Gradient Change Detection for Stable Vehicle HUD Image Correction
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Solution Overview
Problem
Existing systems for displaying virtual images in vehicles, such as head-up displays, face challenges in accurately correcting the display position due to gradient changes in the traveling path, leading to erroneous corrections and inappropriate display of virtual images.
Innovation Solution
A gradient change detection system that includes a posture detection unit to measure posture changes and a gradient change detector to determine if these changes are due to gradient changes in the traveling path. This system adjusts the correction amount for the display position based on the detection results, ensuring accurate positioning of virtual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display position is corrected based on posture change amount detected by gyro sensor, then position displacement of virtual image is reduced during vehicle acceleration and deceleration, but erroneous corrections occur when posture change is caused by gradient change of traveling path
Solution Approach 1:
A gradient change detector is introduced as an intermediary component that analyzes posture change data to determine whether it originates from gradient changes or vehicle motion. This mediator filters out gradient-induced posture changes before they reach the display position correction mechanism, preventing erroneous corrections while maintaining accurate positioning during legitimate vehicle movements
Solution Approach 2:
The system implements a feedback mechanism where the gradient change detector continuously monitors posture change amounts and provides feedback to the display position correction unit. When gradient change is detected, the system adjusts or suspends correction operations, creating a closed-loop control system that adapts to changing road conditions and prevents incorrect display positioning
2Speed
If posture detection is continuously performed to enable real-time display correction, then display position can be adjusted during vehicle movement, but computational load increases to distinguish gradient changes from vehicle motion
Solution Approach 1:
The system changes the parameter being monitored from raw posture change amount to a derived parameter: the variation amount of posture change amount over time. This transformation enables the system to distinguish between transient posture changes (vehicle motion) and sustained posture changes (gradient changes) without requiring complex sensor arrays or computational algorithms
Solution Approach 2:
Rather than implementing a fully complex classification system to distinguish all types of vehicle motion from gradient changes, the system applies partial action by focusing only on detecting gradient changes through the variation amount metric. This simplified approach provides sufficient discrimination capability without the full complexity of comprehensive motion analysis
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
The system effectively reduces erroneous corrections caused by gradient changes in the traveling path, ensuring that virtual images are appropriately displayed and reducing visual discomfort for the vehicle occupants.
Implementation Method 1
when the vehicle enters an inclined traveling path such as a slope, the gyro sensor detects a posture change of the vehicle due to a gradient change of the traveling path
Data Source
AI summary
A gradient change detection system for a moving body for detecting a change in a gradient of a traveling path, the gradient change detection system includes a posture detection unit that detects a posture change amount in a rotation direction about a left-right direction with respect to a traveling direction of a moving body, and a gradient change detector that detects a change in a gradient of the traveling path based on the posture change amount or a variation amount in predetermined unit time of the posture change amount.