Windshield HUD Route Guidance With Direction Error Correction
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Solution Overview
Problem
Conventional display systems for vehicles, such as head-up displays, face accuracy issues when guiding vehicles through lane changes, crank-shaped roads, and approaching curve exits, as the direction of the display image deviates from the intended route direction.
Innovation Solution
A display system that estimates the vehicle's direction and adjusts the display image based on a threshold angle, correcting the direction when the difference between the route direction and vehicle direction exceeds a threshold, using a dead zone angle that varies with road conditions and navigation map accuracy, to ensure accurate guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display image direction is always aligned with the route direction without correction, then the display is simple and responsive, but the accuracy deteriorates when the vehicle direction deviates significantly from the route direction
Solution Approach 1:
The system continuously monitors the difference angle between the vehicle direction and route direction, and automatically adjusts the display image direction based on this feedback. When the difference angle exceeds the threshold, the display image direction is corrected by adding the difference angle to the route direction, ensuring accuracy while maintaining simple control logic through conditional feedback mechanisms.
Solution Approach 2:
The system changes the display parameter (display image direction) based on the threshold parameter. When the difference angle exceeds the threshold value, the display image direction parameter is adjusted from the route direction to a corrected direction, allowing the system to adapt to different driving conditions while maintaining operational simplicity.
2Measurement precision
If the display image direction is corrected whenever there is any difference from the route direction, then the accuracy is maximized, but excessive corrections occur due to minor route or vehicle direction errors
Solution Approach 1:
The system applies a preliminary anti-action by introducing a dead zone (threshold) that prevents corrections for minor deviations. This threshold acts as a buffer that counteracts the tendency to over-correct for small errors in route calculation or vehicle direction estimation, thereby improving reliability and display stability.
Solution Approach 2:
The threshold value serves as a cushioning mechanism that absorbs minor variations and errors before they trigger display corrections. By establishing this buffer zone in advance, the system prevents unnecessary adjustments and maintains display stability during normal driving conditions while still responding to significant directional deviations.
3Adaptability or versatility
If a fixed threshold is used for correction, then the control logic is simple, but it cannot adapt to different road conditions and navigation map accuracies
Solution Approach 1:
The threshold parameter is made dynamic rather than fixed, allowing it to vary based on driving conditions such as vehicle speed, road type, and navigation map accuracy. This dynamic adjustment enables the system to adapt to different scenarios (e.g., using larger thresholds at high speeds or on less accurate maps) while maintaining relatively simple control logic through predefined adjustment rules.
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 accuracy of the display image direction in challenging driving scenarios like lane changes, crank-shaped roads, and curve exits, while minimizing excessive corrections due to route or vehicle direction errors.
Implementation Method 1
a display that projects light representing the display image to a display medium of the vehicle, to display the display image as a virtual image through the display medium
Data Source
AI summary
A display system includes: a drawer that draws a display image for guiding a vehicle to a destination; a display that projects light representing the display image to a windshield of the vehicle, to display the display image as a virtual image through the windshield; and a vehicle direction estimator that estimates a direction of the vehicle. When a difference angle between a route direction at a current location of the vehicle on a route that is set for guiding the vehicle to the destination and the direction of the vehicle estimated is less than a threshold, the display displays the display image pointing in a first direction along the route as the virtual image. When the difference angle is greater than or equal to the threshold, the display displays the display image pointing in a second direction obtained by correcting the first direction as the virtual image.