JP2021058006A - Charge/discharge control device of power storage device - Google Patents

Abstract

To provide a charge/discharge control device of a power storage device, which can reduce useless power consumption and avoid a shortage of the remaining charged amount of the power storage device.SOLUTION: A charge/discharge control device of a power storage device is chargeably/dischargeably connected with a drive source of a vehicle, comprises: a charge/discharge control part which controls charge and discharge of a battery; a destination information acquisition part which acquires destination information of the vehicle; and a standing time estimation part which estimates standing time of the vehicle at a destination on the basis of the destination information, in which the charge/discharge control part executes adjustment discharge control for discharging the battery during travel of the vehicle on condition that the standing time is first predetermined time or longer and SOC of the battery is an upper limit value or higher, and executes adjustment charge control for charging the battery during the travel of the vehicle on condition that the standing time is the first predetermined time or longer and the SOC of the battery is a lower limit value or lower.SELECTED DRAWING: Figure 4

Description

The present invention relates to a charge / discharge control device for a power storage device.

According to Patent Document 1, when the control unit that controls the storage battery detects the interruption of electrical input / output to the storage battery as a vehicle power storage device mounted on the vehicle, it is based on the leaving time information regarding the leaving time of the vehicle. Those configured to control the discharge and charge of the storage battery are disclosed.

According to the vehicle power storage device described in Patent Document 1, discharge / charge control can be executed under conditions commensurate with the vehicle's leaving time information, and it is possible to suppress an increase in power consumption while suppressing deterioration of the storage battery. Become.

JP-A-2018-160971

However, in the above-mentioned conventional power storage device for vehicles, the information on the leaving time of the vehicle is acquired when the ignition is off, and when the detection voltage of the storage battery exceeds the target voltage, the discharge process is performed. There is wasteful power consumption that is discharged by the discharge process.

Further, in the above-mentioned conventional power storage device for vehicles, no consideration is given to measures when the remaining charge of the storage battery is insufficient when the vehicle is left unattended.

As described above, in the conventional power storage device for vehicles, there is still room for improvement in charge / discharge management of the storage battery in order to reduce wasteful power consumption and avoid insufficient charge remaining amount of the storage battery. ..

The present invention has been made in view of the above circumstances, and is a charge / discharge control device for a power storage device that can reduce unnecessary power consumption and avoid a shortage of the remaining charge of the storage battery. The purpose is to provide.

The present invention is a charge / discharge control device for a power storage device that is connectable to a drive source of a vehicle so as to be able to charge / discharge, and a charge / discharge control unit that controls charging and discharging of the power storage device. The time when the vehicle is left at the destination indicated by the destination information based on the destination information acquisition unit that acquires the destination information of the vehicle and the destination information acquired by the destination information acquisition unit. The charge / discharge control unit is provided with a leaving time estimation unit for estimating the leaving time, provided that the leaving time is a predetermined time or more and the remaining amount of the power storage device is an upper limit value or more. On the condition that the adjusted discharge control for discharging while the vehicle is running is executed, the leaving time is a predetermined time or more, and the remaining amount of the power storage device is not more than the lower limit value, the vehicle is running. It has a configuration that executes adjustment charge control to charge the battery.

According to the present invention, it is possible to provide a charge / discharge control device for a power storage device that can reduce unnecessary power consumption and avoid a shortage of the remaining charge of the storage battery.

FIG. 1 is a schematic configuration diagram of a vehicle equipped with a charge / discharge control device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a flow of charge / discharge control processing executed by the charge / discharge control device according to the embodiment of the present invention. FIG. 3 is a diagram for explaining the upper limit and the lower limit of the SOC management range of the battery mounted on the vehicle according to the embodiment of the present invention. FIG. 4 is a timing chart when performing adjusted discharge control and adjusted charge control by the charge / discharge control device according to the embodiment of the present invention.

