Volume-based monitoring system and method for monitoring losses and gains in the transport of fuel in a vehicle tank

Abstract

The present application belongs to fuel transportation technology, and relates to a kind of vehicle-mounted oil tank transportation loss and gain monitoring method and system based on volume characteristics, the steps of method are as follows: according to the longitudinal inclination, lateral inclination and oil original liquid level height of vehicle-mounted oil tank when it is in oil depot after receiving oil and before unloading oil at oil station, and the oil temperature in tank when it is in oil depot and before unloading oil at oil station, combined with oil tank volume characteristic data and the type of oil carried in different working conditions, the volume of oil in tank when it is in oil depot and oil station and the volume correction coefficient of oil at 20 DEG C are calculated respectively;Then the standard volume of oil in tank when it is in oil depot and oil station is obtained, and the transportation loss and gain of oil transport vehicle from oil depot to oil station in transportation process is calculated according to the standard volume of oil in tank when it is in oil depot and the standard volume of oil in tank when it is in oil depot.The present application can accurately obtain transportation loss and gain, with high precision and good applicability.

Description

Technical Field

[0001] This invention belongs to the field of fuel transportation technology, and relates to the technology for monitoring the profit and loss of rail vehicle-mounted oil tank transportation. Specifically, it relates to a system and method for monitoring the profit and loss of rail vehicle-mounted oil tank transportation based on volume characteristics. Background Technology

[0002] The safe transportation of fuel products has always been a major concern in the management of oil transportation companies. Theft and employee misconduct during fuel transportation can cause varying degrees of loss to the company, and ordinary computerized information management systems are no longer sufficient to address this issue. Having a system capable of real-time monitoring of the loads on fuel transport vehicles has become an indispensable auxiliary tool in the management of oil transportation companies.

[0003] The difficulty in monitoring the transportation status of oil tankers in real time has, to some extent, hindered the improvement of business efficiency. When oil is picked up from oil depots and transported to gas stations by tanker trucks, several issues arise: oil receipt losses (the difference between the amount of oil dispensed from the depot and the amount measured in the tank), oil unloading losses (the difference between the amount measured in the tank and the amount unloaded at the gas station), and transportation losses (the difference between the amount of oil received from the depot and the amount unloaded at the gas station). Oil tanks are measured using level gauges installed within them, and the tank volume is only calibrated when the tank is completely horizontal, showing the change in volume with the liquid level. However, tankers cannot guarantee that the tanks are completely horizontal at oil depots and gas stations; the tanks will have longitudinal tilt angles (-7° to 7°) and lateral tilt angles (-7° to 7°). This causes a difference between the liquid level reading from the level gauge and the liquid level when the tank is completely horizontal, making it impossible to accurately measure the true amount of oil in the tank. In the fuel transportation industry, how to dynamically and accurately measure the amount of oil in tanks has been a problem that has plagued the industry for many years.

[0004] Fuel transportation involves three parties: oil depots, transport companies, and gas stations. From the time a tanker truck receives fuel from the depot to its unloading at the gas station, it's typically necessary to monitor the amount of fuel received at the depot and the amount unloaded at the gas station to monitor transportation profits and losses. Excessive error can lead to significant losses for the fuel transporter. Therefore, during fuel tanker truck receiving and unloading, the onboard fuel monitoring system must be able to calculate the received and unloaded fuel volumes based on the real-time temperature of the fuel in the tank, the lateral and longitudinal tilt angles of the tank, and the fuel level. This data must then be converted to a standard volume at 20°C and compared to determine the transportation profit and loss. Currently, there is no good solution for obtaining the standard volume of fuel in the tanker truck in real-time with high accuracy. Existing methods suffer from low accuracy and poor applicability (only applicable within a narrow range of fuel levels), failing to meet the requirements of the fuel transportation industry. Meanwhile, because the dimensions and shape of oil tanks cannot be guaranteed to perfectly match the drawings during the manufacturing process, there is a certain difference between the actual tank volume and the volume of the mathematical model of the tank built according to the drawings. This difference makes it impossible to accurately determine the profit and loss during fuel transportation, which is a challenge faced by fuel transportation managers. Summary of the Invention

[0005] This invention addresses the aforementioned problems in existing technologies, such as the inability to accurately determine transportation gains and losses, by providing a vehicle-mounted oil tanker transportation gain and loss monitoring system and method based on volumetric characteristics. This system can accurately obtain transportation gains and losses with high precision and good applicability.

[0006] To achieve the above objectives, the present invention also provides a method for monitoring the profit and loss of vehicle-mounted oil tank transportation based on volumetric characteristics, the specific steps of which are as follows:

[0007] S 1. Based on the oil tank drawings, a three-dimensional mathematical model of the oil tank is constructed to obtain the oil tank volume data under different working conditions. Nonlinear regression analysis is performed on the oil tank volume data to obtain the oil tank volume characteristic data under different working conditions.

[0008] S2. Based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the vehicle-mounted oil tank when it is in the oil depot, obtained after receiving oil from the oil depot, the volume of oil in the vehicle-mounted oil tank when it is in the oil depot is calculated based on the unit shape function interpolation method and the oil tank volume characteristic data under different working conditions.

[0009] S3. Based on the temperature of the oil inside the tank when the vehicle-mounted oil tank is receiving oil at the oil depot, and based on the calculation model of VCF 15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried by the vehicle-mounted oil tank, calculate the volume correction factor of the oil at 20℃. Multiply the volume of the oil inside the tank obtained in step S2 by the volume correction factor to obtain the standard volume of the oil at 20℃ at the oil depot.

[0010] S4. Based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the tanker before unloading at the gas station, obtained after the tanker arrives at the gas station, the volume of oil in the tanker at the gas station is calculated using the unit shape function interpolation method and the tank volume characteristic data under different working conditions.

[0011] S5. Based on the temperature of the oil in the tank before unloading at the gas station, obtained after the oil truck arrives at the gas station, and using the calculation model and iterative calculation method of VCF 15 at 15℃ in the ISO-91 / 1 international standard, as well as the type of oil carried by the tank, calculate the volume correction factor of the oil at 20℃. Multiply the volume of the oil in the tank obtained in step S4 by the volume correction factor to obtain the standard volume of the oil at 20℃ at the gas station.

[0012] S6. Based on the standard volume obtained in step S3 and step S5, calculate the transportation loss and gain of the oil tanker from the oil depot to the oil station during the transportation process.

[0013] Preferably, the specific method for calculating the volume of fuel in the vehicle-mounted fuel tank when it is in an oil depot or gas station is as follows: The volumes of any four points i, j, m, and n forming a rectangle at the original fuel level are taken from the volumetric characteristic data under different operating conditions, and interpolated to obtain the volume of fuel in the tank.

[0014]

[0015] in,

[0016]

[0017] In the formula, V is the volume of oil in the tank, V i V j V m V n Let i, j, m, and n be the oil volumes at points i, j, m, and n respectively, and let a and b be the side lengths of the rectangle formed by points i, j, m, and n. Let x be the lateral inclination angle and y be the longitudinal inclination angle.

[0018] Preferably, the specific method for calculating the volume correction factor of oil at 20°C in oil depots or oil stations is as follows:

[0019] The calculation model for VCF15 at 15℃ in the ISO-91 / 1 international standard is expressed as follows:

[0020] VCF15=exp[-α 15 ΔT(1+0.8α 15 ΔT)] (3)

[0021] In the formula, VCF15 is the volume correction factor for oil at a standard temperature of 15℃, and α 15ΔT is the coefficient of volumetric expansion of oil at a standard temperature of 15℃, and ΔT is the difference between the current temperature and the standard temperature of 15℃.

[0022] The density ρ of the oil at 20℃ is known. 20 Unit: Kg / m 3 There is an equation:

[0023]

[0024] In the formula, ρ 15 This refers to the density of the oilseed at 15℃, in kg / m³. 3 ;

[0025] From formulas (3) and (4), we get:

[0026]

[0027] Calculate ρ using iterative calculation method 15 ;

[0028] When the temperature of the oil in the tank is t, at temperature t we have:

[0029]

[0030] In the formula, ρ t Let be the density of the oil at temperature t, and VCF20 be the volume correction factor for the oil at 20℃.

[0031] From formula (6):

[0032]

[0033] VCF20 is calculated using formula (7).

[0034] To achieve the above objectives, the present invention provides a vehicle-mounted oil tanker transportation profit and loss monitoring system based on volumetric characteristics, used to implement the aforementioned vehicle-mounted oil tanker transportation profit and loss monitoring method based on volumetric characteristics, comprising:

[0035] The model building module is used to build a three-dimensional mathematical model of the oil tank based on the oil tank drawings.

[0036] The characteristic data acquisition module obtains oil tank volume data under different working conditions based on the three-dimensional mathematical model of the oil tank, performs nonlinear regression analysis on the oil tank volume data, and obtains oil tank volume characteristic data under different working conditions.

[0037] The oil tank data acquisition device is used to acquire the longitudinal tilt angle, lateral tilt angle and original oil level of the vehicle-mounted oil tank when it is in the oil depot after receiving oil; to acquire the oil temperature inside the vehicle-mounted oil tank when receiving oil from the oil depot; and to acquire the longitudinal tilt angle, lateral tilt angle and original oil level of the vehicle-mounted oil tank when it is in the oil station and before unloading oil at the oil station after the oil truck arrives.

[0038] The oil depot volume calculation module calculates the volume of oil in the tank when it is in the oil depot based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the vehicle-mounted oil tank obtained after oil is received from the oil depot, using the unit shape function interpolation method and oil tank volume characteristic data under different working conditions.

[0039] The oil depot volume correction coefficient calculation module calculates the volume correction coefficient of the oil at 20℃ based on the temperature of the oil inside the tank when the vehicle-mounted oil tank receives oil at the oil depot, the calculation model of VCF 15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried by the vehicle-mounted oil tank.

[0040] Oil depot standard volume calculation module: Multiply the oil volume in the tank calculated by the oil depot volume calculation module with the volume correction factor calculated by the oil depot volume correction factor calculation module to obtain the standard volume of oil in the oil depot at 20℃;

[0041] Gas station volume calculation module: Based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the tanker when it is in the oil depot, obtained after the oil truck arrives at the gas station and before unloading, the module calculates the volume of oil in the tanker when it is in the gas station, using the unit shape function interpolation method and tank volume characteristic data under different working conditions.

