Segmented Capacitive Door Sensor Electrode for Vehicle Contours
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Solution Overview
Problem
Capacitive sensor electrodes used in vehicles face challenges in adapting to various geometries while maintaining high sensitivity and being space-efficient, leading to potential errors in detection and inflexibility in mounting.
Innovation Solution
A capacitive sensor arrangement featuring an elongated flat electrode with alternating wider and narrower sections, made from electrically conductive materials, allowing for flexible adaptation to vehicle contours and improved sensitivity through differential capacitive sensitivity along its length, coupled with a deformable insulative covering for protection and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a uniform flat electrode is used, then the sensor arrangement is simple in structure, but it cannot adapt to various vehicle geometries and maintains high sensitivity throughout
Solution Approach 1:
The flat electrode is divided into multiple sections with different width characteristics. The electrode comprises a first section with a first width and a second section with a second width, creating segmented zones with different capacitive sensitivities. This segmentation allows the electrode to adapt to various vehicle geometries while maintaining a relatively simple overall structure.
Solution Approach 2:
Different sections of the electrode are designed with different local properties - specifically different widths that create different capacitive sensitivities. The first section has different dimensions than the second section, allowing each local area to be optimized for its specific detection requirements while maintaining structural simplicity.
2Measurement precision
If the sensor electrode is placed at the smallest possible distance from the detection area to maximize sensitivity, then detection sensitivity is improved, but the mounting becomes less flexible and more space-consuming
Solution Approach 1:
The electrode is segmented into sections with different widths, allowing different portions to be positioned at different distances from the detection area. This enables the sensor to maintain high sensitivity in critical areas while providing mounting flexibility in other areas, resolving the contradiction between sensitivity and adaptability.
Solution Approach 2:
Different sections of the electrode have different local properties (widths) that correspond to different detection requirements. This allows the electrode to achieve high measurement precision in specific local areas while maintaining overall mounting flexibility through the varied structure.
3Area of stationary object
If a continuous wide electrode surface is used, then the sensor covers a large detection area, but it reduces flexibility for adaptation to different vehicle shapes and increases space requirements
Solution Approach 1:
The electrode surface is segmented into multiple sections with different widths along its longitudinal extent. This segmentation maintains a large overall detection area while creating variations in local width that provide flexibility for adapting to different vehicle shapes and mounting locations.
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 enhances the flexibility and sensitivity of the sensor electrodes, enabling reliable detection of movement gestures and improved alignment with the detection area, reducing errors and allowing for easy adaptation to different vehicle shapes while maintaining high sensitivity.
Implementation Method 1
A capacitive sensor arrangement with a sensor electrode, with the aid of which the penetration of an object into a space in front of the sensor electrode is detected. A control and evaluation circuit coupled to the sensor electrode detects a change in the capacitance of the sensor electrode compared to a reference potential by periodically charging and discharging the sensor electrode at a specified frequency
Implementation Method 2
The sensor electrode reacts to objects approaching or touching by changing the capacitance of the capacitor formed from the sensor electrode and the object. Essentially, this can be traced back to the fact that the capacitance of a capacitor depends on the distance between its plates.
Data Source
Figure 1~2
Figure 3a~3c
Figure 4a~4b
AI summary
The invention relates to a sensor arrangement for the capacitive sensing of approximations close to a motor vehicle (1), comprising a capacitive sensor electrode (2, 3; 25) and at least one control and evaluation device (4) which is coupled to the sensor electrode and which senses a change in the capacitance of the sensor electrode. Said sensor electrode (2, 3; 25) is an elongate flat electrode, wherein in the longitudinal direction of the sensitive electrode, first electrode sections (a) having a first surface width and a first deformability alternate with second sections (b) having a second, narrower surface width and a second deformability such that electrode surfaces, which have different levels of deformability, have different measurements and which are continuously conductive and joined, are formed. A deformable and electrically insulating sheathing (30; 40) surrounds the sensor electrode.