A method and system for controlled deployment of a pedestrian airbag of a vehicle

Abstract

The present application belongs to the technical field of vehicle safety engineering, and particularly relates to a point explosion control method and system for a pedestrian safety airbag of a vehicle. The point explosion control method comprises collecting the height information of a pedestrian in front of the vehicle and the movement information of the pedestrian in front of the vehicle in a horizontal plane coordinate system of the vehicle by a collection module, and sending the collected height information and movement information to a processing module; using the processing module to determine whether the vehicle will collide with the pedestrian in front according to the pre-stored vehicle parameter information and the received information; and when it is determined that the vehicle will collide with the pedestrian in front, combining a pre-stored first mapping relationship to calculate the first horizontal coordinate information of the landing point of the head of the collided pedestrian on the vehicle in the horizontal plane coordinate system; using the processing module to calculate the target angle information of the airbag unit, using a control module to control a plane rotating mechanism to drive the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane, and then to point explode the airbag.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle safety engineering, and particularly relates to a point explosion control method and system of a pedestrian safety airbag of a vehicle. BACKGROUND

[0002] Currently, technology, low wind resistance, lightweight, etc. are the research and development trends of electric vehicles, which bring greater challenges to pedestrian head impact protection, such as front running lights, low crouching hoods, aluminum hoods, etc. Pedestrian head impact protection optimization is divided into three categories: the first category is to optimize the structural design of the vehicle; the second category is to set up an active hood; and the third category is to install a pedestrian safety airbag system on the hood outer plate of the vehicle; among them, the optimization of the structural design of the vehicle is usually affected by the layout and is difficult to achieve; most of the active hoods on the market have the common problems of high cost, non-reusable, and easy to trigger; and compared with the first two categories of pedestrian head impact protection optimization, the pedestrian safety airbag can provide more reliable secondary collision protection for the hit pedestrians.

[0003] However, since each safety airbag of the existing pedestrian safety airbag system is usually a fixed structure with a single point explosion direction, there is a problem that each safety airbag can only cover a certain fixed area with low utilization rate; therefore, in order to ensure the secondary collision protection function of the safety airbag, the existing pedestrian safety airbag usually increases the number of airbags (arranging airbags on the vehicle hood, the vehicle front wall and the vehicle A pillar) and the size to increase the coverage rate of the airbag to ensure that the head of the hit pedestrian is covered as much as possible. This also makes the existing pedestrian safety airbag system usually have the problems of low utilization rate of safety airbag, high installation and maintenance cost. SUMMARY

[0004] In order to solve the defects of the prior art, the present application provides a point explosion control method and system of a pedestrian safety airbag of a vehicle to solve the technical problem that the existing pedestrian safety airbag system usually has the problems of low utilization rate of safety airbag, high installation and maintenance cost.

[0005] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0006] A point explosion control method of a pedestrian safety airbag of a vehicle, the point explosion control method comprising:

[0007] acquiring the height information of the pedestrians in front of the vehicle and the movement information of the pedestrians in front of the vehicle in the horizontal coordinate system of the vehicle by the acquisition module, and sending the acquired height information and movement information to the processing module;

[0008] The processing module is used to determine whether the vehicle will hit the pedestrian in front according to the pre-stored vehicle parameter information and the received movement information, and when it is determined that the vehicle will hit the pedestrian in front, the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle in the horizontal plane coordinate system is calculated according to the received height information and the movement information and the pre-stored first mapping relationship.

[0009] The processing module is used to calculate the target angle information of the airbag unit according to the 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 send the target angle information to the control module; wherein the airbag unit comprises a planar rotating mechanism installed at the rear end of the upper side of the hood outer plate of the vehicle, and an airbag mechanism fixedly installed on the output end of the planar rotating mechanism.

[0010] The control module is used to control the planar rotating mechanism to drive the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane according to the received target angle information, and then control the airbag mechanism to point explode the airbag.

