Active Hydro Motor Mounts
Neutralize incoming vibrations and reduce noise by up to 20dB
Noise reduction of over 20dB under partial load conditions
Integration of ECU into the vehicle software environment
Active adjustment of dynamic stiffness of the mount
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. Active motor mount systems from Vibracoustic solve this conflict by applying electronically generated compensation movements to neutralize the incoming vibrations and reduce noise by up to 20dB.
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.
When low frequency, high amplitude road excitations occur, the active hydro mount functions as a conventional mount and an oscillation of the engine is damped by the movement of the liquid. When high frequency, low amplitude engine excitations occur, from idle to full load operations, the conventional hydro mount can no longer follow the quick movement due to the inertia of the fluid. Here the active function of the hydro mount comes into play. It can operate the actuator up and down to control the inside pressure of the fluid and therewith adjust the dynamic stiffness of the mount, enhancing the vibration isolation performance while driving.
The active hydraulic motor mounts can work in a frequency range of 20-200 Hz and the generated compensation movements can lead to a noise reduction of up to 20dB under partial load conditions and a reduction of up to 15dB under full load conditions, which is a clearly noticeable difference 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.
