Drive-by-wire rollover control algorithm
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Solution Overview
Problem
Current vehicle stability and rollover control systems are inadequate when a driver continues to oversteer beyond the correction capabilities of torque and brake adjustments alone, necessitating an enhanced solution for maintaining vehicle stability and preventing rollovers.
Innovation Solution
A vehicle stability control system that includes a drive-by-wire controller and sensors to read input signals from transducers and sensors, calculating a rollover potential and overriding the drive-by-wire control to adjust steering and other subsystems to prevent rollovers, even if the driver's inputs lead to unstable conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque and brake adjustments are used to correct oversteering, then vehicle stability is improved, but the system fails when driver oversteering exceeds correction capabilities
Solution Approach 1:
The patent replaces the mechanical brake and torque adjustment system with an electronic steer-by-wire control system. The stability control system overrides the driver's steering input electronically through the steer-by-wire mechanism, allowing for more precise and extensive correction capabilities beyond what mechanical brake adjustments alone can achieve.
Solution Approach 2:
The system changes the steering angle parameter dynamically by overriding the driver's steering wheel input through the steer-by-wire control. The controller calculates a corrected steering angle that reduces oversteering while maintaining vehicle stability, allowing for continuous adjustment beyond the limited range of brake-only corrections.
2Reliability
If the system overrides driver inputs to prevent rollovers, then vehicle safety is improved, but driver control is reduced
Solution Approach 1:
The system continuously monitors vehicle dynamics parameters (lateral acceleration, steering angle, wheel speeds) and provides feedback to the controller. When rollover risk is detected, the system overrides the steering input with a corrected value that maintains stability while gradually returning to driver intent as conditions improve, creating a feedback-based balance between safety and control.
Solution Approach 2:
The override control is dynamic rather than static - the system adjusts the steering correction based on real-time vehicle conditions. As the vehicle stabilizes, the system gradually reduces the override amount, allowing the driver to regain full control when safe, thus balancing safety intervention with driver autonomy.
Data Source
AI summary
According to one embodiment, a vehicle can be implemented with a drive-by-wire controller which operates subsystems of the vehicle such as throttle, brakes, and steering based on electrical signals from transducers on the vehicle controls and without a direct physical link between the controls, such as the steering wheel, and the components of the corresponding vehicle subsystem. In such cases, the stability control feature of the vehicle can be adapted to detect conditions such as oversteering which can make the vehicle unstable and unsafe and can adjust the steering and other controls of the vehicle to correct the unstable or unsafe condition regardless of the physical input on the steering wheel and other controls.