JP2836338B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a fan motor of an air conditioner.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram of a conventional control device for an air conditioner, FIG. 9 is a diagram showing a method of applying a voltage to the SSR 6 of FIG. 8, and FIG. 10 is a flowchart of a subroutine for controlling the conventional fan motor. It is. In FIG. 8, reference numeral A denotes a change operation means for changing the speed adjustment (speed adjustment) of the fan motor of the air conditioner by remote control, and transmits signals such as operation / stop and change of the fan motor speed to the air conditioner. And a remote operation unit 2. B is a signal receiving means, which comprises a receiver 3 for receiving a signal from the remote controller 2. C is control means for controlling the number of revolutions of the fan motor 5, and is constituted by a microcomputer (hereinafter referred to as microcomputer) 1 and a solid state relay (hereinafter referred to as SSR) 6 for adjusting the speed of the fan motor. Reference numeral D denotes a rotation speed detecting means constituted by a rotation speed detection element (Hall element) 11 for detecting the rotation speed of the fan motor 5, especially the upper limit rotation speed. 4 is an AC power supply, 8 is a diode for full-wave rectification, and a transistor 9 is provided for taking the full-wave rectified waveform into the microcomputer 1, and 10 is a pull-up resistor of the transistor 9. 12 is a transistor and 13 is a resistor.

[0003] Hereinafter, the operation of the fan motor and the control of the number of revolutions, which are the operations of the conventional example, will be described with reference to FIGS. First, the driving of the fan motor will be described with reference to FIG. FIG. 9 shows a method of applying a voltage to the SSR for driving the fan motor. In FIG. 9, a waveform a is a waveform after full-wave rectification by the diode 8, and a rectangular wave of a waveform b is input to the microcomputer 1 by rectifying the waveform by the transistor 9. The microcomputer 1 outputs a pulse having a width X of the waveform c at a time t after the fall of the waveform b from H to L. When the pulse having the waveform c is applied to the SSR, the fan motor rotates. If there is no pulse having the width X of the waveform c, the fan motor stops.

Next, the control of the rotation speed of the fan motor in the operation of the conventional example will be described with reference to FIG. Referring to the figure, in step 10, the receiver 3 determines whether or not the operation ON signal has been received from the remote controller 2.
When the operation ON is received, the process proceeds to step 11, and it is determined whether or not the previous set fan speed and the current set fan speed are the same. If not, proceed to step 12 to determine whether the current setting fan speed is 4 (the fan motor speed is 4> 3
>2> 1 stop order, the rotation speed increases toward the left). If the fan speed is 4, go to step 13 and store 4 in the accumulator A in the ROM (read only memory) area. Step 1
If the current fan speed is not 4 in step 2, the step 1
Proceeding to 4, it is determined whether the current fan speed is 3 or not. If it is 3, 3 is stored in the accumulator A in step 15. If the current fan speed is not set to 3 in step 14, the process proceeds to step 16, where "the current fan speed is 2
Is determined, and if it is 2, 2 is stored in the accumulator A in step 17. If the current fan speed is not 2 in step 16, the process proceeds to step 18 where 1 is stored in the accumulator A. Then, step 19
Then, a flag is detected as to whether or not the rotation speed of the fan motor detected by the rotation speed detecting element (Hall element) 11, which is the rotation speed detecting means D, has exceeded an upper limit set value. Go and leave the contents of the accumulator. If the flag is 1, the process proceeds to step 21 and stores the data in the accumulator A. After that, in step 22, the contents of the accumulator A
Turn on R6. Then, the process proceeds to a step 23, wherein it is determined whether or not the rotation speed of the fan motor has exceeded a set value of the upper limit rotation speed (a value at which the wall or the like vibrates when the rotation speed exceeds the rotation speed). The upper limit rotational speed over flag is set to 1. If not, the “upper limit rotation speed over flag” is set to 0 in step 25. After passing through step 24, the process proceeds to step 26, in which "the N value is set in the rotation speed down timer". In this case, the timer time is a time period in which the rotation speed is reduced by one speed, and
When the timer is cancelled, control is performed to return the rotation speed to the original rotation speed. Thereafter, in step 27, the rotation speed down timer is decreased by one. as a result,
In step 28, it is determined whether or not the rotation speed down timer has become 0. If not, the "rotation speed down flag" is set to 1 in step 29. If the rotation speed down timer is 0, the "rotation speed down flag" is set to 0 in step 30.
If “the previous set fan speed and the current set fan speed are the same” in step 11, the process proceeds to step 31, and it is determined whether the “rotation speed down flag” is inverted from 1 to 0.
If it has been inverted, proceed to step 12; if not, proceed to step 19. If the received data of the remote controller 2 is OFF in Step 10, the process proceeds to Steps 32 to 35, and the power supply to the SSR 6 is set to 0 (stop).
Then, the upper limit rotation speed over flag is set to 0, the rotation speed down timer is set to 0, and the rotation speed down flag is set to 0.

FIG. 11 shows, for example, Japanese Patent Application Laid-Open No. 2-157495.
Is a schematic block diagram of an air conditioner to which another conventional method for detecting an abnormality of a fan motor of an air conditioner disclosed in Japanese Patent Application Laid-Open Publication No. H10-107, is indicated by 101.
2 is a heat exchanger temperature sensor for detecting the temperature of the indoor unit heat exchanger; 103 is an indoor fan motor; 104 is a motor drive unit for driving the indoor fan motor 103; The internal fan motor 103 includes a hall element in the interior 103 and an interface circuit for converting the number of revolutions of the fan motor converted into a pulse by the hall element into a voltage level that can be input to the indoor control device (microcomputer) 106. A pulse is generated each time is rotated, and is input to the indoor control device 106 via the interface circuit.
Reference numeral 107 denotes an AC power supply and reference numeral 108 denotes a thyristor. The AC power supply 107 and the thyristor 108 constitute a motor driving unit 104.
Thyristor 1 when the motor ON signal is output to
08 is turned on to energize the indoor fan motor 103, and the thyristor 103 is turned off when the alternating current flowing through the indoor fan motor 103 becomes zero cross. In other words, by performing the phase control for changing the output timing of the ON signal output from the indoor control device 106 during the half cycle of the AC power supply 107, the energization ratio to the indoor fan motor 103 can be changed, The number of rotations of 103 can be changed as set.

Next, the operation will be described. Thyristor 10 constituting a motor drive unit from indoor control device 106
When the ON signal is output to the gate of No. 8, the thyristor 108 is turned on and the indoor fan motor 103 is energized,
The thyristor 108 is turned off when the AC current flowing through the indoor fan motor 103 becomes zero cross. Therefore, by detecting the zero cross of the AC power supply 107 and varying the ON signal output timing to the thyristor 108 from the zero cross, the energization ratio to the indoor fan motor 103 can be changed, and the rotation speed of the indoor fan motor 103 can be varied. I can do it. Now, the indoor control device 106
Outputs an ON signal corresponding to the set frequency to the gate of the thyristor 108 to energize the indoor fan motor 103, and the number of rotations of the indoor fan motor 103
When detected at 05 and input to the indoor control device 106, the rotation speed of the indoor fan motor 103 is compared with two predetermined threshold values of the rotation speed inside the indoor control device 106, and the rotation speed is determined based on the result. By judging whether the number is normal or abnormal, the abnormality of the indoor fan motor 103 is detected. Thyristor 108 in motor drive unit 104 to obtain a target rotation speed of indoor fan motor 103
The means for detecting the abnormality of the indoor fan motor 103 by comparing the ON signal output with respect to the indoor fan motor 103 and the rotation speed of the indoor fan motor 103 inputted to the indoor control device 106 with a predetermined threshold value of the rotation speed is used. FIG. 12 shows a flowchart of the program, which is processed by a program in the control device 106. In FIG. 12, in step 201, power (voltage) corresponding to the set frequency is obtained in order to obtain the target rotation speed.
In step 202, the number of revolutions of the indoor fan motor 103 is detected by inputting a pulse generated in the hall element unit 105. Step 20
3, the detected rotational speed N is compared with a value obtained by dividing a predetermined target rotational speed n by a positive number a, and the detected rotational speed N is more positive for the target rotational speed n. If the value is larger than the value divided by the number a, it is determined that the rotation speed of the indoor fan motor 103 is normal, and the process proceeds to step 205. Conversely, if it is smaller, it is determined that the indoor fan motor 103 is abnormal and the process proceeds to step 204. And proceed. In step 204, since the indoor fan motor 103 is abnormal, the power supply to the motor is stopped. In step 205, as in step 203, the detected rotation speed N is compared with a value obtained by multiplying a predetermined target rotation speed n by a positive number b. n is a positive number b
Is smaller than the value obtained by multiplying
Is determined to be normal and returns to step 201. Conversely, if it is large, it is determined that the indoor fan motor 103 is abnormal, and the process proceeds to step 204 to stop power supply to the motor. For example, if the positive number a is 3, the positive number b is 1.2, and the target rotation speed n is now 1500 rpm,
O from the indoor control device 106 to the motor drive unit 104
It is assumed that N signals have been output. Indoor fan motor 1 detected
Assuming that the rotation speed N of the motor 03 is 1600 rpm, in step 203, the target rotation speed n / the positive number a = 150
The rotation speed N is larger than 0/3 = 500 rpm, and in step 205, the target rotation speed n · b
= 1500 ・ 1.2 = 1800rpm and rotation speed N
Is smaller than that, it is determined that the indoor fan motor 103 is normal. Also, the rotation speed N detected due to the failure of the indoor fan motor 103 is 0, or the rotation speed of the indoor fan motor 103 increases due to filter clogging due to dust in the indoor unit of the air conditioner, and the detected rotation speed N Is 1900 rpm, it is determined in steps 203 and 205 that there is an abnormality, and the power supply to the indoor fan motor 103 is stopped.

[0007]

Since the conventional air conditioner is constructed as described above, if the rotational speed detecting means becomes defective, it becomes impossible to detect the upper limit rotational speed, and it is necessary to stop the fan motor. In order to operate the air conditioner again, there is a problem that the fan motor must be replaced. Further, when the control means is defective and the fan motor cannot be operated, there is a problem that the air conditioner cannot be operated until the board on which the control means is mounted is replaced.

In addition, since the method of detecting an abnormality of a fan motor of an air conditioner disclosed in Japanese Patent Application Laid-Open No. 2-157495 is configured as described above, the indoor fan motor itself is not abnormal and, for example, a failure of a hall element. Or even if the interface circuit connecting the hall element and the indoor control device fails, the indoor fan motor is determined to be abnormal and the power supply is stopped. If the fan motor and the detection unit are independent, such as the problem of disappearing or the interface circuit connecting the hall element and the indoor control device is mounted on the indoor control board, even if the interface circuit breaks down There is a high possibility that the service will be replaced with a normal fan motor, and it is not possible to properly determine the location of the failure. Not Hodokose the exact services to, there is a problem such as that over customers to the inconvenience Naru great deal of control.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is intended to be used even when the fan motor rotation speed detecting means becomes defective or the fan motor control means becomes defective. It is another object of the present invention to provide a control device for an air conditioner that can operate a fan motor.

In addition, when an abnormality occurs in the control system of the indoor fan motor, a specific abnormality location in the control system is detected and the details of the abnormality are notified. It is an object of the present invention to obtain an abnormality detection device for an indoor fan motor of an air conditioner that can continue operating output to an indoor fan motor if the fan motor is operable, and enables air conditioning even in an abnormal condition.

[0011]

Means for Solving the Problems Claim 1 according to the present invention.
The air conditioner is provided in an air conditioner that controls the number of revolutions of a fan motor. The number of revolutions detecting means for detecting the number of revolutions of the fan motor and outputting a signal, and detecting the presence or absence of a signal from the number of revolutions detecting means. A plurality of components of an air conditioner that detects fan motor temperature, ambient air temperature of the air conditioner, and heat exchanger temperature to control the number of rotations of the fan motor. A temperature abnormal location determining means for determining an abnormal temperature location, a rotation signal abnormal location determining means, and a display means for displaying an abnormal location by a signal from the temperature abnormal location determining means.

According to a second aspect of the present invention, there is provided an air conditioner provided in an air conditioner for controlling the number of revolutions of a fan motor, the signal from a revolution number detecting means for detecting the number of revolutions of the fan motor and outputting a signal. Rotation speed signal detection means for detecting the presence or absence of, indoor temperature detection means for detecting the indoor temperature,
Heat exchanger temperature detecting means for detecting the heat exchanger temperature of the air conditioner, fan motor temperature detecting means for detecting the temperature of the fan motor, and rotation control of the fan motor of the air conditioner based on signals from each detecting means. An abnormal point determining means for determining an abnormal point of the component device to be performed, and the operation of the fan motor is continued according to the abnormal point determined by the abnormal point determining means.

An air conditioner according to a third aspect of the present invention is the air conditioner according to the fourth or fifth aspect, wherein the air conditioner according to each of the abnormal point determining means corresponding to the plurality of components is determined according to the abnormal point. It is characterized in that the operation of the fan motor is continued or stopped.

[0014]

According to the first aspect of the present invention, there is provided an air conditioner comprising:
Judgment of abnormal temperature locations of multiple components of the air conditioner,
Show it.

According to the second aspect of the present invention, an air conditioner determines an abnormal portion of the rotation control component of the fan motor, and continues the operation of the fan motor according to the abnormal portion.

In the air conditioner according to a third aspect of the present invention, the operation of the fan motor is selected to be continued or stopped in accordance with an abnormal location corresponding to a plurality of components.

[0017]

[Embodiment 1] Embodiment 1 of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 31 denotes a remote controller for changing the speed adjustment (speed adjustment) of the fan motor of the air conditioner and changing operation / stop by remote control, and 32 denotes a receiver for receiving a signal from the remote controller 31. It is. 33 is a solid state relay (hereinafter referred to as SSR) for adjusting the speed of the fan motor, and 34 is an SSR.
It is a transistor that drives SR33. 35 is a fan motor, 36 is a rotation speed detecting element (built in the fan motor) for detecting the rotation speed of the fan motor 35,
37 is a transistor and 38 is a resistor. 39 is an AC power supply, 40 is a power transformer for converting high voltage to low voltage, 41 is a diode for full-wave rectification, 42 is a transistor, and 43 is a resistor. 44 is a switch A for ignoring the detection of the rotation speed of the fan motor, and 45 is a resistor. A microcomputer (hereinafter referred to as a microcomputer) 46 is at the core of these.

The operation of the above configuration will be described. First, driving of the fan motor will be described with reference to FIG. FIG. 2 shows a method of applying a voltage to the SSR for driving the fan motor. In FIG. 2, a waveform s is a voltage waveform on the secondary side of the power transformer 40, and a waveform t is a waveform after full-wave rectification by the diode 41. The waves are input to the microcomputer 46. The microcomputer 46 sets the waveform u from H to L
Time than fall to put a _n, and outputs a pulse width b of the waveform v. When the pulse of the waveform v is applied to the SSR 33, the fan motor rotates. The fan motor stops when there is no pulse having the width b of the waveform v.

Next, the operation of the first embodiment will be described. When an operation command (the setting fan speed is F1) is transmitted from the remote controller 31 and the microcomputer 46 receives the signal data,
The microcomputer uses the SRR to rotate the fan motor 35.
33 is turned ON. The control method of the SSR 33 will be described with reference to FIG. The time a from the zero cross point of the waveform t after full-wave rectification, that is, the falling of the waveform u from H to L
_{When n} delays, a pulse of width b is output and SSR33 is turned on.
If N, the SSR 33 turns on the fan motor until it passes the zero cross of the waveform s. By repeating the above control, the fan motor 35 continues to rotate at the speed control F1. Then, the microcomputer 46 detects a rectangular wave from the rotation speed detecting element 36 in order to check whether the fan motor 35 is rotating. That is, it is determined that the fan motor 35 is rotating while the rectangular wave can be detected,
If the rectangular wave cannot be detected for the time d, the fan motor 35 is determined to be locked (defective) and the fan motor 35 is stopped.

When the rotation speed detecting element 36 of the fan motor 35 becomes defective, the switch A44 is turned ON (short) to switch the control to ignore the rotation speed detection control of the fan motor. Then, the microcomputer 46 determines the zero cross point of the waveform t after the full-wave rectification, that is, the H of the waveform u.
→ ON Then the fall than to output the pulse of the width b at that delay time a _n SSR33 to L, ON the fan motor to SSR33 passes through the zero crossing of the waveform s
I do. By repeating the above control, the fan motor 35 continues to rotate at the speed control F1. At this time, the microcomputer 46 ignores the presence or absence of the rectangular wave generated from the rotation speed detecting element of the fan motor 35.

Embodiment 2 FIG. In the above-described first embodiment, the method has been described in which the microcomputer 46 ignores the rotation speed detection and controls the fan motor by turning on (short) the switch A44 when the rotation speed detection element of the fan motor becomes defective. In the second embodiment, when the fan motor 35 control port P1 of the microcomputer 46 fails, the SSR 33 cannot be turned on, the fan motor does not rotate, and as a result, the rotation speed detecting element 36 does not generate a rectangular wave. The microcomputer 46 erroneously recognizes that the fan motor 35 has become defective, and stops the control of the SSR 33 that drives the fan motor 35.

When this happens, the switch B47 is turned on (short) as shown in FIG.
The control is switched to the control ignoring the defect of No. 5. When the switch C49 is turned ON (short), the fan motor 3
5 is controlled by the SSR 33 via the delay device 50. The delay device 50 is a device that outputs a pulse having a width b at a position delayed by a certain time c from the zero cross point of the waveform t and turns on the SSR 33 to rotate the fan motor 35. Incidentally, 48 is a resistor.

Embodiment 3 FIG. Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In FIG. 5, reference numeral 61 denotes an indoor temperature sensor for detecting an indoor temperature;
2 is an indoor heat exchanger temperature sensor for detecting the indoor heat exchanger temperature, 63 is an indoor fan motor, 65 is a hall element for detecting the number of revolutions of the indoor fan motor 63, 66 is a microcomputer, 67 is an AC power supply, and 69 is The microcomputer 6 converts the rotation number of the indoor fan motor 63 into an electric signal by converting the rotation number of the indoor fan motor 63 by the Hall element 65.
An interface circuit for converting the level to a level that can be input to the input device 6 and detecting the presence or absence of an electric signal from the Hall element 65;
Reference numeral 70 denotes an LED for notifying an abnormal part when each part constituting the indoor fan motor control system becomes abnormal;
Is an SSR for driving the indoor fan motor, the microcomputer 66 outputs an operation output to the primary side thereof to turn on the secondary side, and the indoor fan motor 63 operates. 7
An indoor fan motor temperature sensor 2 detects the temperature of the indoor fan motor 63. Note that the indoor fan motor control system is SS
R indicates ON / OFF, and refers to an indoor fan motor drive unit that drives the indoor fan motor 63, the indoor fan motor 63, the hall element 65, and the interface circuit 69.

Next, an electric signal corresponding to the number of revolutions of the indoor fan motor 63 from the hall element 65 is taken in and converted into a level that can be input to the microcomputer 66,
FIG. 4 shows an example of the interface circuit 69 for detecting the presence or absence of an electric signal from the Hall element 65. FIG.
In (a), 81 is a transistor, and 82 is a resistor. When an electric signal corresponding to the number of revolutions of the indoor fan motor 63, that is, a pulse is input from the hall element 65, when the pulse is at a high level, the transistor 81 is turned off.
N and a low level signal
Is input to the port PXX. Conversely, when the pulse from the Hall element 65 is at the low level, the transistor 81
Instead, a high-level signal is input to the port PXX of the microcomputer 66. Pulse from Hall element 65 and port PXX of microcomputer 66
The microcomputer 66 accurately inputs the number of revolutions of the indoor fan motor 66 to the microcomputer 66 merely by reversing the logic of the pulse input to the microcomputer 66. The pulse from the Hall element 65 is also input to the analog port ANXX of the microcomputer 66 via the resistor 82, and the pulse signal from the Hall element 65 is detected in two stages. Next, in FIG. 4B, reference numerals 81 and 82 denote FIG.
4A shows a transistor and a resistor, respectively, as in FIG. 4A. The operation until a pulse from the Hall element 65 is input to the port PXX of the microcomputer 66 is the same as that in FIG. Reference numeral 83 denotes an LED for displaying the presence or absence of a pulse from the Hall element 65. The pulse signal from the Hall element 65 is
The presence or absence of a pulse can be monitored by this LED at the same time as the signal is input to the port PXX of No. 6.

In FIG. 5, a microcomputer 66
From the SS corresponding to the set rotation speed of the indoor fan motor 63
When the R71 ON output is output, the secondary side of the SSR 71 is also turned on for a time corresponding to the output, and power is supplied to the indoor fan motor 63, so that the indoor fan motor 63 reaches the set rotation speed. When the indoor fan motor 63 rotates, the Hall element 65
Generates a pulse every rotation, and the interface circuit 69
Is input to the microcomputer 66 via the. Therefore, the number of pulses during a certain period is calculated by the microcomputer 6
By counting inside 6, it is possible to know how many revolutions of the indoor fan motor 63 are. Now, it is assumed that the rotation number pulse of the indoor fan motor 63 is not inputted to the port PXX of the microcomputer 66 for some reason. The reason why the rotation speed pulse is not inputted may be a failure of the interface circuit, a destruction of the Hall element, or a driving unit of the indoor fan motor 63 including the SSR 71 or the like.
There is a failure of itself. In this embodiment, the following method is used in order to find a part that has really failed from these possible factors. FIG. 4 (a)
As shown in the figure, in the interface circuit 69, the rotation speed pulse inputted from the Hall element 65 is supplied to the port PXX of the microcomputer 66 via the transistor 81 and the circuit of the microcomputer 66 without passing through the transistor 81. Two-stage detection of the circuit input to the analog port is performed. Therefore port P
When the rotation number pulse is no longer input to XX, by first looking at the change in the input to the analog port ANXX, it can be known whether there is really no rotation number pulse from the Hall element 65 or only the port PXX has no input. Here, if an input change is observed in the analog port ANXX, it can be said that a rotation speed pulse is generated, and the reason why the rotation speed pulse is not input to the port PXX is that the transistor 81 in the interface circuit 69 is defective. Recognize. Conversely, if no change in the input is seen at the analog port ANXX, it means that the rotation speed pulse has not been output from the Hall element 65. Possible reasons why the rotation speed pulse is not output from the hall element 65 are that the hall element 65 is broken, the indoor fan motor 63 is not energized due to the failure of the driving unit of the indoor fan motor 63, or the indoor fan Motor 6
For example, the indoor fan motor 63 cannot rotate due to the failure of the fan 3 itself. If the indoor fan motor 63 is rarely short-circuited or the main winding or the auxiliary winding is broken, the indoor fan motor 6
3 continues to be energized, the temperature of the indoor fan motor 63 rises above normal, so the temperature of the indoor fan motor 63 is detected by the indoor fan motor temperature sensor 72 and the relative value to the room temperature detected by the indoor temperature sensor 61 Is compared with a predetermined reference temperature, the indoor fan motor 63
It is possible to judge whether the thing itself is abnormal or not. If the detected relative value between the indoor fan motor temperature and the room temperature is larger than a predetermined reference value, that is, if the temperature rise of the indoor fan motor 63 is larger than normal, it is a failure of the indoor fan motor 63 itself. On the contrary, when it is determined that the relative value is smaller than the predetermined reference temperature, the indoor fan motor 63 is normal, and the rotation speed pulse is not output from the hall element 65 because the driving of the indoor fan motor 63 is stopped. It can be said that the cause is a failure of the unit or the Hall element 65 is broken. When the Hall element 65 is broken, no rotation number pulse is output. However, if a motor rotation output is output, the indoor fan motor 63 rotates, and the indoor fan motor temperature rises to some extent as usual. On the other hand, when the driving unit of the indoor fan motor 63 is out of order,
3 is not energized, it can be said that there is no temperature rise of the motor. Therefore, contrary to the above, by comparing the relative value between the indoor fan motor temperature and the room temperature with a predetermined reference temperature different from the above, it is determined whether the driving unit of the indoor fan motor 63 has failed or the Hall element 65 has failed. It is possible to determine whether or not a failure has occurred. That is, if the relative value is smaller than the reference temperature, it is determined that the temperature of the indoor fan motor 63 has not risen, and it can be said that the abnormal portion is the driving unit of the indoor fan motor 63, and conversely, the relative value is larger than the reference temperature and If the rise is not different from normal, it can be said that the Hall element 65 is abnormal.

The abnormal part is the driving unit of the indoor fan motor 63,
Alternatively, in the case of the indoor fan motor 63, even if the microcomputer 66 continues to output the setting, the indoor fan motor 63 cannot be operated fundamentally, or the temperature rise becomes too large to melt the structure of the air conditioner. Because of the dangers such as the
At the same time, the indoor fan motor 6
The power supply to 3 is stopped. When the abnormal part is the interface circuit 69 or the hall element 65, the operation of the indoor fan motor 63 itself can be performed normally. Therefore, the abnormality is notified by the LED 70. Is continued as it is.

It should be noted that the indoor fan motor temperature is compared with the room temperature, the calculation result is compared with a predetermined reference temperature, an abnormal portion is determined, and an abnormal display output to the LED 70 is output.
The power supply stop output to the indoor fan motor 63 and the like are processed by a program in the microcomputer 66, and a flowchart thereof is shown in FIG. In step 301, an ON output is output to the SSR 71 to operate the indoor fan motor 63, and in step 302, the rotation speed pulse of the indoor fan motor 63 is input from the hall element 65 via the interface circuit. Step 3
At 03, it is checked whether or not there is any abnormality in the rotation speed pulse. If there is no abnormality, the flow returns to step 301 to continue the operation of the indoor fan motor 63. If there is an abnormality in the input of the number of revolutions pulse without the input of the number of revolutions pulse, the process proceeds to step 304 to input the analog port ANXX, and in step 305 the input state is confirmed. Here, if no abnormality is found in the input state of the analog port ANXX, that is, if it is determined that the input level has changed, it is determined that the transistor circuit of the interface circuit 69 has failed. The abnormality display output is performed for the LED 70. In step 307, the indoor fan motor temperature detected by the indoor fan motor temperature sensor is input in consideration of an emergency. If it is determined in step 308 that the temperature is normal, the process returns to step 301 and is determined to be abnormal. If so, the process proceeds to step 319. Step 30
If it is determined in step 5 that the input of the analog port ANXX is abnormal, that is, it is determined that the rotation speed pulse has not been output from the Hall element 65, the fault location proceeds to step 309 and the timer is set. In step 310, the timer is decremented. If it is determined in step 311 that the timer is up, the process proceeds to step 312. If the timer is not up, steps 310 and 311 are repeated until the timer is up. Step 309, Step 310,
In step 311, time is taken to increase the temperature of the indoor fan motor as much as possible so that the abnormality can be easily detected when the indoor fan motor 63 is abnormal. Step 31
2. In step 313, the indoor temperature and the indoor fan motor temperature are input, respectively. In step 314, the relative value between the indoor fan motor temperature and the room temperature is calculated, and the result is compared with a predetermined reference temperature T1. Is going. Here, when it is determined that the relative value is higher than the reference temperature T1, that is, the temperature rise of the motor is determined to be larger than usual, it is determined that the indoor fan motor 63 itself is abnormal,
Proceeding to step 315, an indoor fan motor abnormality display is output to the LED 70. If it is determined in step 314 that the relative value is lower than the reference temperature T1, the process proceeds to step 316, where it is compared with the reference temperature T2.
Here, when it is determined that the relative value is smaller than the reference temperature T2, that is, the temperature of the motor hardly increases and the indoor fan motor temperature does not change from room temperature, the indoor fan motor 63 is not energized, Indoor fan motor 6
3 is determined to be abnormal, and the process proceeds to step 317 to display the indoor fan motor drive system abnormality display output to the LED 70.
Have gone against. If it is determined in step 316 that the relative value is higher than the reference temperature T2, that is, if it is determined that the motor temperature rise is normal, it is concluded that the output of the rotation speed pulse is due to the destruction of the Hall element 65. , And proceeds to step 318 to output the Hall element abnormality display output to LE.
D70. When the hall element 65 is destroyed, the operation of the indoor fan motor 63 is possible, so that the operation returns to step 301 to continue the operation of the indoor fan motor 63 in order to continue air conditioning. If the indoor fan motor is abnormal or the indoor fan motor drive system is abnormal, step 319 is performed to stop energization of the indoor fan motor 63.
Then, the ON output to the SSR 71 is stopped.

Embodiment 4 FIG. Fourth Embodiment for Finding a Really Defective Location Among Factors That Prevents the Number of Rotational Pulses of Indoor Fan Motor 63 from Being Input to Port PXX of Microcomputer 66
Is shown below. As shown in FIG. 4B, in the interface circuit 69, the rotation speed pulse input from the Hall element 65 is connected to the circuit input to the port PXX of the microcomputer 66 via the transistor 81 and the LED 83 without passing through the transistor 81. And a circuit for blinking the LED 83 when the rotation speed pulse is not input to the port PXX of the microcomputer 66.
Is blinking, it is confirmed that the rotation speed pulse is not really generated from the Hall element 65, or the rotation speed pulse is generated from the Hall element 65 but the transistor 81 in the interface circuit 69 is faulty. It is possible to know whether a rotation speed pulse is not input to the port PXX. If a rotation speed pulse is generated from the Hall element 65, LE is set when the rotation speed pulse is at the High level.
D83 is turned on, and conversely, when the rotation speed pulse is at the Low level, the LED 83 is turned off, so that the blinking can be confirmed. If no rotation speed pulse is actually generated due to a failure, LE
D83 remains unlit or lit. LE
When D83 remains off or remains on, that is, when a rotation speed pulse is not generated from the Hall element 65, diagnosis of a failure location is performed by a program in the microcomputer 66 in the same manner as in the above embodiment. FIG. 7 shows a flowchart of the program. In step 321, an ON output is output to the SSR 71 to operate the indoor fan motor 63, and in step 322, the number of revolutions of the indoor fan motor 63 is input from the hall element 65 via the interface circuit 69. At step 323, it is checked whether there is any abnormality in the rotation number pulse input. If there is no abnormality, the process returns to step 321 to continue the operation of the indoor fan motor 63. When the rotation speed pulse is not input and the rotation speed pulse is abnormal, the process proceeds to step 324 to input the indoor heat exchanger temperature TC1 detected by the indoor heat exchanger temperature sensor 62. In step 325, a timer is set. In step 326, the timer is decremented. If it is determined in step 327 that the timer is up, the process proceeds to step 328. If not, the process proceeds to step 326 until the timer is up.
Step 327 is repeated. In steps 325, 326, and 327, time is taken to raise the temperature of the indoor fan motor as much as possible to make it easier to detect the abnormality when the indoor fan motor 63 is abnormal. At step 328, the indoor fan motor temperature detected by the indoor fan motor temperature sensor 72 is input. If it is determined at step 329 that the temperature is abnormal, that is, the temperature rise of the indoor fan motor 63 is larger than normal, Since it is considered that the indoor fan motor 63 is rarely short-circuited, or the main winding or the auxiliary winding is disconnected, it is concluded that the failure of the indoor fan motor 63 itself does not generate a rotation speed pulse, Proceeding to step 332, if it is determined in step 329 that an indoor fan motor abnormality display output is output to the LED 70, no abnormality is found in the indoor fan motor temperature, the indoor fan motor 63 drive unit or the hall element 65 It is determined that a failure has occurred, and the process proceeds to step 330. Step 330
In step 324, the indoor heat exchanger temperature TC2 is input. When the ON output of the indoor fan motor 63 is continued to the SSR 71, the indoor fan motor 63
Since there is a significant difference in operation between the failure of the drive unit and the failure of the hall element 65, such as whether the indoor fan motor 63 remains stopped or rotates, if this is detected, which causes no rotation speed pulse to be generated Can be determined. As means for detecting whether or not the indoor fan motor 63 is rotating, there is a method of detecting a change in the temperature of the indoor heat exchanger. For example, when the operation mode of the air conditioner is cooling, the indoor fan motor 63 must be operating. For example, the rate of decrease in the indoor heat exchanger temperature for a certain period of time is greater than when the indoor fan motor 63 is operating, and when the air conditioner operation mode is heating, the indoor fan motor 63 operates. Otherwise, the rate of increase in the indoor heat exchanger temperature for a certain period of time becomes larger than when the indoor fan motor 63 is operating, so the indoor heat exchanger temperature when the indoor fan motor 63 is operating Using the rate of change over a certain period of time as a reference, compare the rate of change of the indoor heat exchanger temperature calculated with the detected indoor heat exchanger temperatures TC1 and TC2. Either the indoor fan motor 63 is operating, it is possible to determine whether the stop. Step 324, Step 3
In step 30, the indoor heat exchanger temperature TC
1, TC2 is input. In step 331, the degree of change in the indoor heat exchanger temperature (TCC for cooling, TCH for heating) during a certain period of time when the reference indoor fan motor 63 is operating is detected first. The difference between the indoor heat exchanger temperatures TC1 and TC2 is compared, and the difference between TC1 and TC2 is the reference temperature TCC or TC.
If it is determined to be greater than H, it is determined that the indoor fan motor 63 is not operating, and the process proceeds to step 333, where the indoor fan motor drive system abnormality display output is set to LED.
70. Conversely, in step 331, TC1 and TC
If it is determined that the difference between the two is equal to or smaller than the reference temperature TCC or TCH, it is determined that the indoor fan motor 63 is operating, and the routine proceeds to step 334, where the Hall element abnormality display output is output. Is performed on the LED 70, and the process returns to step 321 to return to the indoor fan motor 63.
Continue driving. In the case of an indoor fan motor abnormality or an indoor fan motor drive system abnormality, if the setting output is continued from the microcomputer 66 as it is, the temperature rise of the indoor fan motor 63 becomes too large, and the structure of the air conditioner may be melted. Since there is a problem that there is a problem or that the operation cannot be performed fundamentally, the abnormality is notified by the LED 70 when the abnormality is detected, and at the same time, the energization to the indoor fan motor 63 is stopped in step 335.

Embodiment 5 FIG. In the third and fourth embodiments, an SSR (solid state relay) is used as an element for driving the indoor fan motor 63.
Any element can be used as long as it can control the phase of the indoor fan motor 63, and may be a thyristor or a phototriac coupler.

