Servosystem Rotary Knob with Detents and Brake

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing servosystems for motor vehicles lack effective haptic feedback and precise control when using rotary elements for scrolling through lists of menu items, leading to unclear activation of selected functions.

Innovation Solution

A servosystem incorporating a rotary knob with mechanical detents, a brake, and a high-resolution rotation sensor, which converts rotation into scrolling motion and activates the brake at the first or last menu item, providing enhanced haptic feedback and precise control through a display showing clickable menu items.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a rotary element is used for scrolling through menus, then the operation is simplified, but haptic feedback and activation clarity are insufficient

Engineering Contradiction:

Improvemenu operationVSAvoidactivation clarity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The rotary element's rotation is segmented into discrete steps through mechanical detents, creating distinct haptic feedback points. Each detent corresponds to a specific menu item position, providing clear tactile confirmation of selection and activation status without complicating the overall rotary operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements haptic feedback through the mechanical detents that create resistance and tactile cues during rotation. This feedback mechanism allows users to sense menu item selection and activation states through touch, enhancing clarity without requiring additional visual or auditory signals.

Inventive Principle:

Principle #23Feedback

2Reliability

If mechanical detents are added to the rotary element, then haptic feedback is improved, but the device complexity increases

Engineering Contradiction:

Improvehaptic feedbackVSAvoidrotary element structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mechanical detents are integrated directly into the rotary element structure itself, combining the feedback mechanism with the operating component. This merging approach provides haptic feedback functionality without requiring separate feedback devices, thereby limiting the increase in overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If a high-resolution rotation sensor is used, then measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improverotation measurementVSAvoidsensor system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical measurement mechanisms with an electrical rotation sensor that directly measures angular position. The sensor converts mechanical rotation into electrical signals for digital processing, achieving high precision without the complexity of mechanical gear systems or optical encoders.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Measurement precision

If the brake is activated frequently to stop at menu items, then positioning accuracy is improved, but the duration of action decreases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidrotation continuity

Core Design Contradiction:

Measurement precisionVSDuration of action of moving object

Solution Approach 1:

The brake is activated periodically only when approaching or reaching menu item positions, rather than continuously. This periodic braking provides precise positioning at discrete points while allowing continuous rotation between positions, maintaining both accuracy and operational fluidity.

Inventive Principle:

Principle #19Periodic action

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 enables clear and recognizable haptic feedback and precise control, allowing users to effectively navigate through lists of menu items with improved accuracy and usability.

Implementation Method 1

with a brake to brake the rotary element

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

with a rotation sensor to measure the rotation of the rotary element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS7643017B2Servosystem

Publication Date: 2010.01.05 VOLKSWAGEN AG

AI summary

A servosystem, in particular a servosystem for a motor vehicle, includes a display showing a list of clickable menu items, a rotary knob with a rotary element to operate the rotary knob, with a number of mechanical detents to alternately increase the rotary momentum necessary for rotating the rotary element, with a brake to brake the rotary element and with a rotation sensor to measure the rotation of the rotary element with a resolution that is the least four times, in particular at least six times, and with particular preference at least eight times the number of mechanical detents per rotation of the rotary element, and a control for converting the rotation of the rotary element into a scrolling motion through a list and for activating the brake when the last clickable menu item of the list is reached or the first clickable menu items of the list is reached.