OBD-II Vehicle Immobilizer for Unauthorized Movement Detection
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Solution Overview
Problem
Existing vehicle anti-theft systems require hardwiring and are often ineffective in preventing theft, as they either rely on audible alarms or complex, expensive installations, and do not prevent unauthorized access to the vehicle's ignition system.
Innovation Solution
A vehicle anti-theft device that connects to the OBD-II port, using a hardware adapter with a gyroscope and controller to monitor unauthorized movement, authenticate drivers via a VIN code, and wirelessly disable the ignition system upon unauthorized attempts or improper authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vehicle alarm system is installed with sensors hardwired to monitor unauthorized entry or movement, then the vehicle security monitoring capability is improved, but the installation complexity and cost increase significantly
Solution Approach 1:
The patent uses the OBD-II port as an intermediary interface to connect the anti-theft device to the vehicle's existing diagnostic system. This mediator approach allows the device to access vehicle data and control functions without requiring hardwired connections to multiple sensors and components, thereby maintaining security monitoring capability while dramatically reducing installation complexity
Solution Approach 2:
The anti-theft device leverages the universal OBD-II port standard that is already present in modern vehicles. By using this multi-functional port that is designed for various diagnostic and maintenance purposes, the invention can access multiple vehicle systems (ignition, immobilizer, sensors) through a single interface, eliminating the need for separate hardwired connections to each system
2Object-affected harmful factors
If traditional audible alarm systems are used to deter theft, then the deterrent effect is provided, but thieves often ignore them and the system does not prevent unauthorized access to the ignition
Solution Approach 1:
The patent replaces the mechanical/audible alarm system with an electronic control system that communicates wirelessly with the vehicle's ignition system through the OBD-II port. Instead of relying on sound deterrents, the system electronically disables the ignition, providing actual prevention rather than just deterrence, thereby maintaining the deterrent effect while significantly improving prevention effectiveness
Solution Approach 2:
The system incorporates feedback mechanisms where the anti-theft device continuously monitors vehicle status through the OBD-II port and automatically responds to unauthorized access attempts by disabling the ignition. The system provides feedback to the owner via remote notifications and maintains real-time control over the vehicle's ignition state, creating a responsive prevention system that adapts to threats rather than relying on static audible alarms
3Reliability
If electronic anti-theft systems are implemented to disable the vehicle, then the prevention capability is improved, but the hardwiring requirement makes installation expensive and time-consuming
Solution Approach 1:
The OBD-II port serves as an intermediary that enables electronic anti-theft functionality without requiring direct hardwiring to the ignition system. The device communicates through this standardized interface to send disable commands to the vehicle's control units, maintaining full prevention capability while eliminating the need for complex electrical hardwiring and reducing installation to a simple plug-and-play connection
Data Source
AI summary
A vehicle anti-theft device for a vehicle has a hardware adapter removably attached to an OnBoard Diagnostic II (OBD-II) port of the vehicle. The hardware adapter monitors for unauthorized movement of the vehicle and allows only authorized individuals who enter an authorization code to the hardware adapter to drive the vehicle.