EV Charging Communication Polling for Timeout-Stable Message Exchange
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Solution Overview
Problem
Existing communication systems for electric vehicles during fast charging procedures face issues with unintended termination of charging due to time-outs in message exchanges between the electric vehicle and the charging equipment.
Innovation Solution
A communication apparatus that performs a polling process by periodically checking for response messages from the charging equipment, with the polling time adjusted based on the history of time-out occurrences, using a control unit to determine the target polling time based on identified time-out flag values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication apparatus uses a fixed time-out mechanism for message exchange, then the charging procedure can terminate when a response is not received, but this causes unintended termination of charging when messages are delayed
Solution Approach 1:
The patent implements dynamic polling time adjustment by changing the polling interval based on the reception status of previous messages. When a message is received, the polling time is extended; when not received, it is shortened. This dynamic adaptation allows the system to differentiate between temporary delays and actual communication failures, preventing unintended charging termination while maintaining timely detection of real issues.
Solution Approach 2:
The patent employs a feedback mechanism where the polling time for subsequent messages is determined by the reception status of previous messages. The control unit adjusts the polling time based on whether the communication apparatus received the previous message within the expected time frame, creating a closed-loop control system that adapts to actual communication conditions and prevents false time-out terminations.
2Reliability
If the communication apparatus performs frequent polling to detect message reception, then communication reliability improves, but computational load increases
Solution Approach 1:
The patent reduces computational load by dynamically adjusting the polling frequency based on communication conditions. Instead of performing frequent polling regardless of message reception status, the system extends polling time when messages are successfully received and shortens it when messages are not received, thereby reducing unnecessary computational operations while maintaining reliable message detection.
Solution Approach 2:
The patent changes the polling time parameter adaptively based on message reception status. By modifying the polling interval duration according to whether previous messages were received within expected time frames, the system optimizes the balance between detection accuracy and computational efficiency, performing more polling only when necessary.
Data Source
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AI summary
Provided are a communication apparatus and a communication method for message exchange with charging equipment, and an electric vehicle comprising the communication apparatus. The communication apparatus includes a communication unit provided to be coupled to the charging equipment through a first communication channel, and a control unit coupled to the communication unit through a second communication channel. The control unit determines a target polling time based on a value set to a time-out flag associated with a request message, when transmitting the request message to the communication unit at a first time point. Subsequently, the control unit periodically checks whether a response message from the charging equipment is received by the communication unit at each target polling time for a waiting period from the first time point to a second time point at which a time-out time associated with the request message has passed from the first time point.