EP0893582B1 - Method for controlling a coolant pump of an internal combustion engine - Google Patents

Method for controlling a coolant pump of an internal combustion engine Download PDF

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Publication number
EP0893582B1
EP0893582B1 EP98890207A EP98890207A EP0893582B1 EP 0893582 B1 EP0893582 B1 EP 0893582B1 EP 98890207 A EP98890207 A EP 98890207A EP 98890207 A EP98890207 A EP 98890207A EP 0893582 B1 EP0893582 B1 EP 0893582B1
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EP
European Patent Office
Prior art keywords
coolant pump
pump
motor
signal
speed
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EP98890207A
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German (de)
French (fr)
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EP0893582A2 (en
EP0893582A3 (en
Inventor
Peter Dipl.-Ing. Bobretzky
Harald Ing. Pastleitner
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TCG UNITECH GmbH
Pierburg GmbH
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TCG Unitech AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • 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
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • 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
    • F04D15/0077—Safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2031/00—Fail safe
    • F01P2031/36—Failure of coolant pump

Abstract

The method involves controlling a coolant pump of a combustion engine, whereby a heat quantity to be conducted is determined from at least one motor operating parameter, and a pulse width modulation of a control signal for a nominal number of revolutions of the coolant pump is produced in dependence on the heat quantity. The signal is examined for errors through comparisons with a predefined nominal signal range. If an error of the signal is determined, an emergency program for the coolant pump is performed, otherwise the number of revolutions of the coolant pump is regulated in response to the produced signal.

Description

Die Erfindung betrifft ein Verfahren zur Steuerung einer Kühlmittelpumpe einer Brennkraftmaschine, wobei die abzuführende Wärmemenge aus zumindest einem Motorbetriebsparameter bestimmt und mittels Pulsweitenmoduiation ein Steuersignal für die Solldrehzahl der Kühlmittelpumpe in Abhängigkeit der abzuführenden Wärmemenge erzeugt wird, wobei

  • a) das Signals durch Vergleichen mit einem vordefinierten Sollsignalbereich auf Fehler überprüft wird,
  • b) ein Notfallprogramm für die Kühlmittelpumpe durchgeführt wird, wenn in Schritt a) ein Fehlwert des Signals festgestellt wurde,
  • c) die Drehzahl der Kühlmittelpumpe aufgrund des erzeugten Signales für die Soltdrehzahl geregelt wird, wenn in Schritt a) kein Fehlwert des Signales festgestellt wurde.
    • The invention relates to a method for controlling a coolant pump of an internal combustion engine, the amount of heat to be removed being determined from at least one engine operating parameter and a control signal for the setpoint speed of the coolant pump being generated as a function of the amount of heat to be removed by means of pulse width modulation, wherein
  • a) the signal is checked for errors by comparing it with a predefined target signal range,
  • b) an emergency program for the coolant pump is carried out if an incorrect value of the signal was determined in step a),
  • c) the speed of the coolant pump is regulated on the basis of the generated signal for the brine speed if no faulty value of the signal was found in step a).

    • Weiters betrifft die Erfindung eine elektrisch angetriebene Kühimittelpumpe für eine Brennkraftmaschine, mit einer Elektromotor-Pumpeneinheit und einer elektronischen Steuereinheit zur Erzeugung eines pulsweitenmodulierten Steuersignals für die Pumpe in Abhängigkeit zumindest eines Motorbetriebsparameters, wobei die vorzugsweise in das Motormanagement integrierte Steuereinheit mit einem Fehlerdetektor zur Erkennung von abnormen Steuersignalen und Pumpenbetriebszuständen und mit einem Drehzahlregler für die Pumpendrehzahl verbunden ist, wobei der Fehlerdetektor eine Notfalleinrichtung für die Kühlmittelpumpe aufweist.Furthermore, the invention relates to an electrically driven coolant pump for an internal combustion engine, with an electric motor pump unit and electronic control unit for generating a pulse width modulated Control signal for the pump depending on at least one Engine operating parameters, which preferably in the engine management Integrated control unit with an error detector to detect abnormalities Control signals and pump operating states and with a speed controller for the pump speed is connected, the error detector being a Has emergency equipment for the coolant pump.

