Semi-Active Mount Diaphragm Segmentation for Dynamic Response
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Solution Overview
Problem
The electronic indirect by-pass type semi-active mount (EIBP_SAC) faces challenges with low dynamic characteristic change rates due to undesired fluid flow in the primary passage, which affects its performance during vehicle driving and idle conditions.
Innovation Solution
The EIBP_SAC incorporates a primary diaphragm and secondary diaphragm with by-pass channels controlled by a solenoid valve, allowing atmospheric pressure to be managed in two directions to prevent fluid flow, using a solenoid valve to block or allow communication with the atmosphere, thereby maintaining the dynamic characteristic change rate suitable for vehicle driving and idle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the EIBP_SAC uses a solenoid valve to control atmospheric pressure communication with the secondary diaphragm, then the system complexity is reduced and applicability is improved, but the dynamic characteristic change rate decreases due to undesired fluid flow in the primary passage
Solution Approach 1:
The lower fluid chamber is divided into a primary lower fluid chamber and a secondary lower fluid chamber by a primary diaphragm and a secondary diaphragm. This segmentation allows independent control of fluid flow paths, enabling the solenoid valve to selectively communicate atmospheric pressure to the secondary diaphragm without causing undesired flow in the primary passage, thus resolving the contradiction between system simplicity and dynamic response speed.
Solution Approach 2:
A by-pass channel with a solenoid valve is introduced as an intermediary control mechanism. The solenoid valve acts as a mediator that selectively allows atmospheric pressure to communicate with the secondary diaphragm while preventing undesired fluid flow in the primary passage. This intermediary structure enables precise control of dynamic characteristics without sacrificing system simplicity or applicability.
2Device complexity
If the primary diaphragm always communicates with the atmosphere, then the structure is simplified, but the dynamic characteristic change rate is reduced due to simultaneous fluid flow to the primary passage
Solution Approach 1:
The communication with the atmosphere is segmented into two independent paths: the primary diaphragm channel and the secondary diaphragm channel. The primary diaphragm communicates with the atmosphere through the primary lower fluid chamber, while the secondary diaphragm communicates through the by-pass channel controlled by the solenoid valve. This segmentation allows the primary passage to remain simple while preventing undesired fluid flow that would reduce dynamic response speed.
Solution Approach 2:
The system transitions from a static atmospheric communication structure to a dynamic one where the solenoid valve can selectively open or close the by-pass channel. This dynamic control allows the primary diaphragm to always communicate with the atmosphere for structural simplicity, while the secondary diaphragm's communication can be dynamically adjusted to optimize dynamic characteristic change rate by preventing undesired fluid flow in the primary passage.
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 configuration enhances the dynamic characteristic change rate, improving the mount's performance by preventing fluid flow and maintaining optimal conditions for both driving and idle states, similar to the vacuum negative pressure type SAC, while simplifying the system and increasing applicability.
Implementation Method 1
since the EIBP_SAC uses electromagnetic force generated by the vehicle
Implementation Method 2
A solenoid valve generating a small force compared to a vacuum negative pressure is opened or closed such that air outside the secondary diaphragm communicates or does not communicate with the atmosphere
Data Source
AI summary
An electronic indirect by-pass type semi-active mount may include a primary diaphragm dividing a lower fluid chamber, where a fluid in an upper fluid chamber to which an exciting force as external force is applied is circulated, into a primary lower fluid chamber where the fluid is circulated, a secondary diaphragm dividing the lower fluid chamber into a secondary lower fluid chamber where the fluid is circulated, a secondary diaphragm bracket blocking an atmospheric pressure formation peripheral space in which atmospheric pressure acts beneath the primary diaphragm and forming an atmospheric pressure formation central space in which atmospheric pressure acts beneath secondary diaphragm, and by-pass channels.