JP4180778B2 - Battery life estimation device for gas meter - Google Patents

Battery life estimation device for gas meter Download PDF

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Publication number
JP4180778B2
JP4180778B2 JP2000282238A JP2000282238A JP4180778B2 JP 4180778 B2 JP4180778 B2 JP 4180778B2 JP 2000282238 A JP2000282238 A JP 2000282238A JP 2000282238 A JP2000282238 A JP 2000282238A JP 4180778 B2 JP4180778 B2 JP 4180778B2
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Prior art keywords
battery
voltage
unit
gas meter
elapsed time
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JP2000282238A
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JP2002093465A (en
Inventor
一光 温井
守 鈴木
充典 小牧
健 田代
一生 今
浩人 宇山
郁雄 前田
仁朗 石野
剛 森永
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Toshiba Corp
Tokyo Gas Co Ltd
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Toshiba Corp
Tokyo Gas Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

【0001】
【発明の属する技術分野】
本発明は、ガスメータの電子部品に用いられる電池の寿命を推定するガスメータ用電池寿命推定装置に関する。
【0002】
【従来の技術】
現在既に実用化されているガスメータ(マイコンメータ)は、ガスの流量等を監視する。通常の使用状態と異なる大量のガスが流れたり、長時間に渡ってガスが連続して流れた場合や、地震などの異常が発生した場合には、マイコンが異常状態であると判断し、遮断弁に電流を流してガスの供給を停止し、事故を事前に防止するシステムとなっている。また、この制御は、電話回線等を通じて外部から遠隔操作ができるようになっている。
【0003】
このようなガスメータの電子回路には電池により電源が供給される。電池の電圧は、電圧検出器により定期的に検出され、検出電圧値が規定値以下になったときに、電池が寿命になったものとして遮断や警報等の処理が行われる。
【0004】
【発明が解決しようとする課題】
ところが、電池の電圧を検出する際に、疑似抵抗へ電流を印加することによって電圧を検出し、これを比較的短い周期で繰り返すので、このときの消費電流分だけ電池の寿命が短くなるという問題があった。
【0005】
また、検出電圧値が電池の寿命を示す規定値以下になったときに遮断や警報等の処理が行われるようになっていたため、寿命となったことは知ることができるが、寿命となる以前において電池の残存容量や残存する使用可能時間を知ることができず不便であった。
【0006】
本発明は、上記に鑑みてなされたものであり、その目的とするところは、電池の寿命に影響を与えることなく電池の残存容量や使用可能時間を推定することのできるガスメータ用電池寿命推定装置を提供することにある。
【0007】
【課題を解決するための手段】
上記目的を達成するため、本発明は、ガスメータに用いられる電池の寿命を推定するガスメータ用電池寿命推定装置であって、定常状態における平均消費電流量および異常が発生したときの1回当たりの消費電流量を記憶しておく記憶手段と、定常状態の経過時間を計測する計測手段と、異常の発生回数を計数する計数手段と、前記平均消費電流量と計測された経過時間との乗算値および前記1回当たりの消費電流量と計数された発生回数との乗算値を、前記電池の初期電流容量から減算することにより前記電池の残存容量を推定する推定手段と、を有することを特徴とする。
【0008】
本発明にあっては、前記平均消費電流量と計測された経過時間とを乗算することによって定常状態における消費電流量を算出するとともに、前記1回当たりの消費電流量と計数された発生回数とを乗算することによって異常状態における電池の消費電流量を算出し、これらを電池の初期電流容量から減算するようにしたことで、疑似抵抗を用いて電池の電圧を直接検出する必要がないので、電池の寿命に影響を与えることなく電池の残存容量を推定することができる。
