Work Vehicle Controller Force Ratio Feedback
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Solution Overview
Problem
Existing work vehicles, particularly wheel loaders, face challenges in balancing traction force and lift force, leading to increased fuel consumption and reduced ease of operation, especially when operated by inexperienced users, as they tend to stall due to improper force distribution.
Innovation Solution
A work vehicle system that includes a traction force detector, lift force detector, and a controller that compares the ratio of traction force to lift force, executing traction force reduction control to maintain a balanced force distribution before the vehicle enters a stalled state, thereby preventing stalling and optimizing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the operator excessively depresses the accelerator to increase traction force during excavation, then the vehicle can press the work implement into the soil, but the vehicle cannot move forward and comes to a stop, reducing ease of operation
Solution Approach 1:
The control unit continuously monitors the ratio between lift force and traction force, and automatically adjusts engine output based on this feedback. When the ratio falls below the threshold (indicating excessive traction force), the system reduces engine output to prevent stalling, thereby maintaining ease of operation without requiring operator skill to balance forces manually.
Solution Approach 2:
The system dynamically changes the engine output parameter based on the calculated force ratio. By comparing the actual lift force to traction force ratio against a predetermined threshold, the control unit adjusts engine parameters (output power) to maintain optimal balance, preventing the vehicle from stalling while preserving operational ease.
2Force
If the vehicle enters a stalled state with excessively high traction force, then the lift force is reduced, but fuel consumption increases due to continuous high engine output
Solution Approach 1:
The system performs preliminary assessment by continuously calculating the lift force to traction force ratio before a stall condition fully develops. When the ratio indicates imbalanced forces (below threshold), the control unit proactively reduces engine output to prevent stalling, thereby avoiding the fuel consumption penalty associated with stalled states while ensuring lift force can be maintained when needed.
3Use of energy by moving object
If the engine output is reduced after the vehicle has entered a stalled state, then fuel consumption is suppressed, but the vehicle readiness and operational efficiency are reduced
Solution Approach 1:
The continuous monitoring of the force ratio provides real-time feedback that enables the control unit to make timely adjustments. By detecting imbalance before stalling occurs, the system can reduce engine output selectively and temporarily, minimizing fuel consumption while maintaining operational efficiency. The system readiness is preserved because the control is proactive rather than reactive.
Data Source
AI summary
An objective of the present invention is to provide a work vehicle and a work vehicle control method that can improve fuel consumption and suppress any decrease in ease of operation. In the work vehicle, the controller compares a predetermined threshold with the ratio between a lift force for raising the work implement and a traction force of the vehicle. The controller executes traction force reduction control for reducing the traction force in the case that an increase in the lift force is required.