JPH0563691B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a temperature control device for an air conditioner, and in particular, the present invention relates to a temperature control device for an air conditioner, and in particular, the present invention is concerned with a temperature control device for an air conditioner. The present invention relates to a temperature control device for an air conditioner that controls the temperature by setting various temperature ranges.

(Prior art) For example, in small air conditioners such as heaters such as oil fan heaters and coolers used in general homes, it is necessary to bring the room temperature close to the set temperature in a short time and then once it reaches the set temperature. The challenge is how to stably maintain the room temperature that has been reached at the set temperature.
Various temperature control methods have been proposed for maintaining the room temperature at a set temperature.

For example, in a heater such as the oil fan heater mentioned above, the simplest control method is to set the room temperature T to the set temperature.
When T _S is exceeded, combustion stops and the room temperature T becomes the set temperature.
When the temperature drops below T _S , combustion restarts.

Next, the precise control method is to change the combustion amount, that is, the temperature control amount, from [strong] to [weak], as shown in Figure 9.
It is possible to switch between two stages, and the room temperature T is the set temperature T _S
When the temperature exceeds the temperature, the temperature control amount is set to [weak], and when the room temperature T falls below the set temperature T _S , the temperature control amount is set to [strong].
However, if the temperature control amount is [strong]
[Weak] In case of only two-stage switching, room temperature T
However, this results in a large hysteresis characteristic centered around the set temperature T _S , which cannot be said to be accurate temperature control.

In order to solve this problem, as shown in Figure 10, the temperature control amount is divided into three types: [strong], [medium], and [weak].
Temperature range (T S ±α) that can be switched in stages and has a constant temperature width (±α) around the set temperature _{T S}
is set, and the room temperature T is the upper limit temperature of the temperature range (T _S +
α), the temperature control amount is set to [weak], and when the room temperature T is within the temperature range (T _S ±α), the temperature control amount is set to [medium], and the temperature control amount is set to [medium] when the room temperature T is within the temperature range (T A system is being considered in which the temperature control amount is switched to [strong] when the temperature falls below _S - α).

By setting a constant temperature range (T _S ±α) in this manner and controlling the temperature control amount by switching it in three stages, more delicate temperature control becomes possible.

(Problems to be Solved by the Invention) However, even when the temperature is controlled by providing a certain temperature range (T _S ±α) as described above, the following problems still remain to be solved. In other words, like in the middle of winter, the outside temperature and room temperature T
If the temperature _difference between
-α), the temperature control amount switches from [Strong] to [Medium], but with the [Medium] temperature control amount, the temperature drops before the room temperature T reaches the upper limit temperature ( _TS + α). below the lower limit temperature (T _S −α). Therefore, the room temperature T fluctuates around the lower limit temperature (T _S -α).

In addition, on a warm day when the temperature difference between the outside air and the room temperature T is small, as shown in the A characteristic in the same figure, the temperature control amount exceeds the upper limit temperature (T _S + α) of the temperature range at the [medium] stage. . Therefore, at that point, the temperature control amount is switched from [medium] to [weak].
Then, when the room temperature T falls below the upper limit temperature (T _S +α) again, the temperature control amount is switched to [medium]. As a result, in this case, the room temperature T is the upper limit temperature (T _S + α)
Move up and down around the center.

In this way, due to the temperature difference between the outside air and the room temperature T,
As shown in the A and B characteristics in Figure 10, the set temperature
The temperature stability point of room temperature T with respect to T _S is the lower limit temperature (T _S
-α) and the upper limit temperature (T _S +α). Therefore, even though the set temperature T _S is constant, if the outside temperature changes, the room temperature T changes, and it cannot be said that accurate temperature control is achieved.

Note that the above-mentioned problem is not limited to heaters, and similar problems occur in air conditioners such as coolers.

The present invention has been made based on the above circumstances, and its purpose is to switch the temperature control amount into three stages and set two types of temperature ranges with different temperature widths. An object of the present invention is to provide a temperature control device for an air conditioner that can perform highly accurate temperature control.

