Method for selecting electric bicycle target and electric bicycle target

Abstract

The present invention relates to the field of intelligent network test equipment, and specifically to a method for selecting an electric bicycle target and an electric bicycle target. The selection method includes: drawing a coordinate system and multiple angle lines, with an interval of 30 degrees between two adjacent angle lines; placing a test object at the origin of the coordinate system; the test object includes a to-be-selected electric bicycle target and a reference object; controlling a millimeter-wave radar vehicle to travel on the angle line and the set distance respectively, and collecting radar reflection data of the test object in real time; the driving range of the millimeter-wave radar vehicle on a single angle line is within 50m from the origin, and the set distance is 30m from the origin; according to the radar reflection data, the required electric bicycle target is determined. The present invention covers common scenarios, and can perform accurate and repeatable measurements on the test object. The radar characteristics of the screened electric bicycle target meet the standard requirements and meet the intelligent network test requirements.

Description

Technical Field

[0001] The present invention relates to the field of intelligent network connection test equipment, and in particular to a method for selecting an electric bicycle target and an electric bicycle target. Background Art

[0002] With the continuous development and progress of my country's automobile industry, active safety technology has gradually been applied to various mainstream models, and is developing in the direction of expanding the scope of application and deepening technology. In the active safety testing technology of automobiles, targets are usually used to simulate real road traffic participants, reproduce the characteristics of typical traffic participants, and participate in the active safety performance evaluation of vehicles as key test equipment to improve the safety performance of automobiles.

[0003] However, the current research system for electric bicycle targets is fragmented and limited to research on related technologies with reference to mainstream targets. It has not formed mature target products that can be widely promoted in the industry, and it is difficult to achieve independent control in the field of active safety test equipment.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The object of the present invention is to provide a method for selecting an electric bicycle target and an electric bicycle target, so as to solve the problem of lack of autonomous and controllable mature targets in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a method for selecting an electric bicycle target, comprising:

[0008] Draw a coordinate system and multiple angle lines, with an interval of 30 degrees between two adjacent angle lines;

[0009] Placing a test object at the origin of the coordinate system; the test object includes a target electric bicycle to be selected and a reference object;

[0010] The millimeter-wave radar vehicle is controlled to travel on the angle line and the set distance respectively, and radar reflection data of the test object is collected in real time; the driving range of the millimeter-wave radar vehicle on a single angle line is within 50 meters from the origin, and the set distance is 30 meters from the origin;

[0011] The desired electric bicycle target is determined according to the radar reflection data.

[0012] Furthermore, before controlling the millimeter wave radar vehicle to travel on the angle line and the set distance respectively and collecting radar reflection data of the test object in real time, the method further includes:

[0013] A corner reflector is placed at the origin of the coordinate system to calibrate the driving track of the millimeter wave radar vehicle; the surface of the corner reflector is covered with a reflective layer.

[0014] Furthermore, the angular drive deviation of the millimeter wave radar vehicle is less than 2 degrees, and the longitudinal or lateral positioning accuracy is <5 cm;

[0015] The millimeter wave radar vehicle includes a millimeter wave radar, and the height of the millimeter wave radar is 50 cm ± 10 cm;

[0016] The center height of the corner reflector is 50 cm ± 0.5 cm, the reflection plane of the corner reflector is parallel to the receiving plane of the millimeter wave radar, the center lines of the two coincide, and the error is controlled within ± 1°.

[0017] Furthermore, the speed of the millimeter wave radar vehicle is 5 km / h.

[0018] Further, determining the desired electric bicycle target object according to the radar reflection data includes:

[0019] It is determined whether the difference between the radar reflection data of the to-be-selected electric bicycle target object and the radar reflection data of the reference object is within a set threshold. If so, the target object is determined to be the desired electric bicycle target object.

[0020] In a second aspect, the present invention provides an electric bicycle target object obtained by the above-mentioned selection method, comprising a body, and a front wheel assembly, a frame, a handlebar assembly, a front seat and a rear wheel assembly connected to the body by magnetic buckles, wherein the main materials of the body, the front wheel assembly, the frame, the handlebar assembly, the front seat and the rear wheel assembly are all plastic, and the exposed surfaces are covered with a reflective layer.

