An Overview of Hydraulic Engine<br>Mount Technology in Passenger<br>Vehicle NVH Control<br>1. Introduction<br>In modern passenger vehicle development, ride comfort has become one of the key indicators of<br>overall vehicle quality. Noise, Vibration and Harshness (NVH) performance has a direct impact on<br>driving comfort and the perceived refinement of a vehicle. As one of the main sources of vibration, the<br>engine plays a critical role in NVH behavior, and its vibration control largely depends on the design of<br>the engine mounting system.<br>Engine mounts are not only responsible for supporting and positioning the engine, but also serve as an<br>important barrier that isolates vibration and reduces structure-borne noise. As NVH requirements<br>continue to increase, traditional rubber engine mounts have shown certain limitations under specific<br>operating conditions. As a result, hydraulic engine mounts have been increasingly adopted in<br>passenger vehicles.<br>2. Engine Vibration Characteristics and NVH Issues<br>During operation, the engine continuously generates vibration due to combustion forces, rotational<br>motion, and reciprocating inertia forces. If these vibrations are transmitted directly to the vehicle body,<br>they may cause steering wheel shake, low-frequency cabin noise, and a general reduction in ride<br>comfort.<br>In typical passenger vehicle usage, idle and low-speed conditions are particularly sensitive. At these<br>operating points, vibration excitation is concentrated and vibration amplitudes are relatively high,<br>placing greater demands on the low-frequency isolation capability of the mounting system. Traditional<br>rubber mounts, which rely mainly on material elasticity, often struggle to balance load-bearing<br>stiffness and vibration isolation performance.

3. Working Principle of Hydraulic Engine Mounts<br>Hydraulic engine mounts are composite vibration isolation devices that combine rubber elastic<br>elements with hydraulic damping structures. Their basic principle is to reduce engine vibration by<br>combining rubber deformation with fluid motion.<br>When the engine vibrates, the rubber element deforms first. The internal fluid then flows between<br>chambers through specific passages, creating damping effects that convert vibration energy into heat<br>and dissipate it. Through proper structural design, hydraulic engine mounts can achieve effective<br>damping within targeted frequency ranges.<br>This design gives hydraulic engine mounts a clear advantage in controlling low-frequency vibration,<br>making them particularly effective in improving vibration performance during idle and vehicle launch<br>conditions.<br>4. Advantages of Hydraulic Engine Mounts in Passenger<br>Vehicle NVH<br>First, under idle conditions, hydraulic engine mounts can significantly reduce the transmission of<br>engine vibration to the vehicle body. This helps improve steering wheel feel and cabin comfort, while<br>also enhancing overall vehicle quietness.<br>Second, during dynamic driving conditions such as acceleration and deceleration, hydraulic mounts<br>are able to maintain a good balance between support stiffness and vibration isolation. This allows the<br>mounting system to adapt better to changing operating conditions.<br>In addition, low-frequency vibration is a major contributor to interior noise. By effectively reducing<br>structure-borne vibration, hydraulic engine mounts also help improve the acoustic comfort of the<br>vehicle, resulting in a more refined and balanced driving experience.<br>In practical applications, the performance of hydraulic engine mounts depends heavily on system-level<br>vehicle matching. Mount parameters must be designed in coordination with engine characteristics,<br>body structure stiffness, and overall mounting layout<br>5. Design Considerations in Engineering Applications<br>.<br>Because hydraulic mounts contain fluid and sealing components, higher requirements are placed on<br>durability and reliability. Long-term vibration exposure and harsh environmental conditions make<br>material stability and sealing performance key design concerns.

Compared with conventional rubber mounts, hydraulic engine mounts have a more complex structure.<br>Therefore, cost and weight considerations must also be carefully balanced during vehicle<br>development.<br>6. Development Trends<br>As passenger vehicles continue to pursue higher NVH standards, hydraulic engine mounts are<br>evolving toward improved performance and greater system integration. Structural optimization and<br>material upgrades have led to better durability and consistency. At the same time, with advances in<br>vehicle control technologies, engine mounting systems are gradually moving toward more refined and<br>precise vibration control solutions.<br>7. Conclusion<br>As an important component of passenger vehicle NVH control systems, hydraulic engine mounts<br>effectively address the limitations of traditional engine mounts in low-frequency vibration control by<br>combining rubber elasticity with hydraulic damping. They play a key role in improving idle comfort,<br>reducing interior noise, and enhancing overall vehicle quality.<br>With the continued focus on ride comfort and refinement in passenger vehicles, hydraulic engine<br>mounts and related vibration isolation technologies are expected to maintain steady development in<br>the future.<br>（宽：1555.8 <br>内彩页<br>高：<br>1P<br>2200） ￥52100<br>￥26050<br>￥13025<br>内彩页1\/2P<br>（宽：1555.8 高：1100）<br>内彩页1\/4P<br>（宽：777.9 高：1100）<br>CACP发行78<br>《中国汽配工厂》（CACP）广告价格表<br>个国家及地区的专业汽配展<br>注：年刊的广告有效期为一年

An Overview of Hydraulic Engine<br>Mount Technology in Passenger<br>Vehicle NVH Control<br>1. Introduction<br>In modern passenger vehicle development, ride comfort has become one of the key indicators of<br>overall vehicle quality. Noise, Vibration and Harshness (NVH) performance has a direct impact on<br>driving comfort and the perceived refinement of a vehicle. As one of the main sources of vibration, the<br>engine plays a critical role in NVH behavior, and its vibration control largely depends on the design of<br>the engine mounting system.<br>Engine mounts are not only responsible for supporting and positioning the engine, but also serve as an<br>important barrier that isolates vibration and reduces structure-borne noise. As NVH requirements<br>continue to increase, traditional rubber engine mounts have shown certain limitations under specific<br>operating conditions. As a result, hydraulic engine mounts have been increasingly adopted in<br>passenger vehicles.<br>2. Engine Vibration Characteristics and NVH Issues<br>During operation, the engine continuously generates vibration due to combustion forces, rotational<br>motion, and reciprocating inertia forces. If these vibrations are transmitted directly to the vehicle body,<br>they may cause steering wheel shake, low-frequency cabin noise, and a general reduction in ride<br>comfort.<br>In typical passenger vehicle usage, idle and low-speed conditions are particularly sensitive. At these<br>operating points, vibration excitation is concentrated and vibration amplitudes are relatively high,<br>placing greater demands on the low-frequency isolation capability of the mounting system. Traditional<br>rubber mounts, which rely mainly on material elasticity, often struggle to balance load-bearing<br>stiffness and vibration isolation performance.