JP6044483B2 - Temperature control device for vehicles - Google Patents

Description

  The present invention relates to a vehicle temperature control device including a plurality of refrigeration cycle devices that circulate refrigerant discharged from each of a plurality of electric compressors to adjust the temperature of a temperature control object.

  Conventionally, when distributing supply power to multiple devices, the power consumption of each device is predicted and the power that satisfies the predicted power consumption is allocated, and if the supply power is insufficient, power is supplied to devices with low priority Is known (for example, see Patent Document 1 below).

JP 2010-170369 A

  However, in the case where the plurality of devices in the above-described conventional device are electric compressors provided in each of the plurality of refrigeration cycle devices that adjust the temperature of the temperature adjustment object mounted on the vehicle, If power distribution is performed, problems may occur. For example, when a relatively large amount of power is supplied to the electric compressor of the refrigeration cycle apparatus having a relatively small coefficient of performance, which is an operation efficiency, there is a problem in that the efficiency of the entire plurality of refrigeration cycle apparatuses decreases. Thus, there exists a problem that a some refrigerating-cycle apparatus cannot be drive | operated efficiently.

  This invention is made | formed in view of the said point, and aims at providing the temperature control apparatus for vehicles which can drive | operate a some refrigeration cycle apparatus efficiently.

In order to achieve the above object, in the present invention,
Comprising control means (5) for controlling the drive of the plurality of electric compressors (1, 2);
The control means
The suppliable power that can be supplied from the power supply (220, 230) to the plurality of electric compressors is distributed as the allowable power consumption of each of the plurality of electric compressors, and each electric compressor is within the range of the allowable power consumption. Drive control,
Based on the ratio of the coefficient of performance of the plurality of refrigeration cycle apparatuses (11, 12), the allowable consumption for the plurality of electric compressors is such that the allowable power consumption increases as the electric compressor of the refrigeration cycle apparatus having a large coefficient of performance. It is characterized by distributing power.

  According to this, power that can be supplied from the power supply to the plurality of electric compressors can be distributed as allowable power consumption to the plurality of electric compressors based on the ratio of the coefficient of performance of the plurality of refrigeration cycle apparatuses. . In that case, the allowable power consumption of the electric compressor can be increased as the refrigeration cycle apparatus having a higher coefficient of performance. That is, the power that can be supplied can be preferentially distributed to the electric compressor of the refrigeration cycle apparatus having high operating efficiency. Therefore, it is possible to improve the overall efficiency of the plurality of refrigeration cycle apparatuses. That is, a plurality of refrigeration cycle apparatuses can be operated efficiently.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a block diagram which shows schematic structure of the refrigerator 100 and the hybrid system 200 which are the temperature control apparatuses for vehicles in 1st Embodiment to which this invention is applied. It is a flowchart which shows a part of compressor drive control operation of the control unit 5 of 1st Embodiment. It is a flowchart which shows the remainder of the compressor drive control operation | movement of the control unit 5 of 1st Embodiment. It is a flowchart which shows an example of control operation at the time of the compressor starting of the control unit 5 of 1st Embodiment.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
A first embodiment to which the present invention is applied will be described with reference to FIGS. A refrigerator 100 that is a temperature control device for a vehicle according to the present embodiment shown in FIG. 1 is mounted on, for example, a hybrid vehicle that includes an engine 210 and a generator 220 that functions as a motor as a driving force source. The refrigerator 100 includes a plurality of (two in this example) refrigeration cycle apparatuses 11 and 12, an auxiliary device 3, a power supply circuit 4, and a control unit 5.

  The refrigeration cycle apparatus 11 has an electric compressor 1. The refrigeration cycle apparatus 11 circulates the refrigerant compressed and discharged by the electric compressor 1 in the cycle, for example, absorbs heat from the internal air 21 of the freezer 20 mounted on the vehicle and dissipates it to the outside air. 21 is cooled and the temperature is adjusted.

  In addition, the refrigeration cycle apparatus 12 has an electric compressor 2. The refrigeration cycle apparatus 12 circulates the refrigerant compressed and discharged by the electric compressor 2 in the cycle, for example, absorbs heat from the internal air 31 of the refrigerator 30 mounted on the vehicle and dissipates it to the outside air. 31 is cooled and temperature-controlled. The internal air 21 and 31 corresponds to a temperature control object that is temperature-controlled by the plurality of refrigeration cycle apparatuses 11 and 12 in the present embodiment.

  Each of the electric compressors 1 and 2 includes a motor and a compression mechanism that is rotationally driven by the motor, and is a compressor that can change the refrigerant discharge capacity of the compression mechanism by changing the motor rotation speed. The auxiliary machine 3 is, for example, an outdoor fan motor, an internal fan motor, a valve for switching the refrigerant flow state, and the like included in each of the refrigeration cycle apparatuses 11 and 12. The auxiliary machine 3 is an electric device in which power consumption during driving is fixed to a predetermined value, for example. The power supply circuit 4 is a circuit for performing DC / DC conversion of power from the power supply and supplying it to the electric compressors 1 and 2, the auxiliary machine 3, and the like. The power supply circuit 4 can also supply power to the electric compressors 1, 2, the auxiliary machine 3, etc. by AC / DC conversion of power supplied from an external AC power supply, for example.

  The control unit 5 outputs control signals to the electric compressors 1 and 2, the auxiliary machine 3, the power supply circuit 4, and the like to control the operation of each component. The control unit 5 monitors the internal temperature of the freezer 20 and the refrigerator 30, that is, the temperature of the internal air 21, 31, and each internal temperature is set to store the cargo in the internal storage. The refrigeration cycle apparatuses 11 and 12 are operated so that the temperature is reached. The control unit 5 corresponds to a control unit that performs drive control of the plurality of electric compressors 1 and 2 for adjusting the temperature of the internal air 21 and 31. Each electric compressor 1, 2 has a function of feeding back power consumption to the control unit 5.

  The hybrid system 200 mounted on the hybrid vehicle of this embodiment includes an engine 210, a generator 220 that also functions as a motor, a battery 230, and a hybrid system computer 240. Hereinafter, the generator 220 may be referred to as a motor 220. Further, the hybrid system computer 240 may be referred to as an HVECU 240.

  The power of the engine 210 is used not only for driving the tire 300 but also for driving the generator 220. The generator 220 is also activated by the driving force from the tire 300 during braking to generate power. The generator 220 regenerates kinetic energy and converts it into electrical energy when braking the vehicle.

  The electric power generated by the generator 220 can be stored in the battery 230 and can also be supplied to devices such as the electric compressors 1 and 2 of the refrigerator 100. The electric power stored in the battery 230 can be used to drive the motor 220 and can also be supplied to each device such as the electric compressors 1 and 2 of the refrigerator 100.

  The HVECU 240 performs operation control of the engine 210 and the generator 220 and charge / discharge control of the battery 230. The generator 220 and the battery 230 are power supplies that supply electric power to each device such as the electric compressors 1 and 2 of the refrigerator 100. Information regarding the power that can be supplied from the power supply to the refrigerator 100 is output from the HVECU 240 to the control unit 5.

  Next, the control operation performed by the control unit 5 of the refrigerator 100 based on the above configuration will be described.

  As shown in FIG. 2, the control unit 5 first inputs power information that can be supplied from the battery 230 and the generator 220 to the refrigerator 100 based on the input information from the HVECU 240 (step 400). That is, in step 400, the total allowable power consumption of the refrigerator 100 is input.

  Once the total allowable power consumption of the refrigerator 100 is input in step 400, the allowable power consumption that can be used by both the electric compressors 1 and 2 is calculated (step 410). In step 410, for example, the allowable power consumption of both the electric compressors 1 and 2 is calculated by subtracting the power consumption of the auxiliary machine 3 from the total allowable power consumption input in step 400. In step 410, the suppliable power that can be supplied from the power supply to both the electric compressors 1 and 2 is calculated.

  When step 410 is executed, the allowable power consumption of both the electric compressors 1 and 2 is allocated based on the ratio of the coefficient of performance COP, which is the operation efficiency of the refrigeration cycle apparatuses 11 and 12, and the respective allowable electric compressors 1 and 2 are allowed. Calculate power consumption. That is, the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2 are calculated (step 420). Hereinafter, the coefficient of performance may be simply referred to as COP. For example, when the ratio between the COP of the refrigeration cycle apparatus 11 and the COP of the refrigeration cycle apparatus 12 is 55:45, in step 420, the individual allowable power consumption of the electric compressor 1 and the individual allowable consumption of the electric compressor 2 The ratio with electric power is also distributed as 55:45.

  As the COP of the refrigeration cycle apparatuses 11 and 12 used in step 420, for example, a fixed value in a typical operation state can be used. In addition, the COPs of the refrigeration cycle apparatuses 11 and 12 may be appropriately extracted from a table that stores COPs in a plurality of operating states, for example. Further, the COPs of the refrigeration cycle apparatuses 11 and 12 may be calculated each time information relating to the operating state is detected when step 420 is executed, for example.

  When step 420 is executed, the calculation result of step 420 is set as the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2 (step 430). After step 430 is executed, the electric compressor 1 and the electric compressor 2 are controlled for operation based on the individual allowable power consumption set in step 430, as shown in FIG.

  As shown in FIG. 3, for the electric compressor 1, the control unit 5 first acquires the actual power consumption that the electric compressor 1 is actually using at that time (step 500). Then, it is determined whether or not the actual power consumption acquired in step 500 has reached the individual allowable power consumption of the electric compressor 1 set in step 430 (step 510).

  If it is determined in step 510 that the actual power consumption of the electric compressor 1 has not reached the individual allowable power consumption, the process proceeds to step 520, and whether or not the rotational speed of the electric compressor 1 has reached the target rotational speed. Judge. If it is determined in step 520 that the rotational speed of the electric compressor 1 has not reached the target rotational speed, the rotational speed of the electric compressor 1 is changed to be close to the target rotational speed (step 530). When the rotation speed of the electric compressor 1 is lower than the target rotation speed, the rotation speed of the electric compressor 1 is increased. After step 530 is executed, the process returns to step 500.

  In step 530, the rotational speed of the electric compressor 1 may be changed so as to coincide with the target rotational speed, but the rotational speed is gradually changed with the rotational speed change amount per rotation as a predetermined amount. It is preferable that the rotational speed is gradually brought close to the target rotational speed by executing step 530.

  If it is determined in step 520 that the rotational speed of the electric compressor 1 has reached the target rotational speed, the rotational speed of the electric compressor 1 is fixed (step 540). When step 540 is executed, the electric compressor 1 is driven at the target rotational speed without using up the individual allowable power consumption, and there is an unused surplus in the individual allowable power consumption. Therefore, the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2 are transferred so that the surplus of the individual allowable power consumption of the electric compressor 1 is transferred to the individual allowable power consumption of the electric compressor 2. Are recalculated (step 440). Then, the process returns to step 430 shown in FIG. 2 to reset the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2.

  If it is determined in step 510 that the actual power consumption of the electric compressor 1 has reached the individual allowable power consumption, the process proceeds to step 550, and whether or not the rotational speed of the electric compressor 1 has reached the target rotational speed. Judge. If it is determined in step 550 that the rotational speed of the electric compressor 1 has reached the target rotational speed, the rotational speed of the electric compressor 1 is fixed (step 560). After step 560 is executed, the process returns to step 400 in FIG. However, as for the return to step 400, any one of step 640, step 660, and step 670 for fixing the rotational speed of the electric compressor 2 in the control of the electric compressor 2 described later is executed in accordance with the execution of step 560. Is done when.

  If it is determined in step 550 that the rotational speed of the electric compressor 1 has not reached the target rotational speed, the individual allowable power consumption has been used up, so the rotational speed of the electric compressor 1 is fixed (step 570). ). When step 570 is executed, the process returns to step 500. When the process returns to step 500 and the individual allowable power consumption of the electric compressor 1 is reset by passing the surplus of the individual allowable power consumption of the electric compressor 2, which will be described later, the electric compression is performed by the control after step 510. The rotation speed of the machine 1 may be changed.

  On the other hand, after executing step 430 shown in FIG. 2, the control unit 5 first determines the actual power consumption actually used by the electric compressor 2 at that time for the electric compressor 2 as shown in FIG. 3. Obtain (step 600). Then, it is determined whether or not the actual power consumption acquired in step 600 has reached the individual allowable power consumption of the electric compressor 2 set in step 430 (step 610).

  When it is determined in step 610 that the actual power consumption of the electric compressor 2 has not reached the individual allowable power consumption, the process proceeds to step 620, and whether or not the rotational speed of the electric compressor 2 has reached the target rotational speed. Judge. If it is determined in step 620 that the rotational speed of the electric compressor 2 has not reached the target rotational speed, the rotational speed of the electric compressor 2 is changed to approach the target rotational speed (step 630). When the rotation speed of the electric compressor 2 is lower than the target rotation speed, the rotation speed of the electric compressor 2 is increased. After step 630 is executed, the process returns to step 600.

  In step 630, the rotational speed of the electric compressor 2 may be changed so as to coincide with the target rotational speed, but the rotational speed is gradually changed with the rotational speed change amount per rotation as a predetermined amount. It is preferable that the rotational speed is gradually brought close to the target rotational speed by executing step 630.

  If it is determined in step 620 that the rotational speed of the electric compressor 2 has reached the target rotational speed, the rotational speed of the electric compressor 2 is fixed (step 640). When step 640 is executed, the electric compressor 2 is driven at the target rotational speed without using up the individual allowable power consumption, and there is an unused surplus in the individual allowable power consumption. Therefore, the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2 are transferred so that the surplus of the individual allowable power consumption of the electric compressor 2 is transferred to the individual allowable power consumption of the electric compressor 1. Are recalculated (step 440). Then, the process returns to step 430 shown in FIG. 2 to reset the individual allowable power consumption of the electric compressor 1 and the individual allowable power consumption of the electric compressor 2.

  If it is determined in step 610 that the actual power consumption of the electric compressor 2 has reached the individual allowable power consumption, the process proceeds to step 650, and whether or not the rotational speed of the electric compressor 2 has reached the target rotational speed. Judge. If it is determined in step 650 that the rotational speed of the electric compressor 2 has reached the target rotational speed, the rotational speed of the electric compressor 2 is fixed (step 660). After step 660 is executed, the process returns to step 400 in FIG. However, as for the return to step 400, any one of step 540, step 560, and step 570 for fixing the rotational speed of the electric compressor 1 in the control of the electric compressor 1 described above is executed in accordance with the execution of step 660. Is done when.

  If it is determined in step 650 that the rotational speed of the electric compressor 2 has not reached the target rotational speed, the individual allowable power consumption has been used up, so the rotational speed of the electric compressor 2 is fixed (step 670). ). After step 670 is executed, the process returns to step 600. When returning to step 600, if the individual allowable power consumption of the electric compressor 2 is reset by the above-mentioned surplus of the individual allowable power consumption of the electric compressor 1, the electric compression is performed by the control after step 610. The rotation speed of the machine 2 may be changed.

  In the example described above, in step 420, 55% of the allowable electric power consumption of both electric compressors is allocated as the individual allowable power consumption of the electric compressor 1, and 45% is allocated as the individual allowable power consumption of the electric compressor 2, and in step 430, each is allocated. It was set as individual allowable power consumption. Here, for example, when the rotational speed of the electric compressor 2 reaches the target rotational speed when 30% of the allowable power consumption of both the electric compressors is consumed, the allowable power consumption of the electric compressor 2 is surplus. Become. The surplus power is transferred to the individual allowable power consumption of the electric compressor 1 in step 440 and reset in step 430, and 70% of the allowable electric power consumption of both electric compressors is set as the individual allowable power consumption of the electric compressor 1. be able to.

  In the control of both electric compressors 1 and 2 that are controlled in parallel regardless of the flow illustrated in FIGS. 2 and 3, if step 540 and step 640 are performed simultaneously, step 400 is performed. Return to Also, when step 570 and step 670 are executed simultaneously, the process returns to step 400.

  Moreover, the control unit 5 performs control at the time of starting of an electric compressor as shown in FIG. The control example shown in FIG. 4 is control when starting the electric compressor 1 from a state where the electric compressor 1 is stopped and the electric compressor 2 is driven.

  First, the control unit 5 inputs power information that can be supplied from the battery 230 and the generator 220 to the refrigerator 100 based on the input information from the HVECU 240 (step 700). That is, in step 700, the total allowable power consumption of the refrigerator 100 is input as in step 400 of FIG. If the total allowable power consumption of the refrigerator 100 is input in step 700, next, the allowable power consumption usable by both the electric compressors 1 and 2 is calculated in the same manner as in step 410 of FIG. 2 (step 710).

  When step 710 is executed, the electric compressor 1 is stopped and the electric compressor 2 is driven (step 720), and it is monitored whether or not the start condition of the electric compressor 1 is satisfied (step 720). 730). The starting condition of the electric compressor 1 referred to here is, for example, a case where a switch for operating the refrigeration cycle apparatus 11 is operated and an operation command signal is input to the control unit 5. In addition, for example, when the temperature of the inside of the freezer 20 is adjusted, the electric compressor 1 is turned on and off, and the electric compressor 1 shifts from an off state (so-called thermo-off state) to an on state.

  If the starting condition of the electric compressor 1 is satisfied in step 730, step 740 is executed in the same manner as step 420 in FIG. That is, in step 740, the allowable power consumption of both the electric compressors 1 and 2 calculated in step 710 is distributed based on the COP ratio of the refrigeration cycle apparatuses 11 and 12, and the individual allowable power consumption and the electric compression of the electric compressor 1 are allocated. The individual allowable power consumption of the machine 2 is calculated and set.

  When step 740 is executed, the actual power consumption actually used by the electric compressor 2 at that time is acquired (step 750). Then, it is determined whether or not the actual power consumption acquired in step 750 is equal to or greater than the individual allowable power consumption of the electric compressor 2 set in step 740 (step 760). If it is determined in step 760 that the actual power consumption of the electric compressor 2 is greater than or equal to the individual allowable power consumption, the rotational speed of the electric compressor 2 is decreased (step 770), and the process returns to step 760. In step 770, it is preferable that the rotational speed is gradually changed by setting the rotational speed reduction amount per one time as a predetermined amount, and the rotational speed is gradually decreased by executing step 770 a plurality of times.

  In the state where the electric compressor 1 is stopped and the electric compressor 2 is driven in step 720, it is not necessary to supply power to the electric compressor 1. Therefore, when the target rotational speed is relatively high, the actual power consumption of the electric compressor 2 may exceed the individual allowable power consumption of the electric compressor 2 calculated and set in step 740. In other words, since there is no power consumption of the electric compressor 1, the individual allowable power consumption of the electric compressor 1 calculated based on the COP ratio can be all transferred to the electric compressor 2. By executing Step 760 and Step 770, the state where the actual power consumption of the electric compressor 2 exceeds the individual allowable power consumption of the electric compressor 2 calculated and set in Step 740 is eliminated.

  If it is determined in step 760 that the actual power consumption of the electric compressor 2 is less than the individual allowable power consumption, the process proceeds to step 780 and the electric compressor 1 is activated. When step 780 is executed, the process proceeds to the compressor drive control shown in FIGS. After securing the individual allowable power consumption of the electric compressor 1 in step 760, the electric compressor 1 is started in step 780, so that the electric compressor 1 can be started up stably.

  According to the above-described configuration and operation, each of the electric compressors 1 and 2 driven by the electric power supplied from the power supply power is provided, and the refrigerant discharged from each of the electric compressors 1 and 2 is circulated and stored. Refrigeration cycle apparatuses 11 and 12 for adjusting the temperature of the internal air 21 and 31 are provided. And the control unit 5 which performs drive control of the electric compressors 1 and 2 distributes the suppliable power that can be supplied from the power supply to the electric compressors 1 and 2 as the individual allowable power consumption of the electric compressors 1 and 2. The electric compressors 1 and 2 are driven and controlled within the range of the individual allowable power consumption. Based on the COP ratio of the refrigeration cycle apparatuses 11 and 12, the control unit 5 allows the electric compressors 1 and 2 to have an allowable consumption so that the electric power consumption of the electric compressor of the refrigeration cycle apparatus having a larger COP increases. Allocate power.

  According to this, the electric power that can be supplied from the power supply to the electric compressors 1 and 2 is determined based on the COP ratio of the refrigeration cycle apparatuses 11 and 12 with respect to the electric power consumption of each of the electric compressors 1 and 2. Power consumption). In that case, the individual permissible power consumption of the electric compressor can be increased as the refrigeration cycle apparatus having a larger COP. That is, the power that can be supplied can be preferentially distributed to the electric compressor of the refrigeration cycle apparatus having high operating efficiency. Accordingly, the overall efficiency of the plurality of refrigeration cycle apparatuses 11 and 12 can be improved. That is, the plurality of refrigeration cycle apparatuses 11 and 12 can be efficiently operated. Thereby, the efficiency of the refrigerator 100 whole can be improved.

  If the supply power from the power supply is distributed to the plurality of electric compressors in succession, the power supply to some of the electric compressors may be insufficient, and a state where the rotation speed is not stable may be formed. According to this embodiment, it is possible to prevent such a problem. According to this embodiment, both the electric compressors 1 and 2 can be driven stably.

  In addition, when one of the electric compressors 1 and 2 can be driven at the target rotational speed without using up the individual allowable power consumption, the control unit 5 determines the individual allowable power consumption of the one electric compressor. Is redistributed to the other electric compressor.

  According to this, the individual permissible power consumption that is surplus in one electric compressor can be effectively used by being assigned to the other electric compressor. Therefore, the plurality of refrigeration cycle apparatuses 11 and 12 can be operated efficiently and stably.

  In the present embodiment, the power supply is the battery 230 and the generator 220, and the suppliable power is easily limited. However, according to the present embodiment, even if the power that can be supplied is limited, the plurality of refrigeration cycle apparatuses 11 and 12 can be operated efficiently and stably.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the above embodiment, the electric power that can be supplied to both the electric compressors 1 and 2 is distributed according to the ratio of the COP of the refrigeration cycle apparatuses 11 and 12 to be the individual allowable power consumption of the electric compressors 1 and 2, but the COP ratio If it distributes based on this, it will not be limited to this.

  For example, a part of electric power that can be supplied to both electric compressors 1 and 2 is equally distributed to both electric compressors 1 and 2, and the remaining electric power that can be supplied to both electric compressors 1 and 2 is refrigerating cycle apparatus 11 and 12. The electric power consumption of each of the electric compressors 1 and 2 may be distributed according to the COP ratio.

  Further, for example, the individual allowable power consumption of each electric compressor may be calculated by multiplying or adding a physical quantity based on environmental conditions or the like to the COP ratio of the refrigeration cycle apparatus. As a physical quantity based on environmental conditions and the like, there is a temperature difference between the set temperature inside the warehouse and the outside temperature.

  That is, the control unit 5 determines that the electric compressor of the refrigeration cycle apparatus having a large temperature difference is allowed based on not only the COP ratio but also the temperature difference between the target temperature control temperature of the internal air 21 and 31 and the outside air temperature. The allowable power consumption may be distributed so that the power becomes large.

  According to this, electric power that can be supplied from the power supply can be distributed as allowable power consumption to a plurality of electric compressors based also on the temperature difference between the target temperature adjustment temperature of the temperature adjustment object and the outside air temperature. it can. In that case, the allowable power consumption of the electric compressor can be increased as the refrigeration cycle apparatus has a larger temperature difference. Therefore, the power that can be supplied can be preferentially distributed to the electric compressor of the refrigeration cycle apparatus that needs to greatly change the temperature of the temperature control object. Thereby, a plurality of refrigeration cycle devices can be operated more efficiently.

  Moreover, although the said embodiment demonstrated distribution of the allowable power consumption to the two electric compressors 1 and 2 provided in the two refrigeration cycle apparatuses 11 and 12, respectively, the refrigeration cycle apparatus having the electric compressors respectively There may be more than two.

  Even if there are three or more refrigeration cycle apparatuses, if some of the electric compressors do not use up the individual allowable power consumption, surplus power can be transferred to the remaining electric compressors. That is, the control means, when a part of the plurality of electric compressors can be driven at the target rotational speed without using up the allowable power consumption, the allowable power consumption of the partial electric compressor. Can be redistributed to the remaining electric compressor.

  According to this, the allowable power consumption that is surplus in some of the electric compressors can be allocated to the remaining electric compressors for effective use. Therefore, a plurality of refrigeration cycle apparatuses can be operated efficiently and stably.

  Moreover, when surplus of allowable power consumption is delivered to a plurality of electric compressors, the surplus of allowable power consumption can be distributed based on the COP ratio of the refrigeration cycle apparatus on the delivery side. That is, when there are a plurality of the remaining electric compressors, the control means can redistribute the surplus of allowable power consumption to the remaining electric compressors based on the ratio of the COP.

  According to this, the allowable power consumption that is surplus in some of the electric compressors can be preferentially allocated to the electric compressors having a relatively good coefficient of performance of the refrigeration cycle apparatus among the remaining electric compressors. Therefore, a plurality of refrigeration cycle apparatuses can be operated more efficiently and stably.

  In the above embodiment, the temperature adjustment object of the refrigeration cycle apparatus 11 is the internal air 21 of the freezer 20, and the temperature adjustment object of the refrigeration cycle apparatus 12 is the internal air 31 of the refrigerator 30. It is not limited to. For example, all of the temperature control objects of the plurality of refrigeration cycle apparatuses may be freezer compartment air, or may be refrigerator internal air. Moreover, although each refrigeration cycle apparatus may temperature-control the air in the store | warehouse | chamber of each store | warehouse | chamber, a plurality of refrigeration cycle apparatuses may adjust the temperature in the store | chamber interior air of a common store | warehouse | chamber.

  Moreover, the temperature control object is not limited to air. The temperature control object may be a gas other than air. The temperature control object may be a liquid such as water stored in a tank or water tank mounted on the vehicle. Further, the temperature control object may be a solid object mounted on the vehicle.

  Moreover, in the said embodiment, although the temperature control object was temperature-controlled with the cold heat which a refrigeration cycle apparatus produces | generates, ie, the temperature was adjusted with the thermal radiation to the outside, it is not limited to this. The temperature of the temperature control object may be adjusted by the heat generated by the refrigeration cycle apparatus, that is, the temperature may be adjusted by heat absorption from the outside.

  Moreover, in the said embodiment, although the power supply was the battery 230 and the generator 220 of the hybrid system 200 mounted in the vehicle, it is not limited to this. What is necessary is just the power supply mounted in the vehicle. For example, in a system in which the engine directly drives the tire without driving assistance by driving the motor, and the energy from the tire can be regenerated by the generator and stored in the battery during braking, the battery and the generator are used as the power supply. There may be. For example, when the vehicle is an electric vehicle such as an electric vehicle, only the battery may be used as the power supply.

1, 2 Electric compressor 5 Control unit (control means)
11, 12 Refrigeration cycle apparatus 20 Freezer 21 Air in the chamber (object for temperature control)
30 Refrigerator 31 Air inside the chamber (object for temperature control)
220 Generator (power supply)
230 Battery (power supply)

Claims (4)

A plurality of electric compressors (1, 2) driven by electric power supplied from a power supply (220, 230) to discharge refrigerant;
A plurality of refrigeration cycle devices (11, 12) each having the electric compressor and circulating the refrigerant discharged from each electric compressor to adjust the temperature of the temperature control object (21, 31);
Control means (5) for performing drive control of the plurality of electric compressors,
The control means includes
The suppliable power that can be supplied from the power supply to the plurality of electric compressors is distributed as the permissible power consumption of the plurality of electric compressors, and the electric compressors within the range of the permissible power consumption Drive control,
Based on the ratio of the coefficient of performance of the plurality of refrigeration cycle apparatuses, the allowable power consumption increases as the electric compressor of the refrigeration cycle apparatus having a large coefficient of performance increases with respect to the plurality of electric compressors. A temperature control device for a vehicle characterized by allocating allowable power consumption. The control means includes
When some of the plurality of electric compressors can be driven at a target rotational speed without using up the allowable power consumption, the allowable power consumption of the some of the electric compressors is reduced. The vehicle temperature control device according to claim 1, wherein the surplus is redistributed to the remaining electric compressor. The control means includes
3. The redistribution of the surplus to the remaining electric compressor based on the ratio of the coefficient of performance when the remaining electric compressors are plural. The temperature control apparatus for vehicles as described. The control means includes
In addition to the ratio of the coefficient of performance, based on the temperature difference between the target temperature adjustment temperature of the temperature adjustment target object and the outside air temperature, the allowable power consumption of the electric compressor of the refrigeration cycle apparatus having a large temperature difference is higher. The temperature control device for a vehicle according to any one of claims 1 to 3, wherein the allowable power consumption is distributed so as to increase.

Images