Work Vehicle Revolving Control via External Position Data
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Solution Overview
Problem
Conventional work vehicles, such as hydraulic excavators, face challenges in rapid control due to time-consuming image processing for identifying dumping positions, which can lead to delays and difficulties in recognizing end positions, especially when covered with earth.
Innovation Solution
The implementation of a work vehicle system that receives information about the target object's position externally, allowing for direct control without the need for image processing, and includes sensors and controllers to set and maintain the revolution speed and acceleration based on the object's state and load status, enabling quicker and more reliable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image processing is used to identify the dumping position, then the position can be recognized, but the processing time is excessive and control cannot be performed quickly
Solution Approach 1:
The patent replaces the mechanical image processing system with a communication-based information acquisition system. Instead of using video cameras and image processing algorithms to identify the dumping position, the system directly receives position information from the dumper truck's communication device. This substitution eliminates the time-consuming image processing step while maintaining accurate position recognition.
Solution Approach 2:
The patent introduces a communication device as an intermediary between the dumper truck and the work vehicle. This intermediary directly transmits position information from the dumper truck to the work vehicle's control system, bypassing the need for optical detection and image processing. The communication device acts as a mediator that efficiently transfers the necessary positional data.
2Measurement precision
If image processing is used to identify the end position, then the position can be determined, but it is difficult to recognize when the end position is covered with earth
Solution Approach 1:
The patent replaces the optical-based image processing system with a communication-based information acquisition system. Since the new system receives position information directly from the dumper truck's communication device rather than visually detecting the end position, it is not affected by earth covering the position. This substitution fundamentally resolves the reliability issue.
Solution Approach 2:
The communication device serves as a reliable intermediary that directly transmits the dumper truck's position information to the work vehicle. This intermediary provides accurate position data regardless of visual obstructions, as it relies on the dumper truck's own position information rather than external visual detection.
3Productivity
If the revolving unit revolves quickly to reduce cycle time, then productivity improves, but control precision and stability deteriorate
Solution Approach 1:
The patent implements dynamic control of the revolving unit by adjusting revolution speed based on real-time position feedback. The control system receives accurate position information from the dumper truck and dynamically adjusts the revolution speed to optimize both productivity and stability. This dynamic approach allows faster revolution when appropriate while maintaining precision when needed.
Solution Approach 2:
The patent employs feedback control where the control system continuously receives position information from the dumper truck and adjusts the revolving unit's motion accordingly. This feedback mechanism enables the system to maintain stable control during revolution by comparing actual position with target position and making real-time adjustments, while still achieving high productivity through optimized revolution profiles.
Data Source
AI summary
A work vehicle includes a traveling unit, a revolving unit disposed on an upper side of the traveling unit, a work implement disposed on the revolving unit, a revolving driver that revolves the revolving unit, a receiver, an end position setting component, a revolution position sensor, and a drive controller. The receiver directly or indirectly receives information related to a position of an object serving as a target of a revolution of the revolving unit, from the object. The end position setting component sets an end position of a revolution of the revolving unit based on information related to the position of the object. The revolution position sensor senses a revolution position of the revolving unit during a revolution. The drive controller controls the revolving driver based on the revolution position to revolve the revolving unit from a start position of a revolution to the end position.