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EP2743509B1 - Détection de fonctionnement à sec de pompe d'alimentation - Google Patents

Détection de fonctionnement à sec de pompe d'alimentation Download PDF

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Publication number
EP2743509B1
EP2743509B1 EP12196489.4A EP12196489A EP2743509B1 EP 2743509 B1 EP2743509 B1 EP 2743509B1 EP 12196489 A EP12196489 A EP 12196489A EP 2743509 B1 EP2743509 B1 EP 2743509B1
Authority
EP
European Patent Office
Prior art keywords
dry run
feed pump
drive motor
electric drive
detecting
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.)
Active
Application number
EP12196489.4A
Other languages
German (de)
English (en)
Other versions
EP2743509A1 (fr
Inventor
Josef Zimmermann
Witold Joschko
Stephan Riefers
Predrag Stevanovic
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.)
Pierburg GmbH
Pierburg Pump Technology GmbH
Original Assignee
Pierburg GmbH
Pierburg Pump Technology 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 Pierburg GmbH, Pierburg Pump Technology GmbH filed Critical Pierburg GmbH
Priority to EP12196489.4A priority Critical patent/EP2743509B1/fr
Publication of EP2743509A1 publication Critical patent/EP2743509A1/fr
Application granted granted Critical
Publication of EP2743509B1 publication Critical patent/EP2743509B1/fr
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Classifications

    • 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
    • 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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • 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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
    • F04D15/0254—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being speed or load

