Method and system for constructing cooling system model

Abstract

The invention provides a method and system for constructing a cooling system model, and relates to the technical field of cooling system simulation, and the method comprises the steps: respectively building a first sub-module, a second sub-module, a third sub-module and a fourth sub-module according to a hydraulic curve and parameter data of a part, data information of a pipeline and a characteristic curve of hydraulic oil; the first sub-module, the second sub-module, the third sub-module and the fourth sub-module are reused and connected as required according to the flowing path and channel network of hydraulic oil of the transmission to form a part module; based on the part module, a pressure feedback mode and a flow distribution mode are determined, and an initial cooling system model is established; the flow distribution mode is optimized, then the initial cooling system model is optimized, and the target cooling system model is obtained.The technical problems that in the prior art, a rapid forming-test design-cooling system testing method is long in period and difficult to measure can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling system simulation, and in particular to a method and system for constructing a cooling system model. Background Art

[0002] The power of the power motor and the capacity of the battery used in new energy vehicles are gradually increasing with the demand for longer driving range, and the size of the battery and the power motor are also gradually increasing; therefore, the design of the cooling system of the transmission or reducer becomes particularly important, and it needs to be fully considered in the early stages of system design to ensure that the cooling and lubrication system functions can work reliably under various working conditions.

[0003] At present, in order to ensure the function of the cooling system, a quick prototype is generally formed quickly, and the flow of each lubricated and cooled part under different working conditions is observed through hydraulic tests to design the cooling system. This method prolongs the overall design cycle and increases the workload of design changes; moreover, when the physical prototype is used as a test piece, it is difficult to measure the actual flow of each part because the flowmeter has a large liquid resistance and a large volume, and the cooling system has a low pressure and a small space, and even qualitative observation is difficult. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a method and system for constructing a cooling system model to solve the problems of long cycle and difficult measurement in the "rapid prototyping-experimental design-cooling system testing" method in the background technology.

[0005] One aspect of the present invention provides a method for constructing a cooling system model, the method comprising: Collect hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components, and respectively establish a first submodule, a second submodule, a third submodule, and a fourth submodule; According to the path and channel network of the hydraulic oil flow of the transmission, the first submodule, the second submodule, the third submodule, and the fourth submodule are reused and connected as needed to form a component module; Based on the component modules, determine the pressure feedback method and flow distribution method, and establish an initial cooling system model; The flow distribution method is optimized, and then the initial cooling system model is optimized to obtain the target cooling system model.

[0006] Compared with the prior art, the beneficial effects of the present invention are: according to the path and channel network of the hydraulic oil flow of the transmission, the first submodule, the second submodule, the third submodule, and the fourth submodule are reused and connected as needed to form a component module; based on the component module, the pressure feedback method and the flow distribution method are determined to establish an initial cooling system model; the flow distribution method is optimized, and then the initial cooling system model is optimized to obtain a target cooling system model, which can quickly establish a complex target cooling system model and shorten the design cycle, thereby solving the technical problems of the "rapid prototyping-experimental design-cooling system testing" method, which has a long cycle and difficult measurement.

[0007] According to one aspect of the above technical solution, the steps of collecting hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components and establishing the first submodule, the second submodule, the third submodule and the fourth submodule respectively include: Conduct hydraulic pressure-flow tests on testable components at different temperatures to obtain pressure-flow characteristic curves, build a first-class model based on simulink software, and obtain the first submodule; Determine whether the untested parts have hydraulic test data. If so, the pressure-flow characteristic curve is calculated according to the hydraulic test data, and the second type of model is constructed based on the simulink software to obtain the second submodule. If not, the untested parts are calculated using the fluid resistance formula to establish the second type of model and obtain the second submodule; According to the diameter and length of the pipe of the component, the pressure loss along the way is calculated, and according to the diameter change and bending change of the pipe of the component, the local pressure loss is calculated, and the third type of model is established to obtain the third submodule; According to the characteristics of the hydraulic oil, the characteristic curve of the density and viscosity of the hydraulic oil changing with temperature is used to establish the fourth type of model and obtain the fourth submodule.

[0008] According to one aspect of the above technical solution, the step of calculating the pressure loss along the pipeline according to the diameter and length of the component specifically includes: If the pipe section of the component is circular, calculate the pressure loss along the pipe based on the diameter and length of the pipe; If the pipe cross-section of the component is non-circular, the equivalent hydraulic radius method is used to calculate the radius of the pipe. The formula is as follows:

[0009] in, is the radius of the pipe, is the cross-sectional area of ​​the pipe, is the circumference of the cross section of the pipe, Calculate the pressure loss along the pipeline based on its radius and length.

[0010] According to one aspect of the above technical solution, the optimization step of the flow distribution method specifically includes: By changing key parameters, including the pipe diameter or cross-sectional shape, the aperture of the oil nozzle, and adjusting the hydraulic resistance of each part of the cooling system model, the flow distribution method is optimized.

[0011] According to one aspect of the above technical solution, based on the component module, the step of determining the pressure feedback method specifically includes: Based on the component module, the pressure information generated by the components is collected, including hydraulic pressure, along-the-line pressure, local pressure, and the fluid resistance generated by each segment of the oil circuit where the hydraulic oil flows, and forward feedback is performed segment by segment to determine the pressure feedback method and form the outlet pressure of the oil pump at the oil pump. Among them, the connection methods of the oil circuits include oil circuit series method and oil circuit parallel method. The oil circuit series method is that the flow rate of each section of the pipeline remains unchanged, and the total liquid resistance is the sum of the liquid resistance of each section of the pipeline. The oil circuit parallel method is that the liquid resistance of each section of the pipeline is the same, and the total flow rate is the sum of the flow rates of each section of the pipeline.

[0012] According to one aspect of the above technical solution, the step of optimizing the flow distribution method further includes: If the oil circuit connection mode is oil circuit parallel mode, determine whether the oil circuit is in a steady state or a non-steady state; If the oil circuit is in a steady state, the pressure drops in each branch of the oil circuit are equal; If the oil circuit is in a non-steady state, the flow rate of the branch is adjusted until the pressure drops of each branch of the oil circuit are equal to reach a steady state.

[0013] According to one aspect of the above technical solution, if the oil circuit is in a non-steady state, the steps of adjusting the flow of the branch until the pressure drops of the branches of the oil circuit are equal to reach a steady state specifically include: If the oil circuit is in a non-steady state, calculate the unbalance coefficient of the oil circuit, the formula is as follows:

[0014] in, is the unbalance coefficient, is the liquid resistance of branch 1 at time t, is the liquid resistance of branch 2 at time t; According to the imbalance coefficient, the flow rate of the branch is adjusted until the pressure drop of each branch of the oil circuit is equal and reaches a steady state. The calculation formula is as follows:

[0015] in, is the flow of branch 1 at time t+1, is the flow of branch 2 at time t+1, is the flow of branch 1 at time t, is the flow of branch 2 at time t.

[0016] A second aspect of the present invention provides a system for constructing a cooling system model, the system being used to execute the above method for constructing a cooling system model, the system comprising: The submodule construction module is used to collect hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components, and respectively establish a first submodule, a second submodule, a third submodule, and a fourth submodule; A component module construction module, for multiplexing and connecting the first submodule, the second submodule, the third submodule, and the fourth submodule as needed to form a component module according to the path and channel network of the hydraulic oil flow of the transmission; An initial model building module, used to determine a pressure feedback method and a flow distribution method based on the component modules, and to establish an initial cooling system model; The target model building module is used to optimize the flow distribution method, thereby optimizing the initial cooling system model to obtain a target cooling system model.

[0017] A third aspect of the present invention provides a readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the steps of the above-mentioned method for constructing a cooling system model.

[0018] A fourth aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for constructing a cooling system model when executing the program. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of a method for constructing a cooling system model in Embodiment 1 of the present invention; Figure 2 This is a structural diagram of a pressure feedback method in Embodiment 1 of the present invention; Figure 3 This is a structural diagram of unbalance coefficient calculation in Embodiment 1 of the present invention; Figure 4 This is a diagram of a steady-state regulation structure in Embodiment 1 of the present invention; Figure 5 A system structure block diagram of a cooling system model constructed in Embodiment 2 of the present invention; Component symbol description: Oil pump module 21, speed sensor 22, oil temperature sensor 23, pre-injection flow resistance calculation module 24, spray resistance calculation module 25, sampling delay module 26, accumulated pressure signal module 27, Add8 addition module 31, Add9 addition module 32, Divide multiplication and division module 33, Gain gain module 34, Unit Delay9 sampling delay module 35, input signal 2 module 41, input signal 1 module 42, signal processing module 43, multiplication module 44, Subtract19 module 45, Add8 module 46, submodule construction module 100, component module construction module 200, initial model construction module 300, target model construction module 400; The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] Embodiment 1 See also Figure 1 , which shows a method for constructing a cooling system model in a first embodiment of the present invention, including steps S10 to S13.

[0023] Step S10, collecting hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components, and establishing a first submodule, a second submodule, a third submodule, and a fourth submodule respectively; Specifically, in step S100, a hydraulic pressure-flow test is performed on the testable components at different temperatures to obtain a pressure-flow characteristic curve, and a first type of model is constructed based on simulink software to obtain a first submodule; For example, hydraulic pumps, oil coolers, filters, etc. use pressure-flow characteristic curves obtained through tests at different temperatures. Step S101, determine whether the untested parts have hydraulic test data, If so, the pressure-flow characteristic curve is calculated according to the hydraulic test data, and the second type of model is constructed based on the simulink software to obtain the second submodule. If not, the untested parts are calculated using the fluid resistance formula to establish the second type of model and obtain the second submodule; For example, the spray pipe is an actuator for cooling and lubrication. If a single product hydraulic test has been carried out to obtain the pressure-flow characteristic curve, the simulink method can be used to establish a mathematical model. However, in actual design, new spray pipes may be generated, such as different nozzle diameters, different nozzle numbers, etc. At this time, the model is appropriately simplified, and the free flow outlet resistance calculation formula is used to calculate the data and establish the second type of model.

[0024] As an example but not a limitation, the simplified model includes: 1. The pressure of different nozzles before spraying is set to be the same, and the liquid flow resistance inside the spray pipe is not taken into account. 2. The liquid pressure at the nozzle is 0, and the kinetic energy carried away by the liquid flow rate is included in the pressure loss along the way. 3. When the pipeline diameter is large and the length is small, each nozzle satisfies the flow law of the parallel oil circuit. However, when the diameters of the nozzles are very different, or the diameter of the spray pipe itself is small and the liquid flow resistance is large, the spray pipe should be segmented and the resistance to the flow of the pipeline fluid should be taken into account.

[0025] Step S102, calculating the pressure loss along the pipeline according to the diameter and length of the component, calculating the local pressure loss according to the diameter change and bending change of the pipeline of the component, establishing the third type of model, and obtaining the third submodule; By way of example but not limitation, the along-the-way pressure loss and the local pressure loss are calculated using the along-the-way resistance calculation formula and the local resistance calculation formula of the fluid flow, respectively.

[0026] Among them, the cross-section of some pipes is not circular, for example, the cooling oil channel in the stator of the power motor. When the stator silicon steel sheet is manufactured, the stamping process on the silicon steel sheet forms a local hole (non-circular), and the oil channel is formed after multiple sheets are stacked. The equivalent hydraulic radius method is used to calculate the equivalent circular tube of the non-circular cross-section pipe, and the equivalent circular tube is used for calculation. This method takes into account the liquid flow characteristics of the pipeline, and the calculation result is closer to the actual pipeline.

[0027] Specifically, if the pipe cross-section of the component is circular, calculate the pressure loss along the pipe based on the diameter and length of the pipe; If the pipe cross-section of the component is non-circular, the equivalent hydraulic radius method is used to calculate the radius of the pipe. The formula is as follows:

[0028] in, is the radius of the pipe, is the cross-sectional area of ​​the pipe, is the circumference of the cross section of the pipe, Calculate the pressure loss along the pipeline based on its radius and length.

[0029] In addition, the local pressure loss of the pipeline includes the pressure loss caused by diameter change and the pressure loss caused by pipeline bending. The number of pipeline bending times is calculated according to the direction of the pipeline. That is, a more accurate estimate can be obtained by combining the number of bending times with the layout direction of components and the direction of the shell or pipeline.

[0030] Step S103, according to the characteristics of the hydraulic oil, the characteristic curve of the density and viscosity of the hydraulic oil changing with the temperature is used to establish a fourth type of model to obtain a fourth submodule.

