Capacitive Vehicle Switch Pre-Selection Feedback

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Solution Overview

Problem

Motor vehicle operators lack pre-selection feedback for control buttons, which can lead to distraction during vehicle guidance, as existing solutions provide visual or acoustic feedback only after selection, not before.

Innovation Solution

A capacitive button design with an internal electrode and a sheet metal part as one electrode, utilizing the vehicle body as the second electrode, allowing for pre-selection capacitance change detection and providing visual or acoustic feedback without pressing the button, ensuring structural simplicity, ease of automation, and economic production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If visual or acoustic feedback is provided only after button selection, then device complexity is reduced, but operator distraction increases and operational safety deteriorates

Engineering Contradiction:

Improveoperational safetyVSAvoidfeedback system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements preliminary feedback by detecting capacitance changes when the operator approaches the button, providing visual or acoustic information about the button function before actual selection. This preliminary action allows the operator to be informed of the selected function in advance, preventing distraction during vehicle guidance while maintaining relatively simple device architecture through the use of existing capacitive sensing capabilities.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If a capacitive sensor plate is integrated into the control element, then pre-selection feedback is enabled, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvepre-selection feedbackVSAvoidcontrol element structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent achieves multi-functionality by using the existing button structure to serve both as a mechanical actuator and as part of the capacitive sensing system. The button itself or its housing forms one electrode of the capacitor, while the sensor plate forms the other electrode. This universal use of existing components enables pre-selection feedback without adding separate complex sensing mechanisms, thereby maintaining ease of operation while limiting increases in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the button structure with the capacitive sensing system by integrating the sensor plate into the control element housing or button assembly. The button and sensor plate together form the capacitive sensor, combining mechanical input and electrical sensing functions into a unified structure. This merging approach enables pre-selection feedback capability while avoiding the need for separate, additional components that would increase device complexity and manufacturing cost.

Inventive Principle:

Principle #5Merging (Combining)

3Shape

If metallic surfaces are present in the control element, then aesthetic appearance is improved, but electrostatic discharge risk increases

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidelectrostatic discharge risk

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially harmful electrostatic discharge into a useful sensing mechanism. The capacitance changes caused by the operator's approach (which would be related to electrostatic effects) are detected and used to trigger pre-selection feedback. Additionally, the patent provides discharge paths for electrostatic charges, converting the harmful accumulation of static electricity into a controlled discharge mechanism that protects electronic components while maintaining aesthetic metallic surfaces.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces intermediate protective measures between the metallic surfaces and electronic components. Discharge paths are provided that route electrostatic charges through controlled pathways (such as resistive connections or designated ground paths) rather than allowing direct discharge into sensitive electronics. This intermediary approach maintains the aesthetic appearance of metallic surfaces while protecting against electrostatic discharge damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables operators to receive pre-selection feedback visually or acoustically, enhancing operational ease and safety by indicating the button function before actuation, while also protecting electronic components from electrostatic discharges through grounding metallic surfaces.

Implementation Method 1

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentEP2024982B1Operational control for a vehicle

Publication Date: 2012.10.03 PREH GMBH

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AI summary

The invention relates to an operational control (1) for a vehicle having a housing and at least one movable switch (3) accommodated in the housing, in particular a contact switch (3), the interior of the switch (3) at least in some regions being of hollow construction, and in the interior of the switch (3) an electrode (5) of a capacitor being arranged, so that when an operator approaches the switch (3) a change in capacitance is detectable by means of an electronic unit connected in series.