EP3215744B1 - Method for producing a set of characteristic curves of a fluid pump, use of a limited valve, use of a staging valve, and control device for a fluid conveying system - Google Patents

Method for producing a set of characteristic curves of a fluid pump, use of a limited valve, use of a staging valve, and control device for a fluid conveying system Download PDF

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Publication number
EP3215744B1
EP3215744B1 EP15788053.5A EP15788053A EP3215744B1 EP 3215744 B1 EP3215744 B1 EP 3215744B1 EP 15788053 A EP15788053 A EP 15788053A EP 3215744 B1 EP3215744 B1 EP 3215744B1
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EP
European Patent Office
Prior art keywords
valve
fluid
conveying system
pressure
fluid pump
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EP15788053.5A
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German (de)
French (fr)
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EP3215744A1 (en
Inventor
Gerald BEHRENDT
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Vitesco Technologies GmbH
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Vitesco Technologies GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • 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
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • 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

Definitions

  • the invention relates to a method for creating a characteristic field of a fluid pump of a pressure-dependent fluid delivery system for a working area of the fluid pump.
  • the invention further relates to the use of a limited valve, the use of a step valve and a control device for a fluid delivery system.
  • Fluid delivery systems are used, for example, as fuel delivery systems in motor vehicles. Such fluid delivery systems have a fluid pump which is driven by an electric motor and are pressure-dependent.
  • document US 2014/105758 A1 discloses a closed loop control system for a fuel pump that includes calibration functionality and enables useful pressure regulation. A pressure generated by the pump system can be adjusted by measuring a characteristic phase current as a function of the speed.
  • document WO 2008/067622 A2 discloses a method and apparatus for controlling fuel flow in an internal combustion engine.
  • a control system is provided which provides a fuel flow which corresponds to the fuel requirement of the internal combustion engine with respect to a flow rate.
  • DE 102011015154 A1 describes a method for monitoring an electric motor-driven fuel pump. When monitoring an electric motor driven fuel pump of a fuel delivery unit for a motor vehicle, a pumping is carried out current is monitored depending on a pump voltage or a pump speed.
  • the object of the invention is to provide a method for the improved creation of a characteristic field of a fluid pump of a pressure-dependent fluid delivery system for a working area of the fluid pump. It is a further object of the invention to demonstrate the use of a limited valve and the use of a step valve as calibration valves as well as a control device for a fluid delivery system.
  • the characteristic field can be assigned to areas and values of pressure and speed and can thus be leveled.
  • the fluid delivery system is designed as a fuel delivery system for a motor vehicle and is designed for gasoline.
  • the recorded characteristic field comprises characteristic curves of constant control current, which are a dependency between the speed of the fluid pump and the pressure in the fluid delivery system.
  • the fluid delivery system is designed, for example, as a fuel delivery system for a motor vehicle and is designed for diesel. Since fluid pumps for diesel are designed differently than petrol pumps, this configuration allows the characteristic field to be leveled more precisely.
  • the fluid delivery system further comprises a calibration valve, which is located on an outlet side the fluid pump is arranged and opens as a function of a predetermined pressure in order to provide a pressure-dependent calibration function and the step of taking up additionally depends on the calibration function.
  • a calibration valve can uniquely assign the control current and pressure. This is achieved in that a kink is created in a recorded pressure characteristic by opening the valve. This supports the leveling of the characteristic field for the control current that is recorded later.
  • the calibration valve is designed as one of the following valve types: threshold pressure valve; limited valve; Step valve.
  • valve types each produce one or more kinks in the pressure characteristic of the fluid delivery system, and thus enable further anchor points for leveling the characteristic field.
  • the calibration valve is designed to derive a predetermined maximum volume flow from the fluid delivery system if the calibration valve is designed as a limited valve.
  • the calibration valve is designed to derive a predetermined maximum volume flow from the fluid delivery system for each stage if the calibration valve is designed as a stage valve.
  • An assignment of the additional anchor points for the characteristic field can take place more reliably if the derived volume flows are predefined.
  • the step of setting the drive current and changing a flow volume takes place after the fluid pump has been switched on.
  • a limited valve is used as a calibration valve in a fuel delivery system.
  • a method can be carried out according to the first aspect.
  • a step valve is set up as a calibration valve in a fluid delivery system.
  • a method according to the first aspect can also be carried out here.
  • the control unit is set up to carry out a method according to the first aspect.
  • Figure 1 shows a fluid delivery system 10.
  • the fluid delivery system 10 is a fuel delivery system for delivering gasoline from a tank.
  • the fluid delivery system 10 can be designed to deliver diesel.
  • the fuel here the gasoline
  • fuel rail system for reasons of clarity, in Figure 1 no representation of both the tank and the injection system. In the exemplary embodiment, it is a so-called pre-conveyor system.
  • Other configurations may also be different fluid delivery systems or parts of a fluid delivery system.
  • the fluid delivery system 10 comprises an electric motor 11.
  • the electric motor 11 is current-controlled in the exemplary embodiment.
  • the electric motor 11 is controlled by an engine control unit 12.
  • the engine control unit has a control unit and an additional computing unit 12a.
  • the computing unit 12a is spatially separated from the engine control unit 12 and is therefore outsourced.
  • the electric motor 11 drives a fluid pump 13.
  • the fluid pump 13 is a fuel pump.
  • the electric motor 11 is connected to the fluid pump 13 via a mechanical coupling 17.
  • the fluid pump 13 pumps gasoline via a fluid line 15 from the tank through the fluid delivery system 10 and via a line 16 to the injection system.
  • a calibration valve 14 is connected and hydraulically coupled to the fluid pump 13.
  • the calibration valve 14 is connected to the line 16 and thus to the fluid pump 13 via the hydraulic connection 18.
  • the calibration valve 14 is set up to open at a predetermined pressure, for example 8 bar.
  • the electric motor 11 is controlled by the motor control device 12 in such a way that the fluid pump 13 runs at a specific speed of the motor 11. In an alternative embodiment, no calibration valve 14 is provided.
  • a filter 16a is installed in line 16. It is a fuel filter. In other configurations, other filters or components that influence the fluid can be involved. In a further embodiment, the filter 16a can also be omitted.
  • a pressure sensor 19 is also connected to line 16.
  • the pressure sensor 19 measures a fluid pressure in the line 16 downstream of the filter 16a.
  • the signal of the pressure sensor 19 is evaluated in an evaluation unit 19a.
  • the evaluation unit 19a provides the engine control unit 12, in the exemplary embodiment of the computing unit 12a of the engine control unit 12, with an evaluated pressure signal for plausibility checking.
  • Figure 2 shows a graph which represents a drive current for the electric motor 11 (ordinate axis) over the rotational speed (abscissa axis) for various pressures.
  • the pressures increase from function 21 to 22 up to function 25.
  • Figure 3 shows an example of a schematic representation of a characteristic field of an industrial pump in general.
  • the delivery head (ordinate axis) is applied above the speed (abscissa axis).
  • This example is the " Pump manual "2004, GRUNDFOS, page 119 , taken.
  • FIG. 4 shows a flow diagram according to an embodiment of the method.
  • a drive current is set to a predetermined value, for example 3A.
  • a flow volume of the fluid delivery system 10 is changed.
  • a corresponding, characteristic pressure behavior can be generated in the fluid delivery system 10 for the control current set in step 41.
  • the speed is proportional to the delivery volume of the fluid pump 13.
  • the change in the flow volume is achieved automatically, for example, by building up a pressure increase in the fluid delivery system 10. This can also take place during operation, for example when the fluid delivery system 10 is started up.
  • step 43 pressure data of the fluid delivery system 10 are recorded.
  • the pressure sensor 19 is used for this. This creates a volume of data that represents the pressure in the fluid delivery system for the selected control current as a function of the changed flow volume.
  • step 44 it is evaluated whether all the specified values for creating the characteristic field are available. If, for example, there is a lack of data on a specific predetermined drive current for the electric motor 11, the steps 41, 42 and 43 are repeated with correspondingly changed parameters.
  • a characteristic field is created from the recorded data. For this purpose, pressure values for a set control current are assigned to a speed.
  • the characteristic field is leveled and aligned using anchor points and boundary parameters as described below.
  • Figure 5 shows an example of such a characteristic field.
  • the individual functions increase from bottom to top and represent a control current.
  • the speed is plotted on the abscissa axis, the pressure in the fluid delivery system 10 on the ordinate axis characteristic parameters are run. It is therefore necessary to level the characteristic field.
  • the zero delivery rate of the fluid pump 13 is used for a fluid pump 13 for pumping gasoline. Further parameters result from a maximum speed of the electric motor 11, a maximum delivery volume of the fluid pump 13 or a minimum operating current of the electric motor 11. These parameters are in each case characteristic of different, specific fluids at different pressures. In the case of the zero delivery rate, the outlet pressure and the applied pressure at the fluid pump 13 are identical, so that the fluid is not delivered and a delivery volume is therefore zero. These Parameters and the resulting measurement data serve as anchor points for the characteristic field.
  • FIG. 6 shows a schematic representation of a controlled system.
  • Block 61 represents a control module that uses a characteristic field for a gasoline fluid system for control purposes.
  • the block 61 has two inputs 62, 63, an input 62 is for the speed and input 63 is for the drive current.
  • the output variable of block 61 is a pressure value 64.
  • Figure 7 shows an example of a characteristic field for a diesel fluid delivery system.
  • the pressure plotted against the speed are the individual diagonal curves of increasing current from bottom to top.
  • an additional calibration valve 14 is used in the fluid delivery system 10 in a further embodiment.
  • the calibration valve 14 generates, as in Figure 8 shown, a kink in the pressure characteristic curves 81 to 84. This allows the characteristic curve field for the control current to be leveled, since an anchor point is created for alignment.
  • Figure 10 shows a further representation for a characteristic field for diesel. Important anchor points are also not defined here.
  • a special calibration valve 14 is used.
  • a different number and different configurations of valves are conceivable in different configurations.
  • a limited valve as shown schematically in FIG. 11, is used. Once opened, the limited valve only allows a defined amount (bypass amount) to drain. For example, the limited valve opens at 3 bar and then allows a constant flow of 5 l / h.
  • a pressure-dependent inlet 112 leads to a resistor (valve flap), which is represented schematically by a spring 110. If the pressure is high enough, the outlet 111 is opened and the fluid can flow away.
  • FIG 12 shows a schematic representation of a calibration valve 14 according to a further embodiment.
  • the calibration valve 14 is a step valve.
  • the step valve enables different bypass quantities of the fluid to flow off at different pressure levels. For example, 5 1 / h at 3 bar. and from 4 bar 10 l / h derived.
  • a pressure-dependent inlet 121 leads to a resistance (valve flap), which is represented schematically by a spring 120. If the pressure is high enough, the outlet 121 is opened and the fluid can flow away. If the pressure continues to rise, the outlet 122 is additionally opened, so that the discharge quantity increases.
  • valve flap resistance
  • the outlet 121 is opened and the fluid can flow away.
  • the outlet 122 is additionally opened, so that the discharge quantity increases.
  • different numbers of stages with different values and outlet pressures are conceivable. It is important here that the recorded pressure characteristics of the fluid pump 13 have different buckling levels exhibit. The characteristic field of the control current curves can be leveled using this.
  • a further embodiment of the calibration valve 14 is a step valve that only allows an outflow within a certain pressure range.
  • Figure 13 shows a schematic representation of such a valve. The valve is closed at 1 bar, opened at 2 bar and closes again completely at 3 bar. Between 2.3 bar, a constant amount of 5 1 / hour. drained.
  • a pressure coupling 131 leads to a resistor, which is represented schematically by a spring 130. If the pressure is high enough, the bypass volume inlet 132 is released and the fluid can flow off via the bypass volume outlet 133, which is also released. If the pressure continues to rise, the valve closes.
  • Figure 14 shows different pump characteristics. Pressure characteristics of the fluid delivery system 10 are shown in bold (abscissa axis: speed; ordinate axis: pressure and control current). It can be seen here that the pressure characteristics shown in bold have different kinks. The characteristic field of the control current (thin lines) can now be leveled on the basis of these kinks. The measurement can be speed controlled. That is, the speed is reduced by the control of the electric motor 11. This can be done, for example, when the fluid pump 13 is switched on.
  • Figure 15 shows similar to Figure 14 Different characteristics, but for different valve types (axis of abscissa: speed; axis of ordinate: pressure and control current).
  • the additional characteristics provided by the modified valve enable flawless calibration during operation of the fluid delivery system under various realistic conditions.
  • the current control can be switched on slightly below the expected operating point and the control current can be increased slightly. As soon as a speed jump occurs, it can be assumed that a calibration valve opens and the characteristic field can be aligned at this anchor point. This control current can be used to level the characteristic field. In the further work operation, speed-controlled work can be continued. Such a leveling can be used at any time, also and especially during operation. Such a bypass function has no effect on operation and does not influence the characteristic field of the control current (compare Figure 10 ). The characteristic field remains identical even when using the bypass valve or stepped valve (generally the calibration valve 14).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Erstellen eines Kennlinienfelds einer Fluidpumpe eines druckabhängigen Fluidfördersystems für einen Arbeitsbereich der Fluidpumpe. Die Erfindung betrifft des Weiteren die Verwendung eines limitierten Ventils, die Verwendung eines Stufenventils und ein Steuergerät für ein Fluidfördersystem.The invention relates to a method for creating a characteristic field of a fluid pump of a pressure-dependent fluid delivery system for a working area of the fluid pump. The invention further relates to the use of a limited valve, the use of a step valve and a control device for a fluid delivery system.

