Harvester Speed Control Using Drive Power Feedback
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Solution Overview
Problem
Specifying a desired crop throughput for agricultural harvesters is difficult, especially for less experienced operators, often leading to underutilization or blockages due to incorrect settings.
Innovation Solution
A system with an external control loop that adjusts the drive speed of the harvester based on set and actual power output values, including an internal control loop to manage drive speed, allowing for easier and more accurate operation by focusing on available drive power output rather than crop throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operator specifies a desired crop throughput, then the drive speed can be controlled to maintain throughput, but it is difficult for less experienced operators to specify accurate values, leading to underutilization or blockages
Solution Approach 1:
The patent changes the controlled parameter from crop throughput to drive power output. Instead of requiring operators to specify throughput values, the system now uses the drive power output as the control parameter, which is easier to measure and control accurately. This parameter substitution resolves the contradiction by making the control system more operator-friendly while maintaining productivity control.
Solution Approach 2:
The patent introduces an intermediary relationship where drive power output serves as a mediator between the operator's input and the actual crop throughput control. By controlling power output as an intermediate parameter, the system indirectly achieves throughput control without requiring operators to directly specify throughput values, thus easing operational difficulty.
2Reliability
If the operator specifies too low a throughput value, then blockages are avoided, but the power output of the harvester is underutilized
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the actual drive power output and compares it with the desired power output. This feedback mechanism allows the system to dynamically adjust the drive speed to maintain optimal power utilization while preventing blockages, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The system dynamically adjusts the drive speed based on real-time power output measurements rather than using fixed throughput settings. This dynamic control enables the harvester to adapt to varying crop conditions, maximizing power utilization while maintaining reliable operation without blockages.
3Productivity
If the operator specifies too high a throughput value, then power output is maximized, but blockages occur
Solution Approach 1:
The feedback control system continuously monitors operating conditions and adjusts the drive speed to prevent blockages while maintaining high power utilization. When blockage risk is detected, the system automatically reduces speed, resolving the contradiction between maximizing productivity and ensuring reliability.
Solution Approach 2:
The system prepares for potential blockages by monitoring power output trends and adjusting speed proactively before blockages occur. This preventive approach allows the system to maintain high productivity while cushioning against reliability issues by anticipating and preventing blockage conditions.
Data Source
AI summary
An arrangement for control of the drive speed of a harvester comprises an internal control loop for control of the drive speed of the harvester, to which can be sent a set value and an actual value of a throughput-dependent parameter, and also an external control loop to make available the set value of the throughput-dependent parameter for the internal control loop, to which set and actual values regarding the power output of a drive of the harvester can be sent as input parameters.