JP2008086060A - Charge controller of battery for vehicle - Google Patents

Charge controller of battery for vehicle Download PDF

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JP2008086060A
JP2008086060A JP2006259974A JP2006259974A JP2008086060A JP 2008086060 A JP2008086060 A JP 2008086060A JP 2006259974 A JP2006259974 A JP 2006259974A JP 2006259974 A JP2006259974 A JP 2006259974A JP 2008086060 A JP2008086060 A JP 2008086060A
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voltage
battery
outside air
charging voltage
air temperature
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JP4702243B2 (en
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Kenichi Saga
賢一 嵯峨
Hiroki Nishi
宏樹 西
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Nissan Motor Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To perform charge control of a battery without providing a temperature sensor for detecting the temperature of the battery. <P>SOLUTION: By supplying the voltage of a high voltage battery 1 to a low voltage battery 2 while stepping down, the charge controller of a vehicle battery for charging the low voltage battery 2 sets a target charging voltage of the low voltage battery 2 based on the engine cooling water temperature detected by an engine cooling water temperature sensor 9, and the outer air temperature detected by an outer air temperature sensor 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、車両用バッテリの充電制御装置に関する。   The present invention relates to a charging control apparatus for a vehicle battery.

従来、補機バッテリの温度を検出するためのサーミスタを設けた補機バッテリの充電制御装置が知られている（特許卯文献１参照）。この充電制御装置では、サーミスタによって検出される補機バッテリの温度に応じて、補機バッテリの充電電圧を決定し、決定した充電電圧に応じて、主バッテリの電圧をＤＣ−ＤＣコンバータで降圧して、補機バッテリの充電を行っている。   Conventionally, an auxiliary battery charge control device provided with a thermistor for detecting the temperature of the auxiliary battery is known (see Patent Document 1). In this charging control device, the charging voltage of the auxiliary battery is determined according to the temperature of the auxiliary battery detected by the thermistor, and the voltage of the main battery is stepped down by the DC-DC converter according to the determined charging voltage. Charging the auxiliary battery.

特開平７−１０７６１９号公報JP-A-7-107619

しかしながら、従来の技術では、補機バッテリの充電電圧を決定するために、バッテリの温度を検出するためのサーミスタが別途必要になるという問題があった。   However, the conventional technique has a problem that a thermistor for detecting the temperature of the battery is separately required to determine the charging voltage of the auxiliary battery.

本発明による車両用バッテリの充電制御装置は、車外の外気温度と、エンジン冷却水の温度とに基づいて、低電圧バッテリの目標充電電圧を設定し、設定した目標充電電圧に基づいて、高電圧バッテリの電圧を降圧して低電圧バッテリに供給することを特徴とする。   The charging control device for a vehicle battery according to the present invention sets a target charging voltage of a low-voltage battery based on an outside air temperature outside the vehicle and a temperature of engine cooling water, and sets a high voltage based on the set target charging voltage. The battery voltage is stepped down and supplied to a low voltage battery.

本発明による車両用バッテリの充電制御装置によれば、車外の外気温度と、エンジン冷却水の温度とに基づいて、低電圧バッテリの目標充電電圧を設定するので、低電圧バッテリの温度を検出する温度センサを設けずに、低電圧バッテリの状態に応じた充電を行うことができる。   According to the vehicle battery charging control apparatus of the present invention, the target charging voltage of the low-voltage battery is set based on the outside air temperature outside the vehicle and the temperature of the engine cooling water, so the temperature of the low-voltage battery is detected. Charging according to the state of the low voltage battery can be performed without providing a temperature sensor.

以下では、一実施の形態における車両用バッテリの充電制御装置をハイブリッド車に搭載して使用する例を挙げて説明する。図１は、一実施の形態における車両用バッテリの充電制御装置の全体構成を示す図である。   Hereinafter, an example in which the charging control device for a vehicle battery in one embodiment is mounted on a hybrid vehicle will be described. FIG. 1 is a diagram showing an overall configuration of a vehicle battery charging control apparatus according to an embodiment.

強電バッテリ（高電圧バッテリ）１は、図示しない車両駆動用モータに電力を供給するメインバッテリである。ＤＣ／ＤＣコンバータ３は、後述するＨＶ−ＥＣＵ５からの電圧指令に基づいて、強電バッテリ１の電圧を降圧して、補機バッテリ２、ＨＶ−ＥＣＵ５、ＥＮＧ−ＥＣＵ６、エアコンＥＣＵ７、補機類８、および、ブレーキキャパシタ１１に供給する。ＤＣ／ＤＣコンバータ３と、補機バッテリ２、ＨＶ−ＥＣＵ５、ＥＮＧ−ＥＣＵ６、エアコンＥＣＵ７、補機類８、および、ブレーキキャパシタ１１との間には、ヒューズの一種であるヒュージブルリンクホルダー（ＦＬホルダー）４が設けられており、ＤＣ／ＤＣコンバータ３で降圧された電圧が補機バッテリ２、ブレーキキャパシタ１１および各機器５〜８に分岐される。なお、ブレーキキャパシタ１１は、図示しないブレーキシステムの異常時に非常用として電力を供給するための電力源である。   A high-power battery (high voltage battery) 1 is a main battery that supplies electric power to a vehicle driving motor (not shown). The DC / DC converter 3 steps down the voltage of the high-power battery 1 based on a voltage command from the HV-ECU 5 to be described later, and the auxiliary battery 2, the HV-ECU 5, the ENG-ECU 6, the air conditioner ECU 7, and the auxiliary machines 8 And to the brake capacitor 11. Between the DC / DC converter 3 and the auxiliary battery 2, the HV-ECU 5, the ENG-ECU 6, the air conditioner ECU 7, the auxiliary machines 8, and the brake capacitor 11, a fusible link holder (FL Holder) 4 is provided, and the voltage stepped down by the DC / DC converter 3 is branched to the auxiliary battery 2, the brake capacitor 11, and the devices 5-8. The brake capacitor 11 is a power source for supplying power as an emergency when a brake system (not shown) is abnormal.

補機バッテリ（低電圧バッテリ）２は、車両の走行中に、常時充電が行われる。また、ＤＣ／ＤＣコンバータ３の非作動時（イグニッションオンが行われている間、および、イグニッションオフが行われている間）には、補機類８に電力を供給する。   The auxiliary battery (low voltage battery) 2 is always charged while the vehicle is running. Further, when the DC / DC converter 3 is not in operation (while the ignition is being turned on and while the ignition is being turned off), power is supplied to the auxiliary machinery 8.

エンジン冷却水温センサ９は、所定時間ごとに、エンジン冷却水（不図示）の温度Ｔａを検出して、ＥＮＧ−ＥＣＵ６に出力する。ＥＮＧ−ＥＣＵ６は、図示しないエンジンの各種制御を行うとともに、エンジン冷却水温センサ９によって検出されるエンジン冷却水温Ｔａを、ＨＶ−ＥＣＵ５に出力する。   The engine coolant temperature sensor 9 detects a temperature Ta of engine coolant (not shown) at predetermined time intervals and outputs it to the ENG-ECU 6. The ENG-ECU 6 performs various controls of the engine (not shown) and outputs the engine cooling water temperature Ta detected by the engine cooling water temperature sensor 9 to the HV-ECU 5.

外気温センサ１０は、例えば、フロントバンパ近辺に設けられており、所定時間ごとに、車室外の温度Ｔｂを検出して、エアコンＥＣＵ７に出力する。エアコンＥＣＵ７は、エアコンシステム（不図示）の各種制御を行うとともに、外気温センサ１０によって検出される外気温Ｔｂを、ＨＶ−ＥＣＵ５に出力する。   The outside air temperature sensor 10 is provided, for example, in the vicinity of the front bumper, and detects the temperature Tb outside the passenger compartment and outputs it to the air conditioner ECU 7 at predetermined time intervals. The air conditioner ECU 7 performs various controls of an air conditioner system (not shown) and outputs the outside air temperature Tb detected by the outside air temperature sensor 10 to the HV-ECU 5.

ＨＶ−ＥＣＵ５は、ＣＰＵ５ａ、メモリ５ｂ、タイマ５ｃ、および、タイマ５ｄを備え、ハイブリッド車全体の各種制御を行う。ＨＶ−ＥＣＵ５は、特に、ＥＮＧ−ＥＣＵ６から入力されるエンジン冷却水温Ｔａ、および、エアコンＥＣＵ７から入力される外気温Ｔｂに基づいて、後述する方法により、補機バッテリ２の目標充電電圧を決定する。また、ＨＶ−ＥＣＵ５は、算出した目標充電電圧と、ヒュージブルリンクホルダー４から補機バッテリ２へと出力される充電電圧との偏差に基づいて、電圧指令値を求めて、ＤＣ／ＤＣコンバータ３に出力する。   The HV-ECU 5 includes a CPU 5a, a memory 5b, a timer 5c, and a timer 5d, and performs various controls of the entire hybrid vehicle. The HV-ECU 5 determines the target charging voltage of the auxiliary battery 2 by a method to be described later based on the engine cooling water temperature Ta input from the ENG-ECU 6 and the outside air temperature Tb input from the air conditioner ECU 7 in particular. . Further, the HV-ECU 5 obtains a voltage command value based on the deviation between the calculated target charging voltage and the charging voltage output from the fusible link holder 4 to the auxiliary battery 2, and the DC / DC converter 3. Output to.

一実施の形態における車両用バッテリの充電制御装置では、補機バッテリ２の温度を検出するための温度センサを設けずに、エンジン冷却水温Ｔａおよび外気温Ｔｂに基づいて、補機バッテリ２の状態を推定して、補機バッテリ２の目標充電電圧を決定する。特に、エンジン冷却水温Ｔａおよび外気温Ｔｂに基づいて、補機バッテリ２の温度が低いと判断すると、目標充電電圧を高く設定し、補機バッテリ２の温度が高いと判断すると、目標充電電圧を低く設定する。   In the vehicle battery charging control apparatus according to the embodiment, the state of the auxiliary battery 2 is determined based on the engine cooling water temperature Ta and the outside air temperature Tb without providing a temperature sensor for detecting the temperature of the auxiliary battery 2. And the target charging voltage of the auxiliary battery 2 is determined. In particular, if it is determined that the temperature of the auxiliary battery 2 is low based on the engine coolant temperature Ta and the outside air temperature Tb, the target charging voltage is set high, and if the auxiliary battery 2 is determined to be high, the target charging voltage is set. Set low.

図２は、一実施の形態における車両用バッテリの充電制御装置によって行われる処理内容を示すフローチャートである。ＨＶ−ＥＣＵ５は、電源がオンされシステム起動状態になると、所定の時間（例えば、５００msec）ごとに、ステップＳ１０の処理を開始する。ステップＳ１０では、エンジン冷却水温センサ９によって検出されるエンジン冷却水温Ｔａ、および、外気温センサ１０によって検出される外気温Ｔｂの取得を開始する。ここで、車両起動後に取得したエンジン冷却水温の初期値Ｔａ０、および、外気温の初期値Ｔｂ０は、メモリ５ｂに格納する。   FIG. 2 is a flowchart showing the contents of processing performed by the vehicle battery charging control apparatus according to the embodiment. When the power is turned on and the system is activated, the HV-ECU 5 starts the process of step S10 every predetermined time (for example, 500 msec). In step S10, acquisition of the engine cooling water temperature Ta detected by the engine cooling water temperature sensor 9 and the outside air temperature Tb detected by the outside air temperature sensor 10 is started. Here, the initial value Ta0 of the engine coolant temperature and the initial value Tb0 of the outside air temperature acquired after the vehicle start-up are stored in the memory 5b.

ステップＳ１０に続くステップＳ２０では、メモリ５ｂに格納した外気温の初期値Ｔｂ０が所定温度Ｔ１以上であるか否かを判定する。所定温度Ｔ１は、例えば、０℃である。外気温の初期値Ｔｂ０が所定温度Ｔ１未満であると判定するとステップＳ５０に進み、所定温度Ｔ１以上であると判定すると、タイマ５ｃをスタートさせて、ステップＳ３０に進む。   In step S20 following step S10, it is determined whether or not the initial value Tb0 of the outside air temperature stored in the memory 5b is equal to or higher than a predetermined temperature T1. The predetermined temperature T1 is, for example, 0 ° C. If it is determined that the initial value Tb0 of the outside air temperature is lower than the predetermined temperature T1, the process proceeds to step S50. If it is determined that the initial value Tb0 is equal to or higher than the predetermined temperature T1, the timer 5c is started and the process proceeds to step S30.

ステップＳ３０では、タイマ５ｃの計測時間が所定時間Ｔｍ１（例えば、１５０sec）を経過したか否かを判定する。後述するように、補機バッテリ２の暖機が完了していない場合には、補機バッテリ２の目標充電電圧が基準充電電圧Ｖ２より高い値に設定される。すなわち、車両起動後は、少なくとも所定時間Ｔｍ１の間、基準充電電圧Ｖ２より高い目標充電電圧で補機バッテリ２の充電が行われるとともに、ブレーキキャパシタ１１の充電が行われることになり、これにより、長期放置による補機バッテリ２の放電量を回復させるとともに、ブレーキキャパシタ１１の充電を行うことができる。所定時間Ｔｍ１は、基準充電電圧Ｖ２より高い目標充電電圧で補機バッテリ２の充電を行う際に、長期放置による補機バッテリ２の放電量を回復させることができる時間を実験などによって求めて、予め設定しておく。   In step S30, it is determined whether or not the measurement time of the timer 5c has passed a predetermined time Tm1 (for example, 150 seconds). As will be described later, when the warm-up of the auxiliary battery 2 is not completed, the target charging voltage of the auxiliary battery 2 is set to a value higher than the reference charging voltage V2. That is, after starting the vehicle, the auxiliary battery 2 is charged at a target charging voltage higher than the reference charging voltage V2 for at least the predetermined time Tm1, and the brake capacitor 11 is charged. It is possible to recover the discharge amount of the auxiliary battery 2 due to being left for a long time and to charge the brake capacitor 11. The predetermined time Tm1 is obtained by an experiment or the like to determine a time during which the discharge amount of the auxiliary battery 2 can be recovered by being left for a long time when charging the auxiliary battery 2 at a target charging voltage higher than the reference charging voltage V2. Set in advance.

ステップＳ３０において、タイマ５ｃの計測時間が所定時間Ｔｍ１を経過していないと判定するとステップＳ９０に進み、所定時間Ｔｍ１を経過したと判定すると、タイマ５ｃの計測値をリセットして、ステップＳ４０に進む。ステップＳ４０では、補機バッテリ２の暖機が完了したと判定して、暖機完了フラグｆｌｇＡを１にセットして、ステップＳ９０に進む。なお、暖機完了フラグｆｌｇＡの初期値は０である。   If it is determined in step S30 that the measurement time of the timer 5c has not elapsed the predetermined time Tm1, the process proceeds to step S90. If it is determined that the predetermined time Tm1 has elapsed, the measurement value of the timer 5c is reset and the process proceeds to step S40. . In step S40, it is determined that the warm-up of the auxiliary battery 2 is completed, the warm-up completion flag flgA is set to 1, and the process proceeds to step S90. The initial value of the warm-up completion flag flgA is 0.

一方、ステップＳ５０では、メモリ５ｂに格納したエンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２以上であるか否かを判定する。所定温度Ｔ２は、例えば、５０℃である。エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２以上である判定すると、タイマ５ｃをスタートさせて、ステップＳ３０に進む。すなわち、外気温の初期値Ｔｂ０が所定温度Ｔ１未満であるが、エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２以上である場合には、前回の車両走行終了時からの経過時間が短く、補機バッテリ２の放電は進んでいないと判定する。一方、エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２未満であると判定すると、ステップＳ６０に進む。   On the other hand, in step S50, it is determined whether or not the initial value Ta0 of the engine coolant temperature stored in the memory 5b is equal to or higher than a predetermined temperature T2. The predetermined temperature T2 is, for example, 50 ° C. If it is determined that the initial value Ta0 of the engine coolant temperature is equal to or higher than the predetermined temperature T2, the timer 5c is started and the process proceeds to step S30. That is, when the initial value Tb0 of the outside air temperature is less than the predetermined temperature T1, but the initial value Ta0 of the engine cooling water temperature is equal to or higher than the predetermined temperature T2, the elapsed time from the end of the previous vehicle travel is short, and the auxiliary machine It is determined that the battery 2 is not discharged. On the other hand, when it is determined that the initial value Ta0 of the engine coolant temperature is lower than the predetermined temperature T2, the process proceeds to step S60.

ステップＳ６０では、ＥＮＧ−ＥＣＵ６から入力されるエンジン冷却水温Ｔａが所定温度Ｔ２以上となったか否かを判定する。エンジン冷却水温Ｔａが所定温度Ｔ２以上に上昇したと判定すると、タイマ５ｄをスタートさせて、ステップＳ７０に進み、所定温度Ｔ２未満であると判定すると、ステップＳ９０に進む。   In step S60, it is determined whether the engine coolant temperature Ta input from the ENG-ECU 6 has become equal to or higher than a predetermined temperature T2. If it is determined that the engine coolant temperature Ta has risen to the predetermined temperature T2 or higher, the timer 5d is started, and the process proceeds to step S70. If it is determined that the engine cooling water temperature Ta is lower than the predetermined temperature T2, the process proceeds to step S90.

ステップ７０では、タイマ５ｄの計測時間が所定時間Ｔｍ２（例えば、３００sec）を経過したか否かを判定する。タイマ５ｄの計測時間が所定時間Ｔｍ２を経過していないと判定するとステップＳ９０に進み、所定時間Ｔｍ２を経過したと判定すると、タイマ５ｄの計測値をリセットして、ステップＳ８０に進む。ステップＳ８０では、補機バッテリ２の暖機が完了したと判定して、暖機完了フラグｆｌｇＢを１にセットして、ステップＳ９０に進む。なお、暖機完了フラグｆｌｇＢの初期値は０である。   In step 70, it is determined whether or not the measurement time of the timer 5d has passed a predetermined time Tm2 (for example, 300 seconds). If it is determined that the measurement time of the timer 5d has not elapsed the predetermined time Tm2, the process proceeds to step S90. If it is determined that the predetermined time Tm2 has elapsed, the measurement value of the timer 5d is reset, and the process proceeds to step S80. In step S80, it is determined that the warm-up of the auxiliary battery 2 has been completed, the warm-up completion flag flgB is set to 1, and the process proceeds to step S90. Note that the initial value of the warm-up completion flag flgB is zero.

