Active Noise Control Failure Diagnosis Using Stationary And Driving Tests
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Solution Overview
Problem
Existing active noise control systems in vehicles face challenges in identifying normal operation due to issues with sensor failures or wire short-circuits, making it difficult to determine if the system is functioning correctly, especially when the vehicle is in motion.
Innovation Solution
A method involving the measurement and comparison of sound wave transmission functions before and during vehicle operation, using sensors, microphones, and speakers to diagnose system failures, allowing for normal operation assessment while stationary or traveling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wire connects the controller to sensors and microphones, then the system structure is simple, but it becomes impossible to identify whether the system operates normally when a sensor fails or the wire is short-circuited
Solution Approach 1:
The patent divides the single wire connection into multiple independent communication channels, with each sensor and microphone having its own dedicated communication path to the controller. This segmentation allows independent monitoring of each component's status, enabling failure identification while maintaining overall system structure simplicity.
Solution Approach 2:
The patent implements a feedback mechanism where sensors and microphones send status information back to the controller through the communication channels. The controller receives feedback signals that indicate whether each component is functioning normally, allowing real-time monitoring and failure detection without increasing system complexity.
2Ease of operation
If state check messages are transmitted through all sensors placed between the controller and corresponding sensors, then the communication path is established, but it becomes impossible to identify system normal operation when any one sensor fails or the wire is short-circuited
Solution Approach 1:
The patent segments the communication path into multiple independent channels, eliminating the need for messages to pass through all sensors. Each sensor communicates directly with the controller through its own channel, allowing independent failure detection without affecting other components.
Solution Approach 2:
The patent introduces dedicated communication channels as intermediaries between the controller and sensors/microphones. These channels provide direct communication paths that bypass other sensors, enabling reliable status monitoring and failure detection without requiring messages to traverse the entire sensor chain.
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
Enables accurate identification of system failures and normal operation of active noise control systems, ensuring effective noise reduction and user notification of system status.
Implementation Method 1
a sensor part including a plurality of sensors mounted on axles of wheels of a vehicle and configured to detect ground surface vibration
Implementation Method 2
a microphone part including a plurality of microphones respectively mounted in seats of the vehicle and configured to measure noise
Implementation Method 3
it is possible to effectively reduce noise while equally maintaining a vehicle body weight
Data Source
AI summary
A method of diagnosing a failure of an active noise control system of the present invention may receive a sound wave transmission function A and a sound wave transmission function A′from a controller, measure a sound wave transmission function a while a vehicle is stationary and a sound wave transmission function a′ while the vehicle travels, determine whether an active noise control system operates normally on the basis of similarity between a and A and similarity between a′ and A′, and notify a user of a failure state of the active noise control system when the active noise control system is determined as not operating normally.