Drive apparatus

Abstract

To suppress an excessive temperature rise of a motor or an inverter caused by temperature rise d-axis control.SOLUTION: A drive apparatus comprises: a motor; an inverter which drives the motor; a power storage device which is connected to the inverter via a power line; a cooling device which circulates cooling water in a circulation passage including the motor, the inverter and the power storage device; and a control device which controls the inverter and the cooling device. When executing temperature rise d-axis control for controlling the inverter in such a manner that a d-axis current flows only to the motor together with actuation of the cooling device in response to a temperature rise request of the power storage device, in a case where a temperature of the cooling water is lower than a first temperature threshold, the control device controls the inverter so as to reduce the d-axis current flowing to the motor in relative to a case where the temperature of the cooling water is equal to or higher than the first temperature threshold.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a drive device. [Background technology]

[0002] In a conventional drive device that includes a motor, an inverter that drives the motor, a power storage device connected to the inverter via a power line, and a capacitor attached to the power line, a device has been proposed that performs switching control of the inverter so that a d-axis current flows between the power storage device and the motor when it is necessary to increase the temperature of the power storage device (see, for example, Patent Document 1). In this drive device, the power storage device is charged and discharged and its temperature is increased by increasing and decreasing the d-axis current using resonance between the capacitor and the inductance components of the power storage device, the power line, the inverter, and the conductive members of the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-038755 Summary of the Invention [Problem to be solved by the invention]

[0004] In a drive device including a motor, an inverter that drives the motor, a power storage device connected to the inverter via a power line, and a cooling device that circulates coolant through a circulation flow path that includes the motor, the inverter, and the power storage device, when a temperature-rise d-axis control is performed in which the cooling device is operated in response to a temperature-rise request from the power storage device and the inverter is controlled so that only a d-axis current flows through the motor, current may flow concentratedly in specific phases of the motor or inverter, causing heat generation and a large temperature rise in the motor and inverter compared to when the coolant temperature is high, and the viscosity of the coolant is likely to be high when the coolant temperature is low, making it difficult for the coolant to circulate through the circulation flow path, which makes it difficult for the battery to heat up and increases the temperature of the motor and inverter.

[0005] The main purpose of the drive device of the present disclosure is to prevent excessive temperature rise in the motor and inverter due to temperature rise d-axis control. [Means for solving the problem]

[0006] The driving device of the present disclosure employs the following means to achieve the above-mentioned main object.

[0007] [1] The drive device of the present disclosure is A drive device including a motor, an inverter that drives the motor, a power storage device connected to the inverter via a power line, a cooling device that circulates cooling water through a circulation flow path that includes the motor, the inverter, and the power storage device, and a control device that controls the inverter and the cooling device, When the control device executes temperature rise d-axis control to control the inverter so that only a d-axis current flows to the motor together with operation of the cooling device in response to a temperature rise request for the power storage device, and when the temperature of the coolant is less than a first temperature threshold, the control device controls the inverter so that the d-axis current flowing to the motor is smaller than when the temperature of the coolant is equal to or higher than the first temperature threshold. The gist of this is as follows.

[0008] In the drive device of the present disclosure, when a request to increase the temperature of the power storage device is made and the cooling device is operated, and temperature increase d-axis control is performed to control the inverter so that only d-axis current flows through the motor, when the coolant temperature is below a first temperature threshold, the inverter is controlled to reduce the d-axis current flowing through the motor compared to when the coolant temperature is equal to or higher than the first temperature threshold, thereby making it possible to prevent excessive temperature increases in the motor and inverter due to the temperature increase d-axis control.

[0009] [2] In the drive device of the present disclosure (the drive device described in [1] above), when the control device performs the heating d-axis control together with the operation of the cooling device, when the temperature of the cooling water is below the first temperature threshold or the temperature of the power storage device is equal to or higher than a second temperature threshold higher than the first temperature threshold, the control device may control the inverter so that the d-axis current flowing to the motor is smaller than when the temperature of the cooling water is equal to or higher than the first temperature threshold and the temperature of the power storage device is below the second temperature threshold.

