Traffic determination method and device, equipment, storage medium and product

Abstract

The invention provides a traffic determination method and device, equipment, a storage medium and a product. The flow determination method comprises the following steps: performing loop division on a target loop to obtain a plurality of sub-loops and a connection relationship among the plurality of sub-loops; determining a plurality of groups of loop parameters corresponding to the plurality of sub-loops, and determining a plurality of loop flow resistances according to the plurality of groups of loop parameters; determining the total flow resistance of the target loop according to the plurality of loop flow resistances and the connection relationship; establishing a simplified loop corresponding to the target loop according to the water pump model information corresponding to the water pump in the target loop and the total flow resistance; and an NS equation is established for the simplified loop, and the total loop flow of the target loop is determined according to the NS equation. According to the invention, the speed of determining the flow of the complex pipeline of the waterway can be increased.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management technology, and in particular to a flow determination method, device, equipment, storage medium and product. Background Art

[0002] The vehicle's thermal management system can automatically adjust the cooling intensity to control the corresponding components in the vehicle to operate within the optimal temperature range. Specifically, the function of automatically adjusting the cooling intensity can be achieved by controlling the flow of coolant in the complex water pipes in the vehicle.

[0003] In the related technology, commercial software is used to calculate the flow rate of complex water pipes in the vehicle thermal management loop. Specifically, the complex water pipes are divided into many small volumes by dividing the control volume in the middle, and in each small volume, a group of equations is established according to constraints such as conservation of energy, conservation of mass, conservation of momentum, and conservation of angular momentum to obtain a group of equations corresponding to each small volume, that is, the complete Navier-Stokes equations (NS equations) corresponding to each small volume, and then these equations are discretized into linear equations for solution. When there are a large number of small volumes, the amount of calculation is large when calculating the complete NS equations for each small volume, which reduces the speed of calculating the flow rate of complex water pipes. Summary of the Invention

[0004] Embodiments of the present application provide a flow determination method, apparatus, device, storage medium, and product that can improve the speed of determining the flow in complex water pipelines.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] The present invention provides a method for determining flow rate, the method comprising:

[0007] Performing loop division on the target loop to obtain multiple sub-loops and connection relationships between the multiple sub-loops;

[0008] Determining multiple sets of loop parameters corresponding to the multiple sub-loops, and determining multiple loop flow resistances based on the multiple sets of loop parameters;

[0009] determining a total flow resistance of the target circuit according to the multiple circuit flow resistances and the connection relationship;

[0010] Establishing a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance;

[0011] An NS equation is established for the simplified loop, and the total loop flow of the target loop is determined according to the NS equation.

[0012] In the above solution, the target loop is divided into multiple sub-loops to obtain the connection relationship between the multiple sub-loops, including:

[0013] determining a loop switch for controlling the target loop to form a different loop;

[0014] The target loop is divided according to the loop switch to obtain a plurality of sub-loops and connection relationships between the plurality of sub-loops.

[0015] In the above solution, determining multiple groups of loop parameters corresponding to the multiple sub-loops, and determining multiple loop flow resistances based on the multiple groups of loop parameters, includes:

[0016] determining a plurality of loop flow rates, a plurality of loop pressure drops, and a loop fluid density corresponding to the plurality of sub-loops;

[0017] The plurality of circuit flow resistances are respectively determined according to the plurality of circuit flow rates, the plurality of circuit pressure drops and the circuit fluid density.

[0018] In the above solution, determining the total flow resistance of the target circuit based on the flow resistances of the multiple circuits and the connection relationship includes:

[0019] determining a plurality of valve openings in the plurality of sub-circuits;

[0020] updating the plurality of loop flow resistances respectively according to the plurality of valve openings to obtain a plurality of updated loop flow resistances;

[0021] The multiple updated loop flow resistances are fused according to the flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance.

[0022] In the above solution, the updating of the plurality of loop flow resistances according to the plurality of valve openings to obtain a plurality of updated loop flow resistances includes:

[0023] Obtaining multiple sets of valve parameters in the multiple sub-circuits;

[0024] determining a plurality of valve flow resistances according to the plurality of sets of valve parameters and the plurality of valve openings;

[0025] The updated circuit flow resistances are determined based on the plurality of valve flow resistances and the plurality of circuit flow resistances.

[0026] In the above solution, the connection relationship includes a series relationship and / or a parallel relationship; the flow resistance fusion method corresponding to the connection relationship is used to fuse the multiple updated loop flow resistances to obtain the total flow resistance, including:

[0027] In the case where the connection relationship is a series relationship, determining the sum of the multiple updated loop flow resistances to obtain the total flow resistance;

[0028] In the case where the connection relationship is a parallel relationship, the multiple updated loop flow resistances are merged according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance;

[0029] In a case where the connection relationship includes the series relationship and the parallel relationship, the multiple updated loop flow resistances are fused according to the fusion manner corresponding to the series relationship and the parallel relationship to obtain the total flow resistance.