The charge / discharge control device for the power storage device according to the embodiment of the present invention is a charge / discharge control device for the power storage device that is connectable to the drive source of the vehicle so that the power storage device can be charged and discharged. The vehicle is left at the destination indicated by the destination information based on the charge / discharge control unit, the destination information acquisition unit that acquires the destination information of the vehicle, and the destination information acquired by the destination information acquisition unit. The charge / discharge control unit is provided with a leaving time estimation unit that estimates the leaving time, which is the time to be left, provided that the leaving time is a predetermined time or more and the remaining amount of the power storage device is an upper limit value or more. Adjustment to perform discharge while the vehicle is running Adjustment to perform charging while the vehicle is running, provided that the discharge time is at least a predetermined time and the remaining amount of the power storage device is below the lower limit. It is characterized by performing charge control. As a result, the charge / discharge control device of the power storage device according to the embodiment of the present invention can reduce unnecessary power consumption and can avoid a shortage of the remaining charge of the storage battery.

Hereinafter, a vehicle equipped with a charge / discharge control device for a power storage device according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vehicle 1 according to the present embodiment includes an engine 2, a motor generator 3, an inverter 4, a battery 5 as a power storage device, an external charge connection unit 6, and a charge / discharge control device 10. , Is included.

The engine 2 and the motor generator 3 form a drive source for the vehicle 1. The vehicle 1 is a plug-in hybrid vehicle that is configured to be able to travel by the power of at least one of the engine 2 and the motor generator 3 and has an external charging function.

The vehicle 1 may be a so-called range extender in which the motor generator 3 is used as the drive source of the vehicle 1 and the motor generator 3 is driven by using the electric power generated by driving the generator (not shown) by the engine 2.

The motor generator 3 is connected to the battery 5 via the inverter 4. The inverter 4 converts the DC power of the battery 5 into AC power and supplies it to the motor generator 3, or converts the AC power generated by the motor generator 3 into DC power and charges the battery 5.

The battery 5 is made of a secondary battery such as a lithium ion battery. The battery 5 is provided with a battery sensor 5a. The battery sensor 5a detects the charge / discharge current and voltage of the battery 5 and outputs the charge / discharge control device 10. The charge / discharge control device 10 calculates the remaining charge of the battery 5, that is, the SOC (State Of Charge), based on the detection result input from the battery sensor 5a.

The external charging connection unit 6 is composed of a charger that can be connected to the external charging equipment 30. Examples of the external charging equipment 30 include a charging station and a parking lot where a household power source can be used.

The charge / discharge control device 10 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory for storing backup data, an input port, and an output port. It is composed of a computer unit equipped with.

The ROM of the computer unit stores various constants, various maps, and the like, as well as a program for making the computer unit function as the charge / discharge control device 10. That is, when the CPU executes the program stored in the ROM using the RAM as the work area, the computer unit functions as the charge / discharge control device 10 in this embodiment.

Various devices such as a motor generator 3 and an inverter 4 are connected to the charge / discharge control device 10. The charge / discharge control device 10 has a function as a charge / discharge control unit 11 that controls charging and discharging of the battery 5 by controlling the motor generator 3 and the inverter 4.

Further, various input devices such as the battery sensor 5a, the destination information input unit 20, and the current position information input unit 21 described above are connected to the charge / discharge control device 10.

The destination information input unit 20 and the current position information input unit 21 are inputs that can be input and operated by a user, such as a car navigation system mounted on a vehicle or a terminal such as a smartphone incorporating an application program having the same function as the car navigation system. It is composed of devices.

Based on the destination input by the user, the destination information input unit 20 includes the destination, which is location information, facility information of the destination, whether the destination is equipped with an external charging facility 30, and the like. Information related to is transmitted to the charge / discharge control device 10 as destination information.

The charge / discharge control device 10 has a function as a destination information acquisition unit 12 that acquires destination information transmitted from the destination information input unit 20. When the destination information acquisition unit 12 is predicted to go to a predetermined destination from the past travel route of the vehicle 1 in addition to the destination input by the user via the destination information input unit 20. May acquire the destination of the prediction as destination information.

