Vehicle Lateral Control Adaptation for Local Road Curvature
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Solution Overview
Problem
Vehicle control systems struggle to execute lateral position control on local roads without causing driver discomfort due to mismatches between intended and target lateral positions, often resulting in coupling with the driver's steering operation.
Innovation Solution
A vehicle control device that adjusts the target controlled variable for lateral position control to be smaller when on local roads, taking into account sharper curves and lower white line reliability, to reduce interference with the driver's steering and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lateral position control is executed on local roads with the same target controlled variable as motorways, then the control system maintains consistency, but driver discomfort increases due to mismatch between intended and target lateral positions
Solution Approach 1:
The patent applies local quality by setting different target controlled variable values for different road types. Specifically, when the vehicle is traveling on a local road, the target controlled variable is set to be smaller than when traveling on a motorway. This allows the control system to adapt to local road conditions (sharper curves, lower white line reliability) while maintaining control consistency through a unified control framework.
Solution Approach 2:
The patent changes the parameter of the target controlled variable based on road type detection. The electronic control device detects whether the vehicle is on a motorway or local road, and accordingly adjusts the target controlled variable parameter - using a smaller value for local roads and a larger value for motorways. This parameter adaptation resolves the contradiction between control consistency and driver comfort.
2Extent of automation
If lateral position control is executed on local roads, then the system provides continuous assistance, but coupling with driver steering operation occurs due to opposite directions
Solution Approach 1:
The patent changes the control parameter (target controlled variable) to be smaller on local roads, which reduces the magnitude of steering corrections applied by the system. This parameter adjustment allows continuous automation assistance while minimizing conflicts with driver steering operations, as the smaller corrections are less likely to oppose the driver's intended direction.
Solution Approach 2:
The patent makes the control system dynamic by adapting the target controlled variable based on real-time road type detection. The system transitions between different control modes (motorway mode with larger target variable, local road mode with smaller target variable), allowing the extent of automation to be adjusted dynamically to match driving conditions and reduce coupling with driver operations.
3Device complexity
If lateral position control uses standard target controlled variable on local roads, then the control algorithm remains simple, but white line recognition accuracy decreases due to sharper curves
Solution Approach 1:
The patent applies local quality by detecting road type (motorway vs. local road) and applying different target controlled variable settings accordingly. This simple detection-based approach maintains algorithm simplicity while improving white line recognition accuracy on local roads with sharper curves, as the smaller target controlled variable compensates for the reduced recognition accuracy.
Data Source
AI summary
A vehicle control device executes a lateral position control to control. In the lateral position control a lateral position of a vehicle in a travel area is controlled to maintain a predetermined target lateral position. An electronic control device of the vehicle control device controls, in the lateral position control, a controlled variable that is able to control the lateral position of the vehicle so as to match a target controlled variable acquired so that the lateral position maintains the target lateral position, controls the target controlled variable to be smaller than when the vehicle is traveling on a motorway, when the vehicle is traveling on a local road other than the motorway, and executes the lateral position control even when the vehicle is traveling on the local road.