A design verification method for vehicle swing value

Abstract

The present invention provides a design verification method for a vehicle's swing value, comprising the following steps: step S1, obtaining vehicle design data; step S2, using the design data to establish a vehicle model in drawing software; step S3, using the vehicle model to measure the vehicle's swing value; step S4, determining whether the swing value meets the requirements, and if so, terminating the verification; if not, redesigning the design data until the swing value meets the requirements. The present invention can establish a vehicle model in drawing software based on the vehicle's design data, simulate the vehicle's actual turning state, and measure the vehicle's swing value, thereby obtaining the vehicle's swing value during the vehicle design phase, thereby improving measurement efficiency and reducing the manpower, material resources, time, and development costs required to redesign the vehicle when the swing value does not meet the requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle testing, and in particular relates to a design and verification method for a vehicle swing value. Background Art

[0002] The vehicle's overhang value refers to the value of any part of a vehicle or train extending beyond the vertical plane of the vehicle's outer side when transitioning from straight-line travel to a curved lane. It reflects the extent to which the vehicle encroaches on the outer lane when turning. When turning, the rear overhang of a vehicle, especially a large truck, can pose a safety threat to other vehicles and pedestrians on the road. Current methods for measuring vehicle overhang values, such as patent publication number CN201821106743, entitled "A Vehicle Overhang Value Measurement Device," are conducted through real-vehicle testing. This involves measuring the overhang value of a vehicle after production to determine if it meets the requirements. However, this method is time-consuming and inefficient. Furthermore, if the overhang value is found to be substandard after measurement, the vehicle must be redesigned and redeveloped, wasting significant manpower, material resources, time, and development costs. Therefore, designing a vehicle overhang value verification method to improve efficiency and reduce costs has become a pressing technical challenge for those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a design and verification method for the vehicle swing value to solve the above technical problems in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A design and verification method for a vehicle's outer swing value comprises the following steps:

[0006] Step S1, obtaining vehicle design data;

[0007] Step S2: Using the above design data, create a vehicle model in a drawing software;

[0008] Step S3: Using the vehicle model, measure the vehicle's outer swing value;

[0009] Step S4: determine whether the above-mentioned external swing value meets the requirements. If yes, end the verification; if not, redesign the above-mentioned design data until the external swing value meets the requirements.

[0010] Preferably, in step S1, the vehicle design data obtained include: the length and width of the vehicle; the outer contour of the vehicle in an unloaded state; the positions of the front and rear axles of the vehicle when stationary, and if the vehicle has more than two axles, the positions of all axles are obtained; the positions of the front and rear wheels of the vehicle when stationary, and if the vehicle has more than two axles, the positions of the tires on all axles are obtained; and the positions of the midpoints of the left and right kingpin axes of the front axle.

[0011] Preferably, in step S1 , the acquired vehicle design data further includes design values of an outer turning angle of a left front wheel and an inner turning angle of a right front wheel.

[0012] Preferably, in step S2, a wireframe diagram of the entire vehicle is drawn in the plane of the drawing software based on the obtained length and width of the entire vehicle and the outer contour of the entire vehicle in the unloaded state; the front axle, rear axle, front wheel and rear wheel are drawn with straight lines on the wireframe diagram of the entire vehicle based on the obtained position information of the front axle and rear axle and the front and rear wheels; the left and right kingpin axes of the front axle are marked with dots on the wireframe diagram of the entire vehicle based on the obtained position information of the midpoints of the left and right kingpin axes of the front axle, thereby completing the establishment of the entire vehicle model.

[0013] Preferably, in step S3, when measuring the vehicle's outer swing value, the following steps are included:

[0014] Step S31, placing the vehicle model vertically on the plane; drawing a left arc auxiliary line for representing the motion trajectory of the left front wheel center point when rotating around the midpoint of the left kingpin axis of the front axle, and a right arc auxiliary line for representing the motion trajectory of the right front wheel center point when rotating around the midpoint of the right kingpin axis of the front axle;

[0015] Step S32: Create the following verification auxiliary graphics on the plane: D1 with a diameter of 25m and a center of O1 on the plane; move the vehicle model into circle D1 so that the vehicle model and circle D1 meet the following conditions: the line connecting the center of circle O1 and the center of the left rear wheel coincides with the line connecting the center of circle O1 and the center of the right rear wheel, and the upper left corner of the vehicle model touches circle D1;

[0016] Step S33: Rotate the left and right front wheels so that the vehicle state and circle D1 meet the following conditions: the left and right front wheel centers are on the left and right arc auxiliary lines, respectively, and the line connecting the left front wheel center and the circle center O1 is perpendicular to the left front wheel, and the line connecting the right front wheel center and the circle center O1 is perpendicular to the right front wheel;

[0017] Step S34: Measure the actual values of the outer turning angle of the left front wheel when in the state in step S33 and the inner turning angle of the right front wheel when in the state in step S33. If both actual values are not greater than their respective design values, proceed to step S35. Otherwise, redesign the design values of the outer turning angle of the left front wheel and the inner turning angle of the right front wheel until the design values of the outer turning angle and the inner turning angle are not less than their respective actual values, and then proceed to step S35.

