EP1394397A2 - Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems - Google Patents
Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems Download PDFInfo
- Publication number
- EP1394397A2 EP1394397A2 EP03014503A EP03014503A EP1394397A2 EP 1394397 A2 EP1394397 A2 EP 1394397A2 EP 03014503 A EP03014503 A EP 03014503A EP 03014503 A EP03014503 A EP 03014503A EP 1394397 A2 EP1394397 A2 EP 1394397A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- actuator
- coupler
- injection
- leakage
- 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- Withdrawn
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 23
- 230000033228 biological regulation Effects 0.000 title description 2
- 238000002347 injection Methods 0.000 claims abstract description 81
- 239000007924 injection Substances 0.000 claims abstract description 81
- 239000000446 fuel Substances 0.000 claims abstract description 45
- 230000008859 change Effects 0.000 claims abstract description 12
- 238000004590 computer program Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000036316 preload Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000007103 stamina Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 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
- F02D41/22—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
- 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
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
-
- 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
- F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
-
- 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
- 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
- F02D2041/225—Leakage detection
-
- 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
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive 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
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/05—Miscellaneous constructional elements; Leakage detection
-
- 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
Definitions
- the invention relates on the one hand to a method for Operating a fuel injection system with a number of injectors, each with a piezoelectric actuator a closure element over a hydraulic coupler drives.
- Invention a computer program and a control and / or Control device for operating a fuel injection system and an internal combustion engine.
- Fuel injection system As an integral part in a Internal combustion engine for introducing the fuel into the combustion chambers of the cylinders Fuel injection system are used. On such a fuel injection system usually comprises a number of injectors, individually or too in the manner of a so-called common rail system central supply system are fueled. In both embodiments, each injector is usually in an associated injector integrated, through which the fuel injection in one predeterminable way is adjustable.
- the injectors can use an electrical Provide control with a piezoelectric actuator his.
- Such an injector for the Fuel injection into the combustion chamber Internal combustion engine with a high pressure system or Common rail system is known from DE 197 38 802.
- This The injection valve is designed in a double-switching manner and has a closure member that is in one of two alternative valve seats in one Is in the closed position and thereby closing the Injector causes. In a middle position between the however, the closure member takes one of the two valve seats Open position.
- a piezoelectric actuator drivable.
- the piezoelectric actuator is opened, for example a drive voltage charged by the pressure in the common rail system is dependent. Because of the control voltage the actuator expands in the longitudinal direction. This Linear expansion is based on a hydraulic coupler transferred the closure member, so that on the one hand the from Actuator-generated stroke is amplified and the other hand Closure member of a possible static Thermal expansion of the actuator is decoupled.
- a Charging the piezoelectric actuator thus causes over the hydraulic coupler a transfer of the Closing member initially from the first closed position to the open position and then from the open position in the second closed position.
- the result refilling after an injection depending on amount of fuel to be refilled and available Time interval may be different.
- a check on possible incorrect or non-filling is not there intended.
- An inadequate or insufficient Refilled coupler can therefore only indirectly via Errors due to faulty injections such as Speed fluctuations can be determined without a clear assignment to the cause of the error would be possible.
- a method of the type mentioned at the outset is, for example, from EP 1 167 729 A1 known.
- a Fuel injection system with a piezoelectric actuator described, after a charging process of the actuator whose terminal voltage is monitored and to form a Diagnostic statement for the respective injection valve is used.
- This is said to be a special one reliable fuel injection can be guaranteed.
- to direct and timely monitoring of the valve lift of the Injectors should be one after the injection cycle Diagnostic statement are made. This can be done as suitable parameter the terminal voltage of the respective Actuator are used.
- piezo actuators work via a hydraulic one Coupler on a control valve, which via a hydraulic control circuit ultimately the nozzle needle actuated.
- the hydraulic coupler is used on the one hand to increase the stroke and on the other hand to decouple of the control valve from the temperature expansion of the actuator. In order for the coupler to work safely, this one must have a certain amount of hydraulic fluid.
