Forage Harvester Feed Control for Crop Mat Thickness
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Solution Overview
Problem
Conventional forage harvesters face issues with maintaining a consistent crop mat thickness and cutting length, leading to potential blockages and reduced chopping quality, especially under varying humidity and crop conditions.
Innovation Solution
A forage harvester equipped with a sensor to detect the mat thickness and a control circuit that adjusts the conveying speed of the feed device to maintain a selected mat thickness, while simultaneously adjusting the speed of the crop processing device to maintain the desired cutting length, thereby ensuring constant operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying speed of the feed device is increased to maintain constant crop processing device speed for longer cutting lengths, then the crop processing efficiency is improved, but the crop mat thickness decreases leading to reduced pre-compression and chopping quality
Solution Approach 1:
The patent applies dynamics by making the conveying speed of the feed device variable rather than fixed. The control circuit dynamically adjusts the conveying speed based on real-time feedback from the mat thickness sensor, allowing the system to adapt to different operating conditions and maintain optimal mat thickness across varying cutting lengths and forward speeds
Solution Approach 2:
The patent implements feedback control by using a sensor to detect mat thickness and feeding this information to a control circuit. The control circuit compares the detected mat thickness with a desired setpoint and automatically adjusts the conveying speed of the feed device to maintain optimal mat thickness, eliminating the need for manual adjustments and operator intervention
2Manufacturing precision
If the conveying speed of the feed device is reduced to increase crop mat thickness for better pre-compression, then the chopping quality is improved, but the crop processing device operates at reduced speed leading to lower productivity
Solution Approach 1:
The system dynamically adjusts the conveying speed based on actual operating conditions. When longer cutting lengths are selected or forward speed decreases, the control circuit increases conveying speed to maintain mat thickness, preventing crop accumulation and blockages while maintaining processing efficiency
Solution Approach 2:
The patent changes the operating parameters of the feed device based on detected mat thickness. The control circuit modifies the conveying speed parameter in response to sensor feedback, allowing the system to optimize both mat thickness and processing speed under different operating conditions
3Reliability
If manual adjustments are made to maintain crop mat thickness under varying forward speeds, then the operating conditions can be optimized, but the complexity of operation increases and interruptions are required
Solution Approach 1:
The system performs self-service by automatically monitoring mat thickness and adjusting its own conveying speed through the control circuit. This eliminates the need for operator intervention and manual adjustments, allowing the forage harvester to maintain optimal operating conditions autonomously
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated control system. The control circuit electronically regulates the conveying speed based on sensor feedback, substituting manual operation with an automated control mechanism that continuously maintains optimal operating conditions
Data Source
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AI summary
The field chopper has a drive unit (26), a housing unit (2), a control device (5) and a surface processing device (31) for receiving a harvested crop (40). A loading device (3,4,13,14) is provided for the surface processing device which is attached on the housing unit for the chopped harvested crop. The conveying speed of the loading device is adjusted depending on a produce mat thickness (23) or the rotational speed of a produce processing device (30) is adjusted depending on the cut length of the harvested crop. An independent claim is also included for a method for operating a field chopper.