Fluidfördersysteme werden beispielsweise als Kraftstofffördersysteme in Kraftfahrzeugen eingesetzt. Derartige Fluidfördersysteme weisen eine Fluidpumpe auf, die von einem elektrischen Motor angetrieben wird und sind druckabhängig. Dokument US 2014/105758 A1 offenbart ein Closed Loop-Steuersystem für eine Kraftstoffpumpe, welches eine Kalibrierfunktionalität umfasst und eine nutzbringende Druckregulierung ermöglicht. Dabei ist ein vom Pumpensystem erzeugter Druck durch Messen eines charakteristischen Phasenstromes als eine Funktion der Geschwindigkeit einstellbar.Fluid delivery systems are used, for example, as fuel delivery systems in motor vehicles. Such fluid delivery systems have a fluid pump which is driven by an electric motor and are pressure-dependent. document US 2014/105758 A1 discloses a closed loop control system for a fuel pump that includes calibration functionality and enables useful pressure regulation. A pressure generated by the pump system can be adjusted by measuring a characteristic phase current as a function of the speed.

Dokument WO 2008/067622 A2 offenbart ein Verfahren und eine Vorrichtung zum Kontrollieren eines Kraftstoffdurchflusses in einem Verbrennungsmotor. Zu diesem Zweck ist ein Steuersystem vorgesehen, welches einen Kraftstoffdurchfluss bereitstellt, der in Bezug auf eine Strömungsrate dem Kraftstoffbedarf des Verbrennungsmotors entspricht. In Dokument DE 102011015154 A1 ist ein Verfahren zur Überwachung einer elektromotorisch angetriebenen Kraftstoffpumpe beschrieben. Bei einer Überwachung einer elektromotorisch angetriebenen Kraftstoffpumpe einer Kraftstofffördereinheit für ein Kraftfahrzeug wird ein Pumpen strom in Abhängigkeit von einer Pumpenspannung oder einer Pumpendrehzahl überwacht.document WO 2008/067622 A2 discloses a method and apparatus for controlling fuel flow in an internal combustion engine. For this purpose, a control system is provided which provides a fuel flow which corresponds to the fuel requirement of the internal combustion engine with respect to a flow rate. In document DE 102011015154 A1 describes a method for monitoring an electric motor-driven fuel pump. When monitoring an electric motor driven fuel pump of a fuel delivery unit for a motor vehicle, a pumping is carried out current is monitored depending on a pump voltage or a pump speed.

