JP2011033214A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of properly controlling an operation of a driving motor by adequately grasping a state of an automatic cleaning mechanism. <P>SOLUTION: In this air conditioner including the automatic cleaning mechanism for cleaning a filter, a driving stepping motor for operating the automatic cleaning mechanism, an electric current detecting circuit for detecting change of electric current flowing in the stepping motor at a constant frequency, and a control means for operating the stepping motor, the stepping motor is stopped or reversely operated when the number of times when an electric current value detected by the electric current detecting circuit is less than a first reference value and more than a second reference value determined in the control means within a prescribed time, reaches a prescribed number of times or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner equipped with an automatic filter cleaning mechanism, and more particularly to detection of abnormality in the automatic filter cleaning mechanism.

  An air conditioner performs air conditioning by sucking indoor air through a filter, circulating it through a heat exchanger, and blowing it out into the room. At this time, if dust accumulates in the filter, the efficiency of circulation decreases, leading to performance degradation and increased power consumption. Therefore, an automatic cleaning mechanism that automatically cleans the filter is installed, and the filter is cleaned at an appropriate time. It has been proposed to perform the automatic operation, and various devices have been devised for control when an abnormality occurs in the filter cleaning mechanism.

  Patent Document 1 includes a filter frame, a movable suction nozzle, a drive motor that moves the suction nozzle, and a suction exhaust device, and by disposing overrun detection means at both ends of the movement range of the suction nozzle, The suction nozzle can be stored at the end of the filter that does not affect the air blowing performance, and the entire surface of the filter can be automatically suctioned and cleaned without increasing the size of the mounted air conditioner, making maintenance extremely easy. It describes a filter device for an air conditioner and a control method for the filter device, which eliminates the troublesome periodic cleaning of the filter, always ensures a good ventilation state, and increases safety and reliability.

  In Patent Document 2, the suction nozzle for cleaning dust on the filter is moved to the left side, and the filter is cleaned by moving the suction nozzle from the non-detection of the right end position detection means until the signal is detected within a set time. Thus, a control device for an air conditioner that can control the suction nozzle for sucking dust with one suction nozzle detection means and can realize automatic filter cleaning is described.

  Patent Document 3 is provided with left and right suction nozzle detection means, and when the left and right suction nozzle detection means detect simultaneously, it detects that there is a problem with at least one detection means and detects it with the right (left) suction nozzle detection means. It moves from left to right (right) and has a malfunction notification means that detects the malfunction of the suction nozzle by the time it takes for the left (right) suction nozzle detection means to detect the malfunction. Therefore, a control device for an air conditioner that automatically detects a failure and reports it to the user without continuing the filter cleaning in a state where the filter cleaning device is defective is described.

  Patent Document 4 recognizes that there is a problem with the suction / exhaust device when the rotation speed of the suction / exhaust device is equal to or lower than the rotation number set in advance by the filter cleaning control means, and has a failure notification means for notifying the failure. A control device for an air conditioner that automatically recognizes a failure and reports it to a user without continuing filter cleaning in a state where the suction / exhaust device of the filter cleaning device is defective is described.

JP 2006-026541 A JP 2008-1222028 A JP 2006-132936 A JP 2006-132861 A

  In the conventional automatic cleaning mechanism of the filter, the current is detected by using a bipolar stepping motor as the motor that drives the automatic cleaning mechanism, and compared with the reference value provided in the control means, the rotational speed of the driving motor And torque is controlled. Further, when a normal operation cannot be performed, such as when a mechanical lock state occurs, the automatic cleaning mechanism is prevented from being damaged by stopping the driving motor.

  As described above, even in the conventional control, if the automatic cleaning mechanism is completely locked, it is possible to detect an abnormality by detecting the current and stop the driving motor. However, an unstable load state, for example, a state in which the automatic cleaning mechanism is caught by the filter and continues to move without stopping while the filter is bent, and the load variation is small may occur.

  In such a case, the increase in current is small, and it has been difficult to identify whether or not an abnormality has occurred in the automatic cleaning mechanism by simply detecting the current as in the prior art. In this case, it is possible to detect the abnormality of the automatic cleaning mechanism by lowering the reference value setting, but the difference from the current value during normal operation is small, exceeding the reference value despite normal operation. There is a possibility of erroneous detection that the operation is stopped, and improvement is desired.

  In Patent Document 1, a state in which the movable part is caught by the filter frame and the drive motor is stopped or the rotational speed is equal to or less than a predetermined value is determined by the magnitude of the current flowing through the drive motor, There is a suggestion that a self-diagnosis is detected by detecting that the motor load has become abnormally large, but there is no specific reference such as a method for determining the current detection result.

  In Patent Documents 2 and 3, since a failure cannot be detected unless a set time has elapsed since the start of the movement of the suction nozzle, the movable part is caught by the filter frame during the movement of the suction nozzle, and the drive motor is stopped. From the occurrence of this problem, it takes time to detect the problem, which may result in damage to the filter cleaning device, which is insufficient as a protective function for the filter cleaning device.

  In Patent Document 4, only an abnormality in the number of rotations of the suction / exhaust device is detected, and the problem that the movable motor is caught by the filter frame and the drive motor is stopped during the movement of the suction nozzle is caused by damage to the filter cleaning device. However, since this does not affect the rotational speed of the suction / exhaust device, an abnormality of the movable part of the suction nozzle cannot be detected by the present invention.

  The object of the present invention is to detect the abnormality of the automatic cleaning mechanism more reliably even in a situation where the load fluctuation of the driving motor at the time of abnormality is small and the difference from the motor current at the time of normal operation is small. Is to appropriately control the operation of the filter, prevent damage to the automatic filter cleaning mechanism, and improve reliability.

  The problem to be solved by the present invention is to provide an air conditioner that appropriately grasps the state of the automatic cleaning mechanism and appropriately controls the operation of the drive motor.

  In order to solve the above problems, an air conditioner according to the present invention includes an automatic cleaning mechanism that cleans a filter, a driving stepping motor that operates the automatic cleaning mechanism, and a constant change in the current that flows through the stepping motor. A current detection circuit for detecting at a cycle; and a control means for operating the stepping motor, and the detected current value detected by the current detection circuit is less than a first reference value and greater than or equal to a second reference value. When the number of times reaches a predetermined number or more, the stepping motor is stopped or reversely operated.

  The air conditioner according to claim 2 is the air conditioner according to claim 1, wherein when the detected current value reaches or exceeds the first reference value, the detected current value reaches or exceeds the first reference value. Regardless of the number of times, the stepping motor is stopped or reversely operated.

  The air conditioner according to claim 3 is the air conditioner according to claim 1, wherein the operation section of the automatic cleaning mechanism is divided into a plurality of sections, and the first reference value and the second reference value are defined in each section. It is.

  The air conditioner according to a fourth aspect is the air conditioner according to the third aspect, wherein the first reference value in one section is different from the first reference value in another section.

  The air conditioner according to claim 5 is the air conditioner according to claim 3, wherein the second reference value in one section is different from the second reference value in another section.

  According to the first aspect of the present invention, the state of the automatic cleaning mechanism is appropriately grasped, and the operation of the drive motor is appropriately controlled.

  According to claim 2, when a large torque fluctuation that does not occur during normal operation of the automatic cleaning mechanism occurs, the abnormality of the automatic cleaning mechanism is grasped without delay, and damage to the automatic cleaning mechanism is prevented.

  According to the third aspect, the abnormal state of the stepping motor can be quickly grasped to prevent the automatic cleaning mechanism from being damaged.

  According to the fourth aspect, regardless of the operation state of the automatic cleaning mechanism, the locked state is quickly grasped to prevent the automatic cleaning mechanism from being damaged.

  According to the fifth aspect, regardless of the operation state of the automatic cleaning mechanism, the abnormal state can be quickly grasped to prevent the automatic cleaning mechanism from being damaged.

The block diagram of an air conditioner. Sectional drawing of the indoor unit of an air conditioner. The perspective view of the automatic cleaning mechanism built in the indoor unit. Detailed drawing of sweeping operation of collected dust of automatic cleaning mechanism. The block diagram of the electric current detection circuit of the motor for automatic cleaning mechanism drive. The current waveform figure of the pseudo sine wave system of a drive motor. The current waveform figure at the time of normal operation of a drive motor. The current waveform figure at the time of heavy load operation | movement of a drive motor. The current waveform figure at the time of medium load operation of a drive motor. Control flowchart main part 1 of the automatic cleaning mechanism. Control flow chart main part 2. Control flowchart main part 3.

  Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings indicate the same or equivalent.

  First, the whole structure of an air conditioner is demonstrated using FIG. 1, FIG. FIG. 1 is a configuration diagram of an air conditioner according to an embodiment. FIG. 2 is a sectional view of the indoor unit of the air conditioner.

  The air conditioner 1 connects the indoor unit 2 and the outdoor unit 6 with a connection pipe 8 to air-condition the room. In the indoor unit 2, an indoor heat exchanger 33 is placed in the central portion of the housing base 21, and a cross-flow fan type indoor fan having a length substantially equal to the width of the indoor heat exchanger 33 is disposed downstream of the indoor heat exchanger 33. 311 is disposed, a dew tray 35 and the like are attached, these are covered with a decorative frame 23, and a front panel 25 is attached to the front surface of the decorative frame 23.

  The decorative frame 23 is provided with an air inlet 27 for sucking in indoor air and an air outlet 29 for blowing air with adjusted temperature and humidity. When the indoor blower fan 311 rotates, the indoor air flows from the air suction port 27 through the indoor heat exchanger 33 and the indoor blower fan 311 to the blowout air passage 290 having a width substantially equal to the length of the indoor blower fan 311. The left and right wind direction plates 295 arranged in the middle of the path 290 deflect the left and right directions of the air current, and the up and down air direction plates 291 arranged at the outlet 29 deflect the air current in the up and down directions and blow out into the room.

  Basic internal structures such as an indoor fan 311, a filter 231, an indoor heat exchanger 33, a dew tray 35, an up / down air direction plate 291 and a left / right air direction plate 295 are attached to the housing base 21. Such an internal structure is included in a housing 20 including a housing base 21, a decorative frame 23, and a front panel 25, and constitutes the indoor unit 2.

  In addition, a display device 397 for displaying an operation status and a light receiving unit 396 for receiving an infrared operation signal from a separate remote controller 5 are disposed on the lower side of the front panel 25.

  An air outlet 29 formed on the lower surface of the decorative frame 23 is disposed adjacent to the divided portion with the front panel 25 and communicates with the rear outlet air passage 290. The up-and-down wind direction plate 291 is provided over the entire width of the air blowing port 29, and in the closed state, the up-and-down air direction plate 291 is substantially concealed, and the outer wind direction surface which is the outer surface is slid to be a curved surface having a large curvature. Match the outline.

  By doing in this way, the up-and-down wind direction board 291 can form the outer shape from the front surface to the bottom surface of the air conditioner continuously and smoothly on the wind direction surface as the outer surface. The vertical wind direction plate 291 has a rotation angle provided at both ends and a required angle when the air conditioner 1 is operated by a vertical wind direction plate drive motor (not shown) according to an instruction from the remote controller 5. It rotates to open the air blowing port 29, and the blowing air is deflected to the lower blowing or the horizontal blowing and held in that state.

  When the operation of the air conditioner 1 is stopped, the up / down wind direction plate 291 is controlled to close the air outlet 29. For this reason, when the air conditioner is not used, the appearance of the air conditioner 1 has a soft and calm shape without unnecessary irregularities, and does not disturb the indoor atmosphere.

  The left and right wind direction plates 295 are rotated according to an instruction from the remote controller 5 by a drive motor (not shown) with a rotation shaft provided at the lower end as a fulcrum, and are held in that state. As a result, the blown air is blown out in the left and right desired directions. By instructing from the remote controller 5, the up and down wind direction plate 291 and the left and right wind direction plate 295 can be periodically oscillated during the operation of the air conditioner 1, and the blown air can be periodically sent over a wide range in the room.

  The indoor unit 2 includes a control board in an internal electrical component box, and a microcomputer is provided on the control board. The microcomputer receives signals from various sensors such as an indoor temperature sensor and an indoor humidity sensor, and receives an operation signal from the remote controller 5 via the light receiving unit 396. Based on these signals, the microcomputer controls the indoor blower fan 311, the up / down wind direction plate drive motor, the left / right wind direction plate drive motor, etc., and controls the communication with the outdoor unit 6, and controls the indoor unit 2 as a whole. To do.

