Deployment control method and system for pedestrian airbag in vehicle

Abstract

Provided are a deployment control method and system for a pedestrian airbag (222) in a vehicle. The deployment control method comprises: by means of a collection module, collecting height information of a pedestrian in front of a vehicle and movement information of the pedestrian in front of the vehicle in a horizontal plane coordinate system of the vehicle, and sending the collected height information and movement information to a processing module; using the processing module to determine, on the basis of pre-stored vehicle parameter information and the received height information and movement information, whether the vehicle is to collide with the pedestrian in front, and when it is determined that the vehicle is to collide with the pedestrian in front, in view of a pre-stored first mapping relationship, performing calculation to obtain first horizontal coordinate information, in the horizontal plane coordinate system, of an impact point of the head of the collided pedestrian on the vehicle; using the processing module to perform calculation, so as to obtain target angle information of an airbag unit (2); and using a control module to control a planar rotation mechanism (21) to drive an airbag mechanism (22) to rotate in a horizontal plane, such that the deployment direction becomes a target deployment direction, and then deploying an airbag (222).

Description

A method and system for controlling the deployment of pedestrian airbags in a vehicle. Cross-reference to related applications

[0001] This application claims priority to Chinese patent application No. 202411181183.1, filed on August 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of vehicle safety engineering technology, specifically relating to a method and system for controlling the deployment of pedestrian airbags in a vehicle. Background Technology

[0003] Currently, technological sophistication, low wind resistance, and lightweight design are the development trends for electric vehicles. However, these trends, such as front continuous lights, low-slung hoods, and aluminum hoods, pose greater challenges to pedestrian head impact protection. Pedestrian head impact protection optimization falls into three categories: first, optimizing the vehicle's structural design; second, installing an active hood; and third, installing a pedestrian airbag system on the vehicle's hood exterior. Among these, optimizing the vehicle's structural design is often difficult due to its shape and layout. Currently, most active hoods on the market suffer from high costs, non-reusability, and a tendency to trigger accidentally. In contrast to the first two methods, pedestrian airbags provide more reliable secondary collision protection for injured pedestrians.

[0004] However, because each airbag in existing pedestrian airbag systems is usually a fixed structure with a single deployment direction, each airbag can only cover a fixed area, resulting in low utilization. Therefore, in order to ensure the secondary collision protection function of airbags, existing pedestrian airbags usually increase the number of airbags (simultaneously placing airbags on the vehicle hood, front bulkhead, and A-pillar) and their size to increase the airbag coverage, ensuring that the head of the pedestrian is covered as much as possible. This also results in existing pedestrian airbag systems typically having low airbag utilization and high installation and maintenance costs. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, this application provides a method and system for controlling the deployment of pedestrian airbags in vehicles, thereby solving the technical problems of low airbag utilization and high installation and maintenance costs that are common in existing pedestrian airbag systems.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] A method for controlling the deployment of a pedestrian airbag in a vehicle, the method comprising:

[0008] The acquisition module collects the height information of pedestrians in front of the vehicle and their movement information in the vehicle's horizontal coordinate system, and sends the collected height information and movement information to the processing module.

[0009] The processing module uses pre-stored vehicle parameter information and received movement information to determine whether the vehicle will collide with a pedestrian in front; and when it is determined that the vehicle will collide with a pedestrian in front, it calculates the first horizontal coordinate information of the point where the head of the pedestrian will land on the vehicle in the horizontal coordinate system based on the received height information, the movement information, and the pre-stored first mapping relationship.

[0010] The processing module calculates the target angle information of the airbag unit based on the pre-stored horizontal coordinate value of the rotation center of the airbag mechanism in the horizontal plane coordinate system and the calculated first horizontal coordinate information, and sends the target angle information to the control module; wherein, the airbag unit includes a planar rotation mechanism installed at the rear end of the upper side of the vehicle's hood outer panel, and an airbag mechanism fixedly installed on the output end of the planar rotation mechanism;

[0011] The control module controls the planar rotation mechanism to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane according to the received target angle information, and then controls the airbag mechanism to detonate the airbag.

[0012] The pedestrian airbag deployment control method for vehicles provided in this application utilizes a processing module to determine whether the vehicle will collide with a pedestrian in front. Upon determining that the vehicle will collide with a pedestrian, it calculates the first horizontal coordinate information of the point where the pedestrian's head will land on the vehicle in the horizontal coordinate system. Then, it calculates the target angle information of the airbag unit. Finally, based on the received target angle information, it controls the planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane to the target deployment direction before controlling the airbag mechanism to deploy. This method enables accurate control of the airbag mechanism's deployment direction in the horizontal plane by predicting the point where the pedestrian's head will land on the vehicle, effectively improving airbag utilization and reducing installation and maintenance costs. It solves the technical problems of low airbag utilization and high installation and maintenance costs commonly found in existing pedestrian airbag systems.

[0013] The pedestrians mentioned include people walking on the road and people riding two-wheeled vehicles.

[0014] Furthermore, the movement information includes a first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and a second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system.

[0015] The method for obtaining the first mapping relationship includes: conducting a pedestrian collision simulation test, simulating the predicted horizontal coordinate value of the pedestrian's head landing point on the vehicle when the front of the vehicle hits the pedestrian under different collision parameters, and obtaining the first mapping relationship based on the collision parameters and the predicted horizontal coordinate value; wherein, the collision parameters include the height information and the movement information.

[0016] By inputting different collision parameters (first relative velocity value, second relative velocity value, current horizontal coordinate value, and pedestrian's height value), the landing point of the pedestrian's head on the vehicle is simulated, and the corresponding predicted horizontal coordinate value is output, thus obtaining the first mapping relationship. Before the vehicle hits the pedestrian, the first horizontal coordinate information of the landing point of the pedestrian's head on the vehicle can be calculated using the first mapping relationship and the obtained collision parameters of the pedestrian, thereby predicting the landing point of the pedestrian's head on the vehicle in advance.

[0017] Furthermore, the processing module obtains the first relative velocity value, the second relative velocity value, the current horizontal coordinate value, and the pedestrian's height value based on the received height information and movement information;

[0018] The processing module obtains the corresponding predicted horizontal coordinate value based on the obtained first relative velocity value, second relative velocity value, current horizontal coordinate value, and height value, combined with the pre-stored first mapping relationship, and uses the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

[0019] Furthermore, the movement information includes a first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and a second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system.

[0020] The vehicle parameter information includes the vehicle body coordinate region parameters in the horizontal plane coordinate system.

[0021] The method by which the processing module determines whether a vehicle will collide with a pedestrian in front includes the following steps:

[0022] Step 1: The processing module performs calculations based on the received movement information and vehicle parameter information, and determines whether the vehicle will collide with the pedestrian in front based on the calculation results. If it is determined that the vehicle will collide with the pedestrian in front, proceed to Step 2; if it is determined that the vehicle will not collide with the pedestrian in front, repeat Step 1.

[0023] Step 2: The processing module calculates the first horizontal coordinate information of the landing point of the pedestrian's head on the vehicle in the horizontal coordinate system based on the received height information and movement information, as well as the pre-stored first mapping relationship.

[0024] The specific method for calculating whether a vehicle will collide with a pedestrian in front based on the first relative velocity value, the second relative velocity value, the current horizontal coordinate value, and the vehicle body coordinate area parameters is a conventional mathematical algorithm and common knowledge in this technical field. In principle, it only requires calculating and predicting the pedestrian's trajectory in the horizontal coordinate system based on the first relative velocity value, the second relative velocity value, and the current horizontal coordinate value (i.e., calculating and obtaining the pedestrian's movement function), and then determining whether the vehicle will collide with the pedestrian in front by judging whether the pedestrian's trajectory partially overlaps with the vehicle body area based on the trajectory and the vehicle body coordinate area parameters.

[0025] Furthermore, the movement information includes the relative distance between the pedestrian in front of the vehicle and the front of the vehicle in the longitudinal direction of the vehicle, the first relative velocity of the pedestrian in front of the vehicle in the lateral direction of the vehicle and the second relative velocity in the longitudinal direction of the vehicle, and the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system.

[0026] The vehicle parameter information includes the vehicle's braking deceleration value;

[0027] The system also collects the vehicle's current speed information through a data acquisition module and sends the collected current speed information to the processing module.

[0028] The method by which the processing module determines whether a vehicle will collide with a pedestrian in front includes the following steps:

[0029] Step 1: The processing module calculates the braking distance and braking time of the vehicle based on the vehicle parameter information and the current speed information;

[0030] Step 2: The processing module calculates the minimum safe braking distance between the vehicle and the pedestrian in front of the vehicle based on the calculated braking distance value, the braking time value, and the second relative speed value;

[0031] Step 3: The processing module makes a judgment based on the obtained minimum safe braking distance value and the relative distance value; if the relative distance value is less than the minimum safe braking distance value, it is determined that the vehicle will hit the pedestrian in front; if the relative distance value is not less than the minimum safe braking distance value, it is determined that the vehicle will not hit the pedestrian in front.

[0032] Furthermore, if the processing module determines that the vehicle will not collide with a pedestrian in front, the processing module sends emergency braking information to the control module, and the control module controls the vehicle's braking system to perform emergency braking based on the received emergency braking information.

[0033] Furthermore, the minimum safe braking distance value is calculated using the following formula:

[0034]

[0035] in, This is the minimum safe braking distance value; The braking distance value; The braking time value; This is the second relative velocity value.

[0036] Furthermore, the initial deployment direction of the airbag mechanism is set to the forward direction of the vehicle;

[0037] The control module uses the received target angle information to control the planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane from the initial detonation direction to the target detonation direction.

[0038] By setting the initial deployment direction of the airbag mechanism and setting the initial deployment direction of the airbag mechanism to the front direction of the vehicle, it is not only convenient to calibrate the rotation position of the planar rotation mechanism, but also to react more quickly when the vehicle hits a child (children are shorter, and when they are hit, their heads will land on the front of the vehicle and the front of the vehicle hood).

[0039] Furthermore, the X-axis of the horizontal coordinate system is set to be parallel to the front-rear direction of the vehicle, and the positive direction of the X-axis is set to the front direction of the vehicle. The Y-axis of the horizontal coordinate system is set to be parallel to the left-right direction of the vehicle.

[0040] By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis of the horizontal coordinate system to be parallel to the front-rear direction of the vehicle, setting the positive direction of the X-axis to the front direction of the vehicle, and setting the Y-axis of the horizontal coordinate system to be parallel to the left-right direction of the vehicle, the calculation of the first horizontal coordinate information can be simplified, and the calibration of the rotation position of the planar rotation mechanism can be further simplified.

[0041] According to the pedestrian airbag deployment control method for a vehicle provided in this application, this application also provides a pedestrian airbag deployment control system for a vehicle, including: a data acquisition module, a processing module and a control module installed on the vehicle, a planar rotation mechanism installed on the upper rear end of the vehicle's hood outer panel, and an airbag mechanism fixedly installed on the output end of the planar rotation mechanism.

[0042] Furthermore, the pedestrian airbag deployment control system of the vehicle also includes a decorative cover plate, which is fixedly installed on the upper rear end of the outer panel of the hood. The planar rotation mechanism and the airbag mechanism are both installed between the decorative cover plate and the outer panel of the hood. Attached Figure Description

[0043] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 is a state diagram of the airbag mechanism driven by the planar rotation mechanism in Embodiment 1, which rotates the detonation direction to the target detonation direction in the horizontal plane.

