Reflective Environment Detection for Vehicle PEPS Localization
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Solution Overview
Problem
Traditional passive entry/passive start (PEPS) systems using low-frequency signals face limitations in accurately determining the location of a key fob or user device beyond a few meters due to long wavelength issues and are not compatible with ubiquitous devices like smartphones, leading to unreliable communication and activation of vehicle functions.
Innovation Solution
A system utilizing a control module that broadcasts a ping signal and adjusts sensor measurements based on signal reflection information to determine the presence of reflective elements, allowing for accurate localization and calibration of sensors using consumer-grade wireless protocols like Bluetooth Low Energy (BLE), enabling communication with user devices and correcting signal measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-frequency signals are used for PEPS communication, then signal propagation allows for relatively accurate estimation of range and location within 2 meters, but communication reliability deteriorates beyond a few meters due to long wavelength issues
Solution Approach 1:
The patent introduces a reflective element as an intermediary object to reflect wireless signals between the vehicle and the user device. This mediator enables signal communication and measurement when direct line-of-sight is blocked or when devices are beyond direct communication range, resolving the reliability issue of long-distance LF communication
Solution Approach 2:
The patent replaces traditional mechanical key insertion with wireless signal-based authentication. By using wireless communication signals (including reflected signals) instead of physical key insertion, the system achieves contactless authentication while maintaining security and expanding operational range beyond traditional LF limitations
2Reliability
If traditional proprietary radio frequency systems are used for PEPS, then vehicle access control is secured, but compatibility with ubiquitous devices like smartphones is lost
Solution Approach 1:
The patent implements a universal authentication system that works across multiple device types (smartphones, wearables, traditional key fobs) by using standard wireless communication protocols. The system maintains security through encrypted authentication while adapting to various ubiquitous devices, achieving both security and versatility
Solution Approach 2:
The patent changes the communication parameters from proprietary radio frequencies to standard wireless protocols (such as Bluetooth Low Energy). This parameter change enables compatibility with ubiquitous devices while maintaining security through protocol-specific encryption and authentication mechanisms
3Measurement precision
If signal strength measurements are used for location estimation, then device positioning is achieved, but measurement errors occur due to signal reflections from environmental objects
Solution Approach 1:
The patent converts the harmful effect of signal reflections into a beneficial measurement tool. By intentionally introducing reflective elements and measuring the reflected signals, the system gains additional information about device location and environmental characteristics, transforming measurement errors into useful data for enhanced positioning accuracy
Solution Approach 2:
The patent implements feedback mechanisms where the system measures reflected signals and uses this information to correct location estimation algorithms. The feedback loop continuously refines position calculations by accounting for environmental reflections, improving overall measurement precision despite the presence of reflective interference
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 communication and accurate localization of user devices beyond traditional range limitations, allowing for seamless activation of vehicle functions and compatibility with diverse devices, improving the overall PEPS system's performance and user experience.
Implementation Method 1
the signal information indicates an amount of reflection of the ping signal measured by the plurality of sensors
Data Source
AI summary
Systems and methods are provided that include a control module of a vehicle. The control module instructs at least one of a beacon and a plurality of sensors to broadcast a ping signal in response to a user device being within a threshold distance of the vehicle. The plurality of sensors communicate signal information to the control module, and the signal information indicates an amount of reflection of the ping signal measured by the plurality of sensors. A sensor calibration module (i) determines a presence of a reflective element based on the signal information, and (ii) in response to determining the presence of the reflective element and the user device being connected to a communication gateway of the control module, adjusts a measurement of a first sensor of the plurality of sensors based on the signal information.