EP3215741A1 - Method and device for operating a speed-controlled fluid pump - Google Patents

Method and device for operating a speed-controlled fluid pump

Info

Publication number
EP3215741A1
EP3215741A1 EP15788049.3A EP15788049A EP3215741A1 EP 3215741 A1 EP3215741 A1 EP 3215741A1 EP 15788049 A EP15788049 A EP 15788049A EP 3215741 A1 EP3215741 A1 EP 3215741A1
Authority
EP
European Patent Office
Prior art keywords
fluid pump
value
drive current
pump
pressure
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
EP15788049.3A
Other languages
German (de)
French (fr)
Other versions
EP3215741B1 (en
Inventor
Rolf Graf
Heiko Jausel
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.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive 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 Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP20200612.8A priority Critical patent/EP3795830B1/en
Priority to EP20200570.8A priority patent/EP3792491B1/en
Publication of EP3215741A1 publication Critical patent/EP3215741A1/en
Application granted granted Critical
Publication of EP3215741B1 publication Critical patent/EP3215741B1/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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F02D2200/0604—Estimation of fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • 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
    • 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
    • F04B2207/00—External parameters
    • F04B2207/03—External temperature
    • 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

Definitions

  • the invention relates to a method and a device for operating a variable-speed fluid pump, in particular ei ⁇ ner fuel pump for a motor vehicle.
  • a sensor for determining a fluid pressure can be dispensed with, in particular a sensor for the fuel pressure. Therefore, there is no direct possibility for the engine control, by a measurement of the fuel pressure and the default values to the electronic pump control on the state of the fuel supply system to close ⁇ and possibly limit excess pressure by ge ⁇ suitable measures.
  • a local monitoring of the fuel system for example, by the control electronics of the fuel pump can address these prob ⁇ lems.
  • the pump current ⁇ as the instantaneous speed of the pump is monitored and then given by regulating the pump current over the speed of the pressure given ⁇ where appropriate.
  • a single maximum pressure is stored, which should not be exceeded.
  • the invention is characterized by a method for Operator Op ben ⁇ a variable speed fluid pump, and a correspondent dierenden device that is appro ⁇ ge for carrying out the method.
  • An electrical drive current for the fluid pump is provided.
  • a maximum value for the drive current is cooperatege ⁇ provides that corresponds to the output side of the fluid pump with a maximum allowable pressure.
  • a threshold value for the Ansteu ⁇ erstrom is provided corresponding output side of the fluid pump with a further maximum ⁇ permeable pressure and which is specified differently depending on at least one boundary condition. The threshold is lower than the maximum value.
  • the fluid pump is activated for a maximum current with the threshold value of the actuation when a presence of the boundary condition was ⁇ telt ermit to limit the pressure on the output side of the fluid pump on egg NEN the constraint intended value.
  • the maximum value relates in the absolute highest allowable pressure for the system in which the speed ⁇ controlled fluid pump is located.
  • the maximum value for the drive current is used as a limiting parameter given ⁇ if to limit the system pressure in extreme cases to the maximum admissible ⁇ gen pressure. This makes it possible, for example, to save a mechanical overpressure valve for system protection.
  • the threshold value By the threshold value, it is possible for certain ⁇ ready for operation conditions which occur in the presence of the boundary conditions, in addition tongues for limiting the maximum value further limitation provided.
  • Dependent relationship of the boundary condition ⁇ as a plurality of constraints, the threshold value is specified which provides a more current limit to limit the system pressure in dependence on the boundary conditions relationship ⁇ as operating conditions to another maximum pressure.
  • the pressure given by the threshold is, is less than or equal to the pressure, which is predetermined by the maximum ⁇ value.
  • the pressure, which is predetermined by the threshold value is smaller than the pressure, which is predetermined by the maximum value.
  • a pressure limitation to pressures below the maximum permissible by the maximum value pressure is possible.
  • a pressure ⁇ limitation to pressures within the regular work area is possible.
  • Various boundary conditions are taken into account. It is possible to put a conventionally provided over ⁇ pressure valve by an intelligent map analysis to it ⁇ .
  • a local pressure relief without pressure sensor is mög ⁇ Lich.
  • a kennfeidgeconstitutede pressure control in the subsystem Flu ⁇ idpumpe and pump electronics is realized.
  • the fluid pump is in particular a fluid pump for a motor vehicle ⁇ .
  • the fluid pump is for example a Kraftstoffpum ⁇ pe of a fuel delivery system of a motor vehicle.
  • the provision of the threshold value comprises activating the fluid pump with the maximum value of the drive current. Subsequently, a minimum pressure on the output side of the fluid pump is determined after a predetermined period of time as a function of a current consumption of the fluid pump. For example, the time interval starts at the start of the
  • a working pressure is determined on the output side of the fluid pump after a further predetermined period of time in Depending ⁇ ness of the current consumption of the fluid pump.
  • the threshold value of the drive current is provided as a function of the determined working pressure. For example, the
  • Threshold set to the determined working pressure.
  • the control current is limited to the determined threshold value. Since ⁇ by the working pressure is limited. Alternatively, the
  • Threshold set to a value calculated from the working pressure.
  • the threshold is set to one Value that is 10% greater or less than the determined working pressure.
  • the threshold value is set unique to the system and example ⁇ example stored in a memory.
  • the boundary condition comprises at least one of: a predetermined pattern of a course of default values of the drive current; a time lapse; a time sequence of signals; an environmental value.
  • the ambient value is in particular an ambient temperature, which is determined, for example, on the circuit board of the pump controller.
  • Fluidtempe- the temperature of the temperature which it is ⁇ averages over the sensor on the control corresponds.
  • the viscosity of the fuel depends on the Tem ⁇ temperature.
  • the viscosity of the fuel also affects the power consumption of the fuel pump.
  • the power consumption is significantly influenced by increasing speeds.
  • the values can pay ⁇ to differences in Pumpenstromaufnähme of about 5 to 8% for small rotation and perform 8 to 18% for higher speeds. In some cases, differences of about 50% are achieved.
  • a possible paraffin separation of diesel fuel is it averages ⁇ by means of the temperature ⁇ turausificat.
  • the pump speed is then temporarily limited and / or a warning is given to the engine control so that it then adapts its behavior and the default value to the fuel pump.
  • the fluid pump is actuated at most with the maximum value after the fluid pump has been driven at the most with the threshold value of the drive current, if a default value for the drive current to a pre-specified value ⁇ changes.
  • a default value for the drive current to a pre-specified value ⁇ changes.
  • the driving of the pump fluid is at most ⁇ with the threshold timited inner ⁇ half of a predetermined period performed.
  • the Schwelwert as the maximum value for the predetermined time is ⁇ span beginning from the start time of the fluid pump set. After that, the maximum value is allowed as the maximum value and the Be ⁇ limitation on the Schwelwert is inactivated.
  • the driving of the fluid pump is performed at most with the threshold value of the drive current only within a predetermined temperature span. Thereforeswei ⁇ se limiting the drive current is used to the threshold value only at low temperatures. At temperatures above the predetermined temperature range or below the predetermined temperature range is limited only to the maximum value ⁇ .
  • the driving of the fluid pump is carried out with the maximum threshold value of the driving current only at pre ⁇ given default values of the driving current. Only in certain areas for the driving current, which is prescribed for example by a motor control or the pump electronics in depen ⁇ dependence of a print request, the advantages of the boundary condition is checked and, if appropriate, the on ⁇ control current is limited to the threshold value are.
  • Figure 1 is a schematic representation of a system according to embodiments and Figure 2 is a schematic representation of a current / speed diagram according to embodiments.
  • FIG. 1 shows a system 100, which in particular is part of a fluid delivery system of a motor vehicle.
  • system 100 is part of a diesel or diesel fuel supply system
  • the sys tem ⁇ 100 comprises a tank 101 to the fuel to spei ⁇ manuals.
  • a fluid pump 102 is provided.
  • the fluid pump 102 is a fuel pump in the embodiment.
  • the fuel pump 102 is provided to deliver the fuel from the tank 101.
  • the fuel pump 102 is a so-called prefeed pump, which can provide pressures of up to 8 bar on an output side 105 of the fuel pump 102.
  • the fuel pump 102 delivers the fuel, for example, to another pump 106, the higher the fuel
  • Pressed for example, up to 500 bar for gasoline and up to 3000 bar for diesel.
  • the fuel pump 102 is electrically connected to a device 103.
  • the device 103 is set up, the
  • the fuel pump 102 is a variable speed pump.
  • the device 103 is for example part of a Pum ⁇ pen Kunststoff réelles.
  • the fuel pump 102 is thus regulated locally and thereby relieving the engine control of the pressure limiting function is possible.
  • the exporting ⁇ approximately device 103 is part of the engine controller or distributed among several control units.
  • the apparatus 103 includes a temperature sensor 104 for He averaging ⁇ ambient temperature.
  • the temperature sensor 104 is provided on the circuit board of the device 103. Thus, the temperature can be evaluated easily and without additional costs due to an additional sensor ⁇ who.
  • FIG. 2 shows a current / speed diagram of the fuel pump 102.
  • the speed of the fuel pump 102 is plotted on the X axis.
  • On the Y axis is the current consumption of the power ⁇ fuel pump 102 is applied.
  • the parameter "speed" of the X-axis can be replaced in pumps with brushed motors according to Aus ⁇ exemplary embodiments by the parameter "pump voltage", especially if no speed determination is made via the Kommutatorstromrippel.
  • the arrow symbolizes ei ⁇ nen increasing system pressure.
  • the current consumption of the fuel ⁇ pump 102 corresponds according to embodiments with the system pressure.
  • a maximum value 201 for the control pressure is given before ⁇ .
  • the maximum value of 201 for the driving diert correspondent if the pump current is monitored so ⁇ as the speed of the fuel pump 102 with a maximum allowable pressure for the system 100, in particular at the output side 105., it is possible by controlling the pump current through the Rotation ⁇ number to limit the actual pressure in the system 100. In particular, the pressure is limited to the limit pressure, which corresponds to the maximum value 201 for the drive current.
  • the phase current or the current consumption of the fluid pump 102 increases with increasing pressure of the fuel.
  • the Variable speed fuel pump 102 is for the speed of a good relationship between the current pump current and the pressure in the system 100. This relationship is represented by the Sys ⁇ temdschreibe 203, 204, 205, 206 and 207.
  • the system pressures 203, 204, 205, 206 and 207 are stored, for example, in a map 200.
  • the speed of the fluid pump 102 is known in the device 103, since it is regulated in particular.
  • the maximum value 201 is ver ⁇ applies in the system 100 as a limiting parameter for limiting the system pressure in extreme cases, to values above the normal working pressures. Although the system pressure may rise above the normal operating pressures, it is limited to an upper limit specified by the maximum value 201 for the drive current. Thus, it is for example mög ⁇ Lich, layers to be galvanized to a mechanical pressure relief valve for system protection.
  • At least one further threshold value 202 is specified, in particular for small systems. According to further embodiments, two or more threshold values 202 are specified.
  • the threshold 202 and the threshold 202 are of different boundary conditions depen ⁇ gig.
  • the threshold value 202 for the drive current is below the maximum value 201 for the drive current.
  • the threshold 202 is in particular also within the Häbe ⁇ Empire.
  • the threshold 202 corresponds to a current limit of the power ⁇ fuel pump 102 depending on one or more Randbedingun ⁇ gen
  • the boundary conditions are especially one or more of:. Pattern of the default value, timing, time sequence of signals, ambient values.
  • the ambient values correspond in particular in particular an ambient temperature of the electronics, which was determined in ⁇ example by means of the temperature sensor 104.
  • the fuel pump 102 in particular ⁇ special according to a default value of the engine control.
  • a request to the fuel pump 102 is detected according to a specific delivery rate.
  • a request is detected in accordance with a maximum delivery rate.
  • the fuel pump 102 is started with the maximum possible control current.
  • a predetermined time after the start is detected, a minimum pressure on the basis of the current consumption of the motor fuel pump ⁇ 102nd
  • the time period is beispielswei ⁇ se 0.2 seconds after the start.
  • the minimum pressure is, for example, 2 bar.
  • a nominal working pressure is detected based on the current consumption of the fuel pump 102.
  • the additional period of time for example, 0.3 Se ⁇ customer after the start.
  • the nominal working pressure Example ⁇ as an average working pressure.
  • the nominal (mean) working pressure is between 4 and 5 bar.
  • the drive current is limited to the determined working pressure.
  • the drive current is limited to a radical derived from the detected working pressure value, ⁇ example, 10% larger or smaller than the working pressure detected.
  • the threshold value 202 is fixed. In particular, the threshold value 202 does not match the maximum value 201 for the extreme overpressure limitation.
  • the default signal that includes default values for the driving ⁇ current is monitored. The limitation of the drive current or the current consumption of the fuel pump 102 to the
  • Threshold 202 is canceled as soon as the default value changes by a certain amount, for example a decrease or increase of 5%.
  • the limitation of the drive current or the current consumption of the fuel pump 102 to the threshold value 202 is deactivated, in particular after a prescribed ne time span has expired.
  • the limitation to the threshold value 202 is activated after a certain period of time after the start in ⁇ . It will only become active again when a minimum ⁇ time, for example, 0.3 seconds back a default value is tektiert de- speaking ent ⁇ a standing fuel pump 102nd
  • a system ⁇ peraturbute component is used. This makes it possible to use the current or pressure limitation only at low temperatures or to adjust the threshold value 202 as a function of the ambient temperature.
  • the evaluation of the temperature allows consideration of the viscosity of the fuel.
  • the viscosity of the fuel also influences the power consumption of the fuel pump 102. Particularly in the case of flow pumps, the power consumption is significantly influenced by increasing rotational speeds.
  • the values for gan ⁇ pendent fuels can result in differences in the Pumpenstrom- intake of about 5 to 8% for low speeds and 8 to 18% lead for higher speeds here. In some cases, differences of about 50% are achieved.
  • the device 103 or the method makes it possible to replace a conventionally provided pressure relief valve by an intelligent evaluation of the characteristic map 200.
  • a local pressure limiting output side of the fuel pump 102 is realized without pressure sensor.
  • a kennfeidgeSysteme Druckbe ⁇ limitation is possible.
  • a pressure limit to pressures within the regular operating range of the fuel pump 102 is possible.
  • a pressure relief is realized at pressures below the norma ⁇ len overpressure stop, that is below the maximum ⁇ value 201.
  • the pressure control is carried out taking into account technicallyster boundary conditions, such as temperature, waveform of the setting signal, time or a combination ⁇ nation of boundary conditions.
  • a time-limited activation of the limitation to pressures within the working range below the threshold ⁇ half 202 is possible.
  • zusharm ⁇ Lich a temperature-dependent activation of the limited loading is possible limitation to pressures within the normal working range of the threshold un ⁇ ter endeavour 202nd
  • zusharm ⁇ Lich a limited by the setting signal activating the limitation to pressures within the working range below the threshold value 202 is possible.
  • the pressure limit within the normal operating range below the threshold value 202 is terminated, for example, depending on specific thresholds of the default value, timeout, temperature or a combination of the mentioned variables.
  • the method is carried out alone in the fuel pump electronics, for example. Alternatively, the method is executed, for example, distributed in the entire system or in the engine control alone.
  • the method minimizes the influence of the viscosity of the motor vehicle and thus increases the accuracy of the pressure limitation.
  • the influences of temperature on the viscosity of the motor vehicle, and indirectly the pressure limit can be minimized and thus the accuracy of the pressure limiting it ⁇ increased. It is also possible to reduce the system cost for the system 100 compared to conventional systems because in particular ⁇ sondere possible to dispense with a pressure sensor and / or a pressure relief valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A method for operating a speed-controlled fluid pump (102) comprises the following steps: - providing an electric control current for the fluid pump (102), - providing a maximum value (201) for the control current, said maximum value corresponding to a maximum permissible pressure on the output side of the fluid pump (102), providing a threshold value (202) for the control current, said threshold value corresponding to an additional maximum permissible pressure on the output side of the fluid pump (102) and being defined depending on at least one boundary condition, the threshold value (202) being lower than the maximum value (201), - controlling the fluid pump (102) with not more than the threshold value (202) of the control current when the boundary condition applies in order to limit the pressure on the output side of the fluid pump (102) to a value provided for the boundary condition.