【0009】
また、本発明は、上記のガスメータ用電池寿命推定装置において、前記電池の電圧を検出する検出手段を有することを特徴とする。
【0010】
本発明にあっては、電池の電圧を検出する検出手段を備えたことで、例えば短絡等の動作不良が発生して電池の残存容量を正確に推定できない場合に、補助的に電池の電圧を検出することができる。
【0011】
また、本発明は、ガスメータに用いられる電池の寿命を推定するガスメータ用電池寿命推定装置であって、経過時間に対する前記電池の電圧変化について記憶しておく記憶手段と、前記電池の電圧を検出する電圧検出手段と、前回の検出電圧値と今回の検出電圧値とを用いて傾きを算出する傾き算出手段と、算出された傾きと前記電圧変化とを対応させて経過時間を求める経過時間求出手段と、求めた経過時間を前記電池の寿命期間から減算して使用可能時間を推定する推定手段と、を有することを特徴とする。
【0012】
本発明にあっては、前回の検出電圧値と今回の検出電圧値とを用いて傾きを算出し、この傾きと経過時間に対する電池の電圧変化とを対応させて経過時間を求め、この経過時間を電池の寿命期間から減算して使用可能時間を推定するようにしたことで、電圧の検出回数を従来に比して大幅に低減することができ、電池の寿命を長くすることができる。
【0013】
また、グラフデータとして疑似抵抗を用いない開放電圧を検出したときのデータを記憶しておくようにすれば、電圧を検出する際に疑似抵抗を用いる必要がなくなるので、電池の寿命に影響を与えることなく電池の使用可能時間を推定することができる。
【0014】
また、本発明は、上記のガスメータ用電池寿命推定装置において、前記記憶手段は、温度を変えたときの複数のグラフデータを記憶したものであって、温度を検出する温度検出手段と、検出された温度に基づいて前記経過時間算出手段で用いられるグラフデータを選択する選択手段と、を有することを特徴とする。
【0015】
本発明にあっては、検出された温度に基づいて適切なグラフデータを選択するようにしたことで、温度変動に対応した正確な使用可能時間を推定することができる。
【0016】
【発明の実施の形態】
以下、本発明を適用した実施の形態について図面を用いて説明する。
【0017】
[第1の実施の形態]
図1は、一実施の形態に係るガスメータ及びこれに用いる電池寿命推定装置の構成を示す図である。同図のガスメータは、演算制御部2に計量部1と、駆動回路3と、地震検知部8と、圧力検知部9と、通信インタフェース(I/F)部10がそれぞれ接続され、駆動回路3には遮断部4と表示部11が接続された構成である。
【0018】
定常状態で動作し消費電力の比較的小さい計量部1、演算制御部2、地震検知部8、圧力検知部9、通信I/F部10には電池5により電源が供給される。異常が発生したときに遮断弁を閉じるために作動する駆動回路3と遮断部4は消費電力が比較的大きく電池12により電源が供給される。
【0019】
同図の電池寿命推定装置は、残存容量推定部6が演算制御部2に接続され、電圧検出部7が電池5と演算制御回路2に接続された構成である。
【0020】
計量部1は、ガスの流量を検出する流量センサを備え、ガスの流量を演算制御部2に知らせる。流量センサとしては、例えば半導体フローセンサが用いられる。
【0021】
地震検知部8は、地震を検知する感震器を備え、この感震器からの地震検知信号を演算制御部2に送出する。
【0022】
圧力検知部9は、ガスの圧力を検知する圧力センサを備え、ガス圧力信号を演算制御部2に送出する。
【0023】
演算制御部2は、図示していないCPU、ROM、RAM、タイマ、不揮発性メモリなどを有する構成であり、計量部1からのガス流量信号を所定サイクル毎に読み取り、このガス流量信号からガス使用状態の異常判定を行い、異常の際には警報・遮断信号を出力する。また、地震検知部8からの地震検知信号に基づいて地震発生の判定を行うとともに、圧力検知部9からのガス圧力信号に基づいてガス圧力の異常判定を行い、異常の際には警報・遮断信号を出力する。警報・遮断の発生履歴等については不揮発性メモリに記憶しておく。
【0024】
駆動回路3は、演算制御部2からの警報・遮断信号に応じて駆動信号を出力する。
【0025】
遮断部4は、駆動回路3からの駆動信号を受けてガス流路を遮断する。
【0026】
表示部11は、駆動回路3からの駆動信号を受けて警報・遮断モードとなったことをLCDに表示する。
【0027】
通信インタフェース(I/F)部10は、演算制御部2に記憶された警報・遮断の発生履歴等を外部に通信したり、外部設定器との通信を行うための入出力回路である。
【0028】
電池5としては、例えば、リチウム電池などが用いられ、その初期電流容量は6000[mAH]程度とする。同様に、電池12にもリチウム電池などが用いられるが、その初期電流容量は2000[mAH]程度である。電池12の容量の方が電池5よりも小さいのは、遮断部4や駆動回路3で消費される電流量は演算制御部2等で消費されるものよりも大きいのであるが、遮断部4等は年間を通じてほとんど作動することがないことによるものである。
