Occupant characteristic detection method, system and computer readable medium

Abstract

The present invention provides a method, system and computer-readable medium for detecting characteristics of an occupant, the method comprising: filling a first predetermined volume of gas into a seat cushion airbag, measuring a reference pressure formed by the first predetermined volume of gas when no occupant is seated; measuring a first pressure formed by the first predetermined volume of gas after an occupant is seated; obtaining a first weight according to the difference between the reference pressure and the first pressure, and using the first weight as the reference weight of the occupant. The present invention utilizes a seat cushion airbag arranged in a vehicle seat, and calculates the weight of the occupant and determines the seat position of the occupant by the difference in pressure of the seat cushion airbag when there is an occupant or not, thereby identifying the characteristics of the occupant without additionally setting a pressure sensor so as to set a targeted protection strategy for each occupant.

Description

Technical Field

[0001] The present invention relates to a detection method, a detection system and a storage medium for a vehicle, and in particular to an occupant feature detection method and system configured with a seat cushion airbag and a computer-readable medium. Background Art

[0002] With the development of the automobile industry, automatic driving or autonomous driving has become the mainstream research direction in the future. With the continuous advancement of automatic driving, the seating position of the occupants will present more possibilities. However, safety during driving has always been the top priority. In automatic driving or autonomous driving, the occupants' attention may not be focused on vehicle control or road environment. Therefore, when there are safety hazards, it may be difficult for the occupants to react in the first time. Therefore, automatic driving or autonomous driving is usually equipped with an occupant protection system to ensure the safety of the occupants in critical moments. However, the protection measures vary with the different body shapes and sitting postures of the occupants. In order to provide more targeted protection for the occupants, it is usually necessary to test the occupants' characteristics, such as weight, after the occupants are seated, so as to set up more targeted and effective protection strategies for the occupants.

[0003] There are already some methods for detecting weight and sitting posture, such as installing a pressure sensor in the seat to obtain the weight of the occupant, and obtaining the occupant's sitting posture through pressure distribution, such as whether the occupant is sitting forward or backward, etc. However, this method that relies on pressure sensors is costly and will also affect the comfort of the seat. In addition, due to the different body shapes and postures of occupants, the measurement results that rely solely on pressure sensors are not always accurate. Summary of the invention

[0004] In order to solve the defects in the prior art that the acquisition of occupant characteristic parameters relies on pressure sensors, which increases the cost of seats and also causes certain errors in detection results, the present invention provides an occupant characteristic detection method, system and computer-readable medium that utilize the seat cushion airbag to detect occupant characteristics, have high accuracy and do not require additional costs.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A method for detecting occupant characteristics, comprising:

[0007] S101: Filling a seat cushion airbag with a first predetermined volume of gas, and measuring a reference pressure formed by the first predetermined volume of gas when no occupant is seated;

[0008] S102: detecting that an occupant is seated, and measuring a first pressure formed by the first predetermined volume of gas;

[0009] S103: Obtaining a first weight according to a difference between the reference pressure and the first pressure, and using the first weight as a reference weight of the occupant.

[0010] The present invention also provides a method for detecting occupant characteristics, which is characterized in that it includes:

[0011] S101: Filling a seat cushion airbag with a first predetermined volume of gas, and measuring a reference pressure formed by the first predetermined volume of gas when no occupant is seated;

[0012] S102: measuring a first pressure formed by the first predetermined volume of gas after an occupant is seated; and obtaining a body shape of the occupant and obtaining a second weight according to the body shape;

[0013] S103: Obtaining a first weight according to a difference between the reference pressure and the first pressure;

[0014] S104: Calculate a weighted body weight according to a first weight assigned to the first weight and a second weight assigned to the second weight, and use the weighted body weight as a reference body weight of the occupant.

[0015] Preferably, in step S102, the body shape of the occupant is obtained by obtaining joint point information and / or contour information and / or depth information of the occupant through a camera and / or a radar.

[0016] Preferably, before, during or after executing step S101, the following steps are included:

[0017] S111: filling a second predetermined volume of gas into the seat cushion airbag, and measuring a reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no occupant is seated;

[0018] S112: detecting that an occupant is seated, measuring a second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag;

[0019] S113: Inferring a first sitting position according to the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and using the first sitting position as a reference sitting position for the occupant.

[0020] In another preferred embodiment of the present invention, step S112 further includes: detecting that an occupant is seated, and obtaining a second seated position of the occupant in the vehicle through an occupant observation module;

[0021] After step S113, the following steps are also included:

[0022] S114: Calculate a weighted position according to the third weight assigned to the first sitting position and the fourth weight assigned to the second sitting position, and use the weighted position as a reference sitting position for the occupant.

[0023] The first predetermined volume and the second predetermined volume may be the same or different.

[0024] Preferably, step S111 includes:

[0025] S1111: Divide the seat cushion airbag into multiple inflation areas;

[0026] S1112: Fill each inflation area with initial gas;

[0027] S1113: measuring a reference pressure of initial gas formed in each inflation area when no occupant is seated, and measuring an actual pressure of initial gas formed in each inflation area when an occupant is detected to be seated;

[0028] S1114: Obtain a position distribution according to a difference between a reference pressure of each inflation area and an actual pressure of each inflation area, and define a first sitting position of the occupant according to the position distribution.

[0029] Preferably, the volumes of the initial gas in at least some of the gas-filled areas are the same.

[0030] Preferably, step S112 includes: obtaining the second sitting position by obtaining the occupant depth information through a ToF camera (Time-of-Flight, ToF technology refers to an imaging technology in which a group of infrared lights (laser pulses) invisible to the human eye are emitted outward, reflected after encountering an object, and end reflecting to the camera, and the time difference or phase difference from emission to reflection back to the camera is calculated, and the data is collected to form a group of distance depth data, thereby obtaining a three-dimensional 3D model).

[0031] The present invention also provides an occupant characteristic detection system, which is characterized in that it includes a seat cushion airbag, and the occupant characteristic detection system also includes an inflation module for inflating the seat cushion airbag, a control module, a detection module and a calculation module, wherein:

[0032] The control module is used to control the inflation module to inflate a first predetermined volume of gas into the seat cushion airbag.

[0033] The detection module is used to measure a reference pressure formed by the first predetermined volume of gas when no passenger is seated, and to measure a first pressure formed by the first predetermined volume of gas when a passenger is seated.

[0034] The calculation module is used to obtain a first weight according to a difference between the reference pressure and the first pressure, and use the first weight as a reference weight of the occupant.

[0035] Preferably, the control module is used to control the inflation module to inflate a second predetermined volume of gas into the seat cushion airbag.

[0036] The detection module is used to measure the reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no passenger is sitting, and to measure the second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when a passenger is sitting.

[0037] The calculation module is used to infer a first sitting position according to the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and use the first sitting position as a reference sitting position of the occupant.

[0038] Preferably, the occupant characteristic detection system further comprises an occupant observation module, which is used to obtain the body shape of the occupant and obtain the second weight according to the body shape.

[0039] The calculation module is used to calculate a weighted body weight according to a first weight assigned to the first weight and a second weight assigned to the second weight, and use the weighted body weight as a reference body weight of the occupant.

[0040] Preferably, the occupant observation module includes a camera and / or a radar arranged in the vehicle, which is used to obtain the occupant's joint point information and / or contour information and / or depth information to obtain the occupant's body shape.

[0041] Preferably, the occupant observation module is further used to obtain a second sitting position of the occupant in the vehicle,

[0042] The calculation module is also used to infer a first sitting position based on the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and to calculate a weighted position based on a third weight assigned to the first sitting position and a fourth weight assigned to the second sitting position, and to use the weighted position as a reference sitting position for the occupant.

[0043] The first predetermined volume and the second predetermined volume may be the same or different.

[0044] Preferably, the occupant observation module includes a ToF camera for acquiring the second sitting position by acquiring depth information of the occupant.

[0045] Preferably, the seat cushion airbag comprises a plurality of air bags,

[0046] The inflation module is used to inflate each air bag with initial gas.

[0047] The detection module is used to measure the reference pressure of the initial gas in each air bag when there is no passenger sitting, and to measure the actual pressure of the initial gas in each air bag when it is detected that there is a passenger sitting.

[0048] The calculation module is used to obtain a position distribution according to the difference between the reference pressure of each airbag and the actual pressure of each airbag, and define the first sitting position of the occupant according to the position distribution. The first reference sitting position obtained in this way can still be combined with the second sitting position obtained by the occupant observation module to obtain a more accurate reference sitting position through weighted calculation.

[0049] Preferably, the volumes of the initial gases in at least some of the gas pockets are the same.

[0050] The present invention also provides a computer-readable medium, which is characterized in that computer instructions are stored thereon, and when the computer instructions are executed by a processor, the steps of the occupant feature detection method as described above are implemented.

[0051] The technical effects obtained by the present invention are:

[0052] There is no need to add pressure sensors in the seats. The present invention utilizes the seat cushion airbags provided in the seats to achieve dual detection of weight and body shape, so as to fully consider the actual situation of the occupants and formulate targeted safety strategies for them, thereby further ensuring the safety of the occupants. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a flow chart of detecting a reference weight of an occupant in a method for detecting characteristics of an occupant according to an embodiment of the present invention;

[0054] Figure 2 is a flow chart of detecting a reference weight of an occupant in a method for detecting characteristics of an occupant according to another embodiment of the present invention;

[0055] Figure 3 is a flow chart of detecting a reference sitting position of an occupant in an occupant feature detection method according to another embodiment of the present invention;

[0056] Figure 4 The present invention is a flowchart of detecting a reference sitting position of an occupant in an occupant characteristic detection method according to another embodiment of the present invention.

[0057] Figure 5 is a structural block diagram of an occupant feature detection system according to an embodiment of the present invention;

[0058] Figure 6 FIG. 4 is a structural block diagram of an occupant feature detection system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0059] The following is a further description based on specific implementations of the present invention in conjunction with the accompanying drawings.

[0060] refer to Figure 1-Figure 2 , introduces two preferred embodiments of the occupant feature detection method of the present invention, wherein obtaining the occupant reference weight includes the following steps:

[0061] refer to Figure 1 , step 101: filling a seat cushion airbag with a first predetermined volume of gas, and measuring a reference pressure formed by the first predetermined volume of gas when no occupant is seated;

[0062] Step 102: measuring a first pressure formed by the first predetermined volume of gas after an occupant is seated;

[0063] Step 103: Obtain a first weight according to the difference between the reference pressure and the first pressure, and use the first weight as the reference weight of the occupant.

[0064] refer to Figure 2 In another embodiment, in order to more accurately obtain the reference weight of the occupant, the following steps are also included (steps 201-203 are the same as Figure 1 Steps 101-103 in ()

[0065] Step 204: Obtain the body shape of the occupant and obtain the second weight according to the body shape, for example, by obtaining the joint point information and / or contour information of the occupant through a camera and / or radar disposed inside the vehicle to obtain the body shape of the occupant, for example, by obtaining the distance from the pelvic joint point to the top of the head of the occupant, a sitting height can be obtained to roughly judge the body shape of the person; or the depth information of the person can be obtained through a ToF camera, and the distance from the person to the ToF camera can be measured, and the body shape of the occupant can be obtained by combining the distance and the joint point information;

[0066] Step 205: Calculate a weighted body weight according to the first weight assigned to the first weight and the second weight assigned to the second weight, and use the weighted body weight as a reference body weight of the occupant.

[0067] Reference below Figure 3-Figure 4 , introduces the detection of the seat position in the occupant characteristic detection method of two preferred embodiments of the present invention, first referring to Figure 3 , the method for detecting the seat position of the occupant includes:

[0068] Step 301: Fill the seat cushion airbag with a second predetermined volume of gas, and measure the reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no occupant is sitting. For example, multiple airbags are placed at different positions in the seat cushion, so when a person sits, the pressure at each position will be different. Measure the reference pressure at the initial moment. Then, determine the position of the person through different pressure distributions. For example, the position with relatively high pressure is the position where the person tends to lean. Those skilled in the art will understand that the first predetermined volume and the second predetermined volume may be the same or different without affecting the implementation of the present invention;

[0069] Step 302: measuring a second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when an occupant is seated;

[0070] Step 303: Inferring a first sitting position based on the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and using the first sitting position as a reference sitting position.

[0071] In another embodiment, reference Figure 4 (Steps 401-403 are the same Figure 3 Step 404: Detecting that an occupant is seated, obtaining a second seated position of the occupant in the vehicle through an occupant observation module, for example, obtaining the occupant depth information through a ToF camera to obtain the second seated position;

[0072] Step 405: Calculate a weighted position according to the third weight assigned to the first sitting position and the fourth weight assigned to the second sitting position, and use the weighted position as a reference sitting position for the occupant.

[0073] In this technical solution, the seat cushion airbag is used to accurately obtain the reference weight and reference sitting position of the occupant, so as to set the inflation conditions for each occupant in a targeted manner, thereby providing targeted protection for the occupant.

[0074] Those skilled in the art will appreciate that, in the occupant characteristic detection method of the present invention, there is no particular order for obtaining the reference weight and obtaining the reference sitting position, and they may be performed successively or simultaneously.

[0075] Reference below Figure 5-Figure 6 , introduces the occupant feature detection system of two preferred embodiments of the invention. First, refer to Figure 5 The occupant characteristic detection system includes a seat cushion airbag 10, and the occupant characteristic detection system also includes an inflation module 1 for inflating the seat cushion airbag, a control module 2, a detection module 3 and a calculation module 4, wherein:

[0076] The control module 2 is used to control the inflation module to inflate a first predetermined volume of gas into the seat cushion airbag 10.

[0077] The detection module 3 is used to measure the reference pressure formed by the first predetermined volume of gas when no passenger is seated, and to measure the first pressure formed by the first predetermined volume of gas when a passenger is seated.

[0078] The calculation module 4 is used to obtain a first weight according to the difference between the reference pressure and the first pressure, and use the first weight as the reference weight of the occupant.

[0079] At the same time, the control module 2 is used to control the inflation module 1 to inflate a second predetermined volume of gas into the seat cushion airbag 10.

[0080] The detection module 3 is used to measure the reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no passenger is sitting, and to measure the second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when a passenger is sitting.

[0081] The calculation module 4 is used to infer a first sitting position according to the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and use the first sitting position as the reference sitting position of the occupant. The first predetermined volume and the second predetermined volume may be the same or different.

[0082] refer to Figure 6 In order to obtain the reference weight of the occupant more accurately, the occupant feature detection system also includes an occupant observation module 5. The occupant observation module 5 can be used to obtain the body shape of the occupant and obtain the second weight based on the body shape. The calculation module 4 is also used to calculate the weighted weight based on the first weight assigned to the first weight and the second weight assigned to the second weight. In addition, the occupant observation module 5 can also be used to obtain the second sitting position of the occupant in the vehicle. The calculation module 4 can also be used to calculate the weighted position based on the third weight assigned to the first sitting position and the fourth weight assigned to the second sitting position, and use the weighted position as the reference sitting position of the occupant.

[0083] The inflation module 1 can inflate the seat cushion airbag in a variety of ways. A preferred implementation is: the seat cushion airbag includes a plurality of airbags, the inflation module 1 is used to fill each airbag with initial gas, and the detection module 3 is used to measure the reference pressure formed by the initial gas in each airbag when there is no passenger sitting, and the actual pressure formed by the initial gas in each airbag when there is a passenger sitting. The volume of the initial gas in at least some of the airbags is the same.

[0084] The present invention also provides a computer-readable medium having computer instructions stored thereon, and when the computer instructions are executed by a processor, the steps of the occupant feature detection method as described above are implemented.

[0085] The present invention utilizes an inflatable seat cushion airbag. By measuring the different pressures and pressure distributions of the gas in the seat cushion airbag when there is a occupant sitting or not, the occupant's reference weight and reference sitting position are obtained. The occupant's characteristics can be obtained without adding additional pressure sensors, thereby formulating targeted protection strategies for each occupant and improving driving safety.

[0086] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for detecting occupant characteristics, characterized in that: include: S101: Filling a seat cushion airbag with a first predetermined volume of gas, and measuring a reference pressure formed by the first predetermined volume of gas when no occupant is seated; S102: measuring a first pressure formed by the first predetermined volume of gas after an occupant is seated; and obtaining a body shape of the occupant and obtaining a second weight according to the body shape; S103: Obtaining a first weight according to a difference between the reference pressure and the first pressure; S104: Calculate a weighted body weight according to a first weight assigned to the first weight and a second weight assigned to the second weight, and use the weighted body weight as a reference body weight of the occupant.

2. The occupant feature detection method according to claim 1, characterized in that: In step S102, the body shape of the occupant is obtained by obtaining the joint point information and / or contour information and / or depth information of the occupant through a camera and / or a radar.

3. The occupant feature detection method according to claim 1, characterized in that: Before, during or after executing step S101, the method includes: S111: filling a second predetermined volume of gas into the seat cushion airbag, and measuring a reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no occupant is seated; S112: measuring a second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when an occupant is seated; S113: Inferring a first sitting position according to the difference between the reference pressure and the second pressure at each position of the seat cushion airbag, and using the first sitting position as a reference sitting position for the occupant.

4. The occupant feature detection method according to claim 1, characterized in that: Before, during or after executing step S101, the method includes: S111: filling a second predetermined volume of gas into the seat cushion airbag, and measuring a reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when no occupant is seated; S112: measuring a second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when an occupant is seated; and obtaining a second seated position of the occupant in the vehicle through an occupant observation module; S113: inferring a first sitting position according to a difference between the reference pressure and the second pressure at each position of the seat cushion airbag; S114: Calculate a weighted position according to the third weight assigned to the first sitting position and the fourth weight assigned to the second sitting position, and use the weighted position as a reference sitting position for the occupant.

5. The occupant feature detection method according to claim 4, characterized in that: Step S112 includes: obtaining the second sitting position by obtaining the occupant's depth information through a ToF camera.

6. The occupant characteristic detection method according to claim 4, characterized in that: Step S111 includes: S1111: Divide the seat cushion airbag into multiple inflation areas; S1112: Fill each inflation area with initial gas; S1113: measuring a reference pressure of initial gas formed in each inflation area when no occupant is seated, and measuring an actual pressure of initial gas formed in each inflation area when an occupant is detected to be seated; S1114: Obtain a position distribution according to a difference between a reference pressure of each inflation area and an actual pressure of each inflation area, and define a first sitting position of the occupant according to the position distribution.

7. The occupant characteristic detection method according to claim 6, characterized in that: The volume of the initial gas in at least some of the gas-filled areas is the same.

8. An occupant feature detection system, characterized in that: Including a seat cushion airbag, the occupant characteristic detection system also includes an inflation module for inflating the seat cushion airbag, a control module, a detection module, a calculation module and an occupant observation module, wherein, The control module is used to control the inflation module to inflate a first predetermined volume of gas into the seat cushion airbag. The detection module is used to measure a reference pressure formed by the first predetermined volume of gas when no passenger is seated, and to measure a first pressure formed by the first predetermined volume of gas when a passenger is seated. The occupant observation module is used to obtain the body shape of the occupant and obtain the second weight according to the body shape, wherein the occupant observation module includes a camera and / or a radar arranged inside the vehicle, and is used to obtain joint point information and / or contour information and / or depth information of the occupant to obtain the body shape of the occupant; The calculation module is used to obtain a first weight according to a difference between the reference pressure and the first pressure, and to calculate a weighted body weight according to a first weight assigned to the first weight and a second weight assigned to the second weight, and to use the weighted body weight as a reference body weight of the occupant; The occupant observation module is further used to obtain a second sitting position of the occupant in the vehicle, and the calculation module is further used to calculate a weighted position according to a third weight assigned to the first sitting position and a fourth weight assigned to the second sitting position, and use the weighted position as a reference sitting position of the occupant; Among them, the control module is used to control the inflation module to fill a second predetermined volume of gas into the seat cushion airbag, the detection module is used to measure the reference pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when there is no occupant sitting, and to measure the second pressure formed by the second predetermined volume of gas at various positions of the seat cushion airbag when a occupant is detected sitting, and the calculation module is used to infer the first sitting position based on the difference between the reference pressure and the second pressure at each position of the seat cushion airbag.

9. The occupant characteristic detection system according to claim 8, characterized in that: The occupant observation module includes a ToF camera, which is used to obtain the second sitting position by acquiring the occupant's depth information.

10. The occupant characteristic detection system according to claim 8, characterized in that: The seat cushion airbag includes multiple air bags. The inflation module is used to inflate each air bag with initial gas. The detection module is used to measure the reference pressure of the initial gas in each air bag when there is no passenger sitting, and to measure the actual pressure of the initial gas in each air bag when it is detected that there is a passenger sitting. The calculation module is used to obtain a position distribution according to a difference between a reference pressure of each airbag and an actual pressure of each airbag, and define a first sitting position of the occupant according to the position distribution.

11. The occupant characteristic detection system according to claim 10, characterized in that: The volumes of the initial gas in at least some of the gas pockets are the same.

12. A computer readable medium, characterized in that Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the steps of the occupant feature detection method according to any one of claims 1 to 7 are implemented.

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