Operator Interface Tactile Feedback Joystick
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Solution Overview
Problem
Operators of machinery face difficulties in controlling fine movements of implements due to the lack of tactile feedback from electrically actuated valve control systems, which do not provide the expected resistance and feedback necessary for precise operations.
Innovation Solution
An operator interface assembly that includes a base, an operator input device, first and second biasing members, and an electronic position sensor, where the biasing members provide distinct resistance levels and the position sensor generates signals for controlling machine functions, enabling tactile feedback and precise control of implement movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electrically actuated valve control is used, then automation and response speed are improved, but tactile feedback and operator control precision deteriorate
Solution Approach 1:
A mechanical feedback linkage is introduced as an intermediary between the electrical valve control system and the operator's joystick input device. This linkage transmits tactile feedback forces from the valve actuator back to the joystick, allowing the operator to feel resistance and position information while maintaining automated electrical control of the implement
Solution Approach 2:
The system implements a feedback mechanism where the position of the joystick is sensed by a position sensor and this information is fed back to control the valve actuation. This closed-loop feedback enables precise control of implement movements while maintaining automated valve control, resolving the contradiction between automation and operator tactile feedback
2Measurement precision
If mechanical feedback linkages are added to provide tactile feedback, then operator control precision is improved, but device complexity increases
Solution Approach 1:
The joystick assembly is designed to perform multiple functions: it serves as both the operator input device and the mechanical feedback transmission path. The same joystick structure that provides directional input also transmits tactile feedback forces from the valve actuator, eliminating the need for separate feedback mechanisms and reducing overall system complexity
Solution Approach 2:
The feedback linkage is integrated into the existing joystick assembly structure rather than being added as a separate component. The position sensor, biasing member, and feedback linkage are combined within the joystick housing, creating a compact multi-functional unit that provides both input control and tactile feedback without significantly increasing device complexity
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 solution provides operators with necessary tactile feedback, allowing for easier control of fine movements by distinguishing between resistance levels, thus enhancing the precision and ease of operating machinery with implement actuation.
Implementation Method 1
The first biasing member is operatively associated with the base and operable to contact the operator input device at a first position and resist movement of the operator input device in the first direction. The second biasing member is operatively associated with the base and operable to contact the operator input device at a second position
Data Source
AI summary
An operator interface assembly for a machine is disclosed. The operator interface assembly comprises a base, an operator input device operable to move in a first direction in relation to the base to a second position and a third position, a first biasing member including a first spring end, and operatively associated with the base and wherein the first spring end is operable to contact the operator input device at a first position and resist movement of the operator input device in the first direction, a second biasing member including a second spring end, and operatively associated with the base and wherein the second spring end is operable to contact the operator input device at the second position, the second position different than the first position, and resist movement of the operator input device in the first direction, and a position sensor.