Straw Walker Load Sensing for Proactive Grain Loss Control
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Solution Overview
Problem
Combine harvesters face challenges in minimizing grain loss during high-capacity harvesting due to aggressive threshing and separation processes, which damage straw and lead to grain kernels falling through the straw mat, resulting in inefficient separation and potential loss.
Innovation Solution
Implementing a method to control the combine harvester by using grain flow sensors distributed along the straw walker section to monitor the load and adjust threshing and separation settings proactively, adjusting rotational speeds and gap sizes to maintain optimal straw quality and prevent grain loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aggressive threshing and separation processes are used to maximize grain extraction at high capacity, then productivity increases, but straw quality deteriorates and grain loss increases
Solution Approach 1:
The system performs preliminary monitoring of straw walker load using grain flow sensors before grain loss occurs. The controller detects increased load on the straw walkers and proactively adjusts threshing and separation settings to prevent grain loss, rather than reacting after grain has already been lost.
Solution Approach 2:
The system implements a feedback control loop where grain flow sensors continuously monitor the load on the straw walkers. This information is fed back to the controller, which automatically adjusts the aggressiveness of threshing and separation processes to maintain optimal grain flow through the straw walkers, preventing grain loss while maximizing productivity.
2Productivity
If aggressive threshing and separation processes are used to maximize grain extraction, then productivity increases, but straw quality deteriorates
Solution Approach 1:
The system proactively monitors straw walker load and adjusts threshing and separation settings before excessive straw damage accumulates. By detecting increased grain flow onto the straw walkers in advance, the system can reduce threshing aggressiveness to preserve straw quality while still maintaining high productivity.
Solution Approach 2:
The feedback control loop continuously monitors grain flow sensors to assess the impact of current threshing and separation settings on straw quality. The controller dynamically adjusts process parameters to maintain an optimal balance between productivity and straw quality, preventing excessive straw damage.
3Measurement precision
If grain loss sensors are placed at the rear end of straw walkers to detect grain loss, then grain loss can be detected, but the control system can only react when it is already too late
Solution Approach 1:
The system places grain flow sensors along the length of the straw walkers to detect increased grain flow and load buildup in advance of actual grain loss. This early detection enables the control system to adjust settings proactively before grain falls off the rear end, eliminating the time delay associated with reactive control.
Solution Approach 2:
The distributed grain flow sensor arrangement provides continuous feedback about grain flow conditions at multiple points along the straw walkers. This enables the controller to detect trends and adjust settings in real-time, maintaining optimal separation efficiency and preventing grain loss before it occurs.
Data Source
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AI summary
A system (100) and a method are provided for controlling a combine harvester (10). The method comprises the steps of receiving grain flow sensor signals from a plurality of grain flow sensors (210), based on the received grain flow sensor signals, determining a current load on a straw walker section (22), and based on the current load, adjusting an aggressiveness setting of a threshing and separation section of the combine harvester (10). The grain flow sensors (210) are provided underneath and adjacent to a crop transfer surface (260) of the straw walker section (22) of the combine harvester (10) and are distributed over a length of the straw walker section (22).