JP2015107022A - Charging/discharging control device of vehicle - Google Patents

Charging/discharging control device of vehicle Download PDF

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JP2015107022A
JP2015107022A JP2013249245A JP2013249245A JP2015107022A JP 2015107022 A JP2015107022 A JP 2015107022A JP 2013249245 A JP2013249245 A JP 2013249245A JP 2013249245 A JP2013249245 A JP 2013249245A JP 2015107022 A JP2015107022 A JP 2015107022A
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voltage battery
charging
charge
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崇彦 平沢
Takahiko Hirasawa
崇彦 平沢
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

PROBLEM TO BE SOLVED: To allow charging to a low voltage battery from a high voltage battery in polarizing state where charging/discharging is prohibited, relating to a charging mode for charging from an external power source of a plug-in hybrid automobile.SOLUTION: When a high voltage battery 16 is in polarizing state, charging/discharging from the battery 16 is prohibited in principle. When an accumulated amount of a low voltage battery 24 comes to be a predetermined value or less, even if charging/discharging with the high voltage battery 16 is prohibited, the high voltage battery 16 is discharged and its power is charged to the low voltage battery 24.

Description

本発明は、外部電源から充電可能な高圧バッテリと、高圧バッテリから充電可能な低圧バッテリとを備えた車両の充放電制御装置に関する。   The present invention relates to a vehicle charge / discharge control device including a high voltage battery that can be charged from an external power source and a low voltage battery that can be charged from a high voltage battery.

駆動用の原動機として電動機を備えた車両、例えばハイブリッド自動車、電気自動車などが知られている。電動機の電源として、車両に搭載されたバッテリ（二次電池）を利用するのが一般的である。また、車両に搭載された電装品や電気機器の電源として、前述の電動機の電源用のバッテリとは別に、より端子電圧の低いバッテリを備えることも一般的である。以下、電動機の電源用のバッテリを「高圧バッテリ」、電装品等の電源となるバッテリを「低圧バッテリ」と記す。   As a driving prime mover, a vehicle equipped with an electric motor, such as a hybrid vehicle or an electric vehicle, is known. As a power source for the electric motor, a battery (secondary battery) mounted on the vehicle is generally used. Moreover, it is common to provide a battery having a lower terminal voltage as a power source for electrical components and electrical equipment mounted on the vehicle, in addition to the above-described battery for the power source of the electric motor. Hereinafter, a battery for power source of an electric motor is referred to as a “high voltage battery”, and a battery serving as a power source for electrical components or the like is referred to as a “low voltage battery”.

電気自動車はもちろんであるが、ハイブリッド自動車においても家庭用電源などの外部電源から高圧バッテリに充電することができる自動車、いわゆるプラグインハイブリッド自動車（ＰＨＶ）が知られている。高圧バッテリに分極が発生している状態で、高圧バッテリの充放電を行うと、バッテリの蓄電量を正確に取得できない場合がある。下記特許文献１には、高圧バッテリが分極状態にあるときは外部電源からの充電を行わず、分極状態の解消が推定されてから、充電を行う技術が開示されている。   In addition to electric vehicles, hybrid vehicles are also known as so-called plug-in hybrid vehicles (PHVs) that can charge a high voltage battery from an external power source such as a household power source. If charging / discharging of a high voltage battery is performed in a state where polarization occurs in the high voltage battery, the amount of charge stored in the battery may not be obtained accurately. Patent Document 1 below discloses a technique in which charging is not performed from an external power source when a high-voltage battery is in a polarized state, and charging is performed after it is estimated that the polarization state is eliminated.

特開２００９−３０３２９１号公報JP 2009-303291 A

蓄電量を正確に取得するために、分極が生じているとき、高圧バッテリに充放電を行わないようにすることが考えられる。しかし、このようにすると低圧バッテリの蓄電量が低下している場合に高圧バッテリから充電することができない。低圧バッテリは、各種制御装置に電力を供給しており、高圧バッテリおよび低圧バッテリの充放電を制御する充放電制御装置にも電力を供給している。低圧バッテリの蓄電量が低下すると、充放電の制御ができなくなるという問題がある。   In order to accurately acquire the charged amount, it is conceivable that charging / discharging is not performed on the high-voltage battery when polarization occurs. However, if this is done, charging from the high-voltage battery cannot be performed when the amount of electricity stored in the low-voltage battery is reduced. The low voltage battery supplies electric power to various control devices, and also supplies electric power to the charge / discharge control device that controls charging / discharging of the high voltage battery and the low voltage battery. When the amount of power stored in the low-voltage battery decreases, there is a problem that charge / discharge control cannot be performed.

本発明は、高圧バッテリに分極が生じているときであっても、低圧バッテリへの充電を可能とすることを目的とする。   An object of the present invention is to enable charging of a low voltage battery even when polarization occurs in the high voltage battery.

本発明に係る車両の充放電制御装置は、高圧バッテリが分極状態であるときには、高圧バッテリの充放電を禁止する高圧バッテリ充放電禁止部と、低圧バッテリの蓄電量を検出する低圧バッテリ蓄電量検出部と、検出された低圧バッテリの蓄電量が所定値以下の場合、高圧バッテリ充放電禁止部により高圧バッテリの充放電が禁止されていても、高圧バッテリから低圧バッテリに充電を行う低圧バッテリ充電制御部と、を有する。   The vehicle charge / discharge control device according to the present invention includes a high voltage battery charge / discharge prohibition unit that inhibits charge / discharge of the high voltage battery and a low voltage battery charge amount detection that detects the charge amount of the low voltage battery when the high voltage battery is in a polarized state. And low-voltage battery charge control for charging the low-voltage battery from the high-voltage battery even if charging / discharging of the high-voltage battery is prohibited by the high-voltage battery charge / discharge prohibition unit Part.

通常であれば高圧バッテリの充放電が行われない高圧バッテリの分極状態において、低圧バッテリの充電が可能となる。   Normally, charging of the low voltage battery is possible in the polarization state of the high voltage battery in which charging and discharging of the high voltage battery is not performed.

本実施形態のシステム概要を示す図である。It is a figure which shows the system outline | summary of this embodiment. 充電モードにおける制御フローを示す図である。It is a figure which shows the control flow in charge mode.

以下、本発明の実施形態を、図面に従って説明する。図１は、ＰＨＶ（プラグインハイブリッド自動車）の電動駆動系装置１０のシステム概要図である。このＰＨＶ車両においては、２個の電動機１２Ａ，１２Ｂと内燃機関（不図示）を車両駆動用の原動機として備えている。２個の電動機１２Ａ，１２Ｂは発電機として機能することができ、電動機１２Ａは内燃機関に駆動されて主に発電機として機能する。電動機１２Ｂは、車両駆動用の電動機として機能するが、回生発電も行う。２個の電動機１２Ａ，１２Ｂにより発電された電力は、蓄電装置１４の車両駆動用バッテリ１６に蓄えられる。この車両駆動用バッテリ１６が電動機１２Ａ，１２Ｂの電源となるバッテリであり、この実施形態の高圧バッテリである。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system schematic diagram of an electric drive system 10 of a PHV (plug-in hybrid vehicle). This PHV vehicle includes two electric motors 12A and 12B and an internal combustion engine (not shown) as a prime mover for driving the vehicle. The two electric motors 12A and 12B can function as a generator, and the electric motor 12A is driven by an internal combustion engine and mainly functions as a generator. The electric motor 12B functions as an electric motor for driving the vehicle, but also performs regenerative power generation. The electric power generated by the two electric motors 12 </ b> A and 12 </ b> B is stored in the vehicle driving battery 16 of the power storage device 14. The vehicle driving battery 16 is a battery that serves as a power source for the electric motors 12A and 12B, and is a high-voltage battery of this embodiment.

電動機１２Ａ，１２Ｂは三相交流電動機であり、高圧バッテリ１６との間で交流／直流の電力変換を行うために、電動駆動系装置１０はインバータ１８を備える。また、電動駆動系装置１０は、蓄電装置１４の電圧を昇圧してインバータ１８に供給する昇圧回路２０を有する。蓄電装置１４は、空気調和装置２２にも電力を供給する。   The electric motors 12 </ b> A and 12 </ b> B are three-phase AC electric motors, and the electric drive system device 10 includes an inverter 18 in order to perform AC / DC power conversion with the high voltage battery 16. Further, the electric drive system device 10 includes a booster circuit 20 that boosts the voltage of the power storage device 14 and supplies the boosted voltage to the inverter 18. The power storage device 14 also supplies power to the air conditioning device 22.

さらに、この実施形態のＰＨＶは、電装品、電気機器等に電力を供給する補機用バッテリ２４を備える。電装品、電気機器等は、例えば前照灯、制動灯などの灯火器、室内の照明器、音響装置、および経路誘導装置、更にＰＨＶの各装置、各機器を制御する電子制御装置等を含む。これらの電気機器等に供給される電力の電圧は、車両駆動用の電動機１２Ａ，１２Ｂに供給される電力の電圧よりも低い。このため、補機用バッテリ２４の電圧は高圧バッテリ１６より低い。この補機用バッテリ２４がこの実施形態の低圧バッテリである。電動駆動系装置１０には、低圧バッテリ２４に充電を行うために電圧変換器（ＤＣ／ＤＣコンバータ）２６が備えられている。電圧変換器２６により高圧バッテリ１６の電圧が降圧されて低圧バッテリ２４に電力が供給される。   Furthermore, the PHV of this embodiment includes an auxiliary battery 24 that supplies electric power to electrical components, electrical equipment, and the like. Electrical components, electrical equipment, and the like include, for example, lights such as headlamps and brake lights, indoor illuminators, acoustic devices, and route guidance devices, PHV devices, and electronic control devices that control the devices. . The voltage of the electric power supplied to these electric devices etc. is lower than the voltage of the electric power supplied to the motors 12A and 12B for driving the vehicle. For this reason, the voltage of the auxiliary battery 24 is lower than that of the high voltage battery 16. This auxiliary battery 24 is the low voltage battery of this embodiment. The electric drive system 10 is provided with a voltage converter (DC / DC converter) 26 for charging the low-voltage battery 24. The voltage of the high voltage battery 16 is stepped down by the voltage converter 26 and electric power is supplied to the low voltage battery 24.

さらに、このＰＨＶは、高圧バッテリ１６に外部電源２８から充電を行うための充電装置３０を備えている。充電装置３０は、外部電源２８と接続するためのプラグ３２を備えている。充電装置３０は、例えば単相１００Ｖまたは単相２００Ｖの交流電力を直流電力に変換して蓄電装置１４に供給する。充電装置３０から低圧バッテリ２４を充電可能としてもよい。   The PHV further includes a charging device 30 for charging the high voltage battery 16 from the external power supply 28. The charging device 30 includes a plug 32 for connecting to the external power source 28. The charging device 30 converts, for example, single-phase 100 V or single-phase 200 V AC power into DC power and supplies the DC power to the power storage device 14. The low voltage battery 24 may be chargeable from the charging device 30.

蓄電装置１４には、高圧バッテリ１６をインバータ１８に接続するためのシステムメインリレー３４ａ，３４ｂ、および高圧バッテリ１６を充電装置３０に接続するための充電用リレー３６ａ，３６ｂを有する。また、これら２個のリレーにそれぞれ対応して初期メインリレー３４ｐ、充電用初期リレー３６ｐが設けられている。高圧バッテリ１６をインバータ１８に接続する際、まずシステムメインリレー３４ａと初期メインリレー３４ｐを接続し、その後、初期メインリレー３４ｐを遮断し、システムメインリレー３４ｂを接続する。初期メインリレー３４ｐを接続することにより、接続初期において抵抗３８を介して接続され、高圧バッテリ１６を流れる電流の急激な増加を防止することができる。同様に、充電初期において充電用初期リレー３６ｐを介して高圧バッテリ１６と充電装置３０が接続され、電流の急増を防止することができる。   The power storage device 14 includes system main relays 34 a and 34 b for connecting the high voltage battery 16 to the inverter 18, and charging relays 36 a and 36 b for connecting the high voltage battery 16 to the charging device 30. An initial main relay 34p and a charging initial relay 36p are provided corresponding to each of these two relays. When connecting the high voltage battery 16 to the inverter 18, the system main relay 34a and the initial main relay 34p are first connected, and then the initial main relay 34p is shut off and the system main relay 34b is connected. By connecting the initial main relay 34p, it is possible to prevent a sudden increase in the current flowing through the high-voltage battery 16 that is connected via the resistor 38 in the initial connection. Similarly, in the initial stage of charging, the high voltage battery 16 and the charging device 30 are connected via the charging initial relay 36p, and a sudden increase in current can be prevented.

高圧バッテリ１６および低圧バッテリ２４の充放電制御は、充放電制御装置４０により制御される。充放電制御装置４０は、一つまたは複数の電子制御装置を含み、この、またはこれらの電子制御装置が所定の制御を実行することにより、充放電制御装置４０として機能する。簡略化するために、図１においては、充放電制御装置４０が蓄電装置１４、電圧変換器２６および低圧バッテリ２４との関連が示されているが、他の装置とも関連を有し、電動駆動系装置１０全体の状況に基づき各バッテリの充放電の制御を行う。   The charge / discharge control of the high voltage battery 16 and the low voltage battery 24 is controlled by the charge / discharge control device 40. The charge / discharge control device 40 includes one or more electronic control devices, and functions as the charge / discharge control device 40 when this or these electronic control devices execute predetermined control. For the sake of simplicity, FIG. 1 shows that the charge / discharge control device 40 is related to the power storage device 14, the voltage converter 26, and the low voltage battery 24. The charging / discharging control of each battery is performed based on the situation of the entire system device 10.

充放電制御装置４０は、高圧バッテリ１６が分極した状態のときには、高圧バッテリ１６の充放電を禁止する高圧バッテリ充放電禁止部４２を備える。高圧バッテリ１６の分極発生の判断は、例えば、当該バッテリ１６に流れる電流に基づき判定する。電流、例えば電流の二乗値が所定値以上に大きくなると、分極が発生したと判断する。電流が所定値未満となった後も分極した状態が続き、定まった所定時間が経過するまで分極状態が続いていると判断する。この間、原則的に高圧バッテリ１６の充放電を禁止する。高圧バッテリ１６を流れる電流は、例えば蓄電装置１４に備えられた電流センサ４４により検出される。充放電制御装置４０において、電流センサ４４に検出された電流値に基づき、分極状態となっているかが判定される。電流値、または電流の二乗値が所定値を超えた後、所定値未満となった時点から経過時間が計数される。経過時間が所定値に達するまでは分極状態と判断される。なお、分極発生の判断は、上記の電流に基づくもの以外の方法、例えばバッテリ温度に基づく方法などを用いることができる。   The charge / discharge control device 40 includes a high voltage battery charge / discharge prohibition unit 42 that prohibits charge / discharge of the high voltage battery 16 when the high voltage battery 16 is polarized. The determination of the occurrence of polarization of the high voltage battery 16 is made based on, for example, the current flowing through the battery 16. When the current, for example, the square value of the current becomes larger than a predetermined value, it is determined that polarization has occurred. It is determined that the polarization state continues even after the current becomes less than the predetermined value, and the polarization state continues until a predetermined time has elapsed. During this time, charging / discharging of the high voltage battery 16 is prohibited in principle. The current flowing through the high voltage battery 16 is detected by, for example, a current sensor 44 provided in the power storage device 14. In the charge / discharge control device 40, it is determined based on the current value detected by the current sensor 44 whether it is in a polarization state. After the current value or the square value of the current exceeds a predetermined value, the elapsed time is counted from the time when it becomes less than the predetermined value. Until the elapsed time reaches a predetermined value, it is determined as a polarization state. For the determination of the occurrence of polarization, a method other than the method based on the above-described current, for example, a method based on the battery temperature can be used.

分極状態においては、バッテリに供給される電力およびバッテリから放出される電力と、バッテリの蓄電量の関係が、分極していない状態と異なる。このため、分極状態においてバッテリの充電または放電を行うと、バッテリ蓄電量が正確に把握できなくなる場合がある。蓄電量の精度を高くするため、分極状態における充放電を原則禁止している。   In the polarization state, the relationship between the power supplied to the battery, the power discharged from the battery, and the amount of charge stored in the battery is different from the non-polarized state. For this reason, when the battery is charged or discharged in the polarization state, the battery charge amount may not be accurately grasped. In order to increase the accuracy of the charged amount, charging / discharging in the polarization state is generally prohibited.

しかし、この充放電制御装置４０においては、低圧バッテリ２４の蓄電量が低下したときには、前記の原則に反して、高圧バッテリ１６から低圧バッテリ２４へ電力供給を行う。充電装置３０の供給可能な電力は比較的少なく、低圧バッテリ２４を十分充電できない場合がある。充電モードにおいては、一部の電気機器に電力が供給されており、低圧バッテリ２４の電力が消費されている。このとき低圧バッテリ２４の蓄電量が少なく、十分な電力が供給されないと、電圧が低下し、充放電制御装置４０等が動作しなくなる可能性がある。このような状態を回避するために、より供給電力の大きい電圧変換器２６を介して高圧バッテリ１６から低圧バッテリ２４の充電を行う。   However, in the charge / discharge control device 40, when the stored amount of the low voltage battery 24 decreases, power is supplied from the high voltage battery 16 to the low voltage battery 24 contrary to the above principle. The charging device 30 can supply relatively little power, and the low voltage battery 24 may not be sufficiently charged. In the charging mode, power is supplied to some of the electric devices, and the power of the low-voltage battery 24 is consumed. At this time, if the amount of power stored in the low-voltage battery 24 is small and sufficient power is not supplied, the voltage may drop and the charge / discharge control device 40 or the like may not operate. In order to avoid such a state, the low voltage battery 24 is charged from the high voltage battery 16 via the voltage converter 26 having a larger supply power.

充放電制御装置４０は、低圧バッテリ２４の蓄電量を検出する低圧バッテリ蓄電量検出部４６を備える。蓄電量は、例えば低圧バッテリ２４の端子電圧に基づき検出することができる。端子電圧が例えば１１Ｖ以下に低下したら蓄電量が低下したと判断する。充放電制御装置４０は、低圧バッテリ２４の蓄電量が低下したとき、低圧バッテリ２４の充電を制御する低圧バッテリ充電制御部４８を更に有する。低圧バッテリ充電制御部４８は、電圧変換器２６を制御して高圧バッテリ１６から低圧バッテリ２４の充電を行う。   The charge / discharge control device 40 includes a low-voltage battery charge amount detection unit 46 that detects the charge amount of the low-voltage battery 24. The amount of stored electricity can be detected based on the terminal voltage of the low voltage battery 24, for example. If the terminal voltage decreases to, for example, 11 V or less, it is determined that the storage amount has decreased. The charge / discharge control device 40 further includes a low-voltage battery charge control unit 48 that controls charging of the low-voltage battery 24 when the storage amount of the low-voltage battery 24 decreases. The low voltage battery charge control unit 48 controls the voltage converter 26 to charge the low voltage battery 24 from the high voltage battery 16.

図２は、電動駆動系装置１０が外部電源に接続され、充電可能となったモード（以下、充電モードと記す。）に係る制御のフローチャートである。まず、充電モードであるかが判断される（Ｓ１００）。充電モードであるかは、プラグ３２が外部電源２８に接続されているかで判断する。充電モードでなければ終了する。充電モードである場合、充放電要求があるかが判断される（Ｓ１０２）。この充放電要求は、その時点において充電または放電を伴う機器の動作の要求があるかを示すものであり、将来における充電または放電の要求を示すものではない。例えば、ある時間を設定し、その時間が経過した後、空気調和装置２２を作動させる場合、設定時間経過前は放電要求はないとされ、所定時間経過した後は放電要求があるとされる。空気調和装置２２のタイマー設定は、前記の設定時間経過後の作動の他に、作動開始時刻を設定する方法や、運転者が搭乗する時刻を設定する方法などがある。運転者が搭乗する時刻を設定する方法においては、その時刻に希望する温度となるように事前に空気調和装置２２が作動を開始する。   FIG. 2 is a flowchart of control according to a mode in which the electric drive system device 10 is connected to an external power source and can be charged (hereinafter referred to as a charging mode). First, it is determined whether the charging mode is set (S100). Whether the charging mode is selected is determined by whether the plug 32 is connected to the external power source 28. If not in charge mode, it ends. If it is in the charge mode, it is determined whether there is a charge / discharge request (S102). This charge / discharge request indicates whether there is a request for operation of the device that involves charging or discharging at that time, and does not indicate a request for charging or discharging in the future. For example, when a certain time is set and the air conditioner 22 is operated after the lapse of time, it is assumed that there is no discharge request before the set time elapses and there is a discharge request after a predetermined time elapses. The timer setting of the air conditioner 22 includes a method of setting an operation start time and a method of setting a time when the driver gets on, in addition to the operation after the set time has elapsed. In the method of setting the time when the driver gets on, the air conditioner 22 starts to operate in advance so that the desired temperature is reached at that time.

ステップＳ１０２にて充放電要求がない場合には、ステップＳ１００に戻る。一方、充放電要求がある場合、高圧バッテリ１６が分極状態にあるかを判断する（Ｓ１０４）。分極状態は、例えば、高圧バッテリ１６を流れる電流に基づき判断することができ、電流の二乗値が所定値以上となったことを持って分極の発生を判定し、電流の二乗値が所定未満となっても、所定時間分極状態が継続していると判断する。充放電制御装置４０は、充電モードとなる前のＰＨＶが運行している間も、高圧バッテリ１６の充放電を監視し、分極の発生を判断している。   If there is no charge / discharge request in step S102, the process returns to step S100. On the other hand, when there is a charge / discharge request, it is determined whether the high voltage battery 16 is in a polarized state (S104). The polarization state can be determined based on, for example, the current flowing through the high-voltage battery 16, and the occurrence of polarization is determined when the square value of the current is equal to or greater than a predetermined value, and the square value of the current is less than the predetermined value. Even if it becomes, it is judged that the polarization state continues for a predetermined time. The charge / discharge control device 40 monitors the charge / discharge of the high-voltage battery 16 while the PHV before entering the charge mode is operating, and determines the occurrence of polarization.

ステップＳ１０４にて分極状態でないと判断された場合、ステップＳ１０６に移行し、充放電要求に対応する制御が実行される。例えば、外部電源２８からの高圧バッテリ１６の充電制御が実行される。この制御を実行するために、充電用リレー３６ａ，３６ｂおよび充電用初期リレー３６ｐが制御される。前述のように、初期において充電用リレー３６ａと充電用初期リレー３６ｐが接続制御され、続いて充電用初期リレー３６ｐが遮断制御されると同時に充電用リレー３６ｂが接続制御される。そして、充電装置３０によって外部電源２８から高圧バッテリ１６に充電が行われる。   If it is determined in step S104 that the state is not the polarization state, the process proceeds to step S106, and control corresponding to the charge / discharge request is executed. For example, charging control of the high voltage battery 16 from the external power source 28 is executed. In order to execute this control, the charging relays 36a and 36b and the charging initial relay 36p are controlled. As described above, the charging relay 36a and the charging initial relay 36p are initially connected and controlled, and then the charging initial relay 36p is controlled to be disconnected and simultaneously the charging relay 36b is connected and controlled. Then, the charging device 30 charges the high voltage battery 16 from the external power source 28.

ステップＳ１０４にて分極状態であると判断された場合、低圧バッテリ２４の充電が必要かを判断する（Ｓ１０８）。必要でなければ、ステップＳ１００に戻る。この場合、ステップＳ１０６を回避して、ステップＳ１００に戻っており、高圧バッテリ１６が分極状態のときには、このバッテリの充放電が禁止されることになる。一方、ステップＳ１０８にて低圧バッテリ２４の充電が必要と判断された場合、システムメインリレーを接続制御して、高圧バッテリ１６の電力を放電し、電圧変換器２６を介して低圧バッテリ２４に供給し、充電を行う（Ｓ１１０）。そして、ステップＳ１００に戻る。なお、低圧バッテリ２４に対する充電の要否は、低圧バッテリ２４の端子電圧に基づき判断することができる。   If it is determined in step S104 that the state is polarized, it is determined whether the low voltage battery 24 needs to be charged (S108). If not necessary, the process returns to step S100. In this case, step S106 is avoided and the process returns to step S100. When the high voltage battery 16 is in a polarized state, charging / discharging of this battery is prohibited. On the other hand, if it is determined in step S108 that charging of the low voltage battery 24 is necessary, the system main relay is connected and controlled, and the power of the high voltage battery 16 is discharged and supplied to the low voltage battery 24 via the voltage converter 26. The battery is charged (S110). Then, the process returns to step S100. Whether the low voltage battery 24 needs to be charged can be determined based on the terminal voltage of the low voltage battery 24.

低圧バッテリ２４の蓄電量が回復すると、ステップＳ１０８にて「Ｎｏ」の判定がなされ、低圧バッテリ２４の充電が終了する。また、高圧バッテリ１６の分極状態が解消したと判断される（つまり、所定の時間が経過したと判断されると）、ステップＳ１０４にて「Ｎｏ」の判定がなされ、このバッテリ１６の充電または放電を伴う動作が実行される。   When the amount of power stored in the low voltage battery 24 is restored, a determination of “No” is made in step S108, and the charging of the low voltage battery 24 is completed. If it is determined that the polarization state of the high-voltage battery 16 has been eliminated (that is, if it is determined that a predetermined time has elapsed), “No” is determined in step S104, and the battery 16 is charged or discharged. An operation involving is performed.

以上のように、分極状態においては充放電が原則禁止される高圧バッテリ１６を、低圧バッテリ２４の充電が必要となった場合には禁止をせずに放電するよう制御する。これにより、低圧バッテリ２４の電圧が低下し、電気機器への電力供給が絶たれることが防止される。   As described above, the high voltage battery 16 that is basically prohibited from being charged and discharged in the polarization state is controlled to be discharged without being prohibited when the low voltage battery 24 needs to be charged. As a result, the voltage of the low voltage battery 24 is reduced, and the power supply to the electrical equipment is prevented from being cut off.

１０ 電動駆動系装置、１２Ａ，１２Ｂ 電動機、１４ 蓄電装置、１６ 高圧バッテリ（車両駆動用バッテリ）、２４ 低圧バッテリ（補機用バッテリ）、２６ 電圧変換器、２８ 外部電源、３０ 充電装置、３２ プラグ、４０ 充放電制御装置、４２ 高圧バッテリ充放電禁止部、４６ 低圧バッテリ蓄電量検出部、４８ 低圧バッテリ充電制御部。   DESCRIPTION OF SYMBOLS 10 Electric drive system apparatus, 12A, 12B Electric motor, 14 Electric power storage apparatus, 16 High voltage battery (vehicle drive battery), 24 Low voltage battery (auxiliary battery), 26 Voltage converter, 28 External power supply, 30 Charging apparatus, 32 Plug , 40 charge / discharge control device, 42 high voltage battery charge / discharge prohibition unit, 46 low voltage battery charge amount detection unit, 48 low voltage battery charge control unit.

Claims (1)

外部電源から充電可能な高圧バッテリと、高圧バッテリから充電可能な低圧バッテリとを備えた車両の充放電制御装置であって、
高圧バッテリが分極状態であるときには、高圧バッテリの充放電を禁止する高圧バッテリ充放電禁止部と、
低圧バッテリの蓄電量を検出する低圧バッテリ蓄電量検出部と、
検出された低圧バッテリの蓄電量が所定値以下の場合、高圧バッテリ充放電禁止部により高圧バッテリの充放電が禁止されていても、高圧バッテリから低圧バッテリに充電を行う低圧バッテリ充電制御部と、
を有する、車両の充放電制御装置。 A vehicle charge / discharge control device comprising a high voltage battery that can be charged from an external power source and a low voltage battery that can be charged from a high voltage battery,
When the high-voltage battery is in a polarized state, a high-voltage battery charge / discharge prohibition unit that prohibits charge / discharge of the high-voltage battery;
A low voltage battery storage amount detection unit for detecting a storage amount of the low voltage battery;
A low voltage battery charge control unit that charges the low voltage battery from the high voltage battery, even if the charge of the high voltage battery is prohibited by the high voltage battery charge / discharge prohibition unit,
A vehicle charge / discharge control device.
JP2013249245A 2013-12-02 2013-12-02 Charging/discharging control device of vehicle Pending JP2015107022A (en)

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