UWB Gesture Recognition for Reliable Hands-Free Vehicle Access
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Solution Overview
Problem
Conventional hands-free vehicle access systems, such as those using capacitive, ultrasonic, or short-range radar sensing, are sensitive to foot size, shoe material, and environmental conditions, and can lead to user safety issues due to the need for foot gestures, which may result in accidental tailgate opening.
Innovation Solution
A gesture recognition system utilizing ultra-wideband (UWB) transceivers arranged around the vehicle to detect and authenticate a mobile device held by an authorized user, defining zones and monitoring movement routines to grant access through actuators when predefined gestures are matched, allowing for customizable and safer hands-free vehicle access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive, ultrasonic, or short-range radar sensing systems are used for hands-free vehicle access, then the system can detect user presence, but the sensitivity is negatively impacted by foot size, shoe material, and environmental conditions
Solution Approach 1:
The patent replaces mechanical sensing systems (capacitive, ultrasonic, radar) with an optical/image processing system. The camera captures images of the user's foot gesture, and image processing algorithms analyze the gesture patterns to grant access. This substitution eliminates sensitivity to environmental conditions like rain, snow, and shoe material, as optical imaging is not affected by these factors.
2Ease of operation
If foot gestures are required for hands-free access, then the system enables contactless operation, but user safety is compromised due to potential accidental tailgate opening
Solution Approach 1:
The patent segments the gesture recognition process into multiple distinct phases: detection phase (capturing the gesture), analysis phase (processing the gesture pattern), and execution phase (granting access). By requiring a complete sequence of validated gestures rather than a single simple motion, the system maintains ease of contactless operation while significantly reducing accidental activation through multi-step verification.
Solution Approach 2:
The system incorporates feedback mechanisms where the camera continuously monitors and validates gesture sequences before triggering access. The image processing system provides real-time feedback on gesture recognition status, ensuring that only properly executed, intentional gestures result in tailgate opening, thereby preventing accidental activation while maintaining contactless operation.
3Device complexity
If conventional sensing systems are used, then the system structure is relatively simple, but the system reliability is reduced due to sensitivity to various external factors
Solution Approach 1:
The patent replaces complex mechanical sensing systems with an optical imaging system combined with digital image processing. While the hardware structure (camera) is simpler than multi-sensor arrays, the digital processing algorithms provide robust reliability by analyzing gesture patterns, filtering noise, and making intelligent decisions about access authorization, thereby achieving high reliability without complex mechanical structures.
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 UWB-based system provides precise location accuracy and customizable access routines, enhancing user safety and reliability by eliminating the need for foot gestures, thus improving the sensitivity and safety of hands-free vehicle access.
Implementation Method 1
a gesture recognition system utilizing ultra-wideband (UWB) transceivers arranged around the vehicle to detect and authenticate a mobile device
Data Source
AI summary
A gesture recognition system for hands-free access to a vehicle includes a set of vehicle ultra-wideband (UWB) transceivers comprising at least three UWB transceivers and a controller configured to detect a presence of a vehicle-authorized mobile device in possession of an authorized user, determine a set of defined zones proximate to the vehicle and associated with hands-free vehicle access, communicate between the set of vehicle UWB transceivers and a device UWB transceiver of the mobile device to monitor a location of the mobile device, monitor a movement routine of the mobile device relative to the set of defined zones over a period, and in response to determining a match with one of a set of predefined movement routines associated with hands-free vehicle access, command one of a set of access actuators of the vehicle to grant hands-free vehicle access corresponding to the matched predefined movement routine.