JP6708165B2 - Controller for rotating electrical machine - Google Patents

Description

The present invention relates to a control device that controls a rotating electrical machine device having a power generation function.

The rotary electric machine device having a power generation function supplies electric power to various electric loads and batteries via a wiring connected to an output terminal. If the wiring is disconnected from the output terminal or the battery terminal during power generation by the rotating electrical machine device, a transient high voltage called load dump is generated. When such a load dump voltage is generated, load dump protection control is performed in order to protect the electric load and the elements in the rotary electric machine device.

For example, in Patent Document 1, an H-bridge circuit composed of two MOS transistors and two diodes is connected to a field winding, and a three-phase bridge circuit is connected to a stator winding. The following controls are performed. That is, the control device described in Patent Document 1 stops the supply of the excitation current to the field winding and controls all the MOS transistors in the lower arm (low side) of the three-phase bridge circuit to be turned on. At this time, all the MOS transistors in the upper arm (high side) are controlled to be off.

JP, 2005-80319, A

By the way, when all the MOS transistors in the lower arm of the three-phase bridge circuit are controlled to be turned on, it is necessary to prevent the upper arm and the lower arm from being short-circuited. Therefore, it is necessary to turn on the MOS transistor of the lower arm at least after turning off the MOS transistor of the upper arm. Further, when the H-bridge circuit is composed of four MOS transistors, it is necessary to perform the same control when controlling all the MOS transistors in the lower arm to be turned on.

Here, Patent Document 1 does not consider in what order the MOS transistors of the H-bridge circuit and the MOS transistors of the three-phase bridge circuit should be controlled. Therefore, the control device described in Patent Document 1 still leaves room for improvement in suppressing the peak value of the load dump voltage.

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 rotary electric machine device capable of suppressing a peak value of a load dump voltage.

The first means for solving the above problems is
A field winding that magnetizes the field pole,
An armature winding that generates an AC voltage by the magnetic field generated by the field pole,
A plurality of phases including a switching element for the upper arm and a switching element for the lower arm connected in series, and a power conversion circuit for converting an AC voltage generated in the armature winding into a DC voltage,
An H-bridge circuit having two upper arm switching elements and two lower arm switching elements and supplying an exciting current to the field winding,
A voltage detection unit that detects the voltage of the output terminal of the power conversion circuit,
A control device applied to a rotating electrical machine device comprising:
When the voltage detected by the voltage detection unit is higher than a threshold value, of all switching elements of the power conversion circuit, a first element group that is a switching element of all upper arms or a switching element of all lower arms. A first control unit for controlling a switching element including a switch to off,
Of the switching elements of the power conversion circuit, after the control is started after the control by the first control unit is finished, and the first element group is actually turned off and maintained, A second controller for actually turning on the second element group, which is all the switching elements of the arm opposite to the arm corresponding to the one element group,
Control is started after the control by the second control unit is completed, and includes a third element group which is a switching element of all upper arms or a switching element of all lower arms among all the switching elements of the H bridge circuit. A third control unit for controlling the switching element to be off,
Of the switching elements of the H-bridge circuit, after the control is started after the control by the third control unit is finished and the time when the third element group is actually turned off and maintained has passed, A fourth controller for actually turning on the fourth element group, which is all the switching elements of the arm opposite to the arm corresponding to the three element groups,
Equipped with.

According to the above configuration, in the rotary electric machine device, the H bridge circuit has two upper arm switching elements and two lower arm switching elements, and supplies an exciting current to the field winding. The field pole is magnetized by the field winding, and an AC voltage is generated in the armature winding by the magnetic field generated by the field pole. The power conversion circuit includes a plurality of phases including an upper arm switching element and a lower arm switching element connected in series, and converts the AC voltage generated in the armature winding into a DC voltage. Then, the voltage detection unit detects the voltage of the output terminal of the power conversion circuit.

Here, when the wiring is disconnected from the output terminal of the power conversion circuit or the electric load is disconnected from the wiring during power generation by the rotating electrical machine device, a load dump voltage is generated. In this case, in order to stop the increase of the load dump voltage, it is necessary to reduce the exciting current flowing through the field winding or the current flowing through the armature winding. The inventor of the present application quickly stops the rise of the load dump voltage, that is, in order to suppress the peak value of the load dump voltage, rather than reducing the exciting current flowing in the field winding, It has been found that reducing the flowing current is effective.

Therefore, when the voltage detected by the voltage detection unit is higher than the threshold value, the first control unit selects all the upper arm switching elements or all the lower arm switching elements of all the switching elements of the power conversion circuit. The switching element including the first element group is controlled to be turned off. Therefore, when the load dump voltage is generated, the voltage detected by the voltage detection unit becomes higher than the threshold value, and the first element group is controlled to be off. This control requires a predetermined processing time including the calculation time by the first controller and the signal transmission time. Furthermore, the response delay time and the operating time of the first element group are required before the first element group is actually turned off. Then, the second control unit starts the control after the control by the first control unit is finished, and after a lapse of a time in which the first element group is actually turned off and maintained, all the switching elements of the power conversion circuit. Of these, the second element group, which is all the switching elements of the arm opposite to the arm corresponding to the first element group, is actually turned on. Therefore, it is possible to prevent a short circuit between the first element group and the second element group when the second element group of the power conversion circuit is turned on.

On the other hand, the third control unit starts the control after the control by the second control unit is completed, and is the switching element of all the upper arms or the switching element of all the lower arms of all the switching elements of the H bridge circuit. The switching elements including the third element group are controlled to be off. Then, the fourth control unit starts the control after the control by the third control unit is completed, and after a lapse of time in which the third element group is actually turned off and maintained, all the switching elements of the H-bridge circuit. Of these, the fourth element group, which is all the switching elements of the arm opposite to the arm corresponding to the third element group, is actually turned on. Therefore, when the fourth element group of the H-bridge circuit is turned on, it is possible to prevent the third element group and the fourth element group from being short-circuited.

That is, the control by the first control unit and the second control unit is executed with priority over the control by the third control unit and the fourth control unit. Therefore, when the load dump voltage is generated, the control for reducing the current flowing through the armature winding can be executed with the highest priority, and the peak value of the load dump voltage can be suppressed.

In the second means, the time from the end of the control by the first controller to the time when the second element group is actually turned on is the time from the end of the control by the third controller to the fourth element group. It is shorter than the time to actually turn on.

According to the above configuration, the time from the end of control by the first controller to the time at which the second element group is actually turned on is the time when the fourth element group is actually turned on after the end of control by the third controller. It's shorter than the time to. Therefore, at the time when the control by the first control unit and the second control unit is executed and the second element group is actually turned on, the control by the third control unit and the fourth control unit is performed by the first control unit and the second control unit. When the control is performed with priority over the control by the control unit, it becomes earlier than the time when the fourth element group is actually turned on. Therefore, it is more effective to suppress the peak value of the load dump voltage by giving the first control and the second control that reduce the current flowing through the armature winding the highest priority when the load dump voltage is generated. Become.

