KR100569057B1 - Method for controlling fuel of lpg vehicles - Google Patents

Method for controlling fuel of lpg vehicles Download PDF

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KR100569057B1
KR100569057B1 KR1020020084192A KR20020084192A KR100569057B1 KR 100569057 B1 KR100569057 B1 KR 100569057B1 KR 1020020084192 A KR1020020084192 A KR 1020020084192A KR 20020084192 A KR20020084192 A KR 20020084192A KR 100569057 B1 KR100569057 B1 KR 100569057B1
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air
fuel
fuel ratio
amount
ratio control
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KR1020020084192A
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Korean (ko)
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KR20040057445A (en
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장정모
권영수
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현대자동차주식회사
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454Introducing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling 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
    • F02D19/0639Controlling 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
    • F02D19/0642Controlling 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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647Controlling 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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/24Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425Particular ways of programming the data
    • F02D41/2429Methods of calibrating or learning
    • F02D41/2451Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2454Learning of the air-fuel ratio control
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/30Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

베이퍼라이저의 연료를 차량의 운전 조건에 맞추어 최적의 상태로 공급할 수 있도록 함과 동시에, 고속에서 아이들링 상태로 타행 주행시의 왜곡된 연료량 학습치에 의한 공연비 보상량이 신규 운전영역에 적용되는 현상을 개선하여 피드백 제어할 수 있도록;Improves the phenomenon that the air fuel ratio compensation amount is applied to the new driving range by the distorted fuel quantity learning value at the high speed and idling state while driving the fuel in the optimum condition according to the driving conditions of the vehicle. To control;

적용조건 하에서, 공연비 제어를 이루는 제1단계; 상기 공연비 제어량이 설정범위내에 있는가는 판단하고, 설정범위 내에 있으면, 연료량 제어시의 공연비 보상 인자로 적용되는 제2단계; 상기 제2단계에서, 공연비 제어량이 설정범위를 벗어나면, 주행중 연료량 학습영역이 천이(변경)되는가는 판단하여, 천이되지 않으면, 상기 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제3단계; 상기 제3단계에서, 주행중 연료량 학습영역이 천이(변경)된 것으로 판단되면, 상기 공연비 제어량을 캘리브레이션 상수로 리셋하여 설정시간 동안 유지하는 제4단계; 상기 제4단계에 이어, 설정시간이 경과되면, 산소센서의 신호를 입력받아 공연비 제어를 재개하여 그 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제5단계; 상기 제2단계, 제3단계, 및 제5단계에서 각각 설정되는 공연비 제어량을 공연비 보상 인자로 하여 연료량을 제어하는 제6단계를 포함하는 액화석유가스 차량용 연료 제어방법을 제공한다.A first step of achieving air-fuel ratio control under application conditions; Judging whether the air-fuel ratio control amount is within a setting range, and if it is within the setting range, applying the air-fuel ratio control factor at the time of fuel amount control; In the second step, if the air-fuel ratio control amount is out of the setting range, it is determined whether the fuel amount learning region transitions (changes) during driving; and if it is not transitioned, the third step of applying the air-fuel ratio control amount as an air-fuel ratio compensation factor in controlling the fuel amount ; In the third step, if it is determined that the fuel amount learning region has shifted (changed) during driving, resetting the air-fuel ratio control amount to a calibration constant and maintaining it for a set time; Following the fourth step, when the set time has elapsed, a fifth step in which the air-fuel ratio control is resumed by receiving a signal from the oxygen sensor and the air-fuel ratio control amount is applied as an air-fuel ratio compensation factor in controlling the fuel amount; It provides a fuel control method for a liquefied petroleum gas vehicle comprising a sixth step of controlling the fuel amount by using the air-fuel ratio control amount set in the second, third, and fifth step as the air-fuel ratio compensation factor.

