Calibrating device for fuel dispenser

Abstract

The invention discloses a calibrating device for a fuel dispenser. The calibrating device comprises a fuel conveying module, a mass measuring module, a temperature measuring module, a density measuring module and a control module. The fuel oil conveying module is connected with an oil pool and a fuel oil dispenser and conveys fuel oil to the fuel oil dispenser. The mass measurement module, the temperature measurement module and the density measurement module are all connected with the fuel dispenser and receive fuel conveyed by the fuel dispenser; the quality measurement module comprises a quality detection data output end, the temperature measurement module comprises a temperature detection data output end, and the density measurement module comprises a density detection data output end; and the control module comprises a quality detection data receiving end, a temperature detection data receiving end and a density detection data receiving end, and is used for verifying the fuel dispenser according to the temperature data, the quality data, the density data and the fuel volume data. The fuel dispenser calibrating device is simple in structure, high in calibrating accuracy and easy and convenient to operate, and operators can complete calibrating work efficiently and conveniently.

Description

Technical Field

[0001] The present invention relates to the field of metrology technology, and in particular to a fuel dispenser calibration device. Background Technology

[0002] Fuel dispensers are dynamic liquid volume measurement systems used to refuel vehicles. The accuracy of their measurement directly affects the legitimate rights and interests of consumers and businesses, as well as the stability of market order. Therefore, regular calibration of fuel dispensers is an important means to ensure their measurement accuracy.

[0003] The calibration of fuel dispensers is mostly carried out using the volumetric method. The volumetric method determines the metering error of the dispenser by measuring the volume of fuel at a certain temperature and comparing it with the volume displayed on the dispenser.

[0004] However, the volume of fuel changes significantly with temperature, and the volume varies considerably under different ambient temperatures. Therefore, during the calibration process, the volume must be manually converted based on the actual measured fuel temperature, which involves a large amount of calculation and is prone to errors. In addition, traditional volumetric calibration devices are relatively cumbersome to operate, have low calibration efficiency, and require high skill levels from operators, making it difficult to meet the needs of rapid and accurate calibration. Summary of the Invention

[0005] This invention provides a fuel dispenser calibration device that utilizes mass data combined with temperature and density data to improve the accuracy and reliability of fuel dispenser calibration, simplify the operation process, reduce errors caused by human readings, and improve calibration efficiency.

[0006] This invention provides a fuel dispenser calibration device, including a fuel delivery module, a mass measurement module, a temperature measurement module, a density measurement module, and a control module;

[0007] The fuel delivery module is connected to the fuel tank and the fuel dispenser inlet, respectively, and is used to deliver fuel to the fuel dispenser and obtain fuel volume data.

[0008] The mass measurement module, temperature measurement module, and density measurement module are all connected to the fuel outlet of the fuel dispenser to receive the fuel delivered by the fuel dispenser.

[0009] The mass measurement module includes a mass detection data output terminal, the temperature measurement module includes a temperature detection data output terminal, and the density measurement module includes a density detection data output terminal; the control module includes a mass detection data receiving terminal, a temperature detection data receiving terminal, and a density detection data receiving terminal; the mass detection data receiving terminal is electrically connected to the mass detection data output terminal, the temperature detection data receiving terminal is electrically connected to the temperature detection data output terminal, and the density detection data receiving terminal is electrically connected to the density detection data output terminal.

[0010] The control module is used to verify the relative indication error of the fuel dispenser based on the obtained temperature data, mass data, density data, and fuel volume data.

[0011] Optionally, the mass measurement module includes a weighing unit and a weighing container, with the weighing container disposed on the surface of the weighing unit;

[0012] The control module is used to verify the relative indication error according to the following calculation formula:

[0013] ;

[0014] In the above formula, Indicates the relative indication error of the fuel dispenser; Indicates in The volume displayed on the fuel dispenser; This represents the buoyancy correction constant; This indicates the final mass of fuel in the weighing container after refueling is completed; This indicates the initial mass of fuel in the container before refueling; This indicates the density of the fuel in the weighing container; Indicates the coefficient of volumetric expansion of fuel; Indicates the coefficient of volumetric expansion of the weighing container; This indicates the fuel temperature at the inlet of the weighing container. This indicates the temperature of the fuel inside the weighing container.

[0015] Optionally, the mass measurement module also includes a first weighing unit, a second weighing unit, a first weighing container, and a second weighing container; both the first weighing unit and the second weighing unit include a mass detection data output terminal;

[0016] The first weighing unit includes a first range, and the second weighing unit includes a second range, wherein the first range is smaller than the second range.

[0017] The first weighing container includes a first measuring volume, and the second weighing container includes a second measuring volume, wherein the first measuring volume is smaller than the second measuring volume;

[0018] The first weighing container is placed on the surface of the first weighing unit, and the second weighing container is placed on the surface of the second weighing unit.

[0019] Optionally, the temperature measurement module also includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor; the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor all include a temperature detection data output terminal;

[0020] The first temperature sensor is installed on the top of the first weighing container and is used to measure the fuel temperature at the fuel inlet of the first weighing container.

[0021] The second temperature sensor is installed at the bottom of the first weighing container and is used to measure the fuel temperature inside the first weighing container.

[0022] The third temperature sensor is installed on the top of the second weighing container to measure the fuel temperature at the fuel inlet of the second weighing container.

[0023] The fourth temperature sensor is installed at the bottom of the second weighing container to measure the fuel temperature inside the second weighing container.

[0024] Optionally, the density measurement module also includes a first density meter and a second density meter; both the first density meter and the second density meter include a density detection data output terminal;

[0025] The first density meter is installed at the bottom of the first weighing container and is used to measure the density of the fuel in the first weighing container;

[0026] The second density meter is installed at the bottom of the second weighing container and is used to measure the density of the fuel in the second weighing container.

[0027] Optionally, both the first and second weighing containers are provided with an insulation layer on their exterior.

[0028] Optionally, both the first weighing container and the second weighing container are provided with baffles on their tops;

[0029] Both the first and second weighing containers are equipped with drain ports at their bottoms, which are connected to the oil tank.

[0030] Optionally, the fuel delivery module includes a connected inlet pipe and an outlet pipe;

[0031] One end of the oil inlet pipe is immersed in the oil tank, and the other end of the oil outlet pipe is connected to the mass measurement module, density measurement module, and temperature measurement module.

[0032] The fuel delivery module also includes a solenoid valve, which is installed on the fuel outlet pipe; the solenoid valve includes a control signal receiving end, and the control module also includes a control signal output end, which is electrically connected to the control signal receiving end; the control module is also used to control the opening and closing of the solenoid valve.

[0033] Optionally, the control module may also include: a control unit, a temperature acquisition unit, a storage unit, a power supply unit, and a human-machine interaction unit;

[0034] The control unit is electrically connected to the quality detection data receiving end and the density detection data receiving end respectively, and is also electrically connected to the temperature detection data receiving end through the temperature acquisition unit;

[0035] The storage unit is electrically connected to the control unit and is used to receive data written by the control unit or to provide stored information to the control unit.

[0036] The power supply unit is electrically connected to the control unit and is used to supply power to the control unit;

[0037] The human-machine interface unit is electrically connected to the control unit and is used to receive information transmitted by the control unit and display the indication error of the fuel dispenser calibration.

[0038] Optionally, the temperature measurement module includes at least four temperature sensors;

[0039] The control module includes at least four temperature detection data receivers;

[0040] The temperature acquisition unit includes at least four temperature acquisition terminals and at least one extension terminal;

[0041] The temperature sensor, temperature detection data receiver, and temperature acquisition terminal are configured accordingly.

[0042] This invention provides a fuel dispenser calibration device. A fuel delivery module is connected to both the fuel tank and the fuel dispenser inlet to deliver fuel and acquire fuel volume data. A mass measurement module, a temperature measurement module, and a density measurement module are all connected to the fuel dispenser outlet to receive the fuel and perform data measurements. The mass measurement module transmits the measured fuel mass data to the control module's mass detection data receiving terminal through its mass detection data output terminal. The temperature measurement module transmits the measured fuel temperature data to the control module's temperature detection data receiving terminal through its temperature detection data output terminal. The density measurement module transmits the measured fuel density data to the control module's density detection data receiving terminal through its density detection data output terminal. The control module calibrates the fuel dispenser based on the obtained mass, temperature, and density data, as well as the fuel volume data displayed on the fuel dispenser. By measuring the fuel mass and combining the temperature, density, and volume data to calibrate the fuel dispenser, the accuracy and reliability of the calibration are improved. Automated control reduces errors caused by human operation, improves verification efficiency, and the device has a simple structure. The functional modules are reasonably connected through standardized interfaces, which simplifies the operation process and makes it easy for operators to use. It solves the problems of traditional verification devices being cumbersome to operate, having low verification efficiency, and requiring high skills from operators, making it difficult to meet the needs of fast and accurate verification. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of a fuel dispenser calibration device provided in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the quality measurement module structure of a fuel dispenser calibration device provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the control module structure of a fuel dispenser calibration device provided in an embodiment of the present invention;

[0046] Figure 4 This is a flowchart of the operation method of a fuel dispenser calibration device provided in an embodiment of the present invention.

[0047] In this embodiment of the invention, the reference numerals and corresponding feature names are as follows:

[0048] 1-Fuel dispenser, 2-Fuel delivery module, 3-Mass measurement module, 4-Temperature measurement module, 5-Density measurement module, 6-Control module, 7-First weighing unit, 8-Second weighing unit, 9-First weighing container, 10-Second weighing container, 11-Control unit, 12-Temperature acquisition unit, 13-Storage unit, 14-Power supply unit, 15-Human-machine interaction unit. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] This invention provides a fuel dispenser calibration device, which includes a fuel delivery module, a mass measurement module, a temperature measurement module, a density measurement module, and a control module. The fuel delivery module is connected to both the fuel sump and the fuel dispenser inlet, for delivering fuel to the dispenser and acquiring fuel volume data. The mass measurement module, temperature measurement module, and density measurement module are all connected to the fuel dispenser outlet, for receiving the fuel delivered by the dispenser. The mass measurement module includes a mass detection data output terminal, the temperature measurement module includes a temperature detection data output terminal, and the density measurement module includes a density detection data output terminal. The control module includes a mass detection data receiving terminal, a temperature detection data receiving terminal, and a density detection data receiving terminal. The mass detection data receiving terminal is electrically connected to the mass detection data output terminal, the temperature detection data receiving terminal is electrically connected to the temperature detection data output terminal, and the density detection data receiving terminal is electrically connected to the density detection data output terminal. The control module is used to calibrate the relative indication error of the fuel dispenser based on the acquired temperature data, mass data, density data, and fuel volume data.

[0053] Using the above technical solution, the fuel delivery module is connected to both the fuel tank and the fuel dispenser inlet to deliver fuel to the dispenser and acquire fuel volume data. The mass measurement module, temperature measurement module, and density measurement module are all connected to the fuel dispenser outlet to receive the fuel and perform data measurements. The mass measurement module transmits the measured fuel mass data to the control module's mass detection data receiving terminal through its mass detection data output terminal. The temperature measurement module transmits the measured fuel temperature data to the control module's temperature detection data receiving terminal through its temperature detection data output terminal. The density measurement module transmits the measured fuel density data to the control module's density detection data receiving terminal through its density detection data output terminal. The control module calibrates the fuel dispenser based on the obtained mass, temperature, and density data, as well as the fuel volume data displayed on the dispenser. By measuring the fuel mass and combining the temperature, density, and volume data to calibrate the fuel dispenser, the accuracy and reliability of the calibration are improved. Automated control reduces errors caused by human operation, improves verification efficiency, and the device has a simple structure. The functional modules are reasonably connected through standardized interfaces, which simplifies the operation process and makes it easy for operators to use. It solves the problems of traditional verification devices being cumbersome to operate, having low verification efficiency, and requiring high skills from operators, making it difficult to meet the needs of fast and accurate verification.

[0054] The above is the core idea of ​​this application. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0055] Figure 1 This is a schematic diagram of the overall structure of a fuel dispenser calibration device provided in an embodiment of the present invention. This embodiment is applicable to the metrological verification and routine calibration of fuel dispensers. Figure 1 As shown, the fuel dispenser calibration device provided in this embodiment of the invention includes a fuel delivery module 2, a mass measurement module 3, a temperature measurement module 4, a density measurement module 5, and a control module 6. The fuel delivery module 2 is connected to the oil sump and the fuel dispenser inlet, respectively, for delivering fuel to the fuel dispenser 1 and acquiring fuel volume data. The mass measurement module 3, temperature measurement module 4, and density measurement module 5 are all connected to the fuel dispenser 1 outlet, for receiving the fuel delivered by the fuel dispenser 1. The mass measurement module 3 includes a mass detection data output terminal, the temperature measurement module 4 includes a temperature detection data output terminal, and the density measurement module 5 includes a density detection data output terminal. The control module 6 includes a mass detection data receiving terminal, a temperature detection data receiving terminal, and a density detection data receiving terminal. The mass detection data receiving terminal is electrically connected to the mass detection data output terminal, the temperature detection data receiving terminal is electrically connected to the temperature detection data output terminal, and the density detection data receiving terminal is electrically connected to the density detection data output terminal. The control module 6 is used to calibrate the relative indication error of the fuel dispenser based on the obtained temperature data, mass data, density data, and fuel volume data.

