Engine cooling auxiliary system and design method
By building an engine model and optimizing the cooling water flow using fluid simulation software, designing a graded radiator and auxiliary water pump system, the problem of engine cooling inhomogeneity is solved, precise cooling and resource optimization are achieved, and engine performance is improved.
Patent Information
- Application Number
- CN202510598130.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2025-09-05
AI Technical Summary
The existing engine cooling water jacket design cannot meet the uniformity of precise cooling and the cooling capacity of each cylinder at the same time, resulting in excessive or insufficient cooling at different positions of the engine, affecting power and economy.
By constructing an engine model and calculating heat exchange coefficients and temperature field characteristics using fluid simulation software, optimizing cooling water flow, designing a graded radiator and auxiliary water pump system, achieving accurate coolant distribution.
The precise cooling effect of all parts of the engine is achieved, the resource allocation efficiency is optimized, insufficient or excessive cooling is avoided, and the working performance and efficiency of the engine is improved.
Smart Images
Figure CN120597485A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle technology, and in particular to an engine cooling auxiliary system and a design method thereof. Background Art
[0002] The structure of the engine cooling water jacket significantly impacts engine performance, fuel economy, and emissions. In the automotive industry, current improvements to engine cooling water jackets often involve modifying the jacket's local structure, such as by adjusting the cylinder head gasket size, to achieve more precise cooling capacity. However, simply modifying the engine cooling water jacket structure rarely achieves the dual requirements of precise cooling and uniform cooling capacity across cylinders.
[0003] Traditional engine cooling jacket designs rely solely on heat transfer capacity to maintain a constant jacket temperature at the power point, failing to fully consider the complex heat exchange between the coolant and the engine block. Furthermore, the cooling system utilizes a single water pump, with a one-way flow of coolant, consisting of a low-pressure water tank, a radiator, and an expansion tank. This design pattern often results in over- or under-cooling at various engine locations under varying operating conditions, making it difficult to meet the precise cooling requirements demanded by engine power.
[0004] Leading to the following problems:
[0005] 1. In areas with high engine cooling requirements, such as the exhaust side of the cylinder head and the nose bridge of the exhaust manifold, the engine coolant flow rate is not high enough, causing problems such as burning of engine parts and shortening of service life;
[0006] 2. For areas with low engine cooling capacity requirements, such as the area near the cylinder block and the oil pan, a smaller cooling capacity can meet the local cooling needs of the engine. A higher cooling capacity will cause waste of water pump work.
[0007] 3. For operating conditions with low engine cooling requirements, such as cold start, an oversized low-pressure water tank and excessive circulating water will cause the water temperature to rise slowly, affecting engine power and economy.
[0008] 4. For working conditions with high engine cooling requirements, such as power points, the engine cannot achieve precise cooling, resulting in waste of water pump work.
[0009] Therefore, there is an urgent need for an engine cooling auxiliary system and design method that can reasonably allocate the cooling capacity of the engine, achieve precise cooling effects on various parts of the engine, ensure the operation of the engine, and save resources. Summary of the Invention
[0010] The purpose of this application is to provide an engine cooling auxiliary system and its design method, which can reasonably distribute the cooling capacity of the engine and achieve precise cooling effect for various parts of the engine. The specific solution is as follows:
[0011] An engine cooling design method comprises the following steps:
[0012] S1: Using simulation software to construct an original model, the original model includes: an engine and heat exchange components, the heat exchange components including at least: an intake and exhaust manifold, a piston, a combustion chamber, and a cooling water jacket;
[0013] S2: Define the heat transfer area, import the constructed original model data into the fluid simulation software, and use the fluid simulation software to calculate the first heat transfer coefficient and temperature field characteristics of the heat exchange component based on the preset boundary conditions and design goals;
[0014] S3: Based on the first heat transfer coefficient and temperature field characteristics, combined with the structural parameters of the heat exchange component, the heat transfer capacity of each position of the cylinder is compared and analyzed using fluid simulation software, and the first cooling water flow rate of the engine is output;
[0015] S4: Based on the first cooling water flow rate, analyzing the cooling requirements of each cylinder of the engine, and designing a cooling auxiliary system according to the cooling requirement results.
[0016] Optionally, step S2 specifically includes:
[0017] Set transient boundary conditions and use a dynamic mesh model to simulate the intake and exhaust system and piston motion to obtain the first heat transfer coefficient of the intake and exhaust manifold and piston.
[0018] Set steady-state boundary conditions and obtain the first heat transfer coefficient of the cooling water jacket;
[0019] Using the solver, determine whether the first heat transfer coefficients of the intake and exhaust manifolds, pistons, and cooling water jackets are all within the theoretical range;
[0020] If the first heat transfer coefficient falls within the theoretical range, the first heat transfer coefficients of the intake and exhaust manifolds, the piston, and the cooling water jacket are output;
[0021] If the first heat transfer coefficient does not fall within the theoretical range, the solver and the preset boundary conditions are adjusted until the adjusted first heat transfer coefficient falls within the theoretical range, and the adjusted first heat transfer coefficient is output.
[0022] Optional, including:
[0023] Setting a contact interface between the cooling water jacket and the engine; the contact interface at least includes: a solid-liquid contact interface and a solid-solid contact interface;
[0024] The heat transfer of each contact interface is calculated by thermo-solid conjugate solver analysis and the total heat transfer of the contact interface is obtained by summing up.
[0025] According to the comparison result of the total heat exchange amount of each contact interface and the total heat exchange amount required by the engine, a first cooling water flow rate of the engine is output.
[0026] Optionally, outputting a first cooling water flow rate of the engine based on a comparison result of the total heat exchange of each contact interface with the total heat exchange required by the engine specifically includes:
[0027] If the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, the first cooling water flow rate of the engine is output;
[0028] If the total heat exchange of each contact interface is less than the total heat exchange required by the engine, the first cooling water flow rate is adjusted and recalculated until the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, and the adjusted first cooling water flow rate is output.
[0029] Optionally, step S4 includes:
[0030] Based on the first cooling water flow rate, recalculating the cooling water jacket flow in a steady state to obtain a second heat transfer coefficient of the heat exchange interface between the cooling water jacket and the cylinder body;
[0031] resetting the preset boundary conditions based on the first heat transfer coefficient and the second heat transfer coefficient to analyze the cooling requirements of the engine;
[0032] According to the cooling demand analysis results, the engine cooling parameters are obtained, including: coolant flow rate and heat transfer coefficient of each part of the engine;
[0033] Based on the engine's cooling parameters, determine the cooling areas of various engine parts;
[0034] According to the cooling areas of various parts of the engine, the cooling auxiliary system is designed using simulation software.
[0035] Optionally, the cooling areas of various parts of the engine include at least: a high cooling demand area, a middle cooling demand area and a low cooling demand area;
[0036] Select the auxiliary water pump model based on the calculated additional pressure and flow in the high cooling demand area;
[0037] In the low cooling demand area, a flow throttle valve may be arranged;
[0038] A hierarchical heat sink is used to preferentially direct coolant to high-demand areas; wherein the hierarchical heat sink has multiple independently controlled areas inside to distribute coolant according to the cooling needs of different parts.
[0039] An engine cooling auxiliary system is applied to the method described above, the engine cooling auxiliary system comprising:
[0040] Cooling circulation loop; the cooling circulation loop can cooperate with other pathways to distribute the coolant flow according to the cooling needs of the engine;
[0041] The cooling circulation loop comprises at least: an auxiliary water pump and a staged heat dissipation box connected in sequence through pipelines;
[0042] The auxiliary water pump is arranged at the oil passage hole of the cylinder head and is connected to the cylinder head water jacket through a first pipe;
[0043] The water outlet of the cylinder head water jacket is connected to the graded heat dissipation box through a second pipe;
[0044] The hierarchical heat dissipation box has a plurality of independent control areas inside, and an electromagnetic control valve is arranged inside each independent control area.
[0045] A computer device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method.
[0046] A computer-readable storage medium stores a computer program / instruction thereon, which implements the steps of the method when executed by a processor.
[0047] A computer program product comprises a computer program / instructions which, when executed by a processor, implement the steps of the method.
[0048] Compared with the prior art, the present invention has the following beneficial effects:
[0049] This application constructs an original model and uses fluid simulation software for optimization design to obtain the first heat transfer coefficient and temperature field characteristics of the heat exchange component; based on the first heat transfer coefficient and temperature field characteristics, the heat transfer at various positions of the cylinder is compared and analyzed, and the first cooling water flow rate of the engine is output. The cooling auxiliary system is further designed based on the cooling requirements of each cylinder of the engine, thereby achieving precise cooling effects on various parts of the engine and optimizing resource allocation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0050] Figure 1 A flow chart of the engine cooling design method;
[0051] Figure 2 Design flow chart for engine cooling design method;
[0052] Figure 3 This is a connection diagram of the engine cooling auxiliary system.
[0053] In the picture:
[0054] 1-Auxiliary water pump; 2. Staged radiator; 3. Cylinder head water jacket; 4. Other passages. DETAILED DESCRIPTION
[0055] In order to make the purpose, technical solutions and advantages of this application clearer, the following Figure 1-3 This application is further described in detail. Obviously, the embodiments described are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0056] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.
[0057] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.
[0058] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.
[0059] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.
[0060] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.
[0061] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.
[0062] like Figure 1-2 As shown, the present application provides an engine cooling design method, comprising the following steps:
[0063] S1: Using simulation software to construct an original model, the original model includes: an engine and heat exchange components, the heat exchange components including at least: an intake and exhaust manifold, a piston, a combustion chamber, and a cooling water jacket;
[0064] S2: Define the heat transfer area, import the constructed original model data into the fluid simulation software, and use the fluid simulation software to calculate the first heat transfer coefficient and temperature field characteristics of the heat exchange component based on the preset boundary conditions and design goals;
[0065] S3: Based on the first heat transfer coefficient and the three-dimensional structure and temperature field characteristics of the cooling water jacket, the heat transfer capacity at each position of the cylinder is compared and analyzed using fluid simulation software, and the first cooling water flow rate of the engine is output;
[0066] S4: Based on the first cooling water flow rate, analyzing the cooling requirements of each cylinder of the engine, and designing a cooling auxiliary system according to the cooling requirement results.
[0067] Specifically, this application constructs an original model and uses fluid simulation software for optimization design to obtain the first heat transfer coefficient and temperature field characteristics of the heat exchange component; based on the first heat transfer coefficient and temperature field characteristics, the heat transfer capacity of each position of the cylinder is compared and analyzed, and the first cooling water flow rate of the engine is output. The cooling auxiliary system is further designed according to the cooling requirements of each cylinder of the engine, thereby achieving precise cooling effects on various parts of the engine and optimizing resource allocation efficiency.
[0068] In step S2, the heat exchange area is defined, the constructed original model data is imported into the fluid simulation software, and based on the preset boundary conditions and design objectives, the first heat transfer coefficient and temperature field characteristics of the heat exchange component are calculated using the fluid simulation software, including:
[0069] S201: Setting transient boundary conditions, applying a dynamic mesh model to simulate the intake and exhaust system and piston motion, and obtaining a first heat transfer coefficient of the intake and exhaust manifold and the piston;
[0070] The transient boundary conditions are the valve lift curve, piston motion law, injection parameters and airflow boundary conditions; the gas physical field in the intake and exhaust system, such as airflow velocity and gas temperature, is obtained through the first heat transfer coefficient of the intake and exhaust manifold.
[0071] For example, the motion of a piston oil jet cooling system is implemented using the following principle: the piston crown, head, and skirt form the first computational domain, while a layer of mesh outside the oil jet cooling system forms the second computational domain. This outer layer of mesh serves as the exchange surface. The piston crown moves according to transient boundary conditions, causing the cylinder wall mesh to stretch or compress accordingly. The oil jet moves within the first computational domain according to the transient boundary conditions, and the two computational domains transmit information via the exchange surface outside the oil jet.
[0072] S202: Setting steady-state boundary conditions to obtain a first heat transfer coefficient of the cooling water jacket; the steady-state boundary conditions may include an inlet temperature and flow rate of the cooling water jacket;
[0073] S203: Using the solver, determine whether the first heat transfer coefficients of the intake and exhaust manifolds, pistons, and cooling water jackets are all within the theoretical range; the empirical value range of the intake and exhaust manifold heat transfer coefficient is 150-350 W / (m 2 ·K).
[0074] S204: If the first heat transfer coefficient falls within the theoretical range, outputting the first heat transfer coefficients of the intake and exhaust manifolds, the piston, and the cooling water jacket;
[0075] S205: If the first heat transfer coefficient does not fall within the theoretical range, adjust the solver and the preset boundary conditions until the adjusted first heat transfer coefficient falls within the theoretical range, and output the adjusted first heat transfer coefficient.
[0076] As can be understood, by setting transient boundary conditions to simulate the intake and exhaust systems and piston motion, and steady-state boundary conditions to capture cooling water jacket data, we can more accurately simulate the dynamic and static processes of engine operation, making the calculated heat transfer coefficient closer to actual operating conditions and providing high-precision data for subsequent analysis. For example, when calculating the exhaust manifold heat transfer coefficient, dynamic factors such as the valve lift curve and piston motion are taken into account, accurately reflecting the actual heat transfer characteristics of this component during engine operation.
[0077] In a specific embodiment, step S3: based on the first heat transfer coefficient and temperature field characteristics, combined with the structural parameters of the heat exchange component, using fluid simulation software to compare and analyze the heat transfer amount at various positions of the cylinder, and outputting the first cooling water flow rate of the engine, specifically includes:
[0078] Setting a contact interface between the cooling water jacket and the engine; the contact interface includes at least: a solid-liquid contact interface and a solid-solid contact interface; such as the solid-liquid interface between the cylinder block and the coolant, the solid-solid interface between the cylinder block and the cylinder head, etc.;
[0079] The heat transfer of each contact interface is calculated by thermo-solid conjugate solver analysis and the total heat transfer of the contact interface is obtained by summing up.
[0080] According to the comparison result of the total heat exchange amount of each contact interface and the total heat exchange amount required by the engine, a first cooling water flow rate of the engine is output.
[0081] It can be understood that by considering solids and fluids, such as the heat exchange between coolants of various engine components, through the thermo-solid conjugate solver, the heat exchange amount can be calculated more accurately, thereby determining the minimum cooling water flow rate that meets the cooling requirements, that is, the first cooling water flow rate, to avoid energy waste or insufficient cooling caused by excessive or insufficient flow rate. Through multiple contact interfaces (solid-liquid, solid-solid), the heat exchange conditions of various engine components are comprehensively analyzed to ensure the comprehensiveness and accuracy of the calculation results.
[0082] Furthermore, outputting a first cooling water flow rate of the engine based on a comparison result of the total heat exchange of each contact interface with the total heat exchange required by the engine specifically includes:
[0083] If the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, the first cooling water flow rate of the engine is output;
[0084] If the total heat exchange of each contact interface is less than the total heat exchange required by the engine, the first cooling water flow rate is adjusted and recalculated until the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, and the adjusted first cooling water flow rate is output.
