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

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,
• wherein 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 equal to or smaller than the second full-charge capacity,
• wherein 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 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.

A state-of-charge estimating method 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, characterized by comprising:

• estimating a first state of charge of the storage device when the storage device starts being charged by the charging device;
• calculating 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;
• estimating a second state of charge of the storage device at the completion of the charging of the storage device by the charging device;
• estimating 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
• calculating 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,
• wherein the third full-charge capacity is calculated 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,
• wherein the third full-charge capacity is calculated 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.

A state-of-charge estimating method 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:

• estimating a first state of charge of the storage device when the storage device starts being charged by the charging device;
• calculating 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;
• estimating a second state of charge of the storage device at the completion of the charging of the storage device by the charging device;
• estimating 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
• calculating 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,
• wherein the third full-charge capacity is calculated using a 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 smaller than the second full-charge capacity,
• wherein the third full-charge capacity is calculated 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 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.