KR20010019309A - Method for controlling an exhaust gas recirculation of diesel engine - Google Patents

Method for controlling an exhaust gas recirculation of diesel engine Download PDF

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KR20010019309A
KR20010019309A KR1019990035653A KR19990035653A KR20010019309A KR 20010019309 A KR20010019309 A KR 20010019309A KR 1019990035653 A KR1019990035653 A KR 1019990035653A KR 19990035653 A KR19990035653 A KR 19990035653A KR 20010019309 A KR20010019309 A KR 20010019309A
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egr
map
value
exhaust gas
solenoid
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KR1019990035653A
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Korean (ko)
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KR100313008B1 (en
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김광연
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류정열
기아자동차 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
    • F02D41/0025—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]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • 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
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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
    • Y02T10/12—Improving ICE efficiencies

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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)

Abstract

PURPOSE: A control method for an exhaust gas recirculation is provided to reduce nitric oxide in exhaust gas by enabling an EGR(exhaust gas recirculation system) to operate even at a lower temperature than the temperature of coolant. CONSTITUTION: An EGR control amount is calculated in an EGR control target map(10) and multiplied by a coolant temperature correcting coefficient. The coolant temperature correcting coefficient starts when coolant temperature is in about 30deg.C with the start of the EGR and slowly increases until the coolant temperature is in about 70deg.C. Then, the correcting coefficient becomes 1.0 in a maximum EGR operating temperature. The EGR control amount is output to an output mode(20) and an actual EGR control value is subtracted from the EGR control amount. The subtracted value is output to an EGR bent solenoid/EGR vacuum solenoid map(30) to obtain a diagram about the actual EGR value and the duty value of the EGR vent solenoid/EGR vacuum solenoid map. Herein, the EGR vent solenoid map controls an EGR vent solenoid valve in case of a negative actual EGR value and the EGR vacuum solenoid map controls an EGR vacuum solenoid valve in case of a positive actual EGR value. Therefore, even if the temperature of coolant is less than 70deg.C, the ERG operates so nitric oxide is reduced and air pollution is prevented.

Description

디젤 엔진의 배기 가스 재순환 제어 방법{Method for controlling an exhaust gas recirculation of diesel engine}Method for controlling an exhaust gas recirculation of diesel engine

본 발명은 디젤 엔진의 배기 가스 재순환 제어 방법에 관한 것이며, 특히, 냉각수 온도가 소정의 온도로 냉각되었을 때, 가스 재순환 장치가 소량씩 작동되도록 하는 디젤 엔진의 배기 가스 재순환 제어 방법에 관한 것이다.The present invention relates to a method for controlling the exhaust gas recirculation of a diesel engine, and more particularly, to a method for controlling the exhaust gas recirculation of a diesel engine such that the gas recirculating device is operated in small amounts when the cooling water temperature is cooled to a predetermined temperature.

최근 들어서, 자동차의 배출가스로 인한 대기 오염을 방지하는 것이 환경 위생상 중요한 문제로 대두되고 있으며, 그 대책이 시급히 요청되고 있는 실정이다. 자동차에서 배출되는 가스는 배기 파이프에서 배출되는 배기가스, 기관의 크랭크 케이스에서 발생되는 블로바이(blow-by) 가스, 및 연료 탱크나 기화기등에서 증발하는 연료 증발가스로 구분된다. 이 중에서 배기가스에 포함된 질소 산화물의 발생을 억제하기 위한 방안으로서, 배기가스의 일부를 흡기 매니폴드로 재순환시켜 연소시의 최고온도를 낮춤으로써 질소 산화물의 발생을 억제하는 장치가 대부분의 차량에 구비되어 있는데, 이 장치가 배기가스 재순환 장치이다.In recent years, preventing air pollution due to emissions of automobiles has emerged as an important issue for environmental hygiene, and the situation is urgently required. Gases emitted from automobiles are classified into exhaust gases emitted from exhaust pipes, blow-by gases generated from engine crankcases, and fuel evaporative gases evaporated from fuel tanks or vaporizers. Among these, as a method for suppressing the generation of nitrogen oxide contained in the exhaust gas, a device that suppresses the generation of nitrogen oxide by recycling a part of the exhaust gas to the intake manifold and lowering the maximum temperature during combustion is applied to most vehicles. This device is an exhaust gas recirculation device.

