Vehicle Immobilizer Architecture Hidden on CAN Bus and Analog Lines
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Solution Overview
Problem
Existing vehicle protection systems face reliability issues due to ease of detection and interference by attackers, limited service life of components, and complexity, which compromises their effectiveness and operational integrity.
Innovation Solution
A vehicle anti-theft protection system with a main unit connected to actuators via multiple signal lines (analog, digital, and wireless) that analyzes security conditions to immobilize the vehicle, using semiconductor switches and wireless communication to enhance reliability and conceal the system's presence, allowing for multi-stage protection without breaking standard vehicle bus conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromechanical relay is used to block vehicle movement, then the vehicle can be immobilized, but the system reliability decreases due to limited service life of the contact group and ease of detection by attackers
Solution Approach 1:
The patent replaces electromechanical relays with semiconductor switches that have no moving parts or contact groups. This substitution eliminates wear and extends service life while maintaining the immobilization function through electronic control of vehicle systems.
Solution Approach 2:
The patent introduces a microprocessor-controlled system that acts as an intermediary between the alarm trigger and the immobilization function. This intelligent controller analyzes signals, determines the nature of interference, and selectively activates protection mechanisms, improving reliability by avoiding false alarms and unnecessary immobilization.
2Reliability
If a relay-based protection system is used, then vehicle immobilization is achieved, but the system becomes easily detectable and interfered with by attackers using diagnostic devices
Solution Approach 1:
The patent changes the operational parameters of the protection system by using a microprocessor that can dynamically adjust system behavior based on detected threats. The system monitors diagnostic communication protocols and alters its response patterns to prevent attackers from predicting or bypassing protection mechanisms through standard diagnostic procedures.
Solution Approach 2:
The microprocessor-controlled system serves as an intelligent intermediary that analyzes communication patterns on vehicle buses and distinguishes between legitimate diagnostic access and theft attempts. This adds a layer of complexity that prevents easy detection and interference while maintaining system reliability.
3Reliability
If the standard vehicle CAN-bus is irreversibly broken to prevent theft, then protection is achieved, but the system complexity increases and vehicle functionality is compromised
Solution Approach 1:
The patent implements a dynamic protection system where the microprocessor can reversibly alter the state of vehicle systems based on threat detection. Instead of irreversible bus breaking, the system dynamically controls access to vehicle functions, allowing legitimate operations while preventing theft attempts, thereby reducing system complexity and maintaining vehicle functionality.
Solution Approach 2:
The microprocessor-controlled system performs multiple functions: it monitors diagnostic communication, detects theft attempts, controls immobilization functions, and manages system configuration. This multi-functionality eliminates the need for separate protection hardware and reduces overall system complexity while maintaining effective theft protection.
4Ease of operation
If a paging radio channel is used for remote control, then remote vehicle control is achieved, but the system reliability decreases due to possibility of channel blocking and lack of autonomy
Solution Approach 1:
The patent implements a self-service protection system where the microprocessor autonomously monitors vehicle systems, detects theft attempts, and activates protection functions without requiring external paging signals. This autonomy eliminates reliance on external communication channels, ensuring continuous operation and high reliability while maintaining remote control capability as an optional feature.
Data Source
AI summary
The invention relates to technology for protecting vehicles from unauthorized influence and can be used for installation on vehicle models equipped with a standard multiplex data exchange bus between electronic units and functional parts of the vehicle. The technical results consist in increasing the efficiency of vehicle protection against theft and increasing the reliability of the protection system. The main unit and actuators are connected without breaking the conductors to the standard digital line of the vehicle and to the analog line of the vehicle. The operating algorithm makes it difficult to determine the cause of vehicle immobilization.