JP2018182949A - Rotary electric machine control device and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine control device for appropriately performing power generation using a rotary electric machine.SOLUTION: A rotary electric machine ECU 23, which is applied to a power supply system including a bypass switch 35 being switched from a closed state to an open state when a start-up switch shifts from an off-state to an on-state, is communicably connected to an engine ECU 40 and receives a power generation instruction from the engine ECU 40 to generate power using a rotary electric machine unit 16. The rotary electric machine ECU 23 comprises: an autonomous power generation unit that when the power generation instruction from the engine ECU 40 has not been acquired in the case of the start-up switch being in the on-state, performs autonomous power generation using the rotary electric machine unit 16 regardless of the power generation instruction from the engine ECU 40; a time determination unit that determines whether or not a predetermined time has passed after the start-up switch became the on-state; and a restriction unit that restricts autonomous power generation by the autonomous power generation unit in a period until the time determination unit determines that the predetermined time has passed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine control device applied to a vehicle or the like, and a power supply system.

  Conventionally, as a power supply system for a vehicle, for example, a configuration including a plurality of storage batteries (for example, lead storage batteries, lithium ion storage batteries) and a rotating electrical machine connected in parallel to each storage battery is known (for example, patent Literature 1). In such a power supply system, a switch is provided between each storage battery and the rotating electric machine, and a bypass path always in parallel with the switch is usually provided to perform dark current supply and fail safe processing in the power off state. A closed relay is provided.

  Further, in such a power supply system, there are provided a rotating electrical machine control device for controlling the operation of the rotating electrical machine and a host control device for overall management of the same, and between the rotating electrical machine control device and the host control device Signal transmission is performed via a communication line such as a CAN bus. For example, when performing power generation by the rotating electrical machine in the power supply system, the host controller outputs a power generation command to the rotating electrical machine control device, and power is generated by the rotating electrical machine based on the power generation command. The generated power generated by the power generation is supplied to each storage battery and electric load.

  In addition, there is known a rotating electrical machine control device that performs autonomous power generation by a rotating electrical machine based on a predetermined target voltage regardless of a power generation command of a host control device. By this autonomous power generation, for example, even when the power generation command from the upper control apparatus is not obtained, it is possible to supply the power necessary for the operation of the vehicle.

JP 2011-234479 A

  By the way, in the autonomous power generation by the rotating electrical machine control device, it is conceivable that a predetermined amount of power generation is generated regardless of the conduction state of the electric path connecting the rotating electrical machine and each storage battery. In this case, it is considered that inconvenience occurs due to excessive power generation with respect to the conduction state of the electrical path. In particular, immediately after the ignition switch of the vehicle is turned on, a normal generated current path has not been established, and a conduction state is established through the bypass path. Therefore, for example, when the autonomous power generation is performed at the time of switching of the power supply path immediately after the ignition is turned on, the generated current unintentionally flows in 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 thereof is to provide a rotating electrical machine control device that appropriately performs power generation by the rotating electrical 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 electrical machine;
A first switch (31) provided closer to the first storage battery than a connection point with the rotating electrical machine in an electrical path between the first storage battery and the second storage battery;
A second switch (32) provided closer to the second storage battery than the connection point in the electric path;
A normally closed bypass switch (35) provided in a bypass path connecting one end side and the other end side of the first switch in the electric path;
Equipped with
The present invention is applied to a power supply system in which the bypass switch is switched from the closed state to the open state as the start switch is switched from the off state to the on state.
A rotating electrical machine control device (23) connected communicably to a host control device (40) and performing power generation by the rotating electrical machine by receiving a power generation command from the host control device,
An autonomous power generation unit that performs autonomous power generation by the rotating electrical machine regardless of the power generation command from the higher rank control device when the power generation command from the higher rank control device is not acquired in the ON state of the start switch When,
A time determination unit that determines whether a predetermined time has elapsed since the activation switch was turned on;
A restriction unit that restricts autonomous power generation by the autonomous power generation unit in a period until it is judged by the time judgment unit that the predetermined time has elapsed;
And the like.

  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 on each electric path of the first storage battery and the second storage battery, respectively. In the power supply system, each storage battery can be charged by closing (turning on) or opening (turning off) each switch while power is being generated by the rotating electrical machine. In addition, the rotary electric machine control device generates electric power by the rotary electric machine based on the power generation command of the host controller when the start switch is in the ON state, while when the power generation command from the host controller is not acquired, Implement autonomous power generation (autonomous power generation) by the rotating electric machine regardless of the situation. This makes it possible to supply the power necessary for the operation of the vehicle even when, for example, a communication error occurs.

