Round Baler Speed Control Using Torque Feedback
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Solution Overview
Problem
Existing round balers rely on operator experience to manage potential overload situations, lacking precise control over the flow rate of harvested crop, which can lead to inefficient operation and potential damage from excessive loads.
Innovation Solution
A control system using torque sensors on the feeding and forming side of the baler to monitor torque levels, comparing them to optimal values, and adjusting the tractor's speed through a control unit to maintain optimal torque levels, thereby preventing overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tractor speed is increased to maintain even flow rate, then productivity is improved, but the risk of overload increases when processing high density crop
Solution Approach 1:
The system continuously monitors torque from torque sensors on the PTO shaft and feeding side drive means, compares actual torque with maximum permissible torque, and provides feedback to the control unit which then adjusts tractor speed to maintain safe operation while optimizing productivity
Solution Approach 2:
The control system proactively adjusts tractor speed before overload occurs by monitoring torque levels and predicting potential overload situations, allowing the operator to make informed decisions about speed adjustments before damage can occur
2Device complexity
If operator experience is relied upon to manage overload situations, then device complexity is reduced, but measurement precision and control accuracy deteriorate
Solution Approach 1:
The system replaces operator judgment and experience with automated electronic torque sensing and control, using torque sensors, control units, and warning systems to provide precise measurement and control of crop flow rate and power transmission load without requiring operator expertise
3Reliability
If torque monitoring and automated control is implemented, then reliability and measurement precision are improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it receives torque signals from both the PTO shaft sensor and feeding side sensor, processes this data to determine actual torque, compares it with maximum permissible torque, generates warnings, and controls tractor speed adjustment - consolidating multiple control functions into a single integrated system
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
The system provides precise control over the baling process, preventing overload and ensuring efficient operation by adjusting the tractor's speed based on real-time torque measurements, enhancing operator decision-making and reducing mechanical stress.
Implementation Method 1
the feeding side torque sensor measuring a torque of a drive shaft driving a pick up unit of the round baler
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a method of controlling a tractor/baler combination (2, 4), including the steps: (i) advancing the tractor/baler combination through a swath or windrow of crop material with a tractor PTO (78) operating at a constant speed; (ii) during step (i) assessing the flowrate (100) of the harvested crop material in the baler (4) and the torque (102) of the baling chamber drive (iii) comparing (108) the assessed flowrate and torque with an optimal flowrate (104) and an optimal torque (106); and (iv) if at least one of the assessed flowrate or torque differs from the respective optimal parameter by more than a predetermined amount, the speed of advancement of the tractor/baler combination is either increased (110) or decreased (114). Otherwise, the advancement speed is maintained constant (112). This allows the operator of the combination to make better decisions regarding potentially imminent overload situations.