Loading Machine Work Tool Posture Control to Prevent Spillage
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Solution Overview
Problem
Existing control systems for loading machines, such as wheel loaders, fail to appropriately determine the target posture of the work tool, leading to potential spillage of excavated material when the work tool is in a loaded state due to automatic posture changes.
Innovation Solution
A control system and method that includes a controller to determine the presence or absence of a load in the work tool, and based on this determination, automatically adjust the target posture of the work tool to either a holding or excavating posture, using sensors and a programmable logic to control the movable support parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the posture of the work tool is automatically changed to the excavation posture in response to the operation of lowering the work tool, then the operation is labor-saving, but the excavated material may spill out inappropriately when the work tool is in a loaded state
Solution Approach 1:
The control system continuously monitors the load state of the work tool through sensors (such as hydraulic pressure sensors or load cells) and uses this feedback information to dynamically adjust the automatic posture control. When a load is detected, the system suppresses automatic posture changes that would cause spillage, while allowing automatic excavation posture changes when the tool is empty, thus resolving the contradiction between automation and material stability
Solution Approach 2:
The system transitions from a static automatic posture control mode to a dynamic mode that adapts based on real-time load conditions. The control parameters and target postures are dynamically adjusted according to the detected load state, enabling the system to optimize between labor-saving automation and preventing material spillage under varying operational conditions
2Manufacturing precision
If the operation lever is tilted until the tilted state is maintained, then a work tool can be moved to a predetermined height and automatically stopped, but control signals continue to be output even if the operator releases the operation lever
Solution Approach 1:
The system uses the automatic posture control function to serve multiple purposes: it not only achieves precise positioning of the work tool but also automatically manages the return to excavation posture when appropriate. This self-service approach eliminates the need for additional complex signal generation mechanisms while maintaining positioning precision and adding intelligent load-based decision-making
Data Source
AI summary
A loading machine has work equipment including a work tool and a movable support part configured to change a posture of the work tool. A control system for the loading machine includes a controller configured to determine presence or absence of a load, and a target work equipment posture indicating a target posture of the work tool based on a determination result of the presence or absence of the load.