JP2009163552A - Vehicle power supply management system, vehicle power supply management apparatus and charge control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle power supply management system capable of reducing power consumption by early detecting a battery condition and reducing unnecessary communication. <P>SOLUTION: The vehicle power supply management system includes a battery 10 including a battery condition calculation part 13 for calculating information expressing its own charge state and an integrated control device 20 for controlling the charge/discharge of the battery 10. The battery 10 and the integrated control device 20 are respectively provided with external communication parts 14, 25, and the battery 10, when determining that its own charge state is changed, notifies the integrated control device 20 of the charge state through the external communication part 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for early detection of a battery state and realizing early control according to the battery state.

  In recent years, the comfortable performance of vehicles has been rapidly developed. However, on the other hand, the number of electric devices mounted on the vehicle is rapidly increasing.

Power supply to electric devices is a major role of in-vehicle batteries. In-vehicle batteries are mainly lead (Pb) batteries, and repeated charge / discharge causes battery deterioration. Therefore, optimal charge control according to the battery charge rate that does not deteriorate the battery is required. The
For example, in a vehicle that has been parked for a long time and left unattended, there is a possibility that the battery will run out due to the dark current generated by the electrical equipment. For this reason, it is necessary to cut the power supply to the electrical device that generates dark current according to the battery charge rate.
In addition, when the battery is replaced (for example, when it is replaced with a battery having a different capacity), or when the battery has deteriorated, the charging control or the power cut control corresponding to the battery capacity is performed. Must be implemented.
For this reason, a technique for detecting battery replacement or battery deterioration and notifying the vehicle controller of this is required.
Patent Documents 1 to 3 disclose a technique for providing a battery with a nonvolatile memory for storing its characteristics, and a technique for transmitting various information such as battery capacity and error information acquired by the battery to a vehicle control device. ing.

JP-A-3-277130 JP 2002-90431 A JP 2002-91548 A

  However, in the disclosed technologies of Patent Documents 1 to 3, when the battery control device and the vehicle control device communicate with each other at specific timing, the battery state is detected early and unnecessary communication is performed. It is not disclosed whether the power consumption can be reduced by reducing the power consumption.

  The present invention has been made in view of the above circumstances, and can detect a battery state at an early stage and reduce power consumption by reducing unnecessary communication, a vehicle power management device, and a vehicle power management device. An object is to provide a charge control method.

In order to achieve the above object, a power management system for a vehicle according to the present invention controls a battery having a determination unit that determines its own charge state based on a measurement value measured by a sensor unit, and charging / discharging of the battery. A vehicle power management system having a vehicle power management device, wherein the battery and the vehicle power management device each have communication means, and the battery has changed in its charge state. If it determines, it has the structure which notifies the said charge condition to the said vehicle power supply management apparatus using the said communication means.
According to the present invention, when the battery detects that the state of charge of the battery has changed, the state of charge of the battery is notified using the communication means, so the state of charge of the battery is notified to the control device at a suitable timing. In addition, power consumption can be reduced and battery status can be detected early.

In the vehicle power management system configured as described above, the vehicle power management device may include a detection unit that detects a change in a battery state and controls the battery according to a detection result of the detection unit.
Since the detection unit for detecting the change in the battery state is provided and the battery state is determined on the vehicle power management device side, the state of the battery can be grasped at a timing required for the control.

In the vehicle power management system having the above-described configuration, the detection unit may be a unit that detects a change in the state of charge of the battery based on a measurement value measured by the sensor unit.
Therefore, it is possible to accurately detect a change in the state of charge of the battery.

In the vehicle power management system with the above configuration, the detection unit may be a unit that detects the removal of the battery from the vehicle.
Therefore, it is possible to detect that the battery has been removed from the vehicle and reflect it in the charging control by the vehicle power management device.

In the vehicle power management system having the above-described configuration, the detection unit can detect the removal of the battery from the vehicle depending on whether or not the keyword written in the memory is broken.
Therefore, it is possible to accurately detect the removal of the battery from the vehicle.

In the vehicle power management system having the above-described configuration, the communication unit may employ a configuration in which power is turned off except during communication.
Therefore, useless power consumption can be reduced.

  The vehicle power management device of the present invention is a vehicle power management device that controls charging / discharging of a battery having storage means for storing its own charge state, and is a first communication for communicating with the battery. And a second communication means for communicating with the vehicle-mounted control device different from the battery, and a power cutoff means for shutting off the power of the first communication means when communication with the battery is not required And the second communication means is configured to be able to communicate with the in-vehicle control device while the power supply of the first communication means is cut off by the power cut-off means. The

  The charging control method of the present invention includes a step of determining a change in its charge state in a battery mounted on a vehicle, and a vehicle power source that controls charging and discharging of the battery when the charge state is changed. And a step of notifying the management device of a change in the state of charge using a communication means, and the vehicle power management device including a step of controlling the battery according to the change in the state of charge. ing.

  In the above charge control method, the vehicle power management device may include a step of detecting a change in the battery state and a step of controlling the battery in accordance with the detected change in the battery state.

  ADVANTAGE OF THE INVENTION According to this invention, while detecting a battery state at an early stage, unnecessary communication can be reduced and power consumption can be reduced.

  The best embodiment of the present embodiment will be described with reference to the accompanying drawings.

  First, the system configuration of this embodiment will be described with reference to FIG. The vehicle power management system 1 according to this embodiment includes a battery 10, an integrated control device 20, a sensor 31, a nonvolatile memory 33, a notification device 32, and an alternator 50. In addition, a plurality of ECUs (Electronic Control Units) and the like are connected to the integrated control device 20 of the vehicle power management system 1 through power lines.

The battery 10 includes a control unit 11 and a power storage unit 12. The power storage unit 12 stores the power generated by the alternator 50.
The control unit 11 includes a battery state calculation unit 13 and an external communication unit 14.
The battery state calculation unit 13 calculates battery state information (battery capacity, battery deterioration state, etc.) from the voltage, current, and liquid temperature of the battery 10 measured by the sensor 31. The battery state calculation unit 13 is used when the engine is started. When there is a large discharge exceeding a predetermined value, the current and voltage are measured in pairs for a predetermined time as shown in FIG. 2 (n (n is an arbitrary natural number) times), and the measured current And the internal resistance Rn is calculated from the voltage. The calculation formula is the following formula (1). This internal resistance Rn corresponds to the degree of deterioration of the battery.
Rn = {(V _n −V _n−1 ) / (I _n −I _n−1 ) + (V _n−1 −V _n−2 ) / (I _n−1 −I _n−2 ) +.・} / N (1)
The battery capacity can be obtained by integrating the current accumulated until the battery voltage returns to X [V] (eg, 1 [V]) when the engine is started.

The external communication unit 14 includes a transceiver 15 and transmits the battery state information calculated by the battery state calculation unit 13 to the integrated control device 20 at a predetermined timing. The transmission timing of the battery state information may be a timing when the battery state calculation unit 13 detects a change in the battery state, or may be a time when there is a request for acquisition of the battery state information from the integrated control device 20.
The transceiver 15 included in the external communication unit 14 communicates with the external communication unit 27 of the integrated control apparatus 20 in accordance with, for example, a LIN (Local Interconnect Network) communication protocol. The transceiver 15 is powered off except when communicating.

  The integrated control device 20 includes a battery connection recognition unit 21, a battery state determination unit 22, a power management unit 23, a charge control unit 24, and external communication units 25 and 27.

The battery connection recognition unit 21 detects the attachment / detachment of the battery 10. A method for detecting the attachment / detachment of the battery 10 in the battery connection recognition unit 21 will be described with reference to FIG. FIG. 3 shows a configuration of the ECU 100 including the integrated control device 20.
The ECU 100 can be applied to an idling stop control ECU that causes the vehicle to travel while driving and stopping the engine, for example. The microcomputer 101 in the ECU 100 includes a ROM 102 and a RAM as memories. The RAM includes an NRAM (normal RAM) 103 and an SRAM (standby RAM) 104. The NRAM 103 is a memory in which the power supply from the battery 10 is turned off when the ignition key is turned on, and the recorded data is erased. The SRAM continues to be supplied with power even when the ignition key is turned off. Memory that keeps data.
A unique keyword is written in a predetermined area of the SRAM 104. When the ignition key is turned on and the power is turned on, the battery connection recognition unit 21 refers to the predetermined area of the SRAM 104 and determines whether or not the unique keyword written in the predetermined area is broken. When the unique keyword is broken, it is determined that the battery 10 is removed and the power supply to the SRAM 104 is stopped. That is, the battery connection recognition unit 21 can detect the removal and attachment of the battery 10 from the vehicle by checking the state of the unique keyword written in the SRAM 104.

