KR20030005873A - Injector disorder determining method in travelling the vehicle - Google Patents

Injector disorder determining method in travelling the vehicle Download PDF

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Publication number
KR20030005873A
KR20030005873A KR1020010041336A KR20010041336A KR20030005873A KR 20030005873 A KR20030005873 A KR 20030005873A KR 1020010041336 A KR1020010041336 A KR 1020010041336A KR 20010041336 A KR20010041336 A KR 20010041336A KR 20030005873 A KR20030005873 A KR 20030005873A
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South Korea
Prior art keywords
injector
fuel cut
upper limit
oxygen sensor
output voltage
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KR1020010041336A
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Korean (ko)
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KR100418617B1 (en
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나정욱
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기아자동차주식회사
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Priority to KR10-2001-0041336A priority Critical patent/KR100418617B1/en
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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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • 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
    • F02D2041/228—Warning displays

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A method of detecting injector fail in case of fuel cut operation during driving is provided to subdivide diagnosis of fail, facilitate careful driving, and improve fuel consumption ratio. CONSTITUTION: An engine control unit decides whether the current engine state is in a fuel cut state through a fuel cut-detecting unit during driving. If the engine is in a fuel cut state, the engine control unit outputs a cut-off signal to an injector driving unit, stops injection of an injector, detects the output voltage of an oxygen sensor, and detects whether the output voltage is the upper limit caused by fuel cut. If the engine is not in fuel cut state or the output value of the oxygen sensor is not the upper limit caused by fuel cut, the engine control unit decides injector new monitoring detection area. If the output voltage of the oxygen sensor is over the upper limit, the engine control unit stops injector new monitoring for predetermined time, performs injector new monitoring, detects the output voltage of the oxygen sensor again, and decides whether the detected voltage is below the predetermined voltage under the upper limit during predetermined time. The output voltage is not maintained below the predetermined temperature under the upper limit during predetermined time. The engine control unit decides the injector is normal. If the output voltage is maintained, leakage from the injector is decided and an indicating lamp is turned on.

Description

주행중 퓨얼 컷 작동시 인젝터 고장 판단방법{INJECTOR DISORDER DETERMINING METHOD IN TRAVELLING THE VEHICLE}How to determine injector failure during fuel cut operation while driving {INJECTOR DISORDER DETERMINING METHOD IN TRAVELLING THE VEHICLE}

본 발명은 주행중 퓨얼 컷 작동시 인젝터 고장 판단방법에 관한 것으로 더욱 상세히는, 자동차의 주행중 엔진의 상태가 퓨얼 컷(Fuel Cut) 상태이면 인젝션을 금지시키고 산소센서의 출력전압을 검출하여 퓨얼 컷으로 인한 상한치이면 인젝터 누유 모니터링을 소정시간 금지시키고 인젝터 누유 모니터링을 실시한 후 다시 산소센서의 출력전압을 검출하여 상한치 이하에서의 소정전압 이하가 정해진 시간 이상 지속되면 인젝터에서 누유가 일어난 것으로 판정하여 램프를 점등시키는 방식을 통해 고장진단의 세분화를 꾀할 수 있고, 안전운행에 도움을 줄 수 있도록 함과 동시에 연비를 대폭 향상시킬 수 있도록 발명한 것이다.The present invention relates to a method of determining an injector failure during a fuel cut operation while driving. More specifically, when the engine is in a fuel cut state while driving a vehicle, the injection is prohibited and the output voltage of the oxygen sensor is detected. If the upper limit value, the injector leakage monitoring is prohibited for a predetermined time, and after the injector leakage monitoring is performed, the output voltage of the oxygen sensor is detected again, and when the predetermined voltage below the upper limit is maintained for more than the predetermined time, it is determined that the leakage occurs in the injector and the lamp is turned on. Through the method, it is possible to subdivide the fault diagnosis, to help safe operation, and to improve fuel efficiency.

종래 자동차에서의 인젝터 구동은, 전원인가를 시간으로 조절하여 동일한 압력에서 시간에 따라 인젝터의 증량으로 연료의 공급을 하고 있고, 또 인적터 전원인가시 인젝터 내부의 솔밸브의 전원인가로 인하여 니들밸브를 들어 올림으로써 인젝션을 해 주게 되어 있다.In the injector driving of a conventional vehicle, the supply of fuel is supplied by increasing the injector according to the time under the same pressure by adjusting the power supply to the time, and the needle valve is applied due to the power supply of the solenoid valve inside the injector when the injector power is applied. It is to be injected by lifting.

한편, 종래의 자동차에서 인젝터에 대한 고장진단은 단선, 단락 및 학습치에 피드백 시스템의 불균형으로 단품 자체의 문제를 추정할 뿐이다.On the other hand, the failure diagnosis of the injector in the conventional vehicle only estimates the problem of the unit itself due to the unbalance of the feedback system on disconnection, short circuit and learning value.

이와같은 종래의 고장진단 중 단락, 단선은 엔진 콘트롤 유니트에서 스위체크가 가능하나, 인젝터의 니들밸브가 들어올려져 항상 오픈이 되어 있는 경우 이를 체크할만한 방법이 없다.In the conventional fault diagnosis, short circuit and disconnection can be switched in the engine control unit. However, there is no way to check if the needle valve of the injector is lifted and always open.

특히 4기통 및 6기통 엔진에서 4 내지 6개의 인젝터 중 1개의 인젝터가 계속 오픈이 되어 있는 상태라고 한다면 연료의 공급은 계속되어지므로 결국은 농후한 배출가스가 생성되나, 이 배출가스는 배기 메니폴드내에서 정상 배기가스와 합쳐져 희석되므로 한개의 산소센서를 통해 배기가스 상태를 검출, 피드백을 하여 학습이 진행되는 형태에서는 인젝터 오픈의 문제를 찾아내기가 힘드는 실정이다.Especially in the case of four- and six-cylinder engines, if one of the four to six injectors remains open, fuel supply is continued, resulting in a rich exhaust gas, but this exhaust gas is in the exhaust manifold. It is difficult to find the problem of injector opening in the form of learning that progresses by detecting and feedbacking the exhaust gas state through one oxygen sensor because it is diluted with normal exhaust gas.

따라서, 종래의 자동차에서는 상기와 같은 문제가 발생되었을시 연료가 과다하게 소비될 뿐만 아니라 엔진 안정화에 상당한 영향을 끼치는 등의 문제점이 있다.Therefore, in the conventional vehicle, when such a problem occurs, not only the fuel is excessively consumed but also has a significant influence on engine stabilization.

본 발명은 이와같은 종래의 제반 문제점을 해결하기 위하여 안출된 것으로, 수개의 인젝터 중 어느 하나에서라도 오픈이 일어나면 이를 즉시 검출하여 모니터링하는 방식을 통해 고장진단의 세분화를 꾀할 수 있고, 또 안전운행에 도움을 줄 수 있음은 물론 연비를 대폭 향상시킬 수 있는 자동차의 주행중 퓨얼 컷 작동시 인젝터 고장 판단방법을 제공하는데 그 목적이 있다.The present invention has been made to solve such a conventional problem, it is possible to subdivide the failure diagnosis through the method of immediately detecting and monitoring when the opening occurs in any one of several injectors, and also helps in safe operation The purpose of the present invention is to provide an injector failure determination method during fuel cut operation of a vehicle that can significantly improve fuel economy.

상기한 본 발명의 목적은, 자동차의 주행중 엔진의 상태가 퓨얼 컷(Fuel Cut) 상태이면 인젝션을 금지시키고 산소센서의 출력전압을 검출하여 퓨얼 컷으로 인한 상한치이면 인젝터 누유 모니터링을 소정시간 금지시키고 인젝터 누유 모니터링을 실시한 후 다시 산소센서의 출력전압을 검출하여 상한치 이하에서의 소정전압 이하가 정해진 시간 이상 지속되면 인젝터에서 누유가 일어난 것으로 판정하여 램프를 점등시키므로써 달성할 수 있다.The above object of the present invention is to prohibit the injection when the engine is fuel cut state while driving the vehicle, and to detect the output voltage of the oxygen sensor to prohibit the injector leakage monitoring for a predetermined time if the upper limit due to the fuel cut. After the oil leakage monitoring is performed again, the output voltage of the oxygen sensor is detected again, and when the predetermined voltage below the upper limit value is maintained for more than a predetermined time, it can be achieved by determining that leakage occurs in the injector and turning on the lamp.

따라서, 고장진단의 세분화와, 안전운행 및 공연비를 대폴 향상시킬 수 있는 것이다.Therefore, the breakdown of failure diagnosis, safety operation and air-fuel ratio can be greatly improved.

도 1은 본 발명 방법이 적용된 장치의 블럭 구성도.1 is a block diagram of an apparatus to which the present invention is applied.

도 2는 본 발명 방법을 설명하기 위한 플로우챠트.2 is a flowchart for explaining the method of the present invention.

도 3의 (a)(b)는 인젝터가 정상일 경우의 퓨얼 컷시 산소센서의 변화를 나타낸 그래프.Figure 3 (a) (b) is a graph showing the change of the oxygen sensor during fuel cut when the injector is normal.

도 4의 (a)(b)는 인젝터 누유시 연료 공급에 의한 산소센서의 출력치 변화를 나타낸 그래프.Figure 4 (a) (b) is a graph showing the change in the output value of the oxygen sensor by the fuel supply when the injector leakage.

* 도면중 주요 부분에 대한 부호의 설명 *Explanation of symbols on main parts of drawing

1 : 엔진 콘트롤 유니트2 : 퓨얼 컷 검출부1: Engine control unit 2: Fuel cut detector

3 : 인젝터 구동부4 : 산소센서3: injector drive unit 4: oxygen sensor

5 : 타이머6 : 표시램프5: timer 6: display lamp

7 : 엔진8 : 인젝터7: engine 8: injector

이하, 첨부된 도면에 의거하여 본 발명의 바람직한 실시예를 상세히 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명 방법이 적용된 장치의 블럭 구성도를 나타낸 것이고, 도 2는 본 발명 방법을 설명하기 위한 플로우챠트를 나타낸 것이며, 도 3의 (a)(b)는 인젝터가 정상일 경우의 퓨얼 컷시 산소센서의 변화를 나타낸 그래프를 나타낸 것이고, 도 4의 (a)(b)는 인젝터 누유시 연료 공급에 의한 산소센서의 출력치 변화를 나타낸 그래프를 나타낸 것이다.1 is a block diagram of an apparatus to which the method of the present invention is applied, and FIG. 2 is a flowchart illustrating the method of the present invention, and FIGS. 3A and 3B are fuel cuts when the injector is normal. A graph showing a change in the oxygen sensor is shown, and FIG. 4 (a) (b) shows a graph showing a change in output value of the oxygen sensor by fuel supply when the injector is leaked.

이에 따르면, 자동차의 주행 중 엔진 콘트롤 유니트(1)에서 퓨얼 컷 검출부(2)를 통해 현재 엔진의 상태가 퓨얼 컷 상태인지를 계속해서 검출하는 단계와;According to this, the engine control unit 1 continuously detects whether the state of the current engine is the fuel cut state through the fuel cut detection unit 2 while the vehicle is being driven;

상기에서 검출한 결과 자동차의 주행중 엔진이 퓨얼 컷 상태이면 인젝터 구동부(3)에 차단신호를 출력시켜 엔진(7)에 설치되어 있는 인젝터(8)의 인젝션을 금지시킨 후 산소센서(4)의 출력전압을 검출하여 퓨얼 컷으로 인한 상한치(X V)인지를 검출하는 단계와;As a result of detection as described above, if the engine is in the fuel cut state while driving the vehicle, a shutoff signal is output to the injector driver 3 to prohibit the injection of the injector 8 installed in the engine 7, and then the output of the oxygen sensor 4. Detecting a voltage to detect whether an upper limit due to a fuel cut is XV;

상기에서 검출한 결과 현재 엔진의 상태가 퓨얼 컷 상태가 아니거나, 산소센서(4)의 출력값이 퓨얼 컷으로 인한 상한치(X V)가 아니면(즉, 미만이면) 인젝터 누유 모니터링 검지영역으로 판별하는 단계와;If the current engine state is not the fuel cut state or the output value of the oxygen sensor 4 is not the upper limit value XV due to the fuel cut (i.e., less than) as a result of the detection, determining the injector leakage monitoring monitoring area. Wow;

상기에서 검출한 결과 산소센서(4)의 출력전압이 퓨얼 컷으로 인한 상한치(X V) 이상이면 인젝터 누유 모니터링을 타이머(5)에 의해 설정된 시간(T1 : 예를들어 2초) 만큼 금지시킨 다음 그 시간이 경과되면 인젝터 누유 모니터링을 실시한 후, 다시 산소센서(4)의 출력전압을 검출하여 상한치(X V) 이하에서의 소정전압(Y V: 예를들어 0.1V) 이하가 정해진 시간(T2 : 예를들어 10초) 이상 지속되는지를 검출하는 단계와;As a result of the above detection, if the output voltage of the oxygen sensor 4 is equal to or higher than the upper limit value XV due to the fuel cut, the injector leakage monitoring is prohibited by the time set by the timer 5 (for example, 2 seconds), and then After the elapse of time, the injector leak monitoring is performed, and then the output voltage of the oxygen sensor 4 is detected again, and the predetermined time (YV: 0.1 V) below the upper limit value XV is determined. For example, 10 seconds) or more;

상기에서 검출한 결과, 산소센서(4)의 출력전압이 상한치(X V) 이하에서의 소정전압(Y V: 예를들어 0.1V) 이하가 정해진 시간(T2 : 예를들어 10초) 이상 지속되지 않으면 인젝터(8)가 정상임으로 판정하고, 지속되면 인젝터에서 누유가 일어난 것으로 판정하고 표시램프(6)를 점등시키는 단계;로 이루어진 것을 특징으로한다.As a result of the above detection, if the output voltage of the oxygen sensor 4 does not last longer than the predetermined voltage (YV: 0.1V) below the upper limit value XV for a predetermined time (T2: 10 seconds, for example) Determining that the injector 8 is normal, and if it continues, determining that the oil leakage has occurred in the injector and lighting the display lamp (6).

이와같은 단계로 이루어진 본 발명 방법에 따를 작용효과를 설명하면 다음과 같다.Referring to the effect according to the method of the present invention made of such steps are as follows.

먼저 대부분의 자동차에서는 일반적으로 연료소비를 줄이기 위하여 부하가 적고 급격한 스로틀 위치 센서(TPS)의 변화시 즉, 일정속도 이상 주행중 브레이크 작동시 엔진제어는 퓨얼 컷을 통하여 연료의 공급을 중단시킨다.First, in most vehicles, in order to reduce fuel consumption, the engine control stops supplying fuel through the fuel cut when the load is light and the throttle position sensor (TPS) is changed, that is, when the brake is operated while driving over a certain speed.

이때, 배출가스의 산소성분을 제어 피드백을 하는 산소센서(4)의 경우 출력전압이 거의 상한치로 고정되어 있다.At this time, in the case of the oxygen sensor 4 which gives control feedback of the oxygen component of the exhaust gas, the output voltage is fixed to the upper limit almost.

본 발명은 이러한 원리를 이용하여 퓨얼 컷시의 인젝터 누유에 의한 고장진단을 행할 수 있도록 한 것이다.The present invention makes it possible to perform failure diagnosis by injector leakage during fuel cut using this principle.

즉, 퓨얼 컷 구간이 되면 엔진 콘트롤 유니트(1)은 인젝터의 구동을 차단하고 연료의 공급을 중단한다.That is, when the fuel cut period is reached, the engine control unit 1 stops driving the injector and stops supply of fuel.

이때, 산소센서(4)의 출력전압을 엔진 제어 유니트(1)에서 모니터링하여 퓨얼 컷시에도 산소센서(4)에서 변화가 있는지를 판단한다.At this time, the output voltage of the oxygen sensor 4 is monitored by the engine control unit 1 to determine whether there is a change in the oxygen sensor 4 even during fuel cut.

그 결과 변화가 있으면 인젝터 누유라는 고장 판정을 하고, 표시램프(6)를 점등시켜 정보를 알린다.As a result, if there is a change, a failure determination of the injector leakage is made, and the display lamp 6 is turned on to inform the information.

이는 상기 엔진 제어 유니트(1)에서는 퓨얼 컷을 명령했음에도 불구하고 1개의 인젝터라도 누유의 흔적이 보인다면 배출가스에 유입되어 산소센서(4)의 반전을 유도하는 원리를 이용한 것이다.The engine control unit 1 uses the principle of inducing the inversion of the oxygen sensor 4 by flowing into the exhaust gas even if one injector shows traces of leakage despite the command of the fuel cut.

다시말해서, 자동차의 주행 중 상기 엔진 콘트롤 유니트(1)에서 퓨얼 컷 검출부(2)를 통해 현재 엔진의 상태를 계속해서 검출하여, 만약 자동차의 주행중 엔진이 퓨얼 컷 상태인 것으로 판단되면(즉, 상기 퓨얼 컷 검출부(2)에서 도 3 및 3 사의 (a)와 같은 출력신호가 발생되면) 인젝터 구동부(3)에 차단신호를 출력시켜 인젝션이 금지되도록한 후 산소센서(4)의 출력전압을 검출하여 퓨얼 컷으로 인한 상한치(X V)인지를 검출하게 된다.In other words, the engine control unit 1 continuously detects the current engine state through the fuel cut detection unit 2 while the vehicle is running, and if it is determined that the engine is in the fuel cut state while driving the vehicle (i.e., When an output signal such as (a) of FIGS. 3 and 3 is generated by the fuel cut detector 2, a cutoff signal is output to the injector driver 3 so that the injection is prohibited, and then the output voltage of the oxygen sensor 4 is detected. The upper limit value XV due to the fuel cut is detected.

그 결과 현재 엔진의 상태가 퓨얼 컷 상태가 아니거나, 산소센서(4)의 출력값이 퓨얼 컷으로 인한 상한치(X V) 미만이면 인젝터 누유 모니터링 검지영역으로 판별한다.As a result, if the state of the current engine is not the fuel cut state, or if the output value of the oxygen sensor 4 is less than the upper limit value XV due to the fuel cut, it is determined as the injector leakage monitoring monitoring area.

그러나, 상기에서 검출한 결과 산소센서(4)의 출력전압이 퓨얼 컷으로 인한 상한치(X V) 이상이면 인젝터 누유 모니터링을 타이머(5)에 의해 설정된 시간(T1) 즉, 약 2초 동안 금지시킨 다음, 인젝터 누유 모니터링을 실시한 후, 다시 산소센서(4)의 출력전압을 검출하여 상한치(X V) 이하에서의 소정전압(Y V), 예를들어 0.1V 이하가 정해진 시간(T2 : 예를들어 10초) 이상 지속되는지를 검출하게 된다.However, if the output voltage of the oxygen sensor 4 is above the upper limit value XV due to the fuel cut, the injector leakage monitoring is inhibited for the time T1 set by the timer 5, that is, about 2 seconds. After the injector leakage monitoring is performed, the output voltage of the oxygen sensor 4 is detected again, and a predetermined time YV below the upper limit value XV, for example, a predetermined time (T2: for example, 10 seconds) is set. Will continue to detect abnormality.

그 결과, 산소센서(4)의 출력전압이 상한치(X V) 이하에서의 소정전압(Y V: 예를들어 0.1V) 이하가 정해진 시간(T2 : 예를들어 10초) 이상 지속되지 않으면(즉, 상기 산소센서(4)의 출력전압이 도 3의 (b)와 같은 상태이면) 인젝터(8)가 정상임으로 판정한다.As a result, if the output voltage of the oxygen sensor 4 does not last longer than a predetermined time (T2: for example, 10 seconds) below the predetermined voltage (YV: for example, 0.1V) below the upper limit value (XV) (that is, If the output voltage of the oxygen sensor 4 is in the same state as in Fig. 3B, it is determined that the injector 8 is normal.

그러나, 산소센서(4)의 출력전압이 상한치(X V) 이하에서의 소정전압(Y V: 예를들어 0.1V) 이하가 정해진 시간(T2 : 예를들어 10초) 이상 지속되되어 상기 산소센서(4)의 출력전압이 도 4의 (b)와 같은 상태이면 인젝터에서 누유가 일어난 것으로 판정하고 표시램프(6)를 점등시켜 주므로써 운전자 등이 이를 즉시 인지하고 빠른 시간내에 정비를 받을 수 있는 것이다.However, the output voltage of the oxygen sensor 4 lasts for a predetermined time (T2: for example, 10 seconds) below the predetermined voltage (YV: for example, 0.1 V) below the upper limit value XV, so that the oxygen sensor ( If the output voltage of 4) is the same as that of Fig. 4 (b), it is determined that leakage has occurred in the injector, and the indicator lamp 6 is turned on so that the driver or the like can immediately recognize it and receive maintenance in a short time. .

이상에서 설명한 바와 같이 본 발명에 의하면, 수개의 인젝터 중 어느 하나에서라도 오픈이 일어나면 이를 즉시 검출하여 표시해 주므로써, 고장진단의 세분화를 꾀할 수 있고, 또 안전운행에 도움을 줄 수 있음은 물론 연비를 대폭 향상시킬 수 있는 등 매우 유용한 발명인 것이다.As described above, according to the present invention, when an opening occurs in any one of the several injectors, it is immediately detected and displayed, so that failure diagnosis can be subdivided, and it can also help safe operation. It is a very useful invention such that it can greatly improve.

Claims (1)

자동차의 주행 중 엔진 콘트롤 유니트(1)에서 퓨얼 컷 검출부(2)를 통해 현재 엔진의 상태가 퓨얼 컷 상태인지를 계속해서 검출하는 단계와;Continuously detecting whether the current engine is in the fuel cut state through the fuel cut detector 2 in the engine control unit 1 while the vehicle is being driven; 상기에서 검출한 결과 자동차의 주행중 엔진이 퓨얼 컷 상태이면 인젝터 구동부(3)에 차단신호를 출력시켜 엔진(7)에 설치되어 있는 인젝터(8)의 인젝션을 금지시킨 후 산소센서(4)의 출력전압을 검출하여 퓨얼 컷으로 인한 상한치(X V)인지를 검출하는 단계와;As a result of detection as described above, if the engine is in the fuel cut state while driving the vehicle, a shutoff signal is output to the injector driver 3 to prohibit the injection of the injector 8 installed in the engine 7, and then the output of the oxygen sensor 4. Detecting a voltage to detect whether an upper limit due to a fuel cut is XV; 상기에서 검출한 결과 현재 엔진의 상태가 퓨얼 컷 상태가 아니거나, 산소센서(4)의 출력값이 퓨얼 컷으로 인한 상한치(X V)가 아니면 인젝터 누유 모니터링 검지영역으로 판별하는 단계와;If the current engine state is not a fuel cut state or the output value of the oxygen sensor 4 is not the upper limit value XV due to the fuel cut, the injector oil leakage monitoring detection area is detected; 상기에서 검출한 결과 산소센서(4)의 출력전압이 퓨얼 컷으로 인한 상한치(X V) 이상이면 인젝터 누유 모니터링을 타이머(5)에 의해 설정된 시간(T1) 만큼 금지시킨 다음 그 시간이 경과되면 인젝터 누유 모니터링을 실시한 후, 다시 산소센서(4)의 출력전압을 검출하여 상한치(X V) 이하에서의 소정전압(Y V) 이하가 정해진 시간(T2) 이상 지속되는지를 검출하는 단계와;As a result of the above detection, if the output voltage of the oxygen sensor 4 is equal to or higher than the upper limit value XV due to the fuel cut, the injector leakage monitoring is prohibited by the time T1 set by the timer 5, and when the time elapses, the injector leakage After monitoring, detecting the output voltage of the oxygen sensor 4 again to detect whether or not the predetermined voltage YV below the upper limit value XV is longer than the predetermined time T2; 상기에서 검출한 결과, 산소센서(4)의 출력전압이 상한치(X V) 이하에서의 소정전압(Y V) 이하가 정해진 시간(T2) 이상 지속되지 않으면 인젝터(8)가 정상임으로 판정하고, 지속되면 인젝터에서 누유가 일어난 것으로 판정하고 표시램프(6)를 점등시키는 단계;로 이루어진 것을 특징으로 하는 주행중 퓨얼 컷 작동시 인젝터 고장 판단방법.As a result of the detection above, if the output voltage of the oxygen sensor 4 is not lower than the predetermined voltage YV below the upper limit value XV or longer than the predetermined time T2, it is determined that the injector 8 is normal, and if it is continued And determining that leakage has occurred in the injector, and lighting the display lamp (6).
KR10-2001-0041336A 2001-07-10 2001-07-10 Injector disorder determining method in travelling the vehicle KR100418617B1 (en)

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CN107178429A (en) * 2016-03-09 2017-09-19 福特环球技术公司 Method and system for adjusting sensor and actuator during engine fuel closing situation
CN111237110A (en) * 2020-03-27 2020-06-05 潍柴动力股份有限公司 Method and device for detecting internal leakage of engine injection valve

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KR101923277B1 (en) * 2016-12-13 2018-11-28 주식회사 현대케피코 Method for distinguishing the reason of misfire

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JPH07116969B2 (en) * 1986-08-18 1995-12-18 日産自動車株式会社 Fuel supply system failure diagnosis device
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KR100272693B1 (en) * 1996-12-23 2000-11-15 정몽규 Malfunction determining method for fuel injector

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107178429A (en) * 2016-03-09 2017-09-19 福特环球技术公司 Method and system for adjusting sensor and actuator during engine fuel closing situation
CN111237110A (en) * 2020-03-27 2020-06-05 潍柴动力股份有限公司 Method and device for detecting internal leakage of engine injection valve

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