EP4088333A1 - Method for operating a fuel cell system - Google Patents

Method for operating a fuel cell system

Info

Publication number
EP4088333A1
EP4088333A1 EP20824469.9A EP20824469A EP4088333A1 EP 4088333 A1 EP4088333 A1 EP 4088333A1 EP 20824469 A EP20824469 A EP 20824469A EP 4088333 A1 EP4088333 A1 EP 4088333A1
Authority
EP
European Patent Office
Prior art keywords
air compressor
electric motor
driven air
fuel cell
map
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20824469.9A
Other languages
German (de)
French (fr)
Inventor
Jochen Wessner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4088333A1 publication Critical patent/EP4088333A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04395—Pressure; Ambient pressure; Flow of cathode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04425—Pressure; Ambient pressure; Flow at auxiliary devices, e.g. reformers, compressors, burners
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04597—Current of auxiliary devices, e.g. batteries, capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04865—Voltage
    • H01M8/04888—Voltage of auxiliary devices, e.g. batteries, capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to a method for operating a fuel cell system with a fuel cell to which compressed air is supplied via an electric motor-driven air compressor, the working range of which can be represented in a characteristic diagram that has a surge limit and a stuffing limit and is stored in a controller of the electric motor-driven air compressor.
  • the invention also relates to such a fuel cell system.
  • the object of the invention is to simplify the operation of a fuel cell system.
  • the task is in a method for operating a fuel cell system with a fuel cell, which has a Electrically driven air compressor is supplied with compressed air, the working range of which can be represented in a map that has a surge limit and a stuffing limit and is stored in a controller of the electromotive driven air compressor, achieved in that at least one electrical current signal is detected and during operation of the electric motor driven air compressor is compared with a pre-pump limit value stored in the characteristic map, the electric motor-driven air compressor being controlled in such a way that a surge limit value also stored in the characteristic field is not reached during operation of the electric motor-driven air compressor.
  • the air compressor can also be referred to as a compressor.
  • anticipatory measures are taken to avoid reaching the surge limit when the electric motor-driven air compressor is in operation. This can significantly increase the service life of the fuel cell system.
  • the electrical current signal with which the electric motor-driven air compressor is controlled is specifically changed so that the surge limit is not reached when the air compressor is in operation.
  • a preferred exemplary embodiment of the method is characterized in that a pressure ratio is plotted against a current ratio with operating points of the electric motor-driven air compressor in the stored characteristics map.
  • the characteristic map is advantageously created in tests with the fuel cell system before the fuel cell system with the electric motor-driven air compressor is used in series operation. The control and regulation effort in the operation of the fuel cell system can be effectively reduced by the map.
  • Another preferred exemplary embodiment of the method is characterized in that a pre-pumping limit curve is spaced apart from the surge limit by a safety margin.
  • a pre-pumping limit curve is spaced apart from the surge limit by a safety margin.
  • Another preferred exemplary embodiment of the method is characterized in that the electrical current signal is changed in order to adapt the operating point of the electric motor-driven air compressor relative to the surge limit. It is possible here to proceed iteratively or step-by-step in order to prevent the surge limit from being reached without major losses in efficiency.
  • the electric motor-driven air compressor comprises a permanently excited synchronous machine.
  • the permanently excited synchronous machine is advantageously controlled with different electrical currents, current signals or different frequencies in order to prevent the surge limit from being reached when the electric motor-driven air compressor is in operation.
  • the above-mentioned task is an alternative or additionally solved in that the map includes a prepump limit curve which depends on a current ratio and on a pressure ratio of an electric motor drive of the air compressor. Reaching the surge limit during operation of the fuel cell system can thus be reliably prevented in a simple manner.
  • a preferred exemplary embodiment of the fuel cell system is characterized in that the electric motor drive of the air compressor comprises a permanently excited synchronous machine which is controlled at different frequencies as a function of a position of an operating point in the map. Reaching the surge limit during operation of the electric motor-driven air compressor can thus be prevented without a great deal of control or regulation effort.
  • the invention further relates to a computer program product with a computer program which has software means for performing a method described above when the computer program is executed on a computer.
  • the computer is, for example, a control for the electric motor drive of the air compressor in the fuel cell system.
  • a pressure ratio is plotted against a current ratio with operating points of the electric motor-driven air compressor and with a pre-pumping limit curve in the map.
  • FIG. 1 shows a schematic representation of a fuel cell system with a fuel cell and an air compressor driven by an electric motor and with a pressure sensor device;
  • FIG. 2 shows a similar fuel cell system as in FIG. 1 without the pressure sensor device, but with a measuring device for measuring an air mass flow supplied to the fuel cell;
  • FIG. 3 shows a characteristic diagram with a surge limit, a stuffing limit and a prepump limit, which is stored in a control of the fuel cell system from FIGS. 1 and 2;
  • FIG. 4 shows a Cartesian coordinate diagram in which the course of an electrical current signal is plotted over time
  • FIG. 5 shows a representation similar to that in FIG. 4 with a modified current signal.
  • a fuel cell system 1 with a fuel cell 2 and an electric motor-driven air compressor 3 is shown schematically.
  • the same reference symbols are used to designate the same or similar parts.
  • the fuel cell system 1 is constructed in the same way or similar to the fuel cell system disclosed in the American patent US Pat. No. 7,771,883 B2 recognized at the outset.
  • An arrow 4 in FIGS. 1 and 2 indicates air which is supplied to the air compressor 3 via an air filter 5.
  • the air compressor 5 is driven by an electric motor drive 6.
  • the electromotive drive 6 is designed as a permanently excited synchronous machine 8 with a controller 7.
  • a valve device 9 is arranged at the air outlet of the fuel cell 2.
  • the features described above are in the case of FIGS. 1 and 2 fuel cell system 1 shown executed the same. In the following, the differences between the fuel cell system 1 shown in FIGS. 1 and 2 will be discussed.
  • the fuel cell system 1 shown in FIG. 1 comprises a pressure sensor device 10 with which the pressure of the compressed air that is supplied to the fuel cell 2 by the air compressor 3 is detected.
  • An arrow 11 indicates that the controller 7 of the electromotive drive 6 is connected to the pressure sensor device 10 in terms of control.
  • An arrow 12 indicates that the controller 7 is connected to the valve device 9 in terms of control.
  • a measuring device 14 is provided with which an air mass flow between the air filter 5 and the air compressor 3 is detected.
  • An arrow 15 in FIG. 2 indicates that the controller 7 of the electromotive drive 6 is connected to the measuring device 14 in terms of control.
  • FIG. 3 a map 20 for operating the electric motor-driven air compressor (3 in FIGS. 1 and 2) is shown in a Cartesian coordinate diagram.
  • a current ratio I to I max is plotted on an x-axis 21.
  • a pressure ratio p to p max is plotted on a y-axis 22.
  • the characteristics map 20 includes a surge limit 26 and a stuffing limit 28.
  • the characteristics map 20 includes a prepump limit curve 27. The prepump limit curve 27 is spaced from the surge limit 26.
  • FIGS. 4 and 5 two further Cartesian coordinate diagrams are shown.
  • a time in a suitable time unit is plotted on an x-axis 31.
  • a frequency of a current signal per unit of time is plotted on a y-axis 32.
  • the two diagrams show courses of two current signals 33, 34 with different frequencies.
  • Operation of the air compressor 3, which is also referred to as a compressor, in the vicinity of the surge line 26 should be avoided.
  • the control of the permanently excited synchronous machine 8, which represents the electric motor drive 6 of the air compressor 3, takes place by means of a regulated rotating field for the electric current, as indicated in FIGS. 4 and 5.
  • the electrical current and the permanent magnets of the permanently excited synchronous machine 8 then result in a mechanical moment for compressing the sucked in air 4.
  • Operating points 23 to 25 of the air compressor 3 are determined from pressure and temperature or directly from the measured air mass flow of the air compressor 3, as well as the known frequency of the current signal 33, 34. The respective operating point, for example 24, is then compared with the characteristics map 20 stored in the controller 7.
  • the frequency of the rotating field can be adapted in order to remain within a suitable safety margin from the surge limit 26.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention relates to a method for operating a fuel cell system having a fuel cell, to which air compressed by means of an electromotively driven air compressor is fed, the working range of which electromotively driven air compressor can be represented in a characteristic map (20) which has a surge limit (20) and a choke limit (28) and which is stored in a controller of the electromotively driven air compressor. In order to lengthen the service life of the fuel cell system, at least one flow signal is acquired during the operation of the electromotively driven air compressor and is compared with a pre-surge threshold value (29) stored in the characteristic map (20), wherein the electromotively driven air compressor is controlled in targeted fashion such that a surge threshold value likewise stored in the characteristic map (20) is not reached during the operation of the electromotively driven air compressor.

Description

Beschreibung description
Titel title
Verfahren zum Betreiben eines Brennstoffzellensystems Method for operating a fuel cell system
Die Erfindung betrifft ein Verfahren zum Betreiben eines Brennstoffzellensystems mit einer Brennstoffzelle, der über einen elektromotorisch angetriebenen Luftverdichter verdichtete Luft zugeführt wird, dessen Arbeitsbereich in einem Kennfeld darstellbar ist, das eine Pumpgrenze und eine Stopfgrenze aufweist und in einer Steuerung des elektromotorisch angetriebenen Luftverdichters hinterlegt ist. Die Erfindung betrifft des Weiteren ein derartiges Brennstoffzellensystem. The invention relates to a method for operating a fuel cell system with a fuel cell to which compressed air is supplied via an electric motor-driven air compressor, the working range of which can be represented in a characteristic diagram that has a surge limit and a stuffing limit and is stored in a controller of the electric motor-driven air compressor. The invention also relates to such a fuel cell system.