Zur Steuerung eines Ansteuerstroms des elektrischen Motors zur Regelung der Fluidpumpe ist es vorteilhaft, einen Zusammenhang zum Druck im Fluidfördersystem herzustellen. Eine derartige Beziehung zwischen dem Ansteuerstrom für den elektrischen Motor und dem Druck in dem Fluidfördersystem kann mittels eines Kennlinienfelds hergestellt werden. Werte zur Ansteuerung können aus dem Kennlinienfeld ausgelesen werden.To control a drive current of the electric motor for regulating the fluid pump, it is advantageous to establish a connection to the pressure in the fluid delivery system. Such a relationship between the drive current for the electric motor and the pressure in the fluid delivery system can be established by means of a characteristic field. Control values can be read from the characteristic field.

Aufgabe der Erfindung ist es, ein Verfahren zur verbesserten Erstellung eines Kennlinienfelds einer Fluidpumpe eines druckabhängigen Fluidfördersystems für einen Arbeitsbereich der Fluidpumpe aufzuzeigen. Es ist weiter Aufgabe der Erfindung, die Verwendung eines limitierten Ventils und die Verwendung eines Stufenventils als Kalibrierventile sowie ein Steuergerät für ein Fluidfördersystem aufzuzeigen.The object of the invention is to provide a method for the improved creation of a characteristic field of a fluid pump of a pressure-dependent fluid delivery system for a working area of the fluid pump. It is a further object of the invention to demonstrate the use of a limited valve and the use of a step valve as calibration valves as well as a control device for a fluid delivery system.

Gemäß einem ersten Aspekt der Erfindung wird die Aufgabe durch ein Verfahren zum Erstellen eines Kennlinienfelds einer Fluidpumpe eines druckabhängigen Fluidfördersystems in einem Arbeitsbereich der Fluidpumpe gelöst. Das Fluidfördersystem umfasst hierbei einen stromgesteuerten elektrischen Motor, der von einem Motorsteuergerät mit einem Ansteuerstrom angesteuert wird. Die Fluidpumpe wird von dem elektrischen Motor angetrieben. Das Verfahren umfasst hierbei die Schritte:

  • Einstellen des Ansteuerstroms auf einen vorbestimmten Wert;
  • Verändern eines Durchflussvolumens des Fluidfördersystems, nachdem der Ansteuerstrom eingestellt ist;
  • Aufnehmen einer einen Druck in dem Fluidfördersystem beschreibende Datenmenge in Abhängigkeit der Veränderung des Durchflussvolumens;
  • Wiederholen der Schritte des Einstellens, Veränderns und Aufnehmens für eine vorbestimmte Anzahl an Wiederholungen und vorbestimmte, verschiedene Ansteuerströme; und
  • Erstellen eines Kennlinienfelds aus der aufgenommenen Datenmenge.
According to a first aspect of the invention, the object is achieved by a method for creating a characteristic field of a fluid pump a pressure-dependent fluid delivery system in a working area of the fluid pump solved. The fluid delivery system in this case comprises a current-controlled electric motor which is controlled by a motor control device with a drive current. The fluid pump is driven by the electric motor. The process comprises the following steps:
  • Setting the drive current to a predetermined value;
  • Changing a flow volume of the fluid delivery system after the drive current is set;
  • Recording a quantity of data describing a pressure in the fluid delivery system as a function of the change in the flow volume;
  • Repeating the steps of setting, changing and recording for a predetermined number of repetitions and predetermined different drive currents; and
  • Creation of a characteristic field from the recorded amount of data.

Durch die Erstellung des Kennlinienfelds aus der aufgenommenen Datenmenge können Daten, die zur Einstellung des elektrischen Motors dienen, direkt aus dem Kennlinienfeld ausgelesen werden.By creating the characteristic field from the recorded amount of data, data that are used to adjust the electric motor can be read directly from the characteristic field.

Gemäß einer vorteilhaften Ausgestaltung umfasst das Verfahren zusätzlich den folgenden Schritt:

  • Bestimmen von Randbereichen und/oder Randpunkten des Kennlinienfelds basierend auf das Fluidfördersystem charakterisierenden Parametern.
According to an advantageous embodiment, the method additionally comprises the following step:
  • Determining edge regions and / or edge points of the characteristic field based on parameters characterizing the fluid delivery system.

Ein Vorteil hierbei ist es, dass das Kennlinienfeld Bereichen und Werten von Druck- und Drehzahl zugeordnet und somit nivelliert werden kann. Beispielsweise ist das Fluidfördersystem als Kraftstofffördersystem für ein Kraftfahrzeug ausgebildet und für Benzin ausgelegt. Das Aufgenommene Kennlinienfeld umfasst Kennlinien konstanten Ansteuerstroms, die eine Abhängigkeit zwischen Drehzahl der Fluidpumpe und dem Druck im Fluidfördersystem herstellen.One advantage of this is that the characteristic field can be assigned to areas and values of pressure and speed and can thus be leveled. For example, the fluid delivery system is designed as a fuel delivery system for a motor vehicle and is designed for gasoline. The recorded characteristic field comprises characteristic curves of constant control current, which are a dependency between the speed of the fluid pump and the pressure in the fluid delivery system.

Gemäß einer weiteren Ausgestaltung umfasst das Verfahren zusätzlich den folgenden Schritt:

  • Kalibrieren des Kennlinienfelds durch Abfahren wenigstens eines Teilbereichs einer Kennlinie.
According to a further embodiment, the method additionally comprises the following step:
  • Calibration of the characteristic field by traversing at least a partial area of a characteristic.

Dadurch, dass wenigstens ein Teil der Kennlinie abgefahren wird, kann unkompliziert und praktisch eine Zuordnung des Kennlinienfelds stattfinden. Das Fluidfördersystem ist beispielsweise als Kraftstofffördersystem für ein Kraftfahrzeug ausgebildet und für Diesel ausgelegt. Da Fluidpumpen für Diesel anders konstruiert sind als Benzinpumpen, kann durch diese Ausgestaltung eine Nivellierung des Kennlinienfelds genauer erfolgen.Because at least part of the characteristic curve is traversed, the characteristic field can be assigned in an uncomplicated and practical manner. The fluid delivery system is designed, for example, as a fuel delivery system for a motor vehicle and is designed for diesel. Since fluid pumps for diesel are designed differently than petrol pumps, this configuration allows the characteristic field to be leveled more precisely.

Gemäß einer vorteilhaften Ausgestaltung umfassen die das Fluidfördersystem charakterisierenden Parameter, wenigstens einen der folgenden Parameter:

  • Nullfördermenge der Fluidpumpe;
  • maximale Drehzahl des elektrischen Motors;
  • maximales Fördervolumen der Fluidpumpe;
  • minimaler Betriebsstrom des elektrischen Motors.
According to an advantageous embodiment, the parameters characterizing the fluid delivery system include at least one of the following parameters:
  • Zero delivery rate of the fluid pump;
  • maximum speed of the electric motor;
  • maximum delivery volume of the fluid pump;
  • minimum operating current of the electric motor.

Vorteilhaft bei der Verwendung solcher charakterisierenden Parameter ist, sodass diese Parameter einfach zu erlangen sind. Somit kann bei jedem Fluidfördersystem ein Ansatzpunkt für die Zuordnung des Kennfelds stattfinden. Unterschiedliche Pumpentypen verlangen jedoch möglicherweise unterschiedliche Parameter. Eine Verdrängerpumpe, beispielsweise für Diesel, kann bauartbedingt nicht bei der Nullfördermenge betrieben werden.It is advantageous when using such characterizing parameters so that these parameters are easy to obtain. In this way, a starting point for assigning the characteristic map can take place in any fluid delivery system. However, different types of pumps may require different parameters. A positive displacement pump, for example for diesel, cannot be operated at zero flow due to its design.

Gemäß einer weiteren vorteilhaften Ausgestaltung umfasst das Fluidfördersystem weiter ein Kalibrierventil, das an einer Auslassseite der Fluidpumpe angeordnet ist und sich in Abhängigkeit eines vorbestimmten Drucks öffnet, um eine druckabhängige Kalibrierfunktion bereitzustellen und wobei der Schritt des Aufnehmens zusätzlich von der Kalibrierfunktion abhängt.According to a further advantageous embodiment, the fluid delivery system further comprises a calibration valve, which is located on an outlet side the fluid pump is arranged and opens as a function of a predetermined pressure in order to provide a pressure-dependent calibration function and the step of taking up additionally depends on the calibration function.

Durch ein Kalibrierventil kann eine eindeutige Zuordnung von Ansteuerstrom und Druck stattfinden. Dies wird dadurch erreicht, dass in einer aufgenommenen Druckkennlinie durch das Öffnen des Ventils ein Knick erzeugt wird. Dieser unterstützt die Nivellierung des später aufgenommenen Kennlinienfelds für den Ansteuerstrom.A calibration valve can uniquely assign the control current and pressure. This is achieved in that a kink is created in a recorded pressure characteristic by opening the valve. This supports the leveling of the characteristic field for the control current that is recorded later.

Gemäß einer weiteren vorteilhaften Ausgestaltung ist das Kalibrierventil als eines der folgenden Ventilarten ausgebildet: Schwellendruckventil; limitiertes Ventil; Stufenventil.According to a further advantageous embodiment, the calibration valve is designed as one of the following valve types: threshold pressure valve; limited valve; Step valve.

Vorteilhaft bei der Ausbildung als eines dieser Ventile ist es, dass diese Ventiltypen jeweils einen oder mehrere Knicke in der Druckkennlinie des Fluidfördersystems erzeugen, und somit weitere Ankerpunkte für ein Nivellieren des Kennlinienfelds ermöglichen.It is advantageous for the design as one of these valves that these valve types each produce one or more kinks in the pressure characteristic of the fluid delivery system, and thus enable further anchor points for leveling the characteristic field.

Gemäß einer weiteren vorteilhaften Ausgestaltung ist das Kalibrierventil dazu ausgebildet, einen vorbestimmten maximalen Volumenstrom aus dem Fluidfördersystem abzuleiten, wenn das Kalibrierventil als limitiertes Ventil ausgebildet ist. Alternativ ist das Kalibrierventil dazu ausgebildet, pro Stufe einen vorbestimmten maximalen Volumenstrom aus dem Fluidfördersystem abzuleiten, wenn das Kalibrierventil als Stufenventil ausgebildet ist.According to a further advantageous embodiment, the calibration valve is designed to derive a predetermined maximum volume flow from the fluid delivery system if the calibration valve is designed as a limited valve. Alternatively, the calibration valve is designed to derive a predetermined maximum volume flow from the fluid delivery system for each stage if the calibration valve is designed as a stage valve.

Eine Zuordnung der zusätzlichen Ankerpunkte für das Kennlinienfeld kann verlässlicher stattfinden, wenn die abgeleiteten Volumenströme vordefiniert sind.An assignment of the additional anchor points for the characteristic field can take place more reliably if the derived volume flows are predefined.

Gemäß einer weiteren vorteilhaften Ausgestaltung erfolgt der Schritt des Einstellens des Ansteuerstroms und des Veränderns eines Durchflussvolumens im Anschluss an ein Einschalten der Fluidpumpe.According to a further advantageous embodiment, the step of setting the drive current and changing a flow volume takes place after the fluid pump has been switched on.

Somit kann bei Beginn des Förderns durch das Fluidfördersystems eine aktuelle Kalibrierung des Kennlinienfelds stattfinden. Dies erhöht die Genauigkeit von dem Fluidfördersystem, speziell in Hinsicht auf Alterungsprozesse.Thus, a current calibration of the characteristic field can take place at the beginning of the delivery by the fluid delivery system. This increases the accuracy of the fluid delivery system, especially with regard to aging processes.

Gemäß einem zweiten Aspekt der Erfindung wird ein limitiertes Ventil als Kalibrierventil in einem Kraftstofffördersystem verwendet. Hierbei kann ein Verfahren nach dem ersten Aspekt durchgeführt werden.According to a second aspect of the invention, a limited valve is used as a calibration valve in a fuel delivery system. Here, a method can be carried out according to the first aspect.

Gemäß einem dritten Aspekt der Erfindung wird ein Stufenventil als Kalibrierventil in einem Fluidfördersystem eingerichtet. Hierbei kann ebenso ein Verfahren nach dem ersten Aspekt durchgeführt werden.According to a third aspect of the invention, a step valve is set up as a calibration valve in a fluid delivery system. A method according to the first aspect can also be carried out here.

Gemäß einem vierten Aspekt der Erfindung wird ein Steuergerät für ein Fluidfördersystem beschrieben. Das Fluidfördersystem umfasst:

  • einen stromgesteuerten elektrischen Motor, der von einem Motorsteuergerät geregelt wird; und
  • eine Fluidpumpe, die von dem elektrischen Motor angetrieben wird.
According to a fourth aspect of the invention, a control device for a fluid delivery system is described. The fluid delivery system includes:
  • a current controlled electric motor controlled by an engine control unit; and
  • a fluid pump driven by the electric motor.

Das Steuergerät ist hierbei dazu eingerichtet, ein Verfahren nach dem ersten Aspekt durchzuführen.The control unit is set up to carry out a method according to the first aspect.

Die Erfindung wird im Folgenden anhand von Figuren und Ausführungsbeispielen näher erläutert. Es zeigen:

Figur 1
ein Fluidfördersystem (schematische Darstellung);
Figur 2
ein Feld mehrerer Druckkennlinien eines Fluidsystems;
Figur 3
eine exemplarische Darstellung eines Kennlinienfelds einer Industriepumpe (Pumpenhandbuch 2004, GRUNDFOS, Seite 119);
Figur 4
ein Flussdiagramm für ein Verfahren gemäß einer Ausgestaltung der Erfindung;
Figur 5
eine exemplarische Darstellung eines Kennlinienfelds einer Fluidpumpe gemäß einer Ausgestaltung der Erfindung;
Figur 6
eine schematische Darstellung einer Regelstrecke;
Figur 7
eine weitere exemplarische Darstellung eines Kennlinienfelds einer Fluidpumpe gemäß einer Ausgestaltung der Erfindung;
Figur 8
eine weitere exemplarische Darstellung eines Kennliniefelds mehrerer Druckkennlinien eines Fluidsystems;
Figur 9
zwei exemplarische Kennlinienfelder mit Markierungen für eine Nivellierung;
Figur 10
ein weiteres exemplarisches Kennlinienfeld mit Nivellierungsmarkierugen;
Figur 11
eine schematische Darstellung eines Ventils;
Figur 12
eine weitere schematische Darstellung eines Ventils;
Figur 13
eine weitere schematische Darstellung eines Ventils;
Figur 14
ein exemplarisches Kennlinienfeld von Druckkennlinien und Stromkennlinien und
Figur 15
ein weiteres exemplarisches Kennlinienfeld von Drucckennlinien und Stromkennlinien.
The invention is explained in more detail below with reference to figures and exemplary embodiments. Show it:
Figure 1
a fluid delivery system (schematic representation);
Figure 2
an array of several pressure characteristics of a fluid system;
Figure 3
an exemplary representation of a characteristic field of an industrial pump (Pump Manual 2004, GRUNDFOS, page 119);
Figure 4
a flowchart for a method according to an embodiment of the invention;
Figure 5
an exemplary representation of a characteristic field of a fluid pump according to an embodiment of the invention;
Figure 6
a schematic representation of a controlled system;
Figure 7
a further exemplary representation of a characteristic field of a fluid pump according to an embodiment of the invention;
Figure 8
a further exemplary representation of a characteristic field of several pressure characteristic curves of a fluid system;
Figure 9
two exemplary characteristic curve fields with markings for leveling;
Figure 10
another exemplary characteristic field with leveling markings;
Figure 11
a schematic representation of a valve;
Figure 12
another schematic representation of a valve;
Figure 13
another schematic representation of a valve;
Figure 14
an exemplary characteristic field of pressure characteristics and current characteristics and
Figure 15
another exemplary characteristic field of pressure characteristic curves and current characteristic curves.

Figur 1 zeigt ein Fluidfördersystem 10. Das Fluidfördersystem 10 ist im Ausführungsbeispiel ein Kraftstofffördersystem zum Fördern von Benzin aus einem Tank. In einer anderen Ausgestaltung kann das Fluidfördersystem 10 zum Fördern von Diesel ausgelegt sein. Der Kraftstoff, hier das Benzin, wird durch das Fluidfördersystem 10 einer Einspritzanlage (sogenanntes Fuel Rail-System) zugeführt. Aus Gründen der Übersichtlichkeit wurde in Figur 1 auf eine Darstellung sowohl des Tanks, als auch der Einspritzanlage verzichtet. Im Ausführungsbeispiel handelt es sich um ein sogenanntes Vorfördersystem. Ebenso kann es sich in anderen Ausgestaltungen um andere Fluidfördersysteme oder Teile eines Fluidfördersystems handeln. Figure 1 shows a fluid delivery system 10. In the exemplary embodiment, the fluid delivery system 10 is a fuel delivery system for delivering gasoline from a tank. In another embodiment, the fluid delivery system 10 can be designed to deliver diesel. The fuel, here the gasoline, is fed through the fluid delivery system 10 to an injection system (so-called fuel rail system). For reasons of clarity, in Figure 1 no representation of both the tank and the injection system. In the exemplary embodiment, it is a so-called pre-conveyor system. Other configurations may also be different fluid delivery systems or parts of a fluid delivery system.

Im Ausführungsbeispiel umfasst das Fluidfördersystem 10 einen elektrischen Motor 11. Der elektrische Motor 11 ist im Ausführungsbeispiel stromgesteuert. Der elektrische Motor 11 wird von einem Motorsteuergerät 12 angesteuert. Das Motorsteuergerät hat im Ausführungsbeispiel eine Ansteuereinheit und eine zusätzliche Recheneinheit 12a. Die Recheneinheit 12a ist in alternativen Ausgestaltungen räumlich von dem Motorsteuergerät 12 getrennt und somit ausgelagert. Der elektrische Motor 11 treibt eine Fluidpumpe 13 an. Die Fluidpumpe 13 ist im Ausführungsbeispiel eine Kraftstoffpumpe. Der elektrische Motor 11 ist über eine mechanische Kopplung 17 mit der Fluidpumpe 13 verbunden. Die Fluidpumpe 13 pumpt Benzin über eine Fluidleitung 15 von dem Tank durch das Fluidfördersystem 10 und über eine Leitung 16 zu der Einspritzanlage. An einer Auslassseite der Fluidpumpe 13 ist ein Kalibrierventil 14 angeschlossen und mit der Fluidpumpe 13 hydraulisch gekoppelt. Hierbei ist das Kalibrierventil 14 über die hydraulische Verbindung 18 mit der Leitung 16 und somit mit der Fluidpumpe 13 verbunden. Das Kalibrierventil 14 ist dazu eingerichtet, bei einem vorbestimmten Druck, beispielsweise 8 bar, zu öffnen. Der elektrische Motor 11 wird von dem Motorsteuergerät 12 so gesteuert, dass die Fluidpumpe 13 mit einer bestimmten Drehzahl des Motors 11 läuft. In einer alternativen Ausgestaltung ist kein Kalibrierventil 14 vorgesehen.In the exemplary embodiment, the fluid delivery system 10 comprises an electric motor 11. The electric motor 11 is current-controlled in the exemplary embodiment. The electric motor 11 is controlled by an engine control unit 12. In the exemplary embodiment, the engine control unit has a control unit and an additional computing unit 12a. In alternative configurations, the computing unit 12a is spatially separated from the engine control unit 12 and is therefore outsourced. The electric motor 11 drives a fluid pump 13. In the exemplary embodiment, the fluid pump 13 is a fuel pump. The electric motor 11 is connected to the fluid pump 13 via a mechanical coupling 17. The fluid pump 13 pumps gasoline via a fluid line 15 from the tank through the fluid delivery system 10 and via a line 16 to the injection system. On an outlet side of the fluid pump 13, a calibration valve 14 is connected and hydraulically coupled to the fluid pump 13. Here, the calibration valve 14 is connected to the line 16 and thus to the fluid pump 13 via the hydraulic connection 18. The calibration valve 14 is set up to open at a predetermined pressure, for example 8 bar. The electric motor 11 is controlled by the motor control device 12 in such a way that the fluid pump 13 runs at a specific speed of the motor 11. In an alternative embodiment, no calibration valve 14 is provided.

In die Leitung 16 ist ein Filter 16a eingebaut. Es handelt sich hierbei um einen Kraftstofffilter. In anderen Ausgestaltungen kann es sich um andere Filter oder fluidbeeinflussende Komponenten handeln. Der Filter 16a kann in einer weiteren Ausgestaltung auch entfallen.A filter 16a is installed in line 16. It is a fuel filter. In other configurations, other filters or components that influence the fluid can be involved. In a further embodiment, the filter 16a can also be omitted.

An die Leitung 16 ist des Weiteren ein Drucksensor 19 angeschlossen. Im Ausführungsbeispiel misst der Drucksensor 19 einen Fluiddruck in der Leitung 16 nach dem Filter 16a. Das Signal des Drucksensors 19 wird in einer Auswertungseinheit 19a ausgewertet. Die Auswertungseinheit 19a stellt dem Motorsteuergerät 12, im Ausführungsbeispiel der Recheneinheit 12a des Motorsteuergeräts 12, ein ausgewertetes Drucksignal zur Plausibilisierung bereit.A pressure sensor 19 is also connected to line 16. In the exemplary embodiment, the pressure sensor 19 measures a fluid pressure in the line 16 downstream of the filter 16a. The signal of the pressure sensor 19 is evaluated in an evaluation unit 19a. The evaluation unit 19a provides the engine control unit 12, in the exemplary embodiment of the computing unit 12a of the engine control unit 12, with an evaluated pressure signal for plausibility checking.

Figur 2 zeigt einen Graphen, der einen Ansteuerstrom für den elektrischen Motor 11 (Ordinatenachse) über die Drehzahl (Abszissenachse) für verschiedene Drücke darstellt. Die Drücke sind von Funktion 21 über 22 bis hin zu Funktion 25 hin steigend. Figure 2 shows a graph which represents a drive current for the electric motor 11 (ordinate axis) over the rotational speed (abscissa axis) for various pressures. The pressures increase from function 21 to 22 up to function 25.

Eine derartige Darstellung ist jedoch wenig geeignet, um eine Regelung der Fluidpumpe 13 vorzunehmen, da das Ergebnis des Kennlinienfelds Strom ist, wobei Strom eine Eingangsgröße war. Ein Auslesen von Werten für eine Steuerung des Fluidfördersystems 10 ist daher nicht ohne Umrechnung möglich.However, such a representation is not very suitable for regulating the fluid pump 13, since the result of the characteristic field is current, current being an input variable. Reading values for a control of the fluid delivery system 10 is therefore not possible without conversion.

Figur 3 zeigt beispielhaft eine schematische Darstellung eines Kennlinienfelds einer Industriepumpe im Allgemeinen. Hierbei wird die Förderhöhe (Ordinatenachse) über der Drehzahl (Abszissenachse) aufgebracht. Dieses Beispiel ist dem " Pumpenhandbuch" 2004, GRUNDFOS, Seite 119 , entnommen. Figure 3 shows an example of a schematic representation of a characteristic field of an industrial pump in general. The delivery head (ordinate axis) is applied above the speed (abscissa axis). This example is the " Pump manual "2004, GRUNDFOS, page 119 , taken.

Eine derartige Darstellung wäre auch wünschenswert für die verwendete Fluidpumpe 13.Such a representation would also be desirable for the fluid pump 13 used.

