Control device for rotary electric machine, program, and control method for rotary electric machine

Abstract

To provide a control device for a rotary electric machine capable of preventing an unintended current from flowing through a system when the rotary electric machine is restarted.SOLUTION: A control device 60 is applied to a control system 100 that includes a rotary electric machine 40, a first inverter 20, a second inverter 30, a positive electrode side busbar 11, a negative electrode side busbar 12, and a positive electrode side switch QH. The control device 60 includes: a determining unit that determines whether the rotary electric machine 40 is in a stop mode in which driving is stopped in a state in which the positive electrode side switch QH is turned off; and a current supply unit for supplying current from a battery 10 to a second capacitor 15b by performing switching control of the first inverter 20 provided that it is determined that the device is in the stop mode.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a control device for a rotating electrical machine, a program, and a method for controlling a rotating electrical machine.

Background Art

[0002] Conventionally, a system for controlling a rotating electrical machine by two inverters has been known. In this system, a first inverter is electrically connected to a first end of a plurality of phase windings of the rotating electrical machine, and a second inverter is electrically connected to a second end. A DC power supply is electrically connected in parallel to the first inverter. A capacitor is electrically connected in parallel to the second inverter. As an example of such a technique, the technique disclosed in Patent Document 1 can be cited.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] After the drive of the rotating electrical machine is temporarily stopped, a situation may occur where the drive of the rotating electrical machine is restarted. In this case, due to a difference between the voltage of the capacitor that has decreased during the drive stop of the rotating electrical machine and the voltage applied to the capacitor with the restart of the drive of the rotating electrical machine, there is a concern that an unintended current may flow through the system.

[0005] An object of the present disclosure is to provide a control device for a rotating electrical machine, a program, and a method for controlling a rotating electrical machine that can suppress the flow of an unintended current through the system when the drive of the rotating electrical machine is restarted.

Means for Solving the Problems

[0006] The present disclosure is A rotating electrical machine having windings of multiple phases, A first inverter having as many pairs of a first upper arm switch and a first lower arm switch connected in series as the number of phases, and the series connection of the first upper arm switch and the first lower arm switch being electrically connected in parallel to a DC power supply; A second inverter having as many pairs of a second upper arm switch and a second lower arm switch connected in series as the number of phases, and the series connection of the second upper arm switch and the second lower arm switch being electrically connected in parallel to a capacitor and a resistor section; A positive bus bar that electrically connects the high-potential side terminals of the first upper arm switch and the second upper arm switch in each phase; A negative bus bar that electrically connects the low-potential side terminals of the first lower arm switch and the second lower arm switch in each phase; A switching switch provided on at least one of the positive bus bar and the negative bus bar; A control device for a rotating electrical machine applied to a system including: In each phase, the low-potential side terminal of the first upper arm switch and the high-potential side terminal of the first lower arm switch are electrically connected to the first end of the winding; In each phase, the low-potential side terminal of the second upper arm switch and the high-potential side terminal of the second lower arm switch are electrically connected to the second end of the winding; A rest determination unit that determines whether or not it is in a rest mode in which the rotating electrical machine is driven to a stop while the switching switch is off; A current supply unit that supplies a current from the DC power supply to the capacitor via the winding and the second inverter by performing switching control of at least one of the first upper arm switch and the first lower arm switch on the condition that it is determined that it is in the rest mode; Comprising.

[0007] During the standby mode in which the changeover switch is turned off, the voltage of the capacitor may decrease. In this case, there is a concern that an unintended current may flow through the system due to a difference between the voltage of the capacitor that has decreased during the drive stop of the rotating electrical machine and the voltage applied to the capacitor when the drive of the rotating electrical machine is restarted.

[0008] Therefore, in the present disclosure, when it is determined that the standby mode is in progress, at least one of the first upper arm switch and the first lower arm switch is subjected to switching control, so that current is supplied from the DC power supply to the capacitor via the winding and the second inverter. As a result, the capacitor is charged during the standby mode, and a decrease in the voltage of the capacitor is suppressed. Therefore, it is possible to suppress a difference between the voltage of the capacitor during the standby mode and the voltage applied to the capacitor when the drive of the rotating electrical machine is restarted. As a result, it is possible to suppress an unintended current from flowing through the system when the drive of the rotating electrical machine is restarted.

Brief Description of the Drawings

[0009]

Figure 1

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Embodiments for Carrying Out the Invention

[0010] A plurality of embodiments will be described with reference to the drawings. In the plurality of embodiments, parts that functionally and / or structurally correspond and / or are associated may be assigned the same reference numerals, or reference numerals that differ in the hundreds place or more. For corresponding parts and / or associated parts, reference may be made to the description of other embodiments.

[0011] <First Embodiment> Hereinafter, a first embodiment in which the control device according to the present disclosure is embodied will be described with reference to the drawings. The control device of this embodiment is mounted on an electric vehicle such as an electric car or a hybrid car and is applied to an in-vehicle control system.

[0012] As shown in FIG. 1, the control system 100 includes a battery 10 (corresponding to a "DC power source"), a first inverter 20, a second inverter 30, and a rotating electric machine 40. The battery 10 is, for example, a battery pack including a series connection of unit batteries. The unit battery is a single battery cell or a series connection of a plurality of battery cells. The battery cell is, for example, a secondary battery such as a lithium-ion battery.

[0013] The first inverter 20 and the second inverter 30 are power conversion circuits that convert DC power supplied from the battery 10 into three-phase AC power and supply it to the rotating electric machine 40.

[0014] The first inverter 20 includes a series connection of U, V, W phase first upper arm switches SUHa, SVHa, SWHa and U, V, W phase first lower arm switches SULa, SVLa, SWLa. The second inverter 30 includes a series connection of U, V, W phase second upper arm switches SUHb, SVHb, SWHb and U, V, W phase second lower arm switches SULb, SVLb, SWLb.

[0015] In this embodiment, voltage-controlled semiconductor switching elements are used as the switches SUHa to SWLa and SUHb to SWLb, and more specifically, IGBTs are used. In this case, the high-potential side terminals of the switches SUHa to SWLa and SUHb to SWLb are collectors, and the low-potential side terminals are emitters. Freewheel diodes DUHa, DVHa, DWHa, DULa, DVLa, DWLa, DUHb, DVHb, DWHb, DULb, DVLb, DWLb are connected in antiparallel to the switches SUHa, SVHa, SWHa, SULa, SVLa, SWLa, SUHb, SVHb, SWHb, SULb, SVLb, SWLb.

[0016] The collectors of the U, V, W phase first upper arm switches SUHa, SVHa, SWHa and the collectors of the U, V, W phase second upper arm switches SUHb, SVHb, SWHb are electrically connected by a positive electrode side bus bar 11 such as a bus bar. Also, the emitters of the U, V, W phase first lower arm switches SULa, SVLa, SWLa and the emitters of the U, V, W phase second lower arm switches SULb, SVLb, SWLb are electrically connected by a negative electrode side bus bar 12 such as a bus bar.

[0017] The positive terminal of the battery 10 is electrically connected to the positive-side bus bar 11 on the side opposite to the connection points with the second upper arm switches SUHb, SVHb, and SWHb with respect to the connection points with the first upper arm switches SUHa, SVHa, and SWHa in each phase. The negative terminal of the battery 10 is electrically connected to the negative-side bus bar 12 on the side opposite to the connection points with the second lower arm switches SULb, SVLb, and SWLb with respect to the connection points with the first lower arm switches SULa, SVLa, and SWLa in each phase.

[0018] The rotating electrical machine 40 is an in-vehicle main machine. The rotor 41 of the rotating electrical machine 40 is capable of power transmission with the drive wheels 43 of the vehicle. In the present embodiment, the rotating electrical machine 40 is a permanent magnet field-excited synchronous machine. The rotor 41 includes permanent magnets 42 (for example, neodymium magnets) as field poles.

[0019] The rotating electrical machine 40 includes a stator 50. The stator 50 includes a U-phase winding 51U, a V-phase winding 51V, and a W-phase winding 51W as armature windings. The phase windings 51U, 51V, and 51W are arranged with a 120° electrical angle shift from each other. The phase windings 51U, 51V, and 51W are open-connected, and both ends of the phase windings 51U, 51V, and 51W are electrically connected to the first inverter 20 or the second inverter 30.

