HUD Speed Difference Indicator for Cruise Control Feedback
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Solution Overview
Problem
Drivers face challenges in maintaining target vehicle speeds, especially when using cruise control, as they often fail to notice speed differences between their vehicle and the vehicle ahead, leading to potential speeding or slowing issues due to limited visual feedback.
Innovation Solution
A head-up display (HUD) system that projects a virtual image onto the windshield, displaying a visual indicator of the speed difference between the vehicle's current speed and a target speed, which can be adjusted based on various factors like speed limits, fuel efficiency, weather, and road conditions, and is dynamically adjusted in length, color, and position to reflect the magnitude and direction of the speed difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a driver relies on traditional visual observation through windows and windshields to monitor vehicle speed, then the driver maintains a natural viewing experience, but the driver cannot easily notice speed differences between the vehicle and the vehicle ahead
Solution Approach 1:
The patent combines the speed difference indicator with the existing HUD system that displays other vehicle information. The indicator is integrated into the same display architecture, merging multiple functions (speed display, navigation, and speed difference feedback) into a unified system, thereby reducing overall system complexity while providing comprehensive information.
Solution Approach 2:
The patent introduces an intermediary processing layer that calculates speed differences by comparing data from multiple sensors (vehicle speed sensor, GPS, and potentially external vehicle detection). This intermediary module processes raw data and presents synthesized speed difference information to the driver, making complex sensor data understandable without requiring direct observation of raw sensor inputs.
2Loss of information
If the HUD system displays detailed speed difference information, then the driver receives comprehensive feedback, but the driver may experience increased cognitive load and distraction
Solution Approach 1:
The patent segments the speed difference indicator into distinct visual components: a directional arrow indicating whether to accelerate or decelerate, and a numerical value showing the magnitude of speed difference. This segmentation allows the driver to quickly grasp the essential information (direction and amount) without processing complex data representations, reducing cognitive load while maintaining information clarity.
Solution Approach 2:
The patent employs color changes to encode speed difference information intuitively. For example, green indicates the vehicle is below target speed (accelerate), red indicates above target speed (decelerate), and yellow indicates approaching the target speed. These color cues provide immediate, instinctive feedback that reduces the mental effort required to interpret speed information.
3Reliability
If the visual indicator is always displayed, then the driver continuously receives speed feedback, but the driver may be distracted when not needing speed information
Solution Approach 1:
The patent implements dynamic display characteristics where the visual indicator's properties change based on driving conditions. The indicator adjusts its size, brightness, or position based on the magnitude of speed difference, and may be temporarily suppressed when the vehicle is already at the target speed or when external conditions (weather, traffic) make continuous display inappropriate. This dynamic behavior maintains reliability by providing feedback when needed while reducing distraction when not needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the driver's ability to maintain the target speed by providing clear, intuitive visual feedback, reducing the likelihood of speeding or slowing errors and improving overall driving efficiency and safety.
Implementation Method 1
a light source configured to, via a windshield of the vehicle, generate a virtual display that is visible within a passenger cabin of the vehicle
Data Source
AI summary
A head up display (HUD) system includes: a difference module configured to determine a speed difference based on a difference between (a) a present speed of a vehicle and (b) a target speed of the vehicle; a light source configured to, via a windshield of the vehicle, generate a virtual display that is visible within a passenger cabin of the vehicle; and a display control module configured to control the light source to include a visual indicator of the speed difference in the virtual display.