Motor control current sensor loss of assist mitigation for electric power steering
AssigneeSteering Solutions IP Holding Corporation
InventorsJulie A. Kleinau, Prerit Pramod, Dennis B. Skellenger, Selva Kumar Sengottaiyan
Life of this patent
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Abstract
A power steering system includes 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. The power steering system also includes a feedforward selection module that applies a dynamic feedforward compensation to a motor current command, 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.
Claims19
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.
A power steering system comprising:
- a stability compensator selector module that selects a stability compensator of a steering torque control loop of the power steering system when a current sensor fault is detected, the stability compensator generates a compensated torque command based on frequency response of a motor control system of a motor of the power steering system;
- and
- a torque modifier module that generates a modified torque command from the compensated torque command in response to a current sensor fault, a magnitude of the modified torque command changes over a time period, a motor voltage that is applied to the motor of the power steering system is based on the modified torque command.
A method for controlling a power steering system comprising:
- generating a modified torque command in response to a current sensor fault, a magnitude of the modified torque command changes over a time period;
- and
- applying 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.
Dependencies are inferred from the claim text.