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Fundamental Limits in Combine Harvester Header Height Control.

Yangmin Xie¹, Andrew G Alleyne, Ashley Greer

¹Mem. ASME

Journal of Dynamic Systems, Measurement, and Control

|August 2, 2013

Summary

This study identifies key performance limits in combine harvester header height control. System design, including mechanical configuration and electrohydraulic actuation, restricts control bandwidth.

Area of Science:

Agricultural Engineering
Control Systems Engineering
Robotics

Background:

Combine harvester header height control is critical for efficient operation.
Existing control systems face limitations impacting performance and stability.
Understanding these limitations is essential for improving agricultural machinery automation.

Purpose of the Study:

To investigate fundamental performance limitations in combine harvester header height control systems.
To identify the specific subsystem characteristics contributing to these limitations.
To validate a model predicting these bandwidth constraints.

Main Methods:

Analysis of the open loop transfer function of the combine harvester system.
Modeling of the mechanical combine+header subsystem, noting underactuation and noncollocated sensor/actuator pairs.

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Characterization of the electrohydraulic actuation subsystem, including time delays.

Main Results:

The mechanical subsystem's underactuation and noncollocated elements limit achievable bandwidth.
The electrohydraulic subsystem's time delay significantly restricts control performance.
Combined subsystem effects exacerbate closed-loop bandwidth limitations.

Conclusions:

System design choices in mechanical configuration and electrohydraulic actuation fundamentally limit control bandwidth.
These limitations are inherent and stem from specific design choices.
Experimental validation confirms the existence and source of these bandwidth limitations.