Wireless Power Transfer Pairing During EV Fine Positioning
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Solution Overview
Problem
In magnetic field-based wireless power transfer systems, there is a risk of incorrect connection between an electric vehicle communication controller (EVCC) and a supply equipment communication controller (SECC) during the fine positioning procedure, leading to inefficient re-initiation of the pairing and positioning process.
Innovation Solution
A method that combines the pairing procedure with the fine positioning procedure by transmitting specific messages and signals, including a fine positioning request message with an identifier of a first antenna and operating frequency, and dynamically calculating the position of a primary device based on low-frequency signal strength, to ensure accurate alignment and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pairing procedure is performed separately from the fine positioning procedure, then the pairing can be completed, but the risk of incorrect connection increases and the overall process becomes less efficient
Solution Approach 1:
The patent combines the pairing procedure with the fine positioning procedure into a single integrated process. The pairing request message is transmitted within the fine positioning message framework, allowing both procedures to execute simultaneously rather than sequentially, thereby improving efficiency while maintaining connection accuracy through the integrated verification process
2Adaptability or versatility
If the fine positioning request message includes information on multiple compatible SECCs, then the EV can find a suitable SECC, but the risk of connecting to the wrong SECC increases
Solution Approach 1:
The patent implements a feedback mechanism where the SECC responds to the fine positioning request with a fine positioning response message that includes a response code indicating whether the connection is successful. This feedback allows the EVCC to verify if it has connected to the correct SECC before proceeding, enabling it to handle multiple compatible SECCs while maintaining connection accuracy through verification
3Ease of operation
If the EV connects to a wrong SECC, then the connection is established, but the EV cannot detect the error until fine positioning fails
Solution Approach 1:
The patent enables error detection by incorporating a response code in the fine positioning response message from the SECC to the EVCC. This feedback mechanism allows the EVCC to immediately detect whether the connection is correct or incorrect during the fine positioning procedure, rather than only discovering errors after completion
Solution Approach 2:
The patent performs verification of the connection correctness as a preliminary action within the fine positioning procedure itself. By checking the response code before completing the pairing, the system prevents proceeding with incorrect connections, thereby improving error detection capability while maintaining ease of operation
4Reliability
If the EV has to terminate and restart the fine positioning procedure when connection error is detected, then correct connection can be achieved, but the process becomes very inefficient
Solution Approach 1:
The patent performs the verification of connection correctness as a preliminary action within the fine positioning procedure itself, using the response code feedback. By detecting and handling connection errors during the initial fine positioning exchange rather than after completion, the system avoids the need to terminate and restart the entire procedure, thereby reducing reconnection time while maintaining connection accuracy
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 approach effectively prevents incorrect connections and simplifies the pairing process, reducing errors and repetitive tasks, thereby enhancing user convenience and increasing the efficiency of the wireless power transfer system.
Implementation Method 1
transmitting an LF signal to a primary device of the first EVSE
Implementation Method 2
magnetic field-based wireless power transfer (WPT) system
Data Source
AI summary
Disclosed is a wireless power transfer pairing method and apparatus for concurrently performing a pairing procedure in a V2G WPT fine positioning procedure. The wireless power transfer pairing method comprises a step of, when an LF signal indicating that a secondary device of an electric vehicle is positioned within an alignment tolerance area on a primary device of an electric vehicle power supply device is detected, parking the electric vehicle, transmitting, to a supply equipment communication controller (SECC), a fine positioning request message in which a result code parameter is configured as a success, and transmitting, immediately after receiving from the SECC, a fine positioning response message in which a response code parameter is configured as OK, a pairing request message in which an identifier code parameter is configured as a pairing identification code and an EV processing parameter is configured as termination, to the SECC.