JP6645405B2 - Rotary electric machine control device, rotary electric machine unit - Google Patents

Description

  The present invention relates to a control device for controlling a rotating electric machine.

  2. Description of the Related Art Conventionally, there is a type in which a power generation mode by a rotating electric machine is switched between when the rotation speed of the rotating electric machine is equal to or lower than a predetermined value and when the rotation speed exceeds the predetermined value (see Patent Document 1). According to the technique disclosed in Patent Document 1, when the rotation speed of the rotating electric machine is equal to or lower than a predetermined value, the field current flowing through the field coil is controlled, and the switching element is controlled so that the current controlled by the PWM control is supplied to the armature coil. Power is supplied to generate power by PWM control. When the rotation speed of the rotating electric machine exceeds a predetermined value, power generation is performed by controlling the field current flowing through the field coil without performing the PWM control.

JP-A-2006-189698

  By the way, power generation by controlling the field current can be performed only when the rotation speed of the rotating electric machine exceeds a predetermined value and the power generation output of the rotating electric machine exceeds the predetermined output. However, if power generation by PWM control is performed when the rotation speed of the rotating electric machine is equal to or lower than a predetermined value, switching loss due to control of the switching element increases.

  The present invention has been made to solve the above problems, and a main object of the present invention is to provide a control device for a rotating electric machine that can increase the power generation output of the rotating electric machine while suppressing an increase in switching loss. To provide.

A first means for solving the above-mentioned problem is:
A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electric machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
When the synchronous rectification control unit generates power, when the current flowing through the diode becomes smaller than a predetermined current, the on / off timing of the switching element is extended so as to extend the period in which the switching element is turned on by the synchronous rectification control unit. A timing change unit for changing
Is provided.

  According to the above configuration, the power conversion unit includes the bridge-connected switching elements and the diodes respectively connected in parallel to the switching elements, and performs power conversion between the rotating electric machine and the power storage device. Then, at the time of power generation by the rotating electric machine, the switching element connected in parallel to the diode through which the current flows is turned on by the synchronous rectification control unit in synchronization with the period during which the current flows through the diode. Therefore, the power storage device can be efficiently charged by the electric power output from the rotating electric machine.

  Here, when the voltage generated by the rotating electric machine becomes lower than the voltage of the power storage device during power generation by the synchronous rectification control unit, current does not flow through the diode. For this reason, in the power generation by the synchronous rectification control unit, power cannot be output from the rotating electric machine. In this regard, the timing change unit is configured to extend the period in which the switching element is turned on by the synchronous rectification control unit when the current flowing through the diode becomes smaller than a predetermined current during power generation by the synchronous rectification control unit. Change the on / off timing of. For this reason, electric power can be output from the rotating electrical machine, or the output power can be increased, and the power generation output of the rotating electrical machine can be increased. In addition, since the number of times of switching the switching element does not increase, it is possible to suppress an increase in switching loss as compared with the case where PWM control is performed. In particular, the case where the current flowing through the diode becomes smaller than the predetermined current may be the case where the diode current stops flowing.

  Note that the configuration for extending the period in which the switching element is turned on includes a configuration in which the timing for turning on the switching element is advanced, a configuration in which the timing for turning off the switching element is delayed, and a configuration for performing both of them. .

  In the second means, the timing change section gradually changes the on / off timing of the switching element when extending the period during which the switching element is turned on by the synchronous rectification control section.

  According to the above configuration, when extending the period in which the switching element is turned on, the on / off timing of the switching element is gradually changed. For this reason, it is possible to suppress fluctuations in the torque applied by the rotating electric machine and the output current and voltage.

  In the third means, the timing changing section shortens a period during which the switching element is turned on when shifting from a state in which the on / off timing of the switching element is changed to power generation by the synchronous rectification control section. The on / off timing of the switching element is changed.

  In a state where power is being generated at the on / off timing changed from the on / off timing of the switching element by the synchronous rectification control unit, it may be necessary to shift to power generation by the synchronous rectification control unit.

  In this regard, according to the above configuration, when shifting from the state in which the on / off timing of the switching element is changed to the generation by the synchronous rectification control unit, the on / off of the switching element is shortened so that the period in which the switching element is on is shortened. Timing changes. For this reason, it is possible to shift from the state where the on / off timing of the switching element is changed to the generation by the synchronous rectification control unit.

  In a fourth aspect, the timing change section gradually changes the on / off timing of the switching element when shortening the period for turning on the switching element.

  According to the above configuration, when the period during which the switching element is turned on is shortened by the timing changing unit, the on / off timing of the switching element is gradually changed. For this reason, it is possible to suppress fluctuations in the torque applied by the rotating electric machine and the output current and voltage.

