Emergency steering apparatus and method of motor driven power steering system
AssigneeHyundai Mobis Co., Ltd.
InventorTae Hong Kim
Life of this patent
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Abstract
An emergency steering apparatus of an MDPS (Motor Driven Power Steering) system may include: a steering angle sensor configured to sense a steering angle of a steering wheel; a vehicle speed sensor configured to sense a vehicle speed; an assist rack force detector configured to detect an assist rack force of the MDPS system using the steering angle sensed by the steering angle sensor and the vehicle speed sensed by the vehicle speed sensor; and a command current detector configured to detect a command current of a motor using the assist rack force detected by the assist rack force detector
Claims20
An emergency steering apparatus of an MDPS (Motor Driven Power Steering) system, comprising:
- a steering angle sensor configured to sense a steering angle of a steering wheel;
- a vehicle speed sensor configured to sense a vehicle speed;
- an assist rack force detector configured to detect an assist rack force of the MDPS system using the steering angle sensed by the steering angle sensor and the vehicle speed sensed by the vehicle speed sensor, the assist rack force detector comprising an assist rack force calculator configured to calculate an assist rack force based on a total rack force and a driver max steering force by subtracting the driver max steering force from the total rack force, wherein the total rack force is calculated based on a self-aligning torque, wherein the driver max steering force is calculated by the assist rack force calculator using pinion efficiency, driver maximum torque, and pinion gear ratio;
- and
- a command current detector configured to detect a command current of a motor using the assist rack force detected by the assist rack force detector.
An emergency steering method of an MDPS system, comprising:
- calculating, by an assist rack force detector, a total rack force required for a driver to operate a steering wheel, using a steering angle and vehicle speed which are sensed by a steering angle sensor and a vehicle speed sensor, respectively, and calculating an assist rack force based on the calculated total rack force and a driver max steering force by subtracting the driver max steering force from the total rack force, wherein the total rack force is calculated based on a self-aligning torque, wherein the driver max steering force is calculated by an assist rack force calculator using pinion efficiency, driver maximum torque, and pinion gear ratio;
- and
- detecting, by a command current detector, a command current of a motor using the assist rack force detected by the assist rack force detector.
Dependencies are inferred from the claim text.