The battery state determination unit 22 inputs the voltage, current, and liquid temperature of the battery 10 measured by the sensor 31, and detects the capacity and deterioration state of the battery from these measured values. The calculation method is the same as that of the battery state calculation unit 13. Moreover, the battery state determination part 22 calculates | requires the dischargeable capacity | capacitance of a battery from the calculated battery capacity | capacitance and a battery degradation degree (internal resistance).
First, the battery state determination unit 22 obtains a correction coefficient for correcting the battery capacity from the degree of battery deterioration (internal resistance) with reference to the characteristic diagram of the correction coefficient shown in FIG. The calculated battery capacity is added to the obtained correction coefficient to obtain the dischargeable capacity of the battery 10. The calculated dischargeable capacity is output as a map value (determination map) for controlling overdischarge and overcharge of the battery 10 to the power management unit 23 and the charge control unit 24 together with the charge state information of the battery.

  The power management unit 23 receives supply of power from the power storage unit 12 of the battery 10 and supplies the supplied power to an ECU connected to a plurality of power supply lines. Further, the power management unit 23 adjusts the power supplied to a plurality of ECUs (corresponding to the in-vehicle control device of the present invention) based on the state of charge of the battery 10 and the map value calculated by the battery state determination unit 22. . The power management unit 23 functions as the second communication unit of the present invention, and is configured to be able to communicate with a plurality of ECUs even while the power of the transceiver 15 as the first communication unit is shut off. Has been. The plurality of power supply lines, ECUs, etc. will be described later.

The charge control unit 24 requests the alternator 50 to generate power based on the charge state information and the map value detected by the battery state determination unit 22. The charging control unit 24 outputs a power generation request to the alternator 50 using the external communication unit 25.
The battery 10 has a predetermined amount of current that can be charged and an amount of current that can be discharged for each battery. In the charge control, it is necessary to control the power generation amount of the alternator 50 so that the battery 10 is not overdischarged or overcharged. Since the amount of current that can be charged and discharged depends on the battery capacity and the degree of battery deterioration, when a battery deterioration or battery replacement is detected, a map value that corrects the battery capacity is obtained and based on this map value. Control is performed so that the battery is not overdischarged or overcharged.

The external communication unit 25 includes a transceiver 26 and performs communication with the alternator 50 according to the LIN communication protocol. The transceiver 26 is powered off when communication with the alternator 50 is not performed.
The external communication unit (power cutoff unit) 27 includes a transceiver (first communication unit) 28, and performs communication with the battery 10 according to a communication protocol of LIN. The external communication unit 27 turns off the power supply to the transceiver 28 when communication with the battery 10 is not performed. The power supply states of the transceiver 26 and the transceiver 28 can be individually controlled.
In the present embodiment, the external communication unit 25 for the alternator and the external communication unit 27 for the battery are provided. However, the communication between the alternator 50 and the battery 10 is performed by one external communication unit. It may be.

A + B power line 60, an ACC power line 70, and an IG power line 80 are connected to the power management unit 23 of the integrated control device 20. The + B power line 60 is a power line directly connected to the battery 10. The ACC power supply line 70 is a power supply line to which power is supplied when an ignition switch (not shown) provided in the + B power supply line 60 is turned on at the accessory position. The IG power line 80 is a power line to which power is supplied when the ignition switch is turned on at the ignition position.
A security ECU 62, a body ECU 63, a meter ECU 64, and the like are connected to the + B power supply line 60.
The ACC power line 70 includes an ACC relay switch 71, an air conditioner ECU 72 connected via a switch 75, a navigation ECU 73 connected via a switch 76, and an airbag ECU 74 connected via a switch 77. It is connected.
Connected to the IG power supply line 80 are an IG relay switch 81, an engine ECU 82 connected via a switch 85, a brake ECU 83 connected via a switch 86, and a steering ECU 84 connected via a switch 87. Has been.
These ECUs communicate with the power management unit 23 of the integrated control apparatus 20, and the power management unit 23 controls the power supplied to each ECU based on the communication results with the plurality of ECUs.

The alternator 50 includes a power generation unit 51 and a control unit 52, and the control unit 52 includes an external communication unit 53 and a power generation management unit 55.
The external communication unit 53 also has a transceiver 54, and receives instruction information transmitted from the charge control unit 24 of the integrated control device 20 in accordance with the protocol of LIN communication. The instruction information includes power generation start instruction information and power generation stop instruction information. The transceiver 54 is powered off when communication with the battery 10 and the alternator 50 is not performed.

  The power generation management unit 55 is a functional unit that manages the power generation of the power generation unit 51 in accordance with the instruction information received by the external communication unit 53. When no power is stored in the power storage unit 12 of the battery 10, the power generation unit 51 is driven to supply power, and when the power storage unit 12 is fully charged, the driving of the power generation unit 51 is stopped.

  The notification device 32 notifies the user that the replacement of the battery 10 is detected when the replacement of the battery 10 is detected. The battery state information calculated by the battery state calculation unit 13 and the battery state determination unit 22 is recorded in the nonvolatile memory 33.

  In the present embodiment, as described above, the external communication unit 14 includes the battery 10 having the battery state calculation unit 13 that calculates information indicating the charge state of the battery 10 and the integrated control device 20 that controls charging and discharging of the battery 10. , 27 are provided to communicate between these devices. In such a configuration, when the battery 10 determines that there is a change in its charge state, the battery 10 notifies the integrated control device 20 of the charge state using the external communication unit 14. Since communication from the battery 10 to the integrated control device 20 is performed only when there is a change in the charge state of the battery 10, the battery state is notified at a suitable timing, and unnecessary communication can be reduced. Furthermore, when communication is not performed between the battery 10 and the integrated control device 20, the power supply to the transceivers 15 and 28 is turned off. Therefore, useless power consumption can be reduced.

  The integrated control device 20 also includes a battery state determination unit 22 that detects a change in the state of charge of the battery 10 based on the measurement value measured by the sensor 31 to detect a change in the state of charge of the battery. ing. Furthermore, a battery connection recognition unit 21 that detects removal of the battery 10 from the vehicle is provided on the side of the integrated control device 20 to detect attachment / detachment of the battery 10 from the vehicle. When the integrated controller 20 detects deterioration or detachment of the battery 10, charge / discharge control suitable for a new battery capacity is performed. In this way, the state of the battery 10 can be recognized regardless of the notification from the battery 10 by detecting the deterioration of the battery 10 or the removal / removal of the battery on the integrated control device 20 side. Therefore, unnecessary communication from the battery 10 to the integrated control device 20 can be reduced. In addition, since the integrated control device 20 can quickly recognize the change in the battery state, it is possible to prevent the battery 10 from being deteriorated and improve the fuel efficiency of the engine.

A processing procedure of this embodiment will be described. First, the processing procedure of the integrated control apparatus 20 will be described with reference to the flowchart shown in FIG. This processing flow is performed at predetermined intervals with the ignition key being turned on as a start timing.
The integrated control device 20 determines the connection of the battery 10 at the connection determination timing of the battery 10 (step S1 / YES) (step S2). This process will be described later. If it is determined in step S2 that the battery is connected (step S3 / YES), the battery 10 is instructed to transmit battery state information (step S4).

  When the battery 10 is instructed to transmit the battery state information and the battery state information is transmitted from the battery 10 (step S5 / YES), the integrated control device 20 stores the battery state information acquired from the battery 10 last time in the nonvolatile memory. It acquires from 33 (step S6). If the battery status information is not transmitted from the battery 10 even after the predetermined time has elapsed (step S5 / NO), this process is terminated.

The integrated control device 20 compares the battery capacity included in the battery state information acquired this time with the battery capacity included in the battery state information acquired last time (step S7).
If there is a difference of a predetermined value or more between the previous battery capacity and the current battery capacity (step S7 / YES), the integrated control device 20 determines that the battery 10 has been replaced (step S8). In this case, the integrated control device 20 notifies the user of battery replacement via the notification device 32 (step S9), and writes the battery state information acquired from the battery 10 this time in the nonvolatile memory 33 (step S10). Thereafter, the integrated control device 20 switches the charge control map for determining overdischarge and overcharge (step S11).

  If it is not the connection determination timing of the battery 10 (step S1 / NO), the integrated control device 20 determines whether or not there is a request for acquiring battery state information from the battery 10 (step S12). If there is no battery status information acquisition request (step S12 / NO), this process ends. When there is a request for obtaining battery state information from the battery 10 (step S12 / YES), the integrated control device 20 instructs the battery 10 to transmit battery state information (step S13).

When the battery 10 is instructed to transmit the battery state information and the battery state information is transmitted from the battery 10 (step S14 / YES), the integrated control device 20 acquires the information on the battery deterioration degree from the battery state information ( Step S15).
When the integrated control apparatus 20 acquires the information on the battery deterioration level, the integrated control apparatus 20 notifies the user of the deterioration level of the battery 10 based on the acquired deterioration level information (step S16). Further, the integrated control device 20 writes the information on the degree of battery deterioration acquired from the battery in the nonvolatile memory 33, and stores the information (step S17). Thereafter, the integrated control device 20 corrects the charge control map according to the information on the battery deterioration degree (step S18).

Next, a first flow in which the battery state determination unit 22 detects the detachment of the battery 10 will be described with reference to the flowcharts shown in FIGS. 6 and 7. First, the processing procedure of the battery state determination unit 22 when the engine is stopped will be described with reference to the flowchart shown in FIG.
When the engine stops (step S21 / YES), the battery state determination unit 22 acquires a battery voltage (hereinafter, this voltage is referred to as V0) at the time of engine stop from the sensor 31 (step S22). The battery state determination unit 22 writes the acquired battery voltage V0 in the nonvolatile memory 33 (step S23).

Next, the processing procedure of the battery state determination unit 22 when the vehicle is powered on will be described with reference to the flowchart shown in FIG.
First, when the power supply is started, the battery state determination unit 22 acquires a battery voltage at the time of starting the power supply (hereinafter, this voltage is referred to as V1) (step S25).
Next, the battery state determination unit 22 obtains a difference (V1−V0) between the voltage V1 when the power supply to the engine is started and the voltage V0 when the engine is stopped, and compares this with the threshold value V2. (Step S26). When (V1-V0) is equal to or greater than the threshold value V2 (step S26 / YES), the battery state determination unit 22 determines that the battery is connected (step S27). When (V1-V0) is smaller than threshold value V2 (step S26 / NO), battery state determination unit 22 determines that there is no battery connection.

Next, a second flow in which the battery connection recognition unit 21 detects the attachment / detachment of the battery 10 will be described with reference to the flowchart shown in FIG. This flow is a flow that starts when the power is turned on.
The battery connection recognition unit 21 refers to a predetermined area of the SRAM 104 and determines whether or not the unique keyword written in the predetermined area is broken (step S31). When the unique keyword is broken (step S31 / YES), the battery connection recognition unit 21 determines that the battery is connected (step S32). In addition, when the unique keyword is not broken (step S31 / NO), the battery connection recognition unit 21 determines that the battery is not attached or detached.

The battery connection recognition unit 21 outputs a determination result to the battery state determination unit 22 when it is determined in the flow shown in FIG. The battery state determination unit 22 is notified of the determination result that there is a battery connection from the battery connection recognition unit 21, and when it is determined that there is a battery connection in the flow shown in FIG. 6 and FIG. Request switching. Further, the battery state determination unit 22 instructs the power management unit 23 to correct the power management map.
In the above-described flow, when it is determined that the battery is connected in both the flow shown in FIGS. 6 and 7 and the flow shown in FIG. 8, it is determined that the battery is connected. When it is determined that there is a connection, it may be determined that there is a battery connection.

Next, the processing procedure of the battery state calculation unit 13 of the battery 10 will be described with reference to the flowchart shown in FIG. In the flow, when the battery 10 has a terminal for inputting the on / off information of the ignition switch from the vehicle, the following processing is performed at a predetermined cycle according to the start state of the vehicle. Further, when the above-described input terminal is not provided, the power supply is always received regardless of the vehicle, and the following processing is executed at a predetermined cycle.
In addition, when the ignition switch is off, control is performed to reduce battery consumption by increasing the processing (detection) cycle. However, processing (detection) is not performed even if the ignition switch is off. Is called.

When the battery state calculation unit 13 determines that a starter motor (not shown) is turned on, an abrupt steering operation is performed, or an auxiliary machine such as an air conditioner is operated, the battery 10 discharges more than a predetermined value. (Step S41 / YES), information on the voltage, current, and liquid temperature of the battery 10 is acquired from the sensor 31 (Step S42). Based on the acquired information, it is determined whether or not the state of the battery 10 has changed (step S43). When there is no change in the battery state (step S43 / NO), this process is terminated. When there is a change in the battery state (step S43 / YES), the battery state calculation unit 13 transmits a battery information transmission request to the integrated control device 20 via the external communication unit 14 (step S44). Thereafter, the battery state calculation unit 13 waits until a transmission request for battery state information is sent from the integrated control device 20. When the battery state calculation unit 13 receives a battery state information acquisition request from the integrated control device 20 (step S45 / YES), the battery state calculation unit 13 transmits the battery state information to the integrated control device 20 via the external communication unit 14 (step S46). .
Further, in step S41, when it is not possible to detect a discharge of a predetermined value or more from the battery 10 (step S41 / NO), this process is terminated.

  The embodiment described above is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

It is a figure which shows a system configuration. It is a figure for demonstrating the method to calculate the deterioration degree of a battery. It is a figure which shows the structure of ECU. It is a figure which shows the characteristic of a correction coefficient. It is a flowchart which shows the process sequence of an integrated control apparatus. It is a flowchart which shows the process sequence of the battery state determination part at the time of an engine stop. It is a flowchart which shows the process sequence of the battery state determination part at the time of power-on of a vehicle. It is a flowchart which shows the 2nd flow which detects the connection of a battery. It is a figure which shows the process sequence of the battery which detects the change of the state of a battery and notifies an integrated control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle power management system 10 Battery 11 Control part 12 Power storage part 13 Battery state calculation part (determination means)
14 External communication unit 15 Transceiver (communication means)
20 Integrated control device (vehicle power management device)
21 Battery connection recognition unit (detection means)
22 Battery state determination unit (detection means)
23 Power management unit (second communication means)
24 charge control unit 25 external communication unit 26 transceiver 27 external communication unit (power cutoff means)
28 transceiver (first communication means, communication means)
31 Sensor (sensor means)
32 Notification Device 33 Nonvolatile Memory 50 Alternator 51 Power Generation Unit 52 Control Unit 53 External Communication Unit 54 Transceiver 55 Power Generation Management Unit

Claims (9)

A vehicle power management system comprising: a battery having a determination unit that determines its own state of charge based on a measured value measured by a sensor unit; and a vehicle power management device that controls charging / discharging of the battery,
The battery and the vehicle power management device each have a communication means,
When determining that the battery has changed in its charge state, the battery notifies the vehicle power supply management device of the charge state using the communication means. The vehicle power management device has a detecting means for detecting a change in a battery state,
The vehicle power management system according to claim 1, wherein the battery is controlled in accordance with a detection result of the detection means.   3. The vehicle power management system according to claim 2, wherein the detection means is means for detecting a change in the state of charge of the battery based on a measurement value measured by the sensor means.   3. The vehicle power management system according to claim 2, wherein the detection means is means for detecting removal of the battery from the vehicle.   5. The vehicle power management system according to claim 4, wherein the detection means detects removal of the battery from the vehicle depending on whether or not the keyword written in the memory is broken.   2. The vehicle power management system according to claim 1, wherein the communication means is powered off except during communication. A power management device for a vehicle that controls charging / discharging of a battery having storage means for storing its charge state,
First communication means for communicating with the battery;
A second communication means for communicating with a vehicle-mounted control device different from the battery;
A power shut-off means for shutting off the power of the first communication means when communication with the battery is not required,
The second communication means is configured to be able to communicate with the in-vehicle control device even while the power supply of the first communication means is shut off by the power shut-off means. Vehicle power management device. A communication unit is used for a step of determining a change in the state of charge of the battery mounted on the vehicle and a power management device for the vehicle that controls charging / discharging of the battery when the state of charge changes. And notifying the change in the state of charge,
The vehicle power management apparatus includes a step of controlling a battery according to a change in a state of charge. In the vehicle power management device, detecting a change in battery state;
The charge control method according to claim 8, further comprising: controlling the battery according to the detected change in the battery state.

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