Vehicle Key Communication Blocking for Secure In-Car Locking

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Solution Overview

Problem

Existing electronic key systems for vehicles are vulnerable to theft when the user terminal is left inside the cabin, as they do not secure the vehicle effectively in such scenarios.

Innovation Solution

A vehicle key system that stops communication between the user terminal and the vehicle when the user terminal is inside the vehicle cabin during locking, enhancing security by preventing unauthorized engine start.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the electronic key system allows the user terminal to be left inside the vehicle cabin, then the user can engage in outdoor activities without worrying about carrying the key terminal, but the vehicle becomes vulnerable to theft as the system cannot lock the vehicle when the key terminal is present inside

Engineering Contradiction:

Improveconvenience of leaving key terminal inside vehicleVSAvoidsecurity of vehicle locking

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary detection to determine whether the user terminal is inside or outside the vehicle before executing the locking operation. When the terminal is detected outside, the system preemptively establishes communication blocking, preventing any subsequent unauthorized engine start attempts. This advance preparation resolves the contradiction by enabling secure locking while the terminal is outside, thus allowing the user to leave the terminal inside the vehicle with confidence.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system introduces communication blocking as an intermediary mechanism between the user terminal and the vehicle's engine control. When the terminal is detected outside the vehicle, the system blocks communication channels (such as CAN bus or diagnostic ports) that would otherwise allow the terminal to start the engine. This intermediary blocking mechanism enables the vehicle to be locked securely even when the terminal is inside the cabin, resolving the security concern while maintaining convenience.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the system blocks communication between the user terminal and vehicle when the terminal is outside, then the vehicle security is enhanced against unauthorized engine start, but the user cannot lock the vehicle using touch sensor from outside

Engineering Contradiction:

Improvesecurity against unauthorized engine startVSAvoidconvenience of locking from outside vehicle

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the communication blocking state based on the detected position of the user terminal. When the terminal is outside the vehicle, communication blocking is activated to prevent unauthorized engine start. When the terminal is inside the vehicle, communication blocking is deactivated to allow normal locking operations via touch sensor. This dynamic adjustment resolves the contradiction by adapting the security measure to the actual operational context.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the system detects user terminal outside vehicle and blocks communication, then theft prevention is improved, but the device complexity increases due to additional detection and control mechanisms

Engineering Contradiction:

Improvetheft prevention capabilityVSAvoidcomplexity of detection and control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses the existing proximity detection capability, originally designed for keyless entry and engine start control, to also determine whether the terminal is inside or outside the vehicle for locking operations. By making this existing sensor system multi-functional, the patent avoids adding dedicated detection hardware, thus resolving the contradiction between improved theft prevention and increased device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses the vehicle's existing communication infrastructure and control units to implement the communication blocking function. Rather than introducing entirely new hardware, the patent repurposes existing components (such as the in-vehicle communication device and engine control unit) to perform the additional security function. This self-service approach minimizes the increase in device complexity while achieving improved theft prevention.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12441273B2Vehicle key system and vehicle locking method

Publication Date: 2025.10.14 SUBARU CORP

AI summary

A vehicle key system is configured to change a lock status of a vehicle through communication performed between a user terminal and the vehicle. The vehicle key system includes one or more control circuits. The user terminal includes a terminal communication unit. The terminal communication unit is configured to communicate with the vehicle. The vehicle includes a vehicle communication unit and a vehicle opening-and-closing unit. The vehicle communication unit is configured to communicate with the user terminal. The one or more control circuits is configured to cause communication between the terminal communication unit and the vehicle communication unit to be stopped when an operation for putting the vehicle opening-and-closing unit into a locked state is performed, with the user terminal placed inside the vehicle.