Protection system and protection method for children forgetting in car

Abstract

The invention belongs to the technical field of vehicle safety protection, and particularly relates to a protection system and method for a child forgetting in a vehicle, the protection system comprises a living body detection device arranged in the vehicle and used for detecting the child in the vehicle and a control module connected with the living body detection device, and the control module is connected with an alarm module. The control module is connected with the vehicle door locking state checking module, the vehicle door closing state checking module and the vehicle power assembly closing state checking module. According to the protection system and protection method for the child forgetting in the vehicle, a living body detection device, a vehicle door locking state inspection module, a vehicle door closing state inspection module, a vehicle power assembly closing state inspection module and other modules are integrated. The vehicle state and the conditions of people in the vehicle are monitored in multiple aspects, whether the child is trapped in the vehicle or not is accurately judged by integrating information of the modules, misjudgment possibly caused by single-factor judgment is avoided, and the accuracy of the system for evaluating the trapped risk of the child is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety protection, and specifically to a protection system and method for children left forgotten in a vehicle. Background Art

[0002] Leaving a child alone in a parked vehicle, even for just a few minutes, can lead to heatstroke or even death, especially in direct sunlight. Since children are unable to leave the vehicle on their own and have a relatively low tolerance to high temperatures, children should never be left alone in a vehicle. The temperature inside the vehicle can quickly rise to a dangerous level within just 15 minutes, and slightly opening the windows can hardly effectively reduce the risk.

[0003] Although the number of child deaths caused by vehicle-related heatstroke is less than those caused by car accidents, such completely avoidable tragedies deserve special attention, especially since existing technologies can solve the problem of children suffering heatstroke in a vehicle. In view of this, we propose a protection system and method for children left forgotten in a vehicle. Summary of the Invention

[0004] The main purpose of the present invention is to provide a protection system and method for children left forgotten in a vehicle, which can solve the problems raised in the above background art.

[0005] To achieve the above object, a protection system and method for children left forgotten in a vehicle proposed by the present invention includes a living body detection device disposed inside the vehicle for detecting children inside the vehicle and a control module connected to the living body detection device. The control module is connected to an alarm module, and the control module is respectively connected to a door locking state inspection module, a door closing state inspection module, and a vehicle powertrain shutdown state inspection module. After the control module receives a signal that the door is closed and locked and at the same time a signal that there is someone inside the vehicle, the control module sends an alarm signal to the alarm module and the emergency light flashing module, thereby attracting the attention of passers-by around the vehicle and providing an opportunity for rescue. At the same time, the control module sends an alarm signal to the GSM communication module, enabling the vehicle owner to obtain a warning message or a call, so that the vehicle owner can send an unlocking signal to the control module through the mobile phone, giving the child a chance to be rescued. If there is no rescue after a long time of alarm and the child is still inside the vehicle, the controller will send a control signal to the door control module.

[0006] Preferably, the living body detection device adopts millimeter-wave sensing technology (operating frequency: 60 GHz).

[0007] Preferably, the living body detection device includes the following steps:

[0008] S1. Parameter initialization. The in-vehicle vital detection device is initialized according to pre-set parameters, including detection range setting (determining a suitable detection area based on the size and shape of the vehicle interior space), sensitivity adjustment (setting the sensitivity to human activities or vital signs according to different environments and detection requirements), and communication protocol configuration with the control module, etc.

[0009] S2. Detection and signal acquisition. The in-vehicle vital detection device enters a continuous working state to monitor the vehicle interior in real time. The in-vehicle vital detection device uses millimeter-wave sensing technology. The millimeter-wave sensor emits millimeter-wave signals, which propagate in the vehicle interior space. When encountering a child in the vehicle, some signals are reflected back. The sensor receives the reflected millimeter-wave signals and determines information such as the position, distance, speed, and shape of the target object by analyzing parameter changes such as the phase, frequency, and amplitude of the signals.

[0010] S3. Judgment and signal transmission. According to the signal analysis results, the in-vehicle vital detection device determines whether there is a child in the vehicle. If a signal pattern conforming to the characteristics of a child (such as a human contour within a specific height range, an activity pattern conforming to the behavioral characteristics of a child, etc.) is detected, it is determined that there is a child in the vehicle. Once it is determined that there is a child in the vehicle, the in-vehicle vital detection device immediately transmits the detection result to the control module in the form of a signal. After receiving the signal, the control module further determines whether the child is in a trapped and dangerous state by combining information such as the door lock state, door closed state, and vehicle powertrain off state, so as to decide subsequent operations such as whether to trigger an alarm, notify the vehicle owner, and take rescue measures.

[0011] S4. Abnormal situation handling. If a sudden situation causes the detection to be interrupted, such as the vehicle being strongly shaken (such as by natural disasters, etc.) or a short-term power fluctuation, the in-vehicle vital detection device will record the detection state before the interruption and attempt to automatically resume detection.

[0012] Preferably, the communication protocol between the in-vehicle vital detection device and the control module in step S1 follows the CAN 2.0 standard. After the in-vehicle vital detection device completes the detection, according to the detection results and the information to be transmitted, it organizes data frames in accordance with the defined frame format and waits for the CAN bus to be idle. When the bus is idle, it competes for the bus usage right according to the priority rules of the arbitration field. Once it obtains the bus usage right, the in-vehicle vital detection device starts to send data frames. The control module continuously listens on the bus. When a data frame with the specific ID of the in-vehicle vital detection device is detected, it receives the data and parses it. After parsing, it performs corresponding operations according to the data content.

[0013] Preferably, in step S2, millimeter-wave radar is used for signal acquisition to extract respiration and heartbeat signals, and the Matlab processing algorithm is used. In millimeter-wave radar detection, distance measurement is based on the time difference between the transmitted signal and the received signal. Let the speed of light be c and the time difference between the transmitted signal and the received signal be △t. Then the formula for calculating the distance between the target object and the radar is For detecting phase changes caused by minute displacements such as respiration and heartbeat, there is a formula where △φ is the phase change amount, λ is the millimeter-wave wavelength, and △R is the displacement amount of the target object. This formula shows that a smaller wavelength λ can produce a more obvious phase change for minute displacements, thereby improving the detection sensitivity to weak vibrations such as respiration and heartbeat. Through respiration signal extraction and heartbeat signal extraction, the designed IIR band-pass filter is used to filter the filtered phase signal, output the respiration signal, observe the amplitude and frequency distribution of the heartbeat signal, and then judge whether the child's heartbeat state is normal.

[0014] Preferably, the GSM communication module includes data reception and processing, signal modulation and transmission, and base station transmission and network routing. The GSM communication module first receives data from the control module. The data is transmitted to the microprocessor inside the module through a pre-set communication interface. If the data format is correct and passes the verification, the microprocessor encapsulates and encodes the data according to the GSM short message protocol and prepares to send it. The encoded and encapsulated data is passed to the GSM modem chip, and the modulated radio frequency signal is transmitted through the antenna and wirelessly transmitted to a nearby GSM base station. After receiving the radio frequency signal from the vehicle GSM communication module, the base station demodulates, decodes, etc. the signal to restore the original data content. The base station performs routing selection and transmission through the core network of the GSM network according to the destination of the data, and finally reaches the target base station (i.e., the base station in the area where the vehicle owner is located). The target base station then wirelessly sends the data to the vehicle owner's mobile terminal.

[0015] Preferably, the alarm module includes a voice prompt device, which plays in a loop through voice synthesis technology, and synthesizes and plays voice signals in real time according to the set text content (such as "There is a child trapped in the vehicle, please rescue immediately!")

[0016] Preferably, the emergency light flashing module controls the warning light to flash at a specific frequency. The emergency light flashing module controls the warning light to turn on at a specific flashing frequency and mode according to the received signal, and flashes quickly 3 - 5 times per second.

