EP1561029B2 - Method and device for measuring the injection rate of an injection valve for liquids - Google Patents
Method and device for measuring the injection rate of an injection valve for liquids Download PDFInfo
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- EP1561029B2 EP1561029B2 EP03809686A EP03809686A EP1561029B2 EP 1561029 B2 EP1561029 B2 EP 1561029B2 EP 03809686 A EP03809686 A EP 03809686A EP 03809686 A EP03809686 A EP 03809686A EP 1561029 B2 EP1561029 B2 EP 1561029B2
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- Prior art keywords
- pressure
- injection
- measurement
- measurement volume
- volume
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- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/001—Measuring fuel delivery of a fuel injector
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- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Definitions
- the injected fuel causes pressure oscillations in the corresponding natural frequencies of the measuring volume, these natural frequencies depending on the geometric dimensions of the measuring volume.
- many harmonics are usually excited, with several vibration modes are usually possible. This makes it difficult to filter the pressure sensor measuring signal, since the frequencies of the natural oscillations are partly in the range of the frequencies of the measuring signal.
- the density depends on the temperature of the test medium. To take this into account, the temperature will be Measured in the measuring volume by means of a temperature sensor and the density corrected accordingly. The temperature measurement is selective and does not take into account a possibly unequal temperature in the entire measuring volume. Such a method is described in WO 02/064970 A described.
- the device according to the invention with the features of claim 1 has the advantage that can be determined from the pressure curve in a simple manner, the injection quantity.
- the time course of the pressure in the measuring volume is recorded during the injection and from this the time course of the injection quantity is calculated.
- the sound velocity is determined. From the increase in pressure and the speed of sound can then directly the injection quantity or its time course, so calculate the rate of injection rate.
- the speed of sound is determined by means of a separate measurement process, in which a sound pulse is emitted by a sound generator into the measurement volume and is collected by the pressure sensor. If the sound generator and the pressure sensor are arranged opposite each other, the sound velocity can be calculated directly from the distance and the running time. This is a very fast measuring method, which causes hardly any significant delays in the measurement process.
- the measurement data of the pressure curve are stored with the aid of an electronic computer, which also makes a direct further processing of the data possible.
- the frequency of a natural pressure oscillation of the measuring volume is determined from the pressure measured values. From the natural frequency, the sound velocity then results as an average value over the entire measurement volume, without the need for a separate measurement with corresponding devices.
- the filtering of the pressure measured values is carried out, for example, with a low-pass filter, so that disturbances and noise are largely eliminated. From the time differentiation of the pressure signal can then determine the injection rate.
- the device according to the invention with the features of claim 1 has the advantage over the prior art that the measurement signal can be better filtered.
- the pressure sensor is arranged in the pressure node of the first compressive natural vibration, that is, the natural vibration, so that the pressure sensor does not detect a signal of the natural vibration. Therefore, the cut-off frequency of the low-pass filter can be shifted upwards by a factor of two for smoothing the pressure measurement values.
- FIG. 1 the measuring device is shown in a partially sectioned view.
- a cylindrical measuring volume 1 with a wall 2 is completely filled with a test liquid, wherein the measuring volume 1 is completed on all sides.
- the wall 2 has a first base area 102 and a second base area 202, which are connected by the side wall 303, which has a longitudinal axis 4.
- an injection valve 3 projects with its tip into the measuring volume 1, wherein the passage of the injection valve 3 is closed by the wall 2 liquid-tight.
- the injection valve 3 has a valve body 7, in which in a bore 6, a piston-shaped valve needle 5 is arranged longitudinally displaceable.
- test liquid flows from a pressure space 9 formed between the valve needle 5 and the wall of the bore 6 to the injection openings 12 and is injected from there into the measuring volume 1 until the injection openings 12 pass through the valve needle 5 are closed again.
- the injection of the test liquid takes place here with a high pressure, which can be up to 200 MPa depending on the injection valve used.
- a pressure holding valve 17 line 16 In the side wall 303 of the cylindrical wall 2 opens a connected to a pressure holding valve 17 line 16, can be derived by the test liquid from the measuring volume 1 in a not shown in the drawing leakage volume.
- a control valve 15 is also arranged, through which the line 16 can be closed if necessary, if a derivation of test liquid from the measuring volume 1 is not desired.
- the pressure-maintaining valve 17 ensures that a certain pressure in the measuring volume 1 is maintained and this always remains completely filled with liquid.
- a holder 22 projects through the second base 202 of the wall 2 into the measuring volume 1.
- a pressure sensor 20 is arranged, which is connected via a signal line 24, which leads out of the measuring volume 1 in the holder 22 with an electronic computer 28, wherein the passage of the holder 22 is sealed by the wall 2 liquid-tight.
- the pressure sensor 20 is arranged in the median plane between the two base surfaces 102, 202 of the wall 2 and thus has the same distance to both base surfaces 102, 202. Since the pressure sensor 20 is also located on the longitudinal axis 4, it has to the side surface 303 on all sides the same distance s.