ステップＳ９０では、暖機完了フラグｆｌｇＡおよびｆｌｇＢのうちの少なくとも一方のフラグが１にセットされているか否かを判定する。暖機完了フラグｆｌｇＡおよびフラグｆｌｇＢがともに０にセットされていると判定すると、補機バッテリ２の暖機が完了していないと判定して、ステップＳ１３０に進む。一方、暖機完了フラグｆｌｇＡおよびｆｌｇＢのうちの少なくとも一方のフラグが１にセットされていると判定すると、補機バッテリ２の暖機が完了したと判定して、ステップＳ１００に進む。   In step S90, it is determined whether or not at least one of the warm-up completion flags flgA and flgB is set to 1. If it is determined that both the warm-up completion flag flgA and the flag flgB are set to 0, it is determined that the warm-up of the auxiliary battery 2 has not been completed, and the process proceeds to step S130. On the other hand, if it is determined that at least one of warm-up completion flags flgA and flgB is set to 1, it is determined that warm-up of auxiliary battery 2 has been completed, and the process proceeds to step S100.

ステップＳ１００では、エアコンＥＣＵ７から入力される外気温Ｔｂが所定温度Ｔ３以上であるか否かを判定する。所定温度Ｔ３は、例えば、４５℃である。外気温Ｔｂが所定温度Ｔ３以上であると判定するとステップＳ１２０に進み、所定温度Ｔ３未満であると判定すると、ステップＳ１１０に進む。   In step S100, it is determined whether or not the outside air temperature Tb input from the air conditioner ECU 7 is equal to or higher than a predetermined temperature T3. The predetermined temperature T3 is 45 ° C., for example. If it is determined that the outside air temperature Tb is equal to or higher than the predetermined temperature T3, the process proceeds to step S120, and if it is determined that it is lower than the predetermined temperature T3, the process proceeds to step S110.

ステップＳ１１０では、補機バッテリ２の目標充電電圧をＶ２に設定する。この目標充電電圧Ｖ２は、通常制御時の基準充電電圧であり、例えば、１４．１Ｖである。一方、ステップＳ１２０では、補機バッテリ２の目標充電電圧をＶ１（Ｖ１＜Ｖ２であり、例えば、１３．７Ｖ）に設定する。すなわち、バッテリの温度が高くなると、電解液が気化するガッシングが生じやすくなるため、ガッシングを防ぐために、補機バッテリ２の目標充電電圧を基準充電電圧Ｖ２より低いＶ１に設定する。目標充電電圧Ｖ１は、ガッシングが発生しない充電電圧を予め実験などを行うことによって設定しておく。   In step S110, the target charging voltage of the auxiliary battery 2 is set to V2. This target charging voltage V2 is a reference charging voltage during normal control, and is, for example, 14.1V. On the other hand, in step S120, the target charging voltage of the auxiliary battery 2 is set to V1 (V1 <V2, for example, 13.7V). That is, as the temperature of the battery increases, gassing that causes the electrolyte to vaporize is likely to occur. Therefore, in order to prevent gassing, the target charging voltage of the auxiliary battery 2 is set to V1 that is lower than the reference charging voltage V2. The target charging voltage V1 is set by performing an experiment or the like in advance on a charging voltage at which no gassing occurs.

ステップＳ１３０では、メモリ５ｂに格納した外気温の初期値Ｔｂ０が所定温度Ｔ１（例えば、０℃）以上であるか否かを判定する。外気温の初期値Ｔｂ０が所定温度Ｔ１未満であると判定するとステップＳ１４０に進み、所定温度Ｔ１以上であると判定すると、ステップＳ１５０に進む。   In step S130, it is determined whether or not the initial value Tb0 of the outside air temperature stored in the memory 5b is equal to or higher than a predetermined temperature T1 (for example, 0 ° C.). If it is determined that the initial value Tb0 of the outside air temperature is lower than the predetermined temperature T1, the process proceeds to step S140. If it is determined that the initial value Tb0 is equal to or higher than the predetermined temperature T1, the process proceeds to step S150.

ステップＳ１４０では、補機バッテリ２の目標充電電圧を基準充電電圧Ｖ２より高いＶ４（例えば、１４．８Ｖ）に設定する。すなわち、補機バッテリ２の暖機が完了しておらず、かつ、外気温の初期値Ｔｂ０が所定温度Ｔ１未満であるから、補機バッテリ２の温度は低いと推測できるが、バッテリの温度が低い場合には、充電受け入れ性が悪化するため、目標充電電圧を基準充電電圧より高く設定する。一方、ステップＳ１５０では、補機バッテリ２の暖機が完了していないが、外気温の初期値Ｔｂ０が所定温度Ｔ１以上であるから、補機バッテリ２の目標充電電圧を基準充電電圧Ｖ２より高く、かつ、上述したＶ４より低いＶ３（例えば、１４．５Ｖ）に設定する。   In step S140, the target charging voltage of the auxiliary battery 2 is set to V4 (for example, 14.8V) higher than the reference charging voltage V2. That is, since the warm-up of the auxiliary battery 2 is not completed and the initial value Tb0 of the outside air temperature is less than the predetermined temperature T1, it can be estimated that the temperature of the auxiliary battery 2 is low. If it is low, the charge acceptability deteriorates, so the target charge voltage is set higher than the reference charge voltage. On the other hand, in step S150, the warm-up of the auxiliary battery 2 is not completed, but the initial value Tb0 of the outside air temperature is equal to or higher than the predetermined temperature T1, and therefore the target charging voltage of the auxiliary battery 2 is set higher than the reference charging voltage V2. And V3 (for example, 14.5 V) lower than V4 described above.

一実施の形態における車両用バッテリの充電制御装置による制御内容をまとめておく。一実施の形態における車両用バッテリの充電制御装置では、以下の（１）〜（３）の手順により、補機バッテリ２の目標充電電圧を設定する。
（１）エンジン冷却水温センサ９によって検出されるエンジン冷却水温Ｔａおよび外気温センサ１０によって検出される外気温Ｔｂに基づいて、補機バッテリ２の暖機が完了したか否かを判定する。特に、以下の（ａ），（ｂ），（ｃ）のいずれか１つの条件が成立した時に、補機バッテリ２の暖機が完了したと判定する。ただし、補機バッテリ２の暖機が完了していないと判定されている間は、基準充電電圧Ｖ２より高い目標充電電圧で補機バッテリ２の充電が行われる。
（ａ）外気温の初期値Ｔｂ０が所定温度Ｔ１（例えば、０℃）以上であることを検出してから、所定時間Ｔｍ１（例えば、１５０sec）経過
（ｂ）エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２（例えば、５０℃）以上であるこを検出してから、所定時間Ｔｍ１（例えば、１５０sec）経過
（ｃ）エンジン冷却水温Ｔａが所定温度Ｔ２（例えば、５０℃）以上に上昇したことを検出してから、所定時間Ｔｍ２（例えば、３００sec）経過 The contents of control by the vehicle battery charge control device in one embodiment will be summarized. In the vehicle battery charge control apparatus according to the embodiment, the target charge voltage of the auxiliary battery 2 is set by the following procedures (1) to (3).
(1) Based on the engine cooling water temperature Ta detected by the engine cooling water temperature sensor 9 and the outside air temperature Tb detected by the outside air temperature sensor 10, it is determined whether or not the auxiliary battery 2 has been warmed up. In particular, when any one of the following conditions (a), (b), and (c) is satisfied, it is determined that the warm-up of the auxiliary battery 2 is completed. However, while it is determined that the warm-up of the auxiliary battery 2 is not completed, the auxiliary battery 2 is charged with a target charging voltage higher than the reference charging voltage V2.
(A) A predetermined time Tm1 (for example, 150 sec) has elapsed since it was detected that the initial value Tb0 of the outside air temperature is equal to or higher than a predetermined temperature T1 (for example, 0 ° C.). Detected that the temperature T2 (for example, 50 ° C.) or higher has elapsed, and then passed a predetermined time Tm1 (for example, 150 seconds). (C) Detected that the engine cooling water temperature Ta has risen to a predetermined temperature T2 (for example, 50 ° C.) Elapse of a predetermined time Tm2 (for example, 300 sec)

（２）補機バッテリ２の暖機が完了していないと判定すると、補機バッテリ２の目標充電電圧を基準充電電圧Ｖ２（例えば、１４．１Ｖ）より高い電圧値に設定する。特に、外気温の初期値Ｔｂ０が所定温度Ｔ１（例えば、０℃）未満であれば、目標充電電圧をＶ４（例えば、１４．８Ｖ）に設定し、外気温の初期値Ｔｂ０が所定温度Ｔ１以上であれば、目標充電電圧をＶ３（例えば、１４．５Ｖ）に設定する。   (2) When it is determined that the auxiliary battery 2 has not been warmed up, the target charging voltage of the auxiliary battery 2 is set to a voltage value higher than a reference charging voltage V2 (for example, 14.1 V). In particular, if the initial value Tb0 of the outside air temperature is less than a predetermined temperature T1 (for example, 0 ° C.), the target charging voltage is set to V4 (for example, 14.8 V), and the initial value Tb0 of the outside temperature is equal to or higher than the predetermined temperature T1. If so, the target charging voltage is set to V3 (for example, 14.5V).

（３）補機バッテリ２の暖機が完了したと判定すると、補機バッテリ２の目標充電電圧を、上述した目標充電電圧Ｖ３またはＶ４より低くする。特に、外気温センサ１０によって検出される外気温Ｔｂが所定温度Ｔ３（例えば、４５℃）未満であれば、目標充電電圧を基準充電電圧Ｖ２に設定し、外気温Ｔｂが所定温度Ｔ３以上であれば、目標充電電圧をＶ１（例えば、１３．７Ｖ）に設定する。   (3) When it is determined that the auxiliary battery 2 has been warmed up, the target charging voltage of the auxiliary battery 2 is made lower than the target charging voltage V3 or V4 described above. In particular, if the outside air temperature Tb detected by the outside air temperature sensor 10 is less than a predetermined temperature T3 (for example, 45 ° C.), the target charging voltage is set to the reference charging voltage V2, and the outside air temperature Tb is equal to or higher than the predetermined temperature T3. For example, the target charging voltage is set to V1 (for example, 13.7 V).

一実施の形態における車両用バッテリの充電制御装置によれば、エンジン冷却水温センサ９によって検出されるエンジン冷却水温Ｔａおよび外気温センサ１０によって検出される外気温Ｔｂに基づいて、補機バッテリ２（低電圧バッテリ）の目標充電電圧を設定し、設定した目標充電電圧に基づいて、強電バッテリ１（高電圧バッテリ）の電圧をＤＣ／ＤＣコンバータ３で降圧して低電圧バッテリに供給する。これにより、補機バッテリ２の温度を検出するための温度センサを設ける必要がないので、システム全体のコストを低減させることができる。なお、エンジン冷却水温センサ９や外気温センサ１０は、一般的な車両に備え付けられているセンサを用いることができる。   According to the vehicle battery charge control apparatus in the embodiment, the auxiliary battery 2 (based on the engine cooling water temperature Ta detected by the engine cooling water temperature sensor 9 and the outside air temperature Tb detected by the outside air temperature sensor 10. The target charging voltage of the low voltage battery) is set, and the voltage of the high voltage battery 1 (high voltage battery) is stepped down by the DC / DC converter 3 based on the set target charging voltage and supplied to the low voltage battery. Thereby, since it is not necessary to provide a temperature sensor for detecting the temperature of the auxiliary battery 2, the cost of the entire system can be reduced. In addition, the engine cooling water temperature sensor 9 and the outside air temperature sensor 10 can use the sensor with which the general vehicle was equipped.

また、一実施の形態における車両用バッテリの充電制御装置によれば、エンジン冷却水温センサ９によって検出されるエンジン冷却水温Ｔａおよび外気温センサ１０によって検出される外気温Ｔｂに基づいて、補機バッテリ２（低電圧バッテリ）の暖機が完了したか否かを判定し、補機バッテリ２の暖機が完了していないと判定した場合の目標充電電圧を、暖機が完了したと判定した場合の目標充電電圧より高く設定する。これにより、補機バッテリ２の充電受け入れ性が低下している状態の時に、目標充電電圧を高めに設定することができるので、補機バッテリ２の状態に基づいた適切な充電を行うことができる。   Further, according to the vehicle battery charge control apparatus in the embodiment, the auxiliary battery is based on the engine cooling water temperature Ta detected by the engine cooling water temperature sensor 9 and the outside air temperature Tb detected by the outside air temperature sensor 10. When it is determined whether or not the warm-up of the auxiliary battery 2 has been completed, it is determined whether or not the warm-up of the auxiliary battery 2 has been completed. Set higher than the target charging voltage. As a result, when the charge acceptability of the auxiliary battery 2 is reduced, the target charging voltage can be set higher, so that appropriate charging based on the state of the auxiliary battery 2 can be performed. .

一実施の形態における車両用バッテリの充電制御装置によれば、外気温センサ１０によって検出される外気温が所定温度Ｔ１以上であると判定してから所定時間Ｔｍ１を経過すると、補機バッテリ２の暖機が完了したと判定するので、補機バッテリ２の温度を検出するための温度センサを設けることなく、補機バッテリ２の暖機が完了したか否かを判定することができる。   According to the vehicle battery charge control device in the embodiment, when the predetermined time Tm1 has elapsed since it was determined that the outside air temperature detected by the outside air temperature sensor 10 is equal to or higher than the predetermined temperature T1, the auxiliary battery 2 Since it is determined that the warm-up has been completed, it is possible to determine whether or not the warm-up of the auxiliary battery 2 has been completed without providing a temperature sensor for detecting the temperature of the auxiliary battery 2.

また、一実施の形態における車両用バッテリの充電制御装置によれば、エンジン冷却水温センサ９によって検出されるエンジン冷却水温が所定温度Ｔ２以上であると判定してから所定時間Ｔｍ１を経過すると、補機バッテリ２の暖機が完了したと判定するので、補機バッテリ２の温度を検出するための温度センサを設けることなく、補機バッテリ２の暖機が完了したか否かを判定することができる。   In addition, according to the vehicle battery charge control device in the embodiment, when the engine cooling water temperature detected by the engine cooling water temperature sensor 9 is determined to be equal to or higher than the predetermined temperature T2, when the predetermined time Tm1 elapses, the compensation is performed. Since it is determined that the warm-up of the auxiliary battery 2 has been completed, it is possible to determine whether or not the warm-up of the auxiliary battery 2 has been completed without providing a temperature sensor for detecting the temperature of the auxiliary battery 2. it can.

さらに、一実施の形態における車両用バッテリの充電制御装置によれば、車両始動後に、エンジン冷却水温センサ９によって検出されるエンジン冷却水温が所定温度Ｔ２以上に上昇したと判定してから所定時間Ｔｍ２を経過すると、補機バッテリ２の暖機が完了したと判定するので、補機バッテリ２の温度を検出するための温度センサを設けることなく、補機バッテリ２の暖機が完了したか否かを判定することができる。   Furthermore, according to the vehicle battery charge control device in the embodiment, after the vehicle is started, it is determined that the engine coolant temperature detected by the engine coolant temperature sensor 9 has risen to the predetermined temperature T2 or more, and then the predetermined time Tm2. When it is determined that the auxiliary battery 2 has been warmed up, it is determined whether or not the auxiliary battery 2 has been warmed up without providing a temperature sensor for detecting the temperature of the auxiliary battery 2. Can be determined.

一実施の形態における車両用バッテリの充電制御装置によれば、補機バッテリ２の暖機が完了したと判定した場合に、外気温センサ１０によって検出される外気温が所定温度Ｔ３以上である場合の目標充電電圧を、外気温センサ１０によって検出される外気温が所定温度Ｔ３より低い場合の目標充電電圧より低く設定する。これにより、補機バッテリ２の状態に基づいた適切な充電を行うことができる。   According to the vehicle battery charge control device in the embodiment, when it is determined that the warm-up of the auxiliary battery 2 is completed, the outside air temperature detected by the outside air temperature sensor 10 is equal to or higher than the predetermined temperature T3. Is set lower than the target charging voltage when the outside air temperature detected by the outside air temperature sensor 10 is lower than the predetermined temperature T3. Thereby, appropriate charge based on the state of the auxiliary battery 2 can be performed.

また、一実施の形態における車両用バッテリの充電制御装置によれば、補機バッテリ２の暖機が完了していない場合に、車両始動時に外気温センサ１０によって検出される外気温が所定温度より低い場合の目標充電電圧を、車両始動時に外気温センサ１０によって検出される外気温が所定温度以上である場合の目標充電電圧以上の値に設定するので、補機バッテリ２の状態に基づいた適切な充電を行うことができる。   Further, according to the vehicle battery charge control device in the embodiment, when the auxiliary battery 2 has not been warmed up, the outside air temperature detected by the outside air temperature sensor 10 at the start of the vehicle is lower than the predetermined temperature. Since the target charging voltage when the vehicle temperature is low is set to a value equal to or higher than the target charging voltage when the outside air temperature detected by the outside air temperature sensor 10 at the time of starting the vehicle is equal to or higher than a predetermined temperature, the target charging voltage is appropriately Can be recharged.

本発明は、上述した一実施の形態に限定されることはない。例えば、図２に示すフローチャートのステップＳ１４０で設定する目標充電電圧Ｖ４を、ステップＳ１５０で設定する目標充電電圧Ｖ３より高い値としたが、Ｖ３と同じ値としてもよい。   The present invention is not limited to the embodiment described above. For example, the target charging voltage V4 set in step S140 of the flowchart shown in FIG. 2 is set to a value higher than the target charging voltage V3 set in step S150, but may be the same value as V3.

図２に示すフローチャートでは、外気温の初期値Ｔｂ０が所定温度Ｔ１未満であるが、エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２以上である場合には、ステップＳ３０に進んで、所定時間Ｔｍ１を経過したか否かを判定したが、この場合の所定時間をＴｍ１とは異なる値Ｔｍ３に設定しておいてもよい。また、ステップＳ１３０で外気温の初期値Ｔｂ０と比較する所定温度も、Ｔ１とは異なる温度Ｔ４としてもよい。   In the flowchart shown in FIG. 2, the initial value Tb0 of the outside air temperature is less than the predetermined temperature T1, but if the initial value Ta0 of the engine coolant temperature is equal to or higher than the predetermined temperature T2, the process proceeds to step S30 and the predetermined time Tm1 is set. Although it has been determined whether or not it has elapsed, the predetermined time in this case may be set to a value Tm3 different from Tm1. In addition, the predetermined temperature to be compared with the initial value Tb0 of the outside air temperature in step S130 may be a temperature T4 different from T1.

上述した一実施の形態では、上述した（ａ）〜（ｃ）の条件のうち、いずれか１つの条件が成立すると、補機バッテリ２の暖機が完了したと判定したが、補機バッテリ２が十分暖まっていると判定できる状態、例えば、補機バッテリ２の温度が所定温度以上であると推定できる状態であれば、補機バッテリ２の暖機が完了したと判定することができる。すなわち、補機バッテリ２の暖機が完了したか否かの判断条件は、上述した（ａ）〜（ｃ）の条件に限定されることはない。   In the above-described embodiment, when any one of the above-described conditions (a) to (c) is satisfied, it is determined that the warm-up of the auxiliary battery 2 is completed. Can be determined to be sufficiently warm, for example, if it can be estimated that the temperature of the auxiliary battery 2 is equal to or higher than a predetermined temperature, it can be determined that the warming of the auxiliary battery 2 has been completed. That is, the condition for determining whether or not the auxiliary battery 2 has been warmed up is not limited to the above-described conditions (a) to (c).

上述した一実施の形態では、外気温の初期値Ｔｂ０が所定温度Ｔ１未満であり、かつ、エンジン冷却水温の初期値Ｔａ０が所定温度Ｔ２未満の場合でも、その後に、エンジン冷却水温Ｔａが所定温度Ｔ２以上となってから、所定時間Ｔｍ２を経過すると、補機バッテリ２の暖機が完了したと判定した。しかし、補機バッテリ２の暖機が完了したと判定するまでは、基準充電電圧Ｖ２より高い目標充電電圧にて補機バッテリ２の充電を行うので、バッテリ保護のために、例えば、図２に示すフローチャートのステップＳ６０の判定を否定してから所定時間（例えば、９００sec）を経過すると、暖機が完了したと判定して、目標充電電圧を下げるようにしてもよい。   In the above-described embodiment, even when the initial value Tb0 of the outside air temperature is lower than the predetermined temperature T1 and the initial value Ta0 of the engine cooling water temperature is lower than the predetermined temperature T2, the engine cooling water temperature Ta is thereafter set to the predetermined temperature. When the predetermined time Tm2 has elapsed after becoming T2 or more, it is determined that the auxiliary battery 2 has been warmed up. However, the auxiliary battery 2 is charged at a target charging voltage higher than the reference charging voltage V2 until it is determined that the auxiliary battery 2 has been warmed up. For battery protection, for example, FIG. When a predetermined time (for example, 900 seconds) has elapsed since the determination in step S60 in the flowchart shown is denied, it may be determined that the warm-up has been completed and the target charging voltage may be lowered.

特許請求の範囲の構成要素と一実施の形態の構成要素との対応関係は次の通りである。すなわち、外気温センサ１０が外気温検出手段を、エンジン冷却水温センサ９がエンジン冷却水温検出手段を、ＨＶ−ＥＣＵ５が充電電圧設定手段および制御手段を、ＤＣ／ＤＣコンバータ３が電圧変換手段をそれぞれ構成する。なお、以上の説明はあくまで一例であり、発明を解釈する上で、上記の実施形態の構成要素と本発明の構成要素との対応関係に何ら限定されるものではない。   The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the outside air temperature sensor 10 is the outside air temperature detecting means, the engine cooling water temperature sensor 9 is the engine cooling water temperature detecting means, the HV-ECU 5 is the charging voltage setting means and the controlling means, and the DC / DC converter 3 is the voltage converting means. Constitute. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

一実施の形態における車両用バッテリの充電制御装置の全体構成を示す図The figure which shows the whole structure of the charge control apparatus of the battery for vehicles in one embodiment. 一実施の形態における車両用バッテリの充電制御装置によって行われる処理内容を示すフローチャートThe flowchart which shows the processing content performed by the charge control apparatus of the vehicle battery in one embodiment.

符号の説明Explanation of symbols

１…強電バッテリ、２…補機バッテリ、３…ＤＣ／ＤＣコンバータ、４…ヒュージブルリンクホルダー、５…ＨＶ−ＥＣＵ、６…ＥＮＧ−ＥＣＵ、７…エアコンＥＣＵ、８…補機類、９…エンジン冷却水温センサ、１０…外気温センサ、１１…ブレーキキャパシタ DESCRIPTION OF SYMBOLS 1 ... Strong battery, 2 ... Auxiliary battery, 3 ... DC / DC converter, 4 ... Fusible link holder, 5 ... HV-ECU, 6 ... ENG-ECU, 7 ... Air-conditioner ECU, 8 ... Auxiliary machinery, 9 ... Engine coolant temperature sensor, 10 ... Outside air temperature sensor, 11 ... Brake capacitor

Claims (8)

車外の外気温度を検出する外気温検出手段と、
エンジン冷却水の温度を検出するエンジン冷却水温検出手段と、
前記外気温検出手段によって検出される外気温と、前記エンジン冷却水温検出手段によって検出されるエンジン冷却水温とに基づいて、低電圧バッテリの目標充電電圧を設定する充電電圧設定手段と、
前記目標充電電圧設定手段によって設定された目標充電電圧に基づいて、高電圧バッテリの電圧を降圧して前記低電圧バッテリに供給する電圧変換手段とを備えることを特徴とする車両用バッテリの充電制御装置。 Outside air temperature detecting means for detecting outside air temperature outside the vehicle;
Engine cooling water temperature detecting means for detecting the temperature of the engine cooling water;
Charging voltage setting means for setting a target charging voltage of the low voltage battery based on the outside air temperature detected by the outside air temperature detecting means and the engine cooling water temperature detected by the engine cooling water temperature detecting means;
Vehicular battery charging control comprising: voltage converting means for stepping down the voltage of the high voltage battery and supplying the voltage to the low voltage battery based on the target charging voltage set by the target charging voltage setting means apparatus. 請求項１に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、前記外気温検出手段によって検出される外気温と、前記エンジン冷却水温検出手段によって検出されるエンジン冷却水温とに基づいて、前記低電圧バッテリの暖機が完了したか否かを判定し、前記低電圧バッテリの暖機が完了していないと判定した場合の目標充電電圧を、前記暖機が完了したと判定した場合の目標充電電圧より高く設定することを特徴とする車両用バッテリの充電制御装置。 The vehicle battery charge control device according to claim 1,
The charging voltage setting means determines whether the low-voltage battery has been warmed up based on the outside air temperature detected by the outside air temperature detecting means and the engine cooling water temperature detected by the engine cooling water temperature detecting means. And setting a target charging voltage when it is determined that the warm-up of the low-voltage battery is not completed higher than a target charging voltage when it is determined that the warm-up is completed. A charging control device for a vehicle battery. 請求項２に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、車両始動時に前記外気温検出手段によって検出される外気温が所定温度Ｔ１以上であると判定してから所定時間Ｔｍ１を経過すると、前記低電圧バッテリの暖機が完了したと判定することを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to claim 2,
When the charging voltage setting means determines that the outside air temperature detected by the outside air temperature detecting means at the start of the vehicle is equal to or higher than the predetermined temperature T1, the warm-up of the low voltage battery is completed when a predetermined time Tm1 has elapsed. It determines with these, The charge control apparatus of the battery for vehicles. 請求項２または請求項３に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、車両始動時に前記エンジン冷却水温検出手段によって検出されるエンジン冷却水温が所定温度Ｔ２以上であると判定してから所定時間Ｔｍ３を経過すると、前記低電圧バッテリの暖機が完了したと判定することを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to claim 2 or 3,
The charging voltage setting means determines that the engine cooling water temperature detected by the engine cooling water temperature detecting means at the time of starting the vehicle is equal to or higher than a predetermined temperature T2, and when the predetermined time Tm3 has elapsed, the low voltage battery is warmed up. A charging control apparatus for a vehicle battery, characterized in that it is determined to be completed. 請求項２から請求項４のいずれか一項に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、車両始動後に、前記エンジン冷却水温検出手段によって検出されるエンジン冷却水温が所定温度Ｔ２以上に上昇したと判定してから所定時間Ｔｍ２を経過すると、前記低電圧バッテリの暖機が完了したと判定することを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to any one of claims 2 to 4,
When the predetermined time Tm2 elapses after the charging voltage setting means determines that the engine cooling water temperature detected by the engine cooling water temperature detection means has risen to a predetermined temperature T2 or higher after starting the vehicle, the charging voltage setting means It is determined that the machine has been completed. 請求項２から請求項５のいずれか一項に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、前記低電圧バッテリの暖機が完了したと判定した場合に、前記外気温検出手段によって検出される外気温が所定温度Ｔ３以上である場合の目標充電電圧を、前記外気温検出手段によって検出される外気温が所定温度Ｔ３より低い場合の目標充電電圧より低く設定することを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to any one of claims 2 to 5,
The charging voltage setting means determines the target charging voltage when the outside air temperature detected by the outside air temperature detecting means is equal to or higher than a predetermined temperature T3 when the warm-up of the low voltage battery is completed. A vehicle battery charge control device, wherein the outside charge temperature detected by the temperature detection means is set lower than a target charge voltage when the temperature is lower than a predetermined temperature T3. 請求項２から請求項６のいずれか一項に記載の車両用バッテリの充電制御装置において、
前記充電電圧設定手段は、前記低電圧バッテリの暖機が完了していない場合に、車両始動時に前記外気温検出手段によって検出される外気温が所定温度Ｔ４より低い場合の目標充電電圧を、車両始動時に前記外気温検出手段によって検出される外気温が所定温度Ｔ４以上である場合の目標充電電圧以上の値に設定することを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to any one of claims 2 to 6,
The charging voltage setting means sets the target charging voltage when the outside air temperature detected by the outside air temperature detecting means when starting the vehicle is lower than a predetermined temperature T4 when the low voltage battery has not been warmed up, A vehicle battery charge control apparatus, wherein a value equal to or higher than a target charging voltage when the outside air temperature detected by the outside air temperature detecting means at the time of starting is equal to or higher than a predetermined temperature T4 is set. 請求項１から請求項７のいずれか一項に記載の車両用バッテリの充電制御装置において、
前記目標充電電圧設定手段によって設定された目標充電電圧と、前記電圧変換手段から前記低電圧バッテリに供給される電圧との偏差に基づいて、電圧指令値を求め、求めた電圧指令値を前記電圧変換手段に出力することにより、前記電圧変換手段から前記低電圧バッテリに供給される電圧が前記目標充電電圧と一致するように制御する制御手段をさらに備えることを特徴とする車両用バッテリの充電制御装置。 In the vehicle battery charge control device according to any one of claims 1 to 7,
Based on the deviation between the target charging voltage set by the target charging voltage setting means and the voltage supplied from the voltage conversion means to the low-voltage battery, a voltage command value is obtained, and the obtained voltage command value is represented by the voltage. Charge control for a vehicle battery further comprising control means for controlling the voltage supplied from the voltage conversion means to the low voltage battery to match the target charging voltage by outputting to the conversion means apparatus.
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