Power supply control device and power supply control method

Abstract

To provide a power supply control device which can shorten the time to resume automatic operation travel, as well as, can restrain durability of components from being deteriorated.SOLUTION: A power supply control device is provided with a controller. The controller performs propriety determination for determining whether or not backup by a backup power supply is possible when starting a vehicle which includes automatic operation travel function. if a position of the vehicle is in an automatic operation travel possible area that allows the automatic operation travel, the controller does not perform the propriety determination.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The disclosed embodiments relate to a power supply control device and a power supply control method. [Background technology]

[0002] When an autonomous vehicle equipped with a backup power supply is started up by turning on the vehicle's ignition switch (hereinafter referred to as "IG"), it performs a backup feasibility determination to determine whether autonomous driving and FOP (fail-over-power) in the event of an abnormality can operate normally. If the backup feasibility determination determines that the autonomous vehicle is capable of backup, the autonomous vehicle is permitted to drive autonomously (see, for example, Patent Document 1).

[0003] For example, while an autonomous vehicle is driving autonomously in an area where autonomous driving is permitted, such as a highway, it may stop at a service area along the way for a toilet break, etc. The autonomous vehicle's IG is temporarily turned off at the service area, and once the break is over, the IG is turned on and the vehicle resumes autonomous driving.

[0004] In this case, even though the autonomously driven vehicle has already performed a backup feasibility determination and determined that backup is possible before the IG is turned off, once the IG is turned on after the break, the autonomously driven vehicle will perform a backup feasibility determination again. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-72880 Summary of the Invention [Problem to be solved by the invention]

[0006] However, even though an autonomous vehicle has already performed a backup feasibility determination and determined that backup is possible before the IG is turned off, if the IG is turned on and a backup feasibility determination is made again, it will take a long time to resume autonomous driving. Also, if an autonomous vehicle frequently performs backup feasibility determinations, the durability of parts such as switches that are operated to determine backup feasibility will decrease.

[0007] One aspect of the embodiment has been made in consideration of the above, and aims to provide a power supply control device that can shorten the time until autonomous driving resumes and suppress deterioration of the durability of components. [Means for solving the problem]

[0008] According to one aspect of the embodiment, a power supply control device includes a controller. The controller determines whether backup power is possible when a vehicle having an autonomous driving function is started. The controller does not perform the determination if the vehicle is located within an autonomous driving permitted area. [Effects of the Invention]

[0009] A power supply control device and a power supply control method according to one aspect of the embodiment have the advantage of being able to shorten the time required to resume autonomous driving and suppress deterioration of the durability of components. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of the configuration of a power supply control device according to an embodiment. [Figure 2] FIG. 2 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the embodiment. [Figure 3] FIG. 3 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the embodiment. [Figure 4] FIG. 4 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the embodiment. [Figure 5]FIG. 5 is a flowchart showing an example of processing executed by the main controller of the power supply control device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply control device and a power supply control method according to embodiments will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0012] The power supply control device according to the embodiment is installed in an electric vehicle, a hybrid vehicle, or an internal combustion engine vehicle. The power supply control device according to the embodiment may be installed in any device that has a main power supply and a backup power supply, and that performs fail-over-power (FOP) by backing up the main power supply with the backup power supply in the event of a power failure in the main power supply.

[0013] [1. Power supply control device configuration] 1 is an explanatory diagram showing an example of the configuration of a power supply control device according to an embodiment. As shown in FIG. 1, a power supply control device 1 according to an embodiment is connected to a main power supply 10 and an external device 100.

[0014] Furthermore, the power supply control device 1 is connected to a first general load 101, a first FOP load 102, a second FOP load 103, a third FOP load 104, and a second general load 105. The power supply control device 1 also includes a first system 110 and a second system 120.

[0015] The first system 110 supplies power from the main power supply 10 to a first general load 101, a first FOP load 102, a second FOP load 103, a third FOP load 104, and a second general load 105. The second system 120 supplies power from a backup power supply 20 (described later) to the first FOP load 102, the second FOP load 103, and the third FOP load 104.

