Parked EV Battery Reserve Control for Charging Station Reachability
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Solution Overview
Problem
In electrically driven vehicles, some consumers remain active even when parked, continuously drawing energy from the traction battery, which can lead to a reduced charging state, potentially preventing the vehicle from reaching a charging station.
Innovation Solution
A control device determines the charging state of the traction battery and calculates the energy requirement to reach a specified charging station, adjusting the power consumption of secondary consumers to ensure the battery is not discharged below a safe level, by limiting the closed-circuit current and deactivating non-essential functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical consumers remain active in a parked vehicle to provide security and communication functions, then vehicle safety and connectivity are improved, but the charging state of the traction battery continuously decreases
Solution Approach 1:
The control device dynamically adjusts the closed-circuit current limit based on the charging state of the traction battery and the calculated energy requirement to reach a charging station. This dynamic adaptation allows the system to optimize between maintaining consumer functions and preserving battery charge, resolving the contradiction between reliability and energy consumption.
Solution Approach 2:
The system continuously monitors the charging state of the traction battery and uses this feedback to adjust the maximum closed-circuit current. This feedback mechanism ensures that consumer functions are maintained only when sufficient battery charge is available, preventing excessive discharge while preserving essential functions.
2Ease of operation
If the vehicle is left parked for a longer period with consumers active, then convenience and functionality are maintained, but the risk of insufficient energy to reach a charging station increases
Solution Approach 1:
The control device calculates the energy requirement to reach a charging station in advance and compares it with the available battery energy before allowing consumers to remain active. This preliminary assessment prevents situations where the battery would be depleted before reaching a charging station, ensuring reliability while maintaining convenience.
3Reliability
If the closed-circuit current is restricted to preserve battery charge, then the ability to reach a charging station is improved, but the functionality of electrical consumers is reduced
Solution Approach 1:
The system changes the parameter of maximum closed-circuit current based on the charging state and energy requirements. By adjusting this electrical parameter, the system optimizes the balance between maintaining consumer functionality and ensuring sufficient energy to reach a charging station, resolving the contradiction between reliability and ease of operation.
Data Source
AI summary
The present invention relates to the control of the closed-circuit current in an electrically driven vehicle, i.e., the limitation of the maximum power consumption of consumers in a parked electric vehicle. For this purpose, the energy requirement for reaching a charging station is calculated. The maximum closed-circuit current in the electric vehicle is adjusted on the basis of the calculated energy requirement for reaching the charging station and the actual charging state.