Description

Beschreibung description
Verfahren und Vorrichtung zum Betreiben einer drehzahlgeregel¬ ten Fluidpumpe Method and apparatus for operating a fluid pump drehzahlgeregel ¬ th
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Betreiben einer drehzahlgeregelten Fluidpumpe, insbesondere ei¬ ner Kraftstoffpumpe für ein Kraftfahrzeug. In Kraftfahrzeugen kann aus Kostengründen auf einen Sensor zur Ermittlung eines Fluiddrucks verzichtet werden, insbesondere auf einen Sensor für den KraftStoffdruck . Daher besteht für die Motorsteuerung keine direkte Möglichkeit, durch eine Messung des KraftStoffdruckes und der Vorgabewerte an die elektronische Pumpensteuerung auf den Zustand des KraftStoff ersorgungssys¬ tems zu schließen und gegebenenfalls einen Überdruck durch ge¬ eignete Maßnahmen zu begrenzen. The invention relates to a method and a device for operating a variable-speed fluid pump, in particular ei ¬ ner fuel pump for a motor vehicle. For reasons of cost, in motor vehicles a sensor for determining a fluid pressure can be dispensed with, in particular a sensor for the fuel pressure. Therefore, there is no direct possibility for the engine control, by a measurement of the fuel pressure and the default values to the electronic pump control on the state of the fuel supply system to close ¬ and possibly limit excess pressure by ge ¬ suitable measures.
Eine lokale Überwachung des KraftStoffSystems beispielsweise durch die Steuerelektronik der Kraftstoffpumpe kann diese Prob¬ leme adressieren. Dabei wird beispielsweise der Pumpenstrom so¬ wie die momentane Drehzahl der Pumpe überwacht und dann durch Regelung des Pumpenstroms über die Drehzahl der Druck gegebe¬ nenfalls begrenzt. Hierzu ist herkömmlich ein einziger Maximal- druck hinterlegt, der nicht überschritten werden soll. A local monitoring of the fuel system, for example, by the control electronics of the fuel pump can address these prob ¬ lems. In this case, for example, the pump current ¬ as the instantaneous speed of the pump is monitored and then given by regulating the pump current over the speed of the pressure given ¬ where appropriate. For this purpose, conventionally, a single maximum pressure is stored, which should not be exceeded.
Es ist eine Aufgabe der Erfindung, ein Verfahren sowie eine Vorrichtung zum Betreiben einer drehzahlgeregelten Fluidpumpe anzugeben, das beziehungsweise die einen verlässlichen Betrieb der Fluidpumpe auch bei unterschiedlichen Umgebungsbedingungen ermöglicht . It is an object of the invention to provide a method and a device for operating a variable-speed fluid pump, which enables reliable operation of the fluid pump even under different environmental conditions.
Die Erfindung zeichnet sich aus durch ein Verfahren zum Betrei¬ ben einer drehzahlgeregelten Fluidpumpe sowie einer korrespon- dierenden Vorrichtung, die zum Ausführen des Verfahrens geeig¬ net ist. The invention is characterized by a method for Operator Op ben ¬ a variable speed fluid pump, and a correspondent dierenden device that is appro ¬ ge for carrying out the method.
Ein elektrischer Ansteuerstrom für die Fluidpumpe wird bereit- gestellt. Ein Maximalwert für den Ansteuerstrom wird bereitge¬ stellt, der mit einem maximal zulässigen Druck ausgangsseitig der Fluidpumpe korrespondiert. Ein Schwellwert für den Ansteu¬ erstrom wird bereitgestellt, der mit einem weiteren maximal zu¬ lässigen Druck ausgangsseitig der Fluidpumpe korrespondiert und der in Abhängigkeit von mindestens einer Randbedingung vorgege¬ ben ist. Der Schwellwert ist niedriger als der Maximalwert. Die Fluidpumpe wird höchstens mit dem Schwellwert des Ansteuer- stroms angesteuert, wenn ein Vorliegen der Randbedingung ermit¬ telt wurde, um den Druck ausgangsseitig der Fluidpumpe auf ei- nen die Randbedingung vorgesehenen Wert zu begrenzen. An electrical drive current for the fluid pump is provided. A maximum value for the drive current is bereitge ¬ provides that corresponds to the output side of the fluid pump with a maximum allowable pressure. A threshold value for the Ansteu ¬ erstrom is provided corresponding output side of the fluid pump with a further maximum ¬ permeable pressure and which is specified differently depending on at least one boundary condition. The threshold is lower than the maximum value. The fluid pump is activated for a maximum current with the threshold value of the actuation when a presence of the boundary condition was ¬ telt ermit to limit the pressure on the output side of the fluid pump on egg NEN the constraint intended value.
Durch das Vorsehen des Maximalwerts und zusätzlich des Schwell¬ werts sind zwei zueinander unterschiedliche maximal zulässige Drücke definiert. Der Maximalwert betrifft dabei den absolut höchsten zulässigen Druck für das System, in dem die drehzahl¬ geregelte Fluidpumpe angeordnet ist. Der Maximalwert für den Ansteuerstrom wird als Grenzparameter verwendet, um gegebenen¬ falls den Systemdruck in Extremfällen auf den maximal zulässi¬ gen Druck zu begrenzen. Dadurch ist es beispielsweise möglich, ein mechanisches Überdruckventil zum Systemschutz einzusparen. By the provision of the maximum value and the additional threshold value ¬ two mutually different maximum allowable pressures are defined. The maximum value relates in the absolute highest allowable pressure for the system in which the speed ¬ controlled fluid pump is located. The maximum value for the drive current is used as a limiting parameter given ¬ if to limit the system pressure in extreme cases to the maximum admissible ¬ gen pressure. This makes it possible, for example, to save a mechanical overpressure valve for system protection.
Durch den Schwellwert ist es möglich, für bestimmte Betriebsbe¬ dingungen, die bei dem Vorliegen der Randbedingungen eintreten, zusätzlich zur Begrenzung auf den Maximalwert weitere Begren- zungen vorzusehen. Abhängig von der Randbedingung beziehungs¬ weise einer Mehrzahl von Randbedingungen wird der Schwellwert vorgegeben, der eine weitere Strombegrenzung vorsieht, um den Systemdruck in Abhängigkeit von den Randbedingungen beziehungs¬ weise Betriebsbedingungen auf einen weiteren maximalen Druck zu begrenzen. Der Druck, der mittels des Schwellwerts vorgegeben ist, ist kleiner oder gleich dem Druck, der durch den Maximal¬ wert vorgegeben ist. Gemäß weiteren Ausführungsformen ist der Druck, der durch den Schwellwert vorgegeben ist, kleiner als der Druck, der durch den Maximalwert vorgegeben ist. By the threshold value, it is possible for certain ¬ ready for operation conditions which occur in the presence of the boundary conditions, in addition tongues for limiting the maximum value further limitation provided. Dependent relationship of the boundary condition ¬ as a plurality of constraints, the threshold value is specified which provides a more current limit to limit the system pressure in dependence on the boundary conditions relationship ¬ as operating conditions to another maximum pressure. The pressure given by the threshold is, is less than or equal to the pressure, which is predetermined by the maximum ¬ value. According to further embodiments, the pressure, which is predetermined by the threshold value, is smaller than the pressure, which is predetermined by the maximum value.
Somit ist eine Druckbegrenzung auf Drücke unterhalb des durch den Maximalwert maximal zulässigen Drucks möglich. Eine Druck¬ begrenzung auf Drücke innerhalb des regulären Arbeitsbereichs ist möglich. Dabei werden verschiedene Randbedingungen berück- sichtigt. Es ist möglich, ein herkömmlich vorgesehenes Über¬ druckventil durch eine intelligente Kennfeldauswertung zu er¬ setzen. Eine lokale Druckbegrenzung ohne Drucksensor ist mög¬ lich. Eine kennfeidgestützte Druckbegrenzung im Subsystem Flu¬ idpumpe und Pumpenelektronik ist realisiert. Thus, a pressure limitation to pressures below the maximum permissible by the maximum value pressure is possible. A pressure ¬ limitation to pressures within the regular work area is possible. Various boundary conditions are taken into account. It is possible to put a conventionally provided over ¬ pressure valve by an intelligent map analysis to it ¬. A local pressure relief without pressure sensor is mög ¬ Lich. A kennfeidgestützte pressure control in the subsystem Flu ¬ idpumpe and pump electronics is realized.
