Upper-limit of state-of-charge estimating device and upper-limit of state-of-charge estimating method

摘要

A PM-ECU executes a program including: a step (S104) of estimating pre-charge SOC(1) when a plug-in charge is started (YES in S100), a step (S108) of calculating an integrated value of charging current when integration permitting conditions are satisfied (YES in S104, YES in S106), a step (S112) of setting a final integrated value when the charge is completed, a step (S116) of estimating post-charge SOC(2) when an ignition switch is turned on (YES in S114), a step (S122) of calculating a full-charge capacity of this cycle when calculation conditions are satisfied (YES in S120), a step (S128) of calculating a new full-charge capacity when the full-charge capacity of this cycle is within a specified range (YES in S124), and a step (S130) of updating the full-charge capacity by setting the new full-charge capacity as the current full-charge capacity when the new full-charge capacity is within a specified range (YES in S128).

主权项

1. A state-of-charge estimating device for estimating a full-charge capacity of a storage device that is installed on a vehicle and can be charged using a charging device outside the vehicle, comprising:
a first estimating unit that estimates a first state of charge of the storage device when the storage device starts being charged by the charging device; an integrating unit that calculates an integrated value of charging current over a period of time from start of charging of the storage device by the charging device to completion of the charging; a second estimating unit that estimates a second state of charge of the storage device at the completion of the charging of the storage device by the charging device; a third estimating unit that estimates a first full-charge capacity, based on the first state of charge, the second state of charge, and the integrated value of charging current; and a calculating unit that calculates a final third full-charge capacity in a current charging control cycle, based on the first full-charge capacity of the current charging control cycle and a final second full-charge capacity calculated in a last charging control cycle, the calculating unit calculates the third full-charge capacity using a first weight, based on the first full-charge capacity and the second full-charge capacity, when the first full-charge capacity is smaller than the second full-charge capacity, the calculating unit calculates the third full-charge capacity using a second weight that is different from the first weight, based on the first full-charge capacity and the second full-charge capacity, when the first full-charge capacity is equal to or larger than the second full-charge capacity, and wherein the first weight assigned to the first full-charge capacity is set to be larger than the second weight assigned to the first full-charge capacity.