A method for dividing the area of ​​the automobile central control screen based on the driver's hand reachability

Abstract

The present invention relates to a method for dividing the area of ​​a car central control screen based on the driver's hand accessibility, and belongs to the field of automobile ergonomics technology, and specifically to a method for dividing the area of ​​a car central control screen. The purpose of the present invention is to solve the problem that the existing division of the interactive area of ​​the car central control screen interface is inaccurate. During driving, the difficult-to-reach areas will significantly increase the difficulty of operation, and even cause misoperation, thereby affecting driving safety. The process is: calculate the parameter equation of the central control screen and the spherical parameter equation corresponding to the activity radius corresponding to different arm activity radii; calculate the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space; calculate the parameter equation of each interactive area of ​​the car central control screen's hand accessibility; derive the two-dimensional parameter equation of each interactive area of ​​the car central control screen's hand accessibility, and thus complete the division of the interactive area of ​​the car central control screen's difficulty of operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile ergonomics, and in particular relates to a method for dividing an automobile central control screen area. Background Art

[0002] With the rapid development of automobile intelligence and human-computer interaction technology, the central control screen of the car has become the core interactive interface of the vehicle information system. However, the difficulty of operating the central control screen directly affects driving safety and user experience. Especially during driving, the driver needs to use the touch screen to navigate, adjust the air conditioner, control the audio, etc. while focusing on the driving task. Therefore, how to reasonably divide the interactive areas with different operating difficulties has become a crucial link in the design of the central control screen.

[0003] In the existing central control screen interface design, the difficulty of operation mainly depends on the interface layout and the distribution of functional areas. In traditional design, the division of various functional areas is mostly based on the logic of visual cognition, and the accessibility of the driver's hands is less considered. In fact, due to differences in the driver's seat position, arm length and screen size, some areas on the screen may be difficult to reach. Especially during driving, such difficult-to-reach areas will significantly increase the difficulty of operation and even cause misoperation, which in turn affects driving safety. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing method of dividing the interactive areas of the operation difficulty of the automobile central control screen interface area is inaccurate. During driving, the difficult-to-reach areas will significantly increase the difficulty of operation and even cause misoperation, thereby affecting driving safety. A method for dividing the automobile central control screen area based on the reachability of the driver's hands is proposed.

[0005] The specific process of the method for dividing the area of ​​the automobile central control screen based on the driver's hand reachability is as follows:

[0006] Step 1: Establish a three-dimensional coordinate system of the car cockpit space;

[0007] Step 2: Determine the comfort angle range of each part of the driver's arm;

[0008] Step 3: Select a human body size design reference standard, and calculate the three-dimensional position range of the driver's right shoulder point in the three-dimensional coordinate system of the cockpit space based on steps 1 and 2;

[0009] Step 4: Calculate the arm's comfortable activity radius and touchable activity radius based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm;

[0010] Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to the activity radius corresponding to different arm activity radii;

[0011] Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated;

[0012] Step 5: Calculate the parameter equations of each interactive area of ​​the car's central control screen's hand accessibility based on step 4;

[0013] Step 6: Based on step 5, derive the two-dimensional parameter equations of each interactive area of ​​the car's central control screen's hand accessibility.

[0014] The beneficial effects of the present invention are

[0015] Based on the reachability of the driver's hands, the three-dimensional position difference between the driver's shoulder point and the car's central control screen is considered to divide the car's central control screen interface into interactive areas of different operating difficulties. The positions of controls that need to be touched and clicked on the interface can be reasonably allocated, thereby improving the driving experience and driving safety.

[0016] The present invention takes the center point of the steering wheel as the coordinate origin, establishes a space coordinate system for the cockpit of an automobile, takes the fifth percentile of the static human body size of Chinese adult males as a reference, calculates the three-dimensional position range of the right shoulder point of the driver in the cockpit space coordinate system according to the arm posture of the driver holding the steering wheel, and then obtains the hand-reachable activity radius through the comfort angle range of each part of the driver's arm under the condition that the driver maintains the driving posture, and then takes the position of the driver's right shoulder leaning on the chair back as the sphere center, draws an arc on the automobile central control screen and intersects with the hand-reachable activity radius, and obtains a parameter equation corresponding to the hand-reachable activity radius on the central control screen, and then divides the automobile central control screen into three interactive areas with increasing operating difficulty from left to right according to the hand-reachability according to the intersection line of the spherical arc corresponding to the arm activity radius and the central control screen, and calculates the three-dimensional coordinate system parameter equation corresponding to each interactive area, and finally derives the two-dimensional parameter equation corresponding to each interactive area of ​​the central control screen according to the conversion formula between the two-dimensional coordinate system of the central control screen and the three-dimensional coordinate system of the cockpit. The present invention aims to divide the central control screen interface into different interactive areas through precise analysis and calculation of the driver's hand reach, optimize the functional area layout according to the difficulty of operation, ensure that important functions are easy to reach, reduce the risk of misoperation, and improve driving experience and driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of the method of the present invention;

[0018] Figure 2The recommended measurement method diagram for the driver's hand control reach area proposed by the SAE J287 standard;

[0019] Figure 3 is a schematic diagram of the cockpit space coordinate system, V is the position of the driver's eyes center, S is the position of the driver's right shoulder against the seat back, H30 is the height from the driver's seat reference point to the accelerator pedal heel point; H17 is the vertical distance from the steering wheel center to the accelerator pedal heel point; AHP is the accelerator pedal heel point; SgRP is the driver's seat reference point, Oxyz is the three-dimensional coordinate system of the cockpit space;

[0020] Figure 4 This is a three-dimensional diagram of the car's central control screen. , for The intersection points with the upper and lower boundaries of the central control plane, , for The intersection points with the upper and lower boundaries of the central control plane, , for The intersection points with the upper and lower boundaries of the central control plane, O The origin of the cockpit space three-dimensional coordinate system O ; l is the length of the central control screen. The tilt angle of the central control screen; M It is the top left vertex of the central control screen. N It is the top right vertex of the central control screen;

[0021] Figure 5 This is a schematic diagram of the interactive areas of the car's central control screen that are within reach of the hand. Oxyz is the three-dimensional coordinate system of the cockpit space;

[0022] Figure 6 It is a two-dimensional coordinate diagram of the car's central control screen. O is the origin of the three-dimensional coordinate system of the cockpit space, i The coordinate axis corresponding to the length of the central control screen, j The coordinate axis corresponding to the width of the central control screen. DETAILED DESCRIPTION

[0023] Specific implementation method 1: The specific process of the method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility in this implementation method is as follows:

[0024] Step 1: Establish a three-dimensional coordinate system of the car cockpit space;

[0025] Step 2: Determine the comfort angle range of each part of the driver's arm;

[0026] Step 3: Select a human body size design reference standard, and calculate the three-dimensional position range of the driver's right shoulder point in the three-dimensional coordinate system of the cockpit space based on steps 1 and 2;

[0027] Step 4: Calculate the arm's comfortable activity radius and touchable activity radius based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm;

[0028] Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to the activity radius corresponding to different arm activity radii;

[0029] Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated;

[0030] Step 5: Calculate the parameter equations of each interactive area of ​​the car's central control screen's hand accessibility based on step 4;

[0031] Step 6: Based on step 5, the two-dimensional parameter equations of each interactive area of ​​the car's central control screen's hand accessibility are derived, thus completing the division of the interactive areas of the car's central control screen's operating difficulty.

[0032] Considering that the main evaluation objects of this study - layout evaluation elements (application icons, application cards, etc.) are designed and arranged on the two-dimensional plane of the central control screen, it is impossible to directly judge the hand-reachable interactive area of ​​the central control screen interface layout evaluation elements based on the parameter equation of the hand-reachable interactive area in the cockpit coordinate system. Therefore, it is necessary to combine the external dimensions of the central control screen (the length of both sides of the central control screen) and the screen resolution (for example, 1920px×1080px) to convert the three-dimensional parameter equation of the hand-reachable interactive area in the cockpit coordinate system into the two-dimensional parameter equation of the central control screen interface. The hand-reachable interactive area of ​​each layout evaluation element is obtained at the interface prototype design level.

[0033] After establishing the reference coordinate system and solving the equation for the hand-reachable interactive area of ​​the central control screen, the division of the interactive area of ​​the difficulty of operating the car's central control screen is completed.

[0034] Specific implementation method 2: This implementation method is different from the specific implementation method 1 in that the three-dimensional coordinate system of the vehicle cockpit space is established in step 1; the specific process is:

[0035] The center point of the steering wheel is the origin of the three-dimensional coordinate system of the cockpit space O , taking the front and rear horizontal plane direction from the front to the rear of the vehicle as the coordinate system x Axis direction, with the left and right horizontal planes as the coordinate systemy Axis direction, vertical xy Plane as Coordinate System z The cockpit space coordinate system is established in the axis direction;

[0036] Refer to the recommended measurement method for the driver's hand-controlled reach area proposed in the SAE J287 standard. Figure 2 As shown, with the position of the driver's right shoulder joint resting on the chair back as the origin of the spatial spherical coordinate system, arcs are drawn on the central control screen using the arm comfort activity arc and the touch activity arc when the driver maintains a driving posture. These arcs represent the intersection lines of the spherical surface of the driver's finger-touchable area and the plane where the central control screen is located. The hand-touchable interaction area of ​​the central control screen can be divided through these intersection lines.

[0037] The test method published by SAE is simplified by selecting the reference point in the cockpit of the car, the center point of the steering wheel, which is fixed and can clearly reflect the position of the driver's shoulder point and the spatial placement of the central control screen. The center point of the steering wheel is used as the origin of the three-dimensional coordinate system of the cockpit, and the front and rear horizontal plane is used as the coordinate system. x Axis direction, with the left and right horizontal planes as the coordinate system y Axis direction, with the vertical plane as the coordinate system z The cockpit space coordinate system is established in the axis direction as follows Figure 3 shown.

[0038] The space coordinate system of the car cockpit x The coordinate difference in the axis direction reflects the x The difference between the front and rear horizontal planes of the cockpit in the negative direction of the axis; y The coordinate difference in the axis direction reflects the direction close to the driver. y The horizontal plane difference between the left and right sides of the cockpit in the negative direction of the axis; z The coordinate difference in the axis direction reflects the z The difference of the cockpit vertical surface in the positive direction of the axis.

[0039] The other steps and parameters are the same as those in the first embodiment.

[0040] Specific implementation method three: This implementation method is different from specific implementation methods one or two in that the comfort angle range of each part of the driver's arm is determined in step two;

[0041] The specific process is:

[0042] When the driver maintains the driving posture, the comfort angle range of each joint of the driver's arm includes:

[0043] The angle between the driver's shoulder and the plumb line Comfort angle range (the angle between the driver's shoulder and the plumb plane (a plane perpendicular to the ground));

[0044] The angle of the driver's upper arm relative to the plumb line Comfort angle range;

[0045] The angle between the driver's forearm and upper arm Comfort angle range;

[0046] The angle of the driver's hand relative to the forearm Comfort angle range.

[0047] Upper arm: The part from the shoulder to the elbow, which is mainly responsible for connecting the shoulder and forearm. Forearm: The part from the elbow to the wrist. Hand: The end of the forearm, including the palm and fingers. In simple terms, the upper arm is the upper part of the arm, the forearm is the lower part, and the hand is the end of the forearm.

[0048] According to Wang Xin et al., further revisions were made to the driver's posture comfort in Ergonomics, further limiting the range of driving posture comfort.

[0049] The other steps and parameters are the same as those in the first or second embodiment.

[0050] Specific implementation method 4: This implementation method is different from the first to third specific implementation methods in that the intersection of the comfortable angle ranges of the driver's arm joints obtained by the above scholars is obtained to obtain the angle of the driver's shoulder relative to the plumb line when the driver maintains the driving posture. The comfort angle range is 20~30°;

[0051] The angle of the driver's upper arm relative to the plumb line The comfort angle range is 10~45°;

[0052] The angle between the driver's forearm and upper arm The comfort angle range is 80~120°;

[0053] The angle of the driver's hand relative to the forearm The comfort angle range is 170~190°.

[0054] The other steps and parameters are the same as those in Specific Embodiments 1 to 3.

[0055] Specific implementation method 5: This implementation method is different from any one of specific implementation methods 1 to 4 in that, in step 3, a human body size design reference standard is selected, and the three-dimensional position range of the driver's right shoulder point in the three-dimensional coordinate system of the cockpit space is calculated based on step 1 and step 2;

[0056] The specific process is:

[0057] According to the driver's arm posture when holding the steering wheel under dynamic driving conditions, the processing from step 21 to step 22 is performed:

[0058] Step 31: Select the reference standard for human body size design; the specific process is:

[0059] When dividing the interactive area of ​​the car's central control screen by hand reachability, the interface area should be divided considering most of the driver groups. Human body size percentiles are usually used as a reference for design. The common human body size percentages are 5%, 50% and 95%. The 5% human body size percentage indicates that the design does not meet the human body size requirements of less than 5%, the 50% human body size percentage indicates that the design does not meet the human body size requirements of 50% of people, and the 95% human body size percentage indicates that the design does not meet the human body size requirements of less than 95%. The national standard for human body size GB / T 10000-2023 counts the three human body size percentages.

[0060] In order to meet the operating comfort and accessibility requirements of most drivers, the fifth quantile of the static human body size of Chinese adult males is mainly used as the design reference;

[0061] Step 32: Calculate the driver's right shoulder point x , y , z Axis position range; the specific process is:

[0062] Step 321: Calculate the driver's right shoulder point y Axis position range:

[0063] According to the driver's arm posture when holding the steering wheel under dynamic driving conditions, it is concluded that the driver is facing the steering wheel, that is, the left and right horizontal plane distance between the driver's shoulder point and the center point of the steering wheel is approximately equal to half of the driver's shoulder width.

[0064]

[0065] In the formula, d y It is the horizontal distance from the driver's right shoulder point to the center point of the steering wheel. w s5 is the shoulder width corresponding to the 5th quantile of static body size of Chinese adult males, w s95 The shoulder width corresponding to the 95th percentile of static body size of Chinese adult males;

[0066] Step 322: Calculate the driver's right shoulder point x Axis position range:

[0067] Driver's right shoulderx The axis position range consists of the maximum distance from the driver's right shoulder point to the center of the steering wheel in the front and rear horizontal plane and the minimum distance from the driver's right shoulder point to the steering wheel in the front and rear horizontal plane;

[0068] Calculate the maximum horizontal distance from the driver's right shoulder point to the center of the steering wheel:

[0069] According to the driver's arm posture when holding the steering wheel under dynamic driving conditions, the maximum distance between the driver's right shoulder point and the front and rear horizontal plane of the steering wheel is approximately equal to the driver's arm in a fully extended state, and then the distance (50mm) of the operating component held by the driver's palm as specified in the SAE J287 standard is subtracted.

[0070]

[0071] In the formula, d xmax It is the maximum horizontal distance from the driver's right shoulder point to the center of the steering wheel. l 1. l 2. l 3 are the upper arm length, forearm length and hand length corresponding to the 5th quantile of static body size of Chinese adult males;

[0072] Calculate the minimum distance between the driver's right shoulder point and the front and rear horizontal plane of the steering wheel:

[0073] The minimum distance between the driver's right shoulder point and the front and rear horizontal plane of the steering wheel is approximately equal to the minimum horizontal plane projection value of the driver's upper arm relative to the shoulder at its comfortable angle, plus the minimum horizontal plane projection value of the driver's forearm relative to the upper arm at its comfortable angle, and the minimum horizontal plane projection value of the hand relative to the forearm at its comfortable angle, and then subtract the distance (50mm) of the operating component held by the driver's palm as specified in the SAE J287 standard.

[0074]

[0075] In the formula, It is the minimum horizontal distance from the driver's right shoulder point to the center of the steering wheel. l 1. l 2. l 3 are the upper arm length, forearm length and hand length corresponding to the 5th quantile of static body size of Chinese adult males;

[0076] middle belong , middle belong , middle belong , middle belong ;

[0077] Step 323: Calculate the driver's right shoulder point z Axis position range:

[0078] According to the driver's arm posture when holding the steering wheel under dynamic driving conditions, the maximum distance between the driver's right shoulder point and the vertical plane of the steering wheel is approximately equal to the maximum empirical value of the height from the driver's sitting reference point (SgRP) to the accelerator pedal heel point (AHP) and the dimension from point H to the shoulder in SAE J1517 when the driver is sitting, and finally the minimum empirical value of the vertical distance from the center of the steering wheel to the AHP is subtracted.

[0079] Driver's right shoulder z The axis position range consists of the maximum vertical distance from the driver's right shoulder point to the center point of the steering wheel and the minimum vertical distance from the driver's right shoulder point to the center point of the steering wheel;

[0080] Calculate the maximum vertical distance from the driver's right shoulder point to the center point of the steering wheel:

[0081]

[0082] In the formula, d zmax H30 is the maximum vertical distance from the driver’s right shoulder to the center of the steering wheel. max The maximum empirical value of the height from the driver's riding reference point (SgRP) to the accelerator pedal heel point (AHP) (the H30 value proposed in GB / T 43402-2023 is between 127mm and 405mm). a 1. a 2 are the ratios of the height from the shoulders to the soles of the feet and the height from the hip joint to the soles of the feet of Chinese adult males when standing, respectively. h H17 is the height corresponding to the 5th percentile of adult males in China. min It is the minimum empirical value of the vertical distance from the center of the steering wheel to the accelerator pedal heel point (AHP) (the H17 value proposed in GB / T 43402-2023 is between 530mm and 838mm);

[0083] The minimum distance from the driver's right shoulder point to the vertical plane of the steering wheel is approximately equal to the minimum empirical value of the height from the driver's sitting reference point (SgRP) to the accelerator pedal heel point (AHP) and the dimension from the H point to the shoulder in SAE J1517 when the driver is sitting, and finally subtract the maximum empirical value of the vertical distance from the center of the steering wheel to the AHP.

[0084] Calculate the minimum vertical distance from the driver's right shoulder point to the center point of the steering wheel:

[0085]

[0086] In the formula, d zmin H30 is the minimum vertical distance from the driver's right shoulder point to the center of the steering wheel. min The minimum empirical value for the height from the driver's riding reference point (SgRP) to the accelerator pedal heel point (AHP), H17 max It is the maximum empirical value of the vertical distance from the center of the steering wheel to the accelerator pedal heel point (AHP).

[0087] The other steps and parameters are the same as those in Specific Embodiments 1 to 4.

[0088] Specific implementation method six: This implementation method is different from any one of specific implementation methods one to five in that, in step four, the arm comfort activity radius and touchable activity radius are calculated based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm;

[0089] Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii;

[0090] Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated;

[0091] The specific process is:

[0092] According to the comfortable angle range of the driver's arms when the driver maintains the driving posture, with the position of the driver's right shoulder against the seat back as the center of the sphere, the arm's comfortable activity radius and touchable activity radius, draw an arc on the car's central control screen and intersect to perform steps 41 to 43:

[0093] Step 41: Based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm, calculate the arm's comfortable activity radius and touchable activity radius;

[0094] The specific process is:

[0095] Step 4.1. Based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm, calculate the arm comfort activity radius:

[0096] According to the comfortable angle range corresponding to each part of the arm when the driver maintains the driving posture, the 5th percentile body size of Chinese adult males is selected as the reference basis, and the sum of the projection values ​​of the three main parts of the arm, namely the upper arm, forearm and hand, along the same plane is taken as the comfortable activity radius of the arm;

[0097] The minimum and maximum values ​​of the arm's comfortable activity radius correspond to the minimum and maximum values ​​of the sum of the projection values ​​of the above three main arm components along the same plane. Taking the front and rear horizontal plane as the projection plane, the minimum value of the arm's comfortable activity radius is numerically equal to the sum of the minimum projection length values ​​of the upper arm, forearm and hand on the projection plane; the maximum value of the arm's comfortable activity radius is numerically equal to the sum of the maximum projection length values ​​of the upper arm, forearm and hand on the projection plane;

[0098]

[0099] In the formula, R 1 are the minimum and maximum values ​​of the comfortable arm movement radius, l 1. l 2. l 3 are the upper arm length, forearm length and hand length corresponding to the 5th quantile of static body size of Chinese adult males;

[0100] middle In belong , In belong , In belong , In belong ;

[0101] middle In belong , In belong , In belong , In belong ;

[0102] Step 4-2: Calculate the arm's touchable radius:

[0103] The arm touchable activity radius is the length of the driver's fully extended arm. Beyond this activity radius, the driver needs to shrug his shoulders forward or move his body to the right to successfully complete the touch screen interaction. The arm touchable activity radius is approximately equal to the sum of the lengths of the upper arm, forearm and hand;

[0104]

[0105] In the formula, The arm's touchable activity radius. , , They are the upper arm length, forearm length and hand length corresponding to the 5th quantile of static body size of Chinese adult males;

[0106] Step 42: Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii;

[0107] Step 43: Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, calculate the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space.

[0108] The other steps and parameters are the same as those in Specific Implementation Methods 1 to 5.

[0109] Specific implementation method 7: This implementation method is different from the specific implementation methods 1 to 6 in that, in step 42, the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii are calculated based on the arm comfort activity radius and the touchable activity radius; the specific process is:

[0110] Step 421: Calculate the central control screen parameter equation; the specific process is:

[0111] like Figure 4 The length of the central control screen in the three-dimensional coordinate system of the cockpit space is l , the height is h , the tilt angle of the central control screen is , the center point of the central control screen P The three-dimensional coordinates are , the upper left corner of the central control screen M The three-dimensional coordinates are , the upper right corner of the central control screen N The three-dimensional coordinates are , we get two non-collinear vectors of the central control screen , ;

[0112] The normal vector of the central control screen in the three-dimensional coordinate system of the cockpit space is , They represent the three-dimensional coordinate system of the cockpit space along x axis, y axis, z Unit vectors in the directions of the axes; these unit vectors are the orthonormal basis vectors;

[0113] According to the perpendicularity between the central control screen vector and the normal vector, we get:

[0114]

[0115] Thus we get:

[0116] Center console screen normal vector

[0117] The center point of the central control screen P The three-dimensional coordinates are and the center console screen normal vector Substitute the point formal equation of the spatial plane in the spatial rectangular coordinate system , the central control panel parameter equation is obtained as:

[0118]

[0119] in,

[0120] in, is the coordinate of any point on the spatial plane in the spatial rectangular coordinate system; is the coordinate of a known point on the spatial plane in the spatial rectangular coordinate system, A , B , C The three-axis coordinates of the normal vector of the space plane in the space rectangular coordinate system respectively; are the three-axis coordinates in the three-dimensional coordinate system of the cockpit space;

[0121] Step 422: Calculate the spherical parameter equation corresponding to different arm activity radii; the specific process is:

[0122] The spherical equation corresponding to the arm activity radius only needs to translate the original coordinate system origin—the driver's right shoulder point—to the cockpit space coordinate system origin—the steering wheel center point through the space coordinate system, and then obtain the spherical equation corresponding to different arm activity radii;

[0123] The spherical parameter equation corresponding to the minimum value of the arm's comfortable activity radius is:

[0124]

[0125] Spherical parameter equation corresponding to the maximum value of the arm's comfortable activity radius:

[0126]

[0127] The spherical parameter equation corresponding to the arm's touchable activity radius:

[0128]

[0129] In the formula, a 1. b 1. c 1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back in the three-dimensional coordinate system of the cockpit space; R 0. R 1. R 2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius in the three-dimensional coordinate system of the cockpit space.

[0130] The other steps and parameters are the same as those in Specific Embodiments 1 to 6.

[0131] Specific implementation eight: This implementation is different from specific implementations one to seven in that, in step four-three, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii; the specific process is:

[0132] According to the intersection of the central control screen in the cockpit space coordinate system and the spherical equations corresponding to different arm activity radii, the corresponding arm activity radius space coordinate system parameter equation is obtained;

[0133] Step 431: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the minimum arm comfortable activity radius of step 422, calculate the parameter equation of the minimum arm comfortable activity radius in the three-dimensional coordinate system of the cockpit space:

[0134]

[0135] in

[0136] Step 432: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the maximum arm comfortable activity radius of step 422, calculate the parameter equation of the maximum arm comfortable activity radius in the three-dimensional coordinate system of the cockpit space:

[0137]

[0138] in

[0139] Step 433: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the arm touchable activity radius of step 422, calculate the parameter equation of the arm touchable activity radius in the three-dimensional coordinate system of the cockpit space:

[0140]

[0141] in

[0142] In the formula, a 1. b 1. c 1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back in the three-dimensional coordinate system of the cockpit space;

[0143] a 0. c 0 are the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space. x axis, z Coordinates in the axis direction; is the tilt angle of the central control screen;

[0144] R 0. R 1. R 2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius.

[0145] The other steps and parameters are the same as those in Specific Embodiments 1 to 7.

[0146] Specific implementation method 9: This implementation method is different from any one of specific implementation methods 1 to 8 in that the parameter equations of each interactive area of ​​the hand accessibility of the automobile central control screen are calculated based on step 4 in step 5; the specific process is:

[0147] The driver's right shoulder point is taken as the sphere center, and the minimum and maximum values ​​of the arm's comfortable activity radius and the touchable activity radius intersect with the car's central control screen respectively. According to the intersection line of the spherical arc corresponding to the arm's activity radius and the central control screen, the car's central control screen is divided into interactive areas according to the hand's reachability. From left to right, the three interactive areas of the best hand reachability, touchable area, and worst interactive area are obtained. Figure 5 shown.

[0148] Optimal interaction area: The middle area is formed by the intersection of the spherical arc corresponding to the minimum arm comfort radius and the central control screen, and the intersection of the spherical arc corresponding to the maximum arm comfort radius and the central control screen as the left and right boundary lines. The layout elements and controls in this interaction area can be easily reached by the driver by adjusting the bending angle of each part of the arm so that they are all within the comfort range.

[0149] Touchable area: The middle area is formed by the intersection of the spherical arc corresponding to the maximum arm comfort radius on the central control screen and the central control screen surface, and the intersection of the spherical arc corresponding to the touchable activity radius and the central control screen surface as the left and right boundary lines. The layout elements and controls in this interactive area can be touched by the driver by adjusting the bending angle of each part of the arm without moving the shoulder point.

[0150] Worst interaction area: The right area is formed by the intersection of the spherical arc corresponding to the touchable active radius on the central control screen and the central control screen as the left boundary line. The layout elements and controls in this interaction area cannot be touched even if the driver's arms are fully extended. They can only be touched by adjusting the position of the shoulder point.

[0151] According to the three-dimensional coordinate distance between the driver's right shoulder point and the center point of the steering wheel, as well as the arm's comfortable activity radius and touchable activity radius, the parameter equations of the spatial coordinate system of each interactive area of ​​the car's central control screen are obtained.

[0152] Optimal interaction zone parameter equation:

[0153]

[0154] in

[0155] Parametric equations of the touchable area:

[0156]

[0157] in

[0158] Worst interaction zone parameter equation:

[0159]

[0160] in

[0161] In the formula, a 1. b 1. c 1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back in the three-dimensional coordinate system of the cockpit space;

[0162] a 0. c 0 are the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space. x axis, z Coordinates in the axis direction; is the tilt angle of the central control screen;

[0163] R 0.R 1. R 2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius.

[0164] The other steps and parameters are the same as those in Specific Embodiments 1 to 8.

[0165] Specific implementation method ten: This implementation method is different from any one of specific implementation methods one to nine in that, in step six, the two-dimensional parameter equations of each interactive area of ​​the hand accessibility of the automobile central control screen are derived based on step five, thus completing the division of the interactive area of ​​the difficulty of operation of the automobile central control screen;

[0166] The specific process is:

[0167] According to the external size, tilt angle, spatial placement and resolution of the car's central control screen and the hand-reachable activity radius, proceed to step 61 to step 62:

[0168] Step 61: Derive the conversion formula between the two-dimensional coordinate system of the car's central control screen and the three-dimensional coordinate system of the cockpit space; the specific process is:

[0169] Taking the upper left vertex of the car's central control screen as the origin, the length of the central control screen corresponds to the coordinate system i Coordinate axis, the width of the central control screen corresponds to the coordinate system j Coordinate axis, according to the length and width of the car's central control screen, a two-dimensional coordinate system is established. Figure 6 As shown;

[0170]

[0171] In the formula, m , n They are the length and width resolutions of the car’s central control screen;

[0172] b 0. c 0 are the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space. y , z Coordinate values ​​on the direction axis;

[0173] l is the length of the central control screen. h is the width of the central control screen. The tilt angle of the central control screen;

[0174] Step 62: Derive the two-dimensional parameter equation of the central control screen interaction area; the specific process is:

[0175] According to the conversion formula between the two-dimensional coordinate system of the central control screen and the three-dimensional coordinate system of the cockpit and the three-dimensional parameter equation of the interactive area of ​​the central control screen, the two-dimensional parameter equation of each interactive area of ​​the central control screen is derived;

[0176] The two-dimensional parameter equation of the optimal interactive area for hand accessibility of the central control screen:

[0177]

[0178] The two-dimensional parameter equation of the touchable area of ​​the central control screen is:

[0179]

[0180] The two-dimensional parameter equation of the worst interactive area of ​​the central control screen:

[0181]

[0182] In the formula, a 0. b 0. c 0 are the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space. x , y , z Coordinate values ​​on the direction axis;

[0183] a 1. b 1. c 1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back;

[0184] R 0. R 1. R 2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius.

[0185] The other steps and parameters are the same as those in Specific Embodiments 1 to 9.

[0186] The present invention may also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for dividing the area of ​​a central control screen of an automobile based on the accessibility of a driver's hand, characterized in that: The specific process of the method is: Step 1: Establish a three-dimensional coordinate system of the car cockpit space; Step 2: Determine the comfort angle range of each part of the driver's arm; Step 3: Select a human body size design reference standard, and calculate the three-dimensional position range of the driver's right shoulder point in the three-dimensional coordinate system of the cockpit space based on steps 1 and 2; Step 4: Calculate the arm's comfortable activity radius and touchable activity radius based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm; Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii; Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated; Step 5: Calculate the parameter equations of each interactive area of ​​the car's central control screen's hand accessibility based on step 4; Step 6: Based on step 5, derive the two-dimensional parameter equations of each interactive area of ​​the car's central control screen's hand accessibility.

2. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 1 is characterized in that: In the step 1, a three-dimensional coordinate system of the vehicle cockpit space is established; the specific process is as follows: The cockpit space coordinate system is established with the center point of the steering wheel as the origin of the three-dimensional coordinate system of the cockpit space, the front and rear horizontal plane direction from the front to the rear of the vehicle as the x-axis direction of the coordinate system, the left and right horizontal planes as the y-axis direction of the coordinate system, and the vertical xy plane as the z-axis direction of the coordinate system.

3. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 2 is characterized in that: In the step 2, the comfort angle range of each part of the driver's arm is determined; The specific process is: When the driver maintains the driving posture, the comfort angle range of each joint of the driver's arm includes: The comfortable angle range of the angle α1 between the driver's shoulder and the plumb plane; The comfortable angle range of the angle α2 between the driver's upper arm and the plumb line; The comfortable angle range of the angle α3 between the driver’s forearm and upper arm; The comfortable angle range of the angle α4 between the driver's hand and the forearm.

4. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 3 is characterized in that: The comfortable angle range of the angle α1 of the driver's shoulder relative to the plumb plane is 20 to 30°; The comfortable angle range of the angle α2 between the driver's upper arm and the plumb line is 10 to 45°; The comfortable angle range of the angle α3 between the driver's forearm and the upper arm is 80 to 120°; The comfortable angle range of the angle α4 between the driver's hand and the forearm is 170 to 190 degrees.

5. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 4 is characterized in that: In the step 3, a human body size design reference standard is selected, and the three-dimensional position range of the driver's right shoulder point in the three-dimensional coordinate system of the cockpit space is calculated based on the steps 1 and 2; The specific process is: Step 31: Select the reference standard for human body size design; the specific process is: The fifth quantile of static human body size of Chinese adult males was selected as the design reference; Step 32: Calculate the x, y, and z axis position range of the driver's right shoulder point; the specific process is: Step 321: Calculate the y-axis position range of the driver's right shoulder point: Where, d y is the horizontal distance from the driver’s right shoulder to the center of the steering wheel, w s5 is the shoulder width corresponding to the fifth quantile of static human body size of Chinese adult males, w s95 The shoulder width corresponding to the 95th percentile of static body size of Chinese adult males; Step 232: Calculate the x-axis position range of the driver's right shoulder point: The x-axis position range of the driver's right shoulder point is composed of the maximum distance from the driver's right shoulder point to the center point of the steering wheel in the front-rear horizontal plane and the minimum distance from the driver's right shoulder point to the steering wheel in the front-rear horizontal plane; Calculate the maximum horizontal distance from the driver's right shoulder point to the center of the steering wheel: d xmax ＝l1+l2+l3-50 Where, d xmax is the maximum distance between the driver's right shoulder and the center of the steering wheel in the front and rear horizontal plane, l1, l2, and l3 are the upper arm length, forearm length, and hand length corresponding to the 5th quantile of the static body size of Chinese adult males, respectively; Calculate the minimum distance between the driver's right shoulder point and the front and rear horizontal plane of the steering wheel: d xmin =l1×sin10°+(l2-l3×cos180°)×sin(80°-10°)-50 Where, d xmin is the minimum distance between the driver's right shoulder and the center of the steering wheel in the front and rear horizontal plane, l1, l2, l3 are the upper arm length, forearm length and hand length corresponding to the 5th quantile of the static body size of Chinese adult males, respectively; Step 233: Calculate the z-axis position range of the driver's right shoulder point: The z-axis position range of the driver's right shoulder point is composed of the maximum vertical distance from the driver's right shoulder point to the center point of the steering wheel and the minimum vertical distance from the driver's right shoulder point to the center point of the steering wheel; Calculate the maximum vertical distance from the driver's right shoulder point to the center point of the steering wheel: <h2 style=";text-align:left;direction:ltr">d<h2 style=";text-align:left;direction:ltr"> zmax <h2 style=";text-align:left;direction:ltr"> =H30<h2 style=";text-align:left;direction:ltr"> max <h2 style=";text-align:left;direction:ltr"> +(a1′-a2)h′-H17<h2 style=";text-align:left;direction:ltr"> min Where, d zmax H30 is the maximum vertical distance from the driver’s right shoulder to the center of the steering wheel. max is the maximum empirical value of the height from the driver's seat reference point to the accelerator pedal heel point, a1′ and a2 are the ratios of the height from the shoulder to the sole of the foot to the height of the standing Chinese adult male and the ratio of the height from the hip joint to the sole of the foot to the height of the standing Chinese adult male, h′ is the height corresponding to the 5th quantile of the static human body size of the Chinese adult male, H17 min It is the minimum empirical value of the vertical distance from the center of the steering wheel to the heel point of the accelerator pedal; Calculate the minimum vertical distance from the driver's right shoulder point to the center point of the steering wheel: <h2 style=";text-align:left;direction:ltr">d<h2 style=";text-align:left;direction:ltr"> zmin <h2 style=";text-align:left;direction:ltr"> =H30<h2 style=";text-align:left;direction:ltr"> min <h2 style=";text-align:left;direction:ltr"> +(a1′-a2)h′-H17<h2 style=";text-align:left;direction:ltr"> max Where, d zmin H30 is the minimum vertical distance from the driver's right shoulder point to the center of the steering wheel. min H17 is the minimum empirical value of the height from the driver's seat reference point to the accelerator pedal heel point. max It is the maximum empirical value of the vertical distance from the center of the steering wheel to the heel of the accelerator pedal.

6. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 5 is characterized in that: In the step 4, based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm, the arm comfort activity radius and the touchable activity radius are calculated; Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii; Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated; The specific process is: Step 41: Based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm, calculate the arm's comfortable activity radius and touchable activity radius; the specific process is: Step 4.

1. Based on the human body size design reference standard, the three-dimensional position range of the driver's right shoulder point in the cockpit space coordinate system, and the comfort angle range of each part of the driver's arm, calculate the arm comfort activity radius: Where R0 and R1 are the minimum and maximum values ​​of the arm's comfortable activity radius, respectively; l1, l2, and l3 are the upper arm length, forearm length, and hand length corresponding to the fifth quantile of the static body size of Chinese adult males, respectively; Step 4-2: Calculate the arm's touchable radius: R2＝l1+l2+l3 Where R2 is the touchable radius of the arm, l1, l2, and l3 are the upper arm length, forearm length, and hand length corresponding to the 5th quantile of the static body size of Chinese adult males, respectively; Step 42: Based on the arm's comfortable activity radius and touchable activity radius, calculate the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii; Step 43: Based on the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii, calculate the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space.

7. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 6 is characterized in that: In the step 42, based on the arm's comfortable activity radius and the touchable activity radius, the central control screen parameter equation and the spherical parameter equation corresponding to different arm activity radii are calculated; the specific process is: Step 421: Calculate the central control screen parameter equation; the specific process is: Assume that in the cockpit space three-dimensional coordinate system, the length of the central control screen is l, the height is h, the inclination angle of the central control screen is β, the three-dimensional coordinates of the center point P of the central control screen are P(a0, b0, c0), and the three-dimensional coordinates of the upper left vertex M of the central control screen are The three-dimensional coordinates of the upper right vertex N of the central control screen are Get two non-collinear vectors on the central control screen Assume that the normal vector of the central control screen in the three-dimensional coordinate system of the cockpit space is i, j, k represent the unit vectors along the x-axis, y-axis, and z-axis in the three-dimensional coordinate system of the cockpit space, respectively; According to the perpendicularity between the central control screen vector and the normal vector, we get: Thus we get: cosβ×i+sinβ×k=0 Center console screen normal vector The three-dimensional coordinates of the center point P of the central control screen are P(a0, b0, c0) and the normal vector of the central control screen is Substituting the point formula equation of the spatial plane in the spatial rectangular coordinate system into A(x′-x′0)+B(y′-y′0)+C(z′-z′0)=0, the parameter equation of the central control screen is obtained as follows: (x-a0)×cosβ+(z-c0)×sinβ=0 in, Among them, (x′, y′, z′) is the coordinate of any point on the spatial plane in the spatial rectangular coordinate system; (x′0, y′0, z′0) are the coordinates of a known point on the spatial plane in the spatial rectangular coordinate system, and A, B, and C correspond to the three-axis coordinates of the normal vector of the spatial plane in the spatial rectangular coordinate system; (x, y, z) are the three-axis coordinates in the three-dimensional coordinate system of the cockpit space; Step 422: Calculate the spherical parameter equation corresponding to different arm activity radii; the specific process is: The spherical parameter equation corresponding to the minimum value of the arm's comfortable activity radius is: Spherical parameter equation corresponding to the maximum value of the arm's comfortable activity radius: The spherical parameter equation corresponding to the arm's touchable activity radius: Where a1, b1, and c1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back in the three-dimensional coordinate system of the cockpit space; R0, R1, and R2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius in the three-dimensional coordinate system of the cockpit space, respectively.

8. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 7 is characterized in that: In the step 43, based on the central control screen parameter equation and the spherical parameter equations corresponding to different arm activity radii, the parameter equation of the arm activity radius in the three-dimensional coordinate system of the cockpit space is calculated; The specific process is: Step 431: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the minimum arm comfortable activity radius of step 422, calculate the parameter equation of the minimum arm comfortable activity radius in the three-dimensional coordinate system of the cockpit space: in Step 432: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the maximum arm comfortable activity radius of step 422, calculate the parameter equation of the maximum arm comfortable activity radius in the three-dimensional coordinate system of the cockpit space: in Step 433: Based on the central control screen parameter equation of step 421 and the spherical parameter equation corresponding to the arm touchable activity radius of step 422, calculate the parameter equation of the arm touchable activity radius in the three-dimensional coordinate system of the cockpit space: in Where a1, b1, and c1 are the three-dimensional coordinates of the position of the driver's right shoulder resting on the seat back in the three-dimensional coordinate system of the cockpit space; a0 and c0 are the x-axis and z-axis coordinates of the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space; β is the inclination angle of the central control screen, and R0, R1, and R2 are the minimum and maximum values ​​of the arm's comfortable activity radius and the arm's touchable activity radius, respectively.

9. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 8 is characterized in that: In the step 5, the parameter equations of each interactive area of ​​the hand accessibility of the automobile central control screen are calculated based on the step 4; the specific process is: Optimal interaction zone parameter equation: in Parametric equations of the touchable area: in Worst interaction zone parameter equation: in Where a1, b1, and c1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back in the three-dimensional coordinate system of the cockpit space; a0 and c0 are the x-axis and z-axis coordinates of the center point of the car's central control screen in the three-dimensional coordinate system of the cockpit space; β is the tilt angle of the central control screen; R0, R1, and R2 are the minimum and maximum values ​​of the arm's comfortable range of motion and the arm's touchable range of motion, respectively.

10. The method for dividing the area of ​​the automobile central control screen based on the driver's hand accessibility according to claim 9, characterized in that: In step 6, the two-dimensional parameter equations of each interactive area of ​​the hand accessibility of the automobile central control screen are derived based on step 5; the specific process is: Step 61: Derive the conversion formula between the two-dimensional coordinate system of the car's central control screen and the three-dimensional coordinate system of the cockpit space; the specific process is: Taking the upper left vertex of the car's central control screen as the origin, the length of the central control screen corresponds to the x-axis of the coordinate system, and the width of the central control screen corresponds to the y-axis of the coordinate system. A two-dimensional coordinate system is established according to the pixel points arranged according to the length and width of the car's central control screen. In the formula, m and n are the length and width resolutions of the car's central control screen respectively; b0 and c0 are the coordinate values ​​of the center point of the car's central control screen on the y and z axes in the three-dimensional coordinate system of the cockpit space, respectively; l is the length of the central control screen, h is the height of the central control screen, and β is the tilt angle of the central control screen; Step 62: Derive the two-dimensional parameter equation of the central control screen interaction area; the specific process is: The two-dimensional parameter equation of the optimal interactive area for hand accessibility of the central control screen: The two-dimensional parameter equation of the touchable area of ​​the central control screen is: The two-dimensional parameter equation of the worst interactive area of ​​the central control screen: Where a0, b0, and c0 are the coordinate values ​​of the center point of the car's central control screen on the x, y, and z axes in the three-dimensional coordinate system of the cockpit space, respectively; a1, b1, and c1 are the three-dimensional coordinates of the position where the driver's right shoulder rests on the seat back; R0, R1, and R2 are the minimum and maximum values ​​of the arm's comfortable range of motion and the arm's touchable range of motion, respectively.

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