EP0893582A2 - 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
EP0893582A2
EP0893582A2 EP98890207A EP98890207A EP0893582A2 EP 0893582 A2 EP0893582 A2 EP 0893582A2 EP 98890207 A EP98890207 A EP 98890207A EP 98890207 A EP98890207 A EP 98890207A EP 0893582 A2 EP0893582 A2 EP 0893582A2
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EP
European Patent Office
Prior art keywords
coolant pump
electric motor
pump
signal
speed
Prior art date
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Granted
Application number
EP98890207A
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German (de)
French (fr)
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EP0893582A3 (en
EP0893582B1 (en
Inventor
Peter Dipl.-Ing. Bobretzky
Harald Ing. Pastleitner
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TCG UNITECH GmbH
Pierburg GmbH
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UNITECH Aktiengesellschsft
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

Definitions

  • the invention relates to a method for controlling a coolant pump of an internal combustion engine, the amount of heat to be removed from at least one engine operating parameter determined and by means of pulse width modulation a control signal for the target speed of the Coolant pump is generated depending on the amount of heat to be dissipated. Furthermore, the invention relates to an electrically driven coolant pump for an internal combustion engine, with an electric motor pump unit and an electronic control unit for determination a pulse width modulated control signal for the pump depending at least an engine operating parameter.
  • DE 37 38 412 A1 describes a coolant system for an engine with two electrical and a mechanical coolant pump.
  • the electric coolant pumps are controllable via an electronic switching device. If a coolant pump fails, a Emergency operation initiated to maintain an emergency operation of the engine. This is after a corresponding warning signal has been issued or an intervention in the engine management system engine operation with reduced power possible.
  • DE 38 10 174 A1 describes a device for regulating the coolant temperature Internal combustion engine described, the control of the coolant temperature depending the load and the speed of the internal combustion engine. There are no suggestions too remove an emergency program for the coolant pump in the event of malfunctions in pump operation perform.
  • control unit with an error detector to detect abnormal control signals and pump operating conditions and with one Speed controller for the pump speed is connected, the error detector being an emergency device for the coolant pump.
  • the control unit uses sensors to determine and dissipate the amount of heat to be dissipated a pulse-width-modulated signal for the setpoint speed of the coolant pump depending the amount of heat to be dissipated.
  • the signal is then compared for errors by comparison checked with a predefined target signal range. If an incorrect value is found An emergency program for the coolant pump is started in the signal, which is sufficient Cooling of the engine ensured. If no faulty value of the signal is found, the signal is fed as a setpoint to the speed controller, and the speed of the Coolant pump shut down. These steps are carried out continuously or at predefined intervals repeated.
  • the emergency program provides that the coolant pump with which the highest cooling capacity is operated in continuous operation, it is advantageous if the emergency device is a short-circuit for an emergency control signal of the electric motor.
  • the error detector with a Hall sensor is connected to the electric motor pump unit.
  • the coolant pump is monitored at least during the starting process for getting stuck and in the event If you get stuck, a breakaway program is activated.
  • the emergency program provides that the dry run and / or mechanical overload of the Electric motor is switched off for a predefined period of time.
  • the electronic circuits for generation the control signal on the one hand and for speed control and error detection on the other are arranged spatially separated, preferably the error detector and the speed controller are integrated in the electric motor pump unit.
  • 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.
  • 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").
  • 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 receives as a function of the control current 1.
  • 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.
  • 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.
  • seizure of the motor-pump unit 2 is determined via the emergency device 7b of the error detector 7 and the Hall transmitter 5.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

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 Pulsweitenmodulation ein Steuersignal für die Solldrehzahl der Kühlmittelpumpe in Abhängigkeit der abzuführenden Wärmemenge erzeugt wird. Weiters betrifft die Erfindung eine elektrisch angetriebene Kühlmittelpumpe für eine Brennkraftmaschine, mit einer Elektromotor-Pumpeneinheit und einer elektronischen Steuereinheit zur Ermittlung eines pulsweitenmodulierten Steuersignales für die Pumpe in Abhängigkeit zumindest eines Motorbetriebsparameters.The invention relates to a method for controlling a coolant pump of an internal combustion engine, the amount of heat to be removed from at least one engine operating parameter determined and by means of pulse width modulation a control signal for the target speed of the Coolant pump is generated depending on the amount of heat to be dissipated. Furthermore The invention relates to an electrically driven coolant pump for an internal combustion engine, with an electric motor pump unit and an electronic control unit for determination a pulse width modulated control signal for the pump depending at least an engine operating parameter.

Aus der US 4 836 147 A ist eine elektrisch angetriebene Kühlmittelpumpe 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.From US 4 836 147 A is an electrically driven coolant pump of the type mentioned known whose electronically commutated DC motor by pulse width modulation of an electronic control unit depending on the temperature of the internal combustion engine is controlled. This can change the coolant throughput Pump speed can 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 Pat US 5,309,730 A is known. Emergency facilities in the event of a signal error value are not intended.

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.Furthermore, DE 37 38 412 A1 describes a coolant system for an engine with two electrical and a mechanical coolant pump. The electric coolant pumps are controllable via an electronic switching device. If a coolant pump fails, a Emergency operation initiated to maintain an emergency operation of the engine. This is after a corresponding warning signal has been issued or an intervention in the engine management system engine operation with reduced power possible.

In der DE 38 10 174 A1 wird eine Einrichtung zur Regelung der Kühlmitteltemperatur einer Brennkraftmaschine beschrieben, wobei die Regelung der Kühlmitteltemperatur 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 Internal combustion engine described, the control of the coolant temperature depending the load and the speed of the internal combustion engine. There are no suggestions too remove an emergency program for the coolant pump in the event of malfunctions in pump operation perform.

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 the Operation irregularities and malfunctions can occur if not timely are recognized and remedied, which subsequently leads to repair-intensive damage to the cooling system and can lead to the internal combustion engine. This can happen after a long standstill seizure of the pump rotor, 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, in coolant pumps in which the Electric motor and the pump is designed as a unit, the rotor shaft not easily accessible from the outside to release them by mechanical force.

Kommt es zu einem Ausfall oder einem Fehlwert des Steuersignales 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, then this can also cause the cooling system to fail due to the pump being at a standstill.

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 to take measures against irregularities and to provide malfunctions in pump operation.

Erfindungsgemäß wird dies dadurch erreicht, daß die 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.According to the invention, this is achieved in that the control unit with an error detector to detect abnormal control signals and pump operating conditions and with one Speed controller for the pump speed is connected, the error detector being an emergency device for the coolant pump.

Dabei wird von der Steuereinheit 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 control unit uses sensors to determine and dissipate the amount of heat to be dissipated a pulse-width-modulated signal for the setpoint speed of the coolant pump depending the amount of heat to be dissipated. The signal is then compared for errors by comparison checked with a predefined target signal range. If an incorrect value is found An emergency program for the coolant pump is started in the signal, which is sufficient Cooling of the engine ensured. If no faulty value of the signal is found, the signal is fed as a setpoint to the speed controller, and the speed of the Coolant pump shut down. These steps are carried out continuously or at predefined intervals repeated.

Vorzugsweise ist vorgesehen, daß das Notfallprogramm vorsieht, daß die Kühlmittelpumpe 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 which the highest cooling capacity is operated in continuous operation, it is advantageous if the emergency device is a short-circuit for an emergency control signal of the electric motor.

In einer besonders bevorzugten Ausführungsform ist vorgesehen, daß der Fehlerdetektor mit einem Hall-Sensor an der Elektromotor-Pumpeneinheit verbunden ist. Die Kühlmittelpumpe 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.In a particularly preferred embodiment it is provided that the error detector with a Hall sensor is connected to the electric motor pump unit. The coolant pump is monitored at least during the starting process for getting stuck and in the event If you get stuck, a breakaway program is activated. Furthermore, it can be provided that the emergency program provides that the dry run and / or mechanical overload of the Electric motor is switched off for a predefined period of time.

