KR20100041932A - Unmanned automatic electric vehicle and control method thereof - Google Patents

Abstract

PURPOSE: An unmanned electric cart and a control method thereof are provided to reduce the time and the manpower required for transferring the electric cart to a destination location. CONSTITUTION: An unmanned electric cart comprises a body(100), a driving part, a steering part(300), a power supply unit, a controller(500), a manipulation part(600) and a sensor unit(700). The driving part drives wheels using an electric motor. The power supply unit supplies the power to the electric motor. The controller controls the drive and steering of the electric cart. The manipulation part comprises a driving mode selecting unit which selects either a manual driving mode or an unmanned automatic driving mode. The sensor unit remotely detects the operation of the operator and transfers information on whether to be driven and the driving direction of the electric cart to the controller.

Description

Unmanned Automatic Electric Vehicle and Control Method Thereof}

The present invention relates to a control method of an unmanned electric transport vehicle and an unmanned electric transport vehicle, in detail, the operator does not directly drive the electric transport vehicle, the electric transport vehicle does not move along a predetermined path, human body current collector sensor, microwave A sensor unit including a Doppler sensor, an ultrasonic sensor, and an infrared light sensor relates to an unmanned electric vehicle and its control method capable of remotely driving an electric vehicle by detecting an operation of an operator.

When harvesting crops in a plastic house or field, a prime mover-type compact truck or battery that can move back and forth between the fields to eliminate the inconvenience of moving the harvested crops to a basket, etc. to a location where the tiller or tractor can access them. Mounted electric work trucks, etc. have been developed, but the work car as described above had a lot of inconvenience because the worker picked up all the crops and the worker is driving the car directly to transport the harvested crops again. If there are enough workers, the driver and harvester share their work so that they can work efficiently even with the existing work car.However, when there is a shortage of rural manpower, the unmanned electric transport can be driven unmanned automatically by following the harvester. The car is absolutely necessary.

Existing unmanned electric transport vehicles are a means of unmanned transfer of goods, and it is a device that safely moves objects such as products or parts to other places without the operator driving them directly. RGV (Rail Guided Vehicle) to move along the road, AGV (Automatic Guided Vehicle) to move the designated path with a magnetic, etc. with its own driving force. The unmanned electric transport vehicle as described above should be installed in advance in the movement path in the work space, or the movement path must be assigned to the magnetic path along the movement path, so it can be effectively used in the case of having a repetitive work path in a certain work space. However, if the working space is not fixed, such as when harvesting crops in a plastic house or a field, or if the working path is changed irregularly, a lot of costs and inconveniences are incurred in installing a rail or designating a moving path with a magnetic. There is a problem that cannot use the unmanned electric vehicle as described above.

In order to solve the above problems, the first object of the present invention is to directly drive an electric transporter or move the electric transporter according to a predetermined path, but not including a human body current collecting sensor, a microwave doppler sensor, an ultrasonic sensor, and an infrared ray. It is an object of the sensor unit including an optical sensor to detect the operation of the operator to provide an unmanned electric vehicle that can remotely drive the electric vehicle.

A second object of the present invention is to provide a control method that can conveniently and safely drive an unmanned electric transport vehicle using the detection value of the sensor unit including a human body current collecting sensor, a microwave Doppler sensor, an ultrasonic sensor and an infrared light sensor. do.

In order to achieve the first object of the present invention described above, the unmanned electric transport vehicle according to the present invention includes a vehicle body including a carrying handle, a loading box for loading an object, a wheel installed under the loading box; A driving unit for driving wheels using one or a plurality of electric motors; A steering unit which varies a moving direction of the electric vehicle; A power supply unit for supplying power to the electric motor; A control unit controlling driving and steering of the electric vehicle; An operation unit for commanding forward, backward, left turn or right turn of the electric transport vehicle; A sensor unit including a human body current collecting sensor, a microwave doppler sensor, an ultrasonic sensor, and an infrared light sensor; And a driving state display unit including a display unit or a voice output unit.

The vehicle body portion of the present invention is configured to include a handle for carrying, a loading box for loading an object, a wheel installed under the loading box. The carrying handle is used when the operator operates the electric vehicle directly.The brake handle is installed to operate the brake installed on the driving wheel.If the user wants to stop the electric vehicle urgently during manual operation, The carriage can be mechanically stopped. The loading box is provided with a space portion for accommodating the transport object. A plurality of wheels is installed at the bottom of the loading box, preferably three or four wheels are installed. It is divided into a driving wheel driven by an electric motor and a driven wheel which does not transmit driving force. In case of consisting of three wheels, auxiliary wheels can be installed to secure driving safety of the electric transport vehicle, and if the road surface is severely curved during driving or if the balance of the electric transport vehicle is disturbed due to overloading, Auxiliary wheels installed at the bottom automatically descend to prevent overturning, allowing safe driving regardless of road conditions.

The driving unit of the present invention includes one or more electric motors installed in the lower part of the vehicle body and a reducer, a gear, a chain belt, and the like for transmitting the rotational force of the electric motor, to transfer the driving force to the driving wheel. In some cases, the electric motor may be directly connected to the drive wheel.

The steering unit of the present invention may be configured in various ways depending on the configuration of the driving unit. When the driving unit drives two wheels by using one electric motor, and consists of one driven wheel, a steering motor may be installed on the driven wheel to steer the electric transport vehicle. When the driving unit is configured by connecting two electric motors directly to the driving wheels, the electric vehicle may be steered by controlling the rotation speed and the direction of each electric motor.

The power supply unit of the present invention supplies power to the driving unit, the steering unit, the control unit, and other parts (accessory unit), and is configured by installing a storage battery in the vehicle body portion.

The operation unit of the present invention is installed on the carrying handle can select the operation method of the electric transport vehicle manual or unmanned automatic method, when the user manually operates the electric transport vehicle, forward, backward, left turn, right turn of the electric transport vehicle Alternatively, a button is installed to command the stop. It is also possible to install a seat that can be seated on the upper side of the truck according to the driver's choice.

The control unit of the present invention controls the operation of the drive unit, steering unit and other parts (accessory unit) of the electric transport vehicle according to the input signal of the operation unit or sensor unit, and if there is a risk of falling of the electric transport vehicle while driving, driving the auxiliary wheels, The operation state signal of the electric vehicle is transmitted to the driving state display unit.

The sensor unit of the present invention detects the heat emitted from the human body, infrared sensor for collecting infrared rays, microwave doppler sensor for detecting the movement of the object by using the wavelength difference between the microwave and the microwave reflected from the object, and the ultrasonic radiation to the space Ultrasonic sensors that operate by receiving the reflected ultrasonic waves and the infrared rays are emitted using a sensor such as an infrared light sensor that emits infrared light and can measure the distance by reflection from an object. The sensor unit is fixedly attached to an upper portion of the vehicle body to detect a user's motion and transmit a signal to the controller.

Other parts (equipment parts) are equalizers, horns, air conditioners, and lowering of the loading box. In addition, the vehicle body portion of the present invention is provided with a driving state display unit for the operating state of the electric vehicle can transmit the operating state of the electric vehicle to the operator. The driving state display unit may be used as a display unit for indicating the operation state by color or text, or a voice output unit for displaying the operation state by voice output.

In addition, the driving wheel of the present invention is provided with a circular iron plate formed with a hole along the circumferential direction, and a high frequency sensor is installed at a position corresponding to the hole of the circular iron plate of the vehicle body portion, when the electric transport vehicle does not exceed the obstacle, the control unit is powered By comparing the signal transmitted to the motor with the number of revolutions of the driving wheel detected by the high frequency sensor, it is possible to prevent the damage of the electric motor by cutting off the power output of the electric motor so that the motor is not overloaded.

Referring to the method of controlling the electric transport by detecting the operation of the operator to achieve the second object of the present invention.

When the operation method of the electric transport vehicle is selected as the unmanned automatic operation, each sensor of the sensor unit waits in the initial state.

First, the human body current collecting sensor detects whether the electric transport vehicle may malfunction when the microwave Doppler sensor detects the movement of non-living objects other than the human body, and detects whether the operator is within the detection range and transmits it to the controller to prevent this. do.

The microwave Doppler sensor detects a change in the operator's motion and recognizes the operator's forward, backward, left turn, right turn or stop commands, and transmits it to the controller.

The ultrasonic sensor detects the distance to the operator and delivers it to the controller.

When all of the sensed values recognized by the sensors are normally transmitted to the controller, the controller controls the driving unit and the steering unit so that the electric transport vehicle can reach the desired position by the operator.

If even one of the detected values of each sensor does not satisfy the driving condition, the controller instructs the operation state display unit to display it, and each sensor returns to the initial state.

 If the infrared light sensor detects another worker or object before reaching the position commanded by the controller, the controller stops the motorized vehicle and collides with another worker or object while the motorized vehicle is normally driven by detecting the operation of the worker. To prevent.

The hand gesture transmitted by the operator to the sensor unit is based on a hand signal indicating normal forward, backward, leftward or rightward direction, and in some cases, the sensor unit detects the hand gesture of the operator indicating forward, backward, leftward, rightward or stop in advance. By storing the detected result in the control unit, the sensor unit can recognize the operation of the operator more accurately.

As described above, in the unmanned electric vehicle according to the present invention, the operator does not directly drive the electric vehicle, or the electric vehicle does not move along a predetermined path, and the sensor unit remotely drives the electric vehicle by detecting the operation of the operator. Since the worker can handle the two actions at the same time by loading and transporting the harvested crops to the electric transporter, the electric transporter can reach the electric transporter from the place where the worker was working during the harvesting work. This not only saves time and manpower to get to the destination, but also increases work efficiency by reducing work fatigue.

In addition, in the unmanned electric transport vehicle according to the present invention, if the road surface is severely curved during driving, or if the balance of the electric transport vehicle is disturbed by overloading, the auxiliary wheel installed in the lower part of the vehicle body automatically descends to prevent overturning. As a result, safe driving is possible regardless of road conditions.

In addition, the unmanned electric transport vehicle according to the present invention cuts off the power output to the electric motor by determining that the high frequency sensor installed in the wheel does not count the number of perforations of the circular steel plate when the electric motor is overloaded and does not cross the obstacle. This can provide an economic advantage that can be used for a long time without damaging the electric motor.

In the control method of the unmanned electric vehicle according to the present invention, the operator can manually or unmanned automatic control of the electric vehicle as needed, and can control the driving of the electric vehicle only by the operator's hand during unmanned automatic control. When obstacles appear during automatic driving and there is a risk of collision, the vehicle can be detected and emergency stop of the electric transport vehicle can be ensured for driving safety.

In addition, by storing the hand movements of the operator indicating the forward, backward, left, right, or stop recognized by the sensor unit in advance, the sensor unit may more accurately detect the operator's movement.

Hereinafter, an unmanned electric vehicle and a control method thereof capable of remotely driving an electric vehicle by detecting an operation of an operator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of an unmanned electric vehicle according to the first embodiment of the present invention, Figure 2 is a cross-sectional view of the unmanned electric vehicle according to the first embodiment of the present invention.

1 and 2, the unmanned electric vehicle according to the first embodiment includes a vehicle body part 100, a driving part 200, a steering part 300, a power supply part 400, an operation part 500, and a control part 600. , The sensor unit 700 and the driving state display unit 800 are configured.

In more detail, the vehicle body part 100 of the first embodiment includes a carrying handle 22, a loading box 25 for loading an object, two driving wheels 20 and one driven wheel installed under the loading box. 21).

The carrying handle 22 is used when the operator manually operates the electric transport vehicle, and the brake handle 23 is installed to operate the brake 29 installed on the driving wheel 20. When the vehicle is to be stopped, the electric transport vehicle can be mechanically stopped by releasing the brake knob 23.

The loading box 25 is provided with a space portion to accommodate the transport object.

In addition, one or a plurality of auxiliary wheels 34 are installed at the lower portion of the vehicle body 100 to secure driving safety of the electric vehicle, and measure the distance to the ground on the left and right sides of the driven wheel 21. When the horizontal detection sensor 32 including the ultrasonic distance measuring sensor 5 is installed, and the left and right distance difference from the ground measured by the ultrasonic distance measuring sensor 5 is more than a predetermined value, the auxiliary wheel 34 automatically descends. To prevent overturning of the electric transport vehicle, and if it is determined that the level is made after a predetermined time, the auxiliary wheel 34 is automatically raised to secure steering of the electric transport vehicle. In some cases, the horizontal detection sensor 32 may include a three-axis accelerometer to detect an acceleration change at the moment when the vehicle body 100 is inclined to more accurately determine whether the vehicle body is overturned or not. In addition, according to the driver's choice it can be controlled to lower or raise the auxiliary wheel manually or automatically in accordance with the load change of the load box.

A mechanical actuator or a load cell may be installed to control the auxiliary wheel to be lowered or hoisted manually or automatically.

By installing a headlight (lighting) 6 in the body portion 100, it is possible to make a safe driving at night driving, it is possible to facilitate the work by illuminating the work space during the night work.

The driving unit 200 of the first exemplary embodiment includes a reduction gear 26, a gear 28, and a chain belt for transmitting rotational force of one electric motor 9 and the electric motor 9 installed at the lower portion of the vehicle body 100. It is configured to include a 18 to transfer the driving force to the drive wheel (20).

In addition, when the driving wheel 20 is provided with a circular iron plate formed with a hole along the circumferential direction, and the high frequency sensor 31 is installed at a position corresponding to the hole of the circular iron plate of the vehicle body part, the electric transport vehicle does not pass the obstacle, The control unit 600 compares the signal transmitted to the electric motor 9 with the rotational speed of the driving wheel 20 detected by the high frequency sensor 31 so that the overload does not occur in the electric motor 9. By blocking the power output of the furnace to prevent damage to the electric motor (9).

The steering part 300 of the first exemplary embodiment is configured by installing a steering motor 33 on the driven wheel 21.

The power supply unit 400 of the first exemplary embodiment is configured by installing the storage battery 10 in the lower portion of the vehicle body portion 100, and supplies power required for each component.

The driving state display unit 800 of the first exemplary embodiment is configured by installing the display unit 8 and the speaker 35 on the upper portion of the vehicle body part 100. The display unit 8 indicates whether the sensor unit 700 normally detects an operator's operation signal and outputs the driving signal transmitted from the control unit 600 to the driving unit 200 to the display unit 8 to indicate the operating state of the electric vehicle. Mark it so that the operator can know it. When the sensor unit 700 does not normally receive the operator's operation signal or an abnormality occurs during the driving of the electric vehicle, the voice output unit 7 notifies the operator of the abnormal state by the voice signal, and the voice output unit 7 Is configured to generate a single sound signal, or to send an abnormal signal to the operator through the speaker 35, the voice synthesis output signal as needed.

The sensor unit 700 of the first exemplary embodiment is configured by using the sensors of the microwave Doppler sensor 1, the ultrasonic sensor 2, the infrared light sensor 3, and the human body detecting infrared ray collecting sensor 4. The sensor unit is fixedly attached to an upper portion of the vehicle body to detect a user's motion and transmit a signal to the controller. The sensor unit 700 is configured to attach the permanent magnet 14 so that the user of the electric transport vehicle can be easily installed, or to fix and attach the rotation fixing table 17 that can be freely positioned in a desired direction.

Figure 3 shows the configuration of the operation unit 500 of the first temporary example, a manual or unmanned automatic driving method selection button and the forward, backward, left turn, right turn, stop button is provided, the speed regulator for adjusting the running speed of the electric transport vehicle (24) is provided, in consideration of the work space and road surface conditions are configured so that the operator can limit the running speed of the electric transport vehicle.

Preferably, a remote controller 36 having a function of selecting a manual or unmanned automatic driving method and a function of stopping the driving of an electric transportation vehicle in an emergency can be selected, so that the operation method of the electric transportation vehicle can be selected at a long distance. In emergency situation, the electric vehicle can be stopped.

