EP2596221A2 - Procédé de détermination d'une caractéristique pour une soupape de régulation de pression - Google Patents

Procédé de détermination d'une caractéristique pour une soupape de régulation de pression

Info

Publication number
EP2596221A2
EP2596221A2 EP11730615.9A EP11730615A EP2596221A2 EP 2596221 A2 EP2596221 A2 EP 2596221A2 EP 11730615 A EP11730615 A EP 11730615A EP 2596221 A2 EP2596221 A2 EP 2596221A2
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
control
regulating valve
pressure regulating
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.)
Withdrawn
Application number
EP11730615.9A
Other languages
German (de)
English (en)
Inventor
Guenter Veit
Marc Oliver Roehner
Markus Viereck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2596221A2 publication Critical patent/EP2596221A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—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
    • F02D2041/2065—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control being related to the coil temperature
    • 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
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors
    • 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
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F02D41/023—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the gear ratio shifting
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0396—Involving pressure control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7793—With opening bias [e.g., pressure regulator]

Definitions

  • Injection systems usually have two adjusting devices for controlling operating parameters of a fuel to be injected.
  • the metering unit (ZME) is provided as the first adjusting device, with which a volume control of the fuel takes place.
  • Pressure regulation of the fuel takes place with the pressure regulating valve (DRV) as the second actuating device.
  • DVR pressure regulating valve
  • the pressure control valve is operated purely controlled in a pressure control operation on the metering unit.
  • a control of the pressure control valve is designed in the pressure control operation such that the pressure control valve remains closed with inclusion of all relevant tolerance sources.
  • a necessary tolerance reserve on the pressure regulating valve can lead to injection systems being operated with an excessively high opening pressure at the pressure regulating valve, depending on the tolerance position.
  • this can be in an error case, such as.
  • an open clamping metering unit as disadvantageous, because this can result in pressures well above the nominal pressure or setpoint pressure as a possible reference value for the control pressure of the injection system.
  • the increased pressures occurring in such an error case must not lead to a failure of the injection system.
  • Too high pressures can cause bursting of injector lines and thus leakage of fuel into the engine compartment. Furthermore, the durability of components of the injection system can be reduced because their failure can be caused. In addition, there may be a loss of the emergency driving capability with which usually a movement of a vehicle takes place from a danger zone.
  • adaptation functions for determining a characteristic of the pressure regulating valve are provided for a pressure regulating valve, such a characteristic generally being a characteristic curve of the pressure regulating valve.
  • the document DE 10 2004 006 694 A1 describes u. a. a method for operating an internal combustion engine with an injection system, in particular for a motor vehicle.
  • fuel is delivered from a metering unit and a high pressure pump into a fuel storage.
  • the pressure in the fuel storage is detected and controlled by controlling the metering unit by the controller.
  • it is proposed to determine an individual characteristic curve for the currently used metering unit and in the pressure control consider.
  • an individual characteristic curve is learned, typically for a pump.
  • the fuel is conveyed from a high-pressure fuel pump into a fuel pressure accumulator, from which the fuel passes via at least one injector into at least one combustion chamber of the internal combustion engine.
  • a value for the actual pressure in the fuel pressure accumulator is provided.
  • a pressure control device with which fuel can be discharged from the fuel pressure accumulator, is pre-controlled with a pilot signal, which is determined taking into account a desired pressure in Kraftstoffbuchspei- rather. It is proposed that a value for a fuel quantity flowing through the pressure regulating device be taken into account when determining the pilot control signal. Consequently, a consideration of a flow through a pressure control valve as a basis for the said adaptation functions is described here.
  • a method for operating a fuel injection system in particular for a motor vehicle, is known.
