KR101091631B1 - Exhaust system - Google Patents

Exhaust system Download PDF

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KR101091631B1
KR101091631B1 KR1020090091833A KR20090091833A KR101091631B1 KR 101091631 B1 KR101091631 B1 KR 101091631B1 KR 1020090091833 A KR1020090091833 A KR 1020090091833A KR 20090091833 A KR20090091833 A KR 20090091833A KR 101091631 B1 KR101091631 B1 KR 101091631B1
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oxidation catalyst
exhaust gas
exhaust
engine
mileage
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KR1020090091833A
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KR20110034336A (en
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최성무
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현대자동차주식회사
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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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

본 발명의 실시예에 따른 배기 시스템은, 엔진에서 배출되는 배기가스가 통과하는 배기라인, 상기 배기라인에 설치되어 배기가스에 포함된 유해물질을 정화하는 산화촉매, 및 상기 엔진에 의해서 주행되는 차량의 주행거리를 감지하고, 설정된 주행거리를 주기로 상기 산화촉매의 온도를 설정된 시간 동안 설정된 온도로 유지하는 제어부를 포함한다.Exhaust system according to an embodiment of the present invention, an exhaust line through which the exhaust gas discharged from the engine passes, an oxidation catalyst installed in the exhaust line to purify harmful substances contained in the exhaust gas, and a vehicle driven by the engine And a control unit for sensing a driving distance of the vehicle and maintaining the temperature of the oxidation catalyst at a set temperature for a predetermined time period at a set driving distance.

따라서, 최적으로 설정된 주행거리를 주기로 설정온도로 설정된 시간 동안 유지시킴으로써, 상기 산화촉매의 정화율이 저하되는 것을 늦출 수 있고, 단순하게 주행거리를 주기로 탈황재생모드가 수행되므로, 복잡한 제어로직 또는 제어요소가 필요하지 않다.Therefore, by maintaining the optimally set mileage for a period of time set at the set temperature, it is possible to delay the deterioration of the purification rate of the oxidation catalyst, and the desulfurization regeneration mode is carried out simply by giving the mileage, so that complicated control logic or control No element is required.

산화촉매, DOC, 배기가스, 재생주기 Oxidation Catalyst, DOC, Exhaust Gas, Regeneration Cycle

Description

배기 시스템{EXHAUST SYSTEM}Exhaust system {EXHAUST SYSTEM}

본 발명은 배기 시스템에 관한 것으로서, 보다 상세하게는 배기가스에 포함된 유해물질을 정화하는 배기 시스템에 관한 것이다.The present invention relates to an exhaust system, and more particularly to an exhaust system for purifying harmful substances contained in the exhaust gas.

일반적으로 엔진에서 배기 매니폴드를 통해 배출되는 배기가스는 배기 파이프의 도중에 형성된 촉매장치(Catalytic converter)로 유도되어 정화되고, 머플러를 통과하면서 소음이 감쇄된 후 테일 파이프를 통해 대기 중으로 방출된다.In general, the exhaust gas discharged from the engine through the exhaust manifold is guided and purified by a catalytic converter formed in the middle of the exhaust pipe, and the noise is attenuated while passing through the muffler and then released into the atmosphere through the tail pipe.

배기라인에 설치된 산화촉매는 배기가스에 포함된 유해물질을 화학적으로 변환시키고, 여과필터는 배기 파이프 상에는 배기가스에 포함된 입자상 물질(PM)을 포집한다.The oxidation catalyst installed in the exhaust line chemically converts harmful substances contained in the exhaust gas, and the filtration filter collects particulate matter (PM) contained in the exhaust gas on the exhaust pipe.

한편, 산화촉매는 배기가스에 포함된 탄화수소와 일산화탄소를 정화하는 것으로써, 특히 디젤연료중의 황성분은 상기 산화촉매의 성능을 저하시키는 문제점이 있다.On the other hand, the oxidation catalyst is to purify the hydrocarbons and carbon monoxide contained in the exhaust gas, in particular the sulfur component in diesel fuel has a problem of lowering the performance of the oxidation catalyst.

