Construction Equipment Swing Body Speed Control via Feedback
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Solution Overview
Problem
The control performance of swing bodies in construction equipment, such as hybrid excavators, heavily relies on the operator's capability, leading to inefficiencies and potential errors due to the lack of precise control mechanisms.
Innovation Solution
A method and apparatus that utilize a representative signal vs. speed curve to generate commands for the swing motor, adjusting rotational speed based on reference values and real-time feedback, allowing for accurate control without additional displacement sensors, thereby accounting for changes in inertia and improving operator handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hydraulic swing motor is used to drive the swing body, then the swing body can be driven with simple structure, but the control performance depends heavily on the operator's capability and lacks precise control
Solution Approach 1:
The patent implements a feedback control system where a speed sensor detects the actual rotational speed of the swing motor, and the controller compares this with the reference speed to generate corrective control signals. This closed-loop feedback mechanism enables precise control performance without increasing the fundamental hydraulic system structure, resolving the contradiction between simple structure and controllable operation.
2Device complexity
If the operator controls the swing speed by manipulating the joystick while looking at it, then no additional sensors are needed, but the control accuracy is low and depends on operator capability
Solution Approach 1:
The patent replaces the operator's visual-mechanical control method with an automated electronic control system. A speed sensor electronically detects rotational speed, and a controller processes this data to automatically adjust the swing motor speed, substituting the operator's manual control with an automated system that provides precise measurement and control without requiring the operator to visually monitor the swing speed.
3Ease of operation
If a speed sensor and controller are added to achieve precise swing speed control, then control accuracy improves, but device complexity increases
Solution Approach 1:
The control system is designed to be self-regulating through automatic feedback control. The speed sensor continuously monitors the swing motor speed, the controller automatically compares actual speed with reference speed, and the system self-corrects any deviations without requiring external intervention or complex additional components. This self-service mechanism achieves precise control while minimizing the increase in system complexity.
Data Source
AI summary
Exemplary embodiments relate to controlling a swing body of construction equipment. Disclosed methods may include selecting a representative signal vs. speed curve, receiving an operating signal value from the operating input device, obtaining a reference speed value by applying said operating signal value to the selected curve, transmitting a command for rotational speed equivalent to said reference speed to the swing motor making the swing body rotate, obtaining rotational speed of said motor, determining whether a value obtained by subtracting rotational speed from reference speed exceeds the maximum permissible errors, obtaining a new signal vs. speed curve equivalent to rotational speed when a value obtained by subtracting rotational speed from reference speed exceeds the maximum permissible errors, obtaining a new reference speed value from an operating signal value using said new curve, and transmitting a new command for rotational speed equivalent to said new reference speed to said motor.