KR20230154366A - Method for supporting sleep for infants and toddlers based on UWB radar and apparatus and system therefor - Google Patents

Abstract

The present invention relates to a method for supporting infant sleep based on UWB radar and an apparatus and system therefor. The method for supporting infant sleep in a vehicle according to an aspect of the present disclosure includes the steps of transmitting a UWB (Ultra Wideband) radar signal and the UWB Receiving an (Ultra Wideband) radar signal, determining the status of the occupant based on the received UWB radar signal, and outputting a sleep support sound source based on the determination result, wherein: States may include sleep states and non-sleep states.

Description

Method for supporting sleep for infants and toddlers based on UWB radar and apparatus and system therefor {Method for supporting sleep for infants and toddlers based on UWB radar and apparatus and system therefor}

The present invention relates to sleep support technology for infants and young children, and more specifically, to technology for supporting sleep of infants and children riding in a vehicle based on UWB radar.

Because electric vehicles are quiet when driving at low speeds, governments around the world are imposing new requirements for incorporating Acoustic Vehicle Alerting Systems (AVAS) in electric vehicles to protect pedestrians and other traffic users. On the other hand, when driving at high speeds, electric vehicles must handle wind noise more precisely to improve interior acoustics. Recently, the automotive industry has been using new approaches to solve both of these challenges, such as adding a new sound layer using Active Sound Design (ASD) solutions.

ASD is a technology that synthesizes vehicle sounds by applying sound reinforcement techniques to change or improve sounds inside and outside the vehicle based on information such as the vehicle's current gear, acceleration, and speed.

Recently, as demand for eco-friendly engines has increased, the efficiency of engine systems has increased, but the auditory satisfaction provided to drivers while driving has decreased.

Additionally, electric vehicles and fuel cell vehicles generate high-pitched sounds that typical internal combustion engine engines do not have. Therefore, in order to satisfy consumers with the emotional quality of engine sounds, vehicle manufacturers artificially generate or strengthen engine sounds using ASD, as shown in Figure 1, and then output them through vehicle speakers. For example, when the ASD function is turned off, a 4-cylinder engine sound may be generated and output, and when the ASD function is turned on, a 6-cylinder engine sound may be generated and output.

Since the conventional ASD system was developed to enhance the fun of driving and give the driver a sense of immersion, it generates engine sound only when the RPM (Revolution Per Minute) increases by pressing the accelerator pedal. In general, engine noise heard during constant speed driving acts as noise to passengers, so it is removed using ANC (Active Noise Control) techniques. However, engine sound, like white noise, helps infants and toddlers sleep, so it is best to continuously generate it when the child is asleep.

The current ASD system has a problem in that it is difficult to use for the purpose of helping infants sleep because it reduces or stops engine sound output unless it is accelerating.

In situations where an infant or child in a vehicle is asleep and the vehicle stops briefly due to waiting for a signal, or the vehicle is parked upon arrival at a destination, the current ASD system keeps the engine sound output low or stops, so there is a chance that the infant will recognize the change in situation and wake up. There is this high problem.

The purpose of the present disclosure is to provide a method and a device and system for supporting sleep of infants and children riding in a vehicle.

Another object of the present disclosure is a UWB radar-based infant sleep support method capable of supporting stable sleep of rear seat occupants by determining whether the rear seat occupants are sleeping based on UWB radar and adaptively generating engine sound regardless of vehicle status; and The goal is to provide devices and systems for this.

Another purpose of the present disclosure is a UWB radar capable of improving the customer satisfaction of both the driver and the passenger by automatically generating engine sounds to support the sleep of the infant in situations where the driver is unable to recognize whether the infant or child riding in the driver's seat is sleeping. The purpose is to provide a sleep support method for infants and young children and devices and systems therefor.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A method for supporting infant sleep in a vehicle according to an aspect of the present disclosure includes the steps of transmitting an Ultra Wideband (UWB) radar signal, receiving the Ultra Wideband (UWB) radar signal, and based on the received UWB radar signal. It includes determining the state of and outputting a sleep support sound source based on the determination result, where the state of the occupant may include a sleeping state and a non-sleeping state.

In an embodiment, the UWB (Ultra Wideband) radar signal may be transmitted in the form of a short pulse while changing the range.

In an embodiment, determining the status of the occupant based on the received UWB radar signal may include measuring the breathing rate, location, and heart rate of the occupant based on the received UWB radar signal.

