KR101929483B1 - Refrigerator and method for the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator and a control method thereof, and more particularly to a refrigerator and a control method thereof for detecting a degree of odor generated from a food in storing food and preventing unpleasant odors from being left in the refrigerator. By detecting the intensity and controlling the deodorizing function according to the intensity, it is possible to quickly deodorize even when a food is newly added and smell is generated, thereby reducing the uncomfortable feeling of the user and preventing the smell from affecting other foods. It is effective.

Description

Refrigerator and method of controlling same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator and a control method thereof, and more particularly, to a refrigerator for taking in odors due to food put into a refrigerator and a control method thereof.

The refrigerator is provided with a refrigerant circulation system as means for supplying cold air to the inside of the refrigerator.

Generally, a refrigerant circulation system includes a compressor for compressing refrigerant, a condenser for flowing high-temperature and high-pressure refrigerant discharged from the compressor, an expansion valve for expanding the refrigerant passing through the condenser to a low temperature and a low pressure, And an evaporator that exchanges heat with air.

The air cooled by heat exchange with the evaporator flows into the cooler. And the compressor and the condenser are mounted in a machine room provided behind the refrigerator. In the case of a cooling device, a fan is mounted on one side of the condenser to allow heat exchange between the condenser and the room air. Therefore, the room air forced to flow by the blowing fan makes contact with the condenser and performs heat exchange.

Such a refrigerator supplies different cold air to a space inside a refrigerator provided with a plurality of chambers, so that foods having different storage conditions can be stored in the respective chambers.

As the refrigerator stores food, there is a problem that the odor may be generated from the food when the food is put in, and affect the other stored food.

Accordingly, the refrigerator has a deodorizing function, so that the odor of the food in the refrigerator is removed.

However, there is a problem that the odor of the food is constantly generated, and a new odor is generated according to each new food, so that it is not easy to remove the odor in the refrigerator.

Therefore, the user may use an auxiliary agent for deodorization but there is a problem that the lifetime thereof is limited and it is periodically replaced.

Therefore, it is necessary to find a way to more effectively remove the food odor in the refrigerator.

The present invention relates to a refrigerator and a control method thereof, and in particular, it is an object of the present invention to provide a refrigerator and a control method thereof for controlling odors to be deodorized by detecting odors generated from foods in storing foods.

A refrigerator according to the present invention comprises a case partitioned by a refrigerating chamber and a freezing chamber to form an internal space, a door for opening and closing the refrigerating chamber, a panel mounted on an inner wall of the refrigerating chamber, An odor sensor mounted on the panel at a position spaced apart from the deodorizer case, and an odor sensor attached to the panel, the deodorant case comprising a deodorizing fan and a filter, And a control unit for controlling the operation of the deodorant fan according to the change of the average value by comparing the first average value for the first set time and the second average value for the second set time after the first set time, .

The control unit controls the deodorizing pan by using the first average value as a reference value and the second average value as a current value and determining the concentration of the odor according to the ratio of the first average value and the second average value. The control unit re-calculates the first average value and the second average value by a predetermined time unit, and determines a change in relative odor through the continuously changed reference value and the current value. The control unit calculates the sensed value of the odor sensor in a first time unit and re-calculates the first average value and the second average value in units of a second time larger than the first time to determine the concentration of the odor .

Wherein the odor sensor is a semiconductor type gas sensor. In addition, the odor sensor includes any one of In2O2 and SnO2 which reacts with H2S, TMA, and MM, which are food odors, as a sensing material.

Wherein the odor sensor includes an element heater including a heater element having a heat generation temperature of 325 degrees or less below a temperature of the ignition point of the refrigerant gas in the refrigerator.

A method of controlling a refrigerator according to the present invention is a refrigerator in which an inner space is divided into a refrigerating chamber and a freezing chamber by a case and an odor sensor provided on a panel mounted on an inner wall surface of the refrigerating chamber is disposed in a chamber A first average value during a first set time of the sensed value sensed by the odor sensor and a second average value during a second set time after the first preset time are compared to determine a change in odor The deodorant pan connected to the panel is operated according to the change of the temperature and the odor of the deodorizing pan, and the air inside the refrigerating chamber is passed through the filter accommodated in the deodorizing case formed with the space in which the air can flow in and out by the deodorizing fan And discharging it.

The refrigerator and its control method of the present invention can effectively use the filter by detecting the odor and controlling the deodorizing function so that no unpleasant odor remains in the refrigerator due to the odor generated from the food, It is possible to rapidly deodorize even if it occurs, thereby reducing the user's discomfort and preventing the odor from affecting other foods.

1 is a view illustrating a refrigerator according to an embodiment of the present invention.
2 is a block diagram briefly illustrating a main configuration of a refrigerator according to an embodiment of the present invention.
3 is an exploded perspective view illustrating a configuration of a refrigerator deodorizer according to an embodiment of the present invention.
FIG. 4 is an exemplary diagram for explaining a position of a sensor for detecting odors of a refrigerator according to an embodiment of the present invention. Referring to FIG.
5 is a view showing a configuration of an odor sensor according to an embodiment of the present invention.
FIG. 6 is a graph showing sensor characteristics according to the type of waterproof material of the odor sensor according to an embodiment of the present invention.
7 is a graph illustrating sensed signals according to the type of the odor sensor according to an embodiment of the present invention.
FIG. 8 is a graph showing a change in odor sensed according to the type of food put into the refrigerator of the present invention.
FIG. 9 is a graph showing the change of odor according to the deodorization mode setting of the refrigerator of the present invention.
10 is a diagram for explaining a method of detecting odor and deodorizing in a refrigerator of the present invention.
11 is a flowchart illustrating a control method for deodorization of a refrigerator according to an embodiment of the present invention.
12 is a diagram illustrating an example of a display unit in which a deodorization mode of a refrigerator according to an embodiment of the present invention is displayed.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

1 is a view illustrating a refrigerator according to an embodiment of the present invention.

1, a refrigerator 1 according to the present invention includes a case 11 forming an internal space defined by a refrigerating compartment 12 and a freezing compartment 13, a refrigerating compartment door 14 for opening and closing a refrigerating compartment 15), a rough outer appearance is formed by the freezing chamber door.

The refrigerating compartment 12 is opened and closed by the refrigerating compartment doors 14 and 15 provided on the right and left sides, respectively.

The refrigerator compartment doors 14 and 15 include a left refrigerator compartment door 14 rotatably connected to the left side of the case 11 and a right refrigerating compartment door 15 rotatably connected to the right side of the case 11.

At this time, the refrigerating compartment 12 is opened by the left door and the right door to constitute one room, but a left and right private room may be provided in some cases. The door of the refrigerating chamber 12 is rotatably connected to the case.

The hinge portions 112 and 113 allow the refrigerator compartment doors 14 and 15 to be rotatably connected to the case 11. A hinge portion 113 for connecting the left fridge chamber door 14 to the case 11 and a hinge portion 112 for connecting the right fridge chamber door 15 to the case 11. The hinge portion 113 to which the left refrigerating chamber door 14 is connected may have the same structure as the hinge portion 112 to which the right refrigerating chamber door 15 is connected.

A door switch (not shown) is provided on the hinge portion 112 to turn on / off the illuminating lamp (not shown) illuminating the refrigerating compartment 12 by contacting the door switch when the right fridge door 15 is closed . The door switch blinks the illumination lamp when the right refrigerator compartment door 15 is closed and lights up the right refrigerator compartment door 15 when the door is opened.

Further, the door switch further includes a door switch connector (not shown), and it is possible to detect whether the door of the refrigerator compartment door is opened or closed as the door switch connector is drawn inward.

The freezing chamber 13 is also provided with a door that is opened and closed in the left and right direction.

In some cases, the freezer compartment 13 is coupled to slide along the case 11 and can be configured to receive food. In this case, the freezing chamber door slides toward the inside of the case 11, and when it is stored, the freezing chamber 13 is closed and pulled out from the case 11, and when it is drawn out, the freezing chamber 13 is opened. The refrigerator may further include a separate storage room slidable in this manner.

The door of the refrigerating chamber 12 is provided with a control panel (not shown). The control panel is provided with an input unit (not shown) including at least one button for setting the operation of the refrigerator 1 and a display unit (not shown) for displaying the current operation mode and operation state of the refrigerator.

A deodorizing section (16) is provided inside the refrigerating chamber (12). An odor sensor (not shown) is provided inside the panel 17 to measure the intensity of the odor in the refrigerating compartment 12. At this time, the panel 17 may be provided with illumination.

The deodorizing unit 16 operates in accordance with the set deodorizing mode to circulate the air inside the refrigerating chamber 12. [ At this time, the deodorizing unit 16 sucks the air inside the refrigerating chamber so as to pass through the filter, thereby allowing the filter to adsorb foreign matter, odorous substances, bacteria and the like. Accordingly, the deodorizing unit 16 sterilizes the air inside the refrigerator and removes the odor. The deodorizing unit 16 operates in accordance with the deodorizing mode set by changing the deodorizing mode in accordance with the intensity of the odor measured by the odor sensor.

The input unit may be implemented by a mechanical button or a touch button of an electrostatic / static pressure type so as to receive various operation commands from a user. At this time, the input unit is provided with a mode selection unit for setting the kimchi mode.

The display unit is a light emitting unit such as an LED, an LCD, or an organic EL, and displays status information or failure information of the refrigerator 1 in a visualized form. The control panel 18 may include a lamp (not shown) that lights up and blinks to indicate the state of the refrigerator 1 and may include an acoustic outputting means (not shown) for outputting sound such as a buzzer or a speaker, .

The refrigerator (1) has a circulation cycle in which the refrigerant circulates along the refrigerant pipe and compresses, expands, evaporates, and condenses. The refrigerator (1) performs refrigeration or freezing by performing heat exchange with ambient air by phase change of the refrigerant during the circulation cycle (Not shown) for compressing the refrigerant, an expansion valve (not shown) for expanding the refrigerant, a heat exchanger (not shown) serving as the evaporator for evaporating the refrigerant, and a condenser (Not shown) for flowing heat-exchanged air, and a freezer compartment fan, respectively. Further, the refrigerator 1 includes a plurality of sensors.

The refrigerator (1) controls the cooling system on the basis of the set operation mode and the measured temperature to form an environment for storing foodstuffs accommodated in the respective rooms.

2 is a block diagram briefly illustrating a main configuration of a refrigerator according to an embodiment of the present invention.

2, the refrigerator 1 includes an input unit 170, a display unit 180, a sensing unit 120, a data unit 190, a compressor 161, a freezer compartment fan 141, a refrigerating compartment fan 151 A refrigerator fan driving unit 150, a compressor driving unit 160, a deodorizing unit 130 and a refrigerator 1, and a control unit 110 for controlling overall operations of the refrigerator 1.

The sensing unit 120 includes a plurality of sensors to sense an operation state of the refrigerator 1 and input the sensed state to the controller 110. [ The sensing unit 120 includes a plurality of sensors such as a temperature sensor 121, a pressure sensor, an odor sensor 122, a fan motor sensor, and a defrost sensor, but a description thereof will be omitted below.

The temperature sensor 121 includes a refrigerating compartment temperature sensor for sensing the temperature of the refrigerating compartment 12, a freezing compartment temperature sensor for sensing the temperature of the freezing compartment 13, an outdoor temperature sensor for measuring the temperature of the indoor space, Sensor.

The odor sensor 122 senses the odor inside the refrigerating chamber 12. The odor sensor 122 may be included in the freezer as well as the freezer. At this time, the odor sensor 122 is a gas sensor and detects the odor generated from the food put into the refrigerating chamber.

The deodorizing units 130 and 16 include a deodorizing fan 131, a filter 132, and a sterilizing lamp 133. [

The deodorizing fan 131 circulates the air inside the refrigerator, in particular, to suck air in the refrigerator compartment, allowing the air to pass through the filter, and allowing the filtered air to circulate inside the refrigerator compartment again. At this time, the deodorizing fan 131 may cause the air inside the refrigerator to be discharged to the outside.

The odor sensor 122 detects the odor of the inside of the refrigerator and if the odor intensity is above a predetermined value, the odor sensor 122 operates according to a control command of the controller 110 to discharge the air inside the refrigerator to the outside Thereby reducing the odor.

The sterilizing lamp 133 lights up for a predetermined time to sterilize bacteria or bacteria. At this time, the sterilizing lamp 133 is composed of a visible light LED. The sterilizing lamp 133 irradiates the filter 132 with light to improve the sterilizing power of the filter.

The filter 132 is composed of a plurality of filters to adsorb, filter and remove floating matters, for example, fine particles or bacteria, in the refrigerating chamber 12. [ At this time, when the sterilizing lamp 133 is turned on, the filter 132 increases the sterilizing power by the light of the sterilizing lamp. Further, the filter 132 has a deodorizing effect of adsorbing odor particles to remove the odor.

The data unit 190 stores control data of the refrigerator for controlling the operation of the refrigerator 1, data on the inputted operation setting, reference data for determining whether the refrigerator is normally operated, and operation data measured or generated during the operation of the refrigerator .

The data unit 190 stores measurement data measured and input from the sensing unit 120. In particular, the data unit 190 accumulates and stores the measured odor data from the odor sensor 122 and stores data for determining the strength of the odor.

The input unit 170 is provided in the above-described control panel, and inputs data relating to the operation mode or the operation setting of the refrigerator 1. The input unit 170 may include at least one button or touch input means. For example, the input unit 170 is provided with a lock button for performing a key-lock function to restrict input by a user, a temperature setting button for setting a true temperature, and an operation mode button.

The display unit 180 is provided on the control panel, and displays the operation state and operation state of the refrigerator 1 by a combination of images, characters, special characters, and the like.

The display unit 180 displays temperature and operating conditions for each room, that is, the refrigerator compartment and the freezer compartment, and in particular, information on a deodorizing mode for removing the odor intensity or the smell to the refrigerator compartment or the freezer compartment.

In addition to the display unit 180, the refrigerator 1 may further include a speaker for outputting a warning sound or an effect sound according to the operation, a lamp for indicating whether the lamp is on, a lighting color, or a blinking control.

 The control unit 110 sets the operation of the refrigerator 1 corresponding to the data input from the input unit 170 and outputs the operation state through the display unit 180. [ The control unit 110 outputs the respective display states of the refrigerators to the display unit 180 and controls the respective rooms in accordance with the data input through the input unit 170. [ The control unit 110 analyzes and controls the operation state of the refrigerator 1 based on the information collected through various sensors provided in the sensing unit 120. [

The controller 110 determines the intensity of the odor corresponding to the odor data input from the odor sensor 122 and accumulates and stores the odor data in the data unit 190.

The controller 110 receives the odor data from the odor sensor 122 at predetermined time intervals, and determines the intensity of the odor at predetermined time intervals. The control unit 110 controls the deodorization unit 130 in accordance with the intensity of the odor to remove the food odor inside the refrigerator.

The control unit 110 calculates the average value of the odor based on the accumulated data in determining the intensity of the odor to determine the intensity of the odor. As described above, the refrigerator 1 is configured to supply the cold air according to the circulation of the refrigerant. Accordingly, even when the cold air is supplied according to the cooling / cooling cycle, the sensed value of the odor sensor changes The average value of the detected value of the smell is used.

 The control unit 110 resets the deodorizing mode by comparing the intensity of the odor before the change with the intensity of the odor at a point of time after a predetermined time has elapsed based on the point of time when the deodorization mode is changed in the setting of the deodorization mode.

The control unit 110 controls the deodorization unit 130 by setting the deodorization mode to the normal automatic mode or the power mode in accordance with the strength of the odor. At this time, the display unit 180 displays a normal automatic mode or a power mode corresponding to the deodorization mode set by the control unit 110. [

The control unit 110 controls the rotation speed and the operation time of the deodorization fan 131 according to the deodorization mode and allows the deodorization unit 130 to operate at predetermined intervals corresponding to the deodorization mode so that the air in the refrigerator is supplied to the filter 132 And the sterilizing lamp 133 to remove the smell.

For example, in the normal automatic mode, the deodorization unit 130 waits for 60 minutes after 10 minutes of operation, and repeats this operation at a cycle of 70 minutes. On the other hand, in the power mode, the deodorization unit 130 repeats the operation for stopping for 5 minutes after the operation for 10 minutes at a cycle of 15 minutes.

In particular, the control unit 110 detects the smell through the odor sensor 122 as the intensity of the odor becomes stronger after a predetermined time after the food is put in, and sets the deodorizing mode so that immediate deodorization is performed after the food is input.

In addition, when the odor sensor 122 is abnormal, the control unit 110 changes the power mode to the normal automatic mode. At this time, the control unit 110 uses the door switch when the odor sensor is abnormal, and sets the power mode based on the open time when the door is opened. That is, the control unit 110 detects that the food is inserted at the time when the door is opened, and operates the deodorization unit 130 in the power mode for a predetermined time after the door is opened to remove the odor.

The compressor driving unit 160 supplies operating power to operate the compressor 161 in response to the control command of the controller 110 and controls the operation of the compressor 161. [ At this time, the compressor driving unit 160 may include an inverter (not shown) and an inverter driving unit (not shown) for controlling the compressor 161.

The refrigerating compartment fan driving unit 150 controls the rotating operation and the rotating speed of the refrigerating compartment fan 151 so that the cool air exchanged with the refrigerating compartment 12 is supplied. Also, the freezer compartment fan driving unit 140 controls the rotation operation and the rotation speed of the freezer compartment fan 141 so that the cool air that has been heat-exchanged with the freezing compartment 13 is supplied.

The compressor (161) compresses the refrigerant to circulate the refrigerant in the refrigerator (1), and controls the temperature of the refrigerant discharged by adjusting the refrigerant. The refrigerating compartment fan (151) and the freezing compartment fan (141) are arranged such that the refrigerant heat-exchanged with the refrigerant by the heat exchanger is discharged to the refrigerating compartment and the freezing compartment, respectively.

3 is an exploded perspective view illustrating a configuration of a refrigerator deodorizer according to an embodiment of the present invention.

The deodorization unit 130 includes a deodorization fan 131, a filter 132, and a sterilizing lamp 133, as described above.

As shown in FIG. 3, the deodorizing units 130 and 16 are provided on the panel 17 installed on the inner wall of the refrigerating chamber 12. As shown in FIG. The panel 17 is installed on the inner wall surface of the refrigerating chamber 12 and can be installed in the refrigerating chamber. Further, the panel 17 is provided with an odor sensor 122 on the inner side thereof.

The deodorizing unit 16 and 130 are connected to the deodorizing fan 131, the fan case 135, the sterilizing lamp module 133a, the filter case 134, the plurality of filters 132, and the deodorizing case 136, A plate 137, and a deodorizer front case 138.

The deodorization fan 131 is inserted into the panel 17 and the fan case 135 supports the deodorization fan 131 so that the deodorization fan 131 is fixed to the panel 17. The sterilizing lamp module 133a is inserted and fixed in the sterilizing lamp 133 therein. At this time, the sterilizing lamp 133 is composed of at least one visible light LED. The deodorization case 136 is connected to the fan case 135 to cover the filter case 134 from the sterilizing lamp module 133a. The connection plate 137 connects the deodorization part case 136 and the deodorization part front case 138 and forms a space between the deodorization part case 136 and the deodorization part front case 138 .

The filter 132 is inserted into the filter case 134. The filter 132 includes a first photocatalytic filter 132a, a first deodorization filter 132b, a second deodorization filter 132c, and a second photocatalytic filter 132d. That is, the filter 132 is composed of two photocatalytic filters 132a and 132d and two deodorizing filters 132b and 132c. At this time, the configuration of the filter may be variable.

At this time, the filter 132 is divided into a front-end filter for firstly filtering relatively large floating substances (bacteria and dust) in the air inside the refrigerating chamber, and a filter for adsorbing fine particles and bacteria by a filter having air permeability .

The photocatalytic filters 132a and 132d are filters coated with a photocatalyst and disposed to directly face the sterilizing lamp 133 so as to receive a large amount of light emitted from the sterilizing lamp 133. The wider the range in which the light is irradiated to the filter 132, The power increases.

The deodorizing part case 136 and the filter case 134 are formed so that the sterilizing lamp module 133a and the filter 132 are spaced apart from each other by a predetermined distance so that light of the sterilizing lamp 133 is irradiated . At this time, the filter 132 and the sterilizing lamp 133 are arranged to be inclined by 20 to 45 degrees from the horizontal. In addition, since the filter 132 can maximize the photocatalytic effect as the area irradiated with the light is wider, a chip type LED is used for the LED of the sterilizing lamp 133.

Further, as the distance between the filter 132 and the sterilizing lamp 133 is increased, the irradiation range is widened but the light intensity is weakened. Therefore, the distance between the filter 132 and the sterilizing lamp 133 is set to 3 to 10 mm . At this time, the sterilizing lamp module 132a is silicon-coated to prevent the sterilizing lamp 133 from being damaged by water.

At this time, the photocatalytic filter reacts with the irradiated light by the photocatalyst coated on the surface, and generates electrons (e) and holes (particles that behave like electrons having h + and + charges) To generate superoxide, and holes react with moisture present in the air to generate a hydroxy radical (OH-).

Hydroxy radicals produced by this process are highly capable of oxidizing and decomposing strong organic materials, so they decompose bacteria, such as odorous substances, viruses and bacteria, which are always present in the air, to form water (H2O) and carbon dioxide (CO2) .

The photocatalytic reaction is a competitive reaction between the recombination of electrons and holes and the oxidation and reduction reactions. The longer the time that electrons and holes are generated and maintained, the more favorable the redox reaction. Therefore, when a metal such as Cu is used together, The effect can be increased.

Since the photocatalyst has a sterilization and deodorizing effect, the photocatalytic filters 132a and 132d have a deodorizing effect as well as a sterilization effect.

Although the photocatalytic filters 132a and 132d have a deodorizing effect, the deodorizing and decomposing velocities of the photocatalytic filters 132a and 132d are slow. Therefore, the deodorizing filters 132b and 132c are separately provided in the filter 132.

The deodorization filters 132b and 132c are made of activated carbon and are easy to adsorb and remove odors. Since the deodorization unit 130 includes two deodorization filters 132b and 132c and a pipe catalyst filter having a deodorization effect, the deodorization unit 130 can remove the odor in a short time.

At this time, since the deodorization filters 132b and 132c are provided between the first and second photocatalytic filters 132a and 132d, the light of the sterilizing lamp 133 is irradiated to the photocatalytic filter, And the odor is removed by the deodorizing filter. The deodorization filter may be a mesh type having a large pore size.

 Accordingly, the air passing through the deodorization unit 130 is not only sterilized but also the odor can be removed.

At this time, light of the sterilizing lamp 133 is also reflected and irradiated to the second photocatalytic filter 132d, which is a front-end filter farthest from the sterilizing lamp 133. [ In addition, since the deodorization filter is a mesh type, the light from the sterilizing lamp 133 passes through the second photocatalytic filter. The first photocatalytic filter is also made of a material through which light can pass, for example, a nonwoven fabric.

FIG. 4 is an exemplary diagram for explaining a position of a sensor for detecting odors of a refrigerator according to an embodiment of the present invention. Referring to FIG.

The odor sensor 122 is provided on the panel 17 provided with the deodorization units 130 and 16.

At this time, since the odor sensor 122 can not sense the odor when the odor is removed by the odor sensor 130, it is installed around the odor sensor 130 and 16, So that the user can sense the smell of the air which has not been detected.

In addition, in the case of a windy place, the flow of gas (odor particles) becomes unstable due to the wind flow, which causes a variation in the sensing performance of the odor sensor 122. Therefore, it is preferable that it is installed at a position which is away from the discharge port of the refrigerating compartment fan 151 by a predetermined distance, and is located around the deodorization unit 130 but less influenced by the wind of the deodorization unit 130.

Therefore, the odor sensor 122 is disposed in the upper part P3, the lower part P2, the left part P1, and the right part P4, except for the part where the odor sensor 122 and the deodorizing fan meet at right angles to the wind, And the odor in the air inside the refrigerator is measured on one side.

5 is a view showing a configuration of an odor sensor according to an embodiment of the present invention.

5 (a), the odor sensor 122 is composed of a sensor module 210, a case 220, a connector 221, and a signal line 222.

At this time, the sensor module 210 is fixed to the sensor board 224 and the sensor board 224 is provided with a processing circuit (not shown) for processing the signal of the sensor module 210 and transmitting the signal to the connector 221.

The sensor module 21, the connector 221, and the signal line 222 are molded in the case 220 by the waterproof material 223 and waterproofed.

The waterproofing material 223 protects the sensor 221 and the sensor module 210 from moisture and protects the processing circuit mounted on the sensor module 210 and the sensor board 224 and the connector 221, A part of the connector 221 is molded by the waterproofing material 223. The height of the waterproof material 223 is higher than the height of the minimum sensor board 224 and lower than that of the sensor module 210. When the waterproofing material 223 is molded higher than the upper end of the sensor module 210, the odor particles can not reach into the sensor module 210, so that the odor can not be detected. Urethane is used as the waterproof material 223. Urethane molding is used because silicone affects the performance of the sensor module 210 when used as the waterproof material 223.

5A and 5B, the sensor module 210 includes a sensor cap 211 for protecting an internal sensor and a sensor module 210 for detecting the sensor module 210 while being fixedly mounted on the sensor board 224, And a bridge 212 for applying a signal to the sensor board 224. The signal sensed by the sensor module 210 is applied to the sensor board 224 through the bridge 212 and applied from the processing circuit in the sensor board to the connector 221 to be supplied to the controller 110 ).

Although the sensor cap 211 is shown as a cylindrical shape, the shape of the sensor cap 211 is not limited to a cylindrical shape, but may be a rectangular shape, and any shape can be adopted as long as it protects the sensor from external impact.

The sensor cap 211 has at least one hole 213 formed therein. Preferably, four holes may be formed. The holes 213 of the sensor cap 211 are formed in such a size that the odor particles can be taken in and out so that the odor particles reach the sensor inside. In some cases, the upper part of the sensor cap 211 may be formed as a mesh network.

At this time, the sensor cap 211 is made of metal, and moisture may be generated on the surface of the sensor cap 211 due to the low temperature inside the refrigerator 1. [ However, since a part of the sensor module 210 is molded by the waterproofing material 223, even if moisture on the surface of the sensor cap 211 flows down, the operation is not affected.

In addition, the holes 213 may be blocked by water generated or moisture may penetrate into the sensor through the holes 213. However, since the sensor is provided with the element heating heater 204 described below, The heated air in the cap 211 moves to the upper end and is discharged to the outside through the hole 213. This prevents the hole 213 from being clogged by moisture or penetrating moisture through the hole 213 do.

The sensor is a semiconductor type gas sensor as an example. The semiconductor type gas sensor can be manufactured in a small size, operates at a low temperature, is simple to drive, and is easy to apply to a refrigerator that stores food without toxicity. Further, since the refrigerant flows into the refrigerator, it is preferable to use a semiconductor type gas sensor in which the critical temperature of the element heating heater of the sensor does not exceed a certain temperature in preparation for leakage of the refrigerant gas.

The sensor is composed of an element heating heater 204, a substrate 203, an electrode 202 and a sensing material 201.

The sensing material 201 reacts with particles in the air to generate a predetermined signal, and an n-type oxide semiconductor-based sensing material is used.

A variety of metal oxides may be used for the sensing material 201 depending on the gas to be sensed. For example, the sensing material 201 may be SnO2, ZnO, WO4, Fe2O3, In2O3. At this time, since the odor sensor 122 is installed in the refrigerator to sense the odor of the food, a sensing material that reacts to the odor of the food among the metal oxides described above is used. Since the smell of food is mainly H2S, TMA, MM, the sensing material can be In2O2, SnO2 which reacts to these gas components.

The element heating heater 204 heats the substrate 203 to allow the sensing material 201 to react. The substrate 203 is made of aluminum, and the element heating heater 204 is made of ruthenium oxide (RuO2).

When the temperature of the sensing material 201 becomes high, interaction with the gaseous molecules becomes active and proceeds to the interior of the semiconductor, and the concentration of defects in the oxide is affected, thereby changing the conductivity. Thus, the device heating heater 204 heats the substrate 203 to increase the reactivity of the sensing material 201.

Since the odor sensor 122 continuously operates, the element heating heater 204 of the sensor generates heat for a long time, so that the critical temperature of the element heating heater 204 does not exceed a certain temperature. Particularly, since refrigerant flows into the refrigerator 1, if the refrigerant gas leaks, there is a possibility that the refrigerant gas is ignited by the element heating heater 204 of the odor sensor 122. Therefore, for safety, the critical temperature of the element heating heater 204 is Use a low sensor. For example, a sensor whose critical temperature of the element heating heater 204 is 325 degrees or less is used.

 On the other hand, the element heating heater 204 generates heat and is contrary to the characteristic of the refrigerator 1 that stores the food by supplying cool air. The heated air inside the sensor cap 211 can be discharged to the outside through the hole 213 by the element heating heater 204 as described above. However, even if the temperature of the element heating heater 204 itself is high due to the heating of the element heating heater 204, the temperature change due to the element heating heater 204 is small at a predetermined distance from the sensor module 210, The heater 204 does not affect the internal temperature of the refrigerator 1.

The temperature of the sensor cap 211 for protecting the sensor is about 16 to 18 degrees and the temperature at a point 5 mm away from the sensor module 210 is about 1.7 to 2.3 degrees, and the temperature 2 cm away from the sensor module 210 was measured at about 0 to 0.1 degrees. A sensor cap 211 is provided around the sensor including the device heating heater 204 and a case 220 is provided outside the sensor cap 211. The sensor cap 211 is disposed outside the sensor cap 211 at a distance of 5 mm from the sensor module 210 The point is inside the case 220 and the temperature at a distance of 2 cm from the sensor module 210 is measured to be low so that the device heating heater 204 does not affect the temperature change around the odor sensor 122 .

The odor sensor 122 configured as described above senses the odor by outputting a corresponding signal as the electrical conductivity between the electrodes 202 changes when the sensing material 201 reacts with a substance in the air.

In the clean air, the odor sensor 122 combines the free electrons between the electrodes 202 with oxygen having a high affinity for the air in the air at the particle surface, so that the number of free electrons decreases, the electric conductivity decreases, .

On the other hand, in the contaminated air, that is, in the presence of the reducing gas, the reducing gas and the oxygen are combined and the oxygen gas on the surface of the sensing material 201 is reduced, whereby the free electrons are increased and the electric conductivity is increased. The resistance value correspondingly decreases.

Accordingly, in the contaminated air, the odor sensor 122 increases the electrical conductivity and the resistance value becomes smaller, so that the odor sensor 122 outputs a predetermined signal to sense the odor.

FIG. 6 is a graph showing sensor characteristics according to the type of waterproof material of the odor sensor according to an embodiment of the present invention.

Since the refrigerator 1 is configured to keep the temperature at a constant level by supplying cold air, the odor sensor 122 is waterproofed to protect the internal electric circuit which is vulnerable to moisture.

Particularly, as described above, the odor sensor 122 is mounted on the sensor module 210, the sensor board 224, the connector 221, and in particular, the sensor board 224, The waterproofing material 223 is molded. At this time, urethane is used as the waterproof material 223.

6A is a graph showing a signal change (S41) when the sensor of the odor sensor is exposed to urethane, and FIG. 6B is a graph showing a signal change (S42) when the sensor is exposed to silicon .

As shown in FIG. 6A, when the sensor that has not been subjected to the molding process is exposed to the urethane at the first time T41, the sensor can not detect the odor and the voltage of the output signal decreases After the lapse of a predetermined time, the smell is detected again at the second time (T42).

On the other hand, when the unprocessed sensor is exposed to silicon in the third time T43 as shown in FIG. 6 (b), the sensor can not detect the smell and the voltage of the output signal decreases. After the elapse of a predetermined time, the voltage of the output signal of the sensor rises at the fourth time T44, so that the sensor seems to operate. However, even if a predetermined time elapses, the voltage of the initial sensing signal is not reached, Can not.

When the voltage of the signal before the silicon exposure, that is, before the third time (T43) is the voltage of the normal odor detection signal, the normal odor detection signal can not be output after the silicon exposure.

Silicone is often used for waterproofing, but odor sensors can not detect odors when exposed to silicon. Therefore, the odor sensor 122 performs the molding process using the waterproofing material 223 of the urethane.

7 is a graph illustrating sensed signals according to the type of the odor sensor according to an embodiment of the present invention.

Gas sensors and dust sensors are used to detect odors. In order to select a sensor suitable for the smell of the food among the gas sensor and the dust sensor, a smell strong kimchi was put into the refrigerator (1) to compare sensed signals.

As shown in Fig. 7, when the kimchi was put in the first time T51, the dust sensor S52 did not show a change in the signal before and after the insertion of the kimchi.

On the other hand, in the case of the gas sensor S51, the sensing signal changed from the second time T52 after the lapse of a predetermined time after the insertion of the kimchi.

Thus, the odor sensor 122 uses a gas sensor that senses the smell of the food.

FIG. 8 is a graph showing a change in odor sensed according to the type of food put into the refrigerator of the present invention.

As shown in FIG. 8, when a food is put into the refrigerator 1, a smell is generated in the food. At this time, the odor sensor 122 senses the smell of food and outputs a signal. The sensed value of the odor sensor 122 is output as a voltage value, and the larger the voltage value, the more the odor is emitted.

According to the kind of the food, the change of the smell according to the lapse of time after putting radish, red pepper, bursl, onion, pork, mackerel, apple, kimchi, tangerine and water into the refrigerator (1) .

At this time, the food which is consumed a lot of various foods as the kind of food is selected as the pork meat, the mackerel fish, the Chinese cabbage, the onion, the radish, the pepper the vegetables, the apple and the mandarin orange fruit. Especially, , Peppers and apples were selected as fruit vegetables, radish and carrots were selected as representative vegetables with high purchase frequency as root vegetables, and the change of smell was detected. In general, the user generally selects a food to be frequently input into the refrigerator and senses the change of the smell.

In the case of radish, pepper, mushroom, onion H2S, pork, mackerel, ammonia and TMA, apple and tangerine ethylene, kimchi MM were measured. Therefore, H2S, TMA, and MM are set as representative food odors, and a gas sensor using In2O3 or SnO2 as a sensing material is used as an odor sensor.

In the early stage of the introduction of the food, a change in the value of the sensing signal by the odor sensor 122 appears to be great. In addition, although there is a difference in the size of the smell depending on the kind of food, it is the same in that the value of the detection signal greatly changes in the early stage of the food.

After a certain period of time has elapsed since the introduction of the food, the odor does not increase any more regardless of the type of food, and converges to a constant value.

In case of a strong smell, the smell is measured in a short time, but the size remains constant after a certain time. The kimchi, radish and mushroom are large in size at the initial stage, but even if the size of the food is small, the odor value is maintained at about 18 hours.

Therefore, the odor sensor 122 can detect the odor of the food, and especially the odor of the food in the early stage of the food, for various foods.

At this time, even in the case of water, there is an odor, but it is understood that the odor is weaker than other foods. Therefore, water has a small intensity of odor, so that it does not affect the odor detection using the odor sensor and thus the change of the deodorization mode.

FIG. 9 is a graph showing the change of odor according to the deodorization mode setting of the refrigerator of the present invention.

As shown in Fig. 9, the odor of the inside of the refrigerator 1 is sensed by the odor sensor 122. Since the odor sensor 122 is a gas sensor, it senses the gas concentration.

In the initial section D0, the odor sensor 122 measures the odor generated from the food after being introduced into the refrigerator 1. [ At this time, the deodorization unit 130 operates in the normal automatic mode. The deodorization unit 130 controls the deodorization fan 131 for about 10 minutes in the normal automatic mode, waits for 60 minutes, and operates repeatedly at a cycle of 70 minutes.

As described above, the smell of food has a constant value (concentration) over time, and when the smell sensor 122 generates a new smell, the change in the sensed value is large.

When the food is put in the first time T11, the gas concentration inside the refrigerator increases due to the odor generated from the food, and the odor sensor 122 senses the smell of the newly introduced food.

The control unit 110 changes the deodorization mode from the normal automatic mode to the power mode in response to the detection signal of the odor sensor 122. [ Accordingly, in the first section D1, the deodorization unit 130 operates in the power mode.

When the power mode is set, the deodorization unit 130 operates, and the air sucked into the deodorization unit by the deodorization fan 131 is sterilized and deodorized while passing through the filter.

At this time, the deodorization unit 130 operates the deodorization fan 131 for 10 minutes in the power mode, stops operation for 5 minutes, and repeats the operation in a cycle of 15 minutes. Therefore, the deodorizing unit 130 is repeatedly operated to remove the odor.

When the power mode is set, the deodorizing unit 130 operates to remove the odor, so that the gas concentration inside the refrigerator decreases.

When the gas concentration sensed by the odor sensor 122 decreases, the control unit 110 changes the deodorizing mode from the power mode to the normal automatic mode at the second time T12. Accordingly, in the second section D2, the deodorization unit 130 repeats the operation of operating the 10-minute deodorization fan 131 for a period of 70 minutes and stopping for 60 minutes.

In the normal automatic mode, the deodorization performance is degraded because the deodorization fan 131 operates for 10 minutes and stops.

When food is newly introduced into the refrigerator 1, the control unit 110 changes the deodorization mode to the power mode at the third time T13, and the deodorization unit 130 changes the power mode Remove the smell by operating. As a result, the gas concentration in the refrigerator decreases again.

10 is a diagram for explaining a method of detecting odor and deodorizing in a refrigerator of the present invention.

The control unit 110 receives the detection signal of the odor sensor 122, determines the intensity of the odor, and changes the deodorization mode accordingly to control the deodorization unit 130.

The sensing signal input from the odor sensor 122 to the control unit 110 is a voltage value of 0 to 5V. The control unit 110 changes the voltage value of the input sensed signal to a resistance value and determines the intensity of the smell.

In the detection signal, the voltage value is large as the gas concentration is high and the smell is strong, and the voltage value is small as the gas concentration is low and the smell is weak. Since the detection value is calculated by changing the voltage value of the sensing signal to the resistance value, the smaller the sensing value is, the stronger the smell, and the larger the size, the weaker the smell. At this time, the controller 110 determines the change of the smell using the relative detection method. That is, the control unit 110 uses a relative value, not a magnitude of the absolute value of the odor, to determine whether the odor has increased / increased or the odor has decreased / decreased. In order to determine the relative change, the controller 110 changes the voltage value of the sensing signal to a resistance value to calculate the sensing value.

At this time, the control unit 110 calculates the reference value Ro and the current value Rs based on the sensed value calculated from the sensed signal, and changes the odor according to the ratio of the reference value Ro to the current value Rs . The control unit 110 determines whether the smell is stronger or smell is removed than before based on the ratio of the reference value Ro to the current value Rs based on the ratio of the previous and the current smell to the smell.

Accordingly, when the current value Rs / the reference value Ro is determined as the pollution degree, the controller 110 increases the pollution degree as the value of the pollution degree becomes smaller and the smell becomes stronger. As the value of the pollution degree becomes larger, It is judged that the smell is weakened.

For example, when new food is added and the smell becomes strong, the degree of contamination increases, and when the smell is removed by the deodorization unit 130, the degree of contamination decreases.

The control unit 110 sets the deodorization mode to the power mode if the value of the current value Rs / reference value Ro is equal to or smaller than the set value. Here, the set value is set based on the gas concentration that the user feels strong smell.

The control unit 110 calculates the average of the sensed signal of the odor sensor 122 over a predetermined period of time, determines the intensity of the odor based on the average value, and changes the deodorizing mode. The refrigerator (1) repeats the supply of cold air according to the circulation of the refrigerant so that the temperature inside the refrigerator reaches and maintains the set target temperature. In such a refrigerator, the air flow and the temperature of the inside of the refrigerator may be changed according to the driving cycle, and accordingly, the value of the sensing signal of the odor sensor 122 may be varied, so that the controller 110 calculates the average value to determine the intensity of the odor.

The control unit 110 calculates a sensed value corresponding to the continuously input sensed signal and recalculates the reference value Ro and the current value Rs at predetermined time intervals using the sensing value. Here, the current value Rs is an average of values measured within a predetermined period of time, and the reference value Ro is an average value of the values measured within a predetermined period of time except for the time at which the current value is calculated.

In this case, the reference value is a value that is re-calculated and changed at a predetermined period as described above, and is not a fixed value. Therefore, the reference value of the first time is different from the reference value of the second time, and the pollution degree thus calculated becomes a relative value based on time. That is, as described above, the degree of contamination is judged whether or not the smell is stronger or weaker than before, and it is not to be compared whether the absolute value is larger or smaller.

For example, the controller 110 may calculate an average of the sensed values of the sensing signals input from the odor sensor 122 for the last 10 minutes as a current value Rs, Is calculated as a reference value.

The controller 110 calculates an average of the sensed values for the previous one hour as a reference value Ro, except for 10 minutes used for calculating the current value. That is, the previous 1 hour is the average value for the previous 1 hour based on 10 minutes before, excluding 10 minutes used for calculating the present value. Therefore, the present value is the average of the detection values for the detection signals inputted from 10 minutes ago to the present, and the reference value is the average of the detection values for the detection signals inputted from 70 minutes before to 10 minutes ago.

In addition, the controller 110 computes the sensed value in units of one minute to calculate the current value Rs and the reference value Ro in units of ten minutes.

The control unit 110 computes the sensed value at the end of the first minute and calculates a current value Rs by calculating a plurality of sensed values for 10 minutes, that is, an average of 10 sensed values, And calculates it as a reference value. At this time, the current value Rs is the average of the sensing values for 10 minutes, and is calculated in units of 10 minutes, so that the reference value Ro is an average of the current values calculated in one hour. That is, the average value of the six current values calculated in one hour is calculated to calculate the reference value.

As shown in FIG. 10A, the control unit 110 determines whether or not the sensing value measured during the second interval P32 from the last 10 minutes, that is, Tn-1 time to the current Tn, And the current value Rs1 of the current Tn is set. Also, the controller 110 sets the reference value Ro1 for the current Tn as the average of the detection values measured during the first interval P31 from Tn-1 hours before 10 minutes to Tn-3 hours before 1 hour.

As described above, since the current value and the reference value are re-calculated in units of 10 minutes, the reference value (Ro2) for Tn + 1 in Tn + 1 time after 10 minutes is Tn + 1 Is calculated as an average of the sensing values measured during the third section P33. Here, the current value Rs2 of Tn + 1 is calculated as an average of the detection values measured during Tn + 1 and the fourth period P34 of Tn.

As shown in FIG. 10 (b), the sensing values R0 to R20 are calculated in units of one minute, and the current values Rs1 and Rs2 are calculated by calculating an average of the sensing values. Accordingly, the current value Rs1 of Tn is calculated by calculating the average of the ten sensing values R0 to R9 measured during the second interval P32 from the time Tn-1 to the current time Tn, The current value Rs2 for Tn + 1 is calculated by calculating the average of the ten sensed values R10 to R19 calculated during the fourth period P34 of the first period P34.

A current value Rs1 of Tn + 1 and a current value Rs2 of Tn + 1 are calculated, and the reference value is calculated from the previous one hour, that is, from Tn-3 time to Tn-1 time during the first section P31 The reference value Ro1 of Tn is calculated by calculating the average of the sensing values of the first period P31, that is, the average of the sixty sensing values calculated during the first period P31. That is, it is possible to calculate the reference value Ro1 of Tn by calculating the average of the six current values calculated during the first section P31.

The reference value Ro2 of Tn + 1 is calculated by calculating the average of 60 detection values or six current values calculated during the third interval P33 from Tn-2 time to Tn time.

The calculation of the average of one hour before 10 minutes excluding the 10 minutes in which the reference value is used for the calculation of the current value is to calculate the current value of Tn-1 excluding the current value Rs1 calculated in Tn as the reference value Ro1 of Tn (Rs0) is calculated and calculated. The reference value Ro2 of Tn + 1 is calculated by calculating an average including the current value Rs1 calculated at Tn.

The control unit 110 calculates the change of the odor, that is, the degree of contamination over time based on the re-calculated reference value Ro and the current value Rs, and compares the contamination degree of the Tn time with the contamination degree of the Tn + 1 hour Set the deodorization mode. At this time, the pollution degree of Tn time is Rs1 / Ro1, and the pollution degree of Tn + 1 hour is Rs2 / Ro2.

If the contamination degree of the Rs / RO is less than the predetermined value, the controller 110 determines that the smell is stronger than the previous one and changes the deodorization mode to the power mode. The deodorization unit 130 operates according to a control command of the control unit 110, and the deodorization fan sucks air in the refrigerator. Accordingly, the sucked air passes through the filter to remove germs and foreign substances in the air and also removes the smell.

In the power mode, the deodorizing fan repeats the operation for stopping for 5 minutes after the operation for 10 minutes for the set time according to the control command of the control unit 110. [

After the deodorization mode is changed to the power mode, the odor sensor 122 continuously inputs a detection signal to the controller 110. The controller 110 calculates a sensed value of the sensed signal and outputs the sensed value as the reference value Ro and the current value Rs. To determine the degree of contamination.

At this time, when the current value Rs calculated during operation in the power mode is larger than the reference value just before the power mode is changed, the controller 110 changes the deodorization mode to the normal automatic mode. If the calculated degree of contamination is greater than the set value during operation in the power mode, the control unit 110 changes the deodorization mode to the normal automatic mode.

11 is a flowchart illustrating a control method for deodorization of a refrigerator according to an embodiment of the present invention.

11, during operation of the refrigerator 1, the odor sensor 122 measures the odor inside the refrigerator and inputs a sensed signal to the controller 110 (S310).

The control unit 110 calculates a sensed value for the smell from the sensing signal input from the odor sensor 122, and calculates a reference value and a current value for determining the change of the odor in the refrigerator (S320).

At this time, the controller 110 converts the voltage value of the sensing signal into a resistance value to calculate a sensing value, and calculates a reference value and a current value using an average of the sensed values. The control unit 110 calculates the detection value in units of one minute, calculates the current value as an average of the last 10 minutes, and calculates the current value of the previous 1 hour, the 10-minute detection value The average is calculated to calculate a reference value.

When the odor is strong, the odor sensor 122 reacts with the odor particles and the voltage is measured to be high. When the odor is weak, the odor sensor 122 reacts with the odor particles so that the voltage is low. Therefore, the detection value is a resistance value, so it is calculated low when the smell is strong and high when the smell is weak. The present value and the reference value are also calculated to be low when the smell is strong and high when the smell is weak.

The controller 110 compares the ratio between the current value and the reference value with the set value to determine the degree of contamination inside the refrigerator (S330). At this time, the value obtained by dividing the current value by the reference value is regarded as the contamination degree, and the change relative to the smell in the refrigerator is determined.

That is, the ratio of the intensity of the smell of the previous 1 hour to the intensity of the smell of the last 10 minutes is calculated. If the value is less than the set value, it is determined that the smell is stronger, especially the smell is stronger than the previous one hour. It is judged that the smell is weaker than the previous one hour.

If the contamination degree is less than the set value, the controller 110 changes the deodorization mode from the normal automatic mode to the power mode (S340).

On the other hand, if the contamination level is equal to or greater than the set value, the controller 110 maintains the normal automatic mode (S390). At this time, if the deodorization mode is the power mode, if the degree of contamination is equal to or greater than the set value, it is determined that the odor has decreased and the controller 110 changes the deodorization mode to the normal automatic mode.

The control unit 110 controls the deodorization fan 131 of the deodorization unit 130 in response to the deodorization mode change and the deodorization fan 131 operates according to the control command to suck the air inside the refrigerator S350. The sucked air is sterilized and deodorized while passing through the filter inside the deodorizer 130. [ The filter is provided with an antibacterial filter and a deodorizing filter.

At this time, the deodorizing fan 131 repeatedly operates in the normal automatic mode for about 10 minutes and then for 60 minutes in the normal automatic mode, and repeats operation for 10 minutes in the power mode and 5 minutes in the power mode.

The odor sensor 122 continuously measures the odor of the inside of the refrigerator (S360), and inputs the odor to the control unit (110).

As described above, the control unit 110 calculates a sensing value for the sensing signal and calculates a current value and a reference value according to the sensing value.

After the deodorization mode is changed from the normal automatic mode to the power mode, the controller 110 compares the calculated current value with the reference value before deodorization mode change (S370).

At this time, if the current value is larger than the reference value before the deodorization mode change, it is determined that the odor is weak and the deodorization mode is changed to the normal automatic mode (S390).

On the other hand, if the current value is equal to or lower than the reference value before the deodorizing mode change, the power mode is maintained. If the power mode is maintained, the controller 110 determines whether the set time has elapsed after changing the deodorizing mode (S380). At this time, the controller 110 sets the set time so that the power mode does not exceed a maximum of 5 hours.

When the preset time has not elapsed, the control unit 110 compares the ratio of the current value with the reference value, that is, the degree of contamination with the set value to maintain or change the deodorizing mode.

If the set time has passed after the deodorization mode change, the controller 110 cancels the power mode and changes to the automatic mode (S390).

12 is a diagram illustrating an example of a display unit in which a deodorization mode of a refrigerator according to an embodiment of the present invention is displayed.

When the deodorization mode is not set, the display unit 180 does not display information on the deodorization mode as shown in Fig. 12 (a) in the off state.

On the other hand, if the deodorization mode is set, the display unit 180 displays icons and characters for the normal automatic mode as shown in FIG. 12 (b) in the normal automatic mode, Displays the icon and its corresponding character. For example, in the normal automatic mode, the deodorization mode icon and 'sensing' are displayed. In the power mode, the deodorization mode icon and the 'power sensing' are displayed.

At this time, the setting for the deodorizing mode may be not only the icon but also the corresponding image, character, and special character, and may be displayed by combining at least one of them, and the lamp may be turned on in response to the occasion.

As described above, when the deodorization mode is changed, the controller 110 controls the display unit 180 to output information on the deodorization mode.

As described above, the present invention includes an odor sensor to measure the odor inside the refrigerator, thereby automatically changing the deodorization mode according to the degree of odor generated from the food, and operating the deodorizer to remove the odor. Thereby reducing the user's discomfort due to the smell. Further, when the smell is strong, the deodorizing unit is operated, and the filter whose lifetime is determined can be used more effectively.

It will be understood by those skilled in the art 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 above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

1: Refrigerator
110: control unit 120:
121: temperature sensor 122: odor sensor
130: Deodorization unit 131: Deodorization fan
132: filter 133: sterilization lamp
161: compressor 170: input part
180:
210: Sensor module 223: Waterproofing material
224: Sensor board 211: Sensor cap
201: sensing material 204: element heating heater

Claims (35)

A case partitioned by a refrigerating chamber and a freezing chamber to form an internal space;
A door for opening and closing the refrigerator compartment;
A panel mounted on an inner wall surface of the refrigerating chamber;
A deodorizing unit coupled to the panel and configured to remove air from the inside of the refrigerating chamber to remove the odor;
A deodorization case housing the filter and having a space in which air can be taken in and out;
An odor sensor mounted on the panel at a position spaced apart from the deodorizer case; And
A first average value during a first set time of the sensed value sensed by the odor sensor and a second average value during a second set time after the first set time are compared to control the operation of the deodorant fan The refrigerator comprising: The method according to claim 1,
The control unit controls the deodorizing pan by using the first average value as a reference value and the second average value as a current value and determining the concentration of the odor according to the ratio of the first average value and the second average value Refrigerator. 3. The method of claim 2,
Wherein the control unit re-calculates the first average value and the second average value by a predetermined time unit, and determines a change in relative odor through the continuously changed reference value and the current value. The method of claim 3,
Wherein the control unit calculates the sensed value of the odor sensor in a first time unit,
Wherein the concentration of the odor is determined by recalculating the first average value and the second average value in a second time unit larger than the first time. 3. The method of claim 2,
Wherein the control unit compares a value obtained by dividing the current value by the reference value with a preset value and determines that the odor has increased when the value is less than the set value and determines that the odor has decreased when the value is equal to or larger than the set value. The method according to claim 1,
Wherein the controller determines the concentration of the odor by calculating an average of the sensed values corresponding to the flow and temperature of the air in the refrigerating compartment that is changed according to a refrigeration cycle of the refrigerator. The method of claim 1, wherein
Wherein the control unit sets the deodorizing fan to operate in a deodorizing mode of either a normal automatic mode or a power mode, and controls the rotational speed and the operating time of the deodorizing fan. 8. The method of claim 7,
Wherein when the deodorization mode is changed, the controller re-calculates the first average value and the second average value to determine a change in smell. 8. The method of claim 7,
When the deodorizing mode is changed,
The first average value calculated before the deodorization mode is changed,
And comparing the second average value calculated after the deodorization mode is changed to determine a change in smell. 9. The method of claim 8,
After the deodorization mode is changed to the power mode,
Wherein the controller changes the deodorizing mode by comparing the re-calculated ratio of the first average value to the second average value with a predetermined set value. 8. The method of claim 7,
Wherein the control unit releases the power mode when the deodorizing fan is maintained in the power mode for a set time. The method according to claim 1,
Wherein the odor sensor is a semiconductor type gas sensor. The method according to claim 1,
Wherein the odor sensor includes any one of In2O2 and SnO2 which reacts with H2S, TMA, and MM, which are food odors, as a sensing material. 14. The method of claim 13,
Wherein the odor sensor further comprises an element heating heater for heating the sensing material,
Wherein the element heating heater has an exothermic temperature of 325 degrees or less below the ignition point of the refrigerant gas inside the refrigerator. The method according to claim 1,
Wherein the odor sensor is small, is operable at low temperatures, and is made of a material that is not toxic. The method according to claim 1,
Wherein the odor sensor is molded with urethane and waterproofed. 14. The method of claim 13,
Wherein the odor sensor further comprises a sensor cap to protect the sensing material,
Wherein the sensor cap is formed with a hole for inserting and discharging odor particles in the air. The method according to claim 1,
Wherein the deodorizing unit is configured to suck indoor air of the refrigerator in which food is stored according to a control command of the controller and to allow the sucked air to pass through the filter. The method according to claim 1,
The genital filter includes a photocatalytic filter and a deodorizing filter,
Wherein particles of air are adsorbed and removed by the photocatalytic filter while air sucked by the deodorizing fan passes through the filter, and the odor is removed through the deodorizing filter. 20. The method of claim 19,
Wherein the filter includes at least two deodorization filters. 8. The method of claim 7,
Further comprising a display unit for displaying at least one of an image, an icon and a character corresponding to the deodorizing mode. The odor sensor installed on a panel mounted on an inner wall surface of the refrigerating compartment of the refrigerator in which the inner space is partitioned by the case into a refrigerating compartment and a freezing compartment, the method comprising the steps of: sensing the odor inside the compartment of the refrigerator;
Comparing a first average value of the sensed value sensed by the odor sensor with a first mean value during a second set time period after the first set time period to determine a change in odor;
Operating the deodorizing pan coupled to the panel in accordance with the change of the odor; And
And the air in the refrigerating compartment is discharged by the deodorizing fan through a filter accommodated in a deodorizing case having a space through which air can flow in and out. 23. The method of claim 22,
The step of determining the change of the odor may include determining the concentration of the odor according to the ratio of the first average value and the second average value with the first average value as the reference value and the second average value as the current value Wherein the refrigerator is a refrigerator. 24. The method of claim 23,
The step of determining the change of the odor may include re-calculating the first average value and the second average value on a predetermined time basis to determine a change in relative odor through the continuously changed reference value and the present value Of the refrigerator. 25. The method of claim 24,
The step of judging the change of the odor may include comparing the value obtained by dividing the current value by the reference value with a set value and judging that the odor is increased when the value is less than the set value and judging that the odor is decreased when the value is not less than the set value Of the refrigerator. 23. The method of claim 22,
The step of determining the change of the odor may include computing the sensed value of the odor sensor in a first time unit and re-calculating the first average value and the second average value in a second unit of time greater than the first time To determine the concentration of the odor. 23. The method of claim 22,
Wherein the step of determining the change of the odor comprises determining the concentration of the odor by calculating an average of the sensed values corresponding to the flow of the air and the temperature of the air in the refrigerating compartment which is changed according to the refrigeration cycle of the refrigerator, / RTI > 23. The method of claim 22,
Wherein the operation of the deodorizing fan is controlled by controlling the rotational speed and the operating time of the deodorizing fan so that the deodorizing fan operates in either a normal automatic mode or a power mode. 29. The method of claim 28,
Further comprising re-calculating the first average value and the second average value when the deodorization mode is changed to re-determine the change of the smell. 29. The method of claim 28,
When the deodorization mode is changed,
Further comprising the step of comparing the first average value calculated before the deodorization mode is changed and the second average value calculated after the deodorization mode is changed to determine a change in the smell. 29. The method of claim 28,
After the deodorization mode is changed to the power mode,
Further comprising changing the deodorizing mode by comparing a re-calculated ratio of the first average value to the second average value with a predetermined set value. 29. The method of claim 28,
And releasing the power mode and setting the normal automatic mode when the smell decreases after the power mode is set. delete delete delete

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