A rear bumper, a method and a device for determining rear bumper design parameters

Abstract

The present invention discloses a rear bumper, a method and a device for determining rear bumper design parameters. By acquiring a preset eye point position at the rear of a vehicle and a bottom contour line of a muffler, a tangent line between the eye point position and the bottom contour line is determined as a rear view shielding line. When there is an intersection between a lower slope of the rear bumper and the rear view shielding line, it can be determined that the lower slope of the rear bumper can completely shield the muffler. When the lower slope is not greater than a preset departure angle, it can be determined that the lower slope of the rear bumper meets the vehicle's passability requirements, indicating that the lower slope meets the design parameters of the rear bumper. The lower slope is determined as the design parameters of the rear bumper to accurately shield the muffler. The method improves the accuracy of the rear bumper design parameters and the perceived quality of the rear of the vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle rear bumper design, and in particular to a rear bumper, and a method and device for determining rear bumper design parameters. Background Art

[0002] At present, according to the space conditions at the bottom of the car, the outer cover of the muffler is mostly processed into a tile shape or rolled into a pot shape. The outer cover of the pot-shaped muffler is formed by a round mandrel and the outer cover material is bitten or welded to be installed as a whole, and the welded parts are installed into the interface. The pot-shaped muffler consists of an inner tube, a steering elbow and an intermediate bottom plate, and then the outer bottom plate is connected to the outer cover by grooving or welding. Due to the large size of the muffler, its total volume is usually 8 to 12 times the engine displacement, and the space conditions at the bottom of the car are complicated. As a result, after the muffler of the vehicle is installed, the muffler can be observed from the rear of the vehicle. The exposed, that is, the lower edge of the rear bumper does not completely cover the muffler. The main reason is that accurate design parameters cannot be obtained during the design of the rear bumper.

[0003] Therefore, how to determine the design parameters of the rear bumper to accurately cover the muffler is a technical problem that needs to be solved urgently. Summary of the invention

[0004] A rear bumper, a method for determining rear bumper design parameters and a device of the present invention can determine the design parameters of the rear bumper to accurately shield the muffler.

[0005] The embodiment of the present invention provides the following solution:

[0006] In a first aspect, an embodiment of the present invention provides a method for determining design parameters of a rear bumper, the method comprising:

[0007] Obtain the preset eye point position at the rear of the vehicle and the bottom contour line of the muffler;

[0008] Determine a tangent line between the eye point position and the bottom contour line as a backsight shielding line;

[0009] If a lower slope of the rear bumper and the rear view shielding line have an intersection, and the lower slope is not greater than a preset departure angle, the lower slope is determined as a design parameter of the rear bumper.

[0010] In an optional embodiment, after determining the tangent line between the eye point position and the bottom contour line as the backsight shielding line, the method further includes:

[0011] If there is no intersection between the lower slope of the rear bumper of the vehicle and the rear view shielding line, the lower edge of the lower slope is extended to the intersection with the rear view shielding line to obtain an extended surface;

[0012] Design parameters of the rear bumper are obtained according to the lower inclined surface and the extended surface.

[0013] In an optional embodiment, the eye point position includes an eye point height and an eye point distance; and obtaining a preset eye point position behind the vehicle includes:

[0014] The eye point height and eye point distance of the rear vehicle driver are obtained, wherein the eye point height is the vertical height from the eye point of the rear vehicle driver to the ground, and the eye point distance is the horizontal distance from the eye point of the rear vehicle driver to the rear bumper of the front vehicle.

[0015] In an optional embodiment, obtaining the eye point height of the driver of the following vehicle includes:

[0016] Obtaining calculated eye point heights of a plurality of different vehicle models, wherein the plurality of different vehicle models at least include a sedan model and an SUV model;

[0017] The eye point height of the driver of the rear vehicle is obtained according to the minimum value of the plurality of eye point calculated heights.

[0018] In an optional embodiment, obtaining the eye point distance of the driver of the following vehicle includes:

[0019] Obtain the safe following speed and braking response time of the following vehicle;

[0020] Obtaining a safe following distance according to the safe following speed and the braking response time;

[0021] The eye point distance of the driver of the rear vehicle is obtained according to the sum of the safe following distance and the preset eye point distance, wherein the preset eye point distance is the horizontal distance from the eye point of the driver of the rear vehicle to the front of the rear vehicle.

[0022] In an optional embodiment, the eye point height is 1.2 m, and the eye point distance is 7.5 m.

[0023] In a second aspect, an embodiment of the present invention further provides a rear bumper, which is obtained by determining any one of the methods described in the first aspect.

[0024] In a third aspect, an embodiment of the present invention further provides a device for determining design parameters of a rear bumper, the device comprising:

[0025] An acquisition module, used for acquiring a preset eye point position at the rear of the vehicle and a bottom contour line of the muffler;

[0026] A first determining module, configured to determine a tangent line between the eye point position and the bottom contour line as a rear view shielding line;

[0027] The second determination module is used to determine the lower slope of the rear bumper as the design parameter of the rear bumper when there is an intersection between the lower slope of the rear bumper and the rear view shielding line and the lower slope is not greater than a preset departure angle.

[0028] In a fourth aspect, an embodiment of the present invention further provides an electronic device, comprising a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the first aspect.

[0029] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0030] Compared with the prior art, the rear bumper, the method and device for determining the design parameters of the rear bumper provided by the present invention have the following advantages:

[0031] The present invention obtains a preset eye point position at the rear of the vehicle and a bottom contour line of the muffler, and determines the tangent line between the eye point position and the bottom contour line as a rear view shielding line. When there is an intersection between the lower slope of the rear bumper and the rear view shielding line, it can be determined that the lower slope of the rear bumper can completely shield the muffler. When the lower slope is not greater than a preset departure angle, it can be determined that the lower slope of the rear bumper meets the vehicle's passability requirements, indicating that the lower slope meets the design parameters of the rear bumper. The lower slope is determined as the design parameters of the rear bumper to accurately shield the muffler. The method improves the accuracy of the rear bumper design parameters and the perceived quality of the rear of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A flowchart of a method for determining rear bumper design parameters provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a rear view shielding line provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the eye point height of a driver of a rear vehicle is provided for an embodiment of the present invention;

[0036] Figure 4A schematic diagram of the eye point position of the driver of a rear vehicle is provided for an embodiment of the present invention;

[0037] Figure 5 A schematic structural diagram of a device for determining rear bumper design parameters provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.

[0039] See also Figure 1 , Figure 1 A flowchart of a method for determining rear bumper design parameters provided by an embodiment of the present invention, the method comprising:

[0040] S11, obtaining a preset eye point position at the rear of the vehicle and a bottom contour line of the muffler.

[0041] Specifically, the eye point position is based on the observation point set by people in different scenes. In the scene of standing observation, it can be determined according to the average height of the standing human body and the horizontal distance of the observed vehicle. It can be understood that when the horizontal distance of the observed vehicle is too large, the observed vehicle will appear blurred due to the large viewing distance; when the horizontal distance of the observed vehicle is too small, the muffler at the rear of the vehicle cannot be observed due to the small viewing distance. Therefore, the eye point position can be determined by the eye point height of the standing person and the visual range of the viewing distance. For example, it can be set to a horizontal distance of 7-20m and a height distance of 1.4-1.8m from the rear of the vehicle. Please refer to Figure 2 The bottom contour line 2 represents the installation position and appearance structure of the muffler at the rear of the vehicle, which can be determined by the muffler 3D data of the vehicle.

[0042] In specific implementation, the vehicle usually includes a parked state and a driving state. When the driver controls the rear vehicle to be in a driving state, he will observe the rear end of the front vehicle while observing the road conditions. If the muffler is exposed, it will lead to a low perceived quality evaluation of the rear end of the vehicle.

