JPS62190345A - Operation control unit of air conditioner - Google Patents

Abstract

PURPOSE:To shorten the time between the stoppage of a compressor and resumption of the operation by suspending the shiftup of a stable zone wherein a compressor is operated at a low rotational speed when the gradient of the room temperature varies to a side away from a set value. CONSTITUTION:The unit is provided with temperature gradient variation detection means 6 capable of detecting a gradient variation in which the room temperature exceeds a set value for stopping the rotation of a compressor 12 and further the gradient of the room temperature varies to a value away from the set value of setting means 1. By an output from the detection means 6, shiftup suspension means 9 for suspending the shiftup of that stable zone among a plurality of zones, where a compressor 12 is rotated at a low speed is operated to shorten the time from the stoppage of the compressor 12 to the re-operation thereof. By these procedures, it is possible to increase the control precision of the air conditioner and also possible to carry out the comfortable operation control.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an operation control device for an inverter type air conditioner.

(Prior Art) Conventionally, this type of air conditioner operation control device includes a compressor whose rotation speed can be controlled, and sets the rotation speed of the compressor to a predetermined setting value set by a setting means. The room temperature detection means, for example, is controlled according to the temperature difference from the room temperature detected by an indoor thermostat, and the range of change in the temperature difference between the room temperature and the set value is divided into a plurality of zones, and the temperature is controlled according to the temperature difference between the room temperature and the set value. While controlling the rotation speed of the compressor, when the slope of the room temperature change changes to the side away from the set value, that is, for example, when the change in the room temperature changes from a downward slope to an upward slope during cooling, Each of the zones is amplified by shifting, for example, one rank to the side where the rotational speed increases.

When the rotational speed of the compressor is controlled by the operation control device, the temperature difference between the room temperature detected by the thermostat and the set value set by the setting means is as shown in FIG. An off position is set in which the thermostat is turned off when the temperature is O'C, and a stop zone (A
), and set an on position where the thermostat is turned on in a region where the temperature difference exceeds 0°C, and between this on position and the off position, the compressor is turned on at 30 Hz. Stable zone of slow rotation at frequency (
B), and this stability zone CB) has a width of 1°C to ensure stable operation of the compressor. In the area where the above temperature difference exceeds 0.5°C
The temperature range is divided into zones (C) to (F), and each zone CC') to (F) has a temperature range of 40 to 70%.
The compressor is rotated at high speed at a frequency of Hertz.

Thus, at the start of operation of the n;J compressor, each of the zones (F) to (C ), the compressor is rotated at high speed at a frequency corresponding to each zone (F) to (C), the temperature difference gradually decreases, and the temperature gradient curve of the room temperature becomes a downward slope,
Also, due to the rotation of the compressor, the curve changes to the zone (B
) to a point (a) where it intersects the off position of the thermostat, the operation of the compressor is stopped by the off operation of the thermostat, the curve reaches the stop zone (A), and then the As the compressor stops operating, the room temperature gradually increases, and when it crosses the inflection point (B) of the curve, it becomes an upward slope, and the room temperature rises between the stop zone (A) and the stability zone (B). ), when the point (c) intersects with the ON position of the thermostat, the operation of the compressor is restarted by the ON operation of the thermostat, the curve becomes downward slope again, and the compressor It is operated in the stability zone (B).

Further, in the operation control device, when the temperature gradient curve changes from a downward slope to an upward slope in each of the zones (A) to (F) described above, the temperature gradient curve changes from a downward slope to an upward slope in each of the zones (A) to (F). It is as if the curve is shifted up by one rank to the side that increases the number, and by doing so, when the curve is located in each of the zones (A) to (F),
When the curve changes from a downward slope to an upward slope, each of the zones (A) to (F) is shifted up by one rank, and the compressor is rotated at a constant rotation speed from the current rank to the next higher rank. The compressor is rotated to prevent hunting from occurring in the compressor.

That is, when the air conditioner is operated, when the load on the indoor side increases due to opening a window, the temperature gradient curve is located in each zone (F) to (C). However, in some cases, the slope changes from a downward slope to an upward slope, but in this case, the curve changes to a downward slope again due to the removal of the load, etc. In such cases, the rotation speed of the compressor is changed to Each zone (F) ~ (C
), hunting will occur in the compressor. Therefore, in such a case, each zone (F) to (C) is shifted up by one rank to the rotational speed increasing side, and the compressor is rotated to the next rank at the currently operating rotational speed to prevent hunting of the compressor.

(Problems to be Solved by the Invention) However, in the operation control device for an air conditioner as described above,
When the temperature gradient curve changes, for example, from a downward slope to an upward slope during cooling, all of the zones (A) to (F) are lifted up, for example, by one run, to the side where the rotational speed increases, resulting in the following problem. There it was.

That is, when the temperature gradient curve changes from a downward slope to an upward slope in the cooling stop zone (A), for example, when the temperature gradient curve changes from a downward slope to an upward slope in the cooling zone (A), that is, when the temperature gradient curve changes from the above-mentioned thermostat point (A) to the inflection point (B), When the slope changes to an uphill slope, the stable zone (B) is also shifted up like the other zones, so the thermostat on point (c) is at the thermostat on position set above (7f1 degree difference 1.0°C).
) is shifted up to the upper side (temperature difference 1.5°C), and therefore the off point of the thermostat (A) is shifted up.
The compressor stop time from to the on point (c) becomes long, that is, the time from when the compressor is stopped by turning off the thermostat until it is restarted by turning on the thermostat becomes long, and the air conditioning There were problems such as a decline in the control accuracy of the aircraft and a lack of comfort.

The present invention was invented in view of the above-mentioned problems, and its purpose is to set the temperature gradient curve when the temperature gradient curve changes from a downward slope to an upward slope during cooling in the above-mentioned stop zone, that is, the slope of room temperature change is set. If the value changes away from the value, by stopping the upshift in the stability zone, the time from when the compressor is stopped by turning off the thermostat to when it is restarted by turning on the thermostat can be reduced. In short, it is an object of the present invention to provide an operation control device that can improve the control accuracy of the air conditioner and perform comfortable operation control.

(Means for Solving the Problems) The operation control device of the present invention is configured as shown in FIGS. 1 to 3, and has a compressor (12
), and the rotation speed of the compressor (12) is controlled according to the temperature difference between the room temperature detected by the room temperature detection means (2) and the set value set by the setting means (1). At the same time, the range of change in the temperature difference between the room temperature and the set value is divided into a plurality of zones, and the compressor (12) is controlled to a rotation speed corresponding to each zone, while the gradient of the room temperature change is divided into a plurality of zones. When the room temperature changes away from the set value, the room temperature exceeds a set value that stops the rotation of the compressor (12) in the operation control HC that shifts the zone to the higher rotation speed side; and temperature gradient change detection means (6) for detecting a gradient change in which the gradient of room temperature change moves away from the set value; and this detection means (6).
The present invention is characterized by comprising a shift-up halting means (9) for halting a shift-up in a stable zone in which the compressor (12) is set to a low rotational speed in the zone using an output from the compressor (12).

(Function) For example, during cooling, when the gradient of the room temperature change changes from a downward gradient to an upward gradient beyond the set value for stopping the operation of the compressor (12), the gradient of the room temperature change is relative to the set value. When the temperature gradient changes to the away side, the change in the temperature gradient is detected by the temperature gradient change detection means (6), and the shift-up stop means (9) is operated by the output signal output from the detection means (6). Therefore, the lift-up in the stability zone located at the point exceeding the set value is stopped, and by doing so, the time from when the compressor (12) is stopped until it is restarted is shortened. It is.

(Example) The operation control device for an air conditioner according to the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows a block diagram of the operation control device, in which a setting means (1) for setting set values, a heating means (2) for detecting room temperature, for example a thermostat (2), and a temperature difference detecting means (2) are connected to each other. 3), and a rotation speed calculating means (4) is connected to the output side of the temperature difference detecting means (3), while this calculating means (4) and the temperature difference detecting means (3) Temperature difference storage means (5) is interposed between the two.

