JP4850103B2 - Cooling control system, cooling control controller, cooling control program, and cooling control method - Google Patents

Description

  The present invention relates to a cooling control system, a cooling control controller, a cooling control program, and a cooling control method.

  Conventionally, a refrigerator system comprising a plurality of showcases and one refrigerator is known. In this refrigerator system, when all the showcase solenoid valves are turned off (closed state), the compressor that pumps the refrigerant stops. Also, in the refrigerator system, there are solenoid valves that are opened due to undershooting of the refrigerant gas pressure due to the closing operation of multiple solenoid valves, and the refrigerant gas pressure reaches the compressor stop pressure. Despite this, the compressor stops. If the compressor is stopped in this manner, the compressor is frequently operated and stopped, resulting in an increase in energy loss.

Thus, a refrigerator system that reduces the number of times the compressor is stopped has been proposed. In this system, if there is a showcase whose internal temperature is equal to or higher than t1 ° C., the solenoid valve is opened and the compressor is operated except for the showcase whose internal temperature is t2 ° C. (temperature less than t1 ° C.). . Thereby, only the showcase with a high internal temperature is cooled. On the other hand, for the showcase in which the solenoid valves are open, when the internal temperature is equal to or lower than t3 ° C. (temperature less than t2 ° C.), all the solenoid valves are closed and the compressor is stopped for a certain time. However, if the internal temperature becomes equal to or higher than t4 ° C. (the upper limit value of the internal temperature) even within a certain time, the same control as that when the internal temperature becomes equal to or higher than t1 ° C. is performed. As described above, this refrigerator system achieves energy saving by synchronizing the opening and closing of the solenoid valve with the operation and stop of the compressor (see Patent Document 1).
JP 2003-139455 A

  However, according to the system described in Patent Document 1, it cannot be said that the number of stoppages of the compressor has been sufficiently reduced, and energy saving is still insufficient.

  In view of the above-described problems, the present invention provides a cooling control system, a cooling control controller, a cooling control program, and a cooling control method that can save energy by further reducing the number of times the compressor is stopped or not stopping the compressor. The purpose is to provide.

  The refrigeration control system of the present invention includes a plurality of cooling target devices, a compressor that pumps refrigerant, a refrigerant pipe that connects the plurality of cooling target devices and the compressor in parallel, and a cooling target device. A control valve that controls the inflow of the refrigerant pumped by the compressor through the refrigerant pipe into the object to be cooled by an opening operation and a closing operation, and a cooling control controller that opens and closes the control valve. Is a stop prediction unit that predicts the timing at which the compressor stops, a priority order determination unit that determines the priority order of the control valves to be opened at the timing at which the compressor stops based on information of the plurality of cooling target devices, The priority determined by the priority determination unit is high at the timing when the compressor predicted by the stop prediction unit stops. And having a control valve instructing section to open at least one control valve in order from the.

  According to the cooling control system of the present invention, the priority order indicating the order of opening is determined, the timing at which the compressor stops is predicted, and the timing at which the compressor stops is at least one in descending order of priority. Open the two control valves. For this reason, it is possible to prevent the compressor from being stopped due to the control valve being blocked. Therefore, it is possible to save energy by further reducing the number of stoppages of the compressor or not stopping the compressor.

  In the cooling control system of the present invention, it is preferable that the priority order determination unit lowers the priority order of the control valves that are opened at the timing when the compressor stops.

  According to this cooling control system, one control valve is frequently opened to lower the priority of control valves that are opened at the timing when the compressor stops, and the temperature of one cooling target device decreases. Can be suppressed.

  In the cooling control system of the present invention, the stop predicting unit predicts the timing at which the control valve is closed and opened from the temperature transition of each cooling target device and the set temperature, and uses the information on the timing at which the control valve is closed and opened. Based on this, when all the control valves are in a closed state, or when two or more control valves among a plurality of control valves are closed within a certain time, it is predicted that the timing at which the compressor stops is predicted. preferable.

  According to this cooling control system, the timing at which the control valve is closed and opened is predicted from the temperature transition of each cooling target device and the set temperature. For this reason, the closing and opening timing of the control valve can be accurately obtained based on the relationship between the temperature of the cooling target device and the set temperature. Furthermore, it is the timing at which the compressor stops when all the control valves are in the closed state or when two or more control valves are closed within a certain time based on the information on the closed timing obtained accurately. Predict. For this reason, the timing at which the compressor stops can be predicted.

  Further, in the cooling control system of the present invention, the stop prediction unit is configured such that when all the control valves are in a closed state based on information on a cycle in which the plurality of control valves perform the closing operation and the opening operation, or the plurality of control valves It is preferable to predict that the timing at which the compressor stops when two or more control valves among the valves perform the closing operation within a predetermined time.

  According to this cooling control system, when all the control valves are in the closed state based on the information on the cycle in which the plurality of control valves perform the closing operation and the opening operation, two or more control valves are closed within a certain time. It is predicted that it is time to stop the compressor. For this reason, it is the timing when the compressor stops when all the control valves are in the closed state or when two or more control valves are closed within a certain time from the direct information that the control valves are closed. Therefore, the timing at which the compressor stops can be predicted.

  Further, in the cooling control system of the present invention, the stop prediction unit controls the control set according to the cooling load of each cooling target device when two or more control valves of the plurality of control valves are closed within a certain time. Of the weights for each valve, it is preferable to predict the timing at which the compressor stops from the weight of the control valve that closes within a certain time.

  According to this cooling control system, the timing at which the compressor stops is predicted from the weights of two or more control valves that perform the closing operation within a predetermined time. Here, if two or more control valves are closed within a certain time, the refrigerant gas pressure undershoots and the compressor stops. However, even if the refrigerant gas pressure undershoots, the gas pressure stops the compressor. If pressure is not reached, the compressor will not stop. For this reason, it is possible to determine whether or not the gas pressure causes the underpressure to reach the compressor stop pressure by predicting the timing at which the compressor stops from the weight of the control valve that performs the closing operation within a certain time. It is possible to improve the prediction accuracy of the timing when the compressor stops.

  Further, in the cooling control system of the present invention, the weight for each control valve is a weight value, and the stop prediction unit adds the weight value of the control valve that is closed within a certain time, and the added value obtained by the addition Is greater than a preset threshold value, it is predicted that the compressor will stop, and the control valve operation instructing unit sets the open state by opening at least one control valve in descending order of priority. The value obtained by subtracting the weight value of the control valve from the added value is preferably less than the threshold value.

  According to this cooling control system, the weight for each control valve is a weight value, and the compressor stop prediction process is performed in order to predict the stop of the compressor from the added value of the weight value of the control valve that is closed within a certain time. It can be easily executed by numerical values. Further, in order to prevent the compressor from stopping, it is only necessary to subtract the weight value of the control valve to be opened to determine whether the value is less than the threshold value, and the compressor stop prevention process can be easily executed by the numerical value. .

