Passive Vehicle Access System Using Motion Sequence Detection
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Solution Overview
Problem
Existing passive entry systems for motor vehicles are not sufficiently secure against relay station attacks and lack user convenience, as they only rely on acceleration sensors to activate and deactivate radio communication without utilizing the sensor's full potential for detecting movement sequences.
Innovation Solution
The method enhances user convenience and security by using an acceleration sensor to detect and store predefined movement sequences, allowing specific actions like unlocking or locking the vehicle based on recognized patterns, and assigning different functions to various sequences, while also securing against relay station attacks by putting the ID transmitter into a sleep mode if inactive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ID transmitter is put into sleep mode to prevent relay station attacks, then security is improved, but user convenience deteriorates due to delayed response when the user approaches the vehicle
Solution Approach 1:
The system performs preliminary detection of user approach through motion sensors and proximity sensors before activating radio communication. This allows the ID transmitter to wake up in advance of the actual authentication request, maintaining security by not being continuously active while ensuring user convenience by being ready when needed.
Solution Approach 2:
The system uses feedback from motion sensors, proximity sensors, and sensor fusion algorithms to dynamically determine when to activate or deactivate radio communication. This feedback mechanism ensures the system responds appropriately to user presence while maintaining sleep mode when no user is nearby, balancing security and convenience.
2Ease of operation
If the acceleration sensor continuously monitors for user presence, then user convenience is improved, but energy consumption increases
Solution Approach 1:
The acceleration sensor operates in a periodic manner, alternating between active monitoring phases and low-power sleep phases. The sensor activates periodically to check for user presence and then returns to sleep mode, reducing overall energy consumption while still providing timely detection of user approach.
Solution Approach 2:
The system uses low-power preliminary detection methods (motion sensors, proximity sensors) before activating the higher-power acceleration sensor and radio communication. This staged approach allows the system to maintain energy efficiency while still providing convenient user detection.
3Ease of operation
If the ID transmitter remains active to ensure immediate response, then user convenience is improved, but security against relay station attacks deteriorates
Solution Approach 1:
The system uses feedback from multiple sensors (motion, proximity, acceleration) to dynamically control radio communication activation. This feedback mechanism ensures the system only communicates when genuine user presence is detected, preventing relay station attacks while maintaining immediate response for legitimate users.
Solution Approach 2:
The system dynamically adjusts its operational state based on real-time sensor input, transitioning between active and sleep modes as needed. This dynamic behavior allows the system to be responsive to legitimate users while maintaining security by not being continuously vulnerable to attacks.
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 approach increases user convenience and security by enabling flexible and personalized movement sequences for vehicle functions, effectively preventing relay station attacks and enhancing the overall usability of the passive entry system.
Implementation Method 1
a sensor, in particular an acceleration sensor, which senses a user movement sequence of the ID transmitter
Implementation Method 2
carries out radio communication, in particular in the LF range, with a motor vehicle control unit arranged in the motor vehicle
Data Source
AI summary
The invention relates to a method for operating a passive access system for a motor vehicle with an ID transmitter which unlocks and/or locks the motor-vehicle using radio communication, in particular in the LF range, with a motor vehicle control unit arranged in the motor vehicle.