【0029】
残存容量推定部6は、独自の演算部、記憶部、タイマ、計数カウンタ等を有し、演算制御回路2の動作状態を把握することにより、各部で消費された電流量を算出して、電池5の残存容量を推定する。この推定処理の詳細については後述する。
【0030】
電圧検出部7は、電池5の電圧を検出する電圧検出器を備え、短絡等の動作不良が発生して残存容量推定部6で正確に推定値を算出することができないときに補助的に電池5の電圧を検出する。
【0031】
次に、残存容量推定部6における推定処理について図2及び図3を用いて説明する。図2(a)は演算制御部2で消費される電流の状態、同図(b)は遮断部4で消費される電流の状態を示す。
【0032】
定常状態においては、演算制御部2は周期的に動作するので、演算制御部2により制御される計量部1や圧力検知部9等の各部も周期的に動作する。しかし、ガスの流量が増加した場合等の異常状態においては、警報・遮断モードとなり普段使用していない駆動回路3や遮断部4が作動するため演算制御部2の消費電流量は増加する。
【0033】
残存容量推定部6の記憶部では、定常状態において電池5により動作する各部で消費される単位時間当たりの平均電流量を記憶しておく。また、異常が発生したときの1回当たりに電池5により動作する各部で消費される消費電流量(消費電流値とその駆動時間との乗算値)についても予め記憶しておく。
【0034】
図3は、残存容量推定部6での処理手順を示すフローチャートである。
【0035】
まず、Step1で、異常状態の発生回数をカウントする。このカウントは、演算制御部2に大電流が流れた時の回数をカウントしてもよいし、駆動回路3や遮断部4の作動回数をカウントしてもよい。
【0036】
Step2で、異常状態において電池5により動作する各部で消費した消費電流量を算出する。この算出は、カウントされた異常状態の発生回数と、予め記憶されていた1回当たりの消費電流量とを乗算することにより行う。
【0037】
Step3で、定常状態において電池5により動作する各部で消費した消費電流量を算出する。この算出は、演算制御部2の動作時間を計測し、この動作時間と予め記憶しておいた平均電流値とを乗算することにより行う。
【0038】
Step4で、電池5の残存容量を推定する。この推定は、電池5の初期電流容量からStep2で算出した異常状態における消費電流量とStep3で算出した正常状態における消費電流量を減算することにより行う。
【0039】
したがって、本実施の形態によれば、残存容量推定部6で、平均消費電流量と計測された動作時間とを乗算することによって定常状態における消費電流量を算出するとともに、異常が発生したときの1回当たりの消費電流量と計数された発生回数とを乗算することによって異常状態における消費電流量を算出し、これらを電池5の初期電流容量から減算するようにしたことで、疑似抵抗を用いて電池5の電圧を直接検出する必要がないので、電池5の寿命に影響を与えることなく電池5の残存容量を推定することができる。
【0040】
また、電圧検出部7を併用したことにより、短絡等の動作不良が発生して電池5の残存容量を正確に推定できない場合に、補助的に電池5の電圧を検出することができる。
【0041】
なお、駆動回路3や遮断部4に電源を供給する電池12についても残存容量を推定するようにしてもよい。この場合には、図4に示すように、残存容量推定部15を遮断部4および演算制御部に接続し、電圧検出部14を電池12および演算制御部2に接続する。
【0042】
残存容量推定部15は、駆動回路3と遮断部4とが作動したときの1回当たりの消費電流値量を記憶しておき、駆動回路3と遮断部4の作動回数をカウントする。そして、演算制御部2からの指示に従って電池12の初期電流容量から1回当たりの消費電流量と作動回数との乗算値を減算することにより、電池12の残存容量を推定するようにする。
【0043】
[第2の実施の形態]
図5は、一実施の形態に係るガスメータ及びこれに用いる電池寿命推定装置の構成を示す図である。同図の電池寿命推定装置は、図1の残存容量推定部6の代わりに使用可能時間推定部16を用い、この使用可能時間推定部16を電圧検出部17と演算制御部2に接続した構成となっている。電圧検出部17の基本的な構成は電圧検出部7と同様である。この使用可能時間推定部16は、図7のような経過時間に対する電池の電圧変化を示すグラフデータを記憶している。なお、その他、図1と同一物には同一の符号を付すこととし、ここでは説明を省略する。
【0044】
図6は、使用可能時間推定部16での処理手順を示すフローチャートである。
【0045】
Step11で、電圧検出部17により検出された電池5の電圧を用いて、前回の検出電圧値と今回の検出電圧値との差分を分子とし、前回の電圧検出から今回の電圧検出までの経過時間を分母として傾きを算出する。
【0046】
Step12で、この傾きとグラフデータとを対応させて経過時間を求める。
【0047】
Step13で、電池の寿命期間からこの経過時間を減算することにより、残存する使用可能時間を推定する。
【0048】
したがって、本実施の形態によれば、使用可能時間推定部16で、前回の検出電圧値と今回の検出電圧値との差分を用いて傾きを算出し、この傾きとグラフデータとを対応させて経過時間を求め、この経過時間を電池5の寿命期間から減算するようにしたことで、電圧の検出回数を従来に比して大幅に低減することができ、電池の寿命を長くすることができる。
【0049】
また、グラフデータとして疑似抵抗を用いない開放電圧を検出したときのデータを記憶しておくようにすれば、電圧を検出する際に疑似抵抗を用いる必要がなくなるので、電池5の寿命に影響を与えることなく電池の使用可能時間を推定することができる。
【0050】
なお、使用可能時間を推定する際に、温度補正を行うようにしてもよい。この場合は、温度を変えたときの複数のグラフデータを使用可能時間推定部16に記憶しておくとともに、温度センサを設け、この温度センサにより検出された温度に基づいて適切なグラフデータを選択するようにする。
【0051】
この構成により、温度変動に対応した正確な使用可能時間を推定することができる。
【0052】
もちろん、温度の他、電池の種類や、直列・並列の接続手法、電池の本数等を変えたときのグラフデータを保持し、これらを変更したときに適切に補正できるようにしてもよい。
【0053】
【発明の効果】
以上、説明したように、本発明のガスメータ用電池寿命推定装置によれば、定常状態および異常状態における電池の消費電流量をそれぞれ算出し、これらを電池の初期電流容量から減算するようにしたことで、疑似抵抗を用いて電池の電圧を直接検出する必要がないので、電池の寿命に影響を与えることなく電池の残存容量を推定することができる。
【0054】
また、本発明のガスメータ用電池寿命推定装置によれば、前回の検出電圧値と今回の検出電圧値とを用いて傾きを算出し、この傾きと経過時間に対する電池の電圧変化とを対応させて経過時間を求め、この経過時間を電池の寿命期間から減算して使用可能時間を推定するようにしたことで、電圧の検出回数を従来に比して大幅に低減することができ、電池の寿命への影響を低減することができる。
【図面の簡単な説明】
【図1】第1の実施の形態に係るガスメータ及びこれに用いる電池寿命推定装置の構成を示すブロック図である。
【図2】(a)は演算制御部2での消費される電流の状態、(b)は遮断部4での消費される電流の状態を示す図である。
【図3】残存容量推定値6における処理手順を示すフローチャートである。
【図4】電池寿命推定装置の他の構成例を示す図である。
【図5】第2の実施の形態に係るガスメータ及び電池寿命推定装置の構成を示すブロック図である。
【図6】残存容量推定値16における処理手順を示すフローチャートである。
【図7】経過時間に対する電池の電圧変化を示すグラフである。
【符号の説明】
1…計量部
2…演算制御部
3…駆動回路
4…遮断部
5,12…電池
6,15…残存容量推定部
7,14,17…電圧検出部
8…地震検知部
9…圧力検知部
10…通信I/F部
11…表示部
16…使用可能時間推定部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery life estimation device for a gas meter that estimates the life of a battery used in an electronic component of a gas meter.
[0002]
[Prior art]
Gas meters (microcomputer meters) that are already in practical use monitor the gas flow rate and the like. If a large amount of gas that is different from the normal operating state flows, gas flows continuously over a long period of time, or an abnormality such as an earthquake occurs, the microcomputer is judged to be in an abnormal state and shut off. The system stops the gas supply by passing an electric current through the valve, preventing accidents in advance. This control can be remotely operated from the outside through a telephone line or the like.
