JP2019189083A - Cooling device - Google Patents

Abstract

To provide a cooling device of a motor or the like which can improve cooling efficiency in a cabin.SOLUTION: When a normal cooling operation mode is set in a step 220, a control device of a cooling device controls a flow rate adjustment device so that a radiator cooling water passage flow rate is increased as a temperature of a motor becomes high. When it is predicted that the temperature of the motor does not exceed an upper limit of a management temperature for a predetermined period of time from a current time point in steps 230, 240 when an outdoor heat exchanger of a heat pump arranged at the radiator functions as a heat sink, a flow rate suppression operation mode is set in a step 250. When setting the flow rate suppression operation mode, the flow rate adjustment device is controlled so that the radiator cooling water passage flow rate is reduced more than that in the normal cooling operation mode.SELECTED DRAWING: Figure 4

Description

  The technology disclosed herein relates to a cooling device that cools either a traveling motor mounted on a vehicle or a related device.

  2. Description of the Related Art Conventionally, there is a cooling device that cools heat generating devices such as a traveling motor and an inverter device mounted on a vehicle. In such a device, one that effectively uses waste heat of a heat generating device for heating a vehicle interior is known. Such an apparatus is disclosed, for example, in Patent Document 1 below.

JP 2013-28328 A

  However, Patent Document 1 does not describe anything about cooling the passenger compartment. Even in a vehicle equipped with a cooling device for cooling a heat generating device, it is desirable to efficiently cool the passenger compartment.

  An object of the technology disclosed herein is to provide a cooling device capable of improving the cooling efficiency of a vehicle interior.

In order to achieve the above object, in the disclosed cooling device,
A cooling device mounted on a vehicle having a traveling motor (120) as a driving source for traveling,
A circulation passage (110) through which a cooling medium for cooling at least one heat generating device (120) among the traveling motor and the related devices (130, 140) related to the traveling motor can be circulated;
A radiator (112) provided in the middle of the circulation flow path for releasing heat of the cooling medium to the outside air;
A flow rate adjustment device (111) capable of adjusting the flow rate of the cooling medium passing through the radiator;
A control device (102) for controlling the operation of the flow control device,
A radiator is juxtaposed in the direction of the outdoor air flow with respect to the outdoor heat exchanger (13) of the heat pump device (10) that circulates the refrigerant to air-condition the vehicle interior,
The control device
A normal cooling operation mode (220) for controlling the flow rate adjusting device so that the passing flow rate increases as the temperature of the heat generating device increases, and
When the outdoor heat exchanger is functioning as a radiator that radiates heat from the refrigerant to the outside air, it is normal It is possible to switch the setting between the flow rate suppression operation mode (250) for controlling the flow rate adjusting device so that the passing flow rate is smaller than that in the operation mode.

  According to this, when the flow rate suppression mode is set when the temperature of the heat generating device is predicted not to exceed the upper limit of the management temperature until the predetermined time has elapsed, the flow rate of the cooling medium passing through the radiator is reduced as compared with the normal cooling operation. . Therefore, when the heat pump device performs cooling operation and the outdoor heat exchanger functions as a radiator, it is possible to reduce the amount of heat released from the radiator and improve the heat radiation performance of the outdoor heat exchangers arranged in parallel. it can. In this way, it is possible to improve the cooling efficiency when the vehicle interior is cooled.

  In addition, the code | symbol in the parenthesis described in a claim and this clause shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The range of an indication technique is limited It is not a thing.

It is a schematic block diagram which shows the cooling device which concerns on 1st Embodiment with an air conditioner. It is a block diagram which shows the heating operation state of an air conditioner. It is a block diagram which shows the cooling operation state of an air conditioner. It is a flowchart which shows the outline control operation | movement which the control apparatus of a cooling device performs. It is a time chart which shows the example of an action | operation of the cooling device at the time of air conditioning apparatus air_conditionaing | cooling operation. It is a time chart which shows the example of an action | operation of the cooling device at the time of an air conditioning apparatus heating operation.

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

(First embodiment)
A first embodiment to which the disclosed technology is applied will be described with reference to FIGS.

  As shown in FIG. 1, the cooling device 100 is a device mounted on, for example, an electric vehicle (EV) including a motor generator (M / G) 120 that functions as a traveling motor as a driving source for traveling. Hereinafter, the motor generator 120 may be referred to as a traveling motor 120 or simply a motor 120.

  The cooling device 100 includes a circulation channel 110, a pump 111, a radiator 112, an outdoor fan 113, a temperature sensor 121, and a motor generator control device (M / GECU) 102. Hereinafter, a motor generator control device (M / GECU) 102 corresponding to the control device in the present embodiment may be referred to as MGECU 102.

  The circulation flow path 110 is a flow path that circulates cooling water as a cooling medium for cooling the motor 120, which is a heat generating device, to the outside of the motor 120. The radiator 112 is provided in the middle of the circulation flow path 110 and is disposed, for example, behind a grille in front of the vehicle. The radiator 112 is a heat-dissipating heat exchanger that releases the heat of the cooling water to the outside air and cools the cooling water whose temperature has increased through the motor 120.

  The pump 111 is provided in the circulation channel 110 between the radiator 112 cooling water outlet and the motor 120 cooling water inlet. The pump 111 is a pump device that circulates cooling water through the circulation flow path 110. The pump 111 can adjust the flow rate of the cooling water circulating through the circulation flow path 110 by changing the number of rotations, for example. In the present embodiment, the pump 111 corresponds to a flow rate adjusting device that can adjust the flow rate of the cooling medium passing through the radiator 112.

  The outdoor fan 113 is disposed on the vehicle rear side of the radiator 112. The outdoor fan 113 is, for example, an axial-flow fan, and is a suction-type air supply device that supplies outside air from the vehicle front side to the rear side to the radiator 112 and an outdoor heat exchanger 13 described later. The outdoor fan 113 is an electric blower whose rotation speed is controlled by a control voltage. The outdoor fan 113 can adjust the air volume of the outside air flowing through the radiator 112 and the outdoor heat exchanger 13 by changing the rotation speed. The outdoor fan 113 corresponds to the fan in this embodiment. Hereinafter, the outdoor fan 113 may be simply referred to as the fan 113.

  The MGECU 102 is a control device including a microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. The MGECU 102 inputs the state information of the motor 120 including the temperature information from the temperature sensor 121 that detects the temperature of the motor 120. In addition, the MGECU 102 inputs current information, voltage information, and the like from the inverter device 130 that drives the motor 120, and inputs storage information of the storage battery 140 and the like.

  The MGECU 102 also receives information from an air conditioner ECU (A / CECU) 2 that is a control device of the vehicle air conditioner 1 described later, and information from the DSSECU 150 that is a control device of the driver support system. Hereinafter, the air conditioner ECU 2 may be referred to as A / CECU 2 or ACECU 2. From the ACECU 2, for example, the refrigerant pressure is input as an example of refrigerant state information inside the outdoor heat exchanger 13. The refrigerant state information inside the outdoor heat exchanger 13 is not limited to the refrigerant pressure, and may be other information such as the refrigerant temperature. From DSSECU 150, for example, vehicle position information acquired by a navigation device or the like, and traffic information such as traffic jam information are input.

  Based on the input information, the MGECU 102 outputs an operation signal to the switching element of the inverter device 130 to drive and control the motor 120. When the vehicle performs regenerative braking and the motor generator 120 functions as a generator, regenerative energy is supplied as electric energy to the storage battery 140 and the like.

  The MGECU 102 controls operations of the pump 111, the outdoor fan 113, the grill shutter 114, and the like based on input information from the temperature sensor 121 and the like. The grill shutter 114 is an opening / closing device that is provided on the front surface of the vehicle and can be switched between a state in which outside air is allowed to flow and a state in which it is prohibited from flowing into the motor room in which the motor 120 and the like are disposed.

  As shown in FIG. 1, the vehicle air conditioner 1 is also mounted on the vehicle on which the cooling device 100 is mounted. The vehicle air conditioner 1 includes a heat pump cycle 10, an air conditioning unit 30, an ACECU 2 that is a control means, and the like. The heat pump cycle 10, also called a heat pump device, is a vapor compression heat pump cycle that adjusts the temperature of the blown air into the passenger compartment. The air conditioning unit 30 blows out the blown air whose temperature has been adjusted by the heat pump cycle 10 into the vehicle interior. The ACECU 2 controls the operation of various components of the vehicle air conditioner 1.

  The heat pump cycle 10 switches between a cooling mode (cooling operation) refrigerant circuit that cools the blown air and cools the passenger compartment, and a heating mode (heating operation) refrigerant circuit that heats the blown air and heats the passenger compartment. It is configured to be possible. In FIG. 2, the refrigerant | coolant distribution | circulation part in heating mode is shown as the continuous line, and the part where the distribution | circulation of the refrigerant | coolant was stopped is shown with the broken line. In FIG. 3, the refrigerant circulation portion in the cooling mode is indicated by a solid line, and the refrigerant distribution portion is indicated by a broken line.

  The heat pump cycle 10 includes a compressor 11, an indoor condenser 12, an outdoor heat exchanger 13, an indoor evaporator 14, an accumulator 15, a heating expansion valve 21, a cooling expansion valve 22, an electromagnetic valve 23, a check valve 24, and the like. It has.

  The compressor 11 is a fluid machine that compresses and discharges sucked refrigerant. The indoor condenser 12 is a heat exchanger for heating that heats blown air. The indoor evaporator 14 is a cooling heat exchanger that cools the blown air. The heating expansion valve 21 and the cooling expansion valve 22 are decompression devices that decompress and expand the refrigerant. The solenoid valve 23 is a refrigerant circuit switching unit that switches between a cooling mode refrigerant circuit and a heating mode refrigerant circuit.

  In the heat pump cycle 10, for example, an HFC-based refrigerant is used as the refrigerant, and a vapor compression subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the critical pressure of the refrigerant is configured.

  The compressor 11 is disposed, for example, in a motor room of a vehicle outside the passenger compartment. The compressor 11 sucks, compresses and discharges the refrigerant in the heat pump cycle 10, and uses an electric motor for a fixed capacity type compression mechanism with a fixed discharge capacity. It is configured as an electric compressor to be driven. Specifically, various compression mechanisms such as a scroll type compression mechanism and a vane type compression mechanism can be adopted as the fixed capacity type compression mechanism.

  The electric motor is an AC motor whose rotation speed is controlled by, for example, an AC voltage output from an inverter. The inverter outputs an alternating voltage having a frequency corresponding to a control signal output from the ACECU 2. The refrigerant discharge capacity of the compressor 11 is changed by the rotation speed control output.

  The refrigerant inlet side of the indoor condenser 12 is connected to the discharge port side of the compressor 11. The indoor condenser 12 is disposed in an air conditioning case 31 that forms an air passage for the blown air blown into the vehicle interior in the air conditioning unit 30 and blows air by exchanging heat between the refrigerant circulating in the interior and the blown air. It is a heat exchanger for heating which heats air. The air conditioning case may be called an air conditioning duct.

  The refrigerant outlet side of the indoor condenser 12 is connected to the refrigerant inlet side of the outdoor heat exchanger 13 via a heating expansion valve 21 that decompresses the refrigerant in the heating mode. The heating expansion valve 21 is, for example, an electric expansion valve with a fully open function. The heating expansion valve 21 is not limited to an electric expansion valve with a fully open function. As the expansion valve 21 for heating, for example, an electric expansion valve without a fully open function and an opening / closing valve provided in parallel with the electric expansion valve may be used.

