KR100298719B1 - Method for determining catalyst disorder - Google Patents

Method for determining catalyst disorder Download PDF

Info

Publication number
KR100298719B1
KR100298719B1 KR1019970066158A KR19970066158A KR100298719B1 KR 100298719 B1 KR100298719 B1 KR 100298719B1 KR 1019970066158 A KR1019970066158 A KR 1019970066158A KR 19970066158 A KR19970066158 A KR 19970066158A KR 100298719 B1 KR100298719 B1 KR 100298719B1
Authority
KR
South Korea
Prior art keywords
catalyst
oxygen sensor
signal
oxygen
calculated
Prior art date
Application number
KR1019970066158A
Other languages
Korean (ko)
Other versions
KR19990047654A (en
Inventor
한승국
Original Assignee
이계안
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 이계안, 현대자동차주식회사 filed Critical 이계안
Priority to KR1019970066158A priority Critical patent/KR100298719B1/en
Publication of KR19990047654A publication Critical patent/KR19990047654A/en
Application granted granted Critical
Publication of KR100298719B1 publication Critical patent/KR100298719B1/en

Links

Images

Classifications

    • 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
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind

Landscapes

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

Abstract

PURPOSE: A normal operation of a catalyst is determined by catalyst deterioration index calculated by an areal integration of signal of a thermal oxygen sensor. Misjudgment by abrupt fluid change is prevented. CONSTITUTION: A device for determining catalyst disorder comprises a first oxygen sensor(11), a second oxygen sensor(12), and an ECU(20). The first oxygen sensor(11) is installed in a front side of the catalyst. The first oxygen sensor(11) senses the oxygen density in a discharge gas, and outputs a corresponding signal. The second oxygen sensor(12) is installed in a rear side of the catalyst. The second oxygen sensor(12) detects oxygen density in a discharge gas which is filtered by the catalyst, and outputs a corresponding signal. An ECU(20) area-integrates the signal of the first oxygen sensor(11) and the second oxygen sensor(12) to calculate a catalyst deterioration index.

Description

촉매 고장진단 방법Catalyst failure diagnosis method

본 발명은 자동차의 촉매 고장진단 방법에 관한 것으로, 더욱 상세하게는 듀얼 산소 센서의 신호를 구간적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상작동 여부를 판단함으로써 급격한 유량 변화에 의한 오판정을 미연에 방지하도록 한 촉매 고장진단 방법에 관한 것이다.The present invention relates to a method for diagnosing catalyst failure in automobiles, and more particularly, by determining whether the catalyst is operating normally according to the catalyst deterioration index calculated by the interval integration of the signals of the dual oxygen sensor, the misjudgment caused by the rapid flow rate change is not disclosed. The present invention relates to a catalyst failure diagnosis method.

현재의 자동차용 원동기로 사용하는 가솔린 기관을 비롯한 내연기관은 연료를 실린더 안에서 연소시켜 이때 발생하는 열에너지를 동력으로 이용하고 있다.Internal combustion engines, including gasoline engines, which are currently used as automotive prime movers, burn fuel in a cylinder and use thermal energy generated at this time as power.

따라서 그 배기가스에는 연소에 따른 질소 산화물과, 불완전 연소로 인한 일산화탄소 또는 탄화수소등 유해한 성분이 함유되어 있다.Therefore, the exhaust gas contains harmful components such as nitrogen oxides due to combustion and carbon monoxide or hydrocarbons due to incomplete combustion.

이와 같은 배기가스에 의한 대기 오염은 오늘날 커다란 사회 문제로 되어 그에 대한 대책이 강구되고 있다.The air pollution caused by the exhaust gas is a big social problem today, and the countermeasures have been taken.

이러한 대책의 일환으로 배기가스중의 유해 성분을 정화하기 위하여 차량에는 촉매가 설치되어 있다.As part of these measures, the vehicle is equipped with a catalyst to purify the harmful components in the exhaust gas.