  • the fuel injection system has a fuel storage, the fuel is supplied via a metering unit.
  • an actual pressure in the fuel accumulator is influenced, inter alia, by a current regulator.
  • a precontrol value is generated by a pilot control field with which dingte deviations from components of the fuel injection system can be compensated.
  • a map-based adaptation method for compensating for manufacturing tolerances in a closed-loop control via the metering unit is described here. This can also be used for the mentioned adaptation functions because of the use of an integral control element.
  • Document DE 10 2006 018 164 B3 describes a method and a device for controlling an injection system for an internal combustion engine with a high-pressure pump for conveying fuel into a fuel reservoir to which an injector is hydraulically coupled.
  • the injection system comprises a volume flow control valve, with which a fuel volume flow through the volume flow control valve is adjustable in the high-pressure pump, and a pressure control valve.
  • the pressure control valve is set to a fuel flow rate through the pressure control valve equal to zero.
  • a first control value for the volume flow control valve is determined.
  • a deviation of the control value for the volume flow control valve is determined.
  • a second control value for the volume flow control valve is determined as a function of a reference fuel volume flow through the pressure control valve. The reference fuel flow rate is so great that the pressure control valve allows adjustment of the pressure in the fuel reservoir.
  • the regulation includes a feedforward control.
  • the common-rail injection system has at least one adjusting device, which can be adjusted by control signals, which correspond in each case to control values, for influencing the pressure.
  • a precontrol value for generating at least one actuating signal for the actuating device is determined, and the actual pressure is regulated to a predefined desired pressure by using the precontrol value by generating the at least one actuating signal and output to the actuating device.
  • the feedforward control is adapted as a function of at least one current value of an operating parameter of the internal combustion engine and a control value corresponding to the at least one actuating signal.
  • a method for controlling a direct-injection internal combustion engine is described in the document DE 100 16 900 C2.
  • a memory pressure which occurs in a pressure accumulator of a fuel metering system of the internal combustion engine is regulated by means of an electrically controllable pressure control valve, via which fuel can be led out of the pressure accumulator into a low-pressure region of the fuel metering system to reduce the accumulator pressure.
  • control of the accumulator pressure is preceded by a pilot control, wherein in the pilot control in dependence on the flow through the pressure control valve and the accumulator pressure a control signal for the pressure control valve or in dependence of the flow through the pressure control valve and a drive signal for the Pressure control valve which is determined in the pressure accumulator storage pressure is determined.
  • a device for an early adjustment of the start of injection of an internal combustion engine eg. At cold start or low atmospheric pressure, known.
  • This device is controlled by a directional control valve, which is connected in parallel with a relieved bypass line with an adjustable flow control valve, wherein the adjustability allows control of the Antechnischbeginns the pump curve to the characteristic of the internal combustion engine.
  • a pressure control valve comprises a discharge opening controlled by its pressure control piston, wherein the respectively controlled flow area determines an adaptation of the pump characteristic to the characteristic curve of the internal combustion engine.
  • an adaptation function can be implemented with which a teaching in and / or a correction of tolerances with respect to a characteristic of an opening pressure in at least one printing area is achieved.
  • gelventil an injection system typically a storage injection system (common rail), is possible.
  • the error case can also be taken into account, in which the pressure regulating valve is to be opened by a lower Haitusruckiki.
  • no pressure control operation of the pressure regulating valve is required for the adaptation, so that the fuel does not have to be unnecessarily heated.
  • a monitoring can take place, wherein offset errors and / or pitch errors of a signal of a Rail horrsen- sensor are detected.
  • the rail pressure sensor is generally designed to determine a pressure of the fuel in a fuel reservoir (rail) of the injection system.
  • the adaptation usually takes place during a regulated operation of the metering unit, whereby a frequency of the adaptions can be increased in comparison to the described adaptation functions.
