公开(公告)号：US20240027534A1

公开(公告)日：2024-01-25

申请号：US18375618

申请日：2023-10-02

Applicant: DENSO CORPORATION

Inventor： Tetsuya HORI ,  Masaaki KITAGAWA

IPC: G01R31/389 ,  G01R31/382

CPC classification number: G01R31/389 ,  G01R31/382 ,  G01R31/392

Abstract: An impedance calculation apparatus applicable to a power source system provided with a storage battery, applying an AC signal to the storage battery to calculate an impedance of the storage battery, during a predetermined impedance calculation period, the impedance calculation apparatus includes: an error calculation unit that applies the AC signal having a specified frequency at which at least either a real part component or an imaginary part component of an impedance of the storage battery is a specific value, to calculate an impedance error of the storage battery, during an error calculation period different from the impedance calculation period; an impedance calculation unit that calculates an impedance of the storage battery during the impedance calculation period; and a correction unit that corrects, based on the impedance error, the impedance of the storage battery calculated by the impedance calculation unit.