촉매는 배기가스가 농후할 경우 흡착되어 있는 산소를 방출하여 배기가스중의 유해 물질을 산화시켜 배기가스를 저감시키는 것으로, 촉매의 정상작동 여부를 판단하는 기본적인 방법은 촉매의 산소저장능력이라는 특징을 이용하는 것이다.When the exhaust gas is rich, the catalyst releases the adsorbed oxygen to oxidize harmful substances in the exhaust gas to reduce the exhaust gas. The basic method for determining the normal operation of the catalyst is the oxygen storage capacity of the catalyst. It is to use.

상기와 같은 촉매의 산소저장능력에 따라 촉매의 정상동작여부를 판단하는 종래의 방법을 첨부된 도 4 를 참조로 하여 설명하면 다음과 같다.A conventional method for determining whether the catalyst is normally operated according to the oxygen storage capacity of the catalyst as described above will be described with reference to FIG. 4.

차량의 운행중 검출된 촉매 전후방의 산소 센서 신호를 이용하여 촉매 전방의 산소 센서 신호의 최고값과 최소값에 따른 진폭( PU )과 촉매 후방의 산소 센서 신호의 최고값과 최소값에 따른 진폭( PD )을 각각 검출하여 다음과 같이 촉매 열화지수를 연산한다.By using the oxygen sensor signals before and after the catalyst detected while the vehicle is running, the amplitude according to the maximum and minimum values of the oxygen sensor signal P U ) And the amplitude according to the maximum and minimum values of the oxygen sensor signal P D ) And calculate the catalyst deterioration index as follows.

Figure 1019970066158_B1_M0001
Figure 1019970066158_B1_M0001

이후, 상기에서 연산된 촉매 열화지수를 기준값과 비교하여 기준값 이상이면 촉매가 고장 또는 열화되었다고 판단한다.Thereafter, the catalyst degradation index calculated above is compared with the reference value, and if the reference value is higher than, it is determined that the catalyst has failed or degraded.

전술한 바와 같은 종래의 방법에서는 배기가스의 급격한 유량 증가가 있을 경우에는 촉매가 이를 감당하지 못하여 촉매 후방의 산소센서 신호값이 급격히 증가되므로 이때의 촉매 열화지수에 따라 고장 판단을 하는 등의 오판정을 하는 문제점이 있었다.In the conventional method as described above, if there is a sudden increase in the flow rate of the exhaust gas, the catalyst cannot handle it, and the oxygen sensor signal value of the rear of the catalyst increases rapidly. There was a problem doing.

본 발명은 이와 같은 문제점을 해결하기 위하여 안출한 것으로, 그 목적은 듀얼 산소 센서의 신호를 구간적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상작동 여부를 판단함으로써 급격한 유량 변화에 의한 오판정을 미연에 방지할 수 있는 촉매 고장진단 방법을 제공하는 데 있다.The present invention has been made to solve the above problems, the object of which is to determine whether the normal operation of the catalyst according to the catalyst degradation index calculated by the interval integration of the signal of the dual-oxygen sensor to delay the misjudgment caused by the rapid flow rate change The present invention provides a method for diagnosing catalyst failure that can be prevented.

상기와 같은 목적을 달성하기 위하여 본 발명은, 차량의 운행중 검출되는 듀얼 산소 센서의 신호를 전파 정류하여 구간적분을 하는 단계와;In order to achieve the above object, the present invention comprises the steps of performing a period integration by full-wave rectifying the signal of the dual oxygen sensor detected during the operation of the vehicle;

상기 단계에서 적분된 각각의 산소 센서값에 따라 촉매의 열화지수를 연산하여 촉매 고장 판정을 위해 설정된 기준값과 비교하는 단계와;Calculating a deterioration index of the catalyst according to each oxygen sensor value integrated in the step and comparing it with a reference value set for catalyst failure determination;

상기 단계에서 연산된 촉매 열화지수가 설정된 기준값보다 클 경우에는 촉매 고장 판정을 하며, 연산된 촉매 열화지수가 설정된 기준값보다 작을 경우에는 촉매 정상 판정을 하는 단계로 이루어지는 것을 특징으로 한다.The catalyst failure determination is performed when the catalyst degradation index calculated in the above step is larger than the set reference value, and the catalyst normal determination is performed when the calculated catalyst degradation index is smaller than the set reference value.

도 1 은 본 발명에 따른 장치를 도시한 개략 구성도이고,1 is a schematic structural diagram showing an apparatus according to the present invention,

도 2 는 본 발명에 따른 일 실시예를 개략적으로 도시한 동작 순서도이고,2 is an operational flowchart schematically showing an embodiment according to the present invention;

도 3 은 본 발명에 따른 고장진단 과정을 개략적으로 도시한 신호 파형도이고,3 is a signal waveform diagram schematically showing a fault diagnosis process according to the present invention;

도 4 는 종래의 방법에 따른 고장진단 과정을 개략적으로 도시한 신호 파형도이다.4 is a signal waveform diagram schematically illustrating a failure diagnosis process according to a conventional method.

이하, 첨부된 도면을 참조로 하여 본 발명에 따른 바람직한 일 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1 에서 알 수 있는 바와 같이 본 발명에 따른 장치는 제 1 산소 센서(11)와, 제 2 산소 센서(12), ECU(20)로 이루어진다.As can be seen in FIG. 1, the device according to the invention comprises a first oxygen sensor 11, a second oxygen sensor 12, and an ECU 20.

제 1 산소 센서(11)는 촉매 전방에 설치되며, 엔진에서 배출되는 배기가스중에 포함되어 있는 산소농도를 검출하여 그에 따른 소정의 신호를 출력한다.The first oxygen sensor 11 is installed in front of the catalyst, detects the oxygen concentration contained in the exhaust gas discharged from the engine and outputs a predetermined signal accordingly.

제 2 산소 센서(12)는 촉매 후방에 설치되며, 촉매에서 정화된 배기가스중에 포함되어 있는 산소농도를 검출하여 그에 따른 소정의 신호를 출력한다.The second oxygen sensor 12 is installed behind the catalyst and detects the oxygen concentration contained in the exhaust gas purified by the catalyst and outputs a predetermined signal accordingly.

ECU(20)는 상기 제 1 산소 센서(11)와 제 2 산소 센서(12)의 신호를 구간적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상작동여부를 판단한다.The ECU 20 determines whether the catalyst is in normal operation according to the catalyst deterioration index calculated by the interval integration of the signals of the first oxygen sensor 11 and the second oxygen sensor 12.

상기와 같이 구성된 장치에 의거하여 본 발명인 촉매 고장진단 방법을 첨부된 도면을 참조로 하여 상세히 설명하면 다음과 같다.When the catalyst failure diagnosis method of the present invention based on the device configured as described above with reference to the accompanying drawings in detail as follows.

차량의 운행중 ECU(20)는 엔진측에서 배출되는 배기가스중에 포함된 산소농도와 엔진측에서 배출되어 촉매에서 정화된 배출가스중에 포함된 산소농도에 따라 도 3 의 (a)와 같은 신호를 출력하는 제 1 산소 센서(11) 및 제 2 산소 센서(12)의 신호를 검출한(S10) 다음 도 3 의 (b)와 같이 전파 정류를 한다(S20).During operation of the vehicle, the ECU 20 outputs a signal as shown in FIG. 3A according to the oxygen concentration contained in the exhaust gas discharged from the engine side and the oxygen concentration contained in the exhaust gas discharged from the engine side and purified from the catalyst. The signals of the first oxygen sensor 11 and the second oxygen sensor 12 are detected (S10), and then full-wave rectification is performed as shown in FIG. 3B (S20).

그러면 ECU(20)는 상기에서 전파 정류된 신호를 도 3 의 (c)와 같이 일정 시간 동안의 구간적분을 하여(S30) 상기 제 1 산소 센서(11) 신호의 적분값( IU )과 제 2 산소 센서(12) 신호의 적분값( ID )을 연산한다.Then, the ECU 20 performs the interval integration for a predetermined time period as shown in (c) of FIG. I U ) And the integral value of the signal of the second oxygen sensor 12 ( I D ) Is calculated.

이후, 상기에서 구간 적분된 제 1 산소 센서(11) 적분값( IU )과 제 2 산소 센서(12) 적분값( ID )을 이용하여 다음과 같이 촉매 열화지수를 연산한다(S40).Thereafter, the integral value of the first oxygen sensor 11 integrated in the above section ( I U ) And the integral value of the second oxygen sensor 12 ( I D Calculate the catalyst degradation index as follows (S40).

Figure 1019970066158_B1_M0002
Figure 1019970066158_B1_M0002

그러면 ECU(20)는 상기에서 연산된 촉매 열화지수를 기준값과 비교하여(S50) 연산된 촉매 열화지수가 기준값보다 클 경우에는 촉매가 고장 또는 열화되었다고 판단하고(S60), 연산된 촉매 열화지수가 기준값보다 작을 경우에는 촉매가 정상작동을 하는 것으로 판단(S70)한다.Then, the ECU 20 compares the calculated catalyst deterioration index with the reference value (S50), and if the calculated catalyst deterioration index is larger than the reference value, the ECU 20 determines that the catalyst has failed or deteriorated (S60), and the calculated catalyst deterioration index is determined. If it is smaller than the reference value, it is determined that the catalyst is operating normally (S70).

이와 같이 본 발명은 듀얼 산소 센서의 신호를 구간적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상작동 여부를 판단함으로써 급격한 유량 변화에 의한 오판정을 미연에 방지할 수 있을 뿐만 아니라 정밀도가 높은 열화지수를 구할 수 있으며 각종 노이즈에 의한 영향을 최소화할 수 있다.As described above, the present invention not only prevents misjudgment caused by rapid flow rate change but also determines the normal operation of the catalyst according to the catalyst deterioration index calculated by the interval integration of the signal of the dual oxygen sensor. Can be obtained and the influence of various noises can be minimized.

Claims (2)

차량의 촉매 고장진단 방법에 있어서, 차량의 운행중 검출되는 듀얼 산소 센서의 신호를 전파 정류하여 구간적분을 하는 단계와;A catalyst failure diagnosis method of a vehicle, the method comprising: performing a period integration by full-wave rectifying a signal of a dual oxygen sensor detected while driving a vehicle; 상기 단계에서 적분된 각각의 산소 센서값에 따라 촉매의 열화지수를 연산하여 촉매 고장 판정을 위해 설정된 기준값과 비교하는 단계와;Calculating a deterioration index of the catalyst according to each oxygen sensor value integrated in the step and comparing it with a reference value set for catalyst failure determination; 상기 단계에서 연산된 촉매 열화지수가 설정된 기준값보다 클 경우에는 촉매 고장 판정을 하며, 연산된 촉매 열화지수가 설정된 기준값보다 작을 경우에는 촉매 정상 판정을 하는 단계로 이루어지는 것을 특징으로 하는 촉매 고장진단 방법.And a catalyst failure determination when the calculated catalyst deterioration index is larger than the set reference value, and a catalyst normal determination when the calculated catalyst deterioration index is smaller than the set reference value. 청구항 1 에 있어서, 상기 단계에서 촉매 열화지수는 다음과 같이 연산하는 것을 특징으로 하는 촉매 고장진단 방법.The method of claim 1, wherein the catalyst degradation index in the step is calculated as follows.
Figure 1019970066158_B1_M0002
Figure 1019970066158_B1_M0002
 상기에서 IU 는 촉매 전방에 설치되어 촉매에서 정화되기 전의 배기가스중에 포함되어 있는 산소 농도를 검출하는 산소 센서의 신호를 적분한 값이고, ID 는 촉매 후방에 설치되어 촉매에서 정화된 배기가스중에 포함되어 있는 신소 농도를 검출하는 산소 센서의 신호를 적분한 값이다.From above I U Is a value obtained by integrating a signal of an oxygen sensor installed in front of the catalyst to detect the oxygen concentration contained in the exhaust gas before being purified by the catalyst, I D Is a value obtained by integrating a signal of an oxygen sensor which is installed behind the catalyst and detects the concentration of oxygen contained in the exhaust gas purified from the catalyst.
KR1019970066158A 1997-12-05 1997-12-05 Method for determining catalyst disorder KR100298719B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019970066158A KR100298719B1 (en) 1997-12-05 1997-12-05 Method for determining catalyst disorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019970066158A KR100298719B1 (en) 1997-12-05 1997-12-05 Method for determining catalyst disorder

Publications (2)

Publication Number Publication Date
KR19990047654A KR19990047654A (en) 1999-07-05
KR100298719B1 true KR100298719B1 (en) 2001-09-03

Family

ID=37528541

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019970066158A KR100298719B1 (en) 1997-12-05 1997-12-05 Method for determining catalyst disorder

Country Status (1)

Country Link
KR (1) KR100298719B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101338558B1 (en) * 2007-12-17 2013-12-06 현대자동차주식회사 Method for prevention diagnosis of catalyst monitoring using a p-jump delay learning

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100354031B1 (en) * 2000-07-21 2002-09-27 현대자동차주식회사 A method for monitoring catalytic of vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210126A (en) * 1995-10-27 1996-08-20 Toyota Motor Corp Catalytic deterioration discriminating device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08210126A (en) * 1995-10-27 1996-08-20 Toyota Motor Corp Catalytic deterioration discriminating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101338558B1 (en) * 2007-12-17 2013-12-06 현대자동차주식회사 Method for prevention diagnosis of catalyst monitoring using a p-jump delay learning

Also Published As

Publication number Publication date
KR19990047654A (en) 1999-07-05

Similar Documents

Publication Publication Date Title
US6588251B2 (en) Method for checking the dynamic behavior of a measuring sensor in the exhaust tract of an internal combustion engine
US6408615B1 (en) Method for controlling an NOx accumulating catalytic converter
JP4500359B2 (en) Method for diagnosing presence of exhaust gas after-treatment device and use of on-board diagnostic technology
US6502386B1 (en) Catalyst monitoring in a diesel engine
US5553450A (en) Method and apparatus for judging the functioning of a catalytic converter
US5351484A (en) Light-off catalyst monitor
US5732549A (en) Method for checking the conversion capability of a catalytic converter
US7784275B2 (en) Optimization of hydrocarbon injection during diesel particulate filter (DPF) regeneration
JP4688935B2 (en) How to identify the threshold of exhaust pollutant gas to control the operation of the car in "stop and start" mode
WO2016035498A1 (en) Engine control apparatus
US6425242B2 (en) Diagnostic system for monitoring catalyst operation using arc length ratio
KR100298719B1 (en) Method for determining catalyst disorder
GB2411008A (en) Diagnostic process for condition of catalytic converter system
KR20190134944A (en) Exhaust gas purification system and the control method thereof
JPH09144531A (en) Device and method for supervising exhaust emission control system
KR20070062309A (en) Diesel catalyze particulate filter diagnosis system of diesel vehicle and method thereof
US8312707B2 (en) Method for operating an exhaust-gas catalytic converter of an internal combustion engine
JP4510709B2 (en) Catalyst deterioration judgment device
KR102417343B1 (en) Exhaust gas post processing system and control method thereof
CN112392622A (en) Engine operation mode switching control method and device and vehicle
KR100570049B1 (en) Control method to remove particulate matter
JP2008231951A (en) Engine exhaust emission temperature estimation device and engine exhaust emission control device
KR100219203B1 (en) Failure detecting method of feedback control for oxygen sensor
KR20050071097A (en) Regeneration method of diesel particulate filter
KR101480566B1 (en) diagnosing method and apparatus of catalyst deterioration of a car

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20060601

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee