Patent ID: 7983862

Claim:
A battery state-of-health monitoring and prognosis method comprising: training off-line parity-relation parameters using a linear regression model between extracted battery voltage and current signals during off-line battery discharge events corresponding to an engine cranking using at least one off-line battery capable of delivering a desired power to crank the engine; extracting portions of terminal voltage and current signals of an on-board battery after an initial voltage drop during an on-board engine cranking event; estimating battery voltage of the on-board battery based on the parity-relation parameters and the extracted portions of the on-board battery current signals extracted during the on-board engine cranking event; generating a diagnostic residual defining a deviation between the battery voltage estimation of the on-board battery and extracted portions of the on-board battery terminal voltage signals extracted during the on-board engine cranking event; and providing a measure of battery state-of-health based on said diagnostic residual, comprising: generating a battery state-of-health index (SOH INDEX ) in accordance with the relationship S ⁢ ⁢ O ⁢ ⁢ H INDEX = r - r _ r fresh - r _ * 100 ⁢ % ; wherein r is said diagnostic residual, r is a predetermined diagnostic residual threshold, and r fresh is a predetermined nominal residual of a fresh battery.