KR101338669B1 - Monitoring method for catalyst of sooty filtering apparatus - Google Patents

Monitoring method for catalyst of sooty filtering apparatus Download PDF

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KR101338669B1
KR101338669B1 KR1020070127762A KR20070127762A KR101338669B1 KR 101338669 B1 KR101338669 B1 KR 101338669B1 KR 1020070127762 A KR1020070127762 A KR 1020070127762A KR 20070127762 A KR20070127762 A KR 20070127762A KR 101338669 B1 KR101338669 B1 KR 101338669B1
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catalyst
oxygen sensor
amount
filtration device
intake air
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KR1020070127762A
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Korean (ko)
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KR20090060823A (en
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구유선
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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

Abstract

본 발명은 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량을 린 상태에서 리치 상태로 변화시키면서 실시하지 않고, 매연 여과 장치의 촉매 모니터링을 흡입 공기량이 린 상태에서 리치 상태로 변화되는 DFCO(Deceleration Fuel Cut-Off)가 실시되는 구간에서 실시하는 매연 여과 장치의 촉매 모니터링 방법에 관한 것이다.The present invention does not deliberately change the intake air amount from the lean state to the rich state during idle for catalyst monitoring of the soot filtration device, and performs the catalyst monitoring of the soot filter device from the lean state to the rich state. It relates to a catalyst monitoring method of a soot filtration device performed in a section in which Deceleration Fuel Cut-Off) is performed.

촉매, 모니터링, 전방/후방 산소센서, 아이들, Fuel Cut-Off, Catalyst, Monitoring, Front / Rear Oxygen Sensor, Idle, Fuel Cut-Off,

Description

매연 여과 장치의 촉매 모니터링 방법{Monitoring method for catalyst of sooty filtering apparatus}Monitoring method for catalyst of sooty filtering apparatus

본 발명은 매연 여과 장치의 촉매 모니터링 방법에 관한 것으로, 특히 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량을 린 상태에서 리치 상태로 변화시키면서 실시하지 않고, 매연 여과 장치의 촉매 모니터링을 흡입 공기량이 린 상태에서 리치 상태로 변화되는 DFCO(Deceleration Fuel Cut-Off)가 실시되는 구간에서 실시하는 매연 여과 장치의 촉매 모니터링 방법에 관한 것이다.The present invention relates to a catalyst monitoring method of a soot filtration device, and in particular, in order to monitor the catalyst of the soot filtration device, the catalyst monitoring of the soot filtration device is inhaled without changing the intake air amount from the lean state to the rich state at idle. The present invention relates to a catalyst monitoring method of a soot filtration device which is performed in a section in which a DFCO (Deceleration Fuel Cut-Off) is performed in which the air amount is changed from a lean state to a rich state.

배출가스 자가진단장치(OBD)에서, 매연 여과 장치의 촉매 모니터링은 촉매 안에 포함된 셀슘 산화물이 산소를 흡착하는 원리를 이용하여, 터보차져 전단에 장착된 전방 산소센서와 매연 여과 장치 후단에 장착된 후방 산소센서가 감지하는 산소량의 차이를 이용하여 매연 여과 장치의 촉매의 산화 정도를 모니터링한다.In the exhaust gas self-diagnosis device (OBD), catalyst monitoring of the soot filtration unit is based on the principle of adsorption of oxygen by the cesium oxide contained in the catalyst. The difference in the amount of oxygen detected by the rear oxygen sensor is used to monitor the oxidation of the catalyst in the soot filtration system.

이러한 종래의 매연 여과 장치의 촉매 모니터링은 매연 여과 장치의 촉매 모 니터링을 위하여 일부러 아이들(idle)시 흡입 공기량(A/F)을 린(lean) 상태에서 리치(rich) 상태로 변화시키면서 전방 산소센서와 후방 산소센서의 산소량을 비교하여 실시한다.The catalyst monitoring of the conventional particulate filter has a front oxygen sensor while deliberately changing the intake air amount (A / F) from the lean state to the rich state during idle for catalytic monitoring of the particulate filter. Compare the amount of oxygen in the oxygen sensor with the rear oxygen sensor.

즉, 종래의 매연 여과 장치의 촉매 모니터링은 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량을 린 상태에서 리치 상태로 변화시켜야 하는 번거로움이 있다.That is, in the conventional catalyst monitoring of the particulate filter, it is cumbersome to intentionally change the amount of intake air from a lean state to a rich state for idle monitoring.

