Hydraulic Three-Point Lift Pressure Control for Uniform Soil Cultivation
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Solution Overview
Problem
Existing hydraulic three-point linkages on agricultural tractors result in undesirable variations in soil cultivation due to the reliance on implement weight for contact pressure, leading to inconsistent soil cultivation results.
Innovation Solution
A double-acting hydraulic cylinder system with a control valve arrangement, including a 3/2-way pilot valve and a 3/2-way main valve, allows for precise control of target pressure to enhance contact pressure and guide implements along defined contours, using feedback loops to maintain consistent operation and avoid uncontrolled pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-acting hydraulic cylinder is used, then the structure is simpler, but the contact pressure varies undesirably depending on soil conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static single-acting cylinder to a dynamic double-acting cylinder system. The control valve arrangement dynamically adjusts hydraulic pressure in both working chambers based on detected soil conditions, enabling real-time adaptation of contact pressure to maintain consistent soil cultivation across varying soil states.
Solution Approach 2:
The patent implements parameter changes by modifying the hydraulic pressure parameters in the working chambers of the double-acting cylinder. The control system varies the pressure differential between chambers to actively control implement contact pressure, transforming the system from passive weight-dependent pressure to active pressure-controlled operation.
2Ease of operation
If the implement weight alone is used for contact pressure, then no additional control is needed, but the soil cultivation result becomes inconsistent
Solution Approach 1:
The patent implements feedback control through a control valve arrangement that detects actual soil conditions and adjusts hydraulic pressure accordingly. The system continuously monitors cultivation results and modifies the pressure differential across the hydraulic cylinder chambers to maintain desired contact pressure, ensuring consistent soil cultivation uniformity.
Solution Approach 2:
The patent replaces the purely mechanical weight-dependent pressure system with a hydraulic control system. Instead of relying on implement weight alone, the system uses hydraulic pressure differential controlled by a valve arrangement to actively manage contact pressure, achieving precise control over soil cultivation consistency.
3Reliability
If a double-acting hydraulic cylinder with pressure control is implemented, then contact pressure can be precisely controlled, but the device complexity increases
Solution Approach 1:
The control valve arrangement serves multiple functions: it controls pressure differential for contact pressure regulation, adapts to varying soil conditions, and maintains consistent cultivation results. This multi-functionality justifies the increased device complexity by consolidating multiple control tasks into a single integrated system.
4Stability of the object's composition
If downward force is applied to counteract implement floatation, then guidance along surface contours is improved, but the system requires more complex pressure control
Solution Approach 1:
The feedback control mechanism detects implement floatation and surface contour variations, then adjusts the hydraulic pressure differential to apply appropriate downward force. This closed-loop control stabilizes implement positioning and maintains guidance along surface contours while managing the complexity through intelligent pressure regulation.
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
Enables uniform soil cultivation by adjusting contact pressure and preventing implement floatation, ensuring consistent performance in various agricultural tasks.
Implementation Method 1
a hydraulic cylinder with a working chamber which can be pressurised with hydraulic fluid to change the lifting position of a lower link
Implementation Method 2
By using a double-acting hydraulic cylinder and appropriately specifying the target pressure, it is possible to exert a downward force on the lower link
Data Source
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AI summary
Arrangement (10) for controlling a hydraulic three-point linkage (12), comprising a hydraulic cylinder (16) with a working chamber (18) which can be pressurized with hydraulic fluid to change the lifting position of a lower link encompassed by the hydraulic three-point linkage (12), and first and second poppet valves (24, 26) communicating with the working chamber (18), wherein the first poppet valve (24) is configured to establish an inlet connection (30) with a high-pressure source (22) and the second poppet valve (26) is configured to establish a return connection (32) with a hydraulic reservoir (28). This is a double-acting hydraulic cylinder (16) with a further working chamber (56) which is connected to a control valve arrangement (58) by means of which a predetermined target pressure can be set in the further working chamber (56).