KR20090118735A - Monitoring system for diesel vehicle and method thereof - Google Patents

Monitoring system for diesel vehicle and method thereof Download PDF

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KR20090118735A
KR20090118735A KR1020080044702A KR20080044702A KR20090118735A KR 20090118735 A KR20090118735 A KR 20090118735A KR 1020080044702 A KR1020080044702 A KR 1020080044702A KR 20080044702 A KR20080044702 A KR 20080044702A KR 20090118735 A KR20090118735 A KR 20090118735A
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control
air volume
volume control
air
lnt catalyst
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KR1020080044702A
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Korean (ko)
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KR101416345B1 (en
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박진우
조준규
박일수
유성일
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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
    • 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
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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)
  • Exhaust Gas After Treatment (AREA)

Abstract

PURPOSE: A monitoring apparatus and method of a diesel vehicle are provided to increase fuel efficiency and LNT catalyst regeneration efficiency by monitoring an air volume control unit. CONSTITUTION: A monitoring method of a diesel vehicle determines that the NOx purifying efficiency of a LNT(lean NOx trap) catalyst is in a DeNOx operating condition(S102). If yes, the air volume control is practiced after air volume and control factor of a first goal standard value are determined(S104). If the air volume control is unable to be performed with a first goal standard value within a first base time, the control factor delaying the air volume control is determined(S107). The air volume control is practiced after an air volume control target value of the control factor delaying the air volume control is reestablished(S109). If the air volume control is unable to be performed with a reset target value within a second base time, DeNOx operation of the LNT catalyst is stopped and the failure of the corresponding control factor is determined(S112).

Description

디젤 차량의 모니터링 장치 및 방법{MONITORING SYSTEM FOR DIESEL VEHICLE AND METHOD THEREOF}MONITORING SYSTEM FOR DIESEL VEHICLE AND METHOD THEREOF

본 발명은 디젤 차량의 모니터링 장치 및 방법에 관한 것으로, 더 상세하게는 LNT촉매의 DeNOx 동작에서 공기량 제어수단의 고장 여부를 판별하는 디젤 차량의 모니터링 장치 및 방법에 관한 것이다.The present invention relates to a monitoring apparatus and method for a diesel vehicle, and more particularly to a monitoring apparatus and method for a diesel vehicle for determining whether the air volume control means in the DeNOx operation of the LNT catalyst.

디젤 차량에는 북미디젤 Tier2 BIN5 규제나 유로 6 배기가스 규제 중에서 NOx 및 PM의 규제를 만족시키기 위하여 별도의 후처리계 시스템이 적용되고 있는데, 현재 디젤 차량에 적용되는 시스템은 LNT(Lean NOx Trap)촉매와 DPF(Diesel Particulate Filter) 등과 같은 DeNOx 촉매가 적용된다.For diesel vehicles, a separate aftertreatment system is applied to satisfy the NOx and PM regulations among North American diesel Tier 2 BIN5 regulations or Euro 6 emission regulations. Currently, the diesel vehicle system is a LNT (Lean NOx Trap) catalyst. And DeNOx catalysts such as Diesel Particulate Filter (DPF).

상기 LNT촉매는 NOx 흡장촉매와 DOC(Diesel Oxidation Catalyst)가 하나의 담체에 구성되어 후처리계에서 엔진과 근접한 최상류측에 설치되고, LNT촉매의 하류측에 입자상 물질(PM)을 포집하는 DPF가 설치된다.The LNT catalyst is composed of a NOx storage catalyst and a DOC (Diesel Oxidation Catalyst) in one carrier and installed on the uppermost side of the post-treatment system close to the engine, and the DPF collecting particulate matter (PM) downstream of the LNT catalyst. Is installed.

상기 LNT촉매는 희박(Lean) 운전영역에서 백금(Pt)과 같은 산화촉매, 산화바륨 등의 촉매 담층(Wash coat)에 NOx를 흡착하여 로딩(Loading)하고, 농후(Rich) 운전영역에서 로딩된 NOx를 환원시켜 LNT촉매를 재생한다. The LNT catalyst is loaded by adsorbing NOx to an oxide catalyst such as platinum (Pt) and a catalyst coat such as barium oxide in a lean driving region, and loaded in a rich operating region. NOx is reduced to regenerate the LNT catalyst.

상기 LNT촉매에 NOx의 로딩량 증가하여 LNT촉매의 정화효율이 떨어지면 엔진을 희박 운전영역에서 농후 운전영역으로 제어하여 LNT촉매를 DeNOx 한다.When the loading amount of NOx increases in the LNT catalyst and the purification efficiency of the LNT catalyst decreases, the engine is controlled from the lean operation region to the rich operation region to deNOx the LNT catalyst.

이와 같이 희박 운전영역에서 농후 운전영역으로 제어하기 위해서는 먼저 공기량 조절 밸브, EGR 등을 제어하는 공기량 제어를 실행하고, 공기량 제어가 완료되었거나 공기량 제어에 따른 설정된 시간이 경과하면 연료량 제어를 실행한다.As described above, in order to control the lean driving region to the rich operating region, first, the air volume control for controlling the air volume control valve, the EGR, and the like is executed.

상기한 제어방법은 목표 수준까지의 공기량 제어가 이루어지지 못하였으나 설정된 시간의 경과로 인하여 연료량 제어 단계로 진입함으로써, LNT촉매의 DeNOx를 위한 농후 운전영역이 충분하게 확보되지 못하여 LNT촉매의 재생이 원활하게 이루어지지 못하는 문제점이 발생한다.In the above control method, the air volume control to the target level was not achieved, but the fuel volume control step was entered due to the elapse of the set time, so that the rich operating area for the DeNOx of the LNT catalyst was not sufficiently secured, so that the LNT catalyst was regenerated smoothly. There is a problem that can not be made.

또한, LNT촉매의 재생이 정상적으로 이루어지지 못하여 배출가스의 악화와 연비 악화를 초래하는 문제점이 발생한다. In addition, there is a problem that the regeneration of the LNT catalyst is not made normally, leading to deterioration of the exhaust gas and fuel economy deterioration.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 LNT촉매의 DeNOx 동작에서 공기량 제어수단의 고장 여부를 모니터링 하는 배출가스 규제에 대응되도록 하는 것이다.The present invention has been invented to solve the above problems, and its object is to correspond to the exhaust gas regulation for monitoring the failure of the air volume control means in the DeNOx operation of the LNT catalyst.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 디젤 차량의 모니터링 방법은, LNT촉매의 NOx 정화효율이 DeNOx 작동조건인지 판단하는 제1과정; LNT촉매의 DeNox 작동 조건이면 제1목표 기준치의 공기량과 제어인자를 결정하여 공기량 제어를 실행하는 제2과정; 제1기준시간 이내에 제1목표 기준치로 공기량 제어가 실행되지 못하면 공기량 제어를 지연시키는 제어인자를 판단하는 제3과정; 상기 공기량 제어를 지연시키는 제어인자의 공기량 제어 목표치를 재설정한 다음 공기량 제어를 실행하는 제4과정; 제2기준시간 이내에 재설정된 목표치로 공기량 제어가 실행되지 못하면 해당 제어인자의 고장을 판별하고 LNT촉매의 DeNOx 동작을 중지하는 제5과정을 포함한다.According to an aspect of the present invention, there is provided a method for monitoring a diesel vehicle, the method comprising: determining whether an NOx purification efficiency of an LNT catalyst is a DeNOx operating condition; A second step of performing air amount control by determining an air amount and a control factor of the first target reference value when the DeNox operating condition of the LNT catalyst is performed; A third step of determining a control factor that delays the air amount control if the air amount control is not performed to the first target reference value within the first reference time; A fourth step of resetting the air quantity control target value of the control factor which delays the air quantity control and then executing the air quantity control; If the air volume control is not performed to the target value reset within the second reference time, a fifth step of determining the failure of the control factor and stopping the DeNOx operation of the LNT catalyst.

전술한 구성에 의하여 본 발명은 디젤 차량에서 LNT촉매의 DeNOx 동작에서 공기량 제어수단을 모니터링 함으로써, 배출가스 규제에 능동적으로 대응하며, LNT촉매의 재생 효율과 연비 향상을 제공하는 효과가 기대된다. By the above-described configuration, the present invention is expected to have an effect of actively responding to the regulation of the emission gas by monitoring the air amount control means in the DeNOx operation of the LNT catalyst in a diesel vehicle, and providing an improved regeneration efficiency and fuel efficiency of the LNT catalyst.

아래에서는 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 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 디젤 차량의 흡배기 시스템 구성을 도시한 도면이다.1 is a view showing a configuration of an intake and exhaust system of a diesel vehicle according to an embodiment of the present invention.

본 발명은 엔진(10)과, 엔진(10)에 흡입되는 공기량을 검출하는 공기량 검출 센서(20), 엔진(10)에서 연소된 배기가스의 에너지로 엔진(10)에 흡입되는 공기를 과급시키는 터보차저(30)가 장착된다.The present invention supercharges the air sucked into the engine 10 with the energy of the exhaust gas combusted by the engine 10, the air amount detection sensor 20 for detecting the amount of air sucked into the engine 10, and the engine 10. The turbocharger 30 is mounted.

상기 터보차저(30)는 배기 매니폴더의 소정 위치에 임펠라(31)가 장착되고, 흡기 매니폴더의 소정 위치에 터빈(32)이 장착되어 임펠라(31)의 동작에 따라 터빈(32)이 동작되어 흡입공기를 과급시킨다.The turbocharger 30 has an impeller 31 mounted at a predetermined position of the exhaust manifold, and a turbine 32 mounted at a predetermined position of the intake manifold, so that the turbine 32 operates according to the operation of the impeller 31. To supercharge the intake air.

상기 임펠라(31)의 하류측에 NOx 흡장촉매(55)와 DOC(57)가 하나의 담체에 구성되는 LNT촉매(50)가 설치되고, LNT촉매(50)의 하류측에 DPF(60)가 설치된다.On the downstream side of the impeller 31, an NOx storage catalyst 55 and a DOC 57 are provided with an LNT catalyst 50 composed of one carrier, and a DPF 60 is provided downstream of the LNT catalyst 50. Is installed.

상기 LNT촉매(50)는 엔진(10)의 희박 운전영역에서 백금(Pt)과 같은 산화촉매, 산화바륨 등의 촉매 담층에 NOx를 흡착하여 로딩하고, 농후 운전영역에서 촉매에 흡장된 NOx를 환원시켜 재생된다. The LNT catalyst 50 adsorbs and loads NOx into an oxide catalyst such as platinum (Pt) and a catalyst bilayer such as barium oxide in a lean operation region of the engine 10, and reduces NOx stored in the catalyst in the rich operation region. Play it.

상기 LNT촉매(50)의 상류측에 제1NOx센서(51)가 설치되고, 하류측에 제2NOx센서(52)가 설치되어 제어부(100)에 연결되며, 제2NOx센서(52)의 하류측에 온도센서(53)가 설치되어 제어부(100)에 연결된다.The first NOx sensor 51 is installed on the upstream side of the LNT catalyst 50, and the second NOx sensor 52 is installed on the downstream side and connected to the control unit 100, and downstream of the second NOx sensor 52. The temperature sensor 53 is installed and connected to the control unit 100.

상기 DPF(60)는 배출가스에 포함된 입자상 물질(PM)을 포집하고, DPF(60)의 상류 및 하류측에는 설치된 도시되지 않은 차압센서는 입자상 물질(PM)의 흡장량에 대한 정보를 제어부(100)에 제공한다.The DPF 60 collects particulate matter (PM) included in the exhaust gas, and the differential pressure sensor (not shown) installed upstream and downstream of the DPF 60 controls information about the storage amount of the particulate matter PM. 100).