배기가스 재순환 장치는 흡기 매니폴드와 배기 매니폴드를 연결하는 파이프와, 파이프의 중간에 설치되어 배기 매니폴드에서 흡기 매니폴드로 재순환되는 배기가스의 흐름을 선택적으로 단속하는 스로틀 밸브, 및 스로틀 밸브를 선택적으로 개폐시키는 명령을 전달하는 전자 제어장치(ECU)를 포함한다.The exhaust gas recirculation apparatus includes a pipe connecting the intake manifold and the exhaust manifold, a throttle valve installed in the middle of the pipe to selectively regulate the flow of exhaust gas recycled from the exhaust manifold to the intake manifold, and a throttle valve. And an electronic control unit (ECU) for selectively delivering a command to open and close.

이와같이 구성되어서, 배기 매니폴드의 압력을 전자 제어장치가 감지하여 스로틀 밸브의 개도각을 조절하는 명령을 전송하면, 이 명령에 따라 스로틀 밸브가 열려서 배기 매니폴드의 배기가스가 파이프를 통해 흡기 매니폴드로 재순환되고, 다시 엔진으로 유입된다. 이 배기가스는 온도가 높기 때문에 연소시의 최고온도를 낮추어 질소 산화물(NOx)의 발생을 억제하게 된다.In this way, when the electronic control unit senses the pressure of the exhaust manifold and transmits a command to adjust the opening angle of the throttle valve, the throttle valve opens according to the command so that the exhaust gas of the exhaust manifold passes through the intake manifold. Is recycled back to the engine. Since the exhaust gas has a high temperature, the maximum temperature during combustion is lowered to suppress the generation of nitrogen oxides (NOx).

도 1에는 종래의 디젤 엔진에 있어서 배출 가스중 질소 산화물 저감 기술인 배기 가스 재순환 제어 로직이 도시되어 있다. 엔진 회전수와 스로틀 밸브 위치 신호가 EGR 제어 목표 맵(10)에 입력되며, EGR 제어 목표 맵(10)은 도 1에 도시된 바와 같은 계산된 EGR 제어량과 엔진 회전수에 따른 스로틀 밸브 위치 신호(TPS)의 선도가 나타난다. EGR 제어 목표 맵(10)으로부터 계산된 EGR 제어량과 실제 EGR 제어값이 출력 모드(20)로 출력되고, 출력 모드(20)에서 계산된 EGR 제어량으로부터 실제 EGR 제어값이 감산된다.Figure 1 shows the exhaust gas recirculation control logic, which is a technique for reducing nitrogen oxides in exhaust gas in a conventional diesel engine. The engine speed and the throttle valve position signal are input to the EGR control target map 10, and the EGR control target map 10 is the throttle valve position signal according to the calculated EGR control amount and the engine speed as shown in FIG. TPS) is shown. The EGR control amount calculated from the EGR control target map 10 and the actual EGR control value are output to the output mode 20, and the actual EGR control value is subtracted from the EGR control amount calculated in the output mode 20.

이러한 감산값이 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵(30)으로 출력되어, EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵(30)에서 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 듀티값과 EGR 실제값에 대한 선도가 얻어진다. 이 때, EGR 벤트 솔레노이드 맵/EGR 진공 솔레노이드 맵(30)에서, EGR 벤트 솔레노이드 맵은 EGR 실제값이 (-)일 경우에 EGR 벤트 솔레노이드 밸브를 제어하고, EGR 진공 솔레노이드 맵은 EGR 실제값이 (+)일 경우에 EGR 진공 솔레노이드 밸브를 제어한다.This subtracted value is output to the EGR vent solenoid / EGR vacuum solenoid map 30 to obtain a diagram of the EGR vent solenoid / EGR vacuum solenoid duty value and the EGR actual value in the EGR vent solenoid / EGR vacuum solenoid map 30. . At this time, in the EGR vent solenoid map / EGR vacuum solenoid map 30, the EGR vent solenoid map controls the EGR vent solenoid valve when the EGR actual value is (-), and the EGR vacuum solenoid map is the EGR actual solenoid map ( +) Controls the EGR vacuum solenoid valve.

그러나, 상기된 바와 같은 제어 로직을 사용하는 종래의 디젤 엔진의 배기 가스 재순환 제어 방법은 엔진이 충분히 난기가 되지 않았을 때 EGR 장치가 작동되면, 불완전 연소가 발생되어 매출이 배출되기 때문에, 냉각수 온도가 통상 70℃ 이상인 경우에 EGR이 작동되었다. 따라서, 냉각수 온도가 70℃ 미만인 경우에는 배기 가스 중의 질소 산화물이 감소될 수 없다는 문제점이 있었다.However, in the conventional diesel engine exhaust gas recirculation control method using the control logic as described above, when the EGR apparatus is operated when the engine is not sufficiently warmed, the incomplete combustion is generated and the revenue is discharged. EGR was operated when it is usually above 70 ° C. Therefore, when the cooling water temperature is less than 70 ℃ there was a problem that the nitrogen oxides in the exhaust gas can not be reduced.

따라서, 본 발명의 목적은 냉각수 온도가 보다 낮은 온도에서도 EGR이 작동됨으로써, 배기 가스 중의 질소 산화물을 감소시킴으로써, 대기의 오염을 방지할 수 있는 디젤 엔진의 배기 가스 재순환 제어 방법을 제공하는데 있다.Accordingly, an object of the present invention is to provide a method for controlling the exhaust gas recirculation of a diesel engine which can prevent pollution of the atmosphere by reducing the nitrogen oxides in the exhaust gas by operating the EGR even at a lower cooling water temperature.

도 1은 종래의 디젤 엔진의 배기 가스 재순환 제어 로직을 도시한 도면.1 illustrates the exhaust gas recirculation control logic of a conventional diesel engine.

도 2는 본 발명에 따른 디젤 엔진의 배기 가스 재순환 제어 로직을 도시한 도면.Figure 2 shows the exhaust gas recirculation control logic of a diesel engine according to the invention.

상기된 바와 같은 목적은 엔진 회전수와 스로틀 밸브 위치 신호를 계산된 EGR 제어량과 엔진 회전수에 따른 스로틀 밸브 위치 신호의 선도가 나타나는 EGR 제어 목표 맵에 입력하는 단계와; EGR 제어 목표 맵으로부터 계산된 EGR 제어량과 실제 EGR 제어값과 냉각수 온도 맵으로부터 출력되는 냉각수 온도 보정 계수를 승산하는 단계와; 승산된 값으로부터 실제 EGR 제어값을 감산하여, 최종 EGR 목표값을 얻는 단계와; 이러한 감산값을 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵으로 출력하여, EGR 벤트 솔레노이드 밸브 및 EGR 진공 솔레노이드 밸브를 제어하는 단계를 포함하며; 상기 냉각수 온도 보정 계수는 최소 EGR 작동 온도로부터 최대 EGR 작동 온도로 일정한 기울기를 가지는 것을 특징으로 하는 본 발명에 따른 디젤 엔진의 배기 가스 재순환 제어 방법에 의하여 달성될 수 있다.An object as described above includes inputting an engine speed and a throttle valve position signal into an EGR control target map in which a diagram of the calculated EGR control amount and the throttle valve position signal according to the engine speed is indicated; Multiplying the EGR control amount calculated from the EGR control target map with the actual EGR control value and the coolant temperature correction coefficient output from the coolant temperature map; Subtracting the actual EGR control value from the multiplied value to obtain a final EGR target value; Outputting this subtracted value to an EGR vent solenoid / EGR vacuum solenoid map to control the EGR vent solenoid valve and the EGR vacuum solenoid valve; The coolant temperature correction coefficient can be achieved by the exhaust gas recirculation control method of the diesel engine according to the invention, characterized in that it has a constant slope from the minimum EGR operating temperature to the maximum EGR operating temperature.

상기에서, 최소 EGR 작동 온도는 30℃이며, 최대 EGR 작동 온도는 70℃이므로, EGR 장치는 30℃에서 작동을 개시하여, 70℃에서 최대로 작동한다.In the above, since the minimum EGR operating temperature is 30 ° C. and the maximum EGR operating temperature is 70 ° C., the EGR device starts operation at 30 ° C. and operates at 70 ° C. at maximum.

이하, 본 발명의 바람직한 실시예를 명세서에 첨부된 도면을 참조하여 보다 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 디젤 엔진의 배기 가스 재순환 제어 로직을 도시한 도면이다. 도 2에 도시된 바와 같이, 엔진 회전수와 스로틀 밸브 위치 신호(TPS)가 EGR 제어 목표 맵(10)에 입력되며, EGR 제어 목표 맵(10)은 종래에서와 같이 계산된 EGR 제어량과 엔진 회전수에 따른 스로틀 밸브 위치 신호(TPS)의 선도를 나타낸다.2 is a view showing the exhaust gas recirculation control logic of the diesel engine according to the present invention. As shown in Fig. 2, the engine speed and the throttle valve position signal TPS are input to the EGR control target map 10, and the EGR control target map 10 is the calculated EGR control amount and engine rotation as in the prior art. A diagram of the throttle valve position signal TPS is shown according to the number.

EGR 제어 목표 맵(10)으로부터 계산된 EGR 제어량은 냉각수 온도 보정 계수와 승산되고, 냉각수 온도 보정 계수는 도 2에 도시된 냉각수 온도 보정 맵(40)의 선도와 같이 냉각수가 대략 30℃일 때, EGR 작동이 개시되어 대략 70℃일 때까지 일정한 기울기로 서서히 이루어지고, 최대 EGR 작동 온도에서 보정 계수가 1.0으로 된다.When the EGR control amount calculated from the EGR control target map 10 is multiplied by the coolant temperature correction coefficient, and the coolant temperature correction coefficient is approximately 30 ° C as shown in the diagram of the coolant temperature correction map 40 shown in FIG. The EGR operation is started and gradually made with a constant slope until it is approximately 70 ° C., and the correction factor is 1.0 at the maximum EGR operating temperature.

상기된 바와 같이 냉각수 온도 보정 계수와 승산된 계산된 EGR 제어량은 출력 모드(20)로 출력되고, 출력 모드(20)에서 계산된 EGR 제어량으로부터 실제 EGR 제어값이 감산된다.As described above, the calculated EGR control amount multiplied by the coolant temperature correction coefficient is output to the output mode 20, and the actual EGR control value is subtracted from the EGR control amount calculated in the output mode 20.

이러한 감산값이 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵(30)으로 출력되어, EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵(30)에서 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵(30) 듀티값과 EGR 실제값에 대한 선도가 얻어진다. 이 때, EGR 벤트 솔레노이드 맵/EGR 진공 솔레노이드 맵(30)에서, EGR 벤트 솔레노이드 맵은 EGR 실제값이 (-)일 경우에 EGR 벤트 솔레노이드 밸브를 제어하고, EGR 진공 솔레노이드 맵은 EGR 실제값이 (+)일 경우에 EGR 진공 솔레노이드 밸브를 제어한다.These subtracted values are output to the EGR vent solenoid / EGR vacuum solenoid map 30, and the EGR vent solenoid / EGR vacuum solenoid map 30 is used for the duty values and EGR actual values in the EGR vent solenoid / EGR vacuum solenoid map 30. A freshness is obtained. At this time, in the EGR vent solenoid map / EGR vacuum solenoid map 30, the EGR vent solenoid map controls the EGR vent solenoid valve when the EGR actual value is (-), and the EGR vacuum solenoid map is the EGR actual solenoid map ( +) Controls the EGR vacuum solenoid valve.

상기된 바와 같은 본 발명에 따른 디젤 엔진의 배기 가스 재순환 제어 방법에 의하면, 냉각수 온도가 70℃ 미만인 경우에도 배기 가스 재순환 장치가 작동됨으로써, 배기 가스 중의 질소 산화물을 감소시켜 대기의 오염을 방지할 수 있다.According to the exhaust gas recirculation control method of the diesel engine according to the present invention as described above, even when the coolant temperature is less than 70 ℃ operating the exhaust gas recirculation device, it is possible to reduce the nitrogen oxides in the exhaust gas to prevent air pollution. have.

Claims (2)

엔진 회전수와 스로틀 밸브 위치 신호를 계산된 EGR 제어량과 엔진 회전수에 따른 스로틀 밸브 위치 신호의 선도가 나타나는 EGR 제어 목표 맵에 입력하는 단계와;Inputting the engine speed and the throttle valve position signal into an EGR control target map in which a diagram of the calculated EGR control amount and the throttle valve position signal according to the engine speed is displayed; EGR 제어 목표 맵으로부터 계산된 EGR 제어량과 실제 EGR 제어값과 냉각수 온도 맵으로부터 출력되는 냉각수 온도 보정 계수를 승산하는 단계와;Multiplying the EGR control amount calculated from the EGR control target map with the actual EGR control value and the coolant temperature correction coefficient output from the coolant temperature map; 승산된 값으로부터 실제 EGR 제어값을 감산하여, 최종 EGR 목표값을 얻는 단계와;Subtracting the actual EGR control value from the multiplied value to obtain a final EGR target value; 이러한 감산값을 EGR 벤트 솔레노이드/EGR 진공 솔레노이드 맵으로 출력하여, EGR 벤트 솔레노이드 밸브 및 EGR 진공 솔레노이드 밸브를 제어하는 단계를 포함하며;Outputting this subtracted value to an EGR vent solenoid / EGR vacuum solenoid map to control the EGR vent solenoid valve and the EGR vacuum solenoid valve; 상기 냉각수 온도 보정 계수는 최소 EGR 작동 온도로부터 최대 EGR 작동 온도로 일정한 기울기를 가지는 것을 특징으로 하는 디젤 엔진의 배기 가스 재순환 제어 방법.And said coolant temperature correction coefficient has a constant slope from a minimum EGR operating temperature to a maximum EGR operating temperature. 제 1 항에 있어서, 최소 EGR 작동 온도는 30℃이며, 최대 EGR 작동 온도는 70℃인 것을 특징으로 하는 디젤 엔진의 배기 가스 재순환 제어 방법.The method of claim 1, wherein the minimum EGR operating temperature is 30 ° C and the maximum EGR operating temperature is 70 ° C.
KR1019990035653A 1999-08-26 1999-08-26 Method for controlling an exhaust gas recirculation of diesel engine KR100313008B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030016839A (en) * 2001-08-22 2003-03-03 현대자동차주식회사 Air Intake and Exhaust system for automobile
KR100412692B1 (en) * 2001-10-08 2003-12-31 현대자동차주식회사 Apparatus for correction exhaust gas recirculation of diesel vehicle and thereof
KR20040048720A (en) * 2002-12-04 2004-06-10 현대자동차주식회사 Method of correcting boost pressure for electronic type diesel engine

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JPS5643454U (en) * 1979-09-10 1981-04-20
JPH04119349A (en) * 1990-09-11 1992-04-20 Fuji Photo Film Co Ltd Silver halide photographic sensitive material
KR19980020531A (en) * 1996-09-09 1998-06-25 김영귀 Exhaust gas recirculation system for diesel engine
KR19990028549U (en) * 1997-12-26 1999-07-15 양재신 Air-fuel ratio control system according to exhaust gas recirculation amount

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030016839A (en) * 2001-08-22 2003-03-03 현대자동차주식회사 Air Intake and Exhaust system for automobile
KR100412692B1 (en) * 2001-10-08 2003-12-31 현대자동차주식회사 Apparatus for correction exhaust gas recirculation of diesel vehicle and thereof
KR20040048720A (en) * 2002-12-04 2004-06-10 현대자동차주식회사 Method of correcting boost pressure for electronic type diesel engine

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