[Structure of the Invention] (Means for Solving the Problems) In the temperature control device for an air conditioner according to the present invention, as shown in FIG. A first temperature range ( _{T S} ±α) and a second temperature range (T _S ±β) having a second temperature range (±β) wider than the first temperature range.
Then, the temperature sensor 4 is controlled by the temperature rough adjustment means 5.
When the detected room temperature T is out of the second temperature range, the temperature control amount 1 is controlled to a strong or weak level depending on the direction in which the room temperature T falls within the second temperature range, and the temperature fine adjustment means 6, when the room temperature deviates from the first temperature range, the temperature control amount 1 is moved by one step in the direction in which the room temperature T falls within the first temperature range.

(Function) In the temperature control device for an air conditioner configured in this way, for example, the room temperature T is within the first temperature range (T _S ±
α), the current temperature control amount moves by one step in the direction in which the room temperature T returns to within the first temperature range. Therefore, under normal conditions, the room temperature is controlled within the first temperature range. If the room temperature T deviates from the first temperature range due to the temperature difference with the outside temperature, and even though the temperature control amount has shifted by one step, it also deviates from the second temperature range. The temperature control amount is forcibly set to be strong or weak in the direction of returning to the second temperature range. As a result, the room temperature T returns within the first temperature range as well as within the second temperature range in the shortest possible time.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 2 shows a case where the temperature control device for an air conditioner according to the embodiment is incorporated into an oil fan heater. That is,
11 in the figure is CPU (Central Processing Unit), ROM, RAM
It is a microcomputer with a built-in storage unit, A/D conversion circuit, input/output ports, etc. The room temperature T and set temperature T _S (T _N ) from the temperature sensor 4 and temperature setter 3 are input to each A/D input port of the microcomputer 11.

In the temperature sensor 4, a thermistor 4a is inserted between the DC +V _C control power supply terminal and the ground.
The temperature at the connection point between the resistor 4b and the resistor 4b is inputted to the microcomputer 11 as the room temperature T. Also,
In the temperature setting device 3, a resistor 3a and a variable resistor 3 are inserted between the DC +V _C control voltage terminal and the ground.
The potential at the variable terminal of the variable resistor 3b in the series circuit consisting of the variable resistor 3b and the resistor 3c is inputted to the microcomputer 11 as the set temperature T _S (T _N ).

Further, each output port P1, P2, P3, P4 of this microcomputer 11 is connected to an open collector type inverter 12a, 12b, 12c, 1, respectively.
2d to one end of each relay 13, 14, 15, 16, and the other end of each relay 13 to 16 is connected to a DC +V _D drive voltage terminal.

FIG. 3 is a circuit diagram of an oil fan heater incorporating this temperature control device. That is, a combustion motor 18 is connected to a 100V AC power source 17 via a contact 15a of a relay 16. Furthermore, the relay 13 is connected to the AC power supply 17 via the contact 16a.
A circuit is connected between the contact 13a of the relay 14 and a solenoid 19 that controls the opening degree of the solenoid valve inserted in the fuel supply path that guides the fuel in the fuel tank to the combustion chamber. A circuit is connected to a solenoid 20 that controls the degree of opening of the solenoid valve to [weak]. Also, a contact point 15a between the ignition transformer 21 and the relay 15 for igniting the fuel.
A circuit between the fan motor 22 that sends hot air into the room and the contact 15a is connected to the AC power source 17 via the contact 16a.

In such a circuit configuration, when the power of the microcomputer 11 is turned on and the output port P4 is set to H level and the relay 16 is activated, the combustion motor 18 is started and the ignition transformer 21 is activated.
is energized. The opening degree of the solenoid valve, that is, the combustion amount (temperature control amount) of the oil fan heater is controlled by the output level of the output ports P1 and P2. When only output port P2 is set to H level, only solenoid 20 is energized, and the temperature control amount is set to [weak].
, and if only output port P1 is set to H level,
Only the solenoid 19 is energized, and the temperature control amount becomes [medium]. Furthermore, when the output ports P1 and P2 become H level, the solenoids 19 and 20 are energized and the temperature control amount becomes [strong]. When a certain period of time has elapsed since the fuel was ignited in the ignition transformer 21, the output port P3 is set to H level, the energization of the ignition transformer 21 is stopped, and the fan motor 22 is started. As a result, warm air is supplied indoors.

Further, in the RAM built in the microcomputer 11, as shown in FIG.
R1, set temperature T _S set by temperature setting device 3
(T _N ) is stored in the set temperature range R2, the operating temperature range R3 is used to store the operating temperature T _C used when setting the temperature control amount in comparison with the room temperature T at that time, and the room temperature T is the first temperature range. Flag area that stores the UP graph indicating that the lower limit temperature (T _{S −α) of (T S ±} α) has been reached and the temperature control amount has been increased by one step.
R4 also stores a DW flag indicating that the room temperature T has reached the upper limit temperature ( _TS + α) and the temperature control amount has been lowered by one step. Flag area R5 stores a controlled variable variable HV indicating the current temperature control amount. Temperature control amount area
R6 etc. are formed.

The value of this controlled variable variable HV is one of 1, 2, and 3, where 1 corresponds to the temperature controlled variable [weak],
2 corresponds to [medium], and 3 corresponds to [strong]. Therefore, if the value of the controlled variable variable HV changes by 1, the temperature control moves by one step.

Furthermore, the set temperature T _S stored in the set temperature range R2 is cleared at the moment the oil fan heater is powered on, and becomes the initial value T _S =
Set to 0°C.

Accordingly, the microcomputer 11 adjusts the temperature control amount to [strong] and [medium] according to the flowchart in FIG.
The program is configured to perform switching control in three stages: [Weak]. When the flowchart is started, a new set temperature T _N of the temperature setting device 3 is read in S1.
Furthermore, the room temperature T is read from the temperature sensor 4. S2
It is checked whether the new set temperature T _N read in is equal to the set temperature T _S stored in the set temperature region R2 of the RAM. When the power is turned on, the set temperature T _S of the set temperature range R2 and the new set temperature T _N of the temperature setting device 3 are set.
Of course they are not equal. Furthermore, if the set temperature is changed midway through, the results are not equal. If they are not equal in this way, in the processing after S3, first, the current room temperature T
is placed in a third temperature range (T _N ±γ) having a third temperature range (±γ) narrower than the first temperature range (±α) centered on the new set temperature T _N .

That is, if the room temperature T exceeds the upper limit temperature (T _N + γ) of the third temperature range, the controlled variable variable HV of the temperature control amount region R6 is set to 1, and in S4 the room temperature T exceeds the lower limit temperature (T _N - γ), the controlled variable variable
Set HV to 3. Thereafter, the process advances to S5 and the drive output process shown in FIG. 6 for actually driving the solenoid valve is performed.

In the drive output process shown in FIG. 6, the controlled variable variable HV in the controlled variable area R6 of the RAM is read out, and if the controlled variable variable is 1, the output port P2 corresponding to [weak] is set to H level and the relay 14 is activated. drive. When the controlled variable variable HV is 2, the output port P1 corresponding to [Medium] is set to H level and the relay 13 is driven. When the controlled variable variable HV is 3, the output ports P1 and P2 corresponding to [strong] are set to H level and the relays 13 and 14 are driven. Then, the process returns to S1 of the main routine in FIG. 5 and reads the set temperature T _N and room temperature T again.

When the room temperature T enters the third temperature range (T _N ±γ) at the newly read set temperature T _N in S4,
The control variable variable HV is set to 2, which corresponds to [medium], and the newly read set temperature T _N is stored in the set temperature range R2 as the set temperature T _S. Then, the drive output process of S5 is executed.

When the newly read set temperature T _N in S2 becomes equal to the set temperature T _S in the RAM set temperature range R2, it is determined that the room temperature T has once fallen within the third temperature range (T _S ±γ). And RAM operating temperature range R3
The operating temperature T _C of is set to the upper limit temperature (T _S +α) of the first temperature range (T _S ±α). Then, in S6, it is checked whether the room temperature T is equal to or higher than the operating temperature _Tc .
If the operating temperature T _C has not been reached, the operating temperature T _C is the lower limit temperature (T _{S −α) of the first temperature range (T S ±} α).
Set to . Then, in S7, it is checked whether the room temperature T is higher than the operating temperature _Tc . If you have not reached
Since it is necessary to raise the room temperature T, at S8
Check the state of the UP flag in RAM flag area R4. If the UP flag has not yet been set to 1, set it to 1 and
Clear the DW flag of R5 to 0. Also, the controlled variable variable HV is increased by 1. Then, if the controlled variable variable HV after increasing in S9 is 3 or more, the controlled variable variable
After setting HV to the maximum value of 3, drive output processing of S5 is performed.

