US 12,449,464 B2
Method for determining at least one current capacitance value of a Y capacitance of a high-voltage wiring system, as well as an electronic computing device
Tobias Aurand, Ludwigsburg (DE); and Markus Zimmer, Leinfelden-Echterdingen (DE)
Assigned to Mercedes-Benz Group AG, Stuttgart (DE)
Appl. No. 18/254,825
Filed by Mercedes-Benz Group AG, Stuttgart (DE)
PCT Filed Nov. 2, 2021, PCT No. PCT/EP2021/080402
§ 371(c)(1), (2) Date May 26, 2023,
PCT Pub. No. WO2022/111952, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 10 2020 007 243.7 (DE), filed on Nov. 27, 2020.
Prior Publication US 2024/0027509 A1, Jan. 25, 2024
Int. Cl. G01R 31/00 (2006.01); G01R 27/02 (2006.01); B60R 16/02 (2006.01)
CPC G01R 31/007 (2013.01) [G01R 27/025 (2013.01); B60R 16/0207 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for determining a current capacitance value (38) of a Y capacitance (34, 36) of an electrical wiring system (12) for an at least partially electrically operated motor vehicle (10) by an electronic computing device (14), wherein a high-voltage energy store (16) of the electrical wiring system (12) is electrically coupled with an energy store-external part (30) by a switching device (40) of the electrical wiring system (12), comprising the steps of:
in an energy store-internal part (18) of the electrical wiring system (12), determining a first insulation resistance (42) on a basis of a capacitance value (48) of the electrical wiring system (12) by a first insulation monitor (20);
determining a second insulation resistance (44) of the electrical wiring system (12) by a second insulation monitor (28) of the energy store-external part (30);
comparing the first insulation resistance (42) with the second insulation resistance (44) by the electronic computing device (14); and
on a basis of the comparing, adjusting the capacitance value (48) for determining the first insulation resistance (42) by the first insulation monitor (20) such that the first insulation resistance (42) matches the second insulation resistance (44).