KR20110049154A - Deterioration rate determination method and the system thereof - Google Patents

Deterioration rate determination method and the system thereof Download PDF

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KR20110049154A
KR20110049154A KR1020090106026A KR20090106026A KR20110049154A KR 20110049154 A KR20110049154 A KR 20110049154A KR 1020090106026 A KR1020090106026 A KR 1020090106026A KR 20090106026 A KR20090106026 A KR 20090106026A KR 20110049154 A KR20110049154 A KR 20110049154A
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temperature
oxidation catalyst
theoretical
actual
exhaust gas
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KR1020090106026A
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Korean (ko)
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조지호
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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
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity 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
    • 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
    • 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)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

PURPOSE: A method and a system for determining the deterioration rate of an oxidation catalyst are provided to easily determine the deterioration rate of catalyst by calculating the temperature of exhaust gas through a simple formula and comparing the theoretical temperature with the actual temperature. CONSTITUTION: A method for determining the deterioration rate of an oxidation catalyst. The actual inlet temperature of exhaust gas passing through the entrance of an oxidation catalyst(130) is measured. The temperature of the theoretical interior gas passing through the oxidation catalyst is computed using the actual inlet temperature. The theoretical outlet temperature of the exhaust gas passing through the exit of the oxidation catalyst is computed using the actual inlet temperature and the theoretical interior gas temperature. At the state excluding the oxidation heat of the oxidation catalyst, the temperature and theoretical outlet temperature of the theoretical interior gas are calculated. The actual outlet temperature of the exhaust gas passing through the exit of the oxidation catalyst is measured. The difference between the theoretical outlet temperature and the actual outlet temperature is computed. The degradation rate of the oxidation catalyst is determined by comparing the difference with the set value.

Description

산화촉매의 열화도 판단방법 및 이의 시스템{DETERIORATION RATE DETERMINATION METHOD AND THE SYSTEM THEREOF}Degradation degree of oxidation catalyst and its system {DETERIORATION RATE DETERMINATION METHOD AND THE SYSTEM THEREOF}

본 발명은 산화촉매의 열화도 판단시스템에 관한 것으로서, 보다 상세하게는 배기가스에 포함된 유해물질을 정화하는 산화촉매의 열화도를 판단하는 산화촉매의 열화도 판단방법 및 이의 시스템에 관한 것이다.The present invention relates to a system for determining the deterioration degree of an oxidation catalyst, and more particularly, to a method and a system for determining the deterioration degree of an oxidation catalyst for determining the deterioration degree of an oxidation catalyst for purifying harmful substances contained in exhaust gas.

일반적으로 엔진에서 배기 매니폴드를 통해 배출되는 배기가스는 배기 파이프의 도중에 형성된 정화촉매(purification catalyst)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 induced and purified by a purification catalyst formed in the middle of the exhaust pipe.

상기 정화촉매는 배기가스에 포함되어 있는 오염물질을 처리한다. 그리고 배기 파이프 상에는 배기가스에 포함된 입자상 물질(PM)을 포집하기 위한 매연 필터가 더 장착된다.The purifying catalyst treats contaminants contained in the exhaust gas. The exhaust pipe is further equipped with a soot filter for collecting particulate matter (PM) included in the exhaust gas.

한편, 상기 정화촉매는 열에너지와 기타 유해물질에 의해서 열화(deterioration)되며, 그 열화도(deterioration rate)를 정확하게 예측하는 연구가 진행되고 있다.On the other hand, the purification catalyst is deteriorated by the thermal energy and other harmful substances (deterioration), a study to accurately predict the deterioration rate (deterioration rate) is in progress.

따라서, 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 창출된 것으로, 본 발명의 목적은 정화촉매의 열화도를 효과적으로 감지하는 산화촉매의 열화도 판단시스템을 제공하는 것이다.Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a system for determining the deterioration degree of an oxidation catalyst that effectively detects the deterioration degree of a purification catalyst.

