An iterative design method for large steering angle of commercial vehicles

Abstract

An iterative design method for large steering angles of commercial vehicles, which determines the maximum inner steering angle a and the maximum outer steering angle b of the vehicle; the introduction of functions quantifies the large steering angle design process in the form of functions; the goal is clear, the positioning cycle process is simple and clear, and the introduction of influencing factors controls the risk of the distance between the tire and the frame being too close, the distance between the tire and the outermost side of the cab being too close or even interference during the development of large steering angles of commercial vehicles. The proposed method greatly simplifies the workload of enterprise R & D personnel in the large steering angle design process.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicle manufacturing, and particularly relates to a method for iterative design of large steering angles of commercial vehicles. Background Art

[0002] In recent years, the rapid development of the transportation industry has promoted the rapid development of automobiles. Due to the limitation of the steering angle of automobiles, it is laborious for drivers to steer and turn around in narrow road conditions. Therefore, it is necessary to develop a large steering angle for commercial vehicles to make it easier for drivers to steer and turn around in narrow road conditions. However, during the design process of large steering angles, it is difficult to accurately control the reserved amount of the minimum distance between the tire and the cab rear suspension and the steering drag link. Therefore, there is an urgent need to propose a large steering angle design method that can solve the above problems. Summary of the Invention

[0003] In order to overcome the above deficiencies in technology, the present invention provides a method for iterative design of large steering angles of commercial vehicles that saves workload and improves efficiency.

[0004] The technical solution adopted by the present invention to overcome its technical problems is as follows:

[0005] The following combines the appended Figure 1 To illustrate the final confirmation of the wheelbase L2 in a method for iterative design of large steering angles of commercial vehicles according to an embodiment of the present invention. In this embodiment, L6 is the minimum distance between the tire and the outermost side of the cab in the straight-ahead state. By controlling the size of L6, the size of the wheelbase L2 is finally confirmed.

[0006] Combined with the appended Figure 2 To illustrate the final confirmation of the frame width L1 in a method for iterative design of large steering angles of commercial vehicles according to an embodiment of the present invention. In this embodiment, the frame width L1 is finally confirmed by controlling the minimum distance L3 between the front-end tire of the frame and the frame, the minimum distance L4 between the rear-end tire of the frame and the frame, and the minimum distance L5 between the condenser and the frame.

[0007] Combined with the appended Figure 3 To illustrate the final confirmation of the maximum inner steering angle a and the maximum outer steering angle b in a method for iterative design of large steering angles of commercial vehicles according to an embodiment of the present invention.

[0008] Specifically, a method for iterative design of large steering angles of commercial vehicles includes the following steps:

[0009] a) Initial inner steering angle a0 and initial outer steering angle b0;

[0010] b) If the minimum distance between the front-end tire of the frame and the frame is greater than or equal to the threshold value A and the minimum distance between the rear-end tire of the frame and the frame is equal to the threshold value B, then execute step c). If the minimum distance between the front-end tire of the frame and the frame is less than the threshold value A and the minimum distance between the rear-end tire of the frame and the frame is not equal to the threshold value B, then initialize the frame width and wheelbase and return to execute step a);

[0011] c) If the minimum distance between the condenser and the vehicle frame is greater than or equal to the threshold value C, then step d) is executed. If the minimum distance between the condenser and the vehicle frame is less than the threshold value C, then return to execute step a);

[0012] d) If the minimum distance between the tire and the outermost side of the cab in the straight-ahead state is greater than or equal to the threshold value D, then step e) is executed. If the minimum distance between the tire and the outermost side of the cab in the straight-ahead state is less than the threshold value D, then return to execute step a); e) Calculate the transfer objective function f(L1, L2, L3, L4) and output the maximum inner turning angle and the maximum outer turning angle of the vehicle.

[0013] Preferably, in step b), the threshold value A is 50 mm and the threshold value B is 60 mm.

[0014] Preferably, in step c), the threshold value C is 20 mm.

[0015] Preferably, in step d), the threshold value D is 15 mm.

[0016] Furthermore, in step e) The transfer objective function f(L1, L2, L3, L4) is calculated. In the formula, r is the tire radius, μ1 is the influence factor of the minimum distance between the front tire of the vehicle frame and the vehicle frame, μ2 is the influence factor of the minimum distance between the rear tire of the vehicle frame and the vehicle frame, μ3 is the influence factor of the minimum distance between the condenser and the vehicle frame, and μ4 is the influence factor of the minimum distance between the tire and the outermost side of the cab.

[0017] Furthermore, the value range of μ1 is 0.99 - 1.01, the value range of μ2 is 0.99 - 1.02, the value range of μ3 is 0.98 - 1.04, and the value range of μ4 is 0.97 - 1.03

[0018] Preferably, the value of μ1 is 1.01, the value of μ2 is 0.99, the value of μ3 is 1, and the value of μ4 is 1.02.

[0019] The beneficial effects of the present invention are: determining the maximum inner turning angle a and the maximum outer turning angle b of the vehicle; the introduction of the function quantifies the large turning angle design process in the form of a function; the goal is clear, the positioning cycle process is simple and clear, and the introduction of the influence factors μ1, μ2, μ3, and μ4 controls the risk of the distance between the tire and the vehicle frame being too close, the distance between the tire and the outermost side of the cab being too close or even interfering during the development of the large turning angle of the commercial vehicle. The proposed method greatly simplifies the workload of the enterprise R & D personnel in the large turning angle design process. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the positional relationship among the tire, the cab, and the vehicle frame of the present invention;

[0021] Figure 2Schematic diagram of the positional relationship among the tire, the frame, and the cooling module of the present invention;

[0022] Figure 3 Flowchart of the method for quickly confirming the maximum inner turning angle and the maximum outer turning angle of an automobile of the present invention;

[0023] In the figure, a. Maximum inner turning angle; b. Maximum outer turning angle; L1. Frame width; L2. Wheelbase; r. Tire radius; L3. Minimum distance between the front-end tire of the frame and the frame; L4. Minimum distance between the rear-end tire of the frame and the frame; L5. Minimum distance between the condenser and the frame; L6. Minimum distance between the tire and the outermost side of the cab in the straight-ahead state. Specific embodiments

[0024] The following further describes the present invention in conjunction with Figure 1 the Figure 2 the Figure 3 accompanying drawings.

[0025] A method for iterative design of large turning angles of commercial vehicles includes the following steps:

[0026] a) Initial inner turning angle a0 and initial outer turning angle b0;

[0027] b) If the minimum distance L3 between the front-end tire of the frame and the frame is greater than or equal to the threshold A and the minimum distance L4 between the rear-end tire of the frame and the frame is equal to the threshold B, then step c) is executed; if the minimum distance L3 between the front-end tire of the frame and the frame is less than the threshold A and the minimum distance L4 between the rear-end tire of the frame and the frame is not equal to the threshold B, then the frame width L1 and the wheelbase L2 are initialized and then step a) is returned to be executed.

[0028] c) If the minimum distance L5 between the condenser and the frame is greater than or equal to the threshold C, then step d) is executed; if the minimum distance L5 between the condenser and the frame is less than the threshold C, then step a) is returned to be executed.

[0029] d) If the minimum distance L6 between the tire and the outermost side of the cab in the straight-ahead state is greater than or equal to the threshold D, then step e) is executed; if the minimum distance L6 between the tire and the outermost side of the cab in the straight-ahead state is less than the threshold D, then step a) is returned to be executed;

[0030] e) Calculate the turning objective function f(L1, L2, L3, L4) and output the maximum inner turning angle a and the maximum outer turning angle b of the automobile.

