ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,530, issued on Jan. 27, was assigned to DENSO Corp. (Kariya, Japan).
"Impedance calculation apparatus and battery management system" was invented by Tetsuya Hori (Nisshin, Japan) and Masaaki Kitagawa (Kariya, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 lea...