• 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 fuel consumption measuring systems having a fuel delivery line (14) via which a first fuel pump (12) via which fuel can be conveyed from a tank (10) can be fluidically connected to a consumer (16) of a fuel consumption measuring device (28) the fuel delivery line (14) is arranged, one at the consumer (16) branching and between the Kraftstoffverbrauchsmessvorrichtung (28) and the consumer (16) into the fuel delivery line (14) opening out the first fuel return line (26), one between the first fuel pump (12) and the fuel consumption measuring device (28) branches off the fuel delivery line (14) and opens on the tank (10) second fuel return line (5O) and a heat exchanger (52) via which the fuel from the second fuel return line (50) heat from the fuel of the first fuel return line ( 26) withdraws. In the fuel return lines (26, 50) are means (54, 56, 62) for adjusting equal volume flows at an orifice (53) of the first fuel return line (26) in the fuel delivery line (14) and at a branch (58) from the fuel delivery line ( 58) are arranged in the second fuel return line (50).
    公开号:AT515306A4
    申请号:T590/2014
    申请日:2014-07-24
    公开日:2015-08-15
    发明作者:Martin Dr Dürrwächter；Michael Ing Tauch
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Fuel consumption measuring system and method for measuring a fuel consumption of an internal combustion engine
    The invention relates to a fuel consumption measuring system with a fuel delivery line, via which a first fuel pump, via which fuel is conveyed from a tank, with a consumer fluidly connected, a fuel consumption measuring device, which is arranged in the fuel delivery line, a first fuel return line, which branches off at the consumer and between the fuel consumption measuring device and the consumer in the fuel delivery line, a second fuel return line, which branches off between the first fuel pump and the fuel consumption meter from the fuel delivery line and opens at the tank and a heat exchanger, via which the fuel from the second fuel Rückführleltung heat from the fuel of the first fuel return line withdraws and a method for measuring a fuel consumption of an internal combustion engine with such a fuel consumption metering system in which fuel is conveyed from a tank to a consumer via a first fuel pump, wherein a fuel consumption measuring device measures the volume flow of the delivered fuel.
    Such systems usually consist of a module which carries out the actual measurement of the fuel flow and, in the case of measuring systems which have a fuel return, additionally of a conditioning module, via which the fuel returned by the engine is returned to the delivery line downstream of the flow meter becomes. The fuel consumption measuring device consists in particular of a flow meter, as described in DE-AS 1 798 080. It is an electronically controlled flow meter 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 in the measuring chamber is measured by means of an optical sensor. The speed of the gear pump is continuously readjusted due to this signal, in such a way that the piston is always returned to its original position. 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. Return currents from the engine can not be measured with such systems.
    These systems for fuel consumption measurement with conditioning device are arranged, for example, in front of the high-pressure fuel pump of a common rail system with a plurality of injection valves. These are closed circuits. Alternatively, it is in principle conceivable to provide a return line to the tank and to arrange a second flow meter in it, so that the fuel consumption can be calculated from the difference between the two flow meters. However, it has been found that such systems do not provide sufficiently accurate results due to the very high recirculation rates, which may be about ten times and, in extreme cases, up to one hundred times that of fuel consumption.
    For this reason, systems for fuel consumption measurement have become known, as disclosed for example in DE 197 81 795 TI. The system described herein has only one flow meter located in the delivery line leading from the tank to the consumer. In front of the flowmeter branches off a line which leads back to the tank and in which a pressure control relief valve is arranged, via which the pressure in the supply line can be adjusted. A first return line branches off immediately in front of the consumer and flows behind the flow meter back into the Forderieitung. Both return lines are combined in a heat exchanger so that the warmer fuel from the first return line is cooled by the colder fuel from the second return line so that the temperature of the fuel returned from the first return line is about the temperature of the fuel in the delivery line equivalent. In the delivery line is located in front of the mouth of the first return line and behind the flow meter also a pressure reducer. Behind the mouth of the first return line, a further feed pump is arranged. Since the fuel pressure as well as the temperature in the second feedback loop and in the first feedback loop can be kept substantially the same, the flowmeter measures the fuel consumption with good accuracy.