In the third means, the time from the end of the control by the first control unit to the time of actually turning on the second element group is the time from the end of the control by the first control unit to the first element group. Longer than the time that it is actually kept off.

According to the above configuration, the time from the end of control by the first control unit to the time at which the second element group is actually turned on is that the first element group is actually off from the end of control by the first control unit. It is longer than the time it is maintained. Therefore, the second control unit does not need to wait for the time period in which the first element group is actually turned off and maintained from the end of the control by the first control unit, and the second control unit does not need to wait. The control for turning on the second element group may be started immediately after the end of the control. Therefore, executing the control by the second control unit before the control by the third control unit and the fourth control unit after the control by the first control unit is further effective in suppressing the peak value of the load dump voltage. It becomes effective.

When the voltage detected by the voltage detection unit is higher than the threshold value and the first control unit controls only the switching elements of all the upper arms of the power conversion circuit to be turned off, the behavior of the rotating electrical machine device becomes unstable. There is a risk of becoming.

In this respect, in the fourth means, the first control unit controls all switching elements of the power conversion circuit to be turned off when the voltage detected by the voltage detection unit is higher than a threshold value. It is adopted. Therefore, when the first control unit controls the switching elements including the first element group to be off, it is possible to prevent the behavior of the rotating electrical machine device from becoming unstable.

Even when the load dump voltage is not generated, an abnormality may occur in power generation by the rotating electrical machine device, and the voltage output from the power conversion circuit may be higher than the normal value. In this case, if the load dump protection control (control by the first to fourth control units) is executed, the power generation by the rotary electric machine device may be excessively limited.

In this regard, in the fifth means, the threshold value is the first threshold value, and the voltage detected by the voltage detection unit is higher than the second threshold value set lower than the first threshold value and is higher than the first threshold value. If it is lower than the above, a configuration is adopted in which a fifth control unit is provided for controlling all the switching elements of the power conversion circuit to be turned off. Therefore, when the voltage detected by the voltage detection unit is higher than the second threshold value set lower than the first threshold value and lower than the first threshold value, the rotating electric machine is preceded by the load dump protection control. Power generation stop control by the device (control by the fifth control unit) can be executed. Therefore, when an abnormality occurs in the power generation by the rotary electric machine device, it is possible to prevent the power generation by the rotary electric machine device from being excessively limited. In addition, when the voltage detected by the voltage detection unit becomes higher than the first threshold value after becoming higher than the second threshold value, the load dump protection control is executed.

Specifically, like the sixth means, the first control unit, on the condition that the voltage detected by the voltage detection unit is higher than the first threshold value over a first time period, The switching element including the first element group is controlled to be turned off, and the fifth control unit controls the voltage detected by the voltage detection unit to exceed the second time which is set to be longer than the first time. It is possible to employ a configuration in which all the switching elements of the power conversion circuit are controlled to be turned off on the condition that the value is higher than the two threshold values. With such a configuration, when the load dump voltage is generated, the load dump protection control can be quickly executed, and when the power generation abnormality is generated, the power generation stop control can be executed with a margin.

When the control by the fifth controller is executed, the time during which all the switching elements of the power conversion circuit are actually turned off and maintained before the control by the first controller is executed. There is. In this case, the control by the first controller can be omitted, and the control by the second controller can be immediately executed.

In this regard, in the seventh means, the time period in which all the switching elements of the power conversion circuit are actually turned off and maintained by the fifth control unit has elapsed, and the voltage detection unit has detected. When the voltage is higher than the first threshold value, it is assumed that the control by the first control unit ends and the time period in which the first element group is actually turned off and maintained has elapsed, and the second control unit determines. It adopts a configuration that executes control. Therefore, before the control by the first control unit is executed, if the time in which all the switching elements of the power conversion circuit are actually turned off and maintained has elapsed, the control by the first control unit is omitted. Then, the control by the second control unit can be immediately executed. As a result, when the load dump voltage is generated, the peak value of the load dump voltage can be further suppressed.

The electric circuit diagram which shows the electric constitution of a vehicle. The electric circuit diagram which shows the electric constitution of a rotary electric machine unit. The time chart which shows the mode of load dump protection control of a comparative example. The flowchart which shows the procedure of load dump protection control. The time chart which shows the mode of load dump protection control. The flowchart which shows the procedure of overgeneration protection control. The time chart which shows the mode of overgeneration protection control.

Hereinafter, an embodiment embodied in a vehicle that travels by assisting (assisting) the driving force of an engine by a rotating electric machine unit having a power generation function and a power running function will be described based on the drawings.

As shown in FIG. 1, the vehicle 10 includes an engine 42, a starter 13, a lead storage battery 11, a lithium ion storage battery 12, electric loads 14 and 15, a rotary electric machine unit 16 and the like.

The engine 42 (internal combustion engine) is a gasoline engine, a diesel engine, or the like, and generates a driving force by burning fuel. The starter 13 (starting device) applies an initial rotational force to the output shaft (crankshaft) of the engine 42 when the engine 42 is started.

The power supply system of the vehicle 10 is a dual power supply system having a lead storage battery 11 and a lithium ion storage battery 12 as a power storage unit. The storage batteries 11 and 12 can supply power to the starter 13, various electric loads 14 and 15, and the rotary electric machine unit 16. Further, the storage batteries 11 and 12 can be charged by the rotary electric machine unit 16. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotary electric machine unit 16 and the electric loads 14 and 15, respectively.

The lead storage battery 11 is a well-known general-purpose storage battery. The lithium-ion storage battery 12 is a high-density storage battery that has less power loss during charge and discharge and higher output density and energy density than the lead storage battery 11. The lithium-ion storage battery 12 is preferably a storage battery having higher energy efficiency during charging and discharging than the lead storage battery 11. The lithium-ion storage battery 12 is configured as an assembled battery including a plurality of single cells. The rated voltage of each of these storage batteries 11 and 12 is the same, for example, 12V.

The lithium ion storage battery 12 is housed in a housing case and configured as a battery unit U integrated with a substrate. The battery unit U has output terminals P1 and P2, among which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminal P1, and the electric load 15 and the rotary electric machine unit 16 are connected to the output terminal P2. +B terminal is connected. An electrical path L4 (wiring) is provided between the output terminal P2 and the +B terminal.

The electric loads 14 and 15 have different requirements for the voltage of the electric power supplied from the storage batteries 11 and 12. Specifically, the electric load 14 includes a constant voltage required load which is required to be stable such that the voltage of the supplied electric power is constant or fluctuates at least within a predetermined range. On the other hand, the electric load 15 is a general electric load other than the constant voltage required load.

Specific examples of the electric load 14 that is the constant voltage required load include various ECUs such as a navigation device, an audio device, a meter device, and an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, it is possible to suppress the occurrence of unnecessary reset and the like in each of the above-mentioned devices, and to ensure stable operation. The electric load 14 may include a traveling system actuator such as an electric steering device or a brake device. Specific examples of the electric load 15 include a seat heater, a defroster heater for a rear window, a headlight, a wiper for a front window, and a blower fan for an air conditioner.

