A breath-synchronized intelligent vehicle-mounted oxygen supply control method and system

Abstract

The application relates to the technical field of intelligent vehicle-mounted technology, in particular to a breathing synchronization intelligent vehicle-mounted oxygen supply control method and system, which comprises the following steps: emitting electromagnetic waves to passengers through a millimeter wave radar and receiving reflected echo signals; performing signal processing on the reflected echo signals to obtain periodic signal waveforms; identifying the inspiration stage and the expiration stage of the passengers based on the periodic signal waveforms; outputting an opening instruction in response to the identification of the inspiration stage; outputting a closing instruction in response to the identification of the expiration stage; and based on the analysis of the periodic signal waveforms formed by the passengers in a plurality of historical breathing cycles, predicting the starting moment of the next inspiration stage and outputting the opening instruction at a preset time point before the predicted starting moment of the inspiration stage. The oxygen utilization rate is greatly improved, so that a smaller-power oxygen generator or a smaller-capacity oxygen storage tank can be used under the condition of the same effective oxygen uptake, thereby reducing the system volume, weight, cost and energy consumption.

Description

Technical Field

[0001] This application relates to the field of intelligent vehicle technology, and in particular to a breathing-synchronized intelligent vehicle oxygen supply control method and system. Background Technology

[0002] Currently, most in-vehicle oxygen supply systems use a continuous low-flow oxygen supply method. These systems continue to deliver oxygen even when occupants exhale or hold their breath, resulting in over 50% of the oxygen being lost without being effectively inhaled, leading to low oxygen utilization. To compensate for this insufficient effective oxygen intake, the system must be equipped with an oxygen generator with higher oxygen production capacity or a larger capacity oxygen tank, significantly increasing the size, weight, energy consumption, and cost of the device, which is detrimental to vehicle lightweighting and energy-saving design. Furthermore, the continuous airflow blowing directly onto the mouth and nose area can easily cause dry skin and discomfort for occupants, and the accompanying airflow noise also affects the quietness of the vehicle interior.

[0003] Some of the improved solutions use timed, periodic pulse oxygen supply, but the pulse frequency is fixed and fails to synchronize with the actual breathing rate of the individual occupants in real time. There is still a mismatch between the timing of oxygen supply and the inhalation action, which limits the improvement of oxygen utilization efficiency.

[0004] Therefore, the industry urgently needs an on-board oxygen supply control technology that can provide precise, non-contact, and on-demand oxygen supply. Summary of the Invention

[0005] The objective of this application is to provide a breathing-synchronized intelligent vehicle oxygen supply control method, comprising: transmitting electromagnetic waves to an occupant via millimeter-wave radar and receiving reflected echo signals caused by the occupant's breathing movements; processing the reflected echo signals to obtain a periodic signal waveform characterizing the occupant's breathing state; identifying the occupant's inhalation and exhalation phases based on the periodic signal waveform; in response to identifying the inhalation phase, outputting an opening command to a solenoid valve located at the oxygen supply end to supply oxygen to the occupant; and in response to identifying the exhalation phase, outputting a closing command to the solenoid valve to stop supplying oxygen to the occupant; wherein, the method further comprises: predicting the start time of the next inhalation phase based on the analysis of the periodic signal waveforms formed by the occupant in multiple historical breathing cycles, and outputting the opening command at a preset time point before the predicted start time of the inhalation phase to compensate for the response delay of the solenoid valve.

[0006] By adopting the above technical solution, since oxygen supply is precisely executed only during the inhalation phase, almost all released oxygen is effectively inhaled, significantly improving oxygen utilization. This increased efficiency allows for the use of smaller-power oxygen generators or smaller-capacity oxygen tanks under the same effective oxygen intake conditions, thereby reducing system size, weight, cost, and energy consumption. The system operates fully automatically, adapting to changes in the occupant's breathing rhythm, exhibiting a high degree of intelligence. Furthermore, by analyzing multiple historical cycles to predict the start of the next inhalation, it can effectively compensate for the mechanical response delay of the solenoid valve, allowing for early oxygen supply so that the oxygen-rich flow reaches the mouth and nose area the instant the occupant begins inhalation, improving oxygen uptake efficiency in the initial stage of inhalation and optimizing the timeliness of pulmonary gas exchange.

[0007] Optionally, the signal processing of the reflected echo signal includes: filtering the reflected echo signal using a bandpass filter to filter out low-frequency interference signals with frequencies below a first preset threshold and high-frequency interference signals with frequencies above a second preset threshold, wherein the low-frequency interference signals include signals caused by the slow movement of the occupant's body, and the high-frequency interference signals include signals caused by vehicle vibration.

[0008] By adopting the above technical solution, low-frequency body drift signals and high-frequency vehicle vibration signals are filtered out by bandpass filters, eliminating the main sources of interference in the vehicle environment, ensuring the accuracy of subsequent breathing phase recognition, avoiding false triggering of oxygen supply due to vibration or large movements, and improving the reliability of the system under driving conditions.

[0009] Optionally, obtaining the periodic signal waveform characterizing the occupant's breathing state includes: performing phase demodulation on the reflected echo signal and extracting a breathing waveform that approximates a sine wave with the occupant's breathing motion from the phase change.

[0010] By adopting the above technical solution and using the phase demodulation method to extract the respiratory waveform from the radar echo, it is possible to effectively sense the minute displacement (millimeter level) of the chest / abdominal cavity. The obtained approximate sinusoidal waveform has a direct physiological correspondence with respiratory movement.

[0011] Optionally, identifying the occupant's inhalation and exhalation phases based on the periodic signal waveform includes: detecting rising and falling segments in the periodic signal waveform, identifying the rising segment as the inhalation phase, and identifying the falling segment as the exhalation phase.

[0012] By adopting the above technical solution, the rising segment of the waveform is mapped to inhalation and the falling segment to exhalation. This is a discrimination logic that directly conforms to the chest cavity expansion / contraction mechanism. It is simple to implement, highly real-time, and ensures the accurate operation of the oxygen supply valve in each respiratory cycle.

[0013] Optionally, the preset time point is 50-80 milliseconds.

[0014] By adopting the above technical solution, and taking the advance time as a value of 50-80 milliseconds as determined by experiments, it is possible to achieve precise alignment between the arrival of airflow and the start of intake, under the response speed of general vehicle solenoid valves, thus avoiding waste caused by premature oxygen supply or reduced initial efficiency due to delayed oxygen supply.

[0015] Optionally, the millimeter-wave radar is installed in the seat back, B-pillar, or headliner of the vehicle, the solenoid valve is located inside the headrest of the vehicle seat, and the oxygen supply terminal is a diffuse oxygen outlet.

[0016] By adopting the above technical solutions, millimeter-wave radar is installed in the seat back, B-pillar, or roof lining, ensuring continuous non-contact monitoring of the occupant's torso without occupying activity space; the solenoid valve and diffused oxygen outlet are integrated into the headrest, making the oxygen supply components invisible, which is both aesthetically pleasing and avoids the safety hazards caused by exposed pipelines. At the same time, the diffused oxygen can diffuse gently, further improving comfort.

[0017] Optionally, the millimeter-wave radar operates in a frequency band of 60 GHz, 77 GHz, or 79 GHz, and the beam range of the millimeter-wave radar covers the torso of a single occupant.

[0018] By adopting the above technical solutions and using the 60GHz, 77GHz or 79GHz millimeter wave bands, it has high distance resolution and anti-interference capabilities, and can sense chest displacement at the micrometer to millimeter level; the beam is limited to cover the torso of a single occupant, avoiding crosstalk of respiratory signals from nearby passengers and ensuring the independence of oxygen supply control.

[0019] The second objective of this application is to provide a breathing-synchronized intelligent vehicle oxygen supply control system, comprising: a non-contact breathing detection unit for transmitting electromagnetic waves to an occupant and receiving reflected echo signals caused by the occupant's breathing movements, the non-contact breathing detection unit including millimeter-wave radar; a central control unit electrically connected to the non-contact breathing detection unit, configured to: perform signal processing on the reflected echo signals to obtain a periodic signal waveform characterizing the occupant's breathing state; identify the occupant's inhalation and exhalation phases based on the periodic signal waveform; generate an activation command in response to the detection of the inhalation phase; generate a deactivation command in response to the detection of the exhalation phase; and pre-activate the system. The measurement and compensation unit, based on the analysis of the periodic signal waveforms formed by the occupant in multiple historical respiratory cycles, predicts the start time of the next inhalation phase and outputs the opening command at a preset time point before the predicted start time of the inhalation phase to compensate for the response delay of the solenoid valve; the gas delivery and control unit includes a solenoid valve at the oxygen supply end and an oxygen outlet, the solenoid valve being electrically connected to the central control unit and configured to open according to the opening command to supply oxygen to the occupant, and close according to the closing command to stop supplying oxygen; and an oxygen generation or storage unit, fluidly connected to the gas delivery and control unit, for providing the oxygen. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the breathing-synchronized intelligent vehicle oxygen supply control method of this application.

[0021] Figure 2 This is a block diagram of the intelligent vehicle-mounted oxygen supply control system for respiratory synchronization in this application. Detailed Implementation

[0022] In the research and deployment of vehicle-mounted oxygen supply systems, the industry has long focused on improving the oxygen production capacity of oxygen generators, increasing the capacity of oxygen storage devices, and optimizing the layout of oxygen supply pipelines. Under this technological inertia, a consistently overlooked fact is that regardless of the system's oxygen production capacity or storage capacity, if oxygen is continuously released when occupants are not inhaling it, a significant proportion of the oxygen does not actually enter the human respiratory system but instead dissipates into the vehicle's air. More than half of the oxygen is wasted during exhalation and breath-holding. To compensate for this efficiency gap, the system can only increase oxygen production capacity and storage capacity, which in turn increases the overall size, weight, and energy consumption of the device, conflicting with the engineering goals of vehicle lightweighting and energy conservation.

[0023] Although the concept of pulsed oxygen supply has been proposed in existing technologies, the pulse frequency is not synchronized with the actual breathing rhythm of the occupants in real time, and the time mismatch between oxygen supply and inhalation still exists, resulting in limited substantial improvement in oxygen utilization efficiency.

[0024] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown in the figure, this application discloses a method for controlling synchronized respiratory oxygen supply, including: transmitting electromagnetic waves to an occupant via millimeter-wave radar and receiving reflected echo signals caused by the occupant's respiratory movements; processing the reflected echo signals to obtain a periodic signal waveform characterizing the occupant's respiratory state; identifying the occupant's inhalation and exhalation phases based on the periodic signal waveform; in response to identifying the inhalation phase, outputting an opening command to a solenoid valve located at the end of the oxygen supply to supply oxygen to the occupant; in response to identifying the exhalation phase, outputting a closing command to the solenoid valve to stop supplying oxygen to the occupant; wherein, it further includes: predicting the start time of the next inhalation phase based on the analysis of the periodic signal waveforms formed by the occupant in multiple historical respiratory cycles, and outputting an opening command at a preset time point before the predicted start time of the inhalation phase to compensate for the response delay of the solenoid valve.

[0026] It is understandable that millimeter-wave radar continuously emits electromagnetic waves towards the target occupant inside the vehicle. After these electromagnetic waves irradiate the occupant's torso area, the occupant's breathing movements cause periodic, minute fluctuations in the chest and abdominal cavities, resulting in corresponding changes in the reflected echo signal. These changes carry information directly related to the occupant's breathing movements. After receiving the reflected echo signal, the millimeter-wave radar uses it as the raw input for subsequent signal processing.

[0027] The choice of installation location for millimeter-wave radar may affect its detection effect on occupant breathing movements. Seat backrests, B-pillars, or headliners are all existing structural locations within the vehicle. Installing millimeter-wave radar in these locations allows the radar beam to cover the torso area of ​​the target occupant at an appropriate angle and distance, enabling continuous and stable monitoring of chest or abdominal respiratory displacement. At the same time, these installation locations do not occupy the occupant's seating and activity space, and do not affect the original layout and user experience of the vehicle.

[0028] The solenoid valve is located inside the vehicle seat headrest, placing the oxygen supply actuator close to the occupant's mouth and nose area. Because the solenoid valve is at the end of the oxygen supply chain, the air path from valve opening to oxygen release from the outlet is extremely short. This helps reduce airflow delay and improves the responsiveness of oxygen supply control. Integrating the solenoid valve and oxygen outlet inside the headrest also allows the oxygen supply components to be visually concealed within the seat structure. Airway lines can be routed within the seat, avoiding the safety hazards and visual clutter caused by exposed lines, thus balancing aesthetics and safety.

[0029] The oxygen supply terminal uses a diffused oxygen outlet to release oxygen in a gentle and dispersed manner. The diffused oxygen outlet can make the oxygen relatively evenly distributed in the mouth and nose area of ​​the occupants, avoiding the local discomfort caused by direct airflow.

[0030] It should be noted that the "reflected echo signal caused by respiratory movements" mentioned here is physically based on the following: during inhalation, the thoracic cavity expands, the diaphragm descends, and the anterior surface of the trunk undergoes a slight outward displacement; during exhalation, the thoracic cavity recoils, the diaphragm rises, and the anterior surface of the trunk undergoes a slight inward displacement. This displacement amplitude is typically on the order of millimeters, and millimeter-wave radar can effectively detect displacement changes of this magnitude and reflect them in changes in parameters such as the phase and frequency of the echo signal.

[0031] Signal processing of reflected echo signals involves extracting periodic signal waveforms that change over time and whose variation pattern corresponds to the occupant's breathing cycle. This can be achieved using a combination of one or more processing methods, including but not limited to filtering, demodulation, and transformation. The specific signal processing method can be selected based on actual engineering requirements.

[0032] In this embodiment of the application, signal processing of the reflected echo signal includes: filtering the reflected echo signal using a bandpass filter to filter out low-frequency interference signals with frequencies lower than a first preset threshold and high-frequency interference signals with frequencies higher than a second preset threshold, wherein the low-frequency interference signals include signals caused by the slow movement of the occupant's body, and the high-frequency interference signals include signals caused by vehicle vibration.

[0033] In actual vehicle environments, the reflected echo signals received by millimeter-wave radar not only contain the effective signal components caused by the breathing movements of occupants, but also inevitably mix in various interference signals. If these interference signals are not effectively filtered out, they will contaminate the subsequently extracted periodic signal waveforms, thereby affecting the accuracy of breathing phase recognition and causing false triggering or missed triggering of the solenoid valve.

[0034] In this embodiment, the interference sources identified in the vehicle environment include low-frequency interference signals and high-frequency interference signals. Low-frequency interference signals are slow movements of the occupant's body, such as adjusting the occupant's posture, turning the body, raising the hand, etc., which are large but low-frequency limb movements. These movements will cause low-frequency components in the radar echo signal, and their frequency range is usually significantly lower than the frequency band of the normal human breathing frequency. High-frequency interference signals are vibrations generated during vehicle operation, including engine vibration, body vibration caused by uneven road surface, etc. These vibrations are transmitted to the installation position of the millimeter-wave radar through the vehicle structure, or indirectly enter the radar echo by affecting the overall micro-movement of the occupant's body. In the echo signal, they are manifested as high-frequency components, and their frequency range is usually significantly higher than the frequency band of the normal human breathing frequency.

