Vehicle Suspension Control Unit Vibration Damping Threshold
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Solution Overview
Problem
Current vehicle suspension systems with electromagnetic motors struggle to effectively damp high-frequency vibrations, leading to reduced ride comfort due to delayed actuation and inadequate damping performance.
Innovation Solution
A suspension system with a control unit that selectively executes vibration damping controls based on vibration intensity, refraining from unnecessary damping in low vibration intensity situations to prevent deterioration of ride comfort and optimize damping performance across various frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If displacement force generators are actuated to damp high-frequency vibrations, then vibration damping performance is improved, but actuation delay occurs and ride comfort deteriorates
Solution Approach 1:
The control unit executes vibration damping control in advance when vibration intensity exceeds the threshold, before the vibration becomes problematic. By monitoring vibration intensity continuously and triggering damping control proactively, the system reduces high-frequency vibrations before they significantly degrade ride comfort, rather than reacting after delay has already occurred.
Solution Approach 2:
The system dynamically adjusts its damping control strategy based on real-time vibration intensity conditions. When vibration intensity exceeds the threshold, full vibration damping control is executed; when it remains below the threshold, the control is refrained from executing. This dynamic adaptation allows the system to optimize between damping performance and actuation response time based on actual operating conditions.
2Reliability
If multiple vibration damping controls are executed concurrently, then comprehensive vibration damping is achieved, but system complexity and computational load increase
Solution Approach 1:
The control unit selectively executes only the necessary vibration damping controls based on current vibration conditions, rather than always executing all available damping controls concurrently. By evaluating vibration intensity against a threshold and refraining from executing damping controls when not needed, the system reduces computational load and control complexity while maintaining effective vibration damping when required.
Solution Approach 2:
The system uses its own vibration sensors and control unit to automatically monitor vibration intensity and determine when damping control is necessary, without requiring external intervention or complex coordinated control. The control unit self-manages the decision-making process for executing damping controls based on real-time feedback from the suspension system's own sensors.
3Reliability
If displacement force is generated continuously, then vibration damping is maintained, but ride comfort deteriorates during low vibration intensity situations
Solution Approach 1:
Instead of continuous displacement force generation, the system employs periodic or conditional activation of the electromagnetic motors based on vibration intensity thresholds. The motors are activated only when vibration intensity exceeds the predetermined threshold and refrained from executing when vibration intensity remains low, creating a periodic rather than continuous operation pattern that maintains damping effectiveness while avoiding ride comfort deterioration during calm conditions.
Solution Approach 2:
The control unit changes the operational parameter of the displacement force generators from continuous operation to threshold-based intermittent operation. By monitoring vibration intensity and adjusting the activation state of the electromagnetic motors based on this parameter, the system optimizes between maintaining vibration damping capability and avoiding unnecessary forces that would degrade ride comfort during low-vibration periods.
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 system effectively dampens vibrations by limiting displacement force generation during high-frequency events, enhancing ride comfort and practicality by ensuring timely actuation and appropriate damping force application.
Implementation Method 1
each of the displacement force generators includes an electromagnetic motor and configured to generate, based on a motor force generated by the electromagnetic motor, a displacement force causing sprung and unsprung portions of the vehicle to be displaced toward or away from each other
Implementation Method 2
each of the displacement force generators is arranged to generate the displacement force as a damping force for damping vibration occurring in the vehicle body
Data Source
AI summary
A suspension system for a vehicle, including (a) four displacement force generators (152) each configured to generate a displacement force forcing sprung and unsprung portions of the vehicle toward or away from each other; and (b) a control unit (200) configured to control the displacement force that is to be generated by each displacement force generator. The control unit is capable of executing a plurality of vibration damping controls concurrently with each other, by controlling the displacement force, so as to damp a composite vibration containing a plurality of different vehicle-body vibrations which are to be damped by the respective vibration damping controls. The control unit is configured to refrain from executing at least one of the vibration damping controls for damping one of the vehicle-body vibrations that is not required to be damped, in a low vibration intensity situation in which intensities of sprung-portion resonance-frequency vibration components in respective four sprung portions of the vehicle are lower than a threshold intensity degree.