KR100957155B1 - Method for fuel line diagnosis of liquified petroleum gas injection vehicle - Google Patents

Method for fuel line diagnosis of liquified petroleum gas injection vehicle Download PDF

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KR100957155B1
KR100957155B1 KR1020080040042A KR20080040042A KR100957155B1 KR 100957155 B1 KR100957155 B1 KR 100957155B1 KR 1020080040042 A KR1020080040042 A KR 1020080040042A KR 20080040042 A KR20080040042 A KR 20080040042A KR 100957155 B1 KR100957155 B1 KR 100957155B1
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fuel
pressure
fuel line
air
line
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KR1020080040042A
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Korean (ko)
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KR20090114219A (en
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박정주
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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
    • F02D19/02—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 gaseous fuels
    • F02D19/025—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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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
    • 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

본 발명은 엘피아이 차량(LIQUEFIED PETROLEUM GAS INJECTION)에서 연료라인의 압력 변화를 발생시키는 원인을 명확하게 검출하여 그에 따른 진단코드를 출력하는 것으로,The present invention is to clearly detect the cause of the pressure change of the fuel line in the vehicle (LIQUEFIED PETROLEUM GAS INJECTION) and output a diagnostic code accordingly

연료라인의 압력을 검출하여 공연비 희박 상태이면 연료량을 증량 보정하는 과정, 연료를 증량 보정하는 상태에서 연료라인의 압력이 정상으로 복귀되는지 판단하는 과정, 연료라인의 압력이 정상으로 복귀되면 연료라인의 압력 변화 횟수를 카운터 적산하는 과정, 적산된 압력 변화 횟수가 기준 횟수 이상이면 운전조건에 따른 연료량 분사를 제어하고 연료 펌프 이상의 고장코드를 출력하는 과정을 포함한다.Detecting the pressure in the fuel line and adjusting the amount of fuel if the air-fuel ratio is lean; determining whether the pressure in the fuel line returns to normal in the state of increasing the fuel; and if the pressure in the fuel line returns to normal, Counter-integrating the number of pressure changes, and controlling the injection of fuel amount according to the operating conditions and outputting a fault code of the fuel pump if the accumulated pressure change number is greater than or equal to the reference number.

엘피아이 차량, 연료 압력, 고장코드, 공연비 희박/농후 ELPI vehicle, fuel pressure, fault code, air / fuel

Description

엘피아이 차량의 연료라인 진단방법{METHOD FOR FUEL LINE DIAGNOSIS OF LIQUIFIED PETROLEUM GAS INJECTION VEHICLE}FUEL LINE DIAGNOSIS OF LIQUIFIED PETROLEUM GAS INJECTION VEHICLE}

본 발명은 엘피아이 차량(LIQUEFIED PETROLEUM GAS INJECTION)에 관한 것으로, 더 상세하게는 연료라인의 압력 변화를 발생시키는 원인을 명확하게 검출하여 그에 따른 진단코드를 출력하는 엘피아이 차량의 연료라인 진단방법에 관한 것이다.The present invention relates to an LIQUEFIED PETROLEUM GAS INJECTION. More particularly, the present invention relates to a method for diagnosing a fuel line of an ELPIA vehicle that specifically detects a cause of pressure change in a fuel line and outputs a diagnostic code accordingly. It is about.

엘피아이 차량은 LPG 차량의 봄베내에 연료펌프를 장착하여 수용된 LPG 연료를 액상의 상태로 압송하여 각 연소실에 분사되도록 하는 연료 계통을 채택하고 있는 차량을 지칭한다.The Elpia vehicle refers to a vehicle that has a fuel pump installed in a cylinder of an LPG vehicle, and employs a fuel system that pumps the received LPG fuel into a liquid state to be injected into each combustion chamber.

