Intelligent control system of automobile safety belt and control method thereof

Abstract

The invention relates to the technical field of automobile safety systems, in particular to an intelligent control system of an automobile safety belt, comprising a cushion pressure sensor for detecting the sitting posture of a passenger; the brake signal detection sensor is used for detecting a brake signal; a collision detection sensor for detecting the occurrence of a collision; the vehicle body position sensor is used for detecting the vehicle motion state; the controller is in signal connection with the sensors; when the system detects a collision accident, a linkage mechanism of the safety belt and the seat can be automatically triggered, more comprehensive and comfortable buffering protection is provided for a passenger through the synchronous inflation function of the safety belt, the seat cushion and the backrest, the restraint effect of the safety belt is enhanced through the innovative design, and the safety of the passenger is improved. And the stress distribution of passengers in an accident is optimized, the injury risk is effectively reduced, and meanwhile, the overall riding experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive safety systems, and particularly to an intelligent control system for vehicle seat belts. Background Art

[0002] Seat belts in vehicles are designed to reduce the harm to passengers in the event of a collision, sudden braking, or emergency stop by preventing the person wearing the seat belt from hitting hard components inside the vehicle or other passengers in the vehicle and by preventing the person wearing the seat belt from being thrown out of the vehicle; many vehicles are equipped with three-point seat belts, which include a shoulder belt that diagonally crosses the chest of the passenger and a pelvic restraint that crosses the pelvis of the passenger to disperse the impact force on the chest, pelvis, and shoulders of vehicle passengers; enabling the seat belt to have a force-limiting function, a vibration function, an active pre-tensioning function, and an emergency pre-tensioning function simultaneously is the future development trend of seat belts, and currently, there are already individual products with this function.

[0003] However, traditional seat belts only rely on mechanical locking and cannot dynamically adjust the binding force according to the accident risk level. For example, when the vehicle rolls over, both too tight and too loose seat belts will increase additional harm, and the protective effect on people during a side collision is reduced, so it is not comprehensive enough.

[0004] In summary, the applicant has proposed an intelligent control system for vehicle seat belts. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent control system for vehicle seat belts, and at the same time, to add a function of the seat belt and the seat being linked to inflate to reduce the harm suffered by the human body during a side collision. To achieve the above technical purpose, the technical solution of the present invention is as follows:

[0006] An intelligent control system for vehicle seat belts includes a seat cushion pressure sensor for detecting the sitting posture of the occupant, a brake signal detection sensor for detecting brake signals, a collision detection sensor for detecting the occurrence of a collision, a vehicle body position sensor for detecting the motion state of the vehicle, and a controller for signal connection with each sensor and a seat belt assembly.

[0007] Further defined, an intelligent control system for vehicle seat belts further includes:

[0008] A collision direction detection unit: composed of a triaxial acceleration sensor (sampling frequency 1 kHz) installed on the B-pillar and a lateral pressure sensor array of the seat frame (resolution 0.1 N / cm 2 )

[0009] Dynamic pre-tension actuator: The seat belt retractor is equipped with a dual-winding motor (peak torque 2 N·m) and a shoulder belt inflatable airbag (Kevlar fiber-reinforced layer, burst pressure ≥ 100 kPa);

[0010] Cooperative control module: Generates a control strategy based on the collision direction:

[0011] Front collision: Initiate secondary pre-tension (tension 200 N) + inflate the shoulder belt to 30 kPa;

[0012] Side collision: Reduce the pre-tension force of one-sided seat belt by 40% + increase the pressure of the seat cushion air chamber on the impact side to 2 times that of the non-impact side;

[0013] Vehicle rollover: Dynamically adjust the pre-tension force (20 - 150 N) to match the body roll angular velocity (feedback through gyroscope signal);

[0014] The shoulder belt inflatable airbag adopts a double-chamber structure. The inner chamber is filled with nitrogen (purity ≥ 95%), and the outer chamber is a shear-thickening fluid layer; The seat air chamber realizes energy-level absorption through a gradient pressure relief valve group, and the pressure relief thresholds are set at three levels: 10 kPa / 20 kPa / 30 kPa.

[0015] Further defined, a control method for an intelligent control system of an automotive seat belt includes the following steps:

[0016] Step S10, first the occupant positioning system detects the occupant's sitting posture, then detects the brake signal. If the brake is detected, the seat belt is pre-tensioned, and then step S20 is carried out. If not detected, the brake signal detection is repeated;

[0017] Step S20, perform collision detection. If no collision is detected, step S30 is carried out. If a collision is detected, step S40 is carried out;

[0018] Step S30, determine whether the vehicle is stationary. If it is stationary, the seat belt gradually relaxes. If not stationary, the seat belt remains pre-tensioned;

[0019] Step S40, detect whether the vehicle rolls over. If it does not roll over, detect the collision position. If it rolls over, the seat belt and the seat are inflated and shock-absorbed, and the seat belt dynamically adjusts the tightness according to the human body tilt direction, and then step S60 is carried out;

[0020] Step S50, detect the collision position, determine whether it is frontal, rear or side, and then trigger the inflation command. The seat belt is inflated, and the seat (seat cushion, backrest) is inflated, and then step S60 is carried out;

[0021] Step S60: Detect whether the vehicle is stationary. If it is stationary, the seat belt and the seat are gradually deflated, and then the seat belt is gradually loosened until it is released to facilitate rescue after an accident. If it is not stationary, the above state is maintained and the judgment is repeated.

[0022] Further defined, before the operation of the intelligent control system of the vehicle seat belt, the following steps are also included:

[0023] Step S01: Power on the whole vehicle;

[0024] Step S02: Judge whether the driver has fastened the seat belt. If so, proceed to the next step; if not, repeat the judgment;

[0025] Step S03: Detect the seat cushion pressure through the seat cushion pressure sensor and input it into the system;

[0026] Step S04: Start the intelligent control system of the vehicle seat belt;

[0027] Step S05: Start the real-time monitoring vehicle safety system.

[0028] After improvement, the present invention further has the following beneficial effects:

[0029] When the system in the present invention detects a collision accident, it can automatically trigger the linkage mechanism of the seat belt and the seat. Through the synchronous inflation function of the seat belt, seat cushion and backrest, it provides a more comprehensive and comfortable buffer protection for the occupants. This innovative design not only enhances the restraint effect of the seat belt, but also optimizes the force distribution of the occupants in the accident, effectively reducing the risk of injury and improving the overall riding experience at the same time. Description of the Drawings

[0030] Figure 1 It is a flowchart for starting an intelligent control system of a vehicle seat belt.

[0031] Figure 2 It is a flowchart for an intelligent control method of a vehicle seat belt. Detailed Embodiments

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0033] Embodiment 1:

[0034] As Figure 1-2 shown, a control method for an intelligent control system of a vehicle seat belt includes the following steps:

[0035] Step S10, first the occupant positioning system detects the occupant's sitting posture, then performs brake signal detection, if braking is detected, the seat belt is pre-tightened, and then step S20 is performed, if not detected, the brake signal detection is repeated;

[0036] Step S20, performing collision detection, if no collision is detected, proceeding to step S30, if a collision is detected, proceeding to step S40;

[0037] Step S30, determining whether the vehicle is stationary, if so, gradually loosening the seat belt, if not, keeping the seat belt pre-tightened;

[0038] Step S40, detecting whether the vehicle rolls over, if not, detecting the collision position, if rolling over, the seat belt and the seat are inflated for shock absorption, and the seat belt is dynamically adjusted in tightness according to the tilt direction of the human body, and then proceeding to step S60;

[0039] Step S50, detecting the collision position, determining whether it is the front, rear or side, and then triggering the inflation command, inflating the seat belt and the seat (cushion, backrest), and then proceeding to step S60;

[0040] Step S60, detecting whether the vehicle is stationary, if so, the seat belt and the seat are gradually deflated, and then the seat belt is gradually loosened until it is released to facilitate rescue after an accident, and if not, the above state is maintained and the judgment is repeated.

[0041] The automobile safety belt intelligent control system also includes the following steps before operation:

[0042] Step S01, power on the vehicle;

[0043] Step S02, determining whether the driver has fastened his seat belt, if yes, proceed to the next step, if no, repeat the determination;

[0044] Step S03, detecting the seat cushion pressure through the seat cushion pressure sensor and inputting it into the system;

[0045] Step S04, starting the car seat belt intelligent control system;

[0046] Step S05, starting the real-time monitoring vehicle safety system.

[0047] It should be noted that

[0048] Specific description of the collision detection and triggering system:

[0049] Sensor Configuration:

[0050] The seat belt has a built-in piezoelectric film sensor (sensitivity 0.5N, response time ≤1ms);

[0051] A three-axis acceleration sensor (range ±50g, accuracy 0.1g) is installed at the bottom of the seat;

[0052] Control logic:

[0053] When the acceleration sensor detects a collision (threshold > 5g) and the seat belt tension > 200N, the ECU triggers the inflation command within ≤5ms.

[0054] Specific description for the seat belt inflation module:

[0055] Airbag structure:

[0056] Adopts a split design: shoulder airbag (volume 1.2L, pressure 25kPa) + waist airbag (volume 0.8L, pressure 35kPa);

[0057] Material: double-layer composite TPU (outer layer tear strength > 80N / mm 2 , inner layer airtight layer permeability < 0.1cc / m 2 / day)

[0058] Inflation method:

[0059] The micro high-pressure gas cylinder (storage pressure 30MPa) is controlled by an electromagnetic valve to release, and the inflation time ≤ 30ms.

[0060] Specific description for the seat inflation module:

[0061] Air chamber layout:

[0062] Seat cushion area: honeycomb air chamber array (single air chamber diameter 15mm, pressure 10kPa);

[0063] Backrest area: longitudinal strip air chamber (width 50mm, pressure 15kPa);

[0064] Energy management:

[0065] The impact energy is absorbed in stages through a gradient pressure relief valve (opening pressure threshold 5kPa / 10kPa / 15kPa).

[0066] Specifically, the present invention also has the following technical solutions:

[0067] Solution 1: Cooperative control of split airbags

[0068] A coupling air path interface is set at the connection between the shoulder of the seat belt and the seat backrest. During a collision, the air path is connected through a quick connector (connection time < 10ms) to achieve balanced pressure distribution;

[0069] Solution 2: Multi-stage inflation strategy

[0070] Primary inflation (0 - 30 ms): The seat belt airbag inflates rapidly to 50% of its volume to initially restrain the occupant's displacement.

[0071] Secondary inflation (30 - 80 ms): The seat air chamber inflates to form a three-dimensional buffer layer with the seat belt.

[0072] Tertiary adjustment (80 - 200 ms): Dynamically adjusts the air chamber pressure according to the remaining collision energy.

[0073] For the implementation scheme of the deflation system, it is required to meet three core requirements: rapid response (complete 80% pressure release within ≤ 1 second), controllable adjustment (support hierarchical pressure relief), and cycle stability (performance degradation < 3% after > 500 cycles). The specific technical path is as follows:

[0074] 1. Mechanical pressure relief structure

[0075] 1.1 Gradient pressure relief valve group

[0076] Structure design:

[0077] Seat belt airbag: Configure a three-stage pressure relief valve (threshold 25 kPa / 15 kPa / 5 kPa), and achieve hierarchical pressure release through a spring-diaphragm composite structure.

[0078] Seat air chamber: Adopt a honeycomb microporous array (pore diameter 0.1 - 0.3 mm), and dynamically adjust the opening ratio through shape memory alloy (Ni-Ti, phase change temperature 40 °C).

[0079] Performance parameters:

[0080] Single-stage pressure relief flow rate: ≥ 12 L / s (@ 25 kPa pressure difference).

[0081] Full pressure release time: ≤ 0.8 seconds (from 50 kPa to 5 kPa).

[0082] 1.2 Active exhaust device

[0083] High-speed solenoid valve:

[0084] Response time ≤ 2 ms, passage diameter 3 mm, cooperate with a Venturi tube structure to accelerate exhaust (flow velocity > 50 m / s).

[0085] Integrate a piezoelectric ceramic feedback module to monitor the valve body opening in real time (accuracy ± 0.5%).

[0086] Exhaust path planning:

[0087] Seat belt airbag → seat air chamber → vehicle bottom diversion channel, forming a directional exhaust path to avoid high-temperature gas from hurting the occupants.

[0088] 2. Intelligent control strategy

[0089] 2.1 Multimodal deflation logic

[0090] Emergency mode (0 - 200 ms after collision):

[0091] The solenoid valve is fully open, and the mechanical pressure relief valve acts synchronously to reduce the pressure to the safety threshold (<5 kPa) within 1 second;

[0092] Steady mode (200 ms - 2 s after collision):

[0093] Based on the remaining pressure value (monitored by the MEMS pressure sensor, accuracy ±0.1 kPa), the solenoid valve opening is dynamically adjusted to control the pressure drop slope ≤8 kPa / s;

[0094] Reset mode (when the system is on standby):

[0095] The residual gas in the airbag is actively evacuated by a micro vacuum pump (pumping rate 0.5 L / min) to ensure a folding compression rate >90%;

[0096] 2.2 Failure protection mechanism

[0097] Dual redundant design:

[0098] When the main control circuit fails, the mechanical overpressure bursting disc (threshold 60 kPa) is forced to open for pressure relief;

[0099] The pressure relief valve is internally provided with a shape memory polymer (glass transition temperature 70 °C), and the pressure relief aperture automatically expands (amplification 50%) in a high-temperature environment.

[0100] Example 2:

[0101] An intelligent control system for an automotive seat belt, including a seat cushion pressure sensor for detecting the occupant's sitting posture; a brake signal detection sensor for detecting the brake signal; a collision detection sensor for detecting the occurrence of a collision; a vehicle body position sensor for detecting the vehicle's motion state; and a controller for signal connection with each sensor and the seat belt assembly.

[0102] An intelligent control system for an automotive seat belt further includes:

[0103] Collision direction detection unit: composed of a triaxial acceleration sensor (sampling frequency 1 kHz) installed on the B-pillar and a lateral pressure sensor array on the seat frame (resolution 0.1 N / cm 2 )

[0104] Dynamic pre-tensioning actuator: The seat belt retractor is internally provided with a dual-winding motor (peak torque 2 N·m) and a shoulder belt airbag (Kevlar fiber reinforced layer, bursting pressure ≥100 kPa);

[0105] Collaborative control module: Generates control strategies based on collision direction:

[0106] Frontal collision: activate secondary pretension (tension 200N) + shoulder belt inflation to 30kPa;

[0107] Side collision: The preload force of the seat belt on one side is reduced by 40% + the pressure of the seat cushion air chamber on the impact side is increased to twice that of the non-impact side;

[0108] Vehicle rollover: Dynamically adjust the preload (20-150N) to match the vehicle body rollover angular velocity (via gyroscope signal feedback);

[0109] The shoulder strap inflatable bag adopts a double-chamber structure, the inner chamber is filled with nitrogen (purity ≥ 95%), and the outer chamber is a shear thickening fluid layer; the seat air chamber realizes energy graded absorption through a gradient pressure relief valve group, and the pressure relief threshold is set to three levels of 10kPa / 20kPa / 30kPa.

[0110] For material and process innovation:

[0111] Anti-Stick Coating

[0112] Spray a fluorine-containing polymer coating (5-8 μm thick) on the inner wall of the airbag, with a friction coefficient of <0.1, to prevent the material from sticking and causing delayed retraction during deflation;

[0113] Elastic reset structure

[0114] The seat belt airbag has built-in spiral elastic ribs (TPEE material, elastic modulus 1.2GPa), which automatically shrink to 15% of the original volume after deflation;

[0115] The seat air chamber adopts pre-stretched elastic film (bidirectional stretching rate>300%), and the rebound force>8N / cm 2 .

[0116] Beneficial Effects

[0117] Dynamic constraint performance improvement

[0118] Through the collision direction recognition algorithm (accuracy > 98%) and multi-level preload control (20-150N dynamic adjustment), the seat belt restraint efficiency is improved by 40% compared with the traditional system:

[0119] In the event of a frontal collision, the secondary preload + shoulder strap inflation strategy reduces chest compression by 42% (trolley test data: from 45mm to 26mm, in line with ECE R94 standards);

[0120] In the event of a side impact, the unilateral preload is reduced by 40% and the seat air chamber pressure is doubled, which reduces the peak pelvic impact force by 35% (from 6.8kN to 4.4kN).

[0121] When the vehicle rolls over, the preload force is dynamically matched with the rolling angular velocity (control delay ≤ 15ms), effectively preventing overload on the occupant's neck (neck torque ≤ 34Nm, better than FMVSS208 requirements).

[0122] Innovation of energy dissipation mechanism

[0123] The coordinated design of the gradient pressure relief valve group (10 / 20 / 30kPa three-level threshold) and the shear thickening fluid layer (viscosity response time ≤ 5ms) is adopted to achieve graded absorption of impact energy:

[0124] The seat air chamber can dissipate 72% of the collision energy through three-stage pressure relief (traditional single-stage pressure relief only dissipates 49%);

[0125] The dual-chamber structure of the shoulder strap inflatable bag increases the impact force attenuation rate by 55% (nitrogen in the inner chamber quickly buffers rigid impact, and shear-thickening fluid in the outer chamber suppresses high-frequency oscillations).

[0126] Ergonomics

[0127] Sitting pressure sensor (resolution 0.1N / cm 2 ) and preload force joint adjustment algorithm, so that the trunk pressure distribution uniformity of different body types of occupants (5%-95% human percentile) is improved by 80%;

[0128] The post-collision seat belt slow-release mechanism (relaxation rate ≤ 5N / s) and air chamber emptying design reduce the rescue time by 60% (from the normal 35 seconds to 14 seconds).

[0129] Breakthrough in system reliability

[0130] The double-winding motor redundant drive (failure rate < 0.01‰) ensures 100% execution of the preload action;

[0131] The three-axis acceleration sensor (sampling rate 1kHz) and the gyroscope data are integrated to make the collision false alarm rate close to zero (false trigger times < 1 time / 10 6 Hour).

[0132] The above is a detailed introduction to an intelligent control system for a car seat belt provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An intelligent control system for a car seat belt, characterized in that: It includes a seat pressure sensor for detecting the sitting posture of the occupant; a brake signal detection sensor for detecting the brake signal; Collision detection sensor, used to detect the occurrence of a collision; body position sensor, used to detect the vehicle's motion state; The controller is used to connect with various sensor signals and the seat belt assembly.

2. The intelligent control system of a car seat belt according to claim 1, characterized in that: Also includes: Collision direction detection unit: A triaxial acceleration sensor (sampling frequency 1kHz) installed on the B-pillar and a lateral pressure sensor array (resolution 0.1N / cm 2 )composition; Dynamic pre-tensioning actuator: The seat belt retractor has a built-in dual-winding motor (peak torque 2N·m) and a shoulder belt inflatable bag (Kevlar fiber reinforced layer, bursting pressure ≥100kPa); Collaborative control module: Generates control strategies based on collision direction: Frontal collision: activate secondary pretension (tension 200N) + shoulder belt inflation to 30kPa; Side collision: The preload force of the seat belt on one side is reduced by 40% + the pressure of the seat cushion air chamber on the impact side is increased to twice that of the non-impact side; Vehicle rollover: Dynamically adjust the preload (20-150N) to match the vehicle body rollover angular velocity (via gyroscope signal feedback); The shoulder strap inflatable bag adopts a double-chamber structure, the inner chamber is filled with nitrogen (purity ≥ 95%), and the outer chamber is a shear thickening fluid layer; the seat air chamber realizes energy graded absorption through a gradient pressure relief valve group, and the pressure relief threshold is set to three levels of 10kPa / 20kPa / 30kPa.

3. The control method of the intelligent control system of a vehicle safety belt according to claim 1, characterized in that: The following steps are involved: Step S10, first the occupant positioning system detects the occupant's sitting posture, then performs brake signal detection, if braking is detected, the seat belt is pre-tightened, and then step S20 is performed, if not detected, the brake signal detection is repeated; Step S20, performing collision detection, if no collision is detected, proceeding to step S30, if a collision is detected, proceeding to step S40; Step S30, determining whether the vehicle is stationary, if so, gradually loosening the seat belt, if not, keeping the seat belt pre-tightened; Step S40, detecting whether the vehicle rolls over, if not, detecting the collision position, if rolling over, the seat belt and the seat are inflated for shock absorption, and the seat belt is dynamically adjusted in tightness according to the tilt direction of the human body, and then proceeding to step S60; Step S50, detecting the collision position, determining whether it is the front, rear or side, and then triggering the inflation command, inflating the seat belt and the seat (cushion, backrest), and then proceeding to step S60; Step S60, detecting whether the vehicle is stationary, if so, the seat belt and the seat are gradually deflated, and then the seat belt is gradually loosened until it is released to facilitate rescue after an accident, and if not, the above state is maintained and the judgment is repeated.

4. The control method of the intelligent control system of a vehicle safety belt according to claim 3, characterized in that: The automobile safety belt intelligent control system also includes the following steps before operation: Step S01, power on the vehicle; Step S02, determining whether the driver has fastened his seat belt, if yes, proceed to the next step, if no, repeat the determination; Step S03, detecting the seat cushion pressure through the seat cushion pressure sensor and inputting it into the system; Step S04, starting the car seat belt intelligent control system; Step S05, starting the real-time monitoring vehicle safety system.

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