Lane Change Guidance Timing for Merging Lanes
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Solution Overview
Problem
Conventional driving assistance systems fail to notify occupants of lane change guidance at appropriate timings based on road shapes and vehicle travel situations.
Innovation Solution
An information output device and method that includes a route acquirer, output controller, and recognizer to provide guidance information for lane changes when specific distance and curvature conditions are met, ensuring timely notification before merging with a road, using a combination of display, sound, and vibration outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guidance information is provided based on conventional timing calculation (no-lane-change zone or number of lanes), then the system structure is simple, but the guidance timing is not appropriate for complex road shapes and travel situations
Solution Approach 1:
The system calculates the distance from the merging point to the branch point in advance and uses this pre-calculated distance to determine guidance timing. This preliminary calculation enables appropriate timing determination without complex real-time analysis during vehicle operation.
Solution Approach 2:
The system changes the parameter basis for timing determination from simple geometric parameters (no-lane-change zone, number of lanes) to a composite parameter considering road shape characteristics (distance from merging point to branch point, curvature). This parameter change improves timing accuracy for complex road configurations.
2Loss of time
If guidance information is provided before vehicle joins the first road when distance conditions are met, then guidance timing becomes more appropriate, but the control logic becomes more complex
Solution Approach 1:
The system uses curvature radius as an additional parameter to determine whether to provide guidance before merging. When the curvature radius is below a threshold, the system determines that the merging lane has significant curvature and provides guidance earlier, optimizing timing based on the specific road geometry.
Solution Approach 2:
The system pre-calculates distances and curvature characteristics of the road geometry before providing guidance. This preliminary analysis of road parameters enables the control logic to make accurate timing decisions without requiring complex real-time computations during vehicle operation.
3Reliability
If the system considers road shape and travel situation for guidance timing, then guidance appropriateness is improved, but information processing requirements increase
Solution Approach 1:
The system extracts only the essential parameters needed for timing determination from the complete road and vehicle data: distance from merging point to branch point and curvature radius of the merging lane. By extracting only these critical parameters, the system achieves accurate timing without processing unnecessary information.
Solution Approach 2:
The system applies different processing depths to different data elements: detailed geometric analysis for road shape parameters (distance and curvature) while using simpler parameters for vehicle travel situation. This localized quality approach optimizes information processing by applying appropriate analysis depth to each parameter type.
Data Source
AI summary
An information output device includes a route acquirer configured to acquire a route to a destination of a vehicle, an output configured to output information, and an output controller configured to cause the output to output guidance information for guiding an occupant to make a lane change to a recommended lane associated with the route to the destination acquired by the route acquirer. When a travel lane of the vehicle is a merging lane that merges with a first road and a distance from a point at which the travel lane merges with the first road to a point at which the lane change is required is less than or equal to a first prescribed distance, the output controller causes the output to output the guidance information before the vehicle joins the first road.