Active Engine Mounting Valve Unit for NVH Control
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Solution Overview
Problem
Existing active engine mounting devices face challenges in balancing noise, vibration, and handling (NVH) performance due to increased weight and size from solenoid valves, and require separate controllers, leading to higher costs and reduced dynamic characteristics.
Innovation Solution
An active engine mounting device with a valve unit that selectively passes fluid through three channels using a linear step motor to adjust vibration and load inputs based on driving conditions, incorporating an upper and lower liquid chamber, insulator, diaphragm, and valve unit with multiple channels to optimize NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a solenoid valve is added to control dynamic characteristics, then the ability to adjust vibration attenuation is improved, but the weight and size of the device increase
Solution Approach 1:
The patent extracts the solenoid valve from the system and replaces it with a simpler valve mechanism that can be directly actuated by a linear step motor, eliminating the need for the solenoid valve while maintaining dynamic characteristics control capability
Solution Approach 2:
The patent replaces the electromagnetic solenoid valve with a mechanically actuated valve system using a linear step motor, simplifying the overall mechanical structure and reducing weight while preserving the ability to control fluid flow and adjust dynamic characteristics
2Adaptability or versatility
If a solenoid valve is added to control dynamic characteristics, then the ability to adjust vibration attenuation is improved, but the device complexity increases
Solution Approach 1:
The patent merges the valve actuation function directly into the valve assembly itself, using a linear step motor that integrates with the valve mechanism, thereby reducing the need for separate controllers and logic circuits while maintaining dynamic characteristics control
Solution Approach 2:
The valve unit is designed to perform multiple functions: it can selectively pass fluid through different channels (first, second, and third channels) to control both NVH performance and ride and handling performance, eliminating the need for complex separate control systems
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 device effectively attenuates vibrations and loads by selectively opening and closing channels in response to driving conditions, improving NVH and R&H performance while reducing the need for additional controllers and minimizing weight and size.
Implementation Method 1
an insulator that encloses a core integrally formed with a mounting bolt and elastically deformed based on the load applied to the core
Implementation Method 2
a hydraulic mounting device configured to fill a predetermined amount of fluid... The hydraulic mounting device has a fluid filled therein and attenuates vibrations using a flow of the fluid
Data Source
AI summary
An active engine mounting device is provided. The active engine mounting device includes upper and lower liquid chambers partitioned by a valve unit and adjusts a vibration and a load input from an engine in response to a driving condition while a fluid passes through the valve unit and attenuates the vibration and the load. The active engine mounting device includes an insulator that encloses a core integrally formed with a mounting bolt and elastically deformed based on the load applied to the core. A main case is disposed at a circumference of a lower end portion of the insulator. A diaphragm is disposed under the main case. The valve unit is configured to selectively pass the fluid through three channels based on operation of the valve. An actuator is disposed through an auxiliary case to drive the valve in an axial direction.