액화석유가스, LPG, 연료 제어, 공연비 제어Liquefied petroleum gas, LPG, fuel control, air-fuel ratio control

Description

액화석유가스 차량용 연료 제어방법{METHOD FOR CONTROLLING FUEL OF LPG VEHICLES}Fuel control method for liquefied petroleum gas vehicles {METHOD FOR CONTROLLING FUEL OF LPG VEHICLES}

도 1은 본 발명이 적용되는 액화석유가스 차량용 연료 공급 시스템의 구성도이다.1 is a block diagram of a fuel supply system for a liquefied petroleum gas vehicle to which the present invention is applied.

도 2는 종래 액화석유가스 차량용 연료 제어방법에 따른 타행 주행시의 왜곡된 연료량 학습치에 의한 공연비 보상량을 설명하기 위한 신호 선도이다,FIG. 2 is a signal diagram for explaining an air-fuel ratio compensation amount by a distorted fuel amount learning value when traveling in accordance with a conventional fuel control method for a liquefied petroleum gas vehicle.

도 3은 본 발명의 실시예에 따른 액화석유가스 차량용 연료 제어방법의 흐름도이다.3 is a flowchart of a fuel control method for a liquefied petroleum gas vehicle according to an exemplary embodiment of the present invention.

도 4는 본 발명의 액화석유가스 차량용 연료 제어방법에 따른 연료량 제어 신호선도이다. 4 is a fuel amount control signal line according to the fuel control method for a liquefied petroleum gas vehicle of the present invention.

본 발명은 액화석유가스 차량용 연료 제어방법에 관한 것으로, 더욱 상세하게는 베이퍼라이저의 연료를 차량의 운전 조건에 맞추어 최적의 상태로 공급할 수 있도록 함과 동시에, 고속에서 아이들링 상태로 타행 주행시의 왜곡된 연료량 학습치에 의한 공연비 보상량이 신규 운전영역에 적용되는 현상을 개선하여 피드백 제 어할 수 있도록 함으로써, 엔진 스톨(stall)을 방지하고, 배기가스를 저감할 수 있도록 하는 액화석유가스 차량용 연료 제어방법에 관한 것이다.The present invention relates to a fuel control method for a liquefied petroleum gas vehicle, and more particularly, it is possible to supply the fuel of the vaporizer in an optimal state in accordance with the driving conditions of the vehicle, and at the same time, the amount of distorted fuel when traveling in high speed at idling. The present invention relates to a fuel control method for a liquefied petroleum gas vehicle which can prevent feedback of an engine stall and reduce exhaust gas by improving feedback of the air-fuel ratio based on a learning value to be applied to a new driving range. will be.

예컨대, 액화석유가스(LPG; 이하 LP가스라 함)나 압축천연가스(LNG) 등을 연료로 이용하는 차량은 가솔린이나 디젤을 이용하는 차량에 비하여 비교적 유해가스의 배출량이 적으며, 연료 소비 비용이 저렴하기 때문에 최근 이와 같은 가스 연료의 사용이 널리 확대되고 있다. For example, vehicles using liquefied petroleum gas (LPG) or compressed natural gas (LNG) as fuels have relatively lower emissions of harmful gases and lower fuel consumption costs than vehicles using gasoline or diesel. In recent years, the use of such a gas fuel has been widely expanded.

그런데, 이와 같은 가스 연료를 사용하기 위해서는 일반적인 연료 공급 구조 외에 별도의 가스 공급 장치와 함께, 연료 제어가 이루어져야 하는데, 이 중 LP가스를 연료로 이용하는 액화석유가스 차량의 연료 공급 계통을 도 1을 참고로 하여 살펴보면, LP가스는 봄베(Bombe; 12)에 충전된 상태로 보관되며, 이 봄베(12)로부터 액상 라인 또는 기상 라인을 통해 약 4㎏/㎠정도의 고압 가스가 베이퍼라이저 (Vaporizer; 14)의 제1감압실(16)로 들어가며, 이 베이퍼라이저(14)의 제1감압실(16)에서 0.3㎏/㎠정도로 1차 감압된 후에 스타트 어져스트 스크류(Start adjust screw; 18)와 스타트 솔레노이드 밸브(Start solenoid V.; 20)를 통해 베이퍼라이저(14)의 제2감압실(22)로 들어가서 대기압까지 최종 감압된 후에, 퓨얼 컷 솔레노이드 밸브(Fuel cut solenoid V.; 24)를 통해 나와서 듀티 솔레노이드 밸브(Duty solenoid V.; 26)측과 메인 어져스트 스크류(Main adjust screw ; 28)측으로 분지되고, 믹서(30)로 연료가 공급되면서 공기와 혼합된다. However, in order to use such a gas fuel, fuel control must be performed together with a separate gas supply device in addition to the general fuel supply structure, and among these, a fuel supply system of a liquefied petroleum gas vehicle using LP gas as a fuel is shown in FIG. 1. As shown, LP gas is stored in a bombe (Bombe; 12) filled state, the high-pressure gas of about 4 kg / ㎠ about the liquid line or gaseous line from the cylinder 12 (Vaporizer; 14) To the first pressure reducing chamber (16) of the vaporizer (14), the first pressure reducing chamber (16) to the first pressure reducing to about 0.3 kg / cm2 after the start adjust screw (Start adjust screw; 18) and the start solenoid valve Through the sole soleidid V. 20 into the second pressure reducing chamber 22 of the vaporizer 14 and finally depressurized to atmospheric pressure, then through the fuel cut solenoid V. 24 to the duty solenoid. DE valve (Duty solenoid V .; 26) side and the main adjuster screw host; is branched toward the (Main adjust screw 28), while fuel is supplied to the mixer 30 and is mixed with air.

여기서, 공기량은 통상 주행시에는 믹서(30)내의 스로틀 밸브(32)를 통하여 조절되며, 아이들링 상태나 시동시에는 공기를 스로틀 밸브(32)를 거치지 않고 바 이패스시키는 에어 어져스트 스크류(34)와 공기량을 펄스폭 변조(PWM) 제어하는 ISCA(Idle speed control actuator) 밸브(36)를 설치하여 공기량을 피드백 제어할 수 있도록 한다.Here, the air amount is regulated through the throttle valve 32 in the mixer 30 during normal driving, and the air adjust screw 34 and the air amount for bypassing the air without passing through the throttle valve 32 during idling or starting up. Idle speed control actuator (ISCA) valve 36 for controlling the pulse width modulation (PWM) is installed to enable feedback control of the amount of air.

상기와 같이 이루어지는 액화석유가스 차량의 연료 공급 시스템의 연료 제어는 ECU에서 공연비 제어를 통한 공연비 보상 + 학습 보상 + 기본 연료량 + 냉각수온보상 + 가감속보상 등을 인자로 하여 연료량을 산출하며, 상기 공연비 보상 및 학습 보상은 폐루프(Closed loop)에서 더하기 보상 조건(term)으로 계산된다. The fuel control of the fuel supply system of the liquefied petroleum gas vehicle as described above calculates the fuel amount based on the air-fuel ratio compensation + learning compensation + basic fuel amount + cooling water temperature compensation + acceleration / deceleration compensation through the air-fuel ratio control in the ECU. Rewards and learning rewards are calculated as a closed compensation term in a closed loop.

그런데, 고속으로 주행중에 운전자가 액셀 페달을 놓고 아이들 상태로 타행 주행을 유지하는 경우에는, 주행풍의 영향으로 인하여 믹서의 벤튜리부에 대기압 보다 큰 압력이 걸림에 따라 연료가 제대로 믹서내로 공급되지 못하여 공연비 희박 현상이 발생하게 된다. However, when the driver releases the accelerator pedal and keeps running while idle at high speed, fuel may not be properly supplied into the mixer due to the influence of the driving wind, resulting in a pressure greater than atmospheric pressure. A lean phenomenon will occur.

즉, 고속주행이고 스로틀 밸브가 닫힌 상태의 주행(이하, 타행 주행)에서는 벤츄리 부위에 대기압 수준의 압력을 형성하게 되며, 타행 주행중 차속과 공연비 희박은 비례관계에 있다고 할 수 있다. That is, when driving at high speed and driving with the throttle valve closed (hereinafter referred to as another driving), an atmospheric pressure level is formed at the venturi portion, and the vehicle speed and the air-fuel ratio lean in the other driving are proportional to each other.

