Wheel Loader Excavation Feedback for Stall and Slip Detection
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Solution Overview
Problem
Wheel loaders experience significant fuel inefficiency due to prolonged excavation times, largely attributed to ineffective operations that prolong the time needed to complete excavation tasks.
Innovation Solution
A work machine system equipped with a controller that identifies and notifies the operator of ineffective operations during excavation, such as work implement stall and slip-during-excavation, allowing for immediate corrective action to reduce ineffective operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operator performs excavation operations without real-time feedback on ineffective operations, then the operation continues normally, but the excavation time period is prolonged due to ineffective operations such as work implement stall and slip
Solution Approach 1:
The controller provides real-time feedback to the operator by displaying ineffective operation information on a display device. The system monitors operation command values from the operation apparatus and compares them with actual work implement performance, then notifies the operator of ineffective operations such as work implement stall and slip during excavation, enabling immediate corrective action to reduce ineffective operation time and improve excavation productivity
2Productivity
If the operator is notified of ineffective operations in real-time, then corrective action can be taken immediately, but the system complexity increases due to the need for monitoring and notification mechanisms
Solution Approach 1:
The controller performs multiple functions: it controls the work implement operation, monitors operation command values from the operation apparatus, determines whether ineffective operations are occurring by comparing commands with actual performance, and provides notifications to the operator. By integrating these functions into a single controller, the system achieves the productivity improvement without proportionally increasing overall system complexity
Solution Approach 2:
The system automatically monitors and detects ineffective operations by itself using the existing operation apparatus and controller resources, without requiring separate complex monitoring systems. The controller utilizes its existing computational capabilities to analyze operation data and generate notifications, making the system self-sufficient in detecting and reporting ineffective operations
Data Source
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AI summary
A time period for which an ineffective operation is performed during an excavation work is reduced. A work machine includes a vehicular body, a running wheel rotatably attached to the vehicular body, a work implement operable with respect to the vehicular body, an operation apparatus for operating the running wheel and the work implement, and a controller that controls an operation by the work machine. The controller determines that an ineffective operation in which the work implement does not work is being performed during the excavation work based on an operation command value output from the operation apparatus and notifies an operator of occurrence of the ineffective operation.