Section Metering Control for Uniform Curved-Field Input Application
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Solution Overview
Problem
Agricultural implement systems face inefficiencies in applying inputs like seed or fertilizer, as the current distribution methods result in uneven application rates across the field, particularly at curved sections where the inner portions receive excessive and outer portions receive insufficient product due to varying ground speeds.
Innovation Solution
The implementation of adjustable metering devices for each frame section allows for independent control of product dispensing rates, compensating for ground speed variations and optimizing input application by using separate metering systems for each section, including separate tanks and pumps, and pressure control valves to ensure uniform distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If product is evenly dispersed across the width of the frame, then application simplicity is maintained, but application uniformity deteriorates at curved sections
Solution Approach 1:
The implement frame is divided into multiple frame sections, each with its own metering device. This segmentation allows independent control of product dispensing rates for different sections, enabling the system to maintain simplicity of operation while achieving uniform application by compensating for ground speed variations at curved sections.
Solution Approach 2:
The metering devices are made adjustable and controllable, allowing dynamic modification of product dispensing rates. This enables the system to adapt to changing ground speeds during curved section traversal, maintaining application uniformity while preserving operational simplicity through centralized control.
2Device complexity
If a single metering system is used for the entire frame, then device complexity is reduced, but application precision deteriorates due to ground speed variations
Solution Approach 1:
The single metering system is segmented into multiple independent metering devices, each associated with a specific frame section. This segmentation increases application precision by allowing section-specific rate adjustments while keeping the overall system manageable through modular architecture.
Solution Approach 2:
Multiple metering devices are controlled through a centralized control system that can manage all sections uniformly or individually. This multi-functionality allows the system to operate in different modes (uniform or differential metering) without requiring completely separate control systems for each section.
3Device complexity
If product is applied at constant rate across all sections, then metering system simplicity is maintained, but productivity deteriorates due to product waste at partial crop areas
Solution Approach 1:
The metering devices are made dynamically controllable, allowing real-time adjustment of product dispensing rates. This enables the system to respond to varying crop area conditions, shutting off or reducing product application in areas where crops are absent, thereby improving productivity without significantly increasing system complexity.
Solution Approach 2:
The control system receives information about crop presence and ground speed, and uses this feedback to adjust metering rates for each frame section. This feedback mechanism enables the system to improve productivity by preventing product waste while maintaining relatively simple metering hardware.
Data Source
AI summary
Metering devices for an agricultural implement are present for applying a field input, for example, pneumatically delivered granular product including seed or fertilizer or sprayed liquid product including fertilizer and the like, to an agricultural field. In the applying of the field input, the rate of application of the dispensers of one section of the implement can be collectively varied in relation to the rate of application of the dispensers of a different section of the implement frame.