Excavator Tilt Bucket Control System for Accurate Excavation
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Solution Overview
Problem
In construction machines like excavators, the tilt bucket's tilt angle data acquisition is challenging due to the raising or lowering operations of the boom and arm, leading to decreased excavation accuracy.
Innovation Solution
A construction machine control system with a tilt angle sensor in the bucket, a data acquisition unit, and a data fixing unit that generates fixed data for the work machine control unit, allowing for controlled operation based on fixed data, including dimension and target excavation landform data to ensure accurate positioning and speed limits during excavation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tilt bucket is used to enhance excavation flexibility, then adaptability is improved, but measurement precision deteriorates due to difficulty in acquiring accurate tilt angle data during boom and arm operations
Solution Approach 1:
The system performs preliminary actions by detecting boom and arm movement intentions before they affect tilt angle measurements, then proactively fixes the tilt angle data to prevent measurement errors. The control unit predicts when tilt angle data may become inaccurate due to upcoming boom/arm movements and preemptively freezes the data, ensuring continuous availability of accurate tilt angle information for excavation control.
2Measurement precision
If tilt angle data is continuously updated to reflect real-time bucket position, then measurement precision is improved, but reliability deteriorates when boom or arm operations cause inaccurate readings
Solution Approach 1:
The system implements feedback by continuously monitoring boom and arm movement states and using this information to control when tilt angle data should be fixed or updated. The control unit receives feedback from movement detection units about boom and arm positions, then uses this feedback to determine whether to freeze or update tilt angle data, ensuring data reliability while maintaining measurement precision during stable operations.
3Measurement precision
If the tilt angle sensor is made more sensitive to detect precise bucket tilt, then measurement precision is improved, but difficulty of detecting and measuring worsens due to interference from boom and arm movements
Solution Approach 1:
The control unit acts as an intermediary between the tilt angle sensor and the excavation control system. It receives sensitive tilt angle measurements from the sensor, then uses intermediary logic to determine when to trust and use these measurements versus when to fix previously acquired data. This intermediary processing layer protects the control system from using inaccurate measurements while preserving the benefits of high sensor sensitivity during stable measurement conditions.
Data Source
AI summary
A control system controls a construction machine that includes a work machine including a bucket having a plurality of tilting mechanisms. The control system includes: a tilt angle sensor that is provided in the bucket so as to detect tilt angle data including a rotation angle of the bucket about the tilt shaft, the tilt angle sensor being capable of detecting an inclination angle with respect to a horizontal plane; a data acquisition unit to which the tilt angle data is output from the tilt angle sensor; a data fixing unit that fixes the tilt angle data output to the data acquisition unit based on a fixing command to generate fixed data; and a work machine control unit that controls the work machine based on the fixed data until the fixing command is disabled.