JP2002340384A - Control method for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for an air conditioner, in which comfort in a room is increased without causing the occupant to feel cool air, even when the room temperature is very low. SOLUTION: In a normal operation, when temperature 1b in an air-volume control is lower than 30 deg.C at the time of increase of indoor heat-exchanger temperature, the volume of air of the heat exchanger, that is, rotational speed 2b of a fan motor is controlled at ultralow speed. When the temperature 1b is 30-37 deg.C, the speed 2b is controlled at intermediate speed or below, while it is 40 deg.C or higher, the speed 2b is controlled at most at the high speed. When an air-volume control temperature 3b at the time of drop of the temperature of an indoor heat-exchanger is 34 deg.C or higher, the rotational speed 2b is controlled at most at the high speed, and when the temperature is 32-34 deg.C, the speed 2b is controlled at the intermediate speed or below. When the temperature is 28-32 deg.C, the speed is controlled at the low speed, and when the temperature is 28 deg.C or below, the speed is controlled at the ultralow speed or below. Further, when the indoor temperature is at about 10 deg.C or below, 20 min of 'cold start' is conducted, in which the temperature 1b is set higher than that in the normal operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner that does not allow a sense of blowing of cool air at the beginning of a heating operation even when the room temperature is low.

[0002]

2. Description of the Related Art FIG. 5 is a schematic diagram for explaining the operation of a conventional control method for restricting blowing of cold air during a heating operation of an air conditioner. In this conventional example, the temperature of the air blown out of the indoor heat exchanger during the heating operation is detected, and when the temperature is equal to or lower than a predetermined temperature, that is, the airflow limit temperature, the rotation speed of the fan motor of the indoor heat exchanger is controlled. In addition, the air volume of the indoor heat exchanger is limited to a predetermined air volume or less to prevent blowing of cool air. Specifically, the air flow limit temperature 51 when the temperature of the indoor heat exchanger rises is 30 ° C.
If it is less than the rotation speed 52 of the fan motor of the indoor heat exchanger
Is limited to an ultra-low speed or lower, below 30 ° C. to less than 37 ° C., below a low speed, from 37 ° C. to less than 40 ° C. to a medium speed or less, and above 40 ° C. to a high speed or less. Further, when the air flow limit temperature 53 when the temperature of the indoor heat exchanger falls is 34 ° C. or more, the rotation speed 52 of the fan motor is reduced to a high speed or less.
When the temperature is less than 4 ° C and 32 ° C or more, the speed is lower than the medium speed,
When the temperature is not lower than 28 ° C., the speed is limited to a low speed or less. That is, the temperature of the indoor heat exchanger is given a hysteresis characteristic in a rising direction and a descending direction, and the air volume of the indoor heat exchanger is limited stepwise by the temperature of the indoor heat exchanger. Therefore, the low-temperature wind does not blow out strongly from the air conditioner, and the unpleasant sensation due to the decrease in the sensible temperature is alleviated. However, in the above conventional example, since the air volume of the indoor heat exchanger is limited by the temperature of the fixed indoor heat exchanger regardless of the indoor temperature, when the indoor temperature is extremely low, some people may not be air conditioned. There was a risk of feeling discomfort due to blowing from the machine.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method of controlling an air conditioner in which comfort is improved without feeling cold air even when the room temperature is extremely low. The purpose is to:

[0004]

According to the present invention, there is provided an indoor temperature detecting means for detecting an indoor temperature.
Heat exchanger temperature detecting means for detecting the temperature of the indoor heat exchanger, and rotational speed control means for controlling the rotational speed of the blower based on the temperatures detected by the indoor temperature detecting means and the heat exchanger temperature detecting means. A method of controlling the air conditioner to limit the number of rotations of the blower to a predetermined number of rotations or less when the temperature of the indoor heat exchanger is equal to or lower than a predetermined temperature, thereby preventing blowing of cool air; When the room temperature at the time is equal to or lower than the predetermined temperature, the predetermined temperature is set to be higher than that during the normal operation for a predetermined time.

[0005] The predetermined temperature is changed stepwise or continuously according to the room temperature.

The predetermined time is changed stepwise or continuously according to the room temperature.

[0007] The rotation speed of the blower is continuously limited according to the predetermined temperature.

[0008] A hysteresis characteristic is provided between the predetermined temperature and the rotation speed of the blower to be restricted accordingly.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B are conceptual diagrams for explaining an operation of an air conditioner control method according to an embodiment of the present invention, in which FIG. 1A shows a cold start and FIG. 1B shows a normal operation. During normal operation (see FIG. 1 (B)), the rotational speed of the fan motor of the indoor heat exchanger is changed stepwise with hysteresis at the same temperature of the indoor heat exchanger as in the above-described conventional example. Limit the amount of air blown from the heat exchanger. That is, when the airflow limit temperature 1b when the temperature of the indoor heat exchanger rises is less than 30 ° C., the airflow of the indoor heat exchanger, that is, the rotation speed 2b of the fan motor is set to an extremely low speed. , 37 ° C or higher 4
When the temperature is lower than 0 ° C., the speed is limited to a medium speed or lower. In addition, when the air flow limit temperature 3b when the temperature of the indoor heat exchanger falls is 34 ° C. or higher, the rotation speed 2b of the fan motor is set to a high speed or lower, and when the temperature is lower than 34 ° C. When the temperature is 28 ° C. or more, the speed is limited to a low speed or less, and when the temperature is less than 28 ° C., the speed is limited to a very low speed or less.

On the other hand, when the room temperature is as low as about 10 ° C. or less, a cold start (see FIG. 1A) in which the above-mentioned air flow limit temperature is set higher than in the normal state is performed for about 20 minutes, and thereafter, the normal operation is started. Specifically, when the air flow limit temperature 1a when the temperature of the indoor heat exchanger rises is less than 35 ° C., the air flow of the indoor heat exchanger, that is, the rotation speed 2a of the fan motor is set to an ultra-low speed or less, and 35 ° C. or more to 42 ° C. When the temperature is lower than 42 ° C. and lower than 45 ° C., the speed is limited to a medium speed or lower. Further, when the air flow limit temperature 3a when the temperature of the indoor heat exchanger falls is 39 ° C. or more, the rotation speed 2a of the fan motor is reduced to a high speed or less.
When the temperature is less than 9 ° C and 37 ° C or more, the speed is lower than the medium speed.
When the temperature is not lower than 33 ° C., the speed is limited to ultra-low speed or lower. As a result, when the room temperature is extremely low, the blowing of the cool air is more restricted than usual, and the perceived temperature is improved. If the temperature for the cold start is too high, the heating effect is delayed due to the restriction of the air volume of the indoor heat exchanger. Optimally, it should be less than about. Similarly, the operation time after the cold start is too long, the effect of the heating is delayed, and if it is too short, the perceived temperature decreases.

FIG. 2 is a block diagram of a main part of a configuration of an embodiment of a method for controlling an air conditioner according to the present invention. When the operation mode of the air conditioner set by the operation mode setting unit 26 composed of a remote controller or the like is a heating operation, M is set according to the setting of the air volume setting unit 25 composed of a remote controller or the like.
The fan motor drive unit 2 is controlled by the control unit 22 including a PU or the like.
7 sets the rotation speed of the fan motor and sets the fan motor 2
8 is rotated to blow warm air from the indoor heat exchanger to perform heating. At this time, the control unit 22 having the function of the rotation speed control unit controls the air volume set by the air volume setting unit 25 in accordance with the temperature of the indoor heat exchanger detected by the heat exchanger temperature detecting unit 21 composed of a thermistor or the like. However, the rotation speed of the fan motor is limited as described above (see FIG. 1B). Further, in the embodiment according to the present invention, the room temperature is detected by a room temperature detecting unit 23 as a room temperature detecting unit such as a thermistor, and when the detected room temperature is 10 ° C. or less, the control unit 22 as a rotational speed controlling unit is used. The operation shown in FIG. 1A is performed as a cold start. The cold start operation is performed for 20 minutes by the control unit 22 with reference to the timer 24 as time measuring means, and thereafter, the normal operation (FIG. 1)
Enter (B)).

FIG. 3 is a flow chart of an air volume limit temperature setting operation in one embodiment of the air conditioner control method according to the present invention. When the operation of the control method starts in step S0, it is checked in step S1 whether the operation mode is the heating operation. When the operation mode is the heating operation, the process proceeds to step S2.
In step S2, the room temperature is checked. If the temperature is not lower than 10 ° C., the process jumps to step S6 to set the air flow limit temperature during normal operation. On the other hand, if the room temperature is 10 ° C. or less in step S2, the timer is set to 20 in step S3.
The temperature is set to minutes, and in step S4, the air flow limit temperature at the time of cold start is set. Next, at step S5, an interrupt is waited for the elapse of 20 minutes from the timer, and after the elapse of 20 minutes, the process proceeds to step S6. In step S6, the air flow limit temperature during normal operation is set, and in step S7, the air flow setting operation in the present control method ends.

As another embodiment of the control method of the air conditioner according to the present invention, the air flow limit temperature at the time of cold start can be changed stepwise or continuously according to the room temperature. For example, when the room temperature is lower than 15 ° C., every time the temperature drops by 1 ° C. from 15 ° C., the air flow limit temperature at the cold start is increased by 1 ° C.
Raise one by one. Then, the air flow limit temperature at the time of cold start when the room temperature is 10 ° C. is as described above (FIG. 1).
It becomes the same as (A)), and gradually becomes higher in the meantime. As a result, a decrease in the sensible temperature can be prevented in accordance with the room temperature.

In another embodiment of the air conditioner control method according to the present invention, the operation time at the time of cold start can be changed stepwise or continuously according to the room temperature. For example, when the room temperature is lower than 15 ° C, 1
Each time the temperature drops by 1 ° C. from 5 ° C., the time counted by the timer is increased from 15 minutes to 1 minute. Then, the operation time at the time of cold start is the same as above (FIG. 1 (A)) at 10 ° C.
It is 0 minutes, during which time it gets longer. As a result, it is possible to precisely prevent the drop in the perceived temperature corresponding to the room temperature.

FIG. 4 is a conceptual diagram for explaining an operation at the time of a cold start in another embodiment of the control method of the air conditioner according to the present invention. Corresponding to the temperature 41 of the indoor heat exchanger, the rotation speed 42 of the fan motor of the indoor heat exchanger changes the air flow restriction temperature curve 43 when the temperature 41 of the indoor heat exchanger rises and the air flow restriction temperature curve when it falls. According to 44, a hysteresis characteristic is provided between the low speed and the high speed to continuously limit. For example, when the temperature 41 of the indoor heat exchanger rises, according to the air volume restriction curve 43,
When the temperature 41 of the indoor heat exchanger is approximately 35 ° C. or less, the rotation speed 42 of the fan motor is limited to a low speed or less, and
When the temperature is higher than 5 ° C., the speed is set to be lower than the high speed. When the temperature 41 of the indoor heat exchanger falls, the temperature 41 of the indoor heat exchanger is approximately 39 ° C. or higher and the rotation speed of the fan motor is lower than the high speed, and when the temperature 41 of the indoor heat exchanger is approximately 33 ° C. or lower. The speed is limited continuously below the low speed. Thereby, it is possible to finely prevent the cold air due to the temperature of the indoor heat exchanger.

[0016]

As described above, the indoor temperature detecting means for detecting the indoor temperature, the heat exchanger temperature detecting means for detecting the temperature of the indoor heat exchanger, the indoor temperature detecting means and the temperature of the heat exchanger. A rotation speed control unit that controls the rotation speed of the blower based on the temperature detected by the detection unit, the rotation speed of the blower is set to a predetermined rotation speed or less when the temperature of the indoor heat exchanger is equal to or lower than a predetermined temperature. In the control method of an air conditioner, which restricts and prevents blowing of cold air, when the indoor temperature at the start of the heating operation is equal to or lower than a predetermined temperature, the predetermined temperature is set higher than that during the normal operation for a predetermined time. By doing so, even when the room temperature is extremely low, the blowing that is perceived as cool air when starting the heating operation with the air conditioner is limited, and a comfortable heating operation can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram for explaining an operation of an air conditioner control method according to an embodiment of the present invention, in which (A) shows a cold start and (B) shows a normal operation.

FIG. 2 is a main part block diagram of a configuration in an embodiment of a control method of an air conditioner according to the present invention.

FIG. 3 is a flowchart of an air volume limit temperature setting operation in one embodiment of the control method of the air conditioner according to the present invention.

FIG. 4 is a conceptual diagram for explaining an operation at the time of a cold start in another embodiment of the control method of the air conditioner according to the present invention.

FIG. 5 is a schematic diagram for explaining the operation of a conventional control method for restricting the blowing of cool air during a heating operation of the air conditioner.

[Explanation of symbols]

 1a, 1b Airflow limit temperature when temperature of indoor heat exchanger rises 2a, 2b Rotation speed of fan motor 3a, 3b Airflow limit temperature when temperature of indoor heat exchanger falls 21 Heat exchanger temperature detection unit 22 Control unit 23 Indoor Temperature detection unit 24 Timer 25 Air volume setting unit 26 Operation mode setting unit 27 Fan motor drive unit 28 Fan motor 41 Indoor heat exchanger temperature 42 Fan motor rotation speed 43 Air volume restriction temperature curve when temperature of indoor heat exchanger rises 44 Indoor Air flow limit temperature curve when heat exchanger temperature drops 51 Air flow limit temperature when indoor heat exchanger temperature rises 52 Rotation speed of fan motor 53 Air flow limit temperature when indoor heat exchanger temperature drops

Claims (5)

[Claims] 1. An indoor temperature detecting means for detecting an indoor temperature, a heat exchanger temperature detecting means for detecting a temperature of an indoor heat exchanger, and a temperature detected by the indoor temperature detecting means and the heat exchanger temperature detecting means. A rotation speed control means for controlling the rotation speed of the blower based on the temperature of the indoor heat exchanger is equal to or lower than a predetermined temperature. In the air conditioner control method, when the room temperature at the start of the heating operation is equal to or lower than a predetermined temperature, the predetermined temperature is set higher than that in the normal operation for a predetermined time. Machine control method. 2. The method according to claim 1, wherein the predetermined temperature is changed stepwise or continuously according to the room temperature. 3. The method according to claim 1, wherein the predetermined time is changed stepwise or continuously according to the room temperature. 4. The control method for an air conditioner according to claim 1, wherein the number of revolutions of the blower is continuously limited according to the predetermined temperature. 5. The control method for an air conditioner according to claim 4, wherein a hysteresis characteristic is provided between the predetermined temperature and the rotation speed of the blower restricted according to the predetermined temperature.