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EP3325804A1 - Pressure measurement method - Google Patents

Pressure measurement method

Info

Publication number
EP3325804A1
EP3325804A1 EP16710928.9A EP16710928A EP3325804A1 EP 3325804 A1 EP3325804 A1 EP 3325804A1 EP 16710928 A EP16710928 A EP 16710928A EP 3325804 A1 EP3325804 A1 EP 3325804A1
Authority
EP
European Patent Office
Prior art keywords
compressor
electric motor
pressure
motor
control device
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.)
Granted
Application number
EP16710928.9A
Other languages
German (de)
French (fr)
Other versions
EP3325804B1 (en
Inventor
Christopher Zaum
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.)
Continental Reifen Deutschland GmbH
Original Assignee
Continental Reifen Deutschland 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 Continental Reifen Deutschland GmbH filed Critical Continental Reifen Deutschland GmbH
Priority to PL16710928T priority Critical patent/PL3325804T3/en
Publication of EP3325804A1 publication Critical patent/EP3325804A1/en
Application granted granted Critical
Publication of EP3325804B1 publication Critical patent/EP3325804B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/06—Mobile combinations
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet

Definitions

  • the invention relates to a method for measuring the pressure generated by an electric motor-driven compressor, preferably by an electric motor via a sliding-crank gear driven reciprocating compressor.
  • the invention relates to a portable small compressor with a driven by an electric motor compressor, preferably small compressor in one
  • Pannen Anlagenndvorrauma for sealing and inflating vehicle tires, with a control device or a control unit for controlling the
  • These portable and lightweight devices include the compressor unit as a pressurized gas source, further comprising a sealant container for a self-sealing sealable in the inflatable article for sealing the tire damage, a valve and distributor unit for sealant and compressed gas and are connected to an inlet line connectable to the compressed gas source at the inflatable
  • the sealant can be applied manually by the user or by means of the air compressor.
  • the procedure for restoring mobility using these breakdown sets requires a number of complex activities to be performed by the user of the Breakdown kits have to be executed manually. These include, for example, the detection of the puncture, the application of the sealant, the monitoring of the sealing process using a pressure gauge and a timer, a defined movement of the vehicle to distribute the sealant and the assessment of the repair result
  • EP 2 196 305 A1 discloses a method for operating a breakdown assistance system which operates with a sealant and includes a compressor, in which connection of the flow of sealant can be effected automatically on the basis of a comparison of a pressure difference with a predetermined threshold value.
  • Pressure sensors are also regularly installed at the location of the compressor where the highest pressure occurs, namely at the compressor outlet. Therefore, the typically high air temperature at the compressor outlet / compressor outlet places special demands on the required pressure sensor. Due to the corresponding adaptation of the pressure sensors to high temperatures, of course, increased Production costs, which in turn mean that electronically-supported breakdown sets are so far little used.
  • the object of the invention was a cost-effective method
  • the dependent on the change in the pressure at the compressor output change of the average motor current of the compressor driving electric motor is determined and as a pressure-proportional size for the operation of the compressor
  • Control device provided in the form of an input or using z.
  • B a user interface displayed.
  • the measurement or determination of the average motor current according to the method of the invention thus does not require a separate pressure sensor. Compared to an electronic pressure sensor, this process is cheaper and much easier to integrate from a production point of view.
  • the thermal load for a pressure sensor is no longer a criterion.
  • a thermal load plays no role and such a shunt resistor can be easily mounted, namely without design changes to the other components are needed.
  • the shunt resistor as a "current sensor” can thus be integrated directly into the circuit of the motor control unit.
  • a further advantageous embodiment is that determines the dependent on the change in pressure at the compressor output change of the average motor current of the compressor driving electric motor and as a pressure-proportional authoritative and essential input of a control device for controlling the
  • Compressor or a device comprising a compressor is provided, possibly as the only reference variable. This makes it possible, directly and depending on the correlation between motor current and output pressure of the compressor
  • Electric motor is in a quadratic dependence on the voltage applied to the compressor outlet back pressure. About a predetermined square
  • Conversion function or value table it is possible to calculate the back pressure with sufficient accuracy for the application.
  • the inventive method is particularly suitable for use in a portable small compressor with a driven by an electric motor
  • Compressor preferably in a small compressor in a breakdown assistance device for sealing and inflating vehicle tires, with a control device for controlling the small compressor and / or the breakdown assistance device, wherein one of the input signals of the control of the output pressure generated by the compressor, the method according to the motor current is determined.
  • such a small compressor is designed so that it has a reciprocating electric motor driven by a reciprocating gear compressor and that the control device with a motor control unit for the driving electric motor and / or a user interface is communicatively connectable, one for determining the average motor current of the electric motor suitable shunt resistor is provided on the electronic engine control unit and the determined by the shunt resistor mean motor current is processed as an input from the controller.
  • the control device with a motor control unit for the driving electric motor and / or a user interface is communicatively connectable
  • one for determining the average motor current of the electric motor suitable shunt resistor is provided on the electronic engine control unit and the determined by the shunt resistor mean motor current is processed as an input from the controller.
  • no pressure sensor is required, wherein, nevertheless, and by the correlation between pressure at the compressor outlet and motor current, the pressure is the decisive factor.
  • the maximum pressure limit of a small compressor in a breakdown assistance device then becomes dependent on a preset for different types of tires and for a maximum pressure
  • Fig. 1 schematically shows the construction of a small compressor in one
  • Fig. 2 is a typical curve for illustrating the dependence of the mean
  • MD Motor Drive
  • UI User Interface
  • an electronic "pressure measurement” is provided, which takes place in the applied here embodiment of the method by evaluating the data of a current sensor in the form of an integrated circuit in the motor control unit 5, not shown here shunt resistor.
  • Electric motor is in a quadratic dependence on the voltage applied to the compressor outlet back pressure.
  • a predefined conversion function or a value table it is possible to calculate the back pressure with sufficient accuracy for the application.
  • Control Device Control Device / Control Unit Engine Control Unit / Motor Driver User Interface

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

Method for measuring the pressure generated by a compressor driven by an electric motor, preferably a reciprocating compressor driven by an electric motor via a slider crank mechanism; in said method, the the mean motor current of the electric motor driving the compressor is determined, and said mean motor current, which is dependent on the pressure variation at the compressor outlet, is supplied to a control device or displayed as a pressure-proportionate input variable for operating the compressor.

Description

Beschreibung  description
Verfahren zur Druckmessung Method for pressure measurement
Die Erfindung betrifft ein Verfahren zur Messung des Druckes, der durch einen elektromotorisch angetriebenen Verdichter erzeugt wird, vorzugsweise durch einen elektromotorisch über ein Schubkurbelgetriebe angetriebenen Hubkolbenverdichter.The invention relates to a method for measuring the pressure generated by an electric motor-driven compressor, preferably by an electric motor via a sliding-crank gear driven reciprocating compressor.
Weiterhin betrifft die Erfindung einen tragbaren Kleinkompressor mit einem von einem Elektromotor angetriebenen Verdichter, vorzugsweise Kleinkompressor in einer Furthermore, the invention relates to a portable small compressor with a driven by an electric motor compressor, preferably small compressor in one
Pannenhilfevorrichtung zum Abdichten und Aufpumpen von Fahrzeugreifen, mit einer Steuerung seinrichtung bzw. einer Kontrolleinheit zur Steuerung der Pannenhilfevorrichtung for sealing and inflating vehicle tires, with a control device or a control unit for controlling the
Pannenhilfevorrichtung. Breakdown device.
Die genannten Verdichter werden z. B. mit oder als Teil von Vorrichtungen zum The mentioned compressor z. B. with or as part of devices for
Abdichten und Aufpumpen aufblasbarer Gegenstände, insbesondere zum Abdichten und Aufpumpen von Kraftfahrzeugreifen benötigt. Solche Vorrichtungen werden Sealing and inflating inflatable objects, in particular for sealing and inflation of motor vehicle tires needed. Such devices will be
„Pannenhilfevorrichtung" oder„Pannensets" genannt. Called "breakdown assistance device" or "breakdown kits".
Diese tragbaren und leichten Vorrichtungen beinhalten die Kompressoreinheit als Druckgasquelle, weisen weiterhin einen Dichtmittelbehälter für ein in den aufblasbaren Gegenstand einfüllbares selbsttätiges Dichtmittel zum Abdichten der Reifenbeschädigung auf, eine Ventil- und Verteilereinheit für Dichtmittel und Druckgas und sind mit einer an die Druckgasquelle anschließbaren Einlassleitung und einer an den aufblasbaren These portable and lightweight devices include the compressor unit as a pressurized gas source, further comprising a sealant container for a self-sealing sealable in the inflatable article for sealing the tire damage, a valve and distributor unit for sealant and compressed gas and are connected to an inlet line connectable to the compressed gas source at the inflatable
Gegenstand anschließbaren Auslassleitung versehen. Provided object connectable outlet.
Hierbei kann das Dichtmittel manuell vom Benutzer oder mithilfe des Luftkompressors appliziert werden. Die Prozedur zur Wiederherstellung der Mobilität mithilfe dieser Pannensets erfordert eine Anzahl von komplexen Tätigkeiten, die vom Benutzer des Pannensets manuell ausgeführt werden müssen. Hierzu zählen z.B. das Erkennen der Reifenpanne, die Applizierung des Dichtmittels, die Überwachung des Abdichtvorgangs mithilfe eines Manometers sowie eines Zeitnehmers, eine definierte Bewegung des Fahrzeuges zur Verteilung des Dichtmittels und die Beurteilung des Reparaturergebnisses Here, the sealant can be applied manually by the user or by means of the air compressor. The procedure for restoring mobility using these breakdown sets requires a number of complex activities to be performed by the user of the Breakdown kits have to be executed manually. These include, for example, the detection of the puncture, the application of the sealant, the monitoring of the sealing process using a pressure gauge and a timer, a defined movement of the vehicle to distribute the sealant and the assessment of the repair result
Die meisten Benutzer der beschriebenen Pannensets sind nicht auf eine Benutzung des entsprechenden Systems trainiert und es ist daher nicht auszuschließen, dass das System nicht wie vorgesehen bedient wird. Dadurch kann eine erfolgreiche Anwendung vereitelt und die Akzeptanz solcher Pannensets stark beeinträchtigt werden. Most users of the breakdown kits described are not trained to use the corresponding system and it is therefore possible that the system is not operated as intended. This can thwart a successful application and greatly affect the acceptance of such breakdown sets.
Aus diesem Grund muss die Bedienung dieser Systeme möglichst einfach und fehlersicher gestaltet werden. Dies erfolgt meist durch Verwendung von allgemeinverständlichen Piktogrammen, durch Sicherheits sperren sowie durch vom Benutzer zu applizierenden Warnaufklebern. Wie in der EP 2 196 305 AI gezeigt, können hierzu auch elektronische Steuer- und Anzeigesysteme zum Einsatz kommen. Die EP 2 196 305 AI offenbart hierzu ein Verfahren zum Betrieb eines mit einem Dichtmittel arbeitenden und einen Kompressor beinhaltenden Pannenhilfesystems, bei dem anhand eines Vergleiches einer Druckdifferenz mit einem vorgegebenen Schwellenwert das Zuschalten des Dichtmittelflusses automatisch erfolgen kann. For this reason, the operation of these systems must be made as simple and failsafe. This is usually done by using generally understandable pictograms, by security lock and by the user to be applied warning labels. As shown in EP 2 196 305 A1, electronic control and display systems can also be used for this purpose. EP 2 196 305 A1 discloses a method for operating a breakdown assistance system which operates with a sealant and includes a compressor, in which connection of the flow of sealant can be effected automatically on the basis of a comparison of a pressure difference with a predetermined threshold value.
Gerade zum Betrieb solcher elektronischen Systeme ist eine elektronische Druckmessung am betriebenen Luftkompressor bzw. ein dem Druck proportionales Especially for the operation of such electronic systems is an electronic pressure measurement on operated air compressor or a pressure proportional
elektrisches/elektronisches Signal erforderlich. Jedoch ist der Einsatz geeigneter elektronischer Drucksensoren im Vergleich zu üblicherweise verwendeten mechanischen Druckanzeigen mit einer signifikanten Kostensteigerung verbunden. electrical / electronic signal required. However, the use of suitable electronic pressure sensors is associated with a significant increase in cost compared to commonly used mechanical pressure gauges.
Drucksensoren sind auch regelmäßig an der Stelle des Verdichters angebracht, an dem der höchste Druck entsteht, nämlich am Verdichterausgang. Daher stellt besonders die typischerweise hohe Lufttemperatur am Verdichterausgang/Kompressorausgang besondere Anforderungen an den benötigten Drucksensor. Aufgrund der entsprechenden Anpassung der Drucksensoren an hohe Temperaturen entstehen natürlich auch erhöhte Produktionskosten, die wiederum dazu führen, dass elektronisch unterstützte Pannensets bisher wenig eingesetzt werden. Pressure sensors are also regularly installed at the location of the compressor where the highest pressure occurs, namely at the compressor outlet. Therefore, the typically high air temperature at the compressor outlet / compressor outlet places special demands on the required pressure sensor. Due to the corresponding adaptation of the pressure sensors to high temperatures, of course, increased Production costs, which in turn mean that electronically-supported breakdown sets are so far little used.
Für die Erfindung bestand daher die Aufgabe, ein kostengünstiges Verfahren Therefore, the object of the invention was a cost-effective method
bereitzustellen zur Druckmessung für ein elektronisch unterstütztes Pannenset und dabei gleichermaßen Gebrauchsdauer und Zuverlässigkeit eines entsprechend ausgerüsteten Kleinkompressors zu erhöhen. to provide pressure measurement for an electronically assisted breakdown set while increasing both the useful life and reliability of a suitably equipped small compressor.
Gelöst wird diese Aufgabe durch die Merkmale des Hauptanspruchs. Weitere vorteilhafte Ausbildungen sind in den Unteransprüchen offenbart. This object is achieved by the features of the main claim. Further advantageous embodiments are disclosed in the subclaims.
Dabei wird die von der Veränderung des Druckes am Verdichterausgang abhängige Veränderung des mittleren Motorstroms des den Verdichter antreibenden Elektromotors ermittelt und als druckproportionale Größe für den Betrieb des Verdichters einer In this case, the dependent on the change in the pressure at the compressor output change of the average motor current of the compressor driving electric motor is determined and as a pressure-proportional size for the operation of the compressor
Steuerung seinrichtung in Form einer Eingangsgröße bereitgestellt oder mit Hilfe z. B. einer Benutzerschnittstelle angezeigt. Die Messung bzw. Ermittlung des mittleren Motorstroms nach dem erfindungsgemäßen Verfahren benötigt somit keinen separaten Drucksensor. Im Vergleich mit einem elektronischen Drucksensor ist dieses Verfahren kostengünstiger und aus produktionstechnischer Sicht viel einfacher zu integrieren. Control device provided in the form of an input or using z. B. a user interface displayed. The measurement or determination of the average motor current according to the method of the invention thus does not require a separate pressure sensor. Compared to an electronic pressure sensor, this process is cheaper and much easier to integrate from a production point of view.
Insbesondere die thermische Belastung für einen Druckzahlsensor ist kein Kriterium mehr. In particular, the thermal load for a pressure sensor is no longer a criterion.
Eine vorteilhafte Weiterbildung besteht darin, dass der mittlere Motorstrom des den Verdichter antreibenden Elektromotors über einen Shunt- Widerstand an einer An advantageous development is that the average motor current of the compressor driving the electric motor via a shunt resistor to a
vorzugsweise elektronischen Motor-Steuerungseinheit (Motor-Treiber) des antreibenden Elektromotors ermittelt wird. Eine thermische Belastung spielt dabei gar keine Rolle und ein solcher Shunt- Widerstand kann ohne weiteres montiert werden, nämlich ohne dass Konstruktionsänderungen an den übrigen Bauteilen nötig werden. Der Shunt- Widerstand als„Stromsensor" kann somit direkt in den Schaltkreis der Motor-Steuerungseinheit integriert werden. Eine weitere vorteilhafte Ausbildung besteht darin, dass die von der Veränderung des Druckes am Verdichterausgang abhängige Veränderung des mittleren Motorstroms des den Verdichter antreibenden Elektromotors ermittelt und als druckproportionale maßgebliche und wesentliche Eingangsgröße einer Steuerungseinrichtung zur Steuerung des preferably electronic engine control unit (motor driver) of the driving electric motor is determined. A thermal load plays no role and such a shunt resistor can be easily mounted, namely without design changes to the other components are needed. The shunt resistor as a "current sensor" can thus be integrated directly into the circuit of the motor control unit. A further advantageous embodiment is that determines the dependent on the change in pressure at the compressor output change of the average motor current of the compressor driving electric motor and as a pressure-proportional authoritative and essential input of a control device for controlling the
Verdichters oder einer einen Verdichter beinhaltenden Einrichtung zur Verfügung gestellt wird, ggf. als einzige Führungsgröße. Damit ist es möglich, direkt und abhängig von der Korrelation zwischen Motorstrom und Ausgangsdruck des Verdichters eine Compressor or a device comprising a compressor is provided, possibly as the only reference variable. This makes it possible, directly and depending on the correlation between motor current and output pressure of the compressor
Steuerung seinrichtung zu betreiben, wobei keine weiteren Sensoren benötigt werden. Dabei wird ausgenutzt, dass der mittlere Strom des den Verdichter antreibenden Control device to operate, with no additional sensors are needed. It is exploited that the average current of the compressor driving
Elektromotors in einer quadratischen Abhängigkeit zu dem am Verdichterausgang anliegenden Gegendruck steht. Über eine vorab bestimmte quadratische Electric motor is in a quadratic dependence on the voltage applied to the compressor outlet back pressure. About a predetermined square
Umrechnungsfunktion oder Wertetabelle ist eine Berechnung des Gegendrucks mit einer für die Anwendung hinreichenden Genauigkeit möglich. Für verschiedene Conversion function or value table, it is possible to calculate the back pressure with sufficient accuracy for the application. For different
Betriebszustände (Spannung, Temperatur) müssen je nach geforderter Genauigkeit verschiedene Umrechnungsfunktionen eingesetzt werden Operating states (voltage, temperature) must be used depending on the required accuracy different conversion functions
Aufgrund seiner einfachen und kostengünstigen Bereitstellung der relevanten Due to its simple and cost-effective provision of the relevant
Eingangsgröße eignet sich das erfindungsgemäße Verfahren besonders zur Anwendung bei einem tragbaren Kleinkompressor mit einem von einem Elektromotor angetriebenenInput variable, the inventive method is particularly suitable for use in a portable small compressor with a driven by an electric motor
Verdichter, vorzugsweise bei einem Kleinkompressor in einer Pannenhilfevorrichtung zum Abdichten und Aufpumpen von Fahrzeugreifen, mit einer Steuerungseinrichtung zur Steuerung des Kleinkompressors und/oder der Pannenhilfevorrichtung , wobei eines der Eingangs signale der Steuerung der durch den Verdichter erzeugte ausgangsseitige Druck ist, der verfahrensgemäß über den Motorstrom ermittelt wird. Compressor, preferably in a small compressor in a breakdown assistance device for sealing and inflating vehicle tires, with a control device for controlling the small compressor and / or the breakdown assistance device, wherein one of the input signals of the control of the output pressure generated by the compressor, the method according to the motor current is determined.
Vorteilhafterweise ist ein solcher Kleinkompressor so ausgebildet, dass er einen elektromotorisch über ein Schubkurbelgetriebe angetriebenen Hubkolbenverdichter aufweist und dass die Steuerungseinrichtung mit einer Motor-Steuerungseinheit für den antreibenden Elektromotor und /oder einer Benutzerschnittstelle kommunizierend verbindbar ist, wobei ein zur Ermittlung des mittleren Motorstrom des Elektromotors geeigneter Shunt- Widerstand an der elektronischen Motor-Steuerungseinheit vorgesehen ist und der durch den Shunt- Widerstand ermittelte mittlere Motorstrom als Eingangsgröße von der Steuerungseinrichtung verarbeitbar ist. Bei einer solchen Erfassung des mittleren Motorstroms ist keinerlei Drucksensor erforderlich, wobei trotzdem und durch die Korrelation zwischen Druck am Verdichterausgang und Motorstrom der Druck die maßgebende Größe darstellt. Advantageously, such a small compressor is designed so that it has a reciprocating electric motor driven by a reciprocating gear compressor and that the control device with a motor control unit for the driving electric motor and / or a user interface is communicatively connectable, one for determining the average motor current of the electric motor suitable shunt resistor is provided on the electronic engine control unit and the determined by the shunt resistor mean motor current is processed as an input from the controller. In such a detection of the average motor current, no pressure sensor is required, wherein, nevertheless, and by the correlation between pressure at the compressor outlet and motor current, the pressure is the decisive factor.
Weiterhin kann die erfolgte Druckmessung über den mittleren Motorstrom Furthermore, the pressure measurement carried out via the average motor current
vorteilhafterweise auch zur Maximaldruckbegrenzung durch eine Kontrolleinheit genutzt werden. Eine zusätzliche mechanische Druckbegrenzung ist dann nicht mehr erforderlich. Bei solch einer Verwendung, beispielsweise zur Maximaldruckbegrenzung eines Kleinkompressors in einer Pannenhilfevorrichtung, wird dann etwa abhängig von einem für unterschiedliche Reifentypen voreingestellten und für einen Maximaldruck advantageously also be used for maximum pressure limitation by a control unit. An additional mechanical pressure limitation is then no longer necessary. In such a use, for example, the maximum pressure limit of a small compressor in a breakdown assistance device, then becomes dependent on a preset for different types of tires and for a maximum pressure
repräsentative Schwellenwert für den mittleren Motorstrom des den Verdichter antreibenden Elektromotors der Kleinkompressor über seine Steuerungseinrichtung abgeschaltet. Representative threshold for the average motor current of the compressor driving electric motor of the small compressor via its control device off.
Anhand eines Ausführungsbeispiels soll die Erfindung näher erläutert werden. Es zeigen Reference to an embodiment of the invention will be explained in more detail. Show it
Fig. 1 den schematisch den Aufbau eines Kleinkompressors in einer Fig. 1 schematically shows the construction of a small compressor in one
elektronisch unterstützten Pannenhilfevorrichtung,  electronically assisted breakdown assistance device,
Fig. 2 eine typische Kurve zur Darstellung der Abhängigkeit des mittleren Fig. 2 is a typical curve for illustrating the dependence of the mean
Motorstroms von Gegendruck am Kompressorausgang,  Motor current from back pressure at the compressor output,
Fig. 1 zeigt schematisch den Aufbau eines Kleinkompressors 1 in einer elektronisch unterstützten Pannenhilfevorrichtung mit einem von einem Elektromotor 2 angetriebenen Hubkolbenverdichter 3 zum Abdichten und Aufpumpen von hier nicht näher dargestellten Fahrzeugreifen. Vorgesehen ist hier außerdem eine Steuerungseinrichtung 4 (MCU = Motor Control Unit) zur Steuerung der Pannenhilfevorrichtung bzw. des Fig. 1 shows schematically the structure of a small compressor 1 in an electronically assisted breakdown assistance device with a powered by an electric motor 2 reciprocating compressor 3 for sealing and inflating vehicle tires not shown here. Also provided here is a control device 4 (MCU = Motor Control Unit) for controlling the breakdown assistance device or the
Kleinkompressors . Die Steuerungseinrichtung 4 steuert über einen Motor-Steuerungseinheit 5 (MD=Motor Drive) die Funktion des Luftkompressors/Kleinkompressors 1, je nach Anforderung des Benutzers auch über die Benutzerschnittstelle 6 (UI=User Interface), also z.B. über ein Schaltpult, eine das Eingangssignal in eine Druckanzeige umwandelnde Einrichtung, ein Bedienpanel oder eine Applikation (App) auf einem Smartphone. Small compressors. The control device 4 controls via a motor control unit 5 (MD = Motor Drive) the function of the air compressor / small compressor 1, depending on the user's request via the user interface 6 (UI = User Interface), eg via a control panel, the input signal in a pressure display converting device, a control panel or an application (App) on a smartphone.
Zum Betrieb der Steuerungseinrichtung 4 ist eine elektronische„Druckmessung" vorgesehen, die in der hier angewandten erfindungsgemäßen Ausführung des Verfahrens durch die Auswertung der Daten eines Stromsensors in Form eines im Schaltkreis der Motor-Steuerungseinheit 5 integrierten, hier nicht näher dargestellten Shunt- Widerstands erfolgt. Die Verarbeitung des mithilfe des Shunt- Widerstands ermittelten mittleren Motorstroms und die über Algorithmen errechnete Korrelation zum Druck auf der Ausgangsseite des Hubkolbenverdichters erfolgt in der Steuerungseinrichtung 4. Hierzu wird ausgenutzt, dass der mittlere Strom des den Verdichter antreibenden For the operation of the control device 4, an electronic "pressure measurement" is provided, which takes place in the applied here embodiment of the method by evaluating the data of a current sensor in the form of an integrated circuit in the motor control unit 5, not shown here shunt resistor. The processing of the determined by means of the shunt resistor average motor current and the algorithm calculated correlation to the pressure on the output side of the reciprocating compressor in the control device 4. This is exploited that the average current of the compressor driving
Elektromotors in einer quadratischen Abhängigkeit zu dem am Verdichterausgang anliegenden Gegendruck steht. Über eine vorab bestimmte Umrechnungsfunktion oder über eine Wertetabelle ist eine Berechnung des Gegendrucks mit einer für die Anwendung hinreichenden Genauigkeit möglich. Electric motor is in a quadratic dependence on the voltage applied to the compressor outlet back pressure. By means of a predefined conversion function or a value table, it is possible to calculate the back pressure with sufficient accuracy for the application.
Für verschiedene Betrieb szustände (Spannung, Temperatur) müssen je nach geforderter Genauigkeit verschiedene Umrechnungsfunktionen eingesetzt werden. Eine typische Kurve zur Darstellung der Abhängigkeit des mittleren Motorstroms von Gegendruck am Verdichterausgang zeigt Fig. 2. Die dort dargestellten Messwerte entsprechen in guter Genauigkeit einer in der angenäherten eingefügten Kurve dargestellten quadratisch- funktionalen Abhängigkeit. Bezugszeichenliste For different operating states (voltage, temperature), different conversion functions must be used depending on the required accuracy. A typical curve for illustrating the dependence of the average motor current on the back pressure at the compressor output is shown in FIG. 2. The measured values shown there correspond with good accuracy to a quadratic-functional dependence shown in the approximated inserted curve. LIST OF REFERENCE NUMBERS
(Teil der Beschreibung)  (Part of the description)
Kleinkompres sor Kleinkompres sor
Elektromotor  electric motor
Hubkolbenverdichter  reciprocating
Kontroll- oder Steuerungseinrichtung / Kontolleinheit Motor-Steuerungseinheit / Motortreiber Benutzerschnittstelle  Control Device / Control Unit Engine Control Unit / Motor Driver User Interface

Claims

Patentansprüche claims
1. Verfahren zur Messung des Druckes, der durch einen elektromotorisch 1. A method of measuring the pressure generated by an electric motor
angetriebenen Verdichter erzeugt wird, vorzugsweise durch einen elektromotorisch über ein Schubkurbelgetriebe angetriebenen Hubkolbenverdichter (3), dadurch gekennzeichnet, dass die von der Veränderung des Druckes am Verdichterausgang abhängige Veränderung des mittleren Motorstroms des den Verdichter antreibenden Elektromotors (2) ermittelt und als druckproportionale Größe für den Betrieb des Verdichters einer Steuerungseinrichtung (4) in Form einer Eingangsgröße bereitgestellt wird oder angezeigt wird.  driven compressor is produced, preferably by an electric motor via a slider crank drive driven reciprocating compressor (3), characterized in that the change of the pressure at the compressor output dependent change in the average motor current of the compressor driving electric motor (2) determined and as a pressure-proportional size for the Operation of the compressor of a control device (4) is provided in the form of an input variable or is displayed.
2. Verfahren nach Anspruch 1, bei dem der mittlere Motorstrom des den Verdichter antreibenden Elektromotors (2) über einen Shunt- Widerstand an einer vorzugsweise elektronischen Motor-Steuerungseinheit (5) des antreibenden Elektromotors ermittelt wird. 2. The method of claim 1, wherein the average motor current of the compressor driving the electric motor (2) via a shunt resistor to a preferably electronic motor control unit (5) of the driving electric motor is determined.
3. Verfahren nach einem der Ansprüche 1 oder 2, bei dem die von der Veränderung des Druckes am Verdichterausgang abhängige Veränderung des mittleren 3. The method according to any one of claims 1 or 2, wherein the dependent on the change in the pressure at the compressor output change of the mean
Motorstroms des den Verdichter antreibenden Elektromotors ermittelt und als druckproportionale Eingangsgröße einer Steuerungseinrichtung (4) zur Steuerung des Verdichters (3) zur Verfügung gestellt wird.  Motor current of the compressor driving electric motor determined and as a pressure-proportional input variable of a control device (4) for controlling the compressor (3) is provided.
4. Tragbarer Kleinkompressor (1) mit einem von einem Elektromotor (2) 4. Portable small compressor (1) with one of an electric motor (2)
angetriebenen Verdichter (3), vorzugsweise Kleinkompressor in einer  driven compressor (3), preferably small compressor in one
Pannenhilfevorrichtung zum Abdichten und Aufpumpen von Fahrzeugreifen, mit einer Steuerungseinrichtung (4) zur Steuerung des Kleinkompressors und/oder der Pannenhilfevorrichtung , wobei eines der Eingangssignale der Steuerung der durch den Verdichter (3) erzeugte ausgangsseitige Druck ist, und zur Messung des Druckes ein Verfahren nach einem der Ansprüche 1 bis 3 verwendet wird. Kleinkompressor nach Anspruch 4, der mindestens einen elektromotorisch über ein Schubkurbelgetriebe angetriebenen Hubkolbenverdichter (3) aufweist und bei dem die Steuerungseinrichtung (4) mit einer Motor-Steuerungseinheit (5) für den antreibenden Elektromotor und /oder einer Benutzerschnittstelle (6) Passenger assistance device for sealing and inflating vehicle tires, comprising a control device (4) for controlling the small compressor and / or the breakdown assistance device, wherein one of the input signals of the control of the output side pressure generated by the compressor (3), and a method for measuring the pressure one of claims 1 to 3 is used. A small compressor as claimed in claim 4, comprising at least one reciprocating compressor (3) driven by an electric motor via a slider-crank mechanism and in which the control device (4) is provided with a motor control unit (5) for the driving electric motor and / or a user interface (6).
kommunizierend verbindbar ist, wobei ein zur Ermittlung des mittleren is communicatively connectable, with one for determining the middle
Motorstrom des Elektromotors geeigneter Shunt-Widerstand an der elektronischen Motor-Steuerungseinheit (5) vorgesehen ist und der durch den Shunt-Widerstand ermittelte mittlere Motorstrom als Eingangsgröße von der Steuerungseinrichtung (4) verarbeitbar ist. Motor current of the electric motor suitable shunt resistor to the electronic motor control unit (5) is provided and the determined by the shunt resistor mean motor current is processed as an input from the control device (4).
Verwendung des Verfahrens nach Anspruch 1 bis 3 zur Maximaldruckbegrenzung eines Kleinkompressors in einer Pannenhilfevorrichtung, wobei abhängig von einem für unterschiedliche Reifentypen voreingestellten und für einen Use of the method according to claim 1 to 3 for limiting the maximum pressure of a small compressor in a breakdown assistance device, wherein depending on a preset for different types of tires and for a
Maximaldruck repräsentative Schwellenwert für den mittleren Motorstrom des den Verdichter antreibenden Elektromotors der Kleinkompressor über seine Maximum pressure representative threshold for the average motor current of the compressor driving electric motor of the small compressor via its
Steuerungseinrichtung abgeschaltet wird. Control device is turned off.
EP16710928.9A 2015-07-24 2016-03-03 Pressure measurement method Active EP3325804B1 (en)

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