Explosion control method and system for pedestrian safety air bag of vehicle

Abstract

The invention belongs to the technical field of vehicle safety engineering, and particularly relates to an explosion control method and system.The explosion control method comprises the steps that height information of pedestrians in front of a vehicle and movement information of the pedestrians in front of the vehicle in a horizontal plane coordinate system of the vehicle are collected through a collection module; the collected height information and movement information are sent to the processing module; the processing module is used for judging whether the vehicle can collide with a pedestrian in front or not according to pre-stored vehicle parameter information and the received information; when it is judged that the vehicle will collide with the pedestrian ahead, first horizontal coordinate information of a falling point of the head of the collided pedestrian on the vehicle in the horizontal plane coordinate system is obtained through calculation in combination with a pre-stored first mapping relation; the processing module is used for calculating target angle information of the safety air bag unit, the control module is used for controlling the plane rotating mechanism to drive the safety air bag mechanism to rotate the explosion direction to the target explosion direction in the horizontal plane, and then the air bag is exploded.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle safety engineering, and in particular relates to a detonation control method and system for a pedestrian safety airbag of a vehicle. Background Art

[0002] At present, the research and development trends of electric vehicles are technological, low wind resistance, and lightweight. The resulting front through-lights, low-lying hoods, and aluminum hoods all bring greater challenges to pedestrian head-on protection. Pedestrian head-on 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 airbag system on the outer panel of the vehicle's hood; among them, the structural design optimization of the vehicle is usually affected by the shape and layout, and it is difficult to achieve; most of the active hoods on the market currently have the common problems of high cost, non-reusability, and easy mis-triggering; compared with the first two types of pedestrian head-on protection optimization methods, pedestrian airbags can provide more reliable secondary collision protection for the hit pedestrians;

[0003] However, since each airbag of an existing pedestrian airbag system is usually a fixed structure with a single detonation direction, each airbag can only cover a certain fixed area, resulting in a low utilization rate. Therefore, in order to ensure the secondary collision protection function of the airbag, the existing pedestrian airbag usually increases the number of airbags (the airbags are arranged on the vehicle hood, the front wall and the A-pillar at the same time) and the size of the airbag to increase the coverage of the airbag to ensure that all possible landing points of the head of the struck pedestrian are covered as much as possible. This also makes the existing pedestrian airbag system usually have the problem of low airbag utilization rate and high installation and maintenance costs. Summary of the invention

[0004] In order to solve the above-mentioned defects of the prior art, the present invention provides a detonation control method and system for a pedestrian airbag of a vehicle to solve the technical problems that the existing pedestrian airbag system usually has low airbag utilization rate and high installation and maintenance costs.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A detonation control method for a pedestrian airbag of a vehicle, the detonation control method comprising:

[0007] The collecting module collects 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, and sends the collected height information and movement information to the processing module;

[0008] Using the processing module 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, calculating 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 according to the received height information and the movement information and the pre-stored first mapping relationship;

[0009] The processing module calculates target angle information of the airbag unit according to 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 plane rotating mechanism installed at the rear end of the upper side of the hood outer panel of the vehicle, and the airbag mechanism fixedly installed on the output end of the plane rotating mechanism;

[0010] The control module controls the plane 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.

[0011] The detonation control method of the pedestrian airbag of the vehicle provided by the present invention 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; the target angle information of the airbag unit is then calculated, and finally the plane rotation mechanism is controlled according to the received target angle information to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane, and then the airbag mechanism is controlled to detonate the airbag. The detonation control method of the pedestrian airbag of the vehicle provided by the present invention can accurately control the detonation direction of the airbag mechanism in the horizontal plane by predicting the landing point 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 costs; and solves the technical problems that the existing pedestrian airbag system usually has the problems of low airbag utilization rate and high installation and maintenance costs.

[0012] The pedestrians include people walking on the road and people riding two-wheeled vehicles.

[0013] Further, 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 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;

[0014] The method for obtaining the first mapping relationship includes: conducting 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 based on the collision parameters and the predicted horizontal coordinate value; wherein the collision parameters include the height information and the movement information.

[0015] 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), simulating the landing point of the head of the hit pedestrian on the vehicle, and outputting the corresponding predicted horizontal coordinate value, 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 through 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.

[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 the movement information;

[0017] The processing module obtains a corresponding predicted horizontal coordinate value based on the obtained first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value, in combination with the pre-stored first mapping relationship, and uses the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

[0018] Further, 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 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;

[0019] The vehicle parameter information includes vehicle body coordinate area parameters of the vehicle in the horizontal plane coordinate system;

[0020] The method for the processing module to determine whether the vehicle will hit the pedestrian in front includes the following steps:

[0021] Step 1: The processing module performs calculations based on the received movement information and the vehicle parameter information, and determines whether the vehicle will hit the pedestrian in front according to the calculation results. If it is determined that the vehicle will hit the pedestrian in front, the process proceeds to step 2; if it is determined that the vehicle will not hit the pedestrian in front, step 1 is repeated.

[0022] 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 plane coordinate system according to the received height information and the movement information and the pre-stored first mapping relationship.

[0023] Among them, the specific method for calculating and judging whether the vehicle will hit the pedestrian in front based on the first relative speed value, the second relative speed value, the current horizontal coordinate value and the vehicle body coordinate area parameters belongs to a conventional mathematical algorithm and is common knowledge in the professional and technical field. In principle, it is only necessary to calculate and predict the motion trajectory of the pedestrian in the horizontal plane coordinate system (that is, calculate and obtain the movement function of the pedestrian) based on the first relative speed value, the second relative speed value and the current horizontal coordinate value, and then, based on the motion trajectory and the vehicle body coordinate area parameters, by judging whether the motion trajectory of the pedestrian will partially overlap with the vehicle body area, it is possible to judge 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-to-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-to-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 the processing module to determine whether the vehicle will hit the pedestrian in front includes the following steps:

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

[0029] 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;

[0030] 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.

[0031] Furthermore, 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 vehicle's braking system to perform emergency braking according to the received emergency braking information.

[0032] Furthermore, the minimum safe braking distance value is calculated using the following formula:

[0033] S=S1+Vt

[0034] Among them, 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.

[0035] Furthermore, the initial detonation direction of the airbag mechanism is set to the front direction of the vehicle;

[0036] The control module is used to control the plane rotation mechanism according to the received target angle information to drive the airbag mechanism to rotate from the initial detonation direction to the target detonation direction in the horizontal plane.

[0037] By setting an initial detonation direction for the airbag mechanism, and setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, it is convenient to calibrate the rotation position of the planar rotating mechanism, and it can also react more quickly when the vehicle hits a child (children are shorter in height, and the point where their heads land on the vehicle when hit will be biased towards the front of the vehicle's front surround and the front side of the vehicle's hood cover).

[0038] Furthermore, the X-axis direction of the horizontal plane 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 be the front direction of the vehicle, and the Y-axis direction of the horizontal plane coordinate system is set to be parallel to the left-right direction of the vehicle.

[0039] By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis direction of the horizontal plane coordinate system to be parallel to the front and 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 direction of the horizontal plane coordinate system to be parallel to the left and 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 plane rotation mechanism can be further simplified.

[0040] According to the detonation control method of the pedestrian safety airbag of a vehicle provided by the present invention, the present invention also provides a detonation control system of the pedestrian safety airbag of a vehicle, including: an acquisition module, a processing module and a control module installed on the vehicle, a planar rotating 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 rotating mechanism.

[0041] Furthermore, the detonation control system of the pedestrian airbag of the vehicle also includes a decorative cover plate, which is fixedly mounted on the rear end of the upper side of the hood outer panel, and the planar rotating mechanism and the airbag mechanism are both mounted between the decorative cover plate and the hood outer panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 The plane rotation mechanism in the first embodiment drives the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane. Figure 1 ;

[0044] Figure 2 The plane rotation mechanism in the first embodiment drives the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane. Figure 2 ;

[0045] Figure 3 The plane rotation mechanism in the first embodiment drives the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane. Figure 3 ;

[0046] Figure 4 The plane rotation mechanism in the first embodiment drives the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane. Figure 4 ;

[0047] Figure 5 The plane rotation mechanism in the first embodiment drives the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane. Figure 5 ;

[0048] Figure 6 It is a schematic diagram of the exploded structure of the assembly of the hood outer panel, the plane rotating mechanism, the airbag mechanism and the decorative cover plate in Example 2;

[0049] Figure 7 is a schematic diagram of the assembly structure of the plane rotating mechanism and the airbag mechanism in Example 2;

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

[0051] 21—plane rotation mechanism, 22—airbag mechanism;

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

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

[0054] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0055] Embodiment 1:

[0056] like Figures 1 to 5 As shown, embodiment 1 provides a detonation control method for a pedestrian airbag of a vehicle, and the detonation control method includes:

[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] Using the processing module 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 determining that the vehicle will hit the pedestrian in front, calculating 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 according to the received height information and movement information and the pre-stored first mapping relationship;

[0059] Utilizing a processing module to calculate target angle information of the airbag unit according to the horizontal coordinate value of the rotation center of the airbag mechanism in the pre-stored horizontal plane coordinate system and the calculated first horizontal coordinate information, and sending the target angle information to the control module; wherein the airbag unit includes a plane rotating mechanism installed at the rear end of the upper side of the hood outer panel of the vehicle, and an airbag mechanism fixedly installed on the output end of the plane rotating mechanism;

[0060] The control module controls the plane 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.

[0061] The detonation control method of the pedestrian airbag of the vehicle provided by the present invention determines whether the vehicle will hit the pedestrian in front by using a 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, according to the received target angle information, the plane rotation mechanism is controlled to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane, and then the airbag mechanism is controlled to detonate the airbag. The detonation control method of the pedestrian airbag of the vehicle provided by the present invention can accurately control the detonation direction of the airbag mechanism in the horizontal plane by predicting the landing point 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 costs; and solves the technical problems that the existing pedestrian airbag system usually has the problems of low airbag utilization rate and high installation and maintenance costs.

[0062] Among them, pedestrians include people walking on the road and people riding two-wheeled vehicles.

[0063] Specifically, in the first embodiment, 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 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;

[0064] The method for obtaining the first mapping relationship includes: conducting 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 based on the collision parameters and the predicted horizontal coordinate value; wherein the collision parameters include height information and movement information.

[0065] By inputting different collision parameters (a first relative speed value, a second relative speed value, a current horizontal coordinate value, and a height value of a pedestrian), simulating the landing point of a hit pedestrian's head on the vehicle, and outputting the corresponding predicted horizontal coordinate value, a first mapping relationship can be obtained; before the vehicle hits the pedestrian, the first horizontal coordinate information of the landing point of the hit pedestrian's head on the vehicle can be calculated through 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.

[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 based on the obtained first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value, in combination with the pre-stored first mapping relationship, and uses the obtained corresponding predicted horizontal coordinate value as the first horizontal coordinate information.

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

[0069] Option 1:

[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 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;

[0071] The vehicle parameter information includes the vehicle body coordinate area parameters in the horizontal plane 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 calculations based on the received movement information and vehicle parameter information, and determines whether the vehicle will hit the pedestrian in front based on the calculation results. If it is determined that the vehicle will hit the pedestrian in front, it proceeds to step 2; if it is determined that the vehicle will not hit the pedestrian in front, it repeats step 1;

[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 plane coordinate system according to the received height information and movement information and the pre-stored first mapping relationship.

[0075] Among them, the specific method of calculating and judging whether the vehicle will hit the pedestrian in front based on the first relative speed value, the second relative speed value, the current horizontal coordinate value and the vehicle body coordinate area parameters belongs to a conventional mathematical algorithm and is common knowledge in the professional and technical field. In principle, it is only necessary to calculate and predict the motion trajectory of the pedestrian in the horizontal plane coordinate system (that is, calculate and obtain the movement function of the pedestrian) based on the first relative speed value, the second relative speed value and the current horizontal coordinate value, and then, based on the motion trajectory and the vehicle body coordinate area parameters, by judging whether the motion trajectory of the pedestrian will partially overlap with the vehicle body area, it is possible to judge whether the vehicle will hit the pedestrian in front.

[0076] Option 2:

[0077] 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;

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

[0079] The acquisition module also acquires the 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 hit the pedestrian in front includes the following steps:

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

[0082] 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;

[0083] 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.

[0084] Specifically, in the above-mentioned solution 2, 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 vehicle's braking system to perform emergency braking according to the received emergency braking information.

[0085] Specifically, in the above scheme 2, the minimum safe braking distance value is calculated using the following formula:

[0086] S=S1+Vt

[0087] Among them, 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 this embodiment 1, the initial detonation direction of the airbag mechanism is set to the front direction of the vehicle;

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

[0090] By setting the initial detonation direction for the airbag mechanism and setting the initial detonation 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 rotating mechanism, but also able to respond more quickly when the vehicle hits a child (children are shorter in height, and the point where their heads land on the vehicle when hit will be biased towards the front of the vehicle's front surround and the front side of the vehicle's hood cover).

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

[0092] By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis direction of the horizontal plane coordinate system to be parallel to the front and rear directions of the vehicle, setting the positive direction of the X-axis to the front direction of the vehicle, and setting the Y-axis direction of the horizontal plane coordinate system to be parallel to the left and right directions of the vehicle; the calculation of the first horizontal coordinate information can be simplified, and the calibration of the rotation position of the plane rotation mechanism can be further simplified.

[0093] Embodiment 2:

[0094] like Figure 6 and Figure 7 As shown, according to the detonation control method of the pedestrian airbag of a vehicle provided in Example 1, Example 2 provides a detonation control system of the pedestrian airbag of a vehicle, including: an 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 outer panel 1 of the vehicle's hood; the airbag unit 2 includes a planar rotating mechanism 21 installed at the rear end of the upper side of the outer panel 1 of the vehicle's hood, and an airbag mechanism 22 fixedly installed on the output end of the planar rotating mechanism.

[0095] Specifically, Figure 6 As shown, in this embodiment 2, the detonation control system of the pedestrian airbag of the vehicle also includes a decorative cover plate 3, which is fixedly mounted on the rear end of the upper side of the hood outer panel 1, and the plane rotating mechanism 21 and the airbag mechanism 22 are both mounted between the decorative cover plate and the hood outer panel.

[0096] Specifically, Figure 6 and Figure 7 As shown, in this embodiment 2, the plane 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 bracket 223;

[0097] The gas generator 221 is fixedly mounted on the output end of the motor shaft 212; the airbag 222 is mounted on the gas generator 221, and the airbag bracket 223 is fixedly mounted on the rear end of the upper side of the hood outer panel 1. The airbag bracket 223 is used to guide the rotation of the airbag, and the servo motor 211 is used to drive the gas generator 221 to rotate in a horizontal plane through the motor shaft 212 to adjust the detonation direction of the airbag 222 in the horizontal plane.

[0098] The detonation control method and system of the pedestrian airbag of a vehicle provided by the present invention have at least the following technical effects or advantages:

[0099] 1. The detonation control method of the pedestrian airbag of the vehicle provided by the present invention 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, according to the received target angle information, the plane rotation mechanism is controlled to drive the airbag mechanism to rotate the detonation direction to the target detonation direction in the horizontal plane, and then the airbag mechanism is controlled to detonate the airbag. The detonation control method of the pedestrian airbag of the vehicle provided by the present invention can accurately control the detonation direction of the airbag mechanism in the horizontal plane by predicting the landing point 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 costs; it solves the technical problems that the existing pedestrian airbag system usually has the problems of low airbag utilization rate and high installation and maintenance costs.

[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 landing point of the head of the hit pedestrian on the vehicle is simulated, and the corresponding predicted horizontal coordinate value is output to obtain the first mapping relationship; 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 through the first mapping relationship and the obtained collision parameters of the pedestrian, and then the landing point of the pedestrian's head on the vehicle can be predicted in advance.

[0101] 3. By setting the initial detonation direction for the airbag mechanism and setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, it is not only convenient to calibrate the rotation position of the plane rotating mechanism, but also to respond more quickly when the vehicle hits a child (children are shorter and their heads will fall toward the front of the vehicle and the front side of the vehicle hood cover when hit).

[0102] 4. By setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle, setting the X-axis direction of the horizontal plane coordinate system to be parallel to the front and rear directions of the vehicle, setting the positive direction of the X-axis to the front direction of the vehicle, and setting the Y-axis direction of the horizontal plane coordinate system to be parallel to the left and right directions of the vehicle; the calculation of the first horizontal coordinate information can be simplified, and the calibration of the rotation position of the plane rotation mechanism can be further simplified.

[0103] The above are only specific application examples of the present invention and do not constitute any limitation to the protection scope of the present invention. Any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A method for controlling the detonation of a pedestrian airbag of a vehicle, characterized in that: include: The collecting module collects 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, and sends the collected height information and movement information to the processing module; Using the processing module to determine whether the vehicle will hit a pedestrian in front according to the pre-stored vehicle parameter information and the received movement information; When it is determined that the vehicle will hit the pedestrian in front, first horizontal coordinate information of the point where the head of the hit pedestrian falls on the vehicle in the horizontal plane coordinate system is calculated based on the received height information and the movement information and the pre-stored first mapping relationship; The processing module calculates target angle information of the airbag unit according to 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 plane rotating mechanism installed at the rear end of the upper side of the hood outer panel of the vehicle, and the airbag mechanism fixedly installed on the output end of the plane rotating mechanism; The control module controls the plane 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 detonation of a pedestrian airbag of a vehicle according to claim 1, characterized in that: 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 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; The method for obtaining the first mapping relationship includes: conducting 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 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 detonation of a pedestrian airbag of a vehicle according to claim 2, characterized in that: 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 the movement information; The processing module obtains a corresponding predicted horizontal coordinate value based on the obtained first relative speed value, the second relative speed value, the current horizontal coordinate value and the height value, in combination 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 detonation of a pedestrian airbag of a vehicle according to claim 1, characterized in that: 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 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; The vehicle parameter information includes vehicle body coordinate area parameters of the vehicle in the horizontal plane coordinate system; The method for the processing module to determine whether the vehicle will hit the pedestrian in front includes the following steps: Step 1: The processing module performs calculations based on the received movement information and the vehicle parameter information, and determines whether the vehicle will hit the pedestrian in front according to the calculation results. If it is determined that the vehicle will hit the pedestrian in front, the process proceeds to step 2; if it is determined that the vehicle will not hit the pedestrian in front, step 1 is repeated. 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 plane coordinate system according to the received height information and the movement information and the pre-stored first mapping relationship.

5. The method for controlling the detonation of a pedestrian airbag of a vehicle according to claim 1, characterized in that: 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 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 plane coordinate system; The vehicle parameter information includes a braking deceleration value of the vehicle; 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; The method for the processing module to determine whether the vehicle will hit the pedestrian in front includes the following steps: Step 1: The processing module calculates the braking distance value and braking time value of the vehicle according to the vehicle parameter information and the current speed information; 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; 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 detonation of a pedestrian airbag of a vehicle according to claim 5, characterized in that: 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 vehicle's braking system to perform emergency braking according to the received emergency braking information.

7. The method for controlling the detonation of a pedestrian airbag of a vehicle according to claim 5, characterized in that: The minimum safe braking distance value is calculated using the following formula: S=S1+Vt Among them, 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 detonation of a pedestrian airbag of a vehicle according to claim 1, characterized in that: Setting the initial detonation direction of the airbag mechanism to the front direction of the vehicle; The control module is used to control the plane rotation mechanism according to the received target angle information to drive the airbag mechanism to rotate from the initial detonation direction to the target detonation direction in the horizontal plane.

9. A detonation control system for a pedestrian airbag of a vehicle, characterized in that: include: A collection module, a processing module and a control module installed on the vehicle, a plane rotating mechanism installed at the rear end of the upper side of the hood outer panel of the vehicle, and an airbag mechanism fixedly installed on the output end of the plane rotating mechanism; The pedestrian airbag system of the vehicle is used to execute the steps in the detonation control method of the pedestrian airbag of the vehicle according to any one of claims 1 to 8.

10. The detonation control system for a pedestrian airbag of a vehicle according to claim 9, characterized in that: It also includes a decorative cover plate, which is fixedly mounted on the rear end of the upper side of the hood outer panel, and the plane rotating mechanism and the airbag mechanism are both mounted between the decorative cover plate and the hood outer panel.

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