    Aus der US 4 836 147 A ist eine elektrisch angetriebene Kühtmittelpumpe der genannten Art bekannt, deren elektronisch kommutierter Gleichstrommotor durch Pulsweitenmodulation von einer elektronischen Steuereinheit In Abhängigkeit von der Temperatur der Brennkraftmaschine gesteuert wird. Dadurch kann der Kühlmitteldurchsatz durch Veränderung der Pumpendrehzahl den Erfordernissen angepasst werden. Weitere Kühlmittelpumpen, deren Drehzahlsteuerung auf Pulsweitenmodulation beruht, sind aus der US 5 529 114 A und der US 5 309 730 A bekannt. Notfalleinrichtungen im Falle eines Signalfehlwertes sind keine vorgesehen.An electrically driven coolant pump is known from US Pat. No. 4,836,147 known type, whose electronically commutated DC motor by pulse width modulation from an electronic control unit In Is controlled depending on the temperature of the internal combustion engine. This can reduce the coolant throughput by changing the pump speed be adapted to requirements. Other coolant pumps, their Speed control based on pulse width modulation are known from US 5,529,114 A and US 5,309,730 A are known. Emergency facilities in the event of a No signal error values are provided.

    Ferner beschreibt die DE 37 38 412 A1 ein Kühlmittelsystem für einen Motor mit zwei elektrischen und einer mechanischen Kühlmittelpumpe. Die elektrischen Kühlmittelpumpen sind über ein elektronisches Schaltgerät steuerbar. Bei Ausfall einer Kühlmittelpumpe wird ein Notlaufbetrieb eingeleitet, um einen Notbetrieb des Motors aufrecht zu erhalten. Dadurch ist nach Abgabe eines entsprechenden Warnsignals oder einem Eingriff in die Motorsteuerung ein Motorbetrieb mit reduzierter Leistung möglich.DE 37 38 412 A1 also describes a coolant system for an engine two electrical and one mechanical coolant pump. The electrical Coolant pumps can be controlled via an electronic switching device. In the event of failure A coolant pump initiates an emergency operation to an emergency operation of the engine. This is after submitting a corresponding Warning signal or an intervention in the engine control an engine operation with reduced performance possible.

    In der DE 38 10 174 Alwird eine Einrichtung zur Regelung der Kühlmitteltemperatur einer Brennkraftmaschine beschrieben, wobei die Regelung der Kühlmitteitemperatur in Abhängigkeit der Last und der Drehzahl der Brennkraftmaschine erfolgt. Es sind keine Anregungen zu entnehmen, um bei Störungen im Pumpenbetrieb ein Notfallprogramm für die Kühlmittelpumpe durchzuführen.DE 38 10 174 A1 describes a device for regulating the Coolant temperature of an internal combustion engine described, the control the coolant temperature depending on the load and the speed of the Internal combustion engine takes place. There are no suggestions to be made at Malfunctions in pump operation an emergency program for the coolant pump perform.

    Die DE 37 02 947 A1 beschreibt eine Kühleinrichtung für eine Brennkraftmaschine mit einer Wasserpumpe und einem Ventilator, wobei ein Elektromotor den Ventilator oder die Wasserpumpe antreibt. Zur Ansteuerung des Elektromotors ist ein Notfallprogramm vorgesehen, das bei Ausfall des Temperaturfühlers oder einer ähnlichen Störung im Hinblick auf das Temperatursignal den Elektromotor mit voller Drehzahl betreibt. Dadurch soll die maximale Kühlleistung auf jeden Fall sichergestellt und das Kühlsystem vor einer Überhitzung geschützt werden. Maßnahmen für den Falle eines Steckenbleibens der Kühtmittetpumpe sind nicht vorgesehen.DE 37 02 947 A1 describes a cooling device for a Internal combustion engine with a water pump and a fan, one Electric motor drives the fan or the water pump. For control of the electric motor, an emergency program is provided which, if the Temperature sensor or a similar fault with regard to the Temperature signal operates the electric motor at full speed. This is supposed to maximum cooling capacity guaranteed in any case and the cooling system before Protect overheating. Measures in the event of getting stuck the coolant pump are not provided.