    However, problems occur in operating conditions in which the recirculated fuel flow is greater than the funded fuel flow. Such a condition may occur, for example, at the start of a diesel engine or at the transition from full load to idle. The arranged in the delivery line pressure reducer prevents backflow toward the tank, whereby an undesirable increase in pressure in the return line is formed. This affects the performance of the internal combustion engine and can even lead to damage to aggregates.
    Furthermore, it is common in modern internal combustion engines to use a pump control in which the flow rate is adapted to the expected fuel consumption in order to save energy. However, the control of the pump leads to pressure changes in the delivery line, at the same time trying the pressure control valves during the measurement to establish a constant pressure in the delivery line and in the return line. This leads to an influence of the internal combustion engine, which can lead to a superposition with the pressure control of the internal combustion engine is the result, which can lead to errors in the engine management.
    It is therefore an object to provide a fuel consumption measurement system and a method for measuring a fuel consumption of an internal combustion engine, with which these problems can be avoided. Accordingly, it should be possible to perform an accurate consumption measurement without having to keep the pressure in the system constant. Also, return flows through the flow meter should be allowed.
    This object is achieved by a fuel consumption measuring system with the features of claim 1 and a method for measuring a fuel consumption of an internal combustion engine having the features of claim 9.
    With regard to the fuel consumption measuring system, means are arranged in the first fuel return line and in the second fuel return line via which an equal volume flow at an opening of the first fuel return line into the fuel delivery line and at a branch from the fuel delivery line to the second fuel return line is adjustable.
    With respect to the method of measuring fuel consumption, during the measurement of fuel consumption, the volume flow in a first fuel return line through which fuel flows from the consumer back to a delivery line between the consumer and the fuel consumption meter and in a second fuel return line via the fuel from the delivery line back to Tank is promoted, regulated to an equal reading. This ensures that the system has no influence on the interaction between the fuel supply and the engine, in particular the performance and control of the internal combustion engine. This means that the measurements are made on the combustion engine under the same conditions as if no measuring system were used. Accordingly, the pressure changes are not superimposed by the control of the pump by the regulations of the measuring system. Return flows through the flowmeter are also possible and can be detected. Since there are no subsequent control units behind the flow meter necessary, this can be placed close to the consumer, so that the external hydraulic volume decreases, which also improves the measurement results.
    Preferably, a flow meter in the second fuel return line and in the first fuel return line is arranged as a means for generating equal volume flows from the fuel delivery line into the second fuel return line and the first fuel return line in the fuel delivery line, both flow meters are electrically connected to a volume flow control unit. These two flowmeters can be used to verify that the flow rates in both return lines have been set to the same value, thereby ensuring that the fuel measurement does not affect the actual instantaneous fuel consumption.
    In addition, as a means for generating equal volume flows in the fuel return lines in the second fuel return line, a control valve is arranged, which is controllable via the volume flow control unit, which is connected to the flow meters. The method provides that the volume flow of the fuel in the first fuel return line is measured via a first flow meter and the volume flow of the fuel in the second fuel return line is measured via a second flow meter, and a control valve In the second fuel return line is controlled via a volume flow control the volume flow in the second fuel return line is regulated to the same value as the volume flow in the first fuel return line. This means that the control valve regulates the volume flow in the second return line to the same volume flow as in the first return line as a function of the measured values of the flow meter, so that with simple means there is a balance between the volume flows conducted to the delivery line and the volume flows taken from the delivery line , Accordingly, the actual fuel consumption is measured at the flow meter. Such a conditioning module is easy to produce.
    Furthermore, a second fuel pump is advantageously arranged in the first fuel return line. Using these, the pressure in the first return line can be set to values that correspond to those without a measuring system.
    In this case, preferably, the second fuel pump is electrically connected to a pressure control unit, which is electrically connected to a pressure sensor, which is arranged in the first fuel return line upstream of the heat exchanger. With regard to the method, the pressure of the fuel in the first fuel return line is thus measured via a pressure transducer and regulated via a pressure control unit, a second fuel pump downstream of the heat exchanger and upstream of the mouth of the first fuel return line such that in the first fuel return line a constant pressure applies The pressure during the measurement in the first return line, is thus regulated to an average pressure in the first return line outside the measuring times, so that in the return line during the measurements always a constant pressure is applied, whereby pressure fluctuations in the delivery line are not superimposed.
