EP0819213A1 - Detecteur de fuite dans un systeme d'alimentation en carburant - Google Patents

Detecteur de fuite dans un systeme d'alimentation en carburant

Info

Publication number
EP0819213A1
EP0819213A1 EP96902879A EP96902879A EP0819213A1 EP 0819213 A1 EP0819213 A1 EP 0819213A1 EP 96902879 A EP96902879 A EP 96902879A EP 96902879 A EP96902879 A EP 96902879A EP 0819213 A1 EP0819213 A1 EP 0819213A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
leak
fuel pump
gradient
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.)
Granted
Application number
EP96902879A
Other languages
German (de)
English (en)
Other versions
EP0819213B1 (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

Links

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 relates to a device for detecting a leak in a Kraf material supply system in an internal combustion engine according to the preamble of the main claim.
  • the fuel In motor vehicles with an internal combustion engine, the fuel is conveyed from the fuel tank with the aid of an electric fuel pump and supplied to the injection valves via fuel lines. Excess fuel usually gets back into the fuel tank via a return line. To ensure that a sufficient amount of fuel is always available, the fuel is delivered by the electric fuel pump with an overpressure.
  • the electric fuel pump is regulated in a suitable manner, for example by measuring the fuel pressure and using it for evaluation.
  • the return line is dispensed with
  • the device according to the invention with the features of the main claim has the advantage that the entire fuel supply system can be monitored for leaks.
  • the simplicity of the device according to the invention is particularly advantageous, which can be used in most conventional fuel supply systems without the use of complex additional components.
  • This advantage is achieved by measuring the fuel pressure with the aid of a pressure sensor and by checking after switching off the electric fuel pump whether the overpressure in the fuel supply system changes in a specifiable manner. If this is not the case, it can be immediately recognized that there is a leak or a leak in the fuel supply system.
  • the leak detection can be carried out as a so-called “on-board diagnosis” and takes place, for example, in the control unit of the motor vehicle. It is also advantageous that the leak detection can be used both in fuel systems with a return line and in those without a return line.
  • the leak detection can advantageously also take place under special operating conditions of the internal combustion engine, for example if the control unit detects an engine overrun phase in which no fuel is supplied to the injection valves during the overrun fuel cutoff. During the overrun fuel cut-off, the electric fuel pump is then switched off and the leak diagnosis is then carried out.
  • a leak diagnosis during the overrun mode has the advantages that it can be carried out more often, that it can be repeated while driving and that no control unit overrun is required to carry out the diagnosis.
  • the figure shows the components of a fuel supply system of an internal combustion engine that are necessary for understanding the invention.
  • the fuel tank is designated by 10, in the fuel tank there is the fuel pump 11, usually an electric fuel pump and a check valve 12, which is integrated into the fuel pump 11, for example.
  • the flow 13 leads from the fuel pump 11 to the fuel distributor 14, via which the fuel is supplied to the injection valves 15.
  • the control of the fuel pressure takes place with the help of the pressure regulator 16, which is connected to the fuel tank 10 in a fuel supply system with a fuel return line or return 17 via the return 17 and optionally a pressure control valve 18 and optionally via a connection 28 to the intake manifold Internal combustion engine.
  • the fuel tank 10 is connected to the intake manifold 21 of the internal combustion engine via a line 19 in which there is a ventilation valve 20. Between the fuel tank 10 and the vent valve 20 there is also an adsorption filter 22 in which the fuel vapors are collected.
  • the control device 23 to which the required quantities are supplied or which emits the required control signals, is used to control or regulate the internal combustion engine.
  • the necessary calculations are carried out in the control unit.
  • the leak detection according to the invention is also carried out in the control unit.
  • a pressure sensor 24 is shown in the figure, which measures the pressure p of the fuel in the distributor 14.
  • a differential pressure sensor 25 which is connected to the return line 17 via a line 26 and measures the differential pressure ⁇ p.
  • the connections between the control unit 23 and the fuel pump 11 and the connection between the control unit and the venting valve 20, which depend on the prevailing conditions, are indicated in the figure as connections via which controls take place is closed or open. Furthermore, there may be a connection between the control unit 23 and the pressure regulator 16.
  • the leak diagnosis can run under the following boundary conditions:
  • control unit If the control unit detects an engine overrun phase, an overrun cut-off can take place during which no more fuel is supplied to the injection valves. The fuel pump can then be switched off during the fuel cut-off.
  • the check valve 12 in the fuel circuit which is integrated, for example, in the fuel pump 11, maintains the system pressure p for some time after the fuel pump has been switched off.
  • the pressure sensor 24, which measures the fuel pressure p is located on the pressure side of the check valve 12 in the fuel supply system. Even after the fuel pump 11 has been switched off, this pressure is measured and evaluated in the control unit.
  • the control device or that contained in the control device can be obtained from the pressure curve obtained Microprocessor determine the pressure gradient.
  • This pressure gradient which serves as a measure of the pressure change, can be determined according to one of the known gradient determination methods, for example the pressure gradient can be determined from two pressure values which were determined at a predeterminable time interval from one another.
  • control unit is alerted to the presence of a leak or one
  • Leaks are closed and a display 2 "can take place, for example, or warning signals can be emitted.
  • a sensor with an analog output variable can be used as the pressure sensor 24; it is also possible to use a contact switch in which the pressure gradient gradp is determined over the time between the switching off of the fuel pump and the switching time of the switch when the system pressure falls below a predetermined value .
  • the pressure sensor 24 is preferably arranged at the location shown in the figure, but it can also be located elsewhere. In the case of return-free fuel supply systems, the entire fuel system can be monitored if the pressure sensor 24 is installed at the point indicated in the figure.
  • Fuel supply systems with a fuel return 17 can also be completely monitored, that is to say also in the return area, provided that they are in addition to the check valve
  • a pressure holding valve 18 is also attached to the fuel pump 11 at the outlet opening of the return line in the fuel tank. It is then possible to monitor not only the forward flow area but also the return area up to the exit into the fuel tank.
  • a pressure sensor in this case a differential pressure sensor 25 is used, which measures the differential pressure ⁇ p between the fuel supply and the return, for example at the fuel pressure regulator.
  • the combination of the detection of combustion misfires on a specific injection valve and a leak detected in the fuel system at the same time can be used to infer a leaky injection valve and thereby prevent or prevent possible engine damage the leaky valve can be located correctly right away.
  • the control unit can detect the leak each time the fuel pump is switched off. It is also possible for this detection to take place only under predefinable conditions, for example only after the fuel pump has been switched on for a long time. Since the method for leak detection takes place in the control unit of the internal combustion engine, such a detection is an "on-board diagnosis".
  • the detection of an existing leak in the fuel supply system or directly in an injection valve can be stored in a memory of the control unit 23 and is then available as information the next time the workshop is visited.
  • the control unit must continue to run for a sufficient period of time, ie the control unit must still be supplied with voltage after the BKM has been switched off so that the required functions still work can expire. If the diagnosis is to take place in overrun, it is necessary that the fuel pump can be controlled directly by the control unit, ie independently of the ignition lock.

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.
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
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 (fr) 1995-04-07 1996-02-22 Detecteur de fuite dans un systeme d'alimentation en carburant

Publications (2)

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

Family

ID=7759114

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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EP3879045A1 (fr) 2020-03-11 2021-09-15 Pfeifer Holding GmbH & Co. KG Élément de liaison destiné à la liaison à force des composants en béton

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP3879045A1 (fr) 2020-03-11 2021-09-15 Pfeifer Holding GmbH & Co. KG Élément de liaison destiné à la liaison à force des composants en béton
DE102020203108A1 (de) 2020-03-11 2021-09-16 Pfeifer Holding Gmbh & Co. Kg Verbindungselement zum kraftschlüssigen Verbinden von Betonbauteilen

Also Published As

Publication number Publication date
CN1181125A (zh) 1998-05-06
KR19980703636A (ko) 1998-12-05
JPH11503503A (ja) 1999-03-26
JP3856827B2 (ja) 2006-12-13
EP0819213B1 (fr) 2000-05-03
DE19513158A1 (de) 1996-10-10
WO1996031693A1 (fr) 1996-10-10
CN1066242C (zh) 2001-05-23
KR100413559B1 (ko) 2004-03-31
DE59605135D1 (de) 2000-06-08
US5974865A (en) 1999-11-02

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