EP0819213B1 - Einrichtung zur erkennung eines lecks in einem kraftstoffversorgungssystem - Google Patents
Einrichtung zur erkennung eines lecks in einem kraftstoffversorgungssystem Download PDFInfo
- Publication number
- EP0819213B1 EP0819213B1 EP96902879A EP96902879A EP0819213B1 EP 0819213 B1 EP0819213 B1 EP 0819213B1 EP 96902879 A EP96902879 A EP 96902879A EP 96902879 A EP96902879 A EP 96902879A EP 0819213 B1 EP0819213 B1 EP 0819213B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure
- control unit
- leak
- supply system
- 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
Links
- 239000000446 fuel Substances 0.000 claims abstract description 90
- 238000001514 detection method Methods 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 239000002828 fuel tank Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/088—Safety, indicating, or supervising devices relating to tightness
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
-
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/18—Detecting fluid leaks
Definitions
- the invention is based on a device for detection a leak in a fuel supply system at one Internal combustion engine according to the type of the main claim (see e.g. JP-A-4 350 358).
- the Fuel with the help of an electric fuel pump from the Fuel tank promoted and via fuel lines fed to the injectors. Excess fuel usually gets into the via a return line Fuel tank back. So that is always sufficient Amount of fuel available is the fuel conveyed by the electric fuel pump with an overpressure, the electric fuel pump is regulated in a suitable manner, for example by the fuel pressure is measured and used for evaluation.
- DE-OS 40 40 896 or Device for checking the tightness of a tank ventilation system it is checked whether after opening the tank ventilation valve the negative pressure building up in the tank the predicted way changes. To do this, the entire facility monitored for functionality and there is a Assessment of the system as not working if the Vacuum build-up gradient below a predefinable threshold lies.
- the inventive device with the features of Main claim has the advantage that the entire Fuel supply system to be monitored for leaks can.
- the simplicity of the invention is particularly advantageous Facility that most conventional Fuel supply systems without the use of complex additional Components can be used.
- This advantage is achieved by using a pressure sensor the fuel pressure is measured and after switching off the electric fuel pump is checked whether the excess pressure in the fuel supply system in a predetermined Way changes. If not, you can immediately can be detected that a leak or a leak in the fuel supply system is available.
- the leak detection can advantageously also with special Operating conditions of the internal combustion engine take place, for example if the control unit detects an engine overrun phase, in which the engine during the fuel cut-off Injectors are no longer supplied with fuel. The electric fuel pump is then activated during overrun fuel cut-off switched off and then the leak diagnosis is carried out.
- Leak diagnosis during overrun operation has the advantages that it can be done more often, that during a trip is repeatable and that to carry out the Diagnosis no control unit overrun is required.
- the Fuel tank designated 10 in the fuel tank is the fuel pump 11, usually one Electric fuel pump and a check valve 12, the is integrated into the fuel pump 11, for example.
- the flow 13 leads from the fuel pump 11 to the fuel Distributor 14 through which the fuel to the injectors 15 is supplied.
- the regulation of the fuel pressure takes place with the help of the pressure regulator 16, which is used in a fuel supply system with a fuel return line or return 17 via the return 17 and, if appropriate a pressure maintaining valve 18 with the fuel tank 10 in Connection is established and possibly via a connection 28 with the intake manifold of the internal combustion engine.
- the fuel tank 10 is via a line 19, in which a vent valve 20 is located connected to the intake manifold 21 of the internal combustion engine. Between the fuel tank 10 and the vent valve 20 still an adsorption filter 22 in which the fuel vapors to be caught.
- Control unit 23 This is used to control or regulate the internal combustion engine Control unit 23 to which the required sizes are supplied or which emits the required control signals.
- Control unit perform the necessary calculations.
- the Leakage detection according to the invention is also in the control unit performed.
- a pressure sensor 24 is shown, the pressure p of the Fuel in the distributor 14 measures.
- a differential pressure sensor 25 can be present, which via a line 26 is connected to the return 17 and measures the differential pressure ⁇ p.
- connections, via the controls take place, the connection is indicated in the figure between the control unit 23 and the fuel pump 11 and the connection between the control unit and the Vent valve 20, depending on the prevailing conditions is closed or open. Furthermore, a connection between the control unit 23 and the pressure regulator 16 his.
- the check valve 12 in the fuel circuit for example is integrated in the fuel pump 11 holds after switching off the fuel pump the system pressure p still upright for some time.
- the pressure sensor 24 which measures the fuel pressure p. Even after parking of the fuel pump 11, this pressure is measured and evaluated in the control unit. From the pressure curve obtained can the control unit or the one contained in the control unit Microprocessor determine the pressure gradient.
- This pressure gradient which serves as a measure of the change in pressure, can after one of the known gradient determination methods
- the pressure gradient can be two Pressure values are determined at a predeterminable time interval were determined from each other.
- the threshold SW to be determined is determined in the Control unit for the presence of a leak or one Leaks closed and, for example, a display 27 or warning signals can be given.
- a sensor with an analog output variable can be used as the pressure sensor 24 used, it is also possible to use a contact switch use, in which the pressure gradient gradp over the time between switching off the fuel pump and the switching time of the switch when falling below one predetermined system pressure is determined.
- the pressure sensor 24 is preferably on the in the figure shown position arranged, but it can also elsewhere. With return-free fuel supply systems can do the entire fuel system be monitored when the pressure sensor 24 on the in the Figure specified location is installed.
- Fuel supply systems with a fuel return 17 can also be completely monitored, that is to say also in the return area, provided that in addition to the check valve 12 on the fuel pump 11, a pressure control valve 18 is also attached to the outlet opening of the return line in the fuel tank. It is then possible to monitor not only the flow area, but also the return area until it exits the fuel tank.
- a differential pressure sensor 25 is used as the pressure sensor, which measures the differential pressure ⁇ p between the fuel supply and the return, for example on the fuel pressure regulator.
- a misfire detection can be performed from the combination of detection misfires on a particular injector and at the same time detected leak in the fuel system a leaky injector will be closed and thereby possible engine damage prevents or the leaky valve be localized right away.
- the control unit can detect the leak every time it is switched off the fuel pump, it is also possible that this detection only under predefinable conditions takes place, for example, only after long activation of the Fuel pump. Since the leak detection method in Control unit of the internal combustion engine runs, it is in the case of such a detection, an "on-board diagnosis". The Detection of an existing leak in the fuel supply system or directly in an injector can in one Memory of the control unit 23 are stored and is then the next time you visit the workshop as information.
- the leak detection after switching off the fuel pump and thus also takes place after the internal combustion engine has been switched off is a follow-up of the control unit sufficient Duration required, d. H. the control unit must be switched off the BKM can still be supplied with voltage the required functions can still run. If if the diagnosis is to be made in batches, it is necessary that the fuel pump from the control unit directly, i.e. independently can be controlled by the ignition lock.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims (5)
- Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem bei einer Brennkraftmaschine mit einem Steuergerät (23) zur Steuerung bzw. Regelung der Brennkraftmaschine, dem die erforderlichen Größen zugeführt werden, das die erforderlichen Berechnungen durchführt und entsprechende Ansteuergrößen bildet, mit einem Kraftstoffversorgungssystem, in dem der Kraftstoff von einer Kraftstoffpumpe (11) unter Druck aus dem Kraftstoffbehälter gefördert wird und über entsprechende Leitungen zu den Einspritzventilen (15) gelangt, mit einem Drucksensor (24), der den Kraftstoffdruck fortlaufend mißt und die Meßgrößen dem Steuergerät (23) zuführt, das den Verlauf des Kraftstoffdruckes nach Abschalten der Kraftstoffpumpe (11) ermittelt und den Verlauf mit einem vorgebbaren Verlauf vergleicht und bei erkannten Abweichungen eine Fehleranzeige auslöst, dadurch gekennzeichnet, daß das Steuergerät (23) eine Schuberkennung durchführt, daß bei erkanntem Schubbetrieb die Elektrokraftstoffpumpe (11) mittels Ansteuerung vom Steuergerät (23) abgeschaltet und die Leckerkennung durchgeführt wird.
- Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Drucksensor ein Differenzdrucksensor eingesetzt wird, der den Differenzdruck zwischen Kraftstoffvorlauf und Kraftstoffrücklauf mißt, daß der Gradient des Differenzdruckes (GRADδP) nach Abstellen der Kraftstoffpumpe ermittelt wird und dieser Gradient mit wenigstens einem unteren bzw. oberen Schwellwert (SWu bzw. SWo) verglichen wird und eine Fehlererkennung erfolgt, wenn der Gradient des Differenzdrucks größer ist als der obere Schwellwert (SWo) bzw. kleiner ist als der untere Schwellwert (SWu).
- Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Drucksensor zur Messung des Kraftstoffdrucks p im Verteiler (14) angeordnet ist und daß am Austritt der Rücklaufleitung (17) in den Kraftstoffbehälter (10) ein Druckhalteeventil (18) vorhanden ist.
- Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zur Ermöglichung einer Leckerkennung in der Kraftstoffrückführleitung ein Druckhalteventil am Austritt der Leitung in den Kraftstoffbehälter vorhanden ist.
- Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß im Steuergerät zusätzlich eine Aussetzererkennung abläuft, mit der erkannt wird, in welchen Zylindern keine Verbrennung stattgefunden hat und die Aussetzererkennung und die Leckerkennung miteinander kombiniert werden, zur eindeutigen Festlegung, welches der Einspritzventile undicht ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19513158A DE19513158A1 (de) | 1995-04-07 | 1995-04-07 | Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem |
DE19513158 | 1995-04-07 | ||
PCT/DE1996/000273 WO1996031693A1 (de) | 1995-04-07 | 1996-02-22 | Einrichtung zur erkennung eines lecks in einem kraftstoffversorgungssystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0819213A1 EP0819213A1 (de) | 1998-01-21 |
EP0819213B1 true EP0819213B1 (de) | 2000-05-03 |
Family
ID=7759114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96902879A Expired - Lifetime EP0819213B1 (de) | 1995-04-07 | 1996-02-22 | Einrichtung zur erkennung eines lecks in einem kraftstoffversorgungssystem |
Country Status (7)
Country | Link |
---|---|
US (1) | US5974865A (de) |
EP (1) | EP0819213B1 (de) |
JP (1) | JP3856827B2 (de) |
KR (1) | KR100413559B1 (de) |
CN (1) | CN1066242C (de) |
DE (2) | DE19513158A1 (de) |
WO (1) | WO1996031693A1 (de) |
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US9663096B2 (en) | 2015-02-20 | 2017-05-30 | Ford Global Technologies, Llc | Methods and systems for mitigating fuel injector leak |
JP2016170107A (ja) * | 2015-03-13 | 2016-09-23 | トヨタ自動車株式会社 | リークチェック装置 |
KR101807024B1 (ko) * | 2016-03-25 | 2018-01-10 | 현대자동차 주식회사 | 밸브 제어 장치 및 이를 이용한 밸브 제어 방법 |
US10041432B2 (en) | 2017-01-09 | 2018-08-07 | Caterpillar Inc. | Fuel system having pump prognostic functionality |
CN110594067B (zh) * | 2018-10-11 | 2022-03-15 | 罗伯特·博世有限公司 | 喷油器诊断系统和方法 |
DE102020203108A1 (de) | 2020-03-11 | 2021-09-16 | Pfeifer Holding Gmbh & Co. Kg | Verbindungselement zum kraftschlüssigen Verbinden von Betonbauteilen |
US12085216B2 (en) | 2022-02-17 | 2024-09-10 | Arctic Cat Inc. | Multi-use fuel filler tube |
FR3146710A1 (fr) * | 2023-03-15 | 2024-09-20 | Psa Automobiles Sa | Systeme d’injection de carburant de vehicule a moteur thermique ayant une fonction de diagnostic et gestion de panne d’injecteur |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8823693D0 (en) * | 1988-10-08 | 1988-11-16 | Hartopp R | Injector cleaning apparatus |
US5020362A (en) * | 1990-06-15 | 1991-06-04 | Hickok Electrical Instrument Company | Fuel injection system tester |
US5179922A (en) * | 1990-11-15 | 1993-01-19 | Proprietary Technology, Inc. | Apparatus for determining change of fuel flow |
DE4040896A1 (de) * | 1990-12-20 | 1992-06-25 | Bosch Gmbh Robert | Tankentlueftungsanlage und verfahren zum ueberpruefen der dichtheit derselben |
JPH04350358A (ja) * | 1991-05-29 | 1992-12-04 | Mitsubishi Electric Corp | 電子制御燃料噴射式内燃機関の燃料リーク自己診断装置 |
JP3316894B2 (ja) * | 1992-12-17 | 2002-08-19 | 株式会社デンソー | 蓄圧式燃料噴射装置の異常判断装置 |
DE4243178B4 (de) * | 1992-12-19 | 2005-07-14 | Robert Bosch Gmbh | Verfahren zur Erkennung undichter Einspritzventile bei einer Brennkraftmaschine |
GB9302958D0 (en) * | 1993-02-13 | 1993-03-31 | Lucas Ind Plc | Method of and apparatus for detecting fuel system leak |
DE19520300A1 (de) * | 1995-06-02 | 1996-12-05 | Bosch Gmbh Robert | Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem |
JP3449041B2 (ja) * | 1995-06-02 | 2003-09-22 | 株式会社デンソー | 内燃機関の燃料供給装置 |
-
1995
- 1995-04-07 DE DE19513158A patent/DE19513158A1/de not_active Withdrawn
-
1996
- 1996-02-22 DE DE59605135T patent/DE59605135D1/de not_active Expired - Lifetime
- 1996-02-22 WO PCT/DE1996/000273 patent/WO1996031693A1/de active IP Right Grant
- 1996-02-22 JP JP52983896A patent/JP3856827B2/ja not_active Expired - Fee Related
- 1996-02-22 KR KR1019970707035A patent/KR100413559B1/ko not_active IP Right Cessation
- 1996-02-22 US US08/930,203 patent/US5974865A/en not_active Expired - Lifetime
- 1996-02-22 EP EP96902879A patent/EP0819213B1/de not_active Expired - Lifetime
- 1996-02-22 CN CN96193108A patent/CN1066242C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE59605135D1 (de) | 2000-06-08 |
KR100413559B1 (ko) | 2004-03-31 |
WO1996031693A1 (de) | 1996-10-10 |
JP3856827B2 (ja) | 2006-12-13 |
JPH11503503A (ja) | 1999-03-26 |
US5974865A (en) | 1999-11-02 |
EP0819213A1 (de) | 1998-01-21 |
DE19513158A1 (de) | 1996-10-10 |
CN1066242C (zh) | 2001-05-23 |
KR19980703636A (ko) | 1998-12-05 |
CN1181125A (zh) | 1998-05-06 |
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