EP2054605A1 - Verfahren und vorrichtung zum betreiben einer fluidzumessvorrichtung - Google Patents
Verfahren und vorrichtung zum betreiben einer fluidzumessvorrichtungInfo
- Publication number
- EP2054605A1 EP2054605A1 EP08701515A EP08701515A EP2054605A1 EP 2054605 A1 EP2054605 A1 EP 2054605A1 EP 08701515 A EP08701515 A EP 08701515A EP 08701515 A EP08701515 A EP 08701515A EP 2054605 A1 EP2054605 A1 EP 2054605A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- duration
- pulses
- metering
- pulse
- 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.)
- Granted
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
- F02D41/24—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
- F02D41/2409—Addressing techniques specially adapted therefor
- F02D41/2419—Non-linear variation along at least one coordinate
-
- 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
- F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
-
- 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
- F02D2041/2031—Control of the current by means of delays or monostable multivibrators
Definitions
- the invention relates to a method and a device for operating a Fluidzumessvorraum.
- Fluid metering devices are used, for example, for metering fuel into a combustion chamber of an internal combustion engine.
- the combustion process can be suitably influenced and / or an exhaust aftertreatment system can be provided, by means of which pollutants generated during combustion are converted into harmless substances.
- the object on which the invention is based is to provide a method and a device for operating a fluid meter, which enables precise operation of the fluid meter.
- the invention is characterized by a method and a correspondingly designed device for operating a Fluidzumessvortechnisch with a Festkorperaktuator which e-lectric energy is supplied by means of charging pulses and the electrical energy is removed by means of discharge pulses, a nozzle needle, on which the Festkorperaktuator to adjust their position acting and in a closed position prevents a metering of fluid and allows the metering of fluid outside the closed position.
- a desired on-control duration is predetermined, which extends from generating a first charge pulse to generating a first discharge pulse for a fluid metering.
- a number of charging pulses to be set which are to be supplied to the solid-state actuator with a predetermined pulse period duration, for one, ie a single, fluid metering, is predetermined such that the time duration from the generation of the last charging pulse until the end of the desired activation duration of the increase a given increase value is greater than the pulse duration odendauer.
- a corrected actuation duration is determined as a function of the desired actuation duration in such a way that an instability in the change in the metered fluid caused by a change in the number of charge pulses to be set is compensated for.
- the Fluidzumessvorrich- device is controlled with the number of charge pulses to be set and the corrected drive time and indeed for carrying out the Fluidzuflop.
- the corrected drive time is at least in any case lower than the desired drive time, in particular when just another charge pulse has been added, compared to a slightly lower corrected drive time, in which the further charge pulse is not added.
- the increase value corresponds to the predetermined pulse period duration.
- the desired drive duration is greater than a product of the predetermined pulse period duration and a predetermined default number of charge pulses addition to the increase value, the corrected drive duration is set equal to the desired drive duration. This makes it possible to save computational effort in these cases without having to accept a loss in the precision of the metering of the fluid mass to be metered, especially with regard to very small quantities.
- the corrected drive time is determined by means of a characteristic field which is predetermined.
- characteristic maps can be determined empirically particularly simply and thus represent the real behavior of the fluid metering apparatus in a particularly simple manner and therefore simply support a precise metering of the fluid.
- FIG. 2 shows a signal curve of charge pulses and discharge pulses plotted over the time t
- FIG. 3 is a flowchart of a program which is described in FIG.
- Control device is stored and is executed during the operation of the Fluidzumessvoroplasty, and
- Figure 4 plotted several waveforms over time t.
- a fluid metering device (FIG. 1) comprises a housing 1, into which a fluid channel 2 is introduced, which is hydraulically coupled in the intended operation of the fluid metering device with a fluid supply, which can be, for example, a common rail.
- the housing 1 has a housing recess into which a valve body 3 is introduced.
- the valve body 3 comprises an insert body 3 with a valve body recess 7, into which a nozzle needle 9 is inserted.
- a nozzle 15 is formed, specifically in cooperation between the korper 5 and the nozzle needle 9.
- the nozzle needle 9 is formed as an outwardly opening nozzle needle.
- it can also be designed as an otherwise nozzle needle, which is known in the art for such applications in Fluidzumess- devices.
- it can also be designed to open inwards.
- a return spring 11 is further arranged, which is designed and arranged so that it is acted upon by the nozzle needle 9 without the action of other forces with a force that brings them into their closed position or stop in this.
- the nozzle needle In the closed position, the nozzle needle prevents the metering of fluid. Outside the closed position, the nozzle needle allows the metering of fluid.
- the fluid channel 2 is thus designed so that it communicates hydraulically with the nozzle 15.
