KR100882637B1 - Fuel's low vaporizing character estimating method of an engine - Google Patents

Fuel's low vaporizing character estimating method of an engine Download PDF

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KR100882637B1
KR100882637B1 KR1020070081618A KR20070081618A KR100882637B1 KR 100882637 B1 KR100882637 B1 KR 100882637B1 KR 1020070081618 A KR1020070081618 A KR 1020070081618A KR 20070081618 A KR20070081618 A KR 20070081618A KR 100882637 B1 KR100882637 B1 KR 100882637B1
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engine
fuel
low
roughness
supplied
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KR1020070081618A
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Korean (ko)
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강인석
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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
    • F02D41/30—Controlling fuel injection
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • 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
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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

Abstract

A method for estimating low-vaporizing fuel in an engine is provided to compensate the fuel injection amount of the engine more accurately by determining whether to supply low-vaporizing fuel depending on the operating state of the engine. A method for estimating low-vaporizing fuel of an engine comprises the steps of: producing engine roughness by measuring the rotation angular speed of the engine crank shaft; determining that low-vaporizing fuel is supplied to the engine when the engine roughness is greater than the standard value; correcting the injection amount of low-vaporizing fuel when it is determined that the low-vaporizing fuel is supplied; determining whether an air volume compensation value of an idle speed actuator is greater than the threshold value when the engine roughness is less than the standard value; and determining that the fuel supplied to the engine is low-vaporizing fuel when the air volume compensation value is greater than the threshold level.

Description

엔진의 저기화성 연료 판정 방법{Fuel's Low Vaporizing Character Estimating Method of an Engine}Fuel's Low Vaporizing Character Estimating Method of an Engine

본 발명은 엔진에 사용되는 연료 중 저기화성 연료, 즉 연료의 품질이 떨어지는 경우에, 엔진으로 공급되는 연료가 저기화성 연료임을 판단하여, 엔진의 원활한 동작을 위해 연료분사량을 보정하도록 하는 기술에 관한 것이다.The present invention relates to a technique for determining the fuel injection amount for smooth operation of the engine by determining that the fuel supplied to the engine is a low-vaporization fuel, that is, when the quality of the fuel is poor, among the fuels used in the engine. will be.

국외의 타국가 지역에서는 종종 연료의 품질 편차가 매우 크고, 연료의 품질이 매우 떨어지는 저기화성 연료가 엔진에 공급되는 경우에는, 적절한 연료분사량 보정을 실시하지 않으면 원활한 엔진의 작동성을 확보하기 어렵다.In other regions of the world, when the engine is supplied with a low-vaporization fuel having a very large fuel quality deviation and a very low fuel quality, it is difficult to ensure smooth engine operation without proper fuel injection correction.

종래에는 상기와 같은 저기화성 연료가 엔진에 공급되는 것에 대비하여, 도 1에 도시된 바와 같이, 엔진의 시동시 엔진의 회전수 상승 속도를 감지하여, 상승 속도가 기준치 이하로 느린 경우, 저기화성 연료에 의한 연소 불안으로 판정하여 연료를 증량하는 보정을 실시하도록 하고 있다.Conventionally, in contrast to the above-described low-vaporizable fuel is supplied to the engine, as shown in Figure 1, when the engine speed of engine speed is sensed when starting the engine, when the rising speed is lower than the reference value, It is determined that the combustion is unstable by the fuel, and the correction is performed to increase the fuel.

즉, 엔진의 시동시에 저기화성 연료인지의 여부를 판정하여, 엔진의 시동 직후 및 엔진의 웜업시는 물론, 차량의 가속시 등의 경우에도 연료분사량을 적절히 증량하도록 하는 것이다.That is, it is determined whether or not it is a low-vaporization fuel at the start of the engine, so that the fuel injection amount is appropriately increased immediately after the start of the engine and at the time of engine warm-up as well as at the time of acceleration of the vehicle.

