Refrigeration cycle device

Abstract

To provide a refrigeration cycle device which includes a plurality of refrigeration cycles and enables efficient temperature adjustment of a plurality of temperature adjustment objects.SOLUTION: A refrigeration cycle device includes: a main refrigeration cycle 10; a sub refrigeration cycle 20; and a heat medium circuit 30. The main refrigeration cycle 10 has a main water refrigerant heat exchanger 12 for heating ventilating air, an indoor evaporator 15 which cools ventilating air, and a main chiller 16 which cools a heat medium. The sub refrigeration cycle 20 has a sub chiller 26 which cools the heat medium. The heat medium circuit 30 has a coolant passage 80a of a battery 80. In a single cooling mode, the refrigeration cycle device stops a sub compressor 21 of the sub refrigeration cycle 20 and causes the heat medium cooled by the main chiller 16 to flow into the coolant passage 80a. In a large single cooling mode, the refrigeration cycle device causes the heat medium cooled by the main chiller 16 and the heat medium cooled by the sub chiller 26 to flow into the coolant passage 80a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a refrigeration cycle device including a plurality of vapor compression refrigeration cycles. [Background technology]

[0002] Conventionally, a refrigeration cycle device applied to a vehicle air conditioner for an electric vehicle is disclosed in Patent Document 1. The refrigeration cycle device of Patent Document 1 includes one vapor compression refrigeration cycle and is configured to be able to adjust the temperatures of multiple temperature adjustment targets, such as the air blown into the vehicle cabin and on-board equipment (specifically, the battery) that generates heat during operation.

[0003] More specifically, the refrigeration cycle of Patent Document 1 includes two evaporators connected in parallel with respect to the refrigerant flow. One of the evaporators, an indoor evaporator, cools the blown air, which is a first temperature-adjustment object, and the other evaporator, a chiller, cools the cooling water (i.e., heat medium) for cooling the batteries, which are a second temperature-adjustment object. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6791052 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent electric vehicles, the amount of heat generated by batteries has increased, necessitating an improvement in the battery cooling capacity of refrigeration cycle devices. To address this issue, a secondary refrigeration cycle dedicated to battery cooling may be added to the primary refrigeration cycle, which provides cabin air conditioning and battery cooling. However, when a secondary refrigeration cycle is added, it is desirable to coordinate the primary and secondary refrigeration cycles to efficiently utilize the secondary refrigeration cycle.

[0006] In view of the above, an object of the present invention is to provide a refrigeration cycle device that includes a plurality of refrigeration cycles and is capable of efficiently adjusting the temperature of an object to be temperature-adjusted. [Means for solving the problem]

[0007] To achieve the above object, a refrigeration cycle device according to claim 1 includes a main refrigeration cycle (10), a sub-refrigeration cycle (20), and a heat medium circuit (30). The main refrigeration cycle adjusts the temperature of a first temperature-adjustment object and the temperature of a heat medium. The sub-refrigeration cycle adjusts the temperature of the heat medium. The heat medium circuit circulates the heat medium.

[0008] The main refrigeration cycle includes a main compression section (11), a heating section (12, 38), a branch section (13a), a first main pressure reduction section (14a), a first main evaporation section (15), a second main pressure reduction section (14b), and a second main evaporation section (16). The main compression section compresses and discharges a main refrigerant. The heating section heats a first temperature-adjustment object using the main refrigerant discharged from the main compression section as a heat source. The branch section branches the flow of the main refrigerant flowing out from the heating section. The first main pressure reduction section reduces the pressure of one of the main refrigerants branched at the branch section. The first main evaporation section evaporates the main refrigerant reduced in pressure at the first main pressure reduction section by heat exchange with the first temperature-adjustment object. The second main pressure reduction section reduces the pressure of the other main refrigerant branched at the branch section. The second main evaporation section evaporates the main refrigerant reduced in pressure at the second main pressure reduction section by heat exchange with a heat medium.

[0009] The sub-refrigeration cycle includes a sub-compression section (21), a sub-heat dissipation section (22), a sub-pressure reduction section (24), and a sub-evaporation section (26). The sub-compression section compresses and discharges a sub-refrigerant. The sub-heat dissipation section dissipates heat from the sub-refrigerant discharged from the sub-compression section. The sub-pressure reduction section reduces the pressure of the sub-refrigerant flowing out from the sub-heat dissipation section. The sub-evaporation section evaporates the sub-refrigerant reduced in pressure by the sub-pressure reduction section through heat exchange with a heat medium.

[0010] The heat medium circuit has a low-temperature side heat medium circuit (301). The low-temperature side heat medium circuit includes a heat medium passage (16b) of the second main evaporation section, a heat medium passage (22b) of the sub-evaporation section, and a second temperature adjustment heat exchange section (80a). The second temperature adjustment heat exchange section exchanges heat between the heat medium and a second object to be temperature-adjusted (80).

[0011] The operation modes for cooling the second temperature adjustment object include a second object normal cooling mode and a second object large cooling mode.

[0012] In the main refrigeration cycle of the second object normal cooling mode, the main compression unit is stopped. In the secondary refrigeration cycle of the second object normal cooling mode, the secondary compression unit is operated. In the heat transfer medium circuit of the second object normal cooling mode, the heat transfer medium cooled in the secondary evaporation unit is caused to flow into the second temperature adjustment heat exchange unit.

[0013] In the main refrigeration cycle of the second large object cooling mode, the main compression unit is operated and the main refrigerant is caused to flow into the second main evaporation unit. In the secondary refrigeration cycle of the second large object cooling mode, the secondary compression unit is operated. In the heat transfer medium circuit of the second large object cooling mode, the heat transfer medium cooled in the second main evaporation unit and the heat transfer medium cooled in the secondary evaporation unit are caused to flow into the second temperature adjustment heat exchange unit.

[0014] According to this, since the main refrigeration cycle (10) is provided, it is possible to adjust the temperatures of both the first temperature-adjustable object and the heat medium. Since the sub-refrigeration cycle (20) is provided, it is possible to adjust the temperature of the heat medium. Since the heat medium circuit (30) is provided, it is possible to adjust the temperature of the second temperature-adjustable object (80) by the heat medium.

[0015] Furthermore, in the second object normal cooling mode, the sub-compression section (21) is operated and the main compression section (11) is stopped, so that the second temperature adjustment object (80) can be cooled by the heat medium cooled in the sub-evaporation section (26).

[0016] In addition, in the second object large cooling mode, the main compression section (11) is operated and the sub-compression section (21) is operated, so that the second temperature adjustment object (80) can be cooled by the heat medium cooled in the second main evaporation section (16) and the heat medium cooled in the sub-evaporation section (26).

[0017] Therefore, by switching between the second object normal cooling mode and the second object large cooling mode depending on the cooling capacity required to appropriately cool the second temperature-adjustment object (80), it is possible to efficiently cool the second temperature-adjustment object (80). That is, in the refrigeration cycle device according to the first aspect, it is possible to efficiently adjust the temperature of the temperature-adjustment object by utilizing the temperature adjustment capacity exhibited by the plurality of refrigeration cycles.

[0018] The symbols in parentheses for each means described in this section and in the claims are examples showing the correspondence with the specific means described in the embodiments to be described later. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a single cooling mode of the refrigeration cycle device of the first embodiment. FIG. [Figure 2] 1 is a schematic configuration diagram of an indoor air conditioning unit according to a first embodiment. [Figure 3] 2 is a block diagram showing an electric control unit of the vehicle air conditioner of the first embodiment. FIG. [Figure 4] 5 is a flowchart showing a control flow in a cooling mode in the first embodiment. [Figure 5] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large single cooling mode of the refrigeration cycle device of the first embodiment. FIG. [Figure 6] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a single heating mode of the refrigeration cycle device of the first embodiment. FIG. [Figure 7] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a high-power single heating mode of the refrigeration cycle device of the first embodiment. FIG. [Figure 8] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a single cooling mode and a normal dehumidifying and heating mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 9] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large-capacity single cooling mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 10] FIG. 4 is a Mollier diagram for comparing the change in state of the refrigerant in the main refrigeration cycle in the first embodiment in the single cooling mode and the large single cooling mode. [Figure 11] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a normal cooling / air-cooling mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 12] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a high-cooling cooling mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 13] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large dehumidification heating mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 14] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a normal warm-up mode of a refrigeration cycle device of a first embodiment. [Figure 15] 1 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large warm-up mode of a refrigeration cycle device of a first embodiment. FIG. [Figure 16] FIG. 10 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large-capacity single cooling mode of a refrigeration cycle device of a second embodiment. [Figure 17] FIG. 6 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a normal warm-up mode of a refrigeration cycle device of a second embodiment. [Figure 18] FIG. 6 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large warm-up mode of a refrigeration cycle device of a second embodiment. [Figure 19] FIG. 10 is a schematic overall configuration diagram showing the flow of the refrigerant and the heat medium in a high-power single heating mode of the refrigeration cycle device of the third embodiment. [Figure 20]FIG. 10 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large dehumidification heating mode of a refrigeration cycle device of a third embodiment. [Figure 21] FIG. 10 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a normal warm-up mode of a refrigeration cycle device of a third embodiment. [Figure 22] FIG. 10 is a schematic overall configuration diagram showing the flow of a refrigerant and a heat medium in a large warm-up mode of a refrigeration cycle device of a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, several embodiments for carrying out the present invention will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in the preceding embodiment will be assigned the same reference numerals, and duplicate explanations may be omitted. In each embodiment, when only a part of the configuration is described, other previously described embodiments may be applied to the other parts of the configuration. In addition to combinations of parts that are specifically specified as being combinable in each embodiment, it is also possible to partially combine embodiments even if not specified, as long as there is no particular problem with the combination.

[0021] (First embodiment) A first embodiment of a refrigeration cycle device according to the present invention will be described with reference to Figures 1 to 15. In this embodiment, the refrigeration cycle device according to the present invention is applied to a vehicle air conditioner 1 mounted on an electric vehicle.

[0022] The vehicle air conditioner 1 of this embodiment conditions the air inside the vehicle cabin, which is the space to be air-conditioned, and also regulates the temperature of on-board equipment that generates heat during operation. For this reason, the vehicle air conditioner 1 can be called an air conditioner with an on-board equipment temperature regulation function, or an on-board equipment temperature regulation device with an air conditioning function. In the vehicle air conditioner 1, the air blown into the vehicle cabin is the first temperature regulation object. The on-board equipment is the second temperature regulation object.

[0023] Specifically, the vehicle air conditioner 1 adjusts the temperature of a battery 80 as an in-vehicle device. The battery 80 is a secondary battery that stores power to be supplied to a plurality of electrically operated in-vehicle devices. The battery 80 is an assembled battery formed by electrically connecting a plurality of stacked battery cells in series or parallel. The battery cells in this embodiment are lithium-ion batteries.

[0024] The battery 80 generates heat during operation (i.e., during charging and discharging). The output of the battery 80 is likely to decrease at low temperatures, and deterioration is likely to progress at high temperatures. For this reason, the temperature of the battery 80 needs to be maintained within an appropriate temperature range (in this embodiment, 15°C or higher and 55°C or lower). Therefore, in the electric vehicle of this embodiment, the temperature of the battery 80 is adjusted using the vehicle air conditioner 1.

[0025] The vehicle air conditioner 1 of this embodiment includes a main refrigeration cycle 10, a sub-refrigeration cycle 20, a heat medium circuit 30, an interior air conditioning unit 60, a control device 70, and the like.

[0026] First, the main refrigeration cycle 10 will be described using the overall configuration diagram in Fig. 1. The main refrigeration cycle 10 is a vapor compression refrigeration cycle that adjusts the temperature of the air blown into the vehicle cabin and the temperature of the heat medium circulating through the heat medium circuit 30. The main refrigeration cycle 10 is configured to be able to switch the refrigerant circuit according to various operation modes described below in order to air-condition the vehicle cabin and adjust the temperature of on-board equipment.

[0027] The main refrigeration cycle 10 uses R1234yf as a refrigerant. The main refrigeration cycle 10 constitutes a subcritical refrigeration cycle in which the pressure of the high-pressure side refrigerant does not exceed the critical pressure of the refrigerant. Refrigeration oil for lubricating the main compressor 11 is mixed into the refrigerant. The refrigeration oil is PAG oil (i.e., polyalkylene glycol oil) that is compatible with liquid-phase refrigerants. A portion of the refrigeration oil circulates through the refrigerant circuit together with the refrigerant. In the following description, the refrigerant circulating through the main refrigeration cycle 10 will be referred to as the main refrigerant.

[0028] The main compressor 11 is a main compression section in the main refrigeration cycle 10 that draws in, compresses, and discharges a main refrigerant. The main compressor 11 is an electric compressor that uses an electric motor to rotate a fixed-displacement compression mechanism with a fixed discharge capacity. The rotation speed (i.e., refrigerant discharge capacity) of the main compressor 11 is controlled by a control signal output from a control device 70, which will be described later.

[0029] The discharge port of the main compressor 11 is connected to the inlet side of a refrigerant passage 12a of the main water-refrigerant heat exchanger 12. The main water-refrigerant heat exchanger 12 has a refrigerant passage 12a through which the main refrigerant discharged from the main compressor 11 flows, and a heat medium passage 12b through which the heat medium circulating in the heat medium circuit 30 flows.

[0030] The main water-refrigerant heat exchanger 12 is a main heat medium-refrigerant heat exchanger that exchanges heat between the main refrigerant flowing through the refrigerant passage 12a and the heat medium flowing through the heat medium passage 12b. The main water-refrigerant heat exchanger 12 is a main heat dissipation section that dissipates heat from the main refrigerant to the heat medium. A receiver (not shown) is disposed at the outlet of the refrigerant passage 12a of the main water-refrigerant heat exchanger 12.

[0031] The receiver is a high-pressure side gas-liquid separator that separates the main refrigerant from the refrigerant passage 12a of the main water-refrigerant heat exchanger 12. The receiver allows a portion of the separated liquid-phase refrigerant to flow downstream and stores the remaining liquid-phase refrigerant as surplus refrigerant for the cycle.

[0032] The inlet side of a first main three-way joint 13a is connected to the outlet of the receiver section of the main water-refrigerant heat exchanger 12. The first main three-way joint 13a is a three-way joint having three inlet and outlet ports that communicate with each other. The first main three-way joint 13a can be a joint formed by joining multiple pipes or a joint formed by providing multiple refrigerant passages in a metal block or a resin block.

[0033] This type of three-way joint functions as a branching section where the refrigerant flow branches when one of the three inlet / outlet ports is used as an inlet and the other two are used as outlet ports. Also, when two of the three inlet / outlet ports are used as inlet ports and the other is used as an outlet port, the three-way joint functions as a merging section where the refrigerant flow merges.

[0034] Here, the main refrigeration cycle 10 includes a second main three-way joint 13b. The sub-refrigeration cycle 20 and the heat medium circuit 30 also include a plurality of three-way joints. The basic configurations of these three-way joints are the same as those of the first main three-way joint 13a. The basic configurations of various three-way joints described in the embodiments below are also the same as those of the first main three-way joint 13a.

[0035] The first main three-way joint 13a is a branching section that branches the flow of the main refrigerant flowing out from the main water-refrigerant heat exchanger 12. One outlet of the first main three-way joint 13a is connected to the inlet side of the cooling expansion valve 14a. The other outlet of the first main three-way joint 13a is connected to the inlet side of the cooling expansion valve 14b.

[0036] The cooling expansion valve 14a is a first main pressure reducing unit that reduces the pressure of the main refrigerant flowing out from one outlet of the first main three-way joint 13a, i.e., one of the main refrigerants branched at the first main three-way joint 13a. Furthermore, the cooling expansion valve 14a is a first main flow rate adjusting unit that adjusts the flow rate (in this embodiment, the mass flow rate) of the main refrigerant flowing into the indoor evaporator 15.

[0037] The cooling expansion valve 14a is an electric variable throttle mechanism having a valve body that changes the throttle opening and an electric actuator (specifically, a stepping motor or a brushless DC motor) that acts as a drive unit that displaces the valve body. The operation of the cooling expansion valve 14a is controlled by control pulses output from the control device 70.

[0038] The cooling expansion valve 14a has a full-open function that functions as a simple refrigerant passage without exerting any pressure reduction effect by fully opening the throttle opening of the valve body, and also has a full-close function that closes the refrigerant passage by fully closing the throttle opening of the valve body.

[0039] The cooling expansion valve 14a can switch the refrigerant circuit of the main refrigeration cycle by performing the full-closing function. Therefore, the cooling expansion valve 14a serves as a refrigerant circuit switching unit that switches the refrigerant circuit. Of course, the cooling expansion valve 14a may be formed by combining a variable throttle mechanism that does not have the full-closing function with an on-off valve that opens and closes the throttle passage. In this case, the on-off valve serves as the refrigerant circuit switching unit.

[0040] Here, the main refrigeration cycle 10 is equipped with a cooling expansion valve 14b. Moreover, the sub-refrigeration cycle 20 is equipped with a sub-expansion valve 24. The basic configuration of these expansion valves is the same as that of the cooling expansion valve 14b. Therefore, the cooling expansion valve 14b serves as a refrigerant circuit switching unit for the main refrigeration cycle 10. The sub-expansion valve 24 serves as a refrigerant circuit switching unit for the sub-refrigeration cycle 20.

[0041] The outlet of the cooling expansion valve 14a is connected to the refrigerant inlet side of the indoor evaporator 15. The indoor evaporator 15 is disposed in an air passage formed in an indoor air conditioning unit 60, which will be described later.

[0042] The interior evaporator 15 exchanges heat between the main refrigerant decompressed by the cooling expansion valve 14a and the ventilation air blown into the vehicle interior from the interior blower 62. The interior evaporator 15 is a first main evaporation section that cools the ventilation air by evaporating the main refrigerant decompressed by the cooling expansion valve 14a to exert a heat absorption effect.

[0043] Cooling expansion valve 14b is a second main pressure reducing unit that reduces the pressure of the main refrigerant flowing out from the other outlet of first main three-way joint 13a, i.e., the other main refrigerant branched at first main three-way joint 13a. Furthermore, cooling expansion valve 14b is a second main flow rate adjusting unit that adjusts the flow rate of the main refrigerant flowing into main chiller 16.

[0044] The outlet of the cooling expansion valve 14b is connected to the inlet side of a refrigerant passage 16a of the main chiller 16. The main chiller 16 has a refrigerant passage 16a through which the main refrigerant flowing out from the cooling expansion valve 14b flows, and a heat medium passage 16b through which the heat medium circulating in the heat medium circuit 30 flows.

[0045] The main chiller 16 exchanges heat between the main refrigerant flowing through the refrigerant passage 16a and the heat medium flowing through the heat medium passage 16b. The main chiller 16 is a second main evaporation section that cools the heat medium by evaporating the main refrigerant decompressed by the cooling expansion valve 14b and exerting a heat absorption effect.

[0046] One inlet side of the second main three-way joint 13b is connected to the refrigerant outlet of the indoor evaporator 15. The other inlet side of the second main three-way joint 13b is connected to the outlet of the refrigerant passage 16a of the main chiller 16. The suction port side of the main compressor 11 is connected to the outlet of the second main three-way joint 13b. The second main three-way joint 13b is a junction where the flow of the main refrigerant flowing out of the indoor evaporator 15 and the flow of the main refrigerant flowing out of the refrigerant passage 16a of the main chiller 16 are joined together.

[0047] Next, a description will be given of the secondary refrigeration cycle 20. The secondary refrigeration cycle 20 is a vapor compression refrigeration cycle that adjusts the temperature of the heat medium circulating through the heat medium circuit 30. The secondary refrigeration cycle 20 is configured to be able to switch the refrigerant circuit according to various operation modes described later in order to air-condition the vehicle interior and adjust the temperature of on-board equipment.

[0048] The sub-refrigeration cycle 20 employs the same type of refrigerant as that used in the main refrigeration cycle 10. The refrigerant circulating through the sub-refrigeration cycle 20 also contains the same type of refrigeration oil as that used in the main refrigeration cycle 10, in order to lubricate the sub-compressor 21. In the following description, the refrigerant circulating through the sub-refrigeration cycle 20 will be referred to as a sub-refrigerant.

[0049] The sub-compressor 21 is a sub-compression section that draws in, compresses, and discharges a sub-refrigerant in the sub-refrigeration cycle 20. The basic configuration of the sub-compressor 21 is similar to that of the main compressor 11.

[0050] The discharge port of the sub-compressor 21 is connected to the inlet side of a refrigerant passage 22a of the sub-water-refrigerant heat exchanger 22. The sub-water-refrigerant heat exchanger 22 has a refrigerant passage 22a through which the sub-refrigerant discharged from the sub-compressor 21 flows, and a heat medium passage 22b through which the heat medium circulating in the heat medium circuit 30 flows.

[0051] The secondary water-refrigerant heat exchanger 22 is a secondary heat medium refrigerant heat exchanger that exchanges heat between the secondary refrigerant flowing through the refrigerant passage 22a and the heat medium flowing through the heat medium passage 22b. The secondary water-refrigerant heat exchanger 22 is a secondary heat dissipation section that dissipates heat from the secondary refrigerant to the heat medium. Similar to the main water-refrigerant heat exchanger 12, a receiver (not shown) is disposed at the outlet of the refrigerant passage 22a of the secondary water-refrigerant heat exchanger 22.

[0052] The inlet side of a first sub-three-way joint 23a is connected to the outlet of the receiver of the sub-water-refrigerant heat exchanger 22. One outlet of the first sub-three-way joint 23a is connected to the inlet of a hot gas passage 27. One inlet of a second sub-three-way joint 23b is connected to the outlet of the hot gas passage 27. The inlet side of a sub-expansion valve 24 is connected to the other outlet of the first sub-three-way joint 23a.

[0053] The sub-expansion valve 24 is a sub-pressure reducing section that reduces the pressure of the sub-refrigerant flowing out from the sub-water-refrigerant heat exchanger 22. Furthermore, the sub-expansion valve 24 is a sub-flow rate adjusting section that adjusts the flow rate of the sub-refrigerant flowing into the sub-chiller 26.

[0054] The outlet of the sub-expansion valve 24 is connected to the inlet side of a refrigerant passage 26a of the sub-chiller 26. The sub-chiller 26 has a refrigerant passage 26a through which the sub-refrigerant flowing out from the sub-expansion valve 24 flows, and a heat medium passage 26b through which the heat medium circulating in the heat medium circuit 30 flows.

[0055] The sub-chiller 26 exchanges heat between the sub-refrigerant flowing through the refrigerant passage 26a and the heat medium flowing through the heat medium passage 26b. The sub-chiller 26 is a sub-evaporation section that cools the heat medium by evaporating the sub-refrigerant decompressed by the sub-expansion valve 24 to exert a heat absorption effect. The outlet of the refrigerant passage 26a of the sub-chiller 26 is connected to the other inlet side of the second sub-three-way joint 23b. The outlet of the second sub-three-way joint 23b is connected to the suction side of the sub-compressor 21.

[0056] The hot gas passage 27 is a refrigerant passage that guides the secondary refrigerant flowing out from the refrigerant passage 22a of the secondary water-refrigerant heat exchanger 22 to the suction port side of the secondary compressor 21, bypassing the secondary expansion valve 24 and the secondary chiller 26. Furthermore, the hot gas passage 27 is a hot gas decompression section that decompresses the refrigerant flowing through the hot gas passage 27.

[0057] Specifically, the hot gas passage 27 in this embodiment is formed by a capillary tube. Of course, the hot gas passage 27 may also be formed by providing a fixed throttle such as an orifice in a normal refrigerant pipe that does not exert a refrigerant pressure reducing effect.

[0058] An auxiliary on-off valve 28 is disposed in the hot gas passage 27. The auxiliary on-off valve 28 is a solenoid valve that opens and closes the hot gas passage 27. The opening and closing operation of the auxiliary on-off valve 28 is controlled by a control voltage output from the control device 70. The auxiliary on-off valve 28 can switch the refrigerant circuit by opening and closing the hot gas passage 27. Therefore, the auxiliary on-off valve 28 is a refrigerant circuit switching unit of the secondary refrigeration cycle 20.

[0059] Next, the heat medium circuit 30 will be described. The heat medium circuit 30 is a circuit for circulating a heat medium. In this embodiment, an ethylene glycol aqueous solution is used as the heat medium. The heat medium circuit 30 has a low-temperature side heat medium circuit 301 and a high-temperature side heat medium circuit 302.

[0060] The low-temperature side heat medium circuit 301 is a heat medium circuit that mainly circulates a heat medium whose temperature has been adjusted by the main chiller 16 or the sub-chiller 26. The low-temperature side heat medium circuit 301 includes the heat medium passage 16b of the main chiller 16, the heat medium passage 26b of the sub-chiller 26, the low-temperature side passage 36b of the high-low temperature heat exchanger 36, and the cooling water passage 80a of the battery 80.

[0061] The low-temperature side heat medium circuit 301 has a low-temperature side pump 311. The low-temperature side pump 311 is a low-temperature side heat medium pumping unit that sucks in and pumps out the heat medium that has flowed out from the heat medium passage 26b of the sub-chiller 26. The low-temperature side pump 311 is an electric water pump whose rotation speed (i.e., pumping capacity) is controlled by a control voltage output from the control device 70.

[0062] Here, the heat medium circuit 30 is provided with a plurality of electric water pumps in addition to the low-temperature side pump 311. The basic configuration of these electric water pumps is similar to that of the low-temperature side pump 311.

[0063] The inlet side of a first low-temperature side three-way valve 351a is connected to the discharge port of the low-temperature side pump 311. The first low-temperature side three-way valve 351a is an electric three-way flow control valve that has one inlet and two outlets and can continuously adjust the passage area ratio of the two outlets. The operation of the first low-temperature side three-way valve 351a is controlled by a control signal output from the control device 70.

[0064] An inlet of a heat medium bypass passage 371 is connected to one outlet of the first low-temperature side three-way valve 351a. An inlet of a second heat medium three-way joint 33b is connected to an outlet of the heat medium bypass passage 371. An inlet of a second low-temperature side three-way valve 351b is connected to the other outlet of the first low-temperature side three-way valve 351a.

[0065] The first low-temperature side three-way valve 351a allows the entire flow rate of the heat medium that flows in from the inlet to flow out either to the heat medium bypass passage 371 or to the second low-temperature side three-way valve 351b. This allows the first low-temperature side three-way valve 351a to switch the circuit configuration of the heat medium circuit 30. Therefore, the three-way flow adjustment valve serves as a heat medium circuit switching unit that switches the circuit configuration of the heat medium circuit 30.

[0066] Here, in addition to the first low-temperature side three-way valve 351a, the heat medium circuit 30 is also provided with a plurality of three-way flow rate adjustment valves. The basic configuration of these three-way flow rate adjustment valves is the same as that of the first low-temperature side three-way valve 351a.

[0067] One outlet of the second low-temperature side three-way valve 351b is connected to the inlet side of the coolant passage 80a of the battery 80. The other outlet of the second low-temperature side three-way valve 351b is connected to the heat medium inlet side of the low-temperature side outside air heat exchanger 321.

[0068] The coolant passage 80a of the battery 80 is a heat medium passage for circulating the heat medium that has flowed out from the second low-temperature side three-way valve 351b, thereby adjusting the temperature of the battery 80. Therefore, the coolant passage 80a is a second temperature adjustment heat exchanger that cools the battery 80 by exchanging heat between the heat medium flowing through the heat medium flow path and the battery cells.

[0069] The coolant passage 80a of the battery 80 is formed inside a battery case that houses multiple stacked battery cells. The coolant passage 80a is configured by connecting multiple passages in parallel inside the battery case. This allows the coolant passage 80a to cool all battery cells evenly. One inlet side of the first heat medium three-way joint 33a is connected to the outlet of the coolant passage 80a of the battery 80.

[0070] The low-temperature side outside air heat exchanger 321 is a low-temperature side outside air heat exchange unit that exchanges heat between the heat medium flowing out from the second low-temperature side three-way valve 351b and outside air.

[0071] The other inlet side of the first heat medium three-way joint 33a is connected to the heat medium outlet of the low-temperature side outdoor air heat exchanger 321. The other inlet side of the second heat medium three-way joint 33b is connected to the outlet of the first heat medium three-way joint 33a. The inlet side of the low-temperature side passage 36b of the high-low temperature heat exchanger 36 is connected to the outlet of the second heat medium three-way joint 33b.

[0072] The high-low temperature heat exchanger 36 has a low-temperature side passage 36b through which the heat medium circulating in the low-temperature side heat medium circuit 301 flows, and a high-temperature side passage 36a through which the heat medium circulating in the high-temperature side heat medium circuit 302 flows. The high-low temperature heat exchanger 36 is a heat transfer unit that transfers heat between the heat medium circulating in the low-temperature side heat medium circuit 301 and the heat medium circulating in the high-temperature side heat medium circuit 302 by exchanging heat between the heat medium circulating in the low-temperature side passage 36b and the heat medium circulating in the high-temperature side passage 36a.

[0073] The heat medium bypass passage 371 is a heat medium passage that guides at least a portion of the heat medium pumped from the low-temperature side pump 311 to the high-low temperature heat exchanger 36 side, bypassing the coolant passage 80a of the battery 80 and the low-temperature side outside air heat exchanger 321.

[0074] The outlet of the low-temperature side passage 36b of the high-low temperature heat exchanger 36 is connected to the inlet side of the heat medium passage 16b of the main chiller 16. The outlet of the heat medium passage 16b of the main chiller 16 is connected to the inlet side of the heat medium passage 26b of the sub-chiller 26.

[0075] The high-temperature side heat medium circuit 302 is a heat medium circuit that mainly circulates a heat medium whose temperature has been adjusted in the main water-refrigerant heat exchanger 12 or the secondary water-refrigerant heat exchanger 22. The high-temperature side heat medium circuit 302 includes the heat medium passage 12b of the main water-refrigerant heat exchanger 12, the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22, the high-temperature side passage 36a of the high-low temperature heat exchanger 36, the heater core 38, etc.

[0076] The high-temperature side heat medium circuit 302 has a main high-temperature side pump 312a and a sub-high-temperature side pump 312b. The main high-temperature side pump 312a is a main high-temperature side heat medium pumping unit that draws in and pumps out the heat medium. The sub-high-temperature side pump 312b is a sub-high-temperature side heat medium pumping unit that draws in and pumps out the heat medium. The discharge port of the main high-temperature side pump 312a is connected to the inlet side of the heat medium passage 12b of the main water-refrigerant heat exchanger 12.

[0077] An inlet side of a first high-temperature side three-way valve 352a is connected to an outlet of the heat medium passage 12b of the main water-refrigerant heat exchanger 12. An inlet side of a high-temperature side passage 36a of the high-low temperature heat exchanger 36 is connected to one outlet of the first high-temperature side three-way valve 352a. An inlet side of one of the high-temperature side passages 36a is connected to an outlet of the high-temperature side passage 36a. An inlet side of one of the fourth heat medium three-way joints 33d is connected to the outlet of the high-temperature side passage 36a. An inlet side of one of the third heat medium three-way joints 33c is connected to the other outlet of the first high-temperature side three-way valve 352a.

[0078] The outlet of the third heat medium three-way joint 33c is connected to the inlet side of the second high-temperature side three-way valve 352b. One outlet of the second high-temperature side three-way valve 352b is connected to the heat medium inlet side of the heater core 38. The other outlet of the second high-temperature side three-way valve 352b is connected to the heat medium inlet side of the high-temperature side main outside air heat exchanger 322a.

[0079] The heater core 38 is disposed in an air passage formed in the indoor air-conditioning unit 60. The heater core 38 exchanges heat between the heat medium flowing out from the second high-temperature side three-way valve 352b and the blown air that has passed through the indoor evaporator 15. The heater core 38 is a heating heat exchanger that heats the blown air by dissipating heat possessed by the heat medium to the blown air. One inlet side of the heat medium four-way joint 33x is connected to the heat medium outlet of the heater core 38.

[0080] The heat medium four-way joint 33x is a joint part having four inlet / outlet ports that communicate with each other. A joint part formed in the same manner as a three-way joint can be used as the heat medium four-way joint 33x. The heat medium four-way joint 33x may also be formed by combining two heat medium three-way joints.

[0081] An electric heater 39 is disposed in the heat medium flow path connecting one outlet of the second high-temperature side three-way valve 352b and the heat medium inlet of the heater core 38. The electric heater 39 is an auxiliary heating unit that heats the heat medium. The electric heater 39 is a PTC heater having a positive temperature coefficient thermistor. The heat generation amount of the electric heater 39 is controlled by a control voltage output from the control device 70.

[0082] The high-temperature side main outdoor air heat exchanger 322a is a high-temperature side main outdoor air heat exchange unit that exchanges heat between the heat medium flowing out from the second high-temperature side three-way valve 352b and outdoor air. The high-temperature side main outdoor air heat exchanger 322a is included in the high-temperature side outdoor air heat exchange unit. The heat medium outlet of the high-temperature side main outdoor air heat exchanger 322a is connected to the other inlet side of the fourth heat medium three-way joint 33d. The outlet of the fourth heat medium three-way joint 33d is connected to the other inlet side of the heat medium four-way joint 33x.

[0083] One outlet of the heat medium four-way joint 33x is connected to the suction port side of the main high-temperature side pump 312a, and the other outlet of the heat medium four-way joint 33x is connected to one inlet side of the fifth heat medium three-way joint 33e.

[0084] The discharge port of the secondary high temperature side pump 312b is connected to the inlet side of the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22. The outlet of the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22 is connected to the inlet side of the third high temperature side three-way valve 352c.

[0085] One outlet of the third warm-side three-way valve 352c is connected to the other inlet of the third heat medium three-way joint 33c. Therefore, the third heat medium three-way joint 33c serves as a heat medium junction that joins the heat medium flowing out of the heat medium passage 12b of the main water-refrigerant heat exchanger 12 and the heat medium flowing from the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22. The other outlet of the third warm-side three-way valve 352c is connected to the inlet of the high-temperature side secondary outside air heat exchanger 322b.

[0086] The high-temperature side auxiliary outside air heat exchanger 322b is a high-temperature side auxiliary outside air heat exchange unit that exchanges heat between the heat medium flowing out from the third high-temperature side three-way valve 352c and outside air. The high-temperature side auxiliary outside air heat exchanger 322b is included in the high-temperature side outside air heat exchange unit. The other inlet side of the fifth heat medium three-way joint 33e is connected to the heat medium outlet of the high-temperature side auxiliary outside air heat exchanger 322b. The suction port side of the auxiliary high-temperature side pump 312b is connected to the outlet side of the fifth heat medium three-way joint 33e.

[0087] As is clear from the above description, in the main water-refrigerant heat exchanger 12 of the high-temperature side heat medium circuit 302, the heat medium can be heated by exchanging heat between the main refrigerant discharged from the main compressor 11 and the heat medium. Furthermore, in the heater core 38, the blown air can be heated by exchanging heat between the heat medium heated in the main water-refrigerant heat exchanger 12 and the blown air.

[0088] Therefore, in this embodiment, a heating section is configured that heats the blown air using the main refrigerant discharged from the main compressor 11 as a heat source, including the main water-refrigerant heat exchanger 12 and the heater core 38 of the high-temperature side heat medium circuit 302.

[0089] In the high-temperature side heat medium circuit 302, the heat of the main refrigerant discharged from the main compressor 11 can be dissipated to the outside air by circulating the heat medium between the main water-refrigerant heat exchanger 12 and the high-temperature side main outside air heat exchanger 322a. Furthermore, the heat of the secondary refrigerant discharged from the secondary compressor 21 can be dissipated to the outside air by circulating the heat medium between the secondary water-refrigerant heat exchanger 22 and the high-temperature side secondary outside air heat exchanger 322b.

[0090] Next, the interior air conditioning unit 60 will be described with reference to Figure 2. The interior air conditioning unit 60 is a unit that integrates multiple components to blow out air adjusted to an appropriate temperature for air conditioning the vehicle cabin to an appropriate location within the vehicle cabin. The interior air conditioning unit 60 is disposed within the vehicle cabin. More specifically, the interior air conditioning unit 60 is disposed inside the instrument panel (i.e., the instrument panel) at the very front of the vehicle cabin.

[0091] 2, the indoor air conditioning unit 60 has an air conditioning case 61 that forms an air passage for blown air. The air passage formed in the air conditioning case 61 accommodates an indoor blower 62, an indoor evaporator 15, a heater core 38, etc. The air conditioning case 61 is made of a resin (specifically, polypropylene) that has a certain degree of elasticity and excellent strength.

[0092] An inside / outside air switching device 63 is disposed on the most upstream side of the blown air flow of the air conditioning case 61. The inside / outside air switching device 63 is an inside / outside air switching section that switches between introducing inside air (i.e., air inside the vehicle cabin) and outside air (i.e., air outside the vehicle cabin) into the air conditioning case 61. The operation of the inside / outside air switching device 63 is controlled by a control signal output from the control device 70.

[0093] An interior blower 62 is disposed downstream of the inside / outside air switching device 63 in the flow of blown air. The interior blower 62 is a blower that blows air drawn in through the inside / outside air switching device 63 toward the vehicle interior. The rotation speed (i.e., blowing capacity) of the interior blower 62 is controlled by a control voltage output from the control device 70.

[0094] The interior evaporator 15 and the heater core 38 are disposed downstream in the flow of air blown by the interior blower 62. The interior evaporator 15 is disposed upstream in the flow of air blown from the heater core 38. A cool air bypass passage 65 is formed in the air conditioning case 61, allowing the air blown after passing through the interior evaporator 15 to bypass the heater core 38.

[0095] An air mix door 64 is disposed downstream of the indoor evaporator 15 in the air conditioning case 61 in the flow of blown air, and upstream of the heater core 38 and the cool air bypass passage 65 in the flow of blown air.

[0096] The air mix door 64 adjusts the ratio of the volume of the blown air that passes through the heating air passage in which the heater core 38 is located to the volume of the blown air that passes through the cool air bypass passage 65 after passing through the indoor evaporator 15. The operation of the actuator for driving the air mix door 64 is controlled by a control signal output from the control device 70.

[0097] A mixing space 66 is disposed downstream of the heater core 38 and the cold air bypass passage 65 in the flow direction of the blown air. The mixing space 66 is a space where the blown air heated by the heater core 38 and the blown air that has passed through the cold air bypass passage 65 and has not been heated are mixed.

[0098] In the interior air conditioning unit 60, the temperature of the blown air (i.e., conditioned air) that is mixed in the mixing space 66 and blown into the vehicle interior can be adjusted by adjusting the opening degree of the air mix door 64. Therefore, the air mix door 64 is a heat exchange air volume adjustment unit that adjusts the volume of the blown air that is heat exchanged in the heater core 38.

[0099] A plurality of openings (not shown) for blowing conditioned air toward various locations in the vehicle cabin are formed at the most downstream portion of the airflow of the air-conditioning case 61. A blowout mode door (not shown) for opening and closing each of the openings is disposed in each opening. The operation of the actuator for driving the blowout mode door is controlled by a control signal output from the control device 70.

[0100] Therefore, in the interior air conditioning unit 60, by switching the opening holes that the blow-out mode door opens and closes, conditioned air that has been adjusted to an appropriate temperature can be blown out to an appropriate location in the vehicle interior.

[0101] Next, the electrical control unit of the vehicle air conditioner 1 will be described with reference to Figure 3. The control device 70 has a well-known microcomputer including a CPU, ROM, RAM, etc., and its peripheral circuits. The control device 70 performs various calculations and processes based on control programs stored in the ROM. The control device 70 then controls the operation of various control target devices connected to the output side based on the calculation and processing results.

[0102] 3, a group of control sensors is connected to the input side of the control device 70. The group of control sensors includes an inside air temperature sensor 71a, an outside air temperature sensor 71b, a solar radiation sensor 71c, a main discharge refrigerant sensor 721a, a first main evaporator-side refrigerant sensor 722a, a second main evaporator-side refrigerant sensor 723a, a sub-discharge refrigerant sensor 721b, a sub-evaporator-side refrigerant sensor 723b, a main evaporator-side heat medium temperature sensor 73a, a sub-evaporator-side heat medium temperature sensor 73b, an equipment-side heat medium temperature sensor 73c, a heating heat medium temperature sensor 73d, an air conditioning air temperature sensor 74, a battery temperature sensor 75, etc.

[0103] The inside air temperature sensor 71a is an inside air temperature detector that detects the inside air temperature (i.e., the temperature inside the vehicle cabin) Tr. The outside air temperature sensor 71b is an outside air temperature detector that detects the outside air temperature (i.e., the temperature outside the vehicle cabin) Tam. The solar radiation sensor 71c is an solar radiation amount detector that detects the amount of solar radiation As irradiating into the vehicle cabin.

[0104] The main discharge refrigerant sensor 721a is a main discharge refrigerant temperature and pressure detection unit that detects a main discharge refrigerant temperature Td1 and a main discharge refrigerant pressure Pd1, which are the temperature and pressure of the main refrigerant discharged from the main compressor 11. The first main evaporator-side refrigerant sensor 722a is a first main evaporator-side refrigerant detection unit that detects a first main evaporator-side refrigerant temperature Ts11 and a first main evaporator-side refrigerant pressure Ps11, which are the temperature and pressure of the main refrigerant on the outlet side of the indoor evaporator 15. The first main evaporator-side refrigerant sensor 722a may be configured to detect the heat exchange fin temperature of the indoor evaporator 15. The second main evaporator-side refrigerant sensor 723a is a second main evaporator-side refrigerant detection unit that detects a second main evaporator-side refrigerant temperature Ts12 and a second main evaporator-side refrigerant temperature Ps12, which are the temperature and pressure of the main refrigerant on the outlet side of the refrigerant passage 16a of the main chiller 16.

[0105] The sub-discharge refrigerant sensor 721b is a sub-discharge refrigerant temperature and pressure detection unit that detects a sub-discharge refrigerant temperature Td2 and a sub-discharge refrigerant pressure Pd2, which are the temperature and pressure of the sub-refrigerant discharged from the sub-compressor 21. The sub-evaporation section side refrigerant sensor 723b is a sub-evaporation section side refrigerant detection unit that detects a sub-evaporation section side refrigerant temperature Ts2 and a sub-main evaporation section side refrigerant temperature Ps2, which are the temperature and pressure of the sub-refrigerant on the outlet side of the refrigerant passage 26a of the sub-chiller 26.

[0106] The main evaporator-side heat medium temperature sensor 73a is a main evaporator-side heat medium temperature detector that detects a main evaporator-side heat medium temperature TWB1, which is the temperature of the heat medium at the outlet side of the heat medium passage 16b of the main chiller 16. The sub-evaporator-side heat medium temperature sensor 73b is a sub-evaporator-side heat medium temperature detector that detects a sub-evaporator-side heat medium temperature TWB2, which is the temperature of the heat medium at the outlet side of the heat medium passage 26b of the sub-chiller 26. The appliance-side heat medium temperature sensor 73c is an appliance-side heat medium temperature detector that detects an appliance-side heat medium temperature TWB, which is the temperature of the heat medium flowing out of the coolant passage 80a of the battery 80.

[0107] The heating medium temperature sensor 73d is a heating medium temperature detection unit that detects a heating medium temperature TWHC, which is the temperature of the heat medium flowing into the heater core 38. More specifically, the heating medium temperature sensor 73d in this embodiment detects the temperature of the heat medium in the heat medium flow path from the third heat medium three-way joint 33c to the heat medium inlet of the heater core 38, and is downstream of the electric heater 39 in the heat medium flow.

[0108] The air conditioning air temperature sensor 74 is an air conditioning air temperature detection unit that detects the temperature TAV of the air blown into the vehicle interior from the interior air conditioning unit 60. The battery temperature sensor 75 is a battery temperature detection unit that detects the battery temperature TB, which is the temperature of the battery 80. The battery temperature sensor 75 has multiple temperature sensors and detects the temperature at multiple locations on the battery 80. This allows the control device 70 to detect the temperature difference and temperature distribution of each battery cell that forms the battery 80. The average value of the detection values ​​of the multiple temperature sensors is used as the battery temperature TB.

[0109] 3, an operation panel 79 located near the instrument panel at the front of the vehicle interior is connected to the input side of the control device 70 via wire or wireless. Operation signals are input to the control device 70 from various operation switches provided on the operation panel 79. Specific examples of the various operation switches provided on the operation panel 79 include an auto switch, an air conditioner switch, an air volume setting switch, a temperature setting switch, etc.

[0110] The auto switch is an automatic control setting unit that sets or cancels automatic control operation of the vehicle air conditioner 1. The air conditioner switch is a cooling request unit that requests cooling of the blown air by the evaporator 18. The air volume setting switch is an air volume setting unit that manually sets the volume of the blown air that is blown into the vehicle cabin. The temperature setting switch is a temperature setting unit that sets the set temperature Tset in the vehicle cabin.

[0111] The control device 70 of this embodiment is an integrated unit that controls various control target devices connected to the output side. Therefore, the configuration (hardware and software) that controls the operation of each control target device constitutes a control unit for controlling the operation of each control target device.

[0112] For example, in the control device 70, the component that controls the refrigerant discharge capacity of the main compressor 11 constitutes a main discharge capacity control unit for controlling the refrigerant discharge capacity of the main compressor 11. Also, the component that controls the refrigerant discharge capacity of the sub-compressor 21 constitutes a sub-discharge capacity control unit for controlling the refrigerant discharge capacity of the sub-compressor 21.

[0113] Next, the operation of the vehicle air conditioner 1 of this embodiment configured as described above will be described. The vehicle air conditioner 1 of this embodiment switches between various operation modes to condition the air inside the vehicle compartment and adjust the temperature of the battery 80. The operation mode is switched by executing a control program stored in advance in the control device 70.

[0114] The control program is executed not only when the start switch (so-called ignition switch) of the vehicle system is turned on and the vehicle system is running, but also when the battery 80 is being charged from an external power source. The control program also conditions the air inside the vehicle cabin when the auto switch is turned on.

[0115] In the main routine of the control program, detection signals from the control sensors and operation signals from the operation panel 79 are read. Then, a target blow-out temperature TAO is calculated based on the read detection signals and operation signals. Furthermore, an operation mode is selected based on the detection signals, operation signals, target blow-out temperature TAO, etc., and the operation of various controlled devices is controlled according to the selected operation mode.

[0116] The target outlet temperature TAO is the target temperature of the air blown into the vehicle interior and is calculated using the following formula F1. TAO=Kset×Tset-Kr×Tr-Kam×Tam-Ks×As+C…(F1) Tset is the set temperature inside the vehicle cabin set by the temperature setting switch. Tr is the inside air temperature detected by the inside air temperature sensor 71a. Tam is the outside air temperature detected by the outside air temperature sensor 71b. As is the amount of solar radiation detected by the solar radiation sensor 71c. Kset, Kr, Kam, and Ks are control gains, and C is a correction constant.

[0117] The control program repeats control routines such as reading detection signals and operation signals, calculating the target outlet temperature TAO, selecting an operation mode, and controlling various controlled devices at each predetermined control cycle until a predetermined termination condition is met. The operation of each operation mode is described below.

[0118] (a) Cooling mode The cooling mode is an operation mode in which the battery 80 is cooled without air conditioning the interior of the vehicle.

[0119] The cooling modes include a single cooling mode and a large single cooling mode. The single cooling mode is a second object normal cooling mode that uses the cooling capacity of the secondary refrigeration cycle 20 to cool the battery 80. The large single cooling mode is a second object large cooling mode that uses the cooling capacity of the main refrigeration cycle 10 and the secondary refrigeration cycle 20 to cool the battery 80 with a cooling capacity higher than that of the single cooling mode.

[0120] The control program selects the single cooling mode or the large single cooling mode according to the control flow shown in the flowchart of Figure 4. The control flow shown in Figure 4 is a subroutine that the main routine of the control program calls at predetermined intervals to select the operation mode when the auto switch is not turned on. Each control step shown in the flowchart of Figure 4 etc. is a function realization unit possessed by the control device 70.

[0121] 4, it is determined whether or not the cooling mode needs to be executed. Specifically, in step S41, when the battery temperature TB detected by the battery temperature sensor 75 is equal to or higher than a predetermined reference cooling temperature KTBH1, it is determined that cooling of the battery 80 is necessary. On the other hand, when the battery temperature TB is lower than a predetermined reference cooling stop temperature KTBH2, it is determined that cooling of the battery 80 is not necessary.

[0122] If it is determined in step S41 that cooling of the battery 80 is necessary, the process proceeds to step S42. If it is determined in step S41 that cooling of the battery 80 is not necessary, the process returns to the main routine.

[0123] In step S42, it is determined whether the cooling capacity of the battery 80 is insufficient. Specifically, in step S42, when the device-side heat medium temperature TWB detected by the device-side heat medium temperature sensor 73c is equal to or higher than a predetermined reference device-side temperature KTWB, it is determined that the cooling capacity is insufficient. Also, when the device-side heat medium temperature TWB is lower than the reference device-side temperature KTWB, it is determined that the cooling capacity is not insufficient.

[0124] If it is determined in step S42 that the cooling capacity of the battery 80 is insufficient, the process proceeds to step S43. In step S43, the large single cooling mode is selected, and the process returns to the main routine. Also, if it is determined in step S42 that the cooling capacity of the battery 80 is not insufficient, the process proceeds to step S44. In step S44, the single cooling mode is selected, and the process returns to the main routine.

[0125] (a-1) Single cooling mode In the main refrigeration cycle 10 in the single cooling mode, the control device 70 stops the main compressor 11.

[0126] In the sub-refrigeration cycle 20 in the single cooling mode, the control device 70 operates the sub-compressor 21. Furthermore, the control device 70 places the sub-expansion valve 24 in a throttled state to exert a refrigerant decompression effect, and closes the sub-on / off valve 28.

[0127] More specifically, the control device 70 controls the refrigerant discharge capacity of the sub-compressor 21 so that the sub-evaporator-side heat medium temperature TWB2 detected by the sub-evaporator-side heat medium temperature sensor 73b approaches a target sub-evaporator-side heat medium temperature TWBO2. The target sub-evaporator-side heat medium temperature TWBO2 is determined so that the temperature of the battery 80 approaches a target battery temperature TBO. The target battery temperature TBO is set within a temperature range in which the battery 80 operates appropriately.

[0128] The control device 70 also controls the throttle opening of the sub-expansion valve 24 so that the superheat degree SH2 of the sub-refrigerant on the outlet side of the refrigerant passage 26a of the sub-chiller 26 approaches a predetermined reference superheat degree KSH2. At this time, the control device 70 detects the superheat degree SH2 based on the sub-evaporation section side refrigerant temperature Ts2 and the sub-main evaporation section side refrigerant temperature Ps2 detected by the sub-evaporation section side refrigerant sensor 723b.

[0129] In the heat medium circuit 30 in the single cooling mode, the control device 70 operates the low-temperature side pump 311 and the sub-high-temperature side pump 312b and stops the main high-temperature side pump 312a so as to exert a predetermined pumping capacity.

[0130] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a so that the entire flow of heat medium that has flowed into the interior flows out to the second low-temperature side three-way valve 351b. The control device 70 also controls the operation of the second low-temperature side three-way valve 351b so that the entire flow of heat medium that has flowed into the interior flows out to the coolant passage 80a of the battery 80. The control device 70 also controls the operation of the third high-temperature side three-way valve 352c so that the entire flow of heat medium that has flowed into the interior flows out to the high-temperature side auxiliary external air heat exchanger 322b.

[0131] Furthermore, in the indoor air conditioning unit 60 in the single cooling mode, the control device 70 stops the indoor blower 62.

[0132] Therefore, in the main refrigeration cycle 10 in the single cooling mode, the main refrigerant does not circulate, as shown in FIG.

[0133] In the sub-refrigeration cycle 20 in the sole cooling mode, the sub-refrigerant circulates as shown by the solid arrows in Fig. 1. In the sub-refrigeration cycle 20 in the sole cooling mode, a vapor compression refrigeration cycle is configured in which the sub-water-refrigerant heat exchanger 22 functions as a condenser and the sub-chiller 26 functions as an evaporator. In the sub-water-refrigerant heat exchanger 22, the sub-refrigerant releases heat to the heat medium, heating the heat medium. In the sub-chiller 26, the sub-refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0134] In the heat medium circuit 30 in the single cooling mode, the heat medium circulates as shown by the dashed arrows in Fig. 1. In the low-temperature side heat medium circuit 301, the heat medium cooled by the sub-chiller 26 is drawn into the low-temperature side pump 311. The low-temperature heat medium pumped from the low-temperature side pump 311 flows into the coolant passage 80a of the battery 80 via the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b. This cools the battery 80.

[0135] The heat medium flowing out of the battery 80 passes through the low-temperature side passage 36b of the high-low temperature heat exchanger 36 and the heat medium passage 16b of the main chiller 16, and then flows into the heat medium passage 26b of the sub-chiller 26, where it is cooled. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur. In the main chiller 16, the main refrigerant does not flow into the refrigerant passage 16a, so heat exchange between the main refrigerant and the heat medium does not occur.

[0136] In the high-temperature side heat medium circuit 302, the heat medium pumped from the auxiliary high-temperature side pump 312b flows into the heat medium passage 22b of the auxiliary water-refrigerant heat exchanger 22. The heat medium heated in the auxiliary water-refrigerant heat exchanger 22 flows into the high-temperature side auxiliary outside air heat exchanger 322b via the third high-temperature side three-way valve 352c. The heat medium that flows into the high-temperature side auxiliary outside air heat exchanger 322b dissipates heat into the outside air. The heat medium that flows out of the high-temperature side auxiliary outside air heat exchanger 322b is drawn into the auxiliary high-temperature side pump 312b.

[0137] In addition, in the interior air conditioning unit 60 in the single cooling mode, the interior blower 62 is stopped, so that no ventilation air is blown into the vehicle interior.

[0138] As described above, in the single cooling mode, the cooling capacity of the secondary refrigeration cycle 20 can be used to cool the battery 80.

[0139] (a-2) Large independent cooling mode In the main refrigeration cycle 10 in the large single cooling mode, the control device 70 operates the main compressor 11. Furthermore, the control device 70 fully closes the cooling expansion valve 14a and throttles the cooling expansion valve 14b.

[0140] More specifically, the control device 70 controls the refrigerant discharge capacity of the main compressor 11 so that the main evaporator-side heat medium temperature TWB1 detected by the main evaporator-side heat medium temperature sensor 73a approaches the target main evaporator-side heat medium temperature TWBO1. The target main evaporator-side heat medium temperature TWBO1 is determined to be higher than the target auxiliary evaporator-side heat medium temperature KTWBO2.

[0141] The control device 70 also controls the throttle opening of the cooling expansion valve 14b so that the superheat degree SH12 of the main refrigerant on the outlet side of the refrigerant passage 16a of the main chiller 16 approaches a predetermined reference superheat degree KSH12. The control device 70 detects the superheat degree SH12 based on the second main evaporator-side refrigerant temperature Ts12 and the second main evaporator-side refrigerant temperature Ps12 detected by the second main evaporator-side refrigerant sensor 723a.

[0142] In the secondary refrigeration cycle 20 in the large single cooling mode, the control device 70 controls the operation of the various components in the same manner as in the single cooling mode.

[0143] In the heat medium circuit 30 in the large single cooling mode, the control device 70 operates the low-temperature side pump 311, the main high-temperature side pump 312a, and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0144] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a, the second low-temperature side three-way valve 351b, and the third high-temperature side three-way valve 352c, as in the single cooling mode. The control device 70 also controls the operation of the first high-temperature side three-way valve 352a so that the entire flow of heat medium that has flowed into the interior flows out to the second high-temperature side three-way valve 352b side via the third heat medium three-way joint 33c. The control device 70 also controls the operation of the second high-temperature side three-way valve 352b so that the entire flow of heat medium that has flowed into the interior flows out to the high-temperature side main external air heat exchanger 322a side. Furthermore, in the indoor air conditioning unit 60 in the large single cooling mode, the control device 70 stops the indoor blower 62, similar to the single cooling mode.

[0145] Therefore, in the main refrigeration cycle 10 in the large-capacity single cooling mode, the main refrigerant circulates as shown by the solid arrows in Figure 5. In the main refrigeration cycle 10 in the large-capacity single cooling mode, a vapor compression refrigeration cycle is configured in which the main water-refrigerant heat exchanger 12 functions as a condenser and the main chiller 16 functions as an evaporator. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the main chiller 16, the main refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0146] In the secondary refrigeration cycle 20 in the large single cooling mode, the secondary refrigerant circulates in the same manner as in the single cooling mode, as shown by the solid arrows in Fig. 5. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant dissipates heat to the heat medium, heating the heat medium. In the secondary chiller 26, the secondary refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0147] In the heat medium circuit 30 in the large single cooling mode, the heat medium circulates as shown by the dashed arrows in Fig. 5. In the low-temperature side heat medium circuit 301, the heat medium circulates in the same way as in the single cooling mode. This cools the battery 80.

[0148] The heat medium flowing out of the battery 80 flows into the heat medium passage 16b of the main chiller 16 via the low-temperature side passage 36b of the high-low temperature heat exchanger 36. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur. In the main chiller 16, the heat medium is cooled and flows into the heat medium passage 26b of the sub-chiller 26. In the sub-chiller 26, the heat medium is further cooled.

[0149] In the high-temperature side heat medium circuit 302, the heat medium pumped from the main high-temperature side pump 312a flows into the heat medium passage 12b of the main water-refrigerant heat exchanger 12. The heat medium heated in the main water-refrigerant heat exchanger 12 flows into the high-temperature side main outside air heat exchanger 322a via the first high-temperature side three-way valve 352a and the second high-temperature side three-way valve 352b. The heat medium that flows into the high-temperature side main outside air heat exchanger 322a dissipates heat into the outside air. The heat medium that flows out of the high-temperature side main outside air heat exchanger 322a is drawn into the main high-temperature side pump 312a.

[0150] Furthermore, in the high-temperature side heat medium circuit 302, the heat medium pumped from the auxiliary high-temperature side pump 312b circulates in the same manner as in the single cooling mode. In the high-temperature side auxiliary outside air heat exchanger 322b, the heat medium heated in the auxiliary water-refrigerant heat exchanger 22 dissipates heat to the outside air.

[0151] In addition, in the interior air conditioning unit 60 in the large single cooling mode, the interior blower 62 is stopped, so that no ventilation air is blown into the vehicle interior.

[0152] As described above, in the large single cooling mode, it is possible to utilize the cooling capacities of both the main refrigeration cycle 10 and the sub refrigeration cycle 20. Therefore, it is possible to cool the battery 80 with a higher cooling capacity than in the single cooling mode.

[0153] (b) Heating mode The heating mode is an operation mode that heats the vehicle interior without cooling the battery 80. In the control program of this embodiment, the heating mode is often selected when the auto switch and the air conditioner switch are on and the target air outlet temperature TAO is in a high temperature range of 25°C or higher, or when the outside air temperature Tam is relatively low.

[0154] The heating modes include a single heating mode and a large single heating mode. The single heating mode is a first object normal heating mode that uses the heating capacity of the main refrigeration cycle 10 to heat the blown air and heat the vehicle cabin. The large single heating mode is a first object large heating mode that uses the heating capacity of the main refrigeration cycle 10 and the sub refrigeration cycle 20 to heat the blown air and heat the vehicle cabin with a heating capacity higher than that of the single heating mode.

