Optimization design method and system for water-inflow-preventing rain cap of vehicle air conditioner opening

Abstract

The invention discloses an optimal design method and system for a water-inflow-preventing rain hat of a vehicle air conditioner opening, and relates to the technical field of vehicle simulation. Aiming at the water inflow problem of the air conditioner opening, the method is a gas-liquid coupling design method based on Euler method flow field analysis and an SPH particle method, and takes air and rainwater into consideration at the same time; the air inflow and structural strength requirements of the air conditioner opening are considered, the air conditioner opening waterproof rain cap is designed through simulation analysis, the strict air conditioner opening water inflow requirement is met, and the actual vehicle using experience of customers can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle simulation, and particularly to an optimized design method and system for a rain cap for preventing water ingress into a vehicle air conditioner outlet. Background Art

[0002] Automobile water management development is a development of research on the water ingress prevention performance of automobiles under conditions such as rain, car wash, wading, rain and fog. Automobile water management is a key index for automobile performance development and is also one of the most perceptible performances for customers.

[0003] In order to prevent water from entering the air conditioner outlet, it is required that the Y-direction distance between the designed air conditioner outlet and the opening of the wiper cover plate is ≥ 300 mm. At the same time, there are still gaps in the lap joints of multiple parts on both sides for water to flow into the vicinity of the air conditioner outlet. The water intake requirement of the air conditioner outlet filter element is very strict. In order to meet the strict water ingress requirement of the air conditioner outlet (≤ 20 g / 20 min rain), it is necessary to design a water ingress prevention device above the air conditioner outlet to avoid water ingress.

[0004] The traditional Euler-based fluid simulation analysis method requires mesh generation, which has a long cycle, is prone to divergence, and simplifies narrow and small gaps, resulting in an obviously small simulation result of the water intake of the air conditioner outlet, and the simulation analysis cycle is long and cannot support the development of project nodes; in recent years, the popular SPH particle method has been used for water management analysis, which does not require mesh generation, can retain any gap, has a short cycle and high efficiency, and is suitable for the inspection of parts in most rain scenarios; the risk of water intake occurs when the blower is turned on at the air conditioner outlet. However, the disadvantage of the SPH design method is that it is a single-phase flow of liquid, which can simulate the stationary state of the vehicle, but cannot directly simulate the flow of the air flow field, so it cannot directly simulate the influence of the maximum gear opening of the blower on the surrounding flow field, and cannot effectively solve the problem of water ingress into the air conditioner outlet. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an optimized design method and system for a rain cap for preventing water ingress into a vehicle air conditioner outlet to solve the above problems recorded in the background art.

[0006] One aspect of the present invention provides an optimized design method for a rain cap for preventing water ingress into a vehicle air conditioner outlet, the method comprising:

[0007] Obtaining a whole vehicle model of a vehicle to be optimized in design, simplifying the whole vehicle model, and selecting a part of the model therefrom to obtain a blower flow field model;

[0008] Processing the blower flow field model using grid software to establish a blower flow field grid model;

[0009] Performing a steady-state CFD calculation on the blower flow field model according to preset calculation boundary conditions to simulate and analyze the blower flow field;

[0010] Obtain the calculation results of the CFD calculation and extract the air flow field results when the blower is turned on;

[0011] Export the vehicle model to the stl format and import the stl format model into the water management SPH software;

[0012] Import the air flow field results into the water management SPH software, simulate and analyze the rain condition based on the SPH method, and calculate the water inflow at the air conditioner inlet;

[0013] Judge whether the water inflow at the air conditioner inlet meets the preset water inlet requirement of the air conditioner inlet;

[0014] If so, conduct air intake verification and rain cap structure strength verification on the rain cap data that meets the water inlet requirement of the air conditioner inlet;

[0015] Freeze the rain cap data that simultaneously meets the water inlet requirement of the air conditioner inlet, meets the air intake requirement and meets the structural strength requirement to obtain the optimization plan of the water-proof rain cap.

