JPH08303836A - Control method for heat pump type air-conditioner - Google Patents

Abstract

PURPOSE: To provide a control method for a heat bump type air-conditioner to produce an accurate set room temperature. CONSTITUTION: Set temperatures I and J at which a compressor is set OFF-state if a compressor operation frequency is a minimum frequency are set to a value near a room temperature set value Ts than set temperatures B and D at which the compressor is set OFF if the compressor operation frequency is other than a minimum frequency. When the compressor is operated at a minimum frequency, the compressor is set OFF even if temperature does not attain a value at which the compressor is set OFF when it is other than a minimum frequency. Further, when temperature attains set temperature F and H at which an operation mode under the stop of the compressor is switched, a time measuring means is started. When the set temperatures are continuously satisfied for a given time, an operation mode is switched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner control method.

[0002]

2. Description of the Related Art In recent years, there has been a demand for improvement in the comfort of air conditioners, and there is a control method for accurately obtaining a set room temperature by operating and stopping a compressor, and automatically switching between cooling and heating operations. It is popular.

Conventionally, as a cooling / heating automatic switching method for this type of air conditioner, a control method as shown in FIGS. 6 and 7 has been generally used. Hereinafter, the configuration will be described as (conventional example 1) with reference to FIGS. 6 and 7.

As shown in FIG. 7, at the start of operation of the heat pump type air conditioner, if the room temperature is higher than the room temperature set value Ts, the cooling operation mode is selected, and if the room temperature is lower than the room temperature set value Ts, the heating operation mode is selected. To be selected.

When the cooling operation mode is selected and the room temperature at the start of operation is temperature A1 or higher as shown in FIG. 6, the compressor is turned on to start the cooling operation. Is OFF, that is, kept stopped.

By continuing the cooling operation, the room temperature gradually drops, and when the temperature reaches the temperature B1, the compressor turns off and stops.

When the room temperature gradually rises and reaches the temperature A1 by continuing to stop the compressor, the compressor is turned on again.
N. When the room temperature falls and reaches the temperature C1 even when the compressor is stopped, the mode is automatically switched to the heating operation mode and simultaneously the compressor is turned on to start the heating operation.

When the heating operation mode is selected and the room temperature at the start of operation is the temperature C1 or lower, the compressor is turned on to start the heating operation, but when the temperature is C1 or higher, the compressor is turned off. That is, it is kept stopped.

By continuing the heating operation, the room temperature gradually rises, and when the temperature reaches D1, the compressor is turned off and stops.

When the room temperature is gradually lowered to reach the temperature C1 by continuing to stop the compressor, the compressor is turned on again.
N. When the room temperature rises and reaches the temperature A1 even when the compressor is stopped, the mode is automatically switched to the cooling operation mode and simultaneously the compressor is turned on to start the cooling operation.

After the compressor is stopped, the temperature A1 is set higher than the temperature D1 and the temperature C1 is set lower than the temperature B1 so that the operation mode does not change frequently.

Further, in Japanese Patent Laid-Open No. 3-28649, a blowing operation range of a predetermined width is provided on the high temperature side and the low temperature side of a room temperature set value.
A control method has been proposed in which a cooling operation area is set on the high temperature side of the blow operation area and a heating operation area is set on the low temperature side to prevent frequent repetition of cooling and heating.

The configuration will be described below as (conventional example 2) with reference to FIGS. 8 and 9.

As shown in FIG. 9, a blowing operation region having a predetermined temperature range is set on each of the high temperature side and the low temperature side of the room temperature set value Ts, and the cooling operation region is set on the high temperature side of this blowing operation region and the heating operation is set on the low temperature side. Each area was set.

Then, the operation mode is determined depending on whether the room temperature at the start of operation of the heat pump type air conditioner falls within the blowing operation area, the cooling operation area, or the heating operation area.

For example, when the cooling operation mode is decided and the room temperature is higher than the temperature A2 as shown in FIG. 8, the compressor is turned on, and when the room temperature is lower than A2, the compressor is turned off, that is, stopped. To be kept. When the room temperature is lowered and reaches the temperature B2 by continuing the cooling operation, the compressor is turned off.
It became FF and was supposed to stop.

Further, when the room temperature rises to reach the temperature A2 by continuing the stop of the compressor, the compressor is turned off again.
Although it becomes N, the room temperature falls and the temperature E2
When it reached to, the operation mode was switched from the cooling operation to the blowing operation.

In the blower operation mode, the compressor is not operated and only the indoor blower is operated.
If the room temperature rises and reaches the temperature H2 during the air blowing operation, the cooling operation mode is switched to and the cooling operation is started at the same time as the compressor is turned on. The machine was turned on and the heating operation was started.

Further, when the operation is started, the heating operation mode is determined, and if the room temperature is equal to or lower than the temperature C2, the compressor is turned on,
When the room temperature is equal to or higher than the temperature C2, the compressor is turned off, that is, is kept stopped, and when the room temperature rises and reaches the temperature D2 by continuing the heating operation, the compressor is turned off and stopped. It was

Further, when the room temperature is lowered to reach the temperature C2 by continuing the stop of the compressor, the compressor is turned on again.
Although it is N, the room temperature rises and the temperature G2
When it reached, the operation mode was switched from heating operation to blow operation.

The above set temperatures will be supplementarily described. The temperature G2 is higher than the temperature D2, and the temperature H2 is higher than the temperature D2.
Was set to a higher temperature side, the temperature E2 was set to a lower temperature side than the temperature B2, and the temperature F2 was set to a lower temperature side.

[0022]

In such a conventional heat pump type air conditioner control method, in (Conventional example 1), after the operation of the compressor is stopped, the change in the blown air temperature of the adjacent air conditioner, When the room temperature changes suddenly due to disturbances such as opening and closing of windows or changes in outdoor temperature, or when an incorrect output value is momentarily sent from the room temperature detection means due to the influence of electrical noise, the operation mode There is a problem in that the air conditioner is frequently switched from the cooling operation to the heating operation and vice versa.

In (Conventional Example 2), in order to solve the former problem, an air blowing operation is provided between the cooling operation and the heating operation. For example, the room temperature is lowered to the temperature B2 by continuing the cooling operation. When the temperature reaches the temperature E2, the compressor is turned off. When the temperature reaches the temperature E2, the air blowing operation starts. However, even if the room temperature rises once, the cooling operation is not restarted until the temperature H2 is higher than the temperature A2. On the contrary, once the heating operation is changed to the air blowing operation, the heating operation is not restarted until the temperature F2 lower than the temperature C2 is reached.

When the cooling operation is continued (conventional example 1), it is between the room temperature set temperature Ts and the temperature B1 at which the compressor is turned off, and (conventional example 2) is between the room temperature set value Ts and temperature B2. In the above, when the compressor is operating at the lowest frequency or a relatively low frequency close to it, even though the room temperature is lower than the room temperature set value Ts, the temperature does not reach the temperature B1 or B2, so the compressor is turned off. Similarly, during the heating operation, the room temperature is between the room temperature set value Ts and the temperature D1 or D2.
However, there was a problem that the compressor did not turn off easily even though it was above the limit.

The present invention is to solve the above-mentioned problems. When the cooling operation is continued and the temperature is lower than the room temperature set value, or the heating operation is continued and the room temperature is exceeded, the compressor has a low frequency. Even when operating at
A first object of the present invention is to provide a control method of a heat pump type air conditioner that performs FF and obtains an accurate set room temperature.

A second object is that the cooling operation is not frequently switched from the cooling operation to the heating operation or vice versa due to a sudden change in the room temperature or an erroneous output from the room temperature detecting means, and the fluctuation range of the room temperature is reduced. This is to enable more accurate room temperature control.

[0027]

In order to achieve the first object of the method for controlling a heat pump type air conditioner of the present invention, the first means is an outdoor unit provided with a compressor with variable compression capacity and a four-way valve. Machine, an indoor unit having a blowout air temperature detecting means near the outlet, and a room temperature detecting means, and the compressor is turned off when the compressor operating frequency determined by the room temperature and the blowout air temperature is the lowest frequency. The set temperature is set closer to the room temperature set value than the set temperature that is turned off when the frequency is other than the minimum frequency.

Further, in order to achieve the second object, the second
Means has a time measuring means in the control device, the duration is measured when the set temperature for switching the operation mode is reached,
When the set temperature is continuously satisfied for a predetermined time, the operation mode is switched.

[0029]

According to the present invention, by the structure of the first means described above, when the compressor is operating at the lowest frequency, the compressor can be turned off earlier than the temperature at which the compressor should be stopped.

Further, due to the constitution of the second means, it is frequently affected by a sudden change in the room temperature or a momentary erroneous output value sent from the room temperature detecting means, so that the air conditioner is frequently switched from the cooling operation to the heating operation or vice versa. It is possible to prevent replacement.

[0031]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in FIG. 3, the room temperature is measured by the room temperature detecting means 1 provided in the room, and the blown air temperature is measured by the blown air temperature detecting means 3 provided near the air outlet of the indoor unit 2 to control the controller. At 4, the operating mode or ON / OFF of the compressor 5 and the operating frequency are determined from the room temperature and the blown air temperature, and the compressor 5 installed in the four-way valve 6 or the outdoor unit 7 is controlled.

Then, as shown in FIG. 2, the room temperature set value T
Predetermined temperature range tcde on the high temperature side and low temperature side of s
The blower operation range of g and thdeg (only the indoor blower 8 is operated) is set, and the cooling operation range is set on the high temperature side and the heating operation range is set on the low temperature side of this blower operation range.

