Gradient Change Detection for Accurate Vehicle HUD Positioning

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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 image display.

Innovation Solution

A gradient change detection system that includes a posture detection unit and a gradient change detector, which detect posture changes and gradient changes in the traveling path. This system adjusts the correction amount for the display position based on the detected gradient changes, ensuring accurate image positioning.

Engineering Contradictions & Design Principles

VSEngineering 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 the vehicle enters inclined traveling paths such as slopes

Engineering Contradiction:

Improvedisplay position accuracyVSAvoiddisplay appropriateness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces an acceleration sensor as an intermediary device to detect gradient changes. The acceleration sensor measures actual acceleration along the traveling direction, which serves as a mediator to distinguish between posture changes caused by gradient changes versus those caused by vehicle dynamics. This intermediary measurement enables the system to accurately determine whether correction should be applied.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback by comparing the acceleration detected by the acceleration sensor with the posture change amount detected by the gyro sensor. This feedback mechanism allows the system to continuously monitor and adjust the correction amount based on the relationship between actual acceleration and detected posture changes, thereby eliminating erroneous corrections while maintaining accurate display positioning.

Inventive Principle:

Principle #23Feedback

2Stability of the object's composition

If correction amount is continuously adjusted based on posture changes, then virtual image remains stable during normal vehicle operation, but unnecessary position adjustments occur during gradient changes

Engineering Contradiction:

Improvevirtual image stabilityVSAvoiderroneous corrections

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful effect of gradient-induced posture changes into a beneficial detection signal. By using the acceleration sensor to detect gradient changes, the system identifies when posture changes are caused by gradient rather than vehicle dynamics. This allows the system to selectively disable corrections during gradient changes, transforming what was previously a source of erroneous corrections into an opportunity for more accurate display control.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If the system uses only gyro sensor for posture detection, then the device complexity is low, but the system cannot distinguish between posture changes due to vehicle dynamics and those due to gradient changes

Engineering Contradiction:

Improvedetection system complexityVSAvoidgradient change information

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The acceleration sensor serves multiple functions in the system. It not only detects gradient changes but also provides information about vehicle acceleration and deceleration. This multi-functionality allows the system to use a single sensor for multiple purposes, reducing the need for additional specialized sensors while still achieving the goal of distinguishing gradient-induced posture changes from dynamics-induced posture changes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 without unnecessary position adjustments.

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

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS20250124833A1Gradient change detection system, display system using same, and storage medium that stores program for moving body

Publication Date: 2025.04.17 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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.