CN114241152A - Marking method and device for side edge datum line of automobile pedestrian protection engine cover - Google Patents

Abstract

The invention discloses a method and a device for scribing a lateral edge datum line of an automobile pedestrian protection engine cover, wherein the method comprises the following steps: intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; decomposing the engine hood intersecting lines aiming at each engine hood intersecting line to obtain a plurality of unit nodes; generating a regulation line of a target side surface of the engine hood model in a YZ plane corresponding to the engine hood intersection line; obtaining a target tangent point according to the plurality of unit nodes and the rule lines; the target tangent point is the node with the minimum distance from the rule line in the plurality of unit nodes; and generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines. The method of the invention does not need manual participation in the scribing process, can realize automatic scribing, and has higher scribing efficiency and scribing precision.

Description

Marking method and device for side edge datum line of automobile pedestrian protection engine cover

Technical Field

The invention relates to the technical field of vehicle engineering, in particular to a marking method and a marking device for a side edge datum line of an automobile pedestrian protection engine cover.

Background

Pedestrian protection is an important consideration in the field of automobile development and safety. In pedestrian collision simulation analysis, accurate marking of a collision region is a key technology. The engine hood side edge datum line is an important component in a regulation definition datum line, and a marking method for the engine hood side edge datum line in the prior art is to introduce a whole vehicle model into corresponding mechanical design software and then manually mark according to corresponding standards and regulations, namely automobile-pedestrian collision protection (GBT 2450702009). The marking mode needs manual work to determine the marking position according to the standard, and has low operation efficiency and high cost.

Disclosure of Invention

In view of the problems, the invention provides the method and the device for scribing the side edge datum line of the automobile pedestrian protection engine hood, the scribing process does not need manual participation, automatic scribing can be realized, and the scribing efficiency and the scribing precision are higher.

In a first aspect, the present application provides the following technical solutions through an embodiment:

a marking method for a side edge datum line of an automobile pedestrian protection engine cover comprises the following steps:

intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model; for each engine hood intersection line, decomposing the engine hood intersection line to obtain a plurality of unit nodes; generating a regulation line of a target side surface of the engine hood model in a YZ plane corresponding to the engine hood intersection line, wherein the target side surface is any one side surface of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model; obtaining target tangent points according to the unit nodes and the rule lines; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes; and generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

Optionally, the preset inclination angle is 45 °.

Optionally, the obtaining a target tangent point according to the plurality of unit nodes and the rule line includes:

and determining the unit node closest to the gauge line from the unit nodes by adopting a beating method to obtain a target tangent point.

Optionally, the generating a hood side edge reference line of the target side according to the target tangent points corresponding to the multiple hood intersecting lines includes:

connecting or fitting the target tangent points corresponding to the multiple engine hood intersecting lines to obtain a first engine hood side edge datum line; and translating the first hood side edge datum line along the surface of the hood model and perpendicular to the first hood side edge datum line by a preset distance towards the center direction of the surface of the hood to obtain a second hood side edge datum line.

Optionally, after generating the hood side edge reference line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines, the method further includes:

and mirroring the hood side edge datum line of the target side surface according to an XZ plane passing through the middle point of the width of the hood model, and obtaining the hood side edge datum line of the symmetrical side surface corresponding to the target side surface.

In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:

an automotive pedestrian protection hood side edge reference line scribing device, comprising:

the first decomposition module is used for intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model; the second decomposition module is used for decomposing the engine hood intersecting lines to obtain a plurality of unit nodes; the engine hood model control device comprises a regulation line generating module, a control module and a control module, wherein the regulation line generating module is used for generating a regulation line of a target side face of the engine hood model in a YZ plane corresponding to the engine hood intersection line, and the target side face is any side face of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model; the tangent point obtaining module is used for obtaining a target tangent point according to the unit nodes and the rule line; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes; and the scribing module is used for generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

Optionally, the preset inclination angle is 45 °.

Optionally, the tangent point obtaining module is specifically configured to:

and determining the unit node closest to the gauge line from the unit nodes by adopting a beating method to obtain a target tangent point.

Optionally, the scribing module is specifically configured to:

connecting or fitting the target tangent points corresponding to the multiple engine hood intersecting lines to obtain a first engine hood side edge datum line; and translating the first hood side edge datum line along the surface of the hood model and perpendicular to the first hood side edge datum line by a preset distance towards the center direction of the surface of the hood to obtain a second hood side edge datum line.

In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:

an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of the first aspects above.