이러한 목적을 달성하기 위한 본 발명의 실시예에 따른 산화촉매의 열화도 판단방법은, 산화촉매의 입구를 지나는 배기가스의 실제유입온도를 측정하는 실제유입온도측정단계, 상기 실제유입온도를 이용하여 상기 산화촉매를 지나는 이론내부가스의 온도를 연산하는 이론내부가스온도연산단계, 상기 실제유입온도와 상기 이론내부가스온도를 이용하여 상기 산화촉매의 출구를 지나는 배기가스의 이론유출온도를 연산하는 이론유출온도연산단계, 상기 산화촉매의 출구를 지나는 배기가스의 실제유출온도를 측정하는 실제유출온도측정단계, 상기 실제유출온도와 상기 이론유출온도의 차이값을 연산하는 차이값연산단계, 및 상기 차이값의 크기를 설정된 값과 비교하여 상기 산화촉매의 열화도를 판단하는 열화도판단단계를 포함한다.Degradation degree determination method of the oxidation catalyst according to an embodiment of the present invention for achieving this object, using the actual inlet temperature measuring step of measuring the actual inlet temperature of the exhaust gas passing through the inlet of the oxidation catalyst, using the actual inlet temperature The theoretical internal gas temperature calculation step of calculating the temperature of the theoretical internal gas passing through the oxidation catalyst, the theory of calculating the theoretical outflow temperature of the exhaust gas passing through the outlet of the oxidation catalyst using the actual inlet temperature and the theoretical internal gas temperature An outflow temperature operation step, an actual outflow temperature measurement step of measuring an actual outflow temperature of the exhaust gas passing through the outlet of the oxidation catalyst, a difference value calculation step of calculating a difference value between the actual outflow temperature and the theoretical outflow temperature, and the difference And a deterioration determination step of determining the deterioration degree of the oxidation catalyst by comparing the magnitude of the value with a set value.

상기 이론내부가스온도연산단계 또는 상기 이론유출온도연산단계에서, 상기 산화촉매의 산화반응열을 배제한 상태에서 상기 이론내부가스의 온도 및 상기 이론유출온도를 계산하는 것을 특징으로 한다.In the theoretical internal gas temperature calculation step or the theoretical outflow temperature calculation step, the temperature of the theoretical internal gas and the theoretical outflow temperature are calculated in a state in which heat of oxidation reaction of the oxidation catalyst is excluded.

상기 이론내부가스온도연산단계 또는 상기 이론유출온도연산단계에서, 상기 이론유출온도를 연산하기 위해서 배기가스의 유량을 감지하는 유량감지단계를 더 포함하고, 상기 유량감지단계에서, 엔진의 내부로 유입되는 유입공기유량을 이용하 여 배기가스의 유량을 연산한다.In the theoretical internal gas temperature operation step or the theoretical outflow temperature operation step, the flow rate detection step for detecting the flow rate of the exhaust gas to calculate the theoretical outflow temperature further comprises, in the flow rate detection step, the flow into the engine The flow rate of the exhaust gas is calculated using the incoming air flow rate.

이러한 목적을 달성하기 위한 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템은, 배기라인에 설치된 산화촉매, 상기 산화촉매의 입구 또는 출구에 배치되어 배기가스의 실제유입온도와 실제유출온도를 측정하는 유입온도센서 및 유출온도센서, 엔진의 유입공기유량을 감지하는 유량센서, 및 설정된 프로그램에 의해서 동작하여 상기 유입온도센서, 상기 유출온도센서, 및 상기 유량센서로부터 감지된 신호를 이용하여 상기 산화촉매의 열화도를 판단하는 제어부를 포함하고, 상기 제어부는, 상기 산화촉매의 열화도 판단방법을 수행하기 위한 일련의 명령을 포함하는 것을 특징으로 한다.The deterioration degree determination system of the oxidation catalyst according to an embodiment of the present invention for achieving this object is arranged at the inlet or outlet of the oxidation catalyst, the oxidation catalyst installed in the exhaust line to determine the actual inlet temperature and the actual outlet temperature of the exhaust gas The inflow temperature sensor and the outflow temperature sensor to measure, the flow sensor for detecting the inlet air flow rate of the engine, and by operating the program set by using the signal detected from the inlet temperature sensor, the outflow temperature sensor, and the flow sensor And a control unit for determining the degree of deterioration of the oxidation catalyst, wherein the control unit includes a series of instructions for performing a method for determining the degree of deterioration of the oxidation catalyst.

