WO2024018614A1

WO2024018614A1 - Vehicle-mounted control device

Info

Publication number: WO2024018614A1
Application number: PCT/JP2022/028453
Authority: WO
Inventors: 佳佑若園; 一輝増田
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2024-01-25

Abstract

This vehicle-mounted control device (60) is used in an in-vehicle system (100) and controls a charging operation performed by a charging unit (20) and a discharging operation performed by a discharging unit (30). The vehicle-mounted control device (60) comprises a control unit (61) that controls the charging unit (20) and the discharging unit (30). The control unit (61) is able to execute a first control that, while causing the charging unit (20) to perform the charging operation, causes the discharging unit (30) to perform the discharging operation, and a second control that, without causing the charging unit (20) to perform the charging operation, causes the discharging unit (30) to perform the discharging operation. The control unit (61) executes the first control when the voltage in a power path (80) satisfies a voltage condition of being at most a failure determination voltage and does not satisfy a failure determination condition that is different from the voltage condition.

Description

Automotive control device

The present disclosure relates to a vehicle-mounted control device.

Patent Document 1 discloses a power supply device having a backup function. This power supply device supplies power to the load circuit using power provided from the AC-DC conversion power supply when the power supply unit (AC power supply) is in operation, and when the power supply unit (AC power supply) is stopped. In this case, the power stored in the power storage unit (battery) is used to supply power to the load circuit.

JP2011-24288A

In an in-vehicle system that supplies power from a power source to a load in a vehicle, it is desirable to immediately supply power from a power storage unit different from the power source when the power supply fails and the power supply from the power source stops. To this end, it is desirable to supply power from the power storage unit as soon as possible when the possibility of power failure increases. However, if you adopt a method of supplying power from the power storage unit early before a power failure is confirmed, the risk of power supply to the load being cut off in the event of a power failure can be reduced; The amount of discharge from the storage unit tends to increase, and the amount of charge in the power storage unit tends to decrease.

The present disclosure provides a technology that makes it easy to quickly supply power to a load in the event of a power failure, and that makes it easy to suppress a decrease in the degree of charging of a power storage unit.

An in-vehicle control device that is one aspect of the present disclosure includes:
a power supply section, a power storage section different from the power supply section, a power path that is a path for supplying power from the power supply section to a load, and supplying current to the power storage section based on the power supplied from the power supply section. It is used in an in-vehicle system comprising a charging unit that performs a charging operation, and a discharging unit that performs a discharging operation that causes current to flow to the load side based on the power supplied from the power storage unit, and the charging unit performs the charging operation and An on-vehicle control device that controls the discharge operation by the discharge section,
comprising a control unit that controls the charging unit and the discharging unit,
The control section includes a first control that causes the discharging section to perform the discharging operation while causing the charging section to perform the charging operation, and a first control that causes the discharging section to perform the discharging operation without causing the charging section to perform the charging operation. and a second control to perform the first control when the voltage of the power path satisfies a voltage condition that is equal to or less than a failure determination voltage and does not satisfy a failure determination condition different from the voltage condition. Execute control.

The technology according to the present disclosure makes it easy to quickly supply power to a load in the event of a power failure, and to suppress a decrease in the degree of charging of the power storage unit.

FIG. 1 is a configuration diagram schematically showing an in-vehicle system including an in-vehicle control device according to a first embodiment. FIG. 2 is a flowchart illustrating the flow of backup support control performed by the in-vehicle control device according to the first embodiment. FIG. 3 is an explanatory diagram conceptually explaining how power is supplied from the power supply unit to the load in a state where the charging operation and the discharging operation are stopped. FIG. 4 is an explanatory diagram conceptually explaining how power is supplied from the power supply unit to the load in the charging operation state. FIG. 5 is an explanatory diagram conceptually explaining how a charging operation and a discharging operation are performed in a state where power supply from the power supply section via the first switch section is stopped. FIG. 6 is an explanatory diagram conceptually explaining how a discharging operation is performed in a state where the power supply from the power supply unit via the first switch unit and the charging operation are stopped.

[Description of embodiments of the present disclosure]
In the following, embodiments of the disclosure are listed and illustrated.

[1] A power supply unit, a power storage unit different from the power supply unit, a power path that is a path for supplying power from the power supply unit to a load, and a current flow to the power storage unit based on the power supplied from the power supply unit. and a discharging unit that performs a discharging operation that causes current to flow to the load side based on the electric power supplied from the power storage unit. An on-vehicle control device that controls a charging operation and the discharging operation by the discharging section,
comprising a control unit that controls the charging unit and the discharging unit,
The control section includes a first control that causes the discharging section to perform the discharging operation while causing the charging section to perform the charging operation, and a first control that causes the discharging section to perform the discharging operation without causing the charging section to perform the charging operation. and a second control to perform the first control when the voltage of the power path satisfies a voltage condition that is equal to or less than a failure determination voltage and does not satisfy a failure determination condition different from the voltage condition. An in-vehicle control device that performs control.

The in-vehicle control device described in [1] discharges the power storage unit and supplies power to the load early even if the failure determination condition is not satisfied when the voltage of the power path is equal to or lower than the failure determination voltage. be able to. Therefore, this in-vehicle control device can suppress the risk of interruption of power supply to the load in the event of a power failure. On the other hand, if the voltage of the power path is below the failure determination voltage, the charging unit can continue charging unless the failure determination conditions are met, so even if the power storage unit is not discharged due to noise etc. Even if the amount increases, it is possible to suppress a decrease in the degree of charging of the power storage unit.

[2] The failure determination condition includes that the voltage of the power path is equal to or lower than the failure determination voltage for a certain period of time,
The vehicle-mounted control device according to [1], wherein the control unit executes the second control when the time during which the voltage of the power path is equal to or lower than the failure determination voltage continues for the certain period of time.

The in-vehicle control device described in [2] can continue the charging operation by the charging unit if the failure determination condition is not satisfied when the voltage of the power line is below the failure determination voltage. Even if the discharge of the power storage unit increases due to this, a decrease in the degree of charge of the power storage unit can be suppressed. On the other hand, the in-vehicle control device executes the second control when the voltage of the power line continues to be below the failure determination voltage for a certain period of time, that is, when the possibility of power failure increases further. However, by stopping the charging operation, it is possible to suppress the influence caused by the state of the power path from reaching the power storage unit side due to the charging operation.

[3] The in-vehicle system includes a switch section provided in the power path,
The charging unit supplies current to the power storage unit based on power supplied from a first power path closer to the power supply unit than the switch unit in the power path,
The discharging unit performs the discharging operation so as to cause a current to flow in a second power path on the load side of the power path rather than the switch unit,
When the switch section is in an on state, bidirectional energization is allowed between the first power path and the second power path, and when the switch section is in an off state, at least the second power path to the first power path is allowed to flow between the first power path and the second power path. Power is cut off to
After the voltage condition is met, the control section keeps the switch section in the OFF state until a certain period of time during which the power path is below the failure determination voltage has elapsed, and after the voltage condition is met, The switch section is brought into the on state on the condition that the voltage of the power path exceeds the failure determination voltage before the predetermined period of time during which the power path is lower than or equal to the failure determination voltage elapses; The in-vehicle device according to [2], wherein after the condition is met, if the predetermined period of time has elapsed during which the power path is below the failure determination voltage, the charging operation is stopped while the switch section is turned off. control device.

The in-vehicle control device described in [3] keeps the switch part in the OFF state until the time when the voltage of the power line is below the failure judgment voltage has elapsed for a certain period of time when the voltage of the power line becomes below the failure judgment voltage. Current can be prevented from flowing from the second power path to the first power path. Therefore, if the voltage of the power path is lower than the failure determination voltage due to a power failure, the discharge current is supplied to the load from the power storage unit and the discharge current is not diverted to the first power path. It can be shut off reliably. On the other hand, the in-vehicle control device operates the switch on the condition that after the voltage condition is met, the power path exceeds the failure determination voltage again before a certain period of time has elapsed. By switching the unit to the on state, the power supply unit can return to supplying power to the load. Therefore, even if the voltage of the power path temporarily drops below the failure determination voltage due to noise or the like, normal operation can be quickly restored if the voltage returns quickly. Even if the discharging operation based on such a temporary voltage drop is repeated, since the charging operation is likely to be performed each time, a decrease in the degree of charging of the power storage unit can be suppressed. Furthermore, this in-vehicle control device turns off the switch section and stops the charging operation when the power path is below the failure determination voltage for a certain period of time after the voltage condition is satisfied. If the possibility of a power failure increases further, the discharge current based on the power storage unit can be supplied to the load while suppressing the influence caused by the state of the first power path from reaching the second power path. .

[4] The failure determination condition includes that a current flows from the charging unit side to the power path side,
The in-vehicle control device according to [1], wherein the control unit executes the second control when a current flows from the charging unit side to the power path side.

The in-vehicle control device described in [4] can continue the charging operation by the charging unit if the failure determination condition is not satisfied when the voltage of the power path is below the failure determination voltage. Even if the discharge of the power storage unit increases due to this, a decrease in the degree of charge of the power storage unit can be suppressed. On the other hand, the above-mentioned in-vehicle control device executes the second control when current flows from the charging unit side to the power path side and stops the charging operation, so that the influence caused by the state of the power path is suppressed from the charging operation. This can prevent the energy from reaching the power storage unit. For example, if a ground fault occurs in a power line and the voltage of the power line falls below the fault determination voltage due to the ground fault, there is a risk that a large current will flow into the ground fault location if charging continues. If the second control is executed when the current flows from the charging unit side to the power path side, such a problem is unlikely to occur.

[5] The in-vehicle system includes a switch section provided in the power path,
The charging unit supplies current to the power storage unit based on power supplied from a first power path closer to the power supply unit than the switch unit in the power path,
The discharging unit performs the discharging operation so as to cause a current to flow through a second power path on the load side of the power path rather than the switch unit,
When the switch section is in an on state, current is allowed to flow between the first power path and the second power path in both directions, and when the switch section is in an off state, at least the second power path to the first power path is allowed to flow between the first power path and the second power path. Power is cut off to
The control unit executes the first control on the condition that the voltage condition is satisfied and no current flows from the charging unit side to the power path side, and the control unit executes the first control on the condition that the voltage condition is satisfied and no current flows from the charging unit side to the power path side. The in-vehicle control device according to [4], wherein the second control is executed while turning off the switch section when a current flows through the switch section.

The in-vehicle control device described in [5] executes the first control on the condition that no current flows from the charging unit side to the power path side when the voltage of the power path becomes equal to or lower than the failure determination voltage. Therefore, when the voltage of the power path becomes equal to or lower than the failure determination voltage, the charging operation can be performed after confirming that the possibility of a ground fault is low. On the other hand, if the voltage of the power path falls below the failure judgment voltage and current flows from the live part side to the power path side, that is, if there is a high possibility of a ground fault, the switch part is turned off. By executing the second control, it is possible to supply the discharge current based on the power storage unit to the load while preventing current from flowing from the second power path to the first power path.

[6] The failure determination condition includes that the voltage of the power path has become equal to or lower than a reference voltage that is smaller than the failure determination voltage,
The in-vehicle control device according to [1], wherein the control unit executes the second control when the voltage becomes equal to or lower than the reference voltage.

The in-vehicle control device described in [6] can cause the charging unit to continue the charging operation if the failure determination condition is not satisfied when the voltage of the power path is below the failure determination voltage. Even if the discharge of the power storage unit increases due to this, a decrease in the degree of charge of the power storage unit can be suppressed. On the other hand, the above-mentioned in-vehicle control device can stop the charging operation and perform the discharging operation when the voltage of the power path falls below the reference voltage, which is smaller than the failure judgment voltage, so it is possible to prevent the possibility of power failure. If the performance is higher, it is possible to suppress the influence caused by the state of the power path from reaching the power storage unit side due to the charging operation.

<First embodiment>
1. Overview of In-Vehicle System In FIG. 1, an in-vehicle system 100 is shown. The in-vehicle system 100 in FIG. 1 mainly includes an in-vehicle power supply system 3 and a load 11. The on-vehicle power supply system 3 is also referred to as a power supply system 3 in the following description. The in-vehicle system 100 is a system in which the power supply system 3 supplies power to the load 11 to operate the load 11. In FIG. 1, a load 11 is illustrated as an example of an in-vehicle load, but the in-vehicle system 100 may be provided with other loads.

The load 11 is an electrical component mounted on the vehicle. The load 11 operates by receiving power supplied via the power path 80. The type of load 11 is not limited. As the load 11, various known in-vehicle components may be adopted. Load 11 may include multiple electrical components or may be a single electrical component. The load 11 is a load that is required to operate even when the power supply from the power supply unit 10 to itself is cut off. For example, the load 11 is a load that performs operations necessary for stopping the vehicle (shift-by-wire control). system, electronically controlled brake system, etc.).

The power supply system 3 is a system that supplies power to the load 11. Power supply system 3 supplies power to load 11 using power supply unit 10 or power storage unit 13 as a power supply source. The power supply system 3 can supply power from the power supply unit 10 to the load 11. For example, when the power supply from the power supply unit 10 is interrupted due to a failure or the like, power is supplied from the power storage unit 13 to the load 11. be able to.

2. Outline of power supply system The power supply system 3 includes a power supply section 10, a power storage section 13, a charging section 20, a discharging section 30, an on-vehicle control device 60, a power path 80, a first switch section 12, a first voltage detection section 51, a second It includes a voltage detection section 52, a third voltage detection section 53,

conductive paths

83 and 84, and the like.

The power supply unit 10 is an on-vehicle power supply that supplies power to the load 11, and functions as a main power supply that supplies power to the load 11. The power supply unit 10 is configured as, for example, a known vehicle battery such as a lead battery. The power supply section 10 may be configured with a battery other than a lead battery, and may have a power source means other than the battery instead of or in addition to the battery. The positive electrode of the power supply section 10 is electrically connected to the first power path 81, which is a part of the power path 80, for example, in a configuration in which it is short-circuited to the first power path 81. The negative electrode of the power supply unit 10 is electrically connected to the ground, for example, in a short-circuited configuration. The power supply unit 10 applies a constant DC voltage to the first power path 81 . The voltage that the power supply section 10 applies to the first power path 81 may vary somewhat from the above-mentioned constant value.

The power storage unit 13 is a power source different from the power source unit 10. The power storage unit 13 is a power supply that serves as a power supply source at least when the power supply from the power supply unit 10 is interrupted, and is a backup power supply that supplies power to the load 11 when the power supply from the power supply unit 10 is insufficient. functions as The power storage unit 13 is configured by, for example, a known power storage means such as an electric double layer capacitor (EDLC). The power storage unit 13 may be configured with a capacitor other than the electric double layer capacitor, and may include other power storage means (such as a battery) instead of or in addition to the capacitor. The positive electrode of power storage unit 13 is electrically connected to conductive path 83 in a short-circuited configuration. The negative electrode of power storage unit 13 is electrically connected to the ground in a short-circuited configuration. The output voltage of the power storage unit 13 (the voltage applied to the conductive path 83 by the power storage unit 13) may be higher than the output voltage of the power supply unit 10 (the voltage applied to the first power path 81 by the power supply unit 10). , may be small.

In this specification, unless otherwise specified, voltage is a voltage relative to a ground potential (for example, 0 V), and is a potential difference from the ground potential. For example, the voltage applied to the first power path 81 is the potential difference between the potential of the first power path 81 and the ground potential. The voltage applied to the conductive path 83 is the potential difference between the potential of the conductive path 83 and the ground potential.

The power path 80 is a path through which power is transmitted from the power supply section 10, and is a path through which power is supplied from the power supply section 10 to the load 11. In the example of FIG. 1, the power path 80 includes a first power path 81 provided closer to the power supply section 10 than the first switch section 12, and a second power path 82 provided closer to the load 11 than the first switch section 12. and has. The first power path 81 is a power path closer to the power supply section 10 than the first switch section 12 (switch section) in the power path 80 . The same or substantially the same voltage as the output voltage of the power supply unit 10 is applied to the first power path 81 . One end of the first power path 81 is short-circuited to the positive electrode of the power supply unit 10 and is electrically connected to the positive electrode. The other end of the first power path 81 is electrically connected to one end of the first switch section 12 . The first power path 81 may be provided with a relay or a fuse. The second power path 82 is a power path closer to the load 11 than the first switch section 12 (switch section) in the power path 80 . One end of the second power path 82 is electrically connected to the other end of the first switch section 12 . In the example of FIG. 1, the second power path 82 is short-circuited to one end of the load 11.

The first switch section 12 is composed of, for example, one or more FETs (Field Effect Transistors). The first switch section 12 corresponds to an example of a "switch section". The first switch section 12 is provided in the power path 80. The first switch section 12 may be configured by FETs arranged in opposite directions, or may be configured by another semiconductor switch that bidirectionally interrupts current flow. In this case, the first switch unit 12 allows bidirectional conduction between the first power path 81 and the second power path 82 when the first switch unit 12 is in the on state, and allows energization between the first power path 81 and the second power path 82 when the first switch unit 12 is in the off state. Energization between the second power path 82 is interrupted in both directions. The first switch section 12 may be configured by a single FET having a parasitic diode whose anode is connected to the first power path 81 and whose cathode is connected to the second power path 82 . In this case, the first switch section 12 allows bidirectional conduction of electricity between the first power path 81 and the second power path 82 when the first switch section 12 is in the on state, and allows electricity to flow in both directions between the first power path 81 and the second power path 82 when the first switch section 12 is in the off state. Current is blocked from flowing from the power path 82 to the first power path 81, and current is allowed to flow from the first power path 81 to the second power path 82. In any case, when the first switch section 12 is in the OFF state, the flow of current from the second power path 82 to the first power path 81 is blocked.

The charging unit 20 is provided between the first power path 81 and the power storage unit 13. Charging unit 20 performs a charging operation of supplying current to power storage unit 13 based on the power supplied from power supply unit 10 via first power path 81 . In the example of FIG. 1, charging section 20 includes a second switch section 21 and a resistor section 22. The second switch unit 21 may be configured by two FETs (Field Effect Transistors) arranged in opposite directions, or may be configured by other semiconductor switches that can bidirectionally interrupt current flow. The resistance section 22 is configured, for example, as a known resistor. In the example of FIG. 1, the second switch section 21 and the resistance section 22 are connected in series with each other. The second switch section 21 is arranged closer to the power supply section 10 than the resistance section 22 is. When the charging voltage of the power storage unit 13 is lower than the voltage of the first power path 81 and a charging operation is performed to turn on the second switch unit 21, a charging current is transferred from the first power path 81 to the power storage unit 13. flows. When the second switch section 21 is in the off state, charging is stopped, current does not flow from the first power path 81 to the conductive path 83, and no current flows from the conductive path 83 to the first power path 81. In the representative example of this embodiment, the output voltage applied to the first power path 81 when the power supply section 10 is fully charged is higher than the output voltage applied to the conductive path 83 when the power storage section 13 is fully charged.

The discharge unit 30 is provided between the power storage unit 13 and the second power path 82. The discharging unit 30 performs a discharging operation based on the power supplied from the power storage unit 13 so as to cause a current to flow to the load 11 side via the second power path 82. The discharge section 30 includes a conductive path 31, a voltage conversion circuit 32, and a cutoff section 14. The conductive path 31 is a conductive path that serves as a path for supplying discharge current to the load 11 side. One end of the conductive path 31 may be electrically connected to a second power path 82 via a conductive path 84, which will be described later. One end of voltage conversion circuit 32 is electrically connected to power storage unit 13 via conductive path 83 and short-circuited to conductive path 83 and the positive electrode of power storage unit 13 . The other end of the voltage conversion circuit 32 is electrically connected to the other end of the conductive path 31 in a short-circuited manner. Voltage conversion circuit 32 performs a voltage conversion operation to step up or step down the input voltage based on power storage unit 13 and apply an output voltage to conductive path 31 . The voltage conversion circuit 32 is, for example, a DC/DC converter (for example, a step-up DC/DC converter), and boosts the input voltage based on the power storage unit 13 (specifically, the voltage of the conductive path 83) and applies an output voltage to the conductive path 31. do. The discharge unit 30 performs a discharge operation when the voltage conversion circuit 32 performs a voltage conversion operation, and stops the discharge operation when the voltage conversion circuit 32 stops the voltage conversion operation.

The conductive path 84 is provided between the second power path 82 and the discharge section 30. The blocking section 14 is provided between the conductive path 84 and the conductive path 31. The cutoff section 14 may be configured by, for example, FETs arranged in opposite directions, or may be configured by other semiconductor switches that bidirectionally cut off current flow. In this case, when the cut-off unit 14 is in the ON state, the cut-off unit 14 prevents both the energization between the second power path 82 and the conductive path 31 (specifically, the energization between the second power path 82 and the voltage conversion circuit 32). When it is in the OFF state, the conduction between the second power path 82 and the conductive path 31 is interrupted in both directions.

In a typical example, the cutoff unit 14 is configured to cut off electricity in both directions when the cutoff unit 14 is in the OFF state. In this example, the cutoff unit 14 switches between a cutoff state (off state) in which the current is blocked from flowing from the conductive path 31 to the second power path 82 via itself, and an allowable state (on state) in which it is permitted.

The first voltage detection section 51, the second voltage detection section 52, and the third voltage detection section 53 are each configured as a known voltage detection circuit. The first voltage detection section 51 detects the voltage of the power path 80 (more specifically, the first power path 81), and provides the control section 61 with a voltage signal that can specify the voltage of the power path 80. Second voltage detection section 52 provides control section 61 with a voltage signal that can specify the voltage of conductive path 83, that is, the output voltage of power storage section 13. The third voltage detection section 53 provides the control section 61 with a voltage signal that can specify the voltage of the conductive path 31.

The in-vehicle control device 60 is a device that controls the charging operation by the charging section 20 and the discharging operation by the discharging section 30. The on-vehicle control device 60 includes a control section 61 .

The control unit 61 is a device that controls the charging unit 20 and the discharging unit 30. In the representative example described below, the control section 61 also controls the first switch section 12 and the cutoff section 14. The control unit 61 is configured as, for example, an MCU (Micro Controller Unit). Signals given from the first voltage detection section 51 , the second voltage detection section 52 , and the third voltage detection section 53 are input to the control section 61 . Based on these signals, the control unit 61 controls the voltage of the power path 80 (more specifically, the first power path 81), the output voltage of the power storage unit 13, and the voltage of the conductive path 31 (that is, the output voltage of the discharge unit 30). ).

When controlling the charging unit 20, the control unit 61 provides the second switch unit 21 of the charging unit 20 with a PWM signal that periodically outputs an on signal that turns on the second switch unit 21, and Controls the signal duty. Control unit 61 then adjusts the charging current applied to power storage unit 13 by adjusting the PWM signal applied to second switch unit 21 . Note that the method of controlling the charging current by the control unit 61 is not limited to this example, and other known methods may be used.

For example, the control unit 61 can cause the voltage conversion circuit 32 to perform a voltage conversion operation so that the voltage applied to the conductive path 31 becomes the target voltage.

The following explanation relates to the operation of the vehicle-mounted control device 60.
The control unit 61 starts backup support control as shown in FIG. 2 when a predetermined start condition is satisfied. The start condition may be, for example, that the starting switch of the vehicle in which the in-vehicle system 100 is installed is switched from an off state to an on state. In this case, the starting switch may be, for example, an ignition switch or a power switch provided in the electric vehicle. The above-mentioned start condition may be other than the above-mentioned condition, for example, it may be that a predetermined signal is received from an external ECU (Electronic Control Unit), or it may be another condition.

When the control unit 61 starts the control shown in FIG. 2, it determines in step S1 whether the voltage of the power path 80 (specifically, the voltage of the first power path 81) is equal to or lower than the low voltage threshold Vth1. The low voltage threshold Vth1 corresponds to a first threshold. The low voltage threshold Vth1 is a value greater than 0V. The low voltage threshold Vth1 is a value smaller than the output voltage of the power supply section 10 when fully charged, and a value larger than the failure determination voltage Vth2 described later.

When the control unit 61 determines in step S1 that the voltage of the first power path 81 is not equal to or lower than the low voltage threshold Vth1, the control unit 61 advances the process to step S2. If the first switch unit 12 is in the on state immediately before the start of step S2, the control unit 61 maintains the on state of the first switch unit 12 in step S2, and turns the first switch unit 12 on immediately before the start of step S2. If it is in the off state, the first switch section 12 is turned on in step S2. If the first switch unit 12 is in the on state when the voltage of the first power path 81 is not lower than the low voltage threshold Vth1, power can be supplied from the power supply unit 10 to the load 11.

After step S2, the control unit 61 advances the process to step S3. The control unit 61 maintains the discharge stopped state in step S3 if the discharge by the discharge unit 30 has stopped immediately before the start of step S3, and maintains the state in which the discharge by the discharge unit 30 is being performed just before the start of step S3. If so, the state is switched to a discharge stop state in step S3. The discharge stop state is a state in which no current is supplied from the discharge section 30 to the second power path 82. The discharge stop state may be a state in which the voltage conversion circuit 32 performs a voltage conversion operation to apply an output voltage to the conductive path 31 and the cutoff section 14 is turned off (blocked state). The discharge stop state may be a state in which the voltage conversion circuit 32 is stopped so as not to perform a voltage conversion operation, and the conductive path 83 and the conductive path 31 are electrically disconnected.

After step S3, the control unit 61 advances the process to step S4 and determines whether a predetermined charging condition is satisfied. The charging condition is, for example, that "the output voltage of power storage unit 13 (voltage of conductive path 83) is equal to or lower than threshold voltage Vth4." Threshold voltage Vth4 corresponds to a fourth threshold. Threshold voltage Vth4 is a value larger than 0V. For example, it is desirable that the threshold voltage Vth4 is a value lower than the low voltage threshold Vth1. However, the threshold voltage Vth4 may be a higher value than the low voltage threshold Vth1, or may be the same as the low voltage threshold Vth1. Note that the charging condition is not limited to the above-mentioned example, and may be, for example, "the voltage of the first power path 81 is higher than the voltage of the conductive path 83." In the representative example described below, the charging condition is that "the voltage of the conductive path 83 is equal to or lower than the threshold voltage Vth4", and the threshold voltage Vth4 is a value lower than the low voltage threshold Vth1.

