KR20090127734A - System for purifying exhaust gas of vehicle and control method thereof - Google Patents

System for purifying exhaust gas of vehicle and control method thereof Download PDF

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KR20090127734A
KR20090127734A KR1020080053838A KR20080053838A KR20090127734A KR 20090127734 A KR20090127734 A KR 20090127734A KR 1020080053838 A KR1020080053838 A KR 1020080053838A KR 20080053838 A KR20080053838 A KR 20080053838A KR 20090127734 A KR20090127734 A KR 20090127734A
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temperature
thc
catalyst
fuel ratio
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KR100986071B1 (en
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최무영
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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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • 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
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PURPOSE: An exhaust gas purification device of a vehicle and a control method thereof are provided to control an air fuel ratio when UCC is included in a domain of a bed temperature and to increase purifying efficiency. CONSTITUTION: An exhaust gas purification device of a vehicle comprises an UCC(300), a temperature sensor(500) and a controller(600). The UCC comprises a first catalyst and a second catalyst. The first catalyst adsorbs THC created in the cold driving. The second catalyst purifies THC by oxidizing with THC. The UCC is installed in an exhaust pipe. The temperature sensor is installed in the downstream side of the UCC. The controller analyzes information of the temperature sensor and controls the air fuel ratio if the UCC is in a condition of a bed temperature. The controller returns the air-fuel ratio when the UCC reaches an active temperature.

Description

차량의 배기가스 정화장치 및 제어방법{System for purifying exhaust gas of vehicle and control method thereof}System for purifying exhaust gas of vehicle and control method

본 발명은 차량의 배기가스 정화장치에 관한 것으로, 상세하게는 UCC(Under floor Catalytic Converter)의 후방 온도에 따른 엔진 제어로 THC(탄화수소)의 배출을 최소화하고, 배기가스의 정화 능력을 향상시키는 차량의 배기가스 정화장치 및 제어방법에 관한 것이다.The present invention relates to a vehicle exhaust gas purification apparatus, and in particular, a vehicle that minimizes the emission of THC (hydrocarbon) and improves the exhaust gas purification ability by controlling the engine according to the rear temperature of the under floor catalytic converter (UCC). It relates to an exhaust gas purification apparatus and a control method of the.

현재 세계적으로 배기 환경 문제가 크게 대두되고 있으며, 이에 따라 차량의 배출규제는 점점 강화되고 있다.At present, there is a great deal of exhaust environmental problems around the world, and accordingly, emission control of vehicles is being tightened.

미국 캘리포니아의 자동차에 대한 환경규제가 ULEV II에서 SULEV(Super Ultra Law Emission Vehicle)로 규제가 진행되면서 THC, CO, NOx의 배출규제가 더욱 엄격해지고 있으며, THC의 경우 FTP-75 모드 운전시 0.055g/mile 수준에서 0.01g/mile로 규제수준이 강화되었다.As environmental regulations for automobiles in California are regulated from ULEV II to SULEV (Super Ultra Law Emission Vehicle), emission regulations of THC, CO and NOx are becoming more stringent, and THC is 0.055g when operating in FTP-75 mode. The regulatory level has been tightened to 0.01 g / mile from the / mile level.

따라서, 차량에는 상기한 배출규제를 만족시키기 위하여 다각적인 연구가 진행되고 있으며, 이를 위한 방법으로 배기 파이프의 소정위치에 배기가스를 정화시키는 촉매장치를 설치하고 있다. Accordingly, various studies have been conducted to satisfy the above emission regulations, and a catalyst device for purifying exhaust gas at a predetermined position of the exhaust pipe is installed as a method for the vehicle.

가솔린 엔진 차량에서 상기의 배출규제를 만족시키기 위해서는 대략적으로 두 가지 방법이 있다.There are roughly two ways to meet the above emission limits in gasoline engine vehicles.

첫째는 엔진에서 배출되는 THC의 량을 줄이는 것이며, 둘째는 촉매의 성능을 강화하여 엔진에서 나오는 유해 가스의 정화능력을 상승시키는 것이다.The first is to reduce the amount of THC emitted from the engine, and the second is to enhance the catalyst's performance to increase the ability to purify harmful gases from the engine.

그런데, 촉매장치는 일반적으로 350℃ 이후에서 활성화되어 정화기능이 시작되는데 상온 시동의 경우 촉매장치가 활성화 온도(LOT)에 이르기 전에 배출되는 THC는 촉매장치에서 정화되지 못하고 대기로 배출된다.However, the catalyst device is generally activated after 350 ° C. and the purification function is started. In the case of normal temperature startup, the THC discharged before the catalyst device reaches the activation temperature LOT is discharged to the atmosphere without being purified from the catalyst device.

이것을 해결하기 위해서는 엔진에서 배출되는 에너지량 및 배기계 레이아웃을 최적화하여 활성화 온도에 도달하는 시간을 최소화시켜야 하나, 레이아웃의 문제 및 촉매장치의 원가상승 문제가 수반된다.In order to solve this problem, the amount of energy emitted from the engine and the layout of the exhaust system should be optimized to minimize the time to reach the activation temperature, but the problem of layout and cost increase of the catalytic device is accompanied.

따라서, 촉매장치에 THC를 흡착시키는 촉매를 적용하고 있으며, THC를 흡착시키는 촉매 물질로 제올라이트(Zeolite)가 사용된다.Therefore, a catalyst for adsorbing THC is applied to a catalyst device, and zeolite is used as a catalyst material for adsorbing THC.

도 1은 차량에 장착되는 촉매장치의 단면 구조 및 THC의 흡착 원리를 도시한 도면이다.1 is a view showing a cross-sectional structure of the catalyst device mounted on the vehicle and the adsorption principle of THC.

촉매장치는 담체의 표면(1)에 저온에서 THC를 흡착시키고 고온에서 흡착된 THC를 탈착시키는 제올라이트(2)를 적층하고, 제올라이트(2)의 상부에 Pt/Rh, Pd/Rh 혹은 Pt/Pd/Rh가 적층되어 CO, NOx, 탄화수소계 화합물과 산화/환원 반응하는 삼원촉매(3)가 적층된다.The catalyst device stacks zeolites 2 which adsorb THC at low temperature and desorbs THC adsorbed at high temperature on the surface 1 of the carrier, and Pt / Rh, Pd / Rh or Pt / Pd on top of the zeolite 2. / Rh is laminated to form a three-way catalyst 3 for oxidation / reduction reaction with CO, NOx and hydrocarbon compounds.

상기한 구조를 작는 촉매장치는 엔진의 시동 온 이후 삼원촉매가 활성화되기 이전, 즉 삼원촉매가 상온을 유지하는 상태에서 배출되는 THC는 (A)와 같이 제올라 이트 층(2)에 흡착되어 대기로 배출되는 양이 최소화되도록 정화한다.In the catalyst apparatus having the above structure, the THC discharged after the three-way catalyst is activated after the engine is turned on, that is, while the three-way catalyst is maintained at room temperature, is adsorbed to the zeolite layer 2 as shown in (A). Purify to minimize the amount of gas emitted.

이후, 시간이 경과함에 따라 배출가스의 온도 혹은 별도로 삽입되는 히터에 의해 촉매장치가 가열되어 고온으로 형성되면 (B)와 같이 제올라이트(2)에 흡착된 THC의 탈착이 발생되는데, 삼원촉매(3)가 베드온도, 대략적으로 150℃를 유지하는 정상 활성화 이전의 영역인 경우 제올라이트(2)에서 탈착되는 THC를 정화시키지 못하여 그대로 배출시킨다.Subsequently, when the catalyst device is heated and formed at a high temperature by the temperature of the exhaust gas or a heater inserted separately, desorption of THC adsorbed on the zeolite 2 occurs as shown in (B). ) Is the area before normal activation, which maintains the bed temperature, approximately 150 ° C., does not purify the THC desorbed from the zeolite 2 and is discharged as it is.

이후, 시간의 경과에 따라 삼원촉매(3)가 활성화 온도, 대략 350℃에 도달하게 되면 (C)와 같이 제올라이트층(2)에서 탈착된 THC는 삼원촉매(3)의 물질과 산화 반응하여 H2O 혹은 CO2로 정화된다.Then, when the three-way catalyst (3) reaches the activation temperature, approximately 350 ℃ over time, THC desorbed in the zeolite layer (2) as shown in (C) is oxidized with the material of the three-way catalyst (3) H2O Or purified with CO2.

상기와 같이 촉매장치에 흡착되었던 THC가 탈착되면 도 2에 도시된 바와 같이 공연비는 실제 엔진에서 구성되는 공연비 보다 농후하게 배출이 된다.When the THC adsorbed on the catalyst device is desorbed as described above, as shown in FIG. 2, the air-fuel ratio is discharged more richly than the air-fuel ratio configured in the actual engine.

