Methods and apparatus for battery monitoring, characterisation and reserve time estimation
First Claim
1. A method of battery monitoring including the steps of:
- a) acquiring a battery voltage measurement from the battery;
b) acquiring a time measurement associated with the battery voltage measurement acquired in step a);
c) determining a scaled voltage value by scaling the battery voltage measurement made in step a) with respect to a predetermined end voltage;
d) determining a scaled time value from the scaled voltage value determined in step c) in accordance with a predetermined battery characteristic; and
e) obtaining a reserve time from the scaled time value determined in step d), the reserve time being indicative of the difference between the time measurement acquired in step b) and an end time associated with the predetermined end voltage.
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Abstract
A method of battery monitoring including the steps of: acquiring a battery voltage measurement from the battery; and acquiring a time measurement associated with the battery voltage measurement. A scaled voltage value is determined by scaling the battery voltage measurement with respect to a start voltage and/or predetermined end voltage. A scaled time value is determined from the scaled voltage value in accordance with a predetermined battery characteristic. An absolute reserve time value is then obtained from the scaled time value, the reserve time being indicative of the difference between the time measurement and an end time associated with the predetermined end voltage.
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Citations
40 Claims
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1. A method of battery monitoring including the steps of:
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a) acquiring a battery voltage measurement from the battery;
b) acquiring a time measurement associated with the battery voltage measurement acquired in step a);
c) determining a scaled voltage value by scaling the battery voltage measurement made in step a) with respect to a predetermined end voltage;
d) determining a scaled time value from the scaled voltage value determined in step c) in accordance with a predetermined battery characteristic; and
e) obtaining a reserve time from the scaled time value determined in step d), the reserve time being indicative of the difference between the time measurement acquired in step b) and an end time associated with the predetermined end voltage. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36)
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2. A method of battery monitoring including the steps of:
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a) acquiring a battery voltage measurement from the battery;
b) acquiring a time measurement associated with the battery voltage measurement acquired in step a);
c) determining a scaled voltage value by scaling the battery voltage measurement made in step a) with respect to a start voltage and a predetermined end voltage;
d) determining a scaled time value from the scaled voltage value determined in step c) in accordance with a predetermined battery discharge characteristic; and
e) obtaining an absolute time value from the scaled time value determined in step d). - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 32, 37, 38, 39, 40)
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12. A method of characterising a battery including:
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a) acquiring a plurality of battery voltage measurements from the battery, the battery voltage measurements including a start voltage and an end voltage;
b) acquiring a plurality of time measurements, each time measurement being associated with a respective battery voltage measurement, the time measurements including an end time associated with the end voltage;
c) determining a plurality of scaled voltage values by scaling each battery voltage measurement with respect to the start voltage and the end voltage;
d) determining a plurality of scaled time values by scaling each time measurement with respect to the end time; and
e) storing a battery discharge characteristic indicative of the relationship between the scaled voltage values and the scaled time values. - View Dependent Claims (13, 15, 17, 18, 19, 20, 21)
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16. (canceled)
Specification