KR20170079229A - Industrial embedded device using Low-Power Technology - Google Patents

Industrial embedded device using Low-Power Technology Download PDF

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Publication number
KR20170079229A
KR20170079229A KR1020150189576A KR20150189576A KR20170079229A KR 20170079229 A KR20170079229 A KR 20170079229A KR 1020150189576 A KR1020150189576 A KR 1020150189576A KR 20150189576 A KR20150189576 A KR 20150189576A KR 20170079229 A KR20170079229 A KR 20170079229A
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state
user
ready
sensor
power
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KR1020150189576A
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Korean (ko)
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홍원기
차경애
이도경
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대구대학교 산학협력단
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Priority to KR1020150189576A priority Critical patent/KR20170079229A/en
Priority to PCT/KR2015/014549 priority patent/WO2017115891A1/en
Publication of KR20170079229A publication Critical patent/KR20170079229A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3231—Monitoring the presence, absence or movement of users
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Power Sources (AREA)

Abstract

An industrial embedded device includes an ultrasonic sensor for measuring a distance from a user and a human body sensor for detecting the movement of the user, and the initial state (Not Intent) according to the measurement results of the ultrasonic sensor and the human body sensor ), The ready state (Ready), the standby state (Standby), and the operation state (Run), and controls the power state of the display unit, the communication unit, the sensor unit, and the central control unit in accordance with the corresponding states .

Description

[0001] The present invention relates to an industrial embedded device using a low-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial embedded device, and more particularly, to an industrial embedded device to which low power technology is applied.

Embedded devices are becoming more sophisticated and equipped with a variety of external devices such as motors, sensors, and displays, which are used in a variety of environments including medical, military, education, and shopping. As a result, embedded devices have to perform a lot of functions and power consumption is continuously increasing. In addition, as the proportion of battery-operated portable devices in the embedded device market continues to increase, the amount of power consumption has become an important issue. Since the power consumption is directly related to the operating time and service life of the device, researches on low power service to reduce the power consumption have been actively carried out.

Low power service research can be divided into hardware based, operating system based, and application software based. In the case of hardware, it is mainly applied to the design of equipment, such as using low power consumption parts, finishing the manufacturing process or adding circuit to cut off the clock supply to the unnecessary part or recycling the current. Typically, clock gating technique and charge recycling There is a technique.

The operating system is based on Dynamic Power Management (DPM) and Dynamic Voltage and Frequency Scaling (DVFS), which is a method to control device operation speed or power state during long idle time by analyzing and predicting idle time of device. Technique.

Finally, the application software base controls the power of the device by using and analyzing user control elements such as time or ambient brightness or peripheral information of the device. Application-based low-power services are more active than hardware-based or operating system-based services. Typical techniques include timeout techniques, user recognition techniques using cameras, and backlight illumination techniques using output images.

Conventional low power schemes are difficult to apply to various embedded devices with many characteristics and usage patterns, and even if they can be applied, power consumption reduction rate is not high. In the case of a user recognition technique using a camera, a camera is required as an external device, and a high performance CPU is required because a complex calculation is required for image analysis. DPM and DVFS are specialized in devices with a certain behavioral pattern because the operating system is necessary and the task prediction is required.

In particular, embedded devices used in the industrial field can not be applied to existing low-power techniques or can not be used for power reduction because the time required for the user to use the device is short, the minimum external device necessary for the function is attached, The effect is very minimal. Therefore, there is a need for techniques that can effectively reduce the power consumption of industrial embedded devices.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-described problems, and provides an industrial embedded device capable of reducing power consumption by changing the state of a power source of an internal device according to measurement results of an ultrasonic sensor and a human body sensor .

According to an embodiment of the present invention, an ultrasonic sensor for measuring a distance to a user is provided. (Not ready), a ready state (standby), and an operation state (operation state) according to a measurement result of the ultrasonic sensor and the human body sensor, And the power control unit controls the power state of the display unit, the communication unit, the sensor unit, and the central control unit according to the corresponding states.

In addition, when the user's motion is detected, the control unit maintains the initial state (Not Intent) when there is no movement of the user as a result of the detection of the human body sensor, Switched,

When the user approaches the reference distance in the preparation state (Ready) as a result of the measurement of the ultrasonic sensor, the state is changed from the ready state (Ready) to the standby state (Standby)

And is switched from the standby state to the operation state when the touch operation of the user is detected in the standby state.

In addition, when the ready state is maintained for a first time or longer, the state is changed from the ready state to the initial state (Not Intent).

If the touch operation of the user does not occur for more than a second time in the operation state Run, the operation mode is changed from the operation state Run to the standby state and the operation state Run or the standby state (Ready) from the operation state (Run) or the standby state (Standby) when the user moves beyond the reference distance in the stand-by state.

The industrial embedded device may further include a suspend state selected corresponding to the measurement results of the ultrasonic sensor and the human body detection sensor, wherein, when there is no movement of the user as a result of the detection of the human body sensor, (Not Intent) to the suspended state (Suspend) when the motion of the user is detected while maintaining the initial state (Not Intent) (Suspend) to the ready state (Ready), and if the movement of the user is not detected within the set time in the suspended state (Suspend), the initial state (Not Intent), and when the user is within the reference distance as a result of measurement by the ultrasonic sensor in the ready state (Ready) Is switched from the ready state to the standby state and is switched from the standby state to the operation state when the touch operation of the user is detected in the standby state. .

Also, when the ready state is maintained for a first time or longer, the state is changed from the ready state to the initial state (Not Intent).

If the touch operation of the user does not occur for more than a second time in the operation state Run, the operation mode is changed from the operation state Run to the standby state and the operation state Run or the standby state (Ready) from the operation state (Run) or the standby state (Standby) when the user moves beyond the reference distance in the stand-by state.

In addition, in the initial state (Not Intent), the display unit is turned off (TURN OFF), the communication unit is turned off (TURN OFF), the sensor unit is turned off (TURN OFF) (TURN OFF), the communication unit turns off the power (TURN OFF), the sensor unit turns off the power (TURN OFF), and the power supply unit turns off the power supply The central control unit maintains the sleep mode and in the standby state the display unit turns off the power and the communication unit turns on the power and the sensor unit turns on the power, The central control unit maintains a run mode and in the operation state the display unit turns on the power, the communication unit turns on the power, and the sensor unit turns on the power TURN ON), the central control unit operates in the run mode wherein the stop mode of the central control unit is a deep power down mode and the sleep mode of the central control unit is a power down mode, And the execution mode of the central control unit is a normal mode.

In the low power scheme proposed in this embodiment, additional power consumption occurs due to the use of the additional sensor, so that the average power consumption according to the user state is higher than the conventional scheme, but the time required for the average power consumption is reduced through user recognition, When the total power consumption of the time base was examined, the average power consumption was saved by 39.3% compared with the case where the low power technique was not used, and the power consumption reduction rate was 10.4% on average compared with the dead time technique.

1 is a configuration diagram of an industrial embedded device according to an embodiment of the present invention;
Figure 2 is a state transition diagram for the low power technology of the industrial embedded device of Figure 1;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention.

1 is a configuration diagram of an industrial embedded device according to an embodiment of the present invention.

The industrial embedded device according to the present embodiment includes only a simple structure for clearly explaining the technical idea to be proposed.

1, an industrial embedded device includes a human body detection sensor 100, an ultrasonic sensor 200, a communication unit 300, a sensor unit 400, a display unit 500, and a central control unit 600 .

The detailed configuration and main operation of the above-configured industrial embedded device will be described below.

First, an industrial embedded device is configured to control a production facility or the like for producing industrial equipment by using the communication unit 300, the sensor unit 400, the display unit 500, and the central control unit 600.

The display unit 500 may include a flat panel display module having a touch sensor, and the communication unit 300 may be connected to the production apparatuses to transmit control signals to the production apparatuses.

The sensor unit 400 may include at least one of an illuminance sensor, a position sensor, a flow rate sensor, a temperature sensor, a current and voltage sensor, and a proximity sensor, and may sense the operation of the production apparatus .

The central control unit 600 refers to a central processing unit (CPU) and can control the internal operation of the industrial embedded device.

The human body detection sensor 100 senses the movement of the user, and the ultrasonic sensor 200 measures the distance apart from the user. That is, the industrial embedded device according to the embodiment of the present invention proposes a user state recognition algorithm using the human body detection sensor 100 and the ultrasonic sensor 200 for a low power service and a low power service that varies power state according to the state .

That is, the user's motion information is collected using the human body detection sensor 100 and the distance between the user and the terminal is measured using the ultrasonic sensor to determine the presence or absence of the user and to provide various low power states according to the situation. The power consumption can be reduced without user inconvenience.

Industrial embedded devices are equipped with various hardware such as display, memory, and communication module, and it is best to include all of these hardware as a power control object. However, it is impossible to control the power of the hardware that always needs operation, because it increases the user inconvenience.

The ratio of power consumed by hardware included in the industrial embedded device is 43% for the communication unit 300, 25% for the display unit 500, and 12% for the central control unit 600, which accounts for 80% By controlling the power of each piece of hardware in accordance with the user condition, high power consumption reduction rate can be obtained without user inconvenience.

Therefore, in this embodiment, four hardware including the display unit 500, the communication unit 300, the central control unit 600, and the sensor unit 400, which have the highest power consumption among the hardware devices attached to the industrial embedded device, Power control target.

The display unit 500, the communication unit 300, and the sensor unit 400 perform power supply control in such a manner that power is cut off and supplied according to the user state. The display unit 500 is one of devices having a lot of power consumption, and it can reduce a lot of power without user inconvenience by turning on and off according to whether the device is used or not.

The communication unit 300 also cuts off the power to a device having high power consumption. If the power supply is cut off, unnecessary power consumption may occur while repeating the same process as the network initialization. However, since a large amount of power is used for maintaining the network, .

In the case of the sensor unit 400, although not consuming much power, it is possible to reduce the amount of power by applying the method of turning on and off depending on whether the device is used or not.

Since the central control unit 600 inconveniently does not operate the device when the power is shut down, it is not possible to control the power such that the power is cut off and supplied as in other devices. However, if the low power mode is used, Can be effectively reduced.

In this embodiment, the low power mode of the central control unit 600 includes a stop mode in which all functions of a peripheral in the chip such as a timer, a UART, and an internal memory are stopped,

A sleep mode in which only the control unit is stopped and the peripheral in the chip operates normally,

And a run mode in which all the functions inside the chip including the control unit operate normally.

That is, the stop mode of the central control unit 600 is a deep power down mode, the sleep mode of the central control unit 600 is a power down mode, The Run mode of the controller 600 is defined as a Nomal mode. Particularly, in the deep power down mode, the central control unit 600 operates only a minimum circuit for processing an interrupt signal for instructing switching to a power down mode and a normal mode.

Real Situation User State No user's motion in the workspace Not_Intent User's motion in the workspace
Distance between user and device Ready The setting distance <Distance between user and device Standby The use of device Run

Referring to Table 1, the situation that may occur in a work space in which an industrial embedded device is installed,

(1) No user movement in the workspace - Initial state (Not Intent, S10) -

(2) The user is moving in the workspace but the distance from the industrial embedded device is longer than the set distance. - Ready (S20)

(3) The distance between the user and the industrial embedded device is closer than the set distance. - Standby (S30)

(4) a situation where an industrial embedded device is used, and (4) an operation state (Run, S40).

2 is a state transition diagram for the low-power technology of the industrial embedded device of FIG.

Referring to FIG. 2, when the movement of the user is detected in a state where the distance of the industrial embedded device is longer than the set distance, the state starts from the initial state (Not Intent, S10) to the ready state (Ready, S20).

When the distance between the user and the industrial embedded device approaches the set distance to use the industrial embedded device, the standby state (Standby, S30) is changed from the ready state (Ready, S20).

Meanwhile, there is a pending state (Suspend, S11) between the initial state (Not Intent) and the ready state (Ready, S20), so that the user can detect the movement twice. Minimizes false state changes caused by small movements. Since a change in state due to an incorrect user analysis results in higher power consumption of the industrial embedded device, adding a suspend state (Suspend, S11) can prevent waste of power consumption due to erroneous state changes.

State transitions for low-power technologies in industrial embedded devices are described in more detail below.

The industrial embedded device may be configured to perform an initial state (Not Intent), a ready state (Ready), a ready state (S20), a standby state (Standby, S30), and an operation state (Run) according to the measurement results of the ultrasonic sensor (200) And S40 and controls the power state of the display unit 500, the communication unit 300, the sensor unit 400, and the central control unit 600 according to the corresponding states.

First, when the user's motion is detected, the initial state (Not Intent, S10) is maintained when there is no user's movement as a result of the detection of the human body detection sensor 100, S20).

Next, in the ready state (Ready, S20), when the user of the ultrasonic sensor 200 approaches within the reference distance, it is switched from the ready state (Ready, S20) to the standby state (Standby, S30).

Next, when the touch operation of the user is detected in the standby state (S30), the operation state is changed from the standby state (S30) to the operation state (Run, S40) (Run). At this time, the touch operation of the user is defined when the user touches the display unit 500, the switch, or the like to operate the industrial embedded device.

On the other hand, when the ready state (Ready, S20) is maintained for the first time (t1), the state is changed from the ready state (S20) to the initial state (Not Intent).

If the touch operation of the user does not occur for the second time t2 or more in the operation state (Run, S40), the operation state (Run, S40) is changed to the standby state (Standby, S30).

When the user moves beyond the reference distance in the operation state (Run, S40) or the standby state (Standby, S30), the operation state (Run, S40) or the standby state (Standby, S30) .

The industrial embedded device may further include a suspended state (Suspend) selected corresponding to the measurement results of the ultrasonic sensor 200 and the human body detection sensor 100,

If the user's movement is sensed, the initial state (Not Intent) (S10) is maintained in the suspended state (Suspend, S11) Lt; / RTI &gt;

When the user's movement is detected within the set time in the suspended state (Suspend, S11), the state changes from the suspended state (Suspend, S11) to the ready state (Ready, S20) If no motion is detected, it can be switched from the suspended state (Suspend, S11) to the initial state (Not Intent, S10).

Display Communication
Module External
Sensor CPU Not_Intent  OFF  OFF  OFF Stop Mode Ready  OFF  OFF  OFF Sleep Mode  Standby  OFF ON ON Run Mode Run ON ON ON Run Mode

Table 2 shows the power control target states according to the user state. In the initial state (Not Intent), the power of the communication unit 300 and the sensor unit 400 including the display unit 500 is cut off while the power is the least used, and the state of the central control unit 600 is the stop mode Stop mode.

The ready state is a state in which the display unit 500, the communication unit 300 and the sensor unit 400 are not operated but the central control unit 600 is changed to the sleep mode, to be.

The standby state is a state in which the central control unit 600 operates in the run mode and only the display unit 500 is turned off and the communication unit 300 and the sensor unit 400 are turned on, .

The last operation state Run is the most power consuming state since the central control unit 600 is in the run mode and power is supplied to both the display unit 500, the communication unit 300 and the sensor unit 400.

That is, in the initial state (Not Intent), the display unit 500 turns off the power, the communication unit 300 turns off the power, and the sensor unit 400 turns off the power. , The central control unit 600 maintains a stop mode.

In the ready state, the display unit 500 turns off the power, the communication unit 300 turns off the power, the sensor unit 400 turns off the power, The controller 600 maintains the sleep mode.

In the standby state, the display unit 500 is turned off, the communication unit 300 is turned on, the sensor unit 400 is turned on, and the central controller 600 ) Maintains a Run mode.

In the operation state Run, the display unit 500 turns on the power, the communication unit 300 turns on the power, the sensor unit 400 turns on the power, the central control unit 600, (Run mode).

As described above, the human body detection sensor 100 and the ultrasonic sensor 200 are used to recognize the user and distinguish the state. The human body detection sensor 100, which generates a pulse signal when a human body is detected, is attached to the upper center of the industrial embedded device to determine an initial state (Not Intent) and a ready state (Ready).

The recognition distance of the human body detection sensor 100 is up to 7 m and the recognition angle is 140 ㅀ, so that user movements in all directions can be recognized without recognizing blind spots based on the terminal. If the pulse signal is not output from the human body detection sensor 100, it is an initial state (Not Intent) in which there is no user in the work space or there is no movement of the user, and when the pulse signal is outputted, a ready state to be.

The human body detection sensor 100 detects not only large movements that occur when a user moves, but also fine movements that occur when a hand is used in place. If a state change occurs with a single motion detection, it can not accurately determine the state of the user, such as recognizing that the user is still in motion, as well as changing the state too frequently. Therefore, the human body detection sensor 100 minimizes the recognition error that can be caused by changing the state only when the motion is further detected within the set time t seconds when the user senses the movement of the user.

The ultrasonic sensor 200 is attached horizontally to the floor at the bottom center of the industrial embedded device and measures the distance between the user and the industrial embedded device. Then, the ultrasonic sensor 200 measures the distance between the user and the industrial embedded device and discriminates whether the user state is a ready state do. If the angle of the ultrasonic sensor 200 with respect to the object is less than 45 degrees, the sensor can not receive the reflected wave and can not measure the distance.

If the ultrasonic waves are adhered to the bottom, the distance may be smaller than the angle at which the distance can be measured according to the user's position. Therefore, in order to prevent this, it must be attached so that it is level with the floor. If the measured distance is shorter than the set distance, it is judged as a stand-by state (Standby) and the user is recognized as being in front of the apparatus. Conversely, if the measured distance is longer than the set distance, it is judged as ready (Ready) and the user is recognized as being far from the industrial embedded device.

The distance measurement using the ultrasonic sensor 200 frequently generates an error due to an irregular surface or an angle with respect to an object, thereby obtaining a different value from the actual distance. If the measurement uses the wrong value, the user state is judged incorrectly. Therefore, the user state is accurately judged by removing the erroneously measured value by applying the average value filtering technique. In the mean value filtering method, a filter is designed so that the distance values measured for a predetermined number of times are sorted in ascending order and then the average of the distance values except d max and d mins is used as the distance value.

&Quot; (1) &quot;

Figure pat00001

Figure pat00002

Figure pat00003

Figure pat00004

Low
Power
Scheme User
State Display CPU Communication,
External
Sensor PIR ,
Ultra
sonic
Sensor Power
Consumption (W) No low power
service RUN ON RUN MODE ON X 3.01 Time based low power service STANDBY OFF RUN MODE ON X 2.05 RUN ON RUN MODE ON X 3.01 User state
recognition
based
low power
service NOT INTENT OFF STOP MODE OFF O 1.68 READY OFF SLEEP MODE OFF O 1.92 STANDBY OFF RUN MODE ON O 2.39 RUN ON RUN MODE ON O 3.4

Table 3 shows the average power consumption according to the user state of various low power techniques. The central control unit 600 exhibits a minimum power consumption of 1.68 W in an initial state (Not Intent) in which the power of the communication unit and the sensor unit including the display unit is shut off.

The ready state in which the state of the central control unit 600 is changed from the stop mode to the sleep mode shows the power consumption of 1.92 W and the central control unit 600 is in the run mode And the power consumption in the standby state in which power is supplied to the communication unit and the sensor unit is 2.39 W, which is about 0.4 W more than the ready state.

The central control unit 600 consumes the largest amount of power in an operation state (Run) in which the central control unit 600 is in the run mode and supplies power to the communication unit and the sensor unit as well as the power supply of the display unit.

However, there is a difference in power consumption depending on the applied low power technique even though it is the same user state. In the case of the stand-by state, the dead time technique consumes 2.05 W of power, and in the case of the technique proposed in this embodiment, the average power consumption is 2.39 W. Also, in the case of the operation state (Run), the average power consumption is the same as 3.01W in the state in which the low power technique is not used or the dead time technique, but it is 3.4W in the case of the proposed technique. In both cases, when the same user state, the proposed scheme consumes about 0.3 W of power. This is caused by the human body sensor and the ultrasonic sensor used for user recognition.

In the low power scheme proposed in this embodiment, additional power consumption occurs due to the use of the additional sensor, so that the average power consumption according to the user state is higher than the conventional scheme, but the time required for the average power consumption is reduced through user recognition, When the total power consumption of the time base was examined, the average power consumption was saved by 39.3% compared with the case where the low power technique was not used, and the power consumption reduction rate was 10.4% on average compared with the dead time technique.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Human body sensor
200: Ultrasonic sensor
300:
400:
500:
600:

Claims (4)

An ultrasonic sensor for measuring a distance from the user; And
And a human body detection sensor for detecting movement of the user,
(Not Intent), a ready state (Ready), a standby state (Standby), and an operation state (Run) according to measurement results of the ultrasonic sensor and the human body sensor, A power supply state of the display unit, the communication unit, the sensor unit, and the central control unit,
And a suspended state (Suspend) selected corresponding to the measurement results of the ultrasonic sensor and the human body detection sensor,
If the motion of the user is detected, the control unit switches from the initial state (Not Intent) to the suspended state (Suspend) when the motion of the user is detected, while maintaining the initial state (Not Intent) ,
If the user's movement is detected within the set time in the suspend state, the state changes from the suspended state to the ready state (Ready), and the movement of the user within the set time in the suspended state (Suspend) (Not Intent) from the suspended state (Suspend) if not detected,
When the user approaches the reference distance in the preparation state (Ready) as a result of the measurement of the ultrasonic sensor, the state is changed from the ready state (Ready) to the standby state (Standby)
Wherein when the touch operation of the user is detected in the standby state, the operation mode is switched from the standby state to the operation state.
The method according to claim 1,
And the state is changed from the ready state to the initial state (Not Intent) when the ready state is maintained for a first time or more.
3. The method of claim 2,
The operation mode is changed from the operation state to the standby state when the user's touch operation does not occur for a second time or longer in the operation state Run, (Ready) from the operation state (Run) or the standby state (Standby) when the user moves beyond the reference distance.
The method according to claim 1,
In the initial state (Not Intent), the display unit is turned off (TURN OFF), the communication unit is turned off (TURN OFF), the sensor unit is turned off (TURN OFF) mode,
In the ready state, the display unit is turned off, the communication unit is turned off, the sensor unit is turned off, and the central control unit is in a sleep mode ),
In the standby state, the display unit is turned off, the communication unit is turned on, the sensor unit is turned on, and the central control unit is in a run mode. However,
In the operation state Run, the display unit turns on the power, the communication unit turns on the power, the sensor unit turns on the power, and the central control unit maintains the run mode In addition,
Wherein the stop mode of the central control unit is a deep power down mode and the sleep mode of the central control unit is a power down mode, And the Run mode is a Nomal mode.
KR1020150189576A 2015-12-30 2015-12-30 Industrial embedded device using Low-Power Technology KR20170079229A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220039461A (en) * 2020-09-22 2022-03-29 주식회사 유라코퍼레이션 Video recording system using vehicle and control method of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220039461A (en) * 2020-09-22 2022-03-29 주식회사 유라코퍼레이션 Video recording system using vehicle and control method of the same

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