[0020] Specifically, in each phase, the emitters of the first upper arm switches SUHa, SVHa, and SWHa and the collectors of the first lower arm switches SULa, SVLa, and SWLa are electrically connected to the first ends 51Ua, 51Va, and 51Wa of the windings 51U, 51V, and 51W. Also, in each phase, the emitters of the second upper arm switches SUHb, SVHb, and SWHb and the collectors of the second lower arm switches SULb, SVLb, and SWLb are electrically connected to the second ends 51Ub, 51Vb, and 51Wb of the windings 51U, 51V, and 51W.

[0021] The control system 100 includes a positive - side switching switch QH. The positive - side switching switch QH is provided between the first inverter 20 and the second inverter 30 in the positive - side bus 11. Specifically, the positive - side switching switch QH is provided between the connection points of the positive - side bus 11 with the first upper - arm switches SUHa, SVHa, SWHa of each phase and the connection points of the positive - side bus 11 with the second upper - arm switches SUHb, SVHb, SWHb of each phase. When the positive - side switching switch QH is turned on, it electrically conducts between the first inverter 20 and the second inverter 30 in the positive - side bus 11, and when it is turned off, it electrically cuts off the connection between the first inverter 20 and the second inverter 30 in the positive - side bus 11. In this embodiment, the positive - side switching switch QH is controlled by a control device 60 included in the control system 100. The positive - side switching switch QH is provided to switch the driving state of the control system 100, as will be described later.

[0022] For example, the positive - side switching switch QH is a semiconductor switching element such as an IGBT or a relay. When an IGBT is used as the positive - side switching switch QH, a free - wheel diode is connected in parallel to the positive - side switching switch QH. In this case, for the free - wheel diode connected in parallel to the positive - side switching switch QH, the anode is electrically connected to the second - inverter 30 side, and the cathode is electrically connected to the first - inverter 20 side.

[0023] The control system 100 includes a first capacitor 15a and a second capacitor 15b. The first terminal of the first capacitor 15a is electrically connected between the connection points of the positive - side bus 11 with the first upper - arm switches SUHa, SVHa, SWHa of each phase and the positive - terminal of the battery 10. The second terminal of the first capacitor 15a is electrically connected between the connection points of the negative - side bus 12 with the first lower - arm switches SULa, SVLa, SWLa of each phase and the negative - terminal of the battery 10. That is, the first capacitor 15a is electrically connected in parallel to the series connection of the first upper - arm switches SUHa, SVHa, SWHa of each phase and the first lower - arm switches SULa, SVLa, SWLa of each phase.

[0024] The first terminal of the second capacitor 15b is electrically connected to the positive bus bar 11 on the side opposite to the connection point with the first upper arm switches SUHa, SVHa, and SWHa of each phase with respect to the connection point with the second upper arm switches SUHb, SVHb, and SWHb of each phase. The second terminal of the second capacitor 15b is electrically connected to the negative bus bar 12 on the side opposite to the connection point with the first lower arm switches SULa, SVLa, and SWLa of each phase with respect to the connection point with the second lower arm switches SULb, SVLb, and SWLb of each phase. That is, the second capacitor 15b is electrically connected in parallel to the series connection of the second upper arm switches SUHb, SVHb, and SWHb of each phase and the second lower arm switches SULb, SVLb, and SWLb of each phase.

[0025] For example, the first capacitor 15a is an electrolytic capacitor. Also, for example, the second capacitor 15b is an electric double layer capacitor. Note that it is also possible to employ a capacitor of a type different from the electrolytic capacitor as the first capacitor 15a (for example, an electric double layer capacitor), or to employ a capacitor of a type different from the electric double layer capacitor as the second capacitor 15b (for example, an electrolytic capacitor).

[0026] The control system 100 includes a positive power supply switch MH and a negative power supply switch ML. The positive power supply switch MH is provided between the connection point with the first terminal of the first capacitor 15a and the battery 10 among the positive bus bar 11. The negative power supply switch ML is provided between the connection point with the second terminal of the first capacitor 15a and the battery 10 among the negative bus bar 12. For example, each of the power supply switches MH and ML is a relay or a semiconductor switching element. Each of the power supply switches MH and ML is controlled by the control device 60.

[0027] The control system 100 includes a first resistor 16a and a second resistor 16b (corresponding to the "resistive part"). In this embodiment, each of the resistors 16a and 16b is a discharge resistor that enables each of the capacitors 15a and 15b to discharge when each of the power switches MH and ML is turned off.

[0028] The first resistor 16a is electrically connected in parallel to the first capacitor 15a. Specifically, the first end of the first resistor 16a is electrically connected between the connection point of the first end of the first capacitor 15a and the positive electrode side bus 11 and the positive electrode side power switch MH. The second end of the first resistor 16a is electrically connected between the connection point of the second end of the first capacitor 15a and the negative electrode side bus 12 and the negative electrode side power switch ML.

[0029] Also, the second resistor 16b is electrically connected in parallel to the second capacitor 15b. Specifically, the first end of the second resistor 16b is electrically connected between the connection point of the first phase second upper arm switches SUHb, SVHb, SWHb and the positive electrode side bus 11 and the first end of the second capacitor 15b. The second end of the second resistor 16b is electrically connected between the connection point of the second phase second lower arm switches SULb, SVLb, SWLb and the negative electrode side bus 12 and the second end of the second capacitor 15b.

[0030] The control system 100 includes a first voltage sensor 61, a second voltage sensor 62, a current sensor 63, a rotation angle sensor 64, an accelerator sensor 65, and a shift position sensor 66. The first voltage sensor 61 detects the voltage of the first capacitor 15a. The second voltage sensor 62 detects the voltage of the second capacitor 15b. The current sensor 63 detects the phase currents flowing through the phase windings 51U, 51V, and 51W. In this embodiment, the current sensor 63 is provided on the side of the first inverter 20 among both ends of each of the phase windings 51U, 51V, and 51W. Note that the current sensor 63 may be provided on the side of the second inverter 30 among both ends of each of the phase windings 51U, 51V, and 51W. The rotation angle sensor 64 is, for example, a resolver and detects the electrical angle of the rotor 41. The accelerator sensor 65 detects the accelerator operation amount Ac of a user (for example, a driver). Detection values of the respective sensors 61 to 65 are input to the control device 60.

[0031] The shift position sensor 66 detects a shift position that is the position of a shift lever of a transmission (not shown). For example, the shift lever of the transmission is operated by a user. For example, the shift position includes a parking range (P range) used when the vehicle is parked, a reverse range (R range) for instructing the vehicle to reverse, a neutral range (N range) in which power transmission between the rotor 41 and the drive wheels 43 is interrupted, and a drive range (D range) for instructing the vehicle to move forward. A signal SH for notifying the shift position is input to the control device 60.

[0032] The control device 60 is an electronic control unit (ECU: Electronic Control Unit) that performs various controls of the control system 100, and includes a processor 60a and a storage unit 60b as hardware. In the control system 100, each in-vehicle device can be controlled by an ECU corresponding to each in-vehicle device. However, in FIG. 1, for convenience, a plurality of ECUs are shown as one control device 60.

[0033] The storage unit 60b includes a memory and a storage as hardware. The memory is a storage device for storing data used in the processing of the control device 60. The memory provides, for example, a working area for temporary use by the processor 60a when the processor 60a performs processing. The memory includes, for example, a ROM or a RAM. The storage is a storage device for storing various programs and data to be read and executed by the processor 60a, and is a non-transitory tangible storage medium. The storage includes, for example, an HDD or a flash memory. Program information and the like for the processing of FIGS. 2, 5, 12, etc. to be described later are stored in the storage.

[0034] For example, program information stored in a non-transitory tangible recording medium is installed in the storage unit 60b. The recording medium is, for example, a USB memory, a CD-ROM, or a DVD. Also, for example, program information transmitted via a communication network such as OTA (Over The Air) is installed in the storage unit 60b.

[0035] In order to control the control amount of the rotary electric machine 40 to a command value, the control device 60 controls the on or off of the positive electrode side switching switch QH, each switch SUHa to SWLa of the first inverter 20, and each switch SUHb to SWLb of the second inverter 30 with each power switch MH, ML turned on. In the present embodiment, the control amount is torque.

[0036] Hereinafter, with reference to FIG. 2, the torque control of the rotary electric machine 40 executed by the control device 60 will be described. The control device 60 includes a current command generation unit 80, a dq conversion unit 81, d-axis and q-axis deviation calculation units 82d and 82q, a current control unit 83, a UVW conversion unit 84, a speed calculation unit 85, a selection unit 86, and a modulation unit 87.

