JPH0415445A - Method of controlling multi-room type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for controlling a multi-room air conditioner.

(Prior Art) In a conventional multi-room air conditioner that consists of one outdoor unit equipped with an inverter-driven compressor and multiple indoor units installed in multiple rooms, each room has its own temperature and temperature control system. The heating and cooling capacity required by each indoor unit, that is, the required capacity for each room, is calculated by calculating the deviation E from the set temperature using PTD, and the operation obtained by combining the required capacities for each room. The frequency was used to drive an inverter-driven compressor.

(Problems to be Solved by the Invention) In the conventional control method described above, when the deviation E occurs, even if it is small, the required capacity changes, resulting in lack of control stability. Furthermore, even if the deviation E is large, the frequency cannot be changed over a wide range, resulting in lack of control coordination.

It is not possible to keep up with changes in distribution capacity based on starting or stopping some indoor units among the plurality of indoor units.

For this reason, as shown in FIG. 6 during cooling operation and as shown in FIG. 7 during heating operation, the inverter-driven compressor repeatedly starts and stops, resulting in a problem of large changes in room temperature.

Further, since the control coefficients for PID calculation vary depending on the indoor unit model, there is a problem that the control system cannot be unified or simplified.

(Means for Solving the Problems) In view of the above, the present invention aims to provide a control method that is resistant to external disturbances, has a long continuous operation range, and can stabilize room temperature, and its gist is as follows: The above-mentioned inverter-driven compressor is applied to a control method for a multi-room air conditioner in which a plurality of indoor units installed in a plurality of rooms are connected in parallel to one outdoor unit equipped with an inverter-driven compressor. The operating frequency of the inverter-driven compressor is determined by calculating the required frequency for each chamber and combining these required frequencies for each chamber. A method for controlling a multi-room air conditioner, characterized in that the required frequency is increased or decreased so as to approach zero, and the required frequency is not changed when E is zero and ΔT is zero.

(Example) An example of the present invention will be specifically described with reference to FIGS. 1 to 5.

A control block diagram is shown in FIG.

The room temperature Ta+fnl at an arbitrary sampling time (n) detected by the room temperature sensor 1 that detects the room temperature of the first room is input to the room temperature storage means 2 and stored there, and at the same time, the subtractor 3
is input to the set temperature sp, which is arbitrarily set in the room temperature setting device 10, and the deviation E+ between these is determined.
+I11 (-3P1-Ta+tn+) is calculated. Furthermore, this room temperature Ta1 is manually entered into the subtractor 4 and input from the room temperature storage means 2 at the time of previous pulling (n
The temporal change rate ΔT++n+ of the room temperature is calculated by comparing it with the room temperature Tal+n-11 of -1). This temporal rate of change ΔT+ +11+ and the deviation E1,1 are input to the fuzzy calculation means 5, where fl(.) is calculated to increase the required frequency based on the control rule input from the control rule storage means 10 .

The control rule storage means 10 stores the heating control rules shown in Table 1 and the cooling control rules shown in Table 2.

Rule l IF Rule 2 IF Rule 3 1F Rule 4 1F Rule 5 1F Rule 5 1F Rule 7 1F Rule 8 1F Rule 9 1F Rule 10 1F Rule 11 1F Rule 12 IF Rule 13 1F Table 1 E=NB, ΔT=PB E=NBΔT=ZO E=NS, ΔT=PS E-NS, ΔT=ZO E,, NS, ΔT=NS E=zo, ΔT=PB E40ΔT=PS E=zo, ΔT=ZO E=zo, ΔT=NS E=zo, ΔT=NB E-psΔT-PS E=ps, ΔT=ZO E=PSΔT=NS THEN THEN TIIEN THEN Tl(EN THEN T H E N THEN THEN THF. N THEN T)IEN THEN Δf=NB Δf-NB Δf=NS Δf-NS Δf40 Δf=NB Δf=Ns Δf40 Δf-PS Δf work PB Δf=Z.

Δf=Ps Δf=Ps Rule 14 IF E=PB, ΔT-ZO TH
EN Δf=PB rule 15 IF E-PB,
ΔT=NB THEN Δf=PR Table 2/L/-rut IF B=NB, ΔT=PB T
HEN Δf=PBJl/Rule2 IF E=N
B. ΔT=ZO THEN Δf-PR rule 3
IF E=NS, ΔT=PS THEN Δf
=PS rule 4 IF E=NS, ΔT=ZO
THEN A f=Ps Rule 5 1F B=N
S, ΔT=NS THEN Δf=Z.

Rule 6 IF E-ZO, ΔT=PB THE
N Δf-PR rule 7 1F B=ZOΔr=
ps THEN Δf=PS Rule 8 IF
E=ZOΔT=ZO TIIEN Δf=ZO Rule 9 IF E=ZO, ΔT=NS THEN
Δf=NS rule 10 IF E=ZO, ΔT=
NB THEN Δf=NB Rule 11 1F
B=PS, ΔT−PS THEN Δf=Z.

Rule 12 IF E=PS, ΔT=ZO rl
lENΔf. NS Rule 13 1F B=PS
, ΔT=NS THEN Δf=NS Rule 14
IF E=PB, ΔT=ZO T) IEN Δ
f=NB Rule 15 IF E=PB, ΔT=NB
THEN A f=NB This frequency increment Δf+f
nl is input to the defuzzification quantization means 6 and is quantized there. The output ΔFIL, . -1
, the required frequency F1.1 is calculated by adding the required frequency F,. , operating frequency calculation means 9
is input.

Similarly, the required frequencies F2 to Fl are applied to the second to mth chambers, respectively. , is calculated and input to the operating frequency calculation means 9.

The operating frequency calculation means 9 calculates these required frequencies F1,1
Or Fo. , the operating frequency F(
n) is calculated, and the inverter-driven compressor is driven by this operating frequency F (7°).

A slight deviation E between the room temperature Tag of any room among the plurality of rooms (1 to m), for example, the first room, and the set temperature SPx+.
FIG. 2 shows the process of calculating the control amount ΔFx+ when there is x + and the +0 time rate of change is ΔTKI.

In this case, rules 8 and 12 are used, and in rule 8, the rate at which EKl is 20 is evaluated as 0.7, and the rate at which ΔTKI is Zo is evaluated as 1.0. Rule 12 says EKI
The ratio that is ps is evaluated as 0.3, and the ratio that ΔTK1 is ZO is evaluated as 1.0. From this evaluation, the suitability ω8 of rule 8 and the suitability ω12 of rule 12 are determined by the following equations.

ω8 = 0.7 to 1.0 = 0.7 ω1□-0,3 to 1.0 = 0.3 /l spelling In rule 8, ΔF is ZO, and in rule 12, ΔF is ps. This degree is evaluated by fitness, and the output ΔF of both rules is
ΔfKI is the synthesized product. Output ΔFKI is Δf0
is given by the center of gravity of

In Fig. 2, the upper row shows the flow of rule 8, the lower row shows the flow of rule I2, and the peaks from the left indicate EKI, Δ
The evaluation function of Δf□ in TK is shown, the inner peak of ΔfKl shows ΔfKI evaluated by the fitness of each rule, and the rightmost peak shows the composite of the output distributions of both rules.

In this way, the frequency increment ΔfKl is calculated from the deviation EK and the temporal rate of change ΔTKl of the room temperature, and the actual increment ΔF
KI is reduced by taking the center of gravity of ΔfKl.

Therefore, the force that tries to maintain stability against small changes is strong, and the stability of control is improved.

Next, there is a large deviation Exz between the room temperature TiK+ and the set temperature 5PKI, and the time rate of change is Δ
The calculation process for TK2 is shown in FIG.

In this case, rule 3.4.2 is used and the deviation EK2
The frequency increment ΔfK□ is calculated from the time change rate ΔTK2 and the actual increment becomes ΔFK2.

Therefore, if the deviation EX□ exceeds a certain value, FX2 increases to the control amount, and the coordination of control improves.

(Then, when E is not zero, and when E is zero and ΔT is positive or negative, that is, when control rules 1 to 7.9 to 15 are met, the required frequency ΔF is increased or decreased so that E approaches zero, E
When is zero and ΔT is zero, that is, when control rule 8 is met, the required frequency ΔF is controlled to be zero so as to maintain this state.

(Thus, the changes in compressor operating frequency and room temperature during cooling operation are as shown in Figure 4, and the changes in compressor operating frequency and room temperature during heating operation are as shown in Figure 5. , and the fluctuations in room temperature are reduced compared to the conventional ones shown in FIGS. 6 and 7.

(Effect of the invention) The required frequency for the impark drive compressor is calculated by fuzzy theory based on the above, and the required frequency for each chamber is combined to determine the operating frequency of the inverter driven compressor, and E is not zero. When time and E are zero and ΔT is positive or negative, the required frequency is increased or decreased so that E approaches zero, and when E is zero and ΔT is zero, the required frequency is controlled so as not to change. (1) For each room, the influence of changing the set temperature of other rooms or starting/stopping other rooms can be reduced, and therefore stable continuous operation can be performed.

(2) Since it can quickly respond to disturbances and various fluctuations, it is possible to operate resistant to disturbances and various fluctuations.

(3) The same control rules and control variables can be used regardless of differences in models or operating modes such as cooling or heating, and therefore the control system can be unified and simplified.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a control block diagram, FIG. 2 is an explanatory diagram showing the calculation process when the deviation E is zero, and FIG. 3 is an explanatory diagram showing the calculation process when the deviation E is zero. An explanatory diagram showing the calculation process when the temperature is large. Figure 4 is a diagram showing the temporal changes in the compressor frequency and room temperature during cooling operation. Figure 5 is a diagram showing the temporal changes in the compressor frequency and room temperature during heating operation. FIG. FIGS. 6 and 7 are diagrams showing temporal changes in compressor frequency and room temperature of a conventional multi-room air conditioner, with FIG. 6 showing during cooling operation and FIG. 7 during heating operation, respectively. Room temperature sensor 1, room temperature setting device-40, deviation E calculation means-3, time rate of change T calculation means-4, fuzzy calculation means-5, control rule storage means-10, operating frequency calculation means-9

Claims (1)

[Claims] In a method for controlling a multi-room air conditioner in which a plurality of indoor units installed in a plurality of rooms are connected in parallel to one outdoor unit equipped with an inverter-driven compressor, By calculating the required frequency for the inverter-driven compressor using fuzzy theory based on the deviation E between the room temperature and its set temperature and the temporal rate of change ΔT of the room temperature, and combining these required frequencies for each room. Determine the operating frequency of the above inverter-driven compressor, and when E is not zero and when E is zero, Δ
A control method for a multi-room air conditioner, characterized in that when T is positive or negative, the required frequency is increased or decreased so that E approaches zero, and when E is zero and ΔT is zero, the required frequency is not changed.