EP1432901B1 - Verfahren, computerprogramm und steuer- und/oder regelgerät zum betreiben einer brennkraftmaschine, sowie brennkraftmaschine - Google Patents

Verfahren, computerprogramm und steuer- und/oder regelgerät zum betreiben einer brennkraftmaschine, sowie brennkraftmaschine Download PDF

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Publication number
EP1432901B1
EP1432901B1 EP02767102A EP02767102A EP1432901B1 EP 1432901 B1 EP1432901 B1 EP 1432901B1 EP 02767102 A EP02767102 A EP 02767102A EP 02767102 A EP02767102 A EP 02767102A EP 1432901 B1 EP1432901 B1 EP 1432901B1
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EP
European Patent Office
Prior art keywords
fuel
internal combustion
combustion engine
mass flow
piezoelectric actuator
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
EP02767102A
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German (de)
English (en)
French (fr)
Other versions
EP1432901A1 (de
Inventor
Klaus Joos
Jens Wolber
Thomas Frenz
Markus Amler
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
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1432901A1 publication Critical patent/EP1432901A1/de
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Publication of EP1432901B1 publication Critical patent/EP1432901B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2432—Methods of calibration
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors

Definitions

  • the invention firstly relates to a method for operating an internal combustion engine, in which the fuel is injected directly into at least one combustion chamber via at least one fuel injection device, whose valve element is moved by a piezoactuator, and in which the torque is determined, which is determined during combustion the amount of fuel injected during an injection into the combustion chamber is generated.
  • cylinder equalization In order to ensure the best possible smoothness and to optimize the emission behavior of the internal combustion engine, a so-called "cylinder equalization" is performed in the known method. In this case, for each cylinder of the internal combustion engine within a power stroke (two revolutions of the crankshaft), the torque generated in the singular combustion in the respective combustion chamber is determined. The opening times of the injectors are then changed so that the torque differences between the individual cylinders are minimal. In this way, manufacturing tolerances between the individual injectors can be compensated.
  • the present invention has the object, a method of the type mentioned in such a way that manufacturing differences between individual injectors are considered even better. Also, the aging behavior of the injectors should be considered. All this should be done so that neither the emission behavior nor the fuel consumption of the internal combustion engine are deteriorated.
  • a current valve characteristic of the built-in internal combustion engine fuel injector is at least approximately determined, the valve characteristic a fuel mass flow to be delivered by the fuel injector , linked to a drive to be supplied to the piezoelectric actuator.
  • the invention has the advantage that the current valve characteristic of each individual fuel injection device of the internal combustion engine is known.
  • a valve characteristic establishes a relationship between the amount of fuel that is to be discharged from the fuel injector and the drive energy to be supplied thereto to the piezoactuator. Since the valve characteristic curve is currently determined, it takes into account the individual parameters of the piezoactuator, such as age-related wear, and also parameters of the individual injection device, such as a change in the permeability of the outlet openings.
  • the adaptation does not take place by an extension or a shortening of the injection duration of the fuel injection device, but by a change in the stroke of the piezoelectric actuator and thus the flow velocity of the fuel at the exit from the fuel injection device.
  • the stroke of the piezoelectric actuator depends on the energy that is supplied to the piezoelectric actuator.
  • the injected fuel amount is smaller or larger.
  • the stroke of the piezoelectric actuator can be set very precisely.
  • the duration of injection ie the time of commencement of the injection and the time of the end of the injection, can be selected exclusively with regard to optimum combustion with optimum emission and consumption behavior.
  • the invention also has the advantage that an age-related wear of the piezoelectric actuator can be effectively compensated. This is achieved by the fact that the valve characteristic is always largely current.
  • the term "current" does not mean that the individual valve characteristic curve has to be determined constantly. The determination of the valve characteristic should be carried out so that age-related wear can be detected as well as possible.
  • the method comprises the following steps:
  • valve characteristics or a whole family of valve characteristics it is possible for a plurality of valve characteristics or a whole family of valve characteristics to be stored in a memory. Since the usual valve characteristics, which form the relationship between the fuel quantity to be injected and the driving energy required for this purpose, do not overlap, an unambiguous assignment of the most suitable function is already possible reliably only in the presence of a single value pair.
