KR20130060565A - Fuel injection correction device for flex fuel vehicle, and control method thereof - Google Patents

Fuel injection correction device for flex fuel vehicle, and control method thereof Download PDF

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KR20130060565A
KR20130060565A KR1020110126692A KR20110126692A KR20130060565A KR 20130060565 A KR20130060565 A KR 20130060565A KR 1020110126692 A KR1020110126692 A KR 1020110126692A KR 20110126692 A KR20110126692 A KR 20110126692A KR 20130060565 A KR20130060565 A KR 20130060565A
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fuel
vehicle
ethanol concentration
time period
level sensor
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KR101745016B1 (en
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박군철
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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
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F02D19/0652—Biofuels, e.g. plant oils
    • F02D19/0655—Biofuels, e.g. plant oils at least one fuel being an alcohol, e.g. ethanol
    • 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
    • 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
    • F02D41/1454—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 an oxygen content or concentration or the air-fuel ratio
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

PURPOSE: A fuel measuring device and a control method thereof are provided to improve driving performance by properly compensating fuel amount with learning ethanol concentration even when an error occurs in a fuel sensor. CONSTITUTION: A fuel measuring device for variable fuel vehicles comprises a fuel level sensor(110), an oxygen sensor(120), and a control unit(130). The fuel level sensor detects the fuel level of a fuel tank. The oxygen sensor detects oxygen concentration in exhaust gas discharged from an engine. The control unit determines whether or not vehicles need fuel by analyzing the oxygen concentration if errors occur in the fuel level sensor. The control unit performs the learning of ethanol concentration, and performs feed-back control in an air-fuel ratio on the basis of the ethanol concentration. [Reference numerals] (110) Fuel level sensor; (120) Oxygen sensor; (130) Control unit; (132) Refueling determining unit; (134) Ethanol concentration learning module; (136) Air-fuel ratio feedback control module; (140) Engine

Description

가변연료차량의 연료량 보정장치 및 이의 제어방법{Fuel injection correction device for Flex Fuel Vehicle, and control method thereof}Fuel injection correction device for flex fuel vehicle, and control method

본 발명은 가변연료차량의 연료량 보정장치 및 이의 제어방법에 관한 것으로, 구체적으로는 에탄올농도 학습로직에 의한 가변연료차량의 연료량 보정장치 및 이의 제어방법에 관한 것이다.The present invention relates to a fuel amount correction device and a control method thereof for a variable fuel vehicle, and more particularly, to a fuel amount correction device and a control method thereof for a variable fuel vehicle by the ethanol concentration learning logic.

전 세계적으로 원유 가격이 급등하면서 값비싼 가솔린 연료 대신 에탄올 연료에 대한 수요가 브라질, 중국, 동남아, 미국 등지에서 급등하고 있다. 이에 따라 전세계적으로 가변연료 차량(FFV: Flex Fuel Vehicle)에 대한 수요가 급증하는 추세이다.As crude oil prices soar around the world, demand for ethanol fuel instead of expensive gasoline fuels is skyrocketing in Brazil, China, Southeast Asia and the United States. As a result, demand for flex fuel vehicles (FFVs) is increasing worldwide.

가변연료차량(FFV)에 사용되는 연료인 에탄올은 이론 공연비가 9:1로 가솔린대비 많은 연료량이 필요하고, 에탄올농도 학습을 통해 에탄올농도에 따른 연료량의 보정을 수행한다. 가변연료차량에서 에탄올농도 학습은 일반적으로 연료레벨센서를 통해 주유 여부를 판단하여 이루어진다. Ethanol, which is a fuel used for variable fuel vehicles (FFV), has a theoretical air-fuel ratio of 9: 1 and requires more fuel than gasoline, and the ethanol concentration is corrected according to the ethanol concentration. In a variable fuel vehicle, ethanol concentration learning is generally performed by determining whether fuel is supplied through a fuel level sensor.

