Patent ID: 7589532

Claim:
A system for estimating a state vector associated with a battery, the system comprising: a voltage sensor configured to measure a voltage output from the battery; and a computer operably coupled to the voltage sensor, the computer configured to determine a time interval that the battery has been electrically decoupled from a load circuit, the time interval staffing at a first time; the computer further configured to obtain a first state vector associated with the battery from a memory, the first state vector being determined prior to the first time; the computer further configured to calculate a second predicted state vector associated with the battery based on the first state vector and the time interval that the battery has been electrically decoupled from the load circuit; the computer further configured to induce the voltage sensor to measure the voltage output from the battery to obtain a first battery voltage value after the first time interval when the battery is electrically coupled to the load circuit; the computer further configured to estimate a second battery voltage value associated with the battery based on the second predicted state vector; the computer further configured to calculate a voltage error value based on the first battery voltage value and the second battery voltage value; the computer further configured to calculate a third estimated state vector associated with the battery based on the second predicted state vector and the voltage error value.