Work Vehicle Propulsion Control for Auxiliary Tool Load Management
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Solution Overview
Problem
Work vehicles with auxiliary tools face increased load variations due to ground density and material changes, leading to potential overload and undesirable performance of the auxiliary work tool when traversing uneven terrain.
Innovation Solution
A method and system for controlling the propulsion of work vehicles, which involves determining an auxiliary work tool load threshold based on prime mover speed and propulsion speed, and adjusting the propulsion speed to prevent overload by reducing it when the load exceeds the threshold, while maintaining prime mover speed if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the work vehicle propels at high speed to improve productivity, then the auxiliary work tool load increases significantly, but the auxiliary work tool performance deteriorates due to overload
Solution Approach 1:
The system dynamically adjusts the propulsion speed based on real-time auxiliary work tool load conditions. The controller continuously monitors the auxiliary work tool load and modifies the propulsion speed accordingly, transitioning from a static fixed-speed operation to a dynamic adaptive-speed operation that responds to changing ground conditions and tool loads
Solution Approach 2:
The system implements a feedback control mechanism where the controller receives information about the auxiliary work tool load and uses this feedback to adjust the propulsion speed. This closed-loop control ensures that the propulsion speed is continuously optimized based on the actual load conditions, preventing overload while maintaining efficient operation
2Reliability
If the propulsion speed is reduced to prevent auxiliary work tool overload, then the auxiliary work tool load is controlled within safe limits, but the work vehicle productivity decreases
Solution Approach 1:
Rather than using a fixed reduced speed, the system employs dynamic speed adjustment that adapts to real-time conditions. The propulsion speed is continuously modified based on the auxiliary work tool load, allowing the vehicle to operate at higher speeds when conditions permit and reduce speed only when necessary to prevent overload
Solution Approach 2:
The system changes the propulsion speed parameter dynamically based on the auxiliary work tool load conditions. By adjusting this key operational parameter in response to real-time feedback, the system optimizes both the reliability of the auxiliary work tool and the overall productivity of the work vehicle
3Productivity
If the auxiliary work tool load threshold is set high to maintain productivity, then the work vehicle can operate at higher speeds, but the risk of auxiliary work tool overload increases
Solution Approach 1:
The feedback control mechanism continuously monitors the auxiliary work tool load and compares it against safe operating thresholds. When the load approaches or exceeds the threshold, the system automatically reduces propulsion speed, creating a dynamic safety mechanism that adapts to changing conditions while maintaining productivity when conditions are favorable
Solution Approach 2:
The system takes preliminary action by reducing propulsion speed before the auxiliary work tool load reaches dangerous overload levels. This preventive approach anticipates potential overload conditions and counteracts them by adjusting speed in advance, preventing harmful effects before they occur
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 approach prevents overload and undesirable performance of the auxiliary work tool, improving operator control, reducing fatigue, and enhancing the efficiency and performance of the work vehicle by automatically adjusting propulsion speed based on load conditions.
Implementation Method 1
determining the auxiliary work tool load comprises sensing a hydraulic pressure of a hydraulic circuit connected to the auxiliary work tool
Data Source
AI summary
A work vehicle and a method of controlling propulsion of a work vehicle includes an auxiliary work tool. The method includes receiving a propulsion input for propelling the work vehicle at a propulsion speed, determining a prime mover speed for a prime mover configured to propel the work vehicle, propelling the work vehicle with a prime mover output based on the propulsion input, operating the auxiliary work tool while propelling the work vehicle, determining an auxiliary work tool load from operation of the auxiliary work tool, determining whether the auxiliary work tool load of the auxiliary work tool exceeds an auxiliary work tool load threshold, and reducing the propulsion speed of the work vehicle if the auxiliary work tool load of the auxiliary work tool exceeds the auxiliary work tool load threshold.