An emergency call system, method, and vehicle

Abstract

This invention relates to the field of vehicle technology and discloses an emergency call system, method, and vehicle. The emergency call system includes a control module and a voice call module. The voice call module includes a primary call link and a backup call link. The control module is communicatively connected to both the primary and backup call links. The control module is used to switch the current call link to the backup call link when there is an emergency call requirement and the primary call link fails, so that the emergency call can be made through the backup call link. Applying the technical solution of this invention enables timely switching to the backup call link in the event of a primary call link failure, ensuring the normal use of emergency calls and improving vehicle safety.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically to an emergency call system, method, and vehicle. Background Technology

[0002] The Emergency Call System (ECALL) is a critical safety system that automatically initiates an emergency call to a Public Safety Response Point (PSAP) and simultaneously transmits vehicle location and accident information in the event of a serious collision or emergency. This system has become a mandatory in-vehicle safety feature in major global markets, playing a significant role in improving the efficiency of post-accident rescue response and enhancing occupant safety.

[0003] However, existing ECALL systems generally reuse the microphone and speaker modules of the vehicle's main unit (i.e., the in-vehicle infotainment system), creating a strong dependence on the on-vehicle hardware. If an accident causes hardware damage, power outage, or malfunction of the in-vehicle infotainment system, the emergency voice communication link will be directly interrupted, making it impossible to complete rescue requests and effective information exchange with the rescue center. This severely restricts rescue efficiency in emergency situations and poses a potential threat to the lives of occupants. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide an emergency call system, method and vehicle, which aims to solve the technical problem of insufficient vehicle safety in the prior art.

[0005] In a first aspect, embodiments of this application provide an emergency call system, including: a control module and a voice call module; the voice call module includes: a primary call link and a backup call link; the control module is communicatively connected to the primary call link and the backup call link respectively; wherein, the control module is used to switch the current call link to the backup call link when there is an emergency call demand and the primary call link fails, so as to make an emergency call through the backup call link.

[0006] Based on the aforementioned technical methods, by setting a primary call link as the default call path and a backup call link as a redundant backup path, the emergency call system achieves a dual-redundancy design for the call links. When the primary call link fails, the control module can automatically switch to the backup call link, ensuring uninterrupted voice communication during emergency calls, thereby significantly improving the reliability and safety of vehicle emergency communication. In an exemplary embodiment, the emergency call system further includes a positioning module; the positioning module includes a primary positioning link and a backup positioning link; a control module is communicatively connected to the primary positioning link and the backup positioning link respectively; the control module is also used to determine whether the primary positioning link meets preset positioning conditions during the emergency call process; if the primary positioning link meets the preset positioning conditions, the current positioning link is switched from the primary positioning link to the backup positioning link to determine the positioning location through the backup positioning link and send the positioning location; wherein, when the primary positioning link meets the preset positioning conditions, the positioning accuracy is less than the preset accuracy.

[0007] Based on the aforementioned technical means, by setting the primary positioning link as the default positioning link and the backup positioning link as a redundant positioning link, the emergency call system achieves a dual-redundancy design for the positioning module. This allows the system to automatically switch to the backup positioning link when the positioning accuracy of the primary positioning link is insufficient. The backup positioning link independently completes the positioning calculation and outputs the location information, ensuring that the emergency call system can always report the accurate accident location. This guarantees that rescue forces can quickly arrive at the scene, significantly improving the positioning reliability and rescue success rate of vehicles in extreme scenarios.

[0008] In an exemplary embodiment, the control module includes: a voice link detection unit and a first switching unit; the voice link detection unit and the first switching unit are communicatively connected; the voice link detection unit is used to perform communication detection on the primary call link and send the communication detection result to the first switching unit; the first switching unit is used to determine whether the primary call link meets the call link failure determination condition based on the communication detection result; if the primary call link meets the call link failure determination condition, the primary call link is determined to be faulty, and the current call link is switched from the primary call link to the backup call link.

[0009] Based on the aforementioned technical means, the voice link detection unit continuously verifies the functionality of the primary call link's audio acquisition, audio playback, bus communication, and network registration status, and sends the detection results to the first switching unit. Upon receiving the detection results, the first switching unit compares them with preset call link fault determination conditions (such as missing audio, no call response, abnormal audio amplitude, etc.). Once a match is found, the primary call link fault is confirmed, and the unit autonomously performs a switching operation from the primary call link to the backup call link.

[0010] In an exemplary embodiment, the call link failure determination conditions include at least one of the following: the main call link has audio missing, the main call link does not receive a response after an emergency call is made, or the audio amplitude of the main call link is not within the standard audio amplitude range.

[0011] Based on the aforementioned technical methods, the audio loss condition covers scenarios where the microphone or speaker completely fails (e.g., device damage, power outage); the no-response condition covers scenarios where the network or PSAP side cannot establish a connection (e.g., communication module disconnected from the network, abnormal call signaling); and the abnormal audio amplitude condition covers scenarios where the audio signal quality deteriorates but is not completely lost (e.g., device performance degradation, signal distortion). By having multiple conditions complement each other, various fault scenarios such as hardware damage, path interruption, signal distortion, and network no-response are covered, improving the robustness and sensitivity of fault detection.

[0012] In the exemplary embodiment, the primary positioning link is a multi-source fusion positioning link; the backup positioning link is a single positioning device positioning link.

[0013] Based on the aforementioned technical means, the emergency call system achieves an optimal balance between accuracy and reliability through differentiated configuration of the primary and backup positioning links.

[0014] In an exemplary embodiment, the multi-source fusion positioning link includes: a first global satellite navigation and positioning system, a second global satellite positioning system, and a cellular mobile communication system-on-a-chip; the first global satellite navigation and positioning system and the second global satellite positioning system are respectively communicatively connected to the cellular mobile communication system-on-a-chip; the preset positioning conditions include at least one of the following: the number of available satellites in the first global satellite navigation and positioning system and / or the second global satellite positioning system is less than a preset number; the positioning error between the first global satellite navigation and positioning system and the second global satellite positioning system is greater than a preset error; and communication between the cellular mobile communication system chip and the first global satellite navigation and positioning system and / or the second global satellite positioning system is interrupted.

[0015] Based on the aforementioned technical means, when the number of available satellites is insufficient, the calculation deviation between the first and second global satellite navigation and positioning systems is too large, or physical communication is interrupted, the primary positioning link is determined to have failed, and the system automatically switches to the backup positioning link. This comprehensively covers various failure scenarios such as signal quality degradation, inconsistent calculations, and hardware failures, ensuring the continuity and reliability of emergency call location reporting.

[0016] In an exemplary embodiment, the positioning module further includes a primary cellular mobile communication antenna and a backup cellular mobile communication antenna; the control module is also configured to switch the antenna currently receiving base station signals from the primary cellular mobile communication antenna to the backup cellular mobile communication antenna in the event of failure of the primary cellular mobile communication antenna; the primary cellular mobile communication antenna is an external 4G or 5G antenna mounted on the vehicle; the backup cellular mobile communication antenna is a 4G antenna built into the vehicle.

[0017] Based on the aforementioned technical means, through a dual-antenna redundancy architecture consisting of an external primary cellular mobile communication antenna and a built-in backup cellular mobile communication antenna, the emergency call system can quickly switch to the built-in 4G antenna when the primary cellular mobile communication antenna fails due to collision damage or signal abnormality, ensuring continuous network connectivity and uninterrupted emergency communication capabilities. This solution effectively solves the problem of communication interruption caused by damage to external antennas during accidents, significantly improving the communication reliability of the emergency call system.

[0018] In an exemplary embodiment, the positioning module further includes: a satellite positioning and navigation antenna and a main cellular mobile communication antenna; the backup call link includes: a call device; the emergency call system further includes: a target voltage divider network; the target voltage divider network is communicatively connected to the control module; wherein, the target voltage divider network is used to acquire voltage from the target device, obtain the acquired voltage, and send the acquired voltage to the control module; the target device is the satellite positioning and navigation antenna, the main cellular mobile communication antenna, and the device in the call device located on the vehicle; the control module is also used to perform fault detection on the target device based on the acquired voltage.

[0019] Based on the above technical means, the electrical status of each external device is converted into a quantifiable voltage signal through the target voltage divider network. The control module collects the signal in real time and compares it with the preset voltage threshold, which can accurately determine whether the device is open-circuited, short-circuited, or malfunctioning.

[0020] In an exemplary embodiment, the emergency call system further includes a power supply module; the power supply module includes a main power supply and a backup power supply; the main power supply and the backup power supply are respectively communicatively connected to the control module; the control module is also used to switch the current power supply from the main power supply to the backup power supply in the event of a main power supply failure.

[0021] Based on the above technical means, in the event of a main power failure, the current power supply can be switched from the main power supply to the backup power supply, which can ensure continuous operation when the main power supply fails. This ensures that voice calls, location reporting, and communication links are not interrupted due to power outages, significantly improving the system's power supply reliability and occupant safety assurance capabilities in extreme accident scenarios.

[0022] In an exemplary embodiment, the emergency call system further includes: a detection chip; the detection chip is communicatively connected to a backup power supply and a control module respectively; the detection chip is used to collect electrical characteristics of the backup power supply; determine the state of charge and health status of the backup power supply based on the electrical characteristics; and send the state of charge and health status to the control module when the state of charge and health status meet the warning conditions; the warning conditions include at least one of the following: the state of charge is less than a preset safe state of charge limit, and the health status indicated is less than a preset lower limit of health status; the control module is also used to issue warnings based on the state of charge and health status.

[0023] Based on the aforementioned technical methods, the system achieves intelligent management and control of the backup power supply throughout its entire lifecycle by using a detection chip to monitor the SOC and SOH of the backup power supply in real time. SOC warnings ensure sufficient power, while SOH warnings prevent battery aging and failure; the two complement each other to ensure the availability of the backup power supply in critical moments.

[0024] In an exemplary embodiment, the backup power supply is charged by the main power supply during vehicle operation.

[0025] Based on the above technical means, the backup power supply is charged during vehicle operation to ensure that the backup power supply can maintain vehicle operation and ensure vehicle operation safety when the main power supply fails.

[0026] In an exemplary embodiment, the control module is further configured to make an emergency call through the main call link when there is an emergency call requirement and the main call link is fault-free.

[0027] Based on the aforementioned technical means, emergency calls are prioritized using the main call link under normal circumstances, making full use of the high-performance advantages of the vehicle's built-in microphone and speaker to ensure the best call quality and experience.

[0028] In a second aspect, embodiments of this application provide an emergency call method, applied to a controller in the emergency call system of the first aspect described above; including: when there is an emergency call demand and the main call link fails, switching the current call link to a backup call link so as to make an emergency call through the backup call link.

[0029] In an exemplary embodiment, the emergency call system further includes: a positioning module; the positioning module includes: a primary positioning link and a backup positioning link; a control module is communicatively connected to the primary positioning link and the backup positioning link respectively; the emergency call method further includes: during the emergency call process, determining whether the primary positioning link meets preset positioning conditions; if the primary positioning link meets the preset positioning conditions, switching the current positioning link from the primary positioning link to the backup positioning link, so as to determine the positioning location through the backup positioning link and send out the positioning location; wherein, when the primary positioning link meets the preset positioning conditions, the positioning accuracy is less than the preset accuracy.

[0030] Thirdly, embodiments of this application provide a vehicle including the emergency call system described in the first aspect.

[0031] Fourthly, this application provides an electronic device comprising: a processor and a memory; the memory storing processor-executable instructions. When the processor is configured to execute the instructions, the electronic device implements the emergency call method described in the second aspect above.

[0032] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions that, when executed by a processor, implement the emergency call method of the second aspect described above.

[0033] In a sixth aspect, embodiments of this application provide a computer program product including computer program instructions that, when executed by a processor, implement the emergency call method described in the second aspect.

[0034] It should be noted that the technical effects of any of the implementation methods in aspects two through six can be found in the technical effects of the corresponding implementation methods in aspect one, and will not be repeated here.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0037] Figure 1 This is a schematic diagram of the structure of a vehicle disclosed in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an emergency call system disclosed in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of another emergency call system disclosed in an embodiment of this application; Figure 4 This is a flowchart illustrating the switching process of a primary / backup call link as disclosed in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of another emergency call system disclosed in an embodiment of this application; Figure 6 This is a flowchart illustrating the switching process of a primary / backup positioning link as disclosed in an embodiment of this application. Figure 7 This is a diagnostic diagram of a target voltage divider network disclosed in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of another emergency call system disclosed in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of another emergency call system disclosed in an embodiment of this application; Figure 10 This is a schematic diagram of the structure of another emergency call system disclosed in an embodiment of this application; Figure 11 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures: 101-Emergency Call System, 202-Voice Call Module, 501-Location Module, 801-Power Supply Module, 1010-Target Voltage Divider Network, 201-Control Module, 2021-First Microphone, 2022-First Speaker, 2023-Audio Codec Module, 2024-Audio Power Amplification Module, 2025-Second Microphone, 2026-Second Speaker, 2011-Control Unit, 2012-Control Chip, 2013-First Power Supply Management Module, 2014-Second Power Supply Management Module, 2015-Third Power Supply Management Module, 201... 2a-Second microphone diagnostic module, 2012b-Second speaker diagnostic module, 2012c-Backup power supply diagnostic module, 2012d-Satellite positioning and navigation antenna diagnostic module, 2012e-Cellular mobile communication antenna diagnostic module, 5011-Built-in multi-source satellite positioning and navigation antenna, 5012-Vehicle external single-satellite positioning and navigation antenna, 5013-External multi-source satellite positioning and navigation antenna, 5014-Main cellular mobile communication antenna, 5015-Filter module, 5016-Backup cellular mobile communication antenna, 8011-Main power supply, 8012-Backup power supply. Detailed Implementation

[0039] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate the orientation of the referred device or component in an actual application scenario.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0041] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] The term "electrical connection" refers to the flow of current or signal from one conductor to another. An electrical connection between A and B means that current or signal can flow from A to B and vice versa. This connection includes direct and indirect electrical connections. A direct electrical connection between A and B means that A and B are physically connected. An indirect electrical connection between A and B means that A and B are connected via C, where C can be at least one wire or device.

[0043] The embodiments of this application are described below with reference to the accompanying drawings.

[0044] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle disclosed in an embodiment of this application. The vehicle 100 can be, but is not limited to, a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0045] In this embodiment of the application, the vehicle 100 includes an emergency call system 101, which can initiate an emergency call to a Public Safety Answering Point (PSAP) and report the vehicle's location and accident information in the event of a collision or emergency.

[0046] However, since the emergency call system 101 relies on the microphone and speaker modules provided by the vehicle's infotainment system, the emergency voice call will be directly interrupted if the infotainment system is damaged or loses power during an accident.

[0047] Based on this, this application provides an emergency call system 101, such as... Figure 2 As shown, the emergency call system 101 includes a control module 201 and a voice call module 202.

[0048] The voice call module 202 includes a primary call link and a backup call link; the control module 201 is communicatively connected to the primary call link and the backup call link respectively.

[0049] In some embodiments, the main call link includes a first microphone (Mic1) and a first miniature speaker (Speaker1).

[0050] Among them, such as Figure 3 As shown, the first microphone and the first miniature speaker are both native audio acquisition and playback hardware pre-installed in the vehicle and integrated within the Cockpit Domain Controller (CDC). They communicate with other onboard electronic control devices via a Universal Serial Bus (USB), relying entirely on the vehicle's 12V battery for power and the vehicle's electrical and control systems for normal operation. If any fault occurs, such as damage to the CDC hardware, disconnection of the vehicle's low-voltage power supply, or a break in the onboard communication bus, the main call link will fail directly, resulting in the loss of voice transmission and reception capabilities in emergency call scenarios and the inability to complete voice communication with public safety answering points.

[0051] As a feasible implementation method, the main call link primarily carries emergency call services based on Voice over Long-Term Evolution (VoLTE), relying on the vehicle's built-in 4G / 5G cellular communication module to realize two-way voice interaction, emergency vehicle condition data reporting and transmission between the vehicle and the Public Safety Response Point (PSAP).

[0052] In an exemplary embodiment, the control module is further configured to make an emergency call through the main call link when there is an emergency call requirement and the main call link is fault-free.

[0053] In some embodiments, the backup call link includes a second microphone (Mic2) and a second miniature speaker (Speaker2).

[0054] The backup call link is a dedicated audio channel that serves the vehicle emergency call system 101 independently. It is physically isolated from the main call link and its electrical circuits are completely isolated, so that they do not interfere with each other.

[0055] like Figure 3 As shown, the second microphone and the second miniature speaker can be integrated into the Telematics Box (TBOX), powered by an independent backup power supply, and are not affected by the failure of the vehicle's 12V low-voltage circuit. They can independently support emergency voice communication after the main link fails.

[0056] In some embodiments, the control module 201 is used to make an emergency call through the main call link when there is an emergency call requirement and the main call link is fault-free.

[0057] An emergency call request refers to an event that the vehicle detects, which meets preset triggering conditions, indicating that the vehicle is in an emergency and needs to immediately request assistance from a Public Safety Response Point (PSAP).

[0058] For example, preset triggering conditions may include: the vehicle acceleration sensor detecting deceleration exceeding a threshold, the airbag control unit issuing a deployment signal, the vehicle attitude sensor detecting rollover or overturning, the smoke sensor detecting a fire signal, or the occupant manually triggering the emergency call function via physical buttons or voice commands.

[0059] As a feasible implementation method, when a vehicle collision is detected and the airbags deploy, an emergency call requirement is determined. If an emergency call requirement is determined, an emergency call request is initiated to the Public Safety Response Point (PSAP) based on the main call link. The audio signal is monitored in real time. If it is confirmed that the microphone and speaker are working properly, the audio path is normal, the communication module is successfully registered, and the signal strength meets the call requirements, and the main call link is confirmed to be fault-free, the call continues until the rescue center hangs up on its own or the emergency is resolved.

[0060] In some embodiments, the control module 201 is configured to switch the current call link to a backup call link in the event of an emergency call requirement and a failure of the primary call link, so as to make an emergency call through the backup call link.

[0061] As a feasible implementation method, a main call link failure refers to a state in which an emergency call cannot be established or maintained through the main call link due to the first microphone (Mic1) and / or the first miniature speaker (Speaker1) failing to work properly, the vehicle host power supply being interrupted, the USB bus communication being abnormal, the vehicle communication module being disconnected from the network, or any combination of the above.

[0062] It should be understood that due to the vehicle's emergency call requirement, but the failure of the main call link, the emergency voice call could not be established or the ongoing call was unexpectedly interrupted, the rescue request could not be transmitted to the Public Safety Response Point (PSAP) in a timely manner, and the critical accident location and vehicle information could not be uploaded.

[0063] To meet the emergency rescue communication needs, the current call link is switched to the backup call link in a timely manner so that emergency calls can be made through the backup call link. This ensures that voice communication between passengers and the rescue center can continue, thereby improving the reliability of emergency communication and overall safety of the vehicle in extreme accident scenarios.

[0064] As a feasible implementation method, the control module 201 is used to determine the main call link failure when the main call link meets the call link failure determination conditions.

[0065] The call link failure determination criteria include at least one of the following: the main call link has missing audio, the main call link does not receive a response after an emergency call is made, or the audio amplitude of the main call link is not within the standard audio amplitude range.

[0066] It should be understood that audio loss means the microphone cannot pick up valid uplink voice signals or the speaker cannot output downlink voice signals, which directly prevents the two parties in the call from effectively exchanging information. Therefore, if there is audio loss in the primary call link, it can be determined that the primary call link is faulty.

[0067] In an exemplary embodiment, the control module 201 determines that there is an audio missing in the main call link when it reads through the audio codec that there is no valid data in the uplink audio buffer for multiple consecutive sampling periods, or that no playback signal is detected in the downlink audio path.

[0068] It should be understood that if an emergency call is not responded to, it indicates that the call request failed to reach the Public Safety Answering Point (PSAP) or that the other party failed to establish a voice connection, making it impossible to convey the rescue request. Therefore, when the primary call link does not respond after an emergency call is made, a primary call link failure can be identified.

[0069] In an exemplary embodiment, the control module 201 starts a timer after sending an emergency call request. If no call connection confirmation signaling from the PSAP or a call failure indication returned by the operator network is received within a preset timeout period (e.g., 15 seconds), it determines that the main call link has not received a response after the emergency call was sent.

[0070] It should be understood that if the audio amplitude is not within the standard range, it means that the voice signal captured by the microphone is too weak (possibly due to device damage or obstruction) or too strong (possibly due to signal distortion or interference), which cannot guarantee the clarity and intelligibility of the call, affecting the rescue center's accurate assessment of the passenger's condition and on-site information. Therefore, if the audio amplitude of the main call link is not within the standard audio amplitude range, a main call link failure can be determined.

[0071] In an exemplary embodiment, the control module 201 samples the amplitude of the uplink audio signal in real time. When it detects that the amplitude of multiple consecutive sampling points is lower than a preset lower threshold (e.g., -40dB) or higher than a preset upper threshold (e.g., 0dBFS), it determines that the audio amplitude of the main call link is not within the standard audio amplitude range.

[0072] As a feasible implementation method, such as Figure 4As shown, when the control module determines that there is an emergency call requirement, it initiates the main call link to make an emergency call; it performs communication detection on the main call link and obtains the communication detection result; based on the communication detection result, it determines whether the main call is faulty; if not, it maintains the main call link to make an emergency call; if so, it switches the current call link to the backup call link to keep the call uninterrupted.

[0073] By using call link fault determination criteria, the control module 201 can detect the audio integrity, response status, and signal quality of the main call link in real time or periodically, accurately identifying link faults within milliseconds to avoid emergency call failures due to misjudgment or omission. Furthermore, the call link fault determination criteria require at least one condition to trigger the determination, with multiple conditions complementing each other, covering various fault scenarios such as hardware damage, path interruption, signal distortion, and network unresponsiveness, thus improving the robustness of fault detection.

[0074] As a feasible implementation method, the control module 201 includes: a voice link detection unit and a first switching unit.

[0075] The voice link detection unit and the first switching unit are connected in communication.

[0076] As a feasible implementation method, the voice link detection unit is used to perform communication detection on the main call link and send the communication detection results to the first switching unit.

[0077] In the exemplary embodiment, communication detection refers to real-time or periodic functional verification of the main call link's audio acquisition capability, audio playback capability, data transmission path status, and network registration status of the communication module, in order to determine whether the main call link has the conditions to initiate and maintain an emergency call.

[0078] Communication detection results refer to the judgment information that reflects the current working status of the main call link.

[0079] Communication test results include, but are not limited to: whether the first microphone (Mic1) can collect valid audio signals, whether there is continuous silence, signal interruption or abnormal amplitude; whether the first miniature speaker (Speaker1) can play test audio normally, whether there is an open circuit or short circuit in the playback path; whether the data interaction with the vehicle host and other devices via the USB bus is normal, whether there is a timeout or bit error in the communication; whether the vehicle 4G / 5G communication module has been successfully registered to the mobile network, whether the current signal strength is higher than the preset call threshold; and whether the emergency call request initiated to the Public Safety Answering Point (PSAP) receives a connection confirmation signal within a preset time.

[0080] It should be understood that any abnormality in any link of the primary call link may prevent the establishment of an emergency call or cause the call to be interrupted. Therefore, by continuously monitoring the above-mentioned indicators through the voice link detection unit, corresponding communication detection results can be generated quickly and accurately when the primary call link fails, and these results can be sent to the first switching unit to provide a reliable basis for subsequent link switching decisions. If the communication detection results indicate one or more abnormalities in the primary call link, it is considered a primary call link failure; conversely, if all detection items pass, the primary call link is determined to be in normal working condition.

[0081] As a feasible implementation method, the first switching unit is used to determine whether the primary call link meets the call link failure judgment conditions based on the communication detection results; if the primary call link meets the call link failure judgment conditions, the primary call link is determined to be faulty, and the current call link is switched from the primary call link to the backup call link.

[0082] In an exemplary embodiment, after a severe collision, the airbags deploy, and the control module 201 determines that there is an emergency call requirement. After the emergency call (ECALL) is triggered, the main control unit first attempts to establish a VoLTE call using the main call link (vehicle-to-everything voice link).

[0083] At the same time, the voice link detection unit continuously detects the communication of the main call link.

[0084] Specifically, the voice link detection unit periodically checks the main call link for normal operation every preset period (10ms) via Controller Area Network (CAN) communication, through methods such as audio input detection and bus health detection. In this exemplary scenario, due to a collision causing a break in the power supply line of the vehicle's main unit, the first microphone (Mic1) and the first miniature speaker (Speaker1) completely lose power, resulting in the failure of audio acquisition and playback functions. The voice link detection unit detects both audio uplink and audio downlink loss within three consecutive detection cycles (i.e., 30ms), meeting the fault determination condition of "audio loss within three consecutive cycles".

[0085] The voice link detection unit sends the communication detection results (missing uplink audio and missing downlink audio) to the first switching unit. After receiving the communication detection results, the first switching unit compares them with the preset call link fault determination conditions and confirms that the condition of "missing audio in the main call link" is met, thereby determining that the main call link is faulty.

[0086] Subsequently, the first switching unit completes the switching operation within a preset time (e.g., 100ms): shuts down the main call link (vehicle voice link), releases relevant audio resources, and simultaneously enables the second microphone (Mic2) and the second miniature speaker (Speaker2) of the backup call link to take over the voice call.

[0087] After the entire handover process is completed, the emergency call system 101 continues to make emergency calls to the Public Safety Answering Point (PSAP) to keep the call uninterrupted.

[0088] Through the above mechanism, even if the vehicle's infotainment system completely fails in an accident, this technical solution can still complete the link switch within a few hundred milliseconds, ensuring that the voice communication between the occupants and the rescue center continues, which significantly improves the reliability and safety of emergency communication in extreme accident scenarios.