  In the fifth means, at the time of power generation by the rotating electrical machine, the switching elements corresponding to each phase of the rotating electrical machine are alternately turned on and off by half a cycle of one electrical angle, and the switching elements are turned on. A rectangular wave control unit (14, 20) for controlling a phase to be performed, wherein the timing change unit controls the synchronous rectification control unit by the synchronous rectification control unit when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit. The on / off timing of the switching element is changed such that the ON period has a length between the length of the period in which the switching element is turned on and the length of the period in which the switching element is turned on by the rectangular wave control unit. .

  According to the above configuration, at the time of electric power generation by the rotating electric machine, the switching elements corresponding to each phase of the rotating electric machine are alternately turned on and off by a half cycle of one electrical angle cycle by the rectangular wave control unit, and the switching element Are turned on. For this reason, power generation can be performed by the rotating electric machine while suppressing switching loss as compared with the case of performing PWM control.

  Here, when switching between the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit, the timing change unit determines the length of the period during which the switching element is turned on by the synchronous rectification control unit and the switching element by the rectangular wave control unit. The ON / OFF timing of the switching element is changed so that the ON period has a length between the ON period and the ON period. Therefore, it is possible to switch between the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit while maintaining the state of outputting the electric power from the rotating electric machine.

  In the power generation by the rectangular wave control unit, the phase at which the switching element is turned on is controlled. For this reason, the phase in which the switching element is turned on in the power generation by the rectangular wave control unit is different from the phase in which the switching element is turned on in the power generation by the synchronous rectification control unit.

  In this regard, in the sixth aspect, the timing change unit is configured to switch the phase at which the switching element is turned on by the synchronous rectification control unit when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit. The on / off timing of the switching element is changed so that the phase is between the phase at which the switching element is turned on by the rectangular wave control unit. Therefore, when switching between the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit, it is possible to suppress a sudden change in the phase in which the switching element is turned on. As a result, it is possible to suppress a sudden change in the torque applied by the rotating electric machine and the output current and voltage.

  In a seventh means, the timing change section gradually changes the on / off timing of the switching element when changing the phase for turning on the switching element.

  According to the above configuration, when the phase at which the switching element is turned on is changed by the timing changing unit, the on / off timing of the switching element is gradually changed. For this reason, it is possible to suppress fluctuations in the torque applied by the rotating electric machine and the output current and voltage.

  When switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit, if the amount of change in the power generation output by the rotating electric machine is large, noise and vibration may be generated in the rotating electric machine.

  In this regard, in the eighth aspect, the timing change unit is configured such that, when switching between the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit, the amount of change in the power generation output by the rotating electric machine is smaller than a predetermined amount. In this case, the on / off timing of the switching element is changed. Therefore, when switching between the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit, it is possible to suppress generation of noise and vibration in the rotating electric machine.

  Specifically, as in a ninth means, when the rotation speed of the rotating electric machine is lower than a predetermined rotation speed, the rectangular wave control unit controls each phase of the rotating electric machine during power generation by the rotating electric machine. The corresponding switching elements are turned on and off alternately by half a cycle of one electrical angle, and the phase at which the switching elements are turned on is controlled. When the rotation speed is higher than the predetermined rotation speed, a configuration is adopted in which, when power is generated by the rotating electric machine, the switching element connected in parallel to the diode in which current flows is turned on in synchronization with a period in which current flows in the diode. be able to.

  A tenth means is a rotating electrical machine unit (10), the rotating electrical machine control device (14) according to any one of the first to ninth means, the rotating electrical machine (17), and the power converter. (13).

  According to the configuration, in the rotating electrical machine unit including the rotating electrical machine control device, the rotating electrical machine, and the power conversion unit, it is possible to increase the power generation output of the rotating electrical machine while suppressing an increase in switching loss. it can.

FIG. 2 is a circuit diagram illustrating a configuration of a vehicle-mounted rotating electrical machine system. The figure which shows the transition of a power generation mode. The figure which shows control of the rotary electric machine according to rotation speed and torque. 9 is a chart showing a drive signal and a dead time during rectangular wave control. 4 is a chart showing an operation at the time of synchronous rectification control. 4 is a chart showing a drive signal and a dead time during synchronous rectification control.

  Hereinafter, an embodiment embodied as a rotating electric machine system mounted on a vehicle will be described with reference to the drawings.

  As shown in FIG. 1, the in-vehicle rotating electrical machine system 100 includes a rotating electrical machine unit 10, an engine ECU (Electronic Control Unit) 20, a battery 22 (corresponding to a power storage device), a second capacitor 23 (corresponding to a power storage device), and an electric load. 24 and the like. The rotating electric machine unit 10 includes a rotating electric machine 17, an inverter 13, a rotating electric machine ECU 14, and the like. The rotating electric machine unit 10 is a generator with a motor function, and is configured as an electromechanical integrated type ISG (Integrated Starter Generator). The rotating electric machine 17 includes X, Y, and Z-phase windings 11X, 11Y, and 11Z as three-phase armature windings, and a field winding 12. The battery 22 is, for example, a Pb battery that outputs a voltage of 12V. The battery 22 may be a battery different from the Pb battery that outputs 12 V, a battery that outputs a voltage other than 12 V, or the like.