The charge / discharge control device 10 estimates the leaving time, which is the time when the vehicle 1 is left at the destination indicated by the destination information, based on the destination information acquired by the destination information acquisition unit 12. It has a function as a unit 13.

The charge / discharge control device 10 estimates the leaving time with reference to a destination or a leaving time estimation map (not shown) in which a leaving time assigned in advance for the type of the destination is defined. ..

The types of destinations are stores such as shopping malls and convenience stores, restaurants such as restaurants, health facilities such as hospitals and nursing care facilities, public facilities such as government offices, accommodation facilities such as hotels and inns, and users such as homes and companies. It shows each genre when the destinations are roughly classified by type, such as facilities. Of these types, for example, stores, restaurants, health facilities, public facilities, etc. are not places where vehicles are left for a long period of time, so relatively short leaving time is allocated. On the other hand, accommodation facilities, user facilities, and the like are likely to leave the vehicle for a long period of time, so that a relatively long time is allocated.

The current position information input unit 21 acquires the current position of the vehicle 1 by, for example, GPS (Global Positioning System), and transmits the acquired current position of the vehicle 1 to the charge / discharge control device 10. The means for acquiring the current position of the vehicle 1 is not limited to GPS, and other means may be used.

The charge / discharge control device 10 has a function as a current position acquisition information acquisition unit 14 that acquires the current position transmitted from the current position information input unit 21.

Next, with reference to FIG. 2, the charge / discharge control process executed by the charge / discharge control device 10 according to the present embodiment will be described. The charge / discharge control process shown in FIG. 2 is repeatedly executed at predetermined time intervals from the time when the ignition of the vehicle 1 is turned on to the time when the ignition is turned off.

As shown in FIG. 2, the charge / discharge control device 10 acquires the destination information transmitted from the destination information input unit 20 (step S1). After that, the charge / discharge control device 10 estimates the leaving time of the vehicle 1 at the destination based on the destination information acquired in step S1, and determines whether or not the estimated leaving time is equal to or longer than a predetermined time (step). S2). The predetermined time is set to, for example, about half a day (12 hours).

When the charge / discharge control device 10 determines in step S2 that the leaving time is not longer than a predetermined time, the charge / discharge control ends the charge / discharge control. When the charge / discharge control device 10 determines in step S2 that the leaving time is longer than a predetermined time, the charge / discharge control device 10 acquires the current position transmitted from the current position information input unit 21 (step S3).

Next, the charge / discharge control device 10 determines whether or not the distance from the current position of the vehicle 1 to the destination, that is, the remaining distance to the destination is equal to or less than the first predetermined distance (step S4). When the charge / discharge control device 10 determines in step S4 that the remaining distance to the destination is not equal to or less than the first predetermined distance, the charge / discharge control device 10 returns the process to step S3 and repeats the processes after step S3. Therefore, in this embodiment, the adjusted discharge control and the adjusted charge control described later are not executed until the remaining distance to the destination is equal to or less than the first predetermined distance.

When the charge / discharge control device 10 determines in step S4 that the remaining distance to the destination is equal to or less than the first predetermined distance, whether or not the remaining distance to the destination is equal to or less than the second predetermined distance. Is determined (step S5). Here, the second predetermined distance is smaller than the first predetermined distance.

When the charge / discharge control device 10 determines in step S5 that the remaining distance to the destination is not less than or equal to the second predetermined distance, the charge / discharge control device 10 compares the first upper limit value with the current SOC in step S11 described later. , And the first lower limit value is set as the lower limit value to be compared with the current SOC in step S9 described later (step S6).

Here, the first upper limit value is a value smaller than the deterioration upper limit value of the battery 5, and the first lower limit value is a value larger than the deterioration lower limit value of the battery 5. The deterioration upper limit value is an SOC upper limit value in which the battery 5 may be deteriorated if the battery is charged further. The lower limit of deterioration is the lower limit of SOC in which the battery 5 may be deteriorated if discharged further.

When the charge / discharge control device 10 determines in step S5 that the remaining distance to the destination is equal to or less than the second predetermined distance, the charge / discharge control device 10 compares the second upper limit value with the current SOC in step S11 described later. It is set as a value, and the second lower limit value is set as a lower limit value to be compared with the current SOC in step S9 described later (step S7). Here, the second upper limit value is a value smaller than the above-mentioned deterioration upper limit value and larger than the first upper limit value. The second lower limit value is a value larger than the above-mentioned deterioration lower limit value and smaller than the first lower limit value.

The charge / discharge control device 10 then calculates the current SOC of the battery 5 (step S8). Then, the charge / discharge control device 10 determines whether or not the current SOC is equal to or less than the lower limit value (step S9).

When the charge / discharge control device 10 determines in step S9 that the current SOC is equal to or lower than the lower limit value, the charge / discharge control device 10 executes adjusted charge control for charging while the vehicle 1 is running (step S10), and steps the process. The process returns to S5, and the processes after step S5 are repeated. In the adjusted charge control, the motor generator 3 is regeneratively driven so that the current SOC exceeds the lower limit value.

The charge / discharge control device 10 prohibits the above-mentioned adjustment charge control when it is known that the external charging facility 30 is provided at the destination based on the destination information acquired in step S1. ..

When the charge / discharge control device 10 determines in step S9 that the current SOC is not equal to or less than the lower limit value, the charge / discharge control device 10 determines whether or not the current SOC is equal to or greater than the upper limit value (step S11). When the charge / discharge control device 10 determines in step S11 that the current SOC is equal to or higher than the upper limit value, the charge / discharge control device 10 executes adjusted discharge control for discharging while the vehicle 1 is running (step S12), and steps the process. The process returns to S5, and the processes after step S5 are repeated.

In the adjusted discharge control, the motor generator 3 is forced to run, the auxiliary machinery mounted on the vehicle 1 is operated, and the power consumption of the auxiliary machinery is increased.

When the charge / discharge control device 10 determines in step S11 that the current SOC is not equal to or higher than the upper limit value, the charge / discharge control device 10 determines whether or not the vehicle 1 has arrived at the destination (step S13). The charge / discharge control device 10 can determine whether or not the vehicle 1 has arrived at the destination from the current position transmitted from the current position information input unit 21, for example. The charge / discharge control device 10 may determine that the vehicle 1 has arrived at the destination, for example, when the ignition or the vehicle start switch is turned off.

When the charge / discharge control device 10 determines in step S13 that the vehicle 1 has not arrived at the destination, the charge / discharge control device 10 returns the process to step S5 and repeats the processes after step S5. When it is determined in step S13 that the vehicle 1 has arrived at the destination, the charge / discharge control device 10 ends the charge / discharge control.

In this way, after the remaining distance to the destination is equal to or less than the first predetermined distance, the charge / discharge control device 10 manages the SOC of the battery 5 with the above-mentioned upper limit value and lower limit value as the upper limit and the lower limit, respectively. I try to keep it within the range.

Next, with reference to FIG. 3, the transition of the upper limit value and the lower limit value according to the remaining distance to the destination will be described. It is not limited to this. In the example shown in FIG. 3, the first predetermined distance will be 10 km, and the second predetermined distance will be 5 km. Each numerical value shown in FIG. 3 is an example, and is an example.

As shown in FIG. 3, when the remaining distance to the destination is 10 km, which is the first predetermined distance, the first upper limit value “70” is set as the upper limit value, and the first lower limit value “30”. Is set as the lower limit.

After that, when the remaining distance to the destination reaches 5 km, which is the second predetermined distance, the second upper limit value "75" is set as the upper limit value, and the second lower limit value "25" is set as the lower limit value. .. When the destination arrives, the deterioration upper limit value "80" is set as the upper limit value, and the deterioration lower limit value "20" is set as the lower limit value.

Here, the charge / discharge control device 10 may correct the lower limit value so that the lower limit value becomes larger as the leaving time at the destination becomes longer. For example, as shown in FIG. 3, when the number of days left unattended is estimated to be 10 days, the lower limit value of "20" is corrected to "30". This correction amount may be changed according to the leaving time and the number of days left.

Next, the operation of the charge / discharge control device 10 of this embodiment will be described with reference to FIG. The upper limit of SOC in FIG. 4 is the above-mentioned upper limit value, and the lower limit of SOC is the above-mentioned lower limit value. Further, “α1” in FIG. 4 is the first predetermined distance described above. “Full” in FIG. 4 is the upper limit of management of the battery 5, and “E” is the lower limit of management of the battery 5.

As shown in FIG. 4, until the remaining distance to the destination is α1 or less, the adjusted discharge control and the adjusted charge control are not executed even if the SOC exceeds the upper limit or falls below the lower limit.

After the remaining distance to the destination is α1 or less, the adjusted charging control is executed when the SOC becomes equal to or less than the lower limit, and then the adjusted charging control ends when the SOC reaches the upper limit. Further, when the SOC becomes equal to or higher than the upper limit, the adjusted discharge control is executed, and then when the SOC falls below the upper limit, the adjusted discharge control ends.

As described above, in the charge / discharge control device of the power storage device according to the present embodiment, the leaving time of the vehicle 1 at the destination is equal to or longer than the first predetermined time, and the SOC of the battery 5 is equal to or higher than the upper limit value. The condition is that the adjusted discharge control for discharging the vehicle 1 while the vehicle 1 is running is executed, the leaving time of the vehicle 1 at the destination is equal to or longer than the first predetermined time, and the SOC of the battery 5 is equal to or less than the lower limit value. On the condition that the vehicle 1 is running, it is configured to execute the adjusted charging control for charging the vehicle 1.

As a result, the charge / discharge control device of the power storage device according to the present embodiment can be controlled so that the SOC is within an appropriate SOC range that can suppress the deterioration of the battery 5 when arriving at the destination, which is wasteful at the destination. Discharge can be avoided. Therefore, the charge / discharge control device of the power storage device according to the present embodiment can further reduce unnecessary power consumption. Further, the charge / discharge control device of the power storage device according to the present embodiment can avoid a situation in which the SOC becomes insufficient when arriving at the destination.

Further, the charge / discharge control device of the power storage device according to the present embodiment executes at least one of the adjusted charge control and the adjusted discharge control on the condition that the remaining distance to the destination is equal to or less than the first predetermined distance. It is configured to do.

As a result, the charge / discharge control device of the power storage device according to the present embodiment does not perform charge / discharge control for suppressing battery deterioration when it is far from the destination, so that it is useless due to the adjusted charge control and the adjusted discharge control. Charging and discharging can be suppressed.

Here, it is considered that the farther the destination is, the more chances that the SOC of the battery 5 will move up and down due to the regeneration and power consumption of the motor generator 3. If the SOC is controlled between the deterioration upper limit value and the deterioration lower limit value, for example, if continuous regeneration is performed near the destination, the deterioration upper limit value is exceeded when the destination arrives. Therefore, it is possible that forced discharge will be required at the destination.

Therefore, in the charge / discharge control device of the power storage device according to the present embodiment, the longer the distance from the current position to the destination, the smaller the upper limit value and the larger the lower limit value.

Therefore, the charge / discharge control device of the power storage device according to the present embodiment can continuously regenerate by setting an upper limit value smaller than the deterioration upper limit value and a lower limit value larger than the deterioration lower limit value as the distance from the destination increases. Even if the SOC of the battery 5 temporarily exceeds the upper and lower limit values due to power consumption, charge / discharge control is executed so that it converges within the deterioration upper limit value and deterioration lower limit value when arriving at the destination. can do.

Further, the charge / discharge control device of the power storage device according to the present embodiment corrects the lower limit value so that the lower limit value becomes larger as the leaving time at the destination becomes longer. It is possible to prevent the SOC from falling below the lower limit of deterioration even when there is a concern that the amount of the discharge will decrease.

Further, the charge / discharge control device of the power storage device according to the present embodiment prohibits the adjustment charging control when the external charging facility 30 is provided at the destination, so that the user performs external charging at the destination. Unnecessary power generation can be suppressed when it can be predicted.

In this embodiment, on the premise that the estimated leaving time is longer than a predetermined time, at least one of the adjusted discharge control and the adjusted charge control is executed, but the present invention is not limited to this, for example. The charge / discharge control device 10 may be configured to execute at least one of the adjusted discharge control and the adjusted charge control when it is estimated that the vehicle 1 is left at the destination for a predetermined time or longer. In this case, since it is not necessary to estimate the leaving time for each destination, the processing load of the charge / discharge control device 10 can be reduced.

Further, in this embodiment, the configuration in which the upper limit value and the lower limit value to be compared with the current SOC in charge / discharge control are changed stepwise according to the remaining distance to the destination has been described, but the present invention is not limited to this. The upper limit value and the lower limit value may be linearly changed according to the remaining distance to the ground. In this case, it is preferable to set the upper limit value and the lower limit value so that the longer the remaining distance to the destination, the smaller the upper limit value and the larger the lower limit value.

Although the embodiments of the present invention have been disclosed, it is clear that some skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 Vehicle 2 Engine 3 Motor generator (drive source)
4 Inverter 5 Battery (power storage device)
5a Battery sensor 6 External charge connection unit 10 Charge / discharge control device 11 Charge / discharge control unit 12 Destination information acquisition unit 13 Leaving time estimation unit 14 Current position acquisition information acquisition unit 20 Destination information input unit 21 Current position information input unit 30 External Charging equipment

Claims (6)

It is a charge / discharge control device for a power storage device that is connected to the drive source of the vehicle so that it can be charged / discharged.
A charge / discharge control unit that controls charging and discharging of the power storage device,
The destination information acquisition unit that acquires the destination information of the vehicle, and
Based on the destination information acquired by the destination information acquisition unit, the vehicle is provided with an abandonment time estimation unit that estimates the abandonment time, which is the time the vehicle is abandoned at the destination indicated by the destination information.
The charge / discharge control unit
On the condition that the leaving time is a predetermined time or more and the remaining amount of the power storage device is not more than the upper limit value, the adjusted discharge control for discharging while the vehicle is running is executed.
The power storage device is characterized by executing an adjusted charging control for charging while the vehicle is running, provided that the leaving time is a predetermined time or more and the remaining amount of the power storage device is not more than the lower limit value. Charge / discharge control device. A current position information acquisition unit for acquiring the current position of the vehicle is further provided.
The charge / discharge control unit is characterized in that at least one of the adjusted charge control and the adjusted discharge control is executed on condition that the distance from the current position to the destination is equal to or less than a predetermined distance. The charge / discharge control device for the power storage device according to claim 1. The charging / discharging control unit according to claim 2, wherein the longer the distance from the current position to the destination, the smaller the upper limit value and the larger the lower limit value. Discharge control device. When the predetermined distance is set to the first predetermined distance,
The charge / discharge control unit
When the distance from the current position to the destination is equal to or less than the first predetermined distance, the first upper limit value smaller than the deterioration upper limit value of the power storage device is set as the upper limit value, and the deterioration of the power storage device is set. A first lower limit value larger than the lower limit value is set as the lower limit value, and the lower limit value is set.
When the distance from the current position to the destination is equal to or less than the second predetermined distance shorter than the first predetermined distance, it is smaller than the deterioration upper limit value of the power storage device and the first upper limit value. A second upper limit value larger than the upper limit value is set as the upper limit value, and a second lower limit value larger than the deterioration lower limit value of the power storage device and smaller than the first lower limit value is set as the lower limit value. The charge / discharge control device for the power storage device according to claim 2 or 3. The charging / discharging control unit according to any one of claims 1 to 4, wherein the lower limit value is corrected so that the lower limit value becomes larger as the leaving time becomes longer. Discharge control device. The vehicle is equipped with an external charging connection that can be connected to an external charging facility.
The charge / discharge control unit according to any one of claims 1 to 5, wherein the adjustment charge control is prohibited when the destination is provided with an external charging facility. Charge / discharge control device for power storage device.

Images