한편, 흡입 공기량을 린한 상태로 하였을 때 운전자가 발진을 시도하면, NOx가 방출되거나 발진성이 떨어지데, 종래의 매연 여과 장치의 촉매 모니터링은 매연 여과 장치의 촉매 모니터링을 위하여 아이들시 흡입 공기량을 린한 상태로 함에 따라, 여과 장치의 촉매 모니터링을 위하여 아이들시 흡입 공기량을 린한 상태로 하였을 때 운전자가 발진을 시도하면, NOx가 방출되도록 하거나 발진성을 떨어뜨린다는 단점이 있다.On the other hand, if the driver attempts to oscillate when the intake air amount is in a lean state, NOx is released or the oscillation property is lowered. The conventional catalyst monitoring of the soot filtration device uses a lean intake air amount when idle for the catalyst monitoring of the soot filtration device. As a state, when the driver attempts to oscillate when the amount of intake air is lean when idle for the catalyst monitoring of the filtration device, NOx is released or the oscillation property is deteriorated.

따라서, 본 발명의 목적은 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량을 린 상태에서 리치 상태로 변화시키면서 실시하지 않고, 매연 여과 장치의 촉매 모니터링을 흡입 공기량이 린 상태에서 리치 상태로 변화되는 DFCO가 실시되는 구간에서 실시하는 매연 여과 장치의 촉매 모니터링 방법을 제공하는 것이다.Therefore, an object of the present invention is not carried out while deliberately changing the intake air amount from the lean state to the rich state during idle for catalyst monitoring of the soot filtration device, and the catalyst monitoring of the soot filtration device from the lean state to the rich state. It is to provide a catalyst monitoring method of the soot filtration device is carried out in the section in which the DFCO is changed.

상기의 목적을 달성하기 위하여, 본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법은 DFCO가 실시되는 단계와; 흡입 공기량이 린 상태가 되는 단계와; 전방 산소센서가 감지하는 산소량을 체크하는 단계와; 후방 산소센서가 감지하는 산소량을 체크하는 단계와; 상기 DFCO가 종료되는 단계와; 상기 전방 산소센서와 상기 후방 산소센서가 감지한 산소량의 차이를 이용하여 매연 여과 장치의 촉매의 산화 정도를 모니터링하는 단계를 포함한다.In order to achieve the above object, the catalyst monitoring method of the soot filtration device according to an embodiment of the present invention comprises the steps of performing DFCO; Making the intake air amount lean; Checking the amount of oxygen sensed by the front oxygen sensor; Checking the amount of oxygen sensed by the rear oxygen sensor; Terminating the DFCO; Monitoring the oxidation degree of the catalyst of the soot filtration device by using the difference in the amount of oxygen sensed by the front oxygen sensor and the rear oxygen sensor.

상기 매연 여과 장치의 촉매 모니터링 방법은 상기 DFCO가 종료되어 상기 흡입 공기량이 리치 상태가 된 것에 반응하는 상기 전방 산소센서의 반응시간을 확보하는 단계를 더 포함한다.The catalyst monitoring method of the particulate filter further includes the step of securing a reaction time of the front oxygen sensor responding that the DFCO is terminated and the intake air amount becomes rich.

상기 매연 여과 장치의 촉매 모니터링 방법은 상기 전방 산소센서가 감지한 산소량과 상기 후방 산소센서가 감지한 산소량을 적산하여 상기 매연 여과 장치의 촉매 모니터링을 실시하는 단계를 더 포함한다.The catalyst monitoring method of the particulate filter further includes the step of performing the catalyst monitoring of the particulate filter by integrating the amount of oxygen detected by the front oxygen sensor and the amount of oxygen detected by the rear oxygen sensor.

본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법은 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량을 린 상태에서 리치 상태로 변화시키면서 실시하지 않고, 매연 여과 장치의 촉매 모니터링을 흡입 공기량이 린 상태에서 리치 상태로 변화되는 DFCO가 실시되는 구간에서 실시한다. 이에 따라, 아이들시 흡입 공기량을 린 상태로 하지않음으로써 아이들시에 운전자가 발진을 시도하더라도 NOx가 방출되지 않으며, 아이들시에 발진성이 떨어지는 문제를 방지할 수 있다.In the catalyst monitoring method of the smoke filtration apparatus according to the embodiment of the present invention, the catalyst monitoring of the smoke filtration apparatus is not performed while deliberately changing the intake air amount from the lean state to the rich state for idle catalyst monitoring. It is carried out in the section where DFCO is carried out in which the air volume changes from a lean state to a rich state. Accordingly, since the amount of intake air during idle is not made lean, NOx is not emitted even when the driver attempts to oscillate during idle, thereby preventing the problem of poor oscillation during idle.

