Downsizing and cylinder deactivation help to reduce fuel consumption and CO2 emissions. Nevertheless, engines with fewer cylinders generate more vibrations, as the time intervals between the ignitions are longer. Activating and deactivating cylinders also produces vibrations. Because conventional dampers work passively, they are not always able to eliminate these types of disturbances. Active Vibration Control (AVC) from Vibracoustic detects and tackles these types of vibrations on an individual and specific basis.
The basic principle of AVC lies in neutralizing incoming sinewave vibrations by using specially generated counter-vibrations. These counter-vibrations are set at the same frequency and amplitude and work through their opposite phase. An input sensor, such as a microphone or accelerometer, measures the vibrations perceived in the vehicle and reports the data to an electronic control unit. The electronic control unit processes the input signals on an ongoing basis and determines the counter-vibration which is then generated by an electrodynamic actuator. The result is then measured by the input sensor and processed again.
Vibracoustic thus offers a situational and pinpoint system that detects and neutralizes disruptive vibrations. It can even solve vibration control problems in the late developmental stage of a vehicle.