Speed-Adaptive PID Control for Agricultural Spray Boom Height
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Solution Overview
Problem
Longer agricultural sprayer booms face challenges in maintaining uniform vertical spacing due to ground undulations and crop canopy, leading to non-uniform spray patterns and application rates.
Innovation Solution
A boom height control system that adjusts boom positions using proportional-integral-derivative (PID) control, tailoring P-gain and D-gain values based on speed and terrain conditions to optimize boom height adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the boom length is increased to cover more area, then the spray coverage area is improved, but the vertical spacing uniformity deteriorates due to ground undulations
Solution Approach 1:
The boom is divided into multiple independently controllable sections, each equipped with its own actuator. This segmentation allows each section to be adjusted independently to maintain uniform vertical spacing despite ground undulations, while the overall boom length remains extended for wide coverage.
Solution Approach 2:
The boom sections are made dynamically adjustable through actuators that can change the position of each section in real-time. This dynamic control enables the boom to adapt to varying terrain conditions, maintaining consistent spray height across the entire width while preserving the ability to cover large areas.
2Manufacturing precision
If automatic boom height control is implemented to maintain uniform spacing, then the spray pattern consistency is improved, but the device complexity increases
Solution Approach 1:
Sensors are integrated into the boom sections to continuously monitor vertical spacing and provide feedback to the control system. This feedback mechanism enables automatic adjustment of boom positions to maintain uniform spacing, improving spray pattern consistency while the modular nature of the control system keeps the added complexity manageable.
Solution Approach 2:
The control system adjusts operational parameters (actuator positions, spray height) dynamically based on sensor feedback and terrain conditions. By changing these parameters in real-time, the system maintains consistent spray patterns without requiring overly complex mechanical structures.
3Manufacturing precision
If the boom is made adjustable to compensate for terrain variations, then the spray application accuracy is improved, but the operational complexity increases
Solution Approach 1:
The boom system incorporates automatic control mechanisms that self-adjust to terrain variations without requiring manual intervention. The sensors and actuators work autonomously to maintain optimal spray height, improving application accuracy while reducing the operational burden on the user.
Solution Approach 2:
The adjustable boom system serves multiple functions: it maintains uniform spacing, adapts to terrain variations, and ensures consistent spray application. This multi-functionality is achieved through an integrated control system that handles various operational requirements through a unified approach, simplifying the overall operation despite the enhanced capabilities.
Data Source
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AI summary
A boom height control system for an agricultural crop sprayer (10) includes a spray boom (22) and an actuator (191:194) arranged to adjust a position of at least a portion of the spray boom in response to a position adjustment command. A speed sensor (122) is provided to measure a forward speed of the sprayer and generate a speed value. A position sensor (160,165) is provided to measure a current position of the spray boom portion and generate a current position value. A controller (120) is in communication with the speed sensor (122), the position sensor (160,165) and the actuator (191:194). The controller (120) is configured to generate the position adjustment command based upon a target position value, a current position value and a speed value.