KR100579099B1 - Control method of a catalyst overheat protection - Google Patents

Control method of a catalyst overheat protection Download PDF

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KR100579099B1
KR100579099B1 KR1020040105102A KR20040105102A KR100579099B1 KR 100579099 B1 KR100579099 B1 KR 100579099B1 KR 1020040105102 A KR1020040105102 A KR 1020040105102A KR 20040105102 A KR20040105102 A KR 20040105102A KR 100579099 B1 KR100579099 B1 KR 100579099B1
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South Korea
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condition
catalyst
limit value
driving
temperature
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KR1020040105102A
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Korean (ko)
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전갑진
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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
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • 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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

본 발명은 촉매 과열 온도(COP; Catalyst Overheating Temperature) 기능의 제어방법에 관한 것이다.The present invention relates to a method of controlling a catalyst overheating temperature (COP) function.

이 같은 본 발명은, 촉매모델온도 조건과 운전조건을 모두 만족하지 못하거나 또는 어느 하나의 조건만을 만족하지 못할 경우 바로 COP의 기능을 해제함으로써, 차량을 불필요하게 감속시킬 때 연료 강화로 인한 엔진의 스톨현상을 방지할 수 있도록 하는 촉매 과열 보호 기능의 제어방법을 제공한다.In the present invention, when the catalyst model temperature conditions and operating conditions are not satisfied or only one condition is not satisfied, the function of the engine due to fuel reinforcement when the vehicle is unnecessarily decelerated by canceling the COP function immediately. Provided is a method of controlling a catalyst overheating protection function to prevent stall phenomenon.

스로틀밸브, 엔진회전수, COPThrottle Valve, Engine Speed, COP

Description

촉매 과열 보호 기능의 제어방법{Control method of a catalyst overheat protection}Control method of a catalyst overheat protection

도 1은 본 발명의 일실시예로 촉매 과열 보호 기능의 제어방법에 대한 흐름도.1 is a flowchart illustrating a method of controlling a catalyst overheating protection function according to an embodiment of the present invention.

도 2는 종래 촉매온도의 상승에 의한 엔진 스톨 현상의 그래프.Figure 2 is a graph of the engine stall phenomenon by the rise of the conventional catalyst temperature.

도 3은 종래 엔진회전수와 스로틀밸브의 개폐 위치에 대한 관계도.Figure 3 is a relationship between the opening and closing position of the conventional engine speed and the throttle valve.

도 4는 본 발명의 일실시예로 촉매 과열 보호 기능의 제어방법에 대한 흐름도.4 is a flowchart illustrating a method for controlling a catalyst overheating protection function according to an embodiment of the present invention.

도 5는 본 발명의 일실시예로 엔진회전수에 대한 한계설정값의 테이블도.5 is a table of limit setting values for the engine speed in one embodiment of the present invention.

도 6은 본 발명의 일실시예로 스로틀밸브의 개폐에 대한 한계설정값의 테이블도.6 is a table of limit setting values for opening and closing of a throttle valve according to one embodiment of the present invention.

도 7은 본 발명의 일실시예로 스로틀밸브의 한계설정값을 설정하기 위한 스파크 지연 타이밍의 테이블도.FIG. 7 is a table of spark delay timing for setting a threshold set value of a throttle valve in one embodiment of the invention. FIG.

도 8은 본 발명의 일실시예로 엔진회전수와 엔진로드의 관계도.8 is a relationship between the engine speed and the engine rod in one embodiment of the present invention.

본 발명은 촉매 과열 온도(COP; Catalyst Overheating Temperature) 기능의 제어방법에 관한 것으로, 보다 상세하게는 차량의 운전중 촉매 온도가 과다하게 상승할 경우 연료 강화로 연소 온도를 저하시켜 촉매 온도를 저하시키는 COP기능의 작동이 촉매모델온도 조건과 운전 조건을 모두 만족하지 못하거나 또는 어느 하나의 조건만을 만족하지 못할 경우 바로 해제시켜 차량을 불필요하게 감속할 때 연료 강화(Enrichment)로 인한 엔진의 스톨(Stall)현상을 방지할 수 있도록 하는 촉매 과열 보호 기능의 제어방법에 관한 것이다.The present invention relates to a method of controlling a catalyst overheating temperature (COP) function, and more particularly, when the catalyst temperature is excessively increased during operation of the vehicle, the combustion temperature is lowered by lowering the catalyst temperature to reduce the catalyst temperature. If the operation of the COP function does not satisfy both the catalyst model temperature condition and the operation condition or only one condition, the engine stall due to fuel enrichment is released when the vehicle is unnecessarily decelerated. The present invention relates to a method of controlling a catalyst overheating protection function to prevent a phenomenon.

주지된 바와같이, COP(또는 COT; Catalyst Overheating Temperature Managment)기능은 차량의 운전중 촉매 온도가 과다하게 상승할 경우 연료 강화로 연소 온도를 저하시켜 촉매 온도의 저하를 도모하는 것이다.As is well known, the COP (or Catalyst Overheating Temperature Managment) function is to reduce the catalyst temperature by lowering the combustion temperature due to fuel enrichment when the catalyst temperature excessively rises during operation of the vehicle.

현재 Mu 및 람다 엔진에 적용중인 상기의 COP기능에는 일정 운전영역에서 견적(Estimated) 촉매 온도가 과다하게 상승하거나, 스펙(spec)의 허용 온도 이상으로 상승하는 경우 기능을 포함하고 있다.The COP function currently being applied to Mu and lambda engines includes a function in which the estimated catalyst temperature rises excessively in a certain operating range or rises above the allowable temperature of the spec.

이에따라, 종래에는 COP기능이 운전영역이 해제된 이후에도 촉매 온도가 높을 경우 해제되지 않으면서 계속적으로 연료의 강화 기능이 작동하는 문제점이 있으며, 이 경우 과다한 연료량에 의해 완감속이나 급제동시 엔진에서 스톨 현상이 유발되는 문제점이 있다.Accordingly, conventionally, the COP function has a problem in that the fuel reinforcement function continues to operate even when the catalyst temperature is high even after the operation region is released. In this case, the stall phenomenon in the engine during slowing or deceleration due to excessive fuel amount is caused. There is a problem that is caused.

즉, 종래에는 도 1 내지 도 3에서와 같이, 엔진속도(RPM＞COP RPM) & 스로틀밸브 위치(TPS or Load＞Load Threshold)의 운전조건(VRPM & VTHROT Constant Enable)이 설정 한계값(Threshold)의 운전조건 이상으로 상승한 상태와, 촉매모델 온도{(CAT Model Temp＞Threshold, f(n,airflow)}가 설정 한계값의 온도 이상으로 상승할 경우 연료 강화(Fueling Enrichment)의 COP기능이 작동되도록 하였다.(COP Enable Fuel Enrichment)That is, in the related art, as shown in FIGS. 1 to 3, the operating conditions (VRPM & VTHROT Constant Enable) of the engine speed (RPM > COP RPM) & throttle valve position (TPS or Load > Load Threshold) are set to a threshold value (Threshold). To activate the COP function of fueling enrichment when the catalyst model temperature {(CAT Model Temp> Threshold, f (n, airflow)) rises above the operating limit of (COP Enable Fuel Enrichment)

그리고, 상기의 촉매모델온도가 설정 한계값 온도 이하로 낮아질 경우에는 상기 COP기능이 해제되도록 하였다.(Close Loop Fuel Control)When the catalyst model temperature is lowered below the set limit temperature, the COP function is released. (Close Loop Fuel Control)

