KR101034202B1 - Refrigerator and Control Method thereof - Google Patents

Abstract

The present invention relates to a refrigerator and a control method thereof, and more particularly, to a refrigerator having a door opening device for easily opening a door and a control method thereof.

To this end, the door opening device of the refrigerator according to the present invention can perform the opening of the door only by the operation of the drive motor rotates a predetermined section in one direction, and becomes the initial state even if the driving motor does not operate in the reverse direction after the opening of the door, Even when the first door and the second door are opened continuously, both doors can be opened only by the forward and reverse rotation of the drive motor, thereby minimizing the control of the drive motor and extending the life of the drive motor and related parts. It has an effect.

In addition, the refrigerator and the control method according to the present invention detects the position of the rotary cam during the initial power input or during operation to determine whether the door opening device is broken, and operates for a predetermined time at the initial detection of the position of the rotary cam. By forcibly rotating the motor, it is possible to prevent the drive motor from malfunctioning due to a chattering phenomenon of the motor driver.

Description

Refrigerator and Control Method

1 is a perspective view showing a refrigerator to which a door opening device according to the present invention is applied.

Figure 2 is an exploded perspective view of the door opening apparatus according to an embodiment of the present invention.

Figure 3 is a plan view of a refrigerator to which the door opening apparatus according to an embodiment of the present invention is applied, showing a state in which the door is closed.

4 is a plan view of a refrigerator to which a door opening device is applied according to an embodiment of the present invention, and shows a state in which the first door is opened by the door opening device.

5 is a plan view of a refrigerator to which a door opening device is applied according to an embodiment of the present invention, and illustrates an operation of returning an operation member of the door opening device to an initial position.

6 is a plan view of a refrigerator to which a door opening device is applied according to an embodiment of the present invention, and shows a state in which the second door is opened by the door opening device.

7 is a block diagram showing the operation control of the door opening apparatus according to an embodiment of the present invention.

8 is a flowchart illustrating an initial failure diagnosis method of a door opening apparatus according to an exemplary embodiment of the present invention.

9 is a flowchart illustrating a control method of a door opening apparatus according to an embodiment of the present invention.

Description of the Related Art [0002]

16, 17: switch unit 20: door opening device

30: operating member 40: rotary cam

41: protrusion 42: spacing

50: drive motor 100: control unit

110: position detection device 120: door open sensor

The present invention relates to a refrigerator and a control method thereof, and more particularly, to a refrigerator having a door opening device for easily opening a door and a control method thereof.

In general, a large refrigerator requires a large force to open the door because the door to open and close the storage compartment is large. This is because the weight of the door is not only heavy but also the pressure difference between the inside and outside of the storage chamber is caused by the temperature drop of the storage compartment when it is operated. Therefore, recently, such a refrigerator has been installed in the door opening device to open the door by pushing in the direction of opening when you want to open the door.

Korean Laid-Open Patent Publication No. 2006-40436 discloses a refrigerator having a door opening device. This refrigerator is a double door type refrigerator having storage compartments mutually partitioned on both sides, and having a left door and a right door for opening and closing of each storage compartment. The door opening device of the refrigerator includes a drive motor for forward rotation and reverse rotation, and a main cam rotated by the drive motor. In addition, a first sub cam operated by the main cam and opening the left door, and a second sub cam operated by the main cam and opening the right door are also provided.

The door opening device opens the left door by operating the first sub cam by forward rotation of the main cam clockwise by the rotation operation of the drive motor. The main cam rotates counterclockwise by the reverse rotation operation of the drive motor to operate the second sub cam to open the right door.

However, such a door opening device has a step of operating the main cam by rotating the drive motor clockwise forward and by rotating it counterclockwise after opening the door to return the main cam to its initial position. The drive motor had to run twice to open the door. In other words, the driving motor had to rotate forward and then reverse. Therefore, the door opening device has a frequent operation of the drive motor, the life of the drive motor and the relay for controlling it could be shortened.

If the other door is opened after the other door is opened, the driving motor rotates in the first direction to open the one door, then rotates in the second direction opposite to return to the original position. Further rotating in the second direction to open the other door, and rotating in the first direction to return to its original position. Therefore, in this case, the driving frequency of the driving motor is frequent and there is a problem that the opening of the door is delayed.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a door opening device that can extend the life of the drive motor and related parts by reducing the number of operation of the drive motor for opening the door It is to provide a refrigerator and a control method thereof.

Another object of the present invention is to provide a control method of a refrigerator capable of determining whether the door opening device is broken and preventing malfunction of the driving motor due to a chattering phenomenon of the driving motor driving unit.

In order to achieve the above object, the present invention is a refrigerator having first and second doors to open and close the first and second storage compartments partitioned inside the main body, respectively, the door for opening the first and second doors A switch unit for inputting an open signal, an actuating member for selectively opening the two doors by rotation, a plurality of protrusions for contacting the actuating member to rotate the actuating member, and a plurality of spacing parts spaced apart from the actuating member; A door opening device including a rotary cam in which the protrusion and the spaced part are alternately disposed in a rotational direction, a driving motor for rotating the rotary cam in a forward direction and a reverse direction, and a restoring device for repositioning the operating member after opening of any one of the two doors. And when the door open signal is input to the switch unit, control the operation of the door open device according to the input door open signal. It is characterized in that the refrigerator comprises a control unit.

In addition, the controller recognizes only the door open signal inputted first when both door open signals of the two doors are input, and rotates the driving motor in a first direction to open the door corresponding to the recognized door open signal. It features.

The controller may not recognize all of the door open signals when the door open signals of the two doors are simultaneously input.

The controller may recognize only the door open signal for any one door set in advance when the door open signals of the two doors are simultaneously input.

The control unit may not recognize the door open signal when the door open signal is input while the driving motor is rotated.

The apparatus may further include a door open sensor unit configured to detect an open state of the door, and the controller may not recognize the door open signal when the door open sensor unit detects that the door corresponding to the input door open signal is open. It is characterized by not.

In addition, the operating member is located in any one of the plurality of spaced apart portion of the rotary cam in the initial state in which the door contact signal is not recognized when the rotation is rotated, the rotation of the rotary cam to control the operation of the drive motor The apparatus further includes a position sensing device for sensing a position, wherein the control unit determines a rotation position of the rotating cam detected by the position sensing device when any one door opening signal is recognized, followed by a spaced part in which the operating member is currently located. The drive motor is rotated in the first direction so that the rotary cam rotates until one stroke located at the spaced part disposed therein is completed.

In addition, the position sensing device includes a magnet provided at the front end of each of the projections, and a sensing sensor provided on the outside of the rotary cam to detect the magnet, the control unit is a projection that the sensor is disposed next to the current position If it is detected that it is determined that the first stroke is completed.

The display apparatus may further include a display unit for displaying a failure of the door opening device. The control unit may determine that the door opening device is in a failure state if the protrusion disposed next to the current position is not detected within the first set time. And controlling the display unit.

In addition, when the door open signal is recognized, the control unit first rotates the drive motor in the first direction for a second predetermined time before detecting the rotation position of the rotating cam.

The controller may be configured to rotate the drive motor in a first direction without detecting a rotation position of the rotary cam for a third set time when the separation unit is detected during the rotation of the drive motor.

In addition, when power is applied to the refrigerator, the control unit is characterized in that to rotate the drive motor in any one direction until the projection is disposed next to the current position to detect the initial failure.

The control unit may control the display unit to determine that the door opening device is in a failure state if the protrusion disposed next to the current position is not detected within the first set time during the initial failure diagnosis. .

In addition, the control unit is characterized in that the initial rotation of the drive motor for a second set time before detecting the rotational position of the rotary cam when the initial failure diagnosis.

In addition, the present invention is a control method of a refrigerator having first and second doors that open and close first and second storage compartments, which are divided into a main body, respectively, wherein the operating member selectively opens the two doors by rotation. A rotation cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation parts spaced apart from the operation member, wherein the rotation cam is alternately disposed in the rotation direction, and the rotation cam is rotated in a forward direction and a reverse direction. A door opening device including a driving motor for rotating and a restoring device for repositioning the operation member after the opening of any one of the two doors, and is input when a door opening signal for opening the first and second doors is input. The control method of the refrigerator for controlling the operation of the door opening device according to the door opening signal.

In addition, when both door open signals of the two doors are input, the input sequence is determined to recognize only the first door open signal input, and the driving motor in a first direction for opening the door corresponding to the recognized door open signal. It characterized in that to rotate.

In addition, when the door open signals of the two doors are input simultaneously, the door open signals may not be recognized at all, or the door open signal for any one door may be recognized.

In addition, when the door open signal is input while the driving motor is rotated, the input door open signal is not recognized.

In addition, when the door corresponding to the input door open signal is detected whether the door is open, the input door open signal is not recognized.

In addition, when the door open signal is recognized, the rotational position of the rotating cam is sensed so that the part in contact with the protrusion during rotation is located at any one of the plurality of spaced apart portions of the rotary cam in the initial state in which the door open signal is not recognized. The driving motor is rotated in the first direction so that the rotary cam rotates until one stroke is completed.

In addition, it is characterized in that it is determined that the first stroke is completed when detecting the protrusion disposed next to the current position by the sensing sensor provided on the outside of the rotary cam to detect the magnets provided at the front end of each of the protrusions.

In addition, if the protrusion disposed next to the current position is not detected within the first predetermined time, it is characterized in that the door opening device is determined to display a failure.

In addition, when the door open signal is recognized, the driving motor is first rotated in the first direction for a second predetermined time before detecting the rotation position of the rotating cam.

In addition, when the separation unit is detected during the rotation of the drive motor is characterized in that for rotating the drive motor in the first direction without detecting the rotation position of the rotary cam for a third set time.

In addition, when the power is applied to the refrigerator, characterized in that it further comprises the step of performing the initial failure diagnosis while rotating the drive motor in any one direction until the projection disposed next to the current position is detected.

In addition, if the protrusion disposed next to the current position is not detected within the first set time in the initial failure diagnosis step, it is determined that the door opening device is a failure and is displayed.

In addition, in the initial failure diagnosis step, the drive motor is first rotated for a second predetermined time before detecting the rotation position of the rotary cam.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 illustrates a refrigerator to which a door opening device is applied according to an embodiment of the present invention. The refrigerator includes a main body 10 in which a first storage compartment (not shown) and a second storage compartment (not shown) are mutually partitioned. The first door 11 and the second door 12 are installed on both sides of the main body 10 to open and close the first storage chamber and the second storage chamber. In such a refrigerator, a first storage compartment generally constitutes a freezing compartment, and a second storage compartment constitutes a refrigerating compartment. The first door 11 and the second door 12 are rotatably coupled to the main body 10 by the upper and lower hinge devices 13. In addition, handles 14 and 15 are provided on the front surfaces of the doors 11 and 12.

The door opening device 20 is installed above the main body 10. The door opening device 20 opens the doors 11 and 12 by pushing the upper portions of the first door 11 and the second door 12 to the front so that the user can easily open the door.

2 to 6 are views showing the door opening device 20 according to the present embodiment, and Fig. 7 is a block diagram showing the operation control of the door opening device 20.

As shown in FIGS. 2 and 3, the door opening device 20 is configured to open the two doors 11 and 12 and the operation member 30 to selectively open the two doors 11 and 12 by rotation. The rotary cam 40 for rotating the operation member 30, the drive motor 50 for rotating the rotary cam 40 in the forward and reverse directions is provided. It also includes a cam cover 52 for receiving the rotary cam 40, and an upper cover 21 for covering the upper portion.

The rotary cam 40 includes three protrusions 41 for rotating the operating member 30 in contact with the operating member 30 and three spaced portions 42 spaced apart from the operating member 30. . Each protrusion 41 and each spacer 42 are alternately arranged in the rotational direction, and the protrusions 41 are arranged at intervals of 120 degrees. Each protrusion 41 is made of a curved surface in the form of a mountain, each spacing portion 42 is made of a curved surface of the bone shape.

In the present embodiment, the case in which the protrusions 41 and the spacers 42 are provided by three is described as an example, but the number of the protrusions 41 and the spacers 42 may be adjusted as necessary within the range of performing the same function. Of course, it can be applied differently.

The cam cover 52 accommodating the rotary cam 40 is fixed to the upper surface of the refrigerator body 10 by fastening the fixing screw 53, and the driving motor 50 is fixed to the upper surface of the cam cover 52. The shaft 51 of the driving motor 50 passes through the cam cover 52 and extends into the cam cover 52 to be coupled to the rotary cam 40. Therefore, the rotary cam 40 rotates inside the cam cover 52 when the driving motor 50 operates.