[0011] The point explosion control method of the pedestrian airbag of the vehicle provided by the present application determines whether the vehicle will hit the pedestrian in front by using the processing module, and when it is determined that the vehicle will hit the pedestrian in front, the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle in the horizontal plane coordinate system is calculated; then the target angle information of the airbag unit is calculated, and finally the planar rotating mechanism is controlled to drive the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane according to the received target angle information, and then the airbag mechanism is controlled to point explode the airbag. The point explosion control method of the pedestrian airbag of the vehicle provided by the present application can accurately control the point explosion direction of the airbag mechanism in the horizontal plane by predicting the landing position of the head of the hit pedestrian on the vehicle, can effectively improve the utilization rate of the airbag, and reduce the installation and maintenance cost; and solves the technical problem of the low utilization rate of the existing pedestrian airbag system and the high installation and maintenance cost.

[0012] The pedestrian includes personnel walking on the road and personnel riding a two-wheeled vehicle.

[0013] Further, the movement information includes the first relative speed value of the pedestrian in front of the vehicle in the left-right direction of the vehicle and the second relative speed value in the front-rear direction of the vehicle, and the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal plane coordinate system.

[0014] The method for obtaining the first mapping relationship comprises: performing a pedestrian collision simulation test, simulating the predicted horizontal coordinate value of the landing point of the head of the struck pedestrian on the vehicle when the front end of the vehicle collides with the pedestrian under different collision parameters, and obtaining the first mapping relationship according to the collision parameters and the predicted horizontal coordinate value; wherein the collision parameters comprise the height information and the movement information.

[0015] The first mapping relationship can be obtained by inputting different collision parameters (the first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value of the pedestrian) to simulate the landing point of the head of the struck pedestrian on the vehicle and output the corresponding predicted horizontal coordinate value; before the vehicle collides with the pedestrian, the first horizontal coordinate information of the landing point of the head of the struck pedestrian on the vehicle can be calculated according to the first mapping relationship and the obtained collision parameters of the pedestrian, and the landing position of the head of the pedestrian on the vehicle can be predicted in advance.

[0016] Further, the processing module obtains the first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value of the pedestrian according to the received height information and movement information.

[0017] The processing module obtains the corresponding predicted horizontal coordinate value according to the obtained first relative speed value, second relative speed value, current horizontal coordinate value and height value, combines the pre-stored first mapping relationship, and obtains the corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

[0018] Further, the movement information comprises the first relative speed value of the pedestrian in front of the vehicle in the left and right directions of the vehicle, the second relative speed value of the pedestrian in front of the vehicle in the front and rear directions of the vehicle, and the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal plane coordinate system.

[0019] The vehicle parameter information comprises the vehicle body coordinate region parameter of the vehicle in the horizontal plane coordinate system.

[0020] The method for the processing module to determine whether the vehicle will collide with the pedestrian in front of the vehicle comprises the following steps:

[0021] Step 1: the processing module performs calculation according to the received movement information and vehicle parameter information, and determines whether the vehicle will collide with the pedestrian in front of the vehicle according to the calculation result; if it is determined that the vehicle will collide with the pedestrian in front of the vehicle, step 2 is entered; if it is determined that the vehicle will not collide with the pedestrian in front of the vehicle, step 1 is repeatedly executed.

[0022] Step 2: The processing module calculates the first horizontal coordinate information of the falling point of the head of the pedestrian hit by the vehicle in the horizontal plane coordinate system according to the received height information and movement information, and a pre-stored first mapping relationship.

[0023] The specific method for determining whether the vehicle will hit the pedestrian in front according to the first relative speed value, the second relative speed value, the current horizontal coordinate value and the vehicle body coordinate region parameter is a conventional mathematical algorithm, which is common knowledge in the technical field, and in principle, only the first relative speed value, the second relative speed value and the current horizontal coordinate value are needed to calculate the movement trajectory of the pedestrian in the horizontal plane coordinate system (i.e. to obtain the movement function of the pedestrian), and then according to the movement trajectory and the vehicle body coordinate region parameter, it is determined whether the movement trajectory of the pedestrian will partially coincide with the vehicle body region, so as to determine whether the vehicle will hit the pedestrian in front.

[0024] Further, the movement information includes a relative distance value between the pedestrian in front of the vehicle and the front end of the vehicle in the front-rear direction of the vehicle, a first relative speed value of the pedestrian in front of the vehicle in the left-right direction of the vehicle and a second relative speed value in the front-rear direction of the vehicle, and a current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal plane coordinate system;

[0025] The vehicle parameter information includes a braking deceleration value of the vehicle;

[0026] The current speed information of the vehicle is also collected by the collection module, and the collected current speed information is sent to the processing module;

[0027] The method for determining whether the vehicle will hit the pedestrian in front by the processing module includes the following steps:

[0028] Step 1: The processing module calculates the braking distance value and the braking time value of the vehicle according to the vehicle parameter information and the current speed information;

[0029] Step 2: The processing module calculates the minimum safe braking distance value between the vehicle and the pedestrian in front of the vehicle according to the calculated braking distance value, braking time value and second relative speed value;

[0030] Step 3: The processing module judges according to 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.

[0031] Further, if the processing module determines that the vehicle will not hit the pedestrian in front, the processing module sends emergency braking information to the control module, and the control module controls the braking system of the vehicle to perform emergency braking according to the received emergency braking information.

[0032] Further, the minimum safe braking distance value is calculated by the following formula:

[0033] S=S1+Vt

[0034] Wherein, S is the minimum safe braking distance value; S1 is the braking distance value; t is the braking time value; V is the second relative speed value.

[0035] Further, the initial point explosion direction of the airbag mechanism is set to the front direction of the vehicle.

[0036] The control module controls the planar rotating mechanism to drive the airbag mechanism to rotate from the initial point explosion direction to the target point explosion direction in the horizontal plane according to the received target angle information.

[0037] By setting the initial point explosion direction of the airbag mechanism, and setting the initial point explosion direction of the airbag mechanism to the front direction of the vehicle, the rotation position of the planar rotating mechanism can be conveniently calibrated, and the reaction can be faster when the vehicle hits a child (the child is shorter, and the falling point of the head on the vehicle is biased to the front side of the vehicle front and vehicle hood when hit).

[0038] Further, the X-axis direction 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 be 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.

[0039] By setting the initial point explosion direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis direction 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 be the front direction of the vehicle, and setting the Y-axis direction 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 work of the rotation position of the planar rotating mechanism can be further simplified.

[0040] According to the pedestrian airbag point explosion control method of the vehicle provided by the present application, the present application also provides a pedestrian airbag point explosion control system of the vehicle, which comprises: a collection module, a processing module and a control module installed on the vehicle, a planar rotating mechanism installed on the upper side of the rear end of the hood outer plate of the vehicle, and an airbag mechanism fixedly installed on the output end of the planar rotating mechanism.

[0041] Further, the pedestrian airbag point explosion control system of the vehicle further comprises a decorative cover plate fixedly installed at the rear end of the upper side of the hood outer plate, and the planar rotating mechanism and the airbag mechanism are both installed between the decorative cover plate and the hood outer plate. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor based on these drawings.

[0043] Figure 1 is the state of the planar rotating mechanism driving the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane in Example 1 Figure 1 ;

[0044] Figure 2 is the state of the planar rotating mechanism driving the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane in Example 1 Figure 2 ;

[0045] Figure 3 is the state of the planar rotating mechanism driving the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane in Example 1 Figure 3 ;

[0046] Figure 4 is the state of the planar rotating mechanism driving the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane in Example 1 Figure 4 ;

[0047] Figure 5 is the state of the planar rotating mechanism driving the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane in Example 1 Figure 5 ;

[0048] Figure 6 is the assembled explosion structure schematic diagram of the hood outer plate, the planar rotating mechanism, the airbag mechanism and the decorative cover plate in Example 2;

[0049] Figure 7 is the assembled structure schematic diagram of the planar rotating mechanism and the airbag mechanism in Example 2;

[0050] Among them, 1—hood outer plate, 2—airbag unit, 3—decorative cover plate;

[0051] 21—planar rotating mechanism, 22—airbag mechanism;

[0052] 211 - servo motor, 212 - motor shaft;

[0053] 221 - gas generator, 222 - airbag, 223 - airbag bracket. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0055] Embodiment 1:

[0056] As shown in the embodiment 1, the point explosion control method of the pedestrian safety airbag of the vehicle comprises: Figures 1 to 5

[0057] The height information of the pedestrian in front of the vehicle and the movement information of the pedestrian in front of the vehicle in the horizontal plane coordinate system of the vehicle are collected by the collection module, and the collected height information and movement information are sent to the processing module;

[0058] The processing module is used to determine whether the vehicle will hit the pedestrian in front according to the pre-stored vehicle parameter information and the received movement information, and when it is determined that the vehicle will hit the pedestrian in front, the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle in the horizontal plane coordinate system is calculated according to the received height information and movement information and the pre-stored first mapping relationship;

[0059] The processing module is used to calculate the target angle information of the airbag unit according to the 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 send the target angle information to the control module; wherein the airbag unit comprises a planar rotating mechanism installed at the rear end of the upper side of the hood outer plate of the vehicle, and an airbag mechanism fixedly installed on the output end of the planar rotating mechanism;

[0060] The control module is used to control the planar rotating mechanism to drive the airbag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane after receiving the target angle information, and then control the airbag mechanism to point explode the airbag.

[0061] ​The point explosion control method of the pedestrian safety airbag of the vehicle provided by the present application is to determine whether the vehicle will hit the pedestrian in front by using the processing module; and when it is determined that the vehicle will hit the pedestrian in front, the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle in the horizontal plane coordinate system is calculated; then the target angle information of the airbag unit is calculated, and finally the airbag mechanism is controlled to rotate the point explosion direction to the target point explosion direction in the horizontal plane after receiving the target angle information, and then the airbag mechanism is controlled to explode the airbag. The point explosion control method of the pedestrian safety airbag of the vehicle provided by the present application can accurately control the point explosion direction of the airbag mechanism in the horizontal plane by predicting the landing position of the head of the hit pedestrian on the vehicle, which can effectively improve the utilization rate of the airbag and reduce the installation and maintenance cost; and the technical problem of the low utilization rate of the existing pedestrian safety airbag system and the high installation and maintenance cost is solved.

[0062] The pedestrian includes a person walking on the road and a person riding a two-wheeled vehicle.

[0063] Specifically, in the present embodiment 1, the movement information includes the first relative speed value of the pedestrian in front of the vehicle in the left-right direction of the vehicle and the second relative speed value in the front-rear direction of the vehicle, and the current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal plane coordinate system.

[0064] The method for obtaining the first mapping relationship includes: performing a pedestrian collision simulation test, simulating the predicted horizontal coordinate value of the landing point of the head of the hit pedestrian on the vehicle when the front end of the vehicle hits the pedestrian under different collision parameters, and obtaining the first mapping relationship according to the collision parameters and the predicted horizontal coordinate value; wherein the collision parameters include the height information and the movement information.

[0065] By inputting different collision parameters (the first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value of the pedestrian), the landing point of the head of the hit pedestrian on the vehicle is simulated, and the corresponding predicted horizontal coordinate value is outputted, so that the first mapping relationship can be obtained; before the vehicle hits the pedestrian, the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle can be calculated by the first mapping relationship and the obtained collision parameters of the pedestrian, and the landing position of the head of the pedestrian on the vehicle can be predicted in advance.

[0066] In one of the embodiments, the processing module obtains the first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value of the pedestrian according to the received height information and movement information.

[0067] The processing module obtains the corresponding predicted horizontal coordinate value according to the obtained first relative speed value, second relative speed value, current horizontal coordinate value and height value, and combines the pre-stored first mapping relationship, and takes the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

[0068] In this embodiment 1, the method for the processing module to determine whether the vehicle will hit the pedestrian in front includes multiple schemes; in this embodiment 1, the following two schemes are listed.

[0069] Scheme one:

[0070] The movement information includes a first relative speed value of the pedestrian in front of the vehicle in the left-right direction of the vehicle, a second relative speed value of the pedestrian in front of the vehicle in the front-rear direction of the vehicle, and a current horizontal coordinate value of the pedestrian in front of the vehicle in the horizontal coordinate system;

[0071] The vehicle parameter information includes a vehicle body coordinate region parameter of the vehicle in the horizontal coordinate system;

[0072] The method for the processing module to determine whether the vehicle will hit the pedestrian in front includes the following steps:

[0073] Step 1: The processing module performs calculation according to the received movement information and vehicle parameter information, and determines whether the vehicle will hit the pedestrian in front according to the calculation result, if it is determined that the vehicle will hit the pedestrian in front, then step 2 is entered; if it is determined that the vehicle will not hit the pedestrian in front, then step 1 is repeatedly executed;

[0074] Step 2: The processing module calculates the first horizontal coordinate information of the landing point of the head of the hit pedestrian on the vehicle in the horizontal coordinate system according to the received height information and movement information, and the pre-stored first mapping relationship.

[0075] The specific method for determining whether the vehicle will hit the pedestrian in front according to the first relative speed value, the second relative speed value, the current horizontal coordinate value and the vehicle body coordinate region parameter is a conventional mathematical algorithm, which is common knowledge in the technical field, and in principle, only the first relative speed value, the second relative speed value and the current horizontal coordinate value are needed to calculate the predicted movement trajectory of the pedestrian in the horizontal coordinate system (i.e. to obtain the movement function of the pedestrian), and then according to the movement trajectory and the vehicle body coordinate region parameter, whether the movement trajectory of the pedestrian will partially coincide with the vehicle body region can be determined, i.e. whether the vehicle will hit the pedestrian in front.

[0076] Scheme two:

[0077] The mobile information includes a relative distance value between the pedestrian in front of the vehicle and the front end of the vehicle in the front-rear direction of the vehicle, a first relative speed value of the pedestrian in front of the vehicle in the left-right direction of the vehicle and a second relative speed value in the front-rear direction of the vehicle, and a current horizontal coordinate value of the pedestrian in front of the vehicle in a horizontal plane coordinate system;

[0078] The vehicle parameter information includes a braking deceleration value of the vehicle;

[0079] The acquisition module further acquires current speed information of the vehicle, and sends the acquired current speed information to the processing module;

[0080] The method for the processing module to determine whether the vehicle will collide with the pedestrian in front of the vehicle includes the following steps:

[0081] Step 1: The processing module calculates a braking distance value and a braking time value of the vehicle according to the vehicle parameter information and the current speed information;

[0082] Step 2: The processing module calculates a minimum safe braking distance value between the vehicle and the pedestrian in front of the vehicle according to the calculated braking distance value, the braking time value and the second relative speed value;

[0083] Step 3: The processing module determines according to 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 collide with the pedestrian in front of the vehicle; if the relative distance value is not less than the minimum safe braking distance value, it is determined that the vehicle will not collide with the pedestrian in front of the vehicle.

[0084] Specifically, in the above-mentioned scheme two, if the processing module determines that the vehicle will not collide with the pedestrian in front of the vehicle, the processing module sends emergency braking information to the control module, and the control module controls the braking system of the vehicle to perform emergency braking according to the received emergency braking information.

[0085] Specifically, in the above-mentioned scheme two, the minimum safe braking distance value is calculated by the following formula:

[0086] S=S1+Vt

[0087] Wherein, S is the minimum safe braking distance value; S1 is the braking distance value; t is the braking time value; V is the second relative speed value.

[0088] Preferably, in the embodiment 1, the initial point explosion direction of the airbag mechanism is set as the front direction of the vehicle;

[0089] The control module controls the planar rotating mechanism to drive the airbag mechanism to rotate from the initial point explosion direction to the target point explosion direction in the horizontal plane according to the received target angle information.

[0090] By setting the initial point explosion direction of the airbag mechanism to the front direction of the vehicle, the rotation position of the planar rotating mechanism can be calibrated conveniently, and the airbag can be deployed more quickly when the vehicle hits a child.

[0091] Preferably, in the embodiment 1, the X-axis direction 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 be the front direction of the vehicle. The Y-axis direction of the horizontal coordinate system is set to be parallel to the left-right direction of the vehicle.

[0092] By setting the initial point explosion direction of the airbag mechanism to the front direction of the vehicle, the X-axis direction of the horizontal coordinate system to be parallel to the front-rear direction of the vehicle, and the positive direction of the X-axis to be the front direction of the vehicle, the Y-axis direction 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 rotating mechanism can be further simplified.

[0093] Embodiment 2

[0094] As shown in Figure 6 and Figure 7 , according to the point explosion control method of the pedestrian airbag of the vehicle provided in the embodiment 1, the embodiment 2 provides a point explosion control system of the pedestrian airbag of the vehicle, which comprises a collection module, a processing module and a control module installed on the vehicle, and a rear end of the airbag unit 2 installed on the upper side of the hood outer plate 1 of the vehicle. The airbag unit 2 comprises a planar rotating mechanism 21 installed on the rear end of the upper side of the hood outer plate 1 of the vehicle, and an airbag mechanism 22 fixedly installed on the output end of the planar rotating mechanism.

[0095] Specifically, as shown in Figure 6 , in the embodiment 2, the point explosion control system of the pedestrian airbag of the vehicle further comprises a decorative cover plate 3 fixedly installed on the upper side of the rear end of the hood outer plate 1, and the planar rotating mechanism 21 and the airbag mechanism 22 are both installed between the decorative cover plate and the hood outer plate.

[0096] Specifically, as shown in Figure 6 and Figure 7 , in the embodiment 2, the planar rotating mechanism 21 comprises a servo motor 211 and a motor shaft 212; the airbag mechanism 22 comprises a gas generator 221, an airbag 222 and an airbag bracket 223.

[0097] The gas generator 221 is fixedly installed on the output end of the motor rotating shaft 212; the air bag 222 is installed on the gas generator 221, the air bag support 223 is fixedly installed on the upper side of the rear end of the machine cover outer plate 1, the air bag support 223 is used for guiding the rotation of the air bag, and the servo motor 211 is used for driving the gas generator 221 to rotate in the horizontal plane through the motor rotating shaft 212, so as to adjust the point explosion direction of the air bag 222 in the horizontal plane.

[0098] The point explosion control method and system of the pedestrian safety air bag of the vehicle provided by the application have at least the following technical effects or advantages:

[0099] 1、The point explosion control method of the pedestrian safety air bag of the vehicle provided by the application judges whether the vehicle will hit the front pedestrian by using the processing module; when it is determined that the vehicle will hit the front pedestrian, the first horizontal coordinate information of the falling point of the head of the hit pedestrian on the vehicle in the horizontal coordinate system is calculated; the target angle information of the safety air bag unit is calculated, and finally the horizontal plane rotating mechanism is controlled to drive the safety air bag mechanism to rotate the point explosion direction to the target point explosion direction in the horizontal plane according to the received target angle information, and the safety air bag mechanism is controlled to explode the air bag. The point explosion control method of the pedestrian safety air bag of the vehicle provided by the application can accurately control the point explosion direction of the safety air bag mechanism in the horizontal plane by predicting the falling point position of the head of the hit pedestrian on the vehicle, can effectively improve the utilization rate of the safety air bag, and reduce the installation and maintenance cost; and the technical problem of the low utilization rate of the safety air bag and the high installation and maintenance cost of the existing pedestrian safety air bag system is solved.

[0100] 2、By inputting different collision parameters (the first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value of the pedestrian), the falling point of the head of the hit pedestrian on the vehicle is simulated and simulated, and the corresponding predicted horizontal coordinate value is output, that is, the first mapping relationship is obtained; before the vehicle hits the pedestrian, the first horizontal coordinate information of the falling point of the head of the hit pedestrian on the vehicle can be calculated through the first mapping relationship and the obtained collision parameters of the pedestrian, and the falling point position of the head of the pedestrian on the vehicle can be predicted in advance.

[0101] 3、By setting the initial point explosion direction of the safety air bag mechanism, and setting the initial point explosion direction of the safety air bag mechanism as the front direction of the vehicle, the rotation position of the horizontal plane rotating mechanism can be conveniently calibrated, and the reaction can be faster when the vehicle hits a child (the child is shorter, and the falling point of the head on the vehicle will be biased to the front side of the vehicle front wall and the vehicle cover plate when hit).

[0102] 4. By setting the initial point explosion direction of the airbag mechanism as the front direction of the vehicle, setting the X axis direction of the horizontal coordinate system as parallel to the front-rear direction of the vehicle, setting the positive direction of the X axis as the front direction of the vehicle, and setting the Y axis direction of the horizontal coordinate system as 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.

[0103] The above is only a specific application example of the present application, and does not constitute any limitation on the protection scope of the present application. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the present application.

Claims

1. A method for controlling the deployment of a pedestrian airbag in a vehicle, characterized in that, include: 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 coordinates of the rotation center of the airbag mechanism in the horizontal coordinate system and the calculated first horizontal coordinate information, and sends the target angle information to the control module. The airbag unit includes a planar rotation mechanism mounted on the upper rear end of the vehicle's hood panel, and an airbag mechanism fixedly mounted on the output end of the planar rotation mechanism. The planar rotation mechanism includes a servo motor and a motor shaft. The airbag mechanism includes a gas generator, an airbag, and an airbag bracket. The gas generator is fixedly mounted on the output end of the motor shaft. The airbag is mounted on the gas generator, and the airbag bracket is fixedly mounted on the upper rear end of the hood panel. The airbag bracket guides the rotation of the airbag, and the servo motor drives the gas generator to rotate in the horizontal plane via the motor shaft to adjust the airbag's detonation direction in the horizontal plane. 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 pedestrian airbags in a vehicle according to claim 1, characterized in that: 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. 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, characterized in that: 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, characterized in that: 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. 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 pedestrian airbags in a vehicle according to claim 1, characterized in that: 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, characterized in that: 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 pedestrian airbags in a vehicle according to claim 5, characterized in that: The minimum safe braking distance value is calculated using the following formula: S = S1 + Vt Wherein, S is the minimum safe braking distance value; S1 is the braking distance value; t is the braking time value; and V is the second relative speed value.

8. The method for controlling the deployment of a pedestrian airbag in a vehicle according to claim 1, characterized in that: 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, characterized in that, include: 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 planar rotation mechanism includes a servo motor and a motor shaft; the airbag mechanism includes a gas generator, an airbag, and an airbag bracket; the gas generator is fixedly mounted on the output end of the motor shaft; the airbag is mounted on the gas generator, and the airbag bracket is fixedly mounted on the upper rear end of the outer panel of the hood. The airbag bracket is used to guide the rotation of the airbag, and the servo motor is used to drive the gas generator to rotate in the horizontal plane through the motor shaft to adjust the detonation direction of the airbag in the horizontal plane. 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, characterized in that: 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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