Vehicle Active Noise Control Virtual Reference Signal
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Solution Overview
Problem
Existing active noise control methods for vehicles degrade in performance due to reliance on a single coherence value from a single acceleration sensor, leading to suboptimal noise cancellation.
Innovation Solution
The active noise control apparatus calculates a virtual reference signal using multiple correlation analysis across multiple acceleration sensors, enhancing noise cancellation performance and reducing component installation costs by employing a noise collection unit, acceleration sensors, and a control unit that generates an active noise control signal based on selected coherence values and lookup table data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single acceleration sensor is used to calculate the active noise control signal, then the device complexity is reduced, but the active noise control performance deteriorates
Solution Approach 1:
The patent creates a virtual reference signal that copies and combines information from multiple acceleration sensors through correlation analysis. This virtual signal replicates the benefits of having multiple sensors without requiring physical installation of additional components, thereby improving noise control performance while avoiding increased device complexity
Solution Approach 2:
The patent introduces a virtual reference signal as an intermediary that mediates between multiple acceleration sensors and the active noise control algorithm. This intermediary consolidates information from multiple sensors into a single processed signal, allowing the system to leverage multiple sensor inputs without increasing the complexity of the control architecture
2Reliability
If multiple acceleration sensors are used to improve noise cancellation, then the active noise control performance improves, but the installation cost increases
Solution Approach 1:
The patent uses correlation analysis to create a virtual representation of multiple sensor inputs, effectively copying the information value of multiple sensors without requiring physical multiplication of sensor components. This reduces the quantity of actual sensors needed while maintaining performance benefits
Solution Approach 2:
The virtual reference signal serves multiple functions: it consolidates information from multiple acceleration sensors, provides the required correlation data for noise control algorithms, and eliminates the need for additional physical sensors. This multi-functionality reduces both component quantity and installation cost
3Reliability
If a single coherence value is used for active noise control signal calculation, then the system simplicity is maintained, but the noise control effectiveness deteriorates
Solution Approach 1:
The patent generates a virtual reference signal that copies and integrates correlation information from multiple acceleration sensors. This virtual signal provides enhanced coherence information without requiring multiple separate coherence calculations, thereby improving effectiveness while keeping processing complexity manageable
Solution Approach 2:
The patent performs correlation analysis between acceleration sensors and the reference signal in advance to generate the virtual reference signal. This preliminary processing consolidates multiple coherence relationships into a single pre-processed signal, reducing the complexity of real-time noise control calculations while improving effectiveness
Data Source
AI summary
An active noise control method for a vehicle including: acquiring frequency section information corresponding to a current state of the vehicle from a lookup table that has previously stored combination information for each frequency section of a plurality of acceleration sensors for each of state variables of the vehicle; generating a virtual reference signal from reference signals of the plurality of acceleration sensors on the basis of the frequency section information; generating an active noise control signal on the basis of the virtual reference signal and an error signal; and outputting an active noise control sound based on the active noise control signal.