제어부(100)는 상기 LNT촉매(50)의 양단에 설치되는 제1,2NOx센서(51)(52)의 신호를 분석하여 LNT촉매(50)의 NOx 정화효율을 판단하여 NOx의 로딩량과 DeNOx 시점을 판단한다.The controller 100 analyzes the signals of the first and second NOx sensors 51 and 52 installed at both ends of the LNT catalyst 50 to determine the NOx purification efficiency of the LNT catalyst 50 to determine the loading amount of the NOx and the DeNOx. Determine the time point.

상기 제어부(100)는 LNT촉매(50)의 재생이 필요한 상태이면 엔진(10)을 희박 운전영역으로 제어하여 LNT촉매(50)의 DeNOx 동작을 실행하며, 희박 운전영역의 진입을 제어하는 과정에서 제1목표 기준치의 공기량과 제어인자를 결정하여 공기량 제어를 실행한다.If the regeneration of the LNT catalyst 50 is necessary, the controller 100 controls the engine 10 to the lean driving region to perform DeNOx operation of the LNT catalyst 50, and in the process of controlling the entry of the lean driving region. Air volume control is performed by determining the air volume and the control factor of the first target reference value.

상기 결정되는 공기량 제어인자는 공기량 조절 밸브(Air Control Valve), EGR, 터보 차저(30) 중 어느 하나 이상이 포함된다.The determined air amount control factor includes at least one of an air control valve, an EGR, and a turbocharger 30.

그리고, 공기량 제어가 완료되지 않은 상태에서 설정된 제1기준시간이 초과하면 공기량 제어를 지연시키는 공기량 제어수단을 판단하고, 판단된 공기량 제어수단의 제어값을 재설정하여 공기량 제어를 실행한다.Then, when the first reference time set in a state where the air volume control is not completed is exceeded, the air volume control means for delaying the air volume control is determined, and the control value of the determined air volume control means is reset to execute air volume control.

재설정된 제어값으로 공기량 제어가 완료되면 연료량 제어단계로 진입하고, 설정된 제2기준시간 이내에 공기량 제어가 완료되지 못하면 상기 판단된 공기량 제어수단을 고장으로 판정하고, LNT촉매(50)의 DeNOx 동작을 종료한다.When the air amount control is completed with the reset control value, the fuel level control step is entered. If the air amount control is not completed within the set second reference time, the determined air amount control means is determined to be a failure, and the DeNOx operation of the LNT catalyst 50 is performed. Quit.

전술한 기능을 포함하여 구성되는 본 발명에 따른 디젤 차량에서 LNT의 DeNOx 동작에서 공기량 제어수단을 모니터링 하는 동작에 대하여 도 2를 참조하여 상세하게 설명한다.An operation of monitoring the air amount controlling means in the DeNOx operation of the LNT in the diesel vehicle including the above-described function will be described in detail with reference to FIG. 2.

디젤 차량의 운행이 개시되면 제어부(100)는 차량의 각각 위치에 장착되는 센서들로부터 현재의 차속, RPM(엔진 회전수), 부하 등을 포함하는 엔진의 운전조건을 검출한다.When the driving of the diesel vehicle is started, the control unit 100 detects the driving conditions of the engine including the current vehicle speed, RPM (engine revolution speed), load, and the like from sensors mounted at respective positions of the vehicle.

그리고, 온도센서(53)의 신호를 분석하여 LNT촉매(50)의 활성화 여부를 검출하고, 제1,2NOx센서(51)(52)의 신호를 분석하여 LNT촉매(50)의 NOx 정화효율과 NOx의 로딩량을 판단한다(S101).In addition, the signal of the temperature sensor 53 is analyzed to detect whether the LNT catalyst 50 is activated, and the signals of the first and second NOx sensors 51 and 52 are analyzed to analyze the NOx purification efficiency of the LNT catalyst 50 and the like. The loading amount of the NOx is determined (S101).

상기 LNT촉매(50)의 온도가 활성화의 상태이고, NOx의 정화효율 및 로딩량이 DeNOx 작동 조건인지를 판단한다(S102).It is determined whether the temperature of the LNT catalyst 50 is in an activated state, and the purification efficiency and loading amount of NOx are operating conditions of DeNOx (S102).

상기 S102의 판단에서 LNT촉매(50)의 DeNOx 작동 조건이 아니면 상기 S101의 과정으로 리턴되어 전술한 동작을 반복 실행하고, DeNOx 작동조건이면 엔진(10)을 농후 운전영역으로 제어하기 위한 공기량 제어값을 설정한다(S103).If the DeNOx operating condition of the LNT catalyst 50 in the determination of S102 returns to the process of S101 to repeatedly execute the above-described operation, and if the DeNOx operating condition, the air amount control value for controlling the engine 10 to the rich operation region. Is set (S103).

이때, 공기량을 조정하는 제어인자(공기량 조절수단)와 제1목표 기준치의 공기량이 결정된다.At this time, the control factor (air amount adjusting means) for adjusting the air amount and the air amount of the first target reference value are determined.

공기량 제어값이 설정되면 제어부(100)는 공기량 조절 밸브(ACV), EGR, 터보 차저(30)중 어느 하나 이상을 포함하는 제어인자(공기량 조절수단)를 동작시켜 제1목표 기준치의 공기량이 제어되도록 공기량 제어를 실행한다(S104).When the air volume control value is set, the controller 100 operates a control factor (air volume control means) including any one or more of the air volume control valve (ACV), the EGR, and the turbocharger 30 to control the air volume of the first target reference value. Air volume control is executed as much as possible (S104).

이후, 공기량 제어가 정상적으로 완료되었는지를 판단하여(S105), 정상적으로 완료되지 않은 상태이면 설정된 제1기준시간이 초과되었는지를 판단한다(S106).Thereafter, it is determined whether the air amount control is normally completed (S105). If it is not normally completed, it is determined whether the set first reference time is exceeded (S106).

상기 S106의 판단에서 제1기준시간이 초과되지 않았으면 상기 S104로 리턴되어 제1목표 기준치로 제어될 수 있도록 결정된 제어인자(공기량 조절수단)를 동작시켜 공기량 제어를 지속적으로 실행한다.If it is determined in S106 that the first reference time has not been exceeded, the control factor (air volume control means) determined to be returned to S104 and controlled to the first target reference value is operated to continuously execute air volume control.

그러나, 제1기준시간이 초과되었으면 제1목표 기준치로의 공기량 제어를 지연시키는 제어인자(공기량 조절수단)가 무엇인지를 판단한다(S107).However, if the first reference time is exceeded, it is determined what is the control factor (air amount adjusting means) for delaying the control of the air amount to the first target reference value (S107).

상기 S107에서 공기량 제어를 지연시키는 제어인자(공기량 조절수단)가 판단되면 판단된 제어인자의 공기량 제어값(제2목표 기준치)을 재설정한 다음(S108) 제어인자를 동작시켜 제2목표 기준치로의 공기량 제어를 실행한다(S109).If it is determined in step S107 that the control factor (air volume control means) for delaying the air volume control is reset, the air volume control value (second target reference value) of the determined control factor is reset (S108), and then the control factor is operated to the second target reference value. Air volume control is executed (S109).

상기 S109의 공기량 제어가 정상적으로 완료되었는지를 판단하여(S110), 정상 완료가 실행되지 않았으면 설정된 제2기준시간이 초과되었는지 판단한다(S111).It is determined whether the air volume control of S109 is normally completed (S110), and if the normal completion is not executed, it is determined whether the set second reference time is exceeded (S111).

상기 S111의 판단에서 설정된 제2기준시간이 초과되지 않았으면 상기 S109의 과정으로 리턴하여 공기량 제어를 지속적으로 유지한다.If the second reference time set in the determination of S111 is not exceeded, the process returns to the process of S109 to continuously maintain the air amount control.

상기 제2목표 기준치로 공기량을 제어하는 과정에서 제2기준시간에 도달하기까지의 흡입 공기량의 변화, 엔진 회전수의 변화, 부하의 변화 등 엔진상태 변화량을 누적하여 기준치를 초과하면 엔진상태 변화에 의한 공기량 제어의 지연으로 판단한다.In the process of controlling the air amount with the second target reference value, the engine state change amount is accumulated when the engine state change amount such as the change of the intake air amount until the second reference time is reached, the engine speed change, the load change, and the like is changed. Judging by the delay of air volume control by

그러나, 엔진상태 변화량의 누적치가 기준치 미만이면 제어인자의 이상으로 판정하고, 그 횟수가 기준 횟수 이상이며, 설정된 제2기준시간이 초과되었으면 해당 제어인자(공기량 조절수단)의 고장으로 판별한 다음 고장코드를 출력하고 LNT촉매(50)의 DeNOx를 동작을 종료한다(S112)(S113).However, if the cumulative value of the engine state change amount is less than the reference value, it is determined to be an abnormality of the control factor, and if the number of times is more than the reference number, and if the set second reference time is exceeded, it is determined as a failure of the corresponding control factor (air volume control means) and then fails. The code is output and the DeNOx of the LNT catalyst 50 is terminated (S112) (S113).

또한, 상기 S105의 판단에서 제1목표 기준치로 공기량 제어가 정상 완료되었거나 상기 S110의 판단에서 제2목표 기준치로 공기량 제어가 정상 완료되었으면 연료량 제어 단계를 실행한다.In addition, if the air amount control is normally completed as the first target reference value in the determination of S105 or the air amount control is normally completed in the second target reference value in the determination of S110, the fuel amount control step is executed.

상기한 바와 같이 본 발명은 LNT촉매의 DeNOx를 위해 농후 공연비로 제어하기 위해 공기량 제어 및 연료량을 제어함에 있어 공기량 제어를 실행하는 제어인자의 고장여부를 모니터링하여 고장 코드를 출력한다.As described above, the present invention outputs a failure code by monitoring the failure of a control factor that executes the air volume control in controlling the air volume control and the fuel volume to control the rich air-fuel ratio for the DeNOx of the LNT catalyst.

따라서, 공기량을 제어하는 제어인자의 상시 안정된 동작에 의해 배기가스의 안정화 및 연비 악화를 방지한다.Therefore, stabilization of exhaust gas and deterioration of fuel efficiency are prevented by the always stable operation of the control factor for controlling the air amount.

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 디젤 차량의 흡배기 시스템의 구성을 도시한 도면이다.1 is a view showing the configuration of an intake and exhaust system of a diesel vehicle according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 디젤 차량에서 LNT 촉매의 DeNOx 동작에서 공기량 제어수단의 진단 절차를 도시한 흐름도이다.FIG. 2 is a flowchart illustrating a diagnosis procedure of air volume control means in a DeNOx operation of an LNT catalyst in a diesel 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 : 공기량 센서10: engine 20: air volume sensor

30 : 터보차저 50 : LNT촉매30: turbocharger 50: LNT catalyst

60 : DPF 100 : 제어부60: DPF 100: control unit

Claims (5)

LNT촉매와 LNT촉매의 양단에 설치되는 NOx센서를 포함하며,It includes a NOx sensor installed at both ends of the LNT catalyst and LNT catalyst, 상기 LNT촉매의 DeNOx 작동조건이면 제1목표 기준치의 공기량과 제어인자를 결정하여 공기량 제어를 실행하고, 설정된 제1기준시간 이내에 제1목표 기준치에 도달되지 않으면 공기량 제어를 지연시키는 제어인자를 판단하며, 공기량 제어를 지연시키는 제어인자를 통한 공기량 제어값을 재설정하여 공기량 제어를 실행하고, 제2기준시간 이내에 재설정된 공기량 제어값으로 완료되지 못하면 해당 제어인자를 고장을 판정하여 고장코드를 출력하는 프로그램이 제어부에 설정되는 디젤 차량의 모니터링 장치.If the DeNOx operating condition of the LNT catalyst, the air amount and the control factor of the first target reference value is determined to execute the air volume control. To execute the air volume control by resetting the air volume control value through the control factor that delays the air volume control, and if the air volume control value is not completed within the second reference time, the control factor is determined and a fault code is output. The monitoring device of the diesel vehicle set to this control part. LNT촉매의 NOx 정화효율이 DeNOx 작동조건인지 판단하는 제1과정;Determining whether the NOx purification efficiency of the LNT catalyst is a DeNOx operating condition; LNT촉매의 DeNox 작동 조건이면 제1목표 기준치의 공기량과 제어인자를 결정하여 공기량 제어를 실행하는 제2과정;A second step of performing air amount control by determining an air amount and a control factor of the first target reference value when the DeNox operating condition of the LNT catalyst is performed; 제1기준시간 이내에 제1목표 기준치로 공기량 제어가 실행되지 못하면 공기량 제어를 지연시키는 제어인자를 판단하는 제3과정;A third step of determining a control factor that delays the air amount control if the air amount control is not performed to the first target reference value within the first reference time; 상기 공기량 제어를 지연시키는 제어인자의 공기량 제어 목표치를 재설정한 다음 공기량 제어를 실행하는 제4과정;A fourth step of resetting the air quantity control target value of the control factor which delays the air quantity control and then executing the air quantity control; 제2기준시간 이내에 재설정된 목표치로 공기량 제어가 실행되지 못하면 해당 제어인자의 고장을 판별하고 LNT촉매의 DeNOx 동작을 중지하는 제5과정;A fifth step of determining a failure of the control factor and stopping the DeNOx operation of the LNT catalyst if the air volume control is not performed at the target value reset within the second reference time; 을 포함하는 디젤 차량의 모니터링 방법.Monitoring method of a diesel vehicle comprising a. 제2항에 있어서,The method of claim 2, 상기 제2과정에서 공기량 제어인자는 EGR, ACV, 터보 차저를 포함하며, 적어도 하나 이상이 제어인자로 결정되는 디젤 차량의 모니터링 방법.The air amount control factor in the second process includes an EGR, ACV, turbocharger, at least one or more monitoring method of the diesel vehicle is determined as a control factor. 제2항에 있어서,The method of claim 2, 상기 제2과정 혹은 제4과정에서 목표 기준치로의 공기량 제어가 설정시간 이내에 정상적으로 완료되면 연료량 제어 단계로 진입하여 농후 운전영역으로 전환시키는 디젤 차량의 모니터링 방법.And monitoring the diesel vehicle to enter the fuel quantity control step when the air volume control to the target reference value is normally completed within the set time in the second process or the fourth process. 제2항에 있어서,The method of claim 2, 상기 제4과정의 실행에서 엔진상태의 변화량을 누적하여 기준치를 초과하면 엔진상태 변화에 의한 공기량 제어 지연으로 판단하고, 기준치 미만이면 제어인자의 고장에 의한 공기량 제어 지연으로 판단하며, 이상 발생 횟수가 기준 횟수를 초과하면 제어인자의 고장을 판정하는 디젤 차량의 모니터링 방법.In the execution of the fourth process, if the amount of change in the engine state is accumulated and the reference value is exceeded, it is determined that the air volume control delay is caused by the change of the engine state. A diesel vehicle monitoring method for determining a failure of a control factor when the reference number is exceeded.
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