JP2019098906A - Vehicular waste heat utilization device - Google Patents

Abstract

A vehicle waste heat utilization apparatus capable of improving the heating efficiency on the cooling circuit side is provided. A cooling-side flow path includes a cooling-side pump, a flow control valve, a high-temperature heat source body, and a heat exchanger. In the air conditioning side flow path 52, an air conditioning side pump 60, a heat exchanger 110, and a heater core 64 are arranged in that order. The air conditioning controller 102 controls the flow rate control valve 34 so that the first temperature T12 of the first heat medium flowing into the heat exchanger 110 is higher than the second temperature T21 of the second heat medium flowing into the heat exchanger 110. Operate. [Selection] Figure 1

Description

  The present invention relates to a waste heat utilization device for a vehicle, which heats a passenger compartment by using waste heat of a heat source body such as a drive motor provided in an electric vehicle.

  A vehicle equipped with an engine absorbs the waste heat of the engine with a heat transfer medium to cool the engine, and dissipates the heat of the heat transfer medium with a heater core to heat the vehicle interior. On the other hand, an electric vehicle without an engine warms the vehicle interior by warming the heat medium with the waste heat of the drive motor or an electric heater and dissipating the heat of the heat medium with the heater core.

  In Patent Document 1, a cooling circuit for cooling a drive motor using cooling water (first heat medium), an air conditioning circuit for heating a vehicle interior using heating water (second heat medium), and cooling water And a heat exchanger for exchanging heat with the heating water.

JP, 2013-216283, A

  When heat is transferred from the first heat medium for cooling to the second heat medium for heating as in the waste heat utilization device for vehicles of Patent Document 1, the amount of heat transfer from the first heat medium to the second heat medium is It is desirable to increase the heating efficiency by increasing the size.

  The present invention has been made in consideration of such problems, and an object thereof is to provide a waste heat utilization device for a vehicle capable of improving the heating efficiency.

The present invention
A cooling circuit that causes the first heat medium to return to the cooling side flow path and absorbs heat from the heat source;
An air conditioning circuit which circulates the second heat medium to the air conditioning side flow passage and dissipates heat by the heater core;
A waste heat utilization device for a vehicle, comprising: a heat exchanger provided across the cooling circuit and the air conditioning circuit to perform heat exchange between the first heat medium and the second heat medium, ,
In the cooling side flow passage, a cooling side pump which sucks the first heat medium from the suction port and discharges it from the discharge port, and a flow rate of the first heat medium flowing from the upstream side, adjusting the flow rate A control valve, the heat source body, and the heat exchanger are arranged in this order;
In the air conditioning side flow passage, an air conditioning side pump that sucks the second heat medium from a suction port and discharges the second heat medium from a discharge port, the heat exchanger, and the heater core are arranged in that order
And a control unit for operating the flow control valve such that the temperature of the first heat medium flowing into the heat exchanger is higher than the temperature of the second heat medium flowing into the heat exchanger. It features.

  According to the above configuration, since the flow rate of the first heat medium flowing to the heat source can be adjusted by the flow control valve, the temperature of the first heat medium flowing through the heat exchanger can be adjusted. By reducing the flow rate of the first heat medium flowing through the heat source body, the amount of heat received from the heat source body by the first heat medium per unit amount increases, and the first heat medium becomes high temperature. Then, in the heat exchanger, the amount of heat transfer from the first heat medium to the second heat medium increases, and the temperature of the second heat medium rises. As described above, according to the above configuration, since the second heat medium can be heated by efficiently utilizing the waste heat of the heat source body, the heating efficiency is improved.

In the present invention,
The air conditioning side flow path is provided with an air conditioning side bypass flow path connected to the upstream side flow path and the downstream side flow path of the heat exchanger, and further, the second heat medium flowing through the upstream side flow path When the temperature exceeds the temperature of the second heat medium flowing in the downstream flow path, the air conditioning side bypass flow path is opened, and the temperature of the second heat medium flowing in the upstream flow path is the downstream flow path A valve that blocks the air conditioning side bypass flow passage may be disposed when the temperature of the second heat medium flowing through the air flow is lower than the temperature of the second heat transfer medium.

  If the temperature of the second heat medium flowing into the heat exchanger is higher than the temperature of the first heat medium flowing into the heat exchanger, heat transfer occurs from the second heat medium to the first heat medium. According to the above configuration, in the situation where heat is transferred from the second heat medium to the first heat medium, the temperature decrease of the second heat medium is suppressed in order to reduce the second heat medium flowing into the heat exchanger. Can.

In the present invention,
The air conditioner further includes an air conditioner that warms air with the heater core and blows the air to the interior or the exterior of the vehicle.
The control unit
When there is a request for heating operation to the air conditioner and the temperature of the first heat medium flowing out of the heat exchanger exceeds a predetermined upper limit temperature of the cooling circuit, the air warmed by the heater core is the car The air conditioner may be controlled to blow air outdoors.

  According to the above configuration, when the first temperature of the first heat medium flowing out of the heat exchanger exceeds the upper limit temperature of the cooling circuit, that is, when the heat source is overheated, waste heat of the heat source is removed outside the vehicle It can be dissipated.

  According to the present invention, it is possible to raise the temperature of the second heat medium by efficiently utilizing the waste heat of the heat source body, so energy consumption at the time of heating operation is reduced. That is, the heating efficiency is improved.

FIG. 1 is a block diagram of a waste heat utilization device for a vehicle according to the present embodiment. 2A and 2B are block diagrams of a heat exchanger. FIG. 3 is a flowchart of processing performed by the waste heat utilization device for a vehicle. FIG. 4 is a flowchart of the flow rate control process. FIG. 5 is a block diagram of a waste heat utilization device for a vehicle according to another embodiment.

  Hereinafter, a preferred embodiment of the waste heat utilization apparatus for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

[1. Configuration of waste heat utilization device 10 for vehicle]
The vehicle waste heat utilization apparatus 10 shown in FIG. 1 is provided in an electric vehicle such as an electric car or a hybrid car that travels by operating a drive motor with electric power supplied from a battery or a generator. The vehicle waste heat utilization apparatus 10 includes a cooling circuit 20, an air conditioning circuit 50, an air conditioner 70, a drive system control unit 100, and an air conditioning control unit 102, and further extends over the cooling circuit 20 and the air conditioning circuit 50. A heat exchanger 110 is provided.

  The cooling circuit 20 has an annular cooling side flow path 22 for refluxing a first heat medium such as water, and the first heat medium absorbs the heat from the low temperature heat source 32 and the high temperature heat source 36 to thereby achieve a low temperature heat source. 32 and the high temperature heat source 36 are cooled. In the cooling side flow passage 22, the cooling side pump 30, the low temperature heat source body 32, the flow control valve 34, the high temperature heat source body 36, the heat exchanger 110, the cooling side thermostat 38, and the radiator 40 (1) The heat transfer medium is disposed in the order along the reflux direction (arrow X). The cooling side bypass channel 24 is connected between the upstream channel and the downstream channel of the radiator 40 in the cooling channel 22. Further, the third port 34 c of the flow control valve 34 and the suction port 30 a of the cooling side pump 30 communicate with each other through the communication flow path 26. In the cooling circuit 20, the low temperature sensor 44 for detecting the first temperature T11 of the first heat medium flowing into the first port 34a of the flow control valve 34, and the first heat medium flowing into the heat exchanger 110 A first upstream temperature sensor 46 for detecting the first temperature T12 and a first downstream temperature sensor 48 for detecting the first temperature T13 of the first heat medium flowing out of the heat exchanger 110 are provided.

  The cooling-side pump 30 sucks the first heat medium at the suction port 30a and discharges the first heat medium from the discharge port 30b. The low temperature heat source body 32 is a cooling object that requires cooling, such as a drive circuit of a drive motor or a battery. The low temperature heat source body 32 is provided with a flow path of the first heat medium in close proximity. The heat of the low temperature heat source body 32 is absorbed by the first heat medium. The flow control valve 34 is connected to the communication flow path 26 with a first port 34 a connected to the cooling side flow path 22 on the upstream side, a second port 34 b connected to the cooling side flow path 22 on the downstream side And a third port 34c. The flow control valve 34 causes the first heat medium flowing into the first port 34a to flow from the second port 34b and the third port 34c, and at that time, the flow rate flowing from the second port 34b and the flow rate flowing from the third port 34c adjust. The high temperature heat source body 36 is a cooling object that needs to be cooled, such as a drive motor for traveling. The high temperature heat source body 36 is provided with a flow path of the first heat medium in close proximity. For example, the drive motor is covered with a case at its periphery, and the case is formed with a flow path for flowing the first heat medium. The heat of the drive motor is absorbed by the first heat medium through the case. The heat exchanger 110 will be described later.

  The cooling-side thermostat 38 is provided at a branch portion between the cooling-side flow passage 22 and the cooling-side bypass flow passage 24 and opens when the first temperature T13 of the first heat medium is lower than a predetermined temperature. The valve is closed when the first temperature T13 of the heat medium is equal to or higher than a predetermined temperature. When the cooling side thermostat 38 opens, the upstream side and the downstream side of the radiator 40 communicate with the cooling side flow passage 22 and the cooling side bypass flow passage 24, and when the cooling side thermostat 38 closes, the upstream side of the radiator 40 The downstream side communicates with only the cooling side flow passage 22. The radiator 40 is a heat exchange device provided with a flow path through which the first heat medium flows, performs heat exchange between the first heat medium and the air outside the vehicle, and dissipates the heat of the first heat medium to the outside of the vehicle . Note that, in order to efficiently dissipate heat by the radiator 40, a fan 42 is provided at the opposing position of the radiator 40.

  The air conditioning circuit 50 has an annular air conditioning side flow passage 52 for returning the second heat medium such as fluorocarbon, and the heater core 64 dissipates the heat of the second heat medium. In the air conditioning side flow path 52, the air conditioning side pump 60, the heat exchanger 110, the electric heater 62, and the heater core 64 are disposed in that order along the return direction (arrow Y) of the second heat medium. Be done. In the air conditioning circuit 50, a second upstream temperature sensor 66 for detecting the second temperature T21 of the second heat medium flowing into the heat exchanger 110, and a second temperature of the second heat medium flowing out of the heat exchanger 110 And a second downstream temperature sensor 68 for detecting T22.

  The air conditioning pump 60 sucks the second heat medium at the suction port 60 a and discharges the second heat medium from the discharge port 60 b. The heat exchanger 110 will be described later. The electric heater 62 switches between operation and stop in accordance with the command current of the air conditioning control unit 102, and heats the second heat medium at the time of operation. The heater core 64 is a heat exchange device provided with a flow path through which the second heat medium flows, and performs heat exchange between the second heat medium and the air in the air conditioning duct 76 of the air conditioner 70 to heat the second heat medium. Into the air conditioning duct 76.

  The air conditioner 70 includes an outside air introduction duct 72, an inside air circulation duct 74, an air conditioning duct 76, an air duct 80, an exhaust duct 78, a blower 82, a first door 84, a second door 86, and a third A door 88 and a fourth door 90 are provided. A blower 82 and a heater core 64 are disposed inside the air conditioning duct 76, the upstream side is connected to the outside air introduction duct 72 and the inside air circulation duct 74, and the downstream side is connected to the exhaust duct 78 and the air duct 80. The outside air introduction duct 72 communicates the outside of the vehicle with the upstream side of the air conditioning duct 76. The inside air circulation duct 74 brings the vehicle interior into communication with the upstream side of the air conditioning duct 76. The exhaust duct 78 communicates the outside of the vehicle with the downstream side of the air conditioning duct 76. The air duct 80 communicates the vehicle interior with the downstream side of the air conditioning duct 76.

  Blower 82 takes in air from outside the vehicle to the air conditioning duct 76 through the outside air introduction duct 72 or from the vehicle compartment through the inside air circulation duct 74, and to the outside of the vehicle through the exhaust duct 78 or the air duct 80 Act to pump air into the passenger compartment through the The heater core 64 is disposed between the blower 82 and the exhaust duct 78 and the air duct 80.

  The first door 84 is provided at the connection position of the air conditioning duct 76, the outside air introduction duct 72, and the inside air circulation duct 74. The first door 84 closes the outside air introduction duct 72 and opens the inside air circulation duct 74 with respect to the air conditioning duct 76, and opens the outside air introduction duct 72 and closes the inside air circulation duct 74. Switch. The second door 86 is provided on the upstream side of the heater core 64. The second door 86 is an air mix door that adjusts the amount of air flowed to the heater core 64 in the air sent from the blower 82. The third door 88 is provided at the connection position of the air conditioning duct 76 and the exhaust duct 78. The third door 88 switches between the open and close states of the exhaust duct 78 with respect to the air conditioning duct 76. The fourth door 90 is provided at the connection position of the air conditioning duct 76 and the air duct 80. The fourth door 90 switches between the state in which the air duct 80 is open and the state in which the air duct 80 is closed. A drive motor (not shown) performs the opening and closing operations of the first door 84 to the fourth door 90.

  The drive system control unit 100 and the air conditioning control unit 102 are both configured by an ECU, and include an arithmetic device such as a processor and a storage device such as a ROM or a RAM. The drive system control unit 100 and the air conditioning control unit 102 realize various functions by executing a program stored in the storage device by the arithmetic device. The drive system control unit 100 controls a drive circuit as the low temperature heat source body 32 and a drive motor as the high temperature heat source body 36. The air conditioning control unit 102 operates the various operation units of the air conditioner 70, for example, the rotation operation of the blower 82 and the first door 84 to the fourth door according to the heating request instructed by the operation panel 104 provided in the vehicle compartment. Control the open / close operation of 90. In addition, the air conditioning control unit 102 outputs a command current to the flow control valve 34 to adjust the flow rate of the first heat medium output from the second port 34 b.

  The storage device of the air conditioning control unit 102 stores predetermined temperatures regarding the first heat medium and the second heat medium. For the first heat medium, a cooling circuit upper limit temperature T1max, which is the upper limit temperature of the temperature range required for the first heat medium to function continuously as a refrigerant, is stored.

  Furthermore, the storage device of the air conditioning control unit 102 stores information on the flow rate of the first heat medium. For example, the flow rate Qmm of the first heat medium which must be flowed minimally to maintain the cooling circuit 20 is stored. Further, assuming that the temperature of the first heat medium necessary to maintain the function and strength of the drive motor as the high temperature heat source body 36 is Tm, the flow rate Qmt of the first heat medium necessary to maintain the temperature Tm is It can be calculated based on the heat generation amount C of the drive motor and the first temperature T11 of the first heat medium. In the present embodiment, a map M is set that associates the set of the heat generation amount C of the drive motor and the first temperature T11 of the first heat medium with the flow rate Qmt. The map M is obtained by an experiment or simulation performed in advance. The storage device of the air conditioning control unit 102 stores a map M corresponding to the temperature Tm.

[2. Configuration of Heat Exchanger 110]
As shown in FIGS. 2A and 2B, the heat exchanger 110 performs heat exchange between the first heat medium flowing through the cooling side flow passage 22 and the second heat medium flowing through the air conditioning side flow passage 52. It is a heat exchange device. The heat exchanger 110 includes a cooling circuit side heat exchanger 112 and an air conditioning circuit side heat exchanger 114. The cooling circuit side heat exchanger 112 is formed of a metal having a high thermal conductivity, such as aluminum, and a flow path through which the first heat medium flows is formed therein. The air conditioning circuit side heat exchanger 114 is formed of a metal having a high thermal conductivity, such as aluminum, and a flow path through which the second heat medium flows is formed therein.

  As shown in FIG. 2A, the cooling circuit side heat exchanger 112 and the air conditioning circuit side heat exchanger 114 may be directly connected to each other. Further, as shown in FIG. 2B, the cooling circuit side heat exchanger 112 and the air conditioning circuit side heat exchanger 114 may be connected to each other via the heat pipe 116 and the Peltier element 118.

[3. Operation of waste heat utilization device 10 for vehicle]
The operation of the vehicular waste heat utilization apparatus 10 will be described with reference to FIG. A series of processes described below are repeatedly performed at predetermined time intervals while the electric powered vehicle is powered on. The process of step S2 is a process of utilizing waste heat of the low temperature heat source body 32 and the high temperature heat source body 36 for heating the vehicle interior when heating is used, such as in winter. On the other hand, the process of step S3 to step S5 is a process of dissipating the waste heat of the low temperature heat source body 32 and the high temperature heat source body 36 to the outside of the vehicle when heating is not used.

  In step S1 of FIG. 3, the air conditioning control unit 102 determines whether there is a heating request for the air conditioner 70 or not. When the occupant of the electric vehicle operates the operation panel 104, the operation panel 104 outputs a heating operation signal or a heating stop signal to the air conditioning control unit 102. When the heating operation signal is input, the air conditioning control unit 102 determines that there is a heating request until the heating stop signal is input. If there is a heating request (step S1: YES), the process proceeds to step S2. On the other hand, when there is no heating request (step S1: NO), the process proceeds to step S3.

  When the process proceeds from step S1 to step S2, the air conditioning control unit 102 drives the blower 82 and the air conditioning pump 60. At this time, when the blower 82 and the air conditioning pump 60 are not driven yet, they are driven, and when the blower 82 and the air conditioning pump 60 are already driven, the driven state is maintained. The air conditioning control unit 102 adjusts the position of the second door 86 such that the blower 82 blows air to the heater core 64. Further, the position of the fourth door 90 is adjusted to open the air duct 80 and the position of the third door 88 is adjusted to adjust the position of the third door 88 so that the air warmed by the heater core 64 is blown into the vehicle compartment. Block the The air conditioning control unit 102 appropriately controls the flow control valve 34 when the blower is driven. The flow control process will be described in the following [4].

  When the process proceeds from step S1 to step S3, the air conditioning control unit 102 compares the first temperature T13 detected by the first downstream temperature sensor 48 with the cooling circuit upper limit temperature T1max. When T13> T1max (step S3: YES), the low temperature heat source body 32 and / or the high temperature heat source body 36 is overheated, and the first temperatures T11 to T13 of the first heat medium are excessively increased. The processing shifts to step S4. On the other hand, when T13 ≦ T1max (step S3: NO), the temperatures of the low temperature heat source body 32 and the high temperature heat source body 36 are within the allowable range and the first temperatures T11 to T13 of the first heat medium are not increased so much The process proceeds to step S6.

  When the process proceeds from step S3 to step S4, the air conditioning control unit 102 opens the air conditioning duct 76 to the outside of the vehicle. At this time, the air conditioning control unit 102 adjusts the positions of the first door 84 and the third door 88 to connect the air conditioning duct 76 and the outside of the vehicle. Further, the position of the second door 86 is adjusted such that the blower 82 blows air to the heater core 64. Also, the position of the fourth door 90 is adjusted to close the air duct 80.

  In step S5, the air conditioning control unit 102 drives the blower 82 and the air conditioning pump 60. At this time, when the blower 82 and the air conditioning pump 60 are not driven yet, they are driven, and when the blower 82 and the air conditioning pump 60 are already driven, the driven state is maintained. The air conditioning control unit 102 appropriately controls the flow control valve 34 when the blower is driven. The flow control process will be described in the following [4].

  When the process proceeds from step S3 to step S6, the air conditioning control unit 102 stops the blower 82 and the air conditioning pump 60. At this time, when the blower 82 and the air conditioning pump 60 are not stopped yet, they are stopped, and when the blower 82 and the air conditioning pump 60 are already stopped, the stopped state is maintained. At this point, the series of processes are temporarily ended, and the process waits until the next series of processes is performed.

[4. Flow control process]
The operation of the vehicular waste heat utilization apparatus 10 will be described with reference to FIG. The process described below is repeatedly executed together with the processes of heating (step S2 in FIG. 3) and exhaust heat to the outside of the vehicle (step S5 in FIG. 3).

  In step S11, the air conditioning control unit 102 compares the first temperature T12 of the first heat medium flowing out of the high temperature heat source body 36 (drive motor) with the temperature Tm. If T12 <Tm (step S11: YES), the high temperature heat source 36 (drive motor) is not in a state where the temperature and temperature of the high temperature heat source 36 can not be maintained, and the process proceeds to step S12. On the other hand, if T12 ≧ Tm (step S11: NO), the high-temperature heat source 36 (drive motor) is in a state where the temperature and temperature can not be maintained. Finish and wait until the timing to execute the next series of processing. At this time, the air conditioning control unit 102 controls the flow control valve 34 so that most of the first heat medium flowing into the first port 34 a of the flow control valve 34 flows from the second port 34 b.

  When the process proceeds from step S11 to step S12, the air conditioning control unit 102 calculates the flow rate Qmt. First, the air-conditioning control unit 102 calculates the calorific value C of the high-temperature heat source body 36 (drive motor) using a loss map using the motor torque and motor rotation information (rotation speed per unit time) as input parameters. Alternatively, while measuring the traveling position of the electric vehicle with the positioning device, the road information is acquired from the map information, and the heat generation amount C corresponding to the region (uphill etc.) where the heat generation amount C of the drive motor becomes high is calculated or stored. It may be read from the device. Next, the air conditioning control unit 102 obtains the flow rate Qmt using the heat generation amount C of the drive motor and the first temperature T11 detected by the low temperature sensor 44 as an input parameter of the map M.

  In step S13, the air-conditioning control unit 102 compares the flow rate Qmm of the first heat medium that must flow at least to maintain the cooling circuit 20 with the flow rate Qmt calculated in step S12. If Qmm <Qmt (step S13: YES), there is room to reduce the flow rate of the first heat medium supplied to the high temperature heat source 36 (drive motor), and the process proceeds to step S14. On the other hand, if Qmm Q Qmt (step S13: NO), there is no room to reduce the flow rate of the first heat medium supplied to the high temperature heat source 36 (drive motor), so the series of processes is temporarily ended here. Wait until it is time to execute the next series of processing. At this time, the air conditioning control unit 102 controls the flow control valve 34 so that most of the first heat medium flowing into the first port 34 a of the flow control valve 34 flows from the second port 34 b.

  When the process proceeds from step S13 to step S14, the air conditioning control unit 102 causes the flow control valve 34 to flow the flow rate Qmt of the first heat medium flowing into the first port 34a of the flow control valve 34 from the second port 34b. Control. At this time, the flow rate of the first heat medium flowing out of the second port 34b and flowing into the high temperature heat source 36 (drive motor) decreases, so the amount of heat received from the drive motor by the first heat medium per unit amount increases. . Then, the first heat medium flowing out of the drive motor and flowing into the cooling circuit side heat exchanger 112 has a high temperature. As a result, in the heat exchanger 110, the amount of heat transfer from the first heat medium to the second heat medium increases, and the temperature of the second heat medium rises.

[5. Another embodiment]
As shown in FIG. 5, in the air conditioning side flow path 52, the air conditioning side bypass flow path 54 is connected between the upstream side flow path and the downstream side flow path of the heat exchanger 110, and the air conditioning side bypass flow path A valve that opens / closes 54, for example, a flow control valve 92 may be disposed. The flow rate control valve 92 may be provided at a joining portion of the air conditioning side bypass flow passage 54 and the air conditioning side flow passage 52 as shown in FIG. 5 or may be provided at a branch portion. The air conditioning control unit 102 controls the opening and closing of the flow control valve 92 based on the second temperature T21 and the second temperature T22. For example, when the second temperature T21 exceeds the second temperature T22, the flow control valve 92 is controlled to open the air conditioning side bypass flow path 54. At this time, the second heat medium does not flow through the heat exchanger 110 but flows through the air conditioning side bypass flow path 54. When the second temperature T22 exceeds the second temperature T21, the flow control valve 92 is controlled to close the air conditioning side bypass flow passage 54. At this time, the second heat medium flows through the heat exchanger 110 without flowing through the air conditioning side bypass flow path 54.

  The cooling circuit 20 and the air conditioning circuit 50 shown in FIGS. 1 and 5 have only basic components. The cooling circuit 20 and / or the air conditioning circuit 50 may have other components and flow paths as long as the function of the present embodiment is not impaired. For example, a compressor may be provided instead of the air conditioning pump 60. In this case, a compressor may be provided upstream of the heater core 64, and a pressure reducing valve may be further provided between the heater core 64 and the heat exchanger 110.

[6. Summary of embodiment]
The vehicle waste heat utilization apparatus 10 circulates the first heat medium into the cooling side flow passage 22 and absorbs heat from the high temperature heat source body 36, and causes the second heat medium to flow back into the air conditioning side flow passage 52. An air conditioning circuit 50 for dissipating heat by the heater core 64, and a heat exchanger 110 which is provided across the cooling circuit 20 and the air conditioning circuit 50 and exchanges heat between the first heat medium and the second heat medium And. In the cooling side flow passage 22, the flow rate of the first heat medium flowing in from the upstream side by adjusting the flow rate of the first heat medium flowing in from the upstream side, the cooling side pump 30 sucking the first heat medium from the suction port 30a and discharging it from the discharge port 30b The flow control valve 34, the high temperature heat source body 36, and the heat exchanger 110 are disposed in this order. In the air conditioning side flow path 52, the air conditioning side pump 60 that sucks the second heat medium from the suction port 60a and discharges the second heat medium from the discharge port 60b, the heat exchanger 110, and the heater core 64 are arranged in that order. Furthermore, in the vehicle waste heat utilization apparatus 10, the first temperature T12 of the first heat medium flowing into the heat exchanger 110 is higher than the second temperature T21 of the second heat medium flowing into the heat exchanger 110. The air conditioning control unit 102 that operates the flow control valve 34 is provided.

  According to the above configuration, since the flow rate of the first heat medium flowing to the high temperature heat source body 36 can be adjusted by the flow control valve 34, the first temperature T12 of the first heat medium flowing through the heat exchanger 110 is adjusted. Can. By reducing the flow rate of the first heat medium flowing through the high temperature heat source body 36, the amount of heat received from the high temperature heat source body 36 by the first heat medium per unit amount becomes large, and the first heat medium becomes high temperature. Then, in the heat exchanger 110, the amount of heat transfer from the first heat medium to the second heat medium increases, and the temperature of the second heat medium rises. As described above, according to the above configuration, since the second heat medium can be heated by efficiently utilizing the waste heat of the high-temperature heat source body 36, the heating efficiency is improved.

  The air conditioning side flow path 52 is provided with an air conditioning side bypass flow path 54 connected to the upstream side flow path and the downstream side flow path of the heat exchanger 110, and further, the second heat medium flowing in the upstream side flow path When the second temperature T21 exceeds the second temperature T22 of the second heat medium flowing in the downstream side flow path, the air conditioning side bypass flow path 54 is opened, and the second temperature T21 of the second heat medium flowing in the upstream side flow path is downstream A valve, for example, a flow control valve 92, is disposed to close the air conditioning side bypass channel 54 when the temperature is lower than the second temperature T22 of the second heat medium flowing in the side channel.

  When the second temperature T21 of the second heat medium flowing into the heat exchanger 110 is higher than the first temperature T12 of the first heat medium flowing into the heat exchanger 110, the heat transfer from the second heat medium to the first heat medium It will be done. According to the above configuration, in the situation where heat is transferred from the second heat medium to the first heat medium, the second heat medium flowing into the heat exchanger 110 is reduced, thereby suppressing the temperature decrease of the second heat medium be able to.

  The vehicle waste heat utilization device 10 further includes an air conditioner 70 that warms the air with the heater core 64 and blows the air to the interior or the exterior of the vehicle. Air conditioning control unit 102 has heater core 64 when there is a request for heating operation to air conditioner 70 and first temperature T13 of the first heat medium flowing out of heat exchanger 110 exceeds predetermined cooling circuit upper limit temperature T1max. The air conditioner 70 is controlled such that the air warmed by the air conditioning air is blown to the outside of the vehicle.

  According to the above configuration, when the first temperature T13 of the first heat medium flowing out of the heat exchanger 110 exceeds the cooling circuit upper limit temperature T1max, that is, when the high temperature heat source body 36 is overheated, the high temperature heat source body 36 Waste heat can be dissipated outside the vehicle.

  The waste heat utilization device for a vehicle according to the present invention is not limited to the above embodiment, and it goes without saying that various configurations can be adopted without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Waste heat utilization apparatus for vehicles 22 ... Cooling side flow path 30 ... Cooling side pump 30a, 60a ... Suction port 30b, 60b ... Discharge port 34 ... Flow control valve 36 ... High temperature heat source body 50 ... Air-conditioning circuit 52 ... Air-conditioning side flow Road 60 ... air conditioning side pump 64 ... heater core 102 ... air conditioning control unit 110 ... heat exchanger

Claims (3)

A cooling circuit that causes the first heat medium to return to the cooling side flow path and absorbs heat from the heat source;
An air conditioning circuit which circulates the second heat medium to the air conditioning side flow passage and dissipates heat by the heater core;
A waste heat utilization device for a vehicle, comprising: a heat exchanger provided across the cooling circuit and the air conditioning circuit to perform heat exchange between the first heat medium and the second heat medium, ,
In the cooling side flow passage, a cooling side pump which sucks the first heat medium from the suction port and discharges it from the discharge port, and a flow rate of the first heat medium flowing from the upstream side, adjusting the flow rate A control valve, the heat source body, and the heat exchanger are arranged in this order;
In the air conditioning side flow passage, an air conditioning side pump that sucks the second heat medium from a suction port and discharges the second heat medium from a discharge port, the heat exchanger, and the heater core are arranged in that order
And a control unit for operating the flow control valve such that the temperature of the first heat medium flowing into the heat exchanger is higher than the temperature of the second heat medium flowing into the heat exchanger. The waste heat utilization device for vehicles which is characterized. In the waste heat utilization device for a vehicle according to claim 1,
The air conditioning side flow path is provided with an air conditioning side bypass flow path connected to the upstream side flow path and the downstream side flow path of the heat exchanger, and further, the second heat medium flowing through the upstream side flow path When the temperature exceeds the temperature of the second heat medium flowing in the downstream flow path, the air conditioning side bypass flow path is opened, and the temperature of the second heat medium flowing in the upstream flow path is the downstream flow path A waste heat utilization device for a vehicle, comprising: a valve that closes the air conditioning side bypass flow passage when the temperature of the second heat transfer medium flowing through the air conditioner is lower than the temperature of the second heat transfer medium. In the waste heat utilization device for a vehicle according to claim 1,
The air conditioner further includes an air conditioner that warms air with the heater core and blows the air to the interior or the exterior of the vehicle.
The control unit
When there is a request for heating operation to the air conditioner and the temperature of the first heat medium flowing out of the heat exchanger exceeds a predetermined upper limit temperature of the cooling circuit, the air warmed by the heater core is the car A waste heat utilization device for a vehicle, wherein the air conditioner is controlled so as to blow air to the outside.

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