Driver Guidance Display for Time- and Distance-Based Test Cycles
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Solution Overview
Problem
Current systems for guiding drivers during vehicle testing, such as exhaust emissions and electric vehicle range testing, lack effective visual aids to help drivers maintain target speeds based on both time and distance, leading to inefficiencies in test cycles.
Innovation Solution
An electronic display system that plots a target trace on a graph representing vehicle speed over time and distance, with visual indicators showing actual speed and distance deviations, allowing the driver to adjust their speed to minimize differences and adhere to test schedules by scrolling the trace at varying speeds based on elapsed time or distance traveled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the electronic display shows static target speed information, then the display simplicity is maintained, but the driver cannot effectively track speed changes over time and distance
Solution Approach 1:
The display system dynamically updates the target trace and visual indicators based on elapsed time and distance traveled. The target trace scrolls horizontally to reflect current test cycle progress, and the cursor moves vertically to show real-time speed deviations, transforming static information into dynamic feedback that adapts to the driver's needs throughout the test cycle.
Solution Approach 2:
The system provides continuous visual feedback by displaying the cursor position relative to the target trace, showing the driver their current speed deviation from the target. This feedback loop enables the driver to make real-time adjustments to maintain accurate speed control throughout the test cycle.
2Speed
If the target trace scrolls continuously at constant speed, then the display updates smoothly, but the scroll speed does not match the actual vehicle progress through the test cycle
Solution Approach 1:
The scroll speed of the target trace is dynamically adjusted based on the actual progress through the test cycle. During distance-based portions, the scroll speed varies to reflect the relationship between distance traveled and target speed, ensuring the visual representation accurately mirrors the physical test progression rather than using a fixed constant speed.
3Loss of information
If the display shows only current speed information, then the interface remains simple, but the driver lacks preview of upcoming speed changes
Solution Approach 1:
The display shows a portion of the target trace extending into the future, allowing the driver to anticipate upcoming speed changes and plan accordingly. This preview capability enables the driver to make proactive adjustments rather than reactive corrections, improving overall speed control during the test cycle.
Data Source
AI summary
A method for providing a visual aid to guide a driver when executing a test cycle includes controlling an electronic display to display a graph including a target trace indicating a target speed of a vehicle during the test cycle and a first visual indicator of an actual speed of the vehicle during the test cycle, scroll the target trace from a first side of the graph to a second side of the graph during a time-based portion of the test cycle to indicate the target vehicle speed with respect to an amount of time elapsed since a start of the test cycle, and scroll the target trace from the first side of the graph to the second side of the graph during a distance-based portion of the test cycle to indicate the target vehicle speed with respect to a distance travelled by the vehicle during the test cycle.