  • the method is in operation of the metering unit in a transient or temporary load shedding, z.
  • Example in a switching operation, achieved by precise Garniervor facedung the pressure control valve just above a provided for carrying out the method pressure, typically control pressure, a reduction of pressure overshoots.
  • pressure typically control pressure
  • a more favorable pressure load change collective can be achieved.
  • the pressure of the fuel in the thrust continues to be regulated via the metering unit. This will be done as part of the
  • Method targeted a low leakage by controlling the pressure and thus the control pressure of the pressure control valve just below the opening pressure of the pressure control valve set.
  • the pressure control pressure
  • the pressure is regulated by a volume control by the metering unit.
  • a characteristic of the pressure regulating valve has a pressure gradient across the flow of the pressure regulating valve.
  • An increase of the control range in overrun mode can be achieved, resulting in smaller
  • the arrangement according to the invention is designed to carry out all the steps of the presented method. In doing so, individual steps can do this
  • Procedures are also performed by individual components of the arrangement. Furthermore, functions of the arrangement or functions of individual components of the arrangement can be implemented as steps of the method. In addition, it is possible that steps of the method may be realized as functions of at least one component of the device or the entire device.
  • FIG. 1 shows a diagram of a first embodiment of a method according to the invention.
  • FIG. 2 shows a diagram of a second embodiment of the method according to the invention.
  • FIG. 3 shows a diagram of a third embodiment of the method according to the invention.
  • FIG. 4 shows a schematic representation of an embodiment of an arrangement according to the invention.
  • the diagram of Figure 1 shows an abscissa 2, along which the time is plotted, and an ordinate 4, along which a pressure of a fuel is plotted in an injection system.
  • curves for a control pressure 6 of a pressure control valve for a target pressure 8 of the fuel and for an actual pressure 10 of the fuel in the high-pressure accumulator, which is controlled via the metering unit, plotted. It is envisaged that an opening 12 of the pressure regulating valve takes place via a detection of an opening pressure by a quasi-pulsed lowering of the control pressure 6 of the pressure regulating valve.
  • a reduction of the control pressure 6 of the pressure regulating valve takes place at an arbitrarily high pressure level until the opening 12 of the pressure regulating valve is detected.
  • the manner of reducing the control pressure 6 and the detection of the opening point of the pressure control valve at the current steady state pressure level can be designed differently.
  • the reduction of the control pressure 6 can be slow and continuous.
  • ramps with different gradients can alternatively be provided for a falling and rising control pressure 6, wherein the level of the smallest control pressure 6 until the opening 12 is recognized by several pressure intervals 14 gradually reduced.
  • the control pressure alternately passes through higher pressure plateaus k 131, k + 2 133, k + 4 135, k + 6 137 and lower pressure plateaus k + 1 132, k + 3 134, k + 5 136, k + 7 138 higher pressure plateaus k 131, k + 2 133, k + 4 135 and k + 6 137 have the same value for the control pressure.
  • a height of the lower pressure plateaus k + 1 132, k + 3 134, k + 5 136 and k + 7 138 is reduced by the pressure intervals 14, respectively.
  • the opening 12 of the pressure regulating valve can be seen upon reaching the k + 7-th low pressure plateau 138 by a conspicuous change in the actual pressure 10, in which case there is a strong rash of the actual pressure 10.
  • the detection of the opening 12 of the pressure regulating valve takes place here with an increase in a value of a regulator output of the metering unit, usually with an increased quantity requirement in the event of a leakage.
  • a drop in the actual pressure 10 or an increase in the control deviation can be used to detect the opening 12.
  • the opening 12 of the pressure regulating valve Due to the hot fuel in the return of the injection system, the opening 12 of the pressure regulating valve can also be detected due to an increase in the temperature of a coil of the pressure regulating valve. This can be done, for example, directly via a temperature sensor or indirectly via an increase in the resistance of the coil of the pressure regulating valve.
  • the opening 12 can also be detected indirectly via a current regulator output. This can be done by increasing the duty cycle at a constant current through a temperature-induced increase in the resistance.
  • an adaptation of a characteristic as a characteristic over the entire range of the desired pressure 10 of the system is carried out.
  • Values for the intended adaptation result from the difference between a nominal value or nominal value of the opening pressure of the pressure regulating valve as a reference value and the determined opening pressure of the
  • Pressure control valve The values obtained in this adaptation can then be used for normal driving.
  • the diagram of Figure 2 also includes an abscissa 22 along which the time is plotted and an ordinate 24 along which the pressure is plotted.
  • a curve for a control pressure 26 of the pressure control valve, a curve for the target pressure 28 and a curve for the actual pressure 30 of the fuel in the high pressure accumulator is shown.
  • Double arrows 32 between the curve for the control pressure 26 and the curve for the actual pressure 30 denote deviations of the control pressure 26 to the actual pressure 30 as a function of the control pressure 26.
  • a shear transition of the target pressure 28 is indicated by a simple arrow 34.
  • This second embodiment of the method is usually suitable for injection systems without leakage.
  • long deceleration phases or shear transitions and / or even transient switching operations if the adaptation can be carried out sufficiently quickly, can be used to detect opening of a pressure regulating valve and to determine a prevailing pressure, ie. H. Control pressure 26, of the fuel to be used.
  • the control value of the pressure control valve can be frozen in relation to its target value at a stationary level 140, 141, 142, 143, 144, 145.
  • a printing plateau 140, 141, 142, 143, 144, 145 is formed.
  • a pump of an injection system is closed and there is no injection.
  • the adaptation value results from a difference between a value of the control pressure 26 when opening the pressure control valve, here depending on the height of the pressure plateau 140, 141, 142, 143, 144, 145, and the target pressure 30 as a reference value, when the pressure control valve opens. Furthermore, the level of the print plateau 140, 141, 142, 143, 144, 145 can be continuously increased from switching operation to switching operation up to the nominal pressure.
  • a reverse order of adaptation is provided due to possible pressure peaks in the switching operation only if the learning information is already present at a nominal pressure, as provided, for example, in the first embodiment of the method. Furthermore, it is provided here that pressure peaks are tolerable or otherwise can be bypassed.
  • the control pressure 26 of the pressure regulating valve may be reduced in steps by passing the pressure plateaus 140, 141, 142, 143, 144, 145; so that the total pressure characteristic for the opening of the pressure regulating valve, starting from the nominal pressure to the minimum control pressure 26 of the respective stationary control pressures 26 and associated pressure plateaus 140, 141, 142, 143, 144, 145 can be determined.
  • the target pressure 28 is below the minimum opening pressure of the pressure regulating valve, since the pump could otherwise be opened again by the pressure regulating valve. In this case, it is also possible to keep the pump specifically closed for the duration of the adaptation in the thrust.
  • an adaptation of the characteristic curve in the first embodiment, an adaptation of the characteristic curve.
  • the diagram from FIG. 3 to a third embodiment of the method according to the invention comprises an abscissa 42, along which the time is plotted, and an ordinate 44, along which the pressure of a fuel to be injected is plotted.
  • a first curve represents a control pressure 46 of the pressure regulating valve and a second curve represents a regulated actual pressure 50 through the metering unit.
  • a straight line indicates a nominal pressure 48 in idling.
  • the arrow 52 indicates a time for stopping the engine.
  • the final stage of the pressure regulating valve is deactivated as soon as the control pressure 46 of the pressure regulating valve has reached zero.
  • the pressure control valve opens at a visible pressure drop at time 54.
  • a mechanical-hydraulic holding pressure of the pressure control valve is displayed. In this mechanical-hydraulic holding pressure, the pressure regulating valve is stationary closed.
  • a pressure equilibrium is set after stopping the engine and a discharge of the pressure control valve between the closing mechanical holding force of the pressure regulating valve and the hydraulic pressure in the injection reservoir (rail).
  • only the currentless opening pressure of the pressure regulating valve with de-energized holding pressure of greater than zero bar and less than the pressure of the injection system is determined via a point adaptation.
  • the mechanical tolerance of such pressure control valves is typically very low in this respect, since it is dependent on relatively few factors, such as, for example, a spring biasing force and / or a seat diameter. This is particularly advantageous for the plausibility of the rail pressure sensor.
  • this opening pressure in contrast, if the currentless opening pressure is above the idling pressure, this opening pressure, similar to the second embodiment of the method, by a shutdown of the final stage, d. H. at minimum control pressure 46, to be determined in thrust.
  • the control pressure 46 drops to a minimum possible pressure or until the setting of a targeted pressure plateau, in which the pressure control valve is opened, in the switching operation. It is provided that the target pressure 48 is below the minimum opening pressure, otherwise the pump is opened by the controller again.
  • FIG 4 shows a schematic representation of a trained as a storage injection system injection system 60 for injecting fuel into an internal combustion engine according to the common rail or accumulator injection method.
  • This injection system 60 comprises a reservoir 62 for the fuel, a low-pressure pump 64 for conveying fuel from the reservoir 62, a metering unit 66 and a high-pressure pump 68.
  • This high-pressure pump 68 is designed to build up a pressure of the fuel within a high pressure accumulator 70 and upright receive.
  • fuel is injected from the high-pressure accumulator 70 into combustion chambers.
  • the injection system 60 includes a rail pressure sensor 72 and a pressure control valve 74, via which fuel can be discharged into the reservoir 62 at overpressure.
  • An arrangement 80 according to the invention in FIG. 4 here comprises two modules 82, 84, which are designed as components of a control device 88.
  • the control device 88 is also designed to monitor and / or control and thus to control and / or regulate functions of individual components of the injection system 60 for operation of the injection system 60 independently of a performance of the method according to the invention.
  • a first module 82 is designed for controlling operating parameters. At this time, the first module 82 minimizes a flow of the fuel flowing through the pressure regulating valve 74 and reduces a control pressure of the fuel until the pressure regulating valve 74 is opened.
  • a second module 84 values of operating parameters are acquired for determining the characteristic to be determined.
  • the second module 84 forms a value for the characteristic and thus typically an adaptation value from a difference of a value for the control pressure at which the pressure regulating valve 74 opens and a reference value for the control pressure.
  • the second module 84 is adapted to adapt the characteristic.
  • the reference value of the control pressure is usually a desired value or a nominal value that is dependent on an operating point of the injection system 60 and / or the internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé de détermination d'une caractéristique pour une soupape de régulation de pression d'un système d'injection servant à injecter du carburant dans un moteur à combustion interne. Selon le procédé, un flux de carburant s'écoulant à travers la soupape de régulation de pression est réglé à un minimum et une pression de commande (6) du carburant est réduite jusqu'à ce que la soupape de régulation de pression s'ouvre, et au moins une valeur pour la caractéristique est formée à partir d'une différence entre une valeur de la pression de commande à laquelle la soupape de régulation de pression s'ouvre, et une valeur de référence de la pression de commande (6).
EP11730615.9A 2010-07-20 2011-06-27 Procédé de détermination d'une caractéristique pour une soupape de régulation de pression Withdrawn EP2596221A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010031570.2A DE102010031570B4 (de) 2010-07-20 2010-07-20 Verfahren zum Bestimmen einer Charakteristik für ein Druckregelventil
PCT/EP2011/060705 WO2012010383A2 (fr) 2010-07-20 2011-06-27 Procédé de détermination d'une caractéristique pour une soupape de régulation de pression

Publications (1)

Publication Number Publication Date
EP2596221A2 true EP2596221A2 (fr) 2013-05-29

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EP11730615.9A Withdrawn EP2596221A2 (fr) 2010-07-20 2011-06-27 Procédé de détermination d'une caractéristique pour une soupape de régulation de pression

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US (1) US9057347B2 (fr)
EP (1) EP2596221A2 (fr)
CN (1) CN102985671B (fr)
DE (1) DE102010031570B4 (fr)
WO (1) WO2012010383A2 (fr)

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Also Published As

Publication number Publication date
US9057347B2 (en) 2015-06-16
CN102985671A (zh) 2013-03-20
DE102010031570B4 (de) 2021-11-25
US20130180597A1 (en) 2013-07-18
DE102010031570A1 (de) 2012-01-26
CN102985671B (zh) 2015-11-25
WO2012010383A3 (fr) 2012-03-15
WO2012010383A2 (fr) 2012-01-26

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