MDPS Control Apparatus Steering Restoration Torque Feedback
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Solution Overview
Problem
Conventional Motor Driven Power Steering (MDPS) systems fail to provide a satisfactory steering sensation during the restoration section of steering wheel return to the on-center position, as they lack distinct control methods for steering and restoration sections.
Innovation Solution
A control apparatus and method that includes a basic MDPS logic device, a state determination device, a compensation logic device, and a motor control logic device to differentiate between steering and restoration states, determining an elasticity compensation value and target control value based on driver input and vehicle state information to enhance steering torque feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional MDPS control methods are used, then steering assistance is provided during steering sections, but steering sensation is unsatisfactory during restoration sections
Solution Approach 1:
The control method segments the steering operation into two distinct phases: steering section (when the driver rotates the steering wheel from the on-center position) and restoration section (when the steering wheel returns to the on-center position). Different control strategies are applied to each phase to optimize steering sensation for both operations.
Solution Approach 2:
The system dynamically adjusts the auxiliary steering torque based on the detected steering wheel state. When the steering wheel angle and angular velocity indicate restoration motion, the control apparatus switches to restoration-specific torque characteristics, providing appropriate feedback for the return motion.
2Ease of operation
If auxiliary steering torque is increased for steering assistance, then steering ease is improved, but steering feedback and sensation may be reduced
Solution Approach 1:
The control apparatus incorporates steering feedback by providing appropriate auxiliary steering torque characteristics during restoration sections. The system uses steering angle and angular velocity information to generate torque feedback that informs the driver of the steering wheel's return motion, maintaining situational awareness while providing assistance.
Solution Approach 2:
The system changes the torque parameter characteristics based on the operational phase. During steering sections, higher auxiliary torque is provided for ease of operation. During restoration sections, the torque characteristics are adjusted to provide appropriate feedback while maintaining assistance, optimizing both ease of operation and feedback information.
Data Source
AI summary
A control apparatus and a method of a motor driven power steering (MDPS) system are provided. The control apparatus includes: a predetermined MDPS logic device configured to determine and output a motor control value using driver steering input information and vehicle state information; a state determination device configured to determine whether a steering wheel is in a steering state or a restoration state based on the driver steering input information, and output steering wheel state information; a compensation logic device configured to determine an elasticity compensation value depending on the driver steering input information and the vehicle state information, and determine and output a target control value based on the motor control value, the elasticity compensation value and the steering wheel state information; and a motor control logic device configured to control a steering motor to generate an auxiliary steering torque depending on the target control value.