EV-Grid Message Sequencing for Early Charging Renegotiation
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Solution Overview
Problem
Current charging systems between electric vehicles and grids lack the ability to quickly change communication states in response to changes in charging conditions or environments during the charging process, limiting adaptability and efficiency.
Innovation Solution
An early renegotiation method and apparatus that allow electric vehicles to quickly change communication states by receiving service detail or vehicle positioning setup response messages, searching for compatible charging parameters or methods, and transitioning through specific states (service detail, vehicle positioning, or authorization setup) within preset timeout periods, using established TLS connections and message sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the EV follows the standard message sequence in ISO 15118-20, then the charging process maintains standardized communication protocols, but the system cannot quickly change communication states in response to changes in charging conditions or environments
Solution Approach 1:
The patent applies preliminary action by performing service renegotiation before the charging process is fully established. The EV initiates renegotiation during the service detail state or vehicle positioning setup state, before transitioning to authorization or charging states. This allows the communication parameters to be adjusted in advance, enabling quick adaptation to changing conditions without disrupting the overall standardized message sequence framework
Solution Approach 2:
The patent implements dynamics by making the message sequence flexible and adaptable. Instead of following a rigid standardized sequence, the EV can dynamically transition between states (service detail state, vehicle positioning setup state, authorization setup state) based on real-time charging conditions. The system allows early renegotiation that modifies the communication state transitions, making the otherwise static protocol dynamic and responsive to environmental changes
2Adaptability or versatility
If the EV transitions through multiple states for service renegotiation, then the system can adapt to incompatible charging parameters, but the charging process takes longer due to additional state transitions
Solution Approach 1:
The patent applies skipping by allowing the EV to rush through certain state transitions during renegotiation. When incompatibility is detected, the EV can skip directly to the authorization setup state or charging state after performing necessary renegotiation, rather than methodically transitioning through every intermediate state. This reduces the time penalty while still achieving parameter compatibility through targeted state changes
3Reliability
If the EV performs service discovery and establishes TLS connection before charging, then secure communication is established, but the system lacks flexibility to renegotiate services during the charging process
Solution Approach 1:
The patent applies continuity of useful action by maintaining the TLS connection and communication channel throughout the entire charging process. Instead of establishing security once and ending it, the system continuously maintains the secure channel, allowing renegotiation of services to occur within the existing secure framework. The useful action of secure communication continues uninterrupted while enabling flexible service adjustments through early renegotiation mechanisms
Data Source
AI summary
An early renegotiation method and apparatus are capable of quickly changing a communication state in changing a charging condition or charging environment, which can occur while performing a message exchange or a charging process between an electric vehicle and a grid. A method by which the electric vehicle performs early renegotiation in a message sequence between the electric vehicle and the grid includes steps of: receiving a service detail response message from a power supply device communication controller; searching for parameters that are compatible for direct current charging or alternating current charging; state-changing a service detail state into a vehicle positioning setup state for vehicle positioning by using automatic connection device or wireless power transmission, if compatible parameters cannot be found; and transmitting a vehicle positioning setup request message to the power supply device communication controller in the vehicle positioning setup state.