KR100405689B1 - The equipment of decreasing exhaust fumes using nox sensor and the method thereof - Google Patents
The equipment of decreasing exhaust fumes using nox sensor and the method thereof Download PDFInfo
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- KR100405689B1 KR100405689B1 KR10-2001-0012851A KR20010012851A KR100405689B1 KR 100405689 B1 KR100405689 B1 KR 100405689B1 KR 20010012851 A KR20010012851 A KR 20010012851A KR 100405689 B1 KR100405689 B1 KR 100405689B1
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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
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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
- 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
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
촉매 후단에 배출되는 NOx 농도를 감지하여 상한값 이상일 때는 희박 운전에서 이론 공연비 운전으로 전환하여 촉매를 재생시키고, 배출되는 NOx 농도가 하한값 이하일 때 다시 희박 운전을 한다. 연료 내에 포함되어 있는 황(S)의 경우 흡장형 촉매 내에서 NOx가 차지할 공간을 차지하여 SO3로 되어 NOx가 차지할 공간이 적어져서 NOx의 흡장 효율을 떨어뜨리며 이 결과로 재생 시기가 빨라진다. 촉매의 재생 시기가 기준값보다 빨리 찾아오면 탈황을 한다. 탈황 시기가 기준값보다 너무 빨리 찾아오면 촉매가 노화에 의해 페일된 것으로 판단한다. 즉, 재생은 희박 운전을 제한하여 연비의 손실을 가져오므로 촉매의 황피독이나 노화는 흡장형 촉매의 재생의 부분을 증가시켜서 초희박 엔진의 연비 이득을 제한하므로 재생은 최소화함이 요구된다. 이와 같이 본 발명에서는 직접적인 NOx 계측으로 재생을 판단하므로 복잡한 회로 설계가 불필요하며 센서 수를 줄여 제작이 간단하다. 또한, 이론 공연비 운전으로 인한 연비 손실량을 줄이고 초희박 운전 범위로 확대할 수 있으므로 연비 개선 효과가 크다.When the NOx concentration emitted after the catalyst is sensed above the upper limit value, the catalyst is regenerated by switching from the lean operation to the theoretical air-fuel ratio operation, and the lean operation is performed again when the emitted NOx concentration is lower than the lower limit value. Sulfur (S) contained in the fuel occupies the space occupied by NOx in the occupied catalyst and becomes SO 3 , thereby reducing the space occupied by NOx, thereby lowering the occlusion efficiency of NOx and, as a result, the regeneration time is faster. Desulfurization occurs when the catalyst regeneration time comes earlier than the reference value. If the time of desulfurization comes too soon than the reference value, it is determined that the catalyst has failed due to aging. In other words, the regeneration limits the lean operation, resulting in the loss of fuel efficiency, so the poisoning or aging of the catalyst increases the portion of the regeneration of the occlusion type catalyst, thereby limiting the fuel efficiency gain of the ultra-lean engine, and thus minimizing the regeneration. As described above, in the present invention, the reproduction is judged by direct NOx measurement, so that a complicated circuit design is unnecessary, and the number of sensors is reduced, and thus the production is simple. In addition, fuel efficiency loss due to theoretical air-fuel operation can be reduced and the fuel efficiency improvement can be extended to the ultra-thin operation range.
Description
본 발명은 NOx 센서를 이용한 배기 가스 저감장치 및 그 방법에 관한 것이다.The present invention relates to an exhaust gas reduction apparatus using a NOx sensor and a method thereof.
엔진으로부터 배기되는 배기 가스 속에는 인체에 유해하고 환경 오염을 유발하는 CO, HC, NOx 등이 다량 포함되어 있기 때문에 이들 유해 가스를 무해한 CO2, H2, N2로 산화 환원시켜 배출하기 위하여 촉매 컨버터를 배기 파이프의 도중 또는 배기 매니폴드에 설치하고 있다.Exhaust gas exhausted from the engine contains a large amount of CO, HC, and NOx, which are harmful to humans and cause environmental pollution. Therefore, catalytic converters are used to oxidize and reduce these harmful gases to harmless CO 2 , H 2 , and N 2 . In the middle of the exhaust pipe or in the exhaust manifold.
