EV Charging Noise Control via Dynamic Power and Cooling
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Solution Overview
Problem
Fast charging of motor vehicles often results in undesirable noise emissions, which can be unacceptable in noise-sensitive regions, despite the need for high charging power.
Innovation Solution
A method that limits maximum noise emissions by regulating the cooling device and charging power of motor vehicles during charging, using information from the charging point to ensure compliance with noise limits, either by controlling the cooling device or directly limiting charging power from the charging station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fast charging power is increased to improve charging speed, then charging power is improved, but noise emissions increase and become unacceptable in noise-sensitive regions
Solution Approach 1:
The charging power is made dynamically adjustable based on noise sensitivity information received from the charging point. The control unit continuously adapts the charging power level according to the received noise limit data, switching between different power levels (e.g., reduced power for noise-sensitive areas, full power for noise-tolerant areas). This dynamic adjustment resolves the contradiction by allowing high charging power when noise emissions are acceptable while reducing power when noise limits must be respected.
Solution Approach 2:
The system changes the operating parameters of the charging process based on external conditions. By receiving noise sensitivity information from the charging point and adjusting charging power accordingly, the system modifies its operational parameters (power level, charging current) to comply with local noise regulations. This parameter adaptation enables the system to achieve fast charging in appropriate locations while respecting noise constraints in sensitive areas.
2Temperature
If cooling power is increased to maintain battery temperature during fast charging, then cooling performance is improved, but noise emissions from cooling devices increase
Solution Approach 1:
The cooling device operates dynamically with adjustable power levels that respond to both thermal requirements and noise constraints. The control unit receives noise limit information and adjusts cooling power accordingly, reducing cooling intensity when noise emissions must be minimized while maintaining adequate temperature control. This dynamic operation allows the system to balance thermal management needs against noise emission limits in different environments.
Solution Approach 2:
The system applies partial cooling action when full cooling power would exceed noise limits. By providing just enough cooling to maintain acceptable battery temperature without exceeding noise thresholds, the system achieves adequate thermal management with reduced noise emissions. This partial action approach is sufficient in many operating conditions where extreme cooling is not required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for fast and efficient charging while minimizing noise emissions within acceptable limits, ensuring compliance with noise regulations and prioritizing noise reduction over other charging parameters.
Implementation Method 1
the motor vehicle to use the maximum noise limit value disclosed here to regulate or control the charging process, in particular to regulate or control the cooling device of the electrical energy storage device
Data Source
AI summary
A method for charging at least one electrical energy storage device of a motor vehicle includes (i) acquiring at least one piece of information regarding a charging point selected for the charging process; and (ii) limiting the maximum noise which the motor vehicle or the at least one electrical energy storage device may emit during the charging process, using the at least one piece of information.