JP6903951B2 - Power system - Google Patents

Description

The present invention relates to a power supply system using a plurality of storage batteries.

Conventionally, for example, as an in-vehicle power supply system mounted on a vehicle, a lead storage battery and a lithium ion storage battery are connected in parallel to a generator (for example, ISG), and the lead storage battery and the lithium are subjected to an electric load. There is a system in which an ion storage battery is connected in parallel (for example, Patent Document 1). In this in-vehicle power supply system, power is supplied to various electric loads while using two storage batteries properly, and the storage battery is selected to charge the power from the ISG.

In such a power supply system, a plurality of semiconductor switches are used to properly use the two storage batteries, and when the system is operated, the control unit appropriately controls the opening and closing of each switch. In addition, the power supply system is provided with a bypass relay in the bypass path that bypasses each switch in order to supply dark current to the electric load and fail-safe measures when the power supply system is not operating. Further, as a countermeasure against overcurrent flowing through the bypass path, a fuse is appropriately provided in the bypass path.

Japanese Unexamined Patent Publication No. 2015-93554

Here, in the power supply system, if an abnormality occurs in the control unit, the control of each switch becomes impossible, so that there is a concern that each switch is unintentionally opened and the power supply is lost due to the electric load. Further, when each switch is open, power supply can be considered through a bypass path, but in a situation where a large current flows through a rotating electric machine or the like, it is considered that the fuse is blown, and electricity is generated by the blown fuse. There is a concern that the power supply of the load will be lost.

The present invention has been made in view of the above problems, and a main object thereof is to provide a power supply system capable of suitably suppressing an unintended power failure of an electric device when an abnormality occurs in a control unit. is there.

Hereinafter, means for solving the above problems and their actions and effects will be described. In the following, for the sake of easy understanding, the reference numerals of the corresponding configurations in the embodiment of the invention are appropriately shown in parentheses or the like, but the present invention is not limited to the specific configurations shown in the parentheses or the like.

In the first means
A first storage battery (11) and a second storage battery (12) connected in parallel to the first electric path (L1) are provided, the first electric device (16) is connected to the first electric path, and both storage batteries are connected. A power supply system in which a second electric device (15) is connected to a second electric path (L2) provided in parallel with the first electric path between the two.
A first A switch (SW1A) provided on the side of the first storage battery with respect to the first connection point (N1) with the first electric device in a portion of the first electric path parallel to the second electric path. ,
A first B switch (SW1B) provided on the side of the second storage battery with respect to the first connection point in a portion of the first electric path parallel to the second electric path.
A second A switch (SW2A) provided on the side of the first storage battery with respect to the second connection point (N2) with the second electric device in the second electric path.
A second B switch (SW2B) provided on the side of the second storage battery with respect to the second connection point in the second electric path, and
A normally closed bypass switch (31, 62) provided in parallel with the second A switch, and
In the system operating state, the first A, the first B, the second A, and the second B switches are operated in the closed state in response to the energization request to the first electric device and the second electric device, and the bypass is performed. The switch control unit (51) that opens the switch and
It has.

By selectively operating the 1st A switch and the 1st B switch in the closed state in the operating state of the power supply system, at least one of the first storage battery and the second storage battery and the first electric device are operated via the first electric path. Energization is performed between and. Further, by selectively operating the second A switch and the second B switch in the closed state, electricity is supplied between at least one of the first storage battery and the second storage battery and the second electric device via the second electric path. Is done.

In such a case, if an abnormality occurs in the switch control unit, control for each of the first A, first B, second A, and second B switches becomes impossible, so that each of these switches is opened. However, since the normally closed bypass switch is closed, it is possible to continue energizing the second electric device from the first storage battery. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the second electric device. That is, it is possible to suitably suppress an unintended power failure of the electric device when an abnormality occurs in the control unit.

In the second means, the normally closed type first bypass switch (61) provided in the bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path, and the above. The bypass switch including a fuse (63) provided in the bypass path and provided in parallel with the second A switch is a second bypass switch (62), and the second electric in the first electric path. The switch control unit is provided in a bypass path (L12) connecting a branch point (N3) with the path and the second connection point, and the switch control unit is in the system operating state of the first bypass switch and the second bypass. The switch is opened.

In the above configuration, a normally closed type first bypass switch and a fuse are provided in the bypass path on the first A switch side, and the first A switch is opened when an abnormality occurs in the switch control unit, and the first bypass switch is opened. In the closed state, if an excessive current flows in the bypass path on the first A switch side, the fuse is blown accordingly. In this case, even if the first A, first B, second A, and second B switches are open and the fuse in the bypass path on the first A switch side is blown, the second bypass switch on the second A switch side is blown. By the closed state, it becomes possible to continue the energization from the first storage battery to the second electric device.

In the third means, the first electric device is a generator having a power generation function, includes a monitoring control unit (52,100) for monitoring the state of the switch control unit, and the monitoring control unit is the switch. When it is determined that the control unit is abnormal, the power generation control of the generator is performed while limiting the power generation so as not to blow the fuse.

In the above configuration, when an abnormality occurs in the switch control unit, the monitoring control unit executes power generation control while limiting power generation so as not to blow the fuse in the generator. As a result, the blown fuse on the bypass path on the first A switch side is avoided. Therefore, it is possible to supply electric power from the generator to the first storage battery via the bypass path on the first A switch side, and it is possible to realize continuous use of the first storage battery.

In the fourth means, when the switch control unit determines that the switch control unit is abnormal, the monitoring control unit controls the first A switch to a closed state and prevents the fuse from blowing under that state. The power generation control of the generator is carried out while limiting the power generation.

In this case, after an abnormality occurs in the switch control unit, the first storage battery and the generator (first electric device) are conducted through the first bypass switch and the first A switch. To. Then, under such a state, the power generation control of the generator is performed while limiting the power generation so as not to blow the fuse on the bypass path on the first A switch side. In this case, the permissible level of the generated power supplied from the generator to the first storage battery can be increased, and a more suitable configuration for charging the first storage battery can be realized.

In the fifth means, the normally open type or latch type first bypass switch (61) provided in the bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path. And the fuse (63) provided on the side of the first storage battery with respect to the first bypass switch in the bypass path, and the bypass switch provided in parallel with the second A switch is a second bypass. It is a switch (62), and is provided in a bypass branch path (L13) connecting an intermediate point (N5) between the first bypass switch and the fuse in the bypass path and the second connection point. The switch control unit opens the first bypass switch and the second bypass switch in the system operating state.

In the above configuration, a normally open type or latch type first bypass switch and a fuse are provided in the bypass path on the first A switch side, and the first bypass switch is opened when an abnormality occurs in the switch control unit. In this state, the fuse on the bypass path is prevented from being blown. Further, when the second bypass switch is closed, it becomes possible to continue energizing the second electric device from the first storage battery.

In this means, in particular, the bypass path connecting one end side and the other end side of the first A switch is branched in two directions. In short, one end side of the first A switch on the first storage battery side in the first electric path is the first. It is connected to one connection point (connection point with the first electric device in the first electric path) and second connection point (connection point with the second electric device in the second electric path), respectively. Further, in the bypass path, a fuse is provided in the path portion before branching extending from one end side of the first A switch. In such a case, when an abnormality occurs in the switch control unit, if the fuse is blown, it may not be possible to energize the second electric device. However, since the blown fuse is avoided as described above, the second electric device is supplied. Energization can be continued.

In the sixth means, the first electric device is a generator having a power generation function, includes a monitoring control unit (52,100) for monitoring the state of the switch control unit, and the monitoring control unit is the switch. When the control unit determines that there is an abnormality, the first A switch is controlled to the closed state.

In the above configuration, after an abnormality occurs in the switch control unit, the monitoring control unit closes the first A switch to conduct conduction between the generator (first electric device) and the first storage battery. In this case, continuous use of the first storage battery can be realized by appropriately charging the first storage battery with the generator.

In the configuration of the means 2, after an abnormality occurs in the switch control unit, the fuse on the bypass path on the first A switch side may be blown and the bypass path may be cut off. By closing the 1A switch, the generator (first electric device) and the first storage battery are electrically connected, and the first storage battery can be appropriately charged.

In the seventh means, the normally closed type first bypass switch (61) provided in the bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path, and the above. The first bypass switch includes a fuse (63) provided on the side of the first storage battery with respect to the first bypass switch, and a monitoring control unit (52,100) for monitoring the state of the switch control unit. The bypass switch provided in parallel with the 2A switch is a second bypass switch (62), which includes an intermediate point (N5) between the first bypass switch and the fuse in the bypass path and the second connection point. The switch control unit opens the first bypass switch and the second bypass switch in the system operating state, and the monitoring control unit is the switch. When the control unit determines that there is an abnormality, the first bypass switch is opened.

In the above configuration, a normally closed type first bypass switch and a fuse are provided in the bypass path on the first A switch side, and when an abnormality occurs in the switch control unit, the first A switch is opened and monitored. By opening the first bypass switch by the control unit, the blown fuse on the bypass path is avoided. Further, when the second bypass switch is closed, it becomes possible to continue energizing the second electric device from the first storage battery.

In this means, in particular, the bypass path connecting one end side and the other end side of the first A switch is branched in two directions. In short, one end side of the first A switch on the first storage battery side in the first electric path is the first. It is connected to one connection point (connection point with the first electric device in the first electric path) and second connection point (connection point with the second electric device in the second electric path), respectively. Further, in the bypass path, a fuse is provided in the path portion before branching extending from one end side of the first A switch. In such a case, when an abnormality occurs in the switch control unit, if the fuse is blown, it may not be possible to energize the second electric device. However, as described above, the blown fuse is avoided, so that the second electric device is supplied. Energization can be continued.

In the eighth means, when the switch control unit outputs a signal to shift the first bypass switch from the open state to the closed state, the delay section delays the state shift of the first bypass switch (the eighth bypass switch). 71), the delay unit delays the state transition of the first bypass switch until after the monitoring control unit opens the first bypass switch.

When an abnormality occurs in the switch control unit, if the first bypass switch is closed by stopping the open command from the switch control unit before the monitoring control unit controls the first bypass switch to the open state, the fuse becomes excessive. There is a risk that the fuse will blow due to excessive energization. When an abnormality occurs in the switch control unit, it may take time for the monitoring control unit to determine the abnormality. In this regard, in the above configuration, a delay unit for delaying the state transition of the first bypass switch is provided, and the delay unit delays the state transition of the first bypass switch until after the monitoring control unit opens the first bypass switch. I tried to let you. As a result, the blown fuse is avoided, and the energization of the second electric device can be continued.

In the ninth means, the monitoring control unit always opens the first bypass switch in the system operating state.

In the above configuration, when the system is operating, the first bypass switch is maintained in an open state before and after the occurrence of an abnormality in the switch control unit. Since the first bypass switch remains open, the fuse is prevented from blowing due to overcurrent.

In the tenth means, the first electric device is a generator having a power generation function, and the monitoring control unit closes the first A switch when the switch control unit determines that the switch control unit is abnormal. Control.

In the above configuration, after an abnormality occurs in the switch control unit, the monitoring control unit closes the first A switch to conduct conduction between the generator (first electric device) and the first storage battery. In this case, continuous use of the first storage battery can be realized by appropriately charging the first storage battery with the generator.

In the eleventh means, the first A switch has a plurality of switch units (21, 22) provided in parallel with each other, and each of the plurality of switch units has a power supply drive unit (41, 42). Is provided, and the plurality of switch units are operated in a closed state by a command signal input for each power supply drive unit.

In the above configuration, in the first A switch provided in the first electric path, a plurality of switch units parallel to each other are driven by individual power supply drive units to be operated in a closed state. In this case, even if a power failure occurs in any of the switch portions of the first A switch, the switch portion in which the power failure does not occur can be opened and closed. Therefore, after the occurrence of an abnormality in the switch control unit, it is possible to reliably supply power to the first storage battery by the power generation of the generator.

In the twelfth means
A first storage battery (11) and a second storage battery (12) connected in parallel to the first electric path (L1) are provided, the first electric device (16) is connected to the first electric path, and both storage batteries are connected. A power supply system in which a second electric device (15) is connected to a second electric path (L2) provided in parallel with the first electric path between the two.
A first A switch (SW1A) provided on the side of the first storage battery with respect to the first connection point (N1) with the first electric device in a portion of the first electric path parallel to the second electric path. ,
A first B switch (SW1B) provided on the side of the second storage battery with respect to the first connection point in a portion of the first electric path parallel to the second electric path.
A second A switch (SW2A) provided on the side of the first storage battery with respect to the second connection point (N2) with the second electric device in the second electric path.
A second B switch (SW2B) provided on the side of the second storage battery with respect to the second connection point in the second electric path, and
A normally closed type first bypass switch (61) provided in the first bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path.
A normally closed type second bypass switch (65) provided in the second bypass path (L14) connecting the first connection point and the second connection point, and
A fuse (63) provided in the first bypass path and
In the system operating state, the first A, the first B, the second A, and the second B switch are operated in the closed state in response to the energization request to the first electric device and the second electric device, and the first 1, the switch control unit (51) that opens the second bypass switch, and
A monitoring control unit (52,100) that monitors the status of the switch control unit, and
With
When the switch control unit determines that the switch control unit is abnormal, the monitoring control unit controls the second A switch to the closed state.

By selectively operating the 1st A switch and the 1st B switch in the closed state in the operating state of the power supply system, at least one of the first storage battery and the second storage battery and the first electric device are operated via the first electric path. Energization is performed between and. Further, by selectively operating the second A switch and the second B switch in the closed state, electricity is supplied between at least one of the first storage battery and the second storage battery and the second electric device via the second electric path. Is done.

In such a case, if an abnormality occurs in the switch control unit, control for the first A, first B, second A, and second B switches becomes impossible, so that each of these switches is opened and the first bypass path and the first bypass path are opened. The first storage battery and the second electric device are connected to each other via the second bypass path. At this time, if an excessive current flows through the first bypass path, the fuse is blown. However, since the second A switch is closed by the monitoring control unit, it is possible to continue energizing the second electric device from the first storage battery. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the second electric device. That is, it is possible to suitably suppress an unintended power failure of the electric device when an abnormality occurs in the control unit.

In the thirteenth means, when the switch control unit outputs a signal to shift the second A switch from the closed state to the open state, the delay section (82) delays the state shift of the second A switch. The delay unit delays the state transition of the first A switch until after the monitoring control unit closes the second A switch.

When an abnormality occurs in the switch control unit, if the second A switch is opened by stopping the closing command from the switch control unit before the monitoring control unit controls the second A switch to the closed state, the second electric device will be used. There is a risk of power failure. When an abnormality occurs in the switch control unit, it may take time for the monitoring control unit to determine the abnormality. In this regard, in the above configuration, a delay unit for delaying the state transition of the second A switch is provided, and the delay unit delays the state transition of the second A switch until after the monitoring control unit closes the second A switch. did. As a result, the power failure in the second electric device can be avoided, and the second electric device can be properly energized.

In the fourteenth means, the first electric device is a generator having a power generation function, and when the monitoring control unit determines that the switch control unit is abnormal, in addition to the second A switch, the first electric device is added to the second A switch. The first A switch is controlled to be closed.

