EP1167745A1 - Procédé pour faire fonctionner un injecteur/ système d'injection - Google Patents

Procédé pour faire fonctionner un injecteur/ système d'injection Download PDF

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Publication number
EP1167745A1
EP1167745A1 EP00113993A EP00113993A EP1167745A1 EP 1167745 A1 EP1167745 A1 EP 1167745A1 EP 00113993 A EP00113993 A EP 00113993A EP 00113993 A EP00113993 A EP 00113993A EP 1167745 A1 EP1167745 A1 EP 1167745A1
Authority
EP
European Patent Office
Prior art keywords
injection
control
closure member
valve
closing
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.)
Withdrawn
Application number
EP00113993A
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German (de)
English (en)
Inventor
Rueger Johannes-Jorg
Mrosik Matthias
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
Priority to EP00113993A priority Critical patent/EP1167745A1/fr
Publication of EP1167745A1 publication Critical patent/EP1167745A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure

Definitions

  • the invention relates to a method for operating a Fuel injector, one in one Closing position as a starting position Closing member first in a control parameter an opening position and subsequently in one of a Number of closing positions selected target position brought. It continues to refer to Fuel injection system with a number of Injectors, one in each Closing position as a starting position Closing member first in a control parameter an opening position and subsequently in one of a Number of target positions that can be selected is feasible.
  • An essential component can be in a Internal combustion engine for a fuel injection system Introducing the fuel into the combustion chambers of the cylinders are used.
  • a fuel injection system typically includes a number of injectors that individually or in the manner of a so-called common rail system (CR-Systems) via a central Supply system can be fueled.
  • CR-Systems common rail system
  • each injector is typically in an associated injector integrated, via the fuel injection in a predeterminable manner is adjustable.
  • the injection valves usually include each a closing link and can be used as a simple switching or be designed as double-switching valves.
  • a single-switching valve is one for the closing member Opening position provided in which there is an active channel releases, and a closed position, for example a Valve seat in which it closes the active channel.
  • a double-switching valve also shows alternatively to the opening position for the closure member controllable closing positions, for example valve seats, on.
  • a double switching fuel injector for the Fuel injection into the combustion chamber Internal combustion engine with a high pressure system or CR system is known from DE 197 328 02.
  • This injector has a closure member, which is in one of two alternative valve seats each in a closed position is located and thereby closing the injection nozzle causes. In a middle position between the two The closing member, on the other hand, takes one Open position.
  • the piezoelectric actuator is set to a Control voltage charged by the pressure in the common rail system is dependent. Stretches due to the control voltage the actuator extends in the longitudinal direction. This linear expansion is connected to the system via a hydraulic coupler Transfer closure member, so that on the one hand that of the actuator Generatable stroke is amplified and on the other hand Closure member of a possible static Thermal expansion of the actuator is decoupled.
  • a charge of the piezoelectric actuator thus causes the hydraulic coupler a transfer of the closing member first from the first closed position to the Open position and then from the open position to the second closed position.
  • discharging the piezoelectric actuator due to the associated Longitudinal contraction using the hydraulic coupler a transfer of the closure member initially from the second closed position in the open position and then from the open position to the first closed position.
  • the internal combustion engine For the proper functioning of the The internal combustion engine is the injection for each cylinder the correct or required amount of fuel to scheduled time, based on the injection cycle overall, required.
  • the injection of the The amount of fuel can be within one injection cycle also distributed over several partial injections, for example two pre-injections and one main injection. Especially with such a multi-stage injection for a high efficiency of the internal combustion engine largely exact compliance with the (partial) injection quantities desirable.
  • the invention is therefore based on the object Method for operating an injection valve for Specify fuel of the type mentioned above with a view to on a particularly precise compliance with a given Injection quantity for use double or multi-switching valves is particularly suitable. moreover is said to be particularly useful for performing the procedure suitable fuel injection system can be specified.
  • this object is achieved according to the invention solved by the influencing the closure member Control parameters depending on the starting position and is selected from the target position of the closure member.
  • the invention is based on the consideration that for a especially with regard to the specified injection quantity reliable fuel injection of the closure member influencing control parameters current conditions in the Injection system should take into account.
  • the switching direction indicates an opening or injection phase of the injection valve, in which closed position as Target position the closure member starting from which Closing position is transferred as the starting position.
  • a double-switching valve which as a first valve seat first closed position and a second valve seat as has second closed position, so result as Possible switching senses: 1. a circuit from the first Valve seat as the starting position in the first valve seat as Target position, 2. a circuit from the first to the second Valve seat, 3. a shift from the second to the first Valve seat, and 4. a circuit from the second to the second Valve seat.
  • valve seat the closure member from Is brought open position and in which valve seat the closing member is then transferred for closing becomes. Due to the design of this double-switching valve prevails in the limited by the two valve seats Valve chamber a pressure drop. Every movement of the Closing member from a closed position in the Opening position or vice versa is thus against the or with the pressure drop. In other words, depending Direction of movement of the closure member becomes its movement supported or hindered by the prevailing pressure drop. The characteristic of the valve is therefore asymmetrical with respect to those defined by the valve seats Closing member closing positions. This asymmetry is now used when selecting the control parameter considered.
