Work Vehicle Loader Control Using Closed-Loop Feedback
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Solution Overview
Problem
Existing control systems for work vehicles' lift assemblies lack accuracy in moving loader arms and implements to pre-defined positions, often resulting in under-shooting or over-shooting due to the use of simple open-loop control algorithms.
Innovation Solution
A method and system that utilize closed-loop velocity and position control algorithms to accurately move loader arms and implements by transmitting command signals based on the position relative to defined thresholds, adjusting velocity to ensure precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple open-loop control algorithms are used, then the control system is simple and easy to implement, but the positioning accuracy of loader arms and implement deteriorates, resulting in under-shooting or over-shooting
Solution Approach 1:
The patent implements closed-loop feedback control by continuously monitoring the actual position of loader arms and implement, comparing it with the desired pre-defined position, and adjusting control commands based on the position error. This feedback mechanism eliminates under-shooting and over-shooting issues while maintaining reasonable system complexity.
Solution Approach 2:
The control system dynamically adjusts control parameters and command signals based on real-time position feedback. The system transitions from static open-loop control to dynamic closed-loop control, adapting control strength according to the distance from target position to achieve precise positioning without excessive complexity.
2Manufacturing precision
If closed-loop velocity and position control algorithms are used, then positioning accuracy improves, but device complexity increases
Solution Approach 1:
The control algorithm is segmented into distinct functional modules: velocity control sub-algorithm for motion regulation and position control sub-algorithm for precise positioning. This segmentation allows each module to be optimized independently while working together to achieve high positioning accuracy without overwhelming system complexity.
Solution Approach 2:
The control system performs preliminary velocity control before final position control. By first using velocity control to bring the loader arms and implement close to the target position, then switching to position control for precise alignment, the system achieves high accuracy while managing computational complexity through staged control actions.
Data Source
AI summary
A method for automatically controlling the operation of a lift assembly of a work vehicle may generally include receiving an input associated with moving loader arms and/or an implement of the lift assembly to a pre-defined position and monitoring a position of the loader arms and/or the implement relative to the pre-defined position. In addition, while a reference point associated with the loader arms and/or the implement is located outside an outer threshold boundary associated with the pre-defined position, the method may include transmitting a first command signal(s) to move the loader arms and/or the implement towards the pre-defined position. Moreover, when the reference point is moved within the outer threshold boundary, the method may include transmitting a second command signal(s) in order to ramp down a movement velocity of the loader arms and/or the implement as the loader arms and/or the implement is moved closer to the pre-defined position.