[0045] Figure 2 is a state diagram of the plane rotation mechanism driving the airbag mechanism in Embodiment 1 to rotate the detonation direction to the target detonation direction in the horizontal plane.

[0046] Figure 3 is a diagram showing the state of the airbag mechanism driven by the planar rotation mechanism in Embodiment 1, which rotates the detonation direction to the target detonation direction in the horizontal plane.

[0047] Figure 4 is a diagram showing the state of the airbag mechanism driven by the planar rotation mechanism in Embodiment 1, which rotates the detonation direction to the target detonation direction in the horizontal plane.

[0048] Figure 5 is a diagram showing the state of the airbag mechanism driven by the planar rotation mechanism in Embodiment 1, which rotates the detonation direction to the target detonation direction in the horizontal plane.

[0049] Figure 6 is a schematic diagram of the assembled exploded structure of the outer hood panel, planar rotation mechanism, airbag mechanism and decorative cover in Embodiment 2;

[0050] Figure 7 is a schematic diagram of the assembly structure of the planar rotation mechanism and the airbag mechanism in Embodiment 2.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1—Outer panel of the hood; 2—Airbag unit; 3—Decorative cover;

[0053] 21—Plane rotation mechanism; 22—Airbag mechanism;

[0054] 211—Servo motor, 212—Motor shaft;

[0055] 221—Gas generator, 222—Airbag, 223—Airbag support. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0057] Example 1:

[0058] As shown in Figures 1 to 5, Embodiment 1 provides a method for controlling the deployment of a pedestrian airbag in a vehicle. The method includes:

[0059] The acquisition module collects the height information of pedestrians in front of the vehicle and their movement information in the vehicle's horizontal coordinate system, and sends the collected height and movement information to the processing module.

[0060] The processing module uses pre-stored vehicle parameter information and received movement information to determine whether the vehicle will collide with the pedestrian in front; and when it is determined that the vehicle will collide with the pedestrian in front, it calculates the first horizontal coordinate information of the point where the head of the pedestrian hit will land on the vehicle in the horizontal coordinate system based on the received height information and movement information, as well as the pre-stored first mapping relationship.

[0061] The processing module calculates the target angle information of the airbag unit based on the horizontal coordinate value of the rotation center of the airbag mechanism in the pre-stored horizontal coordinate system and the calculated first horizontal coordinate information, and sends the target angle information to the control module; wherein, the airbag unit includes a planar rotation mechanism installed on the rear end of the upper side of the vehicle's hood panel, and an airbag mechanism fixedly installed on the output end of the planar rotation mechanism.

[0062] The control module uses the received target angle information to control the planar rotation mechanism to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane, and then controls the airbag mechanism to detonate the airbag.

[0063] The pedestrian airbag deployment control method for vehicles provided in this application utilizes a processing module to determine whether the vehicle will collide with a pedestrian in front. Upon determining that the vehicle will collide with a pedestrian, it calculates the first horizontal coordinate information of the point where the pedestrian's head will land on the vehicle in the horizontal coordinate system. Then, it calculates the target angle information of the airbag unit. Finally, based on the received target angle information, it controls a planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane to the target deployment direction before controlling the airbag mechanism to deploy. This method enables accurate control of the airbag deployment direction in the horizontal plane by predicting the point where the pedestrian's head will land on the vehicle, effectively improving airbag utilization and reducing installation and maintenance costs. It solves the technical problems of low airbag utilization and high installation and maintenance costs commonly found in existing pedestrian airbag systems.

[0064] Pedestrians include people walking on the road and people riding two-wheeled vehicles.

[0065] Specifically, in this embodiment 1, the movement information includes the first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and the second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system.

[0066] The method for obtaining the first mapping relationship includes: conducting pedestrian collision simulation tests, simulating the predicted horizontal coordinates of the pedestrian's head landing point on the vehicle when the front of the vehicle hits the pedestrian under different collision parameters, and obtaining the first mapping relationship based on the collision parameters and the predicted horizontal coordinates; wherein, the collision parameters include height information and movement information.

[0067] By inputting different collision parameters (first relative velocity value, second relative velocity value, current horizontal coordinate value, and pedestrian's height value), the simulation can be performed to determine the impact point of the pedestrian's head on the vehicle, and the corresponding predicted horizontal coordinate value can be output to obtain the first mapping relationship. Before the vehicle hits the pedestrian, the first horizontal coordinate information of the impact point of the pedestrian's head on the vehicle can be calculated using the first mapping relationship and the obtained pedestrian collision parameters, thereby predicting the impact point of the pedestrian's head on the vehicle in advance.

[0068] In one embodiment, the processing module obtains a first relative velocity value, a second relative velocity value, a current horizontal coordinate value, and the pedestrian's height value based on the received height information and movement information.

[0069] The processing module obtains the corresponding predicted horizontal coordinate value based on the obtained first relative velocity value, second relative velocity value, current horizontal coordinate value and height value, combined with the pre-stored first mapping relationship, and uses the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

[0070] In this embodiment 1, the processing module has multiple methods for determining whether a vehicle will collide with a pedestrian in front; in this embodiment 1, the following two methods are listed.

[0071] Option 1:

[0072] The movement information includes the first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and the second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system.

[0073] Vehicle parameter information includes the vehicle's body coordinate region parameters in the horizontal coordinate system;

[0074] The processing module determines whether a vehicle will collide with a pedestrian in front by following these steps:

[0075] Step 1: The processing module performs calculations based on the received movement information and vehicle parameter information, and determines whether the vehicle will collide with the pedestrian in front based on the calculation results. If it is determined that the vehicle will collide with the pedestrian in front, proceed to Step 2; if it is determined that the vehicle will not collide with the pedestrian in front, repeat Step 1.

[0076] Step 2: Based on the received height and movement information, as well as the pre-stored first mapping relationship, the processing module calculates the first horizontal coordinate information of the point where the pedestrian's head lands on the vehicle in the horizontal coordinate system.

[0077] The specific method for calculating whether a vehicle will collide with a pedestrian in front based on the first relative velocity value, the second relative velocity value, the current horizontal coordinate value, and the vehicle body coordinate area parameters is a conventional mathematical algorithm and common knowledge in this technical field. In principle, it only requires calculating and predicting the pedestrian's trajectory in the horizontal coordinate system based on the first relative velocity value, the second relative velocity value, and the current horizontal coordinate value (i.e., calculating and obtaining the pedestrian's movement function), and then, based on the trajectory and the vehicle body coordinate area parameters, determining whether the pedestrian's trajectory partially overlaps with the vehicle body area, it is possible to determine whether the vehicle will collide with the pedestrian in front.

[0078] Option 2:

[0079] The movement information includes the relative distance between the pedestrian in front of the vehicle and the front of the vehicle in the longitudinal direction of the vehicle, the first relative velocity of the pedestrian in the lateral direction of the vehicle and the second relative velocity in the longitudinal direction of the vehicle, and the current horizontal coordinate of the pedestrian in the horizontal coordinate system.

[0080] Vehicle parameter information includes the vehicle's braking deceleration value;

[0081] The data acquisition module also collects the vehicle's current speed information and sends the collected current speed information to the processing module;

[0082] The processing module determines whether a vehicle will collide with a pedestrian in front by following these steps:

[0083] Step 1: The processing module calculates the vehicle's braking distance and braking time based on the vehicle parameter information and current speed information;

[0084] Step 2: The processing module calculates the minimum safe braking distance between the vehicle and the pedestrian in front of the vehicle based on the calculated braking distance value, braking time value, and second relative speed value.

[0085] Step 3: The processing module makes a judgment based on the obtained minimum safe braking distance value and relative distance value; if the relative distance value is less than the minimum safe braking distance value, it is determined that the vehicle will hit the pedestrian in front; if the relative distance value is not less than the minimum safe braking distance value, it is determined that the vehicle will not hit the pedestrian in front.

[0086] Specifically, in the above-mentioned Scheme 2, if the processing module determines that the vehicle will not collide with the pedestrian in front, the processing module sends emergency braking information to the control module, and the control module controls the vehicle's braking system to perform emergency braking based on the received emergency braking information.

[0087] Specifically, in Scheme 2 above, the minimum safe braking distance is calculated using the following formula:

[0088]

[0089] in, This is the minimum safe braking distance value; This is the braking distance value; This is the braking time value; This is the second relative velocity value.

[0090] Preferably, in this embodiment 1, the initial deployment direction of the airbag mechanism is set to the forward direction of the vehicle;

[0091] The control module uses the received target angle information to control the planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane from the initial detonation direction to the target detonation direction.

[0092] By setting the initial deployment direction of the airbag mechanism and setting it to the front of the vehicle, it is possible to conveniently calibrate the rotation position of the planar rotating mechanism and react more quickly when the vehicle hits a child (children are shorter, and their heads will land on the front of the vehicle and the front of the hood when they are hit).

[0093] Preferably, in this embodiment 1, the X-axis direction of the horizontal coordinate system is set to be parallel to the front-rear direction of the vehicle, the positive direction of the X-axis is set to the front direction of the vehicle, and the Y-axis direction of the horizontal coordinate system is set to be parallel to the left-right direction of the vehicle.

[0094] By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis of the horizontal coordinate system to be parallel to the front-rear direction of the vehicle, setting the positive direction of the X-axis to the front direction of the vehicle, and setting the Y-axis of the horizontal coordinate system to be parallel to the left-right direction of the vehicle, the calculation of the first horizontal coordinate information can be simplified, and the calibration of the rotation position of the planar rotation mechanism can be further simplified.

[0095] Example 2:

[0096] As shown in Figures 6 and 7, according to the pedestrian airbag deployment control method for a vehicle provided in Embodiment 1, Embodiment 2 provides a pedestrian airbag deployment control system for a vehicle, including: a data acquisition module, a processing module, and a control module installed on the vehicle, and an airbag unit 2 installed at the rear end of the upper side of the vehicle's hood outer panel 1; the airbag unit 2 includes a planar rotation mechanism 21 installed at the rear end of the upper side of the vehicle's hood outer panel 1, and an airbag mechanism 22 fixedly installed on the output end of the planar rotation mechanism.

[0097] Specifically, as shown in Figure 6, in this embodiment 2, the pedestrian safety airbag deployment control system of the vehicle also includes a decorative cover plate 3. The decorative cover plate 3 is fixedly installed on the upper rear end of the outer panel 1 of the hood. The planar rotation mechanism 21 and the airbag mechanism 22 are both installed between the decorative cover plate and the outer panel 1 of the hood.

[0098] Specifically, as shown in Figures 6 and 7, in this embodiment 2, the planar rotation mechanism 21 includes a servo motor 211 and a motor shaft 212; the airbag mechanism 22 includes a gas generator 221, an airbag 222 and an airbag support 223.

[0099] Gas generator 221 is fixedly mounted on the output end of motor shaft 212; airbag 222 is mounted on gas generator 221; airbag bracket 223 is fixedly mounted on the upper rear end of outer panel 1 of the cover; airbag bracket 223 is used to guide the rotation of airbag; servo motor 211 is used to drive gas generator 221 to rotate in the horizontal plane through motor shaft 212, so as to adjust the detonation direction of airbag 222 in the horizontal plane.

[0100] The pedestrian airbag deployment control method and system for vehicles provided in this application have at least the following technical effects or advantages:

[0101] 1. The pedestrian airbag deployment control method for vehicles provided in this application utilizes a processing module to determine whether the vehicle will collide with a pedestrian in front. Upon determining that the vehicle will collide with a pedestrian, it calculates the first horizontal coordinate information of the point where the pedestrian's head will land on the vehicle in the horizontal coordinate system. Then, it calculates the target angle information of the airbag unit. Finally, based on the received target angle information, it controls a planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane to the target deployment direction before controlling the airbag mechanism to deploy. This method allows for accurate control of the airbag mechanism's deployment direction in the horizontal plane by predicting the point where the pedestrian's head will land on the vehicle, effectively improving airbag utilization and reducing installation and maintenance costs. It solves the technical problems of low airbag utilization and high installation and maintenance costs commonly found in existing pedestrian airbag systems.

[0102] 2. By inputting different collision parameters (first relative velocity value, second relative velocity value, current horizontal coordinate value, and pedestrian's height value), the simulation can be performed to determine the landing point of the pedestrian's head on the vehicle and output the corresponding predicted horizontal coordinate value, thus obtaining the first mapping relationship. Before the vehicle hits the pedestrian, the first horizontal coordinate information of the landing point of the pedestrian's head on the vehicle can be calculated using the first mapping relationship and the obtained pedestrian collision parameters, thereby predicting the landing point of the pedestrian's head on the vehicle in advance.

[0103] 3. By setting the initial deployment direction of the airbag mechanism and setting the initial deployment direction of the airbag mechanism to the front of the vehicle, it is not only convenient to calibrate the rotation position of the planar rotating mechanism, but also to react more quickly when the vehicle hits a child (children are shorter, and when they are hit, their heads will land on the front of the vehicle and the front of the vehicle hood).

[0104] 4. By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis of the horizontal coordinate system to be parallel to the front-rear direction of the vehicle, setting the positive direction of the X-axis to the front direction of the vehicle, and setting the Y-axis of the horizontal coordinate system to be parallel to the left-right direction of the vehicle, the calculation of the first horizontal coordinate information can be simplified, and the calibration of the rotation position of the planar rotation mechanism can be further simplified.

[0105] The above are merely specific application examples of this application and do not constitute any limitation on the scope of protection of this application. All technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of this application.

Claims

1. A method for controlling the deployment of a pedestrian airbag in a vehicle, comprising: The acquisition module collects the height information of pedestrians in front of the vehicle and their movement information in the vehicle's horizontal coordinate system, and sends the collected height information and movement information to the processing module. The processing module uses pre-stored vehicle parameter information and received movement information to determine whether the vehicle will collide with a pedestrian in front. And when it is determined that the vehicle will hit the pedestrian in front, the first horizontal coordinate information of the point where the head of the pedestrian hit will land on the vehicle in the horizontal coordinate system is calculated based on the received height information and movement information, as well as the pre-stored first mapping relationship. The processing module calculates the target angle information of the airbag unit based on the pre-stored horizontal coordinate value of the rotation center of the airbag mechanism in the horizontal plane coordinate system and the calculated first horizontal coordinate information, and sends the target angle information to the control module; wherein, the airbag unit includes a planar rotation mechanism installed at the rear end of the upper side of the vehicle's hood outer panel, and an airbag mechanism fixedly installed on the output end of the planar rotation mechanism; The control module controls the planar rotation mechanism to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane according to the received target angle information, and then controls the airbag mechanism to detonate the airbag.

2. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 1, wherein, The movement information includes the first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and the second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system. The method for obtaining the first mapping relationship includes: conducting a pedestrian collision simulation test, simulating the predicted horizontal coordinate value of the pedestrian's head landing point on the vehicle when the front of the vehicle hits the pedestrian under different collision parameters, and obtaining the first mapping relationship based on the collision parameters and the predicted horizontal coordinate value; wherein, the collision parameters include the height information and the movement information.

3. The method for controlling the deployment of pedestrian airbags in a vehicle according to claim 2, wherein, The processing module obtains the first relative velocity value, the second relative velocity value, the current horizontal coordinate value, and the pedestrian's height value based on the received height information and movement information. The processing module obtains the corresponding predicted horizontal coordinate value based on the obtained first relative velocity value, second relative velocity value, current horizontal coordinate value, and height value, combined with the pre-stored first mapping relationship, and uses the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

4. The method for controlling the deployment of pedestrian airbags in a vehicle according to claim 1, wherein, The movement information includes the first relative velocity value of the pedestrian in front of the vehicle in the left-right direction and the second relative velocity value in the front-back direction of the vehicle, as well as the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system. The vehicle parameter information includes the vehicle body coordinate region parameters in the horizontal plane coordinate system. The method by which the processing module determines whether a vehicle will collide with a pedestrian in front includes the following steps: Step 1: The processing module performs calculations based on the received movement information and vehicle parameter information, and determines whether the vehicle will collide with the pedestrian in front based on the calculation results. If it is determined that the vehicle will collide with the pedestrian in front, proceed to Step 2; if it is determined that the vehicle will not collide with the pedestrian in front, repeat Step 1. Step 2: The processing module calculates the first horizontal coordinate information of the landing point of the pedestrian's head on the vehicle in the horizontal coordinate system based on the received height information and movement information, as well as the pre-stored first mapping relationship.

5. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 1, wherein, The movement information includes the relative distance between the pedestrian in front of the vehicle and the front of the vehicle in the longitudinal direction of the vehicle, the first relative velocity of the pedestrian in the left-right direction of the vehicle and the second relative velocity in the longitudinal direction of the vehicle, and the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system. The vehicle parameter information includes the vehicle's braking deceleration value; The system also collects the vehicle's current speed information through a data acquisition module and sends the collected current speed information to the processing module. The method by which the processing module determines whether a vehicle will collide with a pedestrian in front includes the following steps: Step 1: The processing module calculates the braking distance and braking time of the vehicle based on the vehicle parameter information and the current speed information; Step 2: The processing module calculates the minimum safe braking distance between the vehicle and the pedestrian in front of the vehicle based on the calculated braking distance value, the braking time value, and the second relative speed value; Step 3: The processing module makes a judgment based on the obtained minimum safe braking distance value and the relative distance value; if the relative distance value is less than the minimum safe braking distance value, it is determined that the vehicle will hit the pedestrian in front; if the relative distance value is not less than the minimum safe braking distance value, it is determined that the vehicle will not hit the pedestrian in front.

6. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 5, wherein, If the processing module determines that the vehicle will not collide with a pedestrian in front, the processing module sends an emergency braking message to the control module, and the control module controls the vehicle's braking system to perform emergency braking based on the received emergency braking message.

7. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 5, wherein, The minimum safe braking distance value is calculated using the following formula: , in, This is the minimum safe braking distance value; The braking distance value; The braking time value; This is the second relative velocity value.

8. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 1, wherein, The initial deployment direction of the airbag mechanism is set to the forward direction of the vehicle. The control module uses the received target angle information to control the planar rotation mechanism to drive the airbag mechanism to rotate in the horizontal plane from the initial detonation direction to the target detonation direction.

9. A pedestrian airbag deployment control system for a vehicle, comprising: The vehicle includes a data acquisition module, a processing module, and a control module; a planar rotating mechanism installed on the upper rear end of the vehicle's hood panel; and an airbag mechanism fixedly installed on the output end of the planar rotating mechanism. The pedestrian airbag system of the vehicle is used to perform the steps in the method for controlling the deployment of the pedestrian airbag of the vehicle as described in any one of claims 1-8.

10. The pedestrian airbag deployment control system for a vehicle according to claim 9, wherein, It also includes a decorative cover plate, which is fixedly installed on the upper rear end of the outer panel of the hood, and the planar rotation mechanism and the airbag mechanism are both installed between the decorative cover plate and the outer panel of the hood.

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