JPS6066077A - Controller for refrigerator - 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 (a) Field of Industrial Application The present invention relates to a refrigerator whose operating capacity can be changed, and particularly relates to control of this operating capacity.

(Naka) Conventional technology In general, when controlling the operating capacity of a refrigerator whose operating capacity can be changed using a variable capacity compressor or a combination of multiple compressors, the sensor that detects the controlled temperature of the refrigerator is placed at the controlled position. In preparation for this, adjust the difference between the detected temperature of this sensor and the set temperature according to the difference.
1, Nakahiro 1, ner 11 sill, gi outside 1 During cooling operation of the physical conditioner, if the difference between the detected temperature of the sensor and the set temperature is large, the operating capacity of the compressor should be increased or the compressor's operating capacity should be increased. There have been methods to increase the number of compressors in operation, and to reduce the operating capacity of the compressor or to reduce the number of compressors in operation when the difference between the temperature detected by the sensor and the set temperature is small. When controlling the operating capacity of an air conditioner in this way, it was controlled based on the temperature detected by the sensor, so if an instantaneous temperature fluctuation occurs, the operating capacity changes due to this fluctuation, and the differential width in the control device If the range was too wide, it would take an unreasonable amount of time to return to an appropriate operating capacity commensurate with the load. Further, when the temperature control width is set narrowly, the step width of each operating capacity becomes small, and the fluctuations in the operating capacity become severe.

In addition, using the same sensor as above, the temperature is detected at predetermined time intervals, the temperature gradient is calculated from this temperature difference, the difference between this value and the predetermined value is determined, and when this difference is large, the operating capacity of the compressor is When the difference between the temperature gradient and a predetermined value is small, the operating capacity of the compressor is reduced or the number of compressors operated is reduced. When the operating capacity of an air conditioner is controlled in this way, the operating capacity can only be changed at predetermined intervals. Therefore, if this cycle is long, there will be a delay in response to load fluctuations, and this cycle will be delayed. If the time period is too short, the operating capacity must be changed frequently, which may lead to equipment failure.

(c) Purpose of the Invention In order to address these problems, the present invention calculates the time required for a predetermined temperature change range and changes the operating capacity of the refrigerator based on this time to respond to predicted load fluctuations. The present invention provides a control device that allows operation to be performed with optimal operating performance.

B) Structure of the Invention The refrigerator control device according to the present invention includes a sensor that detects the temperature to be controlled, a timer that measures the time for the output of the sensor to change by a predetermined width, and a controller that measures the operating capacity of the refrigerator based on this time. The chiller is equipped with a calculating means for changing the load, so that the refrigerator can be operated with an operating capacity commensurate with predicted load fluctuations.

(E) Example Hereinafter, an example in which the present invention is applied to an air conditioner consisting of five units <AJ to (E) will be explained based on FIGS. 1 to 5. First, FIG. This is a schematic configuration diagram of a harmonizer, in which units 1 to 1 are each equipped with a refrigeration cycle, and each unit cools hot water sent by pumps (1) to (5) during cooling operation, and cools it during heating operation. It is heated and sent out. Note that (6) to aO) are check valves,
Further, aI) is a cooling tower, which is connected to the units (4) to (2) via pumps (a) and piping. 0
3) is a feed pipe that guides the hot water sent out from the units (A) to 2) to a plurality of fan coils a, and this pipe 03) is equipped with a hot water sensor aω that detects the temperature (controlled temperature) of the hot water sent out. It is being In addition, each fan coil αa is connected to a feed pipe (131) via a solenoid valve (16). αη is connected to a unit (
5) Return piping leading to (E), an outside temperature sensor that detects the temperature of the outside air, (1'J is a hot water sensor (151,
It is a control mechanism that controls the operation of units (A) to (E) and pumps (1) to (5) based on the output and operation setting value of the outside temperature sensor 081, and is configured as shown in FIG. There is. In other words, the hot water center (151), the keyboard (2
Calculation based on the input of 01 and unit capture to (6),
It consists of a microprocessor (2υ (calculation means)) that controls the pumps (1) to (5).
The analog/digital (A/D) converts analog input from the hot water sensor and external temperature sensor Q barrel into digital input.
) converter, (c) is a timekeeping means that measures time using the signal from the microprocessor cassette υ.

The operation of this microprocessor (21) is controlled by the outside temperature sensor (1al) when the operation is started, especially during cooling operation.
The number of operating units (a) to (g) at the start of operation is set by performing calculations and judgments as shown in FIG. 3 based on the input from the controller. That is, the outside temperature sensor 0.
The detected temperature of 8+ is θ. Knee, kI when larger than degree
^1xZE/C11y-Mu r-2 W+: Knee 4. I
'-'The detected temperature of lil force 4 no M4 mJv sensor 0 frame is θ
. When the temperature is below 50°C, any four of the units (A) to (D) will start operating. This θ. The value of is determined according to the capacity of each unit and the size of the air conditioning load. For example, when the capacity of each unit is large, θ is determined. When the capacity of each unit is small, the value of θ is set small.In this way, unit 4
When the machine starts operating, a timer in the microprocessor 0υ is activated. After this, when the timer counts 1 hour, the microprocessor eυ detects the hot water temperature with the hot water sensor a5 installed in the feed pipe Q3), and when this detected temperature is higher than 01 degrees, the microprocessor eυ detects the hot water temperature in units 1-(A) to (E).
) After switching to operation of 5 units, normal operation (■) is reached. If the temperature detected by the hot water sensor aω is below 61 degrees, continue as is ■
Normal operation is reached, and even when operation is started with five units, normal operation continues after the start of operation. Timer time and 06
The degree is also θ. Similar to the air conditioning rate, it is determined according to the capacity of each unit and the size of the air conditioning load, and operation is started with the optimal number of units that matches the overall capacity of the air conditioner and the condition of the air conditioning load. be.

When operation is started in this way, the microprocessor (2
11, as shown in Fig. 4, measures the time when the detected value detected by the hot water sensor (I5) changes by a predetermined width using a timing means (c), and increases or decreases the number of operating units based on this time. It is. That is, until the detected temperature (Tl) of the hot water sensor (15) becomes 01 degrees (=10 degrees) or less, operation is performed with the number of operating units determined based on FIG. When T becomes less than 01 degrees, microprocessor CI!D sets internal variable T to 1.
0''', and then outputs an ON signal to the timekeeping means C?3) to start timekeeping.After this, the microprocessor C?
21) is a hot water sensor Q5) that detects the temperature (T) at a cycle of approximately 2 seconds and performs the following operations. First, it is determined whether the temperature (power) is below 5.5 degrees (lower limit set value of water temperature for protection), and if the temperature CI"l is below 5.5 degrees, the unit (
4) Stop all operations. At this time, one of the pumps, for example, the pump (1), maintains its operation and sends cold and hot water to the seventh uncoil a4 through the sending pipe (13). After this, when the temperature (T) becomes 7 degrees or higher, the unit (5
) and resume normal operation. Further, when the detected temperature α) of the hot water sensor (15) is 5.5 degrees or higher and the condition 'l≦To-T' is satisfied, that is, the variable T is set inside the microprocessor 021).

When the detected temperature α) of the hot water sensor (I5) becomes lower by about 1 degree or more, it is determined that the temperature (force) is on a downward slope, and the next operation is performed.

First, add -1'' to the value of variable T to create a new T.

After setting, issue a timing stop signal to the timing means (c) and read this clocked time at the same time to calculate the predicted time when the detected temperature (T) of hot water sensor Q51 will reach 6 degrees if this operating state is maintained. Compute (T,). This predicted time (
When Ta) is Tx≦15'', the number of units in operation is reduced by two, when Tx≦30', the number of units in operation is reduced by one, and when rx > 30, the number of units in operation is reduced by one. It determines whether to maintain the same status or change the number of operating units depending on the load condition.

Also hot water sensor a! When the liver test of li1 does not satisfy the condition of "°l≦T-To when the hypertrophy π is 5.5 degrees or more," that is, the hot water sensor (15 ) detected temperature (T) is approximately 1
It is determined that the temperature σ is on an upward slope and the next operation is performed. First, variable T. +1 to the value of
After adding ", it is determined whether the variable T. is 10" or not. When the value of T is 10" or more, it is the initial state of operation. Variable T.

If the value of is smaller than 10'', calculate the predicted time (T, ) for the detected temperature (T) to reach 6 degrees in the same way as above.If this predicted time (TI) is TI≧15'', the unit will not operate. It determines whether to change the number of units in operation according to the load condition, such as increasing the number of units by one and increasing the number of units in operation by two when the TX is 15".

Furthermore, the maximum number of units in operation does not exceed 5 units, and even if an operation signal for 5 units or more is given, only 5 units will be operated.If it is necessary to operate 5 or more units, It is necessary to increase the total number of units. When all the units are in a stopped state, one of the pumps is maintained in operation to maintain the supply of cooling water to the fan coil α.

In addition, the selection of the operation unit is performed by a microprocessor (21).
It is arbitrarily selected.

A case in which an air conditioner that operates in this manner is actually operated will be explained based on FIG. 5. For example, when the outside temperature is θ. When operation is started when the temperature is below 50°C, the microprocessor 0υ makes a determination as shown in FIG. 3 based on the outside temperature detected by the outside temperature sensor α8, and the four units start operating. At this time, since the air conditioning load was heavy (the temperature of the hot water remained even after a certain period of time) was greater than 08 degrees, the number of operating units was increased to five. Thereafter, when the hot water temperature (T) decreases to 10 degrees, the timer (2) starts measuring time based on a signal from the microprocessor (21). After this, the hot water temperature σ
) further decreases to 9 degrees, the timer (c) stops measuring time and counts this time (t, ). This clock time (tl
), the time (tx+) during which the hot water temperature C1l') reaches 6 degrees is calculated if the number of operating units is maintained as is. Since this predicted time (t□) is in the relationship 15<Tx1≦30, the number of operating units is changed to four. After this, in the same way as above, the timer (c) measures the hot water temperature α.
) is measured from 9 degrees to 8 degrees (t2), similarly calculates the predicted time (tx2) for the hot water temperature (T) to drop to 6 degrees, and based on this predicted time (txz), the unit The number of vehicles in operation will be reduced by one to three.

Furthermore, the time (t,) until the hot water temperature ('r) decreases from 8 degrees to 7 degrees is measured, and the predicted time (txs) is calculated in the same way. Based on this predicted time (tx,), the number of UNITOOTs in operation is reduced by one and changed to two.

In this way, based on the time (t4) for the air conditioning load and the air conditioning load to reach almost the same level when two units are operated and the hot water temperature ('r) rises from 7 degrees to 8 degrees, the negative predicted time (
1x4) is detected, the number of operating units is increased by one, and the operation is changed to three units.

Below, unless there is a large change in the air conditioning load, three units or two units will be operated; if there is a large change in the air conditioning load, the number of units in operation will increase to match this change. It is.

In the above embodiment, only the case of cooling operation was explained, but similar control can be performed also in case of heating operation. In other words, in the case of heating operation, the number of operating units may be reduced when the hot water temperature Cr) is on an upward slope, and the number of operating units may be increased when the hot water temperature σ) is on a downward slope. The constants and set values used in are set based on factors such as the overall capacity of the air conditioner, the capacity of each unit, and the design size of the air conditioning load.

Further, the time measuring means used in the above embodiments may be configured by software inside a microprocessor (arithmetic means).

Further, unlike the above embodiments, the present invention is not limited to controlling the capacity of air conditioners, but can be used to control the capacity of refrigerators in general.

(f) Effects of the Invention The refrigerator control device of the present invention includes a sensor that detects the temperature to be controlled, a timer that measures the time for the output of this sensor to change by a predetermined width, and a refrigerator operating capacity based on this time. Since it is equipped with a calculation means for changing the load fluctuation, it is possible to detect the load fluctuation through the sensor and predict the load fluctuation based on the change time of this predetermined width. By making the following changes, it is possible to reduce the range of temperature changes in the load controlled by the refrigerator.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an air conditioner according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the control mechanism shown in FIG. 1, and FIG. 3 is a diagram showing the control mechanism shown in FIG. 2 when the microprocessor shown in FIG. FIG. 4 is an explanatory diagram showing a flow chart of operations performed by the microprocessor shown in FIG. 2 during normal operation. FIG. 5 is an explanatory diagram showing changes in hot water temperature. α9... Hot water sensor, 0υ... Microprocessor, e3)... Timing means. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) It is equipped with one sensor that detects the temperature to be controlled, a timer that measures the time that the output of this sensor changes by a predetermined width, and a calculation means that changes the operating capacity of the refrigerator based on this time. Features of the refrigerator control device.