EP1224392B1 - Procede et dispositif de commande du dosage du carburant alimentant un moteur a combustion interne - Google Patents

Procede et dispositif de commande du dosage du carburant alimentant un moteur a combustion interne Download PDF

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Publication number
EP1224392B1
EP1224392B1 EP00982995A EP00982995A EP1224392B1 EP 1224392 B1 EP1224392 B1 EP 1224392B1 EP 00982995 A EP00982995 A EP 00982995A EP 00982995 A EP00982995 A EP 00982995A EP 1224392 B1 EP1224392 B1 EP 1224392B1
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EP
European Patent Office
Prior art keywords
valve
injection
fuel
pressure
way
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.)
Revoked
Application number
EP00982995A
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German (de)
English (en)
Other versions
EP1224392A1 (fr
Inventor
Anja Melsheimer
Ole See
Roger Potschin
Marcus Parche
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
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Priority claimed from DE10038995A external-priority patent/DE10038995A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1224392A1 publication Critical patent/EP1224392A1/fr
Application granted granted Critical
Publication of EP1224392B1 publication Critical patent/EP1224392B1/fr
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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical

Definitions

  • the invention relates to a method and a device for controlling the fuel metering in an internal combustion engine.
  • Methods and apparatus for controlling fuel metering in an internal combustion engine are known. Frequently becomes used to control the fuel metering a valve, that controls the flow of fuel into the internal combustion engine. In a first position of the valve prevents this the Fuel flow. In a second position is the valve the fuel flow completely free.
  • piezoelectric actuators are known with which such valves are controllable.
  • PDE pump-nozzle unit
  • the PDE measures the corresponding engine cylinder Fuel too.
  • the closing time of the valve determines the beginning of injection, the closing time, i. the Duration of the closed state of the valve, determines the Injection quantity.
  • PLD pump-line-nozzle system
  • the pump line nozzle via an injection pump per engine cylinder, the from a shaft of the engine, for example the camshaft, is driven.
  • a valve With a valve, the injection time and controlled the injection quantity.
  • the pump and the nozzle connected to each other via a short line.
  • the invention is based on the object in a method and a device for controlling the fuel metering in an internal combustion engine the most accurate fuel metering to achieve. This task is accomplished by the in The features characterized in the independent claims solved.
  • the pump-nozzle unit 100 essentially comprises an actuator 105, via a connection 102, which is dashed is shown, a valve 110 influenced in such a way that it is at least a first closed and a second open position occupies.
  • the valve 110 is between a Fuel inlet 115, which also as a low pressure area can be designated and arranged a line 120.
  • a Fuel inlet 115 which also as a low pressure area can be designated and arranged a line 120.
  • the Low pressure range essentially includes a fuel tank, which is also referred to as a tank, from the fuel through a filter and a fuel pump to the valve 110 passes.
  • the line 120 connects an element space 130, in which a Pump piston 135 is movably arranged, that of a drive unit 140 is moved, with an injection nozzle 150th
  • the drive unit 140 is preferably directly or via a rocker arm of the camshaft of the internal combustion engine driven.
  • the injection nozzle 150 includes substantially a nozzle spring 152 and a nozzle needle 154.
  • the Control element 105 is controlled by a control unit 160 with drive signals applied.
  • As adjusting elements are usually Magnetic plate and particularly advantageous piezo actuators used.
  • valve 110 Is the valve 110 in its closed state, and the pump piston 135 moves such that the Element space 130 is reduced, so the pressure in the Line 120 and thus in the injector. From a certain Value of the pressure is opposed to the nozzle needle 154 the spring force of the nozzle spring 152 moves and gives the injection port 156 free, leaving fuel in the combustion chamber the internal combustion engine passes. If the valve 110 is located in its open position, so no pressure build-up is possible and there is no fuel injection.
  • the valve 110 By opening and closing the valve 110, the high pressure area, the through the element space, the line 120 and formed the fuel-filled portion of the injection nozzle will be connected to the low pressure area. From the time of closing the valve 110 starts the Pressure build-up in the high pressure area and the, fuel injection uses. When opening the valve 110, the builds Pressure in the line 120 and the injection ends. This that is, the opening and closing timing of the valve 110 the start of injection, the end of injection and thus the duration of injection certainly.
  • the control element 105 is dependent on a control unit 160 from the operating condition of the internal combustion engine, with different Sensors is detected, controlled so that the Valve opens or closes at the desired time and so that the injection starts at the desired time and ends at the desired time.
  • FIG. 2 shows a second embodiment of a pump-nozzle unit shown. This is essentially different of the embodiment of Figure 1, that the valve 110th the element space 130 directly to the fuel inlet 115th combines. Common to both embodiments is that the valve 110 the high pressure area with the low pressure area combines.
  • the valve 110 is driven such that it either its open or its closed position occupies.
  • This type of control is problematic because when opening the valve, the pressure in the high pressure area is very high quickly reduced to the pressure in the low pressure range. This leads, for example, that the nozzle needle very quickly moves into its closed position.
  • the injection into at least two partial injections is split. For example, it may be provided be that a pre-injection before the main injection he follows. To have a positive effect on the behavior of To have internal combustion engine, the two partial injections, for example, the pilot injection and the main injection, follow one another at a certain distance. Due to the complete pressure reduction when opening the valve not all time intervals can be realized, as a Minimum time required for the pressure build-up.
