EP1488089A1 - Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection - Google Patents

Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection

Info

Publication number
EP1488089A1
EP1488089A1 EP03727149A EP03727149A EP1488089A1 EP 1488089 A1 EP1488089 A1 EP 1488089A1 EP 03727149 A EP03727149 A EP 03727149A EP 03727149 A EP03727149 A EP 03727149A EP 1488089 A1 EP1488089 A1 EP 1488089A1
Authority
EP
European Patent Office
Prior art keywords
piezo
pressure
control valve
current
current pulse
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
EP03727149A
Other languages
German (de)
English (en)
Other versions
EP1488089B1 (fr
Inventor
Ralf Marohn
Richard Pirkl
Walter Schrod
Peter Voigt
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.)
Continental Mechatronic Germany GmbH and Co KG
Original Assignee
Volkswagen Mechatronic GmbH and Co KG
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 Volkswagen Mechatronic GmbH and Co KG filed Critical Volkswagen Mechatronic GmbH and Co KG
Publication of EP1488089A1 publication Critical patent/EP1488089A1/fr
Application granted granted Critical
Publication of EP1488089B1 publication Critical patent/EP1488089B1/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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • the invention relates to a method and a device for controlling the piezo actuator during the closing process of a piezo control valve of a pump-nozzle unit.
  • Pump-nozzle units are used to supply fuel into a combustion chamber of an internal combustion engine.
  • This can be, for example, a pump-nozzle unit with a control and / or controllable fuel pump, a fuel injection nozzle which has a nozzle needle which can be moved back and forth between a closed position and an open position, a first pressure chamber which is separated from the fuel pump a first pressure fuel can be filled, a second pressure chamber, wherein in the second pressure chamber fuel under a second pressure exerts a closing force on the nozzle needle, and a third pressure chamber that communicates with the first pressure chamber, in the third pressure chamber below a third pressure fuel exerts an opening force on the nozzle needle.
  • Pump-nozzle units are used in particular in connection with pressure-controlled injection systems.
  • An essential feature of a pressure-controlled injection system is that the fuel injection nozzle opens as soon as an opening force that is at least influenced by the currently prevailing pressures is exerted on the nozzle needle.
  • Such pressure-controlled injection systems are used for fuel metering, fuel conditioning, shaping the injection process and sealing the fuel supply against the combustion chamber of the internal combustion engine.
  • the time course of the volume flow can be controlled in an advantageous manner during the injection. This can have a positive impact on performance, the fuel consumption and pollutant emissions of the engine are taken.
  • the fuel pump and the fuel injection nozzle are generally designed as an integrated component. At least one pump-nozzle unit is provided for each combustion chamber of the internal combustion engine and is usually installed in the cylinder head.
  • the fuel pump typically includes a fuel pump piston that can be moved back and forth in a fuel pump cylinder and is driven either directly by a tappet or indirectly by rocker arm of a camshaft of the internal combustion engine.
  • the section of the fuel pump cylinder which usually forms the first pressure chamber can be connected to a low-pressure fuel region via a control valve, fuel being sucked into the first pressure chamber from the low-pressure fuel region when the control valve is open, and into the fuel chamber from the first pressure chamber when the control valve is still open. Low pressure area is pushed back.
  • Pump-nozzle unit is known for example from EP 0 277 939 B1.
  • pump-nozzle units In order to avoid the problems caused by the use of solenoid valves, it is also already known to equip pump-nozzle units with a control valve which is operated piezoelectrically. Such a pump-nozzle unit is known for example from DE 198 35 494 AI.
  • the piezo actuator It is known to control the piezo actuator with a single-pulse current package when the piezo control valve closes.
  • the single-pulse current packet can be formed by a sine half-wave or a plurality of pulsed current packets immediately following one another.
  • This known control of the piezo actuator can lead to a so-called bouncer when the piezo control valve closes as soon as the valve needle reaches the valve seat.
  • Such a bouncer can lead to one or more of the following functional problems:
  • the liquid column is torn off and a pronounced cavitation occurs, whereby the piezo control valve may also open unintentionally when the cavitation is recompressed.
  • the object of the invention is to develop the generic methods and devices in such a way that unwanted bouncers are avoided or at least reduced when a piezo control valve is closed. This object is solved by the features of the independent claims.
  • the method according to the invention builds on the generic prior art in that the control comprises at least a first current pulse and a second current pulse following this at a time interval.
