Vehicle Display Signaling for Autonomous Evacuation Status
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Solution Overview
Problem
Autonomous driving vehicles face challenges in communicating their evacuation actions to nearby vehicles and pedestrians, as the behavior differs from normal driving, making it difficult for others to predict their movement during failures.
Innovation Solution
A notification device with a display unit and controller that changes its display state, such as flickering or turning on/off, to indicate vehicle failures and evacuation status, using different cycles and patterns to convey distinct information about the vehicle's behavior during normal driving, failure, evacuation start, and completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the autonomous driving vehicle performs evacuation action when a failure occurs, then the vehicle can be moved to a safe location, but it becomes difficult for nearby vehicles and pedestrians to predict the vehicle's movement behavior
Solution Approach 1:
The notification device changes the display color or lighting state to indicate different vehicle states. For example, it displays a first color when normal driving is performed and a second color when evacuation action is performed, making the vehicle's behavior predictable to nearby vehicles and pedestrians.
Solution Approach 2:
The notification device uses periodic flickering or blinking patterns to convey different information. When evacuation action is performed, the display flickers at a different frequency or pattern compared to normal operation, creating a predictable visual signal that communicates the vehicle's intended movement.
2Loss of information
If the display unit is turned on or flickers when a failure occurs, then the outside of the vehicle is notified of the failure, but additional display changes are needed to distinguish evacuation action from normal failure notification
Solution Approach 1:
The notification device uses different flickering patterns to distinguish between failure notification and evacuation action. When evacuation is performed, the display flickers at a specific frequency or pattern that differs from the standard failure notification, allowing observers to differentiate between the two states without adding complex hardware.
Solution Approach 2:
The display unit changes color or lighting intensity to indicate evacuation action versus standard failure. This visual differentiation allows the system to convey multiple states using the same display hardware, avoiding the need for additional notification devices while reducing information loss.
3Loss of information
If the display unit uses different flickering rates to indicate evacuation start and completion, then the outside of the vehicle is notified of evacuation status changes, but the notification device must manage multiple display states and transitions
Solution Approach 1:
The notification device uses different flickering frequencies or patterns to indicate various evacuation statuses. For example, a first flickering rate indicates evacuation start while a second flickering rate indicates evacuation completion. This approach encodes multiple states in a single display unit through temporal variations, avoiding the need for multiple separate indicators.
Solution Approach 2:
The display controller changes temporal parameters of the flickering signal to convey different evacuation statuses. By varying the frequency, duration, or pattern of the flickering, the system can communicate multiple pieces of information (failure, evacuation start, evacuation completion) using the same hardware, managing complexity through software-controlled parameter variation.
Data Source
AI summary
A notification device provided in a vehicle including an autonomous driving system which causes the vehicle to travel by autonomous driving and to evacuate the vehicle when a failure occurs, includes a display unit configured to display information toward an outside of the vehicle, and a display controller configured to control the display unit. The display controller causes the display unit to be turned on or flicker when a failure occurs and changes a display of the display unit in at least one of a time when an evacuation starts and a time when an evacuation is completed.