JPH059703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an air conditioner, and in particular to a control device for an air conditioner that can be applied to a control device for an automatic temperature setting method (usually referred to as a dream circuit) for room air conditioners during sleep. Regarding equipment.

Fig. 1 is a block diagram showing the configuration of a conventional air conditioner control device, where 1 is a temperature setting device, 2 is a subtracter, 3 is a constant generator, 4 is an adder, and 5 is a constant generator. , 6 is an operation switch, 7 is a timer, 8 is a cooling/heating switch, 9 is a subtracter, 10 is a temperature detector, 11 is a PID controller, 20, 21, 22, 23
Each indicates a changeover switch.

The operation of the control device shown in FIG. 1 will be described.
First, if the dream circuit does not work, the changeover switches 20 and 21 are both in contact with the a side, and from the set value set by the temperature setting device 1 (this is referred to as Tsi), an appropriate value for the room to be air-conditioned is set. A subtracter 9 performs an operation to subtract a temperature signal (this is referred to as Tin) from a temperature sensor 10 placed at a location,
This result becomes the input to the PID controller 11 as the deviation ε (=Tsi−Tin). The PID controller 11 has a deviation ε
It works to make it zero and outputs the manipulated variable. Normally, the manipulated variable that is the output of the PID controller 11 becomes a command value for the rotation speed of the compressor, which controls most of the heating and cooling capacity of the air conditioner.

Next, we will explain the effect when the dream circuit works. In this case, the user of the air conditioner first turns on the operation switch 6 to activate the dream circuit.
Operate to start timer 7. The timer 7 turns the changeover switches 20 and 21 to side b after a certain period of time (tc [time]) after being started. Further, the changeover switches 22 and 23 are connected to the a side for heating, and to the b side for cooling, by the cooling/heating changeover switch 8. In the case of heating, the set value Tsi set by temperature setting device 1 is tc [time]
Afterwards, a value predetermined by the constant setter 3 (this is ΔTh) is subtracted by the subtracter 2, and the true set value Ts (=Tsi−ΔTh) is obtained.
In the case of cooling, the set value Tsi set by the temperature setting device 1 is changed to a value predetermined by the constant generator 5 by the adder 4 after tc [time] (this is set as ΔTc). is added to the true set value Ts
(=Tsi+ΔTc). Therefore, PID controller 11
works to make the deviation ε′ (=Ts−Tin) zero.

The effects of the control device shown in FIG. 1 above are shown in FIGS. 3 and 4, respectively. First, the effect during heating will be explained with reference to FIG. FIG. 3a shows the progress of changing the set values. That is, the dream circuit operation switch is turned on at time t ₀ , and tc [time]
At a later time _t1 , the set value is changed from Tsi to Ts, which is lower by ΔTh. By changing this set value, the manipulated variable C of the compressor rotation speed, which is the output of the PID controller 11, becomes the third
It changes as shown in Figure b. That is, at time _t1 , the deviation that is input to the PID controller 11 changes from ε to ε'. The relationship between these magnitudes is |ε|<|ε′| (ε′=ε−
ΔTh), so when the deviation suddenly increases to the negative side, the manipulated variable is output in an attempt to cancel this. Depending on the case, this may look like a broken line,
The amount of operation may be such that the compressor is stopped at one end, and in this case, it is necessary to wait for the compressor restart time td. In any case, due to the sudden change in the set value, the manipulated variable becomes as shown in FIG. 3b, and as a result, the room temperature Tin becomes as shown in FIG. 3c. The dashed lines in FIG. 3c correspond to the dashed lines in FIG. 3b.

Next, referring to FIG. 4, the effect during cooling will be explained. The process of changing the set value is as shown in FIG. 4a, in contrast to the case during heating, at time _t1 , the set value is changed from Tsi to Ts higher by ΔTc. By changing this setting value,
As in the case of heating, the contact amount C becomes as shown in Fig. 4b, and as a result, the room temperature Tin becomes as shown in Fig. 4c.

Although the conventional dream circuit shown in FIG. 1 has the above effects, it has the following drawbacks.

In the first place, the purpose of the Dream Circuit is that while sleeping, the temperature setting value can be set lower than when heating, and higher when cooling, without sacrificing comfort, and by doing so, it lowers the compressor load factor. The aim is to lower the power consumption and contribute to reducing power consumption. However, in the conventional control device, as described above, since the set value is changed suddenly, the room temperature approaches the set value after greatly hunting as shown in FIGS. 3c and 4c. This hunting greatly impairs comfort immediately after going to bed. Especially when the air conditioner is being cooled, this hunting can cause those who have been asleep to wake up again.

The present invention was proposed in view of the above circumstances, and its purpose is to prevent the occurrence of hunting when changing set values in the dream circuit,
An object of the present invention is to provide a control device for an air conditioner that can maintain comfort during sleep.

An air conditioner control device according to the present invention is an air conditioner control device including means for changing a set value set in a temperature setting device to a predetermined value and outputting it by operating a sleep timer. It is characterized by adding a first-order lag calculation means to the above means, and in the dream circuit, the set value is changed smoothly and the room temperature is changed without causing hunting, so that comfort immediately after going to sleep can be maintained. In this way, the above-mentioned conventional drawbacks can be overcome.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing the configuration of one embodiment of the present invention, and FIGS. 5 and 6 are diagrams for explaining the operation of the embodiment shown in FIG. 2, respectively.

In FIG. 2, the parts indicated by 1 to 11 and 20 to 23 and the configurations of these parts are the same as those shown in FIG. 1. In the present invention, a first-order lag calculator 100 is connected in series between each of the conventional changeover switches 21 and 23 shown in FIG.

The operation of the above embodiment of the present invention will be explained.

In the present invention, except for the first-order lag calculator 100, its operation is the same as that shown in FIG.
Only the difference in effect due to the addition of is explained.

In FIG. 2, the timer 7 is started by the operation switch 6 and the set value is changed after tc [time], but the first-order delay calculator 100 can explain the process of changing the set value as shown in FIG. 5a (during heating). As shown in FIG. 6a (when cooling), the temperature changes smoothly with time.

Note that the transfer function of the first-order lag calculator 100 is 1/1+τ·S when expressed in the frequency domain. Here, τ is a time constant, and S means a Laplace operator.

Due to the action of the above setting value changing process, the change in the manipulated variable becomes as shown in Figure 5b (during heating) and Figure 6b (during cooling), and as a result, the room temperature also changes as shown in Figure 5c (during heating). , there is a smooth transition as shown in FIG. 6c (during cooling). In this way, compared to the conventional method, there is no hunting in the room temperature due to changes in the set value, so the effect of maintaining comfort while sleeping is exhibited.

In the embodiment of the present invention, the time constant τ of the first-order lag calculator 100 is the same value during heating and cooling. However, when the first-order lag calculator 100 It goes without saying that the constant τ may have different values for heating and cooling.

As described above, according to the present invention, the first-order delay calculation means is added to the means for changing the set value set in the temperature setting device to a predetermined value and outputting it by the operation of the sleep timer, thereby reducing the consumption. In addition to reducing power consumption, it is possible to prevent the occurrence of hunting when changing set values in the dream circuit, thereby achieving excellent effects such as maintaining comfort during sleep.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of a conventional example;
The figure is a block diagram showing the configuration of an embodiment of the present invention.
3 and 4 are diagrams for explaining the operation of the conventional example, respectively, and FIGS. 5 and 6 are diagrams for explaining the operation of the embodiment shown in FIG. 2, respectively. 1...Temperature setting device, 6...Operation switch, 7...
...Timer, 11...PID controller, 20-23...
...Changing switch, 100...First-order delay calculator.

Claims (1)

[Claims] 1. In an air conditioner control device equipped with means for changing a set value set in a temperature setting device to a predetermined value and outputting the same by the operation of a sleep timer, a first-order lag calculation means is added to the means. An air conditioner control device characterized by: