Power supply control device and power supply control program

Abstract

To provide a power supply control device and a power supply control program which can resolve shortage of electricity that is necessary for back-up control.SOLUTION: A power supply control device according to an embodiment comprises a controller. The controller operated by receiving electricity supply from at least either of a first power supply mounted on a vehicle and a second power supply for backup control that is performed when the first power supply is failed. When the vehicle is in a travelling state in which the vehicle does not require the backup control, the controller stops electricity supply from the second power supply to the controller.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In a power supply control device requiring redundancy, power is supplied to a microcomputer (hereinafter referred to as a "microcomputer") that controls the device from both a main power supply and a backup power supply (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-20102 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a typical power supply control device, if the voltage of the backup power supply is higher than that of the main power supply, power is supplied to the microcomputer from the backup power supply with the higher voltage, which reduces the remaining charge of the backup power supply.As a result, if the main power supply fails, the power supply control device may not have enough power to perform backup control using the backup power supply.

[0005] One aspect of the embodiment has been made in view of the above, and aims to provide a power supply control device and a power supply control program that can resolve the shortage of power required for backup control. [Means for solving the problem]

[0006] According to one embodiment, a power supply control device includes a controller. The controller operates by receiving power from at least one of a first power supply mounted on a vehicle and a second power supply for backup control in case the first power supply fails. When the vehicle is in a driving state that does not require the backup control, the controller stops the power supply from the second power supply to the controller. [Effects of the Invention]

[0007] The power supply control device according to the embodiment stops the supply of power from the second power source to the controller when the vehicle is in a driving state that does not require backup control, thereby preventing the remaining charge of the second power source from decreasing. This allows the power supply control device according to the embodiment to resolve a shortage of power required for backup control. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of the configuration of a power supply control device according to the first embodiment. [Figure 2] FIG. 2 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Figure 3] FIG. 3 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Figure 5] FIG. 5 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing an example of processing executed by the controller according to the first embodiment. [Figure 7] FIG. 7 is an explanatory diagram illustrating an example of the configuration of a power supply control device according to the second embodiment. [Figure 8] FIG. 8 is an explanatory diagram showing the configuration of a power supply circuit according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of a power supply control device and a power supply control program will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below. The following description will be given using an example of a power supply control device that is installed in a vehicle with an autonomous driving function and supplies power to a load, but the power supply control device according to the embodiment may also be installed in a vehicle that does not have an autonomous driving function. Furthermore, the power supply control device according to the embodiment may also be installed in something other than a vehicle.

[0010] In addition, although the following description will be given of a case where the vehicle in which the power supply control device is installed is an electric vehicle or a hybrid vehicle, the vehicle in which the power supply control device is installed may also be an engine vehicle that runs on an internal combustion engine.

[0011] 1. First Embodiment 1-1. Power supply control device configuration Fig. 1 is an explanatory diagram showing an example of the configuration of a power supply control device 1 according to a first embodiment. As shown in Fig. 1, the power supply control device 1 is connected to an automatic driving control device 100, a first power supply 10, a DC / DC converter 11 (hereinafter referred to as "DCDC 11"), a second power supply 20, a first load 101, a second load 102, and a third load 103. Here, a case will be described in which three loads are connected to the power supply control device 1, but the number of loads connected to the power supply control device 1 is not limited to three as long as it is two or more.

[0012] The first power source 10 is, for example, a lead battery. However, the first power source 10 may be any secondary battery other than a lead battery. The first power source 10 is a main power source that mainly supplies power to the first to third loads 101 to 103, etc.

[0013] The DCDC 11 is connected to a high-voltage battery 12. The high-voltage battery 12 is a vehicle drive battery that supplies power to a motor that runs the vehicle. The high-voltage battery 12 is, for example, a lithium-ion battery. The DCDC 11 steps down the voltage of the high-voltage battery 12 to charge the first power source 10, charge the second power source 20, and supply power to the first to third loads 101 to 103.

[0014] When the DCDC 11 is mounted on an engine vehicle, it is connected to an alternator that converts regenerative energy of the vehicle into electric power to generate electricity, and transforms and outputs the input voltage input from the generator.

[0015] The second power source 20 is, for example, a lithium ion battery. The second power source 20 is a backup power source in case the first power source 10 is unable to supply power. Note that the second power source 20 may be any secondary battery other than a lithium ion battery.

[0016] The first load 101 includes devices used when autonomous driving is performed and devices not involved in the execution of autonomous driving. Devices used when autonomous driving is performed include, for example, an electric steering system, an electric braking system, radar, an in-vehicle camera, exterior lamps (hazard lamps, headlights, brake lights, etc.), interior lamps (warning lights, etc.), etc. Devices not involved in the execution of autonomous driving include, for example, an air conditioner, power windows, an A / V (audio / video) system, an outlet inside the vehicle, an outlet outside the vehicle, etc.

[0017] The second and third loads 102-103 include devices related to the execution of autonomous driving. The second load 102 includes, for example, an electric steering device, an electric braking device, an on-board camera, etc. The third load 103 includes, for example, a radar and exterior lamps (hazard lamps, headlights, brake lights, etc.).

[0018] The power supply control device 1 is a device that outputs and supplies power input from a first power supply 10 or a second power supply 20 to first to third loads 101 to 103. The power supply control device 1 includes a first power supply line L1, a second power supply line L2, a common power supply line L3, load power supply lines L4 to L6, first to sixth switches 41 to 46, a first voltage sensor 51, a second voltage sensor 52, a controller 3, a power supply circuit 31, and a DCDC 32.

[0019] The first power supply line L1 is a power supply line that supplies power from the first power source 10 to the first to third loads 101 to 103. The second power supply line L2 is a power supply line that supplies power from the second power source 20 to the first to third loads 101 to 103. The common power supply line L3 is a power supply line that connects the first power supply line L1 and the second power supply line L2.

[0020] The load feed line L4 is a feed line that feeds power to the first load 101. The load feed line L5 is a feed line that feeds power to the second load 102. The load feed line L6 is a feed line that feeds power to the third load 103.

[0021] The first switch 41 is a switch that can establish and break conduction between the first power source 10 and the first power supply line L1. The second switch 42 is a switch that can establish and break conduction between the second power source 20 and the second power supply line L2. The third switch 43 is a switch that can establish and break conduction between the load power supply line L4 and the first power supply line L1.

[0022] The fourth switch 44 is a switch that can establish and break conduction between the common power supply line L3 and the load power supply line L5. The fifth switch 45 is a switch that can establish and break conduction between the second power supply line L2 and the load power supply line L6. The sixth switch 46 is a switch that can establish and break conduction between the second power supply line L2 and the power supply circuit 31.

[0023] The first voltage sensor 51 detects the voltage of the first power supply line L1 and outputs the detection result to the controller 3. The second voltage sensor 52 detects the voltage of the second power supply line L2 and outputs the detection result to the controller 3.

[0024] The DCDC 32 is provided on the second power supply line L2. For example, when charging the second power supply 20, the DCDC 32 steps down the voltage input from the first power supply 10 and outputs the voltage to the second power supply 20. Furthermore, when the first power supply 10 fails, the DCDC 32 supplies the power input from the second power supply 20 to the first to third loads 101 to 103.

[0025] The power supply circuit 31 is connected to the second power supply line L2 via the sixth switch 46 and is also connected to the controller 3. The power supply circuit 31 is a regulator circuit that transforms the voltage input from the first power supply 10 via a diode 61 or the voltage input from the second power supply 20 via a diode 62 to a drive voltage for the controller 3 and outputs the voltage to the controller 3.

[0026] The controller 3 includes a microcomputer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and various circuits. The controller 3 controls the conduction and interruption (on / off) of the first to sixth switches 41 to 46 and the operation of the DCDC 32 by the CPU executing a power control program stored in the ROM using the RAM as a work area.

[0027] The power supply control program may be stored in a storage device via an external communication line, etc. Also, the controller 3 may be configured partially or entirely with hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0028] The controller 3 operates on power input from the first power source 10 via the power supply circuit 31, or on power input from the second power source 20 via the power supply circuit 31. However, as described above, the second power source 20 is a backup power source in case the first power source 10 is unable to supply power. For this reason, it is desirable for the controller 3 to use as little power as possible from the second power source 20 except when backup control is required.

[0029] Therefore, when the vehicle is in a driving state that does not require backup control, the controller 3 stops the supply of power from the second power source 20 to the controller 3. This allows the power supply control device 1 to prevent the remaining charge of the second power source 20 from decreasing when the vehicle is in a driving state that does not require backup control, thereby eliminating the shortage of power required for backup control.

[0030] <1-2. Example of power supply control device operation> Next, an example of operation of the power supply control device 1 according to the first embodiment will be described with reference to Figures 2 to 5. Figures 2 to 5 are explanatory diagrams showing an example of operation of the power supply control device 1 according to the first embodiment.

[0031] In the case of non-automatic driving (manual driving), the driver of the vehicle equipped with the power supply control device 1 can manually drive the vehicle to a safe place and stop it, even if the first power source 10 fails. Therefore, in the case of non-automatic driving, the power supply control device 1 does not require backup control.

[0032] Therefore, as shown in FIG. 2, the controller 3 keeps all of the first to fifth switches 41 to 45 conductive until a notification indicating that autonomous driving will start is input from the autonomous driving control device 100, or when a notification indicating that the vehicle is in a non-autonomous driving state is input, that is, when the vehicle is in a non-autonomous driving state. Then, the controller 3 turns off the sixth switch 46 provided on the power supply path from the second power source 20 to the controller 3. Therefore, the power supply circuit 31 steps down the voltage input to the power supply circuit 31 via the first power supply line L1 and supplies the voltage to the controller 3. At this time, the controller 3 stops the operation of the DCDC 32. Therefore, power is not supplied from the second power source 20 to the first to third loads 101 to 103.

[0033] In this way, when the vehicle is in a non-autonomous driving state, the controller 3 stops the power supply from the second power supply 20 to the controller 3. This allows the power supply control device 1 to reduce the amount of discharge from the second power supply 20 while the vehicle is in a non-autonomous driving state, thereby eliminating the shortage of power required for backup control. Furthermore, the controller 3 can stop the power supply from the second power supply 20 to the controller 3 simply by performing the simple process of turning off the sixth switch 46.

[0034] Furthermore, in a typical power supply control device equipped with a redundant power supply, when the voltage of the second power supply 20 is higher than the voltage of the first power supply 10, power is supplied to the controller 3 from the second power supply 20 with the higher voltage, but this may result in a shortage of power required for backup control.

[0035] Therefore, when the vehicle is in the non-autonomous driving state, the controller 3 of the embodiment refers to the detection results of the first and second voltage sensors 51, 52, and if the voltage of the second power source 20 is higher than the voltage of the first power source 10, stops the power supply from the second power source 20 to the controller 3.

[0036] In other words, when the vehicle is in the non-autonomous driving state, the controller 3 turns off the sixth switch 46 if the voltage of the second power source 20 is higher than the voltage of the first power source 10. This allows the power supply control device 1 to reduce the amount of discharge of the second power source 20 even if the voltage of the second power source 20 is higher than the voltage of the first power source 10, thereby eliminating the shortage of power required for backup control.

[0037] Furthermore, while a notification indicating that the vehicle is in automatic driving is received from the automatic driving control device 100, that is, when the vehicle is in automatic driving state, the controller 3 turns on all of the first to sixth switches 41 to 46 as shown in Fig. 3. Therefore, the power supply circuit 31 steps down the voltage input from the first power source 10 via the first power supply line L1 and the voltage input from the second power source 20 via the second power supply line L2, and outputs the resulting voltages to the controller 3.

[0038] In this way, when the vehicle is in an autonomous driving state, the power supply control device 1 supplies power to the controller 3 from the first power source 10 and the second power source 20. As a result, even if the first power source 10 fails while the vehicle is in an autonomous driving state, the power supply control device 1 can continue to supply power to the controller 3 from the second power source 20 without causing a momentary power interruption to the controller 3.

[0039] Furthermore, the controller 3 monitors whether or not a ground fault has occurred at the connection between the power supply control device 1 and the first power supply 10, the second power supply 20, and the first to third loads 101 to 103 while the vehicle is in an automatic driving state.

[0040] In the power supply control device 1, when a ground fault occurs at the connection between the power supply control device 1, the first power source 10, and the first to third loads 101 to 103, the voltage detected by the first voltage sensor 51 drops below the ground fault threshold. In addition, in the power supply control device 1, when a ground fault occurs at the connection between the power supply control device 1 and the second power source 20, the voltage detected by the second voltage sensor 52 drops below the ground fault threshold.

[0041] Therefore, the controller 3 detects the occurrence of a ground fault by monitoring the detection results of the first voltage sensor 51 and the second voltage sensor 52. When the controller 3 detects the occurrence of a ground fault, it identifies the location of the ground fault.

[0042] When the voltage detected by the first voltage sensor 51 becomes equal to or lower than the ground fault threshold, the controller 3 performs control to turn off only one of the first and third to fifth switches 41, 43 to 45, but this control is also performed for all of the first and third to fifth switches 41, 43 to 45.

[0043] If the switch corresponding to the connection where the ground fault occurs is closed, the voltage detected by the first voltage sensor 51 returns to a normal value higher than the ground fault threshold. Therefore, if the voltage detected by the first voltage sensor 51 becomes higher than the ground fault threshold after the switch is closed, the controller 3 determines that a ground fault has occurred at the connection corresponding to the closed switch.

[0044] For example, as shown in FIG. 4, when a ground fault 200 occurs at the connection between the power supply control device 1 and the first load 101, the controller 3 turns off only the third switch 43 among the first, third to fifth switches 41, 43 to 45, and keeps the other switches in a conducting state.

[0045] This allows the controller 3 to supply power from the first power source 10 and the second power source 20 to the controller 3. Furthermore, the controller 3 can supply power from the first power source 10 to the second load 102 and the third load 103. As a result, the automatic driving control device 100 can operate the second load 102 and the third load 103 to cause the vehicle to evacuate and stop in a safe place.

[0046] 5, when a ground fault 200 occurs at the connection between the power supply control device 1 and the first power supply 10, the controller 3 turns off only the first switch 41 among the first, third to fifth switches 41, 43 to 45, and keeps the other switches in a conducting state. Furthermore, the controller 3 activates the DCDC 32.

[0047] As a result, the controller 3 can supply power from the second power source 20 to the controller 3, and power can be supplied from the second power source 20 to the first to third loads 101 to 103 via the DCDC 32. As a result, the automatic driving control device 100 can operate the first to third loads 101 to 103 to cause the vehicle to evacuate and stop in a safe place.

[0048] In addition, when a ground fault occurs in the connection between the power supply control device 1 and the second power supply 20, the controller 3 turns off only the second switch 42 among the first to sixth switches 41 to 46, and keeps the other switches in a conducting state.

[0049] In this case, the controller 3 can supply power from the first power source 10 to the controller 3 and the first to third loads 101 to 103. Therefore, the automatic driving control device 100 can operate the first to third loads 101 to 103 to cause the vehicle to evacuate and stop in a safe place.

[0050] <1-3. Example of power supply control device operation> Next, an example of processing executed by the controller 3 according to the first embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing an example of processing executed by the controller 3 according to the first embodiment.

[0051] While the ignition switch of the vehicle is turned on, the controller 3 repeatedly executes the process shown in Fig. 6. When the ignition switch is turned on, the controller 3 determines whether or not the vehicle is in a non-automated driving state, as shown in Fig. 6 (step S101).

[0052] The controller 3 determines whether or not the vehicle is in a non-autonomous driving state based on the notification of the autonomous driving state (autonomous driving state or non-autonomous driving state) notified from the autonomous driving control device 100. If the controller 3 determines that the vehicle is not in a non-autonomous driving state (No in step S101), that is, if the controller 3 determines that the vehicle is in an autonomous driving state, the controller 3 turns on the first to sixth switches 41 to 46 (step S105) and proceeds to step S106.

[0053] Furthermore, if the controller 3 determines that the vehicle is in a non-automatic driving state (step S101, Yes), that is, if the controller 3 determines that the vehicle is in a manual driving state, it determines whether or not the vehicle is set to be powered from a power source with a higher voltage (step S102).

[0054] If the controller 3 determines that the setting is not to supply power from a power source with a higher voltage (step S102, No), the process proceeds to step S104. If the controller 3 determines that the setting is to supply power from a power source with a higher voltage (step S102, Yes), the controller 3 determines whether the voltage of the second power source 20 is higher than the voltage of the first power source 10 (step S103).

[0055] If the controller 3 determines that the voltage of the second power source 20 is not higher than the voltage of the first power source 10 (step S103, No), that is, if it determines that the voltage of the second power source 20 is lower than or equal to the voltage of the first power source 10, it proceeds to step S105.

[0056] In this case, the second switch 42 is turned on, but because the setting is such that power is supplied from a power source with a higher voltage, and the voltage of the second power source 20 is equal to or lower than the voltage of the first power source 10, no power is supplied from the second power source 20 to the controller 3. Therefore, the controller 3 can suppress the discharge of the second power source 20.

[0057] Furthermore, when the controller 3 determines that the voltage of the second power supply 20 is higher than the voltage of the first power supply 10 (Yes in step S103), it turns on the first to fifth switches 41 to 45 and turns off the sixth switch 46 (step S104). This allows the controller 3 to stop the power supply from the second power supply 20 to the controller 3, thereby suppressing discharge of the second power supply 20.

[0058] Next, the controller 3 determines whether or not a ground fault has been detected (step S106). The controller 3 detects the occurrence of a ground fault based on the detection results of the first voltage sensor 51 and the second voltage sensor 52.

[0059] If the controller 3 does not detect the occurrence of a ground fault (step S106, No), it ends the process and restarts the process from step S101. If the controller 3 detects a ground fault (step S106, Yes), it performs a ground fault location identification process (step S107).

[0060] In the ground fault location identification process, the controller 3 turns off only one of the first to sixth switches 41 to 46 and determines whether the voltage detected by the first voltage sensor 51 or the second voltage sensor 52 returns to a normal value higher than the ground fault threshold.

[0061] The controller 3 executes this ground fault location identification process for all of the first to sixth switches 41 to 46. Then, when the voltage detected by the first voltage sensor 51 or the second voltage sensor 52 returns to a normal value higher than the ground fault threshold value after turning off the switch, the controller 3 identifies the connection part corresponding to that switch as the ground fault location. Next, the controller 3 turns off the switch at the identified ground fault location (step S108) and ends the process.

[0062] 2. Second Embodiment 2-1. Power supply control device configuration Fig. 7 is an explanatory diagram showing an example of the configuration of a power supply control device 1A according to the second embodiment. Fig. 8 is an explanatory diagram showing the configuration of a power supply circuit 31A according to the second embodiment.

[0063] 7, the power supply control device 1A differs from the power supply control device 1 according to the first embodiment in that it does not include a sixth switch 46 (see FIG. 1) and in that the configuration of the power supply circuit 31A is different from that of the power supply control device 1 according to the first embodiment, but the other configurations are the same as those of the first embodiment. For this reason, the components of the power supply control device 1A that are the same as the components of the power supply control device 1 according to the first embodiment are assigned the same reference numerals as in the first embodiment, and redundant explanations will be omitted.

[0064] As shown in FIG. 8, the power supply circuit 31A includes a seventh switch 47, a transistor TR, an inductor L, a capacitor C, a comparator CMP, a reference voltage source B, a diode D, and a power supply control circuit 33.

[0065] One terminal of the seventh switch 47 is connected to the second power supply 20 via a diode 61, and the other terminal is connected to the drain of the transistor TR. The drain of the transistor TR is also connected to the first power supply 10 via a diode 62.

[0066] The transistor TR has a gate connected to the power supply control circuit 33 and a source connected to the controller 3 via the inductor L. A capacitor C is connected between the ground and a connection line connecting the inductor L and the controller 3. The inductor L and the capacitor C form an LC filter F.

[0067] The cathode of the diode D is connected to the source of the transistor TR, and the anode is connected to ground. The output of the LC filter F is connected to the positive input terminal of the comparator CMP. A reference voltage is input to the negative input terminal of the comparator CMP from a reference voltage source B. The reference voltage is the operating voltage of the controller 3. The output terminal of the comparator CMP is connected to the power supply control circuit 33.

[0068] The comparator CMP outputs a High output signal to the power supply control circuit 33 when the output voltage of the LC filter F, that is, the voltage output from the power supply circuit 31A to the controller 3, is higher than the reference voltage. The comparator CMP outputs a Low output signal to the power supply control circuit 33 when the output voltage of the LC filter F, that is, the voltage output from the power supply circuit 31A to the controller 3, is lower than the reference voltage.

[0069] The power supply control circuit 33 applies a negative voltage to the gate of the transistor TR while a high output signal is being input from the comparator CMP, thereby cutting off the connection between the drain and source of the transistor TR.

[0070] Furthermore, the comparator CMP applies a positive voltage to the gate of the transistor TR while a low output signal is being input from the comparator CMP, thereby causing conduction between the drain and source of the transistor TR. This allows the power supply control circuit 33 to transform the voltage of the first power supply 10 or the second power supply 20 to the operating voltage of the controller 3 and output it to the controller 3.

[0071] Furthermore, the power supply control circuit 33 controls the conduction and interruption (on / off) of the seventh switch 47 in response to a control signal input from the controller 3. When a notification indicating that non-automatic driving is in progress is input from the automatic driving control device 100, the controller 3 outputs a control signal to the power supply control circuit 33 to cause the seventh switch 47 to be interrupted. When a notification indicating that automatic driving is in progress is input from the automatic driving control device 100, the controller 3 outputs a control signal to the power supply control circuit 33 to cause the seventh switch 47 to be conductive.

[0072] When a control signal for turning off the seventh switch 47 is input from the controller 3, the power supply control circuit 33 turns off the seventh switch 47. In other words, the power supply control circuit 33 stops the supply of power from the second power supply 20 to the controller 3. This allows the power supply control device 1A to suppress discharge of the second power supply 20 when the vehicle is in a non-autonomous driving state in which backup control is not required.

[0073] Furthermore, the power supply control circuit 33 turns on the seventh switch 47 when a control signal for turning on the seventh switch 47 is input from the controller 3. In other words, the power supply control circuit 33 supplies power from the first power supply 10 and the second power supply 20 to the controller 3 when the vehicle is in an autonomous driving state requiring backup control.

[0074] The power supply control device 1 can continue to supply power from the second power supply 20 to the controller 3 without causing a momentary interruption in the power supply to the controller 3, even if, for example, the first power supply 10 fails while the vehicle is in an autonomous driving state.

[0075] Thus, the power supply control device 1A includes a power supply circuit 31A that selects between the first power supply 10 and the second power supply 20 as the power supply to supply power to the controller 3. When the vehicle is in a running state that does not require backup control, the controller 3 instructs the power supply circuit 31A to select the first power supply 10.

[0076] As a result, when the vehicle is in a traveling state in which backup control is not required, the power supply control device 1A can eliminate the shortage of power required for backup control by suppressing discharge of the second power supply 20.

[0077] The process executed by the controller 3 according to the second embodiment can control the first to fifth switches 41 to 45 and the seventh switch 47 by replacing the sixth switch 46 with the seventh switch 47 in steps S104 and S105 of the flowchart shown in FIG.

[0078] In the above embodiment, the vehicle is in a non-autonomous driving state when backup control is not required. However, the driving state when backup control is not required is not limited to this. For example, the driving state when backup control is not required may be a period when the vehicle is in an autonomous driving state and no ground fault is detected. In this case, if the controller 3 detects a ground fault at the connection between the power supply control device 1, 1A and the first power supply 10, the controller 3 causes power to be supplied from the second power supply 20 to the controller 3.

[0079] Furthermore, in the above-described embodiment, the power supply control devices 1, 1A are described as examples that do not include an isolator, which is an inter-system switch that can connect and disconnect the common power supply line L3, but the power supply control devices 1, 1A may also be configured to include an isolator.

[0080] In this case, the only difference is the procedure for identifying the location of the ground fault, and other controls are the same as those of the power supply control devices 1 and 1 A. Note that if the power supply control devices 1 and 1 A are provided with an isolator, the first switch 41 becomes unnecessary.

[0081] When the power supply control device 1, 1A equipped with an isolator detects the occurrence of a ground fault, it shuts off the isolator. After that, if the voltage detected by the first voltage sensor 51 returns to a normal value and the voltage detected by the second voltage sensor 52 is equal to or lower than the ground fault threshold value, the power supply control device 1, 1A determines that a ground fault has occurred on the second power supply line L2 side.

[0082] Furthermore, after detecting a ground fault and shutting off the isolator, if the voltage detected by the second voltage sensor 52 returns to a normal value and the voltage detected by the first voltage sensor 51 is below the ground fault threshold, the power supply control device 1, 1A determines that a ground fault has occurred on the first power supply line L1 side.

[0083] 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]

[0084] 1.1A Power Supply Control Device 3 Controller 31,31A power supply circuit 33 Power supply control circuit 10 1st power supply 11,32 DCDC 12 High-voltage battery 20 2nd power supply 41~47 1st switch~7th switch 51 First voltage sensor 52 Second voltage sensor 100 Automatic driving control device 101~103 1st load~3rd load L1 First power supply line L2 Second power supply line L3 common power supply line L4~L6 Load power supply lines B Reference voltage source C capacitor CMP Comparator F LC filter L inductor TR transistor

Claims

1. a controller that operates by receiving power from at least one of a first power source mounted on the vehicle and a second power source for backup control in case the first power source fails; The controller When the vehicle is in a running state that does not require the backup control, the power supply from the second power source to the controller is stopped. Power control device.

2. The driving state in which the backup control is not required is a non-automated driving state. The power supply control device according to claim 1 .

3. The controller When the vehicle is in the non-autonomous driving state, if the voltage of the second power supply is higher than the voltage of the first power supply, the power supply from the second power supply to the controller is stopped. The power supply control device according to claim 2 .

4. The controller When the vehicle is in an autonomous driving state, power is supplied to the controller from the first power source and the second power source. The power supply control device according to claim 2 .

5. a switch provided in a power supply path from the second power source to the controller; The controller When the power supply from the second power source to the controller is stopped, the switch is turned off. The power supply control device according to claim 1 .

6. a power supply circuit that selects a power supply to supply power to the controller from the first power supply and the second power supply; The controller When the vehicle is in a running state that does not require the backup control, the power supply circuit is instructed to select the first power supply. The power supply control device according to claim 1 .

7. A controller that operates by receiving power supply from at least one of a first power source mounted on a vehicle and a second power source for backup control in case the first power source fails is made to execute a procedure for stopping power supply from the second power source to the controller when the vehicle is in a running state that does not require the backup control. Power control program.

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