[0035] Using a bandpass filter to filter reflected echo signals involves leveraging its frequency selectivity to allow only signal components whose frequencies fall within the passband defined by a first and a second preset threshold to pass through. Low-frequency interference signals below the first preset threshold and high-frequency interference signals above the second preset threshold are attenuated or filtered out. The specific values ​​of the first and second preset thresholds can be determined during engineering implementation based on factors such as the statistical range of normal human breathing frequency, radar installation location, and vehicle vibration characteristics, ensuring that the frequency band of the human breathing signal falls precisely within the passband.

[0036] It is understandable that obtaining a periodic signal waveform that characterizes the occupant's breathing state includes: performing phase demodulation on the reflected echo signal and extracting a breathing waveform that approximates a sine wave with the occupant's breathing motion from the phase change.

[0037] When the electromagnetic waves emitted by the millimeter-wave radar irradiate the surface of the occupant's torso, they are reflected back. Due to the periodic small displacements in the chest or abdominal cavity caused by the occupant's breathing, the phase difference between the reflected echo and the emitted wave also changes periodically. The purpose of phase demodulation is to extract this phase change hidden in the reflected echo signal and convert it into a time-domain waveform that can directly characterize respiratory motion.

[0038] From a physical perspective, during inhalation, the chest cavity expands outward, slightly reducing the distance between the radar and the occupant's torso, causing the phase of the reflected echo to shift in one direction. During exhalation, the chest cavity contracts, slightly increasing the distance, and the phase shifts in the opposite direction. In a complete respiratory cycle, the phase undergoes a complete back-and-forth change. This phase change trajectory unfolds on the time axis, forming a waveform directly corresponding to the respiratory motion. Since the chest cavity movement during natural human breathing is approximately a smooth reciprocating motion, the respiratory waveform extracted through phase demodulation also exhibits an approximately sinusoidal characteristic in shape. The waveform period corresponds to the length of a complete breath of the occupant, the peaks and troughs of the waveform correspond to the transition points between inhalation and exhalation, and the rising and falling segments of the waveform form a stable temporal correspondence with the inhalation and exhalation processes, respectively.

[0039] In this embodiment of the application, the identification of the occupant's inhalation and exhalation phases based on the periodic signal waveform includes: detecting the rising segment and the falling segment in the periodic signal waveform, identifying the rising segment as the inhalation phase, and identifying the falling segment as the exhalation phase.

[0040] During natural breathing, inhalation is accompanied by the active expansion of the chest cavity, which is represented by the signal value climbing from a lower level to a higher level on a periodic signal waveform, i.e., the rising segment of the waveform; exhalation is accompanied by the passive recoil of the chest cavity, which is represented by the signal value falling from a higher level to a lower level on the waveform, i.e., the falling segment of the waveform.

[0041] Therefore, detecting the rising and falling segments of the waveform and mapping the rising segment to the inhalation phase and the falling segment to the exhalation phase constitutes a discrimination logic that directly conforms to physiological reality. The "rising segment" and "falling segment" can be determined by combining the sign of the derivative of the actual waveform, the direction of the difference between adjacent sampling points, or the direction between local extrema of the waveform. For example, when the waveform is detected to be evolving from a local minimum to a local maximum, the system determines that the current phase is inhalation; when the waveform is detected to be evolving from a local maximum to a local minimum, the system determines that the current phase is exhalation.

[0042] This discrimination method does not rely on complex pattern recognition or training models, has a low computational burden, high real-time performance, and can be seamlessly integrated with front-end signal filtering and phase demodulation. During the rising phase of a respiratory cycle, the system can continuously output an open command to maintain oxygen supply, and during the falling phase, it can continuously output a close command to stop oxygen supply, thus ensuring that the solenoid valve's action accurately switches according to the changes in respiratory phase in each respiratory cycle. When the waveform reaches a local extreme point, corresponding to the instant of transition from inhalation to exhalation or vice versa, the system can reverse the valve state accordingly.

[0043] The solenoid valve responds to the activation command issued upon detecting the inhalation phase and to the deactivation command issued upon detecting the exhalation phase. "Responds to" here indicates a triggering relationship; the detection result of the respiratory phase directly serves as the decision-making basis for the solenoid valve's action. Located at the end of the oxygen supply line, the solenoid valve is the final control node for oxygen flow from the tubing into the occupant's breathing area. When inhalation is detected, the activation command opens the solenoid valve, releasing oxygen for the occupant to inhale. When exhalation is detected, the deactivation command closes the solenoid valve, immediately stopping the oxygen supply. Thus, the entire oxygen supply process follows the occupant's own breathing rhythm on the timeline. Oxygen is only released when the occupant needs to inhale; the tubing remains closed during the remaining time, fundamentally avoiding unnecessary oxygen loss during exhalation and breath-holding in continuous oxygen supply mode.

[0044] In this embodiment, almost all of the released oxygen is effectively inhaled by the occupants, and the oxygen utilization rate is greatly improved. Due to the improved efficiency, the system can use an oxygen generator with a smaller oxygen production capacity or a smaller oxygen storage tank while meeting the same effective oxygen intake requirements. This helps to reduce the overall size, weight, cost and energy consumption of the vehicle oxygen supply device. The entire process is fully automatic and does not require any operation by the occupants. The system can adapt to the changes in breathing rhythm of different occupants in different states.

[0045] Understandably, while human respiration may vary over longer timescales due to factors such as activity level and emotions, within shorter time windows, several consecutive respiratory cycles often exhibit a certain regularity and stability in terms of duration and rhythm. Utilizing this characteristic, the system can continuously record waveform data from multiple completed historical respiratory cycles, extracting features related to respiratory rhythm, such as the duration of each cycle, the proportion of time spent in the inspiratory phase within the entire cycle, and the rate of change of the waveform from its starting point to its peak.

[0046] By analyzing this historical information, the system can make a prediction about when the next inhalation phase will begin. This prediction is based on the dynamic calculation of the occupant's recent actual respiratory rhythm. When the occupant's breathing rhythm gradually speeds up or slows down due to changes in state, the analysis results of the historical respiratory cycle will also be updated accordingly, and the predicted output will adaptively follow the changes in respiratory rhythm.

[0047] It should be noted that the analysis of periodic signal waveforms formed by multiple historical respiratory cycles can be implemented in various ways, such as by using a moving average based on the duration of the previous few cycles or by analyzing the autocorrelation characteristics of the waveform. The specific analysis method can be selected according to engineering requirements. This provides a time reference for subsequent pre-oxygen supply control, enabling the system to issue an activation command before the actual start of inspiration. This compensates for the delays introduced by signal transmission, solenoid valve mechanical action, etc., ensuring that the oxygen flow reaches the occupant's mouth and nose area at the start of inspiration.

[0048] In the embodiments of this application, the solenoid valve, as an electromechanical actuator, has an inherent response delay from receiving the electrical signal of the opening command to the valve core completing the mechanical action and the air passage being fully opened. Although the magnitude of this delay is small, in application scenarios such as synchronized breathing oxygen supply where timing requirements are strict, if it is not compensated, the actual time when oxygen begins to flow out will lag behind the time when the occupant begins to inhale, resulting in a decrease in gas exchange efficiency in the initial stage of inhalation.

[0049] To address this issue, this embodiment outputs an opening command a preset time point in advance, based on the predicted start time of the next inhalation. This advance amount corresponds to the response delay required for the solenoid valve to complete its opening action from receiving the command. By issuing the command in advance, the opening action of the solenoid valve is aligned with the start of the occupant's inhalation on the timeline. When the occupant's lungs actually begin inhaling, the solenoid valve has already opened, oxygen has reached the oxygen outlet and begun to diffuse towards the occupant's mouth and nose area, and the first breath inhaled by the occupant is oxygen-enriched gas.

[0050] The specific value of the preset time point can be determined by comprehensively setting factors such as the response characteristic parameters of the selected solenoid valve, the delay of the control signal transmission link, and the length of the air path, so as to achieve alignment between the arrival time of the airflow and the start time of inhalation under typical operating conditions. Different models and specifications of solenoid valves may have different response delays; therefore, the preset time point can be adapted according to the measured characteristics of the selected components during implementation. This prevents oxygen from flowing out before inhalation begins due to an early command, thus avoiding waste, and also prevents the initial inhalation stage from being filled with ordinary air from the carriage, reducing the timeliness and efficiency of gas exchange in the lungs due to an late command.

[0051] Understandably, when the preset time point is 50-80 milliseconds, the opening command is issued 50-80 milliseconds before the predicted start of inhalation. This gives the solenoid valve 50-80 milliseconds to complete the mechanical action from receiving the command to the valve being fully opened. This value matches the typical response speed of the solenoid valves used in current vehicle oxygen supply systems, enabling precise alignment of airflow reaching the occupant's mouth and nose area with the start of inhalation in most vehicle application scenarios.

[0052] It is understandable that 60GHz, 77GHz, or 79GHz all belong to the millimeter wave band. Electromagnetic waves in this band have shorter wavelengths, enabling highly sensitive sensing of minute displacements. For millimeter-level displacement changes in the chest or abdominal cavity caused by human respiration, when the radar operates in the above frequency bands, the phase change of the reflected echo is more significant. This is beneficial for extracting high-quality, high signal-to-noise ratio respiratory waveforms from the echo signals.

[0053] Simultaneously, the beam range covers the torso of a single occupant, concentrating electromagnetic energy primarily on the torso area of ​​that individual occupant while minimizing illumination of the torso areas of other adjacent occupants. In multi-occupant scenarios, if the radar beam simultaneously covers occupants in adjacent seats, the received echo signal may be mixed with signal components caused by the breathing movements of others, resulting in signal crosstalk and interfering with the accurate determination of the target occupant's breathing phase. By limiting the beam range to cover the torso of a single occupant, this cross-occupant signal crosstalk can be effectively suppressed, ensuring independent oxygen supply control for each seat and personalized oxygen supply based on the individual occupant's breathing rhythm, unaffected by the breathing characteristics of neighboring occupants. In practical implementation, the beam range can be limited through antenna beamforming design and adjustments to the radar's installation position and pointing angle.

[0054] like Figure 2 As shown, this application also discloses a breathing-synchronized intelligent oxygen supply system, comprising: a non-contact breathing detection unit for transmitting electromagnetic waves to the occupant and receiving reflected echo signals caused by the occupant's breathing movements, the non-contact breathing detection unit including millimeter-wave radar; and a central control unit electrically connected to the non-contact breathing detection unit, configured to: perform signal processing on the reflected echo signals to obtain a periodic signal waveform characterizing the occupant's breathing state; identify the occupant's inhalation and exhalation phases based on the periodic signal waveform; generate an activation command in response to the detection of the inhalation phase; and generate a deactivation command in response to the detection of the exhalation phase. The system includes: a prediction compensation unit, which, based on the analysis of periodic signal waveforms formed by the occupant in multiple historical respiratory cycles, predicts the start time of the next inspiratory phase and outputs an opening command at a preset time point before the predicted start time of the inspiratory phase to compensate for the response delay of the solenoid valve; a gas delivery and control unit, including a solenoid valve at the oxygen supply end and an oxygen outlet, wherein the solenoid valve is electrically connected to the central control unit and is configured to open according to an opening command to supply oxygen to the occupant and close according to a closing command to stop supplying oxygen; and an oxygen generation or storage unit, which is in fluid communication with the gas delivery and control unit for providing oxygen.

[0055] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0056] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0057] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0059] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0060] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for controlling intelligent on-board oxygen supply in a vehicle with synchronized breathing, characterized in that, include: The system transmits electromagnetic waves to the occupants via millimeter-wave radar and receives reflected echo signals caused by the occupants' breathing movements. The reflected echo signal is processed to obtain a periodic signal waveform characterizing the occupant's respiratory state; The occupant's inhalation and exhalation phases are identified based on the periodic signal waveform. In response to the detection of the inhalation phase, an opening command is output to the solenoid valve located at the end of the oxygen supply to supply oxygen to the occupant; In response to the detection of the exhalation phase, a shut-off command is output to the solenoid valve to stop the supply of oxygen to the occupant; This also includes: based on the analysis of the periodic signal waveforms formed by the occupant in multiple historical breathing cycles, predicting the start time of the next inhalation phase, and outputting the opening command at a preset time point before the predicted start time of the inhalation phase to compensate for the response delay of the solenoid valve.

2. The method according to claim 1, characterized in that, The signal processing of the reflected echo signal includes: filtering the reflected echo signal using a bandpass filter to filter out low-frequency interference signals with frequencies below a first preset threshold and high-frequency interference signals with frequencies above a second preset threshold, wherein the low-frequency interference signals include signals caused by the slow movement of the occupant's body, and the high-frequency interference signals include signals caused by vehicle vibration.

3. The method according to claim 1, characterized in that, The process of obtaining a periodic signal waveform characterizing the occupant's respiratory state includes: performing phase demodulation on the reflected echo signal and extracting a respiratory waveform that approximates a sine wave with the occupant's respiratory motion from the phase change.

4. The method according to claim 1, characterized in that, The method of identifying the occupant's inhalation and exhalation phases based on the periodic signal waveform includes: detecting rising and falling segments in the periodic signal waveform, identifying the rising segment as the inhalation phase, and identifying the falling segment as the exhalation phase.

5. The method according to claim 1, characterized in that, The preset time point is 50-80 milliseconds.

6. The method according to claim 1, characterized in that, The millimeter-wave radar is installed in the seat back, B-pillar or headliner of the vehicle, the solenoid valve is located inside the headrest of the vehicle seat, and the oxygen supply terminal is a diffuse oxygen outlet.

7. The method according to claim 1, characterized in that, The millimeter-wave radar operates in the frequency band of 60GHz, 77GHz, or 79GHz, and its beam range covers the torso of a single occupant.

8. A breathing-synchronized intelligent vehicle-mounted oxygen supply control system, characterized in that, include: A non-contact breathing detection unit is used to transmit electromagnetic waves to the occupant and receive reflected echo signals caused by the occupant's breathing movements. The non-contact breathing detection unit includes millimeter-wave radar. The central control unit, electrically connected to the non-contact respiratory detection unit, is configured as follows: The reflected echo signal is processed to obtain a periodic signal waveform characterizing the occupant's respiratory state; The occupant's inhalation and exhalation phases are identified based on the periodic signal waveform. In response to the detection of the inhalation phase, an activation command is generated; In response to the detection of the exhalation phase, a shutdown command is generated; The prediction compensation unit, based on the analysis of the periodic signal waveforms formed by the occupant in multiple historical breathing cycles, predicts the start time of the next inhalation phase, and outputs the opening command at a preset time point before the predicted start time of the inhalation phase to compensate for the response delay of the solenoid valve. The gas delivery and control unit includes a solenoid valve at the oxygen supply end and an oxygen outlet. The solenoid valve is electrically connected to the central control unit and is configured to open according to the opening command to supply oxygen to the occupants, and to close according to the closing command to stop supplying oxygen. as well as An oxygen generation or storage unit, in fluid communication with the gas delivery and control unit, is used to provide the oxygen.

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