EP1167729B1 - Piezoelektrischer Aktor eines Einspritzventils - Google Patents
Piezoelektrischer Aktor eines Einspritzventils Download PDFInfo
- Publication number
- EP1167729B1 EP1167729B1 EP00113992A EP00113992A EP1167729B1 EP 1167729 B1 EP1167729 B1 EP 1167729B1 EP 00113992 A EP00113992 A EP 00113992A EP 00113992 A EP00113992 A EP 00113992A EP 1167729 B1 EP1167729 B1 EP 1167729B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- terminal voltage
- voltage
- coupler
- fuel
- 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.)
- Expired - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 65
- 239000007924 injection Substances 0.000 claims description 65
- 239000000446 fuel Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 9
- 230000001419 dependent effect Effects 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 10
- 238000012544 monitoring process Methods 0.000 description 8
- 230000002123 temporal effect Effects 0.000 description 6
- 238000013500 data storage Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- F02D41/20—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
- 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
Definitions
- the invention relates to a method for operating a Injector for fuel in which a piezoelectric actuator via a hydraulic coupler a Closing member drives. It continues to refer to one Fuel injection system with a number of such Injectors.
- a fuel injection system As an essential ingredient can in one Internal combustion engine for introducing the fuel into the combustion chambers of the cylinder a fuel injection system be used.
- a fuel injection system usually includes a number of injectors, the individually or in the manner of a so-called common-rail system (CR systems) via a central Supply system are fueled with fuel.
- CR systems common-rail system
- each injector is usually in a respective associated injection valve integrated over the fuel injection in a predetermined manner is adjustable.
- the injection valves can be used for an electrical Control be provided with a piezoelectric actuator.
- Such injection valve for the Fuel injection into the combustion chamber of a Internal combustion engine with a high pressure system or CR system is known from DE 197 328 02.
- This injector is designed in a double-switching manner and has a Closure member, which is in one of two alternative Valve seats are each located in a closed position and thereby causing the injector to close. In a Middle position between the two valve seats takes that Closing member, however, an opening position.
- the Closing member via a piezoelectric actuator drivable.
- the piezoelectric Actuator charged to a drive voltage from the pressure in Common rail system is dependent. Due to the Drive voltage expands the actuator in the longitudinal direction. This length expansion is via a hydraulic coupler transferred to the closure member, so that on the one hand the amplified by the actuator hub is amplified and on the other hand the Closing member of a possible static Temperature expansion of the actuator is decoupled.
- a charge of the piezoelectric actuator thus causes via the hydraulic coupler a transfer of Verschgresgliedes first from the first closed position in the Opening position and then from the opening position in the second closed position.
- a discharge of the piezoelectric actuator due to the associated Contraction in the longitudinal direction via the hydraulic coupler a transfer of Verschnovgliedes first of the second closed position in the open position and then from the open position to the first closed position.
- the invention is therefore based on the object, a method for operating a fuel injection system with a Number of injectors, each with a piezoelectric actuator via a hydraulic coupler a Closing member drives to specify with the one particular reliable fuel injection is guaranteed. moreover should be one for the implementation of the procedure especially appropriate fuel injection system can be specified.
- this object is achieved according to the invention solved by after a charging process of an actuator whose Terminal voltage monitored and used to form a Diagnostic statement used for the respective injection valve is, with the diagnosis statement based on the temporal decline the terminal voltage after completion of the charging process is formed.
- the invention is based on the consideration that the Fuel injection system in terms of Fuel injection operated particularly reliable can be done by providing direct and timely monitoring of the Valve lift the injectors is made. This will be promptly, that is, during or immediately after the current one Injection cycle, one for each injector Diagnosis statement made regarding its valve lift. Like yourself Surprisingly enough, this can be done as appropriate parameters on the basis of which Diagnosis statement is formed, the temporal evolution of the Terminal voltage of the respective actuator may be provided.
- the loading phase namely, builds in the hydraulic Coupler a pressure on, which also after completion of the Recharging acts on the piezoelectric actuator and in this case with disconnected power supply one for the Pressure conditions in the coupler and consequently also for the Implementation of the drive voltage in valve lift characteristic piezo voltage generated.
- the Terminal voltage on the piezoelectric actuator can thus without the requirement of a further sensor as a measurement parameter for the valve behavior with regard to the implementation of Control voltage can be used in Ventilhub.
- the monitored terminal voltage for Formation of a diagnostic statement about the level of the Coupler of the respective injection valve used is unchanged held further external conditions - depending on the Coupler located medium; in particular results in a only partial filling of the coupler with fuel (effective medium: fuel-air mixture) in others Pressure conditions as a complete filling of the Coupler with fuel as a medium.