[0021] Further, the front wheel assembly includes a front wheel, and the rear wheel assembly includes a rear wheel and a rear seat; the distance between the wheel axle of the front wheel and the wheel axle of the rear wheel is 1000-1040 mm; the diameter of the front wheel or the rear wheel is 360-380 mm, and the width is 55-65 mm; the height of the rear seat is 580-620 mm;

[0022] The vehicle body includes a footrest pedal, and the ground clearance of the footrest pedal is 140-180 mm;

[0023] The total height of the handlebar assembly is 1005-1045 mm; the handlebar assembly includes a handlebar, and the inclination angle of the handlebar is 17.5-27.5 degrees;

[0024] The front seat height is 715-740 mm.

[0025] Furthermore, the target object also includes a rider dummy, and the rider dummy is respectively connected to the handlebar assembly and the front seat by using magnetic buckles.

[0026] Furthermore, the rider dummy has a shoulder width of 410-430 mm, a knee width of 530-550 mm, a hand width of 620-640 mm, a helmet width of 230-250 mm, a chest thickness of 200-220 mm, a torso length of 465-495 mm, a thigh length of 350-370 mm, a calf length of 370-390 mm, a foot length of 200-220 mm, and a back curvature radius of 1220-1240 mm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The method for selecting an electric bicycle target provided by the present invention draws a coordinate system and multiple angle lines, then places the test object at the origin of the coordinate system, and then controls the millimeter wave radar vehicle to travel on the angle lines and set distances respectively, collects radar reflection data of the test object in real time, and finally determines the required electric bicycle target according to the radar reflection data. The method is based on the millimeter wave radar vehicle driving on specific angle lines and set distances respectively, respectively collecting radar reflection data of the selected electric bicycle target and the reference object, and determining the required electric bicycle target based on the data, covering common scenarios, and being able to perform accurate and repeatable measurements on the test object. The radar characteristics of the selected required electric bicycle target meet the standard requirements and meet the requirements of intelligent network connection testing. Therefore, the method and the obtained electric bicycle target break the monopoly of a few foreign manufacturers on the domestic target market and fill the domestic gap of electric bicycle targets that meet Chinese characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a schematic flow chart of the method for selecting an electric bicycle target object in Example 1;

[0031] Figure 2 is a schematic diagram of the coordinate system and angle lines in Example 1;

[0032] Figure 3 is a schematic diagram of the structural decomposition of the electric bicycle target object in Example 2;

[0033] Figure 4 is the size of the electric bicycle target in Example 2 Figure 1 ;

[0034] Figure 5 is the size of the electric bicycle target in Example 2 Figure 2 .

[0035] Icons: a-body; b-front wheel assembly; c-frame; d-handlebar assembly; e-front seat; f-rear wheel assembly; g-rider dummy. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Since the radar reflection characteristics involved in active safety targets are millimeter-wave radar RCS reflection characteristics, the main factors affecting the radar cross-sectional area of ​​the target are divided into three parts: first, the shape and directivity of the object. Since the reflection of electromagnetic waves follows the principle of "the angle of incidence equals the angle of reflection", if the surface shape of the object is in a horizontal plane with the radar emission source, the radar wave will be reflected to other directions, reducing the echo received by the radar receiving antenna, which has a great impact on the RCS value; second, the reflectivity of the object. Not all electromagnetic waves irradiated on the surface of the object will be reflected, and some will be absorbed by the object; third, the geometric cross-sectional size of the object. The geometric cross-sectional size of the object is also one of the factors affecting the reflected echo. For objects without stealth design, the irregular shape of the surface of the object is usually random, so the reflection directionality is also random. The larger the object of the same shape, the larger the geometric cross-sectional area and the larger the reflection cross-sectional area. Therefore, high requirements are placed on the structure and parameters of the target object. The present invention selects typical electric bicycles based on the sales volume of electric bicycles, obtains the dimensions of each component of the electric bicycle target object and forms a model diagram, and develops a test plan for the radar reflection characteristics of electric bicycles. The radar reflection characteristics of electric bicycles are verified through the processes of test site selection, test object and test scene construction, millimeter-wave radar vehicle calibration, and test result analysis.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides a method for selecting an electric bicycle target, comprising the following steps:

[0042] S110, drawing a coordinate system and a plurality of angle lines, with an interval of 30 degrees between two adjacent angle lines.

[0043] It should be noted that the convergence point of the above multiple angle lines is the origin of the above coordinate system, that is to say, take the origin of the coordinate system as the starting point, take the positive direction of the x-axis of the coordinate system as the starting angle line (0 degrees), and then draw an angle line every 30 degrees. The angle line can be drawn from 0 degrees to 180 degrees (such as Figure 2 as shown).

[0044] Before S110, the following steps may be optionally included: selecting a test site, wherein there are no other objects or buildings in the test area of ​​the selected test site, the ground is covered with tarmac or concrete, the test area is flat and dry, and there are no metals or other strong radar reflective components on the ground and in the surrounding areas of the test area.

