Steering Control Method for Smooth Driver Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automatic steering systems in motor vehicles experience discontinuity and potentially dangerous steering wheel dynamics when a driver opposes the automatic control function, leading to unpleasant and unsafe high-speed returns when the wheel is released.
Innovation Solution
A control method that calculates a setpoint steering wheel speed and additional torque to regulate the steering wheel speed, using a proportional/derivative regulation system to limit the steering wheel's speed and ensure smooth return to the set position, thereby reducing the angular difference and ensuring comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the motorization generates greater torque to reduce the angular difference between actual and setpoint steering wheel positions, then the positioning accuracy is improved, but the steering wheel speed becomes excessively high when the driver releases the wheel, causing discomfort and safety issues
Solution Approach 1:
The control method dynamically adjusts the setpoint steering wheel speed based on the actual steering wheel speed and angular difference. When the driver opposes the automatic control, the system detects the increasing angular difference and limits the setpoint speed to prevent excessive steering wheel movement, thereby resolving the contradiction between positioning accuracy and speed control
Solution Approach 2:
The system continuously monitors the actual steering wheel position and speed, compares them with the setpoint values, and adjusts the motorization torque and setpoint speed accordingly. This feedback mechanism ensures that positioning accuracy is maintained while preventing dangerous steering wheel speeds when the driver releases the wheel
2Extent of automation
If the servo-control system increases torque to achieve the calculated steering column position, then the automatic control function's positioning capability is improved, but the discontinuity between automatic regulation and driver intervention increases
Solution Approach 1:
The control method dynamically adjusts the setpoint steering wheel speed based on the actual speed and angular difference, creating a smooth transition between automatic control and driver intervention. This dynamic adjustment maintains control continuity while preserving automatic control capability
Solution Approach 2:
The system ensures continuous and smooth control by regulating the setpoint steering wheel speed to prevent discontinuities during driver intervention. The motorization torque is continuously adjusted to maintain seamless operation between automatic regulation and manual driver input
Data Source
Figure 1~2
AI summary
Checking method implemented by a function that automatically checks a steering system (1) of a motor vehicle comprising a steering wheel (4) to operate a powered system (20) that turns the wheels (10) under certain specific conditions of operation of this vehicle, this checking method calculating a reference steering wheel angle (Av cons) to provide torque control of the power system (20), characterized in that it additionally calculates a steering wheel rate of turn reference (Av cons) which is saturated at a predefined value (Avp target).