  However, in the autonomous power generation, power generation is performed regardless of the conduction state of the electrical path outside the rotary electric machine. Therefore, in a configuration in which the bypass switch is switched from the closed state to the open state in response to the start switch turning from the off state to the on state, when autonomous power generation is performed before the bypass switch is opened, the bypass path is unintentionally The generated current flows. In this case, the bypass switch may be damaged.

  In this configuration, it is determined whether or not a predetermined time has elapsed since the start switch was turned on, and 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, the normal autonomous power generation is performed after the switching of the bypass switch is completed. Therefore, power can be supplied by autonomous power generation while suppressing generation current from flowing unintentionally in the bypass path. Thereby, the electric power generation by a rotary electric machine can be implemented appropriately.

  In the second means, the bypass path is a path whose allowable conduction current is smaller than that of the electrical path, and the predetermined time includes a time until the bypass switch is opened after the activation switch is turned on. The restriction unit stops the autonomous power generation in a period until it is determined by the time determination unit that the predetermined time has elapsed.

  In the configuration where the allowable conduction current of the bypass path is smaller than the electric path, if the generated current flows unintentionally in the bypass path, the bypass switch may be damaged. In this point, in the above configuration, the autonomous power generation is stopped until a predetermined time including the time from when the start switch is turned on to the time when the bypass switch is opened, so that the bypass path becomes conductive It can prevent autonomous power generation from being implemented. Thereby, it is possible to prevent the bypass switch from being damaged by the generated current accompanying the autonomous power generation.

  In the third means, the bypass path is a path whose allowable conduction current is smaller than that of the electrical path, and the predetermined time includes a time until the bypass switch is opened after the activation switch is turned on. The restriction unit restricts the generated current of the autonomous power generation to a value equal to or less than the allowable conduction current of the bypass path in a period until it is determined by the time determination unit that the predetermined time has elapsed.

  In the configuration where the allowable conduction current of the bypass path is smaller than the electric path, if the generated current flows unintentionally in the bypass path, the bypass switch may be damaged. In this respect, in the above configuration, the generated 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 opening of the start switch to opening of the bypass switch elapses. As a result, even when autonomous power generation is performed in a 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 includes a plurality of semiconductor switches (32a, 32b) connected in series, and the plurality of semiconductor switches are semiconductor switches whose parasitic diodes are in the opposite direction to each other. After the start switch is turned on, failure diagnosis of the second switch is performed in a state in which one of the semiconductor switches whose direction of the parasitic diode is one side and the other side is turned on. The predetermined time includes the time until the failure diagnosis of the second switch is completed after the activation switch is turned on, and the restriction unit determines the predetermined time by the time judgment unit. The autonomous power generation is stopped in a period until it is determined that the time has elapsed.

  In the power supply system, the second switch includes a plurality of semiconductor switches connected in series, and the plurality of semiconductor switches include semiconductor switches in which parasitic diodes are reversely directed to each other. Then, after the start switch is turned on, failure diagnosis of the second switch is performed in a state where one of the semiconductor switches whose parasitic diode is on one side and the other side is turned on. In this failure diagnosis, the second switch temporarily becomes conductive via the parasitic diode. However, at the time of failure diagnosis of the second switch, when the autonomous power generation is performed, the generated current unintentionally flows to the parasitic diode, which may cause the semiconductor switch to be damaged.

  In this configuration, the autonomous power generation is stopped until a predetermined time including the time until the failure diagnosis of the second switch is completed after the start switch is turned on, so that the power generation accompanying the autonomous power generation is performed. It is possible to prevent current from flowing to the parasitic diode of the semiconductor switch. Thereby, the semiconductor switch can be prevented from being damaged by the generated current accompanying the autonomous power generation.

  In a fifth means, the rotating electrical machine is a winding field type rotating electrical machine provided with a field winding (25), and the limiting unit is determined by the time determining unit to have the predetermined time elapsed. The autonomous power generation is limited by making the excitation current flowing through the field winding smaller than that during 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 through the field winding is made smaller than that during normal autonomous power generation. Therefore, it is possible to appropriately limit the generated current accompanying autonomous power generation.

  The following configuration may be provided as a power supply system. That is, in the sixth means, a rotary electric machine (16) drivingly connected to the engine output shaft and having respective functions of power generation and power running, and first storage battery (11) and second one connected in parallel to the rotary electric machine In an electrical path between the storage battery (12) and the first storage battery and the second storage battery, a first switch (31) provided closer to the first storage battery than a connection point with the rotating electrical machine, and the electricity In a path, a second switch (32) provided closer to the second storage battery than the connection point in a path, and a normally closed type provided in a bypass path connecting one end side and the other end side of the first switch in the electrical path And a bypass switch (35), wherein 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. Therefore, the rotating electrical machine has an autonomous power generation function that performs autonomous power generation regardless of the power generation command from the host controller in the on state of the start switch, and the start switch is turned on. The autonomous electric power generation by the rotating electrical machine is limited in a period from when the predetermined time passes.

The electric circuit diagram showing the power supply system of a 1st embodiment. FIG. 2 is a circuit diagram showing an electrical configuration of a rotating electrical machine unit. The flowchart which shows the process sequence of the autonomous power generation by rotary electric machine ECU. The time chart for demonstrating the process of the autonomous power generation by rotary electric machine ECU. The flowchart which shows the process sequence of the autonomous power generation by rotation electrical machinery ECU of a modification. The figure which shows the electricity supply state after switching of the electric power feeding path | route immediately after ignition ON. The figure which shows the electricity supply state at the time of failure diagnosis of a switch. The electric circuit diagram which shows the power supply system of another example.

First Embodiment
Hereinafter, an embodiment of the present invention will be described based on the drawings. In this embodiment, in a vehicle traveling with an engine (internal combustion engine) as a drive source, an on-vehicle power supply system for supplying power to various devices of the vehicle is embodied.

  As shown in FIG. 1, the present 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. Power can be supplied to the various electric loads 14 and 15 and the rotating electrical machine unit 16. In addition, the storage batteries 11 and 12 can be charged by the rotating electrical 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 known general purpose storage battery. On the other hand, the lithium ion storage battery 12 is a high-density storage battery with less power loss during charge and discharge, higher power density, and higher energy density than the lead storage battery 11. The lithium ion storage battery 12 may be a storage battery having high energy efficiency at the time of charge and discharge as compared with the lead storage battery 11. In addition, the lithium ion storage battery 12 is configured as a battery pack including a plurality of single cells. The rated voltages of these storage batteries 11 and 12 are all the same, for example, 12V.

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

  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 them, the electric load 15 includes a constant voltage required load which is required to be stable so that the voltage of the supplied power fluctuates within a predetermined or at least a predetermined range. On the other hand, the electrical load 14 is a general electrical load other than the constant voltage required load. The electrical load 15 can be said to be a protected load. Further, it can be said that the electrical load 15 is a load whose power supply failure is not tolerated, and the electrical load 14 is a load whose power supply failure is tolerated compared to the electrical load 15.

  Specific examples of the electric load 15 which is a constant voltage required load include navigation devices, audio devices, meter devices, and various ECUs such as an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, the occurrence of unnecessary reset or the like in each of the above devices is suppressed, 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 heater for a rear window defroster, 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 alternating current motor, an inverter 22 as a power conversion device, and a rotary electric machine ECU 23 that controls the operation of the rotary electric machine 21. The rotary electric machine 21 in the rotary electric machine unit 16 is a generator with a motor function, and is configured as a mechanical-electrical integrated ISG (Integrated Starter Generator).

  Here, the electrical configuration of the rotating electrical machine unit 16 will be described with reference to FIG. The rotary electric machine 21 includes U-phase, V-phase, and W-phase phase windings 24U, 24V, 24W as three-phase stator windings, and a field winding 25. The rotating shaft of the rotating electrical machine 21 is drivingly connected to the engine output shaft (not shown) by a belt, and while the rotating shaft of the rotating electrical machine 21 is rotated by the rotation of the engine output shaft, the rotation shaft of the rotating electrical machine 21 is rotated Engine output shaft rotates. That is, the rotating electrical machine unit 16 has a power generation function that generates power (regenerative power generation) by the rotation of the engine output shaft and the axle, and a power running function that applies 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 a DC voltage input from the battery unit U into an AC voltage and outputs it to the phase windings 24U, 24V and 24W. The inverter 22 is a bridge circuit having upper and lower arms equal in number to the number of phases of the phase winding, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 also configures a drive circuit that drives the rotating electrical machine 21 by adjusting the power supplied to the rotating electrical machine 21.