[0016] According to one aspect of the above technical solution, the step of importing the air flow field results into the water management SPH software and simulating and analyzing the rain condition based on the SPH method to calculate the water inflow at the air conditioner inlet includes:

[0017] Import the air flow field results into the water management SPH software and set the wiper movement, including setting the movement angle range and movement period of the wiper;

[0018] According to the preset movement angle range and movement period, conduct rain simulation analysis based on the SPH method, control the movement of the wiper, and complete the transient simulation;

[0019] According to the transient simulation results, obtain the rainwater flow monitoring curve, and determine the water inflow at the air conditioner inlet according to the rainwater flow monitoring curve.

[0020] According to one aspect of the above technical solution, the rain simulation analysis based on the SPH method includes the rain condition of the air conditioner waterproof rain cap, and the simulation analysis process includes:

[0021] If the air conditioner water inflow meets the target requirement of ≤20g, it is determined that the design of the air conditioner meets the requirement;

[0022] If the air conditioner water inflow does not meet the target requirement of ≤20g, it is determined that the design of the air conditioner does not meet the requirement. Through the water flow path, find the leakage location, and re-conduct the blower air flow field and SPH rain simulation analysis work according to the optimized waterproof rain cap structure design;

[0023] If the water inflow of the air conditioner still does not meet the target requirement of ≤20g, continue through the water flow path to find the leakage location, optimize the structure of the rain cap at the air conditioner outlet again, and re - conduct the blower air flow field and SPH rain simulation analysis according to the optimized waterproof rain cap structure;

[0024] Until the water inflow of the air conditioner meets the target requirement of ≤20g, it is determined that the design of the air conditioner meets the requirements, and it is allowed to check the air intake volume and structural strength of the rain cap data.

[0025] According to one aspect of the above - mentioned technical solution, the time of the transient simulation is 2min. The water inflow at the air conditioner outlet is calculated between 15s - 2min, and the water inflow at the air conditioner outlet for 20min is estimated.

[0026] According to one aspect of the above - mentioned technical solution, in the step of performing a steady - state CFD calculation on the blower flow field model according to the preset calculation boundary conditions to simulate and analyze the blower flow field, the calculation boundary conditions include:

[0027] The HVAC outlet of the calculation domain is a negative - flow inlet, and the inlet flow is the air flow at the maximum blower speed.

[0028] The outlet of the calculation domain is a pressure outlet, and the pressure outlet is set to 0pa.

[0029] According to one aspect of the above - mentioned technical solution, the step of performing a steady - state CFD calculation on the blower flow field model to simulate and analyze the blower flow field includes:

[0030] Apply fluid software and use the Euler method to perform a steady - state CFD calculation on the blower flow field model to simulate and analyze the blower flow field.

[0031] According to one aspect of the above - mentioned technical solution, the obtained air flow field results when the blower is turned on include the pressure and speed when the blower is turned on.

[0032] Another aspect of the present invention is to provide a system for optimizing the design of a rain cap for preventing water from entering the vehicle air conditioner outlet. The system is applied to the method described in the above - mentioned technical solution, and the system includes:

[0033] A model acquisition module, used to acquire the vehicle model of the vehicle to be optimized in design, simplify the vehicle model, and select a part of the model to obtain a blower flow field model;

[0034] A model processing module, used to process the blower flow field model using grid software to establish a blower flow field grid model;

[0035] A flow field simulation module, used to perform a steady - state CFD calculation on the blower flow field model according to the preset calculation boundary conditions to simulate and analyze the blower flow field;

[0036] A flow field extraction module, configured to obtain the calculation results of the CFD calculation and extract the air flow field results when the blower is turned on;

[0037] A model import module, configured to export the vehicle model in stl format and import the stl format model into the water management SPH software;

[0038] A simulation calculation module, configured to import the air flow field results into the water management SPH software, simulate and analyze the rain shower condition based on the SPH method, and calculate the water inflow at the air conditioner inlet;

[0039] A judgment module, configured to judge whether the water inflow at the air conditioner inlet meets the preset water inlet requirement for the air conditioner inlet;

[0040] A checking module, configured to, when the judgment module determines that the water inflow at the air conditioner inlet meets the preset water inlet requirement for the air conditioner inlet, perform air intake checking and rain cap structure strength checking on the rain cap data that meets the water inlet requirement for the air conditioner inlet;

[0041] A data freezing module, configured to freeze the rain cap data that simultaneously meets the water inlet requirement for the air conditioner inlet, the air intake requirement, and the structure strength requirement, to obtain an optimized solution for the rain cap that prevents water from entering.

