WO2024106361A1 - Dispositif d'entraînement et procédé de commande de dispositif de refroidissement - Google Patents

Dispositif d'entraînement et procédé de commande de dispositif de refroidissement Download PDF

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Publication number
WO2024106361A1
WO2024106361A1 PCT/JP2023/040689 JP2023040689W WO2024106361A1 WO 2024106361 A1 WO2024106361 A1 WO 2024106361A1 JP 2023040689 W JP2023040689 W JP 2023040689W WO 2024106361 A1 WO2024106361 A1 WO 2024106361A1
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WIPO (PCT)
Prior art keywords
command value
flow
temperature
motor
control
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PCT/JP2023/040689
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English (en)
Japanese (ja)
Inventor
辰夫 細野
真二 久保
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ニデック株式会社
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Publication of WO2024106361A1 publication Critical patent/WO2024106361A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/62—Controlling or determining the temperature of the motor or of the drive for raising the temperature of the motor

Definitions

  • the present invention relates to a method for controlling a drive device and a cooling device.
  • Patent Document 1 describes a cooling circuit that uses an oil pump to supply oil to heat-generating parts of an electric motor.
  • the output of the cooling device may be controlled based on the temperature of the motor, and the amount of refrigerant sent to the motor may be controlled.
  • the output of the cooling device may be changed based on the temperature of the motor and when the refrigerant actually reaches the motor.
  • the motor may not be sufficiently cooled if, for example, the temperature of the motor rises suddenly.
  • one of the objects of the present invention is to provide a drive device that can prevent the cooling of a motor by a cooling device from becoming insufficient, and a control method for a cooling device that can prevent the cooling of a motor from becoming insufficient.
  • One embodiment of the drive device of the present invention includes a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device.
  • the control device is capable of executing flow control that controls the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor.
  • the control device is capable of switching the flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value, and when the flow command value is the first flow command value, the control device switches the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value.
  • One aspect of the cooling device control method of the present invention is a method for controlling a cooling device that sends a refrigerant to a motor, and includes flow control for controlling the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor.
  • the flow control includes switching the flow command value from the first flow command value to a second flow command value equal to or greater than the first flow command value when the flow command value input to the cooling device is a first flow command value that varies based on the temperature of the motor and the torque command value becomes equal to or greater than the first torque command value.
  • the cooling device it is possible to prevent the cooling device from insufficiently cooling the motor in the drive device.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a drive device according to an embodiment.
  • FIG. 2 is a flowchart illustrating an example of a flow rate control procedure according to an embodiment.
  • FIG. 3 is a graph showing an example of the relationship between the first flow rate command value and the temperature of the motor in one embodiment.
  • FIG. 4 is a graph showing an example of changes over time of the torque command value, the flow command value, and the switching flag in the flow control of one embodiment.
  • the drive unit 100 of this embodiment shown in FIG. 1 is a drive unit that is mounted on a vehicle and rotates the vehicle's axle.
  • the drive unit 100 of this embodiment includes a drive unit main body 10, a cooling device 40, a cooler 50, a control device 60, and a temperature sensor 70.
  • the drive unit main body 10 has a housing 11, a motor 20, and a transmission device 30.
  • the drive unit 100 includes a housing 11, a motor 20, and a transmission device 30.
  • the housing 11 accommodates the motor 20 and the transmission device 30 inside.
  • the housing 11 has a storage section 12 in which oil O is stored as a refrigerant.
  • the storage section 12 is formed, for example, by a vertically lower portion of the housing 11 accommodation section in which the transmission device 30 is accommodated.
  • the oil O is used as a refrigerant to cool the motor 20.
  • the oil O is also used as a lubricant for the transmission device 30.
  • ATF Automatic Transmission Fluid
  • the motor 20 has a rotor 21 that can rotate around the central axis of the motor 20, and a stator 22 that faces the rotor 21 across a gap.
  • the rotor 21 has a shaft 21a that is connected to the transmission device 30.
  • the stator 22 has a coil 23.
  • the transmission device 30 is a device that transmits the rotation of the rotor 21 to the axle of the vehicle.