이하, 도 1 내지 도 3을 참조하여 본 발명의 바람직한 실시 예에 대하여 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 1 to 3.

먼저, 차량 ECU는 운전자가 브레이크 페달을 밟는다거나, 저단 기어를 사용하면 운전자에게 가속의지가 없는 것으로 판단하여 DFCO를 실시한다. DFCO가 실시되면 흡입 공기량은 린 상태가 된다. 그리고, DFCO가 종료되면 흡입 공기량은 이전 대비 리치 상태가 된다. 본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법은 상기와 같이 DFCO가 실시되면 흡입 공기량이 린 상태가 되며 DFCO가 종료되면 흡입 공기량이 리치 상태가 되는 것을 이용한다. First, the vehicle ECU performs DFCO by determining that the driver has no intention to accelerate when the driver presses the brake pedal or uses the lower gear. When DFCO is carried out, the intake air volume is lean. In addition, when the DFCO is completed, the intake air amount becomes rich compared to the previous state. In the catalyst monitoring method of the particulate filter according to the embodiment of the present invention, when the DFCO is performed as described above, the intake air amount is in a lean state, and when the DFCO is terminated, the intake air amount is in a rich state.

도 1은 본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법을 나타내는 순서도이다.1 is a flowchart illustrating a catalyst monitoring method of a soot filtration device according to an exemplary embodiment of the present invention.

도 1을 참조하면, 본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법은 DFCO가 실시되어(S10), 흡입 공기량이 린 상태가 되면(S12), 전방 산소센서가 감지하는 산소량을 체크하고(S14), 후방 산소센서가 감지하는 산소량을 체크한다(S16).Referring to Figure 1, the catalyst monitoring method of the soot filtration device according to an embodiment of the present invention DFCO is carried out (S10), when the intake air amount is in a lean state (S12), and checks the amount of oxygen detected by the front oxygen sensor (S14), check the amount of oxygen detected by the rear oxygen sensor (S16).

한편, 후방 산소센서는 도 2에 도시된 바와 같이, 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량이 린 상태가 되도록 하면 이에 반응하는데 전방 산소센서 대비 긴 지연시간을 가진다. 따라서, 종래의 매연 여과 장치의 촉매 모니터링 방법은 매연 여과 장치의 촉매 모니터링을 위하여 일부러 아이들시에 흡입 공기량이 린 상태가 된 후에 후방 산소센서가 흡입 공기량의 린 상태에 반응할 수 있도록 하는 시간을 확보해주어야 한다. 하지만, 도 3을 참조하면, DFCO가 실시되어 흡입 공기량이 린 상태가 되었을 때, 후방 산소센서가 반응시간 종래대비 짧아진다. 따라서, 본 발명의 매연 여과 장치의 촉매 모니터링 방법은 DFCO 실시 후에 시간을 확보할 필요가 없다.Meanwhile, as illustrated in FIG. 2, the rear oxygen sensor has a long delay time compared to the front oxygen sensor in response to the inhaled air amount being lean when idle for the catalyst monitoring of the soot filtration device. Therefore, the conventional catalyst monitoring method of the soot filtration device secures a time for the rear oxygen sensor to react to the lean state of the intake air amount after the inlet air amount is lean state at idle for catalyst monitoring of the soot filtration device. You should. However, referring to FIG. 3, when the DFCO is performed and the intake air amount is in a lean state, the rear oxygen sensor is shorter than the conventional reaction time. Therefore, the catalyst monitoring method of the soot filtration device of the present invention does not need to secure time after DFCO.

