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KR100287683B1 - Method for controlling air fuel ratio of engine - Google Patents

Method for controlling air fuel ratio of engine Download PDF

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Publication number
KR100287683B1
KR100287683B1 KR1019960079826A KR19960079826A KR100287683B1 KR 100287683 B1 KR100287683 B1 KR 100287683B1 KR 1019960079826 A KR1019960079826 A KR 1019960079826A KR 19960079826 A KR19960079826 A KR 19960079826A KR 100287683 B1 KR100287683 B1 KR 100287683B1
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South Korea
Prior art keywords
fuel ratio
air fuel
air
engine
target
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KR1019960079826A
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Korean (ko)
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KR19980060468A (en
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문귀원
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이계안
현대자동차주식회사
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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
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1404—Fuzzy logic control
    • 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)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Software Systems (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Abstract

PURPOSE: A method for controlling an actual air fuel ratio of an engine is provided to enhance combustion efficiency by controlling precisely the air fuel ratio and by injecting a mixing fuel gas of a target air fuel ratio to a combustion chamber. CONSTITUTION: If a canister purge control is not performed through an ECU(Electronic Control Unit), an actual air fuel ratio is identical to a target air fuel ratio. If the target air fuel ratio is a theoretical air fuel ratio, the actual air fuel ratio is controlled to be equal to the theoretical air fuel ratio. If the target air fuel ratio is a lean air fuel ratio, the actual air fuel ratio is controlled to be equal to the lean air fuel ratio. If the canister purge control is performed through the ECU, the control when the target air fuel ratio is the theoretical air fuel ratio differs from the control when the target air fuel ratio is the lean air fuel ratio.

Description

엔진의 공연비 제어 방법How to control the air-fuel ratio of the engine

본 발명은 엔진에 공급되는 혼합기의 공연비 제어 방법에 관한 것으로서, 보다 상세하게는 엔진의 희박 연소 여부와 캐니스터 퍼지 제어 여부에 따라 혼합기의 공연비를 제어하는 방법에 관한 것이다.The present invention relates to a method for controlling the air-fuel ratio of a mixer supplied to an engine, and more particularly, to a method for controlling the air-fuel ratio of a mixer according to whether or not the engine is lean combustion and canister purge control.

일반적으로 엔진은 실린더와 실린더 헤드 및 상기 실린더 내에서 왕복 운동하는 피스톤의 사이에 형성되는 연소실에서 연료를 연소시켜 발생된 폭발력을 상기 피스톤에 연결된 커넥팅 로드를 통해 크랭크샤프트를 회전시킴으로서 열에너지를 기계적인 회전력으로 변환하는 장치이다.In general, an engine rotates a crankshaft through a connecting rod connected to the piston to explode the force generated by burning fuel in a combustion chamber formed between a cylinder and a cylinder head and a piston reciprocating in the cylinder, thereby rotating mechanical energy. To convert.

여기서, 상기한 엔진의 연소실에는 공기와 연료가 일정 비율 즉, 14.7:1 정도의 비율로 섞여 인입되는 바, 상기한 비율은 공기와 가솔린의 혼합 시 연소실에서의 폭발이 가장 효율적으로 발생될 뿐만 아니라 배기 가스에 의한 대기 오염을 최소로 줄일 수 있는 이론 공연비이다.In this case, air and fuel are mixed and introduced into the combustion chamber of the engine at a ratio, that is, about 14.7: 1. The ratio is not only the most efficient explosion in the combustion chamber occurs when air and gasoline are mixed. It is a theoretical air-fuel ratio that can minimize air pollution by exhaust gas.

또한, 연료를 절감하기 위하여 희박 공연비의 혼합기가 엔진의 연소실로 제공되는 바, ECU는 흡입되는 공기량에 따른 연료 분사량을 조절하여 엔진의 희박 연소가 제어될 수 있도록 되어 있다.In addition, in order to save fuel, a lean air-fuel ratio mixer is provided to the combustion chamber of the engine, and the ECU adjusts the fuel injection amount according to the amount of air sucked in so that the lean combustion of the engine can be controlled.

오늘날, 날로 심각해져 가는 대기 오염을 줄이기 위하여 연료탱크에서 증발되는 연료의 증발 가스에 대한 대책으로서 차아콜 캐니스터 방식이 사용되고 있는 바, 이는 연료탱크에서 증발된 증발 가스가 캐니스터의 활성탄에 흡착되도록 하고, 엔진이 정상적으로 가동되면 ECU는 캐니스터 퍼지 제어를 하여 상기 증발 가스가 흡기 매니폴드로 유입되어 엔진의 연소실로 유입되도록 하는 장치이다.Today, the Charcoal canister method is used as a countermeasure against the evaporation gas of the fuel evaporated from the fuel tank to reduce the serious air pollution, which allows the evaporated gas evaporated from the fuel tank to be adsorbed on the canister's activated carbon and the engine When the ECU is normally operated, the ECU performs canister purge control so that the boil-off gas flows into the intake manifold and flows into the combustion chamber of the engine.

즉, 상기한 증발 가스는 미연소된 탄화수소 성분을 대량으로 함유하고 있고, 상기 미연소된 탄화수소는 혼합기의 공연비에 영향을 주게 되는 바, ECU가 이를 고려하지 않은 채 공연비를 설정하면 목표 공연비에 비해 농후한 공연비로 혼합기가 연소실로 분사된다.That is, the above-mentioned evaporated gas contains a large amount of unburned hydrocarbon components, and the unburned hydrocarbons affect the air-fuel ratio of the mixer. When the ECU sets the air-fuel ratio without considering this, the air-fuel ratio is compared with the target air-fuel ratio. The mixer is injected into the combustion chamber at a rich air-fuel ratio.

특히, 이른 공연비나 농후 공연비에서는 상기한 증발 가스의 영향을 덜 받지만 희박 공연비로 저속 운전할 때에는 상기한 증발 가스에 포함된 탄화수소의 영향을 많이 받게 되어 ECU는 원하는 제어를 할 수 없게 되기 때문에 결과적으로 더 많은 유해 배기 가스가 대기 중으로 배출되게 되는 문제점이 있다.In particular, the early air-fuel ratio or the rich air-fuel ratio is less affected by the above-mentioned evaporation gas, but when operating at low speeds with a lean air-fuel ratio, the hydrocarbons contained in the above-mentioned evaporation gas are more affected. There is a problem that many harmful exhaust gases are emitted to the atmosphere.

따라서, 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, 목표 공연비와 캐니스터 퍼지 제어 및 드로틀 밸브의 개도량에 따라 목표 공연비를 위한 실제 공연비를 각각 분리하여 제어하도록 한 엔진의 공연비 제어 방법을 제공함에 그 목적이 있다.Therefore, the present invention has been made to solve the above problems, the air-fuel ratio control method of the engine to separate and control the actual air-fuel ratio for the target air-fuel ratio according to the target air-fuel ratio and the canister purge control and the opening amount of the throttle valve, respectively. The purpose is to provide.

도 1은 본 발명에 따른 엔진의 공연비 제어 방법을 도시한 순서도,1 is a flowchart illustrating a method for controlling an air-fuel ratio of an engine according to the present invention;

도 2는 본 발명에 따른 제어 방법으로 엔진의 공연비를 제어할 때 드로틀 밸브의 개도량에 대한 실제 공연비의 그래프도로서,2 is a graph of the actual air-fuel ratio with respect to the opening amount of the throttle valve when controlling the air-fuel ratio of the engine by the control method according to the present invention,

도 2a는 혼합기가 이론 공연비일 경우,Figure 2a shows that when the mixer is the theoretical air-fuel ratio,

도 2b는 혼합기가 희박 공연비일 경우의 그래프도이다.2B is a graph of the case where the mixer is a lean air-fuel ratio.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 엔진의 공연비 제어방법은 엔진의 희박 연소시 캐니스터 퍼지 제어를 행하는 구간에서는 드로틀 밸브의 개도량과 실제 공연비가 비례 관계를 가지도록 하여 목표 공연비의 혼합기가 연소실로 분사되도록 하는 것을 특징으로 한다.The air-fuel ratio control method of the engine according to the present invention for achieving the above object is a mixer of the target air-fuel ratio to have a proportional relationship between the opening amount of the throttle valve and the actual air-fuel ratio in the section performing canister purge control during lean combustion of the engine It characterized in that the injection into the combustion chamber.

이하, 첨부된 도면을 참조하여 본 발명의 실시 예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

일반적으로 엔진의 공연비는 ECU에 의해 제어되는 바, 상기 ECU는 자동차의 성능과 주행 조건에 적절한 공연비를 매핑하고 있다가 드로틀 밸브에서 개도량에 따라 연료 분사량을 조절하여 적절한 공연비의 혼합기가 연소실로 분사되도록 하고 있다.In general, the air-fuel ratio of the engine is controlled by the ECU, and the ECU maps an air-fuel ratio appropriate to the performance and driving conditions of the vehicle, and then adjusts the fuel injection amount according to the opening amount at the throttle valve, so that an appropriate air-fuel ratio mixer is injected into the combustion chamber. I am trying to.

도 1은 본 발명에 따른 엔진의 공연비 제어 방법을 도시하고 있는 바, ECU를 통해 캐니스터 퍼지 제어가 이루어지고 있지 않으면 실제 공연비와 목표 공연비를 동일하게 하는 바, 목표 공연비가 이론 공연비이면 실제 공연비도 이론 공연비와 동일하고, 목표 공연비가 희박 공연비이면 실제 공연비도 희박 공연비와 동일하게 제어한다.Figure 1 shows the air-fuel ratio control method of the engine according to the present invention, if the canister fuzzy control is not made through the ECU bar the actual air-fuel ratio and the target air-fuel ratio, if the target air-fuel ratio is theoretical air-fuel ratio theory If the air-fuel ratio is the same and the target air-fuel ratio is a lean air-fuel ratio, the actual air-fuel ratio is also controlled to be the same as the lean air-fuel ratio.

그러나, ECU를 통해 캐니스터 퍼지 제어가 이루어지고 있으면 목표 공연비가 이론 공연비일 때와 희박 공연비일 때가 각각 다르게 제어된다.However, when the canister fuzzy control is performed through the ECU, when the target air fuel ratio is a theoretical air fuel ratio and when the lean air fuel ratio is controlled differently.

즉, 상기 목표 공연비가 이론 공연비이면 실제 공연비는 목표 공연비인 이론 공연비보다 일정 정도 희박하게 제어되고, 상기 목표 공연비가 희박 공연비이면 실제 공연비는 드로틀 밸브의 개도량과 비례하게 제어되는 바, 상기 드로틀 밸브의 개도량이 적으면 실제 공연비는 목표 공연비보다 농후해지고 상기 드로틀 밸브의 개도량이 많으면 실제 공연비는 목표 공연비보다 희박해진다.That is, when the target air-fuel ratio is a theoretical air-fuel ratio, the actual air-fuel ratio is controlled to be thinner than a theoretical air-fuel ratio, which is a target air-fuel ratio, and when the target air-fuel ratio is a lean air-fuel ratio, the actual air-fuel ratio is controlled in proportion to the opening amount of the throttle valve. If the opening amount is small, the actual air-fuel ratio is richer than the target air-fuel ratio. If the opening amount of the throttle valve is large, the actual air-fuel ratio is thinner than the target air-fuel ratio.

도 2는 상기와 같은 방법으로 공연비를 제어할 때의 드로틀 밸브의 개도량에 따른 실제 공연비가 도시되어 있는 바, 도 2a에는 혼합기가 이론 공연비일 경우가 도시되어 있고, 도 2b는 혼합기가 희박 공연비일 경우가 도시되어 있다.Figure 2 shows the actual air-fuel ratio according to the opening amount of the throttle valve when controlling the air-fuel ratio in the above manner, Figure 2a shows a case where the mixer is the theoretical air-fuel ratio, Figure 2b is a mixer air-fuel ratio One case is shown.

이상과 같이, 본 발명은 캐니스터 퍼지 제어가 행해지는 동안 실제 공연비를 정밀하게 제어하여 정확한 목표 공연비의 혼합기가 연소실로 분사되도록 함으로써, 연소효율을 향상시킴과 아울러 완전연소를 이루어 유해 배기가스의 배출량을 절감시킬 수 있는 효과가 있다.As described above, the present invention precisely controls the actual air-fuel ratio while the canister purge control is performed so that the mixer of the correct target air-fuel ratio is injected into the combustion chamber, thereby improving combustion efficiency and completely burning the exhaust gas of harmful exhaust gas. There is an effect that can be reduced.

Claims (1)

엔진의 희박 연소시 캐니스터 퍼지 제어를 행하는 구간에서는 드로틀 밸브의 개도량과 실제 공연비가 비례 관계를 가지도록 하여 목표 공연비의 혼합기가 연소실로 분사되도록 하는 것을 특징으로 하는 엔진의 공연비 제어 방법.An air-fuel ratio control method for an engine, characterized in that the mixing of the target air-fuel ratio is injected into the combustion chamber so that the opening amount of the throttle valve and the actual air-fuel ratio have a proportional relationship in a section in which canister purge control is performed during lean combustion of the engine.
KR1019960079826A 1996-12-31 1996-12-31 Method for controlling air fuel ratio of engine KR100287683B1 (en)

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KR100287683B1 true KR100287683B1 (en) 2001-10-24

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