촉매 변환기의 촉매는 고온의 배기 가스에 노출되어 있어 열화되거나 배기 가스 속에 포함된 탄화물 등이 벌집 모양의 촉매의 표면에 침착되어 촉매의 정화 기능을 저하시키는 일이 발생하게 된다.The catalyst of the catalytic converter is exposed to a high temperature exhaust gas, and deterioration or carbides contained in the exhaust gas is deposited on the surface of the honeycomb catalyst to deteriorate the purification function of the catalyst.
그러나 최근 각국은 환경 오염의 심각성을 인식하여 배기 가스 배출을 엄격하게 규제하는 추세이므로 정화 기능이 기준치 이하로 저하된 촉매 변환기를 방치할 경우 법규 요건을 충족치 못하여 관계 당국에 적발 시 차량 운전자 및 소유자가 배기 가스 과다 배출로 처벌받을 수 있는 개연성이 존재한다.However, in recent years, countries are seriously restricting the emission of emissions due to the seriousness of environmental pollution, so if the catalytic converter is left uncleaned below the standard value, it will not meet the legal requirements. There is a possibility of being punished for excessive exhaust gas.
한편, 촉매 변환기 특히 현재까지 정화 효율이 가장 높은 것으로 알려져 있는 삼원 촉매 변환기는 엄격한 이론 공연비 범위 내에서만 정화 효율이 최적으로 유지되므로 이론 공연비 유지를 위한 피드백 제어 수단으로 배기 파이프의 도중에 산소 센서를 장착하여 배기 가스 중에 포함된 산소 농도량에 의해 연료의 농후와 희박 상태를 검출한 후 이 정보를 공연비 제어를 위한 피드백 제어에 사용한다.On the other hand, catalytic converters, especially the three-way catalytic converters, which are known to have the highest purification efficiency to date, maintain optimum purification efficiency only within the strict theoretical air-fuel ratio range, so that an oxygen sensor is mounted in the middle of the exhaust pipe as a feedback control means for maintaining the theoretical air-fuel ratio. After detecting the rich and lean state of fuel by the oxygen concentration contained in exhaust gas, this information is used for feedback control for air-fuel ratio control.
산소 센서는 촉매 변환기의 정화 효율 유지에 필수적임과 동시에 촉매 변환기의 고장 판정에도 산소 센서가 사용되는데, 이들 산소 센서가 단선이나 쇼트 등에 의해 손상 시에는 피드백 제어와 촉매의 손상 검출이 불가능하여 촉매의 고장시에 이를 알 수 없어 대기 오염을 유발하는 문제점이 있다.Oxygen sensor is essential for maintaining the catalytic converter's purification efficiency and oxygen sensor is also used to determine the failure of catalytic converter. When the oxygen sensor is damaged by disconnection or short, etc., feedback control and catalyst damage detection are impossible. There is a problem that causes air pollution because it is not known at the time of failure.
촉매 변환기(간략히 촉매라 한다.)는 배기 파이프의 도중에 마련되어 엔진으로부터 배기되는 배기 가스 중의 유해 성분을 제거한다.A catalytic converter (abbreviated as catalyst) is provided in the middle of the exhaust pipe to remove harmful components in the exhaust gas exhausted from the engine.
촉매의 전방 위치인 배기 파이프 상에는 전방 산소 센서가 설치되어 있으며, 촉매의 후방 위치인 배기 파이프에는 후방 산소 센서가 설치되어 있다. 산소 센서는 촉매의 정화 성능을 최대로 발휘하기 위해 공연비를 모든 운전 조건하에서 항상 이론 공연비가 되도록 연료 분사량을 피드백 제어하기 위해 설치되는 장치로서 배기 가스 중의 산소 농도를 검출하여 이를 전기적 신호로 출력하여 전자 제어 장치에 인가한다.The front oxygen sensor is provided on the exhaust pipe which is a front position of a catalyst, and the rear oxygen sensor is provided in the exhaust pipe which is a rear position of a catalyst. Oxygen sensor is a device that is installed to feedback control the fuel injection amount so that the air-fuel ratio is always the theoretical air-fuel ratio under all operating conditions in order to maximize the catalytic purification performance. The oxygen sensor detects the oxygen concentration in the exhaust gas and outputs it as an electrical signal. Applied to the control device.
이러한 산소 센서는 희박 운전에서는 신호를 내지 않으나 NOx와 O2가 흡장 물질에서 완전히 비었을 때에 신호를 낸다.These oxygen sensors do not signal in lean operation but signal when NOx and O 2 are completely empty in the occlusion material.
한편, 촉매의 재생(regeneration)은 배기 가스 온도, 공기 밀도, 람다(λ: 공연비를 이론 공연비로 나눈 값), 엔진 속도, 연료 밀도, EGR율(exhaust gas recirculation rate) 등을 측정하여 흡장형 촉매 내의 NOx 농도를 계산하여 촉매의 재생 및 공연비를 결정한다. 흡장형 촉매의 후단에 산소 센서를 설치하여 재생에 의하여 NOx와 산소가 흡장 물질에서 완전히 비었을 때에 다시 희박 운전으로 돌아간다. 재생 시작 후에 산소 센서가 신호를 내기까지의 딜레이 시간을 측정한다. 이러한 딜레이 시간이 짧을수록 흡장 효율이 낮음을 의미한다. 이러한 딜레이 시간이 어느 이하로 떨어지면 촉매의 탈황을 시작하며, 탈황을 하여도 딜레이 시간이 어느 이하로 떨어지면 촉매 노화(aging)에 의한 페일(fail)로 판단한다.On the other hand, regeneration of the catalyst is carried out by measuring exhaust gas temperature, air density, lambda (λ: air-fuel ratio divided by theoretical air-fuel ratio), engine speed, fuel density, exhaust gas recirculation rate, etc. The NOx concentration in the catalyst is calculated to determine the regeneration and air-fuel ratio of the catalyst. An oxygen sensor is installed at the rear end of the occlusion type catalyst and returns to lean operation when NOx and oxygen are completely empty from the occlusion material by regeneration. After the start of regeneration, the oxygen sensor measures the delay time until the signal is generated. The shorter the delay time, the lower the storage efficiency. Desulfurization of the catalyst starts when the delay time falls below a certain value, and when the delay time drops below a certain degree even after desulfurization, it is determined as a failure due to catalyst aging.
여기서, 촉매의 재생은 배기 가스 온도, 공기 밀도, 람다, 엔진 속도, 연료 밀도, EGR율 등을 측정하여 흡장형 촉매 내의 NOx 농도를 계산하여 촉매의 재생 및 공연비를 결정하므로 이론 공연비 운전에 의한 연비 손실량이 커진다. 또한, 촉매 모니터링하기 위하여 많은 센서와 복잡한 회로가 필요하다.Here, the regeneration of the catalyst is determined by measuring exhaust gas temperature, air density, lambda, engine speed, fuel density, EGR ratio, etc. and calculating NOx concentration in the occlusion catalyst to determine the regeneration and air-fuel ratio of the catalyst. The loss is large. In addition, many sensors and complex circuits are required for catalyst monitoring.
본 발명이 이루고자 하는 기술적 과제는 흡장형 촉매의 후단에 XOx 센서를 설치하여 배출되는 NOx의 농도에 따라 흡장형 촉매의 재생 및 탈황시기를 결정 제어하도록 한 것이다.The technical problem to be achieved by the present invention is to determine the regeneration and desulfurization time of the storage catalyst according to the concentration of NOx discharged by installing the XOx sensor at the rear end of the storage catalyst.
