JPH04177038A - Temperature control device for air conditioner - Google Patents

Abstract

PURPOSE:To enable a control over a heating calorie to be controlled in correspondence with a variation in thermal load by a method wherein a controlled variable of heating calorie for use in controlling a heating source for an air conditioner is stored, an amount of shift for shifting a relation between a temperature difference between a room temperature and a set temperature and a controlled variable of heating calorie is determined, the heating calorie controlled variable is determined in response to the temperature difference and the shifting amount, outputted to a heating calorie control device and then a heat source is controlled. CONSTITUTION:As a switch of heating operation is pressed, a set temperature Ts, a room temperature Ta and an initialization value of a shifting amount S are inputted. A position value or a negative value of a temperature difference DELTAT between the set temperature Ts and the room temperature Ta is judged. If DELTAT<0, a compressor 6 is turned off and a descending of the room temperature Ta is waited. If DELTAT>=0 is attained, the compressor 6 is turned on, a timer for counting an operation time for the compressor 6 and a counter for counting a heating calorie controlled variable are energized so as to calculated a temperature difference DELTAT=Ts-Ta+S. A positive value or a negative value of the temperature difference DELTAT is judged, and if DELTAT>=0 is attained, a heating calorie controlled variable (q) determined by the temperature difference DELTAT is calculated, this value is outputted to a heating amount controlling device 5 and this is controlled without changing a shifting amount S.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature control device for an air conditioner that is controlled based on the difference in temperature between room temperature and a set temperature.

[Prior Art] Figures 8 and 9 are explanatory diagrams of the operation of a conventional combustion control device disclosed in Japanese Patent Publication No. 14050/1983, and Figure 8 shows the operation of the conventional combustion control device shown in Japanese Patent Publication No. 62-14050. The heat quantity decoding diagram, Figure 9, is a diagram in which the heat load curve of the room is added to the heat quantity decoding diagram.

In FIG. 8, ΔT represents the temperature difference, and q represents the amount of heat generated.

Seven levels of reference signals J0 to J are generated and decoded as the temperature difference ΔT. Based on this decoding result 90
Control to any of the 7 levels of heat generated from ~q6, or
Or it causes combustion to stop.

In Fig. 9, Q is the generated heat amount curve based on Fig. 8.

a is the heat load curve for low heat load (for example, when there are few people in the room), b is the heat load curve for high heat load (for example, when there are many people in the room), and the horizontal axis in the upper row is the temperature difference ΔT (set temperature Ts
- room temperature Tx), and the lower horizontal axis indicates the set temperature Ts? 2
An example of room temperature Tx at °C is shown. At this time, the generated heat amount curve Q and the heat load curve a.

The intersection point Ta and Tb of b becomes the center point of the room temperature.

That is, for the same set temperature Ts, the low heat load curve a
In a room with a low heat load and a room with a high heat load curve, the set temperature Ts is stabilized at room temperature Ta in a room with a low heat load, and stabilized at room temperature Tb in a room with a high heat load, resulting in an error with respect to the set temperature Ts. occurs. As a countermeasure for this, the temperature difference ΔT
If an attempt is made to eliminate the error by increasing the rate of change in heat quantity, a hunting phenomenon will occur at room temperature.

FIG. 10 is an explanatory diagram of the operation of another conventional air conditioner temperature control device disclosed in, for example, Japanese Utility Model Publication No. 1-14841. Note that the dotted portions in the figure indicate the compressor operation time periods, and the blank portions indicate the air blowing time periods.

When the cooling operation switch is pressed, the indoor blower rotates, and when the room temperature Ta (hereinafter, room temperature is represented by Ta) is higher than the set temperature Ts, the compressor starts operating. At the same time, a timer is started that counts the operating time of the compressor. Now, the room temperature Ta will decrease, but its value will always remain at the set temperature Ts.
It is compared with.

The operating time of the compressor is also compared with a predetermined time τ.

Here, when the room temperature Ta reaches the set temperature Ts within a predetermined time τ□, the compressor is turned off, only air is blown, and at the same time the timer is turned off. Since the compressor is turned off, the room temperature Ta rises, and its value is compared with a temperature obtained by adding the temperature difference β to the set temperature Ts (Ts + β). When the room temperature Ta becomes higher than the temperature (Ts+β), the compressor is turned on and at the same time the timer counts the operating time of the compressor.

Now, the room temperature Ta falls again, but if the room temperature Ta does not reach the set temperature Ts even after the predetermined time τ□, the set temperature Ts is shifted to the lower temperature side by the shift amount α, and the compressor is operated. will continue. Then, when the room temperature Ta reaches the new set temperature (Ts-α), the compressor is turned off. As a result, the room temperature Ta rises again.

[Problems to be Solved by the Invention] In the conventional temperature control device for an air conditioner as described above, the room temperature T
If a does not reach the set temperature Ts, the set temperature Ts is shifted by the shift amount α, but since it is a heat source with a fixed amount of heat, the amount of room temperature fluctuation cannot be changed, and variable heat amount control For heat sources such as In order to determine the shift amount, it is necessary to set the above predetermined time to a short time, but if it is set to a short time, accuracy during high heat loads cannot be ensured.
There is a problem that the shift amount is not stable.

This invention has been made to solve the above problems, and provides a temperature control device for an air conditioner that can reduce the error in room temperature with respect to the set temperature even in rooms with different heat loads. With the goal.

[Means for Solving the Problems] A temperature control device for an air conditioner according to the present invention stores a heat amount control amount for controlling the heat source (compressor) of the air conditioner, and calculates room temperature and temperature from the stored heat amount control amount. A shift amount for shifting the relationship between the temperature difference between the set temperatures and the amount of heat control is determined, and the amount of heat control is determined from the difference in temperature and the shift amount, and the amount is output to the heat amount control device to control the heat source. be.

[Function] In this invention, the heat load of the room is estimated by storing the heat amount control amount for controlling the heat source and determining the generated heat amount, and the shift amount is determined from this estimated heat load. and,
The relationship between the amount of heat and the temperature difference between the indoor temperature and the set temperature is automatically changed by this shift amount, and the amount of heat is controlled in response to heat load fluctuations.

[Embodiment] Fig. 1 to Fig. 5 are diagrams showing an embodiment of the present invention, in which Fig. 1 is an overall configuration diagram, Fig. 2 is a block diagram, and Fig. 3 is a flowchart showing operations during heating. , FIG. 4 is an explanatory diagram of the relationship between the amount of heat generated during heating and the temperature difference, and FIG. 5 is a diagram of a room temperature change curve.

In Fig. 1, (1) is an indoor temperature measuring device that is composed of a thermistor etc. and measures the room temperature Ta, (2) is an indoor temperature setting device that is composed of keys etc. and is used to set the set temperature Ts, and (3) is the room temperature T
A temperature difference detector that outputs the temperature difference ΔT between a and the set temperature Ts, (
4) is a heat amount control amount determining means that determines the amount of heat generated from the temperature difference ΔT and the shift amount S, and (5) is comprised of an inverter drive circuit, etc. ), (7) is a control amount storage means for storing the enthusiasm control amount of the heat amount control device (5), and (8) is a heat amount control amount input from the control amount storage means (7). The shift amount S is determined from the calorie control amount determining means (4
), the shift amount determining means (9) is manually operated and outputs a command to change the set temperature Ts to the shift amount determining means (8).
This is a setting change command device that outputs to

In Fig. 2, (11) is a control device consisting of a microcomputer (hereinafter referred to as microcomputer);
It has ROM (11B) and RAM (IIc),
It is connected to an indoor temperature measuring device (1), an indoor temperature setting device (2), and an inverter (5). Note that the compressor (6) corresponds to the heat source (6) in FIG.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 to 5. Note that the program in the flowchart of FIG. 3 is written in the ROM (II
B).

When the heating operation switch is pressed, the air conditioner starts operating in step (21), and the set temperature T is set in step (22).
s, the room temperature Ta, and the initial settings of the shift amount S. In step (23), it is determined whether the temperature difference ΔT between the set temperature Ts and the room temperature Ta is positive or negative, and if ΔT<O, the compressor (6) is turned off in step (24), and the process returns to step (22). Repeat steps 22) to (24) and wait for the room temperature Ta to fall. If ΔT≧O, proceed to step (25), turn on the compressor (6), and in step (26) start a timer that measures the operating time of the compressor (6) and a counter that counts the amount of enthusiasm control. let In step (27), the temperature difference ΔT
=Ts-Ta+S is determined.

In step (28), determine whether the temperature difference ΔT is positive or negative, and 8T≧0
If so, in step (29), the heat amount control amount q determined by the temperature difference ΔT is determined, and this is output to the heat amount control device (5), where it is controlled without changing the shift amount S. Also,
If ΔT is determined in step (28), the compressor (6) is turned off in step (30).

Then, in step (31), it is determined whether the time measured by the timer is within a predetermined time t1, and if it is within the predetermined time t1, step (31) is performed.
Return to step 27), repeat steps (27) to (31), and wait for time to pass. If the measurement time exceeds the predetermined time t0, the heat load in the room is estimated based on the value of the counter in step (32), and the shift amount S is changed. After the change, the timer and counter are activated again in step (33), and the process returns to step (27).

Figure 4 (a) shows the relationship between the generated heat amount curve Q at shift amount S = O at the time of initial setting, the low heat load curve a, and the high heat load curve. The temperature is set at ΔT3.

Figure 4(b) shows the relationship between the temperature difference ΔT and the amount of heat generated q when a shift is performed after a predetermined time t2 in the case of a low heat load, and the temperature difference ΔT2 is smaller than the initial temperature difference ΔT□. are doing. FIG. 4(c) similarly shows an example of a shift under a high heat load, in which the temperature difference ΔT4 is reduced compared to the initial temperature difference ΔT3.

FIG. 5(a) shows the change in room temperature Ta with respect to time under a low heat load, and FIG. 5(b) similarly shows the room temperature Tb under a high heat load.

FIG. 6 is a diagram showing another embodiment of the present invention, and is a block diagram when applied to a kerosene heater, in which the frequency control mechanism (41) replaces the inverter (5) in FIG. (
6), an oil pump (42) is used. Further, the combustion blower (43) is connected to the control amount W (11) via the rotation control mechanism (44), and the rotation detector (45)
) detects the rotational speed of the blower (43), and this is input to the control device (11) as the amount of heat control.

Note that it is also possible to use the control amount of the oil feed pump (42) as the heat amount control amount.

FIG. 7 is also a diagram showing another embodiment of the present invention, and is a block diagram when applied to a gas heater, in which the current control mechanism (47) replaces the inverter (5) in FIG. (6
) An electromagnetic governor (48) is used instead. Although the rotation speed of the blower (43) is detected as the enthusiasm control amount, it is also possible to use the control current of the electromagnetic governor (48).

[Effects of the Invention] As explained above, in this invention, the heat load of the room is estimated by storing the heat amount control amount for controlling the heat source and calculating the generated heat amount, and from this estimated heat load, the temperature difference and the heat amount control amount are calculated. Since the amount of shift in the relationship is determined, it is possible to reduce the error in the room temperature relative to the set temperature even in rooms with different heat loads.

[Brief explanation of the drawing]

1 to 5 are diagrams showing an embodiment in which a room temperature control device according to the present invention is applied to an air conditioner, and FIG. 1 is an overall configuration diagram;
Fig. 2 is a block diagram, Fig. 3 is a flowchart showing the operation during heating, Fig. 4 is an explanatory diagram of the relationship between the amount of heat generated during heating and the temperature difference, Fig. 5 is a room temperature change curve diagram, Figs. Fig. 7 is a diagram showing another embodiment of the present invention, Fig. 6 is a block diagram applied to an oil heater, Fig. 7 is a block diagram applied to a gas heating system, and Figs. 8 and 9 are diagrams showing a conventional example. This is a diagram showing a room temperature control device. Figure 8 is a calorific value decoding diagram for the temperature difference between the set temperature and the room temperature, Figure 9 is a diagram with the heat load curve of the room added to Figure 8, and Figure 10 is also a diagram of the conventional room temperature. It is an operation explanatory diagram showing a control device. In the figure, (1) is an indoor temperature measuring device, (2) is an indoor temperature setting device, (3) is a differential temperature detector, (4) is a heat quantity control amount determining means, (5) is a heat quantity control device, and (6) is a heat quantity control amount determining means. ) is the heat source (compressor), (
7) is a control amount storage means, (8) is a shift amount determination means, (
41) is a heat amount control device (frequency control mechanism), (42)
is the heat source (oil pump), (45) is the rotation detector, (47
) is a heat quantity control device (current control mechanism), and (48) is a heat source (electromagnetic governor). Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In an air conditioner that detects a temperature difference between an indoor temperature and a set temperature and starts and stops a heat source via a heat amount control device based on the detected temperature difference, a control amount storage means for storing a heat amount control amount of the heat amount control device; shift amount determining means for determining the amount by which the relationship between the temperature difference and the amount of heat control is to be shifted from the output of the storage means; and determining the amount of heat control from the temperature difference and the shift amount and outputting the determined amount to the heat amount control device. 1. A temperature control device for an air conditioner, comprising: means for determining a controlled amount of heat.