DE102013204725A1 - Method for operating an electric fuel pump - Google Patents

Method for operating an electric fuel pump Download PDF

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Publication number
DE102013204725A1
DE102013204725A1 DE201310204725 DE102013204725A DE102013204725A1 DE 102013204725 A1 DE102013204725 A1 DE 102013204725A1 DE 201310204725 DE201310204725 DE 201310204725 DE 102013204725 A DE102013204725 A DE 102013204725A DE 102013204725 A1 DE102013204725 A1 DE 102013204725A1
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Germany
Prior art keywords
voltage
value
fuel pump
current
maximum limit
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Pending
Application number
DE201310204725
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German (de)
Inventor
Guenter Veit
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Priority to DE102013204235.3 priority Critical
Priority to DE102013204235 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE201310204725 priority patent/DE102013204725A1/en
Publication of DE102013204725A1 publication Critical patent/DE102013204725A1/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/3082Control of electrical fuel pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2048Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit said control involving a limitation, e.g. applying current or voltage limits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2051Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/20Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D2041/224Diagnosis of the fuel system
    • F02D2041/226Fail safe control for fuel injection pump

Abstract

The invention relates to a method for operating an electric fuel pump of an injection system, a maximum limit value (48) being provided for a voltage applied to the electric fuel pump and a maximum limit value (62) for a current flowing through the electric fuel pump at which a value (62) of an electric current required by the electric fuel pump is measured and at which the maximum limit value (48) provided for the voltage applied to the electric fuel pump in the event that the measured value (62) of the current exceeds the intended maximum limit (64), depending on the measured value (62) of the current is reduced.

Description

  • The invention relates to a method and a control device for operating an electric fuel pump.
  • State of the art
  • Functions of an injection system for an internal combustion engine can be controlled by a control unit. For injecting diesel in combustion chambers of an internal combustion engine, a so-called EDC (Electronic Diesel Control) control unit can be used. An output stage of the EDC control unit is usually designed so that the power requirement of an actuator of the injection system can be covered without problems even under unfavorable operating conditions. In addition, a module is provided for monitoring, with which the power amplifier in the event of an error, eg. B. at a short circuit or over temperature, can be switched off.
  • An actuator of the injection system can be designed as an electric fuel pump (EKP), which in normal operation, taking into account all the proposed boundary conditions, only a limited power requirement, but which can increase sharply in exceptional cases. In an exceptional case, z. However, for example, at an increased pressure drop in the fuel filter by exceptionally polluted fuel or by partial Verulzung of the fuel, the power requirement increases sharply. In the case of an FPC (Feed Pump Control) system, a rail pressure of the fuel injection system is controlled by the electric fuel pump (EKP), whereby the electric power pump's power consumption is significantly dependent on an injection point of operation.
  • In such an injection system, which has a fuel storage (common rail), a pressure of the fuel u. a. from the amount of fuel, which is conveyed by a. For example. Designed as a high-pressure pump fuel pump, the pressure of the fuel at the entrance of the fuel pump and a required current for operating the electric fuel pump. However, the voltage at the fuel pump required for one operating point will vary greatly from item to item as well as depending on environmental conditions. An interpretation of the injection system therefore requires a large allowable voltage range for the electric fuel pump, but in an exceptional case, for example. At an increased pressure drop, z. B. at the fuel filter, can lead to a respect to the normal case significantly increased power to the fuel pump. However, a design of the final stage of the electric fuel pump to this maximum possible current within the injection system is relatively expensive compared to a design for the only normally occurring currents.
  • The publication DE 10 2010 030 872 A1 describes a method for determining a correction characteristic curve for adapting a characteristic curve of an injection system, wherein the correction characteristic curve comprises at least one deviation of a measured characteristic curve from a nominal characteristic curve. In this case, the at least one deviation comprises a sum tolerance of at least two components of the injection system, which influence the characteristic curve.
  • Disclosure of the invention
  • Against this background, a method and a control device with the features of the independent claims are presented. Further embodiments of the invention will become apparent from the dependent claims and the description.
  • With the method, it is possible to limit a current level of an electric fuel pump (EKP), which is designed as a component of an injection system, by design of an output stage to a maximum allowable value and thereby to protect the output stage.
  • With the electric fuel pump, a quantity of fuel is conveyed into a fuel accumulator (common rail) of the injection system, wherein the amount u. a. is dependent on a value of a voltage applied to the fuel pump and / or a value of a current flowing through the fuel pump. By the funded amount and the current and / or voltage u. a. Also, a pressure (rail pressure) of the fuel are regulated in the fuel tank. Thus, in an embodiment, the voltage can be used as a manipulated variable for regulating the pressure. Alternatively or additionally, the pressure of the fuel can be regulated by at least one further actuator, for example a pressure regulating valve. For the voltage, a range of values is defined, which is defined by a minimum and maximum limit value for the voltage. An actual value of the voltage at an operating point of the fuel pump is limited in design by a limiting function to the value range.
  • In addition, it is provided that a value of the current flowing through the fuel pump can also be influenced, among other things, by a current value of the pressure of the fuel. This can cause the value of the current to rise as a function of pressure and exceed a maximum limit intended for the current. In this case, the range of values for the voltage, usually the maximum limit for the voltage, becomes Design of the method via a closed loop with a reduction function so long by an amount that may be dependent on the current value of each current measured, reduced until the current value of the current is less than the maximum limit provided for this purpose. Furthermore, the maximum limit value for the voltage can be reduced as a function of a predetermined gradient of the measured voltage over time and thus depending on a temporal change of the voltage.
  • In this case, a voltage applied to the electric fuel pump is limited on the basis of a measured current demanded or required by the electric fuel pump, which flows through the electric fuel pump. Usually, an outgoing value for the voltage from the limiting function is limited to a value range which is defined by a maximum limit value and a minimum limit value. In this case, the value range of the voltage predetermined by the limiting function can be continuously reduced and adjusted precisely to a currently required value range on the basis of the closed loop, with which it is checked whether the measured value of the current is greater than the limit value or not Usually the maximum limit for the voltage is reduced. As a result, a performance of the injection system is maintained within the maximum permitted range. In this case, an availability of the injection system of an internal combustion engine and thus a motor vehicle to be driven thereby can be ensured even in the case of an unexpectedly high pressure drop of fuel in a low-pressure circuit of the injection system.
  • In carrying out the method, the outgoing value for the voltage in an initial state is set by the limiting function to the maximum limit value and thus limited. Furthermore, a reduction function is activated when the current flowing through the electric fuel pump exceeds a predetermined limit, this maximum limit can be determined, for example, by the design of the power amplifier.
  • The reduction function first detects the current value of the voltage. Furthermore, the reduction function is started and the maximum limit value of the voltage from the reduction function starting from this maximum limit value of the voltage on the basis of a predetermined gradient of the voltage over time, usually based on the measured voltage and / or on the basis of already reduced maximum voltage limits, This gradient may also be dependent on the measured value of the current and / or a temporal change of the current.
  • There is also the possibility that short-term exceedances of the limit value for the current, as may occur, for example, in the dynamic operation of the injection system and / or the fuel pump, can be tolerated. In this case, after the current has exceeded the limit, a certain amount of time, which can be measured and / or monitored, for example, by a timer module, is waited before the reduction function is activated. If the currently measured value of the current during this period falls below the limit value, the reduction function is not activated, a timer module for the time period is also stopped and reset.
  • To reduce the value of the voltage u. a. an integrator is activated, which is designed to reduce a maximum limit value of the voltage, based on the current value of the voltage, until the value of the current again reaches the permissible range below the intended limit value. Once this is the case, the integrator is deactivated, setting the voltage range limit to the maximum limit reached. If the value of the current increases at a later time and should be outside the allowable range, the integrator is reactivated and the voltage limit further reduced. In this case, the closed loop is used, which, however, is activated only temporarily, depending on whether the value of the current is within or outside a permissible range.
  • A regulation of the pressure of the fuel in the fuel reservoir (rail) of the injection system, with which a control value for the voltage of the electric fuel pump in the injection system can be specified, remains unrestricted active. However, if a reduced voltage limit is set, an operating range of the fuel injection system and / or the internal combustion engine may be restricted, wherein, for example, an injection quantity of the fuel injection system and / or a torque of the internal combustion engine may be reduced. As a result, deviations of a pressure, i. H. the pressure of the fuel in a fuel tank of the injection system, be avoided. This can be done as an error response by an error message set by the reduction function provided in the method and / or by the voltage limiting function, or independently by a special way of monitoring the rail pressure. If the low pressure range z. B. is manipulated by an adjustable throttle, may result in an implementation of the method that a voltage of the electric fuel pump of the injection system is limited.
  • If, in the low-pressure region of the injection system, the pressure of the fuel increases due to a partial Verulzung of the fuel and / or due to a blockage of a fuel filter and thus increases the power requirement of the electric fuel pump, there is a possibility of implementing the method, the operating point of the electric fuel pump by adjusting usually reduction, to change the voltage and return the power requirement back to a normal operating range. This reduces the flow rate of the electric fuel pump and as a result of the pressure drop in the low pressure region of the injection system, so that the power consumption of the electric fuel pump is reduced and in a permissible value range defined by a maximum limit and possibly by a minimum threshold for the current is, can be returned.
  • Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.
  • It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.
  • Brief description of the drawings
  • 1 shows diagrams for a first embodiment of the presented method.
  • 2 shows a diagram of a second embodiment of the method.
  • 3 shows a schematic representation of an example of an injection system with an electric fuel pump and an embodiment of the presented control unit.
  • Embodiments of the invention
  • The invention is schematically illustrated by means of embodiments in the drawings and will be described in detail below with reference to the drawings.
  • The figures are described in a coherent and comprehensive manner, like reference numerals designate like components.
  • 1 comprises a total of five diagrams, namely a first pressure-time diagram 2 and a second pressure-time diagram 4 , each along an abscissa 6 the time in milliseconds and each along an ordinate 8th a pressure of fuel in an injection system is plotted in bar. Also shows 1 a first current-time diagram 10 and a second current-time diagram 12 , which also each have an abscissa 6 along which the time is plotted in milliseconds. In addition, the two include current-time diagrams 10 . 12 one ordinate each 14 along which a current flowing through an injection pump electric fuel pump is plotted in amperes. In the middle between the first pressure-time diagram 2 and the first current-time diagram 10 left as well as the second pressure-time diagram 4 and the second current-time diagram 12 right is in 1 another diagram 15 pictured, this is an abscissa 16 along which the pressure of the fuel is plotted in bar. Along a first ordinate 18 of the diagram 15 is a flow rate of fuel in liters per hour and along a second ordinate 20 the current flowing through the fuel pump current is plotted in amperes.
  • It is provided in the presented here first embodiment of the method that due to a blockage of a fuel filter in the injection system, as the first pressure-time diagram 2 clarifies a value of the pressure starting from a first operating point 22 , in which there is a pressure of 4.2 bar, within a period of time 24 increases from 50 ms and to a second operating point 26 reached an increased value. This results, like the first current-time diagram 10 shows an increase of the current flowing through the electric fuel pump from the first operating point 22 , in which a current of 7.5 A flows here, to a significantly increased value in the second operating point 26 within the time span 24 of 50 ms, provided that the value of the current in the second operating point 26 is greater than a limit provided for this purpose. A voltage applied to the electric fuel pump has in both operating points 22 . 26 a first duty cycle 27 from 95% up.
  • As a countermeasure for increasing the value of the current above the intended limit value, a permissible maximum limit value of the voltage applied to the electric fuel pump is reduced. In addition, the first duty cycle of the voltage from 95% to a second duty cycle 29 reduced by 85%. This is done on the diagram 15 referenced, the first pressure-dependent course 28 of the current at the first duty cycle 27 of 95% and a second pressure-dependent course 30 of the current at the second duty cycle 29 of 85% shows. For comparison, the diagram shows 15 also a course 32 a constant current of 7.5 A. Due to the reduction of the maximum limit of the voltage, among other things from the reduction of the first duty cycle 27 95% on the second duty cycle 29 of 85% will result also reduces the amount of electricity. This also reduces the delivery rate of fuel delivered by the electric fuel pump and the pressure of the fuel. The diagram 15 shows for this purpose a first pressure-dependent course 34 the flow rate at the first duty cycle 27 of 95% and a second pressure-dependent course 36 the flow rate at the second duty cycle 29 of 85%, with the second pressure-dependent course 36 the flow rate at the second, lower duty cycle 29 85% less than the first pressure-dependent course 34 at the first, higher duty cycle 27 of 95%.
  • The reduction of the duty cycle 27 . 29 The voltage from 95% to 85% in a regulation of the voltage, which is carried out in the context of the process, here also affects the pressure and the current in a third operating point 38 off, at which the second duty cycle 29 of 85%. By reducing the duty cycle 27 . 29 and thus the voltage becomes a value of the second operating point 26 prevailing pressure to a lower value in the third operating point 38 reduced, as the second pressure-time diagram 4 shows. In addition, the increased current in the second operating point 26 again, compared to the lower value of 7.5 A at the third operating point 38 reduced.
  • With the diagram off 2 a structure of the second embodiment of the presented method is shown. The structure of the method represented by the diagram can be implemented as software in a control device for carrying out the method.
  • The proposed structure for carrying out the second embodiment of the proposed method comprises a control function controlled by the control unit 56 that have an in-depth value 42 a voltage applied to an electric fuel pump, to a range of values between a minimum, lower limit 46 and a maximum upper limit 48 limited for the voltage. The two limits 46 . 48 for the value range of the voltage can be specified in an embodiment by a voltage-dependent control (rail pressure control) of a pressure of fuel in a fuel tank (rail) of an injection system. Among other things, the pressure of the fuel in the fuel reservoir depends on an amount of fuel supplied from the electric fuel pump in response to a voltage applied to the electric fuel pump and a current flowing through the electric fuel pump from the electric fuel pump is conveyed to the fuel storage.
  • The limiting function 56 becomes the incoming, currently measured value 42 the voltage supplied via an input signal. It is also used by the limit function 56 an outgoing, resulting value via an output signal 44 provided for the voltage. The outgoing value corresponds to this 44 the voltage to the incoming value 42 the tension as long as the incoming value 42 for the voltage within the prescribed limits 46 . 48 of the value range for the voltage is. The one of the limit function 56 outgoing value provided via the output signal 44 the voltage corresponds to the minimum limit 46 , provided the incoming value 42 the voltage is less than the minimum limit 46 is. Is the incoming value 42 the voltage is greater than the maximum limit 48 , becomes the outgoing value 44 for the voltage of the limiting function 56 to the maximum limit 48 limited.
  • As long as a reduction function is not activated, there is a first switch 59 for switching the voltage in a first position shown here. In this case, a predetermined maximum value 47 for the voltage as the maximum limit 48 the limit function 56 used. A measured value 62 the flow of the electric fuel pump is in a module designed for comparison 70 with a limit 64 compared for the current. Exceeds the measured value 62 the current the limit 64 , becomes a second switch 52 to switch the power switched and a timer module 72 (Timer) started, with the timer module 72 is measured, how long the measured value 62 of the current greater than the limit provided for this purpose 64 is. It monitors whether the measured value 62 of the current longer than a defined period of time greater than the limit value 64 is.
  • From the second switch 52 to switch the current is also a difference 68 between the measured value 62 and the intended limit 64 of electricity, in a module 78 to calculate this difference 68 is formed, to an integrator 54 passed. As long as the measured value 62 greater than the limit 64 for the current, there is a negative difference 68 , In the presence of the negative difference 68 becomes one from an integrator 54 outgoing value 49 to set the maximum limit 48 for the tension by an amount different from the difference 68 and thus from the measured value 62 of the current is greater here than the intended maximum limit 64 is continuously reduced. This amount by which the maximum limit 48 for which voltage is reduced can also be reduced depending on a gradient of the voltage over time. In this case, with the given gradient a temporal course of the measured values of the voltage and / or a time course of During the process already reduced maximum voltage limits are taken into account.
  • If the measured value 62 the current is greater than the limit 64 is after the timer module 72 given time has elapsed, becomes a trigger 74 (Trigger) and thus a third switch 58 for switching the integrator 54 switched as well as an output of a flip-flop module 76 set. By switching the switch 58 becomes the integrator 54 with that of the limit function 56 currently provided, outgoing value 44 initialized once for the voltage. The output of the flip-flop module 76 turns on the first switch 59 to a second position and holds the first switch 59 in this position, that of the integrator 54 provided outgoing value 49 to update the maximum limit 48 the voltage to the limiting function 56 is passed on continuously. As the integrator 54 as already stated, its outgoing value 49 continuously reduced, results in a continuous reduction of the maximum limit 48 for the value range of the voltage and thus also a continuous reduction of the outgoing value 44 for the tension.
  • Now falls below the measured value 62 the current the limit 64 , becomes the output of the module to be compared 70 reset, making the second switch 52 is reset to switch the current to its original position. This will be the input of the integrator 54 set to zero, so that the currently outgoing value 49 of the integrator 54 maintained and not changed further. The maximum limit 48 the limit function 56 is thus on the of the integrator 54 provided, reduced value 49 fixed and thus maintained. Exceeds the measured value 62 the current the limit 64 again, the second switch 52 to switch the current again switched and the negative difference 68 between the measured value 62 and the limit 64 for the current to the input of the integrator 54 passed by the integrator 54 outgoing value 49 to set the limit 48 the tension is further reduced.
  • For the outgoing value 44 the voltage results in the described embodiment of the method that by activation of the reduction function of the integrator 54 beyond its outgoing value 49 updated and / or initialized maximum limit 48 the voltage to the current outgoing value 44 is set. Subsequently, a steady reduction of the maximum limit 48 and concomitantly a reduction of the outgoing value 44 carried out as long as the measured value 62 of the current greater than the limit provided for this purpose 64 is.
  • Regardless, there is usually the possibility that the outgoing value 44 the voltage of the predetermined and / or incoming value 42 for the voltage follows, where the incoming value 42 of the control (rail pressure control) of the pressure of the fuel in a fuel storage of the injection system can be specified and / or can be dependent on an operating point of the injection system, as long as the incoming value 42 within the range of values between the minimum limit 46 and the maximum limit 48 located.
  • 2 also shows a counter 80 who counts how many times the maximum limit 48 for the voltage depending on the measured value 62 of electricity, depending on the difference 68 between the measured value 62 and the intended maximum limit 64 of the current and / or depending on a temporal gradient of the voltage is reduced. At least some of the basis of 2 described modules that are designed to implement the method can be implemented by the presented controller and / or be designed as a component of the controller. This concerns, among other things, the switches 52 . 58 . 59 designed to compare module 70 , the timer module 72 , the module 78 to calculate the difference 68 , the integrator 54 , the trigger 74 , the flip-flop module 76 and the counter 80 , In addition, the control unit can have at least one component for realizing the limiting function 56 and the reduction function.
  • In 3 is an example of an injection system 100 shown schematically for an internal combustion engine of a motor vehicle. This injection system 100 includes as component an electric fuel pump 102 used to pump fuel to a fuel tank 104 (Common Rail) of the injection system 100 is trained. In 3 is still the embodiment of the controller 106 schematically illustrated, which is adapted to a function of at least one component of the injection system 100 , ie at least from the electric fuel pump 102 to control and thus to control and / or regulate. Here, the controller 106 including operating parameters of the electric fuel pump 102 , for example, one on the electric injection pump 102 voltage applied and one through the fuel pump 102 flow, control, usually monitor and / or adjust. In addition, the controller 106 adapted to at least one step of at least one embodiment of the basis of 1 and 2 to perform the procedure presented.
  • In the case of the control unit 106 to be performed method for operating the electric fuel pump 102 the injection system 100 is for a voltage connected to the electric fuel pump 102 is applied, a maximum limit and for a current through the electric fuel pump 102 flows, a maximum limit provided. Furthermore, a value of an electric current required by the electric fuel pump is measured. The maximum limit for the on the electric fuel pump 102 applied voltage is in the event that the measured value of the current exceeds the intended maximum limit, based on the value of the measured current and / or depending on this value is reduced.
  • The proposed maximum limit value for the voltage applied to the electric fuel pump can be reduced in the context of the presented method, depending on a predetermined gradient of the voltage over time. In this case, the gradient of the voltage or a change in the voltage over time can be related to a change over time of the measured voltage and / or to a temporal change of the maximum limit value of the voltage which has already been or will be reduced over time when the method is carried out ,
  • An amount by which the maximum limit value of the voltage is reduced may be dependent on a difference between the measured value of the current and the maximum limit value of the current. It is possible in an embodiment that the amount by which the maximum limit value of the voltage is to be reduced is determined by a function for the magnitude of this voltage, which is the difference between the measured value and the intended maximum value and / or of the provided gradient of the voltage is dependent.
  • In addition, it is possible that the provided maximum limit value for the voltage applied to the electric fuel pump, for example. With a reduction function is reduced continuously or stepwise until the current has exceeded the intended maximum limit or fallen below again.
  • To reduce the voltage limit, there may also be a duty cycle for the voltage applied to the electric fuel pump 102 is present, reduced.
  • In a further embodiment, the for the on the electric fuel pump 102 applied voltage provided maximum limit value for the voltage can be reduced if the predetermined maximum limit value of the current is exceeded at least for a predetermined and / or definable period.
  • In addition, the maximum limit for the voltage applied to the electric fuel pump 102 is reduced to a minimum value when the current falls below the threshold, maintaining the minimum value for the voltage.
  • The control unit 106 for operating and thus controlling the operation of the electric fuel pump 102 and / or the injection system 100 is adapted to that of the electric fuel pump 102 required power with a dedicated Ampèremeter the controller 106 to measure and the maximum limit for the on the electric fuel pump 102 applied voltage is provided, in the event that the current exceeds the intended maximum limit, on the basis of, and consequently depending on the currently measured current and / or the gradient for the voltage to reduce.
  • The control unit 106 may include and / or implement an integrator configured to reduce the maximum voltage limit depending on a difference between a measured value of the current and the intended maximum current limit until the current falls below the allowable maximum limit Has.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102010030872 A1 [0005]

Claims (10)

  1. Method for operating an electric fuel pump ( 102 ) an injection system ( 100 ), wherein for a voltage applied to the electric fuel pump ( 102 ), a maximum limit ( 48 ) and for a current through the electric fuel pump ( 102 ), a maximum limit ( 64 ), in which a value ( 62 ) one of the electric fuel pump ( 102 ) is measured, and in which the maximum limit ( 48 ), which is used for the electric fuel pump ( 102 ) voltage is applied, in the event that the measured value ( 62 ) of the current, the maximum limit ( 64 ), depending on the measured value ( 62 ) of the stream is reduced.
  2. Method according to Claim 1, in which the intended maximum limit value ( 48 ) for the voltage applied to the electric fuel pump ( 102 ) is applied, is reduced depending on a predetermined gradient of the voltage over time.
  3. Method according to Claim 1 or 2, in which the maximum limit value ( 48 ) for the voltage applied to the electric fuel pump ( 102 ), is reduced until the measured value ( 62 ) of the current, the maximum limit ( 64 ) falls below.
  4. Method according to one of the preceding claims, in which the intended maximum limit value ( 48 ) for the voltage applied to the electric fuel pump ( 102 ), is continuously reduced.
  5. Method according to one of the preceding claims, wherein the provided maximum limit for the voltage applied to the electric fuel pump ( 102 ) is applied, is reduced with a reduction function.
  6. Method according to one of the preceding claims, wherein a duty cycle for the voltage applied to the electric fuel pump ( 102 ), is reduced.
  7. Method according to one of the preceding claims, in which the maximum limit value ( 48 ) for the voltage applied to the electric fuel pump ( 102 ) is reduced, if the intended maximum limit value ( 64 ) of the measured value ( 62 ) of the stream is exceeded for at least a predetermined period of time.
  8. Method according to one of the preceding claims, in which the maximum limit value ( 48 ) for the voltage applied to the electric fuel pump ( 102 ) is reduced to a minimum value when the measured value ( 62 ) of the current the maximum limit ( 64 ), while maintaining the minimum value for the voltage.
  9. Control device for operating an electric fuel pump ( 102 ) an injection system ( 100 ), wherein for a voltage applied to the electric fuel pump ( 102 ), a maximum limit ( 48 ) and for a current through the electric fuel pump ( 102 ), a maximum limit ( 64 ) is provided, wherein the control unit ( 106 ) is adapted to one of the electric fuel pump ( 102 ), and the control unit ( 106 ) is designed to set the maximum limit ( 48 ), which is used for the electric fuel pump ( 102 ) voltage is applied, in the event that the measured value ( 62 ) of the current, the maximum limit ( 64 ), depending on the measured value ( 62 ) of the stream.
  10. Control unit according to Claim 9, comprising an integrator ( 54 ), which is adapted to the maximum limit ( 48 ) for the voltage until the measured value ( 62 ) of the current, the maximum allowable limit ( 64 ) has fallen below.
DE201310204725 2013-03-12 2013-03-18 Method for operating an electric fuel pump Pending DE102013204725A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE102013204235.3 2013-03-12
DE102013204235 2013-03-12
DE201310204725 DE102013204725A1 (en) 2013-03-12 2013-03-18 Method for operating an electric fuel pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310204725 DE102013204725A1 (en) 2013-03-12 2013-03-18 Method for operating an electric fuel pump
CN201410087232.5A CN104047731B (en) 2013-03-12 2014-03-11 Method for running electric petrolift

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DE102013204725A1 true DE102013204725A1 (en) 2014-09-18

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