According to the marking method and device for the lateral edge datum line of the automobile pedestrian protection engine cover, provided by the embodiment of the invention, the automatic marking of the lateral edge datum line of the engine cover can be realized, manual participation is not needed, and the marking efficiency and the marking precision are higher; the distance between the XZ planes can be adjusted, the discrete precision of the intersecting line of the engine hood can be adjusted, variable customization can be realized, and dynamic adjustment can be realized according to actual conditions and precision requirements, so that the precision of division of the engine hood lateral edge datum line can be adjusted.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:

FIG. 1 is a schematic illustration of a principle of legislation defining hood side edge datum lines;

FIG. 2 is a flow chart illustrating a method for marking a side edge datum line of a pedestrian protection hood of an automobile according to an embodiment of the present invention;

FIG. 3 illustrates an exemplary reference coordinate diagram of a hood model in an embodiment of the present invention;

FIG. 4 is a schematic view showing the structure of a hood model in an embodiment of the present invention;

FIG. 5 illustrates a schematic positional view of portions of a YZ plane and a normal line on a hood model in an embodiment of the present invention;

FIG. 6 illustrates a schematic diagram of a first hood skirt reference line acquisition in an embodiment of the present invention;

FIG. 7 is a schematic position diagram showing a first hood side edge reference line and a second hood side edge reference line on a hood model according to an embodiment of the present invention;

FIG. 8 shows a schematic view of a second hood skirt datum line in an embodiment of the present invention;

FIG. 9 is an enlarged schematic view of the area A, B in FIG. 4;

fig. 10 is a schematic structural diagram illustrating functional modules of a marking device for a lateral edge datum line of a pedestrian protection hood of an automobile according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The invention provides a marking method and a marking device for a side edge datum line of an automobile pedestrian protection engine hood, wherein the executed method steps or the realized functions can be carried and realized based on a developed program. Specifically, the envelope curve of the pedestrian protection engine hood can be automatically divided based on a Tcl/Tk secondary development tool provided by Hypermesh finite element analysis software and through Tcl script development. The definition of the hood side edge reference line by the regulation "automobile to pedestrian impact protection" (GBT 24502009) is that when a straight ruler 700mm long is parallel to the vehicle transverse vertical plane and is tilted 45 ° inward and held in contact with the side of the vehicle front structure, the geometric locus formed by the highest contact point of the straight ruler with the vehicle side, i.e. the hood side edge reference line, is shown in fig. 1. The concept of the invention is explained in detail below by means of a specific embodiment.

Referring to fig. 2, a flowchart of a method for scribing a lateral edge datum line of a pedestrian protection hood of an automobile according to an embodiment of the present invention is shown, where the method specifically includes:

step S10: intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model;

step S20: for each engine hood intersection line, decomposing the engine hood intersection line to obtain a plurality of unit nodes;

step S30: generating a regulation line of a target side surface of the engine hood model in a YZ plane corresponding to the engine hood intersection line, wherein the target side surface is any one side surface of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model;

step S40: obtaining target tangent points according to the unit nodes and the rule lines; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes;

step S50: and generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

In the embodiment, the automatic marking of the engine hood side edge datum line can be realized through the steps S10-S50, manual participation is not needed, and the marking efficiency and the marking precision are high; the distance between the XZ planes can be adjusted, the discrete precision of the intersecting line of the engine hood can be adjusted, variable customization can be realized, and dynamic adjustment can be realized according to actual conditions and precision requirements, so that the precision of division of the engine hood lateral edge datum line can be adjusted. The implementation of each step of the present embodiment is illustrated and described in detail below.

Step S10: intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model.

In step S10, a coordinate system may be defined for convenience, as shown in fig. 3; the length direction of the whole vehicle corresponding to the engine hood model is an X axis of a coordinate system, the width direction of the whole vehicle corresponding to the engine hood model is a Y axis of the coordinate system, and the height direction of the whole vehicle corresponding to the engine hood model is a Z axis of the coordinate system; wherein the XZ plane is a plane parallel to the Y-reference plane, the YZ plane is a plane parallel to the X-reference plane, and the XY plane is a plane parallel to the Z-reference plane, as shown in fig. 3. Of course, in other implementations, other reference coordinate systems may be defined, and are not limited.

The engine cover model can be a CAD (Computer Aided Design) model, then is guided into Hypermesh finite element analysis software, and is subjected to geometric cleaning (cleaning redundant points, lines, surfaces, bodies and the like) to obtain a model; the hood model may include only component information of the hood of the vehicle, as shown in fig. 4, and does not include information such as mesh division, material, attribute, and the like, so as to improve processing efficiency.

Further, the plurality of YZ planes may be equally spaced planes or unequally spaced planes; in the embodiment, planes with equal spacing can be adopted, so that the calculation precision is ensured and the processing complexity is reduced; the size of the equidistant space is an adjustable variable, and during specific implementation, the size can be adjusted according to the precision requirement so as to improve the adaptability and the expandability. The smaller the distance setting, the higher the precision, but the calculation amount and the time consumed by calculation are multiplied; too large distance setting will result in that the marking accuracy can't be guaranteed. Therefore, in the present embodiment, the pitch between two adjacent YZ planes may be set to be between 10mm and 50mm, for example, 10mm, 20mm, 50mm, and the like. The number of hood intersections is the hood width/distance between two adjacent YZ planes. If manual processing is adopted, the minimum distance is set to 100mm, and the workload is very huge for a simulation worker; however, for automatic division, only the distance variable needs to be changed, and the time consumption and cost are far less than those of manual operation.

After the plurality of YZ planes intersect with the hood model, an intersection line formed on the upper surface of the hood model is a hood intersection line, and the position of a part of the YZ plane is shown in fig. 5. When the plurality of YZ planes are equally spaced planes, the number of intersecting lines is the width of the intersecting hood model divided by the spacing between the plurality of YZ planes, and the number of hood intersecting lines can be changed by adjusting the spacing, thereby realizing the adjustment of the scribing accuracy.

Step S20: and decomposing the engine hood intersection lines aiming at each engine hood intersection line to obtain a plurality of unit nodes.

In step S20, the following process may be performed for each of the hood intersections to determine a unit node: and carrying out unary linear grid division on the intersecting line of the engine cover to obtain a plurality of unit nodes. When linear grid division is performed, the size of the grid unit can be a dynamically adjustable parameter, and can be set according to actual conditions and precision requirements, for example, in some implementations, the size can be set to 0.5mm, and the intersecting line of the engine can be dispersed into a plurality of unit nodes at equal intervals.

Step S30: generating a regulation line of a target side surface of the engine hood model in a YZ plane corresponding to the engine hood intersection line, wherein the target side surface is any one side surface of the engine hood model; and the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model.

In step S30, the rule and rule line is the orthographic projection of the 700mm ruler in the rule and rule in the YZ plane; in particular, the predetermined inclination of the normal to the XY plane may be 45, as shown in FIG. 5 for the position of a portion of the normal. It should be noted that, under the condition of some special requirements or changes of laws and regulations, the preset inclination angle can be adjusted correspondingly without limitation. The target side is any side on the vehicle, and after one side is scribed, the engine cover side edge datum line of the other side can be obtained through mirror image processing, so that the calculated amount is reduced, and the processing efficiency is improved.

Further, the expression of orthographic projection of the regulatory line in the YZ plane in a certain hood model may be: y-z +1850.383 ═ 0; the schematic diagram is shown in FIG. 6; at this time, the distance from the unit node on the hood intersection to the regulation line may be expressed as:

next, step S40 is executed.

Step S40: obtaining target tangent points according to the unit nodes and the rule lines; the target tangent point is a node with the minimum distance from the regulation line in the plurality of unit nodes.

In step S40, a unit node closest to the rule line may be determined from the plurality of unit nodes by using a scoring method, and the closest unit node is the target tangent point. By the method, the point on the engine hood side edge datum line, namely the target tangent point, can be accurately found. In addition, the calculation can be performed unit by unit, the unit node closest to the regulation line can be found, and a larger calculation amount is generated compared with the method adopting the beating method.

Step S50: and generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

In step S50, the hood side edge reference line may include a first hood side edge reference line and a second hood side edge reference line. Specifically, a legally defined hood side edge datum line, generally referred to as a sideline side edge datum line, in this embodiment, a first hood side edge datum line; further, a line obtained by contracting the sideline reference line toward the hood inner side by 82.5mm is a second hood side edge base line, sideline — 82.5, as shown in fig. 7. The specific execution of step S50 is as follows:

first, target tangent points corresponding to a plurality of engine cover intersecting lines are connected or fitted to obtain a first engine cover side edge datum line. Then, the first hood side edge reference line is translated (shifted) by a predetermined distance in the center direction of the hood surface along the surface of the hood model and perpendicular to the first hood side edge reference line, and a second hood side edge reference line is obtained. Further, it is also possible to make a circle having a radius of 82.5mm with a point on the side edge reference line of the first hood as the center, and to obtain the second engine side edge reference line after obtaining all the intersections, which are points on the side edge reference line of the second hood, as shown in fig. 8.

At this time, the obtained first hood side edge reference line and second hood side edge reference line are hood side edge reference lines of the target side surface; then, the hood side edge reference line of the symmetrical side surface corresponding to the target side surface can be obtained by mirroring the hood side edge reference line of the target side surface on the XZ plane passing through the midpoint of the width of the hood model. Thereby quickly obtaining the hood side edge reference line of the other side surface (symmetrical side surface) of the hood.

Referring to fig. 9, the following is illustrated on a scale; fig. 8 shows a schematic diagram of a manual marking of a hood side edge reference line of A, B areas on a hood and a schematic diagram of an automatic marking implemented by using the method of the embodiment. It can be seen that when the lines are scribed at the turning positions of A, B, the lateral edge reference lines of the hood obtained by manual line scribing are not completely attached to the surface of the hood, and a large error exists; the engine hood side edge datum line obtained by automatic marking through the method of the embodiment still well achieves transition turning at the turning position, only is attached to the surface of the engine hood, and the marking accuracy is obviously higher than that of manual marking in the prior art.

In summary, according to the method for scribing the baseline of the lateral edge of the pedestrian protection engine cover of the automobile provided by the embodiment of the invention, a plurality of intersecting lines of the engine cover are obtained by intersecting a plurality of YZ planes with the engine cover model; the YZ plane is parallel to a plane formed by the width direction of the whole vehicle and the height direction of the whole vehicle corresponding to the engine cover model; then, decomposing the engine hood intersecting lines aiming at each engine hood intersecting line to obtain a plurality of unit nodes; generating a regulation line of a target side face of the engine hood model in a YZ plane corresponding to the intersecting line of the engine hood, wherein the target side face is any side face of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model; thereby fulfilling the requirements defined in the legislation. Then, obtaining a target tangent point according to the plurality of unit nodes and the legal line; the target tangent point is the node with the minimum distance from the rule line in the plurality of unit nodes; and finally, generating a hood side edge datum line of the target side according to the target tangent points corresponding to the multiple hood intersecting lines. The whole scribing process can realize automatic positioning of the gauge line and automatic searching of the target tangent point, so that the engine hood side edge datum line is obtained, and the scribing efficiency is high; in addition, parameters such as the distance between YZ planes and the discrete precision of an engine hood intersection line can be adjusted in the scribing process, so that the scribing precision can be adjusted, and the self-adaption and expandability of the scribing method are improved; the method can completely get rid of the manual operation of a simulation engineer, reduce the errors generated by the manual operation and improve the accuracy of dividing the lateral margin datum line.

Referring to fig. 10, based on the same inventive concept, in another embodiment of the present invention, there is provided an automotive pedestrian protection hood side edge reference line marking device 300, wherein the automotive pedestrian protection hood side edge reference line marking device 300 includes:

the first decomposition module 301 is used for intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model; a second decomposition module 302, configured to decompose each of the engine hood intersection lines to obtain a plurality of unit nodes; a regulatory line generating module 303, configured to generate a regulatory line of a target side surface of the hood model in a YZ plane corresponding to the hood intersection line, where the target side surface is any one side surface of the hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model; a tangent point obtaining module 304, configured to obtain a target tangent point according to the plurality of unit nodes and the rule line; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes; the scribing module 305 is configured to generate a hood side edge reference line of the target side surface according to the target tangent points corresponding to the plurality of hood intersecting lines.

As an alternative embodiment, the preset inclination angle is 45 °.

As an optional implementation manner, the tangent point obtaining module 304 is specifically configured to:

and determining the unit node closest to the gauge line from the unit nodes by adopting a beating method to obtain a target tangent point.

As an optional implementation manner, the scribing module 305 is specifically configured to:

connecting or fitting the target tangent points corresponding to the multiple engine hood intersecting lines to obtain a first engine hood side edge datum line; and translating the first hood side edge datum line along the surface of the hood model and perpendicular to the first hood side edge datum line by a preset distance towards the center direction of the surface of the hood to obtain a second hood side edge datum line.

As an optional implementation, the vehicle hood further comprises a mirror module, configured to, after the hood side edge reference line of the target side surface is generated according to the target tangent points corresponding to the plurality of hood intersecting lines:

and mirroring the hood side edge datum line of the target side surface according to an XZ plane passing through the middle point of the width of the hood model, and obtaining the hood side edge datum line of the symmetrical side surface corresponding to the target side surface.

It should be noted that the implementation and technical effects of the marking device 300 for the lateral edge datum line of the pedestrian protection hood of the automobile according to the embodiment of the present invention are the same as those of the foregoing method embodiment, and for the sake of brief description, reference may be made to the corresponding contents of the foregoing method embodiment where no mention is made in part of the device embodiment.

Based on the same inventive concept, in yet another embodiment of the present invention, there is also provided an electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of the preceding embodiments.

It should be noted that, in the electronic device provided in the embodiment of the present invention, when the instructions are executed by the processor, the specific implementation of each step and the generated technical effect are the same as those of the foregoing method embodiment, and for the sake of brief description, for the sake of brevity, reference may be made to the corresponding contents in the foregoing method embodiment for the non-mentioned part of the present embodiment.

The term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A marking method for a side edge datum line of an automobile pedestrian protection engine cover is characterized by comprising the following steps:

intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model;

for each engine hood intersection line, decomposing the engine hood intersection line to obtain a plurality of unit nodes;

generating a regulation line of a target side surface of the engine hood model in a YZ plane corresponding to the engine hood intersection line, wherein the target side surface is any one side surface of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model;

obtaining target tangent points according to the unit nodes and the rule lines; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes;

and generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

2. The method according to claim 1, characterized in that said preset inclination angle is 45 °.

3. The method of claim 1, wherein said obtaining a target tangent point from the plurality of unit nodes and the normative line comprises:

and determining the unit node closest to the gauge line from the unit nodes by adopting a beating method to obtain a target tangent point.

4. The method according to claim 1, wherein the generating a hood side edge reference line of the target side surface based on the target tangent points corresponding to the plurality of hood intersections includes:

connecting or fitting the target tangent points corresponding to the multiple engine hood intersecting lines to obtain a first engine hood side edge datum line;

and translating the first hood side edge datum line along the surface of the hood model and perpendicular to the first hood side edge datum line by a preset distance towards the center direction of the surface of the hood to obtain a second hood side edge datum line.

5. The method according to claim 1, wherein after generating the hood side edge reference line of the target side surface based on the target tangent points corresponding to the plurality of hood intersecting lines, the method further comprises:

and mirroring the hood side edge datum line of the target side surface according to an XZ plane passing through the middle point of the width of the hood model, and obtaining the hood side edge datum line of the symmetrical side surface corresponding to the target side surface.

6. The utility model provides a car pedestrian protects engine cover lateral margin datum line marking device which characterized in that includes:

the first decomposition module is used for intersecting the multiple YZ planes with the engine hood model to obtain multiple engine hood intersecting lines; the YZ plane is parallel to a plane formed by the whole vehicle width direction and the whole vehicle height direction corresponding to the engine hood model;

the second decomposition module is used for decomposing the engine hood intersecting lines to obtain a plurality of unit nodes;

the engine hood model control device comprises a regulation line generating module, a control module and a control module, wherein the regulation line generating module is used for generating a regulation line of a target side face of the engine hood model in a YZ plane corresponding to the engine hood intersection line, and the target side face is any side face of the engine hood model; the included angle between the normal line and the XY plane accords with a preset dip angle, and the XY plane is parallel to a plane formed by the width direction of the whole vehicle and the length direction of the whole vehicle corresponding to the engine hood model;

the tangent point obtaining module is used for obtaining a target tangent point according to the unit nodes and the rule line; the target tangent point is the node with the minimum distance from the regulation line in the plurality of unit nodes;

and the scribing module is used for generating a hood side edge datum line of the target side surface according to the target tangent points corresponding to the multiple hood intersecting lines.

7. The device according to claim 6, characterized in that said preset inclination angle is 45 °.

8. The apparatus of claim 6, wherein the tangent point obtaining module is specifically configured to:

and determining the unit node closest to the gauge line from the unit nodes by adopting a beating method to obtain a target tangent point.

9. The apparatus of claim 6, wherein the scribing module is specifically configured to:

connecting or fitting the target tangent points corresponding to the multiple engine hood intersecting lines to obtain a first engine hood side edge datum line;

and translating the first hood side edge datum line along the surface of the hood model and perpendicular to the first hood side edge datum line by a preset distance towards the center direction of the surface of the hood to obtain a second hood side edge datum line.

10. An electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any of claims 1-5.

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