  • the valve characteristics stored in the memory were previously determined by tests. They cover the commonly occurring aging and wear influences as well as manufacturing tolerances.
  • this method can be performed only in the stratified operation of the internal combustion engine. This is due to the fact that there is a direct relationship between the torque resulting from an individual injection and the injected fuel quantity only in stratified operation. It understands but also that the determined valve characteristic can also be used in a "homogeneous operation" of the internal combustion engine and there leads to the advantages of the invention. In this fuel is largely homogeneous in the combustion chamber, and the torque also depends on the supplied air mass, which is usually adjusted by the position of a throttle.
  • the drive voltage of the piezoelectric actuator is reduced from a value above a voltage at which the valve element associated with the piezoactuator is in a position in which the fuel mass flow of the fuel is predominantly determined by seat throttling, and at the same time the torque which is based on the injections made during the reduction of the driving voltage, is monitored, and that when the torque decreases by at least a certain value, the value pair consisting of fuel mass flow and driving energy is formed.
  • Yet another possibility for carrying out the method is that at different operating points of the internal combustion engine value pairs, which consist of driving energy and fuel mass flow, are determined, and that a standard function, in particular an exponential function, which Fuel mass flow, which is to be delivered by the fuel injection device, linked to a piezoelectric actuator to be supplied drive energy, is adapted to this plurality of value pairs.
  • a standard function in particular an exponential function, which Fuel mass flow, which is to be delivered by the fuel injection device, linked to a piezoelectric actuator to be supplied drive energy, is adapted to this plurality of value pairs.
  • the adaptation takes place according to the least squares method.
  • the deviations of the adjusted standard function from the actual value pairs are kept as small as possible.
  • the value pairs are formed by a change in the driving energy. It is particularly preferred if the drive energy is changed in each case stepwise. Thus, after a change in the drive energy, the conditions in the internal combustion engine initially stabilize, which increases the precision in the determination of the value pairs.
  • the method be carried out cyclically at certain predetermined time intervals. Aging and wear on the fuel injection device or on the piezoelectric actuator of the fuel injection device can thus be considered reliably over the entire life of the fuel injection device.
  • time intervals By a corresponding definition of the time intervals, it is also ensured that the deviation of the current characteristic of a fuel injection device from the last determined characteristic never exceeds a certain level.
  • time interval can be understood to mean a real operating time or even a number of actuations of the fuel injection device.
  • the invention also relates to a computer program suitable for carrying out the above method when executed on a computer. It is particularly preferred if the computer program is stored on a memory, in particular on a flash memory or a ferrite RAM.
  • the invention relates to a control and / or regulating device for operating an internal combustion engine.
  • it is particularly preferred if it comprises a memory on which a computer program of the above type is stored.
  • the invention also relates to an internal combustion engine having at least one combustion chamber, with at least one fuel injection device, which comprises a piezoelectric actuator and via which the fuel passes directly into the combustion chamber, and with a device with which the torque can be determined, which is generated in the combustion of the injected into an injection in the combustion chamber fuel amount.
  • the internal combustion engine comprises a control and / or regulating device of the above type.
  • An internal combustion engine carries in FIG. 1 in its entirety the reference numeral 10. It comprises a plurality of combustion chambers, of which only one is shown in FIG. 1 with the reference numeral 12. It is fed combustion air from a suction pipe 14 via an inlet valve 16. The combustion exhaust gases pass through an exhaust valve 18 into an exhaust pipe 20.
  • Fuel is injected into the combustion chamber 12 directly via a fuel injector 22.
  • This is an injector whose valve element (not shown) by a piezoelectric actuator (not shown) is moved.
  • the injector 22 is connected to a fuel system 24. This provides the injector 22 with the fuel under very high pressure.
  • the fuel-air mixture in the combustion chamber 12 is ignited by a spark plug 26, which is connected to an ignition system 28.
  • the rotational speed of a crankshaft 30 and its angular position and angular accelerations are tapped by a sensor 32.
  • the corresponding signals are fed to a control and regulating device 34.
  • the control and regulating device 34 controls, inter alia, the injector 22.
  • FIG. 2 A stroke throttle curve of the injector 22 is shown in Fig. 2: From this it can be seen that the fuel mass flow Qstat rises steeply in a first region of the stroke h (Hubdroshnereich 36), whereas it is in the further course of the stroke h of the valve element of the injector 22 practically no longer increased (seat throttle area 38).
  • the Hubdroshnereich 36 is particularly important because nowadays large amounts of fuel are introduced by a plurality of Kleinsteinspritzept. In these injector 22 opens only slightly. It thus essentially remains in the Hubdroshnereich 36.
  • the characteristic curve not only establishes a relationship between the drive voltage U of the piezoactuator of the injector 22 with the fuel Mass flow Qstat but also between the drive voltage U and the torque M produced.
  • the internal combustion engine 10 of FIG 4 (this method is stored as a computer program in the control unit 34):
  • a query is made in block 42 as to whether internal combustion engine 10 is currently operating in stratified mode. This query is necessary because only in stratified operation a direct relationship between the torque M and the fuel mass flow Qstat is given. Only this direct relationship, as explained below, makes it possible to determine the quantities required for the compensation of said deviations.
  • a block 44 it is queried whether a check of the characteristics of the injectors 22 is due. Such a check is not always necessary, but only at certain cyclic intervals. If the answer in block 44 is "yes", a query is made in block 46 as to whether the drive voltage U is greater than a limit value G1. This ensures that the internal combustion engine 10 is at an operating point in which the valve element of the injector 22 assigned to the piezoactuator is in a position in which the fuel mass flow Qstat is predominantly determined by seat throttling.
  • the limit value G1 is also shown in FIG. 5, the seat throttling area is located to the right of the corresponding dashed line.
  • the drive voltage U is now gradually reduced.
  • the corresponding torque M also drops when the drive voltage U is reduced.
  • this torque drop dM exceeds a limit value G2.
  • This torque is designated MG2 in FIG. From this torque MG2 now the corresponding fuel mass flow QstatG2 is determined. From the drive voltage UG2, with which the injection was effected, which led to the torque MG2, and from the fuel mass flow QstatG2 now a pair of values is formed.
  • QstatG2 would be such that the valve characteristic fe would be the closest, an entry would also be made in an error memory and a message would be output to the user. This may be, for example, that on the dashboard of a motor vehicle, in which the internal combustion engine 10 is installed, a warning lamp lights up.
  • the valve characteristic fe means that the fuel injection device 22 has aged so much that a drive energy is required to deliver a certain mass flow of fuel which is above a threshold (this threshold is not shown in FIG. 5) ) Shown. The user and a person performing the maintenance of the engine are thus notified of the condition of the corresponding fuel injection device. At the same time, however, it remains ensured that the fuel mass flow can be controlled or regulated in the desired manner.
  • FIG. 6 shows a second exemplary embodiment of a method with which the internal combustion engine of FIG. 1 can be operated.
  • FIG. 6 shows a second exemplary embodiment of a method with which the internal combustion engine of FIG. 1 can be operated.
  • those blocks which have equivalent functions to blocks of Fig. 4 bear the same reference numerals. They are not explained again in detail.
  • the characteristic corresponding to the current state of the fuel injection device 22 is not selected from a previously established plurality of characteristics, but is specifically prepared for the fuel injection device 22 in question. This happens because when the internal combustion engine 10, the drive voltage U of the fuel injection device 22 is increased gradually. About the corresponding torque Mi, the associated fuel mass flows Qstati are determined.
  • a value pair series Ui, Qstati is created.
  • a function f (U, Qstat) is formed (block 60) which links a fuel mass flow Qstat, which is to be output by the fuel injection device 22, to a drive energy U to be supplied to the piezoactuator.
  • the linking can be done by a linear interpolation. It will be understood that the method illustrated in FIGS. 6 and 7 does not operate during normal operation
  • the internal combustion engine 10 may be performed, but must be performed, for example, during a maintenance stay.
  • data pairs Ui drive voltage
  • Qstati fuel mass flow
  • each of the above-described methods is performed for each individual cylinder or fuel injector 22.
  • the detection of the torque generated by the combustion of the fuel injected in the combustion chamber 12 is made by measuring the acceleration of the crankshaft 30 caused by this combustion.
  • the acceleration of the crankshaft 30 is also determined from the signal of the sensor 32.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP02767102A 2001-09-27 2002-08-16 Verfahren, computerprogramm und steuer- und/oder regelgerät zum betreiben einer brennkraftmaschine, sowie brennkraftmaschine Expired - Lifetime EP1432901B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10147814 2001-09-27
DE2001147814 DE10147814A1 (de) 2001-09-27 2001-09-27 Verfahren, Computerprogramm und Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschine, sowie Brennkraftmaschine
PCT/DE2002/002995 WO2003031787A1 (de) 2001-09-27 2002-08-16 Verfahren, computerprogramm und steuer- und/oder regelgerät zum betreiben einer brennkraftmaschine, sowie brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1432901A1 EP1432901A1 (de) 2004-06-30
EP1432901B1 true EP1432901B1 (de) 2006-11-22

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EP02767102A Expired - Lifetime EP1432901B1 (de) 2001-09-27 2002-08-16 Verfahren, computerprogramm und steuer- und/oder regelgerät zum betreiben einer brennkraftmaschine, sowie brennkraftmaschine

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EP (1) EP1432901B1 (ja)
JP (1) JP4235552B2 (ja)
DE (2) DE10147814A1 (ja)
WO (1) WO2003031787A1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10256240A1 (de) * 2002-12-02 2004-06-09 Robert Bosch Gmbh Verfahren zur Steuerung eines Kraftstoffzumeßsystems einer Brennkraftmaschine
DE10323488B4 (de) * 2003-05-23 2011-08-11 Robert Bosch GmbH, 70469 Verfahren und Vorrichtung zur betriebspunktabhängigen Steuerung von Injektoren eines Kraftstoffzumesssystems einer Brennkraftmaschine
EP1526267A3 (de) 2003-10-21 2010-07-28 Continental Automotive GmbH Verfahren zur Driftkompensation eines Injektors für die direkte Kraftstoffeinspritzung in einen Zylinder einer Brennkraftmaschine sowie Vorrichtung
DE10349579B4 (de) * 2003-10-24 2013-01-03 Robert Bosch Gmbh Verfahren und Steuergerät zum Steuern eines Startvorganges einer Brennkraftmaschine
DE102004054372B3 (de) * 2004-11-10 2006-06-14 Siemens Ag Verfahren und Vorrichtung zum Bestimmen eines Kraftstoffmassenstroms bei einer Brennkraftmaschine
DE102005004442B4 (de) 2005-01-31 2006-11-16 Siemens Ag Verfahren und Vorrichtung zum Steuern einer Brennkraftmaschine
DE102006027823B4 (de) 2006-06-16 2008-10-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Anpassen der Ventilcharakteristik eines Kraftstoff-Einspritzventils
DE102006050171A1 (de) * 2006-10-25 2008-04-30 Robert Bosch Gmbh Verfahren zur Bestimmung eines Kennfeldes der Einspritzmenge über einer elektrischen Größe eines elektrisch angesteuerten Einspritzventils
FR2917463A3 (fr) * 2007-06-12 2008-12-19 Renault Sas Procede de reduction des derives et des dispersions des injecteurs d'un moteur
DE102008006674B4 (de) * 2008-01-30 2020-08-27 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Brennkraftmaschine mit Benzin-Direkteinspritzung
DE102010027806B4 (de) * 2010-04-15 2024-01-18 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine, bei dem eine Größe ermittelt wird
DE102012209965A1 (de) * 2012-06-14 2013-12-19 Robert Bosch Gmbh Verfahren zum Betreiben eines Ventils

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
JP2767959B2 (ja) * 1990-02-27 1998-06-25 日産自動車株式会社 ディーゼルエンジンの燃料噴射装置
DE19652807C2 (de) * 1996-12-18 2002-08-29 Siemens Ag Verfahren und Vorrichtung zum Ansteuern eines kapazitiven Stellgliedes
DE19652801C1 (de) * 1996-12-18 1998-04-23 Siemens Ag Verfahren und Vorrichtung zum Ansteuern wenigstens eines kapazitiven Stellgliedes
JP3855473B2 (ja) * 1998-07-08 2006-12-13 いすゞ自動車株式会社 コモンレール式燃料噴射装置
DE19845037C2 (de) * 1998-09-30 2000-11-30 Siemens Ag Verfahren und Anordnung zum Ansteuern eines kapazitiven Aktors
DE19931233B4 (de) * 1999-07-07 2007-02-01 Siemens Ag Verfahren zum Ansteuern eines kapazitiven Stellgliedes
DE19936944A1 (de) * 1999-08-05 2001-02-08 Bosch Gmbh Robert Verfahren zum Zumessen von Brennstoff mit einem Brennstoffeinspritzventil

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Publication number Publication date
EP1432901A1 (de) 2004-06-30
JP4235552B2 (ja) 2009-03-11
DE50208805D1 (de) 2007-01-04
DE10147814A1 (de) 2003-05-08
WO2003031787A1 (de) 2003-04-17
JP2005504912A (ja) 2005-02-17

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