Construction Machine Attachment Speed Control Near Cab
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Solution Overview
Problem
Existing construction machines face challenges in preventing contact between attachments and cabs while maintaining sufficient detection accuracy, often requiring speed limitations of attachments even when they are far apart, which restricts operational efficiency.
Innovation Solution
A construction machine equipped with a posture detector, distance detector, and control apparatus that adjusts the speed of the attachment's distal end portion based on detected postures and distances to prevent interference with the cab, allowing the attachment to operate at a predetermined speed or lower when approaching the cab, thereby ensuring reliable detection and preventing contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distance detector is used to detect the distance from the cab to the attachment, then the detection accuracy is improved, but the speed of the attachment must be suppressed to maintain sufficient detection accuracy
Solution Approach 1:
The monitoring range is divided into two segments: a first monitoring range where the attachment is far from the cab and a second monitoring range where the attachment is close to the cab. The distance detector is only activated when the attachment enters the second monitoring range, allowing high-speed operation in the first range while maintaining detection accuracy in the critical second range.
Solution Approach 2:
The distance detector operates periodically rather than continuously. It is activated only when the attachment enters the second monitoring range (when distance becomes critical) and deactivated when the attachment moves away, reducing operational constraints while maintaining safety.
2Reliability
If the speed of the attachment is limited to ensure detection accuracy, then the detection reliability is improved, but the productivity is reduced
Solution Approach 1:
The monitoring space is segmented into a first monitoring range (farther from cab) and a second monitoring range (closer to cab). Speed limitation is applied only when the attachment enters the second monitoring range, maintaining detection reliability when needed while preserving productivity during normal operation in the first range.
Solution Approach 2:
The speed limitation is dynamic rather than static. The control apparatus adjusts the speed limit based on the attachment's real-time position relative to the cab, allowing high speed when far away and imposing limits only when approaching the critical zone, thus maintaining both reliability and productivity.
3Productivity
If the attachment operates at high speed when apart from the cab, then the productivity is improved, but the detection accuracy deteriorates
Solution Approach 1:
The monitoring range is segmented into two zones: a first monitoring range where high-speed operation is permitted and a second monitoring range where detection accuracy must be maintained. This spatial segmentation allows the attachment to operate efficiently at high speed in the first range while ensuring accurate detection in the critical second range near the cab.
Solution Approach 2:
The control apparatus acts as an intermediary that manages the transition between high-speed operation and accurate detection. It activates the distance detector and imposes speed limits only when the attachment enters the second monitoring range, mediating between the conflicting requirements of productivity and detection accuracy.
Data Source
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AI summary
(i) When it is confirmed that a distal end portion of an attachment (4) has reached a predetermined distance detection start position (B) apart from a cab (14) on the basis of a posture of the attachment (4) detected by posture detector, a control apparatus (32) determines whether or not an object to be detected has reached a predetermined stop position (C) closer to the cab (14) than the distance detection start position (B) on the basis of a distance of the object to be detected by a distance detection sensor (15), and controls the drive unit so as to stop the attachment when determining that the object to be detected has reached the stop position (C), and (ii) the control apparatus (32) controls the drive unit so that the speed of the distal end portion of the attachment (4) becomes a predetermined target speed or lower when the distal end portion of the attachment (4) reaches the distance detection start position (B).