[0017] Preferably, a protection method for a child left in the vehicle includes the following steps:

[0018] S1. After the system is initialized, each module is in the standby state, and the vehicle state change is monitored in a timely manner;

[0019] S2. When the vehicle powertrain is turned off, the detection device detects the occupants of the vehicle;

[0020] S3. If someone is detected in the car and the door is locked, the control module triggers the alarm, warning lights and notifies the owner;

[0021] S4, waiting for rescue response. If a rescue signal is received within a short time, the alarm is stopped; if no rescue is received for a long time and the child is still in the car, the control module controls the door control module to take emergency rescue measures.

[0022] Preferably, the emergency rescue measures include opening the car windows for ventilation and cooling, starting the air conditioning system in the car, etc. During the window lifting process, the window control module will monitor the position of the window in real time according to the signal fed back by the window position sensor to ensure that the window is opened to a specified degree. The air conditioning start control module in the car sends a start command to the air conditioning control system of the vehicle, and the command information is transmitted to the air conditioning control system through the vehicle's internal network (CAN bus).

[0023] The present invention provides a protection system and a protection method for children forgotten in a car, which have the following beneficial effects:

[0024] (1) The child protection system forgotten in the car integrates multiple functional modules such as a liveness detection device, a door lock status check module, a door closed status check module, and a vehicle powertrain closed status check module. These modules work together to monitor the vehicle status and the situation of the people in the car from multiple aspects. By integrating the information of these modules, it can accurately determine whether a child is trapped in the car, avoiding the misjudgment that may be caused by a single factor, and greatly improving the accuracy of the system's assessment of the risk of children being trapped. From the perspective of the automotive industry, the demand for this child protection system forgotten in the car has prompted the automotive industry to continuously innovate and improve vehicle safety systems and develop more advanced and reliable child protection technologies and equipment.

[0025] (2) The child protection system is equipped with a control module. As the core of the entire child protection system, the control module is responsible for receiving information from various detection modules (such as the door lock status inspection module, the door closing status inspection module, the vehicle powertrain closing status inspection module and the liveness detection device). It has powerful data processing capabilities and can quickly and accurately integrate and analyze this information. This efficient data processing and accurate judgment ability ensures that the system can respond in a timely manner, buys valuable time for subsequent rescue operations, and effectively avoids children from being exposed to greater dangers due to processing delays.

[0026] (3) The protection method for children left in the vehicle. The application and promotion of this protection method help to enhance the public's attention and safety awareness regarding children's safety in the vehicle. After understanding and using this protection system, vehicle owners will treat children's safety in the vehicle more carefully, develop the good habit of carefully checking the vehicle interior before getting off, and enhance their sense of responsibility for children's safety. At the same time, it will also arouse the extensive attention of all sectors of society to children's safety issues, encourage more people to participate in children's safety protection work, form a good social atmosphere, and jointly prevent dangerous situations such as children being trapped in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic structural diagram of the system of the present invention;

[0029] Figure 2 It is a schematic structural diagram of the process of the living body detection device of the present invention;

[0030] Figure 3 It is a schematic layout diagram of the living body detection device of the present invention;

[0031] Figure 4 It is a schematic process diagram of the GSM communication module of the present invention.

[0032] The realization of the purpose, functional features, and advantages of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] Please refer to Figures 1 - 4, the present invention provides a protection system and method for children left in the vehicle, including a living body detection device arranged in the vehicle for detecting children in the vehicle and a control module connected to the living body detection device. The control module is connected to an alarm module, and the control module is respectively connected to a door lock state inspection module, a door closed state inspection module, and a vehicle powertrain shutdown state inspection module. After receiving the signals that the door is closed and locked and there is someone in the vehicle, the control module sends an alarm signal to the alarm module and the emergency light flashing module, thereby attracting the attention of passers-by around the vehicle and providing an opportunity for rescue. At the same time, the control module sends an alarm signal to the GSM communication module, enabling the vehicle owner to obtain a warning message or a call, so that the vehicle owner can send an unlocking signal to the control module through the mobile phone, giving children a chance to be rescued. If there is no rescue after a long time of alarm and the child is still in the vehicle, the controller will send a control signal to the door control module. The control module has a powerful data processing ability and can quickly and accurately integrate and analyze this information. This efficient data processing and accurate judgment ability ensure that the system can respond in a timely manner, striving for precious time for subsequent rescue operations and effectively avoiding greater risks faced by children due to processing delays.

