Electromagnetic Suspension Damper With Direction-Dependent Damping
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Solution Overview
Problem
Existing suspension systems in vehicles apply equal resistance to both compressive and rebound forces, failing to differentiate between these forces, which is undesirable for optimal vehicle performance.
Innovation Solution
A suspension system with a rectifier circuit that adjusts impedance based on the direction of rotation of the rotor, providing asymmetrical damping forces by using a logic circuit to control circuit switches and apply different resistive forces in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If equal resistance is applied to both compressive and rebound forces, then the suspension system is simple to operate, but the vehicle performance is suboptimal because the rebound force should be greater than the compressive force
Solution Approach 1:
The damper system dynamically adjusts its damping characteristics based on the direction of motion. The system transitions from a static equal-resistance configuration to a dynamic asymmetric configuration where rebound damping exceeds compression damping, allowing optimal performance while maintaining operational simplicity through automatic direction-based adjustment
Solution Approach 2:
The system changes the damping parameter (resistance force) based on the direction of rotor rotation. By detecting rotation direction and adjusting the damping coefficient accordingly - higher for rebound motions and lower for compression motions - the system achieves superior vehicle performance without complex manual intervention
2Productivity
If asymmetrical damping forces are applied to differentiate between compressive and rebound forces, then the vehicle performance is improved, but the device complexity increases due to the rectifier circuit and logic control
Solution Approach 1:
The patent replaces complex mechanical asymmetric damping mechanisms with an electromagnetic approach. A rectifier circuit converts AC voltage to DC voltage, and logic circuits control switches to adjust damping asymmetrically, substituting mechanical complexity with more manageable electrical control systems that achieve the same performance goal
Solution Approach 2:
The rectifier circuit and logic control circuits serve as intermediaries between the rotor motion and the damping force application. These intermediary components translate rotational direction into appropriate damping resistance, simplifying the overall control architecture while achieving asymmetric damping performance
3Force
If the rectifier circuit adjusts impedance based on rotation direction, then the damping force becomes asymmetrical, but the manufacturing precision requirements increase for the circuit components
Solution Approach 1:
The system changes electrical parameters (impedance, resistance) of the rectifier circuit based on rotation direction detected by the logic circuit. By using standard electronic components with commercially available tolerances and adjusting their configuration through software-controlled switches, the system achieves precise asymmetrical damping forces without requiring ultra-precision manufacturing
4Force
If different impedances are placed in the rectifier circuit based on rotation direction, then the damping resistance is optimized for each direction, but the loss of time increases due to the switching operations
Solution Approach 1:
The damping force adjustment operates continuously as the rotor rotates, with the logic circuit and rectifier circuit dynamically adjusting impedance in real-time based on instantaneous rotation direction. This continuous adjustment eliminates dead zones or delays where optimal damping is not applied, minimizing time loss while maintaining optimized resistance throughout the operational cycle
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 generates distinct damping forces for compressive and rebound motions, enhancing vehicle stability and performance by tailoring resistance to the specific demands of each force direction.
Implementation Method 1
The rotary motor is configured to generate a current based on a direction of rotation of the rotary motor
Data Source
AI summary
A vehicle, suspension system of the vehicle and method of operating the suspension system is disclosed. The suspension system includes a rotary motor, a rectifier circuit and a logic circuit. The rotary motor is configured to generate a current based on a direction of rotation of the rotary motor. The rectifier circuit is configured to applying a damping force against the rotation at the rotary motor based on an impedance. The logic circuit changes the impedance of the rectifier circuit based on the direction of rotation of the rotary motor.