[0043] In a specific implementation, the eye point position includes an eye point height and an eye point distance; obtaining a preset eye point position behind the vehicle includes:

[0044] The eye point height and eye point distance of the rear vehicle driver are obtained, wherein the eye point height is the vertical height from the eye point of the rear vehicle driver to the ground, and the eye point distance is the horizontal distance from the eye point of the rear vehicle driver to the rear bumper of the front vehicle.

[0045] Specifically, the eye point height and eye point distance of the driver of the rear vehicle represent the observation point of the driver of the rear vehicle when the rear vehicle is in driving state, and can be determined after analyzing the data of the following distance of the rear vehicle. The determined eye point height is 1.2m and the eye point distance is 7.5m.

[0046] In a specific implementation, obtaining the eye point height of the driver of the following vehicle includes:

[0047] The eye point calculated heights of a plurality of different vehicle models are obtained, wherein the plurality of different vehicle models at least include a sedan model and an SUV model; and the eye point height of the driver of the rear vehicle is obtained according to a minimum value of the plurality of eye point calculated heights.

[0048] For details, please refer to Figure 3 The eye point calculation height of different models can be determined according to GB11562-2014 "Driver's forward field of vision requirements and measurement methods", and the rear driver's lower field of vision reference eye point V2 (i.e. eye point position) has coordinates of X+65mm, Y-5mm, Z+689mm at point R of the human body.

[0049] The eye point calculation height Ha of a sedan model is:

[0050] Ha=H1(589)+H2(230~270)+H3(140)+H4(140)=1099~1139mm;

[0051] The eye point calculation height Hb of SUV models is:

[0052] Hb=589+(270~370)+140+180=1179~1279mm.

[0053] The minimum value among the multiple eye point calculated heights is 1099 mm, and the eye point height of the rear vehicle driver is rounded off to 1100 mm (ie 1.1 m).

[0054] In a specific implementation, obtaining the eye point distance of the driver of the following vehicle includes:

[0055] Obtain the safe following speed and braking response time of the rear vehicle; obtain the safe following distance based on the safe following speed and the braking response time; obtain the eye point distance of the rear vehicle driver based on the sum of the safe following distance and the preset eye point distance, wherein the preset eye point distance is the horizontal distance from the eye point of the rear vehicle driver to the front of the rear vehicle.

[0056] For details, please refer to Figure 4The braking response time represents the time that the rear vehicle brakes without causing an accident with the front vehicle. The safe following distance can be obtained by multiplying the safe following speed and the braking response time. The safe following distance represents the safe distance between the rear vehicle and the front vehicle during driving. The safe following distance calculated for sedan models is 5m. The preset eye point distance can be determined based on the corresponding model data of the rear vehicle model. For example, in sedan models, it is usually determined to be 2.5m, and the eye point distance of the rear vehicle driver is 7.5m.

[0057] S12: Determine a tangent line between the eye point position and the bottom contour line as a rear-view shielding line.

[0058] For details, please continue to refer to Figure 2 The rear view shielding line 3 represents the boundary of the muffler shielded when the rear of the vehicle is observed at the eye point position. The rear view shielding line can be obtained by drawing a tangent line to the bottom contour line based on the eye point position.

[0059] S13. If a lower slope of the rear bumper intersects the rear view shielding line, and the lower slope is not greater than a preset departure angle, the lower slope is determined as a design parameter of the rear bumper.

[0060] Specifically, the structure of the rear bumper usually includes a vertical surface and a lower inclined surface. The vertical surface is used to shield the anti-collision beam at the rear of the vehicle, and the lower inclined surface is used to shield the muffler. Because the rear bumper needs to have the function of improving the aerodynamic characteristics of the vehicle, the vertical surface and the lower inclined surface are usually set as curved surface structures, and a convex structure for diverting air is set along its length. If the lower inclined surface of the rear bumper intersects with the rear-view shielding line, it means that when observing the muffler at the eye point position, the lower inclined surface can completely shield it, meeting the requirement of shielding the muffler. The lower inclined surface is not greater than the preset departure angle, which means that the lower inclined edge meets the vehicle's passability requirements, and the lower inclined surface is determined as the design parameter of the rear bumper.

[0061] In a specific implementation, after determining the tangent line between the eye point position and the bottom contour line as the backsight shielding line, the method further includes:

[0062] If there is no intersection between the lower slope of the rear bumper of the vehicle and the rear view shielding line, the lower edge of the lower slope is extended to the intersection with the rear view shielding line to obtain an extended surface; the design parameters of the rear bumper are obtained based on the lower slope and the extended surface.

[0063] Specifically, if there is no intersection between the lower slope and the rear-view shielding line, it means that the lower slope does not completely block the muffler, and the lower slope does not meet the design requirements of the rear bumper. The lower edge of the lower slope is extended to the intersection with the rear-view shielding line to obtain an extended surface, and the muffler is shielded by the lower slope and the extended surface. The extension direction of the extended surface can be the same as the rear-view shielding line, or it can be determined by combining the aerodynamics and departure angle requirements of the rear bumper. The design parameters obtained by the lower slope and the extended surface can fully meet the design requirements of the rear bumper.

[0064] Based on the same method concept as the determination method, an embodiment of the present invention further provides a rear bumper, and the rear bumper is obtained by determining by any method described in the determination method.

[0065] Based on the same method concept as the determination method, the embodiment of the present invention also provides a device for determining the design parameters of the rear bumper, see Figure 5 , the device comprises:

[0066] An acquisition module 501 is used to acquire a preset eye point position behind the vehicle and a bottom contour line of the muffler;

[0067] A first determining module 502, configured to determine a tangent line between the eye point position and the bottom contour line as a backsight shielding line;

[0068] The second determination module 503 is used to determine the lower slope of the rear bumper as the design parameter of the rear bumper when there is an intersection between the lower slope of the rear bumper and the rear view shielding line and the lower slope is not greater than a preset departure angle.

[0069] In an optional embodiment, the device further includes:

[0070] A first obtaining module is used for extending the lower edge of the lower inclined surface to an intersection with the rear view shielding line when there is no intersection between the lower inclined surface of the rear bumper of the vehicle and the rear view shielding line, so as to obtain an extended surface;

[0071] The second obtaining module is used to obtain the design parameters of the rear bumper according to the lower inclined surface and the extended surface.

[0072] In an optional embodiment, the eye point position includes an eye point height and an eye point distance; and the acquisition module includes:

[0073] The acquisition submodule is used to acquire the eye point height and eye point distance of the rear vehicle driver, wherein the eye point height is the vertical height from the eye point of the rear vehicle driver to the ground, and the eye point distance is the horizontal distance from the eye point of the rear vehicle driver to the rear bumper of the front vehicle.

[0074] In an optional embodiment, the acquisition submodule includes:

[0075] A first acquisition unit is used to acquire eye point calculated heights of a plurality of different vehicle models, wherein the plurality of different vehicle models at least include a sedan model and an SUV model;

[0076] The first obtaining unit is used to obtain the eye point height of the driver of the rear vehicle according to the minimum value of the plurality of eye point calculated heights.

[0077] In an optional embodiment, the acquisition submodule includes:

[0078] The second acquisition unit is used to acquire the safe following speed and braking response time of the rear vehicle;

[0079] A second obtaining unit, configured to obtain a safe following distance according to the safe following speed and the braking response time;

[0080] The third obtaining unit is used to obtain the eye point distance of the driver of the rear vehicle according to the sum of the safe following distance and the preset eye point distance, wherein the preset eye point distance is the horizontal distance from the eye point of the driver of the rear vehicle to the front of the rear vehicle.

[0081] Based on the same method concept as the determination method, an embodiment of the present invention also provides an electronic device, including a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the determination method.

[0082] Based on the same method concept as the determination method, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of any one of the methods described in the determination method are implemented.

[0083] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0084] By obtaining the preset eye point position at the rear of the vehicle and the bottom contour line of the muffler, the tangent line between the eye point position and the bottom contour line is determined as the rear view shielding line. When there is an intersection between the lower slope of the rear bumper and the rear view shielding line, it can be determined that the lower slope of the rear bumper can completely shield the muffler. When the lower slope is not greater than the preset departure angle, it can be determined that the lower slope of the rear bumper meets the vehicle's passability requirements, indicating that the lower slope meets the design parameters of the rear bumper. The lower slope is determined as the design parameters of the rear bumper to accurately shield the muffler. This method improves the accuracy of the rear bumper design parameters and the perceived quality of the rear of the vehicle, solves the comprehensive problem of muffler exposure and meeting the departure angle, and gives the rear bumper a clear lower boundary definition.

[0085] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (modules, systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0087] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0089] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0090] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for determining rear bumper design parameters, characterized in that: The method comprises: Obtain the preset eye point position at the rear of the vehicle and the bottom contour line of the muffler; Determine a tangent line between the eye point position and the bottom contour line as a backsight shielding line; If the lower slope of the rear bumper and the rear view shielding line have an intersection, and the lower slope is not greater than a preset departure angle, the lower slope is determined as a design parameter of the rear bumper; After determining the tangent line between the eye point position and the bottom contour line as the rear view shielding line, the method further includes: If there is no intersection between the lower slope of the rear bumper of the vehicle and the rear view shielding line, the lower edge of the lower slope is extended to the intersection with the rear view shielding line to obtain an extended surface; The design parameters of the rear bumper are obtained according to the lower inclined surface and the extended surface.

2. The method for determining rear bumper design parameters according to claim 1, characterized in that: The eye point position includes an eye point height and an eye point distance; the step of obtaining a preset eye point position behind the vehicle includes: The eye point height and eye point distance of the rear vehicle driver are obtained, wherein the eye point height is the vertical height from the eye point of the rear vehicle driver to the ground, and the eye point distance is the horizontal distance from the eye point of the rear vehicle driver to the rear bumper of the front vehicle.

3. The method for determining rear bumper design parameters according to claim 2, characterized in that: Get the eye point height of the driver of the following vehicle, including: Obtaining calculated eye point heights of a plurality of different vehicle models, wherein the plurality of different vehicle models at least include a sedan model and an SUV model; The eye point height of the driver of the rear vehicle is obtained according to the minimum value of the plurality of eye point calculated heights.

4. The method for determining rear bumper design parameters according to claim 2, characterized in that: Get the eye point distance of the driver of the following vehicle, including: Obtain the safe following speed and braking response time of the following vehicle; Obtaining a safe following distance according to the safe following speed and the braking response time; The eye point distance of the driver of the rear vehicle is obtained according to the sum of the safe following distance and the preset eye point distance, wherein the preset eye point distance is the horizontal distance from the eye point of the driver of the rear vehicle to the front of the rear vehicle.

5. The method for determining rear bumper design parameters according to claim 2, characterized in that: The eye point height is 1.2 m, and the eye point distance is 7.5 m.

6. A rear bumper, characterized in that: The rear bumper is obtained by the method described in any one of claims 1-5.

7. A device for determining rear bumper design parameters, characterized in that: The device is a device corresponding to any one of the determination methods of claims 1 to 5; the device comprises: An acquisition module, used for acquiring a preset eye point position at the rear of the vehicle and a bottom contour line of the muffler; A first determining module, configured to determine a tangent line between the eye point position and the bottom contour line as a rear view shielding line; The second determination module is used to determine the lower slope of the rear bumper as the design parameter of the rear bumper when there is an intersection between the lower slope of the rear bumper and the rear view shielding line and the lower slope is not greater than a preset departure angle.

8. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory is coupled to the processor and stores instructions, and when the instructions are executed by the processor, the electronic device executes the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 5 are implemented.

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