Combine Header Transverse Control Beyond Ground Sensor Range
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Solution Overview
Problem
Existing methods for operating a front attachment on a self-propelled combine harvester, adjustable in height by actuators, face limitations in transverse control when the crop is cut above the measuring range of distance sensors, requiring additional contact-free sensors or operator intervention, which can be overwhelming.
Innovation Solution
A method and apparatus that utilize pressure-controlled support elements and sensor units on side segments to perform transverse control independently of ground-contacting distance sensors, using substitute variables like deflection differences and scaling factors to extend the working range beyond sensor limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground-contacting distance sensors are used to control cutting height, then measurement precision is improved within their measuring range, but the working range is limited when crop is cut above sensor range
Solution Approach 1:
The patent introduces intermediary variables (deflection differences of support elements, inclination angles, transverse position angles) that mediate between the physical state of the attachment and the control system. These intermediaries allow the control system to infer ground distance information without direct sensor contact, extending the working range beyond the limited measuring range of ground-contacting sensors.
Solution Approach 2:
The patent replaces direct mechanical/optical distance measurement (ground-contacting sensors) with an indirect measurement system based on mechanical deflection sensing. By measuring deflection differences of support elements and using these as substitute variables, the system achieves distance measurement capability without requiring the sensors to physically contact the ground within a specific range.
2Adaptability or versatility
If additional contact-free sensors are installed to extend measuring range, then working range is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing support elements serve multiple functions: they provide structural support for the attachment while simultaneously acting as measurement elements through their deflection. This multi-functionality eliminates the need for separate ground-contacting distance sensors, reducing device complexity while maintaining extended working range capability.
Solution Approach 2:
The support elements are designed to automatically provide measurement information through their own deflection characteristics. The system uses the natural mechanical response of the support elements to ground proximity without requiring additional active sensing components, making the structure itself serve the measurement function.
3Adaptability or versatility
If operator intervention is used for height control above sensor range, then adaptability is improved, but ease of operation deteriorates due to overwhelming task
Solution Approach 1:
The patent implements an automatic feedback control system that continuously monitors deflection differences of support elements and adjusts the transverse position of attachment segments accordingly. This closed-loop control eliminates the need for continuous operator intervention, reducing workload while maintaining adaptability to varying ground conditions beyond the original sensor range.
Solution Approach 2:
The control system automatically adjusts the attachment position based on deflection measurements without requiring operator input. The system serves itself by using its own structural responses (deflections) as control inputs, eliminating the overwhelming manual control task while maintaining adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables transverse control of the attachment beyond the measuring range of distance sensors, reducing the need for additional sensors and allowing optimized adaptation to ground contours without operator intervention.
Implementation Method 1
wherein at least one position-adjustable support element acted upon by a pressure-controlled support force is arranged or positioned on each of the side segments
Data Source
AI summary
A method for operating an attachment of a self-propelled combine harvester and a combine harvester. The attachment is arranged on a pick-up device, height-adjustable by actuators, and has a center segment and at least two side segments, each having a position-variable support element arranged on the side segments and acted upon by a pressure-controlled support force. In a first operating mode, a control device performs transverse control based on distance between the ground and the attachment, with the distance being determined by signals generated by distance sensors on an underside of the attachment and contacting the ground the attachment and/or the given side segments depending on the signals. In a second operating mode, the control device performs transverse control based on signals generated by sensor units assigned to the support elements for determining the distance of the attachment and/or the respective side segments from the ground.