A system and vehicle capable of actively suppressing wind buffeting noise of automobile windows

Abstract

This invention discloses a system and vehicle for actively suppressing wind vibration noise from vehicle windows. The system includes a window glass and a sunshade curtain system that can adjust the mesh diameter and porosity parameters of the sunshade curtain fabric in real time based on the window opening value. The window opening value is determined based on the actual position and the calibrated position of the vehicle window glass. The mesh diameter and porosity parameters of the sunshade curtain system are obtained based on the window opening value. The sunshade curtain system adjusts the sunshade curtain fabric based on these parameters. This invention can achieve a better reduction in wind vibration noise by adjusting the mesh diameter and porosity of the sunshade curtain fabric in real time to match the flow field characteristics under various window openings.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a system and vehicle for actively suppressing wind noise from automobile windows. Background Technology

[0002] Wind noise from open car windows has always been a significant issue affecting user comfort. This low-frequency, high-sound-pressure noise not only causes discomfort for occupants but also poses potential health risks with prolonged exposure, ultimately jeopardizing driving safety. Since opening car windows is an unavoidable daily activity during actual driving, effectively suppressing wind noise has become a pressing technical challenge in automotive development.

[0003] Currently, the industry has proposed three main solutions to the problem of wind vibration in vehicle windows. The first technical solution is to install deflectors on the vehicle body surface. However, due to the limitations of the overall vehicle styling requirements, the size of the deflectors is difficult to meet the aerodynamic optimization needs, affecting both the vehicle's appearance and failing to achieve the desired noise reduction effect. The second technical solution is to place a spoiler mesh at the window glass. However, since the characteristic opening size of the spoiler mesh is fixed, its flow resistance model cannot be dynamically adjusted according to the flow field characteristics under different window opening degrees, making it difficult to achieve wind vibration suppression under all operating conditions. The third technical solution is to optimize wind vibration performance by adjusting the window opening combination and opening degree. Although this solution can improve the wind vibration problem in some cases, it not only restricts the user's freedom of window opening, violating the original design intention of ease of use, but also fails to effectively solve the wind vibration problem when the rear window is fully open.

[0004] In summary, there is an urgent need to develop a solution to the wind vibration problem caused by opening car windows while the car is in motion. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sunshade curtain control system that addresses the deficiencies in the prior art. This system can adjust the mesh diameter and porosity of the sunshade curtain fabric in real time to match the flow field characteristics under different window openings, thereby achieving a better effect in improving wind noise from the windows.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: This invention provides a system that can actively suppress wind vibration noise of automobile windows, including a window glass and a window sunshade system that can adjust the mesh diameter and porosity parameters of the window sunshade curtain fabric in real time based on the window opening value. The opening value of the vehicle window glass is determined based on the actual position of the vehicle window glass and the calibrated position of the vehicle window glass; the mesh diameter and porosity parameters of the window sunshade system are obtained based on the window opening value; the window sunshade system adjusts the window sunshade curtain fabric based on the mesh diameter and porosity parameters.

[0007] In a preferred embodiment of the present invention, the vehicle window sunshade system includes a vehicle window sunshade curtain unit and an adjustment unit. The vehicle window sunshade curtain unit includes transverse fibers and longitudinal fibers. The adjustment unit includes a transverse adjustment component and a longitudinal adjustment component. The transverse adjustment component is used to adjust the transverse spacing between two adjacent transverse fibers of the curtain, and the longitudinal adjustment component is used to adjust the longitudinal spacing between two adjacent longitudinal fibers of the curtain.

[0008] In a preferred embodiment of the present invention, the method for obtaining the mesh diameter and porosity parameters of a vehicle window sunshade system based on the opening value of the vehicle window glass includes: establishing a wind vibration condition table according to the opening range of the vehicle window; calibrating the vehicle window wind vibration simulation model using wind tunnel measurement data of wind vibration noise from actual vehicle windows; setting a porous medium flow resistance model in the area of ​​the vehicle window sunshade, wherein the porous medium flow resistance model includes a viscous resistance coefficient and an inertial resistance coefficient; determining the value range of the viscous resistance coefficient and the inertial resistance coefficient based on the material and specifications of the vehicle window sunshade fabric, and obtaining its sample set; determining the optimal viscous resistance coefficient and the inertial resistance coefficient of each window under different opening degrees through wind vibration noise simulation optimization; converting the optimal viscous resistance coefficient and the inertial resistance coefficient into corresponding mesh diameter and porosity parameters; and writing the mesh diameter and porosity parameters into the control program of the controller.

[0009] In a preferred embodiment of the present invention, the wind vibration condition table includes window openings from 5% to 100%, divided in 5% intervals, and determines the position of the window glass at each opening.

[0010] In a preferred embodiment of the present invention, the start-up and stop-up conditions of the vehicle window sunshade control system are set; wherein, the start-up conditions include vehicle speed and window opening degree, and the stop-up conditions include window closing command and vehicle locking command.

[0011] In a preferred embodiment of the present invention, the sunshade curtain fabric product is selected based on the mesh diameter and porosity parameters when each window is 100% open; the mesh diameter and porosity parameters of the curtain fabric at each window opening are verified and optimized through a wind tunnel test of the actual vehicle's wind vibration and noise; and the optimized parameters are updated into the controller's control program.

[0012] In a preferred embodiment of the present invention, the viscous drag coefficient and the inertial drag coefficient are determined by the pressure drop, material thickness and surface flow velocity of the porous medium material.

[0013] In a preferred embodiment of the present invention, the mesh diameter and porosity parameters are determined based on the pressure drop, thickness, surface flow velocity, air density, and air viscosity of the porous medium material.

[0014] In a preferred embodiment of the present invention, the control system continuously monitors the closing conditions of the window sunshade system.

[0015] The present invention also discloses a vehicle that includes a system for actively suppressing wind noise from vehicle windows.

[0016] The beneficial effects of this invention are as follows: Compared with existing wind noise control methods, this invention does not require modification of the vehicle body structure, does not affect the overall vehicle appearance, and avoids interference with users' window-opening habits, providing an innovative solution that balances noise reduction effectiveness and ease of use. The technical solution of this invention not only effectively improves the in-vehicle noise environment and enhances driving comfort, but also has significant engineering application value.

[0017] First, this invention establishes a complete wind vibration condition table and calibrates the simulation model using wind tunnel test data, ensuring the accuracy and reliability of wind vibration noise simulation analysis. Second, this invention applies a porous medium flow resistance model to the design of car window sunshade curtains, achieving precise control of wind vibration noise by optimizing the viscous and inertial drag coefficients.

[0018] Furthermore, this invention employs a parametric design method, establishing a correspondence between mesh diameter and porosity and flow resistance coefficient. This allows theoretical optimization results to directly guide the actual selection and manufacturing of sunshade curtain fabric, significantly improving design efficiency. Simultaneously, this invention considers wind vibration characteristics across the entire operating range, achieving effective wind noise suppression within a window opening range of 5% to 100%, greatly enhancing the applicability of the solution.

[0019] In terms of control strategy, this invention achieves intelligent control of the vehicle window sunshade system by systematically setting start-up and shutdown conditions, including key parameters such as vehicle speed and window opening. This adaptive adjustment mechanism based on real-time operating conditions ensures noise reduction while improving user experience. Furthermore, this invention establishes a complete technical route from simulation optimization to real-vehicle verification, further enhancing the engineering practicality of the solution through real-vehicle wind tunnel testing to correct and iterate the optimized parameters. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of existing technology for car window sunshades;

[0022] Figure 2 This is a schematic diagram of a vehicle window sunshade control system according to the present invention;

[0023] Figure 3 This is a schematic diagram of a vehicle window sunshade control system according to the present invention;

[0024] Figure 4 This is a schematic diagram illustrating the improvement effect of a vehicle window sunshade control system of the present invention at various vehicle speeds with the rear window opening at 50%.

[0025] Figure 5 This is a schematic diagram illustrating the improvement effect of the rear window opening of the vehicle window sunshade control system of the present invention at a vehicle speed of 70 km / h and 50% speed.

[0026] Figure 6 This is a flowchart of the operation of a vehicle window sunshade control system according to the present invention;

[0027] Figure 7 This is a design flowchart of a vehicle window sunshade control system according to the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] like Figure 2-7 As shown, this invention discloses a vehicle window sunshade control system, which analyzes the mechanism of wind-induced vibration in vehicle windows and proposes solutions. Since the mesh diameter and porosity of current vehicle window sunshade fabric cannot be changed, this solution cannot address the wind-induced vibration problem at various window opening angles. To address the shortcomings of current vehicle window sunshade solutions, this patent proposes a vehicle window sunshade structure with adjustable mesh diameter and porosity in real time. By adjusting the mesh diameter and porosity of the sunshade fabric in real time, it matches the flow field characteristics at various window opening angles, ultimately achieving a better improvement in vehicle window wind-induced vibration noise. Specifically, the steps of this invention include:

[0030] Step 1: Start the vehicle and the window sunshade system will activate.

[0031] Step 2: The control system detects the activation conditions of the window sunshade system. If the activation conditions are not met, the control system continues to detect the activation conditions. When the activation conditions are met, the system will prompt the occupants that "the window sunshade system will be opened".

[0032] Step 3: The system controls the motor to open the sunshade and cover the entire window glass area.

[0033] Step 4: The control system detects the actual position of the window glass, calculates its actual opening value and compares it with the opening set value in the system, determines the opening value that is closest to it, and indexes the mesh diameter and porosity of the corresponding sunshade curtain fabric in the system.

[0034] Step 5: The controller sends commands to the horizontal and vertical control motors respectively. The motors pull the horizontal and vertical fibers of the curtain to the designated positions respectively, completing the real-time adjustment of the curtain mesh diameter and porosity, and optimizing the wind vibration noise inside the vehicle under the window opening condition in real time.

[0035] Step 6: When the control system detects a change in the opening position of the window glass, the control system completes the wind noise optimization under the new window opening according to steps 4-5.

[0036] Step 7: The control system detects the closing conditions of the window sunshade system. If the activation conditions are not met, the control system continues to detect the closing conditions. When the closing conditions are met, the system will prompt the occupants with a voice message that "the window sunshade system will be closed".

[0037] Step 8: The controller sends commands to the horizontal and vertical control motors respectively, and the motors pull the horizontal and vertical fibers of the curtain to their initial positions respectively.

[0038] Step 9: The control system controls the motor to retract the sunshade of the car window.

[0039] In step 4, the method for obtaining the mesh diameter and porosity parameters of the vehicle window sunshade system based on the opening value of the vehicle window glass includes:

[0040] Step 4.1: Select commonly used window openings (5%-100%), with window openings at 5% intervals, to obtain a wind vibration condition table for each window opening; determine the position of the window glass at each opening based on the maximum sliding stroke of the window glass.

[0041] Table 1

[0042]

[0043] Step 4.2: Use wind tunnel measurement data of wind vibration noise from actual vehicle windows of existing models to calibrate the simulation model of wind vibration of the windows.

[0044] Step 4.3: For the window sunshade area, apply a porous medium flow resistance model to the window sunshade fabric as shown in Equation (1).

[0045]

[0046] In the formula: ΔP is the pressure drop of the porous medium, L is the thickness of the porous medium, and v ∞ Let be the inflow velocity at the surface of the porous medium, a be the viscous drag coefficient, and b be the inertial drag coefficient.

[0047] Step 4.4: Based on the common material specifications and parameter ranges of car window sunshade curtain fabric, obtain the value ranges of parameters a and b, and use a sampling method to obtain the sample set of values ​​for parameters a and b.

[0048] Step 4.5: Select a specific car window. Choose a window opening from Table 1. Establish a corresponding wind vibration simulation model for the window using the method in Step 4.2. Substitute the sample set of values ​​for parameters a and b from Step 4.4 into the simulation model in Step 4.2 to perform wind vibration noise simulation optimization, obtaining the optimal solution a for parameters a and b of the window at that opening. opt 、b opt .

[0049] Step 4.6: Solve for a opt 、b opt The corresponding mesh diameter and porosity.

[0050] The Ergun empirical formula for the flow resistance model of porous media is shown in equation (2).

[0051]

[0052] In the formula: ΔP is the pressure drop of the porous medium, L is the thickness of the porous medium, and v ∞ Let ε be the inflow velocity at the surface of the porous medium, ε be the porosity of the material, and d be the flow velocity. p ρ is the particle diameter, ρ is the air density, and μ is the air viscosity.

[0053] By comparing equations (1) and (2), we can obtain the relationship between parameters a and b and the mesh diameter and porosity of the porous medium material, as shown in equations (3) and (4) below.

[0054]

[0055] a opt 、b opt Substituting into equations (3) and (4), the corresponding mesh diameter d can be obtained. p and porosity ε.

[0056] Step 4.7: Following the methods in steps 4.5-4.6, calculate the mesh diameter d for the optimal wind vibration noise inside the vehicle under all opening angles listed in Table 1 for the window. p and porosity ε.

[0057] Step 4.8: Following the methods in steps 4.5-4.7, calculate the mesh diameter d for all window openings in Table 1 that yields the optimal wind-induced vibration noise inside the vehicle. p and porosity ε.

[0058] Step 4.9: Calculate the mesh diameter d of each window obtained in Step 4.8 for each opening degree in Table 1. p The porosity ε result is written into the controller's control program.

