WO2009010374A1 - Verfahren und vorrichtung zur formung eines elektrischen steuersignals für einen einspritzimpuls - Google Patents
Verfahren und vorrichtung zur formung eines elektrischen steuersignals für einen einspritzimpuls Download PDFInfo
- Publication number
- WO2009010374A1 WO2009010374A1 PCT/EP2008/058130 EP2008058130W WO2009010374A1 WO 2009010374 A1 WO2009010374 A1 WO 2009010374A1 EP 2008058130 W EP2008058130 W EP 2008058130W WO 2009010374 A1 WO2009010374 A1 WO 2009010374A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- injection
- fuel
- control signal
- injection rate
- fuel injector
- 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.)
- Ceased
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
- F02D41/20—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
- F02D41/20—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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
Definitions
- the invention relates to a method and a device for shaping an electrical control signal for an injection pulse of a position-controlled fuel injector of a common-rail or pump-nozzle injection system according to the genus of the independent claims 1 and 10.
- the piezoelectric actuator has the property that on the one hand it can very quickly convert an electrical signal into a mechanical lifting movement. Furthermore, the piezoelectric actuator has the property that it emits an electrical signal during a mechanical pressure load, so that it can also be used as a sensor for detecting the prevailing pressure in the fuel injector or in the injection system.
- a nozzle needle is controlled, can be opened with the spray holes within a nozzle unit more or less wide.
- the nozzle needle can thus be regulated to a specific, predetermined position with a corresponding shaping of an electrical control signal.
- Another problem is that the exact detection of the actually injected fuel quantity and the injection time point can only be solved unsatisfactorily so far.
- problems arise in that the fuel injectors used are manufactured with an unavoidable manufacturing tolerance, so that the exact detection of the actually injected fuel quantity has so far been solved only unsatisfactorily.
- the invention has for its object to provide a method and an apparatus with which the Kraftstoffeinsprit- tion is improved in a cylinder of an internal combustion engine with a view to optimizing the combustion process.
- the electrical control signal is first formed with an intermediate level with a lower amplitude, so that the nozzle needle of the
- Fuel injector is moved when opening the spray holes in an intermediate position. As a result, a first subset of the predetermined amount of fuel can be injected.
- the injection rate change is specified.
- Another degree of freedom for the first partial injection is also seen in that the holding time for the maintenance of the intermediate position of the fuel injector is specified.
- the injection rate change and / or the holding time for the intermediate position By varying the injection rate change and / or the holding time for the intermediate position, an almost arbitrary injection behavior can be generated and thereby the combustion of the fuel-air mixture in the cylinder of the internal combustion engine can be further optimized.
- the electrical control signal is set to a higher level with higher amplitude.
- the nozzle needle of the fuel injector is regulated to a second stop position, so that a second, higher level for the fuel injection is achieved.
- a second holding time is predetermined for the opening duration of the nozzle needle.
- Another aspect of the invention is that the number of intermediate levels, the holding period and / or the injection rate changes is arbitrary. This results in a very simple adaptation to any design of the injection process.
- the nozzle needle can be selectively intercepted when placed on their valve seat. This results in an advantageous manner an improved reproducibility of the metering of the amount of fuel and a reduction in noise. Furthermore, in conjunction with a lower combustion noise and the ride comfort is improved.
- FIGS. 1 A, B, C show three diagrams with the profile of the control current and the control voltage on the actuator and the temporal relationship with the injected fuel quantity
- FIG. 2 shows by way of example a second diagram with two control signals according to the invention
- FIG. 3 shows a schematic structure of a device according to the invention and FIG. 4 shows a block diagram of a device according to the invention.
- FIG. 1A shows the current I as a function of time t, which can be measured directly on a piezoelectric actuator.
- the piezoelectric actuator has a capacitive behavior, i. that a positive charging current flows into the actuator when the voltage is increased and a negative current flows when the voltage is lowered. If no voltage change, then the current flow goes back to 0.
- the piezoelectric actuator also has sensory properties.
- This vibration is caused, for example, by the impact of the nozzle needle on its valve seat.
- the fluctuations in the fuel pressure which is determined by opening or closing the spray holes of the injection nozzle.
- the vibration which is also referred to as Wegprellung be detected and controlled controlled.
- both an injection rate change as a rising edge of the electrical control signal and an amplitude with an intermediate level and / or a hold time can be specified as a freely selectable parameter. From the integral over the injection rate change as well as the holding time results in the actually injected fuel amount, as will be explained in more detail later.
- the voltage curve U at the piezoelectric actuator is recorded analogously to the current profile I.
- the voltage rises at time t 0 with a predetermined edge to an intermediate value of about 50 volts. After that, a longer hold time is applied until the voltage for
- the falling voltage edge corresponds in each case to a falling current at the piezoelectric actuator.
- FIGS. 1A and 1B Analogous to the two diagrams of FIGS. 1A and 1B, FIG. 1A
- the representation of the three diagrams takes place on a comparable time axis t in the range of 10 ⁇ 4 seconds.
- Control signal, the injection quantity Q and the injection rate Q are controlled. Furthermore, the seat throttling of the nozzle needle and its stability with respect to the injection rate can be advantageously influenced by a corresponding curve.
- Figure 2 shows a diagram with, for example, two inventive curves 1 and 2 for the formation of an electrical control signal.
- This diagram shows all the parameters that can influence an injection process.
- the injection rate (injection rate per unit of time) Q is plotted on the Y-axis in the diagram and the time t on the X-axis.
- Curves 1 and 2 are shown as examples of different control signals or different injection curves. Since the curves 1 and 2 have the same course schematically, only the curve 1 will be explained in more detail below. The curve 2, however, differs only in smaller amplitudes of
- Injection rate Q and lower injection rate changes Q.
- the curve 1 first increases from the value 0 until a first injection rate Q 1 is reached within the time period ti.
- the injection rate change has the value Q 1 . Subsequently, the injection rate Q 1 is kept constant during a holding time At 1 . Thereafter, within the period t2, the electrical control signal increases with an injection rate change Q 2 to the injection rate Q 2 . Thereafter, the injection rate Q 2 is kept constant during the period ⁇ t 2 . Subsequently, the curve 1 drops to the value 0 during the period ⁇ t 3 . For the falling edge, an injection rate change Q 3 is selected.
- This basic course for an inventive electrical control signal can be varied, as shown by way of example by curve 2. For the curve 2. For the curve 2. For the curve 2.
- An injection rate change Q j a time t i, an injection rate Q 1, a hold time At 1 .
- the parameters according to the invention are freely selectable.
- the electrical control signal is designed for further intermediate levels.
- the first subset increases within the time period ti to the injection rate Q ⁇ .
- the injection rate Q ⁇ is kept constant during the holding time At. 1
- the injection rate Q 2 is reached within the time period t 2 with an injection rate change Q 2 .
- the injection rate Q 2 remains constant during the dwell time ⁇ t 2 .
- the control signal drops to the value 0 during the time period ⁇ t 3 and with the injection rate change Q 3 .
- the total injection quantity can be calculated by integral formation over the entire curve.
- Essential to the invention is that a variation of the additional parameters does not affect the target total amount for the given fuel injection. For this purpose, it is particularly necessary that a transformation of the desired injection rates and their injection rate profiles is performed. It should also be taken into term that the electrical control parameters exert a corresponding influence on the hydraulic variables in Aktoruite. Taking into account all factors, it is possible to determine the actually injected fuel quantity accurately and reproducibly, so that the combustion process of the fuel-air mixture can be optimally controlled.
- the determination is dependent on the fuel injector type of a common rail or a pump-nozzle injection system.
- the injection rate change Q 3 and determination of system-related limit values result as a solution of a non-linear optimization with corresponding boundary conditions.
- Figures IA, IB which determine the loading, holding and unloading of an ideal nozzle needle driving path.
- the specification of charging duration and charge change per unit time determines an energy setpoint for a subsequent energy control loop. For each cylinder, an adaptation and equality of different efficiencies in the drive is taken into account individually.