- the for the Pressure conditions in the coupler characteristic Terminal voltage particularly favorable for the Fill level monitoring can be used.
- a particularly reliable diagnostic statement is included achievable by these advantageously based on the temporal drop in terminal voltage after termination of the Charging process is formed.
- the pressure builds in the hydraulic coupler due to outflowing medium again from; this pressure drop is about monitoring the Terminal voltage at the actuator in the form of a function of Time occurring voltage reduction detectable.
- These Voltage reduction depends to a great extent from the degree of filling in the coupler: with a fully filled coupler is a comparatively pronounced voltage dip detectable.
- this effect is only partial filled coupler significantly lower, since in this case when charging only air or an air-fuel mixture was compressed.
- the diagnosis statement is based on a comparison of the difference from a first measured value for the terminal voltage immediately after the end of the Charging and a second reading for the Terminal voltage after expiry of a waiting time with a Limit formed.
- the waiting time can be a solid Value of advantageously be given about 0.25 ms.
- the waiting time but also depending on parameters characteristic of the injection cycle, such as For example, the driving time or the duration of a Splash break between two injections can be selected.
- the waiting time can be chosen such that the second measured value immediately before a following Control intervention, such as an increase in Drive voltage, is determined.
- the diagnosis statement is made directly for a correction intervention in the fuel injection system used. This is especially in finding a simple error based on the diagnostic statement a setpoint for the drive voltage of the respective actuator for a predetermined injection cycle, wherein the setpoint chosen so that, despite the noted not sufficient filling of the coupler after activation of the provided valve lift results.
- the advantages achieved by the invention are in particular in that by evaluating the terminal voltage on simple way and without additional design effort a timely and reliable diagnosis and Function monitoring of each individual injection valve is possible.
- the fuel injection system can thus especially reliable operated, with minor deviations corrective action immediately, for example with regard to a Tracking the drive voltage for each actuator, can be made.
- the injection valve 1 of Figure 1 has a piezoelectric actuator 2, which has a number of comprises piezoelectric elements 4 connected in series.
- the Actuator 2 is on the one hand with a housing wall 6 through which Terminals 7 of the actuator 2 are passed, and on the other hand with a servo piston 8 frictionally connected.
- the actuating piston 8 closes with its from the actuator. 2 facing away from face 9 a hydraulic coupler 10 from.
- the hydraulic coupler 10 in turn acts on a in a connecting channel 12 guided actuator piston 14, on whose end facing away from the coupler 10 end a closing member 16 is arranged.
- This is as double-closing Control valve formed. It closes in a first Closed position, the rest position of the actuator. 2 corresponds to a first valve seat 18 of a valve chamber 20. In a second closed position, the maximum Actuation of the actuator 2 corresponds closes the Closing member 16, however, a second valve seat 22 of the Valve chamber 20.
- Valve chamber 20 connected to a guide channel 24, the On the input side via a connecting piece 26 to a not illustrated pressure channel of a common rail fuel supply system of a motor vehicle connected.
- a nozzle needle 28 arranged, which has a fuel spout 30 of the Connecting piece 26 branching fuel channel 32 dependent from one via the terminals 7 to the actuator. 2 applied drive voltage Ua releases or closes.
- the injection valve 1 is, together with others Injectors 1, part of a fuel injection system 40, as shown schematically in Figure 2. there are the injection valves 1, of which in FIG For clarity, only four are shown, Fuel side to a common supply line 42nd connected.
- the number of for the Fuel injection system 40 provided injectors depends on the further requirements of the supplying internal combustion engine, in particular, a Injector 1 for each cylinder to be fed be provided.
- a central Control unit 44 For electrical control of the injectors 1 includes the fuel supply system 40 a central Control unit 44. This in turn has a control module 46th on, via lines 48 to the terminals 7 of the Injectors 1 is connected switched off. Farther the control unit 44 comprises a diagnostic unit 50 which a number of the injectors 1 respectively assigned and connected to their terminals 7 Voltage measuring 52 is connected. In addition, points the control unit 44 has a data storage module 54.
- a high pressure which at a Common rail system, for example, between 200 and 1800 bar can amount. This pressure acts against the nozzle needle 28 and keeps it closed so that through the fuel spill 30 no fuel can escape. But if now as a result of applied to the actuator 2 control voltage Ua the Closing member 16 from the first valve seat 18 to the second Valve seat 22 or vice versa is moved, then the builds Pressure in the high pressure region of the guide channel 24 from, so that the nozzle needle 28 in the direction of the valve chamber 20th recedes and releases the fuel outlet 30. In In this case, a fuel injection takes place in the associated cylinder.
- the determined difference of the terminal voltages Uk is less than the limit value, so as a diagnosis to a Inadequate refilling of the coupler 10 is closed.
- another comparison of the difference of Terminal voltages Uk with a second limit or Minimum value made.
- This comparison is still a distinction according to the effects of the error made: falls below the difference of Terminal voltages Uk also the second, even lower Limit value or minimum value, then a "fatal error" diagnosed, for example, an immediate shutdown of the internal combustion engine triggers. Is the difference of Although terminal voltages Uk below the first, but above the second limit, it becomes easier Error diagnosed, although the continued operation of the Internal combustion engine allowed, but for later Diagnostic purposes in the data storage module 54 is deposited.
- Upon detection of a simple error in the Diagnostic unit 50 is also a setpoint for the Drive voltage Ua of the respective actuator 2 for a predetermined injection cycle, wherein the setpoint chosen so that, despite the noted not sufficient filling of the coupler 10 after a Activation of the proposed valve results.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- Figur 1
- ein Einspritzventil eines Kraftstoffeinspritzsystems,
- Figur 2
- schematisch ein Kraftstoffeinspritzsystem mit einer Anzahl von Einspritzventilen nach Figur 1, und
- Figuren 3a und 3b
- jeweils ein Zeitdiagramm für eine Klemmenspannung.
Claims (9)
- Verfahren zum Betreiben eines Kraftstoffeinspritzsystems (40) mit einer Anzahl von Einspritzventilen (1), bei denen jeweils ein piezoelektrischer Aktor (2) über einen hydraulischen Koppler (10) ein Verschließglied (16) treibt, wobei nach einem Aufladevorgang eines Aktors (2) dessen Klemmenspannung (Uk) überwacht und zur Bildung einer Diagnoseaussage für das jeweilige Einspritzventil (1) herangezogen wird, und wobei die Diagnoseaussage anhand des zeitlichen Abfalls der Klemmenspannung (Uk) nach Beendigung des Aufladevorgangs gebildet wird.
- Verfahren nach Anspruch 1, bei dem anhand der überwachten Klemmenspannung (Uk) eine Diagnoseaussage über den Füllstand des Kopplers (10) des jeweiligen Einspritzventils (1) gebildet wird.
- Verfahren nach Anspruch 2, bei dem die Differenz zwischen der unmittelbar nach Beendigung des Aufladevorgangs gemessenen Klemmenspannung (Uk) und der nach Ablauf einer vorgebbaren Wartezeit gemessenen Klemmenspannung (Uk) mit einem Grenzwert verglichen wird.
- Verfahren nach Anspruch 3, bei dem in Abhängigkeit von der Differenz zwischen der unmittelbar nach Beendigung des Aufladevorgangs gemessenen Klemmenspannung (Uk) und der nach Ablauf einer vorgebbaren Wartezeit gemessenen Klemmenspannung (Uk) ein Sollwert für die Ansteuerspannung (Ua) des jeweiligen Aktors (2) für einen nachfolgenden Einspritzzyklus vorgegeben wird.
- Verfahren nach Anspruch 3 oder 4, bei dem als Wartezeit eine Zeit von etwa 0,25 ms, gerechnet von der Beendigung des Aufladevorgangs an, gewählt wird.
- Verfahren nach einem der Ansprüche 3 bis 5, bei dem als Grenzwert ein fester Spannungswert von etwa 25 bis 30 V vorgegeben wird.
- Verfahren nach einem der Ansprüche 3 bis 5, bei dem als Grenzwert ein betriebspunktabhängiger Spannungswert vorgegeben wird, der aus einem anhand einer vorherigen Eichung ermittelten Kennfeld abgeleitet wird.
- Kraftstoffeinspritzsystem (40) mit einer Anzahl von Einspritzventilen (1), bei denen jeweils ein piezoelektrischer Aktor (2) über einen hydraulischen Koppler (10) ein Verschließglied (16) treibt, wobei der Aktor (2) jedes Einspritzventils (1) mit einer zugeordneten Spannungsmesseinrichtung (52) verbunden ist, die ihrerseits ausgangsseitig an eine Diagnoseeinheit (50) angeschlossen ist und wobei Mittel vorgesehen sind, die eine Diagnoseaussage für das jeweilige Einspritzventil (1) anhand eines zeitlichen Abfalls einer Klemmenspannung (Uk) des Aktors (2) nach Beendigung eines Aufladevorgangs des Aktors (2) bilden.
