Excavation Control System Multi-Surface Speed Limiting
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Solution Overview
Problem
Existing excavation control systems fail to recognize and prevent damage to adjacent designed surfaces during excavation operations, leading to potential damage and inefficient control when working with multiple target surfaces.
Innovation Solution
An excavation control system that includes a working unit with hydraulic cylinders, a prospective speed obtaining part, a speed limit selecting part, and a hydraulic cylinder controlling part, which calculates and applies different speed limits based on the distances between the bucket and multiple designed surfaces to ensure appropriate speed control and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bucket speed is limited relative to a single designed surface, then the excavation precision along that surface is improved, but the system cannot recognize or protect adjacent designed surfaces leading to potential damage
Solution Approach 1:
The control system is designed to calculate prospective speeds for multiple different designed surfaces simultaneously and select the most restrictive speed limit, enabling the single bucket to operate safely relative to multiple surfaces without requiring separate control systems for each surface
2Productivity
If the bucket moves at high speed to improve productivity, then excavation efficiency is improved, but the risk of damaging adjacent designed surfaces increases
Solution Approach 1:
The speed limit is not fixed but dynamically adjusted based on the bucket's proximity to multiple designed surfaces. The system continuously calculates prospective speeds for each surface and selects the most restrictive limit, allowing high speed when safe and automatically reducing speed when approaching any protected surface
Solution Approach 2:
The system continuously monitors the bucket's position relative to multiple designed surfaces, calculates the prospective speed for each surface based on current distance and geometry, and adjusts the speed limit in real-time. This closed-loop feedback ensures productivity is maximized while preventing damage to any surface
3Reliability
If the system calculates speed limits for multiple designed surfaces, then protection of all surfaces is improved, but the computational complexity and control system complexity increases
Solution Approach 1:
The system pre-calculates the geometric relationships and prospective speeds for multiple designed surfaces before excavation begins. By establishing these calculations in advance and using them to determine the speed limit, the system reduces real-time computational complexity while maintaining comprehensive surface protection
Data Source
AI summary
An excavation control system includes a working unit, hydraulic cylinders, a prospective speed obtaining part, a speed limit selecting part and a hydraulic cylinder controlling art. The prospective speed part is configured to obtain a first prospective speed depending on a first distance between the bucket and a first designed surface, and a second prospective speed depending on a second distance between the bucket and a second designed surface. The speed limit selecting part is configured to select one of the first and second prospective speeds as a speed limit based on a relative relation between the first designed surface and the bucket and a relative relation between the second designed surface and the bucket. The hydraulic cylinder controlling part is configured to limit a relative speed of the bucket relative to one of the first and second designed surfaces to the speed limit.