따라서, 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 창출된 것으 로, 본 발명의 목적은 황성분으로 오염된 산화촉매를 효율적으로 재생하는 배기 시스템을 제공하는 것이다. Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an exhaust system for efficiently regenerating an oxidation catalyst contaminated with sulfur.

이러한 목적을 달성하기 위한 본 발명의 실시예에 따른 배기 시스템은, 엔진에서 배출되는 배기가스가 통과하는 배기라인, 상기 배기라인에 설치되어 배기가스에 포함된 유해물질을 정화하는 산화촉매, 및 상기 엔진에 의해서 주행되는 차량의 주행거리를 감지하고, 설정된 주행거리를 주기로 상기 산화촉매의 온도를 설정된 시간 동안 설정된 온도로 유지하는 제어부를 포함한다.Exhaust system according to an embodiment of the present invention for achieving this object, an exhaust line through which the exhaust gas discharged from the engine passes, an oxidation catalyst installed in the exhaust line to purify the harmful substances contained in the exhaust gas, and the And a controller configured to sense a driving distance of the vehicle driven by the engine and to maintain the temperature of the oxidation catalyst at a set temperature for a predetermined time at a set driving distance.

상기 설정된 주행거리는 최대 15000km 이고, 상기 설정된 온도는 섭씨 450도 이상이며, 상기 설정된 시간은 5분이상이다.The set mileage is at most 15000km, the set temperature is at least 450 degrees Celsius, and the set time is at least 5 minutes.

상기 산화촉매는 배기가스에 포함된 일산화탄소와 탄화수소를 이산화탄소와 물로 변화시키되, 상기 제어부는 상기 산화촉매에 부착된 황성분을 제거하여 그 정화효율을 주기적으로 향상시킨다.The oxidation catalyst converts carbon monoxide and hydrocarbons contained in exhaust gas into carbon dioxide and water, and the control unit periodically removes sulfur components attached to the oxidation catalyst to improve its purification efficiency.

상기 산화촉매는 Pt 또는 Pd 를 포함하는 촉매물질을 포함하고, 상기 제어부는 상기 촉매물질에 부착된 황성분을 주기적으로 제거한다.The oxidation catalyst includes a catalyst material including Pt or Pd, and the controller periodically removes sulfur components attached to the catalyst material.

상기 제어부는 탈황모드를 적용하여 상기 산화촉매에 부착된 황성분을 제거하고, 상기 산화촉매의 정화효율은, 복원되는 복원율과 복원되지 않는 비복원율을 포함하며, 상기 설정된 주행거리는, 정화효율의 상기 비복원율이 최소인 상태에서 그 주행거리가 가장 긴 수치로 결정된다.The control unit applies a desulfurization mode to remove sulfur components attached to the oxidation catalyst, and the purification efficiency of the oxidation catalyst includes a recovery rate to be restored and a non-reconstruction rate to be restored, and the set mileage is the ratio of the purification efficiency. With the minimum recovery rate, the mileage is determined to be the longest.

상기 제어부는 탈황모드를 적용하기 위해서, 상기 산화촉매 전단부에 구비된 후분사인젝터에서 연료를 추가분사하거나, 상기 엔진에 구비된 엔진인젝터에서 연료를 추가로 분사한다.In order to apply the desulfurization mode, the control unit additionally injects fuel from the post injection injector provided at the front end of the oxidation catalyst, or additionally injects fuel from the engine injector provided in the engine.

상술한 바와 같이 본 발명에 따르면, 최적으로 설정된 주행거리를 주기로 설정온도로 설정된 시간 동안 유지시킴으로써, 상기 산화촉매의 정화율이 저하되는 것을 늦출 수 있다.As described above, according to the present invention, it is possible to delay the deterioration of the purification rate of the oxidation catalyst by maintaining the optimally set driving distance for a period of time set at the set temperature.

아울러, 단순하게 주행거리를 주기로 탈황재생모드가 수행되므로, 복잡한 제어로직이나 제어요소가 필요하지 않다.In addition, since the desulfurization regeneration mode is performed simply by giving a mileage, no complicated control logic or control element is required.

이하, 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세하게 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 배기 시스템에 구비되는 산화촉매의 개략적인 개념도이다.1 is a schematic conceptual diagram of an oxidation catalyst provided in an exhaust system according to an embodiment of the present invention.

