EP0577477B1 - Brennstoffeinspritzvorrichtung für Brennkraftmaschine - Google Patents

Brennstoffeinspritzvorrichtung für Brennkraftmaschine Download PDF

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Publication number
EP0577477B1
EP0577477B1 EP19930401634 EP93401634A EP0577477B1 EP 0577477 B1 EP0577477 B1 EP 0577477B1 EP 19930401634 EP19930401634 EP 19930401634 EP 93401634 A EP93401634 A EP 93401634A EP 0577477 B1 EP0577477 B1 EP 0577477B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
engine
control system
injection 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
EP19930401634
Other languages
English (en)
French (fr)
Other versions
EP0577477A1 (de
Inventor
Dominique Guerin
Oreste Mauro
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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
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Publication of EP0577477A1 publication Critical patent/EP0577477A1/de
Application granted granted Critical
Publication of EP0577477B1 publication Critical patent/EP0577477B1/de
Anticipated expiration legal-status Critical
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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
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by 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
    • 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
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure

Definitions

  • the present invention relates to a fuel injection system for an internal combustion engine fitted to a motor vehicle.
  • This device is more particularly intended to detect and prevent the occurrence of misfires due to a fuel supply fault.
  • the catalytic converters have the disadvantage of being relatively fragile.
  • the monoliths carrying the catalyst are quickly destroyed by rapid and abnormal increases in temperature.
  • Such increases occur during misfires due in particular to an insufficient fuel supply.
  • the misfires in fact cause the arrival in the catalytic converter of unburnt fuel and air which then oxidize on contact with the monolith and cause a strong release of heat.
  • the object of the invention is therefore to propose a fuel injection system intended to equip multi-cylinder internal combustion engines of motor vehicles which makes it possible to detect and prevent the occurrence of a lack of fuel.
  • the fuel injection system comprises a circuit for supplying fuel under pressure from a storage tank to one or more electro-injectors controlled by an engine control system controlling the opening time of each electro-injector according to the engine operating conditions.
  • the circuit includes in particular, a pump pressure, a fuel filter and a differential pressure regulator controlling the return of excess fuel to the tank.
  • the injection system is characterized in that it comprises a device for monitoring in particular the difference between the pressure of the fuel in the supply circuit and that of the combustion air in the intake manifold, this monitoring device being capable of emitting an alert signal when this pressure difference is less than a predetermined threshold.
  • the alert signal emitted by the monitoring device acts on switch means controlling the operation of the electro-injectors so as to prohibit any injection of fuel when the deviation from pressure is below the predetermined threshold.
  • the alert signal emitted by the monitoring device acts directly on the engine control system so as to prevent any fuel injection when the pressure difference is less than the predetermined threshold.
  • the monitoring device comprises a differential pressure sensor disposed in the fuel supply circuit downstream of said pump repressing.
  • This pressure sensor is then directly connected to the engine control system, the latter comprising processing means able to compare the value of the pressure supplied by the pressure sensor and a predetermined threshold reference value and to produce a signal of alert when the value of this differential pressure is lower than the predetermined value.
  • the monitoring device comprises an electrical circuit provided with a switch controlled by the fuel pressure in the supply circuit, the closing or the opening of the switch following the drop in differential pressure below a predetermined value generating the production of the alert signal.
  • the switch is formed by the pressure regulator (to be compared with claim 1).
  • the switch is formed by a pressure regulator of the membrane type fixed on the injection rail, this regulator being formed by two housing elements made of electrically conductive material, a lower housing element which connected to earth and in which the fuel circulates, and an upper housing element in communication with the engine air manifold and in which a calibrated spring is housed, the upper housing element being connected by a connection electric to the electronic engine control system, a deformable membrane of electrically insulating material separating the two housing elements, this membrane being capable of bringing the two housing elements into electrical contact according to the fuel pressure value.
  • the injection system in accordance with the invention, it comprises memory means coupled to the device for monitoring the pressure in the fuel intake circuit in order to keep the history of pressure anomalies occurring in the circuit d 'admission.
  • the storage means are integrated into the electronic engine control system and in that the information contained in these means is accessible from the diagnostic frame of the electronic engine control system .
  • the injection system in accordance with the invention, it comprises means for displaying a message intended for the driver of the vehicle coupled to the device for monitoring the pressure in the supply circuit to alert the driver to the need to stop engine operation without further delay.
  • the fuel injection system for an internal combustion engine shown in FIG. 1 conventionally comprises a circuit 10 for supplying pressurized fuel from the fuel tank 4 to the electro-injectors 9.
  • the electro-injectors 9 are controlled by an electronic engine control system 3 which determines the opening time of the different injectors and therefore the quantity of fuel injected.
  • the fuel supply circuit 10 includes an electrically driven pressure pump 5. Inside the pump 5, a safety valve avoids overpressures and at the outlet, a non-return valve prevents the circuit from being primed when the engine stops.
  • the pump 5 sends the fuel through a filter 6, then into the injection manifold 7 which communicates with the different injectors.
  • the differential injection pressure, between the fuel supply circuit and the intake manifold is kept constant, whatever the flow rate of the injectors 9, by the pressure regulator 8 which monitors the return flow rate to the tank 4, of excess fuel.
  • the injection system comprises a device for monitoring the differential pressure of the fuel supplying the various electro-injectors which makes it possible to issue an alert signal when the differential pressure of the fuel is less than a predetermined value.
  • a drop in the differential pressure of the fuel corresponds to a lack of fuel in the supply circuit 10, lack of fuel which can prove detrimental to the engine if the injection of fuel continues; also the monitoring device is coupled to switch means which stop the operation of the electro-injectors 9 when the alert signal is issued.
  • the monitoring device and the switch means are formed by an electric circuit provided with a switch controlled by the differential pressure of the fuel in the supply circuit 10.
  • the electric circuit being connected to the engine control system 3, the latter comprising processing means able to identify the position of the switch, open or closed, so as to emit an alert signal which generates the stopping of the actuation of the electro-injectors 9 by the engine control system 3.
  • the electronic engine control system 3 conventionally comprises a microcomputer comprising a CPU, a random access memory, a read only memory, analog-digital converters and various input and output interfaces.
  • This engine control system 3 receives input signals relating in particular to the various operating parameters of the engine, performs operations and generates output signals intended in particular for injectors 9.
  • the switch is formed by the regulator 8, shown in detail in FIG. 2, the latter is of the differential membrane type. It is defined according to the invention by the assembly of a lower housing element 17 and an upper housing element 13, made of electrically conductive material; the lower box 17 being directly connected to the ground of the vehicle and the upper box 13 being connected to the engine control system by means of a conducting wire 83.
  • the engine control system being capable of generating a certain voltage across the terminals of this electric circuit and to control the passage or not of a current through it.
  • the lower housing element 17 formed of a cylindrical side wall closed at its lower end by a flat bottom wall, is directly fixed to the frame 18 of the engine.
  • This housing element 17 determines a chamber through which the fuel from the injection rail circulates and therefore comprises for this purpose a lateral connection 47 for the arrival of the fuel.
  • This fuel chamber comprises a conduit 74 returning to the tank passing through the bottom wall and extending substantially vertically in the axis of the housing element 17; the inlet opening of the return duct 74 is positioned at the upper joint plane of the housing element 17, joint plane determined by the upper end forming the rim of the lateral cylindrical wall.
  • the return duct 74 which is integral with the housing element 17 is also made of conductive material.
  • This housing element 13 is formed, similarly to the lower housing element 17 of a cylindrical side wall closed at its upper end by a wall flat background.
  • This housing element 13 determines a chamber in which is housed a suitably calibrated pressure spring 14, bearing against the bottom wall.
  • the spring 14 is made of conductive material.
  • An electrical terminal 15 is secured to the external side wall of the housing element 13 to allow the connection of the electrical wire 83 connecting the regulator to the engine monitoring system.
  • a deformable membrane 19 in insulating material.
  • This membrane 19 carries on its lower face a cover 11 made of conductive material intended to cooperate with the inlet orifice of the return duct 74 and on its upper face a spring cup 12 also made of conductive material on which the lower end rests. of the spring 14.
  • the cover 11 and the cup 12 are secured to the membrane 19 by means of a conductive rivet 16 which provides an electrical connection between the cover 11 and the spring cup 12.
  • the membrane 19 is clamped at its periphery between the joint planes of the housing elements 17 and 13 by means of a crimping 37.
  • This crimping 37 ensures the fixing of the two housing elements 17 and 13.
  • the crimping 37 made of insulating material also participates in the electrical insulation operated between the side walls of the housing elements 17 and 13 by the interposition of the membrane 19.
  • the calibrated spring chamber is connected to the intake manifold so as to keep the pressure difference constant on either side of the injector valve; the flow of these therefore only depends on their opening time.
  • the device 8 therefore acts as a switch controlled by the differential pressure of the fuel.
  • the regulator 8 ensures the passage of an electric current from the wire 83 between the two housing elements 13 and 17 only when the cover is in abutment against the return duct 74.
  • the regulator constitutes an electric switch ensuring the passage of current from the lower housing element 17 to the upper housing element 13 via the conduit 74, the cover 1, the rivet, the spring cup 2 and the spring 4, only when the cover 1 remains in abutment against the conduit 74, that is to say when the fuel differential pressure is insufficient.
  • the position of the switch, closed or open, then provides direct and simple information on a lack or not of fuel in the supply circuit and thus allows the engine control system to implement a preprogrammed strategy capable of preventing the occurrence of '' a fuel failure with harmful consequences for the engine and in particular for the catalytic converter fitted to the exhaust line
  • the drop in fuel pressure is reflected in the chamber formed by the lower housing element 17 of the pressure regulator 8.
  • the diaphragm 19 under the action of the calibrated spring and the pressure prevailing in the intake manifold then presses the cover 11 against the return duct 74 closing the opening of the latter and ensuring the electrical contact between the two housing elements 17 and 13.
  • the passage of the electric current and the drop in the impedance which accompanies it are then detected by the engine control system 3.
  • the pressure drop information can cause the fuel injectors supply to be cut, for example by imposing a zero injection time. The engine then stops before the dry out occurs and without damage to the engine.
  • the storage can be operated in particular in the RAM of the engine control system and can be interrogated from the diagnostic frame equipping the engine control system.
  • the monitoring device can be formed by a pressure sensor disposed in the fuel supply circuit 10 downstream of said pressure pump 5, for example at the level of the injection manifold 7, said pressure sensor being directly connected to said engine control system 3, the latter then comprising processing means capable of comparing the value of the pressure supplied by the pressure sensor with a predetermined reference value and of producing an alert signal when the value of the pressure is less than said predetermined value.

