Three-Point Hitch Arm Control for Terrain-Following Orientation
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Solution Overview
Problem
Existing three-point hitch systems on tractors lack the ability to independently raise and lower holding arms relative to each other, making it difficult to maintain proper implement orientation on uneven terrains and avoid obstacles without manual intervention.
Innovation Solution
A three-point hitch control system with independently controllable actuators for each holding arm, coupled with sensors and a controller that automatically adjusts the height of the arms based on terrain and obstacle detection, allowing for precise orientation and navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rock shaft is used to interconnect holding arms, then the structure is simple and reliable, but the holding arms cannot be adjusted independently relative to each other
Solution Approach 1:
The hitch system is segmented by removing the rock shaft that previously interconnected the holding arms. Each holding arm is now independently controllable through separate actuators, allowing independent adjustment while simplifying the mechanical linkage structure.
Solution Approach 2:
The system transitions from a static, mechanically linked structure to a dynamic, independently controllable system. Electronic control units and actuators enable real-time independent adjustment of each holding arm based on terrain conditions and implement requirements.
2Extent of automation
If holding arms are mechanically linked, then the system is easier to control manually, but automatic terrain-following capability is lost
Solution Approach 1:
Sensors detect terrain conditions and implement position, providing feedback to electronic control units. The control units process this information and automatically adjust each holding arm's position to maintain proper implement orientation on uneven terrain.
Solution Approach 2:
The mechanical linkage system is replaced with an electronic control system. Instead of mechanical coupling through a rock shaft, independent actuators controlled by electronic control units manage each holding arm, enabling automatic terrain-following functionality.
3Manufacturing precision
If independent actuators are added to each holding arm, then terrain-following precision is improved, but system complexity and cost increase
Solution Approach 1:
The electronic control system serves multiple functions: it controls each holding arm independently for terrain-following, monitors sensor data, coordinates actuator operation, and can adapt to different implement types. This multi-functionality justifies the added complexity by providing precise control without requiring separate systems for each function.
Data Source
AI summary
A tractor three-point hitch control system may include a tractor having a main body and a three-point hitch coupled to the main body. The three-point hitch may include a first holding arm, a second holding arm, and a top link. The system further includes a first actuator to raise and lower the first holding arm, a second actuator to raise and lower the second holding arm independent of raising and lowering the first holding arm, and a controller to output control signals to the first actuator and the second actuator to adjust an orientation of the first holding arm relative to the second holding arm.