그러나 종래 에탄올농도 학습로직은, 연료레벨센서에 오류가 발생하는 경우에는, 시동 직후 및 공기과잉률 편차가 일정 수준에 도달한 경우에만 수행되기 때문에 적절한 에탄올농도 학습이 수행되지 못하는 한계를 가진다.However, the conventional ethanol concentration learning logic has a limitation in that proper ethanol concentration learning cannot be performed because an error occurs in the fuel level sensor immediately after start-up and only when the air excess rate deviation reaches a certain level.

또한, 연료레벨센서에 오류가 발생하는 경우, 종래 에탄올농도 학습로직은 에탄올농도 학습을 위해서는 시동을 반복 수행해야 하기 때문에 반복 수행하는 과정에서 학습에 오류가 생길 여지가 있고, 시동시에만 학습이 이루어지기 때문에 엔진을 정지하지 않고 주유를 하는 경우 에탄올농도 학습이 진행되지 않는 문제점이 있다.In addition, when an error occurs in the fuel level sensor, the conventional ethanol concentration learning logic has to be repeatedly started to perform the ethanol concentration learning, there is a possibility that the learning occurs during the repetition process, the learning is made only during startup. When refueling without stopping the engine, there is a problem that the ethanol concentration learning does not proceed.

또한, 연료레벨센서에 오류가 발생하는 경우, 종래 에탄올농도 학습로직은 에탄올농도 학습을 위해서 공기과잉률 편차에 따른 학습로직을 이용할 수 있으나, 이러한 학습로직은 가솔린 연료 사용 중 에탄올을 주유하는 경우와 같이 에탄올농도의 극단적인 변화가 발생하는 경우에만 수행되기 때문에 실질적으로 이를 이용한 에탄올농도 학습을 기대하기는 어려운 문제를 가진다.In addition, when an error occurs in the fuel level sensor, the conventional ethanol concentration learning logic can use the learning logic according to the deviation of the excess air ratio for the ethanol concentration learning, but such a learning logic is the same as the case of fueling ethanol while using gasoline fuel Likewise, since it is performed only when an extreme change in ethanol concentration occurs, it is difficult to actually expect to learn ethanol concentration using the same.

도 1은 종래 가변연료차량의 연료량 보정장치에 의한 제어특성을 보여주기 위한 그래프로서, 연료레벨센서가 고장난 상태에서 에탄올 'E80' 사용 중 'E100'을 주유한 경우의 동작특성을 보여준다. 도 2는 도 1에 대응하는 차량의 시동성능을 보여주기 위한 그래프이다.FIG. 1 is a graph showing control characteristics by a fuel amount correcting apparatus of a conventional variable fuel vehicle, and shows an operating characteristic when ethanol E80 is used while ethanol E80 is used while a fuel level sensor is broken. FIG. 2 is a graph showing the starting performance of the vehicle corresponding to FIG. 1.

이와 같이, 종래 가변연료차량의 연료량 보정장치는 연료레벨센서에 오류가 있는 경우에 종래 에탄올농도 학습로직의 동작이 적절하게 이루어지지 않아 연료량이 정상적으로 보정되지 않기 때문에 가변연료차량(FFV)의 시동성능과 운전성능이 저하되는 문제를 가진다.As described above, the conventional fuel amount correcting device of the variable fuel vehicle has a start-up performance of the variable fuel vehicle FFV because the fuel level is not properly corrected because the operation of the conventional ethanol concentration learning logic is not performed properly when the fuel level sensor has an error. And deterioration of driving performance.

KR 10-2009-0117131 A, 2009. 11. 12, 도면 1KR 10-2009-0117131 A, November 12, 2009, drawing 1

본 발명의 목적은 연료레벨센서의 오류가 있는 경우에도 에탄올농도 학습로직이 정상적으로 기능하도록 개선하여 적절한 연료량 보상이 이루어질 수 있는 가변연료차량의 연료량 보정장치 및 이의 제어방법을 제공하는 것이다.It is an object of the present invention to provide a fuel amount correcting apparatus and a control method thereof of a variable fuel vehicle that can be appropriately compensated by improving the ethanol concentration learning logic to function normally even when there is an error of the fuel level sensor.

상기 목적을 달성하기 위한 본 발명은 가변연료차량의 연료량 보정장치에 관한 것으로, 본 발명에 따른 가변연료차량의 연료량 보정장치는, 연료탱크의 연료레벨을 검출하는 연료레벨센서; 엔진의 배기가스의 산소농도를 검출하는 산소센서; 및 상기 연료레벨센서에 의해 검출된 연료레벨에 의해 주유 여부를 판단하거나 상기 연료레벨센서의 오류가 있는 것으로 판단된 경우 상기 산소센서에 의해 검출되는 산소농도를 분석하여 주유 여부를 판단하고, 주유가 있는 것으로 판단된 경우 에탄올농도 학습을 수행하며, 상기 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행하는 제어부;를 포함하는 것을 특징으로 한다.The present invention for achieving the above object relates to a fuel amount correction device for a variable fuel vehicle, the fuel amount correction device for a variable fuel vehicle according to the present invention, the fuel level sensor for detecting the fuel level of the fuel tank; An oxygen sensor for detecting an oxygen concentration of exhaust gas of the engine; And judging whether to refuel based on the fuel level detected by the fuel level sensor or analyzing the oxygen concentration detected by the oxygen sensor when it is determined that there is an error of the fuel level sensor. If it is determined that the ethanol concentration learning, the control unit for performing the air-fuel ratio feedback control by correcting the fuel amount based on the learned ethanol concentration; characterized in that it comprises a.

상기 제어부는, 상기 검출된 산소농도의 분석에 의해 희박(Lean)시간주기와 농후(Rich)시간주기를 산출하고, 상기 산출된 희박시간주기와 농후시간주기의 비율 값을 사전에 정해진 임계비율 값과 비교하는 것에 의해 상기 주유 여부를 판단할 수 있다.The control unit calculates a lean time period and a rich time period by analyzing the detected oxygen concentration, and determines a ratio value of the calculated lean time period and the rich time period in a predetermined threshold ratio value. By comparing with, it is possible to determine whether the fueling.

상기 제어부는 차량정보를 모니터링하고, 상기 임계비율 값은 상기 모니터링된 차량정보 중 차량의 RPM 또는 공기량에 의해 조절될 수 있다.The controller may monitor vehicle information, and the threshold ratio value may be adjusted by RPM or air amount of the vehicle among the monitored vehicle information.

상기 제어부는 차량정보를 모니터링하고, 상기 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되는 것으로 파악된 경우, 상기 에탄올농도 학습을 비활성화할 수 있다.The control unit monitors the vehicle information, and when it is determined that the state of the vehicle corresponds to the deceleration section by the monitored vehicle information, it may deactivate the ethanol concentration learning.

한편, 상기 목적을 달성하기 위한 본 발명은 가변연료차량의 연료량 보정장치의 제어방법에 관한 것으로, 본 발명에 따른 가변연료차량의 연료량 보정장치의 제어방법은, 연료레벨센서의 오류 발생여부를 판단하는 단계; 상기 연료레벨센서의 오류가 있는 것으로 판단된 경우, 산소센서에 의해 검출되는 산소농도를 분석하여 희박(Lean)시간주기와 농후(Rich)시간주기를 산출하는 단계; 상기 산출된 희박시간주기와 농후시간주기의 비율 값을 사전에 정해진 임계비율 값과 비교하는 것에 의해 주유 여부를 판단하는 단계; 상기 주유가 있는 것으로 판단된 경우, 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되지 않는 정상상태(steady state) 운전인지 판단하는 단계; 및 상기 정상상태 운전인 것으로 판단된 경우, 에탄올농도 학습을 수행하고 상기 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행하는 단계;를 포함하는 것을 특징으로 한다.On the other hand, the present invention for achieving the above object relates to a control method of the fuel amount correction device of a variable fuel vehicle, the control method of the fuel amount correction device of a variable fuel vehicle according to the present invention, it is determined whether the error of the fuel level sensor Making; Calculating a lean time period and a rich time period by analyzing an oxygen concentration detected by an oxygen sensor when it is determined that there is an error of the fuel level sensor; Determining whether the fuel is lubricated by comparing the calculated ratio between the lean time period and the rich time period with a predetermined threshold ratio value; Determining whether the state of the vehicle is a steady state driving that does not correspond to the deceleration section based on the monitored vehicle information when it is determined that the fuel is present; And performing the ethanol concentration learning and correcting the fuel amount based on the learned ethanol concentration when performing the steady state operation, and performing air-fuel ratio feedback control.

