Fertilizer Spreader Wind Correction Control
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Solution Overview
Problem
Centrifugal fertilizer spreaders struggle to maintain even fertilizer distribution in windy conditions, often causing fertilizer to be thrown over field boundaries, which is environmentally undesirable.
Innovation Solution
The method involves measuring wind strength and direction to adjust target values for actuators, using two correction modes to compensate for wind effects: increasing the spread pattern on the windward side and reducing it on the leeward side, with specific adjustments for boundary spreading to prevent fertilizer from crossing the field boundary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wind correction is applied by increasing throw distance on windward side, then fertilizer distribution evenness is improved, but fertilizer may be thrown over field boundary
Solution Approach 1:
The patent applies different correction strategies to different sides of the spreader: on the windward side, target values are adjusted to compensate for wind effects and maintain distribution evenness, while on the leeward side near the field boundary, the correction is limited or deactivated to prevent fertilizer from being thrown over the boundary. This localized differentiation resolves the contradiction by allowing wind compensation where safe and preventing boundary violations where risky.
Solution Approach 2:
The spread pattern is divided into multiple zones (windward side, leeward side, boundary areas) with different correction rules applied to each zone. The control system segments the field into areas where full wind correction is acceptable and areas where boundary protection takes priority, allowing simultaneous achievement of distribution evenness and boundary compliance through zone-specific control strategies.
2Manufacturing precision
If target values are adjusted to compensate for wind, then predetermined spread pattern is restored, but environmental regulations may be violated at field edges
Solution Approach 1:
The system proactively identifies field boundary areas and pre-limits the wind correction that would otherwise be applied. By anticipating the potential environmental violation before it occurs, the system deactivates or limits the correction unit in boundary zones, preventing fertilizer from being thrown over the boundary while still applying full correction in interior areas where no such risk exists.
Solution Approach 2:
Different quality control rules are applied to different spatial locations: in field interior areas, the primary goal is restoring the predetermined spread pattern through wind correction, while at field boundary areas, the primary goal shifts to preventing environmental violations. This local differentiation of control objectives resolves the contradiction between pattern accuracy and environmental compliance.
3Reliability
If correction unit is deactivated at field edge, then boundary spreading compliance is improved, but fertilizer distribution evenness deteriorates
Solution Approach 1:
The control system segments the operational area into boundary zones where compliance is prioritized and interior zones where distribution evenness is prioritized. By applying correction only in interior areas and limiting it at boundaries, the system achieves overall compliance while maintaining acceptable distribution evenness through the combined effect of corrected and uncorrected zones.
Solution Approach 2:
Instead of applying full wind correction uniformly across all areas, the system applies partial correction only where necessary (interior areas), accepting that boundary areas will have reduced correction. This partial action approach maintains boundary compliance while still improving distribution evenness in the majority of the field area through selective correction application.
Data Source
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AI summary
The invention relates to a method for correcting the spreading pattern (17) of a fertilizer spreader (1), and to a fertilizer spreader, wherein wind speed and wind direction are measured and at least one setpoint for controlling/regulating at least one actuator (4, 9) for correcting the spreading pattern is adjusted depending on the measured wind speed and wind direction, wherein in a first correction mode, in the case of crosswinds, the at least one setpoint is adjusted such that the lateral extent of the spreading pattern on the side of the fertilizer spreader facing the crosswind increases outwards, and in a second correction mode, the at least one setpoint is adjusted such that the lateral extent of the spreading pattern on the side facing away from the crosswind decreases, wherein when spreading at a field boundary (32), the first correction mode is deactivated on the side of the fertilizer spreader facing the field boundary and the wind.