Charging Current Profile Detection for Faulty Station Identification
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Solution Overview
Problem
Charging stations with faulty measuring devices continue to transmit inaccurate billing data, making it difficult to determine if a measuring device is defective, especially in a geographically dispersed network where comprehensive on-site diagnostics are impossible.
Innovation Solution
Record and store charging current profiles along with vehicle identifiers across multiple charging stations, allowing for centralized analysis to compare current charging data against historical profiles, and output a signal if deviations exceed a threshold, indicating potential faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate measurement devices are used to detect different current components, then measurement comprehensiveness is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions (detecting active current, reactive current, and harmonics) into a single measurement device. This single device uses one current sensor and a processing unit that can analyze different current components, thereby reducing device complexity while maintaining measurement comprehensiveness.
Solution Approach 2:
The measurement device is designed with multi-functionality to detect various current components including active current, reactive current, and harmonics. The processing unit can selectively measure different current profiles based on control signals, making the device universal and eliminating the need for multiple specialized devices.
2Measurement precision
If separate measurement devices are used for different current components, then measurement accuracy is improved, but switching complexity increases
Solution Approach 1:
The patent extracts the switching complexity from the physical device level to the control signal level. Instead of using physical switches to select different measurement devices, the system uses control signals to instruct a single measurement device to measure specific current components, thereby eliminating mechanical switching complexity while maintaining measurement accuracy.
Solution Approach 2:
The processing unit acts as an intermediary between the control unit and the measurement functions. It receives control signals specifying which current component to measure and coordinates the measurement process, eliminating the need for complex switching mechanisms while ensuring accurate measurement of the selected current profile.
3Reliability
If charging current is not monitored, then system simplicity is maintained, but battery safety and performance deteriorate
Solution Approach 1:
The measurement device automatically monitors charging current profiles and the control unit autonomously determines when to interrupt charging based on detected profiles. This self-service approach enables safety monitoring without requiring complex external control systems, as the system uses its own measurement and processing capabilities to ensure battery safety.
Solution Approach 2:
The system implements feedback by continuously monitoring charging current and using the detected profiles to control charging interruption. The measurement results feed back to the control unit, which adjusts charging operation accordingly, thereby ensuring battery safety through automated feedback control rather than complex external monitoring systems.
Data Source
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AI summary
A method for detecting profiles of charging currents for electric vehicles at charging stations, said method comprising the following steps: detecting a profile of a charging current at a charging station; storing the profile of the charging current together with a vehicle identification of the vehicle being charged. The method is characterised in that, for each vehicle identification, a profile of the charging current is stored at a plurality of charging stations, and in that for a vehicle identification a present profile of the charging current is compared with the stored profiles of the charging current at the plurality of charging stations, and a signal is output in the event of a deviation of the present profile of the charging current from the stored profiles of the charging current at the plurality of charging stations that is greater than a limit value.