Design method and system of light truck front suspension, rear suspension and wheelbase
By calculating parameters such as the vehicle's approach angle, departure angle, and longitudinal passing radius, and combining them with the objective function, the front overhang, rear overhang, and wheelbase are automatically adjusted. This solves the problem of difficult parameter confirmation in the design process of light-duty trucks and realizes an efficient and accurate design method.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SINO TRUK JINAN POWER CO LTD
- Filing Date
- 2022-12-28
- Publication Date
- 2026-05-19
AI Technical Summary
The lack of a unified method for the design of front overhang, rear overhang and wheelbase of light trucks in the current technology leads to a complicated design process and makes it difficult to quickly identify suitable parameters, which increases the workload of designers and makes it difficult to achieve universal design.
By calculating parameters such as the vehicle's approach angle, departure angle, and longitudinal passing radius, and combining them with an objective function, the front overhang, rear overhang, and wheelbase are automatically adjusted to meet design requirements, providing a design method and system for the front overhang, rear overhang, and wheelbase of light-duty trucks.
It improves the efficiency and accuracy of front overhang, rear overhang and wheelbase design, reduces the workload of designers, is applicable to all two-axle light trucks, and saves computing costs.
Smart Images
Figure CN115828435B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a design method and system for the front overhang, rear overhang, and wheelbase of a light-duty truck, belonging to the field of automotive design technology. Background Technology
[0002] The front overhang, rear overhang, and wheelbase are the most basic parameters in automobile size design, and also the foundation for the design of other vehicle control systems. The design of the front overhang, rear overhang, and wheelbase not only affects the vehicle's external dimensions, but also is closely related to its performance. This is especially important for cargo trucks, where selecting the appropriate wheelbase and front and rear overhang lengths based on the cargo transport needs is crucial.
[0003] The front overhang, rear overhang, and wheelbase of light-duty trucks not only affect their passability and steering performance, but also the rational distribution of load when the vehicle is under load. Excessive or insufficient length of the front and rear overhangs and wheelbase will impact overall vehicle performance. Excessively long front and rear overhangs affect passability and steering performance, while an excessively long wheelbase affects longitudinal passability and reduces vehicle maneuverability. Conversely, an excessively short wheelbase will decrease vehicle stability. However, current light-duty trucks are limited by vehicle type, resulting in varying requirements for front and rear overhang lengths and wheelbases. There is no unified design method to determine the rationality of front and rear overhang and wheelbase designs, making it difficult to achieve universal design. Furthermore, designers cannot immediately determine the appropriate size of the front and rear overhangs and wheelbase during the design process. If the wheelbase changes, a complete redesign is necessary, leading to repeated adjustments to the size of the front and rear overhangs and wheelbase, significantly increasing the workload of designers. Therefore, a design method for the front and rear overhangs and wheelbase of light-duty trucks that can solve the above problems is needed. Summary of the Invention
[0004] To address the aforementioned problems, this invention proposes a design method and system for the front overhang, rear overhang, and wheelbase of a light-duty truck, which can improve the efficiency and accuracy of the design of the front overhang, rear overhang, and wheelbase.
[0005] The technical solution adopted by this invention to solve its technical problem is as follows:
[0006] On one hand, the present invention provides a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck, comprising the following steps:
[0007] S1, input the initial front overhang, initial rear overhang, and initial wheelbase;
[0008] S2, calculate the vehicle approach angle, determine whether the approach angle meets the approach angle control requirements, if yes, execute S3, otherwise return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase and minimum ground clearance of the bumper.
[0009] S3, calculate the vehicle departure angle, determine whether the departure angle meets the departure angle control requirements, if yes, execute S4, otherwise return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase and minimum ground clearance of the rear protection.
[0010] S4, calculate the longitudinal passing radius of the vehicle, and determine whether the longitudinal passing radius meets the radius control requirements. If yes, execute S5; otherwise, return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase L3 and minimum ground clearance of the fuel tank.
[0011] S5 outputs the front overhang, rear overhang, and wheelbase based on the objective functions of the front overhang, rear overhang, and wheelbase.
[0012] As one possible implementation of this embodiment, the calculation of the vehicle approach angle and the determination of whether the approach angle meets the approach angle control requirements include:
[0013] The formula for calculating the approach angle α of a vehicle is:
[0014] a = arctg(H1 / L1)
[0015] In the formula, L1 represents the front suspension of the car, and H1 represents the minimum ground clearance of the bumper;
[0016] When the vehicle's approach angle a ≥ 19°, the approach angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H1 of the bumper.
[0017] As one possible implementation of this embodiment, the step of calculating the vehicle departure angle and determining whether the departure angle meets the departure angle control requirements includes:
[0018] The formula for calculating the departure angle b of a car is:
[0019] b = arctg(H2 / L2)
[0020] In the formula, L2 represents the rear overhang of the vehicle, and H2 represents the minimum ground clearance of the rear protective frame.
[0021] When the vehicle's departure angle b ≥ 16°, the departure angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H2 of the rear protection.
[0022] As one possible implementation of this embodiment, the step of calculating the longitudinal passing radius of the vehicle and determining whether the longitudinal passing radius meets the radius control requirements includes:
[0023] The longitudinal radius R1 of the car is obtained using geometric construction methods.
[0024] When the vehicle passes through a longitudinal radius R1≥12m, the radius control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H3 of the fuel tank.
[0025] As one possible implementation of this embodiment, the step of outputting the front overhang, rear overhang, and wheelbase according to the objective function of the front overhang, rear overhang, and wheelbase includes:
[0026] The objective functions for front overhang, rear overhang, and wheelbase are:
[0027]
[0028] In the formula, H1 is the minimum ground clearance of the bumper, H2 is the minimum ground clearance of the rear protection, H3 is the minimum ground clearance of the fuel tank, R1 is the longitudinal passing radius, R2 is the tire radius, a is the approach angle, b is the departure angle, δ1 is the minimum ground clearance control factor of the bumper, δ2 is the minimum ground clearance control factor of the rear protection of the frame, and δ3 is the longitudinal passing radius control factor.
[0029] When the results meet the requirements, select the current front overhang L1, rear overhang L2 and wheelbase L3 as the final output front overhang L10, rear overhang L20 and wheelbase L30.
[0030] As one possible implementation of this embodiment, the minimum ground clearance control factor δ1 of the bumper is 0.83 to 1.13, the minimum ground clearance control factor δ2 of the rear protection of the frame is 0.85 to 1.17, and the longitudinal passing radius control factor δ3 is 0.98 to 1.01.
[0031] On the other hand, an embodiment of the present invention provides a design system for the front overhang, rear overhang, and wheelbase of a light-duty truck, comprising:
[0032] The input module is used to input the initial front overhang, initial rear overhang, and initial wheelbase.
[0033] The approach angle calculation module is used to calculate the vehicle's approach angle and determine whether the approach angle meets the approach angle control requirements.
[0034] The departure angle calculation module is used to calculate the vehicle's departure angle and determine whether the departure angle meets the departure angle control requirements.
[0035] The longitudinal passing radius calculation module is used to calculate the longitudinal passing radius and determine whether the longitudinal passing radius meets the radius control requirements;
[0036] The output module is used to output the front overhang, rear overhang, and wheelbase based on the objective functions of the front overhang, rear overhang, and wheelbase.
[0037] Thirdly, an embodiment of the present invention provides a computer device including a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the AGV simulation device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of any of the above-described design methods for the front overhang, rear overhang, and wheelbase of a light-duty truck.
[0038] Fourthly, embodiments of the present invention provide a readable storage medium storing a computer program, which, when run by a processor, executes the steps of any of the above-described design methods for the front overhang, rear overhang, and wheelbase of a light-duty truck.
[0039] The technical solutions of the embodiments of the present invention can have the following beneficial effects:
[0040] In this embodiment, the front overhang length is controlled by controlling the approach angle and the bumper ground clearance; the wheelbase is controlled by controlling the minimum ground clearance of the fuel tank and the longitudinal passing radius; and the rear overhang length is controlled by controlling the departure angle and the minimum ground clearance of the rear guard. The introduction of functions allows the design process of the front overhang, rear overhang, and wheelbase to be quantified in functional form. The introduction of control factors allows for precise control of the values of the front overhang, rear overhang, and wheelbase in the design process of light trucks. This method greatly reduces the workload of enterprise designers in the design process of the front overhang, rear overhang, and wheelbase.
[0041] The method of this invention can quickly select the appropriate size of the front overhang, rear overhang and wheelbase, reducing the workload and improving the efficiency and accuracy of the design of the front overhang, rear overhang and wheelbase. It is applicable to all two-axle light trucks, saves the calculation cost of other methods, and increases practicality. Attached Figure Description
[0042] Figure 1 This is a flowchart illustrating a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck according to an exemplary embodiment;
[0043] Figure 2 This is a schematic diagram illustrating a design system for the front overhang, rear overhang, and wheelbase of a light-duty truck according to an exemplary embodiment;
[0044] Figure 3 This is a flowchart illustrating front overhang, rear overhang, and wheelbase design using the system described in this invention, according to an exemplary embodiment.
[0045] Figure 4This is a positional relationship diagram shown according to an exemplary embodiment (where L10 is the front overhang; L20 is the rear overhang; L30 is the wheelbase; H1 is the minimum ground clearance of the bumper; H2 is the minimum ground clearance of the rear guard; H3 is the minimum ground clearance of the fuel tank; a is the approach angle; b is the departure angle; R1 is the longitudinal passing radius; R2 is the tire radius). Detailed Implementation
[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0047] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure of the invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components, processing techniques, and processes are omitted in this invention to avoid unnecessarily limiting the invention.
[0048] like Figure 1 As shown in the figure, an embodiment of the present invention provides a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck, comprising the following steps:
[0049] S1, input the initial front overhang, initial rear overhang, and initial wheelbase;
[0050] S2, calculate the vehicle approach angle, determine whether the approach angle meets the approach angle control requirements, if yes, execute S3, otherwise return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase and minimum ground clearance of the bumper.
[0051] S3, calculate the vehicle departure angle, determine whether the departure angle meets the departure angle control requirements, if yes, execute S4, otherwise return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase and minimum ground clearance of the rear protection.
[0052] S4, calculate the longitudinal passing radius of the vehicle, and determine whether the longitudinal passing radius meets the radius control requirements. If yes, execute S5; otherwise, return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase L3 and minimum ground clearance of the fuel tank.
[0053] S5 outputs the front overhang, rear overhang, and wheelbase based on the objective functions of the front overhang, rear overhang, and wheelbase.
[0054] As one possible implementation of this embodiment, the calculation of the vehicle approach angle and the determination of whether the approach angle meets the approach angle control requirements include:
[0055] The formula for calculating the approach angle α of a vehicle is:
[0056] a = arctg(H1 / L1)
[0057] In the formula, L1 represents the front suspension of the car, and H1 represents the minimum ground clearance of the bumper;
[0058] When the vehicle's approach angle a ≥ 19°, the approach angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H1 of the bumper.
[0059] As one possible implementation of this embodiment, the step of calculating the vehicle departure angle and determining whether the departure angle meets the departure angle control requirements includes:
[0060] The formula for calculating the departure angle b of a car is:
[0061] b = arctg(H2 / L2)
[0062] In the formula, L2 represents the rear overhang of the vehicle, and H2 represents the minimum ground clearance of the rear protective frame.
[0063] When the vehicle's departure angle b ≥ 16°, the departure angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H2 of the rear protection.
[0064] As one possible implementation of this embodiment, the step of calculating the longitudinal passing radius of the vehicle and determining whether the longitudinal passing radius meets the radius control requirements includes:
[0065] The longitudinal radius R1 of the car is obtained using geometric construction methods.
[0066] When the vehicle passes through a longitudinal radius R1≥12m, the radius control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H3 of the fuel tank.
[0067] As one possible implementation of this embodiment, the step of outputting the front overhang, rear overhang, and wheelbase according to the objective function of the front overhang, rear overhang, and wheelbase includes:
[0068] The objective functions for front overhang, rear overhang, and wheelbase are:
[0069]
[0070] In the formula, H1 is the minimum ground clearance of the bumper, H2 is the minimum ground clearance of the rear protection, H3 is the minimum ground clearance of the fuel tank, R1 is the longitudinal passing radius, R2 is the tire radius, a is the approach angle, b is the departure angle, δ1 is the minimum ground clearance control factor of the bumper, δ2 is the minimum ground clearance control factor of the rear protection of the frame, and δ3 is the longitudinal passing radius control factor.
[0071] When the results meet the requirements, select the current front overhang L1, rear overhang L2 and wheelbase L3 as the final output front overhang L10, rear overhang L20 and wheelbase L30.
[0072] As one possible implementation of this embodiment, the minimum ground clearance control factor δ1 of the bumper is 0.83 to 1.13, the minimum ground clearance control factor δ2 of the rear protection of the frame is 0.85 to 1.17, and the longitudinal passing radius control factor δ3 is 0.98 to 1.01.
[0073] like Figure 2 As shown in the figure, an embodiment of the present invention provides a design system for the front overhang, rear overhang, and wheelbase of a light-duty truck, comprising:
[0074] The input module is used to input the initial front overhang, initial rear overhang, and initial wheelbase.
[0075] The approach angle calculation module is used to calculate the vehicle's approach angle and determine whether the approach angle meets the approach angle control requirements.
[0076] The departure angle calculation module is used to calculate the vehicle's departure angle and determine whether the departure angle meets the departure angle control requirements.
[0077] The longitudinal passing radius calculation module is used to calculate the longitudinal passing radius and determine whether the longitudinal passing radius meets the radius control requirements;
[0078] The output module is used to output the front overhang, rear overhang, and wheelbase based on the objective functions of the front overhang, rear overhang, and wheelbase.
[0079] like Figure 3 As shown, the process of designing the front overhang, rear overhang, and wheelbase using the system described in this invention includes the following steps:
[0080] S1, input the initial front overhang L1, initial rear overhang L2 and initial wheelbase L3;
[0081] S2, calculate the vehicle approach angle, determine whether the approach angle meets the approach angle control requirements, if yes, execute S3, otherwise return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H1 of the bumper;
[0082] The formula for calculating the approach angle α of a vehicle is:
[0083] a = arctg(H1 / L1)
[0084] In the formula, L1 represents the front suspension of the car, and H1 represents the minimum ground clearance of the bumper;
[0085] When the vehicle's approach angle a ≥ 19°, the approach angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H1 of the bumper.
[0086] S3, calculate the vehicle departure angle, determine whether the departure angle meets the departure angle control requirements, if yes, execute S4, otherwise return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H2 of the rear protection.
[0087] The formula for calculating the departure angle b of a car is:
[0088] b = arctg(H2 / L2)
[0089] In the formula, L2 represents the rear overhang of the vehicle, and H2 represents the minimum ground clearance of the rear protective frame.
[0090] When the vehicle's departure angle b ≥ 16°, the departure angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H2 of the rear protection.
[0091] S4, calculate the longitudinal passing radius of the vehicle, and determine whether the longitudinal passing radius meets the radius control requirements. If yes, execute S5; otherwise, return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase L3 and minimum ground clearance of the fuel tank.
[0092] The longitudinal radius R1 of the car is obtained using geometric construction methods.
[0093] When the vehicle passes through a longitudinal radius R1≥12m, the radius control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H3 of the fuel tank.
[0094] S5 outputs the front overhang L10, rear overhang L20 and wheelbase L30 based on the objective functions of the front overhang, rear overhang and wheelbase.
[0095] The objective functions for front overhang, rear overhang, and wheelbase are:
[0096]
[0097] In the formula, H1 is the minimum ground clearance of the bumper, H2 is the minimum ground clearance of the rear protection, H3 is the minimum ground clearance of the fuel tank, R1 is the longitudinal passing radius, R2 is the tire radius, a is the approach angle, b is the departure angle, δ1 is the minimum ground clearance control factor of the bumper, δ2 is the minimum ground clearance control factor of the rear protection of the frame, and δ3 is the longitudinal passing radius control factor.
[0098] When the results meet the requirements, select the current front overhang, rear overhang, and wheelbase as the final output.
[0099] The minimum ground clearance control factor δ1 for the bumper is set at 0.83 to 1.13, the minimum ground clearance control factor δ2 for the rear frame protection is set at 0.85 to 1.17, and the longitudinal passing radius control factor δ3 is set at 0.98 to 1.01.
[0100] In this embodiment, the minimum ground clearance control factor for the bumper is set to 0.9; the minimum ground clearance control factor for the rear guard is set to 0.95; and the longitudinal passing radius control factor is set to 1.
[0101] according to Figure 4 It can be seen that the positional relationships between the front and rear overhangs, wheelbase, minimum ground clearance of the bumper, minimum ground clearance of the rear guard, minimum ground clearance of the rear guard, minimum ground clearance of the fuel tank, approach angle, departure angle, and longitudinal passing radius are known. In this embodiment, the front overhang length is controlled by controlling the approach angle and the bumper ground clearance, the wheelbase is controlled by controlling the minimum ground clearance of the fuel tank and the longitudinal passing radius, and the rear overhang length is controlled by controlling the departure angle and the minimum ground clearance of the rear guard.
[0102] Thirdly, a computer device includes a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck as described above.
[0103] An embodiment of the present invention provides a computer device including a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of any of the above-described design methods for the front overhang, rear overhang, and wheelbase of a light-duty truck.
[0104] Specifically, the aforementioned memory and processor can be general-purpose memory and processor, without any specific limitations. When the processor runs the computer program stored in the memory, it can execute the aforementioned design method for the front overhang, rear overhang, and wheelbase of a light-duty truck.
[0105] Those skilled in the art will understand that the structure of the computer device does not constitute a limitation on the computer device, and may include more or fewer components than shown in the figure, or combine some components, or split some components, or have different component arrangements.
[0106] In some embodiments, the computer device may further include a touchscreen for displaying a graphical user interface (e.g., an application launch screen) and receiving user actions on the graphical user interface (e.g., launching an application). Specifically, the touchscreen may include a display panel and a touch panel. The display panel may be configured as an LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), or similar type. The touch panel can collect user touch or non-touch operations on or near it and generate pre-set operation instructions, such as user actions using fingers, styluses, or any suitable object or accessory on or near the touch panel. Additionally, the touch panel may include a touch detection device and a touch controller. The touch detection device detects the user's touch orientation and posture, and detects the signals generated by the touch operation, transmitting the signals to the touch controller. The touch controller receives touch information from the touch detection device, converts it into information that the processor can process, sends it to the processor, and can also receive and execute commands from the processor. Furthermore, touch panels can be implemented using various types of sensors, including resistive, capacitive, infrared, and surface acoustic wave sensors, as well as any future technologies. Moreover, the touch panel can cover the display panel. Users can operate on or near the touch panel, which is covered by the graphical user interface displayed on the display panel. After detecting the operation on or near the touch panel, the touch panel transmits it to the processor to determine the user input. The processor then responds to the user input by providing corresponding visual output on the display panel. Additionally, the touch panel and display panel can be implemented as two separate components or integrated together.
[0107] Corresponding to the above application startup method, this embodiment of the invention also provides a storage medium storing a computer program, which, when run by a processor, executes the steps of any of the above-described design methods for the front overhang, rear overhang, and wheelbase of a light-duty truck.
[0108] The application launch device provided in this application embodiment can be specific hardware on the device or software or firmware installed on the device. The device provided in this application embodiment has the same implementation principle and technical effects as the foregoing method embodiments. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the foregoing method embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can all be referred to the corresponding processes in the above method embodiments, and will not be repeated here.
[0109] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0110] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.
[0111] The modules described as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.
[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A design method for the front overhang, rear overhang, and wheelbase of a light-duty truck, characterized in that, Includes the following steps: S1, input the initial front overhang, initial rear overhang, and initial wheelbase; S2, calculate the vehicle approach angle, and determine whether the approach angle meets the approach angle control requirements. If yes, execute S3; otherwise, return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase, and minimum ground clearance of the bumper. S3, calculate the vehicle departure angle, determine whether the departure angle meets the departure angle control requirements, if yes, execute S4, otherwise return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase and minimum ground clearance of the rear protection. S4, calculate the longitudinal passing radius of the vehicle, and determine whether the longitudinal passing radius meets the radius control requirements. If yes, execute S5; otherwise, return to S1 to readjust the initial front suspension, initial rear suspension, initial wheelbase L3 and minimum ground clearance of the fuel tank. S5 outputs the front overhang, rear overhang, and wheelbase based on the objective functions for the front overhang, rear overhang, and wheelbase; specifically including: The objective functions for front overhang, rear overhang, and wheelbase are: In the formula, H1 is the minimum ground clearance of the bumper, H2 is the minimum ground clearance of the rear protection, H3 is the minimum ground clearance of the fuel tank, R1 is the longitudinal passing radius, R2 is the tire radius, a is the approach angle, and b is the departure angle. This is the minimum ground clearance control factor for the bumper. This is the minimum ground clearance control factor for the rear protection of the vehicle frame. This is the longitudinal radius control factor; When the results meet the requirements, select the current front overhang L1, rear overhang L2 and wheelbase L3 as the final output front overhang L10, rear overhang L20 and wheelbase L30.
2. The design method for the front overhang, rear overhang, and wheelbase of a light-duty truck according to claim 1, characterized in that, The calculation of the vehicle approach angle and the determination of whether the approach angle meets the approach angle control requirements include: The formula for calculating the approach angle α of a vehicle is: In the formula, L1 represents the front suspension of the car, and H1 represents the minimum ground clearance of the bumper; When the vehicle's approach angle a ≥ 19°, the approach angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H1 of the bumper.
3. The design method for the front overhang, rear overhang, and wheelbase of a light-duty truck according to claim 1, characterized in that, The calculation of the vehicle departure angle and the determination of whether the departure angle meets the departure angle control requirements include: The formula for calculating the departure angle b of a car is: In the formula, L2 represents the rear overhang of the vehicle, and H2 represents the minimum ground clearance of the rear protective frame. When the vehicle's departure angle b ≥ 16°, the departure angle control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3, and minimum ground clearance H2 of the rear protection.
4. The design method for the front overhang, rear overhang, and wheelbase of a light-duty truck according to claim 1, characterized in that, The calculation of the vehicle's longitudinal passing radius and the determination of whether the longitudinal passing radius meets the radius control requirements include: The longitudinal radius R1 of the car is obtained using geometric construction methods. When the vehicle passes through a longitudinal radius R1≥12m, the radius control requirement is met; otherwise, return to S1 to readjust the initial front suspension L1, initial rear suspension L2, initial wheelbase L3 and minimum ground clearance H3 of the fuel tank.
5. The design method for the front overhang, rear overhang, and wheelbase of a light-duty truck according to claim 1, characterized in that, The minimum ground clearance control factor for the bumper 0.83~1.13, Minimum ground clearance control factor for rear frame protection 0.85~1.17, longitudinal radius control factor 0.98~1.
01.
6. A design system for the front overhang, rear overhang, and wheelbase of a light-duty truck, characterized in that, include: The input module is used to input the initial front overhang, initial rear overhang, and initial wheelbase. The approach angle calculation module is used to calculate the vehicle's approach angle and determine whether the approach angle meets the approach angle control requirements. The departure angle calculation module is used to calculate the vehicle's departure angle and determine whether the departure angle meets the departure angle control requirements. The longitudinal passing radius calculation module is used to calculate the longitudinal passing radius and determine whether the longitudinal passing radius meets the radius control requirements; The output module is used to output the front overhang, rear overhang, and wheelbase based on the objective functions for front overhang, rear overhang, and wheelbase; specifically, it includes: The objective functions for front overhang, rear overhang, and wheelbase are: In the formula, H1 is the minimum ground clearance of the bumper, H2 is the minimum ground clearance of the rear protection, H3 is the minimum ground clearance of the fuel tank, R1 is the longitudinal passing radius, R2 is the tire radius, a is the approach angle, and b is the departure angle. This is the minimum ground clearance control factor for the bumper. This is the minimum ground clearance control factor for the rear protection of the vehicle frame. This is the longitudinal radius control factor; When the results meet the requirements, select the current front overhang L1, rear overhang L2 and wheelbase L3 as the final output front overhang L10, rear overhang L20 and wheelbase L30.
7. A computer device, characterized in that, The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions that the processor can execute. When the computer device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck as described in any one of claims 1-5.
8. A readable storage medium, characterized in that, The readable storage medium stores a computer program that, when executed by a processor, implements the steps of a design method for the front overhang, rear overhang, and wheelbase of a light-duty truck as described in any one of claims 1-5.