• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for the measurement of cell-flow resolved flow processes with a rotary displacer {14) and a parallel connected Druckdifferenzaufnehmer in the form of a in a measuring chamber (22) arranged piston (24), a displacement sensor (26) via which a deflection of the piston (24) In the measuring chamber (22) is measured, a drive motor (18) via which the rotary displacement (14) is driven, a rotation angle sensor (36), via which a rotational speed of the drive motor (18) or the rotatory displacer (14 ), wherein the rotational speed of the drive motor (18) is controlled as a function of the pressure difference applied to the translational pressure difference sensor, are known. However, there is the problem that oscillating or pulsating flows can not be continuously absorbed. To solve this problem, it is proposed that the total flow (46) to be determined by summation of the instantaneous flow (44) by the displacer (14) and the instantaneous flow (42) in the bypass (20) due to the deflection of the piston ( 24), wherein the flow in the bypass line (20) is determined from a measured displacement of the piston {24) and the flow through the displacer {14) is determined from a measured speed of the displacer (14) or the drive motor {18) becomes.
    公开号:AT515406A4
    申请号:T492/2014
    申请日:2014-06-23
    公开日:2015-09-15
    发明作者:Manfred Dipl Ing Fh Pross
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    DESCRIPTION
    Method for measuring time-resolved flow processes
    The invention relates to a method for measuring time-resolved flow processes with an inlet into which the fluid to be measured flows, an outlet from which the fluid to be measured flows, a rotary displacer arranged between inlet and outlet, via which fluid is conveyed Pressure difference sensor, which is arranged in a bypass line to the rotary displacer and which consists of a piston arranged in a measuring chamber, a displacement sensor, via which a deflection of the piston in the measuring chamber is measured, a drive motor, via which the rotary displacer is driven, a rotation angle sensor , via which a rotational speed of the drive motor or of the rotary displacer is measured, wherein the rotational speed of the drive motor is regulated as a function of the pressure difference applied to the translatory pressure difference sensor.
    Such systems have been known for many years and are used, for example, for injection quantity measurement in internal combustion engines.
    Thus, DE-AS 1 798 080 describes an electronically controlled flowmeter with an inlet and an outlet, between which a rotary displacer in the form of a gear pump and in a line parallel to the displacer a piston is arranged in a measuring chamber. To determine the flow rate, the deflection of the piston is measured in the measuring chamber by means of an optical sensor. The speed of the gear pump is due to this
    Signal continuously readjusted and in such a way that the piston is always returned to its original position as possible. From the measured via an encoder number of revolutions or partial revolutions of the gear pump and the known delivery volume of the gear pump in one revolution so the flow is calculated within a predetermined time interval. Although the time intervals used can be chosen to be relatively small, an increased resolution can not be achieved.
    DE 33 02 059 A1 discloses a flow device constructed in this way. In order to be able to make statements regarding the delivery quantities, the number of injections and the start of injection, information about the rotational speed of the injection pump, the pulse height and the number of outlets are additionally made available to a computing unit. A statement on the flow rate is not possible without this information.
    Another concept for measuring flow processes is described in DE 103 31 228 B3. The construction of the flowmeter is again substantially the same. To determine the injection flow rates, the gear pump is set to a constant speed before the start of the injection, so that subsequently the movement of the piston is measured and used to determine the injection curves. The setting of a constant flow rate is not possible with continuous flow measurements, as otherwise would result in greatly varying flow rates too large displacement of the piston.
    It is therefore the object to provide a method for measuring temporally resolved flow processes, which can be operated continuously on the one hand and thereby enable a high resolution of the measured flow, without requiring additional software or information about the state of connected components. For example, pulsating flows should be identified. Likewise, a return of the displacer or irregularly shaped gear teeth or uneven running of the displacer by friction should cause no errors in the determined flow.
    This object is achieved by a method for measuring temporally resolved flow processes with the features of claim 1
    By calculating the total flow to be detected by summation of the instantaneous flow through the displacer and the instantaneous flow in the bypass due to the displacement of the plunger, the flow in the bypass being determined from a measured displacement of the plunger and the flow through the displacer is determined from a measured speed of the displacer or the drive motor, it is possible to represent the exact curves of the flow in time resolved, although the displacer is readjusted steadily. By using the actual displacement of the displacer and the actual displacement of the piston, changes in flow are continuously detected without the need for additional input, for example, to actuate or open injection valves. In addition to a direct measurement of the displacer flow, this can also be measured indirectly via the speed of the displacer.
    Preferably, an instantaneous speed of the drive motor or of the rotary displacer is measured via the rotation angle sensor, and the momentary flow through the displacer is calculated from the instantaneous speed and a delivery volume of the displacer per revolution.
    If the flow rate of the displacer is known during one revolution and, on the other hand, the velocity is known, a flow rate at the pump can be determined for any small time intervals. For this purpose, the displaced volume on the piston is added in the selected Zeitlntervall, whereby the desired total flow can be reliably determined.
    In a further embodiment, the instantaneous speed is determined via an optical coder coupled to the displacer or the drive motor by determining the time length of the coder pulses. By measuring the time length of these encoder pulses, the speed and thus the instantaneous flow at the rotary displacer can be determined with high accuracy.
    In a further embodiment, in turn, the lengths of the encoder pulses are measured by means of a timer. This timer is fed with a high clock frequency of for example 66MHz. The resulting clock pulses during a Kodierimpulses be counted accordingly, so that for each pulse of the encoder, the speed is detected and thus a short measurement time is achieved in the determination of the speed of the displacer.
    The timer is preferably operated at a clock frequency of at least 10 MHz, so that fast pulsating currents can be detected.
    In an advantageous alternative embodiment of the invention, the optical encoder on two Kodierspuren on the two 90 ° offset sensor signals are generated, which are read to measure the current) speed in a quadrature counter and then accumulated and numerically differentiated. By using the two offset sensor signals, an absolute position as well as a momentary direction of rotation of the drive motor or of the rotary displacer can be determined continuously. As a result, the current flow can be calculated again with high accuracy. In addition, opposing rotational movements of the displacer can be identified.
    In an alternative embodiment, the instantaneous rotational speed is determined via at least two magnetoresistive sensors coupled to the displacer or the drive motor, which correspond with a magnet which rotates with the drive motor or the displacer and generate two sensor signals which are offset by 90 ° from one another. An absolute rotation angle can likewise be determined via these sensors, since a position of the motor or of the displacer which is unambiguous relative to the rotational angle position can be determined on the basis of the two mutually offset sensors.
    In a particularly preferred embodiment of the invention, the rotation angle sensor is an absolute rotation angle encoder and in a computing unit a table with displacement or motor angle-based support points is deposited, wherein defined absolute rotation angle ranges of the displacer is assigned a volume displaced in this area and from this volume and the determined speed of the displacer a current flow through the displacer is calculated. In this way, each individual angular range of the rotary displacer can be assigned its specific delivery volume. Thus, assembly tolerances or tooth form errors do not affect the determined flow through the rotary displacer. Thus, for all rotation angle ranges of the rotary displacer, the actual available flow rates are used in) the calculation of the flow rate.
    Thus, a method is provided with which time-resolved flow processes can be determined with high accuracy and continuously. It also errors in the flow rate calculation are avoided when oscillations of the flow occur, uneven flow rates of the pump or strong pulsations, which may lead to a backflow occur. All this requires no additional sensors to detect or transmit external data. The system thus works autonomously.
    The method according to the invention will be described below with reference to the figures.
    Figure 1 shows a schematic of the basic structure of a
    Flowmeter for performing the method.