- the pre-control value itself is tracked individually by suitable feedback signals from the injection system for each cylinder.
- This may be, for example, a model-based or a phenomenological detection of the start of injection, the time of reaching the full opening of the nozzle needle or the achieved injection rate itself.
- FIG. 3 shows a schematic representation of a device 10 with an algorithm with which a control function for an injection rate profile can be used to determine an electrical control signal.
- a control function for an injection rate profile can be used to determine an electrical control signal.
- Injection rate change a rate for a boat injection, and a hold time for the boat injection are inputted, latched, and prepared.
- the first unit 11 determines from the data entered the course of the electrical control signal see, with which the fuel injector is driven in order to achieve the desired hydraulic injection duration.
- the injection rate change, the boat injection rate, and the boat injection hold time are fed in parallel to a transformer 12 and converted accordingly.
- the input of the transformer 12 is at the same time as the output gang of the first unit 11 connected. From the input data, the transformer 12 determines a charge change per unit time, charging times and an injection duration. These data are available on the output side and are linked to the output data of a first control computer (controller) 13.
- the first control computer 13 is connected to a system feedback and provides corresponding specifications for the charge change per unit time and for the charging times.
- the results are fed to a second control computer 14. From the values received, the final charge change per unit time is determined and is available at an output. Furthermore, the second computer is connected to an energetic feedback.
- Figure 4 shows a schematic representation of an inventive device 10 for forming an electrical Steuersig- signal for an injection pulse of a position-controlled
- the fuel injector 2 is arranged on a cylinder head of a cylinder 6 of an internal combustion engine.
- the control unit 1 is connected via an electrical line 7 with a preferably piezoelectric actuator 3 of the fuel injector 2.
- the actuator 3 Upon actuation of the actuator 3 by an electrical control signal of the control unit 1, the actuator 3 actuates a nozzle needle, which is arranged within an injection nozzle 4.
- spray holes are rather opened or closed, which are located in the lower part of the injection nozzle 4.
- the fuel injector 2 is supplied with fuel via a fuel line 5.
Landscapes
- 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)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/669,129 US8365704B2 (en) | 2007-07-18 | 2008-06-26 | Method and device for forming an electric control signal for an injection impulse |
| KR1020107003618A KR101498875B1 (ko) | 2007-07-18 | 2008-06-26 | 분사 임펄스에 대한 전기 제어 신호 형성 장치 및 방법 |
| CN2008800251680A CN101755116B (zh) | 2007-07-18 | 2008-06-26 | 用于为喷射脉冲形成电控制信号的方法和装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007033469.0 | 2007-07-18 | ||
| DE102007033469.0A DE102007033469B4 (de) | 2007-07-18 | 2007-07-18 | Verfahren und Vorrichtung zur Formung eines elektrischen Steuersignals für einen Einspritzimpuls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009010374A1 true WO2009010374A1 (de) | 2009-01-22 |
Family
ID=39864933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/058130 Ceased WO2009010374A1 (de) | 2007-07-18 | 2008-06-26 | Verfahren und vorrichtung zur formung eines elektrischen steuersignals für einen einspritzimpuls |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8365704B2 (de) |
| KR (1) | KR101498875B1 (de) |
| CN (1) | CN101755116B (de) |
