EV Charging Current Control for PLC Timeout Recovery
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Solution Overview
Problem
Chargers that do not meet the Power Spectrum Density (PSD) standard for Power Line Communication (PLC) generate noise, leading to charging interruptions in electric vehicles, causing repeated stops and user discomfort.
Innovation Solution
A charging control method and device that reduce Control Pilot (CP) line noise by adjusting the charging current to prevent interruptions, allowing continuous charging without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the charging current is increased for quick charging, then the charging speed is improved, but the CP line noise increases causing PLC communication timeouts and charging interruptions
Solution Approach 1:
The patent implements dynamic adjustment of charging current based on real-time PLC communication status. The charging control device continuously monitors whether PLC messages are received within expected timeframes and adjusts the charging current accordingly - reducing current when communication timeouts occur and increasing it when communication is stable, thereby adapting the charging speed to communication conditions
Solution Approach 2:
The patent establishes a feedback mechanism where the charging control device monitors PLC communication status and uses this information to control charging current. The device determines whether a PLC message was received within a predetermined timeframe, and based on this feedback, adjusts the charging current to maintain both communication reliability and charging efficiency
2Reliability
If the PLC communication signal intensity is increased to overcome noise, then the communication reliability is improved, but the Power Spectrum Density standard is violated
Solution Approach 1:
The patent implements preliminary actions to prevent communication failures before they occur. The charging control device sends PLC messages at predetermined intervals before charging current increases, and monitors for timeouts in advance. This allows the system to proactively adjust charging current to prevent communication failures rather than reacting after interruptions occur
Solution Approach 2:
The patent changes operational parameters dynamically based on communication conditions. Instead of using fixed high signal intensity that would violate PSD standards, the system adjusts charging current as a proxy parameter to maintain communication reliability. When PLC communication fails, the system changes the charging current parameter to a lower level that reduces noise and restores communication
3Reliability
If the charging is stopped due to PLC timeout, then the communication error is prevented, but the charging continuity is disrupted causing user discomfort
Solution Approach 1:
The patent applies partial action by not completely stopping charging when communication issues occur. Instead of full charging interruption, the system partially adjusts the charging current while maintaining the charging process. This allows charging to continue at reduced levels during communication problems, preventing complete discontinuity while still addressing communication reliability concerns
Data Source
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AI summary
A charging control method of an electric vehicle includes: storing identification information and a charging stop current value of a charger, when charging is stopped due to a timeout of a Power Line Communication (PLC) communication message transmitted from the charger; confirming whether recharging is performed through the same charger as that when the charging is stopped by using the identification information of the charger, upon recharging; and adjusting a charging current of the charger based on the charging stop current value of the charger, when the recharging is performed through the same charger as that when the charging is stopped.