The rotary electric machine unit 16 (corresponding to a rotary electric machine device) controls the operation of the rotary electric machine 21, the inverter 22, the field circuit 23, the rotary electric machine ECU 24 that controls the operation of the rotary electric machine 21, and the field circuit 23. And an ASIC (Application Specific Integrated Circuit) 28. The rotary electric machine unit 16 is a generator with a motor function, and is configured as a mechano-electric integrated type ISG (Integrated Starter Generator). Details of the rotary electric machine unit 16 will be described later.

The battery unit U is provided with an electric path L1 that connects the output terminals P1 and P2 and an electric path L2 that connects the point N1 on the electric path L1 and the lithium-ion storage battery 12 to each other as internal electric paths of the unit. .. Of these, the switch 31 is provided on the electric path L1 and the switch 32 is provided on the electric path L2.

Further, the battery unit U is provided with a bypass path L3 that bypasses the switch 31. The bypass path L3 is provided so as to connect the output terminal P3 and the point N1 on the electric path L1. The output terminal P3 is connected to the lead storage battery 11 via the fuse 35. By this bypass path L3, the lead storage battery 11 and the electric load 15 and the rotary electric machine unit 16 can be connected without the switch 31. The bypass path L3 is provided with a bypass switch 36 which is, for example, a normally closed mechanical relay. By turning off (closing) the bypass switch 36, the lead storage battery 11, the electric load 15, and the rotary electric machine unit 16 are electrically connected even if the switch 31 is turned off (open).

The battery unit U includes a battery ECU 37 that controls on/off (opening/closing) of the switches 31 and 32. The battery ECU 37 is composed of a microcomputer including a CPU, a ROM, a RAM, an input/output interface and the like. The battery ECU 37 controls ON/OFF of the switches 31 and 32 based on the running state of the vehicle 10 and the storage states of the storage batteries 11 and 12. As a result, the lead storage battery 11 and the lithium ion storage battery 12 are selectively used to perform charging/discharging. For example, the battery ECU 37 calculates the state of charge (SOC) of the charge rate of the lithium ion storage battery 12, and calculates the charge amount and the discharge amount of the lithium ion storage battery 12 so that the charge rate SOC is maintained within a predetermined usage range. Control.

An engine ECU 40 is connected to the rotary electric machine ECU 24 of the rotary electric machine unit 16 and the battery ECU 37 of the battery unit U as a host control device that comprehensively manages the ECUs 24 and 37. The engine ECU 40 is composed of a microcomputer including a CPU, a ROM, a RAM, an input/output interface, etc., and controls the operation of the engine 42 based on the engine operating state and the vehicle running state at each time. The ECUs 24, 37, 40 are connected to each other by a communication line 41 that constructs a communication network such as CAN and can communicate with each other, and bidirectional communication is performed at a predetermined cycle. Thereby, the various data stored in the ECUs 24, 37, 40 are shared with each other.

Next, the electrical configuration of the rotary electric machine unit 16 will be described with reference to FIG. The rotary electric machine 21 is a three-phase AC motor, and U-phase, V-phase, and W-phase phase windings 25U, 25V, and 25W as three-phase armature windings (stator windings), and a rotor that magnetizes field poles. A field winding 26 is provided as a winding. The rotating electrical machine unit 16 has a power generation function of generating power (regenerative power generation) by rotation of an engine output shaft or an axle, and a power running function of applying a rotational force to the engine output shaft. Specifically, the rotating shaft of the rotary electric machine 21 is connected to an engine output shaft (not shown) via a belt so that the driving force can be transmitted. Via this belt, the rotation shaft of the rotary electric machine 21 rotates with the rotation of the engine output shaft to generate electric power, and the rotation of the rotation shaft of the rotary electric machine 21 rotates the engine output shaft to perform powering.

The inverter 22 (corresponding to a power conversion circuit) converts the AC voltage output from each phase winding 25U, 25V, 25W into a DC voltage and outputs the DC voltage to the battery unit U. Further, the inverter 22 converts the DC voltage input from the battery unit U into an AC voltage and outputs the AC voltage to the phase windings 25U, 25V, 25W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phase windings, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 adjusts the electric power supplied to the armature winding of the rotating electric machine 21 while the field current (exciting current) is supplied from the field circuit 23 to the field winding 26, thereby rotating the rotating electric machine. A drive circuit for driving 21 is configured.

The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase. In this embodiment, voltage-controlled semiconductor switching elements are used as the switches Sp and Sn (power transistors), and specifically, N-channel MOSFETs (bidirectional switches) are used. An upper arm diode Dp is connected in antiparallel to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel to the lower arm switch Sn. In this 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 intermediate connection point of the series connection of the switches Sp and Sn in each phase is connected to one end of each phase winding 25U, 25V, 25W.

The field circuit 23 (corresponding to an H bridge circuit) is a bidirectional switch circuit, and can apply a DC voltage to the field winding 26. In the present embodiment, the field circuit 23 (transistor chopper type excitation circuit) constitutes an H-bridge rectification circuit in which four switches Spa, Sna, Spb, Snb are combined. Since the basic configuration of each switch Spa, Sna, Spb, Snb (power transistor) is the same as each switch of the inverter 22, description thereof is omitted here. In the present embodiment, the direct current voltage applied to the field winding 26 is adjusted by switching control of the switches Spa, Sna, Spb, and Snb to control the direction and amount of the exciting current flowing in the field winding 26. To do.

Each of the switches Sp and Sn forming the inverter 22 can be independently turned on/off via a driver 27A. Each of the switches Spa, Sna, Spb, and Snb forming the field circuit 23 can be independently turned on/off via the driver 27B. The rotary electric machine unit 16 is provided with a current detection unit 29A that detects the phase currents iu, iv, and iw, and a current detection unit 29B that detects the field current if. As the current detectors 29A and 29B, those provided with a current transformer or a resistor are used, for example. Further, the rotary electric machine unit 16 is provided with a voltage sensor 30 (corresponding to a voltage detecting unit) that detects a voltage at the +B terminal (corresponding to an output terminal).

The rotary electric machine ECU 24 is composed of a microcomputer including a CPU, a ROM, a RAM, an input/output interface, and the like. Further, the rotary electric machine ECU 24 controls the inverter 22 to drive the rotary electric machine 21 after the traveling of the vehicle 10 to assist the driving force of the engine 42. The rotary electric machine 21 can give an initial rotation to the output shaft when the engine is started, and also has a function as an engine starter. The ASIC 28 is configured by a custom IC and communicates with the rotary electric machine ECU 24. The ASIC 28 adjusts an exciting current flowing through the field winding 26 based on a command from the rotary electric machine ECU 24, and controls a power generation voltage of the rotary electric machine unit 16 (an output voltage to the battery unit U). In the present embodiment, the ASIC 28 detects the generation of the load dump voltage and the excessive power generation (overpower generation) by the rotating electrical machine unit 16 based on the voltage detected by the voltage sensor 30. The rotary electric machine ECU 24 and the ASIC 28 constitute a control device of the rotary electric machine device.

By the way, if the electric path L4 is disconnected from the +B terminal or the electric loads 14 and 15 and the lead storage battery 11 are disconnected from the electric paths L1 and L4 during power generation by the rotating electrical machine unit 16 (during normal power generation and regenerative power generation). , Load dump voltage is generated. In this case, in order to stop the rise of the load dump voltage, it is necessary to reduce the exciting current flowing through the field winding 26 or reduce the current flowing through the armature winding (phase windings 25U, 25V, 25W). There is. Specifically, the following load dump protection control is performed in order to quickly stop and decrease the increase in the voltage at the +B terminal. That is, the switches Sna and Snb of the lower arm of the field circuit 23 are controlled to be turned on (closed) and the switches Spa and Spb of the upper arm are controlled to be turned off (open). Further, all the lower arm switches Sn of the inverter 22 are controlled to be turned on and all the upper arm switches Sp are controlled to be turned off.

Here, when controlling all the lower arm switches Sn of the inverter 22 to be turned on, it is necessary to prevent the upper arm and the lower arm from being short-circuited. Therefore, a predetermined dead time in which the upper arm switch Sp and the lower arm switch Sn are turned off is secured before controlling all the lower arm switches Sn to be turned on. Similarly, when the switches Sna and Snb of all the lower arms of the field circuit 23 are controlled to be turned on, it is necessary to prevent the upper arm and the lower arm from being short-circuited. Therefore, before the switches Sna and Snb of all the lower arms are controlled to be turned on, a predetermined dead time is ensured in which the switches Spa and Spb of the upper arm and the switches Sna and Snb of the lower arm are turned off.

FIG. 3 is a time chart showing a mode of load dump protection control of a comparative example.

As shown in the figure, before the time t10, regenerative power generation is performed by the rotating electrical machine unit 16, for example. Then, the switches Sp (upper arm MOS) and Sn (lower arm MOS) of the inverter 22 and the switches Spa and Spb (upper arm MOS), Sna and Snb (lower arm MOS) of the field circuit 23 are turned on and off. Controlled off. The operation of the upper arm MOS (each switch Sp) of the inverter 22 and the upper arm MOS (each switch Spa, Spb) of the field circuit 23 is not shown.

At time t10, when the load dump voltage is generated by, for example, disconnecting the electrical path L4 from the +B terminal, the voltage at the +B terminal starts to rise rapidly.

At time t11, the voltage at the +B terminal exceeds the LD threshold. Then, when the delay time TA11 elapses from the time t11, the ASIC 28 detects that the load dump voltage is generated at the time t12. Then, the LD flag is changed from 0 to 1 by the ASIC 28 and is notified to the rotary electric machine ECU 24.

When the interrupt prohibition time TA12 elapses from the time t12, the rotary electric machine ECU 24 starts control to turn off all the switches Sp and Sn of the inverter 22 at the time t13. The interrupt prohibition time TA12 is a time required for the process from when the rotating electrical machine ECU 24 receives the LD flag=1 from the ASIC 28 to when the LD protection control is started by the interrupt.

When the off processing time TA13 elapses from the time t13, all the switches Sp and Sn of the inverter 22 are turned off at the time t14. The OFF processing time TA13 is a processing time required for the rotary electric machine ECU 24 to control to turn off all the switches Sp and Sn.

At time t14, the rotary electric machine ECU 24 starts control to turn off all the switches Spa, Spb, Sna, Snb of the field circuit 23. When the off processing time TA14 elapses from the time t14, all the switches Spa, Spb, Sna, Snb are turned off at the time t15. The off processing time TA14 is a processing time required for the rotary electric machine ECU 24 to control to turn off all the switches Spa, Spb, Sna, Snb.

At time t15, the rotary electric machine ECU 24 starts control to turn on all the lower arm switches Sn of the inverter 22. When the ON processing time TA15 and the delay time TA16 have elapsed from the time t15, all the lower arm switches Sn are turned on at the time t17. As a result, no current flows from the armature winding (phase windings 25U, 25V, 25W) to the +B terminal, and the voltage at the +B terminal begins to drop. The ON processing time TA15 is a processing time required for the rotary electric machine ECU 24 to turn on all the lower arm switches Sn. The delay time TA16 is a delay time from when the control for turning on the lower arm switch Sn ends until the lower arm switch Sn actually turns on. The time TA17 (=TA14+TA15+TA16) from when all the switches Sp and Sn of the inverter 22 are turned off to when all the lower arm switches Sn are turned on, the upper arm switch Sp and the lower arm switch Sn are turned off. It corresponds to the dead time that was set. The time TA17 is longer than the predetermined dead time (the time during which all the upper arm switches Sp are actually turned off and maintained) required before controlling all the lower arm switches Sn to be turned on. Therefore, no special process is performed to secure the predetermined dead time.

At time t16, the rotary electric machine ECU 24 starts a process of waiting until the adjustment time TA18 elapses. The adjustment time TA18 is a time required to secure a predetermined dead time in which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb are turned off.

When the adjustment time TA18 elapses from the time t16, control for turning on the switches Sna and Snb of all the lower arms of the field circuit 23 is started at the time t18. When the ON processing time TA19 elapses from time t18, all the lower arm switches Sna and Snb are turned on at time t19. As a result, no current flows from the field winding 26 to the +B terminal, and the voltage at the +B terminal starts to further decrease. The ON processing time TA19 is a processing time required for the rotary electric machine ECU 24 to control to turn on all the lower arm switches Sna and Snb. Then, the time TA20 (=TA15+TA18+TA19) from turning off all the switches Spa, Spb, Sna, Snb of the field circuit 23 to turning on all the lower arm switches Sna, Snb is the upper arm. The switches Spa and Spb and the switches Sna and Snb on the lower arm are turned off.

At time t20, when the voltage at the +B terminal becomes lower than the release threshold value, the ASIC 28 detects that the load dump voltage has sufficiently decreased. Then, the LD flag is changed from 1 to 0 by the ASIC 28, and the rotary electric machine ECU 24 is notified. After time t20, the rotary electric machine ECU 24 keeps the state in which all the upper arm switches Sp of the inverter 22 are turned off and all the lower arm switches Sn are turned on. Further, the rotary electric machine ECU 24 keeps the state in which all the upper arm switches Spa and Spb of the field circuit 23 are turned off and all the lower arm switches Sna and Snb are turned on.

The inventor of the present application, in order to quickly stop the increase of the load dump voltage, that is, to suppress the peak value of the load dump voltage, rather than decreasing the exciting current flowing through the field winding 26, the armature winding. It has been found that reducing the current flowing in (phase windings 25U, 25V, 25W) is effective. The reason is that the current flowing through the armature winding is much larger than the exciting current flowing through the field winding 26. Therefore, in the present embodiment, the rotary electric machine ECU 24 prioritizes the control for reducing (refluxing) the current flowing through the armature winding over the control for reducing (refluxing) the exciting current flowing through the field winding 26. Run.

(Load dump protection control)
FIG. 4 is a flowchart showing the procedure of the load dump protection control of this embodiment. This series of processing is executed by the ASIC 28 and the rotary electric machine ECU 24.

First, the ASIC 28 determines whether the voltage at the +B terminal is higher than the LD threshold value (threshold value, corresponding to the first threshold value) based on the voltage detected by the voltage sensor 30 (S11). In this determination, when it is determined that the voltage of the +B terminal is not higher than the LD threshold value (S11: NO), the process of S11 is executed again.

On the other hand, in the determination of S11, when it is determined that the voltage of the +B terminal is higher than the LD threshold (S11: YES), the ASIC 28 determines the elapsed time after determining that the voltage of the +B terminal is higher than the LD threshold. It is determined whether it is longer than the time (corresponding to the first time) (S12). In this determination, when it is determined that the elapsed time after determining that the voltage at the +B terminal is higher than the LD threshold value is not longer than the determination time (S12: NO), the process is repeated from S11.

On the other hand, in the determination of S12, when it is determined that the elapsed time after determining that the voltage of the +B terminal is higher than the LD threshold value is longer than the determination time (S12: YES), the ASIC 28 loads the load on the rotating electrical machine ECU 24. Notify the occurrence of voltage. Specifically, the LD flag is changed from 0 to 1 and the rotary electric machine ECU 24 is notified of the LD flag=1.

Subsequently, the rotary electric machine ECU 24 determines whether or not the notification of the generation of the load dump voltage has been received (S14). Specifically, it is determined whether the LD flag=1 is received. In this determination, when it is determined that the notification of the generation of the load dump voltage has not been received (S14: NO), the process of S14 is executed again.

On the other hand, in the determination of S14, when it is determined that the notification of the generation of the load dump voltage is received (S14: YES), the rotary electric machine ECU 24 controls all the switches Sp and Sn of the inverter 22 to be off (S15). That is, all the switches Sp and Sn are controlled to be off on condition that the voltage detected by the voltage sensor 30 exceeds the LD threshold value for the determination time. All the upper arm switches Sp of the inverter 22 correspond to the first element group.

Subsequently, the rotary electric machine ECU 24 controls all the lower arm switches Sn of the inverter 22 to be turned on (S16). Here, the time from the end of the process of S15 to the time when all the lower arm switches Sn are actually turned on is maintained by actually turning off all the switches Sp and Sn from the end of the process of S15. It is longer than the time (predetermined dead time). Note that all the lower arm switches Sn of the inverter 22 correspond to the second element group.

Subsequently, the rotary electric machine ECU 24 controls all the switches Spa, Spb, Sna, Snb of the field circuit 23 to be off (S17). The switches Spa and Spb of all the upper arms of the field circuit 23 correspond to the third element group. Then, the rotary electric machine ECU 24 executes an adjustment process for ensuring a predetermined dead time in which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb are turned off and maintained (S18). .. Specifically, the process waits without starting the process of S19 until the adjustment time for ensuring the predetermined dead time has elapsed.

After executing the adjustment processing (S18) for ensuring a predetermined dead time, the rotary electric machine ECU 24 controls the switches Sna and Snb of all the lower arms of the field circuit 23 to be turned on (S19). Note that all the lower arm switches Sna and Snb of the field circuit 23 correspond to the fourth element group.

Subsequently, the ASIC 28 determines whether the voltage at the +B terminal is lower than the release threshold value based on the voltage detected by the voltage sensor 30 (S20). In this determination, when it is determined that the voltage at the +B terminal is not lower than the release threshold (S20: NO), the process of S20 is executed again.

On the other hand, in the determination of S20, when it is determined that the voltage of the +B terminal is lower than the release threshold (S20: YES), the ASIC 28 determines the elapsed time after determining that the voltage of the +B terminal is lower than the release threshold. It is determined whether it is longer than the time (S21). In this determination, when it is determined that the elapsed time after determining that the voltage at the +B terminal is lower than the release threshold value is not longer than the determination time (S21: NO), the process is repeated from S20.

On the other hand, in the determination of S21, when it is determined that the elapsed time since it is determined that the voltage of the +B terminal is lower than the release threshold is longer than the determination time (S21: YES), the ASIC 28 loads the load on the rotating electrical machine ECU 24. Signals that the voltage has dropped sufficiently. Specifically, the LD flag is changed from 1 to 0, and the rotary electric machine ECU 24 is notified of the LD flag=0.

Subsequently, the rotary electric machine ECU 24 determines whether or not a predetermined time has elapsed since all the lower arm switches Sn were actually turned on (S22). The predetermined time is set based on the magnitude of the exciting current flowing through the field winding 26. Specifically, the predetermined time is set by the formula: predetermined time=excitation current×α+β. α and β are coefficients set in advance based on experiments and the like. In this determination, when it is determined that the predetermined time has not elapsed since all the lower arm switches Sn were actually turned on (S22: NO), the process of S22 is executed again.

On the other hand, in the determination of S22, when it is determined that the predetermined time has elapsed after all the lower arm switches Sn are actually turned on (S22: YES), the rotating electrical machine ECU 24 determines that all of the inverter 22 and the field circuit 23 are to be operated. The switches Sp, Sn, Spa, Spb, Sna, Snb are controlled to be off (S23). Then, the rotary electric machine ECU 24 ends the series of processes (END).

The processes of S11 to S15 correspond to the process of the first control unit, the process of S16 corresponds to the process of the second control unit, the process of S17 corresponds to the process of the third control unit, and the process of S18. The processing of S19 and S19 corresponds to the processing of the fourth control unit. Further, the processing of S11 to S13 and the processing of S20 and S21 may be executed by the rotary electric machine ECU 24.

FIG. 5 is a time chart showing an aspect of the load dump protection control of this embodiment. The same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the control mode until time t14 is the same as that of the comparative example of FIG.

At time t14, the rotary electric machine ECU 24 starts control to turn on all the lower arm switches Sn of the inverter 22. When the ON processing time TA15 and the delay time TA16 have elapsed from the time t14, all the lower arm switches Sn are turned on at the time t32. As a result, no current flows from the armature winding (phase windings 25U, 25V, 25W) to the +B terminal, and the voltage at the +B terminal begins to drop. The time TA17R (=TA15+TA16) from turning off all the switches Sp and Sn of the inverter 22 to turning on all the lower arm switches Sn is the upper arm switch Sp and the lower arm switch Sn being off. It corresponds to the dead time that was set. The time TA17R is longer than the predetermined dead time (the time during which all the upper arm switches Sp are actually turned off and maintained) required before controlling all the lower arm switches Sn to be turned on. Therefore, no special process (dead time adjustment process) is performed to secure a predetermined dead time.

When the ON processing time TA15 elapses from the time t14, the control to turn off all the switches Spa, Spb, Sna, Snb of the field circuit 23 is started at the time t30. When the off processing time TA14 elapses from the time t30, all the switches Spa, Spb, Sna, Snb are turned off at the time t31.

At time t31, the rotary electric machine ECU 24 starts a process of waiting until the adjustment time TA18R elapses. The adjustment time TA18R is a time required to secure a predetermined dead time in which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb are turned off.

When the adjustment time TA18R has elapsed from the time t31, the control for turning on the switches Sna and Snb of all the lower arms of the field circuit 23 is started at the time t33. When the ON processing time TA19 elapses from time t33, all the lower arm switches Sna and Snb are turned on at time t34. As a result, no current flows from the field winding 26 to the +B terminal, and the voltage at the +B terminal starts to further decrease. The time TA20R (=TA18R+TA19) from when all the switches Spa, Spb, Sna, Snb of the field circuit 23 are turned off until all the switches Sna, Snb of the lower arm are turned on is the upper arm. The switches Spa and Spb and the switches Sna and Snb on the lower arm are turned off. The time TA17R from turning off all the switches Sp and Sn of the inverter 22 to turning on all the lower arm switches Sn is that all the switches Spa, Spb, Sna and Snb of the field circuit 23 are off. It is shorter than the time TA20R from when it is turned on until all the switches Sna, Snb of the lower arm are turned on.

At time t35, when the voltage at the +B terminal becomes lower than the release threshold value, the ASIC 28 detects that the load dump voltage has sufficiently decreased. Then, the LD flag is changed from 1 to 0 by the ASIC 28, and the rotary electric machine ECU 24 is notified. After time t35, the rotary electric machine ECU 24 maintains the state in which all the switches Sp and Sn of the inverter 22 are turned off. Further, the rotary electric machine ECU 24 maintains a state in which all the switches Spa, Spb, Sna, Snb of the field circuit 23 are turned off.

Even when the load dump voltage is not generated, an abnormality may occur in the power generation by the rotary electric machine unit 16 and the voltage output from the inverter 22 may be higher than the normal value. In this case, if the load dump protection control described above is executed, the power generation by the rotary electric machine unit 16 may be excessively limited. Therefore, in the present embodiment, when the voltage detected by the voltage sensor 30 is higher than the overpower generation threshold value set lower than the LD threshold value and lower than the LD threshold value, the rotary electric machine ECU 24 determines all of the inverters 22. The over-power generation protection control for controlling the switches Sp and Sn to be off is executed.

(Overgeneration protection control)
FIG. 6 is a flowchart showing a procedure of overpower generation protection control (corresponding to power generation stop control) of the present embodiment. This series of processing is executed by the rotary electric machine ECU 24.

First, based on the voltage detected by the voltage sensor 30, it is determined whether the voltage at the +B terminal is higher than the overpower generation threshold value (corresponding to the second threshold value) (S31). The overpower generation threshold is set lower than the LD threshold. When it is determined in this determination that the voltage at the +B terminal is not higher than the overpower generation threshold (S31: NO), the process of S31 is executed again.

On the other hand, in the determination of S31, when it is determined that the voltage of the +B terminal is higher than the overpower generation threshold (S31: YES), the elapsed time after determining that the voltage of the +B terminal is higher than the overpower generation threshold is the determination time. It is determined whether it is longer than (corresponding to the second time) (S32). The determination time of S32 is set longer than the determination time of S12 of FIG. In this determination, when it is determined that the elapsed time after determining that the voltage at the +B terminal is higher than the overpower generation threshold value is not longer than the determination time (S32: NO), the process is repeated from S31.

On the other hand, when it is determined in S32 that the voltage at the +B terminal is higher than the overpower generation threshold value and the elapsed time is longer than the determination time (S32: YES), all the switches Sp, Sn is controlled to off (S33). That is, under the condition that the voltage detected by the voltage sensor 30 exceeds the determination time and becomes higher than the overpower generation threshold value, all the switches Sp and Sn are controlled to be off.

Subsequently, all the switches Spa, Spb, Sna, Snb of the field circuit 23 are controlled to be off (S34).

Then, based on the voltage detected by the voltage sensor 30, it is determined whether the voltage at the +B terminal is lower than the release threshold (S35). When it is determined in this determination that the voltage at the +B terminal is not lower than the release threshold (S35: NO), the process of S35 is executed again.

On the other hand, in the determination of S35, when it is determined that the voltage of the +B terminal is lower than the release threshold (S35: YES), the elapsed time after determining that the voltage of the +B terminal is lower than the release threshold is longer than the determination time. It is determined whether it is long (S36). In this determination, when it is determined that the elapsed time after determining that the voltage at the +B terminal is lower than the release threshold is not longer than the determination time (S36: NO), the process is repeated from S35.

On the other hand, in the determination of S36, when it is determined that the elapsed time after it is determined that the voltage of the +B terminal is lower than the release threshold value is longer than the determination time (S36: YES), the protection state against overpower generation is released ( S37). Specifically, the overpower protection control is ended and the normal control is executed. Then, the rotary electric machine ECU 24 ends the series of processes (END).

Here, when the voltage of the +B terminal is higher than the LD threshold, the LD protection control of FIG. 4 is preferentially executed. That is, the over-generation protection control is executed when the voltage detected by the voltage sensor 30 is higher than the over-generation threshold and lower than the LD threshold. The processing of S31 to S33 corresponds to the processing of the fifth control unit. Further, the processing of S31 and S32 and the processing of S35 and S36 can be executed by the ASIC 28. In that case, a process of notifying the rotary electric machine ECU 24 of the occurrence of overpower generation may be added in accordance with the process of FIG.

FIG. 7 is a time chart showing an aspect of overpower protection control.

An overpower generation abnormality occurs in the rotating electrical machine unit 16, and the voltage at the +B terminal exceeds the overpower generation threshold value at time t40. Then, when the determination time has elapsed from time t40, all the switches Sp and Sn of the inverter 22 are controlled to be turned off by the rotary electric machine ECU 24 at time t41. Further, the rotary electric machine ECU 24 controls all the switches Spa, Spb, Sna, Snb of the field circuit 23 to be off.

Here, in the over-generation protection control, the current flowing in the armature winding (phase windings 25U, 25V, 25W) of the inverter 22 is not recirculated unlike the LD protection control, so the current flowing to the +B terminal immediately Does not decrease. Similarly, in the over-generation protection control, the exciting current flowing through the field winding 26 is not recirculated unlike the LD protection control, so the current flowing through the +B terminal does not immediately decrease. Therefore, the voltage at the +B terminal continues to increase from time t41 and reaches a peak value at time t42.

At time t42, current stops flowing from the armature winding (phase windings 25U, 25V, 25W) to the +B terminal, and the voltage at the +B terminal starts to decrease. Note that no current flows from the field winding 26 to the +B terminal.

At time t43, the voltage at the +B terminal becomes lower than the release threshold. Then, when the determination time has elapsed from the time t43, the rotary electric machine ECU 24 starts the normal control of the inverter 22 and the field circuit 23 at the time t44.

The embodiment described in detail above has the following advantages.

