JP2019030198A - Electric power system - Google Patents

Abstract

To properly operate a rotary electric machine unit while simplifying configuration.SOLUTION: An electric power system comprises a rotary electric machine unit 20 having at least either function of electric power generation and power running, a lead battery 11 connected to the rotary electric machine unit 20 via a connection path, and a first switch SW1 provided in the connection path. In a system operation state, by turning on the first switch SW1, the lead battery 11 and the rotary electric machine unit 20 are put in a conduction state. The rotary electric machine unit 20 has a smoothing capacitor 26 connected to the connection path. A bypass path L3 is connected in parallel to the connection path to bypass the first switch SW1, and resistors 41, 42 are provided in the bypass path L3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system in which a rotating electrical machine unit and a storage battery are electrically connected.

  Conventionally, as a power supply system mounted on a vehicle or the like, a system in which a lead storage battery and a lithium ion storage battery are connected in parallel to a rotating electrical machine (for example, ISG) is known (for example, Patent Document 1). In this power supply system, a switch is provided in a connection path that connects the rotating electrical machine and each storage battery, and each storage battery is appropriately charged by the generated electric power of the rotating electrical machine, and from one of the two storage batteries to the rotating electrical machine. Power supply is possible.

  In the power supply system, the bypass path is connected in parallel so as to bypass the switch on the connection path connecting the lead storage battery and the rotating electrical machine, and a normally closed bypass relay is provided in the bypass path. Thereby, even when the switch is held in the closed state, the lead-acid battery can be charged by the rotating electrical machine via the bypass relay.

Japanese Patent Laying-Open No. 2015-149849

  By the way, in the said power supply system, elimination of a bypass relay is examined for the purpose of the simplification of a structure and cost reduction. When the bypass relay is removed, even if the lithium ion storage battery is not used in the abnormal mode, the lead storage battery should be charged by closing the switch between the lead storage battery and the rotating electrical machine as appropriate. Will be possible.

  However, if the bypass relay is eliminated, for example, the lead-acid battery and the rotating electrical machine remain disconnected when the system is stopped. In this case, the rotating electrical machine is generally provided with a smoothing capacitor for voltage smoothing. However, by eliminating the bypass relay, the charge of the smoothing capacitor is lost when the system is stopped. There is a concern that it may interfere with operation. That is, in the configuration without the bypass relay, it is considered that the smoothing capacitor is charged by the current flowing through the switch between the lead-acid battery and the rotating electrical machine at the time of starting the system. Current limitation is applied to prevent overcurrent, which hinders charging of the smoothing capacitor. Further, there is a concern that the operation of the rotating electrical machine is affected by the charging of the smoothing capacitor being hindered.

  The present invention has been made in view of the above problems, and a main object thereof is to provide a power supply system capable of appropriately operating a rotating electrical machine unit while simplifying the configuration.

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

In the first means,
A rotating electrical machine unit (20) having at least one of power generation and power running functions;
A storage battery (11) connected to the rotating electrical machine unit via a connection path;
A main switch (SW1) provided in the connection path;
A power supply system in which the storage switch and the rotating electrical machine unit are brought into conduction when the main switch is turned on in a system operating state,
The rotating electrical machine unit has a smoothing capacitor (26) connected to the connection path,
A bypass path (L3) is connected in parallel to the connection path so as to bypass the main switch, and resistors (41, 42) are provided in the bypass path.

  In the power supply system configured as described above, a bypass path that bypasses the main switch is provided in parallel to the connection path between the rotating electrical machine unit and the storage battery, and a resistor is provided in the bypass path. Therefore, even when the main switch is off (opened), power can be supplied from the storage battery to the rotating electrical machine unit via the bypass path. In this case, in particular, since the resistor is provided in the bypass path, it is possible to hold the smoothing capacitor provided in the rotating electrical machine unit in a charged state while limiting the current flowing through the bypass path. Accordingly, when the rotating electrical machine unit is activated and operated as a generator or an electric motor, the operation can be started promptly and appropriately. In addition, since a normally closed relay is not essential in the bypass route, the configuration can be simplified. As a result, the rotating electrical machine unit can be appropriately operated while simplifying the configuration.

  In the second means, a plurality of the resistors are connected in series to the bypass path.

  By connecting a plurality of resistors in series to the bypass path, even if a short failure occurs in one resistor, the current flowing through the bypass path is limited by the remaining resistor. Therefore, it is possible to regulate an excessive current flowing through the bypass path.

  In the third means, a diode (91) is connected to the resistor in series with the bypass body in an orientation in which the storage battery side is an anode and the rotating electrical machine unit side is a cathode.

  Since the diode is connected in series with the resistor in the direction in which the storage battery side is the anode and the rotating electrical machine unit side is the cathode in the bypass path, the direction of the current in the bypass path is limited. In this case, a current flow is allowed only in the direction from the storage battery to the smoothing capacitor, and inconvenience due to the backflow of the current can be suppressed.

  In the fourth means, an acquisition unit (50) for acquiring a voltage applied to the resistor as a detection voltage, and at least one of presence / absence of a short failure and an open failure of the resistor based on the detection voltage A failure determination unit (50) for determining whether or not.

  If a short circuit failure or an open failure occurs in the resistor provided in the bypass path, the smoothing capacitor cannot be charged properly. In this respect, because it is configured to determine whether there is a short circuit failure or open failure based on the detection voltage (voltage applied to the resistor), it is possible to properly grasp these failures, at the time of failure occurrence Appropriate treatment can be performed.

  In the fifth means, a first resistor (41) and a second resistor (42) are connected in series to the bypass path as the resistors, and the first resistor and the second resistor are connected to each other. Between the intermediate point and the ground, the failure detection switch (44) is connected in series with the intermediate point side and the third resistor (43) on the ground side, and the first resistor and Of the two ends of the series resistor of the second resistor, the storage battery side is the first point (N11), the rotating electrical machine unit side is the second point (N12), and between the failure detection switch and the third resistor Is the third point (N13). The acquisition unit acquires the voltage at the third point as the detection voltage when the main switch is on and the failure detection switch is on, and the main switch is off and the failure detection is performed. When the switch is on or off, the voltage at the second point is acquired as the detection voltage. Further, the failure determination unit is based on the fact that the voltage at the third point when the main switch is on and the failure detection switch is on is substantially the same as the voltage at the first point. It is determined that the first resistor or the second resistor is short-circuited, and the voltage at the second point when the main switch is off and the failure detection switch is on or off is: Based on the fact that it is substantially 0, it is determined that the first resistor or the second resistor has an open failure.

  When the first resistor or the second resistor is short-circuited, the third point between the failure detection switch and the third resistor is in a state where the main switch is on and the failure detection switch is on. Is substantially the same as the voltage at the first point. Therefore, based on the fact that the voltage at the third point obtained when the main switch is on and the failure detection switch is on is substantially the same as the voltage at the first point, the first resistor or the second resistor It is possible to properly determine that the body is short-circuited.

  Further, when the first resistor or the second resistor has an open failure, the series resistor of the first and second resistors is in a state where the main switch is off and the failure detection switch is on or off. The voltage at the second point on the rotating electrical machine unit side of both ends is substantially zero. Therefore, based on the fact that the voltage at the second point obtained when the main switch is off and the failure detection switch is on or off, the first resistor or the second resistor is open failure. Can be properly determined.

  In the sixth means, the acquisition unit acquires the voltage at the third point as the detection voltage when the main switch is on and the failure detection switch is on, and the main switch is off, When the failure detection switch is on, the voltage at the third point is acquired as the detection voltage. In addition, the failure determination unit may cause the third resistor to be short-circuited based on the fact that the voltage at the third point when the main switch is on and the failure detection switch is on is substantially zero. Based on the fact that the voltage at the third point when the main switch is off and the failure detection switch is on is substantially the same as the voltage at the first point. Then, it is determined that the third resistor has an open failure.

  When the third resistor is short-circuited, the voltage at the third point becomes substantially 0 under the condition that the main switch is on and the failure detection switch is on. Therefore, based on the fact that the voltage at the third point acquired when the main switch is on and the failure detection switch is on is appropriately zero, it is properly determined that the third resistor is short-circuited. Can be determined.

  When the third resistor has an open failure, the voltage at the third point is substantially the same as the voltage at the first point under the condition that the main switch is off and the failure detection switch is on. Therefore, based on the fact that the voltage at the third point obtained when the main switch is off and the failure detection switch is on is substantially the same as the voltage at the first point, the third resistor is open-faulted. Can be determined appropriately.

  In the seventh means, the acquisition unit acquires the voltage at the third point as the detection voltage when the main switch is on and the failure detection switch is instructed to be off, and the main switch is off. When the failure detection switch is instructed to turn on, the voltage at the third point is acquired as the detection voltage. In the failure determination unit, the voltage at the third point when the main switch is on and the failure detection switch is instructed to be off is an intermediate voltage between the voltage of the storage battery and 0V. On the basis of this, it is determined that the failure detection switch is short-circuited, and the voltage at the third point when the main switch is off and the failure detection switch is instructed to be on is approximately 0. Based on this, it is determined that the failure detection switch has an open failure.

  When the failure detection switch is short-circuited (ON failure), the voltage at the third point is between the voltage of the storage battery and 0 V under the state where the main switch is ON and the failure detection switch is commanded OFF. Intermediate voltage. Therefore, based on the fact that the voltage at the third point acquired when the main switch is on and the failure detection switch is instructed to be off is an intermediate voltage, it is appropriate that the failure detection switch is short-circuited. Can be determined.

  Further, when the failure detection switch has an open failure (off failure), the voltage at the third point becomes substantially 0 under the condition that the main switch is OFF and the failure detection switch is instructed to be ON. Therefore, based on the fact that the voltage at the third point acquired when the main switch is off and the failure detection switch is instructed to turn on is appropriate, it is determined that the failure detection switch is in an open failure state. Can be determined.

  In the eighth means, when the smoothing capacitor is charged by energization through the bypass path, the acquisition unit uses the voltage on the rotating electrical machine unit side of both ends of the resistor as the detection voltage. get. The failure determination unit measures the time required for charging the smoothing capacitor based on the voltage on the rotating electrical machine unit side, and the resistor is short-circuited based on the time required. Judge that.

  If the resistor connected in parallel to the main switch is short-circuited, when the smoothing capacitor is charged by energization through the bypass path, the time required for the charging is shortened compared with the normal time. The completion of charging of the smoothing capacitor can be determined based on the voltage on the rotating electrical machine unit side of both ends of the resistor. Therefore, when the smoothing capacitor is charged by energization through the bypass path, the resistor is short-circuited based on the charging time measured based on the voltage on the rotating electrical machine unit side of both ends of the resistor. Can be properly determined.

  In the ninth means, a first resistor (41) and a second resistor (42) are connected in series as the resistor to the bypass path. Then, the acquisition unit acquires, as the detection voltage, voltages at both ends of the first resistor and the second resistor when the smoothing capacitor is charged by energization through the bypass path. To do. In addition, the failure determination unit may determine a voltage difference between both ends of the first resistor and a voltage difference between both ends of the second resistor based on voltages at both ends of the first resistor and the second resistor. Is calculated, and it is determined that the resistor is short-circuited based on the voltage difference across the first resistor and the voltage difference across the second resistor.

  When the first resistor or the second resistor connected in parallel to the main switch is short-circuited, the resistance ratio between the first resistor and the second resistor changes, so that the energization through the bypass path When the smoothing capacitor is charged, the magnitude relationship between the voltage difference between both ends of the first resistor and the voltage difference between both ends of the second resistor is different from that in the normal state. Therefore, when the smoothing capacitor is charged by energization through the bypass path, the resistor is short-circuited based on the voltage difference between both ends of the first resistor and the voltage difference between both ends of the second resistor. Can be determined appropriately.

  In a tenth means, the power supply system includes a branch resistor (83, 84) and a failure detection switch (85) between the rotating electrical machine unit side and the ground of both ends of the resistor in the bypass path. Are connected in series. The acquisition unit acquires, as the detection voltage, each voltage across the resistor in the bypass path when the failure detection switch is on. In addition, the failure determination unit, when the failure detection switch is on, the resistor is short-circuited based on the fact that the voltage difference across the resistor in the bypass path is greater than 0 and less than or equal to a predetermined value. Determine that there is a failure.

  In the above configuration, when the failure detection switch is turned on, the bypass path resistor and the branch resistor are connected in series. In this state, if the bypass path resistor is short-circuited, The resistance ratio between the path resistor and the branch resistor changes. Therefore, when a current flows from the storage battery via the resistor and the branch resistor in the bypass path, the voltage difference between both ends of the resistor in the bypass path is different from that in the normal state. Therefore, when the failure detection switch is on, it is possible to appropriately determine that the resistor is short-circuited based on the voltage difference between both ends of the resistor in the bypass path.

  In the eleventh means, the power supply system includes the storage battery as the first storage battery (11) and the main switch as the first switch (SW1), while the connection path is closer to the rotating electrical machine unit than the first switch. And a second storage battery (12) connected in parallel to the first storage battery, and a second switch (SW2) connected to the positive electrode side of the second storage battery. Then, the acquisition unit acquires the detection voltage in a state where the second switch is off.

  In the power supply system in which the first storage battery and the second storage battery are connected in parallel to the rotating electrical machine unit, power can be supplied from each of the storage batteries to the rotating electrical machine unit. In this case, the detection voltage is acquired on the condition that the second switch is turned off, that is, the power supply from the second storage battery to the rotating electrical machine unit is stopped. A failure can be properly determined.