[0010] [3] In the drive device of the present disclosure (the drive device described in [1] or [2] above), when performing the heating d-axis control, the control device may set a duty so that when the temperature of the coolant is below a first temperature threshold, the duty is smaller than when the temperature of the coolant is equal to or higher than the first temperature threshold, set the product of the duty and a reference current value as a d-axis current command, and set a value of 0 as a q-axis current command, and control the inverter so that differences between the d-axis current and the q-axis current and the d-axis current command and the q-axis current command are canceled out.

[0011] [4] In the drive device (the drive device described in any one of [1] to [3] above) of the present disclosure, the drive device is capable of external charging, which charges the power storage device using electric power from an external power source, and the control device may execute the temperature rise d-axis control together with the operation of the cooling device during the external charging and when a request to increase the temperature of the power storage device is made. In this way, excessive temperature increases in the motor and inverter due to the temperature rise d-axis control can be suppressed during external charging. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of an electric vehicle 20 equipped with a drive device according to an embodiment of the present disclosure and a charging station 80. FIG. [Figure 2] 10 is a flowchart illustrating an example of a processing routine. [Figure 3] 10 is a flowchart showing an example of temperature rise d-axis control. [Figure 4] 10 is a flowchart illustrating an example of a current command setting process. [Figure 5] FIG. 10 is an explanatory diagram showing an example of a state in which a request to increase the temperature of the battery 36 is made during external charging. DETAILED DESCRIPTION OF THE INVENTION

[0013] A mode (embodiment) for carrying out the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic diagram of an electric vehicle 20 equipped with a drive device according to an embodiment of the present disclosure, and a charging station 80. As shown in the figure, the electric vehicle 20 includes a motor 32, an inverter 34, a battery 36 serving as a power storage device, a vehicle connector 39, a cooling device 40, and a vehicle electronic control unit (hereinafter referred to as "vehicle ECU") 50 serving as a control device.

[0014] The motor 32 is configured as a three-phase AC motor and includes a rotor with a permanent magnet embedded in the rotor core and a stator with a three-phase coil wound around the stator core. The rotor of the motor 32 is connected to a drive shaft 26 that is connected to the drive wheels 22 a, 22 b via a differential gear 24.

[0015] The inverter 34 is used to drive the motor 32 and is connected to the battery 36 via a power line 37. The inverter 34 includes six switching elements, namely, transistors T11 to T16, and six diodes D11 to D16. The transistors T11 to T16 are arranged in pairs, two at a time, on the source side and two at the sink side of the positive and negative lines of the power line 37. The junctions of the paired transistors T11 to T16 are connected to the three-phase (U-phase, V-phase, W-phase) coils of the motor 32, respectively. The six diodes D11 to D16 are connected in parallel to the six transistors T11 to T16, respectively. When a voltage is applied to the inverter 34, the vehicle ECU 50 adjusts the proportion of the on-time of the paired transistors T11 to T16, thereby generating a rotating magnetic field in the three-phase coils and driving the motor 32 to rotate.

[0016] The battery 36 is configured as a lithium ion secondary battery or a nickel-metal hydride secondary battery, and as described above, is connected to the inverter 34 via the power line 37. A smoothing capacitor 38 is attached to the power line 37.

[0017] The vehicle connector 39 is connected to the power line 37 and is configured to be connectable to a stand connector 84 of a charging stand 80. The charging stand 80 is provided at a charging point such as a home or a charging station. When the vehicle connector 39 and the stand connector 84 are connected, the electric vehicle 20 can charge the battery 36 using power from the charging stand 80.

[0018] The cooling device 40 has a circulation flow path 42, a radiator 44, and an electric pump 46. The circulation flow path 42 is configured as a flow path for circulating the cooling water through the motor 32, the inverter 34, the battery 36, and the radiator 44 in this order. The electric pump 46 circulates the cooling water through the circulation flow path 42. Note that the circulation flow path 42 may also be configured as a flow path for circulating the cooling water through the inverter 34, the motor 32, the battery 36, and the radiator 44 in this order.

[0019] The vehicle ECU 50 includes a microcomputer having a CPU, ROM, RAM, flash memory, input / output ports, and communication ports, as well as various drive circuits and logic ICs. The vehicle ECU 50 receives signals from various sensors via its input ports. For example, the vehicle ECU 50 receives a rotational position θm from a rotational position sensor 32a that detects the rotational position of the rotor of the motor 32, and phase currents Iu, Iv, and Iw from current sensors 32u, 32v, and 32w that detect the phase currents of the respective phases of the motor 32. The vehicle ECU 50 also receives a temperature αm from a temperature sensor 32t attached to the motor 32 and a temperature αi from a temperature sensor 34t attached to the inverter 34. The vehicle ECU 50 also receives a voltage Vb from a voltage sensor 36v attached between the terminals of the battery 36, a current Ib from a current sensor 36i attached to the output terminal of the battery 36, and a temperature αb from a temperature sensor 36t attached to the battery 36. Vehicle ECU 50 also receives as inputs a voltage VH of capacitor 38 (power line 37) from a voltage sensor 38v attached between the terminals of capacitor 38, and a coolant temperature αw from a temperature sensor 48 attached to circulation flow path 42 of cooling device 40. Vehicle ECU 50 also receives as inputs a start signal from a power switch 60, a shift position SP from a shift sensor 62 that detects the operating position of a shift lever 61, an accelerator opening Acc from an accelerator pedal position sensor 64 that detects the amount of depression of an accelerator pedal 63, a brake pedal position BP from a brake pedal position sensor 66 that detects the amount of depression of a brake pedal 65, and a vehicle speed V from a vehicle speed sensor 67.

[0020] The vehicle ECU 50 outputs various control signals via the output port. For example, the vehicle ECU 50 outputs a control signal to the transistors T11 to T16 of the inverter 34 and a control signal to the electric pump 46 of the cooling device 40. The vehicle ECU 50 calculates the electrical angle θe and rotation speed Nm of the motor 32 based on the rotational position θm of the rotor of the motor 32. The vehicle ECU 50 calculates the power storage rate SOC of the battery 36 based on the integrated value of the current Ib of the battery 36, and calculates an input limit Win, which is the allowable input power, based on the power storage rate SOC and temperature αb of the battery 36. The input limit Win is set so that its absolute value decreases as the temperature αb of the battery 36 moves away from the lower side of the allowable temperature range. The vehicle ECU 50 is capable of communicating with an electronic control unit (hereinafter referred to as "stand ECU") 88 of a charging stand 80 at the charging point.

[0021] The charging stand 80 includes a power supply device 82, a stand connector 84, and a stand ECU 88. The power supply device 82 is connected to the stand connector 84 via a power line 86. The power supply device 82 is configured to convert AC power from the power grid into DC power and to output the DC power after adjusting the output voltage and power. The stand connector 84 is configured to be connectable to the vehicle connector 39 of the electric vehicle 20.

[0022] The stand ECU 88 includes a microcomputer, similar to the vehicle ECU 50. The stand ECU 88 receives signals from various sensors via an input port. For example, the stand ECU 88 receives the output voltage Vs of the power supply device 82 from a voltage sensor and the output current Is of the power supply device 82 from a current sensor. The stand ECU 88 outputs various control signals via an output port. For example, the stand ECU 88 outputs a control signal to the power supply device 82. The stand ECU 88 calculates the output power Ps based on the output voltage Vs and the output current Is. The stand ECU 88 is capable of communicating with the vehicle ECU 50.