If the controlled variable variable HV after increasing in S9 is the third end, that is, 2, the operating temperature T _C is set to the lower limit temperature (T _S −β) of the second temperature range (T _S ±β), and S10
Check whether the room temperature T exceeds the operating temperature T _C. If it exceeds, the current room temperature T is ( _TS −
Since it is between β) and (T _S −α), the drive output process of S5 is executed with the control variable variable HV kept at 2.
If the room temperature T is below the lower limit temperature (T _S - β) in S10, the controlled variable variable HV is forcibly set to 3, and then S5
Proceed to.

If the UP flag has already been set to 1 in S8, there is no need to increase the controlled variable variable HV.
The operating temperature T _C is set to the lower limit temperature (T _S −β) of the second temperature range (T _S ±β), and the process proceeds to S10.

Also, at S7, the room temperature T falls within the first temperature range (T _S ±
If the lower limit temperature (T _S −α) of α) is exceeded,
Execute the drive output processing of S5 without doing anything.

Also, at S6, the room temperature T falls within the first temperature range (T _S ±
If the temperature is higher than the upper limit temperature (T _S +α) of α), it is necessary to lower the room temperature T, so it is checked in S11 whether the DW flag is set to 1. If it is not yet set to 1, it is set to 1 and the other UP flag is cleared to 0, and then the controlled variable variable HV is subtracted by 1. Then S12
If the controlled variable variable HV after subtraction becomes 1 or less, the controlled variable variable HV is set to 1, which corresponds to [weak], and the drive output process of S5 is performed.

If the controlled variable variable HV after subtraction in S12 has not reached 1, that is, is 2, the operating temperature T _C is the upper limit temperature (T _{S + β) of the second temperature range (T S ±} β).
Set to . If the room temperature T exceeds the upper limit temperature (T _S +β) in S13, the controlled variable variable HV
Forcibly set to 1 and proceed to S5. In addition, if the room temperature T is less than the upper limit temperature (T _S + β) in S13, the control variable variable HV is subtracted by 1, that is, 2
Execute the drive output process in S5 while maintaining the state.

Furthermore, if the DW flag has already been set to 1 in S11, there is no need to subtract the controlled variable variable HV, so the operating temperature T _C is set to the second temperature range (T _S ±
Set the upper limit temperature (T _S +β) of β) and proceed to S13.

In the air conditioner temperature control device configured as described above, when the oil fan heater is started when the room temperature T is sufficiently lower than the set temperature T _S , the set temperature T _S in the set temperature range R2 of the RAM and the setting of the temperature setting device 3 are changed. Since the temperature is significantly different from the temperature T _N , as shown in Figure 7, the temperature control is set to [strong] until the room temperature T reaches the lower limit temperature (T _N -γ) of the third temperature range (T _N ±γ). This third temperature range (T _N ±γ)
When the temperature reaches the inside, the temperature control amount changes to [Medium]. Then, when the room temperature T reaches the new set temperature T _N , the RAM set temperature T _S changes to the new set temperature.
Rewritten to T _N. Therefore, in this state, the room temperature T matches the set temperature T _S .

From this state, when the room temperature T exceeds the upper limit temperature (T _S +α) of the first temperature range (T _S ±α), the temperature control amount changes from [medium] to [weak], and the lower limit temperature (T _S - When it falls below α), it changes from [weak] to [medium] or from [medium] to [strong]. From then on, each time the room temperature T exceeds the upper limit temperature or the lower limit temperature, the room temperature T
The temperature control amount moves by one step in a direction such that the temperature returns to within the original first temperature range (T _S ±α).

