Vehicle UHF Attenuation Layout for Precise Hands-Free Key Location
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 'hands-free' access systems for motor vehicles using Bluetooth or Bluetooth Low Energy communication struggle to precisely locate portable devices at short distances due to imprecise RSSI measurements, making it difficult to unlock or start the vehicle, and also face challenges with long-range communication being compromised for precise location, which is necessary for remote control functions.
Innovation Solution
The system incorporates a locating device with multiple attenuation modules and impedance settings to control the range of Ultra High Frequency waves, allowing for precise location of portable devices in and around the vehicle while maintaining long-range communication capabilities, enabling remote control functions like locking/unlocking and starting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If Bluetooth or Bluetooth Low Energy communication is used for hands-free access, then long-range communication capability is improved, but measurement precision for locating portable devices deteriorates
Solution Approach 1:
The patent divides the communication and location system into two distinct functional segments: a first communication unit for long-range Bluetooth communication and a second communication unit for short-range precise location using RSSI measurements. This segmentation allows each unit to be optimized for its specific function without compromise
Solution Approach 2:
The patent introduces an intermediary mechanism by using the first communication unit to establish initial contact and then transitioning to the second communication unit for precise location. The system acts as an intermediary between long-range and short-range communication requirements
2Measurement precision
If attenuation modules are added to control UHF wave range for precise location, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the attenuation control function into a separate, dedicated module that can be independently optimized. The attenuation module is taken out as a distinct component with specific impedance settings, separating the precision location function from the main communication system
Solution Approach 2:
The patent applies local quality by creating specific impedance settings (first, second, and third impedance values) that are optimized for different location precision requirements. Each attenuation module is configured with specific electrical characteristics tailored to its function
3Adaptability or versatility
If multiple attenuation modules with different impedance settings are used, then adaptability for different location scenarios is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by making the attenuation module switchable between different impedance settings based on operational requirements. The system can dynamically adjust between first, second, and third impedance values depending on the communication scenario and desired location precision
Solution Approach 2:
The attenuation module serves multiple functions: it enables precise location measurement, maintains long-range communication capability, and adapts to different operational scenarios. A single multi-functional module replaces what would otherwise require separate dedicated systems
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
This solution allows for precise location of portable devices via Bluetooth or Bluetooth Low Energy, enabling 'hands-free' starting and maintaining long-range communication, thus overcoming the limitations of previous systems by defining multiple locating areas and ensuring continuous location tracking.
Implementation Method 1
a transceiver (10) electrically connected to at least one antenna (A) by an electric communication line (20A)
Implementation Method 2
at least one attenuation module (M1) located on the electric communication line (20) between the transceiver (10) and the antenna (A)
Data Source
AI summary
A method and a system for ultra high frequency communication with and location of a portable device for “hands-free” access to a motor vehicle, the motor vehicle having an on-board communication device comprising an ultra high frequency transceiver, an electrical power supply source and at least one antenna, the motor vehicle including a first arrangement, in which the transceiver is connected to the antenna, and a second arrangement, in which the transceiver is disconnected from the antenna. The transceiver is connected to an attenuation module located at a predetermined distance from the transceiver. The attenuation module includes an impedance of predetermined value connected to ground. The predetermined distance between the transceiver and the attenuation module, as well as the predetermined value of the impedance, defining a locating area of the portable device in and around the motor vehicle.