Safety belt electromagnetic lock catch, vehicle with safety belt electromagnetic lock catch and control method

Abstract

The embodiment of the invention provides a safety belt electromagnetic lock catch, a vehicle with the same and a control method, and relates to the technical field of vehicle safety. The safety belt electromagnetic lock catch comprises a lock catch head, the lock catch head comprises a shell and an electromagnetic connecting plate, the shell is provided with a containing space with an opening in one end, and the electromagnetic connecting plate is connected with the side wall of the shell; the spring bolt can penetrate through the opening and extend into the accommodating space to be connected with the lock catch head; one end of the wire harness is connected with the electromagnetic connecting plate, and the other end of the wire harness is electrically connected with the control unit; wherein the electromagnetic connecting plate is connected with at least one of the vehicle seat and the spring bolt through electromagnetic force, and the electromagnetic force of the electromagnetic connecting plate is adjustably arranged. The safety belt lock catch solves the technical problem that in the prior art, a safety belt lock catch cannot provide good constraining force.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of automobile safety, in particular, relate to a safety belt electromagnetic buckle, a vehicle having the same and a control method. BACKGROUND

[0002] The traditional safety belt buckle connected by bolts is prone to wear and tear of mechanical parts, resulting in loosening of the safety belt buckle and poor body restraint during a collision.

[0003] There is currently no good solution to the above problems. SUMMARY

[0004] Embodiments of the present application provide a safety belt electromagnetic buckle, a vehicle having the same and a control method to at least solve the technical problem that the safety belt buckle cannot provide a better restraining force in the prior art.

[0005] According to an aspect of embodiments of the present application, a safety belt electromagnetic buckle is provided, comprising: a buckle head, the buckle head comprising a housing and an electromagnetic connecting plate, the housing having an open accommodating space at one end, and the electromagnetic connecting plate being connected to the side wall of the housing; a lock tongue, the lock tongue being connectable to the buckle head by extending through the opening into the accommodating space; a wire harness, one end of the wire harness being connected to the electromagnetic connecting plate, and the other end of the wire harness being electrically connected to a control unit; wherein the electromagnetic connecting plate is connected to at least one of a vehicle seat and the lock tongue by electromagnetic force, and the electromagnetic force of the electromagnetic connecting plate is adjustably set.

[0006] Further, the lock tongue has a locked state connected to the inner side of the electromagnetic connecting plate, and the lock tongue has an unlocked state separated from the inner side of the electromagnetic connecting plate; the vehicle seat has a plurality of working states connected to the electromagnetic connecting plate, and the electromagnetic force between the electromagnetic connecting plate and the vehicle seat is different in each working state.

[0007] Further, when the lock tongue is in the locked state, the electromagnetic force between the electromagnetic connecting plate and the vehicle seat is greater than the electromagnetic force between the electromagnetic connecting plate and the vehicle seat when the lock tongue is in the unlocked state.

[0008] Further, the electromagnetic connecting plate comprises: a plate body connected to the side wall of the housing; and a coil disposed on the plate body, the coil being disposed along the circumference of the plate body, the coil being a plurality of coils, the plurality of coils being disposed at a distance along the radial direction of the plate body, and the coil being connected to the wire harness.

[0009] According to another aspect of embodiments of the present application, a vehicle is also provided, the vehicle having a safety belt electromagnetic buckle, the safety belt electromagnetic buckle being the safety belt electromagnetic buckle described above.

[0010] According to another aspect of the embodiments of the present application, a control method of a safety belt electromagnetic buckle is also provided. The method is used for controlling the safety belt electromagnetic buckle. The method comprises: obtaining driving information of a target vehicle, the driving information at least comprising speed information and acceleration information of the target vehicle; generating a control instruction set based on the driving information, the control instruction set being used for controlling a current value of a coil of an electromagnetic connecting plate to adjust an electromagnetic force generated by the electromagnetic connecting plate.

[0011] Optionally, the generating of the control instruction set based on the driving information comprises: generating a first control instruction in the control instruction set in a case where the speed information meets a first preset value and the acceleration information meets a first acceleration preset condition; controlling the wire harness to input a first preset current value of current to the coil based on the first control instruction, and maintaining the first preset current value for a first preset time length, wherein the first control instruction is used for controlling the coil to quickly establish a magnetic field.

[0012] Optionally, the generating of the control instruction set based on the driving information comprises: generating a second control instruction in the control instruction set in a case where the speed information meets a second preset value and the acceleration information meets a second acceleration preset condition; controlling the wire harness to input a second preset current value of current to the coil based on the second control instruction, and maintaining the second preset current value for a second preset time length, wherein the second control instruction is used for controlling the coil to maintain a magnetic field with a stable intensity.

[0013] Optionally, the generating of the control instruction set based on the driving information comprises: generating a third control instruction in the control instruction set in a case where the speed information meets the second preset value and the acceleration information meets a third acceleration preset condition; controlling the wire harness to input a third preset current value of current to the coil based on the third control instruction, and maintaining the third preset current value for a third preset time length, wherein the third control instruction is used for controlling the coil to eliminate the magnetic field.

[0014] Optionally, the obtaining of the driving information of the target vehicle comprises: obtaining working condition information of a safety system, the working condition information of the safety system comprising airbag working condition information and anti-lock braking system working condition information; and generating a fourth control instruction in the control instruction set in a case where the acceleration information in the driving information meets a fourth acceleration preset condition and / or at least one of the airbag working condition information and the anti-lock braking system working condition information in the working condition information of the safety system is in a triggered state, wherein the fourth control instruction is used for controlling the coil to generate a maximum magnetic force.

[0015] In the embodiment of the present application, the lock head is connected with the lock tongue or the vehicle seat through the electromagnetic force of the electromagnetic connecting plate, and the electromagnetic connecting plate is connected with the control unit of the vehicle through the wire harness, so that the electromagnetic connecting plate can be controlled by the control unit according to different vehicle working conditions through the current, and then the locking force of the lock head and the lock tongue or the vehicle seat can be intelligently adjusted to provide more personalized protection. At the same time, the electromagnetic force is used to replace the mechanical non-adjustable locking mode of the traditional lock to lock the seat belt buckle, which can greatly improve the installation strength of the lock, better protect the seat belt wearer and reduce the harm, and can avoid using metal connecting parts such as screws to reduce the weight of the vehicle body. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Fig. 1 is a structural schematic diagram of an optional seat belt electromagnetic buckle according to an embodiment of the present application;

[0018] Fig. 2 is a structural schematic diagram of an optional seat belt electromagnetic buckle according to an embodiment of the present application;

[0019] Fig. 3 is a structural schematic diagram of an optional seat belt electromagnetic buckle according to an embodiment of the present application.

[0020] Among them, the above drawings include the following reference signs:

[0021] 10, lock head; 11, shell; 12, electromagnetic connecting plate; 121, plate body; 122, coil;

[0022] 20, wire harness;

[0023] 30, vehicle seat. DETAILED DESCRIPTION

[0024] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to such a process, method, product, or device.

[0026] According to the embodiments of the present application, a safety belt electromagnetic buckle is provided.

[0027] Specifically, as shown in Figs. 1 to 3 the safety belt electromagnetic buckle includes a buckle head 10, a lock tongue, and a wire harness 20, the buckle head 10 includes a shell 11 having an open accommodating space at one end and an electromagnetic connecting plate 12 connected with the side wall of the shell 11; the lock tongue can extend through the opening into the accommodating space and be connected with the buckle head 10; one end of the wire harness 20 is connected with the electromagnetic connecting plate 12, and the other end of the wire harness 20 is electrically connected with a control unit; wherein the electromagnetic connecting plate 12 is connected with at least one of the vehicle seat 30 and the lock tongue through electromagnetic force, and the electromagnetic force of the electromagnetic connecting plate 12 is adjustably arranged.

[0028] By applying the technical solutions of the present embodiment, the buckle head 10 is connected with the lock tongue or the vehicle seat 30 through the electromagnetic force of the electromagnetic connecting plate 12, and the electromagnetic connecting plate 12 can be connected with the control unit of the vehicle through the wire harness 20, so that the electromagnetic connecting plate 12 can be adjusted by the control unit according to different vehicle working conditions through the current, and then the locking force of the buckle head 10 and the lock tongue or the vehicle seat 30 can be intelligently adjusted to provide more personalized protection. At the same time, the electromagnetic force is used to replace the mechanical non-adjustable locking mode of the traditional buckle to lock the safety belt buckle, which can greatly improve the installation strength of the buckle, better protect the safety belt wearer and reduce the injury, and can avoid using metal connecting parts such as screws to reduce the weight of the vehicle body.

[0029] It should be noted that the locking tongue and the connection of the locking head 10 extending into the accommodation space through the opening can be connected by a traditional mechanical clamping mode, or the locking tongue can be attached to the electromagnetic connecting plate 12 inside the accommodation space, and connected by electromagnetic force. In this way, the locking degree of the safety belt can also be adjusted by adjusting the size of the electromagnetic force. The outer side of the electromagnetic connecting plate 12 is connected to the framework of the vehicle seat 30 by electromagnetic force, which can realize the stable connection of the locking head 10 and the vehicle seat 30, and the control unit can adjust the size of the electromagnetic force in real time according to the working condition of the vehicle, that is, adjust the locking force of the safety belt, and provide intelligent and personalized protection.

[0030] In an embodiment of the present application, when the vehicle is in a stopped state, the locking tongue can be attached to the outer side of the electromagnetic connecting plate 12. At this time, the electromagnetic connecting plate 12 can be fixed to the framework of the vehicle seat 30 by only providing a small electromagnetic force, and there is no need to manually remove the safety belt locking tongue. When the vehicle personnel needs to get off the vehicle, he can directly get up to unlock the safety belt, which improves the experience and convenience.

[0031] Specifically, the locking tongue has a locking state connected to the inner side of the electromagnetic connecting plate 12, and the locking tongue has an unlocking state separated from the inner side of the electromagnetic connecting plate 12; the vehicle seat 30 has a plurality of working states connected to the electromagnetic connecting plate 12, and the electromagnetic force between the electromagnetic connecting plate 12 and the vehicle seat 30 is different in each working state. When the vehicle is normally driven or driven at low speed, the locking tongue is in the locking state, and at this time the electromagnetic connecting plate 12 generates a moderate electromagnetic force to ensure the stability and safety of the safety belt wearer, and will not cause excessive restraint; when the vehicle is in a stopped state or other working conditions, the control unit can adjust the current passing through the coil to adjust the electromagnetic force, so that the locking tongue is in the unlocking state, and the vehicle personnel can easily get up and get rid of the safety belt. At the same time, the electromagnetic connecting plate 12 and the vehicle seat 30 have a plurality of working states, and the size of the electromagnetic force is different in each state to adapt to different vehicle operating environments. The range of electromagnetic force covers from zero power consumption standby state, to suction starting stage, to steady state working stage, and finally to release demagnetization stage. The electromagnetic force between the vehicle seat 30 and the electromagnetic connecting plate 12 can be automatically adjusted according to the driving state of the vehicle to achieve the best safety protection effect.

[0032] Further, when the locking tongue is in the locking state, the electromagnetic force between the electromagnetic connecting plate 12 and the vehicle seat 30 is greater than the electromagnetic force between the electromagnetic connecting plate 12 and the vehicle seat 30 when the locking tongue is in the unlocking state. When the locking tongue is in the locking state, the electromagnetic force between the electromagnetic connecting plate 12 and the vehicle seat 30 is set to a high threshold value to ensure that the seat belt can firmly restrain the passenger under normal driving and low-speed driving conditions, providing the necessary safety protection. When the locking tongue needs to enter the unlocking state, for example, in an emergency or after the vehicle stops, the electromagnetic force between the electromagnetic connecting plate 12 and the vehicle seat 30 will quickly decrease to a minimum value, so that the locking tongue and the electromagnetic connecting plate 12 can quickly separate, facilitating the passenger to quickly escape in an emergency or easily unlock the seat belt in a non-emergency situation, improving escape efficiency and use comfort.

[0033] Further, as shown in Fig. 3 The electromagnetic connecting plate 12 includes a plate body 121 connected to the side wall of the shell 11 and a coil 122 disposed on the plate body 121. The coil 122 is arranged along the circumference of the plate body 121, and there are multiple coils 122 arranged at a distance along the radial direction of the plate body 121. The coil 122 is connected to the wire harness 20. The wire harness 20 inputs current to the coil 122 to generate a magnetic field. By arranging multiple annular coils 122 on the plate body 121, the multiple coils 122 are independent of each other and arranged at intervals along the radial direction of the plate body 121, which can ensure that the generated magnetic field covers the entire plate surface, improving the uniformity and strength of electromagnetic adsorption. The coil 122 is connected to the control unit through the wire harness 20. The control unit can control the intensity of the current input to the coil 122 according to different working conditions of the vehicle, and thus can control the intensity of the magnetic field generated on the electromagnetic connecting plate 12. This improves the response speed and reliability of the seat belt buckle, and also reduces the wear and failure rate that may be caused by traditional mechanical connection.

[0034] According to another specific embodiment of the present application, a vehicle is provided, and the vehicle has a seat belt electromagnetic buckle. The seat belt electromagnetic buckle is the seat belt electromagnetic buckle in the above-mentioned embodiments. By integrating the seat belt electromagnetic buckle into the vehicle, the safety of the vehicle is improved. The seat belt electromagnetic buckle can automatically adjust the locking degree according to the driving state of the vehicle, providing more intelligent and personalized protection, thereby improving the safety of the vehicle.

[0035] According to another specific embodiment of the present application, a control method of a seat belt electromagnetic buckle is also provided. The method is used to control the seat belt electromagnetic buckle in the above-mentioned embodiments. The method includes the following steps:

[0036] In step S10, driving information of a target vehicle is obtained. The driving information at least includes speed information and acceleration information of the target vehicle.

[0037] Specifically, the speed information of the target vehicle is used to represent the current driving state of the vehicle, i.e., whether the vehicle is in a stop state or a running state, and the acceleration information is used to represent the current force state of the vehicle.

[0038] It should be noted that the driving information can further include angular velocity information and vehicle attitude information of the target vehicle. The engine speed, temperature, and throttle pedal opening of the vehicle are monitored and collected in real time by a sensor assembly, and the collected information is transmitted to the control unit (ECU) of the vehicle in a wired or wireless manner, so as to facilitate data analysis and decision-making of the ECU.

[0039] In step S20, a control instruction set is generated based on the driving information, and the control instruction set is used to control the size of the current value of the coil of the electromagnetic connecting plate to adjust the electromagnetic force generated by the electromagnetic connecting plate.

[0040] Specifically, after analyzing the data information, the ECU generates a control instruction set according to the algorithm stored in advance, and the control instruction set contains specific instructions for adjusting the current of the coil of the electromagnetic connecting plate, so as to ensure that the electromagnetic force can be dynamically adjusted according to the driving state of the vehicle, thereby ensuring that the electromagnetic lock system can quickly respond and provide immediate protection when facing different driving scenarios.

[0041] Through the above steps, the driving information of the target vehicle is obtained, and the driving information at least includes the speed information and the acceleration information of the target vehicle. Based on the driving information, a control instruction set is generated, and the control instruction set is used to control the size of the current value of the coil of the electromagnetic connecting plate to adjust the electromagnetic force generated by the electromagnetic connecting plate. By obtaining the driving information of the target vehicle, the size of the current value of the electromagnetic connecting plate is controlled, so as to adjust the electromagnetic force generated by the electromagnetic connecting plate. The size of the electromagnetic force depends on the current intensity through the coil. By controlling the current intensity, the adjustment of the electromagnetic force can be realized, thereby improving the adaptability and safety of the safety belt electromagnetic lock. According to the driving state of the vehicle, the locking degree is automatically adjusted to provide more intelligent and personalized protection, and the loosening risk of the safety belt lock during the collision process is reduced.

[0042] Optionally, in step S10, based on the driving information, a control instruction set is generated, and the control instruction set is used to control the size of the current value of the coil of the electromagnetic connecting plate, including:

[0043] In step S11, when it is determined that the speed information meets the first preset value and the acceleration information meets the first acceleration preset condition, a first control instruction in the control instruction set is generated.

[0044] Specifically, the first preset value and the first acceleration preset condition are pre-set condition thresholds. When the speed information meets the first preset value and the acceleration information meets the first acceleration preset condition, it indicates that the vehicle meets the first operating condition. At this time, the control unit will generate a first control command based on the first operating condition of the target vehicle. The first control command corresponds to the current value of an input coil to generate an electromagnetic force corresponding to the current operating condition.

[0045] Step S12: Based on the first control command, the control harness inputs a first preset current value to the coil and continues for a first preset duration, wherein the first control command is used to control the coil to quickly establish a magnetic field.

[0046] Specifically, the first preset current value and the first preset duration are both predetermined values. When the speed and acceleration of the target vehicle simultaneously meet the first working condition, that is, the starting stage of the target vehicle, it is necessary to control the generation of a strong current to quickly establish a stable magnetic field so that the seat belt can provide stable restraint to the human body and provide additional protection.

[0047] In one embodiment of this application, the first preset value is zero. When the speed of the target vehicle increases from zero (greater than zero) and the acceleration of the target vehicle is also greater than zero, it indicates that the vehicle has just started and a magnetic field needs to be established quickly. At this time, a first control command is generated to pass a large current of 3±0.5A into the coil in order to establish a magnetic field quickly.

[0048] Through steps S11-S12, by inputting a first preset value of current and continuing for a first preset duration, the electromagnetic connection plate can quickly generate a strong magnetic force to lock the seat belt, improving passenger safety during emergency braking or collision. Through the intelligent control of the ECU, precise adjustment of the electromagnetic force is achieved, especially in emergency situations, enabling rapid response and providing necessary safety protection, ensuring the efficiency of magnetic field establishment, and avoiding unnecessary energy waste.

[0049] Optionally, in step S10, a control command set is generated based on driving information, and the current value of the coil input to the electromagnetic connection plate is determined based on the control command set. The method further includes:

[0050] Step S13: If the speed information in the driving information meets the second preset value and the acceleration information meets the second acceleration preset condition, generate the second control command in the control command set.

[0051] Specifically, the second preset value and the second acceleration preset condition are both preset threshold conditions. When the speed information meets the second preset value and the acceleration information meets the second acceleration preset condition, it indicates that the vehicle meets the second operating condition. At this time, the control unit will generate a second control command based on the second operating condition of the target vehicle.

[0052] Step S14, based on the second control instruction, the wire harness controls the coil to input a second preset current value of current and lasts for a second preset time length, wherein the second control instruction is used to control the coil to maintain a stable strength of magnetic field.

[0053] Specifically, when the target vehicle needs to maintain a stable driving state, the ECU needs to output a stable current value to ensure a stable magnetic force, which can ensure the reliability of the seat belt buckle and will not consume excessive energy.

[0054] In an embodiment of the present application, when the vehicle is in a uniform speed state, i.e. in a steady state working phase, the ECU can intelligently adjust the power supply mode of the coil by using a PWM control strategy, thereby reducing energy consumption while maintaining the stable strength of the magnetic field.

[0055] Optionally, in step S10, based on the driving information, a control instruction set is generated, and based on the control instruction set, the current value of the coil of the electromagnetic connecting plate is determined, and the method further comprises:

[0056] Step S15, in a case where the speed information in the driving information meets a second preset value and the acceleration information meets a third acceleration preset condition, a third control instruction in the control instruction set is generated;

[0057] Step S16, based on the third control instruction, the wire harness controls the coil to input a third preset current value of current and lasts for a third preset time length, wherein the third control instruction is used to control the coil to eliminate the magnetic field.

[0058] Specifically, by inputting the third preset value of reverse current, the electromagnetic connecting plate can quickly eliminate the previously generated magnetic field, realize automatic unlocking of the buckle or enter standby state, and after the buckle is completely unlocked, the system will enter zero power consumption mode, which means that there is no current on the coil, which saves electric energy and ensures the long service life and reliability of the system.

[0059] It should be noted that the process of current magnetic elimination can be assisted by RC circuit to ensure effective energy recovery, avoid electromagnetic interference and safety hazards, ensure rapid elimination of the magnetic field, enable the buckle to quickly respond to the unlocking operation, eliminate magnetic field residues, avoid unnecessary adsorption of the buckle, and improve the response speed and safety of the system.

[0060] Optionally, in steps S10-S20, the driving information of the target vehicle is obtained, the driving information at least includes speed information and acceleration information of the target vehicle, based on the driving information, a control instruction set is generated, and the method further comprises:

[0061] Step S17, obtaining working condition information of the safety system, the working condition information of the safety system includes airbag working condition information and anti-lock braking system working condition information;

[0062] Specifically, the electromagnetic seat belt buckle system can be deeply integrated with other safety subsystems in the vehicle, including but not limited to the airbag system and the anti-lock braking system (ABS), through a communication interface between the wire harness and the ECU, ensuring information sharing between the systems.

[0063] In this embodiment, by synchronously monitoring and collecting the working condition information from the airbag system and the ABS, including the inflation state, triggering time and inflation pressure of the airbag, and the working condition information of the ABS including the data of the wheel speed sensor, brake pressure, brake response time, etc., the ECU intelligently analyzes and controls the electromagnetic buckle system.

[0064] Step S18, in a case where the acceleration information in the driving information meets the fourth acceleration preset condition, and / or, at least one of the airbag working condition information and the anti-lock braking system working condition information in the working condition information of the safety system is in a triggered state, a fourth control instruction in the control instruction set is generated, wherein the fourth control instruction is used to control the coil to generate a maximum magnetic force.

[0065] Specifically, the fourth control instruction corresponds to a high-risk working condition of the vehicle, such as a collision or an emergency braking, in which case the target vehicle is subjected to a force meeting the fourth acceleration preset condition, or the safety airbag has been ejected and the ABS system has been started, and the ECU generates the fourth control instruction, at which time the coil current of the electromagnetic buckle is quickly adjusted to the current value corresponding to the maximum magnetic force. This adjustment ensures that the seat belt buckle can provide the strongest restraint force in an emergency, thereby maximizing the protection of the passengers.

[0066] In one exemplary embodiment of the present application, in a case where the acceleration information meets the fourth acceleration preset condition, and / or, at least one of the airbag working condition information and the anti-lock braking system working condition information in the working condition information of the safety system is in a triggered state, and at the same time the power working condition information of the vehicle is in a power-off state, an unlocking control instruction is generated, which is used to control the input of the current in the coil to the door of the target vehicle to unlock the door, thereby providing valuable time for the passengers to safely evacuate or for the rescue personnel to enter the vehicle. The emergency unlocking mechanism based on the unlocking control instruction can automatically identify and respond to emergency situations without the need for manual unlocking by the passengers, thereby improving the efficiency and safety of escape in emergency situations. The unlocking of the electromagnetic buckle does not require any physical contact and is completely controlled by the current, which not only improves the unlocking speed but also avoids the problem that the traditional mechanical lock may not be able to be unlocked due to damage.

[0067] The application also provides a preferred embodiment of a seat belt electromagnetic buckle and a control method thereof. The electromagnetic buckle is connected with an electronic system of a vehicle through a wire harness, and the current passing through the electromagnetic buckle is controlled by an ECU. The locking degree is automatically adjusted according to the driving state of the vehicle (such as sudden braking, collision, etc.), thereby providing more intelligent and personalized protection.

[0068] Specifically, when the vehicle is in a stopped state, the seat belt electromagnetic buckle is in a standby state, in which case it is in a zero power consumption mode and no power is consumed. When a trigger signal input switches to an attraction starting stage, a magnetic field needs to be quickly established, the peak current IP=3A±0.5A, and the duration is 15-30 ms, at which time the power consumption is ≥80% of the rated magnetic force threshold. When the vehicle is in a steady state working stage, the attraction state needs to be maintained, Ih=IP / 3=1A±0.2A, at which time the PWM voltage regulation energy-saving regulation duty cycle is 30%-50%. When the vehicle stops, the release demagnetization stage uses an RC circuit to absorb the participating energy, at which time Ir=-1.5A±0.3A, and the duration is 5-10 ms.

[0069] The attraction starting stage adopts a double threshold comparison method. When ΔI / Δt≥0.5A / ms and Vcoil∈[24V to 36V], it is determined that the starting is effective. When the above conditions are not met, the system has an abnormal failure, and the ECU can issue an alarm to remind the user.

[0070] The PWM control strategy adopts a segmented PWM control with a frequency of 20 kHz, and the duty cycle adaptive algorithm is as follows:

[0071] D(n)=D(n-1)+Kp*[e(n)-e(n-1)]+Ki*Tse(n);

[0072] Wherein, D(n) is the duty cycle of the PWM signal at the nth iteration, Kp is the proportional gain coefficient, Ki is the integral gain coefficient, e(n) is the signal error at the nth iteration, and Ts=50μs is the sampling period.

[0073] Through PWM control and adaptive adjustment of the duty cycle, fine control of the magnetic field strength of the electromagnetic buckle can be achieved, ensuring the best protection effect under various driving conditions. The duty cycle adaptive algorithm enables the electromagnetic buckle system to intelligently adjust the output according to the actual working conditions, realizes dynamic and stable electromagnetic force control, and improves the reliability and practicality of the system.

[0074] The seat belt electromagnetic buckle also has a protection mechanism. When the coil current reaches Imax=4A, the repeated action interval is >200ms, and the power is cut off to prevent the coil from overheating. When the temperature is >85℃, the system can automatically operate at a reduced frequency.

[0075] From the above description, it can be seen that the seat belt electromagnetic lock and its control method in the above embodiment have the following beneficial effects:

[0076] 1) The ECU controls the power supply current size, which can be automatically adjusted according to different forms of vehicle driving states, such as low speed, sudden braking, collision, etc.

[0077] 2) In the event of an accident or emergency (such as vehicle power failure or airbag triggering), the electromagnetic lock can automatically unlock the vehicle door, facilitating passenger escape or rescue.

[0078] 3) The electromagnetic lock relies on magnetic force for fixation, without the frequent friction of traditional mechanical structures, reducing component wear and tear and prolonging service life.

[0079] 4) Better sealing, less susceptible to dust, rain or extreme temperatures.

[0080] For ease of description, spatial relative terms such as "above", "upper", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0081] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in the specification refer to specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described in the general description of the application. The same expression appears in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present application.

[0082] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0083] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A seatbelt electromagnetic buckle, characterized in that, include: The latch head (10) includes a housing (11) and an electromagnetic connecting plate (12). The housing (11) has an accommodating space with an opening at one end, and the electromagnetic connecting plate (12) is connected to the side wall of the housing (11). A latch, which can extend through the opening into the receiving space and connect with the latch head (10); A wire harness (20), one end of which is connected to the electromagnetic connection plate (12), and the other end of which is electrically connected to the control unit; The electromagnetic connecting plate (12) is connected to at least one of the vehicle seat (30) and the locking tongue by electromagnetic force, and the electromagnetic force of the electromagnetic connecting plate (12) is adjustable.

2. The seatbelt electromagnetic buckle according to claim 1, characterized in that, The latch has a locked state connected to the inner side of the electromagnetic connecting plate (12), and the latch has an unlocked state separated from the inner side of the electromagnetic connecting plate (12). The vehicle seat (30) has multiple working states connected to the electromagnetic connecting plate (12), and the electromagnetic force between the electromagnetic connecting plate (12) and the vehicle seat (30) is different in each working state.

3. The seatbelt electromagnetic buckle according to claim 2, characterized in that, When the latch is in the locked state, the electromagnetic force between the electromagnetic connecting plate (12) and the vehicle seat (30) is greater than the electromagnetic force between the electromagnetic connecting plate (12) and the vehicle seat (30) when the latch is in the unlocked state.

4. The seatbelt electromagnetic buckle according to any one of claims 1 to 3, characterized in that, The electromagnetic connection plate (12) includes: Plate (121), the plate (121) being connected to the side wall of the outer shell (11); A coil (122) is disposed on the plate (121). The coil (122) is disposed along the circumference of the plate (121). There are multiple coils (122). The multiple coils (122) are disposed at a distance along the radial direction of the plate (121). The coils (122) are connected to the wire harness (20).

5. A vehicle, characterized in that, The vehicle has a seatbelt electromagnetic buckle, which is the seatbelt electromagnetic buckle according to any one of claims 1-4.

6. A control method for an electromagnetic seatbelt buckle, characterized in that, The method is used to control the seat belt electromagnetic buckle according to any one of claims 1-4, and the method includes: Acquire the driving information of the target vehicle, wherein the driving information includes at least the speed information and acceleration information of the target vehicle; Based on the driving information, a control command set is generated. The control command set is used to control the current value of the coil of the electromagnetic connection plate in order to adjust the electromagnetic force generated by the electromagnetic connection plate.

7. The method according to claim 6, characterized in that, Based on the driving information, a control command set is generated. This control command set is used to control the current value of the coil in the electromagnetic connection plate, including: If the speed information satisfies a first preset value and the acceleration information satisfies a first preset acceleration condition, a first control instruction is generated in the control instruction set. Based on the first control command, the control harness inputs a current of a first preset current value to the coil and continues for a first preset duration, wherein the first control command is used to control the coil to quickly establish a magnetic field.

8. The method according to claim 7, characterized in that, Based on the driving information, a control command set is generated; based on the control command set, the current value of the coil input to the electromagnetic connection plate is determined; the method further includes: If the speed information in the driving information meets a second preset value and the acceleration information meets a second preset acceleration condition, a second control command is generated in the control command set. Based on the second control command, the wiring harness is controlled to input a current of a second preset current value to the coil for a second preset duration, wherein the second control command is used to control the coil to maintain a magnetic field of stable strength.

9. The method according to claim 8, characterized in that, Based on the driving information, a control command set is generated; based on the control command set, the current value of the coil input to the electromagnetic connection plate is determined; the method further includes: If the speed information in the driving information satisfies the second preset value and the acceleration information satisfies the third acceleration preset condition, a third control command is generated in the control command set. Based on the third control command, the wiring harness is controlled to input a current of a third preset current value to the coil for a third preset duration, wherein the third control command is used to control the coil to eliminate the magnetic field.

10. The method according to any one of claims 6-9, characterized in that, The method further includes: acquiring driving information of a target vehicle, wherein the driving information includes at least the target vehicle's speed and acceleration information; generating a control command set based on the driving information; and acquiring driving information of a target vehicle. Acquire operating condition information of the safety system, including airbag operating condition information and anti-lock braking system operating condition information; When it is determined that the acceleration information in the driving information meets the fourth acceleration preset condition, and / or when at least one of the airbag operating information and the anti-lock braking system operating information in the safety system operating information is in a triggered state, a fourth control instruction in the control instruction set is generated, wherein the fourth control instruction is used to control the coil to generate the maximum electromagnetic force.

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