상술한 바와 같이 본 발명에 따르면, 산화촉매의 반응이 없는 경우의 배기가스 유출온도를 간단한 수식으로 연산하고, 그 이론유출온도와 실제유출온도를 비교함으로써 촉매의 열화도를 실시간으로 비교적 용이하게 판단한다.As described above, according to the present invention, it is relatively easy to determine the degree of deterioration of the catalyst in real time by calculating the exhaust gas outflow temperature when there is no reaction of the oxidation catalyst by a simple formula and comparing the theoretical outflow temperature with the actual outflow temperature. do.

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 산화촉매의 열화도 판단시스템의 개략적인 구성도이다.1 is a schematic configuration diagram of a system for determining a deterioration degree of an oxidation catalyst according to an exemplary embodiment of the present invention.

도 1을 참조하면, 산화촉매의 열화도 판단시스템은 흡기라인(100), 엔진(110), 배기라인(120), 제어부(140), 제1센서(S1, 유량센서), 제2센서(S2, 유입 온도센서), 및 제3센서(S3, 유출온도센서)를 포함하여 구성된다.Referring to FIG. 1, the deterioration determination system of the oxidation catalyst includes an intake line 100, an engine 110, an exhaust line 120, a control unit 140, a first sensor S1, a flow sensor, and a second sensor ( S2, an inflow temperature sensor), and a third sensor (S3, outflow temperature sensor).

상기 흡기라인(100)을 통해서 연소용 공기가 상기 엔진(110)으로 공급되고, 상기 흡기라인(100)에 설치된 상기 제1센서(S1)는 그 유량을 감지한다. Combustion air is supplied to the engine 110 through the intake line 100, and the first sensor S1 installed in the intake line 100 senses the flow rate.

상기 제1센서에서 감지된 유량신호는 상기 제어부(140)로 전달되어 배기가스의 유량을 연산하는데 사용된다.The flow rate signal detected by the first sensor is transmitted to the controller 140 and used to calculate the flow rate of the exhaust gas.

상기 배기라인(120)을 통해서 연소된 배기가스가 흐르고, 그 중간에는 배기가스 내부의 유해가스를 정화하는 상기 산화촉매(130)가 배치된다. The combustion exhaust gas flows through the exhaust line 120, and an oxidation catalyst 130 for purifying harmful gas in the exhaust gas is disposed in the middle of the exhaust gas 120.

상기 산화촉매(130)는 배기가스에 포함된 일산화탄소와 탄화수소 등을 물과 이산화탄소로 전환하고, NOx를 NO2로 산화시킨다.The oxidation catalyst 130 converts carbon monoxide and hydrocarbons contained in the exhaust gas into water and carbon dioxide, and oxidizes NOx to NO2.

상기 산화촉매(130)의 상류측에는 상기 제2센서(S2)가 배치되고, 하류측에는 상기 제3센서(S3)가 배치되며, 상기 제2센서(S2) 및 상기 제3센서(S3)는 상기 배기라인(120)을 지나는 배기가스의 온도를 감지한다. The second sensor S2 is disposed upstream of the oxidation catalyst 130, and the third sensor S3 is disposed downstream, and the second sensor S2 and the third sensor S3 are disposed on the downstream side of the oxidation catalyst 130. The temperature of the exhaust gas passing through the exhaust line 120 is sensed.

상기 제2센서(S2) 및 상기 제3센서(S3)에서 감지된 배기가스의 온도는 상기 제어부(140)로 전달되고, 상기 산화촉매(130)의 열화도를 판단하는데 사용된다.The temperature of the exhaust gas detected by the second sensor S2 and the third sensor S3 is transmitted to the controller 140 and used to determine the degree of deterioration of the oxidation catalyst 130.

도 2는 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템의 개략적인 열전달 모델이다.2 is a schematic heat transfer model of a system for determining the deterioration degree of an oxidation catalyst according to an exemplary embodiment of the present invention.

도 2를 참조하면, 상기 배기라인(120)에 설치된 상기 산화촉매(130)의 열전달 모델을 개략적으로 표시한 것으로, 배기가스의 에너지 변화율은 아래 수식 1과 같이 표현된다.Referring to FIG. 2, a heat transfer model of the oxidation catalyst 130 installed in the exhaust line 120 is schematically displayed. The energy change rate of the exhaust gas is expressed by Equation 1 below.