따라서 상기와 같이 타행 주행에서 운전할 경우, ECU는 연료부족으로 판단하여 연료량 학습을 최대치(+50%)에 가깝게 학습하게 된다. Therefore, when driving in the other road as described above, the ECU determines that the fuel shortage is close to the maximum (+ 50%) to learn the fuel.

그러나, 도 2에서와 같이, 고속 타행에서의 연료량 학습이 과다(25%)했을 때, 과다한 연료량 학습치가 정지 직전의 저속 타행에서도 적용되면 공연비 제어(λ-control)는 연료를 감량하는 방향으로 급속히 진행하게 되며,(연료량 학습치;too much) 이 때, 운전(학습)영역 천이시 과다하게 감량된 공연비 제어량이 적용되어 공연비는 희박하게 되어 엔진 스톨(stall) 까지도 발생할 우려있다. (공연비 제어치; too little)However, as shown in Fig. 2, when the fuel amount learning in the high speed line is excessive (25%), if the excessive fuel amount learning value is applied in the low speed line just before the stop, the air-fuel ratio control (λ-control) rapidly decreases in the direction of reducing fuel. At this time, an excessively reduced air-fuel ratio control amount is applied at the time of transition of the driving (learning) region, and thus the air-fuel ratio becomes thin and there is a fear that an engine stall may occur. (Fuel ratio control value; too little)

그리고 공연비가 희박(20.0 수준)한 구간에서는 배기가스(NOx) 배출량이 과다하게 되는 문제점도 있다. In addition, there is a problem in that the exhaust gas (NOx) emissions are excessive in the section where the air-fuel ratio is lean (20.0 level).

따라서 본 발명은 상기의 문제점을 해결하기 위한 것으로, 본 발명의 목적은 베이퍼라이저의 연료를 차량의 운전 조건에 맞추어 최적의 상태로 공급할 수 있도록 함과 동시에, 고속에서 아이들링 상태로 타행 주행시의 왜곡된 연료량 학습치에 의한 공연비 보상량이 신규 운전영역에 적용되는 현상을 개선하여 피드백 제어할 수 있도록 함으로써, 엔진 스톨(stall)을 방지하고, 배기가스를 저감할 수 있도록 하는 액화석유가스 차량용 연료 제어방법을 제공하는 것이다. Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to supply fuel of a vaporizer in an optimal state in accordance with driving conditions of a vehicle, and at the same time, distort the amount of fuel when traveling in high speed at idling. The present invention provides a fuel control method for a liquefied petroleum gas vehicle that prevents engine stall and reduces exhaust gas by improving feedback of the air-fuel ratio based on the learning value to be applied to a new driving region. It is.

상기의 목적을 달성하기 위한 본 발명에 따른 액화석유가스 차량용 연료 제어방법은, 적용조건 하에서, 공연비 제어를 이루는 제1단계; 상기 공연비 제어량이 설정범위내에 있는가는 판단하고, 설정범위 내에 있으면, 연료량 제어시의 공연비 보상 인자로 적용되는 제2단계; 상기 제2단계에서, 공연비 제어량이 설정범위를 벗어나면, 주행중 연료량 학습영역이 천이(변경)되는가는 판단하여, 천이되지 않으면, 상기 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제3단계; 상기 제3단계에서, 주행중 연료량 학습영역이 천이(변경)된 것으로 판단되면, 상기 공연비 제어량을 캘리브레이션 상수로 리셋하여 설정시간 동안 유지하는 제4단계; 상기 제4단계에 이어, 설정시간이 경과되면, 산소센서의 신호를 입력받아 공연비 제어를 재개하여 그 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제5단계; 상기 제2단계, 제3단계, 및 제5단계에서 각각 설정되는 공연비 제어량을 공연비 보상 인자로 하여 연료량을 제어하는 제6단계를 포함한다. Fuel control method for a liquefied petroleum gas vehicle according to the present invention for achieving the above object, a first step of achieving the air-fuel ratio control under the application conditions; Judging whether the air-fuel ratio control amount is within a setting range, and if it is within the setting range, applying the air-fuel ratio control factor at the time of fuel amount control; In the second step, if the air-fuel ratio control amount is out of the setting range, it is determined whether the fuel amount learning region transitions (changes) during driving; and if it is not transitioned, the third step of applying the air-fuel ratio control amount as an air-fuel ratio compensation factor in controlling the fuel amount ; In the third step, if it is determined that the fuel amount learning region has shifted (changed) during driving, resetting the air-fuel ratio control amount to a calibration constant and maintaining it for a set time; Following the fourth step, when the set time has elapsed, a fifth step in which the air-fuel ratio control is resumed by receiving a signal from the oxygen sensor and the air-fuel ratio control amount is applied as an air-fuel ratio compensation factor in controlling the fuel amount; And a sixth step of controlling the fuel amount using the air-fuel ratio control amounts set in the second, third, and fifth steps as air-fuel ratio compensation factors, respectively.

