EV Charging Pilot Signal Brand Identification Without Extra Hardware
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Solution Overview
Problem
Electric vehicle owners face challenges in identifying authorized charging stations that match their vehicle's specific battery chemistry, which can affect battery longevity and warranty extensions, necessitating a method for brand identification during recharging.
Innovation Solution
A system and method utilizing control pilot signals with pulse width modulation and variable resistance patterns to enable bidirectional brand identification between electric vehicles and charging stations, allowing them to recognize each other and ensure proper recharging while maintaining uninterrupted electrical flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bidirectional brand identification is implemented using control pilot signals, then battery health and warranty compliance are ensured, but system complexity increases
Solution Approach 1:
The control pilot signal serves multiple functions: it maintains uninterrupted electrical flow for charging while simultaneously encoding brand identification information through pulse width modulation. This multi-functionality allows the system to ensure battery health through brand matching without adding separate dedicated communication hardware, thus improving reliability while limiting complexity increase.
Solution Approach 2:
The patent uses the existing control pilot signal as an intermediary carrier to transmit brand identification information between the charging station and electric vehicle. By modulating this existing signal rather than creating a new communication channel, the system achieves reliable brand identification and battery protection without significantly increasing system complexity.
2Measurement precision
If pulse width modulation is used to encode brand information, then brand identification accuracy is improved, but signal complexity increases
Solution Approach 1:
The patent encodes brand identification information by changing the pulse width parameter of the existing control pilot signal. Different pulse widths represent different brand identifiers, allowing accurate brand recognition through simple parameter variation rather than complex signal structures. This approach improves identification accuracy while keeping signal complexity manageable.
3Measurement precision
If variable resistance patterns are implemented for vehicle-to-station identification, then brand recognition is improved, but electrical flow interruption risk increases
Solution Approach 1:
The patent implements brand identification through periodic toggling of variable resistance patterns during the charging process. These periodic changes occur within the existing control pilot signal framework, allowing the system to exchange brand identification information without interrupting the continuous electrical flow to the battery. The periodic nature of the resistance changes enables reliable brand recognition while maintaining uninterrupted charging.
Data Source
AI summary
A method for brand identification of an electric vehicle to a charging station includes connecting a plug of the charging station to a socket of the electric vehicle, receiving a control pilot signal at the socket from the charging station, terminating the control pilot signal in a variable resistance in the electric vehicle, and toggling the variable resistance in a vehicle pattern that transitions between two charging state resistances. The charging station detects the vehicle pattern and maps the vehicle pattern to a vehicle brand of the electric vehicle. The method includes receiving electrical current to recharge the electric vehicle at the socket.