A method and system for constructing a cooling system model

Abstract

The present invention provides a method and system for constructing a cooling system model, relating to the technical field of cooling system simulation. The method includes: respectively establishing a first sub-module, a second sub-module, a third sub-module, and a fourth sub-module according to the hydraulic curve, parameter data, pipeline data information of components, and the characteristic curve of hydraulic oil; according to the flow path and channel network of the hydraulic oil in the transmission, multiplexing and connecting the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as required to form a component module; based on the component module, determining a pressure feedback method and a flow distribution method, and establishing an initial cooling system model; optimizing the flow distribution method, and further optimizing the initial cooling system model to obtain a target cooling system model. The present invention can solve the technical problems of long cycle and difficult measurement in the prior art by the method of "rapid prototyping - experimental design - cooling system test".

Description

Technical Field

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

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

[0003] Currently, in order to ensure the function of the cooling system, generally, a rapid prototype is formed quickly, and through hydraulic tests, the flow rates of each lubricated and cooled part are observed under different working conditions to design the cooling system. This method prolongs the overall design cycle and increases the workload of design changes; moreover, in the case of using a physical prototype as the test piece, due to the large liquid resistance and large volume of the flowmeter, and the low pressure and small space of the cooling system, it is very difficult to measure the actual flow rate of each part, 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 art.

[0005] One aspect of the present invention provides a method for constructing a cooling system model, the method comprising:

[0006] Collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curves of hydraulic oil, and establish a first sub-module, a second sub-module, a third sub-module, and a fourth sub-module respectively;

[0007] According to the flow path and channel network of the hydraulic oil in the transmission, multiplex and connect the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as needed to form a component module;

[0008] Based on the component module, determine the pressure feedback method and the flow distribution method, and establish an initial cooling system model;

[0009] Optimize the flow distribution method, and further optimize the initial cooling system model to obtain a target cooling system model.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: According to the flow path and channel network of the hydraulic oil in the transmission, the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module are multiplexed and connected as needed to form a component module; based on the component module, a pressure feedback method and a flow distribution method are determined, and an initial cooling system model is established; 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, thus solving the technical problems of long cycle and difficult measurement in the "rapid prototyping - experimental design - cooling system test" method.

[0011] According to one aspect of the above technical solution, the steps of collecting the hydraulic curve, parameter data, pipeline data information of the components, and the characteristic curve of the hydraulic oil, and respectively establishing the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module specifically include:

[0012] Perform hydraulic pressure-flow tests on the testable components at different temperatures to obtain pressure-flow characteristic curves, and construct a first type of model based on Simulink software to obtain the first sub-module;

[0013] Judge whether there is hydraulic test data for the untested components,

[0014] If so, calculate its pressure-flow characteristic curve according to the hydraulic test data, and construct a second type of model based on Simulink software to obtain the second sub-module,

[0015] If not, calculate the untested components through the liquid resistance formula, establish a second type of model, and obtain the second sub-module;

[0016] According to the diameter and length of the pipeline of the component, calculate the frictional pressure loss, and according to the diameter change and bending change of the pipeline of the component, calculate the local pressure loss, and establish a third type of model to obtain the third sub-module;

[0017] According to the characteristics of the hydraulic oil, establish a fourth type of model for the characteristic curves of the density and viscosity of the hydraulic oil changing with temperature to obtain the fourth sub-module.

[0018] According to one aspect of the above technical solution, the steps of calculating the frictional pressure loss according to the diameter and length of the pipeline of the component specifically include:

[0019] If the cross-section of the pipeline of the component is circular, calculate the frictional pressure loss according to the diameter and length of the pipeline;

[0020] If the cross-section of the pipeline of the component is non-circular, use the equivalent hydraulic radius method to calculate the radius of the pipeline, and the formula is as follows:

[0021]

[0022] Among them, is the radius of the pipeline, is the cross-sectional area of the pipeline, is the perimeter of the cross-section of the pipeline,

[0023] Calculate the frictional pressure loss along the pipeline according to the radius and length of the pipeline.

[0024] According to one aspect of the above technical solution, the optimization steps of the flow distribution method specifically include:

[0025] By changing the key parameters, where the key parameters include the pipeline diameter or cross-sectional shape, and the aperture of the oil nozzle, adjust the hydraulic resistance of each part of the cooling system model, so as to optimize the flow distribution method.

[0026] According to one aspect of the above technical solution, the steps of determining the pressure feedback method based on the component module specifically include:

[0027] Based on the component module, collect the pressure information generated by the components, including hydraulic pressure, frictional pressure, local pressure, and the liquid resistance generated by each section of the oil circuit where the hydraulic oil flows, and perform forward feedback section by section to determine the pressure feedback method, and form the outlet pressure of the oil pump at the oil pump.

[0028] Among them, the connection methods of the oil circuit include the series connection method of the oil circuit and the parallel connection method of the oil circuit. The series connection method of the oil circuit is that the flow rate of each section of the pipeline remains unchanged, and the total liquid resistance is the sum of the liquid resistances of each section of the pipeline. The parallel connection method of the oil circuit is that the liquid resistances of each section of the pipeline are the same, and the total flow rate is the sum of the flow rates of each section of the pipeline.

[0029] According to one aspect of the above technical solution, the optimization steps of the flow distribution method further include:

[0030] If the connection method of the oil circuit is the parallel connection method of the oil circuit, determine whether the oil circuit is in a steady state or a non-steady state;

[0031] If the oil circuit is in a steady state, the pressure drops of each branch of the oil circuit are equal;

[0032] If the oil circuit is in a non-steady state, adjust the flow rate of the branch until the pressure drops of each branch of the oil circuit are equal to reach a steady state.

[0033] 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 rate of the branch until the pressure drops of each branch of the oil circuit are equal to reach a steady state specifically include:

[0034] If the oil circuit is in a non-steady state, calculate the imbalance coefficient of the oil circuit. The formula is as follows:

[0035]

[0036] Among them, is the imbalance coefficient, is the hydraulic resistance of branch 1 at time t, is the hydraulic resistance of branch 2 at time t;

[0037] According to the said imbalance coefficient, adjust the flow rate of the branch until the pressure drops of all branches of the oil circuit are equal, reaching a steady state. The calculation formula is as follows:

[0038]

[0039] Among them, is the flow rate of branch 1 at time t + 1, is the flow rate of branch 2 at time t + 1, is the flow rate of branch 1 at time t, is the flow rate of branch 2 at time t.

[0040] The second aspect of the present invention provides a system for constructing a cooling system model. The system is used to execute the method for constructing a cooling system model as described above. The system includes:

[0041] The sub-module construction module is used to collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curves of hydraulic oil, and respectively establish the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module;

[0042] The component module construction module is used to reuse and connect the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as needed according to the path and channel network of the hydraulic oil flow in the transmission to form a component module;

[0043] The initial model construction module is used to determine the pressure feedback method and the flow rate distribution method based on the component module, and establish an initial cooling system model;

[0044] The target model construction module is used to optimize the flow rate distribution method, and further optimize the initial cooling system model to obtain a target cooling system model.

[0045] The third aspect of the present invention provides a readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method for constructing a cooling system model as described above are implemented.

[0046] The fourth aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method for constructing a cooling system model as described above are implemented. Brief Description of the Drawings

[0047] Figure 1 It is a flowchart of the method for constructing a cooling system model in the first embodiment of the present invention;

[0048] Figure 2 It is a structural diagram of the pressure feedback mode in the first embodiment of the present invention;

[0049] Figure 3 It is a structural diagram for calculating the imbalance coefficient in the first embodiment of the present invention;

[0050] Figure 4 It is a structural diagram of the steady-state regulation in the first embodiment of the present invention;

[0051] Figure 5 It is a system structure block diagram for constructing a cooling system model in the second embodiment of the present invention;

[0052] Description of the symbols of the components in the drawings:

[0053] Oil pump module 21, rotational 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, sub-module construction module 100, component module construction module 200, initial model construction module 300, target model construction module 400;

[0054] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0055] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown 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, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein 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.

[0057] Embodiment 1

[0058] Please refer to Figure 1 , which shows the method for building a cooling system model in the first embodiment of the present invention, including steps S10 - S13.

[0059] Step S10: Collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curve of hydraulic oil, and establish the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module respectively;

[0060] Specifically, in step S100, perform hydraulic pressure-flow tests on testable components at different temperatures to obtain pressure-flow characteristic curves, and build a first type of model based on Simulink software to obtain the first sub-module;

[0061] For example, hydraulic pumps, oil coolers, filters, etc., use the pressure-flow characteristic curves obtained through tests at different temperatures.

[0062] Step S101: Determine whether there is hydraulic test data for untested components,

[0063] If so, calculate its pressure-flow characteristic curve based on the hydraulic test data, and build a second type of model based on Simulink software to obtain the second sub-module,

[0064] If not, calculate for untested components through the liquid resistance formula, build a second type of model, and obtain the second sub-module;

[0065] For example, the spray pipe is an actuator for cooling and lubrication. If a single-piece hydraulic test has been performed to obtain the pressure-flow characteristic curve, a mathematical model can be established using the Simulink method. However, in actual design, new spray pipes may be generated, such as different nozzle diameters and different nozzle numbers. At this time, the model is appropriately simplified, and the free-flow outlet resistance calculation formula is used to calculate data and build a second type of model.

[0066] By way of example and not limitation, the model simplification includes: First, set the pressure before spraying of different nozzles to be the same, and ignore the liquid flow resistance inside the spray pipe. Second, the liquid pressure at the nozzle is 0, and the kinetic energy carried away by the liquid velocity is included in the frictional pressure loss. Third, when the pipe diameter is large and the length is small, each nozzle satisfies the parallel oil circuit flow law. However, when the difference in nozzle diameters is large, 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 frictional resistance of the pipe fluid flow should be included.

[0067] Step S102: Calculate the frictional pressure loss based on the diameter and length of the pipelines of the components, calculate the local pressure loss based on the diameter changes and bends of the pipelines of the components, establish a third - type model, and obtain the third sub - module;

[0068] By way of example rather than limitation, the frictional pressure loss and the local pressure loss are calculated through the formula for calculating the frictional resistance along the flow of the fluid and the formula for calculating the local resistance respectively.

[0069] Among them, the cross - section of some pipelines is not circular. For example, the cooling oil duct inside the stator of the power motor. When manufacturing the stator silicon steel sheets, local holes (non - circular) are formed by stamping on the silicon steel sheets, and the oil duct is formed after multiple sheets are stacked. The equivalent hydraulic radius method is used to calculate the equivalent circular pipe of the non - circular cross - section pipeline, and the equivalent circular pipe is used for calculation. This method takes into account the liquid flow characteristics of the pipeline, and the calculation result is relatively close to the actual pipeline.

[0070] Specifically, if the cross - section of the pipeline of the component is circular, calculate the frictional pressure loss according to the diameter and length of the pipeline;

[0071] If the cross - section of the pipeline of the component is non - circular, use the equivalent hydraulic radius method to calculate the radius of the pipeline. The formula is as follows:

[0072]

[0073] Among them, is the radius of the pipeline, is the cross - sectional area of the pipeline, is the perimeter of the cross - section of the pipeline,

[0074] Calculate the frictional pressure loss according to the radius and length of the pipeline.

[0075] In addition, the local pressure loss of the pipeline includes the pressure loss due to diameter changes and the pressure loss caused by pipeline bends. The number of bends of the pipeline is calculated according to the pipeline orientation, that is, by combining the number of bends with the layout direction of the components, the shell or the pipeline orientation, a more accurate estimated value can be obtained.

[0076] Step S103: Based on the characteristics of the hydraulic oil, establish a fourth - type model for the characteristic curves of the density and viscosity of the hydraulic oil varying with temperature, and obtain the fourth sub - module.

[0077] Step S11: According to the path and channel network of the hydraulic oil flow in the transmission, reuse and connect the first sub - module, the second sub - module, the third sub - module, and the fourth sub - module as needed to form a component module;

[0078] Step S12: Based on the component module, determine the pressure feedback method and the flow distribution method, and establish an initial cooling system model;

[0079] Specifically, based on the component modules, pressure information generated by the components is collected, including hydraulic pressure, pressure along the way, local pressure, and liquid resistance generated by each section of the oil circuit through which the hydraulic oil flows. Forward feedback is carried out section by section to determine the pressure feedback method, and the outlet pressure of the oil pump is formed at the oil pump.

[0080] Among them, the connection methods of the oil circuit include the series connection method of the oil circuit and the parallel connection method of the oil circuit. The series connection method of the oil circuit is that the flow rate of each section of the pipeline remains unchanged, and the total liquid resistance is the sum of the liquid resistances of each section of the pipeline. The parallel connection method of the oil circuit 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.

[0081] In addition, the pressure information also includes the liquid resistance of functional components, the pressure loss generated by the spraying of the spray pipe, etc.

[0082] Please refer to Figure 2 , which shows the schematic diagram of the generation and forward feedback of pressure. Starting from the oil pump module 21, combining information such as the rotational speed of the input rotational speed sensor 22 and the oil temperature of the oil temperature sensor 23, after a series of calculations and signal processing by the pre-injection flow resistance calculation module 24, the spray resistance calculation module 25, etc., the pressure result is finally output by the cumulative pressure signal module 27. Among them, the sampling delay module 26 participates in the signal processing process and is used to analyze the mechanism of pressure generation and feedback.

[0083] Step S13, optimize the flow distribution method, and then optimize the initial cooling system model to obtain the target cooling system model.

[0084] The optimization steps of the flow distribution method specifically include:

[0085] By changing the key parameters, the key parameters include the pipeline diameter or cross-sectional shape, the aperture of the oil nozzle, adjust the hydraulic resistance of each part of the cooling system model, so as to optimize the flow distribution method.

[0086] In addition, the optimization steps of the flow distribution method also include:

[0087] If the oil circuit connection method is the parallel connection method of the oil circuit, judge whether the oil circuit is in a steady state or a non-steady state;

[0088] If the oil circuit is in a steady state, the pressure drops of each branch of the oil circuit are equal;

[0089] If the oil circuit is in a non-steady state, adjust the flow rate of the branch until the pressure drops of each branch of the oil circuit are equal to reach a steady state.

[0090] It should be noted that for the shunt situation with two branches, at the initial distribution ratio, both branches obtain a certain flow rate. This flow rate flows through their respective pipelines, and the liquid resistance generates the pressure drop of this section. Under steady-state flow, the pressure drops of the two pipelines are equal. Under unsteady state, the liquid resistances of the two pipelines are different, and the liquid flow always tends to flow to the branch with a smaller liquid resistance; after the flow rate increases, the liquid resistance increases immediately and finally reaches a steady state.

[0091] Furthermore, by calculating the pressure at the bifurcation point from the ends of the two branches in reverse, if the two pressure values are not equal, it is determined that the oil circuit is in an unsteady state, and the imbalance coefficient of the oil circuit is calculated. The formula is as follows:

[0092]

[0093] Where, is the imbalance coefficient, is the liquid resistance of branch 1 at time t, is the liquid resistance of branch 2 at time t;

[0094] According to the said imbalance coefficient, the flow rate of the branch is adjusted until the pressure drops of all branches of the oil circuit are equal and a steady state is reached. The calculation formula is as follows:

[0095]

[0096] Where, is the flow rate of branch 1 at time t + 1, is the flow rate of branch 2 at time t + 1, is the flow rate of branch 1 at time t, is the flow rate of branch 2 at time t.

[0097] It should be noted that obviously, -1 ≤ ≤ 1, but there is an extreme case where = ±1. At this time, the model may fall into oscillation during operation. To avoid this situation, 0.8 is used to replace . This adjustment method always keeps each instantaneous data within the effective value range and can also make the system quickly approach the steady state. Compared with the ordinary "PID" control (Proportional-Integral-Derivative control) method, the calculation speed is faster.

[0098] Please refer to Figure 3 which shows the schematic diagram of the value calculation. p1 and p2 are used as the pressure signals of the two input branches. First, they enter the two Add8 adder modules 31 and Add9 adder module 32 respectively for addition and subtraction operations. 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 through the Unit Delay9 sampling delay module 35, and finally output Value

[0099] Figure 4 Schematic diagram for calculating the actual flow adjustment value. At the input signal 1 module 42, input value. At the input signal 2 module 41, input the main oil path flow rate q. After passing through the signal processing module 43, obtain "p_F1" and "p_F3". A part of "p_F3" is multiplied by the value through the multiplication module 44. The result obtained is subjected to addition and subtraction operations with the result obtained after processing by the Subtract19 module 45 for another part, and the adjusted branch flow rate "qa" of one branch is output; a part of "p_F3" is

[0100] multiplied by the

[0101] Value through the multiplication module 44. The result obtained is operated with "p_F1" through the Add8 module 46, and the adjusted branch flow rate "qb" of another branch is output.

[0102] Please refer to Figure 5 , which shows the system for constructing a cooling system model in the second embodiment of the present invention. The system includes:

[0103] Sub-module construction module 100, which is used to collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curves of hydraulic oil, and respectively establish the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module;

[0104] Component module construction module 200, which is used to reuse and connect the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as needed according to the path and channel network of the hydraulic oil flow in the transmission to form a component module;

[0105] Initial model construction module 300, which is used to determine the pressure feedback method and the flow distribution method based on the component module, and establish an initial cooling system model;

[0106] The target model construction module 400 is configured to optimize the flow distribution method, and further optimize the initial cooling system model to obtain a target cooling system model.

[0107] In summary, for the system for constructing a cooling system model in the above embodiments of the present invention, component information is collected through sub-module construction and component module construction to establish a component module. The pressure feedback method and the flow distribution method are determined through initial model construction to establish an initial cooling system model. The flow distribution method is optimized through target model construction, and further the initial cooling system model is optimized to obtain a target cooling system model, which can quickly establish a complex target cooling system model, shorten the design cycle, and effectively improve the design accuracy by optimizing the system, thus solving the technical problems of long cycle and difficult measurement in the "rapid prototyping - experimental design - cooling system test" method.

[0108] Embodiment III

[0109] The third embodiment of the present invention provides a storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the steps of the method described in Embodiment I are implemented.

[0110] Embodiment IV

[0111] The fourth embodiment of the present invention provides a device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method described in Embodiment I are implemented.

[0112] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, 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, it should be considered to be within the scope described in this specification.

[0113] Those skilled in the art can understand that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device.

[0114] More specific examples (a non-exhaustive list) of computer-readable storage media include the following: electrical connection parts (electronic devices) with one or more wirings, portable computer disk cartridges (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable storage media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing when necessary, and then storing it in a computer memory.

[0115] 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 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, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with suitable combinational logic gate circuits, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0116] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0117] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A method for constructing a cooling system model, characterized in that The method includes: Collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curves of hydraulic oil, and establish the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module respectively, including: Conduct hydraulic pressure-flow tests on testable components at different temperatures to obtain pressure-flow characteristic curves, build a first type of model based on Simulink software, and obtain the first sub-module. Judge whether there is hydraulic test data for untested components. If so, calculate its pressure-flow characteristic curve according to the hydraulic test data, build a second type of model based on Simulink software, and obtain the second sub-module. If not, calculate for the untested components through the liquid resistance formula, build a second type of model, and obtain the second sub-module. Calculate the frictional pressure loss according to the diameter and length of the pipeline of the component, and calculate the local pressure loss according to the diameter change and bending change of the pipeline of the component, build a third type of model, and obtain the third sub-module. According to the characteristics of the hydraulic oil, establish a fourth type of model for the characteristic curves of the density and viscosity of the hydraulic oil changing with temperature, and obtain the fourth sub-module. According to the flow path and channel network of the hydraulic oil flowing in the transmission, reuse and connect the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as needed to form a component module. Based on the component module, determine the pressure feedback method and the flow distribution method, and establish an initial cooling system model. Optimize the flow distribution method, and further optimize the initial cooling system model to obtain the target cooling system model.

2. The method for constructing a cooling system model according to claim 1, wherein The step of calculating the frictional pressure loss according to the diameter and length of the pipeline of the component specifically includes: If the cross-section of the pipeline of the component is circular, calculate the frictional pressure loss according to the diameter and length of the pipeline. If the cross-section of the pipeline of the component is non-circular, use the equivalent hydraulic radius method to calculate the radius of the pipeline. The formula is as follows: Among them, is the radius of the pipe, is the cross-sectional area of the pipe, is the perimeter of the cross-section of the pipe, Calculate the frictional pressure loss according to the radius and length of the pipeline.

3. The method for constructing a cooling system model according to claim 1, wherein The optimization step of the flow distribution method specifically includes: By changing the key parameters, the key parameters include the pipeline diameter or cross-sectional shape, and the aperture of the oil nozzle, adjust the hydraulic resistance of each part of the cooling system model, so as to optimize the flow distribution method.

4. The method for constructing a cooling system model according to claim 3, characterized in that, The step of determining the pressure feedback method based on the component module specifically includes: Based on the component module, collect the pressure information generated by the component, including hydraulic pressure, frictional pressure, local pressure, and the liquid resistance generated by each section of the oil circuit where the hydraulic oil flows, and perform forward feedback section by section to determine the pressure feedback method, and form the outlet pressure of the oil pump at the oil pump. Among them, the connection method of the oil circuit includes the oil circuit series connection method and the oil circuit parallel connection method. The oil circuit series connection 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 resistances of each section of the pipeline. The oil circuit parallel connection 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.

5. The method for constructing a cooling system model according to claim 4, wherein, The optimization step of the flow distribution method further includes: If the oil circuit connection method is the oil circuit parallel connection method, judge 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 of all branches of the oil circuit are equal; If the oil circuit is in an unsteady state, adjust the flow rate of the branches until the pressure drops of all branches of the oil circuit are equal to reach the steady state.

6. The method for constructing a cooling system model according to claim 5, wherein If the oil circuit is in an unsteady state, the steps to adjust the flow rate of the branches until the pressure drops of all branches of the oil circuit are equal to reach the steady state specifically include: If the oil circuit is in an unsteady state, calculate the imbalance coefficient of the oil circuit, and the formula is as follows: wherein, 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, adjust the flow rate of the branches until the pressure drops of all branches of the oil circuit are equal to reach the steady state, and the calculation formula is as follows: Among them, is the flow rate of branch 1 at time t+1, is the flow rate of branch 2 at time t+1, is the flow rate of branch 1 at time t, is the flow rate of branch 2 at time t.

7. A system for constructing a cooling system model, characterized in that, The system is used to execute the method for constructing a cooling system model according to any one of claims 1 to 6, and the system includes: The sub-module construction module is used to collect the hydraulic curves, parameter data, pipeline data information of components, and the characteristic curves of hydraulic oil, and respectively establish a first sub-module, a second sub-module, a third sub-module, and a fourth sub-module, including: Perform hydraulic pressure-flow tests on testable components at different temperatures to obtain pressure-flow characteristic curves, and build a first type of model based on Simulink software to obtain the first sub-module. Judge whether there is hydraulic test data for untested components. If so, calculate its pressure-flow characteristic curve according to the hydraulic test data, and build a second type of model based on Simulink software to obtain the second sub-module. If not, calculate for untested components through the liquid resistance formula, establish a second type of model, and obtain the second sub-module. Calculate the frictional pressure loss according to the diameter and length of the pipeline of the component, and calculate the local pressure loss according to the diameter change and bending change of the pipeline of the component, and establish a third type of model to obtain the third sub-module. According to the characteristics of the hydraulic oil, establish a fourth type of model for the characteristic curves of the density and viscosity of the hydraulic oil changing with temperature to obtain the fourth sub-module; The component module construction module is used to reuse and connect the first sub-module, the second sub-module, the third sub-module, and the fourth sub-module as needed according to the path and channel network of the hydraulic oil flow in the transmission to form a component module; The initial model construction module is used to determine the pressure feedback method and flow distribution method based on the component module and establish an initial cooling system model; The target model construction module is used to optimize the flow distribution method, and further optimize the initial cooling system model to obtain a target cooling system model.

8. A readable storage medium, on which a computer program is stored, characterized in that, When the program is executed by the processor, it implements the steps of the method for constructing a cooling system model according to any one of claims 1 to 6.

9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the method for constructing a cooling system model according to any one of claims 1 to 6.

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