그런데, 상기한 바와 같은 방법으로 저기화성 연료인지의 여부를 판정하는 방법은, 엔진의 시동시라는 짧은 시간 동안에 이루어져서, 그 판정 결과를 시동후까지 지속적으로 사용하기에는 신뢰성이 떨어지며, 특히 시동중의 엔진 회전수 상승속도의 하강 경향은 단지 저기화성 연료라는 이유 때문만이 아니라 엔진에 미리 정해져 있는 시동연료량의 맵핑이 적절하지 못한 경우에도 발생할 수 있어서, 엔진 회전수 상승속도의 하강이 반드시 저기화성 연료에 기인한 것으로 확신하기에는 다소 무리가 있다.By the way, the method of determining whether it is a low vaporization fuel by the above-mentioned method is made in the short time called the start of an engine, and it is inferior to the reliability to use the determination result until after starting, especially the engine which is starting. The tendency of the rate of speed increase to fall may occur not only because of the low vaporization fuel, but also when the pre-determined amount of starting fuel amount is not appropriate for the engine, so that the rate of speed increase of the speed of engine speed rises to the low temperature fuel. It's a bit too convincing to be attributed.

물론, 상기한 바와 같이 다소 신뢰성이 떨어지는 판정 결과에 따라 이후의 엔진 작동시에 연료량을 보정하는 기준으로 활용하는 것은 연비나 엔진의 출력에 있어서 최적화된 결과를 얻기 어렵게 한다.Of course, the use of the fuel as a criterion for correcting the fuel amount in subsequent engine operation according to the somewhat inferior determination result as described above makes it difficult to obtain an optimized result in fuel economy or engine output.

본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, 저기화성 연료인지의 여부에 대한 판정의 불확실성을 내포할 수 밖에 없는 엔진 시동시의 판정을 배제하고, 엔진의 시동이 완료된 후에 엔진의 작동상태로부터 저기화성 연료가 엔진에 공급되고 있는지의 여부를 판정할 수 있도록 함으로써, 보다 정확한 판정으로 엔진의 연료분사량 보정을 실시할 수 있도록 하여 엔진의 출력 및 연비를 향상시킬 수 있도록 한 엔진의 저기화성 연료 판정 방법을 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and excludes the determination at engine start-up, which inevitably includes uncertainty in the determination as to whether or not it is a low-evaporation fuel, and after engine start-up is completed, It is possible to determine whether or not low-vaporizable fuel is being supplied to the engine from the operating state, so that the fuel injection amount of the engine can be corrected with a more accurate determination, thereby improving the engine output and fuel efficiency. It is an object of the present invention to provide a method of determining a fuel for Mars.

상기한 바와 같은 목적을 달성하기 위한 본 발명 엔진의 저기화성 연료 판정 방법은 The low vaporization fuel determination method of the engine of the present invention for achieving the above object is

엔진의 시동이 완료되면, 엔진의 크랭크샤프트 회전 각속도를 측정하여, 폭발행정들에 의한 각가속도들의 변화량인 엔진러프니스를 산출하는 단계와;Measuring engine crankshaft rotational angular velocity when the engine is started, and calculating engine roughness which is a change amount of angular accelerations by explosion strokes;

상기 엔진러프니스가 미리 정해진 기준값 이상인 경우, 저시동성 연료가 엔진에 공급되고 있는 것으로 판단하는 단계와;Determining that low starting fuel is being supplied to the engine when the engine roughness is equal to or greater than a predetermined reference value;

엔진에 공급되는 연료가 저시동성 연료인 것으로 판정되면, 저시동성 연료에 대응한 연료분사량 보정을 실시하는 것을 특징으로 한다.When it is determined that the fuel supplied to the engine is a low starting fuel, the fuel injection amount correction corresponding to the low starting fuel is performed.

또한, 본 발명은 상기 엔진러프니스가 기준값 이상인지를 판단한 결과 엔진러프니스가 기준값 이하인 경우, 아이들스피드액츄에이터의 공기량 보정값이 한계 치 이상인지를 더 판단하여, 한계치 이상인 경우 엔진에 공급되는 연료가 저시동성 연료인 것으로 판정하는 단계를 더 포함하여 구성될 수 있다.The present invention further determines whether the air speed correction value of the idle speed actuator is greater than or equal to the threshold value when the engine roughness is less than or equal to the reference value. And determining to be a low starting fuel.

본 발명은 엔진러프니스와 아이들스피드액츄에이터의 공기량 보정값을 함께 고려하여, 엔진에 저기화성 연료가 공급되고 있는 상황인지의 여부를 보다 정확하게 판정할 수 있도록 함으로써, 이를 기준으로 실시되는 이후의 엔진 연료분사량 보정이 보다 정확하게 이루어질 수 있도록 하여 상대적으로 엔진의 출력 및 연비를 향상시킬 수 있다.The present invention allows a more accurate determination of whether or not a low vaporizable fuel is being supplied to the engine by considering the air roughness correction value of the engine roughness and the idle speed actuator. By making injection amount correction more accurate, it is possible to relatively improve the engine output and fuel economy.