[0035] In an embodiment of the present invention, the living body detection device adopts millimeter-wave sensing technology, and the living body detection device includes the following steps:

[0036] S1. Parameter initialization, the living body detection device is initialized according to preset parameters, and the parameters include detection range setting (determining a suitable detection area according to the size and shape of the vehicle interior space), sensitivity adjustment (setting the sensitivity to human activities or vital signs according to different environments and detection requirements), and communication protocol configuration with the control module, etc.

[0037] S2. Detection and signal acquisition, the living body detection device enters a continuous working state, continuously monitors the vehicle interior environment. The living body detection device uses millimeter-wave sensing technology, and the millimeter-wave sensor emits millimeter-wave signals. These signals propagate in the vehicle interior space. When encountering a child in the vehicle, some signals are reflected back. The sensor receives the reflected millimeter-wave signals and determines information such as the position, distance, speed, and shape of the target object by analyzing parameter changes such as the phase, frequency, and amplitude of the signals.

[0038] S3. Judgment and signal transmission: Based on the signal analysis results, the in-vehicle living body detection device determines whether there is a child in the vehicle. If a signal pattern conforming to the characteristics of a child (such as a human contour within a specific height range, an activity pattern conforming to the behavioral characteristics of a child, etc.) is detected, it is determined that there is a child in the vehicle. Once it is determined that there is a child in the vehicle, the in-vehicle living body detection device immediately transmits the detection result to the control module in the form of a signal. After receiving the signal, the control module further determines whether the child is in a trapped and dangerous state by combining information such as the door lock state, the door closed state, and the vehicle powertrain off state, so as to decide whether to trigger subsequent operations such as alarm, notify the vehicle owner, and take rescue measures.

[0039] S4. Abnormal situation handling: If a sudden situation causes the detection to be interrupted, such as the vehicle being strongly shaken (such as natural disasters, etc.), a short-term power fluctuation, etc., the in-vehicle living body detection device will record the detection state before the interruption and attempt to automatically resume the detection. The communication protocol between the in-vehicle living body detection device and the control module in step S1 follows the CAN 2.0 standard. After the in-vehicle living body detection device completes the detection, according to the detection results and the information to be transmitted, it organizes data frames in accordance with the defined frame format, waits for the CAN bus to be idle, and competes for the bus usage right according to the priority rules of the arbitration field when the bus is idle. Once the bus usage right is obtained, the in-vehicle living body detection device starts to send data frames. The control module continuously listens on the bus and receives and parses the data frame when a data frame with the specific ID of the in-vehicle living body detection device is detected. After parsing, corresponding operations are performed according to the data content. In step S2, the signal acquisition uses a millimeter-wave radar to extract respiration and heartbeat signals and a Matlab processing algorithm. In the millimeter-wave radar detection, the distance measurement is based on the time difference between the transmitted signal and the received signal. Let the speed of light be c and the time difference between the transmitted signal and the received signal be △t, then the distance calculation formula between the target object and the radar is, for detecting the phase change caused by small displacements such as respiration and heartbeat, there is a formula Where △φ is the phase change amount, λ is the millimeter-wave wavelength, and △R is the displacement amount of the target object. This formula indicates that a smaller wavelength λ can produce a more obvious phase change for a tiny displacement, thereby improving the detection sensitivity to weak vibrations such as breathing and heartbeat. Resample the received signal, process the data containing real and imaginary parts, combine them into a complex form, and perform recombination. Use methods such as high-pass filters to remove the DC component in the signal, and reduce the influence of noise on the signal through methods such as average filtering to improve the signal quality. Perform a fast Fourier transform (FFT) in the distance dimension on the preprocessed signal. By analyzing the amplitude distribution of the FFT result, the approximate position of the human body in the distance dimension can be determined. Calculate the average value of the reference received pulse, and then subtract this average value from the FFT result of each pulse to eliminate static interference. Separate the real and imaginary parts of the processed signal data, and then use the arctangent function to calculate the phase for the real and imaginary parts of each distance unit. Design an IIR band-pass filter to filter the filtered phase signal and output the breathing signal. Then, plot the time-domain waveform and perform spectral estimation (FFT) on the breathing signal. By analyzing the peak of the FFT result, the breathing frequency can be found and calculated, thereby realizing the monitoring of the breathing state of children. Design an IIR band-pass filter to filter the filtered phase signal to obtain the heartbeat signal. Similarly, plot the time-domain waveform and perform spectral estimation (FFT) on the heartbeat signal to find the peak of the heartbeat frequency and calculate the heartbeat frequency. By analyzing the characteristics of the heartbeat signal, the amplitude and frequency distribution of the heartbeat signal can be observed, and then it can be judged whether the heartbeat state of the child is normal. The GSM communication module includes data reception and processing, signal modulation and transmission, and base station transmission and network routing. The GSM communication module first receives data from the control module. The data is transmitted to the microprocessor inside the module through a pre-set communication interface. If the data format is correct and passes the verification, the microprocessor will encapsulate and encode the data according to the GSM short message protocol and prepare to send it. The encoded and encapsulated data is passed to the GSM modem chip, and the modulated radio frequency signal is transmitted through the antenna and wirelessly transmitted to the nearby GSM base station. After receiving the radio frequency signal from the vehicle GSM communication module, the base station demodulates, decodes, and other processes the signal to restore the original data content. The base station performs routing selection and transmission through the core network of the GSM network according to the destination of the data, and finally reaches the target base station (i.e., the base station in the area where the vehicle owner is located). The target base station then wirelessly sends the data to the mobile phone terminal of the vehicle owner. The alarm module includes a voice prompt device, which plays in a loop through voice synthesis technology, synthesizes voice signals in real time according to the set text content (such as "There is a child trapped in the vehicle, please rescue immediately!") and plays them. The emergency light flashing module controls the warning light to flash at a specific frequency. The emergency light flashing module controls the warning light to light up at a specific flashing frequency and mode according to the received signal, flashing quickly 3-5 times per second.

[0040] A protection method for children left unattended in a vehicle, comprising the following steps:

[0041] S1. After system initialization, each module is in a standby state, and the vehicle state change is monitored in a timely manner;

[0042] S2. When the vehicle powertrain is turned off, the detection device detects the people inside the vehicle;

[0043] S3. If someone is detected inside the vehicle and the door is locked, the control module triggers an alarm, warning lights and notifies the vehicle owner;

[0044] S4. Wait for the rescue response. If a rescue signal is received within a short time, stop the alarm; if no rescue is received for a long time and the child is still inside the vehicle, the control module controls the door control module to take emergency rescue measures. During the window lifting and lowering process, the window control module will monitor the position of the window in real time according to the signal feedback by the window position sensor to ensure that the window is opened to the specified degree. The in-vehicle air conditioner start control module sends a start command to the vehicle's air conditioner control system, and the command information is transmitted to the air conditioner control system through the vehicle internal network (CAN bus), which helps to enhance the public's attention and safety awareness of children's safety in the vehicle. After understanding and using this protection system, vehicle owners will treat children's safety in the vehicle more carefully, develop a good habit of carefully checking the situation inside the vehicle before getting off, and enhance their sense of responsibility for children's safety. At the same time, it will also arouse the wide attention of all sectors of society to children's safety issues, encourage more people to participate in children's safety protection work, form a good social atmosphere, and jointly prevent dangerous situations such as children being trapped in the vehicle from occurring.