- the coupler space is filled via the Valve chamber, a pressure divider pin and a piston.
- the Pressure divider pin is from top to bottom flows through. There is pressure at the bottom, which reduces by a factor of 10 over the pin length becomes.
- Hydraulic fluid is used through the leakage gaps from this pushed out.
- the leakage is determined by the diameter of the pen and is independent of the quality of the coupler. I.e. even with a bad one
- the coupler's pressure retention capacity remains the leak constant as long as the pin diameter remains constant.
- the functionality of the control valve is therefore in Essentially depending on the gap geometry between the Piston and the housing. If this increases, it is Pressure retention worse, d. H. it will be higher Forces required to hold a closed position.
- the sealing element here the piston, in an upper one closed seat or top voltage level must ensure that the declining coupler force due to the leak is always greater than the force that by the rail pressure on the sealing element in the upper closed seat is caused. If this is not the case, the sealing element detaches from the closed seat and it comes to the unwanted injection.
- the current state of the art for double switching valves provides between the end event a pre-injection and the start event one Main injection in the upper closed position drive.
- the distance between End Event and Begin event kept constant over time.
- the setpoint for the coupler force that the coupler as a function of Rail pressure in the upper closed seat is designed to ensure that the Piston in the upper closed seat at maximum time interval between the two injections is guaranteed.
- Coupler leakage through a voltage level controller be balanced. Due to a maximum possible However, the voltage of the DC / DC converter used for this is with increased coupler leakage due to aging or Errors in leakage compensation quickly set limits.
- the invention is therefore based on the object Method of operating a fuel injection system with a number of injectors, each of which a piezoelectric actuator over a closure element drives a hydraulic coupler to specify in which reliable statements about the amount of leakage are made can.
- the invention solves this problem by a method of type mentioned in which in at least one Closure position of the closure element at which one Actuator voltage of the actuator is> 0, the course of the Actuator voltage is monitored and from the course of the Actuator voltage, on their relationship with the Preload and thus the pressure change in the hydraulic Coupler for a leak in the area of the coupler is closed.
- the coupler leakage that occurs is caused by the invention due to aging and other faults that cause one Geometry change of the gap between the piston and Housing is created, monitored. It can be done this way Conditions are recognized in which due to the existing Coupler leakage is not a safe operation of the injector more secure in one or possibly two locking positions is possible. An unwanted injection due to a Opening of the valve should be prevented.
- the control curve of a control valve can then either on a safe mode of operation in the secure closing is guaranteed to be changed or the actuator in question can no longer be activated become, d. H. in the simplest case, it is unloaded.
- the injector has a double switching valve a first upper locking position and a second lower closure position, the upper Closure position closer to the nozzle Fuel injection and at least one open Position between the two shutter positions lies and with the course of the actuator voltage in the upper Lock position is monitored. Basically you can also different open positions between the two Locking positions are provided which are approached can.
- the Actuator voltage determined values for the leakage of the Coupler with limit values are compared, being for the Limit value acquisition, for example a triggered ADC (analog-digital converter) can be used.
- ADC analog-digital converter
- the threshold can be designed such that the the closure element remains securely in the closed position upper seat at maximum time between two Injections is guaranteed. Will this threshold of the amount of leakage is exceeded, a Switchover of operation in the manner described above. A another last (hard) threshold signals another inadmissible increase in the amount of coupler leakage or a the injector is no longer safe to operate. In this case the loaded actuator should discharge and no more can be controlled.
- the actuator voltage should be between the end event of an injection and the start event of the next injection if possible be scanned continuously, but at least twice to filter out disturbances and / or vibrations. So can be provided, for example, that the actuator voltage at the end Event of a pre-injection and before the start event of the next injection, for example the main injection becomes. This is due to the wait for the transient process the actuator voltage after an event and in the Measuring events in close succession.
- the Piezo actuator works in addition to its actuator function as a sensor.
- the invention comprises a computer program for Carrying out a method described above, if it is running on a computer and in particular if it is on a memory, especially a flash memory, is saved.
- a comparator and one Digital-Analog Converter can do the same be implemented in terms of hardware because the high-frequency Scanning the microcomputer charged.
- the time is known to be unloaded because the computer does the Unloading actively controls.
- the invention further includes a control and / or Control device for operating a fuel injection system with a number of injectors, being one Includes memory on which a previously described Computer program is stored.
- the subject of the invention is a Internal combustion engine, with a combustion chamber, with a number of injectors, each with a piezoelectric actuator a closure element over a hydraulic coupler drives, the internal combustion engine a control and / or regulating device described above includes.
- Fig. 1 shows an internal combustion engine, the total with the Reference number 10 is provided.
- the internal combustion engine 10 comprises a combustion chamber 12 into which fresh air is supplied via a Inlet valve 14 and an intake pipe 16 is introduced.
- the exhaust gases resulting from the combustion are over a Exhaust valve 18 and an exhaust pipe 20 from the combustion chamber dissipated and fed to the exhaust gas treatment.
- the fuel is fed into the combustion chamber 12 directly through a Injector 22 introduced so that mixing of the Fuel with fresh air only takes place in the combustion chamber 12.
- the injector in this case comprises a piezo actuator 24 which is in Fig. 2 is described in more detail.
- the control and regulation the fuel injection takes place via a control and Control device 26.
- the injector By means of the injector, the fuel introduced into the combustion chamber 12 at high pressure.
- the Fuel is transferred from a fuel reservoir 28 a fuel line 29 is fed into the injector 22.
- VE 1 and VE 2 and HE injections are provided per work cycle, for example two pre-injections and one main injection, which will later be referred to as VE 1 and VE 2 and HE and which will be discussed in FIG. 6.
- the Piezo actuator 24 includes one piezoelectric actuator 24 with a number of Piezo elements 24n connected in series.
- the Piezo actuator 24 is connected to a housing on the one hand, with 32 the terminals for charging the Piezo actuator 24 are marked and it stands on the other side with an actuating piston 34 in connection.
- the Actuating piston closes with its from the piezoelectric actuator 24 facing away from a coupler space 36 a hydraulic coupler.
- a second actuating piston 38 in a connecting channel 39 between the coupler space 36 and a switching valve space 40 guided, the one on its side facing away from the coupler room 36 Side is connected to a sealing element. This Sealing element doubles as a closure element 42 closing control valve.
- the double closing Control valve closes in its first Closure position 40a a first valve seat, which also as the upper closed position (voltage level) is referred to, this closure position one corresponds to the maximum control of the actuator.
- this closure position one corresponds to the maximum control of the actuator.
- the second closed position closes the Closure element 42 a lower closure position, wherein it in this case against a lower valve seat 40b that is located closer to the actuator.
- Valve chamber 40 Via a passage in the first valve seat 40a Valve chamber 40 connected to a channel 44, which via a Connector 46 to a not shown Fuel supply system with one High pressure fuel supply for a motor vehicle connected.
- a nozzle needle 48 is located in the channel 44 arranged that a fuel outlet 50 one of the Connection piece 46 branching fuel channel 52 dependent from one via the connecting terminals 32 to the electrical Actuator 24 applied control voltage releases or closes.
- the injection valve 22 is thus shared with others Injectors 22 part of a fuel injection system.
- the control unit 26 For fuel injection, the control unit 26 a control voltage to the in an injection cycle Terminals 32 of each injector 22 applied, the piezoelectric actuator 24 being dependent extends from this control voltage.
- the actuating piston 34 By the expansion of the piezoelectric actuator 24, the actuating piston 34 in Moved towards the hydraulic coupler space 36.
- About the fuel supply line 29 prevails in Connection piece 26 of an injection valve 22 a high one Pressure that is, for example, between 200 in a common rail system and can be 1,800 bar. This pressure works against the Nozzle needle 48 and keeps it closed, so that through the Fuel outlet 50 no fuel can leak.
- the coupling space 36 is filled via the Valve space 40, which is connected to the coupler space via a channel 54 36 is in contact in the area of the connecting channel 39, wherein a pressure divider pin is disposed in the channel 54.
- a pressure divider pin is disposed in the channel 54.
- Pressure control valve for example, a "ball-spring valve” can be used.
- the prevailing pressure in the coupler space 36 is uncontrolled a function of the pen length. The pen will from bottom to top, d. that is, from the valve space 40 to Flows through coupler space 36. This is at the bottom Rail pressure, which is about the factor over the pen length 10 is reduced.
- the leak is about the diameter of the pressure divider pin 56 set and depends on its diameter.
- the Leakage quantity is therefore independent of the quality of the Coupler. I.e. even with a bad one
- the coupler's pressure retention capacity remains the leak constant as long as the pin diameter remains constant. However, it may be due to aging or otherwise Errors come to a change in the gap geometry that Functionality of the hydraulic coupler is however in Essentially depending on the gap geometry between the Piston 38 and the housing in the region of the channel 39. If this gap increases, it worsens Pressure stamina. Leakage losses are over a Leakage return 56 discharged.
- the method according to the invention for a double-switching valve begins with a start block, with the piezo actuator 24 being loaded in block 59 after this block.
- the time counter is set to zero.
- the subsequent query checks whether the current point in time is the point in time at the end (end event) of an injection at which a top voltage level is present. (This can be both a pre-injection and a main injection, since some methods of injection control, for example, switch off the pre-injection at a speed of 3000 rpm.) If this is not the case, another time loop is run through and at a time t + 1 the Query started again. If this query is answered with "yes", a voltage U 1top is measured.
- the voltage drop is also greater than the second Limit value, another error entry is made in the block 60 in the error memory and there will be another query carried out, namely whether the voltage drop is even smaller or is a third limit.
- the Voltage drop less than or equal to the third limit, so the double-switching switching valve 22 is no longer driven in normal mode, but it will only the valve seat 40b approached, with a smaller one Actuator voltage is necessary and on the lower pressures Act.
- These first two thresholds are also called referred to as soft thresholds.
- the second limit is there designed so that the sealing element remains secure in the upper closed seat at a maximum time Distance between two injections in the Top voltage level can be guaranteed got to.
- the voltage drop is also greater than a third Limit that represents another (hard) threshold, see above is due to the impermissible increase in Coupler leakage amount of safe operation of the injector 22 no longer guaranteed. Another is done Error entry in block 64 and the actuator that is still loaded discharged. This third hard threshold is applicative designed that the reproducible and accurate control the injector is still guaranteed.
- the procedure is then finished and can be changed to a later one Time can be performed again. How often that Diagnostic procedures performed depend on the possible errors to be determined. Just the case the increase in the amount of coupler leakage due to aging then the top voltage level can only be recognized in certain time intervals, e.g. B. depending on Operating hours counter of the control unit 26 analyzed become.
- FIG. 4 shows an alternative embodiment in which the voltage values between the end event of an injection at the top voltage level, for example after an injection VE 1 and before the start event at the top voltage level of a main injection, for example, are measured continuously.
- t t end event in the top voltage level
- the time counter is not only increased further, but a voltage value U 1Top is measured.
- the query is made as to whether t t t Begin Event Top of the next injection and as long as this is the case, voltage values U 2 to U n are recorded.
- the time counter is increased by 1 after each voltage measurement and the query is started again whether t ⁇ t Begin Event Top . Only when this question is answered with "no", that is to say the point in time has become greater than t Begin Event Top , is there a next query, namely whether the integral over the top voltages is less than a first limit value. The subsequent process then proceeds as described in FIG. 3.
- FIG. 5a is the profile of the control voltage for the Piezo actuator 24 and the coupler force over the period of shown for approx. 4 ms.
- the illustration in Fig. 5a shows the values for two different injectors. So can be seen that the effect of the decreasing coupler force in the Top voltage level in the injector according to FIG. 5a stronger occurs because the seal is shorter here.
- the switch-off voltage In order to determine the voltage drop, the switch-off voltage must be known here, which is marked with * in FIG. 6a.
- the voltage increase results from the sensory properties of the piezo actuator and the "spring-mass" system, since the piezo ceramic is pretensioned with a spring.
- 6b shows the voltage curve for a simple switching valve with no top voltage level is approached.
- Fig. 7 shows a continuous measurement of the Voltage via an ADC trigger on the bottom line indicated by the vertical arrows and with the solid line a normal voltage drop due to the normal leakage of the coupler and with the Dashed line the voltage drop as he occurs with an impermissibly high coupler leakage.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
- Figur 1
- eine schematische Darstellung einer Brennkraftmaschine mit einem Injektor, welcher einen Piezoaktor umfasst,
- Figur 2
- ein Einspritzventil eines Kraftstoffeinspritzsystems mit einem Piezoaktor,
- Figur 3
- ein Ablaufdiagramm eines Verfahrens zum Betreiben eines Kraftstoffeinspritzsystems,
- Figur 4
- eine alternative Ausgestaltung des Verfahrens,
- Figuren 5a, 5b
- Zeitdiagramme für die Ansteuerungsspannung sowie die Kopplerkraft,
- Figuren 6a, 6b
- Zeitdiagramme der Ansteuerspannung sowie der Einspritzung für ein doppelt schaltendes und ein einfach schaltendes Ventil,
- Figur 7
- ein Zeitdiagramm für eine Ansteuerspannung.
Claims (14)
- Verfahren zum Betreiben eines Kraftstoffeinspritzsystems mit einer Anzahl von Einspritzventilen, bei denen jeweils ein piezoelektrischer Aktor ein Verschlusselement über einen hydraulischen Koppler treibt, bei dem in mindestens einer Verschlussposition des Verschlusselementes, in der eine Aktorspannung > 0 ist, der Verlauf der Aktorspannung überwacht wird und aus dem Verlauf der Aktorspannung über deren Zusammenhang mit der Vorspannkraft und damit der Druckänderung im hydraulischen Koppler auf eine Leckage im Bereich des Kopplers geschlossen wird.
- Verfahren nach Anspruch 1, bei dem das Einspritzventil ein doppelschaltendes Ventil mit einer ersten oberen, näher an einer Düse zur Kraftstoffeinspritzung liegenden Verschlussposition und einer zweiten unteren, weiter von der Düse entfernt liegenden Verschlussposition ist sowie mindestens einer offenen Position, die zwischen den beiden Verschlusspositionen liegt und wobei der Verlauf der Aktorspannung in der oberen Verschlussposition überwacht wird.
- Verfahren nach Anspruch 1 oder 2, bei dem anhand der überwachten Aktorspannung eine Diagnoseaussage über den Füllstand des Kopplers des Einspritzventils gebildet wird.
- Verfahren nach einem der Ansprüche 1 bis 3, bei dem die aus der Aktorspannung ermittelte Leckage des Kopplers mit Grenzwerten verglichen wird.
- Verfahren nach Anspruch 4, bei dem bei Überschreiten eines Grenzwertes der Leckage der Raildruck abgesenkt wird.
- Verfahren nach Anspruch 4 oder 5, bei dem bei Überschreiten eines Grenzwertes der Leckage die Aktorspannung erhöht wird.
- Verfahren nach einem der Ansprüche 4 bis 6, bei dem bei Überschreiten eines Grenzwertes der Leckage des Kopplers ein Betrieb des doppelt schaltenden Ventils derart umgeschaltet wird, dass die überwachte erste obere Verschlussposition nicht mehr angefahren wird.
- Verfahren nach einem der Ansprüche 4 bis 7, bei dem bei Überschreiten eines Grenzwertes der Leckage das Einspritzventil abgeschaltet und der Piezo-Aktor entladen wird.
- Verfahren nach einem der vorangehenden Ansprüche, bei dem der Spannungsverlauf des Piezo-Aktors zwischen dem Ende einer ersten Einspritzung und dem Beginn einer zweiten Einspritzung in bestimmten diskreten Abständen, mindestens jedoch zwei mal abgetastet wird.
