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1. (WO1990006522) INDICATEUR D'ETAT DE CHARGE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
CLAIMS
1. A dynamic state of charge indicator for a storage battery characterized by a discharge curve relating available energy of said battery to a contemporaneous voltage over a range of voltage boundaries having predetermined end points
corresponding to fully charged and effectively discharged for one charge cycle, said indicator comprising:
(a) microprocessor means for storing predetermined relationships between the
contemporaneous voltage and the state of charge of the battery;
(b) voltage sensor means for monitoring battery voltage and providing a battery voltage signal to said microprocessor means;
(c) current sensor means for monitoring current flow through said battery and providing a battery current signal to said microprocessor means;
(d) said microprocessor means computing:
(1) the internal resistance
of said battery;
(2) the average voltage and
current for a net discharge time period;
(3) the corrected voltage as
a total of internal resistance voltage
loss and average voltage; and
(4) the state of charge as a
function of the corrected battery voltage;
and
(e) means for displaying the state of charge.
2. A method for determining the dynamic state of charge of a storage battery into and out of which current flows, said battery being
characterized by a discharge curve relating
available energy of the battery to a contemporanecus

BSTITUTE SHEET voltage over a range of voltage boundaries having predetermined end points corresponding to fully
charged and effectively discharged for one charge cycle, said method comprising steps of:
(a) monitoring the current and voltage across the battery;
(b) determining the internal resistance of the battery from the monitored current and
voltage;
(c) calculating the average voltage and current periodically over determined time period;
(d) correcting the average voltage to include the internal resistance voltage loss;
(e) generating a corrected voltage
signal;
(f) applying the corrected voltage
signal to the discharge curve to determine the
state of charge of the battery; and
(g) generating an output signal
indicating the state of charge of the battery.
3. The method according to claim 2 wherein said determining step includes the steps of sensing current surges and voltage drops of the monitored current and voltage and calculating the internal resistance of the battery from the sensed current surges and voltage drops .
4. The method according to claim 2 wherein said determining step includes the steps of applying an AC current and measuring the corresponding AC voltage across the battery and calculating the internal
resistance from the AC current and voltage.
5. The method according to claim 2, 3 or 4 including the steps of monitoring the amphours out of the battery, monitoring the amphours into the battery and calculating the amphours state of charge of the

SUBSTITUTE SHEET battery from monitored amphours in and out of the battery and the discharge state of charge.
6. A method for. determining the dynamic
state of charge of a storage battery in an
automotive vehicle connected to a alternator,
comprising the steps of:
(a) monitoring the current and voltage across the battery;
(b) calculating the average current and resistance over a predetermined period of time;
(c) calculating the internal resistance of the battery from the monitored current and
voltage;
(d) determining the internal resistance voltage loss from the calculated average current and average voltage;
(e) correcting the average voltage
calculation to include the internal resistance
voltage loss;
(f) calculating the corrected voltage by combining the average voltage with the internal resistance voltage loss; and
(g) determining the state of charge as a function of corrected voltage, said determining step being carried out in accordance with
predetermined relationship between average current, average voltage and internal resistance of the
battery.
7. The method according to claim 6 wherein the step of calculating the internal resistance of the battery includes the steps of monitoring the chopped DC current of the alternator and the corresponding AC voltage ripple across the battery.
- 8. A method for monitoring the state of
charge of a battery operating in a discharge mode comprising the steps of:

SUBSTITUTE SHEET (a) continuously monitoring the voltage of the battery;
(b) continuously monitoring the current of the battery;
(c) periodically computing the internal resistance of the battery from the monitored current and voltage;
(d) computing the average voltage and
average current for predetermined time periods;
(e) correcting the average voltage for the predetermined time period adding the internal resistance voltage loss to the average voltage;
(f) determining the state of charge of the battery from the computed corrected voltage;
and
(i) said determining step being carried out in accordance with predetermined relationships between corrected voltage and remaining state of
charge.
9. The method according to claim 8 wherein said determining step includes the steps of sensing current surges in the monitored current, sensing voltage drops in the monitored voltage and calculating the internal resistance from the sensed current surges and voltage drops.
10. The method according to claim 8 wherein said determining steps includes the steps of applying an AC current across the battery and calculating the internal resistance from the measured AC voltage.

SUBSTITUTE SHEET