Stand der Technik State of the art
Aus dem amerikanischen Patent US 7,771,883 B2 ist ein Brennstoffzellensystem mit einem Kompressor bekannt, der einen Ladeluftstrom erzeugt, wobei in einer Steuerung des Motors ein Kompressorkennfeld des Kompressors gespeichert ist, wobei die Steuerung einen Auslassdruck und die Temperatur des Kompressors bestimmt, wobei aus der Drehzahl des Kompressors und einem Luftstromsignal von einem Massendurchflussmesser ein Ort auf dem Kompressorkennfeld bestimmt wird, an dem das System arbeitet, um zu verhindern, dass der Kompressor in einen Pumpzustand übergeht. From the American patent US Pat. No. 7,771,883 B2 a fuel cell system with a compressor is known which generates a charge air flow, a compressor map of the compressor being stored in a controller of the motor, the controller determining an outlet pressure and the temperature of the compressor Compressor and an air flow signal from a mass flow meter, a location on the compressor map is determined where the system is operating to prevent the compressor from going into a surge condition.
Offenbarung der Erfindung Disclosure of the invention
Aufgabe der Erfindung ist es, das Betreiben eines Brennstoffzellensystems zu vereinfachen. The object of the invention is to simplify the operation of a fuel cell system.
Die Aufgabe ist bei einem Verfahren zum Betreiben eines Brennstoffzellensystems mit einer Brennstoffzelle, der über einen elektromotorisch angetriebenen Luftverdichter verdichtete Luft zugeführt wird, dessen Arbeitsbereich in einem Kennfeld darstellbar ist, das eine Pumpgrenze und eine Stopfgrenze aufweist und in einer Steuerung des elektromotorisch angetriebenen Luftverdichters hinterlegt ist, dadurch gelöst, dass mindestens ein elektrisches Stromsignal im Betrieb des elektromotorisch angetriebenen Luftverdichters erfasst und mit einem in dem Kennfeld hinterlegten Vorpumpgrenzwert verglichen wird, wobei der elektromotorisch angetriebene Luftverdichter gezielt so angesteuert wird, dass ein ebenfalls in dem Kennfeld hinterlegter Pumpgrenzwert im Betrieb des elektromotorisch angetriebenen Luftverdichters nicht erreicht wird. Der Luftverdichter kann auch als Kompressor bezeichnet werden. In dem beanspruchten Verfahren werden vorausschauend Maßnahmen ergriffen, um das Erreichen der Pumpgrenze im Betrieb des elektromotorisch angetriebenen Luftverdichters zu vermeiden. Dadurch kann die Lebensdauer des Brennstoffzellensystems signifikant erhöht werden. Dabei wird das elektrische Stromsignal, mit dem der elektromotorisch angetriebene Luftverdichter angesteuert wird, gezielt so verändert, dass die Pumpgrenze im Betrieb des Luftverdichters nicht erreicht wird. The task is in a method for operating a fuel cell system with a fuel cell, which has a Electrically driven air compressor is supplied with compressed air, the working range of which can be represented in a map that has a surge limit and a stuffing limit and is stored in a controller of the electromotive driven air compressor, achieved in that at least one electrical current signal is detected and during operation of the electric motor driven air compressor is compared with a pre-pump limit value stored in the characteristic map, the electric motor-driven air compressor being controlled in such a way that a surge limit value also stored in the characteristic field is not reached during operation of the electric motor-driven air compressor. The air compressor can also be referred to as a compressor. In the claimed method, anticipatory measures are taken to avoid reaching the surge limit when the electric motor-driven air compressor is in operation. This can significantly increase the service life of the fuel cell system. The electrical current signal with which the electric motor-driven air compressor is controlled is specifically changed so that the surge limit is not reached when the air compressor is in operation.
Ein bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass in dem hinterlegten Kennfeld ein Druckverhältnis über einem Stromverhältnis mit Betriebspunkten des elektromotorisch angetriebenen Luftverdichters aufgetragen ist. Das Kennfeld wird vorteilhaft in Versuchen mit dem Brennstoffzellensystem erstellt, bevor das Brennstoffzellensystem mit dem elektromotorisch angetriebenen Luftverdichter in einem Serienbetrieb eingesetzt wird. Durch das Kennfeld kann der Steuerungs- und Regelungsaufwand im Betrieb des Brennstoffzellensystems wirksam reduziert werden. A preferred exemplary embodiment of the method is characterized in that a pressure ratio is plotted against a current ratio with operating points of the electric motor-driven air compressor in the stored characteristics map. The characteristic map is advantageously created in tests with the fuel cell system before the fuel cell system with the electric motor-driven air compressor is used in series operation. The control and regulation effort in the operation of the fuel cell system can be effectively reduced by the map.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass eine Vorpumpgrenzkurve um einen Sicherheitsabstandsbereich von der Pumpgrenze beabstandet ist. Über eine geeignete Auswahl der Größe des Sicherheitsabstandsbereichs kann mit relativ geringem Aufwand erreicht werden, dass die Vorpumpgrenze im Betrieb des elektromotorisch angetriebenen Luftverdichters nie oder so gut wie nie erreicht wird. Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass das Kennfeld verwendet wird, um eine Position eines Betriebspunktes des elektromotorisch angetriebenen Luftverdichters relativ zu der Pumpgrenze des elektromotorisch angetriebenen Luftverdichters zu bestimmen. Dann kann mit geringem Aufwand durch einen einfachen Vergleich ermittelt werden, ob die vorab beschriebenen vorausschauenden Maßnahmen ergriffen werden müssen. Another preferred exemplary embodiment of the method is characterized in that a pre-pumping limit curve is spaced apart from the surge limit by a safety margin. By means of a suitable selection of the size of the safety distance range, it can be achieved with relatively little effort that the pre-pumping limit is never or almost never reached when the electric motor-driven air compressor is in operation. Another preferred exemplary embodiment of the method is characterized in that the characteristics map is used to determine a position of an operating point of the electric motor-driven air compressor relative to the surge limit of the electric motor-driven air compressor. A simple comparison can then be used to determine with little effort whether the anticipatory measures described above need to be taken.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass das elektrische Stromsignal verändert wird, um den Betriebspunkt des elektromotorisch angetriebenen Luftverdichters relativ zu der Pumpgrenze anzupassen. Hier kann gegebenenfalls iterativ beziehungsweise schrittweise vorgegangen werden, um das Erreichen der Pumpgrenze ohne größere Wirkungsgradverluste zu verhindern. Another preferred exemplary embodiment of the method is characterized in that the electrical current signal is changed in order to adapt the operating point of the electric motor-driven air compressor relative to the surge limit. It is possible here to proceed iteratively or step-by-step in order to prevent the surge limit from being reached without major losses in efficiency.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass der elektromotorisch angetriebene Luftverdichter eine permanent erregte Synchronmaschine umfasst. Die permanent erregte Synchronmaschine wird vorteilhaft mit unterschiedlichen elektrischen Strömen, Stromsignalen beziehungsweise unterschiedlichen Frequenzen angesteuert, um das Erreichen der Pumpgrenze im Betrieb des elektromotorisch angetriebenen Luftverdichters zu verhindern. Another preferred exemplary embodiment of the method is characterized in that the electric motor-driven air compressor comprises a permanently excited synchronous machine. The permanently excited synchronous machine is advantageously controlled with different electrical currents, current signals or different frequencies in order to prevent the surge limit from being reached when the electric motor-driven air compressor is in operation.
Bei einem Brennstoffzellensystem mit einer Brennstoffzelle, der über einen elektromotorisch angetriebenen Luftverdichter verdichtete Luft zugeführt wird, dessen Arbeitsbereich in einem Kennfeld darstellbar ist, das eine Pumpgrenze und eine Stopfgrenze aufweist und in einer Steuerung des elektromotorisch angetriebenen Luftverdichters hinterlegt ist, ist die oben angegebene Aufgabe alternativ oder zusätzlich dadurch gelöst, dass das Kennfeld eine Vorpumpgrenzkurve umfasst, die von einem Stromverhältnis und von einem Druckverhältnis eines elektromotorischen Antriebs des Luftverdichters abhängt. So kann das Erreichen der Pumpgrenze im Betrieb des Brennstoffzellensystems auf einfache Art und Weise sicher verhindert werden. Ein bevorzugtes Ausführungsbeispiel des Brennstoffzellensystems ist dadurch gekennzeichnet, dass der elektromotorische Antrieb des Luftverdichters eine permanent erregte Synchronmaschine umfasst, die in Abhängigkeit von einer Position eines Betriebspunktes in dem Kennfeld mit unterschiedlichen Frequenzen angesteuert wird. So kann ohne großen steuerungstechnischen beziehungsweise regelungstechnischen Aufwand das Erreichen der Pumpgrenze im Betrieb des elektromotorisch angetriebenen Luftverdichters verhindert werden. In the case of a fuel cell system with a fuel cell that is supplied with compressed air via an electric motor-driven air compressor, the working range of which can be represented in a characteristic diagram that has a surge limit and a stuffing limit and is stored in a controller of the electric motor-driven air compressor, the above-mentioned task is an alternative or additionally solved in that the map includes a prepump limit curve which depends on a current ratio and on a pressure ratio of an electric motor drive of the air compressor. Reaching the surge limit during operation of the fuel cell system can thus be reliably prevented in a simple manner. A preferred exemplary embodiment of the fuel cell system is characterized in that the electric motor drive of the air compressor comprises a permanently excited synchronous machine which is controlled at different frequencies as a function of a position of an operating point in the map. Reaching the surge limit during operation of the electric motor-driven air compressor can thus be prevented without a great deal of control or regulation effort.
