Method for battery capacity estimation
First Claim
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1. A method of estimating a battery capacity for a battery, the method comprising the steps of:
- (a) determining a state of charge at a first instant of time and at a second instant of time independent of battery capacity;
(b) determining a difference in the state of charge between the first instant of time and the second instant of time;
(c) calculating a net coulomb flow between the first instant of time and the second instant of time; and
(d) determining the battery capacity as a function of the change in the state of charge and the net coulomb flow.
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Abstract
An embodiment contemplates a method for estimating a capacity of a battery. A state of charge is determined at a first instant of time and at a second instant of time. A difference in the state of charge is determined between the first instant of time and the second instant of time. A net coulomb flow is calculated between the first instant of time and the second instant of time. The battery capacity is determined as a function of the change in the state of charge and the net coulomb flow.
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Citations
19 Claims
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1. A method of estimating a battery capacity for a battery, the method comprising the steps of:
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(a) determining a state of charge at a first instant of time and at a second instant of time independent of battery capacity; (b) determining a difference in the state of charge between the first instant of time and the second instant of time; (c) calculating a net coulomb flow between the first instant of time and the second instant of time; and (d) determining the battery capacity as a function of the change in the state of charge and the net coulomb flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for determining a battery capacity for a battery, the apparatus comprising:
- at least one sensor for monitoring a characteristic of the vehicle battery; and
an electronic control module coupled to the at least one sensor for receiving a sensed input signal, the electronic control module including a processing unit for determining a difference in a state of charge between a first instance of time and a second instance of time independent of battery capacity, the processing unit determining a net coulomb flow between the first instance of time and the second instance of time, the processing unit further determining the battery capacity as a function of the difference in the state of charge and the net coulomb flow. - View Dependent Claims (15, 16, 17, 18)
- at least one sensor for monitoring a characteristic of the vehicle battery; and
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19. A method of estimating a battery capacity for a battery, the method comprising the steps of:
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(a) determining a state of charge at a first instant of time and at a second instant of time; (b) determining a difference in the state of charge between the first instant of time and the second instant of time; (c) calculating a net coulomb flow between the first instant of time and the second instant of time; and (d) determining the battery capacity as a function of the change in the state of charge and the net coulomb flow; wherein steps (a)-(d) are repeated for determining a plurality of battery capacities over multiple intervals, the plurality of battery capacities being filtered for providing a factored battery capacity value.
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Specification