[0042] Compared with the prior art, by using the method and system for optimizing the design of the rain cap for preventing water from entering the vehicle air conditioner inlet shown in the present invention, the beneficial effects are as follows:

[0043] The method shown in this embodiment obtains the vehicle model of the vehicle to be optimized in design, simplifies the vehicle model, selects some of the models therein to obtain the blower flow field model; uses grid software to process the blower flow field model to establish a blower flow field grid model; according to the pre-set calculation boundary conditions, performs steady-state CFD calculation on the blower flow field model to simulate and analyze the blower flow field; obtains the calculation results of the CFD calculation, extracts the air flow field results when the blower is turned on; exports the vehicle model in stl format and imports the stl format model into the water management SPH software; imports the air flow field results into the water management SPH software, and based on the SPH method, simulates and analyzes the rain condition to calculate the water inflow at the air conditioner outlet; determines whether the water inflow at the air conditioner outlet meets the pre-set water inlet requirement for the air conditioner outlet; if so, performs air intake check and rain cap structure strength check on the rain cap data that meets the water inlet requirement for the air conditioner outlet; freezes the rain cap data that simultaneously meets the water inlet requirement for the air conditioner outlet, meets the air intake requirement and meets the structural strength requirement to obtain the optimization plan for the rain cap that prevents water from entering. In summary, the method shown in this embodiment aims at the problem of water entering the air conditioner outlet, and based on the Eulerian method flow field analysis and the gas-liquid coupling design method of the SPH particle method, takes into account both air and rainwater, and takes into account the air intake volume and structural strength requirements of the air conditioner outlet. Through simulation analysis, a rain cap that prevents water from entering the air conditioner outlet is designed, which meets the strict water inlet requirement for the air conditioner outlet and can effectively improve the actual vehicle use experience of end customers. Brief Description of the Drawings

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and easier to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0045] Figure 1 It is a schematic flow chart of the method for optimizing the design of the rain cap for preventing water from entering the vehicle air conditioner outlet in an embodiment of the present invention;

[0046] Figure 2 It is a schematic structural diagram of the system for optimizing the design of the rain cap for preventing water from entering the vehicle air conditioner outlet in an embodiment of the present invention. Detailed Embodiments

[0047] In order to make the objectives, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0049] Embodiment 1

[0050] The first embodiment of the present invention provides an optimized design method for a rain cap to prevent water from entering a vehicle air-conditioning outlet, aiming to optimize the design of the rain cap for preventing water from entering the vehicle air-conditioning outlet. Specifically, a design method based on virtual simulation digital technology for the external flow field of the air-conditioning blower and rain analysis based on the SPH particle method is provided in the design and research and development stage. Through the method shown in this embodiment, a rain cap that meets the requirements for water entry into the air-conditioning outlet under rain conditions is designed to improve the actual vehicle use experience of customers.

[0051] First of all, it should be noted that in the engineering development stage, the main development requirement for the rain cap to prevent water from entering the air-conditioning outlet is to meet the waterproof requirement of the air-conditioning outlet, and at the same time, it is necessary to take into account meeting the air intake requirement of the air-conditioning outlet and meeting the structural strength requirement. In this embodiment, based on the air flow field analysis of the blower based on the results of fluid mechanics, and then based on the SPH particle method for liquid flow field rain analysis, the basic analysis result of the water inflow volume at the air-conditioning outlet is obtained, the appropriate position of the water inlet is found, and a water prevention device for the air-conditioning outlet, that is, a rain cap, is designed; plus the rain cap structure, and the air flow field analysis of the blower and the rain analysis based on the SPH particle method are carried out to further obtain the water inflow volume result of the air-conditioning outlet with a water prevention structure. If it does not meet the design requirements, multiple cycles of optimization are carried out until the water inflow volume requirement of the air-conditioning outlet is met. At the same time, the rain cap needs to take into account the air intake requirement of the air-conditioning outlet and the structural strength requirement.

[0052] In addition, in this embodiment, the water entry path of the air-conditioning outlet is also described to help understanding. Among them, the risk of water entry into the air-conditioning outlet comes from the opening of the wiper cover plate and the narrow side gaps:

[0053] 1. Narrow side gaps: There are multiple components on the left and right sides of the fender, the front windshield and the wiper cover plate that need to be matched and lapped. Affected by engineering and manufacturing processes, there are generally narrow gaps within 2 mm in vehicles on the market;

[0054] 2. Opening of the wiper cover plate: Air intake requirement of the air-conditioning outlet

[0055] Rainwater falls from the outside of the vehicle and enters the water guide trough and near the air conditioner inlet through the openings and narrow gaps in the wiper cover plate. When the blower is turned on, the flow rate near the air conditioner inlet is high, and the rainwater is sucked into the air conditioner inlet. The blower has multiple switch gears, from the lowest gear to the highest gear. The greater the air flow rate near the air conditioner inlet, the greater the risk of rainwater from the wiper cover plate and narrow gaps being sucked into the air conditioner inlet. The amount of water that the air conditioner filter element allows to be inhaled is 20 g / 20 min (under the condition of a rainfall of 10 mm / min, at the highest gear). If the amount of water is greater than this, it will affect the performance of the air conditioner filter element, and serious water will directly flow into the cab, causing water to enter the vehicle.

[0056] Please refer to Figure 1 , the method described in this embodiment includes steps S10 - step S90:

[0057] Step S10, obtain the whole vehicle model of the vehicle to be optimized in design, simplify the whole vehicle model, select some of the models therein, and obtain the blower flow field model.

[0058] The purpose of this embodiment is to simulate and analyze the water intake amount of rainwater inhaled into the air conditioner inlet and the rainwater flow path during the process of rainwater passing through the wiper cover plate along the front windshield and entering the water guide trough. Therefore, in order to save time, the whole vehicle model of the vehicle to be optimized in design is simplified to a certain extent, and necessary components are selected to obtain the blower flow field model, including: the inner and outer panels of the engine hood, fenders, front windshield, front side glass, roof, rearview mirror, front door, wiper, wiper cover plate, water guide trough, air chamber, HVAC, etc.

[0059] Step S20, use grid software to process the blower flow field model and establish a blower flow field grid model.

[0060] Specifically, use CAE grid software to perform pre-processing grid modeling on the blower flow field model. In order to retain important details and ensure a more accurate blower flow field, the unit size of the small holes on the wiper cover plate is set at 0.5 - 1 mm; the other models of the whole vehicle are meshed according to the standard of flow field simulation analysis, with a mesh size of 2 - 16 mm; all nas meshes are exported.

[0061] Import the nas mesh into the fluid analysis software and manually create a Box (as the pressure outlet): The Box needs to include the surrounding components affected by the flow field after the blower is turned on, the front windshield, fenders, wiper cover plate, water guide trough, and HVAC. The Z - direction height can reach half of the fender. Use the mesh enclosed by the Box as the analysis model, and cut off the mesh outside the Box to establish the whole vehicle aerodynamic model, that is, the blower flow field grid model.

[0062] Step S30, according to the pre - set calculation boundary conditions, perform steady - state CFD calculations on the blower flow field model to simulate and analyze the blower flow field.

[0063] Among them, calculation boundary conditions are set, including: the HVAC outlet of the calculation domain is a negative flow inlet, and the inlet flow rate is the air flow rate at the maximum blower speed; the outlet of the calculation domain is a pressure outlet, and the pressure outlet is set to 0 Pa.

[0064] Furthermore, in this embodiment, the fluid software Star-ccm+ is applied, and the Euler method is used to perform steady-state CFD calculation on the blower flow field model.

[0065] Step S40: Obtain the calculation results of the CFD calculation and extract the air flow field results when the blower is turned on.

[0066] Among them, after the calculation by Star-ccm+, the aerodynamic results when the blower is turned on are obtained, including pressure, velocity, etc.; for the simulation analysis involved in the method shown in this embodiment, only the velocity flow field results need to be extracted.

[0067] Specifically, after the calculation of the flow field in Star-ccm+ is completed, use File->Export, select EnsightGold Files, select the calculation domain and the velocity in each direction, and export the external flow field data to files such as.case / .geo / ..Velocity.

[0068] Step S50: Export the vehicle model in stl format and import the stl format model into the water management SPH software.

[0069] Specifically, directly export the CATIA model in stl format by large component units (such as fenders, hoods), and then import the stl format model into the water management SPH software. There is no need to generate grids again, and the vehicle model does not need any simplification. The following is a detailed description of the settings:

[0070] Material properties: Set the material surface parameters, mainly roughness and adhesion properties, which characterize the adhesion between the wall surface and rainwater. The specific values depend on the material, and most of them are roughness: 1, adhesion: 0.63.

[0071] Boundary conditions: Set according to the boundary of the rain chamber in the test site. The inlet is the rain intensity directly above the roof (2.5 m from the ground), and the outlet is the ground.

[0072] Rain scenario: When the vehicle is idling, the windshield wipers are turned on, the air conditioner is in the external circulation mode, and the flow field is under the maximum blower speed. The rain lasts for 20 minutes; the rainfall at the top is 10 mm / min; the particle size is set to vary from 0.5 to 2 mm; the HVAC flow monitoring is synchronously set.

[0073] Step S60: Import the air flow field result into the water management SPH software, and perform simulation analysis on the rain shower condition based on the SPH method to calculate the water inflow at the air conditioner inlet.

[0074] Specifically, since the SPH software cannot calculate the flow field, it is necessary to import the flow field from the outside. Import the air velocity flow field calculated by Star-ccm into the SPH software.

[0075] Then, set the movement of the windshield wiper. The movement trajectory is input through the dynamics software or defined manually. In this embodiment, the manual input method is adopted. Define the three associated coordinate systems of the wiper blade, the support rod, and the swing arm. Adjust the windshield wiper to the maximum swing frequency gear, record the cycle time with a stopwatch, and at the same time record the starting position and angle of the wiper blade by video. Then, adjust the relative positions of the support rod and the swing arm frame by frame to ensure that the wiper blade is always in contact with the arc-shaped glass surface.

[0076] Then, perform rain shower simulation analysis based on the SPH method: Rainwater falls from the outside of the vehicle, and the windshield wiper moves according to the movement law, which is a transient simulation analysis related to time.

[0077] Then, after the transient simulation analysis is completed, obtain the water inflow at the air conditioner inlet through the rainwater flow monitoring curve. Since the transient calculation is very time-consuming, to save the project cycle, generally, the simulation calculation for 2 minutes is sufficient. This is because the rain is stable after 15 seconds, and the water inflow at the air conditioner inlet between 15 seconds (taking the time after stabilization, which can also be other times) and 2 minutes can be obtained, and then the water inflow for 20 minutes can be deduced from this.

[0078] Step S70: Determine whether the water inflow at the air conditioner inlet meets the preset water inlet requirement for the air conditioner.

[0079] Among them, the rain shower simulation analysis based on the SPH method includes the rain shower condition of the air conditioner waterproof rain cap, and the simulation analysis process includes:

[0080] If the water inflow into the air conditioner meets the target requirement of ≤20g, it is determined that the design of the air conditioner meets the requirement;

[0081] If the water inflow into the air conditioner does not meet the target requirement of ≤20g, it is determined that the design of the air conditioner does not meet the requirement. Through the water flow path, find the leakage location, and re-perform the blower air flow field and SPH rain shower simulation analysis work according to the optimized waterproof rain cap structure design;

[0082] If the water inflow into the air conditioner still does not meet the target requirement of ≤20g, continue to find the leakage location through the water flow path, optimize the structure of the air conditioner inlet rain cap again, and re-perform the blower air flow field and SPH rain shower simulation analysis work according to the optimized waterproof rain cap structure design;

[0083] Until the water inflow of the air conditioner meets the target requirement of ≤20 g, it is determined that the design of the air conditioner meets the requirements, and it is allowed to check the air intake volume and structural strength of the rain cap data.