[0031] Step S11, according to the path and channel network of the hydraulic oil flow of the transmission, the first submodule, the second submodule, the third submodule, and the fourth submodule are reused and connected as needed to form a component module; Step S12, based on the component modules, determining a pressure feedback method and a flow distribution method, and establishing an initial cooling system model; Specifically, based on the component module, the pressure information generated by the component is collected, including hydraulic pressure, along-the-line pressure, local pressure, and the fluid resistance generated by each segment of the oil circuit where the hydraulic oil flows, and forward feedback is performed segment by segment to determine the pressure feedback method, and the outlet pressure of the oil pump is formed at the oil pump. Among them, the connection method of the oil circuit includes an oil circuit series method and an oil circuit parallel method. The oil circuit series method is that the flow rate of each section of the pipeline remains unchanged, and the total liquid resistance is the sum of the liquid resistance of each section of the pipeline. The oil circuit parallel method is that the liquid resistance of each section of the pipeline is the same, and the total flow rate is the sum of the flow rates of each section of the pipeline.

[0032] In addition, pressure information also includes the fluid resistance of functional components, pressure loss caused by spray pipe injection, etc.

[0033] See also Figure 2 , shown is a schematic diagram of the generation and forward feedback of pressure. Starting from the oil pump module 21, combined with the speed of the input speed sensor 22, the oil temperature of the oil temperature sensor 23 and other information, after a series of calculations and signal processing such as the pre-injection flow resistance calculation module 24 and the spray resistance calculation module 25, the pressure result is finally output in the accumulated pressure signal module 27, among which the sampling delay module 26 participates in the signal processing process and is used to analyze the mechanism of pressure generation and feedback.

[0034] Step S13, optimizing the flow distribution mode, and then optimizing the initial cooling system model to obtain a target cooling system model.

[0035] The optimization steps of the traffic distribution method specifically include: By changing key parameters, including the pipe diameter or cross-sectional shape, the aperture of the oil nozzle, and adjusting the hydraulic resistance of each part of the cooling system model, the flow distribution method is optimized.

[0036] In addition, the optimization step of the flow distribution method also includes: If the oil circuit connection mode is oil circuit parallel mode, determine whether the oil circuit is in a steady state or a non-steady state; If the oil circuit is in a steady state, the pressure drops in each branch of the oil circuit are equal; If the oil circuit is in a non-steady state, the flow rate of the branch is adjusted until the pressure drops of each branch of the oil circuit are equal to reach a steady state.

[0037] It should be noted that for the flow splitting situation with two branches, under the initial distribution ratio, both branches obtain a certain flow rate, which flows through their respective pipelines, and the liquid resistance produces a pressure drop in this section. Under steady-state flow, the pressure drops of the two sections of the pipeline are equal. Under unsteady state, the liquid resistance of the two sections of the pipeline is different, and the liquid flow always tends to flow to the branch with smaller liquid resistance; after the flow rate increases, the liquid resistance increases immediately, and finally reaches a steady state.

[0038] Furthermore, the pressure at the bifurcation point is calculated from the ends of the two branches. If the two pressure values ​​are not equal, the oil circuit is judged to be in an unsteady state, and the imbalance coefficient of the oil circuit is calculated. The formula is as follows:

[0039] in, is the unbalance coefficient, is the liquid resistance of branch 1 at time t, is the liquid resistance of branch 2 at time t; According to the imbalance coefficient, the flow rate of the branch is adjusted until the pressure drop of each branch of the oil circuit is equal and reaches a steady state. The calculation formula is as follows:

[0040] in, is the flow of branch 1 at time t+1, is the flow of branch 2 at time t+1, is the flow of branch 1 at time t, is the flow of branch 2 at time t.

[0041] It should be noted that, obviously, -1≤ ≤1, but there is an extreme case = ±1, the model may fall into oscillation during operation. To avoid this situation, 0.8 is used. replace This adjustment method always keeps each instantaneous data within the valid value range and can also make the system quickly approach a steady state. Compared with the ordinary "PID" control (proportional-integral-differential control) method, the calculation speed is faster.

[0042] See also Figure 3 , shown as The value calculation principle diagram, p1 and p2 are the two branch pressure signals as input, first enter the two Add8 addition modules 31 and Add9 addition modules 32 for addition and subtraction operations, and the operation results enter the Divide multiplication and division module 33 for multiplication and division operations, then pass through the Gain gain module 34, and then pass through the Unit Delay9 sampling delay module 35, and finally output value.

[0043] Figure 4 Schematic diagram for calculating the actual flow adjustment value, input in the input signal 1 module 42 The main oil flow q is input into the input signal 2 module 41, and the signal processing module 43 obtains "p_F1" and "p_F3". A part of "p_F3" is The value is calculated by the multiplication module 44, and the result obtained is added or subtracted with the result obtained by the other part after being processed by the Subtract19 module 45, and the adjusted branch flow "qa" of a branch is output; a part of "p_F3" is combined with The value is calculated by the multiplication module 44, and the result and "p_F1" are calculated by the Add8 module 46 to output the adjusted branch flow "qb" of another branch.

[0044] In summary, the method for constructing a cooling system model in the above-mentioned embodiment of the present invention collects information on parts and components, establishes a part and component module, determines a pressure feedback method and a flow distribution method based on the part and component module, establishes an initial cooling system model, optimizes the flow distribution method, and then optimizes the initial cooling system model to obtain a target cooling system model. It can quickly establish a complex target cooling system model and shorten the design cycle. By optimizing the system, it can effectively improve the design accuracy, thereby solving the technical problems of the "rapid prototyping-experimental design-cooling system testing" method, which has a long cycle and difficult measurement.

[0045] Embodiment 2 See also Figure 5 , which is a system for constructing a cooling system model in a second embodiment of the present invention, and the system comprises: The submodule construction module 100 is used to collect hydraulic curves of components, parameter data, pipeline data information and characteristic curves of hydraulic oil, and respectively establish a first submodule, a second submodule, a third submodule, and a fourth submodule; The component module construction module 200 is used to reuse and connect the first submodule, the second submodule, the third submodule, and the fourth submodule as needed to form a component module according to the path and channel network of the hydraulic oil flow of the transmission; An initial model building module 300 is used to determine a pressure feedback method and a flow distribution method based on the component modules to establish an initial cooling system model; The target model building module 400 is used to optimize the flow distribution method, thereby optimizing the initial cooling system model to obtain a target cooling system model.

[0046] In summary, the system for constructing a cooling system model in the above-mentioned embodiments of the present invention collects information on parts and components through sub-module construction and part module construction, establishes a part and component module, determines a pressure feedback method and a flow distribution method through initial model construction, establishes an initial cooling system model, optimizes the flow distribution method through target model construction, and then optimizes the initial cooling system model to obtain a target cooling system model. It can quickly establish a complex target cooling system model and shorten the design cycle. By optimizing the system, it can effectively improve the design accuracy, thereby solving the technical problems of the "rapid prototyping-experimental design-cooling system testing" method, which has a long cycle and difficult measurement.

[0047] Embodiment 3 The third embodiment of the present invention provides a storage medium on which computer instructions are stored. When the instructions are executed by a processor, the steps of the method described in the first embodiment are implemented. Embodiment 4 A fourth embodiment of the present invention provides a device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the first embodiment when executing the program.

[0048] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be specifically implemented in any computer-readable storage medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0050] More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable storage medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0051] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for constructing a cooling system model, characterized in that: The method comprises: Collect hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components, and respectively establish a first submodule, a second submodule, a third submodule, and a fourth submodule; According to the path and channel network of the hydraulic oil flow of the transmission, the first submodule, the second submodule, the third submodule, and the fourth submodule are reused and connected as needed to form a component module; Based on the component modules, determine the pressure feedback method and flow distribution method, and establish an initial cooling system model; The flow distribution method is optimized, and then the initial cooling system model is optimized to obtain the target cooling system model.

2. The method for constructing a cooling system model according to claim 1, characterized in that: The steps of collecting hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components and establishing the first submodule, the second submodule, the third submodule and the fourth submodule respectively include: Conduct hydraulic pressure-flow tests on testable components at different temperatures to obtain pressure-flow characteristic curves, build a first-class model based on simulink software, and obtain the first submodule; Determine whether the untested parts have hydraulic test data. If so, the pressure-flow characteristic curve is calculated according to the hydraulic test data, and the second type of model is constructed based on the simulink software to obtain the second submodule. If not, the untested parts are calculated using the fluid resistance formula to establish the second type of model and obtain the second submodule; According to the diameter and length of the pipe of the component, the pressure loss along the way is calculated, and according to the diameter change and bending change of the pipe of the component, the local pressure loss is calculated, and the third type of model is established to obtain the third submodule; According to the characteristics of the hydraulic oil, the characteristic curve of the density and viscosity of the hydraulic oil changing with temperature is used to establish the fourth type of model and obtain the fourth submodule.

3. The method for constructing a cooling system model according to claim 2, characterized in that: The steps to calculate the pressure loss along the pipeline based on the diameter and length of the component include: If the pipe section of the component is circular, calculate the pressure loss along the pipe based on the diameter and length of the pipe; If the pipe cross-section of the component is non-circular, the equivalent hydraulic radius method is used to calculate the radius of the pipe. The formula is as follows: in, is the radius of the pipe, is the cross-sectional area of ​​the pipe, is the circumference of the cross section of the pipe, Calculate the pressure loss along the pipeline based on its radius and length.

4. The method for constructing a cooling system model according to claim 1, characterized in that: The optimization steps of the traffic distribution method specifically include: By changing key parameters, including the pipe diameter or cross-sectional shape, the aperture of the oil nozzle, and adjusting the hydraulic resistance of each part of the cooling system model, the flow distribution method is optimized.

5. The method for constructing a cooling system model according to claim 4, characterized in that: Based on the component module, the step of determining the pressure feedback method specifically includes: Based on the component module, the pressure information generated by the components is collected, including hydraulic pressure, along-the-line pressure, local pressure, and the fluid resistance generated by each segment of the oil circuit where the hydraulic oil flows, and forward feedback is performed segment by segment to determine the pressure feedback method and form the outlet pressure of the oil pump at the oil pump. Among them, the connection methods of the oil circuits include oil circuit series method and oil circuit parallel method. The oil circuit series method is that the flow rate of each section of the pipeline remains unchanged, and the total liquid resistance is the sum of the liquid resistance of each section of the pipeline. The oil circuit parallel method is that the liquid resistance of each section of the pipeline is the same, and the total flow rate is the sum of the flow rates of each section of the pipeline.

6. The method for constructing a cooling system model according to claim 5, characterized in that: The optimization step of the flow distribution method further includes: If the oil circuit connection mode is oil circuit parallel mode, determine whether the oil circuit is in a steady state or a non-steady state; If the oil circuit is in a steady state, the pressure drops in each branch of the oil circuit are equal; If the oil circuit is in a non-steady state, the flow rate of the branch is adjusted until the pressure drops of each branch of the oil circuit are equal to reach a steady state.

7. The method for constructing a cooling system model according to claim 6, characterized in that: If the oil circuit is in a non-steady state, the steps of adjusting the flow of the branch until the pressure drops of the branches of the oil circuit are equal to reach a steady state specifically include: If the oil circuit is in a non-steady state, calculate the unbalance coefficient of the oil circuit, the formula is as follows: in, is the unbalance coefficient, is the liquid resistance of branch 1 at time t, is the liquid resistance of branch 2 at time t; According to the imbalance coefficient, the flow rate of the branch is adjusted until the pressure drop of each branch of the oil circuit is equal and reaches a steady state. The calculation formula is as follows: in, is the flow of branch 1 at time t+1, is the flow of branch 2 at time t+1, is the flow of branch 1 at time t, is the flow of branch 2 at time t.

8. A system for constructing a cooling system model, characterized in that: The system is used to execute the method for building a cooling system model according to any one of claims 1 to 7, and the system comprises: The submodule construction module is used to collect hydraulic curves, parameter data, pipeline data information and characteristic curves of hydraulic oil of components, and respectively establish a first submodule, a second submodule, a third submodule, and a fourth submodule; A component module construction module, for multiplexing and connecting the first submodule, the second submodule, the third submodule, and the fourth submodule as needed to form a component module according to the path and channel network of the hydraulic oil flow of the transmission; An initial model building module, used to determine a pressure feedback method and a flow distribution method based on the component modules, and to establish an initial cooling system model; The target model building module is used to optimize the flow distribution method, thereby optimizing the initial cooling system model to obtain a target cooling system model.

9. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for constructing a cooling system model according to any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for constructing a cooling system model according to any one of claims 1 to 7 are implemented.

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