  • the transmission device 30 has a reduction gear 31 connected to the shaft 21a, and a differential gear 32 connected to the reduction gear 31.
  • the differential gear 32 is connected to the axle of the vehicle (not shown).
  • the differential gear 32 has a ring gear whose lower vertical end is immersed in the oil O stored in the storage section 12. As the ring gear rotates, a portion of the oil O in the storage section 12 is scooped up in the storage section of the housing 11 that houses the transmission device 30, and is supplied to the transmission device 30 as lubricating oil.
  • the cooling device 40 is a device that sends oil O as a refrigerant to the motor 20.
  • the cooling device 40 is a pump. More specifically, the cooling device 40 is an electric pump.
  • the cooling device 40 is attached to the housing 11.
  • the cooling device 40 has a pump drive unit 41, a pump mechanism unit 42, and a pump control unit 43.
  • the pump drive unit 41 is, for example, a motor controlled by the pump control unit 43.
  • the pump control unit 43 controls the pump drive unit 41 based on a flow command value FC input from the control device 60.
  • the pump mechanism 42 is driven by the pump drive unit 41 to send the oil O.
  • the pump mechanism 42 has, for example, an inner rotor rotated by the pump drive unit 41, and an outer rotor that surrounds the inner rotor and meshes with the inner rotor.
  • the pump mechanism 42 discharges the oil O drawn in from an intake port connected to the inside of the storage unit 12 to an outlet port connected to a flow path provided in the housing 11.
  • the oil O discharged by the pump mechanism 42 to the flow path flows through the flow path and is supplied to the motor 20.
  • the cooling device 40 sends the oil O as a refrigerant to the motor 20.
  • the cooling device 40 sends oil O to the rotor 21 and the stator 22.
  • the oil O sent to the motor 20 by the cooling device 40 accumulates, for example, in the housing 11, in the accommodating portion that accommodates the motor 20.
  • the oil O that accumulates in the housing 11, in the accommodating portion that accommodates the motor 20, returns to the reservoir 12 through a hole provided in the partition wall that separates the housing 11, in which the motor 20 is accommodated, from the accommodating portion of the transmission device 30.
  • the cooler 50 is attached to the housing 11.
  • the cooler 50 is provided midway through the flow path through which the oil O sent to the motor 20 flows.
  • the cooler 50 cools the oil O sent to the motor 20.
  • the oil O that flows from inside the reservoir 12 into the flow path of the housing 11 by the cooling device 40 is cooled by the cooler 50 before being supplied to the motor 20.
  • the oil O that flows into the cooler 50 is cooled by heat exchange with water W that flows into the drive unit 100 from the outside.
  • the water W that cools the oil O in the cooler 50 flows into the drive unit 100 from a radiator (not shown) mounted on the vehicle.
  • the water W that flows into the drive unit 100 passes through the control unit 60, cooling the control unit 60 before flowing into the cooler 50.
  • the temperature sensor 70 is a sensor capable of detecting the temperature Tm of the motor 20.
  • the temperature sensor 70 is attached to the coil 23 and detects the temperature of the coil 23.
  • the temperature Tm of the motor 20 detected by the temperature sensor 70 is the temperature of the coil 23.
  • the control device 60 controls the motor 20 and the cooling device 40.
  • the control device 60 has an inverter circuit that supplies a current Im to the motor 20.
  • the control device 60 controls the current Im supplied to the motor 20 based on a torque command value NC for the motor 20 input from a vehicle control unit ECU mounted on the vehicle. More specifically, the control device 60 controls the value of the current Im to a value at which the torque of the motor 20 becomes the torque command value NC input from the vehicle control unit ECU.
  • the current Im is supplied to the coil 23 of the motor 20.
  • the temperature Tm of the motor 20 detected by the temperature sensor 70 is input to the control device 60.
  • the rotation speed of the pump drive unit 41 may also be input to the control device 60 from the pump control unit 43 of the cooling device 40.
  • the control device 60 can execute flow control CF to control the cooling device 40.
  • the control method for the cooling device 40 includes flow control CF.
  • the flow control CF is a control that controls the flow rate of oil O, which serves as a refrigerant, sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20 and the torque command value NC of the motor 20.