상기 임계비율 값은 상기 모니터링된 차량정보 중 차량의 RPM 또는 공기량에 의해 조절될 수 있다.The threshold ratio value may be adjusted by the RPM or air amount of the vehicle among the monitored vehicle information.

이와 같이 본 발명에 따른 가변연료차량의 연료량 보정장치는 연료레벨센서의 오류가 있는 경우에도 정상적인 에탄올농도 학습을 수행함으로써 적절한 연료량의 보상이 가능하여 가변연료차량의 시동성능 및 운전성능의 저하를 최소화할 수 있다.As described above, the fuel amount correcting device of the variable fuel vehicle according to the present invention can compensate the appropriate fuel amount by performing the normal ethanol concentration learning even when there is an error of the fuel level sensor, thereby minimizing the deterioration of starting performance and operating performance of the variable fuel vehicle. can do.

또한 본 발명에 따른 가변연료차량의 연료량 보정장치는 종래와 달리 에탄올농도 학습을 위해 주유시 시동 오프(OFF)를 할 필요가 없기 때문에 사용자의 편의성을 향상할 수 있다.In addition, the fuel amount correction device of the variable fuel vehicle according to the present invention can improve the user's convenience because it does not need to turn off when the fuel for learning ethanol concentration unlike the conventional.

또한 본 발명에 따른 가변연료차량의 연료량 보정장치는 종래와 달리 에탄올농도 학습을 위한 반복 시동이 불필요하기 때문에 반복 시동에 따른 학습의 오류를 줄일 수 있어, 가변연료차량의 운전성능이 향상될 수 있다.In addition, the fuel amount correction device of the variable fuel vehicle according to the present invention can reduce the learning error according to the repeated start-up, because it is not necessary to repeat the start for the ethanol concentration learning, unlike the prior art, the driving performance of the variable fuel vehicle can be improved. .

도 1은 종래 가변연료차량의 연료량 보정장치에 의한 제어특성을 나태내는 그래프이다.
도 2는 도 1에 대응하는 차량의 시동특성을 나타내는 그래프이다.
도 3은 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 블록도이다.
도 4는 도 1에 대응되는 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 제어특성을 나타내는 그래프이다.
도 5는 도 2에 대응되는 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 시동특성을 나타내는 그래프이다.
도 6은 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 제어절차도이다.1 is a graph showing the control characteristics by the fuel amount correction device of a conventional variable fuel vehicle.
FIG. 2 is a graph showing starting characteristics of the vehicle corresponding to FIG. 1.
3 is a block diagram of a fuel amount correcting apparatus for a variable fuel vehicle according to an exemplary embodiment of the present invention.
4 is a graph illustrating control characteristics of a fuel amount correcting apparatus of a variable fuel vehicle according to an exemplary embodiment of the present invention corresponding to FIG. 1.
FIG. 5 is a graph showing starting characteristics of a fuel amount correcting apparatus of a variable fuel vehicle according to an exemplary embodiment of the present invention corresponding to FIG. 2.
6 is a control flowchart of a fuel amount correcting apparatus for a variable fuel vehicle according to an exemplary embodiment of the present invention.

이하 첨부된 도면들을 참조하여 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치에 대해 설명한다.Hereinafter, a fuel amount correcting apparatus for a variable fuel vehicle according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

도 3은 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치에 대한 블록도이다. 도 3에 도시된 바와 같이, 본 실시예에 따른 가변연료차량의 연료량 보정장치(100)는 연료레벨센서(110), 산소센서(120) 및 제어부(130)로 이루어질 수 있다.3 is a block diagram of a fuel amount correcting apparatus for a variable fuel vehicle according to an exemplary embodiment of the present invention. As shown in FIG. 3, the fuel amount correcting apparatus 100 of the variable fuel vehicle according to the present exemplary embodiment may include a fuel level sensor 110, an oxygen sensor 120, and a controller 130.