[0042] The gas station volume correction factor calculation module calculates the volume correction factor of the oil at 20℃ based on the temperature of the oil in the tanker before unloading at the gas station, obtained after the oil truck arrives at the gas station. It is based on the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried by the tanker.

[0043] Gas station standard volume calculation module: Multiply the volume of oil in the tank calculated by the gas station volume calculation module with the volume correction factor calculated by the gas station volume correction factor calculation module to obtain the standard volume of oil at 20℃ at the gas station.

[0044] Profit and loss calculation module: Based on the standard volume calculated by the standard volume calculation module of the oil depot and the standard volume calculation module of the gas station, the transportation profit and loss rate of the oil truck from the oil depot to the gas station during the transportation process is calculated.

[0045] Preferably, the specific method for calculating the volume of oil inside the vehicle-mounted oil tank when it is in an oil depot or when it is in a gas station using the oil depot volume calculation module is as follows: The volume of any four points i, j, m, and n forming a rectangle at the original oil level height is taken from the volume characteristic data under different operating conditions and interpolated to obtain the volume of oil inside the tank.

[0046]

[0047] in,

[0048]

[0049] In the formula, V is the volume of oil in the tank, V i V j V m V n Let i, j, m, and n be the oil volumes at points i, j, m, and n respectively, and let a and b be the side lengths of the rectangle formed by points i, j, m, and n. Let x be the lateral inclination angle and y be the longitudinal inclination angle.

[0050] Preferably, the specific method for the oil depot volume correction factor calculation module to calculate the volume correction factor of oil at 20℃ at the oil depot or the oil station volume correction factor calculation module to calculate the volume correction factor of oil at the oil station is as follows:

[0051] The calculation model for VCF15 at 15℃ in the ISO-91 / 1 international standard is expressed as follows:

[0052] VCF15=exp[-α 15 ΔT(1+0.8α 15 ΔT)] (3)

[0053] In the formula, VCF15 is the volume correction factor for oil at a standard temperature of 15℃, and α 15 ΔT is the coefficient of volumetric expansion of oil at a standard temperature of 15℃, and ΔT is the difference between the current temperature and the standard temperature of 15℃.

[0054] The density ρ of the oil at 20℃ is known. 20 Unit: Kg / m 3 There is an equation:

[0055]

[0056] In the formula, ρ 15 This refers to the density of the oilseed at 15℃, in kg / m³. 3 ;

[0057] From formulas (3) and (4), we get:

[0058]

[0059] Calculate ρ using iterative calculation method 15 ;

[0060] When the temperature of the oil in the tank is t, at temperature t we have:

[0061]

[0062] In the formula, ρ t Let be the density of the oil at temperature t, and VCF20 be the volume correction factor for the oil at 20℃.

[0063] From formula (6):

[0064]

[0065] VCF20 is calculated using formula (7).

[0066] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0067] This invention relates to a system and method for monitoring the profit and loss of vehicle-mounted oil tanker transportation based on volumetric characteristics. It calculates the volume of oil in the tank at the oil depot and the gas station, taking into account the longitudinal and lateral tilt angles, the initial oil level, and the temperature of the oil inside the tank at both locations. This is done in conjunction with tank volumetric characteristic data under different operating conditions and the type of oil being transported. The system also calculates the volume of oil in the tank at the oil depot and the gas station, along with a volume correction factor for the oil at 20°C. This yields the standard volume of oil in the tank at both locations. Based on these standard volumes, the system calculates the transportation profit and loss of the oil truck from the oil depot to the gas station. The system achieves high accuracy in calculating the transportation profit and loss of vehicle-mounted oil tankers, meeting the industry's expected targets: a single transportation profit and loss rate not exceeding 0.09%, and a monthly average transportation profit and loss rate not exceeding 0.05%. This solves the problem of dynamic measurement of transportation profit and loss that has plagued the industry for many years. Attached Figure Description

[0068] Figure 1 This is a flowchart of the method for monitoring the profit and loss of vehicle-mounted oil tank transportation based on volume characteristics, as described in an embodiment of the present invention.

[0069] Figure 2 This is a structural block diagram of the vehicle-mounted oil tanker transportation loss and gain monitoring system based on volume characteristics as described in an embodiment of the present invention;

[0070] Figure 3 This is a schematic diagram of a three-dimensional mathematical model of an oil tank constructed for an embodiment of the present invention;

[0071] Figure 4 These are isochromatic images of volumes at different tilt angles according to embodiments of the present invention.

[0072] In the diagram, 1 is the model building module, 2 is the characteristic data acquisition module, 3 is the oil tank data acquisition device, 4 is the oil depot volume calculation module, 5 is the oil depot volume correction coefficient calculation module, 6 is the oil depot standard volume calculation module, 7 is the gas station volume calculation module, 8 is the gas station volume correction coefficient calculation module, 9 is the gas station standard volume calculation module, and 10 is the profit and loss calculation module. Detailed Implementation

