Patent ID: 7518375

Claim:
A method of estimating a maximum output of a battery for a hybrid electric vehicle comprising steps of: extracting maximum charge or discharge outputs of the battery depending on a plurality of charged states (SOC) of the battery under which the vehicle is able to be driven and calculating an interrelation between them; extracting maximum charge or discharge outputs of the battery at plural temperatures (temp) under which the vehicle is able to be driven, and calculating an interrelation between them; extracting degradations of outputs of the battery as a capacity of the battery is discharged (accumulated discharge Ah) during traveling, and calculating an interrelation between them; and based on the interrelations obtained from each of the steps, estimating a maximum output (Power max ) of the battery through a following function: Power max = F ⁡ ( SOC , temp , accumulated ⁢ ⁢ discharge ⁢ ⁢ Ah ) = F ⁡ ( SOC , temp ) ⨯ F ⁡ ( accumulated ⁢ ⁢ discharge ⁢ ⁢ Ah ) , wherein F(accumulated discharge Ah)=C 5 k 5 +C 4 k 4 +C 3 k 3 +C 2 k 2 +C 1 k+C 0 , where each of C 5 ˜C 0 is constant, and k is a discharged capacity of the battery, is within a range of [0, 300000] and is inputted with a modified value within a range of [−1, 1] when it is inputted as an input value into the function.