Travel Route Calculation Device Avoiding Poor Feature Recognition
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Solution Overview
Problem
Existing route guidance systems for vehicles, particularly autonomous drive vehicles, face challenges in recognizing traffic signals and other features at intersections due to factors like road shape and position of signals, leading to difficulties in determining appropriate actions even when the risk of isolation is low.
Innovation Solution
A travel route calculation device that acquires object information affecting feature recognition, measures necessary recognition distance, determines recognition difficulty, and calculates routes to avoid locations where feature recognition is challenging, ensuring the vehicle can readily perceive necessary features for decision-making.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels through intersections with low isolation risk, then the travel route efficiency is improved, but the vehicle cannot recognize traffic signals and features due to road shape and signal positions
Solution Approach 1:
The system performs preliminary evaluation of feature recognizability at each intersection before the vehicle arrives. By calculating recognition difficulty in advance based on road shape, traffic signal positions, and other environmental factors, the system can identify problematic intersections ahead of time and select alternative routes, preventing recognition failures rather than reacting to them after they occur.
Solution Approach 2:
The system introduces an intermediary evaluation mechanism that assesses the recognizability of traffic signals and features at each intersection. This intermediary layer (the recognition difficulty evaluation unit) acts as a mediator between the route planning system and the actual vehicle navigation, filtering out intersections with poor recognition conditions and selecting only those with adequate feature visibility.
2Measurement precision
If the vehicle avoids locations with difficult feature recognition, then the feature recognition accuracy is improved, but the travel route may become longer or more complex
Solution Approach 1:
The system changes the parameter of route selection by introducing recognition difficulty as a new criterion alongside traditional factors like distance and traffic. By evaluating and comparing recognition difficulty parameters across multiple candidate routes, the system can balance between route efficiency and feature recognizability, selecting routes that optimize both travel time and recognition accuracy without excessive complexity.
3Reliability
If the system evaluates recognition difficulty at each intersection, then the feature recognition reliability is improved, but the calculation complexity and time increase
Solution Approach 1:
The system segments the route evaluation process by assessing recognition difficulty at discrete intersection points rather than continuously along the entire route. This segmentation allows the system to focus computational resources on critical decision points where feature recognition is most important, reducing overall calculation complexity while maintaining reliability at key locations.
Data Source
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AI summary
The travel route calculation device includes a travel route calculation unit configured to calculate a travel route for a subject vehicle to arrive at a destination, an information acquisition unit configured to acquire information on an object, which affects recognition of a feature by the subject vehicle, as object information, and a distance measurement unit configured to measure a distance from the subject vehicle to the feature as a necessary recognition distance. The necessary recognition distance is necessary for the subject vehicle to recognize the feature when deciding an action of the subject vehicle. The travel route calculation device further includes a determination unit configured to determine difficulty in recognizing the feature, on the basis of the object information and the necessary recognition distance. The travel route calculation unit calculates the travel route while avoiding a location at which recognition of the feature is determined to be difficult by the determination unit.