  The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase. In the present embodiment, voltage-controlled semiconductor switching elements are used as the switches Sp and Sn. 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) disposed opposite to the inner circumferential side of the stator core. The excitation current flows through the field winding 25 to magnetize the field pole. An alternating voltage is output from each phase winding 24U, 24V, 24W by the rotating magnetic field generated when the field pole is magnetized.

  An intermediate connection point of the series connection of switches Sp and Sn in each phase is connected to one end of each phase winding 24U, 24V, 24W. Further, a voltage sensor 26 for detecting the voltage at the input and output 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 for detecting the current flowing through each of the phase windings 24U, 24V, 24W, and a current sensor 28 for detecting the current flowing through the field winding 25. Detection signals of the sensors 26 to 28 are appropriately input to the rotating electrical machine ECU 23. Although not shown, the rotary electric machine 21 is provided with a rotation angle sensor for detecting rotor angle information, and the inverter 22 is provided with a signal processing circuit for processing a signal from the rotation angle sensor. There is.

  The rotating electrical machine ECU 23 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. Further, the rotating electrical machine ECU 23 includes an IC regulator 23a, and adjusts the excitation current flowing through the field winding 25 by the IC regulator 23a. The IC regulator 23a is configured to include a field switch (for example, an N-channel MOSFET) not shown, and performs on / off control of the field switch. 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 the power generation by the rotating electrical machine unit 16, the field switch is on / off controlled such that the voltage of the output terminal B detected by the voltage sensor 26 becomes the target voltage Vtg. As a result, the excitation current flowing through the field winding 25 is adjusted, and the generated voltage of the rotating electrical machine unit 16 (the output voltage to the battery unit U) is controlled.

  Further, the rotating electrical machine ECU 23 controls the inverter 22 to drive the rotating electrical machine 21 after the start of traveling of the vehicle to assist the driving force of the engine. In addition, the rotating electrical machine ECU 23 may drive the rotating electrical machine 21 at the time of engine start to apply initial rotation to the engine output shaft. In FIG. 1, it is preferable that the lead storage battery 11 be connected to the rotating electrical 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, as an electric path in the unit, an electrification path L1 connecting the output terminals P1 and P2 and an electrification path connecting the connection point N1 on the electrification path L1 and the lithium ion storage battery 12 L2 is provided. Among these, the switch 31 is provided in the conduction path L1, and the switch 32 is provided in the conduction path L2. In terms of the electrical path connecting lead storage battery 11 and lithium ion storage battery 12, switch 31 is provided on the side of lead storage battery 11 with respect to connection point N1 with rotating electrical machine unit 16 and lithium ion than connection point N1. A switch 32 is provided on the storage battery 12 side. The switch 31 corresponds to a "first switch", and the switch 32 corresponds to a "second switch".

  Each of the switches 31 and 32 includes 2 × n MOSFETs (semiconductor switching elements), and the parasitic diodes of the two sets of MOSFETs are connected in series in opposite directions to each other. In FIG. 1, the parasitic diodes of the respective MOSFETs are connected to each other at their anodes. The parasitic diode completely shuts off the current flowing through the path provided with the switches when the switches 31 and 32 are turned 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 a branch path L3 is connected to a connection point N2 between the output terminal P1 and the switch 31 in the conduction path L1, and a connection point N3 between the lithium ion storage battery 12 and the switch 32 is in the conduction path L2. One end of the branch path L4 is connected, and the other ends of the branch paths L3 and L4 are connected at the midpoint N4. Further, the middle point N4 and the output terminal P4 are connected by the conduction path L5. The switches 33 and 34 are provided in the branch paths L3 and L4, respectively. The switches 33 and 34 are configured in the same manner as the switches 31 and 32. That is, in each of the switches 33 and 34, two MOSFETs whose parasitic diodes are opposite to each other are connected in series. Then, power can be supplied from the storage batteries 11 and 12 to the electric load 15 through the paths L3 to L5.