[0037] Based on the torque command value Trq* received from a control device higher than the control device 60, the current command generation unit 80 calculates the d-axis current command value Id* and the q-axis current command value Iq* in the dq coordinate system. The current command generation unit 80 inputs the calculated d-axis current command value Id* to the d-axis deviation calculation unit 82d. The current command generation unit 80 inputs the calculated q-axis current command value Iq* to the q-axis deviation calculation unit 82q.

[0038] Based on the phase currents Iur, Ivr, Iwr detected by the current sensor 63 and the electrical angle θr detected by the rotation angle sensor 64, the dq conversion unit 81 calculates the d-axis current value Idr and the q-axis current value Iqr. The dq conversion unit 81 inputs the calculated d-axis current value Idr to the d-axis deviation calculation unit 82d. The dq conversion unit 81 inputs the calculated q-axis current value Iqr to the q-axis deviation calculation unit 82q.

[0039] The d-axis deviation calculation unit 82d calculates the d-axis current deviation, which is the difference between the input d-axis current command value Id* and the d-axis current value Idr. The q-axis deviation calculation unit 82q calculates the q-axis current deviation, which is the difference between the input q-axis current command value Iq* and the q-axis current value Iqr. Each deviation calculation unit 82d, 82q inputs the calculated d-axis and q-axis current deviations to the current control unit 83.

[0040] The current control unit 83 calculates the d-axis voltage command value Vd* as an operation amount for feedback control to make the input d-axis current deviation zero. The current control unit 83 calculates the q-axis voltage command value Vq* as an operation amount for feedback control to make the input q-axis current deviation zero. The current control unit 83 inputs the calculated d-axis and q-axis voltage command values Vd*, Vq* to the UVW conversion unit 84.

[0041] The UVW conversion unit 84 calculates the U, V, and W phase voltage command values Vu*, Vv*, and Vw* based on the input d-axis and q-axis voltage command values Vd*, Vq* and the electrical angle θr. Each phase voltage command value Vu*, Vv*, and Vw* is a command value for the applied voltage of the U, V, and W phase windings 51U, 51V, and 51W. The U, V, and W phase voltage command values Vu*, Vv*, and Vw* are phase-shifted by 120° from each other in terms of the electrical angle. In the present embodiment, the sign of the applied voltage of each phase winding is positive when the potential of the first end 51Ua, 51Va, 51Wa is higher than that of the second end 51Ub, 51Vb, 51Wb of the windings 51U, 51V, 51W, and negative when the potential of the second end 51Ub, 51Vb, 51Wb is higher than that of the first end 51Ua, 51Va, 51Wa of the windings 51U, 51V, 51W. The UVW conversion unit 84 inputs the calculated U, V, and W phase voltage command values Vu*, Vv*, and Vw* to the modulation unit 87.

[0042] The speed calculation unit 85 calculates the rotational speed Nr of the rotor 41 based on the electrical angle θr. The speed calculation unit 85 inputs the calculated rotational speed Nr to the selection unit 86.

[0043] The selection unit 86 determines whether the control system 100 should be in either Y drive control or H drive control. In the present embodiment, the selection unit 86 selects whether to perform either Y drive control or H drive control based on the operating point of the rotating electrical machine 40 determined by the input rotational speed Nr and torque command value Trq* and the control map information. The control map information is information in which the Y drive control region and the H drive control region are defined in association with the rotational speed Nr and the torque command value Trq*. The control map information is stored in the storage unit 60b.

[0044] The modulation unit 87 generates a carrier signal for generating drive signals for each of the switches SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30. For example, the carrier signal is a triangular wave signal. The drive signal consists of an on command and an off command for the switch.

[0045] The modulation unit 87 generates drive signals for the switches SUHa to SWLa and SUHb to SWLb of the first and second inverters 20 and 30 based on the input phase voltage command values Vu*, Vv*, Vw*, the first detected voltage V1r which is the voltage detected by the first voltage sensor 61, and the generated carrier signal.

[0046] Specifically, the modulation unit 87 calculates U, V, W phase normalized command values Dutyu, Dutyv, Dutyw by normalizing the U, V, W phase voltage command values Vu*, Vv*, Vw* with the first detected voltage V1r. Specifically, the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw are values obtained by dividing the U, V, W phase voltage command values Vu*, Vv*, Vw* by 1 / 2 of the first detected voltage V1r.

[0047] When H drive control is selected by the selection unit 86, as shown in FIG. 3, the modulation unit 87, as H drive control, turns on the positive electrode side switching switch QH, PWM drives each switch SUHa to SWLa of the first inverter 20, and performs control to PWM drive each switch SUHb to SWLb of the second inverter 30. The modulation unit 87 generates drive signals for the switches SUHa to SWLa and SUHb to SWLb of the first and second inverters 20 and 30 based on the comparison of the magnitudes between the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw and the carrier signal.

[0048] On the other hand, when Y drive control is selected by the selection unit 86, as Y drive control, as shown in FIG. 4, the modulation unit 87 turns off the positive electrode side switching switch QH and performs control to PWM drive each switch SUHa to SWLa of the first inverter 20. Also, each phase second upper arm switch SUHb, SVHb, SWHb is fixed on, and each phase second lower arm switch SULb, SVLb, SWLb is fixed off. Thereby, each phase winding 51U, 51V, 51W is star-connected via the second inverter 30. The modulation unit 87 generates drive signals for the switches SUHa to SWLa of the first inverter 20 based on the comparison of the magnitudes between the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw and the carrier signal.

[0049] Based on the generated drive signal, the modulation unit 87 controls the charging and discharging currents of the gates of the switches SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30. Thereby, according to the drive signal, the on or off of each of the switches SUHa to SWLa and SUHb to SWLb in the first and second inverters 20 and 30 is controlled.

[0050] In the H drive control, the switching patterns of the switches SUHa to SWLa and SUHb to SWLb that are switched according to the drive signal are shifted in phase by 120° in electrical angle in each phase. Also, in the Y drive control, the switching patterns of the switches SUHa to SWLa in the first inverter 20 that are switched according to the drive signal are shifted in phase by 120° in electrical angle in each phase.

[0051] Fig. 5 shows a flowchart of the control executed by the control device 60. The process shown in Fig. 5 is repeatedly executed by the processor 60a of the control device 60, for example, at a predetermined control cycle.

[0052] In step S10, the selection unit 86 acquires the torque command value Trq* and the rotational speed Nr calculated by the speed calculation unit 85.

[0053] In step S11, the selection unit 86 selects either Y drive control or H drive control based on the torque command value Trq* and the rotational speed Nr.

[0054] If Y drive control is selected in step S11, the process proceeds to step S13, and the modulation unit 87 executes the Y drive control shown in Fig. 4 above. On the other hand, if the H drive state is selected in step S11, the process proceeds to step S14, and the modulation unit 87 executes the H drive control shown in Fig. 3 above.

[0055] Incidentally, after the drive of the rotating electrical machine 40 is temporarily stopped, a situation may occur where the drive of the rotating electrical machine 40 is restarted. In this case, due to a difference between the voltage VC2 of the second capacitor 15b that has decreased during the drive stop of the rotating electrical machine 40 and the voltage applied to the second capacitor 15b as the drive of the rotating electrical machine 40 is restarted, there is concern that an unintended current may flow through the control system 100.

[0056] Here, as shown in FIG. 6, a comparative example is described assuming a situation where the Y drive control is temporarily stopped at time t1 and the implementation of the Y drive control is restarted at time t2. In FIG. 6, (a) shows the transition of the U, V, W phase normalized command values Dutyu, Dutyv, Dutyw, (b) shows the transition of the V7 ratio described later, (c) shows the transition of the voltage VC2 of the second capacitor 15b, and (d) shows the transition of the current IC2 flowing through the second capacitor 15b.

[0057] During the implementation of the Y drive control, the control device 60 performs switching control of the first inverter 20 based on the respective phase normalized command values Dutyu, Dutyv, Dutyw. In this case, the first inverter 20 can output the 0th, 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th output voltages V0, V1, V2, V3, V4, V5, V6, V7 in the switching control. The 0th output voltage V0 is the voltage output during a period in which the first lower arm switches SULa, SVLa, SWLa of each phase are turned on and the first upper arm switches SUHa, SVHa, SWHa of each phase are turned off. The 7th output voltage V7 is the voltage output during a period in which the first upper arm switches SUHa, SVHa, SWHa of each phase are turned on and the first lower arm switches SULa, SVLa, SWLa of each phase are turned off.

[0058] Note that Fig. 7 shows the switches that are turned on during the output periods of the 0th to 7th output voltages V0 to V7. In each phase, the switches of the opposite arm to the switches shown in Fig. 7 are turned off. Each of the output voltages V0 to V7 is also a space vector representing the voltage applied to the U, V, and W phase windings 51U, 51V, and 51W by a vector, and is also referred to as an output voltage vector.

[0059] The modulation unit 87 generates a drive signal for outputting the 7th output voltage V7 during the period when each phase normalized command value Dutyu, Dutyv, Dutyw exceeds the carrier signal. Therefore, the higher each phase normalized command value Dutyu, Dutyv, Dutyw is, the longer the output period of the 7th output voltage V7 in one switching cycle of the switching control becomes.

[0060] The modulation unit 87 generates a drive signal for outputting the 0th output voltage V0 during the period when each phase normalized command value Dutyu, Dutyv, Dutyw is below the carrier signal. Therefore, the lower each phase normalized command value Dutyu, Dutyv, Dutyw is, the longer the output period of the 0th output voltage V0 in one switching cycle of the switching control becomes.

[0061] When the positive-side switching switch QH is turned off, the higher the V7 ratio, which correlates with the length of the output period of the 7th output voltage V7 in the switching control, the higher the voltage VC2 of the second capacitor 15b becomes. Specifically, the V7 ratio is the ratio of the output period of the 7th output voltage V7 to the total of the output periods of the 0th and 7th output voltages V7 in one switching cycle. Fig. 6 illustrates the transition of the voltage VC2 in the second capacitor 15b when the V7 ratio is near 50%.

[0062] When the control device 60 temporarily stops the Y drive control, it turns off the positive electrode side changeover switch QH and each of the switches SUHa to SWLa and SUHb to SWLb. In this case, as shown in FIG. 8, a current flows through the closed circuit including the second capacitor 15b and the second resistor 16b, and the second capacitor 15b is discharged. As a result, the voltage of the second capacitor 15b decreases while the Y drive control is stopped. In FIG. 6, the voltage VC2 of the second capacitor 15b decreases from the average value VC2a of the voltage applied when the V7 ratio is near 50% to a value VC2b lower than the average value VC2a. Here, assuming that the voltage value of the battery 10 is VB (corresponding to the "power supply voltage value"), the average value VC2a is VB / 2.

[0063] Note that when the control device 60 temporarily stops the H drive control, in addition to turning off each of the switches SUHa to SWLa and SUHb to SWLb, the positive electrode side changeover switch QH may be turned off. In this case, similarly to the case where the Y drive control is stopped, a current flows through the closed circuit including the second capacitor 15b and the second resistor 16b, and the second capacitor 15b is discharged.

[0064] When the control device 60 resumes the implementation of the Y drive control, for example, it performs switching control at the same V7 ratio as before the stop of the Y drive control. In this case, a voltage similar to that before the stop of the Y drive control can be applied to the second capacitor 15b. At that time, as shown in FIG. 6, due to the steep increase in the value of the voltage VC2 of the second capacitor 15b from VC2b to VC2a, there is a concern that an inrush current will flow through the second capacitor 15b. In this case, for example, there is a concern that an overcurrent will flow through the components constituting the control system 100 such as each of the switches SUHa to SWLa, SUHb to SWLb, QH and each of the capacitors 15a and 15b. Also, for example, there is a concern that an unintended torque will be generated on the drive wheels 43 due to an unintended current flowing through each of the phase windings 51U, 51V, and 51W.

[0065] Therefore, in this embodiment, the control device 60 performs a current supply process of supplying current from the battery 10 to the second capacitor 15b while the rotating electrical machine 40 is stopped. Hereinafter, the configuration for implementing the current supply process will be described.

[0066] Returning to the description of FIG. 2, the control device 60 includes a determination unit 90 and a voltage adjustment unit 91. The determination unit 90 determines whether or not the rotating electrical machine 40 is in a rest mode in which the positive electrode side switching switch QH is turned off. In other words, the determination unit 90 determines that it is in the rest mode when it determines that the positive electrode side switching switch QH is turned off and the rotating electrical machine 40 is stopped. The determination unit 90 determines that it is in the operation mode when it determines that the positive electrode side switching switch QH is turned on or when it determines that the rotating electrical machine 40 is in operation, in at least one of these cases.

[0067] For example, when Y drive control is selected by the selection unit 86, the determination unit 90 determines that the positive electrode side switching switch QH is turned off. Also, for example, when H drive control is selected by the selection unit 86, the determination unit 90 determines that the positive electrode side switching switch QH is turned on.

[0068] For example, when the determination unit 90 determines that the accelerator operation amount Ac detected by the accelerator sensor 65 is equal to or less than an operation amount determination value near 0, it determines that the rotating electrical machine 40 is stopped, and when it determines that the accelerator operation amount Ac is higher than the operation amount determination value, it determines that the rotating electrical machine 40 is in operation. Also, for example, when the determination unit 90 determines that the torque command value Trq* is equal to or less than a torque determination value near 0, it determines that the rotating electrical machine 40 is stopped, and when it determines that the torque command value Trq* is higher than the torque determination value, it determines that the rotating electrical machine 40 is in operation.

[0069] Note that the determination unit 90 may determine that the vehicle is in the rest mode on the condition that both of the determination conditions that the accelerator operation amount Ac is less than or equal to the operation amount determination value and that the torque command value Trq* is less than or equal to the torque determination value are satisfied in a state where the positive electrode side switching switch QH is turned off. The determination condition for the vehicle being in the rest mode described above may be satisfied not only when the vehicle is stopped but also when the vehicle is traveling at a low speed.

[0070] The determination unit 90 inputs the notification signal Sg to the voltage adjustment unit 91. The notification signal Sg is a signal for notifying whether to perform the current supply process. The notification signal Sg is a binary signal, and notifies that the current supply process is to be performed by logic H and notifies that the current supply process is not to be performed by logic L. The determination unit 90 inputs the notification signal Sg of logic H to the voltage adjustment unit 91 on the condition that it is determined that the vehicle is in the rest mode. On the other hand, when it is determined that the vehicle is in the operation mode, the determination unit 90 inputs the notification signal Sg of logic L to the voltage adjustment unit 91.

[0071] When the notification signal Sg of logic H is input, the voltage adjustment unit 91 calculates an adjustment voltage command value Vuvw for adjusting the voltage applied to each phase winding 51U, 51V, 51W in order to control the voltage of the second capacitor 15b to the target voltage Vo. For example, in a situation where it is assumed that the implementation of Y drive control is restarted, the target voltage Vo is the same value as VB / 2 or a value in the vicinity of VB / 2. That the target voltage Vo is a value in the vicinity of VB / 2 means, for example, satisfying "0.99×VB / 2≦Vo≦1.01×VB / 2", "0.97×VB / 2≦Vo≦1.03×VB / 2", or "0.95×VB / 2≦Vo≦1.05×VB / 2".

[0072] Also, for example, in a situation where it is assumed that the implementation of H drive control is restarted, the target voltage Vo is VB or a value in the vicinity of VB. That the target voltage Vo is a value in the vicinity of VB means, for example, satisfying "0.99×VB≦Vo≦1.01×VB", "0.97×VB≦Vo≦1.03×VB", or "0.95×VB≦Vo≦1.05×VB".

[0073] For example, when Y drive control is selected during the operation mode, the voltage regulator 91 sets the target voltage Vo to VB / 2, or when H drive control is selected during the operation mode, the voltage regulator 91 sets the target voltage Vo to VB. The voltage regulator 91 inputs the calculated adjustment voltage command value Vuvw to the modulation unit 87.

[0074] The modulation unit 87 calculates, as each phase normalization command value Dutyu, Dutyv, Dutyw, a value obtained by dividing the input adjustment voltage command value Vuvw by 1 / 2 of the first detected voltage V1r. In this case, by performing switching control based on the calculated each phase normalization command values Dutyu, Dutyv, Dutyw, the 0th and 7th output voltages V0, V7 are alternately output.

[0075] Figures 9 and 10 show the current paths of the current flowing through the control system 100 during the implementation of the current supply process. As shown in Figure 9, during the output period of the 7th output voltage V7, a current flows through a closed circuit including the battery 10, each phase first upper arm switches SUHa, SVHa, SWHa, each phase windings 51U, 51V, 51W, each phase second upper arm diodes DUHb, DVHb, DWHb, the second capacitor 15b, and the negative side bus bar 12. In this case, a current is supplied from the battery 10 to the second capacitor 15b.

