KR20100031328A - System for diagnosis oxygen sensor pollution of vehicle and method thereof - Google Patents

System for diagnosis oxygen sensor pollution of vehicle and method thereof Download PDF

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KR20100031328A
KR20100031328A KR1020080090365A KR20080090365A KR20100031328A KR 20100031328 A KR20100031328 A KR 20100031328A KR 1020080090365 A KR1020080090365 A KR 1020080090365A KR 20080090365 A KR20080090365 A KR 20080090365A KR 20100031328 A KR20100031328 A KR 20100031328A
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South Korea
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oxygen sensor
vehicle
contamination
diagnosis
activation counter
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KR1020080090365A
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Korean (ko)
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KR100999634B1 (en
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구본창
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현대자동차주식회사
기아자동차주식회사
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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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • 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
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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

Abstract

PURPOSE: A system for the pollution diagnosis of an oxygen sensor for a vehicle and a method thereof using activity counter are provided to diagnose a short circuit due to assembly defective. CONSTITUTION: A method for the pollution diagnosis of an oxygen sensor for a vehicle comprises following steps. In vehicle completely produced, basic malfunction of opening/short circuit of an oxygen sensor is diagnosed according to ignition on(S102,S104). A diagnosis completion bit is set up after the diagnosis of the opening/short circuit(S106). According to the engine start on, the fixed activated counter is reduced one by one.

Description

차량용 산소센서 오염 진단장치 및 방법{SYSTEM FOR DIAGNOSIS OXYGEN SENSOR POLLUTION OF VEHICLE AND METHOD THEREOF}Oxygen sensor pollution diagnosis device and method for vehicle {SYSTEM FOR DIAGNOSIS OXYGEN SENSOR POLLUTION OF VEHICLE AND METHOD THEREOF}

본 발명은 차량용 센서 진단장치에 관한 것으로, 더 상세하게는 산소센서의 오염진단에 활성카운터를 설정하여 조립 후 설정된 활성카운터의 횟수 동안 이물질이 타서 발생하는 유기화합물에 의한 오염에 대해서는 진단을 실행하지 않고, 조립 불량에 의한 단락 및 단선 고장에 대해서는 진단이 가능하도록 하는 차량용 산소센서 오염진단장치 및 방법에 관한 것이다.The present invention relates to a vehicle sensor diagnostic apparatus, and more particularly, does not perform a diagnosis on contamination by organic compounds generated by burning foreign matters during the set number of active counters by setting an active counter to contaminate diagnosis of an oxygen sensor. The present invention relates to a vehicle oxygen sensor contamination diagnosis apparatus and method for diagnosing a short circuit and a disconnection failure due to a poor assembly.

일반적으로, 산소센서는 배기가스에 포함된 CO, HC, NOx 등의 유해물질을 정화시키는 촉매의 전단 및 후단에 장착되어 배기가스에 포함된 산소농도를 검출하여 엔진제어수단에 공연비 제어의 신호로 제공한다.In general, the oxygen sensor is mounted on the front and rear ends of the catalyst for purifying the harmful substances such as CO, HC, NOx contained in the exhaust gas to detect the oxygen concentration contained in the exhaust gas as a signal of the air-fuel ratio control to the engine control means. to provide.

차량 생산라인에서 장착된 신품 촉매는 배기가스의 고온에 의해 촉매 안의 매트(Mat)가 연소되어 진한 HC를 발생시키며, 이에 따라 산소센서의 레퍼런스 에어 쳄버(Reference air chamber)에 유기화합물을 적재시켜 오염을 발생시키고, 이러한 상태는 충분한 마일리지가 쌓이기 전까지 지속적으로 유지된다.The new catalyst installed in the vehicle production line generates a rich HC by burning the mat in the catalyst due to the high temperature of the exhaust gas. Therefore, organic compounds are loaded into the reference air chamber of the oxygen sensor for contamination. This condition is maintained until sufficient mileage is accumulated.

플래너 타입의 산소센서는 레퍼런스 에어 쳄버 내의 산소농도가 외부보다 높 은 경우 농후(Rich)의 신호를 출력하고, 외부의 산소농도가 레퍼런스 에어 쳄버 보다 높은 경우에 희박(Lean)의 신호를 출력한다.The planar type oxygen sensor outputs a rich signal when the oxygen concentration in the reference air chamber is higher than the outside, and a lean signal when the oxygen concentration in the reference air chamber is higher than the reference air chamber.

엔진제어수단은 산소센서의 신호를 피드백 검출하여 공연비를 제어하며, 유기화합물의 적재에 의해 레퍼런스 에어 쳄버가 오염되어 설정된 시간 이상 희박 신호가 검출되면 산소센서와 단락 고장으로 판단한다.The engine control means detects a feedback signal from the oxygen sensor to control the air-fuel ratio. If the reference air chamber is contaminated by the loading of the organic compound and a lean signal is detected for a predetermined time or more, the engine control unit judges that the oxygen sensor and the short circuit failure.

플래너 타입의 산소센서에는 레퍼런스 에어 쳄버에 펌핑 전류(Pumping Current)를 흘려 유기화합물의 적재에 의한 오염을 재생시키는 기능이 적용되어 있다.The planar-type oxygen sensor has a function of regenerating pollution by loading organic compounds by flowing a pumping current to the reference air chamber.

그러나, 종래의 차량에서는 생산 초기 차량에서 발생되는 이물질의 연소에 의해 산소센서가 오염 것에 대하여 고장판단을 중지시키는 기능이 적용되어 있지 않아 산소센서의 단락 고장으로 감지하고 진단코드의 출력하는 오감지가 빈번하게 발생되는 단점이 있다.However, the conventional vehicle does not have a function to stop the oxygen sensor from being contaminated by the combustion of foreign substances generated in the vehicle at the beginning of production. Therefore, the sensor detects a short circuit failure of the oxygen sensor and outputs a diagnostic code frequently. There is a disadvantage that occurs.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 산소센서의 오염진단에 활성카운터를 설정하여 조립 후 설정된 일정횟수 동안 이물질이 타서 발생하는 유기화합물에 의한 오염에 대해서는 진단을 실행하지 않고, 조립 불량에 의한 단락 및 단선 고장에 대해서는 정상적인 진단이 가능하게 하는 것이다.The present invention has been invented to solve the above problems, the purpose is to set the active counter to the contamination diagnosis of the oxygen sensor and do not perform a diagnosis for contamination by organic compounds generated by burning foreign matters for a predetermined number of times after assembly. In addition, a short circuit and a disconnection failure by assembly failure can be normally diagnosed.

즉, 본 발명은 조립 불량에 의한 산소센서의 단락 및 단선 고장 진단을 완료한 다음 오염 진단이 실행되도록 한다.That is, the present invention allows the contamination diagnosis to be executed after completing the diagnosis of the short circuit and disconnection failure of the oxygen sensor due to assembly failure.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 차량용 산소센서 오염 진단장치는, 동력원인 엔진; 요구 토크량에 따라 공기량을 조정하는 스로틀 밸브; 배기가스를 정화하는 촉매; 공연비의 희박 및 농후를 검출하는 산소센서를 포함하며, 산소센서의 활성화 카운터가 설정되어 차량의 초기 시동 온에 따라 활성화 카운터를 감소시키며, 활성화 카운터가 유지되는 상태에서 산소센서의 오염진단을 금지하는 제어부를 포함한다.Oxygen sensor contamination diagnosis apparatus for a vehicle according to a feature of the present invention for realizing the above object, the engine as a power source; A throttle valve for adjusting the air amount according to the required torque amount; A catalyst for purifying exhaust gas; It includes an oxygen sensor for detecting the lean and rich air-fuel ratio, and the activation counter of the oxygen sensor is set to reduce the activation counter according to the initial start-up of the vehicle, and prohibits the contamination diagnosis of the oxygen sensor while the activation counter is maintained. It includes a control unit.

또한, 본 발명의 특징에 따른 차량용 산소센서 오염 진단방법은, 생산 완료 차량에서 이그니션 온에 따라 산소센서의 개방/단락에 대한 단순 고장을 진단하는 과정; 개방/단락의 고장 진단이 완료되면 진단 완료비트를 설정하고, 엔진 시동 온에 따라 설정된 활성화 카운터를 1회씩 감소시키는 과정; 활성화 카운터가 유지되는 상태에서 공연비의 희박이 설정된 기준값 이하로 일정시간 이상 유지되면 산소센서를 유기화합물의 적재 오염으로 판단하여 오염 고장 감지를 금지하는 과정을 포함한다. In addition, the vehicle oxygen sensor contamination diagnosis method according to a feature of the present invention, the process of diagnosing a simple failure for the open / short of the oxygen sensor according to the ignition on the production completion vehicle; Setting a diagnostic completion bit when the diagnosis of the open / short fault is completed, and decreasing the activation counter set once according to the engine start-up; If the lean of the air-fuel ratio is maintained for a predetermined time or less in the state that the activation counter is maintained for a predetermined time or more, it includes a process of prohibiting the detection of contamination failure by determining the oxygen sensor as a loading contamination of the organic compound.

전술한 구성에 의하여 본 발명은 차량의 생산 초기의 운행에서 발생되는 산소센서의 오염 오감지가 발생되지 않아 제품에 신뢰성을 제공한다.According to the above-described configuration, the present invention provides reliability to a product because no contamination erroneous detection of an oxygen sensor occurs during the initial production of the vehicle.

아래에서는 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상 세히 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 1은 본 발명의 실시예에 따른 차량용 산소센서 오염진단장치의 개략적인 구성을 도시한 도면이다.1 is a view showing a schematic configuration of a vehicle oxygen sensor contamination diagnosis apparatus according to an embodiment of the present invention.

본 발명은 엔진(10)과 ETC(20), 촉매(30), 제1산소센서(40), 제2산소센서(50) 및 제어부(60)를 포함한다.The present invention includes an engine 10, an ETC 20, a catalyst 30, a first oxygen sensor 40, a second oxygen sensor 50, and a controller 60.

엔진(10)은 동력원으로 흡기관(A)을 통해 인가되는 흡기공기와 운전조건에 따라 분사되는 연료가 혼합된 혼합기를 연소시켜 동력을 발생시킨다.The engine 10 generates power by burning a mixture of intake air applied through the intake pipe A as a power source and fuel injected according to operating conditions.

스로틀 밸브(20)는 흡기관(A)의 소정 위치에 장착되어 가속페달 혹은 ETC의 제어에 의해 작동되어 요구 토크량에 대응되는 흡기공기를 연소실에 공급한다.The throttle valve 20 is mounted at a predetermined position of the intake pipe A and operated under the control of an accelerator pedal or ETC to supply intake air corresponding to a required torque amount to the combustion chamber.

촉매(30)는 엔진(10)과 연결되는 배기관(B)의 소정 위치에 장착되어 배기가스에 포함된 유해가스를 정화시켜 에미션을 안정화시킨다.Catalyst 30 is mounted at a predetermined position of the exhaust pipe (B) connected to the engine 10 to purify the harmful gas contained in the exhaust gas to stabilize the emission.

제1산소센서(40)는 촉매(30)의 상류측에 장착되어 배기가스에 포함된 산소농도를 검출하여 희박 혹은 농후에 대한 공연비의 정보를 제어부(60)에 제공한다.The first oxygen sensor 40 is mounted upstream of the catalyst 30 to detect the oxygen concentration contained in the exhaust gas and provide the controller 60 with information on the air-fuel ratio for lean or rich.

제2산소센서(50)는 촉매(40)의 하류측에 장착되어 촉매(40)에 의해 정화된 배기가스에 포함된 산소농도를 검출하여 희박 혹은 농후에 대한 공연비의 정보를 제어부(60)에 제공한다.The second oxygen sensor 50 is mounted on the downstream side of the catalyst 40 and detects the oxygen concentration contained in the exhaust gas purified by the catalyst 40 to provide the controller 60 with information on the air-fuel ratio for lean or rich. to provide.

이하에서는 상기 제1산소센서(40)와 제2산소센서(50)를 편의상 "산소센서"라 통칭한다.Hereinafter, the first oxygen sensor 40 and the second oxygen sensor 50 are collectively referred to as "oxygen sensor".

제어부(60)는 운전자의 감가속 요구에 따라 엔진(10)의 출력을 제어함과 동시에 제1,2산소센서(40)(50)에서 피드백 검출되는 정보에 따라 공연비의 연소를 제어한다.The controller 60 controls the output of the engine 10 according to the deceleration request of the driver, and simultaneously controls the combustion of the air-fuel ratio according to the information detected by the first and second oxygen sensors 40 and 50.

상기 제어부(60)는 산소센서의 활성화 카운터가 설정되어 조립 생산된 차량의 초기 시동 온에 따라 활성화 카운터를 감소시키며, 활성화 카운터가 진행되는 상태에서는 산소센서의 단순한 조립불량에 의한 개방/고착 고장에 대해서는 정상적인 고장 진단을 실행하고, 이물질의 연소로 발생되는 유기화합물의 적재에 의한 산소센서의 오염에 대해서는 진단을 금지하여 산소센서의 오염에 대한 오감지가 발생되지 않도록 한다.The control unit 60 decreases the activation counter according to the initial start-up of the assembled vehicle by setting the activation counter of the oxygen sensor, and in the state where the activation counter is in progress, the opening / fixing failure due to the simple assembly failure of the oxygen sensor. In this case, normal failure diagnosis is carried out, and contamination of the oxygen sensor caused by the loading of organic compounds caused by the combustion of foreign matter is prohibited, so that false detection of contamination of the oxygen sensor is prevented from occurring.

상기 제어부(60)에 설정되는 활성화 카운터는 생산 차량의 초기에 이물질의 연소로 발생되는 유기화합물은 일정 주행기간이 경과하면 더 이상 발생되지 않아 산소센서의 오염을 발생시키지 않으므로, 상기 유기화합물의 발생되지 않는 주행기간을 적용하여 설정된다.The activation counter set in the control unit 60 does not generate any more organic compounds generated by the combustion of foreign substances in the initial stage of the production vehicle after a certain driving period, and thus does not cause contamination of the oxygen sensor. It is set by applying a driving period that does not.

상기 제어부(60)는 설정된 활성화 카운터에 대하여 엔진 시동이 온되는 경우 1회씩 카운터를 감소시키며, 설정된 활성화 카운터가 '0'이 되는 경우 산소센서에 대한 오염 감지를 정상적으로 실행한다.The controller 60 decrements the counter once when the engine is turned on with respect to the set activation counter, and normally detects the contamination of the oxygen sensor when the set activation counter becomes '0'.

예를 들어, 생산 차량의 초기에 활성화 카운터가 진행되는 상태에서 산소센서에서 설정된 전압(0.05V) 이하의 희박 공연비가 설정된 일정시간(5초) 이상 검출되는 경우 해당 산소센서는 유기화합물의 적재에 의한 오염으로 판단하여 오염 진 단을 실행하지 않는다.For example, when the lean air-fuel ratio below the voltage (0.05V) set by the oxygen sensor is detected for more than a predetermined time (5 seconds) while the activation counter is in progress in the initial stage of the production vehicle, the oxygen sensor may not load the organic compound. Do not conduct contamination diagnosis by judging by contamination.

또한, 제어부(60)는 산소센서에서 설정된 전압(0.45V) 이상의 값으로 희박 및 농후의 반전이 검출되면 산소센서에 오염이 발생되지 않아 정상적으로 동작되는 것으로 판정하여 오염진단 금지를 해제하고 정상적인 오염 감지를 실행한다.In addition, the control unit 60 determines that the oxygen sensor does not operate normally when contamination and lean rich reversal are detected at a value higher than the voltage (0.45V) set by the oxygen sensor. Run

전술한 바와 같은 기능이 포함되는 본 발명의 동작은 다음과 같다.The operation of the present invention including the functions as described above is as follows.

생산 라인에서 차량의 조립이 완료되면 제어부(50)에는 산소센서 오염 오감지를 방지하기 위한 활성화 카운터가 설정된다(S101).When the assembly of the vehicle is completed in the production line, the control unit 50 is set to the activation counter for preventing the oxygen sensor contamination false detection (S101).

상기 활성화 카운터는 설계에 따라 가변되며, 대략적으로 20회로 설정한다.The activation counter varies depending on the design and is set approximately 20 times.

이후, 이그니션 스위치의 온 점점이 검출되는지 판단하여(S102), 이그니션 온이 검출되면 산소센서의 신호를 검출하여(S103) 단순한 조립불량에 의한 개방 혹은 단락 고장을 진단한다(S104).Thereafter, it is determined whether the on / off of the ignition switch is detected (S102), and when the ignition on is detected, the signal of the oxygen sensor is detected (S103) to diagnose an open or short circuit failure due to a simple assembly failure (S104).

이후, 조립불량에 따른 개방 혹은 단락 고장의 진단이 완료되면 진단완료 비트를 설정하고(S106), 엔진의 시동 온이 검출되는지 판단한다(S107).Subsequently, when the diagnosis of the opening or short-circuit failure due to assembly failure is completed, the diagnosis completion bit is set (S106), and it is determined whether the start-up of the engine is detected (S107).

상기 S107에서 엔진의 시동 온이 검출되면 활성화 카운터를 1회 감소시키고(S108), 산소센서로부터 공연비의 희박 및 농후에 대한 신호를 검출한다(S109).When the start-up of the engine is detected in S107, the activation counter is decremented once (S108), and a signal for lean and rich air-fuel ratio is detected from the oxygen sensor (S109).

이때, 산소센서에서 검출되는 공연비의 희박 신호가 설정된 기준값, 예를 들어 0.05V 이하로 검출되는지 판단하며(S110), 설정된 기준값 이하이면 설정된 일정시간, 예를 들어 5초간 유지되는지 판단한다(S111).At this time, it is determined whether the lean signal of the air-fuel ratio detected by the oxygen sensor is detected to be less than the set reference value, for example, 0.05V (S110), and if it is less than the set reference value, it is determined whether it is maintained for a predetermined time, for example, 5 seconds (S111). .

상기 S111에서 산소센서에서 공연비의 희박 신호가 설정된 기준값 이하의 상태로 설정시간 이상 유지되면 엔진 시동에 따라 이물질의 연소에 의해 유기화합물 의 적재에 의한 산소센서의 오염으로 판단하고(S112), 산소센서의 오염에 대한 고장진단을 실행하지 않는다(S113).If the lean signal of the air-fuel ratio is kept below the set reference value in the oxygen sensor in S111 for more than a predetermined time, it is determined that the oxygen sensor is contaminated by the loading of organic compounds by the combustion of foreign matters according to the engine start (S112). Do not perform troubleshooting for contamination of the (S113).

이후, 엔진의 반복적인 시동 온에 따른 상기한 절차의 반복으로 활성화 카운터가 '0'로 되었는지를 판단한다(S114).Subsequently, it is determined whether the activation counter becomes '0' by repeating the above procedure according to the repeated start-up of the engine (S114).

상기 활성화 카운터가 '0'로 되었으면 산소센서의 정상적인 진단모드로 진입하고(S116), 산소센서로부터 출력되는 희박 및 농후에 대한 신호에 따라 정상적인 진단을 실행한다(S117).When the activation counter becomes '0', the device enters the normal diagnostic mode of the oxygen sensor (S116), and performs a normal diagnosis according to the signal for lean and rich output from the oxygen sensor (S117).

