EP3014093B1 - Method for determining the absolute injection quantity in an internal combustion engine and arrangement therefor - Google Patents
Method for determining the absolute injection quantity in an internal combustion engine and arrangement therefor Download PDFInfo
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- EP3014093B1 EP3014093B1 EP14730478.6A EP14730478A EP3014093B1 EP 3014093 B1 EP3014093 B1 EP 3014093B1 EP 14730478 A EP14730478 A EP 14730478A EP 3014093 B1 EP3014093 B1 EP 3014093B1
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- 238000002347 injection Methods 0.000 title claims description 92
- 239000007924 injection Substances 0.000 title claims description 92
- 238000000034 method Methods 0.000 title claims description 31
- 238000002485 combustion reaction Methods 0.000 title claims description 7
- 238000012360 testing method Methods 0.000 claims description 40
- 239000000446 fuel Substances 0.000 claims description 12
- 101100129500 Caenorhabditis elegans max-2 gene Proteins 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 description 10
- 238000002405 diagnostic procedure Methods 0.000 description 9
- 230000001419 dependent effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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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
- F02D41/24—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
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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
- F02D41/24—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
- F02D41/2438—Active learning methods
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1012—Engine speed gradient
Definitions
- the run-up test is a well-known diagnostic test for determining the injection quantity error in injectors in an internal combustion engine.
- a method for comparative testing of injection combustion engines is known in which the engine is controlled by an electric motor control, which either has self-diagnostic means or is equipped with a connection interface for an external diagnostic device.
- the self-diagnosis means or the diagnostic device information can be obtained from the measured and displayable deviations of the respectively defined measured variables when a cylinder is switched off, which indicates that a possible target deviation of the deactivated cylinder is possible.
- the absolute injection quantity can not be determined.
- the WO 2004/053316 discloses the determination of an injection valve characteristic via the evaluation of speed gradients with fuel cut and continued control of the injector to be checked.
- the inventor has recognized that during the acceleration test essentially from the speed at which the speed decreases, as long as no injection is active, the torque requirement of the engine by friction and connected thereto aggregates and thus of the maximum speed reached directly to the absolute Injection quantity can be deduced.
- a predeterminable engine-specific factor f is necessary, which is, inter alia, proportional to the moment of inertia of the engine.
- the core idea of the invention consists essentially in depositing the aforementioned predeterminable engine-specific factor f for the respective engine in an engine control unit and / or a workshop diagnostic test apparatus. With the aid of the factor stored for the respective engine, the absolute total injection quantity can thus be determined by means of a run-up test Individual injection quantities of the individual injectors are determined and evaluated at the defined operating point.
- the acquired measurement data are essentially those which are suitable for describing the time profile of the engine speed n ( t ) during the acceleration test, in particular during the startup with active injection and during the fallback to the idling speed during inactive injection.
- the rates of change a 1 and a 2 are calculated.
- the engine to be tested can be accelerated by means of a defined number N of injections per active cylinder, the maximum speed n max . is reached (run-up phase). Thereafter, no injections occur until the engine speed is free to fall back to idle speed (free-fall phase); This is evident, for example, from the fact that the idle controller engages again.
- the absolute average injection quantity per injector m inj is determined by dividing the total injection amount by the number nz of the cylinders of the engine, with active injection, and the total number N of the completed injections per cylinder during startup.
- Inactive cylinder here means that in the run-up phase, the injector of this cylinder does not inject fuel into this cylinder.
- the absolute injection quantity and thus the individual injection quantity drift of a specific individual injector m inj for the cylinder which was inactive when determining the at least one second absolute total injection quantity can be determined.
- the respective absolute total injection quantity M inj ( nz ) is determined based on an energy balance E.
- the respective absolute total injection quantity M inj ( nz ) is determined based on the kinetic energy E idle of the engine at idling speed n idle .
- the respective absolute total injection quantity m inj ( zn ) is determined based on the work W ext performed by the engine during startup .
- a torque requirement M reto to be provided by the engine is determined on the basis of the friction and external work based on the second rate of change a 2 .
- f ( nz ) is the constant predetermined factor for the engine, for nz active cylinders
- the factor f is an individual factor for each engine, which can be determined in advance for each engine.
- the factor f can be stored in an engine control unit and / or a workshop diagnostic test apparatus for use in a method according to the invention.
- f ( nz ) ideally takes place on a vehicle whose injectors have no reduced or increased amount, ie each injector injects the same amount, namely the quantity m inj requested by the engine control unit.
- the inventive method can be implemented by means of an arrangement comprising: a suitably programmed workshop diagnostic device, which is connectable to a connection interface of a correspondingly programmed engine control device of a motor.
- the implementation of the method may be controllably established by the workshop diagnosis device and / or engine control device.
- At least one predetermined engine individual factor f ( nz ) determined when nz cylinders are active may be stored in the workshop diagnostic device and / or in the engine control device.
- the necessary calculations of the injection quantities can be integrated in the software of the engine control unit and / or the workshop diagnostic test apparatus in the form of a correspondingly programmed algorithm as part of a diagnostic module.
- the diagnostic module can be integrated as a software module in the software of an engine control unit (ECU-based workshop diagnostic module). After starting by a workshop diagnostics tester connected externally via a diagnostic interface to the engine control unit, the diagnostic module runs completely autonomously in the engine control unit. Upon completion, the diagnostic module returns the test results to the workshop diagnostic tester.
- ECU-based workshop diagnostic modules differ from simple actuator tests in that the vehicle to be diagnosed in the workshop is offset by the engine control unit into predetermined no-load operating points, impresses actuator excitations and can independently evaluate the result via sensor values with an evaluation logic.
- the diagnostic module as a software module can also be integrated into the software of a workshop diagnostic tester (diagnostic tester-based workshop diagnostic module).
- the functional sequence, the evaluation and the evaluation of the method according to the invention then take place in the workshop diagnostic test apparatus, the measurement data used for the evaluation being determined by means of the engine control unit of sensors present in the vehicle or by additional test sensors.
- the invention can be implemented as a computer program product with computer program code such that when the computer program code is executed on a corresponding programmable device, in particular a motor control device and / or a workshop diagnostic test device, this device carries out a method according to the invention.