  • the invention is therefore intended that the control of the adjusting element takes place in such a way that the valve next to his two end positions open and closed additionally at least one intermediate position occupies. Especially easy this is to be realized if, as a control element, a piezo actuator is used.
  • a piezo actuator is the position or the expansion of the piezo actuator directly proportional to the voltage applied to the piezo actuator. Thereby it is possible that the actuator different positions can take. This will allow that Also, the valve 110 is placed in defined positions.
  • FIG. 3 various signals are plotted over time t.
  • the voltage U the applied to the piezoelectric actuator 105, applied.
  • the part figure 3b shows the state of the valve 110 over time t.
  • the partial figure 3c shows the state of the nozzle needle 154 depending on the time t.
  • the partial figure 3d shows the course of the pressure P in the nozzle needle or in the high pressure area.
  • the control of the pump-nozzle unit begins. This means from time t1 to time 2 is given by the controller 160 such a signal that the valve 110 closes. This is achieved in that the Voltage at the piezoelectric actuator 105 from a minimum value, preferably Zero is increasing to a second value. By doing illustrated embodiment, this increase is linear. The increase of the voltage at the piezo-actuator 105 has to Result that the valve 110 is slow from its open in moves its closed position. The nozzle needle shows no reaction yet, she stays in her closed position. The pressure in the high pressure area rises slowly.
  • valve 110 held in the first intermediate position. This will achieved in that the voltage U on the piezo actuator on his Intermediate value is maintained. This causes the valve 110 is also in its first intermediate position. The pressure P in the element space slowly degrades and the Nozzle needle reaches its closed position and stays in their closed position.
  • the voltage and thus the position of the valve and / or the Duration between times t4 and t5 is chosen that no over-relief occurs. This will achieve that defined at the beginning of the next injection Conditions exist. This can cause variations in the amount of fuel significantly reduced for the same activation period become.
  • control valve 110 closed again, i. the voltage at the piezo actuator 105 rises again to its maximum value.-As a result, that the valve 110 passes into its closed state.
  • the pressure P in the pressure range begins to increase again.
  • valve 110 is not fully opened.
  • valve 110 is in one held second intermediate position, which is insignificant different from the closed position. This means, it can escape a small amount of liquid.
  • the cross section is chosen such that no further increase in pressure takes place. This means, that the pressure during the period t7 to t8 almost constant remains, i. that it results in a print plateau.
  • the piezo actuator is driven in such a way that the valve 110 opens, i. the tension is on their initial value withdrawn. This has the consequence that the valve goes into its fully open position. Of the Pressure P drops to the pressure value in the low pressure range, and the nozzle needle remains in its closed position.
  • the described drive includes a main injection as a second partial injection and a pilot injection as the first partial injection. This is a remote pre-injection without a so-called over-relief during the injection break. This is achieved by that the valve between the two partial injections is controlled such that it is in a first intermediate position remains.
  • the invention provides that preferably during the main injection a limitation of the pressure in High pressure area is done. It is particularly advantageous if in the partial load range, i. at low speeds and / or at small injected fuel quantities a large injection pressure is selected, i. that during an injection in the partial load range in the period t7 to t8 the valve remains in its fully closed position. For big ones Speeds and / or large injection quantities becomes a limitation the injection pressure is selected, i. that in the period t7 to t8, the valve is in the second intermediate position. This allows mechanical loads of Pump and the drive can be reduced.
  • the valve is controlled during the injection in such a way that it remains in a second intermediate position.
  • the pressure reduction rate is by specifying the first or the third intermediate position of the valve adjustable. This setting preferably takes place depending on the operating state the internal combustion engine. This can both at the end of the pilot injection as well as at the end of the main injection.
  • valve 110 at the end of the injection is driven so that it is in a third intermediate position remains.
  • the pressure reduction is controllable, the sounds, preferably by The pump can be generated, significantly reduced.
  • time intervals t4 to t5 or t7 to t8 and t9 to t10 are preferably dependent on the speed, the beginning the injection and / or other operating parameters specified.
  • Figure 4a is a conventional control without intermediate position represented, i. the voltage is for the pre-injection raised to its maximum value and then up lowered the minimum value. For the main injection will the voltage increases again to the maximum value and at the end the main injection lowered to the minimum value.
  • subfigure 4b the course is an accumulated pre-injection shown. That at the beginning of the pre-injection the voltage is raised to an intermediate value and then with the beginning of the main injection with the maximum value guided. The intermediate value is just below the maximum value. At the end of the injection, the tension on reset the minimum value.
  • subfigure 4c is a corresponding control with a Post-injection shown. This is different in the essential to the drive according to FIG. 3 therein, that in the main injection no reduction in the period between times 7 and t8, but that only a flexible pressure reduction rate is set. In short distance after the main injection then takes one further control to achieve the post-injection.
  • the procedure according to the invention is not for use limited to pump-nozzle units. She can too in other injection systems in which a valve for Control of the pressure in the high pressure area is used be used.
  • the inventive Procedure for controlling a pump-line nozzle system or a common rail system suitable.

