KR19980055793A - How to switch to Close Loop mode - Google Patents

How to switch to Close Loop mode Download PDF

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Publication number
KR19980055793A
KR19980055793A KR1019960075029A KR19960075029A KR19980055793A KR 19980055793 A KR19980055793 A KR 19980055793A KR 1019960075029 A KR1019960075029 A KR 1019960075029A KR 19960075029 A KR19960075029 A KR 19960075029A KR 19980055793 A KR19980055793 A KR 19980055793A
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South Korea
Prior art keywords
temperature
exhaust temperature
set value
oxygen sensor
activation
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KR1019960075029A
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Korean (ko)
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KR100219208B1 (en
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이태표
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박병재
현대자동차 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0223—Cooling water temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D2041/0067—Determining the EGR temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

본 발명은 시동 직후 일정 모니터링 조건에서 배기온이 기설정된 온도보다 높을 때 이때부터 일정 시간이 경과된 직후 산소 센서의 활성화를 판정되도록 하므로서 조기에 폐루프 제어 모드로 전환될 수 있도록 하여 보다 에미션을 저감시킬 수 있도록 하는 폐루프(Close Loop) 모드로의 전환 방법에 대한 것으로서, 상기한 목적을 달성시키기 위하여 본 발명은 냉각수온과 부하와 엔진 회전수가 설정치 이상으로 되는 모니터링 조건을 만족하는지를 체크하는 단계와(S1); 상기의 단계에서 모니터링 조건이 만족되면 EGR 온도 센서로부터 배기온을 체크하는 단계와(S2); 체크된 배기온을 설정치과 비교판단하게 되는 단계와(S3); 체크된 배기온이 설정치보다 크다고 판단되면 일정 시간이 경과되는지를 판단하는 단계와(S4); 일정 시간이 경과되면 산소 센서의 활성화를 판단하여 피드백 제어되도록 하는 단계(S5)로서 수행되도록 하는 것이 특징이다.According to the present invention, when the exhaust temperature is higher than the preset temperature in a constant monitoring condition immediately after starting, the activation of the oxygen sensor is determined immediately after a predetermined time elapses from this time, so that it can be switched to the closed loop control mode at an early stage. The present invention relates to a method of switching to a closed loop mode in which a reduction can be performed. In order to achieve the above object, the present invention provides a method for checking a cooling condition that satisfies a monitoring condition at which a cooling water temperature, a load, and an engine speed are greater than or equal to a set value. (S1); Checking exhaust temperature from the EGR temperature sensor when the monitoring condition is satisfied in the above step (S2); Comparing the checked exhaust temperature with a set value (S3); Determining whether a predetermined time elapses when it is determined that the checked exhaust temperature is greater than a set value (S4); After a certain time elapses, it is characterized in that it is performed as a step (S5) to determine the activation of the oxygen sensor to be controlled feedback.

Description

폐루프(Close Loop) 모드로의 전환 방법How to switch to Close Loop mode

본 발명은 배기가스의 온도에 의해 산소 센서의 활성화 시점을 단축시키도록 하는 폐루프(Close Loop) 모드로의 전환방법에 대한 것이다.The present invention relates to a method of switching to the closed loop mode to shorten the activation time of the oxygen sensor by the temperature of the exhaust gas.

폐루프 모드란 차량에 시동이 걸려져 있는 상태에서 산소 센서가 최소 동작 온도를 넘게 되면서 산소 센서로부터의 출력 신호에 의해 공연비가 진하거나 희박하게 피드백 제어되도록 하는 연료 제어 모드이다.The closed loop mode is a fuel control mode in which the oxygen sensor is over or above the minimum operating temperature while the vehicle is started, and the air-fuel ratio is fed by the output signal from the oxygen sensor to have a dark or lean feedback control.

즉 일반적으로 엔진이 시동되어 웜업(Warm Up)이 되면 연료 제어 시스템은 정밀한 배기제어와 연료 절감을 위하여 개방 루프(Open Loop) 제어 모드로 전환하게 된다. 이같은 상기 개방 루프 제어 모드에서는 흡입 공기의 체적 유동률 및 공기의 속도와 밀도에 의해 적절한 공연비가 유지되도록 한다.That is, in general, when the engine is started and warmed up, the fuel control system switches to the open loop control mode for precise exhaust control and fuel saving. In this open loop control mode, the proper air-fuel ratio is maintained by the volume flow rate of the intake air and the speed and density of the air.

이러한 개방 루프 제어모드는 산소 센서가 정확한 측정을 할 수 있을 때까지 유지되다 냉각수온과 부하와 엔진 회전수가 전자 제어 장치(ELECTRONIC CONTROL UNIT, 이하 ECU로 약칭함)에 기입력된 설정치 이상으로 판단된 직후 일정 시간(약 3∼4분)을 경과하게 되면 산소 센서의 활성화를 판단하면서 폐루프 제어 모드로 전환되도록 한 후 공연비의 피드백 제어가 수행되도록 한다.This open loop control mode is maintained until the oxygen sensor is able to make accurate measurements. The coolant temperature, load and engine speed are determined to be above the preset values entered in the electronic control unit. Immediately after a certain time (about 3 to 4 minutes) has elapsed, it is switched to the closed loop control mode while determining the activation of the oxygen sensor, and then the feedback control of the air-fuel ratio is performed.

그러나 상기와 같은 냉각수온에 따른 산소 센서의 활성화판단은 실질적으로 산소 센서가 배기열에 의해 활성화되는 시점과 촉매의 활성화 시간(약 40초 정도)에 비해 너무 지체되므로서 배출가스 측면에서는 에미션(Emission)에 대단히 악화되는 문제점이 있다.However, the activation judgment of the oxygen sensor according to the cooling water temperature is substantially delayed compared to the time when the oxygen sensor is activated by the exhaust heat and the activation time of the catalyst (about 40 seconds). ) Is a problem that is greatly worsened.

본 발명은 상기한 문제점을 보완시키기 위한 것으로서, 이를 위해 본 발명은 시동 직후 일정 모니터링 조건에서 배기온이 기설정된 온도보다 높을 때 이때부터 일정 시간이 경과된 직후 산소 센서의 활성화를 판정되도록 하므로서 조기에 폐루프 제어 모드로 전환될 수 있도록 하여 보다 에미션을 저감시킬 수 있도록 하는 폐루프(Close Loop) 모드로의 전환 방법을 제공코자 하는데 목적이 있다.The present invention is to solve the above problems, to this end the present invention is to determine the activation of the oxygen sensor immediately after a certain time elapsed from this time when the exhaust temperature is higher than the predetermined temperature in a constant monitoring condition immediately after starting It is an object of the present invention to provide a method of switching to a closed loop mode that can be reduced to more emission by allowing a switch to a closed loop control mode.

상기한 목적을 달성시키기 위하여 본 발명은 냉각수온과 부하와 엔진 회전수가 설정치 이상으로 되는 모니터링 조건을 만족하는지를 체크하는 단계와; 상기의 단계에서 모니터링 조건이 만족되면 EGR 온도 센서로부터 배기온을 체크하는 단계와; 체크된 배기온을 설정치과 비교판단하게 되는 단계와; 체크된 배기온이 설정치보다 크다고 판단되면 일정 시간이 경과되는지를 판단하는 단계와; 일정 시간이 경과되면 산소 센서의 활성화를 판단하여 피드백 제어되도록 하는 단계로서 수행하게 됨을 특징으로 한다.In order to achieve the above object, the present invention includes the steps of checking whether the cooling water temperature, the load and the engine speed satisfies a monitoring condition that is above the set value; Checking exhaust temperature from the EGR temperature sensor when the monitoring condition is satisfied in the above step; Comparing the checked exhaust temperature with a set value; Determining whether a predetermined time elapses when it is determined that the checked exhaust temperature is greater than a set value; After a predetermined time elapses, it is performed as a step of determining the activation of the oxygen sensor so as to control feedback.

도 1은 본 발명에 따른 개략적인 제어 구조도1 is a schematic control structure diagram according to the present invention

도 2는 본 발명에 따른 제어 순서도2 is a control flowchart according to the present invention

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 엔진2 : EGR 온도 센서1: engine 2: EGR temperature sensor

3 : 전자 제어 장치(Eletronic Control Unit)3: Electronic Control Unit

4 : 산소 센서4: oxygen sensor

이를 첨부한 실시예 도면을 참조하여 보다 상세하게 설명하면 도 1은 본 발명에 따른 요부 구조를 도시한 것으로서, 도면부호 1은 엔진이며, 2는 EGR 온도 센서이다.Referring to this in more detail with reference to the accompanying drawings, Figure 1 shows a main structure according to the present invention, 1 is an engine, 2 is an EGR temperature sensor.

상기 EGR 온도 센서(2)에서는 배기가스의 재순환 온도를 체크하여 ECU(3)에 전달하게 되면 상기 ECU(3)에서는 냉각수온과 부하와 엔진 회전수를 동시에 체크하여 모드 전환을 제어하게 된다.When the EGR temperature sensor 2 checks the recirculation temperature of the exhaust gas and transmits it to the ECU 3, the ECU 3 controls the mode switching by simultaneously checking the coolant temperature, the load, and the engine speed.

도면 부호 5는 배기가스의 일부를 흡기계로 재순환되도록 하는 EGR밸브이다.Reference numeral 5 denotes an EGR valve for recycling a part of the exhaust gas to the intake system.

도 2에서 보는 바와 같이 냉각수온과 부하와 엔진 회전수가 ECU(3)에 기입력된 설정값 이상이 되는지를 비교판단하여(S1) 상기 모니터링 조건을 만족하면 EGR 온도 센서(2)로부터 배기온을 체크한다(S2).As shown in FIG. 2, the cooling water temperature and the load and the engine speed are compared to determine whether or not the set value input to the ECU 3 or more (S1). When the monitoring condition is satisfied, the exhaust temperature from the EGR temperature sensor 2 is determined. Check (S2).

