Patent ID: 8645088

Claim:
A method for determining a state of charge of a vehicle battery comprising: providing a computer-based system comprising an input, an output, a processor, memory and program code comprising at least a confidence evaluator; operating the program code such that calculations made thereby are performed by said processor; receiving into said system sensor data indicative of a voltage, current, and temperature of the battery; determining with said system a first state of charge value using a voltage-based strategy on the sensor data; calculating with said system a first confidence value for the first state of charge value; determining with said system a second state of charge value using a current-based strategy on the sensor data; calculating with said system a second confidence value for the second state of charge value; comparing the first confidence value and second confidence value with the confidence evaluator; selecting between the first state of charge value and the second state of charge value based on the comparison; and storing the selected state of charge value in said system as an overall state of charge value.