Die Fluidpumpe ist insbesondere eine Fluidpumpe für ein Kraft¬ fahrzeug. Die Fluidpumpe ist beispielsweise eine Kraftstoffpum¬ pe eines KraftStofffördersystems eines Kraftfahrzeugs. Gemäß weiteren Ausführungsformen umfasst das Bereitstellen des Schwellwerts ein Ansteuern der Fluidpumpe mit dem Maximalwert des Ansteuerstroms . Nachfolgend wird ein Minimaldruck ausgangs- seitig der Fluidpumpe nach Ablauf einer vorgegebenen Zeitspanne in Abhängigkeit einer Stromaufnahme der Fluidpumpe ermittelt. Beispielsweise beginnt die Zeitspanne beim Start Zeitpunkt derThe fluid pump is in particular a fluid pump for a motor vehicle ¬. The fluid pump is for example a Kraftstoffpum ¬ pe of a fuel delivery system of a motor vehicle. According to further embodiments, the provision of the threshold value comprises activating the fluid pump with the maximum value of the drive current. Subsequently, a minimum pressure on the output side of the fluid pump is determined after a predetermined period of time as a function of a current consumption of the fluid pump. For example, the time interval starts at the start of the
Fluidpumpe. Ein Arbeitsdruck wird ausgangsseitig der Fluidpumpe nach Ablauf einer weiteren vorgegebenen Zeitspanne in Abhängig¬ keit der Stromaufnahme der Fluidpumpe ermittelt. Der Schwell¬ wert des Ansteuerstroms wird in Abhängigkeit von dem ermittel- ten Arbeitsdruck bereitgestellt. Beispielsweise wird der Fluid pump. A working pressure is determined on the output side of the fluid pump after a further predetermined period of time in Depending ¬ ness of the current consumption of the fluid pump. The threshold value of the drive current is provided as a function of the determined working pressure. For example, the
Schwellwert auf den ermittelten Arbeitsdruck gesetzt. Der An- steuerstrom wird auf den ermittelten Schwellwert begrenzt. Da¬ durch ist der Arbeitsdruck begrenzt. Alternativ wird der Threshold set to the determined working pressure. The control current is limited to the determined threshold value. Since ¬ by the working pressure is limited. Alternatively, the
Schwellwert auf einen Wert gesetzt, der aus dem Arbeitsdruck errechnet wird. Beispielsweise wird der Schwellwert auf einen Wert gesetzt, der 10 % größer oder kleiner als der ermittelte Arbeitsdruck ist. Gemäß weiteren Ausführungsformen wird der Schwellwert einmalig für das System vorgegeben und beispiels¬ weise in einem Speicher hinterlegt. Threshold set to a value calculated from the working pressure. For example, the threshold is set to one Value that is 10% greater or less than the determined working pressure. According to further embodiments, the threshold value is set unique to the system and example ¬ example stored in a memory.
Gemäß Ausführungsformen umfasst die Randbedingung mindestens eines aus: Ein vorgegebenes Muster eines Verlaufs von Vorgabe¬ werten des Ansteuerstroms ; ein Zeitablauf; eine zeitliche Ab¬ folge von Signalen; ein Umgebungswert. Der Umgebungswert ist insbesondere eine Umgebungstemperatur, die beispielsweise an der Platine der Pumpensteuerung ermittelt wird. According to embodiments, the boundary condition comprises at least one of: a predetermined pattern of a course of default values of the drive current; a time lapse; a time sequence of signals; an environmental value. The ambient value is in particular an ambient temperature, which is determined, for example, on the circuit board of the pump controller.
Insbesondere bei sehr niedrigen Temperaturen und beim Erststart des Systems nach längerer Standzeit entspricht die Fluidtempe- ratur der Temperatur, die über den Sensor an der Steuerung er¬ mittelt wird. Die Viskosität des Kraftstoffes ist von der Tem¬ peratur abhängig. Die Viskosität des Kraftstoffes beeinflusst auch die Stromaufnahme der Kraftstoffpumpe. Insbesondere bei Strömungspumpen wird die Stromaufnahme mit steigenden Drehzah- len deutlich beeinflusst. Die Werte können dabei zu Differenzen in der Pumpenstromaufnähme von etwa 5 bis 8 % für kleine Dreh¬ zahlen und 8 bis 18 % für höhere Drehzahlen führen. In manchen Fällen werden auch Differenzen von etwa 50 % erreicht. Durch die Berücksichtigung der Umgebungstemperatur wird die Begren- zung des KraftStoffdrucks über die Begrenzung des Pumpenstroms genauer. Alternativ oder zusätzlich wird mittels der Tempera¬ turauswertung eine mögliche Versulzung von Dieselkraftstoff er¬ mittelt. Beispielsweise wird dann die Pumpendrehzahl kurzzeitig begrenzt und/oder es wird eine Warnung an die Motorsteuerung abgegeben, damit diese dann ihr Verhalten und den Vorgabewert an die Kraftstoffpumpe anpasst. In particular, at very low temperatures and at start up of the system after prolonged exposure Fluidtempe- the temperature of the temperature which it is ¬ averages over the sensor on the control corresponds. The viscosity of the fuel depends on the Tem ¬ temperature. The viscosity of the fuel also affects the power consumption of the fuel pump. Especially with flow pumps, the power consumption is significantly influenced by increasing speeds. The values can pay ¬ to differences in Pumpenstromaufnähme of about 5 to 8% for small rotation and perform 8 to 18% for higher speeds. In some cases, differences of about 50% are achieved. By taking the ambient temperature into account, limiting the fuel pressure by limiting the pump current becomes more accurate. Alternatively or additionally, a possible paraffin separation of diesel fuel is it averages ¬ by means of the temperature ¬ turauswertung. For example, the pump speed is then temporarily limited and / or a warning is given to the engine control so that it then adapts its behavior and the default value to the fuel pump.
Gemäß weiteren Ausführungsformen wird die Fluidpumpe höchstens mit dem Maximalwert angesteuert, nachdem die Fluidpumpe höchs- tens mit dem Schwellwert des Ansteuerstroms angesteuert wurde, wenn sich ein Vorgabewert für den Ansteuerstrom um einen vorge¬ gebenen Wert ändert. Sobald sich der Vorgabewert um den vorge¬ gebenen Wert ändert, beispielsweise um 5 % verringert oder er¬ höht, wird die Begrenzung auf den Schwellwert aufgehoben und ein Ansteuern höchstens mit dem Maximalwert wird erlaubt. According to further embodiments, the fluid pump is actuated at most with the maximum value after the fluid pump has been driven at the most with the threshold value of the drive current, if a default value for the drive current to a pre-specified value ¬ changes. Once the preset value by the pre ¬ passed value changes, for example reduced by 5% or it ¬ höht, the limitation is released to the threshold value and a maximum driving with the maximum value allowed.
Gemäß weiteren Ausführungsformen wird das Ansteuern der Fluid¬ pumpe höchstens mit dem Schwellwert zeitlich limitiert inner¬ halb einer vorgegebenen Zeitspanne durchgeführt. Beispielsweise wird der Schwelwert als Höchstwert für die vorgegebene Zeit¬ spanne beginnend ab dem Start Zeitpunkt der Fluidpumpe gesetzt. Danach wird der Maximalwert als Höchstwert erlaubt und die Be¬ grenzung auf den Schwelwert wird inaktiviert. Alternativ oder zusätzlich wird das Ansteuern der Fluidpumpe höchstens mit dem Schwellwert des Ansteuerstroms nur innerhalb einer vorgegebenen Temperaturspanne durchgeführt. Beispielswei¬ se wird die Begrenzung des Ansteuerstroms auf den Schwellwert nur bei niedrigen Temperaturen verwendet. Bei Temperaturen oberhalb der vorgegebenen Temperaturspanne oder unterhalb der vorgegebenen Temperaturspanne wird lediglich auf den Maximal¬ wert begrenzt. According to further embodiments the driving of the pump fluid is at most ¬ with the threshold timited inner ¬ half of a predetermined period performed. For example, the Schwelwert as the maximum value for the predetermined time is ¬ span beginning from the start time of the fluid pump set. After that, the maximum value is allowed as the maximum value and the Be ¬ limitation on the Schwelwert is inactivated. Alternatively or additionally, the driving of the fluid pump is performed at most with the threshold value of the drive current only within a predetermined temperature span. Beispielswei ¬ se limiting the drive current is used to the threshold value only at low temperatures. At temperatures above the predetermined temperature range or below the predetermined temperature range is limited only to the maximum value ¬.
