JPH11193971A - Method for storing data of gas heat pump (ghp) and system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for storing data of a GHP to accurately judge a fault content without increasing a memory capacity and provide its system. SOLUTION: This method for storing data of a gas heat pump comprises the steps of detecting data of sections such as an engine, a compressor and the like of the pump in a predetermined period based on control data, storing detected data of predetermined number of times, and verifying the contents (201 to 203). If the detected data are fault data, the control data are altered to select a type of the detected data, the period of detecting the data and a data amount stored (210). Since the stored data and its period can be selected by altering the control data, a cause discovering at the time of the fault due to an insufficient capacity of the memory can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for storing data of a gas heat pump (hereinafter, also referred to as GHP). In particular, the present invention relates to a GHP data storage method capable of selectively storing data according to the type of GHP abnormality.

[0002]

2. Description of the Related Art First, a basic configuration of a conventional general gas heat pump will be described based on a cooling device.
FIG. 4 is a system diagram showing a configuration of a heat cycle including a gas engine driven compressor. This heat cycle 1
00 denotes a compressor 101, a condenser 113, an expansion valve 115,
It consists of evaporators 117 and pipes connecting them.

[0003] A compressor 101 is driven by a gas engine 102 (motor). The gas engine 102 is a reciprocating engine (or turbine) that receives supply of city gas from a gas supply pipe 103 and uses the gas as fuel.
The speed (output) of the gas engine 102 is controlled by a gas flow control valve 104 of a gas supply pipe 103. The compressor 101 sucks the refrigerant from the suction port 101a, compresses the refrigerant, and discharges the refrigerant from the discharge port 101b.

[0004] The compressed refrigerant is cooled and condensed in the condenser 113 by receiving external air from the fan 114. The condensed refrigerant is sent to an indoor air conditioner or the like, and is expanded by the expansion valve 115 and the evaporator 117.
A large amount of heat is taken from the air sucked in 18 to cool the room. The refrigerant returns from the evaporator 117 to the compressor 101 again, and thereafter circulates similarly.

[0005] Some of the conventional general GHPs described above have an abnormality detection function of detecting abnormality when an abnormality occurs and storing abnormality information (data). This abnormality detection function is performed when a GHP stops abnormally, for a certain period from the time of abnormal stop of values (data) such as temperature and pressure of each device constituting the GHP until the occurrence of the abnormality to a certain point in the past. The minutes can be stored in a non-volatile memory such as an EEPROM (hereinafter also simply referred to as a memory).

[0006] Workers who maintain and repair the GHP are:
The data in the non-volatile memory is read, an abnormal part is specified, and the abnormal part is repaired.

FIG. 5 is a flow chart when the GHP stops due to an abnormality. In FIG. 5, first,
While the GHP is in operation, predetermined types of data are automatically stored in the memory at predetermined time intervals (for example, every 30 seconds). At this time, since the storage capacity of the memory is limited, data for a certain period is stored,
Control is performed so that oldest data is rewritten to new data in order (501). Next, the new data is stored in the memory, and at the same time, the new data is verified (502), and it is determined whether or not the data satisfies each reference value, that is, whether or not each device has an abnormality (503). ). If there is no abnormality, the operation from step 501 is repeated.

If there is abnormal data, the GHP enters the abnormality monitoring mode and determines whether to stop the GHP (504). For this determination criterion, a reference value is determined according to the type of data, and it is determined whether abnormal data has been detected more than a predetermined number of times within a predetermined time. If the predetermined reference is not exceeded, the operation from step 501 is repeated again. On the other hand, when the value exceeds a predetermined reference value,
The GHP is stopped by issuing an abnormality while the data for a certain period is stored in the memory (505). For example, in the abnormality monitoring mode (steps 504 and 505), if the type of data is the engine speed,
A signal of 0 rpm or less is regarded as abnormal data, and when this data is counted 5 times within 2 hours, an abnormality is reported and GH is output.
Stop P. It should be noted that, even during the abnormality monitoring mode, predetermined data is stored in the memory at predetermined time intervals, as in step 501 described above.

[0009] In response to the above-mentioned abnormality notification from the GHP, the worker goes to the site and displays the data in the memory on the display device for confirmation (506). FIG. 6 is a diagram illustrating data in the memory displayed on the display device. In FIG.
The memory has a capacity capable of storing data at intervals of 10 seconds for four times. Returning to FIG. 5, the worker repairs or adjusts the GHP failure or abnormal location according to the data displayed on the display device as shown in FIG. Is restarted (507). still,
The types of data stored at regular intervals and predetermined reference values described above are stored in a partial area of the memory.

[0010]

However, according to the conventional method of storing data when an abnormality occurs in the GHP as shown in FIG. 5, the capacity of the memory is limited, and the type of data to be stored is limited. Also, the storage period is fixed to a predetermined value, so depending on the state or location of the abnormality, the state of the abnormality cannot be accurately determined from the data in the memory, and repair or adjustment is difficult. There was a problem that it took time. For example, in FIG. 6, the value of “engine present” indicating the actual engine speed is 20
It can be understood that the engine stalls after falling for a second, but from the data in Fig. 2 only,
I do not know whether the value of has dropped.

When the memory capacity is increased, GH
There is a problem that the cost of the P device itself increases as the memory increases.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method of storing data in the event of a GHP abnormality that allows accurate determination of an abnormality without increasing the memory capacity. It is to be.

It is another object of the present invention to provide a data storage system in the event of a GHP abnormality that allows accurate determination of the nature of the abnormality without increasing the memory capacity.

[0013]

In order to solve the above-mentioned problems, a method for storing data of a gas heat pump according to the present invention is to store data of each part such as an engine and a compressor of a gas heat pump in a predetermined cycle based on control data. A data storage method for a gas heat pump that stores detection data for a predetermined number of times by detecting the type of the data to be detected by changing the control data; and the cycle of detecting the data; The amount of data to be stored can be selected. By changing the control data, the data to be stored and the cycle thereof can be selected, so that it is possible to solve the problem related to investigating the cause at the time of abnormality due to insufficient memory capacity.

According to another aspect of the present invention, there is provided a gas heat pump data storage system which detects data of each unit such as an engine and a compressor of a gas heat pump at a predetermined cycle based on control data. A data storage device for a gas heat pump that stores detection data for a predetermined number of times; a storage unit that stores the detection data; a change unit that changes the control data; and a control unit that changes the control data based on the control data changed by the change unit. And control means for controlling the type of the data to be detected, the cycle for detecting the data, and the amount of data stored in the storage means. By changing the control data, the data to be stored and the cycle thereof can be selected, so that it is possible to solve the problem related to investigating the cause at the time of abnormality due to insufficient memory capacity.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A GHP data storage method and system according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration example of a GHP data storage system of the present invention. The GHP data storage system includes a control unit 1 for controlling each device.
And a non-volatile memory (hereinafter also referred to as a memory) 2 such as an EEPROM for storing abnormal data, a clock circuit 3 for generating a clock signal, an input unit 4 for inputting data and the like, A display unit 5 such as a liquid crystal device for displaying data stored therein, and a GH as a monitored unit
A signal detection unit 6 connected to each device of P (for example, a gas engine, a compressor, etc.) and detecting a signal indicating a state of each device.
(6a, 6b,...).

Here, the memory 2 includes a control table 2a for storing the type of data to be stored and a reference value for determining an abnormality, and a data area 2b for storing a signal from the signal detection unit 6 as data. Have.

Hereinafter, the GH of the present invention having the above-described structure will be described.
The operation of the P data storage system will be described. FIG. 2 is a flowchart when the GHP stops due to an abnormality. In FIG. 2, first, when the GHP operates, the control unit 1 controls the control data stored in the control table 2 a of the memory 2, that is, the type of data to be stored, and the time interval (sampling period) of the storage operation. Then, a reference value corresponding to the number of data to be stored and the type of each data is read (201). The control unit 1 receives a signal corresponding to the type of the read data from the signal detection unit 6 and stores the signal in the data area 2b of the memory 2 as detection data. At this time, based on the clock signal from the clock circuit 3, the control unit 1 periodically repeats the recording operation at time intervals read from the control table 2a. Further, since the storage capacity of the data area 2b of the memory 2 is limited, the control unit 1 stores the detected data for the number of cycles read out from the control table 2a, and stores the detected data for a certain period. The detected data is stored and rewritten with new data in order from the oldest data (202).

Next, the control unit 1 stores the new detection data from the signal detection unit 6 in the memory and at the same time verifies the new detection data based on the reference value (203). Is satisfied, that is, whether there is any abnormality in each device (204). If there is no abnormality, the operation from step 202 is repeated.

When there is abnormal data, the control unit 1
The GHP is set to the abnormality monitoring mode, and it is determined whether to stop the GHP (205). This determination criterion is determined according to the type of data, and is a reference value stored in advance in the control table 2a, for example, whether abnormal data exceeding a value in a predetermined range within a predetermined time is detected a predetermined number of times. To judge. If it does not exceed the predetermined reference value, the operation from step 202 is repeated again. On the other hand, when the value exceeds the predetermined reference value, the GHP is stopped by issuing an abnormality while the data for a certain period is stored in the memory (20).
6).

For example, in the abnormality monitoring mode (step 205)
In 206) and 206), when the type of data is the engine speed, the control unit 1 regards a signal having a speed of 700 rpm or less as abnormal data and outputs this signal within 5 hours within 5 hours.
When counting has been performed twice, an abnormality is issued and the GHP is stopped. That is, the reference value corresponding to the engine speed data stored in the control table 2a is 700 rpm
m, a predetermined time of 2 hours, and a predetermined number of detections of 5 times.
Note that even during the abnormality monitoring mode, the above-described step 202
Similarly, predetermined data is stored in the memory at predetermined time intervals.

When the GHP is stopped, the worker goes to the site by the above-mentioned abnormality notification from the GHP, and
The stored data in the data area 2b is displayed and confirmed on the display unit 5 (207).

In the case where a faulty part or an improper adjustment can be identified by the contents of the displayed data (208), the faulty part or the abnormal part is repaired or adjusted to eliminate the cause of the abnormality (20).
9) After that, the operation of the GHP is restarted (first step 20).
Start operation from 1). In the case where a faulty part or an improper adjustment cannot be specified by the contents of the displayed data (208),
The necessary data type and sampling period are input from the input unit 4 (210), and the GHP operation is restarted by using the data read from the control table 2a of the memory 2 instead of the data (from step 202). Operation). At this time, the value input from the input unit may be stored by overwriting the corresponding control data in the control table 2a. However, a dedicated area for the input 4 is provided in the control table 2a, The input control data may be stored in the dedicated area and may be used preferentially.

In this way, only data that is abnormally related can be effectively collected and stored.
Since the type of data to be stored can be specified, the number of times of storage can be increased.

FIG. 3 shows the memory 2 after resetting the control data.
FIG. 5 is a diagram showing data stored in a data area 2b of the first embodiment and displayed on a display device. In the data storage system according to the present invention at the time of occurrence of a GHP abnormality, the capacity of the memory 2 is the same as that of the conventional memory. See FIG. 6). As described in the related art, the cause of the engine stall was not understood from the data in FIG.

However, in the GHP data storage system of the present invention, the storage data (control data) at the time of occurrence of an abnormality can be arbitrarily set (step 21 in FIG. 2).
0), eight times of data can be collected and stored as shown in FIG. In the data of FIG. 3, after the C / P clutch 2 is turned ON, that is, after the number of C / P clutches is increased, the engine speed (“engine current”) becomes unstable, causing engine stall. I understand. Therefore, it can be determined that the cause of the abnormality is insufficient engine torque with respect to the C / P clutch.

As described above, even in an abnormal state where the cause could not be determined conventionally, more detailed data can be obtained, and the cause of the abnormality can be clarified.

Although the embodiment of the GHP data storage method and system of the present invention has been described above, the control data may be automatically changed by the control unit 1. That is, the control unit 1 specifies an abnormality content and an abnormality target from the first abnormality detection, and automatically selects only predetermined data (minimum data) according to the specified result. The selected data may be stored. The display device for displaying data is G
It may be built in the HP, or may be connected to the GHP later by an operator. Furthermore, after reading only the data from the GHP, the data may be displayed on a separate display device.

As a modification of the present invention, a communication system is provided in the GHP so that data in a memory can be transmitted to a predetermined base station via a telephone line or the like, and control data is transmitted from the base station to the GHP. It can also be sent. In addition to the memory, a floppy disk (F
D), a writable compact disc (CD), a mini disc (MD), or the like, and data can be stored in these. However, since these devices add new hardware to the conventional GHP, they are disadvantageous in terms of cost as compared with the above-described embodiment of the present invention.

[0029]

As described above, according to the GHP data storage method and system of the present invention, data to be collected and stored when a GHP abnormality occurs can be selected, and the collection and storage cycle can be shortened. As a result, a large amount of data can be stored, so that it is possible to accurately determine the content of the abnormality without increasing the memory capacity, and to immediately perform appropriate repairs and adjustments.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a GHP data storage system according to the present invention.

FIG. 2 is a flowchart illustrating a method of storing GHP data according to the present invention.

FIG. 3 is a system diagram showing data selectively stored in a GHP data storage system.

FIG. 4 is a schematic diagram showing one form of a conventional GHP.

FIG. 5 is a diagram showing a flowchart of a conventional GHP data storage method.

FIG. 6 is a system diagram showing data selectively stored in a conventional GHP data storage system.

[Explanation of symbols]

 Reference Signs List 1 control unit 2 memory 2a control table 2b data area 3 clock circuit 4 input unit 5 display unit 6 signal detection unit

Claims (8)

[Claims] 1. A data storage method for a gas heat pump for detecting data of each part such as an engine and a compressor of a gas heat pump at a predetermined cycle based on control data and storing detection data for a predetermined number of times; A data storage method for a gas heat pump, wherein the type of the detected data, the cycle of detecting the data, and the amount of data to be stored can be selected by changing the control data. 2. The data storage method for a gas heat pump according to claim 1, wherein the control data is stored in a storage medium incorporated in the gas heat pump in advance. 3. The method according to claim 1, wherein the control data is automatically changed by a control unit of the gas heat pump. 4. The data storage method for a gas heat pump according to claim 1, wherein the control data is changed by an external input. 5. A data storage system for a gas heat pump, which detects data of each unit such as an engine and a compressor of a gas heat pump at a predetermined cycle based on control data and stores detection data for a predetermined number of times; Storage means for storing the detection data, change means for changing the control data, based on the control data changed by the change means, the type of the data to be detected, and the cycle for detecting the data, Control means for controlling the amount of data stored in the storage means; and a data storage system for a gas heat pump. 6. The data storage system for a gas heat pump according to claim 5, wherein said control data is stored in said storage means in advance. 7. A data storage system for a gas heat pump according to claim 5, wherein said changing means is automatically controlled by said control means. 8. The data storage system for a gas heat pump according to claim 5, wherein the upper and lower change means is an external input device.