Hydraulic Excavator Jack-Up Control Near Construction Target Surface
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Solution Overview
Problem
Machine-controlled hydraulic excavators face challenges in quickly jacking up near a construction target surface, which affects operability and workability, and require accurate control to prevent the bucket from entering the target surface.
Innovation Solution
The hydraulic excavator incorporates a drive controller that determines a target jack-up speed based on the target surface distance and corrects the target operation speed, allowing for quick jacking up near the construction target surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the correction amount of the boom operating speed increases with the length of time that the construction target surface and the bucket are kept apart, then the excavation accuracy is improved, but the jack-up speed becomes slow
Solution Approach 1:
The control system dynamically adjusts the boom operating speed based on real-time detection of the distance between the bucket and construction target surface. When jack-up is detected, the system transitions from a slow correction mode to a fast jack-up mode, making the control characteristics adaptable to different operational phases
Solution Approach 2:
The system changes the control parameter (boom operating speed) based on the detected operational state. By detecting jack-up through posture sensors and distance measurements, the system modifies the speed parameter from a gradually increasing correction speed to a predetermined fast jack-up speed
2Manufacturing precision
If the hydraulic excavator jacks up slowly to maintain excavation accuracy, then the bucket does not enter the construction target surface, but the operability and workability deteriorate
Solution Approach 1:
The system automatically detects jack-up state through posture detectors and distance measurements, and autonomously switches control modes without operator intervention. The control system serves itself by detecting its own operational state and adjusting accordingly
Solution Approach 2:
The control system transitions from static speed correction to dynamic mode switching based on detected operational state, enabling the system to adapt control characteristics to match actual working conditions
3Manufacturing precision
If the bucket is kept apart from the construction target surface for a certain period of time, then the excavation accuracy is improved, but the time required for jack-up increases
Solution Approach 1:
The system employs periodic detection of the distance between the bucket and construction target surface, and based on this periodic measurement, switches control modes appropriately. The continuous monitoring creates a periodic feedback loop that triggers mode transitions
Data Source
AI summary
A hydraulic excavator includes a traveling body, a slewing body, a working front having a boom, an arm, and a bucket, an operation amount detector, a posture detector, a load detector, a drive controller, and a drive unit. The drive controller calculates a target operation speed of the actuator based on the operation amount, the posture of the working front, and the target surface distance so that the bucket excavates along the construction target surface, and determines soil hardness of a place to be excavated based on a result detected by the load detector, corrects the target operation speed based on the soil hardness, and generates a motion command value. The drive controller determines a target jack-up speed when the hydraulic excavator jacks up based on the target surface distance, and corrects the target operation speed based on the determined target jack-up speed.