Figur 4 zeigt ein Flussdiagramm gemäß einer Ausgestaltung des Verfahrens. Im Schritt 41 wird ein Ansteuerstrom auf einen vorbestimmten Wert gesetzt, beispielsweise 3A. Figure 4 shows a flow diagram according to an embodiment of the method. In step 41, a drive current is set to a predetermined value, for example 3A.

In Schritt 42 wird ein Durchflussvolumen des Fluidfördersystems 10 verändert. Durch die Veränderung des Durchflussvolumens kann zu dem in Schritt 41 eingestellten Ansteuerstrom ein entsprechendes, charakteristisches Druckverhalten im Fluidfördersystem 10 erzeugt werden. Im Fluidfördersystem 10 gilt hierbei, dass die Drehzahl proportional zum Fördervolumen der Fluidpumpe 13 ist. Die Veränderung des Durchflussvolumens wird hierbei beispielsweise automatisch erzielt, indem eine Druckerhöhung im Fluidfördersystem 10 aufgebaut wird. Dies kann auch im laufenden Betrieb erfolgen, beispielsweise bei einem Hochfahren des Fluidfördersystems 10.In step 42, a flow volume of the fluid delivery system 10 is changed. By changing the flow volume, a corresponding, characteristic pressure behavior can be generated in the fluid delivery system 10 for the control current set in step 41. In the fluid delivery system 10, the speed is proportional to the delivery volume of the fluid pump 13. The change in the flow volume is achieved automatically, for example, by building up a pressure increase in the fluid delivery system 10. This can also take place during operation, for example when the fluid delivery system 10 is started up.

In Schritt 43 werden Druckdaten des Fluidfördersystems 10 aufgezeichnet. Hierfür wird beispielsweise der Drucksensor 19 verwendet. Hierdurch entsteht eine Datenmenge, die zu dem eingestellten Ansteuerstrom in Abhängigkeit des veränderten Durchflussvolumens dem Druck im Fluidfördersystem darstellt.In step 43, pressure data of the fluid delivery system 10 are recorded. For example, the pressure sensor 19 is used for this. This creates a volume of data that represents the pressure in the fluid delivery system for the selected control current as a function of the changed flow volume.

In Schritt 44 wird ausgewertet, ob alle vorgegebenen Werte für die Erstellung des Kennlinienfelds vorhanden sind. Fehlen beispielsweise Daten zu einem bestimmten vorgegebenen Ansteuerstrom für den elektrischen Motor 11, so werden die Schritte 41, 42 und 43 mit entsprechend veränderten Parametern wiederholt.In step 44, it is evaluated whether all the specified values for creating the characteristic field are available. If, for example, there is a lack of data on a specific predetermined drive current for the electric motor 11, the steps 41, 42 and 43 are repeated with correspondingly changed parameters.

In Schritt 45 wird ein Kennlinienfeld aus den aufgezeichneten Daten erstellt. Hierzu werden jeweils Druckwerte zu einem eingestellten Ansteuerstrom einer Drehzahl zugeordnet. Das Kennlinienfeld wird anhand von Ankerpunkten und Randparametern wie unten beschrieben nivelliert und ausgerichtet.In step 45, a characteristic field is created from the recorded data. For this purpose, pressure values for a set control current are assigned to a speed. The characteristic field is leveled and aligned using anchor points and boundary parameters as described below.

Figur 5 zeigt beispielhaft ein derartiges Kennlinienfeld. Die einzelnen Funktionen von unten nach oben hin steigend und stellen einen Ansteuerstrom dar. Auf der Abszissenachsen-Achse ist die Drehzahl aufgetragen, auf der Ordinaten-Achse der Druck im Fluidfördersystem 10. Um auch die Randbereiche des Kennlinienfelds korrekt darzustellen, ist es notwendig, dass charakteristische Parameter abgefahren werden. Es ist also eine Nivellierung des Kennlinienfelds notwendig. Figure 5 shows an example of such a characteristic field. The individual functions increase from bottom to top and represent a control current. The speed is plotted on the abscissa axis, the pressure in the fluid delivery system 10 on the ordinate axis characteristic parameters are run. It is therefore necessary to level the characteristic field.

Diese Parameter werden im Verfahren des Ausführungsbeispiels, wie im Flussdiagramm in Figur 4 dargestellt in Schritt 45 auf das Kennlinienfeld aufgerechnet. Je nach Fluidfördersystem 10 können sich hierbei unterschiedliche Parameter eignen. Beispielsweise wird für eine Fluidpumpe 13 zum Pumpen von Benzin die Nullfördermenge der Fluidpumpe 13 verwendet. Weitere Parameter ergeben sich aus einer maximalen Drehzahl des elektrischen Motors 11, einem maximalen Fördervolumen der Fluidpumpe 13 oder einem minimalen Betriebsstrom des elektrischen Motors 11. Diese Parameter sind jeweils charakteristisch für unterschiedliche, bestimmte Fluide bei unterschiedlichen Drücken. Ausgangsdruck und anliegender Druck bei der Fluidpumpe 13 sind, im Falle der Nullfördermenge, identisch, so dass das Fluid nicht befördert wird und ein Fördervolumen somit Null ist. Diese Parameter und die hieraus resultierenden Messdaten dienen als Ankerpunkte für das Kennlinienfeld.These parameters are in the method of the embodiment, as in the flowchart in Figure 4 shown in step 45 added to the characteristic field. Depending on the fluid delivery system 10, different parameters may be suitable. For example, the zero delivery rate of the fluid pump 13 is used for a fluid pump 13 for pumping gasoline. Further parameters result from a maximum speed of the electric motor 11, a maximum delivery volume of the fluid pump 13 or a minimum operating current of the electric motor 11. These parameters are in each case characteristic of different, specific fluids at different pressures. In the case of the zero delivery rate, the outlet pressure and the applied pressure at the fluid pump 13 are identical, so that the fluid is not delivered and a delivery volume is therefore zero. These Parameters and the resulting measurement data serve as anchor points for the characteristic field.

Figur 6 zeigt eine schematische Darstellung einer Regelstrecke. Im Ausführungsbeispiel einer Regelstrecke des Computerprogramms. Block 61 stellt einen Regelbaustein dar, der zur Regelung ein Kennlinienfeld für ein Benzinfluidsystem nutzt. Der Block 61 hat zwei Eingänge 62, 63, ein Eingang 62 ist für die Drehzahl und Eingang 63 ist für den Ansteuerstrom. Ausgangsgröße des Blocks 61 ist ein Druckwert 64. Figure 6 shows a schematic representation of a controlled system. In the exemplary embodiment of a controlled system of the computer program. Block 61 represents a control module that uses a characteristic field for a gasoline fluid system for control purposes. The block 61 has two inputs 62, 63, an input 62 is for the speed and input 63 is for the drive current. The output variable of block 61 is a pressure value 64.

Figur 7 zeigt beispielhaft ein Kennlinienfeld für ein Dieselfluidfördersystem. Hierbei sind ebenso, wie in Figur 5 der Druck über der Drehzahl aufgetragen. Ebenso wie in Figur 5 sind von unten nach oben die einzelnen diagonalen Kennlinien Kurven steigenden Stroms. Figure 7 shows an example of a characteristic field for a diesel fluid delivery system. Here, as in Figure 5 the pressure plotted against the speed. Just like in Figure 5 are the individual diagonal curves of increasing current from bottom to top.

Um eine bessere Einordnung des Kennlinienfelds zu ermöglichen, wird in einer weiteren Ausgestaltung ein zusätzliches Kalibrierventil 14 im Fluidfördersystem 10 verwendet. Das Kalibrierventil 14 erzeugt, wie in Figur 8 dargestellt, einen Knick in den Druckkennlinien 81 bis 84. Hierdurch kann das Kennlinienfeld für den Ansteuerstrom nivelliert werden, da ein Ankerpunkt zur Ausrichtung geschaffen wird.In order to enable a better classification of the characteristic field, an additional calibration valve 14 is used in the fluid delivery system 10 in a further embodiment. The calibration valve 14 generates, as in Figure 8 shown, a kink in the pressure characteristic curves 81 to 84. This allows the characteristic curve field for the control current to be leveled, since an anchor point is created for alignment.

Verschiedene Eckparameter sind nach einer Aufzeichnung jedoch noch nicht definiert. Dies ist in den beiden Graphen von Figur 9 dargestellt. Zwar sind Teilbereiche (OK) der Kennlinienfelder in Figur 9 ordentlich zugeordnet (verankert), jedoch weisen andere Bereiche (X) der beiden in Figur 9 dargestellten Kennlinienfelder Ungenauigkeiten auf.However, various basic parameters have not yet been defined after recording. This is in the two graphs of Figure 9 shown. Partial areas (OK) of the characteristic curve fields are in Figure 9 neatly assigned (anchored), but other areas (X) of the two in Figure 9 Characteristic fields shown inaccuracies.

Figur 10 zeigt eine weitere Darstellung für ein Kennlinienfeld für Diesel. Hier sind ebenfalls wichtige Ankerpunkte nicht definiert. Durch die übliche Verwendung einer Verdrängerpumpe kann beispielsweise auch eine Nullfördermenge nicht zur Nivellierung verwendet werden, da die Art und Weise, mit der eine Verdrängerpumpe fördert, eine Nullfördermenge erlaubt. Figure 10 shows a further representation for a characteristic field for diesel. Important anchor points are also not defined here. Through the usual use of a positive displacement pump For example, even a zero delivery rate cannot be used for leveling, since the way in which a positive displacement pump delivers allows a zero delivery rate.

Um weitere Parameterwerte für die Nivellierung des Kennlinienfelds zu erlangen, wird ein spezielles Kalibrierventil 14 eingesetzt. Hierbei ist in unterschiedlichen Ausgestaltungen eine verschiedene Anzahl und verschiedene Ausgestaltungen von Ventilen denkbar.In order to obtain further parameter values for leveling the characteristic field, a special calibration valve 14 is used. A different number and different configurations of valves are conceivable in different configurations.

In einer Ausgestaltung wird ein limitiertes Ventil, wie in Figur 11 schematisch dargestellt, eingesetzt. Das limitierte Ventil lässt, nachdem es einmal geöffnet ist, nur eine definierte Menge (Bypassmenge) abfließen. Beispielsweise öffnet das limitierte Ventil bei 3 bar und erlaubt dann einen konstanten Abfluss von 5 1/Std. Hierbei führt ein druckabhängiger Einlass 112 auf einen Widerstand (Ventilklappe), der schematisch durch eine Feder 110 dargestellt ist. Ist der Druck groß genug, so wird der Auslass 111 freigegeben und das Fluid kann abfließen.In one embodiment, a limited valve, as shown schematically in FIG. 11, is used. Once opened, the limited valve only allows a defined amount (bypass amount) to drain. For example, the limited valve opens at 3 bar and then allows a constant flow of 5 l / h. Here, a pressure-dependent inlet 112 leads to a resistor (valve flap), which is represented schematically by a spring 110. If the pressure is high enough, the outlet 111 is opened and the fluid can flow away.

Figur 12 zeigt eine schematische Darstellung eines Kalibrierventils 14 gemäß einer weiteren Ausgestaltung. Hierbei ist das Kalibrierventil 14 ein Stufenventil. Das Stufenventil ermöglicht es, bei unterschiedlichen Druckstufen unterschiedliche Bypassmengen des Fluids abfließen zu lassen. Beispielsweise werden hier bei 3 bar 5 1/Std. und ab 4 bar 10 l/Std. abgeleitet. Hierbei führt ein druckabhängiger Einlass 121 auf einen Widerstand (Ventilklappe), der schematisch durch eine Feder 120 dargestellt ist. Ist der Druck groß genug, so wird der Auslass 121 freigegeben und das Fluid kann abfließen. Steigt der Druck weiter, wird zusätzlich der Auslass 122 freigegeben, so dass die Abflussmenge steigt. Selbstverständlich sind unterschiedliche Anzahlen von Stufen mit unterschiedlichen Werten und Auslassdrücken denkbar. Wichtig hierbei ist, dass die aufgenommenen Druckkennlinien der Fluidpumpe 13 unterschiedliche Knickstufen aufweisen. Anhand dieser kann das Kennlinienfeld der Ansteuerstromkurven nivelliert werden. Figure 12 shows a schematic representation of a calibration valve 14 according to a further embodiment. Here, the calibration valve 14 is a step valve. The step valve enables different bypass quantities of the fluid to flow off at different pressure levels. For example, 5 1 / h at 3 bar. and from 4 bar 10 l / h derived. Here, a pressure-dependent inlet 121 leads to a resistance (valve flap), which is represented schematically by a spring 120. If the pressure is high enough, the outlet 121 is opened and the fluid can flow away. If the pressure continues to rise, the outlet 122 is additionally opened, so that the discharge quantity increases. Of course, different numbers of stages with different values and outlet pressures are conceivable. It is important here that the recorded pressure characteristics of the fluid pump 13 have different buckling levels exhibit. The characteristic field of the control current curves can be leveled using this.

Eine weitere Ausgestaltung des Kalibrierventils 14 ist ein Stufenventil, das einen Abfluss nur innerhalb eines bestimmten Druckbereichs zulässt. Figur 13 zeigt eine schematische Darstellung eines derartigen Ventils. Das Ventil ist bei 1 bar geschlossen, bei 2 bar geöffnet und schließt wieder bei 3 bar komplett. Zwischen 2, 3 bar wird eine konstante Menge von 5 1/Std. abgelassen. Hierbei führt eine Druckkopplung 131 auf einen Widerstand, der schematisch durch eine Feder 130 dargestellt ist. Ist der Druck groß genug, so wird der Bypassvolumeneingang 132 freigegeben und das Fluid kann über den ebenfalls freigegebenen Bypassvolumenausgang 133 abfließen. Steigt der Druck weiter, so sperrt das Ventil.A further embodiment of the calibration valve 14 is a step valve that only allows an outflow within a certain pressure range. Figure 13 shows a schematic representation of such a valve. The valve is closed at 1 bar, opened at 2 bar and closes again completely at 3 bar. Between 2.3 bar, a constant amount of 5 1 / hour. drained. Here, a pressure coupling 131 leads to a resistor, which is represented schematically by a spring 130. If the pressure is high enough, the bypass volume inlet 132 is released and the fluid can flow off via the bypass volume outlet 133, which is also released. If the pressure continues to rise, the valve closes.

Figur 14 zeigt verschiedene Pumpenkennlinien. Fett dargestellt sind Druckkennlinien des Fluidfördersystems 10. (Abszissenachse: Drehzahl; Ordinatenachse: Druck und Ansteuerstrom). Hierbei ist ersichtlich, dass die in Fett dargestellten Druckkennlinien unterschiedliche Knicke aufweisen. Anhand dieser Knicke lässt sich nun das Kennlinienfeld des Ansteuerstroms (dünne Linien) nivellieren. Die Messung kann drehzahlgesteuert durchgeführt werden. Das heißt, die Drehzahl wird durch die Ansteuerung des elektrischen Motors 11 abgefahren. Dies kann beispielsweise beim Einschalten der Fluidpumpe 13 vorgenommen werden. Figure 14 shows different pump characteristics. Pressure characteristics of the fluid delivery system 10 are shown in bold (abscissa axis: speed; ordinate axis: pressure and control current). It can be seen here that the pressure characteristics shown in bold have different kinks. The characteristic field of the control current (thin lines) can now be leveled on the basis of these kinks. The measurement can be speed controlled. That is, the speed is reduced by the control of the electric motor 11. This can be done, for example, when the fluid pump 13 is switched on.

Figur 15 zeigt ähnlich wie Figur 14 verschiedene Charakteristika, jedoch für verschiedene Ventiltypen (Abszissenachse: Drehzahl; Ordinatenachse: Druck und Ansteuerstrom). Die durch das modifizierte Ventil vorhandenen zusätzlichen Charakteristika ermöglichen eine einwandfreie Kalibrierung während eines Betriebs des Fluidfördersystems unter verschiedenen realistischen Bedingungen. Figure 15 shows similar to Figure 14 Different characteristics, but for different valve types (axis of abscissa: speed; axis of ordinate: pressure and control current). The additional characteristics provided by the modified valve enable flawless calibration during operation of the fluid delivery system under various realistic conditions.