The first control unit includes the first element group that is all the upper arm switches Sp of all the switches Sp and Sn of the inverter 22 when the voltage detected by the voltage sensor 30 is higher than the LD threshold value. All the switches Sp and Sn are controlled to be off. Therefore, when the load dump voltage is generated, the voltage detected by the voltage sensor 30 becomes higher than the LD threshold value, and the first element group is controlled to be off. Then, the second control unit starts the control after the control by the first control unit is finished, and after a time period in which the first element group (all upper arm switches Sp) is actually turned off and maintained, Of all the switches Sp and Sn of the inverter 22, the second element group, which is all the switches Sn of the lower arm opposite to the upper arm corresponding to the first element group, is actually turned on. Therefore, when turning on the second element group (all lower arm switches Sn) of the inverter 22, it is possible to prevent the first element group and the second element group from being short-circuited.

The third control unit starts the control after the control by the second control unit is completed, and is the switch Spa, Spb of all the upper arms among all the switches Spa, Spb, Sna, Snb of the field circuit 23. All the switches Spa, Spb, Sna, Snb including the third element group are controlled to be off. Then, the fourth control unit starts the control after the control by the third control unit is finished, and the time period during which the third element group (the switches Spa and Spb of all the upper arms) is actually turned off and maintained elapses. After that, of all the switches Spa, Spb, Sna, Snb of the field circuit 23, the fourth element group, which is all the switches Sna, Snb of the lower arm opposite to the upper arm corresponding to the third element group, is set. Actually turn it on. Therefore, when turning on the fourth element group (all lower arm switches Sna and Snb) of the field circuit 23, it is possible to prevent the third element group and the fourth element group from being short-circuited.

The control by the first control unit and the second control unit is executed with priority over the control by the third control unit and the fourth control unit. Therefore, when the load dump voltage is generated, the control for reducing the current flowing through the armature winding (phase windings 25U, 25V, 25W) can be executed with the highest priority, and the peak value of the load dump voltage is suppressed. be able to.

The time TA17R (=TA15+TA16) from the time when the control by the first controller ends (time t14) to the time when the second element group is actually turned on (time t32) is the time when the control by the third controller ends ( It is shorter than the time TA20R (=TA18R+TA19) from the time t31) to the time (time t34) when the fourth element group is actually turned on. Therefore, when the control by the first control unit and the second control unit is executed and the second element group is actually turned on (time t32), the control by the third control unit and the fourth control unit is controlled by the first control. When the control is performed with priority over the control by the control unit and the second control unit, it becomes earlier than the time when the fourth element group is actually turned on. Therefore, it is more effective to suppress the peak value of the load dump voltage by giving the first control and the second control that reduce the current flowing through the armature winding the highest priority when the load dump voltage is generated. Become.

The time TA17R from the time when the control by the first control unit ends (time t14) to the time when the second element group is actually turned on (time t32) is the first element group from the time when the control by the first control unit ends. Is actually longer than the time it has been turned off (the required dead time). Therefore, the second control unit does not need to wait for the time period in which the first element group is actually turned off and maintained from the end of the control by the first control unit, and the second control unit does not need to wait. The control for turning on the second element group may be started immediately after the end of the control. Therefore, executing the control by the second control unit before the control by the third control unit and the fourth control unit after the control by the first control unit is further effective in suppressing the peak value of the load dump voltage. It becomes effective.

When the voltage detected by the voltage sensor 30 is higher than the LD threshold, and the first control unit controls only all the upper arm switches Sp of the inverter 22 to be off, the behavior of the rotating electrical machine unit 16 becomes unstable. There is a risk of becoming. In this respect, the first control unit controls all the switches Sp and Sn of the inverter 22 to be off when the voltage detected by the voltage sensor 30 is higher than the LD threshold value. Therefore, when the first control unit controls the switch including the first element group to be turned off, it is possible to prevent the behavior of the rotary electric machine unit 16 from becoming unstable.

A fifth control for turning off all the switches Sp and Sn of the inverter 22 when the voltage detected by the voltage sensor 30 is higher than the overpower generation threshold set lower than the LD threshold and lower than the LD threshold. It has a control unit. Therefore, when the voltage detected by the voltage sensor 30 is higher than the overpower generation threshold value set lower than the LD threshold value and lower than the LD threshold value, the rotating electrical machine unit 16 is preceded by the load dump protection control. The power generation stop control (control by the fifth control unit) can be executed. Therefore, when an abnormality occurs in the electric power generation by the rotary electric machine unit 16, it is possible to prevent the electric power generation by the rotary electric machine unit 16 from being excessively limited.

When the voltage detected by the voltage sensor 30 becomes higher than the LD threshold value after becoming higher than the overpower generation threshold value, the load dump protection control is executed. Therefore, the load dump protection control can be executed with priority over the overpower generation protection control.

The first control unit turns off the switches Sp and Sn including the first element group on condition that the voltage detected by the voltage sensor 30 exceeds the LD threshold value for the first time (judgment time). The fifth control unit, on the condition that the voltage detected by the voltage sensor 30 exceeds the overpower generation threshold value over the second time (judgment time) set longer than the first time. , All the switches Sp and Sn of the inverter 22 are controlled to be off. With such a configuration, when the load dump voltage occurs, the load dump protection control can be quickly executed, and when the power generation abnormality occurs, the power generation stop control can be executed with a margin.

The above embodiment can be modified and implemented as follows.

When the control by the fifth control unit is executed, before the control by the first control unit is executed, the time during which all the switches Sp and Sn of the inverter 22 are actually turned off and maintained (required dead Time) may have passed. In this case, the control by the first controller can be omitted, and the control by the second controller can be immediately executed. Therefore, when the time period in which all the switches of the inverter 22 are actually turned off and maintained by the fifth control unit has elapsed and the voltage detected by the voltage sensor 30 is higher than the LD threshold value, the first The control by the second control unit may be executed on the assumption that the time by which the control by the control unit is ended and the first element group is actually turned off and maintained. According to such a configuration, before the control by the first control unit is executed, if the time in which all the switches Sp and Sn of the inverter 22 are actually turned off and maintained has elapsed, the first control unit The control by the second control unit can be immediately executed by omitting the control by. As a result, when the load dump voltage is generated, the peak value of the load dump voltage can be further suppressed.

-Overload protection control by the 5th control part may be omitted and only load dump protection control (control by the 1st-4th control parts) may be performed.

In the above-described embodiment, the second control unit controls the second controller after the time period in which all the switches Sp and Sn including the first element group (all the upper arm switches Sp) are actually turned off and maintained. The element group (all lower arm switches Sn) was actually turned on. On the other hand, the second control unit controls the second element after the time in which all the switches Sp and Sn including all the lower arm switches Sn as the first element group are actually turned off and maintained. All upper arm switches Sp as a group may actually be turned on. With such a configuration, the same operational effect as that of the above-described embodiment can be obtained. That is, the second control unit may actually turn on the second element group, which is all the switches of the arm opposite to the arm corresponding to the first element group.

In the above-described embodiment, the first control unit controls all the switches Sp and Sn of the inverter 22 to be off when the voltage detected by the voltage sensor 30 is higher than the LD threshold value. On the other hand, when the voltage detected by the voltage sensor 30 is higher than the LD threshold, the first control unit can also control only all the upper arm switches Sp (first element group) to be off. The first control unit can also control only all of the lower arm switches Sn (first element group) to be off when the voltage detected by the voltage sensor 30 is higher than the LD threshold. Even in these cases, it is possible to prevent a short circuit between the first element group and the second element group when turning on the second element group of the inverter 22.

In short, when the voltage detected by the voltage sensor 30 is higher than the LD threshold, the first control unit selects all the upper arm switches Sp or all the lower arm switches among all the switches Sp and Sn of the inverter 22. The switch including the first element group, which is the switch Sn, is controlled to be turned off, and the second control unit starts the control after the control by the first control unit is finished, and the first element group is actually turned off and maintained. After a lapse of a certain time, of all the switches Sp and Sn of the inverter 22, the second element group, which is all the switches of the arm opposite to the arm corresponding to the first element group, may be actually turned on. .

In the above-described embodiment, the time TA17R from the end time of the control by the first control unit (time t14) to the time of actually turning on the second element group (time t32) is the end time of the control by the first control unit. Therefore, it was longer than the time that the first element group is actually turned off and maintained. On the other hand, the time from the end of the control by the first controller to the time when the ON processing time TA15 and the delay time TA16 elapse is such that the first element group is actually turned off from the end of the control by the first controller. It may be shorter than the time of being kept for a while. In this case, the second control unit controls the second element after the time (necessary dead time) during which the first element group is actually turned off and maintained from the end of the control by the first control unit. The process (dead time adjustment process) of waiting for the control of turning on the second element group by the second controller may be executed so that the group is actually turned on.

In the above embodiment, the control for turning on the switches Sna, Snb of all the lower arms of the field circuit 23 is started after the adjustment time TA18R required to secure the predetermined dead time has elapsed. On the other hand, the time from the end of the control by the third control unit (time t31) to the time when the ON processing time TA19 elapses, the third element group is actually turned off from the end of the control by the third control unit. It may be longer than the time it is maintained. In this case, the fourth control unit does not need to wait for the time when the third element group is actually turned off and maintained from the time when the control by the third control unit ends, and the control by the third control unit ends. The control for turning on the fourth element group may be immediately started later.

In the above-described embodiment, the time TA17R (=TA15+TA16) from the time when the control by the first control unit is finished (time t14) to the time when the second element group is actually turned on (time t32) is calculated by the third control unit. It was shorter than the time TA20R (=TA18R+TA19) from the control ending time (time t31) to the time when the fourth element group is actually turned on (time t34). On the other hand, the time TA17R may be longer than the time TA20R. Even in this case, the peak value of the load dump voltage is suppressed by giving priority to the control by the first control unit and the second control unit over the control by the third control unit and the fourth control unit. be able to.

It is also possible to employ the rotary electric machine 21 having four or more phase windings, and the inverter 22 configured by a bridge circuit having four or more upper and lower arms corresponding thereto.

16... Rotating electric machine unit, 21... Rotating electric machine, 22... Inverter, 23... Field circuit, 24... Rotating electric machine ECU, 25U... Phase winding, 25V... Phase winding, 25W... Phase winding, 26... Field winding Lines, 28... ASIC, 30... Voltage sensor, Sn... Lower arm switch, Sna... Switch, Snb... Switch, Sp... Upper arm switch, Spa... Switch, Spb... Switch.

Claims (7)

A field winding (26) for magnetizing the field pole,
An armature winding (25U, 25V, 25W) that generates an AC voltage by the magnetic field generated by the field pole,
A power conversion circuit (22) that includes a plurality of phases including an upper arm switching element (Sp) and a lower arm switching element (Sn) that are connected in series, and that converts an AC voltage generated in the armature winding into a DC voltage. When,
An H bridge circuit (23) having two upper arm switching elements (Spa, Spb) and two lower arm switching elements (Sna, Snb) and supplying an exciting current to the field winding;
A voltage detection unit (30) for detecting the voltage of the output terminal (+B) of the power conversion circuit,
A control device (24, 28) applied to a rotating electrical machine device (16) comprising:
When the voltage detected by the voltage detection unit is higher than a threshold value, of all switching elements of the power conversion circuit, a first element group that is a switching element of all upper arms or a switching element of all lower arms. A first control unit for controlling a switching element including a switch to off,
Of the switching elements of the power conversion circuit, after the control is started after the control by the first control unit is finished, and the first element group is actually turned off and maintained, A second control unit for actually turning on the second element group, which is all the switching elements of the arm opposite to the arm corresponding to the one element group,
Control is started after the control by the second control unit is completed, and includes a third element group which is a switching element of all upper arms or a switching element of all lower arms among all the switching elements of the H bridge circuit. A third control unit for controlling the switching element to be off,
Of the switching elements of the H-bridge circuit, after the control is started after the control by the third control unit is finished and the time when the third element group is actually turned off and maintained has passed, A fourth controller for actually turning on the fourth element group, which is all the switching elements of the arm opposite to the arm corresponding to the three element groups,
A control device for a rotating electrical machine device, comprising: The time from the end of the control by the first controller to the time of actually turning on the second element group is the time of actually turning on the fourth element group from the end of the control by the third controller. The control device for the rotating electrical machine device according to claim 1, wherein the control device is shorter than the time to the time point. The time from the end of the control by the first controller to the time when the second element group is actually turned on is the time when the first element group is actually turned off after the end of the control by the first controller. The control device for a rotating electrical machine device according to claim 1, wherein the control device is longer than the time period in which it is maintained. The said 1st control part controls all the switching elements of the said power converter circuit to be OFF, when the voltage detected by the said voltage detection part is higher than a threshold value. Control device of the rotating electrical machine device of. The threshold is a first threshold,
When the voltage detected by the voltage detection unit is higher than the second threshold value set lower than the first threshold value and lower than the first threshold value, all the switching elements of the power conversion circuit are turned off. The control device for a rotating electrical machine device according to any one of claims 1 to 4, further comprising a fifth control unit for controlling. The first control unit controls the switching elements including the first element group to be turned off on condition that the voltage detected by the voltage detection unit exceeds a first threshold value for a first time period or longer. Then
The fifth control unit is configured to perform the power conversion on the condition that the voltage detected by the voltage detection unit is higher than the second threshold value over a second time period that is set longer than the first time period. The control device for the rotating electrical machine device according to claim 5, wherein all the switching elements of the circuit are controlled to be turned off. The time period in which all the switching elements of the power conversion circuit are actually turned off and maintained by the fifth control unit has elapsed, and the voltage detected by the voltage detection unit is higher than the first threshold value. In this case, the control by the second control unit is executed on the assumption that the time by which the control by the first control unit ends and the first element group is actually turned off and maintained has elapsed. The control device for the rotating electrical machine device according to item 1.

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