[0016] The first general load 101 and the second general load 105 include, for example, a display, an air conditioner, an audio device, a video device, various lights, a drive recorder, a security device, a communication device, and various sensors.

[0017] The first FOP load 102, the second FOP load 103, and the third FOP load 104 are devices for autonomous driving. For example, the first FOP load 102, the second FOP load 103, and the third FOP load 104 include a steering motor, an electric brake device, an in-vehicle camera, a radar, and the like that operate during autonomous driving. The first general load 101, the first FOP load 102, the second FOP load 103, the third FOP load 104, and the second general load 105 operate using power supplied from the power supply control device 1.

[0018] The external device 100 is, for example, an automatic driving control device. The external device 100 is a device that includes a GPS (Global Positioning System) and operates a first FOP load 102, a second FOP load 103, and a third FOP load 104 to control automatic driving of a vehicle.

[0019] When the power supply control device 1 is mounted on an engine vehicle, the main power supply 10 includes a generator 12 and a lead battery (hereinafter referred to as "PbB11"). The battery of the main power supply 10 may be any secondary battery other than PbB11.

[0020] The generator 12 is, for example, an alternator that generates electricity by converting the kinetic energy of a traveling vehicle into electricity. The generator 12 charges the PbB 11 and a backup power supply 20 (described later) with the generated power. The generator 12 also supplies power to a first general load 101, a first FOP load 102, a second FOP load 103, a third FOP load 104, and a second general load 105.

[0021] When the power supply control device 1 is mounted on an electric vehicle or a hybrid vehicle, the main power supply 10 includes a DC / DC converter (hereinafter referred to as "DCDC") and a PbB 11. In this case, the DCDC is connected to a generator and a high-voltage battery having a higher voltage than the PbB 11, and steps down the voltages of the generator and the high-voltage battery and outputs the voltage to the first system 110. The generator is, for example, an alternator that converts the kinetic energy of a running vehicle into electricity to generate power. The high-voltage battery is, for example, a battery for driving the vehicle that is mounted on an electric vehicle or a hybrid vehicle.

[0022] The power supply control device 1 also includes a backup power supply 20, a controller 3, a plurality of connection parts that supply power to a first general load 101, a first FOP load 102, a second FOP load 103, a third FOP load 104, and a second general load 105, and a DCDC 22.

[0023] Specifically, the power supply control device 1 includes a first connection portion 41, a second connection portion 42, a third connection portion 43, a fourth connection portion 44, a fifth connection portion 45, a sixth connection portion 46, a seventh connection portion 47, an eighth connection portion 48, a ninth connection portion 49, and a tenth connection portion 50.

[0024] The first connection unit 41 is a switch that can connect and disconnect the first system 110 and the second system 120. The first connection unit 41 may be a DCDC. In this case, the DCDC connects the first system 110 and the second system 120 by operating, and disconnects the connection between the first system 110 and the second system 120 by stopping the operation.

[0025] The second connection unit 42 is a switch capable of connecting and disconnecting the second system 120 and the first FOP load 102. The third connection unit 43 is a switch capable of connecting and disconnecting the second system 120 and the second FOP load 103. The fourth connection unit 44 is a switch capable of connecting and disconnecting the second system 120 and the third FOP load 104.

[0026] The fifth connection unit 45 is a switch capable of connecting and disconnecting the backup power supply 20 and the second system 120. The DCDC 22 is connected to the second system 120 so as to be connected in parallel to the fifth connection unit 45. The sixth connection unit 46 is a switch capable of connecting and disconnecting the first system 110 and the first general load 101. The seventh connection unit 47 is a switch capable of connecting and disconnecting the first system 110 and the first FOP load 102. The eighth connection unit 48 is a switch capable of connecting and disconnecting the first system 110 and the second FOP load 103. The ninth connection unit 49 is a switch capable of connecting and disconnecting the first system 110 and the second general load 105. The tenth connection unit 50 is a switch capable of connecting and disconnecting the first system 110 and the third FOP load 104.

[0027] The backup power supply 20 is a backup power supply in the event that the main power supply 10 is unable to supply power. The backup power supply 20 includes a lithium ion battery (hereinafter referred to as "LiB21"). Note that the battery of the backup power supply 20 may be any secondary battery other than the LiB21.

[0028] The power supply control device 1 also includes a first voltage sensor 51 and a second voltage sensor 52. The first voltage sensor 51 is provided in the first system 110, detects the voltage of the first system 110, and outputs the detection result to the controller 3. The second voltage sensor 52 is provided in the second system 120, detects the voltage of the second system 120, and outputs the detection result to the controller 3.

[0029] The controller 3 includes a microcomputer (hereinafter referred to as "microcomputer") having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and various other circuits. Note that some or all of the functions of the controller 3 may be configured with hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0030] The controller 3 controls the operations of the first to tenth connection units 41 to 50 and the DCDC 22 by the CPU executing a program stored in the ROM using the RAM as a work area.

[0031] [2. Example of power supply control device operation] Next, an example of the operation of the power supply control device 1 will be described with reference to Figures 2 to 4. Figures 2 to 4 are explanatory diagrams showing an example of the operation of the power supply control device 1 according to the embodiment.

[0032] [2.1. Normal operation] The controller 3 controls the multiple connections as shown in FIG. 2 during normal vehicle stoppage, manual driving, or automatic driving when the IG is on and no ground fault has occurred in the first system 110 and the second system 120.

[0033] Specifically, the controller 3 turns on the first to fourth and sixth to tenth connection parts 41 to 44 and 46 to 50 and turns off the fifth connection part 45. This enables the power supply control device 1 to supply power from the main power supply 10 to the first and second general loads 101 and 105 and the first to third FOP loads 102 to 104.

[0034] [2.2. Operation of power supply control device when a ground fault occurs] For example, as shown in FIG. 3, in the power supply control device 1, when a ground fault 200 occurs in the first system 110, an overcurrent flows toward the ground fault point, causing the voltage detected by the first voltage sensor 51 to become equal to or lower than the ground fault threshold value.

[0035] Therefore, when the voltage detected by the first voltage sensor 51 remains below the ground fault threshold for a predetermined period of time, the controller 3 detects a ground fault 200 in the first system 110, turns off the first connection part 41, turns on the fifth connection part 45, and turns off the sixth to tenth connection parts 46 to 50.

[0036] As a result, even if a ground fault 200 occurs in the first system 110, the power supply control device 1 can perform FOP control to supply power from the backup power supply 20 to the first to third FOP loads 102-104.

[0037] Thereafter, the controller 3 notifies the external device 100 that a ground fault 200 has occurred in the first system 110 and that control has shifted to FOP control. As a result, the external device 100 operates the first to third FOP loads 102 to 104 using the power supplied from the backup power supply 20, and causes the vehicle to evacuate to a safe place and stop.

[0038] [2.3. Operation during charging] The controller 3 charges the backup power supply 20 when the amount of electricity stored in the LiB 21 decreases. As shown in Fig. 4, the controller 3 acquires, for example, a State Of Charge (SOC) of the LiB 21 from the backup power supply 20 via an SOC acquisition line 23, and when the SOC of the LiB 21 drops to 65% or less, causes the DCDC 22 to perform a step-down operation. Then, the controller 3 supplies power from the main power supply 10 to the backup power supply 20 via the first connection unit 41 and the DCDC 22 to charge the backup power supply 20.

[0039] [3. Backup availability determination] When the IG is turned on and the power supply control device 1 starts up, it determines whether backup is possible to determine whether the FOP can operate normally in the event of automatic driving or an abnormality, and if it determines that backup is possible, it allows automatic driving.

[0040] For example, while an autonomous vehicle is driving autonomously in an area where autonomous driving is permitted, such as a highway, it may stop at a service area along the way for a toilet break, etc. In this case, the IG is temporarily turned off at the service area, and once the break is over, the IG is turned on and the autonomous driving resumes.

[0041] In this case, the vehicle is often parked for an extremely short time, but the power supply control device 1 has already performed a backup possibility determination and determined that backup is possible before the IG is turned off, and then performs a backup possibility determination again when the IG is turned on, even though only a short time has passed since then. This type of situation also occurs when the vehicle is parked at a location other than the home, such as a convenience store or gas station.

[0042] However, even though the power supply control device 1 has already performed a backup feasibility determination and determined that backup is possible before the IG is turned off, if the IG is turned on and the backup feasibility determination is performed again, it will take a long time to resume autonomous driving. Also, if an autonomous vehicle frequently performs backup feasibility determinations, the durability of parts such as switches that are operated to determine backup feasibility will decrease.

[0043] Therefore, the power supply control device 1 according to the embodiment includes a controller 3. When a vehicle having an autonomous driving function is started, the controller 3 determines whether backup by the backup power supply 20 is possible (hereinafter referred to as "backup possibility determination"). If the vehicle's position at the time of start-up is in an autonomous driving possible area where autonomous driving is permitted, the controller 3 does not perform the backup possibility determination, i.e., prohibits the backup possibility determination.

[0044] For example, when the vehicle is located within an area such as a highway, a motorway, a road with a width of a predetermined width or more, a service area, a shelter, or a safety zone where autonomous driving is permitted in advance, the controller 3 does not make a backup feasibility determination or omits part of the determination.

[0045] In other words, not making a backup feasibility determination in this embodiment not only means not making a determination on all items in the backup feasibility determination, but also includes making a determination on some items, such as the SOC determination described below, but not making a determination on the remaining items.

[0046] In addition, the controller 3 may be configured not to perform the backup feasibility determination, or to omit part of the determination, when the vehicle is parked at a location other than the home, such as a convenience store or gas station where the parking time is short.

[0047] As a result, the power supply control device 1 can immediately resume autonomous driving when, for example, the IG is turned on. Also, because the power supply control device 1 does not perform unnecessary backup feasibility determinations, the durability of the parts used for backup feasibility determinations is improved. For example, the power supply control device 1 can improve the durability of the first to tenth connection parts 41 to 50.

[0048] Specifically, the controller 3 does not perform a determination of whether or not backup is possible if the time elapsed from when the IG is turned off until it is turned on is within a first threshold time. The first predetermined time is, for example, one hour. Note that the first predetermined time may be a time other than one hour as long as it is a time during which the backup-enabled state is not expected to change.

[0049] In this case, if the controller 3 judged that backup is possible in the previous backup possibility judgment when the IG is turned on, it can more reliably estimate that no judgment is necessary because the time that has passed since then is less than one hour and the possibility that the backup possibility state has changed is low.

[0050] Furthermore, the controller 3 does not perform a determination of whether or not backup is possible if the elapsed time from the end of autonomous driving to turning on the IG is within a second threshold time. The second predetermined time is, for example, 1 hour and 15 minutes. Note that the second predetermined time may be a time other than 1 hour and 15 minutes as long as it is a time during which the backup availability status is not expected to change.

[0051] In this case, if the power supply control device 1 judges that backup is possible in the previous backup possibility judgment when the IG is turned on, it can more reliably estimate that no judgment is necessary because the time that has passed since then is within 1 hour and 15 minutes and the possibility that the backup possibility state has changed is low.

[0052] The backup availability determination includes a first determination (hereinafter, may be referred to as "backup availability determination (a)") for determining whether a switch for performing backup has failed. The controller 3 does not perform the first determination.

[0053] For example, when the IG is turned on, the controller 3 sequentially controls the first to tenth connection units 41 to 50 to turn them on / off and reads the voltage values ​​of the first voltage sensor 51 and the second voltage sensor 52, thereby performing a first determination to determine whether the first to tenth connection units 41 to 50 are stuck on or stuck off. If the vehicle is located in an autonomous driving enabled area at the time of startup, the controller 3 does not perform the first determination. This allows the power supply control device 1 to reduce the number of operations of the first to tenth connection units 41 to 50, thereby improving the durability of the first to tenth connection units 41 to 50.

[0054] The backup availability determination also includes a second determination (hereinafter, sometimes referred to as "backup availability determination (b)") that determines the deterioration of the backup power supply 20 by charging and discharging the backup power supply 20. The controller 3 does not perform the second determination.

[0055] For example, when the IG is turned on, the controller 3 controls the first to tenth connection units 41-50 and the DCDC 22 to achieve the state shown in Figure 4, measures the internal resistance of the LiB 21 by charging or discharging the LiB 21, and performs the second determination based on the measured value. If the vehicle's position at the time of startup is within an autonomous driving enabled area, the controller 3 does not perform the second determination. This allows the power supply control device 1 to reduce the number of unnecessary charge / discharge operations of the backup power supply 20, thereby preventing deterioration of the backup power supply 20.

[0056] The backup feasibility determination also includes a third determination (hereinafter, sometimes referred to as "backup feasibility determination (c)") that determines whether power can be supplied from backup power source 20 to the load for a predetermined time. Controller 3 does not perform the third determination.

[0057] For example, the controller 3 controls the first to tenth connection parts 41 to 50 to be in the state shown in Fig. 3, causing power to be supplied from the backup power supply 20 for a predetermined time, and performs the third determination based on whether the voltage of the backup power supply 20 measured by the second voltage sensor 52 after the predetermined time has elapsed is within a normal range. If the vehicle's position at the time of startup is within an autonomous driving enabled area, the controller 3 does not perform the third determination. This allows the power supply control device 1 to reduce the number of unnecessary power feeds from the backup power supply 20, thereby preventing deterioration of the backup power supply 20.

[0058] The backup feasibility determination also includes a fourth determination (hereinafter, may be referred to as "backup feasibility determination (d)") of determining whether the amount of stored power in the backup power source 20 is equal to or greater than a predetermined threshold. The predetermined threshold is, for example, an SOC of the LiB 21 of 80%. For example, the controller 3 performs the fourth determination based on the SOC of the LiB 21 acquired from the backup power source 20. The controller 3 performs the fourth determination even if the vehicle's position at the time of startup is within an autonomous driving travelable area. This allows the power supply control device 1 to reliably perform FOP control when performing FOP control after autonomous driving travel is resumed. Note that the backup feasibility determination does not need to include the first to third determinations, or may include at least one or more of the first to third determinations.

[0059] [4. Processing performed by the controller] Next, a process executed by the controller 3 of the power supply control device 1 will be described with reference to Fig. 5. Fig. 5 is a flowchart showing an example of a process executed by the controller 3 of the power supply control device 1 according to the embodiment.

[0060] The control processes executed by the controller 3 during normal operation, operation during a ground fault, and operation during charging have already been explained with reference to Figures 2 to 4, so explanation of the processes will be omitted here, and only the details of the backup feasibility determination process will be explained.

[0061] When the IG is turned on, the controller 3 acquires the vehicle position from the external device 100 (step S101). Next, the controller 3 determines whether the vehicle position is within an autonomous driving possible area (step S102).

[0062] Specifically, in step S102, the controller 3 determines whether the IG is turned on at the stopping location after switching from automatic driving to manual driving, or at the stopping location during automatic driving, within the automatic driving possible area.

[0063] That is, the controller 3 determines whether the vehicle position is a position where the vehicle will be parked for a relatively short period of time. For this reason, the controller 3 may be configured to determine whether the vehicle position is a location other than the home as an AND condition in step S102. In this case, if the IG is on within an autonomous driving possible area and the vehicle position is other than the home, step S102 becomes Yes.

[0064] If the controller 3 determines that the vehicle position is not within the autonomous driving area (step S102, No), the process proceeds to step S104. If the controller 3 determines that the vehicle position is within the autonomous driving area (step S102, Yes), the controller 3 turns on the first condition flag (step S103). Note that the first condition flag is off when the IG is turned on.

[0065] Next, the controller 3 determines whether the first predetermined time is within a first threshold time (step S104). The first predetermined time is the time elapsed from when the IG is turned off until when it is turned on. If the controller 3 determines that the first predetermined time is not within the first threshold time (step S104, No), the controller 3 proceeds to step S106.

[0066] When the controller 3 determines that the first predetermined time is within the first threshold time (Yes in step S104), it turns on the second condition flag (step S105). Note that the second condition flag is off when the IG is turned on.

[0067] Next, the controller 3 determines whether the second predetermined time is within a second threshold time (step S106). The second predetermined time is the elapsed time from the end of autonomous driving to the turning on of the IG. If the controller 3 determines that the second predetermined time is not within the second threshold time (step S106, No), the controller 3 proceeds to step S108.

[0068] When the controller 3 determines that the second predetermined time is within the second threshold time (Yes in step S106), it turns on the third condition flag (step S107). Note that the third condition flag is off when the IG is turned on.

[0069] Next, the controller 3 determines whether or not a backup feasibility determination omission condition is met (step S108). The backup feasibility determination omission condition is, for example, the first condition flag being on. The backup feasibility determination omission condition may be both the first condition flag and the second condition flag being on. The backup feasibility determination omission condition may be all of the first condition flag, the second condition flag, and the third condition flag being on.

[0070] If the controller 3 determines that the backup availability determination omission condition is met (Yes in step S108), the controller 3 proceeds to step S110. In other words, the controller 3 proceeds to step S110 without performing the backup availability determinations (a), (b), and (c) described below.

[0071] When it is determined that the backup possibility determination omission condition is not satisfied (step S108, No), the controller 3 performs backup possibility determinations (a), (b), and (c) (step S109). The backup possibility determination (a) is a failure determination of the first to fifth connection units 41 to 45 for performing backup.

[0072] The backup feasibility determination (a) may further include a failure determination for the sixth to eighth connection units 46 to 48. If the controller 3 determines that the backup feasibility determination omission condition is not met (No in step S108), the controller 3 may proceed to step S111.

[0073] The backup feasibility determination (b) is a determination of deterioration of the backup power supply 20 due to charging and discharging of the backup power supply 20. The backup feasibility determination (c) is a determination of whether or not power can be supplied from the backup power supply 20 to the first to third FOP loads 102 to 104 for a predetermined time.

[0074] Next, the controller 3 performs a backup feasibility determination (d) (step S110). The backup feasibility determination (d) is a determination of whether the amount of stored power in the backup power supply 20 is equal to or greater than a predetermined threshold. For example, the backup feasibility determination (d) is a determination of whether the SOC of the LiB 21 is equal to or greater than 80%.

[0075] Next, the controller 3 determines whether or not autonomous driving is permitted (step S111). When the controller 3 determines that all of the backup feasibility determinations (a), (b), (c), and (d) are permitted, the controller 3 determines that autonomous driving is permitted.

[0076] If the controller 3 determines that autonomous driving is permitted (step S111, Yes), it turns on the permission flag (step S112). If the controller 3 determines that autonomous driving is not permitted (step S111, No), it turns off the permission flag (step S113). The controller 3 stores the setting content of the permission flag in a non-volatile memory and notifies the external device 100 of the setting content of the permission flag.

[0077] After turning on or off the permission flag, the controller 3 determines whether autonomous driving has started (step S114). The controller 3 acquires a notification indicating whether autonomous driving has started from the external device 100. If the controller 3 determines that autonomous driving has not started (step S114, No), the controller 3 proceeds to step S117.

[0078] When the controller 3 determines that autonomous driving has started (step S114, Yes), it determines whether autonomous driving has ended (step S115). The controller 3 acquires a notification indicating whether autonomous driving has ended from the external device 100. When the controller 3 determines that autonomous driving has not ended (step S115, No), it proceeds to step S117.

[0079] When the controller 3 determines that the autonomous driving has ended (step S115, Yes), it starts a second timer (step S116). The second timer is a timer that measures a second predetermined time that is the elapsed time from the end of the autonomous driving to the turning on of the IG.

[0080] Next, the controller 3 determines whether the IG has been turned off (step S117). The controller 3 is configured to acquire information indicating that the IG has been turned on or off from the vehicle. The controller 3 may also be configured to acquire information indicating that the IG has been turned on or off from the external device 100.

[0081] If the controller 3 determines that the IG is not turned off (step S117, No), the process proceeds to step S110. If the controller 3 determines that the IG is turned off (step S117, Yes), the controller 3 starts a first timer (step S118).

[0082] The first timer is a timer that measures a first predetermined time, which is the time that has elapsed since the IG was turned off until it was turned on. After starting the first timer, the controller 3 ends the processing.

[0083] [5. Notes] As an appendix, the features of the present invention are as follows. (1) A power supply control device including a controller that determines whether or not backup by a backup power supply is possible when starting a vehicle having an autonomous driving function, The controller If the position of the vehicle at the time of the start-up is within an autonomous driving possible area where autonomous driving is permitted, the possibility determination is not performed. Power control device. (2) The controller When the time elapsed from when the ignition switch of the vehicle is turned off to when it is turned on is within a first threshold time, the determination of whether or not the vehicle is ready to be activated is not performed. The power supply control device according to (1) above. (3) The controller The determination of whether or not the autonomous driving is possible is not performed if the elapsed time from the end of the autonomous driving to the turning on of the ignition switch of the vehicle is within a second threshold time. The power supply control device according to (1) or (2). (4) The determination of whether or not the above is possible is a first determination of a failure of the switch for performing the backup; The controller The first determination is not performed. The power supply control device according to any one of (1) to (3). (5) The determination of whether or not the above is possible is a second determination of determining deterioration of the backup power supply by charging and discharging the backup power supply; The controller The second determination is not performed. The power supply control device according to any one of (1) to (4). (6) The determination of whether or not the above is possible is a third determination of whether or not power can be supplied from the backup power source to the load for a predetermined time; The controller The third determination is not made. The power supply control device according to any one of (1) to (5). (7) The determination of whether or not the above is possible is a fourth determination of whether the amount of stored power in the backup power supply is equal to or greater than a predetermined threshold; The controller The fourth determination is performed even if the position of the vehicle at the time of the start is within an autonomous driving possible area. The power supply control device according to any one of (1) to (6). (8) A controller of a power supply control device that determines whether backup by a backup power supply is possible when starting a vehicle having an autonomous driving function, If the position of the vehicle at the time of activation is within an autonomous driving possible area, the possibility determination is not performed. Power control method.

[0084] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0085] 1 Power supply control device 10 Main power supply 11 PbB 12. Generator 3 Controller 20 Backup power supply 21 LiB 41 First connection part 42 Second connection part 43 Third connection part 44 4th connection part 45 5th connection 46 6th Connection 47 7th Junction 48 8th Junction 49 9th Junction 50 10th Junction 51 First voltage sensor 52 Second voltage sensor 100 External device 101 1st general load 102 1st FOP load 103 2nd FOP load 104 3rd FOP load 105 2nd general load 110 1st system 120 2nd system 200 Earth fault

Claims

1. A power supply control device including a controller that determines whether or not backup by a backup power supply is possible when a vehicle having an autonomous driving function is started, The controller If the position of the vehicle at the time of the start-up is in an autonomous driving possible area where autonomous driving is permitted, the possibility determination is not performed. Power control device.

2. The controller When the elapsed time from when the ignition switch of the vehicle is turned off to when it is turned on is within a first threshold time, the possibility determination is not performed. The power supply control device according to claim 1 .

3. The controller If the elapsed time from the end of autonomous driving to the turning on of the ignition switch of the vehicle is within a second threshold time, the possibility determination is not performed. The power supply control device according to claim 1 .

4. The determination of whether or not the above is possible is a first determination of a failure of the switch for performing the backup; The controller The first determination is not performed. The power supply control device according to claim 1 .

5. The determination of whether or not the above is possible is a second determination of determining deterioration of the backup power supply by charging and discharging the backup power supply; The controller The second determination is not performed. The power supply control device according to claim 1 .

6. The determination of whether or not the above is possible is a third determination of whether or not power can be supplied from the backup power source to a load for a predetermined time; The controller The third determination is not performed. The power supply control device according to claim 1 .

7. The determination of whether or not the above is possible is a fourth determination of whether or not the amount of stored power in the backup power supply is equal to or greater than a predetermined threshold; The controller The fourth determination is performed even when the position of the vehicle at the time of the start is within an autonomous driving possible area. The power supply control device according to claim 1 .

8. A controller of a power supply control device that determines whether backup by a backup power supply is possible when starting a vehicle having an autonomous driving function, If the position of the vehicle at the time of the start-up is in an autonomous driving possible area where autonomous driving is permitted, the possibility determination is not performed. Power control method.

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