이하, 상기의 목적을 구체적으로 실현할 수 있는 본 발명의 실시예를 첨부된 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings an embodiment of the present invention that can specifically realize the above object will be described.

도 1을 참조하면, 본 발명이 적용되는 액화석유가스 차량용 연료 공급 시스템의 바람직한 실시예가 도시된다.1, a preferred embodiment of a fuel supply system for a liquefied petroleum gas vehicle to which the present invention is applied is shown.

먼저, 본 발명이 적용되는 액화석유가스 차량용 연료 공급 시스템의 구성은, LP가스가 봄베(Bombe; 12)에 충전된 상태로 보관되며, 이 봄베(12)로부터 액상 라인 또는 기상 라인을 통해 약 4㎏/㎠정도의 고압 가스가 베이퍼라이저 (Vaporizer; 14)의 제1감압실(16)로 들어가며, 이 베이퍼라이저(14)의 제1감압실(16)에서 0.3㎏/㎠정도로 1차 감압된 후에 스타트 어져스트 스크류(Start adjust screw; 18)와 스타트 솔레노이드 밸브(Start solenoid V.; 20)를 통해 베이퍼라이저(14)의 제2감압실(22)로 들어가서 대기압까지 최종 감압된 후에, 퓨얼 컷 솔레노이드 밸브(Fuel cut solenoid V.; 24)를 통해 나와서 듀티 솔레노이드 밸브(Duty solenoid V.; 26)측과 메인 어져스트 스크류(Main adjust screw ; 28)측으로 분지되고, 믹서(30)로 연료가 공급되면서 공기와 혼합된다. First, the configuration of the fuel supply system for a liquefied petroleum gas vehicle to which the present invention is applied is stored in a state in which LP gas is charged in a bomb 12, and is about 4 from the cylinder 12 through a liquid line or a gaseous line. The high pressure gas of about kg / cm 2 enters the first pressure reducing chamber 16 of the vaporizer 14, and the pressure is reduced to about 0.3 kg / cm 2 in the first pressure reducing chamber 16 of the vaporizer 14 before starting. After entering the second pressure reducing chamber 22 of the vaporizer 14 through the start adjust screw 18 and the start solenoid valve 20 and finally reducing the pressure to atmospheric pressure, the fuel cut solenoid valve It comes out through the fuel cut solenoid V .; 24) and branches to the duty solenoid V. 26 and the main adjust screw 28, and the fuel is supplied to the mixer 30, Are mixed.

여기서, 공기량은 통상 주행시에는 믹서(30)내의 스로틀 밸브(32)를 통하여 조절되며, 아이들링 상태나 시동시에는 공기를 스로틀 밸브(32)를 거치지 않고 바 이패스시키는 에어 어져스트 스크류(34)와 공기량을 펄스폭 변조(PWM) 제어하는 ISCA(Idle speed control actuator) 밸브(36)를 설치하여 공기량을 피드백 제어할 수 있도록 한다.Here, the air amount is regulated through the throttle valve 32 in the mixer 30 during normal driving, and the air adjust screw 34 and the air amount for bypassing the air without passing through the throttle valve 32 during idling or starting up. Idle speed control actuator (ISCA) valve 36 for controlling the pulse width modulation (PWM) is installed to enable feedback control of the amount of air.

상기와 같이 이루어지는 연료 공급 시스템에 적용되는 연료 제어 방법은 도 3에서 도시한 바와 같이, 먼저, 적용조건 하에서, ECU에서 공연비 제어를 이루게 된다.(S10) In the fuel control method applied to the fuel supply system made as described above, as shown in FIG. 3, first, the air-fuel ratio control is performed in the ECU under the application conditions (S10).

이 때, 상기 적용조건은 시동 후, 설정시간이 경과한 상태이며, 냉각수온이 설정온도 이상인 상태를 조건으로 한다. At this time, the application condition is a condition that the set time has elapsed after the start, and the condition that the coolant temperature is equal to or higher than the set temperature.

이어서, 상기 공연비 제어량이 설정범위내에 있는가는 판단하는데(S20), 만약, 상기 공연비 제어량이 설정범위 내에 있으면, 상기 공연비 제어량은 연료량 제어시(S60)의 공연비 보상 인자로 적용한다. Subsequently, it is determined whether the air-fuel ratio control amount is within a setting range (S20). If the air-fuel ratio control amount is within a setting range, the air-fuel ratio control amount is applied as an air-fuel ratio compensation factor at the time of fuel amount control (S60).

상기 단계(S20)에서, 도 4에서와 같이, 상기 공연비 제어량이 설정범위를 벗어나면, 주행중 연료량 학습영역이 천이(변경)되는가는 판단하게 되는데(S30), 상기 주행중 연료량 학습영역이 천이되지 않으면, 상기 공연비 제어량이 연료량 제어시(S60)의 공연비 보상 인자로 적용된다. In step S20, as shown in FIG. 4, when the air-fuel ratio control amount is out of a setting range, it is determined whether the fuel amount learning region transitions (changes) while driving (S30). The air-fuel ratio control amount is applied as an air-fuel ratio compensation factor in controlling the fuel amount (S60).

상기한 단계(S30)에서, 주행중 연료량 학습영역이 천이(변경)된 것으로 판단되면, 상기 공연비 제어량을 캘리브레이션 상수(a)로 리셋하여 설정시간(t) 동안 유지하게 되는데(S40), 여기서, 상기 캘리브레이션 상수(a)는 '0'으로 한다. In the step S30, when it is determined that the fuel amount learning region during the driving transitions (changes), the air-fuel ratio control amount is reset to a calibration constant (a) and maintained for a set time t (S40). The calibration constant a is set to '0'.

즉, 상기 공연비 제어량을 0%로 설정시간(약 0.5초) 동안 리셋 상태를 유지하는 것이다.That is, the air-fuel ratio control amount is maintained at the reset state for a set time (about 0.5 seconds) to 0%.

상기 단계(S40)에 이어, 설정시간(약, 0.5초)이 경과되면, ECU는 산소센서(미도시)의 신호를 입력받아 공연비 제어를 재개하여 그 공연비 제어량이 연료량 제어시(S60)의 공연비 보상 인자로 적용된다.(S50)After the set step (S40), when the set time (about 0.5 seconds) has elapsed, the ECU receives the signal of the oxygen sensor (not shown) and resumes the air-fuel ratio control so that the air-fuel ratio control amount is the air-fuel ratio at the time of fuel amount control (S60). It is applied as a compensation factor (S50).

즉, ECU는 상기 단계(S20, S30, S50)에서 각각 설정되는 공연비 제어량을 공연비 보상 인자로 하여 연료량을 제어하는 것이다.(S60)That is, the ECU controls the fuel amount using the air-fuel ratio control amount set in each of the above steps S20, S30, and S50 as the air-fuel ratio compensation factor.