도 1을 참조하면, 자동차의 엔진에서 발생되는 배기가스에는 일산화탄소(CO), 탄화수소(HC), 입자상물질(PM: particulate matters), 및 질소산화물(NOx)을 포함되어 있다.Referring to FIG. 1, the exhaust gas generated from the engine of an automobile includes carbon monoxide (CO), hydrocarbons (HC), particulate matters (PM), and nitrogen oxides (NOx).

상기 배기가스가 통과하는 배기라인에는 산화촉매(DOC: diesel oxidation catalyst)가 설치되고, 상기 산화촉매는 배기가스에 포함된 일산화탄소(CO)와 탄화수소(HC)를 산화환원반응을 이용하여 이산화탄소(CO2)와 수분(H2O)으로 전환시킨다.A diesel oxidation catalyst (DOC) is installed in an exhaust line through which the exhaust gas passes, and the oxidation catalyst is a carbon dioxide (CO2) gas through a redox reaction of carbon monoxide (CO) and hydrocarbons (HC) included in the exhaust gas. ) And moisture (H2O).

도 2는 본 발명의 실시예에 따른 산화촉매의 정화특성을 보여주는 그래프이다.2 is a graph showing the purification characteristics of the oxidation catalyst according to an embodiment of the present invention.

도 2를 참조하면, 가로축은 차량의 운행거리를 나타내고, 세로축은 상기 산화촉매의 LOT를 나타낸다. 2, the horizontal axis represents the travel distance of the vehicle, and the vertical axis represents the LOT of the oxidation catalyst.

여기서, LOT는 "light of temperature"의 약자로써, 상기 산화촉매가 정상적으로 작동되는 온도를 나타낸다. Here, LOT stands for "light of temperature" and represents the temperature at which the oxidation catalyst operates normally.

즉, LOT는 상기 산화촉매를 통과하는 배기가스에 포함된 유해물질의 정화율이 설정된 수치에 이른 온도를 나타낸다.That is, LOT represents a temperature at which the purification rate of the harmful substance contained in the exhaust gas passing through the oxidation catalyst reaches a set value.

도시한 바와 같이, 탄화수소에 대한 상기 산화촉매의 LOT는 운행거리가 0km인 경우, 섭씨 약 230도이고, 운행거리가 40000km 인 경우, 섭씨 약 260도이다. As shown, the LOT of the oxidation catalyst for hydrocarbon is about 230 degrees Celsius when the driving distance is 0km, and about 260 degrees Celsius when the driving distance is 40000km.

아울러, 일산화탄소에 대한 상기 산화촉매의 LOT는 운행거리가 0km인 경우, 섭씨 약 180도이고, 운행거리가 40000km 인 경우, 섭씨 약 250도이다.In addition, the LOT of the oxidation catalyst for carbon monoxide is about 180 degrees Celsius when the operating distance is 0km, and about 250 degrees Celsius when the operating distance is 40000km.

차량의 운행거리가 길어질수록, 상기 산화촉매의 LOT가 증가하여, 정화효율이 감소하게 되는데, 이 감소이유는 열에너지에 의한 촉매의 열화와 배기가스에 포함된 황에 의한 촉매의 오염이다.As the vehicle travels longer, the LOT of the oxidation catalyst increases and the purification efficiency decreases. This reduction is caused by degradation of the catalyst by thermal energy and contamination of the catalyst by sulfur contained in the exhaust gas.

도 3은 본 발명의 실시예에 따른 산화촉매가 황에 오염되는 메커니즘을 보여준다.3 shows a mechanism in which an oxidation catalyst is contaminated with sulfur according to an embodiment of the present invention.

도 3을 참조하면, 상기 산화촉매(DOC)에는 촉매성분으로써 Pt/Pd 성분이 코팅된다.Referring to Figure 3, the oxidation catalyst (DOC) is coated with a Pt / Pd component as a catalyst component.

자동차의 원료로 사용되는 가솔린이나 디젤에는 미량의 황(S: sulfate) 성분 이 포함되어 있으며, 연소 후에는 이산화황의 형태로 배기가스에 포함되어 상기 산화촉매를 통과하게 된다. Gasoline or diesel, which is used as a raw material for automobiles, contains a trace amount of sulfur (S: sulfate), and after combustion, it is included in exhaust gas in the form of sulfur dioxide and passes through the oxidation catalyst.

여기서, 이산화황이 상기 산화촉매의 촉매성분에 부착되어 그 황성분이 그 촉매의 정화기능을 저하시킨다. 상기 산화촉매에 부착된 황은 낮은 온도에서 부착되고, 높은 온도에서 탈착되는 특징을 갖는다.Here, sulfur dioxide adheres to the catalyst component of the oxidation catalyst so that the sulfur component lowers the purification function of the catalyst. Sulfur attached to the oxidation catalyst is characterized by being attached at a low temperature, and desorbed at a high temperature.

도 4는 본 발명의 실시예에 따른 산화촉매의 재생시 비복원특성을 보여주는 그래프이다.4 is a graph showing non-restored characteristics during regeneration of an oxidation catalyst according to an embodiment of the present invention.

도 4를 참조하면, 가로축은 주행거리를 나타내고, 세로축은 일산화탄소의 배출양을 나타낸다. 여기서, 0.5g/km은 EU-4의 상한선이다.Referring to FIG. 4, the horizontal axis represents the travel distance, and the vertical axis represents the emission amount of carbon monoxide. Here, 0.5 g / km is the upper limit of EU-4.

도시한 바와 같이, 주행거리가 길어질수록, 배출되는 일산화탄소의 양이 0.15에서 0.41로 증가하고, 상기 산화촉매를 재생시킴으로써 그 양이 0.217로 줄어든다.As shown, as the mileage increases, the amount of carbon monoxide emitted increases from 0.15 to 0.41, and the amount decreases to 0.217 by regenerating the oxidation catalyst.

재생이 완료되더라도 초기 일산화탄소의 배출량 즉, 0.15로 복귀되지 않는다. 즉, 0.217과 0.15사이에 0.067의 차이가 나고, 여기서, 0.067은 비복원양(NRA: none return amount)이다.Regeneration does not return to the initial carbon monoxide emissions of 0.15. That is, there is a difference of 0.067 between 0.217 and 0.15, where 0.067 is a none return amount (NRA).

따라서, 상기 비복원양(NRA)를 최소화시켜야 재생효율이 극대화되고, 그 내구성이 향상될 수 있다.Therefore, the recovery efficiency is maximized when the non-restored amount (NRA) is minimized, and durability thereof may be improved.

도 5는 본 발명의 실시예에 따른 산화촉매의 재생의 필요성을 보여주는 그래프이다.5 is a graph showing the necessity of regeneration of an oxidation catalyst according to an embodiment of the present invention.

도 5를 참조하면, 가로축은 배기가스에 포함된 오염물질의 종류와 주행거리 를 나타내고, 세로축은 그 오염물질의 배출량을 나타낸다.Referring to FIG. 5, the horizontal axis represents the type of pollutant contained in the exhaust gas and the travel distance, and the vertical axis represents the emission amount of the pollutant.

40000km, 60000km, 80000km, 및 100000km로 주행거리가 증가함에 따라서, 일산화탄소의 배출량은 각각 0.339, 0.401, 0.488, 및 0.609에 이른다. 여기서, 약 80000km 지점에서 제한선(EU-limit)에 도달하므로 그 전에 상기 산화촉매의 재생이 수행되어야 한다.As mileage increases to 40000 km, 60000 km, 80000 km, and 100000 km, carbon monoxide emissions reach 0.339, 0.401, 0.488, and 0.609, respectively. Here, the EU-limit is reached at a point of about 80000 km, so the regeneration of the oxidation catalyst must be performed before that.

도 6은 본 발명의 실시예에 따른 산화촉매의 재생특성을 나타내는 그래프이다.6 is a graph showing the regeneration characteristics of the oxidation catalyst according to an embodiment of the present invention.

도 6에서 가로축은 상기 산화촉매의 온도를 나타내고, 세로축은 탄화수소의 정화율(conversion rate)를 나타낸다.In FIG. 6, the horizontal axis represents the temperature of the oxidation catalyst, and the vertical axis represents the conversion rate of hydrocarbons.

