Power supply control device and computer program

Abstract

To provide a power supply control device and a computer program that enable appropriate handling in accordance with an added or exchanged new on-vehicle machine.SOLUTION: Provided is a vehicle power supply control device that controls power supply to an on-vehicle machine, including: a switch that interrupts power supply to the on-vehicle machine; and a control unit that acquires, from the newly connected new on-vehicle machine, new apparatus information related to the new on-vehicle machine and performs open / close control over the switch based on the acquired new apparatus information.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a power supply control device and a computer program mounted on a vehicle.

Background Art

[0002] Conventionally, in a vehicle, a power supply control device is interposed between a power source and in-vehicle devices, and distributes power supplied from the power source to each in-vehicle device.

[0003] On the other hand, Patent Document 1 discloses a load control device interposed between a power source and a load, which branches a line from the power source into a plurality of lines and connects to the load via a plurality of branched lines as necessary.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When an in-vehicle device is connected to a power supply control device, if an overcurrent equal to or higher than a threshold value flows, there is a risk of malfunction or destruction. Also, due to reasons such as different activation timings by in-vehicle devices, it is necessary to appropriately supply power from the power supply control device according to the specifications of the connected in-vehicle device.

[0006] However, when a new in-vehicle device is newly connected to a power supply control device and the specifications of such a new in-vehicle device are unknown, the power supply control device cannot respond appropriately. That is, the threshold value of the current allowed for the new in-vehicle device is unknown, and there is a risk that an overcurrent equal to or higher than such a threshold value flows from the power supply control device to the new in-vehicle device, or the new in-vehicle device cannot be activated at an appropriate timing and cannot perform its original function.

[0007] However, Patent Document 1 does not consider or address this problem.

[0008] This invention has been made in view of the above circumstances, and its purpose is to provide a power supply control device and a computer program that can appropriately respond to new in-vehicle equipment that is added or replaced. [Means for solving the problem]

[0009] A power supply control device according to the embodiment of the present disclosure is a power supply control device for a vehicle that controls the supply of power to an in-vehicle device, comprising: a switch that intermittently supplies power to the in-vehicle device; and a control unit that acquires new equipment information relating to a newly connected in-vehicle device from the newly connected in-vehicle device and controls the opening and closing of the switch based on the acquired new equipment information.

[0010] The computer program according to the embodiment of this disclosure causes the computer of a vehicle power supply control device that controls the power supply to an in-vehicle device to acquire new equipment information relating to the newly connected in-vehicle device from the newly connected in-vehicle device, and to execute a process to control the opening and closing of a switch that intermittently supplies power to the new in-vehicle device based on the acquired new equipment information. [Effects of the Invention]

[0011] According to this disclosure, it is possible to provide a power supply control device and a computer program that can appropriately respond to new in-vehicle equipment that is added or replaced. [Brief explanation of the drawing]

[0012] [Figure 1] This is a functional block diagram showing the main components of a vehicle equipped with the power supply control device according to Embodiment 1. [Figure 2] This is a flowchart illustrating the switch opening and closing control performed by the power supply control device according to Embodiment 1. [Figure 3] This is a functional block diagram showing the main components of a vehicle equipped with the power supply control device according to Embodiment 2. [Figure 4] This is a flowchart illustrating the switch opening and closing control performed by the power supply control device according to Embodiment 2. [Modes for carrying out the invention]

[0013] [Description of Embodiments of the Invention] First, embodiments of this disclosure will be listed and described. Furthermore, at least some of the embodiments described below may be combined in any way.

[0014] (1) A power supply control device according to the embodiment of the present disclosure is a power supply control device for a vehicle that controls the supply of power to an in-vehicle device, comprising a switch for interrupting the supply of power to the in-vehicle device, and a control unit that acquires new equipment information relating to a newly connected in-vehicle device from the newly connected in-vehicle device and controls the opening and closing of the switch based on the acquired new equipment information.

[0015] In this embodiment, when a new in-vehicle unit is connected to the device, the control unit acquires new equipment information relating to the newly connected in-vehicle unit, controls the opening and closing of the switch based on the acquired new equipment information, and intermittently supplies power to the new in-vehicle unit. Therefore, power can be supplied appropriately according to the new in-vehicle unit being added or replaced.

[0016] (2) In the power supply control device according to the embodiment of the present disclosure, the control unit acquires the new equipment information when supplying power to the new in-vehicle unit for the first time.

[0017] In this embodiment, when supplying initial power to the new in-vehicle unit, the control unit acquires new equipment information relating to the newly connected in-vehicle unit from the newly connected in-vehicle unit, and controls the opening and closing of the switch based on the acquired new equipment information to intermittently supply power to the new in-vehicle unit. Therefore, power can be supplied appropriately according to the new in-vehicle unit being added or replaced.

[0018] (3) The power supply control device according to an embodiment of the present disclosure, the control unit performs the opening / closing control based on basic information stored in the storage unit in advance, and when acquiring the new device information from the new in-vehicle device, changes the basic information based on the acquired new device information.

[0019] In this embodiment, when a new in-vehicle device is newly connected to the self-device, the opening / closing control is performed based on basic information stored in the storage unit in advance, and when acquiring the new device information from the new in-vehicle device, the basic information is changed based on the acquired new device information, and the opening / closing control is performed based on the changed basic information. Therefore, power supply can be appropriately performed according to the newly added or replaced in-vehicle device.

[0020] (4) The power supply control device according to an embodiment of the present disclosure, the new device information includes information related to the opening / closing timing of the switch of the new in-vehicle device that intermittently connects to the self-device.

[0021] In this embodiment, when a new in-vehicle device is newly connected to the self-device, the control unit acquires the information related to the opening / closing timing from the new in-vehicle device, and performs the opening / closing control of the switch based on the acquired information related to the opening / closing timing, and intermittently supplies power to the new in-vehicle device. Therefore, power supply can be appropriately performed according to the newly added or replaced in-vehicle device.

[0022] (5) The power supply control device according to an embodiment of the present disclosure, the new device information includes information related to the current consumption value or dark current value of the new in-vehicle device.

[0023] In this embodiment, when a new in-vehicle device is newly connected to the self-device, the control unit acquires the information related to the current consumption value or dark current value from the new in-vehicle device, and performs the opening / closing control of the switch based on the acquired information related to the current consumption value or dark current value, and intermittently supplies power to the new in-vehicle device. Therefore, power supply can be appropriately performed according to the newly added or replaced in-vehicle device.

[0024] (6) In the power supply control device according to the embodiment of the present disclosure, the new equipment information includes information relating to the startup time or shutdown time of the new in-vehicle unit.

[0025] In this embodiment, when a new in-vehicle unit is connected to the device, the control unit acquires information regarding the start-up time or stop-down time from the new in-vehicle unit, and controls the opening and closing of the switch based on the acquired information regarding the start-up time or stop-down time, thereby intermittently supplying power to the new in-vehicle unit. Therefore, power can be supplied appropriately according to the new in-vehicle unit being added or replaced.

[0026] (7) The computer program according to the embodiment of the present disclosure causes the computer of a vehicle power supply control device that controls the power supply to an in-vehicle device to acquire new equipment information relating to the newly connected in-vehicle device from the newly connected in-vehicle device, and to execute a process that controls the opening and closing of a switch that intermittently supplies power to the new in-vehicle device based on the acquired new equipment information.

[0027] In this embodiment, when a new in-vehicle unit is connected to the device, new equipment information relating to the newly connected in-vehicle unit is acquired, and the switching of the switch is controlled based on the acquired new equipment information. Therefore, appropriate power supply is possible according to the newly added or replaced in-vehicle unit.

[0028] [Details of the Embodiments of the Invention] A power supply control device and a computer program according to embodiments of this disclosure will be described below with reference to the drawings. However, the present invention is not limited to these examples, and is intended to include all modifications within the meaning and scope of the claims, as indicated by the claims.

[0029] (Embodiment 1) Figure 1 is a functional block diagram showing the main components of a vehicle 500 equipped with a power supply control device 100 according to Embodiment 1. The vehicle 500 includes the power supply control device 100 and a power supply 200.

[0030] The power supply 200 is, for example, a battery, and the new in-vehicle device 300 is connected to the power supply control device 100. The new in-vehicle device 300 is, for example, an electrical device such as a room lamp or a drive recorder. As shown in Figure 1, the power supply control device 100 is interposed between the power supply 200 and the new in-vehicle device 300 and controls the power supply from the power supply 200 to the new in-vehicle device 300.

[0031] For example, the power supply control device 100 according to Embodiment 1 is equipped with an output terminal (not shown), to which a power wiring L is connected. The new in-vehicle unit 300 is connected to the power supply control device 100 via the power wiring L. The power input from the power supply 200 to the power supply control device 100 is supplied to the new in-vehicle unit 300 via the power wiring L. At this time, the power supply control device 100 controls the power supply to the in-vehicle unit.

[0032] Figure 1 illustrates a case where power wiring L is unused power wiring, and a new in-vehicle unit 300 is newly connected to power wiring L. For convenience, the new in-vehicle unit 300 is shown with a dashed line in Figure 1.

[0033] The following explanation uses the example of a new in-vehicle unit 300 being newly connected to a spare power wiring L, but is not limited to this. It may also apply to cases where an in-vehicle unit already connected to power wiring L is replaced with a new in-vehicle unit 300.

[0034] The power supply control device 100 comprises a storage unit 20, a control unit 10, and a switch 30. Switch 30 is interposed between the power supply 200 and the new in-vehicle unit 300. That is, the power wiring from the power supply 200 is connected to switch 30, and as described above, switch 30 is connected to the new in-vehicle unit 300 via the power wiring L. The control unit 10 controls the power supply to the new in-vehicle unit 300 by controlling the opening and closing of switch 30.

[0035] The storage unit 20 is composed of volatile memory elements such as RAM (Random Access Memory), or non-volatile memory elements such as ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable ROM), or flash memory. The storage unit 20 pre-stores the control program P and data to be referenced during processing. The storage unit 20 also stores a reference table. In the reference table, electrical signals (described later) are associated with cutoff thresholds as new device information.

[0036] The control program P stored in the memory unit 20 may be a control program P read from a recording medium A that the control unit 10 can read. Alternatively, the control program P stored in the memory unit 20 may be one downloaded by the control unit 10 from an external source (not shown) connected to a communication network (not shown) and stored in the memory unit 20.

[0037] The control unit 10 consists of, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) or other arithmetic processing unit. The control unit 10 performs various control and arithmetic processing by reading and executing control programs P and data pre-stored in the storage unit 20. The control unit 10 is connected to the switch 30 by an internal bus and multiple signal lines, and performs opening and closing control of the switch 30.

[0038] Switch 30 is a semiconductor switch configured as, for example, an IPD (Intelligent Power Device). Switch 30 is configured as an IPD (Intelligent Power Device) equipped with, for example, a FET (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). Switch 30 intermittently supplies power to the new in-vehicle unit 300 via the power wiring L. Switch 30 also functions as a current detection unit.

[0039] The control unit 10 performs PWM control by outputting (applying) a gate signal (PWM control signal) to the gate terminal of the switch 30, thereby opening and closing the switch 30. In other words, the switch 30 is opened and closed in accordance with the PWM control signal input from the control unit 10, and a pulse voltage (power) is output to the new in-vehicle unit 300 accordingly.

[0040] The opening and closing control of switch 30 is performed according to the specifications of the newly connected in-vehicle unit 300. For example, the control unit 10 controls the opening and closing of the switch 30 in accordance with the new in-vehicle unit 300, thereby preventing overcurrent from flowing to the new in-vehicle unit 300. Specifically, the switch 30 is set based on a threshold value (hereinafter referred to as the interruption threshold) used to interrupt overcurrent, which is determined according to the new in-vehicle unit 300. If a current exceeding this interruption threshold flows through the switch 30, the control unit 10 closes the switch 30.

[0041] More specifically, if there is a risk of malfunction or damage occurring when a current greater than 10A flows through the new in-vehicle unit 300, the tripping threshold for the new in-vehicle unit 300 is 10A. If a current exceeding 10A (tripping threshold) flows through the switch 30, the control unit 10 opens the switch 30, thereby interrupting the flow of overcurrent exceeding the tripping threshold through the new in-vehicle unit 300.

[0042] When a new in-vehicle unit 300 is connected to the power supply control device 100, it is assumed that either a new in-vehicle unit 300 is connected to an unused power wiring L, or an already connected in-vehicle unit is replaced with a new in-vehicle unit 300.

[0043] In this case, if a new in-vehicle unit 300 is connected, the specifications of the new in-vehicle unit 300 may not be known, and the power supply control device 100 may not be able to respond appropriately. For example, if a new in-vehicle unit 300 is newly connected, the cutoff threshold for the new in-vehicle unit 300 is unknown, and the control unit 10 cannot properly control the opening and closing of the switch 30, which may cause an overcurrent exceeding the cutoff threshold to flow to the new in-vehicle unit 300.

[0044] The power supply control device 100 according to Embodiment 1 can address such problems. This will be explained below. For convenience, the following explanation will use the case in which a new in-vehicle unit 300 is connected to an unused power wiring (power wiring L) as an example.

[0045] Figure 2 is a flowchart illustrating the opening and closing control of the switch 30 performed by the power supply control device 100 according to Embodiment 1.

[0046] For example, if the control unit 10 receives a signal to turn on the ignition power output from the IG switch (not shown) of the vehicle 500, it determines whether or not a new in-vehicle device 300 is connected to the power wiring L (step S101).

[0047] For example, the control unit 10 makes the determination by monitoring the current value flowing through the switch 30. If such current value is "0", the control unit 10 determines that the new in-vehicle unit 300 is not connected to the power wiring L (step S101: NO), and terminates the process.

[0048] Furthermore, if such a current value is not "0", the control unit 10 determines that a new in-vehicle unit 300 is connected to the power wiring L (step S101: YES), and obtains in-vehicle unit information related to the new in-vehicle unit 300 from the new in-vehicle unit 300 (step S102). Here, the in-vehicle unit information is information that represents the specifications of the new in-vehicle unit 300, and includes, for example, the cutoff threshold of the new in-vehicle unit 300. Hereinafter, the in-vehicle unit information related to the new in-vehicle unit 300 will be referred to as new equipment information.

[0049] In other words, when power is supplied for the first time to a newly connected in-vehicle unit 300, the new in-vehicle unit 300 transmits an electrical signal to the control unit 10 via the power wiring L to identify new equipment information relating to itself, and the control unit 10 acquires the new equipment information based on the electrical signal from the new in-vehicle unit 300.

[0050] More specifically, when power is supplied for the first time, the new in-vehicle unit 300 transmits an electrical signal by opening and closing a switch 301 on its own equipment a predetermined number of times at predetermined intervals. That is, the new in-vehicle unit 300 transmits an electrical signal to the power supply control device 100 that identifies the new equipment information of its own equipment, consisting of a combination of the number of times the switch 301 is opened and closed and the opening and closing intervals. The control unit 10 acquires the electrical signal from the new in-vehicle unit 300 by monitoring the current flowing through the switch 30.

[0051] The control unit 10, having acquired the electrical signal, identifies the cutoff threshold (new equipment information) for the newly connected in-vehicle device 300 by referring to the reference table in the storage unit 20. Thereafter, the control unit 10 controls the opening and closing of the switch 30 using the identified cutoff threshold (step S103), thereby preventing an overcurrent exceeding the cutoff threshold from flowing to the new in-vehicle device 300.

[0052] This allows the power supply control device 100 to respond appropriately even when a new in-vehicle unit 300 with unknown specifications is connected to it, or when an unexpected new in-vehicle unit 300 is connected. Therefore, the new in-vehicle unit 300 can be operated appropriately regardless of the nature of the new in-vehicle unit 300.

[0053] In the above explanation, we have used the example of a case where the cutoff threshold is stored as new device information in the reference table, that is, where the new device information is the cutoff threshold, but we are not limited to this. The new device information may also be the opening and closing timing of the switch 301 of the new in-vehicle unit 300 that intermittently connects to the power supply control device 100. Specific examples of such opening and closing timings include opening and closing in conjunction with the ACC relay, opening and closing in conjunction with the door lock, etc.

[0054] Furthermore, the new equipment information may also be the current consumption value or dark current value of the new in-vehicle unit 300. In this case, the power supply control device 100 (control unit 10) controls the opening and closing of the switch 30 based on the remaining amount of power supply 200 and the current consumption value or dark current value of the new in-vehicle unit 300.