연료레벨센서(110)는 연료탱크내의 연료레벨을 센싱하여 제어부(130)로 전달한다. 연료레벨센서(110)에 의해 센싱된 연료레벨에 의해 주유 여부가 파악될 수 있다.The fuel level sensor 110 senses the fuel level in the fuel tank and transmits it to the controller 130. Whether fueling may be determined by the fuel level sensed by the fuel level sensor 110.

산소센서(120)는 엔진(140)으로부터 배출된 배기가스에 포함된 산소농도를 검출한다. 일반적으로 산소센서(120)는 희박(Lean) 또는 농후(Rich)대한 정보를 제어부(130)로 제공하며, 연료량 피드백 제어를 위해 활용된다..The oxygen sensor 120 detects the oxygen concentration contained in the exhaust gas discharged from the engine 140. In general, the oxygen sensor 120 provides information about lean or rich to the controller 130 and is used for fuel amount feedback control.

제어부(130)는 도 3에 도시된 바와 같이 주유여부 판단모듈(132), 에탄올농도 학습모듈(134) 및 공연비 피드백제어모듈(136)로 이루어질 수 있다.As shown in FIG. 3, the controller 130 may include a fueling determination module 132, an ethanol concentration learning module 134, and an air-fuel ratio feedback control module 136.

주유여부 판단모듈(132)은 연료레벨센서(110)에 의해 검출된 연료레벨에 의해 주유 여부를 판단하거나, 연료레벨센서(110)의 오류가 있는 것으로 판단된 경우 산소센서(120)에 의해 검출되는 산소농도를 분석하여 주유 여부를 판단할 수 있다.The fuel supply determination module 132 determines whether fueling is performed based on the fuel level detected by the fuel level sensor 110, or when the fuel level sensor 110 determines that there is an error of the fuel level sensor 110. By analyzing the oxygen concentration can be determined whether or not fueling.

즉, 주유여부 판단모듈(132)은 검출된 산소농도의 분석에 의해 희박(Lean)시간주기와 농후(Rich)시간주기를 산출하고, 이 산출된 희박시간주기와 농후시간주기의 비율을 사전에 정해진 임계비율 값과 비교하는 것에 의해 주유 여부를 판단할 수 있다.That is, the refueling determination module 132 calculates a lean time period and a rich time period by analyzing the detected oxygen concentration, and calculates a ratio of the calculated lean time period and the rich time period in advance. By comparing with a predetermined threshold ratio value, it is possible to determine whether to refuel.

예를 들어 도 4를 참조하면, 제어부(130)는 "농후(Rich)시간주기 ÷ 희박(Lean)시간주기"의 비율 값이 사전에 정해진 임계비율 값 보다 큰 경우, 주유가 있는 것으로 판단하여 에탄올농도 학습모듈(134)을 수행할 수 있다.For example, referring to FIG. 4, when the ratio value of the "rich time period ÷ lean time period" is greater than a predetermined threshold ratio value, the controller 130 determines that there is lubrication. The concentration learning module 134 may be performed.

에탄올농도 학습모듈(134)은 주유여부 판단모듈(132)에 의해 주유가 있는 것으로 판단된 경우 에탄올농도 학습을 수행할 수 있다.The ethanol concentration learning module 134 may perform ethanol concentration learning when it is determined that there is oiling by the fueling determination module 132.

또한 에탄올농도 학습모듈(134)은 외부로부터 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되는 것으로 파악된 경우 비활성화될 수 있다. 이것은 감속구간에서는 연료량의 분사가 불규칙적으로 증감되기 때문에 에탄올농도 학습이 적절하게 이루어지기 어렵기 때문이다.In addition, the ethanol concentration learning module 134 may be deactivated when it is determined that the state of the vehicle corresponds to the deceleration section by the vehicle information monitored from the outside. This is because ethanol concentration learning is difficult to properly perform because the injection of fuel amount is increased or decreased irregularly in the deceleration section.

공연비 피드백제어모듈(136)은 에탄올농도 학습모듈(134)에 의해 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행할 수 있다.The air-fuel ratio feedback control module 136 may perform the air-fuel ratio feedback control by correcting the amount of fuel based on the ethanol concentration learned by the ethanol concentration learning module 134.

이와 같이 본 실시예에 따른 가변연료차량의 연료량 보정장치(100)는 연료레벨센서(110)의 오류가 있는 경우에도, 도 4 및 도 5에 나타난 바와 같이 정상적인 에탄올농도 학습이 가능함으로써 적절한 연료량의 보상이 가능하여 가변연료차량의 시동성능 및 운전성능의 저하를 최소화할 수 있다.As described above, even when there is an error of the fuel level sensor 110, the fuel amount correcting apparatus 100 of the variable fuel vehicle according to the present exemplary embodiment can learn the normal ethanol concentration as shown in FIGS. Compensation can be made to minimize the deterioration of starting performance and operation performance of the variable fuel vehicle.

여기서, 도 4는 도 1에 대응되는 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 제어특성을 나타내는 그래프이고, 도 5는 도 2에 대응되는 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치의 시동특성을 나타내는 그래프이다.4 is a graph illustrating control characteristics of a fuel amount correcting apparatus of a variable fuel vehicle according to an embodiment of the present invention corresponding to FIG. 1, and FIG. 5 is a variable according to an embodiment of the present invention corresponding to FIG. 2. It is a graph which shows the starting characteristic of the fuel amount correction apparatus of a fuel vehicle.

이하에서는, 도 6을 참조하여 본 발명의 일 실시예에 따른 가변연료차량의 연료량 보정장치(100)의 동작을 설명한다. 여기서는 제어부(130)를 중심으로 설명한다.Hereinafter, an operation of the fuel amount correcting apparatus 100 of the variable fuel vehicle according to the exemplary embodiment of the present invention will be described with reference to FIG. 6. Here, the control unit 130 will be described.

먼저 제어부(130)는 연료레벨센서(110)의 오류 발생여부를 판단하고(S610), 오류가 발생되지 않은 것으로 판단된 경우 연료레벨센서(110)에 의해 검출된 연료레벨에 의해 주유 여부를 판단하며(S615), 판단결과 주유가 있는 것으로 판단된 경우 후술하는 S650단계에 따른 에탄올농도 학습을 수행한다.First, the controller 130 determines whether an error occurs in the fuel level sensor 110 (S610), and when it is determined that no error occurs, the controller 130 determines whether fueling is performed based on the fuel level detected by the fuel level sensor 110. And (S615), if it is determined that there is the fueling, the ethanol concentration learning according to the step S650 will be described later.

한편, S610단계의 판단 결과, 연료레벨센서(110)의 오류가 있는 것으로 판단된 경우, 제어부(130)는 산소센서(120)에 의해 검출되는 산소농도를 분석하여 희박(Lean)시간주기와 농후(Rich)시간주기를 산출한다(S620).On the other hand, when it is determined in step S610 that the fuel level sensor 110 has an error, the controller 130 analyzes the oxygen concentration detected by the oxygen sensor 120 to detect a lean time period and richness. (Rich) A time period is calculated (S620).

다음, 제어부(130)는 산출된 희박시간주기와 농후시간주기의 비율 값을 사전에 정해진 임계비율 값과 비교하는 것에 의해 주유 여부를 판단한다(S630).Next, the controller 130 determines whether the fuel is lubricated by comparing the calculated ratio values of the lean time period and the rich time period with a predetermined threshold ratio value (S630).

S630단계의 판단 결과 주유가 있는 것으로 판단된 경우, 제어부(130)는 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되지 않는 정상상태(steady state) 운전인지 판단하고(S640), 판단 결과 정상상태 운전이 아닌 것으로 판단된 경우 S620단계를 수행한다.If it is determined in step S630 that there is oiling, the controller 130 determines whether the state of the vehicle is a steady state driving that does not correspond to the deceleration section based on the monitored vehicle information (S640). If it is determined that the operation is not in the normal state, step S620 is performed.

S640단계의 판단 결과 정상상태 운전인 것으로 판단된 경우, 제어부(130)는 에탄올농도 학습을 수행한다(S650). 이와 같이 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행할 수 있다.If it is determined that the operation is in the steady state in step S640, the controller 130 performs ethanol concentration learning (S650). The air-fuel ratio feedback control can be performed by correcting the fuel amount based on the learned ethanol concentration.

이와 같이 본 실시예에 따른 가변연료차량의 연료량 보정장치(100)는 연료레벨센서(110)의 오류가 있는 경우에도 정상적인 에탄올농도 학습을 수행함으로써 적절한 연료량의 보상이 가능하여 가변연료차량의 시동성능 및 운전성능의 저하를 최소화할 수 있다.As such, the fuel amount correcting apparatus 100 of the variable fuel vehicle according to the present exemplary embodiment can compensate the appropriate fuel amount by performing normal ethanol concentration learning even when the fuel level sensor 110 has an error, so that the starting performance of the variable fuel vehicle can be compensated. And it is possible to minimize the deterioration of the driving performance.

또한 본 실시예에 따른 가변연료차량의 연료량 보정장치(100)는 종래와 달리 에탄올농도 학습을 위해 주유시 시동 오프(OFF)를 할 필요가 없기 때문에 사용자의 편의성을 향상할 수 있다.In addition, the fuel amount correction device 100 of the variable fuel vehicle according to the present embodiment can improve the user's convenience because it does not need to be turned off when refueling for ethanol concentration learning, unlike the prior art.

또한 본 발명에 따른 가변연료차량의 연료량 보정장치(100)는 종래와 달리 에탄올농도 학습을 위한 반복 시동이 불필요하기 때문에 반복 시동에 따른 학습의 오류를 줄일 수 있어, 가변연료차량의 운전성능이 향상될 수 있다.In addition, the fuel amount correcting apparatus 100 of the variable fuel vehicle according to the present invention can reduce the learning error according to the repeated start-up, because it is unnecessary to repeat the start for ethanol concentration learning, unlike the prior art, the operation performance of the variable fuel vehicle is improved Can be.

100: 가변연료차량의 연료량 보정장치
110: 연료레벨센서
120: 산소센서
130: 제어부
132: 주유여부 판단모듈
134: 에탄올농도 학습모듈
136: 공연비 피드백제어모듈
140: 엔진100: fuel amount correction device of the variable fuel vehicle
110: fuel level sensor
120: oxygen sensor
130:
132: determination of fueling
134: Ethanol Concentration Learning Module
136: air-fuel ratio feedback control module
140: engine

Claims (6)

연료탱크의 연료레벨을 검출하는 연료레벨센서;
엔진의 배기가스의 산소농도를 검출하는 산소센서; 및
상기 연료레벨센서에 의해 검출된 연료레벨에 의해 주유 여부를 판단하거나 상기 연료레벨센서의 오류가 있는 것으로 판단된 경우 상기 산소센서에 의해 검출되는 산소농도를 분석하여 주유 여부를 판단하고, 주유가 있는 것으로 판단된 경우 에탄올농도 학습을 수행하며, 상기 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행하는 제어부;를
포함하는 것을 특징으로 하는 가변연료차량의 연료량 보정장치.A fuel level sensor detecting a fuel level of the fuel tank;
An oxygen sensor for detecting an oxygen concentration of exhaust gas of the engine; And
The fuel level detected by the fuel level sensor is used to determine whether to refuel or when the fuel level sensor is determined to have an error by analyzing the oxygen concentration detected by the oxygen sensor to determine whether to refuel. If it is determined that the ethanol concentration learning, the control unit for performing the air-fuel ratio feedback control by correcting the fuel amount based on the learned ethanol concentration;
Fuel amount correction device for a variable fuel vehicle comprising a. 제1항에 있어서,
상기 제어부는, 상기 검출된 산소농도의 분석에 의해 희박(Lean)시간주기와 농후(Rich)시간주기를 산출하고, 상기 산출된 희박시간주기와 농후시간주기의 비율 값을 사전에 정해진 임계비율 값과 비교하는 것에 의해 상기 주유 여부를 판단하는 것을 특징으로 하는 가변연료차량의 연료량 보정장치.The method of claim 1,
The control unit calculates a lean time period and a rich time period by analyzing the detected oxygen concentration, and determines a ratio value of the calculated lean time period and the rich time period in a predetermined threshold ratio value. The fuel amount correction device of a variable fuel vehicle, characterized in that for determining the refueling by comparing with. 제2항에 있어서,
상기 제어부는 차량정보를 모니터링하고, 상기 임계비율 값은 상기 모니터링된 차량정보 중 차량의 RPM 또는 공기량에 의해 조절되는 것을 특징으로 하는 가변연료차량의 연료량 보정장치.The method of claim 2,
The control unit monitors the vehicle information, and the threshold ratio value is the fuel amount correction device of the variable fuel vehicle, characterized in that adjusted by the RPM or the air volume of the vehicle of the monitored vehicle information. 제1항에 있어서,
상기 제어부는 차량정보를 모니터링하고, 상기 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되는 것으로 파악된 경우, 상기 에탄올농도 학습을 비활성화 하는 것을 특징으로 하는 가변연료차량의 연료량 보정장치.The method of claim 1,
The control unit monitors the vehicle information, and if it is determined that the state of the vehicle corresponds to the deceleration section by the monitored vehicle information, the fuel amount correction device for a variable fuel vehicle, characterized in that for deactivating the ethanol concentration learning. 가변연료차량의 연료량 보정장치의 제어방법에 있어서,
연료레벨센서의 오류 발생여부를 판단하는 단계;
상기 연료레벨센서의 오류가 있는 것으로 판단된 경우, 산소센서에 의해 검출되는 산소농도를 분석하여 희박(Lean)시간주기와 농후(Rich)시간주기를 산출하는 단계;
상기 산출된 희박시간주기와 농후시간주기의 비율 값을 사전에 정해진 임계비율 값과 비교하는 것에 의해 주유 여부를 판단하는 단계;
상기 주유가 있는 것으로 판단된 경우, 모니터링된 차량정보에 의해 차량의 상태가 감속구간에 해당되지 않는 정상상태(steady state) 운전인지 판단하는 단계; 및
상기 정상상태 운전인 것으로 판단된 경우, 에탄올농도 학습을 수행하고 상기 학습된 에탄올농도를 기초로 연료량을 보정하여 공연비 피드백제어를 수행하는 단계;를
포함하는 것을 특징으로 하는 가변연료차량의 연료량 보정장치의 제어방법.In the control method of the fuel amount correction device of a variable fuel vehicle,
Determining whether an error occurs in the fuel level sensor;
Calculating a lean time period and a rich time period by analyzing an oxygen concentration detected by an oxygen sensor when it is determined that there is an error of the fuel level sensor;
Determining whether the fuel is lubricated by comparing the calculated ratio between the lean time period and the rich time period with a predetermined threshold ratio value;
Determining whether the state of the vehicle is a steady state driving that does not correspond to the deceleration section based on the monitored vehicle information when it is determined that the fuel is present; And
Performing the ethanol concentration learning and correcting the fuel amount based on the learned ethanol concentration when performing the steady state operation, and performing air-fuel ratio feedback control;
Control method of the fuel amount correction device for a variable fuel vehicle comprising a. 제5항에 있어서,
상기 임계비율 값은 상기 모니터링된 차량정보 중 차량의 RPM 또는 공기량에 의해 조절되는 것을 특징으로 하는 가변연료차량의 연료량 보정장치의 제어방법.The method of claim 5,
The threshold ratio value is a control method of a fuel amount correcting device of a variable fuel vehicle, characterized in that adjusted by the amount of RPM or air volume of the vehicle of the monitored vehicle information.
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