  The X, Y, and Z phase windings 11X, 11Y, and 11Z are wound around a stator core (not shown) to form a stator. In the present embodiment, the first ends of the X, Y, and Z phase windings 11X, 11Y, and 11Z are connected at a neutral point. That is, the rotary electric machine unit 10 is Y-connected.

  The field winding 12 is wound around a field pole (not shown) arranged opposite to the inner peripheral side of the stator core to form a rotor. By supplying an exciting current to the field winding 12, the field pole is magnetized. An alternating voltage is output from each phase winding 11X, 11Y, 11Z by a rotating magnetic field generated when the field pole is magnetized. In this embodiment, the rotor obtains rotational power from the crankshaft of the vehicle-mounted engine 101 (the body of the vehicle-mounted engine is schematically shown in FIG. 1) and rotates. The engine 101 is, for example, an engine using gasoline as fuel, and generates a driving force by burning fuel. The engine 101 is not limited to a gasoline engine, and may be a diesel engine using light oil as fuel or an engine using other fuels.

  Inverter 13 (corresponding to a power conversion unit) converts an AC voltage (AC power) output from each phase winding 11X, 11Y, 11Z into a DC voltage (DC power). The inverter 13 converts a DC voltage supplied from the battery 22 into an AC voltage and outputs the AC voltage to each of the phase windings 11X, 11Y, and 11Z. The inverter 13 (corresponding to a rectifier circuit and a drive circuit) is a bridge circuit having the same number of upper and lower arms as the number of phases of the armature winding. Specifically, the inverter 13 includes an X-phase module 13X, a Y-phase module 13Y, and a Z-phase module 13Z, and forms a three-phase full-wave rectifier circuit. The inverter 13 constitutes a drive circuit that drives the rotating electric machine 17 by adjusting the AC voltage supplied to each phase winding 11X, 11Y, 11Z of the rotating electric machine 17.

  Each of the X, Y, and Z phase modules 13X, 13Y, and 13Z includes an upper arm switch Sp and a lower arm switch Sn. That is, the switches Sp and Sn are bridge-connected. In this embodiment, a voltage-controlled semiconductor switching element is used as each of the switches Sp and Sn, and specifically, an N-channel MOSFET is used. An upper arm diode Dp is connected in antiparallel (parallel) to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel (parallel) to the lower arm switch Sn. In the present embodiment, the body diodes of the switches Sp and Sn are used as the diodes Dp and Dn. The diodes Dp and Dn are not limited to the body diodes, and may be, for example, diodes of different parts from the switches Sp and Sn.

  The second terminal of the X-phase winding 11X is connected to the X terminal PX of the X-phase module 13X. The low potential side terminal (source) of the upper arm switch Sp and the high potential side terminal (drain) of the lower arm switch Sn are connected to the X terminal PX. The drain of the upper arm switch Sp is connected to the B terminal (corresponding to an output terminal) of the rotary electric machine unit 10, and the source of the lower arm switch Sn is connected to the ground portion (ground GND) via the E terminal of the rotary electric machine unit 10. ) Of the engine 101 are connected. The B terminal is a terminal connected to the positive electrode of the battery 22, and is formed in a detachable connector shape.

  The second end of the Y-phase winding 11Y is connected to the Y terminal PY of the Y-phase module 13Y. The connection point between the upper arm switch Sp and the lower arm switch Sn is connected to the Y terminal PY. The B terminal is connected to the drain of the upper arm switch Sp, and the body of the engine 101 as the ground GND is connected to the source of the lower arm switch Sn via the E terminal.

  The second terminal of the Z-phase winding 11Z is connected to the Z terminal PZ of the Z-phase module 13Z. A connection point between the upper arm switch Sp and the lower arm switch Sn is connected to the Z terminal PZ. The B terminal is connected to the drain of the upper arm switch Sp, and the body of the engine 101 as the ground GND is connected to the source of the lower arm switch Sn via the E terminal.

  A first capacitor 15 (corresponding to a power storage device) and a Zener diode 16 are connected in parallel to a series connection of the switches Sp and Sn constituting each of the phase modules 13X, 13Y and 13Z. A voltage sensor 41 (corresponding to a voltage detection unit and a voltage acquisition unit) that detects a voltage between the high-voltage connection point P1 and the low-voltage connection point P2 of the inverter 13 is provided.

  The rotating electric machine ECU 14 (corresponding to a control device) is configured as a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electric machine ECU 14 adjusts an exciting current flowing through the field winding 12 by an IC regulator (not shown) in the rotating electric machine ECU 14. Thereby, the generated voltage (voltage at the B terminal) of the rotating electrical machine unit 10 is controlled. Further, the rotating electrical machine ECU 14 controls the inverter 13 after the vehicle starts running to drive the rotating electrical machine 17 to assist the driving force of the engine 101. The rotating electric machine 17 can apply rotation to the crankshaft when the engine 101 starts, and also has a function as a starter. The rotary electric machine ECU 14 is connected to an engine ECU 20 as a control device outside the rotary electric machine unit 10 via an L terminal as a communication terminal and a communication line. The engine ECU 20 is configured as a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and controls the operating state of the engine 101. The rotating electrical machine ECU 14 performs two-way communication (for example, serial communication using a LIN protocol) with the engine ECU 20, and exchanges information with the engine ECU 20.

  The rotating electrical machine ECU 14 grasps a required torque (including a braking torque) required of the rotating electrical machine 17 based on the serial communication signal transmitted from the engine ECU 20. Then, the rotating electric machine ECU 14 controls the PWM voltage applied to the field winding 12 and the on / off states of the switches Sp and Sn so that the rotating electric machine 17 generates the required torque.

  The engine ECU 20 and the positive terminal of the battery 22 are connected to the B terminal via a relay 21. The body of the engine 101 as a ground GND is connected to a negative terminal of the battery 22. A second capacitor 23 and an electric load 24 are connected to the B terminal. The electric load 24 includes an electric load whose operating voltage is equal to or higher than a predetermined voltage, such as an electronic control brake system of a vehicle or an electric power steering. The operating voltage is a voltage at which the electric load can exhibit specified performance, such as a guaranteed voltage or a rated voltage of the electric load. The electric load 24 may include an air conditioner, in-vehicle audio, a headlamp, and the like. Note that the relay 21 is turned on by turning on the ignition switch.

  As shown in the transition of the power generation mode in FIG. 2, the rotating electrical machine ECU 14 performs rectangular wave control, synchronous rectification control, and diode (Di) rectification when the rotating electrical machine 17 generates power. The rotating electrical machine ECU 14 switches between the power generation mode and the power running mode based on the rotation speed of the rotating electrical machine 17 and the required torque (including the braking torque) required for the rotating electrical machine 17.

  Specifically, as shown in FIG. 3, the rotating electrical machine ECU 14 performs pulse width modulation control (PWM control) in power running and in a region A where the rotation speed is lower than the first rotation speed F1. In addition, the rotating electrical machine ECU 14 performs the rectangular wave control during power running and in a region B in which the rotation speed is equal to or higher than the first rotation speed F1. The first rotation speed F1 is set to a value that changes according to the required torque. The first rotation speed F1 may be a fixed value that does not depend on the required torque.

  During power running, the PWM control can increase the output torque of the rotating electric machine 17 as compared with the rectangular wave control, but when the rotating speed of the rotating electric machine 17 increases, the load in the control and the switching loss increase. Therefore, the PWM control is performed in the region A where the rotation speed is low, and the rectangular wave control is performed in the region B where the rotation speed is high.

  In addition, the rotating electrical machine ECU 14 performs the rectangular wave control at the time of power generation and in a region C in which the rotation speed is lower than the second rotation speed F2 (corresponding to a predetermined rotation speed). The rotating electrical machine ECU 14 performs the synchronous rectification control during power generation and in a region D where the rotating speed is equal to or more than the second rotating speed F2 and less than the third rotating speed F3 and the required torque is less than the predetermined negative torque T1 (F2 < F3). In addition, the rotating electrical machine ECU 14 performs diode rectification during power generation and in a region E where the rotation speed is equal to or higher than the second rotation speed F2 and the required torque is equal to or higher than the negative torque T1 or the rotation speed is equal to or higher than the third rotation speed F3. . The second rotation speed F2 and the third rotation speed F3 are fixed values that do not depend on the required torque. The second rotation speed F2 and the third rotation speed F3 may be set to values that change according to the required torque.

  FIG. 4 is a chart showing the drive signals of the switches Sp and Sn and the dead time DT1 in rectangular wave control during power generation. As shown in the figure, in the rectangular wave control at the time of power generation, the rotating electric machine ECU 14 (corresponding to a rectangular wave control unit) sets the switches Sp and Sn corresponding to each phase of the rotating electric machine 17 to a half cycle of one cycle R of the electrical angle. The switching is alternately switched on (H signal) and off (L signal), and the phase θ1 (timing t1) for turning on the upper arm switch Sp is controlled. The phases of each phase are shifted from each other by an electrical angle of 120 °. In addition, a dead time DT1 for turning off both the switches Sp and Sn is provided between a period in which the upper arm switch Sp is turned on and a period in which the lower arm switch Sn is turned on. Dead time DT1 is set to a predetermined fixed value. The phase θ1 is set based on the rotation speed of the rotating electric machine 17 and the required torque (or required power generation voltage).

  When the rectangular wave control is performed, the number of times of switching per electrical angle cycle is only one for each of the ON operation and the OFF operation. Compared with the case where the PWM control is performed, the number of times of switching per electrical angle cycle is reduced. Few. For this reason, the rotating electrical machine ECU 14 can reduce the number of times of switching compared to the PWM control and suppress the switching loss by performing the rectangular wave control.

  FIG. 5 is a chart showing the operation at the time of the synchronous rectification control, and FIG. 6 is a chart showing the drive signals of the switches Sp and Sn and the dead time DT2 at the time of the synchronous rectification control. As shown in FIGS. 5 and 6, in the synchronous rectification control at the time of power generation, the rotating electric machine ECU 14 (corresponding to a synchronous rectification control unit) causes the current to flow in synchronization with the periods Ta1 and Ta2 in which the current flows in the diodes Dp and Dn. The switches Sp and Sn connected in parallel to the diodes Dp and Dn are turned on. For example, the rotating electrical machine ECU 14 detects the current flowing in each phase, and turns on the corresponding switches Sp and Sn at the timing when it is detected that the current flows in each phase. Alternatively, the timing at which the current flows in each phase may be acquired in advance based on experiments or the like, and the corresponding switches Sp and Sn may be turned on at that timing. As shown in FIG. 6, a dead time DT2 in which the switches Sp and Sn are both off occurs between a period in which the upper arm switch Sp is turned on and a period in which the lower arm switch Sn is turned on. The dead time DT2 is a variable value determined according to the periods Ta1 and Ta2. Further, the phase θ2 (timing t2) at which the upper arm switch Sp is turned on changes according to the timing at which current flows in each phase.

  In the diode rectification, the rotary electric machine ECU 14 turns off all the switches Sp and Sn constituting the inverter 13 and performs rectification by the diodes Dp and Dn connected in parallel to the switches Sp and Sn. In FIG. 3, in a region where the generated power (the absolute value of the required torque) is small, the switching loss in the synchronous rectification control is larger than the diode loss in the diode rectification. For this reason, the rotary electric machine ECU 14 performs the synchronous rectification control in the region D where the generated power is large, and performs the diode rectification in the region E (rotational speed <F3) where the generated power is small. In the synchronous rectification control, when the rotation speed of the rotating electric machine 17 increases, the load in the control increases. Therefore, the rotating electric machine ECU 14 performs diode rectification in a region E (rotation speed ≧ F3) where the rotation speed of the rotating electric machine 17 is high. carry out.

  Here, when the voltage generated by the rotating electric machine 17 becomes lower than the voltage of the battery 22 (first capacitor 15) during the power generation by the synchronous rectification control, no current flows through the diodes Dp and Dn. For this reason, the electric power cannot be output from the rotating electric machine 17 in the power generation by the synchronous rectification control.

  On the other hand, in the present embodiment, the rotating electric machine ECU 14 (corresponding to the timing changing unit) sets the switches Sp and Sn in the synchronous rectification control when the current stops flowing through the diodes Dp and Dn during the power generation by the synchronous rectification control. The on / off timing of the switches Sp and Sn is changed so as to extend the on period.

  Specifically, when switching between the power generation by the synchronous rectification control and the power generation by the rectangular wave control, the rotating electrical machine ECU 14 determines the length of the period in which the switches Sp and Sn are turned on in the synchronous rectification control and the switches Sp and Sn in the rectangular wave control. The on / off timings of the switches Sp and Sn are changed so that the on-period is the same as the on-period. As a configuration for extending the period during which the switches Sp and Sn are turned on, a configuration for making the timing for turning on the switches Sp and Sn earlier, a configuration for delaying the timing for turning off the switches Sp and Sn, and both of them are performed. A configuration or the like can be adopted. The rotating electrical machine ECU 14 gradually changes the on / off timing of the switches Sp and Sn when extending the period in which the switches Sp and Sn are turned on in the synchronous rectification control. For example, the rotating electrical machine ECU 14 continuously changes the on / off timing of the switches Sp and Sn, or changes the on / off timing of the switches Sp and Sn stepwise.

  In power generation by rectangular wave control, the phase θ1 (timing t1) at which the upper arm switch Sp is turned on is controlled. In the power generation by the synchronous rectification control unit, the phase θ2 (timing t2) at which the upper arm switch Sp is turned on changes according to the timing at which current flows in each phase. Therefore, the phase θ1 in which the upper arm switch Sp (the lower arm switch Sn of another phase) is turned on in the power generation by the rectangular wave control, and the upper arm switch Sp (the lower arm switch in another phase) in the power generation by the synchronous rectification control. The phase θ2 at which Sn) is turned on is different.

  Therefore, when switching between the power generation by the synchronous rectification control and the power generation by the rectangular wave control unit, the rotating electrical machine ECU 14 sets the phase θ2 at which the upper arm switch Sp is turned on in the synchronous rectification control unit and the upper arm switch Sp in the rectangular wave control. The on / off timing of the upper arm switch Sp (lower arm switch Sn) is changed so as to be in phase with the phase θ1 to be turned on. When changing the phase for turning on the switches Sp and Sn, the rotating electrical machine ECU 14 gradually changes the on / off timing of the switches Sp and Sn.

  Further, when the rotating electrical machine ECU 14 shifts from the state where the on / off timing of the switches Sp and Sn is changed to the generation by the synchronous rectification control, the switches Sp and Sn are turned off so as to shorten the period for turning on the switches Sp and Sn. Change the on / off timing. As a configuration for shortening the period during which the switches Sp and Sn are turned on, a configuration for delaying the timing for turning on the switches Sp and Sn, a configuration for increasing the timing for turning off the switches Sp and Sn, and both of them are performed. A configuration or the like can be adopted. The rotating electrical machine ECU 14 gradually changes the on / off timing of the switches Sp and Sn when shortening the period in which the switches Sp and Sn are turned on.

  With this control, the rotating electrical machine ECU 14 switches the power generation output (torque, generated power) by the rotating electrical machine 17 so that the amount of change is smaller than a predetermined amount when switching between power generation by synchronous rectification control and power generation by rectangular wave control. The on / off timing of Sp and Sn is changed. Specifically, the rotating electrical machine ECU 14 calculates the on / off timings of the switches Sp and Sn at which the torque (that is, the generated power) output by the rotating electrical machine 17 becomes equal between the power generation by the synchronous rectification control and the power generation by the rectangular wave control. The rotating electrical machine ECU 14 sets the on / off timing of the switches Sp and Sn between the on / off timing of the switches Sp and Sn in the power generation by the synchronous rectification control and the on / off timing of the switches Sp and Sn in the power generation by the rectangular wave control. Change gradually.

  The embodiment described above has the following advantages.

  When the electric current stops flowing through the diodes Dp and Dn during the power generation by the synchronous rectification control, the rotating electric machine ECU 14 controls the switches Sp and Sn to extend the period Ta1 during which the switches Sp and Sn are turned on in the synchronous rectification control. Change the on / off timing. For this reason, electric power can be output from the rotating electric machine 17, and the power generation output of the rotating electric machine 17 can be increased. Moreover, since the number of times of switching the switches Sp and Sn does not increase, it is possible to suppress an increase in switching loss as compared with the case where PWM control is performed.

  -When shifting from the state where the on / off timing of the switches Sp and Sn is changed to the generation by the synchronous rectification control, the on / off timing of the switches Sp and Sn is changed so that the period in which the switches Sp and Sn are turned on is shortened. Is done. For this reason, it is possible to shift from the state in which the on / off timings of the switches Sp and Sn are changed to the generation by synchronous rectification control.

  When the period during which the switches Sp and Sn are turned on is extended or shortened by the rotating electrical machine ECU 14, the on / off timing of the switches Sp and Sn is gradually changed. For this reason, it is possible to suppress fluctuations in the torque applied by the rotating electric machine 17 and the output current and voltage.

  When switching between the power generation by the synchronous rectification control and the power generation by the rectangular wave control, the rotating electrical machine ECU 14 sets the length of the period Ta1 during which the switches Sp and Sn are turned on in the synchronous rectification control and the switches Sp and Sn to the ON state by the rectangular wave control. The on / off timings of the switches Sp and Sn are changed so that the on-period is equal to the length of the period (one half of one electrical angle period). Therefore, it is possible to switch between the power generation by the synchronous rectification control and the power generation by the rectangular wave control while maintaining the state of outputting the electric power from the rotating electric machine 17.

  When switching between the power generation by the synchronous rectification control and the power generation by the square wave control, the rotating electric machine ECU 14 turns on the phase θ2 in which the upper arm switch Sp is turned on in the synchronous rectification control and the upper arm switch Sp in the square wave control. The on / off timing of the switches Sp and Sn is changed so as to be in phase with the phase θ1. Therefore, when switching between the power generation by the synchronous rectification control and the power generation by the rectangular wave control, it is possible to suppress a sudden change in the phase in which the switches Sp and Sn are turned on. As a result, it is possible to suppress a sudden change in the torque applied by the rotating electric machine 17 and the output current and voltage.

  The rotating electrical machine ECU 14 changes the on / off timing of the switches Sp and Sn so that the amount of change in the power generation output by the rotating electrical machine 17 becomes smaller than a predetermined amount when switching between power generation by synchronous rectification control and power generation by rectangular wave control. . Therefore, when switching between the power generation by the synchronous rectification control and the power generation by the rectangular wave control, it is possible to suppress generation of noise and vibration in the rotating electric machine 17.

  In the rotating electrical machine unit 10 including the rotating electrical machine ECU 14, the rotating electrical machine 17, and the inverter 13, the power generation output of the rotating electrical machine 17 can be increased while suppressing an increase in switching loss.

The above embodiment can be modified and implemented as follows.
The rotating electric machine ECU 14 controls the switch Sp in the synchronous rectification control not only when the current does not flow through the diodes Dp and Dn but also when the current flowing through the diodes Dp and Dn becomes smaller than a predetermined current during power generation by the synchronous rectification control. , Sn may be changed so as to extend the period Ta1 during which the switches Sp, Sn are turned on. As the predetermined current, for example, a current in which the power generation efficiency of the rotating electrical machine 17 is lower than the predetermined efficiency although the current flows through the diodes Dp and Dn can be adopted. According to such a configuration, the power output from the rotating electric machine 17 can be increased, the power generation output of the rotating electric machine 17 can be increased, and the power generation efficiency of the rotating electric machine 17 can be improved.

  -Instead of the battery 22, an electric double layer capacitor or a lithium ion capacitor can be adopted.

  The functions of the rectangular wave control unit, the synchronous rectification control unit, and the timing change unit can be realized by the engine ECU 20 instead of the rotating electric machine ECU 14.

  The rotating electric machine having a multi-phase multiplex winding can be used as the rotating electric machine 17. As the rotating electric machine 17, a rotor having a magnet provided in the rotor 58 may be used instead of the field winding 12. In that case, the control of the inverter 13 may be changed according to the configuration of the rotating electric machine 17. In addition, the configuration of the inverter 13 may be such that the entire X, Y, Z phase modules 13X, 13Y, 13Z are configured as an integrated module, or two of the X, Y, Z phase modules 13X, 13Y, 13Z are integrated modules. It may be constituted as. Further, as the rotating electric machine 17, an MG (Motor Generator) for generating a driving force capable of driving a vehicle, or an alternator (generator) may be employed.

  13 inverter, 14 rotating electric machine ECU, 15 ... first condenser, 17 ... rotating electric machine, 20 ... engine ECU, 22 ... battery, 23 ... second capacitor, Dn ... lower arm diode, Dp ... upper arm diode, Sn ... Lower arm switch, Sp ... upper arm switch.

Claims (14)

A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electrical machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
During power generation by the synchronous rectification control unit, when the current in the diode does not flow to change the on-off timing of the switching element so as to extend the period of the switching element by the synchronous rectification control unit is turned on A timing change unit,
Equipped with a,
The control device for a rotating electric machine, wherein the timing changing unit gradually changes the on / off timing of the switching element when extending a period in which the switching element is turned on by the synchronous rectification control unit . A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electric machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
At the time of power generation by the synchronous rectification control unit, the switching element is turned on by the synchronous rectification control unit when the current flowing through the diode is smaller than a predetermined current at which the power generation efficiency of the rotating electric machine is lower than a predetermined efficiency. A timing changing unit that changes the on / off timing of the switching element so as to extend a period to be performed,
With
The control device for a rotating electric machine, wherein the timing changing unit gradually changes an on / off timing of the switching element when extending a period in which the switching element is turned on by the synchronous rectification control unit.   The timing change unit is configured to change the on / off timing of the switching element so as to shorten a period in which the switching element is turned on when shifting from the state where the on / off timing of the switching element is changed to the power generation by the synchronous rectification control unit. The control device for a rotating electric machine according to claim 1, wherein the controller is changed. A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electric machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
A timing change that changes the on / off timing of the switching element so as to extend the period in which the switching element is turned on by the synchronous rectification control part when the current stops flowing through the diode during power generation by the synchronous rectification control unit. Department and
With
The timing change unit is configured to change the on / off timing of the switching element so as to shorten a period in which the switching element is turned on when shifting from the state where the on / off timing of the switching element is changed to the power generation by the synchronous rectification control unit. To change the rotating electric machine control device. A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electric machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
At the time of power generation by the synchronous rectification control unit, the switching element is turned on by the synchronous rectification control unit when the current flowing through the diode is smaller than a predetermined current at which the power generation efficiency of the rotating electric machine is lower than a predetermined efficiency. A timing changing unit that changes the on / off timing of the switching element so as to extend a period to be performed,
With
The timing change unit is configured to change the on / off timing of the switching element so as to shorten a period in which the switching element is turned on when shifting from the state where the on / off timing of the switching element is changed to the power generation by the synchronous rectification control unit. To change the rotating electric machine control device. The control device for a rotary electric machine according to any one of claims 3 to 5, wherein the timing changing unit gradually changes the on / off timing of the switching element when shortening a period during which the switching element is turned on. When the rotating electric machine generates electric power, the switching elements corresponding to each phase of the rotating electric machine are alternately turned on and off by half a cycle of one electrical angle, and a phase for controlling the phase of turning on the switching element is controlled. A wave control unit (14, 20);
The timing change unit is configured such that when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit, the length of a period during which the switching element is turned on by the synchronous rectification control unit and the rectangular wave control unit The control of the rotating electric machine according to any one of claims 1 to 6 , wherein the on / off timing of the switching element is changed so that the on-time of the switching element becomes an on-period between the on-period and the on-period of the switching element. apparatus. A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electrical machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
A timing change that changes the on / off timing of the switching element so as to extend the period in which the switching element is turned on by the synchronous rectification control part when the current stops flowing through the diode during power generation by the synchronous rectification control unit. Department and
When the rotating electric machine generates electric power, the switching elements corresponding to each phase of the rotating electric machine are alternately turned on and off by half a cycle of one electrical angle, and a phase for controlling the phase of turning on the switching element is controlled. A wave control unit (14, 20);
With
The timing changing unit is configured such that when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit, the length of a period during which the switching element is turned on by the synchronous rectification control unit and the rectangular wave control unit A control device for a rotating electrical machine, wherein the on / off timing of the switching element is changed so that the on-period of the switching element has an on-period between the on-period and the on-period of the switching element. A rotating electric machine (17) having a power generation function, power storage devices (15, 22, 23), bridge-connected switching elements (Sp, Sn), and diodes (Dp, Dn) respectively connected in parallel to the switching elements. A control unit (14, 20) applied to a vehicle having a power conversion unit (13) for performing power conversion between the rotating electric machine and the power storage device, the control unit controlling the rotating electric machine. ,
At the time of power generation by the rotating electric machine, a synchronous rectification control unit that turns on the switching element connected in parallel to the diode in which current flows, in synchronization with a period in which current flows in the diode,
At the time of power generation by the synchronous rectification control unit, the switching element is turned on by the synchronous rectification control unit when the current flowing through the diode is smaller than a predetermined current at which the power generation efficiency of the rotating electric machine is lower than a predetermined efficiency. A timing changing unit that changes the on / off timing of the switching element so as to extend a period to be performed,
When the rotating electric machine generates electric power, the switching elements corresponding to each phase of the rotating electric machine are alternately turned on and off by half a cycle of one electrical angle, and a phase for controlling the phase of turning on the switching element is controlled. A wave control unit (14, 20);
With
The timing changing unit is configured such that when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit, the length of a period during which the switching element is turned on by the synchronous rectification control unit and the rectangular wave control unit A control device for a rotating electrical machine, wherein the on / off timing of the switching element is changed so that the on-period of the switching element has an on-period between the on-period and the on-period of the switching element. The timing change unit is configured to switch between the phase in which the switching element is turned on by the synchronous rectification control unit and the switching by the rectangular wave control unit when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit. The control device for a rotating electric machine according to any one of claims 7 to 9 , wherein the on / off timing of the switching element is changed so as to be in a phase between the phase in which the element is turned on. The control device for a rotating electric machine according to claim 10 , wherein the timing changing unit gradually changes the on / off timing of the switching element when changing the phase at which the switching element is turned on. The timing changing unit is configured to switch on / off timing of the switching element such that a change in a power generation output by the rotating electric machine becomes smaller than a predetermined amount when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit. The control device for a rotating electrical machine according to any one of claims 7 to 11 , wherein: When the rotating speed of the rotating electrical machine is lower than a predetermined rotating speed, the rectangular wave control unit causes the switching element corresponding to each phase of the rotating electrical machine to generate a half cycle of one electrical angle cycle during power generation by the rotating electrical machine. While turning on and off alternately each time, controlling the phase of turning on the switching element,
When the rotating speed of the rotating electric machine is higher than the predetermined rotating speed, the synchronous rectification control unit is connected in parallel to a diode in which current flows, in synchronization with a period in which current flows in the diode during power generation by the rotating electric machine. The control device for a rotating electric machine according to any one of claims 7 to 12 , wherein the switching element is turned on. A control device (14) for a rotating electric machine according to any one of claims 1 to 13 ,
A rotating electric machine unit (10) including the rotating electric machine (17) and the power converter (13).

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