US 9,809,247 B2
Motor control current sensor loss of assist mitigation for electric power steering
Julie A. Kleinau, Bay City, MI (US); Prerit Pramod, Saginaw, MI (US); Dennis B. Skellenger, Saginaw, MI (US); and Selva Kumar Sengottaiyan, Saginaw, MI (US)
Assigned to STEERING SOLUTIONS IP HOLDING CORPORATION, Saginaw, MI (US)
Filed by Steering Solutions IP Holding Corporation, Saginaw, MI (US)
Filed on Jan. 26, 2016, as Appl. No. 15/6,901.
Claims priority of provisional application 62/109,698, filed on Jan. 3, 2015.
Prior Publication US 2016/0229449 A1, Aug. 11, 2016
Int. Cl. B62D 5/04 (2006.01); H02P 23/00 (2016.01)
CPC B62D 5/0484 (2013.01) [B62D 5/049 (2013.01); B62D 5/0463 (2013.01); H02P 23/0004 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power steering system comprising:
a torque modifier module that generates a modified torque command in response to a current sensor fault, a magnitude of the modified torque command changes over a time period; and
a feedforward selection module that applies a dynamic feedforward compensation to a motor current command, the dynamic feedforward compensation based on motor inductance and motor-circuit resistance, thereby generating a motor voltage that is applied to a motor of the power steering system, the dynamic feedforward compensation modifies a frequency response of the power steering system, the motor current command is based on the modified torque command.