    Die JP 61-083423 A1 behandelt eine Diagnoseeinrichtung zur Erkennung von Abnormalitäten während des Betriebes einer Kühlwasserpumpe. Dabei wird das ungewöhnliche Ansteigen der Drehzahl und des vom Motor aufgenommenen Stromes als Anzeichen für das Auftreten einer Abnormalität, wie beispielsweise Kavitation, angesehen. Konkrete Maßnahmen für Betriebsstörungen der Wasserpumpe, wie Steckenbleiben, Trockenlauf oder mechanische Überlastung sind nicht vorgesehen.JP 61-083423 A1 deals with a diagnostic device for the detection of Abnormalities during the operation of a cooling water pump. It will unusual increase in engine speed and engine speed Current as an indication of the occurrence of an abnormality, such as Cavitation. Concrete measures for malfunctions in the Water pump, such as getting stuck, running dry or mechanical overload are not provided.

    Die praktische Anwendung von elektrisch angetriebenen Kühlmittelpumpen zeigt, dass beim Betrieb Unregelmäßigkeiten und Störungen auftreten können, die, wenn sie nicht rechtzeitig erkannt und behoben werden, in weiterer Folge zu reparaturaufwendigen Schäden am Kühlsystem und an der Brennkraftmaschine führen können. So kann es nach längerem Stillstand zu einem Festfressen des Pumpenrotors kommen, was bei nicht rechtzeitiger Behebung zur mechanischen Zerstörung des Elektromotors und in weiterer Folge zur thermischen Überlastung der Brennkraftmaschine führen kann. Andererseits ist bei Kühlmittelpumpen, bei denen der Elektromotor und die Pumpe als Einheit ausgeführt ist, die Rotorwelle nicht ohne weiteres von außen zugänglich, um sie durch mechanische Krafteinwirkung zu lösen.The practical application of electrically driven coolant pumps shows that irregularities and malfunctions can occur during operation that if they are not recognized and remedied in time, subsequently to Damage to the cooling system and the internal combustion engine that requires extensive repair being able to lead. This can lead to seizure after a long period of inactivity Pump rotors come, which if not corrected in time for mechanical Destruction of the electric motor and subsequently to thermal overload the internal combustion engine can lead. On the other hand, with coolant pumps, which the electric motor and the pump are designed as a unit, the rotor shaft not easily accessible from the outside to mechanical To release force.

    Kommt es zu einem Ausfall oder einem Fehlwert des Steuersignals für den Elektromotor, so kann dies ebenfalls zum Versagen des Kühlsystems durch Stillstand der Pumpe führen. If there is a failure or an incorrect value of the control signal for the Electric motor, this can also cause the cooling system to fail Stop the pump.

    Es ist die Aufgabe der Erfindung, diese Nachteile zu vermeiden und Maßnahmen gegen Unregelmäßigkeiten und Störungen im Pumpenbetrieb vorzusehen.It is the object of the invention to avoid these disadvantages and take measures against irregularities and malfunctions in pump operation.

