KR102107976B1 - Sensing device to detect children leaving alone in the vehicle - Google Patents

Abstract

A device for detecting neglected children in a vehicle is characterized by comprising: a vehicle starting detecting sensor which detects a started state of a vehicle; an entrance door detecting sensor which detects the opened and closed state of the entrance door of the vehicle; a movement detecting sensor which detects the movement of a child on board the vehicle by using the Doppler effect; a warning output means which outputs a warning through light and sound; and a main control unit which controls the motion of the warning output means based on the detection result of the vehicle starting detecting sensor, the entrance door detecting sensor, and the movement detecting sensor, and controls such that the warning output means may output a warning when a movement is detected inside the vehicle after a predetermined time from the point in which the entrance door of the vehicle is converted into the closed state in a state in which the engine of the vehicle is turned off. Therefore, the reliability of the device can be increased.

Description

Sensing device to detect children leaving alone in the vehicle}

The present invention relates to a child protection device, and more particularly, to a child neglect detection device in a vehicle.

A child who was left in a kindergarten school bus in a heat wave in his mother area is still unable to find consciousness. In the United States, an average of 38 accidents are reported each year in which children left in cars are killed. The reason for this accident is that the temperature inside the car rises very quickly compared to the temperature outside the car.

1 is a view showing a change in temperature inside a vehicle, and FIG. 2 is a view showing the cause of a child heat stroke death.

1 and 2, the reason why the temperature rise in the vehicle is suddenly due to the greenhouse effect. The temperature inside the car rises rapidly as the heat energy entering the windshield cannot escape the vehicle.

CNN reported that even on a day of 24 degrees Celsius, the temperature inside the car reached 32 degrees in 2 minutes, and after 20 minutes it rose to 40 degrees, and after an hour it soared to 49 degrees. The Washington Post quoted a study by Professor Jang Null of the Department of Meteorology at San Jose State University and said that when the car door is locked, it rises by an average of 4.4 degrees in 30 minutes. On a 30-degree Celsius day, the temperature inside the car can rise to 68 degrees.

Also, the rapid temperature rise in the car occurs regardless of the outside temperature. Indeed, heat stroke deaths in automobiles are still occurring in the United States in the middle of December to February.

The problem is that when the body temperature reaches 40 degrees, heat stroke occurs. Children are especially at risk because their body temperature rises three to five times faster than adults. In fact, children's heat stroke deaths in automobiles were the most common in children in the United States. Of the 683 children who died of heat stroke in children from 1998 to this year in the United States, the number of children who died was 198, the most common. The number of accidents among children between 1 and 2 years old was 142, and 126 accidents between 2 and 3 years old. 68% of the victims were children under 3 years old.

For this reason, the American Safety Association recommends that children should never be left in the car for a while, regardless of weather or season. It was analyzed that more than half of the accidents of children who were left in the car were caused by the carelessness of parents or guardians. 28% were because the child locked the car by himself, such as when the child accidentally pressed the lock. Only 17% of people deliberately left children in cars.

Conventionally, a method of sensing a human body using an infrared sensor was mainly used. However, in the case of an infrared sensor, it is reliable in an indoor environment, but in the outdoors, there are many disadvantages of malfunction due to environmental factors such as sunlight and temperature change.

KR 10-2012-0108621 A

The present invention has been proposed to solve the above technical problem, and provides a device for detecting children's neglect in a vehicle that can improve reliability by being less affected by climate change using a motion sensor using a Doppler effect.

According to an embodiment of the present invention for solving the above problems, a vehicle start detection sensor for detecting a starting state of a vehicle, a door detection sensor for detecting an opening / closing state of a vehicle door, and a Doppler effect are used in the vehicle. The motion detection sensor detects the movement of a child on board, a warning output means for outputting a warning through light and sound, and the warning output based on the detection results of the vehicle start detection sensor, the door detection sensor and the motion detection sensor Controls the operation of the means, but controls to output a warning through the warning output means when a movement is detected inside the vehicle after a predetermined time from the time when the vehicle door is switched to the closed state when the vehicle start is turned off. It provides a device for detecting children's neglect in a vehicle including a main control unit.

In addition, in the present invention, the vehicle start detection sensor, the door detection sensor, the motion detection sensor and the main control unit is characterized in that the data exchange using a wireless communication method or a wireless communication method.

In addition, the vehicle start detection sensor included in the present invention is characterized in that it detects the start state based on the power supply state of the vehicle's always-on power terminal and the vehicle's start-up power terminal.

In addition, the door detection sensor is arranged in the vehicle door, it is characterized in that it detects the opening and closing state of the vehicle door by sensing the pressure according to the open state and the closed state.

In addition, further comprising; a temperature sensor for sensing the temperature inside the vehicle, the main control unit is characterized in that it controls to output a warning through the warning output means only when the temperature value of the temperature sensor is greater than or equal to a predetermined value do.

The device for detecting children's neglect in a vehicle according to an embodiment of the present invention may improve reliability by being less affected by climate change by using a motion sensor using a Doppler effect.

That is, the children's neglect detection device in the vehicle is less affected by climate and day and night environment changes, and can sense the human body in a non-contact manner, and has the advantage of adjusting the sensing distance by adjusting the output.

1 is a view showing the temperature change inside the vehicle
2 is a view showing the cause of death in children's heat stroke
3 is a block diagram of a child neglect detection device in a vehicle according to an embodiment of the present invention
4 is a configuration diagram of the outside of the vehicle of the child neglect detection device in the vehicle
5 is a configuration diagram of the inside of the vehicle of the child neglect detection device in the vehicle
6 is a block diagram of a motion detection sensor
Figure 6a is a diagram showing the concept of the Doppler effect and the configuration of the receiver.
Figure 6b is a configuration diagram of the sensor using the Doppler effect
Figure 6c is a view showing the concept of using an intermediate frequency
7 is a block diagram of a child neglect detection device in a vehicle according to another embodiment of the present invention

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings in order to describe in detail that a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention.

3 is a block diagram of a child neglect detection device 1 in a vehicle according to an embodiment of the present invention.

The child neglect detection device 1 in the vehicle according to the present embodiment includes only a brief configuration for clearly explaining the technical idea to be proposed.

Referring to FIG. 3, the child neglect detection device 1 in the vehicle includes a vehicle start detection sensor 100, a door detection sensor 200, a motion detection sensor 300, a warning output means 500, and a main control unit 600. It is configured to include.

Looking at the main operation of the child left detection device 1 in the vehicle configured as described above is as follows.

The vehicle start detection sensor 100 detects the starting state of the vehicle.

Basically, the vehicle start detection sensor 100 may detect the start state based on the power supply state of the vehicle's regular power terminal and the vehicle's start power terminal.

The constant power terminal is a terminal to which power of the battery is continuously supplied even when the start is turned off, and the start power terminal is defined as a terminal to which power is supplied only when the start is maintained and to cut off the power supply when the start is turned off. Therefore, the vehicle start detection sensor 100 may identify the starting state of the vehicle in consideration of the difference between the voltage of the constant power terminal and the voltage of the starting power terminal.

The door detection sensor 200 detects the opening and closing state of the vehicle door.

The door detection sensor 200 may be composed of at least one pressure sensor, which is disposed on the door of the vehicle and detects the pressure according to the open and closed states to detect the opening and closing state of the door. For reference, the door detection sensor 200 may be configured using an infrared sensor.

The motion sensor 300 detects the motion of a child riding inside the vehicle using the Doppler effect. The detailed configuration and operation description of the motion detection sensor 300 will be described later.

The warning output means 500 outputs a warning to the outside of the vehicle through lights and sounds. In this embodiment, the warning output means 500 is provided with a warning light 510 and a speaker 520, it may be installed on the upper outside of the vehicle. At this time, the vertical height of the warning light 510 may automatically increase gradually in proportion to the warning time. In addition, the speaker 520 is provided with a plurality of directional speakers, and may be configured to output a warning sound while rotating 360 degrees.

The main control unit 600 controls the operation of the warning output means 500 based on the detection results of the vehicle start detection sensor 100, the door detection sensor 200, and the motion detection sensor 300, while the vehicle start is turned off. When a movement is detected inside the vehicle after a predetermined time from the time when the vehicle door is switched to the closed state, it is controlled to output a warning through the warning output means 500.