그러나, 종래에는 운전영역이 해제되는 경우라도 촉매모델온도가 높을 경우에는 COP기능이 해제되지 못하는 등 촉매모델온도의 조건만 고려한 관계로, 아이들 영역 진입 후 COP기능이 작동되면서 과다 리치 현상의 발생 및 엔진에서 스톨현상이 유발되는 커다란 문제점이 있었다.However, in the related art, the COP function cannot be released when the catalyst model temperature is high even when the operating region is released. Therefore, the COP function is activated after entering the idle region, and an excessive rich phenomenon occurs. There was a big problem that caused the stall phenomenon in the engine.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출된 것으로서 본 발명은, 촉매모델온도 조건과 운전조건을 모두 만족하지 못하거나 또는 어느 하나의 조건만을 만족하지 못할 경우 바로 COP의 기능을 해제함으로써, 차량을 불필요하게 감속시킬 때 연료 강화로 인한 엔진의 스톨현상을 방지할 수 있도록 하는 촉매 과열 보호 기능의 제어방법을 제공하려는데 그 목적이 있다.Therefore, the present invention has been made to solve the above-mentioned conventional problems, the present invention, if not satisfying both the catalyst model temperature conditions and operating conditions, or does not satisfy any one of the conditions of the COP immediately It is an object of the present invention to provide a control method of a catalyst overheating protection function that can prevent the engine from stalling due to fuel enrichment when the vehicle is unnecessarily decelerated.

이하, 첨부된 도면에 의하여 본 발명의 바람직한 일실시예를 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

도 4는 본 발명의 일실시예로 촉매 과열 보호 기능 제어방법의 흐름도로서 그 진행단계는,4 is a flowchart of a method for controlling a catalyst overheating protection function according to an embodiment of the present invention.

엔진 회전수(RPM)에 대한 설정 한계값(Table1)과 스로틀밸브의 개폐 설정 한계값(Table2)에 대한 운전조건을 설정하는 제 1 단계;A first step of setting an operating condition for a set limit value Table1 for the engine speed RPM and an open / close set limit value Table2 for the throttle valve;

운전중인 차량의 엔진 회전수에 대한 운전조건이 엔진 회전수의 설정된 한계값 이상이거나(RPM＞COP RPM), 운전중인 차량의 스로틀밸브 개폐에 대한 운전조건이 설정 한계값 이상(TPS or Load＞Load Threshold)인가를 판단하는 제 2 단계;The operating condition for the engine speed of the vehicle in operation is above the set limit value of the engine speed (RPM> COP RPM), or the operating condition for opening and closing the throttle valve of the vehicle in operation is above the set limit value (TPS or Load> Load). A second step of determining whether or not a threshold is applied;

운전중인 차량의 촉매모델온도가 설정 한계값의 온도조건 이상인가를 판단하는 제 3 단계(CAT Model Temp＞Threshold);A third step (CAT Model Temp> Threshold) for determining whether the catalyst model temperature of the driving vehicle is equal to or higher than the temperature condition of the set limit value;

상기 제 2,3 단계의 판단결과 운전중인 차량의 운전조건과 촉매모델온도의 조건이 설정 한계값의 운전조건과 온도조건 이상인 경우 COP기능을 작동시키는 제 4 단계; 및,A fourth step of operating the COP function when the conditions of the driving and the catalyst model temperature of the vehicle being driven are greater than the driving condition and the temperature condition of the set threshold as a result of the determination of the second and third steps; And,

상기 제 2 단계와 제 3 단계로부터 운전중인 차량의 운전조건이 설정 한계값의 운전조건과 운전중인 차량의 촉매모델온도 조건이 설정 한계값의 온도조건을 모두 만족하지 못하거나, 어느 하나를 만족하지 못할 경우 COP기능의 작동을 해제시키는 제 5 단계; 로 진행함을 특징으로 한다.From the second and third stages, the driving condition of the driving vehicle does not satisfy both of the driving condition of the set limit value and the catalyst model temperature condition of the driving vehicle, or does not satisfy any of the temperature condition of the set limit value. If not, the fifth step of activating the COP function; Characterized in proceeding to.

다른 일면에 따라, 상기 스로틀밸브 개폐의 한계 설정값은,According to another aspect, the threshold set value of opening and closing the throttle valve,

스파크 지연 타이밍(SPKRTD; spark retardation)에 의해 설정됨을 특징으로 한다.And is set by spark delay timing (SPKRTD).

즉, 본 발명의 일실시예는 도 5에서와 같이 엔진 회전수(RPM)에 대한 설정 한계값(Table1)과, 도 6,7에서와 같이 스파크 지연 타이밍(SPKRTD-Table3)에 의해 설정되는 스로틀밸브의 개폐 설정 한계값(Table2)에 대한 운전조건을 반복적인 학 습을 통해 설정한다.That is, one embodiment of the present invention is a throttle set by the setting limit value Table1 for the engine speed RPM as shown in FIG. 5 and the spark delay timing SPKRTD-Table3 as shown in FIGS. 6 and 7. Set the operating conditions for the valve open / close set limit value (Table 2) through repetitive learning.

이후, 도 4에서와 같이 운전중인 차량의 엔진 회전수에 대한 운전조건이 엔진 회전수의 설정된 한계값 이상인가(RPM＞COP RPM), 또는 운전중인 차량의 스로틀밸브 개폐에 대한 운전조건이 설정 한계값 이상(TPS or Load＞Load Threshold)인가를 판단하는 한편, 운전중인 차량의 촉매모델온도가 설정 한계값의 온도조건 이상인가를 판단한다.(CAT Model Temp＞Threshold)Then, as shown in FIG. 4, is the driving condition for the engine speed of the vehicle in operation being greater than or equal to the set limit value of the engine speed (RPM> COP RPM), or the driving condition for opening / closing the throttle valve of the driving vehicle is the setting limit. It is determined whether the value is greater than the value (TPS or Load> Load Threshold), and it is determined whether the catalyst model temperature of the driving vehicle is higher than the temperature condition of the set limit value (CAT Model Temp> Threshold).

이때, 상기의 판단결과 운전중인 차량의 운전조건과 촉매모델온도의 조건이 설정 한계값의 운전조건과 온도조건 이상이라고 판단되는 경우, 엔진 ECU에서는 COP기능을 작동시키게 된다.At this time, when it is determined that the driving condition and the catalyst model temperature of the vehicle being driven are greater than the driving condition and the temperature condition of the set limit value, the engine ECU operates the COP function.

반면, 상기의 판단결과 운전중인 차량의 운전조건이 설정 한계값의 운전조건과 운전중인 차량의 촉매모델온도 조건이 설정 한계값의 온도조건을 모두 만족하지 못하거나, 또는 어느 하나를 만족하지 못할 경우, 상기 엔진 ECU에서는 도 8에서와 같이 COP기능의 작동을 해제시키게 되고, 이에따라 차량의 감속직 후 배기 가스온도가 저하되는 경우라도 촉매온도가 관성에 의해 상승되나 스페이스 속도(space velocity)가 낮은 영역에서 촉매가 손상되는 것을 방지할 수 있게 되는 것이다.On the other hand, if the driving condition of the vehicle in operation is that the driving condition of the set limit value and the catalyst model temperature condition of the driving vehicle do not satisfy both the temperature condition of the set limit value, or does not satisfy any one In the engine ECU, as shown in FIG. 8, the operation of the COP function is canceled. Accordingly, even when the exhaust gas temperature decreases after the deceleration of the vehicle, the catalyst temperature is increased by inertia, but the space velocity is low. It is possible to prevent the catalyst from being damaged.

