Automatic line drawing and point finding method for pedestrian protection test

Abstract

The invention relates to an automatic line-drawing and point-finding method for a pedestrian protection test, which is implemented based on an automatic line-drawing and point-finding device, and the automatic line-drawing and point-finding device comprises a line-drawing and point-finding sliding block with freedom degrees in the front-back direction, the up-down direction and the left-right direction, the line drawing and point finding sliding block is further provided with a front edge line drawing straight edge used for conducting front edge line drawing and point finding, a left side edge datum line drawing straight edge used for conducting left side edge datum line drawing and point finding, a right side edge datum line drawing straight edge used for conducting right side edge datum line drawing and point finding, a laser transmitter and a paintbrush. Compared with the prior art, automation of searching and marking of part of reference lines and impact point positions can be achieved, and meanwhile, compared with manual drawing, stability is better, efficiency is higher, and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile safety detection, and relates to an automatic line drawing and point finding method for pedestrian protection test. Background Art

[0002] With the rapid development of my country's automobile industry, the automobile penetration rate has reached a high level. The interaction between cars and pedestrians, the most vulnerable road users, is increasing, and the collisions between the two are also increasing. OEMs are also paying more attention to the development of vehicle pedestrian protection performance. Pedestrian protection tests are an important means to assist OEMs in developing vehicle pedestrian protection capabilities. Currently, most of the drawing of pedestrian protection test areas and the search for impact points are done manually by pedestrian protection test engineers. Due to manual drawing, the drawing stability is poor, the drawing efficiency is low, and the labor intensity is high.

[0003] For example, Chinese patent CN203101059U discloses a line drawing instrument for automobile pedestrian protection test, including a base with wheels; a dial vertically fixed on the base; a line drawing rod hinged to the dial; and a marking piece located on the line drawing rod for drawing lines. This patent has the following shortcomings: 1) It realizes movement in all directions through wheels, and the movement direction is not easy to control in this way, resulting in poor line drawing accuracy; 2) Although it preliminarily solves the line drawing problem, it is unable to find the impact point; 3) Although the line drawing instrument reduces the labor intensity to a certain extent, all work needs to be done manually. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic line drawing and point finding method for pedestrian protection test, so as to realize the drawing of part of the baseline of the pedestrian protection test area and the search and drawing of the impact point.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An automatic line drawing and point finding method for pedestrian protection test is implemented based on an automatic line drawing and point finding device, the automatic line drawing and point finding device comprises a line drawing and point finding slider with three degrees of freedom in front and back, up and down, and left and right directions, and the line drawing and point finding slider is also provided with a front edge line drawing straight edge for front edge line drawing and point finding, a left side side reference line drawing straight edge for left side side reference line drawing and point finding, a right side side reference line drawing straight edge for right side side reference line drawing and point finding, and a laser emitter and a brush;

[0007] The method comprises the following steps:

[0008] (1) Draw the leading edge line:

[0009] (1-1) Control the line drawing point finding slider to move up and down until the end of the leading edge line drawing straight edge used for leading edge line drawing point finding reaches a set height from the ground;

[0010] (1-2) Control the line drawing point finding slider to move forward and backward until the straight edge of the front edge line drawing contacts the front structure of the vehicle, and mark the contact point between the straight edge of the front edge line drawing and the front structure of the vehicle;

[0011] (1-3) Control the line drawing point finding slider to move in the left and right directions to set the spacing, and at the same time move the line drawing point finding slider forward and backward so that the straight edge of the leading edge line contacts other positions of the front structure of the vehicle, and mark all contact points;

[0012] (1-4) Connect all contact points of the straight edge drawn on the leading edge line and the front structure of the vehicle into a line to form a leading edge line;

[0013] (2) Draw the left side edge reference line:

[0014] (2-1) Control the line-finding point slider to move up and down and left and right until the straight edge of the left side reference line draws contact with the front structure of the vehicle, and mark the contact point between the straight edge of the left side reference line draws and the front structure of the vehicle;

[0015] (2-2) Control the line-finding slider to move in the front-to-back direction to set the spacing. At the same time, move the line-finding slider left and right until the straight edge of the left side baseline is in contact with other areas of the vehicle's front structure, and mark all contact points;

