US 12,454,312 B1
Systems and methods for holding a steering wheel in a steer by wire system
Raed Nasim Abuaita, Fenton, MI (US); and Brian K. Saylor, South Lyon, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Jun. 18, 2024, as Appl. No. 18/746,892.
Int. Cl. B62D 6/00 (2006.01); B62D 5/00 (2006.01)
CPC B62D 6/008 (2013.01) [B62D 5/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A steer by wire system including a steering wheel holding system comprising:
a steering wheel;
a emulator motor electrically coupled to the steering wheel, the emulator motor comprising a plurality of phases;
an emulator switching system configured to electrically couple each of the plurality of phases of the emulator motor to one of a power source and ground; and
an emulator controller electrically coupled to the emulator motor and the emulator switching system, the emulator controller being configured to:
receive vehicle data from at least one vehicle system of a vehicle;
determine whether the vehicle is in one of a driving mode and a non-driving mode based on the vehicle data;
upon a determination that the vehicle is in the driving mode, transmit a first command to the emulator switching system to electrically couple each of the plurality of phases of the emulator motor to the power source to place the steering wheel in an un-hold mode to enable the emulator motor to implement steer by wire operations; and
upon a determination that the vehicle is in the non-driving mode, transmit a second command to the emulator switching system to electrically couple each of the plurality of phases of the emulator motor to ground to short the plurality of phases of the emulator motor to ground resulting in the emulator motor generating a resistive torque to resist rotational movement of the steering wheel placing the steering wheel in a hold mode.