Alternativ oder zusätzlich wird das Ansteuern der Fluidpumpe höchstens mit dem Schwellwert des Ansteuerstroms nur bei vorge¬ gebenen Vorgabewerten des Ansteuerstroms durchgeführt. Nur in bestimmten Bereichen für den Ansteuerstrom, der beispielsweise durch eine Motorsteuerung oder die Pumpenelektronik in Abhän¬ gigkeit einer Druckanforderung vorgegeben wird, wird das Vor- liegen der Randbedingung überprüft und gegebenenfalls der An¬ steuerstrom auf den Schwellwert begrenzt. Alternatively or additionally, the driving of the fluid pump is carried out with the maximum threshold value of the driving current only at pre ¬ given default values of the driving current. Only in certain areas for the driving current, which is prescribed for example by a motor control or the pump electronics in depen ¬ dependence of a print request, the advantages of the boundary condition is checked and, if appropriate, the on ¬ control current is limited to the threshold value are.
Weitere Vorteile, Merkmale und Weiterbildungen ergeben sich aus den nachfolgenden, in Verbindung mit den Figuren erläuterten Beispielen. Es zeigen: Figur 1 eine schematische Darstellung eines Systems gemäß Ausführungsformen und Figur 2 eine schematische Darstellung eins Strom-/Drehzahl- diagramms gemäß Ausführungsformen. Further advantages, features and developments emerge from the following, explained in conjunction with the figures examples. Show it: Figure 1 is a schematic representation of a system according to embodiments and Figure 2 is a schematic representation of a current / speed diagram according to embodiments.
Figur 1 zeigt ein System 100, das insbesondere Teil eines Flu- idfördersystems eines Kraftfahrzeugs ist. Insbesondere ist das System 100 Teil eines KraftStofffördersystems für Diesel oderFIG. 1 shows a system 100, which in particular is part of a fluid delivery system of a motor vehicle. In particular, system 100 is part of a diesel or diesel fuel supply system
Benzin für einen Verbrennungsmotor des Kraftfahrzeugs. Das Sys¬ tem 100 weist einen Tank 101 auf, um den Kraftstoff zu spei¬ chern. Eine Fluidpumpe 102 ist vorgesehen. Die Fluidpumpe 102 ist im Ausführungsbeispiel eine Kraftstoffpumpe. Die Kraft- stoffpumpe 102 ist vorgesehen, um den Kraftstoff aus dem Tank 101 zu fördern. Insbesondere ist die Kraftstoffpumpe 102 eine sogenannte Vorförderpumpe, die Drücke von bis zu 8 bar an einer Ausgangsseite 105 der Kraftstoffpumpe 102 bereitstellen kann. Die Kraftstoffpumpe 102 fördert den Kraftstoff beispielsweise zu einer weiteren Pumpe 106, die den Kraftstoff mit höherenGasoline for an internal combustion engine of the motor vehicle. The sys tem ¬ 100 comprises a tank 101 to the fuel to spei ¬ manuals. A fluid pump 102 is provided. The fluid pump 102 is a fuel pump in the embodiment. The fuel pump 102 is provided to deliver the fuel from the tank 101. In particular, the fuel pump 102 is a so-called prefeed pump, which can provide pressures of up to 8 bar on an output side 105 of the fuel pump 102. The fuel pump 102 delivers the fuel, for example, to another pump 106, the higher the fuel
Drücken beaufschlagt, beispielsweise bis zu 500 bar bei Benzin und bis zu 3000 bar bei Diesel. Pressed, for example, up to 500 bar for gasoline and up to 3000 bar for diesel.
Die Kraftstoffpumpe 102 ist mit einer Vorrichtung 103 elekt- risch verbunden. Die Vorrichtung 103 ist eingerichtet, dieThe fuel pump 102 is electrically connected to a device 103. The device 103 is set up, the
Kraftstoffpumpe 102 zu steuern beziehungsweise zu regeln. Ins¬ besondere ist die Kraftstoffpumpe 102 eine drehzahlgeregelte Pumpe. Die Vorrichtung 103 ist beispielsweise Teil eines Pum¬ pensteuergeräts. Die Kraftstoffpumpe 102 wird somit lokal gere- gelt und dadurch ist eine Entlastung der Motorsteuerung von der Druckbegrenzungsfunktion ermöglicht. Gemäß weiteren Ausfüh¬ rungsbeispielen ist die Vorrichtung 103 Teil der Motorsteuerung oder auf mehrere Steuergeräte verteilt. Die Vorrichtung 103 weist einen Temperatursensor 104 zur Er¬ mittlung der Umgebungstemperatur auf. Beispielsweise ist der Temperatursensor 104 auf der Leiterplatte der Vorrichtung 103 vorgesehen. Somit kann die Temperatur leicht und ohne zusätzli- che Kosten aufgrund eines zusätzlichen Sensors ausgewertet wer¬ den . Fuel pump 102 to control or regulate. Ins ¬ particular, the fuel pump 102 is a variable speed pump. The device 103 is for example part of a Pum ¬ pensteuergeräts. The fuel pump 102 is thus regulated locally and thereby relieving the engine control of the pressure limiting function is possible. According to further examples, the exporting ¬ approximately device 103 is part of the engine controller or distributed among several control units. The apparatus 103 includes a temperature sensor 104 for He averaging ¬ ambient temperature. For example, the temperature sensor 104 is provided on the circuit board of the device 103. Thus, the temperature can be evaluated easily and without additional costs due to an additional sensor ¬ who.
Figur 2 zeigt ein Strom-/Drehzahldiagramm der Kraftstoffpumpe 102. An der X-Achse ist die Drehzahl der Kraftstoffpumpe 102 aufgetragen. Auf der Y-Achse ist die Stromaufnahme der Kraft¬ stoffpumpe 102 aufgetragen. Der Parameter "Drehzahl" der X- Achse kann bei Pumpen mit bürstenbehafteten Motoren gemäß Aus¬ führungsbeispielen durch den Parameter "Pumpenspannung" ersetzt werden, insbesondere wenn keine Drehzahlbestimmung über den Kommutatorstromrippel gemacht wird. Der Pfeil symbolisiert ei¬ nen zunehmenden Systemdruck. Die Stromaufnahme der Kraftstoff¬ pumpe 102 korrespondiert gemäß Ausführungsbeispielen mit dem Systemdruck. Ein Maximalwert 201 für den Ansteuerdruck ist vor¬ gegeben. Der Maximalwert 201 für den Ansteuerstrom korrespon- diert mit einem maximal zulässigen Druck für das System 100, insbesondere an der Ausgangsseite 105. Wenn der Pumpenstrom so¬ wie die Drehzahl der Kraftstoffpumpe 102 überwacht werden, ist es möglich, durch die Regelung des Pumpenstroms über die Dreh¬ zahl den tatsächlichen Druck im System 100 zu begrenzen. Insbe- sondere wird der Druck auf den Grenzdruck begrenzt, der mit dem Maximalwert 201 für den Ansteuerstrom korrespondiert. FIG. 2 shows a current / speed diagram of the fuel pump 102. The speed of the fuel pump 102 is plotted on the X axis. On the Y axis is the current consumption of the power ¬ fuel pump 102 is applied. The parameter "speed" of the X-axis can be replaced in pumps with brushed motors according to Aus ¬ exemplary embodiments by the parameter "pump voltage", especially if no speed determination is made via the Kommutatorstromrippel. The arrow symbolizes ei ¬ nen increasing system pressure. The current consumption of the fuel ¬ pump 102 corresponds according to embodiments with the system pressure. A maximum value 201 for the control pressure is given before ¬ . The maximum value of 201 for the driving diert correspondent, if the pump current is monitored so ¬ as the speed of the fuel pump 102 with a maximum allowable pressure for the system 100, in particular at the output side 105., it is possible by controlling the pump current through the Rotation ¬ number to limit the actual pressure in the system 100. In particular, the pressure is limited to the limit pressure, which corresponds to the maximum value 201 for the drive current.
Hierbei ist es unerheblich, ob es sich um ein System mit elekt¬ ronisch kommutierten Pumpen oder klassisch mechanisch kommu- tierten Pumpen handelt, bei denen die Drehzahl über den Strom- rippel ermittelt werden kann. Typischerweise werden elektro¬ nisch kommutierte Pumpen eingesetzt. Here, it is irrelevant whether it is a system with elekt ¬ ronisch commutated pump or classical mechanically commutated pumps in which the rotation speed can be determined from the current ripple. Typically, electro nic ¬ commutated pumps.
Der Phasenstrom beziehungsweise die Stromaufnahme der Fluidpum- pe 102 steigt mit steigendem Druck des Kraftstoffs an. Bei der drehzahlgeregelten Kraftstoffpumpe 102 besteht für die Drehzahl ein guter Zusammenhang zwischen dem momentanen Pumpenstrom und dem Druck im System 100. Dieser Zusammenhang ist durch die Sys¬ temdrücke 203, 204, 205, 206 und 207 dargestellt. Die System- drücke 203, 204, 205, 206 und 207 sind beispielsweise in einem Kennfeld 200 hinterlegt. Die Drehzahl der Fluidpumpe 102 ist in der Vorrichtung 103 bekannt, da insbesondere hierauf geregelt wird. Durch Weiterverarbeiten und Verknüpfen der im System 100 vorhandenen Information über den momentanen Phasenstrom bezie- hungsweise die Stromaufnahme ist der Systemdruck ermittelbar. The phase current or the current consumption of the fluid pump 102 increases with increasing pressure of the fuel. In the Variable speed fuel pump 102 is for the speed of a good relationship between the current pump current and the pressure in the system 100. This relationship is represented by the Sys ¬ temdrücke 203, 204, 205, 206 and 207. The system pressures 203, 204, 205, 206 and 207 are stored, for example, in a map 200. The speed of the fluid pump 102 is known in the device 103, since it is regulated in particular. By further processing and linking the information present in the system 100 about the instantaneous phase current or current consumption, the system pressure can be determined.
Der Maximalwert 201 wird im System 100 als Grenzparameter ver¬ wendet, um den Systemdruck im Extremfall auf Werte oberhalb der normalen Arbeitsdrücke zu begrenzen. Der Systemdruck kann zwar über die normalen Arbeitsdrücke steigen, ist jedoch auf einen Wert nach oben begrenzt, der durch den Maximalwert 201 für den Ansteuerstrom vorgegeben ist. Somit ist es beispielsweise mög¬ lich, auf ein mechanisches Überdruckventil zum Systemschutz zu verz ichten . The maximum value 201 is ver ¬ applies in the system 100 as a limiting parameter for limiting the system pressure in extreme cases, to values above the normal working pressures. Although the system pressure may rise above the normal operating pressures, it is limited to an upper limit specified by the maximum value 201 for the drive current. Thus, it is for example mög ¬ Lich, layers to be galvanized to a mechanical pressure relief valve for system protection.
Für bestimmte Betriebsbedingungen wird insbesondere bei kleinen Systemen mindestens ein weiterer Schwellwert 202 vorgegeben. Gemäß weiteren Ausführungsformen werden zwei oder mehr Schwell¬ werte 202 vorgegeben. Der Schwellwert 202 beziehungsweise die Schwellwerte 202 sind von verschiedenen Randbedingungen abhän¬ gig. Der Schwelwert 202 für den Ansteuerstrom liegt unterhalb des Maximalwerts 201 für den Ansteuerstrom. Der Schwellwert 202 liegt jedoch insbesondere auch noch innerhalb des Arbeitsbe¬ reichs . For certain operating conditions, at least one further threshold value 202 is specified, in particular for small systems. According to further embodiments, two or more threshold values 202 are specified. The threshold 202 and the threshold 202 are of different boundary conditions depen ¬ gig. The threshold value 202 for the drive current is below the maximum value 201 for the drive current. However, the threshold 202 is in particular also within the Arbeitsbe ¬ Empire.
Der Schwellwert 202 entspricht einer Strombegrenzung der Kraft¬ stoffpumpe 102 abhängig von einer oder mehreren Randbedingun¬ gen. Die Randbedingungen sind insbesondere eines oder mehrere aus: Muster des Vorgabewerts, Zeitablauf, zeitliche Abfolge von Signalen, Umgebungswerte. Die Umgebungswerte entsprechen insbe- sondere einer Umgebungstemperatur der Elektronik, die bei¬ spielsweise mittels des Temperatursensors 104 ermittelt wurde. The threshold 202 corresponds to a current limit of the power ¬ fuel pump 102 depending on one or more Randbedingun ¬ gen The boundary conditions are especially one or more of:. Pattern of the default value, timing, time sequence of signals, ambient values. The ambient values correspond in particular in particular an ambient temperature of the electronics, which was determined in ¬ example by means of the temperature sensor 104.
Im Folgenden wird ein typischer Ablauf des Verfahrens beispiel- haft angegeben. Zunächst steht die Kraftstoffpumpe 102, insbe¬ sondere entsprechend einem Vorgabewert der Motorsteuerung. Eine Anforderung an die Kraftstoffpumpe 102 wird entsprechend einer bestimmten Förderleistung detektiert. Insbesondere wird eine Anforderung entsprechend einer maximalen Förderleistung detek- tiert. Die Kraftstoffpumpe 102 wird mit maximal möglichem An- steuerstrom gestartet. Eine vorgegebene Zeitspanne nach dem Start wird ein Minimaldruck anhand der Stromaufnahme der Kraft¬ stoffpumpe 102 detektiert. Die Zeitspanne beträgt beispielswei¬ se 0,2 Sekunden nach dem Start. Der Minimaldruck ist beispiels- weise 2 bar. Nach einer weiteren Zeitspanne wird ein nominaler Arbeitsdruck anhand der Stromaufnahme der Kraftstoffpumpe 102 detektiert. Die weitere Zeitspanne ist beispielsweise 0,3 Se¬ kunden nach dem Start. Der nominale Arbeitsdruck ist beispiels¬ weise ein mittlerer Arbeitsdruck. Der nominale (mittlere) Ar- beitsdruck ist beispielsweise zwischen 4 und 5 bar. Der Ansteu- erstrom wird auf den ermittelten Arbeitsdruck begrenzt. Gemäß weiteren Ausführungsformen wird der Ansteuerstrom auf einen vom ermittelten Arbeitsdruck abgeleiteten Wert begrenzt, beispiels¬ weise 10 % größer oder kleiner als der ermittelte Arbeitsdruck. Gemäß weiteren Ausführungsbeispielen ist der Schwellwert 202 fest vorgegeben. Insbesondere stimmt der Schwellwert 202 nicht mit dem Maximalwert 201 für die extreme Überdruckbegrenzung überein. Das Vorgabesignal, das Vorgabewerte für den Ansteuer¬ strom umfasst, wird überwacht. Die Begrenzung des Ansteuer- Stroms oder der Stromaufnahme der Kraftstoffpumpe 102 auf denIn the following, a typical procedure of the method is given by way of example. First, the fuel pump 102, in particular ¬ special according to a default value of the engine control. A request to the fuel pump 102 is detected according to a specific delivery rate. In particular, a request is detected in accordance with a maximum delivery rate. The fuel pump 102 is started with the maximum possible control current. A predetermined time after the start is detected, a minimum pressure on the basis of the current consumption of the motor fuel pump ¬ 102nd The time period is beispielswei ¬ se 0.2 seconds after the start. The minimum pressure is, for example, 2 bar. After a further period of time, a nominal working pressure is detected based on the current consumption of the fuel pump 102. The additional period of time, for example, 0.3 Se ¬ customer after the start. The nominal working pressure Example ¬ as an average working pressure. For example, the nominal (mean) working pressure is between 4 and 5 bar. The drive current is limited to the determined working pressure. In other embodiments, the drive current is limited to a radical derived from the detected working pressure value, ¬ example, 10% larger or smaller than the working pressure detected. According to further embodiments, the threshold value 202 is fixed. In particular, the threshold value 202 does not match the maximum value 201 for the extreme overpressure limitation. The default signal that includes default values for the driving ¬ current is monitored. The limitation of the drive current or the current consumption of the fuel pump 102 to the