[0030] In the above solution, the water pump model information includes the corresponding relationship between the flow rate, speed and pressure difference during the operation of the water pump in the target circuit, and the establishment of the NS equation for the simplified circuit includes:

[0031] Establishing the mass conservation equation and momentum conservation equation of the simplified loop;

[0032] Substituting the mass conservation equation and the corresponding relationship into the momentum conservation equation, the NS equation is obtained.

[0033] In the above solution, the method further includes:

[0034] When the speed is the rated speed, a first relationship between the pressure difference and the flow rate is established;

[0035] When the speed is not the rated speed, establishing a second relationship between the pressure difference and the flow rate according to the relationship between the speed and the rated speed and the first relationship;

[0036] Determining a corresponding relationship according to the first relationship and the second relationship;

[0037] The corresponding relationship is determined as the water pump model information.

[0038] In the above solution, after determining the total loop flow of the target loop according to the NS equation, the method further includes:

[0039] According to the total loop flow, the sub-loop flows corresponding to the multiple sub-loops are determined by performing the reverse steps of the flow determination method.

[0040] The present invention provides a flow rate determination device, comprising:

[0041] a dividing unit, configured to divide the target loop into multiple sub-loops and connection relationships between the multiple sub-loops;

[0042] a determination unit, configured to determine multiple sets of loop parameters corresponding to the multiple sub-loops, and determine multiple loop flow resistances based on the multiple sets of loop parameters; determine a total flow resistance of the target loop based on the multiple loop flow resistances and the connection relationship; and determine a total loop flow of the target loop based on the NS equation;

[0043] An establishing unit is used to establish a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance; and establish the NS equation for the simplified circuit.

[0044] In the above solution, the determining unit is used to determine a loop switch that controls the target loop to form a different loop;

[0045] The division unit is configured to perform loop division on the target loop according to the loop switch to obtain a plurality of sub-loops and connection relationships between the plurality of sub-loops.

[0046] In the above scheme, the determination unit is used to determine multiple loop flow rates, multiple loop pressure drops and loop fluid densities corresponding to the multiple sub-loops; and determine the multiple loop flow resistances respectively according to the multiple loop flow rates, the multiple loop pressure drops and the loop fluid density.

[0047] In the above solution, the device further includes an updating unit and a fusion unit;

[0048] The determining unit is configured to determine the openings of multiple valves in the multiple sub-circuits;

[0049] The updating unit is configured to update the plurality of loop flow resistances respectively according to the plurality of valve openings to obtain a plurality of updated loop flow resistances;

[0050] The fusion unit is configured to fuse the multiple updated loop flow resistances according to a flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance.

[0051] In the above solution, the device further includes an acquisition unit;

[0052] The acquisition unit is configured to acquire multiple sets of valve parameters in the multiple sub-circuits;

[0053] The determining unit is configured to determine a plurality of valve flow resistances according to the plurality of valve parameter groups and the plurality of valve openings; and to determine the plurality of updated circuit flow resistances according to the plurality of valve flow resistances and the plurality of circuit flow resistances.

[0054] In the above solution, the connection relationship includes a series relationship and / or a parallel relationship;

[0055] The determining unit is configured to determine the sum of the multiple updated loop flow resistances to obtain the total flow resistance when the connection relationship is a series relationship;

[0056] The fusion unit is used to, when the connection relationship is a parallel relationship, fuse the multiple updated loop flow resistances according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance; when the connection relationship includes the series relationship and the parallel relationship, fuse the multiple updated loop flow resistances according to the fusion method corresponding to the series relationship and the parallel relationship to obtain the total flow resistance.

[0057] In the above solution, the water pump model information includes the corresponding relationship between the flow rate, speed and pressure difference during the operation of the water pump in the target circuit; the device also includes a substitution unit;

[0058] The establishing unit is used to establish the mass conservation equation and momentum conservation equation of the simplified loop;

[0059] The substitution unit is used to substitute the mass conservation equation and the corresponding relationship into the momentum conservation equation to obtain the NS equation.

[0060] In the above solution, the establishing unit is configured to establish a first relationship between the pressure difference and the flow rate when the speed is the rated speed; and to establish a second relationship between the pressure difference and the flow rate based on the relationship between the speed and the rated speed and the first relationship when the speed is not the rated speed.

[0061] The determining unit is configured to determine a corresponding relationship based on the first relationship and the second relationship; and determine the corresponding relationship as the water pump model information.

[0062] In the above solution, the determining unit is configured to determine the sub-loop flows corresponding to the multiple sub-loops according to the total loop flow and in accordance with the reverse execution steps of the flow determination method.

[0063] The present invention provides a method and device for determining flow rate, which includes:

[0064] a memory for storing computer-executable instructions;

[0065] The processor is used to implement the method provided in the embodiment of the present application when executing the computer-executable instructions stored in the memory.

[0066] An embodiment of the present application provides a computer-readable storage medium storing a computer program or computer-executable instructions for implementing the flow determination method provided in the embodiment of the present application when executed by a processor.

[0067] An embodiment of the present application provides a computer program product, including a computer program or computer-executable instructions. When the computer program or computer-executable instructions are executed by a processor, the flow determination method provided in the embodiment of the present application is implemented.

[0068] The embodiments of the present application have the following beneficial effects: the flow determination device divides the target loop into loops to obtain multiple self-loops and the link relationship between multiple sub-loops, and determines multiple loop flow groups corresponding to the multiple self-loops, thereby using the link relationship between the multiple sub-loops to merge the multiple loop flow groups to obtain the total flow resistance of the target loop, and then converts the target loop in the form of a complex water pipeline into a simplified loop that only includes the water pump model information and the total flow resistance corresponding to the water pump in the target loop, and finally obtains the total loop flow of the target loop by establishing and solving the NS equation of the simplified loop, thereby reducing the number of NS equations established when calculating the flow of the complex water pipeline, and only establishing and solving the NS equation of the simplified loop can obtain the total loop flow, thereby reducing the amount of calculation when calculating the total loop flow, that is, reducing the speed when calculating the flow of the complex water pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a flow chart of a flow determination method provided in an embodiment of the present application;

[0070] Figure 2 is an exemplary simplified circuit diagram provided in an embodiment of the present application;

[0071] Figure 3 This is an example flow determination result comparison diagram provided by the embodiment of the present application. Figure 1 ;

[0072] Figure 4 This is an example flow determination result comparison diagram provided by the embodiment of the present application. Figure 2 ;

[0073] Figure 5 This is a schematic diagram of the structure of a flow rate determination device provided in an embodiment of the present application;

[0074] Figure 6 This is a schematic diagram of the composition structure of a flow determination device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solutions and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting this application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0076] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0077] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0078] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0079] The relevant data collection and processing in the embodiments of this application should be strictly in accordance with the requirements of relevant national laws and regulations when applied in examples, and the informed consent or separate consent of the personal information subject should be obtained. Subsequent data use and processing should be carried out within the scope of authorization of laws and regulations and the personal information subject.

[0080] The embodiment of the present application provides a flow determination method, which is applied to a flow determination device. Figure 1 A flow chart of a flow determination method provided in an embodiment of the present application is shown as follows: Figure 1 As shown, the flow determination method may include:

[0081] S101: Divide a target loop into multiple sub-loops and obtain connection relationships between the multiple sub-loops.

[0082] A flow determination method provided in an embodiment of the present application is suitable for determining the flow of complex water pipes in a vehicle thermal management system.

[0083] In the embodiments of the present application, the flow determination device can be implemented in various forms. For example, the flow determination device described in this application may include, for example, a vehicle controller, a vehicle system, a cloud that controls the vehicle, etc. The specific flow determination device can be determined based on actual conditions and is not limited in the embodiments of the present application.

[0084] In the embodiment of the present application, the target circuit can be a complex water pipe in the vehicle thermal management system. The target circuit can also be a circuit in other systems. The specific target circuit can be determined according to actual conditions and is not limited in the embodiment of the present application.

[0085] In the embodiment of the present application, the connection relationship is the connection relationship between multiple sub-circuits. For example, if multiple sub-circuits are parallel circuits, the connection relationship is a parallel relationship; if multiple sub-circuits are series circuits, the connection relationship is a series relationship; if multiple sub-circuits include series circuits and parallel circuits, the connection relationship is a series relationship and a parallel relationship.

[0086] In an embodiment of the present application, the flow determination device divides the target loop into multiple sub-loops and the connection relationship between the multiple sub-loops, including: determining a loop switch that controls the target loop to form different loops; and dividing the target loop according to the loop switch to obtain multiple sub-loops and the connection relationship between the multiple sub-loops.

[0087] In the embodiment of the present application, there can be multiple loop switches, and the specific number of loop switches can be determined according to actual conditions, which is not limited in the embodiment of the present application.

[0088] In an embodiment of the present application, the target circuit includes a circuit switch and a water pump. The different flow directions caused by opening and closing different circuit switches can be defined according to different circuits according to the direction from high pressure to low pressure of the water pump, thereby dividing the target circuit into multiple sub-circuits and determining the connection relationship between the multiple sub-circuits.

[0089] In the embodiment of the present application, the target loop may be divided into loops in other ways to obtain multiple sub-loops and the connection relationships between the multiple sub-loops. The specific implementation method may be determined according to actual conditions and is not limited in the embodiment of the present application.

[0090] S102: Determine multiple groups of loop parameters corresponding to the multiple sub-loops, and determine multiple loop flow resistances based on the multiple groups of loop parameters.

[0091] In an embodiment of the present application, the flow determination device divides the target circuit into multiple sub-circuits, and then determines multiple groups of circuit parameters corresponding to the multiple sub-circuits, and determines multiple circuit flow resistances based on the multiple groups of circuit parameters.

[0092] In the embodiment of the present application, the multiple sub-loops correspond to the multiple loop flow resistances one-to-one, that is, one sub-loop corresponds to one loop flow resistance.