The electric circuit diagram which shows the power supply system of 1st Embodiment. The block diagram of a failure detection circuit. A time chart for explaining a short circuit failure. A time chart for explaining an open failure. The flowchart which shows the process sequence of failure determination. FIG. 6 is a flowchart illustrating a failure determination processing procedure subsequent to FIG. 5. The block diagram of the failure detection circuit in 2nd Embodiment. The flowchart which shows the process sequence of the failure determination in 2nd Embodiment. The flowchart which shows the process sequence of the failure determination in 2nd Embodiment. The block diagram of the failure detection circuit in 3rd Embodiment. The flowchart which shows the process sequence of the failure determination in 3rd Embodiment. The electric circuit diagram which shows the power supply system in another example. The electric circuit diagram which shows the power supply system in another example. The electric circuit diagram which shows the power supply system in another example.

  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, and P3, of which the lead storage battery 11, the starter 13, and the electric load 14 are connected to the output terminal P1, and the rotating electrical machine unit 20 is connected to the output terminal P2. The electric 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.

  The rotating electrical machine unit 20 operates the rotating electrical machine 21 by a rotating electrical machine 21 that is a field current type three-phase AC motor, an inverter 22 connected to each phase winding of the rotating electrical machine 21, and energization control of the inverter 22. A rotating electrical machine control unit 23 for controlling, 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 drivably connected to an output shaft (crankshaft) of an engine (not shown) by a connecting member including a belt and a pulley, and rotation is transmitted between the rotating electrical machine 21 and the engine. A switch 25 made of, for example, a semiconductor switch element is connected in series to the field coil 24 of the rotating electrical machine 21.

  In the rotating electrical machine unit 20, a smoothing capacitor 26 is connected to a power path that is connected to the output terminal P <b> 2 of the battery unit 30. The smoothing capacitor 26 smoothes noise input via, for example, a power path.

  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 supplies the direct current to the storage batteries 11, 12, and the like. Thereby, charge of each storage battery 11 and 12 is implemented. 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 control unit 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine control unit 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 control unit 23 controls the field current flowing in the field coil 24 by controlling the on / off of the switch 25.

  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. The first switch SW1 corresponds to the main switch. 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. The units 20 are mutually energized.

  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.

  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.

  In addition, the battery unit 30 includes a bypass path L3 connecting the output terminal P1 and the output terminal P2, that is, both ends of the first switch SW1, and between the output terminal P1 and the output terminal P3, that is, both ends of the third switch SW3. And a bypass path L4 connecting the two. Resistors 41 and 42 are connected in series to the bypass path L3. That is, the resistors 41 and 42 are provided in parallel with the first switch SW1. The lead storage battery 11 and the rotating electrical machine unit 20 are always connected via the resistors 41 and 42 of the bypass path L3. In this case, the resistance values (the combined resistance values) of the resistors 41 and 42 are several tens of ohms to several hundreds of ohms, and are 200 ohms in the present embodiment, for example. Since the lead storage battery 11 and the rotating electrical machine unit 20 are always connected via the resistors 41 and 42, current can be constantly supplied from the lead storage battery 11 to the rotating electrical machine unit 20 while being limited in current. The smoothing capacitor 26 in the rotating electrical machine unit 20 is held in a charged state. Each of the resistors 41 and 42 may be constituted by a series resistor portion of a plurality of resistors.

  Further, a bypass relay 45 and a fuse 46 are provided in the bypass path L4. That is, the bypass relay 45 is provided in parallel with the third switch SW3. The bypass relay 45 is a normally closed mechanical relay switch. By closing the bypass relay 45, the lead storage battery 11 and the electrical load 15 are electrically connected even if the third switch SW3 is off. For example, when the IG switch (ignition switch) that is a power switch of the vehicle is turned off, the switches SW1 to SW4 are turned off (closed), and in this state, the electric load 15 is connected via the bypass relay 45. On the other hand, dark current is supplied.

  The battery unit 30 includes a battery control unit 50 that controls on / off (opening / closing) of the switches SW1 to SW4 and the bypass relay 45. The battery control unit 50 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The battery control unit 50 turns on / off 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 60 such as an engine ECU in the system operating state where the IG switch is turned on. Control. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery control unit 50 calculates the SOC (state of charge) of the lithium ion storage battery 12 and charges and discharges the lithium ion storage battery 12 so that the SOC is maintained within a predetermined use range. Control the amount.

  In this system, a communication network such as CAN is constructed, and the communication network enables mutual communication between various ECUs. The rotating electrical machine control unit 23, the battery control unit 50, the ECU 60, and the like are connected to the communication network. The ECU 60 is a host control device that manages the rotating electrical machine control unit 23 and the battery control unit 50 in an integrated manner, and is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The ECU 60 controls the operation of the engine based on, for example, each engine operation state and vehicle travel state.

  As described above, the battery unit 30 has the resistors 41 and 42 connected in series to the bypass path L3 that connects both ends of the first switch SW1, and rotates from the lead storage battery 11 through the resistors 41 and 42. The smoothing capacitor 26 of the electric unit 20 can be charged. However, if a short circuit failure or an open failure occurs in the resistors 41 and 42, there is a concern that a problem associated with the failure occurs. For example, when a short circuit failure occurs, the path resistance in the bypass path L3 is unintentionally reduced, and there is a concern that an excessive current flows from the lead storage battery 11 to the rotating electrical machine unit 20. Moreover, when an open failure occurs, there is a concern that the smoothing capacitor 26 of the rotating electrical machine unit 20 may be charged. In addition, since the field coil 24 is connected in parallel to the smoothing capacitor 26, current cannot be properly supplied to the field coil 24 when the smoothing capacitor 26 is not charged. It is possible that the operation of power generation and power running will be hindered.

  Therefore, the battery unit 30 is provided with a failure detection circuit 70 that detects the failure of the resistors 41 and 42. FIG. 2 is a configuration diagram of the failure detection circuit 70. In FIG. 2, the lead storage battery 11 is connected to one end of the first switch SW1 as described above, and the smoothing capacitor 26 of the rotating electrical machine unit 20 is connected to the other end.

  In the failure detection circuit 70, a resistor 43 and a failure detection switch 44 are connected in series between the intermediate point of the resistors 41 and 42 and the ground. In this case, the failure detection switch 44 is provided on the intermediate point side, and the resistor 43 is provided on the ground side. In the present embodiment, the resistor 41 corresponds to the first resistor, the resistor 42 corresponds to the second resistor, and the resistor 43 corresponds to the third resistor.

  The failure detection switch 44 is, for example, a normally open semiconductor switch. Further, voltage detectors 71 and 72 are connected to both ends of the series resistor composed of the resistors 41 and 42, that is, the first point N11 and the second point N12, respectively, and between the failure detection switch 44 and the resistor 43. A voltage detector 73 is connected to the intermediate point, that is, the third point N13. The voltage detector 71 detects the voltage V1, the voltage detector 72 detects the voltage V2, and the voltage detector 73 detects the voltage V3. The voltage detectors 71 to 73 are configured as, for example, a voltage dividing detection circuit having a series resistor. For example, the resistance values of the resistors 41 and 42 are 100Ω, and the resistance value of the resistor 43 is 50Ω. In the present embodiment, the resistance values of the resistors 41 and 42 are the same, but may be different from each other.