Then, as shown in Figure 7, when a window is suddenly opened, the room temperature T falls below the lower limit temperature of the first temperature range (TS _- α), and the temperature control amount increases by one step. Nevertheless, when the room temperature T falls below the lower limit temperature (T _S -β) of the second temperature range, the temperature control amount is forcibly set to [strong]. Therefore, the room temperature T returns not only to the second temperature range but also to the first temperature range in the shortest possible time.

Furthermore, as shown in Fig. 8, even though the room temperature T exceeds the upper limit temperature ( _TS + α) of the first temperature range and the temperature control amount decreases by one step, the room temperature T becomes lower than the second temperature. If the upper limit temperature of the range ( _TS + β) is exceeded, the temperature control amount is forcibly set to [weak]. As a result, the room temperature T returns to within the first temperature range (T _S ±α) in the shortest possible time.

In this way, the first and second temperature regions with different temperature widths are provided, and the room temperature T is in the first temperature region (T _N ±
α) If the temperature control amount is
By moving the temperature by 1 in the direction of returning to the temperature _range of
It can be only points. Therefore, the 10th
It is possible to prevent the temperature from becoming two stable points as in the conventional device shown in the figure, and it is possible to always maintain the room temperature T at one set temperature T _S despite changes in the temperature of the outside air.

Furthermore, the room temperature T is within the second temperature range (T _S ±β)
If the temperature is outside the range, set the temperature control amount to [Strong] or [Weak] in the direction in which the room temperature T returns to the first and second temperature ranges.
Since the temperature is forcibly set, fluctuations in the room temperature T due to disturbances can be suppressed to a minimum.

Furthermore, by controlling the temperature control amount in three stages, the hysteresis of the room temperature T can be reduced, so fuel consumption can be suppressed.

Furthermore, in the embodiment, when starting or when changing the set temperature, the temperature control amount is set to [strong] until the room temperature T enters the third temperature range (T _N ±γ) regarding the new set temperature T _N. ] or [Weak], the room temperature T can be shifted to the new set temperature T _N in a short time.

Note that the present invention is not limited to the embodiments described above. In the embodiment, the present invention is applied to temperature control of a heater such as an oil fan heater, but it can also be applied to a cooler or other air conditioner.

[Effects of the Invention] As explained above, according to the present invention, the temperature control amount is controlled to be switched in three stages, and two types of temperature ranges having different temperature widths are set. Therefore, more accurate temperature control can be performed. Also,
Fuel consumption can be reduced and temperature control can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a temperature control device for an air conditioner according to the present invention, Fig. 2 is a block diagram showing a temperature control device for an oil fan heater incorporating an embodiment of the invention, and Fig. 3 is a block diagram showing a temperature control device for an oil fan heater incorporating an embodiment of the invention. Circuit diagram, 4th
The figure shows the memory contents of the temperature control device, Figures 5 and 6 are flow charts showing the operation of the temperature control device, and Figures 7 and 8 are temperature characteristic diagrams showing the operation of the temperature control device. , FIG. 9, and FIG. 10 are temperature characteristic diagrams showing the operation of a conventional temperature control device. 3...Temperature setting device, 4...Temperature sensor, 11...
...Microcomputer, 13, 14, 15, 1
6...Relay, 13a, 14a, 15a, 16a
... Relay contact, 18 ... Combustion motor, 19,
20...Solenoid, 21...Ignition transformer, 2
2...Fan motor.

Claims (1)

[Claims] 1 The temperature control amount for heating or cooling the room can be set to three levels: strong, medium, and weak, depending on the temperature difference between the room temperature detected by the temperature sensor and the set temperature set by the temperature setting device.
In a temperature control device for an air conditioner that performs switching control in stages, a first temperature range having a predetermined first temperature width centered on the set temperature; temperature range setting means for setting a second temperature range having a second temperature width wider than the second temperature range; and when the detected room temperature is outside the second temperature range, the temperature control amount is set to coarse temperature adjustment means for controlling the temperature to a strong or weak level depending on the direction in which the temperature falls within a second temperature range; 1. A temperature control device for an air conditioner, comprising: fine temperature adjustment means for moving the temperature control amount by one step in the direction of entering the temperature range.