Wind resistance reducing device, method and system and vehicle

Abstract

The invention relates to a wind resistance reducing device, method and system and a vehicle, and relates to the technical field of vehicles. The wind resistance reducing device (10) comprises a telescopic piece (11) and a driving mechanism (12). The telescopic piece (11) is arranged at the tail part of the vehicle (1); the driving mechanism (12) is used for driving the telescopic piece (11) to be switched between an extending state and a retracting state relative to the vehicle (1); the length of the vehicle (1) when the telescopic piece (11) is in the stretching-out state is larger than the length of the vehicle (1) when the telescopic piece (11) is in the retracting state. As a result, it is possible to achieve 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 wind resistance reduction device, method, system and 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 to install a vehicle speed sensor on the vehicle body to sense the vehicle speed in real time and automatically adjust the vehicle height based on the speed to reduce wind resistance. Another related technology proposes a low wind resistance side skirt baffle, including a wheel cover, a wheel eyebrow, and a rear wheel spoiler. The wheel cover edge is provided with a wheel eyebrow, and a rear wheel spoiler and a side skirt baffle are provided under the wheel cover. The side skirt baffle is connected to the rear wheel spoiler and installed on the wheel cover to reduce the wind resistance of the whole vehicle. Summary of the invention

[0004] The present application provides a wind resistance reduction device, method, system and vehicle 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 wind resistance reduction device is provided, comprising: a telescopic member and a driving mechanism; the telescopic member is arranged at the rear of a vehicle; the driving mechanism is used to drive the telescopic member to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the telescopic member is in the extended state is greater than the length of the vehicle when the telescopic member is in the retracted state.

[0006] According to the above-mentioned technical means, the present application can accurately control the dynamic extension and retraction of the telescopic part. When the telescopic part is in the extended state, the length of the vehicle body is increased to reconstruct the airflow field structure, effectively suppressing the boundary layer separation and the formation of tail vortex, thereby reducing the drag coefficient of the whole vehicle. In addition, when the telescopic part is in the retracted state, the original beautiful shape of the vehicle can be maintained, satisfying the aesthetic needs of consumers for the appearance of the vehicle.

[0007] In one possible implementation, the telescopic member includes a rear bumper.

[0008] According to the above technical means, the present application can use the rear bumper as a telescopic part, which can achieve functional expansion without increasing the extra volume of the vehicle.

[0009] 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 telescopic member.

[0010] According to the above technical means, the present application can drive the telescopic member 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 telescopic member.

[0011] In a possible implementation, the wind resistance reduction device further includes: a guide structure; the guide structure is disposed on the vehicle and extends along the telescopic direction of the telescopic member; the telescopic member is slidably connected to the guide structure.

[0012] According to the above technical means, the present application can physically constrain the lateral displacement of the telescopic member through the guide structure, reduce the vibration and deflection during high-speed telescopic movement, and ensure the stability of the telescopic member during movement.

[0013] In one possible implementation, the guide structure includes a slide rail.

[0014] According to the above technical means, the present application can effectively suppress the vibration and deflection that may be generated by the telescopic parts when the vehicle moves at high speed through the slide rail.

[0015] In a possible implementation, the wind resistance reducing device further includes: a support plate; the guide structure and the telescopic member are slidably connected via the support plate.

[0016] According to the above technical means, the present application can use the support plate as a connecting carrier between the guide structure and the telescopic part, provide sliding support and a mechanical transmission path for the telescopic part, and ensure the stability of the telescopic part during movement.

[0017] In a possible implementation, the wind resistance reduction device further includes: a fastening bracket; the fastening bracket is used to fix the driving mechanism and the guide structure on the vehicle.

[0018] According to the above technical means, the present application can fix the driving mechanism and the guide structure on the vehicle through a bracket to ensure the stability of the telescopic member during movement.

[0019] According to a second aspect provided by the present application, a method for reducing wind resistance is provided, which is applied to the wind resistance reducing device in the first aspect, and the method includes: obtaining a vehicle speed; based on the vehicle speed, controlling the telescopic member to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the telescopic member is in the extended state is greater than the length of the telescopic member in the retracted state.

[0020] According to the above-mentioned technical means, the present application can accurately control the dynamic extension and retraction of the telescopic part based on the real-time vehicle speed signal of the vehicle. When the telescopic part is in the extended state, the length of the vehicle body is increased to reconstruct the airflow field structure, effectively suppressing boundary layer separation and tail vortex generation, thereby reducing the drag coefficient of the entire vehicle. In addition, when the telescopic part is in the retracted state, the original beautiful shape of the vehicle can be maintained, satisfying consumers' aesthetic needs for the vehicle's appearance.

[0021] In one possible implementation, based on the vehicle speed, the telescopic member 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 telescopic member 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 telescopic member is controlled to be in the retracted state.

[0022] According to the above technical means, the present application can extend the telescopic part when the vehicle is traveling at high speed to reduce wind resistance, and retract the telescopic part when the vehicle is traveling at a high speed to shorten the length of the vehicle body and increase the turning radius on narrow roads. In addition, by considering the time threshold, frequent extension and retraction caused by instantaneous fluctuations in vehicle speed can be avoided, and false trigger signals can be filtered out (such as temporary abnormalities in the vehicle speed sensor caused by bumpy road conditions).

[0023] In one possible implementation, controlling the telescopic member to be in the extended state includes: based on an extension parameter of the telescopic member when the telescopic member is in the extended state, controlling the telescopic member to be extended so that the vehicle satisfies a preset condition when the telescopic member is in the extended state; the extension parameter is determined based on the body structure of the vehicle.

[0024] According to the above technical means, the present application can ensure that the vehicle's wind resistance, stiffness, strength, etc. meet the normal driving conditions of the vehicle by determining the optimal extension parameters of the telescopic parts through the vehicle body structure.

[0025] In one possible implementation, the extension parameter includes at least one of an extension length, an extension angle, and a shape after extension.

[0026] According to 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 telescopic member is in the extended state, so as to reduce the vehicle's wind resistance.

[0027] According to the third aspect provided by the present application, a wind resistance reduction system is provided, which includes: a wind resistance reduction device 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 wind resistance reduction device; the wind resistance reduction device is used to control the telescopic part to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

[0028] According to the fourth aspect provided by the present application, a wind resistance reduction device is provided, including: an acquisition unit and a control unit; the acquisition unit is used to acquire the vehicle speed; the control unit is used to control the telescopic member 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 telescopic member is in the extended state is greater than the length of the telescopic member in the retracted state.

[0029] In one possible implementation, the control unit is specifically used to: control the telescopic member to be in the extended state when the vehicle speed is less than the speed threshold for a first duration greater than the duration threshold; and control the telescopic member to be in the retracted state when the vehicle speed is greater than or equal to the speed threshold for a second duration greater than the duration threshold.

[0030] In one possible implementation, the control unit is specifically used to: control the extension of the telescopic member based on an extension parameter of the telescopic member when the telescopic member is in the extended state, so that the vehicle meets a preset condition when the telescopic member is in the extended state; the extension parameter is determined based on the body structure of the vehicle.

[0031] According to a fifth aspect provided by the present application, a vehicle is provided, comprising the wind resistance reduction system in the third aspect.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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

[0037] 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.

[0038] Figure 1 is a schematic diagram of a hardware structure of a vehicle according to an exemplary embodiment;

[0039] Figure 2 is a schematic diagram of the hardware structure of a wind resistance reduction device according to an exemplary embodiment;

[0040] Figure 3 is a hardware structure diagram of a wind resistance reduction system according to an exemplary embodiment;

[0041] Figure 4 is a flow chart of a method for reducing wind resistance according to an exemplary embodiment;

[0042] Figure 5 is a side rear view of a vehicle rear end when a telescopic member is in an extended state according to an exemplary embodiment;

[0043] Figure 6 is a side rear view of a vehicle rear end when a telescopic member is in a retracted state according to an exemplary embodiment;

[0044] Figure 7 is a side view of the rear of a vehicle when a telescopic member is in an extended state according to an exemplary embodiment;

[0045] Figure 8 is a side view of the rear of a vehicle when a telescopic member is in a retracted state according to an exemplary embodiment;

[0046] Fig. 9 is a schematic diagram of a drag reduction process according to an exemplary embodiment;

[0047] Fig.10 is a block diagram of a wind resistance reduction device according to an exemplary embodiment;

[0048] Fig.11 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 mentioned in the background technology, in order to solve the problem in the related technology that it is impossible to achieve a lower wind resistance design while maintaining a beautiful shape, the present application provides a wind resistance reduction method, which is applied to a wind resistance reduction device. The wind resistance reduction device includes: a telescopic member and a driving mechanism. The method includes: the driving mechanism obtains the speed of the vehicle, and based on the speed, controls the telescopic member to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the telescopic member is in the extended state is greater than the length when the telescopic member is in the retracted state.

[0052] Based on this, the present application can accurately control the dynamic extension and retraction of the telescopic part based on real-time vehicle speed data. When the telescopic part is in the extended state, the length of the vehicle body is increased to reconstruct the airflow field structure, effectively suppressing boundary layer separation and tail vortex generation, thereby reducing the drag coefficient of the entire vehicle. In addition, when the telescopic part is in the retracted state, the original beautiful shape of the vehicle can be maintained, 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 It is a schematic diagram of the hardware structure of a vehicle 1 according to an exemplary embodiment.

[0056] In the embodiments of the present application, the vehicle may be a sedan, 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] Figure 2 It is a schematic diagram of the hardware structure of a wind resistance reduction device according to an exemplary embodiment.

[0058] In a possible implementation, the wind resistance reducing device 10 may include: a telescopic member 11 , a driving mechanism 12 , a guide structure 13 , a support plate 14 , and a fastening bracket 15 .

[0059] Optionally, the telescopic member 11 may be disposed at the rear of the vehicle 1 and connected to the output end of the driving mechanism 12 .

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

[0061] For ease of understanding, the present application takes the connection between a telescopic member and a driving mechanism 12 as an example for explanation.

[0062] Optionally, the telescopic member 11 may include a rear bumper of the vehicle 1. The present application does not impose any specific limitation on this.

[0063] Optionally, the driving mechanism 12 may include a telescopic motor. In the case where the driving mechanism 12 is a telescopic motor, the output end of the telescopic motor may be connected to the telescopic member 11 .

[0064] In a possible implementation, the driving mechanism 12 may be used to drive the telescopic member 11 to switch between an extended state and a retracted state relative to the vehicle 1 .

[0065] Specifically, the telescopic member 11 may be slidably connected to the guide structure 13 via the support plate 14. The driving mechanism 12 may drive the telescopic member 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 telescopic member 11.

[0066] 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 telescopic member 11 .

[0067] In a possible implementation manner, the fastening bracket 15 can be used to fix the driving mechanism 12 and the guide structure 13 on the vehicle 1 .

[0068] Figure 3 The figure is a schematic diagram of the hardware structure of a wind resistance reduction system according to an exemplary embodiment.

[0069] In a possible implementation, the wind resistance reduction system 30 may be deployed on a vehicle. The wind resistance reduction system 30 may include a wind resistance reduction device 31 , a vehicle control unit 32 , and a data acquisition unit 33 .

[0070] In a possible implementation, a communication connection may be established between the wind resistance reduction device 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.

[0071] In practical applications, the vehicle control unit 32 may be communicatively connected with one or more data acquisition units 33 .

[0072] 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.

[0073] Optional, Figure 3 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.

[0074] 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".

[0075] 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.

[0076] Figure 3 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 wind resistance reduction device 31. The wind resistance reduction device 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.

[0077] Optionally, Figure 3 The vehicle control unit 32 may be a terminal, a server, or other types of electronic equipment. Figure 3 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] For ease of understanding, the wind resistance reduction method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0082] Figure 4 is a flow chart of a method for reducing wind resistance according to an exemplary embodiment. Figure 4 As shown, the wind resistance reduction method can be applied to a wind resistance reduction device, and includes the following steps: S401-S402.

[0083] S401. Obtain the vehicle speed.

[0084] In a possible implementation, the wind resistance reduction device can be connected to the 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 wind resistance reduction device. The wind resistance reduction device can receive the speed sent by the vehicle control unit.

[0085] In a possible implementation, the wind resistance reduction device may be equipped with a speed sensor, and the wind resistance reduction device may obtain the current speed of the vehicle in real time based on the speed sensor.

[0086] S402: Based on the vehicle speed, control the telescopic member to switch between an extended state and a retracted state relative to the vehicle.

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

[0088] In one embodiment, the wind resistance reduction device can switch the state of the telescopic member based on the speed of the vehicle.

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

[0090] In another possible implementation, when the second duration when the vehicle speed is greater than or equal to the speed threshold is greater than the duration threshold, the telescopic member is controlled to be in a retracted state to keep the vehicle compact and facilitate flexible steering 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 wind resistance reduction device can switch the telescopic member state based on road condition information and vehicle speed.

[0094] In one possible implementation, the wind resistance reduction device 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 wind resistance reduction device can obtain the type of road condition ahead, congestion index, road grade, speed limit information, and traffic light information based on navigation information. The wind resistance reduction device can obtain weather conditions through vehicle-mounted sensors.

[0097] In one possible implementation, the wind resistance reduction device can determine the state of the telescopic component based on road condition information and vehicle speed, and control the telescopic component to switch its state.

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

[0099] Alternatively, the wind resistance reduction device can control the telescopic member to be in a retracted state when the vehicle is driving on a continuous curve on a mountain county road to avoid the longer body interfering with the turn.

[0100] Alternatively, the wind resistance reduction device can control the telescopic part to be in a retracted state when the vehicle speed is less than a speed threshold and the navigation shows frequent red lights, giving priority to ensuring passability.

[0101] Alternatively, the wind resistance reduction device may control the telescopic member to be in a retracted state when the front speed limit information is lower than a speed threshold.

[0102] For example, Figure 5 As shown, Figure 5 The figure is a side rear view of a vehicle rear end when a telescopic member is in an extended state according to an exemplary embodiment.

[0103] For example, Figure 6 As shown, Figure 6 The figure is a side rear view of a vehicle rear end when a telescopic member is in a retracted state according to an exemplary embodiment.

[0104] For example, Figure 7 As shown, Figure 7 The figure is a side view of the rear end of a vehicle when a telescopic member is in an extended state according to an exemplary embodiment.

[0105] For example, Figure 8 As shown, Figure 8 The figure is a side view of the rear end of a vehicle when a telescopic member is in a retracted state according to an exemplary embodiment.

[0106] based on Figure 5 and Figure 6 The comparison, and Figure 7 and Figure 8 It can be seen from the comparison that the length of the vehicle when the telescopic member is in the extended state is greater than the length when the telescopic member is in the retracted state.

[0107] In a possible implementation, the wind resistance reduction device can send the switched state of the telescopic component to the vehicle control unit when the state of the telescopic component is switched. The vehicle control unit can output the state of the telescopic component.

[0108] For example, the vehicle control unit can inform the user that the telescopic member is in the extended state by displaying on the instrument panel or announcing by voice that "wind resistance optimization mode has been activated".

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

[0110] In one possible implementation, the wind resistance reduction device may control the extension of the telescopic member based on an extension parameter of the telescopic member when the telescopic member is in the extended state, so that the vehicle meets a preset condition when the telescopic member is in the extended state.

[0111] The extension parameter is determined based on the body structure of the vehicle, and includes at least one of an extension length, an extension angle, and a shape after extension.

[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 wind resistance reduction device can perform a joint simulation of the wind resistance, stiffness, strength and NVH performance of the vehicle's telescopic parts in the extended and retracted states at the vehicle level to determine the extended length, extension angle, and shape after extension.

[0114] Exemplarily, 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 telescopic part is in a retracted state) and the extended shape (the telescopic part is in an extended state), and determining the minimum wind resistance target through parameter optimization (such as extension angle, extension length).

[0115] Structural performance simulation may include: stiffness (torsion / bending stiffness) and strength (fatigue life) analysis of the vehicle body structure in both extended / retracted states 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 telescopic parts, and optimizing the damping material layout to suppress resonance.

[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 drag reduction device can determine the extension amount of the telescopic member (e.g., 200 mm) based on the drag optimization result. The drag reduction device can perform a motion envelope analysis on the vehicle, define the minimum clearance between the telescopic member and the body sheet metal, diffuser, and exhaust system, and use topology optimization technology to adjust the layout between the telescopic member and other vehicle components to avoid interference from other vehicle components when the telescopic member moves.

[0120] In another possible implementation, the wind resistance reduction device can be based on the rigid-flexible coupling model of the vehicle to analyze the center of gravity shift of the vehicle caused by the extension of the telescopic member, so as to design a counterweight slider or a hydraulic balancing device to dynamically compensate for the change in the center of gravity of the vehicle.

[0121] Optionally, the wind resistance reduction device can be integrated with an active suspension control system to adjust the shock absorber damping in real time according to the state of the telescopic parts to suppress the fluctuation of the vehicle body pitch angle.

[0122] Based on the above technical solution, the present application can accurately control the dynamic extension and retraction of the telescopic part based on real-time vehicle speed data. When the telescopic part is in the extended state, the vehicle body length is increased to reconstruct the airflow field structure, effectively suppressing boundary layer separation and tail vortex generation, thereby reducing the drag coefficient of the entire vehicle. In addition, when the telescopic part is in the retracted state, the original beautiful shape of the vehicle can be maintained, satisfying consumers' aesthetic needs for the vehicle's appearance.

[0123] In some embodiments, Fig. 9 As shown, Fig. 9 It is a schematic diagram of a wind resistance reduction process according to an exemplary embodiment.

[0124] S901. Wake up the wind resistance reduction system after the vehicle is powered on.

[0125] In one possible implementation, the wind resistance reduction system is awakened, that is, the vehicle control unit and the wind resistance reduction device are awakened.

[0126] S902: The vehicle control unit sends a vehicle speed signal to the wind resistance reduction device.

[0127] In one possible implementation, the wind resistance reduction device may execute S903 or S905 based on the vehicle speed signal.

[0128] S903: The wind resistance reduction device determines that the first continuous time period during which the vehicle speed is less than the speed threshold is greater than the time threshold.

[0129] In a possible implementation, the wind resistance reduction device may execute S904 when the first duration of the vehicle speed being less than the speed threshold is greater than the duration threshold.

[0130] S904: The wind resistance reduction device controls the telescopic member to be in a retracted state.

[0131] In a possible implementation, after S904 is completed, S907 is executed.

[0132] S905: The wind resistance reduction device determines that the second continuous time period during which the vehicle speed is greater than or equal to the speed threshold is greater than the time threshold.

[0133] In a possible implementation, the wind resistance reduction device may execute S906 when the vehicle speed is greater than or equal to the speed threshold and the second duration is greater than the duration threshold.

[0134] S906: The wind resistance reduction device controls the telescopic member to be in a retracted state.

[0135] In a possible implementation, after S906 is completed, S907 is executed.

[0136] S907: The wind resistance reduction device sends the status of the telescopic component to the vehicle control unit.

[0137] S908: The vehicle control unit displays the status of the telescopic component to the user.

[0138] Fig.10 is a block diagram of a wind resistance reduction device according to an exemplary embodiment. Fig.10 The wind resistance reduction device includes: an acquisition unit 1001 and a control unit 1002.

[0139] In a possible implementation, the acquisition unit 1001 is used to acquire the speed of the vehicle.

[0140] In a possible implementation, the control unit 1002 is used to control the telescopic member to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

[0141] In a possible implementation, the control unit 1002 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 telescopic member 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 telescopic member to be in the retracted 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] Fig.11 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig.11 As shown, the electronic device includes but is not limited to: a processor 1101 and a memory 1102 .

[0144] The memory 1102 is used to store executable instructions of the processor 1101. It can be understood that the processor 1101 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.11 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig.11 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0146] The processor 1101 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 1102, and calling data stored in the memory 1102, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1101 may include one or more processing units. Optionally, the processor 1101 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 1101.

[0147] The memory 1102 may be used to store software programs and various data. The memory 1102 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 1102 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 1102 including instructions. The above instructions can be executed by a processor 1101 of an electronic device to implement the method in the above embodiment.

[0149] In actual implementation, Fig.10 The functions of the acquisition unit 1001 and the control unit 1002 can be obtained by Fig.11 The processor 1101 in the embodiment calls the computer program stored in the memory 1102 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 1101 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 wind resistance reduction device, characterized in that: The wind resistance reduction device (10) comprises: a telescopic member (11) and a driving mechanism (12); the telescopic member (11) is arranged at the rear of a vehicle (1); the driving mechanism (12) is used to drive the telescopic member (11) to switch between an extended state and a retracted state relative to the vehicle (1); the length of the vehicle (1) when the telescopic member (11) is in the extended state is greater than the length of the telescopic member (11) when it is in the retracted state.

2. The wind resistance reduction device according to claim 1, characterized in that: The telescopic member (11) comprises a rear bumper.

3. The wind resistance reduction device according to claim 2, characterized in that: The driving mechanism (12) comprises a telescopic motor; the telescopic motor is fixed to the vehicle (1), and the output end of the telescopic motor is connected to the telescopic member (11).

4. The wind resistance reducing device according to any one of claims 1 to 3, characterized in that: The wind resistance reduction device (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 telescopic member (11); the telescopic member (11) is slidably connected to the guide structure (13).

5. The wind resistance reduction device according to claim 4, characterized in that: The guide structure (13) comprises a slide rail.

6. The wind resistance reducing device according to claim 5, characterized in that: The wind resistance reduction device (10) further comprises: a support plate (14); The guide structure (13) and the telescopic member (11) are slidably connected via the support plate (14).

7. The wind resistance reducing device according to claim 5, characterized in that: The wind resistance reduction device (10) further comprises: a fastening bracket (15); The fastening bracket (15) is used to fix the driving mechanism (12) and the guiding structure (13) on the vehicle (1).

8. A method for reducing wind resistance, characterized in that: Applied to the wind resistance reducing device according to any one of claims 1 to 7, the method comprising: Get the vehicle speed; Based on the vehicle speed, the telescopic member is controlled to switch between an extended state and a retracted state relative to the vehicle; the length of the vehicle when the telescopic member is in the extended state is greater than the length of the vehicle when the telescopic member is in the retracted state.

9. The method according to claim 8, characterized in that The controlling the telescopic member 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 telescopic member 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 the duration threshold, the telescopic member is controlled to be in the retracted state.

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

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

12. A wind resistance reduction system, characterized in that: The wind resistance reduction system comprises: a wind resistance reduction device 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 wind resistance reduction device; The wind resistance reduction device is used to control the telescopic member to switch between an extended state and a retracted state relative to the vehicle based on the vehicle speed.

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

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