• 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:
    For functional testing of an arrangement for dynamic fuel consumption measurement, at least two reference flows are produced by successively operating a system pump (6) for the controlled fuel flow without any provision at different frequencies and the gradient determined from the different reference measured values determined is compared with the known gradient of the characteristic curve of the system pump (6) ,
    公开号:AT513535A2
    申请号:T50091/2014
    申请日:2014-02-06
    公开日:2014-05-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    AV-3586 AT
    Method for functional testing of an arrangement for dynamic fuel consumption measurement
    The invention relates to a method for functional testing of an arrangement for dynamic fuel consumption measurement, wherein reference measured values at specific reference flows are recorded at a flow sensor provided for the actual measurement of the dynamic fuel consumption and compared with the expected measured values.
    In particular, for research and development on internal combustion engines, it is important to measure fuel consumption - that is the actually injected into the combustion chamber of the internal combustion engine fuel mass per unit time - up-to-date and accurate. The supply of the internal combustion engine on the test bench or in the respective application with liquid fuel, such as gasoline or diesel, usually takes place from a tank from which the fuel is supplied by gravity or by means of a fuel pump to a consumption sensor for measuring the fuel inlet and further to a conditioning unit in which, on the one hand, a required overpressure or underpressure of the fuel is adjusted by means of a pump and optionally by means of pressure regulators and, on the other hand, and above all a defined fuel temperature with a heat exchanger. Naturally, the most important component is the flow sensor provided for the actual measurement of the dynamic fuel consumption, the correct function of which must therefore be checked at least from time to time. For this purpose, a reference flow is usually provided whose flow rate is known and / or regulated and can be compared with the measured value actually measured.
    Although the described provision of a reference flow allows advantageously an absolute calibration of the flow sensor, but requires extensive and correspondingly expensive precautions and additional process steps that are not suitable or hindering for a quick functional test of the overall arrangement.
    Object of the present invention is therefore to improve a method of the type mentioned so that a quick functional test, for example, every commissioning of the fuel consumption measurement can be performed without justified for an absolute calibration of the flow sensor rather only at longer intervals justified extensive precautions or additional conversions and additions to the arrangement are required.
    This object is achieved according to the present invention in that at least two reference flows through successive operation of one for the regulated force-1
    AV-3586 AT material flow in the arrangement without the system pump provided at different frequencies are generated, and that the determined from the determined different reference measured values gradient is compared with the known gradient of the characteristic curve of the system pump. It is thus no additional expenditure on equipment and no conversion to the arrangement for fuel consumption measurement necessary - the characteristic curve of the system pump or the dependence of the flow of the frequency or speed of the pump defining gradient of the characteristic curve of the system pump is mostly from data sheets of Manufacturer known or can be easily determined in advance in a corresponding series of measurements. Since the gradient of the characteristic curve of the system pump does not depend on the system pressure or the delivered medium, the difference between the two reference measurements can be directly compared with the known gradient of the system pump characteristic curve without any operating conditions (pressure, medium, ...). for this simple function test of the flow sensor would have to be considered. In the determination of the reference measured values, the total delivery rate of the system pump is expediently diverted via the flow sensor, while during normal operation (in the case of the dynamic fuel consumption measurement) only the consumption of the test object flows via the flow sensor. This diversion can be done either automatically or manually, for example via a three / two-way valve, which only slightly increases the additional effort.
    In a further preferred embodiment of the method according to the invention can be taken on an output side of the arrangement for the control and maintenance of the system pressure anyway provided pressure sensor additionally several, preferably three, pressures at several, preferably three, different pump frequencies / Referenzdurchflüssen and with the for these pump frequencies / reference flows to expected pressure values are compared. Thus, not only the function of the flow sensor can be checked with the method according to the invention but also the function of the system pump can be tested. If the function is correct, the system pump delivers a defined pressure on the output side for a defined pump frequency or the associated reference flow. Now, as described, the existing, provided for the control and maintenance of the system pressure pressure sensor is used to measure the output pressure for several, for example, three different pump frequencies can be simply deduced from the standard deviation of the three associated measured pressures on the correct operation of the pump.
    In a further preferred embodiment of the invention, it is provided that a plurality of, preferably three, temperatures 2 3/9 are arranged via a temperature sensor arranged on the output side of a conditioning unit provided for conditioning the temperature
    AV-3586 AT are recorded at a plurality, preferably three, different pump frequencies / reference flows whose deviation from an average value is used as a statement about the correct function of the conditioning unit. As described, the conditioning unit is responsible, inter alia, for a constant temperature in the fuel which is a prerequisite for valid measurement results. In the manner described, the temperature stability can be determined very simply for three different flow rates (pump frequencies). For this purpose, the temperature is usually measured after a certain waiting time after setting a certain pump frequency - the maximum deviation of the temperature from an average must then be within a certain range - if this is the case for all three reference flows (pump frequencies) can be assumed that the Temperature conditioning works correctly.
    The pressure and temperature measurements for the check of the pump function and the function of the temperature conditioning can be made for the sake of simplicity at the same pump frequencies / reference flows, but this is not absolutely necessary.
    The invention will be explained in more detail below with reference to the drawings. 1 shows a schematic representation of an exemplary arrangement for dynamic fuel consumption measurement, and FIG. 2 shows a flow chart for carrying out the method according to the invention on an arrangement according to FIG. 1.
    Normal function of the arrangement according to FIG. 1: Via the fuel inlet A, fuel passes from the building services engineering into the fuel measuring system and then via the connection B to an internal combustion engine (not shown here).
    The pre-circulation pump 1 rotates at the frequency which is set in the frequency converter 10 and thus generates the pre-pressure set at the pressure regulator 2 which is required for the function of the flow sensor 3. The pressure regulator 4 adjusts the so-called return pressure if the measuring system is used on an internal combustion engine with return (not shown). The system pump 6 (here measuring circuit pump) rotates with the frequency set at the frequency converter 11 and thus generates a pressure set at the bypass pressure regulator 9, which can be measured at the pressure sensor 7. Typically, a conditioning unit 13 is used to condition the fuel to a preset temperature. The outlet temperature can be measured at the temperature sensor 8.
    In the instrument controller 12, the measured values are collected and further charged during the function check. The purge valve 5 is normally used to create a connection between pre-circuit and measuring circuit and air bubbles, by means of a Gasblasenabscheiders, from 3 4/9
    AV-3586 AT the system to remove (is not shown for reasons of simplification) In normal operation, the valve is switched as shown in the drawing.
    Function of the arrangement according to FIG. 1 in the function check with reference to FIG. 2:
    In the STANDBY state (both pumps 1 and 6 are running, the flow sensor 3 is ready to measure and the conditioning unit 13 has adjusted a certain temperature (measured at the temperature sensor 8).) The function test is started by a command (in our case SFCN).
    The measuring circuit pump (system pump 6) now moves to the frequency F1 predetermined by the frequency converter 11. Thereafter, the purge valve 5 is opened, that is, the pumped by the system pump 6 circulating volume now no longer runs in a circle but is nachgefördert on the Vorkreispumpe 1 and is therefore measurable at the flow sensor 3. Next, wait for T1 seconds to give the system time to stabilize. The flow rate V1 is then measured in l / h at the flow sensor 3 and averaged over T2 seconds. Thereafter, the system pump 6 moves to the predetermined frequency of the frequency converter 11 F2. Another pause of T1 seconds. The second flow value V2 is measured with the flow sensor 3 in l / h and averaged over T2 seconds. Thereafter, the vent valve 5 is closed again (normal operation).
    From the two flow rates V1 and V2, the slope M is then calculated as indicated in FIG. This slope is compared with the reference value D of the system pump 6. If the difference in magnitude is smaller than a definable threshold S, the sensor test is considered passed.
    Thereafter, the system pump drives the frequency F3, pause for T1 .... Then for T2 seconds on the one hand, the pressure P1 measured at the pressure sensor 7 and averaged, on the other hand, the temperature stability K1 is determined at the end of T2 seconds. There are several ways to determine the temperature stability. In our case, a sliding window is used within which the maximum deviation of the temperature from the mean over the whole window is calculated. Default values are here: If the maximum temperature deviation within the last 10 seconds from the average of the last 10 seconds is less than 0.1 ° C, the temperature control is considered to be stable or regulated. The temperature stability check is constantly determined by the instrument controller 12 based on the outlet temperature at the temperature sensor 8.
    This procedure is repeated twice for K2 or P2 and K3 or P3. Subsequently, the measurements are evaluated on the Instrument Controller 12. 4 5/9
    AV-3586 AT
    If all three temperature stability values K1, K2 and K3 = 1, then the temperature control is considered functional. If the standard deviation of the averaged pressures P1, P2 and P3 is less than a parameterisable limit value PJim, then the pressure control is considered functional.
    Apart from the use of the measuring circuit pump (6) could of course another system provided in the system anyway pump, such as here the Vorkreispumpe 1, are used in the manner described for the functional test of the invention, which only requires other switching options in the arrangement of FIG. 5 6/9
    权利要求:
    Claims (4)
    [1]
    AV-3586 AT Claims 1) Method for functional testing of an arrangement for dynamic fuel consumption measurement, in which reference measured values are recorded at specific reference flows and compared with the thereby expected measured values at a flow sensor (3) provided for the actual measurement of the dynamic fuel consumption, characterized in that at least two reference flow rates are produced by successively operating a system pump (6) provided for the controlled fuel flow in the arrangement without any difference at different frequencies, wherein the total flow rate of the system pump (6) is diverted via the flow sensor (3) and that of the thereby detected gradient determined different reference measured values is compared with the known gradient of the characteristic curve of the system pump (6).
    [2]
    2) Method according to claim 1, characterized in that on the output side of the arrangement for the control and maintenance of the system pressure without further measures provided pressure sensor (7) additionally several, preferably three, pressures at several, preferably three, different pump frequencies / reference flows recorded and with the for These pump frequencies / reference flows to expected pressure values are compared.
    [3]
    3) Method according to claim 1 or 2, characterized in that a plurality of, preferably three, temperatures are recorded at a plurality of, preferably three, different pump frequencies / reference flows via an output side of a priority provided for conditioning temperature conditioning unit 13 temperature sensor (8) whose deviation from an average is used as a statement about the correct function of the conditioning unit 13.
    [4]
    4) Method according to claim 2 and 3, characterized in that the pressure and temperature measurements are made at the same pump frequencies / reference flows. 6 7/9
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    引用文献:
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    DE102011100029C5|2011-04-29|2016-10-13|Horiba Europe Gmbh|Device for measuring a fuel flow and calibration device therefor|
    NZ706990A|2012-10-15|2017-12-22|Orion Corp|A veterinary method of alleviating noise aversion|
    AT512724B1|2013-07-12|2015-02-15|Avl List Gmbh|Device and method for the continuous measurement of the dynamic fuel consumption of an internal combustion engine|AT514517B1|2014-11-05|2016-06-15|Avl List Gmbh|Method and device for operating a pump|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50091/2014A|AT513535B1|2014-02-06|2014-02-06|Method for functional testing of an arrangement for dynamic fuel consumption measurement|ATA50091/2014A| AT513535B1|2014-02-06|2014-02-06|Method for functional testing of an arrangement for dynamic fuel consumption measurement|
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    US14/613,564| US9835485B2|2014-02-06|2015-02-04|Method for functional testing of arrangement for dynamic fuel consumption measurement|
    KR1020150017718A| KR101676943B1|2014-02-06|2015-02-05|Method for functional testing of arrangement for dynamic fuel consumption measurement|
    JP2015021103A| JP5967847B2|2014-02-06|2015-02-05|Function test method for dynamic fuel consumption measuring device|
    CN201510149637.1A| CN104833405B|2014-02-06|2015-02-06|Method to carrying out functional check for the equipment of dynamic fuel consumption measurement|
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