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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)

Claims (10)

  1. Procédé de commande du dosage de carburant d'un moteur à combustion interne comprenant une soupape pour commander la pression au niveau d'une aiguille d'injecteur et ainsi le débit de carburant dans le moteur à combustion interne,
    la soupape étant commandée à l'aide d'un élément d'actionnement de façon à interdire le passage de carburant dans une première position et de libérer complètement le passage de carburant dans une seconde position,
    caractérisé en ce que
    dans certains états de fonctionnement, l'élément d'actionnement est commandé pour que la soupape prenne au moins une position intermédiaire,
    cette position intermédiaire étant réglée selon un taux de diminution de pression, souhaité au niveau de l'aiguille d'injecteur.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la soupape est commandée entre deux injections partielles pour rester dans une première position intermédiaire.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    pendant une injection, la soupape est commandée pour rester dans une seconde position intermédiaire.
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'
    à la fin d'une injection, la soupape est commandée pour rester dans une troisième position intermédiaire.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la position intermédiaire est réglée au moins en fonction d'une grandeur caractéristique de l'état de fonctionnement du moteur à combustion interne.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'élément d'actionnement est un actionneur piézo-électrique.
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'élément d'actionnement est commandé pour que la pression du carburant reste constante au moins pendant une phase de l'injection.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'élément d'actionnement est commandé pour que la soupape reste fermée pendant une durée prédéterminée dans une phase au début de l'injection.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    l'élément d'actionnement est commandé pour qu'à la suite de la phase au cours de laquelle la soupape reste fermée, l'élément d'actionnement est commandé pour que la pression du carburant reste constante.
  10. Dispositif de commande du dosage de carburant d'un moteur à combustion interne à l'aide d'une soupape de commande de la pression au niveau d'une aiguille d'injecteur et ainsi du débit de carburant dans le moteur à combustion interne selon lequel, la soupape est commandée à l'aide d'un élément d'actionnement pour que dans une première position le passage de carburant soit interdit et que dans une seconde position le passage de carburant soit complètement libéré,
    caractérisé par
    des moyens qui dans certains états de fonctionnement commandent l'élément d'actionnement pour que la soupape occupe au moins une position intermédiaire, la position intermédiaire étant réglée en fonction d'un taux souhaité de réduction de pression au niveau de l'aiguille d'injecteur.
EP00982995A 1999-10-16 2000-10-12 Procede et dispositif de commande du dosage du carburant alimentant un moteur a combustion interne Revoked EP1224392B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19950036 1999-10-16
DE19950036 1999-10-16
DE10038995 2000-08-10
DE10038995A DE10038995A1 (de) 1999-10-16 2000-08-10 Verfahren und Vorrichtung zur Steuerung der Kraftstoffzumessung in einer Brennkraftmaschine
PCT/DE2000/003602 WO2001029408A1 (fr) 1999-10-16 2000-10-12 Procede et dispositif de commande du dosage du carburant alimentant un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1224392A1 EP1224392A1 (fr) 2002-07-24
EP1224392B1 true EP1224392B1 (fr) 2005-08-31

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ID=26006648

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Application Number Title Priority Date Filing Date
EP00982995A Revoked EP1224392B1 (fr) 1999-10-16 2000-10-12 Procede et dispositif de commande du dosage du carburant alimentant un moteur a combustion interne

Country Status (4)

Country Link
EP (1) EP1224392B1 (fr)
JP (1) JP2003512563A (fr)
DE (1) DE50011077D1 (fr)
WO (1) WO2001029408A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6417971B2 (ja) * 2015-01-28 2018-11-07 株式会社デンソー 吸入調量弁

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529164A (en) * 1982-03-05 1985-07-16 Nippon Soken, Inc. Piezo-type valve
DE19546033A1 (de) * 1995-12-09 1997-06-12 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19729844A1 (de) * 1997-07-11 1999-01-14 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung
DE19742073A1 (de) * 1997-09-24 1999-03-25 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE29717649U1 (de) * 1997-10-02 1997-11-20 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
EP1224392A1 (fr) 2002-07-24
WO2001029408A1 (fr) 2001-04-26
JP2003512563A (ja) 2003-04-02
DE50011077D1 (de) 2005-10-06

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