JPS60120124A - Abnormality detecting device for air-conditioning machine - Google Patents

Abstract

PURPOSE:To detect the existence of abnormality and specify the place of trouble which caused the abnormality by a method wherein an abnormality deciding unit, detecting the non-coincidence between the operating condition signal of an abnormality detecting objective and an operation command as well as an operating condition signal after a motion delay time has elapsed and deciding the abnormality in respective objectives, is provided in the device. CONSTITUTION:The abnormality detecting device 40 is constituted of an operation information transmitting unit 41, detecting the operating condition of an outdoor machine to send the operating condition signal to an indoor control unit 11, an operation information receiving unit 42, receiving the operating condition signal at the indoor side, and the abnormality deciding unit 43, inputting the operating condition signal and the operation command to decide the abnormality and inputting the result of decision into the indoor control unit 11 to indicate the abnormality. The abnormality deciding unit 43 inputs the operation command from the indoor control unit 11 and controls a compressor, a four-way valve and an outdoor fan. The operating condition after the motion delay time, inputted through the operation information transmitting unit 41 and the operation information receiving unit 42, has elapsed is inputted from the outdoor control unit 16. According to this method, the non-coincidence between the operation command and the operating condition signal is detected and an abnormality determining signal may be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an air conditioner, and in particular to an abnormality detection device capable of determining the location of a failure that has caused an abnormality.

[Technical background of the invention and its problems] In general, the refrigerant circulation system of an air conditioner is an outdoor heat exchanger equipped with a compressor 1, a four-way valve 3, and an outdoor fan 5 on the outside of a partition wall 9, as shown in FIG. 4 and an expansion valve 6 are disposed, and an indoor heat exchanger 7 including an indoor fan 8 is disposed inside the partition wall 9, and these devices except for the outdoor fan 5 and the indoor fan 8 are connected by piping 2. At the same time, a heating cycle is formed by circulating the refrigerant in the direction of arrow A to the cooling cycle in the direction of arrow B according to the operation command of the indoor control unit 11.

A conventional abnormality detection device for detecting abnormalities in such an air conditioner is 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 sent to the storage circuit 2 at predetermined time intervals.
3 is stored. The data in the memory circuit 23 and the set values of the upper limit setting circuit 24 for setting the upper limit of the temperature change and the lower limit setting circuit section for setting the lower limit of the temperature change are compared by adders 26 and 27, respectively, and the deviation is is applied outside the operational amplifier and to the 29 non-inverting input terminals (+), respectively. In addition, the temperature signal of the temperature detection circuit 22 is applied to the operational amplifier side and the inverted long sword terminal 29 ←), and it is thereby possible to determine whether or not the temperature change exceeds the upper limit within a predetermined time. When the change in the lower limit exceeds a predetermined range, a signal of °'H" level is applied to the timer 31. For example, after giving an operation command to the compressor 1, this timer When the temperature of the heat exchanger 7 is normal or the output of the heat exchanger 30 is at the "use" level, an abnormality is detected (signal i is given to the control circuit 10, and the content is displayed on a display (not shown) by giving it to the display circuit 32. urge

Thus, measures are taken to determine that there is an abnormality in the air conditioner when the temperature change is outside the predetermined range after a predetermined time has elapsed since the operation command was given to the compressor 1.

Such conventional abnormality detection devices have a drawback in that even if an abnormality is detected, it is not possible to identify the location of the failure that caused the abnormality.

[Purpose of the invention]

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional devices, and an object of the present invention is to provide an abnormality detection device for an air conditioner that can determine the location of the failure that caused the abnormality.

[Summary of the invention]

In order to achieve this object, the present invention provides an air conditioner in which a control unit that outputs an operation command is placed indoors, an information generation unit that generates a status signal of an abnormality detection target, and an information generation unit that generates an operation command for the abnormality detection target. The apparatus is characterized by comprising an abnormality determination unit that detects a mismatch between the driving command and the driving state signal for each abnormality detection target after an operation delay time has elapsed since the output of the abnormality signal, and determines an abnormality. .

[Embodiments of the invention]

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, and is an example in which the compressor 1 and the four-way valve 3 (FIG. 1) are detected as targets t7. .

In the same figure, a control circuit 1o 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, and an indoor control section 11 that inputs a signal from an operation section 13 and outputs an operation command. An operation command transmitting section 14 that sends out the operation command to the outside, an operation command receiving section 15 that receives the operation command outside the room, and an outdoor unit such as the compressor 1 and the four-way valve 3 based on the output of the operation command reception section. and an outdoor control section 16 that controls the outdoor fan 5. Further, the abnormality detection device 40 detects the operating state of the outdoor unit, and transmits the operating state signal to the inside of the partition wall 9, that is, indoors. A receiving section 42, and an abnormality determining section 43 which inputs the driving state signal and the driving command, performs abnormality determination, and provides the result to the indoor control section 11 to display the abnormality.
It is made up of.

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 sent to an exclusive OR circuit (hereinafter referred to as IBxOR circuit) via an inverter.
The output of this inverter is applied to one input terminal of the inverter via a delay circuit consisting of a resistor R and a capacitor C to the other input terminal, and the EXOR circuit outputs a signal indicating that the operating command has been changed. change detection circuit 51;
and a command change detection circuit 61 which has the same configuration as this and which inputs the operation command (on command) az of the four-way valve 3 and outputs a signal indicating that this operation command has been changed, and a command change detection circuit 61 that detects changes in these commands. Starts operation by the output of the circuit,
By individually setting the time for the corresponding operation status signals fl and f2 to reach the indoor side after the operation commands a1 and az are output, that is, the operation delay time, the abnormality will not be detected until the set time elapses. A timer 52 that outputs a “L” level signal as a detection prohibition command.
and 62, and EXOR circuits 53 and 63, which input the operation commands a1 and az on one side and input the corresponding operation status signals on the other side to detect a mismatch between the two, and output abnormality detection prohibition commands e1 and e2 on one side, respectively. As input, Exo 11. ANT) circuits 54 and 6 which take the circuit mismatch detection signals g1 and g2 as inputs and output the abnormality determination signal h2.
4, and a timer 72 that is started every time it receives an operating status signal (operating information) i, and outputs an information transmission signal J when the next operating information is not received after a predetermined period of time. There is.

The operation of the abnormality detection device constructed as described above will be explained below with reference to time chart 1 of FIGS. 5 and 6.

First, based on the information input from the operation unit 13, for example,
As shown in FIG. 5, at time t1 the "L" level
I I” level, from “H” level to “’■・” level at time t2, and further to “’L” level at time t3.
Compressor 1 that changes to level (color) I°゛ level
When the driving command 21 is output, this driving command a1
is applied to the outdoor control section 16 via the operation command transmitting section 14 and the operation command receiving section 15, and the outdoor control section 16 drives the compressor 1 during the period when this operation command a1 is at the "H1l level." Similarly, when a heating operation command a2 (not shown) is output from 11, the outdoor control unit 16 excites the four-way valve 3. These operating information f1 and f2 of the outdoor unit are transmitted to the operating information transmitting unit 41 and the operating information receiving unit 42. The operation information is sent from the outdoor control section 16 to the abnormality determination section 43 via the operation information transmission section 41 continuously or at regular intervals. 43 or from the indoor control unit 11.
In addition to 82, send out No. 4H indicating that the operation command was output 1
7. When the outdoor control unit 16 receives this signal, it inputs the signal 1 corresponding to this signal to the abnormality determination unit 43 via the driving information transmitting unit 41 and the driving command receiving unit 42.

On the other hand, the driving command "1 + 32" and the signal 1 indicating that these driving commands have been output are applied to the abnormality determination section 43.

In the abnormality determination unit 43, the operation commands a1 and az are received by command change detection circuits 51 and 61, respectively, and it is detected whether or not there is a change in the operation command, that is, a level change, and a single A pulse is applied to timers 52 and 62, respectively. Note that the command change detection circuits 51 and 6
] are configured in exactly the same way, for example, the operation command a1 is inverted by the inverter and g via lCx0
) can be added as the other input of the circuit. However, the signals 1)1 and cl shown in FIG. 5 are applied to this ExOR circuit, and the pulse signal d1, which is at the "If" level, is applied to the timer 52 during the period when the two do not match.

Here, the timer 52 is set longer than the operation delay time of the compressor 1 by (8·m), and the pulse signal d]
The abnormality detection prohibition command e1 is outputted until the set time elapses from the time when the earth is raised, that is, until the time is up.Similarly, the operation command a2
When the command change detection circuit outputs a pulse signal d2 in response to this, the timer 62 outputs an abnormality detection prohibition command e2.

Next, the BxOR circuit 53 detects any discrepancy between the operation command al for the compressor 1 and the operation state signal fl that is delayed by the waiting time td with respect to the operation command a1.
Apply the mismatch detection signal gt to the AN1) circuit 54. As shown in FIG. 5, an abnormality detection prohibition command e1 is applied to the ANI) circuit 54, which maintains IJ at the 1" level for a time T1 every time there is a command change. Therefore, at time t3, “■Ill for the operation command a1 which reaches the 4゛ level. Even after 1 time has passed, the operation status is still % f
1 does not change to the "l-I" level, that is, at time t4, the abnormality determination signal h1 is output. Similarly, when the operating command a2 for the four-way valve 3 and its operating state signal f2 have the same relationship as described above, the AND circuit 64 outputs the abnormality determination signal h2.

