WO2018066441A1

WO2018066441A1 - Control device for rotary electric machine

Info

Publication number: WO2018066441A1
Application number: PCT/JP2017/035070
Authority: WO
Inventors: 拓人鈴木; 洋稲村
Original assignee: 株式会社デンソー
Priority date: 2016-10-07
Filing date: 2017-09-27
Publication date: 2018-04-12
Also published as: JP6589803B2; JP2018061398A

Abstract

In the present invention a power supply system is equipped with: a rotary electric machine (21) capable of power generation and power running operations; a switching circuit unit (22) for energizing each phase of the rotary electric machine by turning on/off a plurality of switching elements (Sp, Sn); power storage units (11, 12) connected to the switching circuit unit; and switches (31, 32) provided in an electrical path between the switching circuit unit and the power storage units. A rotary electric machine control device (23) is equipped with: a determination unit for determining that overcurrent has flowed in the rotary electric machine and/or the switching circuit unit, on the basis of an increase, to a prescribed threshold overcurrent value (TH1), of an energization current flowing in the switching circuit unit; a switch control unit for opening the switches on the basis of a determination result from the determination unit; and a current-limiting unit for limiting inrush current generated in conjunction with the start of driving when power-running driving of the rotary electric machine begins.

Description

Rotating electrical machine control device

Cross-reference of related applications

This application is based on Japanese Application No. 2016-199044 filed on Oct. 7, 2016, and the description is incorporated herein.

The present disclosure relates to a rotating electrical machine control device applied to a power supply system mounted on a vehicle or the like.

Conventionally, for example, a technique using a rotating electric machine having both a power generation function and a power running function as a power source for vehicles has been put into practical use. As a technique for driving a rotating electrical machine, a configuration including a storage battery and an inverter that converts DC power from the storage battery into AC power is used (see, for example, Patent Document 1).

Here, for example, when a power supply line and a ground line are short-circuited in an inverter, an overcurrent flows through the inverter, and there is a concern that a malfunction caused by the current may occur. In this case, as a fail-safe process, a switch provided between the inverter and the storage battery is forcibly opened to stop the power supply from the storage battery to the inverter.

Japanese Patent No. 5837229

By the way, while an overcurrent flows in the inverter due to a short circuit, a large current flows as an inrush current at the beginning of powering driving of the rotating electrical machine. In this case, if a large current as an inrush current is detected, it is regarded as an overcurrent, and there is a concern that it may be erroneously determined that a short circuit abnormality (ie, an overcurrent abnormality) has occurred as a result. In light of these circumstances, there is room for improvement in existing technology.

The present disclosure has been made in view of the above problems, and a main purpose thereof is to provide a rotating electrical machine control device that can appropriately determine the occurrence of overcurrent.

Hereinafter, the means for solving the above-mentioned problems and the effects thereof will be described. In the following, for ease of understanding, the reference numerals of the corresponding components in the embodiment of the disclosure are appropriately shown in parentheses, but are not limited to the specific configurations shown in parentheses.

In the first means,
A rotating electrical machine that enables operation of power generation and power running;
A switching circuit unit for energizing each phase in the rotating electrical machine by turning on and off a plurality of switching elements;
A power storage unit connected to the switching circuit unit;
A rotating electrical machine control device applied to a power supply system comprising a switch provided in an electrical path between the switching circuit unit and the power storage unit,
A determination unit that determines that an overcurrent has flowed into at least one of the rotating electrical machine and the switching circuit unit, based on the fact that the energization current flowing through the switching circuit unit has increased to a predetermined overcurrent threshold;
A switch control unit that opens the switch based on a determination result of the determination unit;
A current limiting unit that limits an inrush current generated at the start of powering driving of the rotating electrical machine; and
Is provided.

In the switching circuit section, for example, an overcurrent flows due to a short circuit between the power supply line and the ground line. On the other hand, at the beginning of the power running drive of the rotating electrical machine, a large current flows as an inrush current. In this case, if a large current as an inrush current is detected, it is regarded as an overcurrent, and there is a concern that it may be erroneously determined that a short circuit abnormality (ie, an overcurrent abnormality) has occurred as a result. In this respect, in the above configuration, since the inrush current generated at the start of powering driving of the rotating electrical machine is limited, the inrush current is suppressed from being regarded as an overcurrent, and as a result, a short circuit abnormality (that is, an overcurrent abnormality) ) Erroneous determination is suppressed.

The second means includes an energization control unit that sets a target value of the energization current in the switching circuit unit and controls on / off of the switching element based on an on / off ratio of the switching element determined according to the target value. The current limiting unit limits the inrush current by limiting the target value at the start of powering driving of the rotating electrical machine.

In this case, if the target value of the energization current in the switching circuit unit is limited, the on / off ratio (for example, duty ratio) of the switching element determined according to the target value can be reduced. Therefore, the inrush current can be suitably limited at the start of the power running drive of the rotating electrical machine.

In the third means, the current limiting unit sets the target value as a value smaller than the overcurrent threshold.

According to the above configuration, since the target value of the energization current in the switching circuit unit is set as a value smaller than the overcurrent threshold, a configuration suitable for distinguishing the inrush current from the overcurrent can be realized.

The fourth means includes a limit changing unit that changes a degree of limitation of the inrush current by the current limiting unit in accordance with an increase in rotation of the rotating electrical machine after the start of powering driving of the rotating electrical machine.

After the start of powering drive of the rotating electrical machine, the neutral point voltage increases due to the motor electromotive force as the rotational speed of the rotating electrical machine increases. Therefore, the inrush current is gradually reduced. In this respect, according to the above-described configuration, the degree of restriction of the inrush current is changed according to the rotation increase of the rotating electrical machine, so that the current limitation can be appropriately performed according to the state of the rotating electrical machine.

The fifth means includes a limit release unit that releases the limit of the inrush current by the current limiting unit in accordance with the rotation increase of the rotating electrical machine after the start of powering drive of the rotating electrical machine.

According to the above configuration, since the limit of the inrush current is released according to the rotation increase of the rotating electrical machine, it is possible to appropriately limit the current according to necessity.

The sixth means has an idling stop control function of automatically stopping the engine with establishment of a predetermined automatic stop condition and restarting the engine with establishment of a predetermined restart condition after the automatic stop, The present invention is applied to a vehicle in which the restart is performed by the power running drive of the rotating electrical machine, and the current limiting unit limits the inrush current at the start of the power running drive of the rotating electrical machine in response to the restart request.

The power when the rotating electric machine is power-driven in the vehicle is used, for example, when the engine is restarted in idling stop control or when power is assisted for vehicle acceleration. In this case, in particular, when the engine is restarted, the rotating electrical machine is driven by power running from the engine stopped state, so it is considered that the inrush current tends to increase. In this regard, according to the above configuration, since the inrush current is limited at the time of starting the power running drive of the rotating electrical machine in response to the engine restart request, the inrush current and the overcurrent are preferably set during the engine restart. Can be distinguished.

According to a seventh means, in the power supply system, a blocking unit that blocks the path as the overcurrent flows is provided in a path connecting the power storage unit and the rotating electrical machine.

In a configuration in which a blocking unit is provided in a path connecting the power storage unit and the rotating electrical machine, and the blocking unit performs path blocking when an overcurrent flows, the blocking unit is unintentionally caused by inrush current flowing. There is concern about being blocked. In this respect, since the inrush current is limited at the start of the power running drive of the rotating electrical machine as described above, it is possible to suppress the inconvenience that the interrupting section is interrupted unintentionally.

In an eighth means, the power storage unit includes a first power storage unit and a second power storage unit connected in parallel to the switching circuit unit, while the switch includes the switching circuit unit and the first power storage unit. Applied to a power supply system provided with a first switch that opens and closes a path between and a second switch that opens and closes a path between the switching circuit unit and the second power storage unit, In the case where current limiting by the current limiting unit is performed at the start of powering driving of the rotating electrical machine, both the first switch and the second switch are closed.

When the inrush current is limited at the start of the power running drive of the rotating electrical machine, the power supplied to the rotating electrical machine is limited, so the torque of the rotating electrical machine decreases accordingly. In this regard, according to the above-described configuration, current limitation is performed at the start of powering drive of the rotating electrical machine, while power is supplied to the rotating electrical machine by the first power storage unit and the second power storage unit by turning on each switch. . Therefore, torque compensation of the rotating electrical machine is possible, and consequently, powering driving of the rotating electrical machine in a current limited state can be optimized.

In a ninth means, the switch control unit includes a limit release unit that releases the limit of the inrush current by the current limiting unit in response to an increase in rotation of the rotating electrical machine after the start of powering drive of the rotating electrical machine. After the start of powering driving of the rotating electrical machine, before the restriction release by the restriction release unit, the first power storage unit is connected from the state in which one of the first power storage unit and the second power storage unit is connected to the switching circuit unit. And controlling the opening and closing of the first switch and the second switch so as to shift both the power storage unit and the second power storage unit to a state of being connected to the switching circuit unit.

According to the above configuration, after starting the power running drive of the rotating electrical machine, power is supplied to the switching circuit unit by one of the first power storage unit and the second power storage unit in a state where the current limitation is performed and before the release. Transition from the state (one power supply state) to the state where both the first power storage unit and the second power storage unit supply power to the switching circuit unit (two power supply states) is performed. In this case, in the rotating electrical machine, it is conceivable that the torque decreases as the rotational speed increases at the beginning of driving, but torque compensation by both power storage units is possible even if the torque decreases. In addition, when the current limit is released, if there is a transition from the one power supply state to the two power supply state, there is a risk of voltage fluctuation, but before the current limit is released, the two power supplies are supplied from the one power supply state. By performing the transition to the state, it is possible to avoid inconvenience due to voltage fluctuation.

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 a power supply system of an embodiment. FIG. 2 is a circuit diagram showing an electrical configuration of the rotating electrical machine unit. FIG. 3 is a perspective view showing a part of the switch module; FIG. 4 is a flowchart illustrating a processing procedure of overcurrent abnormality determination by the rotating electrical machine ECU. FIG. 5 is a flowchart showing a processing procedure of abnormality monitoring by the engine ECU. FIG. 6 is a flowchart showing a processing procedure of fail-safe control by the battery ECU. FIG. 7 is a time chart for specifically explaining processing when an overcurrent occurs in the inverter. FIG. 8 is a flowchart showing a processing procedure of powering drive control of the rotating electrical machine. FIG. 9 is a time chart showing more specifically current control at the beginning of powering drive of the rotating electrical machine, FIG. 10 is a diagram showing the relationship between the rotational speed of the rotating electrical machine and the limit value of the target energization current, FIG. 11 is a flowchart showing a processing procedure of powering drive control of a rotating electrical machine in another example. FIG. 12 is a flowchart showing a processing procedure of powering drive control of a rotating electrical machine in another example, FIG. 13A is a diagram showing the relationship between the inverter voltage and the maximum duty ratio, and FIG. 13B is a diagram showing the relationship between the stator temperature and the maximum duty ratio.

Hereinafter, embodiments embodying the present disclosure will be described with reference to the drawings. In the present embodiment, an in-vehicle power supply system that supplies power to various devices of the vehicle in a vehicle that runs using an engine (internal combustion engine) as a drive source is embodied.

As shown in FIG. 1, this power supply system is a dual power supply system having a lead storage battery 11 as a first power storage unit and a lithium ion storage battery 12 as a second power storage unit. In addition, power can be supplied to the various

electric loads

14 and 15 and the rotating electrical machine unit 20. Further, each of the

storage batteries

11 and 12 can be charged by the rotating electrical machine unit 20. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 20, and the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the

electrical loads

14 and 15. .

The lead storage battery 11 is a well-known general-purpose storage battery. On the other hand, the lithium ion storage battery 12 is a high-density storage battery that has less power loss during charging / discharging than the lead storage battery 11, and has a high output density and energy density. The lithium ion storage battery 12 may be a storage battery having higher energy efficiency during charging / discharging than the lead storage battery 11. Moreover, the lithium ion storage battery 12 is comprised as an assembled battery which has a some single cell, respectively. These

storage batteries

11 and 12 have the same rated voltage, for example, 12V.

Although the detailed description by illustration is omitted, 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, P2 and P0, of which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminals P1 and P0, and the electric load 15 and the rotation are connected to the output terminal P2. The electric unit 20 is connected.

The electric loads 14 and 15 have different requirements for the voltage of the power supplied from the

storage batteries

11 and 12. Among these, 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 fluctuates within a predetermined range. On the other hand, the electric load 15 is a general electric load other than the constant voltage required load. It can be said that the electric load 14 is a protected load. In addition, it can be said that the electric load 14 is a load that does not allow a power supply failure, and the electric load 15 is a load that allows a power supply failure compared to the electric load 14.

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 an unnecessary reset or the like in each of the above devices, and to realize a 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 20 includes a rotating electrical machine 21 as a three-phase AC motor, an inverter 22 as a power conversion device (switching circuit unit), and a rotating electrical machine ECU 23 that controls the operation of the rotating electrical machine 21. The rotating electrical machine unit 20 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated / Starter / Generator).

Here, the electrical configuration of the rotating electrical machine unit 20 will be described with reference to FIG. The rotating electrical machine 21 includes U-phase, V-phase, and W-

phase phase windings

24U, 24V, and 24W as three-phase armature windings, and a field winding 25. The

phase windings

24U, 24V, 24W are star-connected and are connected to each other at a neutral point. The rotating shaft of the rotating electrical machine 21 is drivingly connected to an engine output shaft (not shown) by a belt, and the rotating shaft of the rotating electrical machine 21 is rotated by the rotation of the engine output shaft. The engine output shaft rotates. That is, the rotating electrical machine 21 has 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. For example, the rotating electrical machine 21 is driven by powering at the time of engine restart in idling stop control or power assist for vehicle acceleration.

The inverter 22 converts the AC voltage output from each phase winding 24U, 24V, 24W 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

24U, 24V, and 24W. 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 constitutes a drive circuit that drives the rotating electrical machine 21 by adjusting the electric power supplied to the rotating electrical machine 21.

The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase, and energization is performed for each phase by turning on and off the switches Sp and Sn. In the present embodiment, a voltage-controlled semiconductor switching element is used as each of the switches Sp and Sn. Specifically, an N-channel MOSFET is 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.

Supplementary explanation will be given for the configuration of each switch Sp, Sn. FIG. 3 is a perspective view showing a part of the switch module 50 constituting each of the switches Sp and Sn. The switch module 50 includes a main body 51 formed by resin-molding a semiconductor switching element and a peripheral circuit, and a lead 52 (bus bar) connected to the semiconductor switching element and the like and protruding from the side of the main body 51. have. The lead portion 52 is mounted by welding or the like on the substrate or a mounting position that is a predetermined portion at the tip portion. In the lead part 52, a narrow part 52a is provided in a part thereof. For this reason, when an excessive current (overcurrent) flows to the switch module 50 through the lead portion 52, the narrow portion 52a is melted by heat generation.

The 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 24U, 24V, 24W. Further, a voltage sensor 26 that detects the input / output voltage of the inverter 22 is provided between the high-voltage side path and the low-voltage side path of the inverter 22. In addition, the rotating electrical machine unit 20 is provided with, for example, a current sensor 27 that detects a current flowing through an energization path of the inverter 22 and a current sensor 28 that detects a current flowing through the field winding 25. The current sensor 27 may be provided between the inverter 22 and each phase winding 24U, 24V, 24W (symbol 27a in the figure), and each phase between the lower arm switch Sn and the ground line. (Reference numeral 27b in the figure). The rotating electrical machine 21 is provided with a temperature sensor 29 for detecting the temperature of the stator. Detection signals from the sensors 26 to 29 are appropriately input to the rotating electrical machine ECU 23. Although not shown, the rotating electrical machine 21 is provided with a rotation angle sensor that detects angle information of the rotor, and the inverter 22 is provided with a signal processing circuit that processes a signal from the rotation angle sensor. Yes.

The rotating electrical machine ECU 23 is constituted by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine ECU 23 adjusts the excitation current flowing through the field winding 25 by an IC regulator (not shown) inside. Thereby, the power generation voltage (output voltage with respect to the battery unit U) of the rotary electric machine unit 20 is controlled. The rotating electrical machine ECU 23 controls on / off of the switches Sp and Sn of each phase according to the energization phase, and controls the energization current by adjusting an on / off ratio (for example, duty ratio) when energizing each phase. Here, the rotating electrical machine ECU 23 assists the driving force of the engine by controlling the inverter 22 to drive the rotating electrical machine 21 after the vehicle starts running. The rotating electrical machine 21 can apply initial rotation to the crankshaft when starting the engine, and also has a function as an engine starting device.

Next, the electrical configuration of the battery unit U will be described. As shown in FIG. 1, in the battery unit U, as an in-unit electric path, an electric path L1 that connects the output terminals P1 and P2, and an electric path L2 that connects a point N0 on the electric path L1 and the lithium ion storage battery 12 And are provided. Among these, the switch 31 is provided in the electrical path L1, and the switch 32 is provided in the electrical path L2. In addition, in terms of an electrical path connecting the lead storage battery 11 and the lithium ion storage battery 12, a switch 31 is provided on the lead storage battery 11 side of the connection point N0 with the rotating electrical machine unit 20 in the electrical path, and the connection point N0. The switch 32 is provided on the lithium ion storage battery 12 side.

Each of the switches 31 and 32 includes, for example, 2 × n MOSFETs (semiconductor switching elements), and the parasitic diodes of the two sets of MOSFETs are connected in series so as to be opposite to each other. When the switches 31 and 32 are turned off, the parasitic diode completely cuts off the current flowing through the path where the switches are provided. As the switches 31 and 32, IGBTs or bipolar transistors can be used instead of MOSFETs. When IGBTs or bipolar transistors are used as the switches 31 and 32, diodes in opposite directions may be connected in parallel to the switches 31 and 32, respectively, instead of the parasitic diode.

Further, the battery unit U is provided with a bypass path L0 that bypasses the switch 31. The bypass path L0 is provided so as to connect the output terminal P0 and the point N0 on the electrical path L1. The output terminal P0 is connected to the lead storage battery 11 through the fuse 35. By the bypass path L0, the lead storage battery 11, the electrical load 15, and the rotating electrical machine unit 20 can be connected without using the switch 31. In the bypass path L0, for example, a bypass switch 36 made of a normally closed mechanical relay is provided. By turning on (closing) the bypass switch 36, the lead storage battery 11, the electric load 15, and the rotating electrical machine unit 20 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 the on / off of the switches 31 and 32 based on the storage state of each of the

storage batteries

11 and 12 and the command value from the engine ECU 40 that is the host controller. 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 SOC (remaining capacity: State Of Charge) of the lithium ion storage battery 12, and sets the charge amount and discharge amount to the lithium ion storage battery 12 so that the SOC is maintained within a predetermined use range. Control.

The rotating electrical machine ECU 23 of the rotating electrical machine unit 20 and the battery ECU 37 of the battery unit U are connected to an engine ECU 40 as a host controller that manages these

ECUs

23 and 37 in an integrated manner. The engine ECU 40 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like, and controls the operation of the engine 42 based on each engine operation state and vehicle running state. The engine ECU 40 has a function of performing idling stop control. As is well known, the idling stop control automatically stops the engine when a predetermined automatic stop condition is satisfied, and restarts the engine when the predetermined restart condition is satisfied under the automatic stop state.

These

ECUs

23, 37, 40 and other various in-vehicle ECUs (not shown) are connected to each other via a communication line 41 that constructs a communication network such as a CAN, and can communicate with each other at predetermined intervals. To be implemented. Thereby, the various data memorize | stored in each ECU23,37,40 can mutually be shared. The inverter 22 and the rotating electrical machine ECU 23 correspond to a “first control device”, the battery ECU 37 corresponds to a “second control device”, and the engine ECU 40 corresponds to a “third control device”. The communication line 41 corresponds to a “signal transmission unit”.

By the way, in the inverter 22, there is a possibility that a closing failure may occur in each of the switches Sp and Sn. If a closing failure of the upper arm switch Sp and a closing failure of the lower arm switch Sn occur in the same phase, the power line and the ground line There is a concern that an overcurrent may flow through the switches Sp and Sn due to the short circuit. In this case, if an overcurrent flows through each of the switches Sp and Sn, the narrow portion 52a of the lead portion 52 in the switch module 50 is melted, and accordingly, the overcurrent is suppressed from flowing continuously.

In the rotating electrical machine unit 20, there is a possibility that a short circuit may occur in the rotating electrical machine 21 in addition to the short circuit in the inverter 22. For example, if a short circuit occurs in any part of each phase winding 24U, 24V, 24W, Overcurrent flows through the switches Sp and Sn of the inverter 22.

In the present embodiment, when the lead portion 52 is blown due to an overcurrent, the failure of the battery unit U in a state where the current is reduced is focused on the fact that the current in the energization path suddenly drops from a large current due to the blow. As a safe process, the switches 31 and 32 are forcibly opened. In this case, the power supply from the lead storage battery 11 or the lithium ion storage battery 12 to the inverter 22 is stopped by opening the switches 31 and 32. In the present embodiment, the rotating electrical machine ECU 23 is based on the results of the first determination that the energization current flowing through the inverter 22 has increased to a predetermined overcurrent threshold and the second determination that the current has subsequently decreased. It is determined that an overcurrent has passed through (corresponding to an overcurrent determination unit). Further, the battery ECU 37 opens the switches 31 and 32 (corresponding to a switch control unit) based on the result of the overcurrent determination in the rotating electrical machine ECU 23.

In this system, the engine ECU 40 of the

ECUs

23, 37, and 40 serves as a host ECU. Based on a command from the engine ECU 40, the rotating electrical machine 21 is controlled by the rotating electrical machine ECU 23 and the battery ECU 37. Charge / discharge control and the like are performed. Under such circumstances, when an overcurrent abnormality of the inverter 22 occurs, first, the rotating electrical machine ECU 23 determines that an overcurrent abnormality has occurred, and then an abnormality signal is transmitted to the engine ECU 40 via the communication line 41. From the engine ECU 40, a fail safe signal corresponding to the abnormal signal is transmitted to the battery ECU 37 via the communication line 41. However, in this case, after the occurrence of an abnormality, after the communication from the rotating electrical machine ECU 23 to the engine ECU 40 and the communication from the engine ECU 40 to the battery ECU 37 are performed, the battery unit U performs switch opening (fail-safe processing). Therefore, it takes time until the switch is opened, and there is a concern that a secondary malfunction may occur. Assuming that communication is performed discretely between the ECUs, there is a concern that the time required to open the switch will be prolonged.

Therefore, in the present embodiment, the following characteristic configuration is adopted on the assumption that the

ECUs

23, 37, and 40 can communicate with each other via the communication line 41. That is,
(1) The rotating electrical machine ECU 23 transmits an overcurrent abnormality signal indicating that an overcurrent has flown in the inverter 22 to the battery ECU 37 and the engine ECU 40.
(2) Based on the overcurrent abnormality signal received from the rotating electrical machine ECU 23, the engine ECU 40 transmits a forced opening signal for forcibly opening the switches 31 and 32 to the battery ECU 37.
(3) The battery ECU 37 forcibly opens the switches 31 and 32 based on the earlier of the reception of the overcurrent abnormality signal from the rotating electrical machine ECU 23 and the reception of the forcible opening signal from the engine ECU 40.

In this case, the battery ECU 37 can directly receive the overcurrent abnormality signal from the rotating electrical machine ECU 23 without waiting for the reception of the forced release signal from the engine ECU 40, and can perform an emergency treatment based on the overcurrent abnormality signal. it can.

In the inverter 22, an overcurrent flows due to a short circuit as described above, while a large current flows as an inrush current at the beginning of powering driving of the rotating electrical machine 21. In this case, if a large current as an inrush current is detected, it is regarded as an overcurrent, and there is a concern that it may be erroneously determined that a short circuit abnormality (ie, an overcurrent abnormality) has occurred as a result.

Therefore, in the present embodiment, the rotating electrical machine ECU 23 limits the inrush current generated when the rotating electrical machine 21 starts the power running drive (corresponding to a current limiting unit). In this case, by limiting the inrush current to a current smaller than the overcurrent determination value, it is possible to clearly identify whether the current is an inrush current or an overcurrent.

More specifically, the rotating electrical machine ECU 23 limits the current target value by a predetermined limit value at the beginning of the power running drive of the rotating electrical machine 21, and based on the limited target value, feedback of the energization current of the inverter 22 is performed. Implement control. For example, the overcurrent determination value is 400A and the limit value is 300A. In this case, if current limitation is not performed, a large current exceeding the overcurrent determination value may flow as an inrush current. However, the inrush current is suppressed to a smaller current than the overcurrent determination value due to the current limitation.

Further, after starting the power running drive of the rotating electrical machine 21, the neutral point voltage increases due to the motor electromotive force as the rotational speed of the rotating electrical machine 21 increases. Therefore, the inrush current is gradually reduced. Therefore, the rotating electrical machine ECU 23 releases the restriction on the current target value based on the fact that the rotational speed of the rotating electrical machine 21 has increased to a predetermined rotational speed after the start of powering drive of the rotating electrical machine 21.

Next, the arithmetic processing performed by each

ECU

23, 37, 40 will be specifically described using a flowchart or the like.

FIG. 4 is a flowchart showing a processing procedure of overcurrent abnormality determination, and this processing is repeatedly performed by the rotating electrical machine ECU 23 at a predetermined cycle.

In FIG. 4, in step S11, the detection current Ia detected by the current sensor 27 is acquired. In a succeeding step S12, it is determined whether or not a flag indicating occurrence of overcurrent in the inverter 22 is zero. If the flag = 0, the process proceeds to step S13 to determine whether or not the detected current Ia is equal to or greater than a predetermined first threshold value TH1. The first threshold value TH1 corresponds to an “overcurrent threshold value”, for example, TH1 = 400A. If the detected current Ia is less than the first threshold value TH1, this process is terminated as it is. If the detected current Ia is greater than or equal to the first threshold value TH1, the process proceeds to step S14, where the flag is set to 1, and the process is terminated.

After 1 is set in the flag, step S12 is denied and the process proceeds to step S15. In step S15, it is determined whether or not the detected current Ia is less than a predetermined second threshold value TH2. The second threshold value TH2 is determined as a current value smaller than the first threshold value TH1, for example, TH2 = 200A.

If the detected current Ia is greater than or equal to the second threshold value TH2, this process is terminated. On the other hand, if the detected current Ia is less than the second threshold value TH2, the process proceeds to step S16, an overcurrent abnormality signal is transmitted to the battery ECU 37 and the engine ECU 40 using the communication line 41, and then this process ends.

FIG. 5 is a flowchart showing an abnormality monitoring processing procedure, and this processing is repeatedly performed by the engine ECU 40 at a predetermined cycle.

In FIG. 5, in step S <b> 21, it is determined whether an overcurrent abnormality signal is received from the rotating electrical machine ECU 23. If an overcurrent abnormality signal has been received, the process proceeds to step S 22, and a forced opening signal for the switches 31 and 32 is transmitted to the battery ECU 37 using the communication line 41.

FIG. 6 is a flowchart showing a processing procedure of fail-safe control in the battery unit U, and this processing is repeatedly performed by the battery ECU 37 at a predetermined cycle.

In FIG. 6, in step S31, it is determined whether or not an overcurrent abnormality signal is received from the rotating electrical machine ECU. If an overcurrent abnormality signal has been received, the process proceeds to step S32 to instruct to turn off (open) the switches 31 and 32 as fail-safe processing. Note that the bypass switch 36 remains open.

If the overcurrent abnormality signal has not been received, the process proceeds to step S33, and it is determined whether or not a forced release signal has been received from the engine ECU 40. If the forced release signal has been received, the process proceeds to step S32, and a fail safe process is performed. In this case, according to steps S31 to S33, the fail-safe process is performed based on the first received signal among the overcurrent abnormality signal from the rotating electrical machine ECU 23 and the forced release signal from the engine ECU 40.

Next, the processing when an overcurrent occurs in the inverter 22 will be specifically described with reference to the time chart of FIG.

In FIG. 7, before the timing t <b> 1, the switches Sp and Sn of the inverter 22 are turned on / off in response to an operation request of the rotating electrical machine 21, and an energization current corresponding to the operating state of the rotating electrical machine 21 flows to the inverter 22. . That is, the rotating electrical machine unit 20 is operating normally. In this state, the energization current of the inverter 22 (the detection current Ia of the current sensor 27) is less than the first threshold value TH1. At this time, in the battery unit U, the switches 31 and 32 are in a closed state (only one is open depending on the situation).

Then, at timing t1, for example, when the energizing current of the inverter 22 increases rapidly due to the occurrence of a short circuit in the inverter 22, the energizing current exceeds the first threshold value TH1 at timing t2. As a result, 1 is set in the flag. At this time, when an overcurrent flows through each of the switches Sp and Sn, the narrow portion 52a of the lead portion 52 in the switch module 50 is melted, and the energization current is suddenly reduced accordingly.

Thereafter, when the energization current becomes less than the second threshold value TH2 at timing t3, the rotating electric machine ECU 23 outputs an overcurrent abnormality signal. At timing t4, the battery ECU 37 of the battery unit U recognizes that an overcurrent has occurred in the rotating electrical machine unit 20 based on the reception of the overcurrent abnormality signal, and accordingly, the fail safe process, that is, the switches 31 and 32 are switched. Forced release is performed.

In this case, at time t4, the energization current is suppressed to a small current, and the switches 31 and 32 can be preferably opened while protecting the switch. That is, if the switches 31 and 32 of the energization path are opened under an overcurrent condition, a surge current is generated in the energization path, and the switches 31 and 32 may be damaged due to the surge current. Is done. In this respect, according to the above-described configuration, the switches 31 and 32 are opened in a state where the overcurrent has been temporarily stopped. Therefore, the surge current when the switch is opened is suppressed, and further, the switch breakage due to the surge current is suppressed.

In the present embodiment, the switches 31 and 32 are forcibly opened as fail-safe processing, and the bypass switch 36 is kept open, but instead, the switches 31 and 32 are forcibly opened as fail-safe processing. In addition, the bypass switch 36 may be closed. When the bypass switch 36 is kept open, the lead storage battery 11 and the inverter 22 are completely cut off by opening the switches 31 and 32. On the other hand, when the bypass switch 36 is closed, the lead storage battery 11 and the inverter 22 are connected via the fuse 35.

Here, the engine ECU 40 recognizes that an overcurrent has occurred based on the reception of the overcurrent abnormality signal at timing t4 (possibly before and after that), and accordingly, a forced release signal is transmitted to the battery ECU 37. Therefore, in the configuration in which the fail safe process is performed in the battery unit U after waiting for a command from the engine ECU 30 as the host ECU, the fail safe process is performed at a timing later than the timing t4. Since the battery ECU 37 performs the fail-safe process based on the overcurrent abnormality signal from the rotating electrical machine ECU 23 without waiting for the reception of the forcible opening signal from the engine ECU 40, it is possible to perform an early treatment.

Next, inrush current limiting processing at the start of powering drive of the rotating electrical machine 21 will be described. FIG. 8 is a flowchart showing a processing procedure of powering drive control of the rotating electrical machine 21, and this process is repeatedly performed by the rotating electrical machine ECU 23 at a predetermined cycle.

In FIG. 8, in step S41, it is determined whether or not there is a request for powering drive. For example, it is determined that there is a request for powering drive at the time of engine restart or power assist. If there is a request for power running, the process proceeds to the subsequent step S42, and if there is no request, the process is terminated.

In step S42, the target value of the inverter energization current is set according to the drive mode required for the rotating electrical machine 21. At this time, if the engine is restarted, for example, the target value of the inverter energization current is set based on the initial rotation speed (cranking speed) for engine restart. In addition, during power assist, a target value for the inverter energization current is set based on the assist amount corresponding to the accelerator operation amount.

In step S43, it is determined whether or not the rotational speed Nm of the rotating electrical machine 21 is less than a predetermined rotational speed Nth. The predetermined rotation speed Nth is a determination value for determining that the neutral point voltage has risen above a predetermined level by the motor electromotive force in the rotating electrical machine 21, and is, for example, Nth = 600 rpm. The pulley ratio between the engine output shaft and the output shaft of the rotating electrical machine 21 is, for example, 2.3. Then, the process proceeds to step S44 on condition that Nm <Nth.

In step S44, the target value of the inverter energization current is limited by a predetermined limit value Ix in order to limit the inrush current at the beginning of the power running drive of the rotating electrical machine 21. The limit value Ix is a value smaller than the first threshold value TH1 for overcurrent determination in the inverter 22, and is, for example, Ix = 300A. In this case, the limit value Ix can also be set according to whether the current powering drive request is an engine restart request or a power assist request. For example, if it is an engine restart request, the limit value Ix is set to a smaller value than in the case of a power assist request.

Further, when the rotational speed Nm increases after the start of the driving of the rotating electrical machine 21 and Nm <Nth, the process proceeds to step S45. In step S45, the restriction of the inrush current is released.

In steps S44 and S45, in step S46, feedback control is performed on the inverter energization current. At this time, the control duty is calculated based on the deviation between the target value of the inverter energization current and the actual value (detected current Ia), and the switching control is performed on each of the switches Sp and Sn of the inverter 22 based on the control duty.

The detection current Ia of the inverter energization current may be other than the detection current of the current sensor 27 provided in the power line of the inverter 22, and is provided between the inverter 22 and each phase winding 24U, 24V, 24W. The detected current of the current sensor 27a or the detected current of the current sensor 27b provided for each phase between the lower arm switch Sn and the ground line may be used (see FIG. 2).

FIG. 9 is a time chart showing more specifically current control at the beginning of powering drive of the rotating electrical machine 21. Here, the engine restart will be described.

In FIG. 9, at timing t11, a request for powering driving of the rotating electrical machine 21 (engine restart request) occurs, and energization of the inverter 22 is started accordingly. Here, first, the target value of the inverter energization current is limited by the limit value Ix, and feedback control of the inverter energization current is performed using the Ix as the target value. At this time, since the inverter energization current is limited to a value smaller than the first threshold value TH1 for overcurrent determination, erroneous determination that an overcurrent has flowed due to an inrush current is suppressed. If feedback control is performed without limiting the current, the switches Sp and Sn are energized with 100% duty, and a large inrush current flows at that time.

Thereafter, when the rotational speed Nm of the rotating electrical machine 21 gradually increases and the rotational speed Nm reaches the predetermined rotational speed Nth at timing t12, the current limitation in the inverter 22 is released. At the timing t12, the cause of the inrush current disappears, and the cause of erroneous determination of overcurrent is also eliminated. That is, as shown in the figure, even if the switches Sp and Sn are energized with 100% duty, the overcurrent is not erroneously determined. After timing t2, feedback control of the inverter energization current is performed according to the drive mode required for the rotating electrical machine 21.

According to the embodiment described above in detail, the following excellent effects can be obtained.

When a large current flows as an inrush current at the beginning of powering drive of the rotating electrical machine 21, it is regarded as an overcurrent, and there is a concern that a short circuit abnormality may be erroneously determined. In this regard, in the above configuration, since the inrush current generated at the start of powering driving of the rotating electrical machine 21 is limited, the inrush current is suppressed from being regarded as an overcurrent, and as a result, a short circuit abnormality (that is, an overcurrent) An erroneous determination of (abnormal) is suppressed.

In the configuration in which the energization current of the inverter 22 is feedback-controlled, the inrush current is limited by limiting the target value of the energization current at the start of powering driving of the rotating electrical machine 21. In this case, the duty ratio of the switches Sp and Sn can be reduced by limiting the target value of the inverter energization current. Therefore, the inrush current can be suitably limited at the start of powering drive of the rotating electrical machine 21.

The target value of the energizing current is set as a value smaller than the overcurrent threshold (TH1). As a result, a configuration suitable for distinguishing between inrush current and overcurrent can be realized.

The restriction of the inrush current is released according to the rotation increase of the rotating electrical machine 21 after the start of the power running drive of the rotating electrical machine 21. Thereby, after starting the power running drive of the rotating electrical machine 21, the limitation of the inrush current can be released in accordance with the increase of the neutral point voltage due to the motor electromotive force, and the current limitation can be appropriately performed according to necessity. .

When the engine is restarted with the idling stop control, the rotating electrical machine 21 is driven by power running from the engine stopped state, so it is considered that the inrush current tends to increase. In this respect, since the inrush current is limited at the time of starting the power running drive of the rotating electrical machine 21 in response to the engine restart request, the inrush current and the overcurrent can be suitably distinguished at the time of the engine restart. .

In the configuration in which the interrupting part (the narrow part 52a) is provided in the switch module 50 in the inverter 22, there is a concern that the interrupting part may be interrupted unintentionally due to the inrush current flowing. In this respect, since the inrush current is limited at the time of starting the power running drive of the rotating electrical machine 21 as described above, it is possible to suppress the inconvenience that the interrupting part is interrupted unintentionally.

In the configuration in which the narrow portion 52a of the lead portion 52 in the switch module 50 is blown when an overcurrent flows through the rotating electrical machine 21 or the inverter 22, the narrow portion after the energizing current once rises when an overcurrent abnormality occurs. It decreases at once due to the interruption of the route by fusing 52a. Considering such an aspect, in the above configuration, an overcurrent has flowed based on the results of the first determination that the inverter energization current has increased to the first threshold value TH1 and the second determination that the current has subsequently decreased. And the switches 31 and 32 are opened based on the determination result. In this case, the energization current can be suitably cut off while suppressing the surge current generated when the switches 31 and 32 are opened. As a result, it is possible to optimize the treatment when an overcurrent occurs.

As the second determination that the current has decreased after the inverter energization current has increased to the first threshold TH1, it is determined that the energization current has decreased to the second threshold TH2 that is smaller than the first threshold TH1. Thereby, when short circuit abnormality arises in the rotary electric machine 21 or the inverter 22, the current rise accompanying generation | occurrence | production of overcurrent and the current fall accompanying path | route interruption | blocking can be determined reliably. Thereby, switch opening treatment can be implemented appropriately.

The rotating electrical machine ECU 23 transmits a determination signal (overcurrent abnormality signal) indicating the result of the overcurrent determination to the battery ECU 37, and the battery ECU 37 opens the switches 31 and 32 based on the determination signal from the rotating electrical machine ECU 23. It was. In this case, the battery ECU 37 directly receives the determination signal from the rotating electrical machine ECU 23, so that emergency treatment based on the determination signal can be performed.

In particular,
(1) The rotating electrical machine ECU 23 transmits a determination signal (overcurrent abnormality signal) indicating the result of the overcurrent determination to the battery ECU 37 and the engine ECU 40,
(2) Based on the determination signal received from the rotating electrical machine ECU 23, the engine ECU 40 transmits a forced opening signal for forcibly opening the switches 31 and 32 to the battery ECU 37,
(3) The battery ECU 37 is configured to forcibly open the switches 31 and 32 based on the earlier one of reception of the determination signal from the rotating electrical machine ECU 23 and reception of the forced opening signal from the engine ECU 40.

Therefore, the battery ECU 37 can directly receive the determination signal from the rotating electrical machine ECU 23 without waiting for the reception of the forced release signal from the engine ECU 40 which is the host ECU, and can perform an emergency treatment based on the determination signal. . In addition to being able to respond quickly by the battery ECU 37, it is possible to respond with high reliability by the engine ECU 40. The battery ECU 37 performs local arithmetic processing that controls charging / discharging of the

storage batteries

11 and 12, whereas the engine ECU 40 comprehensively manages other ECUs. Therefore, according to the engine ECU 40, it is possible to implement a response with high certainty (also referred to as reliability).

In the inverter 22, the narrow portion 52 a of the lead portion 52 in the switch module 50 is used as a “blocking portion”. Therefore, when an overcurrent flows through the inverter 22, a rapid overcurrent treatment can be performed.

(Other embodiments)
You may change the said embodiment as follows, for example.

-After the start of the power running drive of the rotating electrical machine 21, the degree of restriction of the inrush current may be changed in accordance with the rotation increase of the rotating electrical machine 21. For example, the rotating electrical machine ECU 23 sets a limit value of the target energization current using the relationship of FIG. 10 in step S44 of FIG. In FIG. 10, a relationship is set such that the limit value increases as the rotational speed Nm of the rotating electrical machine 21 increases (that is, a large target energization current is allowed). However, the relationship between the rotational speed Nm and the limit value may be other than that shown in FIG. According to this configuration, it is possible to appropriately limit the current according to the state of the rotating electrical machine 21.

When the inrush current is limited at the time of starting the power running drive of the rotating electrical machine 21, both the switches 31 and 32 may be turned on (closed). In this case, the rotating electrical machine ECU 23 performs powering drive control of the rotating electrical machine 21 based on FIG. Note that the processing in FIG. 11 is performed in place of FIG. 8, and the same processing as in FIG. 8 is given the same step number and description thereof is omitted as appropriate.

In FIG. 11, when it is determined that there is a request for powering drive and the rotational speed Nm of the rotating electrical machine 21 is less than the predetermined rotational speed Nth (when steps S41 and S43 are YES), the rotating electrical machine is determined in step S44. The inrush current at the beginning of the 21 power running drive is limited, and both the switches 31 and 32 are turned on in the subsequent step S51. Thus, both the switches 31 and 32 are turned on under the situation where the inrush current is limited. When Nm ≧ Nth, the inrush current restriction is released (step S45). In addition, after the switches 31 and 32 are turned on, the switches 31 and 32 may be returned to the normal on / off state based on, for example, the rotation of the rotating electrical machine 21 being in a steady state. At the time of engine start, the switches 31 and 32 may be returned to the normal on / off state based on the determination of completion of engine start (engine speed has reached a predetermined speed).

When the inrush current is limited at the start of the power running drive of the rotating electrical machine 21, the power supplied to the rotating electrical machine 21 is limited, so the torque of the rotating electrical machine 21 is reduced accordingly. In this regard, according to the above configuration, current limitation is performed at the time of starting the power running drive of the rotating electrical machine 21, while power is supplied to the rotating electrical machine 21 by the

storage batteries

11 and 12 by turning on the switches 31 and 32. Is called. Therefore, it is possible to compensate the torque of the rotating electrical machine 21, and thus it is possible to optimize the power running drive of the rotating electrical machine 21 in the current limited state.

In addition, after starting the power running drive of the rotating electrical machine 21, from the state in which one of the storage batteries 11 and 12 (the lithium ion storage battery 12 in this embodiment) is connected to the inverter 22 before the release in the state where the current limitation is performed. You may make it control opening / closing of each switch 31 and 32 to make it transfer to the state which connects both the

storage batteries

11 and 12 to the inverter 22. FIG. In this case, the rotating electrical machine ECU 23 performs powering drive control of the rotating electrical machine 21 based on FIG. Note that the processing in FIG. 12 is performed in place of FIG. 8, and the same processing as in FIG. 8 is given the same step number and description thereof is omitted as appropriate.

In FIG. 12, when it is determined that there is a request for powering drive (when step S41 is YES), in step S61, it is determined whether or not the rotational speed Nm of the rotating electrical machine 21 is less than the first rotational speed Nth1. In step S62, it is determined whether or not the rotational speed Nm of the rotating electrical machine 21 is less than the second rotational speed Nth2. Nth1 and Nth2 have a relationship of Nth1> Nth2. For example, Nth1 = 600 rpm and Nth2 = 400 rpm. If the rotational speed Nm is less than Nth2, inrush current limiting is started in step S44. When the rotational speed Nm becomes Nth2, the switches 31 and 32 are turned on in step S63, and when the rotational speed Nm becomes Nth1, the limit of the inrush current is released in step S45. After the switches 31 and 32 are turned on, the switches 31 and 32 may be returned to the normal on / off state based on, for example, the rotation of the rotating electrical machine 21 being in a steady state (similar to FIG. 11). .

From the state in which electric power is supplied to the inverter 22 only by the lithium ion storage battery 12 (one power supply state) before the release in the state where the current limitation is performed after the power running drive of the rotating electrical machine 21 is started, both

storage batteries

11 and 12 shift to a state where power is supplied to the inverter 22 (a state where two power supplies are supplied). In this case, in the rotating electrical machine 21, it is conceivable that the torque decreases as the rotational speed increases at the beginning of driving, but torque compensation by both the

storage batteries

11 and 12 is possible even if the torque decreases. In addition, when the current limit is released, if there is a transition from the one power supply state to the two power supply state, there is a risk of voltage fluctuation, but before the current limit is released, the two power supplies are supplied from the one power supply state. By performing the transition to the state, it is possible to avoid inconvenience due to voltage fluctuation.

When the engine is started, a resonance region exists on the lower rotation side than the idle rotation speed of the engine, but the resonance region can be quickly passed by the torque compensation of the rotating electrical machine 21. Moreover, since the torque of the rotating electrical machine 21 can be ensured, the initial explosion timing can be delayed while achieving early start, and fuel efficiency can be improved.

・ When limiting the inrush current, the maximum duty ratio may be set as follows.

(1) The maximum duty ratio is set based on the inverter voltage that is the input / output voltage of the inverter 22. For example, the maximum duty ratio is set based on the inverter voltage using the relationship shown in FIG. The inverter voltage is a voltage detected by the voltage sensor 26, for example. Since the inrush current tends to increase when the inverter voltage is high, the maximum duty ratio is decreased. Conversely, when the inverter voltage is low, if the inrush current is limited too much, the engine may not be restarted, so the maximum duty ratio is increased.

(2) The maximum duty ratio is set based on the temperature of the rotating electrical machine unit 20. The temperature of the rotating electrical machine unit 20 is, for example, a stator temperature detected by the temperature sensor 29. For example, the maximum duty ratio is set based on the stator temperature using the relationship shown in FIG. When the stator temperature is low, the inrush current tends to increase, so the maximum duty ratio is decreased. Note that the switch temperature of the inverter 22 may be used instead of the stator temperature. If the switch temperature is high, the possibility of failure increases, so the maximum duty ratio should be reduced.

According to the above, it is possible to limit the current within the equipment range that the rotating electrical machine unit 20 normally has. Therefore, a suitable current limit can be implemented without increasing the cost.

In the case where the first determination that the inverter energization current has increased to the first threshold value TH1 and the second determination that the current has decreased thereafter are performed, the inverter energization current increases to the first threshold value TH1 as the second determination. Then, a second determination that the current has decreased may be performed when a predetermined time (for example, about 0.5 to 1 second) elapses.

A configuration other than the narrow portion 52a of the lead portion 52 in the switch module 50 may be used as a cutoff portion that cuts off the energization path as an overcurrent flows. For example, a fusing part such as a fuse may be provided in the energization path of the inverter 22, the energization path in the battery unit U, and other energization paths. In short, it is only necessary that a blocking portion is provided in a path connecting the

storage batteries

11 and 12 and the rotating electrical machine 21.

In place of limiting the target value of the inverter energization current at the beginning of powering drive of the rotating electrical machine 21, a limit is added to the drive duty for each of the switches Sp and Sn of the inverter 22, and the inrush current is limited accordingly. You may make it show.

· A configuration may be provided that does not include a blocking unit that blocks the energization path as an overcurrent flows. In this case, when it is determined that the inverter energization current has increased to the first threshold value TH1, it may be determined that an overcurrent abnormality has occurred.

In the configuration of FIG. 1, an electric load 14 that is a constant voltage required load is connected to the output terminal P1 side of the battery unit U, that is, the lead storage battery 11 side, and the output terminal P2 side, that is, the rotating electrical machine unit 20 side. Although the electric load 15 which is a general load is connected to the above, this may be changed. For example, the electric load 15 (general load) may be connected to the output terminal P1 side of the battery unit U, and the electric load 14 (constant voltage required load) may be connected to the output terminal P2 side.

In the above embodiment, the lead storage battery 11 is provided as the first power storage unit and the lithium ion storage battery 12 is provided as the second power storage unit, but this may be changed. As the second power storage unit, a high-density storage battery other than the lithium ion storage battery 12, for example, a nickel-hydrogen battery may be used. In addition, a capacitor can be used as at least one of the power storage units.

・ Applications other than power supply systems with two power storage units are also possible. For example, the configuration having only the lead storage battery 11 or the configuration having only the lithium ion storage battery 12 may be used as the power storage unit.

· The power supply system to which the present disclosure is applied can be used for purposes other than vehicles.

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

Claims

A rotating electrical machine (21) that enables operation of power generation and power running;
A switching circuit section (22) for energizing each phase in the rotating electrical machine by turning on and off a plurality of switching elements (Sp, Sn);
A power storage unit (11, 12) connected to the switching circuit unit;
A rotating electrical machine control device (23) applied to a power supply system comprising a switch (31, 32) provided in an electrical path between the switching circuit unit and the power storage unit,
A determination unit that determines that an overcurrent has flowed in at least one of the rotating electrical machine and the switching circuit unit, based on an increase in an energization current flowing through the switching circuit unit to a predetermined overcurrent threshold (TH1); ,
A switch control unit that opens the switch based on a determination result of the determination unit;
A current limiting unit that limits an inrush current generated at the start of powering driving of the rotating electrical machine; and
A rotating electrical machine control device comprising:
An energization control unit configured to set a target value of an energization current in the switching circuit unit, and to control on / off of the switching element based on an on / off ratio of the switching element determined according to the target value;
2. The rotating electrical machine control device according to claim 1, wherein the current limiting unit limits the inrush current by limiting the target value at the start of powering driving of the rotating electrical machine.
The rotating electrical machine control device according to claim 2, wherein the current limiter sets the target value as a value smaller than the overcurrent threshold.
4. The apparatus according to claim 1, further comprising: a limit changing unit that changes a degree of limitation of the inrush current by the current limiting unit in accordance with an increase in rotation of the rotating electrical machine after the start of powering driving of the rotating electrical machine. The rotating electrical machine control device according to 1.
5. The device according to claim 1, further comprising: a restriction releasing unit that releases the restriction of the inrush current by the current limiting unit in response to an increase in rotation of the rotating electric machine after starting the power running drive of the rotating electric machine. Rotating electrical machine control device.
The engine is automatically stopped when a predetermined automatic stop condition is satisfied, and has an idling stop control function for restarting the engine when the predetermined restart condition is satisfied after the automatic stop. Applied to the vehicle to be restarted,
6. The rotating electrical machine control device according to claim 1, wherein the current limiting unit limits the inrush current at the start of powering driving of the rotating electrical machine in response to the restart request.
7. The power supply system according to claim 1, wherein a blocking unit (52a) is provided in a path connecting the power storage unit and the rotating electrical machine to block the path as the overcurrent flows. The rotating electrical machine control device according to item.
The power storage unit includes a first power storage unit (11) and a second power storage unit (12) connected in parallel to the switching circuit unit, while the switch includes the switching circuit unit and the first power storage unit. Applied to a power supply system provided with a first switch (31) for opening and closing a path between and a second switch (32) for opening and closing a path between the switching circuit unit and the second power storage unit,
8. The switch controller according to claim 1, wherein the first switch and the second switch are both closed when the current limiting is performed by the current limiting unit at the start of powering driving of the rotating electrical machine. The rotating electrical machine control device according to item 1.
In accordance with the increase in rotation of the rotating electrical machine after the start of powering drive of the rotating electrical machine, a limit release unit that releases the restriction of the inrush current by the current limiting unit,
The switch control unit connects one of the first power storage unit and the second power storage unit to the switching circuit unit after the start of powering driving of the rotating electrical machine and before the restriction release by the limit release unit. The rotating electrical machine control according to claim 8, wherein opening and closing of the first switch and the second switch is controlled so as to shift both the first power storage unit and the second power storage unit to a state of connecting to the switching circuit unit. apparatus.