US 12,384,449 B2
Method for operating an electromechanical steering assistance device of a vehicle
Christian Koelbl, Munich (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 18/269,997
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Dec. 7, 2021, PCT No. PCT/EP2021/084525
§ 371(c)(1), (2) Date Jun. 28, 2023,
PCT Pub. No. WO2022/156950, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 10 2021 101 238.4 (DE), filed on Jan. 21, 2021.
Prior Publication US 2024/0067259 A1, Feb. 29, 2024
Int. Cl. B62D 5/04 (2006.01)
CPC B62D 5/0463 (2013.01) 7 Claims
OG exemplary drawing
 
1. A method for operating an electromechanical steering assistance device of a vehicle, the method comprising:
operating the steering assistance device via an accumulator, which is charged by an electric motor operating in generator mode;
establishing, in a predictive manner, that the steering assistance device, at a future time point, will have a power demand which is higher than power which is currently requested for charging the accumulator;
further to said establishment of a future time point, applying a higher voltage to the accumulator, such that the steering assistance device, at the predicted time point delivers the predicted higher power, wherein
the higher voltage is only applied to the accumulator in an event that it is determined, by prediction, that a design limit of the steering assistance device at the future time point will be reached or exceeded,
the design limit of the steering assistance device is dictated by a steering angle speed characteristic curve and by a manual torque characteristic curve for a manual torque which is applied by a vehicle occupant to a steering handle,
the steering angle speed characteristic curve dictates a limiting steering angle speed of at least one vehicle wheel of the vehicle, according to a steering rack stroke of a steering device of the vehicle,
the manual torque characteristic curve dictates a limiting manual torque applied by a vehicle occupant for operating the steering handle of the vehicle, according to a steering rack stroke, and
the higher voltage is only applied to the accumulator in the event that it is determined that both the steering angle speed characteristic curve and the manual torque characteristic curve of the steering assistance device at the future time point will be achieved and/or exceeded.