That is, the child's neglect detection device 1 in the vehicle moves the occupant (child) in the motion detection sensor 300 after a predetermined time from the time when the occupant (child) gets off and the vehicle is all off while the vehicle start is off. When this is detected, it is determined that the child is left inside the vehicle, and a warning is output through the warning output means 500.

For reference, the vehicle start detection sensor 100, the door detection sensor 200, the motion detection sensor 300, and the main control unit 600 are preferably configured to exchange data using a wireless communication method. The wireless communication method may be a Bluetooth communication method, a WiFi communication method. At this time, the detection sensor 100, the door detection sensor 200, the motion detection sensor 300 and the main control unit 600 may be configured to exchange data using a wired communication method.

4 is a configuration diagram of the outside of the vehicle of the child neglect detection device in the vehicle.

Referring to Figure 4, the warning output means 500 is provided with a warning light 510 and a speaker 520, it may be installed on the upper outside of the vehicle.

The vertical height of the warning light 510 may automatically increase gradually in proportion to the warning time. In addition, the speaker 520 is provided with a plurality of directional speakers, and may be configured to output a warning sound while rotating 360 degrees.

For reference, a smoke generating unit may be further provided in the warning output means 500. If the warning light is not released even though the warning light 510 and the speaker 520 operate for a predetermined time or longer, the smoke generating unit automatically operates to automatically emit smoke of a predetermined color.

5 is a configuration diagram of the inside of the vehicle of the child neglect detection device in the vehicle.

Referring to FIG. 5, the door detection sensor 200 is disposed on the door, and the motion detection sensor 300 is disposed behind the driver's seat to detect the direction of movement of the occupant.

The motion detection sensor 300 is disposed immediately behind the driver's seat and around the rearmost seat to measure motion simultaneously in the front and rear directions and transmit motion information to the main controller 600. At this time, the main control unit 600 collects information from both sensors and determines that a person is located inside the vehicle only when motion is simultaneously detected.

6 is a configuration diagram of a motion detection sensor, and Table 1 is a table showing features of the motion detection sensor.

<Table 1>

6 and Table 1, the motion detection sensor is configured to detect motion using the Doppler effect. The ultra-high frequency signal of 10.525 GHz is used to accurately and reliably detect minute movements of the target regardless of the external environment such as temperature, humidity and dust. In addition, the motion detection sensor is configured to adjust the sensing distance by adjusting the frequency or output power.

6A is a diagram showing the concept of the Doppler effect and the configuration of a receiver, 6B is a diagram showing the configuration of a sensor using the Doppler effect, and FIG. 6C is a diagram showing the concept of using an intermediate frequency.

A sensor using the Doppler effect will be described with reference to FIGS. 6A to 6C as follows.

The frequency of the signal reflected from a moving object with a constant period remains the same, but the phase changes with time. The phase change of the transmission line with load is shown in the figure. The phase that changes over time is proportional to the displacement x (t).

When the magnitude of the displacement is less than the magnitude of the wavelength, the phase change is small. And the phase modulated signal is demodulated by a mixer that merges with the original signal. The demodulation signal is proportional to the displacement of the object.

When the wave source approaches (away from) an observer who is stationary with respect to the medium, the frequency of the wave source is n, the observed frequency is n ', and the wave propagation velocity is V, because the wave is compressed (enlarged) in the traveling direction. If the velocity of the motion is v, the following relationship is established.

After synthesizing the signal considering the Doppler effect on a moving object, the overall Doppler frequency of the target signal modified in the frequency domain is obtained. The frequency received by the actual receiver is as follows.

The movements of objects perceived by the sensor (objects facing the sensor and objects away from the sensor have different frequencies and are distinguished from each other) can be calculated with the desired value to obtain the information we want.

Looking at the configuration diagram of the microwave Doppler detection sensor based on the Doppler theory, when the microwave signal hits a moving object, the frequency of this signal changes due to the Doppler effect. If motion occurs, there is a phase change of the microwave signal according to the motion. The phase change is proportional to the displacement of the object.

To detect this phase modulated signal, the signal is detected by a transceiver. The return signal is merged with the sample of the transmission signal and the mixer, because the magnitude of the phase change between the signal to be moved and the signal to be returned is expressed as an output voltage proportional to it.

At this time, the signal uses two antennas to separate the transmission signal (TX Antenna) and the reception signal (RX Antenna).

The signal received using a part of the local oscillator, which is a transmission signal, is down-converted to the baseband. Since high-frequency signals such as RF signals are difficult to process, converting them to intermediate-frequency (IF) signals can be easily extracted without losing the information that the original RF signal has. In order to generate a signal of an intermediate frequency containing an RF signal, if a signal having a difference of a desired intermediate frequency is mixed with the RF signal (IF Mixer), an IF signal can be obtained from the output.

For fine displacements, the frequency of this baseband signal is directly proportional to the displacement of the moving object, and the phase noise of the local oscillator is one of the reasons that degrades the sensitivity of the system.

Since the size of the baseband signal is proportional to the phase of the microwave input signal, the phase noise of the microwave input signal increases the noise level of the output signal. However, since the oscillator or the local oscillator generating the transmission signal is the same, there is a correlation between the received signal and the phase noise of the local oscillator signal. And the correlation level related to the time delay is changed by the size and frequency difference of the moving object.

7 is a block diagram of a child neglect detection device 2 in a vehicle according to another embodiment of the present invention.

The child neglect detection device 2 in the vehicle according to the present embodiment includes only a brief configuration for clearly explaining the technical idea to be proposed.

Referring to FIG. 7, the child neglect detection device 2 in the vehicle includes a vehicle start detection sensor 100, a door detection sensor 200, a motion detection sensor 300, a temperature sensor 400, and a warning output means 500 And a main control unit 600.

Looking at the main operation of the child's neglect detection device 2 in the vehicle configured as described above is as follows.

The vehicle start detection sensor 100 detects the starting state of the vehicle.

Basically, the vehicle start detection sensor 100 may detect the start state based on the power supply state of the vehicle's regular power terminal and the vehicle's start power terminal.

The constant power terminal is a terminal that continuously supplies power to the battery even when the start is turned off, and the start power terminal is defined as a terminal that is supplied with power only when the start is maintained and cut off when the start is turned off. Therefore, the vehicle start detection sensor 100 may identify the starting state of the vehicle in consideration of the difference between the voltage of the constant power terminal and the voltage of the starting power terminal.

In addition, the vehicle start detection sensor 100 may connect to the vehicle's On Board Diagnostics (OBD) terminal to obtain information about the current state of the vehicle to detect the start state of the vehicle.

In addition, the vehicle start detection sensor 100 is composed of a vibration sensor to identify the vibration pattern of the engine to detect the maintenance state of the vehicle start.

The door detection sensor 200 detects the opening and closing state of the vehicle door.

The door detection sensor 200 may be composed of at least one pressure sensor, which is disposed on the door of the vehicle and detects the pressure of the open and closed states to detect the opening and closing state of the door. For reference, the door detection sensor 200 may be configured using an infrared sensor.

In addition, the door detection sensor 200 may connect to the vehicle's On Board Diagnostics (OBD) terminal to obtain information about the current state of the vehicle to detect the open / closed state of the door.

In addition, the door detection sensor 200 may be configured to detect the opening and closing state of the vehicle door based on the power supply state of the vehicle's always-on power terminal and the vehicle's door lock power terminal.

The motion sensor 300 detects the motion of a child riding inside the vehicle using the Doppler effect. The detailed configuration and operation description of the motion detection sensor 300 will be described later.

The warning output means 500 outputs a warning to the outside of the vehicle through lights and sounds. In this embodiment, the warning output means 500 is provided with a warning light 510 and a speaker 520, it may be installed on the upper outside of the vehicle. At this time, the vertical height of the warning light 510 may automatically increase gradually in proportion to time. In addition, the speaker 520 is provided with a plurality of directional speakers, and may be configured to output a warning sound while rotating 360 degrees.

The main control unit 600 controls the operation of the warning output means 500 based on the detection results of the vehicle start detection sensor 100, the door detection sensor 200, and the motion detection sensor 300, while the vehicle start is turned off. When a movement is detected inside the vehicle after a predetermined time from the time when the vehicle door is switched to the closed state, it is controlled to output a warning through the warning output means 500.

That is, the child's neglect detection device 1 in the vehicle moves the occupant (child) in the motion detection sensor 300 after a predetermined time from the time when the occupant (child) gets off and the vehicle is all off while the vehicle start is off. When this is detected, it is determined that the child is left inside the vehicle, and a warning is output through the warning output means 500.

