Excavator Control Device Maintaining Arm Speed on Slopes
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Solution Overview
Problem
Existing excavator control systems struggle to maintain a consistent moving speed of the work part along a target construction surface, especially when the surface includes steep and gentle slope portions or horizontal surfaces, leading to operator discomfort due to significant speed changes.
Innovation Solution
A control device for an excavator that includes circuitry to operate the arm and adjust the boom or end attachment to maintain a predetermined moving speed of the control target along the target surface, regardless of the surface's slope or orientation, by controlling the arm and boom operations based on the arm operation lever's input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the excavator operates the arm to move the work part along the target surface, then the work part can be positioned accurately, but the moving speed varies significantly between steep slope portions and gentle slope portions or horizontal surfaces
Solution Approach 1:
The control device detects the actual moving speed of the work part and compares it with the target speed. Based on the speed deviation, the control device adjusts the arm operation command values to compensate for speed variations caused by different surface slopes, thereby maintaining consistent moving speed while preserving positioning accuracy
Solution Approach 2:
The control device changes the operation command values for the arm based on the detected surface slope and current operating conditions. By adjusting the command values dynamically according to the slope parameters, the system maintains consistent work part speed across different terrain conditions
2Ease of operation
If the arm operation lever is operated with the same operation amount for both steep and gentle slope portions, then the operator's input is simplified, but the work part moving speed becomes inconsistent across different surface types
Solution Approach 1:
The system continuously monitors the actual speed of the work part and feeds this information back to the control device. The control device then automatically adjusts the arm operation based on the feedback signal, compensating for speed variations without requiring the operator to modify their input effort
Solution Approach 2:
The control system automatically compensates for speed variations caused by different surface slopes without requiring additional operator intervention. The system serves itself by detecting the slope conditions and autonomously adjusting the arm operation to maintain consistent work part speed
Data Source
AI summary
A control device for an excavator is provided, wherein the excavator includes a lower traveling body; an upper slewing body slewably mounted on the lower traveling body; and an attachment attached to the upper slewing body, the attachment including a boom, an arm, and an end attachment. The control device includes circuitry configured to operate the arm in response to a command value so as to move a predetermined work part of the end attachment while aligning the predetermined work part with a target surface, and to operate at least one of the boom or the end attachment in accordance with the operation of the arm, wherein the circuitry controls the operation of at least one of the arm or the boom such that a moving speed of a control target along the target surface becomes a predetermined speed, the control target being a predetermined part of the attachment.