Vehicle structure

Abstract

To provide a vehicle structure of an electric vehicle that can reduce power consumption during air-cooling.SOLUTION: A vehicle structure of an electric vehicle driven by a battery, comprises: an air-cooling circuit using a heat medium; an air-heating circuit that shares the heat medium with the air-cooling circuit; and a control part that controls the air-cooling circuit and the air-heating circuit. The air-cooling circuit comprises an outer capacitor, a fan, a compressor, and an evaporator. The air-heating circuit comprises the outer capacitor, the fan, and the compressor. The control part brings the evaporator into a supercooled state when the electric vehicle is decelerated during operation of the air-cooling circuit, and then operates the air-heating circuit while stopping the fan when the electric vehicle is stopped.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle structure for an electric vehicle powered by a battery. [Background technology]

[0002] Patent Document 1 discloses an air conditioning circuit for an electric vehicle. The air conditioning device includes a cooling circuit and a heating circuit. The cooling circuit includes an external condenser that exchanges heat with outside air, a fan that blows air to the external condenser, a compressor that compresses a heat medium, and an evaporator that exchanges heat with inside air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-93561 A Summary of the Invention [Problem to be solved by the invention]

[0004] In electric vehicles, the air conditioning circuit is driven only by power from the battery. When the air conditioning circuit consumes power from the battery, the driving range of the electric vehicle is shortened. Therefore, it is desirable to reduce the power consumption during air conditioning.

[0005] An object of the present invention is to provide a vehicle structure for an electric vehicle that can reduce power consumption during cooling. [Means for solving the problem]

[0006] A vehicle structure according to one aspect of the present invention includes: A vehicle structure of an electric vehicle driven by a battery, A heat pump type cooling circuit using a heat medium; a heat pump type heating circuit that shares the heat medium with the cooling circuit; A control unit that controls the cooling circuit and the heating circuit, The cooling circuit includes an external condenser that exchanges heat with outside air, a fan that blows air to the external condenser, a compressor that compresses the heat medium, and an evaporator. the heating circuit includes the external condenser, the fan, and the compressor that are shared with the cooling circuit; The control unit is When the cooling circuit is in operation and the electric vehicle is decelerating, the evaporator is placed in a supercooled state; Thereafter, when the electric vehicle stops, the heating circuit is operated with the fan stopped. Effect of the Invention

[0007] In the above vehicle structure, when the electric vehicle decelerates, the evaporator is put into a supercooled state, so that cold can be stored in the evaporator. Also, when the electric vehicle stops after decelerating, cold can be stored in the external condenser. By utilizing the low temperature stored in the evaporator and the external condenser, the load for operating the cooling circuit, such as the driving power of the fan and the driving power of the compressor, can be reduced. Therefore, the power consumption during cooling in the electric vehicle can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a vehicle structure according to an embodiment, illustrating a state in which a cooling circuit is driven. [Diagram 2] FIG. 2 is a schematic diagram of the vehicle structure described in the embodiment, illustrating a state in which the heating circuit is driven. [Diagram 3] FIG. 3 is a first flowchart illustrating a procedure for reducing power consumption during cooling by the vehicle structure described in the embodiment. [Figure 4] FIG. 4 is a second flowchart illustrating the procedure for reducing power consumption during cooling by the vehicle structure described in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An example of an embodiment of a vehicle structure according to the present invention will be described below with reference to the drawings. The sizes of the members shown in each drawing are expressed for the purpose of clarifying the description and do not necessarily represent the actual dimensions. Note that the present invention is not limited to the following examples, but is indicated by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0010] <Embodiment 1> 1 and 2 show an example of a vehicle structure 1 of an electric vehicle 100 driven by a battery. The electric vehicle 100 includes a BEV (Battery Electric Vehicle), a HEV (Hybrid Electric Vehicle), and a FCEV (Fuel Cell Electric Vehicle). An FCEV is a hydrogen vehicle equipped with a fuel cell that generates electricity from hydrogen.

[0011] The vehicle structure 1 of this example includes a heat pump circuit 2 that cools and heats the air inside the vehicle, and a control unit 4 that controls the heat pump circuit 2. The heat pump circuit 2 includes a cooling circuit 5 and a heating circuit 6. A part of the cooling circuit 5 and a part of the heating circuit 6 are shared. The vehicle structure 1 of this example further includes a heater-type heating circuit 3 that supplements the heating circuit 6 of the heat pump circuit 2. Each component of the vehicle structure 1 of this example will be described in detail below.

[0012] <Cooling circuit> FIG. 1 will be referred to in explaining the cooling circuit 5. In FIG. 1, the flow direction of the heat medium 8 flowing in the cooling circuit 5 is indicated by arrows. The open arrows indicate the flow of the high-temperature heat medium 8, the hatched arrows indicate the flow of the medium-temperature heat medium 8 (for example, between 30° C. and 50° C.), and the solid arrows indicate the flow of the low-temperature heat medium 8. The heat medium 8 is, for example, a heat medium such as hydrofluorocarbon. The heat medium 8 in the cooling circuit 5 functions as a refrigerant.

[0013] The cooling circuit 5 includes an external condenser 20 that exchanges heat with outside air. The cooling circuit 5 includes, in order from the external condenser 20 along the flow direction of the heat medium 8, an expansion valve 26, an evaporator 27, a compressor 22, and an internal condenser 23. Each component will be described along the flow direction of the heat medium 8.

[0014] More precisely, the external condenser 20 is a member that promotes heat exchange between the outside air and the heat medium 8. The external condenser 20 cools the vaporized heat medium 8 with the outside air to liquefy it. The external condenser 20 has a plurality of fins for increasing the contact area with the outside air. The external condenser 20 has a flow path for the heat medium 8 inside. The high-temperature heat medium 8 that flows into the external condenser 20 releases heat to the outside air in the external condenser 20. As a result, the temperature of the heat medium 8 discharged from the external condenser 20 becomes lower than the temperature of the heat medium 8 that flows into the external condenser 20. A temperature sensor 41 that measures the temperature of the heat medium 8 discharged from the external condenser 20 is disposed downstream of the external condenser 20. Information from the temperature sensor 41 is output to the control unit 4, which will be described later, and is used to control the cooling circuit 5.

[0015] The external condenser 20 is disposed on the rear side of the radiator 10. The radiator 10 is a heat exchanger that dissipates heat from a motor (not shown) and the like to the outside of the vehicle. The cooling circuit including the radiator 10 is not shown. The radiator 10 is disposed on the rear side of the grille shutter 12. When the grille shutter 12 is opened, the radiator 10 is exposed to the wind generated by the vehicle's travel. The wind generated by the vehicle's travel that has passed through the radiator 10 is exposed to the external condenser 20, where heat exchange of the heat medium 8 is performed. Furthermore, a fan 11 is disposed on the rear side of the external condenser 20. When the fan 11 rotates, the outside air can be applied to the radiator 10 and the external condenser 20 even when the electric vehicle 100 is traveling at a low speed or is stopped. In this example, the fan 11 is also considered to be a part of the cooling circuit 5.

[0016] Downstream of the temperature sensor 41, the flow path of the heat medium 8 branches. At the branch point, the flow path toward the lower side of the paper surface heads toward the expansion valve 26. A solenoid valve 21 is disposed in the flow path toward the right side of the paper surface at the branch point. During cooling, the solenoid valve 21 is closed, and the heat medium 8 discharged from the external condenser 20 heads toward the expansion valve 26.

[0017] The expansion valve 26 diffuses and expands the heat medium 8. The expansion valve 26 in this example is an electromagnetic valve with an adjustable throttle opening. The temperature of the diffused and expanded heat medium 8 drops rapidly. The temperature of the diffused and expanded heat medium 8 can be changed by adjusting the throttle amount of the expansion valve 26. A temperature sensor 42 is disposed downstream of the expansion valve 26. Information from the temperature sensor 42 is output to the control unit 4 and used to control the cooling circuit 5.

[0018] The heat medium 8 that has diffused and expanded flows into the evaporator 27. The evaporator 27 is a heat exchanger arranged inside the casing 2A of the HVAC (Heating Ventilation & Air Conditioning) unit. The evaporator 27 vaporizes the heat medium 8 that has been atomized by expansion due to reduced pressure. The structure of the evaporator 27 is almost the same as that of the external condenser 20 in that it has a flow passage and multiple fins. The HVAC unit is a member that integrates air conditioning functions, and a heater core 32 (described later) is also arranged inside the casing 2A. The casing 2A has an inlet 2B that takes in outside air or inside air, and an outlet 2C that connects to a duct for air-conditioning air inside the vehicle.

[0019] An air mix door 28 and a blower 29 are disposed inside the casing 2A. The air mix door 28 is disposed so as to be able to swing or slide freely, and adjusts the mixing ratio of the cold air from the evaporator 27 and the hot air from the heater core 32 described later. During cooling, the surface of the heater core 32 facing the evaporator 27 is shielded by the air mix door 28, so that the cold air that has passed through the evaporator 27 is prevented from passing through the heater core 32. In this case, the cold air is introduced into the vehicle from the outlet 2C without being heated by the heater core 32 at all. The blower 29 is disposed between the inlet 2B and the evaporator 27, and draws in outside air or inside air from the inlet 2B.

[0020] The medium-temperature heat medium 8 discharged from the evaporator 27 flows toward the solenoid valve 21. During cooling, the solenoid valve 21 is closed, so the heat medium 8 flows toward the compressor 22. A temperature sensor 43 is disposed downstream of the evaporator 27. Information from the temperature sensor 43 is output to the control unit 4 and used to control the cooling circuit 5.

[0021] An accumulator 25 is disposed upstream of the compressor 22. The accumulator 25 is a device that separates an excess of the liquid heat medium 8 in the heat pump circuit 2. By separating the excess of the liquid heat medium 8 by the accumulator 25, damage to the compressor 22 is suppressed.

[0022] The compressor 22 is a device that compresses the heat medium 8. The temperature of the heat medium 8 compressed by the compressor 22 increases. The heat medium 8 discharged from the compressor 22 flows into the internal condenser 23. A temperature sensor 44 is disposed between the compressor 22 and the internal condenser 23. Information from the temperature sensor 44 is output to the control unit 4 and used to control the cooling circuit 5.

[0023] The internal condenser 23 is a heat exchanger that heats the conditioned air with the heat of the heat medium 8. The structure of the internal condenser 23 is almost the same as that of the external condenser 20. In this example, the internal condenser 23 is provided so as to be in contact with the second internal condenser 30 of the heater-type heating circuit 3 described later. Therefore, the heat of the internal condenser 23 is transferred to the second internal condenser 30. During cooling, the circulation of the heat medium 9 of the heater-type heating circuit 3 is stopped, so the heat of the second internal condenser 30 does not actively heat the heater core 32 in the HVAC. The temperature of the heat medium 8 discharged from the internal condenser 23 drops.

[0024] The heat medium 8 discharged from the internal condenser 23 flows toward the external condenser 20. A temperature sensor 45, a pressure sensor 47, and an expansion valve 24 are arranged in this order in the flow direction of the heat medium 8 in the piping connecting the internal condenser 23 to the external condenser 20. Information from the temperature sensor 45 and the pressure sensor 47 is output to the control unit 4 and used for controlling the cooling circuit 5.

[0025] The expansion valve 24 in this example is an electromagnetic valve with an adjustable throttle opening. During cooling, the expansion valve 24 is in the maximum open state. That is, the heat medium 8 hardly or not at all diffuses and expands in the expansion valve 24. Therefore, the high-temperature heat medium 8 flows into the external condenser 20 while remaining at a high temperature. The greater the difference between the outside air temperature and the temperature of the heat medium 8 in the external condenser 20, the more efficiently the heat of the heat medium 8 is released to the outside air.

[0026] Unlike this example, the heat pump circuit 2 may include a bypass path connecting the upstream and downstream of the expansion valve 24, and a valve capable of switching between the bypass path and a flow path toward the expansion valve 24. In this case, by operating the valve, the heat medium 8 can be diverted to the bypass path during cooling and not flow to the expansion valve 24. In such a configuration, the expansion valve 24 may be a non-electromagnetic valve with a fixed opening.

[0027] <Heating circuit> For the explanation of the heating circuit 6, please refer to Fig. 2. In Fig. 2, arrows indicate the flow direction of the heat medium 8 flowing in the heating circuit 6 and the flow direction of the heat medium 9 flowing in the heater-type heating circuit 3. The arrows are interpreted in the same way as in Fig. 1.

[0028] The heating circuit 6 includes an external condenser 20, a fan 11, a compressor 22, an internal condenser 23, and an expansion valve 24. The external condenser 20, the fan 11, and the compressor 22 are components shared with the cooling circuit 5. The heat medium 8 of the heating circuit 6 is also shared with the cooling circuit 5. Below, each component will be described along the flow direction of the heat medium 8 during heating.

[0029] During heating, the solenoid valve 21 is opened and the expansion valve 26 is closed. Therefore, the medium-temperature heat medium 8 discharged from the external condenser 20 flows toward the compressor 22. A part of the heat of the heat medium 8, which has been heated to a high temperature by the compressor 22, is transferred to the second internal condenser 30 in the internal condenser 23. The heat medium 8 discharged from the internal condenser 23 is diffused and expanded in the expansion valve 24. The temperature of the heat medium 8 drops sharply due to the diffusion and expansion.

[0030] The temperature of the heat medium 8 that flows into the external condenser 20 through the expansion valve 24 rises as the external condenser 20 absorbs heat from the outside air. Here, in order to absorb heat from the outside air, the temperature of the heat medium 8 in the external condenser 20 needs to be lower than the outside air temperature. The temperature of the heat medium 8 flowing into the external condenser 20 can be adjusted by the opening degree of the expansion valve 24. The opening degree is determined based on information from the temperature sensor 45 and the pressure sensor 47 in the heating circuit 6.

[0031] <Heater-type heating circuit> The heater-type heating circuit 3 is a circuit that assists the heating circuit 6 of the heat pump circuit 2. The heater-type heating circuit 3 includes a second internal condenser 30, a heater 31, a heater core 32, a reserve tank 33, and a pump 34. The heat medium 9 flowing through the heater-type heating circuit 3 is independent of the heat medium 8 of the cooling circuit 5 and the heating circuit 6. The heat medium 9 in this example is water or antifreeze. In FIG. 2, the flow direction of the heat medium 9 is also indicated by an arrow, similar to the flow direction of the heat medium 8. Each component will be described along the flow direction of the heat medium 9.

[0032] The second internal condenser 30 is a heat exchanger that receives heat from the internal condenser 23 and heats the heat medium 9 with the heat. The high-temperature heat medium 9 discharged from the second internal condenser 30 flows into the heater core 32 through the heater 31. The heater 31 is a device that consumes power to further heat the heat medium 9. The heater 31 is controlled based on information from a temperature sensor 46 that is arranged between the heater 31 and the heater core 32. When the temperature of the heat medium 9 acquired by the temperature sensor 46 is sufficient to maintain the heating set temperature, the heater 31 may be turned off.

[0033] The heater core 32 is a heat exchanger disposed inside the HVAC casing 2A. The structure of the heater core 32 is substantially the same as that of the external condenser 20. During heating, at least a part of the air mix door 28 is retracted between the evaporator 27 and the heater core 32. In this case, the conditioned air introduced from the inlet 2B by the blower 29 can pass through the heater core 32. The heated conditioned air that has passed through the heater core 32 is introduced into the vehicle interior through the outlet 2C.

[0034] The heat medium 9 that has released heat in the heater core 32 flows into the second internal condenser 30 through the reserve tank 33 and the pump 34. The reserve tank 33 removes air bubbles generated in the heater-type heating circuit 3 by cavitation. The reserve tank 33 is also used to replenish the heat medium 9. The pump 34 pressure-feeds the heat medium 9 to the second internal condenser 30, thereby circulating the heat medium 9 in the heater-type heating circuit 3.

[0035] Here, the heater-type heating circuit 3 is not an essential component. When the heater-type heating circuit 3 is not provided, the internal capacitor 23 is disposed in the casing 2A as a heater core.

[0036] <Control Unit> The control unit 4 controls the operation of each component of the heat pump circuit 2 based on information from the temperature sensors 41, 42, 43, 44, 45, 46 and the pressure sensor 47. The control unit 4 in this example is further configured to be able to acquire information from a vehicle speed sensor 48 and an accelerator sensor 49. The vehicle speed sensor 48 detects the speed of the electric vehicle 100. The speed can be obtained, for example, from the rotation speed of the wheels. The accelerator sensor 49 detects the operation state of the accelerator by the driver. The operation state can be obtained, for example, from the degree of depression of the accelerator pedal.

[0037] Each process by the control unit 4 is realized by a processing circuit including at least one processor. The processing circuit may be composed of an integrated circuit in which at least one memory, various analog circuits, and various digital circuits are combined in addition to the at least one processor. The at least one memory stores a program (instruction) that causes the at least one processor to execute each of the above processes. The at least one processor may execute each of the above processes according to the program read from the at least one memory, or may execute each of the above processes according to a logic circuit designed in advance to execute each of the above processes. The processor may be, for example, a CPU or a GPU, or any of various other processors suitable for computer control. Note that the physically separated processors may cooperate with each other to execute each of the above processes.

[0038] <Control to reduce power consumption during cooling> The control unit 4 of the vehicle structure 1 of this example performs specific control on the heat pump circuit 2 when specific conditions are met during travel of the electric vehicle 100. As a result, it is possible to reduce power consumption during cooling. The specific control will be described below based on the flowcharts shown in Figures 3 and 4. Figures 1 and 2 will be referenced as necessary in explaining the control.

[0039] First, the control unit 4 judges whether the conditions are met to implement control to reduce power consumption during cooling. Specifically, the control unit 4 judges whether the automatic air conditioner is operating in cooling mode (step S1 in FIG. 3). The automatic air conditioner refers to a state in which the heat pump circuit 2 is operating so that the temperature inside the vehicle is the set temperature of the air conditioner. If the automatic air conditioner is not operating in cooling mode, the control unit 4 returns to the processing of step S1.

[0040] When the automatic air conditioner is cooling, the control unit 4 judges whether or not the non-cool-down condition exists (step S2). The cool-down condition means that the temperature inside the vehicle is different from the set temperature of the air conditioner. That is, the air conditioner circuit 5 operates to quickly lower the temperature inside the vehicle. On the other hand, the non-cool-down condition means that the difference between the temperature inside the vehicle and the set temperature of the air conditioner is small, and the air conditioner circuit 5 is operating steadily at a low load. For example, the non-cool-down condition is judged when the temperature difference between the temperature inside the vehicle and the set temperature of the air conditioner is 5°C or less. In addition to the temperature difference, the temperature of the evaporator 27, i.e., the temperature of the temperature sensor 42, may be 10°C or less as a criterion for judgment. If the non-cool-down condition does not exist, the control unit 4 returns to the process of step S1.

[0041] Under non-cool-down conditions, the compressor 22 may be operated to the extent that the temperature inside the vehicle is maintained. That is, the load on the compressor 22 is small, and the power consumption of the compressor 22 is small. Here, when the electric vehicle 100 decelerates and stops under non-cool-down conditions, the heat exchange in the external condenser 20 cannot receive the assistance of the traveling wind. Therefore, in the conventional vehicle structure, the rotation speed of the fan 11 is increased when the vehicle is stopped, or the output of the compressor 22 is increased to increase the degree of temperature drop of the heat medium 8 in the expansion valve 24. As a result, the power consumption of the air conditioning circuit 5 when the vehicle is stopped increases. Therefore, in this example, when the non-cool-down conditions are met, the control unit 4 transitions to the control shown in FIG. 4.

[0042] The control unit 4 determines whether the electric vehicle 100 is decelerating (step S3). Whether the electric vehicle 100 is decelerating is determined based on information from the vehicle speed sensor 48 and the accelerator sensor 49. For example, if the vehicle speed is 30 km / h or less and the accelerator is off, it is determined that the vehicle is decelerating. If the vehicle is not decelerating, the control unit 4 returns to the process of step S3.

[0043] When the vehicle is decelerating, the control unit 4 lowers the set temperature of the evaporator 27 below the set temperature of the evaporator 27 that corresponds to the set temperature of the air conditioner (step S4). In other words, the evaporator 27 is placed in a supercooled state. This operation causes cold to be stored in the evaporator 27. For example, the set temperature of the evaporator 27 is set to a value that is 2°C lower than the set temperature before the lowering. The set temperature of the evaporator 27 is controlled based on information from the temperature sensors 42 and 43. Power consumption increases to lower the temperature of the evaporator 27, but the increase in power consumption can be suppressed by the regenerative energy during deceleration.

[0044] After the evaporator 27 is brought into the supercooled state, the control unit 4 judges whether or not the vehicle is in a stop preparation state (step S5). The stop preparation state means a state immediately before the electric vehicle 100 is stopped. For example, when the vehicle speed becomes 15 km / h or less, the state is judged to be the stop preparation state. When the vehicle is not in the stop preparation state, the control unit 4 returns to the process of step S5.

[0045] If the vehicle is in a stop preparation state, the control unit 4 opens the solenoid valve 21 and closes the expansion valve 26 to switch from the cooling circuit 5 to the heating circuit 6 (step S6). At this time, the fan 11 is stopped. The air mix door 28 is left in the position during cooling, that is, between the evaporator 27 and the heater core 32. By stopping the fan 11, the efficiency of heat exchange in the external condenser 20 is reduced. As a result, the low-temperature heat medium 8 from the expansion valve 24 cools the external condenser 20, and the cold is stored in the external condenser 20.

[0046] The operating time of the heating circuit 6 is, for example, the shorter of the time from when the vehicle speed reaches 15 km / m until the vehicle stops, or the time from when the vehicle speed reaches 15 km / m until 10 seconds have elapsed. However, to prevent control hunting, the operating time of the heating circuit 6 is 3 seconds or more.

[0047] After the electric vehicle 100 stops, the control unit 4 performs energy-saving cooling by utilizing the low temperature stored in the evaporator 27 and the external condenser 20. The air mix door 28 is left in the state shown in FIG. 1 during energy-saving cooling. Specifically, energy-saving cooling is cooling performed by setting the rotation speed of the compressor 22, the rotation speed of the fan 11, and the rotation speed of the blower 29 at fixed values ​​lower than the rotation speed during normal cooling. Cooling can be performed at such low fixed values ​​because the low temperature stored in the evaporator 27 and the external condenser 20 can be utilized. The power consumption during energy-saving cooling is smaller than that during normal cooling. Therefore, the power consumption of the electric vehicle 100 during movement of the electric vehicle 100 is reduced. If the number of times energy-saving cooling is performed increases, the total power consumption from the start to the end of movement of the electric vehicle 100 can be significantly reduced, and the cruising distance of the electric vehicle 100 can be extended.

[0048] During the energy-saving cooling, the control unit 4 judges whether or not the comfort has decreased (step S8). The decrease in comfort means that the cooling capacity of the energy-saving cooling is insufficient, that is, it is difficult to maintain the temperature inside the vehicle at the set temperature of the air conditioner. For example, if the temperature of the evaporator 27, i.e., the temperature detected by the temperature sensor 46, is equal to or higher than a predetermined value, for example, 10°C or higher, it is judged that the comfort has decreased. In addition, if the pressure detected by the pressure sensor 47 is equal to or higher than a predetermined value, for example, 1.5 MPa or higher, it is judged that the comfort has decreased. If the comfort has not decreased, the control unit 4 returns to the process of step S8. If the comfort has decreased, the control unit 4 ends the process. Then, the control unit 4 performs the normal cooling described with reference to FIG. 1.

[0049] Although not shown in the flowchart of FIG. 4, if the accelerator is turned on during processing, or if the set temperature of the air conditioner is lowered or the air volume is increased, the control unit 4 will stop the processing of FIG. 4 and perform normal cooling. [Explanation of symbols]

[0050] 1 Vehicle structure 10 radiator, 11 fan, 12 grill shutter 2 Heat pump circuit 2A Casing, 2B Inlet, 2C Outlet 20 external condenser, 21 solenoid valve, 22 compressor, 23 internal condenser 24,26 Expansion valve, 25 Accumulator 27 Evaporator, 28 Air mix door, 29 Blower 3 Heater type heating circuit 30 second internal capacitor, 31 heater, 32 heater core 33 Reserve tank, 34 Pump 4. Control Unit 41, 42, 43, 44, 45, 46 Temperature sensor, 47 Pressure sensor 48 Vehicle speed sensor, 49 Accelerator sensor 5 Cooling Circuit 6 Heating Circuit 8,9 Heat carrier 100 Electric Vehicles

Claims

[Claim 1] A vehicle structure of an electric vehicle driven by a battery, A heat pump type cooling circuit using a heat medium; a heat pump type heating circuit that shares the heat medium with the cooling circuit; A control unit that controls the cooling circuit and the heating circuit, The cooling circuit includes an external condenser that exchanges heat with outside air, a fan that blows air to the external condenser, a compressor that compresses the heat medium, and an evaporator. the heating circuit includes the external condenser, the fan, and the compressor that are shared with the cooling circuit; The control unit is When the cooling circuit is in operation and the electric vehicle is decelerating, the evaporator is placed in a supercooled state; Thereafter, when the electric vehicle is stopped, the heating circuit is operated with the fan stopped. Vehicle structure.

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