JP3070974B2 - Control device for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for air conditioners such as air conditioners, hot air heaters, dehumidifiers, humidifiers, etc.
The present invention relates to a control device for an air conditioner that compares a detected value such as humidity with a set value, and controls an air conditioning output such as cooling, heating, dehumidification, or humidification based on the comparison result.

[0002]

2. Description of the Related Art Conventionally, for example, in a hot air heater,
As disclosed in Japanese Unexamined Patent Publication No. 3-315857, at the beginning of the operation, the combustion amount in the burner is controlled so as to be maximized so that the room temperature rises quickly, and after the room temperature approaches the set temperature, the room temperature is changed to the room temperature. A control device is provided which controls the amount of combustion in accordance with the deviation from the set temperature so that the room temperature can be maintained near the set temperature.

[0003]

In the above-described control apparatus for a hot air heater, when controlling the combustion amount in accordance with the deviation between the set temperature and the room temperature, when the heating operation is started shortly or when ventilation is performed. Since the amount of change in the heating output with respect to the same deviation is the same in the unstable period of the room temperature as in the invasion of outside air and the stable room temperature, if this change is set to a small value, the room temperature unstable period (particularly, the heating operation At the beginning), the overshoot of the room temperature with respect to the set temperature was small, and there was a concern that radiation from the wall would make the customer feel cold. In addition, if the change amount is set to a large value, the overshoot of the room temperature during the stable period of the room temperature becomes large. This overshoot not only gives the customer discomfort, but also increases the air volume of the hot air fan with the change in the combustion amount. Increase or decrease,
There has been a problem that the increase or decrease of the air volume is annoying.

The present invention has been made in view of the above-mentioned facts, and has an object to pay attention to the stability of a detected value and to perform a comfortable air-conditioning operation in both a stable period and an unstable period. And

[0005]

SUMMARY OF THE INVENTION According to the present invention, a detected value of temperature, humidity, etc. is compared with a set value, and an air conditioning output such as cooling, heating, dehumidification is controlled based on the comparison result. The stability of the value is determined. If the stability is low, the deviation between the detected value and the set value, and / or the amount of change in the air conditioning output with respect to the range of change in the detected value is increased. If the stability is high, the detected value is set. It is configured to reduce the amount of change in the air conditioning output with respect to the value deviation and / or the change width of the detected value.

Further, in the present invention, a detected value such as temperature and humidity is compared with a set value, and cooling and cooling are performed based on the comparison result.
In the control of the air conditioning output such as heating and dehumidification, the stability of the detected value is determined.When the stability is low, the air conditioning output is controlled so that the detected value exceeds the set value, and when the stability is high, the detection is performed. The air-conditioning output is controlled so that the value is substantially equal to the set value.

[0007]

In the control device for an air conditioner according to claim 1,
If it is determined that the stability of the detected values such as temperature and humidity is low,
The difference between the detected value and the set value and / or the amount of change in the air conditioning output with respect to the change width of the detected value increases. Therefore, shortly after the start of operation, the detected value exceeds the set value, and the influence of radiation or the like due to this overshoot can be reduced. If it is determined that the stability of the detection value is high,
Since the amount of change in the air conditioning output with respect to the above-described deviation and the change width is small, a stable air conditioning output can be obtained while maintaining the detection value close to the set value. In addition, since the amount of change in the air-conditioning output increases during an unstable period of ventilation or the like, the air-conditioning output is adjusted so that the detected value does not greatly deviate from the set value.

In the control device for an air conditioner according to the second aspect, the air conditioning output is adjusted to a large value during the unstable period.
In the stable period, the air conditioning output is adjusted to a small value, so that the comfortable air conditioning operation is performed in the same manner as in the first aspect.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 4 shows a hot-air heater 1 to which the present invention is applied. A hot-air fan 15 is provided on the back of the hot-air heater 1 having a built-in burner 2, and a hot-air discharger is provided on the front. An outlet 4 is provided, and an operation panel 5 is provided on the upper surface on the front side.

FIG. 1 shows an example of a control device 6 of the hot air heater 1, in which an operation switch 7, a temperature setting switch 8, and a room temperature sensor 9 such as a thermistor include an A / D converter and a nonvolatile memory. It is connected to an input side of a microcomputer (hereinafter, referred to as a microcomputer) 10 having a built-in (EEPROM). An electric heater 11, a spark plug 12, a fuel pump 13, a burner fan 14, and a hot air fan 15 are connected to the output side of the microcomputer 10. 16
Denotes a rotation speed detector of the burner fan 14, and a rotation speed signal of the rotation speed detector 16 is input to the microcomputer 10.

When the operation switch 7 is turned on, the microcomputer 10 performs the following combustion control based on a combustion program (see FIGS. 2 and 3).

First, the electric heater 11 is energized, and the burner 2 is turned on.
Preheat the vaporizer. When the preheating of the burner 2 is completed, the ignition plug 12 and the burner fan 14 are operated to pre-purge the burner 2, and then the fuel pump 13 and the hot air fan 15 are operated to start combustion and burn indoor air. It is heated by a gas and discharged as warm air from the warm air outlet 4 into the room.

Since the room temperature is low at the beginning of the operation, the heating output (the amount of combustion) is maximized. Then, the frequency of the fuel pump 13 is controlled so as to obtain this output, and the rotation speed of the burner fan 14 is controlled. In addition, the phase of the hot air fan 15 is controlled so as to obtain a hot air amount corresponding to the heating output. For this reason, as shown in FIG. 3, the room temperature rises rapidly.

The microcomputer 10 stores a set temperature Ts adjusted by the temperature setting switch 8. Microcomputer 1
A value 0 determines a temperature Tsl lower than the set temperature Ts by a certain temperature (for example, 1 ° C. or 2 ° C.), and compares the Tsl with room temperature. Then, when the room temperature becomes equal to or higher than Tsl, the forced strong combustion at the maximum output is stopped, and the heating output is controlled according to the room temperature or the like.

That is, the microcomputer 10 periodically calculates a deviation e between the set temperature Ts and the room temperature T, stores the deviation e, and periodically calculates a temperature difference ΔT between the current room temperature and the previous room temperature. Remember.

The microcomputer 10 has a built-in stability counter shown in the flowchart of FIG. This stability counter calculates the temperature difference Δ between the current room temperature and the previous room temperature.
Comparing the size of T with a fixed value, adding 1 to the count value N (initial value is 0) if ΔT is less than the fixed value, and returning the count value N to 0 when ΔT exceeds the fixed value. It is.

The microcomputer 10 calculates the deviation e and the temperature difference Δ
The grade of the membership function shown in FIGS. 6 to 8 is obtained from T and the count value N. In FIG. 8, N0 is used at the beginning of a low initial room temperature operation (until the room temperature becomes stable for the first time), and N1 is used at the beginning of a high initial room temperature operation start or at room temperature fluctuation due to ventilation or the like. It is properly used inside the microcomputer in consideration of the initial room temperature and the like. Of course, since the room temperature T is unstable at the beginning of the operation, the room temperature is not stable, and the count value of the stability counter is 0. Therefore, in FIG. 8, N0 = 1 and N2 =
0 holds, and N1 is treated as 0.

The above-described grade values of the membership function of the deviation e, the temperature difference ΔT, and the count value N are stored in three look-up tables (FIGS. 9 to 1) stored in the microcomputer 10.
Applies to 1).

At the beginning of the operation, both the stability membership functions N1 and N2 are 0, and N0 = 1 holds. Therefore, after the room temperature Ts exceeds Tsl, FIG.
Are used, and the grade values of e and ΔT are substituted into this lookup table. Then, the amount of change in the rotation speed (corresponding to the heating output) of the burner fan 14 is calculated based on the weighting rule of the fuzzy inference.

The change amount of the look-up table in FIG. 9 is set to be larger than that in FIGS. 10 and 11, and even if the room temperature T reaches the set temperature Ts, the reduction in the heating output is suppressed. T is set to be higher than the set temperature Ts. This is because, as shown in FIG. 3, at the beginning of the heating operation in which the initial room temperature is low, the room is sufficiently heated to prevent the user from feeling cold due to radiation from the wall.

When the room temperature T exceeds the set temperature Ts to some extent, the heating output is greatly reduced, and the room temperature T gradually decreases. In this process, the stability at room temperature increases, and the count value of the stability counter increases. As a result, when the grade value of N0 of the stability membership decreases and the grade value of N2 increases, the microcomputer 10 uses the look-up tables of FIGS. 9 and 10 together and adjusts the heating output according to the weighting rule. Become.

In the look-up table of FIG. 10, the amount of change in heating output for the same deviation and the same temperature difference is smaller than that of the look-up table of FIG. Approach. Therefore, unlike the conventional case shown by the broken line in FIG. 3, the room temperature T does not fall significantly below the set temperature Ts, and can be stabilized near the set temperature Ts. Further, since the amount of change in the heating output is extremely small when the room temperature is stable, the amount of combustion and the amount of air can be prevented from changing significantly with the increase or decrease in the heating output.
Stable heating operation is performed.

When the room temperature is lowered during the heating operation due to ventilation or opening of the door, the count value N of the stability counter is set.
Returns to 0. At this time, the stability membership function is N
1 = 1, N2 = 0 (N0 is treated as 0), and the microcomputer 10 changes the heating output according to the grade values of e and ΔT using the lookup table of FIG. FIG.
The change amount of the heating output based on the look-up table 1 is larger than that of FIG. 10 and smaller than that of FIG. This is because the wall is sufficiently warm when the room temperature is lowered due to ventilation or the like, and it is not necessary to raise the room temperature T significantly compared to the set temperature Ts.

After that, as the room temperature becomes stable, FIG.
When the look-up tables of FIG. 11 and FIG. 11 are used together and the room temperature is sufficiently stabilized, only the look-up table of FIG. 10 is used and the room temperature is maintained near the set temperature.

In the above-described embodiment, attention is paid to the stability of the detected value of the room temperature, and the amount of change in the heating output when the room temperature is unstable and when the room temperature is unstable is made different using fuzzy inference.
As shown in FIG. 12, paying attention to the stability of the room temperature, the target temperature Tk is set higher than the set temperature Ts when the stability is low, and Tk approaches Ts as the stability increases. The heating output may be controlled so as to change along the line.

[0027]

Since the present invention is configured as described above, the amount of change in the air-conditioning output is increased at the beginning of operation or at the time of ventilation when the stability of temperature and humidity is low, so that the temperature and humidity exceed the set values. In addition, it is possible to perform a comfortable air-conditioning operation with less influence of radiation, etc., and to reduce the change in air-conditioning output when the temperature and humidity stability is high, and realize a stable air-conditioning operation with little overshoot. The same applies to the second embodiment.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device showing one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the microcomputer of the control device.

FIG. 3 is an explanatory diagram showing a change characteristic of a room temperature by a control device.

FIG. 4 is a perspective view of a warm air heater showing an example of the air conditioner.

FIG. 5 is a flowchart for explaining the operation of a stability counter incorporated in the microcomputer.

FIG. 6 is an explanatory diagram of a membership function of a deviation e.

FIG. 7 is an explanatory diagram of a membership function of a temperature difference ΔT.

FIG. 8 is an explanatory diagram of a membership function of a count value N of a stability counter.

FIG. 9 is an explanatory diagram of a first lookup table for calculating an air conditioning load.

FIG. 10 is an explanatory diagram of a second lookup table.

FIG. 11 is an explanatory diagram of a third look-up table.

FIG. 12 is an explanatory diagram showing control characteristics of another embodiment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot air heater 6 Control device 8 Temperature setting switch 9 Room temperature sensor 10 Microcomputer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 11/02 F24F 11/02 102

Claims (2)

(57) [Claims] 1. A method for comparing a detected value such as temperature and humidity with a set value and controlling an air conditioning output such as cooling, heating or dehumidifying based on the comparison result, and determining a stability of the detected value. When the stability is low, the deviation between the detected value and the set value, and / or
Alternatively, the amount of change in the air conditioning output with respect to the change width of the detected value is increased, and when the stability is high, the deviation between the detected value and the set value, and / or
Alternatively, the control device for an air conditioner is configured to reduce a change amount of the air conditioning output with respect to a change width of the detected value. 2. A method of controlling a detected value of temperature, humidity, etc. and a set value, and controlling an air conditioning output such as cooling, heating, and dehumidifying based on the comparison result, and determining a stability of the detected value. When the stability is low, the air conditioning output is controlled so that the detected value exceeds the set value, and when the stability is high, the air conditioning output is controlled so that the detected value is approximately equal to the set value A control device for an air conditioner, comprising: