Hydraulic Control for Swath Alignment in Agricultural Implements
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Solution Overview
Problem
Current agricultural implement operations result in misalignment of swath beginnings and endings due to unequal lifting and lowering times, leading to increased headland spacing and overlap, despite the use of GPS for determining swath locations.
Innovation Solution
A hydraulic control system that adjusts the implement's transition times between working and non-working positions by determining and equalizing the time required to lift and lower the implement, ensuring closer alignment of swath beginnings and endings through sensor feedback and fluid control adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hydraulic system operates with a fixed flow rate, then the system is simple to control, but the lifting and lowering times are unequal causing misalignment of swath beginnings and endings
Solution Approach 1:
The hydraulic control system transitions from a fixed flow rate configuration to a variable flow rate system that dynamically adjusts based on the operational phase (lifting vs. lowering). The controller modifies the flow rate to compensate for the inherent time difference between lifting and lowering operations, enabling precise alignment of swath beginnings and endings while maintaining ease of operation through automated control.
2Adaptability or versatility
If the implement is raised and lowered at the end of each swath, then the implement can be repositioned for the return trip, but the unequal lifting and lowering times increase headland spacing requirements
Solution Approach 1:
The system changes the hydraulic flow rate parameter dynamically during the lifting and lowering operations. By adjusting the flow rate based on the specific operational phase and detected time differences, the system equalizes the lifting and lowering times, thereby reducing the headland spacing requirements while maintaining the necessary implement repositioning capability.
3Measurement precision
If GPS information is used to determine swath locations, then the beginning and end locations can be identified, but the unequal transition times still cause misalignment between adjacent swaths
Solution Approach 1:
The system incorporates a controller that receives feedback from sensors detecting the actual lifting and lowering times of the implement. This feedback information is used to calculate time differences and adjust the hydraulic flow rate accordingly. The feedback mechanism ensures that the swath boundaries align precisely by compensating for the unequal transition times, while GPS continues to provide accurate location determination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for more efficient use of field space by minimizing headland requirements, ensuring precise alignment of adjacent swaths, and enabling either manual or automatic control of the implement's position.
Implementation Method 1
The hydraulic control system is then adjusted to compensate for a detected difference between the times to bring the beginnings and ends of subsequent swaths into closer alignment
Implementation Method 2
A sensor is communicatively coupled to the fluid control unit and configured to output signals indicative of the penetration depth of the ground engaging tool
Data Source
AI summary
A traction unit drawn agricultural implement for treating a field along repeated generally parallel longitudinal swaths has a hydraulic system for lifting and lowering a ground engaging implement portion at the beginning and end respectively of each swath. A system for aligning the beginning of one swath with the termination of the previous swath determines initial lift and lower times and adjusts the hydraulic system to bring the times into closer conformity.