도 1은 본 발명의 실시예에 따른 NOx 센서를 이용한 배기 가스 저감장치를 도시한 도면이고,1 is a view showing an exhaust gas reducing device using a NOx sensor according to an embodiment of the present invention,
도 2는 NOx 센서를 이용한 NOx의 모니터링을 도시한 도면이고,2 is a diagram illustrating monitoring of NOx using a NOx sensor,
도 3은 NOx 센서를 이용한 NOx 흡장형 촉매의 모니터링을 나타내는 순서도이다.3 is a flowchart showing the monitoring of a NOx sorbent catalyst using a NOx sensor.
본 발명에 따르면, 엔진에 연결되어 있으며 배기 매니폴드에 용접시킨 배기 매니폴드 일체형 촉매(CCC)가 있고, 희박 운전 시에 일시적으로 NOx를 잡고 있다가 이론 공연비 운전 시에 NOx를 환원하는 NOx 흡장형 촉매가 있다. 흡장형 촉매의 후단에는 배출되는 NOx 농도를 감지하여 흡장형 촉매의 재생 및 탈황 시기를 결정하는 NOx 센서가 설치되어 있다.According to the present invention, there is an exhaust manifold-integrated catalyst (CCC) connected to an engine and welded to an exhaust manifold, and is a NOx occlusion type that temporarily holds NOx in lean operation and then reduces NOx in theoretical air-fuel ratio operation. There is a catalyst. The NOx sensor is installed at the rear end of the sorbent catalyst to determine the discharged NOx concentration to determine the regeneration and desulfurization timing of the sorbent catalyst.
이러한 NOx 센서를 이용한 배기 가스 저감장치를 이용한 배기 가스 저감방법은 다음과 같다.An exhaust gas reduction method using an exhaust gas reduction apparatus using such a NOx sensor is as follows.
먼저, 배출되는 NOx 농도가 상한값 이상일 때 이론 공연비 운전을 하여 촉매를 재생시키고, 배출되는 NOx 농도가 하한값 이하일 때 희박 운전을 한다. 다음, 촉매의 재생 시기가 기준값보다 빨리 나타나면 탈황시키고, 탈황 시기가 기준값보다 빨리 나타나면 촉매가 노화된 것으로 판단한다.First, when the exhausted NOx concentration is above the upper limit, the theoretical air-fuel ratio operation is performed to regenerate the catalyst, and when the exhausted NOx concentration is below the lower limit, the lean operation is performed. Next, when the regeneration time of the catalyst is earlier than the reference value, it is desulfurized. When the desulfurization time is earlier than the reference value, it is determined that the catalyst is aged.
이와 같이 본 발명에서는 NOx 센서를 이용하여 직접적으로 NOx 계측으로 재생을 판단하므로 복잡한 회로 설계가 불필요하며 센서 수를 줄여 제작이 간단하다. 또한, 이론 공연비 운전으로 인한 연비 손실량을 줄이고 초희박 운전 범위로 확대할 수 있으므로 연비 개선 효과가 크다.As described above, in the present invention, the NOx sensor is used to directly determine NOx measurement, so that complicated circuit design is unnecessary and the number of sensors is reduced to simplify production. In addition, fuel efficiency loss due to theoretical air-fuel operation can be reduced and the fuel efficiency improvement can be extended to the ultra-thin operation range.
그러면, 첨부한 도면을 참조하여 본 발명의 실시예에 따른 NOx 센서를 이용한 배기 가스 저감장치 및 그 방법에 대하여 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있을 정도로 상세히 설명한다.Then, with reference to the accompanying drawings will be described in detail so that it can be easily implemented by those of ordinary skill in the art with respect to the exhaust gas reduction device and method using the NOx sensor according to an embodiment of the present invention. do.