  The outdoor heat exchanger 13 is arranged in the motor room, and exchanges heat between the refrigerant circulating in the interior and the air outside the vehicle (outside air) blown from the outdoor fan 113. The outdoor heat exchanger 13 functions as an evaporator (heat absorber) that evaporates low-pressure refrigerant and exerts an endothermic effect during heating operation. The outdoor heat exchanger 13 functions as a heat radiator that radiates high-pressure refrigerant during cooling operation.

  The outdoor heat exchanger 13 is arranged in parallel with the radiator 112 in the outdoor air circulation direction. The outdoor heat exchanger 13 is arranged in parallel with the radiator 112 on the vehicle front side. That is, the outdoor heat exchanger 13 is disposed between the grill shutter 114 and the radiator 112, and the outside air supplied from the vehicle front side to the rear side passes through the outdoor heat exchanger 13 and the radiator 112 in this order. Yes.

  The core part, which is a heat exchange part of the outdoor heat exchanger 13, and the core part, which is a heat exchange part of the radiator 112, spread in the vehicle width direction and the vehicle front-rear direction, respectively. They are arranged so as to overlap. The outdoor fan 113 is provided as a common fan for circulating outside air between the core part of the outdoor heat exchanger 13 and the core part of the radiator 112.

  The refrigerant outlet side of the outdoor heat exchanger 13 is connected to the refrigerant inlet side of the indoor evaporator 14 via a cooling expansion valve 22 that decompresses the refrigerant in the cooling mode. As the cooling expansion valve 22, for example, a variable throttle mechanism such as an electric expansion valve with a fully closed function can be used. Further, the cooling expansion valve 22 is not limited to this as long as it can exhibit the function of reducing the pressure of the refrigerant in the cooling mode. The cooling expansion valve 22 may be an electric expansion valve without a fully closed function. The cooling expansion valve 22 is not limited to a variable throttle, and a fixed throttle such as an orifice or a capillary tube can also be adopted.

  A check valve 24 is provided in the refrigerant passage connecting the refrigerant outlet side of the outdoor heat exchanger 13 and the refrigerant inlet side of the indoor evaporator 14. The check valve 24 allows the refrigerant to flow from the refrigerant outlet of the outdoor heat exchanger 13 to the refrigerant inlet of the indoor evaporator 14 and prohibits the refrigerant from flowing in the reverse direction.

  On the refrigerant outlet side of the outdoor heat exchanger 13, an electromagnetic valve 23 is provided in a passage that bypasses the check valve 24, the cooling expansion valve 22, and the indoor evaporator 14. The solenoid valve 23 constitutes a refrigerant circuit switching unit that switches between a refrigerant circuit in the cooling mode and a refrigerant circuit in the heating mode, and is an on-off valve whose operation is controlled by a control signal output from the ACECU 2. Specifically, the electromagnetic valve 23 is closed during the cooling mode and opened during the heating mode.

  Note that the pressure loss that occurs when the refrigerant passes through the solenoid valve 23 with the solenoid valve 23 open is in contrast to the pressure loss that occurs when the refrigerant passes through the cooling expansion valve 22 with the solenoid valve 23 closed. And very small. Therefore, even if the cooling expansion valve 22 does not have a fully-closed function, when the electromagnetic valve 23 is opened, almost the entire flow rate of the refrigerant flowing out of the outdoor heat exchanger 13 passes through the electromagnetic valve 23 and is accumulated. It flows to the 15 side.

  The indoor evaporator 14 is disposed in the air conditioning case 31 on the upstream side of the blown air flow of the indoor condenser 12, and cools the blown air by exchanging heat between the refrigerant circulating in the interior and the blown air. Heat exchanger. The inlet side of the accumulator 15 is connected to the refrigerant outlet side of the indoor evaporator 14. The accumulator 15 is a gas-liquid separator that separates the gas-liquid of the refrigerant that has flowed into the accumulator 15 and stores excess refrigerant in the cycle. Further, the suction port side of the compressor 11 is connected to the gas-phase refrigerant outlet of the accumulator 15.

  Next, the air conditioning unit 30 will be described. The air conditioning unit 30 is disposed, for example, inside the instrument panel at the forefront of the vehicle interior. The air conditioning unit 30 houses the blower 32, the indoor evaporator 14, the indoor condenser 12, the air mix door 34, and the like in an air conditioning case 31 that forms an outer shell thereof. The air conditioning case 31 has a certain degree of elasticity and is formed of a resin that is excellent in strength, and forms an air passage for blown air that is blown into the vehicle interior. On the most upstream side of the air flow of the air conditioning case 31, an inside / outside air switching device 33 that switches and introduces air (inside air) and outside air into the case is arranged in the case.

  The inside / outside air switching device 33 continuously adjusts the opening area of the inside air introduction port for introducing the inside air into the air conditioning case 31 and the outside air introduction port for introducing the outside air by the inside / outside air switching door, and the amount of the inside air and the outside air are adjusted. The air volume ratio with the air volume is continuously changed. The inside / outside air switching door is driven by an electric actuator for the inside / outside air switching door. The operation of the electric actuator is controlled by a control signal output from the ACECU 2.

  On the downstream side of the air flow of the inside / outside air switching device 33, a blower 32 that blows air sucked through the inside / outside air switching device 33 toward the vehicle interior is arranged. The blower 32 as a blower means is an electric blower that drives a centrifugal multiblade fan with an electric motor, for example, and the number of rotations (the amount of blown air) is controlled by a control voltage output from the ACECU 2.

  On the downstream side of the air flow of the blower 32, the indoor evaporator 14 and the indoor condenser 12 are arranged in the order of the indoor evaporator 14 and the indoor condenser 12 with respect to the flow of the blown air. In the air conditioning case 31, an air mix door 34 that adjusts the air volume ratio between the air volume that passes through the indoor condenser 12 and the air volume that does not pass through the indoor condenser 12 among the blown air that has passed through the indoor evaporator 14 is disposed. Has been. The air mix door 34 is driven by an electric actuator for driving the air mix door. The operation of the electric actuator is controlled by a control signal output from the ACECU 2.

  In the present embodiment, in the heating mode, as shown in FIG. 2, the air mix door 34 is displaced to a heating position where the entire air volume of the blown air after passing through the indoor evaporator 14 flows into the indoor condenser 12. Therefore, the blown air after passing through the indoor evaporator 14 passes through the indoor condenser 12 and flows through the warm air passage, and reaches the air mix part 35 formed on the upstream side of the plurality of openings for blowing. In the cooling mode, as shown in FIG. 3, the air mix door 34 is displaced to a cooling position in which the total air volume of the blown air after passing through the indoor evaporator 14 bypasses the indoor condenser 12. Therefore, the blown air after passing through the indoor evaporator 14 flows through the cool air passage and reaches the air mix unit 35 formed on the upstream side of the plurality of blowing openings.

  An airflow case 31 is provided with an opening for blowing the blown air that has passed through the indoor condenser 12 or the blown air that has bypassed the indoor condenser 12 into the air conditioning target space in the most downstream portion of the air flow case 31. . This opening includes a defroster opening that blows air-conditioned air toward the inner side of the vehicle front window glass, a face opening that blows air-conditioned air toward the upper body of the passenger in the passenger compartment, and a foot that blows air-conditioned air toward the feet of the passenger An opening is provided. The air flow downstream side of these openings is provided with a face outlet, a foot outlet, and a defroster outlet, each of which includes a center face outlet, a side face outlet, and the like provided in the vehicle interior via ducts that form air passages. Connected to the exit.

  Therefore, in the cooling mode, the opening degree of the air mix door 34 is adjusted, and a part of the blown air cooled by the indoor evaporator 14 is reheated by the indoor condenser 12, so that the air from the outlet to the vehicle interior. You may make it adjust the temperature of the blowing air blown off.

  Further, doors for adjusting the opening area are provided on the upstream side of the air flow of the defroster opening, the face opening, and the foot opening, respectively. A defroster door for adjusting the opening area of the defroster opening, a face door for adjusting the opening area of the face opening, and a foot door for adjusting the opening area of the foot opening are arranged.

  The face door, the defroster door, and the foot door constitute the outlet mode switching means for switching the outlet mode, and are linked to and linked to an electric actuator for driving the outlet mode door via a link mechanism or the like. It is rotated. The operation of the electric actuator for driving the outlet mode door is also controlled by a control signal output from the ACECU 2.

  In addition, the outlet mode switched by the outlet mode switching means includes a face mode, a bi-level mode, a foot mode, and a foot defroster mode. In the face mode, air is blown out toward the upper body of the passenger in the passenger compartment from the center face outlet or the like. In the bi-level mode, both the center face air outlet and the foot air outlet are opened, and air is blown out toward the upper body and feet of the passengers in the passenger compartment. In the foot mode, the foot air outlet is fully opened and the defroster air outlet is opened by a small opening, and air is mainly blown out from the foot air outlet. In the foot defroster mode, the foot outlet and the defroster outlet are opened to the same extent, and air is blown out from both the foot outlet and the defroster outlet. Furthermore, the defroster mode in which the occupant manually operates the blow mode switching switch provided on the operation panel (not shown) to fully open the defroster blowout port and blow out air from the defroster blowout port to the inner surface of the front window glass. it can.

  The ACECU 2 includes a microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. Then, various calculations and processes are performed based on the air conditioning control program stored in the ROM, and the compressor 11, the heating expansion valve 21, the cooling expansion valve 22, the electromagnetic valve 23, and the blower connected to the output side thereof. 32. Control the operation of the various electric actuators described above.

  The ACECU 2 opens the electromagnetic valve 23 and closes the cooling expansion valve 22 during the heating operation, and circulates the refrigerant to the heat pump cycle 10 as shown in FIG. In the cooling operation, the ACECU 2 closes the electromagnetic valve 23, fully opens the heating expansion valve 21, and circulates the refrigerant to the heat pump cycle 10 as shown in FIG.

  On the input side of the ACECU 2, detection signals of a sensor group for air conditioning control such as the refrigerant temperature pressure sensor 61, the refrigerant temperature sensor 62, the blowing temperature sensor 63, and the indoor temperature sensor 64 are input. Furthermore, operation signals from various air conditioning operation switches provided on an operation panel (not shown) near the instrument panel in the front part of the vehicle interior are input to the input side of the ACECU 2.

  The refrigerant temperature / pressure sensor 61 detects the temperature and pressure of the refrigerant before flowing out from the indoor condenser 12 and into the heating expansion valve 21. The refrigerant temperature sensor 62 detects the refrigerant temperature at the outlet of the outdoor heat exchanger that flows out of the outdoor heat exchanger 13. The blowing temperature sensor 63 detects the temperature of the air blown into the vehicle compartment immediately after passing through the indoor condenser 12. The indoor temperature sensor 64 detects the air temperature in the vehicle interior.

  The ACECU 2 is a control device in which control means for controlling various air conditioning components connected to the output side is integrally configured. The ACECU 2 can control a cooling operation for cooling the blown air by the indoor evaporator 14 and a heating operation for heating the blown air by the indoor condenser 12.

  In the present embodiment, the outdoor fan 113 is a fan common to both heat exchangers that can adjust the air volume of the outside air flowing through the outdoor heat exchanger 13 of the vehicle air conditioner 1 and the radiator 112 of the cooling device 100. . The rotational speed of the outdoor fan 113 is controlled by the MGECU 102. The MGECU 102 controls the rotational speed of the outdoor fan 113 based on the refrigerant state information of the outdoor heat exchanger 13 input from the ACECU 2 and the temperature information of the motor 120 acquired from the temperature sensor 121. The MGECU 102 controls the rotational speed of the outdoor fan 113 so that desired heat exchange is possible in both heat exchangers based on the input information and fan control map information set and stored in advance, for example.

