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Here's how an active engine mount works to dampen a car's engine vibration.


Engine mounts provide support for the engine on the subframe, and isolate vibration going into the cabin for passenger comfort. They also help maintain other components from wearing out through vibration, such as the exhaust system.


An active engine mount is typically vacuum controlled and filled with hydraulic fluid. Vacuum pressure is applied through a switching valve controlled by the ECU. A diaphragm inside moves, causing a pressure change in the hydraulic chamber. The amount of fluid in the chambers determines the resonating frequency that is allowed to perpetuate from the vibrating engine to the subframe, and thus be felt by passengers.



The ECU determines a set range of pulses to send to the switching valve according to RPM, based on engine tuning. In this video, an active engine mount from a 1999 Lexus ES300 is cut apart to see what's inside and how it works. A practical demonstration follows, with a cup of water resting on the car's frame as the active mount option is cycled on and off.


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