[0056] In this embodiment, the fuel delivery module 2 can be understood as a key component of the fuel supply system, used for delivering and recovering fuel for the calibration equipment. The mass measurement module 3 can be understood as an integrated functional module for sensing, collecting, and processing object mass signals, and converting them into readable and analyzable data. The temperature measurement module 4 can be understood as a core component integrating a temperature sensing element, signal processing circuit, and data conversion unit, used for collecting, processing, and outputting temperature information of the target object. The density measurement module 5 can be understood as a functional module that automatically detects the density of a substance by integrating a sensing element, signal processing unit, and data output unit. The control module 6 can be understood as a functional module that automatically monitors, adjusts, and manages the operating status of the target system based on integrated sensing, preset rules, or real-time feedback signals. Relative indication error can be understood as one of the core indicators for measuring the accuracy of a measurement system. It represents the difference between the instrument's indicated value and the actual measured value, and the ratio of this difference to the actual measured value, objectively reflecting the accuracy level of the system at different measurement points.

[0057] Specifically, one end of the fuel delivery module 2 is connected to the fuel tank, and the other end is connected to the fuel dispenser inlet. It delivers fuel from the fuel tank to the fuel dispenser 1. The fuel dispenser 1 measures and records the volume of fuel delivered and transmits the fuel volume data to the control module 6. The mass measurement module 3, temperature measurement module 4, and density measurement module 5 are all connected to the fuel dispenser outlet, receiving the fuel delivered by the fuel dispenser 1 and performing data measurements. The control module 6 includes a mass detection data receiving end, a temperature detection data receiving end, and a density detection data receiving end. The mass measurement module 3 includes a mass detection data output end, transmitting the measured fuel mass data to the mass detection data receiving end through the mass detection data output end. The temperature measurement module 4 includes a temperature detection data output end, transmitting the measured fuel temperature data to the temperature detection data receiving end through the temperature detection data output end. The density measurement module 5 includes a density detection data output end, transmitting the measured fuel density data to the density detection data receiving end through the density detection data output end. The control module 6 calibrates the fuel dispenser 1 based on the obtained temperature data, mass data, density data, and fuel volume data from the fuel dispenser 1.

[0058] For example, during the calibration of the fuel dispenser 1, one end of the fuel delivery module 2 is connected to the fuel tank, and the other end is connected to the fuel inlet of the fuel dispenser 1. After the equipment is started, the fuel delivery module 2 delivers fuel from the fuel tank to the fuel dispenser 1. The fuel dispenser 1 records the volume of fuel delivered this time. For example, the fuel dispenser display shows that the volume of fuel input this time is 50L. Then, the fuel dispenser 1 delivers fuel to the mass measurement module 3, the temperature measurement module 4, and the density measurement module 5 through the fuel outlet. The mass measurement module 3 receives the fuel flowing in from the fuel dispenser 1, measures the fuel mass, and transmits the measured mass data to the mass detection data receiving end of the control module 6 through the mass detection data output terminal. The temperature measurement module 4 simultaneously measures the temperature of the delivered fuel and transmits the measured temperature data to the temperature detection data receiving end of the control module 6 through the temperature detection data output terminal. The density measurement module 5 measures the density of the delivered fuel and transmits the measured density data to the density detection data receiving end of the control module 6 through the density detection data output terminal. The control module 6 receives data and performs calculations based on the acquired mass data, temperature data, density data, and fuel volume data to verify the fuel dispenser 1.

[0059] The fuel dispenser calibration device provided in this embodiment of the invention connects the fuel delivery module 2 to the fuel tank and the fuel dispenser inlet respectively, delivering fuel to the fuel dispenser 1 and acquiring fuel volume data. The mass measurement module 3, temperature measurement module 4, and density measurement module 5 are all connected to the fuel outlet of the fuel dispenser 1, receiving the fuel delivered by the fuel dispenser 1 and performing data measurement. The mass measurement module 3 transmits the measured fuel mass data to the mass detection data receiving end of the control module 6 through the mass detection data output terminal. The temperature measurement module 4 transmits the measured fuel temperature data to the temperature detection data receiving end of the control module 6 through the temperature detection data output terminal. The density measurement module 5 transmits the measured fuel density data to the density detection data receiving end of the control module 6 through the density detection data output terminal. The control module 6 calibrates the relative indication error of the fuel dispenser based on the obtained temperature data, mass data, density data, and fuel volume data displayed by the fuel dispenser. By measuring the quality of fuel and combining temperature, density, and volume data, the fuel dispenser is calibrated, improving the accuracy and reliability of the calibration. Automated control reduces errors caused by human operation, increasing calibration efficiency. The device has a simple structure, and the functional modules are reasonably connected through standardized interfaces, simplifying the operation process and making it convenient for operators to use. It solves the problems of traditional calibration devices being cumbersome to operate, having low calibration efficiency, and requiring high operator skills, making it difficult to meet the needs of fast and accurate calibration.

[0060] Optionally, the mass measurement module 3 includes a weighing unit and a weighing container, with the weighing container disposed on the surface of the weighing unit; the control module 6 is used to verify the relative indication error according to the following calculation formula:

[0061] ;

[0062] In the above formula, This indicates the relative indication error of fuel dispenser 1; Indicates in The volume displayed on the fuel dispenser 1; This represents the buoyancy correction constant; This indicates the final mass of fuel in the weighing container after refueling is completed; This indicates the initial mass of fuel in the container before refueling; This indicates the density of the fuel in the weighing container; Indicates the coefficient of volumetric expansion of fuel; Indicates the coefficient of volumetric expansion of the weighing container; This indicates the fuel temperature at the inlet of the weighing container. This indicates the temperature of the fuel inside the weighing container.

[0063] In this embodiment, the weighing unit can be understood as a device or functional module used to accurately measure the mass or weight of an object and output a quantified result, converting the object's gravity signal into a readable, recordable, or transmittable digital signal. For example, the weighing unit includes, but is not limited to, an electronic scale; this embodiment of the invention does not impose any limitations on this. The weighing container can be understood as a container used to hold the substance to be weighed and, in conjunction with the weighing unit, to achieve accurate measurement of the substance's mass. For example, the weighing container includes, but is not limited to, a weighing bottle.