- the signal that the pressure sensor 20 supplies read and stored electronically.
- the pressure sensor 20 is constructed, for example, on a piezo-based basis, so that even rapid changes in pressure can be measured without appreciable delay.
- a sounder 21 is arranged, which has the distance s from the pressure sensor 20.
- a separate sound receiver 30 diametrically opposite the sounder 21 on the side surface 303 in order to obtain the largest possible distance of the sound signal and thus greater accuracy in determining the speed of sound c.
- the time course of the pressure is measured, from which in turn the injection rate r (t) can be determined, ie the amount dm (t) of the test fluid injected per unit time dt.
- the pressure in the measuring volume 1 increases. Liquids are virtually incompressible compared to gases, so that even a small increase in volume leads to a well-measurable pressure increase. Due to the impact-like introduction of the test liquid, pressure oscillations are excited in the measuring volume 1.
- the natural frequencies depend on the geometric dimensions of the measurement volume 1:
- FIG. 2 shows this first natural compressive vibration schematically, wherein the lines designated p show the pressure curve, in which at the edges bellies are to be found and in the middle, ie in the radial plane of the cylindrical measuring volume in which the pressure sensor 20 is disposed, a pressure node.
- the pressure sensor 20 does not register the first natural pressure vibration since no pressure changes occur at the pressure node. Nor are the 2nd, 4th and all other even harmonics recorded by the pressure sensor 20.
- the procedure is as follows: Into the measuring volume 1, in which the test liquid is located, the injection valve 3 injects a certain amount of liquid by a rapid longitudinal movement of the valve needle 5, through which the injection openings 12 are opened and closed again.
- the pressure sensor 20 measures the pressure p (t) which is read out and stored by the computer 28 at a specific rate of, for example, 100 kHz.
- equation (III) is used.
- the measured values p (t) stored in the computer are time-differentiated and multiplied by the factor V / c 2 , which directly yields the injection rate r (t).
- the cut-off frequency ⁇ G for the low-pass filter can be selected to be twice as large as the first fundamental vibration is not registered by the pressure sensor 20.
- the smoothed pressure readings are then differentiated in time, and after multiplication by the factor V / c 2 results in a known volume V, the injection rate r (t).
- the speed of sound c can also be determined in a separate method.
- FIG. 3 shows the time course of pressure p (t) and its derivative dp (t) / dt as a function of time t in arbitrary units U.
- an injector as used for direct-injection, auto-ignition internal combustion engines, this corresponds to a fuel injection, which is divided into a pilot or pilot injection and a subsequent main injection.
- the derivative dp (t) / dt gives a value which is proportional to the injection rate r (t).
- V / c 2 By multiplication by the factor V / c 2 , one finally obtains from this the absolute value of the injection rate r (t).
- the measurement method together with the described measurement setup thus makes it possible to measure the pressure profile and to determine the speed of sound c under the current test conditions, from which the injection quantity and the injection rate can be determined. If the speed of sound c is calculated from the frequency of the natural vibrations, then all the necessary variables from the pressure curve can be determined, which excludes errors due to additional components. Due to the arrangement of the pressure sensor 20 exactly between the two base areas 102, 202, the cut-off frequency ⁇ G of the low-pass filter can be raised to twice the frequency of the fundamental vibration ⁇ e , without a qualitative impairment is to be expected by the filtering. Elaborate calibration procedures, in which the speed of sound is determined in a separate measurement method, can thus be dispensed with.
- the test fluid may be fuel or another fluid whose properties are similar to that used in normal use of the fuel injector.
- the measurement volume 1 need not be cylindrical, but instead of a cylinder, a cuboid measuring volume 1 or another suitable shape may be provided, for example a ball.
- the pressure sensor 20 is also arranged here in a pressure node of the first natural pressure vibration of the measuring volume 1 in order to set the cutoff frequency for the filtering as high as possible.
Abstract
Description
Bei der Fertigungs- und Funktionsprüfung von Kraftstoff-Einspritzkomponenten, wie beispielsweise von Einspritzventilen, Common-Rail-Injektoren und anderen Hochdruckeinspritzventilen, sind zur Mengenmessung verschiedene Prüfvorrich-tungen und -verfahren im Stand der Technik beschrieben. So ist beispielsweise aus der
Ein alternatives und genaues Verfahren, wie es beispielsweise in
In der Praxis wird dies jedoch durch eine Reihe von Faktoren erschwert: Im Messvolumen V kommt es durch den eingespritzten Kraftstoff zu Druckschwingungen in den entsprechenden Eigenfrequenzen des Messvolumens, wobei diese Eigenfrequenzen von den geometrischen Abmessungen des Messvolumens abhängen. Neben der Grundschwingung werden in der Regel auch viele Oberschwingungen angeregt, wobei in der Regel mehrere Schwingungsmoden möglich sind. Dies erschwert eine Filterung des Drucksensor-Messsignals, da die Frequenzen der Eigenschwingungen zum Teil im Bereich der Frequenzen des Messsignals liegen.In practice, however, this is made difficult by a number of factors: In the measuring volume V, the injected fuel causes pressure oscillations in the corresponding natural frequencies of the measuring volume, these natural frequencies depending on the geometric dimensions of the measuring volume. In addition to the fundamental vibration also many harmonics are usually excited, with several vibration modes are usually possible. This makes it difficult to filter the pressure sensor measuring signal, since the frequencies of the natural oscillations are partly in the range of the frequencies of the measuring signal.
Weiter wird eine genaue Messung des Absolutwerts der Einspritzmenge Δm dadurch erschwert, dass die Messgröße des Drucks erst auf die eingespritzte Flüssigkeitsmenge umgerechnet werden muss. Die Umrechnungsfaktoren beinhalten hierbei den Kompressionsmodul und die Dichte. Diese Größen hängen von den jeweiligen Prüfbedingungen und der Vorgeschichte ab und stehen deshalb nicht mit der notwendigen Genauigkeit aus früheren Messungen zur Verfügung. Um diese Größen zu ermitteln ist für jede Messung ein separater, aufwendiger Kalibriervorgang nötig, was die Messung umständlich und in der Praxis schwer durchführbar macht. Hierzu wird über einen separaten Kalibrierzylinder ein definiertes Kalibrier-Volumen ΔVk in das Messvolumen V eingebracht und die Druckänderung Δpk gemessen. Der Kompressionsmodul K ergibt sich dann aus der Beziehung
Damit lässt sich jetzt das eingespritzte Volumen ΔV berechnen:
Um letztendlich die Einspritzmenge zu berechnen ist eine Umrechnung auf die Masse erforderlich, was die Kenntnis der Dichte ρ notwendig macht:
Hierbei hängt die Dichte von der Temperatur des Prüfmediums ab. Um dies zu berücksichtigen wird die Temperatur mittels eines Temperatursensors im Messvolumen gemessen und die Dichte entsprechend korrigiert. Die Temperaturmessung ist dabei punktuell und berücksichtigt nicht eine eventuell ungleiche Temperatur im gesamten Messvolumen. Ein derartiges Verfahren wird in der
Für die Ermittlung des Kompressionsmoduls K nach der angegebenen Gleichung (I) ist die Einbringung eines definierten Kalibrier-Volumens in das Messvolumen notwendig, was einen separaten Volumengeber nötig macht. Darüber hinaus ergibt sich der Nachteil, dass für die Kalibriermessung eine separate Messzeit notwendig ist, was die mögliche Frequenz von aufeinanderfolgenden Messungen reduziert.For the determination of the compression modulus K according to the given equation (I), the introduction of a defined calibration volume into the measurement volume is necessary, which makes a separate volume sensor necessary. In addition, there is the disadvantage that a separate measuring time is necessary for the calibration measurement, which reduces the possible frequency of successive measurements.
Die erfindungsgemäße Vorrichtung mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass sich aus dem Druckverlauf in einfacher Weise die Einspritzmenge bestimmen lässt. Hierzu wird der zeitliche Verlauf des Drucks im Messvolumen bei der Einspritzung aufgezeichnet und daraus der zeitliche Verlauf der Einspritzmenge berechnet. Um den Faktor zur Berechnung des Absolutwerts der Einspritzmenge zu ermitteln, wird die Schallgeschwindigkeit bestimmt. Aus dem Druckanstieg und der Schallgeschwindigkeit lässt sich dann direkt die Einspritzmenge bzw. deren zeitlicher Verlauf, also die Mengen-Einspritzrate, berechnen.The device according to the invention with the features of
In einer Weiterbildung wird die Schallgeschwindigkeit mittels eines separaten Messvorgangs ermittelt, bei dem ein Schallimpuls von einem Schallgeber in das Messvolumen abgegeben wird und durch den Drucksensor aufgefangen wird. Sind der Schallgeber und der Drucksensor einander gegenüber angeordnet, so lässt sich aus dem Abstand und der Laufzeit direkt die Schallgeschwindigkeit berechnen. Dies ist ein sehr schnelles Messverfahren, das kaum nennenswerte Verzögerungen des Messablaufs bewirkt.In a further development, the speed of sound is determined by means of a separate measurement process, in which a sound pulse is emitted by a sound generator into the measurement volume and is collected by the pressure sensor. If the sound generator and the pressure sensor are arranged opposite each other, the sound velocity can be calculated directly from the distance and the running time. This is a very fast measuring method, which causes hardly any significant delays in the measurement process.
In einer Weiterbildung werden die Messdaten des Druckverlaufs mit Hilfe eines elektronischen Rechners gespeichert, der auch eine direkte Weiterbearbeitung der Daten möglich macht.In a further development, the measurement data of the pressure curve are stored with the aid of an electronic computer, which also makes a direct further processing of the data possible.
In einer Weiterbildung wird aus den Druckmesswerten die Frequenz einer Druckeigenschwingung des Messvolumens bestimmt. Aus der Eigenfrequenz ergibt sich dann die Schallgeschwindigkeit als gemittelte Größe über das gesamten Messvolumen, ohne dass eine separate Messung mit entsprechenden Vorrichtungen nötig wäre. Beispielshaft ist es hierbei möglich, die Frequenzanalyse mit Hilfe eines Fourier-Verfahrens zu berechnen, wobei auch andere, moderne Verfahren möglich sind.In a further development, the frequency of a natural pressure oscillation of the measuring volume is determined from the pressure measured values. From the natural frequency, the sound velocity then results as an average value over the entire measurement volume, without the need for a separate measurement with corresponding devices. By way of example, it is possible in this case to calculate the frequency analysis with the aid of a Fourier method, although other modern methods are also possible.
Die Filterung der Druckmesswerte wird beispielsweise mit einem Tiefpass durchgeführt, so dass Störungen und Rauschen weitgehend eliminiert werden. Aus der zeitlichen Differentiation des Drucksignals lässt sich dann die Einspritzmengenrate bestimmen.The filtering of the pressure measured values is carried out, for example, with a low-pass filter, so that disturbances and noise are largely eliminated. From the time differentiation of the pressure signal can then determine the injection rate.
Die erfindungsgemäße Vorrichtung mit den Merkmalen des Patentanspruchs 1 weist gegenüber dem Stand der Technik den Vorteil auf, dass das Messsignal besser gefiltert werden kann. Hierzu ist der Drucksensor im Druckknoten der ersten Druckeigenschwingung, also der Grundeigenschwingung, angeordnet, so dass der Drucksensor kein Signal der Grundeigenschwingung erfasst. Deshalb kann die Grenzfrequenz des Tiefpassfilters zur Glättung der Druckmesswerte um einen Faktor zwei nach oben verschoben werden.The device according to the invention with the features of
In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung dargestellt. Es zeigt
Figur 1- die Messvorrichtung mit den schematisch dargestellten Komponenten,
Figur 2- eine Darstellung des Messvolumens mit dem Druckverlauf der ersten Druckeigenschwingung und
Figur 3- das Diagramm einer Messung, wobei der Druck und dessen Ableitung über der Zeit abgetragen sind.
- FIG. 1
- the measuring device with the schematically illustrated components,
- FIG. 2
- a representation of the measuring volume with the pressure curve of the first natural pressure oscillation and
- FIG. 3
- the diagram of a measurement, where the pressure and its derivative are plotted over time.
In der
In die Seitenwand 303 der zylinderförmigen Wandung 2 mündet eine mit einem Druckhalteventil 17 verbundene Leitung 16, durch die Prüfflüssigkeit aus dem Messvolumen 1 in ein in der Zeichnung nicht dargestelltes Leckvolumen abgeleitet werden kann. In der Leitung 16 ist darüber hinaus ein Steuerventil 15 angeordnet, durch das im Bedarfsfall die Leitung 16 verschlossen werden kann, falls eine Ableitung von Prüfflüssigkeit aus dem Messvolumen 1 nicht gewünscht wird. Durch das Druckhalteventil 17 ist sichergestellt, dass ein gewisser Druck im Messvolumen 1 aufrecht erhalten wird und dieses stets völlig mit Flüssigkeit gefüllt bleibt.In the
Eine Halterung 22 ragt durch die zweite Grundfläche 202 der Wandung 2 in das Messvolumen 1 hinein. Am Ende der Halterung 22 ist ein Drucksensor 20 angeordnet, der über eine Signalleitung 24, die in der Halterung 22 aus dem Messvolumen 1 hinausführt, mit einem elektronischen Rechner 28 verbunden ist, wobei der Durchtritt der Halterung 22 durch die Wandung 2 flüssigkeitsdicht verschlossen ist. Der Drucksensor 20 ist in der Mittelebene zwischen den beiden Grundflächen 102, 202 der Wandung 2 angeordnet und hat somit zu beiden Grundflächen 102, 202 denselben Abstand. Da der Drucksensor 20 auch auf der Längsachse 4 liegt, weist er zur Seitenfläche 303 einen allseitig gleichen Abstand s auf. Über den elektronischen Rechner 28 kann das Signal, das der Drucksensor 20 liefert, ausgelesen und elektronisch gespeichert werden. Um eine schnelle Messung des Druckverlaufs zu ermöglichen ist der Drucksensor 20 beispielsweise auf Piezo-Basis gebaut, so dass auch schnelle Änderungen des Drucks ohne nennenswerte Verzögerung gemessen werden können. An der Seitenfläche 303 der Wandung 2 ist ein Schallgeber 21 angeordnet, der vom Drucksensor 20 den Abstand s aufweist. Alternativ kann es auch vorgesehen sein, dass ein separater Schallempfänger 30 diametral dem Schallgeber 21 an der Seitenfläche 303 gegenüberliegt, um eine möglichst große Laufstrecke des Schallsignals zu erhalten und damit eine größere Genauigkeit bei der Bestimmung der Schallgeschwindigkeit c.A
Die zu messende Einspritzmenge Δm der Prüfflüssigkeit kann aus dem Druckanstieg und der Schallgeschwindigkeit berechnet werden. Ist ρ die Dichte der Prüfflüssigkeit und V das Volumen des Messvolumens, so ergibt sich durch das Einspritzen des Einspritzventils bei konstantem Volumen V eine Änderung der Dichte Δρ, so dass gilt
Nach der bekannten akustischen Theorie ist der Zusammenhang zwischen der Schallgeschwindigkeit c, der Dichteänderung Δρ und dem Druckanstieg Δp wie folgt
Es gibt also einen direkten Zusammenhang zwischen dem Druckanstieg Δp und der Mengenänderung Δm.So there is a direct relationship between the pressure increase Δp and the amount change Δm.
Mit dem Drucksensor 20 wird der zeitliche Verlauf des Drucks gemessen, woraus sich wiederum die Einspritzrate r(t) bestimmen lässt, also die pro Zeiteinheit dt eingespritzte Menge dm(t) der Prüfflüssigkeit. Aus dem obigen Zusammenhang ergibt sich damit für die Einspritzrate r(t), also die zeitliche Ableitung der eingespritzten Menge dm(t)/dt, folgende Gleichung:
Das heißt, dass bei Kenntnis der Schallgeschwindigkeit c und des Volumens V aus dem zeitlichen Verlauf des Drucks p(t) der Absolutwert der Einspritzrate r(t) berechnet werden kann.This means that with knowledge of the speed of sound c and the volume V from the time course of the pressure p (t), the absolute value of the injection rate r (t) can be calculated.
Beim Einspritzen der Prüfflüssigkeit in das Messvolumen 1, das anfänglich einen konstanten Druck aufweist, der beispielsweise 1 MPa entspricht, steigt der Druck im Messvolumen 1 an. Flüssigkeiten sind im Vergleich zu Gasen praktisch inkompressibel, so dass auch eine kleine Mengenzunahme zu einer gut messbaren Druckerhöhung führt. Durch das stoßartige Einbringen der Prüfflüssigkeit werden im Messvolumen 1 Druckeigenschwingungen angeregt. Die Eigenfrequenzen hängen von den geometrischen Abmessungen des Messvolumens 1 ab: Für die erste Druckeigenschwingung, die sogenannte Grundschwingung, bei der eine Longitudinalwelle entlang der Längsachse 4 schwingt, ist die halbe Wellenlänge λ/2 gleich der Länge L des Messvolumens 1, also gilt
Für die Frequenz νn der n. Oberschwingung gilt entsprechend, dass die Länge des Messvolumens L ein Vielfaches von λ/2 sein muss:
Der Drucksensor 20 registriert die erste Druckeigenschwingung nicht, da am Druckknoten keine Druckänderungen auftreten. Ebensowenig werden die 2., 4. und alle anderen geradzahligen Oberschwingungen vom Drucksensor 20 aufgenommen.The
Zur Auswertung der Messung geht man folgendermaßen vor: In das Messvolumen 1, in dem sich die Prüfflüssigkeit befindet, spritzt das Einspritzventil 3 durch eine schnelle Längsbewegung der Ventilnadel 5, durch welche die Einspritzöffnungen 12 geöffnet und wieder verschlossen werden, eine bestimmte Flüssigkeitsmenge ein. Der Drucksensor 20 misst den Druck p(t), der mit einer bestimmen Rate von beispielsweise 100 kHz vom Rechner 28 ausgelesen und gespeichert wird.To evaluate the measurement, the procedure is as follows: Into the measuring
Um den zeitlichen Verlauf der Einspritzmenge dm(t)/dt, also die Einspritzrate r(t) zu bestimmen, benutzt man Gleichung (III). Die im Rechner gespeicherten Messwerte p(t) werden zeitlich differenziert und mit dem Faktor V/c2 multipliziert, was direkt die Einspritzrate r(t) ergibt.In order to determine the time course of the injection quantity dm (t) / dt, ie the injection rate r (t), equation (III) is used. The measured values p (t) stored in the computer are time-differentiated and multiplied by the factor V / c 2 , which directly yields the injection rate r (t).
Neben der Bestimmung der Schallgeschwindigkeit durch eine separate Messung ist es auch möglich, diese aus den gemessenen Druckmesswerten direkt zu bestimmen. Die im Rechner 28 aufgezeichneten Druckmesswerte sind zum einen verrauscht und zum anderen sind Druckeigenschwingungen des Messvolumens 1 überlagert, was zu weiteren Verfälschungen führt. Aus einer Frequenzanalyse kann aus den Druckmesswerten die Frequenzen der ersten Oberschwingung der Druckeigenschwingungen bestimmt werden, woraus nach der oben angegebenen Beziehung c = ν·L die Schallgeschwindigkeit c berechnet wird, die in der verwendeten Prüfflüssigkeit bei den vorliegenden Bedingungen herrscht. Obwohl die ungefähre Größe von c natürlich bekannt ist, kommt es doch zu Schwankungen durch veränderte Zusammensetzungen der Prüfflüssigkeit oder geänderte Temperaturen, was andernfalls zu einer Verminderung der Messgenauigkeit führen würde. Durch eine Filterung der Druckmesswerte durch einen Tiefpass kann hochfrequentes Rauschen unterdrückt werden. Wegen der Anordnung des Drucksensors 20 in der Mitte des Messvolumens kann die Grenzfrequenz νG für den Tiefpass doppelt so groß gewählt werden, da die erste Grundschwingung vom Drucksensor 20 nicht registriert wird. Die geglätteten Druckmesswerte werden anschließend zeitlich differenziert, und nach Multiplikation mit dem Faktor V/c2 ergibt sich bei bekanntem Volumen V die Einspritzrate r(t).In addition to the determination of the speed of sound by a separate measurement, it is also possible to directly determine these from the measured pressure measurements. The pressure readings recorded in the
Die Schallgeschwindigkeit c kann auch in einem separaten Verfahren bestimmt werden. Hierzu wird vom Schallgeber 21 ein Schallimpuls ausgesandt, der von dem als Schallempfänger dienenden Drucksensor 20 oder von einem separaten Schallempfänger 30 nach einer Laufzeit tL aufgefangen wird. Aus dem Abstand s von Schallgeber 21 und Drucksensor 20 berechnet sich dann nach
Das Messverfahren zusammen mit dem beschriebenen Messaufbau ermöglicht es also, den Druckverlauf zu messen und die Schallgeschwindigkeit c bei den aktuellen Prüfbedingungen zu bestimmen, woraus sich die Einspritzmenge und die Einspritzrate bestimmen lässt. Wird die Schallgeschwindigkeit c aus der Frequenz der Eigenschwingungen berechnet, so können sämtliche notwendigen Größen aus dem Druckverlauf bestimmt werden, was Fehler durch zusätzliche Bauteile ausschließt. Durch die Anordnung des Drucksensors 20 genau zwischen den beiden Grundflächen 102, 202 kann die Grenzfrequenz νG des Tiefpassfilters auf die doppelte Frequenz der Grundschwingung νe angehoben werden, ohne dass eine qualitative Beeinträchtigung durch das Filtern zu erwarten ist. Aufwendige Kalibrierverfahren, bei denen in einem separaten Messverfahren die Schallgeschwindigkeit bestimmt wird, können somit entfallen.The measurement method together with the described measurement setup thus makes it possible to measure the pressure profile and to determine the speed of sound c under the current test conditions, from which the injection quantity and the injection rate can be determined. If the speed of sound c is calculated from the frequency of the natural vibrations, then all the necessary variables from the pressure curve can be determined, which excludes errors due to additional components. Due to the arrangement of the
Die Prüfflüssigkeit kann Kraftstoff sein oder eine andere Flüssigkeit, deren Eigenschaften dem Stoff nahekommen, der im normalen Gebrauch des Einspritzventils verwendet wird. Das Messvolumens 1 muss nicht zylinderförmig ausgebildet sein, sondern statt eines Zylinders kann auch ein quaderförmiges Messvolumen 1 oder eine andere geeignete Form vorgesehen sein, beispielsweise eine Kugel. Der Drucksensor 20 wird auch hier in einem Druckknoten der ersten Druckeigenschwingung des Messvolumens 1 angeordnet, um die Grenzfrequenz für die Filterung möglichst hoch ansetzen zu können.The test fluid may be fuel or another fluid whose properties are similar to that used in normal use of the fuel injector. The
Claims (6)
- Device for measuring the injection rate (r(t)) of an injection valve (3) for liquids, with a measurement volume (1) which is closed off on all sides and is filled with a test liquid, with an orifice (10) in the wall (2) of the measurement volume (1) for receiving an injection valve (3), so that, in the installation position, the injection valve (3) projects with at least one injection orifice (12) into the measurement volume (1), and with a pressure sensor (20) which is arranged in the measurement volume (1), characterized in that
the pressure sensor (20) is arranged at the pressure node of the first natural pressure oscillation of the measurement volume (1), and the sound velocity can be determined by the measurement of the transit time of a sound signal in the measurement volume (1) or directly from the pressure measurement values. - Device according to Claim 1, characterized in that the measurement volume (1) is of cylindrical design.
- Device according to Claim 2, characterized in that the pressure sensor (20) is arranged in the radial plane which lies centrally between the two bases (102; 202) of the cylinder.
- Device according to Claim 1, characterized in that an electronic computer (28) detects and stores the measurement values of the pressure sensor (20).
- Device according to Claim 4, characterized in that the electronic computer (28) runs a program which calculates the characteristic frequencies of the measurement volume (1) from the recorded pressure measurement values (p(t)).
- Device according to Claim 1, characterized in that a sound transmitter (21) and a separate sound receiver (30) are arranged in the measurement volume (1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10249754 | 2002-10-25 | ||
DE10249754A DE10249754A1 (en) | 2002-10-25 | 2002-10-25 | Method and device for measuring the injection rate of a liquid injection valve |
PCT/DE2003/001852 WO2004040129A1 (en) | 2002-10-25 | 2003-06-04 | Method and device for measuring the injection rate of an injection valve for liquids |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1561029A1 EP1561029A1 (en) | 2005-08-10 |
EP1561029B1 EP1561029B1 (en) | 2006-08-23 |
EP1561029B2 true EP1561029B2 (en) | 2011-07-06 |
Family
ID=32087191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03809686A Expired - Lifetime EP1561029B2 (en) | 2002-10-25 | 2003-06-04 | Method and device for measuring the injection rate of an injection valve for liquids |
Country Status (6)
Country | Link |
---|---|
US (1) | US7171847B2 (en) |
EP (1) | EP1561029B2 (en) |
JP (1) | JP4130823B2 (en) |
AT (1) | ATE337484T1 (en) |
DE (2) | DE10249754A1 (en) |
WO (1) | WO2004040129A1 (en) |
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DE102004049002A1 (en) * | 2004-10-06 | 2006-04-13 | Robert Bosch Gmbh | Method for measuring the tightness of an injection valve for liquids |
DE602006017014D1 (en) * | 2005-07-20 | 2010-11-04 | Aea Srl | Measuring device for measuring the amount of fluid injected by an injector |
DE102005040768B4 (en) * | 2005-08-24 | 2007-05-10 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Method and device for injection rate and / or injection mass determination |
DE102005056153A1 (en) * | 2005-11-23 | 2007-05-24 | Robert Bosch Gmbh | Method for measuring injection quantity and injection rate of injection valve for liquids, involves measurement of pressure in measuring volume by means of pressure sensor during injection and recording these measuring value |
JP5103600B2 (en) * | 2007-07-09 | 2012-12-19 | 国立大学法人群馬大学 | Measuring method of instantaneous flow rate of gaseous fuel injector |
DE102007032745A1 (en) | 2007-07-13 | 2009-01-15 | Robert Bosch Gmbh | Device for determining the total pressure in a gas measuring stream of a combustion engine comprises a pressure measuring unit or a removal site arranged within a back-up channel through which flows a medium at high speed |
GB0713678D0 (en) * | 2007-07-13 | 2007-08-22 | Delphi Tech Inc | Apparatus and methods for testing a fuel injector nozzle |
DE102008040628A1 (en) | 2008-07-23 | 2010-01-28 | Robert Bosch Gmbh | Fluid i.e. fuel, quantity measuring method for engine of vehicle, involves determining injected fluid quantity from sound velocity of fluid found in chamber and from pressure drop that is measured in chamber during injection of fluid |
US7950267B2 (en) * | 2008-07-30 | 2011-05-31 | Bi-Phase Technologies, Llc | Liquid propane gas injector testing system and methods |
IT1392001B1 (en) * | 2008-11-27 | 2012-02-09 | Aea Srl | METHOD FOR MEASURING THE INSTANTANEOUS FLOW OF AN INJECTOR FOR GASEOUS FUELS |
EP2295788A1 (en) * | 2009-08-06 | 2011-03-16 | Continental Automotive GmbH | Method and arrangement for determining a mass flow of an injection process of an injection valve |
JP5418259B2 (en) * | 2010-02-02 | 2014-02-19 | 株式会社デンソー | Injection quantity measuring device |
DE102010002898A1 (en) * | 2010-03-16 | 2011-09-22 | Robert Bosch Gmbh | Method and device for evaluating an injection device |
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DE102011007611B4 (en) | 2011-04-18 | 2022-01-27 | Robert Bosch Gmbh | Device and method for determining at least one spray quantity and/or one spray rate of a liquid sprayed with a valve |
FR2995640B1 (en) * | 2012-09-19 | 2015-03-20 | Efs Sa | DEVICE FOR MEASURING A QUANTITY OF FLUID INJECTED BY AN INJECTOR |
JP5918683B2 (en) * | 2012-10-16 | 2016-05-18 | 株式会社小野測器 | Injection measuring device |
JP5956912B2 (en) * | 2012-11-08 | 2016-07-27 | 株式会社小野測器 | Injection measuring device and bulk modulus measuring device |
JP5956915B2 (en) * | 2012-11-15 | 2016-07-27 | 株式会社小野測器 | Injection measuring device and bulk modulus measuring device |
JP6163012B2 (en) * | 2013-05-15 | 2017-07-12 | 株式会社小野測器 | Injection measuring device |
JP6163013B2 (en) * | 2013-05-15 | 2017-07-12 | 株式会社小野測器 | Injection measuring device |
CN104295425B (en) * | 2014-06-05 | 2017-04-12 | 河南科技大学 | Oil injection law measuring system and method |
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DE102014212392A1 (en) * | 2014-06-27 | 2015-12-31 | Robert Bosch Gmbh | Method and device for characterizing an injector |
JP6335070B2 (en) * | 2014-08-26 | 2018-05-30 | 株式会社小野測器 | Injection measurement device and injection measurement method |
JP6306983B2 (en) * | 2014-08-26 | 2018-04-04 | 株式会社小野測器 | Injection measurement device and injection measurement method |
JP6344851B2 (en) * | 2014-08-26 | 2018-06-20 | 株式会社小野測器 | Injection measuring device |
DE102014225858A1 (en) * | 2014-12-15 | 2016-06-16 | Robert Bosch Gmbh | Method for calibrating a micromechanical sensor element and a system for calibrating a micromechanical sensor element |
DE102015209398A1 (en) | 2015-05-22 | 2016-11-24 | Robert Bosch Gmbh | Apparatus for measuring the injection rate, method for producing such a device and measuring method |
JP6497283B2 (en) | 2015-09-11 | 2019-04-10 | 株式会社デンソー | Data analysis device |
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CN109083790B (en) * | 2018-09-28 | 2023-07-18 | 西安交通大学 | System and method for measuring oil injection rate based on Zeuch piezomagnetic method |
CN109386420B (en) * | 2018-10-15 | 2021-02-02 | 哈尔滨工程大学 | Method for measuring multi-time fuel injection rule |
KR20200144246A (en) * | 2019-06-18 | 2020-12-29 | 현대자동차주식회사 | Method and system for compensating fuel injection amount |
CN111946519A (en) * | 2020-08-07 | 2020-11-17 | 哈尔滨工程大学 | Oil injection rule testing device based on ringing method sound velocity correction |
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DE3118425A1 (en) * | 1981-05-09 | 1982-12-09 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR DETECTING THE AMOUNT OF FUEL SUPPLIED TO THE COMBUSTION SPACES OF A DIESEL ENGINE |
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DE3916418A1 (en) * | 1989-05-19 | 1990-11-22 | Daimler Benz Ag | DEVICE FOR DETERMINING THE PERIOD OF THE FUEL LEAVING FROM A FUEL INJECTION NOZZLE OF AN AIR-COMPRESSING INJECTION COMBUSTION ENGINE |
US5753806A (en) * | 1996-10-30 | 1998-05-19 | Southwest Research Institute | Apparatus and method for determining the distribution and flow rate characteristics of an injection nozzle |
GB9930120D0 (en) * | 1999-12-21 | 2000-02-09 | Assembly Technology & Test Lim | Monitoring equipment for monitoring the performance of an engine fuel injector valve |
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DE10107032A1 (en) * | 2001-02-15 | 2002-08-29 | Bosch Gmbh Robert | Method, computer program and device for measuring the injection quantity of injection nozzles, in particular for motor vehicles |
US7080550B1 (en) * | 2003-08-13 | 2006-07-25 | Cummins Inc. | Rate tube measurement system |
US7197918B2 (en) * | 2003-08-14 | 2007-04-03 | International Engine Intellectual Property Company, Llc | Apparatus and method for evaluating fuel injectors |
-
2002
- 2002-10-25 DE DE10249754A patent/DE10249754A1/en not_active Withdrawn
-
2003
- 2003-06-04 AT AT03809686T patent/ATE337484T1/en active
- 2003-06-04 EP EP03809686A patent/EP1561029B2/en not_active Expired - Lifetime
- 2003-06-04 WO PCT/DE2003/001852 patent/WO2004040129A1/en active IP Right Grant
- 2003-06-04 DE DE50304788T patent/DE50304788D1/en not_active Expired - Lifetime
- 2003-06-04 JP JP2004547363A patent/JP4130823B2/en not_active Expired - Fee Related
- 2003-06-04 US US10/532,504 patent/US7171847B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1561029B1 (en) | 2006-08-23 |
ATE337484T1 (en) | 2006-09-15 |
EP1561029A1 (en) | 2005-08-10 |
US7171847B2 (en) | 2007-02-06 |
JP4130823B2 (en) | 2008-08-06 |
DE50304788D1 (en) | 2006-10-05 |
JP2006504038A (en) | 2006-02-02 |
WO2004040129A1 (en) | 2004-05-13 |
US20060156801A1 (en) | 2006-07-20 |
DE10249754A1 (en) | 2004-05-06 |
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