[0089] It should be understood that the setup of the first switching unit enables automated identification and rapid disaster recovery switching of the main call link failure. Compared to existing technologies where emergency calls completely fail due to a single point of failure in the vehicle's infotainment system, this solution can complete link switching within milliseconds, ensuring uninterrupted emergency calls and significantly improving the reliability of emergency communication and occupant safety in extreme accident scenarios.

[0090] In some embodiments, such as Figure 5 As shown, the emergency call system 101 also includes a positioning module 501.

[0091] The positioning module 501 includes a primary positioning link and a backup positioning link. The control module 201 is communicatively connected to both the primary and backup positioning links.

[0092] In the exemplary embodiment, the control module 201 can communicate with the main positioning link via serial port Uart1; the control module 201 can also communicate with the backup positioning link via serial port Uart2; both the main positioning link and the backup positioning link are placed inside the TBOX to achieve redundant acquisition and processing of positioning signals.

[0093] It should be understood that, when the main positioning link is working normally, the positioning module 501 can obtain high-precision location information of the vehicle (including longitude, latitude, driving direction and real-time speed at the time of collision) through the main positioning link; when the main positioning link cannot provide effective positioning data due to satellite signal loss, hardware failure or external interference, the backup positioning link can take over the positioning function in a timely manner and continue to output vehicle location information, ensuring that the emergency call system 101 can always report the accurate accident location to the Public Safety Response Point (PSAP), thereby ensuring that rescue forces can arrive at the scene quickly.

[0094] In some embodiments, the primary positioning link is a multi-source fusion positioning link; the backup positioning link is a single positioning device positioning link.

[0095] As a feasible implementation method, the multi-source fusion positioning link includes: a first global satellite navigation and positioning system, a second global satellite positioning system, and a cellular mobile communication system-on-a-chip.

[0096] The first global satellite navigation and positioning system and the second global satellite positioning system are respectively connected to the cellular mobile communication system-on-a-chip.

[0097] The first global satellite navigation and positioning system can be the BeiDou navigation and positioning system.

[0098] The second global satellite navigation and positioning system can be the GPS navigation and positioning system.

[0099] A multi-source fusion positioning link based on the BeiDou Navigation Satellite System and the Global Positioning System (GPS) can be used as a dual-mode positioning link for the Global Navigation Satellite System (GNSS). This GNSS dual-mode positioning link supports fusion positioning between BeiDou and GPS, employing multi-band joint calculation of L1+L5 (GPS) and B1C+B2a (BeiDou) frequencies to output positioning data in NMEA format. It boasts higher positioning accuracy, stronger resistance to multipath interference, and availability in complex environments such as urban canyons.

[0100] For example, when the multi-source fusion positioning link is working normally, the cellular mobile communication system-on-a-chip simultaneously receives signals from BeiDou and GPS satellites. It then uses observations from multiple frequency points of the BeiDou and GPS navigation and positioning systems to perform joint positioning calculations, providing continuous, stable, and high-precision location information (e.g., horizontal positioning accuracy better than 1 meter) in open environments or complex road scenarios. This link serves as the primary positioning link and is prioritized for location reporting in the emergency call system 101.

[0101] It should be understood that multi-source fusion positioning links are not limited to only the BeiDou and GPS satellite navigation systems. Other global navigation satellite systems (GNSS) can be appropriately added based on actual application needs and technological development to further improve positioning accuracy, availability, robustness, and coverage.

[0102] The backup positioning link is a single-device positioning link, which can be a standalone, externally attached domestically produced BeiDou single-mode GNSS module. This domestically produced BeiDou single-mode GNSS module operates independently of the multi-source fusion positioning link and possesses BeiDou priority positioning and BeiDou single-mode NMEA statement output capabilities.

[0103] If the main positioning link is unable to output valid positioning data due to satellite signal interference, multi-band fusion calculation abnormality, SOC hardware failure, or power supply abnormality, the control module 201 can switch to the backup positioning link, whereby the Beidou single-mode GNSS module independently completes the reception and positioning calculation of Beidou satellite signals and continues to output NMEA format location information.

[0104] It should be understood that while the main positioning link has advantages such as high precision, multi-band, and multi-system integration, its normal operation depends on the overall integrity of the 4G / 5G SOC and the stable reception of BeiDou and GPS dual-system satellite navigation signals. If a serious collision occurs, resulting in damage to the SOC hardware or power outage, or if the vehicle is in an environment with severe satellite signal obstruction, such as a tunnel, underground garage, or valley, the main positioning link may be unable to output positioning data that meets the needs of an emergency call.

[0105] At this point, the independence and autonomous controllability of the backup positioning link become particularly crucial. As a pure BeiDou single-mode solution, the backup positioning link has the following advantages: First, it does not rely on GPS signals, thus avoiding positioning failures caused by the unavailability of GPS signals.

[0106] Second, it does not rely on the normal operation of cellular mobile communication system-on-a-chip and has physical and electrical independence.

[0107] Third, it supports the BeiDou priority positioning strategy, which meets the technical requirements of domestic production and independent control.

[0108] When the primary positioning link fails, the backup positioning link can independently output location information based on the BeiDou system. Although its positioning accuracy is slightly lower than that of the multi-source fusion positioning mode (e.g., horizontal positioning accuracy is better than 5-10 meters), it is sufficient to meet the basic requirements of the emergency call system 101 for reporting accident locations, ensuring that rescue forces can quickly arrive at the scene.

[0109] As a feasible implementation method, the control module 201 is also used to determine whether the main positioning link meets the preset positioning conditions during the emergency call process; if the main positioning link meets the preset positioning conditions, the current positioning link is switched from the main positioning link to the backup positioning link so as to determine the positioning location through the backup positioning link and send the positioning location.

[0110] In an exemplary embodiment, the control module 201 determines that an emergency call is in progress based on the trigger signal of the emergency call system 101 (e.g., an airbag deployment signal or a manually triggered emergency call button signal). To facilitate accurate acquisition of the accident vehicle's location information by the Public Safety Response Point (PSAP) for rapid dispatch of rescue forces, real-time location information is required.

[0111] Among them, the positioning accuracy of the main positioning link is less than the preset accuracy when the preset positioning conditions are met.

[0112] The preset positioning conditions include at least one of the following: the number of available satellites in the first global satellite navigation and positioning system and / or the second global satellite positioning system is less than the preset number; the positioning error between the first global satellite navigation and positioning system and the second global satellite positioning system is greater than the preset error; and communication between the cellular mobile communication system chip (such as 4G / 5G SOC) and the first global satellite navigation and positioning system and / or the second global satellite positioning system is interrupted.

[0113] The preset number refers to the minimum number of satellites required to support effective two-dimensional positioning calculations. In satellite navigation and positioning principles, two-dimensional positioning (longitude and latitude) requires simultaneous observation of at least three satellites. Considering the redundancy and reliability of actual positioning calculations, the preset number is usually set to three. When fewer than three satellites are available, the satellite geometry is poor, making it impossible to calculate reliable two-dimensional position information using triangulation. In this case, the positioning result is invalid or has extremely low accuracy.

[0114] The preset error refers to the maximum permissible deviation between the positions calculated independently by the BeiDou Navigation Satellite System and the GPS Navigation Satellite System. The preset error is used to determine whether the calculation results of the two independent positioning systems are consistent. When the position deviation calculated by BeiDou and GPS exceeds the preset error (e.g., 10 meters), it indicates that the multi-source fusion positioning may be affected by multipath interference, atmospheric delay, abnormal satellite signals, or single-system failures. The confidence level of the fusion positioning result is insufficient, and it should not be used for location reporting in emergency calls.

[0115] It should be understood that satellite positioning relies on the receiver simultaneously observing multiple satellites and calculating the receiver's position by measuring the time difference of signal propagation. When fewer than three satellites are available, the positioning equations are in an underdetermined state, and the two-dimensional position coordinates cannot be uniquely determined. In this case, the output positioning result is either invalid or generated based on extrapolation or assumptions, resulting in a large error.

[0116] As two independent satellite navigation systems, BeiDou and GPS should, under normal circumstances, calculate positions that are highly consistent, with deviations typically within the meter range. If the deviation exceeds a preset error (e.g., 10 meters), it indicates that at least one system has been severely interfered with (e.g., multipath effects, ephemeris errors, atmospheric anomalies). In this case, the fused solution is unreliable, and directly using the result of either single system also carries risks.

[0117] If the physical communication link (such as UART, I2C, USB) between the 4G / 5G SOC and the BeiDou or GPS receiver is interrupted, the main positioning link will be unable to acquire any raw observation data or calculation results, and the positioning function will be physically unavailable. At this time, the positioning validity flag in the NMEA positioning statement output by the cellular mobile communication system-on-a-chip (4G / 5G SOC) will be set to invalid (for example, the positioning status flag in the GGA statement will be set to "V" or "0"), indicating that the currently output positioning data is invalid and cannot be used for location reporting.

[0118] In summary, when any of the above-mentioned preset positioning conditions are met, it indicates that the positioning accuracy of the primary positioning link is less than the preset accuracy threshold, and the currently output location information is unreliable or unavailable. At this time, it is necessary to switch the current positioning link from the primary positioning link to the backup positioning link, so that the backup positioning link can continue to determine the positioning location and send it out, to ensure that the emergency call system 101 can always report accurate accident location information to the Public Safety Response Point (PSAP).

[0119] In the exemplary embodiment, the positioning module 501 acquires the original satellite observation data and positioning calculation results, and continuously outputs positioning statements in NMEA format; the control module 201 continuously parses the NMEA positioning statements at a preset frequency (e.g., 1Hz); based on the number of available satellites, the positioning accuracy error value, and the positioning status identifier obtained from the parsing, it determines whether the preset positioning conditions are met.

[0120] For example, such as Figure 6 As shown, during an emergency call, the control module activates the primary positioning link; performs positioning based on the primary positioning link; checks whether the primary positioning link meets the preset positioning conditions; if so, it determines that the primary positioning link is unavailable, shuts down the data channel of the primary positioning link, and switches the current positioning link from the primary positioning link to the backup positioning link to perform positioning through the positioning link; if not, it performs positioning based on the primary positioning link.

[0121] It should be understood that through the above switching mechanism, the emergency call system 101 can still rely on the backup positioning link in extreme scenarios (such as when GPS signal is unavailable, 4G / 5G SOC fails, or satellite signal is severely blocked), that is, the Beidou single-mode GNSS module independently outputs effective positioning results, thereby completely getting rid of dependence on GPS signal.

[0122] Specifically, the backup positioning link adopts a pure BeiDou single-mode positioning scheme, with a single BeiDou positioning accuracy of ≤3 meters (horizontal circular error probability), which is sufficient to meet the basic requirements of the emergency call system 101 for reporting accident locations; it does not rely on GPS signals, is physically independent of the main positioning link, and has high reliability and anti-interference capabilities; at the same time, it adopts the domestic BeiDou scheme, which meets the national independent and controllable technology strategy requirements.

[0123] Based on the above technical solutions, the rescue platform (Public Safety Response Point, PSAP) can accurately identify the location information of the accident vehicle (including longitude, latitude, and direction of travel), effectively avoiding rescue delays or incorrect dispatches caused by positioning deviations or failures, thereby significantly improving rescue timeliness and passenger safety.

[0124] In some embodiments, the positioning module 501 further includes: a primary cellular mobile communication antenna and a backup cellular mobile communication antenna; As a feasible implementation method, the control module 201 is also used to switch the antenna currently receiving base station signals from the primary cellular mobile communication antenna to the backup cellular mobile communication antenna in the event of failure of the primary cellular mobile communication antenna.

[0125] The main cellular mobile communication antenna is an external 4G or 5G antenna mounted on the vehicle, which can provide higher signal gain, wider frequency band support (including 4G and 5G frequency bands) and better communication speed, meeting the needs of emergency calls for high-speed data transmission and high-quality VoLTE voice calls.

[0126] The backup cellular mobile communication antenna is a 4G antenna built into the vehicle, which can provide basic fourth-generation mobile communication (4G) signal reception and transmission capabilities. In the event of damage to the main antenna due to collision, breakage of the wiring harness, or abnormal signal, it serves as a redundancy guarantee to maintain basic network dwell and emergency call communication capabilities.

[0127] In the exemplary embodiment, the failure of the primary cellular mobile communication antenna refers to situations where the external antenna is physically damaged due to a vehicle collision, the connection between the antenna and the feeder is broken, the antenna impedance is severely mismatched, or the signal strength (RSRP / RSRQ) received by the antenna is consistently lower than a preset threshold, making normal communication impossible. Therefore, in the event of a primary cellular mobile communication antenna failure, it is necessary to switch the antenna currently receiving base station signals from the primary cellular mobile communication antenna to the backup cellular mobile communication antenna to ensure that the communication link of the emergency call system 101 is not interrupted.

[0128] If the control module 201 detects that the main cellular mobile communication antenna meets the failure conditions, it can determine that the main cellular mobile communication antenna has failed.

[0129] The failure conditions include at least one of the following: abnormal antenna physical status detection (e.g., an open circuit or short circuit detected by the antenna detection circuit); downlink signal strength (RSRP) being lower than a preset threshold (e.g., RSRP < -120dBm) for multiple consecutive measurement cycles (e.g., 3 consecutive cycles, each 100ms); uplink transmit power continuously reaching the maximum value but still unable to establish synchronization or maintain a connection with the base station; and the communication module reporting an antenna fault code or network failure indication.

[0130] For example, when the control module 201 determines that the external 5G antenna has failed, it immediately switches the communication link to the built-in 4G antenna via the SAW (Surface Acoustic Wave) filter module. The SAW filter module features low insertion loss and high selectivity, enabling it to complete the RF path switching within milliseconds. This ensures that the emergency call system 101 does not lose network connectivity during the switching process, continuously remaining on the mobile communication network and guaranteeing uninterrupted emergency communication capabilities. After the switch is complete, the emergency call system 101 continues to support VoLTE emergency calls and location data reporting using the built-in 4G antenna.

[0131] It should be understood that external antennas typically offer higher gain and superior radiation performance, providing more stable signal coverage and higher data transmission rates, making them the preferred antenna for the emergency call system 101. However, in the event of a severe collision, external antennas (such as shark fin antennas or rear window antennas) are highly susceptible to damage, leading to a sharp decline in antenna performance or complete failure. Without a backup antenna solution, the communication link of the emergency call system 101 will be completely severed, preventing rescue requests from being sent and seriously impacting occupant safety.

[0132] By setting up a built-in 4G antenna as a backup and employing a SAW filter module for rapid switching, this technical solution can quickly switch the communication link to the backup antenna in extreme scenarios where the main antenna fails, ensuring the emergency call system 101 remains connected and its emergency communication capabilities are uninterrupted. Although the gain and performance of the built-in antenna may be slightly lower than that of an external antenna, it is sufficient to meet the basic requirements of emergency calls for voice communication and location data reporting, thereby significantly improving the reliability of emergency communication and the success rate of rescue in accident scenarios.

[0133] In some embodiments, the positioning module 501 further includes: a satellite positioning and navigation antenna and a main cellular mobile communication antenna; the backup call link includes: a call device (i.e., a second microphone and a second speaker).

[0134] As a feasible implementation method, the emergency call system 101 also includes: a target voltage divider network; the target voltage divider network is communicatively connected to the control module 201; The target voltage divider network is used to acquire the voltage of the target device, obtain the acquired voltage, and send the acquired voltage to the control module 201.

[0135] The target devices are satellite positioning and navigation antennas, main cellular mobile communication antennas, and calling devices located on the vehicle.

[0136] The control module 201 is also used to perform fault detection on the target device based on the acquired voltage.

[0137] In an exemplary embodiment, the target voltage divider network includes: a voltage divider resistor network and a voltage sampling channel corresponding to each target device.

[0138] For example, when the target device is a second microphone, the second microphone is connected to the control module 201 through the first voltage divider network (including resistors R1, R2, and R3); the control module 201 determines whether the second microphone is open-circuited, short-circuited, or malfunctioning by real-time sampling of the voltage divider voltage and according to a preset voltage threshold.

[0139] When the target device is a second speaker, the second speaker is connected to the control module 201 through the second voltage divider network (including resistors R4, R5, and R6); the control module 201 realizes online status and functional integrity diagnosis of the second speaker by real-time sampling of the voltage divider voltage.

[0140] When the target device is a satellite positioning and navigation antenna, the satellite positioning and navigation antenna is connected to the control module 201 through the third voltage divider network (including resistor R7); the control module 201 determines whether the external GNSS antenna is detached, open-circuited or short-circuited by collecting the voltage difference across resistor R7, thereby realizing real-time diagnosis of antenna in-situ status.

[0141] When the target device is a main cellular mobile communication antenna, the main cellular mobile communication antenna is connected to the control module 201 through the fourth voltage divider network (including resistors R8, R9, and R10); the control module 201 diagnoses whether the external 4G / 5G antenna is faulty by real-time sampling of the voltage divider voltage.

[0142] Optionally, the control module 201 can also be connected to a backup power source (such as a nickel-metal hydride backup battery) via a voltage sampling circuit; by collecting the voltage value of the backup power source in real time and combining it with a preset state of charge (SOC) algorithm, the module can determine the presence, state of health (SOH), and remaining power of the backup power source, thereby achieving full-cycle monitoring of the backup power system.

[0143] Furthermore, the control module 201 is also used to classify the detected faults according to their severity and execute corresponding response strategies.

[0144] Level 1 Fault (Minor): Does not affect core emergency functions. Preset judgment conditions include, but are not limited to: NiMH battery SOC is in the first preset range (e.g., 10%~20%), vehicle voice link is temporarily lost, communication signal strength is lower than the first preset threshold but can maintain basic communication; the corresponding response strategy may include, but is not limited to: instrument panel text reminder, APP push alarm, local log storage, without triggering redundancy switching action.

[0145] Level 2 Fault (Severe): Affects some functions and poses a risk of emergency failure. Preset judgment conditions include, but are not limited to: GNSS positioning loss, communication signal strength below the second preset threshold (e.g., -110dBm), and NiMH battery SOC within the second preset range (e.g., 5%~10%); corresponding response strategies may include, but are not limited to: audible and visual alarms, activation of redundant modules (e.g., switching to single BeiDou positioning, triggering network re-search), and background fault reporting; Level 3 Fault (Fatal): Directly causes the emergency call function to fail. Preset judgment conditions include, but are not limited to: interruption of main vehicle power (12V small battery), NiMH battery SOC below the third preset threshold (e.g., <5%), failure of both voice links, and complete communication interruption; the corresponding response strategies may include, but are not limited to: emergency alarm, automatic switch to backup power supply, priority reporting to the emergency platform, and ensuring emergency call triggering.

[0146] In summary, as Figure 7 As shown, through the target voltage divider network, the second microphone, second speaker, satellite positioning and navigation antenna, main cellular mobile communication antenna, backup power capacity, and backup power life can be diagnosed separately. Multi-level fault judgment criteria are set to classify and identify minor faults, serious faults, and fatal faults. At the same time, multi-level early warning is completed through local reminders, vehicle instrument reporting, and synchronous uploading to the background server, so as to realize the early detection of 101 faults in the emergency call system, rather than passive failure when triggered in an emergency.

[0147] In some embodiments, such as Figure 8 As shown, the emergency call system 101 also includes a power supply module 801; the power supply module 801 includes a main power supply 8011 and a backup power supply 8012; the main power supply 8011 and the backup power supply 8012 are respectively connected to the control module 201 in communication.

[0148] Among them, the main power supply 8011 can be the vehicle's main 12V small battery (i.e., the vehicle's starting battery), and the backup power supply 8012 can be a nickel-metal hydride backup battery pack (built into the TBOX).

[0149] As a feasible implementation method, the control module 201 is also used to switch the current power supply from the main power supply 8011 to the backup power supply 8012 in the event of a failure of the main power supply 8011.

[0150] In an exemplary embodiment, the control module 201 acquires the output voltage of the main power supply 8011 in real time through a voltage sampling circuit. When the main power supply 8011 voltage is detected to be lower than a first preset voltage threshold (e.g., lower than 9V) or the main power supply 8011 is completely interrupted, the control module 201 determines that the main power supply 8011 is faulty. Subsequently, the control module 201 immediately performs a power switching operation: disconnecting the main power supply 8011 power supply circuit and activating the built-in nickel-metal hydride backup battery pack to provide continuous power support for the emergency call system 101.

[0151] For example, when the vehicle is running normally, it is powered by the main power supply 8011 and trickle-charges the backup battery; when the main power supply 8011 is unexpectedly interrupted after an accident, the power management circuit automatically switches to the backup power supply 8012 within a first preset switching time (e.g., 0.1 seconds); the backup power supply 8012 ensures that the system is continuously powered for no less than a first preset duration (e.g., 5 minutes), which is sufficient to complete calls, positioning and data reporting.

[0152] It should be understood that in the event of a serious collision, the main 12V battery and its power supply lines are highly susceptible to damage (e.g., battery casing cracking, wiring harness breakage), which may lead to an interruption or sudden voltage drop in the main power supply 8011. If the emergency call system 101 does not have an independent backup power supply 8012 at this time, it will be completely unable to function due to power loss, rescue requests cannot be sent, and the lives of the occupants will be seriously threatened. By using a built-in nickel-metal hydride backup battery pack, this technical solution can achieve millisecond-level power switching in the event of a main power supply 8011 failure, ensuring that the emergency call system 101's voice calls, location reporting, and communication links are not interrupted due to power failure, thereby significantly improving the reliability of the emergency call system 101 and the occupant safety protection capability.

[0153] In some embodiments, such as Figure 9 As shown, the emergency call system 101 also includes a detection chip 901; the detection chip 901 is communicatively connected to the backup power supply 8012 and the control module 201 respectively.

[0154] As a feasible implementation method, the detection chip 901 is used to collect the electrical characteristics of the backup power supply 8012; determine the state of charge and health status of the backup power supply 8012 based on the electrical characteristics; and send the state of charge and health status to the control module 201 when the state of charge and health status meet the warning conditions.

[0155] The warning conditions include at least one of the following: the state of charge is less than the preset safe state of charge limit, and the health status indication is less than the preset health status lower limit.

[0156] The preset safe charge state limit refers to the minimum remaining power percentage required to ensure that the backup power supply 8012 can support a complete emergency call (including voice call, location reporting and communication transmission).

[0157] For example, considering that emergency calls typically require at least 10 minutes of voice communication and multiple location data reports, the preset safe charge limit can be set to 10% or 15%. When the SOC is below this threshold, the backup power supply 8012 may not be able to support the entire emergency communication process, posing a risk of emergency failure.

[0158] The preset lower limit of health refers to the minimum percentage of health required to ensure that the backup power supply 8012 can charge and discharge normally and reliably output rated power when needed. State of health (SOH) is usually expressed as the ratio of the battery's current capacity to its nominal capacity.

[0159] Preferably, the preset lower limit of the battery health level can be set to 70% or 80%. When the state of health (SOH) is lower than this threshold, the battery's internal resistance increases, its capacity decays significantly, and it may experience a sudden drop in voltage, insufficient power supply time, or even sudden failure. Continued use poses a safety hazard.

[0160] It should be understood that SOC reflects the current remaining battery percentage and is a core indicator for determining whether the backup power supply 8012 can support emergency call missions. If the SOC is too low, even if the battery itself is healthy, it will not be able to provide enough energy to complete emergency communication. By setting an SOC warning threshold, the system can issue a maintenance reminder in advance when the backup power supply 8012 is low on power, avoiding system failure due to power depletion in an emergency.

[0161] State of Harshness (SOH) reflects the degree of aging of a battery after long-term use, including capacity decay and increased internal resistance. As the number of charge-discharge cycles increases, the performance of a nickel-metal hydride battery gradually declines. Even if the current State of Charge (SOC) shows 100%, an aging battery may experience a sudden voltage drop and an actual usable capacity far below the nominal capacity during actual discharge. By setting an SOH warning threshold, the system can remind the user to replace the backup power supply 8012 when the battery has aged to a certain extent, ensuring that the backup power supply 8012 is always in a reliable physical condition.

[0162] For example, the detection chip 901 collects voltage, current, and temperature data of the nickel-metal hydride backup battery at a preset frequency (e.g., once per second). Based on the collected data, the detection chip 901 estimates the battery's state of charge (SOC) in real time using a combination of coulomb integration (calculating the integral of the charging / discharging current over time) and open-circuit voltage lookup table method. Simultaneously, the detection chip 901 records the battery's full-cycle charging / discharging data and, combined with the battery's internal resistance measurement results, calculates the battery's state of health (SOH) using a preset decay model. When the SOC falls below a preset safe state of charge limit (e.g., 10%) or the SOH falls below a preset health level limit (e.g., 70%), the detection chip 901 sends an abnormal status flag and its specific value to the control module 201 via a communication interface (e.g., I2C or SPI).

[0163] As a feasible implementation method, the control module 201 is also used for early warning based on the state of charge and health status.

[0164] In the exemplary embodiment, when the control module 201 receives a warning message from the detection chip 901 indicating that the SOC is too low or the SOH is too low, the control module 201 executes a corresponding response strategy according to the severity of the warning: If the SOC is in the first preset range (e.g., 10%~20%) or the SOH is in the first preset range (e.g., 70%~80%), the control module 201 determines it as a level one fault (general), and executes the instrument panel text reminder and APP push alarm to prompt the owner to charge in time or pay attention to the battery status.

[0165] If the SOC is in the second preset range (e.g., 5%~10%) or the SOH is below the second preset threshold (e.g., 70%), the control module 201 determines it as a level two fault (severe), triggers an audible and visual alarm, and recommends that the user repair or replace the backup power supply 8012 as soon as possible.

[0166] If the SOC is lower than the third preset threshold (e.g., 5%) or the detection chip 901 reports severe battery aging or abnormally increased internal resistance, the control module 201 determines it to be a level three fault (fatal) and immediately reports the fault information to the rescue platform or maintenance center through the background server. At the same time, it ensures that the backup power supply 8012 is used first when an emergency call is triggered and informs the rescue center of the power status.

[0167] It should be understood that by using the detection chip 901 to monitor the SOC and SOH of the backup power supply 8012 in real time, and combining this with the hierarchical early warning mechanism of the control module 201, the emergency call system 101 can achieve intelligent management and control of the backup power supply 8012 throughout its entire lifecycle. This not only ensures the availability of the backup power supply 8012 at critical moments, but also provides OEMs, service stations, and vehicle owners with traceable and predictable maintenance data, avoiding the risk that emergency calls cannot be triggered due to the failure of the backup power supply 8012 itself, thereby further improving the overall reliability and safety of the system.

[0168] As a feasible implementation method, the backup power supply 8012 is charged through the main power supply 8011 during vehicle operation.

[0169] In an exemplary embodiment, during normal vehicle operation or engine running, the main power supply 8011 (the vehicle's main 12V small battery) continuously receives electrical energy replenishment through a generator or alternator. The control module 201 (or a dedicated power management chip) monitors the state of charge (SOC) of the backup power supply 8012 (NiMH backup battery pack) in real time. When the SOC of the backup power supply 8012 is detected to be lower than a first preset charging threshold (e.g., lower than 90% or 95%), the control module 201 controls the charging circuit to draw power from the main power supply 8011 and charge the backup power supply 8012 with a preset charging current (e.g., trickle charging mode, with the current preset to 0.1C to 0.2C). When the SOC of the backup power supply 8012 reaches a second preset charging threshold (e.g., reaching 100% or fully charged), the control module 201 automatically stops charging and enters a standby float charging state to prevent overcharging from damaging battery life.

[0170] For example, the charging management circuit adopts a constant current-constant voltage (CC-CV) charging strategy: when the backup power supply 8012 has a low charge level, a constant current charging mode is used to quickly replenish energy; when the voltage approaches the full charge threshold, it automatically switches to a constant voltage charging mode to trickle charge the battery with decreasing current, ensuring that the battery is fully charged without overcharging. Simultaneously, the control module 201 monitors the battery temperature in real time; when the temperature exceeds a preset temperature threshold (e.g., 45°C), it automatically reduces the charging current or pauses charging to ensure charging safety.

[0171] It should be understood that by charging the backup power supply 8012 through the main power supply 8011, the backup power supply 8012 is ensured to always be fully charged or at a high charge level, enabling it to reliably take over power supply in the event of a failure of the main power supply 8011. Simultaneously, the intelligent charging strategy (trichomon charging, constant current-constant voltage control, and temperature protection) effectively extends the lifespan of the backup power supply 8012, avoiding the risks of overcharging, over-discharging, and overheating. This solution ensures that the backup power supply 8012 is always on standby and readily available, providing reliable power redundancy for the emergency call system 101.

[0172] In some embodiments, such as Figure 10 As shown, the emergency call system 101 includes: a voice call module 202, a positioning module 501, a power supply module 801, a target voltage divider network 1010, and a control module 201.

[0173] The voice call module 202 includes: a first microphone 2021, a first speaker 2022, an audio codec module 2023, an audio power amplifier module 2024, a second microphone 2025, and a second speaker 2026.

[0174] The control module 201 includes: a control unit 2011, a control chip 2012, a first power management module 2013, a second power management module 2014, and a third power management module 2015. The control chip 2012 includes: a second microphone diagnostic module 2012a, a second speaker diagnostic module 2012b, a backup power diagnostic module 2012c, a satellite positioning and navigation antenna diagnostic module 2012d, and a cellular mobile communication antenna diagnostic module 2012e.

[0175] The positioning module 501 includes: a built-in multi-source satellite positioning and navigation antenna 5011, an external vehicle single-satellite positioning and navigation antenna 5012, an external vehicle multi-source satellite positioning and navigation antenna 5013, a main cellular mobile communication antenna 5014, a filter module 5015, and a backup cellular mobile communication antenna 5016. The built-in multi-source satellite positioning and navigation antenna 5011 can be mounted on the control chip 2012.

[0176] The power supply module 801 includes a main power supply 8011 and a backup power supply 8012.

[0177] The target voltage divider network 1010 includes: a first voltage divider network 1011 (including resistors R1, R2, and R3), a second voltage divider network 1012 (including resistors R4, R5, and R6), a third voltage divider network 1013 (including resistor R7), a fourth voltage divider network 1014 (including resistors R8, R9, and R10), and a fifth voltage divider network 1015 (including resistor R11).

[0178] It should be understood that the control unit 2011, the first microphone 2021, and the first speaker 2022 are built into the vehicle's cockpit domain controller (CDC); the control chip 2012, the first power management module 2013, the second power management module 2014, the third power management module 2015, the audio codec module 2023, the audio power amplifier module 2024, the filter module 5015, and the backup cellular mobile communication antenna 5016 are built into the vehicle's telematics box (TBOX).

[0179] For the voice call module 202: the main call link (first microphone 2021 and first speaker 2022) and the backup call link (second microphone 2025 and second speaker 2026) establish communication connections with the control unit 2011 respectively.

[0180] The audio codec module 2023 is connected between the second microphone 2025 and the audio power amplifier module 2024, and is used for audio data stream format conversion and transmission scheduling. Specifically, the audio codec module 2023 converts the analog voice signal collected by the second microphone 2025 into a digital signal for processing by the control module 201; at the same time, it converts the digital voice signal from the control module 201 into an analog signal, which is amplified by the audio power amplifier module 2024 and then drives the second speaker 2026 to emit sound.

[0181] Furthermore, the second microphone 2025 is connected to the first voltage divider network 1011 (resistors R1, R2, R3) in the target voltage divider network 1010; the second microphone diagnostic module 2012a performs fault diagnosis on the second microphone 2025 by sampling the voltage divider voltage in the first voltage divider network 1011 (e.g., determining whether it is open circuit, short circuit or functional abnormality).

[0182] The second speaker 2026 is connected to the second voltage divider network 1012 (resistors R4, R5, R6) in the target voltage divider network 1010; the second speaker diagnostic module 2012b performs fault diagnosis on the second speaker 2026 by sampling the voltage divider in the second voltage divider network 1012 (e.g., determining whether the voice coil is open-circuited, short-circuited, or has abnormal impedance).

[0183] The second microphone diagnostic module 2012a and the second speaker diagnostic module 2012b are both located in the control chip 2012 (e.g., 4G / 5G SOC) inside the TBOX, and together with the control unit 2011 (MCU or main control chip), they constitute the control module 201.

[0184] Regarding the positioning module 501: The built-in multi-source satellite positioning and navigation antenna 5011 can be installed on the control chip 2012. The built-in multi-mode satellite positioning module 501 is integrated inside the control chip 2012 to achieve rapid acquisition, tracking, and positioning calculation of satellite signals from multiple systems (such as BeiDou, GPS, GLONASS, etc.).

[0185] The receiving module corresponding to the external single-satellite positioning and navigation antenna receives BeiDou satellite signals through an independent antenna, serving as a high-precision backup and enhancement data source, and providing reliable single BeiDou positioning capability when the main positioning link fails.

[0186] Furthermore, the vehicle's external single satellite positioning and navigation antenna 5012 is connected to the third voltage divider network 1013 (resistor R7) in the target voltage divider network 1010; the satellite positioning and navigation antenna diagnostic module 2012d uses the voltage difference across resistor R7 in the third voltage divider network 1013 via AD retrieval (analog-to-digital conversion retrieval) to determine whether the external single satellite positioning and navigation antenna is detached, open-circuited, or short-circuited based on the change in voltage difference, thereby achieving real-time diagnosis of the antenna's in-situ status.

[0187] Specifically: when the antenna is properly connected and in place, the voltage difference across R7 is within the first preset voltage difference range (e.g., the normal range); when the antenna is detached or open-circuited, the circuit is broken, and the voltage difference across R7 approaches zero or is within the second preset voltage difference range; when the antenna is short-circuited, the voltage difference across R7 is within the third preset voltage difference range (e.g., the voltage difference increases abnormally).

[0188] The main cellular mobile communication antenna 5014 is connected to the fourth voltage divider network 1014 (resistors R8, R9, R10) in the target voltage divider network 1010. The cellular mobile communication antenna diagnostic module 2012e (integrated in the control chip 2012) diagnoses whether the main cellular mobile communication antenna 5014 is faulty (e.g., open circuit, short circuit, or impedance mismatch) by real-time sampling of the voltage divider voltage of the fourth voltage divider network 1014. When the main cellular mobile communication antenna 5014 is determined to be faulty, the control module 201 switches the communication link to the built-in backup cellular mobile communication antenna 5016 (i.e., backup 4G antenna) through the SAW (Surface Acoustic Wave) filter module 5015, ensuring continuous system network access and uninterrupted emergency communication capabilities.

[0189] Regarding the power supply module 801: In the power supply module 801, the first power supply management module 2013 is electrically connected to the control chip 2012, and is used to provide stable voltage conversion and power management for the control chip 2012 and the positioning module 501 in the main power supply scenario 8011; the second power supply management module 2014 is electrically connected to the vehicle external multi-source satellite positioning and navigation antenna 5013 and the control chip 2012 respectively, and is used to provide independent and stable power support for the external multi-source satellite positioning and navigation antenna and the control chip 2012 in the backup power supply scenario 8012.

