Design method, device, equipment and medium for automobile range extender suspension system

Abstract

The present application provides a design method, device, equipment and medium for a suspension system of an automobile range extender, wherein the method includes: establishing an automobile space coordinate system according to the automobile X-axis, Y-axis and Z-axis; obtaining the coordinates of the elastic center of the first suspension structure and the elastic center of the second suspension structure in the automobile space coordinate system, and obtaining a first connecting line according to the two coordinates; calculating the distance between the projections to the plane formed by the automobile X-axis and the automobile Y-axis according to the center of mass of the range extender and the first connecting line, and obtaining the first distance; then calculating the auxiliary distance according to the moment of inertia of the range extender around the automobile Y-axis, the mass of the range extender and the first distance; calculating the coordinates of the elastic center of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates. Through the above-mentioned design method, the center of mass of the range extender can be allowed to deviate from the first connecting line; the range extender and the suspension system can adapt to models with smaller cabin space, make rational use of the space in the cabin, and improve space utilization.

Description

Technical Field

[0001] The present disclosure generally relates to the field of automobile suspension, and in particular to a design method, device, equipment and medium for an automobile range extender suspension system. Background Art

[0002] The range extender mount of a car not only fixes the powertrain but also isolates the vibration of the powertrain. The quietness of modern cars is increasingly valued, and the mount system has important value. The layout of the mount system is the most important part of the mount vibration isolation.

[0003] At present, all vehicles on the market are equipped with a three-point torque shaft suspension system, that is, the center of mass of the range extender assembly is arranged on the left and right suspension connection line, or as close as possible, and the spacing is generally not more than 5mm; the angle between the left and right suspension connection line and the torque shaft is as small as possible, generally not more than 5°. However, when arranging the actual vehicle, it is often difficult to achieve such an effect due to the limited location available for mounting the suspension.

[0004] With the rise of new energy vehicles, the actual layout of the range extender assembly often requires the range extender and the drive motor to share a small-sized cabin. The drive motor is often much smaller than the range extender, which poses a great challenge to the layout of the range extender. In this case, the layout of the range extender is required to make full use of all the space in the cabin.

[0005] However, the center of mass of the existing range extender must coincide with the connecting line of the left and right suspensions along the Z-axis direction of the vehicle; when designing a vehicle with a smaller cabin space, the location of the range extender in the cabin space will be restricted by the suspension position, making it difficult to coincide with the connecting line of the left and right suspensions along the Z-axis direction of the vehicle; the original three-point suspension arrangement has low space utilization and is difficult to adapt to the smaller cabin space of new energy vehicles. Summary of the invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a design method, device, equipment and medium for a suspension system of an automobile range extender.

[0007] In a first aspect, the present application provides a design method for a vehicle range extender suspension system, comprising:

[0008] In the vehicle space coordinate system, the elastic center coordinates of the first suspension structure are obtained to obtain the first coordinates; the elastic center coordinates of the second suspension structure are obtained to obtain the second coordinates; the vehicle space coordinate system is composed of the vehicle X-axis, the vehicle Y-axis and the vehicle Z-axis;

[0009] According to the first coordinate and the second coordinate, construct a connecting line between the elastic center of the first suspension structure and the elastic center of the second suspension structure, and project the connecting line onto a plane formed by the X-axis and the Y-axis of the vehicle to form a first connecting line;

[0010] In the vehicle space coordinates, the initial coordinates of the center of mass of the range extender are obtained, and based on the initial coordinates, the first projection coordinates of the center of mass of the range extender projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis are obtained;

[0011] Calculate a first distance according to the first connecting line and the first projection coordinates, where the first distance is a vertical distance between the first projection coordinates and the first connecting line;

[0012] When it is determined that the first distance is greater than the first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance; the auxiliary distance is used to assist in calculating the elastic center coordinates of the third suspension structure;

[0013] The elastic center coordinates of the third suspension structure are calculated according to the auxiliary distance, the first connecting line and the first projection coordinates; the elastic center coordinates of the third suspension structure are the coordinates projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis.

[0014] According to the technical solution provided in the embodiment of the present application, after calculating the elastic center coordinates of the third suspension structure, the method further includes:

[0015] The coordinates of the initial coordinates along the Z axis of the vehicle are used as the coordinates of the elastic center of the third suspension structure along the Z axis of the vehicle, and the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system are obtained.

[0016] According to the technical solution provided in the embodiment of the present application, after obtaining the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system, the method further includes:

[0017] According to the target coordinates, obtaining the third coordinates of the third suspension structure projected onto the plane formed by the X-axis and the Z-axis of the vehicle;

[0018] According to the first coordinate and the second coordinate, a fourth coordinate of an intersection point between a line connecting the first coordinate and the second coordinate and a plane formed by an X-axis and a Z-axis of the vehicle is calculated;

[0019] A third suspension structure installation direction perpendicular to a line connecting the third coordinate and the fourth coordinate is calculated according to the third coordinate and the fourth coordinate.

