Active Suspension Control via Electromagnetic Actuator
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Solution Overview
Problem
Vehicles experience undesired motion due to external disturbances, leading to discomfort and potential loss of control, especially for susceptible individuals, and residual vibrations from the engine cause fatigue even when stationary.
Innovation Solution
An active suspension system using an electromagnetic actuator and a control system that modifies control signals based on the difference between the real plant's response and a nominal model, with a force bias eliminator to maintain zero mean load and a fail-safe system to switch between active and passive modes in response to changes or failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an active suspension system is implemented to suppress vibrations and improve comfort, then motion comfort and stability are improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical suspension systems with an electromagnetic actuator-based active suspension system. The electromagnetic actuator directly counteracts vibrations through controlled electromagnetic forces, eliminating the need for complex mechanical springs and dampers while achieving superior vibration suppression and comfort.
Solution Approach 2:
The system dynamically adjusts the electromagnetic actuator parameters (current, frequency, amplitude) based on real-time vibration conditions detected by sensors. This allows the suspension to adapt to different road conditions and vibration frequencies, optimizing comfort while maintaining manageable system complexity through intelligent control rather than mechanical complexity.
2Object-affected harmful factors
If an electromagnetic actuator is used to actively counteract vibrations, then vibration suppression performance is improved, but power consumption increases
Solution Approach 1:
The electromagnetic actuator operates in periodic cycles, activating only when vibration thresholds are exceeded and remaining inactive during calm periods. The system uses sensors to detect vibration events and triggers targeted electromagnetic counter-forces only during these events, rather than continuous operation, thereby reducing overall power consumption while maintaining effective vibration suppression.
Solution Approach 2:
The system detects vibration patterns and applies counter-forces in advance or at the optimal moment to prevent full vibration development. By anticipating vibration events through sensor monitoring and applying preemptive electromagnetic forces, the system achieves effective suppression with shorter actuator activation periods, reducing cumulative power consumption.
3Adaptability or versatility
If a control system continuously monitors and adjusts suspension parameters, then adaptation to changing conditions is improved, but processing requirements and complexity increase
Solution Approach 1:
The control system employs sensor feedback loops that continuously monitor vibration conditions, vehicle state, and road surface characteristics. This real-time feedback enables the system to automatically adjust electromagnetic actuator parameters and suspension characteristics, adapting to changing conditions without requiring complex manual intervention or overly sophisticated control algorithms.
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
Effectively suppresses vibrations and maintains comfort by actively adjusting to disturbances and failures, ensuring stable vehicle operation and reducing motion-related discomfort.
Implementation Method 1
an electromagnetic actuator for exerting a force on the seat
Data Source
AI summary
A method for actively suspending a real plant in a vehicle includes modifying a control signal on the basis of a difference between a property of the real plant, as indicated by the response of the real plant to the control signal, and a property of a nominal plant.