Marine ultrasonic oil consumption measuring device

Abstract

The application discloses a marine ultrasonic oil consumption measuring device and belongs to the technical field of oil consumption measurement. The device solves the technical problem that traditional fuel tank oil consumption meters and digital multifunctional oil consumption meters cannot meet the requirements of marine oil consumption measurement. The device comprises an oil inlet flowmeter, an oil return flowmeter, an oil return flowmeter interface CAN wire, an oil inlet flowmeter interface CAN wire and a ship end data acquisition unit. The oil inlet flowmeter is installed on an oil inlet pipe, and the oil return flowmeter is installed on an oil return pipe. The oil inlet flowmeter and the oil return flowmeter have the same structure. The oil inlet flowmeter comprises a first ultrasonic oil consumption sensor, a second ultrasonic oil consumption sensor and a control module. The time difference method is adopted to measure the flow between the first ultrasonic oil consumption sensor and the second ultrasonic oil consumption sensor. At the same time, the flow of the oil inlet pipe is monitored by the oil inlet flowmeter, the flow of the oil return pipe is monitored by the oil return flowmeter, and the flow of the oil inlet pipe and the flow of the oil return pipe are subtracted to obtain the fuel consumption of the marine main engine at the moment.

Description

Technical Field

[0001] This invention relates to the field of fuel consumption measurement technology, and more specifically, to a marine ultrasonic fuel consumption measurement device. Background Technology

[0002] Shipping is a major mode of global bulk cargo trade, playing an irreplaceable role in the transportation industry due to its large transport capacity and low cost. With the increase in shipping volume, soaring fuel prices, and stricter emission regulations, online monitoring and automatic data collection of ship navigation status, energy consumption, and emissions have become particularly important. Intelligent assessment and optimization of ship energy efficiency, navigation, and loading status can continuously improve ship energy efficiency management, thereby reducing ship operating costs.

[0003] For online monitoring and data collection of ship energy consumption, instantaneous fuel consumption measurement is the most crucial step. Currently, there are various fuel consumption measurement instruments, mainly including: fuel tank fuel consumption meters and digital display multi-functional fuel consumption meters. Fuel tank fuel consumption meters use ultrasonic measurement to analyze the fuel level or fuel mass in the tank. Digital display multi-functional fuel consumption meters are intelligent instruments with a microcomputer as their core, equipped with a volumetric fuel consumption sensor, used for fuel consumption testing during ship navigation, engine bench testing, and vehicle road testing. Both of these commonly used fuel consumption measurement methods have significant drawbacks. When a ship is sailing, operations such as wind, waves, beaching, and docking can cause errors in fuel level and fuel mass, leading to inaccurate instantaneous fuel consumption data and a large discrepancy between the calculated fuel consumption and the actual consumption. Digital display multi-functional fuel consumption meters are complex and expensive, and volumetric fuel consumption sensors also suffer from low accuracy in instantaneous fuel consumption data. Furthermore, both are affected by the thermophysical properties of the measured fluid, such as pressure, viscosity, and density, limiting their application scenarios. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a marine ultrasonic fuel consumption measuring device that can accurately monitor and acquire instantaneous fuel consumption data of ships in motion.

[0005] The technical solution of this invention is: a marine ultrasonic fuel consumption measuring device, comprising an inlet flow meter, a return flow meter, a CAN line for the return flow meter interface, a CAN line for the inlet flow meter interface, and a ship-end data acquisition unit. The inlet flow meter is installed on the inlet pipe between the oil tank and the ship's main engine, and the return flow meter is installed on the return pipe between the oil tank and the ship's main engine. The inlet flow meter and the return flow meter have the same structure. The inlet flow meter includes a first ultrasonic fuel consumption sensor and a second ultrasonic fuel consumption sensor arranged at intervals, and a control module electrically connected to the first ultrasonic fuel consumption sensor and the second ultrasonic fuel consumption sensor. The control module of the inlet flow meter is communicatively connected to the ship-end data acquisition unit through the CAN line for the inlet flow meter interface, and the control module of the return flow meter is communicatively connected to the ship-end data acquisition unit through the CAN line for the return flow meter interface.

