Semi-Active Engine Mount Using Magnetic Closure for NVH Control
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Solution Overview
Problem
Current semi-active engine mounts face challenges in balancing dynamic characteristics and loss factor, leading to increased costs, weight, and complex structures, while struggling to effectively improve NVH performance and ride quality due to conflicting properties.
Innovation Solution
A semi-active engine mount design incorporating a rubber module, fluid module with a closure and diaphragm, and a coil module that adjusts the closure's position using a magnetic field, allowing for reduced dynamic characteristics when idling and increased loss factor during driving, while minimizing component count and maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coil having high capacity that corresponds to rigidity of a rubber spring is applied in the current semi-active mount, then the dynamic characteristics can be adjusted, but costs and weights are greatly increased
Solution Approach 1:
The patent replaces the traditional high-capacity coil spring mechanism with a magnetic field-based closure system. The closure opens or closes the bypass flow path through electromagnetic actuation rather than mechanical spring force, eliminating the need for heavy coil springs while maintaining the ability to adjust dynamic characteristics.
Solution Approach 2:
The invention uses a fluid-based damping mechanism where a closure controls the bypass flow path of damping fluid. By opening or closing this flow path, the system adjusts its dynamic characteristics hydraulically, replacing the need for mechanical spring systems with a more lightweight fluid control approach.
2Adaptability or versatility
If a coil having high capacity that corresponds to rigidity of a rubber spring is applied in the current semi-active mount, then the dynamic characteristics can be adjusted, but the structure becomes complex
Solution Approach 1:
The patent integrates the closure mechanism directly into the existing hydraulic mount structure. The closure, bypass flow path, and damping chambers are merged into a unified design where the closure is positioned within the module case to directly control fluid flow, eliminating the need for separate coil spring assemblies and reducing overall structural complexity.
Solution Approach 2:
The invention extracts and removes the complex coil spring system from the traditional semi-active mount design. By eliminating the high-capacity coil springs and their associated mounting structures, the patent simplifies the overall assembly while retaining the essential function of dynamic characteristic adjustment through the closure mechanism.
3Ease of operation
If the current semi-active mount is used, then dynamic characteristics can be decreased when the vehicle idles, but the size is greater than that of the existing hydraulic mount
Solution Approach 1:
The patent implements a dynamic control mechanism where the closure can switch between open and closed states of the bypass flow path. When the vehicle idles, the closure opens the bypass path to decrease dynamic characteristics and reduce idle vibration. During driving, the closure closes the bypass path to increase damping. This dynamic switching allows the mount to adapt its size-effective characteristics based on operating conditions.
Solution Approach 2:
The closure mechanism is nested within the module case structure, with the closure positioned inside the hydraulic mount assembly. The bypass flow path is integrated into the existing chamber structure, allowing the control mechanism to be contained within the same volume as the traditional hydraulic mount, thereby maintaining compact dimensions.
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 engine mount improves NVH performance and ride quality by dynamically adjusting characteristics, reduces costs and weight through a simplified structure, and maintains compatibility with existing hydraulic mounts in terms of size and packaging.
Implementation Method 1
a coil module with a coil embedded in the fluid module and configured to adjust the position (e.g., open or close) of the closure as a power source is turned on or off
Implementation Method 2
a coil module with a coil embedded in the fluid module and configured to adjust the position (e.g., open or close) of the closure as a power source is turned on or off
Implementation Method 3
a rubber module which includes a rubber having a core therein
Implementation Method 4
a rubber module which includes a rubber having a core therein
Implementation Method 5
a fluid module which includes a module case coupled to the rubber module to define an upper chamber and a lower chamber and having a straight flow path and a bypass flow path
Data Source
AI summary
A semi-active engine mount for a vehicle is provided to improve the NVH performance and ride quality. An engine mount for a vehicle includes a rubber module with a rubber having a core therein, and a case that surrounds an exterior circumference of the rubber and a fluid module with a module case coupled to the rubber module to define an upper and lower chamber and having straight and a bypass flow paths, a closure configured to open or close the straight flow path, and a diaphragm installed on the module case to close the lower chamber. A coil module has a coil embedded in the fluid module and configured to open and close the closure when a power source is turned on or off. In particular, a high loss factor when the vehicle travels is reduced, and decreasing dynamic characteristics when the vehicle idles is decreased.