도 6을 참조하면, 라인A는 35000km를 주행한 상태의 상기 산화촉매의 상태를 나타내고, 라인B는 35000km를 주행한 상태의 상기 산화촉매에 탈황모드를 적용한 상태를 나타내고, 라인C는 기준이되는 산화촉매의 상태를 나타낸다.Referring to FIG. 6, line A represents a state of the oxidation catalyst while driving 35000 km, line B represents a state in which a desulfurization mode is applied to the oxidation catalyst while driving 35000 km, and line C is a reference. The state of the oxidation catalyst is shown.

예를 들어, 탄화수소에 대한 상기 산화촉매의 정화율이 60퍼센트에 이르는 온도를 LOT라고 한다면, LOT는 약 250도에서 210도로 하강하지만, 기준 산화촉매의 LOT인 약 190도로는 복구되지 않는다.For example, if the purification rate of the oxidation catalyst for hydrocarbons reaches 60 percent, LOT, the LOT drops from about 250 degrees to 210 degrees, but is not restored to about 190 degrees, the LOT of the reference oxidation catalyst.

여기서, 250도에서 210도로 복원되는 부분은 복원율로 정하고, 210에서 190으로 복원되지 않는 부분은 비복원률로 정한다면, 상기 복원율은 크고 상기 비복원율은 작은 것이 바람직하다.Here, if the portion restored to 250 degrees to 210 degrees is determined by the recovery rate, and the portion not restored to 210 to 190 is set as the non-restore rate, the recovery rate is preferably large and the non-restore rate is small.

전술한 바와 같이, 상기 산화촉매가 35000km로 재생되는 경우, 비복원율이 커져 재생효율이 점차 감소되는 문제점이 있다.As described above, when the oxidation catalyst is regenerated at 35000 km, there is a problem in that the regeneration efficiency is gradually decreased due to a large recovery rate.

그러나, 본 발명의 실시예에서는 최대 15000km 주기로 상기 산화촉매를 재생함으로써, 상기 비복원률은 거의 0에 가까워지고, 상기 복원률은 상대적으로 커진다. 따라서, 상기 산화촉매의 정화효율의 감소가 늦춰지는 효과가 있다.However, in the embodiment of the present invention, by regenerating the oxidation catalyst at a maximum of 15000 km, the specific recovery rate is almost zero, and the recovery rate is relatively large. Therefore, there is an effect that the decrease in the purification efficiency of the oxidation catalyst is delayed.

본 발명의 실시예에서, 상기 산화촉매의 비복원률이 작은 주행거리가 0 내지 15000km라면, 그 범위 내에서 가장 최대값 15000km를 주기로 상기 산화촉매를 재생한다. 특히, 15000km가 넘으면 비복원율이 커지므로 그 재생효율이 감소할 수 있다.In an embodiment of the present invention, if the mileage of the oxidation catalyst having a small recovery rate is 0 to 15000 km, the oxidation catalyst is regenerated at a maximum value of 15000 km within the range. In particular, the regeneration efficiency may decrease because the non-recovery rate is greater than 15000km.

너무 자주 재생 하게되면, 열에 의한 상기 산화촉매의 정화율이 저하되고 연료 소비가 늘어나는 단점이 있으므로, 비복원률이 작은 영역에서 최대 주행거리를 재생주기로 한다.If the regeneration is performed too frequently, there is a disadvantage in that the purification rate of the oxidation catalyst due to heat is lowered and fuel consumption is increased. Therefore, the maximum driving distance is set in the regeneration cycle in a region having a low non-recovery rate.

본 발명의 실시예에서, 상기 산화촉매를 재생하기 위해서, 상기 산화촉매의 온도를 섭씨 450도 이상으로 5분 이상 유지하는 것이 바람직하다.In an embodiment of the present invention, in order to regenerate the oxidation catalyst, it is preferable to maintain the temperature of the oxidation catalyst at 450 degrees Celsius or more for 5 minutes or more.