4 is a block diagram showing the configuration of the control unit 600 of the first temporary example. First, the controller 600 determines a manual or unmanned automatic driving method according to an input of a driving method selection button of the operation unit 500 or a driving method selection from the remote controller 36. In the case of manual operation, the operation of the driving unit 200 and the steering unit 300 is controlled according to the input signal of the forward, backward, left turn, right turn or stop buttons, and in the case of unmanned automatic driving, The operation of the driving unit 200 and the steering unit 300 is controlled according to the operation signal. The traveling speed of the electric transport vehicle is determined by the input value of the speed regulator 24 installed in the operation unit 500.

The operation signal of the operator detected by the control unit 600 and the operation state of the electric transport vehicle commanded to the driving unit 200 and the steering unit 300 by the control unit 600 is output through the display unit 8, the operator in the sensor unit If the operation signal of the normal detection or the driving of the electric transport is not made normally generates a warning sound to the operator through the voice output (7).

In addition, the controller 600 detects that the infrared light sensor 3 of the sensor unit 700 is close to another worker or an object on the driving path while driving, or when an emergency stop signal is transmitted from the remote controller 36, the electric transportation You can safely drive the electric transport vehicle by stopping the car running.

In addition, the control unit 600 outputs a command for lowering the auxiliary wheel 34 to the ground when the electric transport vehicle sensed by the horizontal detection sensor 32 while driving.

In addition, the operator stores the hand movements of the operator indicating forward, backward, left turn, right turn, or stop recognized by the sensor unit 700 in advance in the control unit 600, so that the sensor unit 700 detects the operator's motion more accurately. can do.

5 is a cross-sectional view of an unmanned electric vehicle according to a second embodiment of the present invention.

In the driving unit 200 of the second exemplary embodiment, an electric motor 9 having a reduction gear 26 connected to each of the two driving wheels 20 is installed. The steering unit 300 of the second exemplary embodiment is implemented by controlling the rotational speed of the left and right driving wheels 21 in the control unit 600.

Other components of the second temporary embodiment are the same as those of the first embodiment.

6 is a flowchart illustrating an unmanned automatic control method of an unmanned electric vehicle of the present invention.

Referring to Figure 6 looks at the unmanned automatic control method of the unmanned electric transport vehicle of the present invention.

First, the human body sensing current sensor 4 determines whether the operator is within the detection range. It is a step to prevent malfunction of the electric transport vehicle by detecting the movement of non-living objects other than the human body.

When the human body current collecting sensor 4 determines that the operator is within the detection range, the microwave Doppler sensor 1 detects a change in the operator's motion and recognizes the operator's forward, backward, left turn, right turn or stop commands, and the control unit ( 600).

If it is not determined that the human body current collecting sensor 4 is the human body, the sensor unit 700 waits in an initial state and re-detects the signal of the sensor unit.

When determining the driving direction of the electric transport vehicle, the ultrasonic sensor 2 detects the distance to the operator, and transmits it to the control unit 600.

 When the microdoppler sensor 1 does not determine the driving direction of the electric transport vehicle, the sensor unit 700 waits in an initial state and re-searches the signal of the sensor unit.

When the distance to the operator is determined, the controller 600 controls the driving unit 200 and the steering unit 300 to reach the position intended by the operator, and to reach the position intended by the operator commanded by the controller 600. When the all infrared light sensor 3 detects another worker or object, the control unit 600 stops the electric transport vehicle to prevent a collision.

Next, the driving method of the unmanned auto transport vehicle according to the present invention will be described.

First, when the unmanned automatic driving of the electric transport vehicle, the operation method selection switch of the operation unit 500 or the remote controller 36 installed on the carrying handle 22 is automatically switched.

When a worker remotely gestures a forward movement of the electric vehicle toward the sensor unit 700 of the electric vehicle by the hand gesture, the sensor unit 700 detects the hand movement of the operator and transmits a forward signal of the electric vehicle to the controller 600. The control unit 600 controls the electric motor 9 to advance the electric transport vehicle.

When the operator wants to change the route during the forward driving of the electric transporter, the operator instructs the left or right turn of the electric transporter by hand gestures, and the sensor unit 700 detects the hand movement of the operator and the control unit 600 controls the movement of the electric transporter. The left or right turn signal is transmitted, and the controller 600 controls the electric motor 9 or the steering motor 33 to rotate the electric transport vehicle to the left or right.

When the electric transport vehicle reaches the desired position by the operator, the operator instructs to stop the electric transport vehicle by hand gestures, and the sensor unit 700 detects the hand movement of the operator and transmits a stop signal of the electric transport vehicle to the controller 600. The control unit 600 controls the electric motor 9 to stop the electric transport vehicle.

When reversal of the electric vehicle is required, the operator instructs to reverse the electric vehicle with a hand gesture, and the sensor unit 700 detects the hand movement of the operator and transmits the reverse signal of the electric vehicle to the control unit 600, and the control unit. 600 controls the electric motor 9 to reverse the electric transport vehicle.

When the operator wants to operate the electric vehicle manually, the operator manually switches the operation method 500 or the operation method selector switch of the remote controller 36 installed on the carrying handle 22 and is installed on the operation unit 500. Press the forward, backward, left turn, right turn or stop buttons to operate the electric vehicle.

When the operator wants to stop the electric vehicle urgently during manual operation, the electric vehicle may be mechanically stopped by removing the brake knob 23 provided on the carrying handle 22.

In the above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be.

  1 is a perspective view of an unmanned electric transport vehicle according to a first embodiment of the present invention

  2 is a cross-sectional view of an unmanned electric vehicle according to the first embodiment of the present invention.

  3 is a configuration diagram of an operation unit of a first exemplary embodiment of the present invention;

  4 is a block diagram of a controller of a first exemplary embodiment of the present invention;

  5 is a cross-sectional view of an unmanned electric vehicle according to a second embodiment of the present invention.

  6 is a flowchart illustrating a control method of the unmanned electric vehicle of the present invention.

<Description of the symbols for the main parts of the drawings>

  100: vehicle body portion 200: drive portion 300: steering portion

  400: power supply unit 500: operation unit 600: control unit

  700: sensor unit 800: driving state display unit

  1: Microwave Doppler Sensor 18: Chain Belt 35: Speaker

  2: ultrasonic sensor 19: wheel rotation fixing 36: remote controller

  3: infrared light sensor 20: driving wheel

  4: human body infrared sensor 21: driven wheel

  5: ultrasonic distance measuring sensor 22: carrying handle

  6: headlight 23: brake handle

  7: Voice output 24: Speed controller

  8: display section 25: loading box

  9: electric motor 26: reducer

  10: storage battery 27: steering wheel

  11: microcontroller 28: power train

  12: hand 29: brake

  13: electric vehicle 30: 3-axis accelerometer

  14: permanent magnet 31: high frequency sensor

  15: motor driver 32: level sensor

  16: Control box 33: steering motor

  17: rotating arm 34: auxiliary wheel

Claims (14)

A body part including a carrying handle, a loading box for loading an object, and a wheel installed under the loading box; A driving unit for driving wheels using one or a plurality of electric motors; A steering unit which varies a moving direction of the electric vehicle; A power supply unit for supplying power to the electric motor; A control unit controlling driving and steering of the electric vehicle; An operation unit for a worker to select whether the electric vehicle runs or not; In the electric transport vehicle containing, The operation unit further includes a driving method selection unit for selecting a manual or unmanned automatic driving method of the electric vehicle; The electric transport vehicle further includes a sensor unit for detecting the operation of the operator at a long distance and transmitting the driving whether and the driving direction of the electric transport vehicle to the controller; The controller controls the driving unit and the steering unit according to the driving signal of the electric vehicle sensed by the sensor unit so that the operator can reach the desired position, so that the operator can directly drive the electric vehicle, or the path in which the electric vehicle is predetermined. Unattended electric transport vehicle, characterized in that the electric transport vehicle can be controlled at a long distance by moving the electric transport vehicle forward, backward, left turn, right turn or stop according to the operation of the operator sensed by the sensor unit without moving a certain section accordingly. The method of claim 1, The sensor unit detects the heat emitted from the human body, the infrared ray collecting sensor, the microwave Doppler sensor for detecting the movement of the object by using the wavelength difference between the microwave and the microwave reflected from the object, the ultrasonic radiation is reflected in the space Unmanned electric transport vehicle, characterized in that it comprises an ultrasonic sensor that operates by receiving the return ultrasonic waves and infrared light sensor that emits infrared light to measure the distance by the reflection from the object. The method according to claim 1 or 2, The driving unit is an unmanned electric transport vehicle comprising one electric motor, a gear and a chain belt for transmitting the rotational force of the reducer and the electric motor. The method according to claim 1 or 2, The driving unit is an unmanned electric transport vehicle, characterized in that the two electric motors are directly connected to each of the two wheels The method of claim 3, The steering unit is an unmanned electric transport vehicle, characterized in that the steering motor is installed on the wheel to which the driving force is not transmitted. The method of claim 3, The inner side of the wheel driven by the electric motor is provided with a circular iron plate formed with a hole in the circumferential direction, a high frequency sensor is installed at a position corresponding to the hole of the circular iron plate of the vehicle body portion, the signal to the control unit to rotate the electric motor If the wheel does not rotate even though the transmission, the unmanned electric transport vehicle, characterized in that to prevent the damage to the electric motor by cutting off the power output to the electric motor The method of claim 4, wherein The steering unit controls the rotational speed and direction of each electric motor to drive the electric transport vehicle, characterized in that steering The method according to claim 1 or 2, The lower portion of the body portion is provided with a horizontal sensor for sensing the level of the auxiliary wheel and the electric transport vehicle, when the electric transport inclined more than a predetermined value, the auxiliary wheel is automatically lowered to prevent the overturning of the electric transport vehicle. Unmanned electric transport vehicles The method of claim 8, The horizontal sensor is characterized in that the ultrasonic distance measuring sensor is attached to the lower left and right sides of the body part, and the degree of inclination of the electric transport vehicle is determined by comparing the difference of the distance from the ground measured by each ultrasonic distance measuring sensor. Unmanned electric transport vehicle The method according to claim 1 or 2, The unmanned electric transport vehicle further includes a driving state display unit configured to display a driving state of the electric transport vehicle, whether the sensor unit is normally detected at the upper part of the vehicle body, and to transmit an alarm to an operator when the driving or detection is abnormal. The method of claim 10, The driving state display unit is an unmanned electric transport vehicle, characterized in that the display unit for transmitting information using a text or light or a voice output unit for transmitting information using a voice signal. The method according to claim 1 or 2, The electric vehicle has a remote controller including a button for the operator to select a manual or unmanned automatic operation method and a button for stopping the driving of the electric vehicle in an emergency, it is possible to select the operation method of the electric vehicle at a long distance, Unmanned electric transport vehicle, characterized in that emergency stop the electric transport vehicle in an emergency situation A body part including a carrying handle, a loading box for loading an object, and a wheel installed under the loading box; A driving unit for driving wheels using one or a plurality of electric motors; A steering unit which varies a moving direction of the electric vehicle; A power supply unit for supplying power to the electric motor; A control unit controlling driving and steering of the electric vehicle; An operation unit capable of selecting a manual or unmanned automatic driving method of the electric transport vehicle and manipulating a driving direction; In the control method of the unmanned electric transport vehicle comprising a; a sensor unit including a human body current collecting sensor, a microwave Doppler sensor, an ultrasonic sensor and an infrared light sensor, Selecting one of a manual or an unmanned automatic operation as a driving method of the electric vehicle; Determining whether the human body current collecting sensor is within a detection range when the driving method is an unmanned automatic operation; Recognizing a change in the operator's motion by the micro Doppler sensor recognizes the operator's forward, backward, left turn, right turn or stop command; Detecting, by the ultrasonic sensor, a distance from the worker; And determining, by the control unit, the driving direction of the electric transport vehicle by combining the detection values of the human body current collecting sensor, the micro doppler sensor, and the ultrasonic sensor. The method of claim 13, After the step of determining the driving direction of the electric transport vehicle, if the infrared light sensor detects another worker or object before the electric transport vehicle reaches the position commanded by the controller while driving to prevent collision by emergency stop the electric transport vehicle The control method of the unmanned electric transport vehicle further comprising the step

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