Battery state judging method, and battery state judging apparatus
First Claim
1. A battery state judging method of a lead-acid battery loaded on a vehicle, comprising the steps of:
- obtaining, in advance, a DC internal resistance r0 of a lead-acid battery in a substantially non-deteriorated and fully-charged state;
calculating, in advance, a load R imposed at an engine starting time, using a following Equation (1), from an open-circuit voltage OCV0 and a lowest voltage Vst0 at the engine starting time, both measured when the lead-acid battery is in a substantially non-deteriorated and fully-charged state, and the DC internal resistance r0;
calculating a DC internal resistance r of the lead-acid battery, using a following Equation (2), from an open-circuit voltage OCV and a lowest voltage Vst at an engine starting time, both measured when the lead-acid battery is in a deteriorated or insufficiently-charged state, and the calculated load R imposed at the engine starting time; and
judging a state of the lead-acid battery by comparing the DC internal resistance r with the DC internal resistance r0;
R=r0×
Vst0/(OCV0−
Vst0)
(1)
r=R×
(OCV−
Vst)/Vst
(2).
1 Assignment
0 Petitions
Accused Products
Abstract
A battery state judging method is provided capable of properly judging a state of a lead-acid battery by measuring voltages without measuring currents. A state of the battery is judged by obtaining, in advance, a DC internal resistance r0 of a same type battery in a new and fully-charged state; calculating, in advance, a load R [R=r0×Vst0/(OCV0−Vst0)] at an engine starting time (S112) from an open-circuit voltage OCV0 (S104) and a lowest voltage Vst0 (S108) at the engine starting time, both measured when the loaded battery is in a new and fully-charged state, and the DC internal resistance r0; calculating a DC internal resistance r [(r=R/(OCV−Vst)/Vst)] of the loaded battery from an open-circuit voltage OCV (S104) and a lowest voltage Vst (S108), both measured when the loaded battery is in a deteriorated/insufficiently-charged state, and the load R; and comparing r and r0.
-
Citations
10 Claims
-
1. A battery state judging method of a lead-acid battery loaded on a vehicle, comprising the steps of:
-
obtaining, in advance, a DC internal resistance r0 of a lead-acid battery in a substantially non-deteriorated and fully-charged state; calculating, in advance, a load R imposed at an engine starting time, using a following Equation (1), from an open-circuit voltage OCV0 and a lowest voltage Vst0 at the engine starting time, both measured when the lead-acid battery is in a substantially non-deteriorated and fully-charged state, and the DC internal resistance r0; calculating a DC internal resistance r of the lead-acid battery, using a following Equation (2), from an open-circuit voltage OCV and a lowest voltage Vst at an engine starting time, both measured when the lead-acid battery is in a deteriorated or insufficiently-charged state, and the calculated load R imposed at the engine starting time; and judging a state of the lead-acid battery by comparing the DC internal resistance r with the DC internal resistance r0;
R=r0×
Vst0/(OCV0−
Vst0)
(1)
r=R×
(OCV−
Vst)/Vst
(2). - View Dependent Claims (2, 3)
-
-
4. A battery state judging apparatus that judges a state of a lead-acid battery loaded on a vehicle, comprising:
-
a storing means which stores, in advance, a DC internal resistance r0 of a lead-acid battery obtained in a substantially non-deteriorated and fully-charged state; an open-circuit voltage measuring means which measures an open-circuit voltage of the lead-acid battery; a lowest voltage measuring means which measures a lowest voltage at an engine starting time of the lead-acid battery; a load calculating means which calculates a load R imposed at an engine starting time, using a following Equation (1), from an open-circuit voltage OCV0 measured by the open-circuit voltage measuring means and a lowest voltage Vst0 at the engine starting time measured by the lowest voltage measuring means, both measured when the lead-acid battery is in a substantially non-deteriorated and fully-charged state, and the DC internal resistance r0 stored in the storing means; a DC internal resistance calculating means which calculates a DC internal resistance r of the lead-acid battery, using a following Equation (2), from an open-circuit voltage OCV measured by the open-circuit voltage measuring means and a lowest voltage Vst at an engine starting time measured by the lowest voltage measuring means, both measured when the lead-acid battery is in a deteriorated or insufficiently-charged state, and the load R imposed at the engine starting time calculated by the load calculating means; and a state judging means which judges a state of the lead-acid battery by comparing the DC internal resistance r calculated by the DC internal resistance calculating means with the DC internal resistance r0 stored in the state storing means;
R=r0×
Vst0/(OCV0−
Vst0)
(1)
r=R×
(OCV−
Vst)/Vst
(2). - View Dependent Claims (5, 6, 7, 8, 9, 10)
-
Specification