  The voltages V1 to V3 detected by the voltage detectors 71 to 73 are input to the battery controller 50, respectively. The battery control unit 50 performs failure determination using the resistors 41 to 43 and the failure detection switch 44 as determination targets based on the voltages V1 to V3 acquired from the voltage detection units 71 to 73. Hereinafter, determination of short failure and determination of open failure for the resistors 41 to 43 and the failure detection switch 44 will be described. In the present embodiment, the battery control unit 50 corresponds to an acquisition unit and a failure determination unit.

(1) Determination of short-circuit failure When determining a short-circuit failure, the battery control unit 50 turns on (closes) the first switch SW1, and in that state, the voltages V1 to V3 when the failure detection switch 44 is off, Based on the voltages V1 to V3 when the failure detection switch 44 is on,
・ Whether or not a short circuit failure has occurred in any of the resistors 41 and 42,
・ Whether or not a short circuit failure has occurred in the resistor 43,
Whether or not a short circuit failure (on failure) has occurred in the failure detection switch 44;
Respectively.

  FIG. 3A shows the voltages V1 to V3 at the normal time. Under normal conditions, the failure detection switch 44 is off, the voltages V1 and V2 are both the same voltage value (for example, 12V) as the lead storage battery 11, and the voltage V3 is 0V. As the failure detection switch 44 is turned on, the voltage V3 increases to an intermediate value (for example, 6V).

  At the time of a short circuit failure in either one of the resistors 41 and 42, as shown in FIG. 3B, the failure detection switch 44 is off and the voltages V1 and V2 are both the same voltage value as the lead storage battery 11, The voltage V3 is 0V. As the failure detection switch 44 is turned on, the voltage V3 increases to the same voltage value as the voltages V1 and V2. In this case, a short-circuit failure in one of the resistors 41 and 42 is determined based on the voltages V1 and V3 having the same voltage value (V1≈V3) with the failure detection switch 44 turned on. be able to.

  At the time of a short circuit failure in the resistor 43, as shown in FIG. 3C, the failure detection switch 44 is off, the voltages V1 and V2 are both the same voltage value as the lead storage battery 11, and the voltage V3 is 0V. is there. Even if the failure detection switch 44 is turned on, the voltage V3 is maintained at 0V. In this case, a short circuit failure in the resistor 43 can be determined based on the voltage V3 being 0 V (V3≈0 V) in a state where the failure detection switch 44 is turned on.

  When a short circuit failure occurs in the failure detection switch 44, as shown in FIG. 3D, the failure detection switch 44 is in an on state regardless of an on / off command. In this case, during the off command period, the voltages V1 and V2 are both the same voltage value as that of the lead storage battery 11, and the voltage V3 is an intermediate value (for example, 6V). Further, the same state is maintained even during the period when the failure detection switch 44 is on. In this case, it is possible to determine a short-circuit failure (on-failure) in the failure detection switch 44 based on the voltage V3 being a predetermined intermediate value during the OFF command period of the failure detection switch 44.

(2) Determination of Open Failure When determining an open failure, the battery control unit 50 turns off (opens) the first switch SW1, and in that state, the voltages V1 to V3 when the failure detection switch 44 is off, Based on the voltages V1 to V3 when the failure detection switch 44 is on,
・ Whether an open failure has occurred in any of the resistors 41 and 42,
-Whether an open failure has occurred in the resistor 43,
Whether an open failure (off failure) has occurred in the failure detection switch 44,
Respectively.

  FIG. 4A shows the voltages V1 to V3 at the normal time. At normal time, as in FIG. 3A, the failure detection switch 44 is off, the voltages V1, V2 are both the same voltage value (for example, 12V) as the lead storage battery 11, and the voltage V3 is 0V. As the failure detection switch 44 is turned on, the voltage V3 increases to an intermediate value (for example, 6V).

  At the time of an open failure in any of the resistors 41 and 42, as shown in FIG. 4B, the failure detection switch 44 is off and the voltage V1 is the same voltage value as the lead storage battery 11, and the voltage V2, Both V3 are 0V. If the resistor 41 of the resistors 41 and 42 has an open failure, the voltages V2 and V3 are both maintained at 0V when the failure detection switch 44 is turned on. If the resistor 42 has an open failure, when the failure detection switch 44 is turned on, the voltage V2 is maintained at 0V and the voltage V3 rises to an intermediate value (for example, 4V). In this case, it is possible to determine an open failure in one of the resistors 41 and 42 based on the voltage V2 being 0V (V2≈0V) in a state where the failure detection switch 44 is turned on or off. it can.

  When an open failure occurs in the resistor 43, as shown in FIG. 4C, the failure detection switch 44 is off, the voltages V1 and V2 are both the same voltage value as the lead storage battery 11, and the voltage V3 is 0V. is there. As the failure detection switch 44 is turned on, the voltage V3 increases to the same voltage value as the voltages V1 and V2. In this case, an open failure in the resistor 43 can be determined based on the voltages V1 and V3 having the same voltage value (V1≈V3) with the failure detection switch 44 turned on.

  When an open failure occurs in the failure detection switch 44, as shown in FIG. 4D, the failure detection switch 44 is in an OFF state regardless of an ON / OFF command. In this case, in the period of the off command, the voltages V1 and V2 are both the same voltage value as the lead storage battery 11, and the voltage V3 is 0V. Further, the same state is maintained even during the period when the failure detection switch 44 is on. In this case, an open failure (off failure) at the failure detection switch 44 can be determined based on the voltage V3 being 0 V (V3≈0 V) during the ON command period of the failure detection switch 44.

  FIG. 5 and FIG. 6 are flowcharts showing a processing procedure for failure determination by the battery control unit 50, and this processing is performed, for example, after the IG switch is turned off. In this failure determination process, the short failure determination and the open failure determination are respectively performed in a period before and after in time series.

  In FIG. 5, in step S <b> 11, it is determined whether or not to perform short failure determination in the failure detection circuit 70. And if step S11 is affirmed, it will progress to step S12. In step S12, the first switch SW1 is turned on and the second switch SW2 is turned off. In step S13, the failure detection switch 44 is turned off (that is, a switch-off command is output), and in subsequent step S14, it is determined whether or not there is a short failure (on failure) in the failure detection switch 44. In this case, if the voltage V3 is a predetermined intermediate value even though the failure detection switch 44 is turned off, it is determined that a short failure has occurred in the failure detection switch 44.

  Thereafter, in step S15, it is determined whether or not the failure determination in step S14 has been completed. If completed, the process proceeds to subsequent step S16.

  In step S16, the failure detection switch 44 is turned on (that is, a switch-on command is output), and in subsequent step S17, it is determined whether or not there is a short failure in the resistors 41 to 43. In this case, if the failure detection switch 44 is on and the voltages V1 and V3 are the same voltage value (V1≈V3), it is determined that one of the resistors 41 and 42 has a short failure. If the failure detection switch 44 is on and the voltage V3 is 0 V, it is determined that a short circuit failure has occurred in the resistor 43.

  Thereafter, in step S18, it is determined whether or not the failure determination in step S17 is completed. If completed, the process returns to step S11. After the short failure determination is completed, step S11 is denied and the process proceeds to step S21 in FIG.

  In FIG. 6, in step S <b> 21, it is determined whether or not to perform open failure determination in the failure detection circuit 70. And if step S21 is affirmed, it will progress to step S22. If step S21 is negative, this process ends. In step S22, the first switch SW1 is turned off and the second switch SW2 is turned off. In step S23, the failure detection switch 44 is turned off (that is, a switch-off command is output), and in subsequent step S24, it is determined whether or not there is an open failure in any of the resistors 41 and 42. In this case, if the failure detection switch 44 is in an OFF state and the voltage V2 is 0 V, it is determined that an open failure has occurred in either of the resistors 41 and 42. However, the presence or absence of an open failure in any of the resistors 41 and 42 may be determined with the failure detection switch 44 turned on.

  Thereafter, in step S25, it is determined whether or not the failure determination in step S24 has been completed. If completed, the process proceeds to subsequent step S26.

  In step S26, the failure detection switch 44 is turned on (that is, a switch-on command is output), and in the subsequent step S27, there is an open failure in the resistor 43, and an open failure in the failure detection switch 44 (off failure). The presence or absence of is determined. In this case, if the failure detection switch 44 is on and the voltages V1 and V3 are the same voltage value (V1≈V3), it is determined that an open failure has occurred in the resistor 43. In addition, if the voltage V3 is 0 V even though the failure detection switch 44 is on, the failure detection switch 44 determines that an open failure has occurred.

  Thereafter, in step S28, it is determined whether or not the failure determination in step S27 has been completed. If it has been completed, this processing is terminated.

  When it is determined that a failure has occurred, failure occurrence information indicating that fact is stored in the memory, and a predetermined fail-safe process may be performed. For example, when a short circuit failure occurs in either one of the resistors 41 and 42, the operation of power generation and power running of the rotating electrical machine unit 20 may be limited so that excessive current does not flow through the bypass path L3. In addition, when an open failure occurs in either of the resistors 41 and 42, the smoothing capacitor 26 cannot be charged via the bypass path L3. Therefore, power generation and power running of the rotating electrical machine unit 20 may be prohibited. .

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

  In the power supply system having the above configuration, a bypass path L3 that bypasses the first switch SW1 is provided in parallel to the connection path between the rotating electrical machine unit 20 and the lead storage battery 11, and the resistors 41 and 42 are provided in the bypass path L3. It has been. Therefore, even when the first switch SW1 is turned off (opened), power can be supplied from the lead storage battery 11 to the rotating electrical machine unit 20 via the bypass path L3. In this case, in particular, since the resistors 41 and 42 are provided in the bypass path L3, the smoothing capacitor 26 provided in the rotating electrical machine unit 20 is always charged while limiting the current flowing through the bypass path L3. It becomes possible to hold. Therefore, when the rotating electrical machine unit 20 is activated and operated as a generator or an electric motor, the operation can be quickly and appropriately started. Further, since a normally closed relay is not essential in the bypass route L3, the configuration can be simplified. As a result, the rotating electrical machine unit 20 can be appropriately operated while simplifying the configuration.

  Since a plurality of resistors 41, 42 are connected in series to the bypass path L3, even if a short circuit failure occurs in either of the resistors 41, 42, the current flowing through the bypass path L3 is limited by the remaining resistors. Therefore, it is possible to regulate an excessive current flowing through the bypass path L3.

  If a short failure or an open failure occurs in the resistors 41 and 42, the smoothing capacitor 26 cannot be charged properly. In this respect, since it is configured to determine whether there is a short failure or an open failure of the resistors 41 and 42 based on the voltages V1 to V3 (detection voltages) of the failure detection circuit 70, it is possible to properly grasp these failures. Therefore, it is possible to take appropriate measures when a failure occurs.

  When the first switch SW1 is on and the failure detection switch 44 is on, one of the resistors 41 and 42 is short-circuited based on the fact that the voltage V3 is substantially the same as the voltage V1. Can be determined appropriately.

  When the first switch SW1 is off and the failure detection switch 44 is on or off, it is determined that one of the resistors 41 and 42 has an open failure based on the voltage V2 being substantially zero. It can be determined appropriately.

  When the first switch SW1 is on and the failure detection switch 44 is on, it is possible to appropriately determine that the resistor 43 is short-circuited based on the voltage V3 being substantially zero. .

  When the first switch SW1 is off and the failure detection switch 44 is on, it is properly determined that the resistor 43 has an open failure based on the fact that the voltage V3 is substantially the same as the voltage V1. be able to.

  When the first switch SW1 is on and the failure detection switch 44 is instructed to turn off, the failure detection switch 44 has a short failure (on failure) based on the fact that the voltage V3 is an intermediate voltage. It can be determined appropriately.

  When the first switch SW1 is OFF and the failure detection switch 44 is instructed to be ON, it is determined that the failure detection switch has an open failure (OFF failure) based on the voltage V3 being substantially zero. Can be determined.

  In the power supply system in which the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 20, power can be supplied from the storage batteries 11, 12 to the rotating electrical machine unit 20. In this case, the detection voltage (V1 to V3) is acquired on condition that the second switch SW2 is turned off, that is, the power supply from the lithium ion storage battery 12 to the rotating electrical machine unit 20 is stopped. It is possible to appropriately determine a short circuit failure or an open failure of the resistors 41 and 42.

  Hereinafter, embodiments other than the first embodiment will be described. In addition, about each following embodiment, it demonstrates centering around difference with the said 1st Embodiment.

(Second Embodiment)
FIG. 7 shows a failure detection circuit 70 in the second embodiment. In FIG. 7, as a difference from FIG. 2, the resistor 43 and the failure detection switch 44 that are connected to the intermediate point between the resistors 41 and 42 are deleted. In FIG. 7, voltage detectors 71 and 72 are connected to both ends of a series resistor composed of resistors 41 and 42, respectively, and a voltage detector 73 is connected to an intermediate point between the resistors 41 and 42. These voltage detectors 71 to 73 detect voltages V1 to V3.

  In the present embodiment, the battery control unit 50 performs the failure determination in the failure detection circuit 70 based on the voltages V1 to V3 detected by the voltage detection units 71 to 73 in the off state of the switches SW1 and SW2. To do. In this case, the battery control unit 50 determines that an open failure has occurred in either of the resistors 41 and 42 based on that any one of the voltages V1 to V3 is 0V (about 0V).

  In addition, the battery control unit 50 selects one of the resistors 41 and 42 based on the time required for charging the smoothing capacitor 26 when the smoothing capacitor 26 is charged with the first switch SW1 turned off. It is determined whether or not a short fault has occurred. That is, if a short circuit failure occurs in either one of the resistors 41 and 42, the required time for charging the smoothing capacitor 26 is shorter than that in the normal state. Therefore, the resistors 41 and 42 are short-circuited based on the required time for charging. Perform failure determination. In this case, the battery control unit 50 measures the required time for charging the smoothing capacitor based on the voltage (voltage V2) on the rotating electrical machine unit 20 side of both ends of the resistors 41 and 42, and based on the required time. Thus, it is determined that the resistors 41 and 42 are short-circuited.

  More specifically, when the lead storage battery 11 is connected to the power supply terminal in an operation stop state of the power supply system (the first switch SW1 or the like is off), that is, when the power supply line is connected to the lead storage battery 11 It is determined that the capacitor 26 is being charged, and short-circuit failure determination of the resistors 41 and 42 is performed based on the required charging time at that time. In this case, since the battery control unit 50 needs to be in an operating state when the lead storage battery 11 is connected, the battery control unit 50 may be operated in, for example, the low power mode while the IG is off. Note that the short-circuit failure determination may be performed by a control device other than the battery control unit 50.

  Or in the structure provided with the discharge circuit 75 (refer FIG. 7) in the connection path | route between the lead storage battery 11 and the rotary electric machine unit 20, the battery control part 50 makes the smoothing capacitor 26 intentionally discharge beforehand, and the discharge At the time of recharging at a later time, the short failure determination of the resistors 41 and 42 is performed based on the required charging time of the smoothing capacitor 26.

  FIG. 8 is a flowchart showing a processing procedure of short failure determination by the battery control unit 50, and this processing is repeatedly performed at a predetermined cycle, for example.

  In FIG. 8, in step S31, it is determined whether or not the smoothing capacitor 26 is being charged. At this time, the battery control unit 50, for example, based on the fact that the voltage of the power supply line connected to the positive terminal of the lead storage battery 11 changes from 0 V to a predetermined positive voltage, the smoothing capacitor 26 accompanying the connection of the lead storage battery 11 is used. It is determined that the battery is charging. Alternatively, the battery control unit 50 determines that recharging is performed after the smoothing capacitor 26 is discharged.

  If it is determined that the smoothing capacitor 26 is being charged, the process proceeds to step S32 to start incrementing the counter. In a succeeding step S33, it is determined whether or not the charging of the smoothing capacitor 26 is completed. At this time, for example, the completion of charging may be determined based on the fact that the voltage V2 detected by the voltage detection unit 72 has reached a predetermined charging completion determination value. If charging is not completed, the process returns to step S32. If charging is completed, the process proceeds to step S34.

  In step S34, it is determined whether or not the counter value is less than a predetermined threshold value TH1. If the counter value is less than the threshold value TH1, the process proceeds to step S35, and it is determined that a short circuit failure has occurred in one of the resistors 41 and 42. If the counter value is greater than or equal to the threshold value TH1, this process is terminated as it is.

  Further, when the smoothing capacitor 26 is charged with the first switch SW1 turned off, the voltage difference across the resistor 41, that is, the voltage difference ΔVa between the voltages V1 and V3, and the voltage difference across the resistor 42, That is, the voltage difference ΔVb between the voltages V2 and V3 may be calculated, and based on them, it may be determined that one of the resistors 41 and 42 has a short circuit failure. In the present embodiment, the resistors 41 and 42 have the same resistance value.

  FIG. 9 is a flowchart showing a processing procedure for short-circuit failure determination by the battery control unit 50, and this processing is performed in place of the processing in FIG.

  In FIG. 9, in step S41, it is determined whether or not the smoothing capacitor 26 is being charged. This process is the same as step S31 in FIG. If it is determined that the smoothing capacitor 26 is being charged, the process proceeds to step S42, and a voltage difference ΔVa between the voltages V1 and V3 and a voltage difference ΔVb between the voltages V2 and V3 are calculated. In the subsequent step S43, it is determined whether or not the absolute value of the difference between the voltage differences ΔVa and ΔVb is larger than a predetermined threshold value TH2. If | ΔVa−ΔVb |> TH2, the process proceeds to step S44, and it is determined that one of the resistors 41, 42 has a short circuit failure. That is, if a short circuit failure occurs in either one of the resistors 41 and 42, the voltage difference between both ends of each resistor 41 and 42 will be different. Perform failure determination.

  In step S44, the voltage differences ΔVa and ΔVb may be compared, and it may be determined that a short circuit has occurred in the resistor corresponding to the smaller one. That is, if ΔVa <ΔVb, it is determined that a short circuit failure has occurred in the resistor 41, and if ΔVa> ΔVb, it is determined that a short circuit failure has occurred in the resistor 42.

  According to this embodiment, the following excellent effects can be obtained.

  If either one of the resistors 41 and 42 is short-circuited, when the smoothing capacitor 26 is charged by energization through the bypass path L3, the time required for the charging is shorter than normal. Therefore, when the smoothing capacitor 26 is charged by energization through the bypass path L3, one of the resistors 41 and 42 is short-circuited based on the required charging time measured based on the voltage V2. Can be determined appropriately.

  In addition, when one of the resistors 41 and 42 is short-circuited, the resistance ratio of each resistor 41 and 42 is changed. Therefore, when the smoothing capacitor 26 is charged by energization through the bypass path L3, The magnitude relationship between the voltage differences ΔVa and ΔVb is different from that in the normal state. Therefore, when the smoothing capacitor 26 is charged by energization through the bypass path L3, it is appropriately determined that one of the resistors 41 and 42 is short-circuited based on the voltage difference ΔVa and ΔVb. be able to.

(Third embodiment)
FIG. 10 shows a failure detection circuit 80 in the third embodiment. In the failure detection circuit 80, voltage detectors 81 and 82 are connected to both ends of a series resistor composed of resistors 41 and 42, respectively. The voltage detector 81 detects the voltage V11, and the voltage detector 82 detects the voltage V12. The voltage detectors 81 and 82 are configured as a voltage dividing detection circuit having a series resistor, for example. In addition, resistors 83 and 84 and a failure detection switch 85 are connected in series between the smoothing capacitor 26 side and the ground at both ends of the series resistors of the resistors 41 and 42. The resistors 83 and 84 correspond to branch resistors. The failure detection switch 85 is, for example, a normally open semiconductor switch.

  The battery control unit 50 performs the failure determination of each unit described below with the switches SW1 and SW2 being turned off.

  (1) Based on the fact that one of the voltages V11 and V12 detected by the voltage detectors 81 and 82 is 0V (about 0V), an open failure has occurred in either of the resistors 41 and 42. Determine.

  (2) When the failure detection switch 85 is on, the voltage difference between the resistors 41 and 42 (the difference between the voltages V11 and V12) is greater than 0 and less than or equal to a predetermined value. It is determined that a short circuit failure has occurred. The predetermined value is determined by the resistance ratio (1: 1 in the present embodiment) of the resistors 41 and 42 and the resistors 83 and 84 in a normal state, and is, for example, 5V. That is, the on state of the failure detection switch 85 is a state in which a current flows through each of the resistors 41, 42, 83, 84, and if a short failure occurs in the resistors 41, 42 under such a state, The resistance ratio of the resistors 41 and 42 and the resistors 83 and 84 changes, and the voltage V12 becomes larger than that in the normal state. Therefore, a short circuit failure in the resistors 41 and 42 can be determined based on the voltage difference between the resistors 41 and 42.

  (3) An open failure has occurred in one of the resistors 83 and 84 based on the fact that the voltage V12 does not change from when the failure detection switch 85 is turned on, that is, for example, remains at 12V. Judgment is made.

  (4) In the ON state of the failure detection switch 85, it is determined that a short failure has occurred in either of the resistors 83 and 84 based on the voltage difference between the resistors 41 and 42 being greater than or equal to a predetermined value. To do. The predetermined value is determined by the resistance ratio (1: 1 in the present embodiment) of the resistors 41 and 42 and the resistors 83 and 84 in a normal state, and is, for example, 7V. If a short circuit failure occurs in the resistors 83 and 84 when the failure detection switch 85 is on, that is, a current flows through the resistors 41, 42, 83, and 84, the resistors 41 and 42 and the resistors The resistance ratio of the bodies 83 and 84 changes, and the voltage V12 becomes smaller than normal. Therefore, a short circuit failure in the resistors 41 and 42 can be determined based on the voltage difference between the resistors 41 and 42.

  (5) Based on the fact that the voltage V12 does not change from that before the ON command, that is, for example, it remains 12V despite the ON command of the failure detection switch 85 being received, an open failure (OFF) is detected by the failure detection switch 85. It is determined that a failure has occurred.

  (6) On the basis of the fact that there is a difference between the voltages V11 and V12 despite that the failure detection switch 85 has been turned off, that is, the current is flowing through each resistor, the failure detection switch 85 It is determined that a short circuit failure (ON failure) has occurred.

  FIG. 11 is a flowchart illustrating a failure determination process performed by the battery control unit 50. This process is performed, for example, after the IG switch is turned off, that is, in a state where the first switch SW1 is turned off.

  In FIG. 11, in step S51, the failure detection switch 85 is turned off (that is, a switch-off command is output), and in the subsequent step S52, it is determined whether or not there is an open failure in any of the resistors 41 and. In this case, if the failure detection switch 85 is in the OFF state and the voltage V12 is 0 V (about 0 V), it is determined that an open failure has occurred in one of the resistors 41 and 42.

  In step S53, it is determined whether or not there is a short failure (on failure) in the failure detection switch 85. In this case, if there is a difference between the voltages V11 and V12 even though the failure detection switch 85 is off, the failure detection switch 85 determines that a short failure has occurred.

  Thereafter, in step S54, the failure detection switch 85 is turned on (that is, a switch-on command is output), and in the subsequent step S55, it is determined whether or not there is a short failure in any of the resistors 41 and 42. In this case, if the failure detection switch 85 is on and the voltage difference between the resistors 41 and 42 (the difference between the voltages V11 and V12) is greater than 0 and less than or equal to a predetermined value, either of the resistors 41 and 42 Determine that a short circuit has occurred.

  In step S56, it is determined whether or not there is an open failure in any of the resistors 83 and 84. In this case, when the failure detection switch 85 is in the ON state and the voltage V12 does not change from before switching on, it is determined that an open failure has occurred in either of the resistors 83 and 84. In step S57, it is determined whether or not there is a short circuit failure in any of the resistors 83 and 84. In this case, if the failure detection switch 85 is in the ON state and the voltage difference between the resistors 41 and 42 is greater than or equal to a predetermined value, it is determined that one of the resistors 83 and 84 has a short failure.

  In step S58, it is determined whether or not there is an open failure (off failure) in the failure detection switch 85. In this case, if the voltage V12 does not change from that before the on command even though the on command of the failure detection switch 85 is received, it is determined that an open failure has occurred in the failure detection switch 85. In the above configuration, however, the failure detection switch 85 is turned on / off in any of the cases where an open failure occurs in either of the resistors 83 and 84 and an open failure (off failure) occurs in the failure detection switch 85. Regardless, the voltage V12 is held at the same voltage (12V). Therefore, if the voltage V12 is held at the same voltage (12V) regardless of whether the failure detection switch 85 is on or off, an open failure in one of the resistors 83 and 84 or an open failure in the failure detection switch 85 ( It may be determined that any of the off-state faults has occurred.

  According to the present embodiment, as described above, an open failure and a short failure in any of the resistors 41 and 42 can be properly determined. In addition to this, it is possible to determine an open failure and a short failure in one of the resistors 83 and 84 and an open failure (off failure) and a short failure (on failure) in the failure detection switch 85. .

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

  -The power supply system shown in FIG. 12 may be sufficient. In FIG. 12, a diode 91 is connected in series to the resistors 41 and 42 in the bypass path L3 with the lead storage battery 11 side as an anode and the rotating electrical machine unit 20 side as a cathode. Note that the configuration in which the diode 91 is provided in series with the resistors 41 and 42 in the bypass path L3 can be applied to other configurations including the configuration of FIG.

  According to the above configuration, the direction of current in the bypass path L3 is limited. In this case, the current flow is allowed only in the direction from the lead storage battery 11 to the smoothing capacitor 26, and inconvenience due to the backflow of the current can be suppressed. For example, even if reverse connection is performed in the lead storage battery 11 in which the positive electrode and the negative electrode are reversed, the reverse connection current is suppressed from flowing therewith.

  -The power supply system shown in FIG. 13 may be sufficient. In FIG. 13, the resistors 41 and 42 are provided as parallel resistor portions each formed by connecting a plurality of resistors in parallel. In this case, the smoothing capacitor 26 can be charged via the bypass path L3 even if an open failure occurs in any of the resistors in the parallel resistance portion.

  -The power supply system shown in FIG. 14 may be sufficient. In FIG. 14, the bypass path L3 is provided as a path for connecting the IG terminal P4 and the output terminal P2 in the battery unit 30. The lead storage battery 11 is connected to the IG terminal P4 via the IG switch 92. In this case, when the IG switch 92 is turned on to power on the vehicle, the lead storage battery 11 and the smoothing capacitor 26 of the rotating electrical machine unit 20 are connected. Thereby, electric power is supplied to the smoothing capacitor 26 from the lead storage battery 11 via the bypass path L3, and the smoothing capacitor 26 is charged.

  In the configuration of FIG. 14, since the smoothing capacitor 26 is charged after the IG switch 92 is turned on, the time required for charging is shortened compared to the configuration in which the bypass path L3 is always connected to the lead storage battery 11. Is desirable. Therefore, the resistance values of the resistors 41 and 42 are set to about 30Ω.

