JPH0447219B2 - - Google Patents

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, an operation control device for this type of air conditioner is capable of controlling the rotation speed of a compressor, and the rotation speed of the compressor is set by a predetermined setting value set by a setting means and by room temperature detection. For example, the temperature is controlled according to the temperature difference between the room temperature detected by an indoor thermostat, and the temperature difference between the room temperature detected by the thermostat and the setting value set by the setting means is 0°C.
An off position is set in which the compressor is stopped by turning off between the thermostat and the compressor when the following conditions occur, and a stop zone is set in an area below this off position to stop the operation of the compressor. A, and when the room temperature exceeds the set value and reaches a predetermined temperature with respect to this set value, the temperature between the thermostat and the compressor is changed from the state in which the compressor is stopped by the off operation. setting an on position in which the compressor is restarted by turning it on, and forming a stability zone B between the on position and the off position in which the compressor rotates at a low speed at a frequency of 30 hertz; This stability zone B has a width of 1°C to ensure stable operation of the compressor, while in a region beyond the stability zone B and beyond the ON position of the thermostat, the temperature difference is Multiple zones C to F, divided into temperature ranges of 0.5℃
and in each zone C to F, 40
The compressor is rotated at high speed at a frequency of ~70 hertz to control the rotation speed of the compressor. Further, when the compressor is restarted by the ON operation of the thermostat, the compressor operates at a frequency of 40 Hz in the zone C, which is a higher rotation speed than the 30 Hz frequency operation in the stable zone B. This structure speeds up the transition from an uphill slope to a downhill slope, so that driving within the stable zone B can be performed quickly.

Further, when the slope of the room temperature change changes to the side away from the set value, that is, when the change in the room temperature changes from a downward slope to an upward slope during cooling, for example, when the slope of the room temperature change changes from a downward slope to an upward slope, each zone B to F is set to the air temperature and the set value. On the side where the range of change in the temperature difference from the value increases, the rotational speed remains the same and is shifted up by one rank, for example.

Thus, when the rotation speed of the compressor is controlled by the operation control device, when the compressor starts operating, the room temperature and the set value are adjusted as shown in the temperature gradient curve of the room temperature shown in FIG. According to the temperature difference between each zone F to C in each zone F to C,
The compressor is rotated at high speed at a frequency corresponding to
As the temperature difference gradually decreases, the temperature gradient curve of the room temperature becomes a downward slope, and the rotation of the compressor causes the curve to move from the zone B to the point A where the off position of the thermostat intersects. When the thermostat reaches OFF, the operation of the compressor is stopped, and the curve reaches the stop zone A, and after that, the room temperature gradually increases due to the stoppage of the compressor. When the curve exceeds the inflection point B, the temperature becomes upward slope, and the room temperature reaches the stable zone B from the stop zone A, and when it crosses the point C, which intersects the ON position of the thermostat, the temperature rises. The operation of the compressor is restarted by turning on the thermostat, and the curve slopes down again, and the compressor 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, the range of change in temperature difference between the air temperature and the set value in each of the zones B to F is In this way, when the curve is located in each of the zones A to F and the curve changes from a downward slope to an upward slope, each of the above-mentioned Zones B to F are shifted up one rank to rotate the compressor at a constant rotation speed from the current rank to the next higher rank to prevent hunting from occurring in the compressor. are doing.

That is, when the air conditioner is operated, when the load on the indoor side increases due to opening a window, even if the temperature gradient curve is located in each zone F to B, The slope may change from slope to upward slope, but at this time, the curve changes to downward slope again due to the removal of the load, etc. In such a case, the rotation speed of the compressor is changed in each zone F to If the rotational speed of the compressor is varied in accordance with B, hunting will occur in the operation control of the compressor. ~C is shifted up one rank to the side where the range of change in temperature difference between the air temperature and the set value increases, and the compressor is rotated to the next rank at the currently operating rotation speed, and the compressor is This is to prevent hunting in the operation control.

(Problem to be Solved by the Invention) By the way, in the operation control device for an air conditioner as described above, when the temperature gradient curve changes from a downward slope to an upward slope during cooling, for example, each of the zones B to
Since all of F are shifted up, for example, by one rank, to the side where the change in temperature difference between the air temperature and the set value increases, the following problem occurs.

That is, the temperature gradient curve is
For example, when the slope changes from a downward slope to an upward slope during cooling, that is, when the above-mentioned thermostat off position A changes to an upward slope centering on the inflection point B, the stable zone B is also shifted up like the other zones. Therefore, the on position of the thermostat is shifted up to the upper side (temperature difference of 1.5°C) compared to the thermostat on position (temperature difference of 1.0°C) set above before being shifted up. As the ON position of the thermostat increases, it takes time to restart the operation, and even though the operation is performed at a higher speed than the low speed rotation in the stability zone B, when the thermostat is restarted due to the ON operation, the OFF operation of the thermostat The compressor has been stopped for a long time from when the compressor is stopped until it is restarted in an ON operation, resulting in a decrease in control accuracy of the air conditioner, resulting in a lack of comfort.

The present invention was invented in view of the above problems, and its purpose is to change the slope from a downward slope to an upward slope during cooling when the room temperature falls below a set value and the compressor is stopped during operation of the compressor. In other words, when the gradient of room temperature change changes away from the set value, the on-position is held constant by stopping the shift-up of the stable zone, and the compressor is turned off by turning off the thermostat. To provide an operation control device that can prevent the time from being stopped until it is restarted in an ON operation to increase the control accuracy of the air conditioner and perform comfortable operation control. There is a particular thing.

(Means for Solving the Problems) The operation control device of the present invention is configured as shown in FIGS. 1 to 3, and includes a compressor 12 whose rotation speed can be controlled. An off position for stopping the compressor 12 when the room temperature exceeds a set value and an on position for restarting the stopped compressor 12 when the room temperature exceeds a set value and reaches a predetermined temperature with respect to this set value. A stable zone B in which the compressor 12 is rotated at low speed is formed between the on position and the off position, and a range of change in the temperature difference between the room temperature and the set value in a region beyond this stable zone B is set in multiple ranges. The rotational speed of the compressor 12 is controlled to be higher than the rotational speed in the stable zone B and corresponding to each zone C to F, and the gradient of room temperature change is In the operation control device, the operation control device is configured such that when the room temperature changes away from the set value, the zones B to F are shifted up to the side where the range of change in temperature difference between the room temperature and the set value increases. Machine 12
temperature gradient change detection means 6 for detecting a gradient change that exceeds the off position and the gradient of room temperature change moves away from the set value after the temperature gradient has stopped;
and shift-up stopping means 9 for stopping the shift-up of the stable zone B when the detecting means 6 outputs the output after the compressor 12 is stopped.

(Function) However, when the room temperature falls below the set value during operation of the compressor and the compressor is stopped, if the gradient of the room temperature change changes from a downward slope to an upward slope during cooling, for example, the room temperature When the gradient of change changes away from the set value and exceeds the off position where the operation of the compressor 12 is stopped, the temperature gradient change detection means 6 detects the change in the temperature gradient. , the shift-up canceling means 9 uses the output signal outputted from the detecting means 6.
is operated to stop shifting up the stability zone beyond the off position, thereby causing the stable zone to shift up with a predetermined differential formed between the off and on positions. Zone B can prevent the compressor 12 from starting and stopping hunting, and when the compressor 12 is restarted, the restart is set to a high speed rotation instead of a low speed rotation set corresponding to the stability zone B. The high speed of rotation in the upper zone C is used to speed up the transition from the upward slope of the room temperature to the downward slope of the room temperature.
While it is possible to quickly approach the set value and quickly operate in the stable zone B, at the time of output from the detection means 6 after the compressor 12 has stopped, the shift-up of the stable zone B is stopped and the operation in the stable zone B is stopped. By keeping the compressor 12 constant, the time from when the compressor 12 is stopped to when it is restarted is prevented from becoming longer due to shift-up, and the time until it is restarted, which has been a problem, can be shortened. As a result, the control accuracy of the air conditioner is improved by the sum total of the above-mentioned effects, and comfortable operation control is performed.

(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 and a room temperature detecting means 2 for detecting the room temperature, such as a thermostat 2, are connected to the input side of a temperature difference detecting means 3. A rotation speed calculation means 4 is connected to the output side of the temperature difference detection means 3, and a temperature difference storage means 5 is interposed between the calculation means 4 and the temperature difference detection means 3.

Further, a temperature gradient change is provided between the temperature difference detection means 3 and the calculation means 4, which detects a change in the room temperature gradient based on the temperature difference between the room temperature detected by the degree difference detection means 3 and a set value. The detection means 6 is connected, and the storage means 7 for each zone, which will be described later, is connected to the input side of the rotation speed calculation means 4.

A shift-up means 8 and a shift-up stop means 9 are connected to the output side of the calculation means 4, and an output frequency command means 10 is connected to each output side of the shift-up means 8 and shift-up stop means 9. A compressor 12 is connected to the output side of the command means 10 via a frequency converter 11.

Next, the control mode of the compressor 12 during cooling according to the temperature difference between the set value set by the setting means 1 and the room temperature detected by the thermostat 2 will be explained based on FIG. .

First, when the temperature difference between the room temperature detected by the thermostat 2 and the set value set by the setting means 1 is 0°C, the thermostat 2 and the compressor 12 are turned off. An off position where the compressor 12 is stopped is set, and a stop zone A where the operation of the compressor 12 is stopped is formed in a region below this off position, and when the room temperature exceeds the set value and reaches this set value. On the other hand, when the temperature reaches a predetermined temperature, the thermostat 2 and the compressor 1 are turned off from the state where the compressor 12 is stopped by the off operation.
The compressor 12 is rotated at a low speed at a frequency of 30 Hz between the on position and the off position to stabilize the compressor 12. forming zone B;
This stability zone B has a width of 1°C to ensure stable operation of the compressor 12, while
Beyond the stability zone B, the thermostat 2
In the area beyond the on position, the temperature difference is 0.5
A plurality of zones C to F are formed by dividing the temperature into a temperature range of 0.degree. It's like controlling the Further, when the compressor 12 is restarted by the ON operation of the thermostat 2, the compressor 12 rotates at a higher frequency than the 40 Hz frequency in the zone C, which is higher than the 30 Hz frequency operation in the stable zone B. The vehicle is configured so that the vehicle can quickly shift from an uphill slope to a downhill slope, so that driving in the stability zone B can be performed quickly.

Further, when the slope of the room temperature change changes to the side away from the set value, that is, when the change in the room temperature changes from a downward slope to an upward slope during cooling, for example, when the slope of the room temperature change changes from a downward slope to an upward slope, each zone B to F is set to the air temperature and the set value. On the side where the range of change in the temperature difference from the value increases, the rotational speed remains the same and is shifted up by one rank, for example.

As described above, in the air conditioner operation control device of the present invention, the temperature difference between the room temperature and the set value is 0° C. or less, and the temperature gradient curve shown in FIG. 2 is located in the stop zone A. When the room temperature changes from a downward slope to an upward slope under the condition that
without shifting up the stability zone B.
In addition, in the region where the temperature difference exceeds 1.0°C, which is the ON position, and the temperature gradient curve is located in the zones C to F, the shift-up means 8 With the output signal, each of the zones C to F is shifted up by one rank, for example, to the side where the range of change in temperature difference between the air temperature and the set value increases, while the rotational speed remains unchanged.

By doing so, when the compressor 12 starts operating, as shown in the temperature gradient curve in the same figure, the frequency corresponding to each zone F to C is adjusted in the region of each zone F to C according to the temperature difference. The compressor 1
2 is rotated at high speed, the temperature difference gradually decreases and the temperature gradient curve becomes a downward slope, and the rotation of the compressor 12 causes the temperature gradient curve to change from the zone B to the zone B. When the thermostat 2 reaches the off point A, which intersects the off position of the thermostat 2, the thermostat 2 is turned off, the operation of 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 becomes larger in the stop zone A. When the thermostat 2 reaches the stability zone B and reaches the ON point C which intersects the ON position of the thermostat 2, the thermostat 2
By turning on the compressor 12, the operation of the compressor 12 is not started at the low rotation speed of 30 Hz in the zone B, but resumes operation at the high speed rotation of 40 Hz in the zone C. By restarting the operation in zone C, the temperature gradient curve quickly changes from an upward slope to a downward slope again, and the compressor 12 is operated in the stable zone B.

Therefore, the temperature gradient curve is different from the zone F to
If the slope changes from a downward slope to an upward slope while the area is located in area B, each zone F~
B is shifted up by one rank to the side where the range of change in temperature difference between the air temperature and the set value increases, and the compressor 12 is rotated at a constant rotation speed from the current rank to the next higher rank. In addition, when the temperature gradient curve changes from a high downward slope to an upward slope while the temperature gradient curve is located in the stop zone A, the on point of the thermostat 2 is changed without shifting up the stable zone B. Ha,
The thermostat is positioned above the set thermostat on position (temperature difference 1.0°C) without being shifted up, and therefore the stop time of the compressor 12, that is, the time from the off point A to the on point C, is shorter than before. Moreover, even after restarting the operation, it is possible to immediately operate in the stable zone B, and comfortable temperature control is performed.

