EP1201905B1 - A device for detecting failure in a high pressure fuel supply system - Google Patents

A device for detecting failure in a high pressure fuel supply system Download PDF

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Publication number
EP1201905B1
EP1201905B1 EP20010125541 EP01125541A EP1201905B1 EP 1201905 B1 EP1201905 B1 EP 1201905B1 EP 20010125541 EP20010125541 EP 20010125541 EP 01125541 A EP01125541 A EP 01125541A EP 1201905 B1 EP1201905 B1 EP 1201905B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
accumulating chamber
pump
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20010125541
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1201905A3 (en
EP1201905A2 (en
Inventor
Motoichi Murakami
Tatsumasa Sugiyama
Eiji c/o Intellectual Property Center Takemoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Toyota Motor Corp
Original Assignee
Denso Corp
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp, Toyota Motor Corp filed Critical Denso Corp
Publication of EP1201905A2 publication Critical patent/EP1201905A2/en
Publication of EP1201905A3 publication Critical patent/EP1201905A3/en
Application granted granted Critical
Publication of EP1201905B1 publication Critical patent/EP1201905B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • 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
    • 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
    • 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

Definitions

  • the amount of fuel supplied to the common-rail 3 can be controlled precisely.
  • the suction-regulating type control of the fuel pump 5 as described above, the supply of fuel to the common-rail 3 is stopped after the supply (discharge) stroke of the fuel pump starts for a period determined by the amount of fuel to be supplied to the common-rail 3.
  • the judging period for measuring the change in the pressure in the common-rail 3 is started simultaneously with the start of the supply stroke of the fuel pump 5 as shown in Fig. 2 (point a), in order to increase the probability that the measuring of the change in the pressure is carried out during the stop period in the former half of the supply stroke.
  • the magnitude QL of leakage is expressed by the amount of fuel leaking from the common-rail in a unit time.
  • the accuracy D of pressure detection of the pressure sensor 31 remains constant and, hence, the magnitude of leakage that can be detected by the pressure sensor 31 decreases in reverse proportion to the length T of the judging period. That is, the leakage detection error QL1 based on the accuracy of detection of the pressure sensor 31 decreases with an increase in the judging period, i.e., decreases as the timing (point b) for ending the judging period of Fig. 2 is delayed.
  • a maximum possible value of the amount of fuel flowing into the common-rail during the judging period is used for the expected value of Q in order to set the judging period in such a manner that the detection error QE is as small as possible even when the amount of fuel flowing into the common-rail becomes the maximum.
  • This embodiment is different from the above-mentioned embodiment only with regard to the calculation of the expected value Q of the amount of fuel flowing into the common-rail during the judging period, that serves as a basis for setting the judging period TCA.
  • This embodiment is the same as the above embodiment in regard to other respects.
  • the geometrical discharge amount of the fuel pump 5 during the full supply state in which Q becomes a maximum is used for the expected value Q.
  • the fuel pump 5 is operated in the full supply state only under particular conditions such as when the engine load is very high. Usually, therefore, the fuel pump is rarely operated in the full supply state.
  • the expected value Q is determined taking into consideration the probability of the occurrence of the start of the effective supply stroke at the respective point in the supply stroke of the fuel pump. By considering the probability of occurrence of the start of the effective supply stroke, the accuracy of the expected value Q is increased.
  • Fig. 4A is a diagram schematically illustrating a change in the geometrical fuel supply rate (amount of fuel discharged from the fuel pump per a unit rotational angle of the crank) during the supply stroke of a cylinder of the fuel pump 5, wherein the vertical axis represents the rate of fuel supply and the horizontal axis (x-axis) represents the crank angle.
  • the horizontal axis represents the start of the geometrical supply stroke of the cylinder (bottom dead center of the plunger) and S represents the end of the geometrical supply stroke (top dead center of the plunger).
  • QG(x) becomes equal to the area of the hatched region in Fig. 4A. Therefore, if the crank angle at the end (point b in Fig. 2) of the judging period is denoted by XB, the amount of fuel flowing into the common-rail during the judging period is denoted by QG(XB) when the fuel pump is in the full supply state.
  • Fig. 4B illustrates a change, depending upon the crank angle x, of the value of the probability density function F(x) representing the probability of start of the effective supply stroke at a moment of crank angle x during the supply stroke of the cylinder.
  • the value of the probability density function F(x) is found by operating the engine while changing the load and the rotational speed in a manner of actual operation, by measuring the number of times of the start of the effective supply stroke at the individual crank angles, and by dividing the number of times by the total number of times of measurement.
  • the probability density function becomes a smaller value as the crank angle x becomes smaller, i.e., as the crank angle X approaches the starting point of the supply stroke and, becomes the greatest value near the center of the supply stroke, and becomes smaller as the crank angle x approaches the ending point of the supply stroke.
  • Q(x) obtained by the above formula is the amount of fuel that flows in when the effective supply stroke starts at the crank angle x.
  • the accuracy of leakage detection is further improved.
  • a further statement of invention is that fuel of a high pressure is supplied from a high-pressure fuel injection pump 5 into a common-rail 3, and is, then, supplied to the fuel injection valves 1 from the common-rail.
  • a control circuit (ECU) 20 compares a change in the fuel pressure in the common-rail detected by a fuel pressure sensor 31 during a judging period with an estimated value of change in the pressure during the judging period to judge the leakage of fuel from the common-rail.
  • the judging period is set to take place in a period in which it is estimated that the fuel flows in the least amount into a pressure-accumulating chamber in the former half or in the latter half of the fuel supply stroke of the fuel pump. This minimizes the effect of fuel flowing into the common-rail, and improves the accuracy of leakage detection.

