Tilting Bucket Excavation Control via 3D Position Calculation
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Solution Overview
Problem
Construction machines with tilting buckets face challenges in maintaining excavation accuracy due to difficulties in accurately determining the position of the blade edge as the tilt angle changes, leading to potential degradation in excavation precision.
Innovation Solution
A control system that acquires and processes dimension data, external shape data, and angle data to calculate two-dimensional bucket data, allowing for precise positioning and control of the bucket relative to the target excavation landform, thereby preventing accuracy degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tilting bucket is used to increase excavation flexibility, then the adaptability of the work machine is improved, but the measurement precision of the blade edge position deteriorates
Solution Approach 1:
The patent transitions from two-dimensional bucket position calculation to three-dimensional calculation by incorporating tilt angle data. The calculation unit computes the blade edge position in 3D space by combining bucket angle data with tilt angle data, then projects this position onto the work machine operation plane. This dimensional extension resolves the measurement accuracy problem while preserving tilt functionality.
Solution Approach 2:
The patent replaces direct mechanical measurement of blade edge position with a computational approach. Instead of using mechanical sensors to directly measure the blade edge position, the system uses calculation units that process dimension data, external shape data, work machine angle data, and tilt angle data to compute the position mathematically. This substitution maintains measurement precision while enabling bucket tilting.
2Adaptability or versatility
If bucket tilt angle changes to adapt to different excavation conditions, then the versatility of the construction machine is improved, but the excavation accuracy deteriorates due to inability to accurately obtain blade edge position
Solution Approach 1:
The patent implements a feedback mechanism where the calculation unit continuously processes real-time tilt angle data and work machine angle data to update the blade edge position calculation. This closed-loop approach ensures that excavation accuracy is maintained by constantly adjusting the calculated position based on current tilt and angle measurements, allowing the system to adapt to different excavation conditions while preserving precision.
Solution Approach 2:
The patent changes the parameters used for position calculation from static dimension data alone to dynamic parameters including tilt angle data and work machine angle data. By incorporating these changing parameters into the calculation, the system maintains excavation accuracy across varying operating conditions while preserving the adaptability benefits of bucket tilting.
3Measurement precision
If multiple data acquisition and calculation processes are implemented to maintain accuracy with tilting buckets, then the excavation precision is preserved, but the device complexity increases
Solution Approach 1:
The patent implements a multi-functional calculation unit that handles multiple data types (dimension data, external shape data, work machine angle data, tilt angle data) and performs multiple calculation tasks (blade edge position calculation, relative position calculation, target excavation landform comparison). This universal approach consolidates what could be separate complex subsystems into a single integrated unit, preserving measurement precision while minimizing the increase in device complexity.
Data Source
AI summary
A control system controls a construction machine having a work machine including a tilting bucket. The control system includes: a first acquisition unit configured to acquire dimension data; a second acquisition unit configured to acquire external shape data of the bucket; a third acquisition unit configured to acquire target excavation landform data indicating a target excavation landform that is a two-dimensional target shape of an excavation object on a work machine operation plane perpendicular to a bucket axis; a fourth acquisition unit configured to acquire work machine angle data; a fifth acquisition unit configured to acquire tilt angle data indicating a turning angle of the bucket; and a calculation unit configured to obtain two-dimensional bucket data indicating an external shape of the bucket on the work machine operation plane on the basis of the dimension data, the external shape data, the work machine angle data, and the tilt angle data.