BATTERY STATE OF HEALTH MONITORING SYSTEM AND METHOD
First Claim
1. A state-of-health monitoring and prognosis method for a battery comprising:
- monitoring battery terminal voltage and current;
extracting a portion of said battery terminal voltage and current corresponding to an engine cranking event;
estimating a battery voltage loss (Vloss) that occurs during said engine cranking event from the extracted portion of battery terminal voltage and current; and
comparing the estimated battery voltage loss (Vloss) with a predetermined voltage loss threshold ( Vloss) to determine battery state-of-health.
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Abstract
A state-of-health monitoring and prognosis method and system for a battery includes a signal preprocessing module for monitoring battery terminal voltage and current and extracting a portion of the battery terminal voltage and current corresponding to an engine cranking event. Battery voltage loss that occurs during said engine cranking event is estimated from the extracted portion of battery terminal voltage and current by a voltage loss estimation module. The estimated battery voltage loss is compared with a predetermined voltage loss threshold to determine battery state-of-health by a state-of-health evaluation module.
37 Citations
20 Claims
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1. A state-of-health monitoring and prognosis method for a battery comprising:
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monitoring battery terminal voltage and current; extracting a portion of said battery terminal voltage and current corresponding to an engine cranking event; estimating a battery voltage loss (Vloss) that occurs during said engine cranking event from the extracted portion of battery terminal voltage and current; and comparing the estimated battery voltage loss (Vloss) with a predetermined voltage loss threshold ( V loss) to determine battery state-of-health. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16)
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9. The method of 8, wherein the predefined threshold is substantially −
- 100 Amps.
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17. A state-of-health monitoring and prognosis system for a vehicular battery used in an engine starting application, comprising:
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a signal preprocessing module for receiving a plurality of inputs from a plurality of sensors that sense a plurality of battery parameters, wherein the signal preprocessing module extracts battery current and voltage signals corresponding to an engine cranking event; a voltage loss estimation module providing a voltage loss signal corresponding to battery voltage loss that occurs during engine cranking events based on said extracted battery current and voltage signals and a measure of battery open-circuit-voltage; and a state-of-health evaluation module providing a battery state-of-health signal based on said voltage loss output signal. - View Dependent Claims (18, 19, 20)
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Specification