Active Engine Mount with Electromagnetic Bypass Valve
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Solution Overview
Problem
Existing engine mounts, whether made of rubber or fluid encapsulated, fail to effectively manage both high-frequency micro amplitude and low-frequency large displacement vibrations and noise, leading to inadequate NVH performance, especially in diesel engines where dynamic characteristics are compromised.
Innovation Solution
An active engine mount system incorporating an elongated orifice and a bypass unit with an electromagnet-controlled switching valve and air chamber, optimizing spatial utilization and loss factor by positioning the inlet of an elongated nozzle at the central portion of the upper liquid chamber, allowing for improved dynamic characteristics and vibration isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If vacuum pressure is used in bypass mount, then layout is simplified, but combustion back pressure deteriorates
Solution Approach 1:
The invention extracts the vacuum pressure system from the bypass mount by providing a separate vacuum source (intake manifold vacuum) that does not interfere with the combustion chamber. The vacuum is applied only to the upper liquid chamber for damping control, while the bypass mount uses this vacuum independently, thus eliminating the harmful back pressure effect while maintaining layout simplicity.
2Volume of moving object
If an elongated orifice is positioned at the central portion of the upper liquid chamber, then spatial utilization is maximized, but manufacturing complexity increases
Solution Approach 1:
The elongated orifice is strategically positioned at the central portion of the upper liquid chamber where the largest volume pressure is applied. This localized placement optimizes the damping effect in the most critical area, maximizing spatial utilization and performance while keeping the overall structure relatively simple for manufacturing.
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 active engine mount enhances vibration isolation at high frequencies, reduces excitation vibrations and penetration sounds, and provides greater tuning flexibility while maintaining combustion pressure integrity, improving NVH performance across a broader frequency range.
Implementation Method 1
operates an electromagnet
Implementation Method 2
absorbs and damps all vibration over widespread ranges
Implementation Method 3
an orifice through which a fluid flow between the upper and lower liquid chambers
Implementation Method 4
an engine mount that is made of a rubber material having predetermined elasticity
Implementation Method 5
exhibits excellent performance in absorbing and damping vibration with micro amplitude at a high frequency
Implementation Method 6
provides greater tuning flexibility while maintaining combustion pressure integrity
Data Source
AI summary
An active engine mount for a vehicle includes an upper body which has a main rubber and an upper liquid chamber, and a lower body which is coupled to a lower portion of the upper body. An orifice circular plate divides an interior of the upper and lower bodies into the upper liquid chamber and a lower liquid chamber inside the upper and lower bodies, and has an orifice through which a fluid flows between the upper and lower liquid chambers. A diaphragm is installed below the orifice circular plate inside the upper and lower bodies, and forms the lower liquid chamber. A semi-active mount is in contact with a central portion of the diaphragm by a plunger inside the lower body, and operates by an electromagnet.