MDPS Steering Angle Centering Control Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drivers experience inconvenience when attempting to center align the steering wheel after parking a vehicle equipped with motor-driven power steering (MDPS), increasing the likelihood of vehicle collisions due to lack of alignment.
Innovation Solution
A method for generating a request command for a wheel alignment apparatus using MDPS, which detects the steering angle and generates a request command to align the wheel with the center by setting an initial value, dividing the control period into angular velocity acceleration, constant, and deceleration periods, and creating a request profile to achieve precise center alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual center alignment is performed after parking, then the steering wheel can be aligned, but the process is inconvenient and time-consuming for the driver
Solution Approach 1:
The system enables self-service center alignment by automatically detecting the steering angle through the steering angle sensor and controlling the MDPS motor to rotate the steering wheel to the center position without requiring manual driver intervention. The ECU autonomously determines when alignment is needed and executes the centering operation.
Solution Approach 2:
The system performs preliminary action by automatically centering the steering wheel before the driver needs to operate the vehicle. The center alignment is executed during the parking phase or before vehicle operation begins, ensuring the steering wheel is properly positioned in advance, thereby preventing potential collisions and eliminating the need for manual adjustment.
2Reliability
If the steering wheel is not center aligned after parking, then the vehicle structure remains unchanged, but the risk of vehicle collision increases
Solution Approach 1:
The system autonomously monitors steering angle and automatically executes center alignment operations without requiring driver awareness or action. The ECU continuously monitors the steering state and initiates centering when necessary, making the safety function operate independently of driver behavior.
Solution Approach 2:
The system employs feedback through the steering angle sensor that continuously monitors the steering wheel position. This feedback information is processed by the ECU to determine whether center alignment is needed, and the system adjusts the steering angle accordingly, creating a closed-loop control system that ensures proper alignment for safety.
3Measurement precision
If a simple alignment method is used, then the operation is simple, but the precision of wheel alignment with center is insufficient
Solution Approach 1:
The system uses feedback from the steering angle sensor to continuously monitor the actual steering angle and compare it with the target center position. The ECU processes this feedback information and adjusts the MDPS motor control accordingly, enabling precise alignment through closed-loop control rather than simple open-loop operation.
Solution Approach 2:
The system achieves precise alignment by dynamically adjusting control parameters including steering angle thresholds, angular velocity limits, and acceleration/deceleration rates. The ECU modifies these parameters based on real-time steering angle feedback to ensure accurate center positioning while managing the complexity through parameter optimization rather than hardware complexity.
Data Source
AI summary
The present invention relates to a method for generating a request command of a wheel alignment apparatus using a motor-drive power steering (MDPS). After a vehicle having the MDPS mounted therein is parked, a steering angle is detected, and an MDPS motor is controlled through a request command of a motor angular velocity to align a wheel with the center. Accordingly, the motor angular velocity of the motor which is actually driven may be controlled to improve the precision of motor control, regardless of external disturbance such as tire frictions or loads.