  The cooling controller of the present invention is provided for each of a plurality of cooling target devices, and opens a control valve that controls the flow of refrigerant pumped by the compressor into the cooling target device by an opening operation and a closing operation. A cooling control controller that performs a closing operation, the stop prediction unit that predicts the timing at which the compressor stops, and the priority order of the control valves that are opened at the timing at which the compressor stops based on information on a plurality of cooling target devices Control valve operation that opens at least one control valve in order from the highest priority determined by the priority determination unit at the timing when the compressor predicted by the priority determination unit and the stop prediction unit stops And an instruction unit.

  According to this cooling control controller, the priority order indicating the order of opening is determined, the timing at which the compressor stops is predicted, and at least one control in order from the highest priority order at the timing at which the compressor stops. Open the valve. For this reason, it is possible to prevent the compressor from being stopped due to the control valve being blocked. Therefore, it is possible to save energy by further reducing the number of stoppages of the compressor or not stopping the compressor.

  The cooling control program of the present invention is provided for each of a plurality of cooling target devices, and opens a control valve that controls the flow of refrigerant pumped by a compressor into the cooling target device by an opening operation and a closing operation. A cooling control program for causing the cooling control controller to perform the closing operation, the stop prediction step for predicting the timing at which the compressor stops, and the open state at the timing at which the compressor stops based on the information of the plurality of cooling target devices At least one control valve in order from the highest priority determined in the priority determination step at the timing when the compressor predicted in the stop prediction step stops. And a control valve operation instruction step for opening And characterized in that.

  According to the cooling control program of the present invention, the priority order indicating the order of opening is determined, the timing at which the compressor stops is predicted, and the timing at which the compressor stops is at least 1 in order from the highest priority order. Open the two control valves. For this reason, it is possible to prevent the compressor from being stopped due to the control valve being blocked. Therefore, it is possible to save energy by further reducing the number of stoppages of the compressor or not stopping the compressor.

  Further, the cooling control method of the present invention is provided for each of the plurality of cooling target devices, and opens a control valve that controls the flow of the refrigerant pumped by the compressor into the cooling target device by the opening operation and the closing operation. A cooling control method for closing operation, wherein a stop prediction step for predicting the timing at which the compressor stops and a priority order of control valves to be opened at the timing at which the compressor stops based on information on a plurality of cooling target devices. Control valve operation that opens at least one control valve in order from the highest priority determined in the priority determination step at the timing of determining the priority order and the timing of the compressor predicted in the stop prediction step. An instruction step.

  According to the cooling control method of the present invention, the priority order indicating the order of opening is determined, the timing at which the compressor stops is predicted, and the timing at which the compressor stops is at least 1 in order from the highest priority order. Open the two control valves. For this reason, it is possible to prevent the compressor from being stopped due to the control valve being blocked. Therefore, it is possible to save energy by further reducing the number of stoppages of the compressor or not stopping the compressor.

  Note that the timing at which the compressor stops includes a period during which the compressor stops from prediction.

  According to the present invention, it is possible to save energy by further reducing the number of stoppages of the compressor or not stopping the compressor.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a cooling control system according to the present embodiment. As shown in FIG. 1, the cooling control system 1 includes a refrigerator 10, a refrigerant supply pipe 20, a plurality of showcases 30 that are objects to be cooled, a refrigerant discharge pipe 40, and a centralized management controller 50. Yes.

  The refrigerator 10 includes an inverter compressor 11 (hereinafter simply referred to as a compressor 11) and a condenser 12. The compressor 11 compresses the gaseous refrigerant to a high temperature and high pressure and sends it to the condenser 12. The condenser 12 heats and exchanges high-temperature and high-pressure gas refrigerant with outside air to condense and liquefy it. The plurality of showcases 30 and the compressor 11 are connected in parallel by the refrigerant supply pipe 20 and the refrigerant discharge pipe 40.

  The refrigerant supply pipe 20 supplies the refrigerant from the refrigerator 10 to the plurality of showcases 30, and includes first to fifth branch pipes 21a to 21e. The first branch pipe 21a supplies refrigerant to the first showcase 30a, and the second branch pipe 21b supplies refrigerant to the second showcase 30b. The third branch pipe 21c supplies refrigerant to the third showcase 30c, and the fourth branch pipe 21d supplies refrigerant to the fourth showcase 30d. The fifth branch pipe 21e supplies refrigerant to the fifth showcase 30e.

  The plurality of showcases 30 are installed in a store such as a supermarket to cool goods and the like in the case, and include first to fifth electromagnetic valves (control valves) 31a to 31e and first to fifth expansion valves 32a. To 32e, first to fifth evaporators 33a to 33e, and first to fifth temperature sensors 34a to 34e.

  Since the plurality of showcases 30 have the same configuration, the first showcase 30a will be described as an example. The first showcase 30a includes a first electromagnetic valve 31a, a first expansion valve 32a, a first evaporator 33a, and a first temperature sensor 34a.

  The first solenoid valve 31a controls the inflow of the refrigerant pumped from the compressor 11 through the refrigerant supply pipe 20 into the first showcase 30a by performing an opening operation and a closing operation. The first expansion valve 32a is a low-temperature and low-pressure liquid refrigerant by decompressing and expanding the high-temperature and high-pressure liquid refrigerant. The 1st evaporator 33a cools the inside of the 1st showcase 30a by supply of a refrigerant. The first temperature sensor 34 a detects the internal temperature of the first showcase 30 a and transmits it to the centralized controller 50.

  The refrigerant discharge pipe 40 is for sending the refrigerant discharged from the plurality of showcases 30 to the refrigerator 10. The centralized management controller 50 controls the entire refrigerator system 1, and in particular, causes the plurality of electromagnetic valves 31a to 31e to open and close.

  FIG. 2 is a detailed configuration diagram of the centralized management controller 50 shown in FIG. In the present embodiment, the centralized management controller 50 performs learning, and is configured to control the plurality of electromagnetic valves 31a to 31e so as to prevent the compressor 11 from stopping based on the learning content.

  The centralized management controller 50 includes a data collection unit 51, a priority order determination unit 52, a stop prediction unit 53, and a control valve operation instruction unit 54. Briefly, the stop prediction unit 53 predicts the timing at which the compressor 11 stops, and the control valve operation instruction unit 54 opens at least one electromagnetic valve 31 at the timing at which the compressor 11 stops. For example, the compressor 11 stops when all the solenoid valves 31a to 31e are closed. However, when the control valve operation instructing unit 54 opens at least one electromagnetic valve 31, it can be avoided that all the electromagnetic valves 31 a to 31 e are closed, and the stop of the compressor 11 can be prevented. Note that “at the timing when the compressor 11 stops” includes the time from when the compressor 11 is predicted to stop until it stops.

  In addition, at the timing when the compressor 11 stops, at least one of the solenoid valves 31 having a higher priority is sequentially opened. This priority order is determined by the priority order determination unit 52. The priority order determination unit 52 is configured to determine the priority order based on information of the plurality of showcases 30a to 30e collected by the data collection unit 51.

  The configuration of the data collection unit 51, the priority order determination unit 52, the stop prediction unit 53, and the control valve operation instruction unit 54 will be described in detail. The data collection unit 51 collects information on the internal temperature transition and set temperature of the plurality of showcases 30a to 30e, and operation information on the plurality of electromagnetic valves 31a to 31e.

  FIG. 3 is a diagram showing information collected by the data collection unit 51 shown in FIG. The data collection unit 51 collects and stores information on the transition of the internal temperature and the set temperature as shown in FIG. 3A for each showcase 30a to 30e. Furthermore, the data collection unit 51 collects and stores information on the on / off signals of the electromagnetic valves 31a to 31e as shown in FIG.

  Reference is again made to FIG. The priority order determination unit 52 determines the priority order of the electromagnetic valves 31 to be opened at the timing when the compressor 11 stops, and includes a pattern division unit 52a. The pattern division unit 52a performs pattern division on the plurality of electromagnetic valves 31a to 31e based on the information of the on / off signals of the electromagnetic valves 31a to 31e collected by the data collection unit 51.

  FIG. 4 is a diagram for explaining pattern division performed by the pattern division unit 52a shown in FIG. The pattern division unit 52a divides the electromagnetic valves 31a to 31e into four patterns as shown in FIG. Specifically, as shown in FIG. 4A, the pattern division unit 52a has a high operation rate R (the ratio that the solenoid valve 31 is turned on for a certain period of time) and a high average value L of the continuous time in the open state. Is pattern 1. The pattern dividing unit 52a sets the pattern 2 as a pattern 2 having a high operation rate R and a low average value L of the continuous time in the open state (FIG. 4 (b)). A pattern having a high average value L is defined as a pattern 3 (FIG. 4C). Furthermore, the pattern division part 52a makes the pattern 4 the thing with the low operation rate R and the low average value L of the continuous time of an open state (FIG.4 (d)).

Reference is again made to FIG. The priority order determination part 52 determines a priority order with respect to the solenoid valves 31a to 31e divided by the pattern dividing part 52a. Specifically, the priority order determination unit 52 determines the priority order as shown in Table 1.

Here, the area is shown in FIG. FIG. 5 is a diagram illustrating calculation of an area by the priority order determination unit 52 illustrated in FIG. As shown in FIGS. 5A and 5B, the priority order determination unit 52 calculates the area from the information on the internal temperature transition collected by the data collection unit 51 and the information on the set temperature. . That is, as shown in FIG. 5A, the priority order determination unit 52 averages A _ave of the integrated values A _{1 to} A _{i + 1} and B _{1 to} B _{i + 1} of the portion exceeding the set temperature in the internal temperature transition. , B _ave , and this is the area.

The size of the area is determined based on whether or not the average values A _ave and B _ave of the integrated values A _{1 to} A _{i + 1} and B _{1 to} B _{i + 1 in} the portion exceeding the set temperature are equal to or larger than the area threshold value. For example, since the average value A _ave is less than the area threshold, the area is made small. On the other hand, since the average value B _ave is equal to or greater than the area threshold, the area is increased.

  The reason why the priority order is high for the electromagnetic valve 31 of the pattern 4 is that the electromagnetic valve 31 of the pattern 4 has the highest flexibility. 6A and 6B are diagrams showing the flexibility of the solenoid valve 31. FIG. In order to prevent the compressor 11 from stopping, at least one solenoid valve 31 must be opened. As shown in FIG. 6A, the electromagnetic valve 31 of the pattern 4 is long in the closed state, and the continuous open time is short. For this reason, since the time slot | zone which makes the solenoid valve 31 an open state can be changed easily, the priority is high.

  On the other hand, as shown in FIG. 6B, the electromagnetic valve 31 of the pattern 1 has a long open time and a long continuous open time. For this reason, the time zone which makes the electromagnetic valve 31 an open state cannot be changed easily, and the priority is low. For this reason, the priority order of the electromagnetic valve 31 of the pattern 4 is high.

  Furthermore, the reason why the priority is high for the solenoid valve 31 having a large area is as follows. FIG. 6C and FIG. 6D are diagrams showing the reasons for determining priority based on area. As shown in FIG.6 (c), in the solenoid valve 31 with a large area, it has shown that the internal temperature of the showcase 30 cannot fall easily. That is, the large area indicates that the inside temperature is higher than the set temperature and the inside temperature rises greatly despite the start of cooling, indicating that the showcase 30 is difficult to cool. ing. The showcase 30 that is difficult to cool is less likely to be too cool than the showcase 30 that is easy to cool, even if the solenoid valve 31 is frequently opened. Therefore, when the area is large, the priority is high.

  The priority order is not limited to the case determined as described above, and may be determined as follows. For example, the priority order determination unit 52 may determine the priority order from the magnitude of the peak value of the internal temperature instead of the size of the area. When the peak value is high, it can be said that the showcase 30 is difficult to cool, and the priority order can be determined in the same manner as described above.

  Moreover, the priority order determination part 52 may make the priority order of the solenoid valve 31 about the showcase 30 with low setting temperature high. This is because the showcase 30 having a low set temperature is unlikely to be overcooled due to the low set temperature, and the priority can be determined in the same manner as described above.

  Furthermore, the priority order determination unit 52 may increase the priority order of the solenoid valves 31 for the showcase 30 having a large internal volume. This is because the showcase 30 with a large internal volume takes time to cool and is not easily cooled, and the priority can be determined in the same manner as described above.

  Reference is again made to FIG. The stop prediction unit 53 predicts the timing at which the compressor 11 stops. The compressor 11 stops when the solenoid valves 31a to 31e of all the showcases 30 are closed. Further, the compressor 11 may stop when two or more of the plurality of electromagnetic valves 31a to 31e are closed within a certain time. The latter will be described in detail.

  FIG. 7 is a diagram illustrating a state in which the compressor 11 stops when two or more of the plurality of solenoid valves perform a closing operation within a predetermined time, and FIGS. The example which operate | moves is shown, (e)-(h) has shown the example which carries out the blockade operation | movement simultaneously within a fixed time. In FIG. 7, the case where there are four electromagnetic valves 31 will be described as an example.

  As shown in FIG. 7A, one solenoid valve 31 is turned off (closed operation) at time t1, the other solenoid valve 31 is turned off at time t2, and one more solenoid valve 31 is turned on at time t3. Suppose that it is turned off. The remaining one solenoid valve 31 remains open.

  In this case, as shown in FIG. 7B, the load on the refrigerator 10 is gradually reduced. Further, as shown in FIG. 7C, the refrigerant gas pressure once decreases at time t1, but then returns to the target pressure. Similarly, at time t2 and time t3, the gas pressure once decreases and then returns to the target pressure. For this reason, as shown in FIG. 7D, the compressor frequency does not become “0” and the compressor 11 does not stop. As described above, when the solenoid valve 31 is sequentially driven to close, the compressor 11 does not stop.

