Wheel Loader Attachment Tilt Control on Inclined Ground
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Solution Overview
Problem
Existing work machines, such as wheel loaders, struggle to maintain the angle of attachments like buckets or forks when operating on inclined surfaces, as the parallel link control often relies on the vehicle body as a reference, leading to inconsistent bucket angles.
Innovation Solution
A work machine equipped with an attachment tilt angle detection system that controls the tilt angle of attachments relative to the gravity direction, switching between ground-reference and vehicle-body reference controls based on the attachment's posture to maintain a target angle, even on tilted surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple control units are operated independently by different operators, then each operator can control their own functions, but coordination between control units becomes difficult and operational safety deteriorates
Solution Approach 1:
The patent merges multiple independent control units into a single integrated control unit with a unified touchscreen interface. This consolidation allows different operators to share a common control system, enabling real-time coordination while maintaining the ability to control individual functions. The single control unit displays multiple operation screens simultaneously, allowing operators to monitor and adjust different machine functions together, thus improving coordination and operational safety while preserving ease of control.
2Reliability
If a single large control unit is used for all functions, then coordination between control units is improved, but the size and complexity of the control unit increases
Solution Approach 1:
The patent segments the control interface into multiple separate operation screens displayed on a single touchscreen. Each operation screen is dedicated to controlling a specific machine function (e.g., conveyors, crushers, screens). This segmentation allows the control unit to handle multiple functions without becoming physically larger or more complex, as each function has its own organized display area. Operators can switch between or view multiple screens simultaneously, maintaining coordination while keeping the interface manageable and user-friendly.
3Reliability
If important operation data is not recorded, then the control system remains simple, but traceability and analysis of operational issues become impossible
Solution Approach 1:
The control system automatically records operation data without requiring additional manual intervention or complex external systems. The touchscreen controller continuously captures operational parameters, alarm conditions, and maintenance information, storing this data locally. This self-service data recording capability provides full traceability and analysis capability while keeping the system relatively simple, as the recording function is integrated into the existing control unit rather than requiring separate complex data management systems.
Data Source
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AI summary
A wheel loader (1) includes a vehicle body (2), a work implement (3), a bucket-to-ground angle detection section (20), and a control section (9). The work implement (3) operates with respect to the vehicle body (2) and includes a bucket (15) or a fork (19). The bucket-to-ground angle detection section (20) detects information on a tilt angle of the bucket (15) or the fork (19) with respect to a gravity direction G. The control section (9) controls the tilt angle of the bucket (15) or the fork (19) with respect to the gravity direction G based on a detection value of the bucket-to-ground angle detection section (20).