상기한 바와 같이 이루어지는 본 발명의 액화석유가스 차량용 연료 제어방법에 의하면, 베이퍼라이저의 연료를 차량의 운전 조건에 맞추어 최적의 상태로 공급할 수 있도록 함과 동시에, 고속에서 아이들링 상태로 타행 주행시의 공연비 보상이 설정범위를 초과하여 진행하는 도중 운전영역(학습영역) 변경시 공연비 보상제어는 0%로 reset한 후, 일정시간(0.5초) 경과 후, 공연비 제어를 재개하여 왜곡된 연료량 학습치에 의한 공연비 보상량이 신규 운전영역에 적용되는 현상을 개선하여 피드백 제어할 수 있도록 함으로써, 엔진 스톨(stall)을 방지하고, 배기가스를 저감할 수 있도록 하는 효과가 있다. According to the fuel control method for a liquefied petroleum gas vehicle of the present invention made as described above, it is possible to supply the fuel of the vaporizer in the optimum state in accordance with the driving conditions of the vehicle, and at the same time, the air-fuel ratio compensation during the other run in the idling state at high speed The air-fuel ratio compensation control is reset to 0% when the operation area (learning area) is changed while the setting range is exceeded, and after a predetermined time (0.5 seconds), the air-fuel ratio control is resumed to compensate the air-fuel ratio by the distorted fuel amount learning value. By improving the phenomenon that the amount is applied to the new operating region to enable feedback control, there is an effect of preventing the engine stall and reducing the exhaust gas.

Claims (3)

시동 후, 설정시간이 경과한 상태이며, 냉각수온이 설정온도 이상의 조건을 적용조건으로 하여 상기 적용조건 하에서, 공연비 제어를 이루는 제1단계;A first step in which the set time has elapsed since the start-up, and the air temperature ratio is controlled under the application condition using the condition that the cooling water temperature is equal to or greater than the preset temperature; 상기 공연비 제어량이 설정범위내에 있는가는 판단하고, 설정범위 내에 있으면, 연료량 제어시의 공연비 보상 인자로 적용되는 제2단계;Judging whether the air-fuel ratio control amount is within a setting range, and if it is within the setting range, applying the air-fuel ratio control factor at the time of fuel amount control; 상기 제2단계에서, 공연비 제어량이 설정범위를 벗어나면, 주행중 연료량 학습영역이 천이(변경)되는가는 판단하여, 천이되지 않으면, 상기 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제3단계; In the second step, if the air-fuel ratio control amount is out of the setting range, it is determined whether the fuel amount learning region transitions (changes) during driving; and if it is not transitioned, the third step of applying the air-fuel ratio control amount as an air-fuel ratio compensation factor in controlling the fuel amount ; 상기 제3단계에서, 주행중 연료량 학습영역이 천이(변경)된 것으로 판단되면, 상기 공연비 제어량을 캘리브레이션 상수로 리셋하여 설정시간 동안 유지하는 제4단계와;In the third step, if it is determined that the fuel amount learning region has shifted (changed) while driving, resetting the air-fuel ratio control amount to a calibration constant and maintaining it for a set time; 상기 제4단계에 이어, 설정시간이 경과되면, 산소센서의 신호를 입력받아 공연비 제어를 재개하여 그 공연비 제어량이 연료량 제어시의 공연비 보상 인자로 적용되는 제5단계와;A fifth step following the fourth step, when the set time has elapsed, receiving the signal of the oxygen sensor to restart the air-fuel ratio control and applying the air-fuel ratio control amount as an air-fuel ratio compensation factor for controlling the fuel amount; 상기 제2단계, 제3단계, 및 제5단계에서 각각 설정되는 공연비 제어량을 공연비 보상 인자로 하여 연료량을 제어하는 제6단계; A sixth step of controlling the fuel amount using the air-fuel ratio control amount set in the second, third, and fifth steps as an air-fuel ratio compensation factor; 를 포함하는 액화석유가스 차량용 연료 제어방법.Fuel control method for liquefied petroleum gas vehicle comprising a. 삭제delete 제1항에 있어서, 상기 캘리브레이션 상수는 The method of claim 1, wherein the calibration constant '0'으로 하는 것을 특징으로 하는 액화석유가스 차량용 연료 제어방법.A fuel control method for a liquefied petroleum gas vehicle, characterized in that '0'.
KR1020020084192A 2002-12-26 2002-12-26 Method for controlling fuel of lpg vehicles KR100569057B1 (en)

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