[0084] In this embodiment, if it is determined that the water inflow of the air conditioner inlet is ≤20 g, it indicates that the preset water inlet requirement of the air conditioner inlet is met, and the method shown in this embodiment enters step S80.

[0085] Step S80: Check the air intake of the air conditioner and the structural strength of the rain cap with the rain cap data that meets the water inlet requirement of the air conditioner inlet.

[0086] Step S90: Freeze the rain cap data that simultaneously meets the water inlet requirement of the air conditioner inlet, the air intake requirement, and the structural strength requirement to obtain an optimized solution for the water-proof rain cap.

[0087] Freeze the rain cap data that meets the water inlet requirement of the air conditioner inlet, the air intake requirement, and the structural strength requirement, so as to obtain an optimized solution for the rain cap structure.

[0088] The above optimized design method for the water-proof rain cap of the vehicle air conditioner inlet based on fluid coupling simulation obtains a rain cap that meets the water inlet requirement of the air conditioner inlet by solving the air and rain water performance during the rain development process of the air conditioner performance.

[0089] Adopting the optimized design method for the water-proof rain cap of the vehicle air conditioner inlet shown in this embodiment, the beneficial effects are as follows:

[0090] The method shown in this embodiment obtains the vehicle model of the vehicle to be optimized in design, simplifies the vehicle model, selects some of the models therein to obtain the blower flow field model; uses grid software to process the blower flow field model to establish a blower flow field grid model; according to the pre-set calculation boundary conditions, performs steady-state CFD calculation on the blower flow field model to simulate and analyze the blower flow field; obtains the calculation results of the CFD calculation, extracts the air flow field results when the blower is turned on; exports the vehicle model in stl format and imports the stl format model into the water management SPH software; imports the air flow field results into the water management SPH software, simulates and analyzes the rain condition based on the SPH method, and calculates the water inflow at the air conditioner inlet; determines whether the water inflow at the air conditioner inlet meets the pre-set water inlet requirement for the air conditioner inlet; if so, performs air intake check and rain cap structure strength check on the rain cap data that meets the water inlet requirement for the air conditioner inlet; freezes the rain cap data that simultaneously meets the water inlet requirement for the air conditioner inlet, meets the air intake requirement, and meets the structure strength requirement to obtain the optimization plan for the water-proof rain cap. In summary, the method shown in this embodiment aims at the problem of water inlet at the air conditioner inlet, and is based on the gas-liquid coupling design method of Euler method flow field analysis and SPH particle method, taking into account both air and rain, and considering both the air intake volume and the structure strength requirement at the air conditioner inlet. Through simulation analysis, a water-proof rain cap for the air conditioner inlet is designed to meet the strict water inlet requirement for the air conditioner inlet, and can effectively improve the actual vehicle use experience of end customers.

[0091] Embodiment 2

[0092] Please refer to Figure 2 , the second embodiment of the present invention provides a system for optimizing the design of a water-proof rain cap for a vehicle air conditioner inlet. The system is applied to the method described in the above embodiment. The system includes:

[0093] A model acquisition module 10, configured to obtain the vehicle model of the vehicle to be optimized in design, simplify the vehicle model, select some of the models therein to obtain the blower flow field model;

[0094] A model processing module 20, configured to use grid software to process the blower flow field model to establish a blower flow field grid model;

[0095] A flow field simulation module 30, configured to perform steady-state CFD calculation on the blower flow field model according to the pre-set calculation boundary conditions to simulate and analyze the blower flow field;

[0096] A flow field extraction module 40, configured to obtain the calculation results of the CFD calculation and extract the air flow field results when the blower is turned on;

[0097] A model import module 50, configured to export the vehicle model in stl format and import the stl format model into the water management SPH software;