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 off temperature of the thermostat 2. By doing so, the temperature difference detection means 3 and the calculation means 4, it is determined whether the room temperature is equal to or less than the value set by the setting means 1;
If YES, that is, if the room temperature is equal to or less than the set value, the operation of the compressor 12 is 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; In the case of YES, that is, when the compressor 12 is in a stopped state, the temperature gradient curve exceeds the inflection point B and becomes an upward slope, and the temperature gradient curve is located in the stop zone A. According to the output signal from the shift-up canceling means 9, the one-rank shift-up of the stable zone B is canceled without the on-position being shifted up, and after this, the room temperature reaches the on-position set by the thermostat 2. It is determined whether the temperature is equal to or higher than the temperature at the on position, and if the answer is yes, that is, when the room temperature is equal to or higher than the temperature at the on position,
An operation command is output from the command means 11 to the compressor 12, and if the answer is NO, that is, if the room temperature is lower than the temperature at the ON position, the above-described control is repeated.

Further, it is determined whether the room temperature is higher than the set value and the thermostat 2 is in an off state, that is, whether the compressor 12 is currently in a stopped state, and the compressor 12 is started. If the state is NO, the performance means 4 uses the current operating zone of the compressor 12 stored in the zone storage means 7 to determine the current operating zone based on the output signal from the temperature gradient change detection means 6. It is compared and judged whether the temperature of the current operating zone is high or not, that is, it is judged whether the temperature gradient curve is upwardly sloped, and if yes, that is, the temperature of the current operating zone is higher than the previous zone. If the temperature gradient curve is large, it is assumed that the temperature gradient curve is on an upward slope, and the output signal from the shift-up means 8 causes the compressor 1 to
The rotation speed of compressor 2 remains the same, the zone is shifted up, and compressor 1 is shifted up in this shifted up zone.
The second operation is performed.

In addition, if the answer is no, that is, the temperature of the current operating zone is lower than that of the previous zone,
Assuming that the temperature gradient curve is on a downward slope, the compressor 12 is operated at the rotation speed of the zone corresponding to the temperature difference without being shifted up.

(Effects of the Invention) As explained above, in the air conditioner operation control device according to the present invention, the room temperature is
temperature gradient change detection means 6 for detecting a gradient change that exceeds the off position and the gradient of room temperature change moves away from the set value after the temperature gradient has stopped;
and a shift-up stop means 9 for stopping the shift-up of the stable zone B when the output from the detection means 6 on the stop side of the compressor 12 is provided, so that the compressor 12 is stopped at an off position;
A stable zone B with a predetermined differential is provided between the ON position and the ON position at which the compressor 12 is restarted, and this stable zone B can prevent the compressor 12 from starting and stopping hunting. In this case, this re-operation is performed at the high rotation speed of the upper zone C, which is set to high rotation speed, by the low speed rotation set corresponding to the stable zone B, and the transition from the upward slope to the downward slope of the room temperature is performed. The shift-up in the stable zone B is stopped when the detecting means 6 outputs the output after the compressor 12 has stopped, while the shift-up in the stable zone B can be quickly performed by approaching the set value quickly. Therefore, it is possible to prevent the time from when the compressor 12 is stopped until it is restarted from becoming longer due to shift-up, and the time until the compressor 12 is restarted, which has been a problem, can be shortened. Therefore, the control accuracy of the air conditioner can be improved by integrating the above-mentioned effects, and comfortable operation control can be performed.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the operation control device of the present invention, Fig. 2 is an explanatory diagram explaining the control mode of the compressor according to the temperature difference between the room temperature and the set value, and Fig. 3 is the flowchart of the operation control device. The chart diagram and FIG. 4 are explanatory diagrams for explaining a conventional example. 6... Temperature gradient change detection means, 9... Shift up stop means, 12... Compressor, B... Stable zone, C to F... Zones.

Claims (1)

[Claims] 1. Equipped with a compressor 12 whose rotation speed can be controlled, and an off position in which the compressor 12 is stopped when the room temperature is below a set value, and an off position when the room temperature exceeds the set value and reaches a predetermined temperature with respect to this set value. , and an on position where the stopped compressor 12 is restarted, and a stable zone B where the compressor 12 rotates at a low speed is formed between these on position and off position, and this stable zone The range of change in the temperature difference between the room temperature and the set value in the region exceeding B is divided into a plurality of zones C to F, and the rotation speed of the compressor 12 is set higher than the rotation speed in the stable zone B to each zone. When the rotational speed is controlled to correspond to C to F, and the gradient of room temperature change moves away from the set value, the range of change in temperature difference between the room temperature and the set value for each zone B to F is In the operation control device that is designed to shift up to the rising side,
Temperature gradient change detection means 6 for detecting a gradient change in which the room temperature exceeds the off position after the compressor 12 stops and the gradient of the room temperature change moves away from the set value; 12. An operation control device for an air conditioner, comprising: a shift-up stop means 9 for stopping the shift-up of the stable zone B when the detection means 6 outputs the output after the stop of the air conditioner.