Lane Keeping System Asymmetric Control for Cornering Comfort
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Solution Overview
Problem
Existing Lane Keeping Support (LKS) systems intervene unpleasantly when drivers intentionally cut corners, as they are designed to guide vehicles to the center of the lane, leading to correcting steering interventions that drivers perceive as interfering.
Innovation Solution
The LKS system modifies its guiding behavior by introducing an asymmetrical control characteristic curve with a dead zone during cornering, applying no or minimal artificial steering forces when cutting corners, while maintaining alerting or guiding forces for deviations outside the curve, allowing drivers to cut corners without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LKS system applies steering forces to guide the vehicle to the center of the lane, then the vehicle positioning precision is improved, but the driver comfort deteriorates when cutting corners
Solution Approach 1:
The control characteristic curve is modified to be asymmetric during cornering. A dead zone is introduced on the inside of the curve (cutting corner direction) where no corrective torque is applied, while the outside of the curve maintains normal corrective torque. This asymmetric treatment allows drivers to cut corners comfortably without interference while still providing guidance when deviating outward from the lane
Solution Approach 2:
The control system applies different control characteristics to different regions of lane deviation. When the vehicle deviates toward the inside of a curve (cutting corner), the system applies a dead zone with no corrective force. When deviating toward the outside of the curve or from the lane center in straight sections, normal corrective torque is applied. This localized differentiation resolves the contradiction by being permissive where drivers intentionally cut corners but maintaining precision where lane keeping is needed
2Reliability
If the LKS system provides continuous steering correction, then the lane keeping reliability is improved, but the system complexity increases
Solution Approach 1:
The control characteristic curve is made dynamic rather than static. The system automatically adjusts the control characteristics based on driving conditions, particularly introducing a dead zone during cornering when deviation occurs toward the inside of the curve. This dynamic adaptation maintains lane keeping reliability in normal conditions while reducing unnecessary interventions during cornering, without requiring complex additional hardware
Data Source
AI summary
A device for keeping a vehicle in its lane, including a reference model, which obtains geometric data regarding the position of the vehicle in the lane as well as data relating to the course of the lane from a lane detection system, and from these calculates a setpoint variable for controlling the vehicle position. In order to allow for corners to be cut, the guiding behavior of the control system is modified in such a way when cornering that, in the event of a deviation of the path of motion of the vehicle from the setpoint path of motion in the direction of the inside of the curve, no or only low steering forces are applied to the steering system.