제어부(미도시)는 전후단에 배치된 온도센서를 통해서 상기 산화촉매의 온도를 감지하고, 온도제어는 엔진에 부착된 엔진인젝터나 배기라인에 설치된 후분사인젝터를 통해서 연료를 추가로 분사함으로써 제어한다.The controller (not shown) detects the temperature of the oxidation catalyst through a temperature sensor disposed at the front and rear ends, and the temperature control is controlled by additionally injecting fuel through an engine injector attached to the engine or a post injection injector installed in the exhaust line. do.

이상으로 본 발명에 관한 바람직한 실시예를 설명하였으나, 본 발명은 상기 실시예에 한정되지 아니하며, 본 발명의 실시예로부터 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의한 용이하게 변경되어 균등하다고 인정되는 범위의 모든 변경을 포함한다.While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

도 1은 본 발명의 실시예에 따른 배기 시스템에 구비되는 산화촉매의 개략적인 개념도이다.1 is a schematic conceptual diagram of an oxidation catalyst provided in an exhaust system according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 산화촉매의 정화특성을 보여주는 그래프이다.2 is a graph showing the purification characteristics of the oxidation catalyst according to an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 산화촉매이 황에 오염되는 메커니즘을 보여준다.3 shows a mechanism in which an oxidation catalyst is contaminated with sulfur according to an embodiment of the present invention.

도 4는 본 발명의 실시예에 따른 산화촉매의 재생시 비복원특성을 보여주는 그래프이다.4 is a graph showing non-restored characteristics during regeneration of an oxidation catalyst according to an embodiment of the present invention.

도 5는 본 발명의 실시예에 따른 산화촉매의 재생의 필요성을 보여주는 그래프이다.5 is a graph showing the necessity of regeneration of an oxidation catalyst according to an embodiment of the present invention.

도 6은 본 발명의 실시예에 따른 산화촉매의 재생특성을 나타내는 그래프이다.6 is a graph showing the regeneration characteristics of the oxidation catalyst according to an embodiment of the present invention.

Claims (4)

엔진에서 배출되는 배기가스가 통과하는 배기라인;An exhaust line through which exhaust gas discharged from the engine passes; 상기 배기라인에 설치되어 배기가스에 포함된 유해물질을 정화하는 산화촉매; 및An oxidation catalyst installed in the exhaust line to purify harmful substances contained in the exhaust gas; And 차량의 주행거리를 감지하고, 설정된 주행거리를 주기로 상기 산화촉매의 온도를 설정된 시간 동안 설정된 온도로 유지하는 제어부; 를 포함하고, A control unit which senses a driving distance of the vehicle and maintains the temperature of the oxidation catalyst at a set temperature for a set time at a set driving distance; Including, 상기 산화촉매는 Pt 또는 Pd 를 포함하는 촉매물질을 포함하고, 상기 제어부는 상기 촉매물질에 부착된 황성분을 주기적으로 제거하는 탈황모드를 수행하며, The oxidation catalyst includes a catalyst material including Pt or Pd, and the control unit performs a desulfurization mode to periodically remove sulfur components attached to the catalyst material, 상기 산화촉매의 정화효율은, Purification efficiency of the oxidation catalyst, 복원되는 복원율과 복원되지 않는 비복원율을 포함하며, Includes the restore rate that is restored and the non-restore rate that is not restored, 상기 설정된 주행거리는, The set mileage is, 상기 비복원율이 최소인 상태에서 그 주행거리가 가장 긴 수치로 결정되는 것을 특징으로 하는 배기 시스템.The exhaust system, characterized in that the mileage is determined to the longest value in the state that the non-return rate is minimum. 삭제delete 삭제delete 제1 항에 있어서,The method according to claim 1, 상기 제어부는 탈황모드를 적용하기 위해서, 상기 산화촉매 전단부에 구비된 후분사인젝터에서 연료를 추가분사하거나, 상기 엔진에 구비된 엔진인젝터에서 연료를 추가로 분사하는 것을 특징으로 하는 배기 시스템.In order to apply the desulfurization mode, the control unit further injects fuel from a post injection injector provided at the front end of the oxidation catalyst, or further injects fuel from an engine injector provided in the engine.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100756622B1 (en) * 2006-08-29 2007-09-10 쌍용자동차 주식회사 Model logic of catalyst sulfation for diesel automobile

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