Power-Folding Side-Mirror Antenna for Accurate Key Fob Detection
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Solution Overview
Problem
Existing remote keyless-entry (RKE) and passive-entry passive-start (PEPS) systems face challenges in accurate range detection due to antenna placement, particularly when using newer Bluetooth Low Energy (BLE) and Ultra-Wide Band (UWB) technologies, as these require non-metallic structures to avoid signal obstruction, leading to packaging and installation issues.
Innovation Solution
The system utilizes power-folding side-mirror housings to position communication nodes and antennas, allowing for retracted positions that enhance antenna coverage patterns and reduce signal-blocking, enabling more accurate key fob detection and communication by adjusting the position of side-mirror housings based on the anticipated direction of the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If antennas are positioned at corners of the vehicle behind plastic trim components, then packaging space is optimized and installation is simplified, but installation height is reduced which inhibits accurate range detection
Solution Approach 1:
The patent applies the dynamics principle by making the side-mirror housing movable between retracted and extended positions. The antenna system transitions from a static corner-mounted configuration to a dynamic system where the mirror housing can be positioned optimally for RF signal transmission. The controller determines whether the housing is retracted or extended and adjusts RF signal transmission accordingly, allowing the system to adapt to different operational states and maintain accurate range detection regardless of mirror position.
2Area of stationary object
If antennas are positioned at corners of the vehicle, then packaging space is optimized, but the mounting locations do not directly face the approaching vehicle operator and other sensors compete for available packaging space
Solution Approach 1:
The patent applies the universality principle by integrating multiple functions into the side-mirror housing. The housing serves both as a structural component for the side-view mirror and as a mounting platform for the antenna system. This multi-functional design eliminates the need for separate antenna mounting locations, thereby optimizing packaging space while maintaining effective signal transmission capability through the mirror's extended position.
Solution Approach 2:
The system uses the dynamic positioning capability of the side-mirror housing to overcome the limitation of corner mounting. By extending the mirror housing, the antenna gains an unobstructed line-of-sight to approaching operators, effectively transforming a space-constrained static position into a functionally superior dynamic position for RF communication.
3Measurement precision
If newer Bluetooth Low Energy (BLE) and Ultra-Wide Band (UWB) technologies are used for improved distance-measuring capabilities, then range detection accuracy is improved, but antennas cannot be concealed behind metal structures due to relatively high RF transmission frequencies
Solution Approach 1:
The patent resolves the contradiction between using high-frequency BLE/UWB technologies and avoiding metal obstruction by utilizing the dynamic extension capability of the side-mirror housing. When the housing is extended, the antenna is positioned in a location that does not require concealment behind metal structures, as the mirror housing itself provides the necessary positioning away from vehicle body metals. This dynamic positioning enables the system to take advantage of high-frequency technologies while avoiding their primary limitation.
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 configuration improves the accuracy and reliability of key fob detection and communication by expanding antenna coverage patterns and reducing signal interference, particularly when the side-mirror housings are retracted, allowing for better line-of-sight communication and reduced multipath reflections.
Implementation Method 1
When the first housing and the second housing are in the retracted position, the controller is configured to transmit first radio frequency (RF) signals via the first device and via the second device
Implementation Method 2
reducing signal interference, particularly when the side-mirror housings are retracted, allowing for better line-of-sight communication and reduced multipath reflections
Data Source
AI summary
The techniques of this disclosure relate to a system for transmitting radio frequency signals. The system includes a controller in communication with a first device fixed within a first housing attached to an exterior of a vehicle. The system also includes a second device fixed within a second housing attached to the exterior of the vehicle. The controller determines whether the first housing and the second housing are in a first position or in a second position. When the first housing and the second housing are in the first position, the controller transmits first radio frequency signals via the first device and via the second device. When the first housing and the second housing are in the second position, the controller transmits second radio frequency signals via the first device and via the second device. The system improves an antenna coverage area of the first device and second device.