Diffuser assembly, wind resistance reducing method and system and vehicle

Abstract

The invention relates to a diffuser assembly, a wind resistance reducing method and system and a vehicle, and relates to the technical field of vehicles. The diffuser assembly (10) comprises a diffuser body (11) and a driving mechanism (12), the diffuser body (11) is arranged below a rear bumper of the vehicle (1); the driving mechanism (12) is used for driving the diffuser body (11) to be switched between an extending state and a retracting state relative to the vehicle (1); the length of the vehicle (1) in the extended state of the diffuser body (11) is greater than the length of the vehicle (1) in the retracted state of the diffuser body (11). As a result, it is possible to achieve a lower wind resistance while maintaining a graceful shape of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, in particular to the field of vehicle wind resistance adjustment technology, and specifically to a diffuser assembly, a wind resistance reduction method, a system and a vehicle. Background Art

[0002] With the increasing popularity of pure electric vehicles, their driving range has become a focus of attention for consumers and automakers. During the driving process, the energy loss caused by wind resistance in pure electric vehicles is significantly higher than that in fuel vehicles and hybrid vehicles. Therefore, in the overall design process of pure electric vehicles, how to effectively reduce wind resistance is particularly important. However, some excellent styling designs are often not conducive to reducing vehicle wind resistance. How to achieve lower wind resistance design while maintaining beautiful styling has become a major problem faced by automakers in the field of pure electric vehicle design.

[0003] One related technology proposes that the drive motor adjusts the angle of the variable mechanical structure baffle up and down based on the vehicle speed, wheel angle, and steering wheel angle parameters to enhance the stability of the vehicle. Another related technology proposes a diffuser assembly that can prevent the airflow flowing through the bottom of the car from moving upward along the diffuser too early in the lower area of ​​the rear bumper to reduce wind resistance. Summary of the invention

[0004] The present application provides a diffuser assembly, a method for reducing wind resistance, a system and a vehicle, so as to at least solve the technical problem in the related art that it is impossible to achieve a lower wind resistance design while maintaining a beautiful shape. The technical solution of the present application is as follows:

[0005] According to a first aspect provided by the present application, a diffuser assembly is provided, comprising: a diffuser body and a driving mechanism; the diffuser body is arranged below a rear bumper of a vehicle; the driving mechanism is used to drive the diffuser body to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the diffuser body is in the extended state is greater than the length of the diffuser body in the retracted state.

[0006] According to the above technical means, the present application can make the diffuser of the vehicle dynamically extend and retract. When the diffuser is extended, the length of the vehicle body can be increased to reconstruct the airflow field structure of the vehicle, effectively reducing the drag coefficient of the whole vehicle. In addition, after the diffuser is retracted, the vehicle can maintain its original beautiful shape and meet consumers' aesthetic needs for the vehicle's appearance.

[0007] In one possible implementation, the driving mechanism includes a telescopic motor; the telescopic motor is fixed to the vehicle, and an output end of the telescopic motor is connected to the diffuser body.

[0008] According to the above technical means, the present application can drive the diffuser body to switch between an extended state and a retracted state relative to the vehicle through a retractable motor, and accurately control the dynamic extension and retraction of the diffuser body.

[0009] In a possible implementation, the diffuser assembly further includes: a guide structure; the guide structure is disposed on the vehicle and extends along the telescopic direction of the diffuser body; and the diffuser body is slidably connected to the guide structure.

[0010] According to the above technical means, the present application can physically constrain the lateral displacement of the diffuser body through the guide structure, reduce vibration and deflection during high-speed extension and retraction, and ensure the stability of the diffuser body during movement.

[0011] In one possible implementation, the guide structure includes a slide rail.

[0012] According to the above technical means, the present application can effectively suppress the vibration and deflection of the diffuser body that may be generated when the vehicle moves at high speed through the slide rail.

[0013] In a possible implementation, the diffuser assembly further includes: a fastening bracket; the fastening bracket is used to fix the driving mechanism and the guide structure on the vehicle.

