Multilayer Capacitive Sensor Electrode Switching for Vehicle Door Detection
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Solution Overview
Problem
Modern vehicles require complex and flexible operating options for capacitive proximity detection, which existing sensor arrangements struggle to provide due to rigid functionality and limited adaptability in detecting different user interactions.
Innovation Solution
A multilayer circuit board with multiple metallization levels, where electrode areas can temporarily function as sensor, ground, or shield electrodes, allowing for time-division multiplexed control and synchronization with an evaluation device to adapt detection schemes based on user interactions and vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensor devices are used to detect different user interactions, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling electrode areas to perform multiple roles (sensor electrode, ground electrode, shield electrode) through time-division multiplexing. The control device dynamically assigns different functions to the same physical electrodes at different times, allowing a single sensor device to detect multiple types of user interactions (approach, grip, release) that would traditionally require separate devices.
Solution Approach 2:
The patent implements dynamics through time-division multiplexing where the functional configuration of electrodes changes dynamically over time. The control device switches between different operational modes (first detection scheme with sensor electrode facing first direction, second detection scheme with sensor electrode facing second direction) based on detection needs, making the system adaptable rather than static.
2Device complexity
If electrode areas are assigned fixed functions, then device simplicity is maintained, but adaptability to different detection schemes is limited
Solution Approach 1:
The patent applies periodic action through time-division multiplexing where electrode areas are periodically switched between different functional assignments. The control device cycles through different detection schemes, assigning sensor, ground, and shield electrode roles to different physical electrodes in alternating time periods, enabling the system to maintain simplicity while achieving adaptability through rhythmic reconfiguration.
3Device complexity
If a single sensor electrode detects approaches from all directions, then device simplicity is maintained, but measurement precision for directional detection is reduced
Solution Approach 1:
The patent applies segmentation by dividing the detection task into directional segments. Instead of using one omnidirectional sensor, the system segments detection into different spatial directions (first direction and second direction) and activates appropriate electrode areas based on the direction from which approach is detected, thereby maintaining simplicity while improving directional measurement precision.
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 flexible and efficient detection of user interactions, such as opening and closing a vehicle door, by dynamically reconfiguring electrode functions without the need for multiple sensor devices, enhancing sensing capabilities and adaptability.
Implementation Method 1
A control device is coupled to the sensor electrode in order to apply an electrical voltage to the sensor electrode with respect to a reference potential
Implementation Method 2
An evaluation device detects changes in capacitance on the sensor electrode in order to detect the approach of a user to the sensor electrode
Implementation Method 3
Capacitive proximity sensing systems are known in the art. A capacitance develops between the sensor electrode, which is brought to a predetermined potential, and a reference electrode
Data Source
Figure 1~3
AI summary
The invention relates to a sensor device for a motor vehicle, comprising a multi-layer circuit board (2), on which a plurality of metallization levels are formed. A capacitive sensor electrode is formed on one of the metallization levels for detection by means of capacitive proximity sensing. A control device (3) controls the sensor electrode as a capacitive sensor electrode in order to detect approaches of a user toward the sensor electrode by means of an evaluating device. At least one planar electrode region (11, 12, 13, 14, 15, 16, 17, 18, 19) is formed on each of a plurality of the metallization levels, wherein each of the electrode regions is coupled to the control device (3). At least two of the electrode regions on different metallization levels are controlled and evaluated as sensor electrodes in alternation in time, and at least two of the electrode regions on different metallization levels are controlled and evaluated as a ground in alternation in time.