이때의 배기온이 ECU(3)에 기입력된 설정값 이상으로 판단되면(S3) 그때부터 일정 시간을 기다려(S4) 일정 시간을 경과한 직후부터 산소 센서(4)로부터의 신호를 체크하여 폐루프 제어 모드로 전환되도록 하므로서 피드백 공연비 제어가 이루어질 수 있도록 하는 것이다(S5).If the exhaust temperature at this time is determined to be equal to or larger than the preset value input to the ECU 3 (S3), the controller waits for a predetermined time from there (S4) and checks the signal from the oxygen sensor 4 immediately after the predetermined time passes and closes. The feedback air-fuel ratio control is made by switching to the loop control mode (S5).

이같은 제어는 촉매가 활성화되는 시간은 대단히 짧은데 비해 종전에는 산소 센서의 활성화 판단이 대단히 늦게 이루어지므로서 공연비의 피드백 제어의 지연에 따라 시동 초기의 에미션을 악화시키게 되는데 반해 본 발명에서는 EGR 온도 센서(2)에 의해 산소 센서(4)의 활성화 판단 시점이 실질적으로 산소 센서가 활성화되는 시점에 근접해서 수행될 수 있도록 하므로서 피드백 공연비 제어를 조기에 수행될 수 있도록 하는 것이다.Such control is very short time for the catalyst to be activated, but in the past, the determination of the activation of the oxygen sensor is made very late, and according to the delay of the feedback control of the air-fuel ratio, the emission of the initial start-up is deteriorated. By 2) it is possible to perform the feedback air-fuel ratio control early, so that the activation determination time of the oxygen sensor 4 can be performed substantially close to the time when the oxygen sensor is activated.

따라서 본 발명은 냉각수온이 일정값 이상으로 되면서 배기온이 기입력된 설정값에 도달하게 되면 일정 시간을 경과후 바로 산소 센서의 활성화를 판정하면서 조기에 폐루프 제어모드로의 모드 전환이 이루어질 수 있도록 하는 것이다.Therefore, in the present invention, when the cooling water temperature reaches a predetermined value and the exhaust temperature reaches a predetermined value, the mode switch to the closed loop control mode can be performed early while determining the activation of the oxygen sensor immediately after a predetermined time. To ensure that

이같은 모드 전환은 특히 배기온에 의해 산소 센서가 활성화되는 시점에서 바로 활성화 판정이 이루어질 수 있도록 하여 보다 엔진 구동의 정상화를 촉진시키게 되는 동시에 에미션을 대폭적으로 저감시킬 수 있도록 한다.Such a mode change enables activation determination to be made immediately at the time when the oxygen sensor is activated by the exhaust temperature, thereby facilitating the normalization of engine driving, and greatly reducing the emission.

그러므로 본 발명에 따른 제어에 의해 배기온에 의해 산소 센서(4)가 활성화 되는 시점에 활성화 판정이 이루어지면서 폐루프 제어모드로의 전환을 조기에 수행되도록 하면서 촉매에 의한 시동 초기의 에미션 저감을 촉진되도록 하는 매우 유용한 효과가 있게 되는 것이다.Therefore, the activation determination is made at the time when the oxygen sensor 4 is activated by the exhaust temperature by the control according to the present invention, so that the switch to the closed loop control mode can be performed early, while reducing the initial emission by the catalyst. There is a very useful effect of promoting it.

Claims (1)

냉각수온과 부하와 엔진 회전수가 설정치 이상으로 되는 모니터링 조건을 만족하는지를 체크하는 단계와(S1);Checking whether the cooling water temperature, the load and the engine rotational speed satisfy a monitoring condition that is equal to or higher than a set value (S1); 상기의 단계에서 모니터링 조건이 만족되면 EGR 온도 센서로부터 배기온을 체크하는 단계와(S2);Checking exhaust temperature from the EGR temperature sensor when the monitoring condition is satisfied in the above step (S2); 체크된 배기온을 설정치과 비교판단하게 되는 단계와(S3);Comparing the checked exhaust temperature with a set value (S3); 체크된 배기온이 설정치보다 크다고 판단되면 일정 시간이 경과되는지를 판단하는 단계와(S4);Determining whether a predetermined time elapses when it is determined that the checked exhaust temperature is greater than a set value (S4); 일정 시간이 경과되면 산소 센서의 활성화를 판단하여 피드백 제어되도록 하는 단계(S5);Determining the activation of the oxygen sensor when the predetermined time elapses such that feedback is controlled (S5); 로서 수행하게 됨을 특징으로 하는 폐루프 모드로의 전환 방법.A method of switching to a closed loop mode, characterized in that performed as.
KR1019960075029A 1996-12-28 1996-12-28 Method for converting into close loop mode KR100219208B1 (en)

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KR1019960075029A KR100219208B1 (en) 1996-12-28 1996-12-28 Method for converting into close loop mode

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KR100219208B1 KR100219208B1 (en) 1999-09-01

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