EP3237740B1 - A pump device and a method for supplying fuel for an internal combustion engine and to limit a system pressure - Google Patents
A pump device and a method for supplying fuel for an internal combustion engine and to limit a system pressure Download PDFInfo
- Publication number
- EP3237740B1 EP3237740B1 EP15816432.7A EP15816432A EP3237740B1 EP 3237740 B1 EP3237740 B1 EP 3237740B1 EP 15816432 A EP15816432 A EP 15816432A EP 3237740 B1 EP3237740 B1 EP 3237740B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- delivery device
- system pressure
- electric motor
- control unit
- operating current
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims description 33
- 239000000446 fuel Substances 0.000 title claims description 28
- 238000002485 combustion reaction Methods 0.000 title claims description 10
- 230000001419 dependent effect Effects 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- FNYLWPVRPXGIIP-UHFFFAOYSA-N Triamterene Chemical compound NC1=NC2=NC(N)=NC(N)=C2N=C1C1=CC=CC=C1 FNYLWPVRPXGIIP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- 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
- 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
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
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- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- 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
-
- 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
- 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
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
-
- 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
Definitions
- the invention relates to a conveying device for conveying a medium in a vehicle and for limiting a system pressure of the conveying device, a vehicle, a method, a program element and a computer-readable medium.
- DBV mechanical pressure limiting valve
- the pressure relief valve can be designed as a mechanical component that can either be integrated in the fuel pump or added to the system as a separate component. In normal operation, this component is usually not engaged, but it can increase the system costs and the probability of the system failing.
- the required pressure rise times can require that the pump stage is operated with acceleration ramps of maximum angular acceleration at the current and torque limit of the driving electric motor, which can lead to excessive pressure in the pumped medium.
- the engine control is not yet able to provide a suitable control signal at the first moment of start, since its initialization has not yet been fully completed. If necessary, a high fixed value for the pump speed can be output here, which can then also lead to very high system pressures in the case of small quantities.
- A1 fuel delivery device is known with a first fuel pump which has an electrically driven motor.
- a control unit is connected to the motor of the first fuel pump and is able to determine an estimated pressure based on a current supplied to the motor and the rotational speed of the motor and to control the motor so that the estimated pressure is relatively equal to the target pressure is.
- the U.S. 4,728,264 A describes a pressure-sensitive switch that interrupts the power supply.
- a rail pressure sensor detects too high a pressure during a debounce time. If, after a time counter has elapsed, which begins to run after the failure of a pressure control valve has been detected, an excessively high pressure is detected, an electric fuel pump is switched off.
- a first aspect of the invention relates to a conveying device for conveying a medium in a vehicle and for limiting a system pressure of the conveying device, which has a vehicle pump, an electric motor for driving the vehicle pump and a control unit for controlling the electric motor.
- the vehicle pump is a fuel pump which is designed to deliver fuel for an internal combustion engine of a vehicle.
- the control unit is designed to determine a current speed of the electric motor and a current operating current of the electric motor.
- the control unit is designed to calculate a current system pressure of the conveyor device as a function of the current speed and the current operating current of the electric motor based on a functional relationship between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor.
- control unit is designed to generate a first signal relating to an excess of the system pressure of the delivery device when the current operating current of the electric motor is a predefined one
- the operating current limit value is exceeded, the predefined operating current limit value being dependent on the current speed of the electric motor and, due to the functional relationship, corresponding to the system pressure limit value.
- control unit is designed to limit or reduce the current operating current of the electric motor and / or the current speed of the electric motor when the control unit generates the first signal relating to the system pressure of the delivery device being exceeded.
- the system pressure of the delivery device can be limited without a pressure limiting valve.
- the control unit according to the invention can thus replace the pressure limiting valve. Since the conveying device can thus dispense with a mechanical component, which can have a certain probability of failure, the overall reliability of the conveying device can be increased. Furthermore, by regulating the electric motor, the system pressure can be limited more quickly and independently of specified values, since there is a direct relationship between pressure and operating current. Furthermore, mechanical delays, which can occur due to pressure waves in hydraulic lines, among other things, can be avoided. System pressure overshoots and / or pressure peaks can also be limited more quickly.
- the term "conveying device” can be understood in a broad sense. This means that the components of the conveying device mentioned in detail do not necessarily have to form an entire structural unit.
- the vehicle pump, the electric motor for driving the vehicle pump and the control unit can be different from one another describe separate structural units.
- the control unit for controlling the electric motor can be part of a motor controller.
- different components of the conveyor device together form a structural unit.
- the vehicle pump and the electric motor for driving the vehicle pump can together form a structural unit.
- the control unit for controlling the electric motor can also be a structural unit together with the vehicle pump and the electric motor.
- the vehicle pump can be implemented in different ways.
- the vehicle pump can be a gerotor pump.
- the vehicle pump can be designed as a screw or roller cell pump.
- the vehicle pump can be understood to mean a pump which can be used in the automotive sector.
- the electric motor can be connected to the vehicle pump for conveying the medium, so that it drives the pump.
- the electric motor can be designed as a mechanically commutated or DC motor or as an electrically commutated or EC motor.
- the present invention is applicable to both types of electric motors and also to other electric motors.
- the control unit can determine the current speed of the electric motor.
- electrically commutated electric motors can be speed-regulated.
- the control unit receives the speed of the electric motor from a control unit of the electric motor.
- the control unit for controlling the electric motor and the regulating unit of the electric motor can be the same unit.
- the speed of the electric motor can also be determined separately.
- the speed of the electric motor can take place via the monitoring of current ripples in the electric motor by the control unit.
- the operating current of the electric motor can be understood to mean the current that is used to drive the electric motor.
- this can be understood to mean the current that flows through the windings of the electric motor.
- the operating current of the electric motor can be understood to mean a phase current of the electric motor in the case of EC motors.
- An effective value or a pseudo-effective value can be used as the current operating current of the operating current can be used with a suitable integration time. For example, it can be integrated over an electrical period or a mechanical revolution. With DC motors, a moving average can be used as the current operating current.
- “currently” can be understood to mean that an operating current is being used at the time of the determination. This does not rule out that the operating current is an average value or an effective value or pseudo-effective value that can be defined over a certain period of time.
- a current variable can be understood to mean a momentary variable, whereby it is not excluded that the variable is a variable determined in a specific period of time.
- the variable can be, for example, an operating current, a speed, a system pressure or another variable.
- the feature “currently” or “currently” need not be interpreted narrowly in this context.
- the control unit can therefore be designed to compare the determined current operating current of the electric motor with a predefined operating current limit value.
- This operating current limit value can be stored, for example, in a corresponding characteristic map of the control unit.
- the predefined operating current limit value can also be understood to mean a predefined operating current limit value.
- This operating current limit value can, for example, be permanently stored in the control unit or in a memory unit which the control unit can access.
- the predefined operating current limit value can be an operating current limit value curve. That is to say, the operating current limit value can comprise several points on an operating current limit value curve.
- the predefined operating current limit value can thus be used for different The speeds of the electric motor can be different.
- the operating current limit value can also depend on other parameters, e.g. B. from the voltage of the electric motor.
- a functional relationship can exist between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor.
- the system pressure can denote, for example, the pressure of the medium in the vehicle pump and / or in the supply or discharge lines of the vehicle pump.
- the curve, which is described by the operating current limit value dependent on the current speed of the electric motor, can describe a line of constant pressure or an isobar.
- the operating current limit value can define a system pressure limit value.
- the control unit can be designed to compare the current operating current with the predefined operating current limit value for the current speed. For example, the control unit can be designed to read out a characteristic field in which the operating current limit value for the current speed is stored and to compare this value with the current operating current.
- the control unit If the current operating current exceeds the current operating current limit value, the control unit generates the first signal relating to the operating current being exceeded.
- This first signal can be sent, for example, to a control unit of the electric motor and / or to a motor controller.
- this first signal can lead to the electric motor being regulated in such a way that the system pressure in the delivery device drops again. In this way, the system pressure of the pump can be monitored and controlled by monitoring the operating current and the speed of the electric motor.
- control unit It does not have to be necessary for the control unit to first calculate a system pressure in order to determine whether the system pressure is exceeded to recognize. Furthermore, the control unit can further parameters such. B. use the temperature of the fuel to determine if the system pressure is exceeded.
- control unit is designed to generate the first signal relating to the system pressure of the delivery device being exceeded if the calculated current system pressure of the delivery device exceeds a predefined system pressure limit value.
- the functional relationship can be understood, for example, as a formula with which the system pressure of the delivery device can be calculated as a function of the operating current of the electric motor and the speed of the electric motor.
- This formula can be stored, for example, in the control unit or in a memory unit which the control unit can access.
- the functional relationship can also be defined in the form of a curve or in the form of several points. For example, a plurality of points of a system pressure limit value curve which describe a curve according to the functional relationship can be stored on the control unit and / or on the memory unit.
- control unit can determine which system pressure prevails in the delivery device. Furthermore, the control unit can be configured at which system pressure the first signal relating to the system pressure being exceeded by the delivery device is generated. For example, the control unit can also receive a new or changed system pressure limit value from another unit Exceed the first signal to be generated.
- system pressures or working pressures for modern fuel systems can be in a range from approximately 2 to 7 bar.
- the system pressure limit can be in a range from 5 to 8 bar.
- the critical system pressure limit value can be in a range from 7 to 8 or in a range from 7 to 9 bar.
- a pump-specific course of the operating current as a function of the speed at a given pressure is stored in the control unit of the delivery device.
- a curve of constant pressure or an isobar can be stored in the control unit.
- a plurality of pump-specific courses of the operating current as a function of the speed for different pressures can be stored in the control unit of the delivery device.
- control unit can determine whether the determined combination of current operating current and current speed is positioned above, below or on the curve of the pump-specific course of the operating current.
- the control unit can thus determine in a simple manner whether the system pressure limit value is exceeded or not reached.
- control unit is designed to limit or reduce the current operating current of the electric motor and / or the current speed of the electric motor when the control unit generates the first signal relating to the system pressure being exceeded by the delivery device.
- control unit can be designed to adapt the operation of the electric motor in such a way that the system pressure the conveyor is limited or lowered.
- control unit sends a signal to a control unit of the electric motor to limit or reduce the operating current and / or the speed.
- the control unit can then limit or reduce the operating current and / or the speed.
- the control unit can counteract the excess of the system pressure of the delivery device and control the electric motor in such a way that the system pressure is again below the predefined system pressure limit value.
- control unit is designed to generate a second signal relating to a critical system pressure excess of the delivery device if the calculated current system pressure of the delivery device exceeds a predefined critical system pressure limit value. Furthermore, the control unit is designed to switch off the delivery device when the control unit generates the second signal relating to the critical system pressure being exceeded by the delivery device and the system pressure of the delivery device exceeds the critical system pressure limit value during a predefined period of time.
- a second system pressure limit value namely the critical system pressure limit value
- This critical system pressure limit value can be higher than the system pressure limit value. For example, it may be necessary for the system pressure of the delivery device to be quickly limited when the critical system pressure limit value is exceeded. If this critical system pressure limit value is not undershot during the predefined period, the control unit can be designed to switch off the delivery device. In this way, damage to the conveyor device or other components can be prevented, which by a the critical system pressure limit may be exceeded for too long. In other words, the control unit can be designed to carry out an emergency shutdown of the delivery device if the critical system pressure limit value is exceeded for too long.
- the feature "too long" can mean that the critical system pressure limit value is exceeded for longer than the predefined period of time.
- Another aspect of the invention relates to a vehicle with a delivery device described in the context of the present invention, the vehicle pump of the delivery device being a fuel pump for delivering fuel for an internal combustion engine of the vehicle.
- the vehicle can be, for example, a motor vehicle or a truck that is driven by the internal combustion engine. Furthermore, the vehicle can also be equipped with a hybrid drive. Furthermore, the features and advantages mentioned in connection with the conveying device can also be applied to the vehicle. Furthermore, the vehicle can also have been retrofitted with a control unit which controls the electric motor of the conveying device according to the invention.
- Another aspect of the invention relates to a method for conveying a medium and for limiting a system pressure of a conveying device which has a vehicle pump driven by an electric motor.
- the method has the step of monitoring a current speed and a current operating current of the electric motor. Furthermore, the method has the step of generating a first signal relating to an excess of the system pressure of the delivery device when the current operating current of the electric motor exceeds a predefined operating current limit value.
- the predefined operating current limit value is dependent on the current speed of the electric motor.
- the steps of the process can be different Sequences and / or take place in parallel.
- This method can also be carried out by a control unit of a conveyor device described in the context of this invention.
- the features that are mentioned in connection with the conveyor device described can also be applied to methods that are described above and below.
- the method furthermore has the step of calculating a current system pressure of the delivery device as a function of the current speed and the current operating current of the electric motor based on a functional relationship between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor on.
- the method further includes the step of generating the first signal relating to the system pressure being exceeded by the delivery device if the calculated current system pressure of the vehicle pump exceeds a predefined system pressure limit value.
- Another aspect of the invention relates to a program element which, when executed on a processor, instructs the processor to execute a method described in the context of the present invention.
- the program element can be loaded onto a control unit of a conveying device that executes the steps of the method.
- the program element can also be part of a computer program.
- the program element can itself be an independent computer program.
- the program element can enable an already existing computer program to carry out the method according to the invention. Since the program element is designed to instruct the processor to execute a method described in the context of this invention, the advantages and features mentioned in connection with the method also apply to the program element.
- Another aspect of the invention relates to a computer-readable medium on which a program element is stored which, when it is executed on a processor, instructs the processor to execute a method described in the context of the present invention.
- the computer-readable medium can be viewed as a storage medium, for example a USB stick, CD, DVD, hard drive or other storage medium. Furthermore, the computer-readable medium can also be designed as a microchip, which enables a control unit to carry out the method according to the invention.
- the described embodiments relate equally to a conveyor device, a vehicle, a method, a program element and a computer-readable medium, although individual embodiments are described exclusively in relation to the conveyor device, the vehicle, the method, the program element or the computer-readable medium. Synergetic effects can result from various combinations of the embodiments, even if these are not described below.
- a conveying device 100 for conveying a medium in a vehicle and for limiting a system pressure of the conveying device.
- the delivery device has a vehicle pump 101, an electric motor 102 for driving the vehicle pump 101 and a control unit 103 for controlling the electric motor 102, which comprises a stator 110 and a rotor 111.
- the control unit is designed to determine a current speed of the electric motor 102 and a current operating current of the electric motor 102.
- the control unit is designed to generate a first signal relating to a system pressure excess of the delivery device 100 when the current operating current of the electric motor 102 exceeds a predefined operating current limit value, the predefined operating current limit value being dependent on the current speed of the electric motor 102.
- the vehicle pump 101 is designed as a gerotor pump or as a gerotor pump.
- the driving gear 104 runs eccentrically in the internal toothing 105 of the vehicle pump 101.
- the gear 104 is driven by the electric motor 102.
- the medium is transported between the tooth gaps, as a result of which the medium is transported from an inlet 106 of the pump 101 to an outlet 107 of the pump 101 in the direction of the arrow 108.
- the gerotor pump is purely exemplary and not to be considered limiting.
- the invention can be implemented for many different types of pumps.
- the control unit 103 is designed to carry out a method for limiting the system pressure of the vehicle pump 101.
- the method has the step of determining the speed of the vehicle pump 101. If the electric motor 102 of the vehicle pump 101 is designed as an electrically commutated electric motor, the speed can be a known value, since electrically commutated electric motors can typically be speed-regulated. In the case of mechanically commutated electric motors, the speed can optionally be determined separately via current ripple, because in previous systems typically no speed control has to be implemented.
- the method further includes determining the phase current of the electric motor 102.
- a value that represents the speed of the vehicle pump 101 and a value that represents the phase current of the vehicle pump 101 are fed to an evaluation unit.
- This evaluation unit can be part of the control unit 103, for example.
- the evaluation unit can also be a further component of the conveying device 100, which is shown in FIG Fig. 1 is not shown for the sake of clarity.
- the method also includes the step of determining the current pressure generated by the fuel pump 101 in the evaluation unit.
- the current pressure is compared with a first pressure limit value and a signal is generated when the first pressure limit value is exceeded.
- the first pressure limit value can correspond to the operating pressure limit value.
- control unit 103 can be designed to allow further measures to follow when the signal is generated when the first pressure limit value is exceeded.
- the control unit can regulate the system pressure to a specific default value in typical normal operation by changing the current operating current of the Electric motor 102 is regulated to a speed-dependent current value, which is stored in a map.
- the control unit 103 can be communicated with a pressure setpoint value from a higher-level control of the internal combustion engine, which is to be achieved by regulating the operating current.
- the control unit can exhibit a typical behavior pattern in faulty operation.
- such a behavior pattern can be called up when no more fuel is consumed and the required first pressure limit value can no longer be complied with in the case of very low consumption quantities, because, for example, the speed cannot fall below a minimum speed.
- the control unit 103 can attempt to limit the system pressure of the vehicle pump 101 to a specific value below the first pressure limit value by limiting the current to a speed-dependent value in accordance with a characteristic map. Furthermore, the speed of the electric motor 102 or a combination of speed and operating current can be limited.
- the control unit can generate a second signal.
- the second pressure limit value can correspond to the critical system pressure limit value, for example.
- the control unit can attempt to reduce the system pressure of the vehicle pump 101 to a specific value below the second pressure limit value by limiting the current to a speed-dependent value according to a characteristic map or by limiting the speed or by a combination of both. Furthermore, the control unit can also be designed to switch off the delivery device 100 or the pump 101 directly if the second pressure limit value could not be limited for a certain time. This serves to protect the system so that, for example, major damage can be avoided. Furthermore, the control unit can also be designed to generate a warning message, which is sent to the engine controller, for example, that the pump has been switched off. The engine control can then take appropriate measures. If necessary, the control unit 103 can allow the conveyor device 100 to be restarted, during which a further start-up active control signal with the information "Pump active" or with a valid pressure or speed preset value is defined.
- a computer-readable medium 109 is shown, on which, for example, the method which is carried out by the control unit 103 is stored. Furthermore, a functional relationship between the operating current of the electric motor 102, the speed of the electric motor 102 and the system pressure of the vehicle pump 101 can also be stored on the computer-readable medium.
- Fig. 2 is shown a diagram according to an embodiment of the invention.
- This diagram contains a first axis 201, which designates the speed of the electric motor, and a second axis 202, which represents the operating current or the energy consumption of the electric motor 102.
- the first axis 201 can alternatively also designate the pump voltage. For example, with mechanically commutated electric motors, it may not be possible to determine the speed directly.
- the units are in the Fig. 2 not specifically specified.
- the unit of axis 201 is revolutions per minute and the unit of axis 202 is amperes.
- curves 205, 206, 207, 208 and 209 are shown in the diagram, which represent the current consumption of the electric motor as a function of the speed.
- the curve 205 corresponds to a pump-specific course of the operating current for different speeds at a constant system pressure of the vehicle pump P0.
- the curve 206 shows the pump-specific course of the operating current at a constant pressure P1, the curve 207 at a constant pressure P2, the curve 208 at a constant pressure P3 and the curve 209 at a constant pressure P4.
- the pressures P0 to P4 are named in ascending order, that is, the pressure P0 is smaller than the pressure P1, the pressure P1 is smaller than the pressure P2, the pressure P2 is smaller than the pressure P3 and the pressure P3 is smaller than the pressure P4, which is also shown by the arrow 210.
- Fig. 2 System pressure limit curves 203 and 204 are shown. So is in Fig. 2 It can be seen that curves 204 and 203 are dependent on the speed shown in axis 201. Curve 203 corresponds to the predefined system pressure limit value and curve 204 corresponds to the critical system pressure limit value.
- the control unit 103 is designed to determine the speed and the operating current of the electric motor 102. If the combination of the determined speed and the determined operating current results in a point that is located in diagram 200 below curve 203, the system pressure limit value is not exceeded if the point resulting from the determined speed and determined operating current is between the curves 203 and 204, the system pressure limit value has been exceeded and the critical system pressure limit value has been fallen below, so that the control unit 103 generates the first signal. If the point resulting from the determined speed and determined operating current is arranged above curve 204, the system pressure limit value and the critical system pressure limit value have been exceeded, so that the second signal is also generated.
- the system pressure limit values or system pressure limit value curves 203 and 204 can be stored on the control unit 103. Furthermore, only one of the system pressure limit value curves 203 or 204 can also be stored on the control unit. In this case, data or points which define the system pressure limit values or system pressure limit value curves 203 and 204 can also be stored on the control unit 103.
- Fig. 3 shows a vehicle 300 according to an embodiment of the invention.
- the vehicle has an internal combustion engine 301, a fuel tank 302 and a delivery device 100, which is described in the context of the present invention, which supplies the internal combustion engine 301 with fuel from the fuel tank 302.
- the conveying device 100 includes a pump 101, an electric motor 102 and a control unit 103.
- the control unit can be part of the motor control or can also be retrofitted to improve the reliability of the Improve conveyor device 100.
- Fig. 4 a flowchart of a method for conveying a medium and for limiting a system pressure of a conveying device having a vehicle pump driven by an electric motor is shown.
- the method includes the steps of monitoring a current speed and a current operating current of the electric motor S1 and generating a first signal relating to a system pressure excess of the delivery device when the current operating current of the electric motor exceeds a predefined operating current limit value S2.
- the predefined operating current limit value is dependent on the current speed of the electric motor.
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Description
Die Erfindung betrifft eine Fördervorrichtung zum Befördern eines Mediums in einem Fahrzeug und zum Begrenzen eines Systemdrucks der Fördervorrichtung, ein Fahrzeug, ein Verfahren, ein Programmelement und ein computerlesbares Medium.The invention relates to a conveying device for conveying a medium in a vehicle and for limiting a system pressure of the conveying device, a vehicle, a method, a program element and a computer-readable medium.
Üblicherweise können Kraftstoffsysteme von Kraftfahrzeugen ein mechanisches Druckbegrenzungsventil (DBV) zur Druckbegrenzung aufweisen, das bei Überschreiten eines bestimmten Kraftstoffdrucks öffnet und so einen weiteren Druckanstieg im System verhindert. Das Druckbegrenzungsventil kann als eine mechanische Komponente ausgeführt sein, die entweder in der Kraftstoffpumpe integriert sein kann, oder als separates Bauteil dem System hinzugefügt werden kann. Im Normalbetrieb ist üblicherweise dieses Bauteil nicht im Eingriff, kann aber die Systemkosten und die Ausfallwahrscheinlichkeit des Systems erhöhen.Usually, fuel systems of motor vehicles can have a mechanical pressure limiting valve (DBV) for pressure limiting, which opens when a certain fuel pressure is exceeded and thus prevents a further pressure increase in the system. The pressure relief valve can be designed as a mechanical component that can either be integrated in the fuel pump or added to the system as a separate component. In normal operation, this component is usually not engaged, but it can increase the system costs and the probability of the system failing.
Weiter kann die Möglichkeit bestehen, dass moderne Kraftfahrzeuge aus Kostengründen nicht mit einem Sensor zum Messen eines Kraftstoffdrucks ausgestattet werden. Daher kann es sein, dass für die Motorsteuerung keine direkte Möglichkeit besteht, durch eine Messung des Kraftstoffdrucks und der Vorgabewerte an die elektronische Pumpensteuerung auf den Zustand des Kraftstoffversorgungssystems zu schließen und gegebenenfalls einen Überdruck durch geeignete Maßnahmen zu begrenzen. Außerdem kann in modernen Fahrzeugen die Problematik bestehen, dass das Kraftstoffsystem sehr schnell unter Druck gesetzt werden muss, um einen raschen Start der Brennkraftmaschine durchzuführen, um praktisch vom ersten Moment an die Abgaswerte entsprechend den gesetzlichen Vorgaben einzuhalten. Die typisch geforderten Werte für die Druckanstiegszeiten in solchen Systemen können bei 100 ms bis 300 ms für einen Druckanstieg von einem Systemdruck 0 auf einen Systemdruck von etwa 4 - 6 bar liegen. Die geforderten Druckanstiegszeiten können erfordern, dass die Pumpstufe mit Beschleunigungsrampen maximaler Winkelbeschleunigung an der Strom- und Drehmomentgrenze des antreibenden Elektromotors betrieben wird, was zu Überschwüngen des Druckes im geförderten Medium führen kann. Außerdem kann es sein, dass bei gewissen Fahrzeugen die Motorsteuerung im ersten Moment des Starts noch kein geeignetes Steuersignal bereitstellen kann, da deren Initialisierung noch nicht vollständig abgeschlossen ist. Hier kann gegebenenfalls ein hoher Festwert für die Pumpendrehzahl ausgegeben werden, der dann bei kleiner Abnahmemenge ebenfalls zu sehr hohen Systemdrücken führen kann.Furthermore, there may be the possibility that modern motor vehicles are not equipped with a sensor for measuring a fuel pressure for reasons of cost. It may therefore be that there is no direct possibility for the engine control to infer the state of the fuel supply system by measuring the fuel pressure and the default values to the electronic pump control and, if necessary, to limit excess pressure by means of suitable measures. In addition, in modern vehicles there can be the problem that the fuel system has to be pressurized very quickly in order to start the internal combustion engine quickly so that the exhaust gas values correspond to the exhaust gas values practically from the first moment comply with legal requirements. The typically required values for the pressure rise times in such systems can be 100 ms to 300 ms for a pressure rise from a system pressure of 0 to a system pressure of around 4-6 bar. The required pressure rise times can require that the pump stage is operated with acceleration ramps of maximum angular acceleration at the current and torque limit of the driving electric motor, which can lead to excessive pressure in the pumped medium. In addition, it may be the case that in certain vehicles the engine control is not yet able to provide a suitable control signal at the first moment of start, since its initialization has not yet been fully completed. If necessary, a high fixed value for the pump speed can be output here, which can then also lead to very high system pressures in the case of small quantities.
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Es kann als Aufgabe der Erfindung angesehen werden, die Zuverlässigkeit von Fördervorrichtungen für Fahrzeuge zu erhöhen.It can be seen as the object of the invention to increase the reliability of conveyor devices for vehicles.
Diese Aufgabe wird gelöst durch die Gegenstände der unabhängigen Ansprüche. Weiterbildungen und Ausführungsformen sind der folgenden Beschreibung, den Figuren und den abhängigen Ansprüchen zu entnehmen.This object is achieved by the subjects of the independent claims. Further developments and embodiments can be found in the following description, the figures and the dependent claims.
Ein erster Aspekt der Erfindung betrifft eine Fördervorrichtung zum Befördern eines Mediums in einem Fahrzeug und zum Begrenzen eines Systemdrucks der Fördervorrichtung, welche eine Fahrzeugpumpe, einen Elektromotor zum Antreiben der Fahrzeugpumpe und eine Steuereinheit zum Steuern des Elektromotors aufweist. Die Fahrzeugpumpe ist eine Kraftstoffpumpe, welche zum Befördern von Kraftstoff für einen Verbrennungsmotor eines Fahrzeugs ausgeführt ist. Die Steuereinheit ist ausgeführt, eine aktuelle Drehzahl des Elektromotors und einen aktuellen Betriebsstrom des Elektromotors zu ermitteln.
Gemäß der Erfindung ist die Steuereinheit ausgeführt, basierend auf einem funktionellen Zusammenhang zwischen dem Systemdruck der Fördervorrichtung, dem Betriebsstrom des Elektromotors und der Drehzahl des Elektromotors einen aktuellen Systemdruck der Fördervorrichtung in Abhängigkeit der aktuellen Drehzahl und des aktuellen Betriebsstroms des Elektromotors zu berechnen.A first aspect of the invention relates to a conveying device for conveying a medium in a vehicle and for limiting a system pressure of the conveying device, which has a vehicle pump, an electric motor for driving the vehicle pump and a control unit for controlling the electric motor. The vehicle pump is a fuel pump which is designed to deliver fuel for an internal combustion engine of a vehicle. The control unit is designed to determine a current speed of the electric motor and a current operating current of the electric motor.
According to the invention, the control unit is designed to calculate a current system pressure of the conveyor device as a function of the current speed and the current operating current of the electric motor based on a functional relationship between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor.
Ferner ist die Steuereinheit ausgeführt, ein erstes Signal bezüglich einer Systemdrucküberschreitung der Fördervorrichtung zu erzeugen, wenn der aktuelle Betriebsstrom des Elektromotors einen vordefiniertenFurthermore, the control unit is designed to generate a first signal relating to an excess of the system pressure of the delivery device when the current operating current of the electric motor is a predefined one
Betriebsstromgrenzwert überschreitet, wobei der vordefinierte Betriebsstromgrenzwert abhängig von der aktuellen Drehzahl des Elektromotors ist und aufgrund des funktionellen Zusammenhangs dem Systemdruckgrenzwert entspricht.The operating current limit value is exceeded, the predefined operating current limit value being dependent on the current speed of the electric motor and, due to the functional relationship, corresponding to the system pressure limit value.
Gemäß der Erfindung ist die Steuereinheit ausgeführt, den aktuellen Betriebsstrom des Elektromotors und/oder die aktuelle Drehzahl des Elektromotors zu begrenzen oder zu reduzieren, wenn die Steuereinheit das erste Signal bezüglich der Systemdrucküberschreitung der Fördervorrichtung erzeugt.According to the invention, the control unit is designed to limit or reduce the current operating current of the electric motor and / or the current speed of the electric motor when the control unit generates the first signal relating to the system pressure of the delivery device being exceeded.
Mit anderen Worten kann durch eine intelligente Auswertung des Betriebsstroms und der Drehzahl des Elektromotors der Systemdruck der Fördervorrichtung ohne Druckbegrenzungsventil begrenzt werden. Die erfindungsgemäße Steuereinheit kann somit das Druckbegrenzungsventil ersetzen. Da die Fördervorrichtung somit auf eine mechanische Komponente, die eine gewisse Ausfallswahrscheinlichkeit aufweisen kann, verzichten kann, kann insgesamt die Zuverlässigkeit der Fördervorrichtung erhöht werden. Ferner kann durch Regelung des Elektromotors der Systemdruck schneller und unabhängig von Vorgabewerten begrenzt werden, da ein direkter Zusammenhang zwischen Druck und Betriebsstrom bestehen. Ferner können mechanische Verzögerungen, welche unter anderem wegen Druckwellen in hydraulischen Leitungen auftreten können, vermieden werden. Auch Überschwinger des Systemdrucks und/oder Druckspitzen können rascher begrenzt werden.In other words, through an intelligent evaluation of the operating current and the speed of the electric motor, the system pressure of the delivery device can be limited without a pressure limiting valve. The control unit according to the invention can thus replace the pressure limiting valve. Since the conveying device can thus dispense with a mechanical component, which can have a certain probability of failure, the overall reliability of the conveying device can be increased. Furthermore, by regulating the electric motor, the system pressure can be limited more quickly and independently of specified values, since there is a direct relationship between pressure and operating current. Furthermore, mechanical delays, which can occur due to pressure waves in hydraulic lines, among other things, can be avoided. System pressure overshoots and / or pressure peaks can also be limited more quickly.
Dabei kann der Begriff "Fördervorrichtung" in einem weiten Sinne verstanden werden. Das heißt, dass die im Einzelnen genannten Komponenten der Fördervorrichtung nicht zwingendermaßen eine gesamte bauliche Einheit bilden müssen. So können beispielsweise die Fahrzeugpumpe, der Elektromotor zum Antreiben der Fahrzeugpumpe und die Steuereinheit unterschiedliche, voneinander getrennte bauliche Einheiten beschreiben. Beispielsweise kann die Steuereinheit zum Steuern des Elektromotors ein Teil einer Motorsteuerung sein. Weiterhin ist auch möglich, dass verschiedene Komponenten der Fördervorrichtung zusammen eine bauliche Einheit bilden. Beispielsweise können die Fahrzeugpumpe und der Elektromotor zum Antreiben der Fahrzeugpumpe zusammen eine bauliche Einheit bilden. Ferner kann auch die Steuereinheit zum Steuern des Elektromotors zusammen mit der Fahrzeugpumpe und dem Elektromotor eine bauliche Einheit sein.The term "conveying device" can be understood in a broad sense. This means that the components of the conveying device mentioned in detail do not necessarily have to form an entire structural unit. For example, the vehicle pump, the electric motor for driving the vehicle pump and the control unit can be different from one another describe separate structural units. For example, the control unit for controlling the electric motor can be part of a motor controller. Furthermore, it is also possible that different components of the conveyor device together form a structural unit. For example, the vehicle pump and the electric motor for driving the vehicle pump can together form a structural unit. Furthermore, the control unit for controlling the electric motor can also be a structural unit together with the vehicle pump and the electric motor.
Im Zusammenhang mit der vorliegenden Erfindung kann die Fahrzeugpumpe auf unterschiedliche Arten realisiert sein. Beispielsweise kann die Fahrzeugpumpe eine Gerotorpumpe sein. Ferner kann die Fahrzeugpumpe als Schrauben- oder Rollenzellenpumpe ausgeführt sein. Es sind jedoch auch andere Ausführungen der Fahrzeugpumpe möglich. Dabei kann unter der Fahrzeugpumpe eine Pumpe, welche im Automobilbereich eingesetzt werden kann, verstanden werden. Der Elektromotor kann zum Befördern des Mediums mit der Fahrzeugpumpe verbunden sein, so dass dieser die Pumpe antreibt. Dabei kann der Elektromotor als mechanisch kommutierter bzw. DC-Motor oder als elektrisch kommutierter bzw. EC-Motor ausgeführt sein. Die vorliegende Erfindung ist hierbei beide Arten von Elektromotoren und auch auf andere Elektromotoren anwendbar.In connection with the present invention, the vehicle pump can be implemented in different ways. For example, the vehicle pump can be a gerotor pump. Furthermore, the vehicle pump can be designed as a screw or roller cell pump. However, other designs of the vehicle pump are also possible. The vehicle pump can be understood to mean a pump which can be used in the automotive sector. The electric motor can be connected to the vehicle pump for conveying the medium, so that it drives the pump. The electric motor can be designed as a mechanically commutated or DC motor or as an electrically commutated or EC motor. The present invention is applicable to both types of electric motors and also to other electric motors.
Je nach Elektromotor kann es verschiedene Möglichkeiten geben, wie die Steuereinheit die aktuelle Drehzahl des Elektromotors ermitteln kann. Beispielsweise können elektrisch kommutierte Elektromotoren drehzahlgeregelt sein. Somit besteht die Möglichkeit, dass bei elektrisch kommutierten Elektromotoren die Steuereinheit die Drehzahl des Elektromotors von einer Regeleinheit des Elektromotors erhält. Ferner kann die Steuereinheit zum Steuern des Elektromotors und die Regeleinheit des Elektromotors die gleiche Einheit sein. Außerdem kann auch eine separate Ermittlung der Drehzahl des Elektromotors erfolgen. Beispielsweise kann bei mechanisch kommutierten Elektromotoren die Drehzahl des Elektromotors über das Überwachen von Stromrippeln des Elektromotors durch die Steuereinheit erfolgen. Unter dem Betriebsstrom des Elektromotors kann der Strom verstanden werden, der zum Antrieb des Elektromotors verbraucht wird. Beispielsweise kann darunter der Strom verstanden werden, der durch die Wicklungen des Elektromotors fließt. Mit anderen Worten kann unter dem Betriebsstrom des Elektromotors ein Phasenstrom des Elektromotors bei EC-Motoren verstanden werden. Als aktueller Betriebsstrom kann ein Effektivwert oder pseudo-Effektivwert des Betriebsstroms mit geeigneter Integrationszeit verwendet werden. Beispielsweise kann dafür über eine elektrische Periode oder eine Mechanische Umdrehung integriert werden. Bei DC-Motoren kann ein gleitender Mittelwert als aktueller Betriebsstrom verwendet werden. Dabei kann im Kontext der vorliegenden Erfindung unter "aktuell" verstanden werden, dass ein Betriebsstrom zum Zeitpunkt der Ermittlung verwendet wird. Dies schließt nicht aus, dass es sich beim Betriebsstrom um einen Mittelwert oder einen Effektivwert bzw. pseudo-Effektivwert handelt, der über einen gewissen Zeitraum definiert sein kann.Depending on the electric motor, there can be various ways in which the control unit can determine the current speed of the electric motor. For example, electrically commutated electric motors can be speed-regulated. There is thus the possibility that, in the case of electrically commutated electric motors, the control unit receives the speed of the electric motor from a control unit of the electric motor. Furthermore, the control unit for controlling the electric motor and the regulating unit of the electric motor can be the same unit. In addition, the speed of the electric motor can also be determined separately. For example, in the case of mechanically commutated electric motors, the speed of the electric motor can take place via the monitoring of current ripples in the electric motor by the control unit. The operating current of the electric motor can be understood to mean the current that is used to drive the electric motor. For example, this can be understood to mean the current that flows through the windings of the electric motor. In other words, the operating current of the electric motor can be understood to mean a phase current of the electric motor in the case of EC motors. An effective value or a pseudo-effective value can be used as the current operating current of the operating current can be used with a suitable integration time. For example, it can be integrated over an electrical period or a mechanical revolution. With DC motors, a moving average can be used as the current operating current. In the context of the present invention, “currently” can be understood to mean that an operating current is being used at the time of the determination. This does not rule out that the operating current is an average value or an effective value or pseudo-effective value that can be defined over a certain period of time.
Im Kontext der vorliegenden Erfindung kann unter einer aktuellen Größe eine momentane Größe verstanden werden, wobei nicht ausgeschlossen wird, dass es sich bei der Größe um eine in einem bestimmten Zeitraum ermittelte Größe handelt. Bei der Größe kann es sich beispielsweise um einen Betriebsstrom, eine Drehzahl, einen Systemdruck oder um eine andere Größe handeln. Mit anderen Worten muss das Merkmal "aktuell" bzw. "momentan" in diesem Zusammenhang nicht eng ausgelegt werden.In the context of the present invention, a current variable can be understood to mean a momentary variable, whereby it is not excluded that the variable is a variable determined in a specific period of time. The variable can be, for example, an operating current, a speed, a system pressure or another variable. In other words, the feature “currently” or “currently” need not be interpreted narrowly in this context.
Die Steuereinheit kann also ausgeführt sein, den ermittelten aktuellen Betriebsstrom des Elektromotors mit einem vordefinierten Betriebsstromgrenzwert zu vergleichen. Dieser Betriebsstromgrenzwert kann beispielsweise in einem entsprechenden Kennfeld der Steuereinheit gespeichert sein. Dabei kann unter dem vordefinierten Betriebsstromgrenzwert auch ein vorgegebener Betriebsstromgrenzwert verstanden werden. Dieser Betriebsstromgrenzwert kann beispielsweise fest in der Steuereinheit oder in einer Speichereinheit, auf welche die Steuereinheit zugreifen kann, gespeichert sein. Mit anderen Worten kann der vordefinierte Betriebsstromgrenzwert eine Betriebsstromgrenzwertkurve sein. Das heißt, der Betriebsstromgrenzwert kann mehrere Punkte einer Betriebsstromgrenzwertkurve umfassen. Somit kann der vordefinierte Betriebsstromgrenzwert für unterschiedliche Drehzahlen des Elektromotors unterschiedlich sein. Ferner kann der Betriebsstromgrenzwert auch von anderen Parametern abhängen, z. B. von der Spannung des Elektromotors.The control unit can therefore be designed to compare the determined current operating current of the electric motor with a predefined operating current limit value. This operating current limit value can be stored, for example, in a corresponding characteristic map of the control unit. The predefined operating current limit value can also be understood to mean a predefined operating current limit value. This operating current limit value can, for example, be permanently stored in the control unit or in a memory unit which the control unit can access. In other words, the predefined operating current limit value can be an operating current limit value curve. That is to say, the operating current limit value can comprise several points on an operating current limit value curve. The predefined operating current limit value can thus be used for different The speeds of the electric motor can be different. Furthermore, the operating current limit value can also depend on other parameters, e.g. B. from the voltage of the electric motor.
Zwischen dem Systemdruck der Fördervorrichtung, dem Betriebsstrom des Elektromotors und der Drehzahl des Elektromotors kann ein funktioneller Zusammenhang bestehen. Der Systemdruck kann dabei beispielsweise den Druck des Mediums in der Fahrzeugpumpe und/oder in Zu- oder Ableitungen der Fahrzeugpumpe bezeichnen. Die Kurve, welche durch den von der aktuellen Drehzahl des Elektromotors abhängigen Betriebsstromgrenzwert beschrieben ist, kann eine Linie konstanten Drucks bzw. eine Isobare beschreiben. Anders formuliert kann der Betriebsstromgrenzwert einen Systemdruckgrenzwert definieren. Ferner kann die Steuereinheit ausgeführt sein, den aktuellen Betriebsstrom mit dem vordefinierten Betriebsstromgrenzwert für die aktuelle Drehzahl zu vergleichen. Beispielsweise kann die Steuereinheit ausgeführt sein, ein Kennfeld, in welchem der Betriebsstromgrenzwert für die aktuelle Drehzahl gespeichert ist, auszulesen und diesen Wert mit dem aktuellen Betriebsstrom zu vergleichen. Wenn der aktuelle Betriebsstrom den aktuellen Betriebsstromgrenzwert überschreitet, so erzeugt die Steuereinheit das erste Signal bezüglich der Betriebsstromüberschreitung. Dieses erste Signal kann beispielsweise an eine Regelungseinheit des Elektromotors und/oder an eine Motorsteuerung gesendet werden. Beispielsweise kann dieses erste Signal dazu führen, dass der Elektromotor derart geregelt wird, dass der Systemdruck in der Fördervorrichtung wieder sinkt. Auf diese Weise kann durch die Überwachung des Betriebsstroms und der Drehzahl des Elektromotors der Systemdruck der Pumpe überwacht und gesteuert werden.A functional relationship can exist between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor. The system pressure can denote, for example, the pressure of the medium in the vehicle pump and / or in the supply or discharge lines of the vehicle pump. The curve, which is described by the operating current limit value dependent on the current speed of the electric motor, can describe a line of constant pressure or an isobar. In other words, the operating current limit value can define a system pressure limit value. Furthermore, the control unit can be designed to compare the current operating current with the predefined operating current limit value for the current speed. For example, the control unit can be designed to read out a characteristic field in which the operating current limit value for the current speed is stored and to compare this value with the current operating current. If the current operating current exceeds the current operating current limit value, the control unit generates the first signal relating to the operating current being exceeded. This first signal can be sent, for example, to a control unit of the electric motor and / or to a motor controller. For example, this first signal can lead to the electric motor being regulated in such a way that the system pressure in the delivery device drops again. In this way, the system pressure of the pump can be monitored and controlled by monitoring the operating current and the speed of the electric motor.
Dabei muss es nicht erforderlich sein, dass die Steuereinheit vorerst einen Systemdruck ausrechnet, um eine Systemdrucküberschreitung zu erkennen. Ferner kann die Steuereinheit weitere Parameter wie z. B. die Temperatur des Kraftstoffes zur Ermittlung einer Systemdrucküberschreitung verwenden.It does not have to be necessary for the control unit to first calculate a system pressure in order to determine whether the system pressure is exceeded to recognize. Furthermore, the control unit can further parameters such. B. use the temperature of the fuel to determine if the system pressure is exceeded.
Ferner ist die Steuereinheit ausgeführt, das erste Signal bezüglich der Systemdrucküberschreitung der Fördervorrichtung zu erzeugen, wenn der berechnete aktuelle Systemdruck der Fördervorrichtung einen vordefinierten Systemdruckgrenzwert überschreitet.Furthermore, the control unit is designed to generate the first signal relating to the system pressure of the delivery device being exceeded if the calculated current system pressure of the delivery device exceeds a predefined system pressure limit value.
