Inductive Vehicle Door Handle Detection for False Positive Reduction
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Solution Overview
Problem
Existing vehicle door handle presence detection systems using capacitive sensors are prone to false positives due to environmental conditions like humidity and metallic coatings, which can lead to incorrect unlocking or locking, potentially trapping users or causing safety issues.
Innovation Solution
A door handle detection device utilizing an inductive sensor with a non-magnetic metal target and coil forming an oscillating circuit, along with a compressible prestressed element and elastically deformable parts, to reliably detect user intention without false positives, maintaining aesthetic appeal and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive sensors are used for presence detection, then the device can detect user approach and contact, but false positives occur due to environmental conditions like humidity and metallic coatings
Solution Approach 1:
The patent replaces capacitive sensors with an inductive detection system using a coil and non-magnetic metal target. This mechanical/physical substitution eliminates the false positive issues associated with capacitive sensing in humid or metallic environments, as inductive coupling is not affected by these environmental factors.
Solution Approach 2:
The patent changes the detection parameter from capacitive coupling to inductive coupling. By using a coil and metal target that create an inductive field, the system achieves more reliable detection that is insensitive to humidity and metallic coatings, thereby reducing false positives while maintaining detection accuracy.
2Reliability
If the detection device uses a coil and metal target with elastically deformable parts, then reliable detection without false positives is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the detection mechanism with the door handle structure itself. The elastically deformable part is integrated into the handle, and the metal target is positioned within the existing handle assembly, combining structural and sensing functions to reduce overall device complexity despite the advanced detection mechanism.
Solution Approach 2:
The elastically deformable part automatically returns to its initial position after deformation due to its elastic properties, eliminating the need for additional reset mechanisms or complex control systems. The system self-regulates through the physical properties of the elastic material.
3Ease of operation
If the door handle includes an elastically deformable part with contact area, then user-friendly interaction is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the material parameter of the door handle by incorporating an elastically deformable part with specific elastic properties. This material selection allows for more tolerant manufacturing specifications while maintaining the desired user interaction characteristics, as the elastic behavior compensates for minor dimensional variations.
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 robust and reliable detection of user intention to lock or unlock, eliminating false positives and ensuring user safety and comfort by using an inductive sensor that is not affected by environmental disturbances, while maintaining a discreet and user-friendly design.
Implementation Method 1
a coil (20), connected to a capacitance (C1), forming with said capacitance (C1) an oscillating circuit (L, C)
Implementation Method 2
means (M2) for measuring an inductance of said coil (20)
Data Source
AI summary
A device to be integrated into a handle of a vehicle door for detecting a user's intention to lock or unlock the door, with a casing therein that includes a contact detection element that detects a contact of a user's hand on the handle, where an area of contact of the handle is defined by an elastically deformable part, and the contact detection element includes a non-magnetic metal target that moves along a predetermined axis, a coil, a pre-stressed compressible element between the non-magnetic metal target and the coil, means for transmitting a movement of the elastic part to the non-magnetic metal target, and means for comparing a measured inductance of the coil and a predetermined threshold value of inductance for detecting the user's intention to lock or unlock the door.