Definitions

  • the invention relates to a method for monitoring the dry running of a feed pump, in particular a flow pump for coolant circuits, which is driven by an electric drive motor, wherein a speed detection sensor is used to monitor the dry running.
  • Coolant pump flow pumps generally serve to deliver a liquid coolant for cooling an internal combustion engine.
  • Delivery pumps as used in coolant circuits, are those which are installed on the suction side and the pressure side in a pipeline. Delivery pumps are not self-priming, therefore, the suction lines must always be filled with liquid, or a sufficiently large volume of liquid before the actual pump inlet to be present. Such feed pumps are therefore very susceptible to even short-term dry running, since, for example, the electric drive motor or a seal assembly can overheat, so that it can lead to stress cracks, leaks and even damage or failure of the electric drive motor. Furthermore, a longer operation in the state of dry running in flow pumps for coolant circuits, among others Lead to bearing damage. Another consequence of dry running can be seen in the fact that with longer-lasting dry running, the coolant systems fail because no more coolant is promoted, and thus can damage the engine come.
  • Such monitoring of the dry running of the feed pump can also be used, for example, for the purpose of detecting the air bubbles, which are partly formed during the filling of the coolant circuit, in the pump housing. Larger accumulations of air in coolant circuits or even leaks with emptying of the coolant circuit can result in the fact that no more reliable cooling of the system to be cooled can be guaranteed and that the delivery pump itself can be damaged.
  • a method for monitoring the dry running of a feed pump in which the operating and receiving current of the drive motor for the assessment of dry running can be detected and measured.
  • the electric current of the Drive motor is dependent on the medium to be conveyed, ie, the higher the viscosity of the medium to be delivered, the higher the operating current increases.
  • This minimum operating current when compared to a setpoint, can be used to shut down the drive motor.
  • Object of the present invention is therefore to provide a method for monitoring the dry running of a feed pump without additional sensors of the type mentioned, in which the dry running monitoring in procedural and device technology simple manner.
  • a method for monitoring the dry running of a feed pump wherein a speed detection sensor is used to monitor the dry running.
  • the delivery pump is a flow pump for coolant circuits.
  • the feed pump is driven by an electric drive motor.
  • the electric drive motor is removed from a known initial state, a previously applied voltage or introduced a defined energy input into the electric drive motor, whereupon the electric drive motor is allowed to leak to a defined final state.
  • the speed detection sensor By the speed detection sensor, the number of revolutions of a motor rotor are detected starting from the defined time, which may be defined either by the application or removal of the previously applied voltage, or from the time of the defined energy input until reaching the defined final state of the electric drive motor , The detected number of revolutions is compared with a previously defined threshold. When the defined threshold value is exceeded, a dry run of the feed pump is concluded.
  • the method described is based on the fact that the motor rotor of the electric drive motor, depending on the coolant level on the motor rotor, is braked to different degrees. Since air in contrast to coolant has a much lower resistance, the motor rotor rotates, in the presence of more air in the space of the feed pump and thus a possible dry running of the motor rotor, with a much larger number of revolutions. Due to the different degrees of deceleration and the resulting speed difference can be detected by the speed detection sensor a unique number of revolutions of the motor rotor. Due to the detected number of revolutions, a safe distinction between wet and dry running can be made. If a previously defined threshold value is exceeded, a dry-running error is triggered by a control unit.
  • the speed detection sensor is realized by a Hall sensor.
  • an opto-electronic dry run monitoring is conceivable in which a light beam is directed to the motor rotor and the reflected light is registered, for example, by a photodiode.
  • the speed detection sensor detects the number of revolutions of the motor rotor when the electric drive motor is coasting.
  • a recording of the revolutions of the motor rotor is performed by the speed detection sensor both during start-up, as well as during the discharge process.
  • the rotation speed detection sensor can detect the revolutions both during the start-up and during the coast-down operation. By this measure, the time interval of the measurement is increased and allows a more meaningful detection of the revolutions.
  • the defined initial state of the electric drive motor can be determined in various ways.
  • the defined initial state can be determined for example by a defined initial voltage.
  • the defined initial state can also be defined by a defined initial speed.
  • corresponding individual advantages result for the different initial states.
  • the defined end state is determined by a defined final speed.
  • a defined initial speed is selected as a defined initial state.
  • a defined final speed is advantageous because a speed other than zero means that the electric drive motor does not have to be stopped completely and thus must be restarted as a result, but that the defined final state during normal operation of the electric drive motor can be realized.
  • the defined final speed is determined by the stoppage of the electric drive motor.
  • the standstill of the electric drive motor is defined by a speed of 0 revolutions per minute. A standstill of the electric drive motor is advantageous because this state can be set very accurately and thus it can only lead to lower measurement errors.
  • the defined final state in addition to the standstill of the electric drive motor, also be set by the expiration of a defined time interval.
  • the defined time interval is in particular 500 to 2000 ms.
  • conventional drives have a mass inertia, which means that changes to the electric drive motor are executed only delayed, so that a defined time interval between 500 and 2000 ms is to be selected. Through this defined time interval ensures that a representative evaluation of the number of revolutions of the motor rotor is possible, the length of the time interval is to be selected so that in this time interval no damaging the electric drive motor overload by a dry run is possible.
  • the acceleration of the electric drive motor can take place both starting from a standstill of the electric drive motor, as well as from the existing operation.
  • the method can be carried out both at the beginning of the starting process of the electric drive motor, ie from a standstill, as well as during operation, ie, starting from a defined initial speed.
  • the acceleration of the electric drive motor by the electronic unit can be effected on the basis of corresponding signals for a defined time interval of 200 to 1000 ms.
  • the control unit for outputting the error message includes, for example, a processor in which a map with a corresponding threshold value is specified and stored.
  • the processor compares the respective number of revolutions with this previously defined threshold value and, if necessary, causes the output of an error message.
  • the senor used for commutation is also used in the method according to the invention for detecting the revolutions of the motor rotor of the electric drive motor. In this way, a monitoring and timely response to a dry run in a simple manner without constructive intervention in the feed pump possible. By using the speed detection sensor already located in the electric drive motor no additional components are required. This leads to the saving of costs.
  • a corresponding first map group is defined in the control unit, based on which the threshold, which is decisive for the outputting of the error message by the control unit, is defined.
  • the dry run detection can be performed from different speeds.
  • a dynamic sensor is used in addition to the speed detection sensor located in the electric drive motor.
  • the dynamic sensor By the dynamic sensor, a deviation of the stored in a second map ratio of motor voltage and speed is registered.
  • This dynamic sensor in contrast to the sensor for detecting the rotations of the motor rotor, continuously active. Due to the continuous activity, the sensors can be seen mutually as safety sensors. In the event of failure of one of the two sensors, the respective other sensor registers the current operating states and, in the event of an emergency, issues a corresponding error message.
  • a method for monitoring the dry running of an electric drive motor with which, in particular, the dry running occurring during operation can be detected without having to completely interrupt the actual operation of the pump.
  • the electric drive motor speed sensor due to the already located in the electric drive motor speed sensor no structural changes must be made and no additional components are installed.
  • a dry run of the feed pump and thus damage to both the feed pump and the electric drive motor can be avoided without the need for additional sensors or the like.
  • FIG. 1 An embodiment of a method according to the invention is in the FIG. 1 is shown as a schematic flowchart and will be described below.
  • the inventive method begins with the start of the function for monitoring the dry-running, starting from a known initial state.
  • the feed pump from standstill for 500 ms applied to a defined voltage and thus accelerates the electric drive motor.
  • the voltage previously applied by the electric drive motor is removed and the electric drive motor can run out over a time interval of 1000 ms up to a defined final state.
  • the standstill of the electric drive motor ie, a speed of 0 revolutions per minute
  • the number of hall edges registered by the Hall sensor is detected, see FIG. 2 ,
  • FIG. 2 illustrates the plot of the number of Hall edges over the defined time interval or the defined speed. Only when the edge is falling, the number of Hall edges is registered by the Hall sensor.
  • the number of Hall edges can already be registered during startup, ie, with a rising edge.
  • the sum of the registered Hall flanks is increased and achieved a more accurate information.
  • a statement about a tendency to dry running can already be made during the startup process. ie If there is a steeper rise of the flank in the system, dry running of the electric drive motor can be expected. For this purpose, a defined energy input in each case via a PWM signal is supplied to the motor.
  • the number of Hall edges is compared with a previously defined threshold, for example 150 Hall edges. Should the detected Hall edge number, for example with 115 Hall edges, fall below the previously defined threshold value of 150 Hall edges, the control unit does not trigger a dry-running error and the method continues in normal operation. In this case there is no dry run. Exceeds the detected Hall edge number, for example, with a Hall edge number of 170 Hall edges, the predefined threshold of 150 Hall edges, the process is started a second time due to a verification to be performed. This is again assumed by the known initial state and detects the number of Hall edges after removal of the applied voltage to the end of the electric drive motor to a defined final state.
  • a previously defined threshold for example 150 Hall edges.
  • a dry-running error is triggered by the control unit. If the number of Hall edges exceeds the previously defined threshold a second time, a dry-running error is triggered by the control unit. If the number of Hall edges is below the previously defined threshold of, for example, 150 Hall edges, no dry run error message is sent out by the control unit.
  • the defined threshold was previously determined and determined by experiments.
  • FIG. 3 shows the operating conditions of the feed pump driving electric drive motor.
  • the number of Hall edges is below a defined threshold value.
  • FIG. 3 shows the dry running operation above a defined Hall edge number. The defined Hall flank number turns off when the flow pump does not contain a liquid medium, ie only promotes air and thus runs dry. Below this defined Hall edge number, the feed pump runs in normal operation with sufficient liquid within the feed pump.
  • the threshold value to be entered in the control unit is dependent not only on the type of delivery and flow pump and the electric drive motor, but also, for example, on the viscosity of the liquid medium to be delivered, the tube power losses and the like parameters.
  • the temperature of the medium and manufacturing tolerances of the electric drive motor or the motor rotors are relevant for determining the threshold value.
  • wet and dry running over a wide temperature range of the medium for example water or glycol from -10 ° C to +135 ° C, is possible.
  • the defined initial voltage should be at least high enough that the starting torque of the machine is just overcome and the electric drive motor starts smoothly. If the torque is set too low, the electric drive motor unnecessarily consumes power, which can then cause losses and trigger the motor protection device.
  • the known initial state can be characterized both by a defined initial voltage and a defined initial speed.
  • the defined initial state can also be realized by applying a defined energy input to the electric drive motor.
  • the defined final state can be characterized by the passage of a defined time interval, or a defined final speed. Both the initial and final speeds may define a stall or have a non-zero value.

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

Claims (17)

  1. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation, notamment une pompe de circulation pour circuits réfrigérant, entrainée par un moteur d'entrainement électrique, dans lequel un capteur de vitesse de rotation est utilisé pour contrôler le fonctionnement à sec,
    caractérisé en ce que
    basé sur un état initial connu, une tension appliquée est enlevée du moteur d'entrainement ou un apport d'énergie défini est introduit dans ledit moteur d'entrainement électrique, après quoi on laisse ledit moteur d'entrainement électrique décélérer jusqu'à un état final défini,
    dans lequel le nombre de rotations d'un rotor de moteur est détecté par ledit capteur de vitesse de rotation pendant la décélération du moteur d'entrainement électrique jusqu'à l'état final défini, et est comparé à une valeur de seuil définie préalablement,
    dans lequel, lors d'un dépassement de la valeur de seuil définie, l'on déduit un fonctionnement à sec de la pompe d'alimentation.
  2. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que ledit capteur de vitesse de rotation est un capteur à effet Hall.
  3. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que ledit capteur de vitesse de rotation détecte le nombre de rotations du rotor de moteur soit lors du processus de démarrage ou lors du processus de décélération, soit lors du processus de démarrage et de décélération du moteur d'entrainement électrique.
  4. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que l'état initial connu est fixé par une tension initiale définie.
  5. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que l'état initial connu est fixé par une vitesse de rotation initiale définie.
  6. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que l'état final défini est fixé par une vitesse de rotation finale définie.
  7. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 6, caractérisé en ce que la vitesse de rotation finale définie est fixée par l'arrêt du moteur d'entrainement électrique, à savoir par une vitesse de rotation de 0 rotations per minute.
  8. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que l'état final défini est fixé par l'expiration d'un intervalle de temps défini.
  9. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 8, caractérisé en ce que l'intervalle de temps défini est de 500 à 2000 ms.
  10. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 1, caractérisé en ce que le moteur d'entrainement électrique est accéléré jusqu'à l'état initial connu soit à partir de l'arrêt due moteur d'entrainement électrique, soit en cours d'opération.
  11. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur d'entrainement électrique est accéléré par une unité électronique sur la base de signaux appropriées pour un intervalle de temps défini.
  12. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur d'entrainement électrique est accéléré avec un apport d'énergie défini à partir de l'arrêt.
  13. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon la revendication 12, caractérisé en ce que l'intervalle de temps défini est de 200 à 1000 ms.
  14. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que lors de la détection d'un fonctionnement à sec par le dépassement de la valeur de seuil définie, le procédé est exécuté une deuxième fois pour le but de vérification, une unité de commande fournissant une message d'erreur lors d'un autre dépassement de la valeur de seuil définie.
  15. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que, dans ce procédé, le capteur utilisé pour la commutation est aussi utilisé pour le contrôle du fonctionnement à sec du moteur d'entrainement électrique.
  16. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un champ caractéristique correspondant stocké dans ladite unité de commande, su la base duquel la valeur de seuil est définie.
  17. Procédé de contrôle du fonctionnement à sec d'une pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en plus du capteur de vitesse de rotation situé dans ledit moteur d'entrainement électrique, un capteur dynamique est utilisé, ledit capteur dynamique détectant une déviation du rapport de la tension du moteur et la vitesse de rotation stocké dans un deuxième champ caractéristique correspondant.
EP12196489.4A 2012-12-11 2012-12-11 Détection de fonctionnement à sec de pompe d'alimentation Active EP2743509B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12196489.4A EP2743509B1 (fr) 2012-12-11 2012-12-11 Détection de fonctionnement à sec de pompe d'alimentation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12196489.4A EP2743509B1 (fr) 2012-12-11 2012-12-11 Détection de fonctionnement à sec de pompe d'alimentation

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EP2743509A1 EP2743509A1 (fr) 2014-06-18
EP2743509B1 true EP2743509B1 (fr) 2015-07-01

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* Cited by examiner, † Cited by third party
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US8909425B2 (en) * 2013-04-12 2014-12-09 GM Global Technology Operations LLC Speed-based flow device diagnostic system and method
DE102014008716B4 (de) * 2014-06-18 2022-01-13 Wilo Se Verfahren zur Erkennung eines Trockenlaufs
EP3232066B1 (fr) * 2016-04-11 2020-09-02 Bosch Termoteknik Isitma ve Klima sanayi Ticaret Anonim Sirketi Dispositif de préparation d'eau et procédé de fonctionnement d'un dispositif de préparation d'eau
GB2604188A (en) * 2021-02-22 2022-08-31 Edwards Tech Vacuum Engineering Qingdao Co Ltd Control of liquid ring pump

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JPS6183423A (ja) * 1984-09-29 1986-04-28 Nissan Motor Co Ltd 内燃機関の沸騰冷却装置におけるポンプ異常診断装置
JP2860408B2 (ja) * 1989-11-14 1999-02-24 三相電機 株式会社 電動ポンプ系の異常検出方法
DE10101099B4 (de) 2001-01-12 2006-09-14 Schmalenberger Gmbh & Co Verfahren zum Überwachen des Trockenlaufs einer Förderpumpe und nach dem Verfahren arbeitende Förderpumpe
DE10234630A1 (de) * 2002-07-29 2004-04-08 Wilo Ag Verfahren zur Bestimmung der Durchflussmenge eines Fluids durch eine Pumpe
US20090151801A1 (en) * 2007-12-12 2009-06-18 John Gorman Method, system and apparatus for an efficient design and operation of a pump motor

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