TWI697600B - Dryer and method of controlling the same - Google Patents

Abstract

Disclosed are a dryer and a method of controlling the same, the dryer which is capable of: quickly and accurately determining an amount of laundry loaded in the dryer and controlling a drying operation according to the amount of the laundry; measuring a current supplied to rotate the drum and extracting a force applied to laundry in the drum to measure an amount of the laundry, thereby minimizing an error in the amount of laundry and thus enhancing accuracy of the measurement and improving a drying time; setting a drying time in consideration of both a calculated amount of laundry and a type of the laundry, such that damage to the laundry is prevented and over-drying or less-drying of the laundry is solved, thereby efficiently drying the laundry.

Description

Clothes dryer and its control method

The invention relates to a clothes dryer and a control method thereof.

Generally, a laundry treatment apparatus is an apparatus for treating laundry through various operations such as cleaning, dehydrating, and/or drying operations, and generally refers to washing machines, dehydrating machines, and clothes dryers.

The clothes dryer is a device that blows heated air into the drum with wet clothes while rotating the drum to dry the clothes.

According to how to treat the wet air discharged from the drum after the clothes are dried, the clothes dryer can be classified into an exhaust type clothes dryer and a condensation type clothes dryer. In addition, the clothes dryer uses the heat energy discharged during the exhaust or condensation process through the heat pump to reduce energy consumption.

Such a clothes dryer uses heated air to dry the clothes, and therefore the clothes dryer is configured to set a drying time according to the type of clothes instead of the amount of clothes, so that the clothes are dried for a predetermined period of time.

By distinguishing between heat-sensitive clothing and heat-insensitive clothing, the operating mode is set. In this way, in order to prevent damage to the clothing due to heat, the heat-sensitive clothing is dried in a short period of time, and the Clothes that are not sensitive to heat are dried to completely dry.

In addition, Japanese Patent Application Publication No. 2007-108870 employs a technique of changing the drying time based on temperature instead of the amount of laundry.

The clothes dryer has a drum that constantly rotates at a preset rotation speed, and when the clothes dryer performs a drying operation on the same laundry at a preset time period, the drying state of the laundry may be different according to the amount of laundry. In addition, if the temperature is increased, the drying speed can be increased, but this may cause damage to the clothes, and therefore, there is a limit in increasing the temperature.

In addition, if the drying time is increased, the drying operation cannot be terminated at the initially set time point, thereby increasing the inconvenience of the user.

US Patent No. 1414624 discloses accurately calculating the remaining time by sensing the amount of laundry and displaying the remaining time, so as to solve the problem that the user may misunderstand the drying time when the drying time is reset during the drying operation.

To this end, the sensed amount of laundry is described, but the manual is mainly about displaying the remaining time, and the prior art only discloses the sensed amount of laundry, rather than a detailed method. Therefore, it does not propose to use measurement to determine Specific methods to increase the amount of clothes and improve the accuracy of judgment.

In addition, Korean Patent No. 1505189 discloses the use of current flowing in a motor to sense the amount of laundry. The invention describes the step of accelerating the motor and the step of maintaining the motor at a constant speed to sense the accurate amount of laundry, and proposes to use the current value to calculate the amount of laundry in the acceleration step and the maintenance step.

However, there is a limitation in applying this prior art to a clothes dryer because the prior art is a method applied to a washing machine. In addition, the method of setting the operating time according to the amount of laundry has been applied to the conventional washing machine.

However, unlike the washing machine, in the dryer, wet clothes are loaded, so there is a difference in the weight between the dry clothes and the wet clothes, and the rotation speed does not change much during the drying process of the clothes dryer. While the friction and falling of clothes are used to remove foreign objects, while clothes dryers are designed to dry clothes, clothes dryers and washing machines are driven in different ways, therefore, there are limitations in applying the method of washing machines to clothes dryers.

In particular, because wet laundry is heavier than dry laundry, a considerable amount of current is required for initial driving, and the amount of laundry can be measured differently according to the initial position of the laundry and the movement of the laundry driven by a motor. In addition, unlike washing machines, clothes dryers use heated air and the rotation of the drum to dry clothes instead of dewatering wet clothes through centrifugal force. Therefore, when the drum rotates at a high speed, the clothes are dried without touching the drum. And, when the drum rotates at a low speed, the laundry does not move sufficiently, so only part of the laundry is dried.

Compared with dry clothes, wet clothes tend to stick to the wall of the drum. Therefore, unlike the washing machine that rotates with the drum, the problem with the clothes dryer that pulls the clothes and drops them to dry them is that when When the laundry is attached to the wall of the drum, the drying performance is significantly reduced.

Therefore, unlike the washing machine, the rotation of the drum needs to be considered to easily pull the wet laundry and drop the laundry.

In addition, there is a problem that the measured amount of laundry varies according to the method of rotating the drum of the dryer and the speed and time of the rotating drum.

Different problems may occur depending on the connection between the motor and the drum and the method of rotating the drum, and the problem must be solved.

In particular, when the pulley type driving method is applied, slip between the belt and the drum may occur. The pulley method is a method in which when the belt connected to the motor moves during the operation of the motor, the roller in contact with the belt rotates through the movement of the belt. Since slip between the belt and the drum occurs when the motor rotates at a high speed, there is a problem that the drum does not rotate a preset number of times.

In addition, if the laundry contained in the dryer increases, driving power as large as the increase in the weight of the laundry is required, but in the method of pulling by a belt, the load is significantly increased, and thus slipping is more likely to occur.

The invention provides a clothes dryer and a control method thereof. The clothes dryer can quickly and accurately determine the amount of laundry loaded into the dryer and control the drying operation according to the amount of laundry.

In addition, the present invention provides a clothes dryer and a control method thereof, which dry clothes by controlling pulling and dropping clothes.

In a general aspect of the present invention, there is provided a clothes dryer, including: a motor connected to a drum via a transmission belt and configured to rotate the drum; and a blowing fan configured to circulate through the drum The air responds to the drive of the motor; a drive controller is configured to apply operating power to the motor in order to operate or stop the tire motor and to control the speed of the motor; a current sensing unit is configured to measure the The current value of the motor; and a controller configured to apply a control command to the drive controller to control the motor to rotate the drum, and according to the current sensing unit sensed while the drum is rotating The current value senses the amount of laundry, wherein the controller is further configured to perform control when the amount of laundry is sensed to increase the rotation speed of the drum to a preset target rotation speed, and control the acceleration of the rotation speed of the drum until it reaches Up to the target speed.

In an acceleration phase in which the rotation speed of the drum increases to the target rotation speed, the controller may be further configured to control the rotation speed of the drum according to a resolution and a linearity relative to the amount of laundry calculated based on the current values. Acceleration.

The controller may be further configured to control the rotation speed of the drum corresponding to the acceleration gradient of the motor as an acceleration gradient set in the range of 300 rpm/s to 1700 rpm/s.

In another general aspect of the present invention, there is provided a clothes dryer including: a motor connected to a drum via a transmission belt and configured to rotate the drum; and a blowing fan configured to circulate through the drum The air of the drum responds to the drive of the motor; a drive controller is configured to apply operating power to the motor to operate or stop the motor, and to control the speed of the motor; a current sensing unit is configured to measure the The current value of the motor; and a controller configured to apply a control command to the drive controller to control the motor to rotate the drum, and according to the current sensing unit sensed while the drum is rotating The current value senses the amount of the laundry, wherein the controller is further configured to, when the amount of the laundry is sensed, by judging an acceleration phase in which the rotation speed of the drum increases and a maintenance that the rotation speed remains unchanged The control is performed in the phase, and the control is performed so that in the acceleration phase, the rotation speed of the drum is increased by an acceleration gradient set in the range of 500 rpm/s to 1500 rpm/s corresponding to the acceleration gradient of the motor.

The controller may be further configured to correspond to the acceleration gradient of the motor as an acceleration gradient set in the range of 500rpm/s to 1000rpm/s or in the range of 1250rpm/s to 1500rpm/s in the acceleration phase Control the speed of the drum.

The controller may be further configured to increase the rotation speed of the drum with an acceleration gradient corresponding to the acceleration gradient of the motor of 750 rpm/s in the acceleration phase according to a resolution and a linearity relative to the amount of laundry.

In yet another general aspect of the present invention, there is provided a clothes dryer, including: a motor connected to a drum via a transmission belt and configured to rotate the drum; and a blowing fan configured to circulate through the drum The air of the drum responds to the drive of the motor; a drive controller is configured to apply operating power to the motor so as to operate or stop the motor, and to control the rotation speed of the motor; a current sensing unit is configured to Measuring the current value of the motor; and a controller configured to apply a control command to the driving controller to control the motor to rotate the drum, and according to the current sensing unit sensed by the current sensing unit while the drum is rotating The measured current value senses the amount of laundry, wherein the controller is further configured to distinguish between an acceleration phase in which the rotation speed of the drum increases to a target preset rotation speed and a maintenance phase in which the rotation speed remains unchanged; Phase and the current value sensed in the maintenance phase to calculate the amount of laundry; the rotation speed of the drum is controlled to be set according to a linearity and a resolution An acceleration gradient is determined, wherein the linearity represents the change of the measurement value according to the increase of the laundry amount, and the resolution represents the measurement range according to the laundry amount.

In another general aspect of the present invention, a method for controlling a clothes dryer is provided, which includes: when laundry is loaded, rotating a drum by driving a motor; and accelerating the rotation speed of the drum to a preset target rotation speed ; After an acceleration phase, maintain the rotation speed of the drum in a maintenance phase; calculate the amount of laundry by sensing the current value measured in the motor while the drum is rotating; and perform a drying according to the amount of laundry Operation, wherein the acceleration of the rotation speed of the drum includes controlling the acceleration of the rotation speed of the drum until the target rotation speed is reached.

The acceleration of the rotation speed of the drum includes increasing the rotation speed of the drum with an acceleration gradient set in the range of 300 rpm/s to 1700 rpm/s corresponding to the acceleration gradient of the motor. The method is characterized by: rotating the drum by driving the motor when the laundry is loaded; increasing the rotation speed of the drum in the acceleration phase; maintaining the rotation speed of the drum in the maintenance phase after the acceleration phase; Sense the current value measured in the motor to calculate the amount of laundry; and perform a drying operation based on the amount of laundry, where in the acceleration phase, the acceleration gradient corresponding to the motor is set in the range of 500rpm/s to 1500rpm/s An acceleration gradient increases the rotation speed of the drum.

The method may further include: after the maintenance phase, changing the rotation direction of the drum; and repeating the acceleration phase and the maintenance phase a preset number of times.

The features of the present invention include: rotating the drum by driving the motor; in the acceleration phase, accelerating the rotation speed of the drum to a preset rotation speed; in the maintenance phase, maintaining the rotation speed of the drum unchanged; and by sensing while the drum is rotating Calculate the amount of laundry based on the current values sensed in the motors in the acceleration phase and the maintenance phase; and perform a drying operation based on the amount of laundry. In the acceleration phase, when the amount of laundry is sensed, the acceleration gradient is set based on the resolution and linearity The rotation speed of the drum is increased, where the resolution represents the measurement range according to the amount of laundry, and the linearity represents the change of the measurement value according to the increase of the amount of laundry.

In this way, the clothes dryer and its control method have the following advantageous effects: measure the current supplied to the drum to rotate, obtain the force acting on the clothes loaded in the clothes dryer, and calculate the amount of clothes, thereby minimizing the amount of clothes Error and improve accuracy.

The present invention can sense the amount of wet laundry.

The present invention can control the rotation speed to the extent that the wet laundry is lifted and dropped while moving along with the rotation of the drum.

The invention can control the rotation speed of the drum to adjust the movement of the laundry, thereby improving the drying efficiency of the laundry and improving the drying time.

The present invention can set the acceleration phase in which the rotation of the drum is increased to be longer than the maintenance phase, so that the driving force of the motor can be effectively transmitted to the drum.

The invention can solve the slippage between the belt and the drum connecting the motor and the drum. The present invention can set the drying time considering both the calculated amount of laundry and the type of laundry, thereby preventing damage to the laundry.

The invention can solve the problem of over-drying or under-drying of clothes, so that the clothes can be dried effectively.

In addition, the present invention changes the setting in response to the state of the laundry sensed during the drying operation, and operates according to the sensed state of the laundry, and therefore, the drying operation can be completed within a preset drying time.

The present invention can improve drying efficiency and prevent unnecessary movement of users, because the drying operation is completed within a preset time period, thereby significantly improving convenience and improving product reliability.

1: Dryer

9: clothing

10: Chassis

11: Front cover

12: side cover

13: side cover

14: Pedestal

15: back cover

16: top plate

17: Control Panel

18: Electrode

19: Filter assembly

20: door

22: Door glass

30: roller

31: Lifter

50: Compressor (thermal pump module)

52: Condenser (thermal pump module)

53: Evaporator (thermal pump module)

54: auxiliary heat exchanger (heat pump module)

58: Cooling fan (thermal pump module)

59: Expansion valve (valve)

60: drive

64: blowing fan

66: Circulating flow path

68: suction pipe

69: heater

91~95: Measured amount of laundry

110: Controller

120: Thermal pump module

121: Heat Pump Controller

122: thermal pump driver

128: Pressure sensor

129: temperature sensor

130: sensor unit

131: Door sensing unit

132: clothing sensing unit

133: temperature sensing unit

134: Humidity Sensing Unit

135: current sensing unit

140: memory

150: power unit

160: drive

161: drive controller

162: Motor

163: drive pulley

164: Transmission belt

170: Manipulator (operation unit)

175: output unit

182: filter housing

183: Lint filter

185: Pump

190: Communication unit

A: Initial driving stage

B: acceleration phase

C: Maintenance phase

D1: acceleration phase

D2: Maintenance phase

D3: Stop phase

lq1: current

lq2: current

R1: Speed (target speed)

T11: Period 11

T12: period 12 (dry operation)

T13: Period 13

θm: Angle

S310~S390: Control method steps of dryer

The embodiments will be described in detail below with reference to the accompanying drawings. The same component symbols represent the same components. FIG. 1 is a perspective view of a clothes dryer according to an embodiment of the present invention; FIG. 2 is a perspective view illustrating the interior of the clothes dryer of FIG. 1 Fig. 3 is a schematic diagram for explaining the air circulation in the clothes dryer of Fig. 1; Fig. 4 is a schematic diagram for explaining the air circulation and refrigerant circulation in the clothes dryer of Fig. 1; Fig. 5 is a diagram illustrating the basis of this A schematic diagram of the structure of a clothes dryer according to an embodiment of the invention, in which air is recovered from the drum in the flow path and foreign objects are collected; FIG. 6 is a block diagram simply illustrating the control configuration of the clothes dryer according to an embodiment of the invention Fig. 7 is a block diagram briefly explaining the control operation of the heat pump of the clothes dryer according to the present invention; Fig. 8 is a block diagram for explaining the drum and blowing fan for driving the clothes dryer according to an embodiment of the present invention A schematic diagram of the structure and operation; FIG. 9 is a schematic diagram illustrating an operation mode for sensing the amount of laundry in a clothes dryer according to an embodiment of the present invention; Fig. 10 is a schematic diagram for explaining the operation mode shown in Fig. 9; Fig. 11 is a schematic diagram for explaining a current waveform detected according to the operation mode shown in Fig. 9; Fig. 12 is a diagram for explaining an implementation according to the present invention Example of a schematic diagram of laundry movement according to the rotation speed of the dryer; Figure 13 is a schematic diagram for explaining the movement of laundry in the drum according to the operating mode shown in Figure 9; Figure 14 is a schematic diagram for explaining the basis of an embodiment of the present invention A graph of the characteristics sensed by the amount of laundry in the dryer; FIGS. 15 to 17 are graphs illustrating the results of sensing the amount of laundry in the dryer according to an embodiment of the present invention; and FIG. 18 is an illustration A flowchart of a method for controlling a clothes dryer according to an embodiment of the present invention.

The advantages and features of the present invention and the method of realizing them will be clearly understood from the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and can be implemented in various different forms, and the embodiments are provided only to fully disclose the present invention and fully convey the scope of the present invention to those having ordinary knowledge in the technical field. The controller and any other components included in the present invention may be realized by more than one microprocessor, and may be realized by a hardware device.

1 is a perspective view of a clothes dryer according to an embodiment of the present invention; FIG. 2 is a perspective view illustrating the inside of the clothes dryer of FIG. 1; and FIG. 3 is a schematic diagram illustrating air circulation in the clothes dryer of FIG. 1.

The clothes dryer 1 of the present invention is configured as shown in Figs. 1, 2 and 3.

The clothes dryer 1 according to the present invention includes: a cabinet 10; a drum 30 arranged in the cabinet and rotating with the laundry loaded therein; a driver 60 for rotating the drum 30; heat pump modules 50, 52, 53, 54 and 58, for heating the air circulating in the drum 30, thereby heating the laundry; blowing fan 64 for circulating the air in the drum 30; heater 69 for heating the air introduced into the drum 30; and circulation The flow path 66 is used to guide airflow.

The cabinet 10 defines the exterior of the clothes dryer, and provides a space to arrange the drum 30 and any other components therein. The cabinet 10 is formed into an entire rectangular shape.

The door 20 is provided on the front surface of the cabinet 10, and the door 20 rotates left and right to open and close the inside of the cabinet 10.

The casing 10 includes a front cover 11, a top plate 16, side covers 12 and 13, a rear cover 15 and a base 14.

An entrance (not shown in the figure) is formed in the front cover 11, and the door 20 is used to open and close the entrance. The inlet is communicated with the drum 30.

The door 20 may be rotatably coupled to the front cover 11 and includes a door glass 22. The door glass 22 is formed of a transparent member to allow a user to see the inside of the drum 30 and has a shape protruding toward the inside of the drum 30.

The control panel 17 may be provided above the front cover 11. The control panel 17 includes: a display (for example: LCD, LED panel, etc.) for displaying information about the operating status of the dryer; an operating unit (for example: buttons, dial, touch screen, etc.) for receiving information from the user Instructions for operating the dryer; and a speaker (not shown in the figure) for outputting guidance, effect sounds or warning sounds about the operating state.

In order to maximize the capacity of the drum 30, the drum 30 is disposed inside the cabinet 10, and the blowing fan 64 and the heat pump module are disposed under the drum 30.

The drum 30 is formed in a cylindrical shape, and its front and rear surfaces are open, wherein the front surface communicates with the inlet. In addition, an air inlet (not shown in the figure) is formed on the rear surface of the drum 30 to introduce air, and the air inlet is connected to a circulation flow path for circulating air.

The lifter 31 is installed in the inside of the drum 30, and the lifter 31 lifts the laundry in the drum while rotating, and then allows the laundry to fall freely. The roller is supported by a supporter (not shown in the figure) arranged in the casing.

The driver 60 includes a motor fixed to the base 14 of the cabinet 10. The motor provides power for rotating the drum, and is also connected to the blowing fan 64, thereby rotating the blowing fan. The motor is a motor with two shafts, and the drum 30 and the blowing fan 64 are respectively connected to the two shafts.

The motor includes a transmission pulley 163 connected to the shaft of the drum, and the transmission pulley 163 meshes with a transmission belt 164 surrounding the drum 30. The drum 30 may be rotated forward or backward through the rotation of the motor. An idler pulley (not shown in the figure) can be installed to adjust the tension of the drive belt. The drive belt can surround the circumferential surface of the drum while meshing with the drive pulley and the idler. When the motor rotates, the transmission belt is transmitted by the driving pulley, and the drum 30 rotates by the friction force acting between the drum and the transmission belt.

The blowing fan 64 can be rotated by the motor of the driver 60. Through the rotation of the blowing fan 64, the air in the drum 30 is introduced into the suction pipe 68. The suction pipe 68 may be included in the circulating flow path 66.

When the blowing fan 64 rotates, the air discharged from the drum 30 is guided to the suction duct 68 and supplied to the blowing fan 64. The suction pipe 68 is coupled to the front surface of the front supporter and communicates with the air inlet of the blowing fan 64. The blowing fan 64 circulates the air in a manner that the air sucked from the drum passes through the heat pump module through the circulation flow path 66 and then flows back to the drum.

When the drum 30 rotates forward, air flows from the rear of the drum to the inside of the drum, and the air is discharged to the front of the drum. In addition, when the drum rotates backward, air may flow from the front of the drum and be discharged to the rear of the drum.

According to an embodiment, the circulating flow path 66 may be configured in various ways. The circulation flow path 66 guides the air discharged from the blowing fan to the heat pump module, and also guides the air discharged from the heat pump module to the drum via the heater. The circulating flow path 66 may even be provided at the rear of the drum to allow heated air to flow into the drum 30.

The circulating flow path along which the air in the drum circulates can be formed in various ways. The circulating flow path 66 may be connected to the drum, thereby forming a closed circuit for air circulation. In addition, the circulating flow path may be connected to a discharge pipe (not shown in the figure) through which air is discharged, and a suction pipe (not shown in the figure) through which outdoor air is introduced.

The filter assembly 19 is installed at the inlet to collect lint contained in the air discharged from the drum 30 and then flowing to the suction pipe.

The heat pump module drives the refrigerant in the heat pump cycle to circulate the refrigerant.

The laundry loaded in the drum can be dried by the heated air supplied to the drum. During the drying operation, the air discharged from the drum flows into the circulation flow path along with the moisture contained in the evaporation from the laundry, and the discharged air is heated by the heat pump module and then is supplied back to the drum.

The heat pump module includes a compressor 50, a condenser 52, an evaporator 53, and an expansion valve.

The heat pump module is configured so that the compressor 50, the condenser 52, and the evaporator 53 are connected to each other via a refrigerant pipe. Therefore, the air heated through the refrigerant and the heat exchange between the air in the condenser and the evaporator passes through the refrigerant The circulation is supplied to the drum. In some cases, the heat pump module can realize heat exchange with a medium other than the refrigerant.

The evaporator 53 can recover the energy of the discharged air by performing heat exchange between the air flowing through the blowing fan 64 from the drum 30 and the refrigerant. In addition, the evaporator 53 condenses the moisture contained in the introduced air.

The condenser 52 generates heat exchange between the air passing through the evaporator 53 and the refrigerant, and discharges the heated air to the drum. The low-temperature and low-humidity air passing through the evaporator is introduced into the condenser and exchanges heat with the refrigerant, and then is supplied to the drum in a high-temperature and low-humidity state.

The refrigerant discharged from the condenser passes through the evaporator and is then collected again in the compressor. The compressor 50 compresses the evaporated refrigerant and discharges the compressed refrigerant to the condenser, and the expansion valve expands the refrigerant condensed in the condenser 52.

The compressor 52 and the evaporator 53 are heat exchangers.

Since the hot and humid air discharged from the drum 30 is hotter than the refrigerant of the evaporator 53, the air exchanges heat with the refrigerant while passing through the evaporator, thereby condensing and cooling. Therefore, the hot and humid air is dehumidified and cooled by the evaporator. The condensed water generated in the process of condensing air can be collected in a condensed water shell (not shown in the figure) and discharged.

In addition, the heat pump module may further include an auxiliary heat exchanger 54 and a cooling fan 58. The auxiliary heat exchanger 54 may be configured by a detachable condensing module that can be detached from the condenser 52. The auxiliary heat exchanger and the cooling fan can be configured as a module or can be detached from each other.

The auxiliary heat exchanger 54 may be installed in the refrigerant pipe and cool the refrigerant discharged from the condenser, wherein the refrigerant pipe extends from the condenser to the expansion valve with reference to the flow direction of the refrigerant.

The cooling fan delivers external or internal air of the cabinet to the auxiliary heat exchanger, thereby cooling the auxiliary heat exchanger.

Fig. 4 is a schematic diagram for explaining air circulation and refrigerant circulation in the clothes dryer of Fig. 1. As shown in FIG. 4, the air supplied to the drum 30 heats the laundry, absorbs moisture evaporated from the laundry, and then discharges the moisture.

The air circulates through the blowing fan 64.

The air flows through the blowing fan to the evaporator 53 through the drum, is condensed in the evaporator, and then flows to the condenser 52 in a low temperature and low humidity state. Due to the heat exchange with the refrigerant of the condenser 52, the air is heated and then flows back to the drum 30. The air can be additionally heated by a heater installed on the circulation flow path.

One of the heat pump module and the heater 69 may be selectively operated, or both may be operated simultaneously.

The air flows in the order of the flow cylinder 30, the evaporator 53, and the condenser 52.

The compressor 50 discharges the refrigerant to the condenser 52 in a high-temperature and high-pressure state, exchanges heat with the air in the condenser, and then flows to the evaporator 53 to be evaporated. The expansion valve 59 is installed between the condenser and the evaporator. The expansion valve expands the low-temperature and high-pressure refrigerant and delivers the expanded refrigerant to the evaporator. The expanded refrigerant evaporates in the evaporator 53, flows to the compressor 50 in a low temperature and low pressure state, and is then discharged to the condenser in a high temperature and high pressure state.

Fig. 5 is a schematic diagram illustrating the structure of a clothes dryer according to an embodiment of the present invention, in which air is recovered from a drum in a flow path and foreign matter is collected.

As shown in Fig. 5, the filter assembly 19 is installed in the entrance facing the drum, especially the front part of the drum, which is the connection between the front panel and the drum. The air discharged from the drum passes through the filter assembly 19 and flows to the evaporator along the circulating flow path through the blowing fan.

In the process of flowing from the drum 30 to the evaporator 53 through the blowing fan 64, the air passing through the drum may be separated from the laundry while passing through the filter assembly 19 of the drum, thereby removing lint contained in the air.

The filter assembly 19 may include a filter housing 182 fixed to the front support; and a lint filter 183 detachable from the filter housing 182. The filter housing 182 forms an accommodation space in which the lint filter 183 is accommodated, and a filter insertion hole is formed in the top surface of the accommodation space so that the lint filter 183 can be inserted into the accommodation space. The lint filter 183 may be inserted into the accommodation space via the filter insertion hole, or may be drawn out from the accommodation space.

The front surface of the drum contains electrodes 18 of a laundry sensing unit, which is used to sense the state of the laundry in the drum. The clothing sensing unit is composed of two electrode sensors. The two electrode sensors are installed in a predetermined space separated from each other, and include a cathode and an anode, and are exposed toward the drum.

When the electrode sensor touches the laundry while the laundry moves through the rotation of the drum, the electrode sensor senses the state of the laundry, especially the amount of moisture contained in the laundry. The controller (not shown in the figure) determines the dry state of the clothes based on the amount of moisture contained in the clothes sensed by the electrode sensor.

When the clothing is in contact with the electrode sensor, the closed circuit formed as two poles is conducted by the moisture contained in the clothing, and when the current value flowing in the circuit changes, the degree of dryness of the clothing can be determined according to the current value. The clothing acts as the resistance of the electrode, and the resistance value changes according to the amount of moisture contained in the clothing, and therefore, the current flowing in the circuit also changes.

The controller not only obtains the degree of drying, but also controls various electronic components of the dryer 1. The controller may include a central processing unit (CPU); and a memory for storing data in a format readable by the CPU. The controller can be one processor or multiple processors.

Fig. 6 is a block diagram briefly illustrating the control configuration of a clothes dryer according to an embodiment of the present invention. As shown in FIG. 6, the clothes dryer 1 is configured as described above, and, in order to control the operation, the clothes dryer 1 includes: an operator 170, an output unit 175, a communication unit 190, a driver 160, a power unit 150, and a heat pump The module 120, the pump 185, the heater 69, the sensor unit 130, the memory 140, and the controller 110 for controlling the overall operation of the clothes dryer.

The manipulator 170 includes an input device, such as at least one button, switch, or touch pad installed on the control panel 17. The operator 170 inputs operation settings including power input, operation mode, and clothing type setting. When a kind of clothing is selected and the power key is input, the operator 170 may input data about operation settings to the controller.

The output unit 175 includes: a display for displaying information about the operation settings input by the operator 170 and for outputting the operating state of the dryer; and a speaker or buzzer for outputting voice guidance, specific sound effects or warnings sound. The display may include a menu screen for operation setting and operation control of the dryer, and output a guide message or warning composed of at least one or a combination of text, value, and image regarding operation setting or operation status.

The memory 140 may store control data for operation control of the dryer, input operation setting data, data on the operation mode, and reference data for determining the error of the dryer. In addition, the memory 140 stores data sensed or measured during the operation of the dryer, and data sent and received through the communication unit. The memory 140 may be a hardware storage device, such as ROM, RAM, EPROM, flash drive, and hard drive.

The communication unit 190 transmits and receives data in a wired or wireless manner. The communication unit 190 may be connected to a network formed in a building or at a predetermined distance, such as a home network, to send and receive data; may be connected to an external server such as the Internet; and may have a control function Terminal equipment communication. The communication unit 190 transmits the operation status of the dryer or the progress status of the drying operation, and receives instructions regarding the dryer. The communication unit 190 includes not only short-range communication modules such as Zigbee and Bluetooth, but also communication modules such as Wi-Fi and Wibro to send and receive data.

The power unit 150 supplies operating power by converting the supplied regular power source. The power unit blocks excess current and rectifies and smoothes the supplied power, thereby providing operation power of a predetermined specification.

The sensor unit 130 includes a plurality of sensors that measure the voltage or current of the clothes dryer, sense the rotation speed of the motor, temperature, and humidity, and input the measured values to the controller 110.

The sensor unit 130 includes a door sensing unit 131, a clothes sensing unit 132, a temperature sensing unit 133, a humidity sensing unit 134, and a current sensing unit 135. The sensor unit 130 may further include: a pressure sensor for sensing the pressure of the refrigerant of the heat pump module 120; a temperature sensor; and a speed sensing unit for sensing the rotation speed of the drive motor or the roller的rpm。

The temperature sensing unit 133 can sense the internal temperature of the drum, the temperature of the refrigerant or the heat exchanger in the heat pump module 120, the temperature of the heater 69, and the internal temperature of the control circuit. In addition, the temperature sensing unit includes a plurality of sensors respectively installed at different positions to sense temperature.

The humidity sensing unit 134 senses the internal humidity of the drum and the humidity of the circulating air.

The laundry sensing unit 132 may contact the laundry contained in the drum to sense the amount of moisture contained in the laundry. The clothes sensing unit may be included in the humidity sensing unit, and may be installed separately from the humidity sensing unit.

The current sensing unit 135 may sense the current applied to the motor of the driver 160 and input the sensed current value to the controller 110.

The door sensing unit 131 may sense whether the door 20 is opened or closed. Before performing an operation according to the setting, the door sensing unit 131 senses the open/closed state of the door and inputs the sensing signal to the controller. In addition, the door sensing unit 131 senses whether the laundry is jammed.

The heater 69 heats the air supplied to the drum so that the air reaches a predetermined temperature.

The heater driver (not shown in the figure) supplies operating power to the heater 69 in order to operate the heater or stop the operation of the heater, and control the heating temperature of the heater. The heater driver may control the heater in different ways for the case where the heater 69 is operated alone and the case where the heater 69 is operated together with the thermal pump module 120.

The pump 185 is operated by a pump driver (not shown in the figure) and discharges condensed water to the outside. The pump 185 discharges the condensed water contained in the condensed water housing, which is generated by condensation of moisture recovered from the air by the drum in the evaporator.

The driver 160 controls the driving of the motor to rotate the motor. The motor is connected to the drum 30 and provides power to the drum to rotate the drum. In addition, a motor is connected to the blowing fan 64 to rotate the blowing fan.

When the drum and the blowing fan are connected to a single motor, the driver 160 simultaneously controls the drum and the blowing fan by controlling the motor. When the drum is connected to the motor via a transmission belt and pulley, each rotation of the drum and the number of rotations of the motor have a predetermined ratio. The rotation speed of the motor is different from the rotation speed of the drum. For example, a drive pulley may be installed to allow the motor to rotate 40 to 60 times while the drum rotates once. According to the connection structure with the drive shaft of the motor, the blowing fan can rotate at the same speed as the rotation speed of the motor.

The blowing fan 64 controls the air flow in the dryer. The blowing fan 64 supplies hot air to the drum 30, absorbs moisture-containing air from the drum, and causes the moisture-containing air to flow to the heat pump module 120.

The heat pump module 120 includes a compressor 50 and a heat exchanger, thereby removing moisture from the circulating air and heating the air through heat exchange with the refrigerant.

The controller 110 performs control to store the operation settings received from the operation unit 170 in the memory 140, process data transmitted and received through the communication unit 190, and output the operation settings and operation status of the dryer through the output unit 175. When an application for controlling the dryer is installed and there is a terminal device (not shown in the figure) wirelessly connected to the dryer, the controller may control the communication unit to send the dryer's data to the terminal device.

The controller 110 controls the operation of the drum and the blowing fan through the driver 160 according to the operation setting received from the operation unit 170, and variably controls the operation according to the sensing value of the sensor unit 130. The controller 110 controls the heat pump module 120 to heat the air during operation, and controls either or both of the heater and the heat pump module to operate in order to control the temperature of the air supplied to the drum.

The controller 110 controls a series of programs for drying the laundry loaded in the drum.

The controller 110 senses the amount (number) of laundry loaded in the drum, and sets a drying time according to the amount of laundry. When the motor is operating, the controller 110 stores and analyzes the current value sensed by the current sensing unit 135 to determine the state of the motor and determine the amount of laundry contained in the drum.

In the case of detecting the amount (quantity) of the laundry, if the motor rotates through the driver 160, the controller 110 applies a control command to increase the rotation speed of the motor to a preset rotation speed, maintain the preset rotation speed for a predetermined period, and then Stop spinning. The controller 110 determines the amount of laundry by analyzing the current value sensed by the current sensing unit 135 during the acceleration phase and the maintenance phase. In the acceleration phase, the motor reaches a preset speed, and during the maintenance phase, the preset speed stay the same.

In addition, when detecting the amount (number) of laundry, the controller 110 may control the driver 160 to make the drum repeatedly perform the operation of rotating in one direction, rotating in the opposite direction, and then rotating in one direction.

While sensing the amount (quantity) of the laundry, the controller 110 controls the thermal pump module 120 to stop the operation, and when the amount of laundry is sensed, the controller 110 can control the thermal pump module to perform according to the setting operating.

The controller 110 sets the rotation speed of the motor so that the drum rotates at a predetermined rotation speed. The controller sets the rotating speed of the drum so that the laundry in the drum falls while moving with the drum through the rotation of the drum. When the drum is rotated by the motor, the blowing fan 64 rotates with the rotation of the drum 30, thereby allowing air to flow through the circulating flow path.

During the drying operation, the controller 110 may determine whether the laundry is properly dried based on the data sensed and received by the plurality of sensors in the sensor unit 130. According to the drying state of the laundry sensed by the laundry sensing unit, the controller 110 changes the drying time or the rotation speed of the drum. In addition, when an error occurs during the drying operation, the controller 110 may perform control to output the error through the output unit 175, and stop the operation of the dryer according to the error that occurs.

Fig. 7 is a block diagram simply explaining the control operation of the heat pump of the clothes dryer according to the present invention.

As shown in FIG. 7, the thermal pump module 120 may further include: a thermal pump controller 121, a thermal pump driver 122, a compressor 50, a valve 59, a cooling fan 58, a pressure sensor 128, and a temperature sensor 129, the condenser 52, and the evaporator 53. In addition, the thermal pump module 120 further includes an auxiliary heat exchanger.

The heat pump controller 121 controls the compressor 50 to operate according to a control instruction from the controller 110. The heat pump controller 121 sets the operating frequency of the compressor, variably controls the compressor based on the data sensed by the pressure sensor 128 and the temperature sensor 129, and controls the rotation speed of the cooling fan 58.

The heat pump driver 122 controls the driving of the compressor 50, the valve 59, and the cooling fan 58. The heat pump driver 122 can be classified into a compressor driver, a valve driver, and a fan driver that are separately provided.

The heat pump driver 122 supplies operating power so that the compressor 50 operates according to the setting of the heat pump controller 121. The thermal pump driver 122 may include a frequency converter (not shown in the figure). The heat pump driver 122 controls the opening and closing of the valve 59, and the valve 59 controls the flow of the refrigerant. For example, heat pump drive The radiator 122 controls the four-way valve to change the flow path of the refrigerant, and controls the opening and closing of the valve 59 for the refrigerant discharged from the condenser, so that the refrigerant expands and evaporates in the evaporator 53.

The heat pump driver 122 supplies operating power to the fan motor, so that the cooling fan 58 rotates. When the fan motor is driven, the cooling fan 58 rotates at a predetermined rotation speed. The cooling fan 58 may be provided in the auxiliary heat exchanger 54. The auxiliary heat exchanger 54 is configured by a separate condensing module that can be separated from the condenser 52, and is installed in a refrigerant pipe connected from the condenser to the expansion valve with reference to the flow direction of the refrigerant to cool the refrigerant discharged from the condenser Refrigerant. The cooling fan 58 delivers external or internal air of the cabinet to the auxiliary heat exchanger, thereby cooling the auxiliary heat exchanger.

The refrigerant in the condenser 52 and the evaporator 53 exchanges heat with the air circulating in the drum. No additional blowing fans are installed in the condenser and evaporator, and heat is exchanged with the air circulated by the blowing fan 64.

The refrigerant flows in the order of the compressor 50, the condenser 52, and the evaporator 53, and the air circulates in the order of the drum, the evaporator, and the condenser. The air may pass through the heater 69 before being supplied from the condenser to the drum.

The compressor 50 discharges high-temperature and high-pressure refrigerant, and the condenser 52 condenses the refrigerant and discharges the condensed refrigerant. Here, since heat is generated in the process of condensing the refrigerant through the condenser, the air passing through the condenser is heated by the heat generated by the condenser.

The refrigerant discharged from the condenser is evaporated in the evaporator through the expansion valve. Because the energy absorption reaction occurs in the evaporator, in the energy absorption reaction, the surrounding heat is absorbed during the evaporation of the refrigerant, so the air passing through the evaporator is cooled, and the moisture contained in the air is condensed, thereby producing condensed water .

When the moisture cooled in the evaporator 53 is generated as condensed water, the air is dehumidified and then supplied to the condenser. The air passing through the condenser is heated and then supplied to the drum.

Fig. 8 is a schematic diagram for explaining the structure and operation of a drum and a blowing fan for driving a clothes dryer according to an embodiment of the present invention.

As shown in (a) of FIG. 8, the driver 160 includes a drive controller 161 and a motor 162. The driving controller 161 applies operating power to the motor 162 so that the motor rotates at a preset rotation speed.

According to a control instruction from the controller 110, the drive controller 161 controls the motor to operate or stop operation, and also controls the rotation speed of the motor so that the motor operates at a preset rotation speed.

According to the control command, the drive controller 161 controls the rotation direction, rotation angle, and rotation speed of the motor 162. The drum 30 and the blowing fan 64 operate in response to the operation of the motor 162.

As shown in Figure 8(b), by wrapping the transmission belt 164 around the drum 30, and when the transmission belt 164 is moved by the rotation of the motor 162, the drum works with the transmission belt through the friction between the transmission belt and the drum. Spin.

When the blowing fan 64 is connected to the other shaft of the motor 162, the blowing fan rotates with the drum as the motor rotates.

When the motor rotates forward, the drum also rotates forward. When the motor rotates forward, the air flows from the rear of the drum to the inside of the drum through the blowing fan, and the air is sucked into the circulating flow path provided on the front surface of the drum, passes through the evaporator and the condenser, and then flows to the drum again. Thus looping.

At the same time, when the motor 162 rotates backward, the drum 30 and the blowing fan 64 also rotate backward. As the blowing fan rotates backward, air is supplied to the front surface of the drum, flows to the rear surface of the drum, and then passes through the condenser and the evaporator. When the blowing fan rotates backward, the air passing through the evaporator is supplied to the drum, and therefore, the unheated air flows to the drum.

The driving controller 161 may control the motor to rotate forward during the drying operation to rotate the drum and the blowing fan forward, while controlling the motor to rotate backward a predetermined number of times during the drying operation in order to prevent tangling of the laundry.

When the drum 30 is rotated through the transmission belt 164, and the motor rotates by suddenly accelerating its speed, slippage between the drum and the transmission belt may occur. That is, even when the motor rotates, slip between the transmission belt and the drum may occur, so the drum cannot rotate according to the rotation speed of the motor.

Therefore, the drive controller 161 controls the motor 162 so that the target speed is reached by accelerating for a predetermined period of time instead of immediately accelerating to the target speed from the beginning. The degree of acceleration of the motor speed during the acceleration phase is described as the acceleration gradient.

Due to the characteristic that the driving force of the motor is transmitted to the drum through the belt, the controller 110 sets the acceleration of the motor to reach the target rotation speed, so that the drum rotates without slippage.

9 is a schematic diagram illustrating an operation mode for sensing the amount of laundry in a clothes dryer according to an embodiment of the present invention; and FIG. 10 is a schematic diagram illustrating the operation mode shown in FIG. 9.

As shown in (a) of FIG. 9, the controller 110 controls the rotation speed of the motor to determine the amount of laundry.

The controller 110 divides the operation of the clothes dryer into a sensing step of sensing the amount of laundry, and a drying step of performing a drying operation to dry the laundry.

In the sensing step, the controller 110 repeatedly executes the operation mode to sense the amount of laundry.

The controller 110 may control the driver 60 so that the drum repeatedly performs an operation of stopping after rotating in any one direction and rotating in the opposite direction after a predetermined period of time. During the rotation of the drum, the controller 110 stores the current value of each stage measured by the current sensing unit 135, and determines the amount of laundry.

Hereinafter, based on the mentioned operation mode in which the drum 30 rotates in any one direction for a preset period of time, the operation of the drum for sensing the amount of laundry will be described.

The controller 110 senses the amount of laundry in the eleventh period T11. The sensing step can be set to the 11th period. When the amount of laundry is sensed, the controller 110 controls the driver to perform a drying operation in the drying step. This drying step may be set to the 12th period, and corresponds to a period lasting until the operation of the dryer is terminated.

During the eleventh period T11, the controller 110 senses the laundry amount five to six times.

The controller 110 controls the driver to repeatedly execute the operation mode by changing the rotation direction during the 11th period.

The controller 110 performs control to execute the operation mode only once in the 13th period T13, and sense the laundry amount only once in the 13th period. In the operation mode of the 13th period T13, the drum rotates five to six times. Regardless of the direction of the forward rotation and the backward rotation, the applied operation time and the sensing time are the same.

The operation mode consists of an acceleration phase, a maintenance phase, and a stop phase. In the acceleration phase, the speed is accelerated to the target speed, in the maintenance phase, the speed remains unchanged, and the rotation is stopped in the stop phase.

When the amount of laundry is simultaneously sensed in the execution operation mode, the rotation speed R1 may be the target rotation speed, which corresponds to the degree of the speed at which the laundry is lifted and dropped through the rotation of the drum. For example, in a case where the sensed laundry amount is measured, the rotation speed R1 of the drum may be set to 39 rpm to 63 rpm. The rotation speed of the motor corresponding to the rotation speed of the drum may be set to 2000 rpm to 3200 rpm, but may be changed according to the pulley ratio.

In addition, as shown in (b) of FIG. 9, the controller 110 may control the driver 60 so that the drum 30 repeatedly performs the operation of rotating in any one direction, stopping the rotation, and then immediately rotating in the opposite direction.

In this case, as described above, the time period required to perform the operation mode once is the same as the 13th time period, however, since the drum is immediately rotated, the time period required for sensing the amount of laundry may be shorter than the 11th time period T11 The 14th time period T11'.

The controller 110 may control the driver 160 so that the laundry amount is detected through backward rotation, forward rotation, backward rotation, forward rotation, and then backward rotation of the drum 30, and the drying operation T12 is performed while the drum maintains forward rotation. The controller 110 may perform control to perform a preset drying operation after sensing the amount of laundry. In this case, the rotation of the drum in the clockwise direction is defined as forward rotation, and the rotation of the drum in the counterclockwise direction is defined as backward rotation.

In addition, in a case where the laundry amount is sensed, if the first rotation direction is the forward direction, the controller 110 may sense the laundry amount six times. For example, the drum 30 may rotate forward, backward, forward, backward, forward, and backward, and then perform a drying operation while rotating forward. In addition, it may also be an example in which the drum 30 starts to sense the amount of laundry five times by rotating forward, temporarily stops the rotation, and then performs a drying operation while rotating forward.

The controller 110 senses the amount of laundry five to six times by repeatedly rotating backward and forward in the 11th period T11 or the 14th period T11'. In some cases, when the amount of laundry is sensed, the drying operation is performed after the drum is continuously rotated in any one direction five times, or the drum may be repeatedly rotated in any one direction twice, in the opposite direction, and again The operation of rotating in either direction. When the amount of laundry is sensed, any of various rotation directions of the drum can be set, but the controller 110 controls the driver so that the drum 30 operates according to an operation mode composed of an acceleration phase, a maintenance phase, and a stop phase.

In the case where the drum 30 rotates forward, when heated air is supplied to the drum, the drum rotates forward in the drying operation. During the drying operation, the drum may be rotated backward a predetermined number of times to prevent the laundry from tangling.

As shown in FIG. 10, when the amount of laundry is sensed, the controller 110 applies a control instruction to the driver 160 so that the drum rotates according to the operation mode.

When sensing the amount of laundry, the controller 110 may divide the operation mode into an acceleration phase D1 and a maintenance phase D2. In the acceleration phase D1, the rotation speed is increased to the target rotation speed R1, and in the maintenance phase D2, the target rotation speed remains unchanged. In addition, the controller 110 may perform control by further adding a stop phase D3 after the maintenance phase, and in the stop phase D3, the rotation speed of the drum is decelerated to stop.

The controller 110 may set the acceleration phase D1 and the maintenance phase D2 so that the length of the acceleration phase D1 is longer than the length of the maintenance phase. In addition, the controller 110 may set the length of the stop phase D3 to be shorter than the length of the sustain phase D2. In this case, the length of each phase refers to a period, and the fact that the length of the acceleration phase is longer than the length of the maintenance phase means that the period during which the rotation speed of the drum is accelerated is longer than the period during which the rotation speed remains constant.

For example, the length of the acceleration phase D1 and the length of the maintenance phase D2 can be set to a ratio of 5:3.

In addition, when the stop phase D3 is included, the length of the acceleration phase D1, the length of the maintenance phase D2, and the length of the stop phase can be set to a ratio of 5:3:2.

For example, when the 13th period required to execute the operation mode once is assumed to be 10 seconds, the acceleration phase, the maintenance phase, and the stop phase may be set to 5 seconds, 3 seconds, and 2 seconds, respectively.

The ratio of the length of this stage can be changed. However, since the belt of the transmission pulley connecting the motor and the drum may slip, it is preferable to set it to prevent the occurrence of slip.

When the transmission torque of the motor is constant, if the speed increases, the friction torque decreases, which may cause slippage. Therefore, the acceleration can be set within a range where no slippage occurs.

In order to prevent slippage, the rotation speed of the drum should not be accidentally accelerated. Therefore, the acceleration phase can be set so that the rotation speed increases with a preset acceleration gradient. Therefore, the acceleration phase is preferably set to be longer than the maintenance phase. The acceleration gradient refers to the change in acceleration.

The period of time to reach the target rotation speed in the acceleration phase may vary according to the acceleration gradient, but the controller 110 may determine the amount of laundry by calculating the current value of each phase with reference to the specified time period.

When the operation mode of acceleration, maintenance, and stop is performed on the drum 30 in the 13th period, the drum rotates five to six times. In one operation mode, the controller senses the amount of laundry using the current value sensed by the current sensing unit 135. The controller can use the sensed current value to sense the amount of laundry for each of the acceleration phase, the maintenance phase, and the stop phase, where the acceleration phase, the maintenance phase, and the stop phase all take the same time regardless of the rotation direction of the drum. Interval setting.

When the amount of laundry is sensed, the controller 110 recognizes the current value of the acceleration phase D1, the maintenance phase D2, or the stop phase D3 sensed by the current sensing unit 135 according to a preset ratio. The controller 110 performs control by changing the rotation direction of the drum to the forward direction and the backward direction, so that the drum repeatedly performs the operation mode preset times.

During the one-round operation mode, in which the drum rotates in three stages consisting of an acceleration phase, a maintenance phase, and a stop phase, the controller 110 recognizes the current lq1 and the current for each phase measured by the current sensing unit 135 Current lq2, and the identified current lq1 and current lq2 are stored and accumulated according to each stage. The controller 110 determines the amount of laundry by calculating the average value of the current value in the acceleration phase D1 and the average value of the current value in the maintenance phase D2.

The controller 110 repeatedly executes this operation mode five to six times, and senses the laundry amount in the 11th period T11 or in the 14th period T11' with an added stop period. For example, if the 13th period T13 in which the operation mode is performed once is 10 seconds and the operation mode is performed five times, the period for sensing the amount of laundry may be set to about 50 to 60 seconds.

The controller 110 calculates the average value of the current values sensed in each round of operation mode for each stage, and determines the amount of laundry based on the value obtained by subtracting the current value of the maintenance stage from the current value of the acceleration stage . The controller 110 calculates the amount of laundry as a value obtained by subtracting half of the average current value in the maintenance phase from the average current value in the acceleration phase.

In order to reduce the error caused by the laundry type and the friction between the drum and the transmission belt, the controller 110 subtracts half of the (average) current value in the maintenance phase.

The average value of the current value gathered in the acceleration phase is the average value of the current consumed from the stopped state to the target rotation speed, and is affected by the 50% current component by friction. In addition, for the average value of the current in the maintenance phase, 100% of the friction coefficient of the transmission belt 164 and the drum 30 is applied, and therefore the influence of 100% of the friction is applied.

Therefore, in order to eliminate the influence of the friction of the transmission belt 164, the controller 110 subtracts the average value of the current value of the maintenance phase from the average value of the current value of the acceleration phase, and, due to the influence of 50% friction of the acceleration phase , And 100% of the friction effect of the maintenance phase is applied, therefore, the controller 110 can determine the amount of laundry as obtained by subtracting half of the average value of the current value of the maintenance phase from the average value of the current value of the acceleration phase value.

FIG. 11 is a schematic diagram illustrating current waveforms detected according to the operation mode shown in FIG. 9.

As shown in (a) and (b) of Figure 11, different current values are measured by the motor according to the amount of laundry.

As shown in (a) of FIG. 11, when the amount of laundry is small, the measured current value is low except for the initial drive current. And, as shown in FIG. 11(b), when there is a large amount of laundry, the measured current value is higher than that in FIG. 11(a).

Therefore, the amount of laundry can be determined based on the current value used to rotate the drum containing the laundry.

The current sensing unit 135 can measure current according to the initial driving phase A, the acceleration phase B, and the maintenance phase C. In the initial driving phase, there is a large error due to the position of the laundry or the position of the motor during the initial driving. , And the large error of the current value at the initial driving time, therefore, the current value of the initial driving phase A can be excluded. If necessary, the initial driving phase can be included in the acceleration phase.

The controller 110 controls the driver to accelerate so that the rotation speed of the drum 30 is increased to reach the target rotation speed. While the drum 30 is rotating, the laundry in the drum 30 is initially in a state where the laundry is rotated and rolled (turned over) in the drum, and as the rotation speed of the drum 30 increases, the amount of movement of the laundry is increased due to the centrifugal force in the drum. When the rotation speed of the drum 30 reaches the target rotation speed, the laundry is in a state of being lifted and dropped by the rotation of the drum.

The controller 110 performs control to accelerate the rotation speed of the motor to the extent that the laundry is lifted and then dropped through the rotation of the drum, and then the rotation speed is maintained.

When the drum is rotated under the operation of the clothes dryer, various forces act on the drum in which the laundry is loaded. When the drum rotates, motor torque, inertial torque, friction torque and load torque act on the drum.

Motor torque is the force acting on the rotating motor connected to the drum; initial torque is the force caused by inertia when accelerating or decelerating during rotation to maintain the existing state of motion (rotation); friction torque is due to the friction between the drum and the laundry , The friction between the door and the laundry, between the laundry, and between the transmission belt and the drum to resist the force of rotation; and the load torque is the force of resisting the rotation due to the weight of the laundry.

While the drum is rotating, the force acting on the clothes at an angle of θm is as follows. This is the force that acts when the drum moves by the angle θm from the stopped state.

Motor torque is the force required to operate the motor, and is expressed as the sum of inertia torque, friction torque, and load torque. The motor torque is a value obtained by multiplying the force of lifting the laundry by the radius of the drum. Inertial torque is the inertia or root of the drum when the speed is accelerated or decelerated during rotation. It resists the force of rotation according to the distributed inertia of the clothes. In this case, the inertial torque is proportional to the weight of the laundry and the square of the radius of the drum. The friction torque is the friction force acting between the laundry and the drum, between the laundry and the door, and between the transmission belt and the drum. Therefore, the friction torque is proportional to the rotation speed. The friction torque can be calculated as the multiplication value between the friction coefficient and the speed. The load torque is gravity acting according to the distribution of the laundry, and can be calculated based on the weight of the laundry, the acceleration due to gravity, the radius of the drum, and the angle.

Gravity affects the force acting on the laundry at a specific angle θm, but due to the rotation of the drum, the acting force can be calculated as a value obtained by multiplying gravity by sin θm. The gravity is determined by the acceleration of gravity, the radius of the roller and the weight of the roller.

While the drum is rotating, the motor torque, inertia torque, friction torque, and load torque act simultaneously, and these force components are reflected in the current value of the motor. Therefore, the controller 110 uses the current sensing unit 135 to sense during the operation of the motor. The measured current value calculates the amount of laundry.

Due to the weight, the motor torque is considerably affected by gravity, and if the weight is equal to or greater than a predetermined weight, the resolution is reduced. That is, in the case where the amount of laundry increases to a predetermined degree or more, as the amount of laundry increases, the discrimination ability according to the weight of the laundry decreases.

The change in friction torque is increased through the friction between the clothing and the door and the clothing is jammed at the door, thus increasing the spread or dispersion of the friction torque. In particular, if the amount of laundry increases, the spread or dispersion of friction torque increases significantly.

Due to the movement of the clothes, a deviation of the load torque occurs. In addition, if the weight of the laundry is equal to or greater than the predetermined value, the movement of the laundry is reduced, and thus the load torque is reduced.

Although the inertial torque is affected by the movement of the clothes, the inertial torque has linearity in the amount (weight) of the clothes, and therefore the amount of clothes can be measured more accurately.

Since the inertial torque is a force used to resist to maintain the status quo, the inertial torque acts when accelerating or decelerating. In other words, the inertial torque acts in the acceleration and deceleration phases, but when the speed remains constant, the inertial torque does not act, and the motor torque, friction torque, and load torque are applied through gravity.

Therefore, the characteristics of the inertial torque can be calculated by excluding the data in the maintenance phase from the data in the acceleration phase. Inertia can be obtained by subtracting the current value of the sustaining phase from the current value of the acceleration phase and the current value of the deceleration phase, dividing the result of the subtraction by the hourly speed change, that is, acceleration, and multiplying the result of the division by the counter electromotive force (counter electromotive force) to calculate.

Therefore, the clothes dryer can determine the amount of clothes based on the inertial torque by analyzing the forces acting in the acceleration phase and the maintenance phase, and the clothes dryer can calculate the gravity based on the amount of clothes in the maintenance phase. In the maintenance phase, the inertia properties are minimized, and the inertia greatly plays a role in the acceleration phase and the deceleration phase. Therefore, it is possible to calculate the sensing value of the laundry amount in each phase based on different data, and analyze the calculated value in a comparative way. Value to determine the final amount of laundry.

In addition, since the clothes dryer calculates the amount of laundry by measuring the current value during the rotation of the motor, the possibility of errors caused by the position distribution of the motor can be eliminated in operation, and since the laundry moves regularly, not irregularly Ground movement can minimize errors caused by changes in the load state (that is, changes in load) during the maintenance phase.

12 is a schematic diagram for explaining the movement of clothes according to the rotation speed of the dryer according to an embodiment of the present invention.

As shown in FIG. 12, when the amount of laundry 9 is sensed, the controller 110 rotates the drum 30 in a stopped state in any direction, so as to accelerate to the target speed for a predetermined period of time, maintain the target speed for a predetermined period of time, and then Stop the rollers.

Once the drum starts to rotate, when the rotation speed is low, the laundry 9 is in a state of rotating and rolling in the drum, as shown in Figure 12(a), and as the rotation speed increases, the laundry 9 is lifted by the drum, increasing the amount of the laundry 9 The amount of movement.

As shown in (b) of FIG. 12, if the rotation speed of the drum 30 increases, the laundry 9 is lifted by the centrifugal force of the drum and then falls.

In addition, as shown in (c) of FIG. 12, if the rotation speed of the drum is further increased, the laundry 9 is attached to the drum and therefore rotates with the drum 30.

As shown in (b) of FIG. 12, the controller 110 sets the target rotation speed to the extent of the speed at which the laundry 9 moves with the drum through the rotation of the drum 30 and falls from the top of the drum.

As shown in the figure, if the rotation speed of the drum is low, the amount of movement of the laundry is small, and if the rotation speed of the drum increases, the laundry rotates with the drum through centrifugal force while sticking to the drum. In order to dry the clothes, air should be allowed to pass through the clothes. Therefore, when the amount of clothes is sensed, the target rotation speed may be set as the rotation speed at which the clothes move together with the drum and fall due to gravity greater than centrifugal force. The target speed can be set equal to the normal speed.

The rotation speed of the drum (target rotation speed) can be set in the range of 39 rpm to 63 rpm. When measuring the amount of laundry, the drum can be rotated at 57 rpm. In this case, if the motor and the pulley are set at a ratio of 51:1, the rotation speed of the motor is 2000rpm to 3200rpm.

The controller 110 may change the rotation speed according to the amount of laundry. The controller 110 may classify the amount of laundry into multiple levels.

As the rotation speed of the motor changes, the rotation speed of the drum also changes. However, the rotation speed of the motor may be changed according to the size, diameter or circumference of the pulley of the motor connected to the drive belt of the drum and the size, diameter or circumference of the drum.

In addition, the controller 110 may change the rotation speed during the drying operation according to the sensed amount of laundry.

In the drying operation, according to the amount of laundry, the controller can perform control through the first rotation speed, which is a basic rotation speed, and when there is a large amount of laundry, the time for the laundry to fall and the drying speed may be changed due to the weight of the laundry Slower, so in this case, the rotation speed can be set to a second rotation speed higher than the first rotation speed. The second rotation speed is higher than the first rotation speed, and the second rotation speed falls into a speed range in which some laundry in the drum falls while other laundry rotates with the drum.

In addition, the controller 110 changes the rotation speed or the drying time according to the degree of dryness of the laundry measured by the laundry sensing unit 132 during the drying operation. For example, in the case that the initially sensed amount of laundry is a small load, when the drying operation is performed for a preset period of time and the degree of drying meets the preset value, the rotation speed may be changed to a value lower than the first rotation speed. The third speed. In addition, when the drying degree is less than the preset value after the drying operation is performed for a preset period of time, the rotation speed may be changed to the second rotation speed.

For example, when the amount of laundry is a few load or a small load, the controller 110 may set the motor speed to 2900 rpm to 3000 rpm, and when the amount of laundry is a medium load or a large load At large load, the controller can set the motor speed from 3000rpm to 3200rpm. In some cases, small load and medium load can be set as normal load. In addition, according to the amount of laundry, different motor speeds can be set.

In addition, during the drying operation, the controller 110 may change the rotation speed or the drying time according to the amount of laundry. In a case where the amount of laundry is a very small load, if a preset drying period has elapsed, the rotation speed is changed to 2500 rpm to 2600 rpm according to the degree of dryness sensed by the laundry sensing unit 132.

Fig. 13 is a schematic diagram for explaining the movement of laundry in the drum according to the operation mode shown in Fig. 9.

As shown in FIG. 13, while sensing the amount (number) of laundry, the drum 30 repeatedly rotates forward or backward, and the controller 110 senses the amount of laundry according to the current value sensed by the current sensing unit 135.

While driving the drum 30 to accelerate the rotation speed of the drum 30, maintaining the rotation speed unchanged, and stopping the drum, the controller 110 measures the current values in the acceleration phase and the maintenance phase, thereby sensing the amount of laundry.

In the case of performing the operation mode once by rotating forward, the laundry in the drum is in a state of rotating and rolling during a period in which the rotation speed of the drum is accelerated.

As shown in (b) and (d) of FIG. 13, as the rotation speed increases, the laundry in the drum is lifted by the drum and falls.

When the laundry is dropped, the movement of the drum may occur, but this usually occurs during a drying operation, so the controller 110 may measure the amount of laundry in a state where the laundry is dropped.

14 is a graph for explaining the characteristics sensed according to the amount of laundry in the clothes dryer according to an embodiment of the present invention.

When measuring the amount of laundry, the clothes dryer 1 repeatedly executes an operation mode consisting of increasing the rotation speed of the drum, maintaining the increased rotation speed, and then stopping the rotation for a predetermined number of times. The clothes dryer 1 divides the operation mode into an acceleration phase, a maintenance phase, and a stop phase, and then measures the current value in each period. In the acceleration phase, the drum 30 accelerates its rotation speed to a target rotation speed. According to the increase degree of the rotation speed during the acceleration phase, that is, the acceleration gradient, a deviation of the laundry measurement occurs.

As shown in FIG. 14, when it comes to measuring the amount of laundry, the controller 110 may calculate the amount of laundry by considering the linearity and resolution calculated according to the acceleration gradient related to the increase in the amount of laundry.

As shown in Fig. 14(a), as the acceleration gradient increases, the linearity increases. However, when the acceleration gradient increases, slippage between the drum 30 and the transmission belt may occur, and therefore, it is preferable to accelerate the rotation of the drum with a predetermined acceleration gradient or less.

When referring to sensing the amount of laundry, linearity refers to the degree of discrimination between calculated values according to the amount of laundry, and represents the degree of increase in the calculated value proportional to the increase in the amount of laundry. For example, linearity indicates the degree of clarity of discrimination between the measurement value obtained in response to 1 kg of clothing and the measurement value obtained in response to 2 kg of clothing.

When the linearity is equal to or greater than 0.8, the amount of laundry can be distinguished. Therefore, in order to determine the amount of laundry, it is preferable to accelerate the rotation speed of the drum with an acceleration gradient with the linearity equal to or greater than 0.8. In order to determine the amount of laundry more clearly, it is preferable to control the rotation speed of the drum with an acceleration gradient equal to or greater than 0.82.

As shown in FIG. 16 which will be described later, it is preferable to find that the difference between the calculated values is large enough to be distinguished from an increase in the amount of laundry.

If the linearity is equal to or greater than 0.8, the acceleration gradient is equal to or greater than about 300 rpm/s.

If the linearity is equal to or greater than 0.82, the acceleration gradient of the motor, or the acceleration gradient of the roller considering the pulley ratio, is equal to or greater than about 450 rpm/s (P1).

As shown in (b) of FIG. 14, as the acceleration gradient increases, the resolution changes. As shown in FIG. 16 which will be described later, the resolution refers to a deviation from a measurement value of the amount (weight) of the same laundry, and the resolution is a measurement range according to the amount of laundry. If the measurement range for the amount of the same laundry is wide, there may be overlapping parts, so it will be difficult to distinguish the amount of laundry. On the other hand, if the measurement range is narrow for the amount of the same laundry (if the deviation is small), it is easy to distinguish the amount of laundry in each part.

Therefore, when it comes to sensing the amount of laundry, the resolution is preferably equal to or less than 1.5.

If the resolution is equal to or less than 1.5, the acceleration gradient of the motor used to accelerate the rotation speed of the drum or the acceleration gradient of the drum before considering the pulley ratio is 300 rpm/s (P2) to 1700 rpm/s (P3).

Taking linearity and resolution into consideration, when determining the amount of laundry, the acceleration gradient of the motor during the acceleration phase, or the acceleration gradient of the pulley considering the previous drum, is preferably 300rpm/s (P2) to 1700rpm/ s(P3). When the linearity is 0.82 or greater, the acceleration gradient of the motor, or the acceleration gradient of the pulley considering that of the previous drum, is preferably 500 rpm/s to 1700 rpms (P3).

If the acceleration gradient increases, the linearity increases but the resolution decreases (its value increases). Therefore, the acceleration gradient of the motor or the acceleration gradient of the pulley considering the pulley is preferably set to 300rpm/s (P2) to 1700rpm /s(P3).

According to the resolution chart, it is found that the acceleration gradient of the motor, or the acceleration gradient of the drum before considering the pulley ratio, achieves good performance in the case of 500 rpm/s to 100 rpm/s and 1250 rpm/s to 1500 rpm/s. In addition, when the acceleration gradient of the motor or the acceleration gradient of the roller considering the pulley ratio is 100 rpm/s to 1250 rpm/s, the idling of the motor may cause performance degradation, but this reduction is only still linear. The degree and resolution meet the performance change within the range of the set value, therefore, this acceleration gradient is applicable. Linearity and resolution can be changed according to the connection structure between the drum and the motor and the characteristics of the motor.

15 to 17 are graphs illustrating the results of sensing the amount of laundry in the clothes dryer according to an embodiment of the present invention.

The result of calculating the amount of laundry based on the acceleration gradient is as follows. The graph shows the measured values obtained based on the same clothes with a moisture content of 66.6%.

Figure 15(a) shows the amount of laundry measured when the acceleration gradient of the motor or the acceleration gradient of the drum before considering the pulley ratio is 250rpm/s, and in Figure 15(b) Shows the amount of laundry measured under an acceleration gradient of 1750rpm/s.

As shown in Figure 15(a), because the difference between the measured values is small according to the amount of laundry, when the acceleration gradient of the motor or the acceleration gradient of the pulley is 250 rpm/s compared to the previous drum, the linearity is low ; And, because of the wide range (large deviation) of the measurement value for the same amount of laundry, the resolution is low. For example, weight measurement is redundant in the portion (92) corresponding to 1 kg to 2 kg and the portion (91) corresponding to 5 kg or more, and therefore, it is difficult to discern the amount of laundry.

As shown in Figure 15(b), when the acceleration gradient is 1750 rpm/s, good linearity is achieved with respect to a small amount of clothing, but the linearity and resolution are in the part corresponding to 3 kg or more (93) Medium is low.

Figure 16(a) shows the amount of laundry (94) measured under an acceleration gradient of 500 rpm/s, and Figure 16(b) shows the measured amount of clothing under an acceleration gradient of 750 rpm/s The amount of clothes (95). Figure 17(a) shows the amount of laundry measured under an acceleration gradient of 1000 rpm/s, and Figure 17(b) shows the amount of laundry measured under an acceleration gradient of 1250 rpm/s. Moreover, the amount of laundry measured under an acceleration gradient of 1500 rpm/s is shown in FIG. 17(c).

As shown in Fig. 16 (a) and (b) and Fig. 17 (a) to (c), when the acceleration gradient of the motor, or the acceleration gradient of the pulley before considering the pulley ratio, is 500rpm/s, 750rpm/s , 1000rpms, 1250rpm/s and 1500rpm/s, the linearity and resolution therefore meet the respective set ranges.

For example, when the acceleration gradient is 750 rpm/s, because there is a sufficient difference between the measured values according to the amount of laundry, the linearity is very good, and because the measurement range relative to the amount of the same laundry is narrow, the resolution is very good.

Therefore, when measuring the amount of laundry, the controller 110 may set the acceleration gradient in the acceleration phase to fall within the range of 500 rpm/s to 1500 rpm/s. In particular, the controller 110 can control the acceleration phase under an acceleration gradient of 750 rpm/s.

Fig. 18 is a flowchart illustrating a method of controlling a clothes dryer according to an embodiment of the present invention.

As shown in FIG. 18, the clothes dryer 1 is operated such that laundry is loaded into the drum 30 and the mode is set by the operator 170 according to the drying operation (S310). For example, set the mode according to the type of clothing, especially the material of the clothing, such as silk, cotton, etc.

The controller 110 senses the amount (quantity) of laundry by controlling the driver 160 (S320). The driver 160 rotates the drum according to the control instruction, and once the drum rotates according to the mode, the current sensing unit 135 measures the current value of the motor.

The controller 110 may store the current value sensed by the current sensing unit for each of the acceleration phase and the maintenance phase based on each number of times, that is, based on each round of the pattern.

The controller 110 sets the drying time according to the amount (number) of laundry (S330). The set drying time is displayed on the display of the output unit 175.

The controller 110 determines the amount of laundry as one of a plurality of levels, and sets a preset drying time according to the determined amount of laundry.

The driver 160 performs a drying operation so that the motor is driven according to a control instruction from the controller, thereby rotating the drum and operating the blowing fan (S340).

During the drying operation, the drum repeatedly lifts the laundry and drops the laundry. During the rotation of the drum, the air circulated by the blowing fan 64 is heated by the condenser 52 or the heater 69 of the heat pump module 120 and then supplied to the drum, and the moisture evaporated from the laundry is contained in the air and blows through The fan flows to the evaporator via the circulating flow path. Since the refrigerant and the air with high moisture content exchange heat in the evaporator, the air is cooled down and the moisture contained in the air is condensed, thereby generating condensed water. The humidified air flows into the condenser, then is heated, and then supplied back to the drum.

The laundry sensing unit 132 provided at the lower end of the entry opening senses the dryness of the laundry in response to the current flowing when the two electrodes 18 contact the laundry, and inputs a predetermined signal to the controller (S350).

The controller determines whether the degree of drying of the laundry is equal to or greater than a predetermined value, that is, whether the amount of moisture contained in the laundry is equal to or greater than a predetermined value (S360).

When the preset drying period has passed, if the degree of drying is less than the set value, the controller 110 changes the operation setting (S370) and continues to perform the drying operation (S340). The controller 110 can extend the drying time or change the rotation speed of the drum.

When the preset period of the drying time has elapsed, if the degree of drying is equal to or greater than the set value, the controller 110 maintains the current operating state.

If the drying time has passed (S380), the controller 110 outputs a drying operation termination notification through the output unit 175 (S390). The controller 110 outputs a terminal message through the display, and outputs a notification sound through a speaker according to the termination of the drying operation. In some cases, the controller 110 may send a notification message to the connected terminal device.

Therefore, the present invention determines the amount of laundry by measuring the current during the acceleration phase and the maintenance phase during the rotation of the drum. In the acceleration phase, the rotation speed of the motor increases, and during the maintenance phase, the rotation speed of the motor remains unchanged, which can minimize The influence of friction and the use of inertia characteristics to more accurately determine the amount of laundry.

In addition, the present invention drives the motor in a manner in which the drum and the fan are combined with each other to adjust the speed of the air circulating while passing through the laundry, thereby being able to effectively dry the laundry.

Although all the components of the embodiments are described as being combined with each other to operate integrally, the present invention is not necessarily limited to the above-described embodiments. According to the embodiment, more than one component among all components can be selectively combined without departing from the spirit of the present invention.

The foregoing description is only an illustrative example of the technical concept of the present invention, and a person with ordinary knowledge in the relevant technical field can make various modifications and changes without departing from the spirit of the present invention.

The present invention claims the priority of Korean Patent Application No. 10-2017-0164469 filed on December 1, 2017 and Korean Patent Application No. 10-2018-0151379 filed on November 29, 2018. The disclosed content is through The reference is incorporated herein.

19‧‧‧Filter assembly

50‧‧‧Compressor (Heat Pump Module)

52‧‧‧Condenser (Heat Pump Module)

53‧‧‧Evaporator (Heat Pump Module)

54‧‧‧Auxiliary Heat Exchanger (Heat Pump Module)

58‧‧‧Cooling fan (heat pump module)

60‧‧‧Drive

64‧‧‧Blowing fan

68‧‧‧Suction tube

69‧‧‧Heater

Claims (20)

A clothes dryer includes: a motor connected to a drum via a transmission belt and configured to rotate the drum; a blowing fan configured to circulate air through the drum to respond to the driving of the motor; A controller configured to apply operating power to the motor to operate or stop the motor, and to control the rotation speed of the motor; a current sensing unit configured to measure the current value of the motor; and a controller configured to A control instruction is applied to the drive controller to control the motor to rotate the drum, and to sense the amount of the laundry based on the current value sensed by the current sensing unit while the drum is rotating, wherein the The controller is further configured to perform control by determining an acceleration phase in which the rotation speed of the drum increases and a maintenance phase in which the rotation speed remains unchanged when the amount of the laundry is sensed, and to perform control such that during the acceleration phase The acceleration gradient corresponding to the motor is an acceleration gradient set in the range of 500 rpm/s to 1500 rpm/s to increase the rotation speed of the drum. According to the clothes dryer of claim 1, wherein the controller is further configured to increase the rotation speed of the drum with an acceleration gradient corresponding to the acceleration gradient of the motor of 750 rpm/s during the acceleration phase. The clothes dryer according to claim 1, wherein the controller is further configured to set the length of the acceleration phase to be longer than the length of the maintenance phase, so as to prevent the rotation speed of the drum while increasing The sliding between the driving belt and the drum. The clothes dryer according to claim 1, wherein the controller is further configured to control the rotation speed of the drum at an acceleration gradient set according to a linearity and a resolution, wherein the linearity It represents the change of the measurement value according to the increase in the amount of the laundry, and the resolution represents the measurement range according to the amount of the laundry. The clothes dryer according to claim 4, wherein the controller is further configured to control the rotation speed of the drum at an acceleration gradient, and under the acceleration gradient, the resolution relative to the amount of the laundry is equal to or Less than 1.5. The clothes dryer according to claim 4, wherein the controller is further configured to control the rotation speed of the drum at an acceleration gradient, and under the acceleration gradient, the linearity relative to the amount of the laundry is equal to or Greater than 0.8. The clothes dryer according to the first item of the scope of patent application, wherein the controller is further configured to correspond to the acceleration gradient of the motor in the range of 500rpm/s to 1000rpm/s or An acceleration gradient in the range of 1250 rpm/s to 1500 rpm/s controls the rotation speed of the drum. According to the clothes dryer described in claim 1, wherein the controller is further configured to rotate the drum at a rotation speed in the range of 36 rpm to 63 rpm at the end of the acceleration phase. The clothes dryer according to claim 1, wherein the controller is further configured to perform control such that the acceleration phase and the maintenance phase are repeated a predetermined number of times when the amount of the laundry is sensed. The clothes dryer according to claim 9, wherein the controller is further configured to change the rotation speed of the drum after the maintenance phase. According to the clothes dryer described in item 9 of the scope of patent application, the drum rotates five to six times while performing one operation mode once, wherein the operation mode is composed of the acceleration phase and the maintenance phase. The clothes dryer according to claim 1, wherein the controller is further configured to add a stop phase, which continues after the maintenance phase until the drum stops rotating. The clothes dryer according to claim 1, wherein the controller is further configured to act on different current values based on the friction between the drive belt and the drum in the acceleration phase and the maintenance phase, The amount of the laundry is sensed by removing the frictional component of the force acting on the drum during the rotation of the drum. The clothes dryer according to claim 1, wherein the controller is further configured to calculate the gravity acting on the clothes during the maintenance phase and the clothes during the acceleration phase The inertial force senses the amount of clothing. A method for controlling a clothes dryer includes: when laundry is loaded, rotating a drum by driving a motor; increasing the rotating speed of the drum in an acceleration phase; and maintaining the drum in a maintenance phase after the acceleration phase Calculate the amount of laundry by sensing the current value measured in the motor while the drum is rotating; and perform a drying operation based on the amount of laundry, wherein, in the acceleration phase, The acceleration gradient corresponding to the motor is an acceleration gradient set in the range of 500 rpm/s to 1500 rpm/s to increase the rotation speed of the drum. The method for controlling a clothes dryer according to the 15th patent application, wherein the increase of the rotation speed of the drum includes a resolution and a linearity of the amount of the laundry calculated based on the current values, The acceleration of the rotation speed of the drum is controlled in the acceleration phase in which the rotation speed of the drum increases. According to the method for controlling a clothes dryer described in claim 16, wherein the increase of the rotation speed of the drum includes controlling the rotation speed of the drum with an acceleration gradient, the acceleration gradient being equal to or less than 1.5 relative to the amount of the laundry. The resolution and the linearity equal to or greater than 0.8 are calculated. According to the method for controlling a clothes dryer according to claim 15, wherein the increase in the rotation speed of the drum includes setting the acceleration phase to be longer than the maintenance phase, so that the increase in the rotation speed of the drum is used for the maintenance The rotation speed of the stage prevents slippage between the drive belt and the drum. According to the method for controlling a clothes dryer described in item 15 of the scope of patent application, the increase of the rotation speed of the drum includes increasing the rotation speed of the drum with an acceleration gradient corresponding to the acceleration gradient of the motor of 750 rpm/s. The method for controlling a clothes dryer according to item 15 of the scope of patent application further includes: After the maintenance phase, the rotation direction of the drum is changed; and the acceleration phase and the maintenance phase are repeated a preset number of times.

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