In the above configuration, after an abnormality occurs in the switch control unit, the monitoring control unit closes the first A and second A switches, so that the generator (first electric device) and the first storage battery are electrically connected. .. In this case, continuous use of the first storage battery can be realized by appropriately charging the first storage battery with the generator.

The electric circuit diagram which shows the power supply system of 1st Embodiment. The circuit diagram which shows the structure of the drive part of the 1st A switch. A flowchart showing the monitoring process of the main control unit by the sub control unit. A time chart showing measures to be taken when an abnormality occurs in the main control unit. The electric circuit diagram which shows the power supply system of 2nd Embodiment. A time chart showing measures to be taken when an abnormality occurs in the main control unit. The electric circuit diagram which shows the power supply system of 3rd Embodiment. A time chart showing measures to be taken when an abnormality occurs in the main control unit. The figure which shows the structure about the relay drive in 4th Embodiment. A flowchart showing the monitoring process of the main control unit by the sub control unit. A time chart showing measures to be taken when an abnormality occurs in the main control unit. The electric circuit diagram which shows the power supply system of 5th Embodiment. The figure which shows the structure about the switch drive. A time chart showing measures to be taken when an abnormality occurs in the main control unit.

Hereinafter, embodiments will be described with reference to the drawings. In the present embodiment, in a vehicle traveling with 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. In each of the following embodiments, parts that are the same or equal to each other are designated by the same reference numerals in the drawings, and the description thereof will be incorporated for the parts having the same reference numerals.

(First Embodiment)
As shown in FIG. 1, this power supply system is a dual power supply system having a lead storage battery 11 as a first power storage unit and a lithium ion storage battery 12 as a second power storage unit. From each of the storage batteries 11 and 12, power can be supplied to the starter 13, various electric loads 14 and 15, and the rotary electric machine 16. Further, each of the storage batteries 11 and 12 can be charged by the rotary electric machine 16. In this system, the lead storage battery 11 and the lithium ion storage battery 12 are connected in parallel to the rotary electric machine 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 rotary electric machine 16 corresponds to the "first electric device", and the electric load 15 corresponds to the "second electric device". The required current of the electric load 15 is smaller than the required current of the rotary electric machine 16.

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

The electric loads 14 and 15 have different requirements for the voltage of the supplied power supplied from the storage batteries 11 and 12. Among these, the electric load 15 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power fluctuates within a constant or at least a predetermined range. On the other hand, the electric load 14 is a general electric load other than the constant voltage required load. The electric load 15 can be said to be a protected load. Further, it can be said that the electric load 15 is a load to which the power failure is not allowed, and the electric load 14 is a load to which the power failure is tolerated as compared with the electric load 15.

Specific examples of the electric load 15 which is a constant voltage required load include various ECUs such as a navigation device, an audio device, a meter device, and an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, unnecessary resets and the like are suppressed 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 braking device. Specific examples of the electric load 14 include a seat heater, a heater for a defroster of a rear window, a headlight, a wiper of a front window, a blower fan of an air conditioner, and the like.

The rotary electric machine 16 is a generator with a motor function having a three-phase AC motor and a motor control unit that controls the drive of the motor, and is configured as an ISG (Integrated Starter Generator) integrated with mechanical and electrical machinery. The rotary electric machine 16 has a power generation function of generating power (regenerative power generation) by rotating the engine output shaft and the axle, and a power running function of applying a rotational force to the engine output shaft. The power running function of the rotary electric machine 16 applies rotational force to the engine when the engine that is automatically stopped is restarted during idling stop. The rotary electric machine 16 supplies the generated electric power to the storage batteries 11 and 12 and the electric loads 14 and 15.

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

The battery unit U has a first electric path L1 connecting the output terminal P1 and the lithium ion storage battery 12 as an electric path in the unit, and outputs to a connection point N1 which is an intermediate point of the first electric path L1. Terminal P2 is connected. In this case, the first electric path L1 is a path that electrically connects the lead storage battery 11 and the lithium ion storage battery 12, and the rotary electric machine 16 is connected to the connection point N1 on the first electric path L1. In the first electric path L1, the first A switch SW1A is provided on the lead storage battery 11 side of the connection point N1, and the first B switch SW1B is provided on the lithium ion storage battery 12 side of the connection point N1. The electric path between the first electric path L1 and N1-P2 is a large current path assuming that an input / output current is passed through the rotary electric machine 16, and the storage batteries 11 and 12 and the rotary electric machine 16 pass through this path. Mutual energization is performed.

Further, the battery unit U is provided with a second electric path L2 in parallel with the first electric path L1, and an output terminal P3 is connected to a connection point N2 which is an intermediate point of the second electric path L2. .. One end of the second electric path L2 is connected to a branch point N3 between the output terminal P1 and the first A switch SW1A on the first electric path L1, and the other end is connected to the first B on the first electric path L1. It is connected to the branch point N4 between the switch SW1B and the lithium ion storage battery 12. In the second electric path L2, the second A switch SW2A is provided on the lead storage battery 11 side of the connection point N2, and the second B switch SW2B is provided on the lithium ion storage battery 12 side of the connection point N2. The electric path between the second electric path L2 and N2-P3 has a small current path (that is, a permissible current as compared with the first electric path L1) assuming that a small current flows as compared with the first electric path L1 side. It is a small current path), and the electric load 15 is energized from the storage batteries 11 and 12 through this path. The connection point N1 corresponds to the "first connection point", and the connection point N2 corresponds to the "second connection point".

In the operating state of the power supply system, the first A switch SW1A and the first B switch SW1B are selectively operated in the closed state, so that at least one of the lead storage battery 11 and the lithium ion storage battery 12 is operated via the first electric path L1. Energization is performed with the rotary electric machine 16. Further, by selectively operating the second A switch SW2A and the second B switch SW2B in the closed state, at least one of the lead storage battery 11 and the lithium ion storage battery 12 and the electric load 15 are connected to each other via the second electric path L2. Energization is performed between them.

Each of the switches SW1A, SW1B, SW2A, and SW2B is configured by using a semiconductor switching element such as a MOSFET, so to speak, it is a normally open type switch. Specifically, for example, the first A switch SW1A is a switch unit 21 composed of semiconductor switching elements connected in series with the directions of the parasitic diodes reversed from each other, and a semiconductor connected in series with the directions of the parasitic diodes reversed from each other. It has a switch unit 22 composed of a switching element, and these switch units 21 and 22 are connected in parallel. Other switches have a similar configuration. That is, the first B switch SW1B is configured by connecting the switch units 23 and 24 in parallel, the second A switch SW2A is configured by connecting the switch units 25 and 26 in parallel, and the second B switch SW2B is configured. The switches 27 and 28 are connected in parallel.

Since each of the above switch units 21 to 28 has a pair of semiconductor switching elements in which the directions of the parasitic diodes are reversed from each other, for example, when the first A switch SW1A is turned off (open), that is, each semiconductor switching element. When is turned off, the flow of current through the parasitic diode is completely cut off. That is, it is possible to prevent an unintentional current from flowing in each of the electric paths L1 and L2.

In FIG. 1, the parasitic diodes are connected to each other by the anodes, but the cathodes of the parasitic diodes may be connected to each other. As the semiconductor switching element, it is also possible to use an IGBT, a bipolar transistor, or the like instead of the MOSFET. When an IGBT or a bipolar transistor is used, a diode instead of the parasitic diode may be connected to each semiconductor switching element in parallel.

