JP6512158B2 - Vehicle cooling system - Google Patents

Description

  The present invention relates to a cooling system for cooling a device to be cooled of a vehicle.

  Conventionally, Patent Document 1 describes a thermal energy control system including a high water temperature cooling cycle and a low water temperature cooling cycle. In this prior art, a high water temperature radiator, a low water temperature radiator, a circulation pump, and a flow path switching control valve are provided. Each radiator has a first passage and a second passage.

  In the low temperature cooling cycle, cooling water is circulated by the circulation pump, and heat exchange is performed by the cooling water and the cooling air flowing through the first passage and the second passage of the low water temperature radiator. The low temperature radiator is disposed in front of the engine room of the vehicle.

  In a general vehicle, an upper grille and a lower grille are provided at the front of the vehicle body, and outside air is introduced from the upper grille and the lower grille to a radiator and other heat exchangers and flows into the engine room. The upper grille is disposed near the front end of the engine hood. The lower grille is integrally formed with the front bumper below the upper grille.

  In recent years, in some vehicles, an upper grille or a lower grille is provided with an outdoor air shut mechanism for the purpose of improving fuel consumption. And, especially when traveling at high speed, by closing the shut mechanism and restricting the inflow of air into the engine room, it is possible to improve its aerodynamic performance (for example, "Cd value" etc.), and therefore the running resistance of the vehicle It is possible to reduce the fuel consumption.

Japanese Patent Application Publication No. 2008-525701

  When the prior art of Patent Document 1 is applied to a vehicle in which the lower grille is provided with the shutter mechanism, the first passage of the low temperature radiator faces the upper grille, and the second passage of the low temperature radiator faces the lower grille. It will be. Therefore, when the shut mechanism is closed, outside air hardly flows in the second passage of the low temperature radiator.

  However, in the prior art of Patent Document 1, since the cooling water always flows in both the first passage and the second passage of the low temperature radiator, when the shutter mechanism is closed, most of the open air is in the second passage. Although it does not flow, the waste that a cooling water (in other words, a heat carrier) flows will occur.

  An object of the present invention is to efficiently flow a heat medium to a radiator in view of the above-mentioned point.

In order to achieve the above object, in a vehicle cooling system according to claim 1,
Cooled equipment (32, 33, 34) cooled by the heat medium;
A first radiator (11) and a second radiator (12) for exchanging heat between the heat transfer medium and the outside air introduced from the opening (21, 22) of the vehicle;
An opening area adjustment unit (23) for adjusting the opening area of the opening;
A flow rate ratio adjusting unit (35) for adjusting a flow rate ratio between the heat medium flowing through the first radiator and the heat medium flowing through the second radiator;
A control unit (60) for controlling the operation of the flow rate adjustment unit in accordance with the operation state of the opening area adjustment unit ;
The control unit controls the opening area adjustment unit such that the introduction of the outside air to one of the first and second radiators is suppressed when the traveling speed of the vehicle exceeds the predetermined speed, and the one radiator is The flow rate adjustment unit is controlled so that the flow rate of the flowing heat medium decreases.

  According to this, the flow rate ratio of the heat medium to the first radiator (11) and the second radiator (12) is changed according to the introduction state of the outside air to the first radiator (11) and the second radiator (12) Can. Therefore, the heat medium can be efficiently flowed through the first radiator (11) and the second radiator (12).

Moreover, it can suppress that a cooling water flows uselessly to the radiator by which introduction | transduction of external air is suppressed.
In order to achieve the above object, in the vehicle cooling system according to claim 3,
Cooled equipment (32, 33, 34) cooled by the heat medium;
A first radiator (11) and a second radiator (12) for exchanging heat between the heat transfer medium and the outside air introduced from the opening (21, 22) of the vehicle;
An opening area adjustment unit (23) for adjusting the opening area of the opening;
A flow rate ratio adjusting unit (35) for adjusting a flow rate ratio between the heat medium flowing through the first radiator and the heat medium flowing through the second radiator;
A control unit (60) for controlling the operation of the flow rate adjustment unit in accordance with the operation state of the opening area adjustment unit;
The control unit decreases the flow rate of the heat medium flowing through one of the radiators when the opening area adjustment unit is operated so as to suppress the introduction of the outside air to one of the first and second radiators. To control the operation of the flow rate adjustment unit,
The control unit controls the operation of the opening area adjustment unit such that the introduction of outside air to one of the radiators is suppressed when the traveling speed of the vehicle exceeds a predetermined speed,
Comparing the characteristics of the heat exchange amount of the first radiator and the second radiator, when the speed of the outside air flowing in exceeds the predetermined speed, the heat exchange amount of the other radiator is more than the heat exchange amount of one radiator The first and second radiators are formed to increase the number.
Thereby, the same operation and effect as the vehicle cooling system according to claim 1 can be obtained.

  In addition, the code | symbol in the parenthesis of each means described by this column and the claim shows correspondence with the specific means as described in embodiment mentioned later.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the vehicle by which the cooling system for vehicles in one Embodiment is mounted, and the shutter mechanism has shown the closed state. BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the cooling system for vehicles in one Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the vehicle by which the cooling system for vehicles in one Embodiment is mounted, and the state where the shutter mechanism was opened is shown. It is a front view of the 1st radiator in one embodiment, and the 2nd radiator. It is a front view of the 1st radiator in the modification of one embodiment, and the 2nd radiator. It is a front view of the 1st radiator in the modification of one embodiment, and the 2nd radiator. FIG. 1 is a cross-sectional view of a tube in one embodiment. It is sectional drawing of the tube in the modification of one Embodiment. It is sectional drawing of the tube in the modification of one Embodiment. It is a schematic diagram of the 1st radiator in one embodiment, and the 2nd radiator. It is a schematic diagram of the 1st radiator in the modification of one embodiment, and the 2nd radiator. It is a schematic diagram of the 1st radiator in the modification of one embodiment, and the 2nd radiator.

  Hereinafter, an embodiment of a cooling system for a vehicle will be described based on the drawings. Arrows in the upper, lower, front, and back directions in FIG. 1 indicate the respective directions in the upper, lower, front, and back directions in the vehicle on which the vehicle cooling system is mounted.

  As shown in FIG. 1, the first low temperature radiator 11, the second low temperature radiator 12, the engine cooling radiator 13 and the blower 14 are disposed at the front of the engine room 15 of the vehicle.

  The first low temperature radiator 11, the second low temperature radiator 12, the engine cooling radiator 13 and the blower 14 constitute an integral assembly structure. That is, the first low temperature radiator 11, the second low temperature radiator 12, the engine cooling radiator 13 and the blower 14 constitute a cooling module.

  The first low temperature radiator 11, the second low temperature radiator 12 and the engine cooling radiator 13 are incorporated in a common front end panel 16. The front end panel 16 supports the surroundings of the first low temperature radiator 11, the second low temperature radiator, and the engine cooling radiator 13, and also the air flow passing through the first low temperature radiator 11, the second low temperature radiator 12, and the engine cooling radiator 13. Is a member for guiding the

  The first low-temperature radiator 11 and the second low-temperature radiator 12 are heat exchangers that exchange heat between the cooling water of the low-temperature cooling water circuit 30 shown in FIG. 2 and air outside the passenger compartment (hereinafter referred to as outside air). The engine cooling radiator 13 is a heat exchanger that exchanges heat between the cooling water of the engine cooling water circuit 40 shown in FIG. 2 and the outside air.

  The engine cooling radiator 13 is disposed downstream of the first low temperature radiator 11 and the second low temperature radiator 12 in the flow of the outside air. That is, the engine cooling radiator 13 is disposed on the vehicle rear side of the first low temperature radiator 11 and the second low temperature radiator 12.

  The low temperature cooling water circuit 30 and the engine cooling water circuit 40 are cooling water circulation circuits in which the cooling water circulates. The low temperature coolant circuit 30 and the engine coolant circuit 40 are coolant circuits independent of each other.

  Cooling water is a fluid as a heat carrier. For example, the cooling water is ethylene glycol antifreeze (so-called LLC).

  The blower 14 is a blower that blows air toward the first low temperature radiator 11, the second low temperature radiator, and the engine cooling radiator 13. The blower 14 is an electric blower which drives an axial flow fan by an electric motor.

  A bumper reinforcement 17 and a bumper cover 18 are disposed at the front end of the engine compartment 15. The bumper reinforcement 17 is a beam-like member that extends in the vehicle width direction at the front end of the vehicle and absorbs the collision force from the front side of the vehicle. The bumper cover 18 is disposed on the front side of the bumper reinforcement 17. The bumper cover 18 is a component made of resin that covers the front side of the bumper reinforcement 17.

  The top opening of the engine compartment 15 is closed by an engine hood 19. An undercover 20 is disposed below the engine compartment 15.

  An upper opening 21 is provided on the upper side of the bumper reinforcement 17. A lower side opening 22 is provided below the bumper reinforcement 17. The upper side opening 21 and the lower side opening 22 are outside air inlets for introducing the outside air into the first low temperature radiator 11, the second low temperature radiator and the engine cooling radiator 13 in the engine room 15.

  The first low-temperature radiator 11 is disposed in the engine compartment 15 at a position facing the upper opening 21. The second low temperature radiator 12 is disposed in the engine compartment 15 at a position facing the lower opening 22.

  A shutter mechanism 23 is disposed in the lower opening 22. The shutter mechanism 23 is an introduction air volume adjustment unit that adjusts the air volume of the air introduced from the lower opening 22 by opening and closing the lower opening 22.

  The shutter mechanism 23 is an opening area adjustment unit that adjusts the opening area of the lower side opening 22. In other words, the shutter mechanism 23 adjusts the opening area of the portion of the upper opening 21 and the lower opening 22 facing the second low temperature radiator 12.

  The shutter mechanism 23 has a plurality of plate doors. The shutter mechanism 23 is rotationally displaced by being driven by the electric actuator 24 shown in FIG. The lower opening 22 is opened and closed as the electric actuator 24 rotates and displaces the plurality of plate doors in an interlocking manner.

  FIG. 1 shows a state in which the shutter mechanism 23 closes the lower side opening 22. FIG. 3 shows a state in which the shutter mechanism 23 opens the lower side opening 22.

  The shutter mechanism 23 closes the lower side opening 22 when traveling at high speed (for example, when traveling at 80 km / h or more). Thereby, aerodynamic performance (for example, "Cd value" etc.) at the time of high speed traveling is improved. When the shutter mechanism 23 closes the lower side opening 22, the outside air is not introduced from the lower side opening 22, so the outside air hardly flows through the second low temperature radiator 12.

  The shutter mechanism 23 opens the lower side opening 22 except during high-speed travel and low ambient temperature. When the shutter mechanism 23 opens the lower side opening 22, the outside air is introduced from the lower side opening 22, so the outside air flows to the second low temperature radiator 12.

  In the example of FIG. 1, the bumper reinforcement 25 is disposed in the vicinity of the undercover 20.

  As shown in FIG. 2, the first low temperature radiator 11 and the second low temperature radiator 12 are arranged in parallel with each other in the cooling water flow of the low temperature cooling water circuit 30. The first low temperature radiator 11 is a first radiator of the low temperature coolant circuit 30. The second low temperature radiator 12 is a second radiator of the low temperature coolant circuit 30.

  In the low temperature cooling water circuit 30, a low temperature cooling water pump 31, a turbocharger 32, an intercooler 33, a refrigerant radiator 34, a first switching valve 35, and a second switching valve 36 are disposed.

  The low temperature cooling water pump 31 is an electric pump that sucks in and discharges the cooling water of the low temperature cooling water circuit 30. The turbocharger 32, the intercooler 33 and the refrigerant radiator 34 are equipment to be cooled that is cooled by the cooling water of the low temperature cooling water circuit 30.

  The turbocharger 32 is a supercharger that supercharges the intake of the engine 41. The intercooler 33 is an intake air cooler which exchanges heat between the supercharged intake air and the cooling water which are compressed by the turbocharger 32 and become high temperature to cool the supercharged intake air.

  The turbocharger 32 and the intercooler 33 are arranged in parallel with each other in the cooling water flow of the low temperature cooling water circuit 30. Furthermore, the turbocharger 32 and the intercooler 33 are disposed in parallel with the refrigerant radiator 34 in the cooling water flow of the low temperature cooling water circuit 30.

  The refrigerant radiator 34 is a heat exchanger that exchanges heat between the high temperature high pressure refrigerant of the refrigeration cycle 50 and the cooling water of the low temperature cooling water circuit 30 to cool the refrigerant. The refrigeration cycle 50 includes a compressor 51, a refrigerant radiator 34, an expansion valve 52, and an evaporator 53.

  The compressor 51 sucks and compresses the low pressure refrigerant of the refrigeration cycle 50 and discharges the high pressure refrigerant. The refrigerant radiator 34 exchanges heat between the high pressure refrigerant discharged by the compressor 51 and the cooling water of the low temperature cooling water circuit 30 to cool the high pressure refrigerant. The expansion valve 52 is a pressure reducing unit that decompresses and expands the high pressure refrigerant cooled by the refrigerant radiator 34. The evaporator 53 is an air conditioning heat exchanger that exchanges heat between the low pressure refrigerant decompressed by the expansion valve 52 and the air blown into the vehicle compartment to cool the air blown into the vehicle compartment.

  The first switching valve 35 is a flow rate adjustment unit that adjusts the flow rate ratio of the cooling water flowing through the first low temperature radiator 11 and the cooling water flowing through the second low temperature radiator 12. The first switching valve 35 is disposed at a branch portion of the cooling water flow passage on the first low temperature radiator 11 side and the cooling water flow passage on the second low temperature radiator 12 side. The first switching valve 35 is an electromagnetic valve that opens and closes the cooling water flow passage on the second low temperature radiator 12 side.

  When the first switching valve 35 opens the cooling water flow path on the second low temperature radiator 12 side, the cooling water flows to both the first low temperature radiator 11 and the second low temperature radiator 12. When the first switching valve 35 closes the cooling water flow path on the second low temperature radiator 12 side, the cooling water flows to the first low temperature radiator 11 and the cooling water does not flow to the second low temperature radiator 12.

  The second switching valve 36 is a flow rate ratio adjusting unit that adjusts the flow rate ratio of the cooling water flowing through the turbocharger 32 and the intercooler 33 and the cooling water flowing through the refrigerant radiator 34.

  The second switching valve 36 is disposed at a branch portion of the cooling water flow passage on the turbocharger 32 and the intercooler 33 side and the cooling water flow passage on the refrigerant radiator 34 side. The second switching valve 36 is an electromagnetic valve that opens and closes the cooling water flow passage on the turbocharger 32 and the intercooler 33 side.

  When the second switching valve 36 opens the cooling water flow path on the turbocharger 32 and intercooler 33 side, the cooling water flows to the turbocharger 32, the intercooler 33 and the refrigerant radiator 34. When the second switching valve 36 closes the cooling water flow path on the turbocharger 32 and intercooler 33 side, the cooling water flows through the refrigerant radiator 34 and the cooling water does not flow through the turbocharger 32 and the intercooler 33.

  In the engine coolant circuit 40, an engine 41 and an engine coolant pump 42 are disposed. The engine cooling water pump 42 is a pump that sucks in and discharges the cooling water of the engine cooling water circuit 40. The engine coolant pump 42 is a belt drive pump driven by transmitting power of the driving force of the engine 41 through a belt. The engine coolant pump 42 may be an electric pump.

  The operations of the electric actuator 24 for driving the shutter mechanism 23, the low temperature coolant pump 31, the first switching valve 35, the second switching valve 36 and the blower 14 are controlled by a control signal output from the control device 60.

  The control device 60 is composed of a known microcomputer including a CPU, a ROM, a RAM and the like and its peripheral circuits, performs various operations and processes based on a control program stored in the ROM, and is connected to the output side Control the operation of the device.

  The control device 60 is a control unit that controls the operation of various control devices that constitute the vehicle cooling system. When the occupant turns on the ignition switch of the vehicle, the control device 60 is supplied with power from a battery (not shown) and starts up.

  At the output side of the control device 60, an electric actuator 24, which drives the shutter mechanism 23, a low temperature coolant pump 31, a first switching valve 35, a second switching valve 36, and an engine coolant pump 42 are connected.

  A sensor group such as a vehicle speed sensor 61, an outside air temperature sensor 62, an intake air temperature sensor 63, and a refrigerant pressure sensor 64 are connected to the input side of the control device 60.

  The vehicle speed sensor 61 is a traveling speed detection unit that detects the traveling speed of the vehicle. The outside air temperature sensor 62 is an outside air temperature detection unit that detects the temperature outside the vehicle compartment (that is, the outside air temperature) Tam. The intake sensor 63 is an intake air temperature detection unit that detects the temperature of the intake air flowing into the intercooler 33. The intake sensor 63 may be an intake pressure detection unit that detects the pressure of intake air flowing into the intercooler 33.

  The refrigerant pressure sensor 64 is a refrigerant pressure detection unit that detects the pressure of the refrigeration cycle (not shown). For example, the refrigerant pressure sensor 64 detects the pressure of the refrigerant that is discharged from the compressor 51 of the refrigeration cycle 50 and flows into the refrigerant radiator 34.

  As shown in FIG. 4, the first low temperature radiator 11 and the second low temperature radiator 12 are separated from each other. The first low temperature radiator 11 and the second low temperature radiator 12 have the same frontal area.

  As shown in the modification of FIG. 5, the first low temperature radiator 11 and the second low temperature radiator 12 may be integrated with each other.

  As shown in the modification of FIG. 6, the first low temperature radiator 11 and the second low temperature radiator 12 may have different frontal areas. In the example of FIG. 6, the front area of the first low temperature radiator 11 is larger than the front area of the second low temperature radiator 12, but the front area of the second low temperature radiator 12 is larger than the front area of the first low temperature radiator 11 It may be bigger.

  The first low-temperature radiator 11 and the second low-temperature radiator 12 have core portions 11a and 12a and tanks 11b, 11c, 12b and 12c, respectively. The core portions 11a and 12a are heat exchange portions that exchange heat between cooling water and air. The core portions 11a and 12a are formed in a substantially rectangular shape. The core portions 11a and 12a have a large number of tubes and fins.

  The tube is a pipe through which cooling water flows. A large number of tubes are arranged parallel to one another. The fins are joined to the flat surface of the tube. The fins are heat exchange promoting members that increase the heat transfer area to promote heat exchange between the refrigerant and the air. For example, the fins are corrugated fins shaped in a wave shape.

  As shown in FIG. 7, the tube TB is a flat tube formed in a flat shape. The tubes are arranged such that the flat surface is in the air flow direction.

  The tanks 11b, 11c, 12b and 12c are joined to both ends of the tube TB. The tanks 11b, 11c, 12b, 12c distribute and assemble cooling water to a large number of tubes TB.

  In the example of FIG. 7, the tube TB is a flat tube. As shown in the modification of FIG. 8, the tube may be an inner fin tube having an inner fin IF. As shown in the modification of FIG. 9, the tube may be a dimpled tube in which dimples DP are formed.

  As shown in FIG. 10, in the core portions 11a and 12a of the first low-temperature radiator 11 and the second low-temperature radiator 12, the cooling water flows from one tank 11b, 11c, 12b, 12c to the other tank 11b, 11c, 12b, It flows in one direction toward the 12c side.

  As shown in the modification of FIG. 11, in the core portions 11a and 12a of the first low temperature radiator 11 and the second low temperature radiator 12, the cooling water is directed from one tank 11b, 11c, 12b and 12c to the other tank It may flow, and it may make a U-turn with the other tank 11b, 11c, 12b, 12c, and may flow toward one tank 11b, 11c, 12b, 12c side.

  As shown in the modification of FIG. 12, the cooling water U-turns and flows in the core portions 11 a and 12 a of the first low temperature radiator 11, and the cooling water flows in one direction in the core portions 11 a and 12 a of the second low temperature radiator 12. May be

  The performance characteristics of the first low temperature radiator 11 and the second low temperature radiator 12 are different from each other. Specifically, when the wind speed of the inflowing external air is in the high wind speed region, the first low temperature radiator 11 and the first low temperature radiator 11 and the first low temperature radiator 11 are larger than the heat exchange amount of the second low temperature radiator 12. 2 Low temperature radiator 12 is formed.

  The high wind speed range is the wind speed range (for example, about 80 km) of the outside air flowing into the first low temperature radiator 11 during high speed traveling (for example, traveling at 80 km / h or more) closing the lower opening 22 by the shutter mechanism 23. / H or more).

 In addition, when the wind speed of the inflowing external air is in the low speed region, the first low temperature radiator 11 and the second low temperature radiator 12 so that the heat exchange amount of the second low temperature radiator 12 becomes larger than the heat exchange amount of the first low temperature radiator 11 Is formed.

  Specifically, in the first low-temperature radiator 11, the air-side contribution to cooling is greater than in the second low-temperature radiator 12, and in the second low-temperature radiator 12, the cooling-water contribution to cooling is the first low-temperature radiator 11 The first low-temperature radiator 11 and the second low-temperature radiator 12 are formed to be larger than the above.

  For example, by making the number of fin louvers of the first low temperature radiator 11 more than the number of fin louvers of the second low temperature radiator 12, the air side contribution to the cooling of the first low temperature radiator 11 is compared with the second low temperature radiator 12. Can be enlarged.

  For example, by making the fin pitch of the first low temperature radiator 11 smaller than the fin pitch of the second low temperature radiator 12, the air side contribution to the cooling of the first low temperature radiator 11 is large compared to the second low temperature radiator 12. it can.

  For example, by providing the inner fins and dimples in the tube of the second low temperature radiator 12 without providing the inner fins and dimples in the tube of the first low temperature radiator 11, the degree of contribution of the cooling water side to the cooling of the second low temperature radiator 12 It can be larger than the first low temperature radiator 11.

  For example, by making the outside air flow direction width dimension of the tube of the first low temperature radiator 11 larger than the outside air flow direction width dimension of the tube of the second low temperature radiator 12, the degree of contribution of the cooling water side to the cooling of the second low temperature radiator 12 As compared to the first low temperature radiator 11.

  Next, the operation in the above configuration will be described. The control device 60 controls the operation of the shutter driving electric actuator 24, the first switching valve 35, and the second switching valve 36 in accordance with the traveling scene.

  For example, when the engine 41 is in an idle state or when traveling in an urban area, for example, the shutter mechanism 23 opens the lower opening 22 and the first switching valve 35 is a cooling water flow on the second low temperature radiator 12 side. The path is opened, and the second switching valve 36 closes the cooling water flow path on the turbocharger 32 and the intercooler 33 side.

  At this time, the blower 14 is operated to blow the outside air. When the engine 41 is in the idle state, the traveling wind can not be obtained, and the traveling wind obtained when traveling in a city area is small.

  Thereby, the outside air is introduced from both the upper side opening 21 and the lower side opening 22, and the cooling water of the low temperature cooling water circuit 30 flows to the first low temperature radiator 11, the second low temperature radiator 12 and the refrigerant radiator 34. Even if the cooling water of the low temperature cooling water circuit 30 does not flow to the turbocharger 32 and the intercooler 33, or even if the cooling water of the low temperature cooling water circuit 30 flows to the turbocharger 32 and the intercooler 33, the necessary flow rate is obtained.

  That is, in the low temperature cooling water circuit 30, the refrigerant radiator 34 dissipates heat from the high temperature refrigerant of the refrigeration cycle to the cooling water, and the first low temperature radiator 11 and the second low temperature radiator 12 dissipate the heat from the cooling water to the outside air. Therefore, the cooling performance of the air in the evaporator 53 of the refrigeration cycle can be secured. In other words, air conditioning performance can be secured.

  When the engine 41 is idle or traveling in a city area, the intake air is hardly charged by the turbocharger 32. Therefore, there is no problem even if the coolant does not flow to the turbocharger 32 and the intercooler 33. .

  For example, when the control device 60 is in a high load engine operating condition such as low speed climb or pulling, the shutter mechanism 23 opens the lower side opening 22 and the first switching valve 35 is on the second low temperature radiator 12 side. The second switching valve 36 opens the cooling water flow path on the turbocharger 32 and intercooler 33 side.

  Thus, the outside air is introduced from both the upper side opening 21 and the lower side opening 22, and the low temperature cooling water is supplied to the first low temperature radiator 11, the second low temperature radiator 12, the refrigerant radiator 34, the turbocharger 32 and the intercooler 33. Cooling water of the circuit 30 flows.

  That is, in the low temperature cooling water circuit 30, the refrigerant radiator 34 dissipates heat from the high temperature refrigerant of the refrigeration cycle to the cooling water, dissipates heat from the turbocharger 32 to the cooling water, and dissipates the supercharged intake air to the cooling water from the intercooler 33. Heat is dissipated from the cooling water by the first low temperature radiator 11 and the second low temperature radiator 12.

  Therefore, the turbocharger 32 and the supercharged intake can be reliably cooled at the time of low-speed climb and traction where the supercharger of the intake is performed by the turbocharger 32. Moreover, the cooling performance of the air in the evaporator 53 of a refrigerating cycle is securable. In other words, air conditioning performance can be secured.

  In addition, since the outside air introduced from both the upper opening 21 and the lower opening 22 flows through the engine cooling radiator 13, the engine 41 can be sufficiently operated even during low speed climb or traction where engine load is high. Can be cooled.

  For example, when the control device 60 is traveling at high speed, the shutter mechanism 23 closes the lower side opening 22 and the first switching valve 35 closes the cooling water flow path on the second low temperature radiator 12 side, and the second switching valve 36 Opens the cooling water flow path on the turbocharger 32 and the intercooler 33 side.

  As a result, the outside air is not introduced from the lower side opening 22, and the cooling water of the low temperature cooling water circuit 30 flows to the first low temperature radiator 11, the refrigerant radiator 34, the turbocharger 32 and the intercooler 33. In the low temperature cooling water circuit 30, the cooling water does not flow.

  That is, since the outside air does not flow from the lower opening 22 into the engine room 15, the air resistance coefficient of the vehicle is reduced, and the fuel efficiency is improved.

  Since the outside air is not introduced from the lower side opening 22, the outside air hardly flows to the second low temperature radiator 12. Therefore, since the cooling water is prevented from flowing to the second low temperature radiator 12, it is possible to prevent the cooling water from flowing to the second low temperature radiator 12 in vain.

  At this time, the rotational speed of the low temperature coolant pump 31 is controlled to be low so that the flow rate of the coolant flowing through the first low temperature radiator 11 does not become excessive. Thereby, the power consumption of the low temperature cooling water pump 31 can be reduced.

  Further, in the low temperature cooling water circuit 30, the refrigerant radiator 34 dissipates heat from the high temperature refrigerant of the refrigeration cycle to the cooling water, dissipates heat from the turbocharger 32 to the cooling water, and dissipates the supercharged intake air to the cooling water from the intercooler 33. The first low temperature radiator 11 dissipates heat from the cooling water to the outside air.

  Since the vehicle is traveling at high speed, the wind speed of the outside air flowing into the first low temperature radiator 11 is in the high speed region. As described above, when the wind speed of the inflowing external air is in the high wind speed region, the first low temperature radiator 11 is formed such that the heat exchange amount of the first low temperature radiator 11 is increased.

  Therefore, the turbocharger 32 and the supercharged intake can be reliably cooled during high speed traveling where the supercharger 32 performs supercharging of the intake. Moreover, the cooling performance of the air in the evaporator 53 of a refrigerating cycle is securable. In other words, air conditioning performance can be secured.

  Further, in the engine cooling water circuit 40, the heat is radiated from the engine 41 to the cooling water, and the radiator for engine cooling is radiated from the cooling water to the outside air, so that the engine 41 can be cooled.

  For example, when it is a cold time when the engine 41 is idled up and warmed up, the control device 60 operates the shutter mechanism 23, the first switching valve 35, and the second switching valve 36 in the same manner as when traveling at high speed. Control.

  As a result, the outside air is not introduced from the lower side opening 22, so the volume of the outside air flowing through the engine cooling radiator 13 is reduced. Therefore, the amount of heat radiated from the cooling water to the outside air in the engine cooling radiator 13 decreases, so the temperature of the cooling water of the engine cooling water circuit 40 can be raised early to warm up the engine 41 early. .

  Since the outside air is not introduced from the lower side opening 22, the outside air hardly flows to the second low temperature radiator 12. Therefore, since the cooling water is prevented from flowing to the second low temperature radiator 12, it is possible to prevent the cooling water from flowing to the second low temperature radiator 12 in vain.

  At this time, the rotational speed of the low temperature coolant pump 31 is controlled to be low so that the flow rate of the coolant flowing through the first low temperature radiator 11 does not become excessive. Thereby, the power consumption of the low temperature cooling water pump 31 can be reduced.

  Thus, by switching the flow of the cooling water to the first low-temperature radiator 11 and the second low-temperature radiator 12 according to the traveling scene, the to-be-cooled devices 32, 33, 34 can be appropriately cooled as needed. .

  In other words, the heat exchange capabilities of the first low-temperature radiator 11 and the second low-temperature radiator 12 can be appropriately adjusted to efficiently cool the devices to be cooled 32, 33, 34.

  In addition, since the devices to be cooled 32, 33, 34 can be cooled efficiently, the degree of freedom in design of the openings 21, 22 of the vehicle can be improved.

  In the present embodiment, the control device 60 controls the operation of the first switching valve 35 in accordance with the operation state of the shutter mechanism 23.

  According to this, it is possible to change the flow rate ratio of the cooling water with respect to the first low temperature radiator 11 and the second low temperature radiator 12 according to the introduction state of the outside air to the first low temperature radiator 11 and the second low temperature radiator 12. Therefore, the cooling water can be efficiently flowed to the first low temperature radiator 11 and the second low temperature radiator 12.

  Specifically, the control device 60 reduces the flow rate of the cooling water flowing through the second low-temperature radiator 12 when the shutter mechanism 23 operates so that the introduction of the outside air to the second low-temperature radiator 12 is suppressed. Thus, the operation of the first switching valve 35 is controlled.

  According to this, it is possible to suppress the wasteful flow of the cooling water to the second low temperature radiator 12 in which the introduction of the outside air is suppressed.

  The control device 60 controls the operation of the shutter mechanism 23 such that the introduction of outside air to the second low temperature radiator 12 is suppressed when the traveling speed of the vehicle exceeds a predetermined speed. Then, comparing the characteristics of the heat exchange amount of the first low temperature radiator 11 and the second low temperature radiator 12, when the speed of the outside air flowing in exceeds the predetermined speed, the first heat exchange amount of the second low temperature radiator 12 The first low temperature radiator 11 and the second low temperature radiator 12 are formed such that the heat exchange amount of the low temperature radiator 11 is larger.

  According to this, when the shutter mechanism 23 suppresses the introduction of the outside air to the second low temperature radiator 12, the heat exchange amount of the first low temperature radiator 11 can be increased. Therefore, even when the introduction of the outside air to the second low temperature radiator 12 is suppressed, it is possible to suppress an insufficient amount of heat exchange between the cooling water of the low temperature cooling water circuit 30 and the outside air.

  Specifically, when the shutter mechanism 23 is operated so that the lower opening 22 is closed, the control device 60 may block the flow of the cooling water with respect to the second low temperature radiator 12. 1) Control the operation of the switching valve 35.

  According to this, when the lower side opening part 22 is obstruct | occluded and external air is hardly introduce | transduced into the 2nd low temperature radiator 12, it can suppress that a cooling water flows into the 2nd low temperature radiator 12 uselessly.

  In the present embodiment, the first low temperature radiator 11 and the second low temperature radiator 12 are arranged in parallel with each other in the flow of the cooling water. And the 1st switching valve 35 is a valve | bulb arrange | positioned at the branch part which branches the flow of a cooling water to the 1st low temperature radiator 11 side and the 2nd low temperature radiator 12 side.

  According to this, the flow rate ratio of the cooling water to the first low temperature radiator 11 and the second low temperature radiator 12 can be changed with a simple configuration.

(Other embodiments)
The above embodiment can be variously modified as follows, for example.

  (1) In the above embodiment, the shutter mechanism 23 opens and closes the lower side opening 22. However, even if the shutter mechanism 23 is configured to arbitrarily adjust the opening degree of the lower side opening 22 Good.

  (2) In the above embodiment, the shutter mechanism 23 is disposed in the lower opening 22, but the shutter mechanism 23 may be disposed in the upper opening 21. In this case, when the shutter mechanism 23 is closed, the control device 60 controls the operation of the first switching valve 35 so that the cooling water flow path on the first low temperature radiator 11 side is closed and the cooling water does not flow to the first low temperature radiator 11 do it.

  (3) In the above embodiment, the first low temperature radiator 11 is disposed above the second low temperature radiator 12, but the first low temperature radiator 11 is disposed below the second low temperature radiator 12. It is also good.

  (4) In the said embodiment, although the 1st switching valve 35 is arrange | positioned at the branch part of the cooling water flow path by the side of the 1st low temperature radiator 11 and the cooling water flow path by the side of the 2nd low temperature radiator 12, The valve 35 may be disposed at the junction of the cooling water flow passage on the first low temperature radiator 11 side and the cooling water flow passage on the second low temperature radiator 12 side.

  That is, in the above embodiment, the first switching valve 35 is disposed upstream of the cooling water flow of the first low temperature radiator 11 and the second low temperature radiator 12. However, the first switching valve 35 is the first low temperature radiator 11. And may be disposed downstream of the coolant flow of the second low-temperature radiator 12.

  (5) In the above embodiment, the cooling water flow rate ratio of the first low temperature radiator 11 and the second low temperature radiator 12 is adjusted by the first switching valve 35, but the cooling water flow rate of the first low temperature radiator 11 and the second low temperature radiator 12 The proportion may be adjusted by a pump.

  That is, the pump for the first low-temperature radiator 11 and the pump for the second low-temperature radiator 12 are separately provided, and the rotational speeds of these pumps are independently controlled, thereby the first low-temperature radiator 11 and the second low-temperature radiator The cooling water flow rate ratio of 12 may be adjusted.

  (6) In the above embodiment, the equipment to be cooled which is cooled by the cooling water of the low temperature cooling water circuit 30 is the turbocharger 32, the intercooler 33 and the refrigerant radiator 34, but the equipment to be cooled is a battery, an inverter and oil It may be a cooler or the like.

  The battery is a storage battery that stores the electric power generated by the generator of the vehicle and supplies the electric power to various in-vehicle devices. When the equipment to be cooled is a battery, it is preferable that a temperature sensor for detecting the temperature of the cooling water flowing into the battery be connected to the input side of the control device 60.

  The inverter is a power converter that converts DC power supplied from a battery into AC power. When the equipment to be cooled is an inverter, it is preferable that a temperature sensor for detecting the temperature of the cooling water flowing into the inverter is connected to the input side of the control device 60.

  The oil cooler is a heat exchanger that cools the oil by exchanging heat between various oils used in the vehicle and the coolant. When the equipment to be cooled is an oil cooler, it is preferable that a temperature sensor for detecting the temperature of oil flowing into the oil cooler be connected to the input side of the control device 60.

  (7) The air conditioning request signal and the accelerator opening degree signal are input to the control device 60, and the control device 60 controls the operation of the first switching valve 35 and the second switching valve 36 based on these signals. You may come to

  (8) The chiller may be disposed in the low temperature coolant circuit 30 of the above embodiment. The chiller is a heat exchanger that cools the cooling water by exchanging heat between the low-temperature low-pressure refrigerant of the refrigeration cycle and the cooling water.

11 1st low temperature radiator (1st radiator)
12 Second low temperature radiator (second radiator)
21 Upper opening (opening)
22 Lower side opening (opening)
23 Shutter mechanism (opening area adjustment unit)
31 Low temperature coolant pump (pump)
32 Turbocharger (Cooled Equipment)
33 Intercooler (Device to be cooled)
34 Refrigerant radiator (device to be cooled)
35 1st switching valve (flow rate ratio adjustment unit)
60 Control unit (control unit)

Claims (5)

Cooled equipment (32, 33, 34) cooled by the heat medium;
A first radiator (11) and a second radiator (12) for exchanging heat between the heat medium and the outside air introduced from the opening (21, 22) of the vehicle;
An opening area adjustment unit (23) for adjusting the opening area of the opening;
A flow rate ratio adjusting unit (35) for adjusting a flow rate ratio between the heat medium flowing in the first radiator and the heat medium flowing in the second radiator;
A control unit (60) for controlling the operation of the flow rate adjustment unit according to the operation state of the opening area adjustment unit ;
The control unit controls the opening area adjustment unit such that introduction of the outside air to one of the first radiator and the second radiator is suppressed when the traveling speed of the vehicle exceeds a predetermined speed. The vehicle cooling system controls the flow rate adjusting unit so that the flow rate of the heat medium flowing through the one radiator is reduced . Comparing the properties of prior Symbol first radiator and the heat exchange amount of the second radiator, when the speed of the external air flowing exceeds the predetermined speed, the other radiators than the heat exchange amount of the one radiator as towards the heat exchange amount increases, the vehicle cooling system according to claim 1, wherein the first radiator and the second radiator are formed. Cooled equipment (32, 33, 34) cooled by the heat medium;
A first radiator (11) and a second radiator (12) for exchanging heat between the heat medium and the outside air introduced from the opening (21, 22) of the vehicle;
An opening area adjustment unit (23) for adjusting the opening area of the opening;
A flow rate ratio adjusting unit (35) for adjusting a flow rate ratio between the heat medium flowing in the first radiator and the heat medium flowing in the second radiator;
A control unit (60) for controlling the operation of the flow rate adjustment unit according to the operation state of the opening area adjustment unit ;
The control unit is configured to flow through the one radiator when the opening area adjustment unit is operated so as to suppress the introduction of the outside air to one of the first radiator and the second radiator. Controlling the operation of the flow rate adjustment unit so that the flow rate of the heat medium decreases;
The control unit controls the operation of the opening area adjustment unit such that the introduction of the outside air to the one of the radiators is suppressed when the traveling speed of the vehicle exceeds a predetermined speed.
Comparing the characteristics of the heat exchange amount of the first radiator and the second radiator, when the speed of the outside air flowing in exceeds the predetermined speed, the heat exchange amount of the other radiator than the heat exchange amount of the one radiator A cooling system for a vehicle , wherein the first radiator and the second radiator are formed such that a replacement amount is larger . When the opening area adjustment unit is operated such that the portion (22) of the opening facing the one of the radiators is closed, the control unit performs the one operation with respect to the one of the radiators (12). The vehicle cooling system according to any one of claims 1 to 3 , wherein the operation of the flow rate adjustment unit is controlled such that the flow of the heat medium is shut off. The first radiator and the second radiator are disposed parallel to each other in the flow of the heat medium,
The said flow rate ratio adjustment part is a valve | bulb arrange | positioned at the branch part which branches the flow of the said heat medium to the said 1st radiator side and the said 2nd radiator side. Vehicle cooling system.

Images