Control apparatus of motor driven power steering

摘要

A control apparatus of a motor-driven power steering (MDPS) includes: a torque sensor configured to measure a driver's steering torque inputted to a steering wheel and output a steering torque signal; a steering angle sensor configured to measure a steering angle of the steering wheel; a variable notch filter configured to reduce a torque ripple for the steering torque signal depending on a steering angle speed which is a change rate of the steering angle with respect to time; a vehicle speed sensor configured to measure vehicle speed; and a controller configured to receive the steering angle, the steering torque signal, and the vehicle speed from the steering angle sensor, the variable notch filter, and the vehicle sensor, respectively, and control drivability of a driving motor according to a driving speed of a vehicle.

主权项

1. A control apparatus of a motor-driven power steering (MDPS), the control apparatus comprising:
a torque sensor configured to measure steering torque applied to the steering wheel and to output a steering torque signal indicative of the steering torque; a steering angle sensor configured to measure a steering angle of the steering wheel and to output a steering angle signal indicative of the steering angle, wherein a steering angle speed is defined as a rate of the steering angle changes over time; a variable notch filter configured to receive and process the steering torque signal and to output a processed steering torque signal, wherein the variable notch filter is configured to reduce a torque ripple in the steering torque signal when the steering angle speed is equal to or higher than a predetermined reference value; a vehicle speed sensor configured to measure a vehicle speed and to output a vehicle speed signal indicative of the vehicle speed; and a controller configured to control the steering motor based on the steering angle signal, the processed steering torque signal, and the vehicle speed signal from the steering angle sensor, the variable notch filter, and the vehicle sensor, respectively.