A method and system for generating drive shaft envelope

Abstract

The present invention discloses a method and system for generating a drive shaft envelope, comprising: obtaining parameters corresponding to a vehicle to be verified under various typical working conditions; obtaining relative position information between the drive shaft of the vehicle to be verified and related components under the action of the parameters corresponding to the various typical working conditions; obtaining actual motion trajectories of inner and outer ball joints of the drive shaft over time under various typical working conditions through the relative position information between the drive shaft of the vehicle to be verified and related components; obtaining central coordinates of the inner and outer ball joints of the drive shaft over time under various typical working conditions based on the actual motion trajectory, and drawing the motion envelopes of the inner and outer ball joints of the drive shaft model under various typical working conditions in combination with the drive shaft model; obtaining the motion envelope of the drive shaft model under various typical working conditions by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model.

Description

Technical Field

[0001] The present application relates to the field of vehicle design and development, and in particular to a method and system for generating a drive shaft envelope. Background Art

[0002] The drive shaft envelope refers to the spatial motion trajectory of the drive shaft as it moves with the wheels and powertrain in various driving conditions. The rationality of the spatial layout is judged by the interference between the drive shaft and surrounding components. If the layout is unreasonable, for example, there are interference risks such as friction and collision, it will affect the driving safety of the entire vehicle.

[0003] For the drive shaft, the actual motion characteristics of the drive shaft are that the inner ball joint end vibrates with the powertrain, and the outer ball joint end moves with the wheel. The movement of the drive shaft itself is the coupling of the two motions. However, the current drive shaft envelope drawing only considers the single factor that the drive shaft moves with the wheel. The resulting drive shaft envelope has a large deviation from the actual situation and cannot cover the actual situation of the drive shaft movement. Summary of the invention

[0004] The present invention provides a method and system for generating a drive shaft envelope, which directly associates the motion of the inner and outer ball joints of the drive shaft with typical working conditions, respectively. By referring to the actual motion trajectories of the inner and outer ball joints of the drive shaft following time under typical working conditions, the motion characteristics of the inner and outer ball joints under each typical working condition are obtained. Then, the motion characteristics of the inner and outer ball joints under each typical working condition are combined, and an accurate drive shaft motion envelope is obtained by first decoupling and then coupling, thereby solving or partially solving the technical problem that the drawing of the drive shaft envelope in the prior art cannot cover the actual situation of the drive shaft motion.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a method for generating a drive shaft envelope, the method comprising:

[0006] Obtain the parameters corresponding to the vehicle to be verified under various typical working conditions;

[0007] Under the action of the parameters corresponding to the various typical working conditions, the relative position information between the drive shaft of the vehicle to be verified and related parts is obtained; the related parts are: a powertrain connected to the inner ball joint of the drive shaft of the vehicle to be verified and a tire connected to the outer ball joint of the drive shaft of the vehicle to be verified;

[0008] The actual motion trajectory of the inner and outer ball joints of the drive shaft following time under the various typical working conditions is obtained through the relative position information between the drive shaft of the vehicle to be verified and related parts;

[0009] Based on the actual motion trajectory, the central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions are obtained, and the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions are drawn in combination with the drive shaft model;

[0010] Under the various typical working conditions, the motion envelope of the drive shaft model is obtained by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model; wherein the motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working conditions formed by the powertrain and wheel movement.

[0011] Preferably, the various typical working conditions are obtained by combining the wheel motion law and the powertrain vibration law;

[0012] The motion law of the wheel includes bouncing up and down with the suspension system, rotating with the steering system, and the superposition of the two motions;

[0013] The vibration law of the powertrain includes: the rotation of the powertrain around the powertrain mass center, the rotation is decomposed into rotation around the X-axis, Y-axis, and Z-axis, and includes the movement of the powertrain mass center in the X-axis, Y-axis, and Z-axis directions.

[0014] Preferably, the various typical operating conditions represent the conditions of actual movement of the drive shaft, including: full throttle 0-100 acceleration conditions, maximum braking force 100-0 braking conditions, full throttle reverse gear conditions, turning conditions, pothole and bump conditions, bump conditions, and superimposed conditions of the above conditions, including full throttle left turn conditions, full throttle right turn conditions, full throttle pothole and bump conditions, and full throttle bump conditions.

[0015] Preferably, the parameters corresponding to the automobile under various typical working conditions to be verified include driving parameters and road parameters under various typical working conditions; wherein the driving parameters and road parameters under different working conditions are different.

[0016] Preferably, the relative position information between the drive shaft of the vehicle to be verified and related components is obtained under the action of the parameters corresponding to the various typical working conditions, specifically including:

[0017] Selecting rigid positioning points on the vehicle body-in-white, the wheels, and the powertrain;

[0018] Based on the rigid positioning points, measuring the motion parameters of the wheels and the powertrain relative to the vehicle body-in-white during driving of the vehicle, wherein the motion parameters are coordinate information that changes with time;

[0019] Based on the spatial position relationship between the powertrain and the inner ball joint, and between the wheel and the outer ball joint, the relative position information of the inner and outer ball joints of the drive shaft relative to the automobile body-in-white that changes with time is obtained.

[0020] Preferably, based on the rigid positioning point, the motion parameters of the wheels and the powertrain relative to the vehicle body-in-white are measured during the driving of the vehicle, and the motion parameters are coordinate information that changes with time, specifically including:

[0021] Obtaining absolute coordinate information of rigid positioning points on the automobile body-in-white, the wheels, and the powertrain;

[0022] When the automobile body-in-white is absolutely stationary, the movement of the wheels and the powertrain relative to the automobile body-in-white is combined with the absolute coordinate information of the rigid positioning points on the automobile body-in-white, the wheels, and the powertrain to calculate the relative coordinate information of the rigid positioning points on the wheels and the powertrain relative to the rigid positioning points on the automobile body-in-white.

[0023] Preferably, the spatial position relationship between the power assembly and the inner ball joint is based on the relative static motion relationship between the power assembly and the inner ball joint, and the center coordinates of the inner ball joint are calculated from the relative coordinate information coordinates of the rigid positioning point on the power assembly;

[0024] Preferably, the spatial position relationship between the wheel and the outer ball joint is based on the relatively static motion relationship between the wheel and the outer ball joint, and the center coordinates of the outer ball joint are calculated from the relative coordinate information of the rigid positioning point on the wheel.

[0025] Preferably, the drive shaft model has different motion envelopes under different typical working conditions.

[0026] A second aspect of the present invention discloses a system for generating a drive shaft envelope, comprising:

[0027] The first acquisition unit is used to acquire the parameters corresponding to the vehicle to be verified under various typical working conditions;

[0028] A second acquisition unit is used to acquire relative position information between the drive shaft of the vehicle to be verified and related parts under the action of the parameters corresponding to the various typical working conditions; the related parts are: a powertrain connected to the inner ball joint of the drive shaft of the vehicle to be verified and a tire connected to the outer ball joint of the drive shaft of the vehicle to be verified;

[0029] A third acquisition unit is used to acquire the actual motion trajectory of the inner and outer ball joints of the drive shaft following time under the various typical working conditions through the relative position information between the drive shaft of the vehicle to be verified and related parts;

[0030] A drawing unit, for obtaining the time-varying central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions based on the actual motion trajectory, and drawing the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions in combination with the drive shaft model;

[0031] The envelope generation unit is used to obtain the motion envelope of the drive shaft model by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions; wherein the motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working condition formed by the powertrain and wheel movement.

[0032] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0033] The present invention discloses a method and system for generating a drive shaft envelope, in which the motion of the inner and outer ball joints of the drive shaft are directly associated with typical working conditions, respectively. The motion characteristics of the inner and outer ball joints of the drive shaft under each typical working condition are obtained by following the actual motion trajectories of the inner and outer ball joints of the drive shaft over time under typical working conditions, and then the motion characteristics of the inner and outer ball joints under each typical working condition are combined to obtain an accurate drive shaft motion envelope by first decoupling and then coupling.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0036] In the attached picture:

[0037] Figure 1 A flow chart of a method for generating a drive shaft envelope according to an embodiment of the present invention is shown;

[0038] Figure 2 A schematic diagram of a system for generating a drive shaft envelope according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0040] Please see below Figure 1 The embodiment of the present invention discloses a method for generating a drive shaft envelope, comprising the following steps:

[0041] Step 101, obtaining parameters corresponding to the vehicle to be verified under various typical working conditions.

[0042] In this embodiment, a car body that has been welded but not painted (excluding moving parts such as four doors and two covers), that is, the car body in white, is used as the car to be verified. The advantage is that the structure is simple and can avoid interference caused by unnecessary parts of the car body, such as four doors and two covers, interior and exterior decoration, electronic and electrical systems, etc., so that the drawn drive shaft envelope is more accurate.

[0043] In this embodiment, various typical working conditions are obtained by combining the wheel motion law and the powertrain vibration law. The wheel motion law includes bouncing up and down with the suspension system, rotating with the steering system, and the superposition of the two motions. The powertrain vibration law includes: the rotation of the powertrain around the powertrain mass center, and the movement of the powertrain mass center. Among them, the rotation of the powertrain around the powertrain mass center can be decomposed into the rotation around the X-axis, Y-axis, and Z-axis of the vehicle coordinate system. The vehicle coordinate system is a special moving coordinate system used to describe the movement of the vehicle. Its origin coincides with the mass center. When the vehicle is stationary on a horizontal road, the X-axis is parallel to the ground and points to the front of the vehicle, the Z-axis passes through the vehicle mass center and points upward, and the Y-axis points to the left of the driver; on this basis, the movement of the powertrain mass center can be decomposed into the movement of the powertrain mass center in the X-axis, Y-axis, and Z-axis directions of the vehicle coordinate system. In this embodiment, by combining the wheel motion law and the powertrain vibration law, various typical working conditions that can represent the real movement of the drive shaft are found. Each typical operating condition can be divided into acceleration condition, deceleration condition, turning condition, and bumpy condition, specifically including: full throttle 0-100 acceleration condition, maximum braking force 100-0 braking condition, full throttle reverse gear condition, turning condition, pothole and bumpy condition, bumpy condition, and the superposition of the above conditions, including full throttle left turn condition, full throttle right turn condition, full throttle pothole and bumpy condition, and full throttle bumpy condition.

[0044] In this embodiment, the parameters of the vehicle to be verified are different under various typical working conditions. Specifically, the parameters of the vehicle to be verified in this embodiment include driving parameters and road parameters, such as throttle opening, braking force, steering angle, road pit size (length, width, height), road bag size (length, width, height). Different typical working conditions correspond to their respective driving parameters and road parameters. For example, under the full throttle 0-100 acceleration condition and the maximum braking force 100-0 braking condition, the corresponding parameters of the vehicle to be verified are different.

[0045] In this embodiment, various typical working conditions can be obtained by combining the wheel motion law and the powertrain vibration law; then, according to various typical working conditions, the driving parameters and road parameters of the vehicle to be verified are designed to prepare for the subsequent motion envelope.

[0046] Step 102, obtaining relative position information between the drive shaft and related components of the vehicle to be verified under the action of the parameters corresponding to the various typical working conditions.

[0047] The related parts include: a powertrain connected to an inner ball joint of a drive shaft of the vehicle to be verified and a tire connected to an outer ball joint of a drive shaft of the vehicle to be verified.

[0048] In order to obtain the relative position information between the inner ball joint of the drive shaft and the powertrain, and the relative position information between the outer ball joint and the tire, the embodiment of the present invention is implemented in the following manner.

[0049] Step 1, select rigid positioning points on the vehicle body in white, the wheels, and the powertrain.

[0050] Step 2: Based on the rigid positioning points, the motion parameters of the wheels and the powertrain relative to the vehicle body-in-white are measured during the driving of the vehicle. The rigid positioning points can be represented by coordinates, and the motion parameters are coordinate information that changes over time.

[0051] In step 2, the absolute coordinate information of the rigid positioning points on the automobile body-in-white, the wheels, and the powertrain is obtained. The absolute coordinate information refers to the coordinate information of the automobile body-in-white, the wheels, and the powertrain in a stationary state. When the automobile body-in-white is absolutely stationary, the movement of the wheels and the powertrain relative to the automobile body-in-white can obtain the motion parameters relative to the automobile body-in-white. Specifically, during the movement, the relative coordinate information of the rigid positioning points on the wheels and the powertrain relative to the rigid positioning points on the automobile body-in-white can be calculated in combination with the aforementioned absolute coordinate information. The relative coordinate information at this time can be used to characterize the motion parameters of the wheels and the powertrain relative to the automobile body-in-white.

[0052] Step 3, based on the spatial position relationship between the powertrain and the inner ball joint, the wheel and the outer ball joint, the relative position information of the inner and outer ball joints of the drive shaft relative to the automobile body-in-white that changes with time is obtained.

[0053] In step 3, the spatial position relationship between the powertrain and the inner ball joint is based on the relative static motion relationship between the powertrain and the inner ball joint. The center coordinates of the inner ball joint are calculated from the relative coordinate information of the rigid positioning points on the powertrain. The calculation method is three-dimensional space coordinate solution. The center coordinates of the inner ball joint and the motion parameters of the powertrain relative to the automobile body-in-white can be converted into the relative position information of the inner ball joint relative to the automobile body-in-white that changes with time. Similarly, the spatial position relationship between the wheel and the outer ball joint is based on the relative static motion relationship between the wheel and the outer ball joint. The center coordinates of the outer ball joint are calculated from the relative coordinate information of the rigid positioning points on the wheel. The calculation method is three-dimensional space coordinate solution. The center coordinates of the outer ball joint and the motion parameters of the wheel relative to the automobile body-in-white can be converted into the relative position information of the outer ball joint relative to the automobile body-in-white that changes with time.

[0054] In this embodiment, by decoupling the drive shaft into an inner ball joint and an outer ball joint, the motion relationship between the drive shaft and the automobile body is decomposed into the relative position information of the inner ball joint and the outer ball joint relative to the automobile body that changes over time, thereby covering the actual situation of the drive shaft movement.

[0055] Step 103, obtaining the actual motion trajectory of the inner and outer ball joints of the drive shaft over time under the various typical working conditions through the relative position information between the drive shaft of the vehicle to be verified and related components.

[0056] In this embodiment, the relative position information between the drive shaft and related components can be decoupled into the time-varying relative position information of the inner and outer ball joints (i.e., the inner ball joint and the outer ball joint) relative to the vehicle body, thereby drawing the actual motion trajectories of the inner and outer ball joints over time.

[0057] Step 104, based on the actual motion trajectory, obtain the central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions that change with time, and draw the motion envelope of the inner and outer ball joints of the drive shaft model under the various typical working conditions in combination with the drive shaft model.

[0058] In this embodiment, the actual motion trajectory refers to the actual motion trajectory of the center coordinates of the inner and outer ball joints as they change with time. It is worth noting that the inner and outer ball joints have different actual motion trajectories under different typical working conditions, so the motion envelope is distinguished according to the typical working conditions. Under each typical working condition, the center coordinates of the inner and outer ball joints of the drive shaft that change with time are obtained based on the corresponding actual motion trajectory, and the motion envelope of the inner and outer ball joints of the drive shaft model under the typical working condition can be drawn in combination with the drive shaft model. It is worth noting that the drive shaft model has different motion envelopes under different typical working conditions.

