Magnetorheological Haptic Interface Wake-Up Control
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Solution Overview
Problem
Magneto-rheological fluid-based control interfaces in motor vehicles face issues with reproducibility of braking forces due to particle distribution inhomogeneities and temperature variations, leading to inconsistent haptic feedback.
Innovation Solution
Incorporating a wake-up unit that applies a magnetic field to reposition particles and adjust the temperature of the magneto-rheological fluid when a reset parameter is detected, ensuring consistent haptic feedback by reconnecting the coil to the magnetic field application unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetorheological fluid is used to generate braking forces, then haptic feedback is achieved with minimal driver attention, but particle distribution inhomogeneity causes inconsistent braking forces
Solution Approach 1:
The patent applies a magnetic field to the magnetorheological fluid before the fluid is actually needed for haptic feedback. This preliminary action redistributes the particles uniformly throughout the fluid, preventing sedimentation and ensuring consistent braking forces when the fluid is activated during normal operation.
2Force
If magnetorheological fluid is used for haptic feedback, then resistance forces are generated, but temperature variations affect fluid viscosity and braking force reproducibility
Solution Approach 1:
The patent applies a magnetic field to the magnetorheological fluid before the fluid is actually needed for haptic feedback. This preliminary action redistributes the particles uniformly throughout the fluid, preventing sedimentation and ensuring consistent braking forces when the fluid is activated during normal operation.
3Loss of energy
If the control interface remains inactive for long periods, then energy is conserved, but particle sedimentation occurs causing inconsistent haptic feedback upon activation
Solution Approach 1:
The patent applies periodic magnetic fields to the magnetorheological fluid during idle periods when the control interface is not in use. This periodic action prevents particle sedimentation and maintains fluid homogeneity without requiring continuous energy input, ensuring consistent haptic feedback when the interface is activated.
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 maintains consistent haptic feedback by repositioning particles and adjusting the fluid's temperature, reducing the impact of sedimentation and temperature-related inhomogeneities, thus ensuring reliable braking forces and user experience.
Implementation Method 1
the viscosity of the magnetorheological fluid changes with the intensity of the applied magnetic field. More precisely, magnetorheological fluids are composed of suspended metallic particles. When a magnetic field is applied, the particles align themselves along the field lines.
Implementation Method 2
When a magnetic field is applied, the particles align themselves along the field lines. The alignment of the particles with the field lines in the area subjected to the field modifies the viscosity of the fluid.
Implementation Method 3
applying a reactivation magnetic field to the magnetorheological fluid raises the internal temperature of the fluid module, restoring the fluid to its normal operating temperature
Data Source
Figure 1~2
AI summary
The invention relates to a haptic-feedback control interface for a motor vehicle, comprising a magnetorheological fluid module (3; 31) including a movable element (6; 61), a magnetorheological fluid (7) in contact with the movable element (6; 61), a unit (4) for applying a magnetic field, and at least one coil (8; 81) for applying a magnetic field to the magnetorheological fluid (7), the unit (4) for applying a magnetic field being configured so as to adjust the supply of power to the coil (8; 81) in order to generate haptic feedback for the user moving the movable element (6), characterised in that the interface comprises an alarm unit (18) configured to detect the activation of a reset parameter, the alarm unit (18) being connected to the unit (4) for applying a magnetic field in order to apply an alarm magnetic field to the magnetorheological fluid (7) when the activation of a reset parameter is detected. The invention also relates to a method for controlling a haptic-feedback control interface.