WO2018207829A1 - Control device for rotary electric machine apparatus - Google Patents

Abstract

A control device (24, 28) equipped with: a first control unit that carries out control to turn off switches that include a first element group (all of the switches Sp) in a power conversion circuit (22) when a voltage detected by a voltage detection unit (30) is higher than a threshold value; a second control unit that begins to carry out control after the control by the first control unit has ended, and that actually turns on a second element group (all of the switches Sn) after the elapse of a period during which the first element group is kept off from when the first element group actually turned off; a third control unit that, after the control by the second control unit has ended, begins to carry out control to turn off switches that include a third element group (switches Spa, Spb) in an H-bridge circuit 23; and a fourth control unit that begins to carry out control after the control by the third control unit has ended, and that actually turns on a fourth element group (switches Sna, Snb) after the elapse of a period during which the third element group is kept off from when the third element group actually turned off.

Description

Control device for rotating electrical machine Cross-reference of related applications

This application is based on Japanese Application No. 2017-095545 filed on May 12, 2017, the contents of which are incorporated herein by reference.

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

Rotating electrical machine devices having a power generation function supply power to various electric loads and batteries via wiring connected to output terminals. 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 a 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 rotating electrical machine apparatus.

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 control is 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 on the lower arm (low side) of the three-phase bridge circuit to be on. At this time, all the upper-arm (high-side) MOS transistors are controlled to be off.

Japanese Patent Laying-Open No. 2015-80319

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 control the lower arm MOS transistor to be turned on after at least the upper arm MOS transistor is controlled to be turned off. Further, when the H-bridge circuit is composed of four MOS transistors, the same control is required when all the lower-arm MOS transistors are turned on.

Here, Patent Document 1 does not consider in which order the MOS transistor of the H-bridge circuit and the MOS transistor of the three-phase bridge circuit should be controlled. For this reason, 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 disclosure has been made to solve the above-described problems, and a main object thereof is to provide a control device for a rotating electrical machine apparatus that can suppress a peak value of a load dump voltage.

The first means for solving the above problems is as follows.
A field winding for magnetizing the field pole;
An armature winding that generates an alternating voltage by a magnetic field generated by the field pole;
A power conversion circuit comprising a plurality of phases including a switching element of an upper arm and a switching element of a lower arm connected in series, and 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 for supplying an excitation current to the field winding;
A voltage detection unit for detecting the voltage of the output terminal of the power conversion circuit;
A control device applied to a rotating electrical machine device comprising:
The first element group that is all upper-arm switching elements or all lower-arm switching elements among all the switching elements of the power conversion circuit when the voltage detected by the voltage detection unit is higher than a threshold value. A first control unit that controls the switching element including:
Control is started after the end of the control by the first control unit, and after the time that the first element group is actually turned off and maintained, among the switching elements of the power conversion circuit, the first A second control unit that actually turns on the second element group that is all the switching elements of the arm opposite to the arm corresponding to the one element group;
Control is started after the end of the control by the second control unit, and includes a third element group that is all upper-arm switching elements or all lower-arm switching elements among all the switching elements of the H-bridge circuit. A third control unit for controlling the switching element to turn off;
Control is started after the end of the control by the third control unit, and after the time that the third element group is actually turned off and maintained, among the all switching elements of the H-bridge circuit, the first A fourth control unit that actually turns on the fourth element group that is all the switching elements of the arm opposite to the arm corresponding to the three element group;
Is provided.

According to the above configuration, in the rotating electrical machine apparatus, the H bridge circuit has two upper arm switching elements and two lower arm switching elements, and supplies an excitation 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 an AC voltage generated in the armature winding into a DC voltage. The voltage detection unit detects the voltage at the output terminal of the power conversion circuit.

Here, during power generation by the rotating electrical machine device, load dump voltage is generated when the wiring is disconnected from the output terminal of the power conversion circuit or the electrical load is disconnected from the wiring. In this case, in order to stop the increase of the load dump voltage, it is necessary to reduce the excitation current flowing in the field winding or to decrease the current flowing in the armature winding. In order to stop the rise of the load dump voltage quickly, i.e., to suppress the peak value of the load dump voltage, the inventor of the present application does not reduce the exciting current flowing in the field winding, but rather reduces the excitation 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, the first control unit includes all the upper arm switching elements or all the lower arm switching elements among all the switching elements of the power conversion circuit. The switching element including the first element group is controlled to be off. For this reason, 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 turned off. This control requires a predetermined processing time including a calculation time and a signal transmission time by the first control unit. Furthermore, before the first element group is actually turned off, the response delay time, the operation time, and the like of the first element group are required. Then, the second control unit starts the control after the control by the first control unit, and after a period of time during which the first element group is actually turned off and maintained, all the switching elements of the power conversion circuit Among them, 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. For this reason, when the 2nd element group of a power converter circuit is turned ON, it can prevent that a 1st element group and a 2nd element group short-circuit.

