Vehicle Door MEMS Sensor Audio Noise Cancellation
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Solution Overview
Problem
Vehicle doors generate undesirable noise frequencies during closure due to vibrations, material engagements, and misalignment, which can be uncomfortable for users.
Innovation Solution
A micro-electromechanical sensor system is integrated into the vehicle door to measure movements and communicate with a processor, which determines door-operating events and emits corresponding audio signals to enhance the closure sound and cancel out unwanted noise frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a micro-electromechanical sensor system is integrated into the vehicle door to measure movements and emit audio signals, then the sound quality and closure sound are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated system: the micro-electromechanical sensor measures door movement, the processor analyzes the movement data to determine door-operating events, and the speaker emits audio signals. This merging of sensing, processing, and actuation functions into one cohesive system improves sound quality while managing complexity through functional integration rather than separate components.
Solution Approach 2:
The micro-electromechanical sensor system serves multiple purposes: it measures door movement for audio signal generation, detects door closure events, and provides data for determining door position and operational status. This multi-functionality allows the same hardware infrastructure to support various features, improving sound quality without proportionally increasing device complexity.
2Object-affected harmful factors
If audio signals are emitted to drown out undesirable noise frequencies, then the harmful noise is reduced, but the use of energy increases
Solution Approach 1:
The system emits audio signals periodically based on door movement events rather than continuously. The processor determines door-operating events from sensor data and triggers audio signal emission only at relevant moments (e.g., during door closure). This event-driven, periodic operation reduces energy consumption compared to continuous audio emission while still effectively counteracting undesirable noise frequencies when needed.
Solution Approach 2:
The system uses the energy required to emit audio signals to transform the harmful effect of undesirable noise frequencies into a beneficial outcome. By generating audio signals that counteract unwanted noise, the energy consumption is converted into a useful function that improves overall sound quality and reduces harmful noise, rather than being wasted.
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
The system effectively drowns out undesirable noise frequencies by emitting a pleasing audio signal synchronized with the door's movement, improving the closure sound and reducing discomfort for occupants and external noise.
Implementation Method 1
A rotational acceleration of the door is measured as the door moves into a closed position
Implementation Method 2
The speaker delivers a corresponding audio signal in response to the corresponding door-operating event
Data Source
AI summary
A vehicle includes a three-axis accelerometer attached to a door and in communication with a processor. A speaker is in communication with the processor. Operation of the door toward a closed position is measured by the accelerometer to define a corresponding door acceleration. The processor determines a corresponding door-operating event based on the corresponding door acceleration and the speaker delivers a corresponding audio signal in response to the corresponding door-operating event.