JP3270993B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to an air conditioner, in particular, it relates to an air conditioner for performing a retry stop control for avoiding the alarm stop.

[0002]

2. Description of the Related Art Conventionally, as a method for controlling a retry stop of an air conditioner, as shown in a package air conditioner technical handbook issued by Hitachi, the retry stop condition is constant and the number of retry stops until an alarm is stopped is also constant. This is the general method.
It is convenient from the viewpoint of maintenance to be able to avoid an abnormal stop when an abnormality occurs accidentally or when an abnormality occurs that does not damage the air conditioner.

However, when it is required to operate the air conditioner so as to avoid stopping the air conditioner as much as possible, it is necessary to restore the abnormal stop and then restart the operation.

[0004] Further, there is no description about retry stop conditions, rewriting and selection of the number of retries.

[0005] Further, the operation method after the restart from the stop of the retry is constant, and there is no description about the operation method in which the operation method is restricted.

[0006]

In the above prior art, the air conditioner is forcibly operated even if some damage is caused to the components of the air conditioner after the retry is stopped. Even if it is desired not to damage the constituent devices any more, it is impossible to operate the air conditioner that satisfies these conditions because the retry stop conditions and the number of retry stops are constant.

It is therefore an object of the present invention to provide an air conditioner that can freely select or change the conditions for stopping retry and the number of times of retry stop according to the user's intention.

[0008]

[0009]

To achieve the above object, according to an aspect of, air conditioner of the present invention includes means for detecting air-conditioning machine of the temperature when the air conditioner is operating, the pressure, the compressor means for detecting a current value of the means for detecting the operating state of the protection device of the air conditioner, the means for determining abnormality of the air conditioner by the detection, retry an over extent to abnormal stop its discretion in the air conditioner having a chair Ru unit, the number of retries and its each control type of air conditioner
Data pattern consisting of retry detection conditions for the number of times
A data table in which a plurality of
The means for trying is a data pattern of the data table.
Based on the retry count and detection conditions selected from the
To retry stop control Te characterized.

Thus, the present invention has means for changing the condition for stopping the retry according to the number of retries, so that even if an abnormality occurs in the air conditioner, the forced operation of the air conditioner desired by the user can be performed. And operation that does not damage the air conditioner can be realized.Also, by changing the number of retries, the air conditioner is forcibly operated even if the air conditioner components are slightly damaged. It can also be done.

[0011] The retry detection conditions are as follows.
If you want to keep it constant,
Data patterns for conditions that are easy to detect gradually
Is preferred.

Further, the data table may include the air conditioner.
Can be rewritten from outside the machine via a communication line
Is preferred. ,

[0013]

[0014]

[0015]

[0016]

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a control device 1 for an air conditioner according to the present invention.
1 is a system configuration diagram of an air conditioner equipped with a.

The outdoor unit 2 includes a communication line 5 and a refrigerant pipe 6.
Is connected to the indoor unit 3. The remote control switch 4 is connected to the indoor unit 3 by a communication line 5. This system has a personal computer 7 via a communication line 5
Can also be connected. The control device 1 is incorporated in the outdoor unit 2.

FIG. 2 is a functional block diagram of the control device 1 of FIG. The control device 10 mainly manages the entire control of the air conditioner, and is often in the form of a printed circuit board. The main components include a data input circuit 11, a protection device detection circuit 18, an output circuit 1b, a communication unit 1g, and a control unit 1h.

The data input circuit 11 has an A / D converter, and has a compressor discharge gas temperature sensor 12 in the air conditioner.
An outside air temperature sensor 13, a heat exchange pipe temperature sensor 14, a compressor discharge pressure sensor 15, a compressor suction pressure sensor 16, and a compressor current sensor 17 are connected, and the detected data is taken in and transmitted to the control means 1h. Protection device detection circuit 1
8 fetches a signal indicating the operation state of the high-pressure cutoff device 19 and the internal thermo 1a and transmits the signal to the control means 1h. The output circuit 1b is operated by a command from the control means 1h to control the compressor 1c, the electronic expansion valve 1d, the fan motor 1e, the four-way valve 1f.
To work.

The communication means 1g exchanges data with an indoor unit or exchanges data with a personal computer. The control means 1h mainly includes a microcomputer, and comprises a ROM in which a program is written, a RAM required for processing of the microcomputer operation, and a nonvolatile storage means for storing a data table required for the present invention. Can communicate.

FIG. 3 shows an example of main functions and data processing for the control means to realize the present invention. When power is supplied to the air conditioner, as shown in the flowchart of FIG.
It is checked whether data has already been written to the retry condition determination data table 32 in the nonvolatile storage means.
At this time, if it has not been written, the retry condition initial data table 30 is written into the retry condition determination data table 32, and if it has already been written, it is used as it is. Similarly, for the number of retries, after the power is supplied,
Is checked, and if not written, the retry count initial data table 31 is written to the retry count determination data table 33. If written, the data is used as it is.

Thereafter, a retry determination data table 34 is created by the control means 1h from the retry condition determination data table 32 and the retry count determination data table 33. In the structure of this data table, as shown in FIG. 5, the number of times of retry is at the beginning, and data of the detection conditions for the number of times of retry are added after that. The last data in the table is also data at the time of abnormal stop.

The retry count judgment data is 1 from 0 to 255
When the value is 0, the retry is stopped. When the value is 255, the retry is infinite. In the embodiment of the present invention, the retry determination data table is synthesized and created. However, the retry condition selection unit 38 may search for data individually.

In this embodiment, there are three types of data table structure: a case where the detection conditions are constant, a case where the conditions are gradually difficult to detect, and a case where the conditions are gradually easy to detect. The number can be set freely within the range of the storage capacity according to the intention of the above, and the data pattern of the detection condition can be set at random.

Further, the retry condition determination data table 34 incorporates means 36 for directly setting change data in the control device 1 or a change data creation program in the personal computer 35, and is connected and controlled by a communication line. By transmitting the data to the device 1, rewriting can be freely performed from outside the air conditioner.

The retry condition selecting means 37 reads the setting state, selects necessary judgment data from the retry condition judgment table 34, and sets it as retry judgment data 38.

Referring to FIG. 6, a description will be given of a flow chart of a process performed by the abnormality determining means 39 when an abnormality occurs in the air conditioner.

During the operation, the abnormality judging means 39 checks whether or not an abnormality has occurred in accordance with the retry condition data which can be constantly searched from the number of retries. If it is determined that an abnormality has occurred in the air conditioner, it is checked whether there is a setting of the number of retries. If there is a setting, the retry count required for updating the search data of the retry condition is updated by adding 1, and the retry is stopped. Thereafter, the above determination operation is repeated.

[0031] By the above method can <br/> provide an air conditioner that can change depending on the number of retries stop condition to retry stop.

Next, a second embodiment of the present invention will be described with reference to the drawings.

The control device 70 shown in FIG. 7 comprises a control device 71 for controlling the entire air conditioner, and a compressor speed control means 72 for controlling the speed of the compressor in accordance with a command from the control device 71.

For example, it is assumed that control is performed to limit the number of revolutions of the compressor as shown in FIG. 8 in order to prevent the compressor discharge pressure (hereinafter, referred to as Pd) from rising abnormally. This control is performed until Pd rises to the region of B.
The rotation speed is not limited, and when the rotation speed exceeds, the increase in the compressor rotation speed is prohibited. When the rotation speed further rises to the region C, the compressor rotation speed is forcibly reduced. If it further rises and reaches the area D, it is stopped.

The control means 71 includes the values of A, B, and C used until the stop, and a,
Even if the values of b and c are prepared in advance and the number of revolutions is limited by the above-described control, when the engine stops, the values of A, B and C which are the control determination values are further reduced. a,
b and c.

As described above, by lowering the control judgment value, a control device for an air conditioner which does not detect an abnormality due to the same factor, once the engine has stopped once due to an abnormality, is early realized. it can.

Although the judgment value has been changed in the above description, the same air conditioner can also be achieved by lowering the upper limit of the compressor rotation speed permitted by the air conditioner after once stopping abnormally with the judgment value unchanged. Control device can be realized.

As described above, according to the present invention, the means for changing the condition for stopping the retry in accordance with the number of retries is provided. Therefore, even if an abnormality occurs in the air conditioner, the air conditioner desired by the user can be obtained. forced operation, and an air conditioner to achieve the operation does not damage the air conditioner can be provided.

[0039]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an air conditioning system showing an embodiment of the present invention.

FIG. 2 is a functional block diagram of a control device according to the embodiment of the present invention.

FIG. 3 is a diagram showing main functions of a control unit and a data flow according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a process until determining retry condition data according to the embodiment of the present invention.

FIG. 5 is a structural diagram of a data table showing retry conditions according to the embodiment of the present invention.

FIG. 6 is a flowchart when a failure determination unit according to the embodiment of the present invention makes a determination.

FIG. 7 is a configuration diagram of a control device showing another embodiment of the present invention.

8 is a characteristic diagram showing control of the number of revolutions of the compressor by the control device shown in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control device of this invention 2 Outdoor unit 3 Indoor unit 4 Remote control switch 5 Communication line 6 Refrigerant piping 7 Personal computer

Continuing on the front page (72) Inventor Takashi Kato 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Air Conditioning Systems Division, Hitachi, Ltd. References JP-A-8-100944 (JP, A) JP-A-6-212641 (JP, A) JP-A-2-214499 (JP, A) JP-A-7-190509 (JP, A) 9-236336 (JP, A) JP-A-9-210478 (JP, A) JP-A-8-35718 (JP, A) JP-A-8-254362 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 11/02 102

Claims (3)

(57) [Claims] 1. A means for detecting a temperature and a pressure in an air conditioner when the air conditioner is operating, a means for detecting a current value of a compressor, and an operation state of a protection device of the air conditioner. means for detecting, means for determining abnormality of the air conditioner by the detection, in an air conditioner having a <br/> retry chair Ru means over extent to abnormal stop at its discretion, the air
The number of retries and the number of retries for each control type
Multiple data patterns consisting of trie detection conditions
Providing a data table for
The row is selected from the data patterns in the data table.
Retry stop based on detected retry count and detection conditions
An air conditioner characterized by shut-off control . 2. The method according to claim 1, wherein the retry is detected.
Conditions are difficult to detect gradually when the detection conditions are kept constant.
To make the condition easier to detect
Air conditioning characterized by having a data pattern of
Machine. 3. The data table according to claim 1, wherein
Is rewritten from outside the air conditioner via a communication line.
An air conditioner characterized by being made possible.