Joystick Haptic Braking With Magnetorheological Damping
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Solution Overview
Problem
Conventional joysticks face challenges in providing high torque with compact and cost-effective designs, especially in applications where structural space is limited, and they often suffer from oscillation issues that affect operator control quality and accuracy.
Innovation Solution
The input apparatus incorporates a magnetorheological brake device coupled with a control device to provide targeted damping and haptic feedback, allowing for adaptable and precise control of the operator control lever, preventing oscillation and enhancing operator control quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If electric motors or hydraulic/pneumatic cylinders are used to generate high torque (100 N actuating force), then the operator control quality and haptic feedback are improved, but the device becomes expensive, large, complex, and requires significant structural space
Solution Approach 1:
The patent replaces complex electric motors or hydraulic/pneumatic cylinders with a magnetorheological brake device that uses magnetic field control of a magnetorheological medium to generate the required braking torque. This substitution dramatically simplifies the actuator system while maintaining the capability to generate high forces (100 N actuating force) for realistic haptic feedback in professional joysticks and simulators
Solution Approach 2:
The patent changes the physical state and properties of the magnetorheological medium through magnetic field application. By varying the magnetic field strength, the viscosity and yield stress of the magnetorheological medium are dynamically adjusted, enabling continuous variation of the braking torque from zero to maximum values, thus providing continuously variable controllability of the haptic feedback force
2Force
If electric motors or hydraulic/pneumatic cylinders are used to generate high torque, then the operator control quality is improved, but the structural space required increases significantly
Solution Approach 1:
The patent replaces bulky electric motors or hydraulic/pneumatic cylinders with a compact magnetorheological brake device. The magnetorheological brake generates high braking torque through magnetic field control of the magnetorheological medium, achieving the same force output (100 N actuating force) in a significantly reduced volume, making it suitable for applications with constricted structural space
3Device complexity
If mechanical slotted guides, springs, or detent systems are used for implementing different functions, then the device construction is simplified, but the operator control quality deteriorates due to oscillation issues
Solution Approach 1:
The patent replaces mechanical slotted guides, springs, and detent systems with a magnetorheological brake device controlled by electronic control means. This substitution eliminates the oscillation issues inherent in mechanical systems while maintaining construction simplicity, thereby improving operator control quality and reliability without adding significant complexity
Solution Approach 2:
The patent incorporates sensor means for detecting the pivot angle of the operator control lever and feeds this information to the control means. The control means uses this feedback to dynamically adjust the braking torque of the magnetorheological brake, preventing oscillation and ensuring stable, precise operator control while maintaining a simple construction
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
This solution enables improved operator control quality and reduced structural space requirements, providing flexible and cost-effective haptic feedback that enhances user experience across various applications, including gaming and industrial uses.
Implementation Method 1
The brake device is configured as a magnetorheological brake device and has at least one magnetic-field-generating device for generating the magnetic field in the channel
Implementation Method 2
The channel contains a magnetorheological medium which can be influenced by a magnetic field
Data Source
AI summary
An input apparatus, in particular a joystick, has an operating device, a magnetorheological braking device, and a control device for actuating the braking device. The operating device has a support and an operating lever that is pivotable about at least one pivot axis. A sensor senses a pivot angle of the operating lever. The braking device is coupled to the pivot axis in order to damp, in a controlled manner by way of the control device, a pivot movement of the operating lever. The control device actuates the braking device depending on a control command and converts the control command into a haptic signal, preferably a defined sequence of deceleration torques, which can be perceived on the operating lever. A user, as a result of an input made, can receive haptic feedback (so-called force feedback).