[0020] According to the technical solution provided in the embodiment of the present application, the step of calculating the third suspension structure installation direction perpendicular to the line connecting the third coordinate and the fourth coordinate according to the third coordinate and the fourth coordinate includes:

[0021] According to the third coordinate and the fourth coordinate, respectively calculate the coordinate difference of the third coordinate and the fourth coordinate along the X-axis direction of the vehicle and the coordinate difference along the Z-axis direction of the vehicle; obtain the X-axis coordinate difference and the Z-axis coordinate difference;

[0022] According to the X-axis coordinate difference and the Z-axis coordinate difference, the angle between the connecting line of the third coordinate and the fourth coordinate and the X-axis of the vehicle is calculated to obtain the installation angle;

[0023] The installation angle is used as the angle between the third suspension structure and the Z axis of the vehicle, and the fourth coordinate is used as the elastic center installation point of the third suspension structure to obtain the installation direction of the third suspension structure; the installation direction of the third suspension structure is in the plane formed by the X axis of the vehicle and the Z axis of the vehicle, and the installation direction of the third suspension structure is perpendicular to the line connecting the third coordinate and the fourth coordinate, and the angle between the third suspension structure and the Z axis of the vehicle is equal to the installation angle.

[0024] According to the technical solution provided in the embodiment of the present application, the steps of constructing a projection of a line between the elastic center of the first suspension structure and the elastic center of the second suspension structure on a plane formed by the X-axis and the Y-axis of the vehicle according to the first coordinate and the second coordinate, and forming the first line include:

[0025] According to the first coordinate, a fifth coordinate is obtained by projecting the first coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle;

[0026] According to the second coordinate, a sixth coordinate is obtained by projecting the second coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle;

[0027] The first connecting line is obtained by calculation according to the fifth coordinate and the sixth coordinate.

[0028] According to the technical solution provided in the embodiment of the present application, the step of calculating the auxiliary distance according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance includes:

[0029] A first ratio of the moment of inertia of the range extender around the Y axis of the vehicle to the product of the mass of the range extender and the first distance is calculated; and the auxiliary distance is equal to the first ratio.

[0030] According to the technical solution provided in the embodiment of the present application, the specific steps of calculating the elastic center coordinates of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates include:

[0031] Calculate, according to the first connecting line and the first projection coordinate, a first perpendicular line of the first connecting line passing through the first projection coordinate;

[0032] Two reference coordinates are calculated according to the first perpendicular line, the first projection coordinates and the auxiliary distance; the reference coordinates are collinear with the first perpendicular line and the distance between the reference coordinates and the first projection coordinates is equal to the auxiliary distance;

[0033] A reference coordinate on a side far from the first connecting line relative to the first projection coordinate is selected as the elastic center coordinate of the third suspension structure.

[0034] In a second aspect, the present application provides a design device for a vehicle range extender suspension system, comprising:

[0035] An acquisition module, wherein the acquisition module is configured to acquire the elastic center coordinates of the first suspension structure in a vehicle space coordinate system to obtain a first coordinate; and acquire the elastic center coordinates of the second suspension structure to obtain a second coordinate; the vehicle space coordinate system is composed of a vehicle X-axis, a vehicle Y-axis, and a vehicle Z-axis;

[0036] A processing module, the processing module being configured to: construct, based on the first coordinate and the second coordinate, a first connecting line formed by a projection of a connecting line between an elastic center of the first suspension structure and an elastic center of the second suspension structure on a plane formed by an X-axis and a Y-axis of the vehicle;

[0037] In the vehicle space coordinates, the initial coordinates of the center of mass of the range extender are obtained, and based on the initial coordinates, the first projection coordinates of the center of mass of the range extender to the plane formed by the vehicle X-axis and the vehicle Y-axis are obtained;

[0038] Calculate a first distance according to the first connecting line and the first projection coordinates, where the first distance is a vertical distance between the first projection coordinates and the first connecting line;

[0039] When it is determined that the first distance is greater than a first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance;

[0040] The elastic center coordinates of the third suspension structure are calculated according to the auxiliary distance, the first connecting line and the first projection coordinates; the elastic center coordinates of the third suspension structure are the coordinates projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis.

[0041] In a third aspect, the present application provides a computer device, including:

[0042] A memory, a processor, and a program for designing a suspension system for an automobile range extender stored in the memory; the program for designing a suspension system for an automobile range extender is configured to:

[0043] A method for designing a vehicle range extender suspension system according to any of the above embodiments is performed.

[0044] In a fourth aspect, the present application provides a storage medium, on which is stored a vehicle range extender suspension system design program; when the vehicle range extender suspension system design program is executed, it is used to:

[0045] A method for designing a vehicle range extender suspension system according to any of the above embodiments is performed.

[0046] The beneficial effects of this application are:

[0047] This application establishes a vehicle space coordinate system according to the vehicle X-axis, Y-axis and Z-axis; obtains the coordinates of the elastic center of the first suspension structure and the elastic center of the second suspension structure in the vehicle space coordinate system, and obtains the first connecting line according to the two coordinates; calculates the distance between the projections to the plane formed by the vehicle X-axis and the vehicle Y-axis according to the center of mass of the range extender and the first connecting line, and obtains the first distance; then calculates the auxiliary distance according to the moment of inertia of the range extender around the vehicle Y-axis, the mass of the range extender and the first distance; calculates the coordinates of the elastic center of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates. Through the above design method, the center of mass of the range extender can be allowed to deviate from the first connecting line; the range extender and the suspension system can adapt to models with smaller cabin space, make rational use of the space in the cabin, and improve space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0049] Figure 1 A schematic diagram of a flow chart of a design method for a vehicle range extender suspension system provided in this application;

[0050] Figure 2 This is a top view of the vehicle range extender and suspension system;

[0051] Figure 3 This is a top-down view of the vehicle range extender and suspension system;

[0052] Figure 4 This is a simplified side view of the vehicle range extender and suspension system;

[0053] Figure 5 This is a side view of the vehicle range extender and suspension system;

[0054] Among them: 1. range extender; 2. initial coordinates; 3. fifth coordinates; 4. sixth coordinates; 5. first connecting line; 6. elastic center coordinates of the third suspension structure; 7. first distance; 8. auxiliary distance; 9. third coordinates; 10. fourth coordinates; 11. installation direction of the third suspension structure; 12. connecting line between the third coordinates and the fourth coordinates; 13. first suspension structure; 14. second suspension structure; 15. installation angle; 16. third suspension structure. DETAILED DESCRIPTION

[0055] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] This application uses the X-axis, Y-axis and Z-axis of the car to describe the direction of the car. Specifically, the X-axis direction of the car refers to the direction in which the car normally moves, the Y-axis direction of the car refers to the direction parallel to the wheel rotation axis direction, and the Z-axis direction refers to the vertical direction.

[0058] Example 1

[0059] Please refer to Figure 1 , is a schematic diagram of a design method of a vehicle range extender suspension system provided in this embodiment; wherein the detailed steps include:

[0060] S1: in a vehicle space coordinate system, obtaining the elastic center coordinates of the first suspension structure to obtain a first coordinate; obtaining the elastic center coordinates of the second suspension structure to obtain a second coordinate; the vehicle space coordinate system is composed of a vehicle X-axis, a vehicle Y-axis and a vehicle Z-axis;

[0061] S2: constructing a connecting line between the elastic center of the first suspension structure and the elastic center of the second suspension structure according to the first coordinate and the second coordinate, and projecting the connecting line onto a plane formed by the X-axis and the Y-axis of the vehicle to form a first connecting line;

[0062] S3: Under the vehicle space coordinates, the initial coordinate 2 of the center of mass of the range extender 1 is obtained, and based on the initial coordinate 2, the first projection coordinate of the center of mass of the range extender 1 projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis is obtained;

[0063] S4: Calculate a first distance according to the first connecting line 5 and the first projection coordinates, where the first distance 7 is a vertical distance between the first projection coordinates and the first connecting line;

[0064] S5: When it is determined that the first distance 7 is greater than the first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender 1 around the Y axis of the vehicle, the mass of the range extender and the first distance 7; the auxiliary distance is used to assist in calculating the elastic center coordinates of the third suspension structure;

[0065] S6: Calculate the elastic center coordinates of the third suspension structure according to the auxiliary distance 8, the first connecting line and the first projection coordinates; the elastic center coordinates 6 of the third suspension structure 16 are the coordinates projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis.

[0066] Specifically, when describing the direction of a car, the car's X-axis, Y-axis, and Z-axis are usually used. The X-axis direction of the car refers to the direction in which the car normally moves, the Y-axis direction of the car refers to the direction parallel to the wheel rotation axis direction, and the Z-axis direction refers to the vertical direction.

[0067] In the process of installing the range extender into the cabin space, in order to keep the range extender 1 balanced and stable in the cabin space, it is generally necessary to make the center of mass of the range extender 1 coincide with the first connecting line along the Z-axis direction of the vehicle. When the center of mass of the range extender 1 coincides with the first connecting line along the Z-axis direction of the vehicle, the range extender 1 can maintain balance and will not cause motion interference with other components.

[0068] Since the cabin space of current new energy vehicles is smaller than that of conventional vehicles, and since the suspension installation position in the cabin space is relatively fixed and difficult to adjust, it is necessary to adjust the installation position of the range extender in the process of designing the suspension system of the new energy vehicle range extender.

[0069] According to the above situation, after adjusting the position of the range extender, the center of mass position of the range extender no longer coincides with the first connecting line along the Z-axis direction of the vehicle. In order to ensure that the range extender remains balanced and stable, an additional third suspension structure is required to balance the force of the range extender.

[0070] This application uses the car's X-axis, Y-axis, and Z-axis to establish the car's space coordinate system;

[0071] The first connecting line is calculated according to the first coordinates of the first suspension structure and the second coordinates of the second suspension structure; and the first distance is calculated according to the first projection coordinates of the first connecting line and the center of mass on the plane formed by the X-axis and the Y-axis of the vehicle; the first distance is the straight-line distance between the center of mass and the first connecting line on the plane formed by the X-axis and the Y-axis of the vehicle. The purpose of calculating the first distance is to measure whether the center of mass of the range extender deviates from the first connecting line by more than 5mm of the first preset distance according to the calculation result; when it is judged to be more than 5mm, it indicates that the third suspension structure 16 needs to be added, and then the calculation of the elastic center coordinate 6 of the third suspension structure is continued; otherwise, the third suspension structure 16 does not need to be added, and then the elastic center coordinate 6 of the third suspension structure does not need to be calculated.

[0072] When it is determined that the first distance exceeds 5 mm, the auxiliary distance is calculated according to the first distance 7, the moment of inertia of the range extender around the Y-axis of the vehicle and the mass of the range extender; the elastic center coordinates of the third suspension structure are finally calculated according to the auxiliary distance 8, the first connecting line and the first projection coordinates.

[0073] The auxiliary distance is equal to the moment of inertia of the range extender 1 around the Y axis of the vehicle divided by the product of the first mass and the first distance. The auxiliary distance calculated is the distance from the first projection coordinate to the position point on the side away from the first connecting line.

[0074] Specifically, in the physical process of preventing an object from rotating, when the center of mass of the object is between the rotation axis and the support point, the support point is in a smaller load-bearing range. This application utilizes such physical principles; wherein the elastic center coordinate 6 of the third suspension structure is equivalent to the support point, the first connecting line is equivalent to the rotation axis, and the first projection coordinate is equivalent to the center of mass of the rotating object; the center of mass of the range extender is between the first connecting line and the elastic center coordinate 6 of the third suspension structure, and therefore is in the range with the smallest load.

[0075] Specifically, the third suspension structure is arranged at the elastic center coordinate 6 of the third suspension structure 16 , and the elastic center of the third suspension structure is arranged at the elastic center coordinate 6 of the third suspension structure 16 .

[0076] The suspension structure design method provided in the present application aims to calculate the position coordinates of the minimum load-bearing point based on the coordinates of the center of mass of the range extender and the elastic center points of the first suspension structure and the second suspension structure, in combination with the mass of the range extender and the moment of inertia of the range extender along the Y-axis of the vehicle; and add a third suspension structure at the minimum load-bearing point, so that after the third suspension structure is installed, the center of mass of the range extender can remain balanced and stable when it deviates from the second connecting line.

[0077] Through the above method, the third suspension structure can support the range extender 1 at the minimum load-bearing point (the elastic center coordinate of the third suspension structure), maintain the balance and stability of the range extender when the center of mass of the range extender deviates from the first connecting line; it can also improve the load-bearing effect of the third suspension structure.

[0078] In some embodiments, the third suspended structure includes:

[0079] A first connecting end, wherein the first connecting end is fixedly mounted on the frame;

[0080] A suspension load-bearing part, one end of which is fixedly connected to the first connection end, and the suspension load-bearing part has a third elastic force center point; the suspension load-bearing part is arranged along the installation direction 11 of the third suspension structure 16, and is used to support the range extender 1 along the installation direction 11 of the third suspension structure 16;

[0081] The second connecting end has a limiting protrusion, the position of the limiting protrusion corresponds to the third elastic center point of the suspension load-bearing part, and is used to limit the relative position of the suspension load-bearing part and the range extender 1.

[0082] Specifically, when the range extender shakes, the suspension load-bearing part of the third suspension structure 16 will expand and contract along the installation direction of the third suspension structure under the action of pressure, which can reduce the shaking of the range extender and ensure the stability of the suspension system.

[0083] In some embodiments, the suspension load-bearing part is made of rubber material. By utilizing the good elasticity of the rubber material, the stability of the third suspension structure can be further improved, thereby improving the stability of the range extender.

[0084] Specifically, when the first distance 7 is not greater than the first preset distance, the conventional method is used to arrange the suspension system; the first preset distance is 5 mm.

[0085] Among them, the conventional suspension arrangement method is:

[0086] The range extender is suspended into the cabin space using the suspension assembly;

[0087] A first suspension structure is fixedly installed at a first coordinate, and a second suspension structure is fixedly installed at a second coordinate;

[0088] Remove the suspension components.

[0089] Specifically, when the first distance 7 is not greater than the first preset distance, the conventional method is used to arrange the suspension system; the use of a suspension structure can be reduced, unnecessary structures can be reduced, and the weight of the vehicle body can be reduced; parts consumption can be reduced, and production costs can be reduced.

[0090] Furthermore, after calculating the elastic center coordinates of the third suspension structure, the method further includes:

[0091] The coordinates of the initial coordinates 2 along the Z axis of the vehicle are used as the coordinates of the elastic center coordinates 6 of the third suspension structure along the Z axis of the vehicle to obtain the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system.

[0092] In some embodiments, the coordinate of the initial coordinate 2 along the Z-axis of the vehicle is used as the coordinate of the elastic center coordinate 6 of the third suspension structure along the Z-axis of the vehicle; the third suspension structure and the center of mass of the range extender are made to be at the same height; the center of mass and the third suspension structure can be maintained on the same horizontal plane; when the range extender starts to shake after being started, the design method of making the third suspension structure and the center of mass of the range extender at the same height can make the range extender have a smaller shaking amplitude along the Y-axis direction of the vehicle, further improving the structural stability of the range extender and the suspension system.

[0093] In some embodiments, the elastic center coordinate 6 of the third suspension structure can be adjusted according to the actual vehicle model; so that the height difference between the coordinate of the elastic center coordinate 6 of the third suspension structure along the Z axis of the vehicle and the coordinate of the initial coordinate 2 along the Z axis of the vehicle is not greater than 15mm. The above adjustment method enables the third suspension structure to be fine-tuned within a range of 15mm according to different cabin structures; while ensuring the balance and stability of the range extender, the applicable scope of the third suspension structure is increased.

[0094] Furthermore, after obtaining the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system, the method further includes:

[0095] According to the target coordinates, obtaining the third coordinates of the third suspension structure projected onto the plane formed by the X-axis and the Z-axis of the vehicle;

[0096] According to the first coordinate and the second coordinate, a fourth coordinate of an intersection point between a line connecting the first coordinate and the second coordinate and a plane formed by an X-axis and a Z-axis of the vehicle is calculated;

[0097] According to the third coordinate 9 and the fourth coordinate, a third suspension structure installation direction perpendicular to the line connecting the third coordinate 9 and the fourth coordinate is calculated.

[0098] In some embodiments, by projecting the first coordinate of the first suspension structure and the second coordinate of the second suspension structure onto the plane formed by the X-axis and the Z-axis of the vehicle, the coordinate difference of the initial coordinate 2 along the X-axis direction of the vehicle can be conveniently calculated, thereby obtaining the first distance; the measurement error can also be reduced, and the situation that the centroid of the range extender coincides with the first connecting line along the Z-axis direction of the vehicle and the actual distance is greater than the first preset distance is avoided, and it is determined that the third suspension structure needs to be added. In the above manner, calculation errors can be reduced.

[0099] Specifically, when the actual installation direction of the third suspension structure is not perpendicular to the third suspension structure installation direction 11, a lateral force perpendicular to the actual installation direction will appear during the range extender shaking process. Since the load-bearing effect of the suspension structure perpendicular to the installation direction is poor, when encountering such a situation, it is easy to cause the position of the range extender to shift and the shaking amplitude to increase; in severe cases, the suspension structure may break and the range extender may fall and be damaged.

[0100] In some embodiments, after obtaining the target coordinates of the elastic center of the third suspension structure in the automobile space coordinate system, the installation direction of the third suspension structure is calculated; and in the process of installing the third suspension structure, the third suspension structure is oriented toward the third suspension structure installation direction 11; the force-bearing direction of the third suspension structure can be made perpendicular to the radius of the range extender's shaking, thereby avoiding the third suspension structure from generating a force perpendicular to the third suspension structure installation direction 11, thereby improving the force-bearing effect of the third suspension structure and improving the stability of the range extender and the suspension system.

[0101] Further, according to the third coordinate 9 and the fourth coordinate 10, the step of calculating the third suspension structure installation direction perpendicular to the line connecting the third coordinate 9 and the fourth coordinate 10 includes:

[0102] According to the third coordinate 9 and the fourth coordinate 10, respectively calculate the coordinate difference of the third coordinate 9 and the fourth coordinate 10 along the X-axis direction of the vehicle and the coordinate difference along the Z-axis direction of the vehicle; obtain the X-axis coordinate difference and the Z-axis coordinate difference;

[0103] According to the X-axis coordinate difference and the Z-axis coordinate difference, the angle between the line connecting the third coordinate 9 and the fourth coordinate 10 and the X-axis of the vehicle is calculated to obtain the installation angle;

[0104] The installation angle 15 is used as the angle between the third suspension structure and the Z axis of the vehicle, and the fourth coordinate 10 is used as the elastic center installation point of the third suspension structure to obtain the installation direction of the third suspension structure; the third suspension structure installation direction 11 is in the plane formed by the X axis of the vehicle and the Z axis of the vehicle, and the third suspension structure installation direction 11 is perpendicular to the line 12 between the third coordinate and the fourth coordinate, and the angle between the third suspension structure and the Z axis of the vehicle is equal to the installation angle 15.

[0105] In some embodiments, in the process of calculating the installation angle by using the X-axis coordinate difference and the Z-axis coordinate difference, it is calculated by formula (1);

[0106]

[0107] Wherein, θ represents the installation angle, ΔX represents the X-axis coordinate difference, and ΔZ represents the Z-axis coordinate difference.

[0108] Specifically, refer to Figure 4 and Figure 5 Since the third suspension structure installation direction 11 is perpendicular to the line 12 connecting the third coordinate and the fourth coordinate, the installation angle calculated by the difference between the coordinates in the above process is equal to the angle between the third suspension structure installation direction and the Z-axis direction of the vehicle.

[0109] Among them, Figure 4 As shown, the line 12 connecting the third coordinate and the fourth coordinate, the Z axis of the car and the X axis of the car form a first triangle; the line 12 connecting the third coordinate and the fourth coordinate, the Z axis of the car and the third suspension structure installation direction 11 form a second triangle. The first triangle and the second triangle have two overlapping sides that are not perpendicular to each other and also include a right-angled internal angle; therefore, the first triangle and the second triangle have two equal internal angles; since the sum of the internal angles of the triangles is 180 degrees, it can be deduced that the three internal angles of the two triangles are equal; therefore, it can be deduced that the two triangles are geometrically similar; further, it can be deduced that:

[0110] The angle between the third suspension structure installation direction 11 and the Z axis of the vehicle is equal to the installation angle 15 .

[0111] Further, based on the first coordinate and the second coordinate, a projection of a line between the elastic center of the first suspension structure and the elastic center of the second suspension structure on a plane formed by the X-axis and the Y-axis of the vehicle is constructed, and the step of forming a first line includes:

[0112] According to the first coordinate, a fifth coordinate is obtained by projecting the first coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle;

[0113] According to the second coordinate, a sixth coordinate is obtained by projecting the second coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle;

[0114] The first connecting line 5 is calculated according to the fifth coordinate 3 and the sixth coordinate 4 .

[0115] Specifically, the fifth coordinate 3 is the component of the first coordinate along the vehicle X-axis and the vehicle Y-axis; the sixth coordinate 4 is the component of the second coordinate along the vehicle X-axis and the vehicle Y-axis.

[0116] Since the fifth coordinate and the sixth coordinate both have components of the vehicle's X-axis and the vehicle's Y-axis, the slope of the first connecting line 5 in the plane formed by the vehicle's X-axis and the vehicle's Y-axis can be calculated using the coordinate difference, and then the fifth coordinate or the sixth coordinate and the slope are substituted into the plane straight line formula to calculate the analytical expression of the first connecting line in the plane formed by the vehicle's X-axis and the vehicle's Y-axis.

[0117] Further, refer to Figure 2 and Figure 3, the step of calculating the auxiliary distance according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance comprises:

[0118] A first ratio of the moment of inertia of the range extender 1 around the Y axis of the vehicle to the product of the mass of the range extender and the first distance 7 is calculated; and the auxiliary distance 8 is equal to the first ratio.

[0119] In some embodiments, the auxiliary distance 8 is calculated according to formula (ii);

[0120]

[0121] Among them, L 2 represents the auxiliary distance, L 1 represents the first distance, M represents the first mass, J yy Represents the range extender's moment of inertia around the vehicle's Y axis.

[0122] In some embodiments, the moment of inertia of the range extender 1 around the Y-axis of the vehicle is measured based on a moment of inertia experiment.

[0123] Specifically, due to the connection relationship between the range extender and the suspension structure, the line connecting the first suspension structure and the second suspension structure is the rotation axis when the range extender shakes; since there is a small angle (no more than 5 degrees) between the line connecting the first suspension structure and the second suspension structure and the Y-axis of the vehicle, they can be approximately considered to be parallel to each other; therefore, it is necessary to measure the moment of inertia of the range extender around the Y-axis of the vehicle.

[0124] Furthermore, the specific steps of calculating the elastic center coordinates of the third suspension structure according to the auxiliary distance 8, the first connecting line and the first projection coordinates include:

[0125] Calculate, according to the first connecting line 5 and the first projection coordinate, a first perpendicular line of the first connecting line 5 passing through the first projection coordinate;

[0126] According to the first vertical line, the first projection coordinate and the auxiliary distance 8, two reference coordinates are calculated; the reference coordinate is collinear with the first vertical line and the distance between the reference coordinate and the first projection coordinate is equal to the auxiliary distance;

[0127] A reference coordinate on a side far from the first connecting line 5 relative to the first projection coordinate is selected as the elastic center coordinate of the third suspension structure.

[0128] Specifically, after calculating the third suspension structure installation direction 11,

[0129] Measuring and obtaining the stiffness of the first suspension structure and the stiffness of the second suspension structure;

[0130] According to the first distance 7 and the auxiliary distance, the stiffness of the third suspension structure is calculated in combination with formula (III);

[0131] Formula (III) is specifically expressed as:

[0132]

[0133] Among them, D 3 Denotes the stiffness of the third mount, D 2 represents the stiffness of the second suspension structure, D 1 represents the stiffness of the first suspension structure, L 1 represents the first distance, L 2 represents the auxiliary distance.

[0134] Specifically, the stiffness is calculated according to formula (IV);

[0135]

[0136] Among them, k represents stiffness, P represents the applied force, and δ represents the deformation, that is, the difference between the length before deformation and the length after deformation.

[0137] Specifically, the installation method of the range extender and the first suspension structure, the second suspension structure and the third suspension structure includes:

[0138] Suspending the range extender into the cabin space by using a suspension assembly so that the center of mass of the range extender is at the initial center of mass position;

[0139] Install the first suspension structure to the first coordinate so that the first suspension structure 13 is fixedly connected to the frame assembly and the first end;

[0140] Install the second suspension structure to the second coordinate, so that the second suspension structure 14 is fixedly connected to the frame assembly and the second end;

[0141] Setting the third suspension structure to the target coordinates;

[0142] Adjusting the direction of the third suspension structure so that the third suspension structure is arranged along the third suspension structure installation direction;

[0143] Fixedly connecting the third suspension and the third end, and fixedly connecting the third suspension and the frame assembly;

[0144] Remove the suspension assembly.

[0145] Specifically, after the range extender is installed on the frame assembly, a force test is performed; the force test specifically includes:

[0146] measuring the pressure exerted on the third suspension to obtain a first pressure value;

[0147] Determine: when the first pressure value is greater than the stiffness of the third suspension, increase the stiffness of the third suspension;

[0148] When the first pressure value is less than the stiffness of the third suspension, reducing the stiffness of the third suspension; wherein the stiffness is adjusted by 3% to 5% each time;

[0149] comparing the first pressure value with the product of the stiffness and deformation of the third suspension;

[0150] The test is stopped when the ratio is within the range of 95%-100%; the stiffness finally obtained is taken as the stiffness of the third suspension structure.

[0151] In some embodiments, an auxiliary suspension structure is also fixedly connected between the range extender and the frame assembly; the auxiliary suspension structure is arranged on a side of the range extender connected to the third suspension; one end of the auxiliary suspension structure is connected to the frame assembly, and the other end is connected to the range extender.

[0152] In some embodiments, the auxiliary suspension structure specifically includes: a third connecting end, a second load-bearing portion, and a fourth connecting end.

[0153] The third connecting end is fixedly mounted on the frame;

[0154] One end of the second load-bearing part is fixedly connected to the third connecting end, and the second load-bearing part has a fourth elastic force center point; the second load-bearing part is arranged along the installation direction of the third suspension structure; the length of the second load-bearing part along the installation direction of the third suspension structure is less than the length of the suspension load-bearing part along the installation direction of the third suspension structure; and it is used to limit the range extender along the installation direction of the third suspension structure when the range extender shakes too much.

[0155] The second connecting end is provided with a limit rod, and the end of the limit rod away from the second load-bearing part is provided with a limit part; the limit rod is installed in the sliding space of the range extender and can slide relative to the range extender; the position of the limit rod corresponds to the fourth elastic center point of the second load-bearing part; the limit part is perpendicular to the limit rod. When the range extender shakes more than the length of the limit rod, the limit part abuts against the range extender to limit.

[0156] Example 2

[0157] This embodiment provides a design device for a vehicle range extender suspension system, including:

[0158] An acquisition module, wherein the acquisition module is configured to acquire the elastic center coordinates of the first suspension structure in a vehicle space coordinate system to obtain a first coordinate; and acquire the elastic center coordinates of the second suspension structure to obtain a second coordinate; the vehicle space coordinate system is composed of a vehicle X-axis, a vehicle Y-axis, and a vehicle Z-axis;

[0159] A processing module, the processing module being configured to: construct, based on the first coordinate and the second coordinate, a first connecting line formed by a projection of a connecting line between an elastic center of the first suspension structure and an elastic center of the second suspension structure on a plane formed by an X-axis and a Y-axis of the vehicle;

[0160] In the vehicle space coordinates, the initial coordinates of the center of mass of the range extender are obtained, and based on the initial coordinates, the first projection coordinates of the center of mass of the range extender to the plane formed by the vehicle X-axis and the vehicle Y-axis are obtained;

[0161] Calculate a first distance according to the first connecting line and the first projection coordinates, where the first distance is a vertical distance between the first projection coordinates and the first connecting line;

[0162] When it is determined that the first distance is greater than a first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance;

[0163] The elastic center coordinates of the third suspension structure are calculated according to the auxiliary distance, the first connecting line and the first projection coordinates; the elastic center coordinates of the third suspension structure are the coordinates projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis.

[0164] Specifically, the design device of the automobile range extender suspension system provided in the present application specifically includes: a collection module, wherein the collection module is configured to:

[0165] Use the car's X-axis, Y-axis, and Z-axis to establish the car's space coordinate system;

[0166] Calculate a first connecting line according to the first coordinates of the first suspension structure and the second coordinates of the second suspension structure; and calculate a first distance according to the first projection coordinates of the first connecting line and the center of mass on the plane formed by the X-axis and the Y-axis of the vehicle;

[0167] Then, an auxiliary distance is calculated according to the first distance, the moment of inertia of the range extender around the Y-axis of the vehicle, and the mass of the range extender; and the elastic center coordinates of the third suspension structure are finally calculated according to the auxiliary distance, the first connecting line, and the first projection coordinates.

[0168] Specifically, the third suspension structure is arranged at the elastic center coordinates of the third suspension structure, and the elastic center of the third suspension structure is arranged at the elastic center coordinates of the third suspension structure.

[0169] The suspension structure design device provided in the present application can calculate the position coordinates of the minimum load-bearing point based on the coordinates of the center of mass of the range extender and the elastic center points of the first suspension structure and the second suspension structure, and in combination with the mass of the range extender and the moment of inertia of the range extender along the Y-axis of the vehicle; and add a third suspension structure at the minimum load-bearing point, so that after the third suspension structure is installed, the center of mass of the range extender can remain balanced and stable when it deviates from the second connecting line.

[0170] Through the above method, the third suspension structure can support the range extender at the minimum load-bearing point (the elastic center coordinate of the third suspension structure), maintain the balance and stability of the range extender when the center of mass of the range extender deviates from the first connecting line; it can also improve the load-bearing effect of the third suspension structure.

[0171] Example 3

[0172] This embodiment provides a computer device, including:

[0173] A memory, a processor, and a program for designing a suspension system for an automobile range extender stored in the memory; the program for designing a suspension system for an automobile range extender is configured to:

[0174] A method for designing a vehicle range extender suspension system according to any of the above embodiments is performed.

[0175] Specifically, a computer device includes a central processing unit (CPU), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage portion into a random access memory (RAM). In the RAM, various programs and data required for system operation are also stored. The CPU, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0176] The following components are connected to the I / O interface: an input section including a keyboard, a mouse, etc.; an output section including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section including a hard disk, etc.; and a communication section including a network interface card such as a LAN card, a modem, etc. The communication section performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that a computer program read therefrom is installed into the storage section as needed.

[0177] Example 4

[0178] This embodiment provides a storage medium, including:

[0179] The storage medium stores a vehicle range extender suspension system design program; when the vehicle range extender suspension system design program is executed, it is used to:

[0180] A method for designing a vehicle range extender suspension system according to any of the above embodiments is performed.

[0181] Specifically, the present application also provides a storage medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The storage medium carries one or more programs, and when the one or more programs are executed by an electronic device, the electronic device implements the method in the above embodiment, specifically the design method of the automotive range extender suspension system described in any of the above embodiments.

[0182] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A design method for a vehicle range extender suspension system, characterized in that: Used to install and arrange the range extender in the cabin space of the frame assembly, including: In the automobile space coordinate system, the elastic center coordinates of the first suspension structure are obtained to obtain the first coordinates; the elastic center coordinates of the second suspension structure are obtained to obtain the second coordinates; The vehicle space coordinate system is composed of a vehicle X-axis, a vehicle Y-axis and a vehicle Z-axis; According to the first coordinate and the second coordinate, construct a connecting line between the elastic center of the first suspension structure and the elastic center of the second suspension structure, and project the connecting line onto a plane formed by the X-axis and the Y-axis of the vehicle to form a first connecting line; In the vehicle space coordinates, the initial coordinates of the center of mass of the range extender are obtained, and based on the initial coordinates, the first projection coordinates of the center of mass of the range extender projected onto the plane formed by the vehicle X-axis and the vehicle Y-axis are obtained; Calculate a first distance according to the first connecting line and the first projection coordinates, where the first distance is a vertical distance between the first projection coordinates and the first connecting line; When it is determined that the first distance is greater than the first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance; the auxiliary distance is used to assist in calculating the elastic center coordinates of the third suspension structure; Calculating the elastic center coordinates of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates; The elastic center coordinates of the third suspension structure are the coordinates projected onto the plane formed by the X-axis and the Y-axis of the vehicle.

2. The design method of a vehicle range extender suspension system according to claim 1, characterized in that: After calculating the elastic center coordinates of the third suspension structure, the method further includes: The coordinates of the initial coordinates along the Z axis of the vehicle are used as the coordinates of the elastic center of the third suspension structure along the Z axis of the vehicle, and the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system are obtained.

