Non-Contact Power Transfer Authentication for Moving Vehicles
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Solution Overview
Problem
In contactless power transmission to moving vehicles, the short time required for the vehicle to pass through the power transmitting coil can lead to unstable communication and improper power transmission, resulting in inefficiencies and potential abnormalities.
Innovation Solution
A non-contact power transmission system that includes an in-vehicle communication device, a power receiving device, and a control device. The control device acquires key information before reaching the power transmission section and initiates power transmission only after verification, allowing for independent power control on the receiving side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power transmission is performed during the short time a vehicle passes through the power transmitting coil, then power transmission speed is improved, but communication stability deteriorates
Solution Approach 1:
The system performs authentication and communication establishment before the vehicle reaches the power transmission zone. The OBU and roadside communication device exchange authentication information in advance, and the control device prepares the power transmission system before the vehicle enters the charging area, ensuring communication is stable before power transfer begins
Solution Approach 2:
The process is divided into distinct phases: authentication phase (before vehicle reaches power transmission section), communication establishment phase, and power transmission phase. This segmentation allows each phase to be optimized independently, with sufficient time allocated for communication and authentication before the brief power transmission window
2Loss of time
If power transmission starts immediately when vehicle enters power transmission section, then response time is improved, but power control accuracy deteriorates
Solution Approach 1:
The control device receives authentication information and establishes communication before the vehicle enters the power transmission section. Power transmission parameters are predetermined based on authentication results, allowing immediate startup without compromising control accuracy
Solution Approach 2:
The system uses bidirectional communication between the OBU and roadside devices to exchange power transmission parameters and authentication information. This feedback loop ensures accurate power control by confirming vehicle identity and transmitting appropriate power levels before and during the power transfer process
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
Ensures appropriate and efficient power transmission by establishing secure communication and verifying key information before power transmission, thereby reducing inefficiencies and abnormalities associated with short vehicle passage times.
Implementation Method 1
a power receiving device that transfers and receives electric power transmitted in a non-contact manner between a power transmitting device and the power receiving device
Implementation Method 2
the control device may communicate by a voltage induced in a coil of the power transmitting device by a magnetic field generated in a coil of the power receiving device by a power switching operation of the power receiving device
Data Source
AI summary
A non-contact power transmission system includes an in-vehicle communication device, a power receiving device, and a control device. The in-vehicle communication device communicates with a roadside communication device placed around a traveling path of a vehicle. The power receiving device transfers and receives electric power transmitted in a non-contact manner between a power transmitting device and the power receiving device. The control device acquires key information through communication between the roadside communication device and the in-vehicle communication device before the vehicle reaches a power transmission section of the power transmitting device. The control device causes the power transmitting device to start power transmission in response to verification of the key information, by sending information having at least the key information to the power transmitting device, through communication between the power transmitting device and the power receiving device when the vehicle is present in the power transmission section.