WO2018097013A1

WO2018097013A1 - Control device for rotary electric machine, and rotary electric machine unit

Info

Publication number: WO2018097013A1
Application number: PCT/JP2017/041157
Authority: WO
Inventors: 中山　英明
Original assignee: 株式会社デンソー
Priority date: 2016-11-28
Filing date: 2017-11-15
Publication date: 2018-05-31
Also published as: JP6645405B2; JP2018088734A; DE112017006017T5

Abstract

A control device (14, 20) for a rotary electric machine, said control device being applied to a vehicle equipped with: a rotary electric machine (17) having a power generation function; power storage devices (15, 22, 23); and power conversion units (13) that perform a power conversion between the rotary electric machine and the power storage devices, and have bridge-connected switching elements (Sp, Sn) and diodes (Dp, Dn) respectively connected in parallel to the switching elements. The control device for a rotary electric machine is equipped with: a synchronous rectification control unit which, when power is generated by the rotary electric machine, and in synchronization with the period in which current is flowing in a diode, turns on the switching element that is connected in parallel to the diode in which current is flowing; and a timing changing unit which, when power is generated by the synchronous rectification control unit and the current flowing in a diode is smaller than a prescribed current, changes the on/off timing of the switching element so as to lengthen the period in which the switching element is turned on by the synchronous rectification control unit.

Description

Rotating electrical machine control device, rotating electrical machine unit

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2016-230062 filed on November 28, 2016, the contents of which are incorporated herein by reference.

The present disclosure relates to a control device that controls a rotating electrical machine.

Conventionally, there is one that switches a power generation mode by a rotating electric machine when the rotating speed of the rotating electric machine is equal to or lower than a predetermined value and when the rotating speed exceeds a predetermined value (see Patent Document 1). In the device disclosed in Patent Document 1, when the rotational speed of the rotating electrical 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 to control the PWM controlled current to the armature coil. Electricity is generated and power is generated by PWM control. When the rotational speed of the rotating electrical machine exceeds a predetermined value, power generation is performed by controlling the field current flowing in the field coil without performing PWM control.

JP 2016-189698 A

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

The present disclosure has been made in order to solve the above-described problems, and a main object of the present disclosure is to provide a control device for a rotating electrical machine capable of increasing the power generation output of the rotating electrical machine while suppressing an increase in switching loss. It is to provide.

The first means for solving the above problems is as follows.
A rotating electrical machine having a power generation function, a power storage device, a bridge-connected switching element, and a diode connected in parallel to each of the switching elements, and performing power conversion between the rotating electrical machine and the power storage device A control unit that is applied to a vehicle including a conversion unit and controls the rotating electrical machine,
A synchronous rectification control unit that turns on the switching element connected in parallel to the diode through which the current flows, in synchronization with a period in which the current flows through the diode during power generation by the rotating electrical machine;
When the current flowing through the diode is smaller than a predetermined current during power generation by the synchronous rectification control unit, the on / off timing of the switching element is extended so that the period during which the switching element is turned on by the synchronous rectification control unit is extended. A timing changing section for changing
Is provided.

According to the above configuration, the power conversion unit includes the bridge-connected switching element and the diode connected in parallel to the switching element, and performs power conversion between the rotating electrical machine and the power storage device. Then, during power generation by the rotating electrical machine, the synchronous rectification control unit turns on the switching element connected in parallel to the diode through which the current flows in synchronization with the period during which the current flows through the diode. For this reason, the power storage device can be efficiently charged with the electric power output from the rotating electrical machine.

Here, when the voltage generated by the rotating electrical machine becomes lower than the voltage of the power storage device during power generation by the synchronous rectification control unit, no current flows through the diode. For this reason, in the power generation by the synchronous rectification control unit, it becomes impossible to output electric power from the rotating electrical machine. In this regard, the timing changing unit is configured to extend a period during which 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 during power generation by the synchronous rectification control unit. Change the on / off timing. For this reason, it becomes possible to output electric power from the rotating electrical machine or increase the output electric power, thereby increasing the power generation output of the rotating electrical machine. And since the frequency | count of switching a switching element does not increase, it can suppress that a switching loss increases compared with the case where PWM control is performed. In particular, a case where the diode current stops flowing may be employed as a case where the current flowing through the diode becomes smaller than a predetermined current.

Note that the configuration in which the period during which the switching element is turned on is extended includes a configuration in which the switching element is turned on earlier, a timing in which the switching element is turned off later, and a configuration in which both are performed. .

In the second means, the timing changing unit 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 unit.

According to the above configuration, when extending the period during which the switching element is turned on, the on / off timing of the switching element is gradually changed. For this reason, it can suppress that the torque which acts by a rotary electric machine, and the output electric current and voltage change.

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

In a state where power generation is performed 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 switching from the state in which the on / off timing of the switching element is changed to the power generation by the synchronous rectification control unit, the switching element is turned on / off so that the period during which the switching element is turned on is shortened. Timing is changed. For this reason, it can be made to shift to the power generation by a synchronous rectification control part from the state where the on-off timing of the switching element was changed.

In the fourth means, the timing changing unit gradually changes the on / off timing of the switching element when shortening the period during which the switching element is turned on.

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 can suppress that the torque which acts by a rotary electric machine, and the output electric current and voltage change.

In the fifth means, during the power generation by the rotating electrical machine, the switching elements corresponding to each phase of the rotating electrical machine are alternately switched on and off by half a cycle of one electrical angle, and the switching element is turned on. A rectangular wave control unit that controls a phase to be transmitted, and the timing changing unit turns on the switching element 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 as to be an on period having a length between a length of a period during which the switching element is turned on by the rectangular wave control unit.

According to the above configuration, at the time of power generation by the rotating electrical machine, the rectangular wave control unit switches the switching element corresponding to each phase of the rotating electrical machine alternately on and off by half a cycle of one electrical angle, and the switching element. The phase at which is turned on is controlled. For this reason, it is possible to generate electric power by the rotating electrical machine while suppressing the switching loss as compared with the case where PWM control is performed.

Here, the timing changing unit is configured to switch the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit. The on / off timing of the switching element is changed so as to be an on period having a length between the on period and the on period. For this reason, 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 a state in which electric power is output from the rotating electrical 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 at which the switching element is turned on in power generation by the rectangular wave control unit is different from the phase at which the switching element is turned on in power generation by the synchronous rectification control unit.

In this regard, in the sixth means, the timing changing unit is configured to turn on the switching element 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. And a configuration in which 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. For this reason, when switching between power generation by the synchronous rectification control unit and power generation by the rectangular wave control unit, it is possible to suppress a sudden change in the phase at which the switching element is turned on. As a result, it is possible to suppress a sudden change in the torque acting on the rotating electrical machine and the output current and voltage.

In the seventh means, 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.

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 can suppress that the torque which acts by a rotary electric machine, and the output electric current and voltage change.

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

In this regard, in the eighth means, the timing changing unit is configured such that when the power generation by the synchronous rectification control unit and the power generation by the rectangular wave control unit are switched, the amount of change in the power generation output by the rotating electrical machine is smaller than a predetermined amount. Thus, a configuration is adopted in which the on / off timing of the switching element is changed. For this reason, 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 the generation of noise and vibration in the rotating electrical machine.

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

The tenth means is a rotating electrical machine unit and includes a rotating electrical machine control device of any one of the first to ninth means, the rotating electrical machine, and the power conversion unit.

According to the above configuration, in the rotating electrical machine unit including the control device for the rotating electrical machine, 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.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is a circuit diagram showing a configuration of an in-vehicle rotating electrical machine system, FIG. 2 is a diagram showing the transition of the power generation mode, FIG. 3 is a diagram showing the control of the rotating electrical machine according to the rotational speed and torque, FIG. 4 is a chart showing drive signals and dead time during rectangular wave control. FIG. 5 is a chart showing the operation during synchronous rectification control, FIG. 6 is a chart showing drive signals and dead time during synchronous rectification control.

