JP2008236955A - Cooling system, and control method and vehicle therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress temperature rise of a motor by controlling cooling of the motor. <P>SOLUTION: When the absolute value of the rotational speed Nm of a motor, which outputs power to the driving wheels, is below a threshold value Nref and the cooling-water temperature Tw of the cooling water for cooling the motor is above the threshold Twref, the target rotational speed Nw* of a water pump, which forcedly sends the cooling water to the circulation current, wherein the cooling water for cooling the motor circulates, is set so as to attain the rotational speed higher than that, based on the relation between the cooling-water temperature Tw and the rotational speed of the water pump (S110, S120, S140), thereby drive controlling the water pump so as to drive the water pump at the set target rotational speed Nw* (S150). Then, since the motor can be cooled by an increased cooling force, prior to the rotation stop of the motor, temperature rise of the motor can be suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling system, a control method thereof, and a vehicle.

Conventionally, as this type of cooling system, one that cools an electric motor mounted on a vehicle using cooling water has been proposed (for example, see Patent Document 1). In this cooling system, by controlling the flow rate of the cooling water based on the rotation speed of the motor, the temperature rise of the motor when the rotation speed of the motor is relatively high is suppressed.
JP 2006-174562 A

  However, in the above-described cooling system, no consideration is given to the increase in the temperature of the electric motor when the rotation speed of the electric motor stays in the vicinity of the value 0. When the rotational speed of the electric motor stays in the vicinity of the value 0, the current concentrates and flows only in one specific phase of each phase coil of the electric motor, so that the heat generation of the electric motor is promoted and the temperature of the electric motor rises. is there. As the temperature of the motor rises, heat damage may occur, so it is desirable to suppress such temperature rise.

  An object of the cooling system, the control method thereof, and the vehicle of the present invention is to suppress the temperature rise of the rotating electrical machine.

  The cooling system, the control method thereof, and the vehicle of the present invention employ the following means in order to achieve the above-described object.

The cooling system of the present invention comprises:
A cooling system for cooling a rotating electrical machine,
Cooling means for cooling at least the rotating electrical machine with adjustable cooling power;
A rotational speed detection means for detecting the rotational speed of the rotating electrical machine;
Temperature reflected physical quantity detecting means for detecting a temperature reflected physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine;
When the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the cooling means is controlled to cool the rotating electrical machine with a cooling power based on the detected temperature-reflecting physical quantity and a predetermined relationship; When the absolute value of the number of rotations is less than or equal to the predetermined value, the cooling means is controlled so that the rotating electrical machine is cooled with a cooling power larger than the cooling power based on the detected temperature reflected physical quantity and the predetermined relationship. Control means;
It is a summary to provide.

  In the cooling system of the present invention, when the absolute value of the rotational speed of the rotating electrical machine is larger than a predetermined value, the cooling electrical machine is cooled so that the rotating electrical machine is cooled by a cooling force based on a temperature reflection physical quantity reflecting the temperature of the rotating electrical machine and a predetermined relationship. When the absolute value of the rotational speed of the rotating electrical machine is equal to or less than a predetermined value, the cooling means is controlled so that the rotating electrical machine is cooled with a cooling power larger than the cooling power based on the temperature reflected physical quantity and the predetermined relationship. Since the cooling of the rotating electrical machine is promoted when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than a predetermined value, an increase in the temperature of the rotating electrical machine can be suppressed. Here, the “temperature reflecting physical quantity” includes the temperature of the rotating electrical machine and the torque output from the rotating electrical machine, and the “predetermined value” includes the value 0. Here, the “rotary electric machine” includes an electric motor and a generator.

  In such a cooling system of the present invention, the predetermined relationship may be a relationship in which the cooling power of the cooling means increases as the temperature of the rotating electrical machine reflected by the detected temperature reflecting physical quantity increases. it can. If it carries out like this, it can suppress that a rotary electric machine reaches high temperature.

  In the cooling system of the present invention, the control means may be configured such that when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than the predetermined value, the temperature of the rotating electrical machine reflected by the temperature reflecting physical quantity is equal to or lower than the predetermined temperature. In some cases, the cooling means may be controlled so that the rotating electrical machine is cooled by a cooling force based on the temperature-reflecting physical quantity and the predetermined relationship. In this way, it is possible to prevent the rotating electrical machine from being excessively cooled.

  Further, in the cooling system of the present invention, the cooling means includes a pressure feeding means for pumping the cooling medium to a circulation flow path for circulating the cooling medium to the rotating electrical machine, and a radiator for cooling the cooling medium by heat exchange with outside air. The cooling power can be adjusted by adjusting the flow rate of the cooling medium pumped by the pumping means. In this way, the cooling power of the cooling means can be adjusted by adjusting the flow rate of the cooling medium. In this case, the cooling means has air blowing means for supplying the outside air to the radiator, and the cooling power can be adjusted by adjusting the amount of the outside air supplied to the radiator by the air blowing means. It can also be. If it carries out like this, the cooling power of a cooling means can be adjusted by adjusting the quantity of the external air supplied to a radiator.

  The vehicle of the present invention is a rotating electrical machine and the cooling system of the present invention according to any one of the above-described embodiments that cools the rotating electrical machine, that is, a cooling system that basically cools the rotating electrical machine, and is adjustable. Cooling means for cooling at least the rotating electrical machine with cooling power, rotational speed detecting means for detecting the rotational speed of the rotating electrical machine, and temperature reflecting physical quantity detection for detecting a temperature reflecting physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine And when the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the cooling means is controlled so that the rotating electrical machine is cooled with a cooling power based on the detected temperature reflected physical quantity and a predetermined relationship, When the absolute value of the rotation speed of the rotating electrical machine is equal to or less than the predetermined value, the rotation power is larger than the cooling power based on the detected temperature-reflecting physical quantity and the predetermined relationship. Electric is summarized in that comprising, a cooling system and a control means for controlling the cooling means to be cooled.

  Since the vehicle of the present invention includes the cooling system of the present invention according to any one of the aspects described above, the effects of the cooling system of the present invention, for example, cooling of the rotating electrical machine is promoted to suppress the temperature rise of the rotating electrical machine. The same effects as those that can be achieved can be achieved.

  In the vehicle according to the present invention, the rotating electrical machine may be used as one of driving sources for traveling. In this case, an internal combustion engine that outputs power to a drive shaft connected to an axle, and an electric power and power connected to the output shaft of the internal combustion engine that is connected to the drive shaft and is rotatable independently of the drive shaft. Power input / output means capable of outputting at least part of the power from the internal combustion engine to the drive shaft with the input / output of the rotating electrical machine, and the rotating electrical machine is connected to the drive shaft so as to be able to output power. Thus, the cooling system may be a means for cooling the rotating electrical machine and the rotation adjusting means.

The cooling system control method of the present invention includes:
A control method of a cooling system comprising cooling means for cooling at least a rotating electrical machine with an adjustable cooling power,
A rotational speed detection means for detecting the rotational speed of the rotating electrical machine;
Temperature reflected physical quantity detecting means for detecting a temperature reflected physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine;
When the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the cooling means is configured to cool the rotating electrical machine with a cooling force based on a temperature reflecting physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine and a predetermined relationship. And when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than the predetermined value, the cooling electrical machine is cooled with a cooling power larger than the cooling power based on the temperature reflected physical quantity and the predetermined relationship. It is characterized by controlling the means.

  In this cooling system control method of the present invention, when the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the rotating electrical machine is cooled with a cooling force based on a temperature-reflecting physical quantity that reflects the temperature of the rotating electrical machine and a predetermined relationship. The cooling means is controlled so that when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than a predetermined value, the rotating electrical machine is cooled with a cooling power larger than the cooling power based on the temperature reflected physical quantity and the predetermined relationship. Control. Since the cooling of the rotating electrical machine is promoted when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than a predetermined value, an increase in the temperature of the rotating electrical machine can be suppressed. Here, the “rotary electric machine” includes an electric motor and a generator.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of a configuration of an electric vehicle 20 equipped with a cooling system as an embodiment of the present invention. As shown in FIG. 1, the electric vehicle 20 includes a drive device 27 having a motor 22 that can output power to the drive wheels 21 a and 21 b and an inverter 24 that drives the motor 22 using electric power supplied from the battery 26. A cooling device 28 that cools the motor 22 and the inverter 24 using cooling water as a cooling medium, and an electronic control unit 40 that controls the entire automobile and also functions as a part of the cooling device 28 are provided.

  The cooling device 28 includes a radiator 30 that cools the cooling water by heat exchange with the outside air, an electric cooling fan 32 that supplies the outside air to the radiator 30, and a circulation passage 34 that circulates the cooling water to the motor 22 and the inverter 24. An electric water pump 36 that pumps the cooling water to the circulation flow path 34, and the cooling water cooled in the radiator 30 by heat exchange with the outside air supplied from the cooling fan 32 is circulated by the water pump 36. By circulating in 34, the motor 22 and the inverter 24 are cooled.

  The electronic control unit 40 is configured as a microprocessor centered on the CPU 42. In addition to the CPU 42, a ROM 44 for storing processing programs, a RAM 46 for temporarily storing data, an input / output port and a communication port (not shown), Is provided. The electronic control unit 40 is provided with a rotational temperature θm from a rotational position detection sensor 23 that detects the rotational position of the motor 22 and a cooling water temperature that is attached upstream of the cooling water flow path of the inverter 24 and detects the temperature of the cooling water. The coolant temperature Tw from the sensor 39 is input via the input port. In addition, the electronic control unit 40 controls a switching signal to the switching element of the inverter 24 for controlling the motor 22, a driving control signal for driving and controlling the water pump 36, and a driving control signal for driving and controlling the cooling fan 32. Etc. are output via the output port.

  In the cooling device 28 of the embodiment thus configured, the motor 22 and the inverter 24 are cooled by adjusting the flow rate of the cooling water pumped by the water pump 36 and the amount of outside air supplied from the cooling fan 32 to the radiator 30. Cooling power is adjusted.

  Next, the operation of the cooling device 28 of the embodiment thus configured, particularly the operation when driving the water pump 36 will be described. FIG. 3 is a flowchart showing an example of a water pump drive control routine executed by the electronic control unit 40. This routine is repeatedly executed every predetermined time (for example, every several msec).

  When the water pump drive control routine is executed, the electronic control unit 40 first inputs data necessary for control such as the rotational position θm from the rotational position detection sensor 23 and the coolant temperature Tw from the coolant temperature sensor 39. The process is executed (step S100), and the absolute value of the rotational speed Nm of the motor 22 calculated based on the input rotational position θm is compared with the threshold value Nref (step S110). Here, the threshold value Nref is set as a threshold value for the rotational speed at which the motor 22 is predicted to stop, and is set to a relatively low rotational speed (for example, 50 rpm) including the value 0. The absolute value of the rotation speed Nm of the motor 22 is compared with the threshold value Nref because when the rotation of the motor 22 stops, the motor 22 enters a current concentration state in which current concentrates on a specific phase of each phase coil of the motor 22. This is because the temperature of the inverter 22 or the inverter 24 may rise, so that it is determined whether or not there is a possibility of reaching such a current concentration state or a current concentration state.

  When the absolute value of the rotational speed Nm of the motor 22 is larger than the threshold value Nref, there is no possibility of reaching a current concentration state, so that the water pump is based on the cooling water temperature Tw so that the motor 22 and the inverter 24 are cooled with normal cooling power. A target rotational speed Nw * of 36 is set (step S130). Here, the target rotational speed Nw * is set as the rotational speed at which cooling water having a flow rate sufficient to cool the motor 22 and the inverter 24 can be pumped to the circulation flow path 34. In the embodiment, the cooling water temperature Tw and water The relationship with the rotational speed Nw of the pump 36 is determined in advance and stored in the ROM 74 as a rotational speed setting map, and when the cooling water temperature Tw is given, the value derived from the map as the corresponding rotational speed is the target rotational speed Nw *. Shall be set as FIG. 3 shows an example of the rotation speed setting map. As shown in the figure, the rotational speed of the water pump 36 is set to increase in proportion to the increase in the cooling water temperature Tw. The reason for setting in this way is that the cooling water temperature Tw reflects the temperature of the motor 22 and the inverter 24, and it is considered that the temperature of the motor 22 and the inverter 24 increases as the cooling water temperature Tw increases. This is because the cooling power of the cooling device 28 is increased by increasing the number of rotations of the water pump 36 in proportion to the increase in the temperature.

  When the target rotational speed Nw * of the water pump 36 is thus set, the water pump 36 is driven and controlled to drive at the target rotational speed Nw * set by the water pump 36 (step S150), and this routine is terminated. Thus, when the absolute value of the rotational speed Nm of the motor 22 is larger than the threshold value Nref, the motor 22 and the inverter 24 are appropriately controlled by driving and controlling the water pump 36 so that the motor 22 and the inverter 24 are cooled with normal cooling power. Can be cooled to.

  When the absolute value of the rotational speed Nm of the motor 22 is equal to or less than the threshold value Nref (step S110), the coolant temperature Tw and the threshold value Twref are subsequently compared (step S120). Here, the threshold value Twref is determined that the motor 22 or the inverter 24 does not reach a high temperature when the rotation speed Nm of the motor 22 stays near 0 while cooling the motor 22 or the inverter 24 with a normal cooling power. It is assumed that the cooling water temperature is set to reflect the upper limit value of the possible motor 22 or inverter 24 temperature. When the cooling water temperature Tw is equal to or lower than the threshold value Twref, it is determined that the motor 22 and the inverter 24 are sufficiently low in temperature and can be cooled with normal cooling power, and the processing of steps S130 and S150 is completed. This routine is terminated.

  On the other hand, when the cooling water temperature Tw is higher than the threshold value Twref (step S110), it is determined that there is a possibility that the motor 22 or the inverter 24 will reach a high temperature when the motor 22 or the inverter 24 is cooled with a normal cooling power. 3 is set as the target rotational speed Nw * of the motor 22 by setting the rotational speed set using the rotational speed setting map illustrated in FIG. 3 and the predetermined additional rotational speed Nw1 (step S140). The drive of the water pump 36 is controlled so that the water pump 36 is driven at the target rotational speed Nw * (step S150), and this routine is finished. In the process of step S140, the additional rotation speed Nw1 is set to the circulation flow path 34 with a flow rate of cooling water that can sufficiently suppress the temperature rise of the motor 22 and the inverter 24 when the rotation speed of the motor 22 stays near 0. It was set based on the number of rotations of the water pump 36 that can be pumped. FIG. 4 is an explanatory diagram illustrating an example of a temporal change in the temperature of the motor 22 when the coolant temperature Tw is higher than the threshold value Twref. A solid line indicates the temperature of the motor 22, the rotational speed Nm of the motor 22, and the target rotational speed Nw * of the water pump 36 when the motor 22 and the inverter 24 are cooled using the cooling device 28 of the embodiment. For comparison, even when the absolute value of the rotational speed Nm of the motor 22 is equal to or lower than the threshold value Nref and the cooling water temperature Tw is higher than the threshold value Twref, the temperature of the motor 22 when the motor 22 or the inverter 24 is cooled with normal cooling power. This change is indicated by a broken line. When cooling with normal cooling power, as indicated by a broken line in the figure, when the rotation speed Nm of the motor 22 becomes 0, the temperature of the motor 22 rapidly increases. On the other hand, in the cooling device 28 of the embodiment, as shown by the solid line in the figure, when the absolute value of the rotational speed Nm of the motor 22 is equal to or less than the threshold value Nref, the rotational speed of the water pump 36 is increased to increase the speed of the cooling device 28. Since the cooling power is made larger than usual, the temperature rise of the motor 22 and the inverter 24 can be suppressed. Moreover, since the cooling power of the cooling device 28 is increased before the temperature of the motor 22 rises, the motor 22 and the inverter 24 are compared to those in which the cooling power of the cooling device 28 is increased after the temperature of the motor 22 rises. The temperature rise can be further suppressed.

  According to the electric vehicle 20 of the embodiment described above, the rotation speed of the water pump 36 of the cooling device 28 is increased when the rotation speed Nm of the motor 22 is equal to or lower than the threshold value Nref and the cooling water temperature Tw is higher than the threshold value Twref. The cooling power of the cooling device 28 can be increased, and an increase in temperature of the motor 22 and the inverter 24 can be suppressed. At this time, the higher the cooling water temperature Tw is, the higher the rotation speed of the water pump 36 is increased and the cooling power of the cooling device 28 is increased. Therefore, the temperature rise of the motor 22 and the inverter 24 can be suppressed more appropriately.

  In the electric vehicle 20 of the embodiment, the additional rotation speed Nw1 is set to a constant value regardless of the cooling water temperature Tw in the process of step S140. However, the additional rotation speed Nw1 is set larger as the cooling water temperature Tw increases. It is good also as a thing.

  In the electric vehicle 20 of the embodiment, in the rotation speed setting map illustrated in FIG. 3, the rotation speed of the water pump 36 is increased in proportion to the cooling water temperature Tw. What is necessary is just to set to the tendency which becomes large, so that Tw becomes high, and it is good also as what sets the rotation speed Nm of the motor 22 large stepwise with respect to the cooling water temperature Tw, or large curve shape.

  In the electric vehicle 20 of the embodiment, the rotation speed of the water pump 36 in the rotation speed setting map illustrated in FIG. 3 and the additional rotation speed Nw1 used in the process of step S140 are set using the cooling water temperature Tw. However, any physical quantity that reflects the temperature of the motor 22 may be used. For example, the physical quantity may be set using the temperature of the motor 22 or the torque output from the motor 22. Good.

  In the electric vehicle 20 of the embodiment, even when the absolute value of the rotational speed Nm of the motor 22 is equal to or lower than the threshold value Nref, the motor 22 and the inverter 24 are cooled with normal cooling power when the cooling water temperature Tw is lower than the threshold value Twref. However, when the absolute value of the rotational speed Nm of the motor 22 is not more than the threshold value Nref without executing the process of comparing the cooling water temperature Tw and the threshold value Twref, the motor 22 and the inverter 24 are cooled with a cooling power larger than usual. Also good.

  In the electric vehicle 20 of the embodiment, the cooling power of the cooling device 28 is adjusted by adjusting the rotational speed of the water pump 36, but the cooling power is adjusted by adjusting the amount of air blown from the cooling fan 32 to the radiator 30. The cooling power may be adjusted by adjusting the rotational speeds of both the water pump 36 and the cooling fan 32.

  In the electric vehicle 20 of the embodiment, the drive device 27 is assumed to have the motor 22 as a drive source. However, in addition to the motor 22 and the battery 26, as illustrated in the electric vehicle 120 of the modified example of FIG. The engine 122 and the motor 130 may be connected to the drive shaft 132 connected to the axle via the planetary gear mechanism 126. In this case, it is desirable that the cooling device 28 cools the motor 130 and the inverter 124 that drives the motor 130 in addition to the motor 22 and the inverter 24. Further, as exemplified in the electric vehicle 220 of the modified example of FIG. 6, the drive device 27 includes a drive shaft connected to the engine 222, the inner rotor 232 connected to the crankshaft of the engine 222, and the drive wheels 21 a and 21 b. And an outer rotor 234 connected to the counter rotor motor 230 that transmits a part of the power of the engine 222 to the drive shaft 32 and converts the remaining power into electric power. In this case, it is desirable that the cooling device 28 cools the counter-rotor motor 230 and the inverter 234 that drives the counter-rotor motor 230 in addition to the motor 22 and the inverter 24. In addition, the present invention is not limited to the case where the motor mounted on the driving device is cooled, and may be used for any motor such as a motor that is not mounted on the driving device. In addition, the motor is not limited to one that can be driven as an electric motor, and may be one that can be driven as a generator or one that can be driven as a generator and that is configured as a rotating electrical machine that can be driven as an electric motor. Good. Furthermore, it may be in the form of a method for controlling the cooling device of such a drive device.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the motor 22 corresponds to “rotary electric machine”, the cooling device 28 that cools the motor 22 with adjustable cooling power corresponds to “cooling means”, and the cooling water temperature sensor 39 that detects the cooling water temperature Tw includes “ Corresponding to “temperature reflected physical quantity detection means”, when the absolute value of the rotational speed Nm of the motor 22 is larger than the threshold value Nref, the target rotational speed Nw * of the water pump 36 is set using the rotational speed setting map illustrated in FIG. Rotation obtained by adding the rotation speed Nw2 to the rotation speed Nw1 set using the rotation speed setting map illustrated in FIG. 3 when the processing in step S130 or the absolute value of the rotation speed Nm of the motor 22 is equal to or less than the threshold value Nref. Step S140 for setting the number as the target rotational speed Nw * of the water pump 36, so that the water pump 36 is driven at the set target rotational speed Nw *. Electronic control unit 40 executing the processing in step S150 for driving and controlling the Otaponpu 36 corresponds to a "control unit". The engine 122 that outputs power to the drive shaft 132 connected to the axle corresponds to an “internal combustion engine”. The engine 122 is connected to the drive shaft 132 and can be rotated independently of the drive shaft 132 to the output shaft of the engine 122. A configuration having a planetary gear mechanism 126 and a motor 122 connected and capable of outputting at least a part of the power from the engine 122 to the drive shaft 132 with input / output of electric power and power corresponds to “power power input / output means”. . The motor 130 and the counter-rotor motor 230 also correspond to the “rotary electric machine”. The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. In other words, the interpretation of the invention described in the column of means for solving the problem should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problem. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  INDUSTRIAL APPLICABILITY The present invention can be used in the manufacturing industry of a cooling device for a rotating electrical machine, the manufacturing industry of a vehicle, and the like.

It is a block diagram which shows the outline of a structure of the electric vehicle 20 which is one Example of this invention. It is a flowchart which shows an example of the drive control routine of the water pump 36 performed by the electronic control unit 40 of an Example. It is explanatory drawing which shows an example of the map for rotation speed setting. It is explanatory drawing explaining an example of the time change of the temperature of the motor. It is a block diagram which shows the outline of a structure of the electric vehicle 120 of a modification. It is a block diagram which shows the outline of a structure of the electric vehicle 220 of a modification.

Explanation of symbols

  20, 120, 220 Electric vehicle, 21a, 21b Drive wheel, 22 Motor, 23 Rotation position detection sensor, 24, 124, 224 Inverter, 26 Battery, 27 Drive device, 28 Cooling device, 30 Radiator, 32 Cooling fan, 34 Circulation Flow path, 36 Water pump, 40 Electronic control unit, 42 CPU, 44 ROM, 46 RAM, 122, 222 Engine, 126 Planetary gear mechanism, 22, 130 Motor, 132 Drive shaft, 230 Counter rotor motor, 232 Inner rotor, 234 Outer rotor.

Claims (9)

A cooling system for cooling a rotating electrical machine,
Cooling means for cooling at least the rotating electrical machine with adjustable cooling power;
A rotational speed detection means for detecting the rotational speed of the rotating electrical machine;
Temperature reflected physical quantity detecting means for detecting a temperature reflected physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine;
When the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the cooling means is controlled to cool the rotating electrical machine with a cooling power based on the detected temperature-reflecting physical quantity and a predetermined relationship; When the absolute value of the number of rotations is less than or equal to the predetermined value, the cooling means is controlled so that the rotating electrical machine is cooled with a cooling power larger than the cooling power based on the detected temperature reflected physical quantity and the predetermined relationship. Control means;
With cooling system.   The cooling system according to claim 1, wherein the predetermined relationship is a relationship in which the cooling power of the cooling unit increases as the temperature of the rotating electrical machine reflected by the detected temperature reflecting physical quantity increases.   When the absolute value of the rotational speed of the rotating electrical machine is equal to or lower than the predetermined value, the control means is configured to detect the temperature reflected physical quantity and the predetermined speed when the temperature of the rotating electrical machine reflected by the temperature reflected physical quantity is equal to or lower than a predetermined temperature. The cooling system according to claim 1, wherein the cooling means is controlled so that the rotating electrical machine is cooled by a cooling force based on   The cooling means includes a pressure feeding means that pumps the cooling medium to a circulation passage that circulates the cooling medium to the rotating electrical machine, and a radiator that cools the cooling medium by heat exchange with outside air. The cooling system according to any one of claims 1 to 3, wherein the cooling system is a means capable of adjusting a cooling power by adjusting a flow rate of a cooling medium to be pumped.   The said cooling means has a ventilation means which supplies external air to the said radiator, and is a means which can adjust a cooling power by adjusting the quantity of the external air supplied to the said radiator by this ventilation means. Cooling system.   A vehicle comprising: a rotating electrical machine; and the cooling system according to claim 1 that cools the rotating electrical machine.   The vehicle according to claim 6, wherein the rotating electric machine is used as one of driving sources for traveling. The vehicle according to claim 7,
An internal combustion engine that outputs power to a drive shaft connected to the axle;
Connected to the drive shaft and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, and at least part of the power from the internal combustion engine with input and output of electric power and power is the drive shaft Power input / output means capable of outputting to
The rotating electrical machine is connected to the drive shaft so that power can be output,
The cooling system is a means for cooling the rotating electrical machine and the rotation adjusting means. A control method of a cooling system comprising cooling means for cooling at least a rotating electrical machine with an adjustable cooling power,
A rotational speed detection means for detecting the rotational speed of the rotating electrical machine;
Temperature reflected physical quantity detection means for detecting a temperature reflected physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine;
When the absolute value of the rotational speed of the rotating electrical machine is greater than a predetermined value, the cooling means is configured to cool the rotating electrical machine with a cooling force based on a temperature reflecting physical quantity that is a physical quantity reflecting the temperature of the rotating electrical machine and a predetermined relationship. And when the absolute value of the rotational speed of the rotating electrical machine is equal to or less than the predetermined value, the cooling electrical machine is cooled with a cooling power larger than the cooling power based on the temperature reflected physical quantity and the predetermined relationship. A control method for a cooling system, characterized by controlling the means.

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