Integrated Vehicle Theft Deterrent System with Code Validation
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Solution Overview
Problem
Medium and heavy duty trucks lack effective theft deterrent systems due to simple electrical wiring and lack of integral security features, making them vulnerable to theft, and existing after-market devices are often easily defeated or malfunction, posing risks especially when transporting valuable or hazardous cargo.
Innovation Solution
An engine ignition system control system that includes a combination entry system for enabling codes, a vehicle body computer to validate codes, an engine controller for torque output control, and a disable relay in the ignition circuit, which limits engine output if an invalid code is entered, allowing local operation and preventing unauthorized vehicle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a combination entry system with code validation is implemented, then security against vehicle theft is improved, but device complexity increases
Solution Approach 1:
The patent combines the theft deterrent code validation system with the existing engine control unit (ECU) and ignition system. The body computer integrates both the code validation logic and the engine control functions, merging security and engine management into a single integrated system rather than adding a separate standalone device.
Solution Approach 2:
The body computer serves multiple functions: it validates the anti-theft code, controls the disable relay to prevent engine cranking, manages engine operation parameters, and communicates with various vehicle systems. This multi-functionality reduces the need for separate dedicated security devices.
2Reliability
If the ignition circuit is disabled by opening the power feed through a relay, then security is improved, but the vehicle becomes inoperative and difficult to service
Solution Approach 1:
The disable relay acts as an intermediary component in the ignition circuit. It is controlled by the body computer through the CAN bus network, allowing the system to maintain or disable ignition power remotely. This intermediary approach allows service personnel to simply reconnect the relay or reset the system without complex diagnostics of the entire security system.
Solution Approach 2:
The system provides feedback through audible and visual indicators when the ignition is disabled due to incorrect code entry. This feedback mechanism helps service personnel understand the system state quickly, reducing diagnostic time and making the system more service-friendly.
3Reliability
If after-market theft deterrent devices are installed, then security is improved, but the devices are easily spotted and defeated by experienced thieves
Solution Approach 1:
The security system is merged with the vehicle's existing body computer and engine control systems. The code validation logic is integrated into the body computer's existing processing capabilities, and the disable relay is incorporated into the standard ignition circuit wiring, making the security system indistinguishable from normal vehicle electronics.
Solution Approach 2:
The system uses the vehicle's existing communication infrastructure (CAN bus) and control networks for its operation, rather than requiring separate dedicated wiring and components. This self-integration approach makes the system appear as a normal part of the vehicle's electronic architecture.
4Reliability
If the engine crank circuit is interrupted to prevent theft, then security is improved, but emergency workers cannot start the vehicle in emergency situations
Solution Approach 1:
The system provides clear feedback through audible alarms and visual indicators when the ignition is disabled, allowing emergency workers to quickly understand the system state. The predictable behavior and clear status indication enable rapid response in emergency situations.
Solution Approach 2:
The disable relay serves as a controllable intermediary that can be remotely activated or deactivated. In emergency situations, authorized personnel can reset the system or provide alternative starting methods without permanent damage to the vehicle, balancing security with emergency adaptability.
Data Source
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AI summary
Vehicle theft deterrence is affected by requiring the entry of an enabling code to prevent disablement of vehicle operation. System operational variables may be programmed by operators. The system is substantially integrated with existing vehicle control systems.