Round Baler Moisture Sensing with Dual Humidity Compensation
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Solution Overview
Problem
Existing moisture sensors in agriculture machines suffer from accuracy issues due to crop material deposits and environmental factors, leading to unreliable moisture readings, especially in baling chambers.
Innovation Solution
A dual-sensor system that measures humidity inside and outside the baling chamber, using polymer sensors to detect capacitance changes without direct contact with the crop material, preventing deposits and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single moisture sensor is placed inside the baling chamber to measure crop moisture, then moisture measurement is achieved, but the sensor becomes contaminated by crop material deposits leading to inaccurate readings
Solution Approach 1:
The sensing system is segmented into two separate sensors: one measuring humidity inside the baling chamber and another measuring ambient humidity outside. This segmentation allows each sensor to operate in its own environment, preventing contamination while maintaining measurement capability through comparative analysis.
Solution Approach 2:
The ambient humidity sensor acts as an intermediary reference that allows the system to compensate for environmental conditions affecting the baling chamber humidity sensor. By comparing readings from both sensors, the system can distinguish between humidity changes caused by crop moisture versus those caused by environmental factors.
2Measurement precision
If the sensor is exposed to the operating environment to measure chamber humidity, then moisture detection is enabled, but crop material deposits accumulate on the sensor surface
Solution Approach 1:
The system separates the sensing function into two independent sensors positioned in different locations. The chamber humidity sensor can be protected from direct crop contact while the ambient sensor operates in clean air, and both contribute to the moisture measurement through comparative analysis.
Solution Approach 2:
The ambient humidity sensor provides a reference copy of environmental conditions that allows the system to compensate for factors affecting the chamber sensor without requiring the chamber sensor to be directly exposed to those conditions.
3Ease of operation
If humidity sensing is used to measure crop moisture, then non-contact measurement is achieved, but environmental humidity conditions affect measurement accuracy
Solution Approach 1:
The system uses feedback from the ambient humidity sensor to compensate for environmental conditions affecting the chamber humidity sensor. By continuously comparing both readings, the controller can distinguish between humidity changes due to crop moisture and those due to environmental factors, maintaining measurement accuracy.
Solution Approach 2:
The ambient humidity sensor serves as an intermediary reference that enables the system to account for environmental conditions without requiring direct contact between the measurement sensor and the crop material, thus preserving both non-contact operation and measurement accuracy.
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
Provides accurate moisture readings independent of environmental conditions and reduces sensor contamination, enabling real-time adjustments and notifications for optimal bale settings.
Implementation Method 1
using polymer sensors to detect capacitance changes without direct contact with the crop material
Data Source
Figure 1A~1D
Figure 2A~2C
Figure 3
AI summary
A device, method, and system for determining a moisture level of for an agriculture machine. receiving crop material in a chamber of the agriculture machine. Determine a humidity of the chamber of the agriculture machine using a first signal of a first sensor of a moisture sensor assembly. The first signal is representative of humidity inside the chamber. Determine a humidity of an operating environment external to the agriculture machine using a second signal of a second sensor of the moisture sensor assembly. The second signal is representative of the humidity of an ambient environment of the agriculture machine. Determine a moisture level of the crop material in the chamber of the agriculture machine using the humidity inside the chamber and the operating environment. Modify operation of the agriculture machine based at least in part on the moisture level of the crop material in the chamber.