JP2004194428A

JP2004194428A - Apparatus and method for determining full charge of storage battery, and apparatus and method for estimating remaining capacity of storage battery

Info

Publication number: JP2004194428A
Application number: JP2002359360A
Authority: JP
Inventors: Kiichi Koike; 喜一小池; Shoji Horie; 章二堀江; Koichi Yonemura; 浩一米村
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-12-11
Filing date: 2002-12-11
Publication date: 2004-07-08
Anticipated expiration: 2022-12-11
Also published as: JP3966810B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for determining the full charge of a storage battery which accurately determines the full charge of the storage battery even if a load or the output of a generator is changed. <P>SOLUTION: The apparatus for determining the full charge of the storage battery determines that the battery is fully charged when the charging voltage of the storage battery is a value within a predetermined range, the charging current of the storage battery is a predetermined value or less and the time differentiation of the charging current or a difference value between the charging currents of the previous time and this time is a predetermined value or less. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、蓄電池の満充電判定装置、残存容量推定装置、満充電判定方法及び残存容量推定方法に関する。
【０００２】
【従来の技術】
自動車用蓄電池は、一般的に言ってエンジンを始動させる時に最大の電流を供給し、エンジン回転中はエンジンによって駆動される発電機によって定電圧充電される。自動車用蓄電池の残存容量が小さくなり過ぎると、エンジンを停止させた後、エンジンを再始動させることができない。近年、大気汚染及びエコロジーへの関心の高まりから、不要な排気ガスの排出及びエネルギー消費を抑えるために、短時間の駐停車時でも自動車のエンジンをアイドリング状態にすることなく停止すること（アイドルストップ）が推奨されている。そのため、自動車用蓄電池は、しばしばエンジンを始動させるために大電流を供給する。自動車をアイドルストップした後にエンジンが再始動不能にならないように、蓄電池の充電状態（以下、「ＳＯＣ」と言う。具体的には、蓄電池の残存容量を意味する。）を常に正確に把握している必要がある。
【０００３】
蓄電池のＳＯＣは、満充電時のＳＯＣに満充電後の充放電電流を積算した値を加減算して推定できる。しかし、充放電電流を長時間積算し続けると電流検出誤差が累積しＳＯＣの推定精度が悪くなる。適当なタイミングで蓄電池を充電し、満充電を正確に検出し、ＳＯＣを１００％に設定することが、ＳＯＣの推定精度向上につながる。
【０００４】
特開平６−１８９４６６号公報に従来例１の二次電池システム及び充電方法が開示されている。従来例１の二次電池の充電方法は、初めは二次電池を定電流充電し、充電電圧が設定値に達した後は定電圧充電し、充電電流の時間微分値が設定値を越えたときに満充電と判断する方法である。
【０００５】
特開平７−２３５３３２号公報に従来例２の二次電池の充電方法が開示されている。従来例２の二次電池の充電方法は、二次電池を定電圧充電し、充電電流が設定値以下になったときに充電を中断し、電池の開放電圧を測定し満充電を検出する方法である。
【０００６】
特開２０００−３２４７０２号公報に従来例３のバッテリの放電容量検出方法及びその装置並びに車両用バッテリ制御装置が開示されている。従来例３のバッテリの放電容量検出方法では、負荷の駆動電源となると共に定電圧充電可能な鉛−酸電池（鉛蓄電池）からなるバッテリについて、定電圧充電中に充電電流の時間変化率の絶対値が所定値を下回ったときに満充電判定を行う。
【０００７】
【特許文献１】
特開平６−１８９４６６号公報
【特許文献２】
特開平７−２３５３３２号公報
【特許文献３】
特開２０００−３２４７０２号公報
【０００８】
【発明が解決しようとする課題】
従来例１〜３に開示されている満充電判定方法は、充電電圧及び負荷が比較的安定したシステムにおいて、正確に蓄電池の満充電を判定することができる。しかし、車載用蓄電池及びその満充電判定装置においては、充電器（発電機）の出力電圧及び負荷が自動車の走行の状態等によって短時間に大きく変動するため、従来例１〜３の満充電判定方法では、正確に蓄電池の満充電を判定することができなかった。従来例１〜３の満充電判定方法は蓄電池の充電電流又は充電電流の時間微分値に基づいて蓄電池の満充電を判定するが、車載用蓄電池及びその満充電判定装置においては、判定条件である蓄電池の充電電流及び充電電流の時間微分値が、蓄電池の充電以外の原因によって短時間に大きく変動するからである。そのため、従来例の満充電判定方法を充電電圧又は負荷の変動が大きいシステム（例えば車載用蓄電池及びその満充電判定装置）に適用した場合、正確に満充電を判定することが困難であった。
【０００９】
本発明は、上記従来の問題点を解決するもので、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システムにおいて、蓄電池の満充電判定を高精度に行う満充電判定装置及び満充電判定方法を提供することを目的とする。
【００１０】
本発明は、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システムにおいて、蓄電池の満充電判定を高精度に行い、残存容量を高い精度で推定する残存容量推定装置及び残存容量推定方法を提供することを目的とする。
【００１１】
【課題を解決するための手段】
上記課題を解決するため、本発明は以下の構成を有する。
請求項１に記載の発明は、蓄電池の充電電圧が所定の範囲内の値であり、前記蓄電池の充電電流が所定値以下であり、且つ前記充電電流の時間微分若しくは前記充電電流の前回と今回との差分値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定装置である。
【００１２】
請求項２に記載の発明は、所定回数の若しくは所定時間内に前記充電電圧及び前記充電電流の測定を行った中で請求項１に記載の満充電の判定条件が満たされた回数、割合若しくは時間が所定の値以上であった場合、又は所定時間若しくは所定回数連続して請求項１に記載の満充電の判定条件が満たされた場合、前記蓄電池が満充電であると判定することを特徴とする請求項１に記載の蓄電池の満充電判定装置である。
【００１３】
請求項３に記載の発明は、所定回数の若しくは所定時間内に蓄電池の充電電圧及び充電電流の測定を行った中で、前記充電電圧が所定の範囲内の値であり且つ前記充電電流が所定値以下である電圧電流条件を満たす回数、割合若しくは時間が所定の値以上であり、前記電圧電流条件を満たす場合における前記充電電流の時間微分の平均値若しくは前記充電電流の前回と今回との差分値の平均値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定装置である。
【００１４】
請求項４に記載の発明は、前回の判定から所定時間以上の時間が経過し、且つ新たな充電開始時に前記測定又は前記判定を行うことを特徴とする請求項１から請求項３のいずれかの請求項に記載の蓄電池の満充電判定装置である。
【００１５】
請求項５に記載の発明は、前記蓄電池が自動車用鉛蓄電池であり、前記自動車用鉛蓄電池及び満充電判定装置が自動車に搭載されていることを特徴とする請求項１から請求項４のいずれかの請求項に記載の蓄電池の満充電判定装置である。
【００１６】
請求項６に記載の発明は、請求項１から請求項５のいずれかの請求項に記載の満充電判定装置と、前記満充電判定装置が満充電であると判定した時、前記蓄電池の残存容量を１００％に設定する残存容量推定部と、を有することを特徴とする蓄電池の残存容量推定装置である。
【００１７】
請求項７に記載の発明は、蓄電池の充電電圧が所定の範囲内の値であり、前記蓄電池の充電電流が所定値以下であり、且つ前記充電電流の時間微分若しくは前記充電電流の前回と今回との差分値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定方法である。
【００１８】
請求項８に記載の発明は、所定回数の若しくは所定時間内に前記充電電圧及び前記充電電流の測定を行った中で請求項７に記載の満充電の判定条件が満たされた回数、割合若しくは時間が所定の値以上であった場合、又は所定時間若しくは所定回数連続して請求項７に記載の満充電の判定条件が満たされた場合、前記蓄電池が満充電であると判定することを特徴とする請求項７に記載の蓄電池の満充電判定方法である。
【００１９】
請求項９に記載の発明は、所定回数の若しくは所定時間内に蓄電池の充電電圧及び充電電流の測定を行った中で、前記充電電圧が所定の範囲内の値であり且つ前記充電電流が所定値以下である電圧電流条件を満たす回数、割合若しくは時間が所定の値以上であり、前記電圧電流条件を満たす場合における前記充電電流の時間微分の平均値若しくは前記充電電流の前回と今回との差分値の平均値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定方法である。
【００２０】
請求項１０に記載の発明は、前回の判定から所定時間以上の時間が経過し、且つ新たな充電開始時に前記判定を行うことを特徴とする請求項７から請求項９のいずれかの請求項に記載の蓄電池の満充電判定方法である。
【００２１】
請求項１１に記載の発明は、前記蓄電池が自動車用鉛蓄電池であり、前記自動車用鉛蓄電池が自動車に搭載されていることを特徴とする請求項７から請求項１０のいずれかの請求項に記載の蓄電池の満充電判定方法である。
【００２２】
請求項１２に記載の発明は、請求項７から請求項１１のいずれかの請求項に記載の満充電判定方法を実行する満充電判定ステップと、前記満充電判定ステップで満充電であると判定した時、前記蓄電池の残存容量を１００％に設定する残存容量推定ステップと、を有することを特徴とする蓄電池の残存容量推定方法である。
【００２３】
本発明は、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システム（例えば車載用電源システム）において、蓄電池の満充電判定を高精度に行う満充電判定装置及び満充電判定方法を実現できるという作用を有する。
【００２４】
本発明は、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システム（例えば車載用電源システム）において、蓄電池の満充電判定を高精度に行い、残存容量を高い精度で推定する残存容量推定装置及び残存容量推定方法を実現できるという作用を有する。
【００２５】
【発明の実施の形態】
以下本発明の実施をするための最良の形態を具体的に示した実施例について、図面とともに記載する。
【００２６】
《実施例１》
図１〜図４を用いて、本発明の実施例１の蓄電池の残存容量推定装置（満充電判定部を含む。）を説明する。実施例１の残存容量推定装置は車載用電源システムに組み込まれており、蓄電池は自動車用鉛蓄電池である。
【００２７】
図２は、本発明の実施例の電源システムの構成を示すブロック図である。図２において、２０１は発電機、２０２は負荷、２０３は鉛蓄電池、２０４は電流センサ、２０５は電流計測部、２０６は電圧計測部、２１０は発電機制御部、２１１はエンジン、２１２は残存容量推定装置である。残存容量推定装置２１２は、満充電判定部２０７、残存容量推定部２０８及び表示部２０９を有する。
【００２８】
発電機２０１は自動車のエンジン２１１によって駆動されて発電を行う。発電された電力は負荷２０２及び鉛蓄電池２０３に供給される。負荷２０２は、具体的にはエンジン始動用のセルモータ、オーディオ装置、エアコン、ランプ等である。鉛蓄電池２０３は走行中はほとんど常に定電圧充電されている。発電機２０１の出力が不足するエンジン始動時及び発電機２０１が停止するアイドルストップ中は、鉛蓄電池２０３が負荷２０２に電力を供給する。
【００２９】
電流センサ２０４は鉛蓄電池２０３に流れる電流を検出し、電流計測部２０５に出力する。電圧計測部２０６及び電流計測部２０５は０．２秒毎に電圧及び電流をそれぞれ計測し、１秒分（５個）の測定値の平均値を鉛蓄電池２０３の電圧（Ｖ）及び電流（Ｉ）として、１秒毎に満充電判定部２０７に出力する。
【００３０】
満充電判定部２０７は、電圧計測部２０６の測定電圧及び電流計測部２０５の測定電流を入力し、鉛蓄電池２０３が満充電状態か否かを判定し、判定結果を残存容量推定部２０８に送る。残存容量推定部２０８は、満充電判定部２０７の判定結果、電圧計測部２０６の測定電圧及び電流計測部２０５の測定電流を入力し、鉛蓄電池２０３の残存容量（ＳＯＣ）を推定する。残存容量推定部２０８は、満充電判定部２０７から鉛蓄電池２０３が満充電であるという判定結果を入力した時、鉛蓄電池２０３の残存容量を１００％に設定する。その後残存容量推定部２０８は、鉛蓄電池２０３の充放電電圧及び充放電電流に基づいて、鉛蓄電池２０３の充放電電力量を積算し、その残存容量を推定する。
【００３１】
残存容量推定部２０８は、推定した残存容量の情報を表示部２０９と発電機制御部２１０とに送る。表示部２０９は、残存容量推定部２０８から送られた残存容量の情報に基づき、ユーザに残存容量を表示する。表示方法は任意である。実施例においては、表示部２０９は、残存容量が少ない場合に黄色のランプを点灯させ、残存容量が所定の値以下の場合（鉛蓄電池２０３がエンジンを始動させることが出来ない程その残存容量が少ない場合）に赤色のランプを点灯させる。
【００３２】
発電機制御部２１０は、残存容量推定部２０８から伝送された残存容量の情報に基づき、残存容量が１００％に達した時、発電機のステータに流す電流を下げ、発電機２０１の発電電圧を下げる。これにより、鉛蓄電池２０３の過充電を防止する。発電機制御部２１０は、残存容量が所定の値以下になった場合は、発電機のステータに流す電流を上げ、発電機２０１の発電電圧を上げる。これにより、鉛蓄電池２０３の充電を促進する。
【００３３】
発電機２０１及び鉛蓄電池２０３から負荷２０２への電流は、エンジン始動時には数秒の間２００アンペア程度に達し（主としてセルモータの駆動電流である。）、エンジンが始動した後は、数１０アンペア以下で変動する。エンジンが始動した後も、動作条件に応じて負荷２０２は変動する（例えばランプがＯＮかＯＦＦか等）。発電機２０１の出力電圧及び出力電流は、エンジンの回転数等に応じて短時間で大きく変化する。従って、鉛蓄電池２０３の充電電流（又は放電電流）（Ｉ）及び充電電圧（又は放電電圧）（Ｖ）は、発電機２０１の出力変動及び負荷２０２の変動の影響を受けて、時間的に大きく変動する。
【００３４】
図３は、蓄電池の充電電圧及び充放電電流の時間変化を示す図である。電流は充電時に正の値になるように定義している。エンジン始動時と、アイドルストップ後のエンジン再始動時には１秒程度に渡って鉛蓄電池２０３が電力を放電し（電流が負の値になり）、電流計測部２０５の測定電流と電圧計測部２０６の測定電圧とはスパイク的に低下する。その他の走行時は、鉛蓄電池２０３はほぼ定電圧充電される。鉛蓄電池２０３が満充電に近づくにつれて、充電電流は漸減する。
【００３５】
図１は本発明の実施例１の電源システムにおける蓄電池の満充電判定方法を示すフローチャートである。満充電判定部２０７は、６０秒分（６０個）の電流（Ｉ）及び電圧（Ｖ）の測定値に基づいて、鉛蓄電池２０３の満充電判定を行う。
【００３６】
ステップ１０１で、電流と電圧の測定回数Ｎと満充電判定のための指数ｎに初期値０を代入する。電流と電圧の測定時間間隔Δｔを１秒に設定する。ステップ１０２でＮに１を加算する。ステップ１０３で、Ｎが６０より大きいか否か、つまり満充電判定のための測定時間が６０秒間を上回ったかどうか判断する。Ｎが６０より大きい場合はステップ１０９に進む。Ｎが６０以下の場合は、ステップ１０４に進む。
【００３７】
電圧計測部２０６は電圧Ｖを、電流計測部２０５は電流Ｉを満充電判定部２０７に出力する（ステップ１０４）。ステップ１０５で電圧Ｖが１３．７ボルト以上かつ１４．３ボルト以下か否か判断する。該当しない場合はステップ１０２に戻る。該当する場合はステップ１０６に進む。ステップ１０６で、電流Ｉが２アンペア以下か否か判断する。該当しない場合はステップ１０２に戻る。該当する場合はステップ１０７に進む。ステップ１０７で、前回計測した電流と今回測定した電流の差ΔＩを測定時間間隔Δｔで除した値（充電電流の時間変化率又は微分値）が所定の閾値Ｃ以下か否か判断する。これに代えて、前回計測した電流と今回測定した電流の差ΔＩが所定の閾値Ｃ以下か否か判断しても良い。該当しない場合はステップ１０２に戻る。該当する場合はステップ１０８に進む。ステップ１０５、１０６及び１０７で行う判断に全て該当し、ステップ１０８まで進んだ場合、鉛蓄電池２０３が１秒間満充電状態であったと判断する。ｎに１を加算し、ステップ１０２に戻る。
