Vehicle Presence Scanning With Split UWB Transceivers for U-Turn Access
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Solution Overview
Problem
Existing vehicle scanning systems face challenges in simultaneously detecting presence inside the vehicle and locating the user around the vehicle after locking, particularly when the user performs a U-turn, due to the 'wall effect' caused by Ultra-Wide Band (UWB) transceivers being dedicated to either function, leading to inconvenience and potential safety issues.
Innovation Solution
A method utilizing both internal and external ultra-wideband transceivers, combined with Ultra High Frequency communication and a gyroscope in portable equipment, to detect the user's U-turn and determine their position, allowing simultaneous scanning for presence inside the vehicle and user location without prioritizing one function over the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UWB transceivers are dedicated to scanning for presence inside the vehicle, then detection reliability is improved, but user location tracking capability deteriorates
Solution Approach 1:
The UWB transceiver system is segmented into internal transceivers (mounted inside the vehicle) and external transceivers (mounted outside the vehicle). Internal transceivers are dedicated to scanning for presence inside the vehicle, while external transceivers are dedicated to tracking the user's location outside the vehicle. This segmentation allows both functions to operate simultaneously without interfering with each other, resolving the contradiction between presence detection reliability and user location tracking capability.
2Device complexity
If UWB transceivers are used for both presence scanning and hands-free access, then device complexity is reduced, but operational reliability deteriorates due to the wall effect
Solution Approach 1:
The transceiver system is divided into internal and external units with distinct functional responsibilities. Internal transceivers handle presence scanning while external transceivers handle user location tracking for hands-free access. This segmentation eliminates the wall effect that occurs when a single transceiver system attempts to perform both functions simultaneously, as each segment operates in its dedicated zone without signal interference from the other.
Solution Approach 2:
The external UWB transceivers act as intermediaries between the user and the vehicle when the user returns after a U-turn. While internal transceivers are occupied with presence scanning, external transceivers continuously track the user's location and can trigger door unlocking when the user approaches, ensuring reliable operation even when internal transceivers are unavailable for access functions.
3Reliability
If UWB transceivers scan for presence for 10 seconds after locking, then safety standard compliance is improved, but user convenience deteriorates due to delayed door access
Solution Approach 1:
The system segments detection functions between internal transceivers (presence scanning for 10 seconds to comply with safety standards) and external transceivers (continuous user location tracking). This allows the vehicle to meet the 10-second presence scanning requirement while simultaneously maintaining user location awareness, so that when the user returns after a U-turn, the door can be unlocked immediately without the 10-second delay that would otherwise occur.
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 reliable and simultaneous detection of presence inside the vehicle and user location outside, preventing the 'wall effect' and ensuring the vehicle door can be unlocked without user inconvenience, while adhering to the 10-second standard.
Implementation Method 1
scanning for presence inside the vehicle using internal ultra-wideband transceiver module (1) capable of transmitting toward the inside of the vehicle (V) and comparing a profile of waves reflected and received by said internal module (1) with at least one predetermined wave profile
Implementation Method 2
at least one external ultra-wideband transceiver module (4) capable of transmitting toward the outside of the vehicle (V) and capable of locating portable 'hands-free' access equipment (2) carried by a user
Implementation Method 3
A method utilizing both internal and external ultra-wideband transceivers, combined with Ultra High Frequency communication and a gyroscope in portable equipment, to detect the user's U-turn
Data Source
AI summary
A method for scanning for presence inside a vehicle, using a scanning device including at least one internal and one external ultra-wideband transceiver module for locating portable “hands-free” access equipment carried by a user. The device has an Ultra High Frequency communicator for communicating with the equipment. The method includes: a) detecting locking of the vehicle; b) for a predetermined duration: i) scanning for presence inside the vehicle with the internal module; ii) simultaneously transmitting a request to the equipment for detecting a U-turn by the user; iii) if a U-turn signal is received, stopping scanning and determining the position of the user with the two modules; iv) if presence is detected inside the vehicle, stopping scanning and transmitting a warning; c) when the duration has elapsed, if no U-turn signal is received and if no presence is detected, the position of the user is determined with the two modules.