Hydraulic Joystick Haptic Feedback Without Sensor Interference
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Solution Overview
Problem
Existing hydraulic joystick control systems are complex and not suitable for compact applications, as they require additional haptic devices that complicate the structure and are typically used only in high-end or complex drive machines, making them unsuitable for versatile and adaptable solutions.
Innovation Solution
A control apparatus comprising an actuation section with an oscillating control element and control rods, a sensor section with magnetic sensors, and an auxiliary haptic section using ferromagnetic elements and a coaxial winding to generate a magnetic field, providing feedback through a resisting force that can be modulated based on operating conditions, without interfering with the sensor section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a haptic device is added to provide tactile feedback, then user feedback capability is improved, but device complexity increases
Solution Approach 1:
The haptic feedback device is merged with the existing joystick structure by integrating ferromagnetic elements into the control rods and using the existing magnetic sensors for detection. The coaxial winding is integrated into the rod structure, allowing haptic feedback without adding separate complex haptic mechanisms.
Solution Approach 2:
The magnetic components serve dual functions: the ferromagnetic elements in the control rods are used both for haptic feedback generation and for position detection by the magnetic sensors. This multi-functionality reduces overall system complexity while maintaining haptic capability.
2Ease of operation
If ferromagnetic elements are placed near sensors for haptic feedback, then haptic feedback is generated, but sensor detection accuracy deteriorates
Solution Approach 1:
The ferromagnetic elements are positioned coaxially along the length of the control rods, utilizing the longitudinal dimension. This spatial arrangement ensures that the magnetic field generated for haptic feedback does not interfere with the radial magnetic field detection performed by the sensors, maintaining detection accuracy while enabling haptic feedback.
Solution Approach 2:
The ferromagnetic elements are positioned at specific locations along the control rods (coaxially arranged) rather than uniformly distributed, creating localized magnetic fields for haptic feedback while leaving other regions unaffected for accurate sensor detection. This localized approach maintains measurement precision in critical areas.
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 allows for a compact, versatile control apparatus that provides haptic feedback without compromising the detection of the lever's position, enabling adaptable and modular designs suitable for various applications, with the haptic device's presence not impacting the overall structure's efficiency or complexity.
Implementation Method 1
a winding is provided coaxial to the ferromagnetic elements to generate such a magnetic field
Implementation Method 2
generate a magnetic field concatenated to the pair of magnetic elements so as to generate an attractive force between the two
Implementation Method 3
a sensor section comprising a plurality of sensor elements preferably of a magnetic type to detect a movement in the longitudinal direction of said control rods
Data Source
AI summary
A control apparatus for actuating hydraulic valve systems includes an actuation section including an oscillating control element and a plurality of control rods provided with a pusher capable of interacting with the control element so as to translate the control rods in a longitudinal direction, a sensor section including a plurality of sensor elements for detecting a movement in a longitudinal direction of said control rods, and an auxiliary section capable of generating a force opposing the motion of the control rods.