Active Valve Damping for Gravel Road Detection
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Solution Overview
Problem
Existing vehicle suspension systems struggle to seamlessly transition between different terrain types, often resulting in compromised ride comfort and performance, particularly on surfaces like gravel roads where the suspension may incorrectly switch to a softer setting due to high acceleration readings from small bumps.
Innovation Solution
The implementation of an active valve system integrated with sensors to detect terrain type and adjust suspension settings accordingly, using a combination of accelerometer data and power spectral density analysis to differentiate between smooth and rough terrain, and employing a noise floor adjustment mechanism to prevent false triggers on surfaces like gravel roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the suspension system uses a softer setting to improve ride comfort on rough terrain, then ride comfort is improved, but vehicle performance and handling deteriorate on smooth terrain
Solution Approach 1:
The suspension system dynamically adjusts its damping characteristics in real-time based on terrain detection. The system transitions from a static suspension setup to a dynamic one that can modify its properties during operation, allowing it to optimize between comfort and performance based on current terrain conditions.
Solution Approach 2:
The system changes the physical parameters of the suspension (damping coefficients, spring rates) based on detected terrain type. By analyzing accelerometer data and power spectral density, the system identifies terrain characteristics and adjusts suspension parameters accordingly to achieve optimal performance for each terrain type.
2Object-affected harmful factors
If the suspension system switches to a softer setting based on high acceleration readings, then ride comfort on rough terrain is improved, but false triggers on gravel roads cause unnecessary suspension changes and compromised performance
Solution Approach 1:
The system uses feedback from multiple sensors (accelerometers) and processes the data through power spectral density analysis to distinguish between true rough terrain and false conditions like gravel roads. The feedback loop continuously monitors acceleration patterns and adjusts suspension settings only when terrain type is confidently identified.
Solution Approach 2:
The system adds another dimension to terrain detection by analyzing not just the magnitude of acceleration but also its frequency characteristics through power spectral density. This transforms the detection from a single-parameter threshold check to a multi-dimensional analysis that can differentiate between similar vibration patterns caused by different terrain types.
3Productivity
If the suspension system maintains a firmer setting to improve vehicle performance on smooth terrain, then vehicle performance is improved, but ride comfort on rough terrain deteriorates
Solution Approach 1:
The suspension system transitions from a static firm setting to a dynamic configuration that softens automatically when rough terrain is detected. This allows the system to maintain optimal performance on smooth roads while providing enhanced comfort when terrain conditions require it.
Solution Approach 2:
The system modifies suspension parameters (damping coefficients, stiffness) based on real-time terrain analysis. When power spectral density analysis indicates rough terrain, the system increases damping and softens the suspension to improve comfort, then returns to firmer settings when smooth terrain is detected to optimize performance.
4Adaptability or versatility
If the suspension system frequently adjusts settings to adapt to varying terrain, then adaptability is improved, but system complexity and response time deteriorate due to processing requirements
Solution Approach 1:
The system replaces complex mechanical terrain sensing mechanisms with electronic sensors (accelerometers) and computational analysis (power spectral density). This substitution reduces mechanical complexity while enhancing the ability to detect and adapt to various terrain types through software-based analysis.
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
This solution enables the suspension system to accurately adapt to various terrain conditions, enhancing both ride comfort and performance by minimizing unnecessary suspension changes, thus providing a more stable and efficient driving experience.
Implementation Method 1
sensor data from a plurality of sensors including an accelerometer
Implementation Method 2
a spring component or components and a damping component or components that form a suspension
Data Source
AI summary
A rough road detection system is disclosed. The system includes a sensor data receiver to receive sensor data from one or more sensors monitoring a vehicle. A sensor data evaluator to: identify a repeating pattern in the sensor data, the repeating pattern indicative of a terrain type being traversed by the vehicle, determine a value of the repeating pattern, obtain a present set of operational values for at least one damping characteristic of an active valve damper coupled with the vehicle, and modify the present set of operational values for the at least one damping characteristic of the active valve damper based on the value of the repeating pattern to develop a modified set of operational values for the at least one damping characteristic of the active valve damper.