[0023] In the electric vehicle 20 according to the embodiment, when the vehicle connector 39 and the stand connector 84 are connected while the vehicle is parked at a charging point and a charging start condition is met, the power supply device 82 of the charging stand 80 starts supplying power, and external charging, which is charging of the battery 36 using power from the power supply device 82, is started. When a charging end condition is subsequently met, the power supply from the power supply device 82 of the charging stand 80 ends, and external charging is ended. The charging start condition may be, for example, a condition in which a user issues an instruction to start external charging. The charging end condition may be, for example, a condition in which the state of charge (SOC) of the battery 36 reaches a predetermined state of charge (Sfl) near full charge. During external charging, the vehicle ECU 50 transmits to the stand ECU 88 a charging request current Ireq based on the state of charge (SOC) of the battery 36, an input limit Win, and power consumption of the motor 32 as a result of temperature rise d-axis control (described later). The stand ECU 88 then controls the power supply device 82 so that the output current Is becomes the charging request current Ireq.

[0024] Next, the operation of the electric vehicle 20 of this embodiment, particularly the operation during external charging, will be described. Figure 2 is a flowchart showing an example of a processing routine executed by the vehicle ECU 50. This routine is repeatedly executed during external charging.

[0025] 2, the vehicle ECU 50 first determines whether a temperature increase request for the battery 36 has been made (step S100). Here, a temperature increase request for the battery 36 is made when, for example, the temperature αb of the battery 36 is equal to or lower than the threshold value αbref1. If it is determined that a temperature increase request for the battery 36 has not been made, this routine ends. In this case, the cooling device 40 and the motor 32 are stopped or kept stopped.

[0026] If it is determined in step S100 that a temperature increase request for the battery 36 has been made, the cooling device 40 is operated (step S110), and the temperature increase d-axis control of FIG. 3 is executed (step S120), and this routine ends. Here, in operation of the cooling device 40, the electric pump 46 is controlled so that the coolant circulates through the circulation flow path 42. In the temperature increase d-axis control, the inverter 34 is controlled by pulse width modulation control (PWM control) so that only the d-axis current flows through the motor 32. As a result, heat from the motor 32 and the inverter 34 is transferred to the battery 36 via the cooling device 40 (coolant) without generating torque from the motor 32, and the temperature increase of the battery 36 is promoted.

[0027] Next, the heating d-axis control of Fig. 3 will be described. In the heating d-axis control of Fig. 3, the vehicle ECU 50 first calculates d-axis and q-axis currents Id and Iq by performing coordinate transformation (three-phase to two-phase transformation) on the phase currents Iu, Iv, and Iw of each phase of the motor 32 using the electrical angle θe of the motor 32 (step S200), and then sets the d-axis and q-axis current commands Id* and Iq* using the current command setting process of Fig. 4 (step S210). After obtaining the d-axis and q-axis currents Id and Iq and the d-axis and q-axis current commands Id* and Iq* in this manner, the vehicle ECU 50 calculates d-axis and q-axis voltage commands Vd* and Vq* using current feedback control so that differences between the d-axis and q-axis currents Id and Iq and the d-axis and q-axis current commands Id* and Iq* are canceled out (step S220). Next, the d-axis and q-axis voltage commands Vd* and Vq* are subjected to coordinate transformation (two-phase to three-phase transformation) using the electrical angle θe of the motor 32 to calculate the phase voltage commands Vu*, Vv*, and Vw for each phase (step S230). Then, PWM signals for the transistors T11-T16 of the inverter 34 are generated by comparing the phase voltage commands Vu*, Vv*, and Vw* with a carrier wave (triangular wave) (step S240). The generated PWM signals for the transistors T11-T16 are used to control the switching of the transistors T11-T16 (step S250), thereby completing the d-axis heating control. Note that, because the motor 32 is stopped during external charging, the execution of the d-axis heating control may cause current to flow concentratedly in specific phases of the motor 32 and the inverter 34, potentially resulting in significant heat generation and temperature rise in the motor 32 and the inverter 34.

[0028] Next, the current command setting process of Fig. 4 will be described. In the current command setting process of Fig. 4, the vehicle ECU 50 determines whether the coolant temperature αw is less than the threshold value αwref (step S300) and whether the temperature αb of the battery 36 is equal to or greater than the threshold value αbref2 (step S310). Here, the threshold value αwref is a threshold value used to determine whether or not the first environment is in effect. The first environment is an environment in which the viscosity of the coolant is relatively high and the coolant does not circulate easily through the circulation flow path 42, making it difficult for the temperature of the battery 36 to increase and the temperatures of the motor 32 and the inverter 34 to increase significantly. The threshold value αbref2 is a threshold value used to determine whether or not the second environment is in effect. The second environment is an environment in which the temperature αb of the battery 36 is relatively high and the temperature increase of the battery 36 may be slowed down. The threshold value αbref2 is set to a temperature that is somewhat lower than the above-mentioned threshold value αbref1 and somewhat higher than the threshold value αwref.

[0029] If it is determined in step S300 that the coolant temperature αw is equal to or greater than the threshold value αwref and if it is determined in step S310 that the temperature αb of the battery 36 is less than the threshold value αbref, it is determined that the environment is neither the first nor the second. In this case, the duty D is set to a relatively large predetermined value D1 within a range equal to or less than 1 (step S320), the d-axis current command Id* is set to the product of the reference current value Id1 and the duty D, and the q-axis current command Iq* is set to 0 (step S350), and the current command setting process ends. Here, the reference current value Id1 may be a constant value, or may be a value based on at least one of the temperature αb of the battery 36, the input limit Win, and the temperatures αm and αi of the motor 32 and the inverter 34.

[0030] If it is determined in step S300 that the cooling water temperature αw is less than the threshold value αwref, it is determined that the first environment exists, and the duty D is set to a predetermined value D2 smaller than the predetermined value D1 (step S330), the d-axis current command Id* is set to the product of the reference current value Id1 and the duty D, and the q-axis current command Iq* is set to 0 (step S350), and the current command setting process ends. Through this control, when the first environment exists, the d-axis current Id flowing through the motor 32 becomes smaller than when the environment is neither the first nor the second. Therefore, when the first environment exists, it is possible to prevent the temperature of the motor 32 and the inverter 34 from rising excessively.

[0031] If it is determined in step S310 that the temperature αb of the battery 36 is equal to or greater than the threshold αbref, the system determines that the environment is the second environment, sets the duty D to a predetermined value D3 smaller than the predetermined value D1 (step S340), sets the d-axis current command Id* to the product of the reference current value Id1 and the duty D, and sets the q-axis current command Iq* to 0 (step S350), and terminates the current command setting process. Here, the predetermined value D3 may be the same as or different from the predetermined value D2. By such control, when the environment is the second environment, the d-axis current Id flowing through the motor 32 is smaller than when the environment is neither the first nor the second. Therefore, when the environment is the second environment, it is possible to suppress temperature increases in the motor 32 and the inverter 34.

[0032] FIG. 5 is an explanatory diagram showing an example of a state when a temperature increase request for the battery 36 is made during external charging. FIG. 5 shows the required charging current Ireq, power storage rate SOC, temperature αb, coolant temperature αw of the cooling device 40, and duty D of the battery 36. As shown in the figure, when external charging starts (from time t1), the required charging current Ireq is set to a relatively small value based on the input limit Win of the battery 36 and the power storage rate SOC. Furthermore, by operating the cooling device 40 and executing temperature increase d-axis control, increases in the coolant temperature αw and the temperature αb of the battery 36 are promoted. In the temperature increase d-axis control, since the coolant temperature αw is less than the threshold αwref, setting the duty D to a predetermined value D2 smaller than the predetermined value D1 can prevent excessive temperature increases in the motor 32 and the inverter 34 in a first environment where the viscosity of the coolant is relatively high and the coolant does not circulate easily through the circulation flow path 42, making it difficult to increase the temperature of the battery 36 and where the temperature increases of the motor 32 and the inverter 34 are likely to be large. Thereafter, when the temperature αb of the battery 36 becomes higher than the threshold value αbref to some extent (time t2), and the absolute value of the input limit Win accordingly becomes higher to some extent, the charging request current Ireq is increased sufficiently. Furthermore, when the coolant temperature αw reaches or exceeds the threshold value αwref (time t3), the duty D is switched from the predetermined value D2 to the predetermined value D1. As a result, the amount of heat generated by the motor 32 and the inverter 34 increases, and the rate of increase per unit time of the coolant temperature αw and the temperature αb of the battery 36 increases, compared to when the coolant temperature αw is below the threshold value αwref. Thereafter, when the power storage percentage SOC of the battery 36 increases to some extent (time t4), the charging request current Ireq is reduced. Furthermore, when the temperature αb of the battery 36 becomes higher than the threshold value αbref2 during external charging (time t5), the duty D is switched from the predetermined value D1 to the predetermined value D3. This makes it possible to suppress the temperature increase of the motor 32 and the inverter 34 in the second environment in which the temperature increase of the battery 36 may be gradual. When the power storage ratio SOC of the battery 36 reaches a predetermined ratio Sfl (time t6), external charging is terminated. Note that the order of the timing at which the charging request current Ireq is made sufficiently large (time t2) and the timing at which the duty D is switched from the predetermined value D2 to the predetermined value D1 (time t3) may be reversed.Furthermore, the timing when the charging request current Ireq starts to be reduced (time t4) and the timing when the temperature αb of the battery 36 reaches or exceeds the threshold value αbref2 (time t5) may be reversed.

[0033] In the drive system mounted on the electric vehicle 20 of the embodiment described above, when the cooling device 40 is operated and heating d-axis control is executed in response to a request to heat the battery 36 during external charging, if the coolant temperature αw of the cooling device 40 is below the threshold value αwref, the inverter 34 is controlled to reduce the d-axis current Id flowing through the motor 32 compared to when the coolant temperature αw is equal to or higher than the threshold value αwref. This makes it possible to prevent excessive temperature rises in the motor 32 and the inverter 34 in the first environment in which the viscosity of the coolant is relatively high and the coolant does not circulate easily through the circulation flow path 42, making it difficult for the temperature of the battery 36 to rise and causing large temperature rises in the motor 32 and the inverter 34.

[0034] Furthermore, in the drive device mounted on the electric vehicle 20 of the embodiment, when the cooling device 40 is activated and temperature increase d-axis control is executed in response to a request to increase the temperature of the battery 36 during external charging, if the temperature αb of the battery 36 is equal to or higher than the threshold value αbref2, the duty D is reduced compared to when the temperature αb of the battery 36 is below the threshold value αbref. This makes it possible to suppress temperature increases in the motor 32 and the inverter 34 in the second environment in which the temperature increase of the battery 36 may be gradual.

[0035] In the above-described embodiment, when performing temperature rise d-axis control during external charging, when the temperature αb of the battery 36 is equal to or higher than the threshold value αbref2, the duty D is made smaller than when the temperature αb of the battery 36 is lower than the threshold value αbref. However, the duty D may be made the same regardless of whether the temperature αb of the battery 36 is equal to or higher than the threshold value αbref2.

[0036] In the above-described embodiment, when a request to increase the temperature of the battery 36 is made during external charging, the cooling device 40 is operated and the temperature increase d-axis control is executed. However, this is not limited to this. For example, the temperature increase d-axis control may be executed when a request to increase the temperature of the battery 36 is made between the time when the vehicle connector 39 and the stand connector 84 are connected while the vehicle is parked at a charging point and before the charging start condition is met. Furthermore, the temperature increase d-axis control may be executed when a request to increase the temperature of the battery 36 is made between the time when the power switch 60 is turned on to start the system and the time when driving begins.

[0037] In the above-described embodiment, the battery 36 is used as the power storage device, but this is not limiting. For example, a capacitor or the like may be used as the power storage device.

[0038] In the above-described embodiment, the drive unit is described as being mounted on an electric vehicle 20 that includes a motor 32, an inverter 34, and a battery 36, but is not limited to this. For example, the drive unit may be mounted on a hybrid vehicle that further includes an engine in addition to the same hardware configuration as the electric vehicle 20, or may be mounted on a fuel cell vehicle that further includes a fuel cell in addition to the same hardware configuration as the electric vehicle 20.

[0039] The correspondence between the main elements of the embodiment and the main elements of the invention described in the "Means for Solving the Problem" section will be described below. In the embodiment, the motor 32 corresponds to the "motor," the inverter 34 corresponds to the "inverter," the battery 36 corresponds to the "electricity storage device," the cooling device 40 corresponds to the "cooling device," and the vehicle ECU 50 corresponds to the "control device."

[0040] The correspondence between the main elements of the embodiments and the main elements of the invention described in the "Means for Solving the Problem" section does not limit the elements of the invention described in the "Means for Solving the Problem" section, since the embodiments are examples for specifically explaining the mode for implementing the invention described in the "Means for Solving the Problem" section. In other words, the interpretation of the invention described in the "Means for Solving the Problem" section should be based on the description in that section, and the embodiments are merely specific examples of the invention described in the "Means for Solving the Problem" section.

[0041] The above describes the forms for implementing the present disclosure using embodiments, but the present disclosure is not limited to these embodiments in any way, and it goes without saying that the present disclosure can be implemented in various forms within the scope that does not deviate from the gist of the present disclosure. [Industrial Applicability]

[0042] The present disclosure is applicable to industries such as the drive device manufacturing industry. [Explanation of symbols]

[0043] 20 electric vehicle, 22a, 22b drive wheels, 24 differential gear, 26 drive shaft, 32 motor, 32a rotational position sensor, 32t, 34t, 36t temperature sensors, 32u, 32v, 32w, 36i current sensor, 34 inverter, 36 battery, 36v, 38v voltage sensor, 37 power line, 38 capacitor, 39 vehicle connector, 40 cooling device, 42 circulation flow path, 44 radiator, 46 electric pump, 48 temperature sensor, 50 vehicle ECU, 60 power switch, 61 shift lever, 62 shift sensor, 63 accelerator pedal, 64 accelerator pedal position sensor, 65 brake pedal, 66 brake pedal position sensor, 67 vehicle speed sensor, 80 charging stand, 82 power supply device, 84 stand connector, 86 power line, 88 stand ECU.

Claims

1. A drive device including a motor, an inverter that drives the motor, a power storage device connected to the inverter via a power line, a cooling device that circulates cooling water through a circulation flow path that includes the motor, the inverter, and the power storage device, and a control device that controls the inverter and the cooling device, When the control device executes temperature-rise d-axis control in which, in response to a temperature rise request for the power storage device, the cooling device is operated and the inverter is controlled so that only a d-axis current flows through the motor, when the temperature of the coolant is less than a first temperature threshold, the control device controls the inverter so that the d-axis current flowing through the motor is smaller than when the temperature of the coolant is equal to or higher than the first temperature threshold. Drive unit.

2. 2. The drive device according to claim 1, When the control device performs the temperature increase d-axis control together with the operation of the cooling device, if the temperature of the coolant is lower than the first temperature threshold or if the temperature of the power storage device is equal to or higher than a second temperature threshold that is higher than the first temperature threshold, the control device controls the inverter so that the d-axis current flowing to the motor is smaller than when the temperature of the coolant is equal to or higher than the first temperature threshold and the temperature of the power storage device is lower than the second temperature threshold. Drive unit.

3. 3. The drive device according to claim 1 or 2, When executing the heating d-axis control, the control device sets a duty to be smaller when the temperature of the cooling water is less than a first temperature threshold value compared to when the temperature of the cooling water is equal to or greater than the first temperature threshold value, sets a product of the duty and a reference current value to a d-axis current command, sets a value of 0 to a q-axis current command, and controls the inverter so that differences between the d-axis current and the q-axis current and the d-axis current command and the q-axis current command are canceled out. Drive unit.

4. 3. The drive device according to claim 1 or 2, the drive device is capable of external charging to charge the power storage device using electric power from an external power supply, the control device executes the temperature increase d-axis control together with the operation of the cooling device when the external charging is performed and a temperature increase request for the power storage device is made. Drive unit.

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