The operating member 30 is rotatably coupled to the upper surface of the main body 10 in front of the rotary cam 40. As shown in FIG. 2, a support shaft 23 is provided on the upper surface of the main body 10 for such coupling. The support shaft 23 is coupled to the fastening screw 24 for preventing the separation of the operating member 30 after the operation member 30 is coupled.

As shown in FIG. 3, the operation member 30 includes a first extension 31 extending from the rotation center toward the rotation cam 40 and a second extension extending from the rotation center toward the inner surface of the first door 11. A part 32 and a third extension part 33 extending from the center of rotation toward the inner surface of the second door 12 are provided. The actuating member 30 is of the "Y" shape. The first extension portion 31 of the operating member 30 is such that its end is in contact with the protrusion 41 of the rotary cam 40 but spaced apart from the spaced portion 42 of the rotary cam 40. The operating member 30 has a distance L1 from the end of the first extension part 31 to the center of rotation than the distance L2 from the ends of the second and third extension parts 32, 33 to the center of rotation. long. The principle of the lever is applied, as shown in Figures 4 and 6, even if the rotary cam 40 rotates the first extension portion 31 of the operation member 30 with a small force, the second or third extension The parts 32 and 33 pressurize the inner surface of the first or second doors 11 and 12 with a large force so that the first and second doors 11 and 12 can be easily opened.

Rollers 34 are installed at ends of the first to third extension parts 31, 32, 33 of the operation member 30, respectively. This prevents friction between the first extension part 31 and the rotary cam 40 when the door opening device 20 operates, and the second and third extension parts 32 and 33 and the first and second doors. This is to prevent the friction between (11, 12). In addition, a return spring 25 for returning the operation member 30 to the initial position is provided in the first extension portion 31 of the operation member 30.

The return spring 25 has one end connected to the first extension part 31 and the other end connected to the upper surface of the refrigerator body 10 to impart an elastic restoring force to the first extension part 31. Although the coil type return spring 25 is illustrated as a device for restoring the operating member 30 in the drawing, the restoring device may be made of an elastic member such as a torsion spring, a spiral spring, and rubber.

In this way, since the elasticity of the return spring 25 acts on the operation member 30, it is restored to the initial state as shown in FIG. In the initial state, the end of the first extension part 31 is positioned at the separation part 42 of the rotary cam 40, and the driving motor 50 is the separation part 42 and the first extension part of the rotary cam 40. The operation stops when the position of (31) coincides.

To this end, the door opening device 20 is provided with a position detection device 110 for detecting the rotational position of the rotary cam 40 to control the operation of the drive motor (50). The position detecting device 110 is fixed to the magnets 43 provided at the tip of each protrusion 41 of the rotary cam 40 and the cam cover 52 outside the rotary cam 40 so as to detect the magnet 43. And a position sensor 44.

The position detecting sensor 44 is composed of a normal reed switch. In the present embodiment, the position detecting sensor 44 is in an on state when the position detecting sensor 44 faces the magnet of the protrusion 41. If it is in a state facing the spacer 42 is described as being off, but may be configured to the contrary.

The position detecting device 110 is not limited thereto, and an optical sensor for detecting the position of the protrusion 41 or a limit switch for detecting the position through contact with the protrusion may be provided.

1 and 2, the upper cover 21 covers the upper portion of the operating member 30 and the drive motor 50 in a spaced apart state, the body 10 by fastening a plurality of fixing screws 22. ) It is fixed on the upper surface.

In addition, the door opening device 20 has switch portions 16 and 17 provided on the handles 14 and 15 of the first and second doors 11 and 12 so as to control the operation of the driving motor 50. It includes. The switch unit 16 or 17 may be a detection sensor that detects when the user grabs the handles 14 and 15 or a power switch that directly opens or closes the power applied to the driving motor 50.

Next, the operation of the door opening device 20 will be described.

As shown in FIG. 3, the driving motor 50 does not operate unless the handles 14 and 15 are grasped while the first door 11 and the second door 12 are closed. Therefore, the initial state is maintained. That is, the first extension part 31 of the operation member 30 is located at the center of the separation part 42 of the rotary cam 40.

As shown in FIG. 4, when the user grabs or pulls the handle 14 of the first door 11 to open the first door 11, the driving unit 50 is operated while the switch unit 16 is operated. It works. At this time, since the rotary cam 40 rotates clockwise by the operation of the driving motor 50, the protrusion 41 pushes the first extension part 31 of the operating member 30. Rotate in the direction. Therefore, the second extension part 32 pushes the inner surface of the first door 11 so that the first door 11 is easily opened. As shown in FIG. 6, when the rotation cam 40 rotates 120 degrees in the clockwise direction, when the position sensor 44 detects the magnet 43 provided in the protrusion 41, the driving motor 50 operates. Stops. In this state, the rotary cam 40 is rotated 120 degrees, which is the same as the initial state. On the other hand, the operation lever 30 is restored to its original state by the elasticity of the return spring 25 at the moment when the pressure of the first extension portion 31 by the protrusion 41 of the rotary cam 40 is released. Thus, the door opening device 20 of the present invention can perform the opening of the door only by the operation in which the driving motor 50 rotates a predetermined section in one direction, and minimizes the number of times the operation of the driving motor 50 because the initial state again. can do. Therefore, it is possible to extend the life of the drive motor 50 and related parts.

As shown in FIG. 6, when the user grabs or pulls the handle 15 of the second door 12 to open the second door 12, the driving motor 50 is operated while the switch unit 17 is operated. It works in the reverse direction. At this time, the rotary cam 40 is rotated counterclockwise by the operation of the drive motor 50, the protrusion 41 pushes the first extension 31 of the operating member 30, the operating member 30 is Rotate clockwise. Therefore, in this case, the third extension part 33 pushes the inner surface of the second door 12 to open the second door 12. After opening of the second door 12, the rotary cam 40 stops by rotating 120 degrees, and the operation lever 30 is also restored to the initial state by the elasticity of the return spring 25. As described above, the present invention may minimize the operation of the driving motor 50 because the driving motor 50 is sufficient to operate once in either direction when the doors 11 and 12 are opened.

Even when the first door 11 and the second door 12 are continuously opened, both the doors 11 and 12 are rotated only by the driving motor 50 rotating clockwise and then counterclockwise again. Can open Therefore, as compared with the conventional case, not only can the operation frequency of the driving motor 50 be significantly reduced, but as a result, the opening of the two doors 11 and 12 can be performed quickly.

Looking at the configuration for controlling the operation of the above-described door opening device 20, when the door opening signal is input through the switch unit 16, 17 as shown in the block diagram of FIG. By using the information transmitted from the 110 and the timer 140, a signal for controlling the operation of the driving motor 50 is transmitted to the motor driver 150 according to a program stored in advance in the memory 130.

In addition, the control unit 100 may operate the driving motor 50 when a door opening signal is input using information received from the door opening sensor unit 120 that detects whether the two doors 11 and 12 are open. Determine whether or not.

On the other hand, the controller 100 determines whether the door opening device 20 is broken during the initial operation of the door opening device 20 or the power is input, and displays a control signal to the display unit 160 to display the case when the door is broken. To pass.

8 is a flowchart illustrating an initial failure diagnosis method of the door opening device 20 according to an embodiment of the present invention.

When power is applied to the refrigerator (S200), the controller 100 transmits a signal for forward rotation of the driving motor 50 clockwise to the motor driver 150 for the first predetermined time. It will be described later (S210).

When the step S210 is completed, the control unit 100 operates the timer 140 while maintaining the rotation of the driving motor 50 (S220), and whether the rotation time T of the driving motor 50 has passed the second predetermined time. It is determined whether or not (S230).

If the rotation time (T) of the drive motor 50 does not pass the second set time in step S230 determines whether or not the position detection sensor 44 composed of the above-described reed switch is in the off state, Returning to step S230 and if the off state maintains the forward rotation of the drive motor (50) (S240, S250).

On the other hand, if the rotation time (T) of the drive motor 50 in the step S230 when the second set time elapses in the state that the off state of the position sensor 44 is not recognized, the control unit 100 is a door opening device A signal for indicating that 20 is a fault is transmitted to the display unit 160 and the control ends (S300).

When the step S250 is completed, the control unit 100 operates the timer 140 (S260), and determines whether the rotation time T of the driving motor 50 has passed the third set time (S270).

If the rotation time T of the driving motor 50 has not passed the third set time in step S270, it is determined whether the position detecting sensor 44 is in an on state and returns to step S270 if it is not in an on state. If it is determined that the door opening device 20 is normal, the operation of the driving motor 50 is stopped (S280 and S290).

On the other hand, if the rotation time (T) of the drive motor 50 in the step S270 when the third set time elapses without the on state of the position sensor 44 is recognized, the control unit 100 performs step S300 do.

At this time, the second set time and the third set time is a value which is experimentally obtained and stored in advance in the memory 130, and when the door opening device 20 is normal, the position detecting sensor 44 is in an off state or an off state. It is preferable to set the maximum time required to turn on from the state.

In the present embodiment, when the position sensor (lead switch) 44 is turned on after the doors 11 and 12 are opened, the driving motor 50 is stopped. In this case, the driving motor 50 stops due to inertial force. In spite of this, there is a case where the motor rotates to some extent in the rotational direction and stops in the off state.

Therefore, when the stop position of the drive motor 50 is in the reverse rotation direction before applying the power of the refrigerator in step S200, when the initial failure diagnosis is performed in the forward rotation direction as in the present embodiment, it is recognized as being in the off state momentarily. Because there is a problem that can not perform a reliability diagnosis is guaranteed in this embodiment by performing the step S210 to eliminate the effect of the inertial force and then diagnose the failure.

At this time, the first set time is a value which is experimentally obtained and stored in advance in the memory 130, and is a rotation time for considering the stop position of the driving motor 50 generated when the door opening device 20 is normal.

On the other hand, in the present embodiment has been described a case in which the initial failure diagnosis by the forward rotation of the drive motor 50 as an example may be rotated in any one of the forward rotation or reverse rotation.

9 is a flow chart showing a control method of the door opening device 20 according to an embodiment of the present invention.

When the door open signal is input through the switch unit 16 or 17 (S410), the control unit 100 determines whether the input door open signal is a door open signal for any one of the two doors 11 and 12. (S420).

If the door open signal for any one of the two doors 11 and 12 in step S420, the control unit 100 determines whether the driving motor 50 is in a stopped state (S450), and if the determination result of step S450 stops It is determined whether the door corresponding to the door open signal is in a closed state, and if the state is closed, the driving motor 50 is rotated in the direction in which the door is opened for the first set time (S460 and S470).

In this case, whether the door is closed or not is determined by the information transmitted from the door open sensor unit 120, and the first set time is the same as in the initial failure diagnosis method, and thus redundant description is omitted.

On the other hand, when the door open signal for all the two doors (11, 12) is input in step S420, the control unit 100 determines whether the two signals are sequentially input (S430), if the input is sequentially input first Only the door opening signal is recognized and returned to step S450, and the other door opening signal is not received (S440).

If two door open signals are input at the same time in step S430, the control unit 100 does not accept both signals. However, in this case, as another embodiment, it is also possible to recognize the door open signal for any one of the doors basically set in the memory 130. In this case, returning to step S450 is the same.

In addition, when the determination result of step S450 is not the stop state, the controller 100 determines that the door opening device 20 is being driven and does not accept the currently input door opening signal.

In addition, if the corresponding door is in the open state as a result of the determination in step S460, the controller 100 determines that it is an unnecessary input signal and does not accept the currently input door opening signal.

On the other hand, when the step S470 is completed, the control unit 100 operates the timer 140 while maintaining the rotation of the driving motor 50 (S480), and the rotation time T of the driving motor 50 is the second set time. It is determined whether it has passed (S490).

If the rotation time T of the driving motor 50 has not passed the second set time in step S490, it is determined whether the position detecting sensor 44 configured by the above-described reed switch is in an off state. Otherwise, if it is returned to the step S490 and the off state, the rotation of the driving motor 50 is maintained regardless of whether the position detection sensor 44 is turned on or off for the third set time (S500 and S510).

At this time, the reason for maintaining the rotation of the drive motor 50 for a third set time is to prevent the malfunction of the drive motor 50 due to the chattering phenomenon of the motor drive unit 150.

Chattering refers to a phenomenon in which an electrical contact is abnormally turned on or off for a very short time due to mechanical vibration. In this embodiment, the position sensor 44 is instantaneously turned off in a chattering phenomenon. When it is in the on state, even though the rotation of the driving motor 50 for actually opening the door does not occur, the controller 100 prevents the rotation because the driving motor 50 is determined to open the door. In order to perform the step S510.

On the other hand, if the rotation time (T) of the drive motor 50 is not recognized the off state of the position sensor 44 in step S490 when the second predetermined time elapses, the control unit 100 is a door opening device ( A signal for indicating that 20 is a fault is transmitted to the display unit 160 and the control ends (S560).

When the step S510 is completed, the control unit 100 operates the timer 140 (S520), and determines whether the rotation time T of the driving motor 50 has passed the fourth set time (S530).

If the rotation time T of the driving motor 50 has not passed the fourth set time in step S530, it is determined whether the position detecting sensor 44 is in an on state. In this state, it is determined that the corresponding door is opened and the operation of the driving motor 50 is stopped (S540, S550).

On the other hand, if the rotation time (T) of the drive motor 50 in the step S530 has passed the fourth set time without the on state of the position sensor 44 is recognized, the control unit 100 performs step S560 do.

At this time, the second set time and the fourth set time are values that are experimentally obtained and stored in advance in the memory 130, and when the door opening device 20 is normal, the position detecting sensor 44 is in an off state or an off state. It is preferable to set the maximum time required to turn on from the state.

As described in detail above, the door opening device of the refrigerator according to the present invention can perform the opening of the door only by the operation of the drive motor rotates a predetermined section in one direction, and the drive motor does not operate in the reverse direction after opening the door. Even when the first door and the second door are opened continuously, both doors can be opened only by the forward and reverse rotation of the drive motor, so the operation control of the drive motor is minimized and the life of the drive motor and related parts are minimized. There is an effect that can be extended.

In addition, the refrigerator and the control method according to the present invention detects the position of the rotary cam during the initial power input or during operation to determine whether the door opening device is broken, and operates for a predetermined time at the initial detection of the position of the rotary cam. By forcibly rotating the motor, it is possible to prevent the drive motor from malfunctioning due to a chattering phenomenon of the motor driving part.

Claims (27)

In the refrigerator having first and second doors to open and close the first and second storage compartments partitioned inside the main body, respectively, A switch unit for inputting a door open signal for opening the first and second doors, an operating member for selectively opening the two doors by rotation, a plurality of protrusions for rotating the operating member in contact with the operating member, and the A rotation cam having a plurality of separation parts spaced apart from the operation member and the projection and the separation part alternately arranged in a rotation direction, a drive motor for rotating the rotation cam in a forward direction and a reverse direction, and the operation member after opening of any one of the two doors. Door opening device including a restoring device to the original position; And And a controller configured to control an operation of the door opening device according to the input door opening signal when the door opening signal is input to the switch unit. The method of claim 1, The control unit recognizes only the door open signal inputted first when both door open signals are input, and rotates the driving motor in a first direction to open the door corresponding to the recognized door open signal. The method of claim 2, The control unit does not recognize all the door open signal when the door open signal of both doors are input at the same time. The method of claim 2, The control unit recognizes only the door open signal for any one door in advance when the door open signal of the two doors are input at the same time. The method of claim 4, wherein The control unit does not recognize the door open signal when the door open signal is input during the rotation of the drive motor. The method of claim 5, Further comprising a door opening sensor unit for detecting the open state of the door, The control unit does not recognize the door open signal when the door open sensor detects that the door corresponding to the input door open signal is open. The method of claim 6, The actuating member is located at any one of the plurality of spaced apart portions of the rotating cam in the initial state in which the part contacting the protrusion during rotation is not recognized the door opening signal, Further comprising a position detecting device for detecting the rotation position of the rotary cam to control the operation of the drive motor, The control unit determines the rotational position of the rotating cam detected by the position sensing device when any one door opening signal is recognized, and completes one stroke in which the operating member is located in the separation unit disposed after the separation unit in which the operation member is currently located. Refrigerator for rotating the drive motor in the first direction so that the rotary cam is rotated until it is. The method of claim 7, wherein The position detecting device includes a magnet provided at the tip of each of the protrusions, and a sensing sensor provided on the outside of the rotary cam to detect the magnet, The control unit determines that the first stroke is completed when the detection sensor detects a protrusion disposed next to the current position. The method of claim 8, Further comprising a display unit for indicating a failure of the door opening device, And the control unit controls the display unit to determine that the door opening device is out of order and display the failure if the protrusion disposed next to the current position is not detected within the first preset time. 10. The method of claim 9, The control unit, when the door open signal is recognized, the refrigerator to first rotate the drive motor in the first direction for a second predetermined time before detecting the rotation position of the rotary cam. The method of claim 10, The control unit is a refrigerator for rotating the drive motor in the first direction without detecting the rotation position of the rotary cam for a third set time when the separation unit is detected during the rotation of the drive motor. The method of claim 11, When power is supplied to the refrigerator, the controller rotates the driving motor in any one direction until a protrusion disposed next to the current position is detected for initial failure diagnosis. The method of claim 12, And the control unit controls the display unit to determine that the door opening device is in a failure state if the protrusion disposed next to the current position is not detected within the first set time during the initial failure diagnosis. The method of claim 13, The control unit is a refrigerator for first rotating the drive motor for a second predetermined time before detecting the rotational position of the rotary cam when the initial failure diagnosis. In the control method of the refrigerator having first and second doors to open and close the first and second storage compartments partitioned inside the main body, respectively, An operating member for selectively opening the two doors by rotation, a plurality of protrusions for contacting the operating member to rotate the operating member, and a plurality of spacers spaced apart from the operating member, wherein the protrusions and the spacer are alternately rotated in a rotational direction. A door opening device including a rotation cam disposed, a drive motor for rotating the rotation cam in a forward direction and a reverse direction, and a restoring device for returning the operation member after opening of any one of the two doors; And a door opening signal for opening the first and second doors to control the operation of the door opening device according to the input door opening signal. The method of claim 15, When the door open signals of both doors are input, the input sequence is determined to recognize only the input door open signal first, and the driving motor is rotated in the first direction to open the door corresponding to the recognized door open signal. How to control the refrigerator. The method of claim 16, When the door open signals of the two doors are input simultaneously, the control method of the refrigerator not recognizing all the door open signals or recognizing only the door open signal for any one door. The method of claim 17, The control method of the refrigerator that does not recognize the input door open signal when the door open signal is input during the rotation of the drive motor. The method of claim 18, The control method of the refrigerator that detects whether the door corresponding to the input door open signal is open and does not recognize the input door open signal in the open state. The method of claim 19, When the door opening signal is recognized, the rotational position of the rotating cam is sensed, and the operating member is positioned at any one of a plurality of spaced parts of the rotating cam in an initial state in which a part contacting the protrusion during rotation is not recognized. The control method of the refrigerator for rotating the drive motor in the first direction so that the rotary cam is rotated until one stroke that is located in the spaced portion disposed next to the spaced portion is currently located. 21. The method of claim 20, The control method of the refrigerator to determine that the first stroke is completed when the sensing sensor disposed on the outside of the rotary cam to detect the magnets provided at the front end of each of the protrusions to detect the protrusions disposed next to the current position. The method of claim 21, And determining that the door opening device is broken when the protrusion disposed next to the current position is not detected within the first preset time. The method of claim 22, And controlling the refrigerator to first rotate the driving motor in the first direction for a second predetermined time before detecting the rotation position of the rotating cam when the door opening signal is recognized. 24. The method of claim 23, When the separation unit is detected during the rotation of the drive motor control method of the refrigerator for rotating the drive motor in the first direction without detecting the rotation position of the rotary cam for a third set time. The method of claim 24, When the power is applied to the refrigerator, the control method of the refrigerator further comprising the step of performing the initial failure diagnosis by rotating the drive motor in any one direction until the projection disposed next to the current position is detected. The method of claim 25, The control method of the refrigerator for determining that the door opening device is a failure if the protrusion disposed next to the current position within the first set time in the initial failure diagnosis step is not detected. The method of claim 26, The control method of the refrigerator to rotate the drive motor first for a second predetermined time before detecting the rotation position of the rotary cam in the initial failure diagnosis step.

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