Active Noise Cancellation for Electric Vehicle Charging Systems
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Solution Overview
Problem
Electric and hybrid vehicles generate significant noise during charging due to cooling and power electronics systems, which can disturb users, especially in densely populated areas, and existing solutions do not effectively address this issue.
Innovation Solution
A method using sound recording and output apparatuses on the vehicle to detect and generate anti-phase sound, reducing noise pollution by emitting sound waves that cancel out noise from the vehicle's own components, such as fans, allowing for real-time adaptation to changing noise sources and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high charging currents (500 A) are used to achieve short charging times, then charging speed is improved, but heat generation and noise from cooling fans increase
Solution Approach 1:
The patent converts the harmful noise from cooling fans into a detectable signal that can be actively canceled. By using sound recording apparatus to detect fan noise and sound output apparatus to generate anti-phase sound waves, the system transforms the harmful acoustic emission into a controlled counter-signal that eliminates the noise, thereby converting a harmful byproduct of high-power charging into a manageable parameter.
Solution Approach 2:
The system applies preliminary anti-action by generating anti-phase sound waves in advance to counteract the noise from cooling fans before it propagates and disturbs users. The sound output apparatus emits counter-sound waves that interfere destructively with the original noise, preemptively neutralizing the harmful effect rather than reacting to it after occurrence.
2Temperature
If cooling power is increased to dissipate heat from high charging currents, then thermal management is improved, but noise disturbance to users increases
Solution Approach 1:
The patent transforms the harmful noise generated by high-power cooling systems into a detectable and cancelable signal. By recording the cooling fan noise and generating anti-phase sound waves, the system converts the harmful acoustic disturbance into a controlled counter-signal, allowing aggressive cooling to be applied without compromising user comfort.
Solution Approach 2:
The sound output apparatus acts as an intermediary between the cooling system and the user environment. Rather than directly reducing cooling power (which would compromise thermal management), the system introduces an intermediary acoustic field that neutralizes the noise transmission path, allowing full cooling performance while protecting users from noise disturbance.
3Ease of operation
If charging infrastructure is centralized in densely populated areas, then accessibility is improved, but noise disturbance to customers increases
Solution Approach 1:
The patent enables centralized charging infrastructure in noise-sensitive urban areas by converting the harmful noise output into a cancelable signal. The active noise control system transforms the unavoidable fan noise from high-power charging operations into detectable and counteractable sound waves, making centralized urban charging feasible without disturbing nearby residents.
Solution Approach 2:
The system changes the acoustic parameter of the charging environment by introducing anti-phase sound waves that alter the net sound pressure level. This parameter change allows the charging station to operate at high power in urban settings by dynamically adjusting the acoustic field to maintain acceptable noise levels despite the presence of high-power cooling systems.
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
Effectively reduces or eliminates background noise during charging, enhancing user experience by minimizing noise disturbance and compliance with emission guidelines in residential and sensitive areas, without requiring additional hardware beyond existing sound systems.
Implementation Method 1
generating anti-phase sound by means of at least one sound output apparatus, which is attached to the vehicle, depending on a signal recorded by the sound recording apparatus
Data Source
AI summary
A method for active noise reduction in an electric or hybrid vehicle includes (i) detecting noise in an area surrounding the vehicle by at least one sound recording apparatus which is attached to the vehicle, and (ii) generating anti-phase sound by at least one sound output apparatus, which is attached to the vehicle, depending on a signal recorded by the sound recording apparatus. The generated anti-phase sound is generated with respect to a portion of the noise in the area surrounding the vehicle and is output into the area surrounding the vehicle. Also described is a corresponding electric or hybrid vehicle which is designed to perform active noise reduction with respect to its ambient noise.