[0031] Confirm the maximum inner turning angle α and the maximum outer turning angle β of the vehicle; the introduction of the function quantifies the large turning angle design process in the form of a function; the goal is clear, and the positioning loop process is simple and clear. The introduction of the influencing factors μ1, μ2, μ3, and μ4 controls the risk of the distance between the tire and the frame being too close, the distance between the tire and the outermost side of the cab being too close or even interfering during the development of the large turning angle of commercial vehicles. The proposed method greatly simplifies the workload of enterprise R & D personnel in the large turning angle design process.

[0032] In a specific embodiment of the present invention, in step b), the threshold value A is 50 mm, and the threshold value B is 60 mm. In step c), the threshold value C is 20 mm. In step d), the threshold value D is 15 mm.

[0033] In a specific embodiment of the present invention, in step e) Calculate the transfer objective function f(L1, L2, L3, L4). In the formula, r is the tire radius, μ1 is the influencing factor of the minimum distance between the front-end tire of the frame and the frame, μ2 is the influencing factor of the minimum distance between the rear-end tire of the frame and the frame, μ3 is the influencing factor of the minimum distance between the condenser and the frame, and μ4 is the influencing factor of the minimum distance between the tire and the outermost side of the cab.

[0034] Furthermore, the value range of μ1 is 0.99 - 1.01, the value range of μ2 is 0.99 - 1.02, the value range of μ3 is 0.98 - 1.04, and the value range of μ4 is 0.97 - 1.03. In a specific embodiment of the present invention, the value of μ1 is 1.01, the value of μ2 is 0.99, the value of μ3 is 1, and the value of μ4 is 1.02.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An iterative design method for large steering angles of commercial vehicles, characterized in that, Including the following steps: a) Initial inner turning angle a0, initial outer turning angle b0; b) If the minimum distance (L3) between the front-end tire of the vehicle frame and the vehicle frame is greater than or equal to the threshold A and the minimum distance (L4) between the rear-end tire of the vehicle frame and the vehicle frame is equal to the threshold B, then execute step c). If the minimum distance (L3) between the front-end tire of the vehicle frame and the vehicle frame is less than the threshold A and the minimum distance (L4) between the rear-end tire of the vehicle frame and the vehicle frame is not equal to the threshold B, then initialize the vehicle frame width (L1) and the wheelbase (L2) and return to execute step a); c) If the minimum distance (L5) between the condenser and the vehicle frame is greater than or equal to the threshold C, then execute step d). If the minimum distance (L5) between the condenser and the vehicle frame is less than the threshold C, then return to execute step a); d) If the minimum distance (L6) between the tire and the outermost side of the cab in the straightened state is greater than or equal to the threshold D, then execute step e). If the minimum distance (L6) between the tire and the outermost side of the cab in the straightened state is less than the threshold D, then return to execute step a); e) Calculate the cornering objective function and output the maximum inner cornering angle (a) and the maximum outer cornering angle (b) of the vehicle; In step e) The transfer objective function is calculated , where is the tire radius is the minimum distance influence factor between the front tire of the frame and the frame is the minimum distance influence factor between the rear tire of the frame and the frame is the minimum distance influence factor between the condenser and the frame is the minimum distance influence factor between the tire and the outermost side of the cab 2. The iterative design method for large steering angle of commercial vehicles according to claim 1, characterized in that: In step b), the threshold A is 50 mm and the threshold B is 60 mm.

3. The iterative design method for large steering angle of commercial vehicles according to claim 1, characterized in that: In step c), the threshold C is 20 mm.

4. The iterative design method for large steering angles of commercial vehicles according to claim 1, characterized in that: In step d), the threshold D is 15 mm.

5. The iterative design method for large steering angle of commercial vehicles according to claim 1, characterized in that: The value range is 0.99 - 1.01, The value range is 0.99 - 1.02, The value range is 0.98 - 1.04, The value range is 0.97 - 1.

03.

6. The iterative design method for large steering angle of commercial vehicles according to claim 5, characterized in that: The value is 1.01, The value is 0.99, The value is 1, The value is 1.02.

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