Variable Fan Drive for Combine Cleaning System
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Solution Overview
Problem
Conventional combines face inefficiencies in their cleaning systems due to varying throughput during harvesting, leading to grain loss and reduced efficiency, as the fan speed is not adequately adjusted to manage the load effectively, resulting in either excessive airflow that blows grain into the residue system or insufficient airflow that allows MOG to enter the grain tank.
Innovation Solution
A system that includes sensors to detect operational parameters of the fan drive load and a controller to adjust the cleaning fan speed based on comparisons to set thresholds, ensuring optimal airflow by increasing fan speed during low load conditions and decreasing it during high load conditions, thereby optimizing the separation of grain and residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fan speed is increased to handle high throughput, then cleaning efficiency is improved, but grain loss increases due to excessive airflow blowing grain into residue system
Solution Approach 1:
The fan speed is made dynamically adjustable based on real-time load conditions. The controller continuously monitors fan drive load and adjusts fan speed accordingly, transitioning from a static fixed-speed system to a dynamic variable-speed system that adapts to changing throughput conditions.
Solution Approach 2:
The system changes the operational parameter of fan speed based on detected load conditions. When load exceeds a threshold, fan speed is reduced to prevent grain loss; when load is below threshold, fan speed is increased to maintain cleaning efficiency, thus optimizing performance across varying operating conditions.
2Loss of substance
If fan speed is decreased to prevent grain loss, then grain loss is reduced, but cleaning efficiency deteriorates due to insufficient airflow allowing MOG to enter grain tank
Solution Approach 1:
The system implements a feedback control mechanism where the controller continuously monitors fan drive load and adjusts fan speed based on the detected conditions. This closed-loop feedback ensures that fan speed is optimized in real-time to prevent both grain loss and MOG contamination.
Solution Approach 2:
The fan speed is made dynamically adjustable based on real-time load conditions. The controller continuously monitors fan drive load and adjusts fan speed accordingly, transitioning from a static fixed-speed system to a dynamic variable-speed system that adapts to changing throughput conditions.
3Device complexity
If fixed fan speed is used to simplify control, then device complexity is reduced, but adaptability deteriorates as system cannot respond to varying throughput conditions
Solution Approach 1:
The system implements a feedback control mechanism where the controller continuously monitors fan drive load and adjusts fan speed based on the detected conditions. This closed-loop feedback ensures that fan speed is optimized in real-time to prevent both grain loss and MOG contamination.
Solution Approach 2:
The system performs self-adjustment by automatically monitoring its own load conditions and regulating fan speed without external intervention. The controller detects fan drive load and autonomously adjusts fan speed to maintain optimal operating conditions.
Data Source
AI summary
Included is a combine having a feeder housing for receiving harvested crop, a separating system for threshing the harvested crop to separate grain from residue, a crop cleaning system including a cleaning fan powered by a fan drive to propel the residue into a residue system of the combine, at least one sensor for detecting an operational parameter of the fan drive, and a controller coupled to the at least one sensor. The controller is configured to determine a load on the fan drive from the detected operational parameter, compare the determined load to a load threshold, and control a speed of the cleaning fan based on the comparison.