Active pre-tightening safety belt performance test system and method based on dual modes

Abstract

The invention relates to an active pre-tightening type safety belt performance test system and method based on dual modes, and belongs to the technical field of mechanical engineering. A test trolley receives an input whole-process acceleration waveform under the dual modes of emergency braking and rear-end collision and then starts an active pre-tightening type safety belt performance test; triggering a pre-tightening signal to start an active pre-tightening motor controller to pre-tighten and pull back the safety belt, and accelerating the test trolley to a collision position according to the acceleration waveform in the emergency braking stage of the acceleration waveform of the whole process, and then the deceleration waveform generator performs deceleration braking on the trolley according to the acceleration waveform in the rear-end collision stage in the whole-process acceleration waveform, and the data acquisition analyzer acquires data of a plurality of sensors in the sensor network in the test process in real time to generate a test result. According to the technical scheme, the requirement for bidirectional change of the acceleration of the trolley under the emergency braking rear-end collision working condition can be met, and the test requirements of different vehicle types are met.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical engineering, and in particular to a dual-mode based active pre-tensioning seat belt performance testing system and method. Background Art

[0002] With the development of autonomous driving and the improvement of road safety requirements, active safety technologies are widely used in automobiles. Among them, the automatic emergency braking system can effectively avoid collisions or reduce collision speeds, but it will also cause the occupants and vehicles to be out of position before the collision occurs. Especially in the case of rear-end collisions, a greater amount of dislocation will lead to more severe whiplash injuries, which puts higher requirements on the occupant restraint system.

[0003] As an important part of the restraint system, seat belts can reduce occupant injuries during a collision. With the popularization of active functions of seat belts, active pre-tensioned seat belts are becoming more and more popular among consumers. They can reduce neck injuries by controlling the amount of displacement of occupants during emergency braking. In recent years, with the increase in the AEB matching rate, the number of rear-end collision accidents under emergency braking has increased, and various collision tests have gradually added AEB braking collision conditions. However, most scholars pay more attention to the performance test of active pre-tensioned seat belts in the emergency braking stage. The role of controlling the amount of displacement, such as a trolley for testing active restraint systems (patent number: 2021216497293) lacks an active pre-tensioned seat belt test system and method for the entire process of emergency braking rear-end collision.

[0004] Existing trolley devices are mainly based on unidirectional acceleration, which is difficult to meet the needs of bidirectional acceleration changes during emergency braking rear-end collisions. Therefore, it is necessary to design a new collision trolley device and experimental method to simulate emergency braking rear-end collision conditions, such as a front and rear bidirectional loaded car collision trolley and experimental method (patent number: 2023109673595), which can meet the needs of bidirectional acceleration. In the performance test of active pretensioning seat belts in emergency braking rear-end collision conditions, it is difficult to form a unified evaluation standard by directly inputting the waveform of the emergency braking curve of the actual vehicle. Relevant scholars have conducted relevant research on the simplification of the braking waveform in the emergency braking stage, such as a simplified analysis and processing method of AEB braking curve characteristics (patent number: 2023118641786). However, at present, the waveform of the entire process of emergency braking rear-end collision has not yet formed a unified standard, which is difficult to meet the testing needs of different models. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a dual-mode active pre-tensioned seat belt performance testing system and method, which can realize the requirement of bidirectional change of trolley acceleration in emergency braking rear-end collision conditions. As an integrated active pre-tensioned seat belt testing system of "emergency braking + rear-end collision", through the proposed emergency braking rear-end collision waveform channel, the emergency braking rear-end collision waveform that meets the test requirements of the vehicle model to be tested is selected in the channel to meet the test requirements of different vehicle models.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A dual-mode active pre-tensioned seat belt performance test system, the test system is applied to the full process test in the dual modes of emergency braking and rear-end collision, the system includes a sensor network, a test trolley, an active pre-tensioned seat belt module, a deceleration waveform generator and a data acquisition analyzer;

[0008] The sensor network includes an acceleration sensor and a speed sensor deployed on the test trolley, a first webbing tension sensor, a second webbing tension sensor and a webbing displacement sensor located in an active pretensioner seat belt module;

[0009] The active pre-tensioning seat belt module includes a seat belt, an active pre-tensioning seat belt motor and an active pre-tensioning motor controller;

[0010] After the test trolley receives the input full-process acceleration waveforms in the dual modes of emergency braking and rear-end collision, it starts the active pretensioning seat belt performance test and triggers the pretensioning signal to start the active pretensioning motor controller to pretension and pull back the seat belt. The test trolley is accelerated to the collision position according to the acceleration waveform of the emergency braking stage of the full-process acceleration waveform. Then the deceleration waveform generator decelerates and brakes the trolley with the acceleration waveform of the rear-end collision stage in the full-process acceleration waveform. The data acquisition and analyzer collects multiple sensor data in the sensor network in real time during the test to generate test results.

[0011] According to the above technical means, since the test system is used in the seat belt performance test, in order to achieve better practical application effects, it is necessary to confirm the test subject, which includes the seat belt to be tested on the one hand and the dummy model on the other hand.

[0012] Furthermore, the test system also includes a dummy model located on the seat of the test trolley and within the safety belt.

[0013] According to the above technical means, since it is necessary to implement a performance test on the seat belt, it is necessary to deploy sensors on the seat belt.

[0014] Furthermore, the first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are all located on the safety belt, and are respectively located at the lower right-angled side, the upper side of the hypotenuse and the upper position of the other right-angled side of the safety belt's approximately right-angled triangle.

[0015] According to the above technical means, in order to realize the test of the rear-end collision mode, a deceleration waveform generator is deployed at the rear of the test trolley to realize the detection of the rear-end collision stage.

[0016] Furthermore, the deceleration waveform generator is located at the rear of the test trolley, and the position of the deceleration waveform generator is determined based on the emergency braking phase travel distance obtained by twice integrating the acceleration waveform curve of the emergency braking phase of the full-process acceleration waveform.

[0017] According to the above technical means, since a pre-tensioning signal will be generated during the seat belt test, accurately obtaining the pre-tensioning signal will effectively improve the test efficiency.

[0018] Furthermore, the test system includes a pre-tensioning signal generating device, the seat belt is connected to the active pre-tensioning seat belt motor via a retractor, and the active pre-tensioning motor controller is connected to the pre-tensioning signal generating device.

[0019] According to the above technical means, since the test process needs to be detected according to the acceleration waveform in the dual mode, the test system also needs to include a host computer to provide the test system with accurate input control signals to achieve safety testing.

[0020] Furthermore, the test system also includes a host computer, which receives a pretensioning instruction from the host computer during the test, converts the instruction into an electrical signal through the CAN communication protocol, and then sends the electrical signal to the pretensioning signal generating device. After the pretensioning signal generating device triggers the pretensioning signal, it starts the active pretensioning motor controller to control the rotation of the active pretensioning seat belt motor, thereby driving the retractor shaft core to rotate and pull back the seat belt for pretensioning. After receiving the retractor locking signal, the pretensioning signal generating device transmits the signal to the data acquisition analyzer to record the retractor locking moment.

[0021] According to the above technical solution, the test system acts in dual mode and will produce emergency braking and rear-end collision processes. It is necessary to set up a power device and an energy absorption device to achieve the simulation effect during the test.

[0022] Furthermore, the test system also includes a hydraulic acceleration device, a hydraulic push rod and an energy absorption device. The hydraulic acceleration device hits the energy absorption device at the front end of the test trolley through the hydraulic push rod, so that the test trolley moves backward with acceleration to simulate the AEB braking process. When the test trolley moves to the rear-end collision position, the deceleration waveform generator at the rear of the test trolley is used to decelerate the test trolley to simulate the rear-end collision process.

[0023] According to the above technical solution, in order to realize the whole process of emergency braking rear-end collision of any intensity, a whole process acceleration waveform is proposed to realize effective measurement.

[0024] Furthermore, the acceleration waveform of the whole process satisfies that the speed change amount in the emergency braking stage is not less than the speed change amount in the rear-end collision stage, and the integral amount of the acceleration in the emergency braking stage is greater than the integral amount in the rear-end collision stage, and is expressed by the following formula:

[0025]

[0026] Among them, T 1 Indicates the time of emergency braking stage, T 2 Indicates the acceleration start time of the rear-end collision phase, T 3 Indicates the end time of the rear-end collision phase, a AEB Represents the acceleration waveform during the emergency braking phase, a rear-endcollision Represents the acceleration waveform during the rear-end collision phase.

[0027] According to the above technical solution, the waveform condition of emergency braking needs to be limited. In order to make the integral amount of acceleration in the braking phase greater than the integral amount in the collision phase, the braking duration needs to be limited.

[0028] Furthermore, the braking duration of the acceleration waveform in the emergency braking stage is determined by the braking slope and the braking intensity and satisfies the following formula:

[0029]

[0030] Where T is the braking duration, G brake Indicates the selected braking intensity, k brake Indicates the selected braking slope.

[0031] According to the purpose of the present invention, the present invention also proposes a dual-mode active pretensioner seat belt performance test method, which is applied to the above-mentioned test system, and the method includes:

[0032] Deploy a dual-mode active pretensioner seat belt performance test scenario, install the hydraulic acceleration device on the test trolley track, install the test trolley on the trolley track, let the energy absorption device at the front of the test trolley contact the hydraulic push rod, and obtain the emergency braking stage driving distance by integrating the emergency braking stage acceleration curve of the input full-process acceleration waveform twice, and determine the rear-end collision position to install the deceleration waveform generator;

[0033] The automobile seat to be tested and the active pretensioner seat belt module are mounted and fixed on the test trolley, and the sensor network is deployed. The acceleration sensor and the speed sensor are mounted on the test trolley, and the acceleration and speed changes of the test trolley during the test are recorded. The first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are mounted on the seat belt, and are located at the lower right-angled side, the upper side of the hypotenuse and the upper position of the other right-angled side of the approximately right-angled triangle of the seat belt, respectively. All sensor output interfaces and the signal interface of the dummy model are connected to the data acquisition analyzer;

[0034] After the test scenario deployment is completed, the test is started, and the whole process acceleration waveform is input through the host computer. At the same time, the host computer issues a pre-tightening instruction to the pre-tightening signal generating device. The hydraulic acceleration device accelerates the test trolley to the collision position with the waveform of the braking stage in the whole process acceleration waveform, and then the deceleration waveform generator decelerates and brakes the test trolley with the acceleration waveform of the rear-end collision stage in the whole process acceleration waveform;

[0035] The data acquisition analyzer collects multiple sensor data generated in the sensor network during the test process to generate test results.

[0036] Beneficial effects of the present invention:

[0037] The "hydraulic acceleration-braking deceleration" combined trolley device proposed in the present invention can meet the requirements of bidirectional changes in the trolley acceleration in emergency braking rear-end collision conditions. As an integrated active pre-tensioned seat belt test system of "emergency braking + rear-end collision", through the proposed emergency braking rear-end collision waveform channel, the emergency braking rear-end collision waveform that meets the test requirements of the vehicle model to be tested is selected in the channel to meet the test requirements of different vehicle models, thereby effectively improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the performance test system for active pre-tensioning seat belts during emergency braking and rear-end collision proposed by the present invention;

[0039] Figure 2 This is a schematic diagram of the installation position and test system of the seat belt sensor proposed by the present invention;

[0040] Figure 3It is a signal processing flow chart of the preload signal generating device proposed by the present invention;

[0041] Figure 4 This is a waveform diagram of the entire process of "emergency braking + rear-end collision" proposed by the present invention;

[0042] Figure 5 Schematic diagram of the waveform channel of the whole process of "emergency braking + rear-end collision" proposed by the present invention DETAILED DESCRIPTION

[0043] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0044] This embodiment proposes a dual-mode active pre-tensioning seat belt performance test system, such as Figure 1 and 2 As shown, the test system includes 1-hydraulic acceleration device, 2-hydraulic push rod, 3-energy absorption device, 4-data acquisition analyzer, 5-acceleration sensor, 6-speed sensor, 7-seat belt, 8-dummy model, 9-seat, 10-active pre-tensioning seat belt motor controller, 11-pre-tensioning signal generating device, 12-trolley, 13-deceleration waveform generator, 14-trolley track, 15-lock, 16-first webbing tension sensor, 17-second webbing tension sensor, 18-D ring, 19-webbing displacement sensor, 20-active pre-tensioning seat belt motor, 21-power supply, 22-test computer.

[0045] In this embodiment, in order to obtain test data more accurately, a sensor network is deployed in the test system. The sensor network is composed of an acceleration sensor and a speed sensor located on the test trolley, a first webbing tension sensor, a second webbing tension sensor and a webbing displacement sensor located in the active pretensioner seat belt module. Each sensor node is connected to a data acquisition analyzer to transmit data through wireless communication. Figure 2 As shown, the first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are all located on the safety belt, and are respectively located at the lower right-angled side, the upper side of the hypotenuse and the upper position of another right-angled side of the safety belt's approximately right-angled triangle.

[0046] In this embodiment, the test object includes a seat to be tested 9, a dummy model to be tested 8 and an active pre-tensioning seat belt module, wherein the active pre-tensioning seat belt module includes a seat belt 7, an active pre-tensioning seat belt motor 20 and an active pre-tensioning motor controller 10. In order to realize the pre-tensioning test of the seat belt, the test system also includes a pre-tensioning signal generating device 11. The seat belt 7 is connected to the active pre-tensioning seat belt motor 20 through a retractor, and the active pre-tensioning motor controller 10 is connected to the pre-tensioning signal generating device 11. After the active pre-tensioning motor controller 10 receives the pre-tensioning signal from the pre-tensioning signal generating device 11, the active pre-tensioning seat belt motor 20 rotates, thereby driving the retractor shaft core to rotate to pull back and pre-tighten the seat belt.

[0047] In this embodiment, as the bearing body of the seat belt 7 and the dummy model to be tested, the scene of emergency braking rear-end collision is simulated mainly by hydraulic acceleration and braking deceleration of the test trolley. The bearing body mainly includes a hydraulic acceleration device 1, a hydraulic push rod 2, a test trolley energy absorption device 3, a test trolley 12 and a deceleration waveform generator 13. The hydraulic acceleration device 1 hits the front energy absorption device 1 of the test trolley through the hydraulic push rod 2, so that the test trolley accelerates backward to simulate the AEB braking process. When the test trolley moves to the rear-end collision position, the deceleration waveform generator at the rear of the test trolley decelerates the trolley to simulate the rear-end collision process. The deceleration waveform generator is located at the rear of the test trolley. At this time, it is necessary to determine the position of the deceleration waveform generator. In this embodiment, the driving distance in the emergency braking stage obtained by performing two integrations according to the acceleration waveform curve of the emergency braking stage of the input full-process acceleration waveform is the position of the deceleration waveform generator.

[0048] The test system is controlled by inputting waveforms through the host computer. When testing, Figure 3 As shown, the pretensioning instruction of the upper computer is received, and the electrical signal is converted into an electrical signal through the CAN communication protocol and then sent to the pretensioning signal generating device. After the pretensioning signal generating device triggers the pretensioning signal, the active pretensioning motor controller is started to control the rotation of the active pretensioning seat belt motor, thereby driving the retractor shaft core to rotate to pull back and pretension the seat belt. After receiving the retractor locking signal, the pretensioning signal generating device transmits it to the data acquisition analyzer to record the retractor locking moment.

[0049] In this embodiment, in order to realize the whole process of emergency braking and rear-end collision of any intensity, a feasible combined trolley device inputting the whole process acceleration waveform of the whole process of "emergency braking + rear-end collision" is proposed. The waveform is as follows: Figure 4 The acceleration waveform of the whole process needs to satisfy that the speed change in the emergency braking stage is not less than the speed change in the rear-end collision, and the integral of the acceleration in the braking stage is greater than the integral of the collision stage, as shown below:

[0050]

[0051] Where T 1 represents the time of emergency braking stage, where T 2 represents the acceleration start time of the rear-end collision phase, where T 3 Indicates the end time of the rear-end collision phase, a AEB Indicates the acceleration waveform during emergency braking, a rear-endcollision Represents the acceleration waveform during the collision phase.

[0052] In this embodiment, in order to make the integral amount of acceleration in the braking phase greater than the integral amount in the collision phase, the braking duration should satisfy the following formula:

[0053]

[0054] Where T represents the braking duration, G brake Indicates the selected braking intensity, k brake Indicates the selected braking slope.

[0055] This embodiment proposes the following test waveforms based on the simplified emergency braking waveforms of 9 models with good consistency in CPNSOC-50 working conditions and the test waveforms in the "China Insurance Automobile Safety Index Regulations - Vehicle Occupant Safety Index - Seat / Headrest Dynamic Test Regulations (2023 Edition)". Figure 5 The waveform channel of the emergency braking rear-end collision condition is shown. Braking waveform boundary conditions: (1) braking slope: (-2g / s, -5g / s); (2) braking intensity: (-0.8g, -1g); (3) braking duration (0.36s, 0.56s).

[0056] Through the above content, the test system realizes the full-process active pre-tensioned seat belt performance test in both emergency braking and rear-end collision modes. The data acquisition and analyzer analyzes and processes the data collected by various sensors to obtain the evaluation results.

[0057] In this embodiment, the data collected by the data acquisition and analysis instrument include seat belt webbing tension, seat belt webbing displacement, head and shoulder mark point displacement, head-headrest contact time, head X-axis acceleration, T1 spine X-axis acceleration (left and right), neck shear force Fx, neck tension pressure Fz, trolley acceleration (X), trolley speed change (X), the collected data is filtered and analyzed, and the various types of collected data and videos are analyzed and the NIC index of the dummy neck is calculated through the measured dummy head X-axis acceleration and T1 thoracic spine X-axis acceleration, and the performance of the measured active pre-tensioned seat belt in emergency braking rear-end collision conditions is evaluated. It should be noted that this embodiment also includes an external high-speed camera to record the entire process from the start to the end of the test, so as to provide video content for the analysis of the test results.

[0058] According to the purpose of the present invention, this embodiment also proposes a dual-mode active pretensioner seat belt performance test method, which is applied to the above-mentioned test system and specifically includes the following contents:

[0059] Deploy a dual-mode active pretensioner seat belt performance test scenario, install the hydraulic acceleration device on the test trolley track, install the test trolley on the trolley track, let the energy absorption device at the front of the test trolley contact the hydraulic push rod, and obtain the emergency braking stage driving distance by integrating the emergency braking stage acceleration curve of the input full-process acceleration waveform twice, and determine the rear-end collision position to install the deceleration waveform generator;

[0060] The automobile seat to be tested and the active pretensioner seat belt module are mounted and fixed on the test trolley, and the sensor network is deployed. The acceleration sensor and the speed sensor are mounted on the test trolley, and the acceleration and speed changes of the test trolley during the test are recorded. The first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are mounted on the seat belt, and are located at the lower right-angled side, the upper side of the hypotenuse and the upper position of the other right-angled side of the approximately right-angled triangle of the seat belt, respectively. All sensor output interfaces and the signal interface of the dummy model are connected to the data acquisition analyzer;

[0061] After the test scenario deployment is completed, the test is started, and the whole process acceleration waveform is input through the host computer. At the same time, the host computer issues a pre-tightening instruction to the pre-tightening signal generating device. The hydraulic acceleration device accelerates the test trolley to the collision position with the waveform of the braking stage in the whole process acceleration waveform, and then the deceleration waveform generator decelerates and brakes the test trolley with the acceleration waveform of the rear-end collision stage in the whole process acceleration waveform;

[0062] The data acquisition analyzer collects multiple sensor data generated in the sensor network during the test process to generate test results.

[0063] In this embodiment, the car seat 9 and the safety belt 7 to be tested are fixed to the test trolley 12 and the relative position relationship between the safety belt and the car seat on the actual car can be correctly reproduced on the trolley, and the relative position error between the safety belt D-ring, buckle, anchor point and the car seat should be within ±5mm. The dummy model 8 to be tested is installed on the seat, and the sitting posture of the dummy model is adjusted to a suitable position according to the test requirements and the tested safety belt 7 is fastened.

[0064] like Figure 2As shown, the seat belt is approximately a right triangle, and a webbing displacement sensor 19 is installed at the vertical angle to test the pre-tensioning and pulling back of the seat belt webbing under the action of the active pre-tensioning seat belt during the emergency braking stage; a first webbing tension sensor is installed at the horizontal right angle, and a second webbing tension sensor is installed at the hypotenuse to test the load level of the shoulder belt and waist belt during the emergency braking process. The sensor installation position is as shown in FIG. Figure 2 As shown. The acceleration sensor 5 and the speed sensor 6 are installed on the test trolley 12 to record the acceleration and speed changes of the test trolley 12 during the test process. All sensor output interfaces and dummy signal interfaces are connected to the data acquisition analyzer 4.

[0065] In this embodiment, a method for measuring the displacement of the dummy model is also provided:

[0066] 1. Paste marking points on the head and shoulders of the dummy model, install a high-speed camera on the side of the dummy model, install a non-deformable metal plate on the opposite side of the camera, and paste a reference line vertically along the Z axis on the metal plate 100 mm forward from the X center of mass of the dummy head. The camera is installed perpendicular to this reference line. The pixel coordinate changes of the head and shoulder marking points are recorded as the head and shoulder displacement of the dummy model.

[0067] 2. Stick a marking point on the front of the dummy model's head and install a high-speed depth camera in front of the seat to ensure that the head and chest can appear in the camera lens during the entire emergency braking rear-end collision test. The pixel coordinate changes of the marking point are recorded as the head displacement.

[0068] 3. Install a cable extension displacement sensor at the rear of the seat headrest (to ensure that the seat headrest cannot touch the sensor during the collision), and insert the cable into the dummy model's neck near the T1 thoracic vertebra. The cable extension length recorded by the sensor is used as the dummy's neck displacement.

[0069] It should be noted that there is no specific restriction on the method for measuring the displacement of the dummy model, and it only needs to meet the displacement measurement requirements in practice.

[0070] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A dual-mode active pre-tensioning seat belt performance test system, characterized in that: The test system is applied to the full process test in the dual modes of emergency braking and rear-end collision, and the system includes a sensor network, a test trolley, an active pre-tensioning seat belt module, a deceleration waveform generator and a data acquisition analyzer; The sensor network includes an acceleration sensor and a speed sensor deployed on the test trolley, a first webbing tension sensor, a second webbing tension sensor and a webbing displacement sensor located in an active pretensioner seat belt module; The active pre-tensioning seat belt module includes a seat belt, an active pre-tensioning seat belt motor and an active pre-tensioning motor controller; After the test trolley receives the input full-process acceleration waveforms in the dual modes of emergency braking and rear-end collision, it starts the active pretensioning seat belt performance test and triggers the pretensioning signal to start the active pretensioning motor controller to pretension and pull back the seat belt. The test trolley is accelerated to the collision position according to the acceleration waveform of the emergency braking stage of the full-process acceleration waveform. Then the deceleration waveform generator decelerates and brakes the trolley with the acceleration waveform of the rear-end collision stage in the full-process acceleration waveform. The data acquisition and analyzer collects multiple sensor data in the sensor network in real time during the test to generate test results.

2. The dual-mode active pretensioner seat belt performance test system according to claim 1 is characterized in that: The test system also includes a dummy model located on the seat of the test trolley and within the safety belt.

3. The dual-mode active pretensioner seat belt performance test system according to claim 2 is characterized in that: The first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are all located on the safety belt, and are respectively located at the lower right-angled side, the upper side of the hypotenuse and the upper position of another right-angled side of the safety belt's approximately right-angled triangle.

4. The dual-mode active pretensioner seat belt performance test system according to claim 3 is characterized in that: The deceleration waveform generator is located at the rear of the test trolley, and the position of the deceleration waveform generator is determined by performing two integrations of the acceleration waveform curve of the emergency braking stage of the full-process acceleration waveform to obtain the emergency braking stage travel distance.

5. The dual-mode active pretensioner seat belt performance test system according to claim 4 is characterized in that: The test system comprises a pre-tensioning signal generating device, the seat belt is connected to the active pre-tensioning seat belt motor via a retractor, and the active pre-tensioning motor controller is connected to the pre-tensioning signal generating device.

6. The dual-mode active pretensioner seat belt performance test system according to claim 5, characterized in that: The test system also includes a host computer, which receives a pre-tensioning instruction from the host computer during the test, converts the instruction into an electrical signal through the CAN communication protocol, and then sends the electrical signal to the pre-tensioning signal generating device. After the pre-tensioning signal generating device triggers the pre-tensioning signal, it starts the active pre-tensioning motor controller to control the rotation of the active pre-tensioning seat belt motor, thereby driving the retractor shaft core to rotate and pull the seat belt back and pre-tension it. After receiving the retractor locking signal, the pre-tensioning signal generating device transmits the signal to the data acquisition analyzer to record the retractor locking moment.

7. The dual-mode active pretensioner seat belt performance test system according to claim 6, characterized in that: The test system also includes a hydraulic acceleration device, a hydraulic push rod and an energy absorption device. The hydraulic acceleration device hits the energy absorption device at the front end of the test trolley through the hydraulic push rod, so that the test trolley moves backward with acceleration to simulate the AEB braking process. When the test trolley moves to the rear-end collision position, the deceleration waveform generator at the rear of the test trolley is used to decelerate the test trolley to simulate the rear-end collision process.

8. The dual-mode active pretensioner seat belt performance test system according to claim 7, characterized in that: The acceleration waveform of the whole process satisfies that the speed change in the emergency braking stage is not less than the speed change in the rear-end collision stage, and the integral of the acceleration in the emergency braking stage is greater than the integral of the rear-end collision stage, and is expressed by the following formula: Among them, T1 represents the time of emergency braking stage, T2 represents the acceleration start time of rear-end collision stage, T3 represents the end time of rear-end collision stage, and a AEB Represents the acceleration waveform during the emergency braking phase, a rear-endcollision Represents the acceleration waveform during the rear-end collision phase.

9. The dual-mode active pretensioner seat belt performance test system according to claim 8, characterized in that: The braking duration of the acceleration waveform in the emergency braking stage is determined by the braking slope and braking intensity and satisfies the following formula: Where T is the braking duration, G brake Indicates the selected braking intensity, k brake Indicates the selected braking slope.

10. A dual-mode active pretensioner seat belt performance test method, the method being applied to the test system as claimed in any one of claims 1 to 9, characterized in that: The method comprises: Deploy a dual-mode active pretensioner seat belt performance test scenario, install the hydraulic acceleration device on the test trolley track, install the test trolley on the trolley track, let the energy absorption device at the front of the test trolley contact the hydraulic push rod, and obtain the emergency braking stage driving distance by integrating the emergency braking stage acceleration curve of the input full-process acceleration waveform twice, and determine the rear-end collision position to install the deceleration waveform generator; The automobile seat to be tested and the active pretensioner seat belt module are mounted and fixed on the test trolley, and the sensor network is deployed. The acceleration sensor and the speed sensor are mounted on the test trolley, and the acceleration and speed changes of the test trolley during the test are recorded. The first webbing tension sensor, the second webbing tension sensor and the webbing displacement sensor are mounted on the seat belt, and are located at the lower right-angled side, the upper side of the hypotenuse and the upper position of the other right-angled side of the approximately right-angled triangle of the seat belt, respectively. All sensor output interfaces and the signal interface of the dummy model are connected to the data acquisition analyzer; After the test scenario deployment is completed, the test is started, and the whole process acceleration waveform is input through the host computer. At the same time, the host computer issues a pre-tightening instruction to the pre-tightening signal generating device. The hydraulic acceleration device accelerates the test trolley to the collision position with the waveform of the braking stage in the whole process acceleration waveform, and then the deceleration waveform generator decelerates and brakes the test trolley with the acceleration waveform of the rear-end collision stage in the whole process acceleration waveform; The data acquisition analyzer collects multiple sensor data generated in the sensor network during the test process to generate test results.

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