Schwellwert 202 wird aufgehoben, sobald sich der Vorgabewert um einen bestimmten Betrag ändert, zum Beispiel eine Verringerung oder eine Erhöhung um 5 %. Die Begrenzung des Ansteuerstroms oder der Stromaufnahme der Kraftstoffpumpe 102 auf den Schwell- wert 202 wird inaktiviert, insbesondere nachdem eine vorgegebe- ne Zeitspanne abgelaufen ist. Die Begrenzung auf den Schwell¬ wert 202 wird nach einer gewissen Zeitdauer nach dem Start in¬ aktiviert. Sie wird erst wieder aktiv, wenn für eine Mindest¬ zeit, beispielsweise 0,3 Sekunden, wieder ein Vorgabewert de- tektiert wird, der einer stehenden Kraftstoffpumpe 102 ent¬ spricht . Threshold 202 is canceled as soon as the default value changes by a certain amount, for example a decrease or increase of 5%. The limitation of the drive current or the current consumption of the fuel pump 102 to the threshold value 202 is deactivated, in particular after a prescribed ne time span has expired. The limitation to the threshold value 202 is activated after a certain period of time after the start in ¬ . It will only become active again when a minimum ¬ time, for example, 0.3 seconds back a default value is tektiert de- speaking ent ¬ a standing fuel pump 102nd
Zusätzlich wird gemäß weiteren Ausführungsbeispielen eine tem¬ peraturabhängige Komponente benutzt. Dadurch ist es möglich, die Strom- beziehungsweise Druckbegrenzung nur bei niedrigen Temperaturen zu verwenden beziehungsweise den Schwellwert 202 in Abhängigkeit von der Umgebungstemperatur anzupassen. Insbe¬ sondere beim ersten Start der Kraftstoffpumpe 102 unter sehr kalten Bedingungen, beispielsweise Kaltstart nach scharfem Frost, ist die Elektroniktemperatur am KraftStoffsensor 104 sehr ähnlich der KraftStofftemperatur . In addition, according to further embodiments, a system ¬ peraturabhängige component is used. This makes it possible to use the current or pressure limitation only at low temperatures or to adjust the threshold value 202 as a function of the ambient temperature. In particular ¬ sondere at the first start of the fuel pump 102 under very cold conditions, such as cold start after a sharp frost, the temperature at the electronic fuel sensor 104 very similar to the fuel temperature.
Die Auswertung der Temperatur ermöglicht eine Berücksichtigung der Viskosität des Kraftstoffs. Die Viskosität des Kraftstoffs beeinflusst auch die Stromaufnahme der Kraftstoffpumpe 102. Insbesondere bei Strömungspumpen wird die Stromaufnahme mit steigenden Drehzahlen deutlich beeinflusst. Die Werte für gän¬ gige Kraftstoffe können hier zu Differenzen in der Pumpenstrom- aufnahme von etwa 5 bis 8 % für kleine Drehzahlen und 8 bis 18 % für höhere Drehzahlen führen. In manchen Fällen werden auch Differenzen von etwa 50 % erreicht. Durch die Berücksichtigung der Temperatur wird die Abhängigkeit der Viskosität des Mediums bei der Begrenzung des KraftStoffdrucks über die Begrenzung des Ansteuerstroms auf den Schwellwert 202 berücksichtigt. Somit wird die Begrenzung des KraftStoffdrucks über die Begrenzung des Ansteuerstroms genauer. The evaluation of the temperature allows consideration of the viscosity of the fuel. The viscosity of the fuel also influences the power consumption of the fuel pump 102. Particularly in the case of flow pumps, the power consumption is significantly influenced by increasing rotational speeds. The values for gan ¬ pendent fuels can result in differences in the Pumpenstrom- intake of about 5 to 8% for low speeds and 8 to 18% lead for higher speeds here. In some cases, differences of about 50% are achieved. By taking into account the temperature, the dependence of the viscosity of the medium in the limitation of the KraftStoffdrucks on the limitation of the drive current to the threshold value 202 is taken into account. Thus, the limitation of KraftStoffdrucks on the limitation of the drive current is more accurate.
Durch die Vorrichtung 103 beziehungsweise das Verfahren wird es möglich, ein herkömmlich vorgesehenes Überdruckventil durch ei- ne intelligente Auswertung des Kennfelds 200 zu ersetzen. Eine lokale Druckbegrenzung ausgangsseitig der Kraftstoffpumpe 102 wird ohne Drucksensor realisiert. Im Subsystem Kraftstoffpumpe 102 und Pumpenelektronik wird eine kennfeidgestützte Druckbe¬ grenzung möglich. Eine Druckbegrenzung auf Drücke innerhalb des regulären Arbeitsbereichs der Kraftstoffpumpe 102 ist möglich. Zudem ist eine Druckbegrenzung auf Drücke unterhalb der norma¬ len Überdruckbegrenzung realisiert, also unterhalb des Maximal¬ werts 201. Die Druckbegrenzung erfolgt unter Berücksichtigung verschiedenster Randbedingungen, beispielsweise Temperatur, Signalverlauf des Vorgabesignals, Zeitablauf oder einer Kombi¬ nation von Randbedingungen. Ein zeitlich limitiertes Aktivieren der Begrenzung auf Drücke innerhalb des Arbeitsbereichs unter¬ halb des Schwellwerts 202 ist möglich. Alternativ oder zusätz¬ lich ist ein temperaturabhängig limitiertes Aktivieren der Be- grenzung auf Drücke innerhalb des normalen Arbeitsbereichs un¬ terhalb des Schwellwerts 202 möglich. Alternativ oder zusätz¬ lich ist ein durch das Vorgabesignal limitiertes Aktivieren der Begrenzung auf Drücke innerhalb des Arbeitsbereichs unterhalb des Schwellwerts 202 möglich. Die Druckbegrenzung innerhalb des normalen Arbeitsbereichs unterhalb des Schwellwerts 202 wird beispielsweise in Abhängigkeit von speziellen Schwellen des Vorgabewerts, Zeitablauf, Temperatur oder einer Kombination der genannten Größen beendet. Das Verfahren wird beispielsweise in der KraftStoffpumpenelektronik alleine ausgeführt. Alternativ wird das Verfahren beispielsweise verteilt im Gesamtsystem oder in der Motorsteuerung alleine ausgeführt. Durch das Verfahren wird der Einfluss der Viskosität des Kraftfahrzeugs minimiert und somit die Genauigkeit der Druckbegrenzung erhöht. Alterna¬ tiv oder zusätzlich werden die Einflüsse der Temperatur auf die Viskosität des Kraftfahrzeugs und indirekt der Druckbegrenzung minimiert und dadurch die Genauigkeit der Druckbegrenzung er¬ höht. Zudem ist es möglich, die Systemkosten für das System 100 im Vergleich zu herkömmlichen Systemen zu reduzieren, da insbe¬ sondere auf einen Drucksensor und/oder ein Überdruckventil ver- ziehtet werden kann. The device 103 or the method makes it possible to replace a conventionally provided pressure relief valve by an intelligent evaluation of the characteristic map 200. A local pressure limiting output side of the fuel pump 102 is realized without pressure sensor. In sub fuel pump 102 and pump electronics a kennfeidgestützte Druckbe ¬ limitation is possible. A pressure limit to pressures within the regular operating range of the fuel pump 102 is possible. In addition, a pressure relief is realized at pressures below the norma ¬ len overpressure stop, that is below the maximum ¬ value 201. The pressure control is carried out taking into account verschiedenster boundary conditions, such as temperature, waveform of the setting signal, time or a combination ¬ nation of boundary conditions. A time-limited activation of the limitation to pressures within the working range below the threshold ¬ half 202 is possible. Alternatively or zusätz ¬ Lich a temperature-dependent activation of the limited loading is possible limitation to pressures within the normal working range of the threshold un ¬ terhalb 202nd Alternatively or zusätz ¬ Lich a limited by the setting signal activating the limitation to pressures within the working range below the threshold value 202 is possible. The pressure limit within the normal operating range below the threshold value 202 is terminated, for example, depending on specific thresholds of the default value, timeout, temperature or a combination of the mentioned variables. The method is carried out alone in the fuel pump electronics, for example. Alternatively, the method is executed, for example, distributed in the entire system or in the engine control alone. The method minimizes the influence of the viscosity of the motor vehicle and thus increases the accuracy of the pressure limitation. Alterna tively ¬ or in addition, the influences of temperature on the viscosity of the motor vehicle, and indirectly the pressure limit can be minimized and thus the accuracy of the pressure limiting it ¬ increased. It is also possible to reduce the system cost for the system 100 compared to conventional systems because in particular ¬ sondere possible to dispense with a pressure sensor and / or a pressure relief valve.

