Lane-Aware Curve Speed Control for Driver Comfort
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle speed controllers do not adequately account for varying curvature limitations in different lanes of a curved road section, leading to uncomfortable vehicle motion for drivers, particularly when transitioning between passing and travel lanes.
Innovation Solution
A vehicle speed controller that detects the current lane and adjusts the reference speed based on lane type (fast or slow) and curvature, ensuring the vehicle speed does not exceed a set reference speed at the curve entry point, using sensors and map data to determine lane type and curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle speed is reduced to a curve entry speed based on the curvature of the road, then the vehicle can travel through the curve safely, but the driver may feel uncomfortable when traveling on a passing lane
Solution Approach 1:
The patent applies local quality by differentiating speed control based on lane type. The controller determines whether the current lane is a passing lane or a travel lane and sets different reference speeds accordingly. For passing lanes, a higher reference speed is allowed compared to travel lanes, enabling the vehicle to maintain more appropriate speeds for each specific lane context while still ensuring safe curve traversal.
Solution Approach 2:
The patent implements dynamics by making the reference speed adjustable based on lane determination. The controller dynamically modifies the reference speed parameter according to the detected lane type (passing or travel lane), allowing the speed control system to adapt its behavior to the specific driving context rather than applying a fixed speed reduction for all lanes.
2Reliability
If the vehicle speed is limited based on road curvature, then the vehicle can follow the curve, but the degree of limitation may be excessive for passing lanes
Solution Approach 1:
The patent applies local quality by implementing lane-specific speed limitations. The controller determines the current lane type and applies different reference speed values: a first reference speed for passing lanes and a second reference speed for travel lanes. This allows the system to impose less restrictive speed limitations on passing lanes where the curvature impact is less severe, while maintaining stricter limitations on travel lanes.
Solution Approach 2:
The patent implements parameter changes by modifying the reference speed parameter based on lane determination. The controller changes the reference speed value according to whether the vehicle is in a passing lane or travel lane, enabling flexible adjustment of speed limitation parameters to match the actual curvature impact on each lane type.
Data Source
AI summary
A vehicle speed controller includes a processor configured to detect a current lane in which a vehicle is traveling, detect a start point at which a curved road section starts within a predetermined distance ahead of the vehicle, estimate the curvature of the current lane in the road section, determine whether the current lane is a fast lane or a slow lane, set a reference speed of the vehicle so that the reference speed decreases as the curvature of the current lane increases and that the reference speed is greater when the current lane is the fast lane than when the current lane is the slow lane, and control the speed of the vehicle so that the speed of the vehicle at the start point of the road section will not be greater than the reference speed.