KR100249559B1 - Secondary air supply system of vehicle exhaust system - Google Patents
Secondary air supply system of vehicle exhaust system Download PDFInfo
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- KR100249559B1 KR100249559B1 KR1019960064668A KR19960064668A KR100249559B1 KR 100249559 B1 KR100249559 B1 KR 100249559B1 KR 1019960064668 A KR1019960064668 A KR 1019960064668A KR 19960064668 A KR19960064668 A KR 19960064668A KR 100249559 B1 KR100249559 B1 KR 100249559B1
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- air supply
- secondary air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
본 발명은 시동초기에 배기가스의 유해성분을 저감시키려는 목적에서 배기 파이프에 2차 공기를 공급하므로서, 배기가스중의 미연소된 유해 성분(HC, CO)이 저감되도록 한다. 이를 위하여, 본 발명의 2차 공기 공급장치는 시동초기에, 실린더(C1, C2, C3, C4)에 설치된 인젝터(I1, I2, I3, I4)중에서 하나를, 크랭크 포지션 센서로부터 시그널을 받는 전자제어유닛의 시그널에 의해 순차적으로 차단 하므로서, 상기 인젝터가 차단된 실린더가 에어 펌프로서 작동되어 배기 파이프(4)로 신선한 공기를 배출시키도록 한다. 이에 따라, 본 발명은 신선한 공기를 공급하기 위한 별도의 장치가 필요없이도, 엔진의 냉간시동시 유해 성분의 배기가스가 다량으로 배출되는 배기 파이프에 신선한 공기를 공급하게 된다.The present invention, by supplying secondary air to the exhaust pipe for the purpose of reducing the harmful components of the exhaust gas at the beginning of the start, the unburned harmful components (HC, CO) in the exhaust gas is reduced. To this end, the secondary air supply of the present invention at the beginning of the start, one of the injectors (I 1 , I 2 , I 3 , I 4 ) installed in the cylinder (C 1 , C 2 , C 3 , C 4 ), By sequentially blocking by the signal of the electronic control unit receiving a signal from the crank position sensor, the cylinder in which the injector is blocked is operated as an air pump to discharge fresh air into the exhaust pipe 4. Accordingly, the present invention supplies fresh air to the exhaust pipe through which a large amount of exhaust gas of harmful components is discharged during cold start of the engine without the need for a separate device for supplying fresh air.
Description
본 발명은 자동차 배기계의 2차 공기 공급장치에 관한 것으로서, 특히 시동초기(또는 냉간시동 ; cold start)의 배기가스를 감소시킬 수 있도록 하는 2차 공기 공급장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary air supply device for an automobile exhaust system, and more particularly to a secondary air supply device capable of reducing exhaust gas at an initial start (or cold start).
주지된 바와 같이, 자동차의 배기계는 엔진의 연소실에서 연소된 배기가스를 외부로 배출시키기 위해, 배기 매니폴드, 배기파이프, 촉매컨버터 및 머플러를 구비하여 이루어진다.As is well known, the exhaust system of an automobile is provided with an exhaust manifold, an exhaust pipe, a catalytic converter and a muffler to exhaust the exhaust gas combusted in the combustion chamber of the engine to the outside.
이러한 배기계에 있어서, 연소실에서 배출되는 배기가스는 인체에 무해한 수증기(H2O), 질소(N2), 탄산가스(CO2) 등도 있으나, 일산화탄소(CO), 탄화수소(HC), 질소 산화물(NOx) 등의 유독성 물질을 포함하게 된다.In such an exhaust system, the exhaust gas discharged from the combustion chamber includes water vapor (H 2 O), nitrogen (N 2), carbon dioxide (CO 2), and the like, which are harmless to humans, but carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Contains toxic substances.
종래에는 상기 배기가스의 유해성분을 제거하기 위한 방안으로서, 연소실을 비롯하여 연료, 점화, 흡, 배기 계통을 종합적으로 개량하거나 연소 상태를 제어하는 부가 장치를 설치하는 기관 개량 방식과, 희박한 혼합기를 효율적으로 연소시키기 위해 일부 짙은 혼합기를 동시에 흡입시키는 성층 급기 연소 방식과, 유해가스를 산화 또는 환원 촉매로 제거하는 촉매컨버터 방식 등이 있다.Conventionally, as a method for removing the harmful components of the exhaust gas, the engine improvement method and the lean mixer which efficiently improves the combustion, including the fuel, ignition, intake and exhaust system, or install additional equipment for controlling the combustion state, There are a stratified charge combustion method that simultaneously inhales some dark mixers for combustion, and a catalytic converter method that removes harmful gases with an oxidation or reduction catalyst.
또한, 종래 공지된 방법중에 하나로서, 배기가스에 신선한 공기를 불어넣어 CO와 HC의 함유량을 감소시킨 후, 촉매의 최대 효율을 실현하는 2차 공기 공급장치가 제안되어 있다.In addition, as one of the conventionally known methods, a secondary air supply device is proposed which realizes the maximum efficiency of the catalyst after blowing fresh air into the exhaust gas to reduce the content of CO and HC.
이러한 종래의 2차 공기 공급장치는 제1도에 잘 도시된 바와 같이, 엔진(1)의 크랭크 샤프트에서 벨트로 구동되는 에어 펌프(2)를 이용하여, 가압된 신선한 공기를 제어 밸브 및 에어 분사노즐(3)을 통해 배기 파이프(4)로 공급한다.This conventional secondary air supply uses a air pump 2 driven by a belt in the crankshaft of the engine 1, as shown in FIG. 1, to control the pressurized fresh air to control valves and air injection. It feeds into the exhaust pipe 4 through the nozzle 3.
그러나 상술한 종래 기술의 2차 공기 공급장치에 있어서는 신선한 공기를 공급하는 구조가 에어 펌프, 제어 밸브 및 분사노즐를 포함하는 복잡한 구조로 이루어지고, 부수적인 장치가 많이 소요되는 문제점이 있다.However, in the above-described secondary air supply apparatus of the prior art, the structure for supplying fresh air has a complicated structure including an air pump, a control valve, and an injection nozzle, and there is a problem in that a lot of additional devices are required.
이와 같은 종래 기술의 문제점을 해소하기 위한 것으로서, 본 발명은 2차 공기 공급장치를 간단한 구조로 실현하면서도, 시동초기 배기가스의 유해성분을 저감시킬 수 있도록 하는 목적을 갖는다.In order to solve such a problem of the prior art, the present invention has an object to reduce the harmful components of the start-up exhaust gas while realizing a secondary air supply device with a simple structure.
제1도는 일반적인 자동차의 2차 공기 공급장치를 보인 구성도.1 is a block diagram showing a secondary air supply of a typical vehicle.
제2도는 본 발명에 의한 자동차 배기계의 2차 공기 공급장치를 보인 구성도.2 is a block diagram showing a secondary air supply apparatus for an automobile exhaust system according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
C1, C2, C3, C4: 실린더 I1,I2,I3,I4: 인젝터C 1 , C 2 , C 3 , C 4 : Cylinder I 1, I 2, I 3, I 4 : Injector
1 : 엔진 4 : 배기 파이프1: engine 4: exhaust pipe
상술한 목적을 실현하기 위하여, 본 발명의 2차 공기 공급장치는 시동초기에, 크랭크 포지션 센서(CPS)부터 시그널을 받는 전자제어유닛(ECU)이 각 실린더에 설치된 하나의 인젝터로 인가되는 시그널을 순차적으로 차단하므로서, 연소되지 않는 실린더가 에어 펌프로서 작동되어 배기 파이프로 신선한 공기를 배출시키도록 구성된다.In order to realize the above object, the secondary air supply apparatus of the present invention, at the start of the start, the electronic control unit (ECU) receiving a signal from the crank position sensor (CPS) is applied to a signal applied to one injector installed in each cylinder By blocking sequentially, the non-combustion cylinder is configured to operate as an air pump to exhaust fresh air into the exhaust pipe.
또한, 상기한 ECU는 시동초기 1분 이내로 한정되어, 특히 시동초기에 인젝터를 제어하므로서, 냉간시동시 과다하게 발생되는 배기가스의 유해 성분을 저감시킨다.In addition, the ECU is limited to within one minute of the initial start-up, and in particular, by controlling the injector during the initial start-up, thereby reducing harmful components of the exhaust gas generated excessively during cold start.
이에 따라, 본 발명의 2차 공기 공급장치는 신선한 공기를 공급하기 위한 별도의 장치가 필요없이도, 엔진의 냉간시동시 유해 성분의 배기가스가 다량으로 배출되는 배기 파이프에 신선한 공기를 공급하게 된다.Accordingly, the secondary air supply apparatus of the present invention supplies fresh air to an exhaust pipe through which a large amount of exhaust gas is emitted during cold start of the engine, without a separate device for supplying fresh air.
이하, 본 발명의 이해를 돕기 위해 첨부된 도면과 더불어 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings to aid in understanding the present invention.
제2도는 본 실시예에 관련된 자동차 배기계의 2차 공기 공급장치를 보인 전체 구성도이다.2 is an overall configuration diagram showing a secondary air supply device for an automobile exhaust system according to the present embodiment.
본 실시예를 설명함에 있어, 종래 기술에서 인용된 도면과 동일한 본 실시예의 구성에 대해서는 설명의 중복을 피하기 위해 동일 부호를 부여한다.In the description of the present embodiment, the same reference numerals are given to the structures of the present embodiment that are identical to the drawings cited in the prior art in order to avoid duplication of description.
도면에서의 설명 부호 (1)은 엔진을 나타내고 있다. 엔진(1)은 4사이클로 구성되며, 4개의 실린더 (C1, C2, C3, C4)로 구성된다.Reference numeral 1 in the drawing denotes an engine. The engine 1 consists of four cycles and consists of four cylinders C 1 , C 2 , C 3 , C 4 .
또한, 각각의 실린더(C1, C2, C3, C4)에는 인젝터(I1,I2,I3,I4)가 설치된다.Injectors I 1, I 2, I 3, and I 4 are provided in the cylinders C 1 , C 2 , C 3 , and C 4 .
실린더(C1, C2, C3, C4)의 연소실로는 흡기계를 통해 신선한 공기가 유입되고, ECU에 의해 제어되는 인젝터(I1,I2,I3,I4)를 통해 연료가 분사되므로서, 혼합기를 형성한다.The combustion chamber of the cylinders C 1 , C 2 , C 3 , C 4 is supplied with fresh air through the intake machine, and fuel is injected through the injectors I 1, I 2, I 3, I 4 controlled by the ECU. Is sprayed to form a mixer.
또한, 상기 혼합기는 스파크 플러그에 의해 점화 및 폭발되고, 연소된 가스는 배기 파이프(4)를 통해 배출한다.The mixer is also ignited and exploded by the spark plug and the burned gas is discharged through the exhaust pipe 4.
여기서, 본 실시예에 의한 2차 공기 공급장치는 특히, 시동초기에 농후한 공연기에 의해 과도하게 배출되는 배기가스의 유해 성분을 저감시키기 위해, 배기 파이프(4)로 신선한 공기를 공급한다.Here, the secondary air supply apparatus according to the present embodiment supplies fresh air to the exhaust pipe 4, in particular, in order to reduce harmful components of the exhaust gas excessively discharged by the rich air conditioner at the start of the startup.
이를 위하여, 본 실시예의 2차 공기 공급장치는 시동초기에, 실린더(C1, C2, C3, C4)에 설치된 인젝터(I1,I2,I3,I4)중에서 하나를, CPS로부터 시그널을 받는 ECU의 시그널에 의해 순차적으로 차단한다.To this end, the secondary air supply of the present embodiment, at the start of the start, one of the injectors (I 1, I 2, I 3, I 4 ) installed in the cylinder (C 1 , C 2 , C 3 , C 4 ), Blocks sequentially by the signal from the ECU that receives the signal from the CPS.
예를 들어, 상기한 ECU는 시동치기 1분 동안, 제1실린더(C1)-제3실린더(C3)-제4실린더(C4)-제2실린더(C2)의 순서로 인젝터(I1,I2,I3,I4)의 시그널을 차단한다.For example, the ECU may inject the injector in the order of the first cylinder C 1 , the third cylinder C 3 , the fourth cylinder C 4 , and the second cylinder C 2 during one minute of starting. I 1, I 2, I 3, I 4 ) block the signal.
이 경우에, 상기 인젝터(I1,I2,I3,I4)가 차단된 실린더(C1, C2, C3, C4)는 연료의 공급이 차단되므로서, 에어 펌프로서 작동되어 배기 파이프(4)로 신선한 공기를 배출시킨다.In this case, the cylinders C 1 , C 2 , C 3 , C 4 , in which the injectors I 1, I 2, I 3, I 4 are blocked, are operated as air pumps because the supply of fuel is interrupted. Fresh air is exhausted to the exhaust pipe (4).
이에 따라, 본 실시예의 2차 공기 공급장치는 신선한 공기를 공급하기 위한 별도의 장치가 없이도, 엔진의 냉간시동시 유해 성분의 배기가스가 다량으로 배출되는 배기 파이프(4)로 신선한 공기를 배출하여, 미연소된 배기가스의 유해성분(HC, CO)을 저감시키며, 촉매의 배기가스 정화 효율을 향상시킨다.Accordingly, the secondary air supply device of the present embodiment discharges the fresh air to the exhaust pipe (4) in which the exhaust gas of harmful components are discharged in a large amount during cold start of the engine, without a separate device for supplying fresh air In addition, the harmful components (HC, CO) of the unburned exhaust gas are reduced, and the exhaust gas purification efficiency of the catalyst is improved.
이상에서 설명한 바와 같이, 본 발명에 의한 자동차 배기계의 2차 공기 공급 장치는 인젝터 공급되는 연료를 차단하는 간단한 방법에 의해, 배기가스를 저감 시키기 위한 2차 공기의 공급을 실현할 수 있다.As described above, the secondary air supply apparatus of the vehicle exhaust system according to the present invention can realize the supply of secondary air for reducing the exhaust gas by a simple method of blocking the fuel supplied to the injector.
또한, 본 발명에 의하면 엔진의 시동초기에 특히 다량으로 발생되는 미연소상태의 유해성분을 효과적으로 저감시킬 수 있다.In addition, according to the present invention, it is possible to effectively reduce the harmful components in the unburned state, which are generated especially in the initial stage of engine start.
이러한 효과는 촉매컨버터로 보내지는 배기가스의 유해 성분을 저감시키므로서, 촉매의 효율을 최대로 하며, 배기계를 통해 외부로 배출되는 자동차 배기가스의 최소 배출을 실현한다.This effect reduces the harmful components of the exhaust gas sent to the catalytic converter, thereby maximizing the efficiency of the catalyst and realizing the minimum emission of automobile exhaust gas discharged to the outside through the exhaust system.
한편, 본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 특허 청구의 범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능할 것이다.On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims, various modifications Would be possible.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960064668A KR100249559B1 (en) | 1996-12-12 | 1996-12-12 | Secondary air supply system of vehicle exhaust system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960064668A KR100249559B1 (en) | 1996-12-12 | 1996-12-12 | Secondary air supply system of vehicle exhaust system |
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| Publication Number | Publication Date |
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| KR19980046345A KR19980046345A (en) | 1998-09-15 |
| KR100249559B1 true KR100249559B1 (en) | 2000-04-01 |
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| KR1019960064668A Expired - Fee Related KR100249559B1 (en) | 1996-12-12 | 1996-12-12 | Secondary air supply system of vehicle exhaust system |
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