In an embodiment, the status of the occupant may be determined based on at least one of the amount of change in the average respiratory rate measured for each time section, the variance value of the position measured during a specific time, and the amount of change in the average heart rate measured for each time section.

In an embodiment, the conditions for determining the status of the occupant include a first condition in which the absolute value of the change in the average respiratory rate measured for each time section is greater than a predetermined respiratory rate threshold, and the variance value of the position measured for a specific time is a predetermined position. It may include a second condition that is less than a threshold value and a third condition that the amount of change in the average heart rate measured for each time interval is less than a predetermined heart rate threshold value.

In an embodiment, the state of the occupant may be determined to be the sleeping state based on all of the first to third conditions being satisfied.

In an embodiment, based on the fact that any one of the first to third conditions is not satisfied, the state of the occupant may be determined to be the non-sleeping state.

In an embodiment, whether the second condition is satisfied may be determined based on the first condition being satisfied, and whether the third condition is satisfied may be determined based on the second condition being satisfied.

In an embodiment, the method further includes displaying a pop-up window on a display provided to check whether the sleep support system is activated to the driver based on the state of the occupant being the sleep state, wherein the step of displaying the pop-up window by the driver. The sleep support sound source may be output based on the sleep support system being activated.

In an embodiment, the sleep support sound source includes white noise or a similar engine sound corresponding to RPM (Revolution Per Minute), and the sleep support sound source may be maintained in memory in the form of a wavetable.

In an embodiment, the method further includes the step of identifying the location of the occupant, wherein the sleep support sound source is output through a speaker corresponding to the location of the identified occupant, and based on the fact that the location of the occupant is not identified, Output of the sleep support sound source may be stopped.

In an embodiment, the method further includes comparing the remaining battery amount of the vehicle with a predetermined battery threshold, wherein the sleep support sound source is output based on the remaining battery amount being greater than the battery threshold, and the remaining battery amount is greater than the battery threshold. Output of the sleep support sound source may be stopped based on the battery being below the threshold.

In an embodiment, the sleep support sound source is output when the occupant's state is the sleep state, but output may be stopped based on the occupant's state being switched from the sleep state to the non-sleep state.

In an embodiment, the sleep support sound source output may be controlled according to the status of the occupant regardless of whether the vehicle is stopped or parked.

A non-volatile computer-readable storage medium storing at least one computer program including instructions that, when executed by at least one processor according to another aspect of the present disclosure, cause the at least one processor to perform infant sleep support operations. The operations include transmitting a UWB (Ultra Wideband) radar signal, receiving the UWB (Ultra Wideband) radar signal, determining the status of the occupant based on the received UWB radar signal, and a result of the determination. and outputting a sleep support sound source based on , and the state of the occupant may include a sleeping state and a non-sleeping state.

A sleep support system for vehicle occupants according to another aspect of the present disclosure is based on a UWB radar that transmits and receives UWB (Ultra Wideband) radar signals to measure the respiratory rate, location, and heart rate of the occupant, and information received from the UWB radar. and a sleep support device that determines the state of the occupant and controls the output of the sleep support sound source based on the determination result, and the state of the occupant may include a sleep state and a non-sleep state.

In an embodiment, the UWB radar may change the range of the UWB (Ultra Wideband) radar signal and transmit it in the form of a pulse.

In an embodiment, the sleep support device monitors the occupant's condition based on at least one of the amount of change in the average respiratory rate measured for each time section, the variance value of the position measured during a specific time, and the amount of change in the average heart rate measured for each time section. You can decide.

In an embodiment, the conditions for determining the status of the occupant include a first condition in which the absolute value of the change in the average respiratory rate measured for each time section is greater than a predetermined respiratory rate threshold, and the variance value of the position measured for a specific time is a predetermined position. It may include a second condition that is less than a threshold value and a third condition that the amount of change in the average heart rate measured for each time interval is less than a predetermined heart rate threshold value.

In an embodiment, the sleep support device may determine the occupant's state to be the sleeping state based on all of the first to third conditions being satisfied.

In an embodiment, the sleep support device may determine the occupant's state to be the non-sleep state based on the fact that any one of the first to third conditions is not satisfied.

In an embodiment, the sleep support device may determine whether the second condition is satisfied based on the first condition being satisfied, and determine whether the third condition is satisfied based on the second condition being satisfied. there is.

In an embodiment, the sleep support device controls the display to display a pop-up window for the driver to check whether the sleep support system is activated based on the occupant's state being the sleep state, and the sleep support device The sleep support sound source may be controlled to be output based on activation of the sleep support system by the driver.