- Verfahren nach einem der vorangehenden Ansprüche 1 bis 9, bei dem der Spannungsverlauf des Piezo-Aktors zwischen dem Ende einer ersten Einspritzung und dem Beginn einer zweiten Einspritzung kontinuierlich abgetastet wird.
- Computerprogramm, das zur Durchführung des Verfahrens nach einem der vorangehenden Ansprüche geeignet ist, wenn es auf einem Computer ausgeführt wird.
- Computerprogramm nach Anspruch 11, das auf einem Speicher, insbesondere einem Flash-Memory abgespeichert ist.
- Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems mit einer Anzahl von Einspritzventilen (22), wobei es einen Speicher umfasst, auf dem ein Computerprogramm nach einem der Ansprüche 11 oder 12 abgespeichert ist.
- Brennkraftmaschine, mit einem Brennraum (12), mit einer Anzahl von Einspritzventilen (22), bei denen jeweils ein piezoelektrischer Aktor (24) ein Verschlusselement (42) über einen hydraulischen Koppler (36) treibt, die ein Steuer- und/oder Regelgerät (26) nach Anspruch 13 umfasst.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10239614A DE10239614A1 (de) | 2002-08-29 | 2002-08-29 | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems und Brennkraftmaschine |
DE10239614 | 2002-08-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1394397A2 true EP1394397A2 (de) | 2004-03-03 |
EP1394397A3 EP1394397A3 (de) | 2009-12-09 |
Family
ID=31197478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03014503A Withdrawn EP1394397A3 (de) | 2002-08-29 | 2003-07-03 | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1394397A3 (de) |
JP (1) | JP2004138048A (de) |
DE (1) | DE10239614A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010142488A1 (de) * | 2009-06-09 | 2010-12-16 | Robert Bosch Gmbh | Verfahren zum überwachen des betriebs eines injektors |
WO2015189059A1 (de) * | 2014-06-13 | 2015-12-17 | Continental Automotive Gmbh | Verfahren zur charakterisierung eines hydraulischen koppelelementes eines piezo-injektors |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19738802C1 (de) | 1997-09-05 | 1998-10-01 | Keiper Gmbh & Co | Befestigungsvorrichtung für Kindersitz |
DE19732802A1 (de) | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
EP1167729A1 (de) | 2000-07-01 | 2002-01-02 | Robert Bosch GmbH | Piezoelektrischer Aktor eines Einspritzventils |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000027725A (ja) * | 1998-07-08 | 2000-01-25 | Isuzu Motors Ltd | コモンレール式燃料噴射装置 |
DE10002270C1 (de) * | 2000-01-20 | 2001-06-28 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
-
2002
- 2002-08-29 DE DE10239614A patent/DE10239614A1/de not_active Withdrawn
-
2003
- 2003-07-03 EP EP03014503A patent/EP1394397A3/de not_active Withdrawn
- 2003-08-29 JP JP2003307296A patent/JP2004138048A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19732802A1 (de) | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19738802C1 (de) | 1997-09-05 | 1998-10-01 | Keiper Gmbh & Co | Befestigungsvorrichtung für Kindersitz |
EP1167729A1 (de) | 2000-07-01 | 2002-01-02 | Robert Bosch GmbH | Piezoelektrischer Aktor eines Einspritzventils |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010142488A1 (de) * | 2009-06-09 | 2010-12-16 | Robert Bosch Gmbh | Verfahren zum überwachen des betriebs eines injektors |
WO2015189059A1 (de) * | 2014-06-13 | 2015-12-17 | Continental Automotive Gmbh | Verfahren zur charakterisierung eines hydraulischen koppelelementes eines piezo-injektors |
US10018138B2 (en) | 2014-06-13 | 2018-07-10 | Continental Automotive Gmbh | Method for operating a piezo injector |
Also Published As
Publication number | Publication date |
---|---|
JP2004138048A (ja) | 2004-05-13 |
EP1394397A3 (de) | 2009-12-09 |
DE10239614A1 (de) | 2004-03-11 |
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