Landscapes

  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20010125541 2000-10-27 2001-10-25 A device for detecting failure in a high pressure fuel supply system Expired - Lifetime EP1201905B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000329448A JP3798615B2 (ja) 2000-10-27 2000-10-27 高圧燃料供給系の異常検出装置
JP2000329448 2000-10-27

Publications (3)

Publication Number Publication Date
EP1201905A2 EP1201905A2 (en) 2002-05-02
EP1201905A3 EP1201905A3 (en) 2003-09-24
EP1201905B1 true EP1201905B1 (en) 2005-12-14

Family

ID=18806113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010125541 Expired - Lifetime EP1201905B1 (en) 2000-10-27 2001-10-25 A device for detecting failure in a high pressure fuel supply system

Country Status (4)

Country Link
EP (1) EP1201905B1 (ja)
JP (1) JP3798615B2 (ja)
DE (1) DE60115812T2 (ja)
ES (1) ES2252131T3 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120245819A1 (en) * 2011-03-25 2012-09-27 Continental Automotive Gmbh Method For Monitoring An Electromotively Driven Fuel Pump And Fuel Feed Unit Having A Fuel Pump

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4096652B2 (ja) * 2002-07-30 2008-06-04 三菱ふそうトラック・バス株式会社 増圧型燃料噴射装置
DE10348610B4 (de) * 2003-10-20 2009-07-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Überwachen eines Kraftstoffdrucksensors
DE102004055575A1 (de) 2004-11-18 2006-05-24 Robert Bosch Gmbh Verfahren und Vorrichtung zur Leckageprüfung eines Kraftstoffeinspritzventils einer Brennkraftmaschine
JP2006291755A (ja) 2005-04-06 2006-10-26 Denso Corp 燃料噴射制御装置
JP4595854B2 (ja) * 2006-03-22 2010-12-08 株式会社デンソー 燃料噴射装置
KR101180800B1 (ko) 2006-12-11 2012-09-10 현대자동차주식회사 커먼레일 연료분사 시스템의 인젝터 연료누출 진단 방법
GB2449706A (en) * 2007-06-01 2008-12-03 Scania Cv Ab Identifying a Malfunctioning Fuel Injector
JP5353670B2 (ja) * 2009-12-07 2013-11-27 株式会社デンソー 燃料噴射制御装置
DE102010027675B4 (de) * 2010-07-20 2013-07-18 Continental Automotive Gmbh Verfahren zur Erkennung fehlerhafter Komponenten oder fehlerhafter Teilsysteme eines elektronisch geregelten Kraftstoffeinspritzsystems eines Verbrennungsmotors durch Evaluierung des Druckverhaltens
DE102014214033A1 (de) * 2014-07-18 2016-01-21 Ksb Aktiengesellschaft Bestimmung des Förderstroms einer Pumpe
DE102016225435B3 (de) * 2016-12-19 2018-02-15 Continental Automotive Gmbh Verfahren zum Betreiben einer Brennkraftmaschine mit Kraftstofferkennung
CN107255052B (zh) * 2017-07-04 2019-08-13 潍柴西港新能源动力有限公司 燃气发动机喷射装置泄露监测策略
CN109113882B (zh) * 2018-08-27 2020-08-18 车行天下网络科技股份有限公司 一种柴油车发动机传感器智能数据优化装置
CN111237072B (zh) * 2020-03-27 2022-08-05 潍柴动力股份有限公司 一种电控柴油机喷嘴故障识别方法、系统及电子控制单元
CN111765014B (zh) * 2020-06-30 2022-10-25 潍柴重机股份有限公司 一种高压燃油系统泄漏的监控方法及系统
CN115126637B (zh) * 2022-07-20 2024-02-20 潍柴动力股份有限公司 一种高压共轨燃油系统及汽车

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3796912B2 (ja) 1997-02-21 2006-07-12 トヨタ自動車株式会社 内燃機関の燃料噴射装置
JP3855471B2 (ja) * 1998-07-01 2006-12-13 いすゞ自動車株式会社 コモンレール式燃料噴射装置
JP2000265896A (ja) * 1999-03-17 2000-09-26 Toyota Motor Corp 高圧燃料噴射装置の異常判定方法
JP4158272B2 (ja) * 1999-03-26 2008-10-01 トヨタ自動車株式会社 高圧燃料噴射系の異常判定方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120245819A1 (en) * 2011-03-25 2012-09-27 Continental Automotive Gmbh Method For Monitoring An Electromotively Driven Fuel Pump And Fuel Feed Unit Having A Fuel Pump
US9127611B2 (en) * 2011-03-25 2015-09-08 Continental Automotive Gmbh Method for monitoring an electromotively driven fuel pump and fuel feed unit having a fuel pump

Also Published As

Publication number Publication date
EP1201905A3 (en) 2003-09-24
EP1201905A2 (en) 2002-05-02
JP3798615B2 (ja) 2006-07-19
ES2252131T3 (es) 2006-05-16
DE60115812D1 (de) 2006-01-19
JP2002130023A (ja) 2002-05-09
DE60115812T2 (de) 2006-08-10

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