Electrohydraulic Hitch Control for Soil Compaction Management
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Solution Overview
Problem
Current systems for controlling tractor attachments in agricultural tractors are complex, costly, and insufficiently precise, particularly in addressing soil compaction issues, which can lead to poor soil conditions and reduced crop yields.
Innovation Solution
A device with an electrohydraulic hitch control system integrated with a soil density sensor that adjusts the control strategy based on real-time soil density data, allowing for targeted penetration or loosening of the soil to improve soil conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure traction control is used to prevent engine stalling by reducing resistance, then the engine can be prevented from stalling, but the plow pattern deteriorates on very inhomogeneous soils due to constant excessive lifting and lowering of the plow
Solution Approach 1:
The system changes the control parameter from pure traction control to a hybrid mode that incorporates position control feedback. This allows the plow depth to be maintained within a specified range while still responding to traction variations, thereby preventing engine stalling without excessive plow movement that would deteriorate the plow pattern.
Solution Approach 2:
The system uses position sensors to provide feedback on plow depth and incorporates this into the control loop. The hybrid control mode continuously adjusts the plow position based on both traction force variations and position feedback, ensuring stable plow pattern while preventing engine stalling through coordinated depth adjustments.
2Manufacturing precision
If full position control or high proportion of position control amplification factor is used to maintain plow pattern on very wavy and uneven soil, then the plow pattern is improved, but the plow cannot adapt as well to the soil profile via varying tractive force
Solution Approach 1:
The system implements a dynamic control mode that adapts the control strategy based on operating conditions. The hybrid control mode dynamically balances between position control (for pattern quality) and traction control (for soil profile adaptation), allowing the system to respond to both terrain variations and soil conditions optimally.
Solution Approach 2:
The system changes the control parameter weighting dynamically. In hybrid control mode, the position control amplification factor is adjusted to provide sufficient position stability while maintaining sensitivity to traction force variations, enabling both good plow pattern and adaptive depth control according to soil profile.
3Measurement precision
If two force measuring bolts are installed in the joint of the lower link to determine tensile force, then the total resistance or plowing force can be measured, but the system becomes more complex and cost-intensive
Solution Approach 1:
The system uses existing hydraulic control components and sensors for multiple purposes. The position sensors and hydraulic actuation system serve both the primary function of position control and the secondary function of inferring traction forces, eliminating the need for separate force measuring bolts and reducing system complexity.
Solution Approach 2:
The system uses the hydraulic actuation system as an intermediary to measure and control plow depth. By monitoring hydraulic pressure and actuator position, the system can infer traction forces without direct mechanical force sensors, simplifying the measurement system while maintaining control precision.
4Reliability
If the attachment is lifted to reduce resistance and prevent engine stalling, then the engine can be protected from stalling, but harmful soil compaction may occur and crop yields are reduced
Solution Approach 1:
The system changes from binary lift/not-lift control to continuous depth modulation within a specified range. The hybrid control mode allows small, controlled depth adjustments that maintain engine protection while minimizing the harmful effects of repeated lifting, thereby reducing soil compaction and preserving crop yield potential.
Data Source
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Figure 3a
AI summary
The invention relates to a device (1) for a vehicle (2) with a hydraulic actuation unit (3) for controlling the operation of an implement (4) on the vehicle (2), comprising an electro-hydraulic lifting mechanism control, an evaluation unit (20), and data-conducting connections (21) to a vehicle control unit (22) and a control unit (10) associated with the hydraulic actuation unit (3), wherein at least one soil density sensor (7) can be connected to the control unit (16). Furthermore, a method is proposed whereby such a device (1) enables the determination of soil compaction for the purpose of preventing or resolving harmful compaction.