  Next, the operation of the cooling device 100 will be described based on the above configuration. FIG. 4 is a flowchart showing a schematic control operation of the cooling device 100 by the MGECU 102.

  As shown in FIG. 4, first, in step 200, the MGECU 102 determines whether or not the vehicle air conditioner 1 is performing a cooling operation based on input information from the ACECU 2. If it is determined that the cooling operation is not performed, the process proceeds to step 210. In step 210, it is determined whether or not the vehicle air conditioner 1 is performing a heating operation based on input information from the ACECU 2. If it is determined that the heating operation is not performed, the process proceeds to step 220.

  In step 220, a normal cooling operation mode in which the cooling device 100 performs a normal cooling operation is set. That is, when the vehicle air conditioner 1 is not performing the cooling operation or the heating operation, the normal cooling operation of the cooling device 100 is performed. During the normal cooling operation, the MGECU 102 controls the pump 111 so that the cooling water circulation flow rate in the circulation passage 110 increases as the temperature detected by the temperature sensor 121 increases. The rotational speed control of the pump 111 may be such that the rotational speed is continuously increased as the motor temperature becomes higher, or the rotational speed is increased stepwise.

  During the normal cooling operation in step 220, the rotational speed of the outdoor fan 113 is also controlled by the MGECU 102 so that suitable heat exchange is performed in both the outdoor heat exchanger 13 and the radiator 112 as described above. After step 220 is executed, the process returns to step 200.

  If it is determined in step 200 that the cooling operation is being performed, the process proceeds to step 230. In step 230, it is determined whether or not the current temperature of the motor 120 detected by the temperature sensor 121 exceeds the upper limit of the management temperature. If it is determined in step 230 that the current temperature of the motor 120 exceeds the upper limit of the management temperature, the process proceeds to step 220 and the normal operation cooling mode is set.

  If it is determined in step 230 that the current temperature of the motor 120 does not exceed the upper limit of the management temperature, the process proceeds to step 240. In step 240, based on the input information from DSSECU 150, it is determined whether or not there is no motor output accompanied by a temperature rise until after a predetermined time. Specifically, the vehicle traveling state predicted from the current vehicle position information acquired from the DSSECU 150, the map information of the traveling route direction, the traffic information of the route, and the like is calculated. Then, based on the calculated predicted traveling state, it is predicted whether or not a motor output accompanied by a temperature increase is performed and a state exceeding the upper limit of the management temperature does not occur.

  That is, in step 240, it is determined whether the motor temperature does not exceed the upper limit of the management temperature until a predetermined time has elapsed. In step 240, if it is predicted that the motor temperature will exceed the upper limit of the management temperature by the elapse of a predetermined time, the process proceeds to step 220, and the normal operation cooling mode is set.

  If it is predicted in step 240 that the motor temperature does not exceed the upper limit of the management temperature until a predetermined time has elapsed, the process proceeds to step 250. In step 250, a flow rate suppression operation mode in which the cooling device 100 performs an operation of suppressing the circulating flow rate of the cooling water is set. In step 250, the MGECU 102 controls the rotational speed of the pump 111 to be lower than that in the normal cooling operation.

  That is, when step 250 is executed and the flow rate suppression operation mode is set, the cooling water passage flow rate passing through the radiator 112 is reduced compared to when step 220 is executed and the normal cooling operation mode is set. The pump 111 is controlled. As a result, the outside air temperature around the radiator 112 can be lowered, and the amount of radiant heat from the outer surface of the radiator 112 can also be reduced. Therefore, heat transfer from the radiator 112 to the outdoor heat exchanger 13 that functions as a radiator is suppressed.

  When the flow rate suppression operation mode is set in step 250, the outdoor fan 113 is not controlled in consideration of heat exchange in both heat exchangers in the normal cooling operation mode, but is an outdoor heat exchanger functioning as a radiator. Rotation control giving priority to cooling 13 is performed. In step 250, the rotational speed of the outdoor fan 113 can be increased as compared with the normal cooling operation mode to increase the air flow rate. After executing step 250, the process returns to step 200.

  If it is determined in step 210 that the heating operation is being performed, the process proceeds to step 260. In step 260, it is determined whether or not the current temperature of the motor 120 detected by the temperature sensor 121 exceeds the upper limit of the management temperature. When it is determined in step 260 that the current temperature of the motor 120 exceeds the upper limit of the management temperature, the process proceeds to step 220 and the normal operation cooling mode is set.

  If it is determined in step 260 that the current temperature of the motor 120 does not exceed the upper limit of the management temperature, the process proceeds to step 270. In step 270, based on the input information from DSSECU 150, it is determined whether or not there is no motor output accompanying a temperature increase until after a predetermined time. Specifically, similarly to step 240, the vehicle traveling state predicted from the current vehicle position information acquired from the DSSECU 150, the map information of the traveling route direction, the traffic information of the route, and the like is calculated. Then, based on the calculated predicted traveling state, it is predicted whether or not a motor output accompanied by a temperature increase is performed and a state exceeding the upper limit of the management temperature does not occur. That is, in step 270, it is determined whether the motor temperature does not exceed the upper limit of the management temperature until a predetermined time has elapsed. In step 270, when it is predicted that the motor temperature will exceed the upper limit of the management temperature by the elapse of a predetermined time, the process proceeds to step 220, and the normal operation cooling mode is set.

  If it is predicted in step 270 that the motor temperature does not exceed the upper limit of the management temperature until a predetermined time has elapsed, the process proceeds to step 280. In step 280, a heat transfer promotion operation mode is set in which the cooling device 100 performs an operation for promoting heat transfer from the radiator 112 to the outdoor heat exchanger 13 functioning as an evaporator. In step 280, the MGECU 102 controls the rotational speed of the outdoor fan 113 to be lower than that during the normal cooling operation. That is, when step 280 is executed and the heat transfer promotion operation mode is set, the amount of outside air flowing from the outdoor heat exchanger 13 to the radiator 112 is reduced compared to when the normal cooling operation mode is set in step 220. Thus, the outdoor fan 113 is controlled. This promotes heat transfer from the radiator 112 disposed on the downstream side of the air flow during the normal cooling operation to the outdoor heat exchanger 13 functioning as a heat absorber (evaporator) disposed on the upstream side of the air flow.

  The control of the outdoor fan 113 that reduces the air volume of the outdoor air that flows from the outdoor heat exchanger 13 to the radiator 112 is not limited to the control that reduces the rotational speed of the outdoor fan 113. In step 280, the outdoor fan 113 may be stopped. Thereby, the heat transfer from the radiator 112 to the outdoor heat exchanger 13 that functions as a heat absorber can be further promoted. In step 280, the outdoor fan 113 may be rotated in reverse. Thereby, the heat transfer from the radiator 112 to the outdoor heat exchanger 13 that functions as a heat absorber can be further promoted.

  When the heat transfer promotion operation mode is set in step 280, the MGECU 102 controls the pump 111 so that the number of rotations is higher than that in the normal cooling operation mode. As a result, the amount of heat released from the radiator 112 increases, contributing to the promotion of heat transfer from the radiator 112 to the outdoor heat exchanger 13. After step 280 is executed, the process returns to step 200. The MGECU 102 repeatedly executes the control operation described above at a predetermined cycle according to the flow shown in FIG. The MGECU 102 opens the grille shutter 114 when executing steps 220, 250, and 280.

  According to the cooling device 100 having the above-described configuration and operating, the following effects can be obtained.

  The cooling device 100 is a cooling device mounted on a vehicle that uses a traveling motor 120 as a driving source for traveling, and includes a circulation flow path 110, a radiator 112, a pump 111 as a flow rate adjusting device, and a control device. MGECU102. In the circulation channel 110, a cooling medium for cooling the traveling motor 120, which is a heat generating device, can be circulated. The radiator 112 is provided in the middle of the circulation flow path 110 and is provided to release the heat of the cooling medium to the outside air. The pump 111 as the flow rate adjusting device can adjust the flow rate of the cooling medium passing through the radiator 112. The MGECU 102 as a control device controls the operation of the flow rate adjusting device. A radiator 112 is juxtaposed in the outdoor air circulation direction with respect to the outdoor heat exchanger 13 of the heat pump cycle 10 that circulates refrigerant and air-conditions the interior of the vehicle.

  The control unit MGECU 102 can switch between the normal cooling operation mode and the flow rate suppression operation mode. In the normal cooling operation mode, the MGECU 102 controls the flow rate adjusting device so that the cooling water passage flow rate of the radiator 112 increases as the temperature of the motor 120 increases. When the MGECU 102 predicts that the temperature of the motor 120 does not exceed the upper limit of the management temperature from the current time until a predetermined time elapses when the outdoor heat exchanger 13 functions as a heat radiator that radiates heat from the refrigerant to the outside air. Sets the flow suppression operation mode. When the flow rate suppression operation mode is set, the flow rate adjusting device is controlled so that the radiator 112 cooling water passage flow rate is smaller than that in the normal cooling operation mode.

  According to this, when it is predicted that the temperature of the motor 120 does not exceed the upper limit of the management temperature until a predetermined time has elapsed, the flow rate of the cooling medium passing through the radiator 112 is reduced compared to that in the normal cooling operation when the flow rate suppression mode is set. The Therefore, when the heat pump device performs cooling operation and the outdoor heat exchanger 13 functions as a radiator, the amount of heat released from the radiator 112 is reduced to improve the heat dissipation performance of the outdoor heat exchangers 13 arranged in parallel. Can be made. In this way, it is possible to improve the cooling efficiency when the vehicle interior is cooled.

  The flow rate adjusting device is a pump 111 as a pump device that is provided in the middle of the circulation flow path 110 and can change the circulation flow rate of the cooling medium in the circulation flow path 110. According to this, the flow rate of the cooling medium passing through the radiator 112 can be easily changed by the pump device.

  Further, the radiator 112 is arranged in parallel to the downstream side of the outdoor heat exchanger 13 in the flow direction of the outside air when the normal cooling operation mode is set. According to this, when the amount of heat radiation from the radiator 112 is reduced, the thermal influence on the outdoor heat exchanger 13 functioning as a heat radiator can be easily reduced, and the heat radiation performance can be reliably improved.

  Moreover, MGECU102 which is a control apparatus can set a heat transfer promotion operation mode. When the MGECU 102 functions as a heat absorber that absorbs heat from the outside air to the refrigerant, the MGECU 102 predicts that the temperature of the heat generating device does not exceed the upper limit of the management temperature until a predetermined time elapses from the present time. Set the heat transfer promotion operation mode. When the heat transfer promotion operation mode is set, heat transfer from the radiator 112 to the outdoor heat exchanger 13 is promoted more than in the normal cooling operation mode.

  According to this, when it is predicted that the temperature of the motor 120 does not exceed the management temperature upper limit until a predetermined time elapses, the heat transfer from the radiator 112 to the outdoor heat exchanger 13 is promoted when the heat transfer promotion mode is set. Therefore, when the heat pump device performs heating operation and the outdoor heat exchanger 13 functions as a heat absorber, the amount of heat transferred from the radiator 112 is increased to improve the heat absorption performance of the outdoor heat exchangers 13 arranged in parallel. Can be made. Thus, the heating efficiency at the time of heating a vehicle interior can be improved.

  In addition, the cooling device 100 includes a fan 113 capable of adjusting the amount of outside air flowing through the radiator 112 and the outdoor heat exchanger 13. When the normal cooling operation mode is set, the MGECU 102 as the control device controls the fan 113 so as to adjust the air volume of the outside air according to the temperature of the motor 120 and the state of the refrigerant in the outdoor heat exchanger 13. In addition, when the heat transfer promotion operation mode is set, the fan 113 is controlled so that the amount of outside air flowing from the outdoor heat exchanger 13 to the radiator 112 is reduced compared to the normal cooling operation mode.

  According to this, by controlling the fan 113, it is possible to easily reduce the air volume of the outdoor air from the outdoor heat exchanger 13 toward the radiator 112, and when the outdoor heat exchanger 13 functions as a heat absorber, the outdoor heat from the radiator 112 can be reduced. It is easy to increase the amount of heat transferred to the exchanger 13.

  Further, the MGECU 102 as the control device can stop the fan 113 when the heat transfer promotion operation mode is set. According to this, when the heat transfer promotion operation mode is set, the fan 113 is stopped, and the air volume of the outside air from the outdoor heat exchanger 13 to the radiator 112 can be reliably reduced. Therefore, the amount of heat transferred from the radiator 112 to the outdoor heat exchanger 13 that functions as a heat absorber can be reliably increased.

  Further, the MGECU 102, which is a control device, can rotate the fan 113 in the direction opposite to that when the normal cooling operation mode is set when the heat transfer promotion operation mode is set. According to this, when the heat transfer promotion operation mode is set, the fan 113 is rotated in the reverse direction, so that the air volume of the outside air from the outdoor heat exchanger 13 to the radiator 112 can be more reliably reduced. Therefore, the amount of heat transferred from the radiator 112 to the outdoor heat exchanger 13 functioning as a heat absorber can be more reliably increased.

  Here, with reference to FIG. 5, the operation example of the cooling device 100 when the vehicle air conditioner 1 is performing the cooling operation will be described. As shown in FIG. 5, when the air conditioner switch is turned on and the air conditioner performs cooling operation, for example, when the vehicle is traveling on a congested road and the vehicle speed is low, the motor 120 has a low output. The motor temperature is maintained within the control temperature. Under such conditions, the MGECU 102 sets the cooling device 100 to the flow rate suppression operation mode.

  When the flow rate suppression operation mode is set, the rotation speed of the pump 111 is suppressed to be lower than that during the normal cooling operation mode setting, and the cooling water circulation amount is suppressed. Thereby, the heat radiation from the radiator 112 is suppressed, and the thermal influence on the outdoor heat exchanger 13 functioning as a radiator is suppressed. Thereby, the cooling efficiency of an air conditioner improves. When the flow rate suppression operation mode is set, the rotational speed control of the outdoor fan 113 is performed in a mode that prioritizes heat radiation from the outdoor heat exchanger 13.

  When the flow rate suppression operation mode is set and the input information from the DSSECU 150 predicts that the traffic congestion will be resolved and the average vehicle speed will increase, for example, the MGECU 102 switches the operation mode of the cooling device 100 to the normal cooling operation mode. Specifically, it is predicted that the average vehicle speed will increase, and it has been determined that there is a possibility that the motor temperature will reach the upper limit of the management temperature after a predetermined time since the high motor output state continues. At the timing, the flow control mode is switched to the normal cooling mode. Thereby, the cooling by the cooling device 100 is reliably performed, and the motor temperature is maintained in a stable state.

  Next, with reference to FIG. 6, the operation example of the cooling device 100 when the vehicle air conditioner 1 is performing the heating operation will be described. As shown in FIG. 6, when the air conditioner switch is turned on and the air conditioner performs heating operation, for example, when the vehicle is traveling on a congested road and the vehicle speed is low, the motor 120 has a low output. The motor temperature is maintained within the control temperature. Under such conditions, the MGECU 102 sets the cooling device 100 to the heat transfer promotion operation mode.

  When the heat transfer promotion operation mode is set, the rotational speed of the outdoor fan 113 is suppressed to be lower than when the normal cooling operation mode is set. Thereby, the movement of the heat from the radiator 112 to the outdoor heat exchanger 13 is promoted, and the heat exchange efficiency of the outdoor heat exchanger 13 functioning as a heat absorber increases. Thereby, the heating efficiency of an air conditioner improves. When the heat transfer promotion operation mode is set, the rotation speed of the pump 111 is controlled to be high so as to increase the amount of heat released from the radiator 112.

  At the time of setting the heat transfer promotion operation mode, if it is predicted by the input information from the DSSECU 150 that, for example, the traffic congestion will be resolved and the average vehicle speed will increase, the MGECU 102 switches the operation mode of the cooling device 100 to the normal cooling operation mode. . Specifically, it is predicted that the average vehicle speed will increase, and it has been determined that there is a possibility that the motor temperature will reach the upper limit of the control temperature after a predetermined time after the high motor output state continues. At the timing, the heat transfer promotion operation mode is switched to the normal cooling operation mode. Thereby, the cooling by the cooling device 100 is reliably performed, and the motor temperature is maintained in a stable state.

  Thus, according to the cooling device 100 of the present embodiment, when it is predicted that the state where the motor temperature is within the management temperature range is maintained, the air conditioner even if the motor temperature is relatively high The driving | operation which assists can be performed. If it is predicted that the motor temperature will exceed the control temperature, a normal cooling operation can be performed to prevent overheating of the motor.

(Other embodiments)
The technology disclosed in this specification is not limited to the embodiment for carrying out the disclosed technology, and can be implemented with various modifications. The disclosed technology is not limited to the combinations shown in the embodiments, and can be implemented in various combinations. Embodiments can have additional parts. The portion of the embodiment may be omitted. The parts of the embodiments can be replaced or combined with the parts of the other embodiments. The structure, operation, and effect of the embodiment are merely examples. The technical scope of the disclosed technology is not limited to the description of the embodiments. Some technical scope of the disclosed technology is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. .

  In the said embodiment, although the heat generating apparatus which a cooling device cools was the motor 120 for driving | running | working, it is not limited to this. The heat generating device cooled by the cooling device may be at least one heat generating device among the traveling motor and the related devices related to the traveling motor. Examples of related equipment related to the travel motor include the inverter device 130 and the storage battery 140. When cooling a plurality of heat generating devices, the plurality of heat generating devices can be arranged in series or in parallel with respect to the circulation flow path of the cooling medium.