[0055] Furthermore, the new equipment information may also be the startup time or shutdown time of the new in-vehicle unit 300. Here, startup time is the time from the start of power supply to startup, and shutdown time is the time from the stop of power supply to shutdown.

[0056] (Embodiment 2) Figure 3 is a functional block diagram showing the main components of a vehicle 500 equipped with the power supply control device 100 according to Embodiment 2.

[0057] The vehicle 500 is equipped with a power supply control device 100 and a power supply 200. Similar to Embodiment 1, a new on-board unit 300 is connected to the power supply control device 100, and the new on-board unit 300 is connected to the power supply control device 100 via power wiring L. Figure 3 illustrates a case where power wiring L is unused power wiring and the new on-board unit 300 is newly connected to power wiring L. Also, for convenience, the new on-board unit 300 is shown with a dashed line in Figure 3.

[0058] For example, power supply 200 is a battery, and new in-vehicle equipment 300 is electrical equipment such as a room lamp or a drive recorder. Power supply control device 100 is interposed between power supply 200 and new in-vehicle equipment 300 and controls the power supply from power supply 200 to new in-vehicle equipment 300.

[0059] The power supply control device 100 comprises a storage unit 20, a control unit 10, and a switch 30. The switch 30 intermittently connects the power supply 200 and the new in-vehicle unit 300.

[0060] Similar to Embodiment 1, the storage unit 20 pre-stores the control program P and data to be referenced during processing. In addition, in the power supply control device 100 according to Embodiment 2, the storage unit 20 stores basic on-board device information. Basic on-board device information is on-board device information that the storage unit 20 pre-stores as default. The storage unit 20, control unit 10, and switch 30 have already been described in Embodiment 1, so a detailed explanation will be omitted.

[0061] In the following explanation, we will use the case where the basic in-vehicle device information stored in the memory unit 20 is a cutoff threshold as an example. That is, the memory unit 20 has a cutoff threshold (hereinafter referred to as the basic cutoff threshold) pre-stored as basic in-vehicle device information.

[0062] Furthermore, in the power supply control device 100 according to Embodiment 2, the power supply control device 100 and the new in-vehicle unit 300 are connected by a communication line M in addition to the power wiring L. That is, the control unit 10 of the power supply control device 100 is connected to the communication line M, and the control unit 10 can communicate with the newly connected new in-vehicle unit 300 via the communication line M.

[0063] Figure 4 is a flowchart illustrating the opening and closing control of switch 30 performed by the power supply control device 100 according to Embodiment 2. For convenience, the following explanation will use the case where a new in-vehicle unit 300 is connected to an unused power wiring (power wiring L) as an example.

[0064] For example, when the control unit 10 receives a signal to turn on the ignition power from the IG switch of the vehicle 500, it determines whether or not the new in-vehicle unit 300 is connected (step S201).

[0065] For example, the control unit 10 makes the determination by monitoring the current value flowing through the switch 30. If such current value is "0", the control unit 10 determines that the new in-vehicle unit 300 is not connected (step S201: NO) and terminates the process.

[0066] Furthermore, if such a current value is not "0", the control unit 10 determines that a new in-vehicle device 300 is connected (step S201: YES), and determines whether or not new equipment information relating to the new in-vehicle device 300 has been acquired from the new in-vehicle device 300 (step S202). This determination is made by the control unit 10 monitoring the acquisition of new equipment information via the communication line M.

[0067] As described above, when power is supplied for the first time to a newly connected in-vehicle unit 300, if the new in-vehicle unit 300 transmits new device information stored in its own memory unit 302 to the control unit 10 via the communication line M, the power supply control device 100 can acquire new device information related to the new in-vehicle unit 300 from the new in-vehicle unit 300.

[0068] At this point, the control unit 10 determines that it has obtained new equipment information related to the new in-vehicle unit 300 from the new in-vehicle unit 300 (Step S202: YES). Next, the control unit 10 updates the basic in-vehicle unit information (basic cutoff threshold) that is pre-stored in the memory unit 20 based on the new equipment information received from the new in-vehicle unit 300 (Step S203).

[0069] Subsequently, the control unit 10 uses the updated basic in-vehicle device information to control the opening and closing of the switch 30 (step S204), thereby preventing an overcurrent exceeding the cutoff threshold from flowing to the new in-vehicle device 300.

[0070] On the other hand, if the new in-vehicle unit 300 does not have new equipment information relating to itself, the power supply control device 100 cannot acquire new equipment information from the new in-vehicle unit 300.

[0071] In this case, the control unit 10 determines that it has not acquired new equipment information from the new in-vehicle unit 300 (step S202: NO), and the process proceeds to step S204. In this case, the control unit 10 uses the basic in-vehicle unit information (basic interruption threshold) stored in the memory unit 20 to control the opening and closing of the switch 30, thereby interrupting the flow of overcurrent exceeding the interruption threshold to the new in-vehicle unit 300.

[0072] This allows the power supply control device 100 to respond appropriately even when a new in-vehicle device 300 with unknown specifications is connected to it, or when an unexpected new in-vehicle device 300 is connected.

[0073] In the above explanation, the case where the new equipment information is a cutoff threshold was used as an example, but the explanation is not limited to this. The new equipment information may be the opening and closing timing of the switch 301 of the new in-vehicle unit 300, the current consumption value or dark current value of the new in-vehicle unit 300, or the startup time or shutdown time of the new in-vehicle unit 300.

[0074] Furthermore, although the above explanation uses the example of a case where new equipment information for a new in-vehicle unit 300 used for updating basic in-vehicle unit information is sent to the power supply control device 100 via the communication line M, the explanation is not limited to this.

[0075] Similar to Embodiment 1, the reference table may be stored in the storage unit 20, and the power supply control device 100 may be configured to receive the electrical signal from the new in-vehicle device 300 and perform the update described above. That is, the power supply control device 100 (control unit 10) identifies (acquires) new equipment information by referring to the reference table based on the electrical signal from the new in-vehicle device 300, and updates the basic in-vehicle device information.

[0076] Furthermore, although the above explanation has used the example of a case where the power supply control device 100 (control unit 10) and the new in-vehicle device 300 communicate via a communication line M, the system is not limited to this, and may be configured to perform wireless communication.

[0077] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the claims, not in the sense described above, and all modifications are intended to be in the sense and scope equivalent to the claims.

[0078] The matters described in each embodiment can be combined with each other. Furthermore, the independent and dependent claims described in the claims can be combined with each other in any combination, regardless of the form of reference. In addition, the claims use a form in which claims referencing two or more other claims (multi-claim form), but are not limited to this. A form in which multi-claims referencing at least one multi-claim (multi-multi-claim) may also be used. [Explanation of Symbols]

[0079] 10 Control Unit 20 Memory section 30 switches 100 Power supply control device 200 power supply 300 New In-Vehicle Devices 301 Switch 302 Storage section 500 vehicles A recording medium M communication line L Power wiring P Control Program

Claims

1. A vehicle power supply control device that controls the power supply to an in-vehicle device, A switch is provided within the device to interrupt the power supply to the in-vehicle unit, The system includes a control unit that acquires new device information related to a newly connected in-vehicle unit from the newly connected in-vehicle unit and controls the opening and closing of the switch based on the acquired new device information, The aforementioned new equipment information includes a power supply control device that includes information relating to the startup or shutdown time of the new in-vehicle unit.

2. The power supply control device according to claim 1, wherein the control unit acquires the new equipment information when supplying power to the new in-vehicle unit for the first time.

3. The control unit, Based on the basic information stored in the memory unit beforehand, the opening and closing control is performed. The power supply control device according to claim 1, wherein when new equipment information is obtained from the new in-vehicle device, the basic information is modified based on the newly acquired new equipment information.

4. The power supply control device according to any one of claims 1 to 3, wherein the new equipment information includes information relating to the opening and closing timing of a switch of the new in-vehicle unit that disconnects and reconnects to the device.

5. The power supply control device according to any one of claims 1 to 3, wherein the new equipment information includes information relating to the current consumption value or dark current value of the new in-vehicle unit.

6. The computer of the vehicle's power supply control device, which controls the power supply to the in-vehicle equipment, New equipment information relating to the newly connected in-vehicle unit is acquired from the newly connected in-vehicle unit, including information relating to the startup time or shutdown time of the new in-vehicle unit. Based on the newly acquired equipment information, the power supply control device controls the opening and closing of a switch that intermittently supplies power to the new in-vehicle unit. A computer program that executes a process.

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