  In the failure determination processing in each of the above-described embodiments, a configuration in which only the short failure determination or only the open failure determination is performed among the short failure determination and the open failure determination in the failure detection circuits 70 and 80 is adopted. It is also possible.

  In the above embodiment, a plurality of resistors are provided in series in the bypass path L3, but this may be changed to provide a single resistor.

  In the above embodiment, the rotating electric machine unit is configured to use the rotating electric machine unit 20 having the power generation function and the power running function. However, the configuration is changed to use a generator unit having only the power generation function, or only the power running function. The structure using the electric motor unit which has may be sufficient.

  In the battery unit 30, the battery control unit 50 may be configured outside the unit. Further, the present invention is not limited to the one realized by including the battery unit 30. That is, you may implement | achieve other than the structure which packed the lithium ion storage battery 12 and each switch integrally.

  -A power supply system is not restricted to a thing provided with the lead storage battery 11 and the lithium ion storage battery 12 as a 1st storage battery and a 2nd storage battery. For example, instead of either the lead storage battery 11 or the lithium ion storage battery 12, another secondary battery such as a nickel metal hydride storage battery may be used. Also, both the first storage battery and the second storage battery can be lead storage batteries or lithium ion storage batteries. In the power supply system, a configuration using one storage battery or a configuration using three or more storage batteries may be used.

  -It is not limited to a vehicle-mounted power supply device, It is also possible to apply this invention to power supply devices other than vehicle-mounted.

  DESCRIPTION OF SYMBOLS 10 ... Lead storage battery, 20 ... Rotating electrical machine unit, 26 ... Smoothing capacitor, 41, 42 ... Resistor, 50 ... Battery control part, SW1 ... 1st switch (main switch).

Claims (11)

A rotating electrical machine unit (20) having at least one of power generation and power running functions;
A storage battery (11) connected to the rotating electrical machine unit via a connection path;
A main switch (SW1) provided in the connection path;
A power supply system in which the storage switch and the rotating electrical machine unit are brought into conduction when the main switch is turned on in a system operating state,
The rotating electrical machine unit has a smoothing capacitor (26) connected to the connection path,
A power supply system in which a bypass path (L3) is connected in parallel to the connection path so as to bypass the main switch, and a resistor (41, 42) is provided in the bypass path.   The power supply system according to claim 1, wherein a plurality of the resistors are connected in series to the bypass path.   3. The power supply according to claim 1, wherein a diode (91) is connected in series to the resistor in a direction in which the storage battery side is an anode and the rotating electrical machine unit side is a cathode. system. An acquisition unit (50) for acquiring a voltage applied to the resistor as a detection voltage;
A failure determination section (50) for determining at least one of the presence or absence of a short circuit failure and the presence or absence of an open failure based on the detected voltage;
The power supply system according to any one of claims 1 to 3. In the bypass path, a first resistor (41) and a second resistor (42) are connected in series as the resistor,
Between the intermediate point between the first resistor and the second resistor and the ground, the failure detection switch (44) is on the intermediate point side, and the third resistor (43) is on the ground side, and these are in series. Connected to
Of the two ends of the series resistor of the first resistor and the second resistor, the storage battery side is the first point (N11), the rotating electrical machine unit side is the second point (N12), the failure detection switch and the second resistor Between the three resistors is the third point (N13),
The acquisition unit
When the main switch is on and the failure detection switch is on, the voltage at the third point is acquired as the detection voltage,
Obtaining the voltage at the second point as the detection voltage when the main switch is off and the failure detection switch is on or off;
The failure determination unit
Based on the fact that the voltage at the third point when the main switch is on and the failure detection switch is on is substantially the same as the voltage at the first point, the first resistor or the first 2 Determine that the resistor is short-circuited,
The first resistor or the second resistor is opened based on the fact that the voltage at the second point when the main switch is off and the failure detection switch is on or off is substantially zero. The power supply system according to claim 4, wherein it is determined that a failure has occurred. The acquisition unit
When the main switch is on and the failure detection switch is on, the voltage at the third point is acquired as the detection voltage,
Obtaining the voltage at the third point as the detection voltage when the main switch is off and the failure detection switch is on;
The failure determination unit
Based on the fact that the voltage at the third point when the main switch is on and the failure detection switch is on is substantially zero, it is determined that the third resistor is short-circuited. ,
Based on the fact that the voltage at the third point when the main switch is off and the failure detection switch is on is substantially the same as the voltage at the first point, the third resistor has an open failure. The power supply system according to claim 5, wherein it is determined that the The acquisition unit
When the main switch is on and the failure detection switch is commanded off, the voltage at the third point is acquired as the detection voltage,
When the main switch is off and the failure detection switch is commanded on, the voltage at the third point is acquired as the detection voltage,
The failure determination unit
The failure detection is based on the fact that the voltage at the third point when the main switch is on and the failure detection switch is instructed to be off is an intermediate voltage between the storage battery voltage and 0V. Determine that the switch is short-circuited,
Based on the fact that the voltage at the third point when the main switch is off and the failure detection switch is instructed to be on is substantially zero, it is determined that the failure detection switch has an open failure. The power supply system according to claim 5 or 6. When the smoothing capacitor is charged by energization through the bypass path, the acquisition unit acquires the voltage on the rotating electrical machine unit side of both ends of the resistor as the detection voltage,
The failure determination unit measures the time required for charging the smoothing capacitor based on the voltage on the rotating electrical machine unit side, and based on the time required, the resistor is short-circuited. The power supply system according to claim 4 for determination. In the bypass path, a first resistor (41) and a second resistor (42) are connected in series as the resistor,
The acquisition unit acquires, as the detection voltage, voltages at both ends of the first resistor and the second resistor when the smoothing capacitor is charged by energization through the bypass path,
The failure determination unit calculates a voltage difference between both ends of the first resistor and a voltage difference between both ends of the second resistor based on voltages at both ends of the first resistor and the second resistor. In addition, the power supply system according to claim 4, wherein it is determined that the resistor is short-circuited based on a voltage difference between both ends of the first resistor and a voltage difference between both ends of the second resistor. A power supply system in which a branch resistor (83, 84) and a failure detection switch (85) are connected in series between both ends of the resistor in the bypass path between the rotating electrical machine unit side and the ground. There,
The acquisition unit acquires each voltage across the resistor in the bypass path as the detection voltage when the failure detection switch is on,
When the failure detection switch is on, the failure determination unit detects that the resistor has a short-circuit failure based on a voltage difference between both ends of the resistor in the bypass path being greater than 0 and less than or equal to a predetermined value. The power supply system according to claim 4, wherein it is determined that the While providing the storage battery as a first storage battery (11), the main switch as a first switch (SW1),
A second storage battery (12) connected in parallel to the first storage battery, closer to the rotating electrical machine unit than the first switch in the connection path;
A second switch (SW2) connected to the positive electrode side of the second storage battery;
A power supply system comprising:
The power supply system according to any one of claims 4 to 10, wherein the acquisition unit acquires the detection voltage in a state where the second switch is off.

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