도 2를 참조하면, 본 발명 실시예는 엔진의 시동이 완료되면, 엔진의 크랭크샤프트 회전 각속도를 측정하여, 폭발행정들에 의한 각가속도들의 변화량인 엔진러프니스(engine roughness)를 산출하는 단계를 수행한다.Referring to FIG. 2, when the engine is started, the present invention measures the crankshaft rotational angular velocity of the engine to calculate engine roughness, which is an amount of change in angular accelerations due to explosion strokes. do.

즉, 엔진의 작동시에 각 실린더의 폭발행정에서는 크랭크샤프트를 회전시키는 토크가 발생하는데, 저기화성 연료로 인하여 연소가 원활히 이루어지지 못하는 경우 또는 실화의 경우에는 당해 실린더의 폭발행정에서 발생되는 토크가 상대적으로 상당히 작거나 없어서 크랭크샤프트의 각가속도가 작거나 없게 되어, 다른 폭발행정에서의 각가속도와의 차이가 발생하게 되므로, 이러한 경향을 나타내는 엔진러프니스를 산출하는 것이다.That is, when the engine is operated, a torque for rotating the crankshaft is generated in the explosion stroke of each cylinder, and when the combustion is not performed smoothly due to the low vaporization fuel or in the case of misfire, the torque generated in the explosion stroke of the cylinder is generated. The relative roughness is relatively small or absent, so that the angular acceleration of the crankshaft is small or absent, resulting in a difference from the angular acceleration in other explosion strokes.

상기한 바와 같이 산출된 엔진러프니스가 일정한 수준 즉, 미리 정해진 기준 값 이상인 경우, 저시동성 연료가 엔진에 공급되고 있는 것으로 판단하도록 한다.When the engine roughness calculated as described above is at a certain level, that is, the predetermined reference value or more, it is determined that the low starting fuel is being supplied to the engine.

상기 기준값은 실험 및/또는 해석에 의해 적절히 정해져서 미리 엔진 컨트롤러에 입력된다.The reference value is appropriately determined by experiment and / or analysis and input to the engine controller in advance.

물론, 상기와 같은 판정 결과 엔진에 공급되는 연료가 저시동성 연료인 것으로 판정되면, 저시동성 연료에 대응한 연료분사량 보정을 실시하는 바, 이는 종래의 기술과 같다.Of course, if it is determined that the fuel supplied to the engine is a low starting fuel, the fuel injection amount correction corresponding to the low starting fuel is performed, which is the same as in the prior art.

따라서, 종래에 엔진의 시동시라는 짧고 불안정한 시기에 저기화성 연료인지의 여부를 판정하는 경우보다 더 정확하고 신뢰성있는 판정 결과를 얻을 수 있다.Therefore, a more accurate and reliable determination result can be obtained than in the case of judging whether or not it is a low vaporization fuel at a short and unstable time when the engine is started.

본 실시예는 여기에 더하여, 상기 엔진러프니스가 기준값 이상인지를 판단한 결과 엔진러프니스가 기준값 이하인 경우, 아이들스피드액츄에이터(ISA: Idle Speed Actuator)의 공기량 보정값이 한계치 이상인지를 판단하여, 한계치 이상인 경우에도 엔진에 공급되는 연료가 저시동성 연료인 것으로 판정하도록 하고 있다.In this embodiment, in addition, when the engine roughness is equal to or less than the reference value, the engine roughness is equal to or less than the reference value. In this embodiment, it is determined whether the air amount correction value of the idle speed actuator (ISA) is equal to or greater than the threshold value. Even in this case, it is determined that the fuel supplied to the engine is a low starting fuel.

