Excavator Facing Control Through Angle-Based Turning Speed
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Solution Overview
Problem
Existing excavators face challenges in accurately positioning the upper turning body to directly face a target work surface, affecting work accuracy and efficiency.
Innovation Solution
An excavator system that includes sensors and a control device to monitor and adjust the turning speed of the upper and lower bodies based on the required turning angle, using a controller to ensure precise alignment with a target work surface, and providing visual and auditory feedback to the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If facing control is performed by applying turning force to the lower traveling body or upper turning body, then the upper turning body can face the target work surface, but the turning speed may be too high causing the upper turning body to pass the facing position
Solution Approach 1:
The control device dynamically adjusts the turning speed based on the turning angle required for facing control. When the turning angle is large, the turning speed is set higher to improve efficiency; when the turning angle is small, the turning speed is reduced to prevent passing the facing position. This dynamic speed adjustment resolves the contradiction between maintaining high turning speed and achieving precise facing accuracy.
Solution Approach 2:
The system changes the turning speed parameter according to the turning angle parameter. By establishing a relationship between these two parameters, the control device optimizes the turning speed for each specific facing scenario, thereby improving both facing accuracy and operational efficiency without requiring manual speed control adjustments.
2Productivity
If the turning speed is increased to improve work efficiency, then productivity increases, but the accuracy of positioning the upper turning body deteriorates
Solution Approach 1:
The turning speed is not fixed but dynamically adjusted based on the turning angle. For large turning angles, higher speeds maintain productivity; for small turning angles, lower speeds ensure positioning accuracy. This dynamic adjustment eliminates the need to choose between speed and accuracy, allowing both to be optimized simultaneously.
Solution Approach 2:
The control device establishes a functional relationship between turning speed and turning angle, automatically selecting appropriate speed parameters for different positioning scenarios. This parameter change strategy enables the system to maintain high productivity while achieving precise positioning by adapting the speed parameter to each specific work condition.
Data Source
AI summary
An excavator includes a lower traveling body; an upper turning body mounted on the lower traveling body in a turnable manner; and a control device configured to perform facing control such that the upper turning body faces a target work surface, by applying a turning force to the lower traveling body or the upper turning body to turn the lower traveling body or the upper turning body. The control device controls a turning speed of the lower traveling body or the upper turning body based on a turning angle required for the upper turning body to face the target work surface.