Work Vehicle Torque Distribution Control for Variable Excavation Hardness
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Solution Overview
Problem
Existing work vehicles face reduced excavation efficiency when the hardness of the excavation target differs from the previous target, as the distribution ratios of travel and work driving forces are set based on average bucket weight, leading to inefficiencies.
Innovation Solution
A work vehicle with a controller that adjusts the distribution ratios of torques between the work device and travel device based on the reaction force received by the vehicle body, using a microcomputer to control hydraulic cylinders and an electrically driven motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distribution ratios of travel and work driving forces are set based on average bucket weight from previous excavation work, then the control system is simple to operate, but the excavation efficiency decreases when the hardness of the current excavation target differs from the previous target
Solution Approach 1:
The control system uses feedback from the reaction force sensor to dynamically adjust the distribution ratios of travel and work driving forces. The reaction force generated during excavation is detected and fed back to the controller, which automatically modifies the torque distribution between travel and work devices based on the actual excavation conditions, eliminating the need for manual recalibration while optimizing excavation efficiency
Solution Approach 2:
The system transitions from static torque distribution (fixed ratios based on previous work) to dynamic torque distribution (real-time adjustment based on current reaction force). The distribution ratios are continuously modified during excavation operations according to the detected reaction force magnitude, allowing the system to adapt to varying excavation target hardness without operator intervention
2Stability of the object's composition
If the distribution ratio of travel driving force is increased to maintain vehicle position, then the vehicle stability is improved, but the work driving force becomes insufficient and excavation efficiency decreases
Solution Approach 1:
The torque distribution parameters are dynamically adjusted based on reaction force magnitude. When excavation targets require high work force (detected through reaction force), the system automatically increases work driving force ratio while reducing travel driving force ratio, optimizing both vehicle stability and excavation efficiency according to real-time conditions
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
Improves excavation work efficiency by dynamically balancing the travel and work driving forces according to the excavation target's hardness, enhancing penetration and loading efficiency.
Implementation Method 1
a hydraulic pump that is driven by the engine; hydraulic cylinders that are extended and contracted by pressurized fluid delivered from the hydraulic pump
Implementation Method 2
an electrically driven motor that is driven by electric power generated by the engine to operate the travel device
Data Source
AI summary
A work vehicle includes: an engine; a hydraulic pump that is driven by the engine; hydraulic cylinders that are extended and contracted by pressurized fluid delivered from the hydraulic pump; a work device that is moved according to the extension/contraction operations of the hydraulic cylinders; a travel device that is driven independently of the work device; an electrically driven motor that is driven by electric power generated by the engine to operate the travel device; and a controller that controls the hydraulic cylinders and the electrically driven motor. The controller controls the output power of the hydraulic pump and the output power of the electrically driven motor by changing the distribution ratios of a first torque consumed by the work device and a second torque consumed by the travel device among torques output by the engine, on the basis of a reaction force received by the vehicle body.