Vehicle Touch Control Panel With Redundant Capacitive Sensing
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Solution Overview
Problem
Operator control devices with capacitive sensor systems face challenges in accurately identifying user inputs on touchscreens, particularly in safety-relevant systems, due to potential false triggers from unintentional contacts, which can lead to misidentification and safety issues.
Innovation Solution
The use of comb-like or meanderous capacitive sensor structures arranged in intermeshing fashion beneath the user interface, combined with a method that involves charging and shorting reference and measurement capacitances to register changes in capacitive coupling, and the inclusion of a pressure-sensitive sensor for redundant identification, enhances the accuracy and reliability of user input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive sensor device is used to identify user inputs on a touchscreen, then the user interface becomes more versatile and modern, but false triggers from unintentional contacts occur leading to reduced reliability
Solution Approach 1:
The sensor system is divided into multiple independent capacitive sensor devices (first sensor device and second sensor device), each with its own sensor structure. This segmentation allows redundant detection where multiple sensors must agree on a user input, preventing false triggers from single unintentional contacts while maintaining touchscreen versatility
Solution Approach 2:
The system implements cross-validation feedback between multiple sensor devices. Each sensor's detection result is compared against the others before triggering a safety-relevant function. This feedback mechanism filters out false positives from unintentional contacts while preserving legitimate user inputs that consistently register across multiple sensors
2Reliability
If redundant sensor devices are added to prevent false triggers, then reliability improves, but device complexity increases
Solution Approach 1:
Multiple capacitive sensor devices are merged into a single integrated sensor system with unified evaluation logic. The first and second sensor devices share common control circuitry and processing, reducing overall system complexity compared to completely separate redundant systems while maintaining the reliability benefits of multiple sensing elements
Solution Approach 2:
The multiple sensor structures serve dual purposes: they individually detect user inputs for normal operation and collectively provide redundant verification for safety-critical functions. This multi-functionality allows the same hardware components to address both user interface versatility and safety reliability without requiring separate dedicated systems
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 configuration allows for precise and redundant identification of user inputs, reducing the likelihood of false triggers and improving the safety and reliability of safety-relevant function control by enhancing the accuracy and sensitivity of capacitive coupling registration.
Implementation Method 1
capacitive sensor devices having a first, electrically conductive sensor structure and a second, capacitive sensor device having a second, electrically conductive sensor structure, the sensor structures being arranged beneath a user interface in the area of the user input panel
Data Source
AI summary
An operator control device for a vehicle, and a method for operating such an operator control device is disclosed. The operator control device is for controlling safety-relevant functions. To this end, the operator control device has at least one user interface having at least one user input panel for user input and a sensor system for identifying a user input in the area of the user input panel, wherein the sensor system has at least one capacitive sensor device having a first, electrically conductive sensor structure and a second, capacitive sensor device having a second, electrically conductive sensor structure, the sensor structures being arranged beneath the user interface in the area of the user input panel. The first sensor structure and the second sensor structure are each configured in comb-like and/or meanderous fashion and arranged in intermeshing fashion at least in a subarea of the user input panel.