    In a preferred embodiment of the invention, a rotary displacer is formed in the fuel consumption measuring device and a measuring chamber in a bypass line to the rotary displacer, in which a piston is arranged, wherein the rotary displacer is drivable in dependence of the deflection of the piston.
    Such flowmeters work very precisely and correctly reproduce even short-term changes in consumption.
    In order to switch easily between the consumption measurement and the normal operation of the internal combustion engine and to use the system inline on a moving vehicle, a bypass valve is arranged in the first fuel return, via which the fuel from the first fuel return line either to the heat exchanger or via a bypass channel back to the tank is feasible. For the method, this means that a fuel flow from the first fuel return line via a bypass line bypassing the heat exchanger is fed back into the tank via a bypass valve and the control valve closes the second fuel return line outside the measurement times.
    It is particularly advantageous if the first flow meter and the second fuel pump are arranged downstream of the heat exchanger in the first fuel return line and the second flow meter and the control valve are arranged upstream of the heat exchanger in the second fuel return line. Thus, the means for controlling the volume flows on the cold side of the heat exchanger, in which there are approximately equal temperatures, whereby the temperature influence on the control is significantly reduced.
    In a preferred embodiment of the fuel consumption measurement method, the temperature of the fuel in the first fuel return line upstream of the orifice into the fuel delivery line is approximately cooled to the temperature of the fuel in the tank by the heated fuel in the first fuel return line and the unheated fuel in the second fuel return line serve as heat exchange media of a heat exchanger. Thus, the temperature of the fuel leaving the delivery line and the temperature of the returned to the delivery line
    Fuel set to approximately the same values, so that no mass flow differences due to different temperatures occur. In addition, heating of the fuel in the delivery line or in the tank is avoided.
    Thus, there is provided a fuel consumption measurement system and a fuel consumption measurement method that can sequentially determine timed flow events with high accuracy. It also errors in the flow rate calculation are avoided when oscillations of the flow occur, uneven delivery rates of the pump are present or strong pulsations, which may lead to a backflow, are available. All this requires no additional sensors to detect or transmit external data. The system thus works autonomously.
    The fuel consumption measuring system according to the invention is shown in the figures and will be described below as well as the associated method for measuring fuel consumption with reference to the figures.
    FIG. 1 shows a flow chart of a fuel consumption measuring system according to the invention.
    Figure 2 shows a schematic of a fuel consumption measuring device as used advantageously in the fuel consumption measuring system.
    The fuel consumption measuring system shown in Figure 1 consists of a tank 10, is stored in the fuel. From this tank 10, fuel is pumped into a fuel delivery line 14 by means of a first fuel pump 12. The fuel delivery line 14 leads to a consumer 16, which is designed in this embodiment as an internal combustion engine 18 with common rail injection system. Accordingly, the fuel delivery line 14 leads to a high-pressure pump 20, via which the fuel is conveyed and compressed into a common-rail distributor pipe 22. The manifold 22 is fluidly connected to injectors 24 through which the fuel is injected into the combustion chambers of the engine 18. Usually, larger amounts of fuel are conveyed in these systems than are actually injected via the injection valves 24, so that a first fuel return line 26 branches off from the manifold 22, which leads back to the tank 10. The quantities of fuel returned can amount to a multiple of the injected quantities of fuel.
    In order to measure the consumption of the fuel, a fuel consumption measuring device 28 is arranged in the fuel delivery line 14. This can in particular, as shown in Figure 2, be configured.
    In the fuel delivery line 14 is for measuring a rotary displacer 30, for example arranged in the form of a double gear pump. The rotary displacer 30 is driven by a drive motor 32 via a clutch or a transmission.
