Vehicle Door Sensor Layout for Gesture Detection and NFC Access
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Solution Overview
Problem
Existing sensor devices for actuating vehicle movable parts, such as sliding doors, suffer from interference issues due to environmental factors and require complex structures, making them unreliable and difficult to mount, while also lacking intuitive operation and enhanced security features.
Innovation Solution
A sensor device incorporating a capacitive sensor unit with multiple sensor elements for gesture detection, an NFC antenna for communication with a vehicle security system, and a printed circuit board design that minimizes interference, allowing for secure and intuitive operation through gesture recognition and NFC authentication, eliminating the need for separate ID transponders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive sensor units and LF/HF antenna are arranged on a printed circuit board, then the sensor device can detect user intention and unlock movable parts, but interference effects occur due to environmental factors and antenna coils
Solution Approach 1:
The sensor device is divided into spatially separated functional units: capacitive sensor elements for gesture detection are positioned away from the LF/HF antenna coils. This segmentation physically isolates the sensing elements from electromagnetic interference sources, allowing reliable capacitive measurement while maintaining wireless communication functionality.
Solution Approach 2:
A shielding structure or ground plane is introduced as an intermediary between the capacitive sensor elements and the LF/HF antenna coils. This intermediary component acts as a barrier that blocks or redirects electromagnetic fields, preventing interference from the antenna from affecting the sensitive capacitive sensing operation.
2Reliability
If separate ID transponders are used for unlocking, then authentication can be performed, but the device structure becomes more complex
Solution Approach 1:
The authentication functionality is merged into the existing NFC antenna system. The same antenna that provides wireless communication also serves as the transponder for authentication, eliminating the need for separate ID transponder hardware. This integration maintains security while simplifying the overall device structure.
Solution Approach 2:
The NFC antenna is designed to perform multiple functions: it serves as both a communication antenna for data transmission and as an authentication transponder. This multi-functional design allows the single component to replace what would traditionally require separate dedicated components, reducing complexity while maintaining reliable authentication.
3Measurement precision
If multiple sensor elements are used for gesture detection, then detection precision is improved, but the device complexity increases
Solution Approach 1:
Multiple capacitive sensor elements are arranged in a spatial pattern (e.g., array or matrix) across different positions and orientations. By distributing sensors across multiple dimensions of space rather than concentrating them in one location, the system achieves enhanced gesture detection precision through spatial differentiation while keeping individual sensor elements simple and manageable.
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 provides a reliable, secure, and easy-to-mount sensor system that ensures authorized user access by combining capacitive and NFC technologies, enhancing safety and convenience with features like emergency stop functions and reduced interference.
Implementation Method 1
capacitive sensor unit with several sensor elements for a motion detection, in particular a gesture detection
Implementation Method 2
NFC antenna (also called NFC sensor/Near Field Communication antenna) for communicating with a vehicle-side security system
Data Source
AI summary
The invention relates to a sensor device (100) for actuating a movable part (101), in particular a sliding door, of a vehicle (1), comprising: a capacitive sensor unit (10) with a plurality of sensor elements (11) for motion detection, in particular gesture detection, of a user to trigger opening and/or closing of the movable part (101), an NFC antenna (30) for communicating with a vehicle-side security system (2) and/or a user-side mobile handheld device (4) in order to trigger unlocking and/or locking of the movable part (101), and a circuit board (20) for accommodating the capacitive sensor unit (10) and the NFC antenna (30).