3. The design method of a vehicle range extender suspension system according to claim 2, characterized in that: After obtaining the target coordinates of the elastic center of the third suspension structure in the vehicle space coordinate system, the method further includes: According to the target coordinates, obtaining the third coordinates of the third suspension structure projected onto the plane formed by the X-axis and the Z-axis of the vehicle; According to the first coordinate and the second coordinate, a fourth coordinate of an intersection point between a line connecting the first coordinate and the second coordinate and a plane formed by an X-axis and a Z-axis of the vehicle is calculated; A third suspension structure installation direction perpendicular to a line connecting the third coordinate and the fourth coordinate is calculated according to the third coordinate and the fourth coordinate.

4. The design method of a vehicle range extender suspension system according to claim 3, characterized in that: The step of calculating, according to the third coordinate and the fourth coordinate, a third suspension structure installation direction perpendicular to a line connecting the third coordinate and the fourth coordinate comprises: According to the third coordinate and the fourth coordinate, respectively calculate the coordinate difference of the third coordinate and the fourth coordinate along the X-axis direction of the vehicle and the coordinate difference along the Z-axis direction of the vehicle; obtain the X-axis coordinate difference and the Z-axis coordinate difference; According to the X-axis coordinate difference and the Z-axis coordinate difference, the angle between the connecting line of the third coordinate and the fourth coordinate and the X-axis of the vehicle is calculated to obtain the installation angle; The installation angle is used as the angle between the third suspension structure and the Z axis of the vehicle, and the fourth coordinate is used as the elastic center installation point of the third suspension structure to obtain the installation direction of the third suspension structure; the installation direction of the third suspension structure is in the plane formed by the X axis of the vehicle and the Z axis of the vehicle, and the installation direction of the third suspension structure is perpendicular to the line connecting the third coordinate and the fourth coordinate, and the angle between the third suspension structure and the Z axis of the vehicle is equal to the installation angle.

5. The design method of a vehicle range extender suspension system according to claim 1, characterized in that: According to the first coordinate and the second coordinate, a projection of a line between the elastic center of the first suspension structure and the elastic center of the second suspension structure on a plane formed by the X-axis and the Y-axis of the vehicle is constructed, wherein the step of forming the first line comprises: According to the first coordinate, a fifth coordinate is obtained by projecting the first coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle; According to the second coordinate, a sixth coordinate is obtained by projecting the second coordinate onto a plane formed by an X-axis and a Y-axis of the vehicle; The first connecting line is obtained by calculation according to the fifth coordinate and the sixth coordinate.

6. The design method of a vehicle range extender suspension system according to claim 1, characterized in that: The step of calculating the auxiliary distance according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance comprises: A first ratio of the moment of inertia of the range extender around the Y axis of the vehicle to the product of the mass of the range extender and the first distance is calculated; and the auxiliary distance is equal to the first ratio.

7. The design method of a vehicle range extender suspension system according to claim 1, characterized in that: The specific steps of calculating the elastic center coordinates of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates include: Calculate, according to the first connecting line and the first projection coordinate, a first perpendicular line of the first connecting line passing through the first projection coordinate; Two reference coordinates are calculated according to the first perpendicular line, the first projection coordinates and the auxiliary distance; the reference coordinates are collinear with the first perpendicular line and the distance between the reference coordinates and the first projection coordinates is equal to the auxiliary distance; A reference coordinate on a side far from the first connecting line relative to the first projection coordinate is selected as the elastic center coordinate of the third suspension structure.

8. A design device for a vehicle range extender suspension system, characterized in that: include: A collection module, wherein the collection module is configured to obtain the elastic center coordinates of the first suspension structure in the automobile space coordinate system to obtain a first coordinate; Acquire the elastic center coordinates of the second suspension structure to obtain the second coordinates; the vehicle space coordinate system is composed of the vehicle X-axis, the vehicle Y-axis and the vehicle Z-axis; A processing module, the processing module being configured to: construct, based on the first coordinate and the second coordinate, a first connecting line formed by projecting a connecting line between an elastic center of the first suspension structure and an elastic center of the second suspension structure onto a plane formed by an X-axis and a Y-axis of the vehicle; In the vehicle space coordinates, the initial coordinates of the center of mass of the range extender are obtained, and based on the initial coordinates, the first projection coordinates of the center of mass of the range extender to the plane formed by the vehicle X-axis and the vehicle Y-axis are obtained; Calculate a first distance according to the first connecting line and the first projection coordinates, where the first distance is a vertical distance between the first projection coordinates and the first connecting line; When it is determined that the first distance is greater than a first preset distance, an auxiliary distance is calculated according to the moment of inertia of the range extender around the Y axis of the vehicle, the mass of the range extender and the first distance; Calculating the elastic center coordinates of the third suspension structure according to the auxiliary distance, the first connecting line and the first projection coordinates; The elastic center coordinates of the third suspension structure are the coordinates projected onto the plane formed by the X-axis and the Y-axis of the vehicle.

9. A computer device, characterized in that: include: A memory, a processor, and a program for designing a suspension system for an automobile range extender stored in the memory; the program for designing a suspension system for an automobile range extender is configured to: A method for designing a vehicle range extender suspension system as described in any one of claims 1 to 7 is performed.

10. A storage medium, characterized in that: The storage medium stores a vehicle range extender suspension system design program; when the vehicle range extender suspension system design program is executed, it is used to: A method for designing a vehicle range extender suspension system as described in any one of claims 1 to 7 is performed.

Images