- FIG. 1 shows the basic structure of a test arrangement of a motor control device and a workshop diagnostic tester.
- a motor controller 1 as a motor control device via a diagnostic interface 3 and a diagnostic cable 5 with the external diagnostic device 7 as Workshop diagnostic test device coupled.
- the engine control 1 is set up for the control of the engine 9 in normal and test mode.
- the diagnostic device 7 is configured to send the control data required for a specific diagnosis to the engine control unit 1, to control the test procedures and to retrieve the test results from the engine control unit 1.
- the data required for controlling the motor 9 is acquired by the engine controller 1 by means of schematically illustrated sensor inputs 11 to 15.
- the engine controller 1 is further set up to determine from the acquired data according to control parameters stored in the engine controller 1 for controlling the engine. This can be done by calculation based on stored algorithms, readings from stored tables or maps or the like.
- the controlled engine 9 can be a spark-ignited internal combustion engine (gasoline engine) or a self-igniting internal combustion engine (diesel engine), wherein fuel is injected directly into the cylinders of the engine 9 by means of an injector assigned to the respective cylinder.
- gasoline engine gasoline engine
- diesel engine self-igniting internal combustion engine
- the control of the engine 9 is performed by the engine controller 1 via outputs 21 to 25.
- the engine controller 1 via the output 21 a solenoid valve in the fuel injector 31 drives.
- a nozzle needle can be actuated hydraulically, which opens or closes an associated injection nozzle.
- the opening time and the opening time of the injectors are essential control parameters of the engine.
- the specific structure of a fuel injector and the underlying injection principle are not important. It may be, for example, a pump-nozzle or common-rail injection system.
- the engine control unit 1 By means of the opening duration of the injection nozzle and the injection pressure, the engine control unit 1 essentially determines the amount of fuel injected into the associated cylinder. This in turn affects engine output and torque output.
- FIG. 2 shows how the speed runs during a run-up test according to the invention in the simplest case.
- phase marked with "A” the engine started is idling, ie the idling control is active and keeps the idling speed n idle .
- the time l 1 starts the run-up test.
- the injection is inactive, so that the speed drops approximately linearly with the second slope a 2 again.
- the idle speed control resumes and keeps the speed stable (phase "D").
- the torque requirement which is essentially caused by internal engine friction and by units connected to the engine, can be determined from: where f corresponds to the unknown moment of inertia of the motor.
- the total done by the engine during the phase "B" with active injection, ie when running up work W ges corresponds to the sum of the kinetic energy of the rotating motor E red at maximum speed reached n max and the external work done W ext , ie overcoming the friction plus drive of the units, minus the kinetic energy E idle of the engine at idling speed n idle :
- the work performed by the engine W ges is in turn proportional to the total injection quantity of all cylinders M inj ( zn ), or to the average injection quantity of the cylinders times the number nz of the active cylinders times the number N of all the injections per cylinder:
- the engine-individual factor f ( zn ) thus contains both the moment of inertia of the engine and the efficiency of the engine, ie the kinetic energy generated per gram of fuel.
- the inventor has recognized that the factor f ( zn ) is a constant factor which in particular does not depend on the instantaneous torque requirement of the engine under test.
- the factor f ( zn ) can therefore be determined once and stored in the control unit of the engine or in the software of a workshop diagnostic tester .
- the relationship set in the above formula (4) can be used to express the absolute injection quantity by means of a run-up test to determine measured data.
- the relationship can basically be integrated into the software of the engine control unit as part of a control unit-based workshop diagnostic module. That is, the diagnostic module is integrated as a software module in the engine control unit and runs after starting by the externally connected workshop diagnostic tester completely self-sufficient in the engine control unit and reports after completion of the result to the diagnostic tester.
- a diagnostic tester based workshop diagnostic module integration into a diagnostic tester based workshop diagnostic module is possible, i. the functional sequence, the evaluation and the evaluation of the test according to the invention are carried out in the workshop diagnostic test apparatus, wherein the measured data used for the evaluation can be determined by means of the engine control unit of sensors present in the vehicle or by additional test sensors.
- FIG. 3 illustrates as a flowchart a possible implementation of the method according to the invention for determining the absolute injection quantity of an injector.
- a first run-up test takes place in which the injection is active for all ZN cylinders of the engine 9 to be tested.
- step S2 from the detected measured variables, namely the first speed a 1 , at which the speed n in the run-up phase "B" increases, the second speed a 2 , at which the speed n in the free-fall phase " C “decreases and the maximum speed n max reached at the end of the run-up phase” B "determines the absolute total injection quantity m inj . Based on this, the average injection quantity per cylinder or each of the injectors can already be closed.
- the startup test is repeated in accordance with the number NZ of the cylinders of the engine, wherein in each case the injection is inactive in one of the individual cylinders, ie no injection takes place in a cylinder.
- step S4 it is checked whether the running variable n is greater than the number NZ of the cylinders of the engine. If so, then all other necessary startup tests have been performed and the method continues to step S8. Otherwise, the process goes to step S5.
- step S6 the absolute total injection quantity is then determined from the determined measured variables of the currently performed run-up test n .
- step S8 the individual injection quantity drift for each individual injector is determined on the basis of the determined first absolute total injection quantity and the NZ second absolute total injection quantities.
- the second absolute total injection quantity which was determined in the run-up test in which the cylinder belonging to the injector was inactive, is subtracted from the first absolute total injection quantity and the result is divided by the number N of injections per cylinder.
- step S8 alternatively or additionally, the above relationship (4) may be used to determine the relative quantity differences from the inactive cylinder tests while the absolute injection quantity from the test (steps S1 and S2) with all cylinders NZ is active.
- the method ends, wherein the determined results can be output on a display or a printer.
- the in Fig. 3 Part of the method denoted by "II" serves to determine in each case a second absolute total injection quantity by means of a test run in which the injection is inactive in one of the cylinders.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Testing Of Engines (AREA)
Description
Der Hochlauftest ist ein bekannter Diagnosetest zur Ermittlung des Einspritzmengenfehlers bei Injektoren in einem Verbrennungsmotor.The run-up test is a well-known diagnostic test for determining the injection quantity error in injectors in an internal combustion engine.
Beispielsweise ist aus der
Da jedoch der Momentenbedarf durch Reibung und andere Effekte (z.B. seitens am Motor angeschlossener Aggregate) nicht bekannt ist, kann die absolute Einspritzmenge nicht ermittelt werden.However, since the torque demand due to friction and other effects (e.g., from units connected to the engine) is not known, the absolute injection quantity can not be determined.
Daher bleibt beispielsweise im Falle eines Vierzylindermotors, wenn bei zwei Zylindern relativ zu den anderen beiden Zylinder eine größerer Menge ermittelt wurde, weiterhin unklar, ob die zwei Zylinder mit der kleineren Einspritzmenge eine Mindermenge aufweisen und die Zylinder mit der größerer Einspritzmenge die korrekte Menge einspritzen oder ob die zwei Zylinder mit der kleineren Einspritzmenge die korrekte Menge einspritzen und die Zylinder mit der größeren Einspritzmenge eine Mehrmenge aufweisen. D.h., es ist nicht eindeutig, welche Injektoren getauscht werden müssen.Therefore, for example, in the case of a four-cylinder engine, if a larger amount was determined for two cylinders relative to the other two cylinders, it remains unclear whether the two smaller injection quantity cylinders have a smaller amount and the larger injection quantity cylinders inject the correct amount or whether the two cylinders with the smaller one Injection amount inject the correct amount and have the cylinder with the larger injection amount more. That is, it is not clear which injectors must be replaced.
Die
Somit ist es eine mögliche Aufgabe der vorliegenden Erfindung, ein Verfahren zur Ermittlung der absoluten mittleren Einspritzmenge aller Injektoren, insbesondere der absoluten Einspritzmenge eines Injektors vorzuschlagen, um einen absoluten Einspritzmengenfehler bestimmen zu können.
Diese Aufgabe wird mit den Merkmalen der unabhängigen Ansprüche gelöst.
Weitere Ausführungsformen sind in den auf diese rückbezogenen Unteransprüchen angegeben.
Weitere Merkmale und Details der Erfindung ergeben sich aus den Unteransprüchen, der Beschreibung und den Zeichnungen. Dabei gelten
Merkmale und Details, die im Zusammenhang mit dem erfindungsgemäßen Verfahren beschrieben sind, selbstverständlich auch im Zusammenhang mit der erfindungsgemäßen Anordnung und jeweils umgekehrt, sodass bezüglich der Offenbarung der einzelnen Erfindungsaspekte stets wechselseitig Bezug genommen wird beziehungsweise werden kann.
Der Erfinder hat erkannt, dass sich während des Hochlauftests im Wesentlichen aus der Geschwindigkeit, mit der die Drehzahl sinkt, so lange keine Einspritzung aktiv ist, auf den Momentenbedarf des Motors durch Reibung sowie daran angeschlossene Aggregate und damit von der erreichten Maximaldrehzahl direkt auf die absolute Einspritzmenge rückgeschlossen werden kann. Dazu ist lediglich die Kenntnis eines vorherbestimmbaren motorindividuellen Faktors f nötig, der u.a. proportional zum Trägheitsmoment des Motors ist.
Der Kerngedanke der Erfindung besteht im Wesentlichen darin, den genannten vorherbestimmbaren motorindividuellen Faktor f für den jeweiligen Motor in einem Motorsteuergerät und/oder einem Werkstattdiagnosetestgerät zu hinterlegen. Mit Hilfe des für den jeweiligen Motor hinterlegten Faktors, kann somit mittels eines Hochlauftests die absolute Gesamteinspritzmenge und die Einzeleinspritzmengen der einzelnen Injektoren im definierten Betriebspunkt bestimmt und bewertet werden.Thus, it is a possible object of the present invention to propose a method for determining the absolute mean injection quantity of all injectors, in particular the absolute injection quantity of an injector, in order to be able to determine an absolute injection quantity error.
This object is achieved with the features of the independent claims.
Further embodiments are given in the dependent on these dependent claims.
Further features and details of the invention will become apparent from the dependent claims, the description and the drawings. In this case apply
Features and details that are described in connection with the method according to the invention, of course, also in connection with the arrangement according to the invention and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference is or may be.
The inventor has recognized that during the acceleration test essentially from the speed at which the speed decreases, as long as no injection is active, the torque requirement of the engine by friction and connected thereto aggregates and thus of the maximum speed reached directly to the absolute Injection quantity can be deduced. For this purpose, only the knowledge of a predeterminable engine-specific factor f is necessary, which is, inter alia, proportional to the moment of inertia of the engine.
The core idea of the invention consists essentially in depositing the aforementioned predeterminable engine-specific factor f for the respective engine in an engine control unit and / or a workshop diagnostic test apparatus. With the aid of the factor stored for the respective engine, the absolute total injection quantity can thus be determined by means of a run-up test Individual injection quantities of the individual injectors are determined and evaluated at the defined operating point.
Besonders vorteilhaft ist, dass die Umsetzung der Erfindung keine strukturellen Änderung bei vorhandenen Motorsteuerungseinrichtungen und Werkstattdiagnosegeräten, sondern lediglich eine erfindungsgemäß verbesserte Auswertung - ggf. abhängig von im Steuergerät des Motors bzw. dem Werkstattdiagnosegerät vorhandenen Funktionen - z.B. der beim bekannten Hochlauftest erfassten Messdaten erfordert.It is particularly advantageous that the implementation of the invention, no structural change in existing engine control devices and workshop diagnostic equipment, but only an inventively improved evaluation - possibly depending on existing in the control unit of the engine or the workshop diagnosis functions - e.g. requires the measured data recorded in the known run-up test.
Kennt man die absolute Einspritzmenge der einzelnen Injektoren, dann kann bestimmt werden, welche der Injektoren fehlerhaft einspritzen. Somit ist eindeutig ersichtlich, welcher Injektor getauscht werden muss. So können Werkstattkosten reduziert werden.Knowing the absolute injection quantity of the individual injectors, then it can be determined which injectors inject incorrectly. This clearly shows which injector needs to be replaced. So workshop costs can be reduced.