In an embodiment, the sleep support sound source includes white noise or a similar engine sound corresponding to RPM (Revolution Per Minute), and the sleep support sound source may be maintained in a memory provided in the form of a wavetable.

In an embodiment, the sleep support device identifies the location of the occupant, outputs the sleep support sound source through a speaker provided corresponding to the identified location of the occupant, and based on the fact that the location of the occupant is not identified, the sleep support device Sleep support sound output may be interrupted.

In an embodiment, the sleep support system further includes a battery management system that provides status information of a battery provided in the vehicle, and the sleep support device compares the remaining battery capacity of the vehicle with a predetermined battery threshold, and determines the remaining battery capacity of the vehicle. The sleep support sound source may be controlled to be output based on the battery threshold being greater than the battery threshold, and output of the sleep support sound source may be stopped based on the battery remaining amount being less than or equal to the battery threshold.

In an embodiment, the sleep support sound source is output when the occupant's state is the sleep state, but output may be stopped based on the occupant's state being switched from the sleep state to the non-sleep state.

In an embodiment, the output of the sleep support sound source may be controlled according to the status of the occupant regardless of whether the vehicle is stopped or parked.

The technical problems to be achieved in the embodiments according to the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be explained to those skilled in the art from the description below. You will be able to understand it clearly.

Embodiments according to the present disclosure have the advantage of providing a method for supporting sleep of infants and children riding in a vehicle, and devices and systems therefor.

In addition, embodiments according to the present disclosure determine whether the rear-seat occupants are sleeping based on UWB radar and adaptively generate engine sound regardless of the vehicle state, thereby supporting stable sleep of the rear-seat occupants. There is an advantage in providing a support method and devices and systems for it.

In addition, embodiments according to the present disclosure make it possible to improve the customer satisfaction of both the driver and the passenger by automatically generating an engine sound to support the sleep of the infant or child in a situation where the driver is unable to recognize whether the infant or child riding in the driver's seat is sleeping. There is an advantage in providing a UWB radar-based infant sleep support method and devices and systems for the same.

In addition, embodiments according to the present disclosure provide UWB radar-based infant sleep support that can stably maintain the infant's sleep state by outputting similar engine sounds even in a parking/stop state according to the infant's sleep state estimated based on the UWB radar. There is an advantage in providing a method and a device and system therefor.

In addition, embodiments according to the present disclosure have the advantage of not only preventing idling to generate engine noise necessary to support infants' sleep while parking/stopping, but also effectively preventing exhaust gas emission problems due to idling.

In addition, various effects that can be directly or indirectly identified through this document may be provided.

The drawings attached to this specification are intended to provide an understanding of the present invention, show various embodiments of the present invention, and together with the description of the specification, explain the principles of the present invention.
Figure 1 is a diagram for explaining an example of engine sound change according to ASD operation according to the prior art.
Figure 2 is a diagram for explaining a UWB radar-based breathing rate and heart rate measurement procedure according to an embodiment of the present disclosure.
Figure 3 is a block diagram illustrating a sleep support system for supporting infant sleep based on UWB radar according to an embodiment of the present disclosure.
Figure 4 is a flowchart for explaining a UWB radar-based infant sleep support method according to an embodiment of the present disclosure.
Figure 5 is a flowchart for explaining a UWB radar-based infant sleep support method according to another embodiment of the present disclosure.
6 is a flowchart illustrating the logic for determining the occupant's sleep state according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

In various examples of this disclosure, “/” and “,” should be interpreted as indicating “and/or.” For example, “A/B” can mean “A and/or B.” Furthermore, “A, B” may mean “A and/or B.” Furthermore, “A/B/C” may mean “at least one of A, B and/or C.” Furthermore, “A, B, C” may mean “at least one of A, B and/or C.”

In various examples of this disclosure, “or” should be interpreted as indicating “and/or.” For example, “A or B” may include “only A,” “only B,” and/or “both A and B.” In other words, “or” should be interpreted as indicating “additionally or alternatively.”

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6.

Figure 2 is a diagram for explaining a UWB radar-based breathing rate and heart rate measurement procedure according to an embodiment of the present disclosure.

Referring to FIG. 2, the vehicle UWB radar device 200 may largely include a UWB radar transmitter 210 and a UWB radar receiver 220.

As shown in FIG. 2, the UWB radar transmitter 210 mixes a short pulse signal generated through a pulse generator 211 to the UWB frequency through an oscillator 212, and then mixes it to a variable frequency. It is transmitted inside the vehicle through a gain amplifier (VGA: Variable Gain Amplifier, 213) and a transmission antenna (214).

The UWB radar signal may be reflected by an object 230 located in the vehicle and then received through the receiving antenna 221 of the UWB radar receiver 220.

The received UWB radar signal is amplified by a low noise amplifier (222) and then passed through an integrator (223) and a comparator (224) to the range sample selection unit (Range Sample Selection Unit (225)). You can.

The range sample selection unit 225 can selectively sample signals to be applied to the low pass filter (227) and the high pass filter (228).

The range controller 226 demodulates only the signal reflected and received at a specific distance and then integrates it to check (or determine) whether there is a reflector - that is, the object 230 - at that distance.

If an object 230 - for example, a passenger - exists at the corresponding location in the vehicle, the UWB radar signal reflected and received by the passenger may include sine wave components of a specific frequency depending on the breathing volume and heart rate of the passenger. .

At this time, the presence or absence of a passenger can be determined based on the change in reception time of the UWB radar signal (i.e., the change in distance).

The received UWB radar signal may include a first sinusoidal component related to breathing volume and a second sinusoidal component related to heart rate.

The breathing volume component included in the received UWB radar signal can be filtered through the low-pass filter 227 and used to calculate the passenger's breathing rate (or breathing volume).

The heart rate component included in the received UWB radar signal may be filtered through the high-pass filter 228 and used to calculate the occupant's heart rate.

For example, the passenger's respiratory rate has a frequency of 0.2 to 0.5 Hz, and the heart rate has a frequency of 0.8 to 2.5 Hz, so the low-pass filter 227 and high-pass filter 228 are designed to have a cutoff frequency of 0.65 Hz. can be applied.

The infant sleep support method proposed according to the present disclosure can dynamically determine the sleep state of the occupant based on the breathing volume and heart rate calculated from the UWB radar signal reflected and received from the occupant.

Generally, when a passenger enters a state of deep sleep, the breathing volume changes rapidly, and when the passenger enters a state of complete sleep, the heart rate is maintained lower than usual.

Additionally, the occupant's movement is very small in the initial sleep state.

Therefore, when the presence of a passenger is confirmed, the respiratory rate is measured for each certain period of time - for example, 6 minutes - and if the change in respiratory rate is greater than the predetermined respiratory rate threshold, the passenger is considered to have entered a state of hydrosleep. can be judged. Thereafter, changes in the occupant's position can be tracked during a specific period of time in the hydrostatic state.

In order for a passenger to enter a complete sleep state from a hydrosleep state, the amount of change in the passenger's position measured during a specific time must be less than a predetermined position threshold, and the amount of change in average heart rate measured for each time section must be less than a predetermined heart rate threshold.

If at least one of the breathing rate change amount, the occupant position change amount, and the heart rate change amount does not satisfy the threshold value defined for each, the infant sleep support device according to the embodiment may determine that the occupant is in a non-sleep state. there is.

On the other hand, if the amount of change in breathing rate, change in position of the occupant, and change in heart rate all satisfy the threshold values defined for each, the infant sleep support device according to the embodiment may determine that the occupant is in a sleeping state.

If the occupant is determined to be asleep, the infant sleep support device can generate a similar engine sound and output it through the corresponding speaker in the vehicle.

The distance change based on the UWB radar signal can be calculated by Equation 1 below.

는 거리 변화이고,

는 탑승자까지의 거리이고,

는 심박수에 따른 거리 변화량이고,

는 심박수 주파수이고,

은 호흡수에 따른 거리 변화량이고,

은 호흡량 주파수이다.here,

is the distance change,

is the distance to the passenger,

is the distance change according to heart rate,

is the heart rate frequency,

is the distance change according to the breathing rate,

is the respiratory volume frequency.

Figure 3 is a block diagram illustrating a sleep support system for supporting infant sleep based on UWB radar according to an embodiment of the present disclosure.

The system for supporting infant sleep based on UWB radar according to an embodiment of the present disclosure may be installed in a vehicle, and hereinafter, for convenience of explanation, it will be simply referred to as 'sleep support system 300'.

UWB uses a broadband frequency of several GHz or more to enable high-speed data transmission with high accuracy and high resolution. It also has the advantage of being highly resistant to interference with other wireless systems and being able to operate at low power.

Referring to FIG. 3, the sleep support system 300 may include at least one of a sleep support device 310, a UWB radar 320, a battery management system 330, a speaker 340, and a display 350. You can.

The sleep support device 310 may be configured to include at least one of a passenger sleep determination unit 311, a main control unit 312, a sound source generating unit 313, an amplifying unit 314, and a user interface providing unit 315. there is.

The UWB radar 320 can be mounted inside the vehicle - especially on one side of the rear seat of the vehicle, and generates a UWB radar signal with a short pulse waveform - that is, a pulse train - through the transmitter 312, thereby changing the range. It can be transmitted inside the vehicle, and the UWB radar signal reflected by the object can be received through the receiver 322 provided. The received UWB radar signal can be sampled in real time according to the range and then passed through a filter.

The UWB radar 320 according to an embodiment is equipped with a directional antenna and can transmit a signal in a specific direction and within a specific radius.

The UWB radar 320 has the advantage of not only being able to detect the location of an object, but also detecting subtle movements of the target object.

As explained in FIG. 2, the UWB radar 320 demodulates and integrates only the signal reflected at a specific distance by the range controller 226 to check whether there is an object - that is, a reflector - at that distance, and performs a range sample. After selecting a signal sample corresponding to the range through the selection unit 225, the respiratory rate and heart rate, etc. can be detected from the received UWB radar signal using the low-pass filter 227 and the high-pass filter 228.

The UWB radar 320 can measure the location of the object (occupant) as well as the respiratory rate and heart rate of the occupant based on the size, arrival time, and power information in the selected frequency band of the radar signal reflected and received from the object.

The UWB radar 320 may provide the sleep support device 310 with information about the detected location of the occupant, information about the breathing rate, and information about the heart rate.

The Battery Management System (330) measures various factors such as current, voltage, and temperature of secondary batteries installed in electric vehicles or hybrid electric vehicles through sensors, and monitors the charging and discharging status and remaining amount of the battery to ensure battery use. It is a system that controls the battery to create an optimal operating environment in conjunction with other control systems inside the vehicle.

As an example, the battery management system 330 includes a function to control the status of individual cells of the battery, a function to adjust imbalances in cell parameters within an integrated battery, a function to provide information about the charging and discharging status of the battery, and a function to provide information about the charging and discharging status of the battery, and the remaining battery. Functions that provide information on battery capacity, functions that provide information on battery failure states, functions that provide information on driver displays and alarms, functions that provide information on the battery's usable range - for example, driving range, etc. Functions provided can be provided.

In addition, the battery management system 330 provides an optimal charging algorithm for charging the integrated battery cells, and provides an electric and motor control system suitable for the vehicle's driving mode, including acceleration, braking, and idling, and vehicle driving mode. Battery performance can be adjusted according to (electric vehicle mode, hybrid mode). Additionally, the battery management system 330 may provide access means for charging individual cells.

A plurality of speakers 340 may be installed in the vehicle, and sound sources for supporting infants' sleep - for example, white noise or similar engine sounds according to RPM - may be output.

The display 350 may be implemented as a touch display capable of input and output on the screen, and a pop-up window may be displayed to the driver to check whether the sleep support system is activated.

Hereinafter, the operation of the sleep support device 310 for supporting infant sleep will be described in detail.

The main control unit 312 can control the overall input/output and operation of the sleep support device 310. The main control unit 312 may be connected to a memory (not shown), and various program commands for executing sleep support operations of the main control unit 312 may be maintained in the memory.

The occupant sleep determination unit 311 may obtain information about the occupant's location, information about the occupant's breathing rate, and information about the occupant's heart rate from the UWB radar 320.

The occupant sleep determination unit 311 may determine the sleep state of the occupant based on at least one of the occupant's location, the occupant's breathing rate, and the occupant's heart rate. Here, the sleep state may include a sleep state, a non-sleep state, and a sleep state.

A specific method by which the occupant sleep determination unit 311 determines whether the occupant is asleep will be explained through the description of FIG. 6 which will be described later.

The main controller 312 may determine whether to activate the sleep support operation based on the occupant's sleep state.

The main control unit 312 may control a sound source for sleep support to be output when the occupant enters the sleep state from the sleep state.

The main control unit 312 may control the sound source for sleep support not to be output when the passenger enters the non-sleep state from the sleep state or the non-sleep state from the sleep state.

The main control unit 312 may control the display of a predetermined pop-up window to check whether the sleep support system is activated or not to the driver when the passenger enters the sleep state from the hydrosleep state.

The main control unit 312 may control sound source output based on battery charge state information received from the battery management system 330. As an example, the main controller 312 may control sound source output to be stopped when the remaining battery amount is less than a predefined threshold.

The main controller 312 may identify the occupant's location within the vehicle and control a sleep support sound source to be output through the speaker 340 corresponding to the identified occupant location.

In the above embodiment, it is explained that a specific sound source - for example, white noise, similar engine sound according to RPM, etc. - is played through the speaker to support sleep, but this is only one embodiment and may not be used in other embodiments. The main control unit 312 may control a vibration device provided on one side of the passenger seat of the vehicle to generate a specific vibration pattern for sleep support.

The main control unit 312 adaptively adjusts the output level (i.e., volume) of the sleep support sound source based on noise inside or outside the vehicle and vehicle driving status (e.g., RPM measurement value, current driving speed, APS sensing value, etc.). can also be controlled.

The sound source generator 313 may generate a sound source for sleep support according to a control command from the main controller 312.

The amplification unit 314 may control the output level of the sleep support sound source according to the control command of the main control unit 312.

The user interface creation unit 315 may generate a predetermined pop-up window to check whether the sleep support system is activated or not to the driver according to a control command of the main controller 312.

Figure 4 is a flowchart for explaining a UWB radar-based infant sleep support method according to an embodiment of the present disclosure.

Referring to FIG. 4, the sleep support system 300 may generate and transmit a UWB radar signal with a short pulse waveform (S410).

The sleep support system 300 may receive a UWB radar signal reflected by an object (S420).

The sleep support system 300 may estimate or measure the passenger's breathing rate, the passenger's location, and the passenger's heart rate based on the received UWB radar signal (S430).

The sleep support system 300 may determine the occupant's sleep state based on the estimation or measurement results (S440). Here, the sleep state of the passenger may include a hydrosleep state, a non-sleep state, and a sleep state.

When it is confirmed that the occupant has entered a hydrosleep state, the sleep support system 300 may determine whether the occupant is in a sleeping state (S450).

As a result of the determination, if the passenger is in a sleeping state, the sleep support system 300 may output a sleep support sound source through a speaker corresponding to the passenger's location (S460).

As a result of the determination in step 450, if the sleep support system 300 is in a non-sleep state, the sleep support system 300 may stop the infant sleep support operation.

The sleep support system 300 may determine whether the remaining battery amount is less than the threshold while outputting a sleep support sound source (S470).

As a result of the determination, if the remaining battery amount is less than the threshold, the sleep support system 300 may stop outputting the sleep support sound source (S480).

The sleep support system 300 according to the embodiment has the advantage of being able to adaptively control the output of the sleep support sound source according to the sleep state of the occupant and the battery charge state regardless of whether the vehicle is stopped or parked.

In addition, the sleep support system 300 according to the embodiment can prevent idling to support infant sleep when the vehicle is stopped or parked, and this has the advantage of minimizing unnecessary exhaust gas emissions.

Figure 5 is a flowchart for explaining a UWB radar-based infant sleep support method according to another embodiment of the present disclosure.

Referring to FIG. 5, the sleep support system 300 may determine the sleep state of the occupant through steps 410 to 440 of FIG. 4 (S510).

When the passenger is asleep, the sleep support system 300 may output a pop-up window to the driver to check whether the sleep support system is activated (S520 to S530).

When the sleep support system 300 is activated by the driver, the sleep support system 300 may output a sleep support sound source through a speaker corresponding to the passenger's location (S540 to S550). For example, the sleep support sound source may be white noise or a similar engine sound at a specific RPM (ex: 1500 RPM). Here, since white noise or similar engine sounds are quasi-periodic functions, they can be reproduced using a wavetable with a small memory capacity using an ASD (Activate Sound Design) system.

The sleep support system 300 may stop output of the sleep support sound source to prevent vehicle discharge when the remaining battery amount during output of the sleep support sound source is less than a predetermined threshold (S560 to S570).

The sleep support system 300 according to the embodiment may stop output of the sleep support sound source when the driver requests to stop output of the sleep support sound source through the user interface screen while the sleep support sound source is being output.

The sleep support system 300 according to an embodiment may stop output of a sleep support sound source when the occupant transitions from a sleep state to a non-sleep state while outputting a sleep support sound source.

The sleep support system 300 according to an embodiment may stop outputting the sleep support sound source when the occupant's location is not confirmed while outputting the sleep support sound source - for example, when the passenger gets off the vehicle.

6 is a flowchart illustrating the logic for determining the occupant's sleep state according to an embodiment of the present disclosure.

Referring to FIG. 6, the sleep support system 300 can generate a UWB radar signal in the form of a short pulse while changing the range of the UWB radar and output it through the provided transmission antenna (S601).

The sleep support system 300 may determine whether a UWB radar signal reflected by an object - that is, a passenger - exists (S602).

As a result of the determination, if the UWB radar signal reflected by the object is detected, the sleep support system 300 may calculate the absolute value a of the average change in breathing rate measured for each time section (S603).

The sleep support system 300 may compare a with a predetermined respiratory rate threshold (S604).

As a result of the comparison, if a is greater than the breathing rate threshold, the sleep support system 300 may calculate the variance value b of the occupant's position measured during a specific time (S605).

The sleep support system 300 may compare b with a predetermined position threshold (S606).

As a result of the comparison, if b is smaller than the location threshold, the sleep support system 300 may calculate the change amount c in the average heart rate measured for each time section (S607).

The sleep support system 300 may compare c with a predetermined heart rate threshold (S608).

As a result of the comparison, if c is less than the heart rate threshold - that is, when the occupant's heart rate is stabilized - the sleep support system 300 may determine that the occupant has entered a sleep state (S609).

If a is below the respiratory rate threshold in step 604, b is above the position threshold in step 606, or c is above the heart rate threshold in step 608, the sleep support system 300 allows the occupant to be in a non-sleep state. It can be judged that it has entered.

The UWB radar-based infant sleep support method according to the above-described embodiment can play a sleep support sound source through a speaker corresponding to the infant's riding position, regardless of whether the infant or child enters a sleep state while driving the vehicle, regardless of whether the vehicle is stopped or parked. Not only can it effectively maintain infants' sleep, but it also has the advantage of maintaining infants' sleep without maintaining an idling state.

The steps of the method or algorithm described in connection with the embodiments disclosed herein may be implemented directly as hardware, software modules, or a combination of the two executed by a processor. Software modules may reside in a storage medium (i.e., memory and/or storage) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM.

An exemplary storage medium is coupled to a processor, the processor capable of reading information from and writing information to the storage medium. Alternatively, the storage medium may be integral with the processor. The processor and storage medium may reside within an application specific integrated circuit (ASIC). The ASIC may reside within the user terminal. Alternatively, the processor and storage medium may reside as separate components within the user terminal.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims (28)

In a method of supporting infant sleep in a vehicle,
Transmitting an Ultra Wideband (UWB) radar signal;
Receiving the UWB (Ultra Wideband) radar signal;
determining the status of the occupant based on the received UWB radar signal; and
outputting a sleep support sound source based on the determination result;
A method, wherein the state of the occupant includes a sleeping state and a non-sleeping state. According to paragraph 1,
A method in which the UWB (Ultra Wideband) radar signal is transmitted in the form of a short pulse while changing the range. According to paragraph 1,
The step of determining the status of the occupant based on the received UWB radar signal,
Method comprising measuring the occupant's breathing rate, location, and heart rate based on the received UWB radar signal. According to paragraph 3,
A method in which the status of the occupant is determined based on at least one of the amount of change in the average respiratory rate measured for each time section, the variance value of the position measured during a specific time, and the amount of change in the average heart rate measured for each time section. According to paragraph 4,
The conditions for determining the status of the passenger are:
A first condition in which the absolute value of the change in average respiratory rate measured for each time interval is greater than a predetermined respiratory rate threshold;
a second condition where the variance value of the position measured during a specific time is less than a predetermined position threshold; and
The third condition is that the amount of change in the average heart rate measured for each time section is less than a predetermined heart rate threshold.
Method, including. According to clause 5,
The method wherein the state of the occupant is determined to be the sleeping state based on all of the first to third conditions being satisfied. According to clause 5,
Based on any one of the first to third conditions not being satisfied, the state of the occupant is determined to be the non-sleep state. According to clause 5,
A method in which it is determined whether the second condition is satisfied based on the first condition being satisfied, and whether the third condition is satisfied is determined based on the second condition being satisfied. According to clause 8,
Based on the state of the occupant being the sleep state, displaying a pop-up window on a display provided to confirm to the driver whether the sleep support system is activated, wherein the sleep support system is activated by the driver. A method in which the sleep support sound source is output based on. According to paragraph 1,
The sleep support sound source includes white noise or a similar engine sound corresponding to RPM (Revolution Per Minute), and the sleep support sound source is maintained in the memory in the form of a wavetable. According to paragraph 1,
Further comprising identifying the location of the occupant, wherein the sleep assistance sound source is output through a speaker corresponding to the identified location of the occupant, and the sleep assistance sound source is output based on the location of the occupant being not identified. How to be interrupted. According to paragraph 1,
Further comprising comparing the remaining battery capacity of the vehicle with a predetermined battery threshold,
The method wherein the sleep assistance sound source is output based on the remaining battery amount being greater than the battery threshold, and the sleep assistance sound source is stopped based on the remaining battery amount being less than or equal to the battery threshold. According to paragraph 1,
The sleep support sound source is output when the occupant's state is the sleep state, but the output is stopped based on the occupant's state being switched from the sleep state to the non-sleep state. According to paragraph 1,
A method in which the output of the sleep support sound source is controlled according to the state of the occupant regardless of whether the vehicle is stopped or parked. A non-volatile computer-readable storage medium storing at least one computer program that, when executed by at least one processor, includes instructions that cause the at least one processor to perform infant sleep support operations,
The above operations are:
Transmitting an Ultra Wideband (UWB) radar signal;
Receiving the UWB (Ultra Wideband) radar signal;
determining the status of the occupant based on the received UWB radar signal; and
outputting a sleep support sound source based on the determination result;
A storage medium, wherein the state of the occupant includes a sleeping state and a non-sleeping state. In a sleep support system for vehicle occupants,
A UWB radar that transmits and receives ultra wideband (UWB) radar signals to measure the occupant's breathing rate, location, and heart rate; and
A sleep support device that determines the status of the occupant based on information received from the UWB radar and controls the output of a sleep support sound source based on the determination result.
A sleep support system, wherein the occupant's state includes a sleep state and a non-sleep state. According to clause 16,
A sleep support system in which the UWB radar changes the range of the UWB (Ultra Wideband) radar signal and transmits it in the form of a pulse. According to clause 16,
The sleep support device,
A sleep support system that determines the state of the occupant based on at least one of the amount of change in the average respiratory rate measured for each time section, the variance value of the position measured during a specific time, and the amount of change in the average heart rate measured for each time section. According to clause 16,
The conditions for determining the status of the passenger are:
A first condition in which the absolute value of the change in average respiratory rate measured for each time interval is greater than a predetermined respiratory rate threshold;
a second condition where the variance value of the position measured during a specific time is less than a predetermined position threshold; and
The third condition is that the amount of change in the average heart rate measured for each time section is less than a predetermined heart rate threshold.
A sleep support system comprising: According to clause 19,
A sleep support system wherein the sleep support device determines the state of the occupant as the sleep state based on all of the first to third conditions being satisfied. According to clause 19,
A sleep support system wherein the sleep support device determines the state of the occupant as the non-sleep state based on any one of the first to third conditions not being satisfied. According to clause 19,
A sleep support system in which the sleep support device determines whether the second condition is satisfied based on the first condition being satisfied, and determines whether the third condition is satisfied based on the second condition being satisfied. . According to clause 16,
The sleep support device controls a pop-up window to be displayed on a display for the driver to check whether the sleep support system is activated based on the occupant's state being the sleep state, and the sleep support device controls the display to display a pop-up window to the driver. A sleep support system that controls the sleep support sound source to be output based on activation of the sleep support system. According to clause 16,
The sleep support sound source includes white noise or a similar engine sound corresponding to RPM (Revolution Per Minute), and the sleep support sound source is maintained in a memory provided in the form of a wavetable. According to clause 16,
The sleep support device identifies the location of the occupant, outputs the sleep support sound source through a speaker provided corresponding to the identified location of the occupant, and uses the sleep support sound source based on the fact that the location of the occupant is not identified. Sleep support system with output interruption. According to clause 16,
It further includes a battery management system that provides status information of the battery provided in the vehicle,
The sleep support device compares the remaining battery capacity of the vehicle with a predetermined battery threshold, and controls the sleep support sound source to be output based on the remaining battery amount being greater than the battery threshold, and the remaining battery amount is greater than the battery threshold. A sleep support system that stops output of the sleep support sound source based on the following. According to clause 16,
The sleep support sound source is output when the state of the occupant is the sleep state, but the output is stopped based on the state of the occupant being switched from the sleep state to the non-sleep state. According to clause 16,
A sleep support system in which the output of the sleep support sound source is controlled according to the status of the occupant regardless of whether the vehicle is stopped or parked.