Calculation and optimization method for trunk lid elbow hinge axis arrangement

Abstract

The present invention relates to the technical field of automobile structural design optimization methods, and specifically refers to a trunk lid bent tube hinge axis arrangement calculation optimization method. According to the rear modeling CAS surface, as well as known design parameters and set constraints, the trunk lid initial opening θ0 and the hinge axis initial coordinate f0 are set; a hinge optimization area is constructed, and within the hinge optimization area, the trunk lid initial opening θ0 and the hinge axis initial coordinate f0 are calculated based on the hinge span design requirements, human-machine goals, the safety gap of the hinge relative to the sealing strip movement, the safety gap requirements of the trunk lid and the rear windshield during the opening process, the assembly space distance between the hinge axis and the rear windshield, and the trunk lid closing force requirements to obtain the optimal solution for the hinge axis. The optimization method of the present invention is reasonably designed, with rich considerations, avoiding the risk of repeated modifications in the later stage, improving the efficiency of the hinge axis design and development, and has great promotion value.

Description

Technical Field

[0001] The invention relates to the technical field of automobile structural design optimization methods, and in particular to a calculation optimization method for the arrangement of a trunk lid elbow hinge axis. Background Art

[0002] The bent tube hinge is the most commonly used basic retaining part in the opening and closing mechanism system of the car trunk lid. The layout of its hinge axis is the basis for the layout and motion analysis of the entire trunk lid system. The feasibility of the layout method, that is, the efficiency and accuracy of solving the position of the bent tube hinge axis, directly affects the layout and development efficiency of the entire trunk lid system, and even has a great impact on the volume, rear shape and split seam of the entire trunk.

[0003] At present, the layout of the trunk lid elbow hinge axis is mainly carried out through geometric drawing methods, but this method is cumbersome, the layout efficiency is low, and often fails to obtain a reasonable hinge axis. To solve this problem, engineers can now exhaustively enumerate and try to find a hinge axis that meets the requirements. However, this method has the problems of low layout efficiency, unclear adjustment direction and target, and once the CAS (Concept A Surface, i.e. the initial styling surface of the car) is adjusted, the whole process needs to be started again, which seriously affects the development progress of the project and also consumes a lot of manpower and material resources. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a method for calculating and optimizing the arrangement of the bent tube hinge axis of a trunk lid.

[0005] The technical solution of the present invention is:

[0006] A calculation and optimization method for the layout of the trunk lid elbow hinge axis.

[0007] According to the rear styling CAS surface, known design parameters and set constraints, the initial opening of the trunk lid θ0 and the initial coordinate of the hinge axis f0 are set;

[0008] According to the hinge span design requirements in the design parameters, the initial hinge coordinate f0 is optimized to obtain the span optimization coordinate f1;

[0009] Constructing a hinge layout plane according to the span optimization coordinate f1, and setting a hinge optimization area within the hinge layout plane;

[0010] In the hinge optimization area, optimize the initial opening θ0 of the trunk lid and the span optimization coordinate f1 according to the following steps:

[0011] S1, based on the human-machine target in the set constraint conditions, optimize the initial opening θ0 and the span optimization coordinate f1 of the luggage box to obtain the human-machine optimized opening θ2 and the human-machine optimized coordinate f2;

[0012] S2, based on the setting requirement of the safety clearance of the hinge relative to the sealing strip in the set constraint condition, the human-machine optimization coordinate f2 is optimized to obtain the motion safety optimization coordinate f3;

[0013] S3, based on the safety clearance requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the ergonomic optimization opening θ2 and the motion safety optimization coordinate f3 are optimized to obtain the clearance safety optimization opening θ3 and the clearance safety optimization coordinate f4;

[0014] S4, based on the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint condition, the gap safety optimization opening θ3 and the gap safety optimization coordinate f4 are optimized to obtain the assembly optimization opening θ4 and the assembly optimization coordinate f5;

[0015] S5, optimizing the assembly optimization coordinate f5 based on the trunk lid closing force requirement in the design parameters to obtain the closing force optimization coordinate f6;

[0016] S6. Verify the assembly optimized opening Θ4 and closing force optimized coordinate f6. If they meet the design requirements, output the assembly optimized opening Θ4 and closing force optimized coordinate f6 as the optimal solution for the hinge axis. Otherwise, adjust the rear styling CAS surface.

[0017] According to a method for calculating and optimizing the axis layout of a trunk lid bent tube hinge provided by the present invention, the method for constructing a layout plane of the hinge based on the span optimization coordinate f1 comprises: constructing an XZ plane including the span optimization coordinate f1 as the layout plane of the hinge based on the Y value in the span optimization coordinate f1.

[0018] According to a method for calculating and optimizing the arrangement of a trunk lid bent tube hinge axis provided by the present invention, the method for setting a hinge optimization area within the hinge arrangement plane comprises: within the hinge arrangement plane, taking a line connecting a rear windshield starting point and a rear windshield end point of an intersection line of the rear windshield and the hinge arrangement plane as an upper boundary line, offsetting the upper boundary line downward in the Z direction to construct a lower boundary line, and an area between the upper boundary line and the lower boundary line within the hinge arrangement plane as the hinge optimization area.

[0019] According to a method for calculating and optimizing the arrangement of a trunk lid bent tube hinge axis provided by the present invention, the method for optimizing the hinge initial coordinate f0 according to the hinge span design requirements in the design parameters includes: determining the initial span corresponding to the coordinate according to the y0 value in the hinge initial coordinate f0 (x0, y0, z0), comparing the ratio of the initial span to the trunk lid width in the design parameters with the hinge span design requirements, if the ratio is within the range of the hinge span design requirements, the span design requirements are met, otherwise, the absolute value of the y0 coordinate needs to be increased until the hinge span design requirements are met, and the span optimization coordinate f1 (x0, y1, z0) is obtained.

[0020] According to a method for calculating and optimizing the arrangement of a trunk lid bent tube hinge axis, in step S1, the man-machine height is calculated based on the coordinates of the initial point of the end when the trunk lid is closed, the Z-direction height from the ground line of the vehicle to the tire centerline, the height difference when the trunk lid is fully opened, the optimized span coordinates f1 (x0, y1, z0) and the initial opening Θ0 of the trunk in the design parameters. If the calculated man-machine height is within the set range of the man-machine height requirement, the man-machine height requirement is met. Otherwise, the initial opening Θ0 of the trunk needs to be optimized until the man-machine height requirement is met, thereby obtaining the optimized man-machine height opening Θ1.

[0021] According to a method for calculating and optimizing the arrangement of a trunk lid bent tube hinge axis provided by the present invention, in the step S1, the human-machine operating distance is calculated according to the coordinates of the initial point of the end when the trunk lid is closed, the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 in the design parameters. If the calculated human-machine operating distance is within the set range of the human-machine operating distance requirement, the human-machine operation requirement is met. Otherwise, it is necessary to optimize the x0 value in the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 until the human-machine operation requirement is met, and the human-machine optimization coordinates f2 (x1, y1, z0) and the human-machine optimization opening Θ2 are obtained.

[0022] According to a method for calculating and optimizing the axis arrangement of a trunk lid bent tube hinge provided by the present invention, in the step S2, the distance between the sealing strip installation point coordinates and the ergonomic optimization coordinates f2 (x1, y1, z0) is calculated according to the sealing strip installation point coordinates and the ergonomic optimization coordinates f2 (x1, y1, z0) in the design parameters; if the calculated distance meets the safety clearance setting requirements for the movement of the hinge relative to the sealing strip in the set constraint conditions, the movement clearance requirements are met; otherwise, the x1 value and the z0 value in the ergonomic optimization coordinates f2 (x1, y1, z0) are optimized until the movement clearance requirements are met, thereby obtaining the movement safety optimization coordinates f3 (x2, y1, z1).

[0023] According to a method for calculating and optimizing the arrangement of a bent tube hinge axis of a trunk lid provided by the present invention, in the step S3, the minimum distance between the initial point of the front end of the trunk lid and the rear windshield when the trunk lid is opened is calculated based on the coordinates of the starting point of the rear windshield and the end point of the rear windshield of the intersection line of the rear windshield and the hinge arrangement plane and the motion safety optimization coordinates f3 (x2, y1, z1). If the calculated minimum distance meets the safety clearance requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the safety clearance requirement is met. Otherwise, x2 and z1 in the motion safety optimization coordinates f3 (x2, y1, z1) and the ergonomic optimization opening Θ2 are optimized to obtain the clearance safety optimization opening Θ3 and the clearance safety optimization coordinates f4 (x3, y1, z2).

[0024] According to a trunk lid bent tube hinge axis arrangement calculation optimization method provided by the present invention, in the step S4, the minimum spacing between the hinge axis and the rear windshield is calculated according to the rear windshield starting point coordinates and rear windshield end point coordinates of the intersection line of the rear windshield and the hinge arrangement plane and the clearance safety optimization coordinates f4 (x3, y1, z2). If the calculated minimum spacing is greater than the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint condition, the assembly clearance requirement is met. Otherwise, x3 and z2 in the clearance safety optimization coordinates f4 (x3, y1, z2) and the clearance safety optimization opening θ3 are optimized to obtain the assembly optimization opening θ4 and the assembly optimization coordinates f5 (x4, y1, z2). 3) .

[0025] According to a method for calculating and optimizing the arrangement of a trunk lid bent tube hinge axis provided by the present invention, in step S5, the maximum closing force of the trunk lid when fully open is calculated based on the weight of the trunk lid assembly, the coordinates of the center of gravity of the trunk lid assembly, the torsion bar diameter, the torsion bar closed angle, the coordinates of the initial point of the end when the trunk lid is closed, the assembly optimized opening θ4, and the assembly optimized coordinates f5 (x4, y1, z3) in the design parameters; if the calculated maximum closing force of the trunk lid when fully open meets the trunk lid closing force requirement in the set constraint conditions, the closing requirement is met; otherwise, x4 and z3 in the assembly optimized coordinates f5 (x4, y1, z3) are optimized to obtain the closing force optimized coordinates f6 (x5, y1, z4).

[0026] The advantages of the present invention are as follows: 1. The optimization method of the present invention establishes a set of effective and standardized hinge shaft design methods. Through parameterized optimization control, a reasonable bent tube hinge shaft can be arranged quickly and effectively, avoiding the risk of repeated modification of rear modeling and split seams, improving the layout efficiency of the hinge shaft and the development efficiency of the trunk cover system, and minimizing the occupied trunk space. At the same time, the method can also be used to quickly verify the usability of the developed hinge, and can guide the rational design of the newly developed hinge structure, thereby saving the development cost of the hinge to the maximum extent;

[0027] 2. The optimization method of the present invention fully considers the requirements of human-machine objectives. Based on the set human-machine objectives, a hinge axis arrangement structure that can meet the needs of most people is designed, which is more convenient for personnel to use and more ergonomically arranged.

[0028] 3. The optimization method of the present invention fully considers various influencing factors during the optimization process of the hinge axis, including span requirements, human-machine requirements, clearance requirements, assembly requirements and closing force requirements. The optimal solution of the hinge axis finally calculated can meet various needs to the greatest extent. The design method is reasonable and the design scheme is ingenious.

[0029] The optimization method of the present invention is reasonably designed, takes into account a variety of factors, avoids the risk of repeated modifications in the later stage, improves the efficiency of hinge shaft design and development, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 : A schematic diagram of the setting of the initial opening θ0 of the trunk lid and the initial coordinate f0 of the hinge axis of the present invention;

[0031] Figure 2 : Schematic diagram of optimizing the initial coordinate f0 of the hinge axis to obtain the span optimization coordinate f1 of the present invention;

[0032] Figure 3 : A schematic diagram of the present invention optimizing the initial opening θ0 of the trunk lid to obtain the human-machine height optimized opening θ1;

[0033] Figure 4 : The present invention optimizes the span optimization coordinate f1 and the man-machine height optimization opening θ1 to obtain the man-machine optimization coordinate f2 and the man-machine optimization opening θ2;

[0034] Figure 5 : A schematic diagram of the present invention optimizing the human-machine optimized coordinate f2 to obtain the motion safety optimized coordinate f3;

[0035] Figure 6 : The present invention optimizes the motion safety optimization coordinate f3 and the human-machine optimization opening θ2 to obtain the gap safety optimization coordinate f4 and the gap safety optimization opening θ3;

[0036] Figure 7 : The present invention optimizes the gap safety optimization coordinate f4 and the gap safety optimization opening θ3 to obtain the assembly optimization coordinate f5 and the assembly optimization opening θ4;

[0037] Figure 8 : The present invention optimizes the assembly optimization coordinate f5 to obtain a schematic diagram of the closing force optimization coordinate f6. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1 to 8 As shown, this embodiment involves a method for calculating and optimizing the layout of the bent tube hinge axis of the trunk lid. Specifically, it is used to design the layout of the bent tube hinge axis of the trunk lid during the vehicle development stage. There is a bent tube hinge on each side of the trunk lid. The bent tube hinge can rotate around the horizontal Y-direction hinge axis (in this embodiment, the X-direction refers to the vehicle length direction, the Y-direction refers to the vehicle width direction, and the Z-direction refers to the vehicle height direction). The two hinge axes overlap in the Y direction. The bent tube hinges on both sides are symmetrically distributed around the X-direction center line. The intersection of the line connecting the two bent tube hinge axes and the X-direction center line is Y equal to 0 (ie Y0). The line connecting the axes of the two hinge axes is the span of the trunk lid hinge axis. This embodiment uses the axis of the bent tube hinge on one side as the calculation point. In fact, what needs to be calculated is the coordinates of the hinge axis on one side. The hinges on the other side are symmetrically distributed. Figure 1 As shown, this embodiment is calculated as Figure 1 The coordinates of the trunk lid hinge axis (such as Figure 1 f0) and trunk lid opening (as shown in Figure 1 Θ0) shown in , after obtaining the above parameters, the layout of the trunk lid hinge axis can be determined.

[0043] In the specific calculation and optimization process, the initial values ​​need to be set first. According to the rear styling CAS surface (Concept ASurface, i.e. the preliminary styling surface of the car), the known design parameters and the set constraints, the initial opening θ0 of the trunk lid and the initial coordinate f0 of the hinge axis are set.

[0044] The known design parameters of this embodiment include: trunk lid width L0, front initial point coordinates P1 (X1, Z1) when the trunk lid is closed, end initial point coordinates P4 (X4, Z4) when the trunk lid is closed [actually the trunk lid operation position coordinates], sealing strip installation point coordinates P2 (X2, Z2), rear windshield starting point P5 (X5, Z5), rear windshield end point P6 (X6, Z6), Z-direction height h0 from the vehicle ground line to the tire center line (X=0), and luggage The height difference h1 when the trunk lid is fully opened (the rear end side of the trunk lid along the X-direction is a curved structure, and the heights of the position of the corresponding hinge along the X-direction and the position of the corresponding center line along the X-direction are different when the trunk lid is fully opened. When the trunk lid is fully opened, the height difference between the point in the XZ plane corresponding to the X-direction center line, i.e., the point in the XZ plane corresponding to Y0 and the point in the XZ plane corresponding to the hinge axis is h1), the weight of the trunk lid assembly m, the coordinates of the center of gravity of the trunk lid assembly P7 (X7, Z7), the torsion bar diameter d of the bent tube hinge, and the torsion bar closed angle θ5.

[0045] The constraints set in this embodiment include: hinge span design requirement L / L0∈[2 / 3, 1] (L refers to the length of the line connecting the hinge axes on both sides), the trunk lid opening angle is set to θ∈[80°, 100°], the setting range of the human-machine height requirement H1∈[1950mm, 2150mm], the setting range of the human-machine operation distance requirement H0∈[150mm, 200mm], the setting requirement of the safety clearance of the hinge relative to the sealing strip H2≥186mm, the safety clearance requirement of the trunk lid and the rear windshield during the opening process H3≥10mm, the assembly space distance requirement between the hinge axis and the rear windshield H4≥50mm, and the trunk lid closing force requirement F max >20N.