Die Erfindung betrifft des Weiteren ein Computerprogrammprodukt mit einem Computerprogramm, das Softwaremittel zum Durchführen eines vorab beschriebenen Verfahrens aufweist, wenn das Computerprogramm auf einem Computer ausgeführt wird. Bei dem Computer handelt es sich zum Beispiel um eine Steuerung für den elektromotorischen Antrieb des Luftverdichters in dem Brennstoffzellensystem. The invention further relates to a computer program product with a computer program which has software means for performing a method described above when the computer program is executed on a computer. The computer is, for example, a control for the electric motor drive of the air compressor in the fuel cell system.
Bei einem Kennfeld für ein Brennstoffzellensystem mit einer Brennstoffzelle, der über einen elektromotorisch angetriebenen Luftverdichter verdichtete Luft zugeführt wird, dessen Arbeitsbereich in dem Kennfeld darstellbar ist, das eine Pumpgrenze und eine Stopfgrenze aufweist und in einer Steuerung des elektromotorisch angetriebenen Luftverdichters hinterlegt ist, ist die oben angegebene Aufgabe alternativ oder zusätzlich dadurch gelöst, dass in dem Kennfeld ein Druckverhältnis über einem Stromverhältnis mit Betriebspunkten des elektromotorisch angetriebenen Luftverdichters und mit einer Vorpumpgrenzkurve aufgetragen ist. In a map for a fuel cell system with a fuel cell, which is supplied via an electric motor-driven air compressor, the working range of which can be shown in the map that has a surge limit and a stuffing limit and is stored in a controller of the electric motor-driven air compressor, the above is The specified object is alternatively or additionally achieved in that a pressure ratio is plotted against a current ratio with operating points of the electric motor-driven air compressor and with a pre-pumping limit curve in the map.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele im Einzelnen beschrieben sind. Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are described in detail with reference to the drawing.
Kurze Beschreibung der Zeichnung Brief description of the drawing
Es zeigen: Figur 1 eine schematische Darstellung eines Brennstoffzellensystems mit einer Brennstoffzelle und einem elektromotorisch angetriebenen Luftverdichter und mit einer Drucksensoreinrichtung; Show it: FIG. 1 shows a schematic representation of a fuel cell system with a fuel cell and an air compressor driven by an electric motor and with a pressure sensor device;
Figur 2 ein ähnliches Brennstoffzellensystem wie in Figur 1 ohne die Drucksensoreinrichtung, aber mit einer Messeinrichtung zur Messung eines der Brennstoffzelle zugeführten Luftmassenstroms; FIG. 2 shows a similar fuel cell system as in FIG. 1 without the pressure sensor device, but with a measuring device for measuring an air mass flow supplied to the fuel cell;
Figur 3 ein Kennfeld mit einer Pumpgrenze, einer Stopfgrenze und einer Vorpumpgrenze, das in einer Steuerung des Brennstoffzellensystems aus den Figuren 1 und 2 hinterlegt wird; FIG. 3 shows a characteristic diagram with a surge limit, a stuffing limit and a prepump limit, which is stored in a control of the fuel cell system from FIGS. 1 and 2;
Figur 4 ein kartesisches Koordinatendiagramm, in welchem der Verlauf eines elektrischen Stromsignals über der Zeit aufgetragen ist; und FIG. 4 shows a Cartesian coordinate diagram in which the course of an electrical current signal is plotted over time; and
Figur 5 eine ähnliche Darstellung wie in Figur 4 mit einem veränderten Stromsignal. FIG. 5 shows a representation similar to that in FIG. 4 with a modified current signal.
Beschreibung der Ausführungsbeispiele Description of the exemplary embodiments
In den Figuren 1 und 2 ist schematisch ein Brennstoffzellensystem 1 mit einer Brennstoffzelle 2 und einem elektromotorisch angetriebenen Luftverdichter 3 dargestellt. Zur Bezeichnung gleicher oder ähnlicher Teile werden die gleichen Bezugszeichen verwendet. Das Brennstoffzellensystem 1 ist so oder so ähnlich aufgebaut wie das in dem eingangs gewürdigten amerikanischen Patent US 7,771,883 B2 offenbarte Brennstoffzellensystem. In Figures 1 and 2, a fuel cell system 1 with a fuel cell 2 and an electric motor-driven air compressor 3 is shown schematically. The same reference symbols are used to designate the same or similar parts. The fuel cell system 1 is constructed in the same way or similar to the fuel cell system disclosed in the American patent US Pat. No. 7,771,883 B2 recognized at the outset.
