Vehicle carpet and design method thereof

Abstract

The invention relates to the technical field of carpets for vehicles, in particular to a carpet for vehicles and a design method thereof.The carpet comprises a carpet surface and a sound insulation pad, foot cushion blocks inclined relative to the horizontal plane are arranged between the carpet surface and the sound insulation pad, the foot cushion blocks comprise a main driving cushion block, and the main driving cushion block comprises a left foot cushion block and a right foot cushion block; the inclination angle of the left foot cushion block is an included angle between the inclined plane of the left foot cushion block and the horizontal plane towards the headstock; the included angle between the vertical line of the knee joint and the straight line of the shank towards the vehicle bottom is the knee joint angle, and the reasonable value of the knee joint angle is x; the angle between the left foot sole and the shank is an ankle joint angle, and the reasonable value of the ankle joint angle is y; the reasonable value of the inclination angle of the left foot cushion block is 90 degrees + x-y; the inclination angle of the left foot cushion block is in the intersection of the value range of the reasonable value of the inclination angle of the left foot cushion block and the value range of the non-slip angle of the left foot cushion block. By means of the inclination angle of the cushion block, the maximum protection effect can be achieved, and the comfort of a driver can be considered.

Description

Technical Field

[0001] This invention relates to the field of automotive carpet technology, specifically to an automotive carpet and its design method. Background Technology

[0002] With the continuous development of the automotive industry, the number of cars on the road has been increasing year by year, and the incidence of traffic accidents has also risen accordingly, among which car collisions causing injuries and fatalities are particularly common. As a key component inside the vehicle, the carpet assembly not only needs to meet the needs of driving and riding comfort and have sound-absorbing and insulating properties to block road noise and tire noise, but also plays an important role in improving vehicle safety performance. In vehicle crash tests, the choice of materials and engineering structure design of the carpet assembly are directly related to passenger safety. Therefore, vehicle engineers need to optimize the design to prevent the carpet from shifting during a severe collision and avoid secondary injuries to passengers.

[0003] In a frontal collision, the front edge of the car carpet compresses backward under the impact force, directly transmitting the impact force to the driver's feet. While the driver's body is restrained by the seatbelt and won't lurch forward due to inertia, their legs will swing forward. When this forward-swinging leg collides with the receding carpet, the driver's foot cannot retract in time, easily leading to foot fractures or being trapped, causing serious injury to the leg and lower leg.

[0004] To address the issue of feet swinging forward, existing technologies employ inclined pads under the driver's feet. The initial design intent is to prevent the foot from moving forward and to retract it when the carpet assembly retracts. However, existing technologies have significant drawbacks: firstly, the inclination angle of the pads is not clearly and scientifically defined, resulting in the pads failing to provide the most effective protection and thus failing to minimize foot injuries; secondly, due to the lack of optimized angle design, the pads also fail to accommodate the driver's comfortable posture, thus failing to achieve optimal protection or meet comfort requirements. Summary of the Invention

[0005] To address the technical problems in existing technologies where the tilt angle of the carpet pad is not clearly and scientifically defined, resulting in the carpet pad failing to provide the most effective protection and minimizing foot injuries, and also failing to accommodate the driver's comfortable posture while driving, this invention provides both a car carpet and a design method for a car carpet.

[0006] To achieve the above objectives, the technical solution adopted in the present invention for a car carpet is as follows: A car carpet includes a carpet surface and a sound-insulating pad. A footrest block inclined to the horizontal plane is provided between the carpet surface and the sound-insulating pad. The footrest block includes a driver's side footrest block, which includes a left footrest block. The left footrest block is inclined at an angle... The angle between the inclined surface of the left foot pad and the horizontal plane facing the front of the car; With the sole of the left foot in contact with the inclined surface of the left foot pad, draw a vertical line downwards from the knee joint as the apex. The angle between this vertical line and the line containing the lower leg pointing towards the bottom of the vehicle is the knee joint angle. knee joint angle The reasonable value of x can take any range of values. ; When the sole of the left foot is in contact with the inclined surface of the left foot pad, the angle between the sole of the left foot and the lower leg is the ankle angle. Ankle angle The reasonable value of y can take any range of values. ; Left foot pad tilt angle The reasonable value range is 90° + xy; When the ball of the left foot is in contact with the inclined surface of the left foot pad, and the carpet moves relative to the left foot towards the rear of the car, the angle at which the left foot remains stationary with respect to the inclined surface of the left foot pad is the anti-slip angle of the left foot pad. Left foot pad anti-slip angle The range of values ​​is ; Left foot pad tilt angle The angle of inclination of the left foot pad The reasonable range of values ​​and the anti-slip angle of the left foot pad The intersection of the ranges of values.

[0007] Using the above method, the knee joint angle The reasonable value of x should satisfy the following conditions: when the left foot is in contact with the inclined surface of the left foot pad, the driver's leg is most comfortable, and in the event of a collision in the opposite direction of vehicle travel, the driver's leg injury is minimized. Ankle joint angle. The reasonable value y should satisfy the condition that the driver's ankle joint is most comfortable when the left foot is in contact with the inclined surface of the left foot pad.

[0008] This invention relates to the knee joint angle Reasonable range of values, ankle joint angle Reasonable value range and anti-slip angle The range of values ​​ensures the tilt angle of the left foot pad. Simultaneously meeting the needs of safety protection and driving comfort, this design establishes a scientific and efficient mechanism for foot protection during collisions. It solves the problem of poor protective effect caused by the lack of a clearly defined angle for the pad in existing technologies, and effectively prevents the foot from swinging forward during a collision, reducing leg injuries. By using a reasonable tilt angle to guide the foot back with the carpet, it ensures that while the left foot pad prevents the foot from swinging forward, the leg joints can withstand external force within a relatively safe angle range, reducing injuries such as sprains and dislocations caused by excessive joint twisting or uneven force distribution. This comprehensively improves leg protection performance during collisions while ensuring the driver's foot fits comfortably against the pad, keeping the ankle and knee joints in a natural posture, achieving a balance between safety and comfort.

[0009] As a preferred implementation method for car carpets, the left foot pad tilt angle It is 52°.

[0010] Using the above structural design, the tilt angle of the left foot pad is... At a 52° angle, it provides maximum protection, minimizing the risk of foot fractures in a frontal collision. It guides the foot back with the carpet, reducing impact damage to the lower leg. It is also ergonomic, allowing the driver's ankle and knee joints to be in a naturally relaxed state when the feet are placed, improving comfort during long-distance driving.

[0011] As a preferred implementation of a car carpet, the driver's side mat includes a right foot mat. The angle between the inclined surface of the right foot mat and the horizontal plane facing the front of the car is the tilt angle of the right foot mat. The tilt angle of the right foot mat is equal to the tilt angle of the left foot mat.

[0012] The aforementioned structural design ensures that the tilt angle of the right foot pad is equal to that of the left foot pad, guaranteeing balanced force and symmetrical posture for the driver's feet. In the event of a collision, both feet receive consistent blocking and retraction guidance, preventing uneven force distribution or loss of balance due to differences in the angles of the left and right pads. This further reduces the risk of leg sprains and fractures. Simultaneously, the symmetrical angles allow for more coordinated force application when operating the right foot pedal, enhancing driving stability and comfort.

[0013] As a preferred implementation of car carpet, the foot pad also includes a passenger side pad, wherein the angle between the inclined surface of the passenger side pad and the horizontal plane facing the front of the car is the passenger side pad tilt angle, which is 40° to 45°.

[0014] The above-mentioned structural design, with a passenger side pad tilt angle of 40° to 45°, fills the gap in the existing technology for passenger side foot protection design. It not only meets the passenger's comfortable seating posture requirements and reduces foot fatigue during long journeys, but also effectively prevents the passenger's feet from swinging forward in the event of a collision, avoiding the toes hitting the hard point under the dashboard, thus improving the overall safety performance of the vehicle.

[0015] As a preferred implementation of car carpet, the passenger side mat has a width of 120mm and a length of 280mm. Sound insulation cotton is provided between the passenger side mat and the carpet surface, and the area of ​​the sound insulation cotton on the inclined surface of the passenger side mat is greater than or equal to 50mm².

[0016] The above structural design enhances sound insulation while ensuring foot support stability, improving the safety of the front passenger's feet and optimizing the in-vehicle acoustic environment, thus balancing safety and comfort. Specifically, the size of the front passenger footrest is adapted to the foot size of most adults, avoiding wobbling caused by insufficient support; the large area of ​​sound insulation cotton effectively blocks road noise and tire noise, optimizing the in-vehicle acoustic environment and balancing safety and ride comfort.

[0017] As a preferred implementation of car carpet, an anti-slip layer is provided on the upper surface of the carpet, corresponding to the slanted side of the left foot pad.

[0018] The above structural design incorporates an anti-slip layer at the corresponding position on the carpet surface and the diagonal side of the left foot pad, enhancing the friction between the foot and the left foot pad. In the event of a collision, this prevents the foot from sliding on the pad surface, ensuring the pad's blocking and guiding effect on the foot is precise and effective, avoiding foot pinching or secondary injury, further reducing the risk of foot pinching or fracture, and improving the reliability of the protection. During daily driving, the anti-slip layer also reduces foot displacement caused by pedal operation, improving driving stability.

[0019] The technical solution adopted in the design method of automotive carpet in this invention is as follows: A design method for automotive carpets, used to design an automotive carpet as described above, includes the following steps: Determine knee joint angle The range of safe values ​​is used to determine the knee joint angle. The range of comfort values ​​depends on the knee joint angle. The range of safe values ​​and knee joint angle The range of comfort values ​​determines the knee joint angle. The reasonable value range of x ; Determine ankle joint angle The reasonable value range of y ; According to the knee joint angle The reasonable value range of x and the ankle joint angle The reasonable range of values ​​for y determines the tilt angle of the left foot pad. The reasonable range of values, the tilt angle of the left foot pad. The reasonable value range is 90° + xy; Determine the anti-slip angle of the left foot pad. The range of values ; Based on the tilt angle of the left foot pad The reasonable range of values ​​and the anti-slip angle of the left foot pad The range of values ​​determines the tilt angle α of the left foot pad. The tilt angle α of the left foot pad is within the range of the left foot pad tilt angle. The reasonable range of values ​​and the anti-slip angle of the left foot pad The intersection of the ranges of values.

[0020] This invention provides a scientific and complete design process for automotive carpets, which determines the knee joint angle step by step. The reasonable value range of x, ankle joint angle The reasonable range of values ​​for y, and the tilt angle of the left foot pad. The reasonable range of values ​​and the anti-slip angle of the left foot pad The range of values ​​ensures that the angle of the designed left foot pad meets both safety and ergonomic comfort requirements, providing an operable standardized path for optimizing carpet safety and comfort, and improving product development efficiency and reliability.

[0021] As a preferred implementation method for the design of automotive carpets, determining the knee joint angle. The reasonable value range of x includes: When the left foot is in contact with the inclined surface of the left foot pad, the straight line where the lower leg is located is the Z-axis, the direction perpendicular to the direction of vehicle travel on the horizontal plane is the Y-axis, and the X-axis is perpendicular to both the Z-axis and the Y-axis. Determine the tibia index , ; Determine the bending moment experienced by the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , ; Determine the axial compressive force on the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , ; Determine the bending moment about the Y-axis experienced by the lower leg when the vehicle is struck in the opposite direction of travel. , ; Determine the overall safety factor , ; In the formula: The critical bending moment, Let be the bending moment about the X-axis experienced by the lower leg. Let be the bending moment about the Y-axis experienced by the lower leg. Let be the critical compressive force along the Z-axis acting on the lower leg. The impact force is in the opposite direction of the vehicle's travel. This is the distance from the point where the force of bending the lower leg is applied to the upper part of the lower leg. The actual injury moment coefficient of the upper lower leg after the external bending moment is partially offset by the knee joint resistance moment. When a vehicle is struck from the opposite direction of travel, the left footrest block will only function to block the left foot if three conditions are met: Condition 1: Axial compressive force on the lower leg Minimum; Condition 2: Tibial Index Minimum; Condition three: Minimum; The knee joint angle is obtained from conditions one, two, and three. The range of safe values; Based on human-computer interaction analysis, the knee joint angle is determined when a comfortable sitting posture is achieved and the sole of the left foot can fully contact the inclined surface of the left foot pad. The range of comfort values; According to the knee joint angle The range of safe values ​​and knee joint angle Determining the range of comfort values and The value is used to obtain the knee joint angle. The reasonable value range of x.

[0022] Determining knee joint angle through quantitative analysis The safety value range is determined by combining human-machine analysis to derive the comfort value range, ultimately arriving at a reasonable value range. This allows the design method of the present invention to balance minimizing leg injury during a collision with daily driving comfort, making the knee joint angle design more scientific and practical, and providing a precise parameter basis for the subsequent calculation of the left foot pad tilt angle.

[0023] As a preferred implementation method for the design of automotive carpets, determining the ankle joint angle is crucial. The reasonable value range of y includes: Ankle joint angle obtained from human-computer interaction analysis The reasonable value range of y.

[0024] The angle design ensures that it conforms to the physiological structure of the human body, avoids excessive flexion and extension of the ankle joint due to improper angle, reduces numbness and fatigue in the feet, improves foot comfort during driving, and provides ergonomic parameters to support the calculation of the tilt angle of the left foot pad.

[0025] As a preferred implementation method for designing car carpets, the anti-slip angle of the left foot pad is determined. The range of values ​​includes: Establish the equilibrium formula for inertial force and frictional force, and obtain and ; The formula for balancing inertial force and frictional force is: ,Right now ; In the formula: F represents the inertial force of the left foot in the direction of vehicle travel when the vehicle is hit by a collision in the opposite direction of travel, and μ represents the coefficient of friction between the ball of the left foot and the inclined surface of the left foot pad.

[0026] Based on mechanical principles, the anti-slip requirements are quantified to avoid slippage caused by insufficient angle, ensuring that the left foot pad effectively protects the foot during a collision and improving the reliability of foot protection.

[0027] The beneficial effects of this invention are as follows: This invention relates to the knee joint angle Reasonable range of values, ankle joint angle Reasonable value range and anti-slip angle The range of values ​​ensures the tilt angle of the left foot pad. It simultaneously meets the needs of safety protection and driving comfort. It not only solves the problem of poor protection caused by the lack of clear definition of the angle of the pad in the existing technology, but also effectively prevents the feet from swinging forward and reduces leg injuries during a collision, while ensuring the driver's feet fit comfortably with the pad, thus achieving a balance between safety and comfort. Attached Figure Description

[0028] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a top view of a car carpet according to a specific embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view of AA in the middle; Figure 3 This is a force analysis diagram of the left foot in a specific embodiment of the present invention; Figure 4 This is a force analysis diagram of the friction force on the left foot in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the side structure of the right foot pad.

[0030] List of components and reference numerals: 1. Carpet surface; 2. Sound insulation pad; 3. Driver's side mat; 31. Left foot mat; 32. Right foot mat; 4. Passenger side mat; 5. Anti-slip layer; 6. Pedals. Detailed Implementation

[0031] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Reference Figure 1-5 This embodiment proposes a car carpet, including a carpet surface 1 and a sound insulation pad 2. The sound insulation pad 2 is made of vertical cotton, which is molded. An opening is located at the rear end of the carpet, allowing it to be connected to other structures on the vehicle using clips that pass through the opening, thereby securing the carpet to the vehicle. Foot pads inclined to the horizontal plane are provided between the carpet surface 1 and the sound insulation pad 2. These foot pads include a driver's side pad 3 and a passenger side pad 4. Figure 1 As can be seen, the vehicle carpet in this embodiment can be used in right-hand drive vehicles.

[0033] The driver's side foot pad 3 includes a left foot pad 31 and a right foot pad 32. The left foot pad 31 is made of 15x EPP foam. An anti-slip layer 5 is provided on the upper surface of the carpet 1, corresponding to the inclined surface of the left foot pad 31. This enhances the friction between the foot and the pad, effectively preventing the foot from sliding on the pad surface during a collision. This ensures the pad's blocking and guiding effect on the foot is precise and effective, further reducing the risk of foot pinching or fracture and improving the reliability of the protection.

[0034] Left foot pad tilt angle The angle between the inclined surface of the left foot pad 31 and the horizontal plane facing the front of the vehicle is called the angle.

[0035] When the sole of the left foot is in contact with the inclined surface of the left foot pad 31, draw a vertical line downwards from the knee joint as the apex. The angle between this vertical line and the line containing the lower leg pointing towards the bottom of the vehicle is the knee joint angle. knee joint angle The reasonable value of x can take any range of values. Knee joint angle The reasonable value x should satisfy the following conditions: when the left foot is in contact with the inclined surface of the left foot pad 31, the driver's leg is most comfortable, and the driver's leg injury is minimized in the event of a collision in the opposite direction of vehicle travel. When the left foot is in contact with the inclined surface of the left foot pad 31, the angle between the left foot and the lower leg is the ankle angle. Ankle angle The reasonable value of y can take any range of values. Ankle angle The optimal value y should satisfy the condition that the driver's ankle joint is most comfortable when the left foot is in contact with the inclined surface of the left foot pad 31. The tilt angle of the left foot pad... The reasonable value range is 90° + xy. When the left foot is in contact with the inclined surface of the left foot pad 31, and the carpet moves relative to the left foot towards the rear of the vehicle, the angle at which the left foot remains stationary with respect to the inclined surface of the left foot pad 31 is the anti-slip angle of the left foot pad 31. Left foot pad 31 anti-slip angle The range of values ​​is The angle of inclination of the left foot pad. The angle of inclination of the left foot pad The reasonable value range and the anti-slip angle of the left foot pad 31 The intersection of the ranges of values.

[0036] This embodiment relates to the knee joint angle. Reasonable range of values, ankle joint angle Reasonable value range and anti-slip angle The range of values ​​ensures the tilt angle of the left foot pad. It simultaneously meets the needs of safety protection and driving comfort. It not only solves the problem of poor protection caused by the lack of clear definition of the angle of the pad in the existing technology, but also effectively prevents the feet from swinging forward and reduces leg injuries during a collision, while ensuring the driver's feet fit comfortably with the pad, thus achieving a balance between safety and comfort.

[0037] In this embodiment, the angle between the inclined surface of the right foot pad 32 and the horizontal plane facing the front of the vehicle is the tilt angle of the right foot pad, which is equal to the tilt angle of the left foot pad. This ensures that the driver's feet are balanced and their posture is symmetrical. In the event of a collision, both feet receive consistent blocking and retraction guidance, avoiding uneven force or imbalance caused by differences in the angles of the left and right pads, further reducing the risk of leg injury, and improving driving comfort and stability.

[0038] The angle between the inclined surface of the passenger seat cushion 4 and the horizontal plane facing the front of the vehicle is the tilt angle of the passenger seat cushion 4. The tilt angle of the passenger seat cushion 4 is between 40° and 45°, and can be either 40° or 45°. This tilt angle of 40° to 45° meets the comfortable seating posture requirements of the passenger seat occupant and effectively protects the passenger's feet in the event of a collision, preventing the toes from impacting the hard point in the front panel (the lower part of the dashboard). This fills the gap in existing technology regarding the lack of a suitable angle for the passenger seat cushion 4, thus improving the overall safety performance of the vehicle. The passenger seat cushion 4 is 120mm wide and 280mm long. Sound insulation cotton is installed between the passenger seat cushion 4 and the carpet surface 1. The area of ​​the sound insulation cotton on the inclined surface of the passenger seat cushion 4 is greater than or equal to 50mm², ensuring the stability of the passenger's foot support while enhancing sound absorption and insulation. This improves the safety of the passenger's feet and optimizes the in-vehicle acoustic environment, balancing safety and comfort.

[0039] The design method for automotive carpets in this embodiment is as follows: S1. Determine the knee joint angle The range of safe values, S1 includes the following steps: S11. Determine the knee joint angle. The range of safe values: according to Figure 3 When the left foot is in contact with the inclined surface of the left foot pad 31, the straight line where the lower leg is located is the Z-axis, the direction perpendicular to the direction of vehicle travel on the horizontal plane is the Y-axis, and the X-axis is perpendicular to both the Z-axis and the Y-axis. Determine the tibia index , In this embodiment The maximum score is 0.4. Determine the bending moment experienced by the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , ; Determine the axial compressive force on the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , The maximum score is 4. Determine the bending moment about the Y-axis experienced by the lower leg when the vehicle is struck in the opposite direction of travel. , ; Determine the overall safety factor , It can simultaneously evaluate and Two parameters ensure that the design scheme has a relatively optimal solution; In the formula: The critical bending moment is calculated as 225 N·m in this embodiment; This is the bending moment about the X-axis experienced by the lower leg. The bending moment in this direction is usually small and therefore is ignored in actual calculations. Let be the bending moment about the Y-axis experienced by the lower leg; The critical compressive force along the Z-axis on the lower leg is calculated as 35.9 kN in this embodiment; The impact force is the force acting against the direction of vehicle travel; in this embodiment, it is empirically taken as 4.2 Kn. The distance from the point where the bending force of the lower leg is applied to the upper part of the lower leg is the moment arm, which is empirically taken as 0.3m. The bending moment coefficient is the actual injury moment coefficient of the upper lower leg after the external bending moment is partially offset by the knee joint resistance moment. It is empirically taken as 0.08.

[0040] When the vehicle is hit by a collision in the opposite direction, the left foot pad 31 will block the left foot when it meets three conditions: Condition 1: Axial compressive force on the lower leg Minimum, that is ; Condition 2: Tibial Index Minimum, that is ; Condition three: Minimum.

[0041] From condition one, we can obtain From condition two, we can obtain From condition three, we can obtain exist It decreases within its range of values, therefore... hour, Minimum. However, considering common sense about driving posture, This means that the lower leg is in a nearly straight position relative to the thigh, that is, the left foot pad 31 is located far away from the body.

[0042] S12. Determine the knee joint angle. The range of comfort values: Since the length of the human lower leg is limited, the distance between the left foot pad 31 and the human body should be limited to the extent that the sole of the foot can still fully contact the inclined surface of the left foot pad 31. Therefore, according to ergonomic analysis, the knee joint angle when a comfortable sitting posture is achieved and the sole of the left foot can fully contact the inclined surface of the left foot pad 31 can be obtained. The comfort value should range from 57.5° to 72.5°.

[0043] S13, Based on knee joint angle The range of safe values ​​and knee joint angle Determining the range of comfort values , Thus, the knee joint angle is obtained. The reasonable value of x is within the range of 57.5°-72.5°. In this embodiment, The value can be as close as possible to 63°. At this time, the projection distance between the left foot pad 31 and the human body R point in the direction of vehicle travel is 290mm.

[0044] S2. Determine the ankle joint angle. The reasonable value range of y In this embodiment, based on human-machine analysis, the range of the most comfortable angle for the driver's ankle joint when the left foot is in contact with the inclined surface of the left foot pad can be obtained, i.e., the ankle joint angle. The reasonable range of values ​​for y; S3, based on knee joint angle The reasonable value range of x and the ankle joint angle The reasonable range of values ​​for y determines the tilt angle of the left foot pad. The reasonable range of values, the tilt angle of the left foot pad. The reasonable value range is 90° + xy; S4. Determine the anti-slip angle of the left foot pad (31). The range of values ; Determine the 31 anti-slip angle of the left foot pad. The range of values ​​includes: establishing the equilibrium formula for inertial force and frictional force, and obtaining... and ; according to Figure 4 The equilibrium formula for inertial force and frictional force is: ,Right now ; In the formula: F represents the inertial force of the left foot in the direction of vehicle travel when the vehicle is hit by a collision in the opposite direction of travel, and μ represents the coefficient of friction between the ball of the left foot and the inclined surface of the left foot pad 31. The left foot pad 31 is made of PVC with raised lines on the surface to enhance slip resistance. It has a high coefficient of friction, tested to be 1. Therefore, according to the formula for balancing inertial force and friction, we can obtain... , .

[0045] S5. Based on the tilt angle of the left foot pad The reasonable value range and the anti-slip angle of the left foot pad 31 The range of values ​​determines the tilt angle α of the left foot pad. The tilt angle α of the left foot pad is within the range of the left foot pad tilt angle. The reasonable value range and the anti-slip angle of the left foot pad 31 The intersection of the ranges of values.

[0046] In summary, in this embodiment, the tilt angle of the left foot pad is... With a 52° angle, it can maximize the protective effect and effectively reduce the risk of foot fractures in a frontal collision, while also conforming to ergonomics and improving the comfort of the driver's foot placement.

[0047] When the driver's right foot depresses the accelerator pedal 6, the maximum travel of the accelerator pedal 6 and the inclined surface of the right footrest 32 form a unified plane. At this time, the pressure on the sole of the foot is concentrated in the metatarsal area, ensuring comfort during acceleration. The height of the right footrest 32 is 35mm, and the inclination angle of the right footrest is equal to that of the left footrest, both at 52°. When the driver's right heel is placed on the right footrest 32, the foot angle is 87°. According to the SAE 95% driver's human body sitting posture angle simulation analysis, a driver's foot angle of 87-110° meets the requirements for riding comfort.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A car carpet, comprising a carpet surface (1) and a sound insulation pad (2), wherein a foot pad inclined to the horizontal plane is provided between the carpet surface (1) and the sound insulation pad (2), characterized in that, The footrests include a driver's side footrest (3), which includes a left footrest (31). The left footrest has an inclination angle. The angle between the inclined surface of the left foot pad (31) and the horizontal plane facing the front of the vehicle; When the sole of the left foot is in contact with the inclined surface of the left foot pad (31), draw a vertical line downward from the knee joint with the knee joint as the apex. The angle between the vertical line of the knee joint and the straight line of the lower leg pointing towards the bottom of the vehicle is the knee joint angle. knee joint angle The reasonable value of x can take any range of values. ; When the sole of the left foot is in contact with the inclined surface of the left foot pad (31), the angle between the sole of the left foot and the lower leg is the ankle angle. Ankle angle The reasonable value of y can take any range of values. ; Left foot pad tilt angle The reasonable value range is 90° + xy; When the sole of the left foot is in contact with the inclined surface of the left foot pad (31), and the carpet moves relative to the left foot towards the rear of the vehicle, the angle at which the left foot remains stationary with respect to the inclined surface of the left foot pad (31) is the anti-slip angle of the left foot pad (31). Left foot pad (31) anti-slip angle The range of values ​​is ; Left foot pad tilt angle The angle of inclination of the left foot pad The reasonable value range and the anti-slip angle of the left foot pad (31) The intersection of the ranges of values.

2. The automotive carpet according to claim 1, characterized in that, Left foot pad tilt angle It is 52°.

3. A car carpet according to claim 1 or 2, characterized in that, The driver's seat pad (3) includes a right foot pad (32). The angle between the inclined surface of the right foot pad (32) and the horizontal plane facing the front of the vehicle is the tilt angle of the right foot pad. The tilt angle of the right foot pad is equal to the tilt angle of the left foot pad.

4. The automotive carpet according to claim 1, characterized in that, The foot pad also includes a passenger side pad (4). The angle between the inclined surface of the passenger side pad (4) and the horizontal plane facing the front of the vehicle is the tilt angle of the passenger side pad (4). The tilt angle of the passenger side pad (4) is 40° to 45°.

5. A car carpet according to claim 4, characterized in that, The width of the passenger side pad (4) is 120mm and the length is 280mm. There is sound insulation cotton between the passenger side pad (4) and the carpet surface (1). The area of ​​the sound insulation cotton on the inclined surface of the passenger side pad (4) is greater than or equal to 50mm².

6. A car carpet according to claim 1, characterized in that, An anti-slip layer (5) is provided on the upper surface of the carpet (1) and the sloping side of the left foot pad (31).

7. A design method for automotive carpets, characterized in that, The method for designing a vehicle carpet as described in any one of claims 1-8 includes the following steps: Determine knee joint angle The range of safe values ​​is used to determine the knee joint angle. The range of comfort values ​​depends on the knee joint angle. The range of safe values ​​and knee joint angle The range of comfort values ​​determines the knee joint angle. The reasonable value range of x ; Determine ankle joint angle The reasonable value range of y ; According to the knee joint angle The reasonable value range of x and the ankle joint angle The reasonable range of values ​​for y determines the tilt angle of the left foot pad. The reasonable range of values, the tilt angle of the left foot pad. The reasonable value range is 90° + xy; Determine the anti-slip angle of the left foot pad (31) The range of values ; Based on the tilt angle of the left foot pad The reasonable value range and the anti-slip angle of the left foot pad (31) The range of values ​​determines the tilt angle α of the left foot pad. The tilt angle α of the left foot pad is within the range of the left foot pad tilt angle. The reasonable value range and the anti-slip angle of the left foot pad (31) The intersection of the ranges of values.

8. The design method for automotive carpets according to claim 7, characterized in that, Determine knee joint angle The reasonable value range of x includes: When the left foot is in contact with the inclined surface of the left foot pad (31), the straight line where the lower leg is located is the Z axis, and the direction perpendicular to the direction of vehicle travel on the horizontal plane is the Y axis. The X axis is perpendicular to both the Z axis and the Y axis. Determine the tibia index , ; Determine the bending moment experienced by the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , ; Determine the axial compressive force on the lower leg when the vehicle is subjected to a collision in the opposite direction of travel. , ; Determine the bending moment about the Y-axis experienced by the lower leg when the vehicle is struck in the opposite direction of travel. , ; Determine the overall safety factor , ; In the formula: The critical bending moment, Let be the bending moment about the X-axis experienced by the lower leg. Let be the bending moment about the Y-axis experienced by the lower leg. Let be the critical compressive force along the Z-axis acting on the lower leg. The impact force is in the opposite direction of the vehicle's travel. This is the distance from the point where the force of bending the lower leg is applied to the upper part of the lower leg. The actual injury moment coefficient of the upper lower leg after the external bending moment is partially offset by the knee joint resistance moment. When the vehicle is hit by a collision in the opposite direction, the left foot pad (31) will meet three conditions to block the left foot: Condition 1: Axial compressive force on the lower leg Minimum; Condition 2: Tibial Index Minimum; Condition 3: minimum; The knee joint angle is obtained from conditions one, two, and three. The range of safe values; According to human-computer interaction analysis, the knee joint angle is obtained when a comfortable sitting posture is achieved and the sole of the left foot can fully contact the inclined surface of the left foot pad (31). The range of comfort values; According to the knee joint angle The range of safe values ​​and knee joint angle Determining the range of comfort values and The value is used to obtain the knee joint angle. The reasonable value range of x.

9. The design method for a car carpet according to claim 7, characterized in that, Determine ankle joint angle The reasonable value range of y includes: Ankle joint angle obtained from human-computer interaction analysis The reasonable value range of y.

10. The design method for a car carpet according to claim 7, characterized in that, Determine the anti-slip angle of the left foot pad (31) The range of values ​​includes: Establish the equilibrium formula for inertial force and frictional force, and obtain and ; The formula for balancing inertial force and frictional force is: ,Right now ; In the formula: F represents the inertial force of the left foot in the direction of vehicle travel when the vehicle is hit by a collision in the opposite direction of travel, and μ represents the coefficient of friction between the left foot and the inclined surface of the left foot pad (31).

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