If the control unit 61 determines in step S4 that the charging condition is satisfied, the process proceeds to step S5, and if it is determined that the charging condition is not satisfied, the control unit 61 proceeds to step S6. If the control unit 61 is in the charging operation state immediately before the start of step S5, it maintains the charging operation state in step S5, and if it is in the charging stop state immediately before the start of step S5, it changes it to the charging operation state in step S5. If the control unit 61 is in the charging stopped state immediately before the start of step S6, it maintains the charging stopped state in step S6, and if it is in the charging operation state just before the start of step S6, it changes it to the charging stopped state in step S6. In the example of FIG. 1, the charging operation state is a state in which the second switch section 21 is maintained in the on state. The charging stop state is a state in which the second switch section 21 is maintained in an off state. When the charging is stopped in step S6, power can be supplied from the power supply unit 10 to the load 11 while the charging operation is stopped as shown in FIG. In the charging operation state, when the voltage of the first power path 81 is higher than the voltage of the conductive path 83, a charging current based on the power from the power supply section 10 is supplied to the power storage section 13. Therefore, when entering the charging operation state in step S5, if the voltage of the first power path 81 is higher than the voltage of the conductive path 83, power is not supplied from the power supply unit 10 to the power storage unit 13 as shown in FIG. At the same time, power can be supplied to the load 11. The control unit 61 returns the process to step S1 after step S5 or step S6.

If the control unit 61 determines in step S1 that the voltage of the first power path 81 is equal to or lower than the low voltage threshold Vth1, the control unit 61 advances the process to step S7. If the first switch unit 12 is in the off state immediately before the start of step S7, the control unit 61 maintains the off state of the first switch unit 12 in step S7, and switches the first switch unit 12 to the off state immediately before the start of step S7. If it is in the on state, the first switch section 12 is turned off in step S7.

After step S7, the control unit 61 advances the process to step S8. If the control unit 61 is in the discharging operation state immediately before the start of step S8, the control unit 61 maintains the discharging operation state in step S8, and if the discharge by the discharge unit 30 has stopped immediately before the start of step S8, the control unit 61 maintains the discharging operation state in step S8. Switch to operating state. The discharging operation state is a state in which the discharging unit 30 is performing a discharging operation, and is a state in which the discharging unit 30 supplies a discharging current to the second power path 82 based on the power from the power storage unit 13. Specifically, the discharging operation state is a state in which the cutoff section 14 is on and the voltage conversion circuit 32 is converting the voltage so as to apply a target voltage to the conductive path 31. The target voltage may be a low voltage threshold Vth1, a value greater than the low voltage threshold Vth1, or a value smaller than the low voltage threshold Vth1. The target voltage is, for example, a value larger than the failure determination voltage Vth2. If the first switch unit 12 is in the discharge operation state while being maintained in the off state, current is supplied from the voltage conversion circuit 32 to the second power path 82 based on the power supplied from the power storage unit 13. .

After step S8, the control unit 61 advances the process to step S9 and determines whether the above charging condition is satisfied. If the control unit 61 determines in step S9 that the charging condition is satisfied, the process proceeds to step S10, and if it is determined that the charging condition is not satisfied, the control unit 61 advances the process to step S11. If the control unit 61 is in the charging operation state immediately before the start of step S10, it maintains the charging operation state in step S10, and if it is in the charging stop state immediately before the start of step S10, it changes it to the charging operation state in step S10. If the control unit 61 is in the charging stopped state immediately before the start of step S11, it maintains the charging stopped state in step S11, and if it is in the charging operation state just before the start of step S11, it puts it in the charging stopped state in step S11. In this typical example, the control unit 61 causes the discharge unit 30 to perform a discharging operation when the voltage of the power path 80 (more specifically, the first power path 81) is equal to or lower than the low voltage threshold Vth1, and When the output voltage of section 13 (voltage of conductive path 83) is equal to or lower than threshold voltage Vth4, charging section 20 is caused to perform a charging operation. Control in which the control unit 61 causes the charging unit 20 to perform a charging operation and the discharging unit 30 to perform a discharging operation corresponds to an example of the first control. When entering the charging operation state in step S10, if the voltage of the first power path 81 is higher than the voltage of the conductive path 83, power is not supplied from the power supply unit 10 to the power storage unit 13 side as shown in FIG. At the same time, power can be supplied to the load 11 based on the power from the power storage unit 13 side.

When setting the discharging operation state in step S8 and charging operation state in step S10, the control unit 61 controls the charging unit 20 during a period in which the discharging operation by the discharging unit 30 and the charging operation by the charging unit 20 are performed in parallel. Control is performed so that the power supplied to power storage unit 13 is greater than or equal to the power supplied by discharge unit 30 through discharge. The specific control method is not limited. For example, the control unit 61 calculates the power per unit time that the discharge unit 30 supplies by discharging, and controls the power so that the power per unit time that the charging unit 20 supplies to the power storage unit 13 is equal to or greater than the calculated value. The charging unit 20 may be caused to perform a charging operation. “The power per unit time that the discharge unit 30 supplies by discharging” may be calculated based on, for example, the voltage of the conductive path 31 and the current flowing through the conductive path 31. “Power per unit time that charging unit 20 supplies to power storage unit 13” is calculated based on, for example, the voltage of the path between charging unit 20 and conductive path 83 and the current flowing through that path. You can.

After step S10 or step S11, the control unit 61 advances the process to step S12, and in step S12, the voltage of the power path 80 (specifically, the voltage of the first power path 81) is equal to or lower than the failure determination voltage Vth2. Determine whether or not. The failure determination voltage Vth2 corresponds to a second threshold value. Failure determination voltage Vth2 has a value larger than 0V. Failure determination voltage Vth2 is a value smaller than low voltage threshold Vth1. Failure determination voltage Vth2 is a value smaller than threshold voltage Vth4. If the control unit 61 determines in step S12 that the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2, the process proceeds to step S13, and the voltage of the first power path 81 is equal to or lower than the failure determination voltage. If it is determined that it is not less than Vth2, the process returns to step S1.

When proceeding to step S13, the control unit 61 determines whether a predetermined failure determination condition is satisfied in step S13. The failure determination condition is, for example, that "the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2 for a certain period of time". In step S13, if the control unit 61 determines that the failure determination condition is satisfied, the process proceeds to step S14, and if it is determined that the failure determination condition is not satisfied, the control unit 61 returns the process to step S1. In the present embodiment, the control unit 61 is configured to detect a failure that satisfies a voltage condition in which the voltage of the power path 80 (specifically, the voltage of the first power path 81) is equal to or lower than the failure determination voltage Vth2 and is different from the voltage condition. When the determination condition is not satisfied (No in step S13), the first control is executed when the charging condition is satisfied. Specifically, the first control is performed when the determination is Yes in step S12 immediately after step S10 and the determination is No in step S13, and when the first control is performed, the power is reduced as in FIG. Supplied.