  On the other hand, as shown in FIG. 7E, it is assumed that the three solenoid valves 31 are simultaneously turned off at time t4. The remaining one solenoid valve 31 remains open. In this case, as shown in FIG. 7F, the load on the refrigerator 10 is reduced at a stretch. Then, as shown in FIG. 7G, the refrigerant gas pressure causes an undershoot at time t4 and becomes equal to or lower than the compressor stop pressure at time t5. For this reason, as shown in FIG. 7 (h), the compressor frequency becomes “0” at time t5, and the compressor 11 stops. Thereafter, the compressor 11 starts operation at time t6 when the gas pressure significantly exceeds the target value. As described above, when the solenoid valves 31 are simultaneously closed, the compressor 11 is stopped, and then the operation is started, so that energy loss increases.

  As shown in FIG. 7E, the compressor 11 does not stop only when two or more solenoid valves 31 are simultaneously closed, but the two or more solenoid valves 31 are simultaneously closed within a certain time. The compressor stops even if it operates. That is, the fixed time is a time that can cause an undershoot of gas pressure when two or more solenoid valves 31 are closed.

  As described above, in the compressor 11, when the solenoid valves 31a to 31e of all the showcases 30a to 30e are closed, two or more of the plurality of solenoid valves 31a to 31e are closed within a predetermined time. If the gas pressure reaches the compressor stop pressure, it stops. For this reason, the stop prediction unit 53 shown in FIG. 2 predicts the future operation of the plurality of solenoid valves 31a to 31e to predict the stop of the compressor 11.

  FIG. 8 is a diagram for explaining the operation prediction of the electromagnetic valve 31 by the stop prediction unit 53 shown in FIG. As shown in FIG. 8, the stop prediction unit 53 assumes that the internal temperature gradually decreases from time 0 to t7. In this case, the stop prediction unit 53 determines that the electromagnetic valve 31 is closed at time t8 from the tendency of the internal temperature to decrease. As described above, the stop prediction unit 53 predicts the timing at which the solenoid valves 31a to 31e are closed from the internal temperature transition and the set temperature of the showcases 30a to 30e. Then, the stop predicting unit 53 predicts that all the solenoid valves 31 to 31e are in the closed state and the case where the two or more solenoid valves 31 are closed in a certain time, and determines that the compressor 11 is stopped. To do.

  Here, the centralized management controller 50 further includes a cycle storage unit 55. The cycle storage unit 55 reads and stores information on the cycle in which the plurality of solenoid valves 31a to 31e perform the closing operation and the opening operation from the data collection unit 51. Since the cycle storage unit 55 is provided, the stop prediction unit 53 may predict the timing at which the compressor 11 stops based on the cycle information stored by the cycle storage unit 55.

  FIG. 9 is a second diagram for explaining the operation prediction of the electromagnetic valve 31 by the stop prediction unit 53 shown in FIG. For example, as shown in FIG. 9, the stop predicting unit 53 predicts that the electromagnetic valve 31 is opened at time t10 and the electromagnetic valve 31 is closed at time t11 based on the period information up to time t9. Then, the stop predicting unit 53 predicts that all the solenoid valves 31 to 31e are in the closed state and the case where the two or more solenoid valves 31 are closed in a certain time, and determines that the compressor 11 is stopped. To do.

  Reference is again made to FIG. The control valve operation instructing unit 54 opens at least one electromagnetic valve 31 in an open state in descending order of priority determined by the priority determining unit 52 at the timing when the compressor 11 predicted by the stop predicting unit 53 stops. To do. By opening at least one solenoid valve 31, all the solenoid valves 31 to 31e can be prevented from being closed, and the stop of the compressor 11 can be prevented. Further, by opening at least one electromagnetic valve 31, the influence of pressure undershoot generated when two or more electromagnetic valves 31 are closed within a certain time can be reduced. For this reason, it can be avoided that the gas pressure reaches the compressor stop pressure, and the stop of the compressor 11 can be prevented.

  Here, even if two or more solenoid valves 31 are closed within a certain time, the compressor does not always stop. Therefore, the stop prediction unit 53 must determine whether or not the two or more solenoid valves 31 are closed within a certain time to stop the compressor. In this case, it is desirable that the stop prediction unit 53 determines the stop of the compressor from the weights for the electromagnetic valves 31a to 31e.

As shown in FIG. 2, the centralized management controller 50 has a weight setting unit 56. The weight setting unit 56 sets weights for the electromagnetic valves 31a to 31e in accordance with the set temperatures (cooling loads) of the showcases 30a to 30e. This weight is set as a weight value as shown in Table 2.

  The stop prediction unit 53 adds the weight value of the solenoid valve 31 that performs the closing operation within a predetermined time, and determines that the compressor stops when the added value obtained by the addition is equal to or greater than a preset threshold value. For example, when the solenoid valve 31 provided in the showcase 30 having a set temperature of 5 ° C. to 7 ° C. is closed within a certain time, the added value is “12”. When the threshold value is “10”, the addition value is equal to or greater than the threshold value, so the stop prediction unit 53 determines that the compressor 11 stops. In addition, as a judgment that the compressor 11 stops, not only the weight value of the electromagnetic valve 31 that performs the closing operation within a predetermined time is added, but also if there is the electromagnetic valve 31 that operates to open within the predetermined time, the weight value is set to the above-described value. It is desirable to subtract from the added value.

  Further, the control valve operation instruction unit 54 reduces the influence of the pressure undershoot when two or more solenoid valves 31 are closed within a certain time, and prevents the gas pressure from reaching the compressor stop pressure. Must. In this case, the control valve operation instruction unit 54 opens at least one electromagnetic valve 31 in order from the highest priority. At this time, the control valve operation instruction unit 54 performs control so that the value obtained by subtracting the weight value of the electromagnetic valve 31 to be opened from the added value is less than the threshold value.

  For example, the solenoid valve 31 provided in the showcase 30 having the set temperature of 9 ° C. has the priority “1”, the solenoid valve 31 provided in the showcase 30 having the set temperature of 8 ° C. has the priority “2”, and the added value Is “12”. In this case, even if the solenoid valve 31 having the priority “1” is opened, the value obtained by subtracting “1” from the added value is “11”. For this reason, the control valve operation instruction unit 54 opens both the electromagnetic valve 31 provided in the showcase 30 having a set temperature of 9 ° C. and the electromagnetic valve 31 provided in the showcase 30 having a set temperature of 8 ° C. Thereby, “3” is subtracted from the added value, and the obtained value is less than the threshold value.

  As described above, the control valve operation instruction unit 54 reduces the influence of undershoot and prevents the gas pressure from reaching the compressor stop pressure. In addition, it is a case where the solenoid valve 31 provided in the showcase 30 having the set temperature of 5 ° C. to 7 ° C. is closed within a certain time, and the priority order of the solenoid valve 31 provided in the showcase 30 having the set temperature of 5 ° C. In the case of “1”, the influence of undershoot may be reduced by maintaining the open state without closing the solenoid valve 31 provided in the showcase 30 having the set temperature of 5 ° C.

  Furthermore, when the weight value or the added value of the weight values of the solenoid valve 31 that performs the closing operation is equal to or greater than the threshold value, the compressor 11 is used depending on whether the weight value or the added value of the weight value is near the threshold value or not. The timing of stopping will be different. That is, when the weight value or the added value of the weight values is large, the timing at which the compressor 11 stops is earlier than when the weight value is not so. For this reason, it is desirable that the control valve operation instruction unit 54 opens the solenoid valve 31 earlier when the weight value or the added value of the weight values is larger than when it is not. This is because it is possible to prevent a situation in which the timing for the opening operation is delayed and the compressor 11 stops.

  Next, how the compressor 11 is prevented from being stopped by the cooling control system 1 will be described. FIG. 10 is a diagram illustrating a state in which the stop of the compressor 11 is prevented by the control valve operation instruction unit 54 illustrated in FIG. 2. Conventionally, the compressor 11 stops at times t10 to t11 when all the solenoid valves 31a to 31e are closed. However, when the priority of the fifth electromagnetic valve 31e is “1” in the present embodiment, the centralized management controller 50 shifts the timing of the opening operation of the fifth electromagnetic valve 31e of the fifth showcase 30e. Thereby, the cooling control system 1 prevents the compressor 11 from stopping. Note that the central management controller 50 may prevent the compressor 11 from stopping by extending the opening time to the time t11 for the fifth electromagnetic valve 31e that should be closed at the time t12.

  FIG. 11 is a second diagram showing how the control valve operation instruction unit 54 shown in FIG. 2 prevents the compressor 11 from being stopped. Conventionally, when two or more solenoid valves 31 out of the plurality of solenoid valves 31a to 31e are closed within a certain time (time t13 to t14), the compressor 11 stops. However, when the priority of the third electromagnetic valve 31c is “1” in the present embodiment, the centralized management controller 50 extends the opening time of the third electromagnetic valve 31c of the third showcase 30c. Thereby, the cooling control system 1 prevents the compressor 11 from stopping. The central control controller 50 may prevent the compressor 11 from stopping by shifting the opening operation to the time t14 for the third solenoid valve 31c that should open at the time t15.

  In the above description, the solenoid valve 31 that extends the opening operation or the opening time is determined based on the priority order. However, the invention is not limited to this, and the electromagnetic valve 31 that extends the opening operation or the opening time is determined based on the weight value. Also good. That is, the control valve operation instruction unit 54 may extend the opening operation or the opening time for the electromagnetic valve 31 having the highest weight value. In this case, the weight setting unit 56 functions as the priority order determination unit 52.

  Next, the cooling control method according to the present embodiment will be described. FIG. 12 is a flowchart showing an example of the cooling control method according to the present embodiment, and shows details of the learning process and the weight setting process. As shown in FIG. 12, first, the data collection unit 51 collects data for a certain period of time regarding the on / off signals of the plurality of solenoid valves 31 a to 31 e and the internal temperature transitions and set temperatures of the plurality of showcases 30 a to 30 e. (Step S1).

  Next, the priority order determination part 52 calculates the average operation rate R and the average continuous open time L of each showcase 30a-30e based on the on-off signal of each solenoid valve 31a-31e (step S2). Thereafter, the pattern division unit 52a selects one of the plurality of showcases 30a to 30e (step S3). And the pattern division part 52a judges whether the average driving rate R of the showcase 30 selected in step 3 is more than the driving rate threshold value R1 (step S4).

  When it is determined that the average operation rate R is equal to or greater than the operation rate threshold R1 (step S4: YES), the pattern division unit 52a determines whether or not the average continuous opening time L is equal to or greater than the time threshold L1 (step S5). ). When it is determined that the average continuous opening time L is equal to or longer than the time threshold L1 (step S5: YES), the pattern division unit 52a determines the electromagnetic valve 31 of the selected showcase 30 as the pattern 1 (step S6). Then, the process proceeds to step S11.

  On the other hand, when it is determined that the average continuous opening time L is not equal to or greater than the time threshold L1 (step S5: NO), the pattern dividing unit 52a determines the electromagnetic valve 31 of the selected showcase 30 as the pattern 2 (step S7). Then, the process proceeds to step S11.

  When it is determined that the average operation rate R is not equal to or greater than the operation rate threshold R1 (step S4: NO), the pattern division unit 52a determines whether the average continuous opening time L is equal to or greater than the time threshold L1 as in step S5. Is determined (step S8).

  When it is determined that the average continuous opening time L is equal to or greater than the time threshold L1 (step S8: YES), the pattern division unit 52a determines the electromagnetic valve 31 of the selected showcase 30 as the pattern 3 (step S9). Then, the process proceeds to step S11. On the other hand, when it is determined that the average continuous opening time L is not equal to or greater than the time threshold L1 (step S8: NO), the pattern division unit 52a determines the electromagnetic valve 31 of the selected showcase 30 as the pattern 4 (step S10). Then, the process proceeds to step S11.

  In step S11, the priority determining unit 52 calculates the average area of the portion exceeding the set temperature as described with reference to FIG. 5 (step S11). Thereafter, the priority determining unit 52 determines whether the average area is equal to or larger than the area threshold (step S12). When it is determined that the average area is equal to or larger than the area threshold (step S12: YES), the priority determining unit 52 sets the area to “large” for the electromagnetic valve 31 of the selected showcase 30 (step S13). Then, the process proceeds to step S15.

  On the other hand, when it is determined that the average area is not equal to or larger than the area threshold (step S12: NO), the priority determining unit 52 sets the area to “small” for the electromagnetic valve 31 of the selected showcase 30 (step S14). Then, the process proceeds to step S15.

  In step S15, the priority order determination unit 52 determines whether or not the processing of steps S4 to S14 has been executed for all the showcases 30a to 30e (step S15). When it is determined that the processing of step S4 to step S14 is not executed for all the showcases 30a to 30e (step S15: NO), the process proceeds to step S3, and an unselected showcase 30 is selected. It will be selected in step S3.

  On the other hand, when it is determined that the processing of steps S4 to S14 has been executed for all the showcases 30a to 30e (step S15: YES), the priority order determination unit 52 performs steps S6, S7, S9, and From the pattern information determined in step S10 and the size information of the areas determined in step S13 and step S14, priority is determined for each of the plurality of solenoid valves 31a to 31e (step S16).

  Thereafter, the weight setting unit 56 sets a weight numerical value based on the set temperature information of each showcase 30a-30e (step S17). Thereafter, the process shown in FIG. 12 ends. The process shown in FIG. 12 may be executed only during a period from when the cooling control system 1 starts to be used until a certain period elapses, or may be always executed. Good.

  Next, an example of the cooling control method according to the present embodiment will be described with reference to a flowchart. In the following flowchart, opening the solenoid valve 31 that is already open means extending the opening time of the solenoid valve 31. Therefore, the process for extending the opening time is clearly shown in the flowchart. Not supposed to.

  13 and 14 are flowcharts showing an example of the cooling control method according to the present embodiment, showing details of the control processing of the electromagnetic valves 31a to 31e. As illustrated in FIG. 13, the stop prediction unit 53 collects the internal temperature information and the set temperature information of the plurality of showcases 30a to 30e (step S21).

  Next, for each of the plurality of showcases 30a to 30e, the stop prediction unit 53 determines each of the solenoid valves 31a to 31e at time tc from information on the temperature transition in the cabinet between time ta and time tb and the set temperature. A state is predicted (step S22).

  Note that the stop prediction unit 53 may perform the following process instead of the process of steps S21 to S22. That is, the stop predicting unit 53 reads the information on the on / off cycle of the plurality of solenoid valves 31a to 31e from the cycle storage unit 55, and predicts the state of each of the solenoid valves 31a to 31e at time tc from the on / off cycle information. May be. In addition, the stop prediction unit 53 may use both the on / off cycle information and the temperature difference information, and may supplement the other with one result, for example, to increase the accuracy.

  Next, the stop prediction unit 53 determines whether or not all of the plurality of electromagnetic valves 31a to 31e are closed at time tc (step S23). When it is determined that the plurality of solenoid valves 31a to 31e are all closed at time tc (step S23: YES), the control valve operation instruction unit 54 selects the solenoid valve 31 with the highest priority and performs control. The valve operation instruction unit 54 reads from the weight setting unit 56 information on the weight value D of the electromagnetic valve 31 that is predicted to be in the closed state at the end (step S24). Then, the process proceeds to step S29.

  On the other hand, when it is determined that the plurality of solenoid valves 31a to 31e are not all closed at time tc (step S23: NO), the stop predicting unit 53 has the solenoid valve 31 that performs the closing operation within a predetermined time. It is determined whether or not (step S25). When it is determined that there is no electromagnetic valve 31 that performs the closing operation within a certain time (step S25: NO), the stop prediction unit 53 determines that the compressor 11 does not stop, and the processing illustrated in FIGS. 13 and 14 ends. .

When it is determined that there is an electromagnetic valve 31 that closes within a certain time (step S25: YES), the stop prediction unit 53 adds the weight value of the electromagnetic valve 31 that closes within a certain time and adds the _sum D _sum. Is calculated (step S26). Thereafter, the stop prediction unit 53 determines whether or not the added value D _sum is equal to or greater than the threshold value U (step S27).

When it is determined that the addition value D _sum is not equal to or greater than the threshold value U (step S27: NO), the stop prediction unit 53 determines that the compressor 11 does not stop, and the processing illustrated in FIGS. 13 and 14 ends. On the other hand, when it is determined that the added value D _sum is equal to or greater than the threshold value U (step S27: YES), the stop prediction unit 53 determines that the compressor 11 is stopped, and the process proceeds to step S28. Even when the plurality of solenoid valves 31 are closed within a certain time and the added value D _sum of the weight values is equal to or greater than the threshold value U, the other solenoid valves 31 are opened within the certain time. There is. In this case, the stop predicting unit 53 subtracts the weight value of the solenoid valve 31 that is opened from the added value D _sum and compares the value after subtraction with the threshold value U. The stop prediction unit 53 determines that the compressor 11 does not stop when it determines that the value after subtraction does not exceed the threshold U, and stops the compressor 11 when it determines that the value after subtraction exceeds the threshold U. Judge that.

In step S28, the control valve operation instructing unit 54 selects at least one solenoid valve from the solenoid valve 31 having the highest priority among the solenoid valves 31 in the closed state so that D _sum −D _{off → on} <U. 31 is selected (step S28). Here, D _{off → on} is a weight value of the solenoid valve 31 that is opened from the closed state (addition value of weight values when a plurality of solenoid valves 31 are opened). Thereafter, the process proceeds to step S29.

In step S29, the control valve operation instruction unit 54 determines whether or not the weight value D of the electromagnetic valve 31 predicted to be in the closed state lastly or the added value D _sum calculated in step S26 is equal to or greater than a predetermined value. (Step S29). Note that the predetermined value compared with the weight value D of the electromagnetic valve 31 predicted to be in the closed state at the end is different from the predetermined value compared with the addition value D _sum calculated in step S26.

When the weight value D of the solenoid valve 31 that is predicted to be in the closed state at the end is equal to or greater than the predetermined value, or when the addition value D _sum calculated in step S26 is equal to or greater than the predetermined value, the compressor 11 stops early. It can be said that. For example, when the added value D _sum is large, the gas pressure rapidly decreases from the target pressure to the compressor stop pressure, so the compressor 11 stops early.

Finally, when it is determined that the weight value D of the solenoid valve 31 predicted to be in the closed state is not less than a predetermined value, or when it is determined that the added value D _sum calculated in step S26 is not less than the predetermined value (step (S29: YES), the control valve operation instructing unit 54 sets the selected solenoid valve 31 to be opened earlier. That is, the control valve operation instruction unit 54 opens the selected electromagnetic valve 31 at time td before time tc (that is, timing when the compressor stops) at which all the electromagnetic valves 31a to 31e are closed at time tc. (Step S29). Alternatively, the control valve operation instruction unit 54 selects the selected electromagnetic valve 31 at a time tf before the time te when the electromagnetic valve 31 scheduled to be closed first among the electromagnetic valves 31 that are closed within a certain time. It sets so that it may open | release operation (step S30). Then, the process proceeds to step S32. Thereby, before the compressor 11 stops, the specific solenoid valve 31 is appropriately opened.

When the weight value D of the solenoid valve 31 that is predicted to be in the closed state at last is not equal to or greater than the predetermined value, or when the addition value D _sum calculated in step S26 is not equal to or greater than the predetermined value, the compressor 11 is more than in the case described above. It will stop later. For this reason, when it is determined that the weight value D of the solenoid valve 31 that is predicted to be in the closed state at the end is not greater than or equal to the predetermined value, or when the addition value D _sum calculated in step S26 is not greater than or equal to the predetermined value ( Step S29: NO), the control valve operation instructing unit 54 opens the selected solenoid valve 31 at time tc (that is, when the compressor stops) at which all the solenoid valves 31a to 31e are closed at time tc. (Step S31). Alternatively, the control valve operation instructing unit 54 opens the selected electromagnetic valve 31 at the time te when the electromagnetic valve 31 scheduled to be closed first among the electromagnetic valves 31 that are closed within a certain time. (Step S31). Then, the process proceeds to step S33.

  In step S33, the control valve operation instructing unit 54 determines whether it is the timing (opening timing) for opening the electromagnetic valve 31 set in step S30 or step S31 (step S32). When it is determined that it is not the opening timing (step S32: NO), this process is repeated until it is determined that it is the opening timing. On the other hand, when it is determined that it is the opening timing (step S32: YES), the control valve operation instruction unit 54 opens the electromagnetic valve 31 selected in step S24 or step S28 (step S33).

  Thereafter, the control valve operation instruction unit 54 sets a flag for the electromagnetic valve 31 to be opened (step S34). Then, the centralized management controller 50 determines whether there is an open valve among the solenoid valves 31 that are not flagged in step S34 (FIG. 14: step S35). If it is determined that there is no solenoid valve 31 that does not perform the opening operation (NO in step S35), this process is repeated until it is determined that there is an electromagnetic valve 31 that performs the opening operation.

  On the other hand, when it is determined that there is an electromagnetic valve 31 that is not set to be opened (step S35: YES), the control valve operation instructing unit 54 closes the flagged electromagnetic valve 31 ( Step S36). Then, the central management controller 50 deletes the flag (step S37). Thereafter, the processing illustrated in FIGS. 13 and 14 ends. The processes shown in FIGS. 13 and 14 are repeatedly executed until the cooling control system 1 is turned off. Even in the case where all the electromagnetic valves 31a to 31e are in the closed state in step S23, there may be electromagnetic valves 31 that simultaneously perform the closing operation within a certain time. In such a case, even if “YES” is determined in step S23, the process may proceed to step S25.

  FIG. 15 is a second flowchart showing an example of the cooling control method according to the present embodiment, and shows details of control processing of the solenoid valves 31a to 31e. The central management controller 50 may execute the process shown in FIG. 15 instead of the process shown in FIG. In the processing shown in FIG. 15, the weight values are set as priorities as they are, and the stop of the compressor 11 is prevented based on the weight values of the electromagnetic valves 31 a to 31 e. For this reason, in the process shown in FIG. 15, the weight setting unit 56 functions as the priority order determination unit 52. Note that the processing in steps S41 to S43, S45 to S47, and steps S49 to S54 shown in FIG. 15 is the same as the processing in steps S21 to S23, S25 to S27, and steps S29 to S34 shown in FIG. Description is omitted.

  In step S44, the control valve operation instruction unit 54 selects at least one electromagnetic valve 31 from the electromagnetic valves 31 having a large weight value (step S44). Further, the control valve operation instruction unit 54 reads from the weight setting unit 56 information on the weight value D of the electromagnetic valve 31 that is predicted to be in the closed state last. Then, the process proceeds to step S49.

In step S48, the control valve operation instruction unit 54 selects at least one solenoid valve 31 from the solenoid valves 31 having a large weight value so that D _sum −D _{off → on} <U (step S48). Thereafter, the process proceeds to step S49.

  The process shown in FIG. 15 is repeatedly executed until the power supply of the cooling control system 1 is turned off. Even in the case where all the electromagnetic valves 31a to 31e are in the closed state in step S43, there may be electromagnetic valves 31 that simultaneously perform the closing operation within a certain time. In such a case, even if “YES” is determined in step S43, the process may proceed to step S45.

  In this way, according to the present embodiment, the priority order indicating the order of opening is determined, the timing at which the compressor 11 stops is predicted, and the priority order is high at the timing at which the compressor 11 stops. At least one electromagnetic valve 31 is opened in order from the first one. For this reason, the situation where the compressor 11 stops by the obstruction | occlusion of the solenoid valve 31 can be prevented. Therefore, the number of stops of the compressor 11 can be reduced to save energy.

  In addition, in order to lower the priority of the solenoid valves 31 that are opened at the timing when the compressor 11 stops, one solenoid valve 31 is frequently opened and the temperature of one showcase 30 decreases. Can be suppressed.

  Moreover, the timing at which the solenoid valve 31 is closed is predicted from the internal temperature transition of each showcase 30a to 30e and the set temperature. For this reason, the closing timing of each solenoid valve 31a-31e can be calculated | required correctly based on the relationship between the chamber internal temperature of showcase 30a-30e, and preset temperature. Further, when all the solenoid valves 31a to 31e are in the closed state based on the information on the accurately obtained closing timing, or when two or more solenoid valves 31 are closed within a certain time, the compressor 11 Predict that it is time to stop. For this reason, the timing at which the compressor 11 stops can be predicted.

  Moreover, when all the solenoid valves 31a-31e will be in the obstruction | occlusion state based on the information of the period when the several solenoid valves 31a-31e perform the obstruction | occlusion operation | movement and an open | release operation | movement, or two or more solenoid valves 31 within a fixed time It is predicted that it is the timing when the compressor 11 stops when the closing operation is performed. For this reason, when all the solenoid valves 31a to 31e are in a closed state, or when two or more solenoid valves 31 are closed within a certain time, from the direct information that the solenoid valves 31a to 31e are closed. Therefore, it is predicted that it is the timing at which the compressor 11 stops, and the timing at which the compressor 11 stops can be predicted.

  Further, the timing at which the compressor 11 stops is predicted from the weights of the two or more solenoid valves 31 that perform the closing operation within a predetermined time. Here, if two or more solenoid valves 31 are closed within a certain time, the refrigerant gas pressure causes an undershoot to cause the compressor 11 to stop. However, even if the refrigerant gas pressure causes an undershoot, the gas pressure does not increase. When the compressor stop pressure is not reached, the compressor 11 does not stop. For this reason, by predicting the timing at which the compressor 11 stops from the weight of the solenoid valve 31 that performs the closing operation within a certain time, it is determined whether or not the gas pressure causes an undershoot to reach the compressor stop pressure. Therefore, the prediction accuracy of the timing when the compressor 11 stops can be improved.

  The weight for each solenoid valve 31 is a weight value, and the stop prediction process of the compressor 11 is numerically performed in order to predict the stop of the compressor 11 from the added value of the weight value of the solenoid valve 31 that is closed within a certain time. It can be executed easily. Furthermore, in order to prevent the stop of the compressor 11, it is only necessary to subtract the weight value of the electromagnetic valve 31 to be opened to determine whether the value is less than the threshold value, and the stop prevention process of the compressor 11 is simply executed with the value. be able to.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, in the said embodiment, although the solenoid valves 31a-31e were provided in the showcases 30a-30e, it is not restricted to this, You may be provided in the branch piping 21a-21e.

  Furthermore, in the above embodiment, the case where the object to be cooled is the showcases 30a to 30e has been described as an example. However, the present invention is not limited to this, and the cooling control system 1 is applied to an air conditioner control system or the like. It may be.