[0190] The power control unit (which can be implemented in collaboration between the first power management module 2013 and the second power management module 2014) provides stable power to the built-in and external positioning modules 501 respectively, ensuring the normal operation of each module under different power conditions.

[0191] The main power supply 8011 serves as the main and backup power input source, providing basic power protection for the emergency call system 101. The backup power supply 8012 is managed for charging and discharging through the control module 201 and the third power supply management module 2015 (charging IC3). As an emergency backup power supply 8012, it takes over the power supply task when the main power supply 8011 fails.

[0192] The feedback component (including resistor R11 and voltage sampling circuit in the fifth voltage divider network 1015) collects battery voltage and charging / discharging status (including charging current, discharging current, battery terminal voltage and temperature, etc.) in real time, and uploads the collected data to the backup power diagnostic module 2012c in the control chip 2012 to realize intelligent switching between main and backup power and overcharge and over-discharge protection.

[0193] It should be understood that by using the target voltage divider network 1010 to collect real-time voltage data and perform status diagnostics on each external device, faults can be detected in advance rather than passively exposed. Voice, positioning, communication, and power supply are all configured with redundant primary and backup links, ensuring that a single point of failure does not affect the overall system functionality. The control module 201 automatically triggers link switching based on diagnostic results, ensuring that emergency calls can still be initiated and continue operating normally even in extreme scenarios. Through tiered fault warnings and intelligent power management, the vehicle's emergency communication capabilities and occupant safety levels are significantly improved in accident scenarios.

[0194] In some embodiments, the emergency call method provided in this application can be applied to the control module of the above-mentioned emergency call system. The emergency call method may specifically include the following steps: when there is an emergency call demand and the main call link fails, the current call link is switched to the backup call link so as to make an emergency call through the backup call link.

[0195] As a feasible implementation method, during an emergency call, it is determined whether the primary positioning link meets the preset positioning conditions. If the primary positioning link meets the preset positioning conditions, the current positioning link is switched from the primary positioning link to the backup positioning link to determine the positioning location and send the positioning location. Among these methods, the positioning accuracy of the primary positioning link is less than the preset accuracy when the preset positioning conditions are met.

[0196] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. The electronic device 1100 may include a processor 1101 and a memory 1102. The processor 1101 and the memory 1102 are communicatively connected. The memory 1102 is used to store programs, and the processor 1101 is used to execute the programs, specifically performing the relevant steps described above in the emergency call method embodiment.

[0197] Specifically, the program may include program code, which includes computer-executable instructions. Memory 1102 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device. Processor 1101 may be a central processing unit (CPU), a microcontroller unit (MCU), or an application-specific integrated circuit (ASIC).

[0198] This application also provides a computer-readable storage medium storing at least one executable instruction that, when executed on an emergency call device, causes the emergency call device to perform the emergency call method in any of the above method embodiments.

[0199] This application provides a computer program product that can be executed by the processor 1101 of the electronic device 1100 to perform the emergency call method in the above embodiments.

[0200] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. An emergency call system, characterized in that, The emergency call system includes a control module and a voice call module; the voice call module includes a primary call link and a backup call link; the control module is communicatively connected to the primary call link and the backup call link respectively; The control module is used to switch the current call link to the backup call link when there is an emergency call requirement and the main call link fails, so as to make an emergency call through the backup call link.

2. The emergency call system according to claim 1, characterized in that, The emergency call system further includes a positioning module; the positioning module includes a primary positioning link and a backup positioning link; the control module is communicatively connected to the primary positioning link and the backup positioning link respectively; The control module is also used to determine whether the primary positioning link meets the preset positioning conditions during an emergency call; if the primary positioning link meets the preset positioning conditions, the current positioning link is switched from the primary positioning link to the backup positioning link, so as to determine the positioning location through the backup positioning link and send out the positioning location; wherein, when the primary positioning link meets the preset positioning conditions, the positioning accuracy is less than the preset accuracy.

3. The emergency call system according to claim 1, characterized in that, The control module includes: a voice link detection unit and a first switching unit; the voice link detection unit and the first switching unit are communicatively connected. The voice link detection unit is used to perform communication detection on the main call link and send the communication detection result to the first switching unit; The first switching unit is used to determine whether the primary call link meets the call link failure determination conditions based on the communication detection results; if the primary call link meets the call link failure determination conditions, the primary call link is determined to be faulty, and the current call link is switched from the primary call link to the backup call link.

4. The emergency call system according to claim 3, characterized in that, The call link failure determination criteria include at least one of the following: The main call link has audio missing, the main call link did not receive a response after the emergency call was made, and the audio amplitude of the main call link is not within the standard audio amplitude range.

5. The emergency call system according to claim 2, characterized in that, The primary positioning link is a multi-source fusion positioning link; the backup positioning link is a single positioning device positioning link.

6. The emergency call system according to claim 5, characterized in that, The multi-source fusion positioning link includes: a first global satellite navigation and positioning system, a second global satellite positioning system, and a cellular mobile communication system-on-a-chip; the first global satellite navigation and positioning system and the second global satellite positioning system are respectively communicatively connected to the cellular mobile communication system-on-a-chip. The preset positioning conditions include at least one of the following: The number of available satellites in the first global satellite navigation and / or the second global satellite positioning system is less than a preset number; The positioning error between the first global satellite navigation and positioning system and the second global satellite positioning system is greater than a preset error; The communication between the cellular mobile communication system chip and the first global satellite navigation and / or the second global satellite positioning system is interrupted.

7. The emergency call system according to claim 6, characterized in that, The positioning module further includes: a primary cellular mobile communication antenna and a backup cellular mobile communication antenna; The control module is also used to switch the antenna currently receiving base station signals from the main cellular mobile communication antenna to the backup cellular mobile communication antenna in the event of failure of the main cellular mobile communication antenna; the main cellular mobile communication antenna is an external 4G or 5G antenna in the vehicle; the backup cellular mobile communication antenna is a 4G antenna built into the vehicle.

8. The emergency call system according to claim 2, characterized in that, The positioning module further includes: a satellite positioning and navigation antenna and a main cellular mobile communication antenna; the backup call link includes: a call device; the emergency call system further includes: a target voltage divider network; the target voltage divider network is communicatively connected to the control module; The target voltage divider network is used to acquire voltage from the target device, obtain the acquired voltage, and send the acquired voltage to the control module; the target device is the satellite positioning and navigation antenna, the main cellular mobile communication antenna, and the calling device externally mounted in the vehicle. The control module is also used to perform fault detection on the target device based on the acquired voltage.

9. The emergency call system according to any one of claims 1-8, characterized in that, The emergency call system further includes a power supply module; the power supply module includes a main power supply and a backup power supply; the main power supply and the backup power supply are respectively communicatively connected to the control module. The control module is also used to switch the current power supply from the main power supply to the backup power supply in the event of a main power supply failure.

10. The emergency call system according to claim 9, characterized in that, The emergency call system further includes a detection chip; the detection chip is communicatively connected to the backup power supply and the control module respectively. The detection chip is used to collect the electrical characteristics of the backup power supply; determine the state of charge and health status of the backup power supply based on the electrical characteristics; and send the state of charge and health status to the control module when the state of charge and health status meet the warning conditions; the warning conditions include at least one of the following: the state of charge is less than a preset safe state of charge limit, and the health status indicated by the health status is less than a preset lower limit of health status. The control module is also used to provide early warnings based on the state of charge and the health status.

11. The emergency call system according to claim 10, characterized in that, The backup power supply is charged by the main power supply during vehicle operation.

12. The emergency call system according to claim 1, characterized in that, The control module is also used to make an emergency call through the main call link when there is an emergency call requirement and the main call link is fault-free.

13. An emergency call method, characterized in that, A controller applied to the emergency call system as described in claim 1; The emergency call method includes: In the event of an emergency call requirement and a failure of the primary call link, the current call link is switched to the backup call link to make the emergency call.

14. The emergency call method according to claim 13, characterized in that, The emergency call system further includes: a positioning module; the positioning module includes: a primary positioning link and a backup positioning link; the control module is communicatively connected to the primary positioning link and the backup positioning link respectively; the emergency call method further includes: During an emergency call, it is determined whether the primary positioning link meets the preset positioning conditions. If the primary positioning link meets the preset positioning conditions, the current positioning link is switched from the primary positioning link to the backup positioning link to determine the positioning location through the backup positioning link and send out the positioning location. Wherein, when the primary positioning link meets the preset positioning conditions, the positioning accuracy is less than the preset accuracy.

15. A vehicle, characterized in that, include: The emergency call system as described in any one of claims 1-12.

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