  • the control device 60 always executes the flow control CF, for example, while the drive device 100 is being driven. Note that the control device 60 may not execute the flow control CF when a predetermined condition is satisfied, and may execute a control different from the flow control CF to control the cooling device 40 when the flow control CF is not executed.
  • the control device 60 controls the cooling device 40 according to the flowchart shown in FIG. 2.
  • the control device 60 first inputs a first flow command value FC1 to the cooling device 40 as a flow command value FC (step S1).
  • the first flow command value FC1 is a value that varies based on the temperature Tm of the motor 20.
  • the control device 60 varies the value of the first flow command value FC1 based on the temperature Tm of the motor 20 input from the temperature sensor 70.
  • FIG. 3 is a graph showing an example of the relationship between the first flow command value FC1 and the temperature Tm of the motor 20 in this embodiment.
  • the horizontal axis indicates the temperature Tm of the motor 20, and the vertical axis indicates the first flow command value FC1.
  • the first flow command value FC1 is constant at a value FCa.
  • the value FCa is the minimum value of the first flow command value FC1.
  • the temperature Ta is not particularly limited.
  • the temperature Ta is, for example, about 0° C. or more and 20° C. or less.
  • the value FCa, which is the minimum value of the first flow command value FC1 is not particularly limited.
  • the value FCa is, for example, about 1.0 [L/min] or more and 5.0 [L/min] or less.
  • the first flow command value FC1 is constant at the value FCb.
  • the temperature Tb is higher than the temperature Ta.
  • the temperature Tc is higher than the temperature Tb.
  • the value FCb is greater than the value FCa.
  • the first flow command value FC1 is constant at the value FCc.
  • the temperature Td is higher than the temperature Tc.
  • the temperature Te is higher than the temperature Td.
  • the value FCc is greater than the value FCb.
  • the first flow command value FC1 is constant at a value FCd.
  • the temperature Tf is higher than the temperature Te.
  • the temperature Tf corresponds to the "first temperature”.
  • the temperature Tf which is the first temperature, is not particularly limited.
  • the temperature Tf is, for example, equal to or higher than 80°C and equal to or lower than 120°C.
  • the value FCd is greater than the value FCc.
  • the value FCd is the maximum value of the first flow command value FC1.
  • the value FCd which is the maximum value of the first flow command value FC1, is not particularly limited.
  • the value FCd is, for example, equal to or higher than 8.0 [L/min] and equal to or lower than 12.0 [L/min].
  • the first flow command value FC1 changes linearly between the values FCa and FCb, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 changes linearly between the values FCb and FCc, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 changes linearly between the values FCc and FCd, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf is smaller than the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the temperature Tf, i.e., the value FCd.
  • the control device 60 determines whether the torque command value NC is equal to or greater than the first torque command value NC1 (step S2).
  • the first torque command value NC1 is not particularly limited.
  • the first torque command value NC1 is a constant value.
  • the first torque command value NC1 is, for example, a torque command value NC that is relatively large.
  • the first torque command value NC1 is, for example, a value that is 50% or more and less than 100% of the maximum value of the torque command value NC. More preferably, the first torque command value NC1 is, for example, a value that is within a range of 60% or more and 90% or less of the maximum value of the torque command value NC.
  • step S2 If the torque command value NC is smaller than the first torque command value NC1 (step S2: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the first flow command value FC1. On the other hand, if the torque command value NC is equal to or greater than the first torque command value NC1 (step S2: YES), the control device 60 inputs the second flow command value FC2 as the flow command value FC to the cooling device 40 (step S3). That is, in the flow control CF, when the flow command value FC is the first flow command value FC1, if the torque command value NC becomes equal to or greater than the first torque command value NC1, the control device 60 switches the flow command value FC from the first flow command value FC1 to the second flow command value FC2.
  • the flow control CF includes switching the flow command value FC from the first flow command value FC1 to the second flow command value FC2 when the torque command value NC becomes equal to or greater than the first torque command value NC1 when the flow command value FC input to the cooling device 40 is the first flow command value FC1.
  • the second flow command value FC2 is a value equal to or greater than the first flow command value FC1.
  • the second flow command value FC2 is a constant value.
  • the second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf.
