Hydraulic Cam Control for Agricultural Implement Obstacle Alignment
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Solution Overview
Problem
Existing hydraulically operated agricultural systems face issues with automatic control interfering with manual control, leading to conflicting commands, and the reaction to obstacles is not linear, causing inefficiencies and potential damage.
Innovation Solution
A system with a probe connected to a cam on an arm, using a non-circular cross-section to control a hydraulic circuit, allowing non-linear movement adjustment via a spring-activated piston, and incorporating operator and probe-controlled distribution valves to prevent command cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a hydraulic circuit is used for automatic control of the agricultural implement, then the implement can automatically avoid obstacles, but the automatic control may interfere with manual control leading to conflicting commands
Solution Approach 1:
A cam mechanism with a non-circular cross-section is introduced as an intermediary between the probe detection system and the hydraulic circuit. The cam's specific geometry with recesses and projections transforms the probe's linear movement into non-linear hydraulic activation, creating a buffer that prevents direct conflict between automatic and manual control signals while enabling sophisticated obstacle response patterns.
Solution Approach 2:
The system employs a dynamic cam mechanism where the non-circular cross-section changes the activation characteristics based on the probe's position. As the probe moves, the cam's varying radius and profile dynamically modulate the hydraulic circuit activation, allowing the system to adapt its response intensity and timing rather than providing a fixed linear response.
2Device complexity
If the reaction to obstacles is made linear, then the control system is simple, but the implement may move too much or too little depending on obstacle type
Solution Approach 1:
The cam mechanism utilizes asymmetric, non-circular cross-sections with strategically positioned recesses and projections. This asymmetry creates different activation thresholds and response intensities for different probe deflection amounts, enabling the system to differentiate between minor obstacles (requiring small adjustments) and major obstacles (requiring large adjustments) without complex electronic controls.
Solution Approach 2:
The cam's geometric parameters (radius, profile shape, recess depth, projection height) are specifically designed to transform a simple linear probe movement into a non-linear hydraulic activation pattern. This parameter transformation allows a single simple sensor to control a versatile response range, effectively changing the system's sensitivity and response magnitude based on obstacle characteristics.
3Measurement precision
If multiple sensors and electronic components are used for obstacle detection, then detection accuracy improves, but costs increase and components become prone to damage
Solution Approach 1:
The invention extracts and eliminates the need for complex electronic sensor arrays and control systems by using a purely mechanical cam-based solution. A single simple probe mechanically connected to the cam mechanism provides sufficient detection capability, removing numerous vulnerable electronic components while maintaining adequate obstacle detection and response functionality.
Solution Approach 2:
The mechanical cam mechanism is self-regulating and self-adjusting based on pure mechanical input from the probe. The system uses the physical principles of cam-follower mechanics to automatically translate probe deflection into appropriate hydraulic responses without requiring electronic processing, decision-making algorithms, or complex control logic, thereby simplifying the system while maintaining functionality.
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 smooth operation without vibrations, allows for precise movement adjustments, and ensures the agricultural implement reacts appropriately to obstacles without manual-control interference.
Implementation Method 1
The activation element is elastically mounted by an elastic element, preferably a spring. This spring resists the pressure of the cam. When the cam no longer presses against the activation element, the spring returns the activation element to its initial position.
Data Source
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AI summary
The invention relates to an agricultural implement and to a system for controlling the agricultural implement (100) for a towing vehicle (200), comprising a sensor (101) for detecting obstacles. According to the invention, the sensor (101) is connected to a cam (102), which is pivotally coupled to an arm (103) that supports the agricultural implement; wherein the arm (103) is pivotally coupled to a frame of a towing vehicle (200) and comprises a fluid-dynamic cylinder (104) which acts between the frame (200) and the arm (103); this cylinder (104) is controlled by a hydraulic circuit (110); the hydraulic circuit (110) is manually controlled by an operator (114) and by the sensor (101) by means of the cam (102); the cam (102) has a partially circular cross section having a non-circular portion and a cam recess (102a); the cam (102) pushes an activation element (106) of the hydraulic circuit (110), and the sensor (101) and the arm (103) rotate about the same axis.