초록 ▼

A microprocessor samples the net effective current from a battery several times a second. A fast average current I.sub.f is calculated using an IIR filter on the net average current. A slow average current I is calculated by integrating the net average current over time with respect to time. An Ampe

A microprocessor samples the net effective current from a battery several times a second. A fast average current I.sub.f is calculated using an IIR filter on the net average current. A slow average current I is calculated by integrating the net average current over time with respect to time. An Ampere Hour Capacity is calculated by the use of the Peukert equation, which is split into two terms. A first capacity term is calculated using the fast average current I.sub.f and a slow capacity term is calculated using the slow average current I. The slow capacity term is then multiplied by a weighting constant C.sub.2 and summed with the fast capacity term which is multiplied by (1-C.sub.2).

대표청구항 ▼

[ We claim:] [9.] A method for calculating the State of Charge (SOC) for a storage battery used as an energy source for the propulsion system of an electric vehicle, comprising the steps of:measuring the net discharge current I for the operating battery,calculating a fast average current I.sub.f usi

[ We claim:] [9.] A method for calculating the State of Charge (SOC) for a storage battery used as an energy source for the propulsion system of an electric vehicle, comprising the steps of:measuring the net discharge current I for the operating battery,calculating a fast average current I.sub.f using the equation ]EQU14 ] where C.sub.1 is a constant matched with the battery characteristics, calculating a slow average current I using the equation ]EQU15 ] and calculating the Ampere Hour Capacity using the equation EQU Ampere Hour Capacity=C.sub.2 *P.sub.1 (I).sup.-P.sbsp.2 +(1-C.sub.2)*P.sub.1 (I.sub.f).sup.-P.sbsp.2where P.sub.1 and P.sub.2 are Peukert constants and C.sub.2 is a weighting constant determined to match the operating characteristics of the battery being measured,measuring the Ampere Hours Consumed from the net discharge current I for the battery, andcalculating the State of Charge (SOC) using the equation ]EQU16 ]