KR100667396B1 - Error diagnosis method of fuel pressure sensor for lpi engine - Google Patents

Error diagnosis method of fuel pressure sensor for lpi engine Download PDF

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KR100667396B1
KR100667396B1 KR1020050094894A KR20050094894A KR100667396B1 KR 100667396 B1 KR100667396 B1 KR 100667396B1 KR 1020050094894 A KR1020050094894 A KR 1020050094894A KR 20050094894 A KR20050094894 A KR 20050094894A KR 100667396 B1 KR100667396 B1 KR 100667396B1
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pressure sensor
fuel pressure
engine
fuel
satisfied
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KR1020050094894A
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Korean (ko)
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정재윤
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An error diagnosis method of a fuel pressure sensor for a liquefied petroleum gas injection engine is provided to diagnose malfunction of the fuel pressure sensor to prevent degradation of a discharge gas and output reduction. An error diagnosis method of a fuel pressure sensor for a liquefied petroleum gas injection engine includes the steps of determining whether an engine is OFF in a state that an ignition switch is ON(S1), determining whether a difference between a temperature of the last cooling water and the current temperature of cooling water when the engine is stopped is higher than a predetermined temperature when the step(S1) is satisfied(S2), determining whether a difference between a measurement value of the fuel pressure sensor and a measurement value of an ambient pressure sensor is higher than a reference pressure when the step(S2) is satisfied(S3), and displaying that the fuel pressure sensor is out of order when the step(S3) is satisfied(S4).

Description

ＬＰＩ 엔진의 연료압력센서 고장 진단방법{ERROR DIAGNOSIS METHOD OF FUEL PRESSURE SENSOR FOR LPI ENGINE}ERROR DIAGNOSIS METHOD OF FUEL PRESSURE SENSOR FOR LPI ENGINE}

도 1은 본 발명에 따른 연료압력센서 고장 진단방법이 적용된 LPI 엔진의 제어 블럭도이고,1 is a control block diagram of an LPI engine to which a fuel pressure sensor failure diagnosis method according to the present invention is applied;

도 2는 본 발명에 따른 LPI 엔진의 연료압력센서의 고장을 진단하기 위한 제어 흐름도이고, 2 is a control flowchart for diagnosing a failure of a fuel pressure sensor of an LPI engine according to the present invention;

도 3은 각 환경에 따른 종래의 연료압력센서의 압력 - 전압을 나타낸 그래프이다. 3 is a graph showing the pressure-voltage of a conventional fuel pressure sensor according to each environment.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

10 : 대기압센서 20 : 연료압력센서10: atmospheric pressure sensor 20: fuel pressure sensor

30 : 냉각수온센서 60 : 제어부30: cooling water temperature sensor 60: control unit

70 : 표시부70: display unit

본 발명은, LPI 엔진의 연료압력센서 고장 진단방법에 관한 것으로서, 보다 상세하게는, 연료압력센서의 특성이 왜곡된 경우를 감지하여 연료압력센서의 고장 을 진단할 수 있는 LPI 엔진의 연료압력센서 고장 진단방법에 관한 것이다.The present invention relates to a method of diagnosing a failure of a fuel pressure sensor of an LPI engine, and more particularly, a fuel pressure sensor of an LPI engine capable of diagnosing a failure of a fuel pressure sensor by detecting a case where a characteristic of a fuel pressure sensor is distorted. It relates to a failure diagnosis method.

LPI 엔진은 LPG 연료를 고압 액상화시켜 ECU(Electronic Control Unit, 전자제어유닛)의 제어로 인젝터를 통해 각 기통별로 연료를 분사하는 방식으로서, 액화상태의 LPG를 기존의 가솔린 MPI 엔진(3 bar)에 비해 비교적 고압(5~15 bar)으로 분사시키므로 연료압력센서를 통해 검출되는 연료압력이 실제압력과 다른 경우, 연료조성비 및 분사연료량 등에 악영향을 미칠 수 있다. 즉, 연료압력센서가 오작동이 되는 경우 출력저하, 엔진부조, 시동불량, 배출가스 악화 등의 문제점이 발생할 수 있다. The LPI engine is a method of injecting fuel into each cylinder through an injector under the control of an ECU (Electronic Control Unit (ECU)) by liquefying LPG fuel at high pressure. Compared with the high pressure (5 to 15 bar), the fuel pressure detected by the fuel pressure sensor is different from the actual pressure, which may adversely affect the fuel composition ratio and the injected fuel amount. That is, when the fuel pressure sensor malfunctions, problems such as output reduction, engine assistance, starting failure, and deterioration of exhaust gas may occur.

일반적으로 연료압력센서는 LPG 액상 연료의 압력을 측정하여 ECU가 인젝터 분사량을 제어하는데 필요한 장치이다. 이러한 연료압력센서는 피에조 소자를 구비하여, 피에조 소자에 가해진 LPG 연료의 압력이 회로에 의해 전압으로 변화되고 이 결과를 ECU로 신호를 송신하는 원리로 이루어진다. 이 때, 출력값은 도 3에 도시된 바와 같이 선형적으로 나타나게 된다. In general, the fuel pressure sensor measures the pressure of the LPG liquid fuel and is necessary for the ECU to control the injector injection amount. Such a fuel pressure sensor is provided with a piezo element, and the pressure of the LPG fuel applied to the piezo element is changed into a voltage by the circuit and the result is made on the principle of transmitting a signal to the ECU. At this time, the output value is shown linearly as shown in FIG.

여기서, 종래의 연료압력센서가 정상인 경우의 출력값은 G0와 같이 나타나는데, 내부 회로가 단락 또는 단선되는 경우는 각각 G1, G2과 같이 측정된다. 즉, 연료압력센서의 내부 회로가 단락(short)되는 경우는 실제 압력(일 예로, 5 bar일 때)에서 측정된 전압(a)에 비해 높게 출력되고(G1의 점 b), 단선되는 경우는 실제 압력(일 예로, 5 bar일 때)에서 측정된 전압(a)에 비해 낮게 출력된다(G2의 점 c). 따라서, 이러한 전압 출력값의 고/저 변화에 따라 연료압력센서의 단락 또는 단선여 부를 판정할 수 있다. Here, the output value when the conventional fuel pressure sensor is normal appears as G 0 , but when the internal circuit is shorted or disconnected, it is measured as G 1 and G 2 , respectively. That is, when the internal circuit of the fuel pressure sensor is shorted, it is output higher than the voltage (a) measured at the actual pressure (for example, 5 bar) (point b of G 1 ) and is disconnected. Is output lower than the voltage (a) measured at the actual pressure (eg 5 bar) (point c of G 2 ). Therefore, it is possible to determine whether the fuel pressure sensor is shorted or disconnected according to the high / low change in the voltage output value.

그런데, 이러한 종래의 연료압력센서에 있어서는, 내부 회로의 단락 또는 단선된 경우의 고장판정은 가능하지만, 센서 특성이 왜곡된 경우(일 예로, 노후되는 경우나, 진동 등에 의해 미세하게 또는 급격하게 신호가 변화되는 경우 등)를 판단할 수 없는 문제점이 있다. By the way, in such a conventional fuel pressure sensor, failure determination in the case of short circuit or disconnection of an internal circuit is possible, but when the sensor characteristic is distorted (for example, when it is aging, vibration, etc., the signal is minute or abruptly. Is changed, etc.) there is a problem that can not be determined.

따라서, 본 발명의 목적은, 연료압력센서의 특성이 왜곡된 경우를 판단하여 연료압력센서의 고장을 진단할 수 있는 LPI 엔진의 연료압력센서 고장 진단방법을 제공하는 것이다. Accordingly, an object of the present invention is to provide a method for diagnosing a failure of a fuel pressure sensor of an LPI engine capable of diagnosing a failure of a fuel pressure sensor by determining a case where a characteristic of a fuel pressure sensor is distorted.

