Vehicle Theft Prevention Device Voltage-Based Authentication
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Solution Overview
Problem
Existing vehicle theft prevention systems face challenges in balancing reliability and convenience, as increasing the number of authentication devices can limit communication time and reduce the vehicle's commercial value, while simply limiting functions may not effectively prevent theft.
Innovation Solution
A theft prevention device and method that includes an engine control unit, an authentication control unit, a voltage detection unit, and a first control unit, where the authentication control unit performs first and second code authentications only when the detected voltage is below a predetermined value, using a network separate from the engine control unit's circuit to enhance security without hindering normal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of authentication devices is increased, then theft prevention capability is improved, but communication time required for authentication is limited
Solution Approach 1:
The patent divides the authentication process into two distinct stages: first code authentication between the authentication control unit and engine control unit, and second code authentication between the authentication control unit and first control unit. This segmentation allows authentication to be performed across different networks (S-NET and F-CAN) with different communication time characteristics, resolving the contradiction between enhanced security and communication time constraints
Solution Approach 2:
The patent introduces a new dimension to authentication by performing code verification not only on the traditional engine control network but also on a separate network connecting to other control units. This multi-dimensional approach expands the authentication scope without proportionally increasing communication time on any single network
2Reliability
If the number of authentication devices is increased, then theft prevention capability is improved, but convenience in normal use deteriorates
Solution Approach 1:
The patent dynamically adjusts the authentication process by detecting voltage levels to determine whether to perform second code authentication. When voltage is at a predetermined level or higher, only first code authentication is performed for convenient normal use. When voltage drops below the threshold, second code authentication is added to prevent theft during suspicious conditions, thus balancing convenience and security dynamically
3Reliability
If functions of the vehicle are limited to prevent theft, then theft prevention capability is improved, but commercial value deteriorates
Solution Approach 1:
The patent changes the parameter of authentication activation based on voltage detection rather than permanently limiting vehicle functions. By monitoring voltage levels and condition flags, the system selectively enables enhanced authentication only when needed, maintaining full vehicle functionality and commercial value during normal operation while providing theft prevention when suspicious conditions are detected
Data Source
AI summary
A theft prevention device includes an FI-ECU that controls starting of an engine, a BCM that performs first code authentication between the BCM and the FI-ECU, a voltage detection unit that detects a voltage supplied from a power supply to the FI-ECU or the BCM, and a control unit that performs second code authentication with the BCM and controls a device VSA that is different from the FI-ECU. The BCM performs authentication with the control unit only when the voltage detected by the voltage detection unit indicates a predetermined value or less.