Steering Angle Sensor Correction Using Camera-Based Object Tracking
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Solution Overview
Problem
In steer-by-wire systems, there is a discrepancy between the actual steering angle and the sensor value due to the absence of a mechanical link, leading to inaccuracies that need to be addressed.
Innovation Solution
A sensor correction device and method that utilizes image sensors and a comparator to determine the actual steering angle by comparing it with a calculated angle based on object position changes, applying correction values when discrepancies exceed a reference threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a steer-by-wire system is used to reduce weight, then vehicle weight is reduced, but steering angle accuracy deteriorates due to absence of mechanical link
Solution Approach 1:
The patent introduces an intermediary object recognition system using cameras and image processing to mediate between the steering input and output. By detecting objects in the environment and calculating their position changes, the system derives a reference steering angle that acts as a mediator to correct discrepancies in the steering angle sensor readings, thereby maintaining accuracy without mechanical linkage.
Solution Approach 2:
The patent replaces the mechanical linkage between steering input and output with an optical/electronic system. Instead of using physical connections to ensure accuracy, the system uses cameras to capture images, processes them to detect object positions, and calculates steering angles through software algorithms, substituting the mechanical verification system with an optical-electronic one.
2Device complexity
If sensor values are used directly without correction, then system complexity is reduced, but steering control precision deteriorates due to sensor errors
Solution Approach 1:
The patent implements a feedback mechanism where the steering angle sensor value is continuously compared with the reference steering angle calculated from object position changes. The difference between these two values is used to generate a correction value that is applied to the sensor reading, creating a closed-loop feedback system that automatically compensates for sensor errors and maintains precision.
Data Source
AI summary
The disclosure relates to a sensor correction device and method. Specifically, a sensor correction device according to the disclosure comprises a receiver receiving image information and a first steering angle from a plurality of image sensors and a steering angle sensor (SAS), respectively, an object detector detecting an object from the image information and detecting a position of the object, a comparator comparing a second steering angle calculated based on a position change amount of the object with the first steering angle, and a controller applying an SAS correction value according to the position change amount of the object to the first steering angle when a difference between the first steering angle and the second steering angle is larger than or equal to a first reference value.