그러나, 상기 S114에서 활성화 카운터가 '0'으로 감소되지 않은 상태에서 정상적인 전압값이 출력되며, 희박 및 농후의 반전횟수가 설정횟수를 초과하면 오염 진단금지를 해제하고, 정상적인 감지 동작을 실행한다(S115).However, in S114, a normal voltage value is output in a state where the activation counter is not reduced to '0', and when the lean and rich inversion times exceed the set number, the contamination diagnosis prohibition is released and a normal detection operation is performed ( S115).

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 본 발명의 실시예에 따른 차량용 산소센서 오염진단장치의 개략적인 구성을 도시한 도면이다.1 is a view showing a schematic configuration of a vehicle oxygen sensor contamination diagnosis apparatus according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 차량용 산소센서 오염진단 절차를 도시한 흐름도이다.2 is a flowchart illustrating a pollution detection procedure for an oxygen sensor for 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>

10 : 엔진 20 : 스로틀 밸브10 engine 20 throttle valve

30 : 촉매 40 : 제1산소센서30 catalyst 40 first oxygen sensor

50 : 제2산소센서 60 : 제어부50: second oxygen sensor 60: control unit

Claims (8)

동력원인 엔진;Power source engine; 요구 토크량에 따라 공기량을 조정하는 스로틀 밸브;A throttle valve for adjusting the air amount according to the required torque amount; 배기가스를 정화하는 촉매;A catalyst for purifying exhaust gas; 공연비의 희박 및 농후를 검출하는 산소센서를 포함하며, Oxygen sensor for detecting the lean and rich air-fuel ratio, 산소센서의 활성화 카운터가 설정되어 차량의 초기 시동 온에 따라 활성화 카운터를 감소시키며, 활성화 카운터가 유지되는 상태에서 산소센서의 오염진단을 금지하는 제어부를 포함하는 차량용 산소센서 오염 진단장치.An oxygen sensor contamination diagnosis apparatus for a vehicle, comprising: a controller configured to set an activation counter of the oxygen sensor to decrease the activation counter according to the initial start-up of the vehicle, and prohibit contamination diagnosis of the oxygen sensor while the activation counter is maintained. 제1항에 있어서,The method of claim 1, 상기 제어부는 활성화 카운터가 유지되는 상태에서 산소센서의 단순한 조립불량에 의한 개방/고착 고장에 대해서는 정상적인 고장 진단을 실행하는 차량용 산소센서 오염 진단장치.The control unit is a vehicle oxygen sensor contamination diagnosis device for performing a normal failure diagnosis for the open / stuck failure due to a simple assembly of the oxygen sensor in the state that the activation counter is maintained. 제1항에 있어서,The method of claim 1, 상기 제어부는 활성화 카운터 유지되는 상태에서 산소센서의 희박 오염이 검출되면 이물질의 연소로 발생된 유기화합물의 적재에 의한 오염을 판단하여 오염 진단을 실행하지 않는 차량용 산소센서 오염 진단장치.The control unit is a vehicle oxygen sensor contamination diagnosis device that does not perform a contamination diagnosis by determining the contamination by the loading of the organic compound generated by the combustion of foreign matters when the lean contamination of the oxygen sensor is detected while the activation counter is maintained. 제1항에 있어서,The method of claim 1, 상기 제어부에 설정되는 활성화 카운터는 유기화합물의 발생되지 않는 주행기간이 적용되어 설정되는 차량용 산소센서 오염 진단장치.The activation counter set in the control unit is a vehicle oxygen sensor contamination diagnosis device is set by applying a driving period that does not generate organic compounds. 제1항에 있어서,The method of claim 1, 상기 제어부는 엔진 시동 온에 따라 활성화 카운터를 1회씩 카운터를 감소시키며, 활성화 카운터가 '0'이 되면 산소센서의 오염감지를 정상적으로 실행하는 차량용 산소센서 오염 진단장치.The control unit decrements the counter once by the activation counter according to the engine start-up, and when the activation counter is '0' oxygen sensor pollution diagnostic device for a vehicle to perform the pollution detection of the oxygen sensor normally. 제1항에 있어서,The method of claim 1, 상기 제어부 활성화 카운터가 유지되는 상태에서 공연비의 희박/농후 반전이 정상값으로 설정횟수 이상 검출되면 오염 감지를 정상적으로 실행하는 차량용 산소센서 오염 진단장치.Oxygen sensor contamination diagnosis device for a vehicle to perform a contamination detection normally when the lean / rich inversion of the air-fuel ratio is detected more than the set number of times in the state in which the control unit activation counter is maintained. 생산 완료 차량에서 이그니션 온에 따라 산소센서의 개방/단락에 대한 단순 고장을 진단하는 과정;Diagnosing a simple failure of an open / short of the oxygen sensor upon ignition on the finished vehicle; 개방/단락의 고장 진단이 완료되면 진단 완료비트를 설정하고, 엔진 시동 온에 따라 설정된 활성화 카운터를 1회씩 감소시키는 과정;Setting a diagnostic completion bit when the diagnosis of the open / short fault is completed, and decreasing the activation counter set once according to the engine start-up; 활성화 카운터가 유지되는 상태에서 공연비의 희박이 설정된 기준값 이하로 일정시간 이상 유지되면 산소센서를 유기화합물의 적재 오염으로 판단하여 오염 고 장 감지를 금지하는 과정;When the lean of the air-fuel ratio is maintained below a predetermined reference value for a predetermined time while the activation counter is maintained, judging the oxygen sensor as loading pollution of the organic compound and prohibiting the detection of contamination failure; 을 포함하는 차량용 산소센서 오염 진단방법. Vehicle oxygen sensor contamination diagnostic method comprising a. 제7항에 있어서,The method of claim 7, wherein 상기 활성화 카운터가 유지되는 상태에서 산소센서로부터 공연비의 희박/농후가 정상 전압으로 설정횟수 이상 검출되면 오염 고장 감지를 해제하고 정상적인 고장 감지를 실행하는 차량용 산소센서 오염 진단방법. If the lean / rich air-fuel ratio is detected from the oxygen sensor to the normal voltage more than the set number of times in the state that the activation counter is maintained, the vehicle oxygen sensor pollution diagnosis method for canceling the pollution failure detection and performs a normal failure detection.
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DE102012013781A1 (en) * 2012-07-11 2014-04-24 Volkswagen Aktiengesellschaft Method for qualifying sensor measuring signal of sensor in exhaust gas system of internal combustion engine of motor vehicle, involves detecting sensor measuring signal and applying plausibility check on sensor measurement signal
KR101637829B1 (en) * 2015-04-23 2016-07-21 현대자동차주식회사 Method for controlling hybrid vehicle

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JPH1018886A (en) 1996-07-05 1998-01-20 Mazda Motor Corp O2-sensor degradation detection method and device for the same
KR100552791B1 (en) 2004-07-01 2006-02-21 현대자동차주식회사 method for checking rationality of O2 sensor in OBD system
JP4403156B2 (en) 2006-08-09 2010-01-20 株式会社日立製作所 Oxygen sensor diagnostic device for internal combustion engine
JP4251216B2 (en) 2007-01-12 2009-04-08 トヨタ自動車株式会社 Oxygen sensor abnormality diagnosis device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013781A1 (en) * 2012-07-11 2014-04-24 Volkswagen Aktiengesellschaft Method for qualifying sensor measuring signal of sensor in exhaust gas system of internal combustion engine of motor vehicle, involves detecting sensor measuring signal and applying plausibility check on sensor measurement signal
DE102012013781B4 (en) * 2012-07-11 2017-12-28 Volkswagen Aktiengesellschaft Method and device for qualifying a sensor measuring signal
KR101637829B1 (en) * 2015-04-23 2016-07-21 현대자동차주식회사 Method for controlling hybrid vehicle

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