[0045] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A protection system and method for children forgotten in a car, comprising a liveness detection device arranged in the car for detecting children in the car and a control module connected to the liveness detection device, wherein the control module is connected to an alarm module, and is characterized in that: The control module is respectively connected to the door locking status inspection module, the door closing status inspection module, and the vehicle powertrain closing status inspection module. After receiving the door closing and locking signal and the signal that there is someone in the car, the control module sends an alarm signal to the alarm module and the emergency light flashing module, thereby attracting the attention of passers-by around the vehicle and providing a rescue opportunity. At the same time, the control module sends an alarm signal to the GSM communication module so that the vehicle owner receives a warning message or a phone call, thereby sending an unlocking signal to the control module through the mobile phone, giving the child a chance to be rescued. If the alarm sounds for a long time but no one rescues, and the child is still in the car, the controller will send a control signal to the door control module.

2. A protection system and method for preventing children from being forgotten in a vehicle according to claim 1, characterized in that: The living body detection device adopts millimeter wave sensing technology (60GHz).

3. A system and method for protecting children from being forgotten in a vehicle according to claim 1, characterized in that: The living body detection device comprises the following steps: S1. Parameter initialization: the living body detection device is initialized according to pre-set parameters. S2, detection and signal acquisition, the living body detection device enters a continuous working state and monitors the vehicle interior environment in real time. S3. Judgment and signal transmission: Based on the signal analysis result, the living body detection device determines whether there is a child in the car. S4. Abnormal situation handling. If an unexpected situation causes the detection to be interrupted, such as the vehicle being strongly shaken (such as a natural disaster, etc.) or a brief power fluctuation, the liveness detection device will record the detection status before the interruption and try to automatically resume the detection.

4. A system and method for protecting a child from being forgotten in a vehicle according to claim 3, characterized in that: The communication protocol between the living body detection device and the control module in step S1 complies with the CAN 2.0 standard.

5. A system and method for protecting children from being forgotten in a car according to claim 3, characterized in that: In step S2, the signal acquisition uses the millimeter wave radar to extract the breathing and heartbeat signals Matlab processing algorithm. In the millimeter wave radar detection, the distance measurement is based on the time difference between the transmitted signal and the received signal. Assuming the speed of light is c, the time difference between the transmitted signal and the received signal is △t, then the distance calculation formula between the target object and the radar is, for the detection of phase changes caused by small displacements such as breathing and heartbeat, there is a formula Where △φ is the phase change, λ is the millimeter wave wavelength, and △R is the displacement of the target object.

6. A system and method for protecting children from being forgotten in a vehicle according to claim 1, characterized in that: The GSM communication module includes data reception and processing, signal modulation and transmission, base station transmission and network routing.

7. A system and method for protecting children from being forgotten in a vehicle according to claim 1, characterized in that: The alarm module includes a voice prompter, which is played in a loop through speech synthesis technology.

8. The system and method for protecting a child from being forgotten in a vehicle according to claim 1, characterized in that: The emergency light flashing module controls the warning light to flash at a specific frequency.

9. The method for protecting a child from being forgotten in a car according to claim 1, characterized in that: The following steps are involved: S1. After the system is initialized, each module is in standby mode to monitor vehicle status changes in a timely manner; S2. When the vehicle powertrain is turned off, the detection device detects the occupants of the vehicle; S3. If someone is detected in the car and the door is locked, the control module triggers the alarm, warning lights and notifies the owner; S4, waiting for rescue response. If a rescue signal is received within a short time, the alarm is stopped; if no rescue is received for a long time and the child is still in the car, the control module controls the door control module to take emergency rescue measures.

10. A method for protecting a child from being forgotten in a car according to claim 2, characterized in that: The emergency rescue measures include opening car windows for ventilation and cooling, starting the car's air conditioning system, and the like.

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