그러나, 공연비가 농후하게 배출되면 THC가 산화되어 CO2로 정화되기 위한 산소의 양이 부족하므로 촉매장치가 활성화되는 온도 조건이 되어도 정화 성능이 떨어지는 문제점이 발생한다.However, when the air-fuel ratio is discharged in abundance, the amount of oxygen for oxidizing the THC and purifying CO2 is insufficient, so that the purification performance is deteriorated even when the catalytic apparatus is activated.

따라서 제올라이트에 흡착된 THC의 탈착 구간에서 엔진의 공연비를 희박 조건으로 운전하여 산소의 량을 확보하는 제어가 필요하다. Therefore, it is necessary to control the amount of oxygen by operating the air-fuel ratio of the engine in lean conditions in the desorption section of the THC adsorbed to the zeolite.

제올라이트는 Si와 Al로 이루어진 다공성 물질로, 특성적으로 고온과 물의 조건에서 제올라이트의 Al 성분이 구조적으로 붕괴가 되어 흡착 성능이 크게 저하된다. Zeolite is a porous material composed of Si and Al, and characteristically, the Al component of the zeolite is structurally collapsed under high temperature and water conditions, so that the adsorption performance is greatly reduced.

제올라이트를 THC 흡착촉매로 적용시하는 경우 통상적으로 내구적인 측면을 고려하여 상대적으로 저온 분위기인 UCC에 적용하고 있다.When the zeolite is applied as a THC adsorption catalyst, it is generally applied to a UCC which is a relatively low temperature atmosphere in consideration of durability.

현재의 차량에서는 UCC에 적용되는 THC 흡착촉매의 정화효율을 향상시키고자 하는 엔진 제어방법이 제시되어 있지 않다.In the current vehicle, no engine control method is proposed to improve the purification efficiency of the THC adsorption catalyst applied to the UCC.

따라서, 저온 시동의 초기에는 제올라이트에서 THC를 충분하게 흡착시키나 삼원촉매의 활성화가 이루어지지 않은 베드온도의 조건에서 탈착되는 THC의 정화가 이루어지지 않고 대기로 배출되어 에미션을 악화시키는 문제점이 발생된다.Therefore, in the early stage of low temperature startup, the zeolite is sufficiently adsorbed with THC, but the THC, which is desorbed under the bed temperature condition in which the three-way catalyst is not activated, is discharged to the atmosphere without deterioration of the emission. .

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 THC의 정화를 위한 촉매로 제올라이트가 적층되는 UCC의 하류측에 온도센서를 장착하여 UCC의 활성화 온도 도달여부를 판정하고, UCC가 베드온도의 영역에 포함되면 공연비를 희박하게 제어하여 배출가스에 충분한 산소량이 공급되도록 함으로서, 삼원촉매에 의해 탈착되는 THC의 안정된 정화효율이 확보되도록 하는 것이다.The present invention has been invented to solve the above problems, the object of the present invention is to determine whether the UCC activation temperature is reached by mounting a temperature sensor on the downstream side of the UCC in which the zeolite is deposited as a catalyst for the purification of THC, When included in the bed temperature range, by controlling the air-fuel ratio sparingly to supply a sufficient amount of oxygen to the exhaust gas, it is to ensure a stable purification efficiency of the THC desorbed by the three-way catalyst.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 차량의 배기가스 정화장치는, 냉간 운전에서 발생되는 THC를 흡착시키는 제1촉매와 제1촉매에서 탈착되는 THC와 산화 반응하는 정화시키는 제2촉매가 하나의 담체에 구성되어 배기 파이프에 장착되는 UCC; 상기 UCC의 하류측에 설치되어 UCC의 온도를 검출하는 온도센서; 상기 온도센서의 정보를 분석하여 UCC가 베드 온도의 조건이면 공연비를 희박하게 제어하고, 활성화 온도를 도달되면 이론 공연비로 복귀시키는 제어부를 포함 한다.An exhaust gas purifying apparatus for a vehicle according to a feature of the present invention for realizing the above object includes a first catalyst for adsorbing THC generated in cold operation and a second catalyst for oxidizing and reacting with THC desorbed from the first catalyst. UCC is configured in one carrier and mounted to the exhaust pipe; A temperature sensor installed at a downstream side of the UCC to detect a temperature of the UCC; And analyzing the information of the temperature sensor to control the air-fuel ratio lean if the UCC is a condition of the bed temperature, and returns to the theoretical air-fuel ratio when the activation temperature is reached.

