Vehicle Key System Using Optical Signal Authentication
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Solution Overview
Problem
Current smart key systems for vehicles rely on wireless communication but lack robust anti-theft measures and efficient power management, particularly in scenarios where power sources may be compromised or stolen.
Innovation Solution
The vehicle key system employs a transmitting device with a signal emission module, light source module, and wireless charging receiver that uses optical signals with ID information for authentication and operates without a separate power source, utilizing a receiving device with an optical signal conversion controller and unlock module for secure locking and unlocking, while also incorporating a wireless charging system to prevent energy theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication is used for smart key authentication, then door opening is enabled without mechanical key, but anti-theft performance is insufficient
Solution Approach 1:
The patent introduces visible light as an intermediary carrier for ID information transmission. Instead of direct wireless communication between key and vehicle, the key modulates ID information onto visible light waves, which are then detected by the vehicle's optical receiver. This intermediary approach enhances security because visible light requires line-of-sight transmission and cannot penetrate walls, preventing relay attacks and unauthorized access.
2Reliability
If a separate power source is added to the transmitting device, then operational reliability is improved, but device complexity and energy theft risk increase
Solution Approach 1:
The patent makes the vehicle battery serve multiple functions: it powers both the vehicle's electrical systems and the transmitting device (smart key) through wireless energy transmission. The receiving device in the vehicle charges the transmitting device's power source inductively when in proximity, allowing the same power source to fulfill both vehicle operation and key operation needs, eliminating the need for a separate key battery while reducing overall system complexity.
3Use of energy by moving object
If wireless charging is implemented, then power management is improved, but unauthorized energy use may occur
Solution Approach 1:
The patent implements bidirectional authentication and verification mechanisms before enabling wireless charging. The receiving device verifies the ID information of the transmitting device through optical signal exchange, and only after successful authentication does the system enable inductive power transfer. This feedback loop ensures that only authorized devices can receive energy, preventing unauthorized draining of the vehicle battery while maintaining efficient power management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances anti-theft performance by enabling direct ID verification through visible light and ensures continuous operation without a separate power source, while preventing unauthorized energy use from the vehicle battery.
Implementation Method 1
a light source module configured to generate an optical signal with Identification (ID) information
Implementation Method 2
a wireless charging receiver configured to receive an electromagnetic signal for wireless charging
Data Source
AI summary
A vehicle key system includes a transmitting device issuing optical signals and a receiving device. The transmitting device includes a light source module. An optical signal with predetermined Identification (ID) information is generated by the light source module and the optical signal is converted into an electrical signal. A signal receiving module of the receiving device verifies the electrical signal and controls a vehicle to unlock. An electronic energy is converted into an electromagnetic signal and the electromagnetic signal is broadcast. A wireless charging receiver of the transmitting device receives the electromagnetic signal and generates the electronic energy. The present disclosure also provides a method for using the vehicle key system.