Vehicle Sway Detection via Yaw-Lateral Phase Shift
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Solution Overview
Problem
Existing vehicle sway detection systems face challenges in distinguishing between sway and slalom, leading to false detections due to the combination of yaw and lateral accelerations caused by driver steering, which complicates accurate identification of sway conditions.
Innovation Solution
A method involving sensors to measure yaw and lateral acceleration, calculating the phase shift between these signals, and comparing the magnitude of the phase shift to a threshold value to determine if a vehicle is experiencing sway, allowing for independent engine torque reduction and braking to mitigate sway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sway detection is performed using yaw acceleration and lateral acceleration signals, then vehicle sway can be detected and reduced, but false detections occur due to inability to distinguish sway from slalom conditions
Solution Approach 1:
The system dynamically analyzes the phase relationship between yaw acceleration and lateral acceleration signals to distinguish sway from slalom conditions. By calculating phase shift magnitudes and comparing against threshold values, the system adapts its detection criteria based on the dynamic characteristics of vehicle motion, enabling accurate differentiation between sway and slalom without false detections
Solution Approach 2:
The invention changes the detection parameter from simple acceleration magnitude to phase shift magnitude between two acceleration signals. This parameter transformation allows the system to identify the characteristic phase relationship of sway motion while filtering out slalom conditions, thereby improving detection accuracy and reliability
2Stability of the object's composition
If independent braking forces are applied to each wheel to reduce sway, then vehicle stability is improved, but system complexity increases
Solution Approach 1:
The braking system is segmented into independent wheel-level controls, allowing each wheel to receive individual braking commands based on its specific contribution to sway. This segmentation enables precise stability control by applying braking forces selectively to wheels that need them, rather than applying uniform braking to all wheels
Solution Approach 2:
The system implements feedback control by continuously monitoring yaw acceleration and lateral acceleration signals, calculating phase shift magnitudes, and adjusting independent wheel braking forces accordingly. This closed-loop feedback mechanism automatically adjusts braking distribution to counteract detected sway while maintaining system stability
Data Source
AI summary
A method and apparatus for controlling a vehicle involves determining if the vehicle is swaying and if the vehicle is swaying, reducing a torque of an engine of the vehicle and/or applying independent braking forces to each wheel of the vehicle. A vehicle for controlling vehicle sway includes an engine, a plurality of wheels, a braking system configured to apply independent braking forces to each wheel, and a controller configured to control the engine and the braking system. The controller is configured to determine a correlation coefficient in accordance with any phase shift occurring between a yaw acceleration signal and a lateral acceleration signal. The correlation coefficient is compared to a threshold value to determine whether the vehicle is swaying. If the vehicle is swaying, the controller causes a torque of the engine to be reduced and/or braking forces to be applied independently to each wheel.