| DE (1) | DE102007033469B4 (de) |
| WO (1) | WO2009010374A1 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010040253A1 (de) | 2010-09-03 | 2012-03-08 | Continental Automotive Gmbh | Verfahren zur Überwachung des Zustandes eines Piezoinjektors eines Kraftstoffeinspritzsystems |
| DE102011004613A1 (de) | 2011-02-23 | 2012-08-23 | Continental Automotive Gmbh | Verfahren zur Überwachung des Zustandes eines Piezoinjektors eines Kraftstoffeinspritzsystems |
| DE102011005934A1 (de) | 2011-03-23 | 2012-09-27 | Continental Automotive Gmbh | Verfahren zur Ermittlung der Kraftverhältnisse an der Düsennadel eines direkt getriebenen Piezoinjektors |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010021169B4 (de) | 2010-05-21 | 2012-03-08 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Ermittlung des tatsächlichen Einspritzbeginns eines Piezo-Kraftstoff-Einspritzventils |
| DE102010022910B4 (de) | 2010-06-07 | 2017-09-21 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Betreiben eines Einspritzventils |
| DE102010040306B4 (de) | 2010-09-07 | 2020-06-25 | Continental Automotive Gmbh | Verfahren zur Ansteuerung eines Piezoinjektors eines Kraftstoffeinspritzsystems |
| DE102011082455B4 (de) * | 2011-09-09 | 2014-02-13 | Continental Automotive Gmbh | Verfahren zum Überwachen einer Einspritzmenge eines Fluids sowie Einspritzsystem zum Einspritzen einer Einspritzmenge eines Fluids |
| US9068815B1 (en) * | 2011-11-09 | 2015-06-30 | Sturman Industries, Inc. | Position sensors and methods |
| FR2990998B1 (fr) | 2012-05-23 | 2016-02-26 | Continental Automotive France | Procede de pilotage d'au moins un actionneur piezoelectrique d'injecteur de carburant d'un moteur a combustion interne |
| FR3002592B1 (fr) * | 2013-02-26 | 2016-09-16 | Continental Automotive France | Procede de pilotage d'un injecteur piezoelectrique de carburant d'un moteur a combustion interne de vehicule, comportant une etape de polarisation de l'actionneur piezoelectrique |
| DE102013214912A1 (de) * | 2013-07-30 | 2015-02-05 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Einspritzsystems |
| DE102020108816A1 (de) * | 2020-03-31 | 2021-09-30 | Liebherr-Components Deggendorf Gmbh | Kraftstoffinjektor |
| FR3112572B1 (fr) * | 2020-07-20 | 2022-06-17 | Vitesco Technologies | Dérive de débit statique d’un injecteur piézo-électrique |
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| DE10011711A1 (de) * | 2000-03-10 | 2001-10-04 | Daimler Chrysler Ag | Verfahren zum Einspritzen eines Kraftstoffs in einen Brennraum einer Brennkraftmaschine |
| WO2004038203A1 (de) * | 2002-10-22 | 2004-05-06 | Siemens Aktiengesellschaft | Verfahren zum aufladen eines piezoelektrischen aktors eines einspritzventils und steuergerät |
| DE102004006558B3 (de) * | 2004-02-10 | 2005-09-08 | Siemens Ag | Verfahren zur Ermittlung der benötigten Aktorenergie für die verschiedenen Einspritzarten eines Aktors einer Brennkraftmaschine |
| EP1607609A1 (de) * | 2004-06-15 | 2005-12-21 | C.R.F. Società Consortile per Azioni | Regelungssystem zur Regelung der Verbrennung in einem Dieselmotor mit vorgemischter Verbrennung |
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| JPS588237A (ja) * | 1981-07-06 | 1983-01-18 | Toyota Motor Corp | デイ−ゼルエンジンの制御方法 |
| JP3695046B2 (ja) * | 1997-02-07 | 2005-09-14 | いすゞ自動車株式会社 | エンジンの燃料噴射方法及びその装置 |
| DE19714607A1 (de) * | 1997-04-09 | 1998-10-15 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elements |
| DE19921456A1 (de) * | 1999-05-08 | 2000-11-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines piezoelektrischen Aktors |
| DE19939449A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Verfahren zum Steuern von Flüssigkeiten |
| DE10016476A1 (de) * | 2000-04-01 | 2001-12-06 | Bosch Gmbh Robert | Verfahren zur Diagnose der Spannungsansteuerung für einen piezoelektrischen Aktor eines Einspritzventils |
| EP1138912A1 (de) * | 2000-04-01 | 2001-10-04 | Robert Bosch GmbH | Online Optimierung eines Einspritzsystems mit piezolektrischen Elementen |
| DE10113670A1 (de) * | 2001-03-21 | 2002-09-26 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines Piezoaktors |
| DE10148217C1 (de) * | 2001-09-28 | 2003-04-24 | Bosch Gmbh Robert | Verfahren, Computerprogramm und Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschine, sowie Brennkraftmaschine |
| DE10155390A1 (de) * | 2001-11-10 | 2003-05-22 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Laden und Entladen eines piezoelektrischen Elementes |
| JP4515729B2 (ja) * | 2003-01-30 | 2010-08-04 | 株式会社デンソー | 燃料噴射装置 |
| DE10340975A1 (de) * | 2003-09-05 | 2005-03-31 | Robert Bosch Gmbh | Verfahren für die Steuerung eines Stellglieds |
-
2007
- 2007-07-18 DE DE102007033469.0A patent/DE102007033469B4/de not_active Expired - Fee Related
-
2008
- 2008-06-26 WO PCT/EP2008/058130 patent/WO2009010374A1/de not_active Ceased
- 2008-06-26 CN CN2008800251680A patent/CN101755116B/zh not_active Expired - Fee Related
- 2008-06-26 US US12/669,129 patent/US8365704B2/en not_active Expired - Fee Related
- 2008-06-26 KR KR1020107003618A patent/KR101498875B1/ko not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10011711A1 (de) * | 2000-03-10 | 2001-10-04 | Daimler Chrysler Ag | Verfahren zum Einspritzen eines Kraftstoffs in einen Brennraum einer Brennkraftmaschine |
| WO2004038203A1 (de) * | 2002-10-22 | 2004-05-06 | Siemens Aktiengesellschaft | Verfahren zum aufladen eines piezoelektrischen aktors eines einspritzventils und steuergerät |
| DE102004006558B3 (de) * | 2004-02-10 | 2005-09-08 | Siemens Ag | Verfahren zur Ermittlung der benötigten Aktorenergie für die verschiedenen Einspritzarten eines Aktors einer Brennkraftmaschine |
| EP1607609A1 (de) * | 2004-06-15 | 2005-12-21 | C.R.F. Società Consortile per Azioni | Regelungssystem zur Regelung der Verbrennung in einem Dieselmotor mit vorgemischter Verbrennung |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010040253A1 (de) | 2010-09-03 | 2012-03-08 | Continental Automotive Gmbh | Verfahren zur Überwachung des Zustandes eines Piezoinjektors eines Kraftstoffeinspritzsystems |
| DE102011004613A1 (de) | 2011-02-23 | 2012-08-23 | Continental Automotive Gmbh | Verfahren zur Überwachung des Zustandes eines Piezoinjektors eines Kraftstoffeinspritzsystems |
| WO2012113796A1 (de) | 2011-02-23 | 2012-08-30 | Continental Automotive Gmbh | Verfahren zur überwachung des zustandes eines piezoinjektors eines kraftstoffeinspritzsystems |
| US8875566B2 (en) | 2011-02-23 | 2014-11-04 | Continental Automotive Gmbh | Method for monitoring the state of a piezoelectric injector of a fuel injection system |
| DE102011005934A1 (de) | 2011-03-23 | 2012-09-27 | Continental Automotive Gmbh | Verfahren zur Ermittlung der Kraftverhältnisse an der Düsennadel eines direkt getriebenen Piezoinjektors |
| WO2012126736A1 (de) | 2011-03-23 | 2012-09-27 | Continental Automotive Gmbh | Verfahren zur ermittlung der kraftverhältnisse an der düsennadel eines direkt getriebenen piezoinjektors |
| US9121378B2 (en) | 2011-03-23 | 2015-09-01 | Continental Automotive Gmbh | Method for determining the force conditions at the nozzle needle of a directly driven piezo injector |
Also Published As
| Publication number | Publication date |
|---|---|
| US8365704B2 (en) | 2013-02-05 |
| DE102007033469B4 (de) | 2017-06-14 |
| CN101755116B (zh) | 2013-12-11 |
| KR101498875B1 (ko) | 2015-03-05 |
| US20100288238A1 (en) | 2010-11-18 |
| DE102007033469A1 (de) | 2009-01-22 |
| CN101755116A (zh) | 2010-06-23 |
| KR20100057616A (ko) | 2010-05-31 |
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