Working Arm Carriage Oscillation Control for Hydraulic Attachments
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Solution Overview
Problem
In electro-hydraulic systems of working machines, operators face challenges in achieving desired frequency and amplitude of oscillation for attachments due to latency and lack of direct linkage to hydraulic control valves, making it difficult to shake attachments effectively.
Innovation Solution
A control system with an electronic controller and user input device, such as a joystick, that allows for variable frequency and amplitude oscillations of the carriage, using oscillation and position signals to activate actuators, enabling precise and repeatable oscillations of the attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electro-hydraulic systems are used to control the attachment, then the system automation and control precision are improved, but the operator cannot easily achieve desired frequency and amplitude of oscillation due to latency and lack of direct linkage
Solution Approach 1:
The patent introduces an electronic controller as an intermediary between the user input device and the hydraulic actuator. The electronic controller receives oscillation signals from the user input device, processes them to determine desired frequency and amplitude, and then activates the actuator accordingly. This intermediary resolves the latency issue by providing a controlled signal transmission path that maintains precision while enabling ease of operation through variable oscillation parameters.
2Ease of operation
If manual joystick movement is used to shake the attachment, then the operator can control the attachment position, but the oscillation frequency and amplitude cannot be easily adjusted in electro-hydraulic systems
Solution Approach 1:
The patent makes the oscillation parameters dynamic by allowing the user input device to be positioned at different locations along the oscillation signal transmission path. The electronic controller dynamically adjusts the oscillation frequency and amplitude based on the position of the user input device, enabling the system to adapt to different operational requirements while maintaining ease of control through the same joystick interface.
3Speed
If the oscillation signal is directly transmitted from the user input device to the actuator, then the response time is improved, but the oscillation frequency and amplitude cannot be precisely controlled
Solution Approach 1:
The patent implements a feedback mechanism where the electronic controller continuously monitors the position of the user input device and adjusts the oscillation parameters accordingly. The controller receives the oscillation signal, processes it to determine the desired frequency and amplitude based on input device position, and provides feedback to the actuator to achieve precise control while maintaining rapid response through the direct electro-hydraulic connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows for easy and repeatable oscillation of attachments at desired frequencies and amplitudes without requiring operator skill, reducing operator fatigue and enhancing usability, while providing safety features like neutral position detection.
Implementation Method 1
an actuator configured and arranged to selectively oscillate the carriage; an electronic controller configured to control the actuator
Data Source
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AI summary
A working machine (10) comprising a ground engaging structure (12) and a propulsion system for moving the working machine (10) via the ground engaging structure (12). A body (14) is supported on the ground engaging structure (12), and a working arm (16) is connected to the body (14) and has a carriage at one end for receiving an attachment (18). A control system is provided for selectively and variably oscillating the carriage (17).