EP0819213B1 - Detecteur de fuite dans un systeme d'alimentation en carburant - Google Patents

Detecteur de fuite dans un systeme d'alimentation en carburant Download PDF

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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
Application number
EP96902879A
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German (de)
English (en)
Other versions
EP0819213A1 (fr
Inventor
Dieter-Andreas Dambach
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0819213A1 publication Critical patent/EP0819213A1/fr
Application granted granted Critical
Publication of EP0819213B1 publication Critical patent/EP0819213B1/fr
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
    • 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Testing Of Engines (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

La présente invention concerne un détecteur de fuite dans un système d'alimentation en carburant, conçu pour déterminer le gradient de la pression du carburant après coupure de la pompe de carburant et détecter ainsi un défaut pouvant survenir lorsque la réduction de la surpression se produit plus vite que prévu dans une partie du système d'alimentation en carburant.

Claims (5)

  1. Dispositif de détection d'une fuite dans un système d'alimentation de carburant dans le cas d'un moteur à combustion interne avec un appareil de commande (23) servant à commander ou à régler le moteur à combustion interne, appareil de commande auquel on amène les grandeurs nécessaires, et qui effectue les calculs nécessaires et forme les grandeurs de commande correspondantes, avec un système d'alimentation de carburant, dans lequel on transfert sous pression le carburant au moyen d'une pompe de carburant (11) à partir du réservoir de carburant et on l'amène par l'intermédiaire de conduites correspondantes aux injecteurs (15), avec un capteur de pression (24), qui mesure de façon continue la pression du carburant et amène les grandeurs mesurées à l'appareil de commande (23) qui détermine le déroulement de la pression du carburant après le débranchement de la pompe de carburant (11) et compare ce déroulement avec un déroulement qui peut être défini au préalable et dans le cas où des écarts sont détectés déclenche une indication de défaut,
    caractérisé en ce que
    l'appareil de commande (23) effectue une détection de poussée, et
    s'il a été détecté un fonctionnement en poussée la pompe électrique de carburant (11) est branchée au moyen d'une activation par l'appareil de commande (23) et la détection de fuites est effectuée.
  2. Dispositif selon la revendication 1,
    caractérisé en ce qu'
    on utilise comme capteur de pression un capteur de pression différentielle qui mesure la différence de pression entre le circuit d'arrivée du carburant et le circuit de retour du carburant, et
    le gradient de pression différentielle(GRADδP) est détecté après avoir débranché la pompe de carburant et ce gradient est comparé avec au moins une valeur de seuil inférieure ou supérieure (Swu ou Swo)et une détection de fuite a lieu quand le gradient de la pression différentielle est plus grand que la valeur de seuil supérieure (Swo) ou plus petite que la valeur de seuil inférieure (Swu)
  3. Dispositif selon la revendication 2,
    caractérisé en ce que
    le capteur de pression est disposé pour mesurer la pression du carburant p dans le distributeur (14) et
    à la sortie du circuit de retour (17) il y a dans le réservoir de carburant (10) une vanne de maintien de la pression (13).
  4. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    pour rendre possible la détection d'une fuite dans le circuit de retour du carburant il y a une soupape de maintien de la pression à la sortie de la conduite dans le réservoir de carburant.
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il se déroule dans l'appareil de commande en outre une détection de ratés de combustion, avec laquelle on détecte dans quel cylindre il n'y a pas eu de combustion et l'on combine la détection du raté de combustion et la détection de fuites, pour déterminer de façon univoque quel est l'injecteur qui présente un défaut d'étanchéité.
EP96902879A 1995-04-07 1996-02-22 Detecteur de fuite dans un systeme d'alimentation en carburant Expired - Lifetime EP0819213B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19513158 1995-04-07
DE19513158A DE19513158A1 (de) 1995-04-07 1995-04-07 Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem
PCT/DE1996/000273 WO1996031693A1 (fr) 1995-04-07 1996-02-22 Detecteur de fuite dans un systeme d'alimentation en carburant

Publications (2)

Publication Number Publication Date
EP0819213A1 EP0819213A1 (fr) 1998-01-21
EP0819213B1 true EP0819213B1 (fr) 2000-05-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96902879A Expired - Lifetime EP0819213B1 (fr) 1995-04-07 1996-02-22 Detecteur de fuite dans un systeme d'alimentation en carburant

Country Status (7)

Country Link
US (1) US5974865A (fr)
EP (1) EP0819213B1 (fr)
JP (1) JP3856827B2 (fr)
KR (1) KR100413559B1 (fr)
CN (1) CN1066242C (fr)
DE (2) DE19513158A1 (fr)
WO (1) WO1996031693A1 (fr)

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JP3856827B2 (ja) 2006-12-13
WO1996031693A1 (fr) 1996-10-10
DE19513158A1 (de) 1996-10-10
KR100413559B1 (ko) 2004-03-31
CN1066242C (zh) 2001-05-23
EP0819213A1 (fr) 1998-01-21
US5974865A (en) 1999-11-02
DE59605135D1 (de) 2000-06-08
JPH11503503A (ja) 1999-03-26
CN1181125A (zh) 1998-05-06
KR19980703636A (ko) 1998-12-05

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