KR20200027195A - Apparatus for measuring bio-signal of driver and method thereof - Google Patents

Abstract

According to the present invention, disclosed are an apparatus for measuring a bio-signal of a driver and a method thereof. The apparatus for measuring the bio-signal of the driver of the present invention includes: a radar sensor for measuring the bio-signal of the driver; a first inertial sensor attached to the radar sensor to measure the movement of the radar sensor; a second inertial sensor attached to a driver′s seat to measure driver′s movement; a vehicle speed sensor for measuring a vehicle speed; a control unit which calculates a vibration value based on the first inertial sensor, the second inertial sensor, and the vehicle speed sensor while all of the radar sensor, the first inertial sensor, the second inertial sensor, and the vehicle speed sensor are synchronized to remove the vibration value from the bio-signal measured from the radar sensor so that the control unit determines the bio-signal value; and an output unit for outputting the bio-signal value determined by the control unit.

Description

A device for measuring a biosignal of a driver and its method {APPARATUS FOR MEASURING BIO-SIGNAL OF DRIVER AND METHOD THEREOF}

The present invention relates to a device for measuring a biosignal of a driver and a method thereof, and more specifically, when measuring a biosignal of a driver through a radar, the relative noise of the sensor and the driver is minimized so that a continuous biosignal can be measured even while driving. It relates to an apparatus for measuring a biosignal of a driver and a method.

In general, the causes of traffic accidents may be related to various factors such as driver's carelessness or the occurrence of a sudden danger situation due to the road environment, but among them, the proportion of accidents due to speeding or drowsy driving tends to increase year by year. However, it is a serious social problem since most of the accidents lead to major accidents.

In an effort to solve this problem, major automobile manufacturers are continuously developing and applying various new systems to assist in the safe operation of vehicles.

On the other hand, in the conventional drowsy driving determination technology, it is mostly intended to determine whether the driver is drowsy by detecting the driver's condition based on a camera or monitoring the driver's pulse rate through a sensor or the like.

That is, in the former case, the driver's face is photographed through an indoor camera installed in the vehicle to determine the driver's eyelid opening / closing, blinking, and pupil movement, and determining whether or not drowsy driving is based on this.

In the latter case, it is determined based on the phenomenon that the driver's pulse rate decreases in the drowsiness state.

The background technology of the present invention is disclosed in Korean Patent Publication No. 0929621 (Announcement of December 31, 2009, Personal Emergency Alert System and Method).

As described above, when detecting a biosignal of a driver to determine a state of drowsy driving, the biggest obstacle is vibration noise generated in a vehicle environment.

Here, the vibration noise can be roughly classified into three types. The vibration noise of the vehicle body and the driving noise differently depending on the ground when driving are simultaneously applied to the sensor attached to the vehicle and the driver.

In addition, dynamic noise caused by the movement of the driver is minimized by limiting the radar projection range to the chest, but since the driver is not fixed to the seat, vibration and relative displacement of the vehicle occurs when driving.

Therefore, in the case of actually measuring a biosignal in a driving environment of a vehicle, the biosignal has a serious deformity due to the vehicle's own vibration and driving vibration, so that most of the data is unreliable.

The present invention has been devised to improve the above problems, and an object of the present invention according to an aspect is to minimize the relative noise between the sensor and the driver when measuring the biosignal of the driver through a radar, thereby providing a continuous biosignal even while driving. It is to provide a device and a method for measuring a biosignal of a driver that enables measurement.

An apparatus for measuring a biosignal of a driver according to an aspect of the present invention includes a radar sensor for measuring a biosignal of the driver; A first inertial sensor attached to the radar sensor to measure the movement of the radar sensor; A second inertial sensor attached to the driver's seat to measure the driver's movement; Vehicle speed sensor for measuring the vehicle speed of the vehicle; Vibration in the bio-signal measured from the radar sensor by calculating vibration values based on the first inertial sensor, the second inertial sensor, and the vehicle speed sensor while all of the radar sensor, the first inertial sensor, the second inertial sensor, and the vehicle speed sensor are synchronized. A control unit for determining a biosignal value by removing the value; And it characterized in that it comprises an output unit for outputting the bio-signal value determined by the control unit.