  The filter 231 is for removing dust contained in the sucked indoor air, and is disposed so as to cover the suction side of the indoor heat exchanger 33. The dew tray 35 is disposed below the lower ends of the front and rear sides of the indoor heat exchanger 33, and is provided to receive condensed water generated in the indoor heat exchanger 33 during cooling operation or dehumidifying operation. The condensed water received and collected is discharged to the outside through the drain pipe 37.

  When the air conditioner 1 is in a cooling operation, the up-and-down air direction plate 291 is used in a posture that is substantially parallel to the upper wall 290a and the lower wall 290b of the blowout air passage 290 or in a horizontal direction. Also, when the blown cold air directly hits the occupant and causes discomfort, the direction of the up-and-down air direction plate 291 and the left and right air direction plate 295 is appropriately changed with the remote controller 5 to comfortably surround the occupant. Keep at a good temperature and humidity.

  When the air conditioner 1 is operated for heating, the up-and-down wind direction plate 291 is used in a posture that is almost vertical. Thereby, the warm air flowing through the blowing air passage 290 blows downward from the air conditioner 1, reaches near the floor, warms the feet, and makes the room a comfortable environment.

  Next, an automatic filter cleaning mechanism provided in the embodiment will be described with reference to FIGS. FIG. 3 is a perspective view of an automatic cleaning mechanism built in the indoor unit. FIG. 4 is a detailed view of the operation of sweeping dust collected by the automatic cleaning mechanism.

  A suction portion 230 disposed substantially horizontally is formed on the upstream side of the indoor heat exchanger 33, and a planar filter 231 is provided in the suction portion 230. The filter 231 is engaged with the guide frame 234, a propulsion shaft 243 extending in the left-right direction is provided on the front side of the guide frame 234, and rails extending in the same direction as the propulsion shaft 243 are disposed in front of and behind the guide frame 234.

  The propeller shaft 243 is coupled with a brush support frame 262 mounted with a cleaning brush 267 that slides in contact with the filter 231 and sweeps up dust 236. Move left and right along.

  When cleaning the filter 231, the driving shaft 243 is rotated by the drive motor 242, the brush support frame 262 is moved, and the entire surface of the filter 231 is swept by the cleaning brush 267 attached to the brush support frame 262.

  This operation will be described in detail. The brush support frame 262 moves from the position F in FIG. 4 which is the standby position to the left in FIG. 4 as symbols D, C and B, and the dust 236 on the filter 231 is swept away by the cleaning brush 267.

  At this time, the air conditioner 1 operates the blower fan 311 at ultra-low speed rotation to reduce the wind pressure applied to the dust on the filter 231 so that the dust can be easily swept away. For this reason, the dust on the filter 231 is easily swept away by the cleaning brush 267 using soft hair. When the dust on the filter 231 is swept away, the dust that has not been swept away by the cleaning brush 267 due to the dust away from the filter 231 tries to scatter around the cleaning brush 267, but the blower fan 311 is very slow. Since it is rotating, there is almost no dust that is collected again on the filter 231 and scattered around by the slight airflow generated by the blower fan 311 rotating at an ultra-low speed.

  Since the cleaning brush 267 uses soft hair, the force for deforming the filter 231 is small, and dust on the filter 231 can be swept away without supporting the filter 231 from the back side. For this reason, it is only necessary to sweep the filter 231 from one side, and the drive mechanism of the cleaning brush 267 only needs to be provided on one side of the filter 231, so that the drive mechanism is greatly simplified.

  At this time, the start of the cleaning operation is determined based on the predetermined filter cleaning operation conditions, for example, the cumulative operation time of the cross-flow fan 311 exceeds 30 hours from the previous cleaning execution, and the operation of the cross-flow fan 311 in the immediately preceding operation. If the condition such as is 10 minutes or longer is satisfied, the cleaning operation is started.

  By controlling in this way, the filter 231 is always kept in a state where there is little dust, so that it is possible to prevent a decrease in performance of the heat exchanger 33 due to contamination of the filter 231.

  The brush support frame 262 that has swept away the dust on the filter 231 and reached the position of symbol B in FIG. 4 further moved to the left, slidably contacted with the filter 231 and swept by the cleaning brush 267. 236 is rubbed against the dust removal brush surface 271a, and the dust 236 swept by the cleaning brush 267 is transferred to the dust removal brush 271.

  The brush support frame 262 that has transferred the dust 236 to the dust removal brush 271 reverses the moving direction at the position of the symbol A that is the end of the movement, and returns toward the symbol F that is the standby position.

  Although detailed description is omitted, the dust transferred to the dust collecting brush surface 271a is collected in the lower dust collecting container 281 as the cleaning brush 267 is reciprocated, and is discarded by an appropriate method.

Next, a driving method of the driving motor of the automatic cleaning mechanism will be described with reference to FIGS.
FIG. 5 is a configuration diagram of a current detection circuit of the motor for driving the automatic cleaning mechanism. FIG. 6 is a current waveform diagram of the pseudo sine wave system of the drive motor.

  In the embodiment, a bipolar stepping motor is adopted as the driving motor 242. The driving method is to subdivide one pulse into a plurality of sections as shown in FIG. 6 and adjust the current value flowing in each section. Then, a current waveform close to a sine wave is formed in a pseudo manner. By driving the drive motor with a pseudo-sine current waveform in this way, the drive torque generated by the drive motor becomes substantially constant, the automatic cleaning mechanism can be driven smoothly, Therefore, the noise when driving the automatic cleaning mechanism can be reduced. As shown in FIG. 5, the control for operating the driving motor with the pseudo sine wave current is performed by a microcomputer 105 provided in the electrical component box, a current detection resistor 108, and a current detection circuit 106 including a comparator 107. This is possible by indirectly measuring the current flowing through the drive motor 242 of the automatic cleaning mechanism 240 and outputting a drive signal from the microcomputer 105 to the drive motor 242 according to the measurement result.

  With this configuration, the drive motor 242 of the automatic cleaning mechanism 240 is driven, and the potential difference between both ends of the current detection resistor 108 that changes according to the current flowing through the drive motor 242 is connected via the comparator 107 to the microcomputer 105. By reading into the A / D port, the current flowing through the current detection resistor 108 is grasped, and the drive motor 242 is operated with a pseudo sine wave current, and this current changes according to the current flowing through the drive motor 242. Therefore, the state of the drive motor 242 can be identified by the current value detected by the current detection circuit 106.

  Strictly speaking, the current detection circuit 106 in FIG. 5 is a voltage detection circuit, but the potential difference between both ends of the current detection resistor 108 is read into the microcomputer, and this potential difference is divided by the resistance value of the current detection resistor 108 in the microcomputer. Since a current value can be easily obtained, there is no problem even if this circuit is called a current detection circuit and a potential difference read into the microcomputer is called a current value. Hereinafter, for simplicity of explanation, this voltage detection circuit is called a current detection circuit, and a potential difference read into the microcomputer is called a detection current value.

  When the drive motor 242 is stopped, the value of the current flowing through the drive motor 242 is 0A. When automatic cleaning by the automatic cleaning mechanism 240 is started, the driving motor 242 starts to rotate in response to a command from the microcomputer 105, and the brush support frame 262 starts to move. When the filter 231 does not collect much dust, the load is light and a substantially constant current flows through the drive motor 242.

  However, when the air conditioner 1 performs a cooling / heating operation, the indoor air circulates through the filter 231, and thus dust in the indoor air is filtered out by the filter 231 and gradually accumulated. As the dust accumulates, the resistance when the cleaning brush 267 moves in sliding contact with the surface of the filter 231 increases, and the required torque of the drive motor 242 required to move the brush support frame 262 also increases. As the required torque of the drive motor 242 increases, the load angle of the drive motor 242 increases and the current value also increases. Thus, even when the automatic cleaning mechanism 240 is operating normally, the current flowing through the drive motor 242 is not constant and varies with a small width.

  In addition to the accumulation of dust on the filter 231, factors that cause the current flowing through the drive motor 242 to fluctuate are, for example, when the automatic cleaning mechanism 240 is mechanically constrained for some reason, or when the brush support frame 262 is It is conceivable that the filter 231 is caught and moved while the filter 231 is deformed. The present invention monitors the current flowing through the drive motor 242 for abnormalities in the automatic cleaning mechanism 240, quickly detects this, and properly controls the automatic cleaning mechanism 240, thereby causing damage associated with abnormal operation. This prevents the automatic cleaning mechanism 240 from occurring.

  Hereinafter, the control of the embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a current waveform diagram during normal operation of the drive motor. FIG. 8 is a current waveform diagram during heavy load operation of the drive motor. FIG. 9 is a current waveform diagram during the middle load operation of the drive motor. FIG. 10 is a main part 1 of a control flowchart of the automatic cleaning mechanism. FIG. 11 is a main part 2 of the control flowchart. FIG. 12 shows the main part 3 of the control flowchart.

  The automatic cleaning mechanism 240 of the filter 231 built in the air conditioner 1 is operated at an appropriate time according to the accumulated operation time of the indoor fan 311, dust accumulation on the filter 231, or the like, or a user instruction from the remote controller 5. In response to this, cleaning of the filter 231 is started. As shown in the control flowchart of FIG. 10, first, the drive motor 242 is started to operate the automatic cleaning mechanism 240. Simultaneously with the start of the drive motor 242, the current is monitored and the microcomputer 105 is always operated by comparing the first reference value and the second reference value of the current held in the microcomputer 105.

  At this time, the state of the drive motor 242 is divided into three according to the relationship between the detected current value detected by the current detection circuit 106 that changes according to the current flowing through the drive motor 242 and the two reference values. . These three sections are shown in FIGS. FIG. 7 shows a state during a normal operation, and FIG. 8 shows a state in which the load is large with the state being mechanically completely locked. FIG. 9 shows a state where the load is increased to a medium level but is not locked. For example, the brush support frame 262 is caught by the filter 231 but is moving while the filter 231 is bent.

  In the case of FIG. 7, since the detected current value is less than the second reference value, the operation continues normally. In the case of FIG. 8, the detected current value greatly increases, and since the value is equal to or greater than the first reference value, the operation is stopped. In the case of FIG. 9, the detected current value increases from the normal time and becomes equal to or greater than the second reference value, but does not increase greatly and is smaller than the first reference value. In this case, the number of times exceeds a predetermined number of times within a predetermined time. The operation is stopped when the second reference value is exceeded.

When starting the cleaning, various numerical values are initially set in step S1 of FIG. 10, and the process proceeds to step S5 so that the pseudo-sine wave current of FIG. 6 is passed through the winding of the driving motor 242 which is a bipolar stepping motor. A voltage is applied to, and the drive motor 242 is operated.
At this time, the load angle and the current value change according to the change in the load applied to the drive motor 242, and the detected current value also changes accordingly.

  The present invention detects the change in the detected current value, stops the abnormal operation of the automatic cleaning mechanism 240, and prevents damage to the equipment.

  However, the load change occurs even when the automatic cleaning mechanism is operating normally. That is, the load fluctuates as shown in FIG. 7 due to dust accumulation on the filter 231 and small unevenness of the filter 231. However, since the load does not hinder normal operation while the fluctuation is small, this is called a light load in this specification. A load that stops the movement of the brush support frame 262 is called a heavy load, and the movement of the brush support frame 262 between the light load and the heavy load does not stop. Called medium load. 7 corresponds to a light load, FIG. 8 corresponds to a heavy load, and FIG. 9 corresponds to a medium load.

  This changing detected current value A is detected in step S6, and in step S7, this detected current value A is a second reference value A2 (slightly exceeding the maximum value of the detected current value that appears at the time of light load during normal operation). In the case of the embodiment, when the detected current value A is less than the second reference value A2, the driving motor 242 is set to 110% of the normal detected current value). Proceed to mark A. If the detected current value A is equal to or greater than the second reference value A2, the process proceeds to circle B because it is not normal.

  If the drive motor 242 is operating normally, the process proceeds from the circle A in FIG. 11 to step S21, and the position of the brush support frame 262 is checked again. In this state, since the brush support frame 262 is moving and its position is neither the right end nor the left end, the process proceeds directly to the circle D, assuming that it is located between the left and right ends. If it is the right end, the process proceeds to step S31, and if it is the left end, the process proceeds to step S22.

  Returning to step S5 of FIG. 10 from the circle D, a pulse is subsequently applied to the drive motor 242 and the brush support frame 262 moves toward the left end while sweeping the dust 236 on the filter 231 with the cleaning brush 267. . This is repeated until the brush support frame 262 reaches the left end, and the filter 231 is thoroughly cleaned.

  As a method for detecting the left end position, there is a method for providing a limit switch for detecting that the brush support frame 262 has come to the left end, an elapsed time after starting movement from the standby position on the right end, and an application to the drive motor 242. There is a method of detecting the number of pulses and the fact that the brush support frame 262 has collided with the stopper at the left end from the lock current of the drive motor 242 and determining these in combination.

  When the brush support frame 262 reaches the left end, the process proceeds from step S21 in FIG. 11 to step S22, the pulse application to the drive motor 242 stops, the drive motor 242 stops, and the process proceeds to step S23 to drive the drive motor 242. The number of locks RK is checked. In the normal operation, since the lock of the driving motor 242 has not been detected so far from the start of cleaning, RK = 0 and the process proceeds to step S25. In step S25, the drive motor 242 is stopped for a predetermined stop time, and the process proceeds to step S26 where the moving direction of the brush support frame 262 is switched to the right, and the process proceeds from the circle D to step S5 in FIG.

  In step S5, a pulse that moves in the reverse direction is applied to the drive motor 242, and the brush support frame 262 moves toward the standby position at the right end. As long as the detected current value A detected in step S6 does not exceed the second reference value A2 during the movement, steps S7, circle A, step S21, circle D, steps S5, S6, and S7 are repeated until normal. The operation continues, and the brush support frame 262 eventually reaches the standby position at the right end.

  When the brush support frame 262 reaches the standby position at the right end, the process proceeds from step S21 to step S31, the pulse application to the drive motor 242 is stopped, the drive motor 242 stops, and the process proceeds to step S32. In step S32, the number of locks RK is checked again, and in the case of normal operation, since the lock of the drive motor 242 has not been detected since the start of cleaning, RK = 0 and cleaning is normally completed.

  When the operation starts normally but a heavy load is applied during the movement of the brush support frame 262 and the drive motor 242 is locked and stopped, the current detection resistor 108 has the second reference value A2 as shown in FIG. And the electric current more than 1st reference value A1 flows. As a result, the process proceeds from step S7 in FIG. 10 to step S41 in FIG. 12 via a circle B, and the detected current value A is more than the detected current value at the time of a heavy load that stops the movement of the brush support frame 262. Compared with the first reference value A1, which is smaller but larger than the second reference value described above.

  If the detected current value A is greater than or equal to the first reference value A1, it is determined that the operation is abnormal, and the process proceeds to step S42, 1 is added to the number of locks RK of the drive motor 242, and the process proceeds to step S43. In step S43, application of pulses to the drive motor 242 is stopped, the drive motor 242 is stopped, and the process proceeds to step S44, where the number of locks RK of the drive motor 242 is checked. In this case, since the number of locks RK = 1, the process proceeds from step S44 to step S45, the moving direction of the brush support frame 262 is reversed, the process proceeds to step S46, and the drive motor 242 is stopped for a predetermined time. The process proceeds to step S21 in FIG.

  Thus, from the state where the movement of the brush support frame 262 in the moving direction is mechanically locked, the drive motor 242 is reversed to release the lock, and the brush support frame 262 is moved to the left end or the right end as it is. It is also important to evacuate so as not to obstruct air conditioning operation.

In step S21 in FIG. 11, the position of the brush support frame 262 is in the intermediate position as described above, so the process proceeds directly to the circle D and proceeds to step S5 in FIG. 10 to resume the operation of the drive motor 242 and the brush support frame. 262 is moved in the opposite direction. .... State (1)
Unless the detected current value A detected in step S6 is equal to or greater than the second reference value A2 during the movement after resuming the reverse operation of the drive motor 242, step S7, circle A, step S21, circle The operation of repeating D, steps S5, S6, and S7 continues, and the brush support frame 262 eventually reaches the left end or the right end. .... State (2)
When the reaching position of the brush support frame 262 is at the left end, the process proceeds from step S21 in FIG. 11 to step S22 and step S23, and since the number of locks RK = 1, the process proceeds from step S23 to step S28. In step S28, an abnormality is displayed to inform the user that an abnormality has occurred in the automatic cleaning device 240, and the operation of the automatic cleaning mechanism 240 ends in an abnormal state. Further, in the state (2), when the reaching position of the brush support frame 262 is the right end, the process similarly proceeds from step S21 in FIG. 11 to step S31, step S32, and step S28 to display an abnormality, and Operation ends with an abnormal condition. As described above, when the lock phenomenon occurs, the automatic cleaning device 240 is informed that an abnormality has occurred and is notified to the user, and the brush support frame 262 is retracted to the left end or the right end and does not hinder the cooling and heating operation. End automatic cleaning at the position.

  In addition, after resuming the reverse operation of the drive motor 242 in the state (1), the detected current value A becomes equal to or greater than the second reference value A2 in step S7 during the movement, and the detected current value A is further increased in step S41. If the value is equal to or greater than the first reference value A1, 1 is further added to the lock count RK in step S42 to set the lock count RK = 2. After step S42, the process proceeds to step S43 and step S44. Since the number of locks RK = 2 in step S44, the process proceeds from step S44 to step S47. In step S47, an abnormality is displayed, and the operation of the automatic cleaning mechanism 240 ends in an abnormal state.

  In this way, if a further lock phenomenon occurs during reverse rotation due to the lock, stop immediately and do not evacuate to the left and right ends, avoiding further abnormalities associated with evacuation. In addition, the automatic cleaning mechanism 240 is prevented from being damaged.

  As in this case, in the case of an abnormal end, the position at the end of the brush support frame 262 may be other than the standby position at the right end. In this case, as a matter of course, when the air conditioner 1 is restarted after the abnormal state is resolved by repair or adjustment, the brush support frame 262 is temporarily returned to the rightmost standby position, although not described in detail. Avoid getting in the way of driving.

  In the example, the first reference value A1 was set to 115% of the detected current value detected during the normal operation detected by the current detection circuit 106, and good protection performance could be obtained.

  Next, an abnormality detection method of the automatic cleaning mechanism in the case where an intermediate load is applied while the brush support frame 262 is moving will be described with reference to FIG.

  In this case, the current detection resistor 108 is smaller than the first reference value A1 as shown in FIG. 9, but the second reference value A2 (in the case of the embodiment, the detected current value during normal operation detected by the current detection circuit 106). Larger current) than 110%. Accordingly, the process proceeds from step S7 in FIG. 10 to step S41 in FIG. 12 via a circle B, and the detected current value A is compared with the first reference value A1.

  In this case, since the detected current value A is smaller than the first reference value A1, the process proceeds to step S51, and the second reference value A2 over time is accumulated. At this time, the accumulated oldest data (C1 data in the case of the embodiment) is discarded, and the second oldest data (C2 data in the case of the embodiment) is carried down to the oldest data. In the following order, the latest data (C5 data in the case of the embodiment) is decremented to the second newest data (C4 data in the case of the embodiment), and the current time is read into the latest data (C5 data in the case of the embodiment). In this way, the most recent (5 in the embodiment) second reference value A2 over time is always accumulated.

  When the second reference value A2 over time is accumulated in step S51, the process proceeds to step S52, and 1 is added to the medium load count CK. Next, the process proceeds to step S53, where the number of medium loads CK is checked. If the number of medium loads CK is less than the predetermined number (5 in the embodiment), the process proceeds to step S21 in FIG. Thereafter, the automatic cleaning mechanism 240 is controlled in the same manner as described above, and automatic cleaning proceeds, and the brush support frame 262 moves in accordance with the repetition of steps S21, circle D, steps S5, S6, S7, circles A, and S21. Go.

  In the middle of this, when an intermediate load is applied again to the brush support frame 262, a current that is smaller than the first reference value and larger than the second reference value flows through the current detection resistor 108, and proceeds from step S7 to steps S41 and S51. . In step S51, the accumulated data at the second reference value A2 overtime is updated to the latest five data, and the process proceeds to step S52, 1 is added to the number of medium loads CK, and the process proceeds to step S53. In step S53, the number of medium loads CK is checked. If the number of medium loads CK is 5 or more, the process proceeds to step S54. In step S54, if the oldest A2 over time to the latest A2 over time is within a predetermined time (10 seconds in the embodiment), it is determined that there is an abnormality equivalent to one lock in the automatic cleaning device 240 and the process proceeds to step S42. In step S42, 1 is added to the number of locks RK, and the process proceeds in the same manner as described above, and automatic cleaning ends abnormally.

  By doing so, the current value of the drive motor 242 that the filter 231 is bent and the brush support frame 262 continues to move while the filter 231 is caught by the automatic cleaning mechanism 240 is much different from the normal value. Even when the detected current value is smaller than the first reference value and greater than the second reference value, the number of medium loads CK is greater than or equal to the predetermined number of times within a predetermined time, and is regarded as being equivalent to a lock and recognized as an abnormal state. Since the driving motor 242 can be controlled, damage to the automatic cleaning mechanism 240 can be prevented.

  In the embodiment, the first reference value and the second reference value when the cleaning brush 267 slides on the filter 231 and sweeps dust are described. However, the present invention is not limited to this. Set a plurality of sets of the first reference value and the second reference value, and when the cleaning brush 267 gets over the dust removal mechanism 270, when the brush support frame 262 hits the left end stopper, or starts from the standby position. By setting the first reference value and the second reference value and controlling the automatic cleaning mechanism 240 for each scene where the load fluctuates greatly even during normal operation, such as the time, a small driving torque during normal operation for each scene By driving the automatic cleaning mechanism 240, noise during automatic cleaning can be suppressed to the minimum noise.

  As described above, the air conditioner according to the embodiment detects an automatic cleaning mechanism that cleans the filter, a driving stepping motor that operates the automatic cleaning mechanism, and a change in the current flowing through the stepping motor at regular intervals. A current detection circuit; and a control means for operating the stepping motor, wherein a detected current value detected by the current detection circuit is less than a first reference value provided in the control means and greater than or equal to a second reference value When the number of times within a predetermined time reaches a predetermined number or more, the stepping motor is stopped or reversely operated.

  In general, home air conditioners incorporate various mechanisms for the purpose of air purification, comfort, and operability in addition to air conditioning functions. As a drive motor, it is easy to grasp the position during driving. In addition, stepping motors are often used because of the simplicity of drive control that can be controlled in an open loop.

  The automatic cleaning mechanism that cleans the filter does not leak in this example, and a stepping motor is used. However, since the driving range extends over the entire filter surface, the driving mechanism also becomes larger and mechanical loss of the driving mechanism increases. In order to overcome this and ensure the reliability of operation, the output of the stepping motor must be increased.

  Further, the torque output of the stepping motor increases as the load angle increases, and when the load angle increases beyond the limit, the torque output decreases and steps out. For this reason, when an abnormal force is applied to the stepping motor due to a malfunction of the drive mechanism, etc., the stepping motor will step out, and if left unattended, the step out will be repeated, and abnormal force will be repeatedly generated inside the air conditioner, May cause damage to internal components.

  As described above, when an abnormal force is applied to the stepping motor due to a malfunction of the drive mechanism or the like, if this is detected and appropriate control is not performed promptly, damage to the components of the automatic cleaning mechanism and the electric power that drives this will occur. A malfunction of parts occurs, and the function of the air conditioner becomes partially unusable, which inconveniences the user.

  When the automatic cleaning mechanism is operating normally, the load torque applied to the stepping motor is almost constant, but the average load is affected by the movement of the cleaning brush and the frictional resistance of the sliding part of the drive force transmission mechanism. Increase / decrease within a small range from torque.

  Along with this, the current flowing through the stepping motor also increases or decreases within a small range from the average current value. The interval of increase / decrease and the duration of increase / decrease are determined according to the structure of the automatic cleaning mechanism, but the interval of increase / decrease is approximately a fraction of a fraction of the driving cycle of the automatic cleaning mechanism to a few tenths. The interval is long and the duration of the increase / decrease is a relatively short time of about a fraction of a second.

  On the other hand, when the brush of the automatic cleaning mechanism moves, for example, when the brush is caught on the filter and the filter is bent and a larger force is required to move the brush, the torque increases intermittently at short intervals. Along with this, the current flowing through the stepping motor also exceeds the average current value at short intervals, or continues to increase or decrease across the duration, and this continues until the brush catch is resolved. Is relatively long.

  According to the air conditioner of the embodiment, it is possible to distinguish between a small torque fluctuation that occurs during normal operation of such an automatic cleaning mechanism and a small torque fluctuation at the time of a confusing abnormality.

