Intelligent emergency floating and wading self-lifting air bag safety system for new energy vehicles

Abstract

The application provides a new energy vehicle intelligent emergency floating and wading self-lifting air bag safety system, and relates to the technical field of new energy vehicles, comprising a plurality of air bag assemblies arranged below the vehicle body platform, a high-pressure inflation assembly, a joint control pipeline system, a data acquisition unit, an independent power supply unit and a control unit. The system distributes the air bag assemblies in a ring shape under the chassis, the joint control pipeline system realizes independent inflation and deflation of each air bag, the independent power supply unit is isolated from the main power supply and is awakened during wading. The control unit determines wading according to the contact pressure at the bottom of each air bag, the vehicle body pose and the wading signal, first links all the air bags to quickly land and form support after determining wading, and then calculates the pointing vector corresponding to the maximum inclination direction based on the vehicle body pose plane, and differentiates and independently inflates the air bags on both sides of the direction to realize dynamic self-balancing jacking.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles. Background Technology

[0002] In recent years, extreme rainstorms have occurred frequently in cities, causing flooding in underground garages and water accumulation in low-lying roads, resulting in damage to a large number of vehicles. This is a high-frequency pain point that car owners, the car insurance industry, and car manufacturers have been unable to solve for a long time.

[0003] Currently, the most common vehicle waterproofing solutions on the market mainly fall into the following three categories: The first category is passive water-blocking devices, such as car covers, slicks, and slicks. These devices can only block splashing rainwater or short-term shallow water accumulation. Once the water depth continues to rise, the water can overcome the water-blocking structure, and they cannot effectively prevent the vehicle from being submerged.

[0004] The second category is mechanical lifting devices, such as portable jacks and mechanical support frames. Although these devices can physically lift vehicles, their operation relies entirely on manual on-site work, making them unusable in emergency situations such as heavy rain and flooding. Furthermore, their lifting method involves single-point or partial support, which can easily cause deformation of the chassis structure and cannot achieve a smooth overall lifting of the vehicle.

[0005] The third type is emergency buoyancy airbags. Their principle is to release an airbag and use the buoyancy of the water to lift the vehicle when it falls into water or is deeply submerged. However, this type of device has the following inherent drawbacks: First, there is a fundamental contradiction between the required buoyancy volume and the vehicle's storage space. For a passenger car weighing approximately 1.5–2.5 tons, the airbag may displace at least 1.5–2.5 cubic meters of water, resulting in an extremely large deployed airbag volume. Second, the technical challenges of folding, storage, and reuse remain unresolved. Due to the aforementioned volume contradiction, the buoyancy airbag must be folded and compressed to a high degree in its uninflated state to barely fit into a limited space. After one use, the airbag cannot be reliably reused through ordinary folding. Third, reliance on water buoyancy leads to stringent response conditions. Existing buoyancy airbag devices require the vehicle to be in deep water with a water level sufficient to submerge the airbag body in order to generate effective buoyancy. This is a passive response protection and cannot actively intervene in the early stages of rising water. In complex conditions such as shallow water, mud, and fluctuating water levels, its buoyancy effect is uncertain and its reliability is insufficient.

[0006] In addition, with the popularization of new energy vehicles, their power batteries and electronic control systems are more sensitive to water immersion. The risk of short circuits and thermal runaway after being submerged in water is much higher than that of fuel vehicles. However, new energy vehicles also bring new structural features - high chassis flatness, elimination of traditional transmission and exhaust systems, and significantly increased bottom space, which provides conditions for arranging reusable safety systems under the chassis.

[0007] However, there is currently no vehicle anti-bubble safety system in the industry that can fully utilize the advantages of the chassis space of new energy vehicles and has features such as fully automatic triggering, reusability, and independent operation when the engine is off. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides an intelligent emergency floating and wading self-lifting airbag safety system for new energy vehicles. It solves the technical problems of existing vehicle waterproofing devices being unable to automatically respond to emergencies when the vehicle is off, being unable to achieve high load-bearing capacity and repeated lifting within a limited chassis space, and being unable to simultaneously adapt to both hard ground lifting and deep water buoyancy in complex wading conditions.

[0009] To achieve the above objectives, the present invention provides the following technical solution: The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles includes several airbag assemblies, high-pressure inflation assemblies, interconnection pipeline systems, data acquisition units, independent power supply units, and control units located under the vehicle chassis. The interconnected pipeline system is connected between the high-pressure inflation assembly and the airbag assembly, and is used to independently control the inflation and deflation of each high-pressure inflation assembly; the independent power supply unit is used to power the data acquisition unit, the control unit, and the interconnected pipeline system; The data acquisition unit is used to acquire the contact pressure at the bottom of each airbag assembly, the coordinate point set for feedback of the vehicle's position and posture, and the wading situation. The control unit performs self-balancing control of the airbag assembly based on the water wading situation. Specifically, the control unit calculates the vehicle body posture plane based on the coordinate point set, and determines the pointing amount in the vehicle body posture plane, starting from a preset reference point, with the maximum tilt angle and pointing towards the ground, and controls the airbag assemblies located on both sides of the pointing amount to inflate based on the pointing amount. Several airbag assemblies form an annular region, and the preset reference point is located inside the annular region and also within the vehicle body's position plane.

[0010] Preferably, the inflation of the airbag assembly located on both sides of the pointing direction based on the pointing amount control specifically includes the following steps: The coordinates of a reference point are determined in the vehicle body pose plane based on the mounting point location of the airbag assembly on the vehicle chassis; the coordinates of a preset reference point are determined in the vehicle body pose plane based on the location of the center point of the vehicle chassis. Using a preset reference point as the origin, calculate the first polar angle of all preset reference points in the direction to the reference point, and arrange them in ascending order according to the size of the first polar angle to construct an ordered set; then calculate the standard polar angle of the pointing quantity, and determine the calibration interval of the standard polar angle in the ordered set through binary search; based on the distance ratio of the standard polar angle to the two endpoints of the calibration interval, proportionally control the inflation of the airbag assemblies located on both sides of the pointing quantity.

[0011] Preferably, the airbag assembly includes: The mounting component has an air intake interface fixedly installed at its bottom; An airbag retainer is provided, the top end of which is fixedly installed with the bottom end of the air intake interface, the airbag retainer has an airbag space inside, and the bottom end of the airbag retainer is connected to the airbag space. An airbag assembly, comprising a first airbag portion and a second airbag portion, wherein the first airbag portion is annular and its first end is sealed and fixed to the outside of the airbag retainer, and its second end is connected to the top of the second airbag portion; the second airbag portion comprises a plurality of foldable inflation units integrally arranged along the axial direction of the airbag retainer; a pad is fixedly connected to the bottom end of the lowest foldable inflation unit.

[0012] Preferably, the mounting component includes: a U-shaped support, an inner support fixedly mounted on the inner side of the first side plate of the U-shaped support, and a locking nut provided on the second side plate of the U-shaped support; the air intake interface component includes: a main body, a flange ring fixedly connected to the outer side of the main body, the flange ring dividing the main body into a first section close to the U-shaped support and a second section away from the U-shaped support along the axial direction of the main body, and an air intake pipe provided on the side of the first section.

[0013] Preferably, a number of support members are fixedly provided at the top of the flange ring and the bottom of the U-shaped support.

[0014] Preferably, a pressure sensor is fixedly connected to the bottom of the pad, and the data acquisition unit obtains the contact pressure at the bottom of the airbag assembly through the pressure sensor.

[0015] Preferably, a guide ring is fixedly provided at the top of the second airbag portion, and the guide ring slides in contact with the inner wall of the airbag retainer.

[0016] Preferably, the high-pressure gas filling assembly is a high-pressure nitrogen storage cylinder.

[0017] Preferably, the interconnected pipeline system includes pipelines and a centralized control valve group, where one valve body in the centralized control valve group corresponds to one airbag assembly, and the centralized control valve group is controlled by a multi-channel PWM controller.

[0018] Preferably, the water wading status is obtained based on physical float sensing and capacitive electronic liquid level sensing.

[0019] This invention provides an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles. It has the following beneficial effects: 1. The intelligent emergency floating and wading self-lifting airbag safety system for new energy vehicles provided by this invention arranges several airbag assemblies forming a ring-shaped area under the vehicle chassis near the periphery. It is equipped with a high-pressure inflation assembly, a control pipeline system, a data acquisition unit, an independent power supply unit, and a control unit. The control pipeline system realizes independent inflation and deflation control of each airbag assembly. The independent power supply unit is completely isolated from the vehicle's main power supply and is woken up with low power consumption when wading. The control unit, based on the contact pressure at the bottom of each airbag, the set of vehicle body posture coordinates, and the wading situation obtained by the data acquisition unit, first activates all airbags to quickly land and form a force state after determining wading. Then, based on the vehicle body posture plane, it calculates the pointing amount corresponding to the maximum tilt direction and performs differentiated independent inflation on the airbags located on both sides of the pointing amount, thereby realizing dynamic self-balancing lifting. Addressing the shortcomings of existing technologies, such as the inability of passive water-blocking devices to cope with continuous water accumulation, the reliance on manual operation for mechanical lifting and the inability to shut off the engine for emergency response, the contradiction between the size and storage of traditional buoyancy airbags and their reliance solely on passive buoyancy in deep water, and the tendency for single-point local support to cause vehicle tilting and deformation, this solution utilizes a ring-shaped distributed airbag layout and a self-balancing control algorithm based on real-time attitude perception to automatically and smoothly lift the vehicle as a whole under complex terrain conditions. It simultaneously meets the needs of both active lifting in shallow water and emergency floating in deep water, effectively preventing damage to the chassis and battery from water immersion, and providing the vehicle with fully automatic, highly reliable, and multi-scenario emergency protection capabilities. Attached Figure Description

[0020] Figure 1 This is a perspective view of an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles proposed in this invention. Figure 2 This is a front view of an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles proposed in this invention. Figure 3 for Figure 2 Cross-sectional view of section line AA in the middle; Figure 4 for Figure 3 Enlarged view of a section at point B in the middle; Figure 5 This is a three-dimensional schematic diagram of the mounting base for an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles proposed in this invention. Figure 6 This is a schematic diagram showing the distribution of an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles proposed in this invention. Figure 7This is a schematic diagram of the control distribution of an intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles proposed in this invention.

[0021] The components include: 1. Airbag assembly; 2. Interconnected piping system; 3. High-pressure inflation assembly; 101. U-shaped support; 102. Inner support; 103. First locking nut; 104. Main body; 1041. Second section; 1042. First section; 105. Flange ring; 106. Inlet pipe; 107. Support; 108. Airbag retainer; 109. Locking nut; 1010. Inner liner ring; 1011. Ring buckle; 1012. First airbag section; 1013. Guide ring; 1014. Second airbag section; 1015. Pad; 1016. Pressure sensor. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0023] like Figures 1-7 As shown, this embodiment of the invention provides an intelligent emergency buoyancy and wading self-lifting airbag safety system for new energy vehicles. It is automatically triggered when the vehicle is parked and encounters rising ground water, smoothly lifting the entire vehicle to remove the chassis and power battery from the submerged water. It also provides emergency reserve buoyancy to delay the vehicle's sinking when it accidentally enters deep water, buying time for occupants to respond to emergencies. Specifically, it includes: several airbag assemblies 1, a high-pressure inflation assembly 3, a control pipeline system 2, a data acquisition unit, an independent power supply unit, and a control unit, all located under the vehicle chassis.

[0024] like Figure 6As shown, several airbag assemblies 1 are distributed near the outer perimeter of the vehicle body, and the airbag assemblies 1 form a ring-shaped area. The control pipeline system 2 is connected between the high-pressure inflation assembly 3 and the airbag assembly 1, and is used to independently control the inflation and deflation of each high-pressure inflation assembly 3. For example, the control pipeline system 2 includes pipelines and a centralized control valve group. One valve body in the centralized control valve group corresponds to one airbag assembly 1. The centralized control valve group is jointly controlled by a multi-channel PWM controller. The purpose of this design is to ensure that the airbag assemblies 1 cooperate in lifting and lowering, and to ensure that the vehicle body can maintain its position and posture regardless of the complexity of the ground conditions when it is being lifted, thus avoiding the problem of the vehicle tilting as a whole. The independent power supply unit is a lithium battery module, which is completely isolated from the vehicle power supply (the main battery pack of the new energy vehicle). It operates in low-power standby mode during normal operation. When water wading is detected, the independent power supply unit is activated. The independent power supply unit supplies power to the data acquisition unit, control unit, and interconnection pipeline system 2. The data acquisition unit is used to acquire the contact pressure at the bottom of each airbag assembly 1, the coordinate point set used to feedback the vehicle's position and posture, and the water wading situation.

[0025] The control unit performs self-balancing control of the airbag assembly 1 based on the wading conditions; that is, when the data acquisition unit obtains that the wading conditions are wading, the control unit simultaneously controls multiple airbag assemblies 1 to pre-inflate. This pre-inflation causes the airbag assembly 1 to extend rapidly, so that its bottom contacts the ground and forms a force-bearing state; when the measured value of the contact pressure at the bottom of the corresponding airbag assembly 1 exceeds a preset threshold range, the pre-inflation is completed; while pre-inflating all airbag assemblies 1, self-balancing control of the airbag assembly 1 is also performed, that is, the inflation of the airbag assembly 1 after the pre-inflation is completed is a controlled inflation state.

[0026] The self-balancing control airbag assembly 1 specifically involves: the control unit calculating the vehicle body posture plane based on a set of coordinate points, determining the direction of maximum tilt and pointing towards the ground from a preset reference point within the vehicle body posture plane, and controlling the inflation of the airbag assemblies 1 located on both sides of the direction of the tilt based on this direction. Several airbag assemblies 1 form a ring-shaped domain, with the preset reference point located inside the ring-shaped domain and also within the vehicle body posture plane.

[0027] like Figure 7 As shown, a set of coordinate points is acquired based on an automotive-grade MEMS IMU module (such as the MicroStrain 3DM-GX3 series or HBK MV5-AR). The plane formed by the actual positions of this set of coordinate points is the plane where the rigid body of the vehicle is located. The vehicle pose plane formed by the set of coordinate points is solved based on the singular value decomposition (SVD) of the covariance matrix. Then, the pointing amount in the vehicle pose plane, starting from a preset reference point, with the maximum tilt angle and pointing towards the ground, is determined.

[0028] Specifically, the algorithm steps for determining the pointing amount with the maximum tilt angle and pointing towards the ground within the vehicle body pose plane, starting from a preset reference point, are as follows: Project the center point of the vehicle chassis along the Z-axis of the world coordinate system onto the vehicle posture plane. The projection point is the preset reference point O, ensuring that the reference point is located on both the vertical line of the vehicle center and in the posture plane.

[0029] Using the preset reference point O as the center, a unit circle is constructed within the vehicle body pose plane. All points on this unit circle represent the vehicle body's posture feature points at a unit distance. The point with the smallest Z-axis coordinate value on this unit circle is extracted as the standard point P. min .

[0030] Point from the preset reference point O to the standard point P min A directed line segment is defined as a pointer D. (like Figure 7 (As shown by line segment 0a in the middle). This pointer represents the direction of maximum tilt descent of the current vehicle pose plane relative to the horizontal plane, that is, the direction in which the vehicle has the maximum pitch or roll gradient.

[0031] Specifically, the inflation of the airbag assembly 1 located on both sides of the pointing direction based on the pointing amount control includes the following steps: coordinate mapping and reference establishment: First, establish a world coordinate system OXYZ, where the OZ axis is perpendicular to the horizontal plane and pointing upwards.

[0032] Obtain the coordinates of the reference point: Obtain the fixed mounting point positions of each airbag assembly on the vehicle chassis. To eliminate height interference caused by vehicle tilt, orthographic projection along the OZ axis of the world coordinate system is used to vertically project each mounting point onto the current vehicle pose plane Π. The projected points are the reference points corresponding to each airbag assembly.

[0033] Obtain the coordinates of the preset reference point: The position of the center point of the vehicle chassis is obtained by orthogonal projection along the OZ axis of the world coordinate system onto the vehicle posture plane Π. The projection point is the preset reference point O.

[0034] It should be noted that the reference points and preset benchmark points obtained by the above orthographic projection method are all located in the same spatial geometric plane (i.e., the vehicle body posture plane Π currently being measured), which ensures that subsequent angle calculations are performed on the same benchmark plane and avoids geometric distortion.

[0035] Constructing polar-angle ordered sets: A local polar coordinate system is constructed within the vehicle body pose plane Π, with the preset reference point O as the pole (origin).

[0036] Calculate the distance from the preset reference point O to each reference point P. i The azimuth angle is defined as the first polar angle α. i .

[0037] All calculated first polar angles αi are sorted in ascending order of their numerical values ​​to form an ordered set of polar angles: S={α1,α2,…,α...} n}(where α1<α2<⋯<α) n ).

[0038] Determine the calibration interval of the pointer: The polar angle of the aforementioned "direction" (i.e., the direction of maximum tilt and descent of the vehicle body) in the polar coordinate system is calculated and defined as the standard polar angle θ.

[0039] In the ordered set of polar angles S, the calibration interval of the standard polar angle θ is determined by binary search (or linear traversal). Specifically: Find the one that satisfies α i ≤θ≤α i+1 The two adjacent polar angles α i and α i+1 ; Then the calibration interval [α] i ,α i+1 The two reference points corresponding to the direction of the direction are the two airbag assemblies (i.e., the first airbag and the second airbag) located on both sides of the direction of the direction.

[0040] Boundary condition handling: If θ is exactly equal to a certain first polar angle α k If the pointing direction is precisely aligned with the installation direction of a certain airbag, then that airbag is determined to be the priority driving target, and the airbag on the smaller included angle side of its left and right adjacent polar angles is taken as the auxiliary driving target.

[0041] Differential inflation control based on distance ratio: Based on the standard polar angle θ and the two endpoints α of the calibration interval i α i+1 The geometric distance ratio, for the first and second airbags located on both sides of the pointing amount (e.g. Figure 7 Differentiated proportion control is performed on the airbag assemblies corresponding to points d1 and d6 in the middle.

[0042] Calculate the distance ratio coefficient: Let α i Corresponding to the first airbag, α i+1 Corresponding to the second airbag. The inflation weighting coefficient λ1 of the first airbag and the inflation weighting coefficient λ2 of the second airbag are defined as follows: ; where λ1+λ2=1.

[0043] Inflation ratio: Inflation control commands for the first and second airbags are generated based on the weighting coefficients, respectively: Set the baseline inflation speed to V base (or baseline duty cycle); The real-time inflation rate of the first airbag is V1 = λ1. base ; The real-time inflation rate of the second airbag is V2=λ2. Vbase .

[0044] When the standard polar angle θ is closer to a certain end polar angle (i.e., the direction of the airbag is more biased towards a certain airbag), the weighting coefficient λ of that end airbag is larger, resulting in a higher inflation speed. This achieves the goal of "the airbag on the side that is tilted will rise faster" to quickly correct the vehicle's attitude.

[0045] During inflation, the vehicle's pose plane Π is updated in real time via an attitude sensor, and the above steps are repeated. When the magnitude of the pointing quantity (or the rate of change of the standard polar angle) approaches zero, and the normal vector of the vehicle's pose plane coincides with the world coordinate system OZ axis, it is determined that the vehicle has reached the preset level state.

[0046] It is understandable that, based on the above, the airbag assembly controlled by the acquired data differs each time inflation is performed; for example... Figure 7 As shown, in this state, the airbag assembly 1 corresponding to points d1 and d6 is inflated for a preset time, such as 20S, 40S, or 60S; the data is reacquired and the above process is re-executed, so as to ensure that the vehicle body is basically in a horizontal state (the principle is: each time only the airbag assembly 1 on the lower side of the vehicle body is inflated).

[0047] In one specific embodiment, the airbag assembly 1 includes: a mounting component, an air intake interface component, an airbag retainer 108, and an airbag component.

[0048] The mounting component adopts a quick-installation structure, making it easy to install on the chassis beam. An air intake interface is fixedly installed at the bottom of the mounting component. The top of the airbag retainer 108 is fixedly installed with the bottom of the air intake interface. An airbag space is provided inside the airbag retainer 108, and the bottom of the airbag retainer 108 communicates with the airbag space. The airbag retainer 108 is used to store the airbag component in its retracted state. The airbag component includes a first airbag part 1012 and a second airbag part 1014. The first airbag part 1012 is annular, and its first end is sealed and fixed to the outside of the airbag retainer 108. Its second end is connected to the top of the second airbag part 1014. The second airbag part 1014 includes several folding inflation units integrally arranged along the axial direction of the airbag retainer 108. A pad 1015 is fixedly connected to the bottom of the lowest folding inflation unit.

[0049] like Figure 3 As shown, high-pressure gas entering from the air intake interface passes through the air intake interface and enters the airbag space of the airbag retainer 108, thereby inflating the airbag assembly. First, the first airbag portion 1012 of the airbag assembly is pushed out of the airbag space. The second airbag portion 1014, located at the end of the first airbag portion 1012, is also naturally pushed out of the airbag space. Then, the first airbag portion 1012 and the second airbag portion 1014 are inflated and hardened. When the pad 1015 at the bottom of the second airbag portion 1014 contacts the ground, the reaction force of the first airbag portion 1012 and the second airbag portion 1014 exerts an upward lifting force on the vehicle body. The first airbag portion 1012 is fixed by an inner liner ring 1010 and a ring buckle 1011, as shown... Figure 4 As shown, the airbag retainer 108 has a stepped portion on its side. The first airbag portion 1012 is sleeved on the outside of the airbag retainer 108. The inner liner ring 1010 is composed of two (or more) arc-shaped parts and is arranged on the outside of the first airbag portion 1012. The ring buckle 1011 is threadedly connected to the airbag retainer 108. The airbag retainer 108 presses the inner liner ring 1010 upward. The top of the inner liner ring 1010 is restricted by the stepped portion and cannot move upward. It can only contract radially inward to press the first airbag portion 1012, thereby achieving a sealed fixation between the first airbag portion 1012 and the airbag retainer 108.

[0050] Understandably, by designing the airbag retainer 108, it can serve as both a direct connection to the airbag component and a storage component for the airbag component. Furthermore, the multi-segment and multi-section design of the first airbag section 1012 and the second airbag section 1014 allows the airbag component to extend to a relatively long length, reaching 35-40 cm, while remaining very short when folded, around 5 cm, without affecting the normal use of the vehicle after installation.

[0051] In one specific embodiment, the mounting component includes: a U-shaped support 101, an inner support 102 fixedly mounted on the inner side of the first side plate of the U-shaped support 101, the inner support 102 being able to snap into the inner groove of the main beam of the vehicle body, a first locking nut 103 provided on the second side plate of the U-shaped support 101, after the first locking nut 103 is tightened, one end of which can abut against the outer side of the main beam of the vehicle body, thereby realizing the fixed installation of the mounting component and the main beam of the vehicle body; the air intake interface component includes: a main body 104, a flange ring 105 fixedly connected to the outer side of the main body 104, the flange ring 105 dividing the main body 104 into a first segment 1042 close to the U-shaped support 101 and a second segment 1041 away from the U-shaped support 101 along the axial direction of the main body 104, and an air intake pipe 106 provided on the side of the first segment 1042.

[0052] like Figure 3 As shown, the top of the airbag retainer 108 is threaded into the second section 1041, and the airbag retainer 108 is locked to the main body 104 by the locking nut 109.

[0053] In one specific embodiment, a plurality of support members 107 are fixedly provided on the top of the flange ring 105 and the bottom of the U-shaped support member 101. The plurality of support members 107 are used to increase the structural strength of the main body 104 so that it can support the vehicle body to rise.

[0054] In one specific embodiment, a pressure sensor 1016 is fixedly connected to the bottom of the pad 1015, and the data acquisition unit obtains the contact pressure at the bottom of the airbag assembly 1 through the pressure sensor 1016.

[0055] When the bottom of the pad 1015 contacts the ground, the pressure sensor 1016 detects the pressure, which is collected by the data acquisition unit and sent to the control unit. If all pressure sensors 1016 fail to contact the ground, it indicates that the vehicle has accidentally entered deep water. All airbag assemblies 1 will then inflate to their maximum volume to allow the vehicle to float.

[0056] In one specific embodiment, a guide ring 1013 is fixedly provided on the top of the second airbag portion 1014. The guide ring 1013 slides with the inner wall of the airbag retainer 108. The guide ring 1013 is used to guide the second airbag portion 1014 neatly into the airbag retainer 108. When the first airbag portion 1012 and the second airbag portion 1014 are fully deployed, the guide ring 1013 is used to stabilize the junction of the first airbag portion 1012 and the second airbag portion 1014 to avoid irregular tilting of the airbag assembly 1.

[0057] In one specific embodiment, the high-pressure filling assembly 3 is a high-pressure nitrogen storage cylinder. The high-pressure nitrogen storage cylinder is filled quickly and can be kept on standby for a long time.

[0058] In one specific embodiment, wading conditions are acquired based on a physical float sensor and a capacitive electronic liquid level sensor. The physical float sensor and the capacitive electronic liquid level sensor provide dual protection; when either one senses a wading situation, the intelligent emergency buoyancy and wading self-elevating airbag safety system can respond.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles, characterized in that, include: Several airbag assemblies (1), high-pressure inflation assemblies (3), joint control pipeline system (2), data acquisition unit, independent power supply unit and control unit are installed under the vehicle chassis; The joint control pipeline system (2) is connected between the high-pressure inflation assembly (3) and the airbag assembly (1) and is used to independently control inflation and deflation of each of the high-pressure inflation assemblies (3); the independent power supply unit is used to power the data acquisition unit, the control unit, and the joint control pipeline system (2); The data acquisition unit is used to acquire the contact pressure at the bottom of each airbag assembly (1), the coordinate point set for feedback of the vehicle body posture, and the water wading situation; The control unit performs self-balancing control of the airbag assembly (1) based on the water wading situation. Specifically, the control unit calculates the vehicle body posture plane based on the coordinate point set, and determines the direction of the direction with the largest tilt angle and pointing towards the ground from the preset reference point in the vehicle body posture plane, and controls the airbag assembly (1) located on both sides of the direction of the direction to inflate based on the direction of the direction. Several airbag assemblies (1) form an annular region, and the preset reference point is located inside the annular region and also in the vehicle body pose plane.

2. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 1, characterized in that, The inflation of the airbag assembly (1) located on both sides of the direction ... Based on the mounting point position of the airbag assembly (1) on the vehicle chassis, determine the coordinates of the reference point in the vehicle posture plane; based on the position of the center point of the vehicle chassis, determine the coordinates of the preset reference point in the vehicle posture plane; Using the preset reference point as the origin, calculate the first polar angle of all preset reference points to the reference point and arrange them in ascending order of the size of the first polar angle to construct an ordered set; then calculate the standard polar angle of the pointing quantity and determine the calibration interval of the standard polar angle in the ordered set by binary search; based on the ratio of the distance between the standard polar angle and the two endpoints of the calibration interval, perform proportional control on the airbag assembly located on both sides of the pointing quantity (1) inflating.

3. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 1, characterized in that, The airbag assembly (1) includes: The mounting component has an air intake interface fixedly installed at its bottom; An airbag retainer (108) is provided, with its top end fixedly installed to the bottom end of the air inlet interface. An airbag space is provided inside the airbag retainer (108), and the bottom end of the airbag retainer (108) is connected to the airbag space. An airbag assembly, comprising a first airbag portion (1012) and a second airbag portion (1014), wherein the first airbag portion (1012) is annular and its first end is sealed and fixed to the outside of the airbag retainer (108), and its second end is connected to the top of the second airbag portion (1014), wherein the second airbag portion (1014) comprises a plurality of foldable inflation units integrally arranged along the axial direction of the airbag retainer (108); the bottom end of the lowest foldable inflation unit is fixedly connected to a pad (1015).

4. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 3, characterized in that, The mounting component includes: a U-shaped support (101), an inner support (102) is fixedly installed on the inner side of the first side plate of the U-shaped support (101), and a first locking nut (103) is provided on the second side plate of the U-shaped support (101); the air inlet component includes: a main body (104), a flange ring (105) is fixedly connected to the outer side of the main body (104), and the flange ring (105) divides the main body (104) into a first section (1042) close to the U-shaped support (101) and a second section (1041) away from the U-shaped support (101) along the axial direction of the main body (104), and an air inlet pipe (106) is provided on the side of the first section (1042).

5. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 4, characterized in that, Several support members (107) are fixedly installed on the top of the flange ring (105) and the bottom of the U-shaped support (101).

6. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 3, characterized in that: The bottom of the pad (1015) is fixedly connected to a pressure sensor (1016), and the data acquisition unit obtains the contact pressure at the bottom of the airbag assembly (1) through the pressure sensor (1016).

7. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 3, characterized in that: A guide ring (1013) is fixedly provided on the top of the second airbag part (1014), and the guide ring (1013) slides in cooperation with the inner wall of the airbag retainer (108).

8. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 1, characterized in that: The high-pressure gas filling assembly (3) is a high-pressure nitrogen storage cylinder.

9. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 1, characterized in that: The joint control pipeline system (2) includes pipelines and a centralized control valve group. One valve body in the centralized control valve group corresponds to one airbag assembly (1). The centralized control valve group is controlled by a multi-channel PWM controller.

10. The intelligent emergency floating and wading self-elevating airbag safety system for new energy vehicles according to claim 1, characterized in that: Water wading conditions are obtained based on physical float sensing and capacitive electronic liquid level sensing.

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