[0018] Step S35: Draw the following auxiliary lines in the plane: draw a circle D2, make the center of circle D2 coincide with the center of circle O1, and make the lower left corner of the vehicle model touch circle D2; then, draw an auxiliary measuring line, make the line parallel to the longitudinal direction of the vehicle model and make the line tangent to circle D2; measure the horizontal distance between the line and the leftmost side of the vehicle model; this horizontal distance is the vehicle's swing value.

[0019] Preferably, the left front wheel and the right front wheel are steering wheels.

[0020] Preferably, the drawing software is CAD.

[0021] The beneficial effects of the present invention are:

[0022] The vehicle swing value design and verification method of the present invention can establish a whole vehicle model in drawing software based on the vehicle design data, simulate the actual turning state of the vehicle, and measure the vehicle's swing value, so that the vehicle's swing value can be obtained during the vehicle design stage, thereby improving measurement efficiency and reducing the manpower, material resources, time and development costs required to redesign the vehicle when the swing value does not meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail with reference to the drawings.

[0024] Figure 1 Flowchart of the design and verification method of the vehicle swing value provided by the embodiment of the present invention:

[0025] Figure 2 A schematic diagram of a vehicle model provided in an embodiment of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 A schematic diagram of the relative positions of the circle D1 and the vehicle model provided in an embodiment of the present invention;

[0028] Figure 5A schematic diagram of an outer corner and an inner corner provided in an embodiment of the present invention;

[0029] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0030] Figure 7 Schematic diagram of the relative positions of circle D1 and circle D2 provided in an embodiment of the present invention.

[0031] In the accompanying drawings:

[0032] 11. Front axle, 12. Left front wheel, 13. Right front wheel, 14. Midpoint of right front kingpin shaft,

[0033] 15. Right arc auxiliary line, 21. Rear axle, 22. Left rear wheel, 23. Right rear wheel,

[0034] 31. Vehicle model, 32. Upper left corner, 33. Lower left corner, 41. Circle D1, 42. Center of circle O1,

[0035] 43. The line connecting the center O1 and the center point of the right rear wheel,

[0036] 44. The line connecting the center O1 and the center point of the left front wheel,

[0037] 45. The line connecting the center O1 and the center point of the right front wheel, 51. Circle D2, 61. Auxiliary measuring line, b. Outer turning angle, c. Inner turning angle, e. Horizontal distance. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the solution will be further described in detail below in conjunction with specific embodiments.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a method for designing and verifying the vehicle outer swing value, which includes the following steps:

[0040] Step S1, obtaining vehicle design data;

[0041] Step S2: Using the above design data, create a vehicle model in a drawing software;

[0042] Step S3: Using the vehicle model, measure the vehicle's outer swing value;

[0043] Step S4: determine whether the above-mentioned external swing value meets the requirements. If yes, end the verification; if not, redesign the above-mentioned design data until the external swing value meets the requirements.

[0044] The design and verification method for the vehicle's swing value provided in an embodiment of the present invention can establish a whole vehicle model in a drawing software based on the vehicle's design data, simulate the vehicle's actual turning state, and measure the vehicle's swing value, thereby obtaining the vehicle's swing value during the vehicle design stage, thereby improving measurement efficiency and reducing the manpower, material resources, time and development costs required to redesign the vehicle when the swing value does not meet the requirements.

[0045] Furthermore, in step S1, the vehicle design data obtained include: the length and width of the vehicle; the outer contour of the vehicle in an unloaded state; the positions of the front and rear axles of the vehicle when stationary, and if the vehicle has more than two axles, the positions of all axles are obtained; the positions of the front and rear wheels of the vehicle when stationary, and if the vehicle has more than two axles, the positions of the tires on all axles are obtained; and the positions of the midpoints of the left and right kingpin axes of the front axle.

[0046] Specifically, in step S1 , the acquired vehicle design data also includes design values of the outer turning angle of the left front wheel and the inner turning angle of the right front wheel.

[0047] Furthermore, in step S2, a wireframe diagram of the vehicle is drawn on a plane in the drawing software based on the obtained length and width of the vehicle and the outer contour of the vehicle in an unloaded state; the front axle, rear axle, front wheel and rear wheel are drawn with straight lines on the wireframe diagram based on the obtained position information of the front axle 11 and rear axle 21 and the position information of the front and rear wheels; the left and right kingpin midpoints of the front axle are marked with dots on the wireframe diagram based on the obtained position information of the midpoints of the left and right kingpin midpoints of the front axle, thereby completing the establishment of the vehicle model. Figure 2 As shown, taking a truck as an example, it is understandable that the front wheels include a left front wheel 12 and a right front wheel 13, and the rear wheels include a left rear wheel 22 and a right rear wheel 23.

[0048] Specifically, in step S3, when measuring the vehicle's outer swing value, the following steps are included:

[0049] Step S31, the vehicle model is placed vertically on the plane; a left arc auxiliary line is drawn to represent the motion trajectory of the left front wheel center point when it rotates around the midpoint of the left kingpin axis of the front axle, and a right arc auxiliary line 15 is drawn to represent the motion trajectory of the right front wheel center point when it rotates around the midpoint of the right kingpin axis of the front axle 14, as shown in FIG. Figure 3 As shown;

[0050] Step S32: Create the following verification auxiliary graphics on the above plane: Create a circle D1 with a diameter of 25m on the plane, with its center at O1; move the vehicle model into circle D1 so that the vehicle model and circle D1 meet the following conditions: the line connecting the center O1 and the center of the left rear wheel coincides with the line 43 connecting the center O1 and the center of the right rear wheel, and the upper left corner 32 of the vehicle model touches circle D1. Figure 4 As shown;

[0051] Step S33: Rotate the left and right front wheels so that the vehicle state and circle D1 meet the following conditions: the center points of the left and right front wheels are on the left and right arc auxiliary lines respectively, and the line 44 connecting the center point of the left front wheel and the center of the circle O1 is perpendicular to the left front wheel, and the line 45 connecting the center point of the right front wheel and the center of the circle O1 is perpendicular to the right front wheel. Figure 5 As shown;

[0052] Step S34: Figure 6 As shown, the actual values of the outer turning angle b when the left front wheel is in the state in step S33 and the inner turning angle c when the right front wheel is in the state in step S33 are measured. If the two actual values are not greater than their respective design values, step S35 is executed; otherwise, that is, if either one of the two actual values is greater than its design value or both are greater than their respective design values, the design values of the outer turning angle of the left front wheel and the inner turning angle of the right front wheel are redesigned until the design values of the outer turning angle and the inner turning angle are respectively greater than their respective actual values, and then step S35 is entered; (preferably, the design values of the inner and outer turning angles are redesigned. In this way, when changing the design values of the inner and outer turning angles, only some adaptive changes need to be made to other parameters of the wheels to meet the requirement of making the design values greater than the actual values. In this case, fewer changes are required, and the development and design efficiency is high).

[0053] Step S35: Draw the following auxiliary lines in the above plane: draw a circle D2, so that the center of circle D2 coincides with the center of circle O1, and the lower left corner 33 of the vehicle model touches circle D2; then, draw an auxiliary measuring line 61, so that the line is parallel to the longitudinal direction of the vehicle model and tangent to circle D2; measure the horizontal distance e between the line and the leftmost side of the vehicle model. This horizontal distance is the vehicle's outswing value, as shown in Figure 6. Figure 7 As shown, circle D2 is shown by a dotted line. With this solution, the vehicle's swing value can be easily measured. It can be understood that Figure 6 The dotted lines in FIG. 1 show the positions of the left front wheel and the right front wheel when not turning.

[0054] It can be understood that setting the diameter of the above-mentioned circle D1 to 25m is a necessary condition for measuring the vehicle's outward swing value, which is stipulated in the relevant regulations on outward swing value measurement. It is a value obtained by evaluating a large number of actual vehicles on actual road conditions; the regulations have requirements for the vehicle's outward swing value, so the measured outward swing value should meet the requirement to be qualified; since the midpoint of the kingpin shaft responsible for steering on the front axle, that is, the midpoint of the left front kingpin shaft and the midpoint of the right front kingpin shaft, and the center points of the corresponding front wheels, that is, the center point of the left front wheel and the center point of the right front wheel, do not coincide on the above-mentioned plane, the position information of the midpoint of the left front kingpin shaft and the midpoint of the right front kingpin shaft in the vehicle's design data is required, thereby obtaining the distance between the projection of the midpoint of the left front kingpin shaft and the center point of the left front wheel, and the projection of the midpoint of the right front kingpin shaft and the center point of the right front wheel on the above-mentioned plane, and then the above-mentioned arc auxiliary line is drawn with this distance as the radius. When the left front wheel and the right front wheel rotate, the center points of the left and right front wheels respectively make circular motions around the midpoints of their corresponding kingpin shafts, so it is necessary to draw the above two arc auxiliary lines.

[0055] Further, the left front wheel and the right front wheel are steering wheels. It is understandable that the front wheels of a general vehicle are steering wheels.

[0056] Specifically, the drawing software is CAD.

[0057] The present invention enables the measurement of a vehicle's swing value in a CAD environment during the vehicle design process using the vehicle's design data and related performance parameters, determining whether the swing value meets requirements. If not, the vehicle's design data can be modified. The present invention effectively avoids the risk of unqualified swing values being measured after a vehicle is developed. In particular, when a vehicle's swing value does not meet requirements, the method can identify it early, significantly improving work efficiency and reducing development costs.

[0058] The above are only preferred embodiments of the present invention. It should be pointed out that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, after reading the contents of the present invention, relevant technical personnel in this field can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A design and verification method for vehicle swing value, characterized in that: It includes the following steps: Step S1, obtaining vehicle design data; Step S2: Using the above design data, create a vehicle model in a drawing software; Step S3: Using the vehicle model, measure the vehicle's outer swing value; Step S4: determine whether the outer swing value meets the requirements. If yes, end the verification; if no, redesign the design data until the outer swing value meets the requirements. In step S3, when measuring the vehicle's outer swing value, the following steps are included: Step S31: Place the vehicle model vertically on a plane; draw a left arc auxiliary line representing the motion trajectory of the left front wheel center point when it rotates around the midpoint of the left kingpin axis of the front axle, and a right arc auxiliary line representing the motion trajectory of the right front wheel center point when it rotates around the midpoint of the right kingpin axis of the front axle; Step S32: Create the following verification auxiliary graphics on the plane: D1 with a diameter of 25m and a center of O1 on the plane; move the vehicle model into circle D1 so that the vehicle model and circle D1 meet the following conditions: the line connecting the center of circle O1 and the center of the left rear wheel coincides with the line connecting the center of circle O1 and the center of the right rear wheel, and the upper left corner of the vehicle model touches circle D1; Step S33: Rotate the left and right front wheels so that the vehicle state and circle D1 meet the following conditions: the left and right front wheel centers are on the left and right arc auxiliary lines, respectively, and the line connecting the left front wheel center and the circle center O1 is perpendicular to the left front wheel, and the line connecting the right front wheel center and the circle center O1 is perpendicular to the right front wheel; Step S34: Measure the actual values of the outer turning angle of the left front wheel when in the state in step S33 and the inner turning angle of the right front wheel when in the state in step S33. If both actual values are not greater than their respective design values, proceed to step S35. Otherwise, redesign the design values of the outer turning angle of the left front wheel and the inner turning angle of the right front wheel until the design values of the outer turning angle and the inner turning angle are not less than their respective actual values, and then proceed to step S35. Step S35: Draw the following auxiliary lines in the plane: draw a circle D2, make the center of circle D2 coincide with the center of circle O1, and make the lower left corner of the vehicle model touch circle D2; then, draw an auxiliary measuring line, make the line parallel to the longitudinal direction of the vehicle model and make the line tangent to circle D2; measure the horizontal distance between the line and the leftmost side of the vehicle model; this horizontal distance is the vehicle's swing value.

2. The design and verification method of the vehicle outer swing value according to claim 1 is characterized in that: In step S1, the vehicle design data obtained include: the length and width of the vehicle; the outer contour of the vehicle in an unloaded state; the positions of the front and rear axles of the vehicle when stationary, and if the vehicle has more than two axles, the positions of all axles are obtained; the positions of the front and rear wheels of the vehicle when stationary, and if the vehicle has more than two axles, the positions of the tires on all axles are obtained; and the positions of the midpoints of the left and right kingpin axes of the front axle.

3. The design and verification method of the vehicle outer swing value according to claim 2 is characterized in that: In step S1 , the acquired vehicle design data also includes design values of the outer turning angle of the left front wheel and the inner turning angle of the right front wheel.

4. The design and verification method of the vehicle outer swing value according to claim 3 is characterized in that: In step S2, a wireframe diagram of the vehicle is drawn in the plane of the drawing software based on the obtained length and width of the vehicle and the outer contour of the vehicle in the unloaded state; the front axle, rear axle, front wheel and rear wheel are drawn with straight lines on the wireframe diagram of the vehicle based on the obtained position information of the front axle and rear axle and the front and rear wheels; the left and right kingpin axes of the front axle are marked with dots on the wireframe diagram of the vehicle based on the obtained position information of the midpoints of the front axle. The vehicle model is thus established.

5. The design and verification method of the vehicle outer swing value according to claim 3 is characterized in that: The left front wheel and the right front wheel are steering wheels.

6. The design and verification method of vehicle swing value according to claim 1, characterized in that: The drawing software is CAD.

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