On the other hand, the third control unit starts control after the end of the control by the second control unit, and is all the upper arm switching elements or all the lower arm switching elements among all the switching elements of the H-bridge circuit. The switching element including the third element group is controlled to be turned off. Then, the fourth control unit starts the control after the control by the third control unit, and after a time during which the third element group is actually turned off and maintained, all the switching elements of the H bridge circuit are passed. Among them, 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. For this reason, when the 4th element group of an H bridge circuit is turned on, it can prevent that a 3rd element group and a 4th element group short-circuit.

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 time of the control by the first control unit to the time point when the second element group is actually turned on is from the end time of the control by the third control unit to the fourth element group. Is shorter than the time to actually turn on.

According to the above configuration, the time from the end of control by the first control unit to the time when the second element group is actually turned on is the time when the fourth element group is actually turned on from the end of control by the third control unit. It is shorter than the time until the point of time. For this reason, 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 controlled by the first control unit and the second control unit. When the control is executed with priority over the control by the control unit, it is earlier than the time when the fourth element group is actually turned on. Therefore, when the load dump voltage is generated, the first control and the second control that reduce the current flowing through the armature winding are executed with the highest priority, which is further effective in suppressing the peak value of the load dump voltage. Become.

In the third 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 from the end of the control by the first controller to the first element group. Is longer than the time that is actually kept off.

According to the above configuration, the time from the end of control by the first control unit to the time when the second element group is actually turned on is the time when the first element group is actually turned off from the end of control by the first control unit. It is longer than the time that is maintained. For this reason, the second control unit does not need to wait for the time that the first element group is actually turned off and maintained after the end of the control by the first control unit. The control for turning on the second element group may be started immediately after the end of the control. Therefore, after the control by the first control unit, the control by the second control unit is executed before the control by the third control unit and the fourth control unit, in order to further suppress 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, if the first control unit controls only the switching elements of all the upper arms of the power conversion circuit, for example, the behavior of the rotating electrical machine device becomes unstable. There is a risk.

In this regard, in the fourth means, the first control unit is configured to control all the 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. Adopted. Therefore, when the first control unit controls the switching element including the first element group to be turned off, the behavior of the rotating electrical machine device can be suppressed from becoming unstable.

Even when no load dump voltage is generated, power generation by the rotating electrical machine device may be abnormal, and the voltage output from the power conversion circuit may be higher than the normal value. In this case, if load dump protection control (control by the first to fourth control units) is executed, power generation by the rotating electrical machine device may be excessively limited.

In this respect, 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 the first threshold value. If lower, a configuration is adopted in which a fifth control unit that controls all the switching elements of the power conversion circuit to be off is provided. For this reason, when the voltage detected by the voltage detector is higher than the second threshold set lower than the first threshold and lower than the first threshold, the rotating electrical machine is prior to 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 rotating electrical machine device, it is possible to suppress the power generation by the rotating electrical 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, load dump protection control is executed.

Specifically, as in the sixth means, the first control unit, on the condition that the voltage detected by the voltage detection unit exceeds the first threshold over a first time, The switching element including the first element group is controlled to be turned off, and the fifth control unit is configured to exceed the second time in which the voltage detected by the voltage detection unit is set 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 condition that the threshold value is higher than 2. According to such a configuration, when the load dump voltage occurs, the load dump protection control can be executed quickly, and when the power generation abnormality occurs, the power generation stop control can be executed with a margin.

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

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

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 an electric circuit diagram showing an electrical configuration of a vehicle. FIG. 2 is an electric circuit diagram showing an electrical configuration of the rotating electrical machine unit, FIG. 3 is a time chart showing an aspect of load dump protection control of a comparative example, FIG. 4 is a flowchart showing the procedure of load dump protection control, FIG. 5 is a time chart showing an aspect of load dump protection control, FIG. 6 is a flowchart showing the procedure of overpower protection control, FIG. 7 is a time chart showing an aspect of overpower protection control.

Hereinafter, an embodiment embodied in a vehicle that travels while assisting (assisting) the driving force of an engine by a rotating electrical machine unit having a power generation function and a power running function will be described with reference to 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 rotating electrical machine unit 16, and the like.