[0073] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0074] When oil tankers receive oil from an oil depot and transport it to a gas station before unloading, it is necessary to measure the amount of oil received from the depot and the amount unloaded at the gas station using measuring instruments to calculate the transportation profit and loss (the difference between the amount of oil received from the depot and the amount unloaded at the gas station). Oil tanks are measured using level gauges installed within them, and the tank volume is only calibrated when the tank is completely horizontal, showing the change in volume with the liquid level. However, oil tankers cannot guarantee that the tanks are completely horizontal when at the oil depot; that is, the tanks will have longitudinal tilt angles (e.g., -7° to 7°) and lateral tilt angles (e.g., -7° to 7°). This causes a difference between the liquid level reading from the level gauge and the liquid level when the tank is completely horizontal, making it impossible to accurately measure the actual amount of oil in the tank. This results in a large error and inaccurate calculation of the oil receiving profit and loss. To accurately detect the transportation profit and loss of onboard oil tankers, this invention provides a method and system for monitoring the transportation profit and loss of onboard oil tankers based on volumetric characteristics. This method and system can accurately obtain the transportation profit and loss with high precision and good applicability. The following is a detailed description in conjunction with the accompanying drawings.

[0075] See Figure 1 This invention provides a method for monitoring the profit and loss of vehicle-mounted oil tank transportation based on volumetric characteristics, the specific steps of which are as follows:

[0076] S1. A three-dimensional mathematical model of the oil tank constructed based on the tank drawings (see...) Figure 3 The oil tank volume data under different operating conditions is obtained, and nonlinear regression analysis is performed on the oil tank volume data to obtain the oil tank volume characteristic data under different operating conditions.

[0077] S2. Based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the vehicle-mounted oil tank when it is in the oil depot, obtained after receiving oil from the oil depot, the volume of oil in the vehicle-mounted oil tank when it is in the oil depot is calculated using the unit shape function interpolation method and the tank volume characteristic data under different working conditions.

[0078] See Figure 4The isochromatic surfaces shown in the diagram represent the volume values ​​at the same liquid level. The liquid level at point P (e.g., 1600 mm) is obtained from a level gauge, and the oil volume at point P is calculated by interpolating the volumes of i, j, m, and n. Based on this principle, the specific method for calculating the oil volume inside the vehicle-mounted oil tank in the oil depot is as follows: From the volumetric characteristic data under different operating conditions, take the volumes of any four points i, j, m, and n forming a rectangle at the original oil level (measured by a level gauge installed inside the oil tank), and interpolate them to obtain the oil volume inside the tank.

[0079]

[0080] in,

[0081]

[0082] In the formula, V is the volume of oil in the tank, V i V j V m V n Let i, j, m, and n be the oil volumes at points i, j, m, and n respectively, and let a and b be the side lengths of the rectangle formed by points i, j, m, and n. Let x be the lateral inclination angle and y be the longitudinal inclination angle.

[0083] S3. Based on the temperature of the oil inside the tank when the vehicle-mounted oil tank is receiving oil at the oil depot (which can be measured by a temperature sensor installed inside the tank), and based on the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried by the vehicle-mounted oil tank, calculate the volume correction factor of the oil at 20℃. Multiply the volume of the oil inside the tank obtained in step S2 by the volume correction factor to obtain the standard volume of the oil at 20℃ in the oil depot.

[0084] Specifically, the method for calculating the volume correction factor of oil at 20℃ is as follows:

[0085] The calculation model for VCF15 at 15℃ in the ISO-91 / 1 international standard is expressed as follows:

[0086] VCF15=exp[-α 15 ΔT(1+0.8α 15 ΔT)] (3)

[0087] In the formula, VCF15 is the volume correction factor for oil at a standard temperature of 15℃, and α 15 ΔT is the coefficient of volumetric expansion of oil at a standard temperature of 15℃, and ΔT is the difference between the current temperature and the standard temperature of 15℃.

[0088] The density ρ of the oil at 20℃ is known. 20 Unit: Kg / m 3 There is an equation:

[0089]

[0090] In the formula, ρ 15 This refers to the density of the oilseed at 15℃, in kg / m³. 3 ;

[0091] From formulas (3) and (4), we get:

[0092]

[0093] Calculate ρ using iterative calculation method 15 The process is as follows: ①ρ 20 =ρ 15 ;②ρ1'5=ρ 20 +0.05; ③ If abs(ρ 15 -ρ1'5)>=0.0001, then using Calculate α 15 Where K0, K1, and A are all constants; ④ρ 15 =ρ1'5, and calculate ρ according to Equation 5. 15 ⑤ Repeat the calculation and compare it with step 3 until the required calculation accuracy is achieved.

[0094] When the temperature of the oil in the tank is t, at temperature t we have:

[0095]

[0096] In the formula, ρ t Let be the density of the oil at temperature t, and VCF20 be the volume correction factor for the oil at 20℃.

[0097] From formula (6):

[0098]

[0099] VCF20 is calculated using formula (7).

[0100] S4. Based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the tanker before unloading at the gas station, obtained after the tanker arrives at the gas station, the volume of oil in the tanker at the gas station is calculated using the unit shape function interpolation method and the tank volume characteristic data under different working conditions.

[0101] See Figure 4The isochromatic surfaces shown in the diagram represent the volume values ​​at the same liquid level. The liquid level at point P (e.g., 1600 mm) is obtained from a level gauge, and the oil volume at point P is calculated by interpolation using the volumes of i, j, m, and n. Based on this principle, the specific method for calculating the oil volume inside the vehicle-mounted fuel tank at the gas station is as follows: From the volumetric characteristic data under different operating conditions, take the volumes of any four points i, j, m, and n forming a rectangle at the original liquid level (measured by a level gauge installed inside the tank), and interpolate them to obtain the oil volume inside the tank.

[0102]

[0103] in,

[0104]

[0105] In the formula, V is the volume of oil in the tank, V i V j V m V n Let i, j, m, and n be the oil volumes at points i, j, m, and n respectively, and let a and b be the side lengths of the rectangle formed by points i, j, m, and n. Let x be the lateral inclination angle and y be the longitudinal inclination angle.

[0106] S5. Based on the temperature of the oil in the tank before unloading at the gas station (which can be measured by a temperature sensor installed in the tank), and using the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried in the tank, calculate the volume correction factor of the oil at 20℃. Multiply the volume of the oil in the tank obtained in step S4 by the volume correction factor to obtain the standard volume of the oil at 20℃ at the gas station.

[0107] Specifically, the method for calculating the volume correction factor of oil at 20℃ is as follows:

[0108] The calculation model for VCF15 at 15℃ in the ISO-91 / 1 international standard is expressed as follows:

[0109] VCF15=exp[-α 15 ΔT(1+0.8α 15 ΔT)] (3)

[0110] In the formula, VCF15 is the volume correction factor for oil at a standard temperature of 15℃, and α 15 ΔT is the coefficient of volumetric expansion of oil at a standard temperature of 15℃, and ΔT is the difference between the current temperature and the standard temperature of 15℃.

[0111] The density ρ of the oil at 20℃ is known. 20 Unit: Kg / m 3There is an equation:

[0112]

[0113] In the formula, ρ 15 This refers to the density of the oilseed at 15℃, in kg / m³. 3 ;

[0114] From formulas (3) and (4), we get:

[0115]

[0116] Calculate ρ using iterative calculation method 15 The process is as follows: ①ρ 20 =ρ 15 ;②ρ1'5=ρ 20 +0.05; ③ If abs(ρ 15 -ρ1'5)>=0.0001, then using Calculate α 15 Where K0, K1, and A are all constants; ④ρ 15 =ρ1'5, and calculate ρ according to Equation 5. 15 ⑤ Repeat the calculation and compare it with step 3 until the required calculation accuracy is achieved.

[0117] When the temperature of the oil in the tank is t, at temperature t we have:

[0118]

[0119] In the formula, ρ t Let be the density of the oil at temperature t, and VCF20 be the volume correction factor for the oil at 20℃.

[0120] From formula (6):

[0121]

[0122] VCF20 is calculated using formula (7).

[0123] S6. Based on the standard volume obtained in step S3 and step S5, calculate the transportation loss and gain of the oil tanker from the oil depot to the oil station during the transportation process.

[0124] The monitoring method of this invention establishes a three-dimensional digital model based on the oil tank drawings, obtains the correspondence between the volume and liquid level of the oil tank at different tilt angles, and then obtains the volumetric characteristic data of the oil tank. Based on the longitudinal tilt angle, lateral tilt angle, and original liquid level of the truck-mounted oil tank at the oil depot after receiving oil and before unloading oil at the oil station, as well as the temperature of the oil inside the tank at the time of receiving oil at the oil depot and before unloading oil at the oil station, and combined with the volumetric characteristic data of the oil tank under different operating conditions and the type of oil carried, the method calculates the volumetric characteristic data based on the element shape function interpolation method and the temperature iteration algorithm. The system calculates the volume of fuel in tanks at oil depots and gas stations, along with a volume correction factor for fuel at 20°C. This allows for the determination of the standard volume of fuel in tanks at both locations. Based on these standard volumes, the system calculates the transportation profit and loss of fuel trucks from oil depots to gas stations. The calculated profit and loss figures for onboard fuel tanker transportation are highly accurate, meeting the industry's expected targets: a single transportation profit and loss rate not exceeding 0.09%, and a monthly average transportation profit and loss rate not exceeding 0.05%. This solves the long-standing problem of dynamic measurement of transportation profit and loss in the industry.

[0125] See Figure 2 This invention provides a vehicle-mounted oil tanker transportation profit and loss monitoring system based on volumetric characteristics, used to implement the vehicle-mounted oil tanker transportation profit and loss monitoring method based on volumetric characteristics described in the above embodiments, including:

[0126] Model building module 1 is used to build a three-dimensional mathematical model of the oil tank based on the oil tank drawings;

[0127] Characteristic data acquisition module 2 acquires oil tank volume data under different working conditions based on the three-dimensional mathematical model of the oil tank, performs nonlinear regression analysis on the oil tank volume data, and obtains oil tank volume characteristic data under different working conditions.

[0128] The oil tank data acquisition device 3 is used to acquire the longitudinal tilt angle, lateral tilt angle and original oil level of the vehicle-mounted oil tank when it is in the oil depot after receiving oil; to acquire the oil temperature inside the vehicle-mounted oil tank when receiving oil from the oil depot; to acquire the longitudinal tilt angle, lateral tilt angle and original oil level of the vehicle-mounted oil tank when it is in the oil depot and before unloading oil at the oil station after the oil truck arrives at the oil station; and to acquire the oil temperature inside the vehicle-mounted oil tank before unloading oil at the oil station.

[0129] The oil depot volume calculation module 4 calculates the volume of oil in the tank when it is in the oil depot based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the vehicle-mounted oil tank when it is in the oil depot, obtained after the oil is received from the oil depot, and the unit shape function interpolation method and the tank volume characteristic data under different working conditions.

[0130] The oil depot volume correction coefficient calculation module 5 calculates the volume correction coefficient of the oil at 20℃ based on the temperature of the oil inside the vehicle-mounted oil tank when it receives oil at the oil depot, the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method, and the type of oil carried by the vehicle-mounted oil tank.

[0131] The standard volume calculation module 6 for oil depots multiplies the volume of oil in the tank calculated by the oil depot volume calculation module with the volume correction factor calculated by the oil depot volume correction factor calculation module to obtain the standard volume of oil in the oil depot at 20℃.

[0132] The gas station volume calculation module 7 calculates the volume of oil in the tank at the gas station based on the longitudinal tilt angle, lateral tilt angle and original oil level height of the tank when the tanker arrives at the gas station and before unloading oil. It is based on the unit shape function interpolation method and the tank volume characteristic data under different working conditions.

[0133] The gas station volume correction factor calculation module 8 calculates the volume correction factor of the oil at 20℃ based on the temperature of the oil in the tank before unloading at the gas station, obtained after the oil truck arrives at the gas station, and the calculation model, iterative calculation method, and type of oil carried by the tank at 15℃ in the ISO-91 / 1 international standard.

[0134] The standard volume calculation module 9 for gas stations multiplies the volume of oil in the tank calculated by the gas station volume calculation module with the volume correction coefficient calculated by the gas station volume correction coefficient calculation module to obtain the standard volume of oil at 20℃ at the gas station.

[0135] The profit and loss calculation module 10 calculates the transportation profit and loss of oil trucks from the oil depot to the oil station during transportation, based on the standard volume calculated by the standard volume calculation module of the oil depot and the standard volume calculation module of the oil station.

[0136] See Figure 4 The isochromatic surfaces shown in the diagram represent the volume values ​​at the same liquid level. The liquid level at point P (e.g., 1600 mm) is obtained from a level gauge. The oil volume at point P is calculated by interpolating the volumes of i, j, m, and n. Based on this principle, specifically, the method for the oil depot volume calculation module to calculate the volume of the vehicle-mounted oil tank when it is in an oil depot, or the method for the gas station volume calculation module to calculate the volume of the vehicle-mounted oil tank when it is in a gas station, is as follows: The volumes of any four points i, j, m, and n forming a rectangle at the original liquid level of the oil tank under different operating conditions are taken from the volume characteristic data and interpolated to obtain the oil volume inside the tank.

[0137]

[0138] in,

[0139]

[0140] In the formula, V is the volume of oil in the tank, V i V j V m V n Let i, j, m, and n be the oil volumes at points i, j, m, and n respectively, and let a and b be the side lengths of the rectangle formed by points i, j, m, and n. Let x be the lateral inclination angle and y be the longitudinal inclination angle.

[0141] Specifically, the method for calculating the volume correction factor of oil at 20℃ in the oil depot or the oil station at the oil station is as follows:

[0142] The calculation model for VCF15 at 15℃ in the ISO-91 / 1 international standard is expressed as follows:

[0143] VCF15=exp[-α 15 ΔT(1+0.8α 15 ΔT)] (3)

[0144] In the formula, VCF15 is the volume correction factor for oil at a standard temperature of 15℃, and α 15 ΔT is the coefficient of volumetric expansion of oil at a standard temperature of 15℃, and ΔT is the difference between the current temperature and the standard temperature of 15℃.

[0145] The density ρ of the oil at 20℃ is known. 20 Unit: Kg / m 3 There is an equation:

[0146]

[0147] In the formula, ρ 15 This refers to the density of the oilseed at 15℃, in kg / m³. 3 ;

[0148] From formulas (3) and (4), we get:

[0149]

[0150] Calculate ρ using iterative calculation method 15 The process is as follows: ①ρ 20 =ρ 15 ;②ρ1'5=ρ 20 +0.05; ③ If abs(ρ 15 -ρ1'5)>=0.0001, then using Calculate α 15 Where K0, K1, and A are all constants; ④ρ 15=ρ1'5, and calculate ρ according to Equation 5. 15 ⑤ Repeat the calculation and compare it with step 3 until the required calculation accuracy is achieved.

[0151] When the temperature of the oil in the tank is t, at temperature t we have:

[0152]

[0153] In the formula, ρ t Let be the density of the oil at temperature t, and VCF20 be the volume correction factor for the oil at 20℃.

[0154] From formula (6):

[0155]

[0156] VCF20 is calculated using formula (7).

