Dynamic Reversing Trajectory Template for Motor Vehicles
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Solution Overview
Problem
Current motor vehicle reversing systems with reversing cameras and display screens face challenges in storing dynamic templates due to their large file size, requiring significant memory and making it difficult to implement and update, especially in after-sales service, and are not adaptable to all vehicle types, particularly those with four-wheel steering.
Innovation Solution
A method and device that acquire the speed of the vehicle and number of steered wheels, calculating the dynamic template as a function of both the steering angle and speed, and applying calibration constants for longitudinal and transverse directions, while also accounting for camera distortion to display a dynamic template superimposed on reversing camera images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic templates are stored as image files in the computer memory, then the display system can show vehicle trajectory guidance, but the memory size becomes too voluminous to be practical for manufacturing and updates
Solution Approach 1:
The patent extracts only the essential geometric parameters (coordinates of points defining the template) from the complete image files. Instead of storing entire images, the system stores minimal data sets containing only the critical trajectory points, dramatically reducing memory requirements while preserving the functional ability to display accurate vehicle trajectory guidance.
Solution Approach 2:
Rather than storing complete images and displaying them directly, the system inverts the approach by storing simplified geometric data and regenerating the visual templates in real-time during operation. This allows the system to reconstruct the full trajectory display from minimal stored parameters, eliminating the need for large pre-stored image files.
2Quantity of substance
If the computer memory is increased to store all dynamic template images, then complete trajectory data can be stored, but the device complexity and cost increase
Solution Approach 1:
The system extracts only the essential geometric parameters (coordinates of points defining the template) from the complete image files. Instead of storing entire images, the system stores minimal data sets containing only the critical trajectory points, dramatically reducing memory requirements while preserving the functional ability to display accurate vehicle trajectory guidance.
Solution Approach 2:
The patent creates simplified geometric representations (copies) of the original template images. These copies contain only the essential coordinate data needed to reconstruct the templates, serving as lightweight substitutes that maintain functional equivalence while occupying minimal storage space.
3Ease of manufacture
If dynamic templates are pre-stored in memory during manufacturing, then the system can provide trajectory guidance, but the assembly line time required becomes too long
Solution Approach 1:
The patent extracts only the essential geometric parameters (coordinates of points defining the template) from the complete image files. Instead of storing entire images, the system stores minimal data sets containing only the critical trajectory points, dramatically reducing memory requirements while preserving the functional ability to display accurate vehicle trajectory guidance.
Solution Approach 2:
The system performs preliminary calculation of the essential geometric parameters during manufacturing, but stores only the condensed results rather than complete templates. This preliminary processing enables rapid deployment during assembly while minimizing the time required for memory programming.
4Adaptability or versatility
If the reversing camera or its position is modified, then the system can adapt to different configurations, but the templates must be regenerated and relocated in memory
Solution Approach 1:
The system implements dynamic template generation where the display templates are calculated in real-time based on current camera parameters and vehicle characteristics. When camera configuration changes occur, the system automatically recalculates the templates using updated parameters without requiring manual memory reprogramming, enabling easy adaptation to different configurations.
Solution Approach 2:
The system performs self-updating of templates when camera configuration changes are detected. Instead of requiring external intervention to regenerate and relocate templates in memory, the system automatically detects parameter changes and recalculates the necessary display templates using the stored geometric parameters and new camera data.
Data Source
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AI summary
The invention relates to a method to assist with the reversal manoeuvre of a motor vehicle (1) which is provided with a reverse camera (5) and a display screen capable of displaying images acquired by the reverse camera, which includes: a step of acquiring a front steering lock angle (αav) relative to the angle of orientation of the steering wheel of the motor vehicle; a step of calculating a dynamic gauge representing the predictable trajectories of the rear wheels (4) of the motor vehicle, in accordance with said front steering lock angle; and a step of displaying said dynamic gauge on the display screen by superimposing the images acquired by the reverse camera. According to the invention, a step of acquiring the speed (V) of the motor vehicle is provided, and said dynamic gauge is calculated also in accordance with the speed of the motor vehicle.