먼저, 도 1을 참조하여 본 발명의 실시예에 따른 NOx 센서를 이용한 배기 가스 저감장치에 대하여 설명한다.First, an exhaust gas reduction apparatus using a NOx sensor according to an exemplary embodiment of the present invention will be described with reference to FIG. 1.
도 1에서와 같이, 엔진(10)에 촉매의 정화 효율을 높이기 위해 배기 매니폴드에 용접시킨 촉매인 배기 매니폴드 일체형 촉매(CCC: close coupled catalyst)(20)가 연결되어 있고, 배기 매니폴드 일체형 촉매(20)와 연결되어 있는 NOx 흡장형 촉매(30)의 후단에는 배출되는 NOx 농도를 감지하여 NOx 흡장형 촉매(30)의 재생 및 탈황 시기를 결정하는 NOx 센서(40)가 설치되어 있다. 여기서, NOx 흡장형 촉매(30)는 희박 운전시 과잉 산소 분위기에서 일시적으로 NOx를 잡고 있다가 이론 공연비 운전역에서 NOx를 환원한다.As shown in FIG. 1, an exhaust manifold integrated catalyst (CCC) 20, which is a catalyst welded to the exhaust manifold, is connected to the engine 10 to increase the purification efficiency of the catalyst. A NOx sensor 40 is installed at a rear end of the NOx storage catalyst 30 connected to the catalyst 20 to determine the discharged NOx concentration catalyst 30 to determine when to regenerate and desulfurize the NOx storage catalyst 30. Here, the NOx storing catalyst 30 temporarily holds NOx in an excess oxygen atmosphere during lean operation, and then reduces NOx in the theoretical air-fuel ratio driving region.
그러면, 이러한 NOx 센서를 이용한 배기 가스 저감방법에 대하여 도 2 및 도 3을 참조하여 설명한다.Next, an exhaust gas reduction method using the NOx sensor will be described with reference to FIGS. 2 and 3.
도 2는 NOx 센서를 이용한 NOx의 모니터링을 도시한 것이고, 도 3은 NOx 센서를 이용한 NOx 흡장형 촉매의 모니터링을 나타내는 순서도이다.Figure 2 shows the monitoring of NOx using the NOx sensor, Figure 3 is a flow chart showing the monitoring of the NOx storage catalyst using the NOx sensor.
그러면, NOx 센서를 이용한 NOx 흡장형 촉매의 모니터링, 예를 들면 재생, 탈황 및 노화 과정에 대하여 설명한다.The monitoring of the NOx sorbent catalyst using the NOx sensor, for example, the regeneration, desulfurization and aging processes will be described.
먼저, 촉매 후단에 배출되는 NOx 농도를 감지하여 상한값 이상일 때는 희박 운전에서 이론 공연비 운전으로 전환하여 촉매를 재생시키고, 배출되는 NOx 농도가 하한값 이하일 때 다시 희박 운전을 한다. 여기서, 재생은 희박 운전 중에 NOx 흡장형 촉매가 저장하고 있는 NOx를 환원하기 위하여 희박 운전 중에 촉매가 일시적으로 저장하고 있는 NOx가 가득 찰 때 이론 공연비 운전을 하여 촉매에 있는 NOx를 환원함을 말한다.First, when the NOx concentration emitted to the rear end of the catalyst is detected and the upper limit value or more, the catalyst is regenerated by switching from the lean operation to the theoretical air-fuel ratio operation, and the lean operation is performed again when the emitted NOx concentration is lower than or equal to the lower limit value. Here, regeneration refers to reducing the NOx in the catalyst by performing a theoretical air-fuel ratio operation when the NOx stored temporarily by the catalyst is filled during the lean operation to reduce the NOx stored by the NOx storage catalyst during the lean operation.