[0006] The transmitting probe of the first ultrasonic fuel consumption sensor emits ultrasonic waves to a designated location and reflects them to the receiving probe of the second ultrasonic fuel consumption sensor. The transmitting probe of the second ultrasonic fuel consumption sensor emits ultrasonic waves to the designated location and reflects them to the receiving probe of the first ultrasonic fuel consumption sensor. The control module measures the flow rate by using a time difference method between the first and second ultrasonic fuel consumption sensors.

[0007] At the same time, the ship's data acquisition unit monitors the flow rate of the inlet pipe through the inlet flow meter and the flow rate of the return pipe through the return flow meter, and calculates the amount of fuel consumed by the ship's main engine at that moment by taking the difference between the flow rates of the inlet pipe and the return pipe.

[0008] As a further improvement, fuel consumption data is corrected by reducing measurement errors caused by temperature changes and measurement errors related to ultrasonic wave propagation time.

[0009] Furthermore, the measurement errors caused by temperature changes include: acoustic path length L error, pipe diameter error, and acoustic path angle error;

[0010] The error in the acoustic path length L can be reduced by measuring the acoustic path length L when the pipeline is emptied, and by measuring the pipe diameter with a tape measure or caliper.

[0011] By using high-precision measuring instruments to select multiple measuring surfaces as objects, and taking the average value to supplement roundness, the pipe diameter error can be reduced.

[0012] The acoustic path angle is measured using a theodolite to reduce acoustic path angle error.

[0013] Furthermore, by filtering and selecting the ultrasonic signal to obtain a complete ultrasonic signal, and by increasing the frequency of the timing pulse, the measurement error of the ultrasonic propagation time can be reduced.

[0014] Furthermore, a fuel flow rate correction factor is calculated based on the fuel flow state.

[0015] Furthermore, a timing circuit is used to correct the ultrasonic propagation time between the first and second ultrasonic fuel consumption sensors.

[0016] Furthermore, the oil inlet flow meter also includes a display electrically connected to the control module.

[0017] Furthermore, the control module supports 4-20mA analog signal output.

[0018] Furthermore, the ship-side data acquisition unit is equipped with a wireless module that wirelessly transmits data to the ship-to-shore acquisition unit.

[0019] Beneficial effects

[0020] Compared with the prior art, the advantages of this invention are as follows:

[0021] The marine ultrasonic instantaneous fuel consumption measurement device of the present invention can monitor the instantaneous fuel consumption data of ships more stably and accurately, avoiding the influence of parameters such as oil level, fuel quality, pressure, viscosity and density of the measured fluid on the instantaneous fuel consumption data. Moreover, the ship-side fuel consumption acquisition unit can transmit real-time data to the ship-shore acquisition unit through wireless communication, which is of great significance to the fields of ship energy efficiency management and online monitoring of ship fuel consumption data. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the time-difference method ultrasonic flowmeter measurement in this invention;

[0024] Figure 3 This is a schematic diagram of the phase-shift modulation phase-locked loop in this invention.

[0025] Among them: 1-Inlet oil flow meter, 2-Return oil flow meter, 3-Return oil flow meter interface CAN line, 4-Inlet oil flow meter interface CAN line, 5-Ship end data acquisition unit, 6-Electrical box, 7-Oil tank, 8-Main engine of the ship, 9-Inlet oil pipe, 10-Return oil pipe, A-First ultrasonic fuel consumption sensor, B-Second ultrasonic fuel consumption sensor. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0027] See Figure 1 , 2A marine ultrasonic fuel consumption measuring device includes an inlet flow meter 1, a return flow meter 2, a return flow meter interface CAN line 3, an inlet flow meter interface CAN line 4, and a ship-end data acquisition unit 5. The inlet flow meter 1 is installed on the inlet pipe 9 between the oil tank 7 and the ship's main engine 8, and the return flow meter 2 is installed on the return pipe 10 between the oil tank 7 and the ship's main engine 8. The inlet flow meter 1 and the return flow meter 2 have the same structure. The inlet flow meter 1 includes a first ultrasonic fuel consumption sensor A and a second ultrasonic fuel consumption sensor B arranged at intervals, and a control module electrically connected to the first ultrasonic fuel consumption sensor A and the second ultrasonic fuel consumption sensor B. The control module of the inlet flow meter 1 is communicatively connected to the ship-end data acquisition unit 5 through the inlet flow meter interface CAN line 4, and the control module of the return flow meter 2 is communicatively connected to the ship-end data acquisition unit 5 through the return flow meter interface CAN line 3.