On the other hand, the indoor control unit 11 outputs a signal indicating that the driving command has been output, and a pulse signal with a period of ts is transmitted via the driving information transmitting unit 41 and the driving information receiving unit 42 as shown in FIG. is added to timer 72.

The 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 there is incorrect wiring or disconnection between the internal and external machines, a signal J indicating a signal line abnormality is output.

As is clear from this, an abnormality in the compressor 1 can be detected by the abnormality determination signal h1, an abnormality in the four-way valve 3 can be detected by the abnormality determination signal +12, and an abnormality in the signal line can be detected by the signal JV. You can do it.

In addition, in this embodiment, the compressor 1 and the four-way valve 3 are subject to abnormality detection, and an explanation has been given of detecting abnormalities in the signal lines connecting these external machines and internal machines, but the present invention is limited to the external machine. Instead, by providing an abnormality determination unit similar to that described above for the internal unit, it is possible to detect abnormalities for each component of the air conditioner, and by adding these abnormal signals to the indoor control unit 11, the details of the abnormality can be determined. can be displayed on the display unit 12.

Further, 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 tdl of the compressor l,
When the operation delay time td2 of the four-way valve 3 is td2 in tdI, the output of the command change detection circuit 51 is closed to one input, and the output of the command change detection circuit 61 is closed to the other input, as shown in FIG. In addition to circuit 81, this OR, circuit 81
By adding the output of the timer 82 to the timer 82 and adding the output of the timer 82 as one input to the ANI') circuits 8 and 64, a simpler abnormality determination circuit can be constructed. However, the timer 82 has the above operation delay time td.

It is set much larger than td2, and when one timer is used for more abnormality detection targets, it may be set to the maximum operation delay time tdmax, or it may be set larger than this.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, there is provided an information generating section including an operating information transmitting section and an operating information receiving section for generating an operating state signal to be detected as an abnormality, and a driving command to be detected as an abnormality is output. The system is equipped with an abnormality determination unit that detects mismatches between the operation command and the operation status signal after the operation delay time has elapsed for each abnormality detection target, and determines whether or not there is an abnormality in the air conditioner. It is possible to identify the failure location that caused the abnormality, and thereby take optimal measures.

Furthermore, by adding a circuit that detects whether operating information is sent from the outdoor unit, it is possible to detect incorrect wiring and disconnection of signal lines.

In addition, the abnormality determination section constituting the present invention mainly consists of a logic circuit and a timer, which greatly simplifies the configuration, and also enables a configuration in which one timer is used for multiple abnormality detection targets. It would be possible to further simplify the configuration.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circulation system diagram showing the general configuration of an air conditioner, FIG. 2 is a block diagram showing the configuration of a conventional abnormality detection device for an air conditioner, and FIG. Block diagram illustrating the configuration of an embodiment of an abnormality detection device for a harmonic machine, No. 4
The figure is a circuit diagram showing the detailed configuration of the main elements of the same embodiment,
5 and 6 are time charts for explaining the operation of the same embodiment, and FIG. 7 is a circuit diagram showing the configuration of another embodiment. ■... Compressor, 3... Four-way valve, 4... Outdoor heat exchanger, 7... Indoor heat exchanger, 10... Control circuit, 40... Abnormality detection device, 41... Driving information transmitting unit, 42... Driving information receiving unit, 43... Abnormality determining unit,
51, 61... Command change detection circuit, 52, 62
, 72 , 82 ... timer, 53 , 63 ... exclusive OR circuit, 54 , 64 ... ANI) circuit, 81
...OR circuit. Applicant's agent Kiyoshi Inomata

Claims (4)

[Claims] (1) In an air conditioner in which a control unit that outputs operation commands is located indoors, there is an information generation unit that generates an operation status signal targeted for abnormality detection, and an operation delay after the operation command targeted for abnormality detection is output. An abnormality detection device for an air conditioner, comprising: an abnormality determination unit that detects a mismatch between the operation command and the operation state signal after a lapse of time for each of the abnormality detection targets, and determines an abnormality. (2) When the outdoor unit is targeted for abnormality detection, the information generating unit includes an operating information transmitting unit that detects the operating state of the outdoor unit and transmits operating information to the indoor side, and an operating information transmitting unit that receives this operating information indoors. 2. The abnormality detection device for an air conditioner according to claim 1, further comprising an operation information receiving section added to said abnormality determining section. (3) The abnormality determination unit includes a command change detection means for detecting a change in the driving command, a timer capable of setting an operation delay time of the abnormality detection target, and responding to the previous = own driving command; The air conditioner according to claim 1 or 2, further comprising a logic circuit that detects a mismatch between the operation command and the operation information, and prohibits output until the timer clock times up. Machine abnormality detection device. (4) The abnormality detection device for an air conditioner according to claim 2 or 3, wherein the operating information transmitter outputs the operating information every predetermined cycle.