Control device and program

Abstract

In a power supply system, an electric load (21) and a capacitor (22) are connected to a battery (11) via an electric pathway (12, 13). Meanwhile, a power supply switch (15, 16) is connected to the electric pathway, and a serial-connection body constituted of a pre-charge switch (17) and a current limiting resistor (18) is connected in parallel to the power supply switch. In response to a system startup request, a control device (30) pre-charges the capacitor by energizing the pre-charge switch before energizing the power supply switch. The control device comprises: an abnormality determination unit that determines whether an energization abnormality, in which the energization continues via the pre-charge switch even after the pre-charge of the capacitor has been completed after the pre-charge switch has been turned ON, has occurred; and a switch control unit that, if it is determined that the energization abnormality has occurred, turns OFF the pre-charge switch, and does not permit the pre-charge switch to be turned ON until a prescribed period of time elapses.

Description

Cross-reference to Related Applications

[0001] This application is based on Japanese Application No. 2023-007291 filed on January 20, 2023, the contents of which are incorporated herein by reference.

Technical Field

[0002] The present disclosure relates to a control device and a program for a power supply system.

Background Art

[0003] In a power supply system, a main relay is provided in an electrical path connected to a battery, and a series connection body of a pre-charge relay and a current limiting resistor is connected in parallel to the main relay. For example, in Patent Document 1, in a power control device that controls the on / off of each relay in response to a power connection request, if the elapsed time since the pre-charge relay was turned off is shorter than a predetermined time, even when a power cut-off request is received, control is performed so that the main relay is maintained in the on state without being turned off. Further, Patent Document 1 discloses a technique for forcibly turning off each relay when an abnormality in a battery, a load, a main relay, or a pre-charge relay is detected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] Incidentally, in a power supply system, while the precharge relay is ON, it is conceivable that an abnormal current flow may occur due to electrical equipment failure or a short circuit in the electrical path, causing current to continue flowing even after precharging is complete. In this case, the technology described in Patent Document 1 only shuts off all relays when an abnormality is detected, and does not specify any processing for limiting precharging in response to subsequent system startup requests (power connection requests). Therefore, there is a concern that precharging may occur again in response to the next system startup request, even though an abnormal current flow has occurred, leading to overheating of the current limiting resistor.

[0006] This disclosure has been made in view of the above-mentioned problems, and its purpose is to provide a control device and program that can take appropriate action when an abnormality in power supply occurs after precharging.

[0007] To address the above issues, this disclosure provides: This is applied to a power supply system in which an electrical load and a capacitor are connected to a battery via an electrical path, a power switch is connected to the same electrical path, and a series connection of a precharge switch and a current limiting resistor is connected in parallel to the power switch. A control device that, in response to a system startup request, causes power to be supplied through the precharge switch prior to power supply through the power switch, thereby precharging the capacitor, An abnormality determination unit determines whether or not an abnormality in current supply has occurred in which current continues to be supplied through the precharge switch even after the precharge of the capacitor has been completed after the precharge switch has been turned on, If it is determined that the aforementioned power supply abnormality has occurred, the switch control unit turns off the precharge switch and does not allow the precharge switch to be turned on until a predetermined period of time has elapsed, It is equipped with.

[0008] In the power supply system, it is possible that a current flow abnormality may occur where current continues to flow even after precharging is complete, while the precharge switch is in the ON position. Considering this, the system determines whether a current flow abnormality has occurred after the precharge switch is turned ON. If a current flow abnormality is detected, the precharge switch is turned OFF, and it is not permitted to turn the precharge switch ON until a predetermined period has elapsed. This prevents overheating of the current limiting resistor in the event of a current flow abnormality. As a result, appropriate measures can be taken if a current flow abnormality occurs after precharging. [Brief explanation of the drawing]

[0009] The purposes and other objectives, features and benefits of this disclosure will be further clarified by the detailed description below, with reference to the attached drawings. Those drawings are: [Figure 1] Figure 1 is a schematic diagram of the power supply system. [Figure 2] Figure 2 is a flowchart showing the relay control process. [Figure 3] Figure 3 is a timing chart to explain relay control in more detail. [Figure 4] Figure 4 is a schematic diagram of the power supply system in the second embodiment. [Figure 5] Figure 5 is a flowchart showing the relay control processing procedure in the second embodiment. [Figure 6] Figure 6 is a time chart to more specifically explain the relay control in the second embodiment. [Figure 7] Figure 7 shows the relationship between the integrated current value and the standby time TB. [Modes for carrying out the invention]

[0010] (First Embodiment) Hereinafter, embodiments of the power supply system according to this disclosure will be described with reference to the drawings. In the following embodiments and modifications, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the descriptions of such parts will be referred to accordingly.

[0011] This embodiment realizes a high-voltage power supply system that can be installed in electric vehicles such as electric cars and hybrid cars, and is configured to drive a high-voltage electrical load by supplying power from a high-voltage power source. Figure 1 shows a schematic configuration of the power supply system in this embodiment.

[0012] In Figure 1, the battery 11, which is a high-voltage power source, has positive electrode path 12 and negative electrode path 13 connected to it, and a high-voltage electrical load 21 is connected to each of these paths 12 and 13. The battery 11 is, for example, a high-voltage lithium-ion battery with a storage voltage of several hundred volts. The high-voltage electrical load 21 includes an inverter that drives a vehicle motor (not shown).

[0013] Between the battery 11 and the high-voltage electrical load 21, a main relay 15 is connected to the positive terminal path 12, and a ground relay 16 is connected to the negative terminal path 13. In addition, a series connection of a pre-charge relay 17 and a current-limiting resistor 18 is connected in parallel to the main relay 15 in the positive terminal path 12. In this embodiment, the main relay 15 corresponds to a "power switch," and the pre-charge relay 17 corresponds to a "pre-charge switch."

[0014] Furthermore, a capacitor 22 is connected in parallel with the high-voltage electrical load 21 between the positive electrode path 12 and the negative electrode path 13.

[0015] This power supply system is provided with a control device 30 having a microcomputer, various memories, and the like. An activation signal is input to the control device 30 from an activation switch 31 for activating the power supply system, and a current signal is input from a current sensor 32 provided, for example, in the negative electrode path 13. The activation switch 31 is a vehicle start switch (start switch) operated by the user to start the vehicle, or an associated switch that is turned on in accordance with the on operation of the vehicle start switch. The activation signal (on signal) input from the activation switch 31 to the control device 30 corresponds to a "system activation request". Although not shown, battery information indicating the voltage, temperature, etc. of the battery 11, operation state information indicating the operation state of the driving motor which is the vehicle driving source, etc. may be appropriately input to the control device 30 as input information.

[0016] The control device 30 has a relay control function for controlling the on / off of the main relay 15, the ground relay 16, and the precharge relay 17, and a load control function for controlling the operation of the high-voltage electrical load 21.

[0017] When the control device 30 receives an activation signal (system activation request) output from the activation switch 31, it turns on the ground relay 16 and the precharge relay 17 prior to turning on the main relay 15. As a result, current flows from the battery 11 through the precharge relay 17 and the current limiting resistor 18, and the capacitor 22 is precharged. In other words, prior to energization through the main relay 15, energization through the precharge relay 17 is performed to charge the capacitor 22. Further, the control device 30 turns on the main relay 15 and turns off the precharge relay 17 after a lapse of a predetermined time TA from when the precharge relay 17 is turned on. Thereby, power supply from the battery 11 side to the high-voltage electrical load 21 side becomes possible.

[0018] Here, when pre-charging is performed, energization is carried out through the current limiting resistor 18, and the current limiting resistor 18 is heated according to the amount of current. In this case, for example, if an abnormal energization occurs where energization continues through the pre-charge relay 17 even after pre-charging is completed due to a short circuit abnormality on the high-voltage electrical load 21 side, there is a concern that the current limiting resistor 18 will be overheated.

[0019] Therefore, in this embodiment, the control device 30 includes an abnormality determination unit that determines that an abnormal energization has occurred where energization continues through the pre-charge relay 17 even after the charging of the capacitor 22 is completed after the pre-charge relay 17 is turned on, and a switch control unit that turns off the pre-charge relay 17 and does not permit the pre-charge relay 17 to be turned on until a predetermined period has elapsed when it is determined that an abnormal energization has occurred. In this embodiment, when an abnormal energization occurs, the predetermined period is set until the standby time TB set in the timer elapses, and the pre-charge relay 17 is not permitted to be turned on. After the standby time TB has elapsed, the pre-charge relay 17 is permitted to be turned on.

[0020] FIG. 2 is a flowchart showing the processing procedure of relay control, and this processing is performed by the control device 30 at a predetermined cycle after the start switch 31 is turned on.

[0021] In FIG. 2, in step S11, it is determined whether the standby time TB set in the timer remains, in other words, whether the standby time TB is greater than 0. This standby time TB is the time set when an abnormal energization has occurred, and the process proceeds to the subsequent step S12 on the condition that the standby time TB is 0. In step S12, the main relay 15 is turned off, and the ground relay 16 and the pre-charge relay 17 are turned on. Thereby, pre-charging is started.

[0022] Subsequently, in step S13, the system waits for a predetermined time TA to elapse from the time the precharge relay 17 is turned on. In the following step S14, based on the detection value of the current sensor 32, it is determined whether the current Ir flowing through the current limiting resistor 18 is less than a predetermined threshold TH1. In this embodiment, the current Ir at the time the predetermined time TA has elapsed is the detection information for the current flowing through the current limiting resistor 18 and corresponds to a parameter indicating the magnitude of the current supplied during the precharge energization period. The predetermined time TA is determined based on the time required to complete the precharge of the capacitor 22, and at the time the predetermined time TA has elapsed, the current Ir should ideally be 0 or close to 0. In other words, if the power supply system is functioning correctly, the current Ir will be less than the threshold TH1, and step S14 will be affirmed, allowing the system to proceed to step S15.

[0023] In step S15, the main relay 15 and the ground relay 16 are turned ON, and the precharge relay 17 is turned OFF. This enables power supply from the battery 11 to the high-voltage electrical load 21.

[0024] Subsequently, in step S16, it is determined whether or not the start switch 31 has been turned off. If the start switch 31 has been turned off, the process proceeds to step S17, where the main relay 15, ground relay 16, and precharge relay 17 are all turned off.

[0025] On the other hand, if it is determined in step S14 that the current Ir is greater than or equal to the threshold TH1, the process proceeds to step S18. In step S18, the main relay 15, ground relay 16, and precharge relay 17 are all turned off. In step S19, the standby time TB is set on the timer. The standby time TB should be, for example, several tens of seconds to several minutes. Also in step S19, the user should be notified of the abnormality. This notification should be made continuously until the standby time TB has elapsed. The notification should be made via an in-vehicle audio device or display device, or by sending a notification to a portable device carried by the user.

[0026] After the standby time TB is set, step S11 is negated for the period after the start switch 31 is turned on until the standby time TB has elapsed. As a result, power is not supplied via the precharge relay 17 until the standby time TB has elapsed, that is, until the current limiting resistor 18 has finished cooling.

[0027] Figure 3 is a time chart to explain the relay control described above in more detail. Figure 3 assumes a situation where a power supply abnormality occurs in the power supply system, but for comparative explanation, the current change under normal conditions is shown with a dashed line. Note that when the start switch 31 is in the off state, relays 15 to 17 are all in the off state as the initial state.

[0028] In Figure 3, at timing t1, the ground relay 16 and precharge relay 17 are turned on when the start switch 31 is turned on, and precharging begins. At this time, the current Ir rises sharply at the beginning of precharging, and as the capacitor 22 charges, the current Ir gradually decreases. If the system is functioning normally, as shown by the dashed line, the current Ir becomes 0 before the predetermined time TA has elapsed due to the completion of precharging. Subsequently, although not shown, at timing t2, the main relay 15 and ground relay 16 are turned on, and the precharge relay 17 is turned off. This enables power supply from the battery 11 to the high-voltage electrical load 21.

