Adaptive Drive Characteristic Curves for Crane and Excavator Control
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Solution Overview
Problem
Existing control systems for hydraulic components in equipment like cranes and excavators fail to systematically account for changes in operating points due to aging or component replacement, requiring time-consuming and subjective manual adjustments.
Innovation Solution
A control system with a measuring device and control unit that dynamically adjusts or generates new characteristic curves based on deviations between actual and target values, allowing for automatic compensation of changes in the controlled system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment of characteristic curves is performed, then control accuracy can be improved, but time consumption and subjectivity increase
Solution Approach 1:
The control system automatically detects deviations between actual and target values and independently adjusts or regenerates characteristic curves without manual intervention. The control unit monitors system performance continuously and performs self-calibration by modifying stored characteristic curves or generating new ones based on detected deviations, eliminating the need for manual technician adjustments.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where the control unit continuously compares actual measured values against target values, detects deviations, and uses this feedback information to automatically adjust characteristic curves. This feedback-driven approach ensures control accuracy is maintained while eliminating time-consuming manual adjustment processes.
2Measurement precision
If manual adjustment of characteristic curves is performed, then control accuracy can be improved, but subjectivity and variability increase
Solution Approach 1:
The control system performs automatic self-calibration by detecting deviations and independently adjusting characteristic curves without human intervention. This eliminates subjectivity and variability associated with different technicians performing manual adjustments, ensuring consistent and objective control accuracy across all system configurations and operating conditions.
Solution Approach 2:
The patent replaces the manual mechanical adjustment process with an automated electronic control system. The control unit uses electronic sensors to detect deviations and electronically modifies characteristic curves in memory, substituting the subjective human judgment and manual mechanical adjustment with an objective, repeatable electronic control process.
3Measurement precision
If characteristic curves are adjusted manually after component changes, then control accuracy can be maintained, but productivity decreases
Solution Approach 1:
The control system automatically detects component changes through deviation detection and performs self-adjustment of characteristic curves without requiring system shutdown or technician intervention. This maintains control accuracy while allowing the system to remain operational, thereby preserving productivity during adaptation to component changes or aging.
Solution Approach 2:
The system enables continuous operation by performing characteristic curve adjustments dynamically during normal operation rather than requiring shutdown for manual recalibration. The control unit continuously monitors deviations and adjusts characteristic curves in real-time, ensuring both control accuracy and uninterrupted productivity.
Data Source
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AI summary
The invention relates to a working device, in particular a crane or excavator, comprising a drive, a control unit, a measuring device, and a memory. A component of the working device is movable by means of the drive, which can be controlled via the control unit. The measuring device detects an actual value relating to the movement of the driven component. At least one characteristic curve for controlling the drive is stored in the memory. According to the invention, the control unit is configured to determine a control variable for controlling the drive based on a stored characteristic curve and a target value relating to the movement of the component. Furthermore, the control unit is designed to compare the values of the detected actual value and the target value and to detect any deviation between them.Based on the detected deviation, the control unit, according to the invention, can independently adjust the already stored characteristic curve or generate a new characteristic curve and store it in memory. The invention further relates to a method for controlling a drive of such a work device.