Vibration control of an automotive engine using active mounts

In this research, vibration control of national engine (EF7) using active mounts is studied for two different mounting layouts. The first layout is based on the current engine mounting of national engine (system of three passive mounts), but the hydraulic mount is substituted by an active mount. The other mounting layout contains 4 mounts, 2 of which are active ones and the others are passive mounts. In order to simulate the dynamic behavior of the engine, a 6-degree-of-freedom, one-way-coupled model is hired. In addition, a proper dynamic model for active mount with electromagnetic actuator is chosen. In order to reduce transmitted force to the chassis through the mounting system, a feed-forward adaptive control method, FXLMS (Filtered-x Least Mean Squares) is employed which is one of the widely used methods in cancellation of acoustical and vibrational noises. Considering the characteristics of the transmitted force to the chassis, this method is used in a specific algorithm called narrow-band algorithm to cancel dominant harmonic frequency of the unwanted vibrations of the engine.