[0059] In this embodiment, by decoupling the drive shaft into an inner ball joint and an outer ball joint, and collecting the motion relationship between the inner ball joint and the powertrain at relative stillness, the motion relationship between the outer ball joint and the tire at relative stillness, and the motion parameters of the wheel and the powertrain relative to the vehicle body-in-white during the vehicle driving, the relative position information of the inner and outer ball joints relative to the vehicle body-in-white that changes with time is obtained, thereby obtaining the actual motion trajectory (i.e., motion characteristics) of the inner and outer ball joints under each typical working condition, and drawing the motion envelope of the inner and outer ball joints accordingly. It can be seen that the motion envelopes of the inner and outer ball joints drawn separately in this embodiment can cover the actual situation of the drive shaft movement.

[0060] Step 105 , under the various typical working conditions, the motion envelope of the drive shaft model is obtained by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model.

[0061] The motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working condition formed by the motion of the powertrain and the wheels.

[0062] In this embodiment, under the various typical working conditions, the motion envelopes of the inner and outer ball joints are coupled to obtain a drive shaft motion envelope that can cover the actual situation of the drive shaft movement under the coupled working conditions formed by the powertrain and wheel movement.

[0063] Based on the same inventive concept, the embodiment of the present invention also discloses a system for generating a drive shaft envelope, see Figure 2 ,include:

[0064] The first acquisition unit 201 is used to acquire the parameters corresponding to the vehicle to be verified under various typical working conditions;

[0065] The second acquisition unit 202 is used to acquire the relative position information between the drive shaft of the vehicle to be verified and related parts under the action of the parameters corresponding to the various typical working conditions; the related parts are: the powertrain connected to the inner ball joint of the drive shaft of the vehicle to be verified and the tire connected to the outer ball joint of the drive shaft of the vehicle to be verified;

[0066] The third acquisition unit 203 is used to acquire the actual motion trajectory of the inner and outer ball joints of the drive shaft following time under the various typical working conditions through the relative position information between the drive shaft of the vehicle to be verified and related parts;

[0067] A drawing unit 204 is used to obtain the central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions over time based on the actual motion trajectory, and draw the motion envelope of the inner and outer ball joints of the drive shaft model under the various typical working conditions in combination with the drive shaft model;

[0068] The envelope generation unit 205 is used to obtain the motion envelope of the drive shaft model by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions; wherein the motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working condition formed by the powertrain and wheel movement.

[0069] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0070] The present invention discloses a method and system for generating a drive shaft envelope, in which the motion of the inner and outer ball joints of the drive shaft are directly associated with typical working conditions, respectively. The motion characteristics of the inner and outer ball joints of the drive shaft under each typical working condition are obtained by following the actual motion trajectories of the inner and outer ball joints of the drive shaft over time under typical working conditions, and then the motion characteristics of the inner and outer ball joints under each typical working condition are combined to obtain an accurate drive shaft motion envelope by first decoupling and then coupling.

[0071] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for generating a drive shaft envelope, characterized in that: The method comprises: Obtain the parameters corresponding to the vehicle to be verified under various typical working conditions; Under the action of the parameters corresponding to the various typical working conditions, the relative position information between the drive shaft of the vehicle to be verified and related parts is obtained; the related parts are: a powertrain connected to the inner ball joint of the drive shaft of the vehicle to be verified and a tire connected to the outer ball joint of the drive shaft of the vehicle to be verified; The actual motion trajectory of the inner and outer ball joints of the drive shaft over time under the various typical working conditions is obtained through the relative position information between the drive shaft of the vehicle to be verified and related parts; Based on the actual motion trajectory, the central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions are obtained, and the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions are drawn in combination with the drive shaft model; Under the various typical working conditions, the motion envelope of the drive shaft model is obtained by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model; wherein the motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working conditions formed by the powertrain and wheel movement.

2. The method according to claim 1, characterized in that The various typical working conditions are obtained by combining the wheel motion law and the powertrain vibration law; The motion law of the wheel includes bouncing up and down with the suspension system, rotating with the steering system, and the superposition of the two motions; The vibration law of the powertrain includes: the rotation of the powertrain around the powertrain mass center, the rotation is decomposed into rotation around the X-axis, Y-axis, and Z-axis, and includes the movement of the powertrain mass center in the X-axis, Y-axis, and Z-axis directions.

3. The method according to claim 1 or 2, characterized in that The various typical operating conditions represent the actual movement conditions of the drive shaft, including: full throttle 0-100 acceleration conditions, maximum braking force 100-0 braking conditions, full throttle reverse gear conditions, turning conditions, pothole and bump conditions, bump conditions, and superimposed conditions of the above conditions, including full throttle left turn conditions, full throttle right turn conditions, full throttle pothole and bump conditions, and full throttle bump conditions.

4. The method according to claim 1, characterized in that The parameters corresponding to the vehicle under various typical working conditions to be verified include driving parameters and road parameters under various typical working conditions; wherein, the driving parameters and road parameters under different working conditions are different.

5. The method according to claim 1, characterized in that The step of obtaining relative position information between the drive shaft of the vehicle to be verified and related components under the corresponding parameters under the various typical working conditions specifically includes: Selecting rigid positioning points on the vehicle body-in-white, the wheels, and the powertrain; Based on the rigid positioning points, measuring the motion parameters of the wheels and the powertrain relative to the vehicle body-in-white during driving of the vehicle, wherein the motion parameters are coordinate information that changes with time; Based on the spatial position relationship between the powertrain and the inner ball joint, and between the wheel and the outer ball joint, the relative position information of the inner and outer ball joints of the drive shaft relative to the automobile body-in-white that changes with time is obtained.

6. The method according to claim 5, characterized in that The step of measuring the motion parameters of the wheels and the powertrain relative to the vehicle body-in-white during driving of the vehicle based on the rigid positioning points specifically includes: Obtaining absolute coordinate information of rigid positioning points on the automobile body-in-white, the wheels, and the powertrain; When the automobile body-in-white is absolutely stationary, the movement of the wheels and the powertrain relative to the automobile body-in-white is combined with the absolute coordinate information of the rigid positioning points on the automobile body-in-white, the wheels, and the powertrain to calculate the relative coordinate information of the rigid positioning points on the wheels and the powertrain relative to the rigid positioning points on the automobile body-in-white.

7. The method according to claim 5, characterized in that The spatial position relationship between the power assembly and the inner ball joint is based on the relatively static motion relationship between the power assembly and the inner ball joint, and the center coordinates of the inner ball joint are calculated from the relative coordinate information coordinates of the rigid positioning point on the power assembly.

8. The method according to claim 5, characterized in that The spatial position relationship between the wheel and the outer ball joint is based on the relatively static motion relationship between the wheel and the outer ball joint, and the center coordinates of the outer ball joint are calculated from the relative coordinate information of the rigid positioning point on the wheel.

9. The method according to claim 1, characterized in that The drive shaft model has different motion envelopes under different typical working conditions.

10. A system for generating a drive shaft envelope, characterized in that: include: The first acquisition unit is used to acquire the parameters corresponding to the vehicle to be verified under various typical working conditions; A second acquisition unit is used to acquire relative position information between the drive shaft of the vehicle to be verified and related parts under the action of the parameters corresponding to the various typical working conditions; the related parts are: a powertrain connected to the inner ball joint of the drive shaft of the vehicle to be verified and a tire connected to the outer ball joint of the drive shaft of the vehicle to be verified; A third acquisition unit is used to acquire the actual motion trajectory of the inner and outer ball joints of the drive shaft following time under the various typical working conditions through the relative position information between the drive shaft of the vehicle to be verified and related parts; A drawing unit, for obtaining the time-varying central coordinates of the inner and outer ball joints of the drive shaft under the various typical working conditions based on the actual motion trajectory, and drawing the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions in combination with the drive shaft model; The envelope generation unit is used to obtain the motion envelope of the drive shaft model by superimposing the motion envelopes of the inner and outer ball joints of the drive shaft model under the various typical working conditions; wherein the motion envelope of the drive shaft model is used to characterize the motion envelope of the drive shaft under the coupled working condition formed by the powertrain and wheel movement.

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