Meanwhile, the child neglect detection device 2 in the vehicle may further include a temperature sensor 400 that senses the temperature inside the vehicle. The temperature sensor 400 is preferably a non-contact type sensor.

At this time, the main control unit 600 may control to output a warning through the warning output means 500 only when the temperature value of the temperature sensor 400 is greater than or equal to a predetermined value. For example, the warning output means 500 may be set to operate only when a time in which the temperature inside the vehicle exceeds 40 degrees is maintained for a predetermined time or longer. At this time, the excess temperature can be set by the user.

For reference, the vehicle start detection sensor 100, the door detection sensor 200, the motion detection sensor 300, and the main control unit 600 are preferably configured to exchange data using a wireless communication method. The wireless communication method may be a Bluetooth communication method, a WiFi communication method.

In addition, the warning output means 500 may be further provided with a smoke generating unit. If the warning light is not released even though the warning light 510 and the speaker 520 operate for a predetermined time or longer, the smoke generating unit automatically operates to automatically emit smoke of a predetermined color. At this time, when the smoke of a predetermined color is automatically ejected, the seat belt may be automatically released only when the seat belt inside the vehicle is automatic. If there is no smoke generating unit, even if the warning light 510 and the speaker 520 operate for a predetermined time or longer, and the warning is not released, the seat belts of all seats may be automatically released.

According to another embodiment of the present invention, a child neglect detection device in a vehicle may improve reliability by being less affected by climate change by using a motion sensor using a Doppler effect.

That is, the children's neglect detection device in the vehicle is less affected by climate and day and night environment changes, and can sense the human body in a non-contact manner, and has the advantage of adjusting the sensing distance by adjusting the output.

As such, those skilled in the art to which the present invention pertains will appreciate that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. do.

100: vehicle start detection sensor
200: door detection sensor
300: motion detection sensor
400: temperature sensor
500: warning output means
510: warning light
520: speaker
600: main control

Claims (6)

A vehicle start sensor for detecting a starting state of the vehicle;
A door detection sensor that detects an opening / closing state of a vehicle door;
A motion detection sensor that detects a child's motion inside the vehicle using a Doppler effect;
Warning output means for outputting a warning through light and sound; And
Control the operation of the warning output means based on the detection results of the vehicle start detection sensor, the door detection sensor and the motion detection sensor, but a predetermined time from the time when the vehicle door is switched to the closed state when the vehicle start is off And a main control unit controlling to output a warning through the warning output means when a movement is detected inside the vehicle afterwards.
The warning output means is installed on the upper outside of the vehicle and the vertical height gradually increases in proportion to the warning time warning light; And a smoke generating unit that automatically ejects smoke of a predetermined color when the warning light is not released even if the warning light is operated for a predetermined time or longer.
The motion detection sensor is installed in the rear of the driver's seat and the rearmost, respectively, to measure motion simultaneously in the forward and rear directions. Child neglect detection device in a vehicle, characterized in that it is determined that the location.
According to claim 1,
The vehicle start detection sensor, the door detection sensor, the motion detection sensor and the main control unit for children's neglect detection device in a vehicle, characterized in that the data exchange using a wireless communication method or a wired communication method.
According to claim 1,
The vehicle start sensor,
Children's neglect detection device in the vehicle, characterized in that for detecting the starting state based on the power supply state of the vehicle's regular power terminal and the starting power terminal of the vehicle.
According to claim 1,
The door detection sensor,
A device for detecting children's neglect in a vehicle, characterized in that it is arranged at the door of the vehicle and detects the pressure in accordance with the open state and the closed state to detect the open and closed state of the vehicle door.
According to claim 1,
The door detection sensor,
Children's neglect detection device in the vehicle, characterized in that for detecting the opening and closing state of the vehicle door on the basis of the power supply state of the vehicle's always-on power terminal and the vehicle's door lock power terminal.
According to claim 1,
Further comprising; a temperature sensor for detecting the temperature inside the vehicle,
The main control unit is to control the child's neglect detection device in the vehicle, characterized in that to control the output of the warning through the warning output means only when the temperature value of the temperature sensor is above a predetermined value.

Images