Hydraulic Engine Mount with Dual Channels and Solenoid Control
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Solution Overview
Problem
Conventional hydraulic engine mounts cannot effectively reduce vibrations in different driving states with large frequency differences, particularly failing to achieve peak damping frequencies in ignition mode (7∼8Hz) and rough road driving mode (11∼13Hz), due to their single fluid-moving channel design which limits dynamic stiffness variation.
Innovation Solution
A hydraulic engine mount with two fluid-moving channels and a solenoid device that controls the opening and closing of both channels and an air chamber, allowing for dynamic stiffness adjustment to achieve peak damping at specific frequency ranges by operating the solenoid device to open or close the second channel and air chamber simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fluid-moving channel is used in the conventional engine mount, then the device complexity is reduced, but the adaptability to different driving states with large frequency differences is insufficient
Solution Approach 1:
The single fluid-moving channel is segmented into two separate channels (first channel and second channel) with different characteristics. The first channel has a larger flow area for low-frequency vibration damping, while the second channel has a smaller flow area for high-frequency vibration damping. This segmentation allows the engine mount to adapt to different driving states by selectively opening or closing specific channels based on the vibration frequency range.
2Adaptability or versatility
If the peak damping frequency is set to fixed values (e.g., 8Hz and 10Hz or 9Hz and 11Hz), then the manufacturing precision is simplified, but the adaptability to accurately tune to ignition mode (7∼8Hz) and rough road driving mode (11∼13Hz) frequencies is compromised
Solution Approach 1:
The engine mount transitions from a static, fixed peak damping frequency design to a dynamic configuration where the peak damping frequency can be adjusted by opening or closing different channels. The solenoid valve enables dynamic switching between channels based on the detected vibration frequency, allowing the system to accurately tune to the ignition mode (7∼8Hz) and rough road driving mode (11∼13Hz) frequencies as needed.
3Ease of manufacture
If only one fluid-moving channel is used, then the ease of manufacture is improved, but the ability to reduce vibration efficiently in both ignition mode and rough road driving mode is decreased
Solution Approach 1:
The vibration reduction function is segmented into two specialized channels: the first channel optimized for ignition mode vibration reduction (7∼8Hz) with larger flow area, and the second channel optimized for rough road driving mode vibration reduction (11∼13Hz) with smaller flow area. This segmentation enables efficient vibration reduction in both driving modes simultaneously, overcoming the limitation of a single-channel design.
4Adaptability or versatility
If the dynamic stiffness is changed by completely closing and opening upper and lower fluid chambers through a single path, then the device complexity is reduced, but the ability to achieve peak damping according to various frequency ranges is limited
Solution Approach 1:
The fluid chamber connection path is segmented into two separate channels with different flow characteristics. The first channel provides a larger flow area for low-frequency peak damping, while the second channel provides a smaller flow area for high-frequency peak damping. This segmentation allows the system to achieve peak damping across various frequency ranges by selectively activating the appropriate channel.
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 engine mount effectively reduces vibrations in both ignition and rough road driving modes by varying peak damping frequencies, improving noise, vibration, and harshness (NVH) performance, with a larger change in peak damping frequency compared to conventional designs, and maintaining low manufacturing costs.
Implementation Method 1
a solenoid device installed in the housing and having a first solenoid valve body for opening and closing the second channel
Implementation Method 2
a housing sealed with liquid at a lower portion of a rubber elastic body performing a first shock-absorbing function
Implementation Method 3
a rubber elastic body performing a first shock-absorbing function
Data Source
Figure 1
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AI summary
A hydraulic engine mount with two channels (100) is provided, which reduces vibration effectively in ignition mode and rough road mode, improves performance in noise, vibration, harshness (NVH) in a vehicle with stop/start function. The hydraulic engine mount with two channels (100), provided with a dividing means (130), comprises a first channel formed along a first path of the dividing means (130) and providing a moving path of fluid between an upper fluid chamber and a lower fluid chamber, a second channel (C2) formed along a second path of the dividing means (130) and providing a moving path of fluid between the upper fluid chamber and the lower fluid chamber, and a solenoid device (160) having a first solenoid valve body installed in the housing (150) and configured for opening and closing the second channel (C2).