Further, between the temperature difference detection means (3) and the calculation means (4), a change in the room temperature gradient is detected based on the temperature difference between the room temperature detected by the temperature difference detection means (3) and a set value. At the same time, a storage means (7) for each zone, which will be described later, is connected to the input side of the rotational speed calculation means (4).

A shift-up means (8) and a shift-up cancel means (9) are connected to the output side of the calculation means (4), and each of the shift-up means (8) and shift amplifier cancel means (9) is connected to the output side of the calculation means (4). Output frequency command means (10
), and a compressor (12) is connected to the output side of this command means (10) via a frequency converter (11).

Next, FIG. 2 shows how the compressor (12) is controlled during cooling according to the temperature difference between the setting value set by the setting means (1) and the room temperature detected by the thermostat (2). The explanation will be based on.

First, the room temperature detected by the thermostat (2),
The temperature difference from the set value set by the setting means (1) is 0.
A stop zone (A) is set in which an off position is set in which the thermostat (2) is turned off when the temperature is °C, and the area below this off position is where the operation of the compressor (12) is stopped.
At the same time, an on position for turning on the thermostat (2) is set in a region where the temperature difference exceeds O''C, and between this on position and the off position, the compressor is turned on. A stable zone (B) is formed in which the compressor (12) is rotated at a low speed of 30 hertz, and this stable zone (B) has a width of 1°C to ensure stable operation of the compressor (12). On the other hand, in the region beyond the stable zone (B) and beyond the ON position of the thermostat (2), the temperature difference is carved into a temperature width of 0.5°C to create a zone (
C) to (F), and in each zone (C) to (F), the compressor (
12) by rotating it at high speed.

When the temperature gradient curve shown in the figure is located in the stop zone (A) and the temperature difference between the room temperature and the set value is O''CC or less, the room temperature changes from a downward slope to an upward slope. , the output signal from the shift-up canceling means (9) causes the shift-up of the stable zone (B) to be canceled without up-shifting the stable zone (CB), and the temperature difference is 1.0°C. When the temperature gradient curve is located in the zones (C) to (F) in a region exceeding
), the rotational speed of the compressor (12) is increased by, for example, one rank.

By doing so, at the start of operation of the compressor (12), as shown in the temperature gradient curve in the same figure, the temperature is increased in each zone (F) to (C) according to the temperature difference. ) to (C) at frequencies corresponding to the compressor (12).
is rotated at high speed, the temperature difference gradually decreases, and the temperature gradient curve becomes a downward slope.
Further, when the temperature gradient curve reaches the off point (A) from the zone (B) to intersect with the off position of the thermostat (2) due to the rotation of the compressor (12), the thermostat (2) is turned off. The compressor (12
) is stopped and the temperature gradient curve reaches the stop zone (A).

Thereafter, as the compressor (12) is stopped, the temperature difference gradually increases, and when the temperature gradient curve exceeds the inflection point (b), it becomes an upward slope, and the temperature difference increases. When the stop zone (A) and the stability zone (B) reach the ON point (C) that intersects the OFF position of the thermostat (2), the compressor (12) is turned on by the ON operation of the thermostat (2). operation will be resumed. With this restart, the temperature gradient curve becomes downward slope again and the compressor (12) operates in the stability zone (B).

Therefore, the temperature gradient curve is different from the zone (F) to (C
), when the slope changes from a downward slope to an upward slope, each of the zones (F) to (C) increases the rotational speed of the compressor (12) by one lantern. The compressor (12) is rotated at a constant speed from the current rank to the next higher rank, and the temperature gradient curve reaches the stop zone (A). When the slope changes from a downhill slope to an uphill slope, the stability zone CB) becomes 7.
The thermostat (2) without being futoanopped
The on-point (/\) of is located above the thermosk and to-off position (tQ degree difference 1.0'C) set above, and therefore the stop time of the compression m(12), that is, the off-point The time from (a) to the on point (c) is shortened, and a comfortable temperature is achieved.

Next, the control mode of the operation control device will be explained based on the flowchart of FIG. 3.

First, after starting the operation of the air conditioner, the setting means (1) sets the set value of the room temperature, that is, the thermostat 7.
) (2), and by doing so, the temperature difference detection means (3) and the calculation means (4) are set.
), it is determined whether the room temperature is equal to or less than the set value by the setting means (1), and if the answer is yes, that is, if the room temperature is equal to or less than the set value, the compressor (12) is Operation will be stopped.

If the answer is no, that is, if the room temperature is higher than the set value, it is determined whether the thermostat (2) is in an OFF state, that is, whether the compressor (12) is currently in a stopped state. If the determination is YES, that is, when the compressor (12) is in a stopped state, the rotational speed of the compressor (12) is shifted up by an output signal from the shift-up stop means (9), as described later. If no, the compressor (12) is stopped.
When the compressor (12) is in operation, the calculation means (4) uses the output signal from the temperature gradient change detection means (6) to calculate the previous time of the compressor (12) stored in the zone storage means (7). It is compared and determined whether the temperature of the current operation zone is high with respect to the operation zone, that is, it is determined whether the temperature gradient curve described above has exceeded the inflection point (b), and if the result is no; In other words, when the temperature of the current operating zone is lower than that of the previous zone, it is assumed that the temperature gradient curve is on a downward slope, and the shift-up means (
8), the rotational speed of the compressor (12) is shifted in accordance with the current zone, and the compressor (12) is operated in this shift zone.

Further, in the case of YES, that is, when the temperature of the current operating zone is higher than that of the previous zone, the temperature gradient curve crosses the inflection point (B) and becomes an upward slope, and the temperature gradient curve becomes the stop point. 1 in the stable zone (B) without upshifting the rotational speed of the compression 1 (12) due to the output signal from the shift amplifier stop means (9). The rank shift up is stopped, and then it is determined whether the room temperature is equal to or higher than the ON temperature set by the thermostat (2), and if YES, that is, the room temperature is equal to or higher than the ON temperature. When this happens, an operation command is output from the command means (11) to the compressor (12), and when the answer is no, that is, when the room temperature becomes equal to or lower than the on-temperature, the above-described control is repeated.

(Effects of the Invention) As explained above, in the air conditioner operation control device according to the present invention, the room temperature exceeds the set value for stopping the rotation of the compressor (12), and the gradient of the room temperature change is set by the setting means (12). Temperature gradient change detection means (θ) is provided that is capable of detecting a gradient change in the direction away from the setting value set in step 1), and the output from this detection means (6) determines which of the plurality of zones the compression Since the shift-up canceling means (9) for stopping the shift-up in the stable zone where the compressor (12) is set to a low rotational speed is provided, the time from when the compressor (12) is stopped until it is restarted can be shortened. As a result, the control of the air conditioner can be increased by 1.7 degrees, and comfortable operation control can be achieved.

[Brief explanation of drawings]

Figure 1 is a professional diagram showing the operation control device of the present invention;
The figure is an explanatory diagram illustrating the control mode of the compressor according to the temperature difference between the room temperature and the set value, FIG. 3 is a flowchart diagram of the operation control device, and FIG. 4 is an explanatory diagram illustrating a conventional example. (6)...1111 Temperature gradient change detection means (9)...
・1 lift-up stop means (12)... Compressor 1st section Fig. 2 Fig. 4

Claims (1)

[Claims] (1) Equipped with a compressor whose rotation speed can be controlled, the rotation speed of the compressor is controlled according to the temperature difference between the room temperature and the set value, and the range of change in the temperature difference between the room temperature and the set value is controlled in multiple ways. The compressor is divided into zones, and the compressor is controlled to a rotation speed corresponding to each zone, and when the gradient of room temperature change moves away from the set value, the zone is controlled to increase the rotation speed. Temperature gradient change detection for detecting a gradient change in which the room temperature exceeds a set value for stopping the compressor and the gradient of the room temperature change moves away from the set value in an operation control device configured to shift up. means (6), and shift-up canceling means (9) for canceling shift-up in a stable zone in which the compressor is at a low rotational speed in the zone based on the output from the detection means (6). An air conditioner operation control device characterized by: