Vehicle body descending speed calculation method and system and vehicle pedestrian protection system and method

Abstract

The invention discloses a vehicle body descending speed calculation method and system and a vehicle pedestrian protection system and method. Comprising the steps that according to the horizontal distance from a leg collision point to a head collision point when a pedestrian collides with a vehicle, the distance of the pedestrian attached to a front envelope of a vehicle body and the relative speed of the pedestrian and the vehicle during collision, the vertical component speed of the relative speed is obtained; the descending speed of the vehicle body is determined according to the vertical component speed; an automatic deflation system of the vehicle is started, so that the vehicle is deflated at the vehicle body descending speed; the body height and the tire rigidity are reduced through an active inflation and deflation system arranged on the vehicle, and the pedestrian protection performance is improved while the design rigidity of the vehicle is considered; compared with other high-cost schemes with buffer airbags and active cabin covers, the system has the advantages that extra cost is not increased, and the integration level is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of pedestrian protection, and in particular relates to a vehicle body descent speed calculation method and system, and a vehicle pedestrian protection system and method. Background Art

[0002] The current vehicle pedestrian protection test requires marking test points at locations such as the hood, fenders, A-pillars, and front windshield. A human head model is then used to impact each test point at a certain speed, and the pedestrian protection performance is evaluated by obtaining the acceleration of the head. The pedestrian protection performance score will affect the vehicle's safety rating.

[0003] In order to meet the requirements of pedestrian protection performance, the test point is generally required to have a small stiffness and sufficient deformation space under the test point. Due to the vehicle structure and shape, the stiffness of the engine cover lock, the hinges on both sides of the engine cover, the A-pillar and other areas is relatively large, resulting in low scores for the test points in these areas, which is very harmful to the pedestrian's head. This is the difficulty in vehicle optimization at present. Summary of the invention

[0004] In order to achieve a balance between vehicle rigidity and vehicle safety rating, the present invention proposes a vehicle body descent speed calculation method and system, and a vehicle pedestrian protection system and method.

[0005] A vehicle body descent speed calculation system for achieving one of the objectives of the present invention comprises:

[0006] Vertical speed calculation unit: used to obtain the vertical component of the relative speed according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs; that is, the vertical downward component of the relative speed perpendicular to the horizontal plane;

[0007] The vehicle body descending speed calculation unit is used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed.

[0008] Furthermore, in the vertical speed calculation unit, the method for calculating the vertical component speed of the relative speed includes:

[0009] According to the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, the rotation angle of the pedestrian when the pedestrian starts to move in a circular motion from an upright position toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius;

[0010] Draw a tangent line of the circular motion through the head collision point, and draw a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle;

[0011] According to the included angle and the relative speed between the pedestrian and the vehicle at the time of collision, the vertical component speed of the relative speed is obtained.

[0012] Furthermore, the calculation method of the rotation angle includes:

[0013] θ=arcsin(L / H1)

[0014] Where: L and H1 are the horizontal distance from the leg collision point to the head collision point when the pedestrian collides with the vehicle and the distance that the pedestrian fits within the front envelope of the vehicle body.

[0015] Furthermore, the method for calculating the vertical component of the relative speed includes:

[0016] V 头下 =V 头 ×cos(90°-θ)

[0017] V 头下 Indicates the vertical component of the relative speed between the pedestrian and the vehicle at the time of collision;

[0018] V 头 Indicates the relative speed between the pedestrian and the vehicle at the time of collision;

[0019] θ represents the rotation angle.

[0020] Furthermore, the method for determining the descending speed of the vehicle body according to the vertical component speed of the relative speed includes: the product of the vertical component speed and the set weight is the descending speed of the vehicle body.

[0021] A method for calculating the vehicle body descent speed to achieve the second objective of the present invention includes:

[0022] The vertical component of the relative speed is obtained according to the horizontal distance from the collision point of the legs of the pedestrian to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs;

[0023] The descending speed of the vehicle body is determined according to the vertical component speed of the relative speed.

[0024] A vehicle pedestrian protection system to achieve the third objective of the present invention comprises:

[0025] Vertical speed calculation unit: used to obtain the vertical component of the relative speed, i.e., the vertical downward component perpendicular to the horizontal plane, according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs;

[0026] A vehicle body descending speed calculation unit: used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed;

[0027] Vehicle deflation unit: used to start the automatic deflation system of the vehicle, so that the vehicle is deflated at a speed at which the vehicle body descends.

[0028] The technical effect of the above system is: the vehicle body is lowered by deflating the vehicle, so that the stiffness of the vehicle at the impact site is reduced, the collision contact impact is alleviated, and a better protective effect is provided for pedestrians whose heads impact the vehicle; experimental data confirms that by simulating the impact through a human head model, the method of the present invention can reduce the damage value from 1500 to 1400.

[0029] In the above system, a collision sensor is provided on the front bumper, which can sense the collision moment of the pedestrian; the height of the pedestrian is obtained through an image collector, such as a camera, a laser radar, etc.

[0030] In the above system, the vertical speed calculation unit includes:

[0031] A first angle calculation unit is used to obtain, based on the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, the rotation angle of the pedestrian when the pedestrian starts to move in a circular motion from an upright position toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius;

[0032] A second angle calculation unit is used to make a tangent line of the circular motion through the head collision point and a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle;

[0033] A vertical component velocity calculation unit is used to obtain the vertical component velocity of the relative velocity according to the angle and the relative velocity between the pedestrian and the vehicle at the time of collision.

[0034] The product of the vertical component velocity and the set weight is the speed at which the vehicle body descends, and the set weight is a positive number less than 1. The technical effect of this step is that when the vertical component velocity is much greater than the speed at which the vehicle body descends, or when the speed at which the vehicle body descends is much greater than the vertical component velocity, there will be no protection and buffering effect, so a weight needs to be set so that the vertical component velocity is slightly less than the speed at which the vehicle body descends, thereby providing a reasonable buffer for pedestrians.

[0035] Furthermore, the set weight is a positive number less than 1, and the preferred range is [0.4, 0.6].

[0036] Furthermore, the calculation method of the rotation angle includes:

[0037] θ=arcsin(L / H1)

[0038] Where: L and H1 are the horizontal distance from the leg collision point to the head collision point when the pedestrian collides with the vehicle and the distance that the pedestrian fits within the front envelope of the vehicle body.

[0039] Furthermore, it also includes judging the speed of the vehicle, and a speed judging unit is used to judge whether the speed of the vehicle is within a set range; when the speed is within the set range, the vehicle is triggered to start the vehicle pedestrian protection system.

[0040] A vehicle pedestrian protection method for achieving the fourth objective of the present invention comprises:

[0041] According to the horizontal distance from the collision point of the legs of the pedestrian to the collision point of the head when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs, the vertical component of the relative speed is obtained; that is, the vertical downward component of the relative speed perpendicular to the horizontal plane;

[0042] determining the descending speed of the vehicle body according to the vertical component speed;

[0043] The automatic deflation system of the vehicle is started to deflate the vehicle at a speed at which the vehicle body descends.

[0044] Further, the method for obtaining the vertical component velocity of the relative velocity includes:

[0045] According to the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, the rotation angle of the pedestrian when the pedestrian starts to move in a circular motion from an upright position toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius;

[0046] Draw a tangent line of the circular motion through the head collision point, and draw a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle;

[0047] According to the angle and the relative speed between the pedestrian and the vehicle at the time of collision, the vertical component speed of the relative speed is obtained; the product of the vertical component speed and the set weight is the descending speed of the vehicle body.

[0048] Furthermore, it also includes a vehicle speed judgment unit, which is used to judge whether the vehicle speed is within a set range. When the vehicle speed is within the set range, the vehicle is triggered to start the vehicle pedestrian protection method.

[0049] The beneficial effects of the present invention include:

[0050] 1. By accurately measuring and calculating key parameters during the collision process, the vehicle body's descent speed at the moment of collision is effectively calculated, providing scores for subsequent vehicle safety performance evaluations;

[0051] 2. The present invention utilizes the active inflation and deflation system of the vehicle to reduce the body height and tire stiffness, thereby improving the pedestrian protection performance while taking into account the vehicle design stiffness. Compared with other high-cost solutions such as adding cushioning airbags and using active engine covers, the present invention has the advantages of no additional cost and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a schematic diagram of a flow chart of an embodiment of the method of the present invention;

[0053] Figure 2 This is one of the schematic diagrams of a vehicle hitting a pedestrian;

[0054] Figure 3 This is the second schematic diagram of a vehicle colliding with a pedestrian;

[0055] Figure 4 It is a schematic diagram of pedestrian protection without active deflation protection and with active deflation protection. DETAILED DESCRIPTION

[0056] The following specific implementations are used to explain the technical solutions of the claims of the present invention so that those skilled in the art can understand the claims. The protection scope of the present invention is not limited to the following specific implementation structures. The technical solutions of the claims of the present invention made by those skilled in the art but different from the following specific implementations are also within the protection scope of the present invention.

[0057] In the present invention, the technology of automatic inflation and deflation of vehicles mainly refers to the central tire inflation and deflation system (CIDC) and the central tire inflation system (CTIS). When a pedestrian collision is detected, the vehicle's front wheels are deflated through the vehicle's automatic deflation system, causing the tire pressure to drop rapidly, and the vehicle height to drop along with the pedestrian's head, producing a buffering effect; at the same time, the rigidity of the tire is reduced, and the vehicle body will have a greater downward displacement after the pedestrian hits the vehicle. In this way, the collision measurement point meets the pedestrian protection requirements and improves the vehicle safety level.

[0058] Example 1

[0059] A vehicle pedestrian protection system, comprising:

[0060] Vertical speed calculation unit: used to obtain the vertical component of the relative speed according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs;

[0061] A vehicle body descending speed calculation unit: used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed;

[0062] Vehicle deflation unit: used to start the automatic deflation system of the vehicle, so that the vehicle is deflated at a speed at which the vehicle body descends.

[0063] like Figure 2 The figure shows a schematic diagram of a vehicle colliding with a pedestrian. The vehicle is equipped with an identification system (including ADAS, etc.), and a collision sensor is set on the front bumper, which can actively identify pedestrians, their heights, and whether they have collided with pedestrians. When there is a pedestrian in front, the height H of the pedestrian is obtained, and the collision point between the pedestrian's feet and the vehicle and the collision point between the pedestrian's head and the vehicle are determined according to the height of the vehicle. These are all existing technologies and will not be described in detail here.

[0064] The height from the foot impact point to the head impact point is H1;

[0065] According to the characteristics of the vehicle (shape and size), it can be known that the horizontal distance from the leg collision point to the head collision point is L; L = the distance detected by the camera (pedestrian height - leg collision point) fits within the front envelope of the vehicle body, and the head collision point is at the end of this fitting distance.

[0066] In the above system, the vertical speed calculation unit includes:

[0067] The first angle calculation unit is used to obtain the rotation angle θ of the pedestrian when the pedestrian starts to move in a circular motion from an upright position toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian sticking to the front envelope of the vehicle body as the radius according to the horizontal distance and the distance of the pedestrian sticking to the front envelope of the vehicle body, that is, sinθ=L / H1; θ=arcsin(L / H1);

[0068] The second angle calculation unit is used to make a tangent line of the circular motion through the head collision point and a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle, such as Figure 3 As shown, the head collision point is point A in the figure, the tangent line is straight line L1 in the figure, and the vertical line is straight line L2 perpendicular to the horizontal plane in the figure;

[0069] A vertical component velocity calculation unit is used to obtain the vertical component velocity of the relative velocity according to the angle and the relative velocity between the pedestrian and the vehicle at the time of collision.

[0070] Furthermore, when the pedestrian's head hits the vehicle, the relative speed between the pedestrian and the vehicle is V 头 , the vertical component of the relative velocity is V 头下 =V 头 ×cos(90°-θ).

[0071] V 车下 The speed at which the vehicle body lowers when the air is released.

[0072] When the pedestrian's downward velocity V 头下 Much greater than the speed V at which the vehicle body descends when the air is deflated 车下 When the vehicle is deflated, the speed at which the vehicle body descends is V 车下 Much greater than the vertical component velocity V of the relative velocity of the pedestrian and the vehicle that collided with it 头下 When V 车下 =(0.4~0.6)×V 头下 When V 车下 V 头下 When the head collision is 0.4 to 0.6 times of the vehicle's acceleration, a better head protection effect can be achieved. A head collision with active deflation protection has a larger buffer space and buffer time, thereby reducing the pedestrian's head collision acceleration. Figure 4 As shown, the left picture is a schematic diagram without active deflation protection. Compared with the pedestrian protection schematic diagram with active deflation protection in the right picture, the head collision with active deflation protection has a larger buffer space and buffer time, thereby reducing the acceleration of the pedestrian's head collision.

[0073] In some embodiments, a vehicle speed judgment unit is further included to judge whether the vehicle speed is within a set range, and when the vehicle speed is within the set range, the vehicle is triggered to start the vehicle pedestrian protection method. Because when the vehicle speed is too fast (for example, more than 60km / h) or too slow (for example, less than 20km / h), the deflation protection will not produce obvious effects. In this embodiment, the vehicle pedestrian protection method or system is triggered when the vehicle speed is 20km / h-60km / h.

[0074] At the same time, by obtaining the vehicle's location, it can be determined whether it is in an area where pedestrians appear, such as village roads, urban roads, etc. By obtaining the vehicle's location, it can be determined whether the vehicle is in an area where pedestrians appear (community, streets, villages) or an area where no pedestrians appear (highways, closed roads, wild roads, etc.).

[0075] Because the tire pressure of a vehicle is generally high, and the tire rubber has certain damping characteristics, it is impossible to lower the height of the vehicle immediately after the deflation is turned on. Therefore, when the pedestrian's foot hits the vehicle at time t0, the vehicle control system can start the automatic deflation system to reduce the tire pressure. When the head hits at time t1, the vehicle body has already reached a certain descending speed and reduced the rigidity of the tire, thereby reducing the impact of the pedestrian's collision.

[0076] Example 2

[0077] A vehicle pedestrian protection method, comprising:

[0078] like Figure 2As shown, according to the horizontal distance L from the leg collision point to the head collision point when the pedestrian collides with the vehicle, the distance H1 that the pedestrian fits in the front envelope of the vehicle body, and the relative speed V between the pedestrian and the vehicle when the collision occurs, 头 Get the vertical component velocity V of the relative velocity 头下 ;

[0079] According to the vertical velocity V 头下 Determine the speed V at which the vehicle body descends 车下 ;

[0080] The vehicle's automatic deflation system is activated to lower the vehicle at the speed V 车下 Deflate the vehicle.

[0081] In some embodiments, the vertical component velocity V of the relative velocity is obtained. 车下 Methods such as Figure 2 As shown, including:

[0082] According to the horizontal distance L and the distance H1 of the pedestrian attached to the front of the vehicle body, the rotation angle θ of the pedestrian when making a circular motion toward the vehicle with the leg collision point as the center, the vertical direction as the starting point, and the distance H1 of the pedestrian attached to the front of the vehicle body as the radius;

[0083] like Figure 3 As shown, a tangent line L1 of the circular motion is drawn through the head collision point A, and a vertical line L2 is drawn through the head collision point A; the included angle between the vertical line L2 and the tangent line L1 is obtained according to the rotation angle θ; the angle of the included angle is 90°-θ;

[0084] According to the angle, the relative speed between the pedestrian and the vehicle at the time of collision, the vertical component velocity V of the relative speed is obtained. 头下 ;

[0085] The product of the vertical component velocity and the set weight is the descending speed of the vehicle body.

[0086] In some embodiments, the method for calculating the rotation angle includes:

[0087] θ=arcsin(L / H1)

[0088] Where: L and H1 are the horizontal distance from the leg collision point to the head collision point when the pedestrian collides with the vehicle and the distance that the pedestrian fits within the front envelope of the vehicle body.

[0089] In some embodiments, the vertical component of the relative velocity V 头下 The calculation methods include: V 头下 =V 头 ×cos(90°-θ).

[0090] In some embodiments, the speed V at which the vehicle body descends 车下 The calculation methods include: V 车下 =V 头下 ×α; α is the set weight.

[0091] When the vertical speed V 头下 Much greater than the speed V at which the vehicle body descends when the air is deflated 车下 When the vehicle is deflated, the speed at which the vehicle body descends is V 车下 Much larger than the pedestrian's downward velocity V 头下 When , it will not play a protective and buffering role, so the weight α is set to a positive number less than 1, and the preferred range is [0.4, 0.6].

[0092] In some embodiments, it also includes judging the speed of the vehicle, and triggering the vehicle to start the vehicle pedestrian protection method when the speed is within a set range, so that the method can be maximized. Because when the speed is too fast or too slow, the deflation protection will not produce obvious effect. In this embodiment, the set range is [20km / h, 60km / h].

[0093] Example 3

[0094] A vehicle body descending speed calculation system, comprising:

[0095] Vertical speed calculation unit: used to obtain the vertical component of the relative speed according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs;

[0096] The vehicle body descending speed calculation unit is used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed.

[0097] In some embodiments, the vertical speed calculation unit includes:

[0098] A first angle calculation unit is used to obtain, based on the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, the rotation angle of the pedestrian when the pedestrian starts to move in a circular motion from an upright position toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius;

[0099] A second angle calculation unit is used to make a tangent line of the circular motion through the head collision point and a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle;

[0100] A vertical component velocity calculation unit is used to obtain the vertical component velocity of the relative velocity according to the angle and the relative velocity between the pedestrian and the vehicle at the time of collision.

[0101] In some embodiments, the method for calculating the rotation angle includes:

[0102] θ=arcsin(L / H1)

[0103] Where: L and H1 are the horizontal distance from the leg collision point to the head collision point when the pedestrian collides with the vehicle and the distance that the pedestrian fits within the front envelope of the vehicle body.

[0104] In some embodiments, the method for calculating the vertical component of the relative speed includes:

[0105] V 头下 =V 头 ×cos(90°-θ)

[0106] V 头下 Indicates the vertical component of the relative speed between the pedestrian and the vehicle at the time of collision;

[0107] V 头 Indicates the relative speed between the pedestrian and the vehicle at the time of collision;

[0108] θ represents the rotation angle.

[0109] In some embodiments, the product of the vertical component velocity and the set weight is the descending speed of the vehicle body.

[0110] Example 4

[0111] A method for calculating a vehicle body descending speed, comprising:

[0112] The vertical component of the relative speed is obtained according to the horizontal distance from the collision point of the legs of the pedestrian to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs;

[0113] The descending speed of the vehicle body is determined according to the vertical component speed of the relative speed.

[0114] Example 5

[0115] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. The computer program includes program instructions. When the program instructions are executed by a processor, the steps of the method described in the present invention are implemented, which will not be repeated here.

[0116] The computer-readable storage medium may be the data transmission device provided in any of the aforementioned embodiments or the internal storage unit of the computer device, such as the hard disk or memory of the computer device. The computer-readable storage medium may also be an external storage device of the computer device, such as a plug-in hard disk, a smart memory card (smartmedia card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc., provided on the computer device.

[0117] Furthermore, the computer-readable storage medium may include both an internal storage unit of the computer device and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the computer device. The computer-readable storage medium may also be used to temporarily store data to be output or has been output.

[0118] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0119] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0120] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0122] Example 6

[0123] A computer program product comprises a computer program / instruction, wherein when the computer program / instruction is executed by a processor, any step of the vehicle pedestrian protection method is implemented.

[0124] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A vehicle body descending speed calculation system, characterized in that: include: Vertical speed calculation unit: used to obtain the vertical component of the relative speed according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs; The vehicle body descending speed calculation unit is used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed.

2. A method for calculating the vehicle body descent speed, characterized in that: include: The vertical component of the relative speed is obtained according to the horizontal distance from the collision point of the legs of the pedestrian to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs; The descending speed of the vehicle body is determined according to the vertical component speed of the relative speed.

3. A vehicle pedestrian protection system, characterized in that: include: Vertical speed calculation unit: used to obtain the vertical component of the relative speed according to the horizontal distance from the collision point of the legs to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs; A vehicle body descending speed calculation unit: used to determine the descending speed of the vehicle body according to the vertical component speed of the relative speed; Vehicle deflation unit: used to start the automatic deflation system of the vehicle, so that the vehicle is deflated at a speed at which the vehicle body descends.

4. The vehicle pedestrian protection system according to claim 3, characterized in that: The vertical speed calculation unit includes: A first angle calculation unit is used to obtain, based on the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, a rotation angle of the pedestrian when the pedestrian makes a circular motion from the upright face of the pedestrian toward the vehicle direction with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius; A second angle calculation unit is used to make a tangent line of the circular motion through the head collision point and a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle; A vertical component velocity calculation unit is used to obtain the vertical component velocity of the relative velocity according to the angle and the relative velocity between the pedestrian and the vehicle at the time of collision.

5. The vehicle pedestrian protection system according to claim 4, characterized in that: The calculation method of the rotation angle includes: θ=arcsin(L / H1) Where: L and H1 are the horizontal distance from the leg collision point to the head collision point when the pedestrian collides with the vehicle and the distance that the pedestrian fits within the front envelope of the vehicle body.

6. The vehicle pedestrian protection system according to claim 4, characterized in that: The method for calculating the vertical component of the relative speed includes: V 头下 =V 头 ×cos(90°-θ) V 头下 Indicates the vertical component of the relative speed between the pedestrian and the vehicle at the time of collision; V 头 Indicates the relative speed between the pedestrian and the vehicle at the time of collision; θ represents the rotation angle.

7. The vehicle pedestrian protection system according to any one of claims 3 to 6, characterized in that: The product of the vertical component velocity and the set weight is the descending speed of the vehicle body.

8. The vehicle pedestrian protection system according to claim 1, characterized in that: It also includes a vehicle speed judgment unit, which is used to judge whether the vehicle speed is within a set range; when the vehicle speed is within the set range, the vehicle is triggered to start the vehicle pedestrian protection system.

9. A vehicle pedestrian protection method, characterized in that: include: The vertical component of the relative speed is obtained according to the horizontal distance from the collision point of the legs of the pedestrian to the collision point of the head of the pedestrian when the pedestrian collides with the vehicle, the distance of the pedestrian in contact with the front envelope of the vehicle body, and the relative speed of the pedestrian and the vehicle when the collision occurs; determining the descending speed of the vehicle body according to the vertical component speed; The automatic deflation system of the vehicle is started to deflate the vehicle at a speed at which the vehicle body descends.

10. The vehicle pedestrian protection method according to claim 9, characterized in that: The method for obtaining the vertical component velocity of the relative velocity includes: According to the horizontal distance and the distance of the pedestrian attached to the front envelope of the vehicle body, the rotation angle of the pedestrian when starting from an upright position to the vehicle direction to make a circular motion with the leg collision point as the center and the distance of the pedestrian attached to the front envelope of the vehicle body as the radius is obtained; Draw a tangent line of the circular motion through the head collision point, and draw a vertical line through the head collision point; and obtain the angle between the vertical line and the tangent line according to the rotation angle; According to the included angle and the relative speed between the pedestrian and the vehicle at the time of collision, the vertical component speed of the relative speed is obtained.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the vehicle pedestrian protection method according to any one of claims 9 to 10 are implemented.

12. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, any step of the vehicle pedestrian protection method described in claims 9 to 10 is implemented.

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