Smartphone-Based Vehicle Access System Using Head Unit Pairing
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Solution Overview
Problem
Smart key systems for vehicles are limited by the need for a physical fob, which can be lost or left behind, and have not adapted to the advancements in smartphone technology, resulting in a lack of integration with mobile devices for vehicle control.
Innovation Solution
A vehicle control method using a smartphone that pairs with a vehicle's head unit through Bluetooth, allowing authorization via a PIN code and enabling door unlocking and engine starting using CAN and SPP communication, eliminating the need for a physical fob.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical fob is used for smart key system, then the system is simple and reliable, but the driver may lose the fob or leave it at a place other than the vehicle
Solution Approach 1:
The patent replaces the physical fob with a virtual copy implemented as a smartphone application. The smartphone acts as a digital replica of the traditional fob, containing the same identification information and authentication capabilities. This allows the driver to access the vehicle using a device they already carry daily, eliminating the risk of losing a separate physical fob while maintaining system reliability through identical authentication mechanisms.
Solution Approach 2:
The smartphone application serves multiple functions: it acts as both the identification credential (replacing the fob) and the communication interface with the vehicle's head unit. The single device integrates both authentication and control functions, eliminating the need for a separate physical fob and providing universal access through a multi-functional device that drivers already possess.
2Adaptability or versatility
If smartphone application is adopted for vehicle control, then IT development is integrated and convenience is improved, but the system complexity increases
Solution Approach 1:
The patent introduces a head unit as an intermediary component between the smartphone application and the vehicle's existing control systems. The head unit receives authentication data from the smartphone, verifies it against stored credentials, and then communicates with the vehicle's door locks and engine control systems. This intermediary approach allows smartphone integration without requiring complex modifications to the vehicle's core systems, thereby managing system complexity while achieving IT integration.
Solution Approach 2:
The patent replaces the mechanical interaction of physical fob buttons and switches with electronic communication protocols. The smartphone application uses Bluetooth or other wireless communication to transmit authentication data, replacing the mechanical pressing of fob buttons. This substitution reduces mechanical wear and simplifies the user interface while integrating modern IT capabilities into the vehicle access system.
3Reliability
If PIN code authorization is implemented through smartphone, then security is enhanced and fob loss risk is reduced, but the operation time increases
Solution Approach 1:
The patent implements preliminary pairing between the smartphone and the vehicle's head unit during system setup. This initial configuration establishes trusted communication channels and pre-configures authentication parameters. When access is needed, the system leverages this pre-established connection to quickly verify the smartphone's identity before requesting the PIN code, reducing the overall authorization time while maintaining security through the two-factor authentication process.
Data Source
AI summary
A vehicle control method using a smartphone may include pairing a smartphone of a driver with a head unit of a vehicle, the head unit of the vehicle turning on an application in the smartphone through Bluetooth communication, authorizing the driver through the application in the smartphone, and the head unit unlocking a door of the vehicle through a smart key unit of the vehicle.