On-Vehicle Switch Signal Level Adjustment for Relay Attack Prevention
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Solution Overview
Problem
Existing on-vehicle apparatus control systems face challenges in maintaining communication performance between the on-vehicle control device and the portable machine while preventing relay attacks, which can compromise security and convenience, especially during passive entry methods.
Innovation Solution
The system employs a dual-switch mechanism on the vehicle, with one switch closer and one farther from the on-vehicle reception unit, and a level switch that adjusts the transmission intensity or reception sensitivity of signals based on the operated switch, ensuring secure communication by making it harder for relays to intercept signals during illegal attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission intensity of response request signal is increased to ensure reception by portable machine at distant positions, then communication reliability is improved, but relay attacks become easier to execute
Solution Approach 1:
The patent applies local quality by assigning different transmission intensity levels to different on-vehicle switches based on their locations. Switches closer to the reception unit use lower transmission intensity, while switches farther away use higher intensity. This localized differentiation ensures reliable communication for legitimate users at various positions while making relay attacks difficult, as the system can detect inconsistencies between expected and actual signal characteristics.
Solution Approach 2:
The patent implements dynamics by making the transmission intensity adjustable and switchable based on which on-vehicle switch is activated. The on-vehicle control device dynamically changes the transmission intensity of the response request signal according to the position of the operated switch, allowing the system to adapt to different communication scenarios and maintain security while ensuring reliable reception.
2Ease of operation
If multiple on-vehicle switches are provided at different positions, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing multiple on-vehicle switches that all trigger the same passive entry function but with different transmission intensity settings. Each switch serves the same functional purpose (initiating passive entry) but adapts the signal characteristics based on its location, allowing the system to handle multiple operational scenarios with a unified control mechanism.
Data Source
AI summary
An on-vehicle apparatus control system includes: a first on-vehicle switch and a second located farther from an on-vehicle reception unit than the first on-vehicle switch; an on-vehicle control device; and a portable machine. In a case where the on-vehicle switches is operated, the on-vehicle control device transmits a response request signal to the portable machine, the portable machine returns a response signal, and the on-vehicle control device controls an on-vehicle apparatus. The on-vehicle apparatus control system further includes a level switch. In a case where the first on-vehicle switch is operated, the level switch switches transmission intensity of a portable machine transmission unit or reception sensitivity of an on-vehicle reception unit to a first level, and in a case where the second on-vehicle switch is operated, the level switch switches the transmission intensity or the reception sensitivity to a second level higher than the first level.