An airbag ignition circuit, an airbag ignition control method, and a vehicle terminal device

Abstract

The application relates to the technical field of vehicle safety control, in particular to an airbag ignition circuit, an airbag ignition control method and a vehicle terminal device. The circuit comprises an ignition execution module, an ignition load module, a cross-redundancy channel module and a main control module. The ignition execution module comprises a plurality of independent ignition channel units and is used for connecting and driving airbag ignition loads; the ignition load module comprises a plurality of airbag ignition loads; the cross-redundancy channel module comprises a plurality of controllable switch units; the control ends of the controllable switch units are coupled with the main control module, and the main control module is also connected with the ignition execution module and used for acquiring channel states of the ignition channel units and sending ignition instructions; and the main control module is also used for controlling the switching between the ignition channel units by scheduling the switch states of the controllable switch units. The circuit can reduce the single-point failure risk of airbag ignition, improve the stability of airbag ignition and improve the utilization rate of redundant hardware resources.

Description

Technical Field

[0001] This application relates to the field of vehicle safety control technology, and in particular to an airbag ignition circuit, an airbag ignition control method, and a vehicle terminal device. Background Technology

[0002] Vehicle safety control technology is one of the core technologies in modern automotive engineering. Its fundamental purpose is to protect the lives of occupants, mitigate personal injury, and minimize vehicle property damage to the greatest extent possible in the event of a collision or potentially hazardous situation, through a series of active or passive intervention measures. This technology is crucial for improving road traffic safety, meeting increasingly stringent regulatory requirements, and enhancing the market competitiveness of automotive products. With the rapid development of automotive intelligence and electrification, vehicle safety control technology has evolved from early, simple mechanical protection to a complex mechatronic system integrating sensor networks, high-speed electronic control units (ECUs), and multiple actuators.

[0003] In vehicle passive safety systems, airbag systems (including front airbags, side airbags, curtain airbags, etc.) are crucial for protecting occupants. Their core working principle is: within a very short time after a collision (usually within tens of milliseconds), an igniter triggers the rapid inflation and deployment of the airbags. This creates a soft buffer zone before the occupant makes violent contact with the vehicle's rigid structures (such as the steering wheel, dashboard, and side windows), effectively absorbing collision energy, slowing the occupant's deceleration, and preventing or mitigating serious injuries to critical areas such as the head and chest. Whether the airbags deploy at the correct time and in the correct manner directly determines their protective effectiveness. Improper deployment (such as deploying unnecessarily, failing to deploy when required, or deploying too late) not only fails to provide protection but may also cause additional secondary injuries to the occupant due to the airbag's own explosive force, or lead to unnecessary repair costs. Therefore, the "brain" of the airbag system—the airbag collision decision technology—becomes the decisive factor in the overall system's effectiveness and reliability.

[0004] In related technologies, airbag ignition circuits need to achieve fast and highly reliable triggering control upon collision. Existing designs use a single-loop driven ignition resistor (Squib) to directly trigger the airbag. However, this architecture lacks redundancy protection mechanisms and is prone to single-point failure—if the main circuit experiences an open circuit, short circuit, or drive component failure, it will directly lead to ignition failure, seriously threatening occupant safety. Currently, redundancy designs are typically used to improve the fault tolerance of ignition control, such as redundant acquisition of collision data, multi-sensor cross-verification of ignition timing, parallel control of MOSFET switches, and redundancy and fault tolerance of bus communication.

[0005] However, current airbag ignition circuits have the following technical problems:

[0006] Current redundancy designs focus on software design dimensions, while the ignition circuit itself has gaps that need to be optimized. Summary of the Invention

[0007] Therefore, it is necessary to provide an airbag ignition circuit, airbag ignition control method, and vehicle terminal equipment that can reduce the risk of single-point failure of airbag ignition, improve the stability of airbag ignition, and improve the utilization rate of redundant hardware resources.

