Automobile safety air bag system for frontal offset collision, automobile and control method

Abstract

The invention relates to the technical field of power systems, in particular to an automobile safety air bag system for frontal offset collision, an automobile and a control method. According to the automobile safety air bag system, a weakening wire groove formed in an automobile body A column in the mounting unit and safety air bags which are arranged in the automobile body A column in the air bag unit and connected to the upper portion and the lower portion of the automobile body A column through a pull belt assembly are combined with the synergistic effect of a gas generator, a gas guide pipe and a bias detection sensor of the gas generation assembly; and when front-side offset collision occurs, the safety air bag rapidly breaks through the weakening line groove and is directionally unfolded along a preset angle. According to the method, the head of a driver can be prevented from being injured, the protection blind area of a traditional automobile safety air bag in the boundary included angle area of the driver safety air bag and the side face safety air curtain is made up, and the safety evaluation level of the head and neck of a vehicle in the C-IASI front face 25% offset collision working condition is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety, in particular to a frontal offset collision automobile airbag system, automobile and control method. Background Art

[0002] With the widespread use of automobiles, the demand for vehicle safety has also increased. In particular, the 25% frontal offset condition within the vehicle occupant safety index has received widespread attention from major automakers. Existing traditional automotive airbags consist of a driver-side airbag, a passenger-side airbag, a knee airbag, and side seat airbags and side curtain airbags for side impacts. These traditional automotive airbags can effectively protect vehicle occupants from injuries in frontal and side impacts in most cases. However, with the annual increase in vehicle ownership and the increasingly complex road transportation environment, the incidence of frontal offset collisions in actual traffic accidents, especially 25% frontal offset collisions, has also shown an increasing trend year by year. At this time, the protection provided by existing traditional automotive airbags in 25% frontal offset collisions is unsatisfactory.

[0003] Currently, there is no airbag device in the existing technology that is specifically designed to protect the driver's head from injury in a 25% offset frontal collision between the driver's airbag and the side airbag curtain. Therefore, the industry urgently needs to propose a car airbag system for a 25% offset frontal collision to make up for the technical defects of current traditional car airbags, avoid the risk of hard contact between the driver's head and the A-pillar interior guard plate, left front door guard plate, etc. in a 25% offset frontal collision, so as to protect the driver's life safety in actual traffic accidents. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a frontal offset impact automobile airbag system, automobile and control method to solve the above-mentioned deficiencies in the prior art.

[0005] The present invention discloses a frontal offset impact automobile airbag system, comprising: The mounting unit includes a vehicle body A-pillar, wherein the vehicle body A-pillar is provided with a weakened wire groove; An airbag unit, comprising an airbag, a gas generating assembly, and a drawstring assembly, wherein the airbag is disposed within the vehicle body A-pillar, and the ends of the airbag are connected to the upper and lower portions of the vehicle body A-pillar, respectively, via the drawstring assembly, so that the airbag is deployed along a preset angle after being inflated; The gas generating assembly includes a gas generator arranged in the A-pillar of the vehicle body and a bias detection sensor integrated on the vehicle. The gas generator is fastened to the airbag. The gas generator is provided with an air duct which is sleeved on the airbag, and the gas generator supplies air to the interior of the airbag through the air duct. The gas generator is also provided with an airbag wiring harness, and the gas generator is electrically connected to the bias detection sensor through the airbag wiring harness.

[0006] Optionally, the vehicle body A-pillar includes an A-pillar inner panel and an A-pillar interior guard panel arranged on the outside of the A-pillar inner panel, an assembly gap is formed between the A-pillar inner panel and the A-pillar interior guard panel, the airbag is fixed in the assembly gap between the A-pillar inner panel and the A-pillar interior guard panel, and the two ends of the airbag are respectively connected to the upper and lower parts of the A-pillar inner panel through the pull strap assembly, and the weakened wire groove is opened on the A-pillar interior guard panel.

[0007] Optionally, the drawstring assembly includes a first drawstring unit and a second drawstring unit, the first drawstring unit includes a first drawstring and a first buckle, the first buckle is fixed to the upper portion of the A-pillar inner panel, the second drawstring unit includes a second drawstring and a second buckle, the second buckle is fixed to the lower portion of the A-pillar inner panel; The airbag is arranged along the length direction of the A-pillar inner panel, and the top end of the airbag is connected to the first buckle through the first drawstring, and the bottom end of the airbag is connected to the second buckle through the second drawstring.

[0008] Optionally, the vehicle body A-pillar also includes an A-pillar outer panel, the A-pillar inner panel is located in front of the left front door of the vehicle body, the A-pillar outer panel is located at the top of the left front door of the vehicle body, and the A-pillar outer panel and the top end of the A-pillar inner panel are integrally formed and together constitute the supporting frame of the left front door of the vehicle body.

[0009] Optionally, a generator airbag is arranged between the safety airbag and the gas generator, the generator airbag is fastened to the safety airbag, the gas generator is arranged at the top end of the generator airbag, the air duct is connected to the bottom end of the generator airbag, and the gas generator is connected to the air duct through the generator airbag.

[0010] Optionally, the gas generating assembly further includes a first fastening ring and a second fastening ring, wherein the first fastening ring is arranged at the top of the generator airbag and fastens the top of the generator airbag to the safety airbag, and the second fastening ring is arranged at the bottom of the generator airbag and fastens the bottom of the generator airbag to the safety airbag.

[0011] Optionally, an air cavity is formed between the inner wall and the outer wall of the air duct, the generator air bag is connected to the air cavity, a plurality of air holes are provided on the inner wall of the air duct, and the air bag is provided with an air inlet corresponding to the air holes one by one. The gas generating assembly also includes a third fastening ring for fastening the air duct and the air bag.

[0012] Optionally, a generator bracket is provided on the inner panel of the A-pillar, and the generator airbag is fixed on the generator bracket. A first clip and a second clip are also provided on the inner panel of the A-pillar, the first clip is connected to the top of the airbag, and the second clip is connected to the bottom of the airbag.

[0013] The present invention also discloses a car, which includes a seat assembly, a steering wheel located in front of the seat assembly, an airbag arranged in the steering wheel, and a side airbag curtain located on the left side of the seat assembly. The car also includes the above-mentioned frontal offset impact car airbag system, and the coverage area of ​​the airbag after deployment is the blind spot of the intersection angle between the airbag and the side airbag curtain.

[0014] The present invention also discloses a control method, which uses the above-mentioned automobile airbag system for frontal offset collision, and the control method includes: The bias detection sensor is used to collect the vehicle collision acceleration signal and the collision angle signal in real time, and the acceleration signal and the collision angle signal are dynamically coupled and analyzed; When the coupling analysis results simultaneously meet the conditions that the acquired acceleration is greater than the preset acceleration threshold and the collision angle is within the preset angle range, a differentiated detonation command is generated; Based on the airbag wiring harness, the collision energy characteristic value carried by the differentiated detonation command is used to generate a segmented voltage pulse signal and transmit the signal to the gas generator; The gas generator dynamically adjusts the gas generation rate according to the segmented voltage pulse signal, and fills the airbag with high-pressure gas in a step-by-step manner through the air duct; When the airbag enters the primary expansion stage, the drawstring assembly remains in a relaxed state so that the airbag quickly breaks through the weakened groove; When the airbag enters the secondary expansion stage, the drawstring assembly is stretched straight by tension to pull the two ends of the airbag to expand along the preset angles constrained by the upper and lower A-pillars of the vehicle body until the airbag blind spot of the main driver is covered.

[0015] Compared with the prior art, the automobile airbag system, automobile, and control method for frontal offset collision provided by the embodiments of the present invention have the following beneficial effects: By installing the weakened wire groove on the A-pillar of the vehicle body in the unit, and the airbag in the airbag unit which is arranged in the A-pillar of the vehicle body and connected to the upper and lower parts of the A-pillar of the vehicle body through a pull strap assembly, combined with the synergistic effect of the gas generator, air duct and offset detection sensor of the gas generating assembly, the airbag can quickly break through the weakened wire groove and deploy directionally along a preset angle in the event of a frontal offset collision, effectively forming a protection area to isolate the driver's head from the hard contact between the A-pillar interior guard plate and the left front door guard plate, thereby avoiding head injury to the driver, making up for the protection blind spot of traditional automobile airbags in the angle area where the driver's airbag and the side airbag curtain intersect, and significantly improving the vehicle's head and neck safety evaluation level in the C-IASI 25% frontal offset collision condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which: Figure 1 A schematic diagram of the overall structure of an automobile airbag system provided by an embodiment of the present invention; Figure 2 A schematic diagram of the assembly structure of an airbag and a gas generator provided in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the automobile airbag system provided by an embodiment of the present invention.

[0017] The symbols in the accompanying drawings represent the following: 1. Vehicle body A-pillar; 11. Weakened wire groove; 12. A-pillar inner panel; 13. A-pillar interior trim panel; 14. A-pillar outer panel; 2. Airbag; 3. Drawstring assembly; 31. First drawstring; 32. First buckle; 33. Second drawstring; 34. Second buckle; 4. Gas generator; 41. Air duct; 42. Airbag wiring harness; 5. Generator airbag; 51. First fastening ring; 52. Second fastening ring; 6. Generator bracket; 7. First buckle; 8. Second buckle; 9. Vehicle; 91. Seat assembly; 92. Steering wheel; 93. Airbag; 94. Side airbag curtain. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0019] The present invention discloses a frontal offset collision automobile airbag system, such as Figure 1-Figure 3 Shown include: The mounting unit includes a vehicle body A-pillar 1, on which a weakened wire groove 11 is provided; The airbag unit includes an airbag 2, a gas generating assembly, and a drawstring assembly 3. The airbag 2 is disposed within the vehicle A-pillar 1, and the ends of the airbag 2 are connected to the upper and lower portions of the vehicle A-pillar 1 via the drawstring assembly 3, respectively, so that the airbag 2 deploys at a preset angle after inflation. The gas generating assembly includes a gas generator 4 arranged in the A-pillar 1 of the vehicle body, and a bias detection sensor integrated in the vehicle. The gas generator 4 is fastened to the airbag 2. The gas generator 4 is provided with an air duct 41 which is sleeved on the airbag 2, and the gas generator 4 supplies air to the interior of the airbag 2 through the air duct 41. The gas generator 4 is also provided with an airbag wiring harness 42, and the gas generator 4 is electrically connected to the bias detection sensor through the airbag wiring harness 42.

[0020] Through the implementation of the above-mentioned automotive airbag system embodiment, the coordinated operation of the installation unit, airbag unit, and gas generating assembly achieves precise protection for the driver's head in specific vehicle collision conditions. Its technical effects are concentrated as follows: First, the vehicle body A-pillar 1 in the installation unit provides a physical channel for the directional ejection of the airbag 2 through a pre-set weakening groove 11. This weakening groove 11 is precisely weakened based on the material properties of the vehicle body A-pillar 1, ensuring that the airbag 2 can break through the interior trim panel with minimal resistance at the moment of collision triggering. Second, the airbag unit uses the unique layout of the airbag 2 combined with the upper and lower bidirectional restraint mechanism of the drawstring assembly 3. After the gas generator 4 is activated, the airbag 2 is forcibly guided to deploy along a preset angle. This traction method based on the fixed point of the vehicle body A-pillar 1 directly overcomes the risk of head deviation caused by the vehicle's counterclockwise rotation in a 25% offset frontal collision. Furthermore, the gas generator assembly integrates the electrical linkage between the bias detection sensor and the gas generator 4, achieving millisecond-level signal transmission through the airbag wiring harness 42. When the bias detection sensor detects a collision signature that meets preset conditions, an electrical signal is immediately triggered, driving the gas generator 4 to efficiently supply gas to the interior of the airbag 2 through the air duct 41 mounted on the airbag 2. This ensures a uniform and stable gas flow rate while preventing localized burns to the fabric airbag caused by high-temperature gas. In particular, the airbag 2 is pre-positioned within the vehicle's A-pillar 1. This concealed layout perfectly complies with the passenger compartment space, completely unaffecting driving comfort and visibility in non-crash conditions. However, in the event of a collision, the synchronous response of the strap assembly 3 and the gas generator assembly allows the airbag 2 to precisely cover the blind spot at the intersection of the driver's airbag 93 and the side curtain airbag 94 at a preset angle, forming a physical buffer barrier. This protective layer directly blocks the left front movement trajectory of the driver's head under the action of collision inertia, so as to eliminate the risk of hard collision between the head and the A-pillar 1 of the vehicle body or the left front door guard, thereby solving the industry pain point that the 9 airbags 93 of traditional cars fail to provide protection in a 25% offset frontal collision. It directly improves the vehicle's head and neck safety evaluation level in the C-IASI standardized test, and provides a breakthrough technical guarantee for the safety of occupants' lives in complex traffic environments. At the same time, its compact installation feature is fully adapted to the existing vehicle architecture, and can be applied on a large scale without changing the main structure of the vehicle body.

[0021] Furthermore, the vehicle body A-pillar 1 includes an A-pillar inner panel 12 and an A-pillar interior guard panel 13 arranged on the outside of the A-pillar inner panel 12. An assembly gap is formed between the A-pillar inner panel 12 and the A-pillar interior guard panel 13. The airbag 2 is fixed in the assembly gap between the A-pillar inner panel 12 and the A-pillar interior guard panel 13, and the two ends of the airbag 2 are respectively connected to the upper and lower parts of the A-pillar inner panel 12 through the pull strap assembly 3. The weakened wire groove 11 is opened on the A-pillar interior guard panel 13.

[0022] Furthermore, the drawstring assembly 3 includes a first drawstring 31 unit and a second drawstring 33 unit. The first drawstring 31 unit includes a first drawstring 31 and a first buckle 32. The first buckle 32 is fixed to the upper portion of the A-pillar inner panel 12. The second drawstring 33 unit includes a second drawstring 33 and a second buckle 34. The second buckle 34 is fixed to the lower portion of the A-pillar inner panel 12. The airbag 2 is arranged along the length direction of the A-pillar inner panel 12 , and the top end of the airbag 2 is connected to the first buckle 32 via a first drawstring 31 , and the bottom end of the airbag 2 is connected to the second buckle 34 via a second drawstring.

[0023] Through the implementation of the above-mentioned automobile airbag system embodiment, the airbag 2 is used to realize directional deployment control through the upper and lower split restraint mechanism of the first pull belt 31 unit and the second pull belt 33 unit, wherein the first buckle 32 is fixed to the upper part of the A-pillar inner panel 12 to form a top anchor point, and the second buckle 34 is fixed to the lower part of the A-pillar inner panel 12 to form a bottom anchor point. When the airbag 2 is inflated, the top end of the airbag 2 arranged along the length direction of the A-pillar inner panel 12 is pulled by the first buckle 32 through the first pull belt 31, and the bottom end is pulled by the second buckle 34 through the second pull belt 33, and the upper and lower ends are simultaneously applied. The traction force forcibly limits the deployment freedom of the airbag 2, eliminates the risk of lateral deviation or torsion, and ensures that the airbag 2 accurately breaks through the weakened groove 11 of the A-pillar interior guard plate 13 along the preset angle and deploys outward. The structure acts on the two ends of the longitudinal extension area of ​​the airbag 2 through the separate first pull strap 31 unit and the second pull strap 33 unit, respectively, to form a three-dimensional constraint net covering the entire length of the airbag 2 while avoiding interference between the pull straps, so that the airbag 2 maintains its morphological stability during high-speed expansion, thereby effectively covering the blind spot at the intersection of the driver's airbag 93 and the side air curtain 94.

[0024] Furthermore, the vehicle body A-pillar 1 also includes an A-pillar outer panel 14, the A-pillar inner panel 12 is located in front of the left front door of the vehicle body 1, and the A-pillar outer panel 14 is located at the top of the left front door of the vehicle body 1. The A-pillar outer panel 14 and the top of the A-pillar inner panel 12 are integrally formed and together constitute the supporting frame of the left front door of the vehicle body 1.

[0025] Through the implementation of the above-described automotive airbag system embodiment, the A-pillar outer panel 14 is positioned at the top of the left front door of vehicle body 1 and is integrally formed with the top of the A-pillar inner panel 12. Together, they form the integral load-bearing frame of the left front door of vehicle body 1. This integrated structure significantly enhances the bending rigidity and torsional stability of the top of the left front door of vehicle body 1. The A-pillar outer panel 14 and the A-pillar inner panel 12 form a continuous load transfer path. When the vehicle is subjected to side impact or top pressure, the integrally formed connection nodes effectively disperse stress, preventing frame deformation caused by localized stress concentration, and significantly improving the overall structural strength and durability of the left front door of vehicle body 1.

[0026] Furthermore, a generator airbag 5 is arranged between the airbag 2 and the gas generator 4, the generator airbag 5 is fastened to the airbag 2, the gas generator 4 is arranged at the top end of the generator airbag 5, the air duct 41 is connected to the bottom end of the generator airbag 5, and the gas generator 4 is connected to the air duct 41 through the generator airbag 5.

[0027] Furthermore, the gas generating assembly also includes a first fastening ring 51 and a second fastening ring 52. The first fastening ring 51 is arranged at the top of the generator airbag 5 and fastens the top of the generator airbag 5 to the safety airbag 2. The second fastening ring 52 is arranged at the bottom of the generator airbag 5 and fastens the bottom of the generator airbag 5 to the safety airbag 2.

[0028] Through the implementation of the above-described automotive airbag system embodiment, the generator bag 5 serves as an intermediate buffer between the airbag 2 and the gas generator 4. The top of the generator bag 5 is connected to the gas generator 4, and the bottom is connected to the air duct 41, achieving a transition in the gas transmission path. The first fastening ring 51 secures the top of the generator bag 5 to the airbag 2, forming a high-pressure sealing barrier to prevent high-temperature gas from directly impacting the airbag 2 fabric. Meanwhile, the second fastening ring 52 secures the bottom of the generator bag 5 to the airbag 2, ensuring the stability of the interface with the air duct 41. This dual-ring fastening mechanism ensures that the generator bag 5 deforms synchronously with the airbag 2 throughout the inflation process, effectively preventing localized stress concentration caused by the direct impact of the gas generator 4 on the airbag 2. Furthermore, the pressure buffering and temperature diffusion within the generator bag 5 significantly improve the uniformity and stability of gas transmission to the airbag 2.

[0029] Furthermore, an air cavity is formed between the inner wall and the outer wall of the air guide tube 41, the generator air bag 5 is connected to the air cavity, a plurality of air holes are provided on the inner wall of the air guide tube 41, and an air inlet corresponding to the air holes is provided on the air bag 2. The gas generating assembly also includes a third fastening ring for fastening the air guide tube 41 and the air bag 2.

[0030] Through the implementation of the above-mentioned automobile airbag system embodiment, the air duct 41 is used to form an air cavity between the inner wall and the outer wall of the tube to construct a gas temporary storage and distribution space. The gas generated by the generator airbag 5 first enters the air cavity to complete pressure equalization. The gas in the air cavity is then diverted through a number of air holes provided on the inner wall of the air duct 41 to achieve multi-channel synchronous gas supply corresponding to the preset air inlet on the airbag 2. The third fastening ring forcibly locks the joint between the air duct 41 and the airbag 2, which not only prevents the high-pressure gas in the air cavity from leaking from the interface, but also ensures that each air hole is precisely aligned with the axial position of the corresponding air inlet. This structure eliminates the uneven inflation caused by gas flow rate pulsation through the triple effects of air cavity pressure equalization buffering, air hole directional diversion and sealing positioning of the third fastening ring, ensuring that each area of ​​the airbag 2 expands synchronously and maintains morphological integrity.

[0031] Furthermore, a generator bracket 6 is provided on the A-pillar inner panel 12, and the generator airbag 5 is fixed on the generator bracket 6. A first clip 7 and a second clip 8 are also provided on the A-pillar inner panel 12. The first clip 7 is connected to the top of the airbag 2, and the second clip 8 is connected to the bottom of the airbag 2.

[0032] Through the implementation of the above-described automotive airbag system embodiment, the generator bracket 6 provides a stable intermediate positioning support point for the generator airbag 5 on the A-pillar inner panel 12, directly resisting the reverse force generated by the gas generator 4 during the inflation of the airbag 2. Simultaneously, the first buckle 7 forms an upper fixing point with the top of the airbag 2, and the second buckle 8 forms a lower fixing point with the bottom of the airbag 2. This constrains the airbag 2's displacement freedom at the top, middle, and bottom during inflation at three levels. Thus, the generator bracket 6 suppresses radial oscillation of the generator airbag 5, the first buckle 7 limits the upward displacement of the top of the airbag 2, and the second buckle 8 prevents the downward displacement of the bottom of the airbag 2. This eliminates axial deformation of the airbag 2, ensuring that the airbag 2 accurately inflates along the length of the A-pillar inner panel 12 without twisting or deflection.

[0033] The present invention also discloses a car, which includes a seat assembly 91, a steering wheel 92 located in front of the seat assembly 91, an airbag 93 arranged in the steering wheel 92, and a side airbag curtain 94 located on the left side of the seat assembly 91. The car 9 also includes the above-mentioned frontal offset impact car airbag system, and the coverage area of ​​the airbag 2 after deployment is the blind spot at the intersection angle of the airbag 93 and the side airbag curtain 94.

[0034] The present invention also discloses a control method, which uses the above-mentioned automobile airbag system for frontal offset collision, and the control method includes: The bias detection sensor is used to collect the vehicle collision acceleration signal and collision angle signal in real time, and the acceleration signal and collision angle signal are dynamically coupled and analyzed; When the coupling analysis results simultaneously meet the conditions that the acquired acceleration is greater than the preset acceleration threshold and the collision angle is within the preset angle range, a differentiated detonation command is generated; Based on the airbag harness 42 , the collision energy characteristic value carried by the differentiated detonation command is generated into a segmented voltage pulse signal and transmitted to the gas generator 4 ; The gas generator 4 dynamically adjusts the gas generation rate according to the segmented voltage pulse signal, and fills the airbag 2 with high-pressure gas in a step-by-step manner through the air duct 41; When the airbag 2 enters the primary expansion stage, the drawstring assembly 3 remains in a relaxed state, allowing the airbag 2 to quickly break through the weakened groove 11; When the airbag 2 enters the secondary expansion stage, the pull strap assembly 3 is stretched under tension to pull the two ends of the airbag 2 to expand along the preset angles constrained by the upper and lower parts of the vehicle body A-pillar 1 until the blind spot of the main driver's airbag 93 is covered.

[0035] Through the implementation of the control method described above, the offset detection sensor collects real-time collision acceleration and collision angle signals and dynamically couples them for analysis, accurately identifying frontal offset collision characteristics that meet preset acceleration thresholds and angle ranges. Based on this, a differentiated detonation command is generated, carrying a collision energy characteristic value. The airbag harness 42 converts the collision energy characteristic value into a segmented voltage pulse signal, which is transmitted to the inflator 4. This drives the inflator 4 to dynamically adjust the gas generation rate based on the signal characteristics. High-pressure gas is introduced into the airbag 2 in a stepped manner through the air duct 41, causing the airbag 2 to rapidly break through the weakened groove 11 during the primary expansion phase (where the drawstring assembly 3 remains relaxed to reduce resistance). During the secondary expansion phase, the drawstring assembly 3 is tensioned, forcing the ends of the airbag 2 to deploy at predetermined angles, defined by the upper and lower constraints of the vehicle's A-pillar 1. This phased control mechanism ensures the timeliness of the airbag 2 breaking through the weakened groove 11 and the accuracy of the deployment trajectory through the closed-loop logic of precise identification, command matching, rate adjustment and relaxation-straightening state switching, fully covering the blind spot of the main driver's airbag 93.

[0036] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; and all these modifications and replacements should fall within the scope of protection of the present invention.

Claims

1. A frontal offset collision vehicle airbag system, characterized in that: The automobile airbag system comprises: The mounting unit includes a vehicle body A-pillar, wherein the vehicle body A-pillar is provided with a weakened wire groove; An airbag unit, comprising an airbag, a gas generating assembly, and a drawstring assembly, wherein the airbag is disposed within the vehicle body A-pillar, and the ends of the airbag are connected to the upper and lower portions of the vehicle body A-pillar, respectively, via the drawstring assembly, so that the airbag is deployed along a preset angle after being inflated; The gas generating assembly includes a gas generator arranged in the A-pillar of the vehicle body and a bias detection sensor integrated on the vehicle. The gas generator is fastened to the airbag. The gas generator is provided with an air duct which is sleeved on the airbag, and the gas generator supplies air to the interior of the airbag through the air duct. The gas generator is also provided with an airbag wiring harness, and the gas generator is electrically connected to the bias detection sensor through the airbag wiring harness.

2. The automobile airbag system for frontal offset collision according to claim 1, characterized in that: The A-pillar of the vehicle body includes an A-pillar inner panel and an A-pillar interior guard panel arranged on the outside of the A-pillar inner panel, an assembly gap is formed between the A-pillar inner panel and the A-pillar interior guard panel, the airbag is fixed in the assembly gap between the A-pillar inner panel and the A-pillar interior guard panel, and the two ends of the airbag are respectively connected to the upper and lower parts of the A-pillar inner panel through the pull belt assembly, and the weakened wire groove is opened on the A-pillar interior guard panel.

3. The automobile airbag system for frontal offset collision according to claim 2, characterized in that: The drawstring assembly includes a first drawstring unit and a second drawstring unit, the first drawstring unit includes a first drawstring and a first buckle, the first buckle is fixed to the upper portion of the A-pillar inner panel, the second drawstring unit includes a second drawstring and a second buckle, the second buckle is fixed to the lower portion of the A-pillar inner panel; The airbag is arranged along the length direction of the A-pillar inner panel, and the top end of the airbag is connected to the first buckle through the first drawstring, and the bottom end of the airbag is connected to the second buckle through the second drawstring.

4. The automobile airbag system for frontal offset collision according to claim 2, characterized in that: The vehicle body A-pillar also includes an A-pillar outer panel, the A-pillar inner panel is located in front of the left front door of the vehicle body, the A-pillar outer panel is located at the top of the left front door of the vehicle body, and the A-pillar outer panel and the top end of the A-pillar inner panel are integrally formed and together constitute the supporting frame of the left front door of the vehicle body.

5. The automobile airbag system for frontal offset collision according to claim 2, characterized in that: A generator airbag is arranged between the safety airbag and the gas generator, the generator airbag is fastened to the safety airbag, the gas generator is arranged at the top end of the generator airbag, the air duct is connected to the bottom end of the generator airbag, and the gas generator is connected to the air duct through the generator airbag.

6. The automobile airbag system for frontal offset collision according to claim 5, characterized in that: The gas generating assembly also includes a first fastening ring and a second fastening ring. The first fastening ring is arranged at the top of the generator airbag and fastens the top of the generator airbag to the safety airbag. The second fastening ring is arranged at the bottom of the generator airbag and fastens the bottom of the generator airbag to the safety airbag.

7. The automobile airbag system for frontal offset collision according to claim 5, characterized in that: An air cavity is formed between the inner wall and the outer wall of the air duct, the generator air bag is connected to the air cavity, a plurality of air holes are provided on the inner wall of the air duct, and the air bag is provided with an air inlet corresponding to the air holes one by one. The gas generating assembly also includes a third fastening ring for fastening the air duct and the air bag.

8. The automobile airbag system for frontal offset collision according to claim 5, characterized in that: A generator bracket is provided on the inner panel of the A-pillar, and the generator airbag is fixed on the generator bracket. A first clip and a second clip are also provided on the inner panel of the A-pillar, wherein the first clip is connected to the top of the airbag, and the second clip is connected to the bottom of the airbag.

9. An automobile comprising a seat assembly, a steering wheel located in front of the seat assembly, an airbag disposed in the steering wheel, and a side curtain airbag located on the left side of the seat assembly, characterized in that: The automobile further comprises the automobile airbag system for frontal offset collision as claimed in any one of claims 1 to 8, and the coverage area of ​​the airbag after deployment is the blind area of ​​the intersection angle between the airbag and the side air curtain.

10. A control method using the automobile airbag system for frontal offset collision according to any one of claims 1 to 8, characterized in that: The control method includes: The bias detection sensor is used to collect the vehicle collision acceleration signal and the collision angle signal in real time, and the acceleration signal and the collision angle signal are dynamically coupled and analyzed; When the coupling analysis results simultaneously meet the conditions that the acquired acceleration is greater than the preset acceleration threshold and the collision angle is within the preset angle range, a differentiated detonation command is generated; Based on the airbag wiring harness, the collision energy characteristic value carried by the differentiated detonation command is used to generate a segmented voltage pulse signal and transmit the signal to the gas generator; The gas generator dynamically adjusts the gas generation rate according to the segmented voltage pulse signal, and fills the airbag with high-pressure gas in a step-by-step manner through the air duct; When the airbag enters the primary expansion stage, the drawstring assembly remains in a relaxed state so that the airbag quickly breaks through the weakened groove; When the airbag enters the secondary expansion stage, the drawstring assembly is stretched straight by tension to pull the two ends of the airbag to expand along the preset angles constrained by the upper and lower A-pillars of the vehicle body until the airbag blind spot of the main driver is covered.

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