[수식1][Equation 1]

Figure 112009067854216-PAT00001
Figure 112009067854216-PAT00001

배기가스의 에너지 변화율은 유입되는 열량에서 유출되는 열량과 내부에서 소실되는 열량을 뺀 값이다.The energy change rate of the exhaust gas is obtained by subtracting the amount of heat flowing out and the amount of heat lost inside.

아울러, 상기 산화촉매(130)를 구성하는 담체(bed, substrate)의 에너지 변화율은 아래 수식2와 같이 표현된다.In addition, the rate of change of energy of the carrier (bed, substrate) constituting the oxidation catalyst 130 is expressed as Equation 2 below.

[수식2][Equation 2]

Figure 112009067854216-PAT00002
Figure 112009067854216-PAT00002

상기 산화촉매(130)의 에너지 변화율을 계산하는 데 있어서, 상기 산화촉매(130)에서 발생되는 산화발열이 없는 것으로 가정한다. In calculating the rate of change of the energy of the oxidation catalyst 130, it is assumed that there is no oxidation heat generated in the oxidation catalyst 130.

즉, 상기 산화촉매(130)의 후단부 온도를 연산하기 위해서 상기 산화촉매(130)의 내부에서 발생되는 산화발열은 무시한다.That is, in order to calculate the temperature of the rear end of the oxidation catalyst 130, the oxidation heat generated inside the oxidation catalyst 130 is ignored.

상기 산화촉매(130)의 상류측을 지나는 배기가스의 온도는 상기 제2센서(S2)에 의해서 감지되고, 아래 수식 3, 수식 4, 및 수식 5을 이용하여 상기 산화촉매(130)의 하류측을 지나는 배기가스의 이론유출온도가 연산된다.The temperature of the exhaust gas passing through the upstream side of the oxidation catalyst 130 is sensed by the second sensor S2, and the downstream side of the oxidation catalyst 130 using Equations 3, 4, and 5 below. The theoretical outflow temperature of the exhaust gas passing through is calculated.

[수식 3][Equation 3]

Figure 112009067854216-PAT00003
Figure 112009067854216-PAT00003

[수식 4][Equation 4]

Figure 112009067854216-PAT00004
Figure 112009067854216-PAT00004

[수식 5][Equation 5]

Figure 112009067854216-PAT00005
Figure 112009067854216-PAT00005

상기 수식1, 수식2, 수식3, 수식4, 및 수식5를 이용하여 상기 산화촉매 후단부의 이론유출온도를 연산하는 방법은 열역학(thermodynamics) 및 열전달공학(heat transfer engineering)에서 공지된 것이므로 상세한 설명은 생략한다.The method for calculating the theoretical outflow temperature at the rear end of the oxidation catalyst using Equations 1, 2, 3, 4, and 5 is well known in thermodynamics and heat transfer engineering. Is omitted.

아래 표1은 상기 수식들을 계산하기 위한 기타 상수들을 보여주면, 상기 상수들은 설계사양에 따라서 주어지는 값으로, 설계사양에 따라서 변경될 수 있다.Table 1 below shows the other constants for calculating the equations, the constants are values given according to the design specification, and can be changed according to the design specification.

[표 1]TABLE 1

Figure 112009067854216-PAT00006
Figure 112009067854216-PAT00006

도 3은 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템의 열화도를 판단하는 순서도이다.3 is a flow chart for determining the degree of degradation of the deterioration degree determination system of the oxidation catalyst according to an embodiment of the present invention.

도 3을 참조하면, 산화촉매의 열화도 판단시스템은 제1단계(S1), 제2단계(S2), 제3단계(S3), 제4단계(S4), 제5단계(S5), 및 제6단계(S6)를 포함하고, 상 기 제어부(140)는 상기 각 단계에 필요한 일련의 명령 또는 프로그램을 포함한다.Referring to FIG. 3, the deterioration determination system of the oxidation catalyst includes a first step S1, a second step S2, a third step S3, a fourth step S4, a fifth step S5, and Including the sixth step (S6), the control unit 140 includes a series of commands or programs required for each step.

상기 제1단계(S1)에서, 상기 산화촉매(130)로 유입되는 실제유입온도가 측정된다. 상기 실제유입온도는 상기 제2센서(S2)에 의해서 감지된다.In the first step (S1), the actual inlet temperature flowing into the oxidation catalyst 130 is measured. The actual inflow temperature is sensed by the second sensor S2.

상기 제2단계(S2)에서, 상기 산화촉매(130)에서 유출되는 실제유출온도가 측정되고, 상기 실제유출온도는 상기 제3센서(S3)에 의해서 감지된다.In the second step (S2), the actual outflow temperature flowing out of the oxidation catalyst 130 is measured, the actual outflow temperature is sensed by the third sensor (S3).

상기 제3단계(S3) 및 상기 제4단계(S4)에서, 상기 수식들을 이용하여 상기 산화촉매(130)의 담체온도와 내부가스온도가 연산되고, 이들을 이용하여 상기 산화촉매(130)에서 유출되는 이론유출온도가 연산된다.In the third step (S3) and the fourth step (S4), the carrier temperature and the internal gas temperature of the oxidation catalyst 130 is calculated by using the equations, and outflow from the oxidation catalyst 130 using them. The theoretical outflow temperature is calculated.

상기 제5단계(S5)에서, 상기 이론유출온도와 상기 실제유출온도가 비교되고, 그 차이값이 연산되고, 상기 제6단계(S6)에서 상기 차이값의 크기에 따라서 상기 산화촉매(130)의 열화도가 판단된다.In the fifth step (S5), the theoretical outflow temperature and the actual outflow temperature is compared, the difference value is calculated, and in the sixth step (S6) the oxidation catalyst 130 according to the magnitude of the difference value Deterioration degree of is determined.

상기 차이값이 설정된 값보다 작으면, 상기 산화촉매의 산화환원기능이 떨어진 것이므로 열화도가 큰 것으로 판단하고, 상기 차이값이 설정된 값보다 크면, 상기 산화촉매의 산화환원기능이 높은 것으로 열화도가 낮은 것으로 판단된다.If the difference value is smaller than the set value, it is determined that the oxidation reduction function of the oxidation catalyst has decreased, and if the difference value is larger than the set value, the deterioration degree is high because the oxidation reduction function of the oxidation catalyst is higher. It seems to be low.

본 발명의 실시예에서는, 산화촉매의 반응이 없는 경우의 배기가스 유출온도를 간단한 수식으로 연산하고, 그 이론유출온도와 실제유출온도를 비교함으로써 촉매의 열화도를 실시간으로 비교적 용이하게 판단한다.In the embodiment of the present invention, the degree of deterioration of the catalyst is relatively easily determined in real time by calculating the exhaust gas outlet temperature in the absence of the reaction of the oxidation catalyst by a simple equation and comparing the theoretical outlet temperature with the actual outlet temperature.

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 범 위의 모든 변경을 포함한다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art from the embodiments of the present invention. All changes in the scope deemed to be included.

도 1은 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템의 개략적인 구성도이다.1 is a schematic configuration diagram of a system for determining a deterioration degree of an oxidation catalyst according to an exemplary embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템의 개략적인 열전달 모델이다.2 is a schematic heat transfer model of a system for determining the deterioration degree of an oxidation catalyst according to an exemplary embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 산화촉매의 열화도 판단시스템의 열화도를 판단하는 순서도이다.3 is a flow chart for determining the degree of degradation of the deterioration degree determination system of the oxidation catalyst according to an embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

100: 흡기라인100: intake line

110: 엔진110: engine

120: 배기라인120: exhaust line

130: 산화촉매130: oxidation catalyst

140: 제어부(ECU140: control unit (ECU)

S1: 제1센서S1: first sensor

S2: 제2센서S2: second sensor

S3: 제3센서S3: third sensor

Claims (4)

산화촉매의 입구를 지나는 배기가스의 실제유입온도를 측정하는 실제유입온도측정단계;An actual inlet temperature measuring step of measuring an actual inlet temperature of the exhaust gas passing through the inlet of the oxidation catalyst; 상기 실제유입온도를 이용하여 상기 산화촉매를 지나는 이론내부가스의 온도를 연산하는 이론내부가스온도연산단계;A theoretical internal gas temperature calculation step of calculating a temperature of a theoretical internal gas passing through the oxidation catalyst using the actual inlet temperature; 상기 실제유입온도와 상기 이론내부가스온도를 이용하여 상기 산화촉매의 출구를 지나는 배기가스의 이론유출온도를 연산하는 이론유출온도연산단계;A theoretical outflow temperature calculating step of calculating a theoretical outflow temperature of the exhaust gas passing through the outlet of the oxidation catalyst using the actual inflow temperature and the theoretical internal gas temperature; 상기 산화촉매의 출구를 지나는 배기가스의 실제유출온도를 측정하는 실제유출온도측정단계;An actual outflow temperature measuring step of measuring an actual outflow temperature of the exhaust gas passing through the outlet of the oxidation catalyst; 상기 실제유출온도와 상기 이론유출온도의 차이값을 연산하는 차이값연산단계; 및A difference value calculation step of calculating a difference value between the actual outflow temperature and the theoretical outflow temperature; And 상기 차이값의 크기를 설정된 값과 비교하여 상기 산화촉매의 열화도를 판단하는 열화도판단단계; 를 포함하는 산화촉매의 열화도 판단방법.A deterioration determination step of determining a degree of deterioration of the oxidation catalyst by comparing the magnitude of the difference value with a set value; Degradation degree determination method of the oxidation catalyst comprising a. 제1 항에 있어서,According to claim 1, 상기 이론내부가스온도연산단계 또는 상기 이론유출온도연산단계에서,In the theoretical internal gas temperature operation step or the theoretical outflow temperature operation step, 상기 산화촉매의 산화반응열을 배제한 상태에서 상기 이론내부가스의 온도 및 상기 이론유출온도를 계산하는 것을 특징으로 하는 산화촉매의 열화도 판단방법.And calculating the temperature of the theoretical internal gas and the theoretical outflow temperature in a state in which the heat of oxidation of the oxidation catalyst is excluded. 제1 항에 있어서,According to claim 1, 상기 이론내부가스온도연산단계 또는 상기 이론유출온도연산단계에서,In the theoretical internal gas temperature operation step or the theoretical outflow temperature operation step, 상기 이론유출온도를 연산하기 위해서 배기가스의 유량을 감지하는 유량감지단계; 를 더 포함하고, A flow rate sensing step of sensing a flow rate of the exhaust gas to calculate the theoretical outflow temperature; More, 상기 유량감지단계에서,In the flow rate detection step, 엔진의 내부로 유입되는 유입공기유량을 이용하여 배기가스의 유량을 연산하는 것을 특징으로 하는 산화촉매의 열화도 판단방법.The deterioration degree of the oxidation catalyst, characterized in that for calculating the flow rate of the exhaust gas using the inlet air flow rate flowing into the engine. 배기라인에 설치된 산화촉매;An oxidation catalyst installed in the exhaust line; 상기 산화촉매의 입구 또는 출구에 배치되어 배기가스의 실제유입온도와 실제유출온도를 측정하는 유입온도센서 및 유출온도센서;An inlet temperature sensor and an outlet temperature sensor disposed at an inlet or outlet of the oxidation catalyst to measure an actual inlet temperature and an outlet temperature of exhaust gas; 엔진의 유입공기유량을 감지하는 유량센서; 및A flow sensor for detecting an inflow air flow rate of the engine; And 설정된 프로그램에 의해서 동작하여 상기 유입온도센서, 상기 유출온도센서, 및 상기 유량센서로부터 감지된 신호를 이용하여 상기 산화촉매의 열화도를 판단하는 제어부; 를 포함하되,A controller configured to determine a degree of deterioration of the oxidation catalyst using a signal sensed by the inlet temperature sensor, the outlet temperature sensor, and the flow sensor by operating a set program; Including, 상기 제어부는,The control unit, 제1항 내지 제4항 중 어느 한 항의 방법을 수행하기 위한 일련의 명령을 포함하는 것을 특징으로 하는 산화촉매의 열화도 판단시스템.A system for determining the degree of deterioration of an oxidation catalyst comprising a series of instructions for carrying out the method of any one of claims 1 to 4.
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Publication number Priority date Publication date Assignee Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210007636A (en) * 2019-07-12 2021-01-20 현대자동차주식회사 Apparatus for diagnosing deterioration of doc and method thereof

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