또한, 본 발명의 특징에 따른 차량의 배기가스 정화장치 제어방법은, 냉간 상태에서 엔진 시동 온이 검출되면 UCC의 온도를 측정하여 제1기준온도에 도달하였는지 판단하는 과정; UCC의 온도가 제1기준온도에 도달되었으면 공연비를 희박 연소로 제어하는 과정; 시간의 경과에 따라 UCC의 온도가 제2기준온도에 도달되면 이론 공연비의 연소를 제어하는 과정을 포함한다.In addition, the method for controlling the exhaust gas purifying apparatus of a vehicle according to an aspect of the present invention may include: determining whether the first reference temperature is reached by measuring a temperature of the UCC when an engine start-up is detected in a cold state; If the temperature of the UCC reaches the first reference temperature, controlling the air-fuel ratio to lean combustion; And controlling the combustion of the theoretical air-fuel ratio when the temperature of the UCC reaches the second reference temperature over time.

전술한 구성에 의하여 본 발명은 전체 운전 영역에서 THC를 안정되게 제거함으로써, 에미션을 향상시키는 효과가 기대된다.According to the above configuration, the present invention is expected to stably remove THC in the entire operating region, thereby improving the emission effect.

아래에서는 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

본 발명은 여러 가지 상이한 형태로 구현될 수 있으므로 여기에서 설명하는 실시예에 한정되지 않으며, 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였다.Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

도 3은 본 발명의 실시예에 따른 차량의 배기가스 정화장치를 개략적으로 도시한 도면이다.3 is a view schematically showing an exhaust gas purification apparatus of a vehicle according to an embodiment of the present invention.

본 발명은 엔진(100)에 근접하게 삼원촉매(200)가 장착되고, 상기 삼원촉매(200)와 연결되는 배기 파이프의 소정 위치에 UCC(300)가 장착된다.In the present invention, the three-way catalyst 200 is mounted close to the engine 100, and the UCC 300 is mounted at a predetermined position of the exhaust pipe connected to the three-way catalyst 200.

상기 UCC(300)의 상류측에 공연비의 희박 혹은 농후를 판단하는 산소센서(400)가 장착되고, UCC(300)의 하류측에 UCC(300)의 활성화 온도를 검출하기 위한 온도센서(500)가 장착되어 제어부(600)에 연결된다.An oxygen sensor 400 is installed on an upstream side of the UCC 300 to determine a lean or rich air-fuel ratio, and a temperature sensor 500 on the downstream side of the UCC 300 detects an activation temperature of the UCC 300. Is mounted and connected to the control unit 600.

따라서, 제어부(600)는 엔진 시동 온 이후 온도센서(500)의 정보를 판독하여 UCC(300)가 베드 온도의 조건이면 공기량과 부하 및 엔진 회전수로 결정되는 공연비를 희박하게 제어하고, 활성화 온도를 도달되면 이론 공연비로 복귀시킨다.Therefore, the controller 600 reads the information of the temperature sensor 500 after the engine is turned on, and if the UCC 300 is a bed temperature condition, the controller 600 leans the air-fuel ratio determined by the air amount, the load, and the engine speed, and activates the temperature. When is reached, return to the theoretical air-fuel ratio.

상기 제어부(600)는 엔진 시동 온 이후 UCC(300)가 베드 온도, 대략적으로 150℃의 조건에 도달하는 경우 공연비를 희박하게 하여 UCC(300)의 제올라이트에서 탈착되는 촉매가 삼원촉매에 의해 안정된 산화반응이 일어나도록 배기가스에 산소량을 충분하게 공급시킨다.The controller 600, when the UCC 300 reaches the bed temperature, approximately 150 ° C. after the engine is started, makes the air-fuel ratio lean so that the catalyst desorbed from the zeolite of the UCC 300 is stabilized by the three-way catalyst. Sufficient amount of oxygen is supplied to the exhaust gas so that the reaction takes place.

그리고, UCC(300)가 활성화 온도, 대략적으로 300℃의 조건에 도달하면 공연비를 이론 공연비로 제어하여 엔진의 안정된 출력을 확보하여 준다.When the UCC 300 reaches the activation temperature, approximately 300 ° C., the air-fuel ratio is controlled by the theoretical air-fuel ratio to secure a stable output of the engine.

이에 대하여 구체적으로 설명하면 다음과 같다.This will be described in detail below.

냉간 상태에서 시동 온 되면 엔진(100)에서 배출되는 THC는 촉매가 활성화되기 이전이지만 도 4에 도시된 "A1"의 영역과 같이 UCC(300)의 담체에 구성되는 제올라이트에 흡착되어 배출량이 감소하게 된다. When the engine is turned on in the cold state, the THC discharged from the engine 100 is adsorbed by the zeolite formed on the carrier of the UCC 300 as in the region of "A1" before the catalyst is activated. do.

그러나, 시간이 경과함에 따라 UCC(300)가 배기가스에 의해 가열되어 "t1" 구간에 도달하면 제올라이트에 흡착된 THC의 탈착이 발생되어 실제 UCC(300) 전단에서 입력되는 THC량 보다 더욱 많이 배출된다. However, as time passes, when the UCC 300 is heated by the exhaust gas and reaches the "t1" section, desorption of the THC adsorbed on the zeolite occurs, and more than the amount of THC input from the front end of the UCC 300 actually occurs. do.

이 구간은 UCC(300)의 제올라이트 상층에 도포된 삼원촉매의 성분이 정화온 도에 도달하지 못한 베드온도의 조건이고, 공연비의 농후한 조건에 의해 산소의 량이 부족해서 탈착된 THC를 정화하지 못하는 상태이다.This section is a condition of the bed temperature where the three-way catalyst component applied to the zeolite upper layer of the UCC 300 does not reach the purification temperature, and due to the rich condition of the air-fuel ratio, the oxygen content is insufficient to purify the desorbed THC. It is a state.

그러나, 시간이 더 경과하여 "t2"구간에 이르게 되면 UCC(300)는 활성화 온도에 도달되어 제올라이트에서 탈착되는 THC의 안정된 정화를 진행된다.However, as time elapses and reaches the "t2" section, the UCC 300 reaches the activation temperature and proceeds with the stable purification of the THC desorbed from the zeolite.

따라서, 제어부(600)는 UCC(300)의 하류측에 설치된 온도센서(500)의 정보를 판독하여 "t1~t2"구간에서 제올라이트에서 탈착되는 THC의 정화성능을 극대화하기 위해 엔진을 희박 운전으로 제어하여 배기가스에 충분한 산소량을 확보하여 준다.Therefore, the control unit 600 reads the information of the temperature sensor 500 installed downstream of the UCC 300 to maximize the purification performance of the THC desorbed from the zeolite in the "t1 ~ t2" section in the lean operation By controlling it, it is possible to secure a sufficient amount of oxygen in the exhaust gas.

이에 대한 동작을 도 5를 참조하여 설명한다.An operation thereof will be described with reference to FIG. 5.

엔진(100)의 냉간 상태에서 시동 온 되면(S101) 제어부(600)는 UCC(300)의 하류측에 설치된 온도센서(500)로부터 UCC(300)의 온도를 검출한다(S102).When the engine 100 is started up in a cold state (S101), the controller 600 detects the temperature of the UCC 300 from the temperature sensor 500 installed downstream of the UCC 300 (S102).

그리고, 온도센서(500)로부터 검출되는 UCC(300)의 온도가 제올라이트에 흡착된 THC의 탈착이 발생되는 베드온도로 설정된 제1기준온도, 예를 들어 150℃ 이상으로 가열되었는지 판단한다(S103).Then, it is determined whether the temperature of the UCC 300 detected by the temperature sensor 500 is heated to a first reference temperature set to a bed temperature at which desorption of THC adsorbed onto the zeolite occurs, for example, 150 ° C. or more (S103). .

상기 UCC(300)의 온도가 설정된 제1기준온도 이상으로 가열되었으면 제올라이트에서 THC의 탈착이 발생되나 삼원촉매의 활성화가 이루어지지 않은 조건으로 판단하여 제올라이트에서 탈착되는 THC의 정화성능을 극대화하기 위하여 공기량, 부하 및 엔진회전수의 조건으로 결정되는 공연비를 농후에서 희박 운전으로 제어한다(S104).If the temperature of the UCC (300) is heated above the set first reference temperature is determined that the desorption of THC in the zeolite but the activation of the three-way catalyst is not determined to maximize the purification performance of THC desorbed from the zeolite , The air-fuel ratio determined by the conditions of the load and the engine speed is controlled in rich to lean operation (S104).

이후, 연속적으로 UCC(300)의 온도를 검출하여(S105) 설정된 제2기준온도, 예를 들어 350℃ 이상으로 가열되었는지를 판단한다(S106).Thereafter, by continuously detecting the temperature of the UCC (300) (S105) it is determined whether the heating is set to a set second reference temperature, for example, 350 ℃ or more (S106).