In the present invention, the control unit is characterized in that when the angular acceleration is measured from the first and second inertial sensors are invalidated.

In the present invention, the control unit receives the vehicle speed from the vehicle speed sensor, calculates the acceleration, determines the baseline, and then measures the relative vibration based on the acceleration values input from the first and second inertia sensors and applies the baseline. It is characterized by calculating the vibration value.

In the present invention, the control unit is characterized in that by removing the vibration generated in the frequency band through the FFT for the axis data in the longitudinal direction of the bio-signal measured in the radar sensor by applying the vibration value to the axis data in the longitudinal direction. do.

A method for measuring a biosignal of a driver according to another aspect of the present invention includes: a control unit synchronizing a radar sensor, a first inertial sensor, a second inertial sensor, and a vehicle speed sensor; The control unit receives a sensor value from a radar sensor, a first inertial sensor, a second inertial sensor, and a vehicle speed sensor; The control unit calculates a vibration value based on the first inertial sensor, the second inertial sensor, and the vehicle speed sensor; Determining, by the controller, a biosignal value by removing the vibration value from the biosignal measured from the radar sensor; And outputting the determined bio-signal value through the output unit by the control unit.

The present invention is characterized in that, in the step of receiving the sensor value, when the angular acceleration is measured from the first inertial sensor and the second inertial sensor, the controller invalidates and receives the input again.

In the present invention, calculating the vibration value includes: the controller receiving the vehicle speed from the vehicle speed sensor and calculating an acceleration to determine a baseline; And a control unit measuring relative vibration based on the acceleration values input from the first inertial sensor and the second inertial sensor and calculating a vibration value by applying a baseline.

In the present invention, the determining of the biosignal value is performed by the control unit removing and applying the vibration value to the axis data in the front-rear direction of the bio-signal measured by the radar sensor. Characterized in that the biosignal value is determined by removing the residual vibration.

The driver's bio-signal measuring apparatus and method according to an aspect of the present invention can continuously measure a reliable bio-signal while driving by minimizing the relative noise of the sensor and the driver when measuring the bio-signal of the driver through a radar. Make it possible to provide healthcare information to drivers.

1 is a block diagram showing a biosignal measurement device of a driver according to an embodiment of the present invention.
2 is a configuration diagram showing the arrangement state of the biosignal measurement device of the driver according to an embodiment of the present invention.
3 is a flowchart illustrating a method for measuring a biosignal of a driver according to an embodiment of the present invention.

Hereinafter, an apparatus and method for measuring a biosignal of a driver according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition of these terms should be made based on the contents throughout the present specification.

1 is a block diagram showing a biosignal measuring device of a driver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an arrangement state of a biosignal measuring device of a driver according to an embodiment of the present invention.

1 and 2, the driver's bio-signal measuring apparatus according to an embodiment of the present invention includes a radar sensor 10, a first inertial sensor 20, a second inertial sensor 30, and a vehicle speed sensor. 40, a control unit 50 and an output unit 60 may be included.

The radar sensor 10 may detect a change in the chest of the driver and measure a biosignal such as a pulse or breath and provide it to the controller 50.

The first inertial sensor 20 may be attached to the radar sensor 10 and measure the movement of the radar sensor 10 due to vibration generated during driving of the vehicle and provide it to the control unit 50.

The second inertial sensor 30 may be attached to the driver's seat 70 to measure the change due to the driver's movement along with the vibration of the vehicle and provide it to the controller 50.

Here, the first inertial sensor 20 and the second inertial sensor 30 are composed of a 3-axis acceleration sensor and a gyroscope sensor, as well as detecting movement in three axes of front, rear, left, and up and down, as well as pitch and roll ( 3-axis rotation of roll and yaw can be detected.

The vehicle speed sensor 40 measures the vehicle speed of the vehicle and provides it to the control unit 50 to determine the driving acceleration as a baseline, thereby correcting the acceleration values of the first inertial sensor 20 and the second inertial sensor 30 Make it possible to calculate the vibration value.

The control unit 50 is a radar sensor 10, the first inertial sensor 20, the second inertial sensor 30 and the vehicle speed sensor 40 in a state in which all of the first inertial sensor 20, the second inertial sensor The vibration value may be calculated based on the 30 and the vehicle speed sensor 40 to remove the vibration value from the bio signal measured from the radar sensor 10 to determine the bio signal value.

At this time, when the angular acceleration is measured from the first inertial sensor 20 and the second inertial sensor 30, the control unit 50 may deem the signal as warped and invalidate it and receive the input again.

In addition, the control unit 50 receives the vehicle speed from the vehicle speed sensor 40, calculates the acceleration, determines the baseline, and then based on the acceleration values input from the first inertial sensor 20 and the second inertial sensor 30. You can measure the vibration and calculate the vibration value by applying the baseline.

Subsequently, the control unit 50 removes the radar sensor 10 by applying a vibration value to the axis data in the front-rear direction of the bio-signal measured and dividing a certain time for the axis data in the up-down, left-right direction, and then converting the FFT to the FFT By removing residual vibrations generated in the frequency band, a biosignal value can be determined.

The output unit 60 outputs the biosignal value determined by the control unit 50.

As described above, according to the driver's bio-signal measuring apparatus according to an embodiment of the present invention, when measuring the bio-signal of the driver through a radar, the relative noise of the sensor and the driver is minimized to continuously provide a reliable bio-signal even while driving. It can be measured to provide health information to the driver.

3 is a flowchart illustrating a method for measuring a biosignal of a driver according to an embodiment of the present invention.

As shown in FIG. 3, in the method for measuring a biosignal of a driver according to an embodiment of the present invention, first, the controller 50 includes a radar sensor 10, a first inertial sensor 20, and a second inertial sensor 30. And to synchronize the vehicle speed sensors 40 so that data can be processed at the same time (S10).

After synchronizing the sensors in step S10, the control unit 50 receives sensor values from the radar sensor 10, the first inertial sensor 20, the second inertial sensor 30, and the vehicle speed sensor 40 (S20). .

That is, the radar sensor 10 receives a biosignal such as a pulse or breath that detects a driver's chest change, and the first inertial sensor 20 attached to the radar sensor 10 generates during driving of the vehicle. It receives the movement of the radar sensor 10 due to vibration, and the second inertial sensor 30 attached to the driver's seat 70 receives the vibration of the vehicle and changes due to the driver's movement, and the vehicle speed sensor ( 40) receives the vehicle speed according to the driving of the vehicle.

After receiving the sensor value in step S20, the control unit 50 determines whether angular acceleration is generated from the measured values input from the first inertial sensor 20 and the second inertial sensor 30 (S30).

If it is determined in step S30 that the angular acceleration has occurred, and if it is determined that the angular acceleration has occurred, the controller 50 regards the signal as warped and invalidates it, returns to step S20, and receives the sensor value again.

On the other hand, if the angular acceleration is not generated in step S30, the control unit 50 calculates the acceleration from the vehicle speed input from the vehicle speed sensor 40 to determine a baseline for calculating the basic vibration value according to the driving of the vehicle. (S40).

After determining the baseline in step S40, the control unit 50 performs relative vibration by the first inertial sensor 20 attached to the radar sensor 10 and the second inertial sensor 30 attached to the driver's seat 70. Measure (S50).

Subsequently, the control unit 50 determines the baseline of the vibration value according to the driving of the vehicle in step S40, and measures the relative vibrations of the first inertial sensor 20 and the second inertial sensor 30 in step S50 to the 3 axis. The vibration value is calculated as a vector value (S60).

After calculating the vibration value in step S60, the controller 50 removes the vibration value according to the driving environment of the vehicle with respect to the biosignal measuring the heart rate or breathing based on the change in the chest of the driver input from the radar sensor 10. (S70).

