Active Suspension Damping Control for Pothole Impact Reduction
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Solution Overview
Problem
Active vehicle suspension systems face challenges in maintaining optimal ride comfort by balancing damping levels, as low damping allows deep wheel penetration into potholes, increasing impact forces, while high damping worsens ride quality on smooth roads.
Innovation Solution
A method and system that dynamically adjust damping levels based on vertical wheel velocity and time thresholds, with thresholds varying by vehicle speed, to incrementally increase damping only when encountering potholes, thereby minimizing impact forces while preserving ride quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the damping level is kept low to maintain ride comfort on smooth roads, then ride quality is improved, but the wheel penetrates deeper into potholes increasing impact forces
Solution Approach 1:
The damping level is made dynamically adjustable rather than fixed. The system continuously monitors wheel vertical velocity and automatically adjusts damping levels in real-time based on road conditions, transitioning from low damping on smooth roads to high damping when potholes are detected
Solution Approach 2:
The damping parameter is changed based on detected wheel velocity. When the wheel vertical velocity exceeds a threshold indicating pothole encounter, the damping level is increased to reduce impact forces, and returned to normal when the threshold is no longer exceeded
2Force
If the damping level is increased to reduce impact forces from potholes, then impact forces are reduced, but ride quality deteriorates on smooth roads
Solution Approach 1:
The damping level is dynamically adjusted based on real-time wheel velocity measurements. The system maintains low damping for normal ride comfort and only increases damping when pothole conditions are detected through velocity threshold exceedance
Solution Approach 2:
The system uses feedback from wheel vertical velocity sensing to control damping adjustments. When velocity exceeds the threshold, damping is increased; when it returns below the threshold, damping is reduced, creating a closed-loop control system that responds to actual road conditions
3Force
If damping is increased rapidly when a pothole is detected, then impact forces are reduced, but sudden shifts in damping pressure adversely affect ride quality
Solution Approach 1:
The damping adjustment is made periodic rather than instantaneous. The system monitors wheel velocity continuously and adjusts damping in response to sustained threshold exceedance, creating a rhythmic adjustment pattern that reduces sudden pressure shifts
Solution Approach 2:
The damping system transitions smoothly between states based on velocity threshold monitoring. By using continuous velocity measurement and threshold-based control, the system dynamically adjusts damping levels to reduce impact forces while minimizing abrupt changes that would affect ride quality
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 solution effectively reduces impact forces during pothole encounters while maintaining low damping for smooth road conditions, enhancing ride comfort and minimizing sudden shifts in damping pressure, thus improving overall ride quality.
Implementation Method 1
the greater the impact forces generated by the wheel impacting a far side of the hole just prior to rising out of the hole
Data Source
AI summary
An active vehicle suspension system includes an active damping mechanism operatively coupled to a vehicle wheel and configured for controlling a damping force applied to the wheel responsive to a control signal. A controller is operatively coupled to the damping mechanism and configured for generating a control signal to the damping mechanism responsive to velocity of the wheel in a downward vertical direction. At least one of a timer threshold and velocity threshold, used to determine whether a vehicle wheel has encountered a depression in a road surface, may be varied on a basis of a speed of the vehicle. A damping mechanism for a rear wheel of a vehicle may be controlled on a basis of how a damping mechanism for a front wheel is controlled.