  • the valve needle of the piezo control valve is set in motion with the first current pulse.
  • the second current pulse following the first current pulse with a time interval, which preferably lasts until the valve needle strikes the valve seat, serves to ensure a rapid build-up of sealing force. Bouncing of the valve needle after reaching the valve seat is avoided or at least reduced by the control according to the invention, which results in lower pressure vibrations in the element space and less cavitation in the control and actuator space.
  • activation is to be understood in particular as the charging of the piezo actuator.
  • charging is divided into at least two charge packets, different charge contents being possible.
  • a partial current level is maintained between the first current pulse and the second current pulse.
  • the level of the partial flow level can vary for different operating states.
  • it can be used to adapt the control to different types of piezo control valve. Particularly good results are achieved with the method according to the invention if it is provided that the control is carried out by circuit devices which comprise at least one analog amplifier. By means of analog circuit devices, in particular by means of analog amplifiers, continuous piezo currents can be achieved.
  • control is current-controlled and / or controlled, in particular transformer-based.
  • CC control Current Control
  • CC Current Control
  • the use of a CC power amplifier is particularly advantageous in terms of costs.
  • the device according to the invention builds on the generic state of the art in that it generates at least one first current pulse and one second current pulse following this at a time interval for control purposes.
  • the advantages explained in connection with the method according to the invention result in the same or similar manner, which is why reference is made to the corresponding statements in order to avoid repetitions.
  • the device it can be provided that it is between the first Current pulse and the second current pulse maintains a partial current level.
  • the device according to the invention has at least one analog amplifier.
  • the device according to the invention can also be used to carry out the control in a current-controlled and / or controlled manner, in particular with the aid of a transformer.
  • the invention is based on the finding that the movement of the coupled valve mechanism can be modeled via the electrical control of the piezo actuator.
  • the valve needle course can be acted on electrically, in particular for deflection and for building seat force.
  • FIG. 1 shows a schematic embodiment of a pump-nozzle unit with or with which the method according to the invention or the device according to the invention can be used;
  • FIG. 2a shows a schematic partial sectional view of a piezo control valve which closes in the flow direction from the high-pressure area to the low-pressure area and can be used with the pump-nozzle unit according to FIG. 1
  • FIG. 2b shows a schematic partial sectional view of a piezo control valve which closes in the opposite direction to the flow from the high pressure area to the low pressure area and can likewise be used with the pump-nozzle unit according to FIG. 1;
  • FIG. 3 shows an example of the course of the piezo control current for closing the piezo control valve according to the prior art, with analog control;
  • FIG. 4 shows a second example of the course of the piezo control current for closing the piezo control valve according to the prior art, with CC control;
  • FIG. 5 shows an example of the course of the piezo drive current for closing the piezo control valve according to the present invention, with analog control;
  • FIG. 6 shows a second example of the course of the piezo control current for closing the piezo control valve according to the present invention, with CC control;
  • FIG. 7 shows a graph which shows the course of the piezo
  • Control current, the piezo voltage, the valve needle lift, the high-pressure chamber pressure and the pressure in the outlet area of the pump-nozzle unit for a control according to the prior art and two control variants according to the invention;
  • FIG. 9 shows a graph which illustrates the course of the piezo voltage, the valve needle lift and the control chamber pressure when the piezo control valve or the valve needle is opened unintentionally, with such an unintentional opening of the piezo valve.
  • Control valve can be avoided or at least reduced by the invention.
  • FIG. 1 shows schematically a pump-nozzle unit.
  • the pump-nozzle unit shown for supplying fuel 10 into a combustion chamber 12 of an internal combustion engine has a fuel pump 14-22.
  • a fuel pump piston 14 can be moved back and forth in a fuel pump cylinder 16.
  • the fuel pump piston 14 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
  • the compression chamber of the fuel pump cylinder 16 forms a first pressure chamber 28.
  • the first pressure chamber 28 is connected to a piezo control valve 22 via a fuel line 20.
  • the piezo control valve 22 serves to either close the fuel line 20 or to connect it to a low-pressure fuel region 18 from which fuel 10 can be drawn.
  • the illustrated Pump-nozzle unit further comprises a fuel injection nozzle, designated overall by 24, which has a nozzle needle 46 that can be moved back and forth between a closed position and an open position.
  • a pressure pin 26 can in particular exert a downward force on the nozzle needle 46.
  • an adjusting disk 40 is provided, which is guided in a second pressure chamber 30 , fuel 10 in the second pressure chamber 30 having a second pressure p 30 being pressed downward via the pressure pin 26, based on the illustration in FIG directed closing force exerts on the nozzle needle 46.
  • the shim 40 is preferably only so strongly sealed to the second pressure chamber 30, that the second pressure p 3 is already dismantled o before beginning a new injection cycle.
  • a further closing force, also directed downward, is exerted by a first spring 36 on the pressure pin 26 and thus the nozzle needle 46, the first spring 36 being arranged in the second pressure chamber 30 and having its rear end supported on the adjusting disk 40.
  • a section of the nozzle needle 46 having a shoulder 44 is surrounded by a third pressure chamber 32, which communicates with the first pressure chamber 28 via a connecting line 42.
  • a third pressure p 32 is built up in the third pressure chamber 32 as a function of the throttling action of the connecting line 42 and, if appropriate, further throttling devices (not shown), depending on the first pressure p 28 prevailing in the first pressure chamber 28.
  • the nozzle needle 46 assumes its open position as long as there is a difference between the opening force caused by the third pressure p 32 and the sum of the closing force generated by the second pressure p 30 and that generated by the first spring 36
  • the Nozzle opening pressure can be influenced.
  • a pressure limiting and holding valve 34 can be provided between the first pressure chamber 28 and the second pressure chamber 30.
  • FIG. 2a shows a schematic partial sectional view of a piezo control valve 22, which closes in the flow direction from the high-pressure area to the low-pressure area and can be used with the pump-nozzle unit according to FIG. 1.
  • the piezo control valve 22 shown has a valve needle 48, which can be moved into the first end position shown for closing the piezo control valve 22 and into a second end position for completely opening the piezo control valve 22, which shifted to the right in relation to the illustration is.
  • a valve plate 64 provided on the valve needle 48 interacts with a valve seat 62 on the housing side.
  • the piezo control valve 22 has a piezo actuator or a piezo element 76. With suitable activation of the piezo element 76, this exerts a force on a pressure piece 54 via an end face 78. The pressure piece 54 in turn transmits the force generated by the piezo element 76 to a first lever 56 and a second lever 58, the first lever 56 and the second lever 58 being provided to effect a force transmission.
  • the first lever 56 and the second lever 58 abut a second axial end surface 72 of the valve needle 48 in order to transmit the translated force generated by the piezo element 76 to the valve needle 48.
  • the translated force generated by the suitably controlled piezo element 76, the acts on the valve needle 48 is greater than an opposite force generated by a second spring 66 and exerted on a first axial end face 70 of the valve needle 48 via a spring pressure piece 68.
  • the low-pressure fuel region 18 is connected to a control chamber 50, which is also connected via a compensating bore 52 to an actuator chamber 74 located in front of the piezo element 76. This actuator chamber 74 is connected to a return 60 via which fuel can flow back from the actuator chamber 74.
  • FIG. 2b shows a schematic partial sectional view of a piezo control valve 22 which closes in the opposite direction to the flow from the high pressure area to the low pressure area and which can also be used with the pump-nozzle unit according to FIG. 1. Due to the fact that the piezo control valve 22 shown in FIG. 2b closes in the opposite direction to the flow direction from the high pressure area to the low pressure area, this piezo control valve 22 ensures greater security against possible jamming.
  • the piezo control valve 22 shown in FIG. 2b also has a valve needle 48 which can be moved into the first end position shown for closing the piezo control valve 22 and into a second end position for fully opening the piezo control valve 22, which is related to the Representation of Figure 2b is shifted to the right.
  • valve needle 48 When the valve needle 48 is in its illustrated first end position, a valve plate 64 provided on the valve needle 48 interacts again with a valve seat 62 on the housing side. As a result, the low-pressure fuel region 18 or the control chamber 50 is closed off from a high-pressure chamber 38 which is connected to the fuel line 20 shown in FIG. 1.
  • the piezo control valve 22 again has a piezo actuator or a piezo element 76 which exerts a force on a second axial end face 72 of the valve needle 48 via an end face 78 and a pressure piece 54.
  • the piezo element 76 appropriately controlled The generated, translated force that acts on the valve needle 48 is greater than an opposite force that is also generated in this embodiment by a second spring 66 and is exerted on a first axial end surface 70 of the valve needle 48. Since the piezo control valve 22 shown in FIG. 2b, in contrast to the piezo control valve 22 shown in FIG. 2a, opens in the flow direction from the high pressure area 38 to the low pressure area 18 or to the control chamber 50, a high pressure present in the high pressure chamber 38 exerts an opening force on the valve needle 48, so that undesired jamming of this valve needle 48 can be avoided particularly safely.
  • Figure 3 shows an example of the course of the piezo drive current i (t) for closing the piezo control valve 22 according to the prior art, with analog control
  • Figure 4 shows a second example of the course of the piezo drive current i (t ) for closing the piezo control valve 22 according to the prior art, with CC control.
  • FIG. 5 shows a first embodiment of the actuation of the piezo actuator 76 according to the invention for closing the piezo control valve 22.
  • the current profile i (t) shown in FIG. 5 has a first current pulse Ii and a subsequent second current pulse I 2 spaced from it in time.
  • a partial current level I ⁇ is maintained between the first current pulse Ii and the second current pulse I 2 .
  • the continuous curve shape shown in FIG. 5 can be implemented in particular by an analog control.
  • the first current pulse I x , the second current pulse I 2 and the partial current level I ⁇ cause the charging process of the piezo Actuator thus divided into charge packets that have different charge contents.
  • FIG. 6 shows a second embodiment of the actuation of the piezo actuator 76 according to the invention for closing the piezo control valve 22.
  • the current profile i (t) shown in FIG. 6 also has a first current pulse Ii and a second current pulse I 2 that follows this at a distance in time on. In the embodiment shown in FIG. 6, no partial current level is maintained between the first current pulse Ii and the second current pulse I 2 .
  • the first current pulse Ii and the second current pulse I 2 are each composed of a plurality of immediately following short current pulses, as is the case in particular with CC control.
  • FIG. 7 shows a graph which shows the course of the piezo drive current i (t), the piezo voltage u (t), the valve needle stroke h (t), the high-pressure chamber pressure t 38 (t) and the pressure in the outlet region of the pump - Nozzle unit for a control according to the prior art and two control variants according to the invention illustrated, wherein FIG. 8 shows a temporal section of the curves of FIG. 7.
  • the curves which result in a control corresponding to the prior art are each designated a, the piezo drive current i (t) being shown inverted in this case.
  • curve b of the piezo drive current si (t) has a somewhat higher partial current level I ⁇ than curve c.
  • the system is strongly accelerated at the beginning by the first current pulse I ⁇ . No further energy is required in the middle range, at which the partial flow level I ⁇ is maintained. In order to generate a high closing force, the energy is increased again towards the end by the second current pulse I 2 (see area A of FIG. 7).
  • Activation in accordance with the curve profiles b or c results in lower pressure pulses (see area B in FIG. 7).
  • the cavitation time is reduced or a strong re-compression and a related reopening of the piezo control valve is even avoided (see area C of FIG. 7).
  • FIG. 9 shows a graph which illustrates the course of the piezo voltage u (t), the valve needle stroke h (t) and the control chamber pressure Pso (t) when the piezo control valve 22 or the valve needle 48 is opened unintentionally.
  • the piezo actuator 76 is provided with at least one first current pulse Ii and a second current pulse I 2 following this at intervals driven. A bouncer when the valve needle 48 hits the valve seat 62 can thereby be avoided or at least reduced. If necessary, a partial current level I ⁇ is maintained between the first current pulse Ii and the second current pulse I 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Selon l'invention, pour fermer la soupape de distribution piézoélectrique (22) d'une unité de pompe d'injection, l'actionneur piezoélectrique (76) est commandé au moyen d'au moins une première impulsion de courant (I1) ainsi que d'une seconde impulsion de courant (I2) espacée de la première impulsion de courant par un intervalle temporel, et non à l'aide d'un paquet de courant à impulsions uniques. Ceci permet d'éviter l'apparition d'une impulsion rebondissante au moment où l'aiguille de soupape (48) rencontre le siège de soupape (62), ou au moins de réduire cette impulsion rebondissante. Un niveau de courant partiel (IT) est éventuellement maintenu entre la première impulsion de courant (I1) et la seconde impulsion de courant (I2).
EP03727149A 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection Expired - Lifetime EP1488089B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10214206 2002-03-28
DE10214206 2002-03-28
PCT/DE2003/000956 WO2003083278A1 (fr) 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection

Publications (2)

Publication Number Publication Date
EP1488089A1 true EP1488089A1 (fr) 2004-12-22
EP1488089B1 EP1488089B1 (fr) 2005-12-21

Family

ID=28458472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03727149A Expired - Lifetime EP1488089B1 (fr) 2002-03-28 2003-03-21 Procede et dispositif de commande de l'actionneur piezoelectrique de la soupape de distribution piezoelectrique d'une unite de pompe d'injection

Country Status (3)

Country Link
EP (1) EP1488089B1 (fr)
DE (1) DE50301997D1 (fr)
WO (1) WO2003083278A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2272169C2 (ru) * 2004-04-27 2006-03-20 Московский государственный открытый университет (МГОУ) Форсунка с электрическим управлением для подачи топлива в двигатель внутреннего сгорания
DE102004062073B4 (de) * 2004-12-23 2015-08-13 Continental Automotive Gmbh Verfahren und Vorrichtung zur Kompensation von Prelleffekten in einem piezogesteuerten Einspritzsystem einer Verbrennungskraftmaschine
DE102005040530B3 (de) * 2005-08-26 2006-12-21 Siemens Ag Verfahren und Vorrichtung zum Ansteuern eines Ventils
DE102005046933B4 (de) * 2005-09-30 2015-10-15 Continental Automotive Gmbh Verfahren zum Ansteuern eines piezobetätigten Einspritzventils
DE102010040306B4 (de) 2010-09-07 2020-06-25 Continental Automotive Gmbh Verfahren zur Ansteuerung eines Piezoinjektors eines Kraftstoffeinspritzsystems
DE102013224385B3 (de) 2013-11-28 2015-03-12 Continental Automotive Gmbh Verfahren zum Betreiben eines Injektors eines Einspritzsystems einer Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371469B1 (fr) * 1988-11-30 1995-02-08 Toyota Jidosha Kabushiki Kaisha Appareil pour actionner un élément piézo-électrique servant à ouvrir ou fermer une partie d'une vanne
DE19921456A1 (de) * 1999-05-08 2000-11-16 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung eines piezoelektrischen Aktors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03083278A1 *

Also Published As

Publication number Publication date
DE50301997D1 (de) 2006-01-26
EP1488089B1 (fr) 2005-12-21
WO2003083278A1 (fr) 2003-10-09

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