Durch einen Pfeil 4 ist in den Figuren 1 und 2 Luft angedeutet, die dem Luftverdichter 3 über einen Luftfilter 5 zugeführt wird. Der Luftverdichter 5 ist durch einen elektromotorischen Antrieb 6 angetrieben. Der elektromotorische Antrieb 6 ist als permanent erregte Synchronmaschine 8 mit einer Steuerung 7 ausgeführt. An arrow 4 in FIGS. 1 and 2 indicates air which is supplied to the air compressor 3 via an air filter 5. The air compressor 5 is driven by an electric motor drive 6. The electromotive drive 6 is designed as a permanently excited synchronous machine 8 with a controller 7.
Am Luftaustritt der Brennstoffzelle 2 ist eine Ventileinrichtung 9 angeordnet. Die vorab beschriebenen Merkmale sind bei dem in den Figuren 1 und 2 dargestellten Brennstoffzellensystem 1 gleich ausgeführt. Im Folgenden wird auf die Unterschiede zwischen dem in den Figuren 1 und 2 dargestellten Brennstoffzellensystem 1 eingegangen. A valve device 9 is arranged at the air outlet of the fuel cell 2. The features described above are in the case of FIGS. 1 and 2 fuel cell system 1 shown executed the same. In the following, the differences between the fuel cell system 1 shown in FIGS. 1 and 2 will be discussed.
Das in Figur 1 gezeigte Brennstoffzellensystem 1 umfasst eine Drucksensoreinrichtung 10, mit welcher der Druck der verdichteten Luft erfasst wird, die der Brennstoffzelle 2 von dem Luftverdichter 3 zugeführt wird. Durch einen Pfeil 11 ist angedeutet, dass die Steuerung 7 des elektromotorischen Antriebs 6 steuerungsmäßig mit der Drucksensoreinrichtung 10 verbunden ist. Durch einen Pfeil 12 ist angedeutet, dass die Steuerung 7 steuerungsmäßig mit der Ventileinrichtung 9 verbunden ist. The fuel cell system 1 shown in FIG. 1 comprises a pressure sensor device 10 with which the pressure of the compressed air that is supplied to the fuel cell 2 by the air compressor 3 is detected. An arrow 11 indicates that the controller 7 of the electromotive drive 6 is connected to the pressure sensor device 10 in terms of control. An arrow 12 indicates that the controller 7 is connected to the valve device 9 in terms of control.
Bei dem in Figur 2 dargestellten Brennstoffzellensystem 1 ist anstelle der Drucksensoreinrichtung (10 in Figur 1) eine Messeinrichtung 14 vorgesehen, mit welcher ein Luftmassenstrom zwischen dem Luftfilter 5 und dem Luftverdichter 3 erfasst wird. Durch einen Pfeil 15 ist in Figur 2 angedeutet, dass die Steuerung 7 des elektromotorischen Antriebs 6 steuerungsmäßig mit der Messeinrichtung 14 verbunden ist. In the fuel cell system 1 shown in FIG. 2, instead of the pressure sensor device (10 in FIG. 1), a measuring device 14 is provided with which an air mass flow between the air filter 5 and the air compressor 3 is detected. An arrow 15 in FIG. 2 indicates that the controller 7 of the electromotive drive 6 is connected to the measuring device 14 in terms of control.
In Figur 3 ist in einem kartesischen Koordinatendiagramm ein Kennfeld 20 zum Betrieb des elektromotorisch angetriebenen Luftverdichters (3 in den Figuren 1 und 2) dargestellt. Auf einer x-Achse 21 ist ein Stromverhältnis I zu lmax aufgetragen. Auf einer y-Achse 22 ist ein Druckverhältnis p zu pmax aufgetragen. In FIG. 3, a map 20 for operating the electric motor-driven air compressor (3 in FIGS. 1 and 2) is shown in a Cartesian coordinate diagram. A current ratio I to I max is plotted on an x-axis 21. A pressure ratio p to p max is plotted on a y-axis 22.
In dem Kennfeld 20 sind beispielhaft drei Betriebspunkte 23, 24, 25 im Betrieb des Luftverdichters eingezeichnet. Das Kennfeld 20 umfasst eine Pumpgrenze 26 und eine Stopfgrenze 28. Darüber hinaus umfasst das Kennfeld 20 eine Vorpumpgrenzkurve 27. Die Vorpumpgrenzkurve 27 ist von der Pumpgrenze 26 beabstandet. Three operating points 23, 24, 25 during operation of the air compressor are drawn in by way of example in characteristic map 20. The characteristics map 20 includes a surge limit 26 and a stuffing limit 28. In addition, the characteristics map 20 includes a prepump limit curve 27. The prepump limit curve 27 is spaced from the surge limit 26.
In den Figuren 4 und 5 sind zwei weitere kartesische Koordinatendiagramme dargestellt. Auf einer x-Achse 31 ist eine Zeit in einer geeigneten Zeiteinheit aufgetragen. Auf einer y-Achse 32 ist eine Frequenz eines Stromsignals pro Zeiteinheit aufgetragen. In den beiden Diagrammen sind Verläufe von zwei Stromsignalen 33, 34 mit unterschiedlichen Frequenzen dargestellt. Ein Betrieb des Luftverdichters 3, der auch als Kompressor bezeichnet wird, in der Nähe der Pumpgrenze 26 soll vermieden werden. Die Ansteuerung der permanent erregten Synchronmaschine 8, die den elektromotorischen Antrieb 6 des Luftverdichters 3 darstellt, erfolgt mittels eines geregelten Drehfeldes für den elektrischen Strom, wie in den Figuren 4 und 5 angedeutet ist. Der elektrische Strom und die Permanentmagnete der permanent erregten Synchronmaschine 8 ergeben dann ein mechanisches Moment zum Verdichten der angesaugten Luft 4. In FIGS. 4 and 5, two further Cartesian coordinate diagrams are shown. A time in a suitable time unit is plotted on an x-axis 31. A frequency of a current signal per unit of time is plotted on a y-axis 32. The two diagrams show courses of two current signals 33, 34 with different frequencies. Operation of the air compressor 3, which is also referred to as a compressor, in the vicinity of the surge line 26 should be avoided. The control of the permanently excited synchronous machine 8, which represents the electric motor drive 6 of the air compressor 3, takes place by means of a regulated rotating field for the electric current, as indicated in FIGS. 4 and 5. The electrical current and the permanent magnets of the permanently excited synchronous machine 8 then result in a mechanical moment for compressing the sucked in air 4.
Aus Druck und Temperatur oder direkt aus dem gemessenen Luftmassenstrom des Luftverdichters 3, sowie der bekannten Frequenz des Stromsignals 33, 34 werden Betriebspunkte 23 bis 25 des Luftverdichters 3 bestimmt. Der jeweilige Betriebspunkt, zum Beispiel 24, wird dann mit dem in der Steuerung 7 gespeicherten Kennfeld 20 verglichen. Operating points 23 to 25 of the air compressor 3 are determined from pressure and temperature or directly from the measured air mass flow of the air compressor 3, as well as the known frequency of the current signal 33, 34. The respective operating point, for example 24, is then compared with the characteristics map 20 stored in the controller 7.
Falls der Betriebspunkt in der Nähe der Vorpumpgrenzkurve 27 liegt, kann die Frequenz des Drehfelds angepasst werden, um in einem geeigneten Sicherheitsabstand zu der Pumpgrenze 26 zu bleiben. If the operating point is in the vicinity of the prepump limit curve 27, the frequency of the rotating field can be adapted in order to remain within a suitable safety margin from the surge limit 26.

Claims

Ansprüche Expectations
1. Verfahren zum Betreiben eines Brennstoffzellensystems (1) mit einer Brennstoffzelle (2), der über einen elektromotorisch angetriebenen Luftverdichter (3) verdichtete Luft (4) zugeführt wird, dessen Arbeitsbereich in einem Kennfeld (20) darstellbar ist, das eine Pumpgrenze (26) und eine Stopfgrenze (28) aufweist und in einer Steuerung (7) des elektromotorisch angetriebenen Luftverdichters (3) hinterlegt ist, dadurch gekennzeichnet, dass mindestens ein elektrisches Stromsignal (33,34) im Betrieb des elektromotorisch angetriebenen Luftverdichters(3) erfasst und mit einem in dem Kennfeld (20) hinterlegten Vorpumpgrenzwert (29) verglichen wird, wobei der elektromotorisch angetriebene Luftverdichter (3) gezielt so angesteuert wird, dass ein ebenfalls in dem Kennfeld (20) hinterlegter Pumpgrenzwert (30) im Betrieb des elektromotorisch angetriebenen Luftverdichters (3) nicht erreicht wird. 1. A method for operating a fuel cell system (1) with a fuel cell (2) to which compressed air (4) is supplied via an air compressor (3) driven by an electric motor, the working range of which can be represented in a characteristic map (20) which has a surge limit (26 ) and has a stuffing limit (28) and is stored in a controller (7) of the electric motor-driven air compressor (3), characterized in that at least one electrical current signal (33, 34) is detected during operation of the electric motor-driven air compressor (3) and with a forepump limit value (29) stored in the characteristic map (20) is compared, the electric motor-driven air compressor (3) being controlled in such a way that a surge limit value (30) also stored in the characteristic map (20) during operation of the electric motor-driven air compressor (3) ) is not reached.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in dem hinterlegten Kennfeld (20) ein Druckverhältnis über einem Stromverhältnis mit Betriebspunkten (23,24,25) des elektromotorisch angetriebenen Luftverdichters (3) aufgetragen ist. 2. The method according to claim 1, characterized in that in the stored map (20) a pressure ratio is plotted against a current ratio with operating points (23,24,25) of the electric motor-driven air compressor (3).
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass eine Vorpumpgrenzkurve (27) um einen Sicherheitsabstandsbereich von der Pumpgrenze (26) beabstandet ist. 3. The method according to claim 2, characterized in that a pre-pumping limit curve (27) is spaced apart from the surge limit (26) by a safety margin range.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Kennfeld (20) verwendet wird, um eine Position eines Betriebspunktes (24) des elektromotorischen angetriebenen Luftverdichters (3) relativ zu der Pumpgrenze (26) des elektromotorisch angetriebenen Luftverdichters (3) zu bestimmen. 4. The method according to any one of the preceding claims, characterized in that the map (20) is used to determine a position of an operating point (24) of the electric motor-driven air compressor (3) relative to the surge limit (26) of the electric motor-driven air compressor (3) to determine.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das Stromsignal (33,34) verändert wird, um den Betriebspunkt (24) des elektromotorisch angetriebenen Luftverdichters (3) relativ zu der Pumpgrenze (26) anzupassen. 5. The method according to claim 4, characterized in that the current signal (33, 34) is changed in order to adapt the operating point (24) of the electric motor-driven air compressor (3) relative to the surge limit (26).
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der elektromotorisch angetriebene Luftverdichter (3) eine permanent erregte Synchronmaschine (8) umfasst. 6. The method according to any one of the preceding claims, characterized in that the electric motor-driven air compressor (3) comprises a permanently excited synchronous machine (8).
7. Brennstoffzellensystem (1) mit einer Brennstoffzelle (2), der über einen elektromotorisch angetriebenen Luftverdichter(3) verdichtete Luft (4) zugeführt wird, dessen Arbeitsbereich in einem Kennfeld (20) darstellbar ist, das eine Pumpgrenze (26) und eine Stopfgrenze (28) aufweist und in einer Steuerung des elektromotorisch angetriebenen Luftverdichters (3) hinterlegt ist, dadurch gekennzeichnet, dass das Kennfeld (20) eine Vorpumpgrenzkurve (27) umfasst, die von einem Stromverhältnis und von einem Druckverhältnis eines elektromotorischen Antriebs (6) des Luftverdichters (3) abhängt. 7. Fuel cell system (1) with a fuel cell (2), which is supplied via an electric motor-driven air compressor (3) compressed air (4), the working range of which can be represented in a map (20), which has a surge limit (26) and a stuffing limit (28) and is stored in a control of the electric motor-driven air compressor (3), characterized in that the map (20) comprises a pre-pumping limit curve (27) which is determined by a current ratio and a pressure ratio of an electric motor drive (6) of the air compressor (3) depends.
8. Brennstoffzellensystem nach Anspruch 7, dadurch gekennzeichnet, dass der elektromotorische Antrieb (6) des Luftverdichters (3) eine permanent erregte Synchronmaschine (8) umfasst, die in Abhängigkeit von einer Position eines Betriebspunktes (24) in dem Kennfeld (20) mit unterschiedlichen Frequenzen (33,34) angesteuert wird. 8. Fuel cell system according to claim 7, characterized in that the electric motor drive (6) of the air compressor (3) comprises a permanently excited synchronous machine (8) which, depending on a position of an operating point (24) in the map (20) with different Frequencies (33,34) is controlled.
9. Computerprogrammprodukt mit einem Computerprogramm, das Softwaremittel zum Durchführen eines vorab beschriebenen Verfahrens aufweist, wenn das Computerprogramm auf einem Computer ausgeführt wird. 9. Computer program product with a computer program which has software means for performing a method described above when the computer program is executed on a computer.
10. Kennfeld (20) für ein Brennstoffzellensystem (1) mit einer Brennstoffzelle (2), der über einen elektromotorisch angetriebenen Luftverdichter (3) verdichtete Luft (4) zugeführt wird, dessen Arbeitsbereich in dem Kennfeld (20) darstellbar ist, das eine Pumpgrenze (26) und eine Stopfgrenze (29) aufweist und in einer Steuerung (7) des elektromotorisch angetriebenen Luftverdichters (3) hinterlegt ist, dadurch gekennzeichnet, dass in dem Kennfeld (20) ein Druckverhältnis über einem Stromverhältnis mit Betriebspunkten (23,24,25) des elektromotorisch angetriebenen Luftverdichters (3) und mit einer Vorpumpgrenzkurve (27) aufgetragen ist. 10. Map (20) for a fuel cell system (1) with a fuel cell (2), which is supplied via an electric motor-driven air compressor (3) compressed air (4), the working range of which can be shown in the map (20), which is a surge limit (26) and a stuffing limit (29) and is stored in a controller (7) of the electric motor-driven air compressor (3), characterized in that in the map (20) a pressure ratio over a current ratio with operating points (23,24,25 ) of the electric motor-driven air compressor (3) and with a pre-pumping limit curve (27) is applied.
EP20824469.9A 2020-01-10 2020-12-07 Method for operating a fuel cell system Pending EP4088333A1 (en)

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