EV Charging Meter Time Sync for Accurate Billing Records
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Solution Overview
Problem
Existing charging station systems for electric vehicles face challenges in ensuring accurate billing conforming to calibration laws due to clock drifts and lack of precise time synchronization between the charging station and the digital electricity meter.
Innovation Solution
Implementing a method that uses a digital time stamp from a trusted time server to adjust the meter time of the digital electricity meter before energy transfer, ensuring accurate billing by decoupling the clock drift between the charging station and the meter time, and using a QR code to transmit the charging process data set for user verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charging station uses its own internal clock for time stamping, then the system operation is simple, but clock drift occurs between the charging station and the meter time causing billing inaccuracies
Solution Approach 1:
The charging station receives a digital time stamp from a trusted time server before initiating the charging process. This preliminary time synchronization action ensures that the charging station's time reference is aligned with a trusted source, preventing clock drift issues that would otherwise occur with standalone internal clocks.
Solution Approach 2:
A trusted time server acts as an intermediary between the charging station and the meter time. The time server provides authoritative time references that both the charging station and the billing system can rely on, eliminating the need for direct time synchronization between the charging station and the meter while ensuring billing accuracy.
2Loss of information
If the charging station transmits detailed charging data to the user, then transparency and verification are improved, but data transmission complexity increases
Solution Approach 1:
Instead of transmitting the entire charging process data set directly to the user, the system creates a QR code that serves as a compact reference or copy of the essential charging information. The QR code contains or links to the charging process data set, allowing users to access detailed information through their mobile devices without requiring complex direct data transmission infrastructure.
Data Source
AI summary
The invention relates to a method for operating a charging station (1) having a digital electricity meter (3) for electric vehicles, whereby a current time of day is received by the charging station (1) as a digital time stamp (21), whereby a charging process is carried out by means of the charging station, wherebythe charging process is initiated, wherebyafter the initiation of the charging process, a meter time of day (23) of the digital electricity meter (3) is adjusted based on the digital time stamp (21), wherebyan energy transfer to an electric vehicle is carried out, wherebya charging process data set (25) is created by using the meter time of day (23), wherebythe charging process is ended.