상기 제2기준온도는 UCC(300)에 구성되는 삼원촉매의 활성화 온도로, 제올라이트에서 탈착되는 THC의 정상적인 정화가 가능한 조건이다.The second reference temperature is an activation temperature of the three-way catalyst that is configured in the UCC 300, and is a condition capable of normal purification of THC desorbed from the zeolite.

상기 S106에서 UCC(300)의 온도가 제2기준온도 이상으로 가열되었으면 제어부(600)는 공연비를 희박 운전에서 이론 공연비 운전으로 제어한다(S107).If the temperature of the UCC 300 is heated above the second reference temperature in S106, the controller 600 controls the air-fuel ratio from lean operation to theoretical air-fuel ratio operation (S107).

그리고, 온도센서(300)의 정보를 분석하여 UCC(300)의 열화도를 판정하며(S108), 판정되는 결과를 설정된 소정의 방식으로 제공한다(S109).Then, the information of the temperature sensor 300 is analyzed to determine the degree of deterioration of the UCC 300 (S108), and the determined result is provided in a predetermined method (S109).

이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 포함된다.Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

도 1은 차량의 배기가스 정화장치에서 촉매장치의 단면 구조 및 THC의 흡착 원리를 도시한 개념도이다.1 is a conceptual diagram showing the cross-sectional structure of the catalytic device and the adsorption principle of THC in the vehicle exhaust gas purification device.

도 2는 차량의 배기가스 정화장치에 흡착된 THC의 탈착에 따른 운전영역을 도시한 그래프이다.2 is a graph illustrating a driving region according to desorption of THC adsorbed on an exhaust gas purifying apparatus of a vehicle.

도 3은 본 발명의 실시예에 따른 배기가스 정화장치를 개략적으로 도시한 도면이다.3 is a view schematically showing an exhaust gas purifying apparatus according to an embodiment of the present invention.

도 4는 엔진 시동 후 시간의 경과에 따른 THC의 배출을 도시한 그래프이다.4 is a graph showing the discharge of THC over time after starting the engine.

도 5는 본 발명의 실시예에 따른 차량에서 배기가스 정화 제어 절차를 도시한 흐름도이다.5 is a flowchart illustrating an exhaust gas purification control procedure in a vehicle according to an exemplary embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

100 : 엔진 200 : MCC100: engine 200: MCC

300 : UCC 400 : 산소센서300: UCC 400: Oxygen Sensor

500 : 온도센서 600 : 제어부 500: temperature sensor 600: control unit

Claims (2)

냉간 운전에서 발생되는 THC를 흡착시키는 제1촉매와 제1촉매에서 탈착되는 THC와 산화 반응하는 정화시키는 제2촉매가 하나의 담체에 구성되어 배기 파이프에 장착되는 UCC;A UCC comprising a first catalyst for adsorbing THC generated in cold operation and a second catalyst for oxidizing reaction with THC desorbed from the first catalyst, mounted on an exhaust pipe; 상기 UCC의 하류측에 설치되어 UCC의 온도를 검출하는 온도센서;A temperature sensor installed at a downstream side of the UCC to detect a temperature of the UCC; 상기 온도센서의 정보를 분석하여 UCC가 베드 온도의 조건이면 공연비를 희박하게 제어하고, 활성화 온도를 도달되면 이론 공연비로 복귀시키는 제어부를 포함하는 차량의 배기가스 정화장치.And analyzing the information of the temperature sensor to control the air-fuel ratio sparsely if UCC is a condition of the bed temperature, and to return to the theoretical air-fuel ratio when the activation temperature is reached. 냉간 상태에서 엔진 시동 온이 검출되면 UCC의 온도를 측정하여 제1기준온도에 도달하였는지 판단하는 과정;Determining whether the first reference temperature is reached by measuring the temperature of the UCC when the engine start-up is detected in the cold state; UCC의 온도가 제1기준온도에 도달되었으면 공연비를 희박 연소로 제어하는 과정;If the temperature of the UCC reaches the first reference temperature, controlling the air-fuel ratio to lean combustion; 시간의 경과에 따라 UCC의 온도가 제2기준온도에 도달되면 이론 공연비의 연소를 제어하는 과정을 포함하는 차량의 배기가스 정화장치 제어방법.And controlling the combustion of the theoretical air-fuel ratio when the temperature of the UCC reaches the second reference temperature over time.
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