DE102009044969A1 - Method for determining switch-off time of solenoid valve of rail-diesel engine, involves providing reference characteristic as simulation characteristic by solenoid valve simulation circuit that imitates reference measurement characteristic - Google Patents
Method for determining switch-off time of solenoid valve of rail-diesel engine, involves providing reference characteristic as simulation characteristic by solenoid valve simulation circuit that imitates reference measurement characteristic Download PDFInfo
- Publication number
- DE102009044969A1 DE102009044969A1 DE200910044969 DE102009044969A DE102009044969A1 DE 102009044969 A1 DE102009044969 A1 DE 102009044969A1 DE 200910044969 DE200910044969 DE 200910044969 DE 102009044969 A DE102009044969 A DE 102009044969A DE 102009044969 A1 DE102009044969 A1 DE 102009044969A1
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- Germany
- Prior art keywords
- solenoid valve
- simulation
- characteristic
- voltage
- voltage curve
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- 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.)
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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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- 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
- F02D41/20—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
- F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F2007/1894—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings minimizing impact energy on closure of magnetic circuit
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Bestimmung des Ausschaltzeitpunkts eines Magnetventils, insbesondere eines Magnetventils einer Einspritzeinrichtung einer Common Rail-Dieselbrennkraftmaschine, sowie eine zugehörige Vorrichtung.The present invention relates to a method for determining the switch-off of a solenoid valve, in particular a solenoid valve of an injection device of a common rail diesel engine, and an associated device.
In Einspritzeinrichtungen, wie sie beispielsweise aus der
In derartigen Einspritzeinrichtungen ist es erforderlich, den Öffnungs- und Schließzeitpunkt möglichst genau einzuhalten, um die Menge des zugeführten Kraftstoffs möglichst präzise zu definieren. Hierzu ist es erforderlich, die Ein- und Ausschaltdauer des zugehörigen Magnetventils zu ermitteln. Insbesondere beim Entregungsvorgang eines Magnetventils treten hierbei jedoch Schwierigkeiten auf.In such injectors, it is necessary to comply with the opening and closing timing as accurately as possible in order to define the amount of fuel supplied as precisely as possible. For this purpose, it is necessary to determine the on and off duration of the associated solenoid valve. However, difficulties arise in particular during the de-excitation process of a solenoid valve.
Verfahren zur Bestimmung der Ausschaltzeit von Magnetventilen sind beispielsweise aus der
Die bekannten Verfahren weisen eine Reihe von Nachteilen auf. Zunächst muss das ermittelte Messsignal auf den Eingangsbereich eines im Motorsteuergerät verwendeten Analog-Digital-Wandlers im Bereich von typischerweise 3,3 bis 5 Volt reduziert (”heruntergeteilt”) werden. Hierdurch ergibt sich ein schlechterer Signal-Rausch-Abstand. Ferner muss das zum Vergleich verwendete Signal abgeleitet werden, wodurch, verbunden mit den übrigen genannten Rechenschritten, eine übermäßig hohe CPU-Auslastung hervorgerufen wird. Die genannten Verfahren sind daher außerordentlich ressourcenintensiv.The known methods have a number of disadvantages. First, the detected measurement signal must be reduced ("split down") to the input range of an analog-to-digital converter used in the engine control unit in the range of typically 3.3 to 5 volts. This results in a poorer signal-to-noise ratio. Furthermore, the signal used for comparison must be derived, which, in conjunction with the other mentioned calculation steps, causes an excessively high CPU load. The methods mentioned are therefore extremely resource-intensive.
Ferner haben bekannte Verfahren den Nachteil, dass Störungen in der Spannungsversorgung, die zu zeitlichen Änderungen des durch die Magnet- bzw. Erregerwicklung fließenden Stroms führen, als Hinweis auf eine Bewegung des Magnetankers fehlgedeutet werden können.Furthermore, known methods have the disadvantage that disturbances in the voltage supply, which lead to temporal changes in the current flowing through the magnet or field winding current, can be misinterpreted as an indication of a movement of the magnet armature.
Es ist daher wünschenswert, verbesserte Verfahren zur Bestimmung der Ausschaltzeit von Magnetventilen, insbesondere von Magnetventilen, die in Einspritzeinrichtungen von Common Rail-Dieselbrennkraftmaschinen verwendet werden, anzugeben.It is therefore desirable to provide improved methods for determining the turn-off time of solenoid valves, particularly solenoid valves, used in injectors of common-rail diesel engines.
Offenbarung der ErfindungDisclosure of the invention
Erfindungsgemäß wird ein Verfahren zur Bestimmung des Ausschaltzeitpunkts eines Magnetventils, insbesondere eines Magnetventils einer Einspritzeinrichtung einer Common Rail-Dieselbrennkraftmaschine, mit den Merkmalen des Patentanspruchs 1 vorgeschlagen. Eine erfindungsgemäß ebenfalls vorgesehene Vorrichtung ist zur Durchführung eines erfindungsgemäßen Verfahrens eingerichtet und weist die entsprechenden Mittel, Elemente oder Einheiten auf. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche sowie der nachfolgenden Beschreibung.According to the invention a method for determining the switch-off of a solenoid valve, in particular a solenoid valve of an injector of a common rail diesel engine, with the features of claim 1 is proposed. A device likewise provided according to the invention is set up to carry out a method according to the invention and has the corresponding means, elements or units. Advantageous embodiments are the subject of the dependent claims and the following description.
Vorteile der ErfindungAdvantages of the invention
Die vorliegende Erfindung wird nachfolgend in Bezug auf Magnetventile beschrieben, bei denen, wie zuvor dargestellt, eine Erregung der Magnetspule eine Öffnung des Ventils und eine Entregung entsprechend einen Ventilschluss herbeiführt. Entsprechende Ventile kommen beispielsweise in der in der
Die vorliegende Erfindung beinhaltet die technische Lehre, einen Simulations-Spannungsverlauf durch Verwendung einer einfachen Hardwareschaltung in Form eines RC-Gliedes bereitzustellen. Die Verwendung eines derartigen RC-Glieds hat den besonderen Vorteil, dass hierdurch einfach und kostengünstig eine Simulationsschaltung eines entsprechenden Magnetventils bereitgestellt werden kann. Das genannte RC-Glied ist vorteilhafterweise im Steuergerät vorgesehen. Ein derartiges RC-Glied, wie es auch im Rahmen der Figurenbeschreibung dargestellt ist, besteht in der einfachsten Ausführung lediglich aus wenigsten einem Kondensator und wenigsten einem Widerstand. Geeignete Mittel zur Beaufschlagung des RC-Glieds mit Spannung und zum definierten Abbau einer entsprechenden Spannung sind zweckmäßigerweise Bestandteil einer Simulationsschaltung.The present invention includes the technical teaching to provide a simulation voltage waveform by using a simple hardware circuit in the form of an RC element. The use of such an RC element has the particular advantage that this is simple and cost, a simulation circuit of a corresponding solenoid valve can be provided. Said RC element is advantageously provided in the control unit. Such an RC element, as it is also shown in the description of the figures, consists in the simplest embodiment only of at least one capacitor and at least one resistor. Suitable means for acting on the RC element with voltage and for the defined reduction of a corresponding voltage are expediently part of a simulation circuit.
Vorteilhafterweise wird ein über das RC-Glied nachgebildeter Simulations-Spannungsverlauf an einen Spannungsverlauf angepasst, der zuvor aus einer typischen Bestromung eines Magnetventils ohne Magnetventilbewegung (Ventilankerbewegung) ermittelt wurde (im Folgenden als Referenzmessungs-Spannungsverlauf bezeichnet). Das RC-Glied kann dabei an das jeweilige Magnetventil über die Veränderung bzw. Auswahl des Kondensators, sowie, im einfachsten Fall, durch Anpassen eines oder zweier Widerstände angepasst werden.Advantageously, simulated over the RC element simulation voltage waveform is adapted to a voltage curve, which was previously determined from a typical energization of a solenoid valve without solenoid valve movement (valve armature movement) (hereinafter referred to as reference measurement voltage curve). The RC element can be adapted to the respective solenoid valve via the change or selection of the capacitor, and, in the simplest case, by adjusting one or two resistors.
Der durch das RC-Glied bereitgestellte Simulations-Spannungsverlauf kann in einfacher Weise mit einem ermittelten Magnetventil-Spannungsverlauf (d. h. einem Spannungsverlauf, der durch Messung der Spannung am Magnetventil während des Schaltvorgangs gemessen wurde) verglichen werden.The simulation voltage waveform provided by the RC element can be readily compared to a detected solenoid valve voltage waveform (i.e., a voltage waveform measured by measuring the voltage on the solenoid valve during the switching operation).
Durch die gezielte Anpassung des Simulations-Spannungsverlaufs an den zugehörigen Referenzmessungs-Spannungsverlauf des Magnetventils muss das Messsignal nicht wie im Stand der Technik auf den Eingangsbereich eines Analog-Digital-Wandlers reduziert werden. Vielmehr kann in sehr einfacher Weise mittels eines Operationsverstärkers eine einfache Subtraktion des Magnetventil-Spannungsverlauf und des Simulations-Spannungsverlaufs durchgeführt werden. Durch die Verlagerung einer derartigen Berechung in eine einfache Schaltung werden in vorteilhafter Weise CPU-Zyklen eingespart. Das vorgeschlagene Verfahren ist daher gegenüber dem Stand der Technik besonders ressourcenschonend.The targeted adaptation of the simulation voltage curve to the associated reference measurement voltage curve of the solenoid valve does not require the measurement signal to be reduced to the input range of an analog-to-digital converter as in the prior art. Rather, a simple subtraction of the magnetic valve voltage curve and the simulation voltage curve can be carried out in a very simple manner by means of an operational amplifier. By shifting such a calculation into a simple circuit, CPU cycles are advantageously saved. The proposed method is therefore particularly resource-saving compared to the prior art.
Durch die Bereitstellung einer einfachen Hardwarefunktion wird ferner eine Erhöhung der Robustheit einer entsprechenden Abschaltzeitbestimmung herbeigeführt.By providing a simple hardware function, an increase in the robustness of a corresponding turn-off time determination is also brought about.
Weitere Vorteile und Ausgestaltungen der Erfindungen ergeben sich aus der Beschreibung und beiliegenden Zeichnung.Further advantages and embodiments of the invention will become apparent from the description and accompanying drawings.
Es versteht sich, dass die vorstehend genannten und die nachfolgend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.
Die Erfindung ist anhand von Ausführungsbeispielen in der Zeichnung schematisch dargestellt und wird im Folgenden unter Bezugnahme auf die Zeichnung ausführlich beschrieben.The invention is illustrated schematically by means of exemplary embodiments in the drawing and will be described in detail below with reference to the drawing.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
In
Die Hardwareschaltung weist eine Subtraktionsschaltung
Über den ersten Eingang
Das RC-Glied
Das Freigabesignal wird in nicht näher ausgeführter Weise über Widerstände R13, R14, R15 und R16 sowie über Transistoren T15 und T11 aufbereitet und führt über Leitung
Beispielhafte Simulations- und Magnetventil-Spannungsverläufe sind in
Die Vorrichtung
In
Der Referenzmessungs-Spannungsverlauf
Aufgrund der zuvor erläuterten Funktion der Schaltung
In Graph
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 19650865 A1 [0002, 0009] DE 19650865 A1 [0002, 0009]
- DE 3843138 A1 [0004] DE 3843138 A1 [0004]
- DE 3609599 A1 [0009] DE 3609599 A1 [0009]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910044969 DE102009044969A1 (en) | 2009-09-24 | 2009-09-24 | Method for determining switch-off time of solenoid valve of rail-diesel engine, involves providing reference characteristic as simulation characteristic by solenoid valve simulation circuit that imitates reference measurement characteristic |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910044969 DE102009044969A1 (en) | 2009-09-24 | 2009-09-24 | Method for determining switch-off time of solenoid valve of rail-diesel engine, involves providing reference characteristic as simulation characteristic by solenoid valve simulation circuit that imitates reference measurement characteristic |
Publications (1)
Publication Number | Publication Date |
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DE102009044969A1 true DE102009044969A1 (en) | 2011-03-31 |
Family
ID=43662569
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DE200910044969 Withdrawn DE102009044969A1 (en) | 2009-09-24 | 2009-09-24 | Method for determining switch-off time of solenoid valve of rail-diesel engine, involves providing reference characteristic as simulation characteristic by solenoid valve simulation circuit that imitates reference measurement characteristic |
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DE (1) | DE102009044969A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011151128A1 (en) * | 2010-05-31 | 2011-12-08 | Continental Automotive Gmbh | Determining the closing point in time of an injection valve on the basis of an analysis of the actuating voltage using an adapted reference voltage signal |
CH709613A1 (en) * | 2014-05-08 | 2015-11-13 | Liebherr Machines Bulle Sa | Method and device for determining the armature stroke of a magnetic actuator. |
DE102016218915A1 (en) | 2016-09-29 | 2018-03-29 | Robert Bosch Gmbh | Determination of the time of use and the time of waste for solenoid valves |
EP3954888A1 (en) * | 2020-08-12 | 2022-02-16 | Sonplas GmbH | Method for identifying an event and inspection system for inspecting a component |
DE102010027806B4 (en) | 2010-04-15 | 2024-01-18 | Robert Bosch Gmbh | Method for operating an internal combustion engine, in which a variable is determined |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3609599A1 (en) | 1986-03-21 | 1987-09-24 | Bosch Gmbh Robert | METHOD FOR CONTROLLING THE DEACTIVATION TIME OF ELECTROMAGNETIC DEVICES, ESPECIALLY ELECTROMAGNETIC VALVES IN INTERNAL COMBUSTION ENGINES |
DE3843138A1 (en) | 1988-12-22 | 1990-06-28 | Bosch Gmbh Robert | METHOD OF CONTROLLING AND DETECTING THE MOVEMENT OF AN ARMATURE OF AN ELECTROMAGNETIC SWITCHING DEVICE |
DE19650865A1 (en) | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | magnetic valve |
-
2009
- 2009-09-24 DE DE200910044969 patent/DE102009044969A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3609599A1 (en) | 1986-03-21 | 1987-09-24 | Bosch Gmbh Robert | METHOD FOR CONTROLLING THE DEACTIVATION TIME OF ELECTROMAGNETIC DEVICES, ESPECIALLY ELECTROMAGNETIC VALVES IN INTERNAL COMBUSTION ENGINES |
DE3843138A1 (en) | 1988-12-22 | 1990-06-28 | Bosch Gmbh Robert | METHOD OF CONTROLLING AND DETECTING THE MOVEMENT OF AN ARMATURE OF AN ELECTROMAGNETIC SWITCHING DEVICE |
DE19650865A1 (en) | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | magnetic valve |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010027806B4 (en) | 2010-04-15 | 2024-01-18 | Robert Bosch Gmbh | Method for operating an internal combustion engine, in which a variable is determined |
WO2011151128A1 (en) * | 2010-05-31 | 2011-12-08 | Continental Automotive Gmbh | Determining the closing point in time of an injection valve on the basis of an analysis of the actuating voltage using an adapted reference voltage signal |
US9494100B2 (en) | 2010-05-31 | 2016-11-15 | Continental Automotive Gmbh | Determining the closing point in time of an injection valve on the basis of an analysis of the actuation voltage using an adapted reference voltage signal |
CH709613A1 (en) * | 2014-05-08 | 2015-11-13 | Liebherr Machines Bulle Sa | Method and device for determining the armature stroke of a magnetic actuator. |
DE102016218915A1 (en) | 2016-09-29 | 2018-03-29 | Robert Bosch Gmbh | Determination of the time of use and the time of waste for solenoid valves |
WO2018059816A1 (en) | 2016-09-29 | 2018-04-05 | Robert Bosch Gmbh | Determining the pickup time and the dropout time for solenoid valves |
EP3954888A1 (en) * | 2020-08-12 | 2022-02-16 | Sonplas GmbH | Method for identifying an event and inspection system for inspecting a component |
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