Im Hinblick auf Wartungsfreundlichkeit, Minimierung der Störanfälligkeit und des Herstellungsaufwandes ist es vorteilhaft, wenn die elektronischen Schaltungskreise für die Erzeugung des Steuersignales 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. With regard to ease of maintenance, minimization of susceptibility to faults and manufacturing costs it is advantageous if the electronic circuits for generation the control signal on the one hand and for speed control and error detection on the other are arranged spatially separated, preferably the error detector and the speed controller are integrated in the electric motor pump unit.

Die Erfindung wird anhand des in der Figur gezeigten Blockschaltbildes näher erläutert.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 1 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 receives as a function of the control current 1. 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 (12)

Verfahren zur Steuerung einer Kühlmittelpumpe einer Brennkraftmaschine, wobei die abzuführende Wärmemenge aus zumindest einem Motorbetriebsparameter bestimmt und mittels Pulsweitenmodulation ein Steuersignal für die Solldrehzahl der Kühlmittelpumpe in Abhängigkeit der abzuführenden Wärmemenge erzeugt wird, gekennzeichnet durch folgende Schritte: a) Überprüfen des Signals auf Fehler durch Vergleichen mit einem vordefinierten Sollsignalbereich, b) Durchführen eines Notfallprogrammes für die Kühlmittelpumpe, wenn in Schritt a) ein Fehlwert des Signals festgestellt wurde. c) Regelung der Drehzahl der Kühlmittelpumpe aufgrund des erzeugten Signales für die Solldrehzahl, wenn in Schritt a) kein Fehlwert des Signales festgestellt wurde. 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, using pulse width modulation, characterized by the following steps: a) checking the signal for errors by comparing it with a predefined target signal range, b) Execution of an emergency program for the coolant pump if an incorrect value of the signal was determined in step a). c) Regulation of the speed of the coolant pump based on the generated signal for the target speed, if no error value of the signal was found in step a). Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schritte a) bis c) in vordefinierten Abständen wiederholt werden.A method according to claim 1, characterized in that steps a) to c) are repeated at predefined intervals. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Notfallprogramm vorsieht, daß die Kühlmittelpumpe mit der die höchste Kühlleistung im Dauerbetrieb ermöglichenden Drehzahl betrieben wird.Method according to claim 1 or 2, characterized in that the emergency program provides that the coolant pump is operated at the speed which enables the highest cooling capacity in continuous operation. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Notfallprogramm vorsieht, daß im Falle des Steckenbleibens der Kühlmittelpumpe ein Losbrechprogramm aktiviert wird.Method according to one of claims 1 to 3, characterized in that the emergency program provides that a breakaway program is activated if the coolant pump is stuck. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Notfallprogramm vorsicht, daß bei Trockenlauf und/oder mechanischer Überlastung der Elektromotor für eine vordefinierte Zeitdauer abgeschaltet wird.Method according to Claim 1 or 2, characterized in that the emergency program takes care that the electric motor is switched off for a predefined period of time in the event of dry running and / or mechanical overload. Elektrisch angetriebene Kühlmittelpumpe für eine Brennkraftmaschine, mit einer Elektromotor-Pumpeneinheit (2) und einer elektronischen Steuereinheit (6) zur Erzeugung eines pulsweitenmodulierten Steuersignales (PWM) für die Pumpe in Abhängigkeit zumindest eines Motorbetriebsparameters, dadurch gekennzeichnet, daß die vorzugsweise in das Motormanagement integrierte Steuereinheit (6) mit einem Fehlerdetektor (7) zur Erkennung von abnormen Steuersignalen und Pumpenbetriebszuständen und mit einem Drehzahlregler (4) für die Pumpendrehzahl (n) verbunden ist, wobei der Fehlerdetektor (7) eine Notfallcinrichtung (7b) für die Kühlmittelpumpe aufweist.Electrically driven coolant pump for an internal combustion engine, with an electric motor pump unit (2) and an electronic control unit (6) for generating a pulse-width-modulated control signal (PWM) for the pump as a function of at least one engine operating parameter, characterized in that the control unit , which is preferably integrated in the engine management (6) with an error detector (7) for the detection of abnormal control signals and pump operating states and with a speed controller (4) for the pump speed (n), the error detector (7) having an emergency device (7b) for the coolant pump. Kühlmittelpumpe nach Anspruch 6, dadurch gekennzeichnet, daß der Fehlerdetektor (7) und der Drehzahlregler (4) in die Elektromotor-Pumpeneinheit (2) integriert sind.Coolant pump according to claim 6, characterized in that the error detector (7) and the speed controller (4) are integrated in the electric motor pump unit (2). Kühlmittelpumpe nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Fehlerdetektor (7) mit einem Hall-Sensor (5) am Elektromotor (1) verbunden ist. Coolant pump according to claim 6 or 7, characterized in that the error detector (7) is connected to a Hall sensor (5) on the electric motor (1). Kühlmittelpumpe nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Notfalleinrichtung (7b) eine Kurzschlußschaltung (13) für ein Notsteuersignal des Elektromotors aufweist, um die Kühlmittelpumpe mit der die höchste Kühlleistung im Dauerbetrieb ermöglichenden Drehzahl betreiben zu können.Coolant pump according to one of Claims 6 to 8, characterized in that the emergency device (7b) has a short-circuit circuit (13) for an emergency control signal from the electric motor in order to be able to operate the coolant pump at the speed which enables the highest cooling capacity in continuous operation. Kühlmittelpumpe nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Notfalleinrichtung (7b) eine Abschaltvorrichtung (14) aufweist, die bei Trockenlauf und/oder mechanischer Übersetzung den Elektromotor (1) für eine vordefinierte Zeitdauer abschaltet.Coolant pump according to one of claims 6 to 9, characterized in that the emergency device (7b) has a switch-off device (14) which switches off the electric motor (1) for a predefined period of time in the event of dry running and / or mechanical translation. Kühlmittelpumpe nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, daß die Notfalleinrichtung (7b) eine Losbrechschaltung aufweist, welche bei Steckenbleiben der Kühlmittelpumpe den Elektromotor (1) mit modulierten und/oder oszillierenden Steuersignalen versorgt.Coolant pump according to one of claims 6 to 10, characterized in that the emergency device (7b) has a breakaway circuit which supplies the electric motor (1) with modulated and / or oscillating control signals when the coolant pump gets stuck. Kühlmittelpumpe nach einem der Ansprüche 6 bis 11, dadurch gekennzeichnet, daß der Elektromotor (1) ein synchronlaufender Motor ist.Coolant pump according to one of claims 6 to 11, characterized in that the electric motor (1) is a synchronous 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)

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AT125197 1997-07-23
AT1251/97 1997-07-23
AT125197 1997-07-23

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

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AT (2) ATE227001T1 (en)
DE (1) DE59806097D1 (en)
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DE102006057801B4 (en) * 2006-12-06 2016-12-22 Robert Bosch Gmbh Method and device for diagnosing the functionality of a coolant pump
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Also Published As

Publication number Publication date
ATE227001T1 (en) 2002-11-15
EP0893582A3 (en) 2000-01-05
DE59806097D1 (en) 2002-12-05
US6216645B1 (en) 2001-04-17
AT502321B8 (en) 2007-08-15
ES2183316T3 (en) 2003-03-16
AT502321A1 (en) 2007-02-15
AT502321A8 (en) 2007-08-15
AT502321B1 (en) 2007-06-15
EP0893582B1 (en) 2002-10-30

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