[0157] The monitoring system of this invention establishes a three-dimensional digital model based on the oil tank drawings, obtains the correspondence between the volume and liquid level of the oil tank at different tilt angles, and then acquires the volumetric characteristic data of the oil tank. Based on the longitudinal tilt angle, lateral tilt angle, and original liquid level of the truck-mounted oil tank at the oil depot after receiving oil and before unloading oil at the oil station, as well as the temperature of the oil inside the tank at the time of receiving oil at the oil depot and before unloading oil at the oil station, and combined with the volumetric characteristic data of the oil tank under different operating conditions and the type of oil carried, the system calculates the volumetric characteristic data based on the element shape function interpolation method and the temperature iteration algorithm. The system calculates the volume of fuel in tanks at oil depots and gas stations, along with a volume correction factor for fuel at 20°C. This allows for the determination of the standard volume of fuel in tanks at both locations. Based on these standard volumes, the system calculates the transportation profit and loss of fuel trucks from oil depots to gas stations. The calculated profit and loss figures for onboard fuel tanker transportation are highly accurate, meeting the industry's expected targets: a single transportation profit and loss rate not exceeding 0.09%, and a monthly average transportation profit and loss rate not exceeding 0.05%. This solves the long-standing problem of dynamic measurement of transportation profit and loss in the industry.

[0158] The effectiveness of the above monitoring method and system is illustrated below with reference to an embodiment.

[0159] Example: An oil tanker has two compartments, designated as Compartment 1 and Compartment 2. The operational data and transportation profit and loss for both compartments are shown in Table 1. The oil transported by the two compartments during a certain period is shown in column 2 of Table 1; the oil temperature collected by the temperature sensor is shown in columns 4 and 8 of Table 1; and the tilt angle and liquid level height collected by the level gauge are shown in columns 5-7 and 9-11 of Table 1.

[0160] Table 1

[0161]

[0162]

[0163]

[0164]

[0165] The calculation results of transportation profit and loss are shown in the last three columns of Table 1 (Oil Depot V20, Oil Station V20, Profit and Loss Rate). From the transportation profit and loss rate in the last column of Table 1, it can be seen that the transportation profit and loss rate of warehouse 1 is the highest at 0.089%, with a total profit and loss rate of 0.01% for 27 data points; the transportation profit and loss rate of warehouse 2 is the highest at 0.068%, with a total profit and loss rate of 0.01% for 27 data points. The calculation accuracy of the transportation profit and loss rate is high, and the results meet the requirements.

[0166] The above embodiments are used to explain the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A method for monitoring the loss and gain of a vehicle-mounted oil tank based on volume characteristics, characterized by, The specific steps are: S1, based on the oil tank drawing construction of oil tank three-dimensional mathematical model to obtain the oil tank volume data in different working conditions, the oil tank volume data is analyzed by nonlinear regression, the oil tank volume characteristic data in different working conditions is obtained; S2, according to the longitudinal inclination, transverse inclination and original liquid level of the oil tank in the oil depot after receiving oil, based on the unit function interpolation method and the oil tank volume characteristic data in different working conditions, the oil tank volume in the oil depot is calculated; S3, according to the oil temperature in the oil tank in the oil depot after receiving oil, based on the calculation model of VCF15 in ISO-91 / 1 international standard at 15 DEG C, iterative calculation method and the type of oil in the oil tank, the volume correction coefficient of oil at 20 DEG C is calculated, the oil tank volume obtained in step S2 is multiplied by the volume correction coefficient, and the standard volume of oil at 20 DEG C in the oil depot is obtained; S4, according to the longitudinal inclination, transverse inclination and original liquid level of the oil tank in the oil depot before unloading oil after the oil truck arrives at the oil station, based on the unit function interpolation method and the oil tank volume characteristic data in different working conditions, the oil tank volume in the oil depot is calculated; S5, according to the oil temperature in the oil tank in the oil depot before unloading oil after the oil truck arrives at the oil station, based on the calculation model of VCF15 in ISO-91 / 1 international standard at 15 DEG C, iterative calculation method and the type of oil in the oil tank, the volume correction coefficient of oil at 20 DEG C is calculated, the oil tank volume obtained in step S4 is multiplied by the volume correction coefficient, and the standard volume of oil at 20 DEG C in the oil depot is obtained; S6, according to the standard volume obtained in step S3 and the standard volume obtained in step S5, the transportation loss and gain of the oil truck from the oil depot to the oil station in the transportation process is calculated; The specific method for calculating the volume correction coefficient of oil at 20 DEG C is: ISO-91 / 1 international standard at 15°C VCF The calculation model for 15 is represented as: （3） wherein VCF 15 is the volume correction factor of the oil at the standard temperature of 15°C, is the volume expansion factor of the oil at the standard temperature of 15°C, T is the difference between the current temperature and the standard temperature of 15°C. Density of the oil at 20°C in Kg / m 3 with equation: （4） wherein is the density of the oil at 15°C in Kg / m 3 ; From formula (3) and formula (4): （5） The iterative calculation method is used to calculate The process is as follows: ① ; ② ; ③ if abs( ) >= 0.0001, then use to calculate K 0, K 1, A , which are all constants; ④ , and calculate according to formula (5); ⑤ repeat the calculation and compare according to step ③ until the required calculation accuracy is reached;​​​​​ When the oil temperature in the tank is t at a temperature t there is: （6） wherein is the density of the oil at a temperature t of 15 °C, VCF 20 is the volume correction factor of the oil at 20 °C; From formula (6): （7） From equation (7) we obtain VCF 20.

2. The method of claim 1, wherein the method is based on the volume characteristics of the vehicle-mounted oil tank. The specific method for calculating the volume of oil in the tank of the vehicle-mounted oil tank at the oil depot or oil station is: taking the volume of the rectangle formed by any four points of the original liquid level height from the volume characteristic data under different working conditions i 、 j 、 m 、 n to perform interpolation calculation, and the volume of the oil in the tank is: （1） Wherein, （2） wherein V is the volume of oil in the tank, V i , V j , V m , V n are the volumes of oil at the four points, i , j , m , n is the length of the rectangle formed by the four points, a , b is the length of the rectangle formed by the four points, i , j , m , n is the length of the rectangle formed by the four points, x is the lateral tilt angle, y is the longitudinal tilt angle.

3. A tank truck transportation loss and gain monitoring system based on volume characteristics for implementing the tank truck transportation loss and gain monitoring method according to claim 1 or 2, characterized by It includes: The model construction module is used for constructing the oil tank three-dimensional mathematical model based on the oil tank drawing; The characteristic data acquisition module is used for obtaining the oil tank volume data in different working conditions based on the oil tank three-dimensional mathematical model, and the oil tank volume characteristic data in different working conditions is obtained by nonlinear regression analysis on the oil tank volume data; The oil tank data acquisition device is used for obtaining the longitudinal inclination, transverse inclination and original liquid level of the oil tank in the oil depot after receiving oil, obtaining the oil temperature in the oil tank in the oil depot when receiving oil, obtaining the longitudinal inclination, transverse inclination and original liquid level of the oil tank in the oil depot before unloading oil after the oil truck arrives at the oil station, and obtaining the oil temperature in the oil tank in the oil depot before unloading oil; The oil depot volume calculation module is used for calculating the oil tank volume in the oil depot based on the unit function interpolation method and the oil tank volume characteristic data in different working conditions according to the longitudinal inclination, transverse inclination and original liquid level of the oil tank in the oil depot after receiving oil; The oil depot volume correction coefficient calculation module calculates the volume correction coefficient of the oil at 20℃ based on the oil temperature in the tank of the vehicle-mounted oil tank when the oil is received in the oil depot, the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method and the type of the oil carried by the vehicle-mounted oil tank. The oil depot standard volume calculation module multiplies the oil volume in the tank calculated by the oil depot volume calculation module and the volume correction coefficient calculated by the oil depot volume correction coefficient calculation module to obtain the standard volume of the oil at 20℃ when the oil is in the oil depot. The oil station volume calculation module calculates the oil volume in the tank of the vehicle-mounted oil tank when the oil is in the oil station based on the longitudinal inclination, the transverse inclination and the original liquid level of the oil in the tank of the vehicle-mounted oil tank when the oil is in the oil depot, the unit function interpolation method and the oil tank volume characteristic data in different working conditions. The oil station volume correction coefficient calculation module calculates the volume correction coefficient of the oil at 20℃ based on the oil temperature in the tank of the vehicle-mounted oil tank when the oil is in the oil depot, the calculation model of VCF15 at 15℃ in the ISO-91 / 1 international standard, the iterative calculation method and the type of the oil carried by the vehicle-mounted oil tank. The oil station standard volume calculation module multiplies the oil volume in the tank calculated by the oil station volume calculation module and the volume correction coefficient calculated by the oil station volume correction coefficient calculation module to obtain the standard volume of the oil at 20℃ when the oil is in the oil station. The profit and loss calculation module calculates the transportation profit and loss of the oil truck from the oil depot to the oil station in the transportation process based on the standard volume calculated by the oil depot standard volume calculation module and the standard volume calculated by the oil station standard volume calculation module. The specific method for calculating the volume correction coefficient of the oil at 20℃ is as follows: ISO-91 / 1 international standard at 15°C VCF The calculation model for 15 is represented as: （3） wherein VCF 15 is the volume correction factor of the oil at the standard temperature of 15°C, is the volume expansion factor of the oil at the standard temperature of 15°C, T is the difference between the current temperature and the standard temperature of 15°C. Density of the oil at 20°C in Kg / m 3 , with equation: （4） wherein is the density of the oil at 15°C in Kg / m 3 ; According to formula (3) and formula (4), we have: （5） The iterative calculation method is used to calculate , and the process is as follows: ① = ; ② = ; ③ if abs( - ) >= 0.0001, then is used to calculate , wherein K 0, K 1, A are constants; ④ = , and is calculated according to formula (5); ⑤ the calculation is repeated and compared according to the third step until the required calculation precision is reached; When the oil temperature in the tank is t at a temperature t there is: （6） wherein is the density of the oil at a temperature t of 15°C, VCF 20 is the volumetric correction factor of the oil at 20°C; According to formula (6), we have: （7） From equation (7) we obtain VCF 20.

4. The vehicle-mounted oil tank transportation profit and loss monitoring system based on volume characteristics according to claim 3, characterized in that, The specific method for calculating the volume of oil in the tank when the vehicle-mounted oil tank is in the oil depot or the oil station volume calculation module calculates the volume of the vehicle-mounted oil tank in the oil station is as follows: taking the oil original liquid level height to form a rectangle of any four points from the volume characteristic data in different working conditions i 、 j 、 m 、 n Interpolation calculation is performed to obtain the volume of oil in the tank: （1） Wherein, （2） wherein V is the volume of oil in the tank, V i , V j , V m , V n are respectively i , j , m , n the volume of oil at the four points, a , b is i , j , m , n the length of the rectangle formed by the four points, x is the transverse tilt angle, y is the longitudinal tilt angle.

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