[0059] Step 4.10: Determine the activation conditions of the window sunshade control system, including vehicle speed and window opening; determine the deactivation conditions of the window sunshade control system, including window closing command and vehicle locking command.

[0060] Step 4.11: Write the start-up and stop conditions of the window sunshade control system from Step 4.10 into the controller's control program.

[0061] Step 4.12: Based on the parameter optimization results in Step 4.8, index the mesh diameter d when each window opening is 100%. p Using the porosity ε as an initial value, we selected sunshade curtain fabric products corresponding to the parameters, manufactured car window sunshades, and conducted wind tunnel tests on actual vehicle wind vibration noise to confirm the improvement effect on in-vehicle wind vibration noise. We also optimized the curtain mesh diameter d of each window at each opening degree. p and porosity ε.

[0062] Step 4.13: Calculate the mesh diameter d of each window of the optimized vehicle at each opening degree. p The porosity ε is updated in the controller's control program, thus solidifying the system control software.

[0063] The following section uses the design and implementation of an active suppression system for wind vibration noise from the rear window of a certain vehicle model as an example to illustrate the specific implementation process of this invention.

[0064] S1. An analysis of the structural characteristics of the rear window glass of this vehicle model is conducted. The rear window of this model uses an electric lift system with a maximum opening stroke of 450mm. Based on the opening degree division principle in Table 1, 20 opening degree values ​​are determined at 5% intervals, and the corresponding glass opening position for each opening degree value is accurately calculated using 3D modeling software. For example, a 5% opening degree corresponds to a glass opening position P1 of 22.5mm, a 10% opening degree corresponds to position P2 of 45mm, and so on, up to a 100% opening degree corresponding to position P20 of 450mm.

[0065] S2. After establishing the mapping relationship between opening degree and position, a simulation model of the rear window wind noise of this vehicle model is constructed. The model focuses on the external flow field characteristics of the vehicle body, the influence of the glass opening position on airflow, and the acoustic characteristics of the interior cavity. By setting different sunshade curtain parameters and performing iterative calculations, the optimal combination of mesh diameter and porosity for each opening degree is obtained. For example, under the 50% opening condition, the optimized mesh diameter of 0.8 mm and porosity of 65% result in the most significant reduction in interior wind noise.

[0066] S3. To verify the accuracy of the simulation optimization results, a real-vehicle wind tunnel test was conducted to assess wind vibration and noise. The test was carried out in an automotive acoustic wind tunnel laboratory with wind speeds ranging from 30-120 km / h. A multi-channel acoustic testing system was used to simultaneously collect noise data from different measuring points inside the vehicle. By comparing and analyzing the test results under different parameter combinations, the mesh diameter and porosity obtained from the simulation optimization were fine-tuned and optimized. The final determined parameter results were written into the controller's EEPROM for parameter indexing during actual system operation.

[0067] The S4 system's control strategy combines real-time monitoring with intelligent adjustment. The control system continuously monitors activation parameters, including vehicle speed, window opening degree, and ambient temperature. When the vehicle speed exceeds 30 km / h and the window opening degree is greater than 10%, the system determines that the activation conditions are met. At this point, a voice prompt stating "The window sunshade system will be opened" is issued through the in-vehicle audio system to remind occupants that the system is about to activate.

[0068] The S5's startup process is executed by a specially designed motor control mechanism. This mechanism uses a dual-motor drive system with an output torque of no less than 2 N·m, ensuring that the sunshade can be smoothly and quickly deployed to cover the entire window glass area. A position feedback device is installed during deployment to monitor the sunshade's position in real time.

[0069] The S6 uses a high-precision Hall sensor to detect the position of the vehicle window glass in real time, with a resolution of 0.1mm. The controller converts the detected actual position into an opening value and compares it with 20 preset standard openings, using the nearest neighbor principle to determine the opening value corresponding to the current operating condition. Subsequently, the system reads the optimal mesh diameter and porosity parameters corresponding to this opening value from the EEPROM.

[0070] The S7 sunshade curtain features an innovative variable structure design, dynamically adjusting the mesh characteristics through the relative displacement of the horizontal and vertical fibers. Two precision stepper motors control the movement of the horizontal and vertical fibers respectively, with a stepping accuracy of 0.01mm, ensuring precise adjustment of the mesh diameter and porosity. The system response time is less than 1 second, enabling rapid adjustment in response to changes in operating conditions.

[0071] S8: When the driver adjusts the window position, the system can respond to the change in a timely manner. The controller re-executes the parameter indexing and adjustment process to ensure that the best noise reduction effect is maintained under the new window opening conditions.

[0072] The S9 system's closing conditions include: detecting a window closing command, the vehicle speed dropping below 30 km / h, and receiving a lock signal. When any of these conditions are met, the system will also inform the occupants via voice prompt that the closing operation is about to be performed.

[0073] S10, the closing process begins with the reset of the fabric structure. Two motors operate synchronously, driving the transverse and longitudinal fibers back to their initial positions, at which point the mesh diameter and porosity return to standard conditions.

[0074] S11, the system controls the unfolding motor to rotate in reverse, driving the sunshade to retract into the storage box. The entire retraction process is smooth and reliable, taking no more than 5 seconds. After retraction is complete, the control system enters standby mode, waiting for the next activation condition to be triggered.

[0075] It should be noted that the automotive windows described in this invention include, but are not limited to, automotive side windows and automotive roof windows.

[0076] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0077] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0078] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A system for actively suppressing wind noise from car windows, characterized in that: The system includes vehicle window glass and a sunshade curtain system that can adjust the mesh diameter and porosity parameters of the sunshade curtain fabric in real time based on the window opening value. The opening value of the vehicle window glass is determined based on the actual position and the calibrated position of the vehicle window glass; the mesh diameter and porosity parameters of the sunshade curtain system are obtained based on the window opening value; and the sunshade curtain system adjusts the sunshade curtain fabric based on the mesh diameter and porosity parameters.

2. The system for actively suppressing wind noise from car windows according to claim 1, characterized in that, The vehicle window sunshade system includes a vehicle window sunshade curtain unit and an adjustment unit. The vehicle window sunshade curtain unit includes horizontal fibers and vertical fibers. The adjustment unit includes a horizontal adjustment component and a vertical adjustment component. The horizontal adjustment component is used to adjust the horizontal spacing between two adjacent horizontal fibers of the curtain, and the vertical adjustment component is used to adjust the vertical spacing between two adjacent vertical fibers of the curtain.

3. The system for actively suppressing wind noise from car windows according to claim 2, characterized in that, The method for obtaining the mesh diameter and porosity parameters of a vehicle window sunshade system based on the opening value of the vehicle window glass includes: establishing a wind vibration condition table according to the opening range of the vehicle window; calibrating the vehicle window wind vibration simulation model using wind tunnel measurement data of wind vibration noise from actual vehicle windows; setting a porous medium flow resistance model in the curtain area of ​​the vehicle window sunshade, the porous medium flow resistance model including viscous drag coefficient and inertial drag coefficient; determining the value range of the viscous drag coefficient and inertial drag coefficient based on the material and specifications of the vehicle window sunshade curtain, and obtaining its sample set; determining the optimal viscous drag coefficient and inertial drag coefficient of each window under different openings through wind vibration noise simulation optimization; converting the optimal viscous drag coefficient and inertial drag coefficient into the corresponding mesh diameter and porosity parameters; and writing the mesh diameter and porosity parameters into the control program of the controller.

4. The system for actively suppressing wind noise from automobile windows according to claim 3, characterized in that, The wind vibration test chart includes window openings from 5% to 100%, divided in 5% intervals, and determines the position of the window glass at each opening.

5. The system for actively suppressing wind noise from automobile windows according to claim 3, characterized in that, The activation and deactivation conditions of the vehicle window sunshade control system are set; wherein, the activation conditions include vehicle speed and window opening degree, and the deactivation conditions include window closing command and vehicle locking command.

6. The system for actively suppressing wind noise from automobile windows according to claim 3, characterized in that, The sunshade curtain fabric product was selected based on the mesh diameter and porosity parameters of each window at 100% opening; the mesh diameter and porosity parameters of the curtain fabric at each opening degree were verified and optimized through wind tunnel tests on actual vehicles to verify and optimize them; and the optimized parameters were updated into the controller's control program.

7. The system for actively suppressing wind noise from automobile windows according to claim 3, characterized in that, The viscous drag coefficient and the inertial drag coefficient are determined by the pressure drop, material thickness, and surface flow velocity of the porous medium material.

8. The system for actively suppressing wind noise from automobile windows according to claim 3, characterized in that, The mesh diameter and porosity parameters are determined based on the pressure drop, thickness, surface flow velocity, air density, and air viscosity of the porous medium material.

9. The system for actively suppressing wind noise from automobile windows according to claim 1, characterized in that, The control system continuously monitors the closing conditions of the window sunshade system.

10. A vehicle, characterized in that, Including the system for actively suppressing wind noise from vehicle windows as described in any one of claims 1-9.

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