- a Festkorperaktuator 13 is arranged in the housing recess of the housing 1, which is mechanically coupled to the nozzle needle 9.
- the Festkorperaktuator 13 is preferably fixed relative to the nozzle needle 9 remote from the axial end substantially fixed relative to the housing 1 is arranged. For this he may, for example, in principle be caulked with a first end cap with the housing.
- a thermal compensation element is provided, which acts on the Festkorperaktuator 13 such that there are different thermal expansion coefficients between the Material of the housing 1 and the Festkorperaktuators 13 compensated.
- the Festkorperaktuator 13 At its nozzle end facing the axial end 9 of the Festkorperaktuator 13 is preferably provided with a second end cap and then preferably via this mechanically coupled directly to the nozzle needle 9 mechanically.
- the Festkorperaktuator further summarizes preferably a bourdon tube, through which it is biased internally.
- the Festkorperaktuator can be designed for example as a piezo actuator, so in particular as a piezoelectric actuator. However, it can also be embodied as another solid-state actuator known to a person skilled in the art, such as, for example, a magnetostrictive actuator.
- the fluid meter is associated with a control device 17, which is electrically conductively coupled to the Festkorperaktuator 13.
- the control device may also be referred to as a device for operating the fluid metering device.
- the control device is also designed to control further actuators of an internal combustion engine, such as a throttle valve, an ignition coil, or a Abgasruckbowventils.
- an internal combustion engine such as a throttle valve, an ignition coil, or a Abgasruckbowventils.
- 17 different sensors are assigned to the control device, which detect measurement variables.
- sensors may be, for example, an accelerator pedal sensor, which detects an accelerator pedal position, and / or an air mass sensor, which detects an air mass flow in an intake tract, preferably upstream of a throttle flap, and / or a rotational speed sensor, which detects a rotational speed of a crankshaft and / or a fuel pressure sensor, detects a fuel pressure and / or an exhaust gas probe whose measurement signal is representative of an air / fuel ratio in the combustion chamber of the internal combustion engine.
- the control device 17 is adapted to fürzubuchen a viasstechnikszu limp through the nozzle 15 that the Festkorperaktuator first electrical energy is supplied by means of charging pulses and temporally offset the Festkorperaktuator electrical energy is removed by means of discharge pulses.
- the Festkorperaktuator By supplying the electrical energy, an increase in the axial extent of the Festkorperaktuators 13 and thus shifting the position of the nozzle needle 9 out of its closed position. With increasingly zugeschreibter electrical energy, the nozzle needle 9 thus moves away more and more away from its closed position, so their stroke increases.
- the axial Langung the Festkorperaktuators 13 is reduced again, causing a return of the nozzle needle 9 in its closed position.
- the pulse width of the individual charging pulses is substantially the same.
- the pulse height is preferably dependent on the electrical properties of the solid state actuator, such as its capacity, and / or environmental conditions, such as the temperature of the fluid metering device or, for example, the pressure of the fluid to be metered.
- a number N_EFF to be set is applied thereto at charging pulses which correspond to a predefined number N_MAX.
- the default number N MAX can be 20, for example, in the exemplary embodiment in FIG. 2 it is shown as an example by 5.
- the pulse period duration T_1PULS can be, for example, 10 ⁇ sec.
- the charge pulses and the discharge pulses are preferably current pulses, by means of which a current I is impressed.
- a charging time TL is given by a product of the pulse period T_1PULS and the number N_EFF to be set at charging pulses.
- a drive duration in the exemplary embodiment illustrated here a corrected drive duration TI COR, extends from the generation of a first charge pulse to the generation of a first discharge pulse for a respective fluid metering.
- a discharge duration T_EL preferably also includes a plurality of discharge pulses, which are also generated periodically.
- the program is started in a step S1, preferably close to an engine start of an internal combustion engine.
- a desired actuation time T I takes place. This is preferably done by means of a further program, which is also processed in the control device 17 and in particular taking into account the respective operating point, which can be significantly influenced for example by the accelerator pedal position or by a current temperature of Fluidzumessvortechnisch or the internal combustion engine.
- the desired drive time T I can also be specified externally with respect to the control device 17.
- the default number N MAX can be fixed, for example, and thus be 20, for example.
- a step S7 it is checked whether the desired actuation duration TI is greater than a product of the predefined number N MAX and the pulse period duration T IPULS in addition to a predefined increase value T E.
- the predefined increase value can For example, be particularly easy equal to the pulse period T_1PULS. However, in principle it can also be chosen larger than the pulse period T_1PULS. Furthermore, it can in principle also be a fraction of the pulse period duration, such as, for example, 1/10 of the pulse period duration.