Hierbei kann etwas unterhalb des erwarteten Arbeitspunkts die Stromregelung eingeschaltet werden und der Ansteuerstrom leicht erhöht werden. Sobald ein Drehzahlsprung eintritt, ist davon auszugehen, dass ein Kalibrierventil öffnet und das Kennlinienfeld kann an diesem Ankerpunkt ausgerichtet werden. Dieser Ansteuerstrom kann zur Nivellierung des Kennlinienfelds verwendet werden. Im weiteren Arbeitsbetrieb kann wiederum drehzahlgeführt weitergearbeitet werden. Ein derartiges Nivellieren ist zu jedem Zeitpunkt anwendbar, auch und vor allem während des laufenden Betriebs. Eine derartige Bypassfunktion wirkt sich nicht auf den betrieb aus und beeinflusst nicht das Kennlinienfeld des Ansteuerstroms (vergleiche Figur 10). Das Kennlinienfeld bleibt auch mit Einsatz des Bypassventils oder Stufenventils (im Allgemeinen des Kalibrierventils 14) identisch.The current control can be switched on slightly below the expected operating point and the control current can be increased slightly. As soon as a speed jump occurs, it can be assumed that a calibration valve opens and the characteristic field can be aligned at this anchor point. This control current can be used to level the characteristic field. In the further work operation, speed-controlled work can be continued. Such a leveling can be used at any time, also and especially during operation. Such a bypass function has no effect on operation and does not influence the characteristic field of the control current (compare Figure 10 ). The characteristic field remains identical even when using the bypass valve or stepped valve (generally the calibration valve 14).

Claims (11)

  1. Method for producing a set of characteristic curves of a fluid pump (13) of a pressure-dependent fluid conveying system (10) for an operating range of the fluid pump (13), the fluid conveying system (10) comprising:
    - a current-controlled electric motor (11) which is controlled by a motor control unit (12) by way of an actuating current and drives the fluid pump (13);
    comprising the steps:
    - setting of the actuating current to a predefined value;
    - changing of a throughflow volume of the fluid conveying system (10) after the actuating current is set;
    - recording of a dataset which describes a pressure in the fluid conveying system (10) in a manner which is dependent on the change of the throughflow volume;
    - repeating of the steps of setting, changing and recording for a predefined number of repetitions and predefined various actuating currents; and
    - producing of a set of characteristic curves from the recorded dataset.
  2. Method according to Claim 1, the following step additionally being carried out:
    - determining of boundary ranges and/or boundary points of the set of characteristic curves based on parameters which characterize the fluid conveying system (10).
  3. Method according to Claim 1 or 2, the following step additionally being carried out:
    - calibrating of the set of characteristic curves by way of at least one characteristic curve of an actuating current being moved along in at least one part region of the characteristic curve.
  4. Method according to Claim 2, the parameters which characterise the fluid conveying system (10) comprising at least one of the following parameters:
    - zero conveying quantity of the fluid pump (13);
    - maximum rotational speed of the electric motor (11);
    - maximum conveying volume of the fluid pump (13);
    - minimum operating current of the electric motor (11).
  5. Method according to one of Claims 1 to 4, the fluid conveying system comprising, furthermore, a calibrating valve (14) which is arranged on an outlet side of the fluid pump (13) and opens in a manner which is dependent on a predefined pressure, in order to provide a pressure-dependent calibrating function, and the step of recording being additionally dependent on that of the calibrating function.
  6. Method according to Claim 5, the calibrating valve (14) being configured as one of the following valve types:
    - threshold pressure valve;
    - limited valve;
    - stage valve.
  7. Method according to Claim 6, the calibrating valve (14) being configured to derive a predefined maximum volumetric flow from the fluid conveying system (10) if the calibrating valve (14) is configured as a limited valve, or being configured to derive a predefined maximum volumetric flow from the fluid conveying system (10) per stage if the calibrating valve (14) is configured as a stage valve.
  8. Method according to one of Claims 1 to 7, the step of setting of the actuating current and changing of a throughflow volume taking place subsequently to switching on of the fluid pump (13) while the fluid pump (13) is being started up.
  9. Use of a limited valve as a calibrating valve (14) in a fluid conveying system (10) which is set up to carry out a method according to one of Claims 1 to 4.
  10. Use of a stage valve as a calibrating valve (14) in a fluid conveying system (10) which is set up to carry out a method according to either of Claims 1 and 2.
  11. Control unit for a fluid conveying system (10), the fluid conveying system (10) comprising:
    - a current-controlled electric motor (11) which is regulated by a motor control unit (12);
    - a fluid pump (13) which is controlled by the electric motor (11);
    the control unit being set up to carry out a method according to one of Claims 1 to 4.
EP15788053.5A 2014-11-03 2015-11-02 Method for producing a set of characteristic curves of a fluid pump, use of a limited valve, use of a staging valve, and control device for a fluid conveying system Active EP3215744B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014222390.3A DE102014222390A1 (en) 2014-11-03 2014-11-03 Method for creating a characteristic field of a fluid pump, use of a limited valve, use of a stepped valve and control unit for a fluid delivery system
PCT/EP2015/075473 WO2016071285A1 (en) 2014-11-03 2015-11-02 Method for producing a set of characteristic curves of a fluid pump, use of a limited valve, use of a staging valve, and control device for a fluid conveying system

Publications (2)

Publication Number Publication Date
EP3215744A1 EP3215744A1 (en) 2017-09-13
EP3215744B1 true EP3215744B1 (en) 2020-05-13

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EP15788053.5A Active EP3215744B1 (en) 2014-11-03 2015-11-02 Method for producing a set of characteristic curves of a fluid pump, use of a limited valve, use of a staging valve, and control device for a fluid conveying system

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EP (1) EP3215744B1 (en)
DE (1) DE102014222390A1 (en)
WO (1) WO2016071285A1 (en)

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US10859592B2 (en) * 2017-01-31 2020-12-08 Tecan Trading Ag Method of aspirating by pipetting and pipetting apparatus
DE102017221333B4 (en) 2017-11-28 2021-01-28 Vitesco Technologies GmbH Tolerance and wear compensation of a fuel pump
DE102017221342B4 (en) * 2017-11-28 2021-01-28 Vitesco Technologies GmbH Tolerance and wear compensation of a fuel pump
CN112032035B (en) * 2020-08-13 2022-06-07 四川虹美智能科技有限公司 Method for determining damage of valve plate, compressor and electronic equipment

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DE3402120A1 (en) * 1984-01-23 1985-07-25 Rheinhütte vorm. Ludwig Beck GmbH & Co, 6200 Wiesbaden METHOD AND DEVICE FOR CONTROLLING DIFFERENT OPERATING PARAMETERS FOR PUMPS AND COMPRESSORS
DE3824057A1 (en) * 1988-07-15 1990-01-25 Loewe Pumpenfabrik Gmbh Method for regulating the operation of pumps
DE4243118A1 (en) * 1992-12-21 1994-06-23 Continental Ag Maintaining constant press. in hydraulic system
DE10257657A1 (en) * 2001-12-21 2003-07-03 Ksb Ag Hydraulic system
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DE102009050083B4 (en) * 2009-10-20 2016-08-18 Viessmann Werke Gmbh & Co Kg Method for determining a volume flow in a closed flow system provided with a turbomachine and with a control unit
DE102011015154B4 (en) * 2011-03-25 2017-01-12 Continental Automotive Gmbh Method for monitoring an electric motor-driven fuel pump and fuel delivery unit with a fuel pump
ES2541584T3 (en) * 2012-09-07 2015-07-21 Gidelmar, S.A. Method and control equipment of a multi-point liquid distribution system
US9528519B2 (en) * 2012-10-12 2016-12-27 Continental Automotive Systems, Inc. Pressure control by phase current and initial adjustment at car line

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WO2016071285A1 (en) 2016-05-12
DE102014222390A1 (en) 2016-05-04

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