즉, 아이들스피드액츄에이터는 엔진의 목표 회전수를 추종하도록 하기 위해 엔진 컨트롤러의 제어를 받아 흡입 공기량을 점차 증가키는 공기량 보정을 하게 되는데, 이와 같은 공기량 보정값이 어느 수준 이상이 되어 상기 한계치로 정해진 값을 넘어서는 경우에는, 이를 저기화성 연료가 엔진에 공급되고 있기 때문에, 공기량을 증대하고 상응하는 연료분사를 하였음에도 불구하고 목표로 하는 엔진 회전수에 도달하지 못하여 계속적으로 공기량 보정값이 증가한 것으로 판단하도록 한 것이다.In other words, the idle speed actuator is controlled by the engine controller to follow the target rotational speed of the engine, and the air volume correction is performed to gradually increase the intake air amount. In the case of exceeding the value, since it is supplied to the engine, it is determined that the air volume correction value is continuously increased because the amount of air is increased and the target engine speed is not reached even though the corresponding fuel injection is performed. It is.

따라서, 본 실시예에 의하면 상기한 엔진러프니스와 아이들스피드액츄에이터의 공기량 보정값을 함께 고려하여, 엔진에 저기화성 연료가 공급되고 있는 상황인지의 여부를 보다 정확하게 판정할 수 있도록 함으로써, 이를 기준으로 실시되는 이후의 연료분사량 보정이 보다 정확하게 이루어질 수 있어서 상대적으로 엔진의 출력 및 연비를 향상시킬 수 있다.Therefore, according to the present embodiment, it is possible to more accurately determine whether or not the low vaporization fuel is being supplied to the engine in consideration of the air roughness correction values of the engine roughness and the idle speed actuator. Fuel injection correction can be made more precisely after being carried out, thereby relatively improving engine power and fuel economy.

도 1은 종래 기술에 의한 엔진의 저기화성 연료 판정 방법을 예시한 도면,1 is a diagram illustrating a method for determining a low vaporization fuel of an engine according to the prior art;

도 2는 본 발명에 따른 엔진의 저기화성 연료 판정 방법을 설명한 순서도이다.2 is a flowchart illustrating a method for determining a low vaporization fuel of an engine according to the present invention.

Claims (2)

엔진의 시동이 완료되면, 엔진의 크랭크샤프트 회전 각속도를 측정하여, 폭발행정들에 의한 각가속도들의 변화량인 엔진러프니스를 산출하는 단계와;Measuring engine crankshaft rotational angular velocity when the engine is started, and calculating engine roughness which is a change amount of angular accelerations by explosion strokes; 상기 엔진러프니스가 미리 정해진 기준값 이상인 경우, 저시동성 연료가 엔진에 공급되고 있는 것으로 판단하는 단계와;Determining that low starting fuel is being supplied to the engine when the engine roughness is equal to or greater than a predetermined reference value; 엔진에 공급되는 연료가 저시동성 연료인 것으로 판정되면, 저시동성 연료에 대응한 연료분사량 보정을 실시하는 단계와;If it is determined that the fuel supplied to the engine is a low starting fuel, performing fuel injection amount correction corresponding to the low starting fuel; 상기 엔진러프니스가 기준값 이상인지를 판단한 결과 엔진러프니스가 기준값 이하인 경우, 아이들스피드액츄에이터의 공기량 보정값이 한계치 이상인지를 더 판단하여, 한계치 이상인 경우 엔진에 공급되는 연료가 저시동성 연료인 것으로 판정하는 단계;If it is determined that the engine roughness is equal to or greater than the reference value, and the engine roughness is equal to or less than the reference value, it is further determined whether the air amount correction value of the idle speed actuator is equal to or greater than the threshold value, and when the engine roughness is equal to or greater than the threshold value, the fuel supplied to the engine is a low starting fuel. Doing; 를 포함하는 것을 특징으로 하는 엔진의 저기화성 연료 판정 방법.Low vaporization fuel determination method of the engine comprising a. 삭제delete
KR1020070081618A 2007-08-14 2007-08-14 Fuel's low vaporizing character estimating method of an engine KR100882637B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08284708A (en) * 1995-04-14 1996-10-29 Nissan Motor Co Ltd Fuel injector for engine
KR19980015147A (en) * 1996-08-20 1998-05-25 박병재 Method for controlling fuel injection amount of internal combustion engine
JP2001182591A (en) 1999-12-24 2001-07-06 Honda Motor Co Ltd Control device for internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08284708A (en) * 1995-04-14 1996-10-29 Nissan Motor Co Ltd Fuel injector for engine
KR19980015147A (en) * 1996-08-20 1998-05-25 박병재 Method for controlling fuel injection amount of internal combustion engine
JP2001182591A (en) 1999-12-24 2001-07-06 Honda Motor Co Ltd Control device for internal combustion engine

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