engine, an operation unit consisting of a compression piston and a return spring for varying the volume of the combustion chamber, and an oil discharge unit for discharging the engine. As the hydraulic pressure increases and decreases with the number, the compression piston moves up and down so that the volume of the combustion chamber is variable. Therefore, the compression ratio of the engine is optimized according to the number of revolutions of the engine in all areas, thereby improving the performance of the engine.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970009646A KR100231333B1 (en) | 1997-03-21 | 1997-03-21 | Combustion chamber variable of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970009646A KR100231333B1 (en) | 1997-03-21 | 1997-03-21 | Combustion chamber variable of engine |
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| Publication Number | Publication Date |
|---|---|
| KR19980074021A true KR19980074021A (en) | 1998-11-05 |
| KR100231333B1 KR100231333B1 (en) | 1999-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019970009646A Expired - Fee Related KR100231333B1 (en) | 1997-03-21 | 1997-03-21 | Combustion chamber variable of engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030017825A (en) * | 2001-08-23 | 2003-03-04 | 현대자동차주식회사 | Variable device of compression ratio for diesel engine |
| KR101510352B1 (en) * | 2013-12-30 | 2015-04-08 | 현대자동차 주식회사 | Variable compression ratio engine |
| US9470144B2 (en) | 2013-10-16 | 2016-10-18 | Hyundai Motor Company | Variable compression ratio engine |
| CN109973213A (en) * | 2019-04-30 | 2019-07-05 | 郑州航空工业管理学院 | Energy-saving compression ignition engine with continuously variable compression ratio and flexible operation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100373016B1 (en) * | 2000-08-21 | 2003-02-25 | 현대자동차주식회사 | Variable compression ratio system |
-
1997
- 1997-03-21 KR KR1019970009646A patent/KR100231333B1/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030017825A (en) * | 2001-08-23 | 2003-03-04 | 현대자동차주식회사 | Variable device of compression ratio for diesel engine |
| US9470144B2 (en) | 2013-10-16 | 2016-10-18 | Hyundai Motor Company | Variable compression ratio engine |
| KR101510352B1 (en) * | 2013-12-30 | 2015-04-08 | 현대자동차 주식회사 | Variable compression ratio engine |
| CN109973213A (en) * | 2019-04-30 | 2019-07-05 | 郑州航空工业管理学院 | Energy-saving compression ignition engine with continuously variable compression ratio and flexible operation |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100231333B1 (en) | 1999-11-15 |
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