Then, the operation mode is determined depending on whether the room temperature at the start of operation of the heat pump type air conditioner falls within the blowing operation area, the cooling operation area or the heating operation area, and the four-way valve 6 is switched. .

With the above configuration, for example, the cooling operation mode is determined, and the room temperature is t3c from the room temperature set value Ts shown in FIG.
If the temperature is higher than the deg high temperature A, the compressor 5 is turned on to start the cooling operation, but if the room temperature is equal to or lower than the temperature A, the compressor 5 is turned off, that is, kept stopped, and only the indoor blower 8 is operated. .

If the room temperature rises above the temperature A by continuing to stop the compressor 5, the compressor 5
Is turned on to restart the cooling operation. However, the compressor 5 is kept stopped unless the room temperature rises above the temperature A.

It is assumed that the room temperature rises and exceeds the temperature A, and the operation is started in the cooling operation mode. Then, the room temperature is lowered by continuing the cooling operation, and the room temperature set value Ts
When the temperature falls below the temperature B which is lower than t2cdeg, the compressor 5 becomes O
FF. However, the room temperature is t1cd from the room temperature set value Ts.
When the temperature is below the low temperature I (t1c <t2c), the compressor 5 is operating at the lowest frequency, or when the room temperature is in the range higher than the temperature B and lower than the temperature I, the compressor 5
If the operating frequency of is the lowest frequency, the compressor 5 is turned off even if the temperature B has not been reached.

At the start of the operation, the heating operation mode is determined, and the temperature C at which the room temperature is lower than the room temperature set value Ts by t3hdeg.
If it is lower, the compressor 5 is turned on to start the heating operation, and if the room temperature is equal to or higher than the temperature C, the compressor 5 is turned off, that is, kept stopped, and only the indoor blower 8 is operated.

If the room temperature falls and becomes lower than the temperature C by continuing to stop the compressor 5, the compressor 5
Is turned on and the heating operation is restarted. However, the compressor 5 is kept stopped unless the room temperature falls below the temperature C.

Now, assuming that the room temperature is lowered and exceeds the temperature C,
It is assumed that the operation is started in the heating operation mode. Then, by continuing the heating operation, the room temperature rises and the room temperature set value Ts
Above a temperature D which is higher than t2hdeg, the compressor 5 becomes O
FF. However, the room temperature is t1hd from the room temperature set value Ts.
When the temperature exceeds the high temperature J (t1h <t2h), the compressor 5 is operating at the lowest frequency, or when the room temperature is lower than the temperature D and higher than the temperature J, the compressor 5
If the operating frequency of is the lowest frequency, the compressor 5 is turned off even if the temperature D has not been reached.

As described above, according to the control method for the heat pump type air conditioner of the first embodiment of the present invention, when the temperature is below the room temperature set value during the cooling operation, or when it is above the room temperature set value during the heating operation. The set temperature at which the compressor is turned off can be selected according to the state of the operating frequency of the compressor 5, so that wasteful operation of the compressor 5 can be eliminated and the set room temperature can be obtained more accurately.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS. 2 and 4 to 5.

Regarding the same parts as in the first embodiment,
The same reference numerals are given and detailed description is omitted.

As shown in the figure, while the compressor 5 is stopped, the temperature F (tch) at which the room temperature is tchdeg lower than the room temperature set value Ts.
<T2c) or less than room temperature set value Ts
A time measuring unit 9 is provided which starts time measurement when the temperature exceeds a high temperature H (thc> t2h) and measures the duration of time below the temperature F or the time above temperature H.

With the above configuration, when the compressor 5 is stopped in the cooling operation mode but the room temperature rises and becomes higher than the temperature A by continuing the stop of the compressor 5,
The compressor 5 is turned on and the cooling operation is restarted. However, the compressor 5 is kept stopped unless the room temperature rises above the temperature A. When the room temperature falls and falls below the temperature F despite the stop, the time measuring means 9 is started, and when the state where the room temperature is lower than the temperature F continues for a predetermined time, the operation mode is automatically changed from the cooling operation to the heating operation. Transition. That is, the four-way valve 6 is switched and the compressor 5 is turned on.

In the heating operation mode, when the compressor 5 is stopped, if the room temperature is lowered and becomes lower than the temperature C by continuing the stop of the compressor 5, the compressor 5 is turned on and heating is performed. Restart the operation. However, the compressor 5 is kept stopped unless the room temperature falls below the temperature C. When the room temperature rises and exceeds the temperature H despite the stop, the time measuring means 9 is started, and when the state where the room temperature is higher than the temperature H continues for a predetermined time, the operation mode is automatically changed from the heating operation to the cooling operation. Transition. That is, the four-way valve 6 is switched and the compressor 5 is turned on.

At the start of the operation of this heat pump type air conditioner, if the cooling operation mode or the heating operation mode is selected, the operation mode after that is cooling or heating, but at the start of the operation, the room temperature is the room temperature set value. On the other hand, FIG.
In the range of the predetermined temperature range tcdeg or thdeg in the above, the blower operation mode is selected, and only the indoor blower 8 is operated with the compressor 5 kept stopped.

When the room temperature falls and falls below the temperature F while continuing the blow operation mode, the time measuring means 9 is started, and when the room temperature is lower than the temperature F for a predetermined time, it automatically operates. The mode is changed from the blowing operation mode to the heating operation mode, and the compressor 5 is turned on.
On the contrary, when the room temperature rises and exceeds the temperature H, the time measuring means 9 is started, and when the state where the room temperature is higher than the temperature H continues for a predetermined time, the operation mode is automatically changed from the blow operation mode to the cooling operation mode. , Turn on the compressor 5. It should be noted that the switching of these operation modes may involve switching of the four-way valve 6.

As described above, according to the control method for the heat pump type air conditioner of the second embodiment of the present invention, even if the room temperature reaches the set temperature at which the operation mode is automatically switched, that state must be continued for a predetermined time. In this case, the operation mode does not switch, so there is no frequent switching from cooling operation to heating operation or vice versa under the influence of a sudden change in room temperature, and an erroneous output value from the room temperature detection means due to electrical noise etc. Even if something is sent, the operation mode can be continued in an appropriate operation mode without changing the operation mode.

[0050]

As is apparent from the above embodiments, according to the present invention, the temperature at which the compressor is turned off is set when the operating frequency of the compressor is the minimum frequency, and the OF temperature is set when the operating frequency is other than the minimum frequency.
Since it was set near the room temperature set value rather than the set temperature for F,
It is possible to provide a control method of a heat pump type air conditioner that can obtain a set room temperature more accurately while eliminating wasteful operation of the compressor.

In addition to the set temperature for switching the operation mode, a time condition is added in which the operation mode is not switched unless the set temperature is continuously satisfied for a predetermined time. It is possible to provide a control method of a heat pump type air conditioner that can prevent a frequent switching of operation modes due to noise and can more accurately obtain a set room temperature.

[Brief description of drawings]

FIG. 1 shows a room temperature, an operation mode, and O of a compressor according to a control method of a heat pump type air conditioner of a first embodiment of the present invention.
Conceptual diagram showing the relationship between N and OFF

FIG. 2 is a conceptual diagram showing a relationship between a room temperature and an operation mode for selecting an operation mode at the start of operation by the control method of the heat pump type air conditioner of the first embodiment and the second embodiment.

FIG. 3 is a schematic diagram showing a configuration of a heat pump type air conditioner of the first embodiment.

FIG. 4 is a room temperature and an operation mode and a compressor ON / O by the control method of the heat pump type air conditioner of the second embodiment.
Conceptual diagram showing the relationship with FF

FIG. 5 is a schematic diagram showing a configuration of the heat pump type air conditioner.

FIG. 6 is a conceptual diagram showing a relationship between a room temperature, an operation mode, and ON / OFF of a compressor according to a conventional heat pump type air conditioner control method.

FIG. 7 is a conceptual diagram showing the relationship between the room temperature and the operation mode selected when the operation is started.

FIG. 8: Same room temperature, operation mode, and compressor ON / OF
Conceptual diagram showing the relationship with F

FIG. 9 is a conceptual diagram showing the relationship between the room temperature and the operation mode selected when the operation is started.

[Explanation of symbols]

 1 Room temperature detection means 2 Indoor unit 3 Blow-off air temperature detection means 4 Control device 5 Compressor 6 Four-way valve 7 Outdoor unit 9 Time measurement means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Fukuda Minoru Fukuda 6-2 61, Imafuku Nishi, Joto-ku, Osaka City, Osaka Prefecture Matsushita Seiko Co., Ltd. (72) Tatsuya Hori, 6-chome, Imafuku Nishi, Joto-ku, Osaka No. 2 61 Matsushita Seiko Co., Ltd.

Claims (2)

[Claims] 1. A compressor having a variable compression capacity, an outdoor unit provided with a four-way valve, an indoor unit provided with blown air temperature detecting means in the vicinity of a blowout port, and a room temperature detecting means. Control of a heat pump type air conditioner in which the set temperature for turning off the compressor when the determined compressor operating frequency is the lowest frequency is set near the room temperature set value rather than the set temperature for turning off when the frequency is not the lowest frequency Method. 2. The control device is provided with a time measuring means, the duration is measured when a set temperature for switching the operation mode is reached, and the operation mode is switched when the set temperature is continuously satisfied for a predetermined time. 1. The method for controlling the heat pump type air conditioner according to 1.