Steering Assistance System for Agricultural Vehicles
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Solution Overview
Problem
Agricultural vehicles with rigid floating front axles face undesired contact between steerable wheels and surrounding vehicle parts due to structural limitations, especially at varying steering angles, which can occur when traveling on uneven terrain.
Innovation Solution
A steering assistance system that includes a steering angle sensor, a swing angle sensor, and a control unit that calculates a permissible steering angle threshold based on structural limitations and swing angles, activating an actuating arrangement to reduce the steering angle when it exceeds the threshold, thereby preventing contact with surrounding parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering angle is increased to improve maneuverability, then the turning capability is enhanced, but the risk of contact between steerable wheels and surrounding vehicle parts increases
Solution Approach 1:
The patent implements dynamic threshold adjustment based on real-time swing angle detection. The control unit continuously monitors the swing angle of the rigid axle and dynamically calculates a permissible steering angle threshold that adapts to the current vehicle attitude. This dynamic approach allows the system to permit larger steering angles when the vehicle is level (improving maneuverability) while automatically restricting steering angles when the vehicle is tilted (reducing contact risk).
Solution Approach 2:
The system employs a closed-loop feedback mechanism where the swing angle sensor continuously provides information about the rigid axle's orientation to the control unit. The control unit processes this feedback and adjusts the permissible steering threshold accordingly. When the swing angle exceeds predetermined limits, the system provides feedback to the operator through the steering manipulator to reduce the steering angle, thereby preventing wheel contact with surrounding parts.
2Object-affected harmful factors
If the steering angle is restricted to avoid contact with surrounding parts, then the safety is improved, but the maneuverability is reduced
Solution Approach 1:
Rather than applying a static restriction, the system dynamically adjusts the steering angle threshold based on real-time swing angle measurements. When the rigid axle is level, the system permits larger steering angles for better maneuverability. When the axle tilts beyond safe limits, the system automatically reduces the permissible steering threshold to prevent contact, thus maintaining maneuverability when safe and ensuring safety when necessary.
Solution Approach 2:
The system changes the parameter of permissible steering angle based on the swing angle condition. The control unit calculates different threshold values depending on the detected swing angle, effectively adapting the steering restrictions to the current vehicle attitude. This parameter change approach ensures that safety restrictions are applied only when necessary, preserving maneuverability during normal operating conditions.
3Object-affected harmful factors
If automated steering interventions are implemented to prevent contact, then the safety is improved, but the system complexity increases
Solution Approach 1:
The system is designed to monitor its own operating conditions (swing angle) and automatically adjust the permissible steering threshold without external intervention. The control unit independently evaluates the swing angle data and determines the appropriate steering restrictions, making the system self-regulating. This self-service approach minimizes the need for complex external control systems while maintaining safety.
Solution Approach 2:
The control unit dynamically changes the threshold parameter based on swing angle conditions, implementing a simple yet effective control strategy. By focusing on adjusting a single critical parameter (permissible steering angle) rather than implementing complex multi-parameter control, the system achieves safety improvement with relatively simple device architecture.
Data Source
AI summary
A steering assistance system for an agricultural vehicle includes a rigid axle on which steerable wheels are mounted and which is mounted so as to float relative to a supporting vehicle structure. The system includes a steering angle sensor for detecting a steering angle of the steerable wheels, a swing angle sensor for determining a swing angle of the rigid axle relative to the supporting vehicle structure, an actuating arrangement for influencing the steering angle, and a control unit that calculates a threshold value permissible for the steering angle depending on the detected swing angle. If the detected steering angle exceeds a tolerance range specified for the threshold value, the control unit executes steering interventions for reducing the steering angle by activating the actuating arrangement to satisfy the threshold value.