[0029] On the other hand, if an abnormality occurs in the power supply system, the current Ir will be larger than when the system is functioning normally from timing t1 onward, and the current Ir will continue to flow even after pre-charging is complete. In other words, if there is a malfunction in the electrical equipment or a short circuit in the electrical path, the abnormal current will be added to the original pre-charge current when the pre-charge relay 17 is turned on. As a result, excess current flows throughout the time the pre-charge relay 17 is on, causing the current limiting resistor 18 to heat up.

[0030] At timing t2, the current Ir becomes greater than or equal to the threshold TH1, and all relays are turned off. After timing t2, the standby time TB is set. Therefore, even if a system start request is generated at timing t3 by turning on the start switch 31, the precharge relay 17 remains off. At timing t4, the standby time TB has elapsed, and the current limiting resistor 18 is cooled down.

[0031] Subsequently, at timing t5, when the start switch 31 is turned on, a system start request is generated, and the ground relay 16 and precharge relay 17 are turned on, and precharging begins. At timing t5, the power supply abnormality has been resolved, and at timing t6, after a predetermined time TA has elapsed, the main relay 15 and ground relay 16 are turned on, and the precharge relay 17 is turned off. This enables power supply from the battery 11 to the high-voltage electrical load 21. Subsequently, at timing t7, the main relay 15 and ground relay 16 are turned off in conjunction with the turning off of the start switch 31.

[0032] According to the embodiment described in detail above, the following excellent effects can be obtained.

[0033] In the power supply system, it is possible that an abnormal current flow may occur where current continues to flow even after precharging is complete while the precharge relay 17 is in the ON state. Considering this point, it is determined whether or not an abnormal current flow has occurred after the precharge relay 17 is turned ON. If an abnormal current flow has occurred, the precharge relay 17 is turned OFF, and it is not permitted to turn the precharge relay 17 ON until a predetermined period (waiting time TB) has elapsed. This prevents overheating of the current limiting resistor 18 when an abnormal current flow occurs. As a result, appropriate measures can be taken when an abnormal current flow occurs after precharging.

[0034] After the precharge relay 17 is turned on, the temperature of the current limiting resistor 18 rises in proportion to the amount of current flowing through it. In this case, the system is configured to determine whether or not there is a current supply abnormality based on the detection information of the current supplied after the precharge relay 17 is turned on, so that the occurrence of a current supply abnormality can be properly determined.

[0035] When an abnormality in the electrical supply is detected, the pre-charge relay 17 is permitted to turn on after a predetermined period has elapsed, i.e., after the current limiting resistor 18 has finished cooling. This prevents pre-charging from being unnecessarily restricted when the abnormality in the electrical supply is temporary and is resolved. Therefore, it is possible to prevent the vehicle from becoming immobile after the current limiting resistor 18 has cooled down.

[0036] When restricting the ON operation of the pre-charge relay 17 in response to an abnormality in the power supply, the system is configured to notify the user of the abnormality within that restriction period. This allows the system to appropriately inform the user of the cause if the vehicle does not start despite the user turning on the start switch 31. It also allows the user to be prompted to have repairs done.

[0037] (Second Embodiment) Next, a second embodiment, which modifies a part of the first embodiment described above, will be explained. Figure 4 shows a schematic configuration of the power supply system in this embodiment. In Figure 4, a difference from Figure 1 is that a temperature sensor 41 for detecting the temperature (resistance temperature Tr) of the current limiting resistor 18 is provided instead of the current sensor 32. In this embodiment, an abnormality in the energization is determined based on the resistance temperature Tr after the start of precharging, and after that determination, the precharging relay 17 is not permitted to turn on for a predetermined period until the resistance temperature Tr drops to a predetermined temperature, and the precharging relay 17 is permitted to turn on after the resistance temperature Tr drops.

[0038] Figure 5 is a flowchart showing the relay control processing procedure in the second embodiment, which is performed by the control device 30 at predetermined intervals after the start switch 31 is turned ON.

[0039] In Figure 5, step S21 determines whether the standby flag F is set to 1, or in other words, whether it has been determined that an abnormality occurred due to the temperature of the current limiting resistor 18 prior to the present time, and whether that history has been stored as flag information. In the initial state where no abnormality has been determined, the standby flag F = 0. Then, based on the condition that the standby flag F is 0, the process proceeds to step S24. In step S24, the main relay 15 is turned off, and the ground relay 16 and precharge relay 17 are turned on. This starts the precharge process.

[0040] Subsequently, in step S25, the system waits for a predetermined time TA to elapse from the time the precharge relay 17 is turned on, and in the following step S26, it is determined whether the resistance temperature Tr is less than a predetermined threshold TH11 based on the value detected by the temperature sensor 41. In this embodiment, the resistance temperature Tr at the time the predetermined time TA has elapsed is the temperature detection information of the current limiting resistor 18 and corresponds to a parameter indicating the magnitude of the amount of current supplied during the precharge energization period. The threshold TH11 is predetermined based on the amount of current required to charge the capacitor 22. Note that the threshold TH11 may be determined as a relative temperature with respect to the resistance temperature Tr at the start of precharge. If the power supply system is normal, the resistance temperature Tr will be less than the threshold TH11, step S26 will be affirmed, and the system will proceed to step S27.

[0041] In step S27, the main relay 15 and the ground relay 16 are turned ON, and the precharge relay 17 is turned OFF. This enables power supply from the battery 11 to the high-voltage electrical load 21.

[0042] Subsequently, in step S28, it is determined whether the start switch 31 has been turned off. If the start switch 31 has been turned off, the process proceeds to step S29, where the main relay 15, ground relay 16, and precharge relay 17 are all turned off.

[0043] On the other hand, if it is determined in step S26 that the resistance temperature Tr is greater than or equal to the threshold TH11, the process proceeds to step S30. In step S30, the main relay 15, ground relay 16, and precharge relay 17 are all turned off. In step S31, the standby flag F is set to 1. In step S31, it is also advisable to notify the user that an abnormality has occurred.

[0044] After the standby flag F is set, step S21 is affirmed after the start switch 31 is turned on thereafter, and the process proceeds to step S22. In step S22, it is determined whether the resistance temperature Tr is less than a predetermined threshold TH12. The threshold TH12 is a lower temperature than the threshold TH11 used in step S26. Step S22 is denied during the period until the resistance temperature Tr falls below the threshold TH12. As a result, energization via the precharge relay 17 is prohibited until the current limiting resistor 18 has finished cooling. When the resistance temperature Tr falls below the threshold TH12, the process proceeds to step S23, and the standby flag F is reset to 0. After that, the processing from step S24 onwards is carried out as described above.

[0045] Figure 6 is a time chart to explain the relay control described above in more detail. Figure 6 assumes a situation where an abnormality in the power supply system occurs, but for comparative explanation, the change in resistance temperature under normal conditions is shown by a dashed line.

[0046] In Figure 6, at timing t11, the ground relay 16 and precharge relay 17 are turned on when the start switch 31 is turned on, and precharging begins. At this time, as the capacitor 22 charges, the resistance temperature Tr gradually rises. If the system is functioning normally, as shown by the dashed line, the power supply is stopped when precharging is completed before the predetermined time TA has elapsed, and the resistance temperature Tr changes from rising to falling. Subsequently, although not shown, at timing t12, the main relay 15 and ground relay 16 turn on, and the precharge relay 17 turns off.

[0047] On the other hand, if a power supply abnormality occurs in the power supply system, the rate of temperature rise becomes steeper after timing t11 compared to when the system is functioning normally, and the resistance temperature Tr continues to rise even after pre-charging is complete. As a result, at timing t12, the resistance temperature Tr exceeds the threshold TH11, and all relays are turned off. Also, at timing t12, the standby flag F is set to 1. It is also possible to configure the system so that all relays are turned off when the resistance temperature Tr rises to the threshold TH11.

[0048] Subsequently, even if a system start request is generated at timing t13 by turning on the start switch 31, the precharge relay 17 remains off because the standby flag F is 1 and the resistance temperature Tr is above the threshold TH12. However, at timing t14, the resistance temperature Tr falls below the threshold TH12 due to the cooling of the current limiting resistor 18.

[0049] Subsequently, at timing t15, when the start switch 31 is turned on, a system start request is generated. Since the resistance temperature Tr is below the threshold TH12, the standby flag F is reset to 0, and the ground relay 16 and precharge relay 17 are turned on, initiating precharging. At timing t15, the energization abnormality is resolved, and the subsequent excessive rise in resistance temperature Tr is suppressed. Therefore, at timing t16, the main relay 15 and ground relay 16 are turned on, and the precharge relay 17 is turned off. Then, at timing t17, the main relay 15 and ground relay 16 are turned off in conjunction with the turn off of the start switch 31.

[0050] According to the second embodiment described above, the presence or absence of an abnormality in the energization is determined based on the temperature detection information of the current limiting resistor 18 after the precharge relay 17 is turned on, so that the occurrence of an abnormality in the energization can be properly determined.

[0051] Furthermore, since the configuration is such that the pre-charge relay 17 is not permitted to be turned on for a predetermined period after it is determined that an abnormality in the current supply has occurred, until the temperature of the current limiting resistor 18 (resistance temperature Tr) drops to a predetermined temperature, it is possible to effectively suppress the pre-charge relay 17 from being turned on before the temperature drops.

[0052] (Other embodiments) The above embodiment may be modified as follows, for example.

[0053] In the first embodiment described above, the current Ir at the end of a predetermined time TA is acquired as a parameter indicating the magnitude of the amount of current supplied during the pre-charge energizing period, but this can be changed. For example, the integrated current value, which is the cumulative value of the energizing current after the pre-charge relay 17 is turned on, may be acquired as a parameter. Alternatively, the maximum value of the energizing current immediately after the pre-charge relay 17 is turned on may be acquired as a parameter.

[0054] It is also possible to use both detection information of the current flowing through the current limiting resistor 18 and detection information of the temperature of the current limiting resistor 18 as parameters indicating the magnitude of the amount of current supplied during the pre-charge energization period. For example, an energization abnormality may be determined to have occurred if, at the time of a predetermined time TA, the current Ir is above a predetermined level and the resistance temperature Tr is above a predetermined level. Alternatively, an energization abnormality may be determined to have occurred based on whichever comes first: the cumulative current value after the pre-charge relay 17 is turned on is above a predetermined level, or the resistance temperature Tr is above a predetermined level.

[0055] • In the current limiting resistor 18, the amount of heat generated changes depending on the amount of current supplied after the precharge relay 17 is turned on, and the length of the predetermined period required to cool the current limiting resistor 18 also changes. Taking this into consideration, the predetermined period may be set variably based on a parameter indicating the magnitude of the amount of current supplied during the precharge supply period. For example, using the relationship shown in Figure 7, the control device 30 sets the standby time TB to a longer time the larger the integrated current value after the precharge relay 17 is turned on. Alternatively, the standby time TB may be set to a longer time the larger the current Ir at the end of the predetermined time TA, or the standby time TB may be set to a longer time the higher the resistance temperature Tr at the end of the predetermined time TA. In short, any configuration that lengthens the predetermined period is acceptable as long as the integrated current value after the precharge relay 17 is turned on (i.e., the amount of heat generated by the current limiting resistor 18) is large.

[0056] As a result, after a power supply anomaly occurs, the cooling completion of the current limiting resistor 18 is determined at the appropriate timing, and precharging is permitted. By optimizing the cooling determination of the current limiting resistor 18, it is possible to prevent precharging from being unnecessarily restricted when the power supply anomaly is temporary and has been resolved.

[0057] In the above embodiment, a main relay 15 is provided as a power switch in the positive terminal path 12, and a precharge relay 17 and a current limiting resistor 18 are connected in parallel to the main relay 15. However, this configuration may be changed to provide a ground relay 16 as a power switch in the negative terminal path 13, and a precharge relay 17 and a current limiting resistor 18 are connected in parallel to the ground relay 16. Alternatively, instead of providing a main relay 15 and a ground relay 16 in each of the positive and negative terminal paths 12 and 13, a configuration may be provided with only one of the main relay 15 on the positive terminal side and the ground relay 16 on the negative terminal side, and that relay may be used as the power switch.

[0058] Other switching devices besides relays may be used as power switches or precharge switches. For example, semiconductor switches can be used.

[0059] • In the above embodiment, the present disclosure was applied to a high-voltage power supply system for an electric vehicle, but other applications are also possible. For example, it can be applied to power supply systems for various types of mobile objects such as aircraft and ships, as well as to power supply systems for stationary devices.

[0060] The control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control unit and its method described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0061] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure.

Claims

1. This is applied to a power supply system in which an electrical load (21) and a capacitor (22) are connected to a battery (11) via electrical paths (12, 13), while a power switch (15, 16) is connected to the electrical path, and a series connection of a precharge switch (17) and a current limiting resistor (18) is connected in parallel to the power switch. A control device (30) that, in response to a system startup request, causes power to be supplied through the precharge switch prior to power supply through the power switch, thereby precharging the capacitor, An acquisition unit that acquires at least one of the detection information of the current flowing through the current limiting resistor and the detection information of the temperature of the current limiting resistor after the precharge switch is turned on, as a parameter indicating the magnitude of the amount of current supplied during the precharge energization period when the precharge switch is turned on. An abnormality determination unit determines, based on the parameters acquired by the acquisition unit, whether or not an abnormality has occurred in which power continues to be supplied through the precharge switch after the precharge of the capacitor is completed after the precharge switch is turned on, If it is determined that the aforementioned power supply abnormality has occurred, the switch control unit turns off the precharge switch and does not allow the precharge switch to be turned on until a predetermined period of time has elapsed, A setting unit sets the predetermined period based on the parameters acquired by the acquisition unit, Equipped with, The setting unit is a control device that lengthens the predetermined period as the value of the parameter increases, based on the cumulative value of the energized current after the precharge switch is turned on.

2. The control device according to claim 1, wherein the switch control unit, when it is determined that an abnormality in the current supply has occurred, permits the precharge switch to be turned on based on the elapsed period of time.

3. This is applied to a power supply system in which an electrical load (21) and a capacitor (22) are connected to a battery (11) via electrical paths (12, 13), while a power switch (15, 16) is connected to the electrical path, and a series connection of a precharge switch (17) and a current limiting resistor (18) is connected in parallel to the power switch. A program that, in response to a system startup request, causes power to be supplied through the precharge switch prior to power supply through the power switch, thereby precharging the capacitor, In the control device, An acquisition step to acquire at least one of the detection information of the current flowing through the current limiting resistor and the detection information of the temperature of the current limiting resistor after the precharge switch is turned on, as a parameter indicating the magnitude of the amount of current supplied during the precharge energization period when the precharge switch is turned on, An abnormality determination step, based on the parameters obtained in the acquisition step, determines whether or not an abnormality has occurred in which power continues to be supplied through the precharge switch after the precharge of the capacitor is completed after the precharge switch is turned on, If it is determined that the aforementioned power supply abnormality has occurred, a switch control step is performed to turn off the precharge switch and not allow the precharge switch to be turned on until a predetermined period of time has elapsed. A setting step in which the predetermined period is set based on the parameters obtained in the acquisition step, Make it run, A program that, in the setting step, lengthens the predetermined period as the value of the parameter increases, the larger the integrated value of the current supplied after the precharge switch is turned on.

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