Tractor Motion Stabilizer Yaw Rate Detection
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Solution Overview
Problem
Existing motion stabilizers for tractors struggle to accurately detect pendular motion caused by trailer swaying, often leading to erroneous brake activations due to similarities with slaloming maneuvers in no-traction states.
Innovation Solution
A motion stabilizer system that includes a yaw rate acquisition unit, steering angle acquisition unit, vehicle speed acquisition unit, standard yaw rate computation unit, and a pendular motion determination unit, which computes a determination parameter and threshold value based on steering-back maneuver evaluation to differentiate between pendular motion and slaloming, reducing incorrect determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake is activated when the characteristic value for transverse dynamics exceeds a threshold, then the traveling stability of the tractor is improved, but erroneous brake activations occur due to similarity between pendular motion and slaloming maneuvers
Solution Approach 1:
The detection of pendular motion is segmented into multiple independent parameters: yaw rate, lateral acceleration, and steering angle. Each parameter is evaluated separately with its own threshold, allowing the system to distinguish between genuine pendular motion and slaloming maneuvers by checking the coordination of all parameters simultaneously.
Solution Approach 2:
A determination parameter is introduced as an intermediary metric that synthesizes multiple detection values (yaw rate, lateral acceleration, steering angle) into a single comprehensive indicator. This determination parameter serves as a mediator between raw sensor data and brake activation decisions, enabling more accurate discrimination between different motion patterns.
2Measurement precision
If the threshold for pendular motion detection is lowered to reduce false positives, then detection accuracy is improved, but the system becomes more sensitive to normal steering operations
Solution Approach 1:
The detection thresholds are made dynamic rather than fixed. The system continuously monitors the relationship between steering angle and yaw rate, adjusting the determination parameter thresholds based on current operating conditions. This allows the system to adapt to different driving scenarios and maintain high detection accuracy while minimizing false positives.
Solution Approach 2:
The system employs feedback mechanisms where the determination parameter is continuously refined based on the relationship between steering operations and resulting yaw rates. By monitoring how steering inputs correlate with actual vehicle response, the system can dynamically adjust detection criteria to distinguish between intentional steering maneuvers and unintended pendular motion.
Data Source
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AI summary
In a pendular motion determination unit (100) of a motion stabilizer (SA) for a tractor (TR), a parameter computation unit (120) computes a determination parameter PA indicative of a quantity of change in an actual yaw rate Y, a threshold value setting unit (140) computes a threshold value PAth for the parameter PA, and a determination unit (150) determines that a pendular motion caused by swaying motion of a trailer (TL) is imparted, if the parameter PA is greater than the threshold value PAth. Based upon at least one of a value related to the actual yaw rate Y and a value related to the standard yaw rate Ys, an evaluation value computation unit (130) computes a steering-back maneuver evaluation value TS (indicative of a possibility of making periodical steering-back maneuvers), based upon which at least one of the threshold value PAth and the parameter PA is changed.