JP6683167B2 - Rotating electric machine control device and power supply system - Google Patents

Description

  The present invention relates to a rotary electric machine control device and a power supply system applied to a vehicle or the like.

  BACKGROUND ART Conventionally, for example, as a power supply system for a vehicle, a configuration is known in which a plurality of storage batteries (for example, a lead storage battery, a lithium-ion storage battery) are provided, and a rotary electric machine that is connected in parallel to each of these storage batteries is provided (for example, patents Reference 1). In such a power supply system, a switch is provided between each storage battery and the rotary electric machine, and in order to perform dark current supply and fail-safe processing in a power-off state, a bypass path parallel to the switch is always provided. A closed relay is provided.

  Further, in such a power supply system, a rotating electric machine control device that controls the operation of the rotating electric machine and a host control device that collectively manages the rotating electric machine control device are provided, and between the rotating electric machine control device and the host control device. In, signal transmission is performed via a communication line such as a CAN bus. For example, when power is generated by the rotary electric machine in the power supply system, a power generation command is output from the host controller to the rotary electric machine controller, and power is generated by the rotary electric machine based on the power generation command. The generated power generated by power generation is supplied to each storage battery and electric load.

  Further, there is known a rotary electric machine control device that performs autonomous power generation by a rotary electric machine based on a predetermined target voltage regardless of a power generation command from a host control device. By this autonomous power generation, for example, even when the power generation command from the host controller is not acquired, it is possible to supply the electric power necessary for the operation of the vehicle.

JP, 2011-234479, A

  By the way, in the autonomous power generation by the rotating electric machine control device, it is conceivable that a predetermined amount of power generation is generated irrespective of the conduction state of the electric path connecting the rotating electric machine and each storage battery. In this case, it is considered that an inconvenience occurs due to excessive power generation with respect to the conduction state of the electric path. In particular, immediately after the ignition switch of the vehicle is turned on, the normal power generation current path is not established and the vehicle is in a conductive state through the bypass path. Therefore, for example, if autonomous power generation is performed at the time of switching the power feeding path immediately after the ignition is turned on, the generated current may unintentionally flow into the bypass path and the bypass path may be broken.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a rotary electric machine control device that appropriately performs power generation by a rotary electric machine.

In the first way,
A rotating electric machine (16) drivingly connected to the engine output shaft and having functions of power generation and power running;
A first storage battery (11) and a second storage battery (12) connected in parallel to the rotating electric machine;
A first switch (31) provided on a side of the first storage battery with respect to a connection point with the rotating electric machine in an electric path between the first storage battery and the second storage battery;
A second switch (32) provided on the electric path closer to the second storage battery than the connection point;
A normally closed bypass switch (35) provided on a bypass path connecting one end side and the other end side of the first switch in the electric path;
Equipped with
It is applied to a power supply system in which the bypass switch is switched from a closed state to an open state as the start switch is switched from the off state to the on state,
A rotating electric machine control device (23) that is communicably connected to a higher control device (40), and receives electric power generation command from the upper control device to perform power generation by the rotating electric machine.
When the power generation command from the host control device is not acquired in the ON state of the start switch, an autonomous power generation unit that performs autonomous power generation by the rotating electric machine regardless of the power generation command from the host control device. When,
A time determination unit that determines whether or not a predetermined time has elapsed since the start switch was turned on,
In a period until it is determined that the predetermined time has elapsed by the time determination unit, a restriction unit that restricts autonomous power generation by the autonomous power generation unit,
It is characterized by including.

  A rotating electric machine and a first storage battery and a second storage battery connected in parallel to the rotating electric machine are provided, and a first switch and a second switch are provided in each electric path of the first storage battery and the second storage battery. In the power supply system, each storage battery can be charged by closing (on) or opening (off) each switch while power is being generated by the rotating electric machine. Further, the rotating electrical machine control device performs power generation by the rotating electrical machine based on the power generation command of the higher-order control device when the start switch is in the ON state, and when the power generation command from the higher-order control device has not been acquired, the power generation command is issued. Independently, the rotating electric machine performs autonomous power generation (autonomous power generation). This makes it possible to supply the electric power necessary for the operation of the vehicle even when a communication abnormality occurs, for example.

  However, the autonomous power generation is performed regardless of the conduction state of the electric path outside the rotating electric machine. Therefore, in the configuration in which the bypass switch is switched from the closed state to the open state as the start switch is turned from the off state to the on state, if the autonomous power generation is performed before opening the bypass switch, the bypass path is unintentionally Generated current flows. In such a case, the bypass switch may be damaged.

  In this point, in the above configuration, it is determined whether or not a predetermined time has elapsed since the start switch was turned on, and the autonomous power generation is limited in a period until it is determined that the predetermined time has elapsed. In this case, by limiting the autonomous power generation until the predetermined time elapses, for example, normal autonomous power generation is performed after the switching of the bypass switch is completed. Therefore, it is possible to supply electric power by autonomous power generation while suppressing the generation current from unintentionally flowing in the bypass path. Thereby, power generation by the rotating electric machine can be properly performed.

  In the second means, the bypass path has a smaller allowable energizing current than the electric path, and the predetermined time period includes a time period from when the start switch is turned on until the bypass switch is opened. Therefore, the limiting unit stops the autonomous power generation until the time determining unit determines that the predetermined time has elapsed.

  In a configuration in which the allowable energization current of the bypass path is smaller than that of the electric path, there is a possibility that the bypass switch may be damaged if the generated current unintentionally flows in the bypass path. In this regard, in the above configuration, since the autonomous power generation is stopped until a predetermined time including the time from when the start switch is turned on to when the bypass switch is opened, the bypass path is in a conductive state. It is possible to prevent the autonomous power generation from being carried out. As a result, it is possible to prevent the bypass switch from being damaged by the generated current due to the autonomous power generation.

  In the third means, the bypass path is a path having a smaller allowable energizing current than the electric path, and the predetermined time includes a time until the bypass switch is opened after the start switch is turned on. Therefore, the limiting unit limits the generated current of the autonomous power generation to the allowable energization current of the bypass path or less during the period until the time determination unit determines that the predetermined time has elapsed.

  In a configuration in which the allowable energization current of the bypass path is smaller than that of the electric path, there is a possibility that the bypass switch may be damaged if the generated current unintentionally flows in the bypass path. In this respect, in the above configuration, the power generation current of the autonomous power generation is limited to the allowable conduction current of the bypass path or less until a predetermined time including the time from when the start switch is turned on to when the bypass switch is opened. Therefore, even if the autonomous power generation is performed in the state where the bypass path is conductive, it is possible to prevent the bypass switch from being damaged.

  In the fourth means, the second switch has a plurality of semiconductor switches (32a, 32b) connected in series, and the plurality of semiconductor switches are semiconductor switches whose parasitic diodes are in opposite directions. After the start switch is turned on, the failure diagnosis of the second switch is performed in a state where one of the semiconductor switches in which the direction of the parasitic diode is one side and the other side is turned on. Applied to the power supply system, the predetermined time period includes a time period until the failure diagnosis of the second switch is completed after the start switch is turned on, and the limiting unit determines the predetermined time period by the time determining unit. The autonomous power generation is stopped until the time is determined to have elapsed.

  In the above power supply system, the second switch has a plurality of semiconductor switches connected in series, and the plurality of semiconductor switches include semiconductor switches in which parasitic diodes are in opposite directions. Then, after the start-up switch is turned on, the failure diagnosis of the second switch is performed with one of the semiconductor switches in which the parasitic diodes are oriented on one side and the other side is turned on. In this failure diagnosis, the second switch is temporarily turned on via the parasitic diode. However, at the time of failure diagnosis of the second switch, if autonomous power generation is performed, a generated current will unintentionally flow through the parasitic diode, which may cause damage to the semiconductor switch.

  In this point, in the above configuration, the autonomous power generation is stopped until a predetermined time including the time from the start switch being turned on to the time when the failure diagnosis of the second switch is completed. It is possible to prevent current from flowing to the parasitic diode of the semiconductor switch. As a result, it is possible to prevent the semiconductor switch from being damaged by the generated current due to the autonomous power generation.

  In a fifth means, the rotating electric machine is a winding field type rotating electric machine including a field winding (25), and the limiting unit determines that the predetermined time has passed by the time determining unit. Until that time, the exciting current flowing through the field winding is made smaller than that during the autonomous power generation, thereby limiting the autonomous power generation.

  In the above configuration, in the period from when the start switch is turned on to when it is determined that the predetermined time has elapsed, the excitation current flowing in the field winding is set to be smaller than that during normal autonomous power generation. As a result, the generated current associated with autonomous power generation can be appropriately limited.

  The power supply system may have the following configuration. That is, in the sixth means, a rotating electric machine (16) drivingly connected to the engine output shaft and having functions of power generation and power running, a first storage battery (11) and a second storage battery (11) connected in parallel to the rotating electric machine are provided. A storage battery (12), a first switch (31) provided on a side of the first storage battery which is closer to the first storage battery than a connection point with the rotating electric machine in an electric path between the first storage battery and the second storage battery, and A normally closed type switch provided in a bypass path that connects the second switch (32) provided on the side of the second storage battery with respect to the connection point in the path and the one end side and the other end side of the first switch in the electrical path. A bypass switch (35), and the bypass switch is switched from a closed state to an open state when the start switch is turned from the off state to the on state. Thus, the rotating electrical machine has an autonomous power generation function for performing autonomous power generation in the ON state of the start switch regardless of the power generation command from the host controller, and the start switch is in the ON state. After that, the autonomous electric power generation by the rotating electric machine is limited in the period from the elapse of a predetermined time.

The electric circuit diagram which shows the power supply system of 1st Embodiment. FIG. 3 is a circuit diagram showing an electrical configuration of a rotary electric machine unit. The flowchart which shows the process sequence of the autonomous electric power generation by rotary electric machine ECU. 7 is a time chart for explaining a process of autonomous power generation by the rotating electrical machine ECU. The flowchart which shows the process sequence of the autonomous electric power generation by the rotary electric machine ECU of a modification. The figure which shows the electricity supply state after switching the electric power feeding path immediately after ignition-on. The figure which shows the electricity supply state at the time of switch failure diagnosis. The electric circuit diagram which shows the power supply system of another example.

(First embodiment)
Embodiments embodying the present invention will be described below with reference to the drawings. In the present embodiment, in a vehicle that travels using an engine (internal combustion engine) as a drive source, an in-vehicle power supply system that supplies electric power to various devices of the vehicle is embodied.