Embodiment 6 FIG. In the third embodiment, the temperature rise of the indoor fan motor is compared with a predetermined reference temperature (relative value) as a relative value to the indoor temperature. However, the absolute temperature of the indoor fan motor is compared with the predetermined reference temperature (absolute value). Value) may be used to determine whether the indoor fan motor is abnormal.

Embodiment 7 FIG. In the fourth embodiment, the temperature rise of the indoor fan motor is compared with the absolute temperature of the indoor fan motor and a predetermined reference temperature (absolute value). Value) may be used to determine whether the indoor fan motor is abnormal.

[0032]

The present invention has the following effects. In the air conditioner according to the first aspect, since the portion of the fan motor rotation control device that is faulty is clearly notified, the repair time can be shortened by performing the correct repair for the fault location. In addition to this, there is an effect that proper repair costs can be achieved because repair and replacement of normal parts are not required.

In the air conditioner of the present invention, when an abnormality occurs in the fan motor rotation control device, if the abnormality is caused by a failure other than the fan motor, the control device automatically continues the operation of the fan motor. Therefore, there is an effect that the air conditioning can be continued, and there is an effect that the user does not have to operate a switch or the like as an emergency measure in the event of a failure. Further, since the determination as to whether or not to continue the operation of the fan motor in the event of a failure is made by an existing control device, there is no need to provide a special switch or the like, and the air conditioner can be made inexpensive.

In the air conditioner according to the third aspect, whether to continue or stop the operation of the fan motor is selected according to the abnormal location. This has the effect of preventing deformation of the structure due to abnormal heat generation of the fan motor due to energization and the like, and prevention of ignition and smoke of the fan motor.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control device for an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a method of applying a voltage to SSR 33 of FIG.

FIG. 3 is a configuration diagram of a control device for an air conditioner according to Embodiment 2 of the present invention.

FIG. 4 is a circuit diagram of an interface circuit for inputting a rotation speed pulse of an indoor fan motor to a microcomputer according to Embodiment 3 of the present invention.

FIG. 5 is a configuration diagram of an abnormality detection device for an indoor fan motor of an air conditioner according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart of a microcomputer internal program for detecting an abnormality of an indoor fan motor according to Embodiment 3 of the present invention.

FIG. 7 is a flowchart of a microcomputer internal program for detecting an abnormality of an indoor fan motor according to Embodiment 4 of the present invention.

FIG. 8 is an electric circuit diagram of a conventional control device for an air conditioner.

9 is a diagram showing a method of applying a voltage to SSR 6 of FIG.

FIG. 10 is a flowchart of a conventional control device for an air conditioner.

FIG. 11 is a schematic block diagram of an air conditioner to which a conventional method for detecting an abnormality of a fan motor of an air conditioner is applied.

FIG. 12 is a flowchart for explaining a conventional method for detecting an abnormality of a fan motor of an air conditioner.

[Explanation of symbols]

 Reference Signs List 31 remote controller 32 receiver 33 solid state relay (SSR) 35 fan motor 36 rotation speed detecting element 39 AC power supply 40 power transformer 41 diode 44 switch A 46 microcomputer (microcomputer) 47 switch B 49 switch C 50 delay device 61 indoor temperature sensor 62 Indoor heat exchanger temperature sensor 63 Indoor fan motor 65 Hall element 66 Microcomputer 69 Interface circuit 70 LED 71 SSR 72 Indoor fan motor temperature sensor

Claims (3)

(57) [Claims] 1. An air conditioner for controlling the number of revolutions of a fan motor, the number of revolutions detecting means for detecting the number of revolutions of the fan motor and outputting a signal, and detecting the presence or absence of a signal from the number of revolutions detecting means. A plurality of air conditioners that detect the temperature of the fan motor, the ambient air temperature of the air conditioner, and the temperature of the heat exchanger to control the number of rotations of the fan motor. A temperature abnormal location determining means for determining a temperature abnormal location of a component device, a display means for displaying an abnormal location by a signal from the rotation signal abnormal location determining means and the temperature abnormal location determining means,
An air conditioner comprising: 2. A rotational speed signal detecting means provided in an air conditioner for controlling the rotational speed of the fan motor, and detecting the presence or absence of a signal from the rotational speed detecting means for detecting the rotational speed of the fan motor and outputting a signal. An indoor temperature detecting means for detecting an indoor temperature; a heat exchanger temperature detecting means for detecting a heat exchanger temperature of the air conditioner; a fan motor temperature detecting means for detecting a temperature of the fan motor; An abnormal location determining means for determining an abnormal location of a component device for controlling the rotation of the fan motor of the air conditioner based on a signal from the air conditioner; and operating the fan motor in accordance with the abnormal location determined by the abnormal location determining means. An air conditioner characterized by the above-mentioned. 3. The air according to claim 1 or 2, wherein the operation of the fan motor is selected to be continued or stopped in accordance with the abnormal location determined by each abnormal location determining means corresponding to the plurality of constituent devices. Harmony equipment.