Variable Air Chamber Engine Mount for Ride-Shake Control
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Solution Overview
Problem
Electronic semi-active control engine mounts with fixed air chambers during vehicle travel experience reduced rate of change of dynamic characteristics and loss factor, leading to deteriorated ride-shake performance, as the air chamber interferes with fluid flow and absorbs external forces, necessitating a trade-off between these factors.
Innovation Solution
A variable air chamber system that forms during engine idling to absorb vibrations and is removed during vehicle travel, allowing fluid flow between upper and lower fluid chambers, utilizing a diaphragm and actuator controlled by a solenoid valve to adjust the air chamber's presence based on engine RPM, thereby enhancing dynamic characteristics and loss factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air chamber is closed during vehicle traveling to maintain dynamic characteristics, then the ride-shake performance deteriorates due to interference with fluid flow and absorption of external forces, but the dynamic characteristics are maintained
Solution Approach 1:
The air chamber is designed to dynamically change its state between closed and open conditions based on vehicle operating conditions. During engine idling, the air chamber remains closed to maintain dynamic characteristics and absorb vibrations. During vehicle traveling, the air chamber is opened to allow fluid flow and improve ride-shake performance. This dynamic state change resolves the contradiction by adapting the air chamber's function to different operational requirements.
2Productivity
If the air chamber is opened during engine idling to improve fluid flow, then the dynamic characteristics change rate increases, but the vibration absorption capability decreases
Solution Approach 1:
The system employs periodic action by controlling the air chamber state based on engine operating conditions. During engine idling periods, the air chamber is closed to absorb vibrations and maintain stability. During vehicle traveling periods, the air chamber is opened to enhance fluid flow and dynamic response. This periodic state change aligned with operational cycles resolves the contradiction between vibration absorption and fluid flow requirements.
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 variable air chamber system improves the rate of change of dynamic characteristics and loss factor to levels comparable to vacuum negative pressure SAC engine mounts, enhancing driving conditions while minimizing design changes and reducing costs, and allowing for a smaller solenoid valve.
Implementation Method 1
a variable air chamber diaphragm that absorbs an exciting force of fluid elastically deforming in which the exciting force occurs due to an external force
Implementation Method 2
The variable air chamber supports the variable air chamber diaphragm with the atmospheric pressure
Implementation Method 3
An actuator either separates the fork from the variable air chamber diaphragm or allows the fork to be in close contact with the variable air chamber diaphragm
Data Source
AI summary
An electronic semi active control engine mount having a variable air chamber includes a variable air chamber diaphragm that absorbs the exciting force of fluid due to an external force by elastically deforming. An air chamber supports the variable air chamber diaphragm with the atmospheric pressure. A fork is separated from the diaphragm to keep the air chamber into which air flows in idling of an engine, and comes in close contact with the variable air chamber diaphragm to remove the air chamber into which the air flows when a vehicle is driven. An actuator either separates the fork from the variable air chamber diaphragm or allows the fork to be in close contact with the variable air chamber diaphragm.