FR2482731A1 - METHOD FOR MEASURING AND CONTINUOUSLY DISPLAYING THE CHARGING STATUS OF AN ELECTRICAL ACCUMULATOR - Google Patents
METHOD FOR MEASURING AND CONTINUOUSLY DISPLAYING THE CHARGING STATUS OF AN ELECTRICAL ACCUMULATOR Download PDFInfo
- Publication number
- FR2482731A1 FR2482731A1 FR8109725A FR8109725A FR2482731A1 FR 2482731 A1 FR2482731 A1 FR 2482731A1 FR 8109725 A FR8109725 A FR 8109725A FR 8109725 A FR8109725 A FR 8109725A FR 2482731 A1 FR2482731 A1 FR 2482731A1
- Authority
- FR
- France
- Prior art keywords
- voltage
- battery
- current
- appraisal
- evaluation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000010287 polarization Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
LA PRESENTE INVENTION A POUR OBJET UN PROCEDE DE MESURE ET D'AFFICHAGE CONTINUS DE L'ETAT DE CHARGEMENT D'UN ACCUMULATEUR ELECTRIQUE, DANS LEQUEL ON ADDITIONNE LA TENSION AUX BORNES DE LA BATTERIE D'ACCUMULATEUR (APPRECIATION DE LA TENSION) ET UNE TENSION DE MESURE PRISE SUR UNE RESISTANCE DE SHUNTAGE CHOISIE ARBITRAIREMENT ET BRANCHEE DANS LE CIRCUIT DE DECHARGEMENT (APPRECIATION DE L'INTENSITE), LES VALEURS AINSI MESUREES ETANT, LE CAS ECHEANT, AMPLIFIEES, APRES QUOI, ON COMPARE LA SOMME DES TENSIONS AINSI ETABLIE A UNE TENSION DE REFERENCE, TOUT EN AMPLIFIANT, LE CAS ECHEANT, LA TENSION DIFFERENTIELLE AINSI ETABLIE, ET L'ON APPLIQUE LADITE TENSION DIFFERENTIELLE A UN INSTRUMENT INDICATEUR COMMANDE EN FONCTION DE CETTE DERNIERE. CE PROCEDE EST CARACTERISE EN CE QUE CHAQUE PROCESSUS DE CHARGEMENT ET DE DECHARGEMENT DE L'ACCUMULATEUR EST DETECTE PAR UNE APPRECIATION DE LA DIRECTION DU COURANT QUI MODIFIE L'APPRECIATION DE L'INTENSITE ET L'APPRECIATION DE LA TENSION EN FONCTION DU CHARGEMENT OU DU DECHARGEMENT DE LA BATTERIE, ET EN CE QUE LA SOMME DES TENSIONS EST ETABLIE PAR ADDITION OU SOUSTRACTION DE LA TENSION DE MESURE, LE CAS ECHEANT AMPLIFIEE (APPRECIATION DE L'INTENSITE), PRISE SUR LADITE RESISTANCE DE SHUNTAGE, A (OU DE) LA TENSION AUX BORNES DE LA BATTERIE, LE CAS ECHEANT AMPLIFIEE (APPRECIATION DE LA TENSION). L'INVENTION S'APPLIQUE AUX DISPOSITIFS DE CHARGEMENT ET DE SURVEILLANCE DES ACCUMULATEURS ELECTRIQUES.THE SUBJECT OF THE PRESENT INVENTION IS A PROCESS FOR CONTINUOUS MEASUREMENT AND DISPLAY OF THE STATE OF CHARGE OF AN ELECTRIC ACCUMULATOR, IN WHICH THE VOLTAGE IS ADDED AT THE TERMINALS OF THE ACCUMULATOR BATTERY (APPRAISAL OF THE VOLTAGE) AND A VOLTAGE MEASUREMENT TAKEN ON A SHUNTAGE RESISTOR CHOSEN ARBITRARILY AND CONNECTED IN THE DISCHARGE CIRCUIT (APPRAISAL OF THE INTENSITY), THE VALUES THUS MEASURED BEING, IF APPLICABLE, AMPLIFIED, AFTER WHAT, THE SUM OF THE VOLTAGES IS COMPARED WITH A VOLTAGE SUM. REFERENCE VOLTAGE, WHILE AMPLIFYING, IF NECESSARY, THE DIFFERENTIAL VOLTAGE THUS ESTABLISHED, AND THE SAID DIFFERENTIAL VOLTAGE IS APPLIED TO AN INDICATOR INSTRUMENT COMMANDED AS A FUNCTION OF THE LATTER. THIS PROCESS IS CHARACTERIZED IN THAT EACH PROCESS OF CHARGING AND DISCHARGING THE ACCUMULATOR IS DETECTED BY AN APPRAISAL OF THE DIRECTION OF THE CURRENT WHICH MODIFIES THE APPRAISAL OF THE CURRENT AND THE APPRAISAL OF THE VOLTAGE ACCORDING TO THE CHARGING OR THE DISCHARGE OF THE BATTERY, AND IN THAT THE SUM OF THE VOLTAGES IS ESTABLISHED BY ADDITION OR SUBTRACTION OF THE MEASURING VOLTAGE, IF NECESSARY AMPLIFIED (ASSESSMENT OF THE CURRENT), TAKEN ON THE SAID SHUNTAGE RESISTOR, AT (OR FROM) THE VOLTAGE AT THE BATTERY TERMINALS, IF NECESSARY AMPLIFIED (APPRAISAL OF THE VOLTAGE). THE INVENTION APPLIES TO CHARGING AND MONITORING DEVICES FOR ELECTRIC ACCUMULATORS.