    From the fuel delivery line 14 branches off upstream of the rotary displacer 30 from a bypass line 34, which opens downstream of the rotary displacer 30 back into the fuel delivery line 14. In this bypass line 34 is located in a measuring chamber 38 freely displaceable piston 40, which has the same specific gravity as the measuring fluid, so the fuel, so that it moves inertia-free with the fuel according to the present in the bypass line 34 volume storms. The measuring chamber 38 is cylindrically shaped and has an inner diameter that substantially corresponds to the outer diameter of the piston 40. If a volume flow change occurs in the fuel delivery line 14, this initially results in a deflection of the piston 40. This deflection is measured by means of a displacement sensor 42 and the measured values are made available to a control unit 44, which receives the values of this displacement sensor 42 and transmits corresponding control signals to the drive motor 32, which is controlled in such a way that the piston 40 is always returned to its defined starting position. the volume flow is thus always as accurately as possible via the rotary displacer 30 is discharged. This means that upon deflection of the piston 40 to the right in dependence on the size of this deflection, the rotational speed of the rotary displacer 30 is increased and vice versa. For this purpose, the deflection of the piston 40 or the volume displaced by it in the measuring chamber 38 by means of a Obertragungsfunktion in a desired delivery volume of the rotary displacer 30 or a rotational speed of the drive motor 32 is converted and the drive motor 32 energized accordingly.
    Since each rotational speed of the rotary displacer 30 can be assigned a volume delivered in the time interval, it is correspondingly possible to calculate a fuel consumption from these values. There is no additional pressure difference across the meter, which does not affect the measurement. Therefore, no leaks can occur via the displacer 30 and there are no flow-dependent measurement errors.
    However, in the system described so far, the total fuel flow including the recirculated fuel would be measured. To avoid this and in fact to measure only the amount of fuel injected at the fuel consumption meter 28, two separate fuel return lines are used during the measurement times. First, in the first fuel return line 26, a bypass valve 46 is arranged, via which the fuel flow from the first fuel return line 26 can flow into a second branch 48 of the first fuel return line 26 downstream of the
    Fuel consumption measuring device 28 opens into the fuel delivery line 14. In addition, from the fuel delivery line 14, a second fuel return line 50 branches off upstream of the fuel consumption meter 28, which leads back to the tank 10.
    The two fuel streams of the two fuel return lines 26, 50 are in heat exchanging contact with each other via a heat exchanger 52. This means that the fuel flow recirculated and heated via the consumer from the first fuel return line 26 gives off heat to the cooler fuel flow from the second fuel return line 50, so that the temperature of the fuel flow coming from the first fuel return line 26 into the fuel delivery line 14 is substantially equal to the temperature of the fuel flow from the fuel delivery line 14 via the second fuel return line 50 branched fuel flow corresponds.
    Furthermore, means are arranged in the two fuel return lines 26, 50, via which it is possible to set the volume flows in both fuel return lines 26, 50 to the same measured values, with the result that only the fuel actually consumed is measured on the fuel consumption measuring device 28. Specifically, these means consist of two flow meters 54, 56, of which a first flow meter 54 in the first fuel return line 26 between the heat exchanger 52 and the mouth 53 of the first fuel return line 26, and the other, second flow meter 56 in the second fuel return line 50 between the Branch 58 is disposed from the fuel delivery passage 14 and the heat exchanger 52. Both flowmeters 54, 56, which may for example be designed as simple turbine meters, are electrically connected to a volumetric flow control unit 60. Via this volume flow control unit 60, a control valve 62, which is arranged between the second flow meter 56 and the heat exchanger 52 in the second fuel return line 50, so controlled that in both fuel return lines 26, 50 during the measurement times an equal volume flow is measured.
    In order to additionally ensure that no changed pressure conditions exist compared to normal operation without measuring the fuel consumption, but existing pressure pulsations or changes by regulating the high-pressure pump 20 or the first fuel pump 12 are also reproduced correctly during the measurement times, the pressure in the first fuel return line 26 is set by means of a second fuel pump 64 in the first fuel delivery line 26 between the heat exchanger 52 and the first flow meter 54 to a value corresponding to an average value of the pressure In the first fuel return line 26 outside the measurement times. In order to be able to control the second fuel pump 64 accordingly, in the first fuel return line 26 upstream of the bypass valve 46, a pressure sensor 66 is arranged, which is connected to a pressure control unit 68, via which the second fuel pump 64 is controlled. Since it is a system open to the fuel delivery line 14, a substantially equal pressure will be established at the branch 58 in the second fuel return line 50 and at the mouth 53 of the first fuel return line 26 in addition to the same volume flow. Thus, upstream of the fuel consumption measuring device 28, a fuel flow leaves the fuel delivery line 14, which substantially corresponds to the fuel flow both in terms of the temperature due to the heat exchanger 52, as well as the pressure and the volume flow due to the regulation by means of the control valve 62 and the two flow meters 54, 56 which is fed back to the fuel delivery line 14 via the first fuel return line 26 downstream of the fuel consumption measuring device 28, as a result of which the measured values of the fuel consumption measuring device 28 are not influenced by the supply and discharge.
    As a result, the actual fuel flow actually consumed is measured at the fuel consumption meter 28, without any internals in the fuel delivery line 14 that would result in a pressure loss or affect the flow in any other way. Accordingly, for example, backflows are also sensed on the fuel consumption measuring device 28, as they arise, for example, in that the amount of fuel recirculated exceeds the amount of fuel delivered, as may arise at the start of a diesel engine or at the transition from full load to idling of the engine. Pulsations of the high-pressure pump are also reproduced correctly. An influence on the performance of the internal combustion engine due to the measurements is excluded because the same conditions are created as in normal operation. This results in very accurate, temporally resolved fuel consumption readings, which correspond to the actual values of the fuel consumption of the internal combustion engine in normal operation outside the measurement times.
    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 other means for adjusting the same fuel mass flows in the two fuel return line. Also, other flowmeters can be used.
    Graz, 2 ^ July 2014 AVL List GmbH
    权利要求:
    Claims (14)
    [1]
    A fuel consumption measuring system comprising a fuel delivery unit (14), via which a first fuel pump (12), via which fuel can be conveyed from a tank (10), is fluidically connectable to a consumer (16), a fuel consumption measuring device (28), which the fuel delivery line (14) is arranged, a first fuel return line (26) which branches off at the consumer (16) and flows between the fuel consumption measuring device (28) and the consumer (16) in the fuel delivery line (14), a second fuel return line (50), which branches off from the fuel delivery line (14) between the first fuel pump (12) and the fuel consumption measuring device (28) and flows to the tank (10), a heat exchanger (52) via which the fuel from the second fuel return line (50) heat from the fuel the first fuel return line (26), characterized in that in the first fuel return line (26) and in the second fuel return line (50) means (54, 56, 62) are arranged, via which an equal volume flow at an orifice (53) of the first fuel return line (26) into the fuel delivery line (14) and adjustable at a branch (58) from the fuel delivery passage (58) into the second fuel return passage (50).
    [2]
    2. fuel consumption measuring system according to claim 1, characterized in that as a means for generating equal volume flows from the fuel delivery line (14) in the second fuel return line (50) and from the first fuel return line (26) in the fuel delivery line (14) each have a flow meter (54, 56) in the second fuel return line (50) and in the first fuel return line (26) is arranged, wherein both flow meters (54, 56) with a flow control unit (60) are electrically connected.
    [3]
    3. fuel consumption measuring system according to claim 2, characterized in that as a means for generating the same volume flows in the fuel return lines (26, 50) in the second fuel return line (50) a control valve (62) is arranged, which via the volume flow control unit (60) is controllable, which is connected to the flow meters (54, 56).
    [4]
    4. fuel consumption measuring system according to one of claims 2 or 3, characterized in that in the first fuel return line (26), a second fuel pump (64) is arranged.
    [5]
    5. fuel consumption measuring system according to claim 4, characterized in that the second fuel pump (64) is electrically connected to a pressure control unit (68) which is electrically connected to a pressure transducer (66) in the first fuel return line (26) upstream of the heat exchanger ( 52) is arranged.
    [6]
    6. Fuel consumption measuring system according to one of the preceding claims, characterized in that in the fuel consumption measuring device (28) a rotary displacer (30) and in a bypass line (34) to the rotary displacer (30) a measuring chamber (38) is formed, in which a piston (40) is arranged, wherein the rotary displacer (30) in dependence of the deflection of the piston (40) is drivable.
    [7]
    7. fuel consumption measuring system according to any one of the preceding claims, characterized in that in the first fuel return line (26) a bypass valve (46) is arranged, via which the fuel from the first fuel return line (26) either to the fuel delivery line (14) or back to the tank ( 10) is feasible.
    [8]
    8. The fuel consumption measuring system according to claim 1, wherein the first flow meter and the second fuel pump are arranged downstream of the heat exchanger in the first fuel return line and the second flow meter and the second flow meter Control valve (62) upstream of the heat exchanger (52) are arranged in the second fuel return line (50).
    [9]
    9. A method for measuring a fuel consumption of an internal combustion engine with a fuel consumption measuring system according to one of the preceding claims, in which via a first fuel pump (12) fuel from a tank (10) to a consumer (16) is conveyed, wherein a fuel consumption measuring device (28) the Volume flow of the delivered fuel measures, characterized in that during the measurement of fuel consumption, the volume flow in a first fuel return line (26), via the fuel from the consumer (16) back to a fuel delivery line (14) between the consumer (16) and the fuel consumption measuring device (28 ) flows and in a second fuel return line (50) via which fuel from the fuel delivery line (14) is conveyed back to the tank (10), is controlled to the same measured values.
    [10]
    10. A method for measuring a fuel consumption of an internal combustion engine according to claim 9, characterized in that the temperature of the fuel in the first fuel return line (26) upstream of the mouth in the fuel delivery line (14) is approximately cooled down to the temperature of the fuel in the tank (10) in that the heated fuel in the first fuel return line (26) and the unheated fuel in the second fuel return line (50) serve as heat exchange media of a heat exchanger (52).
    [11]
    11. A method for measuring a fuel consumption of an internal combustion engine according to any one of claims 9 or 10, characterized in that the pressure of the fuel in the first fuel return line (26) via a pressure transducer (66) is measured and a pressure control unit (68) a second fuel pump (64) is controlled upstream of an orifice (53) of the first fuel return line (26) such that in the first fuel return line (26) a constant pressure aniiegt.
    [12]
    12. A method for measuring a fuel consumption of an internal combustion engine according to any one of claims 9 to 11, characterized in that the volume flow of the fuel in the first fuel return line (26) via a first flow meter (54) is measured and the Voiumenstrom of the fuel in the second fuel return line (50) via a second flow meter (56) is measured, and via a volume flow control unit (60) a control valve (62) in the second fuel return line (50) is controlled such that the volume flow in the second fuel return pipe (50) to an equal value how the volume flow in the first fuel return line (26) is controlled.
    [13]
    13. A method for measuring a fuel consumption of an internal combustion engine according to any one of claims 9 to 12, characterized in that via a bypass valve (46) outside the measuring tents, a fuel flow from the first fuel return line (26), bypassing the heat exchanger (52) into the tank ( 10) and the control valve (62) closes the second fuel return line (50).
    [14]
    14. A method for measuring a fuel consumption of an internal combustion engine according to claim 13, characterized in that during the measuring times, the pressure in the first fuel return line (26) is constantly regulated to a pressure outside the measuring times. Graz, 24- July 2014 AVL List GmbH
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    法律状态:
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    申请号 | 申请日 | 专利标题
    ATA590/2014A|AT515306B1|2014-07-24|2014-07-24|Fuel consumption measuring system and method for measuring a fuel consumption of an internal combustion engine|ATA590/2014A| AT515306B1|2014-07-24|2014-07-24|Fuel consumption measuring system and method for measuring a fuel consumption of an internal combustion engine|
    PCT/EP2015/067040| WO2016012609A1|2014-07-24|2015-07-24|Fuel consumption-measuring system and method for measuring the fuel consumption of an internal combustion engine|
    ES15742242.9T| ES2671412T3|2014-07-24|2015-07-24|Fuel consumption measurement system and procedure for measuring fuel consumption of an internal combustion engine|
    CN201580040247.9A| CN106715882B|2014-07-24|2015-07-24|The method of fuel consumption measuring system and the fuel consumption for measuring internal combustion engine|
    EP15742242.9A| EP3172426B1|2014-07-24|2015-07-24|Fuel consumption measuring system and method for measuring the fuel consumption of an ic engine|
    JP2017504051A| JP6370468B2|2014-07-24|2015-07-24|Fuel consumption measuring system and method for measuring fuel consumption of an internal combustion engine|
    KR1020177003819A| KR101943773B1|2014-07-24|2015-07-24|Fuel consumption-measuring system and method for measuring the fuel consumption of an internal combustion engine|
    US15/328,062| US10094345B2|2014-07-24|2015-07-24|Fuel consumption-measuring system and method for measuring the fuel consumption of an internal combustion engine|
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