    Figures 2a) to c) show a graphical representation of the calculation of the flow. The flowmeter shown in FIG. 1 consists of an inlet 10, via which a fluid to be measured, in particular a fuel, flows via a flow-generating device, in particular a high-pressure fuel pump and at least one injection valve, into a first line 12 of the measuring device. In this first conduit 12 is; a rotary displacer 14 is arranged in the form of a double gear pump. Downstream of the displacer 14, the first conduit 12 terminates at an outlet 16. The gear pump 14 is driven by a drive motor 18 via a clutch or a transmission. ) From the first line 12 branches off upstream of the rotary displacer 14 from a bypass line 20, which opens downstream of the rotary displacer 14 back into the first conduit 12 and corresponding to the first conduit is fluidly connected to the inlet 10 and the outlet 16, In this Bypass line 20 is a measuring chamber 22, in which in turn a piston 24 is arranged freely displaceable, wherein the piston 24 has the same specific gravity as the measuring fluid, so the fuel and the measuring chamber is cylindrically shaped and has an inner diameter substantially the Outer diameter of the piston 24 corresponds. This piston 24 in the measuring chamber 22 serves as a translatory differential pressure sensor. This means that when a pressure difference between the front side and the rear side of the piston 24 is applied, a deflection of the piston 24 takes place from its rest position. Accordingly, the deflection of the piston 24 is a measure of the applied pressure difference. At the measuring chamber 22, a displacement sensor 26 is arranged, which is in operative connection with the piston 24 and in which by the deflection of the piston 24 a dependent on the size of the deflection of the piston 24 voltage is generated. This displacement sensor 26 attached to the measuring chamber 22 is, in particular, a magnetoresistive sensor, via which the field strength of a magnet 28 acting on it is converted into a voltage. For this purpose, the magnet 28 is fixed in the center of gravity of the piston 24.
    The displacement sensor 26 is connected to a control unit 30, which contains a computing unit 31, which receives the values of this displacement sensor 26 and transmits corresponding control signals to the drive motor 18, which is as much as possible controlled so that the piston 24 is always in a defined starting position. This means that upon deflection of the piston 24 to the right as a function of the size of this deflection, the pump speed is increased and vice versa. For this purpose, the deflection of the piston 24 or displaced by it i volume in the measuring chamber 22 by means of a transfer function in a desired delivery volume of the gear pump 14 or a rotational speed of the drive motor 18 and the drive motor 18 is energized accordingly.
    In the measuring chamber 22, a pressure sensor 32 and a temperature sensor 34 are arranged between the piston 24 and the injection device, which continuously measure the pressures and temperatures occurring in this area and in turn the control unit 30 to account for changes in density in the calculation can.
    The flow of the measurements is such that in the calculation of an overall flow 46 to be determined in the arithmetic unit 31, both a flow 42 formed in the measuring chamber 22 by the movement or position of the piston 24 and the volume displaced thereby in the bypass line 20 as well as an actual flow Flow 44 of the gear pump 14 are taken into account in a fixed time interval and both flow rates 42, 44 are added together to determine the total flow 46.
    The determination of the flow 42 on the piston 24 takes place in the computing unit 31, which is connected to the displacement sensor 26, the deflection 40 of the piston 24 is differentiated and then multiplied by the base area of the piston 24, so that a volume flow in the Bypass line 20 in the time interval results.
    In contrast to known embodiments, however, the flow 44 is not determined by the gear pump 14 and thus in the line 12 from the determined control data for controlling the gear pump 14, but calculated on the speed, which is measured directly on the gear pump 14 or the drive motor 18 ,
    This measurement takes place, for example, via a rotation angle sensor 36, which is designed as an optical encoder 38 and is likewise connected to the arithmetic unit 31. About this encoder 38, a certain number of pulses per revolution is output, so that there is a dependent on the number of pulses resolution. In order to be able to determine the rotational speed with a better resolution, according to the invention, the time is counted up during an encoder pulse by means of a timer. Such a timer can be operated, for example, with a clock frequency of 66 MHz, so that a high resolution arises. Good results are achieved from a clock frequency of about 10 MHz. Now, if the speed is known in a narrow time interval, the flow through the gear pump 14 by means of this speed and the known flow rate in one revolution of the gear pump 14 can be calculated.
    Alternatively, it is possible to use a quadrature counter instead of the timer. For this purpose, two coding tracks are formed on the optical encoder, which generate two mutually offset by 90 ° signals. These signals are read into a quadrature counter and then accumulated its count. By a following numerical differentiation also results in the current speed of the displacer 14 and the drive motor 18. About the quadrature counter and a reverse rotation of the gear pump 14 is determined, since the counter then counts backwards. Thus, errors in strong pulsations are avoided, which can lead to such a reverse rotation of the gear pump 14.
    Of course, the values of the timer and the quadrature counter are likewise supplied to the arithmetic unit 31.
    Alternatively, it would also be possible, instead of the optical encoder 38 as a rotation angle sensor 36 to use two mutually offset magnetoresistive sensors that communicate with a fixed for a while of the drive motor 18 or the gear pump 14 permanent magnet, the movement corresponding to two staggered continuous voltage waveforms in the Generates sensors that can be read out. Two such, for example, offset by 90 ° to each other signals also allow the determination of the absolute rotation angle at any time and thus an accurate measurement of the instantaneous speed.
    With these embodiments, fluctuations in the delivery of the displacer 14 due to friction or the like as well as occurring pulsations can be detected, since at any given time the currently existing flow rate 44 of the gear pump 14 can be determined via the currently measured rotational speed.
    In addition, it is possible to calculate out fluctuations in the delivery of the displacer 14, which arise, for example, from not exactly the same design of the teeth of a gear pump 14, by assigning each angular range of the displacer 14, for example in 1 ° steps, to a specific delivery volume. This can be stored in corresponding support points in software of the arithmetic unit 31, so that not only the instantaneous speed is used to calculate the flow rate 44, but additionally the flow rate to be expected in this rotation angle range is used in the calculation. Thus, even low pulsations can be eliminated by the teeth of the pump 14 of the pump.
    Even strong occurring oscillations in the flow 48 to be determined can be reproduced by the methods according to the invention, as shown in FIG.
    FIG. 2a) shows first the measured deflection 40 of the piston 24 and a flow 41 resulting from the discharge of the deflection 40 in the measuring chamber 22 or the bypass 20 in mm3 / s in the presence of an oscillating flow 48.
    FIG. 2 b) shows a flow 42 in the bypass line 20 converted from the flow 41 in l / h and the measured flow 44 of the gear pump 14. Summation of these two curves results in the course shown in FIG. 2 c) for the resulting flow 46. which corresponds exactly to the impressed flow 48.
    Accordingly, it is possible with the described method to reproduce dynamic flow processes down to the kHz range. It is a free-running measurement without external trigger signals. Pulsations that cause backflow at the gear pump or oscillations and uneven promotion by the gear pump by friction or differently shaped teeth of the pump no longer affect the result, which is determined correctly.
    It should be understood that the invention is not limited to the embodiment described, but various modifications are possible within the scope of the main claim. In particular, it is conceivable to use different sensors for determining the rotational speed of the displacer or to measure in another way the flow rate at the displacer.
    权利要求:
    Claims (8)
    [1]
    A method for measuring time-resolved flow-through processes with an inlet (10), into which the fluid to be measured flows, an outlet (16), from which the fluid to be measured flows, between an inlet (10) and outlet (16). arranged rotary displacer (14) via which fluid is conveyed, a pressure difference sensor which is arranged in a bypass line (20) to the rotary displacer (14) and which consists of a in a measuring chamber (22) piston (24), a displacement sensor (26), via which a deflection of the piston (24) in the measuring chamber (22) is measured, a drive motor (18) via which the rotary displacer (14) is driven, a rotation angle sensor (36) via which a speed of the Drive motor (18) or the rotary displacer (14) is measured, the speed of the drive motor (18) in response to the pressure difference applied to the translational pressure difference sensor gerege lt is characterized in that the total flow (46) to be determined is calculated by summing the instantaneous flow (44) through the displacer (14) and the instantaneous flow (42) in the bypass (20) due to the deflection of the plunger (24) is determined, wherein the flow in the bypass line (20) from a measured deflection of the piston (24) is determined and the flow through the displacer (14) from a measured speed of the displacer (14) or the drive motor (18).
    [2]
    2. A method for measuring temporally resolved flow processes according to claim 1, characterized in that via a rotation angle sensor (36) the instantaneous speed of the drive motor (18) or the rotary displacer (14) is measured and from the current speed and a displacement of the displacer (14) per revolution the instantaneous flow (44) is calculated by the displacer (14).
    [3]
    3. A method for measuring time-resolved flow processes according to any one of claims 1 or 2, characterized in that the instantaneous speed is determined by a with the displacer (14) or the drive motor (18) coupled to the optical encoder (38) by the temporal Length of the encoder pulses is determined.
    [4]
    4. A method for measuring time-resolved flow processes according to claim 3, characterized in that the lengths of the encoder pulses are measured by means of a timer.
    [5]
    5. A method for measuring time-resolved flow processes according to claim 4, characterized in that the timer is operated with a clock frequency of at least 10 MHz.
    [6]
    6. A method for the measurement of time-resolved flow processes according to claim 3, characterized in that the optical encoder (38) has two Kodierspuren over the two offset by 90 ° sensor signals are generated, which are read to measure the instantaneous speed in a quadrature counter and then accumulated and numerically differentiated.
    [7]
    7. A method for measuring time-resolved flow processes according to any one of claims 1 or 2, characterized in that the instantaneous speed is determined by at least two with the displacer (14) or the drive motor (18) coupled magnetoresistive sensors with a magnet, which rotates with the drive motor (18) or the displacer (14) correspond, and generate two sensor signals which are offset by 90 ° to each other.
    [8]
    8. A method for measuring time-resolved flow processes according to any one of the preceding claims, characterized in that the rotation angle sensor (36) is an absolute rotation angle sensor and in a computing unit (31) a table with displacement or motor angle based support points is deposited, wherein defined Absolutdrehwinkekeelelchen the displacer (14) a volume displaced in this area is assigned and from this volume and the determined rotational speed of the displacer (14) an instantaneous flow rate (44) through the displacer (14) is calculated.
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2015197575A1|2015-12-30|
    AT515406B1|2015-09-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2185785A|1986-01-25|1987-07-29|Ford Motor Co|Gear pump type liquid flow meter|
    AT504605B1|2008-03-10|2009-06-15|Avl List Gmbh|DEVICE FOR MEASURING TIME-RELATED VOLUMETRIC FLOW PROCESSES|
    DE10331228B3|2003-07-10|2005-01-27|Pierburg Instruments Gmbh|Device for measuring time-resolved volumetric flow processes|
    AT512619B1|2013-06-26|2015-02-15|Avl List Gmbh|Flowmeter|AT521356B1|2018-07-18|2020-01-15|Avl List Gmbh|Differential pressure transducer for a flow meter and flow meter|
    法律状态:
    2016-07-15| HA| Change or addition of new inventor|Inventor name: CHRISTIAN THOMAS BERGER, AT Effective date: 20160601 Inventor name: MANFRED PROSS, AT Effective date: 20160601 Inventor name: HERWIG BREITWIESER, AT Effective date: 20160601 Inventor name: MARTIN DUERRWAECHTER, DE Effective date: 20160601 Inventor name: HERIBERT KAMMERSTETTER, AT Effective date: 20160601 Inventor name: OTFRIED DERSCHMIDT, AT Effective date: 20160601 |
    2021-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20200623 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA492/2014A|AT515406B1|2014-06-23|2014-06-23|Method for measuring time-resolved flow processes|ATA492/2014A| AT515406B1|2014-06-23|2014-06-23|Method for measuring time-resolved flow processes|
    PCT/EP2015/064038| WO2015197575A1|2014-06-23|2015-06-23|Method for measuring time-resolved throughflow processes|
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