[0085] It can be understood that dynamically adjusting the cooling water flow rate based on the simulation calculation results can adapt to the needs of engines of different models and different working conditions. By modifying the boundary conditions of the simulation model (such as engine speed and load), the cooling water flow rate under the corresponding working conditions can be quickly obtained, thereby improving design efficiency and adaptability.
[0086] In a specific embodiment, step S4: analyzing the cooling requirements of each cylinder of the engine based on the first cooling water flow rate, and designing a cooling auxiliary system according to the cooling requirement results, includes:
[0087] Based on the first cooling water flow rate, recalculating the cooling water jacket flow in a steady state to obtain a second heat transfer coefficient of the heat exchange interface between the cooling water jacket and the cylinder body;
[0088] resetting the preset boundary conditions based on the first heat transfer coefficient and the second heat transfer coefficient to analyze the cooling requirements of the engine;
[0089] According to the cooling demand analysis results, the engine cooling parameters are obtained, including: coolant flow rate and heat transfer coefficient of each part of the engine;
[0090] Based on the engine's cooling parameters, determine the cooling areas of various engine parts;
[0091] According to the cooling areas of various parts of the engine, the cooling auxiliary system is designed using simulation software.
[0092] It can be understood that based on the precise cooling demand analysis of the cylinder block at the selected minimum cooling water flow rate, the heat transfer coefficients of various engine parts are obtained through a general steady-state calculation of the engine's cooling water jacket flow, and the heat transfer coefficients of various engine parts and the optimized first heat transfer coefficients of the intake and exhaust manifolds, pistons, and cooling water jacket obtained in step S2 are used as boundary conditions for the steady-state heat transfer calculation of the engine block. For example, parameters such as the coolant inlet temperature, pressure, and flow rate are adjusted. After solving the calculation, the heat transfer carried away by the cooling water jacket from various locations of the cylinder block, the total heat transfer, and the temperatures of the water jacket and the cylinder block at various locations are analyzed to determine the water flow rate and heat transfer coefficient at various locations of the engine. Based on the water flow rate and heat transfer coefficient at various locations of the engine, the cooling areas of various engine parts are clearly defined. For example, the exhaust side of the cylinder head and the nose bridge of the exhaust manifold, which are high-demand areas, require enhanced cooling; medium-demand areas such as the middle of the cylinder block maintain normal cooling; and low-demand areas such as the lower part of the cylinder block require reduced coolant flow. This allows for the subsequent design of the cooling auxiliary system and the rational allocation of cooling resources to ensure that cooling capacity redundancy is avoided in various cooling areas, thereby ensuring efficient operation of the engine.
[0093] Furthermore, the cooling areas of various parts of the engine include at least: a high cooling demand area, a medium cooling demand area and a low cooling demand area;
[0094] Select the auxiliary water pump model based on the calculated additional pressure and flow in the high cooling demand area;
[0095] In the low cooling demand area, a flow throttle valve may be arranged;
[0096] A hierarchical heat sink is used to preferentially direct coolant to high-demand areas; wherein the hierarchical heat sink has multiple independently controlled areas inside to distribute coolant according to the cooling needs of different parts.
[0097] Specifically, an electric auxiliary water pump is added in the high-demand area to increase the coolant flow rate, a throttle valve is installed in the low-demand area to reduce the coolant flow, and a graded heat sink is used to preferentially direct the coolant to the high-demand area. Control strategies are adopted according to each cooling area to achieve precise cooling.
[0098] The following design and control strategies are adopted for different areas: In areas with high cooling demand, the required additional pressure and flow are calculated based on the heat load and coolant flow simulation results of the area. Based on the calculation results, the appropriate auxiliary water pump model is selected. For example, if a high-demand area is calculated to require an additional flow of 10L / min and a pressure of 0.2MPa, an electric auxiliary water pump with a rated flow of 15L / min and a head of 2.5m can be selected. In areas with low cooling demand: a flow throttle valve is arranged to limit the coolant flow by adjusting the valve opening. Multiple independent control areas are set up inside the graded heat sink. The coolant flow direction is controlled by a solenoid valve in each area, and temperature and flow collectors are evenly distributed inside. In application, the coolant is preferentially directed to the high-demand area.