Engine 42 (internal combustion engine) is a gasoline engine, a diesel engine, or the like, and generates driving force by combustion of 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. Each storage battery 11, 12 can supply power to the starter 13, various electric loads 14, 15, and the rotating electrical machine unit 16. Further, each of the storage batteries 11 and 12 can be charged by the rotating electrical machine unit 16. In this system, a lead storage battery 11 and a lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 16 and the electrical 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 charging / discharging and higher output density and energy density than the lead storage battery 11. The lithium ion storage battery 12 is desirably a storage battery having higher energy efficiency during charging / discharging than the lead storage battery 11. The lithium ion storage battery 12 is configured as an assembled battery having a plurality of single cells. These storage batteries 11 and 12 have the same rated voltage, 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 rotating electrical 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 power supplied from the storage batteries 11 and 12. Specifically, the electric load 14 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power is constant or at least varies 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 a 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 devices, and ensure stable operation. The electric load 14 may include a travel system actuator such as an electric steering device or a brake device. Specific examples of the electric load 15 include a seat heater, a heater for a defroster for a rear window, a headlight, a wiper for a front window, and a blower fan for an air conditioner.

The rotating electrical machine unit 16 (corresponding to the rotating electrical machine device) controls the operation of the rotating electrical machine 21, the inverter 22, the field circuit 23, the rotating electrical machine ECU 24 that controls the operation of the rotating electrical machine 21, and the field circuit 23. An ASIC (Application Specific Integrated２８Circuit) 28 is provided. The rotating electrical machine unit 16 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated / Starter / Generator). Details of the rotating electrical machine unit 16 will be described later.

The battery unit U is provided with an electrical path L1 that connects the output terminals P1 and P2 and an electrical path L2 that connects the point N1 on the electrical path L1 and the lithium ion storage battery 12 as an in-unit electrical path. . Among these, the switch 31 is provided in the electrical path L1, and the switch 32 is provided in the electrical path L2.

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 electrical 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, the electric load 15, and the rotating electrical machine unit 16 can be connected without using the switch 31. In the bypass path L3, for example, a bypass switch 36 composed of a normally closed mechanical relay is provided. By turning off (closing) the bypass switch 36, the lead storage battery 11, the electrical load 15, and the rotating electrical machine unit 16 are electrically connected even if the switch 31 is turned off (opened).

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 constituted by 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 traveling state of the vehicle 10 and the storage states of the storage batteries 11 and 12. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery ECU 37 calculates the charging rate SOC (State Of Charge) of the lithium ion storage battery 12, and sets the charging amount and discharging amount to the lithium ion storage battery 12 so that the charging rate SOC is maintained within a predetermined use range. Control.

The rotating electrical machine ECU 24 of the rotating electrical machine unit 16 and the battery ECU 37 of the battery unit U are connected to an engine ECU 40 as a host controller that manages the ECUs 24 and 37 in an integrated manner. The engine ECU 40 is composed of a microcomputer including a CPU, ROM, RAM, input / output interface, and the like, and controls the operation of the engine 42 based on the engine operating state and the vehicle traveling state each time. The ECUs 24, 37, and 40 are connected 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 memorize | stored in each ECU24,37,40 are mutually shared.

Next, the electrical configuration of the rotating electrical machine unit 16 will be described with reference to FIG. The rotating electrical machine 21 is a three-phase AC motor, and U-phase, V-phase, and W- phase windings 25U, 25V, and 25W as a three-phase armature winding (stator winding), and a rotor that magnetizes the field poles. A field winding 26 is provided as a winding. The rotating electrical machine unit 16 includes a power generation function that generates power (regenerative power generation) by rotating the engine output shaft and the axle, and a power running function that applies rotational force to the engine output shaft. Specifically, the rotating shaft of the rotating electrical machine 21 is connected to an engine output shaft (not shown) via a belt so as to be able to transmit driving force. Electricity is generated by rotating the rotating shaft of the rotating electrical machine 21 with the rotation of the engine output shaft through the belt, and power is generated by rotating the engine output shaft with the rotating shaft of the rotating electrical machine 21.

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 it to the battery unit U. 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, and 25W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phases of the phase winding, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 adjusts the power supplied to the armature winding of the rotating electrical machine 21 in a state where the field current (excitation current) is supplied from the field circuit 23 to the field winding 26, thereby rotating the rotating electrical machine. The drive circuit which drives 21 is comprised.

The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase. In the present 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 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. An intermediate connection point of the series connection body of the switches Sp and Sn in each phase is connected to one end of each phase winding 25U, 25V, and 25W.

The field circuit 23 (corresponding to an H-bridge circuit) is a bidirectional switch circuit, and a DC voltage can be applied to the field winding 26. In the present embodiment, the field circuit 23 (transistor chopper-type excitation circuit) constitutes an H-bridge rectifier circuit in which four switches Spa, Sna, Spb, and 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, the description thereof is omitted here. In the present embodiment, the direction and the amount of excitation current flowing in the field winding 26 are controlled by adjusting the DC voltage applied to the field winding 26 by switching control of the switches Spa, Sna, Spb, Snb. To do.

The switches Sp and Sn constituting the inverter 22 are independently switched on / off via the driver 27A. The switches Spa, Sna, Spb, and Snb constituting the field circuit 23 are independently switched on / off via the driver 27B. The rotating electrical machine unit 16 is provided with a current detection unit 29A for detecting each phase current iu, iv, iw and a current detection unit 29B for detecting the field current if. As the current detection units 29A and 29B, for example, those including a current transformer and a resistor are used. Further, the rotating electrical machine unit 16 is provided with a voltage sensor 30 (corresponding to a voltage detection unit) that detects the voltage of the + B terminal (corresponding to an output terminal).

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

By the way, when the rotating electrical machine unit 16 generates power (during normal power generation or regenerative power generation), the electrical path L4 is disconnected from the + B terminal, or the electrical loads 14, 15 and the lead storage battery 11 are disconnected from the electrical paths L1 and L4. A 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 excitation 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 (opened). 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 all the lower arm switches Sn of the inverter 22 are controlled 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 during which the upper arm switch Sp and the lower arm switch Sn are turned off is ensured before all the lower arm switches Sn are controlled 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 on, it is necessary to prevent the upper arm and the lower arm from being short-circuited. For this reason, before all the lower arm switches Sna and Snb are controlled to be turned on, a predetermined dead time during which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb are turned off is secured.

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

As shown in the figure, before the time t10, for example, the regenerative power generation is performed by the rotating electrical machine unit 16. 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 Controlled off. The display of 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 omitted.

At time t10, for example, when the load dump voltage is generated due to the disconnection of the electrical path L4 from the + B terminal, the voltage at the + B terminal starts to increase rapidly.

At time t11, the voltage at the + B terminal exceeds the LD threshold. When the delay time TA11 elapses from time t11, the ASIC 28 detects that a load dump voltage has occurred at time t12. Then, the ASIC 28 sets the LD flag from 0 to 1, and notifies the rotating electrical machine ECU 24 of the LD flag.

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

When the off processing time TA13 elapses from time t13, at time t14, all the switches Sp and Sn of the inverter 22 are turned off. The off processing time TA13 is a processing time required for the control of turning off all the switches Sp and Sn by the rotating electrical machine ECU 24.

At time t14, the rotating electrical 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 time t14, all the switches Spa, Spb, Sna, Snb are turned off at time t15. The off processing time TA14 is a processing time required for the control of turning off all the switches Spa, Spb, Sna, Snb by the rotating electrical machine ECU 24.

At time t15, the rotating electrical 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 time t15, all the lower arm switches Sn are turned on at 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 starts to decrease. The ON processing time TA15 is a processing time required for the control of turning on all the lower arm switches Sn by the rotating electrical machine ECU 24. The delay time TA16 is a delay time from when the control for turning on the lower arm switch Sn is completed until the lower arm switch Sn is actually turned on. The time TA17 (= TA14 + TA15 + TA16) from when all the switches Sp, Sn of the inverter 22 are turned off to when all the lower arm switches Sn are turned on is the time when the upper arm switch Sp and the lower arm switch Sn are turned off. Corresponds to the dead time. The time TA17 is longer than a predetermined dead time (a time during which all the upper arm switches Sp are actually turned off and maintained) required before all the lower arm switches Sn are turned on. For this reason, special processing for ensuring a predetermined dead time is not performed.

At time t16, the rotating electrical 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 during which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb of the field circuit 23 are turned off.

When the adjustment time TA18 elapses from time t16, control for turning on the switches Sna and Snb of all the lower arms of the field circuit 23 is started at time t18. When the on-processing time TA19 elapses from time t18, the switches Sna and Snb of all the lower arms 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 control in which the rotating electrical machine ECU 24 turns on the switches Sna and Snb of all the lower arms. The time TA20 (= TA15 + TA18 + TA19) from when all the switches Spa, Spb, Sna, Snb of the field circuit 23 are turned off to when all the lower arm switches Sna, Snb are turned on is equal to the upper arm. This corresponds to a dead time when the switches Spa and Spb and the lower arm switches Sna and Snb are turned off.

When the voltage at the + B terminal becomes lower than the release threshold at time t20, the ASIC 28 detects that the load dump voltage has sufficiently decreased. Then, the ASIC 28 sets the LD flag from 1 to 0 and notifies the rotating electrical machine ECU 24 of the LD flag. After time t20, the rotating electrical machine ECU 24 maintains the state where 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 rotating electrical machine ECU 24 maintains the state where 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.

In order to stop the rise of the load dump voltage quickly, i.e., to suppress the peak value of the load dump voltage, the inventor of the present application does not reduce the exciting current flowing in the field winding 26 but reduces the armature winding. It has been found that it is effective to reduce the current flowing through ( phase windings 25U, 25V, 25W). The reason is that the current flowing through the armature winding is much larger than the excitation current flowing through the field winding 26. Therefore, in the present embodiment, the rotating electrical machine ECU 24 prioritizes control for reducing (refluxing) the current flowing through the armature winding over control for reducing (refluxing) the excitation current flowing through the field winding 26. Execute.

(Load dump protection control)
FIG. 4 is a flowchart illustrating a procedure of load dump protection control according to the present embodiment. This series of processing is executed by the ASIC 28 and the rotating electrical machine ECU 24.

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

On the other hand, if it is determined in S11 that the voltage at the + B terminal is higher than the LD threshold (S11: YES), the ASIC 28 determines the elapsed time after determining that the voltage at 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 is not longer than the determination time (S12: NO), the process is executed again from S11.

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

Subsequently, the rotating electrical 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 or not 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, when it is determined in S14 that the notification of the generation of the load dump voltage has been received (S14: YES), the rotating electrical machine ECU 24 controls all the switches Sp and Sn of the inverter 22 to be turned off (S15). That is, all the switches Sp and Sn are controlled to be turned off on condition that the voltage detected by the voltage sensor 30 exceeds the determination time and exceeds the LD threshold value. Note that all the upper arm switches Sp of the inverter 22 correspond to the first element group.

Subsequently, the rotating electrical machine ECU 24 controls all the lower arm switches Sn of the inverter 22 to be 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 after all the switches Sp and Sn are actually turned off 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 rotating electrical machine ECU 24 controls all the switches Spa, Spb, Sna, Snb of the field circuit 23 to be turned off (S17). Note that the switches Spa and Spb of all the upper arms of the field circuit 23 correspond to the third element group. Then, the rotating electrical machine ECU 24 executes an adjustment process for ensuring a predetermined dead time that is maintained by turning off the switches Spa and Spb of the upper arm and the switches Sna and Snb of the lower arm of the field circuit 23 (S18). . Specifically, the process waits without starting the process of S19 until an adjustment time for ensuring a predetermined dead time has elapsed.

After executing the adjustment process (S18) for securing a predetermined dead time, the rotating electrical 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 the switches Sna and Snb of all the lower arms of the field circuit 23 correspond to the fourth element group.

Subsequently, the ASIC 28 determines whether or not the voltage at the + B terminal is lower than the release threshold 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 at the + B terminal is lower than the release threshold (S20: YES), the ASIC 28 determines the elapsed time after determining that the voltage at the + B terminal is lower than the release threshold. It is determined whether or not 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 is not longer than the determination time (S21: NO), the process is executed again from S20.

On the other hand, if it is determined in S21 that the elapsed time after determining that the voltage at the + B terminal is lower than the release threshold is longer than the determination time (S21: YES), the ASIC 28 performs load dump to the rotating electrical machine ECU 24. Notify that the voltage has dropped sufficiently. Specifically, the LD flag is changed from 1 to 0, and LD flag = 0 is notified to the rotating electrical machine ECU 24.

Subsequently, the rotating electrical machine ECU 24 determines whether or not a predetermined time has elapsed since all the lower arm switches Sn are actually turned on (S22). The predetermined time is set based on the magnitude of the excitation current flowing through the field winding 26. Specifically, the predetermined time is set according to the formula: predetermined time = excitation current × α + β. α and β are coefficients set in advance based on experiments or the like. In this determination, when it is determined that a predetermined time has not elapsed since all the lower arm switches Sn are 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 a predetermined time has elapsed since 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 The switches Sp, Sn, Spa, Spb, Sna, Snb are controlled to be turned off (S23). Thereafter, the rotating electrical machine ECU 24 ends this series of processing (END).

The processes of S11 to S15 correspond to the process as the first control unit, the process of S16 corresponds to the process as the second control unit, the process of S17 corresponds to the process as the third control unit, and S18 And the process of S19 is equivalent to the process as a 4th control part. Further, the processing of S11 to S13 and the processing of S20 and S21 may be executed by the rotating electrical machine ECU 24.

FIG. 5 is a time chart showing an aspect of load dump protection control of the present embodiment. Note that the same portions as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

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

At time t14, the rotating electrical 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 time t14, all the lower arm switches Sn are turned on at 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 starts to decrease. The time TA17R (= 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 is the time when the upper arm switch Sp and the lower arm switch Sn are turned off. Corresponds to the dead time. The time TA17R is longer than a predetermined dead time (a time during which all the upper arm switches Sp are actually turned off and maintained) required before turning on all the lower arm switches Sn. For this reason, special processing (dead time adjustment processing) for ensuring a predetermined dead time is not performed.

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

At time t31, the rotating electrical machine ECU 24 starts a process of waiting until the adjustment time TA18R elapses. The adjustment time TA18R is a time necessary to ensure a predetermined dead time during which the upper arm switches Spa and Spb and the lower arm switches Sna and Snb of the field circuit 23 are turned off.

When the adjustment time TA18R elapses from time t31, control for turning on the switches Sna and Snb of all the lower arms of the field circuit 23 is started at time t33. When the on-processing time TA19 elapses from time t33, the switches Sna and Snb of all the lower arms 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 to when all the lower arm switches Sna, Snb are turned on is equal to the upper arm. This corresponds to a dead time when the switches Spa and Spb and the lower arm switches Sna and Snb are turned off. The time TA17R from when all the switches Sp, Sn of the inverter 22 are turned off to when all the lower arm switches Sn are turned on is when all the switches Spa, Spb, Sna, Snb of the field circuit 23 are off. The time TA20R from when the switch is turned on until the switches Sna and Snb of all the lower arms are turned on is shorter.

When the voltage at the + B terminal becomes lower than the release threshold at time t35, the ASIC 28 detects that the load dump voltage has sufficiently decreased. Then, the ASIC 28 sets the LD flag from 1 to 0 and notifies the rotating electrical machine ECU 24 of the LD flag. After time t35, the rotating electrical machine ECU 24 maintains a state where all the switches Sp and Sn of the inverter 22 are turned off. Further, the rotating electrical machine ECU 24 maintains the state where 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 rotating electrical 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 rotating electrical machine unit 16 may be excessively limited. Therefore, in the present embodiment, the rotating electrical machine ECU 24 determines that all voltages of the inverter 22 are detected 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. Overpower protection control is performed to turn off the switches Sp and Sn.

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

First, based on the voltage detected by the voltage sensor 30, it is determined whether or not the voltage at the + B terminal is higher than the overpower generation threshold (corresponding to the second threshold) (S31). The overpower generation threshold is set lower than the LD threshold. In this determination, when it is determined 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 at the + B terminal is higher than the overpower generation threshold (S31: YES), the elapsed time from the determination that the voltage at 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 is not longer than the determination time (S32: NO), the process is executed again from S31.

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

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

Subsequently, based on the voltage detected by the voltage sensor 30, it is determined whether or not the voltage at the + B terminal is lower than the release threshold (S35). In this determination, when it is determined 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, if it is determined in S35 that the voltage at the + B terminal is lower than the release threshold (S35: YES), the elapsed time after determining that the voltage at the + B terminal is lower than the release threshold is shorter 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 of the + B terminal is lower than the release threshold is not longer than the determination time (S36: NO), the process is executed again from S35.

On the other hand, if it is determined in S36 that the elapsed time after determining that the voltage of the + B terminal is lower than the release threshold is longer than the determination time (S36: YES), the protection state against overpower generation is released (S36: YES). S37). Specifically, the overpower protection control is terminated and normal control is executed. Thereafter, the rotating electrical machine ECU 24 ends this series of processing (END).

Here, when the voltage at the + B terminal is higher than the LD threshold, the LD protection control of FIG. 4 is preferentially executed. That is, the overpower protection control is executed when the voltage detected by the voltage sensor 30 is higher than the overpower threshold and lower than the LD threshold. Note that the processing of S31 to S33 corresponds to the processing as the fifth control unit. The processing of S31 and S32 and the processing of S35 and S36 can also be executed by the ASIC 28. In that case, a process for notifying the rotating electrical 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 at time t40. When the determination time has elapsed from time t40, at time t41, the rotating electrical machine ECU 24 controls all the switches Sp and Sn of the inverter 22 to be turned off. Further, the rotating electrical machine ECU 24 controls all the switches Spa, Spb, Sna, Snb of the field circuit 23 to be turned off.

Here, in the overpower protection control, the current flowing through the armature windings ( 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 is immediately Will not decrease. Similarly, in the overpower protection control, the excitation current flowing through the field winding 26 is not recirculated unlike the LD protection control, so the current flowing to the + B terminal does not decrease immediately. Therefore, the voltage at the + B terminal continues to rise from time t41 and reaches a peak value at time t42.

At time t42, no current flows from the armature winding (phase winding 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. When the determination time has elapsed from time t43, normal control of the inverter 22 and the field circuit 23 is started by the rotating electrical machine ECU 24 at time t44.

The embodiment described above has the following advantages.

The first control unit includes a first element group that is all the upper arm switches Sp among 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. All the switches Sp and Sn are controlled to be off. For this reason, 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 turned off. Then, the second control unit starts control after the end of the control by the first control unit, and after the time that the first element group (all upper arm switches Sp) are actually turned off and maintained has elapsed, Of all the switches Sp and Sn of the inverter 22, the second element group which is all the switches Sn on the lower arm opposite to the upper arm corresponding to the first element group is actually turned on. For this reason, 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 control after the end of the control by the second control unit, and is the switches Spa, Spb of all upper arms among all the switches Spa, Spb, Sna, Snb of the field circuit 23. All switches Spa, Spb, Sna, Snb including the third element group are controlled to be turned off. And the 4th control part starts control after the end of control by the 3rd control part, and the time for which the 3rd element group (all upper arm switches Spa and Spb) are actually turned off is maintained. After that, among all the switches Spa, Spb, Sna, Snb of the field circuit 23, all the switches Sna, Snb of the lower arm opposite to the upper arm corresponding to the third element group are set. Actually turn it on. Therefore, it is possible to prevent the third element group and the fourth element group from being short-circuited when the fourth element group (all lower arm switches Sna and Snb) of the field circuit 23 is turned on.

-Control by the 1st control part and the 2nd control part is performed with priority over control by the 3rd control part and the 4th control part. 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 can be suppressed. be able to.

The time TA17R (= TA15 + TA16) from the end point of control by the first control unit (time t14) to the time point when the second element group is actually turned on (time t32) is the end point of control by the third control unit ( It is shorter than the time TA20R (= TA18R + TA19) from the time t31) to the time when the fourth element group is actually turned on (time t34). For this reason, 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 the first control. When the control is executed with priority over the control by the second control unit and the second control unit, the time becomes earlier than the time when the fourth element group is actually turned on. Therefore, when the load dump voltage is generated, the first control and the second control that reduce the current flowing through the armature winding are executed with the highest priority, which is further effective in suppressing the peak value of the load dump voltage. Become.

The time TA17R from the end of control by the first control unit (time t14) to the time when the second element group is actually turned on (time t32) is from the end of control by the first control unit to the first element group. Is longer than the time that is actually turned off and maintained (required dead time). For this reason, the second control unit does not need to wait for the time that the first element group is actually turned off and maintained after the end of the control by the first control unit. The control for turning on the second element group may be started immediately after the end of the control. Therefore, after the control by the first control unit, the control by the second control unit is executed before the control by the third control unit and the fourth control unit, in order to further suppress 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 value, if 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. In this regard, 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. Therefore, it is possible to suppress the behavior of the rotating electrical machine unit 16 from becoming unstable when the first control unit controls the switch including the first element group to be turned off.

A fifth control that turns 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. A control unit is provided. For this reason, 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, the rotating electrical machine unit 16 is prior to 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 power generation by the rotating electrical machine unit 16, it is possible to prevent the power generation by the rotating electrical 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, load dump protection control is executed. For this reason, load dump protection control can be executed with priority over overpower generation protection control.

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

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

When the control by the fifth control unit is executed, the time during which all the switches Sp and Sn of the inverter 22 are actually turned off and maintained before the control by the first control unit is executed (necessary dead Time) may have elapsed. In this case, the control by the first control unit can be omitted and the control by the second control unit can be executed immediately. Therefore, when the time that 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, the first control is performed. The control by the second control unit may be executed on the assumption that the time that the control by the control unit is finished and the first element group is actually turned off and maintained has elapsed. According to such a configuration, before executing the control by the first control unit, when the time for 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 executed immediately without the control by. As a result, the peak value of the load dump voltage can be further suppressed when the load dump voltage is generated.

∙ Overload protection control by the fifth control unit may be omitted and only load dump protection control (control by the first to fourth control units) may be executed.

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

In the above embodiment, the first controller 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. 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 all the upper arm switches Sp (first element group) to be turned off. Further, the first control unit can also control only all the lower arm switches Sn (first element group) to be turned 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 the first element group and the second element group from being short-circuited when the second element group of the inverter 22 is turned on.

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

In the above embodiment, the time TA17R from the end point of control by the first controller (time t14) to the point of time when the second element group is actually turned on (time t32) is the end point of control by the first controller. Thus, the first element group is longer than the time that the first element group is actually turned off and maintained. In contrast, the time from the end of the control by the first control unit to the time when the on-processing time TA15 and the delay time TA16 elapse is the time when the first element group is actually turned off from the end of the control by the first control unit. It may be shorter than the time of being maintained. In this case, after the second control unit has passed the time (necessary dead time) that the first element group is actually turned off and maintained after the end of control by the first control unit, the second element A process of waiting for control to turn on the second element group (dead time adjustment process) may be executed so that the group is actually turned on.

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

In the above embodiment, the time TA17R (= TA15 + TA16) from the end point of control by the first controller (time t14) to the point of time when the second element group is actually turned on (time t32) is determined by the third controller. It was shorter than the time TA20R (= TA18R + TA19) from the end of control (time t31) to the time when the fourth element group was 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 prioritizing 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.

· An electric rotating machine 21 having four or more phase windings and an inverter 22 constituted by a bridge circuit having four or more upper and lower arms corresponding to the rotating electric machine 21 may be employed.

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 (7)

1. A field winding (26) for magnetizing the field poles;
   An armature winding (25U, 25V, 25W) that generates an AC voltage by a magnetic field generated by the field pole;
   A power conversion circuit (22) comprising a plurality of phases including a switching element (Sp) of the upper arm and a switching element (Sn) of the lower arm connected in series, and converting 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 detector (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:
   The first element group that is all upper-arm switching elements or all lower-arm switching elements among all the switching elements of the power conversion circuit when the voltage detected by the voltage detection unit is higher than a threshold value. A first control unit that controls the switching element including:
   Control is started after the end of the control by the first control unit, and after the time that the first element group is actually turned off and maintained, among the switching elements of the power conversion circuit, the first A second control unit that actually turns on the second element group that is all the switching elements of the arm opposite to the arm corresponding to the one element group;
   Control is started after the end of the control by the second control unit, and includes a third element group that is all upper-arm switching elements or all lower-arm switching elements among all the switching elements of the H-bridge circuit. A third control unit for controlling the switching element to turn off;
   Control is started after the end of the control by the third control unit, and after the time that the third element group is actually turned off and maintained, among the all switching elements of the H-bridge circuit, the first A fourth control unit that actually turns on the fourth element group that is all the switching elements of the arm opposite to the arm corresponding to the three element group;
   A control device for a rotating electrical machine apparatus.
2. The time from the end of control by the first control unit to the time when the second element group is actually turned on is the time when the fourth element group is actually turned on from the end of control by the third control unit. The control device for a rotating electrical machine apparatus according to claim 1, wherein the control time is shorter than a time until a time point.
3. The time from the end of control by the first control unit to the time when the second element group is actually turned on is the time when the first element group is actually turned off from the end of control by the first control unit. The control device for a rotating electrical machine apparatus according to claim 1 or 2, wherein the control device is longer than the time maintained.
4. The first control unit according to any one of claims 1 to 3, wherein when the voltage detected by the voltage detection unit is higher than a threshold, all the switching elements of the power conversion circuit are controlled to be turned off. Control device for a rotating electrical machine.
5. The threshold is a first threshold;
   When the voltage detected by the voltage detection unit is higher than the second threshold set lower than the first threshold and lower than the first threshold, all the switching elements of the power conversion circuit are turned off. The control device for a rotating electrical machine apparatus according to any one of claims 1 to 4, further comprising a fifth control unit for controlling.
6. 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 the first threshold over a first time. And
   The fifth control unit may convert 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 set longer than the first time. The control device for a rotating electrical machine apparatus according to claim 5, wherein all the switching elements of the circuit are controlled to be turned off.
7. The time that 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 assuming that the control by the first control unit ends and the time that the first element group is actually turned off and maintained has elapsed. The control apparatus of the rotary electric machine apparatus described in 1.

Images