Camera-Based Vehicle Rollover Detection Without Tilt Sensors
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Solution Overview
Problem
Existing vehicle rollover determination systems increase production costs when tilt sensors are installed to correct roll angular velocity-integrated roll angles, as tilt sensors are not typically installed in vehicles.
Innovation Solution
A determining device uses a processor to detect a first roll angle based on vehicle surroundings via camera images, sets a rollover determination scale using this angle, and determines rollover based on roll angular velocity and integrated roll angular velocity, without the need for additional tilt sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tilt sensor is installed to correct the roll angular velocity-integrated roll angle, then the measurement precision of the roll angle is improved, but the manufacturing cost increases
Solution Approach 1:
The system uses the vehicle's existing camera to perform self-measurement of the roll angle by detecting the inclination of the road surface or horizon in images, eliminating the need for external tilt sensors. The processor analyzes image data to determine the roll angle, allowing the vehicle to service its own measurement needs using already-installed equipment.
Solution Approach 2:
The patent replaces the mechanical tilt sensor system with an optical/image processing system. Instead of using physical sensors to detect inclination, the system captures images and uses computer vision algorithms to calculate the roll angle by analyzing the orientation of horizontal lines or the horizon in the captured images.
2Device complexity
If the roll angle is determined by integrating roll angular velocity with zero initial value, then the calculation process is simplified, but the measurement precision deteriorates when the vehicle starts on an inclined road
Solution Approach 1:
The system performs preliminary measurement of the actual roll angle using image analysis before integration begins. By detecting the initial inclination of the road surface through camera images, the system establishes an accurate initial value that compensates for inclined starting positions, ensuring precision from the beginning of the integration process.
Solution Approach 2:
The system uses image-based roll angle detection as feedback to correct and validate the integrated roll angle calculations. The processor continuously compares the integrated value with the image-based measurement, using the latter to adjust and maintain accuracy of the roll angle determination throughout vehicle operation.
Data Source
AI summary
A determining device has a processor configured to detect a first roll angle by which a vehicle has rotated around a front-rear axis of the vehicle as a center, based on an image representing surrounding environment of the vehicle, to set a rollover determination scale based on the detected first roll angle, and to determine whether or not the vehicle has rolled over, using the rollover determination scale, based on a roll angular velocity representing the rotational speed around the front-rear axis of the vehicle and a second roll angle calculated by integrating the roll angular velocity.