Claims

Patentansprüche claims
Verfahren zum Betreiben einer drehzahlgeregelten Fluidpum- pe (102), umfassend: A method of operating a variable speed fluid pump (102), comprising:
- Bereitstellen eines elektrischen Ansteuerstroms für die Fluidpumpe (102),  Providing an electrical drive current for the fluid pump (102),
- Bereitstellen eines Maximalwerts (201) für den Ansteuer- strom, der mit einem maximal zulässigen Druck ausgangs- seitig der Fluidpumpe (102) korrespondiert,  Providing a maximum value (201) for the drive current which corresponds to a maximum permissible pressure on the output side of the fluid pump (102),
- Bereitstellen eines Schwellwerts (202) für den Ansteuer- strom, der mit einem weiteren maximal zulässigen Druck ausgangsseitig der Fluidpumpe (102) korrespondiert und der in Abhängigkeit von mindestens einer Randbedingung vorgegeben ist, wobei der Schwellwert (202) niedriger als der Maximalwert (201) ist,  Providing a threshold value (202) for the drive current, which corresponds to a further maximum permissible pressure on the output side of the fluid pump (102) and which is predetermined as a function of at least one boundary condition, wherein the threshold value (202) is lower than the maximum value (201 ),
- Ansteuern der Fluidpumpe (102) höchstens mit dem  - Controlling the fluid pump (102) at most with the
Schwellwert (202) des Ansteuerstroms, wenn ein Vorliegen der Randbedingung ermittelt wurde, um den Druck ausgans- seitig der Fluidpumpe (102) auf einen für die Randbedin¬ gung vorgesehenen Wert zu begrenzen. Threshold value (202) of the drive current when a presence of the constraint has been determined in order to limit the pressure side ausgans- the fluid pump (102) to a provided for the Randbedin ¬ supply value.
Verfahren nach Anspruch 1, bei dem das Bereitstellen des Schwellwerts umfasst: The method of claim 1, wherein providing the threshold comprises:
- Ansteuern der Fluidpumpe (102) mit dem Maximalwert (201) des Ansteuerstroms,  Driving the fluid pump (102) with the maximum value (201) of the drive current,
- Ermitteln eines Minimaldrucks ausgangsseitig der Fluid¬ pumpe (102) nach Ablauf einer vorgegebenen Zeitspanne in Abhängigkeit einer Stromaufnahme der Fluidpumpe (102),- determining a minimum pressure downstream of the fluid ¬ pump (102) after a predetermined time period in dependence on a current consumption of the fluid pump (102)
- Ermitteln eines Arbeitsdrucks ausgangsseitig der Fluid¬ pumpe (102) nach Ablauf einer weiteren vorgegebenen Zeitspanne in Abhängigkeit der Stromaufnahme der Fluid¬ pumpe (102) , - determining an operating pressure on the output side of the fluid pump ¬ (102) after a further predetermined time period in dependence on the current consumption of the fluid ¬ pump (102)
- Bereitstellen des Schwellwerts in Abhängigkeit von dem ermittelten Arbeitsdruck. Verfahren nach Anspruch 1 oder 2, bei dem die Randbedin¬ gung mindestens eines umfasst aus: - Providing the threshold value as a function of the determined working pressure. The method of claim 1 or 2, wherein the Randbedin ¬ tion at least one comprises:
- ein vorgegebenes Muster eines Verlaufs von Vorgabewerten des Ansteuerstroms,  a predetermined pattern of a course of default values of the drive current,
- ein Zeitablauf,  - a time lapse,
- eine zeitliche Abfolge von Signalen,  a time sequence of signals,
- ein Umgebungswert, insbesondere eine Umgebungstempera¬ tur . an ambient value , in particular an ambient temperature.
Verfahren nach einem der Ansprüche 1 bis 3, bei dem die Fluidpumpe (102) höchstens mit dem Maximalwert angesteuert wird, nachdem die Fluidpumpe (102) höchstens mit dem Method according to one of claims 1 to 3, wherein the fluid pump (102) is driven at most with the maximum value after the fluid pump (102) at most with the
Schwellwert (202) des Ansteuerstroms angesteuert wurde, wenn sich ein Vorgabewert für den Ansteuerstrom um einen vorgegebenen Wert ändert . Threshold (202) of the drive current was driven when a default value for the drive current changes by a predetermined value.
Verfahren nach einem der Ansprüche 1 bis 4, bei dem das Ansteuern der Fluidpumpe (102) höchstens mit dem Schwell¬ wert (202) des Ansteuerstroms zeitlich limitiert innerhalb einer vorgegebenen Zeitspanne durchgeführt wird. Method according to one of claims 1 to 4, wherein the driving of the fluid pump (102) at most with the Schwell ¬ value (202) of the drive current limited in time within a predetermined period of time is performed.
Verfahren nach einem der Ansprüche 1 bis 5, bei dem das Ansteuern der Fluidpumpe (102) höchstens mit dem Schwell¬ wert (202) des Ansteuerstroms nur innerhalb einer vorgege¬ benen Temperaturspanne durchgeführt wird. Method according to one of claims 1 to 5, wherein the driving of the fluid pump (102) is carried out at most with the Schwell ¬ value (202) of the drive current only within a pregiven ¬ temperature range.
Verfahren nach einem der Ansprüche 1 bis 6, bei dem das Ansteuern der Fluidpumpe (102) höchstens mit dem Schwell¬ wert (202) des Ansteuerstroms nur bei vorgegebenen Vorga¬ bewerten des Ansteuerstroms durchgeführt wird. Method according to one of claims 1 to 6, wherein the driving of the fluid pump (102) is carried out at most with the Schwell ¬ value (202) of the drive current only at predetermined Vorga ¬ rate of Ansteuerstroms.
Vorrichtung zum Betreiben einer drehzahlgeregelten Fluid¬ pumpe, die ausgebildet ist, das Verfahren nach einem der Ansprüche 1 bis 7 auszuführen. Device for operating a variable-speed fluid ¬ pump, which is designed to carry out the method according to one of claims 1 to 7.
EP15788049.3A 2014-11-03 2015-11-02 Method and device for operating a speed-controlled fluid pump Active EP3215741B1 (en)

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EP20200570.8A EP3792491B1 (en) 2014-11-03 2015-11-02 Method and device for operating a speed-controlled fluid pump

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EP20200570.8A Division EP3792491B1 (en) 2014-11-03 2015-11-02 Method and device for operating a speed-controlled fluid pump
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US11867163B2 (en) * 2018-07-30 2024-01-09 Unicla International Limited Electric drive compressor system
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US6998807B2 (en) * 2003-04-25 2006-02-14 Itt Manufacturing Enterprises, Inc. Active sensing and switching device
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US10876526B2 (en) 2020-12-29
EP3792491A1 (en) 2021-03-17
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EP3215741B1 (en) 2021-01-13
WO2016071277A1 (en) 2016-05-12
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US20170314548A1 (en) 2017-11-02
EP3792491B1 (en) 2022-04-06

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