JP2019022334A - Abnormality determination device of rotary electric machine - Google Patents

Abstract

To provide an abnormality determination device of a rotary electric machine, which can correctly determine power generation abnormality.SOLUTION: A power system includes: a rotary electric machine 21 which enables power generation by the motive power of an engine 25; an inverter 22 which power converts the generated power of the rotary electric machine 21; a lead-acid battery 11 which is charged by a current output from the inverter 22; and an electric load 14 which is connected to an electric path connecting the inverter 22 to the lead-acid battery 11, so as to be driven by power supply from the electric path. A current sensor 27 detects the output current of the inverter 22 at the inverter 22 side than the junction of the electric load 14 in the electric path. A rotary electric machine ECU 23 includes: a request determination unit which determines that a power generation request for the rotary electric machine 21 occurs; and an abnormality determination unit which, when the occurrence of the power generation request is determined, determines the existence or non-existence of the power generation abnormality on the basis of the detection current by the current sensor 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an abnormality determination device for a rotating electrical machine.

  Conventionally, for example, a technique described in Patent Document 1 is known as an abnormality determination device for a power supply device. The abnormality determination device includes a generator that generates power using engine power, a storage battery that can charge the generated power of the generator and that supplies power to an electric load, and a discharge detection unit that detects discharge from the storage battery. When the power generation instruction is given to the generator and the discharge from the storage battery is detected by the discharge detection unit, it is determined that there is an abnormality in the power supply device. As the abnormality determination of the power supply device, the abnormality of the power transmission member that transmits power to the generator and the abnormality of the electric wire connecting the generator and the storage battery are determined.

JP 2017-95004 A

  By the way, in a power supply system including a storage battery and a rotating electrical machine (generator), it is conceivable to determine the power generation abnormality by using the rotating electrical machine or the inverter (power conversion unit) as an abnormality determination target. That is, if any abnormality occurs in the rotating electrical machine or the inverter, proper power generation is not performed, and there is a concern that the storage battery is poorly charged. For this reason, it is desirable to properly grasp the occurrence of power generation abnormality.

  Here, when power generation abnormality occurs in the rotating electrical machine or the inverter, as described in Patent Document 1, the discharge from the storage battery is discharged by the discharge detection unit under a state in which the power generation instruction is given to the rotating electrical machine. It may be detected. Therefore, it is possible to determine that a power generation abnormality has occurred based on a state in which power generation is instructed to the rotating electrical machine and discharge from the storage battery is detected by the discharge detection unit.

  However, when an electrical load is connected to the storage battery, it is considered that the storage battery may be discharged by supplying power to the electrical load even though the power generation by the rotating electrical machine or the inverter is normal. That is, if the current consumption of the electric load is larger than the generated current, it is considered that the storage battery can be discharged even during normal power generation. For this reason, there is a concern that it is erroneously determined that the power generation is abnormal even though it is normal. Therefore, there is room for improvement as a technique for determining power generation abnormality.

  The present invention has been made in view of the above problems, and a main object thereof is to provide an abnormality determination device for a rotating electrical machine that can appropriately determine an abnormality in power generation.

  Hereinafter, means for solving the above-described problems and the effects thereof will be described.

In the first means,
A rotating electrical machine that enables power generation by engine power, a power converter that converts power generated by the rotating electrical machine, a storage battery that is charged by a current output from the power converter, the power converter, and the power converter An electric load connected to an electric path connecting the storage batteries and driven by power feeding from the electric path;
A parameter detection unit for detecting an input / output parameter indicating an input / output of a current of the power conversion unit on a side of the power conversion unit from a connection point of the electric load in the electric path;
A request determination unit for determining that a power generation request of the rotating electrical machine has occurred;
When it is determined that the power generation request has occurred, it is determined whether or not there is a power generation abnormality in at least one of the rotating electrical machine and the power conversion unit based on the input / output parameter detected by the parameter detection unit An abnormality determination unit to perform,
Is provided.

  According to the above configuration, the input / output parameter indicating the current input / output of the power conversion unit is detected by the parameter detection unit on the power conversion unit side of the electrical load connecting point between the power conversion unit and the storage battery. The Then, during the power generation by the rotating electrical machine, that is, when it is determined that the power generation request of the rotating electrical machine has occurred, it is determined whether there is a power generation abnormality in at least one of the rotating electrical machine and the power conversion unit based on the input / output parameters. Is done. In this case, since the abnormality determination is performed based on the current flowing to the power conversion unit side from the connection point of the electric load, even if the electric load is in the driving state, it is not affected by the load driving. It is possible to properly determine the power generation abnormality. In other words, unlike the above configuration, if the current flowing to the storage battery side from the connection point of the electrical load is detected, and abnormality determination is performed using the detected current, the current flows to the electrical load, There is a concern that the current value used for the determination may be smaller than the actual current, and there is a concern about erroneous determination caused by the current value. However, according to the configuration of this means, erroneous determination is suppressed. As a result, power generation abnormality can be determined appropriately.

  In the second means, when the abnormality determining unit determines that the power generation request has occurred, the input / output parameter detected by the parameter detecting unit causes a current to flow into the power converting unit. Is determined, it is determined that the power generation abnormality has occurred.

  When power generation abnormality occurs in a rotating electrical machine or power converter, it is considered that current may flow into the power converter (current consumption state) in spite of being in the power generation mode. It is done. In such a current inflow state, there is a concern that the supply current to the electric load is insufficient. In this regard, according to the above configuration, when the input / output parameter indicates that a current flows into the power conversion unit, that is, the current (output current) flowing to the power conversion unit side from the connection point of the electrical load is Since it is determined that a power generation abnormality has occurred when the current flows into the power conversion unit, it is possible to take appropriate measures when the abnormality occurs.

  In the third means, in the power supply system, the electrical path is provided with a switch on the power conversion unit side from the connection point of the electrical load, and the parameter detection unit is configured as the input / output parameter. A current detection unit that detects a current flowing through the switch, and the abnormality determination unit determines whether the power generation abnormality has occurred based on the current detected by the current detection unit when it is determined that the power generation request has occurred. Determine presence or absence.

  According to the above configuration, the current flowing through the switch on the power conversion unit side of the connection point of the electric load is detected by the current detection unit, and the presence or absence of power generation abnormality is determined based on the detected current. In this case, even if an abnormality occurs in the rotating electrical machine or the power converter, the information from the current detector provided separately from the rotating electrical machine or the power converter without using information from the rotating electrical machine or the power converter. Can be used to determine the presence or absence of power generation abnormality. Therefore, the reliability of abnormality determination can be improved.

  In addition, abnormality determination is performed using the detected current detected on the power conversion unit side of the connection point of the electrical load, so that power generation abnormality is appropriately determined regardless of the driving state of the electrical load as described above. it can.

  In a fourth means, the storage battery includes a first storage battery and a second storage battery connected in parallel to the power conversion unit, and the switch is provided between the power conversion unit and the first storage battery. A first detection unit configured to detect a current flowing through the first switch as the current detection unit, and the second switch provided between the power conversion unit and the second storage battery. And a second detection unit that detects a current flowing through the second switch, and the abnormality determination unit is detected by the first detection unit when it is determined that the power generation request has occurred. Based on the first detected current and the second detected current detected by the second detector, the presence or absence of the power generation abnormality is determined.

  According to the said structure, in a power supply system which has a 1st storage battery and a 2nd storage battery, power generation abnormality can be determined appropriately based on the electric current which flows into each switch provided for every storage battery.

  In the fifth means, in the power supply system, the electrical path is provided with a switch closer to the power conversion unit than the connection point of the electrical load, and the parameter detection unit is configured as the input / output parameter. A voltage detection unit that detects voltages at both ends of the switch, and the abnormality determination unit is detected by the voltage detection unit when it is determined that the power generation request is generated and the switch is in a closed state; The presence / absence of the power generation abnormality is determined based on each of the voltages.

  By acquiring the voltages at both ends of the switch (that is, the storage battery side and the power conversion unit side), it is possible to grasp whether the power conversion unit is in a current inflow state or a current outflow state. Therefore, according to the above configuration, the power generation abnormality can be appropriately determined based on the voltages at both ends of the switch (that is, the storage battery side and the power conversion unit side).

  According to a sixth means, in the power supply system, the electrical path is provided with a switch on the power conversion unit side of a connection point of the electrical load, and the rotating electrical machine having the rotating electrical machine and the power conversion unit Comprising a unit, a first terminal of the rotating electrical machine unit and a second terminal on the power conversion unit side of both sides of the switch are connected by a connection line, the parameter detection unit as the input / output parameters, A voltage detection unit that detects a voltage of the first terminal and a voltage of the second terminal, and the abnormality determination unit is detected by the voltage detection unit when it is determined that the power generation request is generated The presence or absence of the power generation abnormality is determined based on each voltage.

  In a power supply system in which the first terminal on the rotating electrical machine unit side and the second terminal on the power conversion unit side of both sides of the switch are connected by a connection line, a predetermined value corresponding to the direction of current is generated at both ends of the connection line during power generation. A voltage difference occurs. Therefore, by acquiring the voltages (first terminal voltage and second terminal voltage) at both ends of the connection line, it is possible to grasp whether the power conversion unit is in a current inflow state or a current outflow state. Therefore, power generation abnormality can be determined appropriately.

  In the seventh means, in the power supply system, the electrical path is provided with a switch closer to the power conversion unit than a connection point of the electrical load, and the electrical path is more than the switch in the electrical path. A first load is connected to the first connection point on the storage battery side, and a second load is connected to a second connection point on the power conversion unit side of the switch in the electrical path, and the parameter detection unit is The input / output parameter is detected on the power conversion unit side of the first connection point, and the abnormality determination unit uses the input / output parameter as a condition that the second load is stopped. Based on this, the presence or absence of the power generation abnormality is determined.

  According to the above configuration, in the power supply system in which the first load is connected to the first connection point closer to the storage battery than the switch, and the second load is connected to the second connection point closer to the power conversion unit than the switch, The parameter detection unit detects the input / output parameter on the power conversion unit side of the first connection point, and performs abnormality determination based on the input / output parameter on the condition that the second load is in a stopped state. In this case, even if the electric load is connected to both sides of the switch (that is, the storage battery side and the power conversion unit side) in the power supply system, the electric load (second load) on the power conversion unit side is in a stopped state. This makes it possible to determine whether power generation is appropriate.

The electric circuit diagram which shows the power supply system of 1st Embodiment. The flowchart which shows the process sequence of electric power generation abnormality determination. The electric circuit diagram which shows the power supply system of 2nd Embodiment. The flowchart which shows the process sequence of power generation abnormality determination in 2nd Embodiment. The electric circuit diagram which shows the power supply system of 3rd Embodiment. The flowchart which shows the process sequence of power generation abnormality determination in 3rd Embodiment. The electric circuit diagram which shows the power supply system of 4th Embodiment. The flowchart which shows the process sequence of electric power generation abnormality determination in 4th Embodiment. The electric circuit diagram which shows the power supply system of 5th Embodiment. The flowchart which shows the process sequence of power generation abnormality determination in 5th Embodiment.

  Hereinafter, embodiments 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. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings, and the description of the same reference numerals is used.

(First embodiment)
As shown in FIG. 1, this power supply system is a dual power supply system having a lead storage battery 11 as a first storage battery and a lithium ion storage battery 12 as a second storage battery. Each storage battery 11, 12 can supply power to the starter 13, various electric loads 14, 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 a specific description by illustration is omitted, the lithium ion storage battery 12 is housed in a housing case and configured as a part of a battery unit 30 integrated with a substrate. The battery unit 30 has output terminals P1, P2, P3, P4, of which the lead storage battery 11, the starter 13, and the electric load 14 are connected to the output terminals P1, P4, and the rotating electrical machine unit is connected to the output terminal P2. 20 is connected, and the electrical load 15 is connected to the output terminal P3.

  The electric loads 14 and 15 have different requirements for the voltage of the supplied power supplied from the storage batteries 11 and 12. Among these, the electric load 15 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 14 is a general electric load other than the constant voltage request load. It can be said that the electric load 15 is a protected load. In addition, it can be said that the electric load 15 is a load that does not allow a power supply failure, and the electric load 14 is a load that allows a power supply failure compared to the electric load 15.

  Specific examples of the electric load 15 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 15 may include a travel system actuator such as an electric steering device or a brake device. Specific examples of the electric load 14 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. Note that a traveling system actuator such as the above-described electric steering device or brake device may be provided as the electric load 14 instead of the electric load 15.

  The rotating electrical machine unit 20 includes a rotating electrical machine 21 that is a three-phase AC motor, an inverter 22 connected to each phase winding of the rotating electrical machine 21, and a rotating electrical machine ECU 23 that controls the operation of the rotating electrical machine 21 by energization control of the inverter 22. And a power generation function for generating power by rotating the engine output shaft and the axle, and a power running function for applying a rotational force to the engine output shaft. The rotating electrical machine unit 20 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). The rotating electrical machine 21 is drivingly connected to the output shaft (crankshaft) of the engine 25 by a connecting member comprising a belt and a pulley, and the rotation is transmitted between the rotating electrical machine 21 and the engine 25.

  Although not shown because of a well-known configuration, the inverter 22 is configured as a power conversion unit (switching circuit unit) having a plurality of semiconductor switching elements. The inverter 22 converts a three-phase alternating current output from the rotating electrical machine 21 during power generation into a direct current, and charges the storage batteries 11 and 12 with the direct current. Further, the inverter 22 converts a direct current into a three-phase alternating current during power running, and drives the rotating electrical machine 21 by the three-phase alternating current.

  The rotating electrical machine ECU 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine ECU 23 controls on / off of the switching element of each phase of the inverter 22 according to the energization phase, and controls the energization current by adjusting the on / off ratio (for example, duty ratio) when energizing each phase coil.

  The rotating electrical machine unit 20 and the battery unit 30 are connected by a connection line 26 provided between the output terminal P11 on the rotating electrical machine unit 20 side and the output terminal P2 on the battery unit 30 side. Electric power enters and exits the rotating electrical machine unit 20. The connection line 26 is provided with a current sensor 27 that detects current. The output terminal P11 on the rotating electrical machine unit 20 side corresponds to the “first terminal”, and the output terminal P2 on the battery unit 30 side corresponds to the “second terminal”. It is also possible to provide the current sensor 27 in the rotating electrical machine unit 20, that is, between the output terminal P <b> 11 and the inverter 22.

  Next, the electrical configuration of the battery unit 30 will be described.

  The battery unit 30 has a first electric path L1 that connects the output terminal P1 and the lithium ion storage battery 12 as an in-unit electric path, and outputs to a connection point N1 that is an intermediate point of the first electric path L1. Terminal P2 is connected. The first electrical path L1 is a path that electrically connects the lead storage battery 11 and the lithium ion storage battery 12, and the rotating electrical machine unit 20 is connected to a connection point N1 on the first electrical path L1. In the first electrical path L1, the first switch SW1 is provided on the lead storage battery 11 side of the connection point N1, and the second switch SW2 is provided on the lithium ion storage battery 12 side of the connection point N1. That is, the first switch SW1 is provided between the inverter 22 and the lead storage battery 11, and the second switch SW2 is provided between the inverter 22 and the lithium ion storage battery 12. The electrical path between the first electrical path L1 and N1-P2 is a large current path assuming that an input / output current flows to the rotating electrical machine unit 20, and the storage batteries 11 and 12 and the rotating electrical machine are connected via this path. Mutual energization between the units 20 is performed.

  The first electric path L1 includes a second electric path between a branch point N3 between the output terminal P1 and the first switch SW1 and a branch point N4 between the second switch SW2 and the lithium ion storage battery 12. L2 is provided in parallel, and an output terminal P3 is connected to a connection point N2 that is an intermediate point of the second electric path L2. In the second electrical path L2, the third switch SW3 is provided closer to the lead storage battery 11 than the connection point N2, and the fourth switch SW4 is provided closer to the lithium ion storage battery 12 than the connection point N2. The electrical path between the second electrical path L2 and N2-P3 is a small current path that is assumed to flow a small current compared to the first electrical path L1 side (that is, an allowable current compared to the first electrical path L1). A small small current path), and the electric load 15 is energized from each of the storage batteries 11 and 12 through this path.

  The electrical load 15 of the electrical loads 14 and 15 is a load electrically connected to the lead storage battery 11 when the third switch SW3 is turned on, whereas the electrical load 14 is connected to the lead storage battery 11. It can be said that the load is always connected.

  In the operating state of the power supply system, the first switch SW1 and the second switch SW2 are selectively operated to be in a closed state, whereby at least one of the lead storage battery 11 and the lithium ion storage battery 12 is connected via the first electric path L1. Energization is performed with the rotating electrical machine unit 20. Further, by selectively operating the third switch SW3 and the fourth switch SW4 to the closed state, at least one of the lead storage battery 11 and the lithium ion storage battery 12 and the electrical load 15 is connected via the second electrical path L2. Energization is performed between them.

  Each of the switches SW1 to SW4 is configured using a semiconductor switching element such as a MOSFET, that is, a normally open type switch. Specifically, for example, the first switch SW1 includes a switch unit 31 composed of semiconductor switching elements connected in series with the directions of the parasitic diodes reversed, and a semiconductor connected in series with the directions of the parasitic diodes reversed from each other. The switch unit 32 includes a switching element, and the switch units 31 and 32 are connected in parallel. Other switches have the same configuration. That is, the second switch SW2 is configured by connecting the switch units 33 and 34 in parallel, the third switch SW3 is configured by connecting the switch units 35 and 36 in parallel, and the fourth switch SW4 is The switch units 37 and 38 are connected in parallel.

  Since each of the switch units 31 to 38 includes a pair of semiconductor switching elements that reverse the directions of the parasitic diodes, for example, when the first switch SW1 is turned off (opened), that is, each semiconductor switching element. When is turned off, current flow through the parasitic diode is completely blocked. That is, it is possible to avoid an unintentional flow of current in each of the electrical paths L1 and L2.

  In FIG. 1, the parasitic diodes are connected to each other at the anodes, but the cathodes of the parasitic diodes may be connected to each other. As the semiconductor switching element, an IGBT, a bipolar transistor, or the like can be used instead of the MOSFET. When an IGBT or a bipolar transistor is used, a diode serving as a substitute for the parasitic diode may be connected to each semiconductor switching element in parallel.

  Further, the battery unit 30 is provided with a bypass path L3 that connects the output terminal P4 and the output terminal P3, and a bypass relay 41 is provided on the bypass path L3. That is, the bypass relay 41 is provided in parallel with the third switch SW3. The bypass relay 41 is a normally closed mechanical relay switch. A fuse 42 is provided on the extended line of the bypass path L3. Note that the fuse 42 may be provided in the bypass path L3 inside the unit. By closing the bypass relay 41, the lead storage battery 11 and the electrical load 15 are electrically connected even if the third switch SW3 is off. For example, in a state where an IG switch (ignition switch) that is a power switch of the vehicle is turned off, each of the switches SW1 to SW4 is turned off (closed), and in this state, the electric load 15 is connected via the bypass relay 41. On the other hand, dark current is supplied.

  The battery unit 30 includes a battery ECU 50 that controls on / off (opening / closing) of the switches SW <b> 1 to SW <b> 4 and the bypass relay 41. The battery ECU 50 is constituted by a microcomputer including a CPU, ROM, RAM, input / output interface, and the like. The battery ECU 50 controls on / off of the switches SW1 to SW4 and the like based on the storage state of each of the storage batteries 11 and 12 and a command from another ECU such as the engine ECU 60. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery ECU 50 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.

  In this system, a communication network such as CAN is constructed, and the communication network enables mutual communication between various ECUs. A rotating electrical machine ECU 23, a battery ECU 50, an engine ECU 60, and the like are connected to the communication network. The engine ECU 60 is a host control device that manages the rotating electrical machine ECU 23 and the battery ECU 50 in an integrated manner, and includes a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The engine ECU 60 controls the operation of the engine 25 based on the engine operating state and the vehicle traveling state each time. The engine 25 is an internal combustion engine such as a gasoline engine or a diesel engine that generates torque by burning fuel.

  By the way, if a power generation abnormality occurs in at least one of the rotating electric machine 21 and the inverter 22 in the rotating electric machine unit 20, the driving of the electric loads 14 and 15 and the charging of the storage batteries 11 and 12 are adversely affected. If this happens, it is desirable to properly grasp it. Further, when a power generation abnormality occurs, the output current of the inverter 22 may not be an appropriate value, and it is desirable to correctly recognize the power generation abnormality based on the output current. Here, the electric load 14 is connected to the electric path connecting the lead storage battery 11 and the inverter 22, and in other words, even when the electric load 14 is driven, power supply to the electric load 14 is performed. It is necessary to correctly determine whether or not power generation is abnormal even in a situation where power is lost.

  Therefore, in the present embodiment, when the current flowing through the connection line 26 is detected by the current sensor 27 as an input / output parameter indicating the input / output of the current of the inverter 22, 27 is configured to determine the presence or absence of power generation abnormality based on the detected current of 27. In the present embodiment, the current sensor 27 corresponds to a parameter detection unit. According to the current sensor 27, the input / output parameter indicating the input / output of the current of the inverter 22 on the inverter 22 side from the connection point (X1 in FIG. 1) of the electric load 14 in the electric path connecting the lead storage battery 11 and the inverter 22. Can be detected.

  As the power generation abnormality, it is considered that a power generation insufficiency abnormality in which the amount of power generated by the rotating electrical machine 21 becomes excessive, or a current inflow abnormality in which a current flows into the inverter 22 when a power generation request is made. Therefore, in this embodiment, the power generation insufficiency abnormality and the current inflow abnormality are respectively determined. In the rotating electrical machine unit 20, for example, if the rotor rotational position of the rotating electrical machine 21 is erroneously detected by a rotor position detection unit such as a resolver, there is a possibility that a deviation occurs in the energization phase of the three-phase current with respect to the rotor rotational position. As a result, there is a concern that power generation shortage abnormality or current inflow abnormality may occur in the power generation mode in which the rotating electrical machine 21 should generate power.

  FIG. 2 is a flowchart showing a processing procedure for power generation abnormality determination, and this processing is performed by the rotating electrical machine ECU 23 at a predetermined cycle.

  In FIG. 2, in step S <b> 11, it is determined whether or not a power generation request for causing the rotating electrical machine unit 20 to generate power is generated, that is, whether or not it is in the power generation mode. At this time, in the engine rotation state where the engine rotation speed is equal to or higher than the idle rotation speed, for example, based on the fact that regenerative power generation is possible in the vehicle deceleration state or the battery SOC decreases below a predetermined value. Is to occur.

  If step S11 is YES, the process proceeds to step S12, and the output current Iout detected by the current sensor 27 is acquired. The output current Iout is a current that is positive in the direction output from the inverter 22, and in particular from the connection point X <b> 1 with the electric load 14 in the electric path connecting the rotating electrical machine unit 20 (inverter 22) and the storage batteries 11 and 12. Is also a current flowing to the rotating electrical machine unit 20 side.

  Thereafter, in step S13, it is determined whether or not the output current Iout is greater than or equal to the first threshold value TH1. The first threshold value TH1 is determined with reference to a normal generated current in the rotating electrical machine unit 20, and is a positive current value lower than the generated current. When Iout ≧ TH1, the process proceeds to step S14 to determine that normal power generation is being performed.

  If Iout <TH1, the process proceeds to step S15 to determine whether or not the output current Iout is equal to or greater than the second threshold value TH2. The second threshold value TH2 is a current value lower than the first threshold value TH1, particularly zero or a negative current value. When Iout ≧ TH2, the process proceeds to step S16, and when Iout <TH2, the process proceeds to step S17.

  In step S16, although current outflow (power generation) is being performed in the rotating electrical machine unit 20, it is determined that the output current Iout is too small and that it is a power generation abnormality. At this time, it may be determined that the power generation is insufficient. Further, in step S17, it is determined that a power generation abnormality has occurred, assuming that a current inflow has occurred in the rotating electrical machine unit 20 instead of a current outflow. At this time, it may be determined that the current inflow is abnormal. In steps S16 and S17, it is determined that both are power generation abnormalities, but the fail safe processing may be different.

  For example, in step S16, since the power generation is performed at the abnormal level, the power generation amount in the rotating electrical machine unit 20 may be limited (fail-safe process 1). In step S17, the operation of the rotating electrical machine unit 20, that is, power generation may be prohibited (fail-safe process 2). When the current inflow abnormality is detected, the operation of the rotating electrical machine unit 20 is stopped, so that the inconvenience that the supply current to the electric load 14 becomes too small or the storage amount of the lead storage battery 11 is accelerated is suppressed. The

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

  During power generation by the rotating electrical machine 21, that is, when it is determined that a power generation request from the rotating electrical machine 21 has occurred, the inverter 22 side is more on the electrical path connecting the inverter 22 and the lead storage battery 11 than the connection point X1 of the electrical load 14. On the basis of the detected current, the presence or absence of power generation abnormality is determined. In this case, since the abnormality determination is performed by the current flowing from the connection point X1 of the electric load 14 to the inverter 22 side, even if the electric load 14 is in a driving state, it is not affected by the load driving. A power generation abnormality can be properly determined. In other words, unlike the above configuration, if a current flowing to the lead storage battery 11 side from the connection point X1 of the electrical load 14 is detected and abnormality determination is performed using the detected current, the current is supplied to the electrical load 14. By flowing, the current value used for the abnormality determination may be smaller than the actual output current, and there is a concern about erroneous determination caused by the current value. However, according to the above configuration, erroneous determination is suppressed. As a result, power generation abnormality can be determined appropriately.

  As a power generation abnormality, it is determined that the current is flowing into the inverter 22 (current consumption state) despite the power generation mode. As a result, it is possible to quickly take appropriate measures when an abnormality occurs.

  Hereinafter, embodiments other than those described above will be described focusing on differences from the first embodiment.

(Second Embodiment)
In the present embodiment, currents flowing through the switches SW1 and SW2 are acquired as input / output parameters, and the presence or absence of power generation abnormality is determined based on the currents.

  FIG. 3 is an electric circuit diagram showing the power supply system of the second embodiment. Note that the configuration of FIG. 3 is obtained by changing a part of FIG. In FIG. 3, illustration of the switches SW3 and SW4 and the bypass relay 41 is omitted for convenience.

  In FIG. 3, as a difference from FIG. 1, a current sensor 71 that detects a current flowing through the first switch SW <b> 1 and a second switch SW <b> 2 are connected to the first electric path L <b> 1 that connects the output terminal P <b> 1 and the lithium ion storage battery 12. A current sensor 72 for detecting a flowing current is provided. According to each of these current sensors 71 and 72, the inverter on the rotating electrical machine unit 20 side from the connection point X1 with the electrical load 14 in the electrical path connecting the rotating electrical machine unit 20 (inverter 22) and each of the storage batteries 11 and 12 to each other. The electric current flowing out from 22 can be detected. In the present embodiment, each of the current sensors 71 and 72 corresponds to a parameter detection unit. Further, the current sensor 71 corresponds to a first detection unit, and the current sensor 72 corresponds to a second detection unit.

  FIG. 4 is a flowchart showing a processing procedure for power generation abnormality determination, and this processing is performed at a predetermined cycle by the rotating electrical machine ECU 23 in place of the processing in FIG. In FIG. 4, the difference from the process of FIG. 2 is steps S21 and S22.

  In FIG. 4, when it is determined that a power generation request has occurred (YES in step S <b> 11), in step S <b> 21, the detected current Is <b> 1 detected by the current sensor 71 and the detected current Is <b> 2 detected by the current sensor 72. get. At this time, the detection currents Is1 and Is2 are currents in which the direction flowing from the rotating electrical machine unit 20 to the storage batteries 11 and 12 is positive. Thereafter, in step S22, the output current Iout is calculated from the detection currents Is1 and Is2. For example, Iout = Is1 + Is2. The subsequent processing is the same as in FIG. 2, and the presence or absence of power generation abnormality is determined by comparing the output current Iout with the thresholds TH1 and TH2 (steps S13 to S17).

  According to the above configuration, the power generation abnormality can be appropriately determined based on the current flowing through each of the switches SW1 and SW2 provided for each of the storage batteries 11 and 12. In this case, even if an abnormality has occurred in the rotating electrical machine 21 or the inverter 22, information from the rotating electrical machine 21 or the inverter 22 is not used, and detection information of the current sensors 71 and 72 provided separately from them is used. The presence or absence of power generation abnormality can be determined. Therefore, the reliability of abnormality determination can be improved. Further, it is possible to grasp whether the inverter 22 is in a current inflow state or a current outflow state.

(Third embodiment)
In the present embodiment, the voltages at both ends of the switches SW1 and SW2 are acquired as input / output parameters, and the presence / absence of power generation abnormality is determined based on these voltages.

  FIG. 5 is an electric circuit diagram showing the power supply system of the third embodiment. Note that the configuration of FIG. 5 is obtained by changing a part of FIG. In FIG. 5, illustration of the switches SW3 and SW4 and the bypass relay 41 is omitted for convenience.

  In FIG. 5, as a difference from FIG. 1, in the first electric path L <b> 1 connecting the output terminal P <b> 1 and the lithium ion storage battery 12, the voltage sensor 81 is provided on the output terminal P <b> 1 side (lead storage battery 11 side) of the first switch SW <b> 1. While being provided, a voltage sensor 82 is provided on the lithium ion storage battery 12 side of the second switch SW2. Further, a voltage sensor 83 is provided on the output terminal P2 side (inverter 22 side) of each switch SW1, SW2. According to each of these voltage sensors 81 to 83, the inverter on the rotating electrical machine unit 20 side from the connection point X1 with the electrical load 14 in the electrical path connecting the rotating electrical machine unit 20 (inverter 22) and each of the storage batteries 11 and 12. The electric current flowing out from 22 can be detected. In the present embodiment, these voltage sensors 81 to 83 correspond to a parameter detection unit and a voltage detection unit.

  FIG. 6 is a flowchart showing a processing procedure for power generation abnormality determination, and this processing is performed at a predetermined cycle by the rotating electrical machine ECU 23 in place of the processing in FIG. 6 is different from the process of FIG. 2 in steps S31 to S33.

  In FIG. 6, if it is determined that a power generation request has occurred (YES in step S11), in steps S31, the detection voltages Vs1, Vs2, and Vs3 detected by the voltage sensors 81 to 83 are acquired. Thereafter, in step S32, the current Is1 flowing through the first switch SW1 is calculated from the detection voltages Vs1 and Vs3, and the current Is2 flowing through the second switch SW2 is calculated from the detection voltages Vs2 and Vs3. At this time, the current Is1 is calculated based on the difference between the detection voltages Vs1 and Vs3 (= Vs3−Vs1) and the path resistance of the part including the first switch SW1 in a state where the first switch SW1 is closed. . Further, the current Is2 is calculated based on the difference between the detection voltages Vs2 and Vs3 (= Vs3−Vs2) and the path resistance of the part including the second switch SW2 in a state where the second switch SW2 is closed. If the switches SW1 and SW2 are opened, the currents Is1 and Is2 are set to zero.

  In step S33, the output current Iout is calculated from the currents Is1 and Is2. For example, Iout = Is1 + Is2. The subsequent processing is the same as in FIG. 2, and the presence or absence of power generation abnormality is determined by comparing the output current Iout with the thresholds TH1 and TH2 (steps S13 to S17).

  According to the above configuration, by acquiring the voltages on both sides of the switches SW1 and SW2, it is possible to appropriately determine the power generation abnormality based on the current flowing through the switches SW1 and SW2. At this time, it is possible to grasp whether the inverter 22 is in a current inflow state or a current outflow state. Therefore, power generation abnormality can be determined appropriately. Note that voltage sensors are generally considered to be cheaper than current sensors. Therefore, an advantageous configuration can be realized from the viewpoint of system cost.

(Fourth embodiment)
In the present embodiment, the terminal voltage of the rotating electrical machine unit 20 (voltage of the output terminal P11) and the terminal voltage of the battery unit 30 (voltage of the output terminal P2), that is, the voltages at both ends of the connection line 26 are acquired as input / output parameters. The presence or absence of power generation abnormality is determined based on these voltages.

  FIG. 7 is an electric circuit diagram showing the power supply system of the fourth embodiment. In addition, the structure of FIG. 7 changes a part of FIG. In FIG. 7, illustration of the switches SW3 and SW4 and the bypass relay 41 is omitted for convenience.

  In FIG. 7, as a difference from FIG. 1, the rotating electrical machine unit 20 is provided with a voltage sensor 91 for detecting the voltage of the output terminal P11, and the battery unit 30 is provided with a voltage sensor 92 for detecting the voltage of the output terminal P2. Is provided. According to these voltage sensors 91 and 92, the inverter on the rotating electrical machine unit 20 side from the connection point X <b> 1 to the electrical load 14 in the electrical path connecting the rotating electrical machine unit 20 (inverter 22) and the storage batteries 11 and 12. The electric current flowing out from 22 can be detected. In the present embodiment, these voltage sensors 91 and 92 correspond to a parameter detection unit and a voltage detection unit.

  FIG. 8 is a flowchart showing a processing procedure for power generation abnormality determination, and this processing is performed at a predetermined cycle by the rotating electrical machine ECU 23 in place of the processing in FIG.

  In FIG. 8, when it is determined that a power generation request has occurred (YES in step S11), terminal voltages Vp1 and Vp2 detected by the voltage sensors 91 and 92 are acquired in step S41. Thereafter, in step S42, it is determined whether or not the terminal voltage Vp1 is larger than the terminal voltage Vp2. And if it is Vp1> Vp2, it will progress to step S43 and will determine that the normal electric power generation is performed. If Vp1 ≦ Vp2, the process proceeds to step S44 to determine that a power generation abnormality has occurred.

  When the rotating electrical machine unit 20 generates power, a voltage difference corresponding to the direction of current is generated at both ends of the connection line 26. Therefore, by acquiring the voltages at both ends of the connection line 26 (the voltages at the output terminals P11 and P2), it is possible to grasp whether the inverter 22 is in a current inflow state or a current outflow state. Therefore, power generation abnormality can be determined appropriately.

(Fifth embodiment)
In the present embodiment, in the configuration in which an electrical load is connected between the rotating electrical machine unit 20 and the battery unit 30, the presence or absence of power generation abnormality is determined in association with the driving state of the electrical load.

  FIG. 9 is an electric circuit diagram showing the power supply system of the fifth embodiment. In addition, the structure of FIG. 9 changes a part of FIG. In FIG. 9, illustration of the switches SW3 and SW4 and the bypass relay 41 is omitted for convenience.

  In FIG. 9, as a difference from FIG. 1, the electric load 14 (first load) is connected to the first connection point X <b> 1 between the battery unit 30 and the lead storage battery 11, and the battery unit 30 rotates. An electrical load 17 (second load) is connected to a second connection point X2 between the electrical unit 20 and the electrical unit 20. The electric load 17 is not always driven when the vehicle is powered on (when the IG switch is turned on), but may be temporarily driven according to a driving request such as an electric radiator fan or a power window device. . The current sensor 27 is provided on the connection line 26, that is, detects the current (input / output parameter) on the inverter 22 side from the first connection point X1. In the present embodiment, it is possible to use the configurations of FIGS. 3, 5, and 7 as the configuration of the parameter detection unit.

  FIG. 10 is a flowchart showing a processing procedure for power generation abnormality determination, and this processing is performed at a predetermined cycle by the rotating electrical machine ECU 23 in place of the processing in FIG. In FIG. 10, the difference from the process of FIG. 2 is step S51.

  In FIG. 10, if it is determined that a power generation request has occurred (YES in step S11), in step S51, it is determined whether or not the electrical load 17 between the battery unit 30 and the rotating electrical machine unit 20 is in a stopped state. judge. If it is not in the stop state (that is, if it is in the drive state), this process is temporarily terminated. That is, abnormality determination is prohibited. Moreover, if it is a stop state, the process after step S12 will be implemented. The processing after step S12 is the same as that in FIG. 2, and the output current Iout is acquired, and the presence / absence of power generation abnormality is determined by comparing the output current Iout with the thresholds TH1 and TH2 (steps S12 to S17).

  According to the said structure, it was set as the structure which determines the presence or absence of an electric power generation abnormality on condition that the electric load 17 between the battery unit 30 and the rotary electric machine unit 20 is a stop state. In this case, even if the electric loads 14 and 17 are respectively connected to both sides of the first switch SW1 (that is, the lead storage battery 11 side and the inverter 22 side) in the power supply system, the electric load 17 on the inverter 22 side is stopped. It is possible to determine whether power generation is appropriate on the condition that it is in a state.

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

  In the above-described embodiment, the configuration in which the rotating electrical machine ECU 23 performs the power generation abnormality determination processing (each processing illustrated in FIG. 2 and the like) is described, but the configuration is not limited thereto. The power generation abnormality determination process may be performed by either the battery ECU 50 or the engine ECU 60.

  -In above-mentioned embodiment, although ISG which has the function of electric power generation and power running was illustrated as a rotary electric machine, it is not restricted to this, The structure using the generator (alternator) which has only an electric power generation function may be sufficient. In this case, the power conversion unit may be a rectifier circuit using a plurality of rectifier elements (diodes), for example.

  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. However, 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.

  -Application other than a power supply system having two power storage units is 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.

  For example, in FIG. 1, only the lead storage battery 11 of the two storage batteries 11 and 12 may be used, and only the switch SW1 or only the switches SW1 and SW3 of the four switches SW1 to SW4 may be used. In the configuration of FIG. 3, only the current sensor 71 of the two current sensors 71 and 72 is used. In the configuration of FIG. 5, only the voltage sensors 81 and 83 among the three voltage sensors 81 to 83 are used.

  -It is also possible to use the power supply system to which this invention is applied for uses other than a vehicle.

  DESCRIPTION OF SYMBOLS 11 ... Lead storage battery, 12 ... Lithium ion storage battery, 14 ... Electric load, 21 ... Rotary electric machine, 22 ... Inverter (electric power conversion part), 23 ... Rotary electric machine ECU, 25 ... Engine, 50 ... Battery ECU, 60 ... Engine ECU.

Claims (7)

The rotating electrical machine (21) that enables power generation by the motive power of the engine (25), a power conversion unit (22) that converts power generated by the rotating electrical machine, and a current output from the power conversion unit are charged. Applied to a power supply system comprising a storage battery (11, 12) and an electric load (14) connected to an electric path connecting the power conversion unit and the storage battery and driven by power feeding from the electric path,
Parameter detection units (27, 71, 72, 81 to 83, which detect input / output parameters indicating the input / output of current of the power conversion unit on the power conversion unit side of the electrical load from the connection point of the electrical load. 91, 92),
A request determination unit (23, 50, 60) for determining that a power generation request of the rotating electrical machine is generated;
When it is determined that the power generation request has occurred, it is determined whether or not there is a power generation abnormality in at least one of the rotating electrical machine and the power conversion unit based on the input / output parameter detected by the parameter detection unit An abnormality determination unit (23, 50, 60) to perform,
An abnormality determination device for a rotating electrical machine.   When the abnormality determination unit determines that the power generation request is generated, the input / output parameter detected by the parameter detection unit indicates that current flows into the power conversion unit. The abnormality determination device for a rotating electrical machine according to claim 1, wherein it is determined that the power generation abnormality has occurred. In the power supply system, the electrical path is provided with switches (SW1, SW2) closer to the power conversion unit than the connection point of the electrical load.
The parameter detection unit is a current detection unit (71, 72) that detects a current flowing through the switch as the input / output parameter,
3. The rotating electrical machine according to claim 1, wherein the abnormality determination unit determines whether or not there is a power generation abnormality based on a current detected by the current detection unit when it is determined that the power generation request is generated. Abnormality judgment device. As the storage battery, it has a first storage battery (11) and a second storage battery (12) connected in parallel to the power conversion unit,
As the switch, a first switch (SW1) provided between the power conversion unit and the first storage battery, and a second switch (SW2) provided between the power conversion unit and the second storage battery. Have
The current detection unit includes a first detection unit (71) for detecting a current flowing through the first switch and a second detection unit (72) for detecting a current flowing through the second switch,
The abnormality determination unit is based on the first detection current detected by the first detection unit and the second detection current detected by the second detection unit when it is determined that the power generation request has occurred. The abnormality determination device for a rotating electrical machine according to claim 3, wherein the presence or absence of the power generation abnormality is determined. In the power supply system, the electrical path is provided with switches (SW1, SW2) closer to the power conversion unit than the connection point of the electrical load.
The parameter detection unit is a voltage detection unit (81-83) that detects each voltage across the switch as the input / output parameter,
The abnormality determination unit determines whether or not there is a power generation abnormality based on each voltage detected by the voltage detection unit when it is determined that the power generation request has occurred and the switch is in a closed state. Item 3. A rotating electrical machine abnormality determination device according to Item 1 or 2. In the power supply system, the electrical path is provided with a switch (SW1) closer to the power conversion unit than the connection point of the electrical load.
A rotating electrical machine unit (20) having the rotating electrical machine and the power conversion unit; and a first terminal (P11) of the rotating electrical machine unit and a second terminal (P2) on the power conversion unit side of both sides of the switch. Are connected by a connection line (26),
The parameter detection unit is a voltage detection unit (91, 92) that detects the voltage of the first terminal and the voltage of the second terminal as the input / output parameters,
The rotation according to claim 1 or 2, wherein the abnormality determination unit determines whether or not there is a power generation abnormality based on each voltage detected by the voltage detection unit when it is determined that the power generation request has occurred. Electricity abnormality determination device. In the power supply system, the electrical path is provided with a switch (SW1) closer to the power conversion unit than the connection point of the electrical load.
As the electrical load, a first load (14) is connected to a first connection point on the storage battery side of the switch in the electrical path, and a second side of the power conversion unit side of the switch in the electrical path. A second load (17) is connected to the connection point;
The parameter detection unit detects the input / output parameter on the power conversion unit side than the first connection point,
The rotating electrical machine according to any one of claims 1 to 6, wherein the abnormality determination unit determines the presence or absence of the power generation abnormality based on the input / output parameter on the condition that the second load is in a stopped state. Abnormality judgment device.

Images