[0098] The simulation calculation module 60 is used to import the air flow field result into the water management SPH software, simulate and analyze the rain condition based on the SPH method, and calculate the water inflow at the air conditioner outlet;

[0099] The judgment module 70 is used to judge whether the water inflow at the air conditioner outlet meets the preset water inlet requirement of the air conditioner outlet;

[0100] The verification module 80 is used to, when the judgment module determines that the water inflow at the air conditioner outlet meets the preset water inlet requirement of the air conditioner outlet, conduct air intake verification of the rain cap data meeting the water inlet requirement of the air conditioner outlet and structural strength verification of the rain cap structure;

[0101] The data freezing module 90 is used to freeze the rain cap data that simultaneously meets the water inlet requirement of the air conditioner outlet, the air intake requirement, and the structural strength requirement, and obtain an optimized solution for the water - proof rain cap.

[0102] Adopting the vehicle air - conditioner outlet water - proof rain cap optimization design system shown in this embodiment, the beneficial effects are as follows:

[0103] The system shown in this embodiment obtains the vehicle model of the vehicle to be optimized in design, simplifies the vehicle model, selects some of the models to obtain the blower flow field model; uses grid software to process the blower flow field model to establish a blower flow field grid model; according to the preset calculation boundary conditions, conducts steady - state CFD calculation on the blower flow field model to simulate and analyze the blower flow field; obtains the calculation result of the CFD calculation, extracts the air flow field result when the blower is turned on; exports the vehicle model in stl format and imports the stl - format model into the water management SPH software; imports the air flow field result into the water management SPH software, simulates and analyzes the rain condition based on the SPH method, and calculates the water inflow at the air conditioner outlet; judges whether the water inflow at the air conditioner outlet meets the preset water inlet requirement of the air conditioner outlet; if so, conducts air intake verification of the rain cap data meeting the water inlet requirement of the air conditioner outlet and structural strength verification of the rain cap structure; freezes the rain cap data that simultaneously meets the water inlet requirement of the air conditioner outlet, the air intake requirement, and the structural strength requirement, and obtains an optimized solution for the water - proof rain cap. In summary, the system shown in this embodiment aims at the problem of water inlet at the air conditioner outlet, and based on the Euler - method flow field analysis and the air - liquid coupling design method of the SPH particle method, takes into account both air and rainwater, and also takes into account the air intake volume and structural strength requirements at the air conditioner outlet. Through simulation analysis, a water - proof rain cap for the air conditioner outlet is designed, which meets the strict water inlet requirement of the air conditioner outlet and can effectively improve the actual vehicle - using experience of end - users.

[0104] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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.

[0105] The above-described embodiments merely represent several implementation manners of the present invention. The descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent for 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 for the present invention shall be subject to the appended claims.

Claims

1. An optimized design method for a rain cap to prevent water from entering a vehicle air-conditioning outlet, characterized in that, The method includes: Obtain the vehicle model of the vehicle to be optimized in design, simplify the vehicle model, select some of the models therein to obtain the blower flow field model; Use grid software to process the blower flow field model to establish a blower flow field grid model; According to the pre-set calculation boundary conditions, perform steady-state CFD calculation on the blower flow field model to simulate and analyze the blower flow field; Obtain the calculation results of the CFD calculation and extract the air flow field results when the blower is turned on; Export the vehicle model in stl format and import the stl format model into the water management SPH software; Import the air flow field results into the water management SPH software, simulate and analyze the rain condition based on the SPH method, and calculate the water inflow at the air conditioner inlet; Judge whether the water inflow at the air conditioner inlet meets the pre-set water inlet requirement for the air conditioner inlet; If so, perform air intake check and rain cap structure strength check on the rain cap data that meets the water inlet requirement for the air conditioner inlet; Freeze the rain cap data that simultaneously meets the water inlet requirement for the air conditioner inlet, meets the air intake requirement, and meets the structural strength requirement to obtain the optimized scheme for the water-proof rain cap.

2. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 1, characterized in that, The step of importing the air flow field results into the water management SPH software, simulating and analyzing the rain condition based on the SPH method, and calculating the water inflow at the air conditioner inlet includes: Import the air flow field results into the water management SPH software, and set the wiper movement, including setting the movement angle range and movement period of the wiper; According to the pre-set movement angle range and movement period, perform rain simulation analysis based on the SPH method, control the wiper to move, and complete the transient simulation; According to the transient simulation results, obtain the rainwater flow monitoring curve, and determine the water inflow at the air conditioner inlet according to the rainwater flow monitoring curve.

3. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 2, characterized in that, Performing rain simulation analysis based on the SPH method includes the rain condition of the air conditioner water-proof rain cap, and the simulation analysis process includes: If the air conditioner water inflow meets the target requirement of ≤20 g, it is determined that the design of the air conditioner meets the requirement; If the air conditioner water inflow does not meet the target requirement of ≤20 g, it is determined that the design of the air conditioner does not meet the requirement. Through the water flow path, find the water leakage position, and re-perform the blower air flow field and SPH rain simulation analysis work according to the optimized water-proof rain cap structure of the design; If the air conditioner water inflow still does not meet the target requirement of ≤20 g, continue to find the water leakage position through the water flow path, optimize the rain cap structure at the air conditioner inlet again, and re-perform the blower air flow field and SPH rain simulation analysis work according to the optimized water-proof rain cap structure of the design; Until the air conditioner water inflow meets the target requirement of ≤20 g, it is determined that the design of the air conditioner meets the requirement, and the air intake and structural strength check of the rain cap data are allowed.

4. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 2, characterized in that, The time of the transient simulation is 2 min. The water inflow at the air conditioner inlet is simulated and calculated between 15 s and 2 min, and the water inflow at the air conditioner inlet for 20 min is estimated.

5. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 1, wherein, In the step of performing steady-state CFD calculation on the blower flow field model according to the pre-set calculation boundary conditions to simulate and analyze the blower flow field, the calculation boundary conditions include: The HVAC outlet of the calculation domain is a negative flow inlet, and the inlet flow is the air flow at the maximum blower speed; The outlet of the computational domain is a pressure outlet, and the pressure outlet is set to 0 Pa.

6. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 5, characterized in that, The steps for performing steady-state CFD calculations on the blower flow field model to simulate and analyze the blower flow field include: Apply fluid software and use the Euler method to perform steady-state CFD calculations on the blower flow field model to simulate and analyze the blower flow field.

7. The optimized design method of the rain cap for preventing water ingress into the vehicle air outlet according to claim 6, characterized in that, The obtained air flow field results with the blower turned on include the pressure and velocity with the blower turned on.

8. An optimized design system for a rain cap to prevent water ingress into a vehicle air conditioning vent, characterized in that, The system is applied to the method according to any one of claims 1-7, and the system includes: A model acquisition module for acquiring a vehicle model of a vehicle to be optimized and designed, simplifying the vehicle model, and selecting a partial model therefrom to obtain a blower flow field model; A model processing module for processing the blower flow field model using grid software to establish a blower flow field grid model; A flow field simulation module for performing steady-state CFD calculations on the blower flow field model according to pre-set calculation boundary conditions to simulate and analyze the blower flow field; A flow field extraction module for obtaining the calculation results of the CFD calculations and extracting the air flow field results with the blower turned on; A model import module for exporting the vehicle model in stl format and importing the stl format model into the water management SPH software; A simulation calculation module for importing the air flow field results into the water management SPH software, simulating and analyzing the rain shower condition based on the SPH method, and calculating the water inflow at the air conditioner inlet; A judgment module for judging whether the water inflow at the air conditioner inlet meets the pre-set water inlet requirement for the air conditioner inlet; A verification module for, when the judgment module determines that the water inflow at the air conditioner inlet meets the pre-set water inlet requirement for the air conditioner inlet, performing air intake verification of the rain cap data meeting the water inlet requirement for the air conditioner inlet and verification of the rain cap structure strength; A data freezing module for freezing the rain cap data that simultaneously meets the water inlet requirement for the air conditioner inlet, the air intake requirement, and the structure strength requirement to obtain an optimized solution for the water-proof rain cap.

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