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

As shown in FIG. 1, an 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), an electric load. 24 etc. The rotating electrical machine unit 10 includes a rotating electrical machine 17, an inverter 13, a rotating electrical machine ECU 14, and the like. The rotating electrical machine unit 10 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). The rotating electrical machine 17 includes X, Y and

Z phase windings

11X, 11Y, 11Z as a three-phase armature winding, and a field winding 12. The battery 22 is a Pb battery that outputs a voltage of 12 V, for example. In addition, as the battery 22, a battery that outputs 12V using a different type of battery from the Pb battery, a battery that outputs a voltage other than 12V, and the like can be used.

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 rotating electrical machine unit 10 is Y-connected.

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

The inverter 13 (corresponding to a power converter) converts the AC voltage (AC power) output from each phase winding 11X, 11Y, 11Z into a DC voltage (DC power). The inverter 13 converts the DC voltage supplied from the battery 22 into an AC voltage and outputs the AC voltage to the

phase windings

11X, 11Y, and 11Z. The inverter 13 (corresponding to a rectifier circuit and a drive circuit) is a bridge circuit having upper and lower arms of the same number 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 constitutes a three-phase full-wave rectifier circuit. The inverter 13 constitutes a drive circuit that drives the rotating electrical machine 17 by adjusting the AC voltage supplied to the

phase windings

11X, 11Y, 11Z of the rotating electrical 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 the present embodiment, voltage controlled semiconductor switching elements are used as the switches Sp and Sn, and specifically, N-channel MOSFETs are 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 body diodes, and may be diodes that are separate parts from the switches Sp and Sn, for example.

The second end of the X-phase winding 11X is connected to the X terminal PX of the X-phase module 13X. The X terminal PX is connected to 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. A B terminal (corresponding to an output terminal) of the rotating electrical machine unit 10 is connected to the drain of the upper arm switch Sp, and a grounding part (ground GND) is connected to the source of the lower arm switch Sn via the E terminal of the rotating electrical machine unit 10. ) As the body of the engine 101 is 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. A 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 end 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 body of the switches Sp and Sn constituting 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 side connection point P1 and the low-voltage side connection point P2 of the inverter 13 is provided.

The rotating electrical 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 electrical machine ECU 14 adjusts the excitation current flowing through the field winding 12 by an IC regulator (not shown) inside. Thereby, the power generation voltage (voltage of the B terminal) of the rotating electrical machine unit 10 is controlled. The rotating electrical machine ECU 14 assists the driving force of the engine 101 by controlling the inverter 13 to drive the rotating electrical machine 17 after the vehicle starts to travel. The rotating electrical machine 17 can impart rotation to the crankshaft when the engine 101 is started, and also has a function as a starter. The rotating electrical machine ECU 14 is connected to an engine ECU 20 that is a control device outside the rotating electrical machine unit 10 via an L terminal that is 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 the like, and controls the operating state of the engine 101. The rotating electrical machine ECU 14 performs bidirectional communication (for example, serial communication using the LIN protocol) with the engine ECU 20 and exchanges information with the engine ECU 20.

The rotating electrical machine ECU 14 grasps the required torque (including braking torque) requested from the rotating electrical machine 17 based on the serial communication signal transmitted from the engine ECU 20. The rotating electrical 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 electrical 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 the relay 21. The body of the engine 101 as the ground GND is connected to the negative terminal of the battery 22. A second capacitor 23 and an electrical load 24 are connected to the B terminal. The electric load 24 includes an electric load whose operating voltage is a predetermined voltage or higher, such as an electronically controlled brake system of a vehicle or an electric power steering. The operating voltage is a voltage at which the electrical load can exhibit the specified performance, such as a guaranteed voltage or a rated voltage of the electrical load. The electrical load 24 may include an air conditioner, in-vehicle audio, a headlamp, and the like. The relay 21 is turned on by turning on the ignition switch.

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 rotational speed of the rotating electrical machine 17 and the required torque (including 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 a region A where the rotational speed is less than the first rotational speed F1 during power running. Further, the rotating electrical machine ECU 14 performs the rectangular wave control in the region B where the rotational speed is equal to or higher than the first rotational speed F1 during power running. 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 electrical machine 17 compared to the rectangular wave control, while the load and switching loss in the control increase as the rotational speed of the rotating electrical machine 17 increases. Therefore, PWM control is performed in the region A where the rotational speed is low, and rectangular wave control is performed in the region B where the rotational speed is high.

Further, the rotating electrical machine ECU 14 performs the rectangular wave control in the region C where the rotational speed is less than the second rotational speed F2 (corresponding to a predetermined rotational speed) during power generation. The rotating electrical machine ECU 14 performs synchronous rectification control in a region D where power is generated, the rotational speed is equal to or higher than the second rotational speed F2 and lower than the third rotational speed F3, and the required torque is lower than a predetermined negative torque T1 (F2 < F3). In addition, the rotating electrical machine ECU 14 performs diode rectification at the time of power generation, in a region E where the rotational speed is equal to or higher than the second rotational speed F2 and the required torque is negative torque T1 or higher, or the rotational speed is equal to or higher than the third rotational 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 drive signals and dead time DT1 of the switches Sp and Sn in rectangular wave control during power generation. As shown in the figure, in the rectangular wave control during power generation, the rotating electrical machine ECU 14 (corresponding to the rectangular wave control unit) switches the switches Sp and Sn corresponding to each phase of the rotating electrical machine 17 to a half cycle of one electrical angle R. While alternately switching on (H signal) and off (L signal) one by one, the phase θ1 (timing t1) for turning on the upper arm switch Sp is controlled. The phases of the phases are shifted from each other by an electrical angle of 120 °. Further, a dead time DT1 for turning off both the switches Sp and Sn is provided between the period for turning on the upper arm switch Sp and the period for turning on the lower arm switch Sn. The dead time DT1 is set to a predetermined fixed value. The phase θ1 is set based on the rotation speed of the rotating electrical 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 once for the ON operation and the OFF operation, and the number of switching times per cycle of the electrical angle is smaller than when PWM control is performed. Few. For this reason, the rotating electrical machine ECU 14 can reduce the number of times of switching and suppress the switching loss by performing the rectangular wave control as compared with the PWM control.

FIG. 5 is a chart showing the operation at the time of synchronous rectification control, and FIG. 6 is a chart showing the drive signals and dead time DT2 of the switches Sp and Sn at the time of synchronous rectification control. As shown in FIGS. 5 and 6, in the synchronous rectification control during power generation, the rotating electrical machine ECU 14 (corresponding to the synchronous rectification control unit) flows in synchronization with the periods Ta1 and Ta2 in which 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 a current flowing in each phase, and turns on the corresponding switches Sp and Sn at a timing when the current is detected to flow in each phase. Alternatively, the timing at which 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 both the switches Sp and Sn are off occurs between the period in which the upper arm switch Sp is turned on and the 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. In addition, the phase θ2 (timing t2) at which the upper arm switch Sp is turned on changes in accordance with the timing at which current flows in each phase.

In the diode rectification, the rotating electrical 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 the region where the generated power (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 rotating electrical machine ECU 14 performs synchronous rectification control in the region D where the generated power is large, and performs diode rectification in the region E where the generated power is small (rotational speed <F3). In the synchronous rectification control, the load in the control increases as the rotational speed of the rotating electrical machine 17 increases. Therefore, the rotating electrical machine ECU 14 performs diode rectification in the region E where the rotational speed of the rotating electrical machine 17 is high (rotational speed ≧ F3). carry out.

Here, when the voltage generated by the rotating electrical machine 17 is 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, in the power generation by the synchronous rectification control, it becomes impossible to output electric power from the rotating electrical machine 17.

On the other hand, in the present embodiment, the rotating electrical machine ECU 14 (corresponding to the timing changing unit) switches the switches Sp and Sn in the synchronous rectification control when no current flows through the diodes Dp and Dn during power generation by the synchronous rectification control. The on / off timing of the switches Sp and Sn is changed so as to extend the period during which the switch is turned on.

Specifically, the rotary electric machine ECU 14 switches between the power generation by the synchronous rectification control and the power generation by the rectangular wave control, the length of the period during 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 has a length between the on period and the on period. As a configuration for extending the period during which the switches Sp and Sn are turned on, a configuration in which the timing to turn on the switches Sp and Sn is advanced, a configuration in which the timing to turn off the switches Sp and Sn is delayed, 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 timings of the switches Sp and Sn when extending the period during 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 timings of the switches Sp and Sn, or changes the on / off timings of the switches Sp and Sn in stages.

In the power generation by the rectangular wave control, the phase θ1 (timing t1) at which the upper arm switch Sp is turned on is controlled. Further, 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 of current flowing in each phase. Therefore, the phase θ1 in which the upper arm switch Sp (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 (lower arm switch of another phase in the power generation by the synchronous rectification control). The phase θ2 at which Sn) is turned on will be different.

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

In addition, when the rotating electrical machine ECU 14 shifts from the state in which the on / off timing of the switches Sp and Sn is changed to the power generation by the synchronous rectification control, the rotating electrical machine ECU 14 shortens the period during which the switches Sp and Sn are turned on. 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 timings of the switches Sp and Sn when the period during which the switches Sp and Sn are turned on is shortened.

By such control, the rotating electrical machine ECU 14 switches the power generation output (torque, generated power) change amount by the rotating electrical machine 17 to be 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 from the rotating electrical machine 17 is 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, Sn between the on / off timing of the switches Sp, Sn in the power generation by the synchronous rectification control and the on / off timing of the switches Sp, Sn in the power generation by the rectangular wave control. Change gradually.

The embodiment described above has the following advantages.

The rotating electrical machine ECU 14 sets 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 when no current flows through the diodes Dp and Dn during power generation by the synchronous rectification control. Change the on / off timing. For this reason, it becomes possible to output electric power from the rotating electrical machine 17 and increase the power generation output of the rotating electrical machine 17. In addition, since the number of times the switches Sp and Sn are switched does not increase, an increase in switching loss can be suppressed as compared with the case where PWM control is performed.

-When the switch Sp, Sn on / off timing is changed to the power generation by the synchronous rectification control, the switch Sp, Sn on / off timing is changed so that the period during which the switches Sp, Sn are turned on is shortened. Is done. For this reason, it can transfer to the electric power generation by synchronous rectification control from the state in which the on-off timing of switches Sp and Sn was changed.

When the period during which the switches Sp and Sn are turned on is extended and 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 can suppress that the torque which acts with the rotary electric machine 17, and the electric current and voltage which are output change.

-When the rotating electrical machine ECU 14 switches between power generation by synchronous rectification control and power generation by rectangular wave control, the switches Sp and Sn are turned on by the length of the period Ta1 during which the switches Sp and Sn are turned on in the synchronous rectification control and the rectangular wave control. The on / off timings of the switches Sp and Sn are changed so as to be an on period having a length between the period (a half period of one electrical angle) of the period of time. For this reason, 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 in which the electric power is output from the rotating electrical machine 17.

In the rotating electrical machine ECU 14, when switching between power generation by the synchronous rectification control and power generation by the rectangular wave control, the upper arm switch Sp is turned on in the phase θ2 in which the upper arm switch Sp is turned on in the synchronous rectification control and the rectangular wave control. The on / off timings of the switches Sp and Sn are changed so that the phase is between the phase θ1 and the phase θ1. For this reason, at the time of 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 at which the switches Sp and Sn are turned on. As a result, it is possible to suppress sudden changes in the torque applied by the rotating electrical 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 is smaller than a predetermined amount when switching between power generation by synchronous rectification control and power generation by rectangular wave control. . For this reason, at the time of switching between power generation by synchronous rectification control and power generation by rectangular wave control, it is possible to suppress the occurrence of noise and vibration in the rotating electrical 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.

It should be noted that the above embodiment can be modified as follows.

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

· An electric double layer capacitor or a lithium ion capacitor may be employed instead of the battery 22.

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

-As the rotating electrical machine 17, a rotating electrical machine having a multi-phase multiple winding can be adopted. As the rotating electrical machine 17, a rotor 58 having a magnet may be employed 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 electrical machine 17. The configuration of the inverter 13 is also configured such that the entire X, Y,

Z phase modules

13X, 13Y, 13Z are integrated modules, or two of the X, Y,

Z phase modules

13X, 13Y, 13Z are integrated modules. Or may be configured as Further, as the rotating electrical machine 17, an MG (Motor Generator) that generates a driving force capable of driving the vehicle or an alternator (generator) can be adopted.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A rotating electrical machine (17) having a power generation function, a power storage device (15, 22, 23), switching elements (Sp, Sn) connected in a bridge, and diodes (Dp, Dn) connected in parallel to the switching elements, And a control device (14, 20) that controls the rotating electrical machine, and is applied to a vehicle including a power conversion unit (13) that performs power conversion between the rotating electrical machine and the power storage device. ,
A synchronous rectification control unit that turns on the switching element connected in parallel to the diode through which the current flows, in synchronization with a period in which the current flows through the diode during power generation by the rotating electrical machine;
When the current flowing through the diode is smaller than a predetermined current during power generation by the synchronous rectification control unit, the on / off timing of the switching element is extended so that the period during which the switching element is turned on by the synchronous rectification control unit is extended. A timing changing section for changing
A control device for a rotating electrical machine.
The control device for a rotating electrical machine according to claim 1, wherein the timing changing unit gradually changes the on / off timing of the switching element when extending a period during which the switching element is turned on by the synchronous rectification control unit.
The timing changing unit is configured to reduce an on / off timing of the switching element so as to shorten a period during which the switching element is turned on when the on / off timing of the switching element is changed to power generation by the synchronous rectification control unit. The control apparatus of the rotary electric machine according to claim 1 or 2, wherein
4. The control device for a rotating electrical machine according to claim 3, wherein the timing changing unit gradually changes the on / off timing of the switching element when the period during which the switching element is turned on is shortened.
A rectangle for switching the switching element corresponding to each phase of the rotating electrical machine alternately on and off for each half cycle of an electrical angle and controlling the phase at which the switching element is turned on during power generation by the rotating electrical machine A wave control unit (14, 20),
The timing changing unit is configured to change a period of time during which the switching element is turned on by the synchronous rectification control unit and 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 of the rotating electrical machine according to any one of claims 1 to 4, wherein the on / off timing of the switching element is changed so as to be an on period having a length between a period of time during which the switching element is turned on. apparatus.
The timing changing unit is configured to switch a phase of turning on the switching element 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 electrical machine according to claim 5, wherein the on / off timing of the switching element is changed so as to be in a phase between the phase where the element is turned on.
The control device for a rotating electrical machine according to claim 6, wherein the timing changing unit gradually changes an on / off timing of the switching element when changing a phase at which the switching element is turned on.
The timing changing unit is configured to turn on and off the switching element so that the amount of change in power generation output by the rotating electrical machine is 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 rotating electrical machine control device according to any one of claims 5 to 7, wherein the controller is changed.
When the rotational speed of the rotating electrical machine is lower than a predetermined rotational speed, the rectangular wave control unit causes the switching element corresponding to each phase of the rotating electrical machine to have a half cycle of an electrical angle during power generation by the rotating electrical machine. Alternately turning on and off at a time, and controlling the phase at which the switching element is turned on,
The synchronous rectification control unit is connected in parallel to a diode through which a current flows in synchronization with a period during which a current flows through the diode during power generation by the rotating electrical machine when the rotational speed of the rotating electrical machine is higher than the predetermined rotation speed. The control device for a rotating electrical machine according to any one of claims 5 to 8, wherein the switched switching element is turned on.
A control device (14) for a rotating electrical machine according to any one of claims 1 to 9,
A rotating electrical machine unit (10) comprising the rotating electrical machine (17) and the power converter (13).