JP2022117007A - Charge/discharge device, charge/discharge system, program rewriting method, and computer program - Google Patents

Abstract

To provide a charge/discharge device, a charge/discharge system, a program rewriting method, and a computer program.SOLUTION: There is provided a charge/discharge device which is connected to a commercial power source or a DC power network via a power line, which has a connector to an on-vehicle power line to be connected to an on-vehicle storage battery arranged in a vehicle, and which controls charge/discharge with respect to the on-vehicle storage battery. The charge/discharge device includes: a communication section for performing a communication via a communication network; a storage section for storing, in a rewritable manner, a computer program for the control of charge/discharge; and an update processing section for updating the computer program. The update processing section receives an updated computer program from the communication section, and, when the charge/discharge device is in a charge/discharge operation, stops the charge/discharge operation, and, after the stop of the operation, rewrites a computer program in the storage section with a computer program having been received.SELECTED DRAWING: Figure 1

Description

The present invention relates to a charging/discharging device connected to a storage battery provided in a vehicle, a charging/discharging system, a program rewriting method, and a computer program.

A storage battery provided in an electric vehicle has a relatively large capacity of, for example, 5 to 100 kWh. V2H (Vehicle to Home), which enables electric power stored in these vehicles to be supplied not only to drive electric vehicles but also to homes, etc.; V2B (Vehicle to Building), which enables electric power to be supplied to buildings other than homes Techniques for realizing V2X including V2G (Vehicle to Grid) enabling supply to power grids have been proposed. Even in the event of a power outage due to a disaster, it is expected that electric vehicles that can be moved will be able to supply the stored power to sustain life and maintain factory operations. When implementing V2X, it is desirable to be able to charge and discharge in a planned manner under the control of an EMS (Energy Management System).

To realize V2X, a charging/discharging device that has a charging/discharging cable that is connected to the storage battery of the vehicle and that can perform charging/discharging control between control of charging/discharging in the vehicle and control from the EMS. deployment is required. The charging/discharging device needs to be compatible not only with vehicles of specific vehicle types, but also with almost all electric vehicles that can be charged and/or discharged. However, although there are standards for communication between electric vehicles and charging/discharging devices, there are no regulations on the content of communication.

Conventionally, in order to make the charging/discharging device compatible with the new electric vehicle, maintenance staff had to go to each charging/discharging device and perform update work. Although the charging/discharging device has a communication function with the EMS, it does not have a device for realizing data communication via a so-called communication network.

Various proposals have been made to provide the charging/discharging device with a data communication device to update the software. Patent Literature 1 discloses an invention that updates firmware during a time slot in which no charge time slot or discharge time slot is set. In Patent Document 1, when updating to a time slot in which a charging time slot or a discharging time slot is set, before the time required for updating from the end time of the charging time slot or the ending time of the discharging time slot It is disclosed to perform an update.

WO2016/051701

When the charging/discharging device performs charging/discharging in cooperation with the EMS, charging/discharging is performed around the clock according to demand and supply, and there is a possibility that the schedule may not be met. In a system that performs sequential charging/discharging, it is difficult to specify a time slot in which charging/discharging is not performed, and software update is difficult.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a charging/discharging device, a charging/discharging system, a program rewriting method, and a computer program.

A charging/discharging device according to an embodiment of the present disclosure is connected to a commercial power source or a DC power network via a power line, has a connector with an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle, and is connected to the on-vehicle storage battery. In a charging/discharging device for controlling charging/discharging, a communication unit that performs communication via a communication network, a storage unit that rewritably stores a computer program related to charging/discharging control, and updates of the computer program and an update processing unit, wherein the update processing unit receives the updated computer program from the communication unit, and when the charging/discharging device is in the charging/discharging operation, stops the charging/discharging operation, and stops the operation. Later, the computer program in the storage section is rewritten with the received computer program.

A charging/discharging system according to an embodiment of the present disclosure is connected to a commercial power source or a DC power network via a power line, has a connector with an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle, and is connected to the on-board storage battery. a charging/discharging device for controlling the charging/discharging of the charging/discharging device; and a communication device connected to the charging/discharging device for communication. A storage unit that rewritably stores such a computer program, and an update processing unit that updates the computer program. The update processing unit receives the updated computer program from the communication unit, and When the device is in charge/discharge operation, the charge/discharge operation is stopped, and after the operation is stopped, the computer program for controlling the charge/discharge device is rewritten with the received computer program.

A program rewriting method according to an embodiment of the present disclosure is connected to a commercial power supply or a DC power network via a power line, and has a connector for an on-vehicle power line connected to an on-vehicle storage battery provided in a vehicle. A method of rewriting a program of a charging/discharging device that controls charging/discharging in a charging/discharging device, wherein an updated computer program is received by a communication unit that performs communication via a communication network, and the charging/discharging device is in charge/discharge operation. In some cases, it includes a process of stopping the charge/discharge operation and, after the stop of the operation, rewriting the computer program related to charge/discharge control with the received computer program.

A computer program according to an embodiment of the present disclosure is connected to a commercial power supply or a DC power network via a power line, and is connected to a computer of a charging/discharging device having a connector to an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle. , receiving an updated computer program by a communication unit that performs communication via a communication network, stopping the charging and discharging operation when the charging and discharging device is in the charging and discharging operation, and after stopping the operation, the computer program has been received , the computer program is executed to rewrite the computer program relating to charge/discharge control.

In the charging/discharging device, the charging/discharging system, the program rewriting method, and the computer program of the present disclosure, even if the charging/discharging device is in operation, the charging/discharging device is temporarily stopped and updated.

A charging/discharging device according to an embodiment of the present disclosure includes a saving storage unit that saves a computer program before update, and the update processing unit controls charging/discharging with the computer program before rewriting of the storage unit. If it has been, it is saved in the saving storage unit and then rewritten.

In the charging/discharging device of the present disclosure, the computer program before rewriting is stored for saving. If a failure occurs during rewriting, the computer program before rewriting can be restored and operation can be restarted.

The charging/discharging device of an embodiment of the present disclosure determines whether an error has occurred in charging/discharging control based on the rewritten computer program, and if it is determined that an error has occurred, the charging/discharging operation is performed. The computer program is stopped, and the computer program in the storage unit is rewritten with the pre-update computer program saved in the storage unit for saving.

In the charging/discharging device of the present disclosure, when an error occurs in charging/discharging control in the rewritten computer program, the operation can be restarted by returning to the pre-rewritten computer program. Even if a problem occurs due to rewriting, the charge/discharge control can be continued, and the function as the V2X infrastructure can be maintained.

In the charging/discharging device according to an embodiment of the present disclosure, the update processing unit restarts the stopped operation after rewriting of the computer program is completed.

In the charging/discharging device of the present disclosure, after the computer program is rewritten, the charging/discharging that was being performed before the stop is resumed. Therefore, the charging/discharging can be continued after the program is updated.

In the charging/discharging device according to an embodiment of the present disclosure, the update processing unit determines whether the power supply from the commercial power source or the DC power network has stopped, and if it is determined that the power supply has stopped, the Waiting to update with the received updated computer program until the power supply is restored.

In the charging/discharging device of the present disclosure, updating is suspended in a situation where the commercial power supply fails or there is no power supply from the DC power grid, and when discharging is required, it is not hindered. Updates can be performed as soon as power is restored.

In the charging/discharging device according to an embodiment of the present disclosure, the update processing unit determines whether power supply from the commercial power source or the DC power network has stopped, and if it is determined that the power supply has stopped, update Even if you have already received the computer program that has been issued, you will not be able to update it.

In the charging/discharging device of the present disclosure, updating is not performed during a power outage or in a situation where there is no power supply from the DC power grid, and when discharging is required, the control is not hindered by stopping operation and updating.

When the power supply from the commercial power source or the DC power network is stopped, the charging/discharging device of one embodiment of the present disclosure determines whether or not the in-vehicle storage battery is discharging, and determines that the battery is discharging. If so, the update is disabled, and if it is determined that the battery is not being discharged, the update is performed.

In the charging/discharging device of the present disclosure, updating is not possible only when electric power from the on-vehicle storage battery is required during power outage and discharging, that is, in a situation where the commercial power supply is out of power or there is no power supply from the DC power network. do. Even during a power outage, the update can be performed if the update can be performed with power from the onboard storage battery or the storage battery provided in the device.

In the charging/discharging device according to an embodiment of the present disclosure, when receiving an updated computer program from the communication unit, the update processing unit accepts update availability, and when update availability is accepted, charging/discharging operation to stop and rewrite.

In the charging/discharging device of the present disclosure, updating is performed according to instructions from the owner or administrator of the charging/discharging device, thereby avoiding stoppage of operation at the timing when the user of the charging/discharging device is about to start charging. can be done.

In a charging/discharging device according to an embodiment of the present disclosure, the update processing unit acquires data regarding the operating state of the charging/discharging device, and transmits the acquired data from the communication unit.

The charging/discharging device of the present disclosure is provided with a communication unit capable of automatically receiving the computer program of the charging/discharging device, so that data regarding the operating state of the charging/discharging device can be collected and utilized outside the charging/discharging device. becomes possible.

In the charging/discharging system of one embodiment of the present disclosure, the communication device is connected for communication with a plurality of the charging/discharging devices, and the communication device sequentially or in parallel with the plurality of charging/discharging devices, Execute rewriting of the program by the received computer program.

In the charging/discharging system of the present disclosure, one communicable communication device executes update processing of computer programs in a plurality of charging/discharging devices. By reducing the number of communication devices that perform external communication for the charge/discharge device, both cost reduction and reliable program rewriting can be achieved.

According to the present disclosure, even if the charge/discharge device is in operation, the operation is stopped and the program is updated. It is possible to avoid the situation where the update timing coincides with that during operation, and the charging/discharging is given priority and the update cannot be performed.

1 is a schematic diagram of a charging/discharging system including a charging/discharging device; FIG. 1 is a block diagram showing a connection configuration of a charging/discharging device and a vehicle; FIG. 2 is a block diagram showing configurations of a communication device, a server device, and a client device; FIG. 4 is a flow chart showing an example of a program update procedure of the charging/discharging device; 4 is a flow chart showing an example of a program update procedure of the charging/discharging device; 9 is a flow chart showing an example of a program update procedure of the charging/discharging device in Modification 1. FIG. 9 is a flow chart showing an example of a program update procedure of the charging/discharging device in Modification 1. FIG. 10 is a flow chart showing an example of a program update procedure of the charging/discharging device in Modification 2. FIG. 10 is a flow chart showing an example of a program update procedure of the charging/discharging device in Modification 2. FIG. 14 is a flow chart showing an example of a program update procedure of a charging/discharging device in Modification 3. FIG. 14 is a flow chart showing an example of a program update procedure of a charging/discharging device in Modification 3. FIG. 9 is a flow chart showing an example of a program update procedure of the charging/discharging device according to the second embodiment; 9 is a flow chart showing an example of a program update procedure of the charging/discharging device according to the second embodiment; 4 is a flow chart showing an example of a program monitoring processing procedure in a communication device; FIG. 16 is a flow chart showing an example of a data transmission processing procedure by a communication device according to the fourth embodiment; FIG. FIG. 2 is a schematic diagram of a charging/discharging system in a second embodiment; FIG.

The present disclosure will be specifically described with reference to the drawings showing the embodiments thereof.

(First embodiment)
FIG. 1 is a schematic diagram of a charging/discharging system 200 including a charging/discharging device 1. FIG. A charging/discharging system 200 according to the first embodiment includes a power storage device 22, a power generating device 23, and a plurality of charging/discharging devices 1 installed in a parking lot that is a public facility. Electric power supplied from the power system E is branched to the vehicle V connected via the power storage device 22 , the power generation device 23 and the plurality of charging/discharging devices 1 at the distribution board 28 via the power line PL. Each charging/discharging device 1 is connected to a host device 29 via a distribution board 28 and a communication line CL. Each charging/discharging device 1 is connected to a communication device 4 . The communication device 4 can transmit and receive data via a public communication network N, which is the so-called Internet, to and from a server device 5 of a company in charge of maintenance of the charging/discharging device 1 by wireless communication (or wired communication). The server device 5 can transmit and receive data via the public communication network N to and from the client device 6 used by the owner of each charging/discharging device 1 or the administrator of the charging/discharging device 1 .

The host device 29 controls the transfer of power from the electric power system E to the storage device 22 and the vehicle V, and the transfer of power from the power generation device 23 to the storage device 22 or the vehicle V. FIG. In the first embodiment, the host device 29 is installed outside as a server device and controls the transfer of electric power in the area. It may control the charging and discharging of power generation in the power storage device 22 and the power generation device 23 . Host device 29 may be a host control device built into each charge/discharge device 1 .

The charging/discharging device 1 may be installed at home and charge/discharge the vehicle V under the control of the host device 29 .

FIG. 2 is a block diagram showing a connection configuration between the charging/discharging device 1 and the vehicle V. As shown in FIG. The vehicle V is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a fuel cell vehicle (FCV). is.

Vehicle V includes a large-capacity power storage device 30 that can be used to drive the vehicle. Vehicle V includes connector 35 to power line VPL connected to power storage device 30 , and vehicle-mounted charge/discharge control device 32 that controls charge/discharge in power storage device 30 . A DC relay 33 included in the charging/discharging circuit on the vehicle V side is interposed in the power line VPL, and the vehicle-mounted charging/discharging control device 32 controls ON and OFF of the DC relay 33 . The connector 35 includes a communication terminal for communication connection with the in-vehicle charge/discharge control device 32 .

The charging/discharging device 1 includes a charging/discharging circuit 10 , a control section 11 , a vehicle communication section 12 , a power supply section 13 , an operation section 14 , a server communication section 17 and an upper communication section 16 . The charge/discharge circuit 10 includes various circuit elements such as a bidirectional inverter and various relays. Charging/discharging circuit 10 includes a DC relay 10a connected to connector 15 connected to vehicle V, and a parallel-off relay 10b interposed in power line PL connected to power system E. The charge/discharge circuit 10 is connected to a connector 15 via a power line PL via a DC relay 10a.

The control unit 11 controls circuit elements included in the charging/discharging circuit 10, and controls charging/discharging switching, current amount, and voltage amount for the power storage device 30 of the vehicle V. FIG. The control unit 11 includes a CPU (Central Processing Unit) and a nonvolatile memory, and the CPU controls the charging/discharging circuit 10 by executing control processing based on a computer program 1P stored in the nonvolatile memory.

The computer program 1P stored in the nonvolatile memory of the control unit 11 may be the computer program 8P stored in the computer-readable storage medium 8 read by the CPU and stored in the memory.

The vehicle communication unit 12 can communicate with the vehicle-mounted charge/discharge control device 32 via the connector 15 and the connector 35 . The protocol of the communication connection of the vehicle communication unit 12 may conform to the charging/discharging method corresponding to the vehicle V and the connectors 15 and 35, and any one of the protocols may be selected so as to be applied to different charging/discharging methods. It may be executed selectively. In this embodiment, the vehicle communication unit 12 communicates with the in-vehicle charge/discharge control device 32 via CAN (Controller Area Network). Communication may be realized by a PLC.

The power supply unit 13 includes a UPS (Uninterruptible Power Systems) circuit and a start-up storage battery, and supplies power to the control unit 11 . The power supply unit 13 supplies electric power necessary for starting up the charging/discharging device 1 from the start-up storage battery during a power outage. The power supply unit 13 may charge the start-up storage battery with electric power from the electric power system E, the power generation device 23, or the vehicle V.

The operation unit 14 includes a display, a touch panel with a built-in display, and physical buttons, is exposed on the exterior of the charging/discharging device 1, and receives operations including START (activation) and STOP (end) from the user. Control unit 11 may control charge/discharge circuit 10 based on an operation accepted by operation unit 14 . The operation unit 14 includes a lamp and is controlled by the control unit 11 so as to light up in a color or pattern according to the state.

The host communication unit 16 realizes communication with the host device 29 via the communication line CL. The host communication unit 16 may be, for example, a communication module compatible with a communication line CL conforming to Ethernet (registered trademark), or a communication module compatible with a communication line CL compatible with ECHONET/ECHONET Lite (registered trademark). good too. The upper communication unit 16 may realize communication by PLC.

The server communication unit 17 is capable of communication connection with the communication device 4 . The server communication unit 17 is, for example, a communication module conforming to Ethernet (registered trademark). The server communication unit 17 is connected to the communication device 4 by wire. The server communication unit 17 may be a wireless communication module. The control unit 11 can communicate with the communication device 4 via the server communication unit 17 . The server communication unit 17 may be the same communication module as the upper communication unit 16, and the communication connection partners may be separated by different ports.

1 and 2, the charging/discharging circuit 10 of the charging/discharging device 1 configured as described above is connected to the DC relay 10a and the vehicle V side when the connector 15 is connected to the connector 35 of the vehicle V. is connected to the power storage device 30 of the vehicle V via the DC relay 33 of the power line PL. As shown in FIGS. 1 and 2, the charging/discharging circuit 10 is connected to the power system E via the parallel-off relay 10b and the distribution board 28, and the interconnected devices (power storage device 22, power generation device 23, etc.) and the power line PL. It is connected. The charging/discharging device 1 controls the transfer of electric power between the electric power system E, the power storage device 30 of the vehicle V, and the interconnected equipment. When the parallel-off relay 10b, the DC relay 10a, and the DC relay 33 are all in the ON state, the charging/discharging circuit 10 discharges the power storage device 30 to the power storage device 22 or discharges the power from the power system E via the power line PL. Charging can be performed.

FIG. 3 is a block diagram showing configurations of the communication device 4, the server device 5 and the client device 6. As shown in FIG. The communication device 4 functions as a gateway that enables the charging/discharging device 1 to communicate with the server device 5 of the provider, which is an external network. The communication device 4 includes a processing section 40 , a storage section 43 , a first communication section 41 and a second communication section 42 . The communication device 4 is connected to the charging/discharging device 1 not only by the communication line CL but also by the power line PL, and receives power supply from the power supply unit 13 of the charging/discharging device 1 to operate.

The processing unit 40 includes a CPU, executes control processing based on the control program 4P stored in the storage unit 43, and mediates transmission and reception of data between the server device 5 and the charging/discharging device 1. FIG.

The storage unit 43 is a non-volatile memory such as flash memory or SSD (Solid State Drive). The storage unit 43 stores a control program 4P read by the processing unit 40 for controlling the communication device 4 itself, and also stores computer programs 1P, 1P, . The control program 4P may be the control program 9P stored in the computer-readable storage medium 9 read by the CPU and stored in the memory.

The storage unit 43 rewritably stores the update timing of the program. The update timing may be, for example, a specified time period, such as from 2:00 am to 4:00 am, when it is expected that charging and discharging will not be performed. The update timing may be a set value according to the state of the charging/discharging device 1 as well as the set value of the time zone.

The first communication unit 41 is a communication module that realizes communication connection with the server device 5 via the public communication network N. FIG. The first communication unit 41 is specifically a wireless communication module that communicates and connects to the carrier communication network N2. The processing unit 40 can communicate with the server device 5 via the carrier communication network N2 and the public communication network N by the first communication unit 41 .

The second communication unit 42 is a communication module that realizes communication with the charging/discharging device 1 . The second communication unit 42 is, for example, a communication module conforming to Ethernet (registered trademark). The second communication unit 42 is connected to the server communication unit 17 of the charging/discharging device 1 by wire. The second communication unit 42 may be a wireless communication module.

The server device 5 is managed by the manufacturer of the charging/discharging device 1 or a business operator who performs maintenance and inspection. The server device 5 stores a computer program 1P for the charging/discharging device 1 and updates it as appropriate. The server device 5 may be implemented by a single server computer, or may be implemented by being distributed by a plurality of computers. The server device 5 can communicate with the communication device 4 and the client device 6 via the public communication network N and the carrier communication network N2. The server device 5 may have an interface via a web browser and function as a cloud server.

The client device 6 is a communication terminal device used by the owner or administrator of the charging/discharging device 1 . The client device 6 is, for example, a smart phone. The client device 6 includes a processing section 60 , a storage section 61 , a communication section 62 , a display section 63 and an operation section 64 .

The processing unit 60 includes a CPU and/or a GPU (Graphical Processing Unit). The processing unit 60 executes various programs stored in the storage unit 61 . The processing unit 60 can execute, for example, a web browser program among various programs, and display an information page regarding charging/discharging by the charging/discharging device 1 provided by the server device 5 on the display unit 63 . Alternatively, the processing unit 60 can execute, for example, a message program among various programs, acquire a message for the owner or administrator from the server device 5 , and display the message on the display unit 63 .

The communication unit 62 is a communication module for communication connection to the public communication network N or the carrier communication network N2. The communication unit 62 is, for example, a wireless communication module.

The display unit 63 is a display such as a liquid crystal display or an organic EL (Electro Luminescence) display. The display unit 63 displays an operation screen. The display unit 63 may be a display with a built-in touch panel.

The operation unit 64 is a user interface capable of input/output with the processing unit 60 . The operation unit 64 is, for example, a touch panel built into the display unit 63 . The operation unit 64 may be physical buttons. The operation unit 64 may be a voice input unit. The operation unit 64 notifies the processing unit 60 of operation data by the user.

In the charging/discharging system 200 configured as described above, when the computer program 1P for the charging/discharging device 1 is updated, the updated computer program 1P is stored together with the update information in the server device 5, and is sent to each charging/discharging device 1. It is ready for delivery. In the following, for ease of explanation, newer programs are denoted by the letter "v" and a larger number appended to the code "1P".

The charging/discharging device 1 updates the computer program 1P through the communication device 4 according to the processing procedure shown in the following flowchart. 4 and 5 are flowcharts showing an example of the program update procedure of the charging/discharging device 1. FIG. The control unit 11 continuously executes the following processes during startup.

The processing unit 40 determines whether or not the updated computer program 1P has been received by the communication device 4 (step S101).

The communication device 4 transmits a request for a new computer program 1P, for example, a computer program 1Pv1, from the first communication unit 41 to the server device 5. FIG. In response to the request, the server device 5 maintains a hung state (standby) until the new computer program 1Pv1 is uploaded (registered) in the server device 5 . When the computer program 1Pv1 is uploaded, the server device 5 transmits the computer program 1Pv1 (including program data, update script, etc.) to the communication device 4 in response to the request through the communication connection that has been in the hung state. The communication device 4 stores the new computer program 1Pv1 in the storage unit 43 when the first communication unit 41 receives the new computer program 1Pv1. The processing unit 40 of the communication device 4 preferably stores the stored computer program 1P so that the version information can be identified. A request for the next computer program 1Pv2 is transmitted from the first communication unit 41 to the server device 5 and waits (long polling). As a result, polling to inquire whether there is an update from the communication device 4 is not performed while the update is not performed, so the amount of communication can be minimized.

If it is determined in step S101 that the updated computer program 1P has not been received (S101: NO), the processing unit 40 returns the process to step S101 and waits until an update program is received.

When it is determined in step S101 that the updated computer program 1P has been received (S101: YES), the processing unit 40 determines whether or not it is the preset update timing (step S102). The update timing is rewritably stored in the storage unit 43 .

In step S102, if it is determined that it is not the update timing (S102: NO), the processing unit 40 returns the process to step S102 and waits until it is determined that it is the update possible timing.

In step S102, if it is determined that it is time to update (S102: YES), processing unit 40 stops charging and discharging device 1 to update the program even if charging/discharging is in progress. Therefore, the processing unit 40 determines whether or not the charging/discharging operation is in progress (step S103). If it is determined to be in operation (S103: YES), the processing unit 40 causes the control unit 11 to normally stop operation (boot instruction) (step S104), and unlocks the connector 15 and the connector 35. It is turned off (step S105), and the process proceeds to step S106. In step S<b>105 , the processing unit 40 transmits a lock OFF request to the control unit 11 . If the lock is already OFF (released state), the process of step S105 may be omitted. After step S104, a process of confirming whether or not the operation has actually been stopped may be executed.

If it is determined in step S103 that the vehicle is not in operation (S103: NO), the processing unit 40 advances the processing to step S105 because the stop processing is unnecessary. It should be noted that it is also possible to omit the judgment as to whether or not the vehicle is in operation in step S103, and execute the processing (S104) of stopping regardless of whether or not the vehicle is stopped.

The processing unit 40 causes the host communication unit 16 to transmit a program update start notification to the host device 29 (step S106). The processing unit 40 displays a program update start notification message on the display of the operation unit 14 (step S107).

The processing of steps S104 to S107 is executed by control unit 11 when processing unit 40 notifies control unit 11 of charging/discharging device 1 to start updating the program. Upon receiving the notification from the server communication unit 17, the control unit 11 starts update processing. The control unit 11 may store the update timing in a memory, and when the update timing arrives, autonomously stop the charging/discharging operation and start the process for updating.

After that, the operation unit 14 of the charging/discharging device 1 preferably outputs an output indicating that the program is being updated. A message "updating" may be displayed on the display of the operation unit 14, or the lamp of the operation unit 14 may be blinked. The processing unit 40 may notify the client device 6 of the program update start via the server device 5 . Thereafter, the server device 5 maintains the state of being updated until it receives a notification of program update completion or program update failure. The server device 5 may display an image and/or text indicating a state in which the program is being updated on the display unit 63 when a status acquisition request is received from the client device 6 .

The processing unit 40 saves the conventional computer program 1P, which has a track record of performing charging and discharging normally, in the storage unit 43 (step S108). In step S108, the processing unit 40 may store the newest computer program 1P among the conventional computer programs 1P, or store the updated computer programs 1P over a plurality of generations in association with version information. You can leave it.

The processing unit 40 starts installing (writing to the memory) the updated new computer program 1P (step S109). Specifically, in the process of step S109, the processing unit 40 transmits the computer program 1P to the charging/discharging device 1 from the second communication unit 42 by FTP (File Transfer Protocol).

The processing unit 40 determines whether or not a format error is detected during writing (step S110). When it is determined that the format error is not detected (S110: NO), the processing unit 40 determines whether or not writing is completed (step S111). If it is determined in step S111 that writing is not completed (S111: NO), the processing unit 40 returns the process to step S110.

If it is determined in step S111 that writing has been completed (S111: YES), the processing unit 40 causes the host communication unit 16 to transmit a program update completion notification to the host device 29 (step S112). The processing unit 40 displays a program update completion notification message on the display of the operation unit 14 (step S113). The processing unit 40 stores the version information of the computer program 1P whose update has been completed as a log in the storage unit 43 (step S114).

In steps S112 and S113, the processing unit 40 sends a boot instruction to the control unit 11 when the writing is completed. When the new computer program 1P can be started normally, the started control unit 11 displays a program update completion notification on the host device 29 and on the display of the operation unit 14 .

The processing unit 40 notifies the server device 5 of the completion of installation in association with the identification data of the charging/discharging device 1 (or the identification data such as the address of the communication device 4) (step S115). In step S115, the processing unit 40 may also transmit the version information of the computer program 1P that has been installed. As a result, the server device 5 transmits a notification page or notification message addressed to the client device 6 of the owner or administrator stored in association with the identification data of the charging/discharging device 1 . The host device 29 may notify the owner or administrator (client device 6) of the charging/discharging device 1 that the program has been updated.

The processing unit 40 turns on the lock of the connector 15 and the connector 35 in order to perform charging/discharging under the control of the host device 29 (step S116). The processing unit 40 establishes a communication connection with the in-vehicle charge/discharge control device 32 of the vehicle V (step S117), enters a standby state, and terminates the program update process.

If it is determined in step S110 that a format error has been detected (S110: YES), the processing unit 40 starts writing (reinstalling) the conventional computer program 1P that has been saved (step S118).

The processing unit 40 determines whether or not the reinstallation is completed (step S119). If it is determined in step S119 that the reinstallation is not completed (S119: NO), the processing unit 40 returns the process to step S119.

If it is determined in step S119 that the reinstallation has been completed (S119: YES), the processing unit 40 causes the host communication unit 16 to transmit a program update failure notification to the host device 29 (step S120). The processing unit 40 displays a program update failure notification message on the display of the operation unit 14 (step S121). The processing unit 40 advances the process to step S116 and restarts the charge/discharge control based on the conventional computer program 1P.

Also in steps S120 and S121, the processing unit 40 sends a boot instruction to the control unit 11 when the writing is completed (S119: YES). Based on the conventional computer program 1P, the activated control unit 11 displays a notification of program update failure to the host device 29 and on the display of the operation unit 14 .

The flowcharts of FIGS. 4 and 5 have been described on the premise that the vehicle V is connected to the charging/discharging device 1 . When the vehicle V is not connected, the control unit 11 updates the computer program 1P without turning ON/OFF the locking of the connectors 15 and 35, stopping the operation, or the like.

In this way, even during operation, the update program is written after stopping the operation. As a result, it is possible to avoid the situation where the update timing coincides with that during driving, and thus the update cannot be performed. Also, if the program update cannot be completed due to a format error or the like, it is possible to return to the conventional computer program 1P, which has a track record of performing charging and discharging, and to return to the operation start state.

(Modification 1)
Instead of detecting a format abnormality, the control unit 11 of the charging/discharging device 1 notifies of the completion of writing when the writing is completed, and when the processing unit 40 receives the notification, a new computer program 1P is installed. It may be determined that installation is completed by judging that it is possible.

6 and 7 are flowcharts showing an example of the program update procedure of the charging/discharging device 1 in Modification 1. FIG. Among the processing procedures shown in the flowcharts of FIGS. 6 and 7, the procedures common to the processing procedures shown in the flowcharts of FIGS. 4 and 5 are assigned the same step numbers, and detailed descriptions thereof are omitted.

After starting installation of the updated computer program 1P in step S109, the processing unit 40 determines whether or not it has received a write completion notification from the control unit 11 of the charging/discharging device 1 (step S131). In step S<b>131 , the processing unit 40 determines whether or not a write completion notification has been received within a preset time (time to complete writing).

If it is determined that the writing completion notification has been received (S131: YES), the process proceeds to step S112 assuming that the writing has been completed normally.

If it is determined that the writing completion notification has not been received (S131: NO), the process proceeds to step S118 assuming that the writing could not be performed normally.

(Modification 2)
In Modified Example 2, it is checked whether or not a power failure has occurred. 8 and 9 are flowcharts showing an example of the program update procedure of the charging/discharging device 1 in Modification 2. FIG. Among the processing procedures shown in the flowcharts of FIGS. 8 and 9, the procedures that are common to the processing procedures shown in the flowcharts of FIGS. 4 and 5 are assigned the same step numbers, and detailed descriptions thereof are omitted.

Before and after step S103, when it is determined that the host device 29 is in operation (S103: YES), the processing unit 40 determines whether the power is out. (step S141). Whether or not there is a power outage corresponds to whether or not the power supply from the power system E is stopped. The processing unit 40 may determine whether or not the power supply is stopped, including not only the power system E but also the power supply from the DC power network if it is connected to the DC power network. In step S<b>141 , the processing unit 40 may determine whether or not the power failure is in progress by determining whether or not the charging/discharging device 1 is operating with the start-up storage battery of the power supply unit 13 . Alternatively, the processing unit 40 may determine whether or not the connected vehicle V is discharging.

If it is determined in step S141 that the power is out (S141: YES), the processing unit 40 determines whether or not the vehicle V is discharging (step S142). If the vehicle V is discharging electricity (S142: YES), there is a possibility that the electric power from the vehicle V is used to move loads in the area due to a power outage. Therefore, in this case, the processing unit 40 terminates the processing without updating.

If it is determined in step S141 that the power is out (S141: YES), the process may be terminated without updating regardless of whether or not the power is being discharged. This is because it is unknown at what timing the discharge is instructed during a power failure. If it is determined in step S141 that there is a power outage (S141: YES), the processing unit 40 suspends the update, that is, stores that the update process is in a standby state in the memory. The update may be completed by executing the processes after S104.

Omitting the determination of whether or not the battery is in operation in step S103, it is determined whether the power failure and discharge is in progress. You may perform the process (S104) which stops charge/discharge.

If it is determined in step S142 that the processing unit 40 is not discharging (S142: NO), the power supply from the storage battery of the power supply unit 13 or the power supply from the power storage device 30 of the vehicle V is used to perform the update in the processes after step S104. Run. When executing the update by power supply from the power storage device 30 of the vehicle V, the processing unit 40 needs to turn the locking OFF of the connectors 15 and 35 in step S105 into the locking ON.

If it is determined in step S141 that there is no power outage (S141: NO), the processing unit 40 advances the process to step S104.

If it is determined that the vehicle is not in operation (S103: NO), the processing unit 40 advances the process to step S105. power supply to perform the update. In addition, in the case of updating by supplying electric power from the power storage device 30 of the vehicle V, it is necessary to turn the locking OFF of the connectors 15 and 35 in step S105 to the locking ON conversely, as described above.

In this way, during a power failure, the operation is not stopped especially during discharging from the power storage device 30 of the vehicle V, and the update to the new computer program 1P can be executed even if the operation is stopped otherwise.

(Modification 3)
In Modified Example 3, if the charging/discharging device 1 is not operated according to an instruction from the host device 29, it returns to the original operating state (charging or discharging) after the update. 10 and 11 are flowcharts showing an example of the program update procedure of the charging/discharging device 1 according to Modification 3. FIG. Among the processing procedures shown in the flowcharts of FIGS. 10 and 11, the procedures that are common to the processing procedures shown in the flowcharts of FIGS. 4 and 5 are assigned the same step numbers, and detailed description thereof will be omitted.

In the third modification, the processing unit 40 causes the charging/discharging device 1 to establish a communication connection with the in-vehicle charging/discharging control device 32 in step S117, and then the operation before stopping in step S104 ( charging or discharging) is started (step S151), and the program update process ends.

As a result, it is possible to immediately update the program of the charging/discharging device 1 and continue the operation.

(Second embodiment)
In the second embodiment, an inquiry is made to the owner or administrator of the charging/discharging device 1 as to whether updating of the computer program 1P can be executed. The configuration of the charging/discharging system 200 in the second embodiment is the same as in the first embodiment, except for the update processing procedure described below. is omitted.

12 and 13 are flowcharts showing an example of the program update procedure of the charging/discharging device 1 according to the second embodiment. Among the processing procedures shown in the flowcharts of FIGS. 12 and 13, the procedures that are common to the processing procedures shown in the flowcharts of FIGS. 4 and 5 of the first embodiment are denoted by the same step numbers, and detailed descriptions thereof will be provided. omitted.

If it is determined that it is time to update in step S102 (S102: YES), the processing unit 40 inquires of the owner or manager of the charging/discharging device 1 whether updating is possible (step 161). In step S161, the processing unit 40 causes the display of the operation unit 14 of the charging/discharging device 1 to display a message inquiring whether the update is possible or not, and accepts whether the update is possible or not by the touch panel or physical buttons incorporated in the display.

In step S<b>161 , the processing unit 40 may instruct the server device 5 to send an inquiry message to the client device 6 . Since communication with the carrier communication network N2 is possible, a message (e-mail or message application) may be sent directly to the client device 6. FIG. Further, in step S151, the processing unit 40 may perform the processing based on the setting of whether to inquire of the owner or the administrator prestored in the storage unit 43 in a rewritable manner.

The processing unit 40 determines whether updating is possible in response to the inquiry of step S161 (step S162). In step S<b>162 , the processing unit 40 determines yes when an area on the display corresponding to yes or a physical button is selected from the operation unit 14 of the charging/discharging device 1 . Alternatively, if the operation accepted by the client device 6 in response to the message to the client device 6 (notification screen provided from the server device 5) is "select yes", it is determined to be yes.

Regarding the processing of steps S161 and S162, a setting as to whether or not to execute without inquiry is received in advance from the owner or administrator and stored in the storage unit 43. may be executed if it is set.

If it is determined in step S162 that the update is possible (S162: YES), the processing unit 40 advances the process to step S104, stops the operation if it is in operation (S104), and locks the connectors 15 and 35. If so, the lock is released (S105) and update processing is executed. It is preferable that the processing unit 40 stores the state before the update (whether or not the vehicle was in operation, the locked state, etc.) in the memory, and restores the state before the update after the update is completed. When the operation is stopped, it remains stopped, and when it is in operation based on the instruction from the host device 29, it is in the standby state until the instruction comes, and it is charging without based on the instruction from the host device 29. If so, you should restart charging.

If it is determined in step S152 that the update is not possible (S162: NO), the processing unit 40 terminates the program update process as it is.

In this way, even if the vehicle is not in operation, it is possible to inquire of the owner or manager about whether or not the battery can be updated, and then perform the update. is. In addition, when the prohibition of update is selected more than a predetermined number of times, the communication device 4 or the server device 5 prompts the owner or administrator to change the update timing, or notifies the owner or administrator of a message recommending the update. You may do so.

(Third embodiment)
If an error occurs after starting the operation with the updated program, the conventional computer program 1P with a proven track record of charging and discharging is restored. The configuration of the charging/discharging system 200 in the third embodiment is the same as the configuration in the first embodiment except that the processing contents described below are added. detailed description is omitted.

After the update of the computer program 1P is successful and the operation of the charging/discharging device 1 is resumed, the communication device 4 transmits a request for a new update program to the server device 5, and then continuously performs the following processing. For example, it is performed each time charging and discharging are performed.

FIG. 14 is a flow chart showing an example of a program monitoring processing procedure in the communication device 4. As shown in FIG. The processing unit 40 determines whether or not an error has been detected in charging/discharging in the charging/discharging device 1 (step S201). If it is determined that no error has occurred (S201: NO), the processing unit 40 ends the process.

When it is determined that an error has occurred in step S201 (S201: YES), the processing unit 40 identifies the version information of the computer program 1P that is the source of the processing of the charging/discharging device 1 that is performing charging/discharging. (Step S202). The processing unit 40 stops the operation of the charging/discharging device 1 (abnormal stop) (step S203), and turns off the lock between the connector 15 and the connector 35 (step S204).

The processing unit 40 causes the host communication unit 16 to transmit a program update start notification to the host device 29 (step S205). The processing unit 40 displays a program update start notification message on the display of the operation unit 14 (step S206).

The processing unit 40 reads out the conventional computer program 1P that has a track record of performing charging and discharging normally, stored in the storage unit 43 (step S207). The processing unit 40 starts reinstalling (writing to the memory) the read conventional computer program 1P (step S208). Specifically, in the process of step S208, the processing unit 40 transmits the computer program 1P from the second communication unit 42 to the charging/discharging device 1 by FTP.

The processing unit 40 determines whether the reinstallation is completed (step S209). If it is determined in step S209 that the reinstallation is not completed (S209: NO), the processing unit 40 returns the process to step S209.

If it is determined in step S209 that the reinstallation has been completed (S209: YES), the processing unit 40 causes the host communication unit 16 to transmit a program update completion notification to the host device 29 (step S210). The processing unit 40 displays a program update completion notification message on the display of the operation unit 14 (step S211). In steps S210 and S211, the processing unit 40 may transmit the version information in association with it, and transmit and display that the writing of the conventional computer program 1P is completed. In steps S210 and S211, when the writing is completed (S209: YES), the processing unit 40 sends a boot instruction to the control unit 11 to implement.

In order to carry out charging/discharging under the control of the host device 29, the processing unit 40 turns on the locking of the connector 15 and the connector 35 in the charging/discharging device 1 (step S212). The processing unit 40 establishes a communication connection with the in-vehicle charge/discharge control device 32 of the vehicle V (step S213) and puts it in a standby state.

The processing unit 40 transmits to the server device 5 a reinstallation completion notification including the version information of the computer program 1P in which the occurrence of the error identified in step S202 is detected and the version information of the reinstalled conventional computer program 1P. (step S214). The processing unit 40 stores the installation history log (step S215), and terminates the process.

As a result, in the charging/discharging device 1 updated to the latest computer program 1Pv1, if a problem based on the latest computer program 1P or an error occurs due to an individual event and charging/discharging cannot be performed, the conventional computer It is possible to return to program 1Pv0 and continue charging and discharging.

When the server device 5 receives notification of the occurrence of a problem from a plurality of communication devices 4, it can be notified to the administrator of the server device 5 to verify the updated computer program 1P.

(Fourth embodiment)
In the fourth embodiment, the communication device 4 collects data and sends it to the server device 5 . The configuration of the charging/discharging system 200 in the fourth embodiment is the same as the configuration in the first embodiment except that the processing contents described below are added. detailed description is omitted.

FIG. 15 is a flow chart showing an example of a data transmission processing procedure by the communication device 4 according to the fourth embodiment. The communication device 4 may continuously execute the following processing procedure while being activated by being supplied with power from the charging/discharging device 1, or once a day, once a week, or the like. The following processing procedures may be executed at preset timings. The processing procedure shown in the following flow chart may be executed independently by the control unit 11 of the charging/discharging device 1 instead of by the communication device 3 .

The processing unit 40 of the communication device 4 determines whether or not the charging/discharging device 1 has started operation (step S301). When it is determined in step S301 that the operation is not started (S301: NO), the processing unit 40 returns the process to step S301 and waits until the operation is started.

When it is determined that the operation has started (S301: YES), the processing unit 40 specifies whether it is charging or discharging (step S302), and determines whether charging/discharging has been switched (step S303). . When it is determined that charging and discharging are not switched (S303: NO), the processing unit 40 determines whether or not the operation has stopped (step S304).

If it is determined that the operation is not stopped (S304: NO), the processing unit 40 acquires data on the operating state of the charging/discharging device 1 from the charging/discharging device 1 while charging or discharging is being performed. , is stored (step S305). In step S<b>305 , the processing unit 40 acquires power such as the number of revolutions of the fan in the charging/discharging circuit 10 . The processing unit 40 returns the processing to step S303.

When it is determined that charging and discharging have switched (S303: YES), the processing unit 40 identifies and stores the charging or discharging time that has been performed so far (step S306). The processing unit 40 proceeds to step S305.

When it is determined that the operation has stopped (S304: YES), the processing unit 40 transmits the stored data regarding the operation of the charging/discharging device from the start to the end of the operation to the server device 5 to identify the charging/discharging device 1. data (identification data of the communication device 4) to be transmitted (step S307). After transmitting the data, the processing unit 40 ends the processing.

By adding the communication device 4 to the charging/discharging device 1 in this manner, charging/discharging data can be collected and transmitted to the server device 5 for collection. By transmitting data such as the number of revolutions of the fan indicating the operating state of the charging/discharging device 1 to the server device 5, the server device 5 creates data for observing the operation history of each charging/discharging device 1 in chronological order. can be done. For preventive maintenance of the charging/discharging device 1, the owner, administrator, or maintenance staff of the charging/discharging device 1 can confirm these data.

Maintenance workers do not need to go to the site to update the program of charging/discharging device 1, and maintenance workers can visit the installation location of charging/discharging device 1 only when a failure of charging/discharging device 1 is foreseen. It is possible to improve the efficiency of the maintenance work such as "just do it".

Since the data of the operating state of the charging/discharging device 1 can be collected by the server device 5, it is possible to analyze the characteristics of the operating situation of the charging/discharging device 1 to which an unspecified number of vehicles V are connected. , it is expected that the data necessary for optimization will be utilized.

Further, the communication device 4 may be provided with sensors for acquiring environmental data (temperature, humidity, weather, etc.), and the data acquired by these sensors may be transmitted to the server device 5 together with the operation data of the charging/discharging device 1 . An unspecified number of vehicles V are connected to the charging/discharging device 1 . If each vehicle type of the vehicle V can be identified, the server device 5 may collect data indicating driving conditions in charging and discharging for each vehicle type. By enabling the server device 5 to collect the charging/discharging data of the charging/discharging device 1 and various sensors in association with each other, it is expected that the data required for proper operation and optimization of V2X will be utilized.

(Fifth embodiment)
In the fifth embodiment, the communication device 4 performs processing on multiple charging/discharging devices 1 . FIG. 16 is a schematic diagram of a charging/discharging system 200 in the second embodiment.

As shown in FIG. 16, in the fifth embodiment, one communicator 4 is provided for a plurality of charging/discharging devices 1 installed in the same facility at the same location, even if the program is updated. good. In this case, the charging/discharging device 1 is connected to the same communication device 4 by each server communication unit 17 via wire or wireless. Since the configurations of the charging/discharging device 1 and the communication device 4 themselves are the same as those of the first embodiment, they are denoted by the same reference numerals and detailed description thereof is omitted.

Since the communication device 4 functions as a gateway, in the fifth embodiment, it is possible to perform the same processing as in the first embodiment by identifying each of the plurality of charging/discharging devices 1 with identification data. . The communication device 4 may execute the processing procedure shown in the flowcharts of FIGS. 4 and 5 of the first embodiment for the plurality of charging/discharging devices 1 sequentially or in parallel.

By using one communication device 4 for a plurality of charging/discharging devices 1, the number of communication devices 4 can be minimized and the cost can be reduced. The processing shown in the second to fourth embodiments can also be executed in the fifth embodiment. Any one of the plurality of charging/discharging devices 1 may be set as a master, and the update timing setting for the master charging/discharging device 1 may be applied to the other charging/discharging devices 1 . When the occurrence of an error is detected in the master charging/discharging device 1, control such as re-installation of the conventional computer program 1P to a plurality of charging/discharging devices 1 installed at the same location may be performed.

Data may be collected for a plurality of charging/discharging devices 1 installed at the same place or facility, as shown in the fourth embodiment. It is expected that the collection of data at the same place or facility will be utilized for appropriate charge/discharge control according to the demand and supply of electric power according to the usage environment.

The embodiments disclosed as described above are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims, and includes all modifications within the meaning and scope of equivalence to the scope of claims.

REFERENCE SIGNS LIST 1 charge/discharge device 10 charge/discharge circuit 11 control unit 12 vehicle communication unit 14 operation unit 16 host communication unit 1P computer program V vehicle 29 host device 4 communication device (update processing unit)
40 processing unit 43 storage unit 4P control program 5 server device 6 client device

Claims (13)

A charging/discharging device that is connected to a commercial power source or a DC power network via a power line, has a connector with an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle, and controls charging and discharging of the on-vehicle storage battery,
a communication unit that performs communication via a communication network;
a storage unit that rewritably stores a computer program related to charge/discharge control;
an update processing unit that updates the computer program,
The update processing unit
receiving an updated computer program from the communication unit;
When the charging/discharging device is in charge/discharge operation, stopping the charge/discharge operation;
A charging/discharging device that rewrites the computer program in the storage unit with the received computer program after the operation is stopped. Equipped with a save storage unit for saving the computer program before update,
The update processing unit
2. The charging/discharging device according to claim 1, wherein when charging/discharging control has been executed in the computer program before rewriting of the storage unit, the program is saved in the saving storage unit and then rewritten. Determining whether an error has occurred in the control of charging and discharging based on the rewritten computer program,
If it is determined that an error has occurred, the charging/discharging operation is stopped,
The charging/discharging device according to claim 2, wherein the computer program stored in the storage unit is rewritten with the pre-update computer program stored in the storage storage unit. 4. The charging/discharging device according to any one of claims 1 to 3, wherein the update processing unit restarts the stopped operation after rewriting of the computer program is completed. The update processing unit
Determining whether the power supply from the commercial power source or the DC power grid has stopped,
5. The charging/discharging device according to any one of claims 1 to 4, wherein, when it is determined that the charging/discharging device has stopped, the update by the received updated computer program is waited until the power supply is restored. The update processing unit
Determining whether the power supply from the commercial power source or the DC power grid has stopped,
5. The charging/discharging device according to any one of claims 1 to 4, wherein when it is determined that the computer program has stopped, updating is prohibited even if an updated computer program has been received. When the power supply from the commercial power supply or the DC power network is stopped, determining whether or not the on-vehicle storage battery is discharging,
If it is determined that it is discharging, it will not be possible to update,
The charging/discharging device according to claim 6, wherein updating is performed when it is determined that the battery is not being discharged. The update processing unit
When receiving an updated computer program from the communication unit, accepting whether the update is possible,
8. The charging/discharging device according to any one of claims 1 to 7, wherein, when update is accepted, charging/discharging operation is stopped and rewriting is executed. The update processing unit
Acquiring data on the operating state of the charging/discharging device,
The charge/discharge device according to any one of claims 1 to 8, wherein the acquired data is transmitted from the communication unit. a charging/discharging device that is connected to a commercial power source or a DC power network via a power line, has a connector with an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle, and controls charging and discharging of the on-vehicle storage battery; a communication device communicatively connected to the discharge device;
The communicator is
a communication unit that performs communication via a communication network;
a storage unit that rewritably stores a computer program for controlling the charging/discharging device;
an update processing unit that updates the computer program,
The update processing unit
receiving an updated computer program from the communication unit;
When the charging/discharging device is in charge/discharge operation, stopping the charge/discharge operation;
A charge/discharge control system that rewrites a computer program related to control of the charge/discharge device with a received computer program after operation is stopped. The communication device is connected for communication with a plurality of the charging/discharging devices,
The communicator is
11. The charging/discharging control system according to claim 10, wherein rewriting of a program by a received computer program is executed sequentially or in parallel for the plurality of charging/discharging devices. A program for a charging/discharging device that is connected to a commercial power source or a DC power network via a power line, has a connector for an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle, and controls charging and discharging in the on-vehicle storage battery. A method of rewriting,
receiving a computer program updated by a communication unit that performs communication over a communication network;
When the charging/discharging device is in charge/discharge operation, stopping the charge/discharge operation;
A program rewriting method including a process of rewriting a computer program related to charge/discharge control with a received computer program after operation is stopped. A computer of a charging/discharging device connected to a commercial power supply or a DC power network via a power line and having a connector for an on-vehicle power line that connects to an on-vehicle storage battery provided in a vehicle,
receiving a computer program updated by a communication unit that performs communication over a communication network;
When the charging/discharging device is in charge/discharge operation, stopping the charge/discharge operation;
A computer program that rewrites a computer program related to charge/discharge control with a computer program that has already been received after operation is stopped.

Images