[0014] According to the above technical means, the present application can fix the driving mechanism and the guide structure on the vehicle by fastening the bracket to ensure the stability of the diffuser assembly and suppress the vibration and deflection of the driving mechanism and the guide structure when the vehicle moves at high speed.

[0015] In a possible implementation manner, the fastening bracket is also used to fix the connection between the diffuser body and the guide structure.

[0016] According to the above technical solution, the present application can fix the connection between the diffuser body and the guide structure by fastening the bracket, so that the connection between the diffuser body and the guide structure is more firm, thereby improving the stability of the diffuser body when the vehicle is driving.

[0017] According to a second aspect provided by the present application, a method for reducing wind resistance is provided, which is applied to the diffuser assembly in the first aspect, and the method includes: obtaining a vehicle speed; based on the vehicle speed, controlling the diffuser body to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the diffuser body is in the extended state is greater than the length of the telescopic member in the retracted state.

[0018] According to the above-mentioned technical means, the present application can control the extension or retraction of the diffuser body based on the real-time speed signal of the vehicle, so that the diffuser body is in an extended state, that is, after the diffuser body is extended, the airflow field structure of the vehicle is reconstructed, thereby effectively reducing the wind resistance coefficient of the whole vehicle. In addition, when the diffuser body is in a retracted state, the original beautiful shape of the vehicle can be maintained, thereby satisfying the aesthetic needs of consumers for the appearance of the vehicle.

[0019] In one possible implementation, based on the vehicle speed, the diffuser body is controlled to switch between an extended state and a retracted state relative to the vehicle. When the vehicle speed is less than a speed threshold for a first duration greater than a duration threshold, the diffuser body is controlled to be in the extended state; when the vehicle speed is greater than or equal to the speed threshold for a second duration greater than the duration threshold, the diffuser body is controlled to be in the retracted state.

[0020] According to the above technical means, the present application can extend the diffuser body when the vehicle is traveling at high speed to reduce wind resistance, and retract the diffuser body when the vehicle is traveling at a low speed to shorten the length of the vehicle body and increase the turning radius of the vehicle on narrow roads. In addition, by considering the duration threshold, frequent extension and retraction caused by instantaneous fluctuations in vehicle speed can be avoided, and false trigger signals (such as temporary abnormalities in the vehicle speed sensor caused by bumpy road conditions) can be filtered.

[0021] In one possible implementation, controlling the diffuser body to be in the extended state includes: based on an extension parameter of the diffuser body when the diffuser body is in the extended state, controlling the diffuser body to be extended so that the vehicle satisfies a preset condition when the diffuser body is in the extended state; the extension parameter is determined based on a body structure of the vehicle.

[0022] According to the above technical means, the present application can determine the optimal extension parameters of the diffuser body through the vehicle body structure to ensure that the rigidity and strength of the vehicle meet the normal driving conditions of the vehicle.

[0023] In one possible implementation, based on the above technical means, the present application can use the extension parameters to make the vehicle's shape a minimum wind resistance shape when the diffuser body is in the extended state, so as to reduce the vehicle's wind resistance.

[0024] According to a third aspect provided by the present application, a wind resistance reduction system is provided, which includes: a diffuser assembly and a vehicle control unit; the vehicle control unit; the vehicle control unit is used to collect the vehicle speed and send the vehicle speed to the diffuser assembly; the diffuser assembly is used to control the diffuser body to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

[0025] According to a fourth aspect provided by the present application, there is provided a diffuser assembly, comprising: an acquisition unit and a control unit;

[0026] An acquisition unit, used for acquiring the speed of the vehicle;

[0027] A control unit is used to control the diffuser body to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed; the length of the vehicle when the diffuser body is in the extended state is greater than the length of the diffuser body in the retracted state.

[0028] In a possible implementation, the control unit is specifically configured to: control the diffuser body to be in the extended state when the first duration of the vehicle speed being less than the speed threshold is greater than the duration threshold;

[0029] When the second duration when the vehicle speed is greater than or equal to the speed threshold is greater than the duration threshold, the diffuser body is controlled to be in the retracted state. In a possible implementation, the control unit is specifically configured to: control the diffuser body to be extended based on an extension parameter when the diffuser body is in the extended state, so that the vehicle meets a preset condition when the diffuser body is in the extended state; the extension parameter is determined based on the body structure of the vehicle.

[0030] According to a fifth aspect provided by the present application, a vehicle is provided, comprising the wind resistance reduction system in the third aspect.

[0031] According to the sixth aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] According to the seventh aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0033] According to the eighth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0034] It should be noted that the technical effects brought about by any implementation method in the second to eighth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0035] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0037] Figure 1 is a schematic diagram of a hardware structure of a vehicle according to an exemplary embodiment;

[0038] Figure 2 is a schematic diagram of the hardware structure of a diffuser assembly according to an exemplary embodiment;

[0039] Figure 3 is a schematic diagram of the hardware structure of another diffuser assembly according to an exemplary embodiment;

[0040] Figure 4 is a hardware structure diagram of a wind resistance reduction system according to an exemplary embodiment;

[0041] Figure 5 is a flow chart of a method for reducing wind resistance according to an exemplary embodiment;

[0042] Figure 6 is a side rear view of a vehicle rear end when a diffuser body is in an extended state according to an exemplary embodiment;

[0043] Figure 7 is a side rear view of a vehicle rear end when a diffuser body is in a retracted state according to an exemplary embodiment;

[0044] Figure 8 is a side view of a vehicle rear end when a diffuser body is in an extended state according to an exemplary embodiment;

[0045] Fig. 9 is a side view of a vehicle rear end when a diffuser body is in a retracted state according to an exemplary embodiment;

[0046] Fig.10 is a schematic diagram of a drag reduction process according to an exemplary embodiment;

[0047] Fig.11 is a block diagram of a diffuser assembly according to an exemplary embodiment;

[0048] Fig.12 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0051] As the background technology, in order to solve the problem in the related art that it is impossible to achieve a lower wind resistance design while maintaining a beautiful shape, the present application provides a method for reducing wind resistance, which is applied to a diffuser assembly. The diffuser assembly includes: a diffuser body and a driving mechanism. The method includes: the driving mechanism obtains the speed of the vehicle, and based on the speed, controls the diffuser body to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the diffuser body is in the extended state is greater than the length when the diffuser body is in the retracted state.

[0052] Based on this, the present application can control the extension or retraction of the diffuser body based on the real-time speed signal of the vehicle, so that the diffuser body is in an extended state, that is, after the diffuser body is extended, the airflow field structure of the vehicle is reconstructed, thereby effectively reducing the wind resistance coefficient of the whole vehicle. In addition, when the diffuser body is in a retracted state, the original beautiful shape of the vehicle can be maintained, thereby satisfying consumers' aesthetic needs for the vehicle's appearance.

[0053] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0054] The wind resistance reduction device provided in the embodiment of the present application can be applied in a vehicle. A vehicle can also be referred to as a vehicle, a mobile carrier, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a fuel cell vehicle (FCV), an autonomous vehicle, an intelligent and connected vehicle (ICV), a driverless vehicle, etc.

[0055] For example, Figure 1 As shown, the present application provides a vehicle 1 .

[0056] In the embodiment of the present application, the vehicle 1 may be a car, a sport utility vehicle (SUV), a truck, an electric vehicle, a motorcycle, a tricycle, a special vehicle (such as an ambulance, a fire truck, a police car, etc.), an unmanned taxi, an intelligent networked bus, an automatic driving logistics vehicle, an electric truck, etc. In addition, the method is also applicable to various special vehicles, such as agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, port vehicles, etc. This application does not make specific restrictions on this.

[0057] like Figure 2 As shown, the present application provides a diffuser assembly 10 .

[0058] In a possible implementation, the diffuser assembly 10 may include: a diffuser body 11 , a driving mechanism 12 , a guide structure 13 , and a fastening bracket 14 .

[0059] Optionally, the diffuser body 11 may be disposed below the rear bumper of the vehicle 1 and connected to an output end of the driving mechanism 12 .

[0060] In practical applications, the diffuser body 11 may be connected to one or more driving mechanisms 12 .

[0061] For ease of understanding, the present application is described by taking the connection between a diffuser body and a driving mechanism 12 as an example.

[0062] Optionally, the driving mechanism 12 may include a retractable motor. In the case where the driving mechanism 12 is a retractable motor, an output end of the retractable motor may be connected to the diffuser body 11 .

[0063] In a possible implementation, the driving mechanism 12 may be used to drive the diffuser body 11 to switch between an extended state and a retracted state relative to the vehicle 1 .

[0064] Specifically, the driving mechanism 12 can drive the diffuser body 11 to switch between the extended state and the retracted state relative to the vehicle 1 based on the sliding connection between the guide structure 13 and the diffuser body 11 .

[0065] Optionally, the guide structure 13 may include a slide rail. The guide structure 13 is disposed on the vehicle 1 and extends along the telescopic direction of the diffuser body 11 .

[0066] In a possible implementation, the fastening bracket 14 can be used to fix the driving mechanism 12 and the guide structure 13 on the vehicle 1. The fastening bracket 14 can also be used to fix the connection between the diffuser body 11 and the guide structure 13.

[0067] For example, in combination Figure 2 ,like Figure 3 As shown, the present application provides a top view of a diffuser assembly 10 . Figure 3 The diffuser assembly 10 may include: a diffuser body 11 , a driving mechanism 12 , a guide structure 13 , and a fastening bracket 14 .

[0068] like Figure 4 As shown, the present application provides a drag reduction system 30. In a possible implementation, the drag reduction system 30 can be deployed on a vehicle. The drag reduction system 30 can include a diffuser assembly 31, a vehicle control unit 32, and a data acquisition unit 33.

[0069] In a possible implementation, a communication connection may be established between the diffuser assembly 31 and the vehicle control unit 32. A communication connection may be established between the vehicle control unit 32 and the data acquisition unit 33.

[0070] In practical applications, the vehicle control unit 32 may be communicatively connected with one or more data acquisition units 33 .

[0071] For ease of understanding, the present application takes the communication connection between a vehicle control unit 32 and a data acquisition unit 33 as an example for explanation.

[0072] Optional, Figure 1 The vehicle control unit 32 and the data acquisition unit 33 of the battery in the vehicle can be functional modules integrated into the same device, or can be devices independently arranged from each other. This application does not limit this.

[0073] It is easy to understand that when the vehicle control unit 32 and a data acquisition unit 33 are functional modules integrated in the same device, the communication between the vehicle control unit 32 and the data acquisition unit 33 is the communication between the internal modules of the device. In this case, the communication process between the two is the same as the "communication process when the vehicle control unit 32 and the data acquisition unit 33 are independently set up".

[0074] For ease of understanding, the present application is mainly explained by taking the independent configuration of the vehicle control unit 32 and a data acquisition unit 33 as an example.

[0075] Figure 4 The vehicle control unit 32 can collect the current driving speed of the vehicle based on the data collection unit 33, and send the current driving speed of the vehicle to the diffuser assembly 31. The diffuser assembly 31 can receive the current driving speed of the vehicle sent by the vehicle control unit 32, and control the telescopic member to switch between the extended state and the retracted state relative to the vehicle based on the current driving speed of the vehicle.

[0076] Optionally, Figure 4 The vehicle control unit 32 may be a terminal, a server, or other types of electronic equipment. Figure 4 What is shown in the figure is only an example of the device form of the vehicle control unit 32 and does not constitute a limitation thereto.

[0077] In the case where the vehicle control unit 32 is a terminal, the terminal can be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The terminal can communicate with one or more core networks via a radio access network (RAN). The terminal can be a mobile terminal, such as a computer with a mobile terminal, or a mobile device built into the vehicle, which exchanges language and / or data with the radio access network, for example, a mobile phone, a tablet computer, a laptop computer, a netbook, a personal digital assistant (PDA). This application does not impose any restrictions on this.

[0078] When the vehicle control unit 32 is a server, the server may be a single server, or a server cluster composed of multiple servers. In some implementations, the server cluster may also be a distributed cluster. This application does not impose any restrictions on this.

[0079] It should be noted that the structure illustrated in the embodiment of the present application does not constitute a limitation on the wind resistance reduction system. It may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0080] For ease of understanding, the wind resistance reduction method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0081] like Figure 5 As shown, the present application provides a method for reducing wind resistance, which can be applied to a diffuser assembly, including the following steps: S501-S502.

[0082] S501: Obtain the vehicle speed.

[0083] In one possible implementation, the diffuser assembly can be connected to a vehicle control unit for communication. The vehicle control unit can collect the current speed of the vehicle in real time and send the speed to the diffuser assembly. The diffuser assembly can receive the speed sent by the vehicle control unit.

[0084] In a possible implementation, the diffuser assembly may be equipped with a speed sensor, and the diffuser assembly may obtain the current speed of the vehicle in real time based on the speed sensor.

[0085] S502 : Based on the vehicle speed, control the diffuser body to switch between an extended state and a retracted state relative to the vehicle.

[0086] in,

[0087] The length of the vehicle when the diffuser body is in the extended state is greater than the length of the vehicle when the diffuser body is in the retracted state. The length of the vehicle when the diffuser body is in the extended state is the sum of the extended length of the diffuser body and the length of the vehicle when the diffuser body is in the retracted state.

[0088] In one embodiment, the diffuser assembly can switch the state of the diffuser body based on the speed of the vehicle.

[0089] In one possible implementation, the diffuser assembly can continuously monitor the vehicle speed, and when the vehicle speed is less than a speed threshold for a first duration greater than a duration threshold, the diffuser body is controlled to be in an extended state to optimize the vehicle's airflow path and reduce wind resistance.

[0090] In yet another possible implementation, when the second duration during which the vehicle speed is greater than or equal to the speed threshold is greater than the duration threshold, the diffuser body is controlled to be in a retracted state to keep the vehicle compact and facilitate flexible turning and parking.

[0091] Optionally, the speed threshold may be set according to actual needs. For example, the speed threshold may be 40 kilometers per hour (km / h) or 60 km / h.

[0092] Optionally, the duration threshold can be set according to actual needs. For example, the duration threshold can be 20 seconds or 30 seconds. This application does not make specific restrictions on this.

[0093] In yet another embodiment, the diffuser assembly may switch the diffuser body state based on road condition information and vehicle speed.

[0094] In one possible implementation, the diffuser assembly can obtain road condition information and the current speed of the vehicle.

[0095] Among them, the road condition information may include at least one of the road condition type ahead (for example, city, mountainous area, tunnel, bridge, curve, etc.), congestion index, road grade (for example, highway, rural road, county road, etc.), speed limit information, weather conditions (for example, rainy days, snowy days, etc.), and traffic light information.

[0096] For example, the diffuser assembly can obtain the type of road condition ahead, congestion index, road grade, speed limit information, and traffic light information based on navigation information. The diffuser assembly can obtain weather conditions based on vehicle-mounted sensors or based on weather software.

[0097] In one possible implementation, the diffuser assembly can determine the state of the diffuser body based on road condition information and vehicle speed, and control the diffuser body to switch its state.

[0098] Exemplarily, when the vehicle is traveling on a straight section of a highway, the weather is clear, and the congestion index is 10% (unblocked), the diffuser assembly can control the diffuser body to be in an extended state to extend the vehicle body and reduce wind resistance.

[0099] Alternatively, when the vehicle is driving on a continuous curve on a mountain county road, the diffuser assembly can control the diffuser body to be in a retracted state to avoid the longer vehicle body interfering with the turn.

[0100] Alternatively, the diffuser assembly can control the diffuser body to be in a retracted state when the vehicle speed is less than a speed threshold and the navigation displays frequent traffic lights, giving priority to ensuring passability.

[0101] Alternatively, the diffuser assembly can control the diffuser body to be in a retracted state when there are continuous traffic lights on urban main roads and vehicles need to start and stop frequently, thereby reducing mechanical losses and avoiding scratching pedestrians.

[0102] For example, Figure 6As shown, the present application provides a side rear view of the rear of the vehicle when the diffuser body is in an extended state.

[0103] For example, Figure 7 As shown, the present application provides a side rear view of the rear of a vehicle when the diffuser body is in a retracted state.

[0104] For example, Figure 8 As shown, the present application provides a side view of the rear of a vehicle when the diffuser body is in an extended state.

[0105] For example, Fig. 9 As shown, the present application provides a side view of the rear of a vehicle when the diffuser body is in a retracted state.

[0106] based on Figure 6 and Figure 7 The comparison, and Figure 8 and Fig. 9 It can be seen from the comparison that the length of the vehicle when the diffuser body is in the extended state is greater than the length when the diffuser body is in the retracted state.

[0107] In a possible implementation, when the state of the diffuser body is switched, the diffuser assembly can send the switched state of the diffuser body to the vehicle control unit. The vehicle control unit can output the state of the diffuser body.

[0108] For example, the vehicle control unit can inform the vehicle that the diffuser body is in the extended state through a dashboard display or voice announcement that "drag optimization mode has been activated".

[0109] Alternatively, the vehicle control unit can inform the vehicle that the diffuser body is in the retracted state by displaying on the instrument panel or announcing by voice that "drag optimization mode is off".

[0110] In a possible implementation, the extension distance of the diffuser body in the extended state is determined according to the body structure of the vehicle.

[0111] Wherein, the vehicle meets a preset condition when the diffuser body is extended by the extension distance.

[0112] Optionally, the preset conditions may include that the vehicle's stiffness, strength, and noise-vibration-harshness (NVH) performance meet normal driving conditions of the vehicle.

[0113] In one possible implementation, the diffuser assembly can perform a vehicle-level joint simulation of the vehicle's diffuser body in extended and retracted states for wind resistance, stiffness, strength and NVH performance to determine the diffuser shape, that is, determine the extension length, extension angle and shape of the diffuser body in the extended state.

[0114] Exemplarily, the wind resistance simulation may include: simulating the aerodynamic characteristics of the vehicle under different operating conditions, comparing the drag coefficient of the vehicle in the original tail shape (the diffuser body is in a retracted state) and the extended shape (the diffuser body is in an extended state), and determining the minimum wind resistance shape through parameter optimization (such as extension angle, extension length).

[0115] Structural performance simulation can include: stiffness (torsion / bending stiffness) and strength (fatigue life) analysis of the vehicle body structure in both extended / retracted states of the diffuser body to ensure that stress in critical areas of the vehicle is below the material yield limit.

[0116] NVH simulation can include: analyzing the modal frequency shift and vibration transmission path caused by the movement of the diffuser body, optimizing the damping material layout to suppress resonance, and reducing noise to optimize the user experience.

[0117] The clay model wind tunnel test verification may include: making a vehicle clay model of a preset scale, simulating the actual driving conditions of the vehicle in a wind tunnel, and quantifying the flow field structure and pressure distribution at the rear of the vehicle.

[0118] By comparing the simulation and test results, the computational fluid dynamics (CFD) boundary conditions (such as turbulence intensity and wall function) are modified, and the tail shape is iteratively optimized until the wind resistance converges to determine the optimal wind resistance shape.

[0119] In one possible implementation, the diffuser assembly can determine the extension length of the diffuser body (e.g., 100 mm) based on the wind resistance optimization results. The diffuser assembly can perform a motion envelope analysis on the vehicle, define the minimum gap between the diffuser body and the body sheet metal, rear bumper, and exhaust system, and use topology optimization technology to adjust the layout between the diffuser body and other vehicle components to avoid interference from other vehicle components when the diffuser body moves. In another possible implementation, the diffuser assembly can analyze the center of gravity offset of the vehicle caused by the extension of the diffuser body based on the rigid-flexible coupling model of the vehicle, so as to design a counterweight slider or hydraulic balancing device to dynamically compensate for the change in the center of gravity of the vehicle.

[0120] Optionally, the diffuser assembly may be integrated with an active suspension control system to adjust the damping of the shock absorber in real time according to the state of the diffuser body to suppress the fluctuation of the pitch angle of the vehicle body. This application does not impose any specific restrictions on this.

[0121] Based on the above technical solution, the present application can control the extension or retraction of the diffuser body based on the real-time speed signal of the vehicle, so that the diffuser body is in an extended state, that is, after the diffuser body is extended, the airflow field structure of the vehicle is reconstructed, thereby effectively reducing the wind resistance coefficient of the whole vehicle. In addition, when the diffuser body is in a retracted state, the original beautiful shape of the vehicle can be maintained, thereby satisfying consumers' aesthetic needs for the vehicle's appearance.

[0122] In some embodiments, Fig.10 As shown, the present application provides a wind resistance reduction process.

[0123] S1001. Wake up the wind resistance reduction system after the vehicle is powered on.

[0124] In one possible implementation method, waking up the wind resistance reduction system means waking up the vehicle control unit and the diffuser assembly.

[0125] S1002. The vehicle control unit sends a vehicle speed signal to the diffuser assembly.

[0126] In one possible implementation, the diffuser assembly may execute S1003 or S1005 based on a vehicle speed signal.

[0127] S1003: The diffuser assembly determines that a first duration during which the vehicle speed is less than a speed threshold is greater than a duration threshold.

[0128] In a possible implementation manner, the diffuser assembly may execute S1004 when the first duration of the vehicle speed being less than the speed threshold is greater than the duration threshold.

[0129] S1004. The diffuser assembly controls the diffuser body to be in a retracted state.

[0130] In a possible implementation, after S1004 is completed, S1007 is executed.

[0131] S1005: The diffuser assembly determines that a second duration during which the vehicle speed is greater than or equal to the speed threshold is greater than the duration threshold.

[0132] In a possible implementation manner, the diffuser assembly may execute S1006 when the vehicle speed is greater than or equal to the speed threshold and the second duration is greater than the duration threshold.

[0133] S1006. The diffuser assembly controls the diffuser body to be in a retracted state.

[0134] In a possible implementation, after S1006 is completed, S1007 is executed.

[0135] S1007. The diffuser assembly sends the status of the diffuser body to the vehicle control unit.

[0136] S1008. The vehicle control unit displays the status of the diffuser body to the user.

[0137] like Fig.11 As shown, the present application provides a block diagram of a diffuser assembly. Fig.11 , the diffuser assembly includes: an acquisition unit 1101 and a control unit 1102.

[0138] In a possible implementation, the acquisition unit 1101 is used to acquire the speed of the vehicle.

[0139] In a possible implementation, the control unit 1102 is used to control the diffuser body to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

[0140] In a possible implementation, the control unit 1102 is specifically configured to: when the first duration of the vehicle speed being less than the speed threshold is greater than the duration threshold, control the diffuser body to be in the extended state; and when the second duration of the vehicle speed being greater than or equal to the speed threshold is greater than the duration threshold, control the diffuser body to be in the retracted state.

[0141] In one possible implementation, the control unit 1102 is specifically configured to: control the extension of the diffuser body based on an extension parameter of the diffuser body when the diffuser body is in the extended state, so that the vehicle meets a preset condition when the diffuser body is in the extended state.

[0142] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0143] like Fig.12 As shown, the present application provides a block diagram of an electronic device. Fig.12 As shown, the electronic device includes but is not limited to: a processor 1201 and a memory 1202 .

[0144] The memory 1202 is used to store executable instructions of the processor 1201. It can be understood that the processor 701 is configured to execute instructions to implement the test method in the above embodiment.

[0145] It should be noted that those skilled in the art can understand that Fig.12 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig.12 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0146] The processor 1201 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 1202, and calling data stored in the memory 1202, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1201 may include one or more processing units. Optionally, the processor 1201 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1201.

[0147] The memory 1202 may be used to store software programs and various data. The memory 1202 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a determination unit, a processing unit, etc.), etc. In addition, the memory 1202 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0148] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 702 including instructions, and the above instructions can be executed by a processor 1201 of an electronic device to implement the method in the above embodiment.

[0149] In actual implementation, Fig.11 The functions of the acquisition unit 1101 and the control unit 1102 in Fig.12 The processor 1201 in the embodiment calls the computer program stored in the memory 1202 to implement. The specific execution process can refer to the description of the method part in the above embodiment, which will not be repeated here.

[0150] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0151] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 1201 of the electronic device to complete the method in the above embodiment.

[0152] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0153] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0154] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0155] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0156] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0157] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0158] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A diffuser assembly, characterized in that: The diffuser assembly (10) comprises: a diffuser body (11) and a driving mechanism (12); the diffuser body (11) is arranged below a rear bumper of a vehicle (1); the driving mechanism (12) is used to drive the diffuser body (11) to switch between an extended state and a retracted state relative to the vehicle (1); the length of the vehicle (1) when the diffuser body (11) is in the extended state is greater than the length of the diffuser body (11) when it is in the retracted state.

2. The diffuser assembly according to claim 1, characterized in that: The driving mechanism (12) comprises a retractable motor; the retractable motor is fixed to the vehicle (1), and an output end of the retractable motor is connected to the diffuser body (11).

3. The diffuser assembly according to claim 1 or 2, characterized in that: The diffuser assembly (10) further comprises: a guide structure (13); the guide structure (13) is arranged on the vehicle (1) and extends along the telescopic direction of the diffuser body (11); the diffuser body (11) is slidably connected to the guide structure (13).

4. The diffuser assembly according to claim 3, characterized in that: The guide structure (13) comprises a slide rail.

5. The diffuser assembly according to claim 4, characterized in that: The diffuser assembly (10) further includes: a fastening bracket (14); The fastening bracket (14) is used to fix the driving mechanism (12) and the guiding structure (13) on the vehicle (1).

6. The diffuser assembly according to claim 5, characterized in that: The fastening bracket (14) is also used to fix the connection between the diffuser body (11) and the guide structure (13).

7. A method for reducing wind resistance, characterized in that: The diffuser assembly applied to any one of claims 1 to 6, the method comprising: Get the vehicle speed; Based on the vehicle speed, the diffuser body is controlled to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the diffuser body is in the extended state is greater than the length of the diffuser body in the retracted state.

8. The method according to claim 7, characterized in that The step of controlling the diffuser body to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed includes: When the first continuous time length of the vehicle speed being less than the speed threshold is greater than the time length threshold, controlling the diffuser body to be in the extended state; When the second duration during which the vehicle speed is greater than or equal to the speed threshold is greater than a duration threshold, the diffuser body is controlled to be in the retracted state.

9. The method according to claim 7 or 8, characterized in that: The method further comprises: Based on an extension parameter of the diffuser body when it is in the extended state, the diffuser body is controlled to be extended so that the vehicle meets a preset condition when the diffuser body is in the extended state; the extension parameter is determined based on a body structure of the vehicle.

10. The method according to claim 9, characterized in that The extension parameters include at least one of the extension length, the extension angle, and the shape after extension.

11. A wind resistance reduction system, characterized in that: The wind resistance reduction system includes: a diffuser assembly and a vehicle control unit; the vehicle control unit; The vehicle control unit is used to collect the vehicle speed and send the speed to the diffuser assembly; The diffuser assembly is used to control the diffuser body to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

12. A vehicle, characterized in that: Includes the wind resistance reduction system as claimed in claim 11.

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