  • Control parameters when selecting the Control parameters further for the injection behavior relevant characteristics, especially the number the previous one within the same injection cycle Injections and / or operationally relevant data with Internal combustion engine fueled.
  • the Taking into account the number of in the same injection cycle previous injections is advantageous because thereby influences of injection quantity due to the previous one Injections can be compensated.
  • Number of previous injections come in With regard to current injection cycles, especially in Consideration: no pre-injection, i.e. H. the one to be made Injection is the first of the current injection cycle, one pilot injection or two pilot injections. From the pre-injections resulting Injection quantity influences can, for example, due to Pressure fluctuations due to the pre-injection occur.
  • operationally relevant data are also preferably the injection pressure and / or the speed of the Internal combustion engine considered.
  • Every map includes in the manner of a family of curves a number of Selection curves in which, for example, the depending from a first operating parameter, e.g. B. the engine speed, Control parameters to be selected depending on one serving as share parameters second operating parameters, for. B. the injection pressure is detected.
  • a first operating parameter e.g. B. the engine speed
  • Control parameters to be selected depending on one serving as share parameters second operating parameters for. B. the injection pressure is detected.
  • the method is expediently based on an injection valve applied, in which the closure member by means of a piezoelectric actuator is driven.
  • a control parameter Control duration for the piezoelectric actuator in the selected way selected is included denotes the period of time between two Control interventions on the actuator elapse. This can for example, depending on the operating point, the time span between the start of a charging process and the beginning a discharge process of the actuator.
  • the above Task solved by providing a control unit that for each injector its closing member influencing control parameters depending on its Starting position and from its target position.
  • the fuel injection system includes advantageously injectors, the closing member each can be driven by means of a piezoelectric actuator is.
  • the control unit expediently gives one Control duration for the piezoelectric actuator as Control parameters.
  • this Fuel injection system also has a memory module in that for each of the possible switching senses, i.e. for each of the can be generated from all possible closing positions Combinations of starting position and target position, each a map for the control parameter as a data record is deposited.
  • the injection valve 1 according to FIG. 1 has one piezoelectric actuator 2, which has a number of Piezo elements 4 connected in series comprises.
  • the Actuator 2 is on the one hand with a housing wall 6 through which Terminals 7 of the actuator 2 are passed, and on the other hand with a control piston 8 non-positively connected.
  • the actuating piston 8 closes with its actuator 2 end face 9 facing away from a hydraulic coupler 10.
  • the hydraulic coupler 10 in turn acts on one in a connecting channel 12 guided adjusting piston 14 whose end facing away from the coupler 10 is a closing member 16 is arranged. This is as a double closing Control valve designed. It closes in a first Closed position, which is a rest position of the actuator 2 corresponds to a first valve seat 18 of a valve chamber 20.
  • Valve chamber 20 Via a passage in the second valve seat 22 is the Valve chamber 20 connected to a guide channel 24, the not on the input side via a connector 26 to one shown pressure channel of a common rail fuel supply system a motor vehicle connected.
  • guide channel 24 In the guide channel 24 is a nozzle needle 28 arranged that a fuel outlet 30 one of Connection piece 26 branching fuel channel 32 dependent from one via the connecting terminals 7 to the actuator 2 applied control voltage Ua releases or closes.
  • the connector 26 For setting functional pressure conditions at Operation of the injector 1 are the connector 26 with an inlet throttle 34 and the guide channel 24 with a Flow restrictor 36 provided.
  • the injection valve 1 is, together with others Injectors 1, part of a fuel injection system 40, as shown schematically in Figure 2. there are the injection valves 1, of which in Figure 2 the For the sake of clarity, only four are shown, on the fuel side to a common supply line 42 connected. The number of for that Fuel injection system 40 provided injection valves 1 depends on the other requirements of the supplying internal combustion engine, in particular can Injector 1 for each cylinder to be fed be provided.
  • a central Control unit 44 For electrical control of the injection valves 1 includes the fuel supply system 40 a central Control unit 44. This in turn has a control module 46 on that via lines 48 to the terminals 7 of the Injector 1 is connected to be switched off.
  • the control unit 44 has a data storage module 50, in which a number of maps K is stored.
  • the Control unit 44 When operating the fuel supply system 40, the Control unit 44 in an injection cycle over the Control module 46 a control voltage Ua to the Terminals 7 of each injector 1.
  • the Actuator 2 of the controlled injection valve 1 In its Longitudinal direction, so that the adjusting piston 8 in the direction of the hydraulic coupler 10 moves.
  • Adjusting piston 14 with the closure member 16 arranged thereon towards the opening position in the middle of the Valve chamber 20 and with a further increase in Control voltage Ua to the second valve seat 22.
  • each injector 26 has a high pressure at one Common rail system, for example, between 200 and 1800 bar can be. This pressure acts against the nozzle needle 28 and keeps it closed so that through the fuel spout 30 no fuel can leak. But if now as a result of the control voltage Ua applied to the actuator 2 Closure member 16 in the area of the open position is moved, then the pressure builds up in the high pressure area of the guide channel 24, so that the nozzle needle 28 in Direction back to the valve chamber 20 and the Fuel outlet 30 releases. In this case there is a Fuel injection into the associated cylinder.
  • control voltage Ua for one of the Injectors 1 as a function of time is exemplary shown for an injection cycle in Figure 3.
  • the control voltage Ua becomes 0 V (corresponding to the rest position of the actuator 2; the Closing member is thus in the first valve seat 18) starting at an intermediate level, for example about 75 V can be continuously increased.
  • the control voltage Ua reaches the intermediate level, the corresponds to an average linear expansion of the actuator 2 (The closure member 16 is thus in the Opening position approximately in the middle of the valve chamber 20). In In this state, fuel is thus injected through the injector under consideration 1.
  • the control voltage Ua is reduced again until it closes reached the value 0 V at a time t4.
  • the closure member 16 is again from the open position into that defined by the first valve seat 18 Closed position transferred so that the injection ends becomes.
  • the switching direction of the first closed position as the starting position and as Target position for the closure member 16 is given.
  • Another injection or second pre-injection begins at time t5 with a further increase in Control voltage Ua from 0 V to the intermediate level of about 75 V, which is reached at time t6.
  • the This injection ends at time t7 initiated from which to the drive voltage Ua even further is increased until it reaches a maximum value at a time t8 of about 150 V, for example.
  • This will make it Closure member 16 from the open position in the through the second valve seat 22 transferred to the defined closed position.
  • the switching direction of this injection is thus through the first Closing position as the starting position and the second Closing position defined as target position.
  • the Drive voltage Ua finally at time t9 from Maximum value corresponding to the opening position Maximum value corresponding to the opening position Intermediate level lowered, that at time t10 reached.
  • This intermediate level can also be opened of the closure member 16 taken at time t6 Deviate intermediate level and for example about 70V be.
  • the Control voltage Ua starting at time t11, still further reduced until it returns to the value at time t12 reached from 0 V. Accordingly, the switching sense is the Main injection through the second closed position as Starting position and through the first closed position as Given target position.
  • Each of the three provided within the injection cycle Injections are characterized in that the Closing member 16 is first in one of the Closing positions as the starting position is located from the then first in the open position and then after a reasonable wait again in one of the Closing positions is brought as the target position.
  • the Transfer to the opening and the target position effected by applying the control voltage Ua, wherein this in turn taking into account a triggering period Ta applied to the respective actuator 2 as a control parameter becomes.
  • the closure member 16 is based on the control duration Ta in the open position and from there in brought the target position.
  • the control duration Ta is in the exemplary embodiment defined as the amount of time between triggering the Valve opening and triggering of the valve closure passes. This is the time span for the first pilot injection between times t3 and t1, for the second Pre-injection the time span between the times t7 and t5, and the time for the main injection between times t11 and t9.
  • the control duration Ta is essentially through that period of time given in which the respective injection valve 1 opened is, so that an injection takes place.
  • the control module 46 of the control unit 44 is of this type designed to be the choice of one for injection control period to be provided as a control parameter under A number of parameters are taken into account.
  • the selection is made taking into account the Switching direction of the injection valve at the respective Injection.
  • for the selection of the Driving time Ta for the injection to be carried out takes into account in which closed position as Starting position the closure member before the start of Injection is, and in what closed position that Closing member transferred after the end of the injection shall be. This takes into account the knowledge that due to the design of the injector 1 in the the two valve seats 18, 22 a limited valve space 20 There is a pressure drop.
  • Every movement of the closing member 16 from a closed position to the open position or vice versa thus takes place against or with the pressure drop, so that the behavior of the injector 1 and thus also the result in terms of actually injected Quantity of the direction of movement of the closure member 16 depends.
  • control duration Ta As Control parameters operational data of the Internal combustion engine, such as its speed and / or the Fuel injection system 40 prevailing injection pressure, considered. To also by successive Injections caused by To compensate for pressure fluctuations, the choice of Activation duration Ta also the number of times within injections preceding the same injection cycle, that is, in the exemplary embodiment for the first pilot injection none, one for the second pilot injection and one for the Main injection two, taken into account.
  • the selection of the control period Ta is made with reference to maps K. stored in the data storage module 50 Map K is given by a family of curves in which the control duration Ta with the speed of the internal combustion engine as share parameters as a function of the im Fuel injection system 40 prevailing injection pressure is captured.
  • the maps K can be based on previous calibrations have been created.
  • in the Data storage module 50 is for everyone for each Injector 1 possible switching sense for each number of possible pre-injections each have a map K deposited.
  • the two Pre-injections precede and their switching direction by the second closed position as the starting position and through the the first closing position is given as the target position for this combination of the boundary conditions in the data storage module 50 stored map K used. From this map K that curve is determined whose share parameters are the speed currently measured for the internal combustion engine on next comes. This curve becomes the current one prevailing injection pressure intended control period Ta derived.
  • the drive duration Ta selected in this way is used for the Control of injector 1 as a control parameter based on. This ensures that the specified injection quantity regardless of the switching direction of the Injection valve 1 are observed comparatively accurately can, although those prevailing in the valve chamber 20 Pressure conditions a dependency of the valve characteristics depend on the direction of movement of the closure member 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP00113993A 2000-07-01 2000-07-01 Procédé pour faire fonctionner un injecteur/ système d'injection Withdrawn EP1167745A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00113993A EP1167745A1 (fr) 2000-07-01 2000-07-01 Procédé pour faire fonctionner un injecteur/ système d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00113993A EP1167745A1 (fr) 2000-07-01 2000-07-01 Procédé pour faire fonctionner un injecteur/ système d'injection

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EP1167745A1 true EP1167745A1 (fr) 2002-01-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486587B2 (en) * 1999-01-29 2002-11-26 Daimlerchrysler Ag Device for controlling a piezoelement injection valve
DE102006051439A1 (de) * 2006-10-31 2008-05-08 Siemens Ag Verfahren zur Steuerung einer Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413076A (en) * 1993-04-08 1995-05-09 Robert Bosch Gmbh Fuel injection system for internal combustion engines
DE19716220A1 (de) * 1997-04-18 1998-10-22 Bosch Gmbh Robert Kraftstoffeinspritzeinheit für Brennkraftmaschinen
DE19732802A1 (de) 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
EP0908617A1 (fr) * 1997-10-10 1999-04-14 Robert Bosch Gmbh Dispositif d'injection de combustible
WO2000023704A1 (fr) * 1998-10-16 2000-04-27 International Truck And Engine Corporation Injecteur de carburant avec commande directe de la soupape a pointeau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413076A (en) * 1993-04-08 1995-05-09 Robert Bosch Gmbh Fuel injection system for internal combustion engines
DE19716220A1 (de) * 1997-04-18 1998-10-22 Bosch Gmbh Robert Kraftstoffeinspritzeinheit für Brennkraftmaschinen
DE19732802A1 (de) 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
EP0908617A1 (fr) * 1997-10-10 1999-04-14 Robert Bosch Gmbh Dispositif d'injection de combustible
WO2000023704A1 (fr) * 1998-10-16 2000-04-27 International Truck And Engine Corporation Injecteur de carburant avec commande directe de la soupape a pointeau

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486587B2 (en) * 1999-01-29 2002-11-26 Daimlerchrysler Ag Device for controlling a piezoelement injection valve
DE102006051439A1 (de) * 2006-10-31 2008-05-08 Siemens Ag Verfahren zur Steuerung einer Brennkraftmaschine
DE102006051439B4 (de) * 2006-10-31 2009-01-29 Continental Automotive Gmbh Verfahren zur Steuerung einer Brennkraftmaschine

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