[0064] Specifically, the weighing container is placed on the surface of the weighing unit to work with the weighing unit to acquire fuel quality data. This represents the buoyancy correction constant, which can be 1.0011. The volumetric expansion coefficient of the fuel can be assigned a value depending on the fuel medium. For example, for gasoline, the value could be... ℃ -1 However, the embodiments of the present invention do not impose any limitations on this. The coefficient of volumetric expansion of the weighing container can be determined based on the material of the container. For example, the value could be... ℃ -1 This embodiment of the invention does not impose any limitations on this. The mass measurement module 3 first weighs the initial mass of the fuel in the container before refueling. The data is transmitted to control module 6, where it is stored. After fuel flows into mass measurement module 3, mass measurement module 3 measures the final mass of fuel in the weighing container. The data is transmitted to control module 6, and simultaneously, the fuel refueling volume is recorded. Temperature measurement module 4 measures the fuel temperature at the inlet of the weighing container. Fuel temperature in the weighing container The fuel density ρ in the weighing container measured by the density measurement module 5 is transmitted to the control module 6. The control module 6 verifies the fuel dispenser 1 based on the received data and the indication error calculation formula.

[0065] For example, during the calibration of fuel dispenser 1, one end of fuel delivery module 2 is connected to the fuel tank, and the other end is connected to the fuel inlet of fuel dispenser 1 to deliver fuel to fuel dispenser 1. Fuel dispenser 1 records the volume of fuel delivered in this operation. The mass measurement module 3 measures the initial mass of fuel in the weighing container before refueling. After refueling, weigh the final mass of the fuel in the container. The quality inspection data is transmitted to the control module 6 via the quality inspection data output terminal, and the temperature measurement module 4 measures the fuel temperature at the inlet of the weighing container. and the temperature of the fuel in the weighing container The temperature detection data output terminal transmits the data to the control module 6. The density measurement module 5 transmits the measured fuel density ρ in the weighing container to the control module 6 via the density detection data output terminal. The control module 6 receives the data and performs calibration calculations on the fuel dispenser according to the preset indication error calculation formula. When the volume of fuel being delivered... The initial mass of fuel in the weighing container before refueling is 50L, with a buoyancy correction constant c of 1.0011. The fuel weight is 2kg. After refueling, weigh the final mass of the fuel in the container. The fuel weighed 36 kg, and the measured density ρ of the fuel in the weighing container was 0.72 g / cm³. 3 The fuel is gasoline, and the coefficient of thermal expansion is... Values ℃ -1 The value of the volume expansion coefficient of the weighing container for ℃ -1 The fuel temperature at the inlet of the weighing container was measured. The temperature of the fuel in the weighing container was 22.1℃. At 22.6℃, the control module 6 calculates the indication error result according to the indication error calculation formula, and the total uncertainty of the fuel dispenser calibration device can reach 0.05%.

[0066] The fuel dispenser calibration device provided in this embodiment of the invention accurately measures fuel quality data by setting up a weighing unit and a weighing container in the quality detection module 3. The control module 6 calculates the indication error of the fuel dispenser calibration device using a preset indication error calculation formula based on the collected mass data, temperature data, density data, and volume data, and performs fuel dispenser calibration based on the numerical error. Through automated data acquisition and calculation, the accuracy and reliability of the calibration are improved, solving the problems of large calculation workload and high error rate caused by manual volume conversion based on fuel temperature during the calibration process, and achieving the effect of reducing errors caused by human readings.

[0067] Optional, Figure 2 This is a schematic diagram of the quality measurement module structure of a fuel dispenser calibration device provided in an embodiment of the present invention. Figure 2 As shown, the mass measurement module 3 also includes a first weighing unit 7, a second weighing unit 8, a first weighing container 9, and a second weighing container 10; both the first weighing unit 7 and the second weighing unit 8 include a mass detection data output terminal; the first weighing unit 7 includes a first range, and the second weighing unit 8 includes a second range, the first range being smaller than the second range; the first weighing container 9 includes a first measuring volume, and the second weighing container 10 includes a second measuring volume, the first measuring volume being smaller than the second measuring volume; the first weighing container 9 is placed on the surface of the first weighing unit 7, and the second weighing container 10 is placed on the surface of the second weighing unit 8.

[0068] In this embodiment, the first weighing unit 7 and the second weighing unit 8 can be understood as two devices or functional modules used to measure the mass or weight of an object and output quantitative results, which can convert the gravity signal of the object into a readable, recordable, or transmittable digital signal. Exemplarily, the first weighing unit 7 and the second weighing unit 8 include, but are not limited to, two electronic scales; this embodiment of the invention does not impose such limitations. The first weighing container 9 and the second weighing container 10 can be understood as two containers used to hold the substance to be weighed and, in conjunction with the weighing units, to achieve accurate measurement of the object's mass. Exemplarily, the first weighing container 9 and the second weighing container 10 include, but are not limited to, weighing bottles. The first range and the second range can be understood as the measurement limits of the first weighing unit 7 and the second weighing unit 8, and the first measurement volume and the second measurement volume can be understood as the volumes of the first weighing container 9 and the second weighing container 10.

[0069] Specifically, the first weighing range is smaller than the second weighing range; for example, the first weighing range could be 60 kg and the second weighing range could be 300 kg. Similarly, the first measuring volume is smaller than the second measuring volume; for example, the first measuring volume could be 60 L and the second measuring volume could be 300 L. Both the first weighing unit 7 and the second weighing unit 8 have leveling adjustment functions, and their accuracy levels are both higher than those specified in national metrological standards. For example, both the first weighing container 9 and the second weighing container 10 have a cylindrical upper half and an inverted conical lower half, and are both made of 304 stainless steel. The first weighing container 9 is placed on the surface of the first weighing unit 7, and the second weighing container 10 is placed on the surface of the second weighing unit 8, to cooperate with the first weighing unit 7 and the second weighing unit 8 to complete the measurement of mass data.

[0070] For example, based on the flow rate of the fuel dispenser's indication error test, fuel is delivered to the mass measurement module 3 via the fuel delivery module 2. The test flow rate is divided at 50 L / min to determine the selected weighing container and weighing unit. If the test flow rate is 0 ≤ L ≤ 50 L / min, the first weighing unit 7 and the first weighing container 9 are selected for mass data measurement; if the test flow rate is 50 L / min < L ≤ 200 L / min, the second weighing unit 8 and the second weighing container 10 are selected for mass data measurement. The first weighing unit 7 or the second weighing unit 8 transmits the measured mass data to the control module 6 through the mass detection data output terminal, facilitating subsequent verification by the control module 6.

[0071] This invention, in its embodiment, sets up a first weighing unit 7 and a second weighing unit 8 with different ranges in the mass measurement module 3, and a first weighing container 9 and a second weighing container 10 with different measuring volumes. Based on the measuring volume of the weighing containers and the range of the weighing units, the first weighing container 9 is placed on the surface of the first weighing unit 7, and the second weighing container 10 is placed on the surface of the second weighing unit 8. Fuel is delivered to the weighing containers, and the mass data is measured by the weighing units and sent to the control module 6 via the mass detection data output terminal. This enables the calibration of fuel dispensers with a flow rate of 5L / min to 200L / min. It offers a wide measurement range and a simple device structure, reducing manufacturing costs. It solves the problems of small calibration range, complex structure, and high cost associated with traditional fuel dispenser calibration devices, achieving wide-range, low-cost, and high-accuracy calibration. Furthermore, the segmented mass measurement method ensures optimal accuracy and performance across different mass ranges, resulting in high measurement precision.

[0072] Optional, for reference Figure 1The temperature measurement module 4 also includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor; each of the first, second, third, and fourth temperature sensors includes a temperature detection data output terminal; the first temperature sensor is installed on the top of the first weighing container and is used to measure the fuel temperature at the fuel inlet of the first weighing container; the second temperature sensor is installed on the bottom of the first weighing container and is used to measure the fuel temperature inside the first weighing container; the third temperature sensor is installed on the top of the second weighing container and is used to measure the fuel temperature at the fuel inlet of the second weighing container; the fourth temperature sensor is installed on the bottom of the second weighing container and is used to measure the fuel temperature inside the second weighing container.

[0073] In this embodiment, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor can be understood as electronic components that can convert the physical quantity of temperature into an electrical signal that can be measured, transmitted, or processed, and can provide basic signals for subsequent temperature monitoring, control, or data analysis.

[0074] Specifically, the first, second, third, and fourth temperature sensors are all model PT100, all use ultra-precision immersion RTD sensors with Class A accuracy; and all have a probe diameter of 2mm, a probe length of 5mm, and use 304 stainless steel sleeves.

[0075] The first, second, third, and fourth temperature sensors all transmit temperature data to the control module 6 via their temperature detection data output terminals. The first temperature sensor is installed on the protrusion of the cylinder at the top of the first weighing container and measures the fuel temperature at the nozzle outlet of the fuel delivery module 2, thus replacing the fuel temperature at the fuel dispenser flow measurement converter. The second temperature sensor is installed at the bottom of the first weighing container, exemplarily 3-5 cm from the bottom, to measure the fuel temperature inside the first weighing container. The third temperature sensor is installed on the protrusion of the cylinder at the top of the second weighing container and measures the fuel temperature at the nozzle outlet of the fuel delivery module 2, thus replacing the fuel temperature at the fuel dispenser flow measurement converter. The fourth temperature sensor is installed at the bottom of the second weighing container, exemplarily 3-5 cm from the bottom, to measure the fuel temperature inside the second weighing container. The temperature measurement range of the first, second, third, and fourth temperature sensors is -25℃ ≤ t ≤ 55℃, and the maximum permissible measurement error is ±0.1℃ for each.

[0076] For example, during the calibration of the fuel dispenser 1, fuel is delivered to the temperature measurement module 4 through the fuel dispenser 1's outlet. Based on the flow rate of the fuel dispenser 1's indication error test, the fuel is delivered to either the first or second weighing container. If the fuel is delivered to the first weighing container, the first temperature sensor collects the fuel temperature at the inlet of the first weighing container and transmits it to the control module 6 via the temperature detection data output terminal. The second temperature sensor collects the fuel temperature inside the first weighing container and transmits it to the control module 6 via the temperature detection data output terminal. If the fuel is delivered to the second weighing container, the third temperature sensor collects the fuel temperature at the inlet of the second weighing container and transmits it to the control module 6 via the temperature detection data output terminal. The fourth temperature sensor collects the fuel temperature inside the second weighing container and transmits it to the control module 6 via the temperature detection data output terminal. The control module 6 then performs subsequent calibration based on the received temperature data.

[0077] This invention employs a high-precision, wide-range temperature measurement module 4 equipped with a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The first temperature sensor is installed on top of the first weighing container to measure the fuel temperature at the inlet. The second temperature sensor is installed at the bottom of the first weighing container to measure the fuel temperature inside. The third temperature sensor is installed on top of the second weighing container to measure the fuel temperature at the inlet. The fourth temperature sensor is installed at the bottom of the second weighing container to measure the fuel temperature inside. By measuring temperature data separately under different ambient temperatures, precise control and high-precision measurement of fuel temperature data are achieved. This solves the measurement error problem caused by the temperature sensitivity of fuel and differences in the weighing environment, ensuring the accuracy and stability of the temperature measurement data.

[0078] Optional, you can continue to refer to Figure 1 The density measurement module 5 also includes a first density meter and a second density meter; both the first density meter and the second density meter include a density detection data output terminal; the first density meter is installed at the bottom of the first weighing container and is used to measure the fuel density in the first weighing container; the second density meter is installed at the bottom of the second weighing container and is used to measure the fuel density in the second weighing container.

[0079] In this embodiment, the first and second densitometers can be understood as two physical measuring instruments used to measure the density of fuel. Specifically, the density measurement range of both the first and second densitometers is 0 ≤ ρ ≤ 1 g / cm³. 3The detected density data is transmitted to the control module 6 via the density detection data output terminal. The first density meter is installed 10cm-15cm from the bottom of the first weighing container to measure the fuel density in the first weighing container; the second density meter is installed 10cm-15cm from the bottom of the second weighing container to measure the fuel density in the second weighing container.

[0080] For example, during the calibration of the fuel dispenser 1, fuel in the fuel tank is delivered to the density measurement module 5 through the fuel dispenser 1's outlet. Depending on the flow rate of the fuel dispenser 1's indication error test, the fuel is delivered to either the first or second weighing container. If the fuel is delivered to the first weighing container, the first densitometer measures the fuel density in the first weighing container and transmits it to the control module 6 via the density detection data output terminal. If the fuel is delivered to the second weighing container, the second densitometer measures the fuel density in the second weighing container and transmits it to the control module 6 via the density detection data output terminal. The control module 6 then performs subsequent calibration based on the received density data.

[0081] This invention, in its embodiment, incorporates a first densitometer and a second densitometer within the density measurement module 6. The first densitometer is installed at the bottom of a first weighing container to measure the fuel density within it, and the density data is transmitted to the control module 6 via a density detection data output terminal. Similarly, the second densitometer is installed at the bottom of a second weighing container to measure the fuel density within it, and the density data is also transmitted to the control module 6 via a density detection data output terminal, thus enabling the acquisition and transmission of density data. This configuration achieves accurate acquisition and real-time transmission of fuel density at different flow rates, providing precise density data for calculating the indication error of the fuel dispenser calibration device, thereby improving the accuracy and reliability of the calibration.

[0082] Optional, you can continue to refer to Figure 1 Both the first and second weighing containers are equipped with an insulation layer on the outside.

[0083] Specifically, the insulation layer includes, but is not limited to, a wrapping layer composed of insulation material; this embodiment of the invention does not impose any limitations on this. By providing an insulation layer outside the first and second weighing containers, stable control of the fuel temperature is achieved, avoiding the impact of sudden temperature fluctuations on the measured fuel density and temperature data, resolving the problem of measurement data deviation caused by temperature differences between the weighing containers, and ensuring the stability of the measurement data.

[0084] Optional, you can continue to refer to Figure 1 Both the first and second weighing containers are equipped with baffles at the top; both the first and second weighing containers are equipped with drain ports at the bottom, which are connected to the oil tank.

[0085] Specifically, both the first and second weighing containers are equipped with baffles at the top to prevent fuel splashing when fuel is introduced into them. A cylindrical protrusion is located above the baffle for inserting the fuel delivery module's nozzle. Both the first and second weighing containers have drain ports at their bottoms, allowing fuel to be transported back to the fuel tank after measurement.

[0086] For example, during the calibration of the fuel dispenser 1, based on the test flow rate, the fuel nozzle of the fuel delivery module 2 is inserted into the cylindrical protrusion above the baffle of the first or second weighing container. At this time, the baffle can block fuel splashing during fuel input. After the mass data, temperature data, and density data have been measured and transmitted to the control module 6, the fuel in the first or second weighing container can be transported back to the fuel tank through the drain port below the first or second weighing container.

[0087] This invention, through the installation of baffles and cylindrical protrusions above the first and second weighing containers, precisely connects with the fuel delivery module 2, ensuring complete fuel entry into the weighing containers while preventing fuel splashing and guaranteeing the stability of data measurement. By providing drain ports at the bottom of the first and second weighing containers, the measured fuel is recycled to an oil sump, achieving fuel recycling and environmental protection. This solves the problems of inaccurate calibration data measurement, fuel waste, and environmental pollution.

[0088] Optional, you can continue to refer to Figure 1 The fuel delivery module 2 includes an inlet pipe and an outlet pipe connected together; one end of the inlet pipe is immersed in the oil sump, and one end of the outlet pipe is connected to the mass measurement module 3, the density measurement module 4, and the temperature measurement module 5; the fuel delivery module 2 also includes a solenoid valve, which is installed on the outlet pipe; the solenoid valve includes a control signal receiving end, and the control module 6 also includes a control signal output end, which is electrically connected to the control signal receiving end; the control module 6 is also used to control the opening and closing of the solenoid valve.

[0089] In this embodiment, the solenoid valve can be understood as an automated actuator that controls the on / off state or flow direction of fluid using the principle of electromagnetic induction. Specifically, one end of the oil inlet pipe is immersed in the oil sump, and the other end is connected to the inlet oil of the fuel dispenser 1 to deliver fuel to the fuel dispenser 1 and record fuel volume data. One end of the oil outlet pipe is connected to the mass measurement module 3, temperature measurement module 4, and density measurement module 5, and the other end is immersed in the oil sump for recovering fuel after measurement. Both the oil inlet and outlet pipes are made of 304 stainless steel, and the nominal diameter (DN) ranges from 25mm to 50mm. The fuel delivery module 2 also includes a solenoid valve, which is installed on the oil outlet pipe. The control module 6 controls the opening and closing of the solenoid valve through control signals for controlling the discharge of fuel from the first and second weighing containers. The nominal diameter (DN) of the solenoid valve can be between 25mm and 50mm, and this embodiment of the invention does not impose any limitation on this.

[0090] For example, during the calibration of fuel dispenser 1, the inlet pipe is connected to the fuel dispenser's inlet. The flow rate for the fuel dispenser's indication error test is confirmed, a suitable weighing container is selected, and the liquid in the selected weighing container is emptied. The solenoid valve is then closed. Fuel is input into fuel dispenser 1 through the inlet pipe, and then flows into the weighing container through the fuel dispenser 1's outlet. Mass data, temperature data, and density data are measured, and the measured data are transmitted to control module 6. After the measurement data is completed, the solenoid valve is opened, and the fuel is discharged from the drain port of the weighing container and recycled to the oil sump through the outlet pipe.

[0091] This invention, through the installation of an inlet pipe, an outlet pipe, and a solenoid valve in the fuel delivery module 2, enables these three components to work together to complete a closed-loop operation of fuel delivery and recycling. Fuel is fed into the fuel dispenser 1 through the inlet pipe, acquiring fuel volume data. Then, it enters the mass measurement module 3, temperature measurement module 4, and density measurement module 5 through the outlet of the fuel dispenser 1, measuring mass, density, and temperature data. Finally, the control module 6 controls the solenoid valve to allow the measured fuel to be recycled back to the fuel sump through the outlet pipe, achieving closed-loop fuel measurement and recycling without the need for additional fuel addition or discharge, thus realizing fuel recycling during the fuel dispenser calibration process. The entire fuel delivery, data measurement, and recycling process is coordinated and automated by the control module 6, solving the problems of fuel waste or asynchronous data acquisition caused by manual operation, and improving the accuracy and efficiency of calibration results.

[0092] Figure 3 This is a schematic diagram of the control module structure of a fuel dispenser calibration device provided in an embodiment of the present invention. Figure 3As shown, the control module 6 also includes: a control unit 11, a temperature acquisition unit 12, a storage unit 13, a power supply unit 14, and a human-machine interaction unit 15; the control unit 11 is electrically connected to the quality detection data receiving end and the density detection data receiving end respectively, and is electrically connected to the temperature detection data receiving end through the temperature acquisition unit 12; the storage unit 13 is electrically connected to the control unit 11 and is used to receive data written by the control unit 11 or to provide stored information to the control unit 11; the power supply unit 14 is electrically connected to the control unit 11 and is used to supply power to the control unit 11; the human-machine interaction unit 15 is electrically connected to the control unit 11 and is used to receive information transmitted by the control unit 11 and display the indication error of the fuel dispenser 1 calibration.

[0093] Specifically, the control unit 11 can be understood as the "decision-making and command core" of the entire control module 6. It can receive external input signals, analyze and calculate the signals according to preset logic or algorithms, and output control commands. For example, the control unit 11 includes, but is not limited to, an MSP430F5435AIPNR microcontroller, a crystal oscillator circuit, a reset circuit, and a Joint Test Action Group (JTAG) program download circuit. The MSP430F5435AIPNR microcontroller may include a 16-bit RISC architecture, with external extended memory, a maximum operating frequency of 25MHz, a random access memory (RAM) capacity of 16KB, and a flash memory capacity of 256KB. This embodiment of the invention does not limit these aspects. The crystal oscillator circuit includes, but is not limited to, a 32.768KHz low-frequency crystal oscillator and an 8MHz high-frequency crystal oscillator; the reset circuit may be an RC circuit composed of a 10kΩ resistor and a 0.1μF capacitor, and includes a reset button for manual reset.