[0093] In an embodiment of the present application, the flow determination device determines multiple sets of loop parameters corresponding to the multiple sub-loops, and determines multiple loop flow resistances based on the multiple sets of loop parameters, including: determining multiple loop flows, multiple loop pressure drops, and loop fluid densities corresponding to the multiple sub-loops; and determining the multiple loop flow resistances respectively based on the multiple loop flows, the multiple loop pressure drops, and the loop fluid densities.

[0094] In the embodiment of the present application, the loop fluid density is the density of the fluid (eg, water) in the complex water pipeline.

[0095] In the embodiment of the present application, the multiple sub-circuits correspond one-to-one with the multiple circuit flows, that is, one sub-circuit corresponds to one circuit flow, and the multiple sub-circuits correspond one-to-one with the multiple circuit pressure drops, that is, one sub-circuit corresponds to one circuit pressure drop.

[0096] In an embodiment of the present application, multiple circuit pressure drops can be measured, and multiple circuit pressure drops can also be obtained by other means. The specific flow determination device determines the multiple circuit pressure drops in a manner that can be determined based on actual conditions, and the embodiment of the present application does not limit this.

[0097] It should be noted that the flow determination device can first determine multiple pressure drop identifiers corresponding to multiple circuit pressure drops and multiple circuit flow rate symbols corresponding to multiple circuit flow rates, thereby determining multiple circuit flow rates and multiple circuit pressure drops corresponding to multiple sub-circuits. Specifically, the multiple circuit flow resistances are expressions of multiple circuit flow resistances. The multiple circuit flow rates are identifiers used to represent circuit flow rates, such as Q.

[0098] In the embodiment of the present application, the formula in formula (1) can be used to determine each of the multiple loop flow resistances according to the multiple loop flow rates, the multiple loop pressure drops, and the loop fluid density:

[0099]

[0100] Wherein, ΔP in formula (1) is any one of the multiple circuit pressure drops, f is the circuit flow resistance of the circuit corresponding to any one of the multiple circuit pressure drops, U is the circuit flow rate of the circuit corresponding to any one of the multiple circuit pressure drops, and ρ is the circuit fluid density.

[0101] S103: Determine the total flow resistance of the target circuit according to the multiple circuit flow resistances and the connection relationship.

[0102] In an embodiment of the present application, after the flow determination device determines multiple sets of loop parameters corresponding to the multiple sub-loops and determines multiple loop flow resistances based on the multiple sets of loop parameters, it can determine the total flow resistance of the target loop based on the multiple loop flow resistances and the connection relationship.

[0103] In an embodiment of the present application, the process of the flow determination device determining the total flow resistance of the target circuit based on the multiple circuit flow resistances and the connection relationship includes: determining the multiple valve openings in the multiple sub-circuits; updating the multiple circuit flow resistances respectively according to the multiple valve openings to obtain multiple updated circuit flow resistances; and fusing the multiple updated circuit flow resistances according to the flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance.

[0104] In an embodiment of the present application, the flow determination device can detect and obtain multiple valve openings, and can also obtain multiple valve openings from other devices, and can also obtain multiple valve openings through other methods. The specific method in which the flow determination device obtains multiple valve openings can be determined according to actual conditions, and the embodiment of the device itself does not limit this.

[0105] In an embodiment of the present application, the flow determination device updates the multiple circuit flow resistances respectively according to the multiple valve openings to obtain multiple updated circuit flow resistances, including: obtaining multiple groups of valve parameters in the multiple sub-circuits; determining multiple valve flow resistances based on the multiple groups of valve parameters and the multiple valve openings; and determining the multiple updated circuit flow resistances based on the multiple valve flow resistances and the multiple circuit flow resistances.

[0106] In the embodiment of the present application, multiple sub-circuits correspond one-to-one to multiple groups of valve parameters, that is, one sub-circuit corresponds to one group of valve parameters.

[0107] In an embodiment of the present application, any one of the multiple sets of valve parameters is the parameter to be identified of the valve in the sub-loop, and the relationship between the valve opening and flow resistance of the valve can be fitted by adjusting any one of the valve parameters.

[0108] In the embodiment of the present application, the method of determining the flow resistance of multiple valves according to the multiple sets of valve parameters and the multiple valve openings is as shown in formula (2):

[0109]

[0110] Among them, f valve is any one of the multiple valve flow resistances, Va is the valve opening of the valve corresponding to any valve flow resistance; k1 and k2 are a set of valve parameters of the valve corresponding to any valve flow resistance.

[0111] In an embodiment of the present application, when multiple valves and multiple sub-circuits are in a series relationship, the sum of the multiple valve flow resistances and the multiple circuit flow resistances is determined separately to obtain multiple updated circuit flow resistances; when multiple valves and multiple sub-circuits are in a parallel relationship, the multiple valve flow resistances and the multiple circuit flow resistances are fused according to the flow resistance fusion method corresponding to the parallel relationship to obtain multiple updated circuit flow resistances.

[0112] In an embodiment of the present application, the connection relationship includes a series relationship and / or a parallel relationship; the flow determination device fuses the multiple updated loop flow resistances according to the flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance, including: when the connection relationship is a series relationship, determining the sum of the multiple updated loop flow resistances to obtain the total flow resistance; when the connection relationship is a parallel relationship, fusing the multiple updated loop flow resistances according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance; when the connection relationship includes the series relationship and the parallel relationship, fusing the multiple updated loop flow resistances according to the fusion methods corresponding to the series relationship and the parallel relationship to obtain the total flow resistance.

[0113] It should be noted that in order to facilitate subsequent calculations, this application adopts two simplified principles: Principle 1: the impact of area change on flow is uniformly calculated into the change in flow resistance, so it is assumed that the area in the pipeline is equal everywhere; Principle 2: the local flow resistance is evenly distributed to the flow resistance along the way.

[0114] In the embodiment of the present application, when multiple sub-circuits are connected in series, the flow rate remains unchanged, so the total flow resistance is the sum of the series flow resistances, and the flow rate is equal. That is, when the connection relationship is a series relationship, the sum of the multiple updated circuit flow resistances is determined to obtain the total flow resistance as shown in formula (3):

[0115]

[0116] It should be noted that f is the total flow resistance, f i is the updated loop flow resistance of the i-th loop.

[0117] In the embodiment of the present application, when multiple sub-circuits are connected in parallel, the pressures at both ends of different branches are equal, and the total flow rate is the sum of the flow rates of each sub-circuit. That is, when the connection relationship is a parallel relationship, the multiple updated circuit flow resistances are fused according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance as shown in formula (4):

[0118]

[0119] It should be noted that f is the total flow resistance, fi is the updated loop flow resistance of the i-th loop.

[0120] S104: Establish a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance.

[0121] In an embodiment of the present application, after the flow determination device determines the total flow resistance of the target circuit based on the multiple circuit flow resistances and the connection relationship, it can establish a corresponding simplified circuit of the target circuit based on the water pump model information corresponding to the water pump in the target circuit and the total flow resistance.

[0122] In an embodiment of the present application, the flow determination device maps the total flow resistance into a flow resistance device that affects the target circuit, and the circuit obtained by connecting the water pump and the flow resistance device in series is the simplified circuit corresponding to the target circuit, that is, based on the water pump model information and the total flow resistance, the simplified circuit of the target circuit is obtained.

[0123] For example, Figure 2 As shown, the circuit obtained by connecting the water pump and the flow resistance device with the flow resistance value of the total flow resistance in series is a simplified circuit. In this simplified circuit, the water flows from bottom to top, and the pressure regulating box is used to control the pressure at the water pump source to remain unchanged at p0.

[0124] S105 , establishing a NS equation for the simplified loop, and determining the total loop flow of the target loop according to the NS equation.

[0125] In an embodiment of the present application, the flow determination device establishes a corresponding simplified loop of the target loop based on the water pump model information corresponding to the water pump in the target loop and the total flow resistance. Then, the flow determination device can establish an NS equation for the simplified loop and determine the total loop flow of the target loop based on the NS equation.

[0126] In the embodiment of the present application, the total loop flow of the target loop can be obtained by solving the NS equation.

[0127] In an embodiment of the present application, the water pump model information includes the correspondence between the flow rate, speed and pressure difference during the operation of the water pump in the target circuit. The process of the flow determination device establishing the NS equation for the simplified circuit includes: establishing the mass conservation equation and the momentum conservation equation for the simplified circuit; substituting the mass conservation equation and the correspondence into the momentum conservation equation to obtain the NS equation.

[0128] In an embodiment of the present application, the flow determination device substitutes the mass conservation equation and the corresponding relationship into the momentum conservation equation to obtain the NS equation, and the process includes: simplifying the mass conservation equation according to the incompressible fluid to obtain a simplified result; substituting the simplified result and the corresponding relationship into the momentum conservation equation to obtain the NS equation.

[0129] In an embodiment of the present application, the flow determination device can establish a first relationship between the pressure difference and the flow when the speed is the rated speed; when the speed is not the rated speed, establish a second relationship between the pressure difference and the flow based on the relationship between the speed and the rated speed and the first relationship; determine a corresponding relationship based on the first relationship and the second relationship; and determine the corresponding relationship as the water pump model information.

[0130] In the embodiment of the present application, a water pump model is established based on the relationship between the water pump pressure difference, flow rate, and speed. In the known relationship, when the pressure difference remains unchanged, the flow rate and the speed are proportional, and when the flow rate remains unchanged, the pressure difference and the square of the speed are proportional.

[0131] First, the relationship between the pressure difference and flow rate at rated speed is established as shown in formulas (5)-(6):

[0132] P e =P e,0 -k3Q e (5)

[0133]

[0134] It should be noted that P e is the pressure difference at rated speed, Q e is the flow rate at rated speed, Q e，0 is the flow rate when the pressure difference is 0, P e,0 is the pressure difference when the flow rate is 0, k3 is the parameter to be identified, which is related to the structure of the water pump.

[0135] After that, the pressure difference-flow relationship under different speeds is established, and the speed-flow-pressure difference relationship is shown in formulas (7)-(8):

[0136]

[0137] It should be noted that n is the speed, n e is the rated speed, so the undetermined slope k at the speed n can be obtained as shown in formula (9):

[0138]

[0139] Finally, the flow rate when the speed is n can be determined as shown in formula (10):

[0140] P n =P n,0 -k n Q n (10)

[0141] In the embodiment of the present application, in order to simplify the calculation, the fluid is regarded as an incompressible fluid, and the mass conservation equation can be used to establish formula (11):

[0142]

[0143] Since it is an incompressible fluid, the second term on the left side of the formula is 0 (i.e. The value of is 0), so the differential of the flow rate Q with respect to the position x is 0, and the flow rate is the same everywhere in the circuit.

[0144] In the embodiment of the present application, according to the momentum conservation equation, formula (12) can be established:

[0145]

[0146] In formula (12), s is the circumference of the pipeline. Since it is an incompressible fluid, the two terms on the left side of the formula are 0. By shifting the terms and dividing by A (the cross-sectional area of ​​the pipeline), the result is shown in formula (13):

[0147]

[0148] Integrating both sides of the equal sign in formula (13) with respect to x yields formula (14):

[0149]

[0150] When x=0, the pressure is P T +P n , is the pump pressure from PT. When x = L (loop length), the pressure is PT. Substituting these two conditions into formula (14), we get formulas (15)-(16):

[0151] P0=C(t)=P n,0 -k n Q n +P T (15)

[0152]

[0153] Combining formulas (15) and (16), eliminating PT, and integrating with respect to t, we can obtain formula (17):

[0154]

[0155] in,

[0156] The flow rate at the previous moment.

[0157] In an embodiment of the present application, after the flow determination device determines the total loop flow of the target loop according to the NS equation, it can also determine the sub-loop flows corresponding to the multiple sub-loops according to the total loop flow and the reverse execution steps of the flow determination method.

[0158] It can be understood that by executing the steps of the flow determination method in reverse, the sub-circuit flow corresponding to multiple sub-circuits is determined according to the total circuit flow resistance, so that the flow determination method in this application can not only determine the total circuit flow of the target circuit, but also determine the sub-circuit flow corresponding to different sub-circuits in the target circuit, thereby improving the reliability of determining the flow of the target circuit.

[0159] In the embodiment of the present application, the comparison result of the flow rate (simulation data) of the target circuit determined by the flow rate determination method of the present application and the flow rate (test data) in the target circuit obtained by the test is as follows: Figure 3 and Figure 4 As shown, the simulation data is close to the test data, so the accuracy of the flow rate determined by the flow determination device can be determined. Figure 3 The target loop and Figure 4 The target circuit in is different.

[0160] It can be understood that the flow determination device divides the target loop into loops to obtain multiple self-loops and the link relationship between multiple sub-loops, and determines multiple loop flow groups corresponding to the multiple self-loops, so as to fuse the multiple loop flow groups using the link relationship between the multiple sub-loops to obtain the total flow resistance of the target loop. Thereafter, the target loop in the form of a complex water pipeline is converted into a simplified loop that only includes the water pump model information and the total flow resistance corresponding to the water pump in the target loop. By establishing and solving the NS equation of the simplified loop, the total loop flow of the target loop is finally obtained, which reduces the number of NS equations established when calculating the flow of the complex water pipeline. The total loop flow can be obtained by only establishing and solving the NS equation of the simplified loop, thereby reducing the amount of calculation when calculating the total loop flow, that is, reducing the speed when calculating the flow of the complex water pipeline.

[0161] Based on the same inventive concept as the above-mentioned flow determination method, an embodiment of the present application provides a flow determination device 1, corresponding to a flow determination method; Figure 5 This is a schematic diagram of the structure of a flow determination device provided in an embodiment of the present application. The flow determination device 1 may include:

[0162] A division unit 11 is configured to divide the target loop into multiple sub-loops and connection relationships between the multiple sub-loops;

[0163] a determination unit 12, configured to determine multiple sets of loop parameters corresponding to the multiple sub-loops, and determine multiple loop flow resistances based on the multiple sets of loop parameters; determine a total flow resistance of the target loop based on the multiple loop flow resistances and the connection relationship; and determine a total loop flow of the target loop based on the NS equation;

[0164] The establishing unit 13 is configured to establish a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance; and establish the NS equation for the simplified circuit.

[0165] In some embodiments of the present application, the determining unit 12 is configured to determine a loop switch that controls the target loop to form a different loop;

[0166] The division unit 11 is configured to divide the target loop into multiple sub-loops and the connection relationships between the multiple sub-loops according to the loop switches.

[0167] In some embodiments of the present application, the determination unit 12 is used to determine multiple loop flow rates, multiple loop pressure drops and loop fluid densities corresponding to the multiple sub-loops; and determine the multiple loop flow resistances respectively based on the multiple loop flow rates, the multiple loop pressure drops and the loop fluid density.

[0168] In some embodiments of the present application, the apparatus further includes an updating unit and a fusion unit;

[0169] The determining unit 12 is configured to determine the openings of multiple valves in the multiple sub-circuits;

[0170] The updating unit is configured to update the plurality of loop flow resistances respectively according to the plurality of valve openings to obtain a plurality of updated loop flow resistances;

[0171] The fusion unit is configured to fuse the multiple updated loop flow resistances according to a flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance.

[0172] In some embodiments of the present application, the apparatus further includes an acquisition unit;

[0173] The acquisition unit is configured to acquire multiple sets of valve parameters in the multiple sub-circuits;

[0174] The determining unit 12 is configured to determine a plurality of valve flow resistances according to the plurality of valve parameter groups and the plurality of valve openings; and to determine the plurality of updated circuit flow resistances according to the plurality of valve flow resistances and the plurality of circuit flow resistances.

[0175] In some embodiments of the present application, the connection relationship includes a series relationship and / or a parallel relationship;

[0176] The determining unit 12 is configured to determine the sum of the multiple updated loop flow resistances to obtain the total flow resistance when the connection relationship is a series relationship;

[0177] The fusion unit is used to, when the connection relationship is a parallel relationship, fuse the multiple updated loop flow resistances according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance; when the connection relationship includes the series relationship and the parallel relationship, fuse the multiple updated loop flow resistances according to the fusion method corresponding to the series relationship and the parallel relationship to obtain the total flow resistance.

[0178] In some embodiments of the present application, the water pump model information includes a correspondence between flow rate, speed, and pressure difference during operation of the water pump in the target circuit; the device further includes a substitution unit;

[0179] The establishing unit 13 is used to establish the mass conservation equation and momentum conservation equation of the simplified loop;

[0180] The substitution unit is used to substitute the mass conservation equation and the corresponding relationship into the momentum conservation equation to obtain the NS equation.

[0181] In some embodiments of the present application, the establishing unit 13 is configured to establish a first relationship between the pressure difference and the flow rate when the speed is the rated speed; and to establish a second relationship between the pressure difference and the flow rate based on the relationship between the speed and the rated speed and the first relationship when the speed is not the rated speed.

[0182] The determining unit 12 is configured to determine a corresponding relationship based on the first relationship and the second relationship; and determine the corresponding relationship as the water pump model information.

[0183] In some embodiments of the present application, the determining unit 12 is configured to determine the sub-loop flows corresponding to the multiple sub-loops according to the total loop flow and inversely execute steps of the flow determination method.

[0184] It should be noted that, in actual applications, the above-mentioned division unit 11, determination unit 12 and establishment unit 13 can be implemented by a processor 14 on the flow determination device, specifically a CPU (Central Processing Unit), MPU (Microprocessor Unit), DSP (Digital Signal Processing) or Field Programmable Gate Array (FPGA); the above-mentioned data storage can be implemented by a memory 15 on the flow determination device.

[0185] The present application also provides a flow determination device, such as Figure 6 As shown, the flow determination device includes: a processor 14, a memory 15 and a communication bus 16. The memory 15 communicates with the processor 14 through the communication bus 16. The memory 15 stores a program executable by the processor 14. When the program is executed, the flow determination method described above is executed by the processor 14.

[0186] In practical applications, the memory 15 may be a volatile memory, such as a random-access memory (RAM); or a non-volatile memory, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); or a combination of the above types of memory, and provide instructions and data to the processor 14.

[0187] Embodiments of the present application provide a computer program product, comprising a computer program or computer-executable instructions stored in a computer-readable storage medium. A processor of a flow determination device reads the computer-executable instructions from the computer-readable storage medium and executes the computer-executable instructions, causing the flow determination device to perform the flow determination method described above in the embodiments of the present application.

[0188] The embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, the processor will execute the flow determination method provided by the embodiment of the present application, for example, Figure 1 The flow rate determination method is shown.

[0189] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; or various devices including one or any combination of the above memories.

[0190] In some embodiments, computer-executable instructions may be in the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0191] As an example, computer-executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as, for example, in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinating files (e.g., files storing one or more modules, subroutines, or code portions).

[0192] It can be understood that the flow determination device divides the target loop into loops to obtain multiple self-loops and the link relationship between multiple sub-loops, and determines multiple loop flow groups corresponding to the multiple self-loops, so as to fuse the multiple loop flow groups using the link relationship between the multiple sub-loops to obtain the total flow resistance of the target loop. Thereafter, the target loop in the form of a complex water pipeline is converted into a simplified loop that only includes the water pump model information and the total flow resistance corresponding to the water pump in the target loop. By establishing and solving the NS equation of the simplified loop, the total loop flow of the target loop is finally obtained, which reduces the number of NS equations established when calculating the flow of the complex water pipeline. The total loop flow can be obtained by only establishing and solving the NS equation of the simplified loop, thereby reducing the amount of calculation when calculating the total loop flow, that is, reducing the speed when calculating the flow of the complex water pipeline.

[0193] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0194] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0195] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0196] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0197] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, and improvements made within the spirit and scope of the present application are included in the scope of protection of the present application.

Claims

1. A flow determination method, characterized in that: The method comprises: Performing loop division on the target loop to obtain multiple sub-loops and connection relationships between the multiple sub-loops; Determining multiple sets of loop parameters corresponding to the multiple sub-loops, and determining multiple loop flow resistances based on the multiple sets of loop parameters; determining a total flow resistance of the target circuit according to the multiple circuit flow resistances and the connection relationship; Establishing a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance; An NS equation is established for the simplified loop, and the total loop flow of the target loop is determined according to the NS equation.

2. The method according to claim 1, characterized in that The step of dividing the target loop into multiple sub-loops and obtaining connection relationships between the multiple sub-loops includes: determining a loop switch for controlling the target loop to form a different loop; The target loop is divided according to the loop switch to obtain a plurality of sub-loops and connection relationships between the plurality of sub-loops.

3. The method according to claim 1, characterized in that The determining of multiple groups of loop parameters corresponding to the multiple sub-loops, and determining multiple loop flow resistances based on the multiple groups of loop parameters, includes: determining a plurality of loop flow rates, a plurality of loop pressure drops, and a loop fluid density corresponding to the plurality of sub-loops; The plurality of circuit flow resistances are respectively determined according to the plurality of circuit flow rates, the plurality of circuit pressure drops and the circuit fluid density.

4. The method according to claim 1, wherein Determining the total flow resistance of the target circuit according to the multiple circuit flow resistances and the connection relationship includes: determining a plurality of valve openings in the plurality of sub-circuits; updating the plurality of loop flow resistances respectively according to the plurality of valve openings to obtain a plurality of updated loop flow resistances; The multiple updated loop flow resistances are fused according to the flow resistance fusion method corresponding to the connection relationship to obtain the total flow resistance.

5. The method according to claim 4, characterized in that The step of respectively updating the plurality of loop flow resistances according to the plurality of valve openings to obtain a plurality of updated loop flow resistances includes: Obtaining multiple sets of valve parameters in the multiple sub-circuits; determining a plurality of valve flow resistances according to the plurality of sets of valve parameters and the plurality of valve openings; The updated circuit flow resistances are determined based on the plurality of valve flow resistances and the plurality of circuit flow resistances.

6. The method according to claim 4, characterized in that The connection relationship includes a series relationship and / or a parallel relationship; the flow resistance fusion method corresponding to the connection relationship is used to fuse the multiple updated loop flow resistances to obtain the total flow resistance, including: In the case where the connection relationship is a series relationship, determining the sum of the multiple updated loop flow resistances to obtain the total flow resistance; In the case where the connection relationship is a parallel relationship, the multiple updated loop flow resistances are merged according to the flow resistance fusion method corresponding to the parallel relationship to obtain the total flow resistance; In a case where the connection relationship includes the series relationship and the parallel relationship, the multiple updated loop flow resistances are fused according to the fusion manner corresponding to the series relationship and the parallel relationship to obtain the total flow resistance.

7. The method according to claim 1, characterized in that The water pump model information includes the corresponding relationship between the flow rate, speed and pressure difference during the operation of the water pump in the target circuit. The establishment of the NS equation for the simplified circuit includes: Establishing the mass conservation equation and momentum conservation equation of the simplified loop; Substituting the mass conservation equation and the corresponding relationship into the momentum conservation equation, the NS equation is obtained.

8. The method according to claim 1, characterized in that The method further comprises: When the speed is the rated speed, a first relationship between the pressure difference and the flow rate is established; When the speed is not the rated speed, establishing a second relationship between the pressure difference and the flow rate according to the relationship between the speed and the rated speed and the first relationship; Determining a corresponding relationship according to the first relationship and the second relationship; The corresponding relationship is determined as the water pump model information.

9. The method according to claim 1, characterized in that After determining the total loop flow of the target loop according to the NS equation, the method further includes: According to the total loop flow, the sub-loop flows corresponding to the multiple sub-loops are determined by performing the reverse steps of the flow determination method.

10. A flow determination device, characterized in that: The device comprises: a dividing unit, configured to divide the target loop into multiple sub-loops and connection relationships between the multiple sub-loops; a determination unit, configured to determine multiple sets of loop parameters corresponding to the multiple sub-loops, and determine multiple loop flow resistances based on the multiple sets of loop parameters; determine a total flow resistance of the target loop based on the multiple loop flow resistances and the connection relationship; and determine a total loop flow of the target loop based on the NS equation; An establishing unit is used to establish a simplified circuit corresponding to the target circuit according to the water pump model information corresponding to the water pump in the target circuit and the total flow resistance; and establish the NS equation for the simplified circuit.

11. A flow determination device, characterized in that: The device comprises: a memory for storing computer-executable instructions; The processor is configured to implement the flow determination method according to any one of claims 1 to 9 when executing the computer executable instructions stored in the memory.

12. A computer-readable storage medium storing computer-executable instructions, characterized in that: When the computer-executable instructions are executed by a processor, the method according to any one of claims 1 to 9 is implemented.

13. A computer program product comprising computer executable instructions or a computer program, characterized in that When the computer executable instructions or computer program are executed by a processor, the method according to any one of claims 1 to 9 is implemented.

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