- step S9 is preferably executed, in which the corrected actuation duration T I COR is assigned the desired actuation duration T I. Subsequently, the processing is then continued in a step Sil, in which the fluid metering device with the number N EFF to be set to charge pulses and the corrected drive time T I COR is driven.
- the number N_EFF to be set is also assigned the default number N_MAX of the charging pulses.
- the discharge pulses are then generated for the corresponding discharge duration T EL, and thus the fluid metering is terminated again by the return of the nozzle needle 9 to its closed position.
- the program preferably remains for a predetermined waiting period TW before the processing is continued again in the step S3.
- the predetermined waiting time T_W can also be set such that a run of the program according to FIG. 3 is in a fixed relationship to the crankshaft angle and, for example, executed once per cylinder segment or if several times per cylinder and cylinder segment are also executed several times.
- a cylinder segment corresponds to a crankshaft angle, which is the total crankshaft angle of a working cycle divided by the number of cylinders and amounts to 180 °, for example, in a four-stroke internal combustion engine and four cylinders.
- the condition of step S7 is not met, the processing is continued in a step S15.
- step S15 the number N_EFF of the charging pulses to be set is determined. This is done by means of the integer division DIV specified there, where the dividend is the difference between the desired activation duration T_I and the increase value T_E and the divisor is the pulse period duration T_1PULS. In this way, on the one hand, it is ensured that only an integer number of charge pulses is set and, on the other hand, that at least the increase value T_E lies between the expiration of the desired activation duration T_I and the charging duration T_L.
- the corrected activation duration T_I_COR is subsequently dependent on the desired activation duration T_I and preferably also on the number to be set
- N EFF at charge pulses determined. This can be done, for example, by means of a fixed mathematical functional assignment between the desired actuation duration T_I and the corrected actuation duration T_I_COR.
- a map KF which also includes a characteristic, is stored in the memory of the control device, by means of which the assignment between the desired drive time T I and the corrected drive time T I COR takes place, preferably also by means of map interpolation.
- a map KF can be determined particularly easily empirically, and preferably by appropriate tests on a test bench or by appropriate simulations.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007005360A DE102007005360B3 (de) | 2007-02-02 | 2007-02-02 | Verfahren und Vorrichtung zum Betreiben einer Fluidzumessvorrichtung |
| PCT/EP2008/050430 WO2008092743A1 (de) | 2007-02-02 | 2008-01-16 | Verfahren und vorrichtung zum betreiben einer fluidzumessvorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2054605A1 true EP2054605A1 (de) | 2009-05-06 |
| EP2054605B1 EP2054605B1 (de) | 2011-09-28 |
Family
ID=39278291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08701515A Ceased EP2054605B1 (de) | 2007-02-02 | 2008-01-16 | Verfahren und vorrichtung zum betreiben einer fluidzumessvorrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2054605B1 (de) |
| DE (1) | DE102007005360B3 (de) |
| WO (1) | WO2008092743A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19944733B4 (de) * | 1999-09-17 | 2007-01-04 | Siemens Ag | Vorrichtung zum Ansteuern wenigstens eines kapazitiven Stellgliedes |
| DE10223553B4 (de) * | 2002-05-27 | 2004-08-05 | Siemens Ag | Verfahren zur Ansteuerung eines Aktors und zugehörige Steuereinrichtung |
| DE10336606B4 (de) * | 2003-08-08 | 2007-01-25 | Siemens Ag | Stellverfahren und Stellvorrichtung für einen Aktor |
| DE102004002311A1 (de) * | 2004-01-16 | 2005-08-18 | Robert Bosch Gmbh | Verfahren zur Korrektur von Ladezeitfehlern wenigstens eines Injektors |
| DE102004029906B4 (de) * | 2004-06-21 | 2017-01-19 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Steuern eines Einspritzventils und Computerprogramm |
| DE102004062073B4 (de) * | 2004-12-23 | 2015-08-13 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Kompensation von Prelleffekten in einem piezogesteuerten Einspritzsystem einer Verbrennungskraftmaschine |
| DE102005026217B4 (de) * | 2005-06-07 | 2010-07-08 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Ansteuern einer kapazitiven Last |
| DE102005032087A1 (de) * | 2005-07-08 | 2007-01-18 | Siemens Ag | Verfahren und Vorrichtung zum Steuern eines Einspritzventils |
-
2007
- 2007-02-02 DE DE102007005360A patent/DE102007005360B3/de not_active Expired - Fee Related
-
2008
- 2008-01-16 EP EP08701515A patent/EP2054605B1/de not_active Ceased
- 2008-01-16 WO PCT/EP2008/050430 patent/WO2008092743A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008092743A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008092743A1 (de) | 2008-08-07 |
| DE102007005360B3 (de) | 2008-07-24 |
| EP2054605B1 (de) | 2011-09-28 |
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