  • the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or greater than the temperature Tf, and is the same value as the maximum value of the first flow command value FC1, i.e., value FCd.
  • the second flow command value FC2 is greater than the first flow command value FC1, except when the first flow command value FC1 is the maximum value.
  • the control device 60 determines whether the torque command value NC has been equal to or less than the second torque command value NC2 for a predetermined time Pt (step S4).
  • the second torque command value NC2 is a constant value.
  • the second torque command value NC2 is smaller than the first torque command value NC1.
  • the difference between the first torque command value NC1 and the second torque command value NC2 is relatively small.
  • the maximum value of the torque command value NC is 100%, the difference between the first torque command value NC1 and the second torque command value NC2 is, for example, about 3% or more and 10% or less.
  • the predetermined time Pt is, for example, about 5 seconds or more and 100 seconds or less.
  • the control device 60 starts counting the predetermined time Pt when the torque command value NC becomes equal to or less than the second torque command value NC2. If the torque command value NC becomes greater than the second torque command value NC2 before the predetermined time Pt has elapsed, the control device 60 stops counting the predetermined time Pt and returns the count to zero. If the torque command value NC becomes equal to or less than the second torque command value NC2 again, the control device 60 starts counting the predetermined time Pt again.
  • step S4 If the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has not elapsed continuously (step S4: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the second flow command value FC2. On the other hand, if the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed continuously (step S4: YES), the control device 60 inputs the first flow command value FC1 as the flow command value FC to the cooling device 40 (step S1).
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. More specifically, in the flow control CF, when the flow command value FC is the second flow command value FC2, if the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1.
  • the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the torque command value NC is equal to or less than the second torque command value NC2. More specifically, the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more.
  • the control device 60 can switch the flow command value FC input to the cooling device 40 between a first flow command value FC1 that varies based on the temperature Tm of the motor 20, and a second flow command value FC2 that is equal to or greater than the first flow command value FC1.
  • the control device 60 repeatedly performs steps S1 to S4 described above to control the cooling device 40 based on the temperature Tm of the motor 20 and the torque command value NC, and controls the flow rate of oil O sent to the motor 20.
  • the control device 60 switches the flow command value FC between a first flow command value FC1 and a second flow command value FC2, for example, by switching the switching flag FL between 0 and 1.
  • the control device 60 sets the flow command value FC to the first flow command value FC1.
  • the control device 60 sets the flow command value FC to the second flow command value FC2.
  • the control device 60 switches the switching flag FL based on the torque command value NC, and switches the flow command value FC as described above.
  • FIG. 4 is a graph showing an example of the change over time of the torque command value NC, the flow command value FC, and the switching flag FL in the flow control CF.
  • Three graphs are shown arranged vertically in FIG. 4.
  • the top graph in FIG. 4 is a graph showing an example of the change over time of the torque command value NC.
  • the horizontal axis indicates time t
  • the vertical axis indicates the torque command value NC.
  • the center graph in FIG. 4 is a graph showing an example of the change over time of the flow command value FC.
  • the horizontal axis indicates time t
  • the vertical axis indicates the flow command value FC.
  • the bottom graph in FIG. 4 is a graph showing an example of the change over time of the switching flag FL.
  • the horizontal axis indicates time t
  • the vertical axis indicates the switching flag FL.
  • the torque command value NC is smaller than the first torque command value NC1, and the flow command value FC is the first flow command value FC1.
  • the switching flag FL is 0, and the value of the first flow command value FC1 is the value FCc.
  • the switching flag FL is switched to 1
  • the flow command value FC is switched to the second flow command value FC2.
  • the value of the second flow command value FC2 is constant at the value FCd, so that at time t1 the flow command value FC increases from the value FCc to the value FCd.
  • the control device 60 starts counting the predetermined time Pt. Note that there is a period of time after time t1 and before time t2 when the torque command value NC is smaller than the first torque command value NC1, but since the torque command value NC is greater than the second torque command value NC2 during this period, counting the predetermined time Pt does not start.
  • the torque command value NC remains equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed since time t2 at time t3, the switching flag FL becomes 0, and the flow command value FC is switched to the first flow command value FC1.
  • the first flow command value FC1 is equal to the value FCc. Between time t4 and time t5, the first flow command value FC1 decreases linearly from the value FCc to the value FCb. Between time t5 and time t6, the first flow command value FC1 is equal to the value FCb. In other words, between time t3 and time t6, the temperature Tm of the motor 20 decreases, and the first flow command value FC1 changes from the value FCc to the value FCb.
  • the flow command value FC fluctuates based on the temperature Tm of the motor 20, and when the torque command value NC becomes a relatively large value, i.e., equal to or greater than the first torque command value NC1, the flow command value FC is forcibly set to a large constant value, i.e., the second flow command value FC2.
  • the flow command value FC2 is the same value as the maximum value of the first flow command value FC1
  • the torque command value NC becomes equal to or greater than the first torque command value NC1
  • the flow command value FC is forcibly set to the same value as the maximum value of the first flow command value FC1, which fluctuates based on the temperature Tm of the motor 20.
  • the control device 60 switches the flow command value FC from the first flow command value FC1, which varies based on the temperature Tm of the motor 20, to a second flow command value FC2 equal to or greater than the first flow command value FC1. Therefore, when the torque command value NC becomes equal to or greater than the first torque command value NC1, the flow command value FC input to the cooling device 40 can be set to the second flow command value FC2 equal to or greater than the first flow command value FC1 based on the temperature Tm of the motor 20, regardless of the temperature Tm of the motor 20.
  • the control device 60 varies the amount of oil O sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20. Therefore, when the torque command value NC is relatively small and the temperature Tm of the motor 20 is unlikely to rise suddenly, it is possible to prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it is possible to prevent an increase in the power consumed by the cooling device 40, and to prevent an increase in the power consumed by the drive device 100.
  • the torque command value NC becomes larger than during normal driving, and the temperature Tm of the motor 20 is likely to rise sharply.
  • the flow rate of oil O sent from the cooling device 40 is controlled based only on the temperature Tm of the motor 20, the increase in the flow rate of oil O will not be able to keep up, as described above, and the cooling of the motor 20 will likely not be able to keep up.
  • the cooling device 40 is controlled based not only on the temperature Tm of the motor 20 but also on the torque command value NC, so that when the driver depresses the accelerator pedal deeply and the torque command value NC becomes larger than during normal driving, the flow rate of oil O can be forcibly increased regardless of the temperature Tm of the motor 20, and it is possible to prevent the cooling of the motor 20 from not being able to keep up.
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, when the torque command value NC becomes small and it is no longer necessary to forcibly increase the flow rate of the oil O sent to the motor 20, the control can be returned to one in which the flow rate of the oil O sent to the motor 20 varies based on the temperature Tm of the motor 20. This can further prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it can further prevent the power consumed by the cooling device 40 from increasing, and can further prevent the power consumed by the drive device 100 from increasing.
  • the second torque command value NC2 is smaller than the first torque command value NC1. Therefore, for example, even if the torque command value NC is unstable and repeatedly rises and falls near the first torque command value NC1 after the torque command value NC becomes equal to or greater than the first torque command value NC1 and the flow command value FC becomes the second flow command value FC2, the flow command value FC will not be switched unless the torque command value NC becomes equal to or less than the second torque command value NC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 within a short period of time. Therefore, it is possible to prevent a load from being applied to the cooling device 40.
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, even if the torque command value NC becomes equal to or less than the second torque command value NC2, the flow command value FC does not immediately switch to the first flow command value FC1.
  • the torque command value NC may repeatedly change between a value equal to or greater than the first torque command value NC1 and a value equal to or less than the second torque command value NC2 in a short period of time.
  • the flow command value FC is immediately returned to the first flow command value FC1 when the torque command value NC becomes equal to or less than the second torque command value NC2
  • the flow command value FC will be frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time.
  • the flow command value FC will not return to the first flow command value FC1 until a predetermined time Pt has elapsed. Therefore, for example, when the accelerator pedal is repeatedly depressing the accelerator pedal heavily in a short period of time, it is possible to maintain the flow command value FC at the second flow command value FC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time. Therefore, it is possible to further prevent the load on the cooling device 40.
  • the second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf. Therefore, when the flow command value FC is switched from the first flow command value FC1 to the second flow command value FC2, it is easy to suitably increase the flow rate of the oil O sent to the motor 20.
  • the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the first temperature Tf, and is the same value as the maximum value of the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent from the cooling device 40 to the motor 20 can be set to the same flow rate as the maximum flow rate based on the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent to the motor 20 can be more suitably increased.
  • the control device 60 executes the above-described flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg.
  • the temperature Tg corresponds to a second temperature lower than the temperature Tf, which is the first temperature. As shown in FIG. 3, the temperature Tg is lower than the temperature Ta.
  • the temperature Tg is not particularly limited.
  • the temperature Tg is, for example, about ⁇ 40° C. or higher and ⁇ 20° C. or lower.
  • the first flow command value FC1 is the value FCa, so that even when the temperature Tm of the motor 20 is equal to or lower than the temperature Tg, the first flow command value FC1 is the value FCa.
  • the first flow command value FC1 is the minimum value of the first flow command value FC1.
  • the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, the temperature Tm of the motor 20 is unlikely to rise, or is unlikely to rise to a temperature that causes problems. Therefore, when the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, there may be cases where it is not necessary to forcibly increase the flow rate of the oil O. Therefore, by executing the flow rate control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, and not executing the flow rate control CF when the temperature Tm of the motor 20 is lower than the temperature Tg, it is possible to prevent the flow rate of the oil O from increasing unnecessarily. This makes it possible to further prevent an increase in the power consumed by the cooling device 40, and to further prevent an increase in the power consumed by the drive device 100.
  • the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the second temperature Tg is the minimum value of the first flow command value FC1.
  • the temperature Tm of the motor 20 is lower than the temperature Tg, the amount of oil O that needs to be supplied to the motor 20 is small. Therefore, in the range in which the temperature Tm of the motor 20 is lower than the temperature Tg, the cooling of the motor 20 is unlikely to be insufficient even if the flow control CF is not executed. Therefore, by executing the flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, the flow control CF can be executed more suitably within the required range.
  • the control device may have any configuration and may be capable of performing any type of control, so long as it is a device that controls the cooling device and is capable of performing flow control to control the flow rate of refrigerant sent from the cooling device to the motor based on the motor temperature and the motor torque command value.
  • the control device does not have to control the motor.
  • a device that controls the motor may be provided separately from a control device that is capable of performing flow control and controls the cooling device.
  • the control device may be provided integrally with the cooling device.
  • the control device may be capable of executing other control that controls the flow rate of the refrigerant sent from the cooling device to the motor, which is different from the flow rate control that controls the flow rate of the refrigerant based on the motor temperature and torque command value.
  • the other control may be control of the flow rate of the refrigerant based only on the motor temperature, or may be control of the flow rate of the refrigerant based on other parameters.
  • the control device may decide based on what conditions whether or not to execute flow rate control.
  • the flow control controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value
  • the flow control includes at least a calculation that uses the motor temperature as a parameter and a calculation that uses the motor torque command value as a parameter.
  • the flow control that controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value may be any type of control as long as, when the flow rate command value is the first flow rate command value, the flow rate command value can be switched from the first flow rate command value to the second flow rate command value when the torque command value becomes equal to or greater than the first torque command value.
  • the flow rate control may be a control that immediately switches the flow rate command value to the first flow rate command value when the flow rate command value is the second flow rate command value and the torque command value becomes equal to or less than the second torque command value.
  • the second torque command value may be the same value as the first torque command value.
  • the flow control may be a control in which, when the flow command value is the second flow command value, the flow command value is switched to the first flow command value based on a parameter other than the torque command value.
  • the flow control may be a control in which, after the flow command value is switched to the second flow command value, the flow command value is switched to the first flow command value based on the temperature of the motor.
  • the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature when the flow command value is the second flow command value.
  • the flow control may be a control in which, after the flow command value is switched to the second flow command value, the control device may switch the flow command value to the first flow command value based on both the temperature of the motor and the torque command value of the motor.
  • the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature and the torque command value is equal to or lower than a predetermined value when the flow command value is the second flow command value.
  • the first flow command value may vary in any manner based on the temperature of the motor.
  • the second flow command value may be any value equal to or greater than the first flow command value.
  • the second flow command value may be greater than the maximum value of the first flow command value.
  • the second flow command value may not be a constant value, but may be a variable value. In this case, in flow control, when the flow command value is the second flow command value, the control device may vary the second flow command value based on the temperature of the motor.
  • Each control, including the flow control, performed by the control device described above may be control realized by hardware including digital circuits and analog circuits, or may be control realized by software, i.e., control realized by the control device executing a program, or may be control realized by hardware and software.
  • the cooling device may be any device that sends a refrigerant to the motor.
  • the refrigerant sent to the motor by the cooling device may be any type of refrigerant.
  • the refrigerant does not have to be oil and may be water.
  • the drive unit to which the present invention is applied is not particularly limited.
  • the drive unit may be mounted on a vehicle for a purpose other than rotating an axle, or may be mounted on equipment other than a vehicle.
  • the present technology may be configured as follows: (1) A drive device including a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device, the control device being capable of executing flow control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the control device being capable of switching a flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value in the flow control, and switching the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value when the flow command value is the first flow command value.
  • a control method for a cooling device that supplies a refrigerant to a motor comprising flow rate control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the flow rate control comprising, when a flow rate command value input to the cooling device is a first flow rate command value that varies based on the temperature of the motor, switching the flow rate command value from the first flow rate command value to a second flow rate command value that is equal to or greater than the first flow rate command value when the torque command value becomes equal to or greater than the first torque command value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Ce dispositif d'entraînement est équipé d'un moteur, d'un dispositif de refroidissement pour envoyer un fluide de refroidissement au moteur, et d'un dispositif de commande pour commander le dispositif de refroidissement. Le dispositif de commande est apte à exécuter une commande de flux pour commander le flux du fluide de refroidissement délivré au moteur à partir du dispositif de refroidissement sur la base de la température du moteur et d'une valeur de commande de couple du moteur. Pendant la commande de flux, le dispositif de commande est apte à commuter une valeur de commande de flux à entrer dans le dispositif de refroidissement entre une première valeur de commande de flux qui change sur la base de la température de moteur et une seconde valeur de commande de flux qui est supérieure ou égale à la première valeur de commande de flux, et lorsque la valeur de commande de flux est la première valeur de commande de flux, il commute la valeur de commande de flux de la première valeur de commande de flux à la seconde valeur de commande de flux si la valeur de commande de couple est supérieure ou égale à la première valeur de commande de couple.
PCT/JP2023/040689 2022-11-15 2023-11-13 Dispositif d'entraînement et procédé de commande de dispositif de refroidissement WO2024106361A1 (fr)

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JP2022182384 2022-11-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006074962A (ja) * 2004-09-06 2006-03-16 Nissan Motor Co Ltd 電動機用冷却装置
JP2006187105A (ja) * 2004-12-27 2006-07-13 Nissan Motor Co Ltd 回転電機の冷却装置
JP2013198378A (ja) * 2012-03-22 2013-09-30 Mitsubishi Motors Corp 電動モータ
JP2020200900A (ja) * 2019-06-11 2020-12-17 株式会社ミツバ 自動車のトランスミッションのクラッチ係合用電動オイルポンプ、自動車のトランスミッションのクラッチ係合用電動オイルポンプ制御方法、車両及び自動車のトランスミッションのクラッチ係合車両用電動オイルポンプ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006074962A (ja) * 2004-09-06 2006-03-16 Nissan Motor Co Ltd 電動機用冷却装置
JP2006187105A (ja) * 2004-12-27 2006-07-13 Nissan Motor Co Ltd 回転電機の冷却装置
JP2013198378A (ja) * 2012-03-22 2013-09-30 Mitsubishi Motors Corp 電動モータ
JP2020200900A (ja) * 2019-06-11 2020-12-17 株式会社ミツバ 自動車のトランスミッションのクラッチ係合用電動オイルポンプ、自動車のトランスミッションのクラッチ係合用電動オイルポンプ制御方法、車両及び自動車のトランスミッションのクラッチ係合車両用電動オイルポンプ

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