KR100233734B1 - Apparatus for reducing of nox in an engine - Google Patents
Apparatus for reducing of nox in an engine Download PDFInfo
- Publication number
- KR100233734B1 KR100233734B1 KR1019960062393A KR19960062393A KR100233734B1 KR 100233734 B1 KR100233734 B1 KR 100233734B1 KR 1019960062393 A KR1019960062393 A KR 1019960062393A KR 19960062393 A KR19960062393 A KR 19960062393A KR 100233734 B1 KR100233734 B1 KR 100233734B1
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- South Korea
- Prior art keywords
- engine
- air
- nox
- combustion chamber
- piston
- Prior art date
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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
- 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
-
- 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
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
-
- 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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
본 발명은 엔진의 NOx저감 장치에 관한 것으로서, 연소실에 공기를 분사할 수 있는 에어 인젝터를 설치하여 엔진의 피스톤이 상사점을 지나 고압의 혼합기가 폭발한 직후에 실린더 헤드에 설치된 에어 인젝터로 신선한 공기를 연소실로 분사하도록 함으로써, 저온의 분위기로 NOx발생을 억제하면서도, 새로운 공기에 의한 후연소로 피스톤에 전해지는 동력을 증대하여 엔진의 열손실을 저감할 수 있도록 하는 효과가 있다.The present invention relates to an apparatus for reducing NOx of an engine, in which an air injector capable of injecting air into a combustion chamber is installed so that fresh air is provided by an air injector installed in a cylinder head immediately after the piston of the engine passes through a top dead center and the high pressure mixer explodes. By injecting the fuel into the combustion chamber, while suppressing the generation of NOx in a low temperature atmosphere, there is an effect of increasing the power transmitted to the piston by post-combustion by new air to reduce heat loss of the engine.
Description
제1도는 일반적인 연소실의 형상을 도시한 구조도.1 is a structural diagram showing the shape of a general combustion chamber.
제2도는 본 발명에 따른 NOx저감 장치를 도시한 개략도.2 is a schematic view showing a NOx reduction apparatus according to the present invention.
제3도는 본 발명에 따른 NOx저감 장치가 적용되었을 때 엔진의 거동을 도시한 것으로서,Figure 3 shows the behavior of the engine when the NOx reduction device according to the present invention is applied,
(a)도는 피스톤의 작동 상태도.(a) is the operating state of the piston.
(b)도는 피스톤의 운동에 따른 압력선도.(b) is a pressure diagram according to the movement of the piston.
(c)도는 시간에 대한 온도선도이다.(c) is a temperature plot with respect to time.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 에어 인젝터 50 : 실린더1: air injector 50: cylinder
51 : 실린더 헤드 52 : 피스톤51: cylinder head 52: piston
53 : 연소실 B : 하사점53: combustion chamber B: bottom dead center
T : 상사점T: Top dead center
본 발명은 엔진의 연소실에서 발생하는 NOx를 저감시킬 수 있는 장치에 관한 것이다.The present invention relates to an apparatus capable of reducing NOx generated in a combustion chamber of an engine.
일반적으로 엔진은 제1도에 도시된 바와 같이 실린더(50)와 실린더 헤드(51) 및 피스톤(52)으로 이루어지는 연소실(53)에서 연료를 폭발시켜 상기 피스톤(52)에 직선 운동력을 제공하고, 상기 피스톤(52)은 상기 실린더(50) 내에서 직선 왕복 운동을 하면서 크랭크 샤프트(54)에 회전력을 발생시키도록 되어 있다.In general, the engine explodes fuel in the combustion chamber 53 including the cylinder 50, the cylinder head 51, and the piston 52 to provide linear motion to the piston 52, as shown in FIG. The piston 52 is configured to generate a rotational force on the crankshaft 54 while linearly reciprocating in the cylinder 50.
상기와 같은 연소실(53)에는 점화 플러그(55)가 형성되어 흡기 밸브(56)를 통해 유입된 혼합기를 점화하도록 되어 있으며, 상기와 같이 점화된 화면이 연소실(53) 내부로 확산되어 연소 작용이 수행된다.In the combustion chamber 53 as described above, a spark plug 55 is formed to ignite the mixer introduced through the intake valve 56, and the screen ignited as described above is diffused into the combustion chamber 53 so that the combustion action is performed. Is performed.
상기와 같은 혼합기의 연소작용에서 발생되는 물질 중에는 NOx(질소화합물)이 있는 바, 상기 NOx는 대기중에서 인체에 치명적인 발암물질로 작용하며, 식물의 기능장애 및 성장억제 등을 유발하는 등 엔진에서 발생하는 대표적인 유해물질로서, 배기 가스 규제의 대상이 되고 있다.There is NOx (nitrogen compound) among the substances generated in the combustion action of the mixer, the NOx acts as a carcinogen that is fatal to the human body in the air, and occurs in the engine such as causing plant dysfunction and growth inhibition As a representative hazardous substance, it is a target of exhaust gas regulation.
상기 NOx의 주요 발생원인을 보면 혼합기가 주로 고온의 상태에서 연소될 때 많이 생성되므로, 이를 저감하기 위해서는 온도의 저감이 필수적이다.In view of the main causes of NOx, a lot of the mixture is generated when the mixture is mainly burned at a high temperature, so to reduce the temperature, it is essential to reduce the temperature.
그러나, 상기와 같은 온도의 저감은 엔진의 열효율 측면에서 매우 불리한 요소이므로 이에 대한 많은 개선책이 제시되고 있으나, 효과적으로 엔진의 열효율에 장애가 되지 않으면서 NOx발생 저감을 실현하는 방법은 제시되고 있지 못한 실정이다.However, the above temperature reduction is a very disadvantageous factor in terms of the thermal efficiency of the engine, and many improvements have been suggested. However, there is no method for effectively reducing the NOx generation without impeding the thermal efficiency of the engine. .
따라서, 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, NOx 저감을 위해 혼합기의 연소온도를 낮추면서도 엔진의 열효율의 저해하지 않을 수 있도록 한 엔진의 NOx저감 장치를 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide an apparatus for reducing NOx of an engine, which is designed to solve the problems as described above, so as not to hinder the thermal efficiency of the engine while lowering the combustion temperature of the mixer for reducing NOx. have.
상기한 바와 같은 목적을 달성하기 위한 본 발명은 엔진의 연소실에 공기를 직접 분사하는 에어 인젝터와, 크랭크샤프트의 회전각을 감지하는 크랭크각 센서와, 상기 크랭크각 센서의 신호에 따라 상기 에어 인젝터를 제어하는 ECU를 구성된 것을 특징으로 한다.The present invention for achieving the above object is an air injector for directly injecting air into the combustion chamber of the engine, a crank angle sensor for detecting the rotation angle of the crankshaft, and the air injector according to the signal of the crank angle sensor Characterized in that the ECU to control.
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.
제2도는 본 발명에 따른 NOx저감 장치가 도시된 것으로서, 엔진의 연소실(53) 상부 실린더 헤드(51)부분에 설치되어 공기를 분사하는 에어 인젝터(1)와, 크랭크샤프트의 회전각을 감지하는 크랭크각 센서(2)와, 상기 크랭크각 센서(2)의 신호에 따라 상기 에어 인젝터(1)를 제어하는 ECU(3)로 구성된다.2 is a view showing a NOx reduction device according to the present invention, which is installed in an upper cylinder head 51 portion of an engine combustion chamber 53 to inject air and detects a rotation angle of a crankshaft. The crank angle sensor 2 and the ECU 3 which controls the air injector 1 according to the signal of the crank angle sensor 2 are comprised.
따라서, 상기 에어 인젝터(1)는 ECU(3)의 제어에 따라 필요한 시기에만 공기를 원하는 압력으로 분사할 수 있게 된다.Therefore, the air injector 1 can inject air at a desired pressure only when necessary under the control of the ECU 3.
여기서, 제3도를 참조하여 상기와 같은 NOx저감 장치를 사용하는 방법과 그 작용 및 효과를 살펴보면 다음과 같다.Here, referring to FIG. 3, the method of using the NOx reduction device as described above, its operations and effects are as follows.
먼저 제3(a)도는 실린더(50)내에서 피스톤(52)의 운동상태를 도시한 것으로서 피스톤(52)이 하사점(B)으로부터 상사점(T)을 경유하여 다시 하사점(B)으로 향하는 운동을 할 때, 상기 상사점(T)에 이르기 직전에 혼합기에 점화가 이루어지고, 피스톤(52)이 상사점(T)을 경유하는 동안 혼합기는 불꽃의 전파 지연에 따른 착화지연을 거친 후 폭발하면서 급팽창하여 피스톤(52)에 동력을 전달하게 된다.First, FIG. 3 (a) shows the state of movement of the piston 52 in the cylinder 50. The piston 52 moves from the bottom dead center B to the bottom dead center B again via the top dead center T. FIG. In the heading movement, the mixer is ignited just before reaching the top dead center T, and after the piston 52 passes through the top dead center T, the mixer has undergone ignition delay due to the propagation delay of the flame. It explodes while exploding and transmits power to the piston 52.
이때, 상기 폭발이 시작된 직후는 엔진의 열손실이 가장 적은 때로서, 이 시기에 상기 에어 인젝터(1)로부터 연소실(53) 내에 새로운 공기를 유입시키면 제3(c)도에 도시된 바와 같이 혼합기의 연소 온도가 하강하게 되어 NOx의 발생이 억제되는 효과를 얻을 수 있다.At this time, immediately after the explosion is started, when the heat loss of the engine is the least, and when fresh air is introduced into the combustion chamber 53 from the air injector 1 at this time, as shown in FIG. The combustion temperature of is lowered, and the effect that generation | occurrence | production of NOx is suppressed can be acquired.
또한, 상기와 같은 신기의 유입은 연소실(53) 내부의 미연소 가스가 후연소할 수 있도록 하여 제3(b)도에 도시된 바와 같이 피스톤(52)의 하향운동에 더 많은 동력을 제공할 뿐만 아니라, 혼합기의 완전연소를 촉진하여 NOx이외에 HC와 같은 미연소 가스의 배출을 억제할 수 있는 효과도 있다.In addition, the introduction of the new air allows the unburned gas inside the combustion chamber 53 to be post-burned, thereby providing more power to the downward motion of the piston 52 as shown in FIG. 3 (b). In addition, there is an effect of promoting the complete combustion of the mixer to suppress the discharge of unburned gas such as HC in addition to NOx.
이상과 같이 본 발명은 엔진의 연소실에 공기를 분사할 수 있는 에어 인젝터를 설치하여 엔진의 피스톤이 상사점을 지나 고압의 혼합기가 폭발한 직후에 실린더 헤드에 설치된 에어 인젝터로 신선한 공기를 연소실로 분사하도록 함으로써, 저온의 분위기로 NOx발생을 억제하면서도, 새로운 공기에 의한 후연소로 피스톤에 전해지는 동력을 증대하여 엔진의 열손실을 저감할 수 있도록 하는 효과가 있다.As described above, the present invention installs an air injector capable of injecting air into the combustion chamber of the engine, so that fresh air is injected into the combustion chamber by an air injector installed in the cylinder head immediately after the piston of the engine passes through the top dead center and the high pressure mixer explodes. By suppressing the generation of NOx in a low temperature atmosphere, it is possible to increase the power transmitted to the piston by post-combustion by new air and to reduce the heat loss of the engine.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960062393A KR100233734B1 (en) | 1996-12-06 | 1996-12-06 | Apparatus for reducing of nox in an engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960062393A KR100233734B1 (en) | 1996-12-06 | 1996-12-06 | Apparatus for reducing of nox in an engine |
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| Publication Number | Publication Date |
|---|---|
| KR19980044318A KR19980044318A (en) | 1998-09-05 |
| KR100233734B1 true KR100233734B1 (en) | 1999-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019960062393A KR100233734B1 (en) | 1996-12-06 | 1996-12-06 | Apparatus for reducing of nox in an engine |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03111636A (en) * | 1989-09-27 | 1991-05-13 | Toyota Motor Corp | Exhaust emission purification for two-cycle engine |
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1996
- 1996-12-06 KR KR1019960062393A patent/KR100233734B1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03111636A (en) * | 1989-09-27 | 1991-05-13 | Toyota Motor Corp | Exhaust emission purification for two-cycle engine |
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| KR19980044318A (en) | 1998-09-05 |
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