Unter dem funktionellen Zusammenhang kann beispielsweise eine Formel verstanden werden, mit welcher der Systemdruck der Fördervorrichtung in Abhängigkeit des Betriebsstroms des Elektromotors und der Drehzahl des Elektromotors berechnet werden kann. Diese Formel kann beispielsweise in der Steuereinheit oder in einer Speichereinheit, auf welche die Steuereinheit zugreifen kann, gespeichert sein. Ferner kann der funktionelle Zusammenhang auch in Form einer Kurve oder in Form mehrerer Punkte definiert sein. Beispielsweise kann auf der Steuereinheit und/oder auf der Speichereinheit eine Mehrzahl von Punkten einer Systemdruckgrenzwertkurve gespeichert sein, welche eine Kurve gemäß dem funktionellen Zusammenhang beschreiben.The functional relationship can be understood, for example, as a formula with which the system pressure of the delivery device can be calculated as a function of the operating current of the electric motor and the speed of the electric motor. This formula can be stored, for example, in the control unit or in a memory unit which the control unit can access. Furthermore, the functional relationship can also be defined in the form of a curve or in the form of several points. For example, a plurality of points of a system pressure limit value curve which describe a curve according to the functional relationship can be stored on the control unit and / or on the memory unit.
Auf diese Weise kann die Steuereinheit ermitteln, welcher Systemdruck in der Fördervorrichtung vorherrscht. Ferner kann die Steuereinheit konfiguriert werden, bei welchem Systemdruck das erste Signal bezüglich der Systemdrucküberschreitung der Fördervorrichtung erzeugt wird. Beispielsweise kann die Steuereinheit auch von einer anderen Einheit einen neuen bzw. einen geänderten Systemdruckgrenzwert erhalten, bei dessen Überschreiten das erste Signal erzeugt werden soll.In this way, the control unit can determine which system pressure prevails in the delivery device. Furthermore, the control unit can be configured at which system pressure the first signal relating to the system pressure being exceeded by the delivery device is generated. For example, the control unit can also receive a new or changed system pressure limit value from another unit Exceed the first signal to be generated.
Typischerweise können Systemdrücke bzw. Arbeitsdrücke für moderne Kraftstoffsysteme in einem Bereich von etwa 2 bis 7 bar liegen. Der Systemdruckgrenzwert kann in einem Bereich von 5 bis 8 bar liegen. Der kritische Systemdruckgrenzwert kann in einem Bereich von 7 bis 8 oder in einem Bereich von 7 bis 9 bar liegen. Dabei können diese Grenzwerte systemabhängig sein, z.B. von der mechanischen Belastung der Leitungen. Die Grenzwerte können daher auch andere Werte aufweisen.Typically, system pressures or working pressures for modern fuel systems can be in a range from approximately 2 to 7 bar. The system pressure limit can be in a range from 5 to 8 bar. The critical system pressure limit value can be in a range from 7 to 8 or in a range from 7 to 9 bar. These limit values can be system-dependent, e.g. on the mechanical load on the lines. The limit values can therefore also have other values.
Gemäß einer weiteren beispielhaften Ausführungsform der Erfindung ist in der Steuereinheit der Fördervorrichtung ein pumpenspezifischer Verlauf des Betriebsstroms in Abhängigkeit von der Drehzahl bei gegebenem Druck gespeichert. Mit anderen Worten kann in der Steuereinheit eine Kurve konstanten Drucks bzw. eine Isobare gespeichert sein. Ferner können in der Steuereinheit der Fördervorrichtung mehrere pumpenspezifische Verläufe des Betriebsstroms in Abhängigkeit von der Drehzahl für unterschiedliche Drücke gespeichert sein.According to a further exemplary embodiment of the invention, a pump-specific course of the operating current as a function of the speed at a given pressure is stored in the control unit of the delivery device. In other words, a curve of constant pressure or an isobar can be stored in the control unit. Furthermore, a plurality of pump-specific courses of the operating current as a function of the speed for different pressures can be stored in the control unit of the delivery device.
Auf diese Weise kann die Steuereinheit ermitteln, ob die ermittelte Kombination von aktuellem Betriebsstrom und aktueller Drehzahl oberhalb, unterhalb oder auf der Kurve des pumpenspezifischen Verlaufs des Betriebsstroms positioniert ist. Somit kann die Steuereinheit auf einfache Weise ermitteln, ob der Systemdruckgrenzwert überschritten oder unterschritten wird.In this way, the control unit can determine whether the determined combination of current operating current and current speed is positioned above, below or on the curve of the pump-specific course of the operating current. The control unit can thus determine in a simple manner whether the system pressure limit value is exceeded or not reached.
Gemäß einer weiteren beispielhaften Ausführungsform der Erfindung ist die Steuereinheit ausgeführt, den aktuellen Betriebsstrom des Elektromotors und/oder die aktuelle Drehzahl des Elektromotors zu begrenzen oder zu reduzieren, wenn die Steuereinheit das erste Signal bezüglich der Systemdrucküberschreitung der Fördervorrichtung erzeugt.According to a further exemplary embodiment of the invention, the control unit is designed to limit or reduce the current operating current of the electric motor and / or the current speed of the electric motor when the control unit generates the first signal relating to the system pressure being exceeded by the delivery device.
Mit anderen Worten kann die Steuereinheit ausgeführt sein, den Betrieb des Elektromotors derart anzupassen, dass der Systemdruck der Fördervorrichtung begrenzt oder gesenkt wird. Darunter kann auch verstanden werden, dass die Steuereinheit einer Regeleinheit des Elektromotors ein Signal zur Begrenzung oder zur Senkung des Betriebsstroms und/oder der Drehzahl sendet. Die Regeleinheit kann dann den Betriebsstrom und/oder die Drehzahl begrenzen oder senken. Auf diese Weise kann die Steuereinheit der Systemdrucküberschreitung der Fördervorrichtung entgegenwirken und den Elektromotor so ansteuern, dass der Systemdruck wieder unterhalb des vordefinierten Systemdruckgrenzwerts ist.In other words, the control unit can be designed to adapt the operation of the electric motor in such a way that the system pressure the conveyor is limited or lowered. This can also be understood to mean that the control unit sends a signal to a control unit of the electric motor to limit or reduce the operating current and / or the speed. The control unit can then limit or reduce the operating current and / or the speed. In this way, the control unit can counteract the excess of the system pressure of the delivery device and control the electric motor in such a way that the system pressure is again below the predefined system pressure limit value.
Gemäß einer weiteren beispielhaften Ausführungsform der Erfindung ist die Steuereinheit ausgeführt, ein zweites Signal bezüglich einer kritischen Systemdrucküberschreitung der Fördervorrichtung zu erzeugen, wenn der berechnete aktuelle Systemdruck der Fördervorrichtung einen vordefinierten kritischen Systemdruckgrenzwert überschreitet. Ferner ist die Steuereinheit ausgeführt, die Fördervorrichtung abzuschalten, wenn die Steuereinheit das zweite Signal bezüglich der kritischen Systemdrucküberschreitung der Fördervorrichtung erzeugt und der Systemdruck der Fördervorrichtung den kritischen Systemdruckgrenzwert während einem vordefinierten Zeitraum überschreitet.According to a further exemplary embodiment of the invention, the control unit is designed to generate a second signal relating to a critical system pressure excess of the delivery device if the calculated current system pressure of the delivery device exceeds a predefined critical system pressure limit value. Furthermore, the control unit is designed to switch off the delivery device when the control unit generates the second signal relating to the critical system pressure being exceeded by the delivery device and the system pressure of the delivery device exceeds the critical system pressure limit value during a predefined period of time.
Mit anderen Worten kann ein zweiter Systemdruckgrenzwert, nämlich der kritische Systemdruckgrenzwert, in der Steuereinheit oder in einer Speichereinheit, auf welche die Steuereinheit zugreifen kann, gespeichert sein. Dieser kritische Systemdruckgrenzwert kann dabei höher sein als der Systemdruckgrenzwert. Beispielsweise kann es erforderlich sein, dass bei Überschreiten des kritischen Systemdruckgrenzwerts ein rasches Begrenzen des Systemdrucks der Fördervorrichtung erforderlich ist. Sollte dieser kritische Systemdruckgrenzwert während dem vordefinierten Zeitraum nicht unterschritten werden, so kann die Steuereinheit ausgeführt sein, die Fördervorrichtung abzuschalten. Auf diese Weise können Schäden an der Fördervorrichtung oder an anderen Komponenten verhindert werden, welche durch eine zu lange Überschreitung des kritischen Systemdruckgrenzwerts entstehen können. Mit anderen Worten kann die Steuereinheit ausgeführt sein, eine Notabschaltung der Fördervorrichtung vorzunehmen, wenn der kritische Systemdruckgrenzwert zu lange überschritten wird. Dabei kann das Merkmal "zu lange" bedeuten, dass die Überschreitung des kritischen Systemdruckgrenzwerts länger dauert als der vordefinierte Zeitraum.In other words, a second system pressure limit value, namely the critical system pressure limit value, can be stored in the control unit or in a memory unit which the control unit can access. This critical system pressure limit value can be higher than the system pressure limit value. For example, it may be necessary for the system pressure of the delivery device to be quickly limited when the critical system pressure limit value is exceeded. If this critical system pressure limit value is not undershot during the predefined period, the control unit can be designed to switch off the delivery device. In this way, damage to the conveyor device or other components can be prevented, which by a the critical system pressure limit may be exceeded for too long. In other words, the control unit can be designed to carry out an emergency shutdown of the delivery device if the critical system pressure limit value is exceeded for too long. The feature "too long" can mean that the critical system pressure limit value is exceeded for longer than the predefined period of time.
Ein weiterer Aspekt der Erfindung betrifft ein Fahrzeug mit einer im Kontext der vorliegenden Erfindung beschriebenen Fördervorrichtung, wobei die Fahrzeugpumpe der Fördervorrichtung eine Kraftstoffpumpe zum Befördern von Kraftstoff für einen Verbrennungsmotor des Fahrzeugs ist.Another aspect of the invention relates to a vehicle with a delivery device described in the context of the present invention, the vehicle pump of the delivery device being a fuel pump for delivering fuel for an internal combustion engine of the vehicle.
Das Fahrzeug kann beispielsweise ein Kraftfahrzeug oder ein Lastkraftfahrzeug sein, welches durch den Verbrennungsmotor angetrieben wird. Ferner kann das Fahrzeug auch mit einem Hybridantrieb ausgestattet sein. Ferner sind die im Zusammenhang mit der Fördervorrichtung genannten Merkmale und Vorteile auch auf das Fahrzeug anwendbar. Weiterhin kann das Fahrzeug auch mit einer Steuereinheit, welche den Elektromotor der Fördervorrichtung erfindungsgemäß steuert, nachgerüstet worden sein.The vehicle can be, for example, a motor vehicle or a truck that is driven by the internal combustion engine. Furthermore, the vehicle can also be equipped with a hybrid drive. Furthermore, the features and advantages mentioned in connection with the conveying device can also be applied to the vehicle. Furthermore, the vehicle can also have been retrofitted with a control unit which controls the electric motor of the conveying device according to the invention.
Ein weiterer Aspekt der Erfindung betrifft ein Verfahren zum Befördern eines Mediums und zum Begrenzen eines Systemdrucks einer Fördervorrichtung, welche eine mit einem Elektromotor angetriebene Fahrzeugpumpe aufweist. Dabei weist das Verfahren den Schritt des Überwachens einer aktuellen Drehzahl und eines aktuellen Betriebsstroms des Elektromotors auf. Ferner weist das Verfahren den Schritt des Erzeugens eines ersten Signals bezüglich einer Systemdrucküberschreitung der Fördervorrichtung, wenn der aktuelle Betriebsstrom des Elektromotors einen vordefinierten Betriebsstromgrenzwert überschreitet, auf. Dabei ist der vordefinierte Betriebsstromgrenzwert abhängig von der aktuellen Drehzahl des Elektromotors.Another aspect of the invention relates to a method for conveying a medium and for limiting a system pressure of a conveying device which has a vehicle pump driven by an electric motor. The method has the step of monitoring a current speed and a current operating current of the electric motor. Furthermore, the method has the step of generating a first signal relating to an excess of the system pressure of the delivery device when the current operating current of the electric motor exceeds a predefined operating current limit value. The predefined operating current limit value is dependent on the current speed of the electric motor.
Dabei können die Schritte des Verfahrens in unterschiedlichen Reihenfolgen und/oder parallel erfolgen. Dieses Verfahren kann ferner durch eine Steuereinheit einer im Kontext dieser Erfindung beschriebenen Fördervorrichtung durchgeführt werden. Somit sind die Merkmale, die im Zusammenhang mit der beschriebenen Fördervorrichtung genannt werden, auch auf Verfahren, die oben und im Folgenden beschrieben sind, anwendbar.The steps of the process can be different Sequences and / or take place in parallel. This method can also be carried out by a control unit of a conveyor device described in the context of this invention. Thus, the features that are mentioned in connection with the conveyor device described can also be applied to methods that are described above and below.
Gemäß einer beispielhaften Ausführungsform der Erfindung weist das Verfahren weiterhin den Schritt des Berechnens eines aktuellen Systemdrucks der Fördervorrichtung in Abhängigkeit der aktuellen Drehzahl und des aktuellen Betriebsstroms des Elektromotors basierend auf einem funktionellen Zusammenhang zwischen dem Systemdruck der Fördervorrichtung, dem Betriebsstrom des Elektromotors und der Drehzahl des Elektromotors auf. Ferner beinhaltet das Verfahren den Schritt des Erzeugens des ersten Signals bezüglich der Systemdrucküberschreitung der Fördervorrichtung, wenn der berechnete aktuelle Systemdruck der Fahrzeugpumpe einen vordefinierten Systemdruckgrenzwert überschreitet.According to an exemplary embodiment of the invention, the method furthermore has the step of calculating a current system pressure of the delivery device as a function of the current speed and the current operating current of the electric motor based on a functional relationship between the system pressure of the delivery device, the operating current of the electric motor and the speed of the electric motor on. The method further includes the step of generating the first signal relating to the system pressure being exceeded by the delivery device if the calculated current system pressure of the vehicle pump exceeds a predefined system pressure limit value.
Ein weiterer Aspekt der Erfindung betrifft ein Programmelement, das, wenn es auf einem Prozessor ausgeführt wird, den Prozessor anleitet, ein im Kontext der vorliegenden Erfindung beschriebenes Verfahren auszuführen.Another aspect of the invention relates to a program element which, when executed on a processor, instructs the processor to execute a method described in the context of the present invention.
Dabei kann das Programmelement auf eine Steuereinheit einer Fördervorrichtung geladen werden, die die Schritte des Verfahrens ausführt. Das Programmelement kann ferner ein Teil eines Computerprogramms sein. Außerdem kann das Programmelement auch selbst ein selbstständiges Computerprogramm sein. Beispielsweise kann das Programmelement als Update ein bereits bestehendes Computerprogramm zum Ausführen des erfindungsgemäßen Verfahrens befähigen. Da das Programmelement ausgeführt ist, den Prozessor anzuleiten, ein im Kontext dieser Erfindung beschriebenes Verfahren auszuführen, treffen die im Zusammenhang mit dem Verfahren genannten Vorteile und Merkmale auch auf das Programmelement zu.In this case, the program element can be loaded onto a control unit of a conveying device that executes the steps of the method. The program element can also be part of a computer program. In addition, the program element can itself be an independent computer program. For example, as an update, the program element can enable an already existing computer program to carry out the method according to the invention. Since the program element is designed to instruct the processor to execute a method described in the context of this invention, the advantages and features mentioned in connection with the method also apply to the program element.
Ein weiterer Aspekt der Erfindung betrifft ein computerlesbares Medium, auf dem ein Programmelement gespeichert ist, das, wenn es auf einem Prozessor ausgeführt wird, den Prozessor anleitet, ein im Kontext der vorliegenden Erfindung beschriebenes Verfahren auszuführen.Another aspect of the invention relates to a computer-readable medium on which a program element is stored which, when it is executed on a processor, instructs the processor to execute a method described in the context of the present invention.
Dabei kann das computerlesbare Medium als Speichermedium, zum Beispiel als USB-Stick, als CD, als DVD, als Festplatte oder als sonstiges Speichermedium angesehen werden. Ferner kann das computerlesbare Medium auch als Mikrochip ausgeführt sein, der eine Steuereinheit befähigt, das erfindungsgemäße Verfahren auszuführen.The computer-readable medium can be viewed as a storage medium, for example a USB stick, CD, DVD, hard drive or other storage medium. Furthermore, the computer-readable medium can also be designed as a microchip, which enables a control unit to carry out the method according to the invention.
Die beschriebenen Ausführungsformen betreffen gleichermaßen eine Fördervorrichtung, ein Fahrzeug, ein Verfahren, ein Programmelement und ein computerlesbares Medium, obwohl einzelne Ausführungsformen ausschließlich in Bezug zu der Fördervorrichtung, dem Fahrzeug, dem Verfahren, dem Programmelement oder dem computerlesbaren Medium beschrieben werden. Synergetische Effekte können sich aus verschiedenen Kombinationen der Ausführungsformen ergeben, auch wenn diese im Folgenden nicht beschrieben werden.The described embodiments relate equally to a conveyor device, a vehicle, a method, a program element and a computer-readable medium, although individual embodiments are described exclusively in relation to the conveyor device, the vehicle, the method, the program element or the computer-readable medium. Synergetic effects can result from various combinations of the embodiments, even if these are not described below.
Weitere Merkmale, Vorteile und Anwendungsmöglichkeiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung der Ausführungsbeispiele und der Figuren. Dabei bilden alle beschriebenen und/oder bildlich dargestellten Merkmale für sich und in beliebiger Kombination den Gegenstand der Erfindung auch unabhängig von ihrer Zusammensetzung in den einzelnen Ansprüchen oder deren Rückbezügen.Further features, advantages and possible applications of the invention emerge from the following description of the exemplary embodiments and the figures. All of the features described and / or shown in the figures, individually and in any combination, form the subject matter of the invention, regardless of their composition in the individual claims or their references.
Kurze Beschreibung der Figuren
- Fig. 1
- zeigt eine Fördervorrichtung gemäß einem Ausführungsbeispiel der Erfindung.
- Fig. 2
- zeigt ein Diagramm gemäß einem Ausführungsbeispiel der Erfindung.
- Fig. 3
- zeigt ein Fahrzeug gemäß einem Ausführungsbeispiel der Erfindung.
- Fig. 4
- zeigt ein Flussdiagramm eines Verfahrens gemäß einem Ausführungsbeispiel der Erfindung.
- Fig. 1
- shows a conveyor device according to an embodiment of the invention.
- Fig. 2
- shows a diagram according to an embodiment of the invention.
- Fig. 3
- shows a vehicle according to an embodiment of the invention.
- Fig. 4
- shows a flow chart of a method according to an embodiment of the invention.
Dabei sind die Figuren schematisch und nicht maßstabsgetreu dargestellt.The figures are shown schematically and not true to scale.
In
Gemäß einem weiteren, anhand von
Ferner kann die Steuereinheit 103 ausgeführt sein, beim Erzeugen des Signals bei Überschreiten des ersten Druckgrenzwerts weitere Maßnahmen folgen zu lassen. Dabei kann die Steuereinheit im typischen Normalbetrieb den Systemdruck auf einen bestimmten Vorgabewert regeln, indem der aktuelle Betriebsstrom des Elektromotors 102 auf einen drehzahlabhängigen Stromwert, welcher in einem Kennfeld gespeichert ist, geregelt wird. Dabei kann der Steuereinheit 103 ein Drucksollwert von einer übergeordneten Steuerung der Brennkraftmaschine kommuniziert werden, welcher durch Regeln des Betriebsstroms erreicht werden soll. Ferner kann die Steuereinheit im Fehlerbetrieb ein typisches Verhaltensmuster aufweisen. Beispielsweise kann ein solches Verhaltensmuster aufgerufen werden, wenn gar kein Kraftstoff mehr abgenommen wird und der geforderte erste Druckgrenzwert bei sehr geringen Abnahmemengen nicht mehr eingehalten werden kann, weil beispielsweise eine minimale Drehzahl nicht unterschritten werden kann. Gegebenenfalls kann die Steuereinheit 103 versuchen, den Systemdruck der Fahrzeugpumpe 101 auf einen bestimmten Wert unterhalb des ersten Druckgrenzwerts zu begrenzen, indem der Strom auf einen drehzahlabhängigen Wert entsprechend einem Kennfeld begrenzt wird. Ferner kann auch die Drehzahl des Elektromotors 102 oder eine Kombination aus Drehzahl und Betriebsstrom begrenzt werden. Bei Überschreiten eines zweiten Druckgrenzwerts kann die Steuereinheit ein zweites Signal erzeugen. Der zweite Druckgrenzwert kann beispielsweise dem kritischen Systemdruckgrenzwert entsprechen. Die Steuereinheit kann versuchen, den Systemdruck der Fahrzeugpumpe 101 auf einen bestimmten Wert unterhalb zweiten Druckgrenzwert durch Begrenzen des Stroms auf einen drehzahlabhängigen Wert entsprechend einem Kennfeld oder durch Begrenzen der Drehzahl oder durch eine Kombination aus beidem zu reduzieren. Ferner kann die Steuereinheit auch ausgeführt sein, die Fördervorrichtung 100 bzw. die Pumpe 101 direkt abzuschalten, wenn der zweite Druckgrenzwert eine gewisse Zeit nicht begrenzt werden konnte. Dies dient zum Systemschutz, damit beispielsweise größere Schäden vermieden werden können. Ferner kann die Steuereinheit auch ausgeführt sein, eine Warnmeldung zu erzeugen, welche beispielsweise an die Motorsteuerung gesendet wird, dass die Pumpe abgeschaltet ist. Die Motorsteuerung kann dann entsprechende Maßnahmen treffen. Gegebenenfalls kann die Steuereinheit 103 einen Neuanlauf der Fördervorrichtung 100 erfolgen lassen, bei welchem weiterhin ein aktives Steuersignal mit der Information "Pumpe aktiv" bzw. mit gültigem Druck oder Drehzahlvorgabewert definiert ist.Furthermore, the
Ferner ist in
In
Die Steuereinheit 103 ist ausgeführt, die Drehzahl und den Betriebsstrom des Elektromotors 102 zu ermitteln. Wenn die Kombination aus der ermittelten Drehzahl und dem ermittelten Betriebsstrom einen Punkt ergibt, der im Diagramm 200 unterhalb der Kurve 203 angeordnet ist, so ist der Systemdruckgrenzwert nicht überschritten, wenn der Punkt, der sich aus ermittelter Drehzahl und ermitteltem Betriebsstrom ergibt, zwischen den Kurven 203 und 204 liegt, so ist der Systemdruckgrenzwert überschritten und der kritische Systemdruckgrenzwert unterschritten, so dass die Steuereinheit 103 das erste Signal erzeugt. Wenn der aus ermittelter Drehzahl und ermitteltem Betriebsstrom resultierende Punkt oberhalb der Kurve 204 angeordnet ist, so ist der Systemdruckgrenzwert und der kritische Systemdruckgrenzwert überschritten, so dass auch das zweite Signal erzeugt wird. Die Systemdruckgrenzwerte bzw. Systemdruckgrenzwertkurven 203 und 204 können auf der Steuereinheit 103 gespeichert sein. Ferner kann auch nur eine der Systemdruckgrenzwertkurven 203 oder 204 auf der Steuereinheit gespeichert sein. Dabei können auch Daten oder Punkte, welche die Systemdruckgrenzwerte bzw. Systemdruckgrenzwertkurven 203 und 204 definieren, auf der Steuereinheit 103 gespeichert sein.The
In
In
Claims (7)
- Method for delivering fuel and for limiting a system pressure of a delivery device, which delivery device has a fuel pump which is driven by means of an electric motor and which is designed for delivering fuel for an internal combustion engine of a vehicle, the method having the steps:ascertaining a present rotational speed and a present operating current of the electric motor (S1);calculating a present system pressure of the delivery device as a function of the present rotational speed and the present operating current of the electric motor on the basis of a functional relationship between the system pressure of the delivery device, the operating current of the electric motor and the rotational speed of the electric motor; generating a first signal relating to a system pressure exceedance of the delivery device if the present operating current of the electric motor exceeds a predefined operating current threshold value (S2);wherein the predefined operating current threshold value is dependent on the present rotational speed of the electric motor and corresponds to the system pressure threshold value; andlimiting or reducing the present operating current of the electric motor and/or the present rotational speed of the electric motor if the signal relating to the system pressure exceedance of the delivery device is generated.
- Computer program comprising commands which, when the program is executed by a control unit of the delivery device (100) according to Claim 4, commands said control unit to carry out the method according to Claim 1.
- Computer-readable medium (109) on which the computer program according to Claim 2 is stored.
- Delivery device (100) for delivering fuel and for limiting a system pressure of the delivery device, the delivery device having:a fuel pump (101) which is designed for conveying fuel for an internal combustion engine of a vehicle;an electric motor (102) for driving the fuel pump;a control unit (103) for controlling the electric motor;wherein the control unit is designed to carry out the method according to Claim 1.
- Delivery device according to Claim 4,
wherein, in the control unit of the delivery device, there is stored a pump-specific profile (203, 204, 205, 206, 207, 208, 209) of the operating current as a function of the rotational speed at a given pressure. - Delivery device according to Claim 5,
wherein the control unit is designed to generate a second signal relating to a critical system pressure exceedance of the delivery device if the calculated present system pressure of the delivery device exceeds a predefined critical system pressure threshold value; and
wherein the control unit is designed to deactivate the delivery device if the control unit generates the second signal relating to the critical system pressure exceedance of the delivery device and the system pressure of the delivery device exceeds the critical system pressure threshold value during a predefined time period. - Vehicle (300) having a delivery device (100) according to any of Claims 4 to 6.
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PCT/EP2015/079931 WO2016102260A1 (en) | 2014-12-23 | 2015-12-16 | Delivery device for delivering a medium and for limiting a system pressure |
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CN108061234A (en) * | 2018-01-12 | 2018-05-22 | 中国航发哈尔滨东安发动机有限公司 | A kind of oil pump interstage casings molded line structure |
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- 2015-12-16 CN CN201580062909.2A patent/CN107002605B/en active Active
- 2015-12-16 EP EP15816432.7A patent/EP3237740B1/en active Active
- 2015-12-16 US US15/539,012 patent/US10563608B2/en active Active
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WO2016102260A1 (en) | 2016-06-30 |
DE102014226972A1 (en) | 2016-06-23 |
EP3237740A1 (en) | 2017-11-01 |
CN107002605A (en) | 2017-08-01 |
US10563608B2 (en) | 2020-02-18 |
US20170363034A1 (en) | 2017-12-21 |
CN107002605B (en) | 2019-09-20 |
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