이후, DFCO가 종료되면(S18), 본 발명의 매연 여과 장치의 촉매 모니터링 방법은 전방 산소센서와 후방 산소센서가 감지하는 산소량의 차이를 이용하여 매연 여과 장치의 촉매의 산화 정도를 모니터링한다(S20). 전방 산소센서는 DFCO가 종료되어 흡입 공기량이 리치 상태가 된 것에 반응하는데 후방 산소센서 대비 긴 지연시간을 가진다. 따라서, 본 발명의 매연 여과 장치의 촉매 모니터링 방법은 DFCO가 종료되고 흡입 공기량이 리치 상태가 된 후에 전방 산소센서가 흡입 공기량의 리치 상태에 반응할 수 없을 수도 있으므로, 반응할 수 있는 시간을 확보해주어야 한다.Then, when the DFCO is terminated (S18), the catalyst monitoring method of the soot filtration device of the present invention monitors the oxidation degree of the catalyst of the soot filtration device by using the difference in the amount of oxygen detected by the front oxygen sensor and the rear oxygen sensor (S20). ). The front oxygen sensor has a longer delay time than the rear oxygen sensor in response to the DFCO being terminated and the intake air flow becomes rich. Therefore, in the catalyst monitoring method of the particulate filter of the present invention, since the front oxygen sensor may not be able to react to the rich state of the intake air amount after DFCO is terminated and the intake air amount is rich, it is necessary to secure a time for reacting. do.

이러한 시간의 확보가 어려울 때는 본 발명의 따른 매연 여과 장치의 촉매 모니터링 방법은 상기 S14 단계에서 감지한 전방 산소센서의 산소량과 상기 S16 단계에서 감지한 후방 산소센서의 산소량을 적산하여 매연 여과 장치의 촉매 모니터링을 실시한다.When it is difficult to secure such time, the catalyst monitoring method of the soot filtration device according to the present invention integrates the amount of oxygen of the front oxygen sensor detected in step S14 and the amount of oxygen of the rear oxygen sensor detected in step S16 to catalyst of the soot filtration device. Perform monitoring.

도 1은 본 발명의 실시 예에 따른 매연 여과 장치의 촉매 모니터링 방법을 나타내는 순서도,1 is a flow chart showing a catalyst monitoring method of a soot filtration device according to an embodiment of the present invention,

도 2는 아이들시에 흡입 공기량이 린 상태가 되었을 때의 전방 산소센서와 후방 산소센서의 출력 그래프,2 is an output graph of the front oxygen sensor and the rear oxygen sensor when the intake air amount is in a lean state when idle;

도 3은 DFCO 시에 흡입 공기량이 린 상태가 되었을 때의 전방 산소센서와 후방 산소센서의 출력 그래프이다.3 is an output graph of the front oxygen sensor and the rear oxygen sensor when the amount of intake air becomes lean during DFCO.

Claims (3)

DFCO가 실시되는 단계와;DFCO is performed; 흡입 공기량이 린 상태가 되는 단계와;Making the intake air amount lean; 전방 산소센서가 감지하는 산소량을 체크하는 단계와;Checking the amount of oxygen sensed by the front oxygen sensor; 후방 산소센서가 감지하는 산소량을 체크하는 단계와;Checking the amount of oxygen sensed by the rear oxygen sensor; 상기 DFCO가 종료되는 단계와;Terminating the DFCO; 상기 전방 산소센서와 상기 후방 산소센서가 감지한 산소량의 차이를 이용하여 매연 여과 장치의 촉매의 산화 정도를 모니터링하는 단계를 포함하며,Monitoring the oxidation degree of the catalyst of the soot filtration device by using the difference in the amount of oxygen detected by the front oxygen sensor and the rear oxygen sensor, 상기 DFCO가 종료되어 상기 흡입 공기량이 리치 상태가 된 것에 반응하는 상기 전방 산소센서의 반응시간을 확보하는 단계를 더 포함하는 것을 특징으로 하는 매연 여과 장치의 촉매 모니터링 방법.And securing a reaction time of the front oxygen sensor in response to the DFCO being terminated and the intake air amount being in a rich state. 삭제delete 청구항 1에 있어서,The method according to claim 1, 상기 전방 산소센서가 감지한 산소량과 상기 후방 산소센서가 감지한 산소량 을 적산하여 상기 매연 여과 장치의 촉매 모니터링을 실시하는 단계를 더 포함하는 것을 특징으로 하는 매연 여과 장치의 촉매 모니터링 방법.And monitoring the catalyst of the smoke filtration device by integrating the amount of oxygen sensed by the front oxygen sensor and the amount of oxygen detected by the rear oxygen sensor.
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