[0099] Furthermore, the pressure and flow data at both ends of the auxiliary water pump are obtained in real time;
[0100] If the pressure and flow data are greater than or equal to the preset threshold and last for a first period of time, an alarm prompt message is output.
[0101] Among them, the preset threshold can be set according to the rated parameters of the auxiliary water pump and the normal working fluctuation range; the first time is set to 15 seconds according to the system response requirements.
[0102] As can be understood, this application can identify engine water pump failures and generate an alarm by real-time monitoring of auxiliary water pump operating data. When the main water pump fails, the backup circulation channel within the graded radiator automatically opens. Combined with the auxiliary water pump's emergency mode, this maintains coolant circulation at the minimum cooling requirement, ensuring the engine can continue to operate safely for a period of time even in a faulty state, effectively improving engine safety. Furthermore, the graded radiator facilitates the development of more detailed cooling strategies, achieving precise cooling of various engine components.
[0103] An engine cooling auxiliary system comprising:
[0104] Cooling circulation loop; the cooling circulation loop can cooperate with other pathways to distribute the coolant flow according to the cooling needs of the engine;
[0105] The cooling circulation loop comprises at least: an auxiliary water pump and a staged heat dissipation box connected in sequence through pipelines;
[0106] The auxiliary water pump is arranged at the oil passage hole of the cylinder head and is connected to the cylinder head water jacket through a first pipe;
[0107] The water outlet of the cylinder head water jacket is connected to the graded heat dissipation box through a second pipe;
[0108] The hierarchical heat dissipation box has a plurality of independent control areas inside, and an electromagnetic control valve is arranged inside each independent control area.
[0109] Specifically, the other passages are main circulation passages, not shown in the figure. The main circulation passages include: a main water pump, a low-pressure water tank, a radiator, an expansion water tank and a cooling water jacket connected in sequence.
[0110] It can be understood that the auxiliary water pump is arranged at the oil channel hole of the cylinder head, which can directly provide additional coolant power to the cylinder head water jacket, enhance the cooling effect of the cylinder head which is a high cooling demand area, prevent the cylinder head from failing due to excessive temperature, and ensure the reliability and stability of key components of the engine; the cooling circulation loop can cooperate with the main circulation path to distribute the coolant flow, and the graded radiator can realize the flow regulation of multiple independent control areas through the electromagnetic control valve, which can accurately distribute coolant according to the cooling needs of different parts of the engine, avoid excessive or insufficient cooling, improve the efficiency of the cooling system, and optimize the overall performance of the engine.
[0111] On the other hand, the present application provides a computer device comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method.
[0112] On the other hand, the present application provides a computer-readable storage medium having a computer program / instruction stored thereon, which implements the steps of the method when the computer program / instruction is executed by a processor.
[0113] On the other hand, the present application provides a computer program product, comprising a computer program / instruction, which implements the steps of the method when executed by a processor.
[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An engine cooling design method, characterized in that: The following steps are involved: S1: Using simulation software to construct an original model, the original model includes: an engine and heat exchange components, the heat exchange components including at least: an intake and exhaust manifold, a piston, a combustion chamber, and a cooling water jacket; S2: Define the heat transfer area, import the constructed original model data into the fluid simulation software, and use the fluid simulation software to calculate the first heat transfer coefficient and temperature field characteristics of the heat exchange component based on the preset boundary conditions and design goals; S3: Based on the first heat transfer coefficient and temperature field characteristics, combined with the structural parameters of the heat exchange component, the heat transfer capacity of each position of the cylinder is compared and analyzed using fluid simulation software, and the first cooling water flow rate of the engine is output; S4: Based on the first cooling water flow rate, analyzing the cooling requirements of each cylinder of the engine, and designing a cooling auxiliary system according to the cooling requirement results.