It is a schematic block diagram of the cooling control system which concerns on this embodiment. It is a detailed block diagram of the centralized management controller shown in FIG. It is the figure which showed the information collected by the data collection part shown in FIG. 2, (a) shows the information of the internal temperature transition and the information of preset temperature, (b) shows the information of the on-off period of a solenoid valve. Show. FIG. 3 is a diagram for explaining pattern division performed by the pattern division unit shown in FIG. 2, (a) shows an example of pattern 1, (b) shows an example of pattern 2, and (c) shows an example of pattern 3. (D) shows an example of the pattern 4. It is a figure which shows calculation of the area by the priority determination part shown in FIG. 2, (a) shows a 1st example and (b) has shown the 2nd example. It is a figure which shows the flexibility of a solenoid valve, and the reason for determination of a priority, (a) and (b) show the flexibility of a solenoid valve, (c) and (d) show the reason for determination of the priority by area FIG. It is a figure which shows a mode that a compressor stops when two or more of several electromagnetic valves operate | move in a fixed time, (a)-(d) shows the example which an electromagnetic valve carries out blockage operation | movement sequentially , (E) to (h) show examples of simultaneous closing operation within a certain time. It is a figure explaining operation | movement prediction of the solenoid valve by the stop prediction part shown in FIG. It is a 2nd figure explaining operation | movement prediction of the solenoid valve by the stop prediction part shown in FIG. It is a figure which shows a mode that the stop of a compressor is prevented by the operation instruction | indication part shown in FIG. 2, (a) shows a compressor frequency, (b) shows the state of the solenoid valve of a 1st showcase, (c ) Shows the state of the solenoid valve of the second showcase, (d) shows the state of the solenoid valve of the third showcase, (e) shows the state of the solenoid valve of the fourth showcase, and (f) shows The state of the solenoid valve of the 5th showcase is shown. It is the 2nd figure which shows a mode that the stop of a compressor is prevented by the operation instruction part shown in Drawing 2, (a) shows compressor frequency, and (b) shows the state of the electromagnetic valve of the 1st showcase. (C) shows the state of the solenoid valve of the second showcase, (d) shows the state of the solenoid valve of the third showcase, (e) shows the state of the solenoid valve of the fourth showcase, f) shows the state of the solenoid valve of the fifth showcase. It is a flowchart which shows an example of the cooling control method which concerns on this embodiment, and has shown the detail of the learning process and the weight setting process. It is a flowchart which shows an example of the cooling control method which concerns on this embodiment, and has shown the detail of the first half part of the control processing of a solenoid valve. It is a flowchart which shows an example of the cooling control method which concerns on this embodiment, and has shown the detail of the second half part of the control processing of a solenoid valve. It is a 2nd flowchart which shows an example of the cooling control method which concerns on this embodiment, and has shown the detail of the first half part of the control processing of a solenoid valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cooling control system 10 ... Refrigerator 11 ... Compressor 12 ... Condenser 20 ... Refrigerant supply piping (refrigerant piping)
21a-21e ... Branch piping 30 ... Showcase (cooling target device)
31a-31e ... Solenoid valve (control valve)
32a to 32e ... expansion valve 33a to 33e ... evaporator 40 ... refrigerant discharge pipe (refrigerant pipe)
50 ... Centralized management controller (cooling control controller)
DESCRIPTION OF SYMBOLS 51 ... Data collection part 52 ... Priority order determination part 52a ... Pattern division part 53 ... Stop prediction part 54 ... Control valve operation instruction part 55 ... Period storage part 56 ... Weight setting part

Claims (9)

Multiple cooling objects,
A compressor for pumping refrigerant;
A refrigerant pipe connecting a plurality of objects to be cooled and the compressor in a parallel relationship;
A control valve that is provided for each cooling target device and controls the inflow of the refrigerant pumped by the compressor through the refrigerant pipe to the cooling target device by an opening operation and a closing operation;
A cooling control controller that opens and closes the control valve, and
The controller is configured to determine a priority order of control valves to be opened at a timing at which the compressor stops based on a stop prediction unit that predicts a timing at which the compressor stops and information on the plurality of cooling target devices. Control valve operation that opens at least one control valve in order from the highest priority determined by the priority determination unit at the timing when the compressor predicted by the rank determination unit and the stop prediction unit stops A cooling control system comprising: an instruction unit. The cooling control system according to claim 1, wherein the priority order determination unit lowers the priority order of the control valves that are opened at the timing when the compressor stops. The stop prediction unit predicts the timing at which the control valve is closed and opened from the temperature transition of each cooling target device and the set temperature, and all the control valves are closed based on the information on the timing at which the control valve is closed and opened. The timing when the compressor stops is predicted when a state is reached or when two or more control valves of a plurality of control valves are closed within a predetermined time. The cooling control system according to any one of 2. The stop prediction unit is configured such that when all the control valves are in a closed state based on information on a cycle in which the plurality of control valves perform the closing operation and the opening operation, or two or more control valves among the plurality of control valves are The cooling control system according to any one of claims 1 to 3, wherein it is predicted that it is a timing at which the compressor stops when the closing operation is performed within a predetermined time. When two or more control valves among a plurality of control valves are closed within a certain time, the stop prediction unit is configured to perform a certain time among the weights for each control valve set according to the cooling load of each cooling target device. The cooling control system according to any one of claims 3 and 4, wherein the timing at which the compressor stops is predicted from the weight of the control valve that is closed inside. The weight for each control valve is a weight value,
The stop prediction unit adds a weight value of a control valve that performs a closing operation within a predetermined time, and predicts that the compressor stops when the addition value obtained by the addition is equal to or greater than a preset threshold value,
The control valve operation instructing unit opens at least one control valve in descending order of priority, thereby subtracting a value obtained by subtracting the weight value of the control valve to be opened from the added value to be less than the threshold value. The cooling control system according to claim 5. A cooling control controller that is provided for each of a plurality of objects to be cooled and that opens and closes a control valve that controls the flow of refrigerant pumped by a compressor into the objects to be cooled by an opening operation and a closing operation,
A stop prediction unit that predicts when the compressor stops;
A priority order determining unit that determines the priority order of control valves to be opened at the timing when the compressor is stopped based on the information of the plurality of cooling target devices;
A control valve operation instruction unit that opens at least one control valve in order from the highest priority determined by the priority determination unit at the timing when the compressor predicted by the stop prediction unit stops;
A cooling control controller comprising: In order to cause a cooling control controller, which is provided for each of the plurality of objects to be cooled, to control the inflow of the refrigerant pumped by the compressor to the object to be cooled by the opening operation and the closing operation, and to perform the opening operation and the closing operation. A cooling control program for
A stop prediction step for predicting when the compressor stops;
A priority order determining step for determining a priority order of control valves to be opened at a timing when the compressor stops based on information of the plurality of cooling target devices;
A control valve operation instruction step for opening at least one control valve in order from the highest priority determined in the priority determination step at the timing when the compressor predicted in the stop prediction step stops;
The cooling control program characterized by performing. A cooling control method for opening and closing a control valve provided for each of a plurality of objects to be cooled and controlling the flow of refrigerant pumped by a compressor into the object to be cooled by an opening operation and a closing operation,
A stop prediction step for predicting when the compressor stops;
A priority order determining step for determining a priority order of control valves to be opened at a timing when the compressor stops based on information of the plurality of cooling target devices;
A control valve operation instruction step for opening at least one control valve in order from the highest priority determined in the priority determination step at the timing when the compressor predicted in the stop prediction step stops;
A cooling control method characterized by comprising:

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