한편, 연료 내에 포함되어 있는 황(S)의 경우 흡장형 촉매 내에서 NOx가 차지할 공간을 차지하여 SO3로 되어 NOx가 차지할 공간이 적어져서 NOx의 흡장 효율을 떨어뜨리며 이 결과로 재생 시기가 빨라진다. 촉매의 재생 시기가 기준값보다 빨리 찾아오면 탈황을 한다. 여기서, 탈황은 SO3의 경우 고온의 650℃ 이상에서 흡장 물질에서 분리되므로 엔진에서 후분사를 하여 강제적으로 배기 온도를 높여 SOx를 분리시키는 것을 말한다. 또한, 탈황 시기도 기준값보다 너무 빨리 찾아오면 촉매가 노화에 의해 페일된 것으로 판단한다.On the other hand, sulfur (S) contained in the fuel occupies the space occupied by NOx in the occupied catalyst, becomes SO 3 , and the space occupied by NOx decreases, thereby reducing the occlusion efficiency of NOx and as a result, the regeneration time is faster. . Desulfurization occurs when the catalyst regeneration time comes earlier than the reference value. In this case, desulfurization refers to separating SOx by forcibly increasing the exhaust temperature by post-injection in the engine since SO 3 is separated from the occluding material at a high temperature of 650 ° C. or higher. In addition, when the desulfurization time comes too early than the reference value, it is determined that the catalyst has failed due to aging.
즉, 재생은 희박 운전을 제한하여 연비의 손실을 가져오므로 촉매의 황피독이나 노화는 흡장형 촉매의 재생의 부분을 증가시켜서 초희박 엔진의 연비 이득을 제한하므로 재생은 최소화함이 요구된다.In other words, the regeneration limits the lean operation, resulting in the loss of fuel efficiency, so the poisoning or aging of the catalyst increases the portion of the regeneration of the occlusion type catalyst, thereby limiting the fuel efficiency gain of the ultra-lean engine, and thus minimizing the regeneration.
이와 같이 본 발명에서는 직접적인 NOx 계측으로 재생을 판단하므로 복잡한 회로 설계가 불필요하며 센서 수를 줄여 제작이 간단하다. 또한, 이론 공연비 운전으로 인한 연비 손실량을 줄이고 초희박 운전 범위로 확대할 수 있으므로 연비 개선 효과가 크다.As described above, in the present invention, the reproduction is judged by direct NOx measurement, so that a complicated circuit design is unnecessary, and the number of sensors is reduced, and thus the production is simple. In addition, fuel efficiency loss due to theoretical air-fuel operation can be reduced and the fuel efficiency improvement can be extended to the ultra-thin operation range.
이와 같이 본 발명에서는 NOx 센서를 이용하여 직접적으로 NOx 계측으로 재생을 판단하므로 복잡한 회로 설계가 불필요하며 센서 수를 줄여 제작이 간단하다. 또한, 이론 공연비 운전으로 인한 연비 손실량을 줄이고 초희박 운전 범위로 확대할 수 있으므로 연비 개선 효과가 크다.As described above, in the present invention, the NOx sensor is used to directly determine NOx measurement, so that complicated circuit design is unnecessary and the number of sensors is reduced to simplify production. In addition, fuel efficiency loss due to theoretical air-fuel operation can be reduced and the fuel efficiency improvement can be extended to the ultra-thin operation range.
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| KR101048112B1 (en) | 2009-12-02 | 2011-07-08 | 현대자동차주식회사 | Exhaust gas purification device of internal combustion engine and desulfurization method thereof |
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| KR100821793B1 (en) * | 2005-12-12 | 2008-04-11 | 현대자동차주식회사 | METHOD FOR REGENERATING A NOx ABSORBING CATALYST |
| KR100820395B1 (en) * | 2007-01-24 | 2008-04-08 | 현대자동차주식회사 | Nox reduction method and apparatus of exhaust gas |
| JP6897605B2 (en) * | 2018-03-05 | 2021-06-30 | トヨタ自動車株式会社 | Exhaust purification device for internal combustion engine |
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