US 12,000,903 B2
Impedance determination with phase determination
Jan Philipp Schmidt, Holzmaden (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/770,771
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Oct. 23, 2020, PCT No. PCT/EP2020/079947
§ 371(c)(1), (2) Date Apr. 21, 2022,
PCT Pub. No. WO2021/083813, PCT Pub. Date May 6, 2021.
Claims priority of application No. 10 2019 129 449.5 (DE), filed on Oct. 31, 2019.
Prior Publication US 2022/0365142 A1, Nov. 17, 2022
Int. Cl. G01R 31/389 (2019.01); G01R 31/367 (2019.01)
CPC G01R 31/389 (2019.01) [G01R 31/367 (2019.01)] 11 Claims
OG exemplary drawing
 
1. A method for determining an impedance of an electrical or electrochemical component with correction of a synchronization error, the method comprising:
choosing an impedance model for the component, which has a resistance and an inductance;
applying an excitation signal with a first frequency and a second frequency;
measuring a response signal, which is beset by the synchronization error relative to the excitation signal;
determining a first impedance at the first frequency and a second impedance at the second frequency from the excitation signal and the response signal;
determining the synchronization error as a value for which a deviation between a difference between the second impedance and the first impedance and a corresponding value of an impedance difference that is calculated for an equivalent circuit diagram falls below a predetermined threshold value in respect of at least one impedance component; and
correcting values of the first impedance and the second impedance using the synchronization error.