[0045] S120, placing a test object at the origin of the coordinate system; the test object includes a target electric bicycle to be selected and a reference object.

[0046] The above-mentioned target electric bicycles are targets that meet the requirements of relevant regulations and are constructed with reference to electric vehicle brands with a relatively high market share. The reference objects are actual electric bicycles.

[0047] S130, control the millimeter-wave radar vehicle to travel on the angle line and the set distance respectively, and collect radar reflection data of the test object in real time; the driving range of the millimeter-wave radar vehicle on the single angle line is within 50m from the origin, and the set distance is 30m from the origin.

[0048] The above-mentioned millimeter-wave radar vehicle can test the RCS value of the radar reflection characteristic of the test object. It can be equipped with a sensor platform (composed of a millimeter-wave radar reflection characteristic unit), and use differential GPS (accuracy: 2 cm), automatic steering and drive units to control the position and direction of the millimeter-wave radar vehicle relative to the test object, and move at a set speed and according to an automatically planned path.

[0049] In an optional implementation, before controlling the millimeter wave radar vehicle to travel on the angle line and the set distance respectively to collect radar reflection data of the test object in real time, the method further includes:

[0050] The corner reflector is placed at the origin of the coordinate system to calibrate the driving track of the millimeter wave radar vehicle; the surface of the corner reflector is covered with a reflective layer. This embodiment can be calibrated before the millimeter wave radar vehicle is used to ensure that the driving track of the radar vehicle can follow the set track, thereby improving the reliability of testing and data collection.

[0051] In an optional implementation, the angular drive deviation of the millimeter wave radar vehicle is less than 2 degrees, and the longitudinal or lateral positioning accuracy is <5 cm.

[0052] The millimeter wave radar vehicle includes a millimeter wave radar, and the height of the millimeter wave radar is 50 cm ± 10 cm;

[0053] The center height of the corner reflector is 50 cm ± 0.5 cm, the reflection plane of the corner reflector is parallel to the receiving plane of the millimeter wave radar, the center lines of the two coincide, and the error is controlled within ± 1°.

[0054] It should be noted that the above height and center height both refer to the height from the ground. The material of the above reflection layer can be an absorbing material or a metal foil.

[0055] In an optional implementation, the speed of the millimeter wave radar vehicle is 5 km / h.

[0056] In S130, two testing methods are adopted: fixed angle (i.e. the millimeter-wave radar car travels on the angle line) and fixed distance (i.e. the millimeter-wave radar car travels at a set distance), which can cover common usage scenarios.

[0057] S140: Determine the desired electric bicycle target object according to the radar reflection data.

[0058] In an optional implementation, determining the desired electric bicycle target object according to the radar reflection data includes:

[0059] It is determined whether the difference between the radar reflection data of the to-be-selected electric bicycle target object and the radar reflection data of the reference object is within a set threshold. If so, the target object is determined to be the desired electric bicycle target object.

[0060] The above-mentioned "set threshold" can be selected as ±5dBsm. In actual testing, corresponding radar reflection data will be collected at each angle line and set distance. It is preferred to collect valid data three times at each angle line and set distance and then take the average as the required data. When the difference between each required data and the radar reflection data of the reference object is within the set threshold, the selected electric bicycle target corresponding to the test is determined to be the required electric bicycle target.

[0061] The method for selecting the electric bicycle target of this embodiment draws a coordinate system and multiple angle lines, then places the test object at the origin of the coordinate system, and then controls the millimeter wave radar vehicle to travel on the angle lines and set distances respectively, collects radar reflection data of the test object in real time, and finally determines the required electric bicycle target based on the radar reflection data. This method is based on the millimeter wave radar vehicle driving on specific angle lines and set distances respectively, collecting radar reflection data of the selected electric bicycle target and the reference object respectively, and determining the required electric bicycle target based on the data, covering common scenarios, and can accurately and repeatably measure the test object. The radar characteristics of the selected required electric bicycle target meet the standard requirements and meet the requirements of intelligent network connection testing. Therefore, this method and the obtained electric bicycle target break the monopoly of a few foreign manufacturers on the domestic target market and fill the domestic gap of electric bicycle targets that meet Chinese characteristics.

