A method for controlling the internal layout of a cabin in favor of pedestrian protection

Abstract

The present application relates to a kind of cabin interior arrangement control method for the protection of pedestrian, comprising obtaining fine CAS structure of styling surface;Pedestrian protection test area is obtained;Target decomposition, make the score plan of row protection, determine the lower limit value of score according to development target, then according to the decomposition score of different vehicle, the score is decomposed into head type score and leg type score, and score chromatogram is drafted;Output limiting surface, according to the distribution state of score chromatogram, while cooperating with the mapping relationship between cabin interior space and score, the upper limit of the limiting surface of head type and leg type area is obtained, and the upper limit limiting surface is output;Cabin interior arrangement is completed using limiting surface.The present application is a kind of cabin interior arrangement control method for the protection of pedestrian, for guiding cabin interior arrangement;Vehicle cabin interior arrangement can be completed by using this method and meet the requirements of pedestrian protection, compared with traditional cabin interior arrangement mode, this method does not need to repeat and, greatly shorten the development cycle of pedestrian protection performance, improve the development efficiency of pedestrian protection.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically relating to a method for controlling the interior layout of the engine compartment that is beneficial to pedestrian protection. Background Technology

[0002] Domestic regulations related to pedestrian protection all include two indicators: head-type performance and leg-type performance. Regarding leg-type performance, leg-type impactor models are constantly being upgraded, with increasing complexity. Simultaneously, the requirements for cabin layout are becoming more stringent, necessitating coordinated development of cabin layout and pedestrian protection, requiring continuous adjustments until the cabin layout meets the needs of pedestrian protection development.

[0003] Meanwhile, during project development, extensive simulations are typically required to meet pedestrian protection regulations. Through numerous calculations, the quantitative impact of factors such as shape, space, and structural stiffness on pedestrian protection performance is derived. The mapping relationship between these influencing factors and pedestrian protection scores is then summarized and encapsulated. This encapsulated mapping relationship guides the internal layout of the cabin, thereby improving layout accuracy and shortening the project development cycle.

[0004] Currently, traditional development methods suffer from problems such as unclear boundary control and long layout locking cycles. Traditional engine compartment layout methods typically involve first borrowing space from engine compartment components of other vehicle models, then adjusting and replacing the layout according to vehicle performance requirements. Since pedestrian protection performance is greatly affected by the engine compartment layout, the layout method must be continuously matched with pedestrian protection performance before finally locking in the engine compartment layout while meeting pedestrian protection development requirements. This entire process is lengthy, easily causing project delays and impacting product development and market launch.

[0005] Therefore, there is an urgent need to develop a cabin interior layout control method that is beneficial to pedestrian protection. This method can be used to complete the layout of any component in the cabin while meeting the requirements of pedestrian protection. At the same time, it eliminates the need for repeated assembly and disassembly, and only requires layout under the constraints of the restricted surfaces. This layout control method can improve cabin layout efficiency, enhance pedestrian protection performance, and shorten the project development cycle. Summary of the Invention

[0006] The purpose of this invention is to provide a cabin interior layout control method that is beneficial to pedestrian protection, so as to solve the problems of long cabin interior layout time, failure to meet pedestrian protection performance requirements, and long project cycle.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A method for controlling the interior layout of an aircraft cabin that is beneficial to pedestrian protection includes the following steps:

[0009] A. Obtain the detailed CAS structure of the shaped surface;

[0010] B. Obtain the pedestrian protection test area, including the head area and the leg area;

[0011] C. Target decomposition and development of a performance guarantee scoring plan.

[0012] The lower limit of the score is determined based on the development goals, and then the score is decomposed according to different vehicle models. The score is decomposed into head shape score and leg shape score, and a score color chart is drawn up.

[0013] D. Output limiting surface

[0014] Based on the distribution of the score chromatogram and the mapping relationship between the cabin interior space and the score, the upper limit of the constraint surface of the head and leg regions is obtained, and the upper limit constraint surface is output.

[0015] E. Utilize the limiting surfaces to complete the cabin layout.

[0016] Furthermore, in step A, the obtained CAS structure includes, but is not limited to, components such as the front bumper assembly, fender assembly, hood, and windshield glass. In other words, the CAS can reflect all the features of the design.

[0017] Furthermore, the obtained CAS surface is converted into a finite element file with a finite element size of 1mm, and the shape features must be reflected.

[0018] Further, in step B, the head shape area and leg shape area specifically refer to: a child head shape test area for pedestrian protection, an adult head shape test area, and a leg shape test area.

[0019] Further, in step B, the pedestrian protection test area is obtained, specifically by marking the lines using CAS surface finite element files according to the development target regulations.

[0020] Further, in step C, the factors influencing the score decomposition include vehicle model influence, equipment influence, and styling influence.

[0021] Further, step D includes obtaining the head shape constraint surface, developing a score based on the head shape target, subdividing the points to obtain the scores of each single point in the hair cover area and the glass area, calculating the space required for this head shape score, taking the lower limit value of the space, taking the intersection of the lower limit values ​​of the space of each point to generate a constraint surface and smoothing it to obtain the head shape constraint surface.

[0022] Further, step D includes obtaining the leg shape constraint surface, developing a score based on the leg shape target, subdividing the points to obtain the scores of each point in the front guard area, calculating the space required for this leg shape score, taking the lower limit value of the space, taking the intersection of the lower limit values ​​of the space of each point to generate a constraint surface and smoothing it, thus obtaining the leg shape and constraint surface.

[0023] Further, step E specifically involves: based on the upper limit limit surface height obtained in step D, and in conjunction with the performance requirements of other disciplines, completing the cabin interior layout within the limit surface frame.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention provides an input boundary that is beneficial to pedestrian protection for engine compartment layout, and proposes a forward development method for pedestrian protection to guide the layout within the engine compartment. By applying this layout method, the internal layout of the vehicle engine compartment can be completed while meeting pedestrian protection requirements. Compared with traditional engine compartment layout methods, this method does not require repeated adjustments, which greatly shortens the development cycle of pedestrian protection performance and improves the efficiency and accuracy of pedestrian protection development. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 Layout flowchart;

[0028] Figures 2a-2b CAS side of a certain car model;

[0029] Figure 3 Head shape score distribution chart;

[0030] Figure 4 Leg shape score distribution chart;

[0031] Figure 5 Arrange the limiting surface. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments:

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-5 As shown, the present invention provides a cabin interior layout control method that is beneficial for pedestrian protection, comprising the following steps:

[0036] 1. Obtain detailed CAS (Design for Interior) structures for the styling surfaces. This includes, but is not limited to, components such as the front bumper assembly, fender assembly, grille, and windshield. CAS can reflect all the features of the styling.

[0037] 2. Obtain pedestrian protection testing areas. This includes testing areas for children's head shapes, adults' head shapes, and leg shapes.

[0038] 3. Decompose the objectives and formulate a performance evaluation scoring plan. Determine the lower limit of the score based on the development objectives, and then decompose the score according to different vehicle models. The score is decomposed into head type score and leg type score, and a score color chart is drawn up.

[0039] 4. Output Limitation Surfaces. Based on the distribution of the score chromatogram and the mapping relationship between the cabin interior space and the scores, the upper limit of the limitation surfaces for the head and leg regions is obtained, and the upper limit limitation surfaces are output.

[0040] 5. Utilize the limiting surfaces to complete the cabin layout. Based on the upper limit limit surface height and in conjunction with the performance requirements of other disciplines, complete the cabin interior layout within the limiting surface frame.

[0041] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention. This example uses a certain car model as an example. Figure 1 As shown, a cabin interior layout control method that is beneficial to pedestrian protection includes the following steps:

[0042] Step 1: Project Definition Concept Design:

[0043] Understand the project development definition, determine the development goals for the concept phase, such as regulatory development goals for C-NCAP, C-IASI, Euro-NCAP, etc., and formulate a scoring strategy based on the product type. In this case, the development goal for the vehicle model is a C-NCAP 5-star rating.

[0044] The second step is to obtain the detailed CAS structure of the shaped surface:

[0045] (1) The CAS obtained is proposed by the design department and must include all structures related to pedestrian protection, including but not limited to the front bumper, grille, combination lights, fenders, hood, glass, and the front of the body-in-white, and the styling details of each assembly must be reflected.

[0046] (2) Convert the obtained CAS surface into a finite element file with a finite element size of 1mm, and the shape features must be reflected.

[0047] The third step is to obtain the pedestrian protection test area:

[0048] According to the development target regulations, the lines were drawn using CAS surface finite element files, including the head-shaped and leg-shaped regions.

[0049] The fourth step is to develop a scoring plan and break down the scores according to the target vehicle model:

[0050] The scores for head shape and leg shape need to be broken down according to the development goals. Factors influencing this breakdown typically include: vehicle type (e.g., different models like sedans, SUVs, and MPVs score differently for each part); equipment (e.g., whether active pedestrian protection equipment is used); and styling (e.g., whether there are distinctive structural features, such as rising signs or characteristic lights). Taking a specific sedan model as an example, based on the above factors and the C-NCAP 5-star development goal, the head shape development goal received 5.75 points, and the leg shape development goal received 4 points.

[0051] Step 5: Define and output the limit surfaces:

[0052] (1) Obtain the head shape restriction surface

[0053] Based on a head shape target score of 5.75, point subdivisions were performed. For the headgear area, typically, the center of the headgear scores 1 point, while the outermost edges, such as the fenders, score 0 or 0.25 points, with the remaining areas transitioning from 1 to 0 points. For the glass area, the area near the interior trim typically scores 0 or 0.25 points, with the score increasing as it moves away from the interior trim. The final score for each individual point was obtained. Based on a CSV file showing the relationship between head shape space and score from previous simulations, the space required for this head shape score was calculated, and a lower limit value was taken. The intersection of these lower limit values ​​was used to generate a constraint surface, which was then smoothed to obtain the head shape constraint surface.

[0054] (2) Obtain the leg shape constraint surface

[0055] Based on the leg shape target score of 4, the points are subdivided. For the front bumper area, the main loss of points is usually the MCL (Mandibular Collateral Ligament) elongation value of the knee, while the thigh bending moment and calf bending moment have smaller losses. Therefore, the main control for the leg shape is the X-direction distance of the front bumper from the front frame, bumper crossbeam and sub-crossbeam, etc. Finally, the scores of each point are obtained. According to the CSV file of the relationship between leg shape space and score obtained from previous simulation results, the space required for this leg shape score is calculated, and the lower limit value of the space is taken. The intersection of the lower limit values ​​of the space of each point is used to generate a constraint surface and smooth it to obtain the leg shape and constraint surface.

[0056] Step 6: Complete the cabin layout using the limiting surfaces:

[0057] Output head and leg limiting surface

[0058] The fourth step yields the head and leg restriction surfaces of the cabin interior space, determines the assemblies that need to be arranged in the cabin, and preliminarily plans the assembly positions based on performance requirements. The cabin layout is carried out within the restriction surface range requirements. This arrangement of the cabin space can meet the performance requirements of pedestrian protection without repeated adjustments.

[0059] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method of controlling the internal arrangement of a cabin in favor of pedestrian protection, characterized in that, The method comprises the following steps: A. Obtain a fine CAS structure of a styling surface; the obtained CAS structure comprises a front bumper assembly, a fender assembly, a hood, and a windscreen component CAS; the obtained CAS surface is converted into a finite element file with a finite element size of 1 mm; B. Obtain a pedestrian protection test area, which comprises a head shape area and a leg shape area; the head shape area and the leg shape area specifically comprise a child head shape test area, an adult head shape test area, and a leg shape test area; the pedestrian protection test area is obtained by marking lines according to a development target regulation and using the CAS surface finite element file; C. Target decomposition, and develop a pedestrian protection score plan According to the development target, a lower limit value of the score is determined, and the score is decomposed according to different vehicle models to obtain a head shape score and a leg shape score, and a score chromatogram is prepared; factors affecting the score decomposition include vehicle model influence, equipment influence, and styling influence; D. Output a limiting surface According to the score chromatogram distribution state, and in combination with the mapping relationship between the machine cabin internal space and the score, an upper limit of the head shape and leg shape area limiting surface is obtained, and the upper limit limiting surface is output; The head shape limiting surface is obtained, the head shape target development score is obtained, point subdivision is performed, each single point score of the hood area and the glass area is obtained, the space required for the head shape score is calculated, the lower limit value of the space is obtained, the intersection of the lower limit values of the points is obtained to generate a limiting surface and is smoothed to obtain the head shape limiting surface; The leg shape limiting surface is obtained, the leg shape target development score is obtained, point subdivision is performed, each point score of the front bumper area is obtained, the space required for the leg shape score is calculated, the lower limit value of the space is obtained, the intersection of the lower limit values of the points is obtained to generate a limiting surface and is smoothed to obtain the leg shape limiting surface; E. Complete the machine cabin internal arrangement using the limiting surface; specifically, according to the upper limit limiting surface height obtained in step D, the machine cabin internal arrangement is completed within the limiting surface frame.

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