[0003]
Power is supplied to the electronic circuit of such a gas meter by a battery. The voltage of the battery is periodically detected by a voltage detector, and when the detected voltage value becomes equal to or less than a specified value, processing such as interruption or alarm is performed assuming that the battery has reached the end of its life.
[0004]
[Problems to be solved by the invention]
However, when detecting the voltage of the battery, the voltage is detected by applying a current to the pseudo-resistor, and this is repeated in a relatively short cycle, so that the battery life is shortened by the current consumption at this time. was there.
[0005]
In addition, when the detection voltage value falls below the specified value indicating the battery life, it is possible to know that it has reached the end of its life because it has been cut off and alarmed, etc. However, it was inconvenient because the remaining capacity of the battery and the remaining usable time could not be known.
[0006]
The present invention has been made in view of the above, and an object of the present invention is to provide a battery life estimation device for a gas meter that can estimate the remaining capacity and usable time of a battery without affecting the battery life. Is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a battery life estimation apparatus for a gas meter that estimates the life of a battery used in a gas meter, and is an average current consumption amount in a steady state and consumption per time when an abnormality occurs. A storage means for storing the current amount; a measuring means for measuring the elapsed time in the steady state; a counting means for counting the number of occurrences of abnormality; a multiplication value of the average current consumption amount and the measured elapsed time; And estimation means for estimating a remaining capacity of the battery by subtracting a product of the consumed current amount per time and the counted number of occurrences from the initial current capacity of the battery. .
[0008]
In the present invention, the current consumption amount in a steady state is calculated by multiplying the average current consumption amount and the measured elapsed time, and the current consumption amount per occurrence and the number of occurrences counted By calculating the current consumption amount of the battery in the abnormal state by multiplying by, and subtracting these from the initial current capacity of the battery, it is not necessary to directly detect the battery voltage using a pseudo-resistance, The remaining capacity of the battery can be estimated without affecting the life of the battery.
[0009]
Further, the present invention provides a gas meter for battery life estimating apparatus described above, characterized by having a detecting means for detecting a voltage of said battery.
[0010]
In the present invention, by providing a detection means for detecting the voltage of the battery, for example, when a malfunction such as a short circuit occurs and the remaining capacity of the battery cannot be accurately estimated, the voltage of the battery is supplementarily set. Can be detected.
[0011]
The present invention also relates to a battery life estimation device for a gas meter that estimates the life of a battery used in a gas meter, the storage means for storing the change in voltage of the battery with respect to elapsed time, and the voltage of the battery are detected. A voltage detection means, a slope calculation means for calculating a slope using the previous detection voltage value and the current detection voltage value, and an elapsed time calculation for obtaining an elapsed time by associating the calculated slope with the voltage change. Means for subtracting the obtained elapsed time from the lifetime of the battery and estimating the usable time.
[0012]
In the present invention, the slope is calculated using the previous detected voltage value and the current detected voltage value, and the elapsed time is obtained by associating the slope with the voltage change of the battery with respect to the elapsed time. Is subtracted from the lifetime of the battery to estimate the usable time, so that the number of times of voltage detection can be greatly reduced as compared with the conventional case, and the lifetime of the battery can be extended.
[0013]
In addition, if the data when the open circuit voltage not using the pseudo resistance is detected is stored as the graph data, it is not necessary to use the pseudo resistance when detecting the voltage, which affects the battery life. The battery usable time can be estimated without any problem.
[0014]
Further, the present invention provides a gas meter for battery life estimating apparatus described above, the storage means, there is stored a plurality of graph data when changing the temperature, a temperature detecting means for detecting a temperature is detected Selection means for selecting graph data used by the elapsed time calculation means based on the measured temperature.
[0015]
In the present invention, the appropriate usable time corresponding to the temperature fluctuation can be estimated by selecting appropriate graph data based on the detected temperature.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments to which the present invention is applied will be described below with reference to the drawings.
[0017]
[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a gas meter and a battery life estimation apparatus used therefor according to an embodiment. The gas meter shown in FIG. 1 has a measuring unit 1, a drive circuit 3, an earthquake detection unit 8, a pressure detection unit 9, and a communication interface (I / F) unit 10 connected to the calculation control unit 2. In the configuration, the blocking unit 4 and the display unit 11 are connected.
[0018]
Power is supplied from the battery 5 to the measuring unit 1, the calculation control unit 2, the earthquake detection unit 8, the pressure detection unit 9, and the communication I / F unit 10 that operate in a steady state and consume relatively little power. The drive circuit 3 and the shut-off unit 4 that operate to close the shut-off valve when an abnormality occurs consumes relatively large power and is supplied with power by the battery 12.
[0019]
The battery life estimation apparatus shown in the figure has a configuration in which a remaining capacity estimation unit 6 is connected to the calculation control unit 2 and a voltage detection unit 7 is connected to the battery 5 and the calculation control circuit 2.
[0020]
The metering unit 1 includes a flow rate sensor that detects the gas flow rate, and notifies the calculation control unit 2 of the gas flow rate. For example, a semiconductor flow sensor is used as the flow rate sensor.
[0021]
The earthquake detection unit 8 includes a seismic device that detects an earthquake, and sends an earthquake detection signal from the seismic device to the calculation control unit 2.
[0022]
The pressure detection unit 9 includes a pressure sensor that detects the gas pressure, and sends a gas pressure signal to the calculation control unit 2.
[0023]
The arithmetic control unit 2 includes a CPU, a ROM, a RAM, a timer, a non-volatile memory, etc. (not shown), reads the gas flow rate signal from the metering unit 1 every predetermined cycle, and uses the gas from the gas flow rate signal An abnormal condition is judged, and an alarm / shutoff signal is output in the event of an abnormality. In addition, the occurrence of an earthquake is determined based on the earthquake detection signal from the earthquake detection unit 8, and the gas pressure abnormality is determined based on the gas pressure signal from the pressure detection unit 9. Output a signal. The alarm / shutdown occurrence history is stored in a nonvolatile memory.
[0024]
The drive circuit 3 outputs a drive signal in response to an alarm / shutoff signal from the arithmetic control unit 2.
[0025]
The blocking unit 4 receives the drive signal from the drive circuit 3 and blocks the gas flow path.
[0026]
The display unit 11 displays on the LCD that the alarm / shutoff mode has been entered in response to the drive signal from the drive circuit 3.
[0027]
The communication interface (I / F) unit 10 is an input / output circuit for communicating the alarm / blocking occurrence history stored in the arithmetic control unit 2 to the outside or communicating with an external setting device.
[0028]
As the battery 5, for example, a lithium battery or the like is used, and its initial current capacity is about 6000 [mAH]. Similarly, a lithium battery or the like is used for the battery 12, but the initial current capacity is about 2000 [mAH]. The capacity of the battery 12 is smaller than that of the battery 5 because the amount of current consumed by the blocking unit 4 and the drive circuit 3 is larger than that consumed by the calculation control unit 2 and the like. Is due to the fact that it rarely operates throughout the year.
[0029]
The remaining capacity estimation unit 6 has an original calculation unit, a storage unit, a timer, a counter, and the like. By grasping the operation state of the calculation control circuit 2, the amount of current consumed in each unit is calculated, and the battery A remaining capacity of 5 is estimated. Details of this estimation process will be described later.
[0030]
The voltage detection unit 7 includes a voltage detector that detects the voltage of the battery 5, and assists the battery when an operation failure such as a short circuit occurs and the remaining capacity estimation unit 6 cannot accurately calculate the estimated value. 5 voltage is detected.
[0031]
Next, the estimation process in the remaining capacity estimation unit 6 will be described with reference to FIGS. FIG. 2A shows the state of current consumed by the arithmetic control unit 2, and FIG. 2B shows the state of current consumed by the blocking unit 4.
[0032]
In the steady state, since the calculation control unit 2 operates periodically, each unit such as the weighing unit 1 and the pressure detection unit 9 controlled by the calculation control unit 2 also operates periodically. However, in an abnormal state such as when the gas flow rate increases, the current consumption amount of the arithmetic control unit 2 increases because the drive circuit 3 and the cutoff unit 4 that are not normally used operate due to the alarm / shutdown mode.
[0033]
The storage unit of the remaining capacity estimation unit 6 stores an average current amount per unit time consumed by each unit operated by the battery 5 in a steady state. In addition, the current consumption amount (multiplied value of the current consumption value and its drive time) consumed in each unit operated by the battery 5 per time when an abnormality occurs is stored in advance.
[0034]
FIG. 3 is a flowchart showing a processing procedure in the remaining capacity estimation unit 6.
[0035]
First, at Step 1, the number of occurrences of abnormal conditions is counted. This count may be the number of times when a large current flows through the arithmetic control unit 2 or the number of actuations of the drive circuit 3 or the blocking unit 4 may be counted.
[0036]
In Step 2, the amount of current consumed by each unit operated by the battery 5 in the abnormal state is calculated. This calculation is performed by multiplying the counted number of occurrences of the abnormal state by the current consumption amount per time stored in advance.
[0037]
In Step 3, the amount of current consumed consumed by each part operated by the battery 5 in the steady state is calculated. This calculation is performed by measuring the operation time of the arithmetic control unit 2 and multiplying this operation time by an average current value stored in advance.
[0038]
In Step 4, the remaining capacity of the battery 5 is estimated. This estimation is performed by subtracting the consumed current amount in the abnormal state calculated in Step 2 from the initial current capacity of the battery 5 and the consumed current amount in the normal state calculated in Step 3.
[0039]
Therefore, according to the present embodiment, the remaining capacity estimation unit 6 calculates the consumption current amount in the steady state by multiplying the average consumption current amount by the measured operation time, and when the abnormality occurs. By multiplying the current consumption amount per time by the counted number of occurrences, the current consumption amount in the abnormal state is calculated, and these are subtracted from the initial current capacity of the battery 5 so that a pseudo resistance is used. Thus, since it is not necessary to directly detect the voltage of the battery 5, the remaining capacity of the battery 5 can be estimated without affecting the life of the battery 5.
[0040]
Further, by using the voltage detection unit 7 together, the voltage of the battery 5 can be detected supplementarily when an operation failure such as a short circuit occurs and the remaining capacity of the battery 5 cannot be accurately estimated.
[0041]
Note that the remaining capacity of the battery 12 that supplies power to the drive circuit 3 and the blocking unit 4 may be estimated. In this case, as shown in FIG. 4, the remaining capacity estimation unit 15 is connected to the blocking unit 4 and the calculation control unit, and the voltage detection unit 14 is connected to the battery 12 and the calculation control unit 2.
[0042]
The remaining capacity estimation unit 15 stores the amount of current consumption per operation when the drive circuit 3 and the cutoff unit 4 are activated, and counts the number of actuations of the drive circuit 3 and the cutoff unit 4. Then, the remaining capacity of the battery 12 is estimated by subtracting the product of the current consumption per operation and the number of operations from the initial current capacity of the battery 12 according to the instruction from the arithmetic control unit 2.
[0043]
[Second Embodiment]
FIG. 5 is a diagram illustrating a configuration of a gas meter and a battery life estimation apparatus used therefor according to an embodiment. The battery life estimation apparatus of the figure uses a usable time estimation unit 16 instead of the remaining capacity estimation unit 6 of FIG. 1, and this usable time estimation unit 16 is connected to the voltage detection unit 17 and the calculation control unit 2. It has become. The basic configuration of the voltage detection unit 17 is the same as that of the voltage detection unit 7. This usable time estimation unit 16 stores graph data indicating the voltage change of the battery with respect to the elapsed time as shown in FIG. In addition, suppose that the same thing as FIG. 1 is attached | subjected the same code | symbol, and abbreviate | omits description here.
[0044]
FIG. 6 is a flowchart showing a processing procedure in the usable time estimation unit 16.
[0045]
In Step 11, using the voltage of the battery 5 detected by the voltage detection unit 17, the difference between the previous detection voltage value and the current detection voltage value is used as a numerator, and the elapsed time from the previous voltage detection to the current voltage detection. Is used as the denominator.
[0046]
In Step 12, the elapsed time is obtained by associating the slope with the graph data.
[0047]
In Step 13, the remaining usable time is estimated by subtracting this elapsed time from the battery lifetime.
[0048]
Therefore, according to the present embodiment, the usable time estimation unit 16 calculates a slope using the difference between the previous detected voltage value and the current detected voltage value, and associates the slope with the graph data. By obtaining the elapsed time and subtracting this elapsed time from the lifetime of the battery 5, the number of times of voltage detection can be greatly reduced compared to the conventional case, and the lifetime of the battery can be extended. .
[0049]
Further, if the data when the open circuit voltage not using the pseudo resistance is detected is stored as the graph data, it is not necessary to use the pseudo resistance when detecting the voltage, so that the life of the battery 5 is affected. The usable time of the battery can be estimated without giving it.
[0050]
Note that temperature correction may be performed when the usable time is estimated. In this case, a plurality of graph data when the temperature is changed are stored in the usable time estimation unit 16, and a temperature sensor is provided, and appropriate graph data is selected based on the temperature detected by the temperature sensor. To do.
[0051]
With this configuration, it is possible to estimate an accurate usable time corresponding to a temperature variation.
[0052]
Of course, in addition to the temperature, graph data when the battery type, the series / parallel connection method, the number of batteries, and the like are changed may be held so that the data can be appropriately corrected when these are changed.
[0053]
【The invention's effect】
As described above, according to the battery life estimation apparatus for gas meter of the present invention, the consumption current amount of the battery in the steady state and the abnormal state is calculated respectively, and these are subtracted from the initial current capacity of the battery. Thus, since it is not necessary to directly detect the battery voltage using the pseudo resistance, the remaining capacity of the battery can be estimated without affecting the life of the battery.
[0054]
In addition, according to the battery life estimation apparatus for a gas meter of the present invention, the inclination is calculated using the previous detection voltage value and the current detection voltage value, and the inclination is associated with the change in the battery voltage with respect to the elapsed time. By calculating the elapsed time and subtracting this elapsed time from the battery life period to estimate the usable time, the number of times the voltage can be detected can be greatly reduced compared to the conventional method. The influence on can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a gas meter and a battery life estimation apparatus used therefor according to a first embodiment.
2A is a diagram illustrating a state of current consumed in the arithmetic control unit 2, and FIG. 2B is a diagram illustrating a state of current consumed in the interrupting unit 4. FIG.
FIG. 3 is a flowchart showing a processing procedure in a remaining capacity estimation value 6;
FIG. 4 is a diagram illustrating another configuration example of the battery life estimation apparatus.
FIG. 5 is a block diagram showing a configuration of a gas meter and a battery life estimation device according to a second embodiment.
FIG. 6 is a flowchart showing a processing procedure in the remaining capacity estimation value 16;
FIG. 7 is a graph showing changes in battery voltage with respect to elapsed time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Metering part 2 ... Calculation control part 3 ... Drive circuit 4 ... Blocking part 5, 12 ... Battery 6, 15 ... Remaining capacity estimation part 7, 14, 17 ... Voltage detection part 8 ... Earthquake detection part 9 ... Pressure detection part 10 ... Communication I / F unit 11 ... Display unit 16 ... Usable time estimation unit

Claims (2)

ガスメータに用いられる電池の寿命を推定するガスメータ用電池寿命推定装置であって、
経過時間に対する前記電池の電圧変化について記憶しておく記憶手段と、
前記電池の電圧を検出する電圧検出手段と、
前回の検出電圧値と今回の検出電圧値とを用いて傾きを算出する傾き算出手段と、
算出された傾きと前記電圧変化とを対応させて経過時間を求める経過時間求出手段と、
求めた経過時間を前記電池の寿命期間から減算して使用可能時間を推定する推定手段と、
を有することを特徴とするガスメータ用電池寿命推定装置。
A battery life estimation device for a gas meter for estimating the life of a battery used in a gas meter,
Storage means for storing a change in voltage of the battery with respect to elapsed time;
Voltage detecting means for detecting the voltage of the battery;
A slope calculating means for calculating a slope using the previous detected voltage value and the current detected voltage value;
An elapsed time obtaining means for obtaining an elapsed time by associating the calculated inclination with the voltage change;
Estimating means for subtracting the obtained elapsed time from the lifetime of the battery to estimate the usable time;
A battery life estimation device for a gas meter, comprising:
前記記憶手段は、温度を変えたときの複数のグラフデータを記憶したものであって、
温度を検出する温度検出手段と、
検出された温度に基づいて前記経過時間算出手段で用いられるグラフデータを選択する選択手段と、
を有することを特徴とする請求項記載のガスメータ用電池寿命推定装置。
The storage means stores a plurality of graph data when the temperature is changed,
Temperature detecting means for detecting the temperature;
Selection means for selecting graph data used by the elapsed time calculation means based on the detected temperature;
The battery life estimation device for a gas meter according to claim 1, wherein
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