【００３８】
電流と電圧を６０秒間計測し終わった場合、ステップ１０３からステップ１０９に進む。ステップ１０９でＮに対するｎの割合が０．８以上か否か判断する。つまり、６０秒間のうち８割以上が満充電状態であったか否か判断する。８割以上が満充電状態であった場合は、満充電判定部２０７は、鉛蓄電池２０３が満充電状態であると判定する（ステップ１１０）。８割未満が満充電状態であった場合は、満充電判定部２０７は、鉛蓄電池２０３が満充電状態でないと判定する（ステップ１１１）。ステップ１１２で満充電判定部２０７は、判定結果を残存容量推定部２０８に送る。処理を終了する。
【００３９】
残存容量推定部２０８は、満充電であるという判定結果を入力した場合は、鉛蓄電池２０３の残存容量を１００％に設定する。発電機制御部２１０は、残存容量推定部２０８からの残存容量の情報に基づいて、モータの磁界（ステータ電流）を制御する。鉛蓄電池２０３が満充電された場合、発電機２０１の発電電圧Ｖを下げ、鉛蓄電池２０３の過充電を防止する。鉛蓄電池２０３の残存容量が所定以下になると、発電機２０１の発電電圧Ｖを上げ、鉛蓄電池２０３の充電を促進する。鉛蓄電池２０３の残存容量がエンジンを始動できる限度以下であれば、発電機制御部２１０はエンジンのアイドルストップを許可しない。
【００４０】
図４は、ｎ／Ｎの満充電判定閾値と、その閾値で満充電を判定した時の鉛蓄電池の実際のＳＯＣとの関係を示す図である。図１のフローチャートにおいて、ｎ／Ｎの閾値を様々に変化させて満充電判定を行い（ステップ１０９）、満充電であると判定した時の鉛蓄電池の実際のＳＯＣを測定した（満充電と判定された鉛蓄電池から実際に取り出せる電力量を測定した。）。ｘ印が測定結果を示す。ｎ／Ｎが０．８以上では、ＳＯＣが９８％を越え、精度良く満充電判定できることがわかる。
【００４１】
充電効率は温度によって異なるので、ステップ１０６で使用する、電流の閾値に温度補正を施せば、満充電判定の精度が上がる。充電電圧が高い場合は、充電に要する時間が短縮されるので、ステップ１０３で使用するＮの閾値を小さくしてよい。満充電判定を行うためのその他の閾値及び電流と電圧の測定時間間隔は鉛蓄電池２０３及び走行条件によって変更する必要がある。
【００４２】
従来例２に開示されている二次電池の充電方法は、充電電流が設定値以下になったときに満充電判定を行う方法である。従って、図３のように鉛蓄電池２０３の電流が時間変化する場合、エンジン再始動時にも、満充電判定をしてしまう可能性があった。従来例１及び従来例３に開示されている方法は、充電電流の時間変化率が小さくなったときに満充電判定を行う。図３のようにエンジンの再始動が繰り返される場合には、電流の大きな変化が繰り返されるため、満充電判定部がいつまでも満充電と判定せず、蓄電池が過充電される恐れがあった。又、蓄電池の残存容量を誤って推定する恐れがあった。
【００４３】
満充電判定部２０７は、電流、電流の時間変化率及び電圧がすべて満充電判定のための条件を満たす回数が一定割合以上ある時に、鉛蓄電池２０３が満充電であると判断する。本発明によれば、図３のように電流と電圧とが激しく変動する場合にも、正確な満充電判定が可能である。
【００４４】
《実施例２》
図２及び図５を用いて、本発明の実施例２の蓄電池の残存容量推定装置（満充電判定部を含む。）を説明する。実施例２の残存容量推定装置は車載用電源システムに組み込まれており、蓄電池は自動車用鉛蓄電池である。実施例２の蓄電池の残存容量推定装置は、実施例１と同一のハードウエアを有する（図２）。図２については、実施例１において説明した。実施例２の蓄電池の残存容量推定装置は、満充電の判定方法のみが実施例１と異なる。それ以外の点において、実施例２は実施例１と同じである。以下、図５を用いて、実施例２の満充電判定方法を説明する。
【００４５】
図５は本発明の実施例２の電源システムにおける蓄電池の満充電判定方法を示すフローチャートである。満充電判定部２０７は、６０秒分（６０個）の電流（Ｉ）及び電圧（Ｖ）の測定値に基づいて、鉛蓄電池２０３の満充電判定を行う。
【００４６】
ステップ５０１で、電流と電圧の測定回数Ｎと満充電判定のための指数ｎに初期値０を代入する。電流と電圧の測定時間間隔Δｔを１秒に設定する。ΣΔＩに初期値０を代入する。ΣΔＩは、２回の電流の測定値の差ΔＩの総和である。ステップ５０２でＮに１を加算する。ステップ５０３で、Ｎが６０より大きいか否か、つまり満充電判定のための測定時間が６０秒間を上回ったかどうか判断する。Ｎが６０より大きい場合はステップ５０９に進む。Ｎが６０以下の場合は、ステップ５０４に進む。
【００４７】
電圧計測部２０６は電圧Ｖを、電流計測部２０５は電流Ｉを満充電判定部２０７に出力する（ステップ５０４）。ステップ５０５で電圧Ｖが１３．７ボルト以上かつ１４．３ボルト以下か否か判断する。該当しない場合はステップ５０２に戻る。該当する場合はステップ５０６に進む。ステップ５０６で、電流Ｉが２アンペア以下か否か判断する。該当しない場合はステップ５０２に戻る。該当する場合はステップ５０７に進む。ステップ５０７で、ｎに１を加算する。次に、前回計測した電流と今回測定した電流の差ΔＩを積算する（ステップ５０８）。ΣΔＩは積算結果を示す。これに代えて、前回計測した電流と今回測定した電流の差ΔＩを測定時間間隔Δｔで除した値（充電電流の時間変化率又は微分値）を積算しても良い。ステップ５０２に戻る。
【００４８】
電流と電圧を６０秒間計測し終わった場合、ステップ５０３からステップ５０９に進む。ステップ５０９でＮに対するｎの割合が０．８以上か否か判断する。つまり、６０秒間のうち８割以上が満充電状態であったか否か判断する。Ｎに対するｎの割合が０．８以上であった場合は、ステップ５１０に進む。ステップ５１０で、ΣΔＩをｎで割り、１３．７≦Ｖ≦１４．３（ステップ５０５）及びＩ≦２（ステップ５０６）の条件を満たす場合における、前回計測した電流と今回測定した電流の差ΔＩの平均値を算出する。ΣΔＩ／ｎが所定の閾値Ｃ以下か否かを判断する。ΣΔＩ／ｎが所定の閾値Ｃ以下であれば、満充電判定部２０７は、鉛蓄電池２０３が満充電であると判断する（ステップ５１１）。満充電判定部２０７は、判定結果を出力する（ステップ５１３）。処理を終了する。
【００４９】
ステップ５０９において、Ｎに対するｎの割合が０．８未満であった場合は、ステップ５１２に進む。ステップ５１０において、ΣΔＩ／ｎが所定の閾値Ｃより大きければ、ステップ５１２に進む。ステップ５１２において、満充電判定部２０７は、鉛蓄電池２０３が満充電状態でないと判断する。満充電判定部２０７は、判定結果を出力する（ステップ５１３）。処理を終了する。
【００５０】
残存容量推定部２０８は、満充電であるという判定結果を入力した場合は、鉛蓄電池２０３の残存容量を１００％に設定する。発電機制御部２１０は、残存容量推定部２０８からの残存容量の情報に基づいて、モータの磁界（ステータ電流）を制御する。鉛蓄電池２０３が満充電された場合、発電機２０１の発電電圧Ｖを下げ、鉛蓄電池２０３の過充電を防止する。鉛蓄電池２０３の残存容量が所定以下になると、発電機２０１の発電電圧Ｖを上げ、鉛蓄電池２０３の充電を促進する。鉛蓄電池２０３の残存容量がエンジンを始動できる限度以下であれば、発電機制御部２１０はエンジンのアイドルストップを許可しない。
【００５１】
実施例１及び２において、所定回数（Ｎ回）の充電電圧及び充電電流の測定を行った中で、所定の満充電の判定条件が満たされた割合が所定の値（０．８）以上であった場合、蓄電池が満充電であると判定した。所定回数（Ｎ回）の充電電圧及び充電電流の測定に代えて、所定時間内で充電電圧及び充電電流の測定を行い、その測定結果に基づいて満充電判定を行っても良い。所定の満充電の判定条件が満たされた割合を閾値とすることに代えて、所定の満充電の判定条件が満たされた回数若しくは時間を閾値としても良い。
【００５２】
《実施例３》
図２及び図６を用いて、本発明の実施例３の蓄電池の残存容量推定装置（満充電判定部を含む。）を説明する。実施例３の残存容量推定装置は車載用電源システムに組み込まれており、蓄電池は自動車用鉛蓄電池である。実施例２の蓄電池の残存容量推定装置は、実施例１と同一のハードウエアを有する（図２）。図２については、実施例１において説明した。実施例３の蓄電池の残存容量推定装置は、満充電の判定方法のみが実施例１と異なる。それ以外の点において、実施例３は実施例１と同じである。以下、図６を用いて、実施例３の満充電判定方法を説明する。
【００５３】
図６は本発明の実施例３の電源システムにおける蓄電池の満充電判定方法を示すフローチャートである。満充電判定部２０７は、満充電状態が連続して一定時間（又は回数＝Ｄ）継続した場合に、鉛蓄電池２０３が真に満充電であると判定する。
【００５４】
ステップ６０１で、電流と電圧の測定回数Ｎと満充電判定のための指数ｍ及びｎに初期値０を代入する。電流と電圧の測定時間間隔Δｔを１秒に設定する。ステップ６０２で電圧計測部２０６は電圧Ｖを、電流計測部２０５は電流Ｉを満充電判定部２０７に出力する
【００５５】
ステップ６０３で電圧Ｖが１３．７ボルト以上かつ１４．３ボルト以下か否か判断する。該当しない場合はステップ６１１に進む。該当する場合はステップ６０４に進む。ステップ６０４で、電流Ｉが２アンペア以下か否か判断する。該当しない場合はステップ６１１に進む。該当する場合はステップ６０５に進む。ステップ６０５で、前回計測した電流と今回測定した電流の差ΔＩを測定時間間隔Δｔで除した値（充電電流の時間変化率又は微分値）が所定の閾値Ｃ以下か否か判断する。これに代えて、前回計測した電流と今回測定した電流の差ΔＩが所定の閾値Ｃ以下か否か判断しても良い。
【００５６】
ステップ６０５で、該当しない場合はステップ６１１に進む。該当する場合はステップ６０６に進む。ステップ６０３、６０４及び６０５で行う判断に全て該当し、ステップ６０６まで進んだ場合、鉛蓄電池２０３が１秒間満充電状態であったと判断する。ｎに１を加算し（ステップ６０６）、ｍを０に設定する（ステップ６０７）。ｎは鉛蓄電池２０３が満充電状態を継続した回数（時間）を意味し、ｍは鉛蓄電池２０３が満充電でない状態を継続した回数（時間）を意味する。
【００５７】
次にｎがＤ以上か否かを判断する（ステップ６０８）。Ｄは、鉛蓄電池２０３が満充電状態を継続した回数（時間）の閾値（例えばＤ＝１０）である。ｎがＤ以上であれば、満充電判定部２０７は、鉛蓄電池２０３が満充電状態であると判定する（ステップ６０９）。満充電判定部２０７は、ステップ６０３、６０４及び６０５で行う判断に全て該当する状態がＤ以上継続した場合に、鉛蓄電池２０３が満充電状態であると判定（ステップ６０９）、判定結果を出力する（ステップ６１０）。ステップ６０２に戻る。
【００５８】
ステップ６０３、６０４及び６０５で行う判断のいずれかに該当しないで、ステップ６１１まで進んだ場合、鉛蓄電池２０３が１秒間満充電でない状態であったと判断する。ｍに１を加算し（ステップ６１１）、ｎを０に設定する（ステップ６１２）。
【００５９】
次にｍがＤ以上か否かを判断する（ステップ６１３）。Ｄは、鉛蓄電池２０３が満充電でない状態を継続した回数（時間）の閾値（例えばＤ＝１０）である。ステップ６０８における閾値（満充電状態の継続回数の閾値）と、ステップ６１３における閾値（満充電でない状態の継続回数の閾値）とが異なる数値であっても良い。ｍがＤ以上であれば、満充電判定部２０７は、鉛蓄電池２０３が満充電状態でないと判定する（ステップ６１４）。満充電判定部２０７は、ステップ６０３、６０４及び６０５で行う判断において、いずれかに該当しない状態がＤ以上継続した場合に、鉛蓄電池２０３が満充電でない状態であると判定し（ステップ６１４）、判定結果を出力する（ステップ６１５）。ステップ６０２に戻る。
【００６０】
残存容量推定部２０８は、満充電であるという判定結果を入力した場合は、鉛蓄電池２０３の残存容量を１００％に設定する。発電機制御部２１０は、残存容量推定部２０８からの残存容量の情報に基づいて、モータの磁界（ステータ電流）を制御する。鉛蓄電池２０３が満充電された場合、発電機２０１の発電電圧Ｖを下げ、鉛蓄電池２０３の過充電を防止する。鉛蓄電池２０３の残存容量が所定以下になると、発電機２０１の発電電圧Ｖを上げ、鉛蓄電池２０３の充電を促進する。鉛蓄電池２０３の残存容量がエンジンを始動できる限度以下であれば、発電機制御部２１０はエンジンのアイドルストップを許可しない。
【００６１】
正確にＳＯＣを推定するためには、長時間の走行中に一定時間毎に鉛蓄電池２０３を充電し満充電判定を行い、ＳＯＣを１００％に設定（リセット）すると良い。エンジン始動時も、始動前の停車時の暗電流などによりＳＯＣが低下しているので、鉛蓄電池２０３を充電し満充電判定を行い、ＳＯＣを１００％に設定（リセット）すると良い。満充電判定は、前回の判定から所定時間以上の時間が経過し、且つ新たな充電開始時に行うことが好ましい。
【００６２】
【発明の効果】
本発明によれば、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システム（例えば車載用電源システム）において、蓄電池の満充電判定を高精度に行う満充電判定装置及び満充電判定方法を実現できるという有利な効果が得られる。
【００６３】
本発明によれば、充電器（発電機）が負荷に電力を供給しながら蓄電池を充電し、充電器の出力電圧及び負荷が短時間で大きく変動する電源システム（例えば車載用電源システム）において、蓄電池の満充電判定を高精度に行い、残存容量を高い精度で推定する残存容量推定装置及び残存容量推定方法を実現できるという有利な効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施例１の電源システムにおける蓄電池の満充電判定方法を示すフローチャート
【図２】本発明の実施例の電源システムの構成を示すブロック図
【図３】蓄電池の充電電圧及び充放電電流の時間変化を示す図
【図４】ｎ／Ｎの満充電判定閾値と満充電判定時の実際のＳＯＣとの関係を示す図
【図５】本発明の実施例２の電源システムにおける蓄電池の満充電判定方法を示すフローチャート
【図６】本発明の実施例３の電源システムにおける蓄電池の満充電判定方法を示すフローチャート
【符号の説明】
２０１発電機
２０２負荷
２０３鉛蓄電池
２０４電流センサ
２０５電流計測部
２０６電圧計測部
２０７満充電判定部
２０８残存容量推定部
２０９表示部
２１０発電機制御部
２１１エンジン
２１２残存容量推定装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a storage battery full charge determination device, a remaining capacity estimation device, a full charge determination method, and a remaining capacity estimation method.
[0002]
[Prior art]
Generally, a vehicle storage battery supplies a maximum current when the engine is started, and is charged at a constant voltage by a generator driven by the engine while the engine is running. If the remaining capacity of the vehicle storage battery becomes too small, the engine cannot be restarted after stopping the engine. In recent years, due to the growing interest in air pollution and ecology, in order to suppress unnecessary exhaust gas emission and energy consumption, it is necessary to stop the engine of the vehicle without idling even during a short parking and stopping (idle stop). ) Is recommended. For this reason, automobile batteries often supply a large current to start the engine. The state of charge of the storage battery (hereinafter, referred to as "SOC", specifically, the remaining capacity of the storage battery) is always accurately grasped so that the engine cannot be restarted after the vehicle is idle-stopped. Need to be.
[0003]
The SOC of the storage battery can be estimated by adding or subtracting a value obtained by integrating the charge / discharge current after full charge to the SOC at full charge. However, if the charge / discharge current is continuously integrated for a long time, the current detection error is accumulated, and the estimation accuracy of the SOC deteriorates. Charging the storage battery at an appropriate timing, accurately detecting the full charge, and setting the SOC to 100% leads to an improvement in the SOC estimation accuracy.