[0046] According to the known design parameters and the set constraints, the initial opening of the trunk lid θ0 and the initial coordinate of the hinge axis f0 can be set. In fact, a solution set that meets the design parameters and constraints is constructed based on the design parameters and constraints. The solution set that meets the requirements is subsequently optimized until the optimal solution is obtained.

[0047] Then, according to the hinge span design requirements in the design parameters, the initial hinge coordinate f0 is optimized to obtain the span optimization coordinate f1. The optimization process of this embodiment first needs to construct the hinge layout plane, which is equivalent to converting the three-dimensional design optimization process into a two-dimensional design optimization process, greatly reducing the amount of data processing, and constructing the hinge optimization area in the hinge layout plane. The hinge optimization area in the hinge layout plane only occupies a small part, and constructing the hinge optimization area can filter out most of the useless data, which is convenient for subsequent optimization processing.

[0048] Then, in the hinge optimization area, the initial opening θ0 of the trunk lid and the span optimization coordinate f1 are optimized according to the following steps:

[0049] S1, based on the human-machine target in the set constraint conditions, optimize the initial opening θ0 and the span optimization coordinate f1 of the luggage box to obtain the human-machine optimized opening θ2 and the human-machine optimized coordinate f2;

[0050] S2, based on the setting requirement of the safety clearance of the hinge relative to the sealing strip in the setting constraint condition, the human-machine optimization coordinate f2 is optimized to obtain the motion safety optimization coordinate f3;

[0051] S3, based on the safety clearance requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the ergonomic optimization opening θ2 and the motion safety optimization coordinate f3 are optimized to obtain the clearance safety optimization opening θ3 and the clearance safety optimization coordinate f4;

[0052] S4, based on the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint condition, the gap safety optimization opening θ3 and the gap safety optimization coordinate f4 are optimized to obtain the assembly optimization opening θ4 and the assembly optimization coordinate f5;

[0053] S5, optimizing the assembly optimization coordinate f5 based on the trunk lid closing force requirement in the design parameters to obtain the closing force optimization coordinate f6;

[0054] S6. Verify the assembly optimized opening Θ4 and closing force optimized coordinate f6. If they meet the design requirements, output the assembly optimized opening Θ4 and closing force optimized coordinate f6 as the optimal solution for the hinge axis. Otherwise, adjust the rear styling CAS surface.

[0055] Among them, steps S1 to S6 continuously optimize the initial opening Θ0 of the trunk lid and the span optimization coordinate f1, screen out the initially set solution set, and screen out the parameters that do not meet the requirements until the optimal solution that meets the set constraints is finally obtained. The final solution may also be a solution set, which contains multiple solutions that all meet the set constraints. The optimal solution can be found in the solution set. This step can be selected based on the experience of the designer.

[0056] The final optimal solution needs to be verified. If it meets the design requirements, the final result can be output. If it does not meet the requirements, the optimization of the trunk lid hinge axis has been completed, which proves that there is a problem with the rear styling CAS surface and the rear styling CAS surface of the vehicle needs to be adjusted.

[0057] In a further embodiment, the present embodiment optimizes the above scheme, and determines the initial span corresponding to the coordinate according to the y0 value in the initial hinge coordinate f0 (x0, y0, z0), and compares the ratio of the initial span to the trunk lid width in the design parameters with the hinge span design requirement. If the calculated ratio is within the range of the hinge span design requirement, the span design requirement is met. Otherwise, the absolute value of the y0 coordinate needs to be increased until the requirement is met, and the optimized span coordinate f1 (x0, y1, z0) is obtained, as shown in FIG. Figure 2 shown.

[0058] That is, according to the initial hinge coordinate f0 (x0, y0, z0), the initial span L corresponding to the coordinate is obtained, and L / L0 is compared with the hinge span design requirements in the set constraint conditions. If L / L0 is in [2 / 3, 1], it is judged that the current hinge initial coordinate f0 (x0, y0, z0) meets the design requirements. If L / L0 is not in [2 / 3, 1], it is necessary to adjust the y0 value in the initial hinge coordinate f0 (x0, y0, z0). The specific adjustment is to increase the absolute value of the y0 value until L / L0 is in [2 / 3, 1]. At this time, the optimized coordinate is the span optimization coordinate f1 (x0, y1, z0). If the hinge span design requirements are met, there is no need to adjust y0, and y0 is equal to y1.

[0059] This step actually optimizes the Y position of the hinge installation position through the span, screens out the parameters that do not meet the design requirements in the Y direction, and reduces the amount of data to be processed.

[0060] In an optional embodiment, the method for constructing the layout plane of the hinge according to the span optimization coordinate f1 in this embodiment includes: constructing an XZ plane containing the span optimization coordinate f1 (x0, y1, z0) (referring to the hinge axis corresponding to the span optimization coordinate) as the layout plane of the hinge based on the Y value (i.e., y1) in the hinge axis span optimization coordinate f1 (x0, y1, z0). This step is equivalent to converting three-dimensional processing data into two-dimensional processing data, which greatly reduces the amount of data processing.

[0061] In a further embodiment, the method of setting the hinge optimization area within the hinge layout plane of this embodiment includes: within the hinge layout plane, taking the line connecting the rear windshield starting point P5 and the rear windshield end point P6 of the intersection of the rear windshield and the hinge layout plane as the upper boundary line, offsetting the upper boundary line downward in the Z direction (the offset distance needs to include the movement space of the hinge) to construct a lower boundary line, and the area between the upper boundary line and the lower boundary line within the hinge layout plane is the hinge optimization area.

[0062] In a further embodiment, this embodiment optimizes step S1 on the basis of the above embodiment. Specifically, in the above step S1, the man-machine height is calculated according to the design parameters of the initial point coordinates P4 (X4, Z4) of the end when the trunk lid is closed, the Z-direction height h0 from the ground line of the vehicle to the center line of the tire, the height difference h1 when the trunk lid is fully opened, the optimized span coordinates f1 (x0, y1, z0) and the initial opening Θ0 of the trunk. If the calculated man-machine height is within the set range of the man-machine height requirement, the man-machine height requirement is met. Otherwise, the initial opening Θ0 of the trunk needs to be optimized until the man-machine height requirement is met to obtain the optimized man-machine height opening Θ1.

[0063] like Figure 3 As shown, the coordinates of the initial point P4 (X4, Z4) at the end when the trunk lid is closed, the Z-direction height h0 from the ground line of the vehicle to the tire centerline (X=0), the height difference h1 when the trunk lid is fully opened, the span optimization coordinates f1 (x0, y1, z0), and the initial opening Θ0 of the trunk are established:

[0064]

[0065] Where: H1(x0, z0, Θ0)——the man-machine height corresponding to the span optimization coordinate f1(x0, y1, z0) and the initial opening of the luggage compartment Θ0;

[0066] X4——X value of the coordinate of the end initial point when the trunk lid is closed;

[0067] Z4——Z value of the coordinate of the end initial point when the trunk lid is closed;

[0068] x0——X value of span optimization coordinate;

[0069] z0——Z value of span optimization coordinates;

[0070] h0——Z-direction height from the vehicle ground line to the tire centerline (X=0);

[0071] h1 – height difference when the trunk lid is fully opened;

[0072] Θ0——initial opening of the trunk;

[0073] θ0 - the angle between the line connecting the end initial point and the span optimization coordinate when the trunk lid is closed and the XY plane containing the span optimization coordinate, which can be calculated based on the coordinates of the end initial point P4 (X4, Z4) when the trunk lid is closed and the span optimization coordinates f1 (x0, y1, z0).

[0074] After calculating H1(x0, z0, Θ0), compare H1(x0, z0, Θ0) with the set H1, H1∈[1950mm, 2150mm]. If the calculated H1(x0, z0, Θ0) is within this range, it proves that the human-machine height requirement meets the design requirements, that is, 95% of men do not hit their heads after the trunk lid is opened.

[0075] In a further optimization embodiment, this embodiment continues to optimize step S1. In step S1, the human-machine operating distance is calculated according to the coordinates of the initial point of the end when the trunk lid is closed (X4, Z4), the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 in the design parameters. If the calculated human-machine operating distance is within the set range of the human-machine operating distance requirement, the human-machine operation requirement is met. Otherwise, it is necessary to optimize the x0 value in the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 until the human-machine operation requirement is met, and the human-machine optimization coordinates f2 (x1, y1, z0) and the human-machine optimization opening Θ2 are obtained.

[0076] like Figure 4 As shown, the human-machine operating distance requirement is that 5% of women can operate the door closing, which can be calculated as follows:

[0077]

[0078] Among them: H0(x0, z0, θ1)——the man-machine operating distance corresponding to the span optimization coordinate f1(x0, y1, z0) and the man-machine height optimization opening θ1;

[0079] X4——X value of the coordinate of the end initial point when the trunk lid is closed;

[0080] Z4——Z value of the coordinate of the end initial point when the trunk lid is closed;

[0081] x0——X value of span optimization coordinate;

[0082] z0——Z value of span optimization coordinates;

[0083] Θ1——man-machine height optimization opening;

[0084] θ0 - the angle between the line connecting the end initial point and the span optimization coordinate when the trunk lid is closed and the XY plane containing the span optimization coordinate, which can be calculated based on the coordinates of the end initial point P4 (X4, Z4) when the trunk lid is closed and the span optimization coordinates f1 (x0, y1, z0).

[0085] After calculating H0(x0, z0, Θ1), compare H0(x0, z0, Θ1) with the set range of H0, H0∈[150mm, 200mm]. If the calculated H0(x0, z0, Θ1) is within this range, it proves that the human-machine operation distance meets the design requirements, that is, 5% of women can operate to close the trunk lid after it is opened.

[0086] In another optimized embodiment, this embodiment optimizes the above-mentioned step S2. In the above-mentioned step S2, the distance between the sealing strip installation point coordinate P2 (X2, Z2) and the ergonomic optimization coordinate f2 (x1, y1, z0) is calculated according to the sealing strip installation point coordinate P2 (X2, Z2) and the ergonomic optimization coordinate f2 (x1, y1, z0) in the design parameters. If the calculated distance is within the safety clearance setting requirement for the movement of the hinge relative to the sealing strip, the movement clearance requirement is met. Otherwise, the x1 value and the z0 value in the ergonomic optimization coordinate f2 (x1, y1, z0) are optimized until the movement clearance requirement is met, and the movement safety optimization coordinate f3 (x2, y1, z1) is obtained. Figure 5 shown.

[0087] In order to meet the movement clearance requirements between the elbow hinge and the sealing strip, the distance between the sealing strip installation point coordinates P2 (X2, Z2) and the ergonomic optimization coordinates f2 (x1, y1, z0) is required to meet the safety clearance setting requirements H2 ≥ 186 mm for the hinge to move relative to the sealing strip. H2 can be calculated according to the following formula:

[0088]

[0089] Where: H2(x1, z0) – the distance between the sealing strip installation point coordinates and the ergonomic optimization coordinates f2(x1, y1, z0);

[0090] x1——X value of ergonomic optimization coordinates;

[0091] z0——Z value of ergonomic optimization coordinates;

[0092] X2——X value of the sealing strip installation point coordinates;

[0093] Z2——Z value of the sealing strip installation point coordinates.

[0094] After calculating H2(x1, z0), compare H2(x1, z0) with the set H2. If the calculated H2(x1, z0) ≥ 186mm, it proves that the safety gap of the hinge relative to the sealing strip meets the design requirements.

[0095] In another optimized embodiment, step S3 of this embodiment is optimized. Specifically, in the above step S3, the minimum distance between the initial point of the front end of the trunk lid and the rear windshield when the trunk lid is opened is calculated according to the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6) of the intersection line of the rear windshield and the hinge layout plane and the motion safety optimization coordinates f3 (x2, y1, z1). If the minimum distance meets the safety gap requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the safety gap requirement is met. Otherwise, x2 and z1 in the motion safety optimization coordinates f3 (x2, y1, z1) and the ergonomic optimization opening Θ2 are optimized to obtain the gap safety optimization opening Θ3 and the gap safety optimization coordinates f4 (x3, y1, z2).

[0096] like Figure 6 As shown, during the entire opening movement, when the trunk lid is opened to the maximum angle, the gap between the initial point of the front end of the trunk lid and the rear windshield is the smallest. The gap value H3 from this point to the rear windshield is set as a safety distance constraint. When adjusting the hinge axis, it is only necessary to check that H3 ≥ 10 mm.

[0097] The coordinates of the initial point of the front end when the trunk lid is fully opened P1' (X1', Z1') can be calculated based on the coordinates of the initial point of the front end when the trunk lid is closed P1 (X1, Z1), the motion safety optimization coordinates f3 (x2, y1, z1), and the ergonomic optimization opening θ2. The intersection of the rear windshield and the layout plane of the hinge is the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6). The length of the line connecting the coordinates of the initial point of the front end when the trunk lid is fully opened and the rear windshield starting point P5 (X5, Z5) is l3. The line connecting the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6) is l2. The angle between l2 and l3 is θ2. It can be specifically calculated according to the following formula:

[0098] H3(x2,z1,θ2)=l3*sin(θ2)

[0099] Where: H3(x2, z1, θ2) is the minimum distance between the initial point of the front end of the trunk lid and the rear windshield when the trunk lid is opened;

[0100] l3——The length of the line connecting the coordinates of the front initial point when the trunk lid is fully opened and the starting point P5 (X5, Z5) of the rear windshield;

[0101] θ2——the angle between the line connecting the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6) and the line connecting the front initial point coordinates when the trunk lid is fully opened and the rear windshield and the rear windshield starting point P5 (X5, Z5);

[0102] Θ3——Gap safety optimization opening.

[0103] Compare the calculated H3(x2, z1, Θ2) with H3 in the set constraint conditions. If H3(x2, z1, Θ2) ≥ 10 mm, it can be determined that the distance between the initial point of the front end of the trunk lid and the rear windshield meets the set requirements when the trunk lid is currently opened. Otherwise, it is necessary to optimize x2 and z1 in the motion safety optimization coordinates f3(x2, y1, z1) and the ergonomic optimization opening Θ2 to obtain the gap safety optimization opening Θ3 and the gap safety optimization coordinates f4(x3, y1, z2).

[0104] In another further embodiment, the above-mentioned step S4 of this embodiment is optimized. In the above-mentioned step S4, the starting point P5 (X5, Z5) of the rear windshield and the end point P6 (X6, Z6) of the rear windshield and the gap safety optimization coordinate f4 (x3, y1, z2) are used to calculate the minimum distance between the hinge axis and the rear windshield. If the minimum distance is greater than the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint condition, the assembly gap requirement is met. Otherwise, x3 and z2 in the gap safety optimization coordinate f4 (x3, y1, z2) and the gap safety optimization opening Θ3 are optimized to obtain the assembly optimized opening Θ4 and the assembly optimized coordinate f5 (x4, y1, z3).

[0105] This embodiment discusses whether the distance between the hinge axis and the rear windshield meets the design requirements. By setting the distance value H4 between the gap safety optimization coordinate f4 (x3, y1, z2) and the rear windshield as the installation space distance constraint, it is only necessary to check H4 ≥ 50mm when adjusting the hinge axis.

[0106] like Figure 7 As shown, the length of the line between the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6), the length of the line between the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6) is l2, the length of the line between the gap safety optimization coordinate f4 (x3, y1, z2) and the rear windshield end point P6 (X6, Z6) is l6, and the angle between the two lines is θ3, which can be specifically calculated according to the following formula:

[0107] H4(x3,z2,θ3)=l6*sin(θ3)

[0108] Where: H4 (x3, z2, θ3) - the minimum distance between the hinge axis and the rear windshield;

[0109] l6——the length of the line between the rear windshield end point P6 (X6, Z6) and the gap safety optimization coordinates;

[0110] θ3——the angle between the line connecting the rear windshield starting point P5 (X5, Z5) and the rear windshield end point P6 (X6, Z6) and the line connecting the rear windshield end point P6 (X6, Z6) and the gap safety optimization coordinate, that is, the angle between l2 and l6, which can be calculated using the above coordinate values;

[0111] Θ3——Gap safety optimization opening.

[0112] In another further embodiment, this embodiment optimizes the above-mentioned step S5. Specifically, in the above-mentioned step S5, the maximum closing force of the trunk lid when fully open is calculated according to the trunk lid weight m, the center of gravity coordinates P7 (X7, Z7) of the trunk lid assembly, the torsion bar diameter d, the torsion bar closed angle θ5, the initial point coordinates P4 (X4, Z4) of the end when the trunk lid is closed, the assembly optimization opening θ4 and the assembly optimization coordinates f5 (x4, y1, z3) in the design parameters. If the calculated maximum closing force of the trunk lid when fully open meets the trunk lid closing force requirements in the set constraints, the closing requirements are met; otherwise, x4 and z3 in the assembly optimization coordinates f5 (x4, y1, z3) are optimized to obtain the closing force optimization coordinates f6 (x5, y1, z4).

[0113] From the torque balance formula, we can know that: torsion bar torque = gravity torque + friction torque + wind torque + T.

[0114] The maximum closing force F of the trunk lid when fully open is obtained max =[torsion bar moment - (gravity moment + friction moment + wind moment)] / L>20 N. The closing force to be calculated is greater than the maximum closing force of 20 N in the set constraint condition. L is the operating lever arm, which can be calculated by assembling the optimized coordinates f5 (x4, y1, z3) and the coordinates of the initial point of the end when the trunk lid is closed P4 (X4, Z4).

[0115] The specific calculation formula is as follows: gravity moment M = mgcos(θ4-θ4);

[0116] Where: M——gravity moment;

[0117] m——trunk cover assembly weight;

[0118] g——acceleration due to gravity;

[0119] Θ4——Assembly optimization opening;

[0120] θ4——the angle between the line connecting the center of gravity coordinate P7 (X7, Z7) of the trunk lid assembly and the assembly optimization coordinate f5 (x4, y1, z3) and the XY plane;

[0121] The torsion bar moment T is calculated according to the following formula:

[0122]

[0123] Where: T – torsion bar moment;

[0124] d – the torsion bar diameter of the elbow hinge;

[0125] θ5——torsion bar closed angle;

[0126] G——shear modulus;

[0127] L n ——The span corresponding to the assembly optimization coordinate f5 (x4, y1, z3).

[0128] The friction torque and wind torque are converted through components and systems and are generally fixed constants. Based on the above formula, the maximum closing force of the trunk lid under the current assembly optimization coordinate f5 (x4, y1, z3) can be calculated. If the calculated maximum closing force of the trunk lid is greater than 20N, the closing requirement is met. Otherwise, x4 and z3 in the assembly optimization coordinate f5 (x4, y1, z3) are optimized to obtain the closing force optimization coordinate f6 (x5, y1, z4).

[0129] The final assembly optimized opening Θ4 and closing force optimized coordinates f6 (x5, y1, z4) are the final solution set, which is then verified. If it meets the conditions, it proves that the above solution set is the optimal solution. Otherwise, the rear styling CAS surface needs to be adjusted.

[0130] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis, characterized in that: According to the rear styling CAS surface, known design parameters and set constraints, the initial opening of the trunk lid θ0 and the initial coordinate of the hinge axis f0 are set; According to the hinge span design requirements in the design parameters, the initial hinge coordinate f0 is optimized to obtain the span optimization coordinate f1; Constructing a hinge layout plane according to the span optimization coordinate f1, and setting a hinge optimization area within the hinge layout plane; In the hinge optimization area, optimize the initial opening θ0 of the trunk lid and the span optimization coordinate f1 according to the following steps: S1, based on the human-machine target in the set constraint conditions, optimize the initial opening θ0 and the span optimization coordinate f1 of the luggage box to obtain the human-machine optimized opening θ2 and the human-machine optimized coordinate f2; S2, based on the setting requirement of the safety clearance of the hinge relative to the sealing strip in the setting constraint condition, the human-machine optimization coordinate f2 is optimized to obtain the motion safety optimization coordinate f3; S3, based on the safety clearance requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the ergonomic optimization opening θ2 and the motion safety optimization coordinate f3 are optimized to obtain the clearance safety optimization opening θ3 and the clearance safety optimization coordinate f4; S4, based on the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint condition, the gap safety optimization opening θ3 and the gap safety optimization coordinate f4 are optimized to obtain the assembly optimization opening θ4 and the assembly optimization coordinate f5; S5, optimizing the assembly optimization coordinate f5 based on the trunk lid closing force requirement in the design parameters to obtain the closing force optimization coordinate f6; S6. Verify the assembly optimized opening θ4 and the closing force optimized coordinate f6. If the design requirements are met, output the assembly optimized opening θ4 and the closing force optimized coordinate f6 as the optimal solution of the hinge axis. Otherwise, adjust the rear styling CAS surface. In the step S1, the man-machine height is calculated according to the coordinates of the initial point of the end when the trunk lid is closed, the Z-direction height from the ground line of the whole vehicle to the center line of the tire, the height difference when the trunk lid is fully opened, the span optimization coordinates f1 (x0, y1, z0) and the initial opening θ0 of the trunk in the design parameters. If the calculated man-machine height is within the set range of the man-machine height requirement, the man-machine height requirement is met. Otherwise, the initial opening θ0 of the trunk needs to be optimized until the man-machine height requirement is met, and the man-machine height optimized opening θ1 is obtained; In the step S1, the human-machine operating distance is calculated according to the coordinates of the initial point of the end when the trunk lid is closed, the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 in the design parameters. If the calculated human-machine operating distance is within the set range of the human-machine operating distance requirement, the human-machine operation requirement is met. Otherwise, it is necessary to optimize the x0 value in the span optimization coordinates f1 (x0, y1, z0) and the human-machine height optimization opening Θ1 until the human-machine operation requirement is met, and the human-machine optimization coordinates f2 (x1, y1, z0) and the human-machine optimization opening Θ2 are obtained.

2. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis according to claim 1, characterized in that: The method for constructing a layout plane of the hinge according to the span optimization coordinate f1 includes: constructing an XZ plane including the span optimization coordinate f1 as the layout plane of the hinge based on the Y value in the span optimization coordinate f1.

3. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis according to claim 1 or 2, characterized in that: The method for setting a hinge optimization area within a hinge arrangement plane includes: within the hinge arrangement plane, taking a line connecting a rear windshield starting point and a rear windshield end point of an intersection line of the rear windshield and the hinge arrangement plane as an upper boundary line, offsetting the upper boundary line downward in the Z direction to construct a lower boundary line, and an area between the upper boundary line and the lower boundary line within the hinge arrangement plane as the hinge optimization area.

4. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis according to claim 3, characterized in that: The method for optimizing the initial hinge coordinate f0 according to the hinge span design requirements in the design parameters includes: determining the initial span corresponding to the coordinate according to the y0 value in the initial hinge coordinate f0 (x0, y0, z0), comparing the ratio of the initial span to the trunk lid width in the design parameters with the hinge span design requirements, if the ratio is within the range of the hinge span design requirements, the span design requirements are met, otherwise it is necessary to increase the absolute value of the y0 coordinate until the hinge span design requirements are met, and obtain the optimized span coordinate f1 (x0, y1, z0).

5. The method for calculating and optimizing the layout of the trunk lid elbow hinge axis according to claim 1, characterized in that: In the step S2, the distance between the sealing strip installation point coordinates and the ergonomic optimization coordinates f2 (x1, y1, z0) is calculated according to the sealing strip installation point coordinates and the ergonomic optimization coordinates f2 (x1, y1, z0) in the design parameters. If the calculated distance meets the safety clearance setting requirements for the movement of the hinge relative to the sealing strip in the set constraint conditions, the motion clearance requirements are met. Otherwise, the x1 value and the z0 value in the ergonomic optimization coordinates f2 (x1, y1, z0) are optimized until the motion clearance requirements are met, and the motion safety optimization coordinates f3 (x2, y1, z1) are obtained.

6. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis according to claim 5, characterized in that: In the step S3, the minimum distance between the initial point of the front end of the trunk lid and the rear windshield when the trunk lid is opened is calculated based on the coordinates of the starting point of the rear windshield and the end point of the rear windshield of the intersection line of the rear windshield and the hinge layout plane and the motion safety optimization coordinates f3 (x2, y1, z1). If the calculated minimum distance meets the safety gap requirement between the trunk lid and the rear windshield during the opening process in the set constraint conditions, the safety gap requirement is met. Otherwise, x2 and z1 in the motion safety optimization coordinates f3 (x2, y1, z1) and the ergonomic optimization opening Θ2 are optimized to obtain the gap safety optimization opening Θ3 and the gap safety optimization coordinates f4 (x3, y1, z2).

7. A method for calculating and optimizing the layout of a trunk lid elbow hinge axis according to claim 6, characterized in that: In the step S4, the minimum distance between the hinge axis and the rear windshield is calculated based on the coordinates of the starting point and the end point of the rear windshield of the intersection of the rear windshield and the hinge layout plane and the gap safety optimization coordinates f4 (x3, y1, z2). If the calculated minimum distance is greater than the assembly space distance requirement between the hinge axis and the rear windshield in the set constraint conditions, the assembly clearance requirement is met. Otherwise, x3 and z2 in the gap safety optimization coordinates f4 (x3, y1, z2) and the gap safety optimization opening Θ3 are optimized to obtain the assembly optimization opening Θ4 and the assembly optimization coordinates f5 (x4, y1, z3).

8. The method for calculating and optimizing the layout of the trunk lid elbow hinge axis according to claim 7, characterized in that: In step S5, the maximum closing force of the trunk lid when fully open is calculated based on the weight of the trunk lid assembly, the coordinates of the center of gravity of the trunk lid assembly, the torsion bar diameter, the torsion bar closed angle, the coordinates of the initial point of the end when the trunk lid is closed, the assembly optimization opening θ4, and the assembly optimization coordinates f5 (x4, y1, z3) in the design parameters. If the calculated maximum closing force of the trunk lid when fully open meets the trunk lid closing force requirement in the set constraint conditions, the closing requirement is met; otherwise, x4 and z3 in the assembly optimization coordinates f5 (x4, y1, z3) are optimized to obtain the closing force optimization coordinates f6 (x5, y1, z4).

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