[0028] The oil inlet flow meter 1 also includes a housing and a display for electrical connection to the control module. The housing is fitted onto the oil pipe, thereby... Figure 2 The first ultrasonic fuel consumption sensor A and the second ultrasonic fuel consumption sensor B are fixed to the oil pipe. The first ultrasonic fuel consumption sensor A, the second ultrasonic fuel consumption sensor B, the control module, and the display are installed inside the housing. The display is an LCD screen used for on-site readings. The control module also supports 4-20mA analog signal output for current signal acquisition.

[0029] The ship-side data acquisition unit 5 is equipped with a wireless module that wirelessly transmits data to the ship-to-shore acquisition unit. The wireless module is a CAN bus to wireless module. The ship-side data acquisition unit 5 collects flow data from the inlet flow meter 1 and the return flow meter 2 through the CAN line 4 of the inlet flow meter interface and the CAN line 3 of the return flow meter interface, respectively, and parses it to obtain instantaneous fuel consumption data. Then, it can transmit the data to the ship-to-shore acquisition unit through the CAN bus, thus completing the monitoring and collection of instantaneous fuel consumption during the entire ship's navigation.

[0030] Specifically, the transmitting probe of the first ultrasonic fuel consumption sensor A emits ultrasonic waves to a designated location and reflects them to the receiving probe of the second ultrasonic fuel consumption sensor B. The transmitting probe of the second ultrasonic fuel consumption sensor B emits ultrasonic waves to a designated location and reflects them to the receiving probe of the first ultrasonic fuel consumption sensor A. The control module measures the flow rate between the first and second ultrasonic fuel consumption sensors A and B using a time-difference method. Preferably, the designated location is on the midline (symmetry line) between the first and second ultrasonic fuel consumption sensors A and B. The ultrasonic waves emitted by the transmitting probes of the sensors reach the receiving probes after a certain period of time. When the distance between the transmitting and receiving probes is constant and the angle of the emitted ultrasonic waves is constant, the volumetric flow rate of the measured medium is calculated by measuring the time taken for the ultrasonic waves to travel from the transmitting probe to the receiving probe. Figure 2 As shown.

[0031] At the same time, the ship's data acquisition unit 5 monitors the flow rate of the inlet pipe 9 through the inlet flow meter 1 and the flow rate of the return pipe 10 through the return flow meter 2, and calculates the amount of fuel consumed by the ship's main engine at that moment by taking the difference between the flow rate of the inlet pipe 9 and the flow rate of the return pipe 10.

[0032] Preferably, the minimum and maximum data are removed by the data acquisition unit 5 at the ship's end, or the fuel consumption is output after calculating the average of the data at each instant, so as to avoid inaccurate fuel consumption.

[0033] I. Fuel Consumption Data Correction Method

[0034] The formula for calculating fuel flow rate is as follows:

[0035] (1)

[0036] In the formula, Where D is the flow rate and D is the inner diameter of the oil pipe. The length of the acoustic path. The time it takes for the ultrasonic wave to travel from the first ultrasonic fuel consumption sensor A to the second ultrasonic fuel consumption sensor B. The time it takes for the ultrasonic wave to propagate from the second ultrasonic fuel consumption sensor B to the first ultrasonic fuel consumption sensor A. The weighting coefficients of each section can be determined by the Gauss-Jacobi integral;

[0037]

[0038] In the formula, —Relative acoustic path height, mm;

[0039] θ: The angle between the direction of ultrasonic wave propagation and the direction of fuel flow, in degrees; : Tangent sound path angle, °.

[0040] As can be seen from equation (1), when the ultrasonic transducer of the receiving probe and the fuel being measured remain in the same fixed position, the fuel flow calculation result is related to the measurement error of the ultrasonic propagation time and the measurement accuracy of the fuel pipeline.

[0041] Fuel consumption data is corrected by reducing measurement errors caused by temperature changes and measurement errors related to ultrasonic wave propagation time.

[0042] 1. Measurement errors caused by temperature changes include: acoustic path length L error, pipe diameter error, and acoustic path angle error.

[0043] The error in the acoustic path length L can be reduced by measuring the acoustic path length L with the pipeline empty, and by measuring the pipe diameter (outer diameter) using a tape measure or calipers. The pipe diameter is used to calculate the acoustic path length L. The error in the pipe diameter can be reduced by using a high-precision measuring instrument to select multiple measurement surfaces and taking the average value to compensate for roundness. The pipe diameter refers to the inner diameter of the pipe. Finally, the error in the acoustic path angle can be reduced by measuring the acoustic path angle using a theodolite or other angle measuring instruments.

[0044] Ultrasonic flowmeter probes are installed externally on the pipe, directly measuring the flow velocity of the fluid inside. Flow rate is the product of flow velocity and pipe surface area. The pipe area and channel length are either manually input by the user from the main unit or calculated from pipe parameters, or are provided within the flowmeter's built-in pipe parameter range. The accuracy of these parameters directly affects the measurement results. Obtaining pipe parameters is best done through actual measurement. Methods such as consulting design drawings and asking knowledgeable personnel may contain errors, as actual construction conditions often differ from design parameters, manufacturing deviations in the pipe are sometimes significant, and parameters such as pipe wall thickness can change considerably over time.

[0045] When measuring pipe parameters, it is crucial to ensure the methods used are appropriate, and the measuring tools and instruments must be calibrated. When measuring the outer diameter of a pipe, the potential impact of corrosion and dirt on the outer protective layer and surface must be considered. When using an ultrasonic flow meter to measure flow in small-diameter pipes, the error caused by inaccurate input of the inner diameter is particularly significant. For example, if the absolute error of the inner diameter measurement is 1 mm, the relative error will be 0.1% for a DN1000 pipe and 1.0% for a DN100 pipe.

[0046] Flow rate is directly proportional to the square of the inner diameter (the area of ​​the pipe's inner diameter). For example, a 1 mm inner diameter measurement error will result in a flow measurement error of only about 0.3% for a DN1000 pipeline, but about 3% for a DN100 pipeline. Therefore, the larger the pipe diameter of an ultrasonic flow meter, the easier and more accurate the measurement will be; the smaller the pipe diameter, the more difficult it will be to control the measurement.

[0047] Flow rate is directly proportional to the square of the inner diameter (the area of ​​the pipe's inner diameter). For example, a 1 mm inner diameter measurement error will result in a flow measurement error of only about 0.3% for a DN1000 pipeline, but about 3% for a DN100 pipeline. Therefore, the larger the pipe diameter of an ultrasonic flow meter, the easier and more accurate the measurement will be; the smaller the pipe diameter, the more difficult it will be to control the measurement.

[0048] The measurement error of the pipe's cross-sectional area depends on the accuracy of measuring the pipe's inner and outer diameters. The pipe's cross-sectional area is:

[0049] (2)

[0050] In the formula, Indicates area, To represent the diameter, taking the derivative of equation (2), according to the error propagation formula, we have:

[0051] (3)

[0052] Therefore, the measurement error of the pipe cross-sectional area for:

[0053] (4)

[0054] In the formula, The number of bits in the input parameters of the ultrasonic flow meter is constant. Therefore, the measurement error of the pipe cross-sectional area is inversely proportional to the pipe's internal diameter; that is, a smaller pipe inner diameter results in a larger measurement error. The fuel pipeline can be parameterized using a three-dimensional coordinate method, and accurate geometric parameters can be obtained by fitting the data to the cylindrical surface.

[0055] 2. By filtering and selecting ultrasonic signals to obtain complete ultrasonic signals, and by increasing the frequency of timing pulses, the measurement error of ultrasonic propagation time can be reduced.

[0056] Specifically, in ultrasonic flow meters, the ultrasonic signal is the sole source for obtaining the fuel flow velocity inside the pipeline. To obtain accurate propagation time, the integrity of the ultrasonic signal must first be ensured. In actual measurements, impurities inside the fuel, electronic noise from the system, and electromagnetic interference from the installation environment can all affect the ultrasonic signal. Therefore, the ultrasonic signal needs to be screened and filtered to obtain a complete ultrasonic signal.

[0057] The propagation time of an ultrasonic wave is determined by the count value of the system's technical pulses. To improve the accuracy of time measurement, the frequency of the timing pulses can be increased. When the accuracy requirement for time measurement reaches nanoseconds or higher, the frequency of the counting pulses needs to be increased to GHz or higher. At this point, the number of bits in the counter increases significantly, leading to excessively high hardware costs. Therefore, it is necessary to select an appropriate number of bits in the counter based on the actual operating requirements.

[0058] II. Calculation of Flow Correction Coefficient

[0059] 1. Calculate the fuel flow rate correction factor based on the fuel flow state.

[0060] Because the velocity distribution of fuel varies across different sections of the pipeline, the fuel flow velocity needs to be considered when calculating the flow rate. Make corrections.

[0061] (5)

[0062] (6)

[0063] In the formula,

[0064] —Flow rate, m 3 / s;

[0065] —Diameter, in meters;

[0066] —Flow correction factor;

[0067] —Average flow velocity across the cross section, m / s.

[0068] As we know from fluid mechanics, when the Reynolds number... When the temperature is below 2300, the fuel flow is in a laminar state, and the fuel flow velocity is ;

[0069] (7)

[0070] (8)

[0071] In the formula, —Pressure difference between cross sections, kPa;

[0072] r—Inner radius of the fuel line, in meters;

[0073] L—the straight-line installation distance between sensors A and B, in meters (acoustic path length);

[0074] —The flow viscosity of fuel .

[0075] The correction factor at this time is:

[0076] (9)

[0077] when At a velocity >4000, the fuel flow is turbulent, and the fuel cross-section is a logarithmic surface. Experimental curves from a turbulent smooth pipe show the velocity distribution in the turbulent smooth region as follows:

[0078] (10)

[0079] In the formula, , —Distance from the center of the pipeline is The average fuel flow velocity and the maximum fuel flow velocity at the center of the pipeline. .

[0080] Depend on Sure:

[0081] (11)

[0082] (12)

[0083] when When the value is less than 4000, the fuel flow state is in a transitional state, and the correction factor can be calculated using the classical formula:

[0084] (13)

[0085] 2. The ultrasonic propagation time between the first ultrasonic fuel consumption sensor A and the second ultrasonic fuel consumption sensor B is corrected by using a timing circuit.

[0086] Ultrasonic propagation time , The measurement accuracy can be corrected using a timing circuit.

[0087] (14)

[0088] (15)

[0089] In the formula, , —The time difference, in seconds, between ultrasonic transducers A and B receiving the controller signal and transmitting the ultrasonic signal;

[0090] , —The time taken for ultrasonic transducers A and B to receive ultrasonic signals and excite the processing circuit, in seconds;

[0091] , —Other delays of the signal in the two circuits, in seconds.

[0092] The corrected propagation time difference is:

[0093] (16)

[0094] After swapping the positions of the ultrasonic transducers:

[0095] (17)

[0096] As shown in equations (16) and (17), the time difference changes when the position of the ultrasonic transducer changes. This can be achieved by changing the channels of the two circuits. This eliminates other delay errors in the circuit.

[0097] , , , Errors can be reduced using phase-shift keying (PSK) technology. This technology uses hardware circuitry to detect the phase of the ultrasonic signal and employs phase-shift modulation to obtain the ultrasonic synchronization signal. The specific technical process is as follows: Figure 3 As shown.

[0098] The phase detector compares the phase of the ultrasonic signal with that of a standard signal and outputs the phase difference to a filter. The filter filters out interference components in the error voltage, and the filtered signal is coupled to a voltage-controlled oscillator (VCO) to make the output signal frequency close to the standard signal. When the output signal matches the standard signal, the phase-locked loop (PLL) switches to locked mode. When the phase of the received ultrasonic signal changes, the PLL's locked state fails, and the circuit repeats the process.

[0099] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. Marine ultrasonic oil consumption measuring device, characterized in that, The application relates to a fuel consumption monitoring system for a marine diesel engine, which comprises an oil inlet flowmeter (1), an oil return flowmeter (2), an oil return flowmeter interface CAN line (3), an oil inlet flowmeter interface CAN line (4) and a ship end data acquisition unit (5), wherein the oil inlet flowmeter (1) is arranged on an oil inlet pipe (9) between an oil tank (7) and a marine diesel engine (8), the oil return flowmeter (2) is arranged on an oil return pipe (10) between the oil tank (7) and the marine diesel engine (8), the oil inlet flowmeter (1) and the oil return flowmeter (2) are of the same structure, the oil inlet flowmeter (1) comprises a first ultrasonic oil consumption sensor (A), a second ultrasonic oil consumption sensor (B) and a control module electrically connected with the first ultrasonic oil consumption sensor (A) and the second ultrasonic oil consumption sensor (B), the control module of the oil inlet flowmeter (1) is connected with the ship end data acquisition unit (5) through the oil inlet flowmeter interface CAN line (4), and the control module of the oil return flowmeter (2) is connected with the ship end data acquisition unit (5) through the oil return flowmeter interface CAN line (3). The transmitting probe of the first ultrasonic oil consumption sensor (A) transmits ultrasonic waves to a specified position, and the ultrasonic waves are reflected to the receiving probe of the second ultrasonic oil consumption sensor (B); the transmitting probe of the second ultrasonic oil consumption sensor (B) transmits ultrasonic waves to the specified position, and the ultrasonic waves are reflected to the receiving probe of the first ultrasonic oil consumption sensor (A); and the control module measures the flow rate by using the time difference method between the first ultrasonic oil consumption sensor (A) and the second ultrasonic oil consumption sensor (B). At the same time, the ship end data acquisition unit (5) monitors the flow rate of the oil inlet pipe (9) through the oil inlet flowmeter (1), monitors the flow rate of the oil return pipe (10) through the oil return flowmeter (2), and calculates the fuel consumption of the marine diesel engine at the moment by subtracting the flow rate of the oil inlet pipe (9) from the flow rate of the oil return pipe (10). The oil consumption data is corrected by reducing the measurement error caused by temperature change and the measurement error of ultrasonic wave propagation time. The measurement error caused by temperature change includes the sound path length L error, the pipe diameter error and the sound path angle error. The sound path length L error is reduced by measuring the sound path length L in the empty state of the pipe and by measuring the pipe diameter with a tape measure or a caliper. The pipe diameter error is reduced by selecting multiple measurement surfaces as objects through high-precision measuring instruments, taking the average value and supplementing the roundness. The sound path angle error is reduced by measuring the sound path angle through a theodolite. The measurement error of the pipe cross-sectional area depends on the measurement accuracy of the inner and outer diameters of the pipe, and the pipe cross-sectional area is A = pi * D * d / 4. wherein denotes the area, denotes the diameter, and on derivation of the above formula, according to the error propagation formula, we have: Thus, the error in the measurement of the pipe cross-sectional area is: In the formula, The number of bits determined by the input parameters of the ultrasonic flowmeter is a constant; therefore, the measurement error of the pipe cross-sectional area is inversely proportional to the pipe internal diameter, that is, the measurement error is larger when the pipe internal diameter is smaller; the fuel pipe can be parameterized by the three-dimensional coordinate method, and accurate geometric parameters can be obtained by fitting operation according to the cylindrical surface; The ultrasonic wave propagation time between the first ultrasonic oil consumption sensor (A) and the second ultrasonic oil consumption sensor (B) is corrected by adopting a timing circuit method.

2. An ultrasonic oil consumption measuring device for a marine vessel according to claim 1, wherein The measurement error of the ultrasonic wave propagation time is reduced by screening and filtering the ultrasonic wave signal to obtain a complete ultrasonic wave signal and by improving the frequency of the timing pulse.

3. The marine ultrasonic oil consumption measuring device according to claim 1, wherein The fuel flow rate correction coefficient is calculated according to the flow state of the fuel.

4. The marine ultrasonic oil consumption measuring device according to claim 1, wherein The oil inlet flowmeter (1) further comprises a display electrically connected with the control module.

5. The marine ultrasonic oil consumption measuring device according to claim 1, wherein The control module supports 4-20mA analog signal output.

6. The marine ultrasonic oil consumption measuring device according to claim 1, wherein The ship end data acquisition unit (5) is provided with a wireless module for wirelessly transmitting data to the ship-shore acquisition unit.

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