Head-Up Display Attitude Angle Calculation Using Acceleration Data Filtering
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Solution Overview
Problem
The acceleration of a vehicle fluctuates significantly due to disturbances during driving, making it difficult to accurately calculate the attitude angle and correct the display position of information in head-up display systems.
Innovation Solution
An image display system that includes an attitude angle calculation section, which uses time-series data of acceleration detection values to calculate the attitude angle by excluding data from periods where the acceleration components' ratio falls outside a predetermined range, and a display control section to adjust the image projection accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration detection values are used to calculate the attitude angle, then the display position can be corrected according to vehicle orientation, but the calculation accuracy deteriorates due to significant acceleration fluctuations from disturbances during driving
Solution Approach 1:
The patent extracts and removes acceleration detection values that fall outside the predetermined range from the time-series data before calculating the attitude angle. By excluding these outlier values that represent disturbance periods, the calculation uses only reliable acceleration data within the normal range, thereby improving attitude angle accuracy without compromising the overall reliability of display position correction
Solution Approach 2:
The patent implements a feedback mechanism where the calculated attitude angle is continuously used to adjust the display position, and this corrected display position feedback improves the overall system reliability. The system monitors the relationship between acceleration values and display positioning to ensure accurate presentation of information
2Quantity of substance
If all acceleration detection values in the time-series data are used for calculation, then more data is available for computation, but the calculation accuracy deteriorates due to inclusion of disturbed data points
Solution Approach 1:
The patent extracts only the useful portion of the acceleration data by removing values outside the predetermined range. This selective extraction maintains a sufficient quantity of valid data points for accurate statistical calculation of the attitude angle while eliminating noisy disturbance data that would degrade precision
Solution Approach 2:
The patent applies different quality standards to different portions of the acceleration data. Values within the predetermined range are considered high-quality data suitable for calculation, while values outside the range are treated as low-quality disturbed data. This local quality differentiation ensures that only reliable data contributes to the attitude angle computation
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
This approach allows for more accurate calculation and correction of the attitude angle, ensuring that the displayed information is properly aligned with the vehicle's orientation, even under varying conditions.
Implementation Method 1
an acceleration sensor that detects acceleration of the moving body
Implementation Method 2
an angular velocity sensor that detects angular velocity of the moving body
Implementation Method 3
an image projection part configured to display an image by projecting the image to a display object
Data Source
AI summary
An image display system includes: an image projection unit that projects and displays an image on a display target for a moving body; a posture angle calculation unit that calculates a posture angle for the moving body on the basis of chronological data for acceleration detection values for the acceleration of the moving body in a prescribed time period; and a display control unit that controls the display position at which the image is projected and displayed on the display target, in accordance with the posture angle calculated by the posture angle calculation unit. The acceleration detection values include bi-directional components. The posture angle calculation unit excludes acceleration detection values from the chronological data used when calculating the posture angle, said acceleration detection values being included in an exclusion time period which has a ratio for the bidirectional components, in the prescribed time period, that is outside a prescribed range.