  Moreover, in the said embodiment, although the cooling device was mounted in the electric vehicle (EV), it is not limited to this. For example, it may be mounted on a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), or the like.

  Moreover, in the said embodiment, although the temperature of the motor 120 which is an example of a heat generating apparatus was detected with the temperature sensor 121 attached to the motor 120, the temperature detection means of a heat generating apparatus is not limited to this. . For example, a sensor that detects the temperature of the cooling medium that flows from the heat generating device to the circulation flow path may be used as the temperature detection means.

  Moreover, in the said embodiment, although the flow volume adjustment apparatus which adjusts the flow volume of the cooling medium which passes a radiator was the pump 111 which changes a rotation speed and adjusts a flow volume, it is not limited to this. The flow rate adjusting device is, for example, a pump device that switches between an on state and an off state, and may adjust the passage flow rate of the cooling medium that passes through the radiator by switching between the on and off states. In addition, a flow path that bypasses the radiator may be provided in the circulation flow path, and a flow rate control valve that can change the ratio between the radiator passing flow rate and the bypass passing flow rate may be used as the flow rate adjusting device.

  Moreover, in the said embodiment, although the outdoor fan 113 was the suction-type fan apparatus provided in the vehicle rear side of the outdoor heat exchanger 13 and the radiator 112, it is not limited to this. For example, a push-in fan device provided on the vehicle front side of the outdoor heat exchanger 13 and the radiator 112 may be used.

  Moreover, in the said embodiment, although the radiator 112 was arranged in parallel with the downstream rather than the outdoor heat exchanger 13 in the distribution direction of external air when a normal cooling operation mode was set, it is limited to this. is not. The radiator may be arranged in parallel to the upstream side of the outdoor heat exchanger in the flow direction of the outside air when the normal cooling operation mode is set. That is, you may arrange | position a radiator in the vehicle forward side rather than an outdoor heat exchanger.

  In this case, when the heat transfer promotion operation mode for promoting the heat transfer from the radiator to the outdoor heat exchanger functioning as the heat sink is set, the radiator goes to the outdoor heat exchanger rather than the normal cooling operation mode. What is necessary is just to control a fan so that the air volume of external air increases.

  In the description of the above embodiment, the case where the control device selectively switches between the normal cooling operation mode, the flow rate suppression operation mode, and the heat transfer promotion operation mode is described, but the present invention is not limited to this. The control device may selectively switch between a normal cooling operation mode and a flow rate suppression operation mode. According to this, it is possible to improve the cooling efficiency of the air conditioner. Further, the control device may selectively switch between the normal cooling operation mode and the heat transfer promotion operation mode. According to this, it is possible to improve the heating efficiency of an air conditioner.

1 Vehicle air conditioner 10 Heat pump cycle (heat pump device)
13 Outdoor heat exchanger 100 Cooling device 102 Motor generator control device (M / GECU, MGECU, control device)
110 Circulating flow path 111 Pump (flow control device)
112 Radiator 120 Motor generator (M / G, travel motor, motor)
130 Inverter device (related equipment)
140 Storage battery (related equipment)

Claims (7)

A cooling device mounted on a vehicle having a traveling motor (120) as a driving source for traveling,
A circulation channel (110) through which a cooling medium for cooling at least one heat generating device (120) among the traveling motor and the related devices (130, 140) related to the traveling motor can be circulated;
A radiator (112) provided in the middle of the circulation flow path for releasing heat of the cooling medium to outside air;
A flow rate adjusting device (111) capable of adjusting a flow rate of the cooling medium passing through the radiator;
A control device (102) for controlling the operation of the flow control device,
The radiator is juxtaposed in the flow direction of the outside air with respect to the outdoor heat exchanger (13) of the heat pump device (10) that circulates the refrigerant and air-conditions the interior of the vehicle.
The controller is
A normal cooling operation mode (220) for controlling the flow rate control device such that the passing flow rate increases as the temperature of the heat generating device increases;
When the outdoor heat exchanger functions as a radiator that radiates heat from the refrigerant to the outside air, when the temperature of the heating device is predicted not to exceed the upper limit of the management temperature until a predetermined time has elapsed from the present time Is a cooling device capable of setting and switching between a flow rate suppression operation mode (250) for controlling the flow rate adjusting device so that the passing flow rate is reduced as compared with the normal cooling operation mode.   The cooling device according to claim 1, wherein the flow rate adjusting device is a pump device that is provided in the middle of the circulation flow path and can change a circulation flow rate of the cooling medium in the circulation flow path.   The cooling device according to claim 1 or 2, wherein the radiator is arranged in parallel to the downstream side of the outdoor heat exchanger in the flow direction of the outside air when the normal cooling operation mode is set. . The controller is
When the outdoor heat exchanger functions as a heat absorber that absorbs heat from the outside air to the refrigerant, when the temperature of the heat generating device is predicted not to exceed the upper limit of the management temperature until a predetermined time elapses from the current time The cooling device according to claim 3, wherein a heat transfer promotion operation mode (280) that promotes heat transfer from the radiator to the outdoor heat exchanger can be set as compared with the normal cooling operation mode. A fan (113) capable of adjusting the air volume of the outside air flowing through the radiator and the outdoor heat exchanger;
The controller is
When the normal cooling operation mode is set, the fan is controlled to adjust the air volume of the outside air according to the temperature of the heat generating device and the state of the refrigerant of the outdoor heat exchanger,
The fan is controlled such that when the heat transfer promotion operation mode is set, the air volume of the outside air from the outdoor heat exchanger to the radiator is reduced compared to the normal cooling operation mode. The cooling device as described. The controller is
The cooling device according to claim 5, wherein the fan is stopped when the heat transfer promotion operation mode is set. The controller is
The cooling device according to claim 5, wherein when the heat transfer promotion operation mode is set, the fan is rotated in a direction opposite to that when the normal cooling operation mode is set.

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