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  • 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)

Claims (5)

  1. System zur Kraftstoffeinspritzung für einen in ein Kraftfahrzeug eingebauten Verbrennungsmotor 1, mit einer Zufuhrleitung 10 für unter Druck stehenden Kraftstoff von einem Vorratstank 4 aus zu einem oder mehreren Elektro-Einspritzdüsen 9, die von einem Motorsteuerungssystem 3 gesteuert werden, welches die Öffnungszeit einer jeden Elektro-Einspritzdüse 9 steuert in Abhängigkeit von den Betriebsbedingungen des Motors, wobei die Leitung 10 eine Druckpumpe 5, einen Kraftstoffilter 6, einen Druckregler 8, welcher das Zurückführen des überschüssigen Kraftstoffs in den Tank regelt und eine Überwachungsanordnung 8,3 für den Druck des die Elektro-Einspritzdüsen 9 versorgenden Kraftstoffs aufweist, wobei die Überwachungsanordnung 8,3 insbesondere ein Warnsignal abgeben kann, das jegliche Kraftstoffeinspritzung unterbindet, wenn der Druck des Kraftstoffs kleiner als ein vorgegebener Schwellwert ist, dadurch gekennzeichnet, daß die Überwachungsanordnung einen elektrischen Schaltkreis aufweist, der mit einem Unterbrecher verbunden ist, der direkt mit dem Motorsteuerungssystem 3 verbunden ist und in den Druckregler 8 integriert ist, wobei das Schließen oder die Öffnung des Unterbrechers als Folge eines Kraftstoffdruckabfalls unterhalb eines vorgegebenen Wertes das Warnsignal erzeugt.
  2. System zur Kraftstoffeinspritzung nach Anspruch 1 dadurch gekennzeichnet, daß der Unterbrecher aus einem Druckregler 8 mit einer Membran besteht, der an der Einspritzversorgung 7 befestigt ist, daß der Regler 8 aus zwei Gehäuseteilen 13, 17 aus elektrisch leitendem Material besteht, nämlich einem unterem Gehäuseteil 17, welches mit der Masse verbunden ist und in dem der Kraftstoff zirkuliert und aus einem oberen Gehäuseteil 13, das mit dem Luftkrümmer des Motors verbunden ist und in dem eine voreingestellte Feder angeordnet ist, wobei das obere Gehäuseteil 13 über eine elektrische Verbindung 83 mit dem Motorsteuerungssystem 3 verbunden ist und wobei eine verformbare Membran 19 aus elektrisch isolierendem Material die beiden Gehäuseteile 13, 17 trennt, jedoch einen elektrischen Kontakt zwischen den beiden Gehäuseteilen 13, 17 bei entsprechendem Kraftstoffdruck ermöglicht.
  3. System zur Kraftstoffeinspritzung nach Anspruch 2, dadurch gekennzeichnet, daß es eine Speicheranordnung aufweist, welche mit der Überwachungsanordnung 8,3 für den Druck in der Kraftstoffzufuhrleitung 10 verbunden ist zur Aufzeichnung von plötzlich auftretenden Druckanomalien in der Zufuhrleitung 10.
  4. System zur Kraftstoffeinspritzung nach Anspruch 3, dadurch gekennzeichnet, daß die Speicheranordnung in das Motorsteuerungssystem 3 integriert ist und daß die in dieser Anordnung enthaltenen Informationen über den Diagnoseanschluß des Motorsteuerungssystems 3 zugänglich sind.
  5. System zur Kraftstoffeinspritzung nach Anspruch 1, dadurch gekennzeichnet, daß es eine Anzeigeanordnung für eine Nachricht für den Fahrzeugführer aufweist, die mit der Überwachungsordnung 8,3 für den Druck in der Zufuhrleitung 10 verbunden ist, um den Fahrer über die Notwendigkeit zu informieren, den Betrieb des Motors unverzüglich zu unterbrechen.
EP19930401634 1992-06-30 1993-06-25 Brennstoffeinspritzvorrichtung für Brennkraftmaschine Expired - Lifetime EP0577477B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9208012 1992-06-30
FR9208012A FR2692937B1 (fr) 1992-06-30 1992-06-30 Systeme d'injection de carburant pour un moteur a combustion interne.

Publications (2)

Publication Number Publication Date
EP0577477A1 EP0577477A1 (de) 1994-01-05
EP0577477B1 true EP0577477B1 (de) 1995-12-27

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Application Number Title Priority Date Filing Date
EP19930401634 Expired - Lifetime EP0577477B1 (de) 1992-06-30 1993-06-25 Brennstoffeinspritzvorrichtung für Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0577477B1 (de)
DE (1) DE69301133T2 (de)
ES (1) ES2081698T3 (de)
FR (1) FR2692937B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6453878B1 (en) 1998-07-13 2002-09-24 Magneti Marelli France Electrically controlled fuel supply pump for internal combustion engine
US6672147B1 (en) 1998-12-14 2004-01-06 Magneti Marelli France Method for detecting clogging in a fuel filter in an internal combustion engine supply circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725245B1 (fr) * 1994-10-03 1996-12-20 Marwal Systems Dispositif d'alimentation en carburant pour vehicule automobile avec regulation de pression
FR2833307B1 (fr) * 2001-12-12 2004-10-15 Renault Systeme d'alimentation d'un dispositif en fluide et utilisation d'un tel systeme pour l'alimentation en carburant d'un moteur a combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1591783A (en) * 1977-07-08 1981-06-24 Allied Chem Fuel injection system with means to inhibit injection below a determined pressure
US4413248A (en) * 1980-12-31 1983-11-01 Brunswick Corporation Low fuel pressure monitor for internal combustion engine
JPS60122236A (ja) * 1983-12-05 1985-06-29 Toyota Motor Corp 内燃機関の燃料供給制御装置
CH671609A5 (de) * 1985-06-24 1989-09-15 Mitsui Shipbuilding Eng Vorrichtung zum verhindern eines uebermaessigen durchflusses von gasfoermigem brennstoff durch eine einspritzduese eines dieselmotors.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6453878B1 (en) 1998-07-13 2002-09-24 Magneti Marelli France Electrically controlled fuel supply pump for internal combustion engine
US6672147B1 (en) 1998-12-14 2004-01-06 Magneti Marelli France Method for detecting clogging in a fuel filter in an internal combustion engine supply circuit

Also Published As

Publication number Publication date
ES2081698T3 (es) 1996-03-16
FR2692937B1 (fr) 1995-07-07
EP0577477A1 (de) 1994-01-05
DE69301133T2 (de) 1996-08-14
FR2692937A1 (fr) 1993-12-31
DE69301133D1 (de) 1996-02-08

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