Here, the configuration of the drive unit of each switch SW1A, SW1B, SW2A, SW2B will be described. FIG. 2 is a circuit diagram showing a configuration of a drive unit of the first A switch SW1A. The first A switch SW1A has switching elements 21a and 21b constituting the switch unit 21 and switching elements 22a and 22b constituting the switch unit 22. Then, drive circuits 41a and 41b are provided for each of the switching elements 21a and 21b as the power supply driving unit 41 for driving the switch unit 21, and each switching element 22a and 22b is driven as the power supply driving unit 42 for driving the switch unit 22. Circuits 42a and 42b are provided. A command signal for opening / closing operation is input from a control unit (main control unit 51 or sub control unit 52 described later) to each drive circuit 41a, 41b, 42a, 42b. Each drive circuit 41a, 41b, 42a, 42b opens or closes each switching element 21a, 21b, 22a, 22b based on a command signal. In this embodiment, in particular, the drive circuits 41a, 41b, 42a, 42b have the switching elements 21a, 21b, 22a, respectively, when an off command signal (for example, a low signal) from the control unit is input in the switch closed state. It has a delay function of releasing 22b after waiting for a predetermined delay time. For example, the delay time is about 50 msec.

The power supply voltage Vcc is individually supplied to the power supply drive units 41 and 42. According to the above configuration, since the switch units 21 and 22 parallel to each other are driven by the power supply drive units 41 and 42, respectively, even if a power supply failure occurs in one switch unit, the other switch unit can be opened and closed. It has become. Although the description by illustration is omitted, the other switches SW1B, SW2A, and SW2B have the same configuration.

Further, the battery unit U is provided with a bypass path L3 connecting the output terminal P1 and the output terminal P3, and a bypass relay 31 and a fuse 32 are provided on the bypass path L3. That is, the bypass relay 31 is provided in parallel with the second A switch SW2A. The bypass relay 31 corresponds to a "bypass switch" and is a normally closed type mechanical relay switch. By closing the bypass relay 31, the lead-acid battery 11 and the electric load 15 are electrically connected even when the second A switch SW2A is off. For example, when the power switch (ignition switch) of the vehicle is off, the switches SW1A, SW1B, SW2A, and SW2B are off (closed), and in such a state, the electric load 15 is applied to the electric load 15 via the bypass relay 31. On the other hand, dark current is supplied.

Like the second electric path L2, the bypass path L3 is a small current path having a smaller allowable current than the first electric path L1, and the fuse 32 is blown by the flow of the upper limit current of the path corresponding to the allowable current. It has become so. It is also possible to provide the bypass path L3 and the bypass relay 31 outside the battery unit U.

The battery unit U includes a main control unit 51 that controls on / off (opening / closing) of each switch SW1A, SW1B, SW2A, SW2B, and a bypass relay 31, and a sub control unit 52 that monitors the state of the main control unit 51. There is. Each of these control units 51 and 52 is composed of a microcomputer including a CPU, ROM, RAM, input / output interface, and the like, and is mounted on the same board, for example. The main control unit 51 operates the switches SW1A, SW1B, SW2A, and SW2B in the closed state in response to the energization request to the electric load 15 and the rotary electric machine 16 in the power switch on state, that is, the system operating state. The bypass relay 31 is opened. In this case, the main control unit 51 outputs an on signal (high signal) as a switch command signal when closing any of the switches SW1A, SW1B, SW2A, and SW2B, and as a switch command signal when opening. Outputs an off signal (low signal). Further, the main control unit 51 outputs an on signal (high signal) as a relay command signal when the bypass relay 31 is opened, and outputs an off signal (low signal) as a relay command signal when the bypass relay 31 is closed.

The sub control unit 52 can communicate with each other with the main control unit 51, and monitors the state of the main control unit 51 based on the communication status. That is, the sub control unit 52 determines whether or not there is an abnormality in the main control unit 51. Further, the sub control unit 52 has a function of turning on the first A switch SW1A when the main control unit 51 determines that the abnormality is abnormal. The main control unit 51 corresponds to the "switch control unit", and the sub control unit 52 corresponds to the "monitoring control unit".

An ECU 100 outside the battery unit U is connected to each of the control units 51 and 52 in the battery unit U. These control units 51 and 52 and the ECU 100 are connected by a communication network such as CAN so that they can communicate with each other, and various data stored in the control units 51 and 52 and the ECU 100 can be shared with each other. There is. The ECU 100 is a higher-level control device for each of the control units 51 and 52, and each switch for each of the control units 51 and 52 is based on the storage state of each of the storage batteries 11 and 12 and the operating state of the vehicle. It outputs commands related to open / close control of SW1A, SW1B, SW2A, SW2B and the bypass relay 31. As a result, in this power supply system, charging / discharging is carried out by selectively using the lead storage battery 11 and the lithium ion storage battery 12.

By the way, when an abnormality occurs in the main control unit 51 under the operating state of the power supply system, the main control unit 51 is reset, and the switches SW1A, SW1B, SW2A, and SW2B are turned off (opened) accordingly. In this case, there is a concern that the power supply to the electric load 15 which is the protected load may be lost due to the opening of the switch. In this regard, by closing the normally closed bypass relay 31 provided in parallel with the second A switch SW2A, the lead-acid battery 11 continues to energize the electric load 15, and the power of the electric load 15 fails. Avoided.

Further, in the present embodiment, when the sub control unit 52 determines that the main control unit 51 is abnormal, the sub control unit 52 controls the first A switch SW1A of the switches SW1A, SW1B, SW2A, and SW2B to the closed state. As a result, the lead-acid battery 11 and the rotary electric machine 16 are electrically connected to each other after an abnormality occurs in the main control unit 51, and the lead-acid battery 11 can be charged.

FIG. 3 is a flowchart showing a monitoring process of the main control unit 51 by the sub control unit 52, and this process is repeatedly performed, for example, at a predetermined cycle.

In step S11, it is determined whether or not there is an abnormality in the main control unit 51. At this time, for example, by determining a communication abnormality between the main control unit 51 and the sub control unit 52, it is determined that the abnormality occurs in the main control unit 51. If no abnormality has occurred in the main control unit 51, this process is terminated as it is.

If an abnormality has occurred in the main control unit 51, the process proceeds to step S12, and a command is given to turn on (close) the first A switch SW1A. At this time, the first A switch SW1A is not immediately turned on on the condition that step S11 is YES, but the first A switch SW1A is turned on based on the power generation request of the rotary electric machine 16 from the ECU 100. You may do so.

After that, in step S13, the ECU 100 is notified that an abnormality has occurred in the main control unit 51. The ECU 100 performs a fail-safe process such as prohibiting the power running drive of the rotary electric machine 16 based on the abnormality information of the main control unit 51.

FIG. 4 is a time chart showing measures taken when an abnormality occurs in the main control unit 51. When the system is activated, the main control unit 51 turns on and off the switches SW1A, SW1B, SW2A, and SW2B as appropriate according to the situation each time. However, for convenience, only the first A switch SW1A and the second A switch SW2A are shown here. ing.

In FIG. 4, before the timing t11, the main control unit 51 is operating normally, and for example, the switches SW1A and SW2A are closed and the bypass relay 31 is held in the open state by the command signal of the main control unit 51. There is.

Then, when an abnormality occurs in the main control unit 51 at the timing t11, the command signals from the main control unit 51 to the switches SW1A, SW2A and the bypass relay 31 are cut off. In this case, the power supply drive unit (see FIG. 2) delays the timing of opening the switches SW1A and SW2A, and the period from the output of the off command signal to the opening operation of the switches SW1A and SW2A (periods t11 to t12). Inside, the bypass relay 31 is opened. In FIG. 4, the period Ta is a delay period due to the power supply drive unit, and the period Tb is a required period (mechanical operation period) for the bypass relay 31 to shift to the closed state, and Ta> Tb. At this time, since the bypass relay 31 is closed before the second A switch SW2A is opened, the power supply from the lead storage battery 11 to the electric load 15 is continuously performed without interruption. As a result, malfunctions due to power failure at the electric load 15 are suppressed.

After that, at the timing t13, the sub control unit 52 determines that the main control unit 51 is abnormal, and the sub control unit 52 turns on (closes) the first A switch SW1A. After the timing t13, since the lead-acid battery 11 and the rotary electric machine 16 are conducted through the first electric path L1, the lead-acid battery 11 is appropriately charged by the power generation of the rotary electric machine 16.

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

When an abnormality occurs in the main control unit 51 during system operation, the normally closed bypass relay 31 provided in parallel with the second A switch SW2A is closed, so that the lead storage battery 11 is transferred to the electric load 15. It becomes possible to continue the energization of. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the electric load 15. That is, when an abnormality occurs in the main control unit 51, it is possible to suitably suppress an unintended power failure of the electric load 15. The electric load 15 is a protected load including various ECUs, and if a power failure occurs, there is a concern that the vehicle may stall due to the stop of vehicle control, but such inconvenience can be avoided.

When the main control unit 51 is determined to be abnormal, the sub control unit 52 closes the first A switch SW1A. Therefore, even after the abnormality occurs in the main control unit 51, the lead-acid battery 11 and the rotary electric machine 16 are used. Can be conducted between. As a result, the lead-acid battery 11 can be appropriately charged by the rotary electric machine 16, and the lead-acid battery 11 can be continuously used.

A main control unit 51 and a sub control unit 52 are provided in the battery unit U, and the same switch can be opened and closed by both control units 51 and 52. In this case, in the battery unit U, a redundant configuration for switch operation can be preferably realized. For example, in the battery unit U, an output terminal, a signal line, and an electric path for switch control can be realized relatively easily.

In the first A switch SW1A provided in the first electric path L1, a plurality of switch units 21 and 22 parallel to each other are configured to be driven by individual power supply drive units 41 and 42 and operated in a closed state. .. In this case, even if a power failure occurs in any of the switch portions of the first A switch SW1A, the switch portion in which the power failure has not occurred can be opened and closed. Therefore, after the occurrence of an abnormality in the main control unit 51, it is possible to reliably supply power to the lead storage battery 11 by the power generation of the rotary electric machine 16.

(Another example of the first embodiment)
-The power supply system does not have to have a configuration in which the first A switch SW1A is closed by the sub control unit 52 after an abnormality occurs in the main control unit 51. Further, the first electric device may be other than the rotary electric machine 16 having a power generation function and a power running function. For example, a generator having only a power generation function or an electric machine having only a power running function among the above two functions. May be good.

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

(Second Embodiment)
The power supply system of the second embodiment is shown in FIG. In FIG. 5, the configuration related to the bypass relay is different from that in FIG. That is, a bypass path L11 is provided between one end side and the other end side of the first A switch SW1A in the first electric path L1, and the normally closed type first bypass relay 61 and the fuse 63 are provided in the bypass path L11. And are provided. Further, in the first electric path L1, a second bypass relay 62 is provided in the bypass path L12 connecting the branch point N3 and the connection point N2 with the second electric path L2 on the lead storage battery 11 side. In the configuration of FIG. 5, a second bypass relay 62 is provided between the lead-acid battery 11 and the electric load 15 without a fuse. The first bypass relay 61 corresponds to the "first bypass switch", and the second bypass relay 62 corresponds to the "second bypass switch". The fuse 63 may be provided outside the battery unit U or inside the battery unit U.

The main control unit 51 controls the opening and closing of the switches SW1A, SW1B, SW2A, SW2B, and the bypass relays 61 and 62 in the system operating state. Further, when the sub control unit 52 determines that the main control unit 51 is abnormal, the sub control unit 52 controls the first A switch SW1A to the closed state and notifies the ECU 100 that the main control unit 51 is abnormal. The ECU 100 controls the power generation of the rotary electric machine 16 based on the abnormality information of the main control unit 51. At this time, the ECU 100 permits the power generation of the rotary electric machine 16 but limits the power generation current to a predetermined upper limit value. This upper limit value prevents the fuse 63 from being blown by the generated current flowing through the first electric path L1, and may be set according to the blown current value of the fuse 63. The rotary electric machine 16 generates electric power based on an instruction from the ECU 100. In this embodiment, the sub control unit 52 and the ECU 100 correspond to the “monitoring control unit”.

FIG. 6 is a time chart showing measures taken when an abnormality occurs in the main control unit 51. Note that FIG. 6 is a modification of the above-mentioned FIG. 4, and here, the differences from FIG. 4 will be described.

In FIG. 6, before the timing t21, the main control unit 51 is operating normally, for example, the switches SW1A and SW2A are closed, and the bypass relays 61 and 62 are held in the open state.

Then, when an abnormality occurs in the main control unit 51 at the timing t21, the command signals to the switches SW1A and SW2A and the bypass relays 61 and 62 are cut off, respectively. As a result, the bypass relays 61 and 62 are closed during the period up to the timing t22, and the switches SW1A and SW2A are subsequently opened. At this time, the power supply from the lead storage battery 11 to the electric load 15 is continuously performed without interruption.

After that, at the timing t23, the first A switch SW1A is turned on (closed) by the sub control unit 52 based on the abnormality determination of the main control unit 51. After that, at the timing t24, the ECU 100 grasps that the main control unit 51 is abnormal, and the power generation restriction by the rotary electric machine 16 is started. After the timing t24, the power running drive of the rotary electric machine 16 is prohibited.

Here, the power generation is restricted by the rotary electric machine 16 and the blow of the fuse 63 is avoided, so that the electric power is supplied from the rotary electric machine 16 to the lead storage battery 11 via the bypass path L11, and the lead storage battery 11 is continued. Use is possible. Further, in the present embodiment, since the first A switch SW1A is closed by the sub control unit 52 after the occurrence of an abnormality in the main control unit 51, in addition to the bypass path L11 between the lead storage battery 11 and the rotary electric machine 16. , The first electric path L1 is also in a conductive state. Therefore, the permissible level of the generated power supplied from the rotary electric machine 16 to the lead storage battery 11 can be increased. In this case, even if the power consumption of the electric load 15 and the other electric load 14 is large, the capacity decrease of the lead storage battery 11 can be suppressed.

When an abnormality occurs in the main control unit 51, it is conceivable that the fuse 63 is blown before the power generation restriction of the rotary electric machine 16 is enforced. However, in this case, even if the fuse 63 is blown, since the second bypass relay 62 is in the closed state, it is possible to continue energizing the electric load 15 from the lead-acid battery 11. .. Further, since the first A switch SW1A is closed by the sub control unit 52, the lead storage battery 11 can be charged by the power generation of the rotary electric machine 16.

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

If an excessive current flows through the bypass path L11 after an abnormality occurs in the main control unit 51, the fuse 63 is blown. In this case, even if the fuse 63 is blown, since the second bypass relay 62 is in the closed state, it is possible to continue energizing the electric load 15 from the lead-acid battery 11. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the electric load 15.

After an abnormality occurs in the main control unit 51, the power generation control of the rotary electric machine 16 is performed while limiting the power generation so as not to blow the fuse 63. In this case, if the fuse 63 is prevented from being blown by the power generation limitation, the electric power can be supplied from the rotary electric machine 16 to the lead storage battery 11 via the bypass path L11.

If the first A switch SW1A is closed by the sub-control unit 52 in a state where the fuse 63 is not blown, the bypass path L11 and the first electric path L1 are 2 between the lead-acid battery 11 and the rotary electric machine 16. It is possible to energize the system. In this case, the permissible level of the generated power supplied from the rotary electric machine 16 to the lead storage battery 11 can be increased, and a more suitable configuration for charging the lead storage battery 11 can be realized.

(Another example of the second embodiment)
In the configuration of FIG. 5, at least one of a process of closing the first A switch SW1A by the sub control unit 52 and a process of notifying the ECU 100 of the occurrence of the abnormality by the sub control unit 52 after the occurrence of an abnormality in the main control unit 51. It is also possible to omit. In this case, between the lead-acid battery 11 and the rotary electric machine 16, either one of the bypass path L11 and the first electric path L1 can be energized.

-In the configuration of FIG. 5, it is also possible to use a normally open type bypass switch as the first bypass relay 61. In this case, when an abnormality occurs in the main control unit 51, the first bypass relay 61 is opened, so that the fuse 63 can be avoided from being blown.

(Third Embodiment)
The power supply system of the third embodiment is shown in FIG. In FIG. 7, the configuration related to the bypass relay is different from that in FIG. That is, a bypass path L11 is provided between one end side and the other end side of the first A switch SW1A in the first electric path L1, and the normally open type first bypass relay 61 and the fuse 63 are provided in the bypass path L11. And are provided. The fuse 63 is provided on the side of the lead storage battery 11 with respect to the first bypass relay 61 in the bypass path L11. Further, a second bypass relay 62 is provided in the bypass branch path L13 that connects the intermediate point N5 between the first bypass relay 61 and the fuse 63 and the connection point N2 in the bypass path L11. The fuse 63 may be provided outside the battery unit U or inside the battery unit U.

The main control unit 51 controls the switches SW1A, SW1B, SW2A, SW2B, and the bypass relays 61 and 62 in the open state while the system is operating. In the present embodiment, since the first bypass relay 61 is a normally open type, the command signal to the first bypass relay 61 is an off signal when the system is operating. Further, when the sub control unit 52 determines that the main control unit 51 is abnormal, the sub control unit 52 controls the first A switch SW1A to the closed state and notifies the ECU 100 that the main control unit 51 is abnormal. The ECU 100 performs a fail-safe process such as prohibiting the power running drive of the rotary electric machine 16 based on the abnormality information of the main control unit 51.

FIG. 8 is a time chart showing measures taken when an abnormality occurs in the main control unit 51. Note that FIG. 8 is a modification of the above-mentioned FIG. 4, and here, the differences from FIG. 4 will be described.

In FIG. 8, before the timing t31, the main control unit 51 is operating normally, for example, the switches SW1A and SW2A are closed, and the bypass relays 61 and 62 are held in the open state.

Then, when an abnormality occurs in the main control unit 51 at the timing t31, the command signals to the switches SW1A and SW2A and the second bypass relay 62 are cut off. As a result, the second bypass relay 62 is closed in the period up to the timing t32, and subsequently, the switches SW1A and SW2A are opened. At this time, the power supply from the lead storage battery 11 to the electric load 15 is continuously performed without interruption. Since the first bypass relay 61 is a normally open type, it is maintained in an open state before and after the occurrence of an abnormality in the main control unit 51. Since the first bypass relay 61 remains in the open state, the fuse 63 is prevented from being blown due to an overcurrent.

After that, at the timing t33, the first A switch SW1A is turned on (closed) by the sub control unit 52 based on the abnormality determination of the main control unit 51. After the timing t33, the lead-acid battery 11 and the rotary electric machine 16 are electrically connected to each other through the first electric path L1, so that the lead-acid battery 11 is appropriately charged by the power generation of the rotary electric machine 16.

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

After an abnormality occurs in the main control unit 51, the normally open type first bypass relay 61 is opened, so that the fuse 63 can be avoided from being blown. Further, when the second bypass relay 62 is closed, the electric load 15 can be continuously energized from the lead storage battery 11. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the electric load 15.

In this embodiment, in particular, the bypass path L11 connecting one end side and the other end side of the first A switch SW1A is branched in two directions, that is, in the first electric path L1, on the lead storage battery 11 side of the first A switch SW1A. One end side is connected to a connection point N1 (a connection point with the rotary electric machine 16 in the first electric path L1) and a connection point N2 (a connection point with the electric load 15 in the second electric path L2), respectively. Further, in the bypass path L11, a fuse 63 is provided in a path portion before branching extending from one end side of the first A switch SW1A (in the bypass path L11, the lead storage battery 11 side of the intermediate point N5). In such a case, when an abnormality occurs in the main control unit 51, the lead storage battery 11 and the electric load 15 are connected by a path passing through the fuse 63. Therefore, if the fuse 63 is blown, the electric load 15 may not be energized. Since the fuse 63 is prevented from being blown as described above, the electric load 15 can be continuously energized.

When the main control unit 51 is determined to be abnormal, the sub control unit 52 closes the first A switch SW1A. Therefore, even after the abnormality occurs in the main control unit 51, the lead-acid battery 11 and the rotary electric machine 16 are used. Can be conducted between. As a result, the lead-acid battery 11 can be appropriately charged by the rotary electric machine 16, and the lead-acid battery 11 can be continuously used.

(Another example of the third embodiment)
-In FIG. 7, it is also possible to use a latch type bypass relay instead of the normally open type first bypass relay 61. In this case, if the command signal for closing the first bypass relay 61 is not output after the occurrence of the abnormality of the main control unit 51, the first bypass relay 61 is held in the open state.

(Fourth Embodiment)
The configuration of this embodiment is basically the same as that of FIG. 7 described in the third embodiment, except that the first bypass relay 61 provided in the bypass path L11 is a normally closed type.

The main control unit 51 controls the switches SW1A, SW1B, SW2A, SW2B, and the bypass relays 61 and 62 in the open state while the system is operating. Further, when the main control unit 51 determines that the main control unit 51 is abnormal, the sub control unit 52 controls the first bypass relay 61 to the open state, controls the first A switch SW1A to the closed state, and further controls the main. Notify the ECU 100 that the unit 51 is abnormal. The ECU 100 performs a fail-safe process such as prohibiting the power running drive of the rotary electric machine 16 based on the abnormality information of the main control unit 51.

Further, in the present embodiment, when the first bypass relay 61 shifts from the open state to the closed state by the relay command signal, the state shift of the first bypass relay 61 is delayed. Specifically, as shown in FIG. 9, a relay drive unit 71 is provided between the main control unit 51 and the first bypass relay 61, and the relay drive unit 71 corresponds to a “delay unit”. .. For example, the time required for the abnormality determination by the sub control unit 52 is assumed, and the time longer than the estimated time is set as the delay time of the relay drive unit 71. The delay time is, for example, 150 msec.

FIG. 10 is a flowchart showing a monitoring process of the main control unit 51 by the sub control unit 52, and this process is repeatedly performed, for example, at a predetermined cycle. This process is a modification of a part of the process of FIG. 3 described above, and is specifically different only in that step S21 is added.

In FIG. 10, when it is determined that an abnormality has occurred in the main control unit 51 (YES in step S11), in step S21, a command is given to open the first bypass relay 61. After that, the closing command of the first A switch SW1A and the notification to the ECU 100 are executed (steps S12 and S13).

FIG. 11 is a time chart showing measures taken when an abnormality occurs in the main control unit 51. Note that FIG. 11 is a modification of the above-mentioned FIG. 4, and here, the differences from FIG. 4 will be described.

In FIG. 11, before the timing t41, the main control unit 51 is operating normally, for example, the switches SW1A and SW2A are closed, and the bypass relays 61 and 62 are held in the open state.

Then, when an abnormality occurs in the main control unit 51 at the timing t41, the command signals to the switches SW1A and SW2A and the bypass relays 61 and 62 are cut off, respectively. As a result, the second bypass relay 62 is closed during the period up to the timing t42, and subsequently, the switches SW1A and SW2A are opened. At this time, the power supply from the lead storage battery 11 to the electric load 15 is continuously performed without interruption.

Further, in the present embodiment, when the first bypass relay 61 shifts from the open state to the closed state by the relay command signal from the main control unit 51, the state transition is delayed, for example, the period Tc is set. The delay period. In this case, the delay period Tc is a period from the occurrence of an abnormality in the main control unit 51 to the opening of the first bypass relay 61 by the sub control unit 52. As a result, the first bypass relay 61 is maintained in an open state before and after the occurrence of an abnormality in the main control unit 51. Since the first bypass relay 61 remains in the open state, the fuse 63 is prevented from being blown due to an overcurrent.

After that, at the timing t43, the first A switch SW1A is turned on (closed) by the sub control unit 52 based on the abnormality determination of the main control unit 51. After the timing t43, the lead-acid battery 11 and the rotary electric machine 16 are electrically connected to each other through the first electric path L1, so that the lead-acid battery 11 is appropriately charged by the power generation of the rotary electric machine 16.

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

After the abnormality occurs in the main control unit 51, the first bypass relay 61 is opened by the sub control unit 52, so that the fuse 63 can be avoided from being blown. Further, when the second bypass relay 62 is closed, the electric load 15 can be continuously energized from the lead storage battery 11. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the electric load 15.

In this embodiment, in particular, the bypass path L11 connecting one end side and the other end side of the first A switch SW1A is branched in two directions, that is, in the first electric path L1, on the lead storage battery 11 side of the first A switch SW1A. One end side is connected to a connection point N1 (a connection point with the rotary electric machine 16 in the first electric path L1) and a connection point N2 (a connection point with the electric load 15 in the second electric path L2), respectively. Further, in the bypass path L11, a fuse 63 is provided in a path portion before branching extending from one end side of the first A switch SW1A (in the bypass path L11, the lead storage battery 11 side of the intermediate point N5). In such a case, when an abnormality occurs in the main control unit 51, the lead storage battery 11 and the electric load 15 are connected by a path passing through the fuse 63. Therefore, if the fuse 63 is blown, the electric load 15 may not be energized. Since the fuse 63 is prevented from being blown as described above, the electric load 15 can be continuously energized.

When an abnormality occurs in the main control unit 51, the first bypass relay 61 is closed by stopping the open command from the main control unit 51 before the sub control unit 52 controls the first bypass relay 61 to the open state. Then, the fuse 63 may be blown due to excessive energization of the fuse 63. In this regard, a configuration is provided to delay the state transition of the first bypass relay 61 so that the state transition of the first bypass relay 61 is delayed until after the sub-control unit 52 opens the first bypass relay 61. As a result, the fuse 63 is prevented from being blown, and the electric load 15 can be continuously energized.

When the main control unit 51 is determined to be abnormal, the sub control unit 52 closes the first A switch SW1A. Therefore, even after the abnormality occurs in the main control unit 51, the lead-acid battery 11 and the rotary electric machine 16 are used. Can be conducted between. As a result, the lead-acid battery 11 can be appropriately charged by the rotary electric machine 16, and the lead-acid battery 11 can be continuously used.

(Another example of the fourth embodiment)
-The first bypass relay 61 may be always open by the relay command signal from the sub control unit 52 when the system is operating. In this case, the first bypass relay 61 is maintained in an open state before and after the occurrence of an abnormality in the main control unit 51. Since the first bypass relay 61 remains in the open state, the fuse 63 is prevented from being blown due to an overcurrent.

(Fifth Embodiment)
The power supply system of the fifth embodiment is shown in FIG. In FIG. 12, the configuration related to the bypass relay is different from that in FIG. That is, in the first electric path L1, a bypass path L11 (first bypass path) is provided between one end side and the other end side of the first A switch SW1A, and the bypass path L11 is a normally closed type first. A bypass relay 61 and a fuse 63 are provided. Further, a second bypass relay 65 is provided in the bypass path L14 (second bypass path) connecting the connection point N1 and the connection point N2. In this configuration, the first bypass relay 61 and the second bypass relay 62 are provided in series between the lead-acid battery 11 and the electric load 15. The first bypass relay 61 corresponds to the "first bypass switch", and the second bypass relay 65 corresponds to the "second bypass switch". The fuse 63 may be provided outside the battery unit U or inside the battery unit U.

The main control unit 51 controls the opening and closing of the switches SW1A, SW1B, SW2A, SW2B, and the bypass relays 61 and 65 in the system operating state. Further, when the main control unit 51 determines that the main control unit 51 is abnormal, the sub control unit 52 controls the first A switch SW1A and the second A switch SW2A to the closed state, and controls the second bypass relay 65 to the open state. Further, the main control unit 51 notifies the ECU 100 that the abnormality is present. The ECU 100 performs a fail-safe process such as prohibiting the power running drive of the rotary electric machine 16 based on the abnormality information of the main control unit 51.

Further, in the present embodiment, when a signal for shifting the switches SW1A and SW2A from the closed state to the open state is output from the main control unit 51, the state transition of the switches SW1A and SW2A is delayed. Specifically, as shown in FIG. 13, switch drive units 81 and 82 are provided between the main control unit 51 and the switches SW1A and SW2A, and the switch drive units 81 and 82 are "delay units". Corresponds to. For example, the time required for the abnormality determination by the sub control unit 52 is assumed, and the time longer than the estimated time is set as the delay time of the switch drive units 81 and 82. The delay time is, for example, 150 msec. The switch drive units 81 and 82 correspond to the power supply drive units 41 and 42 shown in FIG. 2 for each drive unit.

FIG. 14 is a time chart showing measures taken when an abnormality occurs in the main control unit 51. Note that FIG. 14 is a modification of the above-mentioned FIG. 4, and here, the differences from FIG. 4 will be described.

In FIG. 14, before the timing t51, the main control unit 51 is operating normally, for example, the switches SW1A and SW2A are closed, and the bypass relays 61 and 65 are held in the open state.

Then, when an abnormality occurs in the main control unit 51 at the timing t51, the command signals to the switches SW1A and SW2A and the bypass relays 61 and 65 are cut off, respectively. At this time, the state transition of each switch SW1A and SW2A is delayed, for example, the period Td is the delay period. After that, at timing t52, the bypass relays 61 and 65 are closed.

After that, at the timing t53, the sub-control unit 52 outputs the ON command signals of the first A switch SW1A and the second A switch SW2A based on the abnormality determination of the main control unit 51. In this case, the delay period Td of the state transition of the switches SW1A and SW2A is a period from the occurrence of an abnormality in the main control unit 51 to the closing of the switches SW1A and SW2A by the sub control unit 52. As a result, the switches SW1A and SW2A are maintained in the closed state before and after the occurrence of the abnormality of the main control unit 51. Since the second A switch SW2A remains in the closed state, the power supply from the lead storage battery 11 to the electric load 15 is continuously performed without interruption.

After the timing t53, the first A switch SW1A is in the closed state, and the lead-acid battery 11 and the rotary electric machine 16 are conducted through the first electric path L1. Therefore, the lead-acid battery 11 is appropriately charged by the power generation of the rotary electric machine 16. Will be done.

It is also conceivable that the fuse 63 is not blown after the timing t53. Assuming such a situation, the ECU 100 may be configured to command the power generation control of the rotary electric machine 16 so that the fuse 63 is not blown.

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

In a configuration in which the lead-acid battery 11 and the electric load 15 are connected via bypass paths L11 and L14 as the switches SW1A, SW1B, SW2A, and SW2B are opened when an abnormality occurs in the main control unit 51, the main control unit 51 After the occurrence of the abnormality, the sub-control unit 52 controls the second A switch SW2A to the closed state. In this case, even if the fuse 63 on the bypass path L11 is blown, it is possible to continue energizing the electric load 15 from the lead-acid battery 11. As a result, it is possible to avoid the inconvenience caused by unintentionally interrupting the energization of the electric load 15.

When an abnormality occurs in the main control unit 51, the second A switch SW2A is opened by stopping the closing command from the main control unit 51 before the second A switch SW2A is controlled to the closed state by the sub control unit 52. There is a risk of power failure at the electrical load 15. In this regard, in the above configuration, a configuration for delaying the state transition of the second A switch SW2A is provided so that the state transition of the second A switch SW2A is delayed until after the second A switch SW2A is closed by the sub control unit 52. As a result, the power failure in the electric load 15 can be avoided, and the electric load 15 can be properly energized.

If the sub-control unit 52 does not control the closing of the second A switch SW2A, if the fuse 63 is blown due to energization while the bypass relays 61 and 65 are closed, the electric load 15 will be charged. Although there is a concern that the power supply may be lost, such inconvenience can be avoided according to the present embodiment.

When the main control unit 51 is determined to be abnormal, the sub control unit 52 closes the first A switch SW1A and the second A switch SW2A. Therefore, even after the abnormality occurs in the main control unit 51, the lead-acid battery 11 And the rotary electric machine 16 can be made conductive. As a result, the lead-acid battery 11 can be appropriately charged by the rotary electric machine 16, and the lead-acid battery 11 can be continuously used.

(Another example of the fifth embodiment)
-The second bypass relay 65 may be always open by the relay command signal from the sub control unit 52 when the system is operating.

(Other embodiments)
The above embodiment may be changed as follows, for example.

-In each of the above embodiments, the state of the main control unit 51 may be monitored by the ECU 100. In this case, the ECU 100 determines whether or not the main control unit 51 is abnormal based on the communication status with the main control unit 51 and the like. Further, the first A switch SW1A is closed by the command signal of the ECU 100, and when an abnormality occurs in the main control unit 51, the ECU 100 outputs a command signal to close the first A switch SW1A. In this configuration, the ECU 100 corresponds to the "monitoring control unit".

In the configuration in which the state of the main control unit 51 is monitored by the ECU 100, in addition to the above, when the main control unit 51 is determined to be abnormal in the fourth embodiment (FIG. 7), the first bypass relay 61 is opened. It is good to control to. Further, in the fifth embodiment (FIG. 12), when the main control unit 51 determines to be abnormal, the first A switch SW1A and the second A switch SW2A are controlled to be in the closed state, and the second bypass relay 65 is opened. It is good to control the state.

-In the battery unit U, the main control unit 51 and the sub control unit 52 may be configured outside the unit. Further, the present invention is not limited to the one realized by including the battery unit U. That is, it may be realized by a configuration other than the configuration in which the lithium ion storage battery 12 and each switch are integrally packed.

-The power supply system is not limited to the one including the lead storage battery 11 and the lithium ion storage battery 12 as the first storage battery and the second storage battery. For example, instead of either the lead storage battery 11 or the lithium ion storage battery 12, another secondary battery such as a nickel hydrogen storage battery may be used. Further, both the first storage battery and the second storage battery can be a lead storage battery or a lithium ion storage battery. It is also possible to use three or more storage batteries in the power supply system.

-The present invention is not limited to the in-vehicle power supply device, and the present invention can be applied to a power supply device other than the in-vehicle power supply device.

10 ... Lead storage battery (first storage battery), 12 ... Lithium ion storage battery (second storage battery), 15 ... Electric load (first electric device), 16 ... Rotating electric machine (second electric device), 31 ... Bypass relay, 51 ... Main control unit (switch control unit), L1 ... 1st electric path, L2 ... 2nd electric path, SW1A ... 1st A switch, SW1B ... 1st B switch, SW2A ... 2nd A switch, SW2B ... 2nd BA switch.

Claims (3)

A first storage battery (11) and a second storage battery (12) connected in parallel to the first electric path (L1) are provided, and a first electric device (16) is connected to the first electric path, and both storage batteries are connected. In a power supply system in which a second electric device (15) is connected to a second electric path (L2) provided in parallel with the first electric path between the two, and the first electric device is a generator having a power generation function. There,
A first A switch (SW1A) provided on the side of the first storage battery with respect to the first connection point (N1) with the first electric device in a portion of the first electric path parallel to the second electric path. ,
A first B switch (SW1B) provided on the side of the second storage battery with respect to the first connection point in a portion of the first electric path parallel to the second electric path.
A second A switch (SW2A) provided on the side of the first storage battery with respect to the second connection point (N2) with the second electric device in the second electric path.
A second B switch (SW2B) provided on the side of the second storage battery with respect to the second connection point in the second electric path, and
A normally closed type first bypass switch (61) provided in a bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path and becomes a conductive state when the system is stopped. ,
A fuse (63) provided in the bypass path and
A normally closed type that is provided in a bypass path (L12) that connects a branch point (N3) with the second electric path and the second connection point in the first electric path, and is in a conductive state when the system is stopped. The second bypass switch (62) and
In the system operating state, the first A, the first B, the second A, and the second B switch are operated in the closed state in response to the energization request to the first electric device and the second electric device, and the first A switch control unit (51) that opens the 1 bypass switch and the 2nd bypass switch, and
Wherein monitoring the state of the switch control unit, the monitoring control unit to determine whether an abnormal state in which the switch control is impossible due to the switch control section (52,100),
With
When the switch control unit determines that the switch control unit is abnormal, the monitoring control unit controls the first A switch to a closed state, and under that state, limits power generation so as not to blow the fuse. A power supply system that controls the power generation of a generator. The first A switch has a plurality of switch portions (21, 22) provided in parallel with each other.
Power supply drive units (41, 42) are individually provided for each of the plurality of switch units.
The power supply system according to claim 1, wherein the plurality of switch units are operated in a closed state by a command signal input for each power supply drive unit. A first storage battery (11) and a second storage battery (12) connected in parallel to the first electric path (L1) are provided, and a first electric device (16) is connected to the first electric path, and both storage batteries are connected. In a power supply system in which a second electric device (15) is connected to a second electric path (L2) provided in parallel with the first electric path between the two , and the first electric device is a generator having a power generation function. There,
A first A switch (SW1A) provided on the side of the first storage battery with respect to the first connection point (N1) with the first electric device in a portion of the first electric path parallel to the second electric path. ,
A first B switch (SW1B) provided on the side of the second storage battery with respect to the first connection point in a portion of the first electric path parallel to the second electric path.
A second A switch (SW2A) provided on the side of the first storage battery with respect to the second connection point (N2) with the second electric device in the second electric path.
A second B switch (SW2B) provided on the side of the second storage battery with respect to the second connection point in the second electric path, and
A normally closed type first bypass switch (61) provided in the first bypass path (L11) connecting one end side and the other end side of the first A switch in the first electric path and becomes a conductive state when the system is stopped. )When,
A normally closed type second bypass switch (65) provided in the second bypass path (L14) connecting the first connection point and the second connection point and is in a conductive state when the system is stopped.
A fuse (63) provided in the first bypass path and
In the system operating state, the first A, the first B, the second A, and the second B switch are operated in the closed state in response to the energization request to the first electric device and the second electric device, and the first 1, the switch control unit (51) that opens the second bypass switch, and
As monitoring of the state of the switch control unit, it is determined whether or not the switch control unit cannot control the switch , and when it is determined that the switch control unit is abnormal, the first A. A monitoring control unit (52,100) that controls the switch and the second A switch in the closed state, and
When the switch control unit outputs a signal to shift the first A switch and the second A switch from the closed state to the open state, the delay section (81, 82) that delays the state transition of each of these switches. And with
The delay unit is a power supply system that delays the state transition of each of the first A switch and the second A switch until after the monitoring and control unit closes the first A switch and the second A switch.

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