EV Charging Profile Adjustment via Actual Power Feedback
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Solution Overview
Problem
The actual achievable charging power of electric vehicles often differs from the theoretically maximum power communicated during the charging process, affecting the quality of energy management system (EMS) prognosis and optimization.
Innovation Solution
An energy management device dynamically configures the maximum power value based on online measurements of actual charging power, allowing for real-time reconfiguration of the charging profile to match actual energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum possible power consumption Pmax is communicated during the charging process according to ISO/IEC 15118, then the energy management system can plan charging operation, but the actually achievable charging power Pmax-act often differs from the transmitted theoretical maximum power Pmax, reducing prognosis quality
Solution Approach 1:
The patent implements a feedback mechanism where the energy management system continuously monitors the actual charging power Pmax-act during the charging process and compares it with the initially communicated maximum possible power consumption Pmax. Based on this feedback, the system dynamically adjusts the charging profile to match actual conditions, thereby improving prognosis quality and eliminating the discrepancy between theoretical and actual power values.
Solution Approach 2:
The patent transforms the static charging profile into a dynamic one by enabling real-time adjustments based on actual charging conditions. The energy management system modifies charging parameters during operation to reflect the actual achievable power Pmax-act, making the charging process adaptive rather than fixed, which resolves the contradiction between planned and actual power consumption.
2Ease of operation
If the charging profile is configured based on predetermined maximum power Pmax, then charging operation can be planned, but reconfiguration may be needed when actual power consumption differs, increasing system complexity
Solution Approach 1:
The patent applies preliminary action by pre-configuring the charging profile with the maximum possible power consumption Pmax as communicated during the charging process. This initial configuration enables charging operation planning before the actual charging begins, providing a baseline plan that can then be adjusted if needed based on actual conditions.
Solution Approach 2:
The system uses feedback to determine whether reconfiguration is necessary by continuously monitoring actual charging power against the predetermined maximum. Only when discrepancies are detected does the system perform reconfiguration, thereby maintaining ease of operation through pre-planning while avoiding unnecessary complexity from constant adjustments.
Data Source
AI summary
An energy management device for controlling a charging control appliance in an electric vehicle is provided. The energy management device is designed to adjust a charging profile in the charging control appliance for the charging of a battery of the electric vehicle on a charging station or in the electric vehicle itself, the adjustment of the charging profile at least taking into account a planned time of use of the electric vehicle and a desired charging state of the battery as well as a pre-defined value for the maximum charging capacity of the electric vehicle. The energy management device is coupled to a measuring unit which is designed to measure an actual charging capacity provided for the electric vehicle by the charging station and, independently or as a result of a request from the energy management device, transmit same to the energy management device. The energy management device is designed to use the value of the actual charging capacity for a corresponding new adjustment of the charging profile.