In step S70, the control unit 50 removes the radar sensor 10 by applying a vibration value to the axial data of the biosignal measured in the front-rear direction, and dividing a certain time for the axial data in the up-down, left-right direction, and then converting the FFT (Fast Fourier Transform). ) To remove the residual vibration generated in the frequency band.

After removing the vibration value from the signal measured from the radar sensor 10 in step S70, the controller 50 may determine the biosignal based on reliable data (S80).

After determining the bio-signal in step S80, the control unit 50 outputs the bio-signal through the output unit 60 (S90).

As described above, according to the method for measuring a biosignal of the driver according to an embodiment of the present invention, when measuring the biosignal of the driver through a radar, the relative noise of the sensor and the driver is minimized to continuously provide a reliable biosignal while driving. It can be measured to provide health information to the driver.

The present invention has been described with reference to the embodiment shown in the drawings, but this is merely exemplary, and those skilled in the art to which the art belongs can various modifications and equivalent other embodiments from this. Will understand.

Therefore, the true technical protection scope of the present invention should be defined by the following claims.

10: radar sensor 20: first inertial sensor
30: second inertial sensor 40: vehicle speed sensor
50: control unit 60: output unit
70: sheet

Claims (8)

A radar sensor for measuring a biosignal of the driver;
A first inertial sensor attached to the radar sensor to measure the movement of the radar sensor;
A second inertial sensor attached to the driver's seat to measure movement of the driver;
Vehicle speed sensor for measuring the vehicle speed of the vehicle;
The radar is calculated by calculating vibration values based on the first inertial sensor, the second inertial sensor, and the vehicle speed sensor while all of the radar sensor, the first inertial sensor, the second inertial sensor, and the vehicle speed sensor are synchronized. A control unit for determining a biosignal value by removing a vibration value from the biosignal measured from a sensor; And
And an output unit for outputting the bio-signal value determined by the control unit.
According to claim 1, The control unit, the bio-signal measuring device of the driver, characterized in that when the angular acceleration is measured from the first inertial sensor and the second inertial sensor.
The relative vibration based on the acceleration values input from the first inertial sensor and the second inertial sensor after determining the baseline by calculating the acceleration by receiving the vehicle speed from the vehicle speed sensor. And measuring the vibration value by applying the baseline and measuring the biosignal measuring device of the driver.
The method according to claim 1, wherein the control unit removes the vibration value by applying the vibration value to the axial data in the front-rear direction measured by the radar sensor, and generates the data in the frequency band through FFT for the axial data in the up-down, left-right direction. A driver's bio-signal measuring device, characterized by removing residual vibrations.
A step in which the control unit synchronizes all of the radar sensor, the first inertial sensor, the second inertial sensor, and the vehicle speed sensor;
The control unit receiving sensor values from the radar sensor, the first inertial sensor, the second inertial sensor, and the vehicle speed sensor;
The controller calculating a vibration value based on the first inertial sensor, the second inertial sensor, and the vehicle speed sensor;
Determining, by the controller, a biosignal value by removing the vibration value from the biosignal measured by the radar sensor; And
And outputting the bio-signal value determined by the control unit through the output unit.
The method for measuring a biosignal of a driver according to claim 5, wherein in the step of receiving the sensor value, when the angular acceleration is measured from the first inertial sensor and the second inertial sensor, the controller invalidates and receives the input again. .
The method of claim 5, wherein the calculating of the vibration value comprises: the control unit receiving a vehicle speed from the vehicle speed sensor and calculating an acceleration to determine a baseline; And
And the controller controlling the relative vibration based on the acceleration values input from the first inertial sensor and the second inertial sensor and applying the baseline to calculate the vibration value. Signal measurement method.
The method of claim 5, wherein in the determining of the biosignal value, the controller applies and removes the vibration value to the axis data in the front-rear direction of the bio-signal measured by the radar sensor and removes it. A method for measuring a biosignal of a driver, characterized by determining the biosignal value by removing residual vibration generated in a frequency band through FFT.

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