Systems   |  Motor Mount Systems

Detect and Neutralize Disruptive Vibrations

Engine and motor mounts carry the static and dynamic loads and isolate vibrations from low to high frequencies. To achieve the best NVH performance and provide a comfortable and smooth ride experience for all passengers, the mounts and torque rods need to be precisely tuned and adapted to the specific requirements.

With our proprietary motor mount system simulation, we can configure, simulate, benchmark and fine-tune the interaction of the different system components, with each other and with the surrounding vehicle structures, without changing the DNA of the specific vehicle. Furthermore, we can verify the results on our own vehicle and component test rigs.

To reduce fuel consumption and CO2 emissions, the industry relies on downsizing, cylinder deactivation and higher combustion pressures for combustions engines. However, this causes more engine vibrations as the time intervals between the ignitions are longer. Since conventional mounts work passively, they are not always able to eliminate these types of disturbances.

Active motor mount systems use specially generated compensation movements to neutralize the incoming engine vibrations. The basic principle lies in neutralizing incoming sine wave vibrations by applying electrically generated compensation movements. These compensation movements are set at the same frequency. The appropriate setting of the phase position prevents the vibrations being transferred into the chassis and felt inside the cabin, which ultimately increases the driving comfort for the passengers.

Active motor mount systems consist of a hydraulic motor mount with an actuator, an analog acceleration sensor and an electronic control unit (ECU). Whereas the acceleration sensor measures the excitations coming from the engine, the ECU calculates in real-time the needed compensation movements and sends them to the actuator within the active hydro mount to cancel out the incoming vibrations.

As a leading NVH expert for the automotive industry, Vibracoustic is able to develop active hydro mounts including dedicated simulation tools and verification with component, subsystem and vehicle tests. Vibracoustic is also able to realize the software integration of the ECU into the vehicle software environment. 

Active Hydro Motor Mount
Acceleration Sensor
Electronic Control Unit (ECU)

Active motor mount systems are most commonly used in three- and four-point longitudinal installation but are also applicable to pendulum or central mounting systems, depending on transfer path analysis and direction of highest excitation. The benefits from active vibration control can also be applied to high frequency hybrid and electric motors.