Patent ID: 11939010
Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 16:
17. A vehicle steering system, comprising:
a first steering mechanism configured to control a position of a first steering rack;
a second steering mechanism configured to control a position of a second steering rack based on a current position of the first steering rack;
a processor; and
a memory including instructions that, when executed by the processor, cause the processor to:
in response to a determination that a fault occurred in the second steering mechanism, identify a fault type associated with the fault;
determine whether a position of the second steering rack is controllable based on the fault type;
in response to a determination that the position of the second steering rack is controllable:
selectively position the second steering rack to a center position using a rack position controller and a zero target position command; and
hold, using a motor control system of the second steering mechanism, the second steering rack in the center position; and

in response to a determination that the position of the second steering rack is not controllable, disable the rack position controller by shorting, via an inverter, one or more phases of a motor associated with the rear steering mechanism to ground to hold, using the motor control system of the second steering mechanism, the second steering rack in a current position, wherein the current position includes a position of the second steering rack associated with the fault and wherein holding the second steering rack in the current position incudes not moving the second steering rack out of the current position.