Adaptive Route Guidance Adjusting Lane Change Timing for Position Uncertainty
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Solution Overview
Problem
Conventional navigation devices fail to provide accurate lane guidance to drivers when the position of the host vehicle is uncertain, leading to confusion at branch points.
Innovation Solution
A route guidance device that estimates the vehicle's position and lane accuracy, adjusting the guidance start point based on this accuracy, and instructs lane changes to the rightmost or leftmost lane when accuracy is low, ensuring the vehicle reaches the correct lane before a branch point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guidance point for urging the driver to change lanes is preset, then the driver can recognize the lane to travel, but accurate guidance cannot be provided when the position of the host vehicle is not estimated correctly
Solution Approach 1:
The patent applies dynamics by making the guidance system adaptive rather than static. The guidance point is dynamically adjusted based on the estimated position accuracy of the host vehicle. When position estimation accuracy is high, the guidance point is set closer to the branch point; when accuracy is low, the guidance point is set farther away, allowing earlier lane change instructions. This dynamic adjustment ensures reliable guidance across varying conditions.
Solution Approach 2:
The patent changes the parameter of guidance point distance based on the position estimation accuracy parameter. By varying the distance to the guidance point according to the accuracy level, the system optimizes guidance effectiveness. This parameter change allows the system to compensate for uncertain position estimates by providing earlier or later guidance as needed.
2Manufacturing precision
If the guidance point is set close to the branch point, then lane change timing is precise, but the driver cannot react in time when position uncertainty is high
Solution Approach 1:
The patent applies preliminary action by setting the guidance point at an appropriate distance before the branch point, allowing the driver sufficient time to react and execute the lane change maneuver. When position uncertainty is high, the guidance point is positioned farther away, providing earlier notice to the driver. This ensures the driver has adequate reaction time while still achieving timely lane changes.
3Ease of operation
If the guidance point is set far from the branch point, then the driver has sufficient reaction time, but the guidance becomes less precise for lane change timing
Solution Approach 1:
The system dynamically adjusts the guidance point distance based on position estimation accuracy and driver reaction capabilities. When position accuracy is low, the guidance point is set farther away to provide earlier warning and sufficient reaction time. When accuracy is high, the guidance point can be closer for more precise timing. This dynamic adjustment balances reaction time and timing accuracy.
Data Source
AI summary
A route guidance unit includes: a detection unit configured to detect a position of a host vehicle; a guide unit configured to provide guidance on a travel route when a distance from the position of the host vehicle detected by the detection unit to a branch point on the travel route reaches a predetermined distance; and an accuracy determination unit configured to determine a degree of accuracy of the position of the host vehicle, wherein, when the accuracy determination unit determines that the degree of accuracy of the position is a predetermined threshold or less, the guide unit provides the guidance on the travel route at a point before the distance from the position of the host vehicle to the branch point reaches the predetermined distance.