[0094] The temperature acquisition unit 12 can be understood as the core unit for sensing and acquiring temperature information. It can convert temperature into an electrical signal that the control unit 11 can recognize, providing temperature data support for subsequent calculations by the control unit 11. For example, the temperature acquisition unit 12 includes, but is not limited to, an NXI-6510-8 8-channel temperature acquisition card, an ISO3082 magnetically coupled isolation chip, and a MAX485RS485 chip. The temperature acquisition card can communicate with the control unit via an RS485 bus, using the Modbus RTU communication protocol. The resolution of the temperature acquisition card is 0.01℃, and the temperature measurement range is -200℃≤t≤800℃. This embodiment of the invention does not impose any limitations on these aspects.

[0095] Storage unit 13 can be understood as a hardware unit used for temporarily or permanently storing data, program code, configuration parameters, and calculation results required for device operation. Exemplarily, storage unit 13 includes, but is not limited to, an AT45DB161D serial Flash chip, a Micro SD card slot, and a 74HC138 SPI bus arbitration circuit. The AT45DB161D serial Flash chip and the SD card share the Serial Peripheral Interface (SPI) of the control unit 11 via the arbitration circuit. The AT45DB161D serial Flash chip supports buffer writing and Cyclic Redundancy Check (CRC). The AT45DB161D serial Flash chip has a storage capacity of 16 Mbit, uses an SPI communication interface, and requires a power supply voltage range of 2.7V-3.6V; this embodiment of the invention does not impose limitations on this.

[0096] The power supply unit 14 can be understood as a unit that converts externally input electrical energy into standard electrical energy required by various internal units of the device and continuously and stably supplies power. For example, the power supply unit 14 includes, but is not limited to, a DC-DC chip of model MP2359, a linear regulator chip of model AMS1117-3.0, and an LC filter circuit. An external input voltage of 12V / 24V is converted to 5V by the DC-DC chip, and then outputs 3.0V through the AMS1117-3.0 linear regulator chip to power the control unit 11. This embodiment of the invention does not impose limitations on this aspect.

[0097] The human-machine interface unit 15 can be understood as a collection of hardware components and supporting software that realize information transmission and operation control between humans and devices / systems, enabling users to intuitively operate the device and obtain device status feedback. For example, the human-machine interface unit 15 includes, but is not limited to, a 7-inch Liquid Crystal Display (LCD) with model AT070TN92, a resolution of 800P×480P, and supporting capacitive touch, a 74HC245 bus driver chip, and an FT6236 touch chip. The control unit 11 simulates the control signal timing required by the display screen through general purpose input / output pins (GPIO) to control the LCD. Simulated display control signals interact with the FT6236 touch chip via an I2C interface to read touch coordinates; this embodiment of the invention does not limit this aspect.

[0098] For example, fuel flows into the quality detection module 3, temperature measurement module 4, and density measurement module 5 of the calibration device through the fuel dispenser 1's outlet. The detected quality, temperature, and density data are transmitted to the control module 6 through the quality detection data output terminal of the quality measurement module 3, the temperature detection data output terminal of the temperature measurement module 4, and the density detection data output terminal of the density measurement module 5, respectively. The control unit 11 in the control module 6 receives the quality, temperature, and density data, calculates the indication error of the fuel dispenser 1 according to a preset relative indication error calculation formula, and stores the calculation result in the storage module 13. At the same time, the human-machine interaction unit 15 reads the calculation result and displays it on the LCD.

[0099] This invention, through the inclusion of a control unit 11, a temperature acquisition unit 12, a storage unit 13, a power supply unit 14, and a human-machine interface unit 15 in the control module 6, enables the input of measured mass data, temperature data, and density data to the control unit 11 for relative indication error calculation. The calculation results are then displayed via the human-machine interface unit 15, achieving automated calculation and visualization of the indication error of the fuel dispenser calibration device. This solves the problem of difficulty in timely detection of measurement inaccuracies. The temperature acquisition unit 12, connected to the temperature detection data receiver, accurately receives and transmits temperature data, ensuring the accuracy of the measurement data. The coordinated operation of each unit in the control module 6 automates the operation of the fuel dispenser calibration device, simplifying the operation process, reducing the requirements for operators, and improving calibration efficiency.

[0100] Optionally, the temperature measurement module 4 includes at least four temperature sensors; the control module 6 includes at least four temperature detection data receiving terminals; the temperature acquisition unit 12 includes at least four temperature acquisition terminals and at least one extension terminal; the temperature sensors, temperature detection data receiving terminals, and temperature acquisition terminals are configured accordingly.

[0101] Specifically, the four temperature detection data receiving terminals of the control module 6 are electrically connected to the temperature acquisition unit 12, which includes, but is not limited to, having eight temperature acquisition terminals. The first temperature sensor is connected to temperature acquisition terminal 0, the second temperature sensor is connected to temperature acquisition terminal 1, the third temperature sensor is connected to temperature acquisition terminal 2, and the fourth temperature sensor is connected to temperature acquisition terminal 3. At least four temperature acquisition terminals are reserved for expanding the range to ambient temperature.

[0102] For example, when the fuel dispenser 1 is being tested, fuel is delivered to the temperature measurement module 4 through the fuel outlet of the fuel dispenser 1. The temperature measurement module 4 collects temperature data through the temperature sensor. The temperature sensor inputs the collected temperature data through different temperature acquisition terminals of the temperature acquisition unit 12 in the control module 6, and then sends it to the control unit 11 to complete the calculation of relative indication error. The reserved temperature acquisition terminal can be used to collect ambient temperature.

[0103] This invention, through the inclusion of a temperature detection data receiver and a temperature acquisition terminal in the control module 6, enables temperature data transmission between the temperature measurement module 4 and the control module 6, while reserving space for the temperature acquisition terminal to accommodate ambient temperature variations. This achieves stable temperature data transmission and expands the temperature acquisition range, reducing device upgrade costs. The control module 6 can acquire temperature data in real-time and automatically, minimizing manual intervention and improving the device's automation level.

[0104] Figure 4 This is a flowchart illustrating the operation method of a fuel dispenser calibration device provided in an embodiment of the present invention. Figure 4 As shown, taking the measurement of a fuel dispenser flow rate of 40L / min as an example, the specific operation method of the fuel dispenser calibration device includes the following steps:

[0105] S401, The oil inlet pipe is connected to the oil inlet of the fuel dispenser.

[0106] S402. Confirm that the flow rate for the fuel dispenser indication error test is 40L / min, and select the first weighing unit and the first weighing container for the test.

[0107] S403. Drain the liquid from the first weighing container and close the solenoid valve.

[0108] S404. Adjust the first weighing unit to ensure it is horizontal. Record the mass data of the first weighing unit at this time. Send to the control module.

[0109] S405, The fuel delivery module begins delivering fuel.

[0110] S406, The first temperature sensor collects the fuel temperature at the inlet of the first weighing container. And send it to the control module.

[0111] S407. After refueling is completed, the volume of fuel dispensed by the fuel dispenser is... It is sent to the control module.

[0112] S408, The first weighing unit measures the fuel mass at this time. And send it to the control module.

[0113] S409, The third temperature sensor collects the fuel temperature inside the first weighing container. And send it to the control module.

[0114] S410, The first density meter collects the fuel density ρ in the first weighing container and sends it to the control module.

[0115] S411 The control module calculates the relative indication error based on the input fuel volume, mass, temperature, and density data, and records and displays the result.

[0116] S412. After the measurement is completed, the control module controls the solenoid valve to open, and the fuel in the first weighing container is recovered to the oil sump.

[0117] This invention calibrates the fuel dispenser by measuring fuel mass, temperature, and density data and sending them to a control module. The control module combines these data with the fuel volume data to calculate the relative indication error of the fuel dispenser. Automated data acquisition and calculation simplify the operation process and improve the accuracy and reliability of the calibration. The use of high-precision measuring elements and a simple structure ensures accurate measurement data while facilitating parameter setting and result viewing. The device also includes a fuel recovery function, enabling fuel recycling and addressing fuel waste and environmental pollution.

[0118] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A fuel dispenser calibration device, characterized in that, It includes a fuel delivery module, a mass measurement module, a temperature measurement module, a density measurement module, and a control module; The fuel delivery module is connected to the oil tank and the fuel dispenser inlet respectively, and is used to deliver fuel to the fuel dispenser and obtain fuel volume data. The mass measurement module, the temperature measurement module, and the density measurement module are all connected to the fuel outlet of the fuel dispenser and are used to receive the fuel delivered by the fuel dispenser. The mass measurement module includes a mass detection data output terminal, the temperature measurement module includes a temperature detection data output terminal, and the density measurement module includes a density detection data output terminal; the control module includes a mass detection data receiving terminal, a temperature detection data receiving terminal, and a density detection data receiving terminal; the mass detection data receiving terminal is electrically connected to the mass detection data output terminal, the temperature detection data receiving terminal is electrically connected to the temperature detection data output terminal, and the density detection data receiving terminal is electrically connected to the density detection data output terminal. The control module is used to verify the relative indication error of the fuel dispenser based on the obtained temperature data, mass data, density data, and fuel volume data.

2. The fuel dispenser calibration device according to claim 1, characterized in that, The mass measurement module includes a weighing unit and a weighing container, with the weighing container disposed on the surface of the weighing unit; The control module is used to verify the relative indication error according to the following calculation formula: ； In the above formula, Indicates the relative indication error of the fuel dispenser; Indicates in The volume displayed on the fuel dispenser; This represents the buoyancy correction constant; This indicates the final mass of fuel in the weighing container after refueling is completed; This indicates the initial mass of fuel in the weighing container before refueling; This indicates the density of the fuel in the weighing container; Indicates the coefficient of volumetric expansion of fuel; This represents the coefficient of volumetric expansion of the weighing container; This indicates the fuel temperature at the inlet of the weighing container; This indicates the temperature of the fuel inside the weighing container.

3. The fuel dispenser calibration device according to claim 1, characterized in that, The mass measurement module further includes a first weighing unit, a second weighing unit, a first weighing container, and a second weighing container; both the first weighing unit and the second weighing unit include the mass detection data output terminal; The first weighing unit includes a first range, and the second weighing unit includes a second range, wherein the first range is smaller than the second range; The first weighing container includes a first measuring volume, and the second weighing container includes a second measuring volume, wherein the first measuring volume is smaller than the second measuring volume; The first weighing container is placed on the surface of the first weighing unit, and the second weighing container is placed on the surface of the second weighing unit.

4. The fuel dispenser calibration device according to claim 3, characterized in that, The temperature measurement module further includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor; the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor all include the temperature detection data output terminal; The first temperature sensor is installed on the top of the first weighing container and is used to measure the fuel temperature at the fuel inlet of the first weighing container. The second temperature sensor is installed at the bottom of the first weighing container and is used to measure the fuel temperature inside the first weighing container. The third temperature sensor is installed on the top of the second weighing container and is used to measure the fuel temperature at the oil inlet of the second weighing container. The fourth temperature sensor is installed at the bottom of the second weighing container and is used to measure the fuel temperature inside the second weighing container.

5. The fuel dispenser calibration device according to claim 3, characterized in that, The density measurement module further includes a first density meter and a second density meter; both the first density meter and the second density meter include the density detection data output terminal. The first density meter is installed at the bottom of the first weighing container and is used to measure the density of the fuel in the first weighing container; The second densitometer is installed at the bottom of the second weighing container and is used to measure the density of the fuel in the second weighing container.

6. The fuel dispenser calibration device according to claim 3, characterized in that, Both the first weighing container and the second weighing container are provided with an insulation layer on the outside.

7. The fuel dispenser calibration device according to claim 3, characterized in that, Both the first weighing container and the second weighing container are equipped with baffles on their tops; Both the first weighing container and the second weighing container are provided with a drain port at the bottom, and the drain port is connected to the oil tank.

8. The fuel dispenser calibration device according to claim 1, characterized in that, The fuel delivery module includes a connected inlet pipe and an outlet pipe; One end of the oil inlet pipe is immersed in the oil tank, and one end of the oil outlet pipe is connected to the mass measurement module, the density measurement module, and the temperature measurement module. The fuel delivery module further includes a solenoid valve, which is installed on the fuel outlet pipe; the solenoid valve includes a control signal receiving end, and the control module further includes a control signal output end, which is electrically connected to the control signal receiving end; the control module is also used to control the opening and closing of the solenoid valve.

9. The fuel dispenser calibration device according to claim 1, characterized in that, The control module also includes: a control unit, a temperature acquisition unit, a storage unit, a power supply unit, and a human-machine interaction unit; The control unit is electrically connected to the quality detection data receiving end and the density detection data receiving end respectively, and is electrically connected to the temperature detection data receiving end through the temperature acquisition unit; The storage unit is electrically connected to the control unit and is used to receive data written by the control unit or to provide stored information to the control unit. The power supply unit is electrically connected to the control unit and is used to supply power to the control unit; The human-machine interface unit is electrically connected to the control unit and is used to receive information transmitted by the control unit and display the indication error of the fuel dispenser calibration.

10. The fuel dispenser calibration device according to claim 9, characterized in that, The temperature measurement module includes at least four temperature sensors; The control module includes at least four temperature detection data receiving terminals; The temperature acquisition unit includes at least four temperature acquisition terminals and at least one extension terminal; The temperature sensor, the temperature detection data receiving end, and the temperature acquisition end are respectively set up.

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