[0155] The large single heating mode is selected when, during single heating mode execution, even if the air mix door 64 is displaced to a position that allows the entire volume of air blown from the indoor blower 62 to flow into the heater core 38, the blown air temperature TAV does not rise to the target blown air temperature TAO.

[0156] (b-1) Standalone heating mode In the main refrigeration cycle 10 in the single heating mode, the control device 70 operates the main compressor 11. Furthermore, the control device 70 fully closes the cooling expansion valve 14a and throttles the cooling expansion valve 14b.

[0157] More specifically, the control device 70 controls the refrigerant discharge capacity of the main compressor 11 so that the main discharge refrigerant pressure Pd1 detected by the main discharge refrigerant sensor 721a approaches the target high pressure PDO1. The target high pressure PDO1 is determined based on the target discharge temperature TAO and by referring to a control map pre-stored in the control device 70. Furthermore, the control device 70 controls the throttle opening of the cooling expansion valve 14b, similar to the large single cooling mode.

[0158] In addition, in the sub-refrigeration cycle 20 in the single heating mode, the control device 70 stops the sub-compressor 21.

[0159] In the heat medium circuit 30 in the single heating mode, the control device 70 operates the low-temperature side pump 311 and the main high-temperature side pump 312a and stops the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0160] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a so that the entire flow of the heat medium that has flowed into the interior flows out to the second low-temperature side three-way valve 351b side. The control device 70 also controls the operation of the second low-temperature side three-way valve 351b so that the entire flow of the heat medium that has flowed into the interior flows out to the low-temperature side outside air heat exchanger 321 side.

[0161] The control device 70 also controls the operation of the first warm-side three-way valve 352a so that the entire flow of heat medium that has flowed into it flows out to the second warm-side three-way valve 352b. The control device 70 also controls the operation of the second warm-side three-way valve 352b so that the heating heat medium temperature TWHC detected by the heating heat medium temperature sensor 73d approaches the reference heating temperature KTWHC. The control device 70 also operates the electric heater 39 when the heating heat medium temperature TWHC is lower than the predetermined reference heating temperature KTWHC.

[0162] The operation mode for heating the vehicle cabin is executed when the outside air temperature Tam is relatively low. Therefore, in the operation mode for heating the vehicle cabin, the control device 70 often controls the operation of the second high-temperature side three-way valve 352b so that more heat medium flows toward the heater core 38 than toward the high-temperature side main outside air heat exchanger 322a.

[0163] Furthermore, in the indoor air conditioning unit 60 in the single heating mode, the control device 70 operates the indoor blower 62 to achieve a target air blowing capacity. The target air blowing capacity is determined based on the target blowing temperature TAO and by referring to a control map pre-stored in the control device 70. Furthermore, the control device 70 changes the opening degree of the air mix door 64 so that the blowing air temperature TAV detected by the air conditioning air temperature sensor 74 approaches the target blowing temperature TAO.

[0164] Therefore, in the main refrigeration cycle 10 in the single heating mode, the main refrigerant circulates in the same way as in the large single cooling mode, as shown by the solid arrows in Figure 6. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the main chiller 16, the main refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0165] In the secondary refrigeration cycle 20 in the single heating mode, the secondary refrigerant does not circulate, as shown in FIG.

[0166] In the heat medium circuit 30 in the single heating mode, the heat medium circulates as shown by the dashed arrows in Fig. 6. In the low-temperature side heat medium circuit 301, the heat medium flowing out from the sub-chiller 26 is drawn into the low-temperature side pump 311. The heat medium pumped from the low-temperature side pump 311 flows into the low-temperature side outdoor air heat exchanger 321 via the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b.

[0167] The heat medium that flows into the low-temperature side outdoor air heat exchanger 321 absorbs heat from the outdoor air. The heat medium that flows out of the low-temperature side outdoor air heat exchanger 321 flows through the low-temperature side passage 36b of the high-low temperature heat exchanger 36 into the heat medium passage 16b of the main chiller 16 and is cooled. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur.

[0168] The heat medium cooled in the main chiller 16 is sucked into the low-temperature side pump 311 via the sub-chiller 26. In the sub-chiller 26, the sub-refrigerant does not flow into the refrigerant passage 26a, so heat exchange between the refrigerant and the heat medium does not take place.

[0169] In the high-temperature side heat medium circuit 302, the heat medium pumped from the high-temperature side main pump 312a flows into the heat medium passage 12b of the main water-refrigerant heat exchanger 12. The heat medium heated in the main water-refrigerant heat exchanger 12 flows into the second high-temperature side three-way valve 352b via the first high-temperature side three-way valve 352a. The heat medium that has flowed into the second high-temperature side three-way valve 352b flows into the high-temperature side main outside air heat exchanger 322a and the heater core 38 depending on the aperture of the second high-temperature side three-way valve 352b.

[0170] The heat medium that flows from the second high-temperature side three-way valve 352b into the high-temperature side main outside air heat exchanger 322a releases heat to the outside air. The heat medium that flows from the second high-temperature side three-way valve 352b into the heater core 38 releases heat to the blown air that has passed through the indoor evaporator 15, depending on the opening degree of the air mix door 64. This heats the blown air.

[0171] The flow of refrigerant flowing out from the high-temperature side main outside air heat exchanger 322a and the flow of heat medium flowing out from the heater core 38 join at the heat medium four-way joint 33x. The heat medium flowing out from the heat medium four-way joint 33x is sucked into the high-temperature side main pump 312a.

[0172] In the interior air conditioning unit 60 in the single heating mode, the air blown from the interior blower 62 passes through the interior evaporator 15. The temperature of the air that has passed through the interior evaporator 15 is adjusted to approach the target outlet temperature TAO by adjusting the opening degree of the air mix door 64. The temperature-adjusted air is then blown into the vehicle cabin, thereby heating the vehicle cabin.

[0173] (b-2) Large independent heating mode In the main refrigeration cycle 10 in the large single heating mode, the control device 70 controls the operation of the various components in the same manner as in the single heating mode.

[0174] In addition, in the sub-refrigeration cycle 20 in the large single heating mode, the control device 70 operates the sub-compressor 21. Furthermore, the control device 70 puts the sub-expansion valve 24 into a throttle state and closes the sub-on / off valve 28.

[0175] More specifically, the control device 70 controls the refrigerant discharge capacity of the sub-compressor 21 so that the sub-discharge refrigerant temperature Td2 detected by the sub-discharge refrigerant sensor 721b approaches the target high pressure PDO2. The target high pressure PDO2 is determined in the same manner as the target high pressure PDO1. The target high pressure PDO1 and the target high pressure PDO2 are set to the same values. In addition, the control device 70 controls the throttle opening of the sub-expansion valve 24 in the same manner as in the single cooling mode.

[0176] In the heat medium circuit 30 in the large single heating mode, the control device 70 operates the low-temperature side pump 311, the main high-temperature side pump 312a, and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0177] Furthermore, the controller 70 controls the operation of the first low-temperature side three-way valve 351a, the second low-temperature side three-way valve 351b, and the first high-temperature side three-way valve 352a, as in the single heating mode. The controller 70 also controls the operation of the third high-temperature side three-way valve 352c so that the entire flow of heat medium that has flowed into the interior flows out to the third heat medium three-way joint 33c. The controller 70 also controls the operation of the second high-temperature side three-way valve 352b so that the entire flow of heat medium that has flowed into the interior flows into the heater core 38.

[0178] In addition, in the indoor air conditioning unit 60 in the large single heating mode, the control device 70 controls the operation of the various components in the same manner as in the single heating mode.

[0179] Therefore, in the main refrigeration cycle 10 in the large-capacity single heating mode, the main refrigerant circulates in the same manner as in the large-capacity single cooling mode, as shown by the solid arrows in Figure 7. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the main chiller 16, the main refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0180] In the secondary refrigeration cycle 20 in the large single heating mode, the secondary refrigerant circulates as in the single cooling mode, as shown by the solid arrows in Fig. 7. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant dissipates heat to the heat medium, heating the heat medium. In the secondary chiller 26, the secondary refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0181] In the heat medium circuit 30 in the large single heating mode, the heat medium circulates as shown by the dashed arrows in Fig. 7. In the low-temperature side heat medium circuit 301, the heat medium circulates in the same way as in the single heating mode. In the low-temperature side outdoor air heat exchanger 321, the heat medium absorbs heat from the outdoor air.

[0182] The heat medium flowing out of the low-temperature side outdoor air heat exchanger 321 flows into the heat medium passage 16b of the main chiller 16 via the low-temperature side passage 36b of the high-low temperature heat exchanger 36. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur. In the main chiller 16, the heat medium is cooled and flows into the heat medium passage 26b of the sub-chiller 26. In the sub-chiller 26, the heat medium is further cooled.

[0183] In the high-temperature side heat medium circuit 302, the heat medium pumped from the high-temperature side main pump 312a flows into the heat medium passage 12b of the main water-refrigerant heat exchanger 12. The heat medium heated in the main water-refrigerant heat exchanger 12 flows into one inlet of the third heat medium three-way joint 33c via the first high-temperature side three-way valve 352a.

[0184] Furthermore, the heat medium pumped from the secondary high-temperature side pump 312b flows into the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22. The heat medium heated in the secondary water-refrigerant heat exchanger 22 flows into the other inlet of the third heat medium three-way joint 33c via the third high-temperature side three-way valve 352c.

[0185] At the third heat medium three-way joint 33c, the flow of the heat medium heated in the main water-refrigerant heat exchanger 12 and the flow of the heat medium heated in the secondary water-refrigerant heat exchanger 22 join together. That is, in this embodiment, the heat medium passage 12b of the main water-refrigerant heat exchanger 12 and the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22 are connected in parallel with respect to the heat medium flow.

[0186] The heat medium flowing out from the third heat medium three-way joint 33c flows into the heater core 38 via the second high-temperature side three-way valve 352b. The heat medium flowing into the heater core 38 dissipates heat into the blown air. This heats the blown air.

[0187] The flow of heat medium flowing out from the heater core 38 is branched at the heat medium four-way joint 33x. One of the heat medium branches at the heat medium four-way joint 33x is drawn into the sub-high-temperature side pump 312b. The other heat medium branched at the heat medium four-way joint 33x is drawn into the main high-temperature side pump 312a.

[0188] Furthermore, in the interior air conditioning unit 60 in the large single heating mode, the temperature-adjusted blown air is blown into the vehicle compartment, thereby heating the vehicle compartment, as in the single heating mode.

[0189] As described above, in the high-power single heating mode, the heater core 38 heats the blown air using both the heat medium heated in the main water-refrigerant heat exchanger 12 and the heat medium heated in the secondary water-refrigerant heat exchanger 22 as heat sources. Therefore, in the high-power single heating mode, the heating capacities of both the main refrigeration cycle 10 and the secondary refrigeration cycle 20 are utilized to heat the vehicle interior with a heating capacity higher than that in the single heating mode.

[0190] (c) Cooling mode The cooling mode is an operation mode that cools the vehicle cabin without cooling the battery 80. In the control program of this embodiment, the cooling mode is often selected when the auto switch and the air conditioner switch are on and the target air outlet temperature TAO is in a low temperature range of 10°C or less, or when the outside air temperature Tam is relatively high.

[0191] The cooling modes include a single cooling mode and a large single cooling mode. The single cooling mode is a first object normal cooling mode that uses the cooling capacity of the main refrigeration cycle 10 to cool the blown air and cool the vehicle cabin. The large single cooling mode is a first object large cooling mode that uses the cooling capacity of the main refrigeration cycle 10 and the sub refrigeration cycle 20 to cool the blown air and cool the vehicle cabin with a cooling capacity higher than that of the single cooling mode.

[0192] The large single cooling mode is selected when, during the single cooling mode, the air mix door 64 is displaced to a position that allows the entire volume of air blown from the indoor blower 62 to flow into the cold air bypass passage 65, but the blown air temperature TAV does not drop to the target blown air temperature TAO.

[0193] (c-1) Single cooling mode In the main refrigeration cycle 10 in the sole cooling mode, the control device 70 operates the main compressor 11. Furthermore, the control device 70 places the cooling expansion valve 14a in a throttled state and the cooling expansion valve 14b in a fully closed state.

[0194] More specifically, the controller 70 controls the refrigerant discharge capacity of the main compressor 11 so that the first main evaporator-side refrigerant temperature Ts11 detected by the first main evaporator-side refrigerant sensor 722a approaches the target first main evaporator-side refrigerant temperature TEO1. The target first main evaporator-side refrigerant temperature TEO1 is determined based on the target outlet temperature TAO by referring to a control map stored in advance in the controller 70.

[0195] The control device 70 also controls the throttle opening of the cooling expansion valve 14a so that the degree of superheat SH1 of the main refrigerant on the refrigerant outlet side of the indoor evaporator 15 approaches a predetermined reference degree of superheat KSH1. The control device 70 detects the degree of superheat SH1 based on the first main evaporator-side refrigerant temperature Ts11 and the first main evaporator-side refrigerant pressure Ps11 detected by the first main evaporator-side refrigerant sensor 722a.

[0196] In addition, in the sub-refrigeration cycle 20 in the single heating mode, the control device 70 stops the sub-compressor 21.

[0197] In the heat medium circuit 30 in the single cooling mode, the control device 70 operates the main high-temperature side pump 312a and stops the low-temperature side pump 311 and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity. Furthermore, the control device 70 controls the operation of the first high-temperature side three-way valve 352a and the second high-temperature side three-way valve 352b, as in the single heating mode.

[0198] The operation mode for cooling the passenger compartment is executed when the outside air temperature Tam is relatively high. Therefore, in the operation mode for cooling the passenger compartment, the control device 70 often controls the operation of the second high-temperature side three-way valve 352b so that more heat medium flows toward the high-temperature side main outside air heat exchanger 322a than toward the heater core 38.

[0199] In addition, in the indoor air conditioning unit 60 in the sole cooling mode, the control device 70 controls the operation of the various components in the same manner as in the sole heating mode.

[0200] Therefore, in the main refrigeration cycle 10 in the sole cooling mode, the main refrigerant circulates as shown by the solid arrows in Figure 8. In the main refrigeration cycle 10 in the sole cooling mode, a vapor compression refrigeration cycle is configured in which the main water-refrigerant heat exchanger 12 functions as a condenser and the indoor evaporator 15 functions as an evaporator. In the main water-refrigerant heat exchanger 12, the refrigerant releases heat to the heat medium, heating the heat medium. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the blown air.

[0201] In the secondary refrigeration cycle 20 in the single cooling mode, the secondary refrigerant does not circulate, as shown in FIG.

[0202] In the heat medium circuit 30 in the sole cooling mode, the heat medium circulates as shown by the dashed arrows in Fig. 8. In the high-temperature side heat medium circuit 302, as in the sole heating mode, the heat medium heated in the main water-refrigerant heat exchanger 12 flows into the high-temperature side main outdoor air heat exchanger 322a and the heater core 38. In the high-temperature side main outdoor air heat exchanger 322a, the heat medium dissipates heat to the outside air. In the heater core 38, the blown air is heated.

[0203] In the interior air conditioning unit 60 in the single cooling mode, the air blown from the interior blower 62 is cooled as it passes through the interior evaporator 15. The temperature of the air cooled by the interior evaporator 15 is adjusted to approach the target outlet temperature TAO by adjusting the opening degree of the air mix door 64. The temperature-adjusted air is then blown into the vehicle cabin, thereby cooling the vehicle cabin.

[0204] (c-2) Large independent cooling mode In the main refrigeration cycle 10 in the large single cooling mode, the control device 70 controls the operation of the various components in the same manner as in the single cooling mode.

[0205] In addition, in the sub-refrigeration cycle 20 in the large-capacity single cooling mode, the control device 70 operates the sub-compressor 21. Furthermore, the control device 70 throttles the sub-expansion valve 24 and closes the sub-on / off valve 28. More specifically, the control device 70 controls the refrigerant discharge capacity of the sub-compressor 21 so that the sub-evaporation section-side heat medium temperature TWB2 approaches a predetermined target sub-evaporation section-side heat medium temperature KTWBO2 for the cooling mode.

[0206] In the heat medium circuit 30 in the large single cooling mode, the control device 70 operates the low-temperature side pump 311, the main high-temperature side pump 312a, and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0207] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a so that the entire flow of heat medium that has flowed into the interior flows out to the heat medium bypass passage 371. The control device 70 also controls the operation of the first high-temperature side three-way valve 352a so that the heat medium that has flowed into the interior flows out to both the second high-temperature side three-way valve 352b and the high-low temperature heat exchanger 36. The control device 70 also controls the operation of the second high-temperature side three-way valve 352b so that the entire flow of heat medium that has flowed into the interior flows out to the high-temperature side main external air heat exchanger 322a. The control device 70 also controls the operation of the third high-temperature side three-way valve 352c, as in the single cooling mode.

[0208] In addition, in the indoor air conditioning unit 60 in the large single cooling mode, the control device 70 controls the operation of the various components in the same manner as in the single cooling mode.

[0209] Therefore, in the main refrigeration cycle 10 in the large-capacity single cooling mode, the main refrigerant circulates in the same manner as in the single cooling mode, as shown by the solid arrows in Figure 9. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the blown air.

[0210] In the secondary refrigeration cycle 20 in the large single cooling mode, the secondary refrigerant circulates as in the single cooling mode, as shown by the solid arrows in Figure 9. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant dissipates heat to the heat medium, heating the heat medium. In the secondary chiller 26, the secondary refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0211] In the heat medium circuit 30 in the large-capacity single cooling mode, the heat medium circulates as shown by the dashed arrows in Fig. 9. In the low-temperature side heat medium circuit 301, the heat medium cooled in the sub-chiller 26 is drawn into the low-temperature side pump 311. The heat medium pumped from the low-temperature side pump 311 flows into the low-temperature side passage 36b of the high-low temperature heat exchanger 36 via the heat medium bypass passage 371.

[0212] In the high-low temperature heat exchanger 36, heat is exchanged between the low-temperature heat medium circulating through the low-temperature side passage 36b and the high-temperature heat medium circulating through the high-temperature side passage 36a. As a result, the heat medium circulating through the low-temperature side passage 36b is heated and the heat medium circulating through the high-temperature side passage 36a is cooled. In other words, the heat of the heat medium circulating through the high-temperature side heat medium circuit 302 is transferred to the heat medium circulating through the low-temperature side heat medium circuit 301.

[0213] The heat medium flowing out from the low-temperature side passage 36b of the high-low temperature heat exchanger 36 passes through the heat medium passage 16b of the main chiller 16 and flows into the heat medium passage 26b of the sub-chiller 26, where it is cooled. In the main chiller 16, the main refrigerant does not flow into the refrigerant passage 16a, so heat exchange between the main refrigerant and the heat medium does not take place.

[0214] In the high-temperature side heat medium circuit 302, the heat medium pumped from the main high-temperature side pump 312a flows into the heat medium passage 12b of the main water-refrigerant heat exchanger 12. The heat medium heated in the main water-refrigerant heat exchanger 12 flows out through the first high-temperature side three-way valve 352a to the high-low temperature heat exchanger 36 side and the second high-temperature side three-way valve 352b side.

[0215] The heat medium that flows from the first high-temperature side three-way valve 352a into the high-temperature side passage 36a of the high-low temperature heat exchanger 36 is cooled by heat exchange with the heat medium flowing through the low-temperature side passage 36b. The heat medium that flows out of the high-temperature side passage 36a of the high-low temperature heat exchanger 36 flows into one inlet of the fourth heat medium three-way joint 33d.

[0216] The heat medium that flows out from the first high-temperature side three-way valve 352a to the second high-temperature side three-way valve 352b flows into the high-temperature side main outdoor air heat exchanger 322a. The heat medium that flows into the high-temperature side main outdoor air heat exchanger 322a dissipates heat into the outside air. The heat medium that flows out of the high-temperature side main outdoor air heat exchanger 322a flows into the other inlet of the fourth heat medium three-way joint 33d.

[0217] At the fourth heat medium three-way joint 33d, the flow of the heat medium flowing out from the high-temperature side passage 36a of the high-low temperature heat exchanger 36 and the flow of the heat medium flowing out from the high-temperature side main external air heat exchanger 322a join together. The heat medium flowing out from the fourth heat medium three-way joint 33d is sucked into the high-temperature side main pump 312a.

[0218] Furthermore, in the high temperature side heat medium circuit 302, the heat medium heated in the secondary water-refrigerant heat exchanger 22 circulates in the same manner as in the large single cooling mode. In the high temperature side secondary outside air heat exchanger 322b, the heat medium dissipates heat to the outside air.

[0219] Furthermore, in the interior air conditioning unit 60 in the large single cooling mode, the temperature-adjusted blown air is blown into the vehicle compartment, thereby cooling the vehicle compartment, just as in the single cooling mode.

[0220] As described above, in the large-capacity single cooling mode, the blown air is cooled by utilizing the cooling capacities of both the main refrigeration cycle 10 and the sub-refrigeration cycle 20. Therefore, in the large-capacity single cooling mode, the vehicle cabin can be cooled with a higher cooling capacity than in the single cooling mode.

[0221] More specifically, in the large-capacity single cooling mode, the high-low-temperature heat exchanger 36 can lower the temperature of the heat medium circulating through the high-temperature-side passage 36a. This can lower the pressure of the refrigerant in the refrigerant passage 12a of the main water-refrigerant heat exchanger 12 from P1 to P2, as shown in the Mollier diagram of Fig. 10. As a result, in the large-capacity single cooling mode, the amount of heat absorbed by the refrigerant from the blown air in the indoor evaporator 15 can be increased from Δh1 to Δh2, thereby improving the cooling capacity of the blown air compared to the single cooling mode.

[0222] 10, the state of the refrigerant in the single cooling mode is indicated by a dashed line, and the state of the refrigerant in the large single cooling mode is indicated by a solid line. Also, the refrigerant pressure in the refrigerant passage 12a of the main water-refrigerant heat exchanger 12 in the single cooling mode is indicated by P1, and the refrigerant pressure in the refrigerant passage 12a of the main water-refrigerant heat exchanger 12 in the large single cooling mode is indicated by P2.

[0223] Furthermore, the specific enthalpy difference obtained by subtracting the specific enthalpy of the inlet side refrigerant from the specific enthalpy of the outlet side refrigerant in the indoor evaporator 15 in the single cooling mode is indicated by Δh1, and the specific enthalpy difference in the indoor evaporator 15 in the large single cooling mode is indicated by Δh2. The cooling capacity of the blown air in the indoor evaporator 15 can be defined as the value obtained by multiplying the specific enthalpy difference by the refrigerant flow rate.

[0224] (d) Cooling mode The cooling / air-conditioning mode is an operation mode that cools the vehicle interior while also cooling the battery 80. In other words, the cooling / air-conditioning mode is an operation mode that cools both the first temperature adjustment object and the second temperature adjustment object.

[0225] The cooling / cooling modes include a normal cooling / cooling mode and a high-power cooling / cooling mode. The normal cooling / cooling mode is a multiple object normal cooling mode that uses the cooling capacity of the main refrigeration cycle 10 to cool the battery 80 and also cool the vehicle interior. In the control program of this embodiment, the normal cooling / cooling mode is selected when it is determined that cooling of the battery 80 is necessary while the single cooling mode or the high-power single cooling mode is being executed.

[0226] In the control program of this embodiment, a determination similar to step S41 in Figure 4 described above is made at predetermined intervals to determine whether cooling of the battery 80 is necessary while the single cooling mode or the large single cooling mode is being executed.

[0227] The high cooling mode is a multiple object high cooling mode that cools the battery 80 and the vehicle interior by utilizing the cooling capacities of the main refrigeration cycle 10 and the sub refrigeration cycle 20. In the control program of this embodiment, the high cooling mode is selected when the battery temperature TB does not decrease even after a predetermined time has elapsed after the normal cooling mode is executed.

[0228] (d-1) Normal cooling mode In the main refrigeration cycle 10 in the normal cooling / cooling mode, the control device 70 operates the main compressor 11. Furthermore, the control device 70 throttles the cooling expansion valve 14a and throttles the cooling expansion valve 14b. Therefore, in the main refrigeration cycle 10 in the normal cooling / cooling mode, the indoor evaporator 15 and the main chiller 16 are connected in parallel with respect to the refrigerant flow.

[0229] More specifically, the control device 70 controls the refrigerant discharge capacity of the main compressor 11 and the throttle opening of the cooling expansion valve 14a, as in the stand-alone cooling mode. In addition, the control device 70 controls the throttle opening of the cooling expansion valve 14b so as to achieve a predetermined throttle opening for the cooling / cooling mode.

[0230] In addition, in the sub-refrigeration cycle 20 in the normal cooling / air-conditioning mode, the control device 70 stops the sub-compressor 21.

[0231] In addition, in the heat medium circuit 30 in the normal cooling / air-conditioning mode, the control device 70 operates the low-temperature side pump 311 and the main high-temperature side pump 312a and stops the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0232] Furthermore, the controller 70 controls the operation of the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b, as in the single cooling mode. Also, the controller 70 controls the operation of the first high-temperature side three-way valve 352a and the second high-temperature side three-way valve 352b, as in the single heating mode.

[0233] In addition, in the indoor air conditioning unit 60 in the normal cooling / air-conditioning mode, the control device 70 controls the operation of the various components in the same manner as in the single heating mode.

[0234] Therefore, in the main refrigeration cycle 10 in the normal cooling / cooling mode, the main refrigerant circulates as shown by the solid arrows in Figure 11. In the main refrigeration cycle 10 in the normal cooling / cooling mode, the main water-refrigerant heat exchanger 12 functions as a condenser, and the indoor evaporator 15 and the main chiller 16 function as evaporators, forming a vapor compression refrigeration cycle.

[0235] In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the blown air. In the main chiller 16, the main refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0236] In the secondary refrigeration cycle 20 in the normal cooling / air-cooling mode, the secondary refrigerant does not circulate, as shown in FIG.

[0237] In the heat medium circuit 30 in the normal cooling mode, the heat medium circulates as shown by the dashed arrows in Fig. 11. In the low-temperature side heat medium circuit 301, the heat medium cooled in the main chiller 16 is drawn into the low-temperature side pump 311 via the heat medium passage 26b of the sub-chiller 26. In the sub-chiller 26, the sub-refrigerant does not flow into the refrigerant passage 26a, so heat exchange between the sub-refrigerant and the heat medium does not take place.

[0238] The heat medium pumped from the low-temperature side pump 311 flows through the coolant passage 80a of the battery 80 via the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b. This cools the battery 80.

[0239] The heat medium flowing out of the battery 80 flows through the low-temperature side passage 36b of the high-low temperature heat exchanger 36 into the heat medium passage 16b of the main chiller 16 and is cooled. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur.

[0240] In the high-temperature side heat medium circuit 302, as in the single heating mode, the heat medium heated in the main water-refrigerant heat exchanger 12 flows into the high-temperature side main outdoor air heat exchanger 322a and the heater core 38. In the high-temperature side main outdoor air heat exchanger 322a, the heat medium dissipates heat to the outdoor air. In the heater core 38, the heat medium dissipates heat to the blown air, heating the blown air.

[0241] In addition, in the interior air conditioning unit 60 in the cooling / air-conditioning mode, the temperature-adjusted air is blown into the vehicle compartment, thereby cooling the vehicle compartment, as in the single cooling mode.

[0242] (d-2) Large cooling mode In the main refrigeration cycle 10 in the large cooling / air-conditioning mode, the control device 70 operates the main compressor 11. Furthermore, the control device 70 puts the cooling expansion valve 14a into a throttle state and the cooling expansion valve 14b into a throttle state.

[0243] In the large cooling air-conditioning mode, the control device 70 makes the same determination as in step S42 at predetermined intervals. When it is determined that the cooling capacity of the battery 80 is sufficient, the control device 70 controls the operation of the various components of the main refrigeration cycle 10 in the same manner as in the normal cooling air-conditioning mode. That is, the control device 70 controls the operation of the various components of the main refrigeration cycle 10 so that the first main evaporator-side refrigerant temperature Ts11 approaches the target first main evaporator-side refrigerant temperature TEO1.

[0244] On the other hand, when it is determined that the cooling capacity of the battery 80 is insufficient, the operation of the various components of the main refrigeration cycle 10 is controlled in the same manner as in the large single cooling mode. That is, the operation of the various components of the main refrigeration cycle 10 is controlled so that the main evaporator-side heat medium temperature TWB1 approaches the target main evaporator-side heat medium temperature TWBO1.

[0245] In the secondary refrigeration cycle 20 in the large cooling mode, the control device 70 controls the operation of the various components of the secondary refrigeration cycle 20 in the same manner as in the single cooling mode. That is, the operation of the various components of the secondary refrigeration cycle 20 is controlled so that the secondary evaporator-side heat medium temperature TWB2 approaches the target secondary evaporator-side heat medium temperature KTWBO2.

[0246] Here, the first main evaporator-side refrigerant temperature Ts11 is the temperature of the main refrigerant on the outlet side of the indoor evaporator 15, and therefore corresponds to the temperature of the blown air immediately after passing through the indoor evaporator 15. Therefore, in the high-cooling mode, when the cooling capacity of the battery 80 is sufficient, the operation of the various components of the main refrigeration cycle 10 and the various components of the sub refrigeration cycle 20 is controlled so that the temperature of the blown air approaches the target first main evaporator-side refrigerant temperature TEO1.

[0247] As described in the cooling mode, the target main evaporator side heat medium temperature TWBO1 and the target sub-evaporator side heat medium temperature TWBO2 are determined so that the temperature of the battery 80 approaches the target battery temperature TBO. Therefore, in the high-cooling cooling mode, when the cooling capacity of the battery 80 is insufficient, the operation of the various components of the main refrigeration cycle 10 and the sub refrigeration cycle 20 is controlled so that the battery temperature TB approaches the target battery temperature TBO.

[0248] That is, the target first main evaporator-side refrigerant temperature TEO1 is a target first object temperature, and the target battery temperature TBO is a target second object temperature.

[0249] In the heat medium circuit 30 in the large cooling mode, the control device 70 operates the low-temperature side pump 311, the main high-temperature side pump 312a, and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0250] Furthermore, the controller 70 controls the operation of the first low-temperature side three-way valve 351a, the second low-temperature side three-way valve 351b, the first high-temperature side three-way valve 352a, and the second high-temperature side three-way valve 352b, as in the normal cooling / air-cooling mode. The controller 70 also controls the operation of the third high-temperature side three-way valve 352c, as in the single cooling mode.

[0251] In addition, in the indoor air conditioning unit 60 in the large cooling mode, the control device 70 controls the operation of the various components in the same manner as in the single heating mode.

[0252] Therefore, in the main refrigeration cycle 10 in the large cooling / cooling mode, the main refrigerant circulates in the same way as in the normal cooling / cooling mode, as shown by the solid arrows in Figure 12. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the air. In the main chiller 16, the main refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0253] In the secondary refrigeration cycle 20 in the large cooling mode, the secondary refrigerant circulates as in the single cooling mode, as shown by the solid arrows in Fig. 12. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant dissipates heat to the heat medium, heating the heat medium. In the secondary chiller 26, the secondary refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0254] In the heat medium circuit 30 in the large cooling cooling mode, the heat medium circulates in the same way as in the normal cooling cooling mode, as indicated by the dashed arrows in Fig. 12. In the low-temperature side heat medium circuit 301, the heat medium cooled by the sub-chiller 26 is drawn into the low-temperature side pump 311. The heat medium pumped from the low-temperature side pump 311 flows through the coolant passage 80a of the battery 80, in the same way as in the normal cooling cooling mode. This cools the battery 80.

[0255] The heat medium flowing out of the battery 80 flows through the low-temperature side passage 36b of the high-low temperature heat exchanger 36 into the heat medium passage 16b of the main chiller 16 and is cooled. In the high-low temperature heat exchanger 36, the heat medium does not flow through the high-temperature side passage 36a, so heat exchange between the heat mediums does not occur. The heat medium cooled in the heat medium passage 16b of the main chiller 16 flows into the heat medium passage 26b of the sub-chiller 26. In the sub-chiller 26, the heat medium is further cooled.

[0256] In the high-temperature side heat medium circuit 302, as in the normal cooling / air-conditioning mode, the heat medium heated in the main water-refrigerant heat exchanger 12 flows into the high-temperature side main outside air heat exchanger 322a and the heater core 38. In the high-temperature side main outside air heat exchanger 322a, the heat medium dissipates heat to the outside air. In the heater core 38, the heat medium dissipates heat to the blown air, heating the blown air.

[0257] In addition, in the interior air conditioning unit 60 in the large cooling mode, the temperature-adjusted blown air is blown into the vehicle compartment, thereby cooling the vehicle compartment, as in the normal cooling mode.

[0258] As described above, the high cooling mode can cool the vehicle interior. Furthermore, by utilizing the cooling capacities of both the main refrigeration cycle 10 and the sub refrigeration cycle 20, the battery 80 can be cooled with a higher cooling capacity than in the normal cooling mode.

[0259] (e) Dehumidifying heating mode The dehumidifying and heating mode is an operating mode in which cooled and dehumidified ventilation air is reheated and blown into the passenger compartment to dehumidify and heat the passenger compartment without cooling the battery 80. In the control program of this embodiment, the dehumidifying and heating mode is often selected when the auto switch and air conditioner switch are on and the target outlet temperature TAO is in the intermediate temperature range of 10°C or higher and lower than 25°C, or when the outside air temperature Tam is in the intermediate temperature range.

[0260] The dehumidifying and heating modes include a normal dehumidifying and heating mode and a large dehumidifying and heating mode. The normal dehumidifying and heating mode is a first-object normal reheating mode that uses the heating capacity of the main refrigeration cycle 10 to reheat dehumidified blown air to dehumidify and heat the vehicle cabin. The large dehumidifying and heating mode is a first-object large reheating mode that uses the heating capacity of the main refrigeration cycle 10 and the sub refrigeration cycle 20 to reheat dehumidified blown air to dehumidify and heat the vehicle cabin.

[0261] The large dehumidification heating mode is selected when, during normal dehumidification heating mode, the air mix door 64 is displaced to a position that allows the entire volume of air blown from the indoor blower 62 to flow into the heater core 38, but the blown air temperature TAV does not rise to the target blown air temperature TAO.

[0262] (e-1) Normal dehumidifying heating mode In the normal dehumidifying heating mode, the control device 70 controls the operation of the various components in the same manner as in the single cooling mode.

[0263] Therefore, in the main refrigeration cycle 10 in the normal dehumidifying heating mode, the main refrigerant circulates in the same manner as in the single cooling mode, as shown by the solid arrows in Figure 8. The heat medium is heated in the main water-refrigerant heat exchanger 12. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the blown air.

[0264] In the secondary refrigeration cycle 20 in the normal dehumidifying heating mode, as shown in FIG. 8, the secondary refrigerant does not circulate, as in the single cooling mode.

[0265] In the heat medium circuit 30 in the normal dehumidifying and heating mode, the heat medium circulates in the same manner as in the single cooling mode, as shown by the dashed arrows in Fig. 8. In the high-temperature side heat medium circuit 302, the heat medium heated in the main water-refrigerant heat exchanger 12 flows into the high-temperature side main outdoor air heat exchanger 322a and the heater core 38. In the high-temperature side main outdoor air heat exchanger 322a, the heat medium dissipates heat to the outdoor air. In the heater core 38, the heat medium dissipates heat to the blown air, heating the blown air.

[0266] In the interior air conditioning unit 60 in the normal dehumidifying and heating mode, the air blown from the interior blower 62 is cooled as it passes through the interior evaporator 15. The cooled air is reheated by adjusting the opening of the air mix door 64 so that the air approaches the target outlet temperature TAO. The reheated air is then blown into the vehicle cabin, thereby achieving dehumidifying and heating the vehicle cabin.

[0267] (e-2) Large dehumidification heating mode In the main refrigeration cycle 10 in the large dehumidification heating mode, the control device 70 controls the operation of the various components in the same manner as in the single cooling mode.

[0268] In addition, in the secondary refrigeration cycle 20 in the large dehumidifying heating mode, the control device 70 controls the operation of the various components in the same manner as in the large single heating mode.

[0269] In the heat medium circuit 30 in the large dehumidification heating mode, the control device 70 controls the operations of the various components in the same manner as in the large single heating mode.

[0270] In addition, in the indoor air conditioning unit 60 in the large dehumidification heating mode, the control device 70 controls the operation of the various components in the same manner as in the single heating mode.

[0271] Therefore, in the main refrigeration cycle 10 in the large dehumidification heating mode, the main refrigerant circulates in the same way as in the normal dehumidification heating mode, as shown by the solid arrows in Figure 13. In the main water-refrigerant heat exchanger 12, the main refrigerant dissipates heat to the heat medium, heating the heat medium. In the indoor evaporator 15, the main refrigerant absorbs heat from the blown air, cooling the blown air.

[0272] In the secondary refrigeration cycle 20 in the large dehumidification and heating mode, the secondary refrigerant circulates as in the single cooling mode, as shown by the solid arrows in Fig. 13. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant dissipates heat to the heat medium, heating the heat medium. In the secondary chiller 26, the secondary refrigerant absorbs heat from the heat medium, cooling the heat medium.

[0273] In the heat medium circuit 30 in the large dehumidification heating mode, the heat medium circulates in the same way as in the large single heating mode, as indicated by the dashed arrows in Fig. 13. In the low-temperature side outdoor air heat exchanger 321 of the low-temperature side heat medium circuit 301, the heat medium absorbs heat from the outdoor air.

[0274] In the high temperature side heat medium circuit 302, the flow of the heat medium heated in the main water-refrigerant heat exchanger 12 and the flow of the heat medium heated in the secondary water-refrigerant heat exchanger 22 join together at the third heat medium three-way joint 33c and flow into the heater core 38. In the heater core 38, the heat medium dissipates heat to the blown air, heating the blown air.

[0275] In the interior air conditioning unit 60 in the large dehumidification heating mode, similarly to the normal dehumidification heating mode, the blown air cooled by the interior evaporator 15 is reheated to approach the target blown air temperature TAO by adjusting the opening degree of the air mix door 64. The reheated blown air is then blown into the vehicle cabin, thereby realizing dehumidification and heating of the vehicle cabin.

[0276] As described above, in the heater core 38 in the large dehumidification heating mode, as in the large single heating mode, the blown air can be heated using both the heat medium heated in the main water-refrigerant heat exchanger 12 and the heat medium heated in the secondary water-refrigerant heat exchanger 22 as heat sources. Therefore, in the large dehumidification heating mode, the heating capacities of both the main refrigeration cycle 10 and the secondary refrigeration cycle 20 can be used to reheat the blown air with a heating capacity higher than that in the normal dehumidification heating mode.

[0277] (f) Warm-up mode The warm-up mode is an operation mode in which the battery 80 is heated without air conditioning the interior of the vehicle.

[0278] The warm-up modes include a normal warm-up mode and a large warm-up mode. The normal warm-up mode is a second object normal heating mode that warms up the battery 80 using the heating capacity of the electric heater 39. The large warm-up mode is a second object large heating mode that warms up the battery 80 with a heating capacity higher than that of the normal warm-up mode, using the heating capacity of the electric heater 39 and the secondary refrigeration cycle 20.

[0279] The control program selects the normal warm-up mode when the battery temperature TB is lower than a predetermined reference warm-up temperature KTBL, and then selects the large warm-up mode when the battery temperature TB does not rise above the reference warm-up temperature KTBL even after a predetermined time has elapsed since the normal warm-up mode was executed.

[0280] (f-1) Normal warm-up mode In the main refrigeration cycle 10 in the normal warm-up mode, the control device 70 stops the main compressor 11.

[0281] In addition, in the sub-refrigeration cycle 20 in the normal warm-up mode, the control device 70 stops the sub-compressor 21.

[0282] In the heat medium circuit 30 in the normal warm-up mode, the control device 70 operates the low-temperature side pump 311 and the main high-temperature side pump 312a and stops the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0283] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b, as in the single cooling mode. The control device 70 also controls the operation of the first high-temperature side three-way valve 352a so that the heat medium that has flowed into the interior flows out to both the second high-temperature side three-way valve 352b side and the high-low temperature heat exchanger 36 side. The control device 70 also controls the operation of the second high-temperature side three-way valve 352b so that the entire flow of the heat medium that has flowed into the interior flows out to the heater core 38 side. The control device 70 also operates the electric heater 39.

[0284] Furthermore, in the indoor air conditioning unit 60 in the normal warm-up mode, the control device 70 stops the indoor blower 62, as in the single cooling mode.

[0285] Therefore, in the main refrigeration cycle 10 in the normal warm-up mode, the main refrigerant does not circulate, as shown in Fig. 14. Also, in the secondary refrigeration cycle 20 in the normal warm-up mode, the secondary refrigerant does not circulate, as shown in Fig. 14.

[0286] In the heat medium circuit 30 in the normal warm-up mode, the heat medium circulates as shown by the dashed arrows in Fig. 14. In the high-temperature side heat medium circuit 302, the heat medium pumped from the high-temperature side main pump 312a flows into the first high-temperature side three-way valve 352a via the heat medium passage 12b of the main water-refrigerant heat exchanger 12. In the main water-refrigerant heat exchanger 12, the main refrigerant does not flow into the refrigerant passage 12a, so heat exchange between the main refrigerant and the heat medium does not take place.

[0287] The heat medium that flows into the first high-temperature side three-way valve 352a flows out to the third heat medium three-way joint 33c and the high-low temperature heat exchanger 36. The heat medium that flows out from the first high-temperature side three-way valve 352a to the third heat medium three-way joint 33c flows out to the heater core 38 via the second high-temperature side three-way valve 352b.

[0288] The heat medium that flows out toward the heater core 38 is heated by the electric heater 39 and flows into the heater core 38. In the heater core 38, since the indoor blower 62 is stopped, heat exchange between the heat medium and the blown air does not occur. The heat medium that flows out from the heater core 38 flows into the other inlet of the heat medium four-way joint 33x.

[0289] The heat medium flowing out from the first high-temperature side three-way valve 352a to the high-low temperature heat exchanger 36 side flows into the high-temperature side passage 36a of the high-low temperature heat exchanger 36. The heat medium flowing into the high-temperature side passage 36a exchanges heat with the heat medium flowing through the low-temperature side passage 36b and is cooled. This heats the heat medium flowing through the low-temperature side passage 36b. The heat medium flowing out from the high-temperature side passage 36a flows into the other inlet of the heat medium four-way joint 33x via the fourth heat medium three-way joint 33d.

[0290] At the heat medium four-way joint 33x, the flow of the heat medium flowing out from the high-temperature side passage 36a of the high-low temperature heat exchanger 36 and the flow of the heat medium flowing out from the heater core 38 join together. The heat medium flowing out from the heat medium four-way joint 33x is sucked into the main high-temperature side pump 312a and is pumped to the heat medium passage 12b side of the main water-refrigerant heat exchanger 12.

[0291] In the low-temperature side heat medium circuit 301, the heat medium heated in the high / low temperature heat exchanger 36 is drawn into the low-temperature side pump 311 via the main chiller 16 and the sub-chiller 26. The heat medium pumped from the low-temperature side pump 311 dissipates heat as it flows through the coolant passage 80a of the battery 80 via the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b. This heats up the battery 80. That is, the battery 80 is warmed up.

[0292] The heat medium flowing out from the coolant passage 80a of the battery 80 flows into the low-temperature side passage 36b of the high-low temperature heat exchanger 36 and is heated there. The heat medium flowing out from the low-temperature side passage 36b of the high-low temperature heat exchanger 36 flows through the heat medium passage 16b of the main chiller 16 and the heat medium passage 26b of the sub-chiller 26, and is drawn into the low-temperature side pump 311. In the main chiller 16, the main refrigerant does not flow into the refrigerant passage 16a, so heat exchange between the main refrigerant and the heat medium does not take place. In the sub-chiller 26, the sub-refrigerant does not flow into the refrigerant passage 26a, so heat exchange between the main refrigerant and the heat medium does not take place.

[0293] Furthermore, in the interior air conditioning unit 60 in the normal warm-up mode, the interior blower 62 is stopped, so that no ventilation air is blown into the vehicle interior.

[0294] As described above, in the normal warm-up mode, the heat of the heat medium heated by the electric heater 39 can be used as a heat source for warming up the battery 80 .

[0295] (f-2) Large warm-up mode In the main refrigeration cycle 10 in the large warm-up mode, the control device 70 stops the main compressor 11. In the secondary refrigeration cycle 20 in the large warm-up mode, the control device 70 operates the secondary compressor 21. Furthermore, the control device 70 fully closes the secondary expansion valve 24 and opens the secondary on-off valve 28. More specifically, the control device 70 operates the secondary compressor 21 so as to exert a predetermined refrigerant discharge capacity for the large warm-up mode.

[0296] In the heat medium circuit 30 in the large warm-up mode, the control device 70 operates the low-temperature side pump 311, the main high-temperature side pump 312a, and the sub-high-temperature side pump 312b so as to exert a predetermined pumping capacity.

[0297] Furthermore, the control device 70 controls the operation of the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b, as in the single cooling mode. The control device 70 also controls the operation of the first high-temperature side three-way valve 352a so that the entire flow of heat medium that has flowed into the interior flows out to the high-low temperature heat exchanger 36. The control device 70 also controls the operation of the second high-temperature side three-way valve 352b so that the entire flow of heat medium that has flowed into the interior flows out to the heater core 38.

[0298] The control device 70 also controls the operation of the third high temperature side three-way valve 352c so that the entire flow of the heat medium that has flowed into the inside flows out to the third heat medium three-way joint 33c side. The control device 70 also operates the electric heater 39.

[0299] Furthermore, in the indoor air conditioning unit 60 in the large warm-up mode, the control device 70 stops the indoor blower 62, as in the normal warm-up mode.

[0300] Therefore, in the main refrigeration cycle 10 in the large warm-up mode, the main refrigerant does not circulate, as shown in FIG.

[0301] In the secondary refrigeration cycle 20 in the large warm-up mode, the secondary refrigerant circulates as shown by the solid arrows in Fig. 15. In the secondary refrigeration cycle 20 in the large warm-up mode, the secondary water-refrigerant heat exchanger 22 functions as a radiator, and the hot gas passage 27 functions as a pressure reducing section, forming a so-called hot gas cycle. In the secondary water-refrigerant heat exchanger 22, the secondary refrigerant radiates heat to the heat medium, thereby heating the heat medium.

[0302] In the heat medium circuit 30 in the large warm-up mode, the heat medium circulates as shown by the dashed arrows in Fig. 15. In the high temperature side heat medium circuit 302, the heat medium pumped from the sub-high temperature side pump 312b flows into the heat medium passage 12b of the sub-water-refrigerant heat exchanger 22 and is heated. The heat medium heated in the sub-water-refrigerant heat exchanger 22 flows into the other inlet of the third heat medium three-way joint 33c via the third high temperature side three-way valve 352c.

[0303] The heat medium pumped from the main high-temperature side pump 312a flows into the first high-temperature side three-way valve 352a, as in the normal warm-up mode. The heat medium that flows into the first high-temperature side three-way valve 352a flows out to the third heat medium three-way joint 33c and the high-low temperature heat exchanger 36. At the third heat medium three-way joint 33c, the flow of the heat medium pumped from the main high-temperature side pump 312a and the flow of the heat medium heated in the secondary water-refrigerant heat exchanger 22 join together.

[0304] The heat medium flowing out from the third heat medium three-way joint 33c flows through the second high-temperature side three-way valve 352b toward the heater core 38. As in the normal warm-up mode, the heat medium flowing out toward the heater core 38 is heated by the electric heater 39 and flows into the heater core 38. The heat medium flowing out from the heater core 38 flows into the other inlet of the heat medium four-way joint 33x.

[0305] The heat medium flowing out from the first high-temperature side three-way valve 352a to the high-low temperature heat exchanger 36 side flows into the high-temperature side passage 36a and exchanges heat with the heat medium flowing through the low-temperature side passage 36b, as in the normal warm-up mode. The heat medium flowing out from the high-temperature side passage 36a flows into the other inlet of the heat medium four-way joint 33x via the fourth heat medium three-way joint 33d.

[0306] At the heat medium four-way joint 33x, the flow of the heat medium flowing out from the high-temperature side passage 36a of the high-low temperature heat exchanger 36 and the flow of the heat medium flowing out from the heater core 38 join together. Furthermore, at the heat medium four-way joint 33x, the joined heat medium flows are branched.

[0307] One of the heat medium branches at the heat medium four-way joint 33x is drawn into the secondary high-temperature side pump 312b and pressure-fed to the heat medium passage 22b side of the secondary water-refrigerant heat exchanger 22. The other heat medium branched at the heat medium four-way joint 33x is drawn into the main high-temperature side pump 312a and pressure-fed to the heat medium passage 12b side of the main water-refrigerant heat exchanger 12.

[0308] In the low-temperature side heat medium circuit 301, as in the normal warm-up mode, the heat medium heated in the high-low temperature heat exchanger 36 is drawn into the low-temperature side pump 311 and pumped to the coolant passage 80a side of the battery 80. This heats the battery 80. That is, the battery 80 is warmed up.

[0309] Furthermore, in the interior air conditioning unit 60 in the normal warm-up mode, the interior blower 62 is stopped, so that no ventilation air is blown into the vehicle interior.

[0310] As described above, in the large warm-up mode, the heat of the heat medium heated by the sub refrigeration cycle 20 and the electric heater 39 can be used as a heat source for warming up the battery 80. Therefore, the battery 80 can be warmed up with a higher heating capacity than in the normal warm-up mode.

[0311] As described above, the vehicle air conditioner 1 of this embodiment can provide comfortable air conditioning for the vehicle interior and adjust the temperature of the battery 80 appropriately by switching the operation mode.

[0312] More specifically, the vehicle air conditioner 1 of this embodiment includes a main refrigeration cycle 10, which allows for temperature regulation of the blown air and the heat medium. It may also include a sub-refrigeration cycle 20, which allows for temperature regulation of the heat medium. It also includes a heat medium circuit 30, which allows for temperature regulation of the battery 80 by the heat medium.

[0313] This makes it possible to efficiently adjust the temperatures of a plurality of temperature adjustment targets, such as the blown air or the battery 80, by utilizing the temperature adjustment capabilities exhibited by the main refrigeration cycle 10 and the sub refrigeration cycle 20.

[0314] Specifically, the vehicle air conditioner 1 of this embodiment can switch between a single cooling mode and a large single cooling mode. Therefore, the vehicle air conditioner 1 of this embodiment can efficiently cool the battery 80 by switching between the single cooling mode and the large single cooling mode depending on the cooling capacity required to appropriately cool the battery 80.

[0315] Furthermore, the secondary refrigeration cycle 20 of this embodiment can exert a temperature adjustment capability of the heat medium independently of the main refrigeration cycle 10. Therefore, a cycle that exerts an appropriate cooling capability in advance can be adopted as the secondary refrigeration cycle 20 according to the expected heat generation amount of the mounted battery 80.

[0316] In addition, in the large-capacity single cooling mode, the target sub-evaporator side heat medium temperature KTWBO2 of the heat medium flowing out from the sub-chiller 26 is set to a temperature lower than the target main-evaporator side heat medium temperature TWBO1 of the heat medium flowing out from the main chiller 16. In the heat medium circuit 30 in the large-capacity single cooling mode, the heat medium flows in the order of the main chiller 16, the sub-chiller 26, and the coolant passage 80a of the battery 80. Therefore, the heat medium can be efficiently cooled in the order of the main chiller 16 and the sub-chiller 26.

[0317] Furthermore, the vehicle air conditioner 1 of this embodiment can switch between a single heating mode and a large single heating mode. Therefore, the vehicle air conditioner 1 of this embodiment can efficiently heat the vehicle interior by switching between the single heating mode and the large single heating mode depending on the heating capacity required to properly heat the vehicle interior.

[0318] Furthermore, the heating heat medium temperature sensor 73d of this embodiment is disposed to detect the temperature of the heat medium in the heat medium flow path from the third heat medium three-way joint 33c to the heat medium inlet of the heater core 38, downstream of the electric heater 39. This allows the temperature of the heat medium flowing into the heater core 38 to be accurately detected in the high-power single heating mode. Therefore, the temperature of the heat medium flowing into the heater core 38 can be accurately adjusted, and the heating capacity of the heater core 38 can be stabilized.

[0319] Furthermore, the vehicle air conditioner 1 of this embodiment can switch between a single cooling mode and a large single cooling mode. Therefore, the vehicle air conditioner 1 of this embodiment can efficiently cool the vehicle interior by switching between the single cooling mode and the large single cooling mode depending on the cooling capacity required to properly cool the vehicle interior.

[0320] Furthermore, the vehicle air conditioner 1 of this embodiment can switch between a normal cooling mode and a high cooling mode. Therefore, according to the vehicle air conditioner 1 of this embodiment, by switching between the normal cooling mode and the high cooling mode depending on the cooling capacity required to appropriately cool the battery 80, it is possible to cool the vehicle interior and simultaneously efficiently cool the battery 80.

[0321] Furthermore, in the high-cooling cooling mode of this embodiment, when the cooling capacity of the battery 80 is sufficient, the temperature of the blown air is made to approach the target first main evaporator-side refrigerant temperature TEO1. On the other hand, when the cooling capacity of the battery 80 is insufficient, the battery temperature TW is made to approach the target battery temperature TBO. This makes it possible to prioritize cooling of the battery 80 over cooling of the blown air when the cooling capacity of the battery 80 is insufficient. This also makes it possible to protect the battery 80.

[0322] Additionally, in the heat medium circuit 30 in the high-cooling / cooling mode, as in the high-cooling single cooling mode, the cooled heat medium is caused to flow into the coolant passage 80a of the battery 80 in the order of the main chiller 16 and the sub-chiller 26. Therefore, even if the refrigerant evaporation temperature in the main chiller 16 is set to a temperature that can suppress frost formation on the indoor evaporator 15, for example, this is unlikely to affect the temperature of the heat medium that flows into the coolant passage 80a of the battery 80.

[0323] Furthermore, the vehicle air conditioner 1 of this embodiment can switch between a normal dehumidifying and heating mode and a large dehumidifying and heating mode. Therefore, the vehicle air conditioner 1 of this embodiment can efficiently dehumidify and heat the vehicle cabin by switching between the normal dehumidifying and heating mode and the large dehumidifying and heating mode depending on the heating capacity required for appropriate dehumidifying and heating the vehicle cabin.

[0324] Furthermore, the vehicle air conditioner 1 of this embodiment can execute a large warm-up mode in addition to the normal warm-up mode. In the large warm-up mode, the heating capacity of the secondary refrigeration cycle 20 can be used to warm up the battery 80.

[0325] (Second embodiment) In this embodiment, an example will be described in which the heat transfer unit is changed from the vehicle air conditioner 1 of the first embodiment, as shown in the overall configuration diagrams of Figures 16 to 18. Specifically, in the vehicle air conditioner 1a of this embodiment, a heat medium mixing valve 40 is used as the heat transfer unit instead of the high / low temperature heat exchanger 36 described in the first embodiment.

[0326] The heat medium mixing valve 40 is an electric four-way valve whose operation is controlled by a control voltage output from the control device 70. The heat medium mixing valve 40 is a heat medium circuit switching unit that switches the circuit configuration of the heat medium circuit 30. The heat medium mixing valve 40 has two heat medium inlets and two heat medium outlets.

[0327] One heat medium inlet of the heat medium mixing valve 40 is connected to the outlet side of the second heat medium three-way joint 33b. Another heat medium inlet of the heat medium mixing valve 40 is connected to one outlet side of the first high-temperature side three-way valve 352a. One heat medium outlet of the heat medium mixing valve 40 is connected to the inlet side of the heat medium passage 16b of the main chiller 16. Another heat medium outlet of the heat medium mixing valve 40 is connected to one inlet side of the fourth heat medium three-way joint 33d.

[0328] The heat medium mixing valve 40 connects the outlet side of the second heat medium three-way joint 33b to the inlet side of the heat medium passage 16b of the main chiller 16, and can simultaneously switch to a heat medium circuit that connects one outlet side of the first high-temperature side three-way valve 352a to one inlet side of the fourth heat medium three-way joint 33d.

[0329] In other words, the heat medium mixing valve 40 can switch to a heat medium circuit that does not mix the heat medium flowing through the low-temperature side heat medium circuit 301 and the heat medium flowing through the high-temperature side heat medium circuit 302.

[0330] In addition, the heat medium mixing valve 40 can be switched to a heat medium circuit that connects the outlet side of the second heat medium three-way joint 33b to one of the inlet sides of the fourth heat medium three-way joint 33d, and at the same time connects one of the outlet sides of the first high-temperature side three-way valve 352a to the inlet side of the heat medium passage 16b of the main chiller 16.

[0331] In other words, the heat medium mixing valve 40 can switch to a heat medium circuit that mixes the heat medium flowing through the low-temperature side heat medium circuit 301 with the heat medium flowing through the high-temperature side heat medium circuit 302. This allows the heat medium mixing valve 40 to transfer heat between the heat medium flowing through the high-temperature side heat medium circuit 302 and the heat medium flowing through the low-temperature side heat medium circuit 301.

[0332] Other configurations of the vehicle air conditioner 1a are similar to those of the vehicle air conditioner 1 described in the first embodiment.

[0333] Next, the operation of the vehicle air conditioner 1a of this embodiment with the above configuration will be described. The basic operation of the vehicle air conditioner 1a is the same as that of the first embodiment. Therefore, the vehicle air conditioner 1a of this embodiment can also switch between various operating modes, as in the first embodiment. Below, the operating modes that are different from those of the first embodiment will be described in detail.

[0334] (c-2) Large independent cooling mode In the heat medium circuit 30 in the large single cooling mode, the control device 70 controls the operation of the heat medium mixing valve 40 so as to connect the outlet side of the second heat medium three-way joint 33b to one inlet side of the fourth heat medium three-way joint 33d, and at the same time connect one outlet side of the first high-temperature side three-way valve 352a to the inlet side of the heat medium passage 16b of the main chiller 16. Furthermore, the control device 70 controls the operation of the other various components, as in the large single cooling mode of the first embodiment.

[0335] Therefore, the main refrigeration cycle 10 and the sub refrigeration cycle 20 operate in the same manner as in the first embodiment.

[0336] Furthermore, the heat medium circulates in the heat medium circuit 30 as shown by the dashed arrows in Fig. 16. In this embodiment, unlike the first embodiment, the heat medium flowing out from the first high-temperature side three-way valve 352a to the heat medium mixing valve 40 flows into the low-temperature side heat medium circuit 301 via the heat medium mixing valve 40. The heat medium flowing from the heat medium mixing valve 40 into the low-temperature side heat medium circuit 301 flows into the heat medium passage 26b of the sub-chiller 26 via the heat medium passage 16b of the main chiller 16 and is cooled.

[0337] The heat medium cooled in the heat medium passage 26b of the sub-chiller 26 is drawn into the low-temperature side pump 311. The heat medium pumped from the low-temperature side pump 311 flows into the high-temperature side heat medium circuit 302 via the heat medium bypass passage 371 and the heat medium mixing valve 40. The heat medium that flows from the heat medium mixing valve 40 into the high-temperature side heat medium circuit 302 flows out from one inlet side of the fourth heat medium three-way joint 33d of the high-temperature side heat medium circuit 302.

[0338] At the fourth heat medium three-way joint 33d, the flow of the heat medium flowing out from the heat medium mixing valve 40 and the flow of the heat medium flowing out from the high-temperature side passage 36a of the high-low temperature heat exchanger 36 join together. The heat medium flowing out from the fourth heat medium three-way joint 33d is drawn into the high-temperature side main pump 312a. Other operations are the same as those of the first embodiment.

[0339] As described above, in the large-capacity single cooling mode of this embodiment, the heat medium mixing valve 40 transfers the heat of the heat medium circulating in the high-temperature side heat medium circuit 302 to the heat medium circulating in the low-temperature side heat medium circuit 301. Therefore, in the large-capacity single cooling mode, as in the first embodiment, the cooling capacities of both the main refrigeration cycle 10 and the sub refrigeration cycle 20 can be used to cool the blown air.

[0340] (f-1) Normal warm-up mode In the heat medium circuit 30 in the normal warm-up mode, the control device 70 controls the operation of the heat medium mixing valve 40, as in the large single cooling mode. Furthermore, the control device 70 controls the operation of the other various components, as in the normal warm-up mode of the first embodiment.

[0341] Therefore, the heat medium circulates in the heat medium circuit 30 as shown by the dashed arrows in Fig. 17. In this embodiment, unlike the first embodiment, the heat medium that flows out from the first high-temperature side three-way valve 352a to the heat medium mixing valve 40 flows into the low-temperature side heat medium circuit 301 via the heat medium mixing valve 40.

[0342] The heat medium that flows from the heat medium mixing valve 40 into the low-temperature side heat medium circuit 301 passes through the heat medium passage 16 b of the main chiller 16 and the heat medium passage 26 b of the sub-chiller 26 , and is sucked into the low-temperature side pump 311 .

[0343] As in the first embodiment, the heat medium pumped from the low-temperature side pump 311 dissipates heat when it flows through the coolant passage 80a of the battery 80 via the first low-temperature side three-way valve 351a and the second low-temperature side three-way valve 351b. This heats the battery 80. That is, the battery 80 is warmed up.

[0344] The heat medium that has flowed out of the coolant passage 80a of the battery 80 flows into the high-temperature side heat medium circuit 302 via the heat medium mixing valve 40. The heat medium that has flowed into the high-temperature side heat medium circuit 302 from the heat medium mixing valve 40 flows into one inlet of the heat medium four-way joint 33x. Other operations are the same as those in the first embodiment.

[0345] As described above, in the normal warm-up mode of this embodiment, the heat medium mixing valve 40 can transfer the heat of the heat medium circulating in the high-temperature side heat medium circuit 302 to the heat medium circulating in the low-temperature side heat medium circuit 301. Therefore, in the normal warm-up mode, as in the first embodiment, the heat of the heat medium heated by the electric heater 39 can be used as a heat source for warming up the battery 80.

[0346] (f-2) Large warm-up mode In the heat medium circuit 30 in the large warm-up mode, the control device 70 controls the operation of the heat medium mixing valve 40, as in the normal warm-up mode. Furthermore, the control device 70 controls the operation of the other various components, as in the large warm-up mode of the first embodiment.

[0347] Therefore, the secondary refrigeration cycle 20 operates in the same manner as in the first embodiment. In addition, in the heat medium circuit 30 of this embodiment, the heat medium circulates as shown by the dashed arrows in Fig. 18. In this embodiment, unlike the first embodiment, the heat medium that flows out from the first high-temperature side three-way valve 352a to the heat medium mixing valve 40 side flows into the low-temperature side heat medium circuit 301 via the heat medium mixing valve 40.

[0348] The heat medium that has flowed from the heat medium mixing valve 40 into the low-temperature side heat medium circuit 301 dissipates heat while flowing through the coolant passage 80a of the battery 80, as in the normal warm-up mode. This heats up the battery 80. That is, the battery 80 is warmed up.

[0349] The heat medium that has flowed out of the coolant passage 80a of the battery 80 flows into the high-temperature side heat medium circuit 302 via the heat medium mixing valve 40. The heat medium that has flowed into the high-temperature side heat medium circuit 302 flows into one inlet of the heat medium four-way joint 33x. Other operations are the same as those in the first embodiment.

[0350] As described above, in the large warm-up mode of the present embodiment, the heat medium mixing valve 40 transfers the heat of the heat medium circulating in the high-temperature side heat medium circuit 302 to the heat medium circulating in the low-temperature side heat medium circuit 301. Therefore, in the large warm-up mode, as in the first embodiment, the heat of the heat medium heated by the sub refrigeration cycle 20 and the electric heater 39 can be used as a heat source for warming up the battery 80.

[0351] In other operation modes, the control device 70 controls the operation of the heat medium mixing valve 40 so as to connect the outlet side of the second heat medium three-way joint 33b to the inlet side of the heat medium passage 16b of the main chiller 16, and at the same time connect one outlet side of the first high-temperature side three-way valve 352a to one inlet side of the fourth heat medium three-way joint 33d. In addition, the control device 70 controls the operation of various component devices, as in the first embodiment.

[0352] Therefore, in other operation modes, the air conditioner 1a operates in exactly the same way as in the first embodiment. Therefore, the vehicle air conditioner 1a of this embodiment can also achieve the same effects as in the first embodiment. That is, by utilizing the temperature adjustment capabilities of the main refrigeration cycle 10 and the sub refrigeration cycle 20, the temperatures of multiple temperature adjustment objects such as the blown air or the battery 80 can be efficiently adjusted.

[0353] (Third embodiment) In this embodiment, as shown in the overall configuration diagrams of Figures 19 to 22, an example will be described in which the circuit configuration of the high-temperature side heat medium circuit 302 is changed from the vehicle air conditioner 1 of the first embodiment. Specifically, in the vehicle air conditioner 1b of this embodiment, the third heat medium three-way joint 33c is eliminated and a sixth heat medium three-way joint 33f and a heat medium check valve 41 are added. In addition, the location of the electric heater 39 is changed.

[0354] One inlet of the sixth heat medium three-way joint 33f is connected to the other outlet side of the heat medium four-way joint 33x. One inlet of the sixth heat medium three-way joint 33f is connected to one outlet side of the third high-temperature side three-way valve 352c. The outlet of the sixth heat medium three-way joint 33f is connected to the suction port side of the main high-temperature side pump 312a.

[0355] The heat medium check valve 41 is disposed in the heat medium flow path from the other outlet of the heat medium four-way joint 33x to one inlet of the sixth heat medium three-way joint 33f. The heat medium check valve 41 allows the heat medium to flow from the heat medium four-way joint 33x side to the sixth heat medium three-way joint 33f side, but prohibits the heat medium from flowing from the sixth heat medium three-way joint 33f side to the heat medium four-way joint 33x side.

[0356] The electric heater 39 is disposed in a heat medium flow path extending from the discharge port of the main high-temperature side pump 312a to the inlet of the main high-temperature side pump 352a. The rest of the configuration of the vehicle air conditioner 1b is the same as that of the vehicle air conditioner 1 described in the first embodiment.

[0357] Next, the operation of the vehicle air conditioner 1b of this embodiment with the above configuration will be described. The basic operation of the vehicle air conditioner 1b is the same as that of the first embodiment. Therefore, the vehicle air conditioner 1b of this embodiment can also switch between various operating modes, as in the first embodiment. Below, the operating modes that are different from those of the first embodiment will be described in detail.

[0358] (b-2) Large independent heating mode In the large single heating mode, the control device 70 controls the operation of the various components in the same manner as in the first embodiment.

[0359] Therefore, the heat medium circulates in the heat medium circuit 30 as shown by the dashed arrows in Fig. 19. In this embodiment, unlike the first embodiment, the heat medium pumped from the sub-high temperature side pump 312b flows into the heat medium passage 22b of the sub-water-refrigerant heat exchanger 22 and is heated. The heat medium heated in the sub-water-refrigerant heat exchanger 22 is drawn into the main high temperature side pump 312a via the third high temperature side three-way valve 352c and the sixth heat medium three-way joint 33f.

[0360] The heat medium pumped from the main warm-side pump 312a flows into the heat medium passage 12b of the main water-refrigerant heat exchanger 12 and is further heated. The heat medium heated in the main water-refrigerant heat exchanger 12 flows into the heater core 38 via the first warm-side three-way valve 352a and the second warm-side three-way valve 352b. That is, in this embodiment, the heat medium passage 12b of the main water-refrigerant heat exchanger 12 and the heat medium passage 22b of the secondary water-refrigerant heat exchanger 22 are connected in series with respect to the heat medium flow. Other operations are the same as those in the first embodiment.

[0361] Therefore, in the large single heating mode, as in the first embodiment, the heating capacity of both the main refrigeration cycle 10 and the sub-refrigeration cycle 20 can be utilized to heat the vehicle interior with a heating capacity higher than that in the single heating mode.

[0362] (e-2) Large dehumidification heating mode In the large single heating mode, the control device 70 controls the operation of the various components in the same manner as in the first embodiment. In the heat medium circuit 30, the heat medium circulates as shown by the dashed arrows in Figure 20, in the same manner as in the large single heating mode. Other operations are the same as in the first embodiment.

[0363] Therefore, in the large single heating mode, as in the first embodiment, the heating capacity of both the main refrigeration cycle 10 and the sub-refrigeration cycle 20 can be utilized to reheat the blown air with a heating capacity higher than that in the normal dehumidification heating mode.

[0364] (f-1) Normal warm-up mode In the normal warm-up mode, the control device 70 controls the operation of the first high-temperature-side three-way valve 352a so that the entire flow rate of the heat medium that has flowed inside flows out to the high-low-temperature heat exchanger 36, unlike the first embodiment. Also, the control device 70 controls the operation of the various components, similarly to the first embodiment.

[0365] In the heat medium circuit 30, the heat medium circulates as shown by the dashed arrows in Fig. 21. That is, the heat medium pumped from the main high-temperature side pump 312a circulates through the heat medium passage 12b of the main water-refrigerant heat exchanger 12, the high-temperature side passage 36a of the high-low temperature heat exchanger 36, and the suction port of the main high-temperature side pump 312a, in that order. The heat medium flowing out of the heat medium passage 12b of the main water-refrigerant heat exchanger 12 is heated by the electric heater 39. Other operations are the same as those in the first embodiment.

[0366] Therefore, in the normal warm-up mode, the heat of the heat medium heated by the electric heater 39 can be used as a heat source for warming up the battery 80, similarly to the first embodiment.

[0367] (f-2) Large warm-up mode In the large warm-up mode, the control device 70 controls the operation of the various components in the same manner as in the first embodiment.

[0368] In the heat medium circuit 30, the heat medium circulates as shown by the dashed arrows in Fig. 22. That is, the heat medium pumped by the sub-high temperature side pump 312b flows through the heat medium passage 22b of the sub-water-refrigerant heat exchanger 22 and the suction port of the main high temperature side pump 312a, in that order. The heat medium pumped by the main high temperature side pump 312a flows through the heat medium passage 12b of the main water-refrigerant heat exchanger 12, the high temperature side passage 36a of the high-low temperature heat exchanger 36, and the suction port of the sub-high temperature side pump 312b, in that order.

[0369] The heat medium heated in the secondary water-refrigerant heat exchanger 22 is further heated by the electric heater 39. Other operations are the same as those in the first embodiment.

[0370] Therefore, in the large warm-up mode, as in the first embodiment, not only the heat of the heat medium heated by the electric heater 39 but also the heat of the heat medium heated in the secondary refrigeration cycle 20 can be used as a heat source for warming up the battery 80.

[0371] In the other operation modes, the control device 70 controls the operation of the various components in the same manner as in the first embodiment. Therefore, in the other operation modes, the air conditioner 1a for a vehicle according to this embodiment operates in exactly the same manner as in the first embodiment. Therefore, the same effects as in the first embodiment can be obtained with the air conditioner 1a for a vehicle according to this embodiment. That is, by utilizing the temperature adjustment capabilities of the main refrigeration cycle 10 and the sub refrigeration cycle 20, the temperatures of multiple temperature adjustment targets, such as the blown air or the battery 80, can be efficiently adjusted.

[0372] (Other embodiments) The present invention is not limited to the above-described embodiment, and various modifications can be made as follows without departing from the spirit of the present invention.

[0373] (1) In the above embodiment, an example was described in which the refrigeration cycle device according to the present invention was applied to a vehicle air conditioner. However, the application of the refrigeration cycle device is not limited to a vehicle air conditioner.

[0374] For example, the refrigeration cycle device according to the present invention may be applied to a hot water supply device that adjusts the temperature of domestic water as a first temperature adjustment object while adjusting the temperature of another heat-generating device as a second temperature adjustment object. Also, the refrigeration cycle device according to the present invention may be applied to an air conditioner with a server temperature adjustment function that adjusts the temperature of blown air as a first temperature adjustment object while adjusting the temperature of a computer server as a second temperature adjustment object.

[0375] Furthermore, when the refrigeration cycle device of the present invention is applied to a vehicle air conditioning system, the second temperature adjustment object may be a motor generator, an inverter, a sensor processing unit, a transaxle, an ADAS control device, etc.

[0376] A motor generator is an electric motor that functions as both a motor that outputs driving force for driving and a generator. An inverter is an electric circuit device that supplies power to the motor generator, etc. A sensor processing unit is a control device that integrates environmental sensor interfaces and communication functions for autonomous driving and energy-saving driving. A transaxle is a power transmission mechanism that integrates the transmission, differential gear, etc. An ADAS control device is a control device for advanced driver assistance systems.

[0377] (2) The configuration of the refrigeration cycle device according to the present invention is not limited to the configuration disclosed in the above-described embodiment.

[0378] For example, in the above embodiment, the main refrigeration cycle 10 includes a receiver portion that is a gas-liquid separator on the high pressure side, constituting a so-called receiver cycle. However, the present invention is not limited to this. The main refrigeration cycle 10 may include an accumulator that is a gas-liquid separator on the low pressure side, constituting a so-called accumulator cycle.

[0379] The accumulator is a low-pressure side gas-liquid separator that separates the main refrigerant sucked into the main compressor 11 into gas and liquid. The accumulator stores the separated liquid-phase refrigerant as surplus refrigerant in the cycle and discharges the separated gas-phase refrigerant to the suction port side of the main compressor 11. In the main refrigeration cycle 10 equipped with an accumulator, the operation of the cooling expansion valve 14a and the cooling expansion valve 14b may be controlled so that the coefficient of performance of the main refrigeration cycle 10 approaches a local maximum value.

[0380] Similarly, the secondary refrigeration cycle 20 may be provided with an accumulator to constitute an accumulator cycle. In the secondary refrigeration cycle 20 provided with an accumulator, the operation of the secondary expansion valve 24 may be controlled so that the coefficient of performance of the secondary refrigeration cycle 20 approaches a maximum value in each operation mode.

[0381] Furthermore, the main refrigeration cycle 10 and the sub refrigeration cycle 20 may be a so-called gas injection cycle in which the refrigerant is compressed in multiple stages to increase the pressure.

[0382] The main refrigeration cycle 10 may also include a main internal heat exchanger that exchanges heat between the high-pressure main refrigerant flowing out of the main water-refrigerant heat exchanger 12 and the low-pressure main refrigerant drawn into the main compressor 11. Similarly, the secondary refrigeration cycle 20 may also include a secondary internal heat exchanger that exchanges heat between the high-pressure secondary refrigerant flowing out of the secondary water-refrigerant heat exchanger 22 and the low-pressure secondary refrigerant drawn into the secondary compressor 21.

[0383] In the above embodiment, the heat medium passage 16b of the main chiller 16 and the heat medium passage 26b of the sub-chiller 26 are connected in series with respect to the heat medium flow in the low-temperature side heat medium circuit 301. However, the present invention is not limited to this. In the low-temperature side heat medium circuit 301, the heat medium passage 16b of the main chiller 16 and the heat medium passage 26b of the sub-chiller 26 may be connected in parallel with respect to the heat medium flow.

[0384] In the above embodiment, the secondary refrigeration cycle constitutes a hot gas cycle in the large warm-up mode, but this is not limiting. For example, in the large warm-up mode, the low-temperature side heat medium circuit 301 may be configured to be switchable to a circuit configuration in which the heat medium circulates only between the heat medium passage 26b of the sub-chiller 26 and the low-temperature side outside air heat exchanger 321, and the secondary refrigeration cycle 20 may be operated in the same manner as in the large single heating mode, etc.

[0385] According to this, in the low-temperature side outside air heat exchanger 321, the heat of the outside air can be absorbed by the heat medium circulating through the low-temperature side heat medium circuit 301. In the sub-chiller 26, the heat absorbed by the heat medium from the outside air can be absorbed by the secondary refrigerant. Then, in the secondary water-refrigerant heat exchanger 22, the heat absorbed by the secondary refrigerant from the heat medium can be used as a heat source to heat the heat medium circulating through the high-temperature side heat medium circuit 301.

[0386] In the above embodiment, the low-temperature side outdoor air heat exchanger 321, which is a low-temperature side outdoor air heat exchanger, and the high-temperature side main outdoor air heat exchanger 322a and the high-temperature side auxiliary outdoor air heat exchanger 322b, which are high-temperature side outdoor air heat exchangers, are used as outdoor air heat exchangers. However, the present invention is not limited to this. For example, the circuit configuration of the heat medium circuit 30 may be changed so that the low-temperature side outdoor air heat exchanger 321 and the high-temperature side main outdoor air heat exchanger 322a are configured as a common heat exchanger. Similarly, the low-temperature side outdoor air heat exchanger 321 and the high-temperature side auxiliary outdoor air heat exchanger 322b may be configured as a common heat exchanger.

[0387] Furthermore, the group of control sensors connected to the input side of the control device 70 is not limited to the detection units disclosed in the above embodiment, and various detection units may be added as necessary.

[0388] In the above embodiment, the refrigerant used in the main refrigeration cycle 10 and the sub refrigeration cycle 20 is R1234yf, but this is not limiting. For example, R134a, R600a, R410A, R404A, R32, R407C, R290, R744, or a mixture of these refrigerants may be used. When R744 is used, a supercritical refrigeration cycle may be configured in which the pressure of the high-pressure side refrigerant exceeds the critical pressure of the refrigerant.

[0389] In the above embodiment, an example in which an ethylene glycol aqueous solution is used as the heat medium is described, but the present invention is not limited to this. For example, a solution containing dimethylpolysiloxane or nanofluid, an antifreeze, an aqueous liquid refrigerant containing alcohol, or a liquid medium containing oil may be used.

[0390] (3) The control aspects of the refrigeration cycle device according to the present invention are not limited to those disclosed in the above-described embodiments. For example, the refrigeration cycle device according to the present invention may be capable of implementing other operating modes. Furthermore, as long as it is capable of implementing at least the single cooling mode and the large single cooling mode, it is not necessarily required that other operating modes be implemented.

[0391] In addition, in the high-cooling cooling mode, an example has been described in which the control manner of the various components of the main refrigeration cycle 10 and the various components of the sub refrigeration cycle 20 is changed depending on the cooling capacity of the battery 80, but this is not limited to this.

[0392] For example, when it is determined that the cooling capacity of the battery 80 is insufficient, the operation of at least one of the components of the main refrigeration cycle 10 and the secondary refrigeration cycle 20 may be controlled so that the equipment-side heat medium temperature TWB falls below the reference equipment-side temperature KTWB.

[0393] For example, the airflow rate of the indoor blower 62 of the indoor air conditioning unit 60 may be changed depending on the cooling capacity of the battery 80 so that the temperature of the blown air approaches the target first main evaporator-side refrigerant temperature TEO1 or so that the battery temperature TB approaches the target equipment-side temperature TBO. Similarly, the opening degree of the air mix door 64 may be changed. Similarly, the heat medium pumping rate of the low-temperature side pump 311 may be changed.

[0394] (4) The means disclosed in each of the above-described embodiments may be combined as appropriate within the scope of feasibility.

[0395] For example, in the high-temperature side heat medium circuit 302 of the first and second embodiments, the location of the electric heater 39 may be changed, as in the third embodiment. In this case, the operation of the various components of the high-temperature side heat medium circuit 302 may be controlled in the large dehumidification heating mode, normal warm-up mode, and large warm-up mode of the first and second embodiments, as in the third embodiment. Of course, the electric heater 39 may be located elsewhere as long as it is possible to heat the heat medium flowing into the heater core 38.

[0396] For example, in the third embodiment, the heat transfer unit may be a heat medium mixing valve 40. In this case, the operation of the heat medium mixing valve 40 may be controlled in the large single cooling mode, normal warm-up mode, and large warm-up mode of the third embodiment, similarly to the second embodiment.

[0397] The refrigeration cycle device disclosed in this specification has the following features. (Item 1) a main refrigeration cycle (10) for adjusting the temperature of a first temperature adjustment object and adjusting the temperature of a heat medium; a secondary refrigeration cycle (20) for adjusting the temperature of the heat medium; a heat medium circuit (30) for circulating the heat medium, The main refrigeration cycle includes a main compression section (11) that compresses and discharges a main refrigerant, a heating section (12, 38) that heats the first temperature-adjustment object using the main refrigerant discharged from the main compression section as a heat source, a branch section (13a) that branches a flow of the main refrigerant flowing out from the heating section, a first main pressure reduction section (14a) that reduces the pressure of one of the main refrigerants branched at the branch section, a first main evaporation section (15) that evaporates the main refrigerant reduced in pressure at the first main pressure reduction section by heat exchange with the first temperature-adjustment object, a second main pressure reduction section (14b) that reduces the pressure of the other main refrigerant branched at the branch section, and a second main evaporation section (16) that evaporates the main refrigerant reduced in pressure at the second main pressure reduction section by heat exchange with the heat medium, The secondary refrigeration cycle includes a secondary compression section (21) that compresses and discharges a secondary refrigerant, a secondary heat dissipation section (22) that dissipates heat from the secondary refrigerant discharged from the secondary compression section, a secondary pressure reduction section (24) that reduces the pressure of the secondary refrigerant that flows out from the secondary heat dissipation section, and a secondary evaporation section (26) that evaporates the secondary refrigerant reduced in pressure by the secondary pressure reduction section through heat exchange with the heat medium, the heat medium circuit includes a low-temperature side heat medium circuit (301) in which a heat medium passage (16b) of the second main evaporation section, a heat medium passage (22b) of the sub-evaporation section, and a second temperature adjustment heat exchange section (80a) that exchanges heat between the heat medium and a second temperature-adjustment object (80) are arranged, The operation mode for cooling the second temperature adjustment object includes a second object normal cooling mode and a second object large cooling mode, In the second object normal cooling mode, the main compression unit is stopped, the sub-compression unit is operated, and the heat medium cooled in the sub-evaporation unit is caused to flow into the second temperature control heat exchange unit, In the second object large cooling mode, the main compression unit is operated to cause the main refrigerant to flow into the second main evaporation unit, and the sub-compression unit is operated to cause the heat medium cooled in the second main evaporation unit and the heat medium cooled in the sub-evaporation unit to flow into the second temperature control heat exchange unit. (Item 2) the heating unit includes a main heat medium refrigerant heat exchange unit (12) for exchanging heat between the main refrigerant and the heat medium, and a heating heat exchange unit (38) for exchanging heat between the heat medium and the first temperature adjustment object, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and a heat medium passage of the heating heat exchange section are arranged, a low-temperature side outside air heat exchanger (321) for exchanging heat between the heat medium and outside air is disposed in the low-temperature side heat medium circuit; The operation modes for heating the first temperature adjustment object include a first object normal heating mode and a first object large heating mode, In the first object normal heating mode, the main compression unit is operated, the main refrigerant is caused to flow into the second main evaporation unit, the sub-compression unit is stopped, the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the heating heat exchange unit, and the heat medium cooled in the second main evaporation unit is caused to flow into the low-temperature side outside air heat exchange unit, Item 1. The refrigeration cycle apparatus according to item 1, wherein in the first object-large heating mode, the main compression unit is operated to cause the main refrigerant to flow into the second main evaporation unit, the sub-compression unit is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the sub-heat medium refrigerant heat exchange unit to flow into the heating heat exchange unit, and the heat medium cooled in the second main evaporation unit and the heat medium cooled in the sub-evaporation unit to flow into the low-temperature side outside air heat exchange unit. (Item 3) the high-temperature side heat medium circuit includes a heat medium junction (33c) that joins a flow of the heat medium flowing out of a heat medium passage in the main heat medium refrigerant heat exchange section and a flow of the heat medium flowing out of a heat medium passage in the auxiliary heat medium refrigerant heat exchange section, 3. The refrigeration cycle device according to item 2, further comprising a heating heat medium temperature detection section (73d) that detects the temperature of the heat medium in the heat medium flow path from the heat medium junction section to the heat medium inlet of the heating heat exchange section. (Item 4) the heating section has a main heat medium refrigerant heat exchange section (12) that exchanges heat between the main refrigerant and the heat medium, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and high-temperature side outside air heat exchange sections (322a, 322b) that exchange heat between the heat medium and outside air are arranged, and heat transfer sections (36, 40) that transfer heat between the heat medium circulating in the high-temperature side heat medium circuit and the heat medium circulating in the low-temperature side heat medium circuit, The operation mode for cooling the first temperature adjustment object includes a first object normal cooling mode and a first object large cooling mode, In the first object normal cooling mode, the main compression unit is operated, the main refrigerant is caused to flow into the first main evaporation unit, the sub-compression unit is stopped, and the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the high-temperature side outside air heat exchange unit, 4. The refrigeration cycle apparatus according to any one of items 1 to 3, wherein in the first object large cooling mode, the main compression unit is operated to cause the main refrigerant to flow into the first main evaporation unit, the sub-compression unit is operated, the heat transfer unit transfers heat of the heat medium circulating in the high-temperature side heat medium circuit to the heat medium circulating in the low-temperature side heat medium circuit, and the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the sub-heat medium refrigerant heat exchange unit are caused to flow into the high-temperature side outside air heat exchange unit. (Item 5) the heating section has a main heat medium refrigerant heat exchange section (12) that exchanges heat between the main refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium-refrigerant heat exchange unit and a high-temperature side outside air heat exchange unit (322a, 322b) that exchanges heat between the heat medium and outside air are arranged, The operating modes for cooling both the first temperature adjustment object and the second temperature adjustment object include a composite object normal cooling mode and a composite object large cooling mode, In the composite object normal cooling mode, the main compression unit is operated, the main refrigerant is caused to flow into both the first main evaporation unit and the second main evaporation unit, the sub-compression unit is stopped, the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the high-temperature side outside air heat exchange unit, and the heat medium cooled in the second main evaporation unit is caused to flow into the second temperature adjustment heat exchange unit, 5. The refrigeration cycle apparatus according to any one of items 1 to 4, wherein in the composite object large cooling mode, the main compression unit is operated to cause the main refrigerant to flow into both the first main evaporator unit and the second main evaporator unit, the sub-compressor is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange unit to flow into the high-temperature side outside air heat exchange unit, and the heat medium cooled in the second main evaporator unit and the heat medium cooled in the sub-evaporator unit to flow into the second temperature control heat exchange unit. (Item 6) When the composite object large cooling mode is being executed and the cooling capacity of the second temperature adjustment object is not insufficient, the temperature of the first temperature adjustment object is brought closer to a target first object temperature (TEO1); Item 6. The refrigeration cycle apparatus according to item 5, wherein when the composite object large cooling mode is being executed and the cooling capacity of the second temperature adjustment object is insufficient, the temperature of the second temperature adjustment object is brought closer to a target second object temperature (TBO). (Item 7) the heating unit includes a main heat medium refrigerant heat exchange unit (12) for exchanging heat between the main refrigerant and the heat medium, and a heating heat exchange unit (38) for exchanging heat between the heat medium and the first temperature adjustment object, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and a heat medium passage of the heating heat exchange section are arranged, and a low-temperature side outside air heat exchange section (321) that exchanges heat between the heat medium and outside air, The first temperature adjustment object is cooled in the first main evaporator and reheated in the heating heat exchanger, and the first object normal reheating mode and the first object large reheating mode are included as operation modes in which the first temperature adjustment object is cooled in the first main evaporator and reheated in the heating heat exchanger. In the first object normal reheating mode, the main compression unit is operated, the main refrigerant is caused to flow into the first main evaporation unit, the sub-compression unit is stopped, and the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the heating heat exchange unit, 7. The refrigeration cycle apparatus according to any one of items 1 to 6, wherein, in the first object-large reheating mode, the main compression unit is operated to cause the main refrigerant to flow into the first main evaporation unit, the sub-compression unit is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the sub-heat medium refrigerant heat exchange unit to flow into the heating heat exchange unit, and the heat medium cooled in the sub-evaporation unit to flow into the low-temperature side outside air heat exchange unit. (Item 8) the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section is arranged, and a heat transfer section (36, 40) that transfers heat between the heat medium circulating in the high-temperature side heat medium circuit and the heat medium circulating in the low-temperature side heat medium circuit, The operation mode for heating the second temperature adjustment object is a second object large heating mode, 8. The refrigeration cycle apparatus according to any one of items 1 to 7, wherein in the second large object heating mode, the main compression unit is stopped, the sub-compression unit is operated, the heat transfer unit transfers heat of the heat medium circulating in the high-temperature side heat medium circuit to the heat medium circulating in the low-temperature side heat medium circuit, and the heat medium flows into the second temperature control heat exchange unit. (Item 9) 9. The refrigeration cycle device according to any one of items 1 to 8, wherein in the low-temperature side heat medium circuit, the heat medium is circulated through the second main evaporator, the sub-evaporator, and the second temperature adjustment heat exchanger in this order. [Explanation of symbols]

[0398] 10, 20, 30 Main refrigeration cycle, secondary refrigeration cycle, heat medium circuit 11, 21 Main compressor (main compression section), sub-compressor (sub-compression section) 12 Main water-refrigerant heat exchanger (main heat medium refrigerant heat exchange section, heating section) 22 Sub-water refrigerant heat exchanger (sub-heat medium refrigerant heat exchange section, sub-heat radiation section) 14a, 14b Cooling expansion valve (first main pressure reducing section), cooling expansion valve (second main pressure reducing section) 15, 16 Indoor evaporator (first main evaporator), main chiller (second main evaporator) 24 Sub-expansion valve (sub-pressure reducing section) 26 Secondary chiller (secondary evaporation section) 321 Low-temperature side outdoor air heat exchanger (low-temperature side outdoor air heat exchanger section) 322a High-temperature side main outside air heat exchanger (high-temperature side outside air heat exchange section) 322b High-temperature side auxiliary outside air heat exchanger (high-temperature side outside air heat exchange section) 38 Heater core (heat exchange part for heating) 80a Cooling water passage (second temperature adjustment heat exchange section)

Claims

1. a main refrigeration cycle (10) for adjusting the temperature of a first temperature adjustment object and adjusting the temperature of a heat medium; a secondary refrigeration cycle (20) for adjusting the temperature of the heat medium; a heat medium circuit (30) for circulating the heat medium, The main refrigeration cycle includes a main compression section (11) that compresses and discharges a main refrigerant, a heating section (12, 38) that heats the first temperature-adjustment object using the main refrigerant discharged from the main compression section as a heat source, a branching section (13a) that branches a flow of the main refrigerant flowing out from the heating section, a first main pressure reduction section (14a) that reduces the pressure of one of the main refrigerants branched at the branching section, a first main evaporation section (15) that evaporates the main refrigerant reduced in pressure at the first main pressure reduction section by heat exchange with the first temperature-adjustment object, a second main pressure reduction section (14b) that reduces the pressure of the other of the main refrigerant branched at the branching section, and a second main evaporation section (16) that evaporates the main refrigerant reduced in pressure at the second main pressure reduction section by heat exchange with the heat medium, The secondary refrigeration cycle includes a secondary compression section (21) that compresses and discharges a secondary refrigerant, a secondary heat dissipation section (22) that dissipates heat from the secondary refrigerant discharged from the secondary compression section, a secondary pressure reduction section (24) that reduces the pressure of the secondary refrigerant flowing out from the secondary heat dissipation section, and a secondary evaporation section (26) that evaporates the secondary refrigerant decompressed in the secondary pressure reduction section by heat exchange with the heat medium, the heat medium circuit includes a low-temperature side heat medium circuit (301) in which a heat medium passage (16b) of the second main evaporator, a heat medium passage (22b) of the sub-evaporator, and a second temperature adjustment heat exchanger (80a) that exchanges heat between the heat medium and a second temperature adjustment object (80) are arranged, The operation mode for cooling the second temperature adjustment object includes a second object normal cooling mode and a second object large cooling mode, In the second object normal cooling mode, the main compression unit is stopped, the sub-compression unit is operated, and the heat medium cooled in the sub-evaporation unit is caused to flow into the second temperature control heat exchange unit, In the second object large cooling mode, the main compression section is operated to cause the main refrigerant to flow into the second main evaporation section, and the sub-compression section is operated to cause the heat medium cooled in the second main evaporation section and the heat medium cooled in the sub-evaporation section to flow into the second temperature control heat exchange section.

2. the heating unit has a main heat medium refrigerant heat exchange unit (12) that exchanges heat between the main refrigerant and the heat medium, and a heating heat exchange unit (38) that exchanges heat between the heat medium and the first temperature adjustment object, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and a heat medium passage of the heating heat exchange section are arranged, The low-temperature side heat medium circuit is provided with a low-temperature side outside air heat exchanger (321) for exchanging heat between the heat medium and outside air, The operation mode for heating the first temperature adjustment object includes a first object normal heating mode and a first object large heating mode, In the first object normal heating mode, the main compression unit is operated, the main refrigerant is caused to flow into the second main evaporation unit, the sub-compression unit is stopped, the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the heating heat exchange unit, and the heat medium cooled in the second main evaporation unit is caused to flow into the low-temperature side outside air heat exchange unit, 2. The refrigeration cycle apparatus according to claim 1, wherein, in the first large object heating mode, the main compression unit is operated to cause the main refrigerant to flow into the second main evaporation unit, the auxiliary compression unit is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the auxiliary heat medium refrigerant heat exchange unit to flow into the heating heat exchange unit, and the heat medium cooled in the second main evaporation unit and the heat medium cooled in the auxiliary evaporation unit to flow into the low-temperature side outside air heat exchange unit.

3. the high-temperature side heat medium circuit has a heat medium junction (33c) that joins the flow of the heat medium flowing out of the heat medium passage of the main heat medium refrigerant heat exchange section and the flow of the heat medium flowing out of the heat medium passage of the auxiliary heat medium refrigerant heat exchange section, The refrigeration cycle device according to claim 2, further comprising a heating heat medium temperature detection section (73d) that detects the temperature of the heat medium in the heat medium flow path from the heat medium junction section to the heat medium inlet of the heating heat exchange section.

4. The heating unit has a main heat medium refrigerant heat exchange unit (12) that exchanges heat between the main refrigerant and the heat medium, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and a high-temperature side outside air heat exchange section (322a, 322b) that exchanges heat between the heat medium and outside air are arranged, and a heat transfer section (36, 40) that transfers heat between the heat medium circulating in the high-temperature side heat medium circuit and the heat medium circulating in the low-temperature side heat medium circuit, The operation mode for cooling the first temperature adjustment object includes a first object normal cooling mode and a first object large cooling mode, In the first object normal cooling mode, the main compression unit is operated, the main refrigerant is caused to flow into the first main evaporation unit, the sub-compression unit is stopped, and the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the high-temperature side outside air heat exchange unit, 2. The refrigeration cycle apparatus according to claim 1, wherein, in the first large object cooling mode, the main compression unit is operated to cause the main refrigerant to flow into the first main evaporation unit, the sub-compression unit is operated, the heat transfer unit transfers heat of the heat medium circulating in the high-temperature side heat medium circuit to the heat medium circulating in the low-temperature side heat medium circuit, and the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the sub-heat medium refrigerant heat exchange unit are caused to flow into the high-temperature side outside air heat exchange unit.

5. The heating unit has a main heat medium refrigerant heat exchange unit (12) that exchanges heat between the main refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchanger and high-temperature side outside air heat exchanger (322a, 322b) that exchanges heat between the heat medium and outside air are arranged, The operating modes for cooling both the first temperature adjustment object and the second temperature adjustment object include a composite object normal cooling mode and a composite object large cooling mode, In the composite object normal cooling mode, the main compression unit is operated, the main refrigerant is caused to flow into both the first main evaporation unit and the second main evaporation unit, the sub-compression unit is stopped, the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the high-temperature side outside air heat exchange unit, and the heat medium cooled in the second main evaporation unit is caused to flow into the second temperature adjustment heat exchange unit, 2. The refrigeration cycle device according to claim 1, wherein in the composite object large cooling mode, the main compression section is operated to cause the main refrigerant to flow into both the first main evaporation section and the second main evaporation section, the auxiliary compression section is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange section to flow into the high-temperature side outside air heat exchange section, and the heat medium cooled in the second main evaporation section and the heat medium cooled in the auxiliary evaporation section to flow into the second temperature control heat exchange section.

6. When the composite object large cooling mode is being executed and the cooling capacity of the second temperature adjustment object is not insufficient, the temperature of the first temperature adjustment object is brought closer to a target first object temperature (TEO1); 6. The refrigeration cycle device according to claim 5, wherein when the composite object large cooling mode is being executed and the cooling capacity of the second temperature adjustment object is insufficient, the temperature of the second temperature adjustment object is brought closer to a target second object temperature (TBO).

7. the heating unit has a main heat medium refrigerant heat exchange unit (12) that exchanges heat between the main refrigerant and the heat medium, and a heating heat exchange unit (38) that exchanges heat between the heat medium and the first temperature adjustment object, the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (12b) of the main heat medium refrigerant heat exchange section, a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section, and a heat medium passage of the heating heat exchange section are arranged, and a low-temperature side outside air heat exchange section (321) that exchanges heat between the heat medium and outside air, The first temperature adjustment object is cooled in the first main evaporator and reheated in the heating heat exchanger, and the first object normal reheating mode and the first object large reheating mode are included as operation modes in which the first temperature adjustment object is cooled in the first main evaporator and reheated in the heating heat exchanger. In the first object normal reheating mode, the main compression unit is operated, the main refrigerant is caused to flow into the first main evaporation unit, the sub-compression unit is stopped, and the heat medium heated in the main heat medium refrigerant heat exchange unit is caused to flow into the heating heat exchange unit, 2. The refrigeration cycle device according to claim 1, wherein, in the first object-large reheating mode, the main compression unit is operated to cause the main refrigerant to flow into the first main evaporation unit, the auxiliary compression unit is operated to cause the heat medium heated in the main heat medium refrigerant heat exchange unit and the heat medium heated in the auxiliary heat medium refrigerant heat exchange unit to flow into the heating heat exchange unit, and the heat medium cooled in the auxiliary evaporation unit to flow into the low-temperature side outside air heat exchange unit.

8. the auxiliary heat dissipation section is an auxiliary heat medium refrigerant heat exchange section (22) that exchanges heat between the auxiliary refrigerant and the heat medium, the heat medium circuit includes a high-temperature side heat medium circuit (302) in which a heat medium passage (22b) of the auxiliary heat medium refrigerant heat exchange section is arranged, and a heat transfer section (36, 40) that transfers heat between the heat medium circulating in the high-temperature side heat medium circuit and the heat medium circulating in the low-temperature side heat medium circuit, The operation mode for heating the second temperature adjustment object is a second object large heating mode, 2. The refrigeration cycle device according to claim 1, wherein in the second large object heating mode, the main compression unit is stopped, the sub-compression unit is operated, the heat transfer unit transfers heat of the heat medium circulating in the high-temperature side heat medium circuit to the heat medium circulating in the low-temperature side heat medium circuit, and the heat medium is caused to flow into the second temperature control heat exchange unit.

9. 9. The refrigeration cycle device according to claim 1, wherein the low-temperature side heat medium circuit circulates the heat medium through the second main evaporator, the sub-evaporator, and the second temperature adjustment heat exchanger in this order.

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