상기 목적은, 본 발명에 따라, LPI 엔진의 연료압력센서 고장 진단방법에 있어서, (a) 이그니션 스위치가 온(on)상태에서 시동이 오프(off)인지를 판단하는 단계와; (b) 상기 (a)단계가 만족되면, 엔진회전수가 소정 회전수 이하이고, 시동이 온(on)일 때 저장된 마지막 냉각수온과 시동이 오프(off)일 때 현재 냉각수온의 차이가 소정 온도 이상인지를 판단하는 단계와; (c) 상기 (b)단계가 만족되면, 연료압력센서의 측정치와 대기압센서의 측정치의 차이가 기준압력 이상인지를 판단하는 단계와; (d) 상기 (c)단계가 만족되면, 상기 연료압력센서가 고장임을 표시하는 단계에 의해 달성된다.According to the present invention, there is provided a method for diagnosing a failure of a fuel pressure sensor of an LPI engine, the method comprising: (a) determining whether an ignition is turned off when an ignition switch is on; (b) If step (a) is satisfied, the difference between the last coolant temperature stored when the engine speed is less than the predetermined speed and the start is on and the current coolant temperature when the start is off is a predetermined temperature. Determining whether it is abnormal; (c) if step (b) is satisfied, determining whether a difference between the measured value of the fuel pressure sensor and the measured value of the atmospheric pressure sensor is greater than or equal to the reference pressure; (d) If step (c) is satisfied, this is accomplished by indicating that the fuel pressure sensor is faulty.

여기서, 상기 (c)단계의 기준압력은 대략 0.3 ~ 0.4 바(bar)인 것이 바람직하다.Here, the reference pressure in the step (c) is preferably about 0.3 ~ 0.4 bar (bar).

이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 연료압력센서 고장 진단방법이 적용된 LPI 엔진의 제어 블록도이다. 본 발명에 따른 연료압력센서 고장을 진단하는 LPI 엔진은 이그니션 스위치(40)와, 엔진회전수를 측정하는 크랭크각 센서(50)와, 대기압을 감지하는 대기압센서(10)와, 연료탱크에서 엔진의 인젝터로 토출되는 연료의 압력을 감지하는 연료압력센서(20)와, 과열된 엔진을 냉각하기 위한 냉각수의 온도를 측정하는 냉각수온센서(30)와, 상기 각 센서(10, 20, 30, 40, 50)들로부터의 신호를 입력받아 연료압력센서(20)의 고장을 진단하여 계기판 또는 스피커 등과 같은 표시부(70)에 신호를 출력하는 제어부(60)를 포함하여 이루어진다. 1 is a control block diagram of an LPI engine to which a fuel pressure sensor failure diagnosis method according to the present invention is applied. The LPI engine for diagnosing a fuel pressure sensor failure according to the present invention includes an ignition switch 40, a crank angle sensor 50 for measuring engine speed, an atmospheric pressure sensor 10 for detecting atmospheric pressure, and an engine in a fuel tank. A fuel pressure sensor 20 for detecting a pressure of the fuel discharged to the injector, a coolant temperature sensor 30 for measuring the temperature of the coolant for cooling the overheated engine, and the sensors 10, 20, 30, And a controller 60 which receives signals from the 40 and 50, diagnoses the failure of the fuel pressure sensor 20, and outputs a signal to the display unit 70 such as an instrument panel or a speaker.

연료압력센서(20)는 LPG 액상 연료의 압력을 측정하여 제어부(60)가 인젝터 분사량을 제어하는데 필요한 장치이다. 일반적으로 연료압력센서(20)는 피에조 소자를 구비하여, 피에조 소자에 가해진 LPG 연료의 압력이 회로에 의해 전압으로 변화되고 이 결과를 제어부(60)로 송신하는 원리로 이루어진다. 이 때, 연료압력센서(20)로부터 출력된 전압은 LPG 연료의 압력에 비례하여 리니어(linear)하게 나타난다. 여기서, 연료압력센서(20)가 오작동이 되는 경우 출력저하, 엔진부조, 시동불량, 배출가스 악화 등의 문제점이 발생할 수 있으므로 이에 대한 고장을 진단하는 방법이 중요하다. 특히, 본 발명은 연료압력센서(20)가 노후되거나, 진동 등에 의해 미세하게 또는 급격하게 신호가 변화되는 등 특성이 왜곡된 경우에 대한 고장을 진단하는 점에 특징이 있다. The fuel pressure sensor 20 is a device required to control the injector injection amount by the controller 60 by measuring the pressure of the LPG liquid fuel. In general, the fuel pressure sensor 20 includes a piezo element, and the pressure of the LPG fuel applied to the piezo element is changed into a voltage by a circuit and transmits the result to the controller 60. At this time, the voltage output from the fuel pressure sensor 20 appears to be linear in proportion to the pressure of the LPG fuel. In this case, when the fuel pressure sensor 20 malfunctions, problems such as a decrease in output, engine assistance, poor starting, deterioration of exhaust gas, and the like may occur. In particular, the present invention is characterized by diagnosing a failure in the case where the fuel pressure sensor 20 is distorted, such as when the fuel pressure sensor 20 is aged or the signal is minutely or suddenly changed due to vibration or the like.

이러한 구성에 의하여, 본 발명에 따른 LPI 엔진의 연료압력센서(20)의 고장 을 진단하기 위한 제어 흐름을 도 2를 참조하여 설명하면 다음과 같다. By such a configuration, a control flow for diagnosing a failure of the fuel pressure sensor 20 of the LPI engine according to the present invention will be described with reference to FIG. 2.

먼저, 이그니션 스위치(40)가 온(on) 상태에서 시동이 오프(off)인지를 판단하여(S1), 상기 (S1) 조건이 만족하면 크랭크각 센서(50)에서 측정된 엔진회전수가 소정 회전수(N) 이하인지와 차량이 충분히 오랫동안 방치되었는지를 판단한다(S2). 가령, 상기 (S2)단계에서 엔진회전수가 대략 100rpm(크랭킹을 시도하기 전의 엔진회전수를 의미함)이하인지를 판단한다. 한편, 차량이 충분히 오래 방치되었는지 판단하기 위해서는, 시동이 온(on)일 때 마지막으로 저장된 냉각수온과 현재 시동이 오프(off)일 때의 냉각수온 차이가 소정 온도(T0) 이상인지를 판단하면 된다. 예를 들면, 운전자가 시동을 걸고 일정시간 이상 주행을 지속한 경우에는 엔진 연소열의 열전달에 의해 냉각수온이 상승하게 되고, 시동을 끈 경우에는 공기에 의한 냉각에 의해 냉각수온이 서서히 떨어지게 되어 시동을 건 상태의 고온의 냉각수온에 비해 계속 낮아지게 된다. 따라서, 시동을 건 상태에서 마지막으로 저장되었던 고온의 냉각수온에 비해 시동을 끈 상태에서 냉각수온이 소정 온도(T0) 이상 떨어진 경우에는 차량을 대기 중에 충분히 오랫동안 방치한 것으로 간주할 수 있는 것이다. First, when the ignition switch 40 is on, it is determined whether the starting is off (S1), and when the condition (S1) is satisfied, the engine speed measured by the crank angle sensor 50 is rotated by a predetermined rotation. It is determined whether the number N or less and whether the vehicle has been left long enough (S2). For example, in the step (S2) it is determined whether the engine speed is less than about 100rpm (meaning the engine speed before attempting cranking). On the other hand, in order to determine whether the vehicle has been left long enough, it is determined whether the difference between the last stored coolant temperature when the startup is on and the coolant temperature when the current startup is off is greater than or equal to the predetermined temperature T 0 . Just do it. For example, when the driver starts the engine and continues driving for a predetermined time, the coolant temperature rises due to heat transfer of the engine combustion heat, and when the driver is turned off, the coolant temperature gradually decreases due to air cooling. It is continuously lowered compared to the cool water temperature of the dry state. Therefore, when the cooling water temperature drops more than a predetermined temperature T 0 while the starting is turned off, the vehicle may be regarded as being left in the air for a long time.

다음, 상기 (S2)단계의 조건을 모두 만족하면, 연료압력센서(20)의 값과 대기압센서(10)의 값을 비교하여 기준압력(P0) 이상인지를 판단하여(S3), 그 값의 차이가 기준압력(P0)을 초과하면 연료압력센서(20)의 특성이 왜곡된 상태인 것으로 판단하여 고장 신호를 표시부(70)에 출력한다(S4). 즉, 상기 (S1)(S2) 조건인 경우에는 냉각수온의 자연냉각과 동시에 시동을 끈 상태에서 연료탱크와 엔진 간의 연료 라인 자체의 미세한 누유량에 의해 압력이 서서히 줄어들게 되고, 최종적으로 대기압과 거의 동일 수준까지 연료압력이 감소하여야 한다. 그러나, 연료압력센서(20)의 특성이 왜곡된 경우에는 상기 (S1)(S2) 조건에서 연료압력이 높게 측정되어 대기압 간의 차이가 기준압력(P0)에 비해 크게 측정이 되는 것이다. 여기서, 기준압력(P0)은 대략 0.3 ~ 0.4바(bar) 정도로 설정된다. Next, when all of the conditions of the step (S2) is satisfied, by comparing the value of the fuel pressure sensor 20 and the value of the atmospheric pressure sensor 10 to determine whether the reference pressure (P 0 ) or more (S3), the value When the difference exceeds the reference pressure P 0 , it is determined that the characteristics of the fuel pressure sensor 20 are distorted, and a failure signal is output to the display unit 70 (S4). That is, in the condition of (S1) (S2), the pressure gradually decreases due to the minute leakage of the fuel line itself between the fuel tank and the engine while the engine is turned off simultaneously with the natural cooling of the cooling water temperature. The fuel pressure should be reduced to the same level. However, when the characteristic of the fuel pressure sensor 20 is distorted, the fuel pressure is measured under the conditions (S1) and (S2) so that the difference between the atmospheric pressures is larger than the reference pressure P 0 . Here, the reference pressure P 0 is set to about 0.3 to 0.4 bar.

한편, 상기 (S3) 단계의 각 센서(10, 20) 값의 차이가 기준압력(P0) 미만이면 연료압력센서(20)에 이상이 없는 정상상태로 판단하여 로직을 종료시킨다. On the other hand, if the difference between the values of the respective sensors (10, 20) in the step (S3) is less than the reference pressure (P 0 ) it is determined that the normal state without abnormality in the fuel pressure sensor 20 to terminate the logic.

상기 로직에 의해 연료압력센서(20)의 왜곡 상태를 쉽게 인지할 수 있으므로, 배출가스 악화, 출력저하, 엔진부조 등의 문제를 사전에 방지할 수 있게 된다. Since the distortion state of the fuel pressure sensor 20 can be easily recognized by the logic, it is possible to prevent problems such as exhaust gas deterioration, output reduction, engine assistance, and the like in advance.

이상 설명한 바와 같이, 본 발명에 따르면, 연료압력센서의 특성이 왜곡된 경우를 판단하여 연료압력센서의 고장을 진단함으로써, 배출가스 악화, 출력저하, 엔진부조 등의 문제를 사전에 방지할 수 있는 LPI 엔진의 연료압력센서 고장 진단방법을 제공한다. As described above, according to the present invention, by diagnosing the failure of the fuel pressure sensor by determining the case where the characteristics of the fuel pressure sensor is distorted, it is possible to prevent problems such as exhaust gas deterioration, output reduction, engine assistance, etc. in advance. It provides a method for diagnosing the failure of the fuel pressure sensor of the LPI engine.

Claims (2)

(a) 이그니션 스위치가 온(on)상태에서 시동이 오프(off)인지를 판단하는 단계와;(a) determining whether the ignition is off when the ignition switch is on; (b) 상기 (a)단계가 만족되면, 엔진회전수가 소정 회전수 이하이고, 시동이 온(on)일 때 저장된 마지막 냉각수온과 시동이 오프(off)일 때 현재 냉각수온의 차이가 소정 온도 이상인지를 판단하는 단계와;(b) If step (a) is satisfied, the difference between the last coolant temperature stored when the engine speed is less than the predetermined speed and the start is on and the current coolant temperature when the start is off is a predetermined temperature. Determining whether it is abnormal; (c) 상기 (b)단계가 만족되면, 연료압력센서의 측정치와 대기압센서의 측정치의 차이가 기준압력 이상인지를 판단하는 단계와; (c) if step (b) is satisfied, determining whether a difference between the measured value of the fuel pressure sensor and the measured value of the atmospheric pressure sensor is greater than or equal to the reference pressure; (d) 상기 (c)단계가 만족되면, 상기 연료압력센서가 고장임을 표시하는 단계를 포함하는 것을 특징으로 하는 LPI 엔진의 연료압력센서 고장 진단방법 .(d) if the step (c) is satisfied, the fuel pressure sensor failure diagnosis method comprising the step of indicating that the fuel pressure sensor failure. 제1항에 있어서,The method of claim 1, 상기 (c)단계의 기준압력은 대략 0.3 ~ 0.4 바(bar)인 것을 특징으로 하는 LPI 엔진의 연료압력센서 고장 진단방법. The reference pressure in the step (c) is about 0.3 ~ 0.4 bar (bar), the fuel pressure sensor failure diagnosis method of the LPI engine.
KR1020050094894A 2005-10-10 2005-10-10 Error diagnosis method of fuel pressure sensor for lpi engine KR100667396B1 (en)

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