  Therefore, it is possible to provide an air conditioner that appropriately grasps the state of the automatic cleaning mechanism and appropriately controls the operation of the drive motor.

  In the embodiment, a stepping motor has been described as an example. However, the present invention is not limited to this, and the current value increases as the load increases from a normal load state even in cases other than the stepping motor. It is obvious that the present invention can be applied to any motor having characteristics.

  Moreover, the air conditioner of an Example performs a stop or reverse rotation driving | operation of the said drive motor, when the said detected electric current value is more than a 1st reference value.

  In general, the current flowing through the stepping motor also increases as the load angle increases, and when the load angle exceeds the limit, the stepping motor steps out and the flowing current decreases once. Repeat.

  According to the air conditioner of the embodiment, when the operation of the automatic cleaning mechanism is hindered by a mechanical failure, a large torque exceeding the stationary torque is applied to the stepping motor, and the stepping motor continuously steps out, The detected current value continuously shows a large current value.

  By appropriately setting the first reference value, it is determined that the operation of the automatic cleaning mechanism is hindered by a mechanical failure, and a large torque that does not occur during normal operation is applied to the stepping motor. It is possible to prevent the parts of the automatic cleaning mechanism such as the drive motor from being damaged by appropriately controlling the operation of the drive motor such as stopping the drive motor or performing reverse operation.

  For this reason, when a large torque fluctuation that does not occur during normal operation of the automatic cleaning mechanism occurs, an air conditioner that grasps the abnormality of the automatic cleaning mechanism without delay and prevents damage to the automatic cleaning mechanism in advance is provided. Can do.

  In the air conditioner of the embodiment, the operation section of the automatic cleaning mechanism is divided into a plurality of sections, and the first reference value and the second reference value are determined in each section.

  Thereby, the period of one automatic cleaning is divided into a plurality of sections such as a section where the load is mechanically heavy and a section where the load is lightened, and the first in each section depending on whether the load is heavy or light. The reference value and the second reference value are set, and the abnormality of the stepping motor is determined in two stages for each section.

  As a result, since the first reference value and the second reference value can be appropriately selected and set for each section in accordance with the weight and lightness of the load during normal operation, abnormal operation has started. Sometimes changes from normal operation can be detected quickly and appropriate control can be performed.

  For this reason, it is possible to provide an air conditioner that quickly grasps the abnormal state of the stepping motor and prevents damage to the automatic cleaning mechanism.

  In the air conditioner of the embodiment, the first reference value in one section is different from the first reference value in another section.

  As a result, the first reference value is optimized for each section according to the weight and lightness of the load in the section where the load is mechanically heavy and the section where the load is lightened in the cycle of one automatic cleaning. Therefore, when the automatic cleaning mechanism is locked, this can be detected quickly and appropriate control can be performed.

  For this reason, it is possible to provide an air conditioner that quickly grasps the locked state and prevents the automatic cleaning mechanism from being damaged regardless of the operation state of the automatic cleaning mechanism.

  In the air conditioner of the embodiment, the second reference value in one section is different from the second reference value in another section.

  As a result, the second reference value is optimal for each section in accordance with the weight and lightness of the load in the section where the load is mechanically heavy and the section where the load is lightened in the cycle of one automatic cleaning. Therefore, when abnormal operation starts, a change from normal operation can be quickly detected and appropriate control can be performed.

  For this reason, it is possible to provide an air conditioner that quickly grasps an abnormal state and prevents damage to the automatic cleaning mechanism, regardless of the operating state of the automatic cleaning mechanism.

  Further, the air conditioner of the embodiment has an automatic cleaning mechanism for cleaning the filter, a driving motor that operates the automatic cleaning mechanism, and a current detection circuit that detects a change in current flowing in the driving motor. And a control means for operating the driving motor.

  As a result, when an abnormality that prevents the operation of the automatic cleaning mechanism occurs, the current detection circuit within a predetermined time set in the control means even if the current growth of the drive motor is small and confusing with the normal operation By counting the number of times that the detected current value detected in step S becomes equal to or greater than a predetermined second reference value, the state of the stepping motor can be grasped, and fine control can be performed under more various environments.

  For this reason, it is possible to provide an air conditioner that prevents the automatic cleaning mechanism from being damaged during abnormal operation of the stepping motor.

  In addition, the air conditioner according to the embodiment has a change in the current flowing through the driving motor due to an increase / decrease in load due to dust accumulated in the filter, or an increase / decrease in load due to a mechanical lock such as the automatic cleaning mechanism or the filter being caught. Is detected by the current detection circuit.

  As a result, even when the load fluctuation of the drive motor is small and the difference from the motor current during normal operation is small, the state of the automatic cleaning mechanism can be grasped more appropriately and the stepping motor can be stopped or reversed. it can.

  For this reason, it is possible to provide an air conditioner in which the reliability of the automatic cleaning mechanism is improved by appropriately controlling the operation of the drive motor.

  In addition, the air conditioner of the embodiment outputs a change in the current flowing through the driving motor to the control unit via the current detection circuit, and compares it with a reference value provided in the control unit. The operation of the drive motor is controlled.

  As a result, when an abnormality that prevents the operation of the automatic cleaning mechanism occurs, the current detection circuit within a predetermined time set in the control means even if the current growth of the drive motor is small and confusing with the normal operation By counting the number of times that the detected current value detected in step S becomes equal to or greater than a predetermined second reference value, the state of the stepping motor can be grasped, and fine control can be performed under more various environments.

  For this reason, it is possible to provide an air conditioner in which the automatic cleaning mechanism is prevented from being damaged during abnormal operation of the stepping motor.

  In addition, the air conditioner of the embodiment can be set when the reference value provided in the control means is set to a certain current value or when the current value is input a certain number of times within a certain period. And

  Thereby, for example, when the automatic cleaning mechanism is locked due to some trouble, the reference value provided in the control means for comparing with the change in the current flowing through the driving motor is set as a certain first reference value, When the detected current value exceeds this value, the stepping motor is immediately stopped or reversed to prevent the automatic cleaning mechanism from being damaged.

  Also, for example, when the automatic cleaning mechanism is moving while being caught by the filter, a slightly larger current flows than during normal operation, but this is confusing with the current fluctuation range during normal operation.

  In preparation for such a case, the reference value provided in the control means for comparing with the change in the current flowing through the drive motor is smaller than the first reference value described above and slightly larger than the detected current value during normal operation. When the detected current value exceeds the second reference value for a certain number of times within a certain period, it is determined that the stepping motor is operating abnormally, and the stepping motor is stopped or reversed to perform automatic cleaning. Prevent damage to the mechanism.

  As described above, the reference value provided in the control means can be set to a predetermined current value or a current value input more than a certain number of times within a certain cycle, thereby allowing a predetermined value to be set. By counting the number of times the detected current value detected by the current detection circuit is equal to or greater than a predetermined second reference value within the time of, the state of the stepping motor is grasped, and fine control is performed in more diverse environments be able to.

  For this reason, it is possible to provide an air conditioner in which the automatic cleaning mechanism is prevented from being damaged during abnormal operation of the stepping motor.

  As described above, according to the air conditioner of the first aspect, the automatic cleaning mechanism for cleaning the filter, the driving stepping motor for operating the automatic cleaning mechanism, and the change in the current flowing through the stepping motor. And a control means for operating the stepping motor, and a detected current value detected by the current detection circuit is less than a first reference value provided in the control means and When the number of times within a predetermined time that is equal to or greater than the second reference value reaches the predetermined number of times, the stepping motor is stopped or reversely operated.

  As a result, it is possible to distinguish between a small torque fluctuation that occurs during normal operation of such an automatic cleaning mechanism and a small torque fluctuation at the time of a misleading abnormality.

  For this reason, it is possible to obtain an air conditioner that appropriately grasps the state of the automatic cleaning mechanism and appropriately controls the operation of the drive motor.

  According to the air conditioner of the second aspect, when the detected current value is equal to or greater than the first reference value, the driving motor is stopped or reversely operated.

  As a result, when the operation of the automatic cleaning mechanism is hindered by a mechanical failure, a large torque exceeding the stationary torque is applied to the stepping motor, the stepping motor continuously steps out, and the detected current value continues. A large current value is indicated.

  By appropriately setting the first reference value, it is determined that the operation of the automatic cleaning mechanism is hindered by a mechanical failure, and a large torque that does not occur during normal operation is applied to the stepping motor. It is possible to prevent the parts of the automatic cleaning mechanism such as the drive motor from being damaged by appropriately controlling the operation of the drive motor such as stopping the drive motor or performing reverse operation.

  For this reason, when a large torque fluctuation that does not occur during normal operation of the automatic cleaning mechanism occurs, it is possible to obtain an air conditioner that grasps the abnormality of the automatic cleaning mechanism without delay and prevents damage to the automatic cleaning mechanism in advance. it can.

  According to the air conditioner of the third aspect, the operation section of the automatic cleaning mechanism is divided into a plurality of sections, and the first reference value and the second reference value are determined in each section.

  As a result, the period of one automatic cleaning is divided into a plurality of sections such as a section where the load is mechanically heavy and a section where the load is light, and the first section is divided according to the heavy or light load. The reference value and the second reference value are set, and the abnormality of the stepping motor is determined in two stages for each section.

  As a result, since the first reference value and the second reference value can be appropriately selected and set for each section in accordance with the weight and lightness of the load during normal operation, abnormal operation has started. Sometimes changes from normal operation can be detected quickly and appropriate control can be performed.

  For this reason, it is possible to obtain an air conditioner that quickly grasps the abnormal state of the stepping motor and prevents the automatic cleaning mechanism from being damaged.

  According to the air conditioner of the fourth aspect, the first reference value in one section is different from the first reference value in another section.

  As a result, the first reference value is optimized for each section according to the weight and lightness of the load in the section where the load is mechanically heavy and the section where the load is lightened in the cycle of one automatic cleaning. Therefore, when the automatic cleaning mechanism is locked, this can be detected quickly and appropriate control can be performed.

  For this reason, it is possible to obtain an air conditioner that quickly grasps the locked state and prevents the automatic cleaning mechanism from being damaged regardless of the operation state of the automatic cleaning mechanism.

  Moreover, according to the air conditioner of Claim 5, the said 2nd reference value in one area differs from the 2nd reference value in another area.

  As a result, the second reference value is optimal for each section in accordance with the weight and lightness of the load in the section where the load is mechanically heavy and the section where the load is lightened in the cycle of one automatic cleaning. Therefore, when abnormal operation starts, a change from normal operation can be quickly detected and appropriate control can be performed.

  For this reason, it is possible to obtain an air conditioner that quickly grasps an abnormal state and prevents damage to the automatic cleaning mechanism, regardless of the operating state of the automatic cleaning mechanism.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 5 Remote control 6 Outdoor unit 8 Connection piping 20 Housing | casing 21 Housing | casing base 23 Makeup frame 25 Front panel 27 Air inlet 29 Air outlet 33 Indoor heat exchanger 35 Dew tray 37 Drain piping 105 Microcomputer 106 Current detection circuit 107 Comparator 108 Current detection resistor 230 Air suction part 231 Filter 234 Guide frame 236 Dust 240 Automatic cleaning mechanism 242 Drive motor 243 Propulsion shaft 262 Brush support frame 267 Cleaning brush 270 Dust removal mechanism 271 Dust removal brush 271a Dust Blower surface 281 Dust collecting container 290 Blowing air path 290a Blowing air path upper wall 290b Blowing air path lower wall 291 Vertical air direction plate 295 Left and right air direction plate 311 Blower fan 396 Light receiving unit 397 Display device

Claims (5)

An automatic cleaning mechanism for cleaning the filter, a driving stepping motor for operating the automatic cleaning mechanism, a current detection circuit for detecting a change in the current flowing through the stepping motor at a constant period, and a control for operating the stepping motor Means,
Air conditioning that stops or reversely operates the stepping motor when the number of times within a predetermined time that the detected current value detected by the current detection circuit is less than the first reference value and greater than or equal to the second reference value reaches a predetermined number or more. Machine.   2. The drive motor according to claim 1, wherein when the detected current value reaches or exceeds the first reference value, the drive motor is stopped or reversely operated regardless of the number of times the detected current value reaches or exceeds the first reference value. Air conditioner.   The air conditioner according to claim 1, wherein an operation section of the automatic cleaning mechanism is divided into a plurality of sections, and the first reference value and the second reference value are determined in each section.   The air conditioner according to claim 3, wherein the first reference value in one section is different from the first reference value in another section.   The air conditioner according to claim 3, wherein the second reference value in one section is different from the second reference value in another section.

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