2. The method according to claim 1, characterized in that Step S2 specifically includes: Set transient boundary conditions and use a dynamic mesh model to simulate the intake and exhaust system and piston motion to obtain the first heat transfer coefficient of the intake and exhaust manifold and piston. Set steady-state boundary conditions and obtain the first heat transfer coefficient of the cooling water jacket; Using the solver, determine whether the first heat transfer coefficients of the intake and exhaust manifolds, pistons, and cooling water jackets are all within the theoretical range; If the first heat transfer coefficient falls within the theoretical range, the first heat transfer coefficients of the intake and exhaust manifolds, the piston, and the cooling water jacket are output; If the first heat transfer coefficient does not fall within the theoretical range, the solver and the preset boundary conditions are adjusted until the adjusted first heat transfer coefficient falls within the theoretical range, and the adjusted first heat transfer coefficient is output.
3. The method according to claim 2, characterized in that Step S3 specifically includes: Setting a contact interface between the cooling water jacket and the engine; the contact interface at least includes: a solid-liquid contact interface and a solid-solid contact interface; The heat transfer of each contact interface is calculated by thermo-solid conjugate solver analysis and the total heat transfer of the contact interface is obtained by summing up. According to the comparison result of the total heat exchange amount of each contact interface and the total heat exchange amount required by the engine, a first cooling water flow rate of the engine is output.
4. The method according to claim 3, characterized in that Outputting a first cooling water flow rate of the engine according to a comparison result of the total heat exchange of each contact interface with the total heat exchange required by the engine specifically includes: If the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, the first cooling water flow rate of the engine is output; If the total heat exchange of each contact interface is less than the total heat exchange required by the engine, the first cooling water flow rate is adjusted and recalculated until the total heat exchange of each contact interface is greater than the total heat exchange required by the engine, and the adjusted first cooling water flow rate is output.
5. The method according to claim 4, characterized in that Step S4 includes: Based on the first cooling water flow rate, recalculating the cooling water jacket flow in a steady state to obtain a second heat transfer coefficient of the heat exchange interface between the cooling water jacket and the cylinder body; resetting the preset boundary conditions based on the first heat transfer coefficient and the second heat transfer coefficient to analyze the cooling requirements of the engine; According to the cooling demand analysis results, the engine cooling parameters are obtained, including: coolant flow rate and heat transfer coefficient of each part of the engine; Based on the engine's cooling parameters, determine the cooling areas of various engine parts; According to the cooling areas of various parts of the engine, the cooling auxiliary system is designed using simulation software.
6. The method according to claim 5, characterized in that The cooling areas of various parts of the engine include at least: a high cooling demand area, a medium cooling demand area and a low cooling demand area; Select the auxiliary water pump model based on the calculated additional pressure and flow in the high cooling demand area; In the low cooling demand area, a flow throttle valve may be arranged; A hierarchical heat sink is used to preferentially direct coolant to high-demand areas; wherein the hierarchical heat sink has multiple independently controlled areas inside to distribute coolant according to the cooling needs of different parts.
7. An engine cooling auxiliary system, characterized in that: The method according to any one of claims 1 to 6, wherein the engine cooling auxiliary system comprises: Cooling circulation loop; the cooling circulation loop can cooperate with other pathways to distribute the coolant flow according to the cooling needs of the engine; The cooling circulation loop comprises at least: an auxiliary water pump and a staged heat dissipation box connected in sequence through pipelines; The auxiliary water pump is arranged at the oil passage hole of the cylinder head and is connected to the cylinder head water jacket through a first pipe; The water outlet of the cylinder head water jacket is connected to the graded heat dissipation box through a second pipe; The hierarchical heat dissipation box has a plurality of independent control areas inside, and an electromagnetic control valve is arranged inside each independent control area.
8. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.
9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.
10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.