Battery state-of-charge indicator
First Claim
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1. A method for providing a representation of the state-of-charge of a battery comprising the steps of:
- (a) sensing the value of terminal voltage of the battery;
(b) storing a value representative of the open circuit terminal voltage of the battery; and
,(c) decreasing the stored value representative of open circuit battery terminal voltage at a first rate which is proportional to the difference between the stored value and the sensed value of battery terminal voltage when the sensed value is less than the stored value.
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Abstract
Apparatus for providing a continuous indication of battery state-of-charge under load in a system in which the battery is subject to varying load conditions. The apparatus stores a value representative of battery open circuit terminal voltage and reduces the stored value while the battery is loaded at a rate proportional to the difference between the stored value and a scaled value of actual battery terminal voltage. If the scaled value exceeds the stored value, the stored value is increased to a value corresponding to the scaled value.
21 Citations
10 Claims
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1. A method for providing a representation of the state-of-charge of a battery comprising the steps of:
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(a) sensing the value of terminal voltage of the battery; (b) storing a value representative of the open circuit terminal voltage of the battery; and
,(c) decreasing the stored value representative of open circuit battery terminal voltage at a first rate which is proportional to the difference between the stored value and the sensed value of battery terminal voltage when the sensed value is less than the stored value. - View Dependent Claims (2, 3)
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4. Apparatus for providing a representation of the state-of-charge of a battery comprising:
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(a) means connected for sensing the magnitude of terminal voltage of the battery and for developing a first signal representative thereof; (b) means connected for receiving and storing said first signal; (c) means for comparing said stored first signal to subsequently developed ones of said first signals and for generating a second signal representative of the difference therebetween; (d) means for reducing the value of said stored first signal at a first rate proportional to said second signal when said stored first signal is representative of a greater battery voltage magnitude than that represented by said subsequently developed first signals; and
,(e) means for increasing the value of said stored first signal at a second rate proportional to said second signal when said subsequently developed first signals are representative to a battery voltage magnitude greater than that represented by said stored first signal. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification