Vehicle UHF Access Activation Using Smartphone Motion Signatures
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Solution Overview
Problem
The existing 'hands-free' access systems for motor vehicles using Bluetooth communication struggle with precise location detection of portable items like smartphones, leading to unreliable activation of vehicle functions such as locking and unlocking, due to imprecise RSSI measurements and interference, posing safety risks.
Innovation Solution
An ultra-high frequency communication method utilizing a smartphone's accelerometer to detect characteristic user movements and establish BLE communication, allowing for robust and ergonomic remote activation of vehicle functions by comparing accelerometer signals with predetermined signatures and transmitting commands only when communication is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth communication is used for hands-free access, then universal compatibility and low cost are achieved, but precise location detection and reliability deteriorate due to imprecise RSSI measurements and interference
Solution Approach 1:
The patent introduces an intermediary mechanism (motion detection algorithm and state machine) between the Bluetooth communication and the vehicle function activation. The smartphone's motion sensors detect characteristic movements (pickup, approach to vehicle) and the state machine validates the sequence of events, serving as a mediator that compensates for Bluetooth's imprecise location data and enables reliable hands-free access despite RSSI measurement limitations
Solution Approach 2:
The patent replaces the traditional mechanical/radio-based location detection system (RSSI measurements) with a motion-based detection system using the smartphone's accelerometer and gyroscope. Instead of relying on signal strength to determine proximity, the system detects characteristic mechanical movements of the smartphone as the user picks it up and approaches the vehicle, substituting one detection mechanism for another that is more reliable in the Bluetooth context
2Ease of operation
If RSSI measurements are used for location detection, then remote activation capability is achieved, but measurement precision and safety deteriorate due to signal interference and inaccurate distance determination
Solution Approach 1:
The motion detection system serves as an intermediary that validates the user's intent to activate remote functions. Instead of directly using imprecise RSSI measurements to trigger unlocking, the system detects characteristic motion patterns (smartphone pickup, approach movement) and uses these validated motion events as the trigger, eliminating the need for precise distance measurements while maintaining safe remote activation
Solution Approach 2:
The system performs preliminary motion detection and validation before activating remote vehicle functions. The state machine monitors and validates the sequence of motions (pickup, approach, pause) before the actual unlocking command is executed, ensuring that remote activation only occurs after proper user intent has been established through characteristic movements
3Reliability
If traditional RF and LF communication is used, then precise location detection and reliability are achieved, but adaptability deteriorates due to country-specific frequency requirements and lack of universal compatibility
Solution Approach 1:
The patent makes the hands-free access system universal by using Bluetooth communication, which operates on universally accepted frequency bands and does not require country-specific accreditation like RF and LF systems. The motion-based detection mechanism is also universal, working with any smartphone that has motion sensors, eliminating the need for country-specific frequency configurations while maintaining reliable location detection through motion patterns
Data Source
AI summary
An ultra-high frequency-based method for activating a function of a vehicle with a portable item of user equipment having an accelerometer. The method including the following steps: Comparing signals from the accelerometer with a predetermined signature; Detecting a characteristic movement of the portable item of equipment, associated with a command to activate a function of the vehicle, performed by the user on the basis of the result of the comparison; Checking the establishment of ultra-high frequency communication between the portable item of equipment and the vehicle, i) If communication is established, then transmitting a command to activate the function of the vehicle to the vehicle in order to activate said function, ii) If not, if communication is not established within a predetermined time interval following detection of the characteristic movement, then the method is stopped.