- Kraftstoffeinspritzsystem (40) nach Anspruch 8, dessen Diagnoseeinheit (50) mit einem Datenspeichermodul (54) verbunden ist.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50009866T DE50009866D1 (de) | 2000-07-01 | 2000-07-01 | Piezoelektrischer Aktor eines Einspritzventils |
EP00113992A EP1167729B2 (de) | 2000-07-01 | 2000-07-01 | Piezoelektrischer Aktor eines Einspritzventils |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00113992A EP1167729B2 (de) | 2000-07-01 | 2000-07-01 | Piezoelektrischer Aktor eines Einspritzventils |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1167729A1 EP1167729A1 (de) | 2002-01-02 |
EP1167729B1 true EP1167729B1 (de) | 2005-03-23 |
EP1167729B2 EP1167729B2 (de) | 2009-09-09 |
Family
ID=8169130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00113992A Expired - Lifetime EP1167729B2 (de) | 2000-07-01 | 2000-07-01 | Piezoelektrischer Aktor eines Einspritzventils |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1167729B2 (de) |
DE (1) | DE50009866D1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11867314B2 (en) | 2018-05-31 | 2024-01-09 | Fas Medic S.A. | Method and apparatus for energising a solenoid of a valve assembly |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10239614A1 (de) | 2002-08-29 | 2004-03-11 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems und Brennkraftmaschine |
DE10336639A1 (de) * | 2003-08-08 | 2005-03-03 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Funktionsdiagnose eines Piezoaktors eines Kraftstoffzumesssystems einer Brennkraftmaschine |
DE10349824A1 (de) * | 2003-10-24 | 2005-06-02 | Robert Bosch Gmbh | Verfahren zur Diagnose einer Kraftstoff-Einspritzvorrichtung, welche einen Piezoaktor aufweist |
DE102004007798A1 (de) * | 2004-02-18 | 2005-09-08 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Bestimmen der Ladeflanken eines piezoelektrischen Aktors |
EP1746318B1 (de) * | 2005-07-22 | 2007-11-14 | Delphi Technologies, Inc. | Verfahren und Vorrichtung zum Überwachen und Beurteilen der Funktion eines piezoelektrischen Aktors |
ES2294608T3 (es) * | 2005-08-04 | 2008-04-01 | Delphi Technologies, Inc. | Procedimiento y dispositivo para vigilar y evaluar el funcionammiento de un actuador piezoelectrico. |
EP1860312B1 (de) * | 2006-05-23 | 2009-03-18 | Delphi Technologies, Inc. | Verfahren zum Betrieb einer Kraftstoffeinspritzdüse |
DE102008027516B3 (de) | 2008-06-10 | 2010-04-01 | Continental Automotive Gmbh | Verfahren zur Einspritzmengenabweichungsdetektion und zur Korrektur einer Einspritzmenge sowie Einspritzsystem |
DE102015208436B4 (de) * | 2015-05-06 | 2019-09-05 | Continental Automotive Gmbh | Überwachungsverfahren und Überwachungsvorrichtung zur Überwachung eines Füllvorgangs einer Injektoranordnung mit einem Kraftstoff und Befüllungsverfahren zum Befüllen einer Injektoranordnung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999067527A2 (de) * | 1998-06-25 | 1999-12-29 | Siemens Aktiengesellschaft | Verfahren und anordnung zum steuern eines kapazitiven aktors |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2707804B2 (ja) † | 1990-06-18 | 1998-02-04 | トヨタ自動車株式会社 | 圧電素子の駆動装置 |
DE19711903C2 (de) * | 1997-03-21 | 1999-03-18 | Siemens Ag | Vorrichtung und Verfahren zum Ansteuern eines piezogesteuerten Kraftstoffeinspritzventils |
DE19732802A1 (de) | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19733560B4 (de) * | 1997-08-02 | 2007-04-05 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements |
DE19804196A1 (de) * | 1998-02-03 | 1999-08-12 | Siemens Ag | Verfahren zur Auswertung von Kennwerten piezo-mechanischer Systeme |
US6420817B1 (en) † | 2000-02-11 | 2002-07-16 | Delphi Technologies, Inc. | Method for detecting injection events in a piezoelectric actuated fuel injector |
-
2000
- 2000-07-01 DE DE50009866T patent/DE50009866D1/de not_active Expired - Lifetime
- 2000-07-01 EP EP00113992A patent/EP1167729B2/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999067527A2 (de) * | 1998-06-25 | 1999-12-29 | Siemens Aktiengesellschaft | Verfahren und anordnung zum steuern eines kapazitiven aktors |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11867314B2 (en) | 2018-05-31 | 2024-01-09 | Fas Medic S.A. | Method and apparatus for energising a solenoid of a valve assembly |
Also Published As
Publication number | Publication date |
---|---|
EP1167729B2 (de) | 2009-09-09 |
DE50009866D1 (de) | 2005-04-28 |
EP1167729A1 (de) | 2002-01-02 |
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