Excavator Bucket Alignment Display for Offset Digging Guidance
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Solution Overview
Problem
Existing display systems for turning work vehicles, which can offset a work machine in a horizontal direction, fail to accurately detect and display the position of a construction work edge, especially in applications like digging side ditches, due to variations in sensor and GPS antenna relations, and require high operator skill.
Innovation Solution
A display system that includes an arithmetic unit to calculate the bucket's position and necessary movements for the revolving superstructure and work machine to align with a side edge of an excavation area, along with a display device showing the positional relationship, and a safety device to prevent collisions, assisting operators in aligning the bucket with the excavation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors and GPS antennas are installed to detect the construction work edge position, then position detection capability is improved, but the detection accuracy deteriorates when the work machine is offset horizontally due to varying relative relations between sensors and the work edge
Solution Approach 1:
The patent introduces a horizontal offset dimension by enabling the work machine to swing left and right relative to the revolving superstructure. This dimensional change allows the work machine to adapt to narrow spaces while the system compensates for the resulting sensor-position variations through coordinate transformation calculations that account for the offset distance and angle.
Solution Approach 2:
The control unit acts as an intermediary that receives position sensor outputs and GPS antenna information, then performs coordinate transformations to calculate the actual construction work edge position. This intermediary processing compensates for the varying relative relations caused by horizontal offset, maintaining detection accuracy despite the work machine's positional changes.
2Measurement precision
If GPS antennas are installed at the construction work edge to improve position detection, then measurement capability is improved, but the reliability deteriorates due to great vibration and impact during work
Solution Approach 1:
The patent extracts the GPS antenna from the construction work edge location and relocates it to the revolving superstructure, which experiences less vibration and impact. This extraction maintains position detection capability by using the control unit to calculate the work edge position based on the antenna's position and the work machine's offset parameters, thereby improving reliability without sacrificing measurement precision.
Solution Approach 2:
The system creates a virtual representation of the construction work edge position through calculation rather than direct physical sensing. The control unit computes the work edge position by transforming coordinates from the GPS antenna position and adding the offset distances, effectively copying the position information without requiring a physical sensor at the vulnerable work edge location.
3Device complexity
If traditional position detection methods are used without considering work machine offset, then device complexity is reduced, but the ease of operation deteriorates as high operator skill is required to manually compensate for offset variations
Solution Approach 1:
The system performs self-service by automatically compensating for work machine offset variations through coordinate transformation calculations. The control unit continuously processes position sensor outputs and GPS information to calculate the actual construction work edge position, eliminating the need for operator intervention to adjust for offset changes and thereby improving ease of operation without significantly increasing device complexity.
Solution Approach 2:
The system implements feedback by continuously monitoring position sensor outputs and GPS antenna information, then using this feedback to calculate and update the construction work edge position in real-time. This closed-loop approach automatically adjusts for work machine offset variations, reducing the skill requirement for operators while maintaining detection accuracy.
4Adaptability or versatility
If the work machine is made capable of horizontal offset to improve workability in narrow spaces, then adaptability is improved, but the difficulty of position detection increases due to varying sensor-work edge relations
Solution Approach 1:
The patent introduces dynamic capability by enabling the work machine to horizontally offset through left-right swinging motion. This dynamic adaptability allows the machine to navigate and work in narrow spaces. The system manages the increased detection difficulty through real-time coordinate transformation calculations that account for the changing offset distance and angle, maintaining position detection accuracy despite the dynamic positioning changes.
Data Source
AI summary
According to the present invention, a display system of a turning work vehicle is used for the turning work vehicle in which a work machine having a bucket 8 can be offset relative to a revolving superstructure in the horizontal direction. The display system includes: an arithmetic unit that calculates the position of the bucket on the basis of a detection result obtained by a position detecting device provided on the turning work vehicle, and calculates a necessary revolving amount of the revolving superstructure and a necessary offset amount of the work machine that are needed to align a side section of the bucket with a side edge of a predetermined excavation area; and a display device that displays the positional relationship between the bucket and the predetermined excavation area.