ACC Display Graphics for Intuitive Inter-Vehicle Time Awareness
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Solution Overview
Problem
Users may feel anxious about whether adaptive cruise control (ACC) systems, specifically inter-vehicle time control ACC, are operating normally due to changes in displayed inter-vehicle distance with existing bar graph representations.
Innovation Solution
A vehicle display control device and method that acquires vehicle speed and inter-vehicle distance, displaying inter-vehicle information using icons and graphic groups on a display, where the number and size of graphics intuitively represent inter-vehicle time and distance, ensuring users recognize the ACC's normal operation despite changes in vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a bar graph displaying inter-vehicle distance is used, then the inter-vehicle distance information is visually presented, but the user may feel anxious about whether the inter-vehicle time control ACC is operating normally due to changes in bar length with vehicle speed
Solution Approach 1:
The display is segmented into multiple indicator types: bar graph for inter-vehicle distance, numerical display for inter-vehicle time, and graphical icons representing time intervals. This segmentation allows each parameter to be displayed independently, preventing confusion between distance and time changes
Solution Approach 2:
A numerical display showing the actual inter-vehicle time value is introduced as an intermediary between the bar graph and the user's understanding. This intermediary explicitly shows the time parameter, bridging the gap between distance-based visual representation and time-based control logic
2Measurement precision
If the bar graph length changes with inter-vehicle distance, then the distance information is accurately represented, but it creates confusion about whether the ACC system is operating correctly since the bar length should ideally reflect constant time intervals
Solution Approach 1:
Different colors are used to represent different types of information: the bar graph uses one color scheme for distance, while the numerical time display and graphical icons use another color scheme for time. This visual differentiation helps users distinguish between distance-based and time-based representations
Solution Approach 2:
The display adds a temporal dimension to the traditional distance-based bar graph by incorporating numerical time values and time-based graphical icons. This transforms the display from a single-dimensional distance representation to a multi-dimensional representation that includes both distance and time
Data Source
AI summary
A vehicle display control device includes: a processor configured to: acquire a vehicle speed of a subject vehicle, an inter-vehicle distance to another vehicle traveling in front of the subject vehicle in a traveling direction, and at least one of a specified value or a detected value of an inter-vehicle time required for the subject vehicle to reach a position at which the other vehicle is present; and display inter-vehicle information indicating the specified value or the detected value of the inter-vehicle time and the inter-vehicle distance at a position corresponding to a forward side of the subject vehicle represented by a first icon in the traveling direction on a display equipped in the subject vehicle.