[0076] As shown in Figure 10, during the output period of the 0th output voltage V0, a reflux current flows through a closed circuit including each phase windings 51U, 51V, 51W, each phase second upper arm diodes DUHb, DVHb, DWHb, the second capacitor 15b, the negative side bus bar 12, and each phase first lower arm diodes DULa, DVLa, DWLa. In this embodiment, since the current flows by turning on each phase first lower arm diodes DULa, DVLa, DWLa, even by outputting only the 7th output voltage V7 among the 0th and 7th output voltages V0, V7, the operations described with reference to Figures 9 and 10 can be realized.

[0077] In the above-described current supply process, the voltage adjustment unit 91 calculates an adjustment voltage command value Vuvw such that the higher the target voltage Vo, the higher the V7 ratio. FIG. 11 shows the relationship between the target voltage Vo, each phase normalized command value Dutyu, Dutyv, Dutyw calculated based on the adjustment voltage command value Vuvw, and the V7 ratio. The voltage adjustment unit 91 calculates an adjustment voltage command value Vuvw so as to achieve the V7 ratio at which the voltage VC2 of the second capacitor 15b is controlled to the target voltage Vo. The modulation unit 87 calculates each phase normalized command value Dutyu, Dutyv, Dutyw based on the calculated adjustment voltage command value Vuvw. In this embodiment, the higher the target voltage Vo, the higher each phase normalized command value Dutyu, Dutyv, Dutyw is increased. As a result, the V7 ratio of the switching control performed in the current supply process is increased. Therefore, in the current supply process, it is possible to bring the voltage VC2 of the second capacitor 15b closer to the target voltage Vo that can be various values according to the state of the control system 100. As a result, a configuration suitable for performing the current supply process can be realized.

[0078] FIG. 12 shows a control processing procedure executed by the control device 60. Note that the control shown in FIG. 12 is repeatedly executed by the processor 60a of the control device 60, for example, at a predetermined control cycle.

[0079] In step S20, the determination unit 90 determines whether or not it is in the standby mode. If a negative determination is made in step S20, the determination unit 90 inputs a notification signal Sg of logic L to the voltage adjustment unit 91. Then, without executing the processes of steps S21 to S26, the process proceeds to step S27. In step S27, torque control is performed. On the other hand, if an affirmative determination is made in step S20, the process proceeds to step S21.

[0080] In step S21, the determination unit 90 determines whether or not the rotation electric machine 40 is in a drive preparation state. In the present embodiment, a signal SH input from the shift position sensor 66 is acquired, and when the acquired signal SH is a signal indicating that it is in the P range, step S21 is determined negatively. In this case, in the determination unit 90, a notification signal Sg of logic L is input to the voltage adjustment unit 91, and this control is terminated. On the other hand, when the acquired signal SH is a signal indicating that it is in the D range, step S21 is determined affirmatively. In this case, the process proceeds to step S22. Note that when the acquired signal SH is a signal indicating that it is in the R range, step S21 may be determined affirmatively.

[0081] In step S22, the determination unit 90 determines whether or not the voltage VC2 of the second capacitor 15b has decreased. In the present embodiment, when the detection voltage V2r input from the second voltage sensor 62 is equal to or lower than the determination voltage VL, it is determined that the voltage VC2 of the second capacitor 15b has decreased. The determination voltage VL may be any voltage lower than the target voltage Vo. For example, it may be "0.8×Vo≦VL≦0.9×Vo", "0.7×Vo≦VL≦0.8×Vo", "0.6×Vo≦VL≦0.7×Vo", "0.5×Vo≦VL≦0.6×Vo", "0.4×Vo≦VL≦0.5×Vo", "0.3×Vo≦VL≦0.4×Vo", "0.2×Vo≦VL≦0.3×Vo", or "0.1×Vo≦VL≦0.2×Vo".

[0082] When a negative determination is made in step S22, in the determination unit 90, a notification signal Sg of logic L is input to the voltage adjustment unit 91, and this control is terminated. On the other hand, when an affirmative determination is made in step S22, a notification signal Sg of logic H is input to the voltage adjustment unit 91, and the process proceeds to step S23. Note that the determination unit 90 corresponds to a "rest determination unit" and a "voltage determination unit".

[0083] In step S23, the voltage adjustment unit 91 and the modulation unit 87 perform a current supply process for controlling the voltage VC2 of the second capacitor 15b to the target voltage Vo. Then, the process proceeds to step S24. Note that the modulation unit 87 and the voltage adjustment unit 91 correspond to a "current supply unit".

[0084] In this embodiment, the execution of the current supply process is continued until it is determined that the voltage VC2 of the second capacitor 15b has reached the target voltage Vo, or until it is determined that the driving of the rotating electric machine 40 is restarted. Specifically, in step S24, the determination unit 90 determines whether or not the voltage VC2 of the second capacitor 15b has reached the target voltage Vo. It is possible to use the detected voltage V2r of the second voltage sensor 62 to determine whether or not the voltage VC2 of the second capacitor 15b has reached the target voltage Vo. If an affirmative determination is made in step S24, the process proceeds to step S25. In step S25, the determination unit 90 inputs the notification signal Sg of logic L to the voltage adjustment unit 91. Thereby, the current supply process is stopped. On the other hand, if a negative determination is made in step S24, the process proceeds to step S26.

[0085] In step S26, the determination unit 90 determines whether or not the driving of the rotating electric machine 40 is restarted based on at least one of the torque command value Trq* and the accelerator operation amount Ac. For example, if it is determined that the torque command value Trq* is higher than the torque determination value, it is determined that the driving of the rotating electric machine 40 is restarted. Also, for example, if it is determined that the accelerator operation amount Ac is higher than the operation amount determination value, it is determined that the driving of the rotating electric machine 40 is restarted. It is also possible to determine whether or not the driving of the rotating electric machine 40 is restarted based on both the torque command value Trq* and the accelerator operation amount Ac.

[0086] If an affirmative determination is made in step S26, the process proceeds to step S27. In this case, the determination unit 90 inputs the notification signal Sg of logic L to the voltage adjustment unit 91. On the other hand, if a negative determination is made in step S26, this control is terminated. In this case, the determination unit 90 inputs the notification signal Sg of logic H to the voltage adjustment unit 91. Thereby, the execution of the current supply process is continued.

[0087] Next, while referring to FIG. 13, the operation and effect when the above-described control is executed will be described. Here, similar to the previous FIG. 6, a situation is assumed where after the Y drive control is temporarily stopped, the execution of the Y drive control is resumed. FIGS. 13(a) to (d) correspond to FIGS. 6(a) to (d) above.

[0088] At time t1, the Y drive control is stopped. Accordingly, the voltage VC2 of the second capacitor 15b starts to decrease. Here, it is assumed that the shift position is in the D range and the vehicle has stopped running.

[0089] At time t2, the determination unit 90 determines that it is in the rest mode, determines that it is in the drive preparation state, and determines that the voltage VC2 of the second capacitor 15b has decreased to the determination voltage VL. In this case, the determination unit 90 inputs a notification signal Sg of logic H to the voltage adjustment unit 91. Therefore, the voltage adjustment unit 91 calculates an adjustment voltage command value Vuvw for controlling the voltage VC2 of the second capacitor 15b to the target voltage Vo. The modulation unit 87 calculates each phase normalized command value Dutyu, Dutyv, Dutyw based on the adjustment voltage command value Vuvw, and performs switching control of each switch SUHa to SWLa in the first inverter 20 based on the calculated each phase normalized command value Dutyu, Dutyv, Dutyw.

[0090] After time t2, when the determination unit 90 determines that the voltage VC2 of the second capacitor 15b has reached the target voltage Vo, the determination unit 90 inputs a notification signal Sg of logic L to the voltage adjustment unit 91. In this case, the voltage adjustment unit 91 stops calculating the adjustment voltage command value Vuvw. As a result, the voltage VC2 of the second capacitor 15b starts to decrease again.

[0091] At time t3, when the determination unit 90 determines again that the voltage VC2 of the second capacitor 15b is decreasing, the current supply process is performed again in the same manner as described at time t2. Further, after time t3, when the determination unit 90 determines that the voltage VC2 of the second capacitor 15b has reached the target voltage Vo, the current supply process is stopped.

[0092] At time t4, the rotary electric machine 40 is restarted. In this case, the control device 60 performs switching control at the V7 ratio, which is the same as before the Y drive control was stopped. The voltage VC2 of the second capacitor 15b at time t4 is a voltage value VM that is higher than the determination voltage VL. This makes it possible to prevent a difference from occurring between the voltage value VM at time t4 and the voltage value VB / 2 applied to the second capacitor 15b when the rotary electric machine 40 is restarted.

[0093] In this embodiment, during the pause mode, a current supply process is executed to supply current from the battery 10 to the second capacitor 15b via the phase windings 51U, 51V, and 51W and the second inverter 30. This charges the second capacitor 15b during the pause mode, and suppresses a voltage drop in the second capacitor 15b. This makes it possible to suppress a difference between the voltage of the second capacitor 15b during the pause mode and the voltage applied to the second capacitor 15b when the rotary electric machine 40 resumes operation. As a result, it is possible to suppress an unintended current from flowing through the control system 100 when the rotary electric machine 40 resumes operation.

[0094] The current supply process is executed on the condition that it is determined that the power supply is in the sleep mode and that the voltage VC2 of the second capacitor 15b has dropped. This prevents the current supply process from being executed excessively even when the voltage VC2 of the second capacitor 15b has not dropped significantly. This prevents power loss, such as switching loss, that would occur when the current supply process is executed.

[0095] Also, when it is determined that the voltage VC2 of the second capacitor 15b has reached the target voltage Vo, the current supply process is stopped. As a result, the current supply process can be performed intermittently. Therefore, it is possible to accurately suppress the occurrence of power loss in the control system 100. Therefore, it is possible to realize a configuration suitable for suppressing the occurrence of power loss in the control system 100 while suppressing the flow of an unintended current through the control system 100.

[0096] The detected voltage V2r of the second voltage sensor 62 is input to the determination unit 90, and based on the input detected voltage V2r, it is determined whether or not the voltage VC2 of the second capacitor 15b has decreased. As a result, it is possible to appropriately determine whether or not the voltage VC2 of the second capacitor 15b has decreased.

[0097] The current supply process is performed on the condition that it is determined that the rotating electrical machine 40 is in a drive preparation state. As a result, the current supply process can be performed in a situation where the restart of driving of the rotating electrical machine 40 is assumed during the standby mode. Therefore, it is possible to suppress the excessive execution of the current supply process during the standby mode and the occurrence of power loss in the control system 100.

[0098] The switching control of the first upper arm switches SUHa, SVHa, SWHa of each phase in the current supply process is synchronized. As a result, it is possible to charge the second capacitor 15b while suppressing the generation of torque in the rotating electrical machine 40 during the execution of the current supply process.

[0099] <Second Embodiment> Instead of the positive - side switching switch QH, as shown in FIGS. 14 and 15, the control system 100 may be provided with a negative - side switching switch QL. The negative - side switching switch QL may be provided between the first inverter 20 and the second inverter 30 in the negative - side bus 12. Specifically, the negative - side switching switch QL may be provided between the connection points of the negative - side bus 12 with each - phase first lower - arm switches SULa, SVLa, SWLa and the connection points of the negative - side bus 12 with each - phase second lower - arm switches SULb, SVLb, SWLb. The negative - side switching switch QL, when turned on, electrically connects the first inverter 20 and the second inverter 30, and when turned off, electrically disconnects the first inverter 20 and the second inverter 30. The control device 60 may control the negative - side switching switch QL.

[0100] For example, the negative - side switching switch QL is a semiconductor switching element such as an IGBT or a relay. When an IGBT is used as the negative - side switching switch QL, a free - wheel diode is connected in parallel to the negative - side switching switch QL. In this case, for the free - wheel diode connected in parallel to the negative - side switching switch QL, the anode is electrically connected to the first - inverter 20 side, and the cathode is electrically connected to the second - inverter 30 side.

[0101] When Y - drive control is selected by the selection unit 86, the modulation unit 87, as Y - drive control, turns off the negative - side switching switch QL and performs control to PWM - drive each switch SUHa~SWLa of the first inverter 20. Also, each - phase second lower - arm switches SULb, SVLb, SWLb are fixed in the on state, and each - phase second upper - arm switches SUHb, SVHb, SWHb are fixed in the off state.

[0102] In this embodiment, the control device 60 is capable of performing current supply processing. Specifically, similar to the first embodiment, when a notification signal Sg of logic H is input, the voltage adjustment unit 91 calculates an adjusted voltage command value Vuvw. The modulation unit 87 calculates each phase normalization command value Dutyu, Dutyv, Dutyw. Based on the calculated each phase normalization command values Dutyu, Dutyv, Dutyw, switching control of the first inverter 20 is performed, whereby the 0th and 7th output voltages V0, V7 are alternately output.

[0103] FIGS. 14 and 15 show current paths of currents flowing through the control system 100 during the implementation of the current supply processing. As shown in FIG. 14, during the output period of the 0th output voltage V0, a current flows through a closed circuit including the battery 10, the positive electrode side bus 11, the second capacitor 15b, each phase second lower arm diodes DULb, DVLb, DWLb, each phase windings 51U, 51V, 51W, and each phase first lower arm switches SULa, SVLa, SWLa. In this case, a current is supplied from the battery 10 to the second capacitor 15b.

[0104] As shown in FIG. 15, during the output period of the 7th output voltage V7, a reflux current flows through a closed circuit including each phase windings 51U, 51V, 51W, each phase first upper arm diodes DUHa, DVHa, DWHa, the positive electrode side bus 11, the second capacitor 15b, and each phase second lower arm diodes DULb, DVLb, DWLb. In this embodiment, since a current is supplied from the battery 10 to the second capacitor 15b during the output period of the 0th output voltage V0, the higher the V0 ratio correlated with the length of the output period of the 0th output voltage V0, the higher the voltage VC2 of the second capacitor 15b becomes. The V0 ratio is the ratio of the output period of the 0th output voltage V0 to the total of the output periods of the 0th and 7th output voltages V7 in one switching cycle. Note that since each phase first upper arm diodes DUHa, DVHa, DWHa are turned on and a current flows, by outputting only the 0th output voltage V0 among the 0th and 7th output voltages V0, V7, the operations described with reference to FIGS. 9 and 10 can also be realized.

[0105] In this embodiment, in the current supply process described above, the voltage adjustment unit 91 may calculate the adjusted voltage command value Vuvw such that the higher the target voltage Vo, the higher the V0 ratio. In this case, the higher the target voltage Vo, the lower the phase normalization command values Dutyu, Dutyv, and Dutyw. As a result, the V0 ratio of the switching control performed in the current supply process according to this embodiment is increased. Therefore, the voltage VC2 of the second capacitor 15b can be made closer to the target voltage Vo that can be various values according to the state of the control system 100. As a result, a configuration suitable for performing the current supply process can be realized.

[0106] <Other Embodiments> Note that each of the above embodiments may be implemented with the following modifications.

[0107] · In step S22 of the previous FIG. 12, in the determination unit 90, instead of the detected voltage V2r of the second voltage sensor 62, it may be determined whether the voltage VC2 of the second capacitor 15b has decreased based on the elapsed time since it was determined that it is in the standby mode. When the determination unit 90 determines that the elapsed time since it was determined that it is in the standby mode has passed the determination time, it determines that the voltage VC2 of the second capacitor 15b has decreased. For example, as the determination time, a value determined in advance based on the characteristics of the second capacitor 15b may be used. Also, for example, the determination unit 90 may set the determination time based on the V7 ratio before the stop of the Y drive control.

[0108] · The processes of steps S24 and S25 in the previous FIG. 12 may not be performed. Even in this case, by continuing the implementation of the current supply process during the period from when the current supply process is started until it is determined that the driving of the rotating electrical machine 40 is restarted, it is possible to suppress the decrease in the voltage VC2 of the second capacitor 15b.

[0109] · In the previous FIG. 12, the process of step S22 may be performed based on the elapsed time since it is determined that the system is in the standby mode, and the processes of steps S24 and S25 may not be performed. In this case, the control system 100 may not be provided with the second voltage sensor 62.

[0110] · The modulation unit 87 may make the frequency of the carrier signal generated in the process of step S23 in the previous FIG. 12 higher than the frequency of the carrier signal generated in the process of step S27. In other words, the switching frequency of the first inverter 20 in the current supply process may be made higher than the switching frequency of the first inverter 20 in the torque control. Thereby, it is possible to reduce the occurrence of vibration and noise in the current supply process. As a result, NV (Noise Vibration) can be improved.

[0111] · In a situation where the restart of the drive of the rotating electrical machine 40 is assumed by H drive control, the target voltage Vo of the current supply process may be set to a value near the voltage VB of the battery 10 or VB. In this case, in step S25 of the previous FIG. 12, in addition to inputting the notification signal Sg of logic L to the voltage adjustment unit 91 in the determination unit 90, the positive electrode side switching switch QH or the negative electrode side switching switch QL may be turned on. Thereby, the voltage VC2 of the second capacitor 15b is maintained near the voltage VB of the battery 10. Therefore, it is possible to realize a configuration suitable for restarting the restart of the drive of the rotating electrical machine 40 by H drive control while suppressing the flow of an unintentional current in the control system 100.

[0112] · It is not necessary to perform the determination process of at least one of steps S21 and S22 in the previous FIG. 12. Even in this case, when it is determined that the system is in the standby mode, the current supply process can be performed.

[0113] · In each of the above embodiments, as the current supply process, the first upper arm switches SUHa, SVHa, SWHa and the first lower arm switches SULa, SVLa, SWLa of each phase are turned on and off synchronously. However, the current supply process is not limited to this. For example, in the first embodiment, the control device 60 may perform switching control to turn on and off the first upper arm switches in one or two phases of each phase as the current supply process. Further, for example, in the second embodiment, the control device 60 may perform switching control to turn on and off the first lower arm switches in one or two phases of each phase as the current supply process. Even when these current supply processes are performed, it is possible to supply current from the battery 10 to the second capacitor 15b via the winding of one or two phases and the second inverter 30.

[0114] However, when current flows through the windings of one or two phases of each phase, torque of the rotating electrical machine 40 may be generated. In this regard, in the first embodiment and the second embodiment, the first upper arm switches SUHa, SVHa, SWHa and the first lower arm switches SULa, SVLa, SWLa of each phase are turned on and off synchronously. Thereby, it is possible to charge the second capacitor 15b while suppressing the generation of torque of the rotating electrical machine 40 during the standby mode.

[0115] · The control system 100 may include a positive electrode side switching switch QH and a negative electrode side switching switch QL.

[0116] In each of the above embodiments, the modulation unit 87 may perform PWM driving based on space vector modulation instead of PWM driving based on the comparison of the command value and the carrier signal.

[0117] · The resistance part is not limited to the discharge resistor, and may be a parasitic resistance existing between the respective buses 11 and 12.

[0118] · The DC power supply is not limited to the battery, and may be, for example, a fuel cell.

[0119] The rotating electric machine is not limited to a three-phase one, but may be a two-phase one or a four-phase or more one.

[0120] The semiconductor switches constituting the first inverter and the second inverter are not limited to IGBTs, but may be, for example, N-channel MOSFETs. In this case, the high-potential terminal of the switch is the drain, and the low-potential terminal is the source. Each switch also has a body diode.

[0121] The inverter, rotating electric machine, and control device may be installed in a mobile body other than a vehicle, such as an aircraft or a ship. If the mobile body is an aircraft, the rotating electric machine serves as a power source for the aircraft's flight, and if the mobile body is a ship, the rotating electric machine serves as a power source for the ship's navigation. Furthermore, the inverter, rotating electric machine, and control device may be installed in a mobile body other than a vehicle.

[0122] The control device and method described herein may be implemented by a special-purpose computer configured with a processor and memory programmed to perform one or more functions embodied in a computer program. Alternatively, the control device and method described herein may be implemented by a special-purpose computer configured with a processor comprising one or more dedicated hardware logic circuits. Alternatively, the control device and method described herein may be implemented by one or more special-purpose computers configured with a processor and memory programmed to perform one or more functions in combination with a processor configured with one or more hardware logic circuits. Furthermore, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by a computer.

[0123] The following describes characteristic configurations extracted from the above-described embodiments. [Configuration 1] a rotating electric machine (40) having windings (51U, 51V, 51W) of multiple phases; A first inverter (20) having the same number of phases as the number of phases of series-connected first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SULa, SVLa, SWLa), and a series connection of the first upper arm switches and the first lower arm switches being electrically connected in parallel to a DC power supply (10), A second inverter (30) having the same number of phases as the number of phases of series-connected second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb), and a series connection of the second upper arm switches and the second lower arm switches being electrically connected in parallel to a capacitor (15b) and a resistor section (16b), A positive bus bar (11) that electrically connects the high-potential side terminals of the first upper arm switches and the high-potential side terminals of the second upper arm switches in each phase, A negative bus bar (12) that electrically connects the low-potential side terminals of the first lower arm switches and the low-potential side terminals of the second lower arm switches in each phase, A switching switch (QH, QL) provided on at least one of the positive bus bar and the negative bus bar, A control device (60) for a rotating electrical machine applied to a system (100) including: In each phase, the low-potential side terminal of the first upper arm switch and the high-potential side terminal of the first lower arm switch are electrically connected to the first end of the winding, In each phase, the low-potential side terminal of the second upper arm switch and the high-potential side terminal of the second lower arm switch are electrically connected to the second end of the winding, A rest determination unit (90) that determines whether or not it is in a rest mode in which the rotating electrical machine is driven to a stop while the switching switch is off, A current supply unit (87, 91) that supplies a current from the DC power supply to the capacitor via the winding and the second inverter by performing switching control on at least one of the first upper arm switch and the first lower arm switch on the condition that it is determined that it is in the rest mode, A control device for a rotating electrical machine, comprising: [Configuration 2] a voltage determination unit (90) that determines whether or not the voltage of the capacitor has decreased when it is determined that the standby mode is in progress; The current supply unit performs the switching control on the condition that it is determined that the standby mode is in progress and it is determined that the voltage of the capacitor has decreased. The control device for a rotating electrical machine according to Configuration 1. [Configuration 3] The voltage determination unit when it is determined that the standby mode is in progress, determines whether or not the voltage of the capacitor has reached a target voltage by performing the switching control, The control device for a rotating electrical machine according to Configuration 2, wherein when it is determined that the voltage of the capacitor has reached the target voltage, the switching control is stopped. [Configuration 4] The target voltage is the same value as the power supply voltage value of the DC power supply or a value in the vicinity of the power supply voltage value, The voltage determination unit stops the switching control and turns on the changeover switch when it is determined that the voltage of the capacitor has reached the target voltage. The control device for a rotating electrical machine according to Configuration 3. [Configuration 5] The voltage determination unit determines whether or not the voltage of the capacitor has decreased based on a voltage sensor (62) that detects the voltage of the capacitor. The control device for a rotating electrical machine according to any one of Configurations 2 to 4. [Configuration 6] The voltage determination unit determines whether or not the voltage of the capacitor has decreased based on the elapsed time since it was determined that the standby mode is in progress. The control device for a rotating electrical machine according to any one of Configurations 2 to 4. [Configuration 7] The changeover switch is provided at least on the positive electrode side bus among the positive electrode side bus and the negative electrode side bus, The current supply unit synchronizes the switching control in the first upper arm switches of each phase in a state where the changeover switch provided on the positive electrode side bus is turned off. The control device for a rotating electrical machine according to any one of Configurations 1 to 6. [Configuration 8] In the switching control executed with the changeover switch provided on the positive electrode side busbar turned off, the current supply unit increases the ratio of the period during which the first upper arm switch of each phase is turned on in one switching period as the target voltage of the voltage of the capacitor is higher. The control device for a rotating electrical machine according to Configuration 7. [Configuration 9] The changeover switch is provided on at least the negative electrode side busbar among the positive electrode side busbar and the negative electrode side busbar. In a state where the changeover switch provided on the negative electrode side busbar is turned off, the current supply unit synchronizes the switching control in the first lower arm switch of each phase. The control device for a rotating electrical machine according to any one of Configurations 1 to 6. [Configuration 10] In the switching control executed with the changeover switch provided on the negative electrode side busbar turned off, the current supply unit increases the ratio of the period during which the first lower arm switch of each phase is turned on in one switching period as the target voltage of the voltage of the capacitor is higher. The control device for a rotating electrical machine according to Configuration 9. [Configuration 11] It includes a torque control unit (87) that performs torque control of the rotating electrical machine. The current supply unit makes the switching frequency of the switching control executed in the stop mode higher than the switching frequency of the torque control. The control device for a rotating electrical machine according to any one of Configurations 1 to 10. [Configuration 12] The stop determination unit determines whether it is in the stop mode and whether the rotating electrical machine is in a drive preparation state. The current supply unit performs the switching control on the condition that it is determined that it is in the stop mode and it is determined that it is in the drive preparation state. The control device for a rotating electrical machine according to any one of Configurations 1 to 11.

Explanation of Signs

[0124] 10… Battery, 11… Positive electrode side busbar, 12… Negative electrode side busbar, 15b… Second capacitor, 16b… Second resistor, 20, 30… First, second inverters, 40… Rotating electrical machine, 51U, 51V, 51W… U, V, W phase windings, 60… Control device, 87… Modulation unit, 90… Judgment unit, 91… Voltage adjustment unit, 100… Control system, QH, QL… Positive electrode side, negative electrode side switching switches.

Claims

1. A rotating electrical machine (40) having windings (51U, 51V, 51W) of multiple phases, A first inverter (20) having as many first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SUL a, SVL a, SWL a) connected in series as the number of phases, and a series connection of the first upper arm switch and the first lower arm switch being electrically connected in parallel to a DC power supply (10), A second inverter (30) having as many second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb) connected in series as the number of phases, and a series connection of the second upper arm switch and the second lower arm switch being electrically connected in parallel to a capacitor (15b) and a resistor section (16b), In each phase, a positive electrode side bus bar (11) electrically connecting the high potential side terminals of the first upper arm switch and the high potential side terminals of the second upper arm switch, In each phase, a negative electrode side bus bar (12) electrically connecting the low potential side terminals of the first lower arm switch and the low potential side terminals of the second lower arm switch, A switching switch (QH, QL) provided on at least one of the positive electrode side bus bar and the negative electrode side bus bar, A control device (60) for a rotating electrical machine applied to a system (100) comprising: In each phase, the low potential side terminal of the first upper arm switch and the high potential side terminal of the first lower arm switch are electrically connected to the first end of the winding, In each phase, the low potential side terminal of the second upper arm switch and the high potential side terminal of the second lower arm switch are electrically connected to the second end of the winding, A rest determination unit (90) for determining whether or not it is in a rest mode in which the rotating electrical machine is driven to stop in a state where the switching switch is turned off, A current supply unit (87, 91) that supplies current from the DC power supply to the capacitor via the winding and the second inverter by performing switching control of at least one of the first upper arm switch and the first lower arm switch on the condition that it is determined that it is in the rest mode, A control device for a rotating electrical machine, comprising:

2. A voltage determination unit (90) for determining whether or not the voltage of the capacitor has decreased when it is determined that it is in the rest mode, The control device for a rotating electrical machine according to claim 1, wherein the current supply unit performs the switching control on the condition that it is determined that the machine is in the stop mode and it is determined that the voltage of the capacitor has decreased.

3. The voltage determination unit when it is determined that the machine is in the stop mode, determines whether or not the voltage of the capacitor has reached a target voltage by performing the switching control, and when it is determined that the voltage of the capacitor has reached the target voltage, stops the switching control, the control device for a rotating electrical machine according to claim 2.

4. The target voltage is the same value as the power supply voltage value of the DC power supply or a value near the power supply voltage value, and when it is determined that the voltage of the capacitor has reached the target voltage, the voltage determination unit stops the switching control and turns on the changeover switch, the control device for a rotating electrical machine according to claim 3.

5. The voltage determination unit determines whether or not the voltage of the capacitor has decreased based on a voltage sensor (62) that detects the voltage of the capacitor, the control device for a rotating electrical machine according to any one of claims 2 to 4.

6. The voltage determination unit determines whether or not the voltage of the capacitor has decreased based on the elapsed time since it was determined that the machine is in the stop mode, the control device for a rotating electrical machine according to any one of claims 2 to 4.

7. The changeover switch is provided on at least the positive electrode side bus among the positive electrode side bus and the negative electrode side bus, and the current supply unit synchronizes the switching control in the first upper arm switches of each phase in a state where the changeover switch provided on the positive electrode side bus is turned off, the control device for a rotating electrical machine according to claim 1.

8. In the switching control executed by the current supply unit in a state where the changeover switch provided on the positive electrode side bus is turned off, the higher the target voltage of the voltage of the capacitor, the higher the ratio of the period during which the first upper arm switches of each phase are turned on in one switching cycle, the control device for a rotating electrical machine according to claim 7.

9. The changeover switch is provided on at least the negative electrode side bus among the positive electrode side bus and the negative electrode side bus, The control device for a rotating electrical machine according to claim 1, wherein the current supply unit synchronizes the switching control in the first lower arm switches of each phase in a state where the switching switch provided on the negative electrode side bus is turned off.

10. In the switching control executed by the current supply unit in a state where the switching switch provided on the negative electrode side bus is turned off, the higher the target voltage of the voltage of the capacitor, the higher the ratio of the period during which the first lower arm switches of each phase are turned on in one switching period. The control device for a rotating electrical machine according to claim 9.

11. Comprising a torque control unit (87) for performing torque control of the rotating electrical machine, The control device for a rotating electrical machine according to claim 1, wherein the current supply unit makes the switching frequency of the switching control executed in the stop mode higher than the switching frequency of the torque control.

12. The stop determination unit determines whether or not it is in the stop mode and whether or not the rotating electrical machine is in a drive preparation state, The control device for a rotating electrical machine according to claim 1, wherein the current supply unit performs the switching control on the condition that it is determined that it is in the stop mode and it is determined that the rotating electrical machine is in the drive preparation state.

13. A rotating electrical machine (40) having windings (51U, 51V, 51W) of a plurality of phases, A first inverter (20) having a number of phases of first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SULa, SVLa, SWLa) connected in series, and a series connection of the first upper arm switches and the first lower arm switches being electrically connected in parallel to a DC power supply (10), A second inverter (30) having a number of phases of second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb) connected in series, and a series connection of the second upper arm switches and the second lower arm switches being electrically connected in parallel to a capacitor (15b) and a resistance unit (16b), A positive electrode side bus (11) that electrically connects the high potential side terminals of the first upper arm switches and the high potential side terminals of the second upper arm switches in each phase, A negative electrode side bus (12) that electrically connects the low potential side terminals of the first lower arm switches and the low potential side terminals of the second lower arm switches in each phase, A switching switch (QH, QL) provided on at least one of the positive electrode side bus bar and the negative electrode side bus bar A program applied to a system (100) comprising In each phase, a low potential side terminal of the first upper arm switch and a high potential side terminal of the first lower arm switch are electrically connected to a first end of the winding In each phase, a low potential side terminal of the second upper arm switch and a high potential side terminal of the second lower arm switch are electrically connected to a second end of the winding To a processor (60a) A rest determination process for determining whether or not the rotating electric machine is in a rest mode in which driving is stopped with the switching switch turned off Based on the condition that it is determined that the machine is in the rest mode, a current supply process for supplying a current from the DC power supply to the capacitor via the winding and the second inverter by performing switching control of at least one of the first upper arm switch and the first lower arm switch A program for causing the above to be executed [

14. ] A rotating electric machine (40) having a plurality of phase windings (51U, 51V, 51W) A first inverter (20) having a number of phases of first upper arm switches (SUHa, SVHa, SWHa) and first lower arm switches (SULa, SVLa, SWLa) connected in series, and the series connection of the first upper arm switch and the first lower arm switch being electrically connected in parallel to a DC power supply (10) A second inverter (30) having a number of phases of second upper arm switches (SUHb, SVHb, SWHb) and second lower arm switches (SULb, SVLb, SWLb) connected in series, and the series connection of the second upper arm switch and the second lower arm switch being electrically connected in parallel to a capacitor (15b) and a resistor section (16b) A positive electrode side bus bar (11) for electrically connecting a high potential side terminal of the first upper arm switch and a high potential side terminal of the second upper arm switch in each phase A negative electrode side bus bar (12) for electrically connecting a low potential side terminal of the first lower arm switch and a low potential side terminal of the second lower arm switch in each phase A switching switch (QH, QL) provided on at least one of the positive electrode side bus bar and the negative electrode side bus bar A control method for a rotating electric machine applied to a system (100) comprising In each phase, the low-potential side terminal of the first upper arm switch and the high-potential side terminal of the first lower arm switch are electrically connected to the first end of the winding. In each phase, the low-potential side terminal of the second upper arm switch and the high-potential side terminal of the second lower arm switch are electrically connected to the second end of the winding. A rest determination process for determining whether or not it is in a rest mode in which the rotating electrical machine is driven to a stop in a state where the changeover switch is turned off. Based on the condition that it is determined that it is in the rest mode, by performing switching control of at least one of the first upper arm switch and the first lower arm switch, a current supply process for supplying a current from the DC power supply to the capacitor via the winding and the second inverter. A control method for a rotating electrical machine, including the above.

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