Automatic Cut Height Adjustment for Forage Harvesters
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Solution Overview
Problem
Operators of forage harvesters face challenges in adjusting the cut height of front harvesting attachments optimally, balancing yield, stubble length, and forage quality, while also dealing with contaminant-induced wear and the demands of plowless farming, which current technologies do not adequately address.
Innovation Solution
The cut height of the front harvesting attachment is automatically controlled based on measured plant characteristics using a sensor, such as an optical sensor operating in the near infrared region, which detects constituents like protein, nitrogen, or contaminants, allowing the controller to adjust the height to achieve desired quality and minimize contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cut height is lowered to increase yield and reduce stubble length for plowless farming, then productivity is improved, but the quality of forage production deteriorates due to increased ground particles and contaminants
Solution Approach 1:
The system continuously measures plant characteristics (protein content, nitrogen content, contaminant levels) using sensors in the material flow and feeds this information back to the control arrangement, which automatically adjusts the cut height to maintain optimal forage quality while maximizing yield. This closed-loop feedback mechanism resolves the contradiction by dynamically adapting cut height based on real-time quality measurements.
Solution Approach 2:
The system changes the cut height parameter dynamically based on measured plant characteristics. When contaminants are detected at high levels, the system increases cut height to reduce contaminant intake; when plant quality is high, it lowers cut height to maximize yield. This parameter adaptation allows the system to optimize both productivity and quality simultaneously.
2Object-affected harmful factors
If the cut height is manually adjusted to optimize forage quality, then the quality of mass production is improved, but the work load on the operator increases and inexperienced operators cannot deliver optimum results
Solution Approach 1:
The system performs self-adjustment of cut height based on automatic measurement of plant characteristics. The control arrangement independently processes sensor data and actuates the adjustment mechanism without requiring operator intervention, thereby reducing work load and eliminating the skill requirement for manual adjustment while maintaining optimal forage quality.
Solution Approach 2:
The system replaces manual mechanical adjustment with an automated control system that uses sensors to detect plant characteristics and actuators to adjust cut height. This substitution eliminates the need for operator skill and physical intervention, making the system easier to operate while maintaining quality optimization.
3Length of moving object
If the cut height is reduced to minimize stubble length for plowless farming, then the stubble length is reduced, but the wear of cutting tools and machine components increases due to ground particles
Solution Approach 1:
The system measures plant characteristics including contaminant levels in real-time and uses this feedback to dynamically adjust cut height. When ground particles or contaminants are detected at high concentrations, the system automatically increases cut height to reduce tool wear, while maintaining short stubble length when conditions permit. This feedback mechanism resolves the contradiction between stubble length and tool wear.
4Extent of automation
If sensors are added to measure plant characteristics for automatic cut height adjustment, then the automation of cut height control is improved, but the device complexity increases
Solution Approach 1:
The sensor system is designed to measure multiple plant characteristics (protein content, nitrogen content, contaminant levels) simultaneously using a single integrated sensing arrangement. This multi-functionality reduces the need for multiple separate sensors and measurement systems, thereby limiting the increase in device complexity while achieving comprehensive automatic control.
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
This solution simplifies the adjustment process for operators, reduces workload, and ensures high-quality forage production by automatically optimizing the cut height based on real-time plant analysis, thereby improving the efficiency and quality of the harvesting process.
Implementation Method 1
an optical sensor that preferably operates in the near infrared region in reflection or transmission mode
Implementation Method 2
an optical sensor that preferably operates in the near infrared region in reflection or transmission mode
Data Source
AI summary
An arrangement for the automatic adjustment of the cut height of a front harvesting attachment on a harvesting machine for the harvesting of stalk-like plants. A controller is connected to a sensor and to an actuator that can adjust the cut height of the front harvesting attachment based on the detection by the sensor of at least one characteristic of the harvested crop material and can be repositioned as a function of the signal of the sensor.