Drive System Pull-Slip Curve Self-Calibration
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Solution Overview
Problem
Existing drive systems for mobile machines, such as dozers and agricultural tractors, face inefficiencies due to the need for continuous calibration and adaptation to changing terrain and ground conditions, leading to potential overload, slip, and reduced productivity, as traditional methods of addressing slip are cumbersome and may not accurately match individual machine performance.
Innovation Solution
A drive system equipped with sensors for travel speed, traction device speed, and torque output, along with a controller that determines slip values and torque output, compares these to stored pull-slip curves, and selectively updates the curves based on real-time data to optimize machine performance and prevent slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional slip control methods are used (manually or autonomously reducing torque after slip detection), then slip can be reduced, but productivity and efficiency are already compromised before control action is taken
Solution Approach 1:
The system performs preliminary calibration to establish machine-specific pull-slip curves before operation, and continuously monitors torque and slip values to predict slip conditions before they occur. This allows the control system to take preventive action rather than reactive action, maintaining productivity while preventing slip damage.
Solution Approach 2:
The system implements continuous feedback by monitoring torque output values and slip values during operation, comparing them against stored pull-slip curves, and automatically adjusting torque to maintain optimal operation. This closed-loop control prevents slip before it occurs while maximizing productivity.
2Measurement precision
If a calibration process is performed during startup to determine pull-slip curves, then machine-specific performance can be captured, but the process is cumbersome and time-consuming
Solution Approach 1:
The system performs self-calibration during normal operation by continuously monitoring torque and slip values and automatically updating the pull-slip curves in memory. This eliminates the need for separate calibration procedures and allows the system to adapt to changing ground conditions in real-time without operator intervention or loss of productivity time.
3Reliability
If stored pull-slip curves are used for control, then slip can be limited, but ground conditions can change dramatically making the curves obsolete
Solution Approach 1:
The system dynamically updates the pull-slip curves during operation based on real-time monitoring of torque and slip values. This allows the control parameters to adapt to changing ground conditions, terrain variations, and machine wear, maintaining optimal slip control accuracy throughout the work shift without requiring manual recalibration.
Data Source
AI summary
A drive system for a mobile machine is disclosed. The drive system may have a travel speed sensor, at least one traction device speed sensor, and a controller in communication with the travel speed sensor and the at least one traction device speed sensor. The controller may be configured to determine a slip value associated with a traction device of the mobile machine based on signals generated by the travel speed sensor and the at least one traction device speed sensor, and determine a torque output value of the mobile machine. The control may also be configured to make a comparison of the slip value and the torque output value with a pull-slip curve stored in memory, and selectively update the pull-slip curve based on the comparison.