[0008] This application provides an airbag ignition circuit, the circuit comprising:

[0009] The ignition execution module includes several independent ignition channel units. The output terminals of each ignition channel unit are provided with high-side drive pins and low-side drive pins. The ignition execution module is used to connect to and drive the airbag ignition load.

[0010] The ignition load module includes a plurality of airbag ignition loads, one end of which is coupled to the high-side drive pin of the corresponding ignition channel unit, and the other end is coupled to the low-side drive pin of the corresponding ignition channel unit.

[0011] The cross-redundant channel module includes several controllable switching units. The input terminal of each controllable switching unit is coupled to the high-side drive pin or low-side drive pin of a backup ignition channel unit, and the output terminal is coupled to the drive pin of an airbag ignition load that is not corresponding to the backup ignition channel unit.

[0012] The main control module is coupled to the control terminal of the controllable switch unit. The main control module is also connected to the ignition execution module and is used to obtain the channel status of the ignition channel unit in the ignition execution module and send ignition commands. The main control module is also used to control the switching between the ignition channel units by scheduling the switching status of the controllable switch unit.

[0013] In one embodiment, the main control module is further configured to detect the status of the ignition channel unit based on a preset period and acquire the status data of the ignition channel unit.

[0014] In one embodiment, the cross-redundant channel module includes:

[0015] The buffer and level conversion unit, wherein the controllable switching unit includes a switching transistor, is located between the gate of the switching transistor and the main control module, and is used to boost and filter the level driving signal output by the main control module to drive the switching transistor.

[0016] In one embodiment, the main control module has a preset main channel state pool and a backup channel state pool. The main control module is configured to respond to any main channel failure by selecting an available channel from the backup channel pool based on the backup channel state pool, and controlling the controllable switch unit connecting the failed main channel and the target backup channel to be turned on, so as to reconstruct the ignition path.

[0017] In one embodiment, the ignition execution module is further configured to count airbag ignition events, and the main control module is further configured to verify the execution result of the ignition command based on the counting signal of the ignition execution module.

[0018] In one embodiment, the cross-redundant channel module is constructed using a hierarchical switch array architecture and / or a matrix switch network, such that the high-side drive pin and the low-side drive pin of at least one backup channel are respectively connected to multiple different airbag ignition loads through multiple controllable switch units to achieve redundancy backup.

[0019] In one embodiment, there are multiple ignition execution modules, which constitute a distributed redundant network; the backup channels of the multiple ignition execution modules are connected to the cross-redundant channel module through optical couplers and are uniformly scheduled by the main control module.

[0020] In one embodiment, the main control module is further configured to read the diagnostic status of the ignition execution module after the vehicle system is powered on, initialize the main channel state pool and the backup channel state pool, and enter the periodic diagnostic process.

[0021] Secondly, this application also provides an airbag ignition control method, the method being implemented based on an airbag ignition circuit as described in any one of the first aspects, comprising the following steps:

[0022] In response to a collision sensor signal trigger, it receives a collision signal and determines the main channel status corresponding to the target airbag based on periodic diagnostic results.

[0023] If the main channel is in normal condition, an ignition command is sent to the target main channel. If the main channel is in abnormal condition, the target backup channel is determined based on the backup channel status pool, and a scheduling signal is generated.

[0024] Based on the scheduling signal conduction cross-redundancy circuit, the target switch unit connects the target backup channel and the target airbag;

[0025] The ignition command is sent to the target backup channel, and the ignition event count signal is obtained to confirm the execution result of the ignition command until the target airbag is successfully ignited.

[0026] Thirdly, this application also provides a vehicle terminal device, including an airbag ignition circuit according to any one of the first aspects, the airbag ignition circuit being implemented based on an airbag ignition control method as described in the second aspect.

[0027] The aforementioned airbag ignition circuit, airbag ignition control method, and vehicle terminal equipment, derived from the technical features in the embodiments, can achieve the following beneficial effects to address the technical problems raised in the background art:

[0028] This application provides an airbag ignition circuit, including an ignition execution module, an ignition load module, a cross-redundant channel module, and a main control module. In implementation, a cross-redundant channel module dynamically controlled by the main control module is introduced. Under normal operating conditions, each ignition channel unit independently drives its corresponding airbag ignition load. Once the main control module detects a fault (such as an open circuit or short circuit) in a primary ignition channel unit, it can immediately activate a redundancy switching mechanism: selecting a normal channel from the backup ignition channel units and controlling the corresponding controllable switch unit to conduct, dynamically "bridging" or "rerouting" the drive signal of the backup channel to the airbag ignition load corresponding to the faulty channel, thereby bypassing the fault point and forming a new, complete ignition circuit. This design, for the first time, achieves dynamic sharing of ignition channel resources and cross-airbag redundancy backup at the physical level, completely breaking the limitation of fixed binding between channels and airbags in traditional solutions. This allows the circuit to not only ensure that the system can still reliably trigger the airbag when the main channel fails at a single point, greatly improving the safety redundancy level, but also to transform the originally idle channel resources in the multi-channel ignition chip into a global backup pool that can be scheduled on demand, significantly improving the utilization rate of hardware resources and the overall economy of the system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the architecture of an airbag ignition circuit in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the connection of an airbag ignition circuit in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the connection of the cross-redundant channel module in the embodiments of this application;

[0033] Figure 4 This is a flowchart illustrating an airbag ignition control method according to an embodiment of this application.

[0034] Figure 5 This is a flowchart illustrating an airbag ignition control method in a specific embodiment.

[0035] Explanation of reference numerals in the attached diagram: 100, Ignition execution module; 200, Ignition load module; 300, Cross-redundant channel module; 400, Main control module. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0039] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0040] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0041] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0042] This application was made by the inventor based on his understanding and research into the following issues:

[0043] In related technologies, airbag ignition circuits need to achieve fast and highly reliable triggering control upon collision. Existing designs use a single-loop driven ignition resistor (Squib) to directly trigger the airbag. However, this architecture lacks redundancy protection mechanisms and is prone to single-point failure—if the main circuit experiences an open circuit, short circuit, or drive component failure, it will directly lead to ignition failure, seriously threatening occupant safety. Currently, redundancy designs are typically used to improve the fault tolerance of ignition control, such as redundant acquisition of collision data, multi-sensor cross-verification of ignition timing, parallel control of MOSFET switches, and redundancy and fault tolerance of bus communication.

[0044] However, current airbag ignition circuits have the following technical problems:

[0045] Current redundancy designs focus on software design dimensions, while the ignition circuit itself has gaps that need to be optimized.

[0046] To address the aforementioned issues, this application provides an airbag ignition circuit, an airbag ignition control method, and a vehicle terminal device.

[0047] In one embodiment, the airbag ignition circuit provided in this application can be as follows: Figure 1 and Figure 2 As shown, it includes an ignition execution module, an ignition load module, a cross-redundant channel module, and a main control module.

[0048] The ignition execution module includes several independent ignition channel units. The output terminals of each ignition channel unit are equipped with high-side drive pins and low-side drive pins. The ignition execution module is used to connect to and drive the airbag ignition load.

[0049] For example, the ignition execution module is the execution layer of the entire system. It is directly connected to the airbag ignition load (Squib) of the airbag group (including driver airbag DAB, passenger airbag PAB, side airbags, etc.) through an independent and controllable drive channel. The ignition execution module integrates real-time diagnostic circuits for each channel, which can detect faults such as open circuit, short circuit and ignition power stage function, and report them to the MCU through the SPI interface.

[0050] The ignition load module includes several airbag ignition loads. One end of each airbag ignition load is coupled to the high-side drive pin of the corresponding ignition channel unit, and the other end is coupled to the low-side drive pin of the corresponding ignition channel unit.

[0051] The cross-redundant channel module includes several controllable switch units. The input terminal of each controllable switch unit is coupled to the high-side drive pin or low-side drive pin of a backup ignition channel unit, and the output terminal is coupled to the drive pin of an airbag ignition load that is not corresponding to the backup ignition channel unit.

[0052] The controllable switching unit can be a MOSFET, IGBT, optocoupler relay, or solid-state relay.

[0053] For example, the cross-redundancy circuit takes the redundant design of the driver airbag (DAB) and passenger airbag (PAB) as an example, such as... Figure 2 and Figure 3 As shown, the main channel (CH1) of the DAB is directly connected to its ignition resistor R1 via the high side CH1_IGH1, and its low side CH1_IGL1 is connected to the other end of the ignition resistor R1, forming a complete CH1 ignition channel. The high side CH3_IGH3 of the backup channel CH3 is connected to the same ignition resistor R1 via the drain and source terminals of MOSFET Q1, and the low side CH3_IGL3 is connected to the other end of R1 via MOSFET Q2, forming a complete backup ignition path CH2. The gates of Q1 and Q2 are controlled by GPIO1 of the MCU. Similarly, the main channel CH2 of the PAB is directly connected to its ignition resistor R2 via the high side CH2_IGH2, and its low side CH2_IGL2 is connected to the other end of the ignition resistor R2, forming a complete CH2 ignition channel. The high-side ignition channel CH4_IGH4 of the backup channel CH4 is connected to the ignition resistor R2 through the DS terminal of MOSFET Q3, and the low-side ignition channel CH4_IGL4 is connected to the other end of R2 through MOSFET Q4, forming a complete backup ignition path CH4. The gates of Q3 and Q4 are controlled by GPIO2 of the MCU.

[0054] Under normal operating conditions, the gates of Q1-Q4 are at a low level (0V), the MOSFETs are off, and CH1 and CH2 independently drive DAB and PAB. When CH1 / CH2 fails, the MCU pulls GPIO1 / GPIO2 high to 10V (boosted by the level conversion chip TXS0108E), turning on Q1 / Q3 and Q2 / Q4. The current path of CH3 / CH4 is CH3_IGH3→Q1→R1→Q2→CH3_IGL3 / CH4_IGH4→Q3→R2→Q4→CH4_IGL4, bypassing the fault channel to complete ignition.

[0055] For example, to ensure reliability, automotive-grade IRF transistors can be selected, and the gate drive circuit can integrate RC filtering to suppress high-frequency oscillations; the PCB layout can adopt symmetrical traces and inner layer copper shielding to reduce timing deviations and electromagnetic interference.

[0056] The main control module is coupled to the control terminal of the controllable switch unit. The main control module is also connected to the ignition execution module and is used to obtain the channel status of the ignition channel unit in the ignition execution module and send ignition commands. The main control module is also used to control the switching between the ignition channel units by scheduling the switching status of the controllable switch unit.

[0057] By implementing the above-described airbag ignition circuit, the following beneficial effects can be achieved:

[0058] This application provides an airbag ignition circuit, including an ignition execution module, an ignition load module, a cross-redundant channel module, and a main control module. In implementation, a cross-redundant channel module dynamically controlled by the main control module is introduced. Under normal operating conditions, each ignition channel unit independently drives its corresponding airbag ignition load. Once the main control module detects a fault (such as an open circuit or short circuit) in a primary ignition channel unit, it can immediately activate a redundancy switching mechanism: selecting a normal channel from the backup ignition channel units and controlling the corresponding controllable switch unit to conduct, dynamically "bridging" or "rerouting" the drive signal of the backup channel to the airbag ignition load corresponding to the faulty channel, thereby bypassing the fault point and forming a new, complete ignition circuit. This design, for the first time, achieves dynamic sharing of ignition channel resources and cross-airbag redundancy backup at the physical level, completely breaking the limitation of fixed binding between channels and airbags in traditional solutions. This allows the circuit to not only ensure that the system can still reliably trigger the airbag when the main channel fails at a single point, greatly improving the safety redundancy level, but also to transform the originally idle channel resources in the multi-channel ignition chip into a global backup pool that can be scheduled on demand, significantly improving the utilization rate of hardware resources and the overall economy of the system.

[0059] In one embodiment, the main control module is further configured to detect the status of the ignition channel unit based on a preset period and acquire the status data of the ignition channel unit.

[0060] In this embodiment, through periodic self-diagnosis, the system can grasp the health status of each ignition channel in real time and accurately, providing a reliable basis for the redundancy switching decision of the main control module, and ensuring that faults can be detected and responded to in a timely manner from the source.

[0061] In one embodiment, the cross-redundant channel module includes:

[0062] The buffer and level conversion unit, wherein the controllable switching unit includes a switching transistor, is located between the gate of the switching transistor and the main control module, and is used to boost and filter the level driving signal output by the main control module to drive the switching transistor.

[0063] In this embodiment, by setting up a buffer and level conversion unit, the control signal can stably and reliably drive the switching transistor, avoiding malfunctions of the switch due to insufficient driving voltage or signal interference, thereby ensuring the accuracy and electrical safety of the redundant channel switching process.

[0064] In one embodiment, the main control module has a preset main channel state pool and a backup channel state pool. The main control module is configured to respond to any main channel failure by selecting an available channel from the backup channel pool based on the backup channel state pool, and controlling the controllable switch unit connecting the failed main channel and the target backup channel to be turned on, so as to reconstruct the ignition path.

[0065] In this embodiment, through a preset state pool management mechanism, the main control module can complete fault determination, backup resource retrieval and physical path switching in a short time based on real-time diagnostic information, realizing a fully automatic and rapid response from fault detection to redundancy succession, which helps to improve the system's fault tolerance and ignition reliability.

[0066] In one embodiment, the ignition execution module is further configured to count airbag ignition events, and the main control module is further configured to verify the execution result of the ignition command based on the counting signal of the ignition execution module.

[0067] In this embodiment, counting airbag ignition events provides key feedback on the ignition action execution results to the main control module, forming a closed-loop control from command issuance to action confirmation. This not only effectively verifies whether each ignition is successfully triggered, but also confirms the normal functioning of the backup channel after redundancy switching, further enhancing the system's controllability and reliability verification capabilities.

[0068] In one embodiment, such as Figure 3 As shown, the cross-redundant channel module is constructed using a hierarchical switch array architecture and / or a matrix switch network, so that the high-side drive pin and the low-side drive pin of at least one backup channel are respectively connected to multiple different airbag ignition loads through multiple controllable switch units to achieve redundancy backup.

[0069] For example, the redundant backup channel mechanism of this embodiment can give the system strong scenario adaptability. Specifically, in the low-end model (2 airbags), the remaining channels of the 8-channel chip (such as CH5~CH8) can be configured as a global backup pool, and these channels can temporarily take over the faulty path; the high-end model (6 airbags) achieves many-to-many redundancy through a hierarchical MOS array (such as CH7 connected to DAB, left airbag and knee airbag via MOS transistors); in the dual-chip solution, when the backup channels of the main chip are exhausted, the slave chip channels can be called, and the MOS transistors are controlled to connect through optocoupler isolators to form a distributed redundancy network.

[0070] In this embodiment, by setting up a network with multiple different redundant channels, redundant resource sharing in special scenarios such as one-to-many or many-to-many can be achieved as needed. This helps to further improve the utilization rate of backup channels, enhance the system's dynamic resource allocation capability, and improve the scalability of the overall architecture.

[0071] In one embodiment, there are multiple ignition execution modules, which constitute a distributed redundant network; the backup channels of the multiple ignition execution modules are connected to the cross-redundant channel module through optical couplers and are uniformly scheduled by the main control module.

[0072] In this embodiment, by introducing multiple modules and optical isolation, the system achieves a higher level of redundancy and isolation at the physical layer. The main control module can call backup resources across chips, significantly expanding the capacity and flexibility of the redundancy pool; at the same time, optical isolation effectively prevents the electrical propagation of faults between different modules, improving the reliability and security of the entire distributed system.

[0073] In one embodiment, the main control module is further configured to read the diagnostic status of the ignition execution module after the vehicle system is powered on, initialize the main channel state pool and the backup channel state pool, and enter the periodic diagnostic process.

[0074] For example, after the airbag controller is powered on, the main control module first performs a comprehensive diagnostic on the ignition execution module, checking whether each main channel is in normal mode (e.g., no open circuit, short circuit, or over-temperature fault), ensuring that the channel status in the main channel pool and backup channel pool is correct. This operation is performed periodically. If a main channel fault is detected (e.g., CH1 open circuit), the channel is stored in the channel fault pool, and the backup channel is switched, the corresponding MOSFET and backup path are turned on, and a series of diagnostics such as backup channel open circuit, short circuit, and power stage function are quickly performed. After successful diagnosis, the channel information is recorded.

[0075] When the sensor triggers the ignition signal, the main control module first reads the main channel pool. If the main channel is in normal condition, the main control module directly sends the ignition command to the corresponding channel. If a fault is detected in the corresponding channel of the main channel pool, the MCU immediately initiates the redundancy switching process: First, it selects an available channel from the preset backup channel pool and turns on the corresponding MOSFET to switch the ignition path. Second, it sends the ignition command to the backup channel and simultaneously reads the ignition event counter of the ignition execution module through the SPI interface to confirm whether the channel is igniting and whether the ignition time is normal. Third, if the backup ignition is successful, the main control module records the ignition information. If the backup channel also fails, the main control module initiates a cascaded backup mechanism (such as calling the redundant channels of other airbags) or reports a system-level fault code.

[0076] In this embodiment, automatically executed periodic diagnostics ensure that the system has a complete and accurate view of the channel status from startup, providing a reliable data foundation for subsequent redundancy decisions. Continuous periodic diagnostics dynamically track changes in channel status, keeping the state pool constantly updated and helping to guarantee the timeliness of system responses and the correctness of decisions throughout its lifecycle.

[0077] Based on the same inventive concept, this application also provides an airbag ignition control method, which can, as follows: Figure 4 and Figure 5 As shown, the method is implemented based on an airbag ignition circuit as described in any of the above embodiments, and includes the following steps:

[0078] Step 402: In response to the collision sensor signal trigger, receive the collision signal and determine the main channel status corresponding to the target airbag based on the periodic diagnostic results.

[0079] Step 404: If the main channel is in normal condition, send an ignition command to the target main channel; if the main channel is in abnormal condition, determine the target backup channel based on the backup channel status pool and generate a scheduling signal.

[0080] Step 406: Based on the scheduling signal, activate the target switch unit in the cross-redundancy circuit that connects the target backup channel and the target airbag.

[0081] Step 408: Send the ignition command to the target backup channel, obtain the ignition event count signal to confirm the execution result of the ignition command, until the target airbag is successfully ignited.

[0082] Specifically, in a collision-triggered scenario, when the accelerometer detects an impact signal exceeding a set threshold, the MCU receives collision level data via the CAN bus and initiates the ignition process: First, it reads the status of the main channel pool (used to store the status pool of the main channel corresponding to each airbag). If the main channel is normal, it directly sends the ignition command via SPI; if the main channel fails (e.g., CH1 is open), the MCU immediately initiates the redundancy switching process—selecting an available channel from the backup channel pool (used to store the status pool of the backup channel corresponding to each airbag), controlling the corresponding MOSFET to turn on, switching the ignition path, and triggering the backup channel ignition. This architecture achieves fault tolerance for multiple airbag groups within a single chip through deep coupling of hardware redundancy and software decision-making. At the same time, by utilizing the dynamic reuse of idle channels, the system overcomes the limitations of traditional solutions in terms of cost, reliability, and scalability.

[0083] Based on the same inventive concept, embodiments of this application also provide a vehicle terminal device, including an airbag ignition circuit as described in any of the above embodiments, wherein the airbag ignition circuit is implemented based on an airbag ignition control method as described in the above embodiments.

[0084] It is understood that the airbag ignition circuit, airbag ignition control method and vehicle terminal equipment described above can also take other forms, and are not limited to the forms already mentioned in the above embodiments, as long as they can improve the stability of airbag ignition control from a hardware perspective.

[0085] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An airbag ignition circuit, characterized in that, The circuit includes: The ignition execution module includes several independent ignition channel units. The output terminals of each ignition channel unit are provided with high-side drive pins and low-side drive pins. The ignition execution module is used to connect to and drive the airbag ignition load. The ignition load module includes a plurality of airbag ignition loads, one end of which is coupled to the high-side drive pin of the corresponding ignition channel unit, and the other end is coupled to the low-side drive pin of the corresponding ignition channel unit. The cross-redundant channel module includes several controllable switching units. The input terminal of each controllable switching unit is coupled to the high-side drive pin or low-side drive pin of a backup ignition channel unit, and the output terminal is coupled to the drive pin of an airbag ignition load that is not corresponding to the backup ignition channel unit. The main control module is coupled to the control terminal of the controllable switch unit. The main control module is also connected to the ignition execution module and is used to obtain the channel status of the ignition channel unit in the ignition execution module and send ignition commands. The main control module is also used to control the switching between the ignition channel units by scheduling the switching status of the controllable switch unit.

2. The airbag ignition circuit according to claim 1, characterized in that, The main control module is also configured to detect the status of the ignition channel unit based on a preset period and acquire the status data of the ignition channel unit.

3. The airbag ignition circuit according to claim 1, characterized in that, The cross-redundant channel module includes: The buffer and level conversion unit, wherein the controllable switching unit includes a switching transistor, is located between the gate of the switching transistor and the main control module, and is used to boost and filter the level driving signal output by the main control module to drive the switching transistor.

4. The airbag ignition circuit according to claim 1, characterized in that, The main control module has a main channel state pool and a backup channel state pool. The main control module is configured to respond to any main channel failure by selecting an available channel from the backup channel pool based on the backup channel state pool, and controlling the controllable switch unit connecting the failed main channel and the target backup channel to be turned on, so as to reconstruct the ignition path.

5. The airbag ignition circuit according to claim 1, characterized in that, The ignition execution module is also configured to count airbag ignition events, and the main control module is also configured to verify the execution result of the ignition command based on the counting signal of the ignition execution module.

6. An airbag ignition circuit according to any one of claims 1 to 5, characterized in that, The cross-redundant channel module is constructed using a hierarchical switch array architecture and / or a matrix switch network, so that the high-side drive pin and the low-side drive pin of at least one backup channel are respectively connected to multiple different airbag ignition loads through multiple controllable switch units to achieve redundancy backup.

7. The airbag ignition circuit according to claim 1, characterized in that, The ignition execution module is provided in multiple ways, and the multiple ignition execution modules form a distributed redundant network; the backup channels of the multiple ignition execution modules are connected to the cross-redundant channel module through optical couplers and are uniformly scheduled by the main control module.

8. An airbag ignition circuit according to claim 4, characterized in that, The main control module is also configured to read the diagnostic status of the ignition execution module after the vehicle system is powered on, initialize the main channel status pool and the backup channel status pool, and enter the periodic diagnostic process.

9. A method for controlling airbag ignition, characterized in that, The method is based on an airbag ignition circuit as described in any one of claims 1 to 8, and includes the following steps: In response to a collision sensor signal trigger, it receives a collision signal and determines the main channel status corresponding to the target airbag based on periodic diagnostic results. If the main channel is in normal condition, an ignition command is sent to the target main channel. If the main channel is in abnormal condition, the target backup channel is determined based on the backup channel status pool, and a scheduling signal is generated. Based on the scheduling signal conduction cross-redundancy circuit, the target switch unit connects the target backup channel and the target airbag; The ignition command is sent to the target backup channel, and the ignition event count signal is obtained to confirm the execution result of the ignition command until the target airbag is successfully ignited.

10. A vehicle terminal device, characterized in that, The invention includes an airbag ignition circuit according to any one of claims 1-8, wherein the airbag ignition circuit is implemented based on an airbag ignition control method according to claim 9.

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