    Erfindungsgemäß wird dies dadurch erreicht, dass das Notfallprogramm vorsieht, dass im Falle des Steckenbleibens der Kühlmittelpumpe ein Losbrechprogramm aktiviert wird. Dabei ist vorgesehen, dass der Fehlerdetektor mit einem Hall-Sensor an der Elektromotor-Pumpeneinheit verbunden ist. Die Kühimittelpumpe wird dabei zumindest während des Startvorganges auf Steckenbleiben überwacht und im Falle des Steckenbleibens wird ein Losbrechprogramm aktiviert. Weiters kann vorgesehen sein, dass das Notfallprogramm vorsieht, dass bei Trockenlauf und/oder mechanischer Überlastung der Elektromotor für eine vordefinierte Zeitdauer abgeschaltet wird.According to the invention, this is achieved in that the emergency program provides that a breakaway program if the coolant pump gets stuck is activated. It is envisaged that the error detector with a Hall sensor is connected to the electric motor pump unit. The coolant pump is monitored for sticking at least during the starting process and if you get stuck, a breakaway program is activated. Furthermore, it can be provided that the emergency program provides for dry running and / or mechanical overload of the electric motor for a predefined one Period is switched off.

    Von der Steuereinheit wird über Sensoren die abzuführende Wärmemenge ermittelt und ein pulsweitenmoduliertes Signal für die Solldrehzahl der Kühlmittelpumpe in Abhängigkeit der abzuführenden Wärmemenge erzeugt. Das Signal wird sodann auf Fehler durch Vergleichen mit einem vordefinierten Sollsignalbereich überprüft. Bei Feststellen eines Fehlwertes im Signal wird ein Notfallprogramm für die Kühlmittelpumpe gestartet, welches eine ausreichende Kühlung der Brennkraftmaschine gewährleistet. Wird kein Fehlwert des Signales festgestellt, wird das Signal als Sollwert dem Drehzahlregler zugeführt, und die Drehzahl der Kühlmittelpumpe abgeregelt. Diese Schritte werden kontinuierlich bzw. in vordefinierten Abständen wiederholt.The amount of heat to be dissipated is transferred from the control unit via sensors determined and a pulse width modulated signal for the target speed of the Coolant pump generated depending on the amount of heat to be dissipated. The Signal is then checked for errors by comparing it with a predefined one Checked target signal range. If an error value is found in the signal, a Emergency program for the coolant pump started, which is sufficient Cooling of the engine ensured. Does not become an error value of the signal determined, the signal is fed to the speed controller as a setpoint, and the Coolant pump speed regulated. These steps are ongoing or repeated at predefined intervals.

    Vorzugsweise ist- vorgesehen, dass das Notfallprogramm vorsieht, daß die Kühimittelpumpe mit der die höchste Kühlleistung im Dauerbetrieb ermöglichenden Drehzahl betrieben wird, wobei es vorteilhaft ist, wenn die Notfalleinrichtung eine Kurzschlussschaltung für ein Notsteuersignal des Elektromotors aufweist.It is preferably provided that the emergency program provides that the Coolant pump with the highest cooling capacity in continuous operation enabling speed is operated, it being advantageous if the Emergency device a short circuit for an emergency control signal from the Has electric motor.

    Im Hinblick auf Wartungsfreundlichkeit, Minimierung der Störanfälligkeit und des Herstellungsaufwandes ist es vorteilhaft, wenn die elektronischen Schaltungskreise für die Erzeugung des Steuersignals einerseits und für die Drehzahlregelung und Fehlerdetektion andererseits räumlich getrennt angeordnet sind, wobei vorzugsweise der Fehlerdetektor und der Drehzahlregler in die Elektromotor-Pumpeneinheit integriert sind. Die Erfindung wird anhand des in der Figur gezeigten Blockschaltbildes näher erläutert.With regard to ease of maintenance, minimizing susceptibility to faults and Manufacturing effort, it is advantageous if the electronic Circuits for the generation of the control signal on the one hand and for the On the other hand, speed control and error detection are spatially separated are arranged, preferably the error detector and the speed controller are integrated in the electric motor pump unit. The invention is explained in more detail with reference to the block diagram shown in the figure.

    Der mit Wickelschutzkontakt ausgestattete Elektromotor 1 der Motor-Pumpen-Einheit 2 wird über ein Gate 3 mit Strom I versorgt. Das Gate 3 erhält die Steuerspannung U von einem Drehzahlregler 4, welcher aufgrund eines Drehzahlsollwertes nsoll einen Spannungssollwert Usoll erzeugt. Über eine Hallsonde 5 wird dem Drehzahlregler 4 ein Drehzahlistwert nist rückgemeldet. Aus der Differenz zwischen nsoll und nist wird eine neue Stellgröße Usoll gebildet.The electric motor 1 of the motor-pump unit 2, equipped with a winding protection contact, is supplied with current I via a gate 3. The gate 3 receives the control voltage U of a speed controller 4, to which n due to a speed setpoint a voltage reference U soll generated. A speed actual value n is fed back to the speed controller 4 via a Hall probe 5. Should the difference between n and n is a new command value U to be formed.

    Der Drehzahlsollwert nsoll wird aufgrund eines durch eine einen Pulsweitenmodulator aufweisende elektronische Steuereinheit 6 erzeugten pulsweitenmodulierten Steuersignales PWM ermittelt. Die Steuereinheit 6 kann in das Motormanagement der Brennkraftmaschine integriert sein. Die Steuereinheit 6 berechnet aufgrund von Motorbetriebsparametern der Brennkraftmaschine, wie Kühlmitteltemperatur, Kurbelwellendrehzahl, Zylinderdruck oder ähnliches, die erforderliche Wärmeabfuhr und erzeugt daraus das pulsweitenmodulierte Signal PWM, welches als Drehzahlsollwert nsoll dem Drehzahlregler 4 zugeführt wird. Das Signal PWM steht weiters mit einem Spannungsniveau 30 ("pull-up-Klemme") in Verbindung.The speed setpoint n target is determined on the basis of a pulse width modulated control signal PWM generated by an electronic control unit 6 having a pulse width modulator. The control unit 6 can be integrated in the engine management of the internal combustion engine. The control unit 6 calculates the required heat dissipation on the basis of engine operating parameters of the internal combustion engine, such as coolant temperature, crankshaft speed, cylinder pressure or the like, and generates the pulse-width-modulated signal PWM therefrom, which is supplied to the speed controller 4 as the speed setpoint n target. The signal PWM is also connected to a voltage level 30 ("pull-up terminal").

    Das pulsweitenmodulierte Signal PWM bzw. der daraus ermittelte Drehzahlsollwert nsoll wird weiters dem Diagnoseteil 1 eines Fehlerdetektors 7 zugeführt, welcher darüberhinaus noch den Drehzahlistwert nist von der Hallsonde 5, sowie über einen Nebenschluß 8 und einen Digital/Analogwandler 9 noch eine Kontrollsteuerspannung Uk als Funktion des Steuerstromes I empfängt. Der Fehlerdetektor 7 überprüft in durch einen Taktgeber 10 vordefinierten Zeitabschnitten, ob Fehler im pulsweitenmodulierten Signal PWM, im Drehzahlistwert nist oder der Steuerspannung U vorliegen. Der Taktgeber 10 wird über eine Überwachungsschaltung 11 initiiert und überwacht und über eine Niederspannungsquelle 12 mit Energie versorgt, welche an die Masse 31 des Fahrzeuges und die Klemme 15 (Pluspol) des Fahrzeuges angeklemmt ist. To n, the pulse width modulated signal PWM and the speed reference value determined therefrom further the diagnostic part 1 is supplied to an error detector 7, which moreover, the actual speed is still n of the Hall probe 5, as well as a shunt 8 and a digital / analog converter 9 is still a monitoring control voltage U k as a function of the control current I receives. The error detector 7 checks in predefined by a clock 10 time periods, if any errors in the pulse width modulated signal PWM, n is the actual speed or the control voltage U present. The clock 10 is initiated and monitored via a monitoring circuit 11 and supplied with energy via a low-voltage source 12, which is connected to the ground 31 of the vehicle and the terminal 15 (positive pole) of the vehicle.

    Eine Notfalleinrichtung 7b des Fehlerdetektor 7 steht mit einem ersten Kurzschlußstellglied 13 in Verbindung, welches bei Ausfall des pulsweitenmodulierten Signales PWM oder bei fehlerbehaftetem Signal ein Notfallprogramm durchführt und eine Kurzschlußschaltung herstellt und dabei den Elektromotor 1 mit der Steuerspannung U versorgt, welche die höchste Kühlleistung im Dauerbetrieb ermöglicht.An emergency device 7b of the error detector 7 is connected to a first short-circuit actuator 13 in connection, which occurs when the pulse width modulated signal PWM fails or faulty signal performs an emergency program and creates a short circuit while supplying the electric motor 1 with the control voltage U which is the highest Cooling capacity enabled in continuous operation.

    Weiters wird über den Fehlerdetektor 7 durch den Nebenschluß 8 und den Digital/Analogwandler 9 mittels der Kontrollsteuerspannung Uk in Abhängigkeit der Stromstärke I durch Vergleichen mit der Belastungskennlinie des Motors ein Trockenlaufen der Pumpe festgestellt und in diesem Falle über den Steller 16 und das Stellglied 14 der Spannungssollwert Usoll = 0 gesetzt und der Motor 1 heruntergefahren. Darüber hinaus wird über die Notfalleinrichtung 7b des Fehlerdetektors 7 und den Hallsender 5 ein Festfressen der Motor-Pumpen-Einheit 2 festgestellt. In diesem Falle wird über den Fehlerdetektor 7 ein Losbrechprogramm gestartet, welches über die Stellglieder 13 und 14 die Steuerspannung in geeigneter Weise zwischen einem Minimal- und einem Maximalwert oszillierend modifiziert, so daß der Motor 1 ein ausreichend hohes Losbrechmoment erzeugt. Ein hohes Losbrechmoment ist insbesonders dann möglich, wenn der Elektromotor 1 ein synchronlaufender Motor ist. Dadurch wird auch die Regelung vereinfacht.Furthermore, by means of the error detector 7 by the shunt 8 and the digital / analog converter 9 by means of the control voltage U k as a function of the current intensity I by comparison with the load characteristic of the motor a dry running of the pump is determined and in this case by the actuator 16 and the actuator 14 the voltage command value to U = 0, and shut down the engine. 1 In addition, seizure of the motor-pump unit 2 is determined via the emergency device 7b of the error detector 7 and the Hall transmitter 5. In this case, a breakaway program is started via the error detector 7, which modifies the control voltage in a suitable manner between a minimum and a maximum value via the actuators 13 and 14, so that the motor 1 generates a sufficiently high breakaway torque. A high breakaway torque is particularly possible when the electric motor 1 is a synchronous motor. This also simplifies control.

    Um eine einfache Wartung zu ermöglichen und den Herstellungsaufwand zu minimieren, ist zumindest der Drehzahlregler 4 und der Fehlerdetektor 7 in eine elektronische Schaltung 17 in der Motor-Pumpen-Einheit 2 integriert. Dies ermöglicht es, die Motor-Pumpen-Einheit 2 samt Steuerelektronik in einem Modul auszutauschen.To enable easy maintenance and to minimize the manufacturing effort, is at least the speed controller 4 and the error detector 7 in an electronic circuit 17 in the motor-pump unit 2 integrated. This enables the motor-pump unit 2 together Exchange control electronics in a module.

    Claims (10)

    1. A method for controlling a coolant pump of an internal combustion engine, with the heat quantity to be carried off being determined from at least one motor operation parameter and a control signal for the setpoint speed of the coolant pump being produced by means of pulse-width modulation depending on the heat quantity to be carried off, with
      a) the signal being checked for errors with a predetermined setpoint signal range;
      b) an emergency program being executed for the coolant pump when an erroneous value of the signal is determined in step a);
      c) the speed of the coolant pump is controlled for the setpoint speed due to the produced signal when no erroneous value of the signal was determined in step a);
      characterized in that the emergency program provides that in the case that the coolant pump gets stuck a breakaway program is activated.
    2. A method as claimed in claim 1, characterized in that the steps a) to c) are repeated in predetermined intervals.
    3. A method as claimed in claim 1 or 2, characterized in that the emergency provides that the coolant pump is operated with the speed allowing the highest cooling output in continuous operation.
    4. A method as claimed in claim 1 or 2, characterized in that the emergency program provides that in the case of dry running and/or mechanical overload the electric motor is cut off for a predetermined period of time.
    5. An electrically driven coolant pump for an internal combustion engine, with an electro-motor-and-pump unit (2) and an electronic control unit (6) for producing a pulse-width-modulated control signal (PWM) for the pump depending on at least one motor operation parameter, with the control unit (6), which is preferably integrated in the motor management, being connected with a fault detector (7) for recognizing abnormal control signals and pump operation states and with a speed controller (4) for the pump speed (n), with the fault detector (7) comprising an emergency device (7b) for the coolant pump, characterized in that the emergency device (7b) comprises a breakaway circuit which supplies the coolant pump (1) with modulated and/or oscillating control signals when the coolant pump gets stuck.
    6. A coolant pump as claimed in claim 5, characterized in that the fault detector (7) and the speed controller (4) are integrated in the electro-motor-and-pump unit (2).
    7. A coolant pump as claimed in claim 5 or 6, characterized in that the fault detector (7) is connected with a Hall sensor (5) on the electro-motor (1).
    8. A coolant pump as claimed in one of the claims 5 to 7, characterized in that the emergency device (7b) comprises a short-circuit circuit (13) for an emergency control signal of the electro-motor in order to enable the operation of the coolant pump with the speed allowing the highest cooling output in continuous operation.
    9. A coolant pump as claimed in one of the claims 5 to 8, characterized in that the emergency device (7b) comprises a cut-off apparatus (14) which in the case of dry running and/or mechanical overload cuts off the electro-motor (1) for a predetermined period of time.
    10. A coolant pump as claimed in one of the claims 6 to 11, characterized in that the electro-motor (1) is a synchronously running motor.
    EP98890207A 1997-07-23 1998-07-16 Method for controlling a coolant pump of an internal combustion engine Expired - Lifetime EP0893582B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    AT125197 1997-07-23
    AT1251/97 1997-07-23
    AT125197 1997-07-23

    Publications (3)

    Publication Number Publication Date
    EP0893582A2 EP0893582A2 (en) 1999-01-27
    EP0893582A3 EP0893582A3 (en) 2000-01-05
    EP0893582B1 true EP0893582B1 (en) 2002-10-30

    Family

    ID=3509869

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98890207A Expired - Lifetime EP0893582B1 (en) 1997-07-23 1998-07-16 Method for controlling a coolant pump of an internal combustion engine

    Country Status (5)

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    US (1) US6216645B1 (en)
    EP (1) EP0893582B1 (en)
    AT (2) ATE227001T1 (en)
    DE (1) DE59806097D1 (en)
    ES (1) ES2183316T3 (en)

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    Also Published As

    Publication number Publication date
    AT502321A1 (en) 2007-02-15
    EP0893582A2 (en) 1999-01-27
    ES2183316T3 (en) 2003-03-16
    AT502321B8 (en) 2007-08-15
    AT502321B1 (en) 2007-06-15
    AT502321A8 (en) 2007-08-15
    DE59806097D1 (en) 2002-12-05
    US6216645B1 (en) 2001-04-17
    EP0893582A3 (en) 2000-01-05
    ATE227001T1 (en) 2002-11-15

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