If the control unit 61 is in the charging stopped state immediately before the start of step S14, it maintains the charging stopped state in step S14, and if it is in the charging operation state just before the start of step S14, it changes it to the charging stopped state in step S14. “Control that causes the discharging unit 30 to perform a discharging operation without causing the charging unit 20 to perform a charging operation” corresponds to an example of the second control. In a typical example, the control unit 61 controls the time period during which the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2 after the voltage of the first power route 81 satisfies the voltage condition that the voltage of the first power route 81 is equal to or lower than the failure determination voltage Vth2. If it continues for a certain period of time, the second control is executed in step S14, causing the charging section 20 to stop the charging operation, causing the discharging section 30 to perform the discharging operation, and maintaining the first switch section 12 in the off state. When the second control is performed in step S14 in this way, in a state where the power supply from the power supply unit 10 to the load 11 is stopped and in a state where the power supply from the power supply unit 10 to the power storage unit 13 is stopped, as shown in FIG. Electric power is supplied from power storage unit 13 to load 11 .

As described above, in step S14, the control unit 61 performs control to stop the charging operation while performing the discharging operation, but in addition to or instead of stopping the charging operation, the control unit 61 performs control to stop the charging operation, but in addition to or instead of stopping the charging operation, A notification signal may be output to notify an ECU (such as an ECU different from the on-vehicle control device 60) that the power supply section 10 has failed. In this example, when the external device receives the notification signal, the external device may notify a person in the vehicle of an abnormality (for example, notification that a power failure has occurred) by audio or display. .

In the representative example described above, the control unit 61 causes the voltage of the first power path 81 to become the failure determination voltage Vth2 after satisfying the "voltage condition that the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2". The first switch section 12 is maintained in the OFF state until a certain period of time has elapsed (that is, while the determinations of Yes in steps S1 and S12 and No in step S13 are repeated). Therefore, the first power path 81 and the second power path 82 can be electrically cut off during a period when there is a risk of failure.

In a typical example, the control unit 61 determines the time period during which the first power path 81 is equal to or less than the failure determination voltage Vth2 after satisfying the voltage condition that "the voltage of the first power route 81 is equal to or less than the failure determination voltage Vth2." The first switch section 12 is turned on on the condition that the voltage of the first power path 81 exceeds the failure determination voltage Vth2 before a certain period of time has elapsed. For example, if the voltage of the first power path 81 exceeds the low voltage threshold Vth1 while the determinations of Yes in steps S1 and S12 and No in step S13 are repeated, the first switch unit 12 is turned on in step S2. Make it. Therefore, even if the voltage of the first power path 81 temporarily falls below the failure determination voltage Vth2, if the voltage of the first power path 81 returns to exceed the low voltage threshold Vth1 before the above-mentioned certain period of time elapses, can be returned to normal operation.

The above description relates to the effects of the in-vehicle control device 60.
When the voltage of the power path 80 is equal to or lower than the failure determination voltage Vth2, the vehicle-mounted control device 60 discharges the power storage unit 13 and supplies power to the load 11 early even if the failure determination condition is not satisfied. Can be done. Therefore, this in-vehicle control device 60 can suppress the risk of interruption of power supply to the load 11 in the event of a power failure. On the other hand, if the voltage of the power path 80 is equal to or lower than the failure determination voltage Vth2, the charging operation by the charging unit 20 can be continued unless the failure determination conditions are met, so even if the voltage temporarily due to noise etc. Even if the discharge of power storage unit 13 increases due to a decrease in the voltage of power path 80, a decrease in the degree of charge of power storage unit 13 can be suppressed.

The in-vehicle control device 60 executes the second control when the voltage of the power line 80 continues to be equal to or lower than the failure determination voltage Vth2 for a certain period of time, that is, when the possibility of a power failure increases further. By stopping the charging operation, it is possible to suppress the influence caused by the state of the power path 80 from reaching the power storage unit 13 side due to the charging operation. For example, if a ground fault occurs in the first power path 81 and the failure determination voltage drops below Vth2, if the charging operation time becomes too long, the power storage unit 13 will be discharged from the power storage unit 13 to the ground fault location. There is a concern that the energy stored in the battery will disappear, but if the charging operation is stopped when the voltage is below the failure determination voltage Vth2 for a certain period of time, the subsequent discharge can be suppressed.

When the voltage of the first power path 81 becomes equal to or lower than the failure determination voltage Vth2, the in-vehicle control device 60 controls the first switch unit 12 (switch part) can be turned off to prevent current from flowing from the second power path 82 to the first power path 81. Therefore, if the voltage of the first power path 81 is lower than the failure determination voltage Vth2 due to a power supply failure, the discharge current is supplied to the load 11 from the power storage unit 13 and the discharge current is supplied to the first power path 81. It is possible to reliably prevent it from going around. On the other hand, if the on-vehicle control device 60 exceeds the failure determination voltage Vth2 again before the time period during which the first power path 81 is equal to or less than the failure determination voltage Vth2 has elapsed for a certain period of time after satisfying the above voltage condition, Then, by switching the first switch section 12 to the on state, the power supply section 10 can return to supplying power to the load 11. Therefore, even if the voltage of the first power path 81 temporarily falls below the failure determination voltage Vth2 due to noise or the like, normal operation can be quickly restored if the voltage returns quickly. Even if the discharging operation based on such a temporary voltage drop is repeated, since the charging operation is likely to be performed each time, a decrease in the degree of charging of the power storage unit 13 can be suppressed. Furthermore, after the voltage condition is satisfied, if a certain period of time has elapsed during which the first power path 81 is below the failure determination voltage, the in-vehicle control device 60 turns off the first switch unit 12 and stops charging. In order to stop the operation, if the possibility of power failure increases further, the power storage unit 13 A discharge current can be supplied to the load 11.

<Second embodiment>
The vehicle-mounted control device 60 of the second embodiment is the same as the vehicle-mounted control device 60 of the first embodiment except for the failure determination conditions. The in-vehicle system 100 in which the in-vehicle control device 60 of the second embodiment is used is the same as the in-vehicle system 100 in which the in-vehicle control device 60 of the first embodiment is used except for the failure determination conditions, and the in-vehicle system 100 uses the in-vehicle control device 60 of the first embodiment. make up a composition. Further, the backup support control performed by the control unit 61 of the in-vehicle control device 60 of the second embodiment is the same as the backup support control performed by the in-vehicle control device 60 of the first embodiment, except for the specific determination method in step S13. be. Therefore, below, the vehicle-mounted control device 60 of the second embodiment will be explained with reference to FIGS. 1 and 2.

In the vehicle-mounted control device 60 of the second embodiment, when the control unit 61 performs the backup control shown in FIG. shall be. That is, when the control unit 61 determines in step S13 that "current is flowing from the charging unit 20 side to the power path 80 side", it determines that the failure determination condition is satisfied in step S13, and executes the process. Proceed to step S14. On the other hand, if the control unit 61 determines in step S13 that "current is not flowing from the charging unit 20 side to the power line 80 side", it determines that the failure determination condition is not satisfied in step S13, and performs processing. Return to step S1. When the control unit 61 determines in step S13 that the failure determination condition is satisfied (that is, when the current flows from the charging unit 20 side to the power path 80 side), the control unit 61 executes the above-described second control in step S14.

Determination as to whether or not current is flowing from the charging unit 20 side to the power path 80 side can be performed using various methods. For example, when the second switch section 21 is in the on state, the voltages at both ends of the resistor section 22 are detected, and in the resistor section 22, the voltage at the terminal on the first power path 81 side is higher than the voltage at the terminal on the conductive path 83 side. If the current is low, the control unit 61 may determine that “current is flowing from the charging unit 20 side to the power path 80 side”. Alternatively, the current sensor may be provided in a configuration in which it is connected in series to the second switch section 21 and the resistance section 22 in a path in which the second switch section 21 and the resistance section 22 are provided in series. In this case, the control unit 61 acquires the detected value of the current sensor, and when a current of a certain value or more is flowing in the direction from the charging unit 20 toward the first power path 81, the control unit 61 performs “from the charging unit 20 side to the power path 81”. It may be determined that the current is flowing to the 80 side.

In the vehicle-mounted control device 60 of the second embodiment, the first switch section 12 (switch section) is also provided in the power path 80. Charging unit 20 supplies current to power storage unit 13 based on power supplied from first power path 81 (power path on power path 80 closer to power supply unit 10 than first switch unit 12). Then, the discharging section 30 performs a discharging operation so as to cause current to flow through the second power path 82 (the power path on the side of the load 11 rather than the first switch section 12 in the power path 80). When the first switch section 12 is in the on state, electricity is allowed to pass between the first power path 81 and the second power path 82 in both directions, and when the first switch section 12 is in the off state, at least the second power path 82 energization to the first power path 81 is cut off. Note that when the first switch section 12 is in the off state, it is desirable that the current flow between the first power path 81 and the second power path 82 is interrupted in both directions; however, when the first switch section 12 is in the off state, A configuration may be adopted in which energization from the first power path 81 to the second power path 82 is permitted.

In the second embodiment, the control unit 61 satisfies the above-mentioned voltage condition (voltage condition that the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2), and the current flows from the charging unit 20 side to the power path 80 side. The first control can be executed on the condition that no flow occurs. Specifically, after step S10, when determining Yes in step S12 and determining No in step S13, the control unit 61 turns off the first switch unit 12 and causes the charging unit 20 to perform the charging operation. The first control is executed to cause the discharge unit 30 to perform a discharge operation while causing the discharge unit 30 to perform a discharge operation. On the other hand, the control unit 61 controls the first switch unit 12 when the voltage of the first power path 81 satisfies the voltage condition that the voltage is equal to or lower than the failure determination voltage Vth2 and the current flows from the charging unit 20 side to the power path 80 side. The second control is executed while being in the off state. Specifically, when determining Yes in step S12 and Yes in step S13, the control unit 61 turns off the first switch unit 12 and does not cause the charging unit 20 to perform a charging operation. The second control is executed to cause the discharge section 30 to perform a discharge operation.

The in-vehicle control device 60 according to the present embodiment can also allow the charging unit 20 to continue the charging operation if the failure determination condition is not satisfied when the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2. Therefore, even if the amount of discharge of power storage unit 13 increases due to noise or the like, a decrease in the degree of charging of power storage unit 13 can be suppressed. On the other hand, when the voltage of the first power path 81 is equal to or lower than the failure determination voltage Vth2, the vehicle-mounted control device 60 executes the second control when a current flows from the charging unit 20 side to the power path 80 side. and stop charging operation. Through such control, in-vehicle control device 60 can suppress the influence caused by the state of power path 80 from reaching power storage unit 13 due to the charging operation. For example, if a ground fault occurs in the power line 80 and the voltage of the power line 80 becomes equal to or lower than the failure determination voltage Vth2 due to the ground fault, there is a risk that a large current will flow into the ground fault location if the charging operation is continued. However, if the second control is executed when the current flows from the charging unit 20 side to the power path 80 side, such a problem is unlikely to occur.

The in-vehicle control device 60 of this embodiment operates on the condition that when the voltage of the first power path 81 becomes equal to or lower than the failure determination voltage Vth2, no current flows from the charging unit 20 side to the power path 80 side. Execute control. Therefore, when the voltage of the first power path 81 becomes equal to or lower than the failure determination voltage Vth2, the charging operation can be performed after confirming that the possibility of a ground fault is low. On the other hand, if the voltage of the first power path 81 becomes equal to or lower than the failure determination voltage Vth2 and current flows from the charging unit 20 side to the power path 80 side, that is, if there is a high possibility of a ground fault, Executing the second control by turning off the first switch unit 12 and preventing current from flowing from the second power path 82 to the first power path 81 and from flowing from the power storage unit 13 to the first power path 81, A discharge current based on power storage unit 13 can be supplied to load 11 .

<Third embodiment>
The vehicle-mounted control device 60 of the third embodiment is the same as the vehicle-mounted control device 60 of the first embodiment except for the failure determination conditions. The in-vehicle system 100 in which the in-vehicle control device 60 of the third embodiment is used is the same as the in-vehicle system 100 in which the in-vehicle control device 60 of the first embodiment is used except for the failure determination conditions, and the in-vehicle system 100 uses the in-vehicle control device 60 of the first embodiment. make up a composition. Further, the backup support control performed by the control unit 61 of the in-vehicle control device 60 of the third embodiment is the same as the backup support control performed by the in-vehicle control device 60 of the first embodiment, except for the specific determination method in step S13. be. Therefore, below, the vehicle-mounted control device 60 of the third embodiment will be explained with reference to FIGS. 1 and 2.

In the vehicle-mounted control device 60 of the third embodiment, when the control unit 61 performs the backup control shown in FIG. The condition for determining failure is ``has become ``. Reference voltage Vth3 corresponds to the third threshold. Reference voltage Vth3 has a value greater than zero. Reference voltage Vth3 is a value smaller than threshold voltage Vth4. If the control unit 61 determines in step S13 that "the voltage of the first power path 81 is equal to or lower than the reference voltage Vth3," it determines that the failure determination condition is satisfied in step S13, and the process proceeds to step S14. Proceed. On the other hand, if the control unit 61 determines in step S13 that "the voltage of the first power path 81 is higher than the reference voltage Vth3", it determines in step S13 that the failure determination condition is not satisfied, and executes the process. Return to step S1. When the control unit 61 determines in step S13 that the failure determination condition is satisfied (that is, when the voltage of the first power path 81 is equal to or lower than the reference voltage Vth3), the control unit 61 executes the second control described above in step S14. , the discharging section 30 is caused to perform a discharging operation without causing the charging section 20 to perform a charging operation.

<Other embodiments>
The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, the features of the embodiments described above or below can be combined in any combination without contradicting each other. Furthermore, any feature of the embodiments described above or below may be omitted unless explicitly stated as essential. Furthermore, the embodiment described above may be modified as follows.

In the embodiment described above, the control unit 61 performs the above-mentioned charging when the voltage of the power path 80 satisfies the voltage condition that the voltage is equal to or lower than the failure determination voltage Vth2 and does not satisfy the failure determination condition different from the voltage condition. The first control is executed when the conditions are met, but the first control may be executed whenever the voltage conditions are met and the failure determination conditions are not met.

In the embodiment described above, the vehicle-mounted control device 60 includes at least the control unit 61, but the vehicle-mounted control device 60 may include the entire power supply system 3.

In the embodiments described above, the power supply system 3 includes the power supply unit 10 and the power storage unit 13, but in the embodiments described above, even when the on-vehicle control device 60 is configured to include the entire power supply system 3, the power supply system 3 includes the power supply unit 10 and the power storage unit 13. 3 may be changed to a configuration in which only the power supply unit 10 is removed from the configuration of the power supply system 3 described above, or may be changed to a configuration in which only the power storage unit 13 is removed from the configuration of the power supply system 3 described above. , the configuration of the power supply system 3 described above may be changed to a configuration in which the power supply unit 10 and the power storage unit 13 are removed.

In the embodiment described above, as an example of the cutoff unit 14, a switching element having a predetermined structure that switches between a state of permitting bidirectional energization and a state of blocking bidirectional energization is exemplified, but is not limited to this example. For example, the interrupter 14 in FIG. 1 is constituted by a single FET having a parasitic diode whose anode is connected to short-circuit to the conductive path 31 and whose cathode is connected to short-circuit to the second power path 82. Good too. Alternatively, the cutoff unit 14 in FIG. 1 may be changed to a diode whose anode is electrically connected to the conductive path 31 and whose cathode is electrically connected to the conductive path 84.

In the embodiment described above, the first switch section 12 is illustrated as an example of an element provided in the power path 80, but the first switch section 12 blocks the flow of current from the load 11 side to the power supply section 10 side. It may be changed to other types of elements that can be used. For example, in the configuration of FIG. 1, the first switch section 12 may be changed to a diode, and in this case, the anode of the diode is electrically connected to the first power path 81, and the cathode is connected to the second power path 81. It may be electrically connected to short circuit 82 .

In the embodiment described above, the charging section 20 has a configuration including the second switch section 21 and the resistance section 22, but it may have a different configuration. For example, the charging unit 20 may be configured by a voltage conversion circuit (for example, a DCDC converter), and in this case, the voltage conversion circuit performs a step-up operation or a step-down operation using the voltage applied to the first power path 81 as an input voltage. may be performed, and a charging operation (voltage conversion operation) may be performed so as to apply an output voltage to the conductive path 83.

In the embodiment described above, the discharge section 30 has a configuration that includes the voltage conversion circuit 32, but may have a configuration that does not include the voltage conversion circuit 32. For example, the discharge section 30 may be changed to a switching element.

It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope indicated by the claims or within the range equivalent to the claims. be done.

3: Vehicle power supply system 10: Power supply section 11: Load 12: First switch section 13: Power storage section 14: Cutoff section 20: Charging section 21: Second switch section 22: Resistance section 30: Discharge section 31: Conductive path 32 :Voltage conversion circuit 51 :First voltage detection section 52 :Second voltage detection section 53 :Third voltage detection section 60 :In-vehicle control device 61 :Control section 80 :Power path 81 :First power path 82 :Second power Path 83: Conductive path 84: Conductive path 100: In-vehicle system

Claims

a power supply section, a power storage section different from the power supply section, a power path that is a path for supplying power from the power supply section to a load, and supplying current to the power storage section based on the power supplied from the power supply section. It is used in an in-vehicle system comprising a charging unit that performs a charging operation, and a discharging unit that performs a discharging operation that causes current to flow to the load side based on the power supplied from the power storage unit, and the charging unit performs the charging operation and An on-vehicle control device that controls the discharge operation by the discharge section,
comprising a control unit that controls the charging unit and the discharging unit,
The control section includes a first control that causes the discharging section to perform the discharging operation while causing the charging section to perform the charging operation, and a first control that causes the discharging section to perform the discharging operation without causing the charging section to perform the charging operation. and a second control to perform the first control when the voltage of the power path satisfies a voltage condition that is equal to or less than a failure determination voltage and does not satisfy a failure determination condition different from the voltage condition. An in-vehicle control device that performs control.
The failure determination condition includes that the voltage of the power path is equal to or lower than the failure determination voltage for a certain period of time,
The in-vehicle control device according to claim 1, wherein the control unit executes the second control when the time during which the voltage of the power path is equal to or lower than the failure determination voltage continues for the certain period of time.
The in-vehicle system includes a switch section provided in the power path,
The charging unit supplies current to the power storage unit based on power supplied from a first power path closer to the power supply unit than the switch unit in the power path,
The discharging unit performs the discharging operation so as to cause a current to flow in a second power path on the load side of the power path rather than the switch unit,
When the switch section is in an on state, bidirectional energization is allowed between the first power path and the second power path, and when the switch section is in an off state, at least the second power path to the first power path is allowed to flow between the first power path and the second power path. Power is cut off to
After the voltage condition is met, the control section keeps the switch section in the OFF state until a certain period of time during which the power path is below the failure determination voltage has elapsed, and after the voltage condition is met, The switch section is brought into the on state on the condition that the voltage of the power path exceeds the failure determination voltage before the predetermined period of time during which the power path is lower than or equal to the failure determination voltage elapses; The in-vehicle device according to claim 2, wherein after the condition is met, when the predetermined period of time during which the power path is below the failure determination voltage has elapsed, the charging operation is stopped while the switch section is turned off. control device.
The failure determination condition includes that a current flows from the charging unit side to the power path side,
The vehicle-mounted control device according to claim 1, wherein the control unit executes the second control when a current flows from the charging unit side to the power path side.
The in-vehicle system includes a switch section provided in the power path,
The charging unit supplies current to the power storage unit based on power supplied from a first power path closer to the power supply unit than the switch unit in the power path,
The discharging unit performs the discharging operation so as to cause a current to flow in a second power path on the load side of the power path rather than the switch unit,
When the switch section is in an on state, bidirectional energization is allowed between the first power path and the second power path, and when the switch section is in an off state, at least the second power path to the first power path is allowed to flow between the first power path and the second power path. Power is cut off to
The control unit executes the first control on condition that the voltage condition is satisfied and no current flows from the charging unit side to the power path side, and the control unit executes the first control on the condition that the voltage condition is satisfied and no current flows from the charging unit side to the power path side. The vehicle-mounted control device according to claim 4, wherein the second control is executed while turning off the switch section when a current flows through the switch section.
The failure determination condition includes that the voltage of the power path has become equal to or less than a reference voltage that is smaller than the failure determination voltage,
The in-vehicle control device according to claim 1, wherein the control unit executes the second control when the voltage becomes equal to or less than the reference voltage.