이상에서 설명한 바와같이 본 발명은 촉매모델온도 조건과 운전조건을 모두 만족하지 못하거나 또는 어느 하나의 조건만을 만족하지 못할 경우 바로 COP의 기능을 해제함으로써, 차량을 불필요하게 감속시킬 때 연료 강화로 인한 엔진의 스톨현상을 방지하는 효과를 제공한다.As described above, according to the present invention, when the catalyst model temperature condition and the operation condition are not satisfied or only one condition is not satisfied, the COP function is immediately canceled, thereby unnecessarily slowing down the vehicle. It provides the effect of preventing engine stall.

Claims (2)

엔진 회전수에 대한 설정 한계값과 스로틀밸브의 개폐 설정 한계값에 대한 운전조건을 설정하는 제 1 단계;A first step of setting an operating condition for a set limit value for the engine speed and an open / close set limit value for the throttle valve; 운전중인 차량의 엔진 회전수에 대한 운전조건이 엔진 회전수의 설정된 한계값 이상이거나, 운전중인 차량의 스로틀밸브 개폐에 대한 운전조건이 설정 한계값 이상인가를 판단하는 제 2 단계;A second step of determining whether the driving condition for the engine speed of the driving vehicle is greater than or equal to the set limit value of the engine speed, or if the driving condition for opening and closing the throttle valve of the driving vehicle is greater than or equal to the setting limit value; 운전중인 차량의 촉매모델온도가 설정 한계값의 온도조건 이상인가를 판단하는 제 3 단계;A third step of determining whether the catalyst model temperature of the driving vehicle is equal to or higher than the temperature condition of the set limit value; 상기 제 2,3 단계의 판단결과 운전중인 차량의 운전조건과 촉매모델온도의 조건이 설정 한계값의 운전조건과 온도조건 이상인 경우 COP기능을 작동시키는 제 4 단계; 및,A fourth step of operating the COP function when the conditions of the driving and the catalyst model temperature of the vehicle being driven are greater than the driving condition and the temperature condition of the set threshold as a result of the determination of the second and third steps; And, 상기 제 2 단계와 제 3 단계로부터 운전중인 차량의 운전조건이 설정 한계값의 운전조건과 운전중인 차량의 촉매모델온도 조건이 설정 한계값의 온도조건을 모두 만족하지 못하거나, 어느 하나를 만족하지 못할 경우 COP기능의 작동을 해제시키는 제 5 단계; 로 진행함을 특징으로 하는 촉매 과열 보호 기능의 제어방법.From the second and third stages, the driving condition of the driving vehicle does not satisfy both of the driving condition of the set limit value and the catalyst model temperature condition of the driving vehicle, or does not satisfy any of the temperature condition of the set limit value. If not, the fifth step of activating the COP function; Method of controlling the catalyst overheating protection, characterized in that proceeding to. 제 1 항에 있어서, 상기 스로틀밸브 개폐의 한계 설정값은,The limit setting value of the throttle valve opening and closing according to claim 1, 스파크 지연 타이밍에 의해 설정됨을 특징으로 하는 촉매 과열 보호 기능의 제어방법.A method of controlling a catalyst overheating protection function, characterized in that it is set by the spark delay timing.
KR1020040105102A 2004-12-13 2004-12-13 Control method of a catalyst overheat protection KR100579099B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101338728B1 (en) * 2007-09-06 2013-12-06 현대자동차주식회사 Exhaust Gas Temperature Control Method for a Vehicle Engine
KR20230068794A (en) * 2021-11-11 2023-05-18 주식회사 현대케피코 Control method for vehicle with cvvd engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101338728B1 (en) * 2007-09-06 2013-12-06 현대자동차주식회사 Exhaust Gas Temperature Control Method for a Vehicle Engine
KR20230068794A (en) * 2021-11-11 2023-05-18 주식회사 현대케피코 Control method for vehicle with cvvd engine
KR102580383B1 (en) 2021-11-11 2023-09-19 주식회사 현대케피코 Control method for vehicle with cvvd engine

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