LPG 연료는 액상의 상태에서 온도 상승 또는 압력강하 등의 원인에 의하여 기상으로 상변환되면 그 부피가 250배로 증가하게 된다.LPG fuel increases its volume by 250 times when it is phase-converted to the gas phase due to a temperature rise or a pressure drop in a liquid state.

따라서, 엔진의 시동이 온을 유지하는 상태에서 LPG 연료의 상변환이 발생되면 연소실에 분사되는 연료의 실제양은 1/250밖에 되지 않기 때문에 엔진 정지가 발생되므로, 주행 중(아이들 포함) 엔진의 복사열에 의한 LPG연료의 상변환이 발생되지 않도록 봄베내의 수용된 연료를 가압하여 분사하고 있다.Therefore, if the phase change of LPG fuel occurs while the engine is kept on, the engine stop occurs because the actual amount of fuel injected into the combustion chamber is only 1/250, so that radiant heat of the engine during driving (including children) The injected fuel in the cylinder is pressurized to prevent phase conversion of the LPG fuel.

엘피아이 차량은 연료라인의 압력 유지가 매우 중요하므로, 연료 리턴라인에 압력센서를 배치하여 연료라인의 압력을 검출하며, 전자제어유닛은 압력센서의 신호를 기준으로 분사 연료량을 보정한다.Since the pressure of the fuel line is very important for the Elpia vehicle, the pressure sensor is disposed on the fuel return line to detect the pressure of the fuel line, and the electronic control unit corrects the amount of injected fuel based on the signal of the pressure sensor.

종래의 엘피아이 차량에 적용되는 전자제어유닛은 압력센서를 통해 연료라인의 압력을 검출하여 압력 저하가 검출되면 공연비가 희박하게 되므로, 이를 보상하기 위하여 연료량을 증가 보정한다.The electronic control unit applied to the conventional Elpia vehicle detects the pressure in the fuel line through a pressure sensor, and when the pressure drop is detected, the air-fuel ratio is lean, thereby increasing and correcting the fuel amount to compensate for this.

그리고, 연료량의 증가 보정에 따라 학습치가 증가하여 설정된 상한치에 도달한 상태에서 연료라인의 압력이 정상으로 복귀되면 공기가 덜 들어간 상태에서 많은 연료량의 분사가 진행되어 공연비가 농후한 상태로 전환된다.In addition, when the pressure of the fuel line returns to the normal state when the learning value increases according to the increase of the fuel amount and reaches the set upper limit value, the injection of a large amount of fuel is performed in a state where air is less and the air-fuel ratio is converted into a rich state.

이때, 전자제어유닛은 연료량을 감소 보정하여 안정된 공연비의 연소가 이루어지도록 유도하며, 이에 따른 연료량 학습을 실행한다.At this time, the electronic control unit reduces and corrects the fuel amount to induce a stable combustion of the air-fuel ratio, thereby performing the fuel amount learning.

전술한 방법을 통해 연료량을 보정함에 있어 공연비의 희박에 따라 증가 보정되는 연료량이 설정된 상한치에 도달하는 경우 설정된 일정시간, 대략적으로 40초 이후에 공연비 희박에 대한 고장코드를 출력한다.When the fuel amount is corrected by the above-described method, when the fuel amount increased and corrected according to the lean air fuel ratio reaches the set upper limit value, the fault code for the air fuel lean is output after a predetermined time, approximately 40 seconds.

그리고, 연료량의 증가 보정에 따라 학습치가 설정된 상한치에 도달하는 경우 설정된 일정시간, 대략적으로 60초 이후에 공연비 희박에 대한 고장코드를 출력한다.When the learning value reaches the set upper limit value according to the increase in fuel amount, the fault code for the air-fuel ratio lean is output after a predetermined time, approximately 60 seconds.

또한, 연료의 증가 보정으로 학습치가 상한치에 도달된 상태에서 연료라인의 압력이 정상으로 회복됨에 따라 감소 보정되는 연료량이 설정된 하한치에 도달되면 설정된 일정시간, 대략적으로 40초 이후에 공연비 농후에 대한 고장코드를 출력한 다.In addition, when the fuel level is reduced and corrected as the pressure of the fuel line is restored to the normal state when the learning value reaches the upper limit due to the increase of fuel, the failure of the air-fuel ratio rich after a predetermined time, approximately 40 seconds, is set. Print the code.

그리고, 연료량의 감소 보정에 따라 학습치가 설정된 하한치에 도달하는 경우 설정된 일정시간, 대략적으로 60초 이후에 공연비 농후에 대한 고장코드를 출력한다.When the learning value reaches the set lower limit value according to the reduction of the fuel amount, a fault code for the air-fuel ratio rich is output after a predetermined time, approximately 60 seconds.

상기와 같이 연료라인의 압력 불안정에 따른 연료량의 증감 보정으로 불필요한 고장코드가 빈번하게 출력되는 오동작으로 산소센서, 연료펌프 등 고가의 연료계 부품의 교환이 이루어지는 문제점이 있다.As described above, there is a problem in that expensive fuel-based parts such as an oxygen sensor and a fuel pump are replaced by malfunctions in which unnecessary trouble codes are frequently output due to the increase or decrease of fuel amount due to pressure instability of the fuel line.

또한, 오진단에 따른 부품의 교환으로 차량의 안정성 및 신뢰성을 저하시키는 문제점이 있다.In addition, there is a problem of lowering the stability and reliability of the vehicle by replacement of parts due to misdiagnosis.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 엘피아이 차량에서 연료라인의 압력 변화를 유발시키는 원인을 명확하게 진단하여 불필요한 고장코드가 출력되는 것을 방지하고, 이에 따라 불필요한 부품의 교환이 발생되지 않도록 하는 것이다.The present invention has been invented to solve the above problems, and its object is to clearly diagnose the cause of the pressure change of the fuel line in the vehicle, and to prevent unnecessary trouble codes from being output, thereby preventing unnecessary parts. To avoid the exchange.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 엘피아이 차량의 연료라인 진단방법은, 연료라인의 압력을 검출하여 공연비 희박 상태이면 연료를 증량 보정하는 과정; 연료를 증량 보정하는 상태에서 연료라인의 압력이 정상으로 복귀되는지 판단하는 과정; 연료라인의 압력이 정상으로 복귀되면 연료라인의 압력 변 화 횟수를 카운터 적산하는 과정; 적산된 압력 변화 횟수가 기준 횟수 이상이면 운전조건에 따른 연료량 분사를 제어하고 연료 펌프 이상의 고장코드를 출력하는 과정을 포함한다.According to an aspect of the present invention, there is provided a method for diagnosing a fuel line of an Elpia vehicle. The method may further include: correcting fuel if the fuel line pressure is detected and the fuel ratio is lean; Determining whether the pressure in the fuel line returns to normal in the state of increasing and correcting the fuel; Counter-accumulating the frequency change of the fuel line when the pressure of the fuel line returns to normal; If the accumulated number of pressure changes is greater than or equal to the reference number, the method may include controlling fuel injection according to an operating condition and outputting a fault code of the fuel pump.

전술한 구성에 의하여 본 발명은 엘피아이 차량에서 연료 라인의 이상 원인을 명확하게 진단하여 필요한 부품만의 교환이 제공되도록 함으로써 운행에 안정성 및 신뢰성을 향상시키는 효과를 기대할 수 있다.According to the above-described configuration, the present invention can expect the effect of improving safety and reliability in driving by providing a replacement of only necessary parts by clearly diagnosing the cause of abnormal fuel lines in the vehicle.

아래에서는 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

본 발명은 여러 가지 상이한 형태로 구현될 수 있으므로 여기에서 설명하는 실시예에 한정되지 않으며, 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였다.Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

도 1은 본 발명의 실시예에 따른 엘피아이 차량의 시스템 구성도이다.1 is a system configuration diagram of an Elpia vehicle according to an embodiment of the present invention.

도시된 바와 같이, LPG 연료를 액상의 상태로 수용하는 봄베(10)와 엔진(40)의 연소실에 장착되는 인젝터(50)는 연료 공급라인(20)과 연료 리턴라인(30)으로 연결된다.As shown, the cylinder 10 for receiving LPG fuel in a liquid state and the injector 50 mounted in the combustion chamber of the engine 40 are connected to the fuel supply line 20 and the fuel return line 30.

상기 연료 공급라인(20)에는 봄베(10)내에서 연료를 가압하여 압송하는 연료펌프(11)가 배치되고, 이 연료펌프(11)와 연결되는 연료 공급라인에 멀티밸브(12) 와 셔트 오프 밸브(21) 및 연료온도 센서(22)가 순차적으로 배치된다.The fuel supply line 20 has a fuel pump 11 for pressurizing and pumping fuel in the cylinder 10, the multi-valve 12 and the shut-off in the fuel supply line connected to the fuel pump 11 The valve 21 and the fuel temperature sensor 22 are sequentially arranged.

상기 연료 리턴라인(30)에는 인젝터(50)에 액상의 상태로 봄베(10)의 압력에 대비하여 일정압력(△P), 대략 5bar 이상의 압력이 걸리도록 조정하는 압력조절밸브(31)와 인젝터(50)에 걸리는 연료의 압력을 검출하는 연료 압력센서(32)가 배치된다.The fuel return line 30 injects a pressure control valve 31 and an injector to adjust the pressure to be applied at a constant pressure ΔP and a pressure of approximately 5 bar or more against the pressure of the cylinder 10 in a liquid state in the injector 50. The fuel pressure sensor 32 which detects the pressure of the fuel applied to the 50 is arrange | positioned.

상기 인젝터(50), 연료펌프(11), 멀티밸브(12), 셔트 오프 밸브(21), 연료온도 센서(22), 연료 압력센서(32)는 인터페이스(80)를 통해 전자제어유닛(90)과 전기적으로 연결되어 제어된다.The injector 50, the fuel pump 11, the multivalve 12, the shutoff valve 21, the fuel temperature sensor 22, and the fuel pressure sensor 32 are connected to the electronic control unit 90 via an interface 80. Is electrically connected and controlled.

또한, 흡기계통(60)에는 연소실로 유입되는 공기의 온도를 검출하는 흡기온 센서(61), 공기량을 검출하는 맵 센서(62), 아이들 스피드 액츄에이터(63), 가속페달에 연동되어 작동하는 스로틀 밸브의 개도를 검출하는 스로틀 포지션 센서(64) 등이 구비된다.In addition, the intake cylinder 60 has an intake air temperature sensor 61 for detecting the temperature of the air flowing into the combustion chamber, a map sensor 62 for detecting the amount of air, an idle speed actuator 63, and a throttle operated in conjunction with the accelerator pedal. The throttle position sensor 64 etc. which detect the opening degree of a valve are provided.

배기계통(70)에는 산소센서(71)를 구비하고, 엔진(40) 자체에는 냉각수의 온도를 검출하는 수온센서(41) 및 엔진(40)이 동작되는 상태에서 크랭크 샤프트의 각도를 크랭크 포지션 센서(42)등을 구비된다.The exhaust system 70 includes an oxygen sensor 71, and the engine 40 itself cranks the position of the crankshaft in the state where the water temperature sensor 41 for detecting the temperature of the cooling water and the engine 40 are operated. 42 and the like.

상기 흡기계통(60)과 배기계통(70) 및 엔진(40)에 장착되는 각 구성 요소는 엔진운전에 필요한 정보를 전자제어유닛(90)에 공급하거나 전자제어유닛(90)의 제어신호에 따라 제어되면서 최적의 상태로 운전이 이루어지게 한다.Each component mounted in the intake system 60, the exhaust system 70, and the engine 40 supplies information necessary for engine operation to the electronic control unit 90 or according to a control signal of the electronic control unit 90. Controlled operation ensures optimal operation.

전술한 바와 같은 기능이 포함되어 구성되는 본 발명에 따른 엘피아이 차량에서 연료라인을 진단하는 동작에 대하여 도 2를 참조하여 설명하면 다음과 같다.An operation of diagnosing a fuel line in the vehicle according to the present invention, which includes the above-described function, will be described with reference to FIG. 2.

엔진의 시동이 온 되면 연료 리턴라인(30)에 배치되는 연료 압력센서(32)는 연료라인에 형성되는 압력을 검출하여 인터페이스(80)를 통해 전자제어유닛(90)에 제공한다(S101).When the engine is turned on, the fuel pressure sensor 32 disposed in the fuel return line 30 detects the pressure formed in the fuel line and provides the pressure to the electronic control unit 90 through the interface 80 (S101).

이때, 전자제어유닛(90)은 연료 압력센서(32)의 정보를 분석하여 연료라인의 압력이 설정된 기준압력 이하의 상태로 검출되는지 판단한다(S102).At this time, the electronic control unit 90 analyzes the information of the fuel pressure sensor 32 to determine whether the pressure of the fuel line is detected to be below the set reference pressure (S102).

상기 S102의 판단에서 기준압력 이하의 상태로 판단되면 공연비 희박 연소가 진행되어 엔진이 정상적인 출력 토크를 확보하지 못하는 상태로 판단하여 연료량 증가 제어를 실행한다(S103).If it is determined that the state is less than the reference pressure in the determination of S102, the air-fuel ratio lean combustion proceeds to determine that the engine does not secure the normal output torque to perform fuel amount increase control (S103).

연료량 증가 제어에 따라 연료량 학습치가 증가하며(S104), 연료량 증가 제어가 진행되는 과정에서 연료라인의 압력을 검출하여(S105) 정상 압력으로 복귀되었는지를 판단한다(S106).The fuel amount learning value is increased according to the fuel amount increase control (S104), and the pressure of the fuel line is detected (S105) in the process of the fuel amount increase control (S105) to determine whether it is returned to the normal pressure (S106).

상기 S106의 판단에서 연료라인의 압력이 정상으로 복귀되지 않으면 연료계의 이상에 의한 고장으로 판정하여 고장코드를 출력하고 림프 홈 모드로 진입한다(S107).If the pressure of the fuel line does not return to normal in the determination of S106, it is determined that the failure is caused by an abnormality of the fuel system, and outputs a fault code and enters the lymph groove mode (S107).

그러나, 연료라인의 압력이 정상으로 복귀되었으면 연료라인의 압력이 저하되었다가 정상으로 복귀된 횟수를 카운터하여 적산하며(S108), 적산된 카운터 횟수가 설정된 기준횟수, 예를 들어 20회 이상인지를 판단한다(S109).However, if the pressure of the fuel line returns to normal, the pressure of the fuel line decreases and then returns to normal by counting the number of times of returning to normal (S108), and whether the accumulated number of counters is a set reference number, for example, 20 or more times. It is determined (S109).

상기 기준횟수는 설계자에 따라 그 횟수는 가변적으로 설정 가능하다.The reference number of times can be set variably according to the designer.

상기 S109의 판단에서 적산된 카운터 횟수가 설정된 기준횟수 이상이면 공기량, 스로틀 밸브의 개도율, 공연비 제어값 등을 포함하는 제반 운전정보를 감안하 여 최종 연료량을 결정한다(S110).If the counter count integrated in the determination of S109 is equal to or greater than the set reference number, the final fuel amount is determined in consideration of all operation information including an air amount, an opening ratio of the throttle valve, an air-fuel ratio control value, and the like (S110).

