Bidirectional Active Mount Using Coil Electromagnets
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Solution Overview
Problem
Existing engine mounts, particularly those using liquid sealed and air damping technologies, face challenges such as high costs, excessive weight, and limited design freedom, which affect vibration attenuation and fuel efficiency, especially in vehicles equipped with carbon dynamic airbox engines that experience noise, vibration, and harshness (NVH) issues during engine stoppages.
Innovation Solution
An electronic active mount employing two inexpensive coil electromagnets for bidirectional control, which includes a cylindrical core, main rubber, upper and lower fluid chambers, and an air chamber between the electromagnets, allowing for effective vibration attenuation across all frequencies without the need for rare earth permanent magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a liquid sealed mount is used to attenuate vibration, then vibration attenuation performance is improved, but vehicle weight increases and manufacturing cost increases
Solution Approach 1:
The patent uses air damping instead of liquid sealing, employing compressed air in a chamber to provide vibration attenuation. The air chamber with flexible diaphragm creates pneumatic damping effects that replace the liquid-based hydrodynamic damping, reducing weight while maintaining vibration control functionality.
Solution Approach 2:
The patent changes the damping medium from liquid to gas (air), fundamentally altering the physical parameters of the damping system. This parameter change enables bidirectional vibration control capabilities that liquid systems cannot achieve, while also reducing overall system weight and cost.
2Ease of manufacture
If an air damping mount is used to reduce weight and cost, then vehicle weight decreases and manufacturing cost decreases, but design freedom is limited
Solution Approach 1:
The patent introduces active control elements (electromagnets) into the air damping mount, transforming it from a passive to an active system. This enables dynamic adjustment of damping characteristics in real-time, providing adaptability across different operating conditions while maintaining the lightweight air-based structure.
Solution Approach 2:
The air chamber design serves multiple functions: it provides passive air damping, acts as a chamber for active control mechanisms, and enables bidirectional vibration control. This multi-functionality achieves design freedom comparable to liquid systems while maintaining the cost and weight advantages of air damping.
3Use of energy by moving object
If a carbon dynamic airbox engine is used to improve fuel efficiency, then fuel efficiency is improved, but vibration and noise increase during engine stoppages
Solution Approach 1:
The active control system detects vibration trends and applies counteracting forces before excessive vibration occurs during engine stoppages. The electromagnets generate opposing vibrational forces that preemptively counteract the harmful vibrations and noise generated by the CDA engine during cylinder deactivation.
Solution Approach 2:
The system incorporates sensors that continuously monitor vibration levels and provide feedback to the control unit. The controller adjusts electromagnet activation in real-time based on this feedback, enabling dynamic suppression of vibration and noise during engine stoppages while maintaining fuel efficiency benefits.
4Device complexity
If one electromagnet is used for active mounting, then device complexity is reduced, but only unidirectional control is achieved
Solution Approach 1:
The patent divides the active control system into two separate electromagnets positioned to provide bidirectional control. This segmentation allows each electromagnet to handle specific directional control, achieving comprehensive bidirectional capability while keeping individual electromagnet designs relatively simple and manageable.
5Adaptability or versatility
If a permanent magnet is used for bidirectional control, then bidirectional vibration control is achieved, but cost increases and weight increases
Solution Approach 1:
The patent replaces the permanent magnet-based electric active mounting system with an all-electromagnetic system. This substitution eliminates the need for expensive and heavy rare earth permanent magnets, achieving bidirectional control through two coil electromagnets driven by electronic control, thereby reducing both cost and weight while maintaining control functionality.
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
This solution achieves bidirectional vibration control, maximizing NVH performance, reducing production costs, and improving fuel efficiency by using coil electromagnets instead of heavy and costly permanent magnets, while maintaining performance comparable to electric active mounts, even when the carbon dynamic airbox engine is turned off.
Implementation Method 1
an upper electromagnet and a lower electromagnet respectively disposed at the upper membrane and the lower housing
Implementation Method 2
an air chamber which is a space between a lower end surface of the membrane and an upper end surface of the lower housing so as to accommodate air
Implementation Method 3
an upper fluid chamber capable of accommodating a fluid, and having a central portion to which a membrane is coupled to be moved in an up and down direction
Data Source
AI summary
An electronic active mount capable of a bidirectional control includes a core positioned inside a housing and connected to an engine. A main rubber is configured to connect the core and the housing. An upper orifice is coupled to an end of the main rubber to form an upper fluid chamber. A membrane is coupled to be moved up and down is connected to a lower orifice. A lower housing is formed at a central portion of the lower orifice, and a diaphragm is spaced apart from the lower orifice at a predetermined distance, which may attenuate vibration by using two electromagnets provided in an electronic mount.