[0016] (2-3) Control the brush to connect all the marked contact points into a line in sequence, that is, to form the left side edge reference line;

[0017] (3) Draw the right side edge reference line:

[0018] (3-1) Control the line-finding point slider to move in the up-down and front-back directions until the straight edge of the right side reference line draws contact with the front structure of the vehicle, and mark the contact point between the straight edge of the right side reference line draws and the front structure of the vehicle;

[0019] (3-2) Control the line-finding slider to move in the front-to-back direction to set the spacing. At the same time, move the line-finding slider left and right until the straight edge of the right side baseline is in contact with other areas of the vehicle's front structure, and mark all contact points;

[0020] (3-3) Control the brush to connect all the marked contact points into a line in sequence, that is, to form the right side edge reference line;

[0021] (4) Finding and marking the impact point:

[0022] (4-1) Using a laser transmitter to find and record the impact point on the center line of the vehicle;

[0023] (4-2) Based on the impact point formation rule, the coordinates of other impact points on the front structure of the vehicle are calculated in combination with the coordinates of the impact point on the center line of the vehicle;

[0024] (4-3) Control the brush to mark all impact points.

[0025] Furthermore, in step (1-1), the height from the ground of the end of the straight edge of the leading edge line is 600 mm.

[0026] Furthermore, in step (1-3), the moving distance of the line drawing point finding slider in the left and right directions is 100 mm.

[0027] Furthermore, in step (2-2), the moving distance of the line drawing and point finding slider in the front-to-back direction is 100 mm.

[0028] Furthermore, in step (3-2), the moving distance of the line drawing point finding slider in the front-to-back direction is 100 mm.

[0029] Furthermore, the front edge line drawing straight edge, the left side reference line drawing straight edge and the right side reference line drawing straight edge are respectively installed on three sides of the line drawing and point finding slider.

[0030] Furthermore, the installation position of the front edge line drawing straight edge on the line drawing point finding slider satisfies: its main part is tilted upward along the front-back direction. Furthermore, the main part of the front edge line drawing straight edge is tilted upward at an angle of 40°.

[0031] Further, the installation position of the left side reference line drawing straight edge on the line drawing point finding slider satisfies: its main part is tilted downward in the left and right directions. Further, the main part of the left side reference line drawing straight edge is tilted downward at an angle of 45°.

[0032] Further, the installation position of the right side reference line drawing straight edge on the line drawing point finding slider satisfies: its main part is tilted downward in the left and right directions. Further, the main part of the right side reference line drawing straight edge is tilted downward at an angle of 45°.

[0033] Furthermore, the entire device automatically operates under the action of the controller and performs the following operations:

[0034] First, the controller determines whether to draw a line according to the received instruction. If so, the front edge line, the left side edge reference line and the right side edge reference line are drawn in sequence according to the above process. If not (i.e., no line is drawn), it is then determined whether to perform a point search operation. If so, the point search operation is performed according to the point search process in the above process. If not (i.e., no point search is performed), the process is directly terminated. At the same time, after the front line drawing process is completed, it is also determined whether to perform a point search operation, and the execution logic is as above.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] (1) It is easy to automate the search and marking of some reference lines and impact points;

[0037] (2) Compared with manual drawing, it has better stability and higher efficiency;

[0038] (3) Liberate labor to a certain extent and greatly reduce labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of the device used in the present invention;

[0040] Figure 2 A schematic diagram of a slider for drawing lines in the device used;

[0041] Figure 3 is a flow chart of the method of the present invention;

[0042] Description of the markings in the figure:

[0043] 1-frame for finding points by drawing lines, 2-beam moving forward and backward, 3-beam moving up and down, 4-reference line for drawing straight edges on the left side, 5-front edge line for drawing straight edges, 6-reference line for drawing straight edges on the right side, 7-mounting slot, 8-laser transmitter, 9-paintbrush, 10-slider for finding points by drawing lines, 11-controller. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0045] In the following embodiments, unless otherwise specified, functional components or technologies are conventional components or conventional technologies used in the art to implement corresponding functions.

