EV Charging Error Detection via Current Modulation
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Solution Overview
Problem
Current electric vehicle charging systems, particularly for heavy vehicles like buses and trucks, face challenges in safely and efficiently detecting errors during the charging process, which can lead to overheating, overcharging, or safety risks for personnel and equipment.
Innovation Solution
A method involving a vehicle control unit requesting a charging pattern from an external power supply, with a predetermined modulation applied to the charging current, allowing for real-time evaluation of the charging pattern to detect errors and trigger an alarm or automatic disconnection if discrepancies are found.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high charging current is supplied to the energy storage system, then the charging speed increases, but the risk of overheating and safety hazards increases
Solution Approach 1:
The patent applies periodic modulation to the charging current by superimposing a test signal with a specific frequency on the charging current. This periodic action allows the system to detect errors by analyzing the response at the modulation frequency, enabling safe high-speed charging with real-time monitoring to prevent overheating and other hazards.
2Reliability
If error detection methods are implemented during charging, then safety is improved, but the charging process complexity increases
Solution Approach 1:
The patent implements feedback by modulating the charging current with a test signal and measuring the voltage response. The control unit analyzes the measured signal at the modulation frequency to detect errors in the charging process. This feedback mechanism provides reliable error detection while maintaining relatively simple system architecture by utilizing existing charging control components.
Data Source
AI summary
A method for error detection during charging of an energy storage system in a vehicle is provided, the vehicle including an electric machine which is arranged for propulsion of the vehicle. The method includes requesting a charging pattern from an external power supply, by a vehicle control unit, upon connection of the energy storage system to the external power supply; and supplying the charging pattern to the energy storage system by an external charging control unit forming part of the external power supply. The method furthermore includes providing a predetermined modulation of the requested charging pattern; evaluating whether the charging pattern supplied to the energy storage system includes the predetermined modulation; and, if this is not the case, indicating that the charging of the energy storage system is erroneous. An arrangement for error detection during charging of an energy storage system, and a vehicle including an electric machine and having such an arrangement are also provided.