[0062] Example 2

[0063] like Figure 3As shown, this embodiment provides an electric bicycle target object, which is obtained by the selection method described in Example 1, including a body a, and a front wheel assembly b, a frame c, a handlebar assembly d, a front seat e and a rear wheel assembly f connected to the body a by magnetic buckles. The main materials of the body a, the front wheel assembly b, the frame c, the handlebar assembly d, the front seat e and the rear wheel assembly f are all plastic, and the exposed surfaces are covered with a reflective layer.

[0064] The electric bicycle target of this embodiment is obtained by the selection method described in Example 1, so it has at least the same advantages as Example 1. In addition, the body of the electric bicycle target is connected to the front wheel assembly, frame, handlebar assembly, front seat and rear wheel assembly by magnetic buckles, so the various parts can be separated after a collision to reduce the degree of damage to each part, and the purpose of reuse can be achieved. When a part is damaged, only the damaged part needs to be replaced, and the entire target can still be reused, thereby reducing costs. In addition, since the main material of the electric bicycle target is plastic (such as polycarbonate PC, polyethylene foam EPE), it is lighter and cheaper than a real car. The exposed surface refers to the surface that can be observed without disassembling the electric bicycle target. Covering the exposed surface with a reflective layer facilitates the simulation of the radar reflection of a real car and the collection of radar reflection data. The material of the reflective layer can be an absorbing material or a metal foil.

[0065] Specifically, the front wheel assembly includes a front wheel and a front wheel bracket, the rear wheel assembly includes a rear wheel bracket, a rear seat, a rear seat cover, a rear wheel, and a rear license plate; the handlebar assembly includes a handlebar and a headlight, and the vehicle body includes pedals, a support rod, a rest pedal, and a foot pedal.

[0066] In an optional embodiment, the front wheel assembly includes a front wheel, and the rear wheel assembly includes a rear wheel and a rear seat; the distance between the wheel axle of the front wheel and the wheel axle of the rear wheel is 1000-1040 mm; the diameter of the front wheel or the rear wheel is 360-380 mm, and the width is 55-65 mm; the height of the rear seat is 580-620 mm;

[0067] The vehicle body includes a footrest pedal, and the ground clearance of the footrest pedal is 140-180 mm;

[0068] The total height of the handlebar assembly is 1005-1045 mm; the handlebar assembly includes a handlebar, and the inclination angle of the handlebar is 17.5-27.5 degrees;

[0069] The front seat height is 715-740 mm.

[0070] In an optional embodiment, the target object further includes a rider dummy g, and the rider dummy f is respectively connected to the handlebar assembly d and the front seat e by using magnetic buckles.

[0071] Optionally, the rider dummy is composed of a filling material (foaming material and absorbing material) and a reflective layer.

[0072] In an optional embodiment, the rider dummy has a shoulder width of 410-430 mm, a knee width of 530-550 mm, a hand width of 620-640 mm, a helmet width of 230-250 mm, a chest thickness of 200-220 mm, a torso length of 465-495 mm, a thigh length of 350-370 mm, a calf length of 370-390 mm, a foot length of 200-220 mm, and a back curvature radius of 1220-1240 mm.

[0073] This embodiment realizes the key parameter setting of the domestic electric bicycle target object, and effectively fills the domestic gap of the electric bicycle target object that meets the characteristics of China.

[0074] See also Figure 4 and Figure 5 The figure shows the starting and ending points of the dimensions of each part of the above-mentioned electric bicycle target object, represented by serial numbers 1 to 35. The specific parts and values ​​are shown in Table 1.

[0075] Table 1 Geometric dimensions of electric bicycle targets

[0076] Serial number Location Minimum Maximum average value tolerance unit 1 Distance between front wheel axle and rear wheel axle 1000 1040 1020 ±20 mm 2 Front wheel diameter 360 380 370 ±10 mm 3 Rear wheel diameter 360 380 370 ±10 mm 4 Ground clearance of footrest pedal 140 180 160 ±20 mm 5 Wheel ground clearance 0 0 0 ±0 mm 6 Overall height 1550 1600 1575 ±25 mm 7 Rear height 580 620 600 ±20 mm 8 Handlebar height 1005 1045 1025 ±20 mm 9 Front seat height 715 740 725 ±15 mm 10 License plate height 380 400 390 ±10 mm 11 Rear reflector height 510 540 525 ±15 mm 12 Headlight height 910 930 920 ±10 mm 13 Side reflector height 265 285 275 ±10 mm 14 Cyclist dummy knee width 530 550 540 ±10 mm 15 Cyclist dummy foot width 320 330 325 ±5 mm 16 Cyclist dummy shoulder width 410 430 420 ±10 mm 17 Biker dummy hand width 620 640 630 ±10 mm 18 Helmet width 230 250 240 ±10 mm 19 Front wheel width 55 65 60 ±5 mm 20 Rear wheel width 55 65 60 ±5 mm 21 License plate width 170 180 175 ±5 mm 22 Cyclist dummy chest thickness 200 220 210 ±10 mm 23 Cyclist dummy torso length 465 495 480 ±15 mm 24 Cyclist dummy thigh length 350 370 360 ±10 mm 25 Cyclist dummy calf length 370 390 380 ±10 mm 26 Cyclist dummy foot length 200 220 210 ±10 mm 27 Cyclist dummy back curvature radius 1220 1240 1230 ±15 mm 28 Handlebar tilt angle 17.5 27.5 22.5 ±5 ° 29 Cyclist dummy torso tilt angle 7 17 12 ±5 ° 30 Cyclist dummy thigh tilt angle 10 20 15 ±5 ° 31 Cyclist dummy lower leg tilt angle 0 10 5 ±5 ° 32 Cyclist dummy foot angle -5 5 0 ±5 ° 33 License plate tilt angle 15 25 20 ±5 ° 34 Rear view cyclist dummy thigh angle 40 50 45 ±5 ° 35 Arm Angle 125 145 135 ±10 °

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. An electric bicycle target, characterized in that: The object is obtained by adopting the method for selecting an electric bicycle target, comprising a body, and a front wheel assembly, a frame, a handlebar assembly, a front seat and a rear wheel assembly connected to the body by magnetic buckles, wherein the body, the front wheel assembly, the frame, the handlebar assembly, the front seat and the rear wheel assembly are mainly made of plastic, and the exposed surfaces are all covered with a reflective layer; The front wheel assembly includes a front wheel, and the rear wheel assembly includes a rear wheel and a rear seat; the distance between the wheel axle of the front wheel and the wheel axle of the rear wheel is 1000-1040 mm; the diameter of the front wheel or the rear wheel is 360-380 mm, and the width is 55-65 mm; the height of the rear seat is 580-620 mm; The vehicle body includes a footrest pedal, and the ground clearance of the footrest pedal is 140-180 mm; The total height of the handlebar assembly is 1005-1045 mm; the handlebar assembly includes a handlebar, and the inclination angle of the handlebar is 17.5-27.5 degrees; The front seat height is 715-740mm; The method for selecting the electric bicycle target object comprises: Draw a coordinate system and multiple angle lines, with an interval of 30 degrees between two adjacent angle lines; Placing a test object at the origin of the coordinate system; the test object includes a target electric bicycle to be selected and a reference object; The millimeter-wave radar vehicle is controlled to travel on the angle line and the set distance respectively, and radar reflection data of the test object is collected in real time; the driving range of the millimeter-wave radar vehicle on a single angle line is within 50 meters from the origin, and the set distance is 30 meters from the origin; Determining the desired electric bicycle target object according to the radar reflection data; Before controlling the millimeter wave radar vehicle to travel on the angle line and the set distance respectively to collect radar reflection data of the test object in real time, the method further includes: Placing a corner reflector at the origin of the coordinate system to calibrate the driving track of the millimeter wave radar vehicle; the surface of the corner reflector is covered with a reflective layer; The angular drive deviation of the millimeter wave radar vehicle is less than 2 degrees, and the longitudinal or lateral positioning accuracy is less than 5cm; The millimeter wave radar vehicle includes a millimeter wave radar, and the height of the millimeter wave radar is 50 cm ± 10 cm; The center height of the corner reflector is 50 cm ± 0.5 cm, the reflection plane of the corner reflector is parallel to the receiving plane of the millimeter wave radar, the center lines of the two coincide, and the error is controlled within ± 1°; The target object also includes a rider dummy, and the rider dummy is respectively connected to the handlebar assembly and the front seat by magnetic buckles; The rider dummy has a shoulder width of 410-430 mm, a knee width of 530-550 mm, a hand width of 620-640 mm, a helmet width of 230-250 mm, a chest thickness of 200-220 mm, a torso length of 465-495 mm, a thigh length of 350-370 mm, a calf length of 370-390 mm, a foot length of 200-220 mm, and a back curvature radius of 1220-1240 mm. Determining the desired electric bicycle target object according to the radar reflection data includes: It is determined whether the difference between the radar reflection data of the to-be-selected electric bicycle target object and the radar reflection data of the reference object is within a set threshold. If so, the target object is determined to be the desired electric bicycle target object.

2. The electric bicycle target according to claim 1, characterized in that: The speed of the millimeter wave radar vehicle is 5km / h.

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