상기 결정된 최종 연료량의 분사를 통해 이론 공연비의 연소가 실행되도록 하며(S111), 공연비 관련 고장코드가 출력되는 것을 방지한다(S112).The combustion of the theoretical air-fuel ratio is performed through the injection of the determined final fuel amount (S111), and the error code associated with the air-fuel ratio is prevented from being output (S112).

그리고, 연료라인에서의 간헐적인 연료압력의 저하는 연료 펌프(11)의 문제에서 기인한 것으로 판단하여 연료펌프 고장코드를 출력한다(S113).Then, it is determined that the intermittent decrease in the fuel pressure in the fuel line is caused by the problem of the fuel pump 11, and outputs the fuel pump failure code (S113).

또한, 상기 S109의 판단에서 적산된 카운터 횟수가 설정된 기준횟수를 이하이면 현재의 운전조건에 따른 최종 연료량을 결정하여 이론 공연비의 연소가 실행되도록 한다(S114)(S115). In addition, if the counter count integrated in the determination of S109 is less than or equal to the set reference number, the final fuel amount according to the current operating condition is determined to perform combustion of the theoretical air-fuel ratio (S114) (S115).

이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 포함된다.   Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

도 1은 본 발명의 실시예에 따른 엘피아이 차량의 시스템 구성도이다.1 is a system configuration diagram of an Elpia vehicle according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 엘피아이 차량에서 연료라인 진단 절차를 도시한 흐름도이다.2 is a flowchart illustrating a fuel line diagnosis procedure in an Elpia vehicle according to an embodiment of the present invention.

Claims (3)

연료라인의 압력을 검출하여 공연비 희박 상태이면 연료를 증량 보정하는 과정;Detecting a pressure in the fuel line and correcting the fuel if the air-fuel ratio is lean; 연료를 증량 보정하는 상태에서 연료라인의 압력이 정상으로 복귀되는지 판단하는 과정;Determining whether the pressure in the fuel line returns to normal in the state of increasing and correcting the fuel; 연료라인의 압력이 정상으로 복귀되면 연료라인의 압력 변화 횟수를 카운터 적산하는 과정;Counter-accumulating the number of changes in pressure in the fuel line when the pressure in the fuel line returns to normal; 적산된 압력 변화 횟수가 기준 횟수 이상이면 운전조건에 따른 연료량 분사를 제어하고 연료 펌프 이상의 고장코드를 출력하는 과정을 포함하는 엘피아이 차량의 연료라인 진단방법. And controlling the fuel amount injection according to the driving conditions and outputting a fault code of the fuel pump when the accumulated pressure change number is greater than or equal to the reference number. 제1항에 있어서,The method of claim 1, 상기 공연비 희박에 따른 연료의 증량 보정에서 연료라인의 압력이 정상으로 복귀되지 않으면 연료계 이상의 고장코드를 출력하는 과정을 포함하는 엘피아이 차량의 연료라인 진단방법.If the pressure of the fuel line does not return to normal in the increase in fuel due to the air-fuel ratio is lean, the fuel line diagnostic method of the Elpia vehicle comprising the step of outputting a fault code of the fuel system. 제1항에 있어서,The method of claim 1, 상기 적산된 압력 변화 횟수가 기준횟수 이하이면 최종 연료량을 결정한 다음 공연비 제어만을 실행한 후 종료하는 과정을 더 포함하는 엘피아이 차량의 연료 라인 진단방법. The method of diagnosing the fuel line of the Elpia vehicle further comprises the step of determining the final fuel amount, and then executing only the air-fuel ratio control when the accumulated pressure change number is less than or equal to the reference frequency.
KR1020080040042A 2008-04-29 2008-04-29 Method for fuel line diagnosis of liquified petroleum gas injection vehicle KR100957155B1 (en)

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JP2001193571A (en) 2000-01-12 2001-07-17 Hitachi Ltd Diagnostic device for gaseous fuel engine
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