JPH0416686B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is arranged separately into an indoor unit and an outdoor unit, and an indoor control section provided in the indoor unit outputs operation commands for functional parts of the outdoor unit. The present invention relates to an abnormality detection device for an air conditioner that includes an outdoor control section that receives operation commands and controls functional components of the outdoor unit.

[Conventional technology]

Generally, the refrigerant circulation system of an air conditioner includes a compressor 1, a four-way valve 3, an outdoor heat exchanger 4, an outdoor fan 5, and an expansion valve 6 arranged outside the partition wall 9, as shown in FIG. Indoor heat exchanger 7 inside,
An indoor fan 8 is provided, and these devices except the outdoor fan 5 and the indoor fan 8 are connected by a pipe 2, and the refrigerant is circulated in the direction of arrow A according to an operation command from the indoor control unit 11. Therefore, a cooling cycle and a heating cycle are respectively formed by circulating the refrigerant in the direction of arrow B.

In such an air conditioner, an abnormality detection device is provided on the indoor side because it is necessary to display an abnormality on the indoor side. As this conventional abnormality detection device, there was one shown in FIG. That is, the temperature signal of the temperature detection circuit 22 calculated based on the temperature sensor 21 of the indoor heat exchanger 7 is sequentially stored in the storage circuit 23 at predetermined time intervals. An upper limit setting circuit 2 that sets the upper limit for the data in this memory circuit 23 and the temperature change.
4 and the setting value of the lower limit setting circuit 25 for setting the lower limit of the temperature change are added to the adders 26 and 2, respectively.
7, and the deviations thereof are added to the non-inverting input terminals (+) of operational amplifiers 28 and 27, respectively. Note that the temperature signal of the temperature detection circuit 22 is applied to the inverting input terminals (-) of the operational amplifiers 28 and 29, and it is determined whether or not the temperature change exceeds the upper limit within a predetermined time. and a signal indicating whether the lower limit has not been reached is input to the exclusive OR circuit (hereinafter referred to as ExOR circuit) 30, and becomes “H” when the temperature change is outside the predetermined range.
A level signal is applied to the timer 31. For example, after giving an operation command to the compressor 1, this timer starts operating the indoor heat exchanger 7.
This is to set the expected time for the temperature to change normally.If the output of the ExOR circuit 30 is still at the "H" level even after the set time of the timer 31 has elapsed, an abnormality is detected in the control circuit 10. A signal is given to the display circuit 32 and its contents are displayed on a display (not shown).

Thus, if the temperature change is outside a predetermined range after a predetermined time has elapsed since the operation command was given to the compressor 1, it is determined that there is an abnormality in the air conditioner.

[Problem to be solved by the invention]

However, such conventional abnormality detection devices detect abnormalities only based on the temperature of the indoor heat exchanger, so even if an abnormality is detected, the failure location that caused the abnormality, such as the operation command, cannot be detected. However, there is a drawback that it is not possible to determine whether the compressor 1 is not operating or the outdoor fan is not operating.

[Means to solve the problem]

In the present invention, an indoor unit and an outdoor unit are arranged separately, and an indoor control section provided in the indoor unit outputs operation commands for a plurality of functional parts of the outdoor unit, and receives the operation commands to perform functions of the outdoor unit. In an air conditioner equipped with an outdoor control unit that controls parts, the outdoor unit is equipped with an operation information transmitter that detects the operating status of multiple functional parts and transmits an operating status signal to the indoor unit at predetermined intervals. The operation command output from the operation information receiving unit and the indoor control unit that receive the operation status signal of the information transmission unit, and the operation after the operation delay time from when this operation command is output until each functional component operates. This is an abnormality detection device for an air conditioner in which an indoor unit is provided with an abnormality determination section that detects a discrepancy with an operating state signal received by an information receiving section for each functional component and determines whether each functional component is abnormal.

[Effect]

According to this invention, after the operation delay time for each functional component to operate has elapsed, it is detected indoors that the functional component is in an operating state different from the operating command output from the indoor control unit. Detected by an abnormality determination unit installed in the machine.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a block diagram showing the configuration of the abnormality detection device for an air conditioner according to the present invention together with a control circuit, in particular the compressor 1 and the four-way valve 3 (first
This is an example of a detection target.

In the figure, a control circuit 10 inputs a signal from an operation section 13 and outputs an operation command, and an indoor control section 11 which adds a signal indicating an operation mode etc. to a display section 12; An operation command transmitter 14 that sends out to the outdoor unit, and an operation command receiver 15 that receives the operation command outside the room.
It is comprised of an outdoor control section 16 that controls the compressor 1, four-way valve 3, and outdoor fan 5, which are functional parts in the outdoor unit, based on the output of the operation command receiving section 15. Further, the abnormality detection device 40 detects the operating state of the outdoor unit and sends the operating state signal to the inside of the partition wall 9, that is, to the indoor unit, and the operating information transmitter 41 receives this operating state signal on the indoor side. The driving information receiving section 42 receives this driving state signal, inputs the driving state signal and the driving command, performs abnormality determination, and gives the result to the indoor control section 11 to display the abnormality. and an abnormality determination section 43 that performs the determination.

FIG. 4 is a circuit diagram showing the detailed configuration of the abnormality determination section 43, in which the operation command a1 of the compressor 1 is
Exclusive OR circuit (below) via an inverter
The output of this inverter is applied to one input terminal of an ExOR circuit (referred to as an ExOR circuit) and the other input terminal via a delay circuit consisting of a resistor R and a capacitor C. A command change detection circuit 51 that outputs a signal, and a command change circuit that has the same configuration as this and inputs an operation command (ON command) a2 of the four-way valve 3 and outputs a signal indicating that this operation command has been changed. The operation is started by the outputs of the detection circuit 61 and the command change detection circuits 51 and 61, and after the respective operation commands a1 and a2 are output, the corresponding operation status signals f1 and f2 are output to the indoor side. The timer 52 and 62 outputs an "L" level signal as an abnormality detection prohibition command until the set time has elapsed by individually setting the time to reach , that is, the operation delay time, and the operation command. a1
ExOR circuits 53 and 63 which detect a mismatch between the two by using a2 and a2 as one input, and the corresponding operating status signal as the other input.
and error detection prohibition commands e1 and e2 are respectively input on one side, and the mismatch detection signal g1 of the ExOR circuit is
AND circuits 54 and 64 output abnormality determination signals h1 and h2 by inputting signals h1 and g2, respectively, and are activated every time an operating status signal (operating information) i is received, and are activated even after a predetermined period of time has elapsed. The timer 72 outputs an information transmission abnormality signal j when no information is received.

The operation of the abnormality detection device configured as described above will be explained below with reference to the time charts of FIGS. 5 and 6.

First, based on the information input from the operation unit 13,
For example, as shown in FIG.
level to “H” level, “H” at time t2
When the operation command a1 of the compressor 1 that changes from level to "L" level and then from "H" level to "L" level at time t3 is output, this operation command a1 is transmitted to the operation command transmitter 14 and the operation command is added to the outdoor control unit 16 via the receiving unit 15,
The outdoor control unit 16 drives the compressor 1 during the period when the operation command a1 is at the "H" level. Also,
Heating operation command a2 (not shown) from the indoor control unit 11
When the “H” level is output, the outdoor control section 16
excites the four-way valve 3. And Compressa 1
Operation information f1 of the outdoor unit for driving and excitation of the four-way valve 3
and f2 are sent to the abnormality determining section 43 via the driving information transmitting section 41 and the driving information receiving section 42. Note that the outdoor control unit 16 sends the driving information indoors via the driving information transmitting unit 41 continuously or at regular intervals. Then, the signal i received from outside is input to the abnormality determination section 43, or the indoor control section 1
In addition to the driving commands a1 and a2 described above, a signal indicating that the driving command has been output is sent from 1, and when the outdoor control unit 16 receives this, this signal is sent via the driving information transmitting unit 41 and the driving information receiving unit 42. A signal i corresponding to the signal is input to the abnormality determination section 43.

On the other hand, the driving commands a1, a2 and a signal i indicating that these driving commands have been output are applied to the abnormality determination section 43.

In the case of the abnormality determination section 43, the operation commands a1 and a2 are sent to command change detection circuits 51 and 61, respectively.
In response to dw, it is detected whether or not there is a change in the operating command, that is, a level change, and a single pulse is applied to the timers 52 and 62 each time there is a change.
Note that the command change detection circuits 51 and 61 have exactly the same configuration. For example, the operation command a1 is inverted by an inverter and applied as one input of the ExOR circuit, and the inverted signal is further input by the resistor R and the capacitor C. It is added as the other input of the ExOR circuit via a delay circuit. However, this
The signals b1 and c1 shown in FIG. 5 are applied to the ExOR circuit, and the pulse signal d1, which is at the "H" level during the period when the two do not match, is applied to the timer 52.

Here, the timer 52 is set to be slightly longer than the operation delay time of the compressor 1, and remains "L" until the set time elapses from the rising edge of the pulse signal d1, that is, until the time is up.
An abnormality detection prohibition command e1 that becomes the level is output.
Similarly, when the command change detection circuit outputs the pulse signal d2 in response to the operation command a2, the timer 62 outputs the abnormality detection prohibition command e2.

Next, the ExOR circuit 53 issues an operation command a1 to the compressor 1 and a td to this operation command a1.
The AND circuit 54 detects a discrepancy with the operating state signal f1 that is delayed by the time, and sends the discrepancy detection signal g1 to the AND circuit 54.
Add to. As shown in FIG. 5, this AND circuit 54 is set to "L" for a time T1 every time there is a command change.
Since the abnormality detection prohibition command e1 that becomes the level is added, the operating state signal f1 changes to the "H" level even after the time T1 has passed in response to the operation command a1 that becomes the "H" level at time t3. When not, that is, at time t4, the abnormality determination signal h1 is output. Similarly, when the operation command a2 for the four-way valve 3 and its operation state signal f2 have the same relationship as described above, the AND circuit 64 outputs the abnormality determination signal h2.

On the other hand, a signal indicating that a driving command has been output is output from the indoor control unit 11, and a pulse signal i with a period of ts is transmitted to the timer 72 via the driving information transmitting unit 41 and the driving information receiving unit 42 as shown in FIG. added to. This timer 72 detects the rising edge of this pulse and holds the output at the "L" level for a time T2, which is slightly longer than ts. Thus, when the indoor unit and the outdoor unit are incorrectly wired or disconnected, a signal j indicating a signal line abnormality is output.

As is clear from this, the abnormality determination signal h
1 can detect an abnormality in the compressor 1, the abnormality determination signal h1 can detect an abnormality in the compressor 1, the abnormality determination signal h2 can detect an abnormality in the four-way valve 3, and the signal j can detect an abnormality in the signal line. can be detected.

In this embodiment, compressor 1 and four-way valve 3
as the target for abnormality detection, and detect abnormalities in the signal lines connecting these indoor units and outdoor units, respectively.
The contents of these abnormalities can be displayed on the display unit 12.

In the above embodiment, a timer is provided for prohibiting abnormality detection for a time corresponding to the operation delay for each abnormality detection target, but the operation delay time td1 of the compressor 1 and the operation delay time td2 of the four-way valve 3 are
When td1≒td2, as shown in FIG. The output of this timer 82 is added to the timer 82, and the output of this timer 82 is added to the timer 82.
By adding them as one input to each of the AND circuits 54 and 64, a simpler abnormality determination circuit can be constructed. However, the timer 82 is set to be larger than the operation delay times td1 and td2, and the timer 82 is set to be larger than the operation delay times td1 and td2.
Maximum operation delay time when using two timers
You can set it to tdmax or slightly larger than this.

〔Effect of the invention〕

As is clear from the above description, in the present invention, the indoor control unit provided in the indoor unit outputs operation commands for a plurality of functional parts of the outdoor unit, receives the operation commands, and controls the functional parts of the outdoor unit. In an air conditioner equipped with an outdoor control unit to control, the outdoor unit is provided with an operation information transmission unit that detects the operation status of a plurality of functional parts and transmits an operation status signal to the indoor unit at predetermined intervals, and the operation information is transmitted to the indoor unit. Operation commands output from the operation information receiving unit and the indoor control unit that receive the operation status signals of the transmitter, and operation information after the operation delay time from when the operation command is output until each functional component operates. Since the indoor unit is equipped with an abnormality determination section that detects discrepancies with the operating status signal received by the receiving section for each functional component and determines whether each functional component is abnormal, the indoor unit can detect whether or not there is an abnormality in the air conditioner. Needless to say, this has the effect of being able to identify the location of the failure that caused the abnormality.

[Brief explanation of drawings]

Figure 1 is a refrigerant circulation system diagram showing the general configuration of an air conditioner, Figure 2 is a block diagram showing the configuration of a conventional air conditioner abnormality detection device, and Figure 3 is an air conditioner according to the present invention. FIG. 4 is a circuit diagram showing the detailed configuration of the main elements of the embodiment, and FIGS. 5 and 6 are for explaining the operation of the embodiment. FIG. 7 is a circuit diagram showing the configuration of another embodiment. DESCRIPTION OF SYMBOLS 1... Compressor, 3... Four-way valve, 4... Outdoor heat exchanger, 7... Indoor heat exchanger, 11... Indoor control unit, 1
6... Outdoor control unit, 40... Abnormality detection device, 41... Operating information transmitting unit, 42... Operating information receiving unit, 43... Abnormality determination unit, 51, 61... Command change detection circuit, 5
2, 62, 72, 82...Timer, 53, 63...Exclusive OR circuit, 54, 64...AND circuit, 81
...OR circuit.

Claims (1)

[Claims] 1 The indoor unit and the outdoor unit are arranged separately, and the indoor control unit provided in the indoor unit outputs operation commands for multiple functional parts of the outdoor unit, receives these operation commands, and controls the functional parts of the outdoor unit. In the air conditioner, the outdoor unit is provided with an operation information transmitter that detects the operating states of the plurality of functional components and transmits an operating state signal to the indoor unit at predetermined intervals, The driving information receiving unit that receives the driving status signal of the driving information transmitting unit and the driving command output from the indoor control unit, and the elapsed operation delay time from when the driving command is output until each of the functional parts operates. The indoor unit is further provided with an abnormality determination unit that detects, for each of the functional parts, a discrepancy with the driving state signal received by the subsequent driving information receiving unit and determines whether each of the functional parts is abnormal. Air conditioner abnormality detection device.