Vehicle cooling device

Abstract

The present invention relates to a vehicle cooling device, which is used in a vehicle equipped with an internal combustion engine equipped with a supercharger and an intercooler. The cooling device includes a circulation circuit configured to circulate cooling water supplied to the intercooler, an electric pump configured to circulate the cooling water within the circulation circuit, and a control device configured to control the cooling water discharge rate of the pump. The control device is configured to execute a control variable derivation process for deriving a control variable for the pump based on a required flow rate and water temperature, and an operation process for operating the pump based on the control variable when the required flow rate is greater than zero.

Description

Technical Field

[0001] The present disclosure relates to a vehicle cooling device including a circulation circuit for circulating cooling water supplied to an intercooler. Background Art

[0002] The cooling device disclosed in Japanese Patent Application Laid-Open No. 2013-79614 is applied to a hybrid vehicle. This hybrid vehicle includes an internal combustion engine equipped with a supercharger and an intercooler, a motor generator, and an inverter circuit for the motor generator. The cooling device comprises a circulation circuit configured to supply cooling water to the intercooler and the inverter circuit and circulate the cooling water therein, and an electric pump operated to circulate the cooling water within the circulation circuit. Summary of the Invention

[0003] Problems to be solved by the invention

[0004] In the cooling system described above, the pump may be operated to cool the inverter circuit even when the cooling water temperature (i.e., the water temperature) is relatively low. Low water temperature may increase the viscosity of the cooling water. High viscosity of the cooling water may result in a lower flow rate than expected in the circulation loop.

[0005] Means for solving problems

[0006] One aspect of the present disclosure relates to a vehicle cooling device, which is applied to a vehicle equipped with an internal combustion engine equipped with a supercharger and an intercooler configured to cool air supercharged by the supercharger. The vehicle cooling device includes a circulation circuit configured to circulate cooling water supplied to the intercooler; an electric pump configured to operate to circulate the cooling water within the circulation circuit; and a control device configured to control the discharge rate of the cooling water from the pump. The control device is configured to execute a control variable derivation process and an operation process. The control variable derivation process derives a control variable for the pump based on a required flow rate (i.e., a required flow rate) and a temperature (i.e., a required cooling water temperature) in the circulation circuit. The control variable derivation process includes deriving the control variable such that the control variable increases as the required flow rate increases, and the control variable increases when the cooling water temperature is lower than a reference water temperature compared to when the cooling water temperature is higher than the reference water temperature. The operation process operates the pump based on the control variable when the required flow rate is greater than zero. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural diagram showing a part of the structure of a vehicle including the vehicle cooling device according to the embodiment.

[0008] Figure 2When the pump is working Figure 1 Flowchart of a processing routine executed by a control device of a vehicle cooling device.

[0009] Figure 3 Shows the water temperature and Figure 1 A diagram showing an example of the relationship between the drive duty ratios derived by the control device.

[0010] Figure 4 It shows Figure 1 A schematic diagram of a modified example of a circulation circuit of a vehicle cooling device. DETAILED DESCRIPTION

[0011] The following, according to Figures 1 to 3 An embodiment of a vehicle cooling device will be described.

[0012] Figure 1 , a portion of the configuration of a vehicle including a vehicle cooling device 40 is shown. Hereinafter, the vehicle cooling device 40 will be simply referred to as “cooling device 40”.

[0013] The vehicle is a hybrid vehicle equipped with an internal combustion engine 10 and a motor generator 30 as power sources. The vehicle includes an inverter circuit 31 for the motor generator 30. When the motor generator 30 functions as a motor, the inverter circuit 31 converts a DC voltage supplied from an onboard battery into an AC voltage and supplies it to the motor generator 30. On the other hand, when the motor generator 30 functions as a generator, the inverter circuit 31 converts the AC voltage generated by the motor generator 30 into a DC voltage and supplies it to the battery.

[0014] <Internal combustion engine>

[0015] The internal combustion engine 10 includes a combustion chamber 11, an intake passage 12, and an exhaust passage 13. The intake passage 12 is a passage through which air introduced into the combustion chamber 11 flows. In the combustion chamber 11, a mixture of fuel and air is combusted. Exhaust gas generated by the combustion of the mixture in the combustion chamber 11 is discharged into the exhaust passage 13.

[0016] The internal combustion engine 10 includes a supercharger 15. The supercharger 15 includes a turbine 16 disposed in the exhaust passage 13 and a compressor 17 disposed in the intake passage 12. In the turbine 16, the flow of exhaust gas flowing through the exhaust passage 13 causes the turbine impeller to rotate. In turn, in the compressor 17, the compressor impeller rotates synchronously with the rotation of the turbine impeller. As a result, air pressurized by the compressor 17 flows into the intake passage 12.

[0017] The internal combustion engine 10 includes an intercooler 19 for cooling air supercharged by the supercharger 15. Specifically, the intercooler 19 is disposed in a portion of the intake passage 12 between the compressor 17 and the combustion chamber 11. The intercooler 19 is a water-cooled intercooler.

[0018] <Cooling device>

[0019] The cooling device 40 includes a circulation circuit 41 for circulating cooling water, an electric pump 42 that operates to circulate the cooling water within the circulation circuit 41, and a control device 50 that controls the amount of cooling water discharged by the pump 42. The pump 42 is driven by a pump motor 43. The control device 50 controls the amount of cooling water discharged by the pump 42 by driving the pump motor 43.

[0020] The circulation circuit 41 is configured to supply cooling water to either the intercooler 19 or the inverter circuit 31. Figure 1 In the illustrated example, the circulation circuit 41 is configured such that the cooling water discharged from the pump 42 flows through the inverter circuit 31 and then flows through the intercooler 19. That is, the inverter circuit 31 and the intercooler 19 are arranged in series on the circulation circuit 41.

[0021] The cooling water flowing in the circulation loop 41 is cooled by the vehicle-mounted radiator 45. Figure 1 In the example shown, the cooling water having passed through the intercooler 19 and the inverter circuit 31 is cooled by the radiator 45 and then sucked again by the pump 42 .

[0022] Detection signals from various sensors are input to the control device 50. Examples of the sensors include a water temperature sensor 61 and a voltage sensor 62. The water temperature sensor 61 detects the water temperature TMPwt, which is the temperature of the cooling water circulating in the circulation loop 41. The voltage sensor 62 detects the applied voltage Vbt, which is the voltage supplied to the pump motor 43.

[0023] The control device 50 includes a CPU 51 and a memory 52. ​​The memory 52 stores a control program executed by the CPU 51. The memory 52 also stores a flag FLG for determining whether to select a first control variable derivation process or a second control variable derivation process, described later. Furthermore, the memory 52 stores a first map used in the first control variable derivation process and a second map used in the second control variable derivation process. The flag FLG, the first map, and the second map will be described later.

[0024] <Processing of operating the pump>

[0025] Reference Figure 2 and Figure 3Next, a processing routine executed by the control device 50 when the pump 42 is operated will be described. The control device 50 repeatedly executes this processing routine in each predetermined control cycle.

[0026] In this processing routine, in step S11, the control device 50 obtains the requested flow rate Qwp and determines whether it is greater than zero. The requested flow rate Qwp is the requested flow rate of the cooling water in the circulation loop 41. If the requested flow rate Qwp is zero, the control device 50 determines that there is no cooling request for the intercooler 19 or the inverter circuit 31. On the other hand, if the requested flow rate Qwp is greater than zero, the control device 50 determines that there is a cooling request for at least one of the intercooler 19 and the inverter circuit 31. If the requested flow rate Qwp is zero (S11: No), the control device 50 proceeds to step S13.

[0027] In step S13, the control device 50 sets the duty cycle of the drive signal for the pump motor 43, i.e., the drive duty cycle Dmt, to zero. The greater the drive duty cycle Dmt, the higher the rotational speed of the pump motor 43 and the greater the flow rate of cooling water within the circulation loop 41. In this embodiment, the drive duty cycle Dmt corresponds to the "controlled amount of the pump 42." If the drive duty cycle Dmt is set to zero, the control device 50 temporarily terminates this processing routine. In other words, when the drive duty cycle Dmt is zero, the control device 50 does not operate the pump 42.

[0028] On the other hand, if the required flow rate Qwp is greater than zero (Yes) in step S11, the control device 50 proceeds to step S15. In step S15, the control device 50 reads the aforementioned flag FLG from the memory 52 and determines whether flag FLG is set to active (ON). Flag FLG indicates whether the vehicle is a hybrid vehicle equipped with both an internal combustion engine and a motor generator as power sources, or a conventional vehicle equipped with only the internal combustion engine as power source. If flag FLG is set to active, the control device 50 determines that the vehicle is a hybrid vehicle. On the other hand, if flag FLG is set to inactive (OFF), the control device 50 determines that the vehicle is a conventional vehicle.

[0029] A hybrid vehicle equipped with inverter circuit 31 may sometimes travel by driving motor generator 30 while internal combustion engine 10 is stopped. Therefore, in a hybrid vehicle, when water temperature TMPwt is relatively low, intercooler 19 may not be required to cool, while inverter circuit 31 may be required to cool. On the other hand, in a conventional vehicle without inverter circuit 31, intercooler 19 may not be required to cool when water temperature TMPwt is relatively low. This is because warm-up of internal combustion engine 10 has not yet been completed when water temperature TMPwt is relatively low, and there is no requirement to lower the temperature of the air introduced into combustion chamber 11. In other words, in a conventional vehicle, pump 42 may not be required to operate when water temperature TMPwt is lower than reference water temperature TMPwtb. In contrast, in a hybrid vehicle, pump 42 may be required to operate even when water temperature TMPwt is lower than reference water temperature TMPwtb. Therefore, flag FLG corresponds to "information regarding whether pump 42 is to be operated even when water temperature TMPwt is lower than reference water temperature TMPwtb." In addition, the memory 52 storing the flag FLG also functions as an “information storage unit.” In the present embodiment, the vehicle is a hybrid vehicle, and therefore the flag FLG is set to active.

[0030] If flag FLG is set to active in step S15 (YES), the control device 50 proceeds to step S17. In step S17, the control device 50 derives the drive duty ratio Dmt based on the required flow rate Qwp, applied voltage Vbt, and water temperature TMPwt. In this embodiment, the control device 50 refers to a first map stored in the memory 52 and derives a value corresponding to the required flow rate Qwp, applied voltage Vbt, and water temperature TMPwt as the drive duty ratio Dmt.

[0031] The first map is used by the control device 50 to derive the drive duty ratio Dmt based on the required flow rate Qwp, the applied voltage Vbt, and the water temperature TMPwt. By referring to the first map, the control device 50 derives a larger value as the required flow rate Qwp increases. Furthermore, the control device 50 derives a larger value as the applied voltage Vbt decreases. Furthermore, the control device 50 changes the drive duty ratio Dmt based on the water temperature TMPwt.

[0032] Figure 3 The relationship between the water temperature TMPwt and the driving duty ratio Dmt derived by the control device 50 under the condition that the required flow rate Qwp and the applied voltage Vbt are constant is shown. Figure 3As shown, under these conditions, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the control device 50 derives a larger value as the drive duty ratio Dmt than when the water temperature TMPwt is at or above the reference water temperature TMPwtb. This is because, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the viscosity of the coolant changes depending on the water temperature TMPwt. Specifically, the lower the water temperature TMPwt, the higher the viscosity of the coolant. High viscosity makes it difficult for the coolant to flow through the circulation loop 41, and the flow rate of the coolant in the circulation loop 41 is likely to be lower than expected. Therefore, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the control device 50 derives a larger value as the drive duty ratio Dmt than when the water temperature TMPwt is at or above the reference water temperature TMPwtb. More specifically, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the control device 50 derives a larger value as the water temperature TMPwt is lower than the reference water temperature TMPwtb.

[0033] Return to Figure 2 When the drive duty ratio Dmt is derived in this manner, the control device 50 proceeds to the process of step S21.

[0034] On the other hand, if flag FLG is set to inactive in step S15 (No), the control device 50 proceeds to step S19. In step S19, the control device 50 derives the drive duty ratio Dmt based on the required flow rate Qwp and the applied voltage Vbt. That is, the control device 50 derives the drive duty ratio Dmt without considering the water temperature TMPwt. "Deriving the drive duty ratio Dmt without considering the water temperature TMPwt" here means that the drive duty ratio Dmt does not vary based on the water temperature TMPwt. In this embodiment, the control device 50 refers to the second map stored in the memory 52 and derives a value corresponding to the required flow rate Qwp and the applied voltage Vbt as the drive duty ratio Dmt.

[0035] The second map is used by the control device 50 to derive the drive duty ratio Dmt based on the required flow rate Qwp and the applied voltage Vbt. By referring to the second map, the control device 50 derives a value as the drive duty ratio Dmt that increases as the required flow rate Qwp increases. Furthermore, the control device 50 derives a value as the drive duty ratio Dmt that increases as the applied voltage Vbt decreases. After deriving the drive duty ratio Dmt in this manner, the control device 50 proceeds to step S21.

[0036] In step S21, the control device 50 drives the pump motor 43 based on the drive duty ratio Dmt derived in step S17 or step S19. Specifically, the control device 50 operates the pump 42 so that the greater the drive duty ratio Dmt, the greater the amount of cooling water discharged. The control device 50 then temporarily terminates this processing routine.

[0037] Step S17 derives the drive duty cycle Dmt based on the required flow rate Qwp and the water temperature TMPwt. Meanwhile, step S19 derives the drive duty cycle Dmt based solely on the required flow rate Qwp, which is one of the two. Therefore, in this embodiment, step S17 corresponds to the "first control variable derivation process," while step S19 corresponds to the "second control variable derivation process." Furthermore, step S21 corresponds to the "operation process," which operates the pump 42 based on the drive duty cycle Dmt when the required flow rate Qwp is greater than zero. Furthermore, the memory 52 storing the first map also functions as a "map storage unit."

[0038] <Functions and Effects of the Present Embodiment>

[0039] The vehicle cooling device 40 according to this embodiment is applied to a vehicle equipped with an internal combustion engine 10, which is provided with a supercharger 15 and an intercooler 19 configured to cool air supercharged by the supercharger 15. The vehicle cooling device 40 includes a circulation circuit 41 configured to circulate cooling water supplied to the intercooler 19, an electric pump 42 configured to circulate the cooling water within the circulation circuit 41, and a control device 50 configured to control the cooling water discharge rate of the pump 42. The control device 50 is configured to execute a control variable derivation process (step S17) and an operation process (step S21). The control variable derivation process (step S17) derives the control variable (drive duty ratio Dmt) of the pump 42 based on the required flow rate Qwp (required value) of the cooling water flow rate in the circulation circuit 41 and the cooling water temperature TMPwt (required value). The control variable derivation process (step S17) includes deriving the control variable (drive duty cycle Dmt) such that the larger the required flow rate Qwp, the larger the control variable (drive duty cycle Dmt). Furthermore, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the control variable (drive duty cycle Dmt) becomes larger than when the water temperature TMPwt is at or above the reference water temperature TMPwtb. The operation process (step S21) operates the pump 42 based on the control variable (drive duty cycle Dmt) when the required flow rate Qwp is greater than zero.

[0040] The vehicle cooling device 40 according to this embodiment derives a value based on the water temperature TMPwt as the drive duty ratio Dmt. Specifically, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, a value greater than that when the water temperature TMPwt is above the reference water temperature TMPwtb is derived as the drive duty ratio Dmt. The coolant discharge rate of the pump 42 is then controlled based on the drive duty ratio Dmt. This ensures that even when the coolant has difficulty flowing through the circulation loop 41 due to low water temperature TMPwt and high viscosity, the actual flow rate of the coolant circulating in the circulation loop 41 is unlikely to deviate from the required flow rate. This prevents the flow rate of the coolant circulating in the circulation loop 41 from being less than expected when the pump 42 is operated under conditions of low water temperature TMPwt. Consequently, a decrease in the cooling efficiency of the target to be cooled by the coolant can be suppressed. In this embodiment, the intercooler 19 and the inverter circuit 31 are the targets to be cooled by the coolant.

[0041] In this embodiment, the following effects can also be obtained.

[0042] (1) The vehicle according to this embodiment is a hybrid vehicle including a motor generator 30 and an inverter circuit 31 for the motor generator 30. The circulation circuit 41 is configured to supply cooling water to either the intercooler 19 or the inverter circuit 31 by operating the pump 42. The control device 50 is configured to operate the pump 42 even when cooling of the inverter circuit 31 is required. The vehicle according to this embodiment can travel by driving the motor generator 30 even when the internal combustion engine 10 is stopped. Therefore, even when the water temperature TMPwt is low, it is possible to circulate cooling water within the circulation circuit 41 to cool the inverter circuit 31. In this embodiment, when cooling of the inverter circuit 31 is required even when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the pump 42 is operated. At this time, a value that takes the water temperature TMPwt into account is derived as the drive duty ratio Dmt. Therefore, by operating the pump 42 based on this drive duty ratio Dmt, a sufficient amount of cooling water can be supplied to the inverter circuit 31. Therefore, it is possible to suppress a decrease in the cooling efficiency of the inverter circuit 31 .

[0043] (2) The control device 50 includes a map storage unit (memory 52) configured to store a map representing the relationship between the required flow rate Qwp, the water temperature TMPwt, and the control variable. The control device 50 is configured to refer to the map in the control variable derivation process to derive the control variable (drive duty ratio Dmt) corresponding to the required flow rate Qwp and the water temperature TMPwt. The control variable derivation process is the first control variable derivation process (step 17). The control device 50 includes an information storage unit (memory 52) configured to store information (flag FLG) regarding whether the pump 42 is to be operated even if the water temperature TMPwt is lower than the reference water temperature TMPwtb. The control device 50 is configured to execute a first control variable derivation process (step S17) when the information (flag FLG) stored in the information storage unit (memory 52) indicates that the pump 42 is to be operated even if the water temperature TMPwt is lower than the reference water temperature TMPwtb, and to execute a second control variable derivation process (step S19) when the information (flag FLG) stored in the information storage unit (memory 52) indicates that the pump 42 is not to be operated if the water temperature TMPwt is lower than the reference water temperature TMPwtb. The second control variable derivation process (step S19) is a process for deriving a control variable (drive duty ratio Dmt) based solely on the required flow rate Qwp and the water temperature TMPwt.

[0044] Consider a comparative example in which the control device 50 refers to the second map instead of the first map in step S17. In this comparative example, the control device 50 refers to the second map to derive a value corresponding to the required flow rate Qwp and the applied voltage Vbt as the base duty cycle. Furthermore, the control device 50 derives a correction value corresponding to the water temperature TMPwt to ensure that a sufficient amount of cooling water is supplied to the inverter circuit 31 regardless of the water temperature TMPwt. In this case, when the water temperature TMPwt is lower than the base water temperature TMPwtb, the control device 50 derives a larger correction value than when the water temperature TMPwt is higher than the base water temperature TMPwtb. Furthermore, the control device 50 derives the sum of the base duty cycle and the correction value as the drive duty cycle Dmt. Even in this case, when the viscosity of the cooling water increases due to the low water temperature TMPwt, the actual cooling water flow rate can be somewhat suppressed from deviating from the required flow rate. However, using such a correction value is not sufficient to minimize the deviation between the actual cooling water flow rate and the required flow rate.

[0045] In this regard, in this embodiment, the drive duty ratio Dmt is derived by reference to a first map. This first map was created through experiments and simulations so that the control device 50, referring to the first map, can derive the drive duty ratio Dmt that minimizes the difference between the actual cooling water flow rate and the required flow rate based on the required flow rate Qwp, applied voltage Vbt, and water temperature TMPwt. Therefore, by driving the pump motor 43 using the drive duty ratio Dmt derived by reference to the first map, the control device 50 is less likely to experience a difference between the actual cooling water flow rate and the required flow rate, compared to the comparative example described above.

[0046] <Change Example>

[0047] The above-mentioned embodiment can be implemented by modifying as follows: The above-mentioned embodiment and the following modified examples can be implemented in combination with each other within the scope of no technical contradiction.

[0048] As long as the cooling water discharged by the pump 42 can be supplied to either the intercooler 19 or the inverter circuit 31, the circulation circuit may be connected to the Figure 1 The circulation circuits 41 shown are of different configurations. Figure 4 , a modified example of a circulation circuit 41A is shown. The circulation circuit 41A is configured so that the intercooler 19 and the inverter circuit 31 are arranged in parallel. Specifically, the circulation circuit 41 includes a first flow path 411 for cooling water supplied to the intercooler 19 and a second flow path 412 for cooling water supplied to the inverter circuit 31. Even in this case, the pump 42 can supply cooling water to either the intercooler 19 or the inverter circuit 31.

[0049] If cooling of the intercooler 19 is sometimes required even when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the circulation circuit 41 may not supply cooling water to the inverter circuit 31. In this case, the vehicle may be a conventional vehicle that does not include the motor generator 30 as a power source.

[0050] The control device 50 may refer to the second map instead of the first map when deriving the drive duty cycle Dmt. In this case, the control device 50 derives a value corresponding to the required flow rate Qwp and the applied voltage Vbt as the reference duty cycle by referring to the second map. In addition, the control device 50 derives a correction value corresponding to the water temperature TMPwt. At this time, when the water temperature TMPwt is lower than the reference water temperature TMPwtb, the control device 50 derives a value larger than the value when the water temperature TMPwt is higher than the reference water temperature TMPwtb as the correction value. Furthermore, the control device 50 derives the sum of the reference duty cycle and the correction amount as the drive duty cycle Dmt. In this case as well, even if the viscosity of the cooling water increases due to the low water temperature TMPwt, the actual flow rate of the cooling water can be suppressed to a certain extent from deviating from the required flow rate.

[0051] The vehicle involved in the above-mentioned embodiment is a hybrid vehicle. Figure 2 The processing routine shown may also omit the processing of step S15 and the processing of step S19. In this case, the second map may not be stored in the memory 52, and the flag FLG may not be stored.

[0052] The control device 50 is not limited to a configuration including a CPU and a ROM and executing software processing. That is, the control device 50 can be configured by a processing circuit including any one of the following (a) to (c).

[0053] (a) One or more processors that execute at least a portion of various processes according to a computer program (software). A processor includes a CPU and memory such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute the processes. Memory, or computer-readable media, includes all available media that can be accessed by general-purpose or special-purpose computers.

[0054] (b) One or more dedicated hardware circuits that perform at least a portion of the various processes. Examples of dedicated hardware circuits include integrated circuits for specific applications, such as ASICs or FPGAs. ASIC stands for "Application Specific Integrated Circuit," and FPGA stands for "Field Programmable Gate Array."

[0055] (c) One or more processors that execute part of various processes according to a computer program, and one or more dedicated hardware circuits that execute the remaining processes among the various processes.

Claims

1. A cooling device for a vehicle, applied to a vehicle, The vehicle includes an internal combustion engine provided with a supercharger and an intercooler configured to cool air supercharged by the supercharger. The vehicle cooling device comprises: a circulation circuit configured to circulate cooling water supplied to the intercooler; an electric pump configured to operate to circulate the cooling water within the circulation circuit; and a control device configured to control the discharge rate of the cooling water by the pump, The control device is configured to execute control amount derivation processing and operation processing, The control amount derivation process is a process of deriving the control amount of the pump based on the required flow rate (required flow rate) and the temperature (water temperature) of the cooling water in the circulation circuit. The control amount derivation process includes: The control amount is derived such that the larger the required flow rate is, the larger the control amount is, and the control amount is larger when the water temperature is lower than a reference water temperature than when the water temperature is higher than the reference water temperature. The operation process is a process of operating the pump based on the control amount when the required flow rate is greater than zero. The control amount derivation process is a first control amount derivation process, The control device includes an information storage unit configured to store information regarding whether to operate the pump even if the water temperature is lower than the reference water temperature. The control device is configured as follows: When the information stored in the information storage unit indicates that the pump is to be operated even if the water temperature is lower than the reference water temperature, the first controlled variable derivation process is executed. When the information stored in the information storage unit indicates that the pump is not to be operated if the water temperature is lower than the reference water temperature, a second controlled variable derivation process is executed. The second controlled variable derivation process is a process of deriving the controlled variable based on only the required flow rate out of the required flow rate and the water temperature.

2. The vehicle cooling device according to claim 1, The vehicle is a hybrid vehicle including a motor generator and an inverter circuit for the motor generator. The circulation circuit is configured so that the cooling water can be supplied to either the intercooler or the inverter circuit by the operation of the pump. The control device is configured to operate the pump even when cooling of the inverter circuit is required.

3. The vehicle cooling device according to claim 1 or 2, The control device includes a map storage unit configured to store a map indicating a relationship among the required flow rate, the water temperature, and the controlled amount. The control device is configured to derive the controlled variable corresponding to the required flow rate and the water temperature by referring to the map in the controlled variable deriving process.

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