Motor Driven Power Steering Control for Smart Parking Assistant Systems
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Solution Overview
Problem
The motor driven power steering apparatus in smart parking assistant systems (SPAS) faces damage and excessive vibration when an excessive required steering angle is inputted, leading to potential malfunction during automatic parking.
Innovation Solution
A cooperative control apparatus that calculates a target steering angular speed, sets a limit value to reduce excessive responses, and converts this speed into a motor angular speed to control the motor driven power steering, preventing damage and reducing vibration through precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor driven power steering apparatus responds to an excessive required steering angle from the SPAS, then the automatic parking function is achieved, but the motor driven power steering apparatus suffers damage due to excessive response
Solution Approach 1:
The control apparatus changes the parameter of steering angular speed by comparing the required steering angle with a predetermined threshold value. When the required steering angle exceeds the threshold, the system limits the target steering angular speed to a maximum value, thereby preventing excessive response that would damage the motor driven power steering apparatus while still enabling automatic parking functionality.
2Speed
If the motor driven power steering apparatus rapidly varies by external input from the SPAS, then the parking maneuver is executed quickly, but the driver feels vibration and sense of difference
Solution Approach 1:
The control apparatus adjusts the target steering angular speed parameter based on the required steering angle. When the required steering angle is large, the system caps the target steering angular speed at a predetermined maximum value, preventing rapid variations that cause vibration and driver discomfort while still maintaining adequate parking maneuver speed.
Data Source
AI summary
The present invention relates to a cooperative control apparatus of a motor driven power steering apparatus for a smart parking assistant system (SPAS). The cooperative control apparatus may relieve excessive response of the motor driven power steering apparatus even through an excessive required steering angle is inputted from the SPAS, prevent damage of the motor driven power steering apparatus by controlling the motor driven power steering apparatus through a motor angular speed, reduce vibration, and improve steering performance with high control precision regardless of external disturbance.