  The battery unit U is provided with bypass paths L6 and L7 connectable to the lead storage battery 11, the electric load 15, and the rotating electrical machine unit 16 without the switches 31 to 34 in the unit. Specifically, the battery unit U is provided with a bypass path L6 connecting the output terminal P3 and the connection point N1 on the conduction path L1, and a bypass path L7 connecting 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. The bypass switch 35 is provided on the bypass path L6, and the 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). Moreover, by closing both bypass switches 35 and 36, the lead storage battery 11 and the electrical load 15 are electrically connected even if all the switches 31 to 34 are off (open). It is also possible to provide bypass path L6 and bypass switch 35 outside battery unit U.

  The battery unit U includes a battery ECU 37 that controls on / off (opening and closing) of the switches 31 to 34 and the bypass switches 35 and 36. The battery ECU 37 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The battery ECU 37 controls the on / off of each of the switches 31 to 34 based on the storage state of each of the storage batteries 11 and 12 and a command value from the engine ECU 40 which is a host control device. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, battery ECU 37 calculates SOC (remaining capacity: State Of Charge) of lithium ion storage battery 12 and controls the charge amount and discharge amount of lithium ion storage battery 12 such that the SOC is maintained within a predetermined use range. Do.

  An engine ECU 40 as a high-order control device that comprehensively manages the respective ECUs 23 and 37 is connected to the rotating electrical machine ECU 23 of the rotating electrical machine unit 16 and the battery ECU 37 of the battery unit U. The engine ECU 40 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface and the like, and controls the operation of the engine 42 based on the engine operating state and the vehicle traveling state at each time.

  These ECUs 23, 37, and 40 are connected by a communication line 41 constructing a communication network such as CAN, and can communicate with each other, and bi-directional communication is performed at a predetermined cycle. Thereby, various data stored in each of the ECUs 23, 37, and 40 can be shared with each other.

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

  The rotating electrical machine unit 16 also has an autonomous power generation function that performs autonomous power generation regardless of a power generation command from the engine ECU 40. Specifically, in the case where the power generation command from the engine ECU 40 is not acquired while the ignition switch (start switch) of the vehicle is turned on, for example, the rotating electrical machine ECU 23 has a communication abnormality between the rotating electrical machine ECU 23 and the engine ECU 40 When it occurs, the autonomous electric power generation by the rotating electrical machine unit 16 is performed. As a result, power necessary for the operation of the vehicle is supplied even when an abnormality occurs.

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

  In the above power supply system, when the ignition switch of the vehicle is off, the switches 31 to 34 are off (opened) and the bypass switches 35 and 36 are closed. In such a state, power is supplied from the lead storage battery 11 to the electric load 15 via the bypass paths L6 and L7. The allowable conduction current of the bypass paths L6 and L7 is smaller than that of the conduction paths L1 and L2.

  Then, when the ignition switch changes from the off state to the on state, the 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 conduction path is established through the bypass paths L6 and L7. Therefore, for example, when the electric power generation unit 16 performs autonomous power generation at the time of switching of the power feeding path to the electric load 15 immediately after ignition on, the generated current unintentionally flows in the bypass paths L6 and L7, and the bypass switches 35, 36 And the fuse 51 may be broken.

  Therefore, in the present embodiment, it is determined whether or not a predetermined time T1 has elapsed since the ignition switch was turned on, and the autonomous electric power generation by the rotating electrical machine unit 16 is determined until it is determined that the predetermined time T1 has elapsed. To limit. Specifically, the rotating electrical machine ECU 23 stops the autonomous power generation by the rotating electrical machine unit 16 by controlling the excitation current. That is, immediately after the ignition is turned on, the generated current associated with the autonomous power generation is prevented from flowing to 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 an extra time to the time until the switching from the closed state to the open state of the bypass switches 35, 36 is completed. That is, in this case, the rotating electrical machine ECU 23 stops the autonomous power generation at least until the switching of the power feeding path to the electric load 15 immediately after the ignition is turned on.

  The autonomous power generation process performed by the rotating electrical machine ECU 23 will be described using the flowchart of FIG. 3. This process is repeatedly performed by the rotating electrical machine ECU 23 at a predetermined cycle.

  In step S11, it is determined whether the ignition switch is on. If step S11 is YES, it will progress to step S12, and if step S11 is NO, this processing will be ended as it is. In step S12, it is determined whether a communication abnormality has occurred with the engine ECU 40. A well-known method can be used for determination of communication abnormality. For example, when the confirmation signal from the engine ECU 40 can not be received, the rotating electrical machine ECU 23 determines that the communication abnormality has occurred. If step S12 is YES, it will progress to step S13 because it is necessary to implement an autonomous power generation. On the other hand, if step S12 is NO, this processing is ended as it is.

  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 will implement the autonomous power generation by the rotary electric machine unit 16. In this case, power generation is performed such that the output voltage of the rotating electrical machine unit 16 becomes a predetermined voltage VA. On the other hand, if step S13 is NO, it will progress to step S15 and will stop autonomous power generation. For example, the rotary electric machine ECU 23 stops the autonomous power generation by turning off (open) the field switch so that the excitation current does not flow in the field winding 25. At this time, the autonomous electric power generation by the rotating electrical machine unit 16 is stopped until a predetermined time T1 elapses after the ignition switch is turned on.

  In FIG. 3, step S13 corresponds to the “time determination unit”, step S14 corresponds to the “autonomous power generation unit”, and step S15 corresponds to the “limit unit”.

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

  Before timing t11, the ignition switch is turned off. During this time, 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 of 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 timing t14. In addition, in order to prevent that the electric power feeding to the electric load 15 is interrupted, the period (timing t13-t14) which made the closed state of the switch overlap is provided.

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

  Assuming that autonomous power generation is started at timing t12 when it is determined that a 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, there is a concern that the fuse 51 may be melted, but as described above, the autonomous power generation is stopped until the switching of the power supply path to the electric load 15 is completed, whereby the melting of the fuse 51 is avoided.

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

  In the above configuration, it is determined whether or not a predetermined time T1 has elapsed since the ignition switch was turned on, and autonomous power generation is limited in a 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 generation current from flowing unintentionally to the bypass paths L6 and L7. Thereby, the electric power generation by the rotary electric machine unit 16 can be appropriately implemented.

  Specifically, the autonomous 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, 36 are opened has elapsed. In this case, since the autonomous power generation is not performed in a state where the bypass paths L6 and L7 are conducted, the generated current does not flow to the bypass paths L6 and L7. As a result, breakage of the bypass switches 35 and 36 and melting of the fuse 51 due to the generated current can be prevented.

  In addition, since the autonomous power generation is stopped by blocking the exciting current flowing through the field winding 25 by the field switch, it is preferable that the generated current accompanying the autonomous power generation flows unintentionally to the bypass paths L6 and L7. Can be prevented.

(Another example of the first embodiment)
In the above embodiment, the autonomous electric power generation by the rotating electrical machine unit 16 is stopped until the switching of the power supply path to the electric load 15 is completed after the ignition switch is turned on. It is also good. For example, the generated current of the autonomous power generation by the rotating electrical machine unit 16 may be limited to the allowable conduction current of the bypass paths L6 and L7 or less.

  Such a configuration will be described with reference to the flowchart of FIG. The present process is repeatedly performed by the rotating electrical machine ECU 23 at a predetermined cycle in place of FIG. 3 described above. In FIG. 5, the same processes as in FIG. 3 are assigned 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, 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 from the ignition on (step If S13 is NO), the process proceeds to step S16. In step S16, the generated voltage is limited so as to be equal to or less than the allowable conduction current of the bypass paths L6 and L7, and the autonomous electric power generation by the rotary electric machine unit 16 is performed. The generated voltage in this case is set based on, for example, the allowable energization current (for example, 30 A) of the fuse 51, and is a value smaller than the predetermined voltage VA at the time of normal autonomous power generation. At this time, the rotating electrical machine ECU 23 limits the generated voltage by making the excitation current smaller than the predetermined current IA at the time of normal autonomous power generation. In such a configuration, step S16 corresponds to the "restriction unit".

  In the above configuration, the generated current of the autonomous power generation by the rotating electrical machine unit 16 is bypassed until the predetermined time T1 including the time from when the ignition switch is turned on to when the bypass switches 35, 36 are opened passes. Since the restriction is made to be equal to or less than the allowable conduction current of L7, 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 autonomous power generation is limited by making the excitation current flowing through the field winding 25 smaller than the predetermined current IA at the time of autonomous power generation, so a generated current larger than the allowable conduction current is unintentionally Flow in the bypass paths L6 and L7 can be suitably prevented.

Second Embodiment
As described above, immediately after the ignition switch of the vehicle is turned on, the feed path to the electric load 15 is switched. Here, FIG. 6 shows the energization state of the power supply system after the switching of the feeding path is completed. In FIG. 6, the switches 31 and 33 are 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, 34 for controlling the charge and discharge of the lithium ion storage battery 12 are off (opened), and the bypass switches 35, 36 are opened. Then, in such a state immediately after the ignition is turned on, failure diagnosis of the switches 32, 34 is performed. The failure diagnosis of the switches 32 and 34 will be described below.

  As shown in FIG. 1 described above, in each of the switches 32 and 34, two MOSFETs whose parasitic diode directions are opposite to each other are connected in series. That is, the switch 32 is composed of a switch 32a and a switch 32b, and the switch 34 is composed of a switch 34a and a switch 34b. In failure diagnosis, one of the switches in each of the switches 32 and 34 is simultaneously turned on (closed). 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 directions of the parasitic diodes of the respective switch parts are the same.

  For example, FIG. 7 shows failure diagnosis when the switch 32a and the switch 34a are simultaneously turned on. In FIG. 7, when the terminal voltage of the lead storage battery 11 is larger than the terminal voltage of the lithium ion storage battery 12, a current flows in the lithium ion storage battery 12 via the switch part 32a and the parasitic diode of the switch part 32b. Similarly, current flows in the lithium ion storage battery 12 through the switch portion 34a and the parasitic diode of the switch portion 34b. In such a case, by detecting the current flowing into the lithium ion storage battery 12, it is understood that the switch portion 32a and the switch portion 34a are operating normally.

  On the other hand, when the terminal voltage of the lithium ion storage battery 12 is larger than the terminal voltage of the lead storage battery 11, when the switch portion 32b and the switch portion 34b are simultaneously turned on, current flows out from the lithium ion storage battery 12. That is, current flows from the lithium ion storage battery 12 through the switch portion 32b and the parasitic diode of the switch portion 32a, and current flows from the lithium ion storage battery 12 through the switch portion 34b and the parasitic diode of the switch portion 34a. In such a case, by detecting the current flowing out of the lithium ion storage battery 12, it is grasped that the switch portion 32b and the switch portion 34b operate normally.

  As described above, in the failure diagnosis of the switches 32 and 34, one of the switches in each switch is simultaneously turned on. 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, when autonomous power generation is performed by the rotating electrical 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 unintentionally flows to the parasitic diode of the switch portion 32b, which may cause the switch portion 32b to be damaged. The same applies to the switch unit 34b.

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

  The autonomous power generation process of the rotating electrical machine ECU 23 in the second embodiment is performed based on the above-described flowchart of FIG. 3. 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, 34 is completed after the ignition switch is turned on. The predetermined time T2 may be set, for example, by adding an extra time to the time until the failure diagnosis of the switches 32, 34 is completed. The rotary electric machine ECU 23 carries out step S13 using this 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 first embodiment. Is set longer than the predetermined time T1 (T2> T1). The other processes are as described above.

  In the above configuration, the autonomous electric power generation by the rotating electrical machine unit 16 is stopped until the predetermined time T2 including the time from when the ignition switch is turned on until the failure diagnosis of the switches 32, 34 is completed has elapsed. In this case, since the autonomous power generation is not performed when the switch portions 32a and 34a are turned on, the generated current does not flow to the parasitic diodes of the switch portions 32b and 34b. Thus, damage to the switch portions 32b and 34b due to the generated current can be prevented.

(Other embodiments)
In the above embodiment, the lead storage battery 11, the starter 13, and the electrical 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 electrical load 15 is connected to the output terminal P4. Although rotary electric machine ECU23 was applied to the power supply system, you may apply to another power supply system. For example, the rotary electric machine ECU 23 may be applied to a power supply system in which the electric load 15 and the rotary electric machine unit 16 are connected to the output terminal P2 without providing the output terminal P4 in the power supply system.

  Such a power supply system will be described with reference to FIG. In FIG. 8, for convenience of description, the same reference numerals are given to the configuration according to FIG. 1 described above, and the description will be omitted as appropriate.

  In the battery unit U shown in FIG. 8, the lead storage battery 11, the starter 13, and the electrical load 14 are connected to the output terminals P1 and P3, and the rotating electrical machine unit 16 and the electrical load 15 are connected to the output terminal P2. In the battery unit U, the switch 31 is provided in the conduction path L1, and the switch 32 is provided in the conduction path L2. The configuration of each of the switches 31 and 32 is as described above. Further, a bypass switch 35 is provided in the bypass path L6. In this case, by closing the bypass switch 35, the lead storage battery 11 and the electrical 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 conduction path L5 in 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 power supply system, when the ignition switch is turned off, power is supplied from the lead storage battery 11 to the electric load 15 via the bypass path L6. Then, along with the ignition switch being turned on, the feeding path to the electric load 15 is switched. 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. In addition, after the switching of the feed path to the electrical load 15, failure diagnosis of the switch 32 is performed. That is, each switch part 32a, 32b of the switch 32 is turned on (closed). As described above, also in the power supply system described above, the conduction state of the power supply system greatly changes immediately after the ignition is turned on. Therefore, when autonomous power generation is performed under such a state, problems may occur due to the generated current.

  Therefore, also in the power supply system described above, it is possible to prevent the melting of the fuse 51 and the failure of the switch 32 by limiting the autonomous power generation by the rotating electrical machine unit 16 until a predetermined time passes immediately after the ignition is turned on.

  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, other high density storage batteries, for example, a nickel-hydrogen battery may be used. In addition, it is also possible to use a capacitor as at least one storage battery.

  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 electrical machine;
A first switch (31) provided closer to the first storage battery than a connection point with the rotating electrical machine in an electrical path between the first storage battery and the second storage battery;
A second switch (32) provided closer to the second storage battery than the connection point in the electric path;
A normally closed bypass switch (35) provided in a bypass path connecting one end side and the other end side of the first switch in the electric path;
Equipped with
The present invention is applied to a power supply system in which the bypass switch is switched from the closed state to the open state as the start switch is switched from the off state to the on state.
A rotating electrical machine control device (23) connected communicably to a host control device (40) and performing power generation by the rotating electrical machine by receiving a power generation command from the host control device,
An autonomous power generation unit that performs autonomous power generation by the rotating electrical machine regardless of the power generation command from the higher rank control device when the power generation command from the higher rank control device is not acquired in the ON state of the start switch When,
A time determination unit that determines whether a predetermined time has elapsed since the activation switch was turned on;
A restriction unit that restricts autonomous power generation by the autonomous power generation unit in a period until it is judged by the time judgment unit that the predetermined time has elapsed;
A rotating electrical machine control device comprising: The bypass path is a path having a smaller allowable conduction current than the electrical path,
The predetermined time includes a time until the bypass switch is opened after the activation switch is turned on,
The rotating electrical machine control device according to claim 1, wherein the restriction unit stops the autonomous power generation in a period until it is determined by the time determination unit that the predetermined time has elapsed. The bypass path is a path having a smaller allowable conduction current than the electrical path,
The predetermined time includes a time until the bypass switch is opened after the activation switch is turned on,
The restriction unit limits the generated current of the autonomous power generation to a value equal to or less than the allowable conduction current of the bypass path in a period until it is determined by the time determination unit that the predetermined time has elapsed. The rotating electrical machine control unit. 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 opposite to each other,
A power supply system in which failure diagnosis of the second switch is performed in a state in which one of the semiconductor switches whose parasitic diodes are on one side and the other side are turned on after the start switch is turned on. Applies to
The predetermined time includes the time until the failure diagnosis of the second switch is completed after the activation switch is turned on,
The rotating electrical machine control device according to claim 1, wherein the restriction unit stops the autonomous power generation in a period until it is determined by the time determination unit that the predetermined time has elapsed. The rotating electric machine is a winding field type rotating electric machine provided with a field winding (25),
The restriction unit makes the excitation current flowing through the field winding smaller than that during autonomous power generation in a period until it is determined by the time determination unit that the predetermined time has elapsed. The rotary electric machine control device according to any one of claims 1 to 4, which restricts typical 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 electrical machine;
A first switch (31) provided closer to the first storage battery than a connection point with the rotating electrical machine in an electrical path between the first storage battery and the second storage battery;
A second switch (32) provided closer to the second storage battery than the connection point in the electric path;
And a normally closed bypass switch (35) provided in a bypass path connecting one end side and the other end side of the first switch in the electrical path;
A power supply system in which the bypass switch is switched from a closed state to an open state in response to the activation switch turning from an off state to an on state,
The rotating electrical machine has an autonomous power generation function that performs autonomous power generation regardless of a power generation command from the host controller in the on state of the start switch, and a predetermined time after the start switch is turned on A power supply system in which autonomous power generation by the rotating electrical machine is limited in a period until e.

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