Driveshaft Vibration Detection via Frequency Matching in Air Suspension
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Solution Overview
Problem
Vibrations in automotive vehicles, particularly caused by the driveline, can lead to discomfort for occupants and accelerated component wear, potentially resulting in early failure.
Innovation Solution
A system comprising sensors and a controller that convert vibration and angular velocity signals into frequency domains for comparison, diagnosing driveline vibrations, and adjusting the vertical height between the chassis and drive axle to mitigate these vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration detection and analysis system is implemented, then early detection of driveline vibrations is achieved, but device complexity increases
Solution Approach 1:
The controller performs multiple functions: it converts vibration signals to frequency domain, compares frequencies, diagnoses vibration causes, and generates adjustment commands. This multi-functionality consolidates what could be separate systems into a single controller, reducing overall system complexity while maintaining early detection capability
Solution Approach 2:
The system replaces complex mechanical vibration analysis with electronic signal processing. The controller electronically converts time-domain vibration signals into frequency-domain signals and performs automated comparison and diagnosis, substituting what would traditionally require mechanical inspection with an electronic detection system
2Object-affected harmful factors
If vertical height adjustment is implemented to mitigate vibrations, then vibration amplitude is reduced, but device complexity increases
Solution Approach 1:
The system continuously monitors vibration signals, analyzes frequency content, and automatically generates adjustment commands based on detected vibration patterns. This closed-loop feedback mechanism enables automatic vibration mitigation without requiring manual intervention, reducing the complexity of operator training and intervention procedures
Solution Approach 2:
The system dynamically adjusts the vertical height of the driveshaft based on real-time vibration conditions. By making the suspension system adaptive and dynamic rather than static, the system can respond to changing vibration conditions, reducing vibration amplitude across various operating scenarios
3Measurement precision
If frequency domain conversion and comparison is performed, then vibration diagnosis precision is improved, but use of energy increases
Solution Approach 1:
The system performs frequency domain conversion and comparison only when vibration signals are detected above certain thresholds. By applying the full diagnostic process selectively rather than continuously, the system achieves high diagnosis precision when needed while reducing energy consumption during normal operation
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
Early detection and mitigation of driveline vibrations reduce discomfort and prolong component lifespan by addressing the root cause of vibrations.
Implementation Method 1
convert, in the frequency domain, both the one or more first signals and second signals received into respective first and second frequency values
Data Source
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AI summary
System (100) for detecting vibrations in an automotive vehicle (1) which comprises at least a chassis (10), a driveline system which includes a rotating driveshaft (12) and an axle (14), and a suspension system which includes at least one suspension air bellows (20), the system (100) at least comprising, suitable to be mounted on board of the automotive vehicle (1): - a controller (2); - at least one sensor (3, 5) configured to transmit to the controller (2) one or more first signals (SP, SA) indicative of vibrations possibly present onboard the automotive vehicle (1); - at least one speed sensor (4) configured to transmit to the controller (2) one or more second signals (Sv) indicative of values of the angular velocity of the rotating driveshaft (12); wherein the controller (2) is configured to: - convert, in the frequency domain, both the one or more first signals (SP, SA) and second signals (Sv) received into respective first and second frequency values; - compare the first frequency values representing the converted possible vibrations onboard the automotive vehicle (1) with the second frequency values representing the converted angular velocity values of the rotating driveshaft (12); and - diagnose the presence of detected vibrations caused by the driveshaft (12) when at least one of said first frequency values is a harmonic of a corresponding one frequency of said second frequency values.