BATTERY RESIDUAL CAPACITY ESTIMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a battery residual capacity estimation device devised capable of precisely estimating SOC from release voltage which improves precision by putting weight on estimated release voltage at the time of non-load driving and load driving by finding battery inside resistance in accordance with a value of previous SOC.

SOLUTION: Motor output of a battery load electric current is found from the number of rotation at a current point of time of an inverter motor which is a load of a battery and a torque command by providing a total efficiency map of the inverter motor including motor efficiency and inverter efficiency in case of the inverter motor. The battery load electric current is computed from battery output electric power and voltage between battery terminals after finding the battery output electric power from efficiency derived from the total efficiency map of this motor output and the inverter motor.

COPYRIGHT: (C)2006,JPO&NCIPI