[0046] Embodiment 1:

[0047] In order to cooperate with the controller 11 and other devices to realize the drawing of the baseline of the pedestrian protection test area and the search and drawing of the impact point, this embodiment provides an automatic line drawing and point finding method for pedestrian protection test, which is implemented based on the corresponding line drawing and point finding device. The structure of the device can be seen in Figure 1 and Figure 2 As shown, including:

[0048] Draw lines to find the frame 1;

[0049] A line-drawing point-finding slider 10 is arranged on the line-drawing point-finding frame 1 and has three degrees of freedom in the front-back, up-down, and left-right directions;

[0050] A front edge line drawing straight edge 5, a left side edge reference line drawing straight edge 4 and a right side edge reference line drawing straight edge 6 which are detachably mounted on the line drawing point finding slider 10 and are used to assist in finding the contact point of the front edge line, the left side edge reference line and the right side edge reference line respectively;

[0051] Also provided are a laser transmitter 8 arranged on the line-drawing point-finding slider 10 and used for locating the impact point, and a brush 9 used for marking the impact point, the contact point and drawing the line.

[0052] Please see again Figure 1 As shown, the line drawing point finding frame 1 is equipped with an up-and-down movable beam 3 that can move in the up-and-down direction, and a forward-and-backward movable beam 2 that can move in the forward-and-backward direction is arranged on the up-and-down movable beam 3, and the line drawing point finding slider 10 is arranged on the forward-and-backward movable beam 2 to slide in the left-and-right direction.

[0053] Two vertically movable beams 3 are arranged in parallel on the line drawing and point finding frame 1 , and the two ends of the front-rear movable beam 2 are slidably mounted on the two vertically movable beams 3 .

[0054] The three sides of the line drawing point finding slider 10 are respectively processed with mounting grooves 7 along the vertical direction, and the end positions of the front edge line drawing straight edge 5, the left side reference line drawing straight edge 4 and the right side reference line drawing straight edge 6 are respectively provided with mounting sliders that can be matched and inserted into the corresponding direction mounting grooves 7. When performing line drawing operations, the front edge line drawing straight edge 5, the left side reference line drawing straight edge 4 and the right side reference line drawing straight edge 6 are installed in the mounting groove 7, and the line drawing operation is realized by moving the line drawing point finding slider 10. At the same time, when it is necessary to perform point finding operations, the front edge line drawing straight edge 5, the left side reference line drawing straight edge 4 and the right side reference line drawing straight edge 6 can be taken out to avoid affecting the work of the brush 9.

[0055] The main part of the straight edge 5 drawn by the leading edge line is tilted upward, specifically, the main part is tilted upward at an angle of 40°. The main part of the straight edge 4 drawn by the left side reference line is tilted downward, specifically, the main part of the straight edge 6 drawn by the right side reference line is tilted downward, specifically, the main part is tilted downward at an angle of 45°. The main part here refers to the part that contacts the front structure of the vehicle when finding points. At the same time, the length requirement for the straight edge 5 drawn by the leading edge line is 1000mm, and the length requirement for the straight edge 4 drawn by the left side reference line and the straight edge 6 drawn by the right side reference line is 700mm. These two dimensions are common knowledge in the field.

[0056] The main part of the straight edge 6 drawn by the right side reference line is inclined downward at an angle of 45°.

[0057] The line drawing and point finding frame 1 is also provided with a controller 11. In order to realize the automation of the device, the controller 11 needs to have state display and storage functions, and the stability of the controller 11 should be good and the anti-interference ability should be good.

[0058] The method for drawing lines and finding points by the device of this embodiment is specifically as follows:

[0059] 1) Draw the leading edge line

[0060] a) Control the two vertically movable beams 3 to move until the height from the ground of the end of the straight edge 5 drawn by the front edge line reaches 600 mm;

[0061] b) Control the front and rear movement of the cross beam 2 until the straight edge 5 drawn on the front edge line contacts the front structure of the vehicle, determine the contact position of the straight edge 5 drawn on the front edge line and the front structure of the vehicle, and use the brush 9 to mark the contact point on the vehicle based on the information of the contact position. The movement of the brush 9 is driven by the movement of the line drawing point finding slider 10. The position of the brush 9 is generally located below the straight edge 5 drawn on the front edge line.

[0062] c) Control the line-drawing point-finding slider 10 to move left and right at intervals of 100 mm (at the same time, assist in the movement in the forward and backward directions), find the contact points between the leading edge line drawing straight edge 5 and the front structure of the vehicle, and mark all the contact points with the brush 9.

[0063] d) Control the brush 9 to connect all the marked contact points into a line, thereby forming a leading edge line.

[0064] 2) Draw the left side edge reference line

[0065] a) Coordinately control the two vertically movable beams 3 and the frontally movable beam 2 until the left side reference line drawn straight edge 4 contacts the vehicle front structure, determine the contact position between the left side reference line drawn straight edge 4 and the vehicle front structure, and mark the contact point on the vehicle with a brush 9 based on the contact position information.

[0066] b) Control the line-drawing point-finding slider 10 to move forward and backward (and also move left and right) at intervals of 100 mm, find the contact points between the left side reference line, draw the straight edge 4 and the front structure of the vehicle, and mark all the contact points with the brush 9.

[0067] c) Control the paintbrush 9 to connect all the marked contact points into a line, thereby forming a left side edge reference line.

[0068] 3) Draw the right side edge reference line

[0069] a) Coordinately control the vertical movement of the cross beam 3 and the front and rear movement of the cross beam 2 until the straight edge 6 drawn by the right side reference line contacts the front structure of the vehicle, determine the contact position of the straight edge 6 drawn by the right side reference line and the front structure of the vehicle, and mark the contact point on the vehicle with a brush 9 based on the information of the contact position.

[0070] b) Control the line-drawing point-finding slider 10 to move forward and backward (and also move left and right) at intervals of 100 mm, find the right side reference line to draw the contact points between the straight edge 6 and the front structure of the vehicle, and mark all the contact points with the brush 9.

[0071] c) Control the paintbrush 9 to connect all the marked contact points into a line, thereby forming a right side edge reference line.

[0072] 4) Find and mark the impact point

[0073] a) Use the laser transmitter 8 to find and record the impact point on the center line of the vehicle. Specifically, based on the new car evaluation standards (such as China's C-NCAP and Europe's Euro NCAP, etc.), find the corresponding impact point on the center line, then move 100mm horizontally, and then move longitudinally to find the point where it falls on the front structure of the vehicle and mark it.

[0074] b) Referring to the impact point formation rule, the controller 11 calculates the coordinates of other impact points in combination with the coordinates of the impact points on the center line.

[0075] c) Control brush 9 to mark all impact points.

[0076] The whole device automatically runs under the action of the controller 11 and performs the following operations: Figure 3 As shown:

[0077] First, the controller 11 determines whether to draw a line according to the received instruction. If so, the front edge line, the left side edge reference line and the right side edge reference line are drawn in sequence according to the above process. If not (i.e., no line is drawn), it is then determined whether to perform a point search operation. If so, the point search operation is performed according to the point search process in the above process. If not (i.e., no point search is performed), the process is directly terminated. At the same time, after the front line drawing process is completed, it is also determined whether to perform a point search operation, and the execution logic is as above.

[0078] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An automatic line drawing and point finding method for pedestrian protection test, characterized in that: Based on the automatic line drawing and point finding device, the automatic line drawing and point finding device includes a line drawing and point finding slider with three degrees of freedom in the front and back, up and down, and left and right directions. The line drawing and point finding slider is also provided with a front edge line drawing straight edge for front edge line drawing and point finding, a left side side reference line drawing straight edge for left side edge reference line drawing and point finding, a right side side reference line drawing straight edge for right side edge reference line drawing and point finding, as well as a laser transmitter and a brush; The method comprises the following steps: (1) Draw the leading edge line: (1-1) Control the line drawing point finding slider to move up and down until the end of the leading edge line drawing straight edge used for leading edge line drawing point finding reaches a set height from the ground; (1-2) Control the line drawing point finding slider to move forward and backward until the straight edge of the front edge line drawing contacts the front structure of the vehicle, and mark the contact point between the straight edge of the front edge line drawing and the front structure of the vehicle; (1-3) Control the line drawing point finding slider to move in the left and right directions to set the spacing, and at the same time move the line drawing point finding slider forward and backward so that the straight edge of the leading edge line contacts other positions of the front structure of the vehicle, and mark all contact points; (1-4) Connect all contact points of the straight edge drawn on the leading edge line and the front structure of the vehicle into a line to form a leading edge line; (2) Draw the left side edge reference line: (2-1) Control the line-finding point slider to move up and down and left and right until the straight edge of the left side reference line draws contact with the front structure of the vehicle, and mark the contact point between the straight edge of the left side reference line draws and the front structure of the vehicle; (2-2) Control the line-finding slider to move in the front-to-back direction to set the spacing. At the same time, move the line-finding slider left and right until the straight edge of the left side baseline is in contact with other areas of the vehicle's front structure, and mark all contact points; (2-3) Control the brush to connect all the marked contact points into a line in sequence, that is, to form the left side edge reference line; (3) Draw the right side edge reference line: (3-1) Control the line-finding point slider to move in the up-down and left-right directions until the straight edge of the right side reference line draws in contact with the front structure of the vehicle, and mark the contact point between the straight edge of the right side reference line draws and the front structure of the vehicle; (3-2) Control the line-finding slider to move in the front-to-back direction to set the spacing. At the same time, move the line-finding slider left and right until the straight edge of the right side baseline is in contact with other areas of the vehicle's front structure, and mark all contact points; (3-3) Control the brush to connect all the marked contact points into a line in sequence, that is, to form the right side edge reference line; (4) Finding and marking the impact point: (4-1) Using a laser transmitter to find and record the impact point on the center line of the vehicle; (4-2) Based on the impact point formation rule, the coordinates of other impact points on the front structure of the vehicle are calculated in combination with the coordinates of the impact point on the center line of the vehicle; (4-3) Control the brush to mark all impact points.

2. The automatic line drawing and point finding method for pedestrian protection test according to claim 1, characterized in that: In step (1-1), the height from the ground of the end of the straight edge of the leading edge line is 600 mm.

3. The automatic line drawing and point finding method for pedestrian protection test according to claim 1, characterized in that: In step (1-3), the moving distance of the line drawing point finding slider in the left and right directions is 100 mm; In step (2-2), the moving distance of the line drawing and point finding slider in the front-to-back direction is 100 mm; In step (3-2), the moving distance of the line drawing point finding slider in the front-to-back direction is 100 mm.

4. The automatic line drawing and point finding method for pedestrian protection test according to claim 1, characterized in that: The front edge line drawing straight edge, the left side reference line drawing straight edge and the right side reference line drawing straight edge are respectively installed on three sides of the line drawing point finding sliding block.

5. The automatic line drawing and point finding method for pedestrian protection test according to claim 1 or 4, characterized in that: The installation position of the leading edge line drawing straight edge on the line drawing point finding slider satisfies: its main body is arranged to be tilted upward along the front-back direction.

6. The automatic line drawing and point finding method for pedestrian protection test according to claim 5, characterized in that: The main part of the straight edge drawn by the leading edge line is inclined upward at an angle of 40°.

7. The automatic line drawing and point finding method for pedestrian protection test according to claim 1 or 4, characterized in that: The installation position of the left side reference line drawing straight edge on the line drawing point finding slider satisfies: its main part is tilted downward in the left and right directions.

8. The automatic line drawing and point finding method for pedestrian protection test according to claim 7, characterized in that: The main part of the straight edge drawn by the left side reference line is inclined downward at an angle of 45°.

9. The automatic line drawing and point finding method for pedestrian protection test according to claim 1 or 4, characterized in that: The installation position of the right side reference line drawing straight edge on the line drawing point finding slider satisfies: its main body is tilted downward in the left and right directions.

10. The automatic line drawing and point finding method for pedestrian protection test according to claim 9, characterized in that: The main part of the straight edge drawn by the right side reference line is inclined downward at an angle of 45°.

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