[0004]
JP-A-6-189466 discloses a secondary battery system and a charging method of Conventional Example 1. In the charging method of the secondary battery of Conventional Example 1, the secondary battery is initially charged at a constant current, and after the charging voltage reaches a set value, the battery is charged at a constant voltage, and the time derivative of the charging current exceeds the set value. This is a method to determine that the battery is fully charged.
[0005]
Japanese Patent Application Laid-Open No. Hei 7-235332 discloses a method of charging a secondary battery of Conventional Example 2. The method of charging a secondary battery according to Conventional Example 2 is a method of charging a secondary battery at a constant voltage, interrupting the charging when the charging current becomes equal to or less than a set value, measuring the open voltage of the battery, and detecting a full charge. It is.
[0006]
Japanese Patent Application Laid-Open No. 2000-324702 discloses a battery discharge capacity detection method and device of the third conventional example, and a vehicle battery control device. In the method for detecting the discharge capacity of a battery according to the third conventional example, for a battery including a lead-acid battery (lead storage battery) that can serve as a driving power source for a load and can be charged at a constant voltage, the absolute value of the time change rate of the charging current during the constant voltage charging is determined. A full charge determination is made when the value falls below a predetermined value.
[0007]
[Patent Document 1]
JP-A-6-189466
[Patent Document 2]
JP-A-7-235332
[Patent Document 3]
JP 2000-324702 A
[0008]
[Problems to be solved by the invention]
The full charge determination methods disclosed in Conventional Examples 1 to 3 can accurately determine the full charge of the storage battery in a system in which the charging voltage and the load are relatively stable. However, in the in-vehicle storage battery and its full-charge determination device, the output voltage and load of the charger (generator) greatly fluctuate in a short time depending on the traveling state of the vehicle and the like. The method could not accurately determine the full charge of the storage battery. The full charge determination methods of Conventional Examples 1 to 3 determine the full charge of the storage battery based on the charge current of the storage battery or the time derivative of the charge current, but this is a determination condition in the vehicle-mounted storage battery and the full charge determination device thereof. This is because the charging current of the storage battery and the time differential value of the charging current greatly fluctuate in a short time due to causes other than the charging of the storage battery. For this reason, when the conventional full-charge determination method is applied to a system having a large variation in the charging voltage or load (for example, a vehicle-mounted storage battery and its full-charge determination device), it has been difficult to accurately determine the full charge.
[0009]
The present invention solves the above-mentioned conventional problems, and a power supply system in which a charger (generator) charges a storage battery while supplying power to a load, and the output voltage and the load of the charger greatly fluctuate in a short time. It is an object of the present invention to provide a full-charge determination device and a full-charge determination method for performing full-charge determination of a storage battery with high accuracy.
[0010]
According to the present invention, in a power supply system in which a charger (generator) supplies power to a load and charges a storage battery, and the output voltage and the load of the charger greatly fluctuate in a short time, the full charge determination of the storage battery is performed with high accuracy. It is an object of the present invention to provide a remaining capacity estimating apparatus and a remaining capacity estimating method for estimating the remaining capacity with high accuracy.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configurations.
According to the first aspect of the present invention, the charging voltage of the storage battery is a value within a predetermined range, the charging current of the storage battery is equal to or lower than a predetermined value, and the time differentiation of the charging current or the previous and current times of the charging current are performed. The battery is determined to be fully charged when the difference value between the battery and the battery is equal to or less than a predetermined value.
[0012]
The invention according to claim 2 is a method of measuring the charging voltage and the charging current within a predetermined number of times or within a predetermined time, the number of times that the full charge determination condition according to claim 1 is satisfied, the ratio, or The battery is determined to be fully charged when the time is equal to or greater than a predetermined value, or when the full charge determination condition according to claim 1 is satisfied for a predetermined time or continuously for a predetermined number of times. The full-charge judging device for a storage battery according to claim 1.
[0013]
According to a third aspect of the present invention, when the charging voltage and the charging current of the storage battery are measured a predetermined number of times or within a predetermined time, the charging voltage is a value within a predetermined range and the charging current is a predetermined value. The number of times, ratio, or time that satisfies the voltage-current condition that is equal to or less than the value is equal to or greater than a predetermined value, and the average value of the time derivative of the charging current or the difference between the previous and current times of the charging current when the voltage-current condition is satisfied. A storage battery full-charge judging device characterized by judging that the storage battery is fully charged when an average value is equal to or less than a predetermined value.
[0014]
According to a fourth aspect of the present invention, the measurement or the determination is performed when a predetermined time or more has elapsed from the previous determination and a new charge is started. A full-charge judging device for a storage battery according to the present invention.
[0015]
The invention according to claim 5 is characterized in that the storage battery is a lead storage battery for a vehicle, and the lead storage battery for a vehicle and a full charge determination device are mounted on a vehicle. A storage battery full charge determination device according to any one of the claims.
[0016]
According to a sixth aspect of the present invention, when the full charge determination device according to any one of the first to fifth aspects and the full charge determination device determines that the battery is fully charged, the remaining storage battery remains. And a remaining capacity estimating unit that sets the capacity to 100%.
[0017]
According to a seventh aspect of the present invention, the charging voltage of the storage battery is a value within a predetermined range, the charging current of the storage battery is equal to or less than a predetermined value, and the time differentiation of the charging current or the previous and current times of the charging current are performed. And determining that the storage battery is fully charged when a difference value between the storage battery and the storage battery is less than or equal to a predetermined value.
[0018]
The invention according to claim 8 is a method of measuring the charging voltage and the charging current within a predetermined number of times or within a predetermined time, the number of times that the full charge determination condition according to claim 7 is satisfied, the ratio, or It is determined that the storage battery is fully charged when the time is equal to or greater than a predetermined value, or when the full charge determination condition according to claim 7 is satisfied for a predetermined time or continuously for a predetermined number of times. The method according to claim 7, wherein the storage battery is fully charged.
[0019]
According to a ninth aspect of the present invention, when the charging voltage and the charging current of the storage battery are measured a predetermined number of times or within a predetermined time, the charging voltage is a value within a predetermined range and the charging current is a predetermined value. The number of times, ratio, or time that satisfies the voltage-current condition that is equal to or less than the value is equal to or greater than a predetermined value, and the average value of the time derivative of the charging current or the difference between the previous and current times of the charging current when the voltage-current condition is satisfied. When the average value is equal to or less than a predetermined value, it is determined that the storage battery is fully charged.
[0020]
According to a tenth aspect of the present invention, the determination is performed when a predetermined time or more has elapsed since the previous determination and when a new charge is started. Is a method for judging a full charge of a storage battery according to the above.
[0021]
The invention according to claim 11 is characterized in that the storage battery is a lead storage battery for a vehicle, and the lead storage battery for a vehicle is mounted on a vehicle. It is a full charge determination method of the storage battery described in the above.
[0022]
According to a twelfth aspect of the present invention, a full charge determination step for executing the full charge determination method according to any one of the seventh to eleventh aspects, and the full charge determination step determines that the battery is fully charged. A remaining capacity estimating step of setting the remaining capacity of the storage battery to 100%.
[0023]
The present invention relates to a power supply system (for example, a vehicle-mounted power supply system) in which a charger (generator) charges a storage battery while supplying power to a load, and the output voltage and the load of the charger greatly fluctuate in a short time. This has the effect of realizing a full-charge determination device and a full-charge determination method for performing full-charge determination with high accuracy.
[0024]
The present invention relates to a power supply system (for example, a vehicle-mounted power supply system) in which a charger (generator) charges a storage battery while supplying power to a load, and the output voltage and the load of the charger greatly fluctuate in a short time. This has an effect that a remaining capacity estimating apparatus and a remaining capacity estimating method for performing full charge determination with high accuracy and estimating the remaining capacity with high accuracy can be realized.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment specifically showing the best mode for carrying out the present invention will be described below with reference to the drawings.
[0026]
<< Example 1 >>
First Embodiment A storage battery remaining capacity estimation device (including a full charge determination unit) according to a first embodiment of the present invention will be described with reference to FIGS. The remaining capacity estimating apparatus according to the first embodiment is incorporated in a vehicle-mounted power supply system, and the storage battery is an automotive lead storage battery.
[0027]
FIG. 2 is a block diagram showing the configuration of the power supply system according to the embodiment of the present invention. 2, reference numeral 201 denotes a generator, 202 denotes a load, 203 denotes a lead storage battery, 204 denotes a current sensor, 205 denotes a current measuring unit, 206 denotes a voltage measuring unit, 210 denotes a generator control unit, 211 denotes an engine, and 212 denotes a remaining capacity. It is an estimation device. The remaining capacity estimation device 212 includes a full charge determination unit 207, a remaining capacity estimation unit 208, and a display unit 209.
[0028]
The generator 201 is driven by an engine 211 of an automobile to generate power. The generated power is supplied to the load 202 and the lead storage battery 203. The load 202 is specifically a starter for starting the engine, an audio device, an air conditioner, a lamp, or the like. The lead storage battery 203 is almost always charged at a constant voltage during traveling. The lead storage battery 203 supplies power to the load 202 at the time of engine start when the output of the generator 201 is insufficient and during idle stop when the generator 201 stops.
[0029]
The current sensor 204 detects a current flowing through the lead storage battery 203 and outputs the current to the current measuring unit 205. The voltage measuring unit 206 and the current measuring unit 205 measure the voltage and the current, respectively, every 0.2 seconds, and average the measured values for one second (five) for the voltage (V) and the current (I) of the lead storage battery 203. ) Is output to the full charge determination unit 207 every second.
[0030]
The full charge determination unit 207 receives the measurement voltage of the voltage measurement unit 206 and the measurement current of the current measurement unit 205, determines whether or not the lead storage battery 203 is fully charged, and sends the determination result to the remaining capacity estimation unit 208. . The remaining capacity estimation unit 208 receives the determination result of the full charge determination unit 207, the measured voltage of the voltage measurement unit 206, and the measured current of the current measurement unit 205, and estimates the remaining capacity (SOC) of the lead storage battery 203. The remaining capacity estimation unit 208 sets the remaining capacity of the lead storage battery 203 to 100% when the determination result that the lead storage battery 203 is fully charged is input from the full charge determination unit 207. Thereafter, based on the charge / discharge voltage and charge / discharge current of lead storage battery 203, remaining capacity estimation section 208 integrates the charge / discharge power of lead storage battery 203 and estimates the remaining capacity.
[0031]
The remaining capacity estimation unit 208 sends information on the estimated remaining capacity to the display unit 209 and the generator control unit 210. The display unit 209 displays the remaining capacity to the user based on the remaining capacity information transmitted from the remaining capacity estimation unit 208. The display method is arbitrary. In the embodiment, the display unit 209 turns on the yellow lamp when the remaining capacity is low, and when the remaining capacity is equal to or less than a predetermined value (the remaining capacity is so large that the lead-acid battery 203 cannot start the engine). If there is less), turn on the red lamp.
[0032]
Based on the remaining capacity information transmitted from the remaining capacity estimating section 208, the generator control section 210 reduces the current flowing through the stator of the generator when the remaining capacity reaches 100%, and reduces the generated voltage of the generator 201. Lower. Thus, overcharging of the lead storage battery 203 is prevented. When the remaining capacity becomes equal to or less than a predetermined value, the generator control unit 210 increases the current flowing through the stator of the generator and increases the generated voltage of the generator 201. Thereby, charging of the lead storage battery 203 is promoted.
[0033]
The current from the generator 201 and the lead-acid battery 203 to the load 202 reaches about 200 amps for several seconds at the time of engine start (mainly the drive current of the starter motor). I do. Even after the engine starts, the load 202 fluctuates according to the operating conditions (for example, whether the lamp is ON or OFF). The output voltage and output current of the generator 201 greatly change in a short time according to the engine speed and the like. Therefore, the charging current (or discharging current) (I) and the charging voltage (or discharging voltage) (V) of the lead storage battery 203 are temporally large due to the fluctuation of the output of the generator 201 and the fluctuation of the load 202. fluctuate.
[0034]
FIG. 3 is a diagram showing the change over time of the charging voltage and the charging / discharging current of the storage battery. The current is defined to have a positive value during charging. When the engine is started and when the engine is restarted after the idle stop, the lead storage battery 203 discharges power (current becomes a negative value) for about one second, and the current measured by the current measuring unit 205 and the current measured by the voltage measuring unit 206 are reduced. The measured voltage drops in a spike manner. During other travels, the lead storage battery 203 is substantially charged at a constant voltage. As the lead storage battery 203 approaches full charge, the charging current gradually decreases.
[0035]
FIG. 1 is a flowchart illustrating a method for determining whether a storage battery is fully charged in the power supply system according to the first embodiment of the present invention. The full charge determination unit 207 performs a full charge determination of the lead storage battery 203 based on the measured values of the current (I) and the voltage (V) for 60 seconds (60 pieces).
[0036]
In step 101, an initial value 0 is substituted for the number of times N of current and voltage measurement and an index n for full charge determination. The measurement time interval Δt between the current and the voltage is set to 1 second. In step 102, 1 is added to N. In step 103, it is determined whether or not N is greater than 60, that is, whether or not the measurement time for the full charge determination exceeds 60 seconds. If N is greater than 60, the process proceeds to step 109. When N is 60 or less, the process proceeds to step 104.
[0037]
The voltage measurement unit 206 outputs the voltage V, and the current measurement unit 205 outputs the current I to the full charge determination unit 207 (Step 104). At step 105, it is determined whether or not the voltage V is not less than 13.7 volts and not more than 14.3 volts. If not, the process returns to step 102. If so, go to step 106. In step 106, it is determined whether the current I is equal to or less than 2 amps. If not, the process returns to step 102. If so, the process proceeds to step 107. In step 107, it is determined whether or not a value obtained by dividing the difference ΔI between the current measured last time and the current measured this time by the measurement time interval Δt (time change rate or differential value of the charging current) is equal to or less than a predetermined threshold value C. Alternatively, it may be determined whether or not the difference ΔI between the previously measured current and the current measured current is equal to or smaller than a predetermined threshold C. If not, the process returns to step 102. If so, go to step 108. If all of the determinations made in steps 105, 106, and 107 apply and the process proceeds to step 108, it is determined that the lead storage battery 203 has been fully charged for one second. One is added to n, and the process returns to step 102.
[0038]
When the current and voltage have been measured for 60 seconds, the process proceeds from step 103 to step 109. In step 109, it is determined whether the ratio of n to N is 0.8 or more. That is, it is determined whether or not 80% or more of the 60 seconds has been fully charged. When 80% or more are in the fully charged state, the full charge determination unit 207 determines that the lead storage battery 203 is in the fully charged state (Step 110). If less than 80% is in the fully charged state, the full charge determination unit 207 determines that the lead storage battery 203 is not in the fully charged state (Step 111). At step 112, full charge determination section 207 sends the determination result to remaining capacity estimation section 208. The process ends.
[0039]
When inputting the determination result that the battery is fully charged, the remaining capacity estimating unit 208 sets the remaining capacity of the lead storage battery 203 to 100%. Generator control section 210 controls the magnetic field (stator current) of the motor based on the remaining capacity information from remaining capacity estimation section 208. When the lead storage battery 203 is fully charged, the power generation voltage V of the generator 201 is reduced to prevent the lead storage battery 203 from being overcharged. When the remaining capacity of the lead storage battery 203 becomes equal to or less than a predetermined value, the power generation voltage V of the generator 201 is increased, and charging of the lead storage battery 203 is promoted. If the remaining capacity of lead storage battery 203 is less than the limit at which the engine can be started, generator control unit 210 does not permit idle stop of the engine.
[0040]
FIG. 4 is a diagram showing a relationship between the full charge determination threshold of n / N and the actual SOC of the lead storage battery when the full charge is determined based on the threshold. In the flowchart of FIG. 1, a full charge determination is made by changing the threshold value of n / N variously (step 109), and the actual SOC of the lead storage battery when it is determined that the battery is fully charged was measured (determined as full charge). The amount of power that could actually be extracted from the lead-acid battery was measured.) An x mark shows the measurement result. When n / N is 0.8 or more, the SOC exceeds 98%, and it can be seen that the full charge can be accurately determined.
[0041]
Since the charging efficiency varies depending on the temperature, if the current threshold used in step 106 is subjected to temperature correction, the accuracy of the full charge determination is increased. When the charging voltage is high, the time required for charging is shortened, so the threshold value of N used in step 103 may be reduced. It is necessary to change other threshold values for performing the full charge determination and the measurement time intervals of the current and the voltage according to the lead storage battery 203 and the running conditions.
[0042]
The method of charging a secondary battery disclosed in Conventional Example 2 is a method of performing a full charge determination when a charging current becomes equal to or less than a set value. Therefore, when the current of the lead storage battery 203 changes with time as shown in FIG. 3, there is a possibility that a full charge determination may be made even when the engine is restarted. In the methods disclosed in Conventional Example 1 and Conventional Example 3, the full charge determination is performed when the time change rate of the charging current becomes small. When the restart of the engine is repeated as shown in FIG. 3, a large change in the current is repeated, so that the full charge determination unit does not always determine that the battery is fully charged, and the storage battery may be overcharged. Further, there is a possibility that the remaining capacity of the storage battery is erroneously estimated.
[0043]
The full charge determination unit 207 determines that the lead storage battery 203 is fully charged when the number of times that the current, the time rate of change of the current, and the voltage all satisfy the condition for full charge determination is equal to or greater than a certain percentage. According to the present invention, accurate full charge determination is possible even when the current and voltage fluctuate sharply as shown in FIG.
[0044]
<< Example 2 >>
Second Embodiment A storage battery remaining capacity estimation device (including a full charge determination unit) according to a second embodiment of the present invention will be described with reference to FIGS. 2 and 5. The remaining capacity estimating device of the second embodiment is incorporated in a vehicle-mounted power supply system, and the storage battery is a lead storage battery for a vehicle. The storage battery remaining capacity estimating device of the second embodiment has the same hardware as that of the first embodiment (FIG. 2). FIG. 2 has been described in the first embodiment. The apparatus for estimating the state of charge of a storage battery according to the second embodiment is different from the first embodiment only in a method of determining a full charge. Otherwise, the second embodiment is the same as the first embodiment. Hereinafter, a full charge determination method according to the second embodiment will be described with reference to FIG.
[0045]
FIG. 5 is a flowchart illustrating a method for determining whether the storage battery is fully charged in the power supply system according to the second embodiment of the present invention. The full charge determination unit 207 performs a full charge determination of the lead storage battery 203 based on the measured values of the current (I) and the voltage (V) for 60 seconds (60 pieces).
[0046]
In step 501, an initial value 0 is substituted for the number of times N of current and voltage measurement and an index n for full charge determination. The measurement time interval Δt between the current and the voltage is set to 1 second. The initial value 0 is substituted for ΣΔI. ΣΔI is the sum of the differences ΔI between the two measured current values. In step 502, 1 is added to N. In step 503, it is determined whether or not N is greater than 60, that is, whether or not the measurement time for the full charge determination exceeds 60 seconds. If N is greater than 60, the process proceeds to step 509. When N is 60 or less, the process proceeds to step 504.
[0047]
The voltage measurement unit 206 outputs the voltage V, and the current measurement unit 205 outputs the current I to the full charge determination unit 207 (Step 504). At step 505, it is determined whether or not the voltage V is not less than 13.7 volts and not more than 14.3 volts. If not, the process returns to step 502. If so, go to step 506. At step 506, it is determined whether or not the current I is 2 amperes or less. If not, the process returns to step 502. If so, the process proceeds to step 507. At step 507, 1 is added to n. Next, the difference ΔI between the current measured last time and the current measured this time is integrated (step 508). ΣΔI indicates the integration result. Instead, a value obtained by dividing the difference ΔI between the previously measured current and the current measured current by the measurement time interval Δt (time change rate or differential value of the charging current) may be integrated. Return to step 502.
[0048]
When the current and voltage have been measured for 60 seconds, the process proceeds from step 503 to step 509. In step 509, it is determined whether the ratio of n to N is 0.8 or more. That is, it is determined whether or not 80% or more of the 60 seconds has been fully charged. If the ratio of n to N is 0.8 or more, the process proceeds to step 510. In step 510, ΣΔI is divided by n, and when the conditions of 13.7 ≦ V ≦ 14.3 (step 505) and I ≦ 2 (step 506) are satisfied, the difference ΔI between the current measured last time and the current measured this time. Is calculated. It is determined whether ΣΔI / n is equal to or less than a predetermined threshold value C. If ΣΔI / n is equal to or smaller than the predetermined threshold value C, the full charge determination unit 207 determines that the lead storage battery 203 is fully charged (step 511). Full charge determination section 207 outputs a determination result (step 513). The process ends.
[0049]
If the ratio of n to N is less than 0.8 in step 509, the process proceeds to step 512. In step 510, if ΣΔI / n is larger than the predetermined threshold C, the process proceeds to step 512. In step 512, the full charge determination unit 207 determines that the lead storage battery 203 is not in a fully charged state. Full charge determination section 207 outputs a determination result (step 513). The process ends.
[0050]
When inputting the determination result that the battery is fully charged, the remaining capacity estimating unit 208 sets the remaining capacity of the lead storage battery 203 to 100%. Generator control section 210 controls the magnetic field (stator current) of the motor based on the remaining capacity information from remaining capacity estimation section 208. When the lead storage battery 203 is fully charged, the power generation voltage V of the generator 201 is reduced to prevent the lead storage battery 203 from being overcharged. When the remaining capacity of the lead storage battery 203 becomes equal to or less than a predetermined value, the power generation voltage V of the generator 201 is increased, and charging of the lead storage battery 203 is promoted. If the remaining capacity of lead storage battery 203 is less than the limit at which the engine can be started, generator control unit 210 does not permit idle stop of the engine.
[0051]
In the first and second embodiments, when the charging voltage and the charging current are measured a predetermined number of times (N times), the rate at which the predetermined full charge determination condition is satisfied is equal to or greater than a predetermined value (0.8). When there was, it was determined that the storage battery was fully charged. Instead of measuring the charging voltage and the charging current a predetermined number of times (N times), the charging voltage and the charging current may be measured within a predetermined time, and a full charge determination may be made based on the measurement results. Instead of using the threshold at which the predetermined full charge determination condition is satisfied as the threshold, the threshold or the number of times or the time at which the predetermined full charge determination condition is satisfied may be used as the threshold.
[0052]
<< Example 3 >>
Third Embodiment A storage battery remaining capacity estimation device (including a full charge determination unit) according to a third embodiment of the present invention will be described with reference to FIGS. 2 and 6. The remaining capacity estimating apparatus according to the third embodiment is incorporated in a vehicle-mounted power supply system, and the storage battery is a lead storage battery for an automobile. The storage battery remaining capacity estimating device of the second embodiment has the same hardware as that of the first embodiment (FIG. 2). FIG. 2 has been described in the first embodiment. The apparatus for estimating the state of charge of a storage battery according to the third embodiment differs from the first embodiment only in a method of determining a full charge. Otherwise, the third embodiment is the same as the first embodiment. Hereinafter, a full charge determination method according to the third embodiment will be described with reference to FIG.
[0053]
FIG. 6 is a flowchart illustrating a method for determining whether the storage battery is fully charged in the power supply system according to the third embodiment of the present invention. The full charge determination unit 207 determines that the lead storage battery 203 is truly fully charged when the full charge state continues for a certain period of time (or the number of times = D).
[0054]
In step 601, an initial value 0 is substituted for the number of times N of current and voltage measurement and indices m and n for judging full charge. The measurement time interval Δt between the current and the voltage is set to 1 second. In step 602, the voltage measurement unit 206 outputs the voltage V and the current measurement unit 205 outputs the current I to the full charge determination unit 207.
[0055]
In step 603, it is determined whether the voltage V is equal to or higher than 13.7 volts and equal to or lower than 14.3 volts. If not, the process proceeds to step 611. If so, go to step 604. In step 604, it is determined whether the current I is equal to or less than 2 amps. If not, the process proceeds to step 611. If so, the process proceeds to step 605. In step 605, it is determined whether or not a value obtained by dividing the difference ΔI between the current measured at the previous time and the current measured at this time by the measurement time interval Δt (time change rate or differential value of the charging current) is equal to or less than a predetermined threshold value C. Alternatively, it may be determined whether or not the difference ΔI between the previously measured current and the current measured current is equal to or smaller than a predetermined threshold C.
[0056]
In step 605, if not applicable, the process proceeds to step 611. If so, go to step 606. If all the determinations made in steps 603, 604, and 605 are satisfied and the process proceeds to step 606, it is determined that the lead storage battery 203 is fully charged for one second. One is added to n (step 606), and m is set to 0 (step 607). n means the number of times (time) that the lead storage battery 203 has been fully charged, and m means the number of times (time) that the lead storage battery 203 has not been fully charged.
[0057]
Next, it is determined whether or not n is equal to or greater than D (step 608). D is a threshold value (for example, D = 10) of the number of times (time) that the lead storage battery 203 has been kept fully charged. If n is equal to or greater than D, the full charge determination unit 207 determines that the lead storage battery 203 is fully charged (step 609). The full charge determination unit 207 determines that the lead storage battery 203 is fully charged when all the states corresponding to the determinations performed in steps 603, 604, and 605 are D or more (step 609), and outputs a determination result. (Step 610). Return to step 602.
[0058]
If the process proceeds to step 611 without any of the determinations made in steps 603, 604, and 605, it is determined that the lead storage battery 203 has not been fully charged for one second. 1 is added to m (step 611), and n is set to 0 (step 612).
[0059]
Next, it is determined whether or not m is greater than or equal to D (step 613). D is a threshold (for example, D = 10) of the number of times (time) that the lead storage battery 203 has not been fully charged. The threshold in step 608 (the threshold for the number of continuations in the fully charged state) may be different from the threshold in step 613 (the threshold for the number of continuations in the state of not being fully charged). If m is greater than or equal to D, full charge determination section 207 determines that lead storage battery 203 is not in a fully charged state (step 614). The full charge determination unit 207 determines that the lead storage battery 203 is not fully charged when the state that does not correspond to any one of the determinations performed in steps 603, 604, and 605 continues for D or more (step 614). The judgment result is output (step 615). Return to step 602.
[0060]
When inputting the determination result that the battery is fully charged, the remaining capacity estimating unit 208 sets the remaining capacity of the lead storage battery 203 to 100%. Generator control section 210 controls the magnetic field (stator current) of the motor based on the remaining capacity information from remaining capacity estimation section 208. When the lead storage battery 203 is fully charged, the power generation voltage V of the generator 201 is reduced to prevent the lead storage battery 203 from being overcharged. When the remaining capacity of the lead storage battery 203 becomes equal to or less than a predetermined value, the power generation voltage V of the generator 201 is increased, and charging of the lead storage battery 203 is promoted. If the remaining capacity of lead storage battery 203 is less than the limit at which the engine can be started, generator control unit 210 does not permit idle stop of the engine.
[0061]
In order to accurately estimate the SOC, it is preferable to charge the lead-acid storage battery 203 at regular intervals during a long period of travel, make a full charge determination, and set (reset) the SOC to 100%. Even when the engine is started, the SOC is lowered due to the dark current at the time of stopping before starting, etc., so that it is preferable to charge the lead storage battery 203, make a full charge determination, and set (reset) the SOC to 100%. It is preferable that the full charge determination is performed at the start of a new charge after a lapse of a predetermined time or more from the previous determination.
[0062]
【The invention's effect】
According to the present invention, in a power supply system (for example, a vehicle-mounted power supply system) in which a charger (generator) charges a storage battery while supplying power to a load, and an output voltage and a load of the charger greatly vary in a short time, An advantageous effect of being able to realize a full-charge determination device and a full-charge determination method for determining the full charge of the storage battery with high accuracy is obtained.
[0063]
According to the present invention, in a power supply system (for example, a vehicle-mounted power supply system) in which a charger (generator) charges a storage battery while supplying power to a load, and an output voltage and a load of the charger greatly vary in a short time, An advantageous effect is obtained that a remaining capacity estimating apparatus and a remaining capacity estimating method for determining the full charge of the storage battery with high accuracy and estimating the remaining capacity with high accuracy can be realized.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a method for determining a full charge of a storage battery in a power supply system according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a power supply system according to an embodiment of the present invention.
FIG. 3 is a diagram showing a change over time of a charge voltage and a charge / discharge current of a storage battery.
FIG. 4 is a diagram showing a relationship between an n / N full charge determination threshold and an actual SOC at the time of full charge determination.
FIG. 5 is a flowchart illustrating a method for determining whether a storage battery is fully charged in the power supply system according to the second embodiment of the present invention.
FIG. 6 is a flowchart illustrating a method for determining a full charge of a storage battery in a power supply system according to a third embodiment of the present invention.
[Explanation of symbols]
201 generator
202 load
203 Lead storage battery
204 current sensor
205 Current measurement unit
206 Voltage measurement unit
207 Full charge judgment unit
208 Remaining capacity estimation unit
209 Display
210 Generator control unit
211 engine
212 Remaining capacity estimation device

Claims

蓄電池の充電電圧が所定の範囲内の値であり、前記蓄電池の充電電流が所定値以下であり、且つ前記充電電流の時間微分若しくは前記充電電流の前回と今回との差分値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定装置。The charging voltage of the storage battery is a value within a predetermined range, the charging current of the storage battery is equal to or less than a predetermined value, and the time derivative of the charging current or the difference between the previous and current times of the charging current is equal to or less than a predetermined value. In some cases, it is determined that the storage battery is fully charged.

所定回数の若しくは所定時間内に前記充電電圧及び前記充電電流の測定を行った中で請求項１に記載の満充電の判定条件が満たされた回数、割合若しくは時間が所定の値以上であった場合、又は所定時間若しくは所定回数連続して請求項１に記載の満充電の判定条件が満たされた場合、前記蓄電池が満充電であると判定することを特徴とする請求項１に記載の蓄電池の満充電判定装置。The number, rate, or time at which the determination condition of the full charge according to claim 1 is satisfied during the measurement of the charging voltage and the charging current within a predetermined number of times or within a predetermined time is equal to or more than a predetermined value. The storage battery according to claim 1, wherein the storage battery is determined to be fully charged in a case, or when a condition for determining full charge according to claim 1 is satisfied for a predetermined time or continuously for a predetermined number of times. Full charge judgment device.

所定回数の若しくは所定時間内に蓄電池の充電電圧及び充電電流の測定を行った中で、前記充電電圧が所定の範囲内の値であり且つ前記充電電流が所定値以下である電圧電流条件を満たす回数、割合若しくは時間が所定の値以上であり、前記電圧電流条件を満たす場合における前記充電電流の時間微分の平均値若しくは前記充電電流の前回と今回との差分値の平均値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定装置。During the measurement of the charging voltage and the charging current of the storage battery for a predetermined number of times or within a predetermined time, a voltage-current condition in which the charging voltage is within a predetermined range and the charging current is equal to or lower than a predetermined value is satisfied. When the number of times, the ratio or the time is equal to or more than a predetermined value, and the average value of the time derivative of the charging current or the average value of the difference value between the previous time and the current time of the charging current is less than or equal to the predetermined value when the voltage current condition is satisfied In some cases, it is determined that the storage battery is fully charged.

前回の判定から所定時間以上の時間が経過し、且つ新たな充電開始時に前記測定又は前記判定を行うことを特徴とする請求項１から請求項３のいずれかの請求項に記載の蓄電池の満充電判定装置。The battery according to any one of claims 1 to 3, wherein the measurement or the determination is performed when a predetermined time or more has elapsed from the previous determination and a new charge is started. Charge determination device.

前記蓄電池が自動車用鉛蓄電池であり、前記自動車用鉛蓄電池及び満充電判定装置が自動車に搭載されていることを特徴とする請求項１から請求項４のいずれかの請求項に記載の蓄電池の満充電判定装置。The storage battery according to any one of claims 1 to 4, wherein the storage battery is a lead storage battery for a vehicle, and the lead storage battery for a vehicle and a full charge determination device are mounted on a vehicle. Full charge judgment device.

請求項１から請求項５のいずれかの請求項に記載の満充電判定装置と、
前記満充電判定装置が満充電であると判定した時、前記蓄電池の残存容量を１００％に設定する残存容量推定部と、
を有することを特徴とする蓄電池の残存容量推定装置。A full charge determination device according to any one of claims 1 to 5,
A remaining capacity estimating unit that sets the remaining capacity of the storage battery to 100% when the full charge determination device determines that the battery is fully charged;
An apparatus for estimating the remaining capacity of a storage battery, comprising:

蓄電池の充電電圧が所定の範囲内の値であり、前記蓄電池の充電電流が所定値以下であり、且つ前記充電電流の時間微分若しくは前記充電電流の前回と今回との差分値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定方法。The charging voltage of the storage battery is a value within a predetermined range, the charging current of the storage battery is equal to or less than a predetermined value, and the time derivative of the charging current or the difference between the previous and current times of the charging current is equal to or less than a predetermined value. A method for determining whether the storage battery is fully charged, in which case the storage battery is determined to be fully charged.

所定回数の若しくは所定時間内に前記充電電圧及び前記充電電流の測定を行った中で請求項７に記載の満充電の判定条件が満たされた回数、割合若しくは時間が所定の値以上であった場合、又は所定時間若しくは所定回数連続して請求項７に記載の満充電の判定条件が満たされた場合、前記蓄電池が満充電であると判定することを特徴とする請求項７に記載の蓄電池の満充電判定方法。The number, rate, or time at which the full-charge determination condition according to claim 7 is satisfied during the measurement of the charging voltage and the charging current within a predetermined number of times or within a predetermined time. The storage battery according to claim 7, wherein the storage battery is determined to be fully charged in a case, or when a condition for determining full charge according to claim 7 is satisfied for a predetermined time or continuously for a predetermined number of times. Full charge judgment method.

所定回数の若しくは所定時間内に蓄電池の充電電圧及び充電電流の測定を行った中で、前記充電電圧が所定の範囲内の値であり且つ前記充電電流が所定値以下である電圧電流条件を満たす回数、割合若しくは時間が所定の値以上であり、前記電圧電流条件を満たす場合における前記充電電流の時間微分の平均値若しくは前記充電電流の前回と今回との差分値の平均値が所定値以下である場合に、前記蓄電池が満充電であると判定することを特徴とする蓄電池の満充電判定方法。During the measurement of the charging voltage and the charging current of the storage battery for a predetermined number of times or within a predetermined time, a voltage-current condition in which the charging voltage is within a predetermined range and the charging current is equal to or lower than a predetermined value is satisfied. When the number of times, the ratio or the time is equal to or more than a predetermined value, and the average value of the time derivative of the charging current or the average value of the difference value between the previous time and the current time of the charging current is less than or equal to the predetermined value when the voltage current condition is satisfied A method for determining whether the storage battery is fully charged, in which case the storage battery is determined to be fully charged.

前回の判定から所定時間以上の時間が経過し、且つ新たな充電開始時に前記判定を行うことを特徴とする請求項７から請求項９のいずれかの請求項に記載の蓄電池の満充電判定方法。The method according to any one of claims 7 to 9, wherein the determination is performed when a predetermined time or more has elapsed since the previous determination and when a new charge is started. .

前記蓄電池が自動車用鉛蓄電池であり、前記自動車用鉛蓄電池が自動車に搭載されていることを特徴とする請求項７から請求項１０のいずれかの請求項に記載の蓄電池の満充電判定方法。The method according to any one of claims 7 to 10, wherein the storage battery is a lead storage battery for a vehicle, and the lead storage battery for a vehicle is mounted on a vehicle.

請求項７から請求項１１のいずれかの請求項に記載の満充電判定方法を実行する満充電判定ステップと、
前記満充電判定ステップで満充電であると判定した時、前記蓄電池の残存容量を１００％に設定する残存容量推定ステップと、
を有することを特徴とする蓄電池の残存容量推定方法。A full charge determination step for performing the full charge determination method according to any one of claims 7 to 11,
When it is determined that the battery is fully charged in the full charge determination step, a remaining capacity estimation step of setting the remaining capacity of the storage battery to 100%;
A method for estimating a remaining capacity of a storage battery, comprising: