Construction Equipment Bucket Speed Control at Work Boundaries
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Solution Overview
Problem
Existing construction equipment, such as excavators, face inefficiencies in work speed and efficiency due to uniform speed limitations based on the shortest distance between the bucket end and the work area, which do not account for varying bucket postures, leading to unnecessary speed restrictions and decreased productivity.
Innovation Solution
A construction equipment system with a work area limit function that controls the speed of the bucket by calculating the distance from the bucket end to the work area in the direction of movement, using an electronic control unit to adjust speed limits based on real-time location and posture, allowing for dynamic speed adjustments to prevent intrusion into the work area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed of the bucket is limited based on the shortest distance between the bucket end and the work area, then the bucket will not intrude into the work area, but the work speed and efficiency decrease due to unnecessary speed restrictions
Solution Approach 1:
The patent applies local quality by differentiating speed control based on the specific spatial relationship between the bucket end and work area. Instead of using a uniform speed limit for all bucket positions, the system calculates the distance in the speed direction and applies appropriate speed restrictions only when necessary, allowing full speed when the bucket is safely positioned. This localized approach resolves the contradiction by maintaining reliability through precise boundary control while improving productivity by eliminating unnecessary speed limitations.
Solution Approach 2:
The patent implements dynamics by making the speed control adaptive and variable rather than fixed. The electronic control unit dynamically adjusts the bucket speed based on real-time calculation of the distance from the bucket end to the work area in the speed direction. This dynamic speed adjustment allows the system to maintain work area boundaries while optimizing work speed according to actual operational conditions, resolving the contradiction between reliability and productivity.
2Reliability
If the speed of the bucket is limited uniformly for all bucket postures, then the work area boundary is protected, but work efficiency decreases due to not considering varying bucket positions
Solution Approach 1:
The patent applies local quality by differentiating speed control based on the specific spatial relationship between the bucket end and work area. Instead of using a uniform speed limit for all bucket positions, the system calculates the distance in the speed direction and applies appropriate speed restrictions only when necessary, allowing full speed when the bucket is safely positioned. This localized approach resolves the contradiction by maintaining reliability through precise boundary control while improving productivity by eliminating unnecessary speed limitations.
Solution Approach 2:
The patent implements parameter changes by varying the speed control parameter based on the bucket's operational state and position. The electronic control unit changes the speed parameter dynamically according to the calculated distance from the work area, allowing different speed levels for different bucket postures and conditions. This parameter adaptation resolves the contradiction by maintaining boundary protection while optimizing work efficiency for each specific operational scenario.
3Device complexity
If the shortest distance between bucket end and work area is used for speed control, then the control is simple, but it does not account for varying bucket postures leading to unnecessary speed restrictions
Solution Approach 1:
The patent applies another dimension by transitioning from simple shortest-distance control to three-dimensional spatial relationship analysis. The system calculates the distance in the speed direction, considering the bucket's posture and orientation, which adds a dimensional aspect to the control approach. This dimensional enhancement resolves the contradiction by maintaining relatively simple control architecture while significantly improving work efficiency through more accurate and context-aware speed management.
Solution Approach 2:
The patent replaces simple mechanical distance measurement with electronic control and calculation systems. The electronic control unit processes location information and calculates the distance in the speed direction, substituting basic mechanical control with intelligent electronic computation. This substitution resolves the contradiction by maintaining control simplicity while enabling posture-aware speed management that improves productivity.
Data Source
AI summary
A construction equipment includes a lower traveling body, an upper swing body on the lower traveling body, a work device comprising a boom, an arm, and a bucket moved by respective hydraulic cylinders and supported by the upper swing body, a control valve for controlling the hydraulic cylinder, an operation lever for outputting an operation signal, a work setting unit for setting and/or selecting the work area of the work device, a location information provision unit, and an electronic control unit (ECU). The ECU calculates the distance between the work area and the work device and controls the speed of the work device on the basis of the calculated distance. The ECU sets the speed limit range and/or speed reducing rate on the basis of the shortest distance between the bucket end and the work area in a reference bucket pin location.