Vehicle battery's open circuit voltage estimating method and a system therefor
First Claim
1. A vehicle battery'"'"'s open circuit voltage estimating method for estimating an open circuit voltage of a vehicle-borne battery supplying electric power to vehicle-borne loads, comprising the steps of:
- measuring a disconnected voltage of the battery multiple times in a definite period of time after a predetermined period of time after completion of charge or discharge of the battery;
determining a power approximate expression having a negative power number by using a difference value of the measured disconnected voltage and an assumed open circuit voltage;
repeating the determination of the power approximate expression by updating the assumed open circuit voltage until the power number of the determined power approximate expression becomes −
0.5 or about −
0.5; and
estimating the assumed open circuit voltage to be the open circuit voltage when the power number becomes −
0.5 or about −
0.5.
1 Assignment
0 Petitions
Accused Products
Abstract
A vehicle battery'"'"'s open circuit voltage estimating method and a system therefor for relatively correctly estimating an open circuit voltage of a battery on a vehicle within a relatively short period after completion of the charge or the discharge also without a temperature correction is provided. A disconnected voltage measuring means 23a-1 measures a disconnected voltage of the battery multiple times in a definite period of time after a predetermined period of time after completion of charge or discharge of the battery. An approximate expression determining means 23a-2 determines a power approximate expression having a negative power number by using a difference value of the measured disconnected voltage and an assumed open circuit voltage. And, an arithmetic operation controlling means 23a-3 makes the approximate expression determining means update the assumed open circuit voltage and determine the power approximate expression repeatedly until the power number of the determined power approximate expression becomes −0.5 or about −0.5, and the assumed open circuit voltage is estimated to be the open circuit voltage when the power number becomes −0.5 or about −0.5.
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Citations
8 Claims
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1. A vehicle battery'"'"'s open circuit voltage estimating method for estimating an open circuit voltage of a vehicle-borne battery supplying electric power to vehicle-borne loads, comprising the steps of:
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measuring a disconnected voltage of the battery multiple times in a definite period of time after a predetermined period of time after completion of charge or discharge of the battery;
determining a power approximate expression having a negative power number by using a difference value of the measured disconnected voltage and an assumed open circuit voltage;
repeating the determination of the power approximate expression by updating the assumed open circuit voltage until the power number of the determined power approximate expression becomes −
0.5 or about −
0.5; and
estimating the assumed open circuit voltage to be the open circuit voltage when the power number becomes −
0.5 or about −
0.5. - View Dependent Claims (2, 3, 4)
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5. A vehicle battery'"'"'s open circuit voltage estimating system for estimating an open circuit voltage of a vehicle-borne battery supplying electric power to vehicle-borne loads, comprising:
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a disconnected voltage measuring means for measuring a disconnected voltage of the battery multiple times in a definite period of time after a predetermined period of time after completion of charge or discharge of the battery;
an approximate expression determining means for determining a power approximate expression having a negative power number by using a difference value of the measured disconnected voltage and an assumed open circuit voltage; and
an arithmetic operation controlling means for making the approximate expression determining means update the assumed open circuit voltage and determine the power approximate expression repeatedly until the power number of the determined power approximate expression becomes −
0.5 or about −
0.5,wherein the assumed open circuit voltage is estimated to be the open circuit voltage when the power number becomes −
0.5 or about −
0.5. - View Dependent Claims (6, 7, 8)
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Specification