  As shown in FIG. 1, the present power supply system is a two-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. From each storage battery 11, 12, a starter 13 or It is possible to supply power to various electric loads 14 and 15 and the rotary electric machine unit 16. Further, the storage batteries 11 and 12 can be charged by the rotating electric machine unit 16. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 16, and the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the electric 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 charge and discharge and higher output density and energy density than the lead storage battery 11. The lithium ion storage battery 12 is preferably a storage battery having higher energy efficiency during charging and discharging than the lead storage battery 11. Further, the lithium-ion storage battery 12 is configured as an assembled battery including a plurality of single cells. The rated voltage of each of these storage batteries 11 and 12 is the same, for example, 12V.

  Although a detailed description is omitted by way of illustration, the lithium-ion storage battery 12 is housed in a housing case and configured as a battery unit U integrated with a substrate. The battery unit U has output terminals P1, P2, P3 and P4, among which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminals P1 and P3, and the rotary electric machine unit is connected to the output terminal P2. 16 is connected, and the electric load 15 is connected to the output terminal P4.

  The electric loads 14 and 15 have different requirements for the voltage of the electric power supplied from the storage batteries 11 and 12. Among them, 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 required load. It can be said that the electric load 15 is a protected load. Further, it can be said that the electric load 15 is a load in which the power failure is not allowed and the electric load 14 is a load in which the power failure is allowed as compared with the electric load 15.

  Specific examples of the electric load 15 that is the constant voltage required load include a navigation device, an audio device, a meter device, and various ECUs such as an engine ECU. In this case, since the voltage fluctuation of the supplied power is suppressed, unnecessary resets and the like are suppressed from occurring in each of the above devices, and stable operation can be realized. The electric load 15 may include a traveling system actuator such as an electric steering device or a brake device. Further, specific examples of the electric load 14 include a seat heater, a defroster heater for a rear window, a headlight, a wiper for a front window, a blower fan for an air conditioner, and the like.

  The rotary electric machine unit 16 includes a rotary electric machine 21 as a three-phase AC motor, an inverter 22 as a power converter, and a rotary electric machine ECU 23 that controls the operation of the rotary electric machine 21. In the rotary electric machine unit 16, the rotary electric machine 21 is a generator with a motor function, and is configured as an electromechanical integrated ISG (Integrated Starter Generator).

  Here, the electrical configuration of the rotary electric machine unit 16 will be described with reference to FIG. The rotary electric machine 21 includes U-phase, V-phase, and W-phase windings 24U, 24V, and 24W as a three-phase stator winding, and a field winding 25. The rotating shaft of the rotating electric machine 21 is drivingly connected to an engine output shaft (not shown) by a belt, and the rotating shaft of the rotating electric machine 21 rotates by the rotation of the engine output shaft, while the rotating shaft of the rotating electric machine 21 rotates. The engine output shaft rotates. That is, the rotary electric machine unit 16 has a power generation function of generating power (regenerative power generation) by rotation of the engine output shaft and the axle, and a power running function of imparting a rotational force to the engine output shaft.

  The inverter 22 converts the AC voltage output from each phase winding 24U, 24V, 24W into a DC voltage and outputs the DC voltage to the battery unit U. Further, the inverter 22 converts the DC voltage input from the battery unit U into an AC voltage and outputs the AC voltage to the phase windings 24U, 24V, 24W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phases of the phase winding, and constitutes a three-phase full-wave rectification circuit. The inverter 22 also constitutes a drive circuit that drives the rotating electric machine 21 by adjusting the electric power supplied to the rotating electric machine 21.

  The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase. In this embodiment, voltage-controlled semiconductor switching elements are used as the switches Sp and Sn, and specifically, N-channel MOSFETs are used. An upper arm diode Dp is connected in antiparallel to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel to the lower arm switch Sn.

  The field winding 25 constitutes a rotor, and is wound around a field pole (not shown) which is arranged to face the inner peripheral side of the stator core. When the exciting current flows through the field winding 25, the field pole is magnetized. An alternating voltage is output from each phase winding 24U, 24V, 24W by the rotating magnetic field generated when the field pole is magnetized.

  The intermediate connection point of the series connection of the switches Sp and Sn in each phase is connected to one end of each phase winding 24U, 24V, 24W. Further, a voltage sensor 26 that detects the input / output voltage of the inverter 22 is provided between the high-voltage side path and the low-voltage side path of the inverter 22. In addition, the rotating electrical machine unit 16 is provided with a current sensor 27 that detects a current flowing through each phase winding 24U, 24V, 24W and a current sensor 28 that detects a current flowing through the field winding 25. Detection signals from the sensors 26 to 28 are appropriately input to the rotary electric machine ECU 23. Although not shown, the rotary electric machine 21 is provided with a rotation angle sensor that detects angle information of the rotor, and the inverter 22 is provided with a signal processing circuit that processes a signal from the rotation angle sensor. There is.

  The rotary electric machine ECU 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. Further, the rotary electric machine ECU 23 includes an IC regulator 23a, and the IC regulator 23a adjusts the exciting current flowing through the field winding 25. The IC regulator 23a includes a field switch (not shown) (for example, N-channel MOSFET), and controls the field switch to be turned on / off. Specifically, the excitation current is adjusted by changing the Duty value indicating the ratio of the energization period in one control cycle (constant period) of the field switch. For example, in power generation by the rotary electric machine unit 16, the field switch is controlled to be turned on / off so that the voltage of the output terminal B detected by the voltage sensor 26 becomes the target voltage Vtg. As a result, the exciting current flowing through the field winding 25 is adjusted, and the power generation voltage of the rotary electric machine unit 16 (the output voltage to the battery unit U) is controlled.

  Further, the rotary electric machine ECU 23 controls the inverter 22 to drive the rotary electric machine 21 after the vehicle starts traveling to assist the driving force of the engine. Further, the rotary electric machine ECU 23 may drive the rotary electric machine 21 at the time of starting the engine so as to impart initial rotation to the engine output shaft. In FIG. 1, the lead storage battery 11 may be connected to the rotating electric machine ECU 23.

  Next, the electrical configuration of the battery unit U will be described. As shown in FIG. 1, in the battery unit U, an energization path L1 that connects the output terminals P1 and P2, and an energization path that connects the connection point N1 on the energization path L1 and the lithium-ion storage battery 12 as an in-unit electric path. L2 and are provided. Of these, the switch 31 is provided in the energizing path L1 and the switch 32 is provided in the energizing path L2. As for the electrical path connecting the lead storage battery 11 and the lithium ion storage battery 12, the switch 31 is provided closer to the lead storage battery 11 than the connection point N1 with the rotating electric machine unit 16, and is a lithium ion connection than the connection point N1. A switch 32 is provided on the side of the storage battery 12. The switch 31 corresponds to the “first switch”, and the switch 32 corresponds to the “second switch”.

  Each of these switches 31 and 32 includes 2 × n MOSFETs (semiconductor switching elements), and the parasitic diodes of the pair of MOSFETs are connected in series so as to be in opposite directions. In FIG. 1, the parasitic diodes of each MOSFET are connected to each other at their anodes. By this parasitic diode, when each of the switches 31 and 32 is turned off, the current flowing through the path provided with the switch is completely cut off. In each of the switches 31 and 32, the parasitic diodes of the MOSFETs may be connected to each other at their cathodes.

  One end of the branch path L3 is connected to the connection point N2 between the output terminal P1 and the switch 31 in the energization path L1, and the connection point N3 between the lithium ion storage battery 12 and the switch 32 in the energization path L2. One end of the branch route L4 is connected, and the other ends of these branch routes L3, L4 are connected at an intermediate point N4. Further, the intermediate point N4 and the output terminal P4 are connected by the energizing path L5. A switch 33 and a switch 34 are provided on the branch paths L3 and L4, respectively. These switches 33 and 34 are configured similarly to the switches 31 and 32. That is, each of the switches 33 and 34 is connected in series with two MOSFETs in which the directions of the parasitic diodes are opposite to each other. Then, power can be supplied from each of the storage batteries 11 and 12 to the electric load 15 through each of the paths L3 to L5.

  The battery unit U is provided with bypass paths L6 and L7 that can be connected to the lead storage battery 11, the electric load 15, and the rotary electric machine unit 16 without passing through the switches 31 to 34 in the unit. Specifically, the battery unit U is provided with a bypass path L6 that connects the output terminal P3 and the connection point N1 on the energization path L1, and a bypass path L7 that connects the connection point N1 and the output terminal P4. It is provided. The output terminal P3 is connected to the lead storage battery 11 via the fuse 51. A bypass switch 35 is provided on the bypass path L6, and a bypass switch 36 is provided on the bypass path L7. Each bypass switch 35, 36 is a normally closed relay switch.

  By closing the bypass switch 35, the lead storage battery 11 and the rotating electrical machine unit 16 are electrically connected even if the switch 31 is off (open). Further, by closing both bypass switches 35 and 36, the lead storage battery 11 and the electric load 15 are electrically connected even if all the switches 31 to 34 are off (open). The bypass path L6 and the bypass switch 35 may be provided outside the battery unit U.

  The battery unit U includes a battery ECU 37 that controls ON / OFF (opening / closing) of the switches 31 to 34 and the bypass switches 35 and 36. The battery ECU 37 is composed of a microcomputer including a CPU, a ROM, a RAM, an input / output interface and the like. The battery ECU 37 controls on / off of each of the switches 31 to 34 based on a storage state of each of the storage batteries 11 and 12 and a command value from the engine ECU 40 that is a higher-level control device. As a result, the lead storage battery 11 and the lithium ion storage battery 12 are selectively used to perform charging / discharging. For example, the battery ECU 37 calculates the SOC (remaining capacity: State Of Charge) of the lithium ion storage battery 12, and controls the charge amount and the discharge amount of the lithium ion storage battery 12 so that the SOC is maintained within a predetermined usage range. To do.

  An engine ECU 40 is connected to the rotary electric machine ECU 23 of the rotary electric machine unit 16 and the battery ECU 37 of the battery unit U as a host control device that comprehensively manages the ECUs 23 and 37. The engine ECU 40 is composed of a microcomputer including a CPU, a ROM, a RAM, an input / output interface, etc., and controls the operation of the engine 42 based on the engine operating state and the vehicle traveling state at each time.

  These ECUs 23, 37, 40 are connected by a communication line 41 that constructs a communication network such as CAN and can communicate with each other, and bidirectional communication is carried out at a predetermined cycle. As a result, various data stored in each ECU 23, 37, 40 can be shared with each other.

  Power generation by the rotary electric machine unit 16 is basically performed based on a power generation command from the engine ECU 40. For example, when the engine ECU 40 determines that the SOC of the lithium ion storage battery 12 is equal to or lower than a predetermined value via signal transmission with the battery ECU 37, the engine ECU 40 transmits a power generation command to the rotating electrical machine ECU 23. Then, the rotary electric machine ECU 23 sets the target voltage Vtg based on the power generation command, and controls the exciting current flowing through the field winding 25 so that the generated voltage becomes the target voltage Vtg.

  Further, the rotary electric machine unit 16 has an autonomous power generation function for performing autonomous power generation regardless of a power generation command from the engine ECU 40. Specifically, when the electric power generation command from the engine ECU 40 is not acquired while the vehicle ignition switch (starting switch) is turned on, the rotating electrical machine ECU 23 determines that a communication abnormality occurs between the rotating electrical machine ECU 23 and the engine ECU 40, for example. When it occurs, the rotating electric machine unit 16 performs autonomous power generation. As a result, the electric power required to operate the vehicle is supplied even when an abnormality occurs.

  The autonomous power generation is performed so that the voltage of the output terminal B of the rotary electric machine unit 16 (output voltage for the battery unit U) maintains a predetermined voltage VA (for example, 14V). In such a case, the exciting current flowing through the field winding 25 is controlled to the predetermined current IA corresponding to the predetermined voltage VA. In this autonomous power generation, a predetermined power generation voltage is generated regardless of the conduction state outside the rotary electric machine unit 16, that is, the conduction state of each of the paths L1 to L7 in the power supply system.

  By the way, in the above power supply system, when the ignition switch of the vehicle is off, the switches 31 to 34 are off (open) and the bypass switches 35 and 36 are closed. In this state, electric power is supplied from the lead storage battery 11 to the electric load 15 via the bypass paths L6 and L7. The allowable energizing currents of the bypass paths L6 and L7 are smaller than those of the energizing paths L1 and L2.

  Then, when the ignition switch is switched from the off state to the on state, the power feeding path from the lead storage battery 11 to the electric load 15 is changed. At this time, the switches 31 and 33 are turned on (closed), and the bypass switches 35 and 36 are switched from the closed state to the open state. That is, immediately after the ignition switch of the vehicle is turned on, the normal power supply path is not established, and the vehicle is in the conductive state through the bypass paths L6 and L7. Therefore, for example, when autonomous electric power generation is performed by the rotating electrical machine unit 16 at the time of switching the power feeding path to the electric load 15 immediately after the ignition is turned on, the generated current unintentionally flows to the bypass paths L6 and L7, and the bypass switches 35 and 36. May be damaged or the fuse 51 may be blown.

  Therefore, in the present embodiment, it is determined whether or not the predetermined time T1 has elapsed after the ignition switch is turned on, and the autonomous electric power generation by the rotating electrical machine unit 16 is performed during the period until it is determined that the predetermined time T1 has elapsed. I tried to limit. Specifically, the rotary electric machine ECU 23 stops the autonomous power generation by the rotary electric machine unit 16 by controlling the exciting current. That is, immediately after the ignition is turned on, the generated current due to the autonomous power generation is prevented from flowing in the bypass paths L6 and L7.

  The predetermined time T1 is set to include the time until the bypass switches 35 and 36 are opened after the ignition switch is turned on. The predetermined time T1 may be set, for example, by adding a margin time to the time until the switching of the bypass switches 35 and 36 from the closed state to the open state is completed. That is, in this case, the rotary electric machine ECU 23 stops the autonomous power generation at least until the switching of the power feeding path to the electric load 15 is completed immediately after the ignition is turned on.

  The autonomous power generation process performed by the rotary electric machine ECU 23 will be described with reference to the flowchart of FIG. This processing is repeatedly executed by the rotary electric machine ECU 23 at a predetermined cycle.

  In step S11, it is determined whether or not the ignition switch is on. If step S11 is YES, it will progress to step S12, and if step S11 is NO, this process will be complete | finished as it is. In step S12, it is determined whether or not a communication abnormality has occurred with the engine ECU 40. A known method can be used to determine the communication abnormality. For example, the rotating electrical machine ECU 23 determines that the communication abnormality has occurred when the confirmation signal from the engine ECU 40 cannot be received. If step S12 is YES, it will be necessary to implement autonomous power generation and the process proceeds to step S13. On the other hand, if step S12 is NO, this process ends.

  In step S13, it is determined whether or not a predetermined time T1 has elapsed since the ignition switch was turned on. The predetermined time T1 is set to include, for example, the time required to switch the bypass switches 35 and 36 from the closed state to the open state. If step S13 is YES, it will progress to step S14 and the autonomous electric power generation by the rotary electric machine unit 16 will be implemented. In this case, power generation is performed so that the output voltage of the rotary electric machine unit 16 becomes the predetermined voltage VA. On the other hand, if step S13 is NO, the process proceeds to step S15 to stop the autonomous power generation. For example, the rotating electrical machine ECU 23 stops the autonomous power generation by turning off (opening) the field switch so that the exciting current does not flow through the field winding 25. At this time, the autonomous electric power generation by the rotary electric machine unit 16 is stopped until a predetermined time T1 has elapsed since the ignition switch was turned on.

  Note that, in FIG. 3, step S13 corresponds to a "time determination unit", step S14 corresponds to an "autonomous power generation unit", and step S15 corresponds to a "limitation unit".

  Subsequently, FIG. 4 shows a timing chart showing the processing of FIG. 3 more specifically. First, the state of each switch in the battery unit U will be described.

  Before the timing t11, the ignition switch is off. During this period, the bypass switches 35 and 36 are closed, and power is supplied from the lead storage battery 11 to the electric load 15 via the bypass paths L6 and L7. Then, when the ignition switch is turned on at timing t11, an on command for the switches 31 and 33 is generated, and the switches 31 and 33 are turned on (closed) at timing t13. Then, after the switches 31 and 33 and the bypass switches 35 and 36 are closed, the bypass switches 35 and 36 are opened at the timing t14. In addition, in order to prevent the power supply to the electric load 15 from being interrupted, a period (timing t13 to t14) in which the closed states of the switches are overlapped is provided.

  Subsequently, processing in the rotary electric machine unit 16 will be described. In the ON state of the ignition switch, the rotary electric machine ECU 23 determines whether there is a communication abnormality with the engine ECU 40. Then, when it is determined that the communication abnormality occurs at the timing t12, the autonomous power generation is performed. However, at timing t12, the autonomous power generation is stopped (prohibited) because the predetermined time T1 has not elapsed since the ignition was turned on. Then, the autonomous power generation is performed after the timing t15 after the elapse of the predetermined time T1. At time t15, the switching of the power feeding path to the electric load 15 has already been completed. The timings t14 to t15 correspond to the margin time.

  If the autonomous power generation is started at the timing t12 when it is determined that the communication abnormality has occurred, the bypass switches 35 and 36 are still in the closed state, and therefore excessive current may flow to the bypass paths L6 and L7. is there. In such a case, the fuse 51 may be blown, but as described above, the blown fuse 51 is avoided by stopping the autonomous power generation until the switching of the power feeding path to the electric load 15 is completed.

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

  In the above configuration, it is determined whether or not the predetermined time T1 has elapsed since the ignition switch was turned on, and the autonomous power generation is limited during the period until it is determined that the predetermined time T1 has elapsed. In this case, by limiting the autonomous power generation until the predetermined time T1 elapses, it is possible to supply the power by the autonomous power generation while suppressing the generated current from unintentionally flowing to the bypass paths L6 and L7. Thereby, the electric power generation by the rotary electric machine unit 16 can be appropriately performed.

  Specifically, the autonomous electric power generation by the rotating electrical machine unit 16 is stopped until a predetermined time T1 including the time from when the ignition switch is turned on to when the bypass switches 35 and 36 are opened. In this case, since the autonomous power generation is not performed while the bypass paths L6 and L7 are conducting, the generated current does not flow to the bypass paths L6 and L7. This prevents damage to the bypass switches 35 and 36 and blowout of the fuse 51 due to the generated current.

  Further, since the autonomous power generation is stopped by cutting off the exciting current flowing through the field winding 25 by the field switch, it is preferable that the generated current accompanying the autonomous power flow unintentionally flows through the bypass paths L6, L7. Can be prevented.

(Another example of the first embodiment)
In the above-described embodiment, the configuration in which the autonomous electric power generation by the rotating electrical machine unit 16 is stopped until the switching of the power feeding path to the electric load 15 is completed after the ignition switch is turned on, is changed. Good. For example, the configuration may be such that the generated current of autonomous power generation by the rotary electric machine unit 16 is limited to the allowable energization current of the bypass paths L6 and L7.

  Such a configuration will be described with reference to the flowchart of FIG. This processing is repeatedly executed by the rotary electric machine ECU 23 at a predetermined cycle in place of FIG. 3 described above. In FIG. 5, the same steps as those in FIG. 3 are designated by the same step numbers to simplify the description. The change from the process of FIG. 3 is the replacement from step S15 to step S16.

  In FIG. 5, when the ignition switch is turned on and it is determined that the communication abnormality has occurred (when both steps S11 and S12 are YES), and the predetermined time T1 has not elapsed since the ignition was turned on (step If S13 is NO), the process proceeds to step S16. In step S16, the power generation voltage is limited so as to be equal to or less than the allowable energization current of the bypass paths L6, L7, and the autonomous electric power generation by the rotating electrical machine unit 16 is performed. The power generation voltage in such a case is set based on, for example, the allowable energization current of the fuse 51 (for example, 30 A), and is a value smaller than the predetermined voltage VA during normal autonomous power generation. At this time, the rotary electric machine ECU 23 limits the generated voltage by making the exciting current smaller than the predetermined current IA during normal autonomous power generation. In such a configuration, step S16 corresponds to the "limiter".

  In the above configuration, until the predetermined time T1 including the time from when the ignition switch is turned on to when the bypass switches 35 and 36 are opened, the generated electric current of the autonomous electric power generation by the rotating electrical machine unit 16 is passed through the bypass path L6. Since it is limited to the allowable energizing current of L7 or less, it is possible to prevent the bypass switches 35 and 36 from being damaged while generating electric power by the rotary electric machine unit 16.

  In the above configuration, the exciting current flowing through the field winding 25 is set to be smaller than the predetermined current IA at the time of autonomous power generation to limit the autonomous power generation. Therefore, a power generation current larger than the allowable energizing current is not intended. It can be preferably prevented from flowing into the bypass paths L6 and L7.

(Second embodiment)
As described above, the power supply path to the electric load 15 is switched immediately after the ignition switch of the vehicle is turned on. Here, FIG. 6 shows the energized state of the power supply system after the switching of the power feeding path is completed. In FIG. 6, the switches 31 and 33 are turned on (closed), and power is supplied from the lead storage battery 11 to the electric load 15 via the switch 33. On the other hand, the switches 32 and 34 for controlling the charging / discharging of the lithium ion storage battery 12 are off (open), and the bypass switches 35 and 36 are open. Then, in such a state immediately after the ignition is turned on, the failure diagnosis of the switches 32 and 34 is performed. The failure diagnosis of the switches 32 and 34 will be described below.

  As shown in FIG. 1 described above, each of the switches 32 and 34 has two MOSFETs in which the directions of the parasitic diodes are opposite to each other connected in series. That is, the switch 32 includes a switch unit 32a and a switch unit 32b, and the switch 34 includes a switch unit 34a and a switch unit 34b. In the failure diagnosis, one of the switches 32 and 34 is turned on (closed) at the same time. Specifically, with respect to the lithium ion storage battery 12, the switch parts of the respective switches are simultaneously turned on in a combination in which the parasitic diodes of the respective switch parts have the same direction.

  For example, FIG. 7 shows a failure diagnosis when the switch unit 32a and the switch unit 34a are turned on at the same time. In FIG. 7, when the terminal voltage of the lead storage battery 11 is higher than the terminal voltage of the lithium ion storage battery 12, a current flows through the lithium ion storage battery 12 through the switch part 32a and the parasitic diode of the switch part 32b. Similarly, a current flows through the lithium ion storage battery 12 via the switch section 34a and the parasitic diode of the switch section 34b. In such a case, the current flowing into the lithium-ion storage battery 12 is detected to recognize that the switch unit 32a and the switch unit 34a are operating normally.

  On the other hand, when the terminal voltage of the lithium ion storage battery 12 is higher than the terminal voltage of the lead storage battery 11, if the switch part 32b and the switch part 34b are turned on simultaneously, an electric current will flow out from the lithium ion storage battery 12. That is, current flows from the lithium ion storage battery 12 via the switch part 32b and the parasitic diode of the switch part 32a, and current flows from the lithium ion storage battery 12 via the switch part 34b and the parasitic diode of the switch part 34a. In such a case, by detecting the current flowing out from the lithium-ion storage battery 12, it is understood that the switch unit 32b and the switch unit 34b are operating normally.

  Thus, in the failure diagnosis of the switches 32 and 34, one of the switches is turned on at the same time in each switch. The failure diagnosis of the switch 32 and the failure diagnosis of the switch 34 may be performed separately. For example, in the failure diagnosis of the switch 32, the switch unit 32a and the switch unit 32b are turned on one by one.

  For example, when the switch units 32a and 34a are turned on in the failure diagnosis and the autonomous electric power generation is performed by the rotary electric machine unit 16, a generated current flows to the lithium ion storage battery 12 via the switch 32. In such a case, the generated current may unintentionally flow into the parasitic diode of the switch unit 32b, which may damage the switch unit 32b. The same applies to the switch unit 34b.

  Therefore, in the present embodiment, it is determined whether or not a predetermined time T2 including the time from when the ignition switch is turned on until the failure diagnosis of the switches 32 and 34 is completed, and the predetermined time T2 has passed. The autonomous electric power generation by the rotary electric machine unit 16 is limited during the period until it is determined that the electric power is generated. Specifically, the rotary electric machine ECU 23 stops the autonomous electric power generation by the rotary electric machine unit 16. That is, immediately after the ignition is turned on, the generated current due to the autonomous power generation does not flow to the parasitic diodes of the switch parts 32b and 34b.

  The autonomous power generation process of the rotary electric machine ECU 23 in the second embodiment is performed based on the above-described flowchart of FIG. The change from the first embodiment is the change of the processing content of step S13. In the second embodiment, the predetermined time T2 is set to include the time until the failure diagnosis of the switches 32 and 34 is completed after the ignition switch is turned on. The predetermined time T2 may be set, for example, by adding a margin time to the time until the failure diagnosis of the switches 32 and 34 is completed. The rotary electric machine ECU 23 executes step S13 using the predetermined time T2. Here, since the failure diagnosis of the switches 32 and 34 is performed after the switching of the power feeding path to the electric load 15 immediately after the ignition is turned on, the predetermined time T2 in the second embodiment is the same as in the first embodiment. Is set longer than the predetermined time T1 (T2> T1). The other processing is as described above.

  In the above-described configuration, the autonomous electric power generation by the rotary electric machine unit 16 is stopped until a predetermined time T2 including the time from when the ignition switch is turned on to when the failure diagnosis of the switches 32 and 34 is completed. In this case, since the autonomous power generation is not performed with the switch parts 32a and 34a turned on, the generated current does not flow to the parasitic diodes of the switch parts 32b and 34b. This can prevent the switch parts 32b and 34b from being damaged by the generated current.

(Other embodiments)
In the above embodiment, the lead storage battery 11, the starter 13, and the electric load 14 are connected to the output terminals P1 and P3, the rotating electrical machine unit 16 is connected to the output terminal P2, and the electric load 15 is connected to the output terminal P4. Although the rotary electric machine ECU 23 is applied to the power supply system, it may be applied to other power supply systems. For example, the rotary electric machine ECU 23 may be applied to a power supply system in which the output terminal P4 is not provided in the above power supply system and the output terminal P2 is connected to the electric load 15 and the rotary electric machine unit 16.

  Such a power supply system will be described with reference to FIG. In FIG. 8, for convenience of description, configurations similar to those of FIG. 1 described above are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the battery unit U shown in FIG. 8, the lead storage battery 11, the starter 13, and the electric load 14 are connected to the output terminals P1 and P3, and the rotary electric machine unit 16 and the electric load 15 are connected to the output terminal P2. In the battery unit U, the switch 31 is provided in the energization path L1 and the switch 32 is provided in the energization path L2. The configurations of the switches 31 and 32 are as described above. A bypass switch 35 is provided on the bypass path L6. In this case, by closing the bypass switch 35, the lead storage battery 11 and the electric load 15 are electrically connected even if the switch 31 is off (open). In the power supply system of FIG. 8, the branch paths L3 and L4 and the energization path L5 of the power supply system of FIG. 1 are omitted, and accordingly, the switches 33 and 34 and the bypass switch 36 are also omitted.

  In the above power supply system, when the ignition switch is turned off, electric power is supplied from the lead storage battery 11 to the electric load 15 via the bypass path L6. Then, the power supply path to the electric load 15 is switched in association with the ignition switch being turned on. At this time, the switch 31 is turned on (closed), and the bypass switch 35 is switched from the closed state to the open state. Further, after the switching of the power supply path to the electric load 15, the failure diagnosis of the switch 32 is performed. That is, the switch parts 32a and 32b of the switch 32 are turned on (closed). As described above, even in the power supply system described above, the conduction state of the power supply system changes greatly immediately after the ignition is turned on. Therefore, if autonomous power generation is performed under such a state, there is a possibility that inconvenience may occur due to the generated current.

  Therefore, in the above power supply system as well, by limiting the autonomous power generation by the rotary electric machine unit 16 immediately after the ignition is turned on until a predetermined time elapses, it is possible to prevent the fuse 51 from being blown and the switch 32 from being broken.

  In the above embodiment, the lead storage battery 11 is provided as the storage battery, and the lithium ion storage battery 12 is provided, but this may be changed. For example, instead of the lithium-ion storage battery 12, a high-density storage battery other than that, for example, a nickel-hydrogen battery may be used. In addition, it is also possible to use a capacitor as at least one of the storage batteries.

  11 ... Lead storage battery, 12 ... Lithium ion storage battery, 31, 32 ... Switch, 16 ... Rotating electric machine unit, 32 ... Rotating electric machine ECU, 35 ... Bypass switch, 40 ... Engine ECU.

Claims (6)

A rotating electric machine (16) drivingly connected to the engine output shaft and having functions of power generation and power running;
A first storage battery (11) and a second storage battery (12) connected in parallel to the rotating electric machine;
A first switch (31) provided on a side of the first storage battery with respect to a connection point with the rotating electric machine in an electric path between the first storage battery and the second storage battery;
A second switch (32) provided on the electric path closer to the second storage battery than the connection point;
A normally closed bypass switch (35) provided on a bypass path connecting one end side and the other end side of the first switch in the electric path;
Equipped with
It is applied to a power supply system in which the bypass switch is switched from a closed state to an open state as the start switch is switched from the off state to the on state,
A rotating electric machine control device (23) that is communicably connected to a higher control device (40), and receives electric power generation command from the upper control device to perform power generation by the rotating electric machine.
When the power generation command from the host control device is not acquired in the ON state of the start switch, an autonomous power generation unit that performs autonomous power generation by the rotating electric machine regardless of the power generation command from the host control device. When,
A time determination unit that determines whether or not a predetermined time has elapsed since the start switch was turned on,
In a period until it is determined that the predetermined time has elapsed by the time determination unit, a restriction unit that restricts autonomous power generation by the autonomous power generation unit,
A rotating electrical machine control device comprising: The bypass path is a path having a smaller allowable energizing current than the electric path,
The predetermined time includes a time until the bypass switch is opened after the start switch is turned on,
The rotary electric machine control device according to claim 1, wherein the limiting unit stops the autonomous power generation in a period until the time determination unit determines that the predetermined time has elapsed. The bypass path is a path having a smaller allowable energizing current than the electric path,
The predetermined time includes a time until the bypass switch is opened after the start switch is turned on,
The limiting unit limits the generated current of the autonomous power generation to the allowable energization current of the bypass path or less in a period until the time determination unit determines that the predetermined time has elapsed. Rotary electric machine control device. The second switch includes a plurality of semiconductor switches (32a, 32b) connected in series, and the plurality of semiconductor switches include semiconductor switches in which parasitic diodes are in opposite directions to each other.
A power supply system in which, after the start-up switch is turned on, a failure diagnosis of the second switch is performed in a state in which one of the semiconductor switches in which the parasitic diodes are directed to one side and the other side is turned on. Applied to
The predetermined time includes a time until the failure diagnosis of the second switch is completed after the start switch is turned on,
The rotary electric machine control device according to claim 1, wherein the limiting unit stops the autonomous power generation in a period until the time determination unit determines that the predetermined time has elapsed. The rotating electric machine is a wound field type rotating electric machine including a field winding (25),
In the period until the time determination unit determines that the predetermined time has elapsed, the limiting unit reduces the exciting current flowing in the field winding to a value smaller than that during the autonomous power generation. The rotary electric machine control device according to any one of claims 1 to 4, which limits electric power generation. A rotating electric machine (16) drivingly connected to the engine output shaft and having functions of power generation and power running;
A first storage battery (11) and a second storage battery (12) connected in parallel to the rotating electric machine;
A first switch (31) provided on a side of the first storage battery with respect to a connection point with the rotating electric machine in an electric path between the first storage battery and the second storage battery;
A second switch (32) provided on the electric path closer to the second storage battery than the connection point;
A normally closed bypass switch (35) provided on a bypass path connecting one end side and the other end side of the first switch in the electric path;
A power supply system in which the bypass switch is switched from a closed state to an open state with a start switch being turned on from an off state,
The rotating electrical machine has an autonomous power generation function for performing autonomous power generation regardless of a power generation command from the host controller when the start switch is on, and the start switch is on for a predetermined time. A power supply system in which autonomous power generation by the rotating electric machine is limited in a period until the time elapses.

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