Ein erfindungsgemäßes Verfahren zur Ermittlung der absoluten Kraftstoffeinspritzmenge der Injektoren eines Motors der Art einer Verbrennungskraftmaschine mit eine Zylinderanzahl NZ kann die Schritte aufweisen: Ermitteln einer ersten absoluten Gesamteinspritzmenge Minj (nz = NZ) aller Injektoren basierend auf bei einem Hochlauftest, bei dem alle Zylinder des Motors aktiv sind, erfassten Messdaten und einem vorbestimmten motorindividuellen Faktor f(nz = NZ), der für den Fall bestimmt wurde, dass alle Zylinder aktiv sind. Die erfassten Messdaten sind im Wesentlichen solche, die geeignet sind, den zeitlichen Verlauf der Motordrehzahl n(t) während der Hochlauftests, insbesondere während des Hochlaufens mit aktiver Einspritzung und während des Zurückfallens auf die Leerlaufdrehzahl bei inaktiver Einspritzung, zu beschreiben.An inventive method for determining the absolute fuel injection quantity of the injectors of an engine of the type of internal combustion engine with a number of cylinders NZ may comprise the steps of: determining a first absolute total injection amount M inj ( nz = NZ ) of all injectors based on a run-up test in which all cylinders of the Motors are active, recorded measurement data and a predetermined engine-individual factor f ( nz = NZ ) , which was determined in the event that all cylinders are active. The acquired measurement data are essentially those which are suitable for describing the time profile of the engine speed n ( t ) during the acceleration test, in particular during the startup with active injection and during the fallback to the idling speed during inactive injection.
Die während des Hochlauftests zu erfassenden Messdaten können beispielsweise eine maximal erreichten Motordrehzahl nmax , eine erste Änderungsgeschwindigkeit
Beispielsweise kann während des Hochlauftests der zu testende Motor mittels einer definierten Anzahl N Einspritzungen pro aktivem Zylinder beschleunigt werden, wobei die Maximaldrehzahl nmax . erreicht wird (Hochlauf-Phase). Danach erfolgen keine Einspritzungen mehr bis die Drehzahl des Motors frei zurück auf die Leerlaufdrehzahl gefallen (Free-fall-Phase) ist; dies ist beispielsweise daran erkennbar, wenn der Leerlaufregler wieder eingreift.For example, during the run-up test, the engine to be tested can be accelerated by means of a defined number N of injections per active cylinder, the maximum speed n max . is reached (run-up phase). Thereafter, no injections occur until the engine speed is free to fall back to idle speed (free-fall phase); This is evident, for example, from the fact that the idle controller engages again.
Basierend auf der ersten absoluten Gesamteinspritzmenge Minj (nz = NZ) kann die absolute mittlere Einspritzmenge pro Injektor
In einer Weiterbildung des erfindungsgemäßen Verfahrens wird wenigstens eine zweite absolute Gesamteinspritzmenge Minj (nz = NZ-1) basierend auf Messdaten eines weiteren Hochlauftests ermittelt, bei dem wenigstens einer der Zylinder inaktiv ist, und ein vorherbestimmbarer motorindividueller Faktor f(nz - 1) zur Anwendung kommt, der für den Motor bei einem inaktiven Zylinder bestimmt wurde. Inaktiver Zylinder bedeutet hier, dass in der Hochlauf-Phase der Injektor dieses Zylinders keinen Kraftstoff in diesen Zylinder einspritzt. Basierend auf der ersten und der wenigstens einen zweiten absoluten Gesamteinspritzmenge kann die absolute Einspritzmenge und damit die individuelle Einspritzmengendrift eines bestimmten einzelnen Injektors minj für den Zylinder ermittelt werden, der bei der Ermittlung der wenigstens einen zweiten absoluten Gesamteinspritzmenge inaktiv war. Hierzu muss lediglich die ermittelte zweite absolute Gesamteinspritzmenge Minj (nz = NZ - 1) von der ermittelten ersten absoluten Gesamteinspritzmenge Minj (nz - NZ) abgezogen werden und das Ergebnis durch die Anzahl N der Einspritzungen pro Zylinder dividiert werden.In one development of the method according to the invention, at least one second absolute total injection quantity M inj ( nz = NZ -1) is determined on the basis of measured data of a further run-up test, in which at least one of the cylinders is inactive, and a predeterminable engine-individual factor f ( nz - 1) determined for the engine on an inactive cylinder. Inactive cylinder here means that in the run-up phase, the injector of this cylinder does not inject fuel into this cylinder. Based on the first and the at least one second absolute total injection quantity , the absolute injection quantity and thus the individual injection quantity drift of a specific individual injector m inj for the cylinder which was inactive when determining the at least one second absolute total injection quantity can be determined. For this purpose, only the determined second absolute total injection quantity M inj ( nz = NZ -1) has to be subtracted from the determined first absolute total injection quantity M inj ( nz - NZ ) and the result divided by the number N of injections per cylinder.
Bevorzugt wird die jeweilige absolute Gesamteinspritzmenge Minj (nz) basierend auf einer Energiebilanz E ermittelt.Preferably, the respective absolute total injection quantity M inj ( nz ) is determined based on an energy balance E.
Bevorzugt die jeweilige absolute Gesamteinspritzmenge Minj (nz) basierend auf der kinetischen Energie Eidle des Motors bei Leerlaufdrehzahl nidle ermittelt.Preferably, the respective absolute total injection quantity M inj ( nz ) is determined based on the kinetic energy E idle of the engine at idling speed n idle .
Bevorzugt wird die jeweilige absolute Gesamteinspritzmenge m inj (zn) basierend auf der vom Motor während des Hochlaufens geleisteten Arbeit Wext ermittelt.Preferably, the respective absolute total injection quantity m inj ( zn ) is determined based on the work W ext performed by the engine during startup .
Bevorzugt wird ein vom Motor zu erbringender Momentenbedarf Mreto aufgrund von Reibung und externer Arbeit basierend auf der zweiten Änderungsgeschwindigkeit a2 ermittelt.Preferably, a torque requirement M reto to be provided by the engine is determined on the basis of the friction and external work based on the second rate of change a 2 .
Bevorzugt wird berücksichtigt, dass eine vom Motor bis zum Erreichen der Maximaldrehzahl nmax , geleistete Arbeit und damit absolute Gesamteinspritzmenge quadratisch von der erreichten Maximaldrehzahl nmax , abhängig ist.It is preferably taken into account that a work performed by the engine until reaching the maximum speed n max and thus absolute total injection quantity is quadratically dependent on the maximum speed n max achieved.
Die Ermittlung der jeweiligen absoluten Gesamteinspritzmenge aller Zylinder Minj (zn) wird insbesondere basierend auf dem folgenden Zusammenhang
Der Faktor f ist ein für jeden Motor individueller Faktor, der für jeden Motor vorab bestimmbar ist. Der Faktor f kann in einem Motorsteuergerät und/oder ein Werkstattdiagnosetestgerät zur Verwendung in einem erfindungsgemäßen Verfahren abgespeichert werden. D.h., der Faktor f kann vom Hersteller des Motors vorab für jede Motorausführung basierend auf der während des Hochlaufens insgesamt eingespritzten Kraftstoffmenge Minj = N ·nz ·minj anhand der folgenden Formel bestimmt werden:
Für das erfindungsgemäße Verfahren ist es zur Ermittlung der individuellen Einspritzmenge eines Injektors ausreichend, wenn der Faktor f(nz) für nz = NZ sowie nz = NZ - 1 im Vorhinein bestimmt wird.The determination of the respective absolute total injection quantity of all cylinders M inj (z n ) is made in particular based on the following relationship
The factor f is an individual factor for each engine, which can be determined in advance for each engine. The factor f can be stored in an engine control unit and / or a workshop diagnostic test apparatus for use in a method according to the invention. That is, the factor f may be determined in advance by the engine manufacturer for each engine design based on the total amount of fuel injected during run-up M inj = N * nz * m inj using the following formula:
For the method according to the invention, it is sufficient to determine the individual injection quantity of an injector if the factor f ( nz ) for nz = NZ and nz = NZ -1 is determined in advance.
Das erfindungsgemäße Verfahren kann mittels einer Anordnung implementiert werden, die aufweist: ein entsprechend programmiertes Werkstattdiagnosegerät, welches an eine Anschlussschnittstelle eines entsprechend programmierten Motorsteuerungsgeräts eines Motors anschließbar ist. Die Durchführung des Verfahrens kann durch das Werkstattdiagnosegerät und/oder Motorsteuerungsgerät steuerbar eingerichtet sein. Wenigstens ein vorbestimmter motorindividuellen Faktor f(nz), der bestimmt wurde, wenn nz Zylinder aktiv sind, kann in dem Werkstattdiagnosegerät und/oder in dem Motorsteuerungsgerät abgespeichert sein.The inventive method can be implemented by means of an arrangement comprising: a suitably programmed workshop diagnostic device, which is connectable to a connection interface of a correspondingly programmed engine control device of a motor. The implementation of the method may be controllably established by the workshop diagnosis device and / or engine control device. At least one predetermined engine individual factor f ( nz ) determined when nz cylinders are active may be stored in the workshop diagnostic device and / or in the engine control device.
Die notwendigen Berechnungen der Einspritzmengen können in Form eines entsprechend programmierten Algorithmus als Bestandteil eines Diagnosemoduls in die Software des Motorsteuergeräts und/oder des Werkstattdiagnosetestgeräts integriert sein.The necessary calculations of the injection quantities can be integrated in the software of the engine control unit and / or the workshop diagnostic test apparatus in the form of a correspondingly programmed algorithm as part of a diagnostic module.
D.h., das Diagnosemodul kann als Softwaremodul in die Software eines Motorsteuergeräts integriert werden (steuergerätebasiertes Werkstattdiagnosemodul). Nach Start durch ein extern über eine Diagnoseschnittstelle an die Motorsteuerung angeschlossenes Werkstattdiagnosetestgerät läuft das Diagnosemodul vollständig autark im Motorsteuergerät ab. Nach Beendigung meldet das Diagnosemodul die Testergebnisse an das Werkstattdiagnosetestgerät zurück. Ein solches steuergerätebasiertes Werkstattdiagnosemodule unterscheiden sich von einfachen Aktorentests dadurch, dass das zu diagnostizierende Fahrzeug in der Werkstatt durch das Motorsteuergerät in vorbestimmte lastlose Betriebspunkte versetzt, Aktorenanregungen aufprägt und das Ergebnis über Sensorwerte mit einer Auswertelogik eigenständig auswertet kann.That is, the diagnostic module can be integrated as a software module in the software of an engine control unit (ECU-based workshop diagnostic module). After starting by a workshop diagnostics tester connected externally via a diagnostic interface to the engine control unit, the diagnostic module runs completely autonomously in the engine control unit. Upon completion, the diagnostic module returns the test results to the workshop diagnostic tester. Such a ECU-based workshop diagnostic modules differ from simple actuator tests in that the vehicle to be diagnosed in the workshop is offset by the engine control unit into predetermined no-load operating points, impresses actuator excitations and can independently evaluate the result via sensor values with an evaluation logic.
Alternativ kann das Diagnosemodul als Softwaremodul auch in die Software eines Werkstattdiagnosetestgeräts integriert werden (diagnosetesterbasiertes Werkstattdiagnosemodul). Der funktionale Ablauf, die Auswertung und die Bewertung des erfindungsgemäßen Verfahrens erfolgt dann im Werkstattdiagnosetestgerät, wobei die zur Auswertung herangezogenen Messdaten mithilfe des Motorsteuergeräts von im Fahrzeug vorhandenen Sensoren oder durch zusätzliche Prüfsensorik ermittelt werden.Alternatively, the diagnostic module as a software module can also be integrated into the software of a workshop diagnostic tester (diagnostic tester-based workshop diagnostic module). The functional sequence, the evaluation and the evaluation of the method according to the invention then take place in the workshop diagnostic test apparatus, the measurement data used for the evaluation being determined by means of the engine control unit of sensors present in the vehicle or by additional test sensors.
Die Erfindung kann als Computerprogrammprodukt mit Computerprogrammcode derart implementiert werden, dass wenn der Computerprogrammcode auf einer entsprechenden programmierbaren Einrichtung, insbesondere einem Motorsteuergerät und/oder einem Werkstattdiagnosetestgerät, ausgeführt wird, diese Einrichtung ein erfindungsgemäßes Verfahren ausführt.The invention can be implemented as a computer program product with computer program code such that when the computer program code is executed on a corresponding programmable device, in particular a motor control device and / or a workshop diagnostic test device, this device carries out a method according to the invention.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. Es zeigen (schematisch):
-
Fig. 1 den prinzipiellen Aufbau einer Testanordnung aus einer Motorsteuerungseinrichtung und einem Werkstattdiagnosetesteinrichtung, -
Fig. 2 den zeitlichen Verlauf der Motordrehzahl eines Motors bei einem erfindungsgemäßen Hochlauftest, und -
Fig. 3 ein Ablaufdiagramm einer möglichen Umsetzung des erfindungsgemäßen Verfahrens zur Bestimmung der absoluten Einspritzmenge.
-
Fig. 1 the basic structure of a test arrangement comprising a motor control device and a workshop diagnostic test device, -
Fig. 2 the time course of the engine speed of a motor in a run-up test according to the invention, and -
Fig. 3 a flowchart of a possible implementation of the inventive method for determining the absolute injection quantity.
In der nachfolgenden Beschreibung werden spezifische Einzelheiten dargelegt. Es versteht sich jedoch, dass Ausführungen der Erfindung auch ohne diese spezifischen Einzelheiten zur Anwendung kommen können. Bekannte Schaltungen, Strukturen und Verfahren sind nicht im Detail gezeigt, um das Verständnis der vorliegenden Beschreibung nicht zu erschweren.In the following description, specific details are set forth. It is understood, however, that embodiments of the invention may be used without these specific details. Known circuits, structures and methods are not shown in detail so as not to obscure the understanding of the present description.
Eine Motorsteuerung 1 als Motorsteuerungsgerät über eine Diagnoseschnittstelle 3 und ein Diagnosekabel 5 mit dem externen Diagnosegerät 7 als Werkstattdiagnosetesteinrichtung gekoppelt. Die Motorsteuerung 1 ist für die Steuerung des Motors 9 im Normal- und im Testbetrieb eingerichtet.A
Im hier beschriebenen Ausführungsbeispiel ist das Diagnosegerät 7 konfiguriert, die für eine bestimmte Diagnose erforderlichen Steuerdaten an die Motorsteuerung 1 zu senden, die Testabläufe zu steuern und die Testergebnisse aus der Motorsteuerung 1 abzurufen.In the embodiment described here, the
Die zur Steuerung des Motors 9 erforderlichen Daten erfasst die Motorsteuerung 1 mittels schematisch dargestellter Sensoreingänge 11 bis 15. Die Motorsteuerung 1 ist weiter eingerichtet, aus den erfassten Daten entsprechend in der Motorsteuerung 1 hinterlegter Softwaremodule zur Steuerung des Motors erforderliche Steuergrößen zu bestimmen. Dies kann durch Berechnung anhand hinterlegter Algorithmen, Auslesen aus hinterlegten Tabellen oder Kennfeldern oder dergleichen erfolgen.The data required for controlling the
Grundsätzlich kann es sich bei dem gesteuerten Motor 9 um eine fremdgezündete Verbrennungskraftmaschine (Ottomotor) oder eine selbstzündende Verbrennungskraftmaschine (Dieselmotor) handeln, wobei in die Zylinder des Motors 9 jeweils mittels eines dem jeweiligen Zylinder zugeordneten Injektors Kraftstoff direkt eingespritzt wird.In principle, the controlled
Die Steuerung des Motors 9 erfolgt durch die Motorsteuerung 1 über Ausgänge 21 bis 25. Zur Veranschaulichung der Erfindung ist hier beispielhaft nur die Ansteuerung eines einzigen Kraftstoffinjektors 31 für einen der Zylinder des Motors 9 schematisch dargestellt. Die Ansteuerung des Kraftstoffinjektors 31 erfolgt über den Steuerausgang 21. Beispielsweise kann die Motorsteuerung 1 über den Ausgang 21 ein Magnetventil in dem Kraftstoffinjektor 31 ansteuert. Durch das Magnetventil kann hydraulisch eine Düsennadel betätigt werden, welche eine zugehörige Einspritzdüse öffnet oder verschließt. Der Öffnungszeitpunkt und die Öffnungsdauer der Einspritzdüsen sind wesentliche Steuerparameter des Motors. Für die vorliegende Erfindung sind der konkrete Aufbau eines Kraftstoffinjektors sowie das zugrundeliegende Einspritzprinzip nicht von Bedeutung. Es kann sich beispielsweise um ein Pumpe-Düse- oder Common-Rail-Einspritzsystem handeln.The control of the
Mittels der Öffnungsdauer der Einspritzdüse und den Einspritzdruck bestimmt die Motorsteuerung 1 im Wesentlichen die in den zugehörigen Zylinder eingespritzte Kraftstoffmenge. Diese wiederum beeinflusst Leistungs- und Drehmomentabgabe des Motors.By means of the opening duration of the injection nozzle and the injection pressure, the
Zu Beginn, in der mit "A" markierten Phase, befindet sich der gestartete Motor im Leerlauf, d.h. die Leerlaufregelung ist aktiv und hält die Drehzahl bei der Leerlaufdrehzahl nidle . Zum Zeitpunkt l 1 beginnt der Hochlauftest. In der mit "B" markierten Phase ist ab dem Zeitpunkt l 1 die Einspritzung aktiv, sodass die Motordrehzahl des Motors näherungsweise linear mit einer konstanten ersten Steigung
Der Momentenbedarf, der im Wesentlichen durch motorinterne Reibung und von an den Motor angeschlossenen Aggregaten verursacht wird, lässt sich ermitteln aus:
Die insgesamt durch den Motor während der Phase "B" mit aktiver Einspritzung, d.h. beim Hochlaufen geleistete Arbeit Wges , entspricht der Summe aus der kinetischen Energie des rotierenden Motors Erot bei maximal erreichter Drehzahl nmax und der geleisteten externen Arbeit Wext , d.h. Überwindung der Reibung plus Antrieb der Aggregate, minus der kinetischen Energie Eidle des Motors bei Leerlaufdrehzahl nidle :
Die geleistete Arbeit des Motors Wges ist wiederum proportional zur Gesamteinspritzmenge aller Zylinder Minj (zn), bzw. zur mittleren Einspritzmenge der Zylinder mal Anzahl nz der aktiven Zylinder mal Anzahl N aller Einspritzungen pro Zylinder:
Daraus lässt sich die absolute Gesamteinspritzmenge ermitteln durch:
Der motorindividuelle Faktor f(zn) enthält somit sowohl das Trägheitsmoment des Motors als auch den Wirkungsgrad des Motors, d.h. die erzeugte Bewegungsenergie pro Gramm Kraftstoff.The engine-individual factor f ( zn ) thus contains both the moment of inertia of the engine and the efficiency of the engine, ie the kinetic energy generated per gram of fuel.
Der Erfinder hat erkannt, dass der Faktor f(zn) ein konstanter Faktor ist, der insbesondere nicht vom momentanen Momentenbedarf des Motors unter Test abhängig ist. Der Faktor f(zn) kann daher einmalig ermittelt werden und im Steuergerät des Motors oder in der Software eines Werkstattdiagnosetestgeräts hinterlegt werden.The inventor has recognized that the factor f ( zn ) is a constant factor which in particular does not depend on the instantaneous torque requirement of the engine under test. The factor f ( zn ) can therefore be determined once and stored in the control unit of the engine or in the software of a workshop diagnostic tester .
Der in der obigen Formel (4) gefasste Zusammenhang kann eingesetzt werden, um jeweils die absolute Einspritzmenge mittels bei einem Hochlauftest gemessener Messdaten zu ermitteln. Der Zusammenhang kann grundsätzlich als Bestandteil eines steuergerätebasierten Werkstattdiagnosemoduls in die Software des Motorsteuergeräts integriert werden. D.h., das Diagnosemodul ist als Softwaremodul in das Motorsteuergerät integriert und läuft nach Start durch das extern angeschlossene Werkstattdiagnosetestgerät vollständig autark im Motorsteuergerät ab und meldet nach Beendigung das Ergebnis an den Diagnosetester zurück.The relationship set in the above formula (4) can be used to express the absolute injection quantity by means of a run-up test to determine measured data. The relationship can basically be integrated into the software of the engine control unit as part of a control unit-based workshop diagnostic module. That is, the diagnostic module is integrated as a software module in the engine control unit and runs after starting by the externally connected workshop diagnostic tester completely self-sufficient in the engine control unit and reports after completion of the result to the diagnostic tester.
Alternativ ist auch eine Integration in ein diagnosetesterbasiertes Werkstattdiagnosemodul möglich, d.h. der funktionale Ablauf, die Auswertung und die Bewertung des erfindungsgemäßen Tests erfolgt dabei im Werkstattdiagnosetestgerät, wobei die zur Auswertung herangezogenen Messdaten mithilfe des Motorsteuergeräts von im Fahrzeug vorhandenen Sensoren oder durch zusätzliche Prüfsensorik ermittelt werden können.Alternatively, integration into a diagnostic tester based workshop diagnostic module is possible, i. the functional sequence, the evaluation and the evaluation of the test according to the invention are carried out in the workshop diagnostic test apparatus, wherein the measured data used for the evaluation can be determined by means of the engine control unit of sensors present in the vehicle or by additional test sensors.
Somit ist zur Umsetzung der Erfindung im Wesentlichen nur eine Anpassung vorhandener Software in der Motorsteuerung und/oder Diagnosegeräten notwendig, um das erfindungsgemäße Verfahren zu implementieren.Thus, to implement the invention essentially only an adaptation of existing software in the engine control and / or diagnostic equipment is necessary to implement the inventive method.
In einem ersten Schritt S1 erfolgt zuerst ein erster Hochlauftest, bei dem bei allen ZN Zylindern des zu testenden Motors 9 die Einspritzung aktiv ist.In a first step S1, a first run-up test takes place in which the injection is active for all ZN cylinders of the
In Schritt S2 wird aus den erfassten Messgrößen, nämlich der ersten Geschwindigkeit a 1, mit der die Drehzahl n in der Hochlauf-Phase "B" ansteigt, der zweiten Geschwindigkeit a 2, mit der die Drehzahl n in der Free-fall-Phase "C" abfällt und der am Ende der Hochlauf-Phase "B" erreichten Maximaldrehzahl nmax die absolute Gesamteinspritzmenge minj bestimmt. Basierend darauf kann bereits die mittlere Einspritzmenge pro Zylinder bzw. jedes der Injektoren geschlossen werden.In step S2, from the detected measured variables, namely the first speed a 1 , at which the speed n in the run-up phase "B" increases, the second speed a 2 , at which the speed n in the free-fall phase " C "decreases and the maximum speed n max reached at the end of the run-up phase" B "determines the absolute total injection quantity m inj . Based on this, the average injection quantity per cylinder or each of the injectors can already be closed.
Daraufhin wird der Hochlauftest entsprechend der Anzahl NZ der Zylinder des Motors wiederholt, wobei jeweils bei einem der Einzelzylinder die Einspritzung inaktiv ist, d.h. in einen Zylinder keine Einspritzung erfolgt.Then the startup test is repeated in accordance with the number NZ of the cylinders of the engine, wherein in each case the injection is inactive in one of the individual cylinders, ie no injection takes place in a cylinder.
In Schritt S3 wird eine Laufvariable n = 1 gesetzt.In step S3, a run variable n = 1 is set.
In Schritt S4 wird geprüft, ob die Laufvariable n größer der Anzahl NZ der Zylinder des Motors ist. Wenn dem so ist, dann wurden alle weiteren notwendigen Hochlauftests durchgeführt und das Verfahren geht weiter zu Schritt S8. Andernfalls geht das Verfahren zu Schritt S5.In step S4, it is checked whether the running variable n is greater than the number NZ of the cylinders of the engine. If so, then all other necessary startup tests have been performed and the method continues to step S8. Otherwise, the process goes to step S5.
In Schritt S5 wird der jeweilige zweite Hochlauftest n wie in den Schritten S1 und S2 wiederholt, wobei aber im Unterschied dazu dem der Laufvariable zugeordneten Zylinder keine Einspritzung erfolgt, d.h. zn = NZ - 1.In step S5, the respective second run-up test n is repeated as in steps S1 and S2, but in contrast to that the cylinder associated with the run variable does not undergo injection, ie zn = NZ -1.
In Schritt S6 wird dann aus den ermittelten Messgrößen des aktuell durchgeführten Hochlauftests n die absolute Gesamteinspritzmenge ermittelt.In step S6, the absolute total injection quantity is then determined from the determined measured variables of the currently performed run-up test n .
Dies erfolgt wiederum mithilfe des Zusammenhangs (4), wobei ein zweiter Faktor f(nz = NZ - 1) anstelle des Faktors f(nz = NZ) verwendet wird, da für die vom Motor geleistete Arbeit bei ZN - 1 aktiven Zylindern ein anderer Zusammenhang gilt als mit NZ aktiven Zylindern.This is again done by means of relationship (4), using a second factor f ( nz = NZ - 1) instead of the factor f ( nz = NZ ), since the work done by the engine has a different relationship for ZN - 1 active cylinders is considered to be active with NZ active cylinders.
In Schritt S7 wird die Laufvariable inkrementiert, d.h. n := n + 1. Danach geht das Verfahren zu Schritt S4.In step S7, the running variable is incremented, that is, n : = n + 1. Thereafter, the process goes to step S4.
In Schritt S8 wird anhand der ermittelten ersten absolute Gesamteinspritzmenge und der NZ zweiten absoluten Gesamteinspritzmengen die individuelle Einspritzmengendrift für jeden einzelnen Injektor bestimmt. Dazu wird jeweils für einen bestimmten Injektor diejenige zweite absolute Gesamteinspritzmenge, die bei dem Hochlauftest ermittelt wurde, bei dem der zum Injektor gehörige Zylinder inaktiv war, von der ersten absoluten Gesamteinspritzmenge abgezogen und das Ergebnis durch die Anzahl N der Einspritzungen pro Zylinder dividiert.In step S8, the individual injection quantity drift for each individual injector is determined on the basis of the determined first absolute total injection quantity and the NZ second absolute total injection quantities. For this purpose, in each case for a particular injector, the second absolute total injection quantity, which was determined in the run-up test in which the cylinder belonging to the injector was inactive, is subtracted from the first absolute total injection quantity and the result is divided by the number N of injections per cylinder.
In Schritt S8 kann alternativ oder zusätzlich der obige Zusammenhang (4) verwendet werden, um aus den Tests mit einem inaktiven Zylinder die relativen Mengenunterschiede zu ermitteln, während die absolute Einspritzmenge aus dem Test (Schritte S1 und S2) mit allen Zylindern NZ aktiv hervorgeht.In step S8, alternatively or additionally, the above relationship (4) may be used to determine the relative quantity differences from the inactive cylinder tests while the absolute injection quantity from the test (steps S1 and S2) with all cylinders NZ is active.
Anschließend endet das Verfahren, wobei die ermittelten Ergebnisse auf einer Anzeige oder einem Drucker ausgegeben werden können.Subsequently, the method ends, wherein the determined results can be output on a display or a printer.
Der in
Der in
Claims (8)
- Method for determining the absolute fuel injection quantity of the injectors (31) of an engine (9) of the internal combustion engine type having a number of cylinders NZ, characterized in that a first absolute total injection quantity Minj (nz = NZ) of all the injectors (31) is determined on the basis of measured data captured in a run-up test, in which all the cylinders of the engine (9) are active, and a predetermined individual engine factor f(nz = NZ) of the engine (9), which was determined for the case in which all the cylinders are active and is stored in a workshop diagnostic device (7) and/or an engine control device (1), wherein the measured data is a maximum engine speed nmax reached, a first rate of change a1 of the engine speed during the run-up with active injection, a second rate of change a2 of the engine speed with inactive injection and an idling speed nidle of the engine (9) or these variables are derived from the captured measured data and are suitable to describe the time profile of the engine speed n(t) during the run-up test,
wherein the respective absolute injection quantity Minj(zn) is determined on the basis of the following relationship - Method according to Claim 1,
that at least a second absolute injection quantity Minj(nz = NZ - 1) is determined on the basis of measured data from a further run-up test, in which at least one of the cylinders is inactive, and an individual engine factor f(nz - 1), which was determined for the case of an inactive cylinder. - Method according to either of Claims 1 and 2,
characterized in that
the respective absolute total injection quantity Minj(nz) is determined on the basis of an energy balance Eges. - Method according to Claim 3,
characterized in that
the respective absolute total injection quantity Minj(nz) is determined on the basis of at least one of the kinetic energy Eidle of the engine (9) at idling speed nidle and the work Wext performed by the engine (9) during the run-up. - Method according to one of the preceding claims,
characterized in that
a torque requirement Mreib to be performed by the engine (9) is determined on the basis of friction and external work based on the second rate of change a2 . - Method according to one of the preceding claims,
characterized in that
account is taken of the fact that work provided by the engine (9) until the maximum speed nmax is reached, and therefore the absolute total injection quantity, depends on the square of the maximum speed reached nmax. - Arrangement for carrying out a method according to one of Claims 1 to 6,
characterized in that
an appropriately programmable workshop diagnostic device (7) can be connected via a connection interface (3) to an appropriately programmed engine control device (1) of an engine (9), and the performance of the method can be controlled by the workshop diagnostic device (7) and/or engine control device (7),
wherein at least one predetermined individual motor factor f(nz), which is proportional to the moment of inertia of the engine when nz cylinders are active, is stored in the workshop diagnostic device (7) and/or in the engine control device (1) . - Computer program product with computer program code of a type such that when the computer program code is executed on an appropriately programmable unit (7, 1), in particular a workshop diagnostic device (7) and/or an engine control device (1), this unit executes a method according to one of Claims 1 to 6.
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JP5829953B2 (en) * | 2012-03-09 | 2015-12-09 | トヨタ自動車株式会社 | Control device for multi-cylinder internal combustion engine |
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CN105339635B (en) | 2018-10-19 |
US9915216B2 (en) | 2018-03-13 |
US20160369732A1 (en) | 2016-12-22 |
WO2014206684A1 (en) | 2014-12-31 |
CN105339635A (en) | 2016-02-17 |
EP3014093A1 (en) | 2016-05-04 |
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