Automotive airbag control method

Abstract

The application provides a car safety airbag control method. The car safety airbag control method comprises: (1) collecting the impact force sensed by flexible array pressure sensors arranged on the outer surface of the car shell when the vehicle collides; based on the impact force and the impact time when the vehicle collides, the processor calculates the total impulse size generated by the vehicle collision; (2) based on the total impulse size generated by the vehicle collision, the processor calculates the partial impulse in three directions in the three-dimensional space. The car safety airbag control method is: a set of safety airbags for safety protection in three directions are arranged in the car; a set of flexible array pressure sensors for sensing vehicle collision are arranged on the car shell; when the vehicle collision occurs, the partial impulse in three directions is calculated by using the car safety airbag control method, and if the partial impulse in any three directions reaches the airbag deployment threshold in the corresponding direction, the processor deploys the safety airbag to perform safety protection in the corresponding direction.

Description

Technical Field

[0001] This invention belongs to the field of airbag technology, specifically relating to a method for controlling automotive airbags. Background Technology

[0002] With social development, vehicles play an irreplaceable role in people's transportation. In the event of an accident, car airbags can protect the driver or passengers from the impact caused by a vehicle collision, thus greatly protecting the personal safety of the driver and passengers.

[0003] Currently, car manufacturers generally have several requirements for airbag deployment:

[0004] 1. Speed ​​requirement: The vehicle speed must be above a certain range, such as 50km / h or 60km / h. The specific value may vary depending on the manufacturer. If the vehicle speed is below this range, the airbags will usually not deploy.

[0005] 2. Impact point requirements: The impact point must be near the airbag sensors, typically directly in front of the vehicle or on the side of the wheel arch. The airbags will only deploy if an impact occurs at these locations.

[0006] 3. Impact Object Requirements: The impact object must be hard and have impact force, such as a car or a wall. If a small object touches the sensor, it usually will not trigger the airbag to deploy.

[0007] Given the numerous limitations on airbag deployment, this invention proposes a collision analysis algorithm and automotive safety control device based on a capacitive matrix flexible sensor. This algorithm accurately determines the source of force on the vehicle, overcoming the limitations of traditional airbag deployment conditions. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for controlling automotive airbags.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] In a first aspect, the present invention provides a method for controlling an automotive airbag, comprising:

[0011] (1) Collect the impact force of the vehicle collision sensed by the flexible array pressure sensor set on the outer surface of the car body; calculate the magnitude of the impulse generated by the vehicle collision based on the impact force and impact time.

[0012] Let F be the impact force sensed by the flexible array pressure sensor during a vehicle collision, and let i be the impact points 1, 2, 3...i across the entire impact area of ​​the flexible array pressure sensor; let I be the total impulse generated by the vehicle collision.

[0013] I = F1*T1 + F2*T2 + ... + F i *T i

[0014] i represents the impact points of i flexible array pressure sensors, F i For the impact point data of the i-th flexible array pressure sensor, T i The impact duration of the i-th flexible array pressure sensor impact point;

[0015] (2) Based on the total impulse generated by the vehicle collision, calculate the impulse components in the X, Y, and Z directions in three-dimensional space;

[0016] I x =I*cosα*L*(1- )

[0017] I y =I*cosβ*L*(1-λ)

[0018] I z =I*cosγ*L*(1-μ)

[0019] L is the distance from the point of impact to the airbag; α, β, and γ are the angles between the point of impact and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact;

[0020] The deployment of the airbag is controlled by the impulse in the X, Y, and Z directions in three-dimensional space, as calculated.

[0021] In a second aspect, the present invention provides a method for controlling an automotive airbag, comprising:

[0022] (1) Collect the impact deformation of the vehicle during the collision as sensed by the flexible array pressure sensor set on the inner surface of the car body; calculate the magnitude of the impact energy generated by the vehicle collision based on the impact deformation during the collision.

[0023] Suppose that the flexible array pressure sensor has 1, 2, 3...j deformation points across its entire deformation area; because the impact deformation crease causes changes in the flexible array pressure sensor, the sensed value P at the j-th deformation point... j This corresponds to the degree of deformation of the crease at this location;

[0024] ① For a flat car body, the degree of deformation is approximately proportional to the impact energy W it experiences at that point. j =k1P j k1 is the conversion factor;

[0025] The total impact energy W is:

[0026] W = W1 + W2 + ... + W j

[0027] ② For a non-flat car body, the sensing value P at the j-th deformation point j Calculate the bending angle θ at each deformation point. j =k2P j k2 is the conversion factor;

[0028] Based on the bending angles of all deformation points and the distances between deformation points, the three-dimensional model of the deformed car body is reconstructed, and compared with the original three-dimensional model of the car body that has not been impacted, the total deformation Q of the car body is calculated.

[0029] The total deformation Q is approximately proportional to the total impact energy W = k3Q, where k3 is a reduction factor.

[0030] (2) Based on the total impact energy borne, the impact energy in the three directions of X, Y and Z in three-dimensional space is calculated;

[0031] W x =W*cosα*L*(1- )

[0032] W y =W*cosβ*L*(1-λ)

[0033] W z =W*cosγ*L*(1-μ)

[0034] L is the distance from the deformation point to the airbag; α, β, and γ are the angles between the deformation point and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact;

[0035] The deployment of the airbag is controlled by the impulse in the X, Y, and Z directions in three-dimensional space, as calculated.

[0036] Thirdly, the present invention provides a method for controlling an automotive airbag, comprising:

[0037] A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions;

[0038] A set of flexible array pressure sensors is installed on the car body to detect vehicle collisions;

[0039] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impulses I in the X, Y, and Z directions. x I y I zIf the impulse component I in any of the three directions X, Y, Z x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0040] or:

[0041] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impact energy W in the X, Y, and Z directions. x W y W z If the impact energy W is distributed in any three directions X, Y, Z x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0042] Fourthly, the present invention provides a method for controlling an automotive airbag, comprising:

[0043] A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2.

[0044] m sets of flexible array pressure sensors are installed on the car body to sense vehicle collisions, where m ≥ 2;

[0045] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n];

[0046] Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size:

[0047]

[0048]

[0049]

[0050] If the total impulse in any X, Y, Z direction of any group of flexible array pressure sensors is I x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0051] or:

[0052] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n];

[0053] Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size:

[0054]

[0055]

[0056]

[0057] If the total impact energy W in any X, Y, Z direction of any group of flexible array pressure sensors is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0058] Fifthly, the present invention provides a method for controlling an automotive airbag, comprising:

[0059] A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions;

[0060] A set of flexible array pressure sensors for sensing vehicle collisions is installed on both the outer and inner surfaces of the vehicle body.

[0061] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impulses I in the X, Y, and Z directions of the flexible array pressure sensors on the outer surface of the vehicle body. x I y I z Simultaneously, the aforementioned automotive airbag control method is used to calculate the partial impact energy W in the X, Y, and Z directions of the flexible array pressure sensor on the inner surface of the vehicle shell. x W y W z ;

[0062] If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags in the corresponding direction are deployed;

[0063] If the magnitude W of the impact energy in any X, Y, Z direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags in the corresponding direction are deployed;

[0064] If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2 Meanwhile, the magnitude W of the impact energy in the corresponding direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 Deploy the airbags in the corresponding direction;

[0065] Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2 Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

[0066] Sixthly, the present invention provides a method for controlling an automotive airbag, comprising:

[0067] A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2.

[0068] m sets of flexible array pressure sensors for sensing vehicle collisions are installed on both the outer and inner surfaces of the vehicle body, where m ≥ 2;

[0069] When a vehicle collision occurs, the aforementioned automotive airbag control method is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the outer surface of the vehicle body. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n];

[0070] Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size:

[0071]

[0072]

[0073]

[0074] Simultaneously, the aforementioned automotive airbag control method is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the inner surface of the vehicle body. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n];

[0075] Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size:

[0076]

[0077]

[0078]

[0079] If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, Z direction... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags deploy, they provide safety protection in the corresponding direction.

[0080] If the total impact energy W of any group of flexible array pressure sensors on the inner surface of the car body in any X, Y, Z direction is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags deploy, they provide safety protection in the corresponding direction.

[0081] If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, Z direction... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2 Meanwhile, the total impact energy W in the corresponding direction of any group of flexible array pressure sensors on the inner surface of the car body... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 The airbags deploy to provide safety protection in the corresponding direction.

[0082] Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1 W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

[0083] In a seventh aspect, the present invention provides an automotive airbag control device, comprising:

[0084] Airbags are used to provide safety protection in the X, Y, and Z directions respectively;

[0085] Flexible array pressure sensors are mounted on the car body to detect vehicle collisions;

[0086] Airbag actuator, configured to deploy airbags; and

[0087] The processor, configured as follows:

[0088] The airbag deployment method described above is used to determine the deployment of the airbag for safety protection.

[0089] When it is determined that the airbags will deploy, control the airbag actuators.

[0090] Eighthly, the present invention provides a car equipped with the aforementioned car airbag control device.

[0091] This invention has outstanding substantive features and significant progress compared to the prior art, specifically:

[0092] This invention uses a flexible array of pressure sensors to sense the impact force or deformation during a vehicle collision, accurately determining the source of the force and overcoming the limitations of traditional airbag deployment conditions. By analyzing the magnitude of the impact force or deformation experienced by different seats, the airbag deployment threshold can be precisely determined, improving the safety of occupants in each seat according to different situations. In the event of a vehicle collision, the extent of damage can be assessed based on the magnitude of the impact force or deformation, eliminating the need for visual inspection and facilitating the discovery of hidden safety hazards. This information can also serve as a valuable reference for future vehicle repairs. Attached Figure Description

[0093] Figure 1 This is a force analysis diagram of a single flexible array pressure sensor.

[0094] Figure 2 This is an installation diagram of a flexible array pressure sensor at the A, B, and C pillars of a car body.

[0095] Figure 3 This is a diagram showing the installation of a flexible array pressure sensor at the door position on the car body.

[0096] Figure 4This is a diagram showing the installation of a flexible array pressure sensor at the wheel position on a car body.

[0097] Figure 5 This is a diagram showing the installation of a flexible array pressure sensor at the front bumper beam of a car body.

[0098] Figure 6 This is a diagram showing the installation of a flexible array pressure sensor at the rear bumper beam of a car body.

[0099] Figure 7 This is a diagram showing the installation of a flexible array pressure sensor on the roof of a car body.

[0100] Figure 8 This is a schematic diagram of the structure of a flexible array pressure sensor.

[0101] Figure 9 A circuit schematic of a pressure signal processing module is shown.

[0102] Figure 10 A circuit schematic of a processor is shown. Detailed Implementation

[0103] Example 1

[0104] This embodiment provides a method for controlling automotive airbags, including:

[0105] (1) Collect the impact force of the vehicle collision sensed by the flexible array pressure sensor set on the outer surface of the car body; calculate the magnitude of the impulse generated by the vehicle collision based on the impact force and impact time.

[0106] Let F be the impact force sensed by the flexible array pressure sensor during a vehicle collision, and let i be the impact points 1, 2, 3...i across the entire impact area of ​​the flexible array pressure sensor; let I be the total impulse generated by the vehicle collision.

[0107] I = F1*T1 + F2*T2 + ... + F i *T i

[0108] i represents the impact points of i flexible array pressure sensors, F i For the impact point data of the i-th flexible array pressure sensor, T i The impact duration of the i-th flexible array pressure sensor impact point;

[0109] (2) During a collision, the impact analysis at the point of impact is as follows: During the collision, the car body and metal will absorb some energy. Due to differences in vehicles, frame steel, and the absorption of energy in the X, Y, and Z directions (which can be denoted as...), the energy will be distributed as follows: Since the values ​​of λ and μ are different, the impact force received by the vehicle at the point of impact is different from that at the farthest point from the impact point. Therefore, based on the total impulse generated by the vehicle collision, the impulse components in the X, Y, and Z directions in three-dimensional space can be calculated, such as... Figure 1 As shown;

[0110] I x =I*cosα*L*(1- )

[0111] I y =I*cosβ*L*(1-λ)

[0112] I z =I*cosγ*L*(1-μ)

[0113] L is the distance from the point of impact to the airbag; α, β, and γ are the angles between the point of impact and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact;

[0114] The deployment of the airbag is controlled by the impulse in the X, Y, and Z directions in three-dimensional space, as calculated.

[0115] Example 2

[0116] This embodiment provides a method for controlling automotive airbags, including:

[0117] (1) Collect the impact deformation of the vehicle during the collision as sensed by the flexible array pressure sensor set on the inner surface of the car body; calculate the magnitude of the impact energy generated by the vehicle collision based on the impact deformation during the collision.

[0118] Suppose that the flexible array pressure sensor has 1, 2, 3...j deformation points across its entire deformation area; because the impact deformation crease causes changes in the flexible array pressure sensor, the sensed value P at the j-th deformation point... j This corresponds to the degree of deformation of the crease at this location;

[0119] ① For a flat car body, the degree of deformation is approximately proportional to the impact energy W it experiences at that point. j =k1P j k1 is the conversion factor;

[0120] The total impact energy W is:

[0121] W = W1 + W2 + ... + W j

[0122] ② For a non-flat car body, the sensing value P at the j-th deformation point j Calculate the bending angle θ at each deformation point.j =k2P j k2 is the conversion factor;

[0123] Based on the bending angles of all deformation points and the distances between deformation points, the three-dimensional model of the deformed car body is reconstructed, and compared with the original three-dimensional model of the car body that has not been impacted, the total deformation Q of the car body is calculated.

[0124] The total deformation Q is approximately proportional to the total impact energy W = k3Q, where k3 is a reduction factor.

[0125] (2) During a collision, the impact analysis at the point of impact is as follows: During the collision, the car body and metal will absorb some energy. Due to differences in vehicles, frame steel, and the absorption of energy in the X, Y, and Z directions (which can be denoted as...), the energy will be distributed as follows: Since the values ​​of λ and μ are different, the impact energy received by the vehicle at the point of impact is different from that received at the farthest point from the impact point. Therefore, based on the total impact energy received, the impact energy in the X, Y, and Z directions in three-dimensional space is calculated.

[0126] W x =W*cosα*L*(1- )

[0127] W y =W*cosβ*L*(1-λ)

[0128] W z =W*cosγ*L*(1-μ)

[0129] L is the distance from the deformation point to the airbag; α, β, and γ are the angles between the deformation point and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact;

[0130] The deployment of the airbag is controlled by the impulse in the X, Y, and Z directions in three-dimensional space, as calculated.

[0131] Example 3

[0132] This embodiment provides a method for controlling automotive airbags, including:

[0133] A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions;

[0134] A set of flexible array pressure sensors is installed on the car body to detect vehicle collisions;

[0135] When a vehicle collision occurs, the partial impulse I in the X, Y, and Z directions is calculated using the vehicle airbag control method described in Example 1.x I y I z If the impulse component I in any of the three directions X, Y, Z x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0136] Example 4

[0137] The difference between this embodiment and embodiment 3 is as follows:

[0138] When a vehicle collision occurs, the partial impact energy W in the X, Y, and Z directions is calculated using the vehicle airbag control method described in Example 2. x W y W z If the impact energy W is distributed in any three directions X, Y, Z x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0139] Example 5

[0140] A car has a set of sensors installed on each separate load-bearing structure, totaling m sets, based on its shell and body structure. An airbag is installed for the nth occupant seat, also totaling n sets. Generally, m >= n. Because the car body structure can transmit the force and energy of external impacts, even an impact relatively far from a seat can still cause injury to the occupant in that seat if the impact is strong enough. Therefore, it is necessary to calculate the impact intensity (impulse and energy) detected by each set of sensors, calculate the effective value of the impulse and energy transmitted to the specific seat from each set of sensors, and calculate the sum of the effective values ​​for all sets. Based on whether the sum reaches a threshold, it is determined whether the airbag needs to deploy.

[0141] This embodiment provides a method for controlling automotive airbags, including:

[0142] A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2.

[0143] m sets of flexible array pressure sensors are installed on the car body to sense vehicle collisions, where m ≥ 2;

[0144] When a vehicle collision occurs, the vehicle airbag control method described in Example 1 is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n];

[0145] Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size:

[0146]

[0147]

[0148]

[0149] If the total impulse in any X, Y, Z direction of any group of flexible array pressure sensors is I x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction.

[0150] In this embodiment, the calculation of each value is explained by taking "two sets of airbags are installed in the driver and front passenger seats of the vehicle, and a set of flexible array pressure sensors are installed at the A and B pillars respectively, i.e., m=4, n=2".

[0151] The distance from the i-th group of flexible array pressure sensors to the j-th seat is L. ij The four sets of flexible array pressure sensors are eight distances from each of the two seats, namely: L 11 L 12 L 21 L 22 L 31 L 32 L 41 L 42 A total of 8 distance values ​​are calculated. Because the distances from the flexible array pressure sensors to each occupant's seat are different, the angles α, β, and γ between the deformed part of the flexible array pressure sensor and the airbag, and the momentum (kinetic energy) loss coefficient, are also considered. λ and μ also change synchronously. Therefore, each of the above parameters has multiple different cases (sub-parameter values), denoted as α. ij , ß ijγ ij , ij , λ ij μ ij Because the car body structure is fixed, these six sets of parameters seem complicated, but they can be obtained through experiments before the car leaves the factory.

[0152] When a collision occurs, the impulses I1, I2, I3, and I4 of four flexible array pressure sensors are first acquired.

[0153] Next, the partial impulse I transmitted to each airbag in the X, Y, and Z directions is calculated. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n]:

[0154] I x(11) =I1*cosα 11 *L 11 *(1- 11 )

[0155] I y(11) =I1*cosβ 11 *L 11 *(1-λ 11 )

[0156] I z(11) =I1*cosγ 11 *L 11 *(1-μ 11 )

[0157] I x(12) =I1*cosα 12 *L 12 *(1- 12 )

[0158] I y(12) =I1*cosβ 12 *L 12 *(1-λ 12 )

[0159] I z(12) =I1*cosγ 12 *L 12 *(1-μ 12 )

[0160] I x(21) =I2*cosα 21 *L 11 *(1- 21 )

[0161] I y(21) =I2*cosβ 21 *L 11 *(1-λ 21 )

[0162] I z(21) =I2*cosγ 21 *L 21 *(1-μ 21 )

[0163] I x(22) =I2*cosα 22 *L 22 *(1- 22 )

[0164] I y(22) =I2*cosβ 22 *L 22 *(1-λ 22 )

[0165] I z(22) =I2*cosγ 22 *L 22 *(1-μ 22 )

[0166] I x(31) =I3*cosα 31 *L 31 *(1- 31 )

[0167] I y(31) =I3*cosβ 31 *L 31 *(1-λ 31 )

[0168] I z(31) =I3*cosγ 31 *L 31 *(1-μ 31 )

[0169] I x(32) =I3*cosα 32 *L 32 *(1- 32 )

[0170] I y(32) =I3*cosβ 32 *L 32 *(1-λ 32 )

[0171] I z(32) =I3*cosγ 32 *L 32 *(1-μ 32 )

[0172] I x(41) =I4*cosα 41 *L 41 *(1- 41 )

[0173] I y(41) =I4*cosβ 41 *L 41 *(1-λ 41 )

[0174] I z(41) =I4*cosγ 41 *L 41 *(1-μ 41 )

[0175] I x(42) =I4*cosα 42 *L 42 *(1- 42 )

[0176] I y(42) =I4*cosβ 42 *L 42 *(1-λ 42 )

[0177] I z(42) =I4*cosγ 42 *L 42 *(1-μ 42 )

[0178] Next, for each passenger seat, calculate the total amount I of the partial impulse experienced by the j-th seat in each of the three directions. x(j) I y(j) I z(j) ;

[0179] I x(1) =I x(11) +I x(21) +I x(31) +I x(41)

[0180] I x(2) =I x(12) +I x(22) +I x(32) +I x(42)

[0181] I y(1) =I y(11) +I y(21) +I y(31) +I y(41)

[0182] I y(2) =I y(12) +I y(22) +I y(32) +I y(42)

[0183] I z(1) =I z(11) +I z(21) +I z(31) +I z(41)

[0184] I z(2) =I z(12) +I z(22) +I z(32) +I z(42) .

[0185] Example 6

[0186] The difference between this embodiment and embodiment 5 is as follows:

[0187] When a vehicle collision occurs, the vehicle airbag control method described in Example 2 is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n];

[0188] Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size:

[0189]

[0190]

[0191]

[0192] If the total impact energy W in any X, Y, Z direction of any group of flexible array pressure sensors is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' zWhen the airbags deploy, they provide safety protection in the corresponding direction.

[0193] Example 7

[0194] This embodiment provides a method for controlling automotive airbags, including:

[0195] A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions;

[0196] A set of flexible array pressure sensors for sensing vehicle collisions is installed on both the outer and inner surfaces of the vehicle body.

[0197] When a vehicle collision occurs, the vehicle airbag control method described in Example 1 is used to calculate the partial impulses I in the X, Y, and Z directions of the flexible array pressure sensor on the outer surface of the vehicle body. x I y I z Simultaneously, the vehicle airbag control method described in Example 2 is used to calculate the partial impact energy W in the X, Y, and Z directions of the flexible array pressure sensor on the inner surface of the vehicle shell. x W y W z ;

[0198] If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags in the corresponding direction are deployed;

[0199] If the magnitude W of the impact energy in any X, Y, Z direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags in the corresponding direction are deployed;

[0200] If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2Meanwhile, the magnitude W of the impact energy in the corresponding direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 Deploy the airbags in the corresponding direction;

[0201] Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1 W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2 Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

[0202] Example 8

[0203] This embodiment provides a method for controlling automotive airbags, including:

[0204] A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2.

[0205] m sets of flexible array pressure sensors for sensing vehicle collisions are installed on both the outer and inner surfaces of the vehicle body, where m ≥ 2;

[0206] When a vehicle collision occurs, the vehicle airbag control method described in Example 1 is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the outer surface of the vehicle body. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n];

[0207] Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size:

[0208]

[0209]

[0210]

[0211] Simultaneously, the automotive airbag control method described in Example 2 is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the inner surface of the vehicle body. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n];

[0212] Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size:

[0213]

[0214]

[0215]

[0216] If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, Z direction... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags deploy, they provide safety protection in the corresponding direction.

[0217] If the total impact energy W of any group of flexible array pressure sensors on the inner surface of the car body in any X, Y, Z direction is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags deploy, they provide safety protection in the corresponding direction.

[0218] If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, Z direction... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2 Meanwhile, the total impact energy W in the corresponding direction of any group of flexible array pressure sensors on the inner surface of the car body... x(j) W y(j) Wz(j) Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 The airbags deploy to provide safety protection in the corresponding direction.

[0219] Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1 W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2 Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

[0220] Example 9

[0221] This embodiment provides an automotive airbag control device, including:

[0222] Airbags are used to provide safety protection in the X, Y, and Z directions respectively;

[0223] Flexible array pressure sensors are mounted on the car body to detect vehicle collisions;

[0224] Airbag actuator, configured to deploy airbags; and

[0225] The processor, configured as follows:

[0226] The deployment of the airbag is determined based on the vehicle airbag control method described in any one of Examples 3-8 for safety protection;

[0227] When it is determined that the airbags will deploy, control the airbag actuators.

[0228] Specifically, such as Figures 2-7 As shown, the flexible array pressure sensor can be installed at any combination of the A-pillar, B-pillar, C-pillar, door, wheel, front and rear anti-collision beams and roof of the car body. The specific number and location of the flexible array pressure sensor depend on the specific requirements.

[0229] In other exemplary embodiments, the airbag includes three airbag components arranged in the X, Y, and Z directions. When an impact occurs and the impact in one direction is large enough to reach a certain threshold, only the airbag component in that direction will deploy, while the other two airbag components will not deploy.

[0230] The flexible array pressure sensor described in this embodiment, such as Figure 8 As shown, it includes a top insulating layer 1, a top conductive layer 2, an elastic dielectric layer 3, a bottom conductive layer 4, and a bottom insulating layer 5 arranged from top to bottom;

[0231] The conductive materials of the top conductive layer 2 and the bottom conductive layer 4 are respectively arranged in a horizontal row and a vertical column with gaps. The intersection of the top conductive layer 2 and the bottom conductive layer 4 constitutes a capacitive sensing point. When subjected to force, the elastic medium layer 3 changes, causing the capacitance signal of the sensor matrix plane composed of the capacitive sensing points to change.

[0232] One end of the conductive material in the horizontal row of the top conductive layer 2 serves as the first electrical signal output terminal.

[0233] One end of the vertical Col column conductive material of the bottom conductive layer 4 serves as the second electrical signal output terminal.

[0234] The flexible array pressure sensor is used to sense pressure on the following principle:

[0235] The top conductive layer 2 and the bottom conductive layer 4 are arranged with vertical Col columns and horizontal Row rows, respectively (the spacing between Row rows and Col columns can be adjusted to the millimeter level as needed). An elastic dielectric layer 4 lies between the two conductive layers. Capacitive sensing points are formed at the intersections of the top conductive layer 2, the elastic dielectric layer 3, and the bottom conductive layer 4, constituting a Col*Row array of capacitive sensors. According to the capacitance calculation formula C=εS / 4πkd (where ε is the relative permittivity, S is the area of ​​the capacitor plates facing each other, d is the distance between the capacitor plates, and k is the electrostatic constant), when force is applied, the elastic dielectric layer 4 changes, causing a change in the capacitance signal of the capacitive sensing points formed by the top conductive layer 2 and the bottom conductive layer 4. This change in capacitance signal can be converted into a pressure signal through signal processing.

[0236] In some exemplary instances, for isolation and protection, the flexible capacitive matrix sensor may further include a top protective layer 6 disposed above the top insulating layer and a bottom protective layer 7 disposed below the bottom insulating layer.

[0237] In some exemplary instances, an adhesive layer 8 is also included below the bottom protective layer for easy application.

[0238] In some exemplary embodiments, the dielectric layer can be any of silicone rubber, TPU, or TPE. The conductive layer can be any or more of graphene slurry, graphite conductive adhesive, silver paste, or a mixture of carbon powder / carbon fiber / graphene and elastomer slurry. The insulating layer can be a composite material formed from a blend of cotton, polyester, nylon, and spandex with silicone, silicone rubber, TPU, or TPE. The specific materials and preparation processes used for the conductive and insulating layers are existing technologies.

[0239] In some exemplary instances, the flexible array pressure sensor may further include a pressure signal processing module;

[0240] The pressure signal processing module includes a capacitor acquisition circuit and a multi-channel analog electronic switch;

[0241] The first and second electrical signal output terminals of the flexible capacitive matrix sensor are respectively connected to the multi-channel analog electronic switch, and the multi-channel analog electronic switch is connected to the capacitance acquisition circuit.

[0242] The multi-channel analog electronic switch conducts the Row and Col columns of the flexible capacitive matrix sensor in a time-division manner, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit, and converts them into pressure signals or deformation signals.

[0243] The MCU processing module is connected to the pressure signal processing module and is used to receive pressure signals or deformation signals from the pressure signal processing module to obtain pressure distribution data or deformation data from the flexible capacitive matrix sensor. In other embodiments, when a vehicle collision occurs, the degree of vehicle damage can be determined based on the pressure distribution data or deformation data, eliminating the need for visual inspection and making it easier to identify hidden safety hazards. This can provide valuable information for later vehicle repairs.

[0244] Figure 9A circuit schematic of a pressure signal processing module is shown. The capacitance acquisition circuit U1 is a PMDS-F4 ultra-low power capacitance measurement chip, which can acquire real-time capacitance signals from a flexible capacitive matrix sensor via IIC or SPI communication. U2 and U3 are multi-channel analog electronic switches, which, by controlling S1 and S0 respectively, control the corresponding Col column and Row conductive materials to be connected to the common terminals 1Z and 2Z in a time-division manner. P1 is the signal input port for the Col column and Row of the flexible capacitive matrix sensor. The multi-channel analog electronic switches time-division conduct the rows and columns of the flexible capacitive matrix sensor, switching in a polling manner, with a sampling refresh rate of 50Hz and a fluctuation rate of 0.1pF. The capacitance signals of each sensing point on the sensor matrix plane are acquired by the capacitance acquisition circuit U6, and then converted into pressure signals through an internal preset algorithm. It should be noted that the preset algorithm here is a conventional technology in this field, utilizing the inherent application functions of the multi-channel analog electronic switches and the capacitance acquisition circuit U6, and does not involve new computer programs.

[0245] Figure 10 A circuit schematic of a processor is shown. The MCU control unit, consisting of U5 and peripheral devices, is used for data analysis, control signal output, and communication processing; U6 is an external storage unit that stores sensor and key data; U7 is a LIN communication unit that enables single-bus communication and is used to transmit various data from the automotive airbag control device to the vehicle's infotainment system.

[0246] Example 10

[0247] This embodiment provides a car equipped with the car airbag control device described in Embodiment 9.

[0248] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for controlling automotive airbags, characterized in that, include: (1) Safety airbags installed in the car to provide safety protection in the X, Y and Z directions respectively; The system collects the impact force during a vehicle collision from a flexible array of pressure sensors mounted on the outer surface of the vehicle body; and calculates the magnitude of the impulse generated by the vehicle collision based on the impact force and impact time. Let F be the impact force sensed by the flexible array pressure sensor during a vehicle collision, and let i be the impact points 1, 2, 3...i across the entire impact area of ​​the flexible array pressure sensor; let I be the total impulse generated by the vehicle collision. I=F1*T1+F2*T2+…+F i *T i i represents the impact points of i flexible array pressure sensors, F i For the impact point data of the i-th flexible array pressure sensor, T i The impact duration of the i-th flexible array pressure sensor impact point; (2) Based on the total impulse generated by the vehicle collision, calculate the impulse components in the X, Y, and Z directions in three-dimensional space; I x =I*cosα*L*(1- ) THE y =I*cosβ*L*(1-λ) AND z =I*cosγ*L*(1-μ) L is the distance from the point of impact to the airbag; α, β, and γ are the angles between the point of impact and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact; The calculated impulse in the X, Y, and Z directions within three-dimensional space controls the deployment of the airbags in the corresponding directions.

2. A method for controlling an automotive airbag, characterized in that, include: (1) Safety airbags installed in the car to provide safety protection in the X, Y and Z directions respectively; The system collects impact deformation data from a vehicle collision, which is sensed by a flexible array of pressure sensors installed on the inner surface of the vehicle body. Based on the impact deformation during the collision, the system calculates the magnitude of the impact energy generated by the vehicle collision. Suppose that the flexible array pressure sensor has 1, 2, 3...j deformation points across its entire deformation area; because the impact deformation crease causes changes in the flexible array pressure sensor, the sensed value P at the j-th deformation point... j This corresponds to the degree of deformation of the crease at this location; ① For a flat car body, the degree of deformation is approximately proportional to the impact energy W it experiences at that point. j =k1P j k1 is the conversion factor; The total impact energy W is: W=W1+W2+…+W j ② For a non-flat car body, the sensing value P at the j-th deformation point j Calculate the bending angle θ at each deformation point. j =k2P j k2 is the conversion factor; Based on the bending angles of all deformation points and the distances between deformation points, the three-dimensional model of the deformed car body is reconstructed, and compared with the original three-dimensional model of the car body that has not been impacted, the total deformation Q of the car body is calculated. The total deformation Q is approximately proportional to the total impact energy W = k3Q, where k3 is a reduction factor. (2) Based on the total impact energy borne, the impact energy in the three directions of X, Y and Z in three-dimensional space is calculated; W x =W*cosα*L*(1- ) W y =W*cosβ*L*(1-λ) IN z =W*cosγ*L*(1-μ) L is the distance from the deformation point to the airbag; α, β, and γ are the angles between the deformation point and the airbag. λ and μ are the momentum loss coefficients of the vehicle body steel frame in the x, y, and z axes during the impact; The deployment of airbags in the corresponding directions is controlled by the calculated impact energy in the X, Y, and Z directions within three-dimensional space.

3. A method for controlling automotive airbags, characterized in that, include: A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions; A set of flexible array pressure sensors is installed on the car body to detect vehicle collisions; When a vehicle collision occurs, the partial impulse I in the X, Y, and Z directions is calculated using the vehicle airbag control method described in claim 1. x I y I z If the impulse component I in any of the three directions X, Y, Z x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction. or: When a vehicle collision occurs, the partial impact energy W in the X, Y, and Z directions is calculated using the vehicle airbag control method described in claim 2. x W y W z If the impact energy W is distributed in any three directions X, Y, Z x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' z When the airbags deploy, they provide safety protection in the corresponding direction.

4. A method for controlling an automotive airbag, characterized in that, include: A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2. m sets of flexible array pressure sensors are installed on the car body to sense vehicle collisions, where m ≥ 2; When a vehicle collision occurs, the vehicle airbag control method described in claim 1 is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n]; Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size: If the total impulse in any X, Y, Z direction of any group of flexible array pressure sensors is I x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x 、I' y 、I' z When the airbags deploy, they provide safety protection in the corresponding direction. or: When a vehicle collision occurs, the vehicle airbag control method described in claim 2 is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n]; Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size: If the total impact energy W in any X, Y, Z direction of any group of flexible array pressure sensors is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x W' y W' z When the airbags deploy, they provide safety protection in the corresponding direction.

5. A method for controlling an automotive airbag, characterized in that, include: A set of airbags is installed in the car to provide safety protection in the X, Y, and Z directions; A set of flexible array pressure sensors for sensing vehicle collisions is installed on both the outer and inner surfaces of the vehicle body. When a vehicle collision occurs, the vehicle airbag control method described in claim 1 is used to calculate the partial impulses I in the X, Y, and Z directions of the flexible array pressure sensor on the outer surface of the vehicle body. x I y I z Simultaneously, the vehicle airbag control method described in claim 2 is used to calculate the partial impact energy W in the X, Y, and Z directions of the flexible array pressure sensor on the inner surface of the vehicle shell. x W y W z ; If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags in the corresponding direction are deployed; If the magnitude W of the impact energy in any X, Y, Z direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags in the corresponding direction are deployed; If the magnitude of the impulse in any X, Y, Z direction of the flexible array pressure sensor on the outer surface of the car body is I x I y I z Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2 Meanwhile, the magnitude W of the impact energy in the corresponding direction of the flexible array pressure sensor on the inner surface of the car body is... x W y W z Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 Deploy the airbags in the corresponding direction; Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1 W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2 Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

6. A method for controlling an automotive airbag, characterized in that, include: A car is equipped with n sets of airbags that provide safety protection in the X, Y, and Z directions, where n ≥ 2. m sets of flexible array pressure sensors for sensing vehicle collisions are installed on both the outer and inner surfaces of the vehicle body, where m ≥ 2; When a vehicle collision occurs, the vehicle airbag control method described in claim 1 is used to calculate the partial impulses I in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the outer surface of the vehicle body. x(ij) I y(ij) I z(ij) , i∈[1,m], j∈[1,n]; Calculate the total partial impulse I transmitted to each airbag in the X, Y, and Z directions. x(j) I y(j) I z(j) Size: Simultaneously, the vehicle airbag control method described in claim 2 is used to calculate the partial impact energy W in the X, Y, and Z directions sensed by m sets of flexible array pressure sensors on the inner surface of the vehicle body. x(ij) W y(ij) W z(ij) , i∈[1,m], j∈[1,n]; Calculate the total impact energy W transmitted to each airbag in the X, Y, and Z directions. x(j) W y(j) W z(j) Size: If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, and Z directions... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x1 、I' y1 、I' z1 When the airbags deploy, they provide safety protection in the corresponding direction. If the total impact energy W of any group of flexible array pressure sensors on the inner surface of the car body in any X, Y, Z direction is... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x1 W' y1 W' z1 When the airbags deploy, they provide safety protection in the corresponding direction. If the total impulse I of any group of flexible array pressure sensors on the outer surface of the car body in any X, Y, Z direction... x(j) I y(j) I z(j) Reaching the airbag deployment threshold I' in the corresponding direction x2 、I' y2 、I' z2 Meanwhile, the total impact energy W in the corresponding direction of any group of flexible array pressure sensors on the inner surface of the car body... x(j) W y(j) W z(j) Reaching the airbag deployment threshold W' in the corresponding direction x2 W' y2 W' z2 The airbags deploy to provide safety protection in the corresponding direction. Among them, the airbag deployment threshold W' x2 W' y2 W' z2 The corresponding value is less than the airbag deployment threshold W' x1 W' y1 W' z1 Airbag deployment threshold I' x2 、I' y2 、I' z2 Corresponding to less than the airbag deployment threshold I' x1 、I' y1 、I' z1 .

7. A vehicle airbag control device, characterized in that, include: Airbags are used to provide safety protection in the X, Y, and Z directions respectively; Flexible array pressure sensors are mounted on the car body to detect vehicle collisions; An airbag actuator configured to deploy an airbag; as well as The processor, configured as follows: The method for controlling the deployment of an automotive airbag according to any one of claims 3-6 is used to determine the deployment of the airbag for safety protection. When it is determined that the airbags will deploy, control the airbag actuators.

8. The automotive airbag control device according to claim 7, characterized in that: The flexible array pressure sensor can be installed at any combination of the A-pillar, B-pillar, C-pillar, door, wheel, front and rear anti-collision beams, and roof of the vehicle body.

9. The automotive airbag control device according to claim 7, characterized in that: The airbag includes three airbag components arranged in the X, Y, and Z directions.

10. A car, characterized in that: The vehicle airbag control device according to any one of claims 7-9 is provided.

Images