Description
PROCEDE DE MESURE ET D'AFFICHAGE CONTINUS DE L'ETAT DE CHARGEMENTMETHOD FOR CONTINUOUSLY MEASURING AND DISPLAYING THE LOADING STATE
D'UN ACCUMULATEUR ELECTRIQUE.OF AN ELECTRIC ACCUMULATOR.
La présente invention concerne un procédé de mesure et d'affichage continus de l'état de chargement d'un accumulateur électrique, dans lequel The present invention relates to a method for continuously measuring and displaying the state of charge of an electric accumulator, in which
on additionne la tension aux bornes de la batterie d'accumulateur (apprécia- the voltage is added to the terminals of the accumulator battery (appreciate
tion de la tension) et une tension de mesure prise sur une résistance de shuntage choisie arbitrairement et branchée dans le circuit de déchargement (appréciation de l'intensité), les valeurs ainsi mesurées étant, le cas échéant, amplifiées, après quoi, on compare la somme des tensions ainsi établie à une tension de référence, tout en amplifiant, le cas échéant, la voltage) and a measurement voltage taken on a shunt resistor arbitrarily selected and connected in the unloading circuit (intensity evaluation), the values thus measured being, if necessary, amplified, after which, one compares the sum of the voltages thus established to a reference voltage, while amplifying, where appropriate, the
tension différentielle ainsi établie, et l'on applique ladite tension dif- differential voltage thus established, and the said different voltage is applied.
férentielle à un instrument indicateur commandé en fonction de cette dernière. to an indicator instrument controlled according to the latter.
Un procédé de ce genre est décrit dans la demande de brevet déposée A method of this type is described in the patent application filed
en République Fédérale d'Allemagne sous le No. P 28 56 948.4. in the Federal Republic of Germany under No. P 28 56 948.4.
Ce procédé connu est avantageux en ce qu'il permet un affichage con- This known method is advantageous in that it allows a display
tinu et très précis de l'état de chargement de la batterie, pendant le dé- tinu and very accurate the state of charge of the battery, during the de-
chargement de celle-ci. Ce.procédé permet également de tenir compte des étapes de chargement. Toutefois, le nouvel état de chargement de la batterie, qui résulte de chacune de ces étapes, n'est indiqué correctement que pendant loading it. This method also allows for loading steps. However, the new state of charge of the battery, which results from each of these steps, is correctly indicated only during
l'étape consécutive de déchargement. Ceci constitue un inconvénient, notam- the subsequent step of unloading. This is a disadvantage, particularly
ment dans le cas d'étapes de chargement relativement prolongées. in the case of relatively long loading steps.
La présente invention a pour but de créer un procédé qui élimine les inconvénients du procédé connu décrit ci-dessus, de façon telle qu'il soit possible d'afficher de manière précise l'état de chargement de la batterie, The object of the present invention is to create a method which eliminates the disadvantages of the known method described above, so that it is possible to accurately display the state of charge of the battery,
même pendant l'étape de chargement de celle-ci. even during the loading step thereof.
Le procédé faisant l'objet de l'invention, qui permet d'atteindre ce but, est remarquable notamment en ce que chaque processus de chargement et de The method which is the subject of the invention, which makes it possible to achieve this goal, is remarkable in that each process of loading and
déchargement de l'accumulateur est détecté par une appréciation de la direc- discharge of the accumulator is detected by an assessment of the
tion du courant qui modifie l'appréciation de l'intensité et l'appréciation de la tension en fonction du chargement ou du déchargement de la batterie, current which modifies the intensity evaluation and the evaluation of the voltage according to the charging or discharging of the battery,
2'4827312'482731
et en ce que la somme des tensions est établie par addition ou soustraction de la tension de mesure, le cas échéant amplifiée (appréciation de l'intensité) prise sur ladite résistance de shuntage, à (ou de) la tension aux bornes de la and in that the sum of the voltages is established by addition or subtraction of the measurement voltage, if necessary amplified (intensity evaluation) taken on said shunt resistor, at (or from) the voltage across the
batterie, le cas échéant amplifiée (appréciation de la tension). battery, if necessary amplified (appreciation of the voltage).
Dans un mode de mise en oeuvre avantageux, l'appréciation de la direction du courant est effectuée par une appréciation de la polarité de la tension de In an advantageous embodiment, the evaluation of the direction of the current is carried out by an evaluation of the polarity of the voltage of the
mesure prise sur la résistance de shuntage. measurement taken on the shunt resistance.
Dans une variante avantageuse, l'appréciation de la direction du courant est effectuée par la mesure de la tension aux bornes de la batterie, qui varie In an advantageous variant, the evaluation of the direction of the current is carried out by measuring the voltage at the terminals of the battery, which varies
dans le temps, dans le sens positif ou négatif. in time, in the positive or negative direction.
Les signaux de tension positifs ou négatifs d'appréciation de la direction du courant sont, le cas échéant, amplifiés et sont utilisés aux fins d'une commutation de l'appréciation de l'intensité et de l'appréciation de la tension The positive or negative voltage signals for evaluating the direction of the current are, if necessary, amplified and are used for the purpose of switching the evaluation of the intensity and the appreciation of the voltage.
aux bornes de la batterie.at the battery terminals.
Dans un mode d'exécution particulier du procédé selon l'invention, on In a particular embodiment of the method according to the invention,
peut effectuer l'appréciation de l'intensité en fonction du résultat de l'ap- can assess the intensity according to the result of the app-
préciation de la direction du courant en modifiant le facteur d'amplification d'un amplificateur opérationnel qui reçoit la tension de mesure prise sur precirculating the current direction by modifying the amplification factor of an operational amplifier which receives the measurement voltage taken from
ladite résistance de shuntage.said shunt resistor.
Dans un autre mode de mise en oeuvre avantageux de l'invention, on ef- In another advantageous embodiment of the invention, it is possible to
fectue l'appréciation de la tension aux bornes de la batterie en fonction du make an assessment of the voltage across the battery according to the
résultat de l'appréciation de la direction du courant en modifiant d'une va- result of the assessment of the direction of the current by modifying a
leur déterminée AU la valeur de la tension aux bornes de la batterie, la modi- determined by the value of the voltage at the battery terminals, the
fication de ladite valeur étant appréciée d'une manière analogique tenant compte de la caractéristique de polarisation de la batterie en fonction des variations de la tension dans la temps. A cette fin, on peut prendre, sur said value being evaluated in an analog manner taking into account the polarization characteristic of the battery as a function of the variations of the voltage over time. To this end, we can take, on
un diviseur de tension à résistance variable, une valeur de mesure propor- a variable resistance voltage divider, a proportionally
tionnelle à la tension aux bornes de la batterie. On fait varier la résistance tional to the voltage across the battery. The resistance is varied
variable d'une manière analogique tenant compte de la caractéristique de pola- variable in an analog way taking into account the characteristic of
risation de la batterie.the battery.
L'invention sera décrite ci-dessous de manière plus détaillée en référence The invention will be described below in more detail with reference
au dessin annexé qui est donné à titre d'illustration, mais non de limitation. in the accompanying drawing which is given by way of illustration, but not limitation.
La Figure unique du dessin représente un schéma de branchement simplifié The single figure in the drawing represents a simplified branch diagram
illustrant la mise en oeuvre du procédé selon l'invention. illustrating the implementation of the method according to the invention.
Le courant de déchargement ou de chargement produit, dans le circuit de charge 1 comportant une charge 2 et la batterie 3, un gradient de tension à The discharging or charging current produces, in the charge circuit 1 comprising a charge 2 and the battery 3, a voltage gradient at
travers la résistance de shuntage 4. through the shunt resistor 4.
La tension prise sur la résistance de shuntage 4 est appliquée, d'une part, à un amplificateur opérationnel OV-1 et est soumise, d'autre part, à The voltage taken on the shunt resistor 4 is applied, on the one hand, to an operational amplifier OV-1 and is subject, on the other hand, to
une appréciation de sa polarité. Cette appréciation de la polarité est ef- an appreciation of its polarity. This appreciation of the polarity is ef-
fectuée à l'aide d'un comparateur 7. Le signal de tension résultant est, le cas échéant, amplifié, et est utilisé en vue de l'actionnement d'un relais 8. Lorsque le relais 8 est enclenché, le facteur d'amplification auquel l'amplificateur opérationnel OV-1 est réglé est modifié de telle sorte que le facteur ainsi modifié corresponde au facteur d'amplification prévu pour 7. The resulting voltage signal is, if necessary, amplified, and is used for the actuation of a relay 8. When the relay 8 is engaged, the factor of the amplification at which the operational amplifier OV-1 is set is modified so that the factor thus modified corresponds to the amplification factor provided for
le processus de chargement. En même temps, la valeur de mesure, proportion- the loading process. At the same time, the measurement value, proportion
nelle à la tension aux bornes de la batterie, appliquée par l'intermédiaire du diviseur de tension R8/R9 à un amplificateur opérationnel OV-2 est modifiée grâce à une modification de la résistance R9 d'une valeur AR déterminée d'une manière analogique à partir de la polarisation de la batterie en fonction de la caractéristique tension/temps, c'est-à-dire à partir de la caractéristique the voltage across the battery, applied via the voltage divider R8 / R9 to an operational amplifier OV-2, is modified by a modification of the resistor R9 of a value AR determined in an analog way from the polarization of the battery according to the characteristic voltage / time, that is to say from the characteristic
de charge de la batterie, cette valeur étant obtenue dans un organe de com- of charge of the battery, this value being obtained in a communication device
mande 9.order 9.
La somme des tensions fournie par les amplificateurs opérationnels OV-1 The sum of the voltages provided by the OV-1 operational amplifiers
et OV-2 est comparée directement à une tension négative de référence corres- and OV-2 is compared directly to a negative reference voltage corresponding to
pondant au réglage d'un amplificateur opérationnel OV-4. En fonction de l'ap- when setting an OV-4 operational amplifier. Depending on the
préciation de la direction du courant et/ou du mode d'actionnement du relais 8, Precision of the direction of the current and / or the mode of actuation of the relay 8,
la tension de mesure prise sur la résistance de shuntage 4 est alors addition- the measurement voltage taken on the shunt resistor 4 is then added
née ou soustraite à (ou de) la tension aux bornes de la batterie, de sorte que la tension différentielle résultante représente toujours l'état exact de chargement de la batterie, tant pendant les étapes de déchargement que pendant les étapes de chargement. La tension différentielle ainsi obtenue est ensuite amplifiée dans un amplificateur opérationnel OV-3 et appliquée à un composant The result is that the resulting differential voltage always represents the exact state of charge of the battery, both during the unloading steps and during the charging steps. The differential voltage thus obtained is then amplified in an operational amplifier OV-3 and applied to a component
de commande à point lumineux 6 ou composant voltmétrique analogue qui trans- control device 6 or analog voltmetric component which transmits
forme la tension reçue en une valeur déterminée correspondant à l'état de form the received voltage into a determined value corresponding to the state of
chargement de la batterie.charging the battery.
Ainsi qu'il est déjà décrit dans la demande de brevet en République Fédérale d'Allemagne citée ci-dessus, la somme des tensions fournie par les amplificateurs opérationnels OV-1 et OV-2 peut, en outre, être soumise à des As already described in the patent application in the Federal Republic of Germany cited above, the sum of the voltages provided by the operational amplifiers OV-1 and OV-2 may, in addition, be subjected to
corrections à l'aide des tensions fournies respectivement par des amplifica- corrections using the voltages provided respectively by amplifiers
teurs opérationnels OV-7 et OV-8, ce qui permet d'effectuer une appréciation Operators OV-7 and OV-8, allowing for an assessment
de la température et de l'âge.temperature and age.
Bien entendu, la présente invention n'est nullement limitée aux modes de Of course, the present invention is not limited to the modes of
réalisation décrits et représentés; elle est susceptible de nombreuses va- described and illustrated embodiments; it is capable of many
riantes accessibles à l'homme de l'art, suivant les applications envisagées rants accessible to those skilled in the art, depending on the intended applications
et sans que l'on ne s'écarte de l'esprit de l'invention. and without departing from the spirit of the invention.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803018981 DE3018981A1 (en) | 1980-05-17 | 1980-05-17 | METHOD FOR CONTINUOUSLY MEASURING AND INDICATING THE CHARGE STATE OF A BATTERY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2482731A1 true FR2482731A1 (en) | 1981-11-20 |
| FR2482731B1 FR2482731B1 (en) | 1985-03-22 |
Family
ID=6102723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8109725A Granted FR2482731A1 (en) | 1980-05-17 | 1981-05-15 | METHOD FOR MEASURING AND CONTINUOUSLY DISPLAYING THE CHARGING STATUS OF AN ELECTRICAL ACCUMULATOR |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3018981A1 (en) |
| FR (1) | FR2482731A1 (en) |
| GB (1) | GB2076166B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576110A1 (en) * | 1985-01-11 | 1986-07-18 | Aerospatiale | System for displaying the amount of independent operation that can be guaranteed to an electrical installation by auxiliary storage batteries, and an electrical installation provided with such a system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3218148C2 (en) * | 1982-05-14 | 1984-05-03 | Deta-Akkumulatorenwerk Gmbh, 3422 Bad Lauterberg | Method and device for displaying the discharge status and for controlling the charging of a drive accumulator |
| DE3736481C2 (en) * | 1987-10-28 | 1996-10-02 | Graesslin Kg | Method and device for determining the energy content of electrochemical energy stores |
| DE3836569A1 (en) * | 1988-10-27 | 1990-05-03 | Martin Spies | METHOD FOR TESTING THE OPERATING CONDITION OF AN ELECTRIC ENERGY STORAGE OF MOTOR VEHICLES, AND DEVICE FOR IMPLEMENTING THE METHOD |
| US7496460B2 (en) | 2006-09-06 | 2009-02-24 | Eastway Fair Company Limited | Energy source monitoring and control system for power tools |
| DE102010020993A1 (en) * | 2010-05-19 | 2011-11-24 | Li-Tec Battery Gmbh | Method for controlling the maximum charging rate of an electrochemical energy storage device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2361754A1 (en) * | 1976-08-11 | 1978-03-10 | Accumulateurs Fixes | METHOD AND DEVICE FOR MONITORING THE CHARGE AND DISCHARGE OF AN ACCUMULATOR BATTERY |
| DE2500332B2 (en) * | 1974-01-11 | 1978-03-23 | Akkumulatorenfabrik Dr. Leopold Jungfer, Feistritz Im Rosental, Kaernten (Oesterreich) | Electrical display device for the state of charge of a secondary battery |
| US4151454A (en) * | 1976-09-20 | 1979-04-24 | Kabushiki Kaisha Aichi Denkikosakusho | Remaining capacity detector of a battery |
| FR2425160A1 (en) * | 1978-05-03 | 1979-11-30 | Accumulateurs Fixes | Accumulator charge and discharge control circuit - measures load and charge times to ensure constant charge rate irrespective of loading |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2400901C2 (en) * | 1974-01-09 | 1982-05-27 | Müller & Weigert GmbH, 8500 Nürnberg | Method and device for measuring the discharge status of batteries |
-
1980
- 1980-05-17 DE DE19803018981 patent/DE3018981A1/en active Granted
-
1981
- 1981-05-15 FR FR8109725A patent/FR2482731A1/en active Granted
- 1981-05-15 GB GB8114880A patent/GB2076166B/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2500332B2 (en) * | 1974-01-11 | 1978-03-23 | Akkumulatorenfabrik Dr. Leopold Jungfer, Feistritz Im Rosental, Kaernten (Oesterreich) | Electrical display device for the state of charge of a secondary battery |
| FR2361754A1 (en) * | 1976-08-11 | 1978-03-10 | Accumulateurs Fixes | METHOD AND DEVICE FOR MONITORING THE CHARGE AND DISCHARGE OF AN ACCUMULATOR BATTERY |
| US4151454A (en) * | 1976-09-20 | 1979-04-24 | Kabushiki Kaisha Aichi Denkikosakusho | Remaining capacity detector of a battery |
| FR2425160A1 (en) * | 1978-05-03 | 1979-11-30 | Accumulateurs Fixes | Accumulator charge and discharge control circuit - measures load and charge times to ensure constant charge rate irrespective of loading |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576110A1 (en) * | 1985-01-11 | 1986-07-18 | Aerospatiale | System for displaying the amount of independent operation that can be guaranteed to an electrical installation by auxiliary storage batteries, and an electrical installation provided with such a system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3018981A1 (en) | 1981-11-26 |
| DE3018981C2 (en) | 1988-10-27 |
| FR2482731B1 (en) | 1985-03-22 |
| GB2076166A (en) | 1981-11-25 |
| GB2076166B (en) | 1984-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2515815A1 (en) | METHOD AND APPARATUS FOR AUTOMATICALLY COMPENSATING FOR VARIATIONS IN SENSOR RESPONSE CHARACTERISTICS OR EQUIVALENT | |
| EP1107009A1 (en) | Current intensity measuring apparatus in a conductor | |
| FR2540630A1 (en) | FOURCAULT CURRENT MULTI-BURN PROBE HAVING A COIL BALANCING DEVICE | |
| FR2463932A1 (en) | SPEED DISPLAY DEVICE | |
| CA1074419A (en) | Method of measurement of the position of a magnetic rod | |
| EP0227861B1 (en) | Method for measuring a physical value provided with numerical data by the use of analog data measuring devices and measuring apparatus therefor | |
| FR2482731A1 (en) | METHOD FOR MEASURING AND CONTINUOUSLY DISPLAYING THE CHARGING STATUS OF AN ELECTRICAL ACCUMULATOR | |
| FR2550628A1 (en) | METHOD AND DEVICE FOR MEASURING THE INITIAL PERMEABILITY OF FERRIIMAGNETIC MATERIALS IN A BROADBAND OF FREQUENCIES | |
| EP0800644B1 (en) | Temperature sensing method using a negative temperature coefficient sensor and device therefore | |
| EP1198715B1 (en) | Method and device for individually determining the ageing condition of a capacitor | |
| CA1221416A (en) | Very weak electric resistance measuring ohmmeter | |
| FR2574556A1 (en) | CIRCUIT FOR VERIFYING THE CURRENT OF A GENERATOR | |
| CA1287906C (en) | Device for the measurement of flatness defects in a strip | |
| EP1217707B1 (en) | Device for termination of primary current in a current transformer having saturation compensation means | |
| EP0162990B1 (en) | Monoway measuring head and telemetry installation including such a head | |
| FR2496894A1 (en) | CIRCUIT FOR CONTROLLING AN ELECTROSTATIC ACCELEROMETER | |
| EP0148685B1 (en) | Direct current differential amplifier arrangement, especially for the measurement of slowly varying weak voltages | |
| FR2480191A1 (en) | INSTALLATION FOR CONTROLLING AND MONITORING ADJUSTING DEVICES FOR PRINTING MACHINES | |
| WO1999013348A1 (en) | Method and device for determining a capacitor ageing condition | |
| EP1336857A1 (en) | System for determining the state of charge of a battery, especially for a motor vehicle | |
| FR2925668A1 (en) | Capacitive unit's gain correcting method for mechanical resonator in axisymmetric vibrating gyroscope, involves measuring output signal of capacitive unit, and calculating gain correction of capacitive unit | |
| WO2007